net/core/filter.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Linux Socket Filter - Kernel level socket filtering
   4  *
   5  * Based on the design of the Berkeley Packet Filter. The new
   6  * internal format has been designed by PLUMgrid:
   7  *
   8  *      Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com
   9  *
  10  * Authors:
  11  *
  12  *      Jay Schulist <jschlst@samba.org>
  13  *      Alexei Starovoitov <ast@plumgrid.com>
  14  *      Daniel Borkmann <dborkman@redhat.com>
  15  *
  16  * Andi Kleen - Fix a few bad bugs and races.
  17  * Kris Katterjohn - Added many additional checks in bpf_check_classic()
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/mm.h>
  23 #include <linux/fcntl.h>
  24 #include <linux/socket.h>
  25 #include <linux/sock_diag.h>
  26 #include <linux/in.h>
  27 #include <linux/inet.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/if_packet.h>
  30 #include <linux/if_arp.h>
  31 #include <linux/gfp.h>
  32 #include <net/inet_common.h>
  33 #include <net/ip.h>
  34 #include <net/protocol.h>
  35 #include <net/netlink.h>
  36 #include <linux/skbuff.h>
  37 #include <linux/skmsg.h>
  38 #include <net/sock.h>
  39 #include <net/flow_dissector.h>
  40 #include <linux/errno.h>
  41 #include <linux/timer.h>
  42 #include <linux/uaccess.h>
  43 #include <asm/unaligned.h>
  44 #include <asm/cmpxchg.h>
  45 #include <linux/filter.h>
  46 #include <linux/ratelimit.h>
  47 #include <linux/seccomp.h>
  48 #include <linux/if_vlan.h>
  49 #include <linux/bpf.h>
  50 #include <linux/btf.h>
  51 #include <net/sch_generic.h>
  52 #include <net/cls_cgroup.h>
  53 #include <net/dst_metadata.h>
  54 #include <net/dst.h>
  55 #include <net/sock_reuseport.h>
  56 #include <net/busy_poll.h>
  57 #include <net/tcp.h>
  58 #include <net/xfrm.h>
  59 #include <net/udp.h>
  60 #include <linux/bpf_trace.h>
  61 #include <net/xdp_sock.h>
  62 #include <linux/inetdevice.h>
  63 #include <net/inet_hashtables.h>
  64 #include <net/inet6_hashtables.h>
  65 #include <net/ip_fib.h>
  66 #include <net/nexthop.h>
  67 #include <net/flow.h>
  68 #include <net/arp.h>
  69 #include <net/ipv6.h>
  70 #include <net/net_namespace.h>
  71 #include <linux/seg6_local.h>
  72 #include <net/seg6.h>
  73 #include <net/seg6_local.h>
  74 #include <net/lwtunnel.h>
  75 #include <net/ipv6_stubs.h>
  76 #include <net/bpf_sk_storage.h>
  77 #include <net/transp_v6.h>
  78 #include <linux/btf_ids.h>
  79
  80 static const struct bpf_func_proto *
  81 bpf_sk_base_func_proto(enum bpf_func_id func_id);
  82
  83 int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len)
  84 {
  85         if (in_compat_syscall()) {
  86                 struct compat_sock_fprog f32;
  87
  88                 if (len != sizeof(f32))
  89                         return -EINVAL;
  90                 if (copy_from_sockptr(&f32, src, sizeof(f32)))
  91                         return -EFAULT;
  92                 memset(dst, 0, sizeof(*dst));
  93                 dst->len = f32.len;
  94                 dst->filter = compat_ptr(f32.filter);
  95         } else {
  96                 if (len != sizeof(*dst))
  97                         return -EINVAL;
  98                 if (copy_from_sockptr(dst, src, sizeof(*dst)))
  99                         return -EFAULT;
 100         }
 101
 102         return 0;
 103 }
 104 EXPORT_SYMBOL_GPL(copy_bpf_fprog_from_user);
 105
 106 /**
 107  *      sk_filter_trim_cap - run a packet through a socket filter
 108  *      @sk: sock associated with &sk_buff
 109  *      @skb: buffer to filter
 110  *      @cap: limit on how short the eBPF program may trim the packet
 111  *
 112  * Run the eBPF program and then cut skb->data to correct size returned by
 113  * the program. If pkt_len is 0 we toss packet. If skb->len is smaller
 114  * than pkt_len we keep whole skb->data. This is the socket level
 115  * wrapper to BPF_PROG_RUN. It returns 0 if the packet should
 116  * be accepted or -EPERM if the packet should be tossed.
 117  *
 118  */
 119 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap)
 120 {
 121         int err;
 122         struct sk_filter *filter;
 123
 124         /*
 125          * If the skb was allocated from pfmemalloc reserves, only
 126          * allow SOCK_MEMALLOC sockets to use it as this socket is
 127          * helping free memory
 128          */
 129         if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) {
 130                 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP);
 131                 return -ENOMEM;
 132         }
 133         err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb);
 134         if (err)
 135                 return err;
 136
 137         err = security_sock_rcv_skb(sk, skb);
 138         if (err)
 139                 return err;
 140
 141         rcu_read_lock();
 142         filter = rcu_dereference(sk->sk_filter);
 143         if (filter) {
 144                 struct sock *save_sk = skb->sk;
 145                 unsigned int pkt_len;
 146
 147                 skb->sk = sk;
 148                 pkt_len = bpf_prog_run_save_cb(filter->prog, skb);
 149                 skb->sk = save_sk;
 150                 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM;
 151         }
 152         rcu_read_unlock();
 153
 154         return err;
 155 }
 156 EXPORT_SYMBOL(sk_filter_trim_cap);
 157
 158 BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb)
 159 {
 160         return skb_get_poff(skb);
 161 }
 162
 163 BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x)
 164 {
 165         struct nlattr *nla;
 166
 167         if (skb_is_nonlinear(skb))
 168                 return 0;
 169
 170         if (skb->len < sizeof(struct nlattr))
 171                 return 0;
 172
 173         if (a > skb->len - sizeof(struct nlattr))
 174                 return 0;
 175
 176         nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x);
 177         if (nla)
 178                 return (void *) nla - (void *) skb->data;
 179
 180         return 0;
 181 }
 182
 183 BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x)
 184 {
 185         struct nlattr *nla;
 186
 187         if (skb_is_nonlinear(skb))
 188                 return 0;
 189
 190         if (skb->len < sizeof(struct nlattr))
 191                 return 0;
 192
 193         if (a > skb->len - sizeof(struct nlattr))
 194                 return 0;
 195
 196         nla = (struct nlattr *) &skb->data[a];
 197         if (nla->nla_len > skb->len - a)
 198                 return 0;
 199
 200         nla = nla_find_nested(nla, x);
 201         if (nla)
 202                 return (void *) nla - (void *) skb->data;
 203
 204         return 0;
 205 }
 206
 207 BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *,
 208            data, int, headlen, int, offset)
 209 {
 210         u8 tmp, *ptr;
 211         const int len = sizeof(tmp);
 212
 213         if (offset >= 0) {
 214                 if (headlen - offset >= len)
 215                         return *(u8 *)(data + offset);
 216                 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
 217                         return tmp;
 218         } else {
 219                 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
 220                 if (likely(ptr))
 221                         return *(u8 *)ptr;
 222         }
 223
 224         return -EFAULT;
 225 }
 226
 227 BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb,
 228            int, offset)
 229 {
 230         return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len,
 231                                          offset);
 232 }
 233
 234 BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *,
 235            data, int, headlen, int, offset)
 236 {
 237         u16 tmp, *ptr;
 238         const int len = sizeof(tmp);
 239
 240         if (offset >= 0) {
 241                 if (headlen - offset >= len)
 242                         return get_unaligned_be16(data + offset);
 243                 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
 244                         return be16_to_cpu(tmp);
 245         } else {
 246                 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
 247                 if (likely(ptr))
 248                         return get_unaligned_be16(ptr);
 249         }
 250
 251         return -EFAULT;
 252 }
 253
 254 BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb,
 255            int, offset)
 256 {
 257         return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len,
 258                                           offset);
 259 }
 260
 261 BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *,
 262            data, int, headlen, int, offset)
 263 {
 264         u32 tmp, *ptr;
 265         const int len = sizeof(tmp);
 266
 267         if (likely(offset >= 0)) {
 268                 if (headlen - offset >= len)
 269                         return get_unaligned_be32(data + offset);
 270                 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
 271                         return be32_to_cpu(tmp);
 272         } else {
 273                 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
 274                 if (likely(ptr))
 275                         return get_unaligned_be32(ptr);
 276         }
 277
 278         return -EFAULT;
 279 }
 280
 281 BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb,
 282            int, offset)
 283 {
 284         return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len,
 285                                           offset);
 286 }
 287
 288 static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg,
 289                               struct bpf_insn *insn_buf)
 290 {
 291         struct bpf_insn *insn = insn_buf;
 292
 293         switch (skb_field) {
 294         case SKF_AD_MARK:
 295                 BUILD_BUG_ON(sizeof_field(struct sk_buff, mark) != 4);
 296
 297                 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg,
 298                                       offsetof(struct sk_buff, mark));
 299                 break;
 300
 301         case SKF_AD_PKTTYPE:
 302                 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET());
 303                 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX);
 304 #ifdef __BIG_ENDIAN_BITFIELD
 305                 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5);
 306 #endif
 307                 break;
 308
 309         case SKF_AD_QUEUE:
 310                 BUILD_BUG_ON(sizeof_field(struct sk_buff, queue_mapping) != 2);
 311
 312                 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
 313                                       offsetof(struct sk_buff, queue_mapping));
 314                 break;
 315
 316         case SKF_AD_VLAN_TAG:
 317                 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_tci) != 2);
 318
 319                 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */
 320                 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
 321                                       offsetof(struct sk_buff, vlan_tci));
 322                 break;
 323         case SKF_AD_VLAN_TAG_PRESENT:
 324                 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_VLAN_PRESENT_OFFSET());
 325                 if (PKT_VLAN_PRESENT_BIT)
 326                         *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, PKT_VLAN_PRESENT_BIT);
 327                 if (PKT_VLAN_PRESENT_BIT < 7)
 328                         *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1);
 329                 break;
 330         }
 331
 332         return insn - insn_buf;
 333 }
 334
 335 static bool convert_bpf_extensions(struct sock_filter *fp,
 336                                    struct bpf_insn **insnp)
 337 {
 338         struct bpf_insn *insn = *insnp;
 339         u32 cnt;
 340
 341         switch (fp->k) {
 342         case SKF_AD_OFF + SKF_AD_PROTOCOL:
 343                 BUILD_BUG_ON(sizeof_field(struct sk_buff, protocol) != 2);
 344
 345                 /* A = *(u16 *) (CTX + offsetof(protocol)) */
 346                 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
 347                                       offsetof(struct sk_buff, protocol));
 348                 /* A = ntohs(A) [emitting a nop or swap16] */
 349                 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
 350                 break;
 351
 352         case SKF_AD_OFF + SKF_AD_PKTTYPE:
 353                 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn);
 354                 insn += cnt - 1;
 355                 break;
 356
 357         case SKF_AD_OFF + SKF_AD_IFINDEX:
 358         case SKF_AD_OFF + SKF_AD_HATYPE:
 359                 BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4);
 360                 BUILD_BUG_ON(sizeof_field(struct net_device, type) != 2);
 361
 362                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
 363                                       BPF_REG_TMP, BPF_REG_CTX,
 364                                       offsetof(struct sk_buff, dev));
 365                 /* if (tmp != 0) goto pc + 1 */
 366                 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1);
 367                 *insn++ = BPF_EXIT_INSN();
 368                 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX)
 369                         *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP,
 370                                             offsetof(struct net_device, ifindex));
 371                 else
 372                         *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP,
 373                                             offsetof(struct net_device, type));
 374                 break;
 375
 376         case SKF_AD_OFF + SKF_AD_MARK:
 377                 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn);
 378                 insn += cnt - 1;
 379                 break;
 380
 381         case SKF_AD_OFF + SKF_AD_RXHASH:
 382                 BUILD_BUG_ON(sizeof_field(struct sk_buff, hash) != 4);
 383
 384                 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX,
 385                                     offsetof(struct sk_buff, hash));
 386                 break;
 387
 388         case SKF_AD_OFF + SKF_AD_QUEUE:
 389                 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn);
 390                 insn += cnt - 1;
 391                 break;
 392
 393         case SKF_AD_OFF + SKF_AD_VLAN_TAG:
 394                 cnt = convert_skb_access(SKF_AD_VLAN_TAG,
 395                                          BPF_REG_A, BPF_REG_CTX, insn);
 396                 insn += cnt - 1;
 397                 break;
 398
 399         case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT:
 400                 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT,
 401                                          BPF_REG_A, BPF_REG_CTX, insn);
 402                 insn += cnt - 1;
 403                 break;
 404
 405         case SKF_AD_OFF + SKF_AD_VLAN_TPID:
 406                 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_proto) != 2);
 407
 408                 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */
 409                 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
 410                                       offsetof(struct sk_buff, vlan_proto));
 411                 /* A = ntohs(A) [emitting a nop or swap16] */
 412                 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
 413                 break;
 414
 415         case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
 416         case SKF_AD_OFF + SKF_AD_NLATTR:
 417         case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
 418         case SKF_AD_OFF + SKF_AD_CPU:
 419         case SKF_AD_OFF + SKF_AD_RANDOM:
 420                 /* arg1 = CTX */
 421                 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX);
 422                 /* arg2 = A */
 423                 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A);
 424                 /* arg3 = X */
 425                 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X);
 426                 /* Emit call(arg1=CTX, arg2=A, arg3=X) */
 427                 switch (fp->k) {
 428                 case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
 429                         *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset);
 430                         break;
 431                 case SKF_AD_OFF + SKF_AD_NLATTR:
 432                         *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr);
 433                         break;
 434                 case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
 435                         *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest);
 436                         break;
 437                 case SKF_AD_OFF + SKF_AD_CPU:
 438                         *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id);
 439                         break;
 440                 case SKF_AD_OFF + SKF_AD_RANDOM:
 441                         *insn = BPF_EMIT_CALL(bpf_user_rnd_u32);
 442                         bpf_user_rnd_init_once();
 443                         break;
 444                 }
 445                 break;
 446
 447         case SKF_AD_OFF + SKF_AD_ALU_XOR_X:
 448                 /* A ^= X */
 449                 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X);
 450                 break;
 451
 452         default:
 453                 /* This is just a dummy call to avoid letting the compiler
 454                  * evict __bpf_call_base() as an optimization. Placed here
 455                  * where no-one bothers.
 456                  */
 457                 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0);
 458                 return false;
 459         }
 460
 461         *insnp = insn;
 462         return true;
 463 }
 464
 465 static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp)
 466 {
 467         const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS);
 468         int size = bpf_size_to_bytes(BPF_SIZE(fp->code));
 469         bool endian = BPF_SIZE(fp->code) == BPF_H ||
 470                       BPF_SIZE(fp->code) == BPF_W;
 471         bool indirect = BPF_MODE(fp->code) == BPF_IND;
 472         const int ip_align = NET_IP_ALIGN;
 473         struct bpf_insn *insn = *insnp;
 474         int offset = fp->k;
 475
 476         if (!indirect &&
 477             ((unaligned_ok && offset >= 0) ||
 478              (!unaligned_ok && offset >= 0 &&
 479               offset + ip_align >= 0 &&
 480               offset + ip_align % size == 0))) {
 481                 bool ldx_off_ok = offset <= S16_MAX;
 482
 483                 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H);
 484                 if (offset)
 485                         *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset);
 486                 *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP,
 487                                       size, 2 + endian + (!ldx_off_ok * 2));
 488                 if (ldx_off_ok) {
 489                         *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A,
 490                                               BPF_REG_D, offset);
 491                 } else {
 492                         *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D);
 493                         *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset);
 494                         *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A,
 495                                               BPF_REG_TMP, 0);
 496                 }
 497                 if (endian)
 498                         *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8);
 499                 *insn++ = BPF_JMP_A(8);
 500         }
 501
 502         *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX);
 503         *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D);
 504         *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H);
 505         if (!indirect) {
 506                 *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset);
 507         } else {
 508                 *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X);
 509                 if (fp->k)
 510                         *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset);
 511         }
 512
 513         switch (BPF_SIZE(fp->code)) {
 514         case BPF_B:
 515                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8);
 516                 break;
 517         case BPF_H:
 518                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16);
 519                 break;
 520         case BPF_W:
 521                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32);
 522                 break;
 523         default:
 524                 return false;
 525         }
 526
 527         *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2);
 528         *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
 529         *insn   = BPF_EXIT_INSN();
 530
 531         *insnp = insn;
 532         return true;
 533 }
 534
 535 /**
 536  *      bpf_convert_filter - convert filter program
 537  *      @prog: the user passed filter program
 538  *      @len: the length of the user passed filter program
 539  *      @new_prog: allocated 'struct bpf_prog' or NULL
 540  *      @new_len: pointer to store length of converted program
 541  *      @seen_ld_abs: bool whether we've seen ld_abs/ind
 542  *
 543  * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn'
 544  * style extended BPF (eBPF).
 545  * Conversion workflow:
 546  *
 547  * 1) First pass for calculating the new program length:
 548  *   bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs)
 549  *
 550  * 2) 2nd pass to remap in two passes: 1st pass finds new
 551  *    jump offsets, 2nd pass remapping:
 552  *   bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs)
 553  */
 554 static int bpf_convert_filter(struct sock_filter *prog, int len,
 555                               struct bpf_prog *new_prog, int *new_len,
 556                               bool *seen_ld_abs)
 557 {
 558         int new_flen = 0, pass = 0, target, i, stack_off;
 559         struct bpf_insn *new_insn, *first_insn = NULL;
 560         struct sock_filter *fp;
 561         int *addrs = NULL;
 562         u8 bpf_src;
 563
 564         BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK);
 565         BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG);
 566
 567         if (len <= 0 || len > BPF_MAXINSNS)
 568                 return -EINVAL;
 569
 570         if (new_prog) {
 571                 first_insn = new_prog->insnsi;
 572                 addrs = kcalloc(len, sizeof(*addrs),
 573                                 GFP_KERNEL | __GFP_NOWARN);
 574                 if (!addrs)
 575                         return -ENOMEM;
 576         }
 577
 578 do_pass:
 579         new_insn = first_insn;
 580         fp = prog;
 581
 582         /* Classic BPF related prologue emission. */
 583         if (new_prog) {
 584                 /* Classic BPF expects A and X to be reset first. These need
 585                  * to be guaranteed to be the first two instructions.
 586                  */
 587                 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
 588                 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X);
 589
 590                 /* All programs must keep CTX in callee saved BPF_REG_CTX.
 591                  * In eBPF case it's done by the compiler, here we need to
 592                  * do this ourself. Initial CTX is present in BPF_REG_ARG1.
 593                  */
 594                 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1);
 595                 if (*seen_ld_abs) {
 596                         /* For packet access in classic BPF, cache skb->data
 597                          * in callee-saved BPF R8 and skb->len - skb->data_len
 598                          * (headlen) in BPF R9. Since classic BPF is read-only
 599                          * on CTX, we only need to cache it once.
 600                          */
 601                         *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
 602                                                   BPF_REG_D, BPF_REG_CTX,
 603                                                   offsetof(struct sk_buff, data));
 604                         *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX,
 605                                                   offsetof(struct sk_buff, len));
 606                         *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX,
 607                                                   offsetof(struct sk_buff, data_len));
 608                         *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP);
 609                 }
 610         } else {
 611                 new_insn += 3;
 612         }
 613
 614         for (i = 0; i < len; fp++, i++) {
 615                 struct bpf_insn tmp_insns[32] = { };
 616                 struct bpf_insn *insn = tmp_insns;
 617
 618                 if (addrs)
 619                         addrs[i] = new_insn - first_insn;
 620
 621                 switch (fp->code) {
 622                 /* All arithmetic insns and skb loads map as-is. */
 623                 case BPF_ALU | BPF_ADD | BPF_X:
 624                 case BPF_ALU | BPF_ADD | BPF_K:
 625                 case BPF_ALU | BPF_SUB | BPF_X:
 626                 case BPF_ALU | BPF_SUB | BPF_K:
 627                 case BPF_ALU | BPF_AND | BPF_X:
 628                 case BPF_ALU | BPF_AND | BPF_K:
 629                 case BPF_ALU | BPF_OR | BPF_X:
 630                 case BPF_ALU | BPF_OR | BPF_K:
 631                 case BPF_ALU | BPF_LSH | BPF_X:
 632                 case BPF_ALU | BPF_LSH | BPF_K:
 633                 case BPF_ALU | BPF_RSH | BPF_X:
 634                 case BPF_ALU | BPF_RSH | BPF_K:
 635                 case BPF_ALU | BPF_XOR | BPF_X:
 636                 case BPF_ALU | BPF_XOR | BPF_K:
 637                 case BPF_ALU | BPF_MUL | BPF_X:
 638                 case BPF_ALU | BPF_MUL | BPF_K:
 639                 case BPF_ALU | BPF_DIV | BPF_X:
 640                 case BPF_ALU | BPF_DIV | BPF_K:
 641                 case BPF_ALU | BPF_MOD | BPF_X:
 642                 case BPF_ALU | BPF_MOD | BPF_K:
 643                 case BPF_ALU | BPF_NEG:
 644                 case BPF_LD | BPF_ABS | BPF_W:
 645                 case BPF_LD | BPF_ABS | BPF_H:
 646                 case BPF_LD | BPF_ABS | BPF_B:
 647                 case BPF_LD | BPF_IND | BPF_W:
 648                 case BPF_LD | BPF_IND | BPF_H:
 649                 case BPF_LD | BPF_IND | BPF_B:
 650                         /* Check for overloaded BPF extension and
 651                          * directly convert it if found, otherwise
 652                          * just move on with mapping.
 653                          */
 654                         if (BPF_CLASS(fp->code) == BPF_LD &&
 655                             BPF_MODE(fp->code) == BPF_ABS &&
 656                             convert_bpf_extensions(fp, &insn))
 657                                 break;
 658                         if (BPF_CLASS(fp->code) == BPF_LD &&
 659                             convert_bpf_ld_abs(fp, &insn)) {
 660                                 *seen_ld_abs = true;
 661                                 break;
 662                         }
 663
 664                         if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) ||
 665                             fp->code == (BPF_ALU | BPF_MOD | BPF_X)) {
 666                                 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X);
 667                                 /* Error with exception code on div/mod by 0.
 668                                  * For cBPF programs, this was always return 0.
 669                                  */
 670                                 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2);
 671                                 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
 672                                 *insn++ = BPF_EXIT_INSN();
 673                         }
 674
 675                         *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k);
 676                         break;
 677
 678                 /* Jump transformation cannot use BPF block macros
 679                  * everywhere as offset calculation and target updates
 680                  * require a bit more work than the rest, i.e. jump
 681                  * opcodes map as-is, but offsets need adjustment.
 682                  */
 683
 684 #define BPF_EMIT_JMP                                                    \
 685         do {                                                            \
 686                 const s32 off_min = S16_MIN, off_max = S16_MAX;         \
 687                 s32 off;                                                \
 688                                                                         \
 689                 if (target >= len || target < 0)                        \
 690                         goto err;                                       \
 691                 off = addrs ? addrs[target] - addrs[i] - 1 : 0;         \
 692                 /* Adjust pc relative offset for 2nd or 3rd insn. */    \
 693                 off -= insn - tmp_insns;                                \
 694                 /* Reject anything not fitting into insn->off. */       \
 695                 if (off < off_min || off > off_max)                     \
 696                         goto err;                                       \
 697                 insn->off = off;                                        \
 698         } while (0)
 699
 700                 case BPF_JMP | BPF_JA:
 701                         target = i + fp->k + 1;
 702                         insn->code = fp->code;
 703                         BPF_EMIT_JMP;
 704                         break;
 705
 706                 case BPF_JMP | BPF_JEQ | BPF_K:
 707                 case BPF_JMP | BPF_JEQ | BPF_X:
 708                 case BPF_JMP | BPF_JSET | BPF_K:
 709                 case BPF_JMP | BPF_JSET | BPF_X:
 710                 case BPF_JMP | BPF_JGT | BPF_K:
 711                 case BPF_JMP | BPF_JGT | BPF_X:
 712                 case BPF_JMP | BPF_JGE | BPF_K:
 713                 case BPF_JMP | BPF_JGE | BPF_X:
 714                         if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) {
 715                                 /* BPF immediates are signed, zero extend
 716                                  * immediate into tmp register and use it
 717                                  * in compare insn.
 718                                  */
 719                                 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k);
 720
 721                                 insn->dst_reg = BPF_REG_A;
 722                                 insn->src_reg = BPF_REG_TMP;
 723                                 bpf_src = BPF_X;
 724                         } else {
 725                                 insn->dst_reg = BPF_REG_A;
 726                                 insn->imm = fp->k;
 727                                 bpf_src = BPF_SRC(fp->code);
 728                                 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0;
 729                         }
 730
 731                         /* Common case where 'jump_false' is next insn. */
 732                         if (fp->jf == 0) {
 733                                 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
 734                                 target = i + fp->jt + 1;
 735                                 BPF_EMIT_JMP;
 736                                 break;
 737                         }
 738
 739                         /* Convert some jumps when 'jump_true' is next insn. */
 740                         if (fp->jt == 0) {
 741                                 switch (BPF_OP(fp->code)) {
 742                                 case BPF_JEQ:
 743                                         insn->code = BPF_JMP | BPF_JNE | bpf_src;
 744                                         break;
 745                                 case BPF_JGT:
 746                                         insn->code = BPF_JMP | BPF_JLE | bpf_src;
 747                                         break;
 748                                 case BPF_JGE:
 749                                         insn->code = BPF_JMP | BPF_JLT | bpf_src;
 750                                         break;
 751                                 default:
 752                                         goto jmp_rest;
 753                                 }
 754
 755                                 target = i + fp->jf + 1;
 756                                 BPF_EMIT_JMP;
 757                                 break;
 758                         }
 759 jmp_rest:
 760                         /* Other jumps are mapped into two insns: Jxx and JA. */
 761                         target = i + fp->jt + 1;
 762                         insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
 763                         BPF_EMIT_JMP;
 764                         insn++;
 765
 766                         insn->code = BPF_JMP | BPF_JA;
 767                         target = i + fp->jf + 1;
 768                         BPF_EMIT_JMP;
 769                         break;
 770
 771                 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */
 772                 case BPF_LDX | BPF_MSH | BPF_B: {
 773                         struct sock_filter tmp = {
 774                                 .code   = BPF_LD | BPF_ABS | BPF_B,
 775                                 .k      = fp->k,
 776                         };
 777
 778                         *seen_ld_abs = true;
 779
 780                         /* X = A */
 781                         *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
 782                         /* A = BPF_R0 = *(u8 *) (skb->data + K) */
 783                         convert_bpf_ld_abs(&tmp, &insn);
 784                         insn++;
 785                         /* A &= 0xf */
 786                         *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf);
 787                         /* A <<= 2 */
 788                         *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2);
 789                         /* tmp = X */
 790                         *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X);
 791                         /* X = A */
 792                         *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
 793                         /* A = tmp */
 794                         *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP);
 795                         break;
 796                 }
 797                 /* RET_K is remaped into 2 insns. RET_A case doesn't need an
 798                  * extra mov as BPF_REG_0 is already mapped into BPF_REG_A.
 799                  */
 800                 case BPF_RET | BPF_A:
 801                 case BPF_RET | BPF_K:
 802                         if (BPF_RVAL(fp->code) == BPF_K)
 803                                 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0,
 804                                                         0, fp->k);
 805                         *insn = BPF_EXIT_INSN();
 806                         break;
 807
 808                 /* Store to stack. */
 809                 case BPF_ST:
 810                 case BPF_STX:
 811                         stack_off = fp->k * 4  + 4;
 812                         *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) ==
 813                                             BPF_ST ? BPF_REG_A : BPF_REG_X,
 814                                             -stack_off);
 815                         /* check_load_and_stores() verifies that classic BPF can
 816                          * load from stack only after write, so tracking
 817                          * stack_depth for ST|STX insns is enough
 818                          */
 819                         if (new_prog && new_prog->aux->stack_depth < stack_off)
 820                                 new_prog->aux->stack_depth = stack_off;
 821                         break;
 822
 823                 /* Load from stack. */
 824                 case BPF_LD | BPF_MEM:
 825                 case BPF_LDX | BPF_MEM:
 826                         stack_off = fp->k * 4  + 4;
 827                         *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD  ?
 828                                             BPF_REG_A : BPF_REG_X, BPF_REG_FP,
 829                                             -stack_off);
 830                         break;
 831
 832                 /* A = K or X = K */
 833                 case BPF_LD | BPF_IMM:
 834                 case BPF_LDX | BPF_IMM:
 835                         *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ?
 836                                               BPF_REG_A : BPF_REG_X, fp->k);
 837                         break;
 838
 839                 /* X = A */
 840                 case BPF_MISC | BPF_TAX:
 841                         *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
 842                         break;
 843
 844                 /* A = X */
 845                 case BPF_MISC | BPF_TXA:
 846                         *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X);
 847                         break;
 848
 849                 /* A = skb->len or X = skb->len */
 850                 case BPF_LD | BPF_W | BPF_LEN:
 851                 case BPF_LDX | BPF_W | BPF_LEN:
 852                         *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ?
 853                                             BPF_REG_A : BPF_REG_X, BPF_REG_CTX,
 854                                             offsetof(struct sk_buff, len));
 855                         break;
 856
 857                 /* Access seccomp_data fields. */
 858                 case BPF_LDX | BPF_ABS | BPF_W:
 859                         /* A = *(u32 *) (ctx + K) */
 860                         *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k);
 861                         break;
 862
 863                 /* Unknown instruction. */
 864                 default:
 865                         goto err;
 866                 }
 867
 868                 insn++;
 869                 if (new_prog)
 870                         memcpy(new_insn, tmp_insns,
 871                                sizeof(*insn) * (insn - tmp_insns));
 872                 new_insn += insn - tmp_insns;
 873         }
 874
 875         if (!new_prog) {
 876                 /* Only calculating new length. */
 877                 *new_len = new_insn - first_insn;
 878                 if (*seen_ld_abs)
 879                         *new_len += 4; /* Prologue bits. */
 880                 return 0;
 881         }
 882
 883         pass++;
 884         if (new_flen != new_insn - first_insn) {
 885                 new_flen = new_insn - first_insn;
 886                 if (pass > 2)
 887                         goto err;
 888                 goto do_pass;
 889         }
 890
 891         kfree(addrs);
 892         BUG_ON(*new_len != new_flen);
 893         return 0;
 894 err:
 895         kfree(addrs);
 896         return -EINVAL;
 897 }
 898
 899 /* Security:
 900  *
 901  * As we dont want to clear mem[] array for each packet going through
 902  * __bpf_prog_run(), we check that filter loaded by user never try to read
 903  * a cell if not previously written, and we check all branches to be sure
 904  * a malicious user doesn't try to abuse us.
 905  */
 906 static int check_load_and_stores(const struct sock_filter *filter, int flen)
 907 {
 908         u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */
 909         int pc, ret = 0;
 910
 911         BUILD_BUG_ON(BPF_MEMWORDS > 16);
 912
 913         masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL);
 914         if (!masks)
 915                 return -ENOMEM;
 916
 917         memset(masks, 0xff, flen * sizeof(*masks));
 918
 919         for (pc = 0; pc < flen; pc++) {
 920                 memvalid &= masks[pc];
 921
 922                 switch (filter[pc].code) {
 923                 case BPF_ST:
 924                 case BPF_STX:
 925                         memvalid |= (1 << filter[pc].k);
 926                         break;
 927                 case BPF_LD | BPF_MEM:
 928                 case BPF_LDX | BPF_MEM:
 929                         if (!(memvalid & (1 << filter[pc].k))) {
 930                                 ret = -EINVAL;
 931                                 goto error;
 932                         }
 933                         break;
 934                 case BPF_JMP | BPF_JA:
 935                         /* A jump must set masks on target */
 936                         masks[pc + 1 + filter[pc].k] &= memvalid;
 937                         memvalid = ~0;
 938                         break;
 939                 case BPF_JMP | BPF_JEQ | BPF_K:
 940                 case BPF_JMP | BPF_JEQ | BPF_X:
 941                 case BPF_JMP | BPF_JGE | BPF_K:
 942                 case BPF_JMP | BPF_JGE | BPF_X:
 943                 case BPF_JMP | BPF_JGT | BPF_K:
 944                 case BPF_JMP | BPF_JGT | BPF_X:
 945                 case BPF_JMP | BPF_JSET | BPF_K:
 946                 case BPF_JMP | BPF_JSET | BPF_X:
 947                         /* A jump must set masks on targets */
 948                         masks[pc + 1 + filter[pc].jt] &= memvalid;
 949                         masks[pc + 1 + filter[pc].jf] &= memvalid;
 950                         memvalid = ~0;
 951                         break;
 952                 }
 953         }
 954 error:
 955         kfree(masks);
 956         return ret;
 957 }
 958
 959 static bool chk_code_allowed(u16 code_to_probe)
 960 {
 961         static const bool codes[] = {
 962                 /* 32 bit ALU operations */
 963                 [BPF_ALU | BPF_ADD | BPF_K] = true,
 964                 [BPF_ALU | BPF_ADD | BPF_X] = true,
 965                 [BPF_ALU | BPF_SUB | BPF_K] = true,
 966                 [BPF_ALU | BPF_SUB | BPF_X] = true,
 967                 [BPF_ALU | BPF_MUL | BPF_K] = true,
 968                 [BPF_ALU | BPF_MUL | BPF_X] = true,
 969                 [BPF_ALU | BPF_DIV | BPF_K] = true,
 970                 [BPF_ALU | BPF_DIV | BPF_X] = true,
 971                 [BPF_ALU | BPF_MOD | BPF_K] = true,
 972                 [BPF_ALU | BPF_MOD | BPF_X] = true,
 973                 [BPF_ALU | BPF_AND | BPF_K] = true,
 974                 [BPF_ALU | BPF_AND | BPF_X] = true,
 975                 [BPF_ALU | BPF_OR | BPF_K] = true,
 976                 [BPF_ALU | BPF_OR | BPF_X] = true,
 977                 [BPF_ALU | BPF_XOR | BPF_K] = true,
 978                 [BPF_ALU | BPF_XOR | BPF_X] = true,
 979                 [BPF_ALU | BPF_LSH | BPF_K] = true,
 980                 [BPF_ALU | BPF_LSH | BPF_X] = true,
 981                 [BPF_ALU | BPF_RSH | BPF_K] = true,
 982                 [BPF_ALU | BPF_RSH | BPF_X] = true,
 983                 [BPF_ALU | BPF_NEG] = true,
 984                 /* Load instructions */
 985                 [BPF_LD | BPF_W | BPF_ABS] = true,
 986                 [BPF_LD | BPF_H | BPF_ABS] = true,
 987                 [BPF_LD | BPF_B | BPF_ABS] = true,
 988                 [BPF_LD | BPF_W | BPF_LEN] = true,
 989                 [BPF_LD | BPF_W | BPF_IND] = true,
 990                 [BPF_LD | BPF_H | BPF_IND] = true,
 991                 [BPF_LD | BPF_B | BPF_IND] = true,
 992                 [BPF_LD | BPF_IMM] = true,
 993                 [BPF_LD | BPF_MEM] = true,
 994                 [BPF_LDX | BPF_W | BPF_LEN] = true,
 995                 [BPF_LDX | BPF_B | BPF_MSH] = true,
 996                 [BPF_LDX | BPF_IMM] = true,
 997                 [BPF_LDX | BPF_MEM] = true,
 998                 /* Store instructions */
 999                 [BPF_ST] = true,
1000                 [BPF_STX] = true,
1001                 /* Misc instructions */
1002                 [BPF_MISC | BPF_TAX] = true,
1003                 [BPF_MISC | BPF_TXA] = true,
1004                 /* Return instructions */
1005                 [BPF_RET | BPF_K] = true,
1006                 [BPF_RET | BPF_A] = true,
1007                 /* Jump instructions */
1008                 [BPF_JMP | BPF_JA] = true,
1009                 [BPF_JMP | BPF_JEQ | BPF_K] = true,
1010                 [BPF_JMP | BPF_JEQ | BPF_X] = true,
1011                 [BPF_JMP | BPF_JGE | BPF_K] = true,
1012                 [BPF_JMP | BPF_JGE | BPF_X] = true,
1013                 [BPF_JMP | BPF_JGT | BPF_K] = true,
1014                 [BPF_JMP | BPF_JGT | BPF_X] = true,
1015                 [BPF_JMP | BPF_JSET | BPF_K] = true,
1016                 [BPF_JMP | BPF_JSET | BPF_X] = true,
1017         };
1018
1019         if (code_to_probe >= ARRAY_SIZE(codes))
1020                 return false;
1021
1022         return codes[code_to_probe];
1023 }
1024
1025 static bool bpf_check_basics_ok(const struct sock_filter *filter,
1026                                 unsigned int flen)
1027 {
1028         if (filter == NULL)
1029                 return false;
1030         if (flen == 0 || flen > BPF_MAXINSNS)
1031                 return false;
1032
1033         return true;
1034 }
1035
1036 /**
1037  *      bpf_check_classic - verify socket filter code
1038  *      @filter: filter to verify
1039  *      @flen: length of filter
1040  *
1041  * Check the user's filter code. If we let some ugly
1042  * filter code slip through kaboom! The filter must contain
1043  * no references or jumps that are out of range, no illegal
1044  * instructions, and must end with a RET instruction.
1045  *
1046  * All jumps are forward as they are not signed.
1047  *
1048  * Returns 0 if the rule set is legal or -EINVAL if not.
1049  */
1050 static int bpf_check_classic(const struct sock_filter *filter,
1051                              unsigned int flen)
1052 {
1053         bool anc_found;
1054         int pc;
1055
1056         /* Check the filter code now */
1057         for (pc = 0; pc < flen; pc++) {
1058                 const struct sock_filter *ftest = &filter[pc];
1059
1060                 /* May we actually operate on this code? */
1061                 if (!chk_code_allowed(ftest->code))
1062                         return -EINVAL;
1063
1064                 /* Some instructions need special checks */
1065                 switch (ftest->code) {
1066                 case BPF_ALU | BPF_DIV | BPF_K:
1067                 case BPF_ALU | BPF_MOD | BPF_K:
1068                         /* Check for division by zero */
1069                         if (ftest->k == 0)
1070                                 return -EINVAL;
1071                         break;
1072                 case BPF_ALU | BPF_LSH | BPF_K:
1073                 case BPF_ALU | BPF_RSH | BPF_K:
1074                         if (ftest->k >= 32)
1075                                 return -EINVAL;
1076                         break;
1077                 case BPF_LD | BPF_MEM:
1078                 case BPF_LDX | BPF_MEM:
1079                 case BPF_ST:
1080                 case BPF_STX:
1081                         /* Check for invalid memory addresses */
1082                         if (ftest->k >= BPF_MEMWORDS)
1083                                 return -EINVAL;
1084                         break;
1085                 case BPF_JMP | BPF_JA:
1086                         /* Note, the large ftest->k might cause loops.
1087                          * Compare this with conditional jumps below,
1088                          * where offsets are limited. --ANK (981016)
1089                          */
1090                         if (ftest->k >= (unsigned int)(flen - pc - 1))
1091                                 return -EINVAL;
1092                         break;
1093                 case BPF_JMP | BPF_JEQ | BPF_K:
1094                 case BPF_JMP | BPF_JEQ | BPF_X:
1095                 case BPF_JMP | BPF_JGE | BPF_K:
1096                 case BPF_JMP | BPF_JGE | BPF_X:
1097                 case BPF_JMP | BPF_JGT | BPF_K:
1098                 case BPF_JMP | BPF_JGT | BPF_X:
1099                 case BPF_JMP | BPF_JSET | BPF_K:
1100                 case BPF_JMP | BPF_JSET | BPF_X:
1101                         /* Both conditionals must be safe */
1102                         if (pc + ftest->jt + 1 >= flen ||
1103                             pc + ftest->jf + 1 >= flen)
1104                                 return -EINVAL;
1105                         break;
1106                 case BPF_LD | BPF_W | BPF_ABS:
1107                 case BPF_LD | BPF_H | BPF_ABS:
1108                 case BPF_LD | BPF_B | BPF_ABS:
1109                         anc_found = false;
1110                         if (bpf_anc_helper(ftest) & BPF_ANC)
1111                                 anc_found = true;
1112                         /* Ancillary operation unknown or unsupported */
1113                         if (anc_found == false && ftest->k >= SKF_AD_OFF)
1114                                 return -EINVAL;
1115                 }
1116         }
1117
1118         /* Last instruction must be a RET code */
1119         switch (filter[flen - 1].code) {
1120         case BPF_RET | BPF_K:
1121         case BPF_RET | BPF_A:
1122                 return check_load_and_stores(filter, flen);
1123         }
1124
1125         return -EINVAL;
1126 }
1127
1128 static int bpf_prog_store_orig_filter(struct bpf_prog *fp,
1129                                       const struct sock_fprog *fprog)
1130 {
1131         unsigned int fsize = bpf_classic_proglen(fprog);
1132         struct sock_fprog_kern *fkprog;
1133
1134         fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL);
1135         if (!fp->orig_prog)
1136                 return -ENOMEM;
1137
1138         fkprog = fp->orig_prog;
1139         fkprog->len = fprog->len;
1140
1141         fkprog->filter = kmemdup(fp->insns, fsize,
1142                                  GFP_KERNEL | __GFP_NOWARN);
1143         if (!fkprog->filter) {
1144                 kfree(fp->orig_prog);
1145                 return -ENOMEM;
1146         }
1147
1148         return 0;
1149 }
1150
1151 static void bpf_release_orig_filter(struct bpf_prog *fp)
1152 {
1153         struct sock_fprog_kern *fprog = fp->orig_prog;
1154
1155         if (fprog) {
1156                 kfree(fprog->filter);
1157                 kfree(fprog);
1158         }
1159 }
1160
1161 static void __bpf_prog_release(struct bpf_prog *prog)
1162 {
1163         if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) {
1164                 bpf_prog_put(prog);
1165         } else {
1166                 bpf_release_orig_filter(prog);
1167                 bpf_prog_free(prog);
1168         }
1169 }
1170
1171 static void __sk_filter_release(struct sk_filter *fp)
1172 {
1173         __bpf_prog_release(fp->prog);
1174         kfree(fp);
1175 }
1176
1177 /**
1178  *      sk_filter_release_rcu - Release a socket filter by rcu_head
1179  *      @rcu: rcu_head that contains the sk_filter to free
1180  */
1181 static void sk_filter_release_rcu(struct rcu_head *rcu)
1182 {
1183         struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu);
1184
1185         __sk_filter_release(fp);
1186 }
1187
1188 /**
1189  *      sk_filter_release - release a socket filter
1190  *      @fp: filter to remove
1191  *
1192  *      Remove a filter from a socket and release its resources.
1193  */
1194 static void sk_filter_release(struct sk_filter *fp)
1195 {
1196         if (refcount_dec_and_test(&fp->refcnt))
1197                 call_rcu(&fp->rcu, sk_filter_release_rcu);
1198 }
1199
1200 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp)
1201 {
1202         u32 filter_size = bpf_prog_size(fp->prog->len);
1203
1204         atomic_sub(filter_size, &sk->sk_omem_alloc);
1205         sk_filter_release(fp);
1206 }
1207
1208 /* try to charge the socket memory if there is space available
1209  * return true on success
1210  */
1211 static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp)
1212 {
1213         u32 filter_size = bpf_prog_size(fp->prog->len);
1214
1215         /* same check as in sock_kmalloc() */
1216         if (filter_size <= sysctl_optmem_max &&
1217             atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) {
1218                 atomic_add(filter_size, &sk->sk_omem_alloc);
1219                 return true;
1220         }
1221         return false;
1222 }
1223
1224 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp)
1225 {
1226         if (!refcount_inc_not_zero(&fp->refcnt))
1227                 return false;
1228
1229         if (!__sk_filter_charge(sk, fp)) {
1230                 sk_filter_release(fp);
1231                 return false;
1232         }
1233         return true;
1234 }
1235
1236 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp)
1237 {
1238         struct sock_filter *old_prog;
1239         struct bpf_prog *old_fp;
1240         int err, new_len, old_len = fp->len;
1241         bool seen_ld_abs = false;
1242
1243         /* We are free to overwrite insns et al right here as it
1244          * won't be used at this point in time anymore internally
1245          * after the migration to the internal BPF instruction
1246          * representation.
1247          */
1248         BUILD_BUG_ON(sizeof(struct sock_filter) !=
1249                      sizeof(struct bpf_insn));
1250
1251         /* Conversion cannot happen on overlapping memory areas,
1252          * so we need to keep the user BPF around until the 2nd
1253          * pass. At this time, the user BPF is stored in fp->insns.
1254          */
1255         old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter),
1256                            GFP_KERNEL | __GFP_NOWARN);
1257         if (!old_prog) {
1258                 err = -ENOMEM;
1259                 goto out_err;
1260         }
1261
1262         /* 1st pass: calculate the new program length. */
1263         err = bpf_convert_filter(old_prog, old_len, NULL, &new_len,
1264                                  &seen_ld_abs);
1265         if (err)
1266                 goto out_err_free;
1267
1268         /* Expand fp for appending the new filter representation. */
1269         old_fp = fp;
1270         fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0);
1271         if (!fp) {
1272                 /* The old_fp is still around in case we couldn't
1273                  * allocate new memory, so uncharge on that one.
1274                  */
1275                 fp = old_fp;
1276                 err = -ENOMEM;
1277                 goto out_err_free;
1278         }
1279
1280         fp->len = new_len;
1281
1282         /* 2nd pass: remap sock_filter insns into bpf_insn insns. */
1283         err = bpf_convert_filter(old_prog, old_len, fp, &new_len,
1284                                  &seen_ld_abs);
1285         if (err)
1286                 /* 2nd bpf_convert_filter() can fail only if it fails
1287                  * to allocate memory, remapping must succeed. Note,
1288                  * that at this time old_fp has already been released
1289                  * by krealloc().
1290                  */
1291                 goto out_err_free;
1292
1293         fp = bpf_prog_select_runtime(fp, &err);
1294         if (err)
1295                 goto out_err_free;
1296
1297         kfree(old_prog);
1298         return fp;
1299
1300 out_err_free:
1301         kfree(old_prog);
1302 out_err:
1303         __bpf_prog_release(fp);
1304         return ERR_PTR(err);
1305 }
1306
1307 static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp,
1308                                            bpf_aux_classic_check_t trans)
1309 {
1310         int err;
1311
1312         fp->bpf_func = NULL;
1313         fp->jited = 0;
1314
1315         err = bpf_check_classic(fp->insns, fp->len);
1316         if (err) {
1317                 __bpf_prog_release(fp);
1318                 return ERR_PTR(err);
1319         }
1320
1321         /* There might be additional checks and transformations
1322          * needed on classic filters, f.e. in case of seccomp.
1323          */
1324         if (trans) {
1325                 err = trans(fp->insns, fp->len);
1326                 if (err) {
1327                         __bpf_prog_release(fp);
1328                         return ERR_PTR(err);
1329                 }
1330         }
1331
1332         /* Probe if we can JIT compile the filter and if so, do
1333          * the compilation of the filter.
1334          */
1335         bpf_jit_compile(fp);
1336
1337         /* JIT compiler couldn't process this filter, so do the
1338          * internal BPF translation for the optimized interpreter.
1339          */
1340         if (!fp->jited)
1341                 fp = bpf_migrate_filter(fp);
1342
1343         return fp;
1344 }
1345
1346 /**
1347  *      bpf_prog_create - create an unattached filter
1348  *      @pfp: the unattached filter that is created
1349  *      @fprog: the filter program
1350  *
1351  * Create a filter independent of any socket. We first run some
1352  * sanity checks on it to make sure it does not explode on us later.
1353  * If an error occurs or there is insufficient memory for the filter
1354  * a negative errno code is returned. On success the return is zero.
1355  */
1356 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog)
1357 {
1358         unsigned int fsize = bpf_classic_proglen(fprog);
1359         struct bpf_prog *fp;
1360
1361         /* Make sure new filter is there and in the right amounts. */
1362         if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1363                 return -EINVAL;
1364
1365         fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1366         if (!fp)
1367                 return -ENOMEM;
1368
1369         memcpy(fp->insns, fprog->filter, fsize);
1370
1371         fp->len = fprog->len;
1372         /* Since unattached filters are not copied back to user
1373          * space through sk_get_filter(), we do not need to hold
1374          * a copy here, and can spare us the work.
1375          */
1376         fp->orig_prog = NULL;
1377
1378         /* bpf_prepare_filter() already takes care of freeing
1379          * memory in case something goes wrong.
1380          */
1381         fp = bpf_prepare_filter(fp, NULL);
1382         if (IS_ERR(fp))
1383                 return PTR_ERR(fp);
1384
1385         *pfp = fp;
1386         return 0;
1387 }
1388 EXPORT_SYMBOL_GPL(bpf_prog_create);
1389
1390 /**
1391  *      bpf_prog_create_from_user - create an unattached filter from user buffer
1392  *      @pfp: the unattached filter that is created
1393  *      @fprog: the filter program
1394  *      @trans: post-classic verifier transformation handler
1395  *      @save_orig: save classic BPF program
1396  *
1397  * This function effectively does the same as bpf_prog_create(), only
1398  * that it builds up its insns buffer from user space provided buffer.
1399  * It also allows for passing a bpf_aux_classic_check_t handler.
1400  */
1401 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
1402                               bpf_aux_classic_check_t trans, bool save_orig)
1403 {
1404         unsigned int fsize = bpf_classic_proglen(fprog);
1405         struct bpf_prog *fp;
1406         int err;
1407
1408         /* Make sure new filter is there and in the right amounts. */
1409         if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1410                 return -EINVAL;
1411
1412         fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1413         if (!fp)
1414                 return -ENOMEM;
1415
1416         if (copy_from_user(fp->insns, fprog->filter, fsize)) {
1417                 __bpf_prog_free(fp);
1418                 return -EFAULT;
1419         }
1420
1421         fp->len = fprog->len;
1422         fp->orig_prog = NULL;
1423
1424         if (save_orig) {
1425                 err = bpf_prog_store_orig_filter(fp, fprog);
1426                 if (err) {
1427                         __bpf_prog_free(fp);
1428                         return -ENOMEM;
1429                 }
1430         }
1431
1432         /* bpf_prepare_filter() already takes care of freeing
1433          * memory in case something goes wrong.
1434          */
1435         fp = bpf_prepare_filter(fp, trans);
1436         if (IS_ERR(fp))
1437                 return PTR_ERR(fp);
1438
1439         *pfp = fp;
1440         return 0;
1441 }
1442 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user);
1443
1444 void bpf_prog_destroy(struct bpf_prog *fp)
1445 {
1446         __bpf_prog_release(fp);
1447 }
1448 EXPORT_SYMBOL_GPL(bpf_prog_destroy);
1449
1450 static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk)
1451 {
1452         struct sk_filter *fp, *old_fp;
1453
1454         fp = kmalloc(sizeof(*fp), GFP_KERNEL);
1455         if (!fp)
1456                 return -ENOMEM;
1457
1458         fp->prog = prog;
1459
1460         if (!__sk_filter_charge(sk, fp)) {
1461                 kfree(fp);
1462                 return -ENOMEM;
1463         }
1464         refcount_set(&fp->refcnt, 1);
1465
1466         old_fp = rcu_dereference_protected(sk->sk_filter,
1467                                            lockdep_sock_is_held(sk));
1468         rcu_assign_pointer(sk->sk_filter, fp);
1469
1470         if (old_fp)
1471                 sk_filter_uncharge(sk, old_fp);
1472
1473         return 0;
1474 }
1475
1476 static
1477 struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk)
1478 {
1479         unsigned int fsize = bpf_classic_proglen(fprog);
1480         struct bpf_prog *prog;
1481         int err;
1482
1483         if (sock_flag(sk, SOCK_FILTER_LOCKED))
1484                 return ERR_PTR(-EPERM);
1485
1486         /* Make sure new filter is there and in the right amounts. */
1487         if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1488                 return ERR_PTR(-EINVAL);
1489
1490         prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1491         if (!prog)
1492                 return ERR_PTR(-ENOMEM);
1493
1494         if (copy_from_user(prog->insns, fprog->filter, fsize)) {
1495                 __bpf_prog_free(prog);
1496                 return ERR_PTR(-EFAULT);
1497         }
1498
1499         prog->len = fprog->len;
1500
1501         err = bpf_prog_store_orig_filter(prog, fprog);
1502         if (err) {
1503                 __bpf_prog_free(prog);
1504                 return ERR_PTR(-ENOMEM);
1505         }
1506
1507         /* bpf_prepare_filter() already takes care of freeing
1508          * memory in case something goes wrong.
1509          */
1510         return bpf_prepare_filter(prog, NULL);
1511 }
1512
1513 /**
1514  *      sk_attach_filter - attach a socket filter
1515  *      @fprog: the filter program
1516  *      @sk: the socket to use
1517  *
1518  * Attach the user's filter code. We first run some sanity checks on
1519  * it to make sure it does not explode on us later. If an error
1520  * occurs or there is insufficient memory for the filter a negative
1521  * errno code is returned. On success the return is zero.
1522  */
1523 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
1524 {
1525         struct bpf_prog *prog = __get_filter(fprog, sk);
1526         int err;
1527
1528         if (IS_ERR(prog))
1529                 return PTR_ERR(prog);
1530
1531         err = __sk_attach_prog(prog, sk);
1532         if (err < 0) {
1533                 __bpf_prog_release(prog);
1534                 return err;
1535         }
1536
1537         return 0;
1538 }
1539 EXPORT_SYMBOL_GPL(sk_attach_filter);
1540
1541 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk)
1542 {
1543         struct bpf_prog *prog = __get_filter(fprog, sk);
1544         int err;
1545
1546         if (IS_ERR(prog))
1547                 return PTR_ERR(prog);
1548
1549         if (bpf_prog_size(prog->len) > sysctl_optmem_max)
1550                 err = -ENOMEM;
1551         else
1552                 err = reuseport_attach_prog(sk, prog);
1553
1554         if (err)
1555                 __bpf_prog_release(prog);
1556
1557         return err;
1558 }
1559
1560 static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk)
1561 {
1562         if (sock_flag(sk, SOCK_FILTER_LOCKED))
1563                 return ERR_PTR(-EPERM);
1564
1565         return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
1566 }
1567
1568 int sk_attach_bpf(u32 ufd, struct sock *sk)
1569 {
1570         struct bpf_prog *prog = __get_bpf(ufd, sk);
1571         int err;
1572
1573         if (IS_ERR(prog))
1574                 return PTR_ERR(prog);
1575
1576         err = __sk_attach_prog(prog, sk);
1577         if (err < 0) {
1578                 bpf_prog_put(prog);
1579                 return err;
1580         }
1581
1582         return 0;
1583 }
1584
1585 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk)
1586 {
1587         struct bpf_prog *prog;
1588         int err;
1589
1590         if (sock_flag(sk, SOCK_FILTER_LOCKED))
1591                 return -EPERM;
1592
1593         prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
1594         if (PTR_ERR(prog) == -EINVAL)
1595                 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT);
1596         if (IS_ERR(prog))
1597                 return PTR_ERR(prog);
1598
1599         if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) {
1600                 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER
1601                  * bpf prog (e.g. sockmap).  It depends on the
1602                  * limitation imposed by bpf_prog_load().
1603                  * Hence, sysctl_optmem_max is not checked.
1604                  */
1605                 if ((sk->sk_type != SOCK_STREAM &&
1606                      sk->sk_type != SOCK_DGRAM) ||
1607                     (sk->sk_protocol != IPPROTO_UDP &&
1608                      sk->sk_protocol != IPPROTO_TCP) ||
1609                     (sk->sk_family != AF_INET &&
1610                      sk->sk_family != AF_INET6)) {
1611                         err = -ENOTSUPP;
1612                         goto err_prog_put;
1613                 }
1614         } else {
1615                 /* BPF_PROG_TYPE_SOCKET_FILTER */
1616                 if (bpf_prog_size(prog->len) > sysctl_optmem_max) {
1617                         err = -ENOMEM;
1618                         goto err_prog_put;
1619                 }
1620         }
1621
1622         err = reuseport_attach_prog(sk, prog);
1623 err_prog_put:
1624         if (err)
1625                 bpf_prog_put(prog);
1626
1627         return err;
1628 }
1629
1630 void sk_reuseport_prog_free(struct bpf_prog *prog)
1631 {
1632         if (!prog)
1633                 return;
1634
1635         if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT)
1636                 bpf_prog_put(prog);
1637         else
1638                 bpf_prog_destroy(prog);
1639 }
1640
1641 struct bpf_scratchpad {
1642         union {
1643                 __be32 diff[MAX_BPF_STACK / sizeof(__be32)];
1644                 u8     buff[MAX_BPF_STACK];
1645         };
1646 };
1647
1648 static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp);
1649
1650 static inline int __bpf_try_make_writable(struct sk_buff *skb,
1651                                           unsigned int write_len)
1652 {
1653         return skb_ensure_writable(skb, write_len);
1654 }
1655
1656 static inline int bpf_try_make_writable(struct sk_buff *skb,
1657                                         unsigned int write_len)
1658 {
1659         int err = __bpf_try_make_writable(skb, write_len);
1660
1661         bpf_compute_data_pointers(skb);
1662         return err;
1663 }
1664
1665 static int bpf_try_make_head_writable(struct sk_buff *skb)
1666 {
1667         return bpf_try_make_writable(skb, skb_headlen(skb));
1668 }
1669
1670 static inline void bpf_push_mac_rcsum(struct sk_buff *skb)
1671 {
1672         if (skb_at_tc_ingress(skb))
1673                 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1674 }
1675
1676 static inline void bpf_pull_mac_rcsum(struct sk_buff *skb)
1677 {
1678         if (skb_at_tc_ingress(skb))
1679                 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1680 }
1681
1682 BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset,
1683            const void *, from, u32, len, u64, flags)
1684 {
1685         void *ptr;
1686
1687         if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH)))
1688                 return -EINVAL;
1689         if (unlikely(offset > 0xffff))
1690                 return -EFAULT;
1691         if (unlikely(bpf_try_make_writable(skb, offset + len)))
1692                 return -EFAULT;
1693
1694         ptr = skb->data + offset;
1695         if (flags & BPF_F_RECOMPUTE_CSUM)
1696                 __skb_postpull_rcsum(skb, ptr, len, offset);
1697
1698         memcpy(ptr, from, len);
1699
1700         if (flags & BPF_F_RECOMPUTE_CSUM)
1701                 __skb_postpush_rcsum(skb, ptr, len, offset);
1702         if (flags & BPF_F_INVALIDATE_HASH)
1703                 skb_clear_hash(skb);
1704
1705         return 0;
1706 }
1707
1708 static const struct bpf_func_proto bpf_skb_store_bytes_proto = {
1709         .func           = bpf_skb_store_bytes,
1710         .gpl_only       = false,
1711         .ret_type       = RET_INTEGER,
1712         .arg1_type      = ARG_PTR_TO_CTX,
1713         .arg2_type      = ARG_ANYTHING,
1714         .arg3_type      = ARG_PTR_TO_MEM,
1715         .arg4_type      = ARG_CONST_SIZE,
1716         .arg5_type      = ARG_ANYTHING,
1717 };
1718
1719 BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset,
1720            void *, to, u32, len)
1721 {
1722         void *ptr;
1723
1724         if (unlikely(offset > 0xffff))
1725                 goto err_clear;
1726
1727         ptr = skb_header_pointer(skb, offset, len, to);
1728         if (unlikely(!ptr))
1729                 goto err_clear;
1730         if (ptr != to)
1731                 memcpy(to, ptr, len);
1732
1733         return 0;
1734 err_clear:
1735         memset(to, 0, len);
1736         return -EFAULT;
1737 }
1738
1739 static const struct bpf_func_proto bpf_skb_load_bytes_proto = {
1740         .func           = bpf_skb_load_bytes,
1741         .gpl_only       = false,
1742         .ret_type       = RET_INTEGER,
1743         .arg1_type      = ARG_PTR_TO_CTX,
1744         .arg2_type      = ARG_ANYTHING,
1745         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
1746         .arg4_type      = ARG_CONST_SIZE,
1747 };
1748
1749 BPF_CALL_4(bpf_flow_dissector_load_bytes,
1750            const struct bpf_flow_dissector *, ctx, u32, offset,
1751            void *, to, u32, len)
1752 {
1753         void *ptr;
1754
1755         if (unlikely(offset > 0xffff))
1756                 goto err_clear;
1757
1758         if (unlikely(!ctx->skb))
1759                 goto err_clear;
1760
1761         ptr = skb_header_pointer(ctx->skb, offset, len, to);
1762         if (unlikely(!ptr))
1763                 goto err_clear;
1764         if (ptr != to)
1765                 memcpy(to, ptr, len);
1766
1767         return 0;
1768 err_clear:
1769         memset(to, 0, len);
1770         return -EFAULT;
1771 }
1772
1773 static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto = {
1774         .func           = bpf_flow_dissector_load_bytes,
1775         .gpl_only       = false,
1776         .ret_type       = RET_INTEGER,
1777         .arg1_type      = ARG_PTR_TO_CTX,
1778         .arg2_type      = ARG_ANYTHING,
1779         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
1780         .arg4_type      = ARG_CONST_SIZE,
1781 };
1782
1783 BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb,
1784            u32, offset, void *, to, u32, len, u32, start_header)
1785 {
1786         u8 *end = skb_tail_pointer(skb);
1787         u8 *start, *ptr;
1788
1789         if (unlikely(offset > 0xffff))
1790                 goto err_clear;
1791
1792         switch (start_header) {
1793         case BPF_HDR_START_MAC:
1794                 if (unlikely(!skb_mac_header_was_set(skb)))
1795                         goto err_clear;
1796                 start = skb_mac_header(skb);
1797                 break;
1798         case BPF_HDR_START_NET:
1799                 start = skb_network_header(skb);
1800                 break;
1801         default:
1802                 goto err_clear;
1803         }
1804
1805         ptr = start + offset;
1806
1807         if (likely(ptr + len <= end)) {
1808                 memcpy(to, ptr, len);
1809                 return 0;
1810         }
1811
1812 err_clear:
1813         memset(to, 0, len);
1814         return -EFAULT;
1815 }
1816
1817 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = {
1818         .func           = bpf_skb_load_bytes_relative,
1819         .gpl_only       = false,
1820         .ret_type       = RET_INTEGER,
1821         .arg1_type      = ARG_PTR_TO_CTX,
1822         .arg2_type      = ARG_ANYTHING,
1823         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
1824         .arg4_type      = ARG_CONST_SIZE,
1825         .arg5_type      = ARG_ANYTHING,
1826 };
1827
1828 BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len)
1829 {
1830         /* Idea is the following: should the needed direct read/write
1831          * test fail during runtime, we can pull in more data and redo
1832          * again, since implicitly, we invalidate previous checks here.
1833          *
1834          * Or, since we know how much we need to make read/writeable,
1835          * this can be done once at the program beginning for direct
1836          * access case. By this we overcome limitations of only current
1837          * headroom being accessible.
1838          */
1839         return bpf_try_make_writable(skb, len ? : skb_headlen(skb));
1840 }
1841
1842 static const struct bpf_func_proto bpf_skb_pull_data_proto = {
1843         .func           = bpf_skb_pull_data,
1844         .gpl_only       = false,
1845         .ret_type       = RET_INTEGER,
1846         .arg1_type      = ARG_PTR_TO_CTX,
1847         .arg2_type      = ARG_ANYTHING,
1848 };
1849
1850 BPF_CALL_1(bpf_sk_fullsock, struct sock *, sk)
1851 {
1852         return sk_fullsock(sk) ? (unsigned long)sk : (unsigned long)NULL;
1853 }
1854
1855 static const struct bpf_func_proto bpf_sk_fullsock_proto = {
1856         .func           = bpf_sk_fullsock,
1857         .gpl_only       = false,
1858         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
1859         .arg1_type      = ARG_PTR_TO_SOCK_COMMON,
1860 };
1861
1862 static inline int sk_skb_try_make_writable(struct sk_buff *skb,
1863                                            unsigned int write_len)
1864 {
1865         int err = __bpf_try_make_writable(skb, write_len);
1866
1867         bpf_compute_data_end_sk_skb(skb);
1868         return err;
1869 }
1870
1871 BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len)
1872 {
1873         /* Idea is the following: should the needed direct read/write
1874          * test fail during runtime, we can pull in more data and redo
1875          * again, since implicitly, we invalidate previous checks here.
1876          *
1877          * Or, since we know how much we need to make read/writeable,
1878          * this can be done once at the program beginning for direct
1879          * access case. By this we overcome limitations of only current
1880          * headroom being accessible.
1881          */
1882         return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb));
1883 }
1884
1885 static const struct bpf_func_proto sk_skb_pull_data_proto = {
1886         .func           = sk_skb_pull_data,
1887         .gpl_only       = false,
1888         .ret_type       = RET_INTEGER,
1889         .arg1_type      = ARG_PTR_TO_CTX,
1890         .arg2_type      = ARG_ANYTHING,
1891 };
1892
1893 BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset,
1894            u64, from, u64, to, u64, flags)
1895 {
1896         __sum16 *ptr;
1897
1898         if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK)))
1899                 return -EINVAL;
1900         if (unlikely(offset > 0xffff || offset & 1))
1901                 return -EFAULT;
1902         if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
1903                 return -EFAULT;
1904
1905         ptr = (__sum16 *)(skb->data + offset);
1906         switch (flags & BPF_F_HDR_FIELD_MASK) {
1907         case 0:
1908                 if (unlikely(from != 0))
1909                         return -EINVAL;
1910
1911                 csum_replace_by_diff(ptr, to);
1912                 break;
1913         case 2:
1914                 csum_replace2(ptr, from, to);
1915                 break;
1916         case 4:
1917                 csum_replace4(ptr, from, to);
1918                 break;
1919         default:
1920                 return -EINVAL;
1921         }
1922
1923         return 0;
1924 }
1925
1926 static const struct bpf_func_proto bpf_l3_csum_replace_proto = {
1927         .func           = bpf_l3_csum_replace,
1928         .gpl_only       = false,
1929         .ret_type       = RET_INTEGER,
1930         .arg1_type      = ARG_PTR_TO_CTX,
1931         .arg2_type      = ARG_ANYTHING,
1932         .arg3_type      = ARG_ANYTHING,
1933         .arg4_type      = ARG_ANYTHING,
1934         .arg5_type      = ARG_ANYTHING,
1935 };
1936
1937 BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset,
1938            u64, from, u64, to, u64, flags)
1939 {
1940         bool is_pseudo = flags & BPF_F_PSEUDO_HDR;
1941         bool is_mmzero = flags & BPF_F_MARK_MANGLED_0;
1942         bool do_mforce = flags & BPF_F_MARK_ENFORCE;
1943         __sum16 *ptr;
1944
1945         if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE |
1946                                BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK)))
1947                 return -EINVAL;
1948         if (unlikely(offset > 0xffff || offset & 1))
1949                 return -EFAULT;
1950         if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
1951                 return -EFAULT;
1952
1953         ptr = (__sum16 *)(skb->data + offset);
1954         if (is_mmzero && !do_mforce && !*ptr)
1955                 return 0;
1956
1957         switch (flags & BPF_F_HDR_FIELD_MASK) {
1958         case 0:
1959                 if (unlikely(from != 0))
1960                         return -EINVAL;
1961
1962                 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo);
1963                 break;
1964         case 2:
1965                 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo);
1966                 break;
1967         case 4:
1968                 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo);
1969                 break;
1970         default:
1971                 return -EINVAL;
1972         }
1973
1974         if (is_mmzero && !*ptr)
1975                 *ptr = CSUM_MANGLED_0;
1976         return 0;
1977 }
1978
1979 static const struct bpf_func_proto bpf_l4_csum_replace_proto = {
1980         .func           = bpf_l4_csum_replace,
1981         .gpl_only       = false,
1982         .ret_type       = RET_INTEGER,
1983         .arg1_type      = ARG_PTR_TO_CTX,
1984         .arg2_type      = ARG_ANYTHING,
1985         .arg3_type      = ARG_ANYTHING,
1986         .arg4_type      = ARG_ANYTHING,
1987         .arg5_type      = ARG_ANYTHING,
1988 };
1989
1990 BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size,
1991            __be32 *, to, u32, to_size, __wsum, seed)
1992 {
1993         struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp);
1994         u32 diff_size = from_size + to_size;
1995         int i, j = 0;
1996
1997         /* This is quite flexible, some examples:
1998          *
1999          * from_size == 0, to_size > 0,  seed := csum --> pushing data
2000          * from_size > 0,  to_size == 0, seed := csum --> pulling data
2001          * from_size > 0,  to_size > 0,  seed := 0    --> diffing data
2002          *
2003          * Even for diffing, from_size and to_size don't need to be equal.
2004          */
2005         if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) ||
2006                      diff_size > sizeof(sp->diff)))
2007                 return -EINVAL;
2008
2009         for (i = 0; i < from_size / sizeof(__be32); i++, j++)
2010                 sp->diff[j] = ~from[i];
2011         for (i = 0; i <   to_size / sizeof(__be32); i++, j++)
2012                 sp->diff[j] = to[i];
2013
2014         return csum_partial(sp->diff, diff_size, seed);
2015 }
2016
2017 static const struct bpf_func_proto bpf_csum_diff_proto = {
2018         .func           = bpf_csum_diff,
2019         .gpl_only       = false,
2020         .pkt_access     = true,
2021         .ret_type       = RET_INTEGER,
2022         .arg1_type      = ARG_PTR_TO_MEM_OR_NULL,
2023         .arg2_type      = ARG_CONST_SIZE_OR_ZERO,
2024         .arg3_type      = ARG_PTR_TO_MEM_OR_NULL,
2025         .arg4_type      = ARG_CONST_SIZE_OR_ZERO,
2026         .arg5_type      = ARG_ANYTHING,
2027 };
2028
2029 BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum)
2030 {
2031         /* The interface is to be used in combination with bpf_csum_diff()
2032          * for direct packet writes. csum rotation for alignment as well
2033          * as emulating csum_sub() can be done from the eBPF program.
2034          */
2035         if (skb->ip_summed == CHECKSUM_COMPLETE)
2036                 return (skb->csum = csum_add(skb->csum, csum));
2037
2038         return -ENOTSUPP;
2039 }
2040
2041 static const struct bpf_func_proto bpf_csum_update_proto = {
2042         .func           = bpf_csum_update,
2043         .gpl_only       = false,
2044         .ret_type       = RET_INTEGER,
2045         .arg1_type      = ARG_PTR_TO_CTX,
2046         .arg2_type      = ARG_ANYTHING,
2047 };
2048
2049 BPF_CALL_2(bpf_csum_level, struct sk_buff *, skb, u64, level)
2050 {
2051         /* The interface is to be used in combination with bpf_skb_adjust_room()
2052          * for encap/decap of packet headers when BPF_F_ADJ_ROOM_NO_CSUM_RESET
2053          * is passed as flags, for example.
2054          */
2055         switch (level) {
2056         case BPF_CSUM_LEVEL_INC:
2057                 __skb_incr_checksum_unnecessary(skb);
2058                 break;
2059         case BPF_CSUM_LEVEL_DEC:
2060                 __skb_decr_checksum_unnecessary(skb);
2061                 break;
2062         case BPF_CSUM_LEVEL_RESET:
2063                 __skb_reset_checksum_unnecessary(skb);
2064                 break;
2065         case BPF_CSUM_LEVEL_QUERY:
2066                 return skb->ip_summed == CHECKSUM_UNNECESSARY ?
2067                        skb->csum_level : -EACCES;
2068         default:
2069                 return -EINVAL;
2070         }
2071
2072         return 0;
2073 }
2074
2075 static const struct bpf_func_proto bpf_csum_level_proto = {
2076         .func           = bpf_csum_level,
2077         .gpl_only       = false,
2078         .ret_type       = RET_INTEGER,
2079         .arg1_type      = ARG_PTR_TO_CTX,
2080         .arg2_type      = ARG_ANYTHING,
2081 };
2082
2083 static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb)
2084 {
2085         return dev_forward_skb(dev, skb);
2086 }
2087
2088 static inline int __bpf_rx_skb_no_mac(struct net_device *dev,
2089                                       struct sk_buff *skb)
2090 {
2091         int ret = ____dev_forward_skb(dev, skb);
2092
2093         if (likely(!ret)) {
2094                 skb->dev = dev;
2095                 ret = netif_rx(skb);
2096         }
2097
2098         return ret;
2099 }
2100
2101 static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb)
2102 {
2103         int ret;
2104
2105         if (dev_xmit_recursion()) {
2106                 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2107                 kfree_skb(skb);
2108                 return -ENETDOWN;
2109         }
2110
2111         skb->dev = dev;
2112         skb->tstamp = 0;
2113
2114         dev_xmit_recursion_inc();
2115         ret = dev_queue_xmit(skb);
2116         dev_xmit_recursion_dec();
2117
2118         return ret;
2119 }
2120
2121 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev,
2122                                  u32 flags)
2123 {
2124         unsigned int mlen = skb_network_offset(skb);
2125
2126         if (mlen) {
2127                 __skb_pull(skb, mlen);
2128
2129                 /* At ingress, the mac header has already been pulled once.
2130                  * At egress, skb_pospull_rcsum has to be done in case that
2131                  * the skb is originated from ingress (i.e. a forwarded skb)
2132                  * to ensure that rcsum starts at net header.
2133                  */
2134                 if (!skb_at_tc_ingress(skb))
2135                         skb_postpull_rcsum(skb, skb_mac_header(skb), mlen);
2136         }
2137         skb_pop_mac_header(skb);
2138         skb_reset_mac_len(skb);
2139         return flags & BPF_F_INGRESS ?
2140                __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb);
2141 }
2142
2143 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev,
2144                                  u32 flags)
2145 {
2146         /* Verify that a link layer header is carried */
2147         if (unlikely(skb->mac_header >= skb->network_header)) {
2148                 kfree_skb(skb);
2149                 return -ERANGE;
2150         }
2151
2152         bpf_push_mac_rcsum(skb);
2153         return flags & BPF_F_INGRESS ?
2154                __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb);
2155 }
2156
2157 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev,
2158                           u32 flags)
2159 {
2160         if (dev_is_mac_header_xmit(dev))
2161                 return __bpf_redirect_common(skb, dev, flags);
2162         else
2163                 return __bpf_redirect_no_mac(skb, dev, flags);
2164 }
2165
2166 #if IS_ENABLED(CONFIG_IPV6)
2167 static int bpf_out_neigh_v6(struct net *net, struct sk_buff *skb)
2168 {
2169         struct dst_entry *dst = skb_dst(skb);
2170         struct net_device *dev = dst->dev;
2171         u32 hh_len = LL_RESERVED_SPACE(dev);
2172         const struct in6_addr *nexthop;
2173         struct neighbour *neigh;
2174
2175         if (dev_xmit_recursion()) {
2176                 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2177                 goto out_drop;
2178         }
2179
2180         skb->dev = dev;
2181         skb->tstamp = 0;
2182
2183         if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
2184                 struct sk_buff *skb2;
2185
2186                 skb2 = skb_realloc_headroom(skb, hh_len);
2187                 if (unlikely(!skb2)) {
2188                         kfree_skb(skb);
2189                         return -ENOMEM;
2190                 }
2191                 if (skb->sk)
2192                         skb_set_owner_w(skb2, skb->sk);
2193                 consume_skb(skb);
2194                 skb = skb2;
2195         }
2196
2197         rcu_read_lock_bh();
2198         nexthop = rt6_nexthop(container_of(dst, struct rt6_info, dst),
2199                               &ipv6_hdr(skb)->daddr);
2200         neigh = ip_neigh_gw6(dev, nexthop);
2201         if (likely(!IS_ERR(neigh))) {
2202                 int ret;
2203
2204                 sock_confirm_neigh(skb, neigh);
2205                 dev_xmit_recursion_inc();
2206                 ret = neigh_output(neigh, skb, false);
2207                 dev_xmit_recursion_dec();
2208                 rcu_read_unlock_bh();
2209                 return ret;
2210         }
2211         rcu_read_unlock_bh();
2212         IP6_INC_STATS(dev_net(dst->dev),
2213                       ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
2214 out_drop:
2215         kfree_skb(skb);
2216         return -ENETDOWN;
2217 }
2218
2219 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev)
2220 {
2221         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
2222         struct net *net = dev_net(dev);
2223         int err, ret = NET_XMIT_DROP;
2224         struct dst_entry *dst;
2225         struct flowi6 fl6 = {
2226                 .flowi6_flags   = FLOWI_FLAG_ANYSRC,
2227                 .flowi6_mark    = skb->mark,
2228                 .flowlabel      = ip6_flowinfo(ip6h),
2229                 .flowi6_oif     = dev->ifindex,
2230                 .flowi6_proto   = ip6h->nexthdr,
2231                 .daddr          = ip6h->daddr,
2232                 .saddr          = ip6h->saddr,
2233         };
2234
2235         dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL);
2236         if (IS_ERR(dst))
2237                 goto out_drop;
2238
2239         skb_dst_set(skb, dst);
2240
2241         err = bpf_out_neigh_v6(net, skb);
2242         if (unlikely(net_xmit_eval(err)))
2243                 dev->stats.tx_errors++;
2244         else
2245                 ret = NET_XMIT_SUCCESS;
2246         goto out_xmit;
2247 out_drop:
2248         dev->stats.tx_errors++;
2249         kfree_skb(skb);
2250 out_xmit:
2251         return ret;
2252 }
2253 #else
2254 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev)
2255 {
2256         kfree_skb(skb);
2257         return NET_XMIT_DROP;
2258 }
2259 #endif /* CONFIG_IPV6 */
2260
2261 #if IS_ENABLED(CONFIG_INET)
2262 static int bpf_out_neigh_v4(struct net *net, struct sk_buff *skb)
2263 {
2264         struct dst_entry *dst = skb_dst(skb);
2265         struct rtable *rt = container_of(dst, struct rtable, dst);
2266         struct net_device *dev = dst->dev;
2267         u32 hh_len = LL_RESERVED_SPACE(dev);
2268         struct neighbour *neigh;
2269         bool is_v6gw = false;
2270
2271         if (dev_xmit_recursion()) {
2272                 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2273                 goto out_drop;
2274         }
2275
2276         skb->dev = dev;
2277         skb->tstamp = 0;
2278
2279         if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
2280                 struct sk_buff *skb2;
2281
2282                 skb2 = skb_realloc_headroom(skb, hh_len);
2283                 if (unlikely(!skb2)) {
2284                         kfree_skb(skb);
2285                         return -ENOMEM;
2286                 }
2287                 if (skb->sk)
2288                         skb_set_owner_w(skb2, skb->sk);
2289                 consume_skb(skb);
2290                 skb = skb2;
2291         }
2292
2293         rcu_read_lock_bh();
2294         neigh = ip_neigh_for_gw(rt, skb, &is_v6gw);
2295         if (likely(!IS_ERR(neigh))) {
2296                 int ret;
2297
2298                 sock_confirm_neigh(skb, neigh);
2299                 dev_xmit_recursion_inc();
2300                 ret = neigh_output(neigh, skb, is_v6gw);
2301                 dev_xmit_recursion_dec();
2302                 rcu_read_unlock_bh();
2303                 return ret;
2304         }
2305         rcu_read_unlock_bh();
2306 out_drop:
2307         kfree_skb(skb);
2308         return -ENETDOWN;
2309 }
2310
2311 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev)
2312 {
2313         const struct iphdr *ip4h = ip_hdr(skb);
2314         struct net *net = dev_net(dev);
2315         int err, ret = NET_XMIT_DROP;
2316         struct rtable *rt;
2317         struct flowi4 fl4 = {
2318                 .flowi4_flags   = FLOWI_FLAG_ANYSRC,
2319                 .flowi4_mark    = skb->mark,
2320                 .flowi4_tos     = RT_TOS(ip4h->tos),
2321                 .flowi4_oif     = dev->ifindex,
2322                 .flowi4_proto   = ip4h->protocol,
2323                 .daddr          = ip4h->daddr,
2324                 .saddr          = ip4h->saddr,
2325         };
2326
2327         rt = ip_route_output_flow(net, &fl4, NULL);
2328         if (IS_ERR(rt))
2329                 goto out_drop;
2330         if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
2331                 ip_rt_put(rt);
2332                 goto out_drop;
2333         }
2334
2335         skb_dst_set(skb, &rt->dst);
2336
2337         err = bpf_out_neigh_v4(net, skb);
2338         if (unlikely(net_xmit_eval(err)))
2339                 dev->stats.tx_errors++;
2340         else
2341                 ret = NET_XMIT_SUCCESS;
2342         goto out_xmit;
2343 out_drop:
2344         dev->stats.tx_errors++;
2345         kfree_skb(skb);
2346 out_xmit:
2347         return ret;
2348 }
2349 #else
2350 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev)
2351 {
2352         kfree_skb(skb);
2353         return NET_XMIT_DROP;
2354 }
2355 #endif /* CONFIG_INET */
2356
2357 static int __bpf_redirect_neigh(struct sk_buff *skb, struct net_device *dev)
2358 {
2359         struct ethhdr *ethh = eth_hdr(skb);
2360
2361         if (unlikely(skb->mac_header >= skb->network_header))
2362                 goto out;
2363         bpf_push_mac_rcsum(skb);
2364         if (is_multicast_ether_addr(ethh->h_dest))
2365                 goto out;
2366
2367         skb_pull(skb, sizeof(*ethh));
2368         skb_unset_mac_header(skb);
2369         skb_reset_network_header(skb);
2370
2371         if (skb->protocol == htons(ETH_P_IP))
2372                 return __bpf_redirect_neigh_v4(skb, dev);
2373         else if (skb->protocol == htons(ETH_P_IPV6))
2374                 return __bpf_redirect_neigh_v6(skb, dev);
2375 out:
2376         kfree_skb(skb);
2377         return -ENOTSUPP;
2378 }
2379
2380 /* Internal, non-exposed redirect flags. */
2381 enum {
2382         BPF_F_NEIGH = (1ULL << 1),
2383 #define BPF_F_REDIRECT_INTERNAL (BPF_F_NEIGH)
2384 };
2385
2386 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags)
2387 {
2388         struct net_device *dev;
2389         struct sk_buff *clone;
2390         int ret;
2391
2392         if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL)))
2393                 return -EINVAL;
2394
2395         dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex);
2396         if (unlikely(!dev))
2397                 return -EINVAL;
2398
2399         clone = skb_clone(skb, GFP_ATOMIC);
2400         if (unlikely(!clone))
2401                 return -ENOMEM;
2402
2403         /* For direct write, we need to keep the invariant that the skbs
2404          * we're dealing with need to be uncloned. Should uncloning fail
2405          * here, we need to free the just generated clone to unclone once
2406          * again.
2407          */
2408         ret = bpf_try_make_head_writable(skb);
2409         if (unlikely(ret)) {
2410                 kfree_skb(clone);
2411                 return -ENOMEM;
2412         }
2413
2414         return __bpf_redirect(clone, dev, flags);
2415 }
2416
2417 static const struct bpf_func_proto bpf_clone_redirect_proto = {
2418         .func           = bpf_clone_redirect,
2419         .gpl_only       = false,
2420         .ret_type       = RET_INTEGER,
2421         .arg1_type      = ARG_PTR_TO_CTX,
2422         .arg2_type      = ARG_ANYTHING,
2423         .arg3_type      = ARG_ANYTHING,
2424 };
2425
2426 DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info);
2427 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info);
2428
2429 int skb_do_redirect(struct sk_buff *skb)
2430 {
2431         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
2432         struct net_device *dev;
2433         u32 flags = ri->flags;
2434
2435         dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->tgt_index);
2436         ri->tgt_index = 0;
2437         if (unlikely(!dev)) {
2438                 kfree_skb(skb);
2439                 return -EINVAL;
2440         }
2441
2442         return flags & BPF_F_NEIGH ?
2443                __bpf_redirect_neigh(skb, dev) :
2444                __bpf_redirect(skb, dev, flags);
2445 }
2446
2447 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags)
2448 {
2449         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
2450
2451         if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL)))
2452                 return TC_ACT_SHOT;
2453
2454         ri->flags = flags;
2455         ri->tgt_index = ifindex;
2456
2457         return TC_ACT_REDIRECT;
2458 }
2459
2460 static const struct bpf_func_proto bpf_redirect_proto = {
2461         .func           = bpf_redirect,
2462         .gpl_only       = false,
2463         .ret_type       = RET_INTEGER,
2464         .arg1_type      = ARG_ANYTHING,
2465         .arg2_type      = ARG_ANYTHING,
2466 };
2467
2468 BPF_CALL_2(bpf_redirect_neigh, u32, ifindex, u64, flags)
2469 {
2470         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
2471
2472         if (unlikely(flags))
2473                 return TC_ACT_SHOT;
2474
2475         ri->flags = BPF_F_NEIGH;
2476         ri->tgt_index = ifindex;
2477
2478         return TC_ACT_REDIRECT;
2479 }
2480
2481 static const struct bpf_func_proto bpf_redirect_neigh_proto = {
2482         .func           = bpf_redirect_neigh,
2483         .gpl_only       = false,
2484         .ret_type       = RET_INTEGER,
2485         .arg1_type      = ARG_ANYTHING,
2486         .arg2_type      = ARG_ANYTHING,
2487 };
2488
2489 BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes)
2490 {
2491         msg->apply_bytes = bytes;
2492         return 0;
2493 }
2494
2495 static const struct bpf_func_proto bpf_msg_apply_bytes_proto = {
2496         .func           = bpf_msg_apply_bytes,
2497         .gpl_only       = false,
2498         .ret_type       = RET_INTEGER,
2499         .arg1_type      = ARG_PTR_TO_CTX,
2500         .arg2_type      = ARG_ANYTHING,
2501 };
2502
2503 BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes)
2504 {
2505         msg->cork_bytes = bytes;
2506         return 0;
2507 }
2508
2509 static const struct bpf_func_proto bpf_msg_cork_bytes_proto = {
2510         .func           = bpf_msg_cork_bytes,
2511         .gpl_only       = false,
2512         .ret_type       = RET_INTEGER,
2513         .arg1_type      = ARG_PTR_TO_CTX,
2514         .arg2_type      = ARG_ANYTHING,
2515 };
2516
2517 BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start,
2518            u32, end, u64, flags)
2519 {
2520         u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start;
2521         u32 first_sge, last_sge, i, shift, bytes_sg_total;
2522         struct scatterlist *sge;
2523         u8 *raw, *to, *from;
2524         struct page *page;
2525
2526         if (unlikely(flags || end <= start))
2527                 return -EINVAL;
2528
2529         /* First find the starting scatterlist element */
2530         i = msg->sg.start;
2531         do {
2532                 offset += len;
2533                 len = sk_msg_elem(msg, i)->length;
2534                 if (start < offset + len)
2535                         break;
2536                 sk_msg_iter_var_next(i);
2537         } while (i != msg->sg.end);
2538
2539         if (unlikely(start >= offset + len))
2540                 return -EINVAL;
2541
2542         first_sge = i;
2543         /* The start may point into the sg element so we need to also
2544          * account for the headroom.
2545          */
2546         bytes_sg_total = start - offset + bytes;
2547         if (!test_bit(i, &msg->sg.copy) && bytes_sg_total <= len)
2548                 goto out;
2549
2550         /* At this point we need to linearize multiple scatterlist
2551          * elements or a single shared page. Either way we need to
2552          * copy into a linear buffer exclusively owned by BPF. Then
2553          * place the buffer in the scatterlist and fixup the original
2554          * entries by removing the entries now in the linear buffer
2555          * and shifting the remaining entries. For now we do not try
2556          * to copy partial entries to avoid complexity of running out
2557          * of sg_entry slots. The downside is reading a single byte
2558          * will copy the entire sg entry.
2559          */
2560         do {
2561                 copy += sk_msg_elem(msg, i)->length;
2562                 sk_msg_iter_var_next(i);
2563                 if (bytes_sg_total <= copy)
2564                         break;
2565         } while (i != msg->sg.end);
2566         last_sge = i;
2567
2568         if (unlikely(bytes_sg_total > copy))
2569                 return -EINVAL;
2570
2571         page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP,
2572                            get_order(copy));
2573         if (unlikely(!page))
2574                 return -ENOMEM;
2575
2576         raw = page_address(page);
2577         i = first_sge;
2578         do {
2579                 sge = sk_msg_elem(msg, i);
2580                 from = sg_virt(sge);
2581                 len = sge->length;
2582                 to = raw + poffset;
2583
2584                 memcpy(to, from, len);
2585                 poffset += len;
2586                 sge->length = 0;
2587                 put_page(sg_page(sge));
2588
2589                 sk_msg_iter_var_next(i);
2590         } while (i != last_sge);
2591
2592         sg_set_page(&msg->sg.data[first_sge], page, copy, 0);
2593
2594         /* To repair sg ring we need to shift entries. If we only
2595          * had a single entry though we can just replace it and
2596          * be done. Otherwise walk the ring and shift the entries.
2597          */
2598         WARN_ON_ONCE(last_sge == first_sge);
2599         shift = last_sge > first_sge ?
2600                 last_sge - first_sge - 1 :
2601                 NR_MSG_FRAG_IDS - first_sge + last_sge - 1;
2602         if (!shift)
2603                 goto out;
2604
2605         i = first_sge;
2606         sk_msg_iter_var_next(i);
2607         do {
2608                 u32 move_from;
2609
2610                 if (i + shift >= NR_MSG_FRAG_IDS)
2611                         move_from = i + shift - NR_MSG_FRAG_IDS;
2612                 else
2613                         move_from = i + shift;
2614                 if (move_from == msg->sg.end)
2615                         break;
2616
2617                 msg->sg.data[i] = msg->sg.data[move_from];
2618                 msg->sg.data[move_from].length = 0;
2619                 msg->sg.data[move_from].page_link = 0;
2620                 msg->sg.data[move_from].offset = 0;
2621                 sk_msg_iter_var_next(i);
2622         } while (1);
2623
2624         msg->sg.end = msg->sg.end - shift > msg->sg.end ?
2625                       msg->sg.end - shift + NR_MSG_FRAG_IDS :
2626                       msg->sg.end - shift;
2627 out:
2628         msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset;
2629         msg->data_end = msg->data + bytes;
2630         return 0;
2631 }
2632
2633 static const struct bpf_func_proto bpf_msg_pull_data_proto = {
2634         .func           = bpf_msg_pull_data,
2635         .gpl_only       = false,
2636         .ret_type       = RET_INTEGER,
2637         .arg1_type      = ARG_PTR_TO_CTX,
2638         .arg2_type      = ARG_ANYTHING,
2639         .arg3_type      = ARG_ANYTHING,
2640         .arg4_type      = ARG_ANYTHING,
2641 };
2642
2643 BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start,
2644            u32, len, u64, flags)
2645 {
2646         struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge;
2647         u32 new, i = 0, l = 0, space, copy = 0, offset = 0;
2648         u8 *raw, *to, *from;
2649         struct page *page;
2650
2651         if (unlikely(flags))
2652                 return -EINVAL;
2653
2654         /* First find the starting scatterlist element */
2655         i = msg->sg.start;
2656         do {
2657                 offset += l;
2658                 l = sk_msg_elem(msg, i)->length;
2659
2660                 if (start < offset + l)
2661                         break;
2662                 sk_msg_iter_var_next(i);
2663         } while (i != msg->sg.end);
2664
2665         if (start >= offset + l)
2666                 return -EINVAL;
2667
2668         space = MAX_MSG_FRAGS - sk_msg_elem_used(msg);
2669
2670         /* If no space available will fallback to copy, we need at
2671          * least one scatterlist elem available to push data into
2672          * when start aligns to the beginning of an element or two
2673          * when it falls inside an element. We handle the start equals
2674          * offset case because its the common case for inserting a
2675          * header.
2676          */
2677         if (!space || (space == 1 && start != offset))
2678                 copy = msg->sg.data[i].length;
2679
2680         page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP,
2681                            get_order(copy + len));
2682         if (unlikely(!page))
2683                 return -ENOMEM;
2684
2685         if (copy) {
2686                 int front, back;
2687
2688                 raw = page_address(page);
2689
2690                 psge = sk_msg_elem(msg, i);
2691                 front = start - offset;
2692                 back = psge->length - front;
2693                 from = sg_virt(psge);
2694
2695                 if (front)
2696                         memcpy(raw, from, front);
2697
2698                 if (back) {
2699                         from += front;
2700                         to = raw + front + len;
2701
2702                         memcpy(to, from, back);
2703                 }
2704
2705                 put_page(sg_page(psge));
2706         } else if (start - offset) {
2707                 psge = sk_msg_elem(msg, i);
2708                 rsge = sk_msg_elem_cpy(msg, i);
2709
2710                 psge->length = start - offset;
2711                 rsge.length -= psge->length;
2712                 rsge.offset += start;
2713
2714                 sk_msg_iter_var_next(i);
2715                 sg_unmark_end(psge);
2716                 sg_unmark_end(&rsge);
2717                 sk_msg_iter_next(msg, end);
2718         }
2719
2720         /* Slot(s) to place newly allocated data */
2721         new = i;
2722
2723         /* Shift one or two slots as needed */
2724         if (!copy) {
2725                 sge = sk_msg_elem_cpy(msg, i);
2726
2727                 sk_msg_iter_var_next(i);
2728                 sg_unmark_end(&sge);
2729                 sk_msg_iter_next(msg, end);
2730
2731                 nsge = sk_msg_elem_cpy(msg, i);
2732                 if (rsge.length) {
2733                         sk_msg_iter_var_next(i);
2734                         nnsge = sk_msg_elem_cpy(msg, i);
2735                 }
2736
2737                 while (i != msg->sg.end) {
2738                         msg->sg.data[i] = sge;
2739                         sge = nsge;
2740                         sk_msg_iter_var_next(i);
2741                         if (rsge.length) {
2742                                 nsge = nnsge;
2743                                 nnsge = sk_msg_elem_cpy(msg, i);
2744                         } else {
2745                                 nsge = sk_msg_elem_cpy(msg, i);
2746                         }
2747                 }
2748         }
2749
2750         /* Place newly allocated data buffer */
2751         sk_mem_charge(msg->sk, len);
2752         msg->sg.size += len;
2753         __clear_bit(new, &msg->sg.copy);
2754         sg_set_page(&msg->sg.data[new], page, len + copy, 0);
2755         if (rsge.length) {
2756                 get_page(sg_page(&rsge));
2757                 sk_msg_iter_var_next(new);
2758                 msg->sg.data[new] = rsge;
2759         }
2760
2761         sk_msg_compute_data_pointers(msg);
2762         return 0;
2763 }
2764
2765 static const struct bpf_func_proto bpf_msg_push_data_proto = {
2766         .func           = bpf_msg_push_data,
2767         .gpl_only       = false,
2768         .ret_type       = RET_INTEGER,
2769         .arg1_type      = ARG_PTR_TO_CTX,
2770         .arg2_type      = ARG_ANYTHING,
2771         .arg3_type      = ARG_ANYTHING,
2772         .arg4_type      = ARG_ANYTHING,
2773 };
2774
2775 static void sk_msg_shift_left(struct sk_msg *msg, int i)
2776 {
2777         int prev;
2778
2779         do {
2780                 prev = i;
2781                 sk_msg_iter_var_next(i);
2782                 msg->sg.data[prev] = msg->sg.data[i];
2783         } while (i != msg->sg.end);
2784
2785         sk_msg_iter_prev(msg, end);
2786 }
2787
2788 static void sk_msg_shift_right(struct sk_msg *msg, int i)
2789 {
2790         struct scatterlist tmp, sge;
2791
2792         sk_msg_iter_next(msg, end);
2793         sge = sk_msg_elem_cpy(msg, i);
2794         sk_msg_iter_var_next(i);
2795         tmp = sk_msg_elem_cpy(msg, i);
2796
2797         while (i != msg->sg.end) {
2798                 msg->sg.data[i] = sge;
2799                 sk_msg_iter_var_next(i);
2800                 sge = tmp;
2801                 tmp = sk_msg_elem_cpy(msg, i);
2802         }
2803 }
2804
2805 BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start,
2806            u32, len, u64, flags)
2807 {
2808         u32 i = 0, l = 0, space, offset = 0;
2809         u64 last = start + len;
2810         int pop;
2811
2812         if (unlikely(flags))
2813                 return -EINVAL;
2814
2815         /* First find the starting scatterlist element */
2816         i = msg->sg.start;
2817         do {
2818                 offset += l;
2819                 l = sk_msg_elem(msg, i)->length;
2820
2821                 if (start < offset + l)
2822                         break;
2823                 sk_msg_iter_var_next(i);
2824         } while (i != msg->sg.end);
2825
2826         /* Bounds checks: start and pop must be inside message */
2827         if (start >= offset + l || last >= msg->sg.size)
2828                 return -EINVAL;
2829
2830         space = MAX_MSG_FRAGS - sk_msg_elem_used(msg);
2831
2832         pop = len;
2833         /* --------------| offset
2834          * -| start      |-------- len -------|
2835          *
2836          *  |----- a ----|-------- pop -------|----- b ----|
2837          *  |______________________________________________| length
2838          *
2839          *
2840          * a:   region at front of scatter element to save
2841          * b:   region at back of scatter element to save when length > A + pop
2842          * pop: region to pop from element, same as input 'pop' here will be
2843          *      decremented below per iteration.
2844          *
2845          * Two top-level cases to handle when start != offset, first B is non
2846          * zero and second B is zero corresponding to when a pop includes more
2847          * than one element.
2848          *
2849          * Then if B is non-zero AND there is no space allocate space and
2850          * compact A, B regions into page. If there is space shift ring to
2851          * the rigth free'ing the next element in ring to place B, leaving
2852          * A untouched except to reduce length.
2853          */
2854         if (start != offset) {
2855                 struct scatterlist *nsge, *sge = sk_msg_elem(msg, i);
2856                 int a = start;
2857                 int b = sge->length - pop - a;
2858
2859                 sk_msg_iter_var_next(i);
2860
2861                 if (pop < sge->length - a) {
2862                         if (space) {
2863                                 sge->length = a;
2864                                 sk_msg_shift_right(msg, i);
2865                                 nsge = sk_msg_elem(msg, i);
2866                                 get_page(sg_page(sge));
2867                                 sg_set_page(nsge,
2868                                             sg_page(sge),
2869                                             b, sge->offset + pop + a);
2870                         } else {
2871                                 struct page *page, *orig;
2872                                 u8 *to, *from;
2873
2874                                 page = alloc_pages(__GFP_NOWARN |
2875                                                    __GFP_COMP   | GFP_ATOMIC,
2876                                                    get_order(a + b));
2877                                 if (unlikely(!page))
2878                                         return -ENOMEM;
2879
2880                                 sge->length = a;
2881                                 orig = sg_page(sge);
2882                                 from = sg_virt(sge);
2883                                 to = page_address(page);
2884                                 memcpy(to, from, a);
2885                                 memcpy(to + a, from + a + pop, b);
2886                                 sg_set_page(sge, page, a + b, 0);
2887                                 put_page(orig);
2888                         }
2889                         pop = 0;
2890                 } else if (pop >= sge->length - a) {
2891                         pop -= (sge->length - a);
2892                         sge->length = a;
2893                 }
2894         }
2895
2896         /* From above the current layout _must_ be as follows,
2897          *
2898          * -| offset
2899          * -| start
2900          *
2901          *  |---- pop ---|---------------- b ------------|
2902          *  |____________________________________________| length
2903          *
2904          * Offset and start of the current msg elem are equal because in the
2905          * previous case we handled offset != start and either consumed the
2906          * entire element and advanced to the next element OR pop == 0.
2907          *
2908          * Two cases to handle here are first pop is less than the length
2909          * leaving some remainder b above. Simply adjust the element's layout
2910          * in this case. Or pop >= length of the element so that b = 0. In this
2911          * case advance to next element decrementing pop.
2912          */
2913         while (pop) {
2914                 struct scatterlist *sge = sk_msg_elem(msg, i);
2915
2916                 if (pop < sge->length) {
2917                         sge->length -= pop;
2918                         sge->offset += pop;
2919                         pop = 0;
2920                 } else {
2921                         pop -= sge->length;
2922                         sk_msg_shift_left(msg, i);
2923                 }
2924                 sk_msg_iter_var_next(i);
2925         }
2926
2927         sk_mem_uncharge(msg->sk, len - pop);
2928         msg->sg.size -= (len - pop);
2929         sk_msg_compute_data_pointers(msg);
2930         return 0;
2931 }
2932
2933 static const struct bpf_func_proto bpf_msg_pop_data_proto = {
2934         .func           = bpf_msg_pop_data,
2935         .gpl_only       = false,
2936         .ret_type       = RET_INTEGER,
2937         .arg1_type      = ARG_PTR_TO_CTX,
2938         .arg2_type      = ARG_ANYTHING,
2939         .arg3_type      = ARG_ANYTHING,
2940         .arg4_type      = ARG_ANYTHING,
2941 };
2942
2943 #ifdef CONFIG_CGROUP_NET_CLASSID
2944 BPF_CALL_0(bpf_get_cgroup_classid_curr)
2945 {
2946         return __task_get_classid(current);
2947 }
2948
2949 static const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto = {
2950         .func           = bpf_get_cgroup_classid_curr,
2951         .gpl_only       = false,
2952         .ret_type       = RET_INTEGER,
2953 };
2954
2955 BPF_CALL_1(bpf_skb_cgroup_classid, const struct sk_buff *, skb)
2956 {
2957         struct sock *sk = skb_to_full_sk(skb);
2958
2959         if (!sk || !sk_fullsock(sk))
2960                 return 0;
2961
2962         return sock_cgroup_classid(&sk->sk_cgrp_data);
2963 }
2964
2965 static const struct bpf_func_proto bpf_skb_cgroup_classid_proto = {
2966         .func           = bpf_skb_cgroup_classid,
2967         .gpl_only       = false,
2968         .ret_type       = RET_INTEGER,
2969         .arg1_type      = ARG_PTR_TO_CTX,
2970 };
2971 #endif
2972
2973 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb)
2974 {
2975         return task_get_classid(skb);
2976 }
2977
2978 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = {
2979         .func           = bpf_get_cgroup_classid,
2980         .gpl_only       = false,
2981         .ret_type       = RET_INTEGER,
2982         .arg1_type      = ARG_PTR_TO_CTX,
2983 };
2984
2985 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb)
2986 {
2987         return dst_tclassid(skb);
2988 }
2989
2990 static const struct bpf_func_proto bpf_get_route_realm_proto = {
2991         .func           = bpf_get_route_realm,
2992         .gpl_only       = false,
2993         .ret_type       = RET_INTEGER,
2994         .arg1_type      = ARG_PTR_TO_CTX,
2995 };
2996
2997 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb)
2998 {
2999         /* If skb_clear_hash() was called due to mangling, we can
3000          * trigger SW recalculation here. Later access to hash
3001          * can then use the inline skb->hash via context directly
3002          * instead of calling this helper again.
3003          */
3004         return skb_get_hash(skb);
3005 }
3006
3007 static const struct bpf_func_proto bpf_get_hash_recalc_proto = {
3008         .func           = bpf_get_hash_recalc,
3009         .gpl_only       = false,
3010         .ret_type       = RET_INTEGER,
3011         .arg1_type      = ARG_PTR_TO_CTX,
3012 };
3013
3014 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb)
3015 {
3016         /* After all direct packet write, this can be used once for
3017          * triggering a lazy recalc on next skb_get_hash() invocation.
3018          */
3019         skb_clear_hash(skb);
3020         return 0;
3021 }
3022
3023 static const struct bpf_func_proto bpf_set_hash_invalid_proto = {
3024         .func           = bpf_set_hash_invalid,
3025         .gpl_only       = false,
3026         .ret_type       = RET_INTEGER,
3027         .arg1_type      = ARG_PTR_TO_CTX,
3028 };
3029
3030 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash)
3031 {
3032         /* Set user specified hash as L4(+), so that it gets returned
3033          * on skb_get_hash() call unless BPF prog later on triggers a
3034          * skb_clear_hash().
3035          */
3036         __skb_set_sw_hash(skb, hash, true);
3037         return 0;
3038 }
3039
3040 static const struct bpf_func_proto bpf_set_hash_proto = {
3041         .func           = bpf_set_hash,
3042         .gpl_only       = false,
3043         .ret_type       = RET_INTEGER,
3044         .arg1_type      = ARG_PTR_TO_CTX,
3045         .arg2_type      = ARG_ANYTHING,
3046 };
3047
3048 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto,
3049            u16, vlan_tci)
3050 {
3051         int ret;
3052
3053         if (unlikely(vlan_proto != htons(ETH_P_8021Q) &&
3054                      vlan_proto != htons(ETH_P_8021AD)))
3055                 vlan_proto = htons(ETH_P_8021Q);
3056
3057         bpf_push_mac_rcsum(skb);
3058         ret = skb_vlan_push(skb, vlan_proto, vlan_tci);
3059         bpf_pull_mac_rcsum(skb);
3060
3061         bpf_compute_data_pointers(skb);
3062         return ret;
3063 }
3064
3065 static const struct bpf_func_proto bpf_skb_vlan_push_proto = {
3066         .func           = bpf_skb_vlan_push,
3067         .gpl_only       = false,
3068         .ret_type       = RET_INTEGER,
3069         .arg1_type      = ARG_PTR_TO_CTX,
3070         .arg2_type      = ARG_ANYTHING,
3071         .arg3_type      = ARG_ANYTHING,
3072 };
3073
3074 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb)
3075 {
3076         int ret;
3077
3078         bpf_push_mac_rcsum(skb);
3079         ret = skb_vlan_pop(skb);
3080         bpf_pull_mac_rcsum(skb);
3081
3082         bpf_compute_data_pointers(skb);
3083         return ret;
3084 }
3085
3086 static const struct bpf_func_proto bpf_skb_vlan_pop_proto = {
3087         .func           = bpf_skb_vlan_pop,
3088         .gpl_only       = false,
3089         .ret_type       = RET_INTEGER,
3090         .arg1_type      = ARG_PTR_TO_CTX,
3091 };
3092
3093 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len)
3094 {
3095         /* Caller already did skb_cow() with len as headroom,
3096          * so no need to do it here.
3097          */
3098         skb_push(skb, len);
3099         memmove(skb->data, skb->data + len, off);
3100         memset(skb->data + off, 0, len);
3101
3102         /* No skb_postpush_rcsum(skb, skb->data + off, len)
3103          * needed here as it does not change the skb->csum
3104          * result for checksum complete when summing over
3105          * zeroed blocks.
3106          */
3107         return 0;
3108 }
3109
3110 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len)
3111 {
3112         /* skb_ensure_writable() is not needed here, as we're
3113          * already working on an uncloned skb.
3114          */
3115         if (unlikely(!pskb_may_pull(skb, off + len)))
3116                 return -ENOMEM;
3117
3118         skb_postpull_rcsum(skb, skb->data + off, len);
3119         memmove(skb->data + len, skb->data, off);
3120         __skb_pull(skb, len);
3121
3122         return 0;
3123 }
3124
3125 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len)
3126 {
3127         bool trans_same = skb->transport_header == skb->network_header;
3128         int ret;
3129
3130         /* There's no need for __skb_push()/__skb_pull() pair to
3131          * get to the start of the mac header as we're guaranteed
3132          * to always start from here under eBPF.
3133          */
3134         ret = bpf_skb_generic_push(skb, off, len);
3135         if (likely(!ret)) {
3136                 skb->mac_header -= len;
3137                 skb->network_header -= len;
3138                 if (trans_same)
3139                         skb->transport_header = skb->network_header;
3140         }
3141
3142         return ret;
3143 }
3144
3145 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len)
3146 {
3147         bool trans_same = skb->transport_header == skb->network_header;
3148         int ret;
3149
3150         /* Same here, __skb_push()/__skb_pull() pair not needed. */
3151         ret = bpf_skb_generic_pop(skb, off, len);
3152         if (likely(!ret)) {
3153                 skb->mac_header += len;
3154                 skb->network_header += len;
3155                 if (trans_same)
3156                         skb->transport_header = skb->network_header;
3157         }
3158
3159         return ret;
3160 }
3161
3162 static int bpf_skb_proto_4_to_6(struct sk_buff *skb)
3163 {
3164         const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
3165         u32 off = skb_mac_header_len(skb);
3166         int ret;
3167
3168         if (skb_is_gso(skb) && !skb_is_gso_tcp(skb))
3169                 return -ENOTSUPP;
3170
3171         ret = skb_cow(skb, len_diff);
3172         if (unlikely(ret < 0))
3173                 return ret;
3174
3175         ret = bpf_skb_net_hdr_push(skb, off, len_diff);
3176         if (unlikely(ret < 0))
3177                 return ret;
3178
3179         if (skb_is_gso(skb)) {
3180                 struct skb_shared_info *shinfo = skb_shinfo(skb);
3181
3182                 /* SKB_GSO_TCPV4 needs to be changed into
3183                  * SKB_GSO_TCPV6.
3184                  */
3185                 if (shinfo->gso_type & SKB_GSO_TCPV4) {
3186                         shinfo->gso_type &= ~SKB_GSO_TCPV4;
3187                         shinfo->gso_type |=  SKB_GSO_TCPV6;
3188                 }
3189
3190                 /* Due to IPv6 header, MSS needs to be downgraded. */
3191                 skb_decrease_gso_size(shinfo, len_diff);
3192                 /* Header must be checked, and gso_segs recomputed. */
3193                 shinfo->gso_type |= SKB_GSO_DODGY;
3194                 shinfo->gso_segs = 0;
3195         }
3196
3197         skb->protocol = htons(ETH_P_IPV6);
3198         skb_clear_hash(skb);
3199
3200         return 0;
3201 }
3202
3203 static int bpf_skb_proto_6_to_4(struct sk_buff *skb)
3204 {
3205         const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
3206         u32 off = skb_mac_header_len(skb);
3207         int ret;
3208
3209         if (skb_is_gso(skb) && !skb_is_gso_tcp(skb))
3210                 return -ENOTSUPP;
3211
3212         ret = skb_unclone(skb, GFP_ATOMIC);
3213         if (unlikely(ret < 0))
3214                 return ret;
3215
3216         ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
3217         if (unlikely(ret < 0))
3218                 return ret;
3219
3220         if (skb_is_gso(skb)) {
3221                 struct skb_shared_info *shinfo = skb_shinfo(skb);
3222
3223                 /* SKB_GSO_TCPV6 needs to be changed into
3224                  * SKB_GSO_TCPV4.
3225                  */
3226                 if (shinfo->gso_type & SKB_GSO_TCPV6) {
3227                         shinfo->gso_type &= ~SKB_GSO_TCPV6;
3228                         shinfo->gso_type |=  SKB_GSO_TCPV4;
3229                 }
3230
3231                 /* Due to IPv4 header, MSS can be upgraded. */
3232                 skb_increase_gso_size(shinfo, len_diff);
3233                 /* Header must be checked, and gso_segs recomputed. */
3234                 shinfo->gso_type |= SKB_GSO_DODGY;
3235                 shinfo->gso_segs = 0;
3236         }
3237
3238         skb->protocol = htons(ETH_P_IP);
3239         skb_clear_hash(skb);
3240
3241         return 0;
3242 }
3243
3244 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto)
3245 {
3246         __be16 from_proto = skb->protocol;
3247
3248         if (from_proto == htons(ETH_P_IP) &&
3249               to_proto == htons(ETH_P_IPV6))
3250                 return bpf_skb_proto_4_to_6(skb);
3251
3252         if (from_proto == htons(ETH_P_IPV6) &&
3253               to_proto == htons(ETH_P_IP))
3254                 return bpf_skb_proto_6_to_4(skb);
3255
3256         return -ENOTSUPP;
3257 }
3258
3259 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto,
3260            u64, flags)
3261 {
3262         int ret;
3263
3264         if (unlikely(flags))
3265                 return -EINVAL;
3266
3267         /* General idea is that this helper does the basic groundwork
3268          * needed for changing the protocol, and eBPF program fills the
3269          * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace()
3270          * and other helpers, rather than passing a raw buffer here.
3271          *
3272          * The rationale is to keep this minimal and without a need to
3273          * deal with raw packet data. F.e. even if we would pass buffers
3274          * here, the program still needs to call the bpf_lX_csum_replace()
3275          * helpers anyway. Plus, this way we keep also separation of
3276          * concerns, since f.e. bpf_skb_store_bytes() should only take
3277          * care of stores.
3278          *
3279          * Currently, additional options and extension header space are
3280          * not supported, but flags register is reserved so we can adapt
3281          * that. For offloads, we mark packet as dodgy, so that headers
3282          * need to be verified first.
3283          */
3284         ret = bpf_skb_proto_xlat(skb, proto);
3285         bpf_compute_data_pointers(skb);
3286         return ret;
3287 }
3288
3289 static const struct bpf_func_proto bpf_skb_change_proto_proto = {
3290         .func           = bpf_skb_change_proto,
3291         .gpl_only       = false,
3292         .ret_type       = RET_INTEGER,
3293         .arg1_type      = ARG_PTR_TO_CTX,
3294         .arg2_type      = ARG_ANYTHING,
3295         .arg3_type      = ARG_ANYTHING,
3296 };
3297
3298 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type)
3299 {
3300         /* We only allow a restricted subset to be changed for now. */
3301         if (unlikely(!skb_pkt_type_ok(skb->pkt_type) ||
3302                      !skb_pkt_type_ok(pkt_type)))
3303                 return -EINVAL;
3304
3305         skb->pkt_type = pkt_type;
3306         return 0;
3307 }
3308
3309 static const struct bpf_func_proto bpf_skb_change_type_proto = {
3310         .func           = bpf_skb_change_type,
3311         .gpl_only       = false,
3312         .ret_type       = RET_INTEGER,
3313         .arg1_type      = ARG_PTR_TO_CTX,
3314         .arg2_type      = ARG_ANYTHING,
3315 };
3316
3317 static u32 bpf_skb_net_base_len(const struct sk_buff *skb)
3318 {
3319         switch (skb->protocol) {
3320         case htons(ETH_P_IP):
3321                 return sizeof(struct iphdr);
3322         case htons(ETH_P_IPV6):
3323                 return sizeof(struct ipv6hdr);
3324         default:
3325                 return ~0U;
3326         }
3327 }
3328
3329 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK    (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \
3330                                          BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3331
3332 #define BPF_F_ADJ_ROOM_MASK             (BPF_F_ADJ_ROOM_FIXED_GSO | \
3333                                          BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \
3334                                          BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \
3335                                          BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \
3336                                          BPF_F_ADJ_ROOM_ENCAP_L2( \
3337                                           BPF_ADJ_ROOM_ENCAP_L2_MASK))
3338
3339 static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff,
3340                             u64 flags)
3341 {
3342         u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT;
3343         bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK;
3344         u16 mac_len = 0, inner_net = 0, inner_trans = 0;
3345         unsigned int gso_type = SKB_GSO_DODGY;
3346         int ret;
3347
3348         if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) {
3349                 /* udp gso_size delineates datagrams, only allow if fixed */
3350                 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) ||
3351                     !(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3352                         return -ENOTSUPP;
3353         }
3354
3355         ret = skb_cow_head(skb, len_diff);
3356         if (unlikely(ret < 0))
3357                 return ret;
3358
3359         if (encap) {
3360                 if (skb->protocol != htons(ETH_P_IP) &&
3361                     skb->protocol != htons(ETH_P_IPV6))
3362                         return -ENOTSUPP;
3363
3364                 if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 &&
3365                     flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3366                         return -EINVAL;
3367
3368                 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE &&
3369                     flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP)
3370                         return -EINVAL;
3371
3372                 if (skb->encapsulation)
3373                         return -EALREADY;
3374
3375                 mac_len = skb->network_header - skb->mac_header;
3376                 inner_net = skb->network_header;
3377                 if (inner_mac_len > len_diff)
3378                         return -EINVAL;
3379                 inner_trans = skb->transport_header;
3380         }
3381
3382         ret = bpf_skb_net_hdr_push(skb, off, len_diff);
3383         if (unlikely(ret < 0))
3384                 return ret;
3385
3386         if (encap) {
3387                 skb->inner_mac_header = inner_net - inner_mac_len;
3388                 skb->inner_network_header = inner_net;
3389                 skb->inner_transport_header = inner_trans;
3390                 skb_set_inner_protocol(skb, skb->protocol);
3391
3392                 skb->encapsulation = 1;
3393                 skb_set_network_header(skb, mac_len);
3394
3395                 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP)
3396                         gso_type |= SKB_GSO_UDP_TUNNEL;
3397                 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE)
3398                         gso_type |= SKB_GSO_GRE;
3399                 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3400                         gso_type |= SKB_GSO_IPXIP6;
3401                 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4)
3402                         gso_type |= SKB_GSO_IPXIP4;
3403
3404                 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE ||
3405                     flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) {
3406                         int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ?
3407                                         sizeof(struct ipv6hdr) :
3408                                         sizeof(struct iphdr);
3409
3410                         skb_set_transport_header(skb, mac_len + nh_len);
3411                 }
3412
3413                 /* Match skb->protocol to new outer l3 protocol */
3414                 if (skb->protocol == htons(ETH_P_IP) &&
3415                     flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3416                         skb->protocol = htons(ETH_P_IPV6);
3417                 else if (skb->protocol == htons(ETH_P_IPV6) &&
3418                          flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4)
3419                         skb->protocol = htons(ETH_P_IP);
3420         }
3421
3422         if (skb_is_gso(skb)) {
3423                 struct skb_shared_info *shinfo = skb_shinfo(skb);
3424
3425                 /* Due to header grow, MSS needs to be downgraded. */
3426                 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3427                         skb_decrease_gso_size(shinfo, len_diff);
3428
3429                 /* Header must be checked, and gso_segs recomputed. */
3430                 shinfo->gso_type |= gso_type;
3431                 shinfo->gso_segs = 0;
3432         }
3433
3434         return 0;
3435 }
3436
3437 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff,
3438                               u64 flags)
3439 {
3440         int ret;
3441
3442         if (unlikely(flags & ~(BPF_F_ADJ_ROOM_FIXED_GSO |
3443                                BPF_F_ADJ_ROOM_NO_CSUM_RESET)))
3444                 return -EINVAL;
3445
3446         if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) {
3447                 /* udp gso_size delineates datagrams, only allow if fixed */
3448                 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) ||
3449                     !(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3450                         return -ENOTSUPP;
3451         }
3452
3453         ret = skb_unclone(skb, GFP_ATOMIC);
3454         if (unlikely(ret < 0))
3455                 return ret;
3456
3457         ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
3458         if (unlikely(ret < 0))
3459                 return ret;
3460
3461         if (skb_is_gso(skb)) {
3462                 struct skb_shared_info *shinfo = skb_shinfo(skb);
3463
3464                 /* Due to header shrink, MSS can be upgraded. */
3465                 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3466                         skb_increase_gso_size(shinfo, len_diff);
3467
3468                 /* Header must be checked, and gso_segs recomputed. */
3469                 shinfo->gso_type |= SKB_GSO_DODGY;
3470                 shinfo->gso_segs = 0;
3471         }
3472
3473         return 0;
3474 }
3475
3476 static u32 __bpf_skb_max_len(const struct sk_buff *skb)
3477 {
3478         return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len :
3479                           SKB_MAX_ALLOC;
3480 }
3481
3482 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
3483            u32, mode, u64, flags)
3484 {
3485         u32 len_cur, len_diff_abs = abs(len_diff);
3486         u32 len_min = bpf_skb_net_base_len(skb);
3487         u32 len_max = __bpf_skb_max_len(skb);
3488         __be16 proto = skb->protocol;
3489         bool shrink = len_diff < 0;
3490         u32 off;
3491         int ret;
3492
3493         if (unlikely(flags & ~(BPF_F_ADJ_ROOM_MASK |
3494                                BPF_F_ADJ_ROOM_NO_CSUM_RESET)))
3495                 return -EINVAL;
3496         if (unlikely(len_diff_abs > 0xfffU))
3497                 return -EFAULT;
3498         if (unlikely(proto != htons(ETH_P_IP) &&
3499                      proto != htons(ETH_P_IPV6)))
3500                 return -ENOTSUPP;
3501
3502         off = skb_mac_header_len(skb);
3503         switch (mode) {
3504         case BPF_ADJ_ROOM_NET:
3505                 off += bpf_skb_net_base_len(skb);
3506                 break;
3507         case BPF_ADJ_ROOM_MAC:
3508                 break;
3509         default:
3510                 return -ENOTSUPP;
3511         }
3512
3513         len_cur = skb->len - skb_network_offset(skb);
3514         if ((shrink && (len_diff_abs >= len_cur ||
3515                         len_cur - len_diff_abs < len_min)) ||
3516             (!shrink && (skb->len + len_diff_abs > len_max &&
3517                          !skb_is_gso(skb))))
3518                 return -ENOTSUPP;
3519
3520         ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) :
3521                        bpf_skb_net_grow(skb, off, len_diff_abs, flags);
3522         if (!ret && !(flags & BPF_F_ADJ_ROOM_NO_CSUM_RESET))
3523                 __skb_reset_checksum_unnecessary(skb);
3524
3525         bpf_compute_data_pointers(skb);
3526         return ret;
3527 }
3528
3529 static const struct bpf_func_proto bpf_skb_adjust_room_proto = {
3530         .func           = bpf_skb_adjust_room,
3531         .gpl_only       = false,
3532         .ret_type       = RET_INTEGER,
3533         .arg1_type      = ARG_PTR_TO_CTX,
3534         .arg2_type      = ARG_ANYTHING,
3535         .arg3_type      = ARG_ANYTHING,
3536         .arg4_type      = ARG_ANYTHING,
3537 };
3538
3539 static u32 __bpf_skb_min_len(const struct sk_buff *skb)
3540 {
3541         u32 min_len = skb_network_offset(skb);
3542
3543         if (skb_transport_header_was_set(skb))
3544                 min_len = skb_transport_offset(skb);
3545         if (skb->ip_summed == CHECKSUM_PARTIAL)
3546                 min_len = skb_checksum_start_offset(skb) +
3547                           skb->csum_offset + sizeof(__sum16);
3548         return min_len;
3549 }
3550
3551 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len)
3552 {
3553         unsigned int old_len = skb->len;
3554         int ret;
3555
3556         ret = __skb_grow_rcsum(skb, new_len);
3557         if (!ret)
3558                 memset(skb->data + old_len, 0, new_len - old_len);
3559         return ret;
3560 }
3561
3562 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len)
3563 {
3564         return __skb_trim_rcsum(skb, new_len);
3565 }
3566
3567 static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len,
3568                                         u64 flags)
3569 {
3570         u32 max_len = __bpf_skb_max_len(skb);
3571         u32 min_len = __bpf_skb_min_len(skb);
3572         int ret;
3573
3574         if (unlikely(flags || new_len > max_len || new_len < min_len))
3575                 return -EINVAL;
3576         if (skb->encapsulation)
3577                 return -ENOTSUPP;
3578
3579         /* The basic idea of this helper is that it's performing the
3580          * needed work to either grow or trim an skb, and eBPF program
3581          * rewrites the rest via helpers like bpf_skb_store_bytes(),
3582          * bpf_lX_csum_replace() and others rather than passing a raw
3583          * buffer here. This one is a slow path helper and intended
3584          * for replies with control messages.
3585          *
3586          * Like in bpf_skb_change_proto(), we want to keep this rather
3587          * minimal and without protocol specifics so that we are able
3588          * to separate concerns as in bpf_skb_store_bytes() should only
3589          * be the one responsible for writing buffers.
3590          *
3591          * It's really expected to be a slow path operation here for
3592          * control message replies, so we're implicitly linearizing,
3593          * uncloning and drop offloads from the skb by this.
3594          */
3595         ret = __bpf_try_make_writable(skb, skb->len);
3596         if (!ret) {
3597                 if (new_len > skb->len)
3598                         ret = bpf_skb_grow_rcsum(skb, new_len);
3599                 else if (new_len < skb->len)
3600                         ret = bpf_skb_trim_rcsum(skb, new_len);
3601                 if (!ret && skb_is_gso(skb))
3602                         skb_gso_reset(skb);
3603         }
3604         return ret;
3605 }
3606
3607 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len,
3608            u64, flags)
3609 {
3610         int ret = __bpf_skb_change_tail(skb, new_len, flags);
3611
3612         bpf_compute_data_pointers(skb);
3613         return ret;
3614 }
3615
3616 static const struct bpf_func_proto bpf_skb_change_tail_proto = {
3617         .func           = bpf_skb_change_tail,
3618         .gpl_only       = false,
3619         .ret_type       = RET_INTEGER,
3620         .arg1_type      = ARG_PTR_TO_CTX,
3621         .arg2_type      = ARG_ANYTHING,
3622         .arg3_type      = ARG_ANYTHING,
3623 };
3624
3625 BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len,
3626            u64, flags)
3627 {
3628         int ret = __bpf_skb_change_tail(skb, new_len, flags);
3629
3630         bpf_compute_data_end_sk_skb(skb);
3631         return ret;
3632 }
3633
3634 static const struct bpf_func_proto sk_skb_change_tail_proto = {
3635         .func           = sk_skb_change_tail,
3636         .gpl_only       = false,
3637         .ret_type       = RET_INTEGER,
3638         .arg1_type      = ARG_PTR_TO_CTX,
3639         .arg2_type      = ARG_ANYTHING,
3640         .arg3_type      = ARG_ANYTHING,
3641 };
3642
3643 static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room,
3644                                         u64 flags)
3645 {
3646         u32 max_len = __bpf_skb_max_len(skb);
3647         u32 new_len = skb->len + head_room;
3648         int ret;
3649
3650         if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) ||
3651                      new_len < skb->len))
3652                 return -EINVAL;
3653
3654         ret = skb_cow(skb, head_room);
3655         if (likely(!ret)) {
3656                 /* Idea for this helper is that we currently only
3657                  * allow to expand on mac header. This means that
3658                  * skb->protocol network header, etc, stay as is.
3659                  * Compared to bpf_skb_change_tail(), we're more
3660                  * flexible due to not needing to linearize or
3661                  * reset GSO. Intention for this helper is to be
3662                  * used by an L3 skb that needs to push mac header
3663                  * for redirection into L2 device.
3664                  */
3665                 __skb_push(skb, head_room);
3666                 memset(skb->data, 0, head_room);
3667                 skb_reset_mac_header(skb);
3668         }
3669
3670         return ret;
3671 }
3672
3673 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room,
3674            u64, flags)
3675 {
3676         int ret = __bpf_skb_change_head(skb, head_room, flags);
3677
3678         bpf_compute_data_pointers(skb);
3679         return ret;
3680 }
3681
3682 static const struct bpf_func_proto bpf_skb_change_head_proto = {
3683         .func           = bpf_skb_change_head,
3684         .gpl_only       = false,
3685         .ret_type       = RET_INTEGER,
3686         .arg1_type      = ARG_PTR_TO_CTX,
3687         .arg2_type      = ARG_ANYTHING,
3688         .arg3_type      = ARG_ANYTHING,
3689 };
3690
3691 BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room,
3692            u64, flags)
3693 {
3694         int ret = __bpf_skb_change_head(skb, head_room, flags);
3695
3696         bpf_compute_data_end_sk_skb(skb);
3697         return ret;
3698 }
3699
3700 static const struct bpf_func_proto sk_skb_change_head_proto = {
3701         .func           = sk_skb_change_head,
3702         .gpl_only       = false,
3703         .ret_type       = RET_INTEGER,
3704         .arg1_type      = ARG_PTR_TO_CTX,
3705         .arg2_type      = ARG_ANYTHING,
3706         .arg3_type      = ARG_ANYTHING,
3707 };
3708 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp)
3709 {
3710         return xdp_data_meta_unsupported(xdp) ? 0 :
3711                xdp->data - xdp->data_meta;
3712 }
3713
3714 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset)
3715 {
3716         void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame);
3717         unsigned long metalen = xdp_get_metalen(xdp);
3718         void *data_start = xdp_frame_end + metalen;
3719         void *data = xdp->data + offset;
3720
3721         if (unlikely(data < data_start ||
3722                      data > xdp->data_end - ETH_HLEN))
3723                 return -EINVAL;
3724
3725         if (metalen)
3726                 memmove(xdp->data_meta + offset,
3727                         xdp->data_meta, metalen);
3728         xdp->data_meta += offset;
3729         xdp->data = data;
3730
3731         return 0;
3732 }
3733
3734 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = {
3735         .func           = bpf_xdp_adjust_head,
3736         .gpl_only       = false,
3737         .ret_type       = RET_INTEGER,
3738         .arg1_type      = ARG_PTR_TO_CTX,
3739         .arg2_type      = ARG_ANYTHING,
3740 };
3741
3742 BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset)
3743 {
3744         void *data_hard_end = xdp_data_hard_end(xdp); /* use xdp->frame_sz */
3745         void *data_end = xdp->data_end + offset;
3746
3747         /* Notice that xdp_data_hard_end have reserved some tailroom */
3748         if (unlikely(data_end > data_hard_end))
3749                 return -EINVAL;
3750
3751         /* ALL drivers MUST init xdp->frame_sz, chicken check below */
3752         if (unlikely(xdp->frame_sz > PAGE_SIZE)) {
3753                 WARN_ONCE(1, "Too BIG xdp->frame_sz = %d\n", xdp->frame_sz);
3754                 return -EINVAL;
3755         }
3756
3757         if (unlikely(data_end < xdp->data + ETH_HLEN))
3758                 return -EINVAL;
3759
3760         /* Clear memory area on grow, can contain uninit kernel memory */
3761         if (offset > 0)
3762                 memset(xdp->data_end, 0, offset);
3763
3764         xdp->data_end = data_end;
3765
3766         return 0;
3767 }
3768
3769 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = {
3770         .func           = bpf_xdp_adjust_tail,
3771         .gpl_only       = false,
3772         .ret_type       = RET_INTEGER,
3773         .arg1_type      = ARG_PTR_TO_CTX,
3774         .arg2_type      = ARG_ANYTHING,
3775 };
3776
3777 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset)
3778 {
3779         void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame);
3780         void *meta = xdp->data_meta + offset;
3781         unsigned long metalen = xdp->data - meta;
3782
3783         if (xdp_data_meta_unsupported(xdp))
3784                 return -ENOTSUPP;
3785         if (unlikely(meta < xdp_frame_end ||
3786                      meta > xdp->data))
3787                 return -EINVAL;
3788         if (unlikely((metalen & (sizeof(__u32) - 1)) ||
3789                      (metalen > 32)))
3790                 return -EACCES;
3791
3792         xdp->data_meta = meta;
3793
3794         return 0;
3795 }
3796
3797 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = {
3798         .func           = bpf_xdp_adjust_meta,
3799         .gpl_only       = false,
3800         .ret_type       = RET_INTEGER,
3801         .arg1_type      = ARG_PTR_TO_CTX,
3802         .arg2_type      = ARG_ANYTHING,
3803 };
3804
3805 static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
3806                             struct bpf_map *map, struct xdp_buff *xdp)
3807 {
3808         switch (map->map_type) {
3809         case BPF_MAP_TYPE_DEVMAP:
3810         case BPF_MAP_TYPE_DEVMAP_HASH:
3811                 return dev_map_enqueue(fwd, xdp, dev_rx);
3812         case BPF_MAP_TYPE_CPUMAP:
3813                 return cpu_map_enqueue(fwd, xdp, dev_rx);
3814         case BPF_MAP_TYPE_XSKMAP:
3815                 return __xsk_map_redirect(fwd, xdp);
3816         default:
3817                 return -EBADRQC;
3818         }
3819         return 0;
3820 }
3821
3822 void xdp_do_flush(void)
3823 {
3824         __dev_flush();
3825         __cpu_map_flush();
3826         __xsk_map_flush();
3827 }
3828 EXPORT_SYMBOL_GPL(xdp_do_flush);
3829
3830 static inline void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index)
3831 {
3832         switch (map->map_type) {
3833         case BPF_MAP_TYPE_DEVMAP:
3834                 return __dev_map_lookup_elem(map, index);
3835         case BPF_MAP_TYPE_DEVMAP_HASH:
3836                 return __dev_map_hash_lookup_elem(map, index);
3837         case BPF_MAP_TYPE_CPUMAP:
3838                 return __cpu_map_lookup_elem(map, index);
3839         case BPF_MAP_TYPE_XSKMAP:
3840                 return __xsk_map_lookup_elem(map, index);
3841         default:
3842                 return NULL;
3843         }
3844 }
3845
3846 void bpf_clear_redirect_map(struct bpf_map *map)
3847 {
3848         struct bpf_redirect_info *ri;
3849         int cpu;
3850
3851         for_each_possible_cpu(cpu) {
3852                 ri = per_cpu_ptr(&bpf_redirect_info, cpu);
3853                 /* Avoid polluting remote cacheline due to writes if
3854                  * not needed. Once we pass this test, we need the
3855                  * cmpxchg() to make sure it hasn't been changed in
3856                  * the meantime by remote CPU.
3857                  */
3858                 if (unlikely(READ_ONCE(ri->map) == map))
3859                         cmpxchg(&ri->map, map, NULL);
3860         }
3861 }
3862
3863 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
3864                     struct bpf_prog *xdp_prog)
3865 {
3866         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
3867         struct bpf_map *map = READ_ONCE(ri->map);
3868         u32 index = ri->tgt_index;
3869         void *fwd = ri->tgt_value;
3870         int err;
3871
3872         ri->tgt_index = 0;
3873         ri->tgt_value = NULL;
3874         WRITE_ONCE(ri->map, NULL);
3875
3876         if (unlikely(!map)) {
3877                 fwd = dev_get_by_index_rcu(dev_net(dev), index);
3878                 if (unlikely(!fwd)) {
3879                         err = -EINVAL;
3880                         goto err;
3881                 }
3882
3883                 err = dev_xdp_enqueue(fwd, xdp, dev);
3884         } else {
3885                 err = __bpf_tx_xdp_map(dev, fwd, map, xdp);
3886         }
3887
3888         if (unlikely(err))
3889                 goto err;
3890
3891         _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
3892         return 0;
3893 err:
3894         _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
3895         return err;
3896 }
3897 EXPORT_SYMBOL_GPL(xdp_do_redirect);
3898
3899 static int xdp_do_generic_redirect_map(struct net_device *dev,
3900                                        struct sk_buff *skb,
3901                                        struct xdp_buff *xdp,
3902                                        struct bpf_prog *xdp_prog,
3903                                        struct bpf_map *map)
3904 {
3905         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
3906         u32 index = ri->tgt_index;
3907         void *fwd = ri->tgt_value;
3908         int err = 0;
3909
3910         ri->tgt_index = 0;
3911         ri->tgt_value = NULL;
3912         WRITE_ONCE(ri->map, NULL);
3913
3914         if (map->map_type == BPF_MAP_TYPE_DEVMAP ||
3915             map->map_type == BPF_MAP_TYPE_DEVMAP_HASH) {
3916                 struct bpf_dtab_netdev *dst = fwd;
3917
3918                 err = dev_map_generic_redirect(dst, skb, xdp_prog);
3919                 if (unlikely(err))
3920                         goto err;
3921         } else if (map->map_type == BPF_MAP_TYPE_XSKMAP) {
3922                 struct xdp_sock *xs = fwd;
3923
3924                 err = xsk_generic_rcv(xs, xdp);
3925                 if (err)
3926                         goto err;
3927                 consume_skb(skb);
3928         } else {
3929                 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */
3930                 err = -EBADRQC;
3931                 goto err;
3932         }
3933
3934         _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
3935         return 0;
3936 err:
3937         _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
3938         return err;
3939 }
3940
3941 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
3942                             struct xdp_buff *xdp, struct bpf_prog *xdp_prog)
3943 {
3944         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
3945         struct bpf_map *map = READ_ONCE(ri->map);
3946         u32 index = ri->tgt_index;
3947         struct net_device *fwd;
3948         int err = 0;
3949
3950         if (map)
3951                 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog,
3952                                                    map);
3953         ri->tgt_index = 0;
3954         fwd = dev_get_by_index_rcu(dev_net(dev), index);
3955         if (unlikely(!fwd)) {
3956                 err = -EINVAL;
3957                 goto err;
3958         }
3959
3960         err = xdp_ok_fwd_dev(fwd, skb->len);
3961         if (unlikely(err))
3962                 goto err;
3963
3964         skb->dev = fwd;
3965         _trace_xdp_redirect(dev, xdp_prog, index);
3966         generic_xdp_tx(skb, xdp_prog);
3967         return 0;
3968 err:
3969         _trace_xdp_redirect_err(dev, xdp_prog, index, err);
3970         return err;
3971 }
3972
3973 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags)
3974 {
3975         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
3976
3977         if (unlikely(flags))
3978                 return XDP_ABORTED;
3979
3980         ri->flags = flags;
3981         ri->tgt_index = ifindex;
3982         ri->tgt_value = NULL;
3983         WRITE_ONCE(ri->map, NULL);
3984
3985         return XDP_REDIRECT;
3986 }
3987
3988 static const struct bpf_func_proto bpf_xdp_redirect_proto = {
3989         .func           = bpf_xdp_redirect,
3990         .gpl_only       = false,
3991         .ret_type       = RET_INTEGER,
3992         .arg1_type      = ARG_ANYTHING,
3993         .arg2_type      = ARG_ANYTHING,
3994 };
3995
3996 BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex,
3997            u64, flags)
3998 {
3999         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
4000
4001         /* Lower bits of the flags are used as return code on lookup failure */
4002         if (unlikely(flags > XDP_TX))
4003                 return XDP_ABORTED;
4004
4005         ri->tgt_value = __xdp_map_lookup_elem(map, ifindex);
4006         if (unlikely(!ri->tgt_value)) {
4007                 /* If the lookup fails we want to clear out the state in the
4008                  * redirect_info struct completely, so that if an eBPF program
4009                  * performs multiple lookups, the last one always takes
4010                  * precedence.
4011                  */
4012                 WRITE_ONCE(ri->map, NULL);
4013                 return flags;
4014         }
4015
4016         ri->flags = flags;
4017         ri->tgt_index = ifindex;
4018         WRITE_ONCE(ri->map, map);
4019
4020         return XDP_REDIRECT;
4021 }
4022
4023 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = {
4024         .func           = bpf_xdp_redirect_map,
4025         .gpl_only       = false,
4026         .ret_type       = RET_INTEGER,
4027         .arg1_type      = ARG_CONST_MAP_PTR,
4028         .arg2_type      = ARG_ANYTHING,
4029         .arg3_type      = ARG_ANYTHING,
4030 };
4031
4032 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb,
4033                                   unsigned long off, unsigned long len)
4034 {
4035         void *ptr = skb_header_pointer(skb, off, len, dst_buff);
4036
4037         if (unlikely(!ptr))
4038                 return len;
4039         if (ptr != dst_buff)
4040                 memcpy(dst_buff, ptr, len);
4041
4042         return 0;
4043 }
4044
4045 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map,
4046            u64, flags, void *, meta, u64, meta_size)
4047 {
4048         u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
4049
4050         if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
4051                 return -EINVAL;
4052         if (unlikely(!skb || skb_size > skb->len))
4053                 return -EFAULT;
4054
4055         return bpf_event_output(map, flags, meta, meta_size, skb, skb_size,
4056                                 bpf_skb_copy);
4057 }
4058
4059 static const struct bpf_func_proto bpf_skb_event_output_proto = {
4060         .func           = bpf_skb_event_output,
4061         .gpl_only       = true,
4062         .ret_type       = RET_INTEGER,
4063         .arg1_type      = ARG_PTR_TO_CTX,
4064         .arg2_type      = ARG_CONST_MAP_PTR,
4065         .arg3_type      = ARG_ANYTHING,
4066         .arg4_type      = ARG_PTR_TO_MEM,
4067         .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
4068 };
4069
4070 BTF_ID_LIST_SINGLE(bpf_skb_output_btf_ids, struct, sk_buff)
4071
4072 const struct bpf_func_proto bpf_skb_output_proto = {
4073         .func           = bpf_skb_event_output,
4074         .gpl_only       = true,
4075         .ret_type       = RET_INTEGER,
4076         .arg1_type      = ARG_PTR_TO_BTF_ID,
4077         .arg1_btf_id    = &bpf_skb_output_btf_ids[0],
4078         .arg2_type      = ARG_CONST_MAP_PTR,
4079         .arg3_type      = ARG_ANYTHING,
4080         .arg4_type      = ARG_PTR_TO_MEM,
4081         .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
4082 };
4083
4084 static unsigned short bpf_tunnel_key_af(u64 flags)
4085 {
4086         return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET;
4087 }
4088
4089 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to,
4090            u32, size, u64, flags)
4091 {
4092         const struct ip_tunnel_info *info = skb_tunnel_info(skb);
4093         u8 compat[sizeof(struct bpf_tunnel_key)];
4094         void *to_orig = to;
4095         int err;
4096
4097         if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) {
4098                 err = -EINVAL;
4099                 goto err_clear;
4100         }
4101         if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) {
4102                 err = -EPROTO;
4103                 goto err_clear;
4104         }
4105         if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
4106                 err = -EINVAL;
4107                 switch (size) {
4108                 case offsetof(struct bpf_tunnel_key, tunnel_label):
4109                 case offsetof(struct bpf_tunnel_key, tunnel_ext):
4110                         goto set_compat;
4111                 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
4112                         /* Fixup deprecated structure layouts here, so we have
4113                          * a common path later on.
4114                          */
4115                         if (ip_tunnel_info_af(info) != AF_INET)
4116                                 goto err_clear;
4117 set_compat:
4118                         to = (struct bpf_tunnel_key *)compat;
4119                         break;
4120                 default:
4121                         goto err_clear;
4122                 }
4123         }
4124
4125         to->tunnel_id = be64_to_cpu(info->key.tun_id);
4126         to->tunnel_tos = info->key.tos;
4127         to->tunnel_ttl = info->key.ttl;
4128         to->tunnel_ext = 0;
4129
4130         if (flags & BPF_F_TUNINFO_IPV6) {
4131                 memcpy(to->remote_ipv6, &info->key.u.ipv6.src,
4132                        sizeof(to->remote_ipv6));
4133                 to->tunnel_label = be32_to_cpu(info->key.label);
4134         } else {
4135                 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src);
4136                 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3);
4137                 to->tunnel_label = 0;
4138         }
4139
4140         if (unlikely(size != sizeof(struct bpf_tunnel_key)))
4141                 memcpy(to_orig, to, size);
4142
4143         return 0;
4144 err_clear:
4145         memset(to_orig, 0, size);
4146         return err;
4147 }
4148
4149 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = {
4150         .func           = bpf_skb_get_tunnel_key,
4151         .gpl_only       = false,
4152         .ret_type       = RET_INTEGER,
4153         .arg1_type      = ARG_PTR_TO_CTX,
4154         .arg2_type      = ARG_PTR_TO_UNINIT_MEM,
4155         .arg3_type      = ARG_CONST_SIZE,
4156         .arg4_type      = ARG_ANYTHING,
4157 };
4158
4159 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size)
4160 {
4161         const struct ip_tunnel_info *info = skb_tunnel_info(skb);
4162         int err;
4163
4164         if (unlikely(!info ||
4165                      !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) {
4166                 err = -ENOENT;
4167                 goto err_clear;
4168         }
4169         if (unlikely(size < info->options_len)) {
4170                 err = -ENOMEM;
4171                 goto err_clear;
4172         }
4173
4174         ip_tunnel_info_opts_get(to, info);
4175         if (size > info->options_len)
4176                 memset(to + info->options_len, 0, size - info->options_len);
4177
4178         return info->options_len;
4179 err_clear:
4180         memset(to, 0, size);
4181         return err;
4182 }
4183
4184 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = {
4185         .func           = bpf_skb_get_tunnel_opt,
4186         .gpl_only       = false,
4187         .ret_type       = RET_INTEGER,
4188         .arg1_type      = ARG_PTR_TO_CTX,
4189         .arg2_type      = ARG_PTR_TO_UNINIT_MEM,
4190         .arg3_type      = ARG_CONST_SIZE,
4191 };
4192
4193 static struct metadata_dst __percpu *md_dst;
4194
4195 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
4196            const struct bpf_tunnel_key *, from, u32, size, u64, flags)
4197 {
4198         struct metadata_dst *md = this_cpu_ptr(md_dst);
4199         u8 compat[sizeof(struct bpf_tunnel_key)];
4200         struct ip_tunnel_info *info;
4201
4202         if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX |
4203                                BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER)))
4204                 return -EINVAL;
4205         if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
4206                 switch (size) {
4207                 case offsetof(struct bpf_tunnel_key, tunnel_label):
4208                 case offsetof(struct bpf_tunnel_key, tunnel_ext):
4209                 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
4210                         /* Fixup deprecated structure layouts here, so we have
4211                          * a common path later on.
4212                          */
4213                         memcpy(compat, from, size);
4214                         memset(compat + size, 0, sizeof(compat) - size);
4215                         from = (const struct bpf_tunnel_key *) compat;
4216                         break;
4217                 default:
4218                         return -EINVAL;
4219                 }
4220         }
4221         if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) ||
4222                      from->tunnel_ext))
4223                 return -EINVAL;
4224
4225         skb_dst_drop(skb);
4226         dst_hold((struct dst_entry *) md);
4227         skb_dst_set(skb, (struct dst_entry *) md);
4228
4229         info = &md->u.tun_info;
4230         memset(info, 0, sizeof(*info));
4231         info->mode = IP_TUNNEL_INFO_TX;
4232
4233         info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
4234         if (flags & BPF_F_DONT_FRAGMENT)
4235                 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT;
4236         if (flags & BPF_F_ZERO_CSUM_TX)
4237                 info->key.tun_flags &= ~TUNNEL_CSUM;
4238         if (flags & BPF_F_SEQ_NUMBER)
4239                 info->key.tun_flags |= TUNNEL_SEQ;
4240
4241         info->key.tun_id = cpu_to_be64(from->tunnel_id);
4242         info->key.tos = from->tunnel_tos;
4243         info->key.ttl = from->tunnel_ttl;
4244
4245         if (flags & BPF_F_TUNINFO_IPV6) {
4246                 info->mode |= IP_TUNNEL_INFO_IPV6;
4247                 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6,
4248                        sizeof(from->remote_ipv6));
4249                 info->key.label = cpu_to_be32(from->tunnel_label) &
4250                                   IPV6_FLOWLABEL_MASK;
4251         } else {
4252                 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4);
4253         }
4254
4255         return 0;
4256 }
4257
4258 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = {
4259         .func           = bpf_skb_set_tunnel_key,
4260         .gpl_only       = false,
4261         .ret_type       = RET_INTEGER,
4262         .arg1_type      = ARG_PTR_TO_CTX,
4263         .arg2_type      = ARG_PTR_TO_MEM,
4264         .arg3_type      = ARG_CONST_SIZE,
4265         .arg4_type      = ARG_ANYTHING,
4266 };
4267
4268 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb,
4269            const u8 *, from, u32, size)
4270 {
4271         struct ip_tunnel_info *info = skb_tunnel_info(skb);
4272         const struct metadata_dst *md = this_cpu_ptr(md_dst);
4273
4274         if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1))))
4275                 return -EINVAL;
4276         if (unlikely(size > IP_TUNNEL_OPTS_MAX))
4277                 return -ENOMEM;
4278
4279         ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT);
4280
4281         return 0;
4282 }
4283
4284 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = {
4285         .func           = bpf_skb_set_tunnel_opt,
4286         .gpl_only       = false,
4287         .ret_type       = RET_INTEGER,
4288         .arg1_type      = ARG_PTR_TO_CTX,
4289         .arg2_type      = ARG_PTR_TO_MEM,
4290         .arg3_type      = ARG_CONST_SIZE,
4291 };
4292
4293 static const struct bpf_func_proto *
4294 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which)
4295 {
4296         if (!md_dst) {
4297                 struct metadata_dst __percpu *tmp;
4298
4299                 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX,
4300                                                 METADATA_IP_TUNNEL,
4301                                                 GFP_KERNEL);
4302                 if (!tmp)
4303                         return NULL;
4304                 if (cmpxchg(&md_dst, NULL, tmp))
4305                         metadata_dst_free_percpu(tmp);
4306         }
4307
4308         switch (which) {
4309         case BPF_FUNC_skb_set_tunnel_key:
4310                 return &bpf_skb_set_tunnel_key_proto;
4311         case BPF_FUNC_skb_set_tunnel_opt:
4312                 return &bpf_skb_set_tunnel_opt_proto;
4313         default:
4314                 return NULL;
4315         }
4316 }
4317
4318 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map,
4319            u32, idx)
4320 {
4321         struct bpf_array *array = container_of(map, struct bpf_array, map);
4322         struct cgroup *cgrp;
4323         struct sock *sk;
4324
4325         sk = skb_to_full_sk(skb);
4326         if (!sk || !sk_fullsock(sk))
4327                 return -ENOENT;
4328         if (unlikely(idx >= array->map.max_entries))
4329                 return -E2BIG;
4330
4331         cgrp = READ_ONCE(array->ptrs[idx]);
4332         if (unlikely(!cgrp))
4333                 return -EAGAIN;
4334
4335         return sk_under_cgroup_hierarchy(sk, cgrp);
4336 }
4337
4338 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = {
4339         .func           = bpf_skb_under_cgroup,
4340         .gpl_only       = false,
4341         .ret_type       = RET_INTEGER,
4342         .arg1_type      = ARG_PTR_TO_CTX,
4343         .arg2_type      = ARG_CONST_MAP_PTR,
4344         .arg3_type      = ARG_ANYTHING,
4345 };
4346
4347 #ifdef CONFIG_SOCK_CGROUP_DATA
4348 static inline u64 __bpf_sk_cgroup_id(struct sock *sk)
4349 {
4350         struct cgroup *cgrp;
4351
4352         sk = sk_to_full_sk(sk);
4353         if (!sk || !sk_fullsock(sk))
4354                 return 0;
4355
4356         cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
4357         return cgroup_id(cgrp);
4358 }
4359
4360 BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb)
4361 {
4362         return __bpf_sk_cgroup_id(skb->sk);
4363 }
4364
4365 static const struct bpf_func_proto bpf_skb_cgroup_id_proto = {
4366         .func           = bpf_skb_cgroup_id,
4367         .gpl_only       = false,
4368         .ret_type       = RET_INTEGER,
4369         .arg1_type      = ARG_PTR_TO_CTX,
4370 };
4371
4372 static inline u64 __bpf_sk_ancestor_cgroup_id(struct sock *sk,
4373                                               int ancestor_level)
4374 {
4375         struct cgroup *ancestor;
4376         struct cgroup *cgrp;
4377
4378         sk = sk_to_full_sk(sk);
4379         if (!sk || !sk_fullsock(sk))
4380                 return 0;
4381
4382         cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
4383         ancestor = cgroup_ancestor(cgrp, ancestor_level);
4384         if (!ancestor)
4385                 return 0;
4386
4387         return cgroup_id(ancestor);
4388 }
4389
4390 BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int,
4391            ancestor_level)
4392 {
4393         return __bpf_sk_ancestor_cgroup_id(skb->sk, ancestor_level);
4394 }
4395
4396 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = {
4397         .func           = bpf_skb_ancestor_cgroup_id,
4398         .gpl_only       = false,
4399         .ret_type       = RET_INTEGER,
4400         .arg1_type      = ARG_PTR_TO_CTX,
4401         .arg2_type      = ARG_ANYTHING,
4402 };
4403
4404 BPF_CALL_1(bpf_sk_cgroup_id, struct sock *, sk)
4405 {
4406         return __bpf_sk_cgroup_id(sk);
4407 }
4408
4409 static const struct bpf_func_proto bpf_sk_cgroup_id_proto = {
4410         .func           = bpf_sk_cgroup_id,
4411         .gpl_only       = false,
4412         .ret_type       = RET_INTEGER,
4413         .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
4414 };
4415
4416 BPF_CALL_2(bpf_sk_ancestor_cgroup_id, struct sock *, sk, int, ancestor_level)
4417 {
4418         return __bpf_sk_ancestor_cgroup_id(sk, ancestor_level);
4419 }
4420
4421 static const struct bpf_func_proto bpf_sk_ancestor_cgroup_id_proto = {
4422         .func           = bpf_sk_ancestor_cgroup_id,
4423         .gpl_only       = false,
4424         .ret_type       = RET_INTEGER,
4425         .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
4426         .arg2_type      = ARG_ANYTHING,
4427 };
4428 #endif
4429
4430 static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff,
4431                                   unsigned long off, unsigned long len)
4432 {
4433         memcpy(dst_buff, src_buff + off, len);
4434         return 0;
4435 }
4436
4437 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map,
4438            u64, flags, void *, meta, u64, meta_size)
4439 {
4440         u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
4441
4442         if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
4443                 return -EINVAL;
4444         if (unlikely(!xdp ||
4445                      xdp_size > (unsigned long)(xdp->data_end - xdp->data)))
4446                 return -EFAULT;
4447
4448         return bpf_event_output(map, flags, meta, meta_size, xdp->data,
4449                                 xdp_size, bpf_xdp_copy);
4450 }
4451
4452 static const struct bpf_func_proto bpf_xdp_event_output_proto = {
4453         .func           = bpf_xdp_event_output,
4454         .gpl_only       = true,
4455         .ret_type       = RET_INTEGER,
4456         .arg1_type      = ARG_PTR_TO_CTX,
4457         .arg2_type      = ARG_CONST_MAP_PTR,
4458         .arg3_type      = ARG_ANYTHING,
4459         .arg4_type      = ARG_PTR_TO_MEM,
4460         .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
4461 };
4462
4463 BTF_ID_LIST_SINGLE(bpf_xdp_output_btf_ids, struct, xdp_buff)
4464
4465 const struct bpf_func_proto bpf_xdp_output_proto = {
4466         .func           = bpf_xdp_event_output,
4467         .gpl_only       = true,
4468         .ret_type       = RET_INTEGER,
4469         .arg1_type      = ARG_PTR_TO_BTF_ID,
4470         .arg1_btf_id    = &bpf_xdp_output_btf_ids[0],
4471         .arg2_type      = ARG_CONST_MAP_PTR,
4472         .arg3_type      = ARG_ANYTHING,
4473         .arg4_type      = ARG_PTR_TO_MEM,
4474         .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
4475 };
4476
4477 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb)
4478 {
4479         return skb->sk ? __sock_gen_cookie(skb->sk) : 0;
4480 }
4481
4482 static const struct bpf_func_proto bpf_get_socket_cookie_proto = {
4483         .func           = bpf_get_socket_cookie,
4484         .gpl_only       = false,
4485         .ret_type       = RET_INTEGER,
4486         .arg1_type      = ARG_PTR_TO_CTX,
4487 };
4488
4489 BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx)
4490 {
4491         return __sock_gen_cookie(ctx->sk);
4492 }
4493
4494 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = {
4495         .func           = bpf_get_socket_cookie_sock_addr,
4496         .gpl_only       = false,
4497         .ret_type       = RET_INTEGER,
4498         .arg1_type      = ARG_PTR_TO_CTX,
4499 };
4500
4501 BPF_CALL_1(bpf_get_socket_cookie_sock, struct sock *, ctx)
4502 {
4503         return __sock_gen_cookie(ctx);
4504 }
4505
4506 static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto = {
4507         .func           = bpf_get_socket_cookie_sock,
4508         .gpl_only       = false,
4509         .ret_type       = RET_INTEGER,
4510         .arg1_type      = ARG_PTR_TO_CTX,
4511 };
4512
4513 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx)
4514 {
4515         return __sock_gen_cookie(ctx->sk);
4516 }
4517
4518 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = {
4519         .func           = bpf_get_socket_cookie_sock_ops,
4520         .gpl_only       = false,
4521         .ret_type       = RET_INTEGER,
4522         .arg1_type      = ARG_PTR_TO_CTX,
4523 };
4524
4525 static u64 __bpf_get_netns_cookie(struct sock *sk)
4526 {
4527 #ifdef CONFIG_NET_NS
4528         return __net_gen_cookie(sk ? sk->sk_net.net : &init_net);
4529 #else
4530         return 0;
4531 #endif
4532 }
4533
4534 BPF_CALL_1(bpf_get_netns_cookie_sock, struct sock *, ctx)
4535 {
4536         return __bpf_get_netns_cookie(ctx);
4537 }
4538
4539 static const struct bpf_func_proto bpf_get_netns_cookie_sock_proto = {
4540         .func           = bpf_get_netns_cookie_sock,
4541         .gpl_only       = false,
4542         .ret_type       = RET_INTEGER,
4543         .arg1_type      = ARG_PTR_TO_CTX_OR_NULL,
4544 };
4545
4546 BPF_CALL_1(bpf_get_netns_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx)
4547 {
4548         return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL);
4549 }
4550
4551 static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto = {
4552         .func           = bpf_get_netns_cookie_sock_addr,
4553         .gpl_only       = false,
4554         .ret_type       = RET_INTEGER,
4555         .arg1_type      = ARG_PTR_TO_CTX_OR_NULL,
4556 };
4557
4558 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb)
4559 {
4560         struct sock *sk = sk_to_full_sk(skb->sk);
4561         kuid_t kuid;
4562
4563         if (!sk || !sk_fullsock(sk))
4564                 return overflowuid;
4565         kuid = sock_net_uid(sock_net(sk), sk);
4566         return from_kuid_munged(sock_net(sk)->user_ns, kuid);
4567 }
4568
4569 static const struct bpf_func_proto bpf_get_socket_uid_proto = {
4570         .func           = bpf_get_socket_uid,
4571         .gpl_only       = false,
4572         .ret_type       = RET_INTEGER,
4573         .arg1_type      = ARG_PTR_TO_CTX,
4574 };
4575
4576 static int _bpf_setsockopt(struct sock *sk, int level, int optname,
4577                            char *optval, int optlen)
4578 {
4579         char devname[IFNAMSIZ];
4580         int val, valbool;
4581         struct net *net;
4582         int ifindex;
4583         int ret = 0;
4584
4585         if (!sk_fullsock(sk))
4586                 return -EINVAL;
4587
4588         sock_owned_by_me(sk);
4589
4590         if (level == SOL_SOCKET) {
4591                 if (optlen != sizeof(int) && optname != SO_BINDTODEVICE)
4592                         return -EINVAL;
4593                 val = *((int *)optval);
4594                 valbool = val ? 1 : 0;
4595
4596                 /* Only some socketops are supported */
4597                 switch (optname) {
4598                 case SO_RCVBUF:
4599                         val = min_t(u32, val, sysctl_rmem_max);
4600                         sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
4601                         WRITE_ONCE(sk->sk_rcvbuf,
4602                                    max_t(int, val * 2, SOCK_MIN_RCVBUF));
4603                         break;
4604                 case SO_SNDBUF:
4605                         val = min_t(u32, val, sysctl_wmem_max);
4606                         sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
4607                         WRITE_ONCE(sk->sk_sndbuf,
4608                                    max_t(int, val * 2, SOCK_MIN_SNDBUF));
4609                         break;
4610                 case SO_MAX_PACING_RATE: /* 32bit version */
4611                         if (val != ~0U)
4612                                 cmpxchg(&sk->sk_pacing_status,
4613                                         SK_PACING_NONE,
4614                                         SK_PACING_NEEDED);
4615                         sk->sk_max_pacing_rate = (val == ~0U) ? ~0UL : val;
4616                         sk->sk_pacing_rate = min(sk->sk_pacing_rate,
4617                                                  sk->sk_max_pacing_rate);
4618                         break;
4619                 case SO_PRIORITY:
4620                         sk->sk_priority = val;
4621                         break;
4622                 case SO_RCVLOWAT:
4623                         if (val < 0)
4624                                 val = INT_MAX;
4625                         WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
4626                         break;
4627                 case SO_MARK:
4628                         if (sk->sk_mark != val) {
4629                                 sk->sk_mark = val;
4630                                 sk_dst_reset(sk);
4631                         }
4632                         break;
4633                 case SO_BINDTODEVICE:
4634                         optlen = min_t(long, optlen, IFNAMSIZ - 1);
4635                         strncpy(devname, optval, optlen);
4636                         devname[optlen] = 0;
4637
4638                         ifindex = 0;
4639                         if (devname[0] != '\0') {
4640                                 struct net_device *dev;
4641
4642                                 ret = -ENODEV;
4643
4644                                 net = sock_net(sk);
4645                                 dev = dev_get_by_name(net, devname);
4646                                 if (!dev)
4647                                         break;
4648                                 ifindex = dev->ifindex;
4649                                 dev_put(dev);
4650                         }
4651                         ret = sock_bindtoindex(sk, ifindex, false);
4652                         break;
4653                 case SO_KEEPALIVE:
4654                         if (sk->sk_prot->keepalive)
4655                                 sk->sk_prot->keepalive(sk, valbool);
4656                         sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
4657                         break;
4658                 default:
4659                         ret = -EINVAL;
4660                 }
4661 #ifdef CONFIG_INET
4662         } else if (level == SOL_IP) {
4663                 if (optlen != sizeof(int) || sk->sk_family != AF_INET)
4664                         return -EINVAL;
4665
4666                 val = *((int *)optval);
4667                 /* Only some options are supported */
4668                 switch (optname) {
4669                 case IP_TOS:
4670                         if (val < -1 || val > 0xff) {
4671                                 ret = -EINVAL;
4672                         } else {
4673                                 struct inet_sock *inet = inet_sk(sk);
4674
4675                                 if (val == -1)
4676                                         val = 0;
4677                                 inet->tos = val;
4678                         }
4679                         break;
4680                 default:
4681                         ret = -EINVAL;
4682                 }
4683 #if IS_ENABLED(CONFIG_IPV6)
4684         } else if (level == SOL_IPV6) {
4685                 if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
4686                         return -EINVAL;
4687
4688                 val = *((int *)optval);
4689                 /* Only some options are supported */
4690                 switch (optname) {
4691                 case IPV6_TCLASS:
4692                         if (val < -1 || val > 0xff) {
4693                                 ret = -EINVAL;
4694                         } else {
4695                                 struct ipv6_pinfo *np = inet6_sk(sk);
4696
4697                                 if (val == -1)
4698                                         val = 0;
4699                                 np->tclass = val;
4700                         }
4701                         break;
4702                 default:
4703                         ret = -EINVAL;
4704                 }
4705 #endif
4706         } else if (level == SOL_TCP &&
4707                    sk->sk_prot->setsockopt == tcp_setsockopt) {
4708                 if (optname == TCP_CONGESTION) {
4709                         char name[TCP_CA_NAME_MAX];
4710
4711                         strncpy(name, optval, min_t(long, optlen,
4712                                                     TCP_CA_NAME_MAX-1));
4713                         name[TCP_CA_NAME_MAX-1] = 0;
4714                         ret = tcp_set_congestion_control(sk, name, false, true);
4715                 } else {
4716                         struct inet_connection_sock *icsk = inet_csk(sk);
4717                         struct tcp_sock *tp = tcp_sk(sk);
4718                         unsigned long timeout;
4719
4720                         if (optlen != sizeof(int))
4721                                 return -EINVAL;
4722
4723                         val = *((int *)optval);
4724                         /* Only some options are supported */
4725                         switch (optname) {
4726                         case TCP_BPF_IW:
4727                                 if (val <= 0 || tp->data_segs_out > tp->syn_data)
4728                                         ret = -EINVAL;
4729                                 else
4730                                         tp->snd_cwnd = val;
4731                                 break;
4732                         case TCP_BPF_SNDCWND_CLAMP:
4733                                 if (val <= 0) {
4734                                         ret = -EINVAL;
4735                                 } else {
4736                                         tp->snd_cwnd_clamp = val;
4737                                         tp->snd_ssthresh = val;
4738                                 }
4739                                 break;
4740                         case TCP_BPF_DELACK_MAX:
4741                                 timeout = usecs_to_jiffies(val);
4742                                 if (timeout > TCP_DELACK_MAX ||
4743                                     timeout < TCP_TIMEOUT_MIN)
4744                                         return -EINVAL;
4745                                 inet_csk(sk)->icsk_delack_max = timeout;
4746                                 break;
4747                         case TCP_BPF_RTO_MIN:
4748                                 timeout = usecs_to_jiffies(val);
4749                                 if (timeout > TCP_RTO_MIN ||
4750                                     timeout < TCP_TIMEOUT_MIN)
4751                                         return -EINVAL;
4752                                 inet_csk(sk)->icsk_rto_min = timeout;
4753                                 break;
4754                         case TCP_SAVE_SYN:
4755                                 if (val < 0 || val > 1)
4756                                         ret = -EINVAL;
4757                                 else
4758                                         tp->save_syn = val;
4759                                 break;
4760                         case TCP_KEEPIDLE:
4761                                 ret = tcp_sock_set_keepidle_locked(sk, val);
4762                                 break;
4763                         case TCP_KEEPINTVL:
4764                                 if (val < 1 || val > MAX_TCP_KEEPINTVL)
4765                                         ret = -EINVAL;
4766                                 else
4767                                         tp->keepalive_intvl = val * HZ;
4768                                 break;
4769                         case TCP_KEEPCNT:
4770                                 if (val < 1 || val > MAX_TCP_KEEPCNT)
4771                                         ret = -EINVAL;
4772                                 else
4773                                         tp->keepalive_probes = val;
4774                                 break;
4775                         case TCP_SYNCNT:
4776                                 if (val < 1 || val > MAX_TCP_SYNCNT)
4777                                         ret = -EINVAL;
4778                                 else
4779                                         icsk->icsk_syn_retries = val;
4780                                 break;
4781                         case TCP_USER_TIMEOUT:
4782                                 if (val < 0)
4783                                         ret = -EINVAL;
4784                                 else
4785                                         icsk->icsk_user_timeout = val;
4786                                 break;
4787                         default:
4788                                 ret = -EINVAL;
4789                         }
4790                 }
4791 #endif
4792         } else {
4793                 ret = -EINVAL;
4794         }
4795         return ret;
4796 }
4797
4798 static int _bpf_getsockopt(struct sock *sk, int level, int optname,
4799                            char *optval, int optlen)
4800 {
4801         if (!sk_fullsock(sk))
4802                 goto err_clear;
4803
4804         sock_owned_by_me(sk);
4805
4806 #ifdef CONFIG_INET
4807         if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) {
4808                 struct inet_connection_sock *icsk;
4809                 struct tcp_sock *tp;
4810
4811                 switch (optname) {
4812                 case TCP_CONGESTION:
4813                         icsk = inet_csk(sk);
4814
4815                         if (!icsk->icsk_ca_ops || optlen <= 1)
4816                                 goto err_clear;
4817                         strncpy(optval, icsk->icsk_ca_ops->name, optlen);
4818                         optval[optlen - 1] = 0;
4819                         break;
4820                 case TCP_SAVED_SYN:
4821                         tp = tcp_sk(sk);
4822
4823                         if (optlen <= 0 || !tp->saved_syn ||
4824                             optlen > tcp_saved_syn_len(tp->saved_syn))
4825                                 goto err_clear;
4826                         memcpy(optval, tp->saved_syn->data, optlen);
4827                         break;
4828                 default:
4829                         goto err_clear;
4830                 }
4831         } else if (level == SOL_IP) {
4832                 struct inet_sock *inet = inet_sk(sk);
4833
4834                 if (optlen != sizeof(int) || sk->sk_family != AF_INET)
4835                         goto err_clear;
4836
4837                 /* Only some options are supported */
4838                 switch (optname) {
4839                 case IP_TOS:
4840                         *((int *)optval) = (int)inet->tos;
4841                         break;
4842                 default:
4843                         goto err_clear;
4844                 }
4845 #if IS_ENABLED(CONFIG_IPV6)
4846         } else if (level == SOL_IPV6) {
4847                 struct ipv6_pinfo *np = inet6_sk(sk);
4848
4849                 if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
4850                         goto err_clear;
4851
4852                 /* Only some options are supported */
4853                 switch (optname) {
4854                 case IPV6_TCLASS:
4855                         *((int *)optval) = (int)np->tclass;
4856                         break;
4857                 default:
4858                         goto err_clear;
4859                 }
4860 #endif
4861         } else {
4862                 goto err_clear;
4863         }
4864         return 0;
4865 #endif
4866 err_clear:
4867         memset(optval, 0, optlen);
4868         return -EINVAL;
4869 }
4870
4871 BPF_CALL_5(bpf_sock_addr_setsockopt, struct bpf_sock_addr_kern *, ctx,
4872            int, level, int, optname, char *, optval, int, optlen)
4873 {
4874         return _bpf_setsockopt(ctx->sk, level, optname, optval, optlen);
4875 }
4876
4877 static const struct bpf_func_proto bpf_sock_addr_setsockopt_proto = {
4878         .func           = bpf_sock_addr_setsockopt,
4879         .gpl_only       = false,
4880         .ret_type       = RET_INTEGER,
4881         .arg1_type      = ARG_PTR_TO_CTX,
4882         .arg2_type      = ARG_ANYTHING,
4883         .arg3_type      = ARG_ANYTHING,
4884         .arg4_type      = ARG_PTR_TO_MEM,
4885         .arg5_type      = ARG_CONST_SIZE,
4886 };
4887
4888 BPF_CALL_5(bpf_sock_addr_getsockopt, struct bpf_sock_addr_kern *, ctx,
4889            int, level, int, optname, char *, optval, int, optlen)
4890 {
4891         return _bpf_getsockopt(ctx->sk, level, optname, optval, optlen);
4892 }
4893
4894 static const struct bpf_func_proto bpf_sock_addr_getsockopt_proto = {
4895         .func           = bpf_sock_addr_getsockopt,
4896         .gpl_only       = false,
4897         .ret_type       = RET_INTEGER,
4898         .arg1_type      = ARG_PTR_TO_CTX,
4899         .arg2_type      = ARG_ANYTHING,
4900         .arg3_type      = ARG_ANYTHING,
4901         .arg4_type      = ARG_PTR_TO_UNINIT_MEM,
4902         .arg5_type      = ARG_CONST_SIZE,
4903 };
4904
4905 BPF_CALL_5(bpf_sock_ops_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
4906            int, level, int, optname, char *, optval, int, optlen)
4907 {
4908         return _bpf_setsockopt(bpf_sock->sk, level, optname, optval, optlen);
4909 }
4910
4911 static const struct bpf_func_proto bpf_sock_ops_setsockopt_proto = {
4912         .func           = bpf_sock_ops_setsockopt,
4913         .gpl_only       = false,
4914         .ret_type       = RET_INTEGER,
4915         .arg1_type      = ARG_PTR_TO_CTX,
4916         .arg2_type      = ARG_ANYTHING,
4917         .arg3_type      = ARG_ANYTHING,
4918         .arg4_type      = ARG_PTR_TO_MEM,
4919         .arg5_type      = ARG_CONST_SIZE,
4920 };
4921
4922 static int bpf_sock_ops_get_syn(struct bpf_sock_ops_kern *bpf_sock,
4923                                 int optname, const u8 **start)
4924 {
4925         struct sk_buff *syn_skb = bpf_sock->syn_skb;
4926         const u8 *hdr_start;
4927         int ret;
4928
4929         if (syn_skb) {
4930                 /* sk is a request_sock here */
4931
4932                 if (optname == TCP_BPF_SYN) {
4933                         hdr_start = syn_skb->data;
4934                         ret = tcp_hdrlen(syn_skb);
4935                 } else if (optname == TCP_BPF_SYN_IP) {
4936                         hdr_start = skb_network_header(syn_skb);
4937                         ret = skb_network_header_len(syn_skb) +
4938                                 tcp_hdrlen(syn_skb);
4939                 } else {
4940                         /* optname == TCP_BPF_SYN_MAC */
4941                         hdr_start = skb_mac_header(syn_skb);
4942                         ret = skb_mac_header_len(syn_skb) +
4943                                 skb_network_header_len(syn_skb) +
4944                                 tcp_hdrlen(syn_skb);
4945                 }
4946         } else {
4947                 struct sock *sk = bpf_sock->sk;
4948                 struct saved_syn *saved_syn;
4949
4950                 if (sk->sk_state == TCP_NEW_SYN_RECV)
4951                         /* synack retransmit. bpf_sock->syn_skb will
4952                          * not be available.  It has to resort to
4953                          * saved_syn (if it is saved).
4954                          */
4955                         saved_syn = inet_reqsk(sk)->saved_syn;
4956                 else
4957                         saved_syn = tcp_sk(sk)->saved_syn;
4958
4959                 if (!saved_syn)
4960                         return -ENOENT;
4961
4962                 if (optname == TCP_BPF_SYN) {
4963                         hdr_start = saved_syn->data +
4964                                 saved_syn->mac_hdrlen +
4965                                 saved_syn->network_hdrlen;
4966                         ret = saved_syn->tcp_hdrlen;
4967                 } else if (optname == TCP_BPF_SYN_IP) {
4968                         hdr_start = saved_syn->data +
4969                                 saved_syn->mac_hdrlen;
4970                         ret = saved_syn->network_hdrlen +
4971                                 saved_syn->tcp_hdrlen;
4972                 } else {
4973                         /* optname == TCP_BPF_SYN_MAC */
4974
4975                         /* TCP_SAVE_SYN may not have saved the mac hdr */
4976                         if (!saved_syn->mac_hdrlen)
4977                                 return -ENOENT;
4978
4979                         hdr_start = saved_syn->data;
4980                         ret = saved_syn->mac_hdrlen +
4981                                 saved_syn->network_hdrlen +
4982                                 saved_syn->tcp_hdrlen;
4983                 }
4984         }
4985
4986         *start = hdr_start;
4987         return ret;
4988 }
4989
4990 BPF_CALL_5(bpf_sock_ops_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
4991            int, level, int, optname, char *, optval, int, optlen)
4992 {
4993         if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP &&
4994             optname >= TCP_BPF_SYN && optname <= TCP_BPF_SYN_MAC) {
4995                 int ret, copy_len = 0;
4996                 const u8 *start;
4997
4998                 ret = bpf_sock_ops_get_syn(bpf_sock, optname, &start);
4999                 if (ret > 0) {
5000                         copy_len = ret;
5001                         if (optlen < copy_len) {
5002                                 copy_len = optlen;
5003                                 ret = -ENOSPC;
5004                         }
5005
5006                         memcpy(optval, start, copy_len);
5007                 }
5008
5009                 /* Zero out unused buffer at the end */
5010                 memset(optval + copy_len, 0, optlen - copy_len);
5011
5012                 return ret;
5013         }
5014
5015         return _bpf_getsockopt(bpf_sock->sk, level, optname, optval, optlen);
5016 }
5017
5018 static const struct bpf_func_proto bpf_sock_ops_getsockopt_proto = {
5019         .func           = bpf_sock_ops_getsockopt,
5020         .gpl_only       = false,
5021         .ret_type       = RET_INTEGER,
5022         .arg1_type      = ARG_PTR_TO_CTX,
5023         .arg2_type      = ARG_ANYTHING,
5024         .arg3_type      = ARG_ANYTHING,
5025         .arg4_type      = ARG_PTR_TO_UNINIT_MEM,
5026         .arg5_type      = ARG_CONST_SIZE,
5027 };
5028
5029 BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock,
5030            int, argval)
5031 {
5032         struct sock *sk = bpf_sock->sk;
5033         int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS;
5034
5035         if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk))
5036                 return -EINVAL;
5037
5038         tcp_sk(sk)->bpf_sock_ops_cb_flags = val;
5039
5040         return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS);
5041 }
5042
5043 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = {
5044         .func           = bpf_sock_ops_cb_flags_set,
5045         .gpl_only       = false,
5046         .ret_type       = RET_INTEGER,
5047         .arg1_type      = ARG_PTR_TO_CTX,
5048         .arg2_type      = ARG_ANYTHING,
5049 };
5050
5051 const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
5052 EXPORT_SYMBOL_GPL(ipv6_bpf_stub);
5053
5054 BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr,
5055            int, addr_len)
5056 {
5057 #ifdef CONFIG_INET
5058         struct sock *sk = ctx->sk;
5059         u32 flags = BIND_FROM_BPF;
5060         int err;
5061
5062         err = -EINVAL;
5063         if (addr_len < offsetofend(struct sockaddr, sa_family))
5064                 return err;
5065         if (addr->sa_family == AF_INET) {
5066                 if (addr_len < sizeof(struct sockaddr_in))
5067                         return err;
5068                 if (((struct sockaddr_in *)addr)->sin_port == htons(0))
5069                         flags |= BIND_FORCE_ADDRESS_NO_PORT;
5070                 return __inet_bind(sk, addr, addr_len, flags);
5071 #if IS_ENABLED(CONFIG_IPV6)
5072         } else if (addr->sa_family == AF_INET6) {
5073                 if (addr_len < SIN6_LEN_RFC2133)
5074                         return err;
5075                 if (((struct sockaddr_in6 *)addr)->sin6_port == htons(0))
5076                         flags |= BIND_FORCE_ADDRESS_NO_PORT;
5077                 /* ipv6_bpf_stub cannot be NULL, since it's called from
5078                  * bpf_cgroup_inet6_connect hook and ipv6 is already loaded
5079                  */
5080                 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, flags);
5081 #endif /* CONFIG_IPV6 */
5082         }
5083 #endif /* CONFIG_INET */
5084
5085         return -EAFNOSUPPORT;
5086 }
5087
5088 static const struct bpf_func_proto bpf_bind_proto = {
5089         .func           = bpf_bind,
5090         .gpl_only       = false,
5091         .ret_type       = RET_INTEGER,
5092         .arg1_type      = ARG_PTR_TO_CTX,
5093         .arg2_type      = ARG_PTR_TO_MEM,
5094         .arg3_type      = ARG_CONST_SIZE,
5095 };
5096
5097 #ifdef CONFIG_XFRM
5098 BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index,
5099            struct bpf_xfrm_state *, to, u32, size, u64, flags)
5100 {
5101         const struct sec_path *sp = skb_sec_path(skb);
5102         const struct xfrm_state *x;
5103
5104         if (!sp || unlikely(index >= sp->len || flags))
5105                 goto err_clear;
5106
5107         x = sp->xvec[index];
5108
5109         if (unlikely(size != sizeof(struct bpf_xfrm_state)))
5110                 goto err_clear;
5111
5112         to->reqid = x->props.reqid;
5113         to->spi = x->id.spi;
5114         to->family = x->props.family;
5115         to->ext = 0;
5116
5117         if (to->family == AF_INET6) {
5118                 memcpy(to->remote_ipv6, x->props.saddr.a6,
5119                        sizeof(to->remote_ipv6));
5120         } else {
5121                 to->remote_ipv4 = x->props.saddr.a4;
5122                 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3);
5123         }
5124
5125         return 0;
5126 err_clear:
5127         memset(to, 0, size);
5128         return -EINVAL;
5129 }
5130
5131 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = {
5132         .func           = bpf_skb_get_xfrm_state,
5133         .gpl_only       = false,
5134         .ret_type       = RET_INTEGER,
5135         .arg1_type      = ARG_PTR_TO_CTX,
5136         .arg2_type      = ARG_ANYTHING,
5137         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
5138         .arg4_type      = ARG_CONST_SIZE,
5139         .arg5_type      = ARG_ANYTHING,
5140 };
5141 #endif
5142
5143 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6)
5144 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params,
5145                                   const struct neighbour *neigh,
5146                                   const struct net_device *dev)
5147 {
5148         memcpy(params->dmac, neigh->ha, ETH_ALEN);
5149         memcpy(params->smac, dev->dev_addr, ETH_ALEN);
5150         params->h_vlan_TCI = 0;
5151         params->h_vlan_proto = 0;
5152         params->ifindex = dev->ifindex;
5153
5154         return 0;
5155 }
5156 #endif
5157
5158 #if IS_ENABLED(CONFIG_INET)
5159 static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
5160                                u32 flags, bool check_mtu)
5161 {
5162         struct fib_nh_common *nhc;
5163         struct in_device *in_dev;
5164         struct neighbour *neigh;
5165         struct net_device *dev;
5166         struct fib_result res;
5167         struct flowi4 fl4;
5168         int err;
5169         u32 mtu;
5170
5171         dev = dev_get_by_index_rcu(net, params->ifindex);
5172         if (unlikely(!dev))
5173                 return -ENODEV;
5174
5175         /* verify forwarding is enabled on this interface */
5176         in_dev = __in_dev_get_rcu(dev);
5177         if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev)))
5178                 return BPF_FIB_LKUP_RET_FWD_DISABLED;
5179
5180         if (flags & BPF_FIB_LOOKUP_OUTPUT) {
5181                 fl4.flowi4_iif = 1;
5182                 fl4.flowi4_oif = params->ifindex;
5183         } else {
5184                 fl4.flowi4_iif = params->ifindex;
5185                 fl4.flowi4_oif = 0;
5186         }
5187         fl4.flowi4_tos = params->tos & IPTOS_RT_MASK;
5188         fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
5189         fl4.flowi4_flags = 0;
5190
5191         fl4.flowi4_proto = params->l4_protocol;
5192         fl4.daddr = params->ipv4_dst;
5193         fl4.saddr = params->ipv4_src;
5194         fl4.fl4_sport = params->sport;
5195         fl4.fl4_dport = params->dport;
5196         fl4.flowi4_multipath_hash = 0;
5197
5198         if (flags & BPF_FIB_LOOKUP_DIRECT) {
5199                 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
5200                 struct fib_table *tb;
5201
5202                 tb = fib_get_table(net, tbid);
5203                 if (unlikely(!tb))
5204                         return BPF_FIB_LKUP_RET_NOT_FWDED;
5205
5206                 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
5207         } else {
5208                 fl4.flowi4_mark = 0;
5209                 fl4.flowi4_secid = 0;
5210                 fl4.flowi4_tun_key.tun_id = 0;
5211                 fl4.flowi4_uid = sock_net_uid(net, NULL);
5212
5213                 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF);
5214         }
5215
5216         if (err) {
5217                 /* map fib lookup errors to RTN_ type */
5218                 if (err == -EINVAL)
5219                         return BPF_FIB_LKUP_RET_BLACKHOLE;
5220                 if (err == -EHOSTUNREACH)
5221                         return BPF_FIB_LKUP_RET_UNREACHABLE;
5222                 if (err == -EACCES)
5223                         return BPF_FIB_LKUP_RET_PROHIBIT;
5224
5225                 return BPF_FIB_LKUP_RET_NOT_FWDED;
5226         }
5227
5228         if (res.type != RTN_UNICAST)
5229                 return BPF_FIB_LKUP_RET_NOT_FWDED;
5230
5231         if (fib_info_num_path(res.fi) > 1)
5232                 fib_select_path(net, &res, &fl4, NULL);
5233
5234         if (check_mtu) {
5235                 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst);
5236                 if (params->tot_len > mtu)
5237                         return BPF_FIB_LKUP_RET_FRAG_NEEDED;
5238         }
5239
5240         nhc = res.nhc;
5241
5242         /* do not handle lwt encaps right now */
5243         if (nhc->nhc_lwtstate)
5244                 return BPF_FIB_LKUP_RET_UNSUPP_LWT;
5245
5246         dev = nhc->nhc_dev;
5247
5248         params->rt_metric = res.fi->fib_priority;
5249
5250         /* xdp and cls_bpf programs are run in RCU-bh so
5251          * rcu_read_lock_bh is not needed here
5252          */
5253         if (likely(nhc->nhc_gw_family != AF_INET6)) {
5254                 if (nhc->nhc_gw_family)
5255                         params->ipv4_dst = nhc->nhc_gw.ipv4;
5256
5257                 neigh = __ipv4_neigh_lookup_noref(dev,
5258                                                  (__force u32)params->ipv4_dst);
5259         } else {
5260                 struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst;
5261
5262                 params->family = AF_INET6;
5263                 *dst = nhc->nhc_gw.ipv6;
5264                 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst);
5265         }
5266
5267         if (!neigh)
5268                 return BPF_FIB_LKUP_RET_NO_NEIGH;
5269
5270         return bpf_fib_set_fwd_params(params, neigh, dev);
5271 }
5272 #endif
5273
5274 #if IS_ENABLED(CONFIG_IPV6)
5275 static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
5276                                u32 flags, bool check_mtu)
5277 {
5278         struct in6_addr *src = (struct in6_addr *) params->ipv6_src;
5279         struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst;
5280         struct fib6_result res = {};
5281         struct neighbour *neigh;
5282         struct net_device *dev;
5283         struct inet6_dev *idev;
5284         struct flowi6 fl6;
5285         int strict = 0;
5286         int oif, err;
5287         u32 mtu;
5288
5289         /* link local addresses are never forwarded */
5290         if (rt6_need_strict(dst) || rt6_need_strict(src))
5291                 return BPF_FIB_LKUP_RET_NOT_FWDED;
5292
5293         dev = dev_get_by_index_rcu(net, params->ifindex);
5294         if (unlikely(!dev))
5295                 return -ENODEV;
5296
5297         idev = __in6_dev_get_safely(dev);
5298         if (unlikely(!idev || !idev->cnf.forwarding))
5299                 return BPF_FIB_LKUP_RET_FWD_DISABLED;
5300
5301         if (flags & BPF_FIB_LOOKUP_OUTPUT) {
5302                 fl6.flowi6_iif = 1;
5303                 oif = fl6.flowi6_oif = params->ifindex;
5304         } else {
5305                 oif = fl6.flowi6_iif = params->ifindex;
5306                 fl6.flowi6_oif = 0;
5307                 strict = RT6_LOOKUP_F_HAS_SADDR;
5308         }
5309         fl6.flowlabel = params->flowinfo;
5310         fl6.flowi6_scope = 0;
5311         fl6.flowi6_flags = 0;
5312         fl6.mp_hash = 0;
5313
5314         fl6.flowi6_proto = params->l4_protocol;
5315         fl6.daddr = *dst;
5316         fl6.saddr = *src;
5317         fl6.fl6_sport = params->sport;
5318         fl6.fl6_dport = params->dport;
5319
5320         if (flags & BPF_FIB_LOOKUP_DIRECT) {
5321                 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
5322                 struct fib6_table *tb;
5323
5324                 tb = ipv6_stub->fib6_get_table(net, tbid);
5325                 if (unlikely(!tb))
5326                         return BPF_FIB_LKUP_RET_NOT_FWDED;
5327
5328                 err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res,
5329                                                    strict);
5330         } else {
5331                 fl6.flowi6_mark = 0;
5332                 fl6.flowi6_secid = 0;
5333                 fl6.flowi6_tun_key.tun_id = 0;
5334                 fl6.flowi6_uid = sock_net_uid(net, NULL);
5335
5336                 err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict);
5337         }
5338
5339         if (unlikely(err || IS_ERR_OR_NULL(res.f6i) ||
5340                      res.f6i == net->ipv6.fib6_null_entry))
5341                 return BPF_FIB_LKUP_RET_NOT_FWDED;
5342
5343         switch (res.fib6_type) {
5344         /* only unicast is forwarded */
5345         case RTN_UNICAST:
5346                 break;
5347         case RTN_BLACKHOLE:
5348                 return BPF_FIB_LKUP_RET_BLACKHOLE;
5349         case RTN_UNREACHABLE:
5350                 return BPF_FIB_LKUP_RET_UNREACHABLE;
5351         case RTN_PROHIBIT:
5352                 return BPF_FIB_LKUP_RET_PROHIBIT;
5353         default:
5354                 return BPF_FIB_LKUP_RET_NOT_FWDED;
5355         }
5356
5357         ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif,
5358                                     fl6.flowi6_oif != 0, NULL, strict);
5359
5360         if (check_mtu) {
5361                 mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src);
5362                 if (params->tot_len > mtu)
5363                         return BPF_FIB_LKUP_RET_FRAG_NEEDED;
5364         }
5365
5366         if (res.nh->fib_nh_lws)
5367                 return BPF_FIB_LKUP_RET_UNSUPP_LWT;
5368
5369         if (res.nh->fib_nh_gw_family)
5370                 *dst = res.nh->fib_nh_gw6;
5371
5372         dev = res.nh->fib_nh_dev;
5373         params->rt_metric = res.f6i->fib6_metric;
5374
5375         /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is
5376          * not needed here.
5377          */
5378         neigh = __ipv6_neigh_lookup_noref_stub(dev, dst);
5379         if (!neigh)
5380                 return BPF_FIB_LKUP_RET_NO_NEIGH;
5381
5382         return bpf_fib_set_fwd_params(params, neigh, dev);
5383 }
5384 #endif
5385
5386 BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx,
5387            struct bpf_fib_lookup *, params, int, plen, u32, flags)
5388 {
5389         if (plen < sizeof(*params))
5390                 return -EINVAL;
5391
5392         if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
5393                 return -EINVAL;
5394
5395         switch (params->family) {
5396 #if IS_ENABLED(CONFIG_INET)
5397         case AF_INET:
5398                 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params,
5399                                            flags, true);
5400 #endif
5401 #if IS_ENABLED(CONFIG_IPV6)
5402         case AF_INET6:
5403                 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params,
5404                                            flags, true);
5405 #endif
5406         }
5407         return -EAFNOSUPPORT;
5408 }
5409
5410 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = {
5411         .func           = bpf_xdp_fib_lookup,
5412         .gpl_only       = true,
5413         .ret_type       = RET_INTEGER,
5414         .arg1_type      = ARG_PTR_TO_CTX,
5415         .arg2_type      = ARG_PTR_TO_MEM,
5416         .arg3_type      = ARG_CONST_SIZE,
5417         .arg4_type      = ARG_ANYTHING,
5418 };
5419
5420 BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb,
5421            struct bpf_fib_lookup *, params, int, plen, u32, flags)
5422 {
5423         struct net *net = dev_net(skb->dev);
5424         int rc = -EAFNOSUPPORT;
5425
5426         if (plen < sizeof(*params))
5427                 return -EINVAL;
5428
5429         if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
5430                 return -EINVAL;
5431
5432         switch (params->family) {
5433 #if IS_ENABLED(CONFIG_INET)
5434         case AF_INET:
5435                 rc = bpf_ipv4_fib_lookup(net, params, flags, false);
5436                 break;
5437 #endif
5438 #if IS_ENABLED(CONFIG_IPV6)
5439         case AF_INET6:
5440                 rc = bpf_ipv6_fib_lookup(net, params, flags, false);
5441                 break;
5442 #endif
5443         }
5444
5445         if (!rc) {
5446                 struct net_device *dev;
5447
5448                 dev = dev_get_by_index_rcu(net, params->ifindex);
5449                 if (!is_skb_forwardable(dev, skb))
5450                         rc = BPF_FIB_LKUP_RET_FRAG_NEEDED;
5451         }
5452
5453         return rc;
5454 }
5455
5456 static const struct bpf_func_proto bpf_skb_fib_lookup_proto = {
5457         .func           = bpf_skb_fib_lookup,
5458         .gpl_only       = true,
5459         .ret_type       = RET_INTEGER,
5460         .arg1_type      = ARG_PTR_TO_CTX,
5461         .arg2_type      = ARG_PTR_TO_MEM,
5462         .arg3_type      = ARG_CONST_SIZE,
5463         .arg4_type      = ARG_ANYTHING,
5464 };
5465
5466 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
5467 static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len)
5468 {
5469         int err;
5470         struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr;
5471
5472         if (!seg6_validate_srh(srh, len, false))
5473                 return -EINVAL;
5474
5475         switch (type) {
5476         case BPF_LWT_ENCAP_SEG6_INLINE:
5477                 if (skb->protocol != htons(ETH_P_IPV6))
5478                         return -EBADMSG;
5479
5480                 err = seg6_do_srh_inline(skb, srh);
5481                 break;
5482         case BPF_LWT_ENCAP_SEG6:
5483                 skb_reset_inner_headers(skb);
5484                 skb->encapsulation = 1;
5485                 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6);
5486                 break;
5487         default:
5488                 return -EINVAL;
5489         }
5490
5491         bpf_compute_data_pointers(skb);
5492         if (err)
5493                 return err;
5494
5495         ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
5496         skb_set_transport_header(skb, sizeof(struct ipv6hdr));
5497
5498         return seg6_lookup_nexthop(skb, NULL, 0);
5499 }
5500 #endif /* CONFIG_IPV6_SEG6_BPF */
5501
5502 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
5503 static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len,
5504                              bool ingress)
5505 {
5506         return bpf_lwt_push_ip_encap(skb, hdr, len, ingress);
5507 }
5508 #endif
5509
5510 BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr,
5511            u32, len)
5512 {
5513         switch (type) {
5514 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
5515         case BPF_LWT_ENCAP_SEG6:
5516         case BPF_LWT_ENCAP_SEG6_INLINE:
5517                 return bpf_push_seg6_encap(skb, type, hdr, len);
5518 #endif
5519 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
5520         case BPF_LWT_ENCAP_IP:
5521                 return bpf_push_ip_encap(skb, hdr, len, true /* ingress */);
5522 #endif
5523         default:
5524                 return -EINVAL;
5525         }
5526 }
5527
5528 BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type,
5529            void *, hdr, u32, len)
5530 {
5531         switch (type) {
5532 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
5533         case BPF_LWT_ENCAP_IP:
5534                 return bpf_push_ip_encap(skb, hdr, len, false /* egress */);
5535 #endif
5536         default:
5537                 return -EINVAL;
5538         }
5539 }
5540
5541 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = {
5542         .func           = bpf_lwt_in_push_encap,
5543         .gpl_only       = false,
5544         .ret_type       = RET_INTEGER,
5545         .arg1_type      = ARG_PTR_TO_CTX,
5546         .arg2_type      = ARG_ANYTHING,
5547         .arg3_type      = ARG_PTR_TO_MEM,
5548         .arg4_type      = ARG_CONST_SIZE
5549 };
5550
5551 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = {
5552         .func           = bpf_lwt_xmit_push_encap,
5553         .gpl_only       = false,
5554         .ret_type       = RET_INTEGER,
5555         .arg1_type      = ARG_PTR_TO_CTX,
5556         .arg2_type      = ARG_ANYTHING,
5557         .arg3_type      = ARG_PTR_TO_MEM,
5558         .arg4_type      = ARG_CONST_SIZE
5559 };
5560
5561 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
5562 BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset,
5563            const void *, from, u32, len)
5564 {
5565         struct seg6_bpf_srh_state *srh_state =
5566                 this_cpu_ptr(&seg6_bpf_srh_states);
5567         struct ipv6_sr_hdr *srh = srh_state->srh;
5568         void *srh_tlvs, *srh_end, *ptr;
5569         int srhoff = 0;
5570
5571         if (srh == NULL)
5572                 return -EINVAL;
5573
5574         srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4));
5575         srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen);
5576
5577         ptr = skb->data + offset;
5578         if (ptr >= srh_tlvs && ptr + len <= srh_end)
5579                 srh_state->valid = false;
5580         else if (ptr < (void *)&srh->flags ||
5581                  ptr + len > (void *)&srh->segments)
5582                 return -EFAULT;
5583
5584         if (unlikely(bpf_try_make_writable(skb, offset + len)))
5585                 return -EFAULT;
5586         if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
5587                 return -EINVAL;
5588         srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
5589
5590         memcpy(skb->data + offset, from, len);
5591         return 0;
5592 }
5593
5594 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = {
5595         .func           = bpf_lwt_seg6_store_bytes,
5596         .gpl_only       = false,
5597         .ret_type       = RET_INTEGER,
5598         .arg1_type      = ARG_PTR_TO_CTX,
5599         .arg2_type      = ARG_ANYTHING,
5600         .arg3_type      = ARG_PTR_TO_MEM,
5601         .arg4_type      = ARG_CONST_SIZE
5602 };
5603
5604 static void bpf_update_srh_state(struct sk_buff *skb)
5605 {
5606         struct seg6_bpf_srh_state *srh_state =
5607                 this_cpu_ptr(&seg6_bpf_srh_states);
5608         int srhoff = 0;
5609
5610         if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) {
5611                 srh_state->srh = NULL;
5612         } else {
5613                 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
5614                 srh_state->hdrlen = srh_state->srh->hdrlen << 3;
5615                 srh_state->valid = true;
5616         }
5617 }
5618
5619 BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb,
5620            u32, action, void *, param, u32, param_len)
5621 {
5622         struct seg6_bpf_srh_state *srh_state =
5623                 this_cpu_ptr(&seg6_bpf_srh_states);
5624         int hdroff = 0;
5625         int err;
5626
5627         switch (action) {
5628         case SEG6_LOCAL_ACTION_END_X:
5629                 if (!seg6_bpf_has_valid_srh(skb))
5630                         return -EBADMSG;
5631                 if (param_len != sizeof(struct in6_addr))
5632                         return -EINVAL;
5633                 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0);
5634         case SEG6_LOCAL_ACTION_END_T:
5635                 if (!seg6_bpf_has_valid_srh(skb))
5636                         return -EBADMSG;
5637                 if (param_len != sizeof(int))
5638                         return -EINVAL;
5639                 return seg6_lookup_nexthop(skb, NULL, *(int *)param);
5640         case SEG6_LOCAL_ACTION_END_DT6:
5641                 if (!seg6_bpf_has_valid_srh(skb))
5642                         return -EBADMSG;
5643                 if (param_len != sizeof(int))
5644                         return -EINVAL;
5645
5646                 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0)
5647                         return -EBADMSG;
5648                 if (!pskb_pull(skb, hdroff))
5649                         return -EBADMSG;
5650
5651                 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff);
5652                 skb_reset_network_header(skb);
5653                 skb_reset_transport_header(skb);
5654                 skb->encapsulation = 0;
5655
5656                 bpf_compute_data_pointers(skb);
5657                 bpf_update_srh_state(skb);
5658                 return seg6_lookup_nexthop(skb, NULL, *(int *)param);
5659         case SEG6_LOCAL_ACTION_END_B6:
5660                 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
5661                         return -EBADMSG;
5662                 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE,
5663                                           param, param_len);
5664                 if (!err)
5665                         bpf_update_srh_state(skb);
5666
5667                 return err;
5668         case SEG6_LOCAL_ACTION_END_B6_ENCAP:
5669                 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
5670                         return -EBADMSG;
5671                 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6,
5672                                           param, param_len);
5673                 if (!err)
5674                         bpf_update_srh_state(skb);
5675
5676                 return err;
5677         default:
5678                 return -EINVAL;
5679         }
5680 }
5681
5682 static const struct bpf_func_proto bpf_lwt_seg6_action_proto = {
5683         .func           = bpf_lwt_seg6_action,
5684         .gpl_only       = false,
5685         .ret_type       = RET_INTEGER,
5686         .arg1_type      = ARG_PTR_TO_CTX,
5687         .arg2_type      = ARG_ANYTHING,
5688         .arg3_type      = ARG_PTR_TO_MEM,
5689         .arg4_type      = ARG_CONST_SIZE
5690 };
5691
5692 BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset,
5693            s32, len)
5694 {
5695         struct seg6_bpf_srh_state *srh_state =
5696                 this_cpu_ptr(&seg6_bpf_srh_states);
5697         struct ipv6_sr_hdr *srh = srh_state->srh;
5698         void *srh_end, *srh_tlvs, *ptr;
5699         struct ipv6hdr *hdr;
5700         int srhoff = 0;
5701         int ret;
5702
5703         if (unlikely(srh == NULL))
5704                 return -EINVAL;
5705
5706         srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) +
5707                         ((srh->first_segment + 1) << 4));
5708         srh_end = (void *)((unsigned char *)srh + sizeof(*srh) +
5709                         srh_state->hdrlen);
5710         ptr = skb->data + offset;
5711
5712         if (unlikely(ptr < srh_tlvs || ptr > srh_end))
5713                 return -EFAULT;
5714         if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end))
5715                 return -EFAULT;
5716
5717         if (len > 0) {
5718                 ret = skb_cow_head(skb, len);
5719                 if (unlikely(ret < 0))
5720                         return ret;
5721
5722                 ret = bpf_skb_net_hdr_push(skb, offset, len);
5723         } else {
5724                 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len);
5725         }
5726
5727         bpf_compute_data_pointers(skb);
5728         if (unlikely(ret < 0))
5729                 return ret;
5730
5731         hdr = (struct ipv6hdr *)skb->data;
5732         hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
5733
5734         if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
5735                 return -EINVAL;
5736         srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
5737         srh_state->hdrlen += len;
5738         srh_state->valid = false;
5739         return 0;
5740 }
5741
5742 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = {
5743         .func           = bpf_lwt_seg6_adjust_srh,
5744         .gpl_only       = false,
5745         .ret_type       = RET_INTEGER,
5746         .arg1_type      = ARG_PTR_TO_CTX,
5747         .arg2_type      = ARG_ANYTHING,
5748         .arg3_type      = ARG_ANYTHING,
5749 };
5750 #endif /* CONFIG_IPV6_SEG6_BPF */
5751
5752 #ifdef CONFIG_INET
5753 static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple,
5754                               int dif, int sdif, u8 family, u8 proto)
5755 {
5756         bool refcounted = false;
5757         struct sock *sk = NULL;
5758
5759         if (family == AF_INET) {
5760                 __be32 src4 = tuple->ipv4.saddr;
5761                 __be32 dst4 = tuple->ipv4.daddr;
5762
5763                 if (proto == IPPROTO_TCP)
5764                         sk = __inet_lookup(net, &tcp_hashinfo, NULL, 0,
5765                                            src4, tuple->ipv4.sport,
5766                                            dst4, tuple->ipv4.dport,
5767                                            dif, sdif, &refcounted);
5768                 else
5769                         sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport,
5770                                                dst4, tuple->ipv4.dport,
5771                                                dif, sdif, &udp_table, NULL);
5772 #if IS_ENABLED(CONFIG_IPV6)
5773         } else {
5774                 struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr;
5775                 struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr;
5776
5777                 if (proto == IPPROTO_TCP)
5778                         sk = __inet6_lookup(net, &tcp_hashinfo, NULL, 0,
5779                                             src6, tuple->ipv6.sport,
5780                                             dst6, ntohs(tuple->ipv6.dport),
5781                                             dif, sdif, &refcounted);
5782                 else if (likely(ipv6_bpf_stub))
5783                         sk = ipv6_bpf_stub->udp6_lib_lookup(net,
5784                                                             src6, tuple->ipv6.sport,
5785                                                             dst6, tuple->ipv6.dport,
5786                                                             dif, sdif,
5787                                                             &udp_table, NULL);
5788 #endif
5789         }
5790
5791         if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) {
5792                 WARN_ONCE(1, "Found non-RCU, unreferenced socket!");
5793                 sk = NULL;
5794         }
5795         return sk;
5796 }
5797
5798 /* bpf_skc_lookup performs the core lookup for different types of sockets,
5799  * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE.
5800  * Returns the socket as an 'unsigned long' to simplify the casting in the
5801  * callers to satisfy BPF_CALL declarations.
5802  */
5803 static struct sock *
5804 __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
5805                  struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id,
5806                  u64 flags)
5807 {
5808         struct sock *sk = NULL;
5809         u8 family = AF_UNSPEC;
5810         struct net *net;
5811         int sdif;
5812
5813         if (len == sizeof(tuple->ipv4))
5814                 family = AF_INET;
5815         else if (len == sizeof(tuple->ipv6))
5816                 family = AF_INET6;
5817         else
5818                 return NULL;
5819
5820         if (unlikely(family == AF_UNSPEC || flags ||
5821                      !((s32)netns_id < 0 || netns_id <= S32_MAX)))
5822                 goto out;
5823
5824         if (family == AF_INET)
5825                 sdif = inet_sdif(skb);
5826         else
5827                 sdif = inet6_sdif(skb);
5828
5829         if ((s32)netns_id < 0) {
5830                 net = caller_net;
5831                 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto);
5832         } else {
5833                 net = get_net_ns_by_id(caller_net, netns_id);
5834                 if (unlikely(!net))
5835                         goto out;
5836                 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto);
5837                 put_net(net);
5838         }
5839
5840 out:
5841         return sk;
5842 }
5843
5844 static struct sock *
5845 __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
5846                 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id,
5847                 u64 flags)
5848 {
5849         struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net,
5850                                            ifindex, proto, netns_id, flags);
5851
5852         if (sk) {
5853                 sk = sk_to_full_sk(sk);
5854                 if (!sk_fullsock(sk)) {
5855                         sock_gen_put(sk);
5856                         return NULL;
5857                 }
5858         }
5859
5860         return sk;
5861 }
5862
5863 static struct sock *
5864 bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
5865                u8 proto, u64 netns_id, u64 flags)
5866 {
5867         struct net *caller_net;
5868         int ifindex;
5869
5870         if (skb->dev) {
5871                 caller_net = dev_net(skb->dev);
5872                 ifindex = skb->dev->ifindex;
5873         } else {
5874                 caller_net = sock_net(skb->sk);
5875                 ifindex = 0;
5876         }
5877
5878         return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto,
5879                                 netns_id, flags);
5880 }
5881
5882 static struct sock *
5883 bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
5884               u8 proto, u64 netns_id, u64 flags)
5885 {
5886         struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id,
5887                                          flags);
5888
5889         if (sk) {
5890                 sk = sk_to_full_sk(sk);
5891                 if (!sk_fullsock(sk)) {
5892                         sock_gen_put(sk);
5893                         return NULL;
5894                 }
5895         }
5896
5897         return sk;
5898 }
5899
5900 BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb,
5901            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
5902 {
5903         return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP,
5904                                              netns_id, flags);
5905 }
5906
5907 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = {
5908         .func           = bpf_skc_lookup_tcp,
5909         .gpl_only       = false,
5910         .pkt_access     = true,
5911         .ret_type       = RET_PTR_TO_SOCK_COMMON_OR_NULL,
5912         .arg1_type      = ARG_PTR_TO_CTX,
5913         .arg2_type      = ARG_PTR_TO_MEM,
5914         .arg3_type      = ARG_CONST_SIZE,
5915         .arg4_type      = ARG_ANYTHING,
5916         .arg5_type      = ARG_ANYTHING,
5917 };
5918
5919 BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb,
5920            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
5921 {
5922         return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP,
5923                                             netns_id, flags);
5924 }
5925
5926 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = {
5927         .func           = bpf_sk_lookup_tcp,
5928         .gpl_only       = false,
5929         .pkt_access     = true,
5930         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
5931         .arg1_type      = ARG_PTR_TO_CTX,
5932         .arg2_type      = ARG_PTR_TO_MEM,
5933         .arg3_type      = ARG_CONST_SIZE,
5934         .arg4_type      = ARG_ANYTHING,
5935         .arg5_type      = ARG_ANYTHING,
5936 };
5937
5938 BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb,
5939            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
5940 {
5941         return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP,
5942                                             netns_id, flags);
5943 }
5944
5945 static const struct bpf_func_proto bpf_sk_lookup_udp_proto = {
5946         .func           = bpf_sk_lookup_udp,
5947         .gpl_only       = false,
5948         .pkt_access     = true,
5949         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
5950         .arg1_type      = ARG_PTR_TO_CTX,
5951         .arg2_type      = ARG_PTR_TO_MEM,
5952         .arg3_type      = ARG_CONST_SIZE,
5953         .arg4_type      = ARG_ANYTHING,
5954         .arg5_type      = ARG_ANYTHING,
5955 };
5956
5957 BPF_CALL_1(bpf_sk_release, struct sock *, sk)
5958 {
5959         if (sk && sk_is_refcounted(sk))
5960                 sock_gen_put(sk);
5961         return 0;
5962 }
5963
5964 static const struct bpf_func_proto bpf_sk_release_proto = {
5965         .func           = bpf_sk_release,
5966         .gpl_only       = false,
5967         .ret_type       = RET_INTEGER,
5968         .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
5969 };
5970
5971 BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx,
5972            struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
5973 {
5974         struct net *caller_net = dev_net(ctx->rxq->dev);
5975         int ifindex = ctx->rxq->dev->ifindex;
5976
5977         return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net,
5978                                               ifindex, IPPROTO_UDP, netns_id,
5979                                               flags);
5980 }
5981
5982 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = {
5983         .func           = bpf_xdp_sk_lookup_udp,
5984         .gpl_only       = false,
5985         .pkt_access     = true,
5986         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
5987         .arg1_type      = ARG_PTR_TO_CTX,
5988         .arg2_type      = ARG_PTR_TO_MEM,
5989         .arg3_type      = ARG_CONST_SIZE,
5990         .arg4_type      = ARG_ANYTHING,
5991         .arg5_type      = ARG_ANYTHING,
5992 };
5993
5994 BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx,
5995            struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
5996 {
5997         struct net *caller_net = dev_net(ctx->rxq->dev);
5998         int ifindex = ctx->rxq->dev->ifindex;
5999
6000         return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net,
6001                                                ifindex, IPPROTO_TCP, netns_id,
6002                                                flags);
6003 }
6004
6005 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = {
6006         .func           = bpf_xdp_skc_lookup_tcp,
6007         .gpl_only       = false,
6008         .pkt_access     = true,
6009         .ret_type       = RET_PTR_TO_SOCK_COMMON_OR_NULL,
6010         .arg1_type      = ARG_PTR_TO_CTX,
6011         .arg2_type      = ARG_PTR_TO_MEM,
6012         .arg3_type      = ARG_CONST_SIZE,
6013         .arg4_type      = ARG_ANYTHING,
6014         .arg5_type      = ARG_ANYTHING,
6015 };
6016
6017 BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx,
6018            struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
6019 {
6020         struct net *caller_net = dev_net(ctx->rxq->dev);
6021         int ifindex = ctx->rxq->dev->ifindex;
6022
6023         return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net,
6024                                               ifindex, IPPROTO_TCP, netns_id,
6025                                               flags);
6026 }
6027
6028 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = {
6029         .func           = bpf_xdp_sk_lookup_tcp,
6030         .gpl_only       = false,
6031         .pkt_access     = true,
6032         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
6033         .arg1_type      = ARG_PTR_TO_CTX,
6034         .arg2_type      = ARG_PTR_TO_MEM,
6035         .arg3_type      = ARG_CONST_SIZE,
6036         .arg4_type      = ARG_ANYTHING,
6037         .arg5_type      = ARG_ANYTHING,
6038 };
6039
6040 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx,
6041            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6042 {
6043         return (unsigned long)__bpf_skc_lookup(NULL, tuple, len,
6044                                                sock_net(ctx->sk), 0,
6045                                                IPPROTO_TCP, netns_id, flags);
6046 }
6047
6048 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = {
6049         .func           = bpf_sock_addr_skc_lookup_tcp,
6050         .gpl_only       = false,
6051         .ret_type       = RET_PTR_TO_SOCK_COMMON_OR_NULL,
6052         .arg1_type      = ARG_PTR_TO_CTX,
6053         .arg2_type      = ARG_PTR_TO_MEM,
6054         .arg3_type      = ARG_CONST_SIZE,
6055         .arg4_type      = ARG_ANYTHING,
6056         .arg5_type      = ARG_ANYTHING,
6057 };
6058
6059 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx,
6060            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6061 {
6062         return (unsigned long)__bpf_sk_lookup(NULL, tuple, len,
6063                                               sock_net(ctx->sk), 0, IPPROTO_TCP,
6064                                               netns_id, flags);
6065 }
6066
6067 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = {
6068         .func           = bpf_sock_addr_sk_lookup_tcp,
6069         .gpl_only       = false,
6070         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
6071         .arg1_type      = ARG_PTR_TO_CTX,
6072         .arg2_type      = ARG_PTR_TO_MEM,
6073         .arg3_type      = ARG_CONST_SIZE,
6074         .arg4_type      = ARG_ANYTHING,
6075         .arg5_type      = ARG_ANYTHING,
6076 };
6077
6078 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx,
6079            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6080 {
6081         return (unsigned long)__bpf_sk_lookup(NULL, tuple, len,
6082                                               sock_net(ctx->sk), 0, IPPROTO_UDP,
6083                                               netns_id, flags);
6084 }
6085
6086 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = {
6087         .func           = bpf_sock_addr_sk_lookup_udp,
6088         .gpl_only       = false,
6089         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
6090         .arg1_type      = ARG_PTR_TO_CTX,
6091         .arg2_type      = ARG_PTR_TO_MEM,
6092         .arg3_type      = ARG_CONST_SIZE,
6093         .arg4_type      = ARG_ANYTHING,
6094         .arg5_type      = ARG_ANYTHING,
6095 };
6096
6097 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
6098                                   struct bpf_insn_access_aux *info)
6099 {
6100         if (off < 0 || off >= offsetofend(struct bpf_tcp_sock,
6101                                           icsk_retransmits))
6102                 return false;
6103
6104         if (off % size != 0)
6105                 return false;
6106
6107         switch (off) {
6108         case offsetof(struct bpf_tcp_sock, bytes_received):
6109         case offsetof(struct bpf_tcp_sock, bytes_acked):
6110                 return size == sizeof(__u64);
6111         default:
6112                 return size == sizeof(__u32);
6113         }
6114 }
6115
6116 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
6117                                     const struct bpf_insn *si,
6118                                     struct bpf_insn *insn_buf,
6119                                     struct bpf_prog *prog, u32 *target_size)
6120 {
6121         struct bpf_insn *insn = insn_buf;
6122
6123 #define BPF_TCP_SOCK_GET_COMMON(FIELD)                                  \
6124         do {                                                            \
6125                 BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) >     \
6126                              sizeof_field(struct bpf_tcp_sock, FIELD)); \
6127                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\
6128                                       si->dst_reg, si->src_reg,         \
6129                                       offsetof(struct tcp_sock, FIELD)); \
6130         } while (0)
6131
6132 #define BPF_INET_SOCK_GET_COMMON(FIELD)                                 \
6133         do {                                                            \
6134                 BUILD_BUG_ON(sizeof_field(struct inet_connection_sock,  \
6135                                           FIELD) >                      \
6136                              sizeof_field(struct bpf_tcp_sock, FIELD)); \
6137                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                 \
6138                                         struct inet_connection_sock,    \
6139                                         FIELD),                         \
6140                                       si->dst_reg, si->src_reg,         \
6141                                       offsetof(                         \
6142                                         struct inet_connection_sock,    \
6143                                         FIELD));                        \
6144         } while (0)
6145
6146         if (insn > insn_buf)
6147                 return insn - insn_buf;
6148
6149         switch (si->off) {
6150         case offsetof(struct bpf_tcp_sock, rtt_min):
6151                 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) !=
6152                              sizeof(struct minmax));
6153                 BUILD_BUG_ON(sizeof(struct minmax) <
6154                              sizeof(struct minmax_sample));
6155
6156                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
6157                                       offsetof(struct tcp_sock, rtt_min) +
6158                                       offsetof(struct minmax_sample, v));
6159                 break;
6160         case offsetof(struct bpf_tcp_sock, snd_cwnd):
6161                 BPF_TCP_SOCK_GET_COMMON(snd_cwnd);
6162                 break;
6163         case offsetof(struct bpf_tcp_sock, srtt_us):
6164                 BPF_TCP_SOCK_GET_COMMON(srtt_us);
6165                 break;
6166         case offsetof(struct bpf_tcp_sock, snd_ssthresh):
6167                 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh);
6168                 break;
6169         case offsetof(struct bpf_tcp_sock, rcv_nxt):
6170                 BPF_TCP_SOCK_GET_COMMON(rcv_nxt);
6171                 break;
6172         case offsetof(struct bpf_tcp_sock, snd_nxt):
6173                 BPF_TCP_SOCK_GET_COMMON(snd_nxt);
6174                 break;
6175         case offsetof(struct bpf_tcp_sock, snd_una):
6176                 BPF_TCP_SOCK_GET_COMMON(snd_una);
6177                 break;
6178         case offsetof(struct bpf_tcp_sock, mss_cache):
6179                 BPF_TCP_SOCK_GET_COMMON(mss_cache);
6180                 break;
6181         case offsetof(struct bpf_tcp_sock, ecn_flags):
6182                 BPF_TCP_SOCK_GET_COMMON(ecn_flags);
6183                 break;
6184         case offsetof(struct bpf_tcp_sock, rate_delivered):
6185                 BPF_TCP_SOCK_GET_COMMON(rate_delivered);
6186                 break;
6187         case offsetof(struct bpf_tcp_sock, rate_interval_us):
6188                 BPF_TCP_SOCK_GET_COMMON(rate_interval_us);
6189                 break;
6190         case offsetof(struct bpf_tcp_sock, packets_out):
6191                 BPF_TCP_SOCK_GET_COMMON(packets_out);
6192                 break;
6193         case offsetof(struct bpf_tcp_sock, retrans_out):
6194                 BPF_TCP_SOCK_GET_COMMON(retrans_out);
6195                 break;
6196         case offsetof(struct bpf_tcp_sock, total_retrans):
6197                 BPF_TCP_SOCK_GET_COMMON(total_retrans);
6198                 break;
6199         case offsetof(struct bpf_tcp_sock, segs_in):
6200                 BPF_TCP_SOCK_GET_COMMON(segs_in);
6201                 break;
6202         case offsetof(struct bpf_tcp_sock, data_segs_in):
6203                 BPF_TCP_SOCK_GET_COMMON(data_segs_in);
6204                 break;
6205         case offsetof(struct bpf_tcp_sock, segs_out):
6206                 BPF_TCP_SOCK_GET_COMMON(segs_out);
6207                 break;
6208         case offsetof(struct bpf_tcp_sock, data_segs_out):
6209                 BPF_TCP_SOCK_GET_COMMON(data_segs_out);
6210                 break;
6211         case offsetof(struct bpf_tcp_sock, lost_out):
6212                 BPF_TCP_SOCK_GET_COMMON(lost_out);
6213                 break;
6214         case offsetof(struct bpf_tcp_sock, sacked_out):
6215                 BPF_TCP_SOCK_GET_COMMON(sacked_out);
6216                 break;
6217         case offsetof(struct bpf_tcp_sock, bytes_received):
6218                 BPF_TCP_SOCK_GET_COMMON(bytes_received);
6219                 break;
6220         case offsetof(struct bpf_tcp_sock, bytes_acked):
6221                 BPF_TCP_SOCK_GET_COMMON(bytes_acked);
6222                 break;
6223         case offsetof(struct bpf_tcp_sock, dsack_dups):
6224                 BPF_TCP_SOCK_GET_COMMON(dsack_dups);
6225                 break;
6226         case offsetof(struct bpf_tcp_sock, delivered):
6227                 BPF_TCP_SOCK_GET_COMMON(delivered);
6228                 break;
6229         case offsetof(struct bpf_tcp_sock, delivered_ce):
6230                 BPF_TCP_SOCK_GET_COMMON(delivered_ce);
6231                 break;
6232         case offsetof(struct bpf_tcp_sock, icsk_retransmits):
6233                 BPF_INET_SOCK_GET_COMMON(icsk_retransmits);
6234                 break;
6235         }
6236
6237         return insn - insn_buf;
6238 }
6239
6240 BPF_CALL_1(bpf_tcp_sock, struct sock *, sk)
6241 {
6242         if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP)
6243                 return (unsigned long)sk;
6244
6245         return (unsigned long)NULL;
6246 }
6247
6248 const struct bpf_func_proto bpf_tcp_sock_proto = {
6249         .func           = bpf_tcp_sock,
6250         .gpl_only       = false,
6251         .ret_type       = RET_PTR_TO_TCP_SOCK_OR_NULL,
6252         .arg1_type      = ARG_PTR_TO_SOCK_COMMON,
6253 };
6254
6255 BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk)
6256 {
6257         sk = sk_to_full_sk(sk);
6258
6259         if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE))
6260                 return (unsigned long)sk;
6261
6262         return (unsigned long)NULL;
6263 }
6264
6265 static const struct bpf_func_proto bpf_get_listener_sock_proto = {
6266         .func           = bpf_get_listener_sock,
6267         .gpl_only       = false,
6268         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
6269         .arg1_type      = ARG_PTR_TO_SOCK_COMMON,
6270 };
6271
6272 BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb)
6273 {
6274         unsigned int iphdr_len;
6275
6276         switch (skb_protocol(skb, true)) {
6277         case cpu_to_be16(ETH_P_IP):
6278                 iphdr_len = sizeof(struct iphdr);
6279                 break;
6280         case cpu_to_be16(ETH_P_IPV6):
6281                 iphdr_len = sizeof(struct ipv6hdr);
6282                 break;
6283         default:
6284                 return 0;
6285         }
6286
6287         if (skb_headlen(skb) < iphdr_len)
6288                 return 0;
6289
6290         if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len))
6291                 return 0;
6292
6293         return INET_ECN_set_ce(skb);
6294 }
6295
6296 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
6297                                   struct bpf_insn_access_aux *info)
6298 {
6299         if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id))
6300                 return false;
6301
6302         if (off % size != 0)
6303                 return false;
6304
6305         switch (off) {
6306         default:
6307                 return size == sizeof(__u32);
6308         }
6309 }
6310
6311 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
6312                                     const struct bpf_insn *si,
6313                                     struct bpf_insn *insn_buf,
6314                                     struct bpf_prog *prog, u32 *target_size)
6315 {
6316         struct bpf_insn *insn = insn_buf;
6317
6318 #define BPF_XDP_SOCK_GET(FIELD)                                         \
6319         do {                                                            \
6320                 BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) >     \
6321                              sizeof_field(struct bpf_xdp_sock, FIELD)); \
6322                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\
6323                                       si->dst_reg, si->src_reg,         \
6324                                       offsetof(struct xdp_sock, FIELD)); \
6325         } while (0)
6326
6327         switch (si->off) {
6328         case offsetof(struct bpf_xdp_sock, queue_id):
6329                 BPF_XDP_SOCK_GET(queue_id);
6330                 break;
6331         }
6332
6333         return insn - insn_buf;
6334 }
6335
6336 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = {
6337         .func           = bpf_skb_ecn_set_ce,
6338         .gpl_only       = false,
6339         .ret_type       = RET_INTEGER,
6340         .arg1_type      = ARG_PTR_TO_CTX,
6341 };
6342
6343 BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len,
6344            struct tcphdr *, th, u32, th_len)
6345 {
6346 #ifdef CONFIG_SYN_COOKIES
6347         u32 cookie;
6348         int ret;
6349
6350         if (unlikely(!sk || th_len < sizeof(*th)))
6351                 return -EINVAL;
6352
6353         /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */
6354         if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN)
6355                 return -EINVAL;
6356
6357         if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies)
6358                 return -EINVAL;
6359
6360         if (!th->ack || th->rst || th->syn)
6361                 return -ENOENT;
6362
6363         if (tcp_synq_no_recent_overflow(sk))
6364                 return -ENOENT;
6365
6366         cookie = ntohl(th->ack_seq) - 1;
6367
6368         switch (sk->sk_family) {
6369         case AF_INET:
6370                 if (unlikely(iph_len < sizeof(struct iphdr)))
6371                         return -EINVAL;
6372
6373                 ret = __cookie_v4_check((struct iphdr *)iph, th, cookie);
6374                 break;
6375
6376 #if IS_BUILTIN(CONFIG_IPV6)
6377         case AF_INET6:
6378                 if (unlikely(iph_len < sizeof(struct ipv6hdr)))
6379                         return -EINVAL;
6380
6381                 ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie);
6382                 break;
6383 #endif /* CONFIG_IPV6 */
6384
6385         default:
6386                 return -EPROTONOSUPPORT;
6387         }
6388
6389         if (ret > 0)
6390                 return 0;
6391
6392         return -ENOENT;
6393 #else
6394         return -ENOTSUPP;
6395 #endif
6396 }
6397
6398 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = {
6399         .func           = bpf_tcp_check_syncookie,
6400         .gpl_only       = true,
6401         .pkt_access     = true,
6402         .ret_type       = RET_INTEGER,
6403         .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
6404         .arg2_type      = ARG_PTR_TO_MEM,
6405         .arg3_type      = ARG_CONST_SIZE,
6406         .arg4_type      = ARG_PTR_TO_MEM,
6407         .arg5_type      = ARG_CONST_SIZE,
6408 };
6409
6410 BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len,
6411            struct tcphdr *, th, u32, th_len)
6412 {
6413 #ifdef CONFIG_SYN_COOKIES
6414         u32 cookie;
6415         u16 mss;
6416
6417         if (unlikely(!sk || th_len < sizeof(*th) || th_len != th->doff * 4))
6418                 return -EINVAL;
6419
6420         if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN)
6421                 return -EINVAL;
6422
6423         if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies)
6424                 return -ENOENT;
6425
6426         if (!th->syn || th->ack || th->fin || th->rst)
6427                 return -EINVAL;
6428
6429         if (unlikely(iph_len < sizeof(struct iphdr)))
6430                 return -EINVAL;
6431
6432         /* Both struct iphdr and struct ipv6hdr have the version field at the
6433          * same offset so we can cast to the shorter header (struct iphdr).
6434          */
6435         switch (((struct iphdr *)iph)->version) {
6436         case 4:
6437                 if (sk->sk_family == AF_INET6 && sk->sk_ipv6only)
6438                         return -EINVAL;
6439
6440                 mss = tcp_v4_get_syncookie(sk, iph, th, &cookie);
6441                 break;
6442
6443 #if IS_BUILTIN(CONFIG_IPV6)
6444         case 6:
6445                 if (unlikely(iph_len < sizeof(struct ipv6hdr)))
6446                         return -EINVAL;
6447
6448                 if (sk->sk_family != AF_INET6)
6449                         return -EINVAL;
6450
6451                 mss = tcp_v6_get_syncookie(sk, iph, th, &cookie);
6452                 break;
6453 #endif /* CONFIG_IPV6 */
6454
6455         default:
6456                 return -EPROTONOSUPPORT;
6457         }
6458         if (mss == 0)
6459                 return -ENOENT;
6460
6461         return cookie | ((u64)mss << 32);
6462 #else
6463         return -EOPNOTSUPP;
6464 #endif /* CONFIG_SYN_COOKIES */
6465 }
6466
6467 static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = {
6468         .func           = bpf_tcp_gen_syncookie,
6469         .gpl_only       = true, /* __cookie_v*_init_sequence() is GPL */
6470         .pkt_access     = true,
6471         .ret_type       = RET_INTEGER,
6472         .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
6473         .arg2_type      = ARG_PTR_TO_MEM,
6474         .arg3_type      = ARG_CONST_SIZE,
6475         .arg4_type      = ARG_PTR_TO_MEM,
6476         .arg5_type      = ARG_CONST_SIZE,
6477 };
6478
6479 BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags)
6480 {
6481         if (!sk || flags != 0)
6482                 return -EINVAL;
6483         if (!skb_at_tc_ingress(skb))
6484                 return -EOPNOTSUPP;
6485         if (unlikely(dev_net(skb->dev) != sock_net(sk)))
6486                 return -ENETUNREACH;
6487         if (unlikely(sk_fullsock(sk) && sk->sk_reuseport))
6488                 return -ESOCKTNOSUPPORT;
6489         if (sk_is_refcounted(sk) &&
6490             unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
6491                 return -ENOENT;
6492
6493         skb_orphan(skb);
6494         skb->sk = sk;
6495         skb->destructor = sock_pfree;
6496
6497         return 0;
6498 }
6499
6500 static const struct bpf_func_proto bpf_sk_assign_proto = {
6501         .func           = bpf_sk_assign,
6502         .gpl_only       = false,
6503         .ret_type       = RET_INTEGER,
6504         .arg1_type      = ARG_PTR_TO_CTX,
6505         .arg2_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
6506         .arg3_type      = ARG_ANYTHING,
6507 };
6508
6509 static const u8 *bpf_search_tcp_opt(const u8 *op, const u8 *opend,
6510                                     u8 search_kind, const u8 *magic,
6511                                     u8 magic_len, bool *eol)
6512 {
6513         u8 kind, kind_len;
6514
6515         *eol = false;
6516
6517         while (op < opend) {
6518                 kind = op[0];
6519
6520                 if (kind == TCPOPT_EOL) {
6521                         *eol = true;
6522                         return ERR_PTR(-ENOMSG);
6523                 } else if (kind == TCPOPT_NOP) {
6524                         op++;
6525                         continue;
6526                 }
6527
6528                 if (opend - op < 2 || opend - op < op[1] || op[1] < 2)
6529                         /* Something is wrong in the received header.
6530                          * Follow the TCP stack's tcp_parse_options()
6531                          * and just bail here.
6532                          */
6533                         return ERR_PTR(-EFAULT);
6534
6535                 kind_len = op[1];
6536                 if (search_kind == kind) {
6537                         if (!magic_len)
6538                                 return op;
6539
6540                         if (magic_len > kind_len - 2)
6541                                 return ERR_PTR(-ENOMSG);
6542
6543                         if (!memcmp(&op[2], magic, magic_len))
6544                                 return op;
6545                 }
6546
6547                 op += kind_len;
6548         }
6549
6550         return ERR_PTR(-ENOMSG);
6551 }
6552
6553 BPF_CALL_4(bpf_sock_ops_load_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock,
6554            void *, search_res, u32, len, u64, flags)
6555 {
6556         bool eol, load_syn = flags & BPF_LOAD_HDR_OPT_TCP_SYN;
6557         const u8 *op, *opend, *magic, *search = search_res;
6558         u8 search_kind, search_len, copy_len, magic_len;
6559         int ret;
6560
6561         /* 2 byte is the minimal option len except TCPOPT_NOP and
6562          * TCPOPT_EOL which are useless for the bpf prog to learn
6563          * and this helper disallow loading them also.
6564          */
6565         if (len < 2 || flags & ~BPF_LOAD_HDR_OPT_TCP_SYN)
6566                 return -EINVAL;
6567
6568         search_kind = search[0];
6569         search_len = search[1];
6570
6571         if (search_len > len || search_kind == TCPOPT_NOP ||
6572             search_kind == TCPOPT_EOL)
6573                 return -EINVAL;
6574
6575         if (search_kind == TCPOPT_EXP || search_kind == 253) {
6576                 /* 16 or 32 bit magic.  +2 for kind and kind length */
6577                 if (search_len != 4 && search_len != 6)
6578                         return -EINVAL;
6579                 magic = &search[2];
6580                 magic_len = search_len - 2;
6581         } else {
6582                 if (search_len)
6583                         return -EINVAL;
6584                 magic = NULL;
6585                 magic_len = 0;
6586         }
6587
6588         if (load_syn) {
6589                 ret = bpf_sock_ops_get_syn(bpf_sock, TCP_BPF_SYN, &op);
6590                 if (ret < 0)
6591                         return ret;
6592
6593                 opend = op + ret;
6594                 op += sizeof(struct tcphdr);
6595         } else {
6596                 if (!bpf_sock->skb ||
6597                     bpf_sock->op == BPF_SOCK_OPS_HDR_OPT_LEN_CB)
6598                         /* This bpf_sock->op cannot call this helper */
6599                         return -EPERM;
6600
6601                 opend = bpf_sock->skb_data_end;
6602                 op = bpf_sock->skb->data + sizeof(struct tcphdr);
6603         }
6604
6605         op = bpf_search_tcp_opt(op, opend, search_kind, magic, magic_len,
6606                                 &eol);
6607         if (IS_ERR(op))
6608                 return PTR_ERR(op);
6609
6610         copy_len = op[1];
6611         ret = copy_len;
6612         if (copy_len > len) {
6613                 ret = -ENOSPC;
6614                 copy_len = len;
6615         }
6616
6617         memcpy(search_res, op, copy_len);
6618         return ret;
6619 }
6620
6621 static const struct bpf_func_proto bpf_sock_ops_load_hdr_opt_proto = {
6622         .func           = bpf_sock_ops_load_hdr_opt,
6623         .gpl_only       = false,
6624         .ret_type       = RET_INTEGER,
6625         .arg1_type      = ARG_PTR_TO_CTX,
6626         .arg2_type      = ARG_PTR_TO_MEM,
6627         .arg3_type      = ARG_CONST_SIZE,
6628         .arg4_type      = ARG_ANYTHING,
6629 };
6630
6631 BPF_CALL_4(bpf_sock_ops_store_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock,
6632            const void *, from, u32, len, u64, flags)
6633 {
6634         u8 new_kind, new_kind_len, magic_len = 0, *opend;
6635         const u8 *op, *new_op, *magic = NULL;
6636         struct sk_buff *skb;
6637         bool eol;
6638
6639         if (bpf_sock->op != BPF_SOCK_OPS_WRITE_HDR_OPT_CB)
6640                 return -EPERM;
6641
6642         if (len < 2 || flags)
6643                 return -EINVAL;
6644
6645         new_op = from;
6646         new_kind = new_op[0];
6647         new_kind_len = new_op[1];
6648
6649         if (new_kind_len > len || new_kind == TCPOPT_NOP ||
6650             new_kind == TCPOPT_EOL)
6651                 return -EINVAL;
6652
6653         if (new_kind_len > bpf_sock->remaining_opt_len)
6654                 return -ENOSPC;
6655
6656         /* 253 is another experimental kind */
6657         if (new_kind == TCPOPT_EXP || new_kind == 253)  {
6658                 if (new_kind_len < 4)
6659                         return -EINVAL;
6660                 /* Match for the 2 byte magic also.
6661                  * RFC 6994: the magic could be 2 or 4 bytes.
6662                  * Hence, matching by 2 byte only is on the
6663                  * conservative side but it is the right
6664                  * thing to do for the 'search-for-duplication'
6665                  * purpose.
6666                  */
6667                 magic = &new_op[2];
6668                 magic_len = 2;
6669         }
6670
6671         /* Check for duplication */
6672         skb = bpf_sock->skb;
6673         op = skb->data + sizeof(struct tcphdr);
6674         opend = bpf_sock->skb_data_end;
6675
6676         op = bpf_search_tcp_opt(op, opend, new_kind, magic, magic_len,
6677                                 &eol);
6678         if (!IS_ERR(op))
6679                 return -EEXIST;
6680
6681         if (PTR_ERR(op) != -ENOMSG)
6682                 return PTR_ERR(op);
6683
6684         if (eol)
6685                 /* The option has been ended.  Treat it as no more
6686                  * header option can be written.
6687                  */
6688                 return -ENOSPC;
6689
6690         /* No duplication found.  Store the header option. */
6691         memcpy(opend, from, new_kind_len);
6692
6693         bpf_sock->remaining_opt_len -= new_kind_len;
6694         bpf_sock->skb_data_end += new_kind_len;
6695
6696         return 0;
6697 }
6698
6699 static const struct bpf_func_proto bpf_sock_ops_store_hdr_opt_proto = {
6700         .func           = bpf_sock_ops_store_hdr_opt,
6701         .gpl_only       = false,
6702         .ret_type       = RET_INTEGER,
6703         .arg1_type      = ARG_PTR_TO_CTX,
6704         .arg2_type      = ARG_PTR_TO_MEM,
6705         .arg3_type      = ARG_CONST_SIZE,
6706         .arg4_type      = ARG_ANYTHING,
6707 };
6708
6709 BPF_CALL_3(bpf_sock_ops_reserve_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock,
6710            u32, len, u64, flags)
6711 {
6712         if (bpf_sock->op != BPF_SOCK_OPS_HDR_OPT_LEN_CB)
6713                 return -EPERM;
6714
6715         if (flags || len < 2)
6716                 return -EINVAL;
6717
6718         if (len > bpf_sock->remaining_opt_len)
6719                 return -ENOSPC;
6720
6721         bpf_sock->remaining_opt_len -= len;
6722
6723         return 0;
6724 }
6725
6726 static const struct bpf_func_proto bpf_sock_ops_reserve_hdr_opt_proto = {
6727         .func           = bpf_sock_ops_reserve_hdr_opt,
6728         .gpl_only       = false,
6729         .ret_type       = RET_INTEGER,
6730         .arg1_type      = ARG_PTR_TO_CTX,
6731         .arg2_type      = ARG_ANYTHING,
6732         .arg3_type      = ARG_ANYTHING,
6733 };
6734
6735 #endif /* CONFIG_INET */
6736
6737 bool bpf_helper_changes_pkt_data(void *func)
6738 {
6739         if (func == bpf_skb_vlan_push ||
6740             func == bpf_skb_vlan_pop ||
6741             func == bpf_skb_store_bytes ||
6742             func == bpf_skb_change_proto ||
6743             func == bpf_skb_change_head ||
6744             func == sk_skb_change_head ||
6745             func == bpf_skb_change_tail ||
6746             func == sk_skb_change_tail ||
6747             func == bpf_skb_adjust_room ||
6748             func == bpf_skb_pull_data ||
6749             func == sk_skb_pull_data ||
6750             func == bpf_clone_redirect ||
6751             func == bpf_l3_csum_replace ||
6752             func == bpf_l4_csum_replace ||
6753             func == bpf_xdp_adjust_head ||
6754             func == bpf_xdp_adjust_meta ||
6755             func == bpf_msg_pull_data ||
6756             func == bpf_msg_push_data ||
6757             func == bpf_msg_pop_data ||
6758             func == bpf_xdp_adjust_tail ||
6759 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
6760             func == bpf_lwt_seg6_store_bytes ||
6761             func == bpf_lwt_seg6_adjust_srh ||
6762             func == bpf_lwt_seg6_action ||
6763 #endif
6764 #ifdef CONFIG_INET
6765             func == bpf_sock_ops_store_hdr_opt ||
6766 #endif
6767             func == bpf_lwt_in_push_encap ||
6768             func == bpf_lwt_xmit_push_encap)
6769                 return true;
6770
6771         return false;
6772 }
6773
6774 const struct bpf_func_proto bpf_event_output_data_proto __weak;
6775 const struct bpf_func_proto bpf_sk_storage_get_cg_sock_proto __weak;
6776
6777 static const struct bpf_func_proto *
6778 sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6779 {
6780         switch (func_id) {
6781         /* inet and inet6 sockets are created in a process
6782          * context so there is always a valid uid/gid
6783          */
6784         case BPF_FUNC_get_current_uid_gid:
6785                 return &bpf_get_current_uid_gid_proto;
6786         case BPF_FUNC_get_local_storage:
6787                 return &bpf_get_local_storage_proto;
6788         case BPF_FUNC_get_socket_cookie:
6789                 return &bpf_get_socket_cookie_sock_proto;
6790         case BPF_FUNC_get_netns_cookie:
6791                 return &bpf_get_netns_cookie_sock_proto;
6792         case BPF_FUNC_perf_event_output:
6793                 return &bpf_event_output_data_proto;
6794         case BPF_FUNC_get_current_pid_tgid:
6795                 return &bpf_get_current_pid_tgid_proto;
6796         case BPF_FUNC_get_current_comm:
6797                 return &bpf_get_current_comm_proto;
6798 #ifdef CONFIG_CGROUPS
6799         case BPF_FUNC_get_current_cgroup_id:
6800                 return &bpf_get_current_cgroup_id_proto;
6801         case BPF_FUNC_get_current_ancestor_cgroup_id:
6802                 return &bpf_get_current_ancestor_cgroup_id_proto;
6803 #endif
6804 #ifdef CONFIG_CGROUP_NET_CLASSID
6805         case BPF_FUNC_get_cgroup_classid:
6806                 return &bpf_get_cgroup_classid_curr_proto;
6807 #endif
6808         case BPF_FUNC_sk_storage_get:
6809                 return &bpf_sk_storage_get_cg_sock_proto;
6810         default:
6811                 return bpf_base_func_proto(func_id);
6812         }
6813 }
6814
6815 static const struct bpf_func_proto *
6816 sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6817 {
6818         switch (func_id) {
6819         /* inet and inet6 sockets are created in a process
6820          * context so there is always a valid uid/gid
6821          */
6822         case BPF_FUNC_get_current_uid_gid:
6823                 return &bpf_get_current_uid_gid_proto;
6824         case BPF_FUNC_bind:
6825                 switch (prog->expected_attach_type) {
6826                 case BPF_CGROUP_INET4_CONNECT:
6827                 case BPF_CGROUP_INET6_CONNECT:
6828                         return &bpf_bind_proto;
6829                 default:
6830                         return NULL;
6831                 }
6832         case BPF_FUNC_get_socket_cookie:
6833                 return &bpf_get_socket_cookie_sock_addr_proto;
6834         case BPF_FUNC_get_netns_cookie:
6835                 return &bpf_get_netns_cookie_sock_addr_proto;
6836         case BPF_FUNC_get_local_storage:
6837                 return &bpf_get_local_storage_proto;
6838         case BPF_FUNC_perf_event_output:
6839                 return &bpf_event_output_data_proto;
6840         case BPF_FUNC_get_current_pid_tgid:
6841                 return &bpf_get_current_pid_tgid_proto;
6842         case BPF_FUNC_get_current_comm:
6843                 return &bpf_get_current_comm_proto;
6844 #ifdef CONFIG_CGROUPS
6845         case BPF_FUNC_get_current_cgroup_id:
6846                 return &bpf_get_current_cgroup_id_proto;
6847         case BPF_FUNC_get_current_ancestor_cgroup_id:
6848                 return &bpf_get_current_ancestor_cgroup_id_proto;
6849 #endif
6850 #ifdef CONFIG_CGROUP_NET_CLASSID
6851         case BPF_FUNC_get_cgroup_classid:
6852                 return &bpf_get_cgroup_classid_curr_proto;
6853 #endif
6854 #ifdef CONFIG_INET
6855         case BPF_FUNC_sk_lookup_tcp:
6856                 return &bpf_sock_addr_sk_lookup_tcp_proto;
6857         case BPF_FUNC_sk_lookup_udp:
6858                 return &bpf_sock_addr_sk_lookup_udp_proto;
6859         case BPF_FUNC_sk_release:
6860                 return &bpf_sk_release_proto;
6861         case BPF_FUNC_skc_lookup_tcp:
6862                 return &bpf_sock_addr_skc_lookup_tcp_proto;
6863 #endif /* CONFIG_INET */
6864         case BPF_FUNC_sk_storage_get:
6865                 return &bpf_sk_storage_get_proto;
6866         case BPF_FUNC_sk_storage_delete:
6867                 return &bpf_sk_storage_delete_proto;
6868         case BPF_FUNC_setsockopt:
6869                 switch (prog->expected_attach_type) {
6870                 case BPF_CGROUP_INET4_CONNECT:
6871                 case BPF_CGROUP_INET6_CONNECT:
6872                         return &bpf_sock_addr_setsockopt_proto;
6873                 default:
6874                         return NULL;
6875                 }
6876         case BPF_FUNC_getsockopt:
6877                 switch (prog->expected_attach_type) {
6878                 case BPF_CGROUP_INET4_CONNECT:
6879                 case BPF_CGROUP_INET6_CONNECT:
6880                         return &bpf_sock_addr_getsockopt_proto;
6881                 default:
6882                         return NULL;
6883                 }
6884         default:
6885                 return bpf_sk_base_func_proto(func_id);
6886         }
6887 }
6888
6889 static const struct bpf_func_proto *
6890 sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6891 {
6892         switch (func_id) {
6893         case BPF_FUNC_skb_load_bytes:
6894                 return &bpf_skb_load_bytes_proto;
6895         case BPF_FUNC_skb_load_bytes_relative:
6896                 return &bpf_skb_load_bytes_relative_proto;
6897         case BPF_FUNC_get_socket_cookie:
6898                 return &bpf_get_socket_cookie_proto;
6899         case BPF_FUNC_get_socket_uid:
6900                 return &bpf_get_socket_uid_proto;
6901         case BPF_FUNC_perf_event_output:
6902                 return &bpf_skb_event_output_proto;
6903         default:
6904                 return bpf_sk_base_func_proto(func_id);
6905         }
6906 }
6907
6908 const struct bpf_func_proto bpf_sk_storage_get_proto __weak;
6909 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak;
6910
6911 static const struct bpf_func_proto *
6912 cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6913 {
6914         switch (func_id) {
6915         case BPF_FUNC_get_local_storage:
6916                 return &bpf_get_local_storage_proto;
6917         case BPF_FUNC_sk_fullsock:
6918                 return &bpf_sk_fullsock_proto;
6919         case BPF_FUNC_sk_storage_get:
6920                 return &bpf_sk_storage_get_proto;
6921         case BPF_FUNC_sk_storage_delete:
6922                 return &bpf_sk_storage_delete_proto;
6923         case BPF_FUNC_perf_event_output:
6924                 return &bpf_skb_event_output_proto;
6925 #ifdef CONFIG_SOCK_CGROUP_DATA
6926         case BPF_FUNC_skb_cgroup_id:
6927                 return &bpf_skb_cgroup_id_proto;
6928         case BPF_FUNC_skb_ancestor_cgroup_id:
6929                 return &bpf_skb_ancestor_cgroup_id_proto;
6930         case BPF_FUNC_sk_cgroup_id:
6931                 return &bpf_sk_cgroup_id_proto;
6932         case BPF_FUNC_sk_ancestor_cgroup_id:
6933                 return &bpf_sk_ancestor_cgroup_id_proto;
6934 #endif
6935 #ifdef CONFIG_INET
6936         case BPF_FUNC_sk_lookup_tcp:
6937                 return &bpf_sk_lookup_tcp_proto;
6938         case BPF_FUNC_sk_lookup_udp:
6939                 return &bpf_sk_lookup_udp_proto;
6940         case BPF_FUNC_sk_release:
6941                 return &bpf_sk_release_proto;
6942         case BPF_FUNC_skc_lookup_tcp:
6943                 return &bpf_skc_lookup_tcp_proto;
6944         case BPF_FUNC_tcp_sock:
6945                 return &bpf_tcp_sock_proto;
6946         case BPF_FUNC_get_listener_sock:
6947                 return &bpf_get_listener_sock_proto;
6948         case BPF_FUNC_skb_ecn_set_ce:
6949                 return &bpf_skb_ecn_set_ce_proto;
6950 #endif
6951         default:
6952                 return sk_filter_func_proto(func_id, prog);
6953         }
6954 }
6955
6956 static const struct bpf_func_proto *
6957 tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6958 {
6959         switch (func_id) {
6960         case BPF_FUNC_skb_store_bytes:
6961                 return &bpf_skb_store_bytes_proto;
6962         case BPF_FUNC_skb_load_bytes:
6963                 return &bpf_skb_load_bytes_proto;
6964         case BPF_FUNC_skb_load_bytes_relative:
6965                 return &bpf_skb_load_bytes_relative_proto;
6966         case BPF_FUNC_skb_pull_data:
6967                 return &bpf_skb_pull_data_proto;
6968         case BPF_FUNC_csum_diff:
6969                 return &bpf_csum_diff_proto;
6970         case BPF_FUNC_csum_update:
6971                 return &bpf_csum_update_proto;
6972         case BPF_FUNC_csum_level:
6973                 return &bpf_csum_level_proto;
6974         case BPF_FUNC_l3_csum_replace:
6975                 return &bpf_l3_csum_replace_proto;
6976         case BPF_FUNC_l4_csum_replace:
6977                 return &bpf_l4_csum_replace_proto;
6978         case BPF_FUNC_clone_redirect:
6979                 return &bpf_clone_redirect_proto;
6980         case BPF_FUNC_get_cgroup_classid:
6981                 return &bpf_get_cgroup_classid_proto;
6982         case BPF_FUNC_skb_vlan_push:
6983                 return &bpf_skb_vlan_push_proto;
6984         case BPF_FUNC_skb_vlan_pop:
6985                 return &bpf_skb_vlan_pop_proto;
6986         case BPF_FUNC_skb_change_proto:
6987                 return &bpf_skb_change_proto_proto;
6988         case BPF_FUNC_skb_change_type:
6989                 return &bpf_skb_change_type_proto;
6990         case BPF_FUNC_skb_adjust_room:
6991                 return &bpf_skb_adjust_room_proto;
6992         case BPF_FUNC_skb_change_tail:
6993                 return &bpf_skb_change_tail_proto;
6994         case BPF_FUNC_skb_change_head:
6995                 return &bpf_skb_change_head_proto;
6996         case BPF_FUNC_skb_get_tunnel_key:
6997                 return &bpf_skb_get_tunnel_key_proto;
6998         case BPF_FUNC_skb_set_tunnel_key:
6999                 return bpf_get_skb_set_tunnel_proto(func_id);
7000         case BPF_FUNC_skb_get_tunnel_opt:
7001                 return &bpf_skb_get_tunnel_opt_proto;
7002         case BPF_FUNC_skb_set_tunnel_opt:
7003                 return bpf_get_skb_set_tunnel_proto(func_id);
7004         case BPF_FUNC_redirect:
7005                 return &bpf_redirect_proto;
7006         case BPF_FUNC_redirect_neigh:
7007                 return &bpf_redirect_neigh_proto;
7008         case BPF_FUNC_get_route_realm:
7009                 return &bpf_get_route_realm_proto;
7010         case BPF_FUNC_get_hash_recalc:
7011                 return &bpf_get_hash_recalc_proto;
7012         case BPF_FUNC_set_hash_invalid:
7013                 return &bpf_set_hash_invalid_proto;
7014         case BPF_FUNC_set_hash:
7015                 return &bpf_set_hash_proto;
7016         case BPF_FUNC_perf_event_output:
7017                 return &bpf_skb_event_output_proto;
7018         case BPF_FUNC_get_smp_processor_id:
7019                 return &bpf_get_smp_processor_id_proto;
7020         case BPF_FUNC_skb_under_cgroup:
7021                 return &bpf_skb_under_cgroup_proto;
7022         case BPF_FUNC_get_socket_cookie:
7023                 return &bpf_get_socket_cookie_proto;
7024         case BPF_FUNC_get_socket_uid:
7025                 return &bpf_get_socket_uid_proto;
7026         case BPF_FUNC_fib_lookup:
7027                 return &bpf_skb_fib_lookup_proto;
7028         case BPF_FUNC_sk_fullsock:
7029                 return &bpf_sk_fullsock_proto;
7030         case BPF_FUNC_sk_storage_get:
7031                 return &bpf_sk_storage_get_proto;
7032         case BPF_FUNC_sk_storage_delete:
7033                 return &bpf_sk_storage_delete_proto;
7034 #ifdef CONFIG_XFRM
7035         case BPF_FUNC_skb_get_xfrm_state:
7036                 return &bpf_skb_get_xfrm_state_proto;
7037 #endif
7038 #ifdef CONFIG_CGROUP_NET_CLASSID
7039         case BPF_FUNC_skb_cgroup_classid:
7040                 return &bpf_skb_cgroup_classid_proto;
7041 #endif
7042 #ifdef CONFIG_SOCK_CGROUP_DATA
7043         case BPF_FUNC_skb_cgroup_id:
7044                 return &bpf_skb_cgroup_id_proto;
7045         case BPF_FUNC_skb_ancestor_cgroup_id:
7046                 return &bpf_skb_ancestor_cgroup_id_proto;
7047 #endif
7048 #ifdef CONFIG_INET
7049         case BPF_FUNC_sk_lookup_tcp:
7050                 return &bpf_sk_lookup_tcp_proto;
7051         case BPF_FUNC_sk_lookup_udp:
7052                 return &bpf_sk_lookup_udp_proto;
7053         case BPF_FUNC_sk_release:
7054                 return &bpf_sk_release_proto;
7055         case BPF_FUNC_tcp_sock:
7056                 return &bpf_tcp_sock_proto;
7057         case BPF_FUNC_get_listener_sock:
7058                 return &bpf_get_listener_sock_proto;
7059         case BPF_FUNC_skc_lookup_tcp:
7060                 return &bpf_skc_lookup_tcp_proto;
7061         case BPF_FUNC_tcp_check_syncookie:
7062                 return &bpf_tcp_check_syncookie_proto;
7063         case BPF_FUNC_skb_ecn_set_ce:
7064                 return &bpf_skb_ecn_set_ce_proto;
7065         case BPF_FUNC_tcp_gen_syncookie:
7066                 return &bpf_tcp_gen_syncookie_proto;
7067         case BPF_FUNC_sk_assign:
7068                 return &bpf_sk_assign_proto;
7069 #endif
7070         default:
7071                 return bpf_sk_base_func_proto(func_id);
7072         }
7073 }
7074
7075 static const struct bpf_func_proto *
7076 xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7077 {
7078         switch (func_id) {
7079         case BPF_FUNC_perf_event_output:
7080                 return &bpf_xdp_event_output_proto;
7081         case BPF_FUNC_get_smp_processor_id:
7082                 return &bpf_get_smp_processor_id_proto;
7083         case BPF_FUNC_csum_diff:
7084                 return &bpf_csum_diff_proto;
7085         case BPF_FUNC_xdp_adjust_head:
7086                 return &bpf_xdp_adjust_head_proto;
7087         case BPF_FUNC_xdp_adjust_meta:
7088                 return &bpf_xdp_adjust_meta_proto;
7089         case BPF_FUNC_redirect:
7090                 return &bpf_xdp_redirect_proto;
7091         case BPF_FUNC_redirect_map:
7092                 return &bpf_xdp_redirect_map_proto;
7093         case BPF_FUNC_xdp_adjust_tail:
7094                 return &bpf_xdp_adjust_tail_proto;
7095         case BPF_FUNC_fib_lookup:
7096                 return &bpf_xdp_fib_lookup_proto;
7097 #ifdef CONFIG_INET
7098         case BPF_FUNC_sk_lookup_udp:
7099                 return &bpf_xdp_sk_lookup_udp_proto;
7100         case BPF_FUNC_sk_lookup_tcp:
7101                 return &bpf_xdp_sk_lookup_tcp_proto;
7102         case BPF_FUNC_sk_release:
7103                 return &bpf_sk_release_proto;
7104         case BPF_FUNC_skc_lookup_tcp:
7105                 return &bpf_xdp_skc_lookup_tcp_proto;
7106         case BPF_FUNC_tcp_check_syncookie:
7107                 return &bpf_tcp_check_syncookie_proto;
7108         case BPF_FUNC_tcp_gen_syncookie:
7109                 return &bpf_tcp_gen_syncookie_proto;
7110 #endif
7111         default:
7112                 return bpf_sk_base_func_proto(func_id);
7113         }
7114 }
7115
7116 const struct bpf_func_proto bpf_sock_map_update_proto __weak;
7117 const struct bpf_func_proto bpf_sock_hash_update_proto __weak;
7118
7119 static const struct bpf_func_proto *
7120 sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7121 {
7122         switch (func_id) {
7123         case BPF_FUNC_setsockopt:
7124                 return &bpf_sock_ops_setsockopt_proto;
7125         case BPF_FUNC_getsockopt:
7126                 return &bpf_sock_ops_getsockopt_proto;
7127         case BPF_FUNC_sock_ops_cb_flags_set:
7128                 return &bpf_sock_ops_cb_flags_set_proto;
7129         case BPF_FUNC_sock_map_update:
7130                 return &bpf_sock_map_update_proto;
7131         case BPF_FUNC_sock_hash_update:
7132                 return &bpf_sock_hash_update_proto;
7133         case BPF_FUNC_get_socket_cookie:
7134                 return &bpf_get_socket_cookie_sock_ops_proto;
7135         case BPF_FUNC_get_local_storage:
7136                 return &bpf_get_local_storage_proto;
7137         case BPF_FUNC_perf_event_output:
7138                 return &bpf_event_output_data_proto;
7139         case BPF_FUNC_sk_storage_get:
7140                 return &bpf_sk_storage_get_proto;
7141         case BPF_FUNC_sk_storage_delete:
7142                 return &bpf_sk_storage_delete_proto;
7143 #ifdef CONFIG_INET
7144         case BPF_FUNC_load_hdr_opt:
7145                 return &bpf_sock_ops_load_hdr_opt_proto;
7146         case BPF_FUNC_store_hdr_opt:
7147                 return &bpf_sock_ops_store_hdr_opt_proto;
7148         case BPF_FUNC_reserve_hdr_opt:
7149                 return &bpf_sock_ops_reserve_hdr_opt_proto;
7150         case BPF_FUNC_tcp_sock:
7151                 return &bpf_tcp_sock_proto;
7152 #endif /* CONFIG_INET */
7153         default:
7154                 return bpf_sk_base_func_proto(func_id);
7155         }
7156 }
7157
7158 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak;
7159 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak;
7160
7161 static const struct bpf_func_proto *
7162 sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7163 {
7164         switch (func_id) {
7165         case BPF_FUNC_msg_redirect_map:
7166                 return &bpf_msg_redirect_map_proto;
7167         case BPF_FUNC_msg_redirect_hash:
7168                 return &bpf_msg_redirect_hash_proto;
7169         case BPF_FUNC_msg_apply_bytes:
7170                 return &bpf_msg_apply_bytes_proto;
7171         case BPF_FUNC_msg_cork_bytes:
7172                 return &bpf_msg_cork_bytes_proto;
7173         case BPF_FUNC_msg_pull_data:
7174                 return &bpf_msg_pull_data_proto;
7175         case BPF_FUNC_msg_push_data:
7176                 return &bpf_msg_push_data_proto;
7177         case BPF_FUNC_msg_pop_data:
7178                 return &bpf_msg_pop_data_proto;
7179         case BPF_FUNC_perf_event_output:
7180                 return &bpf_event_output_data_proto;
7181         case BPF_FUNC_get_current_uid_gid:
7182                 return &bpf_get_current_uid_gid_proto;
7183         case BPF_FUNC_get_current_pid_tgid:
7184                 return &bpf_get_current_pid_tgid_proto;
7185         case BPF_FUNC_sk_storage_get:
7186                 return &bpf_sk_storage_get_proto;
7187         case BPF_FUNC_sk_storage_delete:
7188                 return &bpf_sk_storage_delete_proto;
7189 #ifdef CONFIG_CGROUPS
7190         case BPF_FUNC_get_current_cgroup_id:
7191                 return &bpf_get_current_cgroup_id_proto;
7192         case BPF_FUNC_get_current_ancestor_cgroup_id:
7193                 return &bpf_get_current_ancestor_cgroup_id_proto;
7194 #endif
7195 #ifdef CONFIG_CGROUP_NET_CLASSID
7196         case BPF_FUNC_get_cgroup_classid:
7197                 return &bpf_get_cgroup_classid_curr_proto;
7198 #endif
7199         default:
7200                 return bpf_sk_base_func_proto(func_id);
7201         }
7202 }
7203
7204 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak;
7205 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak;
7206
7207 static const struct bpf_func_proto *
7208 sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7209 {
7210         switch (func_id) {
7211         case BPF_FUNC_skb_store_bytes:
7212                 return &bpf_skb_store_bytes_proto;
7213         case BPF_FUNC_skb_load_bytes:
7214                 return &bpf_skb_load_bytes_proto;
7215         case BPF_FUNC_skb_pull_data:
7216                 return &sk_skb_pull_data_proto;
7217         case BPF_FUNC_skb_change_tail:
7218                 return &sk_skb_change_tail_proto;
7219         case BPF_FUNC_skb_change_head:
7220                 return &sk_skb_change_head_proto;
7221         case BPF_FUNC_get_socket_cookie:
7222                 return &bpf_get_socket_cookie_proto;
7223         case BPF_FUNC_get_socket_uid:
7224                 return &bpf_get_socket_uid_proto;
7225         case BPF_FUNC_sk_redirect_map:
7226                 return &bpf_sk_redirect_map_proto;
7227         case BPF_FUNC_sk_redirect_hash:
7228                 return &bpf_sk_redirect_hash_proto;
7229         case BPF_FUNC_perf_event_output:
7230                 return &bpf_skb_event_output_proto;
7231 #ifdef CONFIG_INET
7232         case BPF_FUNC_sk_lookup_tcp:
7233                 return &bpf_sk_lookup_tcp_proto;
7234         case BPF_FUNC_sk_lookup_udp:
7235                 return &bpf_sk_lookup_udp_proto;
7236         case BPF_FUNC_sk_release:
7237                 return &bpf_sk_release_proto;
7238         case BPF_FUNC_skc_lookup_tcp:
7239                 return &bpf_skc_lookup_tcp_proto;
7240 #endif
7241         default:
7242                 return bpf_sk_base_func_proto(func_id);
7243         }
7244 }
7245
7246 static const struct bpf_func_proto *
7247 flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7248 {
7249         switch (func_id) {
7250         case BPF_FUNC_skb_load_bytes:
7251                 return &bpf_flow_dissector_load_bytes_proto;
7252         default:
7253                 return bpf_sk_base_func_proto(func_id);
7254         }
7255 }
7256
7257 static const struct bpf_func_proto *
7258 lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7259 {
7260         switch (func_id) {
7261         case BPF_FUNC_skb_load_bytes:
7262                 return &bpf_skb_load_bytes_proto;
7263         case BPF_FUNC_skb_pull_data:
7264                 return &bpf_skb_pull_data_proto;
7265         case BPF_FUNC_csum_diff:
7266                 return &bpf_csum_diff_proto;
7267         case BPF_FUNC_get_cgroup_classid:
7268                 return &bpf_get_cgroup_classid_proto;
7269         case BPF_FUNC_get_route_realm:
7270                 return &bpf_get_route_realm_proto;
7271         case BPF_FUNC_get_hash_recalc:
7272                 return &bpf_get_hash_recalc_proto;
7273         case BPF_FUNC_perf_event_output:
7274                 return &bpf_skb_event_output_proto;
7275         case BPF_FUNC_get_smp_processor_id:
7276                 return &bpf_get_smp_processor_id_proto;
7277         case BPF_FUNC_skb_under_cgroup:
7278                 return &bpf_skb_under_cgroup_proto;
7279         default:
7280                 return bpf_sk_base_func_proto(func_id);
7281         }
7282 }
7283
7284 static const struct bpf_func_proto *
7285 lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7286 {
7287         switch (func_id) {
7288         case BPF_FUNC_lwt_push_encap:
7289                 return &bpf_lwt_in_push_encap_proto;
7290         default:
7291                 return lwt_out_func_proto(func_id, prog);
7292         }
7293 }
7294
7295 static const struct bpf_func_proto *
7296 lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7297 {
7298         switch (func_id) {
7299         case BPF_FUNC_skb_get_tunnel_key:
7300                 return &bpf_skb_get_tunnel_key_proto;
7301         case BPF_FUNC_skb_set_tunnel_key:
7302                 return bpf_get_skb_set_tunnel_proto(func_id);
7303         case BPF_FUNC_skb_get_tunnel_opt:
7304                 return &bpf_skb_get_tunnel_opt_proto;
7305         case BPF_FUNC_skb_set_tunnel_opt:
7306                 return bpf_get_skb_set_tunnel_proto(func_id);
7307         case BPF_FUNC_redirect:
7308                 return &bpf_redirect_proto;
7309         case BPF_FUNC_clone_redirect:
7310                 return &bpf_clone_redirect_proto;
7311         case BPF_FUNC_skb_change_tail:
7312                 return &bpf_skb_change_tail_proto;
7313         case BPF_FUNC_skb_change_head:
7314                 return &bpf_skb_change_head_proto;
7315         case BPF_FUNC_skb_store_bytes:
7316                 return &bpf_skb_store_bytes_proto;
7317         case BPF_FUNC_csum_update:
7318                 return &bpf_csum_update_proto;
7319         case BPF_FUNC_csum_level:
7320                 return &bpf_csum_level_proto;
7321         case BPF_FUNC_l3_csum_replace:
7322                 return &bpf_l3_csum_replace_proto;
7323         case BPF_FUNC_l4_csum_replace:
7324                 return &bpf_l4_csum_replace_proto;
7325         case BPF_FUNC_set_hash_invalid:
7326                 return &bpf_set_hash_invalid_proto;
7327         case BPF_FUNC_lwt_push_encap:
7328                 return &bpf_lwt_xmit_push_encap_proto;
7329         default:
7330                 return lwt_out_func_proto(func_id, prog);
7331         }
7332 }
7333
7334 static const struct bpf_func_proto *
7335 lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7336 {
7337         switch (func_id) {
7338 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
7339         case BPF_FUNC_lwt_seg6_store_bytes:
7340                 return &bpf_lwt_seg6_store_bytes_proto;
7341         case BPF_FUNC_lwt_seg6_action:
7342                 return &bpf_lwt_seg6_action_proto;
7343         case BPF_FUNC_lwt_seg6_adjust_srh:
7344                 return &bpf_lwt_seg6_adjust_srh_proto;
7345 #endif
7346         default:
7347                 return lwt_out_func_proto(func_id, prog);
7348         }
7349 }
7350
7351 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type,
7352                                     const struct bpf_prog *prog,
7353                                     struct bpf_insn_access_aux *info)
7354 {
7355         const int size_default = sizeof(__u32);
7356
7357         if (off < 0 || off >= sizeof(struct __sk_buff))
7358                 return false;
7359
7360         /* The verifier guarantees that size > 0. */
7361         if (off % size != 0)
7362                 return false;
7363
7364         switch (off) {
7365         case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
7366                 if (off + size > offsetofend(struct __sk_buff, cb[4]))
7367                         return false;
7368                 break;
7369         case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]):
7370         case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]):
7371         case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4):
7372         case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4):
7373         case bpf_ctx_range(struct __sk_buff, data):
7374         case bpf_ctx_range(struct __sk_buff, data_meta):
7375         case bpf_ctx_range(struct __sk_buff, data_end):
7376                 if (size != size_default)
7377                         return false;
7378                 break;
7379         case bpf_ctx_range_ptr(struct __sk_buff, flow_keys):
7380                 return false;
7381         case bpf_ctx_range(struct __sk_buff, tstamp):
7382                 if (size != sizeof(__u64))
7383                         return false;
7384                 break;
7385         case offsetof(struct __sk_buff, sk):
7386                 if (type == BPF_WRITE || size != sizeof(__u64))
7387                         return false;
7388                 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL;
7389                 break;
7390         default:
7391                 /* Only narrow read access allowed for now. */
7392                 if (type == BPF_WRITE) {
7393                         if (size != size_default)
7394                                 return false;
7395                 } else {
7396                         bpf_ctx_record_field_size(info, size_default);
7397                         if (!bpf_ctx_narrow_access_ok(off, size, size_default))
7398                                 return false;
7399                 }
7400         }
7401
7402         return true;
7403 }
7404
7405 static bool sk_filter_is_valid_access(int off, int size,
7406                                       enum bpf_access_type type,
7407                                       const struct bpf_prog *prog,
7408                                       struct bpf_insn_access_aux *info)
7409 {
7410         switch (off) {
7411         case bpf_ctx_range(struct __sk_buff, tc_classid):
7412         case bpf_ctx_range(struct __sk_buff, data):
7413         case bpf_ctx_range(struct __sk_buff, data_meta):
7414         case bpf_ctx_range(struct __sk_buff, data_end):
7415         case bpf_ctx_range_till(struct __sk_buff, family, local_port):
7416         case bpf_ctx_range(struct __sk_buff, tstamp):
7417         case bpf_ctx_range(struct __sk_buff, wire_len):
7418                 return false;
7419         }
7420
7421         if (type == BPF_WRITE) {
7422                 switch (off) {
7423                 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
7424                         break;
7425                 default:
7426                         return false;
7427                 }
7428         }
7429
7430         return bpf_skb_is_valid_access(off, size, type, prog, info);
7431 }
7432
7433 static bool cg_skb_is_valid_access(int off, int size,
7434                                    enum bpf_access_type type,
7435                                    const struct bpf_prog *prog,
7436                                    struct bpf_insn_access_aux *info)
7437 {
7438         switch (off) {
7439         case bpf_ctx_range(struct __sk_buff, tc_classid):
7440         case bpf_ctx_range(struct __sk_buff, data_meta):
7441         case bpf_ctx_range(struct __sk_buff, wire_len):
7442                 return false;
7443         case bpf_ctx_range(struct __sk_buff, data):
7444         case bpf_ctx_range(struct __sk_buff, data_end):
7445                 if (!bpf_capable())
7446                         return false;
7447                 break;
7448         }
7449
7450         if (type == BPF_WRITE) {
7451                 switch (off) {
7452                 case bpf_ctx_range(struct __sk_buff, mark):
7453                 case bpf_ctx_range(struct __sk_buff, priority):
7454                 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
7455                         break;
7456                 case bpf_ctx_range(struct __sk_buff, tstamp):
7457                         if (!bpf_capable())
7458                                 return false;
7459                         break;
7460                 default:
7461                         return false;
7462                 }
7463         }
7464
7465         switch (off) {
7466         case bpf_ctx_range(struct __sk_buff, data):
7467                 info->reg_type = PTR_TO_PACKET;
7468                 break;
7469         case bpf_ctx_range(struct __sk_buff, data_end):
7470                 info->reg_type = PTR_TO_PACKET_END;
7471                 break;
7472         }
7473
7474         return bpf_skb_is_valid_access(off, size, type, prog, info);
7475 }
7476
7477 static bool lwt_is_valid_access(int off, int size,
7478                                 enum bpf_access_type type,
7479                                 const struct bpf_prog *prog,
7480                                 struct bpf_insn_access_aux *info)
7481 {
7482         switch (off) {
7483         case bpf_ctx_range(struct __sk_buff, tc_classid):
7484         case bpf_ctx_range_till(struct __sk_buff, family, local_port):
7485         case bpf_ctx_range(struct __sk_buff, data_meta):
7486         case bpf_ctx_range(struct __sk_buff, tstamp):
7487         case bpf_ctx_range(struct __sk_buff, wire_len):
7488                 return false;
7489         }
7490
7491         if (type == BPF_WRITE) {
7492                 switch (off) {
7493                 case bpf_ctx_range(struct __sk_buff, mark):
7494                 case bpf_ctx_range(struct __sk_buff, priority):
7495                 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
7496                         break;
7497                 default:
7498                         return false;
7499                 }
7500         }
7501
7502         switch (off) {
7503         case bpf_ctx_range(struct __sk_buff, data):
7504                 info->reg_type = PTR_TO_PACKET;
7505                 break;
7506         case bpf_ctx_range(struct __sk_buff, data_end):
7507                 info->reg_type = PTR_TO_PACKET_END;
7508                 break;
7509         }
7510
7511         return bpf_skb_is_valid_access(off, size, type, prog, info);
7512 }
7513
7514 /* Attach type specific accesses */
7515 static bool __sock_filter_check_attach_type(int off,
7516                                             enum bpf_access_type access_type,
7517                                             enum bpf_attach_type attach_type)
7518 {
7519         switch (off) {
7520         case offsetof(struct bpf_sock, bound_dev_if):
7521         case offsetof(struct bpf_sock, mark):
7522         case offsetof(struct bpf_sock, priority):
7523                 switch (attach_type) {
7524                 case BPF_CGROUP_INET_SOCK_CREATE:
7525                 case BPF_CGROUP_INET_SOCK_RELEASE:
7526                         goto full_access;
7527                 default:
7528                         return false;
7529                 }
7530         case bpf_ctx_range(struct bpf_sock, src_ip4):
7531                 switch (attach_type) {
7532                 case BPF_CGROUP_INET4_POST_BIND:
7533                         goto read_only;
7534                 default:
7535                         return false;
7536                 }
7537         case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
7538                 switch (attach_type) {
7539                 case BPF_CGROUP_INET6_POST_BIND:
7540                         goto read_only;
7541                 default:
7542                         return false;
7543                 }
7544         case bpf_ctx_range(struct bpf_sock, src_port):
7545                 switch (attach_type) {
7546                 case BPF_CGROUP_INET4_POST_BIND:
7547                 case BPF_CGROUP_INET6_POST_BIND:
7548                         goto read_only;
7549                 default:
7550                         return false;
7551                 }
7552         }
7553 read_only:
7554         return access_type == BPF_READ;
7555 full_access:
7556         return true;
7557 }
7558
7559 bool bpf_sock_common_is_valid_access(int off, int size,
7560                                      enum bpf_access_type type,
7561                                      struct bpf_insn_access_aux *info)
7562 {
7563         switch (off) {
7564         case bpf_ctx_range_till(struct bpf_sock, type, priority):
7565                 return false;
7566         default:
7567                 return bpf_sock_is_valid_access(off, size, type, info);
7568         }
7569 }
7570
7571 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
7572                               struct bpf_insn_access_aux *info)
7573 {
7574         const int size_default = sizeof(__u32);
7575
7576         if (off < 0 || off >= sizeof(struct bpf_sock))
7577                 return false;
7578         if (off % size != 0)
7579                 return false;
7580
7581         switch (off) {
7582         case offsetof(struct bpf_sock, state):
7583         case offsetof(struct bpf_sock, family):
7584         case offsetof(struct bpf_sock, type):
7585         case offsetof(struct bpf_sock, protocol):
7586         case offsetof(struct bpf_sock, dst_port):
7587         case offsetof(struct bpf_sock, src_port):
7588         case offsetof(struct bpf_sock, rx_queue_mapping):
7589         case bpf_ctx_range(struct bpf_sock, src_ip4):
7590         case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
7591         case bpf_ctx_range(struct bpf_sock, dst_ip4):
7592         case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]):
7593                 bpf_ctx_record_field_size(info, size_default);
7594                 return bpf_ctx_narrow_access_ok(off, size, size_default);
7595         }
7596
7597         return size == size_default;
7598 }
7599
7600 static bool sock_filter_is_valid_access(int off, int size,
7601                                         enum bpf_access_type type,
7602                                         const struct bpf_prog *prog,
7603                                         struct bpf_insn_access_aux *info)
7604 {
7605         if (!bpf_sock_is_valid_access(off, size, type, info))
7606                 return false;
7607         return __sock_filter_check_attach_type(off, type,
7608                                                prog->expected_attach_type);
7609 }
7610
7611 static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write,
7612                              const struct bpf_prog *prog)
7613 {
7614         /* Neither direct read nor direct write requires any preliminary
7615          * action.
7616          */
7617         return 0;
7618 }
7619
7620 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write,
7621                                 const struct bpf_prog *prog, int drop_verdict)
7622 {
7623         struct bpf_insn *insn = insn_buf;
7624
7625         if (!direct_write)
7626                 return 0;
7627
7628         /* if (!skb->cloned)
7629          *       goto start;
7630          *
7631          * (Fast-path, otherwise approximation that we might be
7632          *  a clone, do the rest in helper.)
7633          */
7634         *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET());
7635         *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK);
7636         *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7);
7637
7638         /* ret = bpf_skb_pull_data(skb, 0); */
7639         *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
7640         *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2);
7641         *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
7642                                BPF_FUNC_skb_pull_data);
7643         /* if (!ret)
7644          *      goto restore;
7645          * return TC_ACT_SHOT;
7646          */
7647         *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2);
7648         *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict);
7649         *insn++ = BPF_EXIT_INSN();
7650
7651         /* restore: */
7652         *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6);
7653         /* start: */
7654         *insn++ = prog->insnsi[0];
7655
7656         return insn - insn_buf;
7657 }
7658
7659 static int bpf_gen_ld_abs(const struct bpf_insn *orig,
7660                           struct bpf_insn *insn_buf)
7661 {
7662         bool indirect = BPF_MODE(orig->code) == BPF_IND;
7663         struct bpf_insn *insn = insn_buf;
7664
7665         if (!indirect) {
7666                 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm);
7667         } else {
7668                 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg);
7669                 if (orig->imm)
7670                         *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm);
7671         }
7672         /* We're guaranteed here that CTX is in R6. */
7673         *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX);
7674
7675         switch (BPF_SIZE(orig->code)) {
7676         case BPF_B:
7677                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache);
7678                 break;
7679         case BPF_H:
7680                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache);
7681                 break;
7682         case BPF_W:
7683                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache);
7684                 break;
7685         }
7686
7687         *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2);
7688         *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0);
7689         *insn++ = BPF_EXIT_INSN();
7690
7691         return insn - insn_buf;
7692 }
7693
7694 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write,
7695                                const struct bpf_prog *prog)
7696 {
7697         return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT);
7698 }
7699
7700 static bool tc_cls_act_is_valid_access(int off, int size,
7701                                        enum bpf_access_type type,
7702                                        const struct bpf_prog *prog,
7703                                        struct bpf_insn_access_aux *info)
7704 {
7705         if (type == BPF_WRITE) {
7706                 switch (off) {
7707                 case bpf_ctx_range(struct __sk_buff, mark):
7708                 case bpf_ctx_range(struct __sk_buff, tc_index):
7709                 case bpf_ctx_range(struct __sk_buff, priority):
7710                 case bpf_ctx_range(struct __sk_buff, tc_classid):
7711                 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
7712                 case bpf_ctx_range(struct __sk_buff, tstamp):
7713                 case bpf_ctx_range(struct __sk_buff, queue_mapping):
7714                         break;
7715                 default:
7716                         return false;
7717                 }
7718         }
7719
7720         switch (off) {
7721         case bpf_ctx_range(struct __sk_buff, data):
7722                 info->reg_type = PTR_TO_PACKET;
7723                 break;
7724         case bpf_ctx_range(struct __sk_buff, data_meta):
7725                 info->reg_type = PTR_TO_PACKET_META;
7726                 break;
7727         case bpf_ctx_range(struct __sk_buff, data_end):
7728                 info->reg_type = PTR_TO_PACKET_END;
7729                 break;
7730         case bpf_ctx_range_till(struct __sk_buff, family, local_port):
7731                 return false;
7732         }
7733
7734         return bpf_skb_is_valid_access(off, size, type, prog, info);
7735 }
7736
7737 static bool __is_valid_xdp_access(int off, int size)
7738 {
7739         if (off < 0 || off >= sizeof(struct xdp_md))
7740                 return false;
7741         if (off % size != 0)
7742                 return false;
7743         if (size != sizeof(__u32))
7744                 return false;
7745
7746         return true;
7747 }
7748
7749 static bool xdp_is_valid_access(int off, int size,
7750                                 enum bpf_access_type type,
7751                                 const struct bpf_prog *prog,
7752                                 struct bpf_insn_access_aux *info)
7753 {
7754         if (prog->expected_attach_type != BPF_XDP_DEVMAP) {
7755                 switch (off) {
7756                 case offsetof(struct xdp_md, egress_ifindex):
7757                         return false;
7758                 }
7759         }
7760
7761         if (type == BPF_WRITE) {
7762                 if (bpf_prog_is_dev_bound(prog->aux)) {
7763                         switch (off) {
7764                         case offsetof(struct xdp_md, rx_queue_index):
7765                                 return __is_valid_xdp_access(off, size);
7766                         }
7767                 }
7768                 return false;
7769         }
7770
7771         switch (off) {
7772         case offsetof(struct xdp_md, data):
7773                 info->reg_type = PTR_TO_PACKET;
7774                 break;
7775         case offsetof(struct xdp_md, data_meta):
7776                 info->reg_type = PTR_TO_PACKET_META;
7777                 break;
7778         case offsetof(struct xdp_md, data_end):
7779                 info->reg_type = PTR_TO_PACKET_END;
7780                 break;
7781         }
7782
7783         return __is_valid_xdp_access(off, size);
7784 }
7785
7786 void bpf_warn_invalid_xdp_action(u32 act)
7787 {
7788         const u32 act_max = XDP_REDIRECT;
7789
7790         WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n",
7791                   act > act_max ? "Illegal" : "Driver unsupported",
7792                   act);
7793 }
7794 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
7795
7796 static bool sock_addr_is_valid_access(int off, int size,
7797                                       enum bpf_access_type type,
7798                                       const struct bpf_prog *prog,
7799                                       struct bpf_insn_access_aux *info)
7800 {
7801         const int size_default = sizeof(__u32);
7802
7803         if (off < 0 || off >= sizeof(struct bpf_sock_addr))
7804                 return false;
7805         if (off % size != 0)
7806                 return false;
7807
7808         /* Disallow access to IPv6 fields from IPv4 contex and vise
7809          * versa.
7810          */
7811         switch (off) {
7812         case bpf_ctx_range(struct bpf_sock_addr, user_ip4):
7813                 switch (prog->expected_attach_type) {
7814                 case BPF_CGROUP_INET4_BIND:
7815                 case BPF_CGROUP_INET4_CONNECT:
7816                 case BPF_CGROUP_INET4_GETPEERNAME:
7817                 case BPF_CGROUP_INET4_GETSOCKNAME:
7818                 case BPF_CGROUP_UDP4_SENDMSG:
7819                 case BPF_CGROUP_UDP4_RECVMSG:
7820                         break;
7821                 default:
7822                         return false;
7823                 }
7824                 break;
7825         case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
7826                 switch (prog->expected_attach_type) {
7827                 case BPF_CGROUP_INET6_BIND:
7828                 case BPF_CGROUP_INET6_CONNECT:
7829                 case BPF_CGROUP_INET6_GETPEERNAME:
7830                 case BPF_CGROUP_INET6_GETSOCKNAME:
7831                 case BPF_CGROUP_UDP6_SENDMSG:
7832                 case BPF_CGROUP_UDP6_RECVMSG:
7833                         break;
7834                 default:
7835                         return false;
7836                 }
7837                 break;
7838         case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4):
7839                 switch (prog->expected_attach_type) {
7840                 case BPF_CGROUP_UDP4_SENDMSG:
7841                         break;
7842                 default:
7843                         return false;
7844                 }
7845                 break;
7846         case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
7847                                 msg_src_ip6[3]):
7848                 switch (prog->expected_attach_type) {
7849                 case BPF_CGROUP_UDP6_SENDMSG:
7850                         break;
7851                 default:
7852                         return false;
7853                 }
7854                 break;
7855         }
7856
7857         switch (off) {
7858         case bpf_ctx_range(struct bpf_sock_addr, user_ip4):
7859         case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
7860         case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4):
7861         case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
7862                                 msg_src_ip6[3]):
7863         case bpf_ctx_range(struct bpf_sock_addr, user_port):
7864                 if (type == BPF_READ) {
7865                         bpf_ctx_record_field_size(info, size_default);
7866
7867                         if (bpf_ctx_wide_access_ok(off, size,
7868                                                    struct bpf_sock_addr,
7869                                                    user_ip6))
7870                                 return true;
7871
7872                         if (bpf_ctx_wide_access_ok(off, size,
7873                                                    struct bpf_sock_addr,
7874                                                    msg_src_ip6))
7875                                 return true;
7876
7877                         if (!bpf_ctx_narrow_access_ok(off, size, size_default))
7878                                 return false;
7879                 } else {
7880                         if (bpf_ctx_wide_access_ok(off, size,
7881                                                    struct bpf_sock_addr,
7882                                                    user_ip6))
7883                                 return true;
7884
7885                         if (bpf_ctx_wide_access_ok(off, size,
7886                                                    struct bpf_sock_addr,
7887                                                    msg_src_ip6))
7888                                 return true;
7889
7890                         if (size != size_default)
7891                                 return false;
7892                 }
7893                 break;
7894         case offsetof(struct bpf_sock_addr, sk):
7895                 if (type != BPF_READ)
7896                         return false;
7897                 if (size != sizeof(__u64))
7898                         return false;
7899                 info->reg_type = PTR_TO_SOCKET;
7900                 break;
7901         default:
7902                 if (type == BPF_READ) {
7903                         if (size != size_default)
7904                                 return false;
7905                 } else {
7906                         return false;
7907                 }
7908         }
7909
7910         return true;
7911 }
7912
7913 static bool sock_ops_is_valid_access(int off, int size,
7914                                      enum bpf_access_type type,
7915                                      const struct bpf_prog *prog,
7916                                      struct bpf_insn_access_aux *info)
7917 {
7918         const int size_default = sizeof(__u32);
7919
7920         if (off < 0 || off >= sizeof(struct bpf_sock_ops))
7921                 return false;
7922
7923         /* The verifier guarantees that size > 0. */
7924         if (off % size != 0)
7925                 return false;
7926
7927         if (type == BPF_WRITE) {
7928                 switch (off) {
7929                 case offsetof(struct bpf_sock_ops, reply):
7930                 case offsetof(struct bpf_sock_ops, sk_txhash):
7931                         if (size != size_default)
7932                                 return false;
7933                         break;
7934                 default:
7935                         return false;
7936                 }
7937         } else {
7938                 switch (off) {
7939                 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received,
7940                                         bytes_acked):
7941                         if (size != sizeof(__u64))
7942                                 return false;
7943                         break;
7944                 case offsetof(struct bpf_sock_ops, sk):
7945                         if (size != sizeof(__u64))
7946                                 return false;
7947                         info->reg_type = PTR_TO_SOCKET_OR_NULL;
7948                         break;
7949                 case offsetof(struct bpf_sock_ops, skb_data):
7950                         if (size != sizeof(__u64))
7951                                 return false;
7952                         info->reg_type = PTR_TO_PACKET;
7953                         break;
7954                 case offsetof(struct bpf_sock_ops, skb_data_end):
7955                         if (size != sizeof(__u64))
7956                                 return false;
7957                         info->reg_type = PTR_TO_PACKET_END;
7958                         break;
7959                 case offsetof(struct bpf_sock_ops, skb_tcp_flags):
7960                         bpf_ctx_record_field_size(info, size_default);
7961                         return bpf_ctx_narrow_access_ok(off, size,
7962                                                         size_default);
7963                 default:
7964                         if (size != size_default)
7965                                 return false;
7966                         break;
7967                 }
7968         }
7969
7970         return true;
7971 }
7972
7973 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write,
7974                            const struct bpf_prog *prog)
7975 {
7976         return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP);
7977 }
7978
7979 static bool sk_skb_is_valid_access(int off, int size,
7980                                    enum bpf_access_type type,
7981                                    const struct bpf_prog *prog,
7982                                    struct bpf_insn_access_aux *info)
7983 {
7984         switch (off) {
7985         case bpf_ctx_range(struct __sk_buff, tc_classid):
7986         case bpf_ctx_range(struct __sk_buff, data_meta):
7987         case bpf_ctx_range(struct __sk_buff, tstamp):
7988         case bpf_ctx_range(struct __sk_buff, wire_len):
7989                 return false;
7990         }
7991
7992         if (type == BPF_WRITE) {
7993                 switch (off) {
7994                 case bpf_ctx_range(struct __sk_buff, tc_index):
7995                 case bpf_ctx_range(struct __sk_buff, priority):
7996                         break;
7997                 default:
7998                         return false;
7999                 }
8000         }
8001
8002         switch (off) {
8003         case bpf_ctx_range(struct __sk_buff, mark):
8004                 return false;
8005         case bpf_ctx_range(struct __sk_buff, data):
8006                 info->reg_type = PTR_TO_PACKET;
8007                 break;
8008         case bpf_ctx_range(struct __sk_buff, data_end):
8009                 info->reg_type = PTR_TO_PACKET_END;
8010                 break;
8011         }
8012
8013         return bpf_skb_is_valid_access(off, size, type, prog, info);
8014 }
8015
8016 static bool sk_msg_is_valid_access(int off, int size,
8017                                    enum bpf_access_type type,
8018                                    const struct bpf_prog *prog,
8019                                    struct bpf_insn_access_aux *info)
8020 {
8021         if (type == BPF_WRITE)
8022                 return false;
8023
8024         if (off % size != 0)
8025                 return false;
8026
8027         switch (off) {
8028         case offsetof(struct sk_msg_md, data):
8029                 info->reg_type = PTR_TO_PACKET;
8030                 if (size != sizeof(__u64))
8031                         return false;
8032                 break;
8033         case offsetof(struct sk_msg_md, data_end):
8034                 info->reg_type = PTR_TO_PACKET_END;
8035                 if (size != sizeof(__u64))
8036                         return false;
8037                 break;
8038         case offsetof(struct sk_msg_md, sk):
8039                 if (size != sizeof(__u64))
8040                         return false;
8041                 info->reg_type = PTR_TO_SOCKET;
8042                 break;
8043         case bpf_ctx_range(struct sk_msg_md, family):
8044         case bpf_ctx_range(struct sk_msg_md, remote_ip4):
8045         case bpf_ctx_range(struct sk_msg_md, local_ip4):
8046         case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]):
8047         case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]):
8048         case bpf_ctx_range(struct sk_msg_md, remote_port):
8049         case bpf_ctx_range(struct sk_msg_md, local_port):
8050         case bpf_ctx_range(struct sk_msg_md, size):
8051                 if (size != sizeof(__u32))
8052                         return false;
8053                 break;
8054         default:
8055                 return false;
8056         }
8057         return true;
8058 }
8059
8060 static bool flow_dissector_is_valid_access(int off, int size,
8061                                            enum bpf_access_type type,
8062                                            const struct bpf_prog *prog,
8063                                            struct bpf_insn_access_aux *info)
8064 {
8065         const int size_default = sizeof(__u32);
8066
8067         if (off < 0 || off >= sizeof(struct __sk_buff))
8068                 return false;
8069
8070         if (type == BPF_WRITE)
8071                 return false;
8072
8073         switch (off) {
8074         case bpf_ctx_range(struct __sk_buff, data):
8075                 if (size != size_default)
8076                         return false;
8077                 info->reg_type = PTR_TO_PACKET;
8078                 return true;
8079         case bpf_ctx_range(struct __sk_buff, data_end):
8080                 if (size != size_default)
8081                         return false;
8082                 info->reg_type = PTR_TO_PACKET_END;
8083                 return true;
8084         case bpf_ctx_range_ptr(struct __sk_buff, flow_keys):
8085                 if (size != sizeof(__u64))
8086                         return false;
8087                 info->reg_type = PTR_TO_FLOW_KEYS;
8088                 return true;
8089         default:
8090                 return false;
8091         }
8092 }
8093
8094 static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type,
8095                                              const struct bpf_insn *si,
8096                                              struct bpf_insn *insn_buf,
8097                                              struct bpf_prog *prog,
8098                                              u32 *target_size)
8099
8100 {
8101         struct bpf_insn *insn = insn_buf;
8102
8103         switch (si->off) {
8104         case offsetof(struct __sk_buff, data):
8105                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data),
8106                                       si->dst_reg, si->src_reg,
8107                                       offsetof(struct bpf_flow_dissector, data));
8108                 break;
8109
8110         case offsetof(struct __sk_buff, data_end):
8111                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end),
8112                                       si->dst_reg, si->src_reg,
8113                                       offsetof(struct bpf_flow_dissector, data_end));
8114                 break;
8115
8116         case offsetof(struct __sk_buff, flow_keys):
8117                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys),
8118                                       si->dst_reg, si->src_reg,
8119                                       offsetof(struct bpf_flow_dissector, flow_keys));
8120                 break;
8121         }
8122
8123         return insn - insn_buf;
8124 }
8125
8126 static struct bpf_insn *bpf_convert_shinfo_access(const struct bpf_insn *si,
8127                                                   struct bpf_insn *insn)
8128 {
8129         /* si->dst_reg = skb_shinfo(SKB); */
8130 #ifdef NET_SKBUFF_DATA_USES_OFFSET
8131         *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end),
8132                               BPF_REG_AX, si->src_reg,
8133                               offsetof(struct sk_buff, end));
8134         *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head),
8135                               si->dst_reg, si->src_reg,
8136                               offsetof(struct sk_buff, head));
8137         *insn++ = BPF_ALU64_REG(BPF_ADD, si->dst_reg, BPF_REG_AX);
8138 #else
8139         *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end),
8140                               si->dst_reg, si->src_reg,
8141                               offsetof(struct sk_buff, end));
8142 #endif
8143
8144         return insn;
8145 }
8146
8147 static u32 bpf_convert_ctx_access(enum bpf_access_type type,
8148                                   const struct bpf_insn *si,
8149                                   struct bpf_insn *insn_buf,
8150                                   struct bpf_prog *prog, u32 *target_size)
8151 {
8152         struct bpf_insn *insn = insn_buf;
8153         int off;
8154
8155         switch (si->off) {
8156         case offsetof(struct __sk_buff, len):
8157                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8158                                       bpf_target_off(struct sk_buff, len, 4,
8159                                                      target_size));
8160                 break;
8161
8162         case offsetof(struct __sk_buff, protocol):
8163                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
8164                                       bpf_target_off(struct sk_buff, protocol, 2,
8165                                                      target_size));
8166                 break;
8167
8168         case offsetof(struct __sk_buff, vlan_proto):
8169                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
8170                                       bpf_target_off(struct sk_buff, vlan_proto, 2,
8171                                                      target_size));
8172                 break;
8173
8174         case offsetof(struct __sk_buff, priority):
8175                 if (type == BPF_WRITE)
8176                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
8177                                               bpf_target_off(struct sk_buff, priority, 4,
8178                                                              target_size));
8179                 else
8180                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8181                                               bpf_target_off(struct sk_buff, priority, 4,
8182                                                              target_size));
8183                 break;
8184
8185         case offsetof(struct __sk_buff, ingress_ifindex):
8186                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8187                                       bpf_target_off(struct sk_buff, skb_iif, 4,
8188                                                      target_size));
8189                 break;
8190
8191         case offsetof(struct __sk_buff, ifindex):
8192                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
8193                                       si->dst_reg, si->src_reg,
8194                                       offsetof(struct sk_buff, dev));
8195                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
8196                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8197                                       bpf_target_off(struct net_device, ifindex, 4,
8198                                                      target_size));
8199                 break;
8200
8201         case offsetof(struct __sk_buff, hash):
8202                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8203                                       bpf_target_off(struct sk_buff, hash, 4,
8204                                                      target_size));
8205                 break;
8206
8207         case offsetof(struct __sk_buff, mark):
8208                 if (type == BPF_WRITE)
8209                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
8210                                               bpf_target_off(struct sk_buff, mark, 4,
8211                                                              target_size));
8212                 else
8213                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8214                                               bpf_target_off(struct sk_buff, mark, 4,
8215                                                              target_size));
8216                 break;
8217
8218         case offsetof(struct __sk_buff, pkt_type):
8219                 *target_size = 1;
8220                 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg,
8221                                       PKT_TYPE_OFFSET());
8222                 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX);
8223 #ifdef __BIG_ENDIAN_BITFIELD
8224                 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5);
8225 #endif
8226                 break;
8227
8228         case offsetof(struct __sk_buff, queue_mapping):
8229                 if (type == BPF_WRITE) {
8230                         *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1);
8231                         *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg,
8232                                               bpf_target_off(struct sk_buff,
8233                                                              queue_mapping,
8234                                                              2, target_size));
8235                 } else {
8236                         *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
8237                                               bpf_target_off(struct sk_buff,
8238                                                              queue_mapping,
8239                                                              2, target_size));
8240                 }
8241                 break;
8242
8243         case offsetof(struct __sk_buff, vlan_present):
8244                 *target_size = 1;
8245                 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg,
8246                                       PKT_VLAN_PRESENT_OFFSET());
8247                 if (PKT_VLAN_PRESENT_BIT)
8248                         *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, PKT_VLAN_PRESENT_BIT);
8249                 if (PKT_VLAN_PRESENT_BIT < 7)
8250                         *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1);
8251                 break;
8252
8253         case offsetof(struct __sk_buff, vlan_tci):
8254                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
8255                                       bpf_target_off(struct sk_buff, vlan_tci, 2,
8256                                                      target_size));
8257                 break;
8258
8259         case offsetof(struct __sk_buff, cb[0]) ...
8260              offsetofend(struct __sk_buff, cb[4]) - 1:
8261                 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, data) < 20);
8262                 BUILD_BUG_ON((offsetof(struct sk_buff, cb) +
8263                               offsetof(struct qdisc_skb_cb, data)) %
8264                              sizeof(__u64));
8265
8266                 prog->cb_access = 1;
8267                 off  = si->off;
8268                 off -= offsetof(struct __sk_buff, cb[0]);
8269                 off += offsetof(struct sk_buff, cb);
8270                 off += offsetof(struct qdisc_skb_cb, data);
8271                 if (type == BPF_WRITE)
8272                         *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg,
8273                                               si->src_reg, off);
8274                 else
8275                         *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg,
8276                                               si->src_reg, off);
8277                 break;
8278
8279         case offsetof(struct __sk_buff, tc_classid):
8280                 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, tc_classid) != 2);
8281
8282                 off  = si->off;
8283                 off -= offsetof(struct __sk_buff, tc_classid);
8284                 off += offsetof(struct sk_buff, cb);
8285                 off += offsetof(struct qdisc_skb_cb, tc_classid);
8286                 *target_size = 2;
8287                 if (type == BPF_WRITE)
8288                         *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg,
8289                                               si->src_reg, off);
8290                 else
8291                         *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg,
8292                                               si->src_reg, off);
8293                 break;
8294
8295         case offsetof(struct __sk_buff, data):
8296                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
8297                                       si->dst_reg, si->src_reg,
8298                                       offsetof(struct sk_buff, data));
8299                 break;
8300
8301         case offsetof(struct __sk_buff, data_meta):
8302                 off  = si->off;
8303                 off -= offsetof(struct __sk_buff, data_meta);
8304                 off += offsetof(struct sk_buff, cb);
8305                 off += offsetof(struct bpf_skb_data_end, data_meta);
8306                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
8307                                       si->src_reg, off);
8308                 break;
8309
8310         case offsetof(struct __sk_buff, data_end):
8311                 off  = si->off;
8312                 off -= offsetof(struct __sk_buff, data_end);
8313                 off += offsetof(struct sk_buff, cb);
8314                 off += offsetof(struct bpf_skb_data_end, data_end);
8315                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
8316                                       si->src_reg, off);
8317                 break;
8318
8319         case offsetof(struct __sk_buff, tc_index):
8320 #ifdef CONFIG_NET_SCHED
8321                 if (type == BPF_WRITE)
8322                         *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg,
8323                                               bpf_target_off(struct sk_buff, tc_index, 2,
8324                                                              target_size));
8325                 else
8326                         *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
8327                                               bpf_target_off(struct sk_buff, tc_index, 2,
8328                                                              target_size));
8329 #else
8330                 *target_size = 2;
8331                 if (type == BPF_WRITE)
8332                         *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg);
8333                 else
8334                         *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
8335 #endif
8336                 break;
8337
8338         case offsetof(struct __sk_buff, napi_id):
8339 #if defined(CONFIG_NET_RX_BUSY_POLL)
8340                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8341                                       bpf_target_off(struct sk_buff, napi_id, 4,
8342                                                      target_size));
8343                 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1);
8344                 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
8345 #else
8346                 *target_size = 4;
8347                 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
8348 #endif
8349                 break;
8350         case offsetof(struct __sk_buff, family):
8351                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2);
8352
8353                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8354                                       si->dst_reg, si->src_reg,
8355                                       offsetof(struct sk_buff, sk));
8356                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
8357                                       bpf_target_off(struct sock_common,
8358                                                      skc_family,
8359                                                      2, target_size));
8360                 break;
8361         case offsetof(struct __sk_buff, remote_ip4):
8362                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4);
8363
8364                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8365                                       si->dst_reg, si->src_reg,
8366                                       offsetof(struct sk_buff, sk));
8367                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8368                                       bpf_target_off(struct sock_common,
8369                                                      skc_daddr,
8370                                                      4, target_size));
8371                 break;
8372         case offsetof(struct __sk_buff, local_ip4):
8373                 BUILD_BUG_ON(sizeof_field(struct sock_common,
8374                                           skc_rcv_saddr) != 4);
8375
8376                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8377                                       si->dst_reg, si->src_reg,
8378                                       offsetof(struct sk_buff, sk));
8379                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8380                                       bpf_target_off(struct sock_common,
8381                                                      skc_rcv_saddr,
8382                                                      4, target_size));
8383                 break;
8384         case offsetof(struct __sk_buff, remote_ip6[0]) ...
8385              offsetof(struct __sk_buff, remote_ip6[3]):
8386 #if IS_ENABLED(CONFIG_IPV6)
8387                 BUILD_BUG_ON(sizeof_field(struct sock_common,
8388                                           skc_v6_daddr.s6_addr32[0]) != 4);
8389
8390                 off = si->off;
8391                 off -= offsetof(struct __sk_buff, remote_ip6[0]);
8392
8393                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8394                                       si->dst_reg, si->src_reg,
8395                                       offsetof(struct sk_buff, sk));
8396                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8397                                       offsetof(struct sock_common,
8398                                                skc_v6_daddr.s6_addr32[0]) +
8399                                       off);
8400 #else
8401                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
8402 #endif
8403                 break;
8404         case offsetof(struct __sk_buff, local_ip6[0]) ...
8405              offsetof(struct __sk_buff, local_ip6[3]):
8406 #if IS_ENABLED(CONFIG_IPV6)
8407                 BUILD_BUG_ON(sizeof_field(struct sock_common,
8408                                           skc_v6_rcv_saddr.s6_addr32[0]) != 4);
8409
8410                 off = si->off;
8411                 off -= offsetof(struct __sk_buff, local_ip6[0]);
8412
8413                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8414                                       si->dst_reg, si->src_reg,
8415                                       offsetof(struct sk_buff, sk));
8416                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8417                                       offsetof(struct sock_common,
8418                                                skc_v6_rcv_saddr.s6_addr32[0]) +
8419                                       off);
8420 #else
8421                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
8422 #endif
8423                 break;
8424
8425         case offsetof(struct __sk_buff, remote_port):
8426                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2);
8427
8428                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8429                                       si->dst_reg, si->src_reg,
8430                                       offsetof(struct sk_buff, sk));
8431                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
8432                                       bpf_target_off(struct sock_common,
8433                                                      skc_dport,
8434                                                      2, target_size));
8435 #ifndef __BIG_ENDIAN_BITFIELD
8436                 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
8437 #endif
8438                 break;
8439
8440         case offsetof(struct __sk_buff, local_port):
8441                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2);
8442
8443                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8444                                       si->dst_reg, si->src_reg,
8445                                       offsetof(struct sk_buff, sk));
8446                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
8447                                       bpf_target_off(struct sock_common,
8448                                                      skc_num, 2, target_size));
8449                 break;
8450
8451         case offsetof(struct __sk_buff, tstamp):
8452                 BUILD_BUG_ON(sizeof_field(struct sk_buff, tstamp) != 8);
8453
8454                 if (type == BPF_WRITE)
8455                         *insn++ = BPF_STX_MEM(BPF_DW,
8456                                               si->dst_reg, si->src_reg,
8457                                               bpf_target_off(struct sk_buff,
8458                                                              tstamp, 8,
8459                                                              target_size));
8460                 else
8461                         *insn++ = BPF_LDX_MEM(BPF_DW,
8462                                               si->dst_reg, si->src_reg,
8463                                               bpf_target_off(struct sk_buff,
8464                                                              tstamp, 8,
8465                                                              target_size));
8466                 break;
8467
8468         case offsetof(struct __sk_buff, gso_segs):
8469                 insn = bpf_convert_shinfo_access(si, insn);
8470                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs),
8471                                       si->dst_reg, si->dst_reg,
8472                                       bpf_target_off(struct skb_shared_info,
8473                                                      gso_segs, 2,
8474                                                      target_size));
8475                 break;
8476         case offsetof(struct __sk_buff, gso_size):
8477                 insn = bpf_convert_shinfo_access(si, insn);
8478                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_size),
8479                                       si->dst_reg, si->dst_reg,
8480                                       bpf_target_off(struct skb_shared_info,
8481                                                      gso_size, 2,
8482                                                      target_size));
8483                 break;
8484         case offsetof(struct __sk_buff, wire_len):
8485                 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, pkt_len) != 4);
8486
8487                 off = si->off;
8488                 off -= offsetof(struct __sk_buff, wire_len);
8489                 off += offsetof(struct sk_buff, cb);
8490                 off += offsetof(struct qdisc_skb_cb, pkt_len);
8491                 *target_size = 4;
8492                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off);
8493                 break;
8494
8495         case offsetof(struct __sk_buff, sk):
8496                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8497                                       si->dst_reg, si->src_reg,
8498                                       offsetof(struct sk_buff, sk));
8499                 break;
8500         }
8501
8502         return insn - insn_buf;
8503 }
8504
8505 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
8506                                 const struct bpf_insn *si,
8507                                 struct bpf_insn *insn_buf,
8508                                 struct bpf_prog *prog, u32 *target_size)
8509 {
8510         struct bpf_insn *insn = insn_buf;
8511         int off;
8512
8513         switch (si->off) {
8514         case offsetof(struct bpf_sock, bound_dev_if):
8515                 BUILD_BUG_ON(sizeof_field(struct sock, sk_bound_dev_if) != 4);
8516
8517                 if (type == BPF_WRITE)
8518                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
8519                                         offsetof(struct sock, sk_bound_dev_if));
8520                 else
8521                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8522                                       offsetof(struct sock, sk_bound_dev_if));
8523                 break;
8524
8525         case offsetof(struct bpf_sock, mark):
8526                 BUILD_BUG_ON(sizeof_field(struct sock, sk_mark) != 4);
8527
8528                 if (type == BPF_WRITE)
8529                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
8530                                         offsetof(struct sock, sk_mark));
8531                 else
8532                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8533                                       offsetof(struct sock, sk_mark));
8534                 break;
8535
8536         case offsetof(struct bpf_sock, priority):
8537                 BUILD_BUG_ON(sizeof_field(struct sock, sk_priority) != 4);
8538
8539                 if (type == BPF_WRITE)
8540                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
8541                                         offsetof(struct sock, sk_priority));
8542                 else
8543                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8544                                       offsetof(struct sock, sk_priority));
8545                 break;
8546
8547         case offsetof(struct bpf_sock, family):
8548                 *insn++ = BPF_LDX_MEM(
8549                         BPF_FIELD_SIZEOF(struct sock_common, skc_family),
8550                         si->dst_reg, si->src_reg,
8551                         bpf_target_off(struct sock_common,
8552                                        skc_family,
8553                                        sizeof_field(struct sock_common,
8554                                                     skc_family),
8555                                        target_size));
8556                 break;
8557
8558         case offsetof(struct bpf_sock, type):
8559                 *insn++ = BPF_LDX_MEM(
8560                         BPF_FIELD_SIZEOF(struct sock, sk_type),
8561                         si->dst_reg, si->src_reg,
8562                         bpf_target_off(struct sock, sk_type,
8563                                        sizeof_field(struct sock, sk_type),
8564                                        target_size));
8565                 break;
8566
8567         case offsetof(struct bpf_sock, protocol):
8568                 *insn++ = BPF_LDX_MEM(
8569                         BPF_FIELD_SIZEOF(struct sock, sk_protocol),
8570                         si->dst_reg, si->src_reg,
8571                         bpf_target_off(struct sock, sk_protocol,
8572                                        sizeof_field(struct sock, sk_protocol),
8573                                        target_size));
8574                 break;
8575
8576         case offsetof(struct bpf_sock, src_ip4):
8577                 *insn++ = BPF_LDX_MEM(
8578                         BPF_SIZE(si->code), si->dst_reg, si->src_reg,
8579                         bpf_target_off(struct sock_common, skc_rcv_saddr,
8580                                        sizeof_field(struct sock_common,
8581                                                     skc_rcv_saddr),
8582                                        target_size));
8583                 break;
8584
8585         case offsetof(struct bpf_sock, dst_ip4):
8586                 *insn++ = BPF_LDX_MEM(
8587                         BPF_SIZE(si->code), si->dst_reg, si->src_reg,
8588                         bpf_target_off(struct sock_common, skc_daddr,
8589                                        sizeof_field(struct sock_common,
8590                                                     skc_daddr),
8591                                        target_size));
8592                 break;
8593
8594         case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
8595 #if IS_ENABLED(CONFIG_IPV6)
8596                 off = si->off;
8597                 off -= offsetof(struct bpf_sock, src_ip6[0]);
8598                 *insn++ = BPF_LDX_MEM(
8599                         BPF_SIZE(si->code), si->dst_reg, si->src_reg,
8600                         bpf_target_off(
8601                                 struct sock_common,
8602                                 skc_v6_rcv_saddr.s6_addr32[0],
8603                                 sizeof_field(struct sock_common,
8604                                              skc_v6_rcv_saddr.s6_addr32[0]),
8605                                 target_size) + off);
8606 #else
8607                 (void)off;
8608                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
8609 #endif
8610                 break;
8611
8612         case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]):
8613 #if IS_ENABLED(CONFIG_IPV6)
8614                 off = si->off;
8615                 off -= offsetof(struct bpf_sock, dst_ip6[0]);
8616                 *insn++ = BPF_LDX_MEM(
8617                         BPF_SIZE(si->code), si->dst_reg, si->src_reg,
8618                         bpf_target_off(struct sock_common,
8619                                        skc_v6_daddr.s6_addr32[0],
8620                                        sizeof_field(struct sock_common,
8621                                                     skc_v6_daddr.s6_addr32[0]),
8622                                        target_size) + off);
8623 #else
8624                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
8625                 *target_size = 4;
8626 #endif
8627                 break;
8628
8629         case offsetof(struct bpf_sock, src_port):
8630                 *insn++ = BPF_LDX_MEM(
8631                         BPF_FIELD_SIZEOF(struct sock_common, skc_num),
8632                         si->dst_reg, si->src_reg,
8633                         bpf_target_off(struct sock_common, skc_num,
8634                                        sizeof_field(struct sock_common,
8635                                                     skc_num),
8636                                        target_size));
8637                 break;
8638
8639         case offsetof(struct bpf_sock, dst_port):
8640                 *insn++ = BPF_LDX_MEM(
8641                         BPF_FIELD_SIZEOF(struct sock_common, skc_dport),
8642                         si->dst_reg, si->src_reg,
8643                         bpf_target_off(struct sock_common, skc_dport,
8644                                        sizeof_field(struct sock_common,
8645                                                     skc_dport),
8646                                        target_size));
8647                 break;
8648
8649         case offsetof(struct bpf_sock, state):
8650                 *insn++ = BPF_LDX_MEM(
8651                         BPF_FIELD_SIZEOF(struct sock_common, skc_state),
8652                         si->dst_reg, si->src_reg,
8653                         bpf_target_off(struct sock_common, skc_state,
8654                                        sizeof_field(struct sock_common,
8655                                                     skc_state),
8656                                        target_size));
8657                 break;
8658         case offsetof(struct bpf_sock, rx_queue_mapping):
8659 #ifdef CONFIG_XPS
8660                 *insn++ = BPF_LDX_MEM(
8661                         BPF_FIELD_SIZEOF(struct sock, sk_rx_queue_mapping),
8662                         si->dst_reg, si->src_reg,
8663                         bpf_target_off(struct sock, sk_rx_queue_mapping,
8664                                        sizeof_field(struct sock,
8665                                                     sk_rx_queue_mapping),
8666                                        target_size));
8667                 *insn++ = BPF_JMP_IMM(BPF_JNE, si->dst_reg, NO_QUEUE_MAPPING,
8668                                       1);
8669                 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1);
8670 #else
8671                 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1);
8672                 *target_size = 2;
8673 #endif
8674                 break;
8675         }
8676
8677         return insn - insn_buf;
8678 }
8679
8680 static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type,
8681                                          const struct bpf_insn *si,
8682                                          struct bpf_insn *insn_buf,
8683                                          struct bpf_prog *prog, u32 *target_size)
8684 {
8685         struct bpf_insn *insn = insn_buf;
8686
8687         switch (si->off) {
8688         case offsetof(struct __sk_buff, ifindex):
8689                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
8690                                       si->dst_reg, si->src_reg,
8691                                       offsetof(struct sk_buff, dev));
8692                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8693                                       bpf_target_off(struct net_device, ifindex, 4,
8694                                                      target_size));
8695                 break;
8696         default:
8697                 return bpf_convert_ctx_access(type, si, insn_buf, prog,
8698                                               target_size);
8699         }
8700
8701         return insn - insn_buf;
8702 }
8703
8704 static u32 xdp_convert_ctx_access(enum bpf_access_type type,
8705                                   const struct bpf_insn *si,
8706                                   struct bpf_insn *insn_buf,
8707                                   struct bpf_prog *prog, u32 *target_size)
8708 {
8709         struct bpf_insn *insn = insn_buf;
8710
8711         switch (si->off) {
8712         case offsetof(struct xdp_md, data):
8713                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data),
8714                                       si->dst_reg, si->src_reg,
8715                                       offsetof(struct xdp_buff, data));
8716                 break;
8717         case offsetof(struct xdp_md, data_meta):
8718                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta),
8719                                       si->dst_reg, si->src_reg,
8720                                       offsetof(struct xdp_buff, data_meta));
8721                 break;
8722         case offsetof(struct xdp_md, data_end):
8723                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end),
8724                                       si->dst_reg, si->src_reg,
8725                                       offsetof(struct xdp_buff, data_end));
8726                 break;
8727         case offsetof(struct xdp_md, ingress_ifindex):
8728                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
8729                                       si->dst_reg, si->src_reg,
8730                                       offsetof(struct xdp_buff, rxq));
8731                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev),
8732                                       si->dst_reg, si->dst_reg,
8733                                       offsetof(struct xdp_rxq_info, dev));
8734                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8735                                       offsetof(struct net_device, ifindex));
8736                 break;
8737         case offsetof(struct xdp_md, rx_queue_index):
8738                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
8739                                       si->dst_reg, si->src_reg,
8740                                       offsetof(struct xdp_buff, rxq));
8741                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8742                                       offsetof(struct xdp_rxq_info,
8743                                                queue_index));
8744                 break;
8745         case offsetof(struct xdp_md, egress_ifindex):
8746                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, txq),
8747                                       si->dst_reg, si->src_reg,
8748                                       offsetof(struct xdp_buff, txq));
8749                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_txq_info, dev),
8750                                       si->dst_reg, si->dst_reg,
8751                                       offsetof(struct xdp_txq_info, dev));
8752                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8753                                       offsetof(struct net_device, ifindex));
8754                 break;
8755         }
8756
8757         return insn - insn_buf;
8758 }
8759
8760 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of
8761  * context Structure, F is Field in context structure that contains a pointer
8762  * to Nested Structure of type NS that has the field NF.
8763  *
8764  * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make
8765  * sure that SIZE is not greater than actual size of S.F.NF.
8766  *
8767  * If offset OFF is provided, the load happens from that offset relative to
8768  * offset of NF.
8769  */
8770 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF)          \
8771         do {                                                                   \
8772                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg,     \
8773                                       si->src_reg, offsetof(S, F));            \
8774                 *insn++ = BPF_LDX_MEM(                                         \
8775                         SIZE, si->dst_reg, si->dst_reg,                        \
8776                         bpf_target_off(NS, NF, sizeof_field(NS, NF),           \
8777                                        target_size)                            \
8778                                 + OFF);                                        \
8779         } while (0)
8780
8781 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF)                              \
8782         SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF,                     \
8783                                              BPF_FIELD_SIZEOF(NS, NF), 0)
8784
8785 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to
8786  * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation.
8787  *
8788  * In addition it uses Temporary Field TF (member of struct S) as the 3rd
8789  * "register" since two registers available in convert_ctx_access are not
8790  * enough: we can't override neither SRC, since it contains value to store, nor
8791  * DST since it contains pointer to context that may be used by later
8792  * instructions. But we need a temporary place to save pointer to nested
8793  * structure whose field we want to store to.
8794  */
8795 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF)          \
8796         do {                                                                   \
8797                 int tmp_reg = BPF_REG_9;                                       \
8798                 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg)          \
8799                         --tmp_reg;                                             \
8800                 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg)          \
8801                         --tmp_reg;                                             \
8802                 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg,            \
8803                                       offsetof(S, TF));                        \
8804                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg,         \
8805                                       si->dst_reg, offsetof(S, F));            \
8806                 *insn++ = BPF_STX_MEM(SIZE, tmp_reg, si->src_reg,              \
8807                         bpf_target_off(NS, NF, sizeof_field(NS, NF),           \
8808                                        target_size)                            \
8809                                 + OFF);                                        \
8810                 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg,            \
8811                                       offsetof(S, TF));                        \
8812         } while (0)
8813
8814 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \
8815                                                       TF)                      \
8816         do {                                                                   \
8817                 if (type == BPF_WRITE) {                                       \
8818                         SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE,   \
8819                                                          OFF, TF);             \
8820                 } else {                                                       \
8821                         SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(                  \
8822                                 S, NS, F, NF, SIZE, OFF);  \
8823                 }                                                              \
8824         } while (0)
8825
8826 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF)                 \
8827         SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(                         \
8828                 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF)
8829
8830 static u32 sock_addr_convert_ctx_access(enum bpf_access_type type,
8831                                         const struct bpf_insn *si,
8832                                         struct bpf_insn *insn_buf,
8833                                         struct bpf_prog *prog, u32 *target_size)
8834 {
8835         int off, port_size = sizeof_field(struct sockaddr_in6, sin6_port);
8836         struct bpf_insn *insn = insn_buf;
8837
8838         switch (si->off) {
8839         case offsetof(struct bpf_sock_addr, user_family):
8840                 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
8841                                             struct sockaddr, uaddr, sa_family);
8842                 break;
8843
8844         case offsetof(struct bpf_sock_addr, user_ip4):
8845                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
8846                         struct bpf_sock_addr_kern, struct sockaddr_in, uaddr,
8847                         sin_addr, BPF_SIZE(si->code), 0, tmp_reg);
8848                 break;
8849
8850         case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
8851                 off = si->off;
8852                 off -= offsetof(struct bpf_sock_addr, user_ip6[0]);
8853                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
8854                         struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr,
8855                         sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off,
8856                         tmp_reg);
8857                 break;
8858
8859         case offsetof(struct bpf_sock_addr, user_port):
8860                 /* To get port we need to know sa_family first and then treat
8861                  * sockaddr as either sockaddr_in or sockaddr_in6.
8862                  * Though we can simplify since port field has same offset and
8863                  * size in both structures.
8864                  * Here we check this invariant and use just one of the
8865                  * structures if it's true.
8866                  */
8867                 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) !=
8868                              offsetof(struct sockaddr_in6, sin6_port));
8869                 BUILD_BUG_ON(sizeof_field(struct sockaddr_in, sin_port) !=
8870                              sizeof_field(struct sockaddr_in6, sin6_port));
8871                 /* Account for sin6_port being smaller than user_port. */
8872                 port_size = min(port_size, BPF_LDST_BYTES(si));
8873                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
8874                         struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr,
8875                         sin6_port, bytes_to_bpf_size(port_size), 0, tmp_reg);
8876                 break;
8877
8878         case offsetof(struct bpf_sock_addr, family):
8879                 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
8880                                             struct sock, sk, sk_family);
8881                 break;
8882
8883         case offsetof(struct bpf_sock_addr, type):
8884                 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
8885                                             struct sock, sk, sk_type);
8886                 break;
8887
8888         case offsetof(struct bpf_sock_addr, protocol):
8889                 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
8890                                             struct sock, sk, sk_protocol);
8891                 break;
8892
8893         case offsetof(struct bpf_sock_addr, msg_src_ip4):
8894                 /* Treat t_ctx as struct in_addr for msg_src_ip4. */
8895                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
8896                         struct bpf_sock_addr_kern, struct in_addr, t_ctx,
8897                         s_addr, BPF_SIZE(si->code), 0, tmp_reg);
8898                 break;
8899
8900         case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
8901                                 msg_src_ip6[3]):
8902                 off = si->off;
8903                 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]);
8904                 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */
8905                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
8906                         struct bpf_sock_addr_kern, struct in6_addr, t_ctx,
8907                         s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg);
8908                 break;
8909         case offsetof(struct bpf_sock_addr, sk):
8910                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk),
8911                                       si->dst_reg, si->src_reg,
8912                                       offsetof(struct bpf_sock_addr_kern, sk));
8913                 break;
8914         }
8915
8916         return insn - insn_buf;
8917 }
8918
8919 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
8920                                        const struct bpf_insn *si,
8921                                        struct bpf_insn *insn_buf,
8922                                        struct bpf_prog *prog,
8923                                        u32 *target_size)
8924 {
8925         struct bpf_insn *insn = insn_buf;
8926         int off;
8927
8928 /* Helper macro for adding read access to tcp_sock or sock fields. */
8929 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ)                         \
8930         do {                                                                  \
8931                 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 2;     \
8932                 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) >                   \
8933                              sizeof_field(struct bpf_sock_ops, BPF_FIELD));   \
8934                 if (si->dst_reg == reg || si->src_reg == reg)                 \
8935                         reg--;                                                \
8936                 if (si->dst_reg == reg || si->src_reg == reg)                 \
8937                         reg--;                                                \
8938                 if (si->dst_reg == si->src_reg) {                             \
8939                         *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg,       \
8940                                           offsetof(struct bpf_sock_ops_kern,  \
8941                                           temp));                             \
8942                         fullsock_reg = reg;                                   \
8943                         jmp += 2;                                             \
8944                 }                                                             \
8945                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
8946                                                 struct bpf_sock_ops_kern,     \
8947                                                 is_fullsock),                 \
8948                                       fullsock_reg, si->src_reg,              \
8949                                       offsetof(struct bpf_sock_ops_kern,      \
8950                                                is_fullsock));                 \
8951                 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp);         \
8952                 if (si->dst_reg == si->src_reg)                               \
8953                         *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg,       \
8954                                       offsetof(struct bpf_sock_ops_kern,      \
8955                                       temp));                                 \
8956                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
8957                                                 struct bpf_sock_ops_kern, sk),\
8958                                       si->dst_reg, si->src_reg,               \
8959                                       offsetof(struct bpf_sock_ops_kern, sk));\
8960                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ,                   \
8961                                                        OBJ_FIELD),            \
8962                                       si->dst_reg, si->dst_reg,               \
8963                                       offsetof(OBJ, OBJ_FIELD));              \
8964                 if (si->dst_reg == si->src_reg) {                             \
8965                         *insn++ = BPF_JMP_A(1);                               \
8966                         *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg,       \
8967                                       offsetof(struct bpf_sock_ops_kern,      \
8968                                       temp));                                 \
8969                 }                                                             \
8970         } while (0)
8971
8972 #define SOCK_OPS_GET_SK()                                                             \
8973         do {                                                                  \
8974                 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 1;     \
8975                 if (si->dst_reg == reg || si->src_reg == reg)                 \
8976                         reg--;                                                \
8977                 if (si->dst_reg == reg || si->src_reg == reg)                 \
8978                         reg--;                                                \
8979                 if (si->dst_reg == si->src_reg) {                             \
8980                         *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg,       \
8981                                           offsetof(struct bpf_sock_ops_kern,  \
8982                                           temp));                             \
8983                         fullsock_reg = reg;                                   \
8984                         jmp += 2;                                             \
8985                 }                                                             \
8986                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
8987                                                 struct bpf_sock_ops_kern,     \
8988                                                 is_fullsock),                 \
8989                                       fullsock_reg, si->src_reg,              \
8990                                       offsetof(struct bpf_sock_ops_kern,      \
8991                                                is_fullsock));                 \
8992                 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp);         \
8993                 if (si->dst_reg == si->src_reg)                               \
8994                         *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg,       \
8995                                       offsetof(struct bpf_sock_ops_kern,      \
8996                                       temp));                                 \
8997                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
8998                                                 struct bpf_sock_ops_kern, sk),\
8999                                       si->dst_reg, si->src_reg,               \
9000                                       offsetof(struct bpf_sock_ops_kern, sk));\
9001                 if (si->dst_reg == si->src_reg) {                             \
9002                         *insn++ = BPF_JMP_A(1);                               \
9003                         *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg,       \
9004                                       offsetof(struct bpf_sock_ops_kern,      \
9005                                       temp));                                 \
9006                 }                                                             \
9007         } while (0)
9008
9009 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \
9010                 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock)
9011
9012 /* Helper macro for adding write access to tcp_sock or sock fields.
9013  * The macro is called with two registers, dst_reg which contains a pointer
9014  * to ctx (context) and src_reg which contains the value that should be
9015  * stored. However, we need an additional register since we cannot overwrite
9016  * dst_reg because it may be used later in the program.
9017  * Instead we "borrow" one of the other register. We first save its value
9018  * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore
9019  * it at the end of the macro.
9020  */
9021 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ)                         \
9022         do {                                                                  \
9023                 int reg = BPF_REG_9;                                          \
9024                 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) >                   \
9025                              sizeof_field(struct bpf_sock_ops, BPF_FIELD));   \
9026                 if (si->dst_reg == reg || si->src_reg == reg)                 \
9027                         reg--;                                                \
9028                 if (si->dst_reg == reg || si->src_reg == reg)                 \
9029                         reg--;                                                \
9030                 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg,               \
9031                                       offsetof(struct bpf_sock_ops_kern,      \
9032                                                temp));                        \
9033                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
9034                                                 struct bpf_sock_ops_kern,     \
9035                                                 is_fullsock),                 \
9036                                       reg, si->dst_reg,                       \
9037                                       offsetof(struct bpf_sock_ops_kern,      \
9038                                                is_fullsock));                 \
9039                 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2);                    \
9040                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
9041                                                 struct bpf_sock_ops_kern, sk),\
9042                                       reg, si->dst_reg,                       \
9043                                       offsetof(struct bpf_sock_ops_kern, sk));\
9044                 *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD),       \
9045                                       reg, si->src_reg,                       \
9046                                       offsetof(OBJ, OBJ_FIELD));              \
9047                 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg,               \
9048                                       offsetof(struct bpf_sock_ops_kern,      \
9049                                                temp));                        \
9050         } while (0)
9051
9052 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE)            \
9053         do {                                                                  \
9054                 if (TYPE == BPF_WRITE)                                        \
9055                         SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ);        \
9056                 else                                                          \
9057                         SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ);        \
9058         } while (0)
9059
9060         if (insn > insn_buf)
9061                 return insn - insn_buf;
9062
9063         switch (si->off) {
9064         case offsetof(struct bpf_sock_ops, op):
9065                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
9066                                                        op),
9067                                       si->dst_reg, si->src_reg,
9068                                       offsetof(struct bpf_sock_ops_kern, op));
9069                 break;
9070
9071         case offsetof(struct bpf_sock_ops, replylong[0]) ...
9072              offsetof(struct bpf_sock_ops, replylong[3]):
9073                 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, reply) !=
9074                              sizeof_field(struct bpf_sock_ops_kern, reply));
9075                 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, replylong) !=
9076                              sizeof_field(struct bpf_sock_ops_kern, replylong));
9077                 off = si->off;
9078                 off -= offsetof(struct bpf_sock_ops, replylong[0]);
9079                 off += offsetof(struct bpf_sock_ops_kern, replylong[0]);
9080                 if (type == BPF_WRITE)
9081                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
9082                                               off);
9083                 else
9084                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
9085                                               off);
9086                 break;
9087
9088         case offsetof(struct bpf_sock_ops, family):
9089                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2);
9090
9091                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9092                                               struct bpf_sock_ops_kern, sk),
9093                                       si->dst_reg, si->src_reg,
9094                                       offsetof(struct bpf_sock_ops_kern, sk));
9095                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9096                                       offsetof(struct sock_common, skc_family));
9097                 break;
9098
9099         case offsetof(struct bpf_sock_ops, remote_ip4):
9100                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4);
9101
9102                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9103                                                 struct bpf_sock_ops_kern, sk),
9104                                       si->dst_reg, si->src_reg,
9105                                       offsetof(struct bpf_sock_ops_kern, sk));
9106                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9107                                       offsetof(struct sock_common, skc_daddr));
9108                 break;
9109
9110         case offsetof(struct bpf_sock_ops, local_ip4):
9111                 BUILD_BUG_ON(sizeof_field(struct sock_common,
9112                                           skc_rcv_saddr) != 4);
9113
9114                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9115                                               struct bpf_sock_ops_kern, sk),
9116                                       si->dst_reg, si->src_reg,
9117                                       offsetof(struct bpf_sock_ops_kern, sk));
9118                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9119                                       offsetof(struct sock_common,
9120                                                skc_rcv_saddr));
9121                 break;
9122
9123         case offsetof(struct bpf_sock_ops, remote_ip6[0]) ...
9124              offsetof(struct bpf_sock_ops, remote_ip6[3]):
9125 #if IS_ENABLED(CONFIG_IPV6)
9126                 BUILD_BUG_ON(sizeof_field(struct sock_common,
9127                                           skc_v6_daddr.s6_addr32[0]) != 4);
9128
9129                 off = si->off;
9130                 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]);
9131                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9132                                                 struct bpf_sock_ops_kern, sk),
9133                                       si->dst_reg, si->src_reg,
9134                                       offsetof(struct bpf_sock_ops_kern, sk));
9135                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9136                                       offsetof(struct sock_common,
9137                                                skc_v6_daddr.s6_addr32[0]) +
9138                                       off);
9139 #else
9140                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
9141 #endif
9142                 break;
9143
9144         case offsetof(struct bpf_sock_ops, local_ip6[0]) ...
9145              offsetof(struct bpf_sock_ops, local_ip6[3]):
9146 #if IS_ENABLED(CONFIG_IPV6)
9147                 BUILD_BUG_ON(sizeof_field(struct sock_common,
9148                                           skc_v6_rcv_saddr.s6_addr32[0]) != 4);
9149
9150                 off = si->off;
9151                 off -= offsetof(struct bpf_sock_ops, local_ip6[0]);
9152                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9153                                                 struct bpf_sock_ops_kern, sk),
9154                                       si->dst_reg, si->src_reg,
9155                                       offsetof(struct bpf_sock_ops_kern, sk));
9156                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9157                                       offsetof(struct sock_common,
9158                                                skc_v6_rcv_saddr.s6_addr32[0]) +
9159                                       off);
9160 #else
9161                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
9162 #endif
9163                 break;
9164
9165         case offsetof(struct bpf_sock_ops, remote_port):
9166                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2);
9167
9168                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9169                                                 struct bpf_sock_ops_kern, sk),
9170                                       si->dst_reg, si->src_reg,
9171                                       offsetof(struct bpf_sock_ops_kern, sk));
9172                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9173                                       offsetof(struct sock_common, skc_dport));
9174 #ifndef __BIG_ENDIAN_BITFIELD
9175                 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
9176 #endif
9177                 break;
9178
9179         case offsetof(struct bpf_sock_ops, local_port):
9180                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2);
9181
9182                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9183                                                 struct bpf_sock_ops_kern, sk),
9184                                       si->dst_reg, si->src_reg,
9185                                       offsetof(struct bpf_sock_ops_kern, sk));
9186                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9187                                       offsetof(struct sock_common, skc_num));
9188                 break;
9189
9190         case offsetof(struct bpf_sock_ops, is_fullsock):
9191                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9192                                                 struct bpf_sock_ops_kern,
9193                                                 is_fullsock),
9194                                       si->dst_reg, si->src_reg,
9195                                       offsetof(struct bpf_sock_ops_kern,
9196                                                is_fullsock));
9197                 break;
9198
9199         case offsetof(struct bpf_sock_ops, state):
9200                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_state) != 1);
9201
9202                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9203                                                 struct bpf_sock_ops_kern, sk),
9204                                       si->dst_reg, si->src_reg,
9205                                       offsetof(struct bpf_sock_ops_kern, sk));
9206                 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg,
9207                                       offsetof(struct sock_common, skc_state));
9208                 break;
9209
9210         case offsetof(struct bpf_sock_ops, rtt_min):
9211                 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) !=
9212                              sizeof(struct minmax));
9213                 BUILD_BUG_ON(sizeof(struct minmax) <
9214                              sizeof(struct minmax_sample));
9215
9216                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9217                                                 struct bpf_sock_ops_kern, sk),
9218                                       si->dst_reg, si->src_reg,
9219                                       offsetof(struct bpf_sock_ops_kern, sk));
9220                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9221                                       offsetof(struct tcp_sock, rtt_min) +
9222                                       sizeof_field(struct minmax_sample, t));
9223                 break;
9224
9225         case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags):
9226                 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags,
9227                                    struct tcp_sock);
9228                 break;
9229
9230         case offsetof(struct bpf_sock_ops, sk_txhash):
9231                 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash,
9232                                           struct sock, type);
9233                 break;
9234         case offsetof(struct bpf_sock_ops, snd_cwnd):
9235                 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd);
9236                 break;
9237         case offsetof(struct bpf_sock_ops, srtt_us):
9238                 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us);
9239                 break;
9240         case offsetof(struct bpf_sock_ops, snd_ssthresh):
9241                 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh);
9242                 break;
9243         case offsetof(struct bpf_sock_ops, rcv_nxt):
9244                 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt);
9245                 break;
9246         case offsetof(struct bpf_sock_ops, snd_nxt):
9247                 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt);
9248                 break;
9249         case offsetof(struct bpf_sock_ops, snd_una):
9250                 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una);
9251                 break;
9252         case offsetof(struct bpf_sock_ops, mss_cache):
9253                 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache);
9254                 break;
9255         case offsetof(struct bpf_sock_ops, ecn_flags):
9256                 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags);
9257                 break;
9258         case offsetof(struct bpf_sock_ops, rate_delivered):
9259                 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered);
9260                 break;
9261         case offsetof(struct bpf_sock_ops, rate_interval_us):
9262                 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us);
9263                 break;
9264         case offsetof(struct bpf_sock_ops, packets_out):
9265                 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out);
9266                 break;
9267         case offsetof(struct bpf_sock_ops, retrans_out):
9268                 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out);
9269                 break;
9270         case offsetof(struct bpf_sock_ops, total_retrans):
9271                 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans);
9272                 break;
9273         case offsetof(struct bpf_sock_ops, segs_in):
9274                 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in);
9275                 break;
9276         case offsetof(struct bpf_sock_ops, data_segs_in):
9277                 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in);
9278                 break;
9279         case offsetof(struct bpf_sock_ops, segs_out):
9280                 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out);
9281                 break;
9282         case offsetof(struct bpf_sock_ops, data_segs_out):
9283                 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out);
9284                 break;
9285         case offsetof(struct bpf_sock_ops, lost_out):
9286                 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out);
9287                 break;
9288         case offsetof(struct bpf_sock_ops, sacked_out):
9289                 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out);
9290                 break;
9291         case offsetof(struct bpf_sock_ops, bytes_received):
9292                 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received);
9293                 break;
9294         case offsetof(struct bpf_sock_ops, bytes_acked):
9295                 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked);
9296                 break;
9297         case offsetof(struct bpf_sock_ops, sk):
9298                 SOCK_OPS_GET_SK();
9299                 break;
9300         case offsetof(struct bpf_sock_ops, skb_data_end):
9301                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
9302                                                        skb_data_end),
9303                                       si->dst_reg, si->src_reg,
9304                                       offsetof(struct bpf_sock_ops_kern,
9305                                                skb_data_end));
9306                 break;
9307         case offsetof(struct bpf_sock_ops, skb_data):
9308                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
9309                                                        skb),
9310                                       si->dst_reg, si->src_reg,
9311                                       offsetof(struct bpf_sock_ops_kern,
9312                                                skb));
9313                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
9314                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
9315                                       si->dst_reg, si->dst_reg,
9316                                       offsetof(struct sk_buff, data));
9317                 break;
9318         case offsetof(struct bpf_sock_ops, skb_len):
9319                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
9320                                                        skb),
9321                                       si->dst_reg, si->src_reg,
9322                                       offsetof(struct bpf_sock_ops_kern,
9323                                                skb));
9324                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
9325                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len),
9326                                       si->dst_reg, si->dst_reg,
9327                                       offsetof(struct sk_buff, len));
9328                 break;
9329         case offsetof(struct bpf_sock_ops, skb_tcp_flags):
9330                 off = offsetof(struct sk_buff, cb);
9331                 off += offsetof(struct tcp_skb_cb, tcp_flags);
9332                 *target_size = sizeof_field(struct tcp_skb_cb, tcp_flags);
9333                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
9334                                                        skb),
9335                                       si->dst_reg, si->src_reg,
9336                                       offsetof(struct bpf_sock_ops_kern,
9337                                                skb));
9338                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
9339                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_skb_cb,
9340                                                        tcp_flags),
9341                                       si->dst_reg, si->dst_reg, off);
9342                 break;
9343         }
9344         return insn - insn_buf;
9345 }
9346
9347 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type,
9348                                      const struct bpf_insn *si,
9349                                      struct bpf_insn *insn_buf,
9350                                      struct bpf_prog *prog, u32 *target_size)
9351 {
9352         struct bpf_insn *insn = insn_buf;
9353         int off;
9354
9355         switch (si->off) {
9356         case offsetof(struct __sk_buff, data_end):
9357                 off  = si->off;
9358                 off -= offsetof(struct __sk_buff, data_end);
9359                 off += offsetof(struct sk_buff, cb);
9360                 off += offsetof(struct tcp_skb_cb, bpf.data_end);
9361                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
9362                                       si->src_reg, off);
9363                 break;
9364         default:
9365                 return bpf_convert_ctx_access(type, si, insn_buf, prog,
9366                                               target_size);
9367         }
9368
9369         return insn - insn_buf;
9370 }
9371
9372 static u32 sk_msg_convert_ctx_access(enum bpf_access_type type,
9373                                      const struct bpf_insn *si,
9374                                      struct bpf_insn *insn_buf,
9375                                      struct bpf_prog *prog, u32 *target_size)
9376 {
9377         struct bpf_insn *insn = insn_buf;
9378 #if IS_ENABLED(CONFIG_IPV6)
9379         int off;
9380 #endif
9381
9382         /* convert ctx uses the fact sg element is first in struct */
9383         BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0);
9384
9385         switch (si->off) {
9386         case offsetof(struct sk_msg_md, data):
9387                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data),
9388                                       si->dst_reg, si->src_reg,
9389                                       offsetof(struct sk_msg, data));
9390                 break;
9391         case offsetof(struct sk_msg_md, data_end):
9392                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end),
9393                                       si->dst_reg, si->src_reg,
9394                                       offsetof(struct sk_msg, data_end));
9395                 break;
9396         case offsetof(struct sk_msg_md, family):
9397                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2);
9398
9399                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9400                                               struct sk_msg, sk),
9401                                       si->dst_reg, si->src_reg,
9402                                       offsetof(struct sk_msg, sk));
9403                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9404                                       offsetof(struct sock_common, skc_family));
9405                 break;
9406
9407         case offsetof(struct sk_msg_md, remote_ip4):
9408                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4);
9409
9410                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9411                                                 struct sk_msg, sk),
9412                                       si->dst_reg, si->src_reg,
9413                                       offsetof(struct sk_msg, sk));
9414                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9415                                       offsetof(struct sock_common, skc_daddr));
9416                 break;
9417
9418         case offsetof(struct sk_msg_md, local_ip4):
9419                 BUILD_BUG_ON(sizeof_field(struct sock_common,
9420                                           skc_rcv_saddr) != 4);
9421
9422                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9423                                               struct sk_msg, sk),
9424                                       si->dst_reg, si->src_reg,
9425                                       offsetof(struct sk_msg, sk));
9426                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9427                                       offsetof(struct sock_common,
9428                                                skc_rcv_saddr));
9429                 break;
9430
9431         case offsetof(struct sk_msg_md, remote_ip6[0]) ...
9432              offsetof(struct sk_msg_md, remote_ip6[3]):
9433 #if IS_ENABLED(CONFIG_IPV6)
9434                 BUILD_BUG_ON(sizeof_field(struct sock_common,
9435                                           skc_v6_daddr.s6_addr32[0]) != 4);
9436
9437                 off = si->off;
9438                 off -= offsetof(struct sk_msg_md, remote_ip6[0]);
9439                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9440                                                 struct sk_msg, sk),
9441                                       si->dst_reg, si->src_reg,
9442                                       offsetof(struct sk_msg, sk));
9443                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9444                                       offsetof(struct sock_common,
9445                                                skc_v6_daddr.s6_addr32[0]) +
9446                                       off);
9447 #else
9448                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
9449 #endif
9450                 break;
9451
9452         case offsetof(struct sk_msg_md, local_ip6[0]) ...
9453              offsetof(struct sk_msg_md, local_ip6[3]):
9454 #if IS_ENABLED(CONFIG_IPV6)
9455                 BUILD_BUG_ON(sizeof_field(struct sock_common,
9456                                           skc_v6_rcv_saddr.s6_addr32[0]) != 4);
9457
9458                 off = si->off;
9459                 off -= offsetof(struct sk_msg_md, local_ip6[0]);
9460                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9461                                                 struct sk_msg, sk),
9462                                       si->dst_reg, si->src_reg,
9463                                       offsetof(struct sk_msg, sk));
9464                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9465                                       offsetof(struct sock_common,
9466                                                skc_v6_rcv_saddr.s6_addr32[0]) +
9467                                       off);
9468 #else
9469                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
9470 #endif
9471                 break;
9472
9473         case offsetof(struct sk_msg_md, remote_port):
9474                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2);
9475
9476                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9477                                                 struct sk_msg, sk),
9478                                       si->dst_reg, si->src_reg,
9479                                       offsetof(struct sk_msg, sk));
9480                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9481                                       offsetof(struct sock_common, skc_dport));
9482 #ifndef __BIG_ENDIAN_BITFIELD
9483                 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
9484 #endif
9485                 break;
9486
9487         case offsetof(struct sk_msg_md, local_port):
9488                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2);
9489
9490                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9491                                                 struct sk_msg, sk),
9492                                       si->dst_reg, si->src_reg,
9493                                       offsetof(struct sk_msg, sk));
9494                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9495                                       offsetof(struct sock_common, skc_num));
9496                 break;
9497
9498         case offsetof(struct sk_msg_md, size):
9499                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size),
9500                                       si->dst_reg, si->src_reg,
9501                                       offsetof(struct sk_msg_sg, size));
9502                 break;
9503
9504         case offsetof(struct sk_msg_md, sk):
9505                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, sk),
9506                                       si->dst_reg, si->src_reg,
9507                                       offsetof(struct sk_msg, sk));
9508                 break;
9509         }
9510
9511         return insn - insn_buf;
9512 }
9513
9514 const struct bpf_verifier_ops sk_filter_verifier_ops = {
9515         .get_func_proto         = sk_filter_func_proto,
9516         .is_valid_access        = sk_filter_is_valid_access,
9517         .convert_ctx_access     = bpf_convert_ctx_access,
9518         .gen_ld_abs             = bpf_gen_ld_abs,
9519 };
9520
9521 const struct bpf_prog_ops sk_filter_prog_ops = {
9522         .test_run               = bpf_prog_test_run_skb,
9523 };
9524
9525 const struct bpf_verifier_ops tc_cls_act_verifier_ops = {
9526         .get_func_proto         = tc_cls_act_func_proto,
9527         .is_valid_access        = tc_cls_act_is_valid_access,
9528         .convert_ctx_access     = tc_cls_act_convert_ctx_access,
9529         .gen_prologue           = tc_cls_act_prologue,
9530         .gen_ld_abs             = bpf_gen_ld_abs,
9531 };
9532
9533 const struct bpf_prog_ops tc_cls_act_prog_ops = {
9534         .test_run               = bpf_prog_test_run_skb,
9535 };
9536
9537 const struct bpf_verifier_ops xdp_verifier_ops = {
9538         .get_func_proto         = xdp_func_proto,
9539         .is_valid_access        = xdp_is_valid_access,
9540         .convert_ctx_access     = xdp_convert_ctx_access,
9541         .gen_prologue           = bpf_noop_prologue,
9542 };
9543
9544 const struct bpf_prog_ops xdp_prog_ops = {
9545         .test_run               = bpf_prog_test_run_xdp,
9546 };
9547
9548 const struct bpf_verifier_ops cg_skb_verifier_ops = {
9549         .get_func_proto         = cg_skb_func_proto,
9550         .is_valid_access        = cg_skb_is_valid_access,
9551         .convert_ctx_access     = bpf_convert_ctx_access,
9552 };
9553
9554 const struct bpf_prog_ops cg_skb_prog_ops = {
9555         .test_run               = bpf_prog_test_run_skb,
9556 };
9557
9558 const struct bpf_verifier_ops lwt_in_verifier_ops = {
9559         .get_func_proto         = lwt_in_func_proto,
9560         .is_valid_access        = lwt_is_valid_access,
9561         .convert_ctx_access     = bpf_convert_ctx_access,
9562 };
9563
9564 const struct bpf_prog_ops lwt_in_prog_ops = {
9565         .test_run               = bpf_prog_test_run_skb,
9566 };
9567
9568 const struct bpf_verifier_ops lwt_out_verifier_ops = {
9569         .get_func_proto         = lwt_out_func_proto,
9570         .is_valid_access        = lwt_is_valid_access,
9571         .convert_ctx_access     = bpf_convert_ctx_access,
9572 };
9573
9574 const struct bpf_prog_ops lwt_out_prog_ops = {
9575         .test_run               = bpf_prog_test_run_skb,
9576 };
9577
9578 const struct bpf_verifier_ops lwt_xmit_verifier_ops = {
9579         .get_func_proto         = lwt_xmit_func_proto,
9580         .is_valid_access        = lwt_is_valid_access,
9581         .convert_ctx_access     = bpf_convert_ctx_access,
9582         .gen_prologue           = tc_cls_act_prologue,
9583 };
9584
9585 const struct bpf_prog_ops lwt_xmit_prog_ops = {
9586         .test_run               = bpf_prog_test_run_skb,
9587 };
9588
9589 const struct bpf_verifier_ops lwt_seg6local_verifier_ops = {
9590         .get_func_proto         = lwt_seg6local_func_proto,
9591         .is_valid_access        = lwt_is_valid_access,
9592         .convert_ctx_access     = bpf_convert_ctx_access,
9593 };
9594
9595 const struct bpf_prog_ops lwt_seg6local_prog_ops = {
9596         .test_run               = bpf_prog_test_run_skb,
9597 };
9598
9599 const struct bpf_verifier_ops cg_sock_verifier_ops = {
9600         .get_func_proto         = sock_filter_func_proto,
9601         .is_valid_access        = sock_filter_is_valid_access,
9602         .convert_ctx_access     = bpf_sock_convert_ctx_access,
9603 };
9604
9605 const struct bpf_prog_ops cg_sock_prog_ops = {
9606 };
9607
9608 const struct bpf_verifier_ops cg_sock_addr_verifier_ops = {
9609         .get_func_proto         = sock_addr_func_proto,
9610         .is_valid_access        = sock_addr_is_valid_access,
9611         .convert_ctx_access     = sock_addr_convert_ctx_access,
9612 };
9613
9614 const struct bpf_prog_ops cg_sock_addr_prog_ops = {
9615 };
9616
9617 const struct bpf_verifier_ops sock_ops_verifier_ops = {
9618         .get_func_proto         = sock_ops_func_proto,
9619         .is_valid_access        = sock_ops_is_valid_access,
9620         .convert_ctx_access     = sock_ops_convert_ctx_access,
9621 };
9622
9623 const struct bpf_prog_ops sock_ops_prog_ops = {
9624 };
9625
9626 const struct bpf_verifier_ops sk_skb_verifier_ops = {
9627         .get_func_proto         = sk_skb_func_proto,
9628         .is_valid_access        = sk_skb_is_valid_access,
9629         .convert_ctx_access     = sk_skb_convert_ctx_access,
9630         .gen_prologue           = sk_skb_prologue,
9631 };
9632
9633 const struct bpf_prog_ops sk_skb_prog_ops = {
9634 };
9635
9636 const struct bpf_verifier_ops sk_msg_verifier_ops = {
9637         .get_func_proto         = sk_msg_func_proto,
9638         .is_valid_access        = sk_msg_is_valid_access,
9639         .convert_ctx_access     = sk_msg_convert_ctx_access,
9640         .gen_prologue           = bpf_noop_prologue,
9641 };
9642
9643 const struct bpf_prog_ops sk_msg_prog_ops = {
9644 };
9645
9646 const struct bpf_verifier_ops flow_dissector_verifier_ops = {
9647         .get_func_proto         = flow_dissector_func_proto,
9648         .is_valid_access        = flow_dissector_is_valid_access,
9649         .convert_ctx_access     = flow_dissector_convert_ctx_access,
9650 };
9651
9652 const struct bpf_prog_ops flow_dissector_prog_ops = {
9653         .test_run               = bpf_prog_test_run_flow_dissector,
9654 };
9655
9656 int sk_detach_filter(struct sock *sk)
9657 {
9658         int ret = -ENOENT;
9659         struct sk_filter *filter;
9660
9661         if (sock_flag(sk, SOCK_FILTER_LOCKED))
9662                 return -EPERM;
9663
9664         filter = rcu_dereference_protected(sk->sk_filter,
9665                                            lockdep_sock_is_held(sk));
9666         if (filter) {
9667                 RCU_INIT_POINTER(sk->sk_filter, NULL);
9668                 sk_filter_uncharge(sk, filter);
9669                 ret = 0;
9670         }
9671
9672         return ret;
9673 }
9674 EXPORT_SYMBOL_GPL(sk_detach_filter);
9675
9676 int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf,
9677                   unsigned int len)
9678 {
9679         struct sock_fprog_kern *fprog;
9680         struct sk_filter *filter;
9681         int ret = 0;
9682
9683         lock_sock(sk);
9684         filter = rcu_dereference_protected(sk->sk_filter,
9685                                            lockdep_sock_is_held(sk));
9686         if (!filter)
9687                 goto out;
9688
9689         /* We're copying the filter that has been originally attached,
9690          * so no conversion/decode needed anymore. eBPF programs that
9691          * have no original program cannot be dumped through this.
9692          */
9693         ret = -EACCES;
9694         fprog = filter->prog->orig_prog;
9695         if (!fprog)
9696                 goto out;
9697
9698         ret = fprog->len;
9699         if (!len)
9700                 /* User space only enquires number of filter blocks. */
9701                 goto out;
9702
9703         ret = -EINVAL;
9704         if (len < fprog->len)
9705                 goto out;
9706
9707         ret = -EFAULT;
9708         if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog)))
9709                 goto out;
9710
9711         /* Instead of bytes, the API requests to return the number
9712          * of filter blocks.
9713          */
9714         ret = fprog->len;
9715 out:
9716         release_sock(sk);
9717         return ret;
9718 }
9719
9720 #ifdef CONFIG_INET
9721 static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern,
9722                                     struct sock_reuseport *reuse,
9723                                     struct sock *sk, struct sk_buff *skb,
9724                                     u32 hash)
9725 {
9726         reuse_kern->skb = skb;
9727         reuse_kern->sk = sk;
9728         reuse_kern->selected_sk = NULL;
9729         reuse_kern->data_end = skb->data + skb_headlen(skb);
9730         reuse_kern->hash = hash;
9731         reuse_kern->reuseport_id = reuse->reuseport_id;
9732         reuse_kern->bind_inany = reuse->bind_inany;
9733 }
9734
9735 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
9736                                   struct bpf_prog *prog, struct sk_buff *skb,
9737                                   u32 hash)
9738 {
9739         struct sk_reuseport_kern reuse_kern;
9740         enum sk_action action;
9741
9742         bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, hash);
9743         action = BPF_PROG_RUN(prog, &reuse_kern);
9744
9745         if (action == SK_PASS)
9746                 return reuse_kern.selected_sk;
9747         else
9748                 return ERR_PTR(-ECONNREFUSED);
9749 }
9750
9751 BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern,
9752            struct bpf_map *, map, void *, key, u32, flags)
9753 {
9754         bool is_sockarray = map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY;
9755         struct sock_reuseport *reuse;
9756         struct sock *selected_sk;
9757
9758         selected_sk = map->ops->map_lookup_elem(map, key);
9759         if (!selected_sk)
9760                 return -ENOENT;
9761
9762         reuse = rcu_dereference(selected_sk->sk_reuseport_cb);
9763         if (!reuse) {
9764                 /* Lookup in sock_map can return TCP ESTABLISHED sockets. */
9765                 if (sk_is_refcounted(selected_sk))
9766                         sock_put(selected_sk);
9767
9768                 /* reuseport_array has only sk with non NULL sk_reuseport_cb.
9769                  * The only (!reuse) case here is - the sk has already been
9770                  * unhashed (e.g. by close()), so treat it as -ENOENT.
9771                  *
9772                  * Other maps (e.g. sock_map) do not provide this guarantee and
9773                  * the sk may never be in the reuseport group to begin with.
9774                  */
9775                 return is_sockarray ? -ENOENT : -EINVAL;
9776         }
9777
9778         if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) {
9779                 struct sock *sk = reuse_kern->sk;
9780
9781                 if (sk->sk_protocol != selected_sk->sk_protocol)
9782                         return -EPROTOTYPE;
9783                 else if (sk->sk_family != selected_sk->sk_family)
9784                         return -EAFNOSUPPORT;
9785
9786                 /* Catch all. Likely bound to a different sockaddr. */
9787                 return -EBADFD;
9788         }
9789
9790         reuse_kern->selected_sk = selected_sk;
9791
9792         return 0;
9793 }
9794
9795 static const struct bpf_func_proto sk_select_reuseport_proto = {
9796         .func           = sk_select_reuseport,
9797         .gpl_only       = false,
9798         .ret_type       = RET_INTEGER,
9799         .arg1_type      = ARG_PTR_TO_CTX,
9800         .arg2_type      = ARG_CONST_MAP_PTR,
9801         .arg3_type      = ARG_PTR_TO_MAP_KEY,
9802         .arg4_type      = ARG_ANYTHING,
9803 };
9804
9805 BPF_CALL_4(sk_reuseport_load_bytes,
9806            const struct sk_reuseport_kern *, reuse_kern, u32, offset,
9807            void *, to, u32, len)
9808 {
9809         return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len);
9810 }
9811
9812 static const struct bpf_func_proto sk_reuseport_load_bytes_proto = {
9813         .func           = sk_reuseport_load_bytes,
9814         .gpl_only       = false,
9815         .ret_type       = RET_INTEGER,
9816         .arg1_type      = ARG_PTR_TO_CTX,
9817         .arg2_type      = ARG_ANYTHING,
9818         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
9819         .arg4_type      = ARG_CONST_SIZE,
9820 };
9821
9822 BPF_CALL_5(sk_reuseport_load_bytes_relative,
9823            const struct sk_reuseport_kern *, reuse_kern, u32, offset,
9824            void *, to, u32, len, u32, start_header)
9825 {
9826         return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to,
9827                                                len, start_header);
9828 }
9829
9830 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = {
9831         .func           = sk_reuseport_load_bytes_relative,
9832         .gpl_only       = false,
9833         .ret_type       = RET_INTEGER,
9834         .arg1_type      = ARG_PTR_TO_CTX,
9835         .arg2_type      = ARG_ANYTHING,
9836         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
9837         .arg4_type      = ARG_CONST_SIZE,
9838         .arg5_type      = ARG_ANYTHING,
9839 };
9840
9841 static const struct bpf_func_proto *
9842 sk_reuseport_func_proto(enum bpf_func_id func_id,
9843                         const struct bpf_prog *prog)
9844 {
9845         switch (func_id) {
9846         case BPF_FUNC_sk_select_reuseport:
9847                 return &sk_select_reuseport_proto;
9848         case BPF_FUNC_skb_load_bytes:
9849                 return &sk_reuseport_load_bytes_proto;
9850         case BPF_FUNC_skb_load_bytes_relative:
9851                 return &sk_reuseport_load_bytes_relative_proto;
9852         default:
9853                 return bpf_base_func_proto(func_id);
9854         }
9855 }
9856
9857 static bool
9858 sk_reuseport_is_valid_access(int off, int size,
9859                              enum bpf_access_type type,
9860                              const struct bpf_prog *prog,
9861                              struct bpf_insn_access_aux *info)
9862 {
9863         const u32 size_default = sizeof(__u32);
9864
9865         if (off < 0 || off >= sizeof(struct sk_reuseport_md) ||
9866             off % size || type != BPF_READ)
9867                 return false;
9868
9869         switch (off) {
9870         case offsetof(struct sk_reuseport_md, data):
9871                 info->reg_type = PTR_TO_PACKET;
9872                 return size == sizeof(__u64);
9873
9874         case offsetof(struct sk_reuseport_md, data_end):
9875                 info->reg_type = PTR_TO_PACKET_END;
9876                 return size == sizeof(__u64);
9877
9878         case offsetof(struct sk_reuseport_md, hash):
9879                 return size == size_default;
9880
9881         /* Fields that allow narrowing */
9882         case bpf_ctx_range(struct sk_reuseport_md, eth_protocol):
9883                 if (size < sizeof_field(struct sk_buff, protocol))
9884                         return false;
9885                 fallthrough;
9886         case bpf_ctx_range(struct sk_reuseport_md, ip_protocol):
9887         case bpf_ctx_range(struct sk_reuseport_md, bind_inany):
9888         case bpf_ctx_range(struct sk_reuseport_md, len):
9889                 bpf_ctx_record_field_size(info, size_default);
9890                 return bpf_ctx_narrow_access_ok(off, size, size_default);
9891
9892         default:
9893                 return false;
9894         }
9895 }
9896
9897 #define SK_REUSEPORT_LOAD_FIELD(F) ({                                   \
9898         *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \
9899                               si->dst_reg, si->src_reg,                 \
9900                               bpf_target_off(struct sk_reuseport_kern, F, \
9901                                              sizeof_field(struct sk_reuseport_kern, F), \
9902                                              target_size));             \
9903         })
9904
9905 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD)                          \
9906         SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern,           \
9907                                     struct sk_buff,                     \
9908                                     skb,                                \
9909                                     SKB_FIELD)
9910
9911 #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD)                            \
9912         SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern,           \
9913                                     struct sock,                        \
9914                                     sk,                                 \
9915                                     SK_FIELD)
9916
9917 static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type,
9918                                            const struct bpf_insn *si,
9919                                            struct bpf_insn *insn_buf,
9920                                            struct bpf_prog *prog,
9921                                            u32 *target_size)
9922 {
9923         struct bpf_insn *insn = insn_buf;
9924
9925         switch (si->off) {
9926         case offsetof(struct sk_reuseport_md, data):
9927                 SK_REUSEPORT_LOAD_SKB_FIELD(data);
9928                 break;
9929
9930         case offsetof(struct sk_reuseport_md, len):
9931                 SK_REUSEPORT_LOAD_SKB_FIELD(len);
9932                 break;
9933
9934         case offsetof(struct sk_reuseport_md, eth_protocol):
9935                 SK_REUSEPORT_LOAD_SKB_FIELD(protocol);
9936                 break;
9937
9938         case offsetof(struct sk_reuseport_md, ip_protocol):
9939                 SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol);
9940                 break;
9941
9942         case offsetof(struct sk_reuseport_md, data_end):
9943                 SK_REUSEPORT_LOAD_FIELD(data_end);
9944                 break;
9945
9946         case offsetof(struct sk_reuseport_md, hash):
9947                 SK_REUSEPORT_LOAD_FIELD(hash);
9948                 break;
9949
9950         case offsetof(struct sk_reuseport_md, bind_inany):
9951                 SK_REUSEPORT_LOAD_FIELD(bind_inany);
9952                 break;
9953         }
9954
9955         return insn - insn_buf;
9956 }
9957
9958 const struct bpf_verifier_ops sk_reuseport_verifier_ops = {
9959         .get_func_proto         = sk_reuseport_func_proto,
9960         .is_valid_access        = sk_reuseport_is_valid_access,
9961         .convert_ctx_access     = sk_reuseport_convert_ctx_access,
9962 };
9963
9964 const struct bpf_prog_ops sk_reuseport_prog_ops = {
9965 };
9966
9967 DEFINE_STATIC_KEY_FALSE(bpf_sk_lookup_enabled);
9968 EXPORT_SYMBOL(bpf_sk_lookup_enabled);
9969
9970 BPF_CALL_3(bpf_sk_lookup_assign, struct bpf_sk_lookup_kern *, ctx,
9971            struct sock *, sk, u64, flags)
9972 {
9973         if (unlikely(flags & ~(BPF_SK_LOOKUP_F_REPLACE |
9974                                BPF_SK_LOOKUP_F_NO_REUSEPORT)))
9975                 return -EINVAL;
9976         if (unlikely(sk && sk_is_refcounted(sk)))
9977                 return -ESOCKTNOSUPPORT; /* reject non-RCU freed sockets */
9978         if (unlikely(sk && sk->sk_state == TCP_ESTABLISHED))
9979                 return -ESOCKTNOSUPPORT; /* reject connected sockets */
9980
9981         /* Check if socket is suitable for packet L3/L4 protocol */
9982         if (sk && sk->sk_protocol != ctx->protocol)
9983                 return -EPROTOTYPE;
9984         if (sk && sk->sk_family != ctx->family &&
9985             (sk->sk_family == AF_INET || ipv6_only_sock(sk)))
9986                 return -EAFNOSUPPORT;
9987
9988         if (ctx->selected_sk && !(flags & BPF_SK_LOOKUP_F_REPLACE))
9989                 return -EEXIST;
9990
9991         /* Select socket as lookup result */
9992         ctx->selected_sk = sk;
9993         ctx->no_reuseport = flags & BPF_SK_LOOKUP_F_NO_REUSEPORT;
9994         return 0;
9995 }
9996
9997 static const struct bpf_func_proto bpf_sk_lookup_assign_proto = {
9998         .func           = bpf_sk_lookup_assign,
9999         .gpl_only       = false,
10000         .ret_type       = RET_INTEGER,
10001         .arg1_type      = ARG_PTR_TO_CTX,
10002         .arg2_type      = ARG_PTR_TO_SOCKET_OR_NULL,
10003         .arg3_type      = ARG_ANYTHING,
10004 };
10005
10006 static const struct bpf_func_proto *
10007 sk_lookup_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
10008 {
10009         switch (func_id) {
10010         case BPF_FUNC_perf_event_output:
10011                 return &bpf_event_output_data_proto;
10012         case BPF_FUNC_sk_assign:
10013                 return &bpf_sk_lookup_assign_proto;
10014         case BPF_FUNC_sk_release:
10015                 return &bpf_sk_release_proto;
10016         default:
10017                 return bpf_sk_base_func_proto(func_id);
10018         }
10019 }
10020
10021 static bool sk_lookup_is_valid_access(int off, int size,
10022                                       enum bpf_access_type type,
10023                                       const struct bpf_prog *prog,
10024                                       struct bpf_insn_access_aux *info)
10025 {
10026         if (off < 0 || off >= sizeof(struct bpf_sk_lookup))
10027                 return false;
10028         if (off % size != 0)
10029                 return false;
10030         if (type != BPF_READ)
10031                 return false;
10032
10033         switch (off) {
10034         case offsetof(struct bpf_sk_lookup, sk):
10035                 info->reg_type = PTR_TO_SOCKET_OR_NULL;
10036                 return size == sizeof(__u64);
10037
10038         case bpf_ctx_range(struct bpf_sk_lookup, family):
10039         case bpf_ctx_range(struct bpf_sk_lookup, protocol):
10040         case bpf_ctx_range(struct bpf_sk_lookup, remote_ip4):
10041         case bpf_ctx_range(struct bpf_sk_lookup, local_ip4):
10042         case bpf_ctx_range_till(struct bpf_sk_lookup, remote_ip6[0], remote_ip6[3]):
10043         case bpf_ctx_range_till(struct bpf_sk_lookup, local_ip6[0], local_ip6[3]):
10044         case bpf_ctx_range(struct bpf_sk_lookup, remote_port):
10045         case bpf_ctx_range(struct bpf_sk_lookup, local_port):
10046                 bpf_ctx_record_field_size(info, sizeof(__u32));
10047                 return bpf_ctx_narrow_access_ok(off, size, sizeof(__u32));
10048
10049         default:
10050                 return false;
10051         }
10052 }
10053
10054 static u32 sk_lookup_convert_ctx_access(enum bpf_access_type type,
10055                                         const struct bpf_insn *si,
10056                                         struct bpf_insn *insn_buf,
10057                                         struct bpf_prog *prog,
10058                                         u32 *target_size)
10059 {
10060         struct bpf_insn *insn = insn_buf;
10061
10062         switch (si->off) {
10063         case offsetof(struct bpf_sk_lookup, sk):
10064                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg,
10065                                       offsetof(struct bpf_sk_lookup_kern, selected_sk));
10066                 break;
10067
10068         case offsetof(struct bpf_sk_lookup, family):
10069                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
10070                                       bpf_target_off(struct bpf_sk_lookup_kern,
10071                                                      family, 2, target_size));
10072                 break;
10073
10074         case offsetof(struct bpf_sk_lookup, protocol):
10075                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
10076                                       bpf_target_off(struct bpf_sk_lookup_kern,
10077                                                      protocol, 2, target_size));
10078                 break;
10079
10080         case offsetof(struct bpf_sk_lookup, remote_ip4):
10081                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
10082                                       bpf_target_off(struct bpf_sk_lookup_kern,
10083                                                      v4.saddr, 4, target_size));
10084                 break;
10085
10086         case offsetof(struct bpf_sk_lookup, local_ip4):
10087                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
10088                                       bpf_target_off(struct bpf_sk_lookup_kern,
10089                                                      v4.daddr, 4, target_size));
10090                 break;
10091
10092         case bpf_ctx_range_till(struct bpf_sk_lookup,
10093                                 remote_ip6[0], remote_ip6[3]): {
10094 #if IS_ENABLED(CONFIG_IPV6)
10095                 int off = si->off;
10096
10097                 off -= offsetof(struct bpf_sk_lookup, remote_ip6[0]);
10098                 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size);
10099                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg,
10100                                       offsetof(struct bpf_sk_lookup_kern, v6.saddr));
10101                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
10102                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off);
10103 #else
10104                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
10105 #endif
10106                 break;
10107         }
10108         case bpf_ctx_range_till(struct bpf_sk_lookup,
10109                                 local_ip6[0], local_ip6[3]): {
10110 #if IS_ENABLED(CONFIG_IPV6)
10111                 int off = si->off;
10112
10113                 off -= offsetof(struct bpf_sk_lookup, local_ip6[0]);
10114                 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size);
10115                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg,
10116                                       offsetof(struct bpf_sk_lookup_kern, v6.daddr));
10117                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
10118                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off);
10119 #else
10120                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
10121 #endif
10122                 break;
10123         }
10124         case offsetof(struct bpf_sk_lookup, remote_port):
10125                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
10126                                       bpf_target_off(struct bpf_sk_lookup_kern,
10127                                                      sport, 2, target_size));
10128                 break;
10129
10130         case offsetof(struct bpf_sk_lookup, local_port):
10131                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
10132                                       bpf_target_off(struct bpf_sk_lookup_kern,
10133                                                      dport, 2, target_size));
10134                 break;
10135         }
10136
10137         return insn - insn_buf;
10138 }
10139
10140 const struct bpf_prog_ops sk_lookup_prog_ops = {
10141 };
10142
10143 const struct bpf_verifier_ops sk_lookup_verifier_ops = {
10144         .get_func_proto         = sk_lookup_func_proto,
10145         .is_valid_access        = sk_lookup_is_valid_access,
10146         .convert_ctx_access     = sk_lookup_convert_ctx_access,
10147 };
10148
10149 #endif /* CONFIG_INET */
10150
10151 DEFINE_BPF_DISPATCHER(xdp)
10152
10153 void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog)
10154 {
10155         bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(xdp), prev_prog, prog);
10156 }
10157
10158 #ifdef CONFIG_DEBUG_INFO_BTF
10159 BTF_ID_LIST_GLOBAL(btf_sock_ids)
10160 #define BTF_SOCK_TYPE(name, type) BTF_ID(struct, type)
10161 BTF_SOCK_TYPE_xxx
10162 #undef BTF_SOCK_TYPE
10163 #else
10164 u32 btf_sock_ids[MAX_BTF_SOCK_TYPE];
10165 #endif
10166
10167 BPF_CALL_1(bpf_skc_to_tcp6_sock, struct sock *, sk)
10168 {
10169         /* tcp6_sock type is not generated in dwarf and hence btf,
10170          * trigger an explicit type generation here.
10171          */
10172         BTF_TYPE_EMIT(struct tcp6_sock);
10173         if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP &&
10174             sk->sk_family == AF_INET6)
10175                 return (unsigned long)sk;
10176
10177         return (unsigned long)NULL;
10178 }
10179
10180 const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto = {
10181         .func                   = bpf_skc_to_tcp6_sock,
10182         .gpl_only               = false,
10183         .ret_type               = RET_PTR_TO_BTF_ID_OR_NULL,
10184         .arg1_type              = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
10185         .ret_btf_id             = &btf_sock_ids[BTF_SOCK_TYPE_TCP6],
10186 };
10187
10188 BPF_CALL_1(bpf_skc_to_tcp_sock, struct sock *, sk)
10189 {
10190         if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP)
10191                 return (unsigned long)sk;
10192
10193         return (unsigned long)NULL;
10194 }
10195
10196 const struct bpf_func_proto bpf_skc_to_tcp_sock_proto = {
10197         .func                   = bpf_skc_to_tcp_sock,
10198         .gpl_only               = false,
10199         .ret_type               = RET_PTR_TO_BTF_ID_OR_NULL,
10200         .arg1_type              = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
10201         .ret_btf_id             = &btf_sock_ids[BTF_SOCK_TYPE_TCP],
10202 };
10203
10204 BPF_CALL_1(bpf_skc_to_tcp_timewait_sock, struct sock *, sk)
10205 {
10206 #ifdef CONFIG_INET
10207         if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_TIME_WAIT)
10208                 return (unsigned long)sk;
10209 #endif
10210
10211 #if IS_BUILTIN(CONFIG_IPV6)
10212         if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_TIME_WAIT)
10213                 return (unsigned long)sk;
10214 #endif
10215
10216         return (unsigned long)NULL;
10217 }
10218
10219 const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto = {
10220         .func                   = bpf_skc_to_tcp_timewait_sock,
10221         .gpl_only               = false,
10222         .ret_type               = RET_PTR_TO_BTF_ID_OR_NULL,
10223         .arg1_type              = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
10224         .ret_btf_id             = &btf_sock_ids[BTF_SOCK_TYPE_TCP_TW],
10225 };
10226
10227 BPF_CALL_1(bpf_skc_to_tcp_request_sock, struct sock *, sk)
10228 {
10229 #ifdef CONFIG_INET
10230         if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_NEW_SYN_RECV)
10231                 return (unsigned long)sk;
10232 #endif
10233
10234 #if IS_BUILTIN(CONFIG_IPV6)
10235         if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_NEW_SYN_RECV)
10236                 return (unsigned long)sk;
10237 #endif
10238
10239         return (unsigned long)NULL;
10240 }
10241
10242 const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto = {
10243         .func                   = bpf_skc_to_tcp_request_sock,
10244         .gpl_only               = false,
10245         .ret_type               = RET_PTR_TO_BTF_ID_OR_NULL,
10246         .arg1_type              = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
10247         .ret_btf_id             = &btf_sock_ids[BTF_SOCK_TYPE_TCP_REQ],
10248 };
10249
10250 BPF_CALL_1(bpf_skc_to_udp6_sock, struct sock *, sk)
10251 {
10252         /* udp6_sock type is not generated in dwarf and hence btf,
10253          * trigger an explicit type generation here.
10254          */
10255         BTF_TYPE_EMIT(struct udp6_sock);
10256         if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_UDP &&
10257             sk->sk_type == SOCK_DGRAM && sk->sk_family == AF_INET6)
10258                 return (unsigned long)sk;
10259
10260         return (unsigned long)NULL;
10261 }
10262
10263 const struct bpf_func_proto bpf_skc_to_udp6_sock_proto = {
10264         .func                   = bpf_skc_to_udp6_sock,
10265         .gpl_only               = false,
10266         .ret_type               = RET_PTR_TO_BTF_ID_OR_NULL,
10267         .arg1_type              = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
10268         .ret_btf_id             = &btf_sock_ids[BTF_SOCK_TYPE_UDP6],
10269 };
10270
10271 static const struct bpf_func_proto *
10272 bpf_sk_base_func_proto(enum bpf_func_id func_id)
10273 {
10274         const struct bpf_func_proto *func;
10275
10276         switch (func_id) {
10277         case BPF_FUNC_skc_to_tcp6_sock:
10278                 func = &bpf_skc_to_tcp6_sock_proto;
10279                 break;
10280         case BPF_FUNC_skc_to_tcp_sock:
10281                 func = &bpf_skc_to_tcp_sock_proto;
10282                 break;
10283         case BPF_FUNC_skc_to_tcp_timewait_sock:
10284                 func = &bpf_skc_to_tcp_timewait_sock_proto;
10285                 break;
10286         case BPF_FUNC_skc_to_tcp_request_sock:
10287                 func = &bpf_skc_to_tcp_request_sock_proto;
10288                 break;
10289         case BPF_FUNC_skc_to_udp6_sock:
10290                 func = &bpf_skc_to_udp6_sock_proto;
10291                 break;
10292         default:
10293                 return bpf_base_func_proto(func_id);
10294         }
10295
10296         if (!perfmon_capable())
10297                 return NULL;
10298
10299         return func;
10300 }