1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Linux Socket Filter - Kernel level socket filtering
5 * Based on the design of the Berkeley Packet Filter. The new
6 * internal format has been designed by PLUMgrid:
8 * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com
12 * Jay Schulist <jschlst@samba.org>
13 * Alexei Starovoitov <ast@plumgrid.com>
14 * Daniel Borkmann <dborkman@redhat.com>
16 * Andi Kleen - Fix a few bad bugs and races.
17 * Kris Katterjohn - Added many additional checks in bpf_check_classic()
20 #include <linux/atomic.h>
21 #include <linux/module.h>
22 #include <linux/types.h>
24 #include <linux/fcntl.h>
25 #include <linux/socket.h>
26 #include <linux/sock_diag.h>
28 #include <linux/inet.h>
29 #include <linux/netdevice.h>
30 #include <linux/if_packet.h>
31 #include <linux/if_arp.h>
32 #include <linux/gfp.h>
33 #include <net/inet_common.h>
35 #include <net/protocol.h>
36 #include <net/netlink.h>
37 #include <linux/skbuff.h>
38 #include <linux/skmsg.h>
40 #include <net/flow_dissector.h>
41 #include <linux/errno.h>
42 #include <linux/timer.h>
43 #include <linux/uaccess.h>
44 #include <asm/unaligned.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>
55 #include <net/sock_reuseport.h>
56 #include <net/busy_poll.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>
70 #include <net/net_namespace.h>
71 #include <linux/seg6_local.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>
81 #include <net/mptcp.h>
83 static const struct bpf_func_proto *
84 bpf_sk_base_func_proto(enum bpf_func_id func_id);
86 int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len)
88 if (in_compat_syscall()) {
89 struct compat_sock_fprog f32;
91 if (len != sizeof(f32))
93 if (copy_from_sockptr(&f32, src, sizeof(f32)))
95 memset(dst, 0, sizeof(*dst));
97 dst->filter = compat_ptr(f32.filter);
99 if (len != sizeof(*dst))
101 if (copy_from_sockptr(dst, src, sizeof(*dst)))
107 EXPORT_SYMBOL_GPL(copy_bpf_fprog_from_user);
110 * sk_filter_trim_cap - run a packet through a socket filter
111 * @sk: sock associated with &sk_buff
112 * @skb: buffer to filter
113 * @cap: limit on how short the eBPF program may trim the packet
115 * Run the eBPF program and then cut skb->data to correct size returned by
116 * the program. If pkt_len is 0 we toss packet. If skb->len is smaller
117 * than pkt_len we keep whole skb->data. This is the socket level
118 * wrapper to bpf_prog_run. It returns 0 if the packet should
119 * be accepted or -EPERM if the packet should be tossed.
122 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap)
125 struct sk_filter *filter;
128 * If the skb was allocated from pfmemalloc reserves, only
129 * allow SOCK_MEMALLOC sockets to use it as this socket is
130 * helping free memory
132 if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) {
133 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP);
136 err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb);
140 err = security_sock_rcv_skb(sk, skb);
145 filter = rcu_dereference(sk->sk_filter);
147 struct sock *save_sk = skb->sk;
148 unsigned int pkt_len;
151 pkt_len = bpf_prog_run_save_cb(filter->prog, skb);
153 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM;
159 EXPORT_SYMBOL(sk_filter_trim_cap);
161 BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb)
163 return skb_get_poff(skb);
166 BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x)
170 if (skb_is_nonlinear(skb))
173 if (skb->len < sizeof(struct nlattr))
176 if (a > skb->len - sizeof(struct nlattr))
179 nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x);
181 return (void *) nla - (void *) skb->data;
186 BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x)
190 if (skb_is_nonlinear(skb))
193 if (skb->len < sizeof(struct nlattr))
196 if (a > skb->len - sizeof(struct nlattr))
199 nla = (struct nlattr *) &skb->data[a];
200 if (nla->nla_len > skb->len - a)
203 nla = nla_find_nested(nla, x);
205 return (void *) nla - (void *) skb->data;
210 BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *,
211 data, int, headlen, int, offset)
214 const int len = sizeof(tmp);
217 if (headlen - offset >= len)
218 return *(u8 *)(data + offset);
219 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
222 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
230 BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb,
233 return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len,
237 BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *,
238 data, int, headlen, int, offset)
241 const int len = sizeof(tmp);
244 if (headlen - offset >= len)
245 return get_unaligned_be16(data + offset);
246 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
247 return be16_to_cpu(tmp);
249 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
251 return get_unaligned_be16(ptr);
257 BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb,
260 return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len,
264 BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *,
265 data, int, headlen, int, offset)
268 const int len = sizeof(tmp);
270 if (likely(offset >= 0)) {
271 if (headlen - offset >= len)
272 return get_unaligned_be32(data + offset);
273 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
274 return be32_to_cpu(tmp);
276 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
278 return get_unaligned_be32(ptr);
284 BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb,
287 return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len,
291 static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg,
292 struct bpf_insn *insn_buf)
294 struct bpf_insn *insn = insn_buf;
298 BUILD_BUG_ON(sizeof_field(struct sk_buff, mark) != 4);
300 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg,
301 offsetof(struct sk_buff, mark));
305 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET);
306 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX);
307 #ifdef __BIG_ENDIAN_BITFIELD
308 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5);
313 BUILD_BUG_ON(sizeof_field(struct sk_buff, queue_mapping) != 2);
315 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
316 offsetof(struct sk_buff, queue_mapping));
319 case SKF_AD_VLAN_TAG:
320 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_tci) != 2);
322 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */
323 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
324 offsetof(struct sk_buff, vlan_tci));
326 case SKF_AD_VLAN_TAG_PRESENT:
327 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_VLAN_PRESENT_OFFSET);
328 if (PKT_VLAN_PRESENT_BIT)
329 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, PKT_VLAN_PRESENT_BIT);
330 if (PKT_VLAN_PRESENT_BIT < 7)
331 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1);
335 return insn - insn_buf;
338 static bool convert_bpf_extensions(struct sock_filter *fp,
339 struct bpf_insn **insnp)
341 struct bpf_insn *insn = *insnp;
345 case SKF_AD_OFF + SKF_AD_PROTOCOL:
346 BUILD_BUG_ON(sizeof_field(struct sk_buff, protocol) != 2);
348 /* A = *(u16 *) (CTX + offsetof(protocol)) */
349 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
350 offsetof(struct sk_buff, protocol));
351 /* A = ntohs(A) [emitting a nop or swap16] */
352 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
355 case SKF_AD_OFF + SKF_AD_PKTTYPE:
356 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn);
360 case SKF_AD_OFF + SKF_AD_IFINDEX:
361 case SKF_AD_OFF + SKF_AD_HATYPE:
362 BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4);
363 BUILD_BUG_ON(sizeof_field(struct net_device, type) != 2);
365 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
366 BPF_REG_TMP, BPF_REG_CTX,
367 offsetof(struct sk_buff, dev));
368 /* if (tmp != 0) goto pc + 1 */
369 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1);
370 *insn++ = BPF_EXIT_INSN();
371 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX)
372 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP,
373 offsetof(struct net_device, ifindex));
375 *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP,
376 offsetof(struct net_device, type));
379 case SKF_AD_OFF + SKF_AD_MARK:
380 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn);
384 case SKF_AD_OFF + SKF_AD_RXHASH:
385 BUILD_BUG_ON(sizeof_field(struct sk_buff, hash) != 4);
387 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX,
388 offsetof(struct sk_buff, hash));
391 case SKF_AD_OFF + SKF_AD_QUEUE:
392 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn);
396 case SKF_AD_OFF + SKF_AD_VLAN_TAG:
397 cnt = convert_skb_access(SKF_AD_VLAN_TAG,
398 BPF_REG_A, BPF_REG_CTX, insn);
402 case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT:
403 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT,
404 BPF_REG_A, BPF_REG_CTX, insn);
408 case SKF_AD_OFF + SKF_AD_VLAN_TPID:
409 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_proto) != 2);
411 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */
412 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
413 offsetof(struct sk_buff, vlan_proto));
414 /* A = ntohs(A) [emitting a nop or swap16] */
415 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
418 case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
419 case SKF_AD_OFF + SKF_AD_NLATTR:
420 case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
421 case SKF_AD_OFF + SKF_AD_CPU:
422 case SKF_AD_OFF + SKF_AD_RANDOM:
424 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX);
426 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A);
428 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X);
429 /* Emit call(arg1=CTX, arg2=A, arg3=X) */
431 case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
432 *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset);
434 case SKF_AD_OFF + SKF_AD_NLATTR:
435 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr);
437 case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
438 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest);
440 case SKF_AD_OFF + SKF_AD_CPU:
441 *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id);
443 case SKF_AD_OFF + SKF_AD_RANDOM:
444 *insn = BPF_EMIT_CALL(bpf_user_rnd_u32);
445 bpf_user_rnd_init_once();
450 case SKF_AD_OFF + SKF_AD_ALU_XOR_X:
452 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X);
456 /* This is just a dummy call to avoid letting the compiler
457 * evict __bpf_call_base() as an optimization. Placed here
458 * where no-one bothers.
460 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0);
468 static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp)
470 const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS);
471 int size = bpf_size_to_bytes(BPF_SIZE(fp->code));
472 bool endian = BPF_SIZE(fp->code) == BPF_H ||
473 BPF_SIZE(fp->code) == BPF_W;
474 bool indirect = BPF_MODE(fp->code) == BPF_IND;
475 const int ip_align = NET_IP_ALIGN;
476 struct bpf_insn *insn = *insnp;
480 ((unaligned_ok && offset >= 0) ||
481 (!unaligned_ok && offset >= 0 &&
482 offset + ip_align >= 0 &&
483 offset + ip_align % size == 0))) {
484 bool ldx_off_ok = offset <= S16_MAX;
486 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H);
488 *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset);
489 *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP,
490 size, 2 + endian + (!ldx_off_ok * 2));
492 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A,
495 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D);
496 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset);
497 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A,
501 *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8);
502 *insn++ = BPF_JMP_A(8);
505 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX);
506 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D);
507 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H);
509 *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset);
511 *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X);
513 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset);
516 switch (BPF_SIZE(fp->code)) {
518 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8);
521 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16);
524 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32);
530 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2);
531 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
532 *insn = BPF_EXIT_INSN();
539 * bpf_convert_filter - convert filter program
540 * @prog: the user passed filter program
541 * @len: the length of the user passed filter program
542 * @new_prog: allocated 'struct bpf_prog' or NULL
543 * @new_len: pointer to store length of converted program
544 * @seen_ld_abs: bool whether we've seen ld_abs/ind
546 * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn'
547 * style extended BPF (eBPF).
548 * Conversion workflow:
550 * 1) First pass for calculating the new program length:
551 * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs)
553 * 2) 2nd pass to remap in two passes: 1st pass finds new
554 * jump offsets, 2nd pass remapping:
555 * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs)
557 static int bpf_convert_filter(struct sock_filter *prog, int len,
558 struct bpf_prog *new_prog, int *new_len,
561 int new_flen = 0, pass = 0, target, i, stack_off;
562 struct bpf_insn *new_insn, *first_insn = NULL;
563 struct sock_filter *fp;
567 BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK);
568 BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG);
570 if (len <= 0 || len > BPF_MAXINSNS)
574 first_insn = new_prog->insnsi;
575 addrs = kcalloc(len, sizeof(*addrs),
576 GFP_KERNEL | __GFP_NOWARN);
582 new_insn = first_insn;
585 /* Classic BPF related prologue emission. */
587 /* Classic BPF expects A and X to be reset first. These need
588 * to be guaranteed to be the first two instructions.
590 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
591 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X);
593 /* All programs must keep CTX in callee saved BPF_REG_CTX.
594 * In eBPF case it's done by the compiler, here we need to
595 * do this ourself. Initial CTX is present in BPF_REG_ARG1.
597 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1);
599 /* For packet access in classic BPF, cache skb->data
600 * in callee-saved BPF R8 and skb->len - skb->data_len
601 * (headlen) in BPF R9. Since classic BPF is read-only
602 * on CTX, we only need to cache it once.
604 *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
605 BPF_REG_D, BPF_REG_CTX,
606 offsetof(struct sk_buff, data));
607 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX,
608 offsetof(struct sk_buff, len));
609 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX,
610 offsetof(struct sk_buff, data_len));
611 *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP);
617 for (i = 0; i < len; fp++, i++) {
618 struct bpf_insn tmp_insns[32] = { };
619 struct bpf_insn *insn = tmp_insns;
622 addrs[i] = new_insn - first_insn;
625 /* All arithmetic insns and skb loads map as-is. */
626 case BPF_ALU | BPF_ADD | BPF_X:
627 case BPF_ALU | BPF_ADD | BPF_K:
628 case BPF_ALU | BPF_SUB | BPF_X:
629 case BPF_ALU | BPF_SUB | BPF_K:
630 case BPF_ALU | BPF_AND | BPF_X:
631 case BPF_ALU | BPF_AND | BPF_K:
632 case BPF_ALU | BPF_OR | BPF_X:
633 case BPF_ALU | BPF_OR | BPF_K:
634 case BPF_ALU | BPF_LSH | BPF_X:
635 case BPF_ALU | BPF_LSH | BPF_K:
636 case BPF_ALU | BPF_RSH | BPF_X:
637 case BPF_ALU | BPF_RSH | BPF_K:
638 case BPF_ALU | BPF_XOR | BPF_X:
639 case BPF_ALU | BPF_XOR | BPF_K:
640 case BPF_ALU | BPF_MUL | BPF_X:
641 case BPF_ALU | BPF_MUL | BPF_K:
642 case BPF_ALU | BPF_DIV | BPF_X:
643 case BPF_ALU | BPF_DIV | BPF_K:
644 case BPF_ALU | BPF_MOD | BPF_X:
645 case BPF_ALU | BPF_MOD | BPF_K:
646 case BPF_ALU | BPF_NEG:
647 case BPF_LD | BPF_ABS | BPF_W:
648 case BPF_LD | BPF_ABS | BPF_H:
649 case BPF_LD | BPF_ABS | BPF_B:
650 case BPF_LD | BPF_IND | BPF_W:
651 case BPF_LD | BPF_IND | BPF_H:
652 case BPF_LD | BPF_IND | BPF_B:
653 /* Check for overloaded BPF extension and
654 * directly convert it if found, otherwise
655 * just move on with mapping.
657 if (BPF_CLASS(fp->code) == BPF_LD &&
658 BPF_MODE(fp->code) == BPF_ABS &&
659 convert_bpf_extensions(fp, &insn))
661 if (BPF_CLASS(fp->code) == BPF_LD &&
662 convert_bpf_ld_abs(fp, &insn)) {
667 if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) ||
668 fp->code == (BPF_ALU | BPF_MOD | BPF_X)) {
669 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X);
670 /* Error with exception code on div/mod by 0.
671 * For cBPF programs, this was always return 0.
673 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2);
674 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
675 *insn++ = BPF_EXIT_INSN();
678 *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k);
681 /* Jump transformation cannot use BPF block macros
682 * everywhere as offset calculation and target updates
683 * require a bit more work than the rest, i.e. jump
684 * opcodes map as-is, but offsets need adjustment.
687 #define BPF_EMIT_JMP \
689 const s32 off_min = S16_MIN, off_max = S16_MAX; \
692 if (target >= len || target < 0) \
694 off = addrs ? addrs[target] - addrs[i] - 1 : 0; \
695 /* Adjust pc relative offset for 2nd or 3rd insn. */ \
696 off -= insn - tmp_insns; \
697 /* Reject anything not fitting into insn->off. */ \
698 if (off < off_min || off > off_max) \
703 case BPF_JMP | BPF_JA:
704 target = i + fp->k + 1;
705 insn->code = fp->code;
709 case BPF_JMP | BPF_JEQ | BPF_K:
710 case BPF_JMP | BPF_JEQ | BPF_X:
711 case BPF_JMP | BPF_JSET | BPF_K:
712 case BPF_JMP | BPF_JSET | BPF_X:
713 case BPF_JMP | BPF_JGT | BPF_K:
714 case BPF_JMP | BPF_JGT | BPF_X:
715 case BPF_JMP | BPF_JGE | BPF_K:
716 case BPF_JMP | BPF_JGE | BPF_X:
717 if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) {
718 /* BPF immediates are signed, zero extend
719 * immediate into tmp register and use it
722 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k);
724 insn->dst_reg = BPF_REG_A;
725 insn->src_reg = BPF_REG_TMP;
728 insn->dst_reg = BPF_REG_A;
730 bpf_src = BPF_SRC(fp->code);
731 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0;
734 /* Common case where 'jump_false' is next insn. */
736 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
737 target = i + fp->jt + 1;
742 /* Convert some jumps when 'jump_true' is next insn. */
744 switch (BPF_OP(fp->code)) {
746 insn->code = BPF_JMP | BPF_JNE | bpf_src;
749 insn->code = BPF_JMP | BPF_JLE | bpf_src;
752 insn->code = BPF_JMP | BPF_JLT | bpf_src;
758 target = i + fp->jf + 1;
763 /* Other jumps are mapped into two insns: Jxx and JA. */
764 target = i + fp->jt + 1;
765 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
769 insn->code = BPF_JMP | BPF_JA;
770 target = i + fp->jf + 1;
774 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */
775 case BPF_LDX | BPF_MSH | BPF_B: {
776 struct sock_filter tmp = {
777 .code = BPF_LD | BPF_ABS | BPF_B,
784 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
785 /* A = BPF_R0 = *(u8 *) (skb->data + K) */
786 convert_bpf_ld_abs(&tmp, &insn);
789 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf);
791 *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2);
793 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X);
795 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
797 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP);
800 /* RET_K is remaped into 2 insns. RET_A case doesn't need an
801 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A.
803 case BPF_RET | BPF_A:
804 case BPF_RET | BPF_K:
805 if (BPF_RVAL(fp->code) == BPF_K)
806 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0,
808 *insn = BPF_EXIT_INSN();
811 /* Store to stack. */
814 stack_off = fp->k * 4 + 4;
815 *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) ==
816 BPF_ST ? BPF_REG_A : BPF_REG_X,
818 /* check_load_and_stores() verifies that classic BPF can
819 * load from stack only after write, so tracking
820 * stack_depth for ST|STX insns is enough
822 if (new_prog && new_prog->aux->stack_depth < stack_off)
823 new_prog->aux->stack_depth = stack_off;
826 /* Load from stack. */
827 case BPF_LD | BPF_MEM:
828 case BPF_LDX | BPF_MEM:
829 stack_off = fp->k * 4 + 4;
830 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ?
831 BPF_REG_A : BPF_REG_X, BPF_REG_FP,
836 case BPF_LD | BPF_IMM:
837 case BPF_LDX | BPF_IMM:
838 *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ?
839 BPF_REG_A : BPF_REG_X, fp->k);
843 case BPF_MISC | BPF_TAX:
844 *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
848 case BPF_MISC | BPF_TXA:
849 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X);
852 /* A = skb->len or X = skb->len */
853 case BPF_LD | BPF_W | BPF_LEN:
854 case BPF_LDX | BPF_W | BPF_LEN:
855 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ?
856 BPF_REG_A : BPF_REG_X, BPF_REG_CTX,
857 offsetof(struct sk_buff, len));
860 /* Access seccomp_data fields. */
861 case BPF_LDX | BPF_ABS | BPF_W:
862 /* A = *(u32 *) (ctx + K) */
863 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k);
866 /* Unknown instruction. */
873 memcpy(new_insn, tmp_insns,
874 sizeof(*insn) * (insn - tmp_insns));
875 new_insn += insn - tmp_insns;
879 /* Only calculating new length. */
880 *new_len = new_insn - first_insn;
882 *new_len += 4; /* Prologue bits. */
887 if (new_flen != new_insn - first_insn) {
888 new_flen = new_insn - first_insn;
895 BUG_ON(*new_len != new_flen);
904 * As we dont want to clear mem[] array for each packet going through
905 * __bpf_prog_run(), we check that filter loaded by user never try to read
906 * a cell if not previously written, and we check all branches to be sure
907 * a malicious user doesn't try to abuse us.
909 static int check_load_and_stores(const struct sock_filter *filter, int flen)
911 u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */
914 BUILD_BUG_ON(BPF_MEMWORDS > 16);
916 masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL);
920 memset(masks, 0xff, flen * sizeof(*masks));
922 for (pc = 0; pc < flen; pc++) {
923 memvalid &= masks[pc];
925 switch (filter[pc].code) {
928 memvalid |= (1 << filter[pc].k);
930 case BPF_LD | BPF_MEM:
931 case BPF_LDX | BPF_MEM:
932 if (!(memvalid & (1 << filter[pc].k))) {
937 case BPF_JMP | BPF_JA:
938 /* A jump must set masks on target */
939 masks[pc + 1 + filter[pc].k] &= memvalid;
942 case BPF_JMP | BPF_JEQ | BPF_K:
943 case BPF_JMP | BPF_JEQ | BPF_X:
944 case BPF_JMP | BPF_JGE | BPF_K:
945 case BPF_JMP | BPF_JGE | BPF_X:
946 case BPF_JMP | BPF_JGT | BPF_K:
947 case BPF_JMP | BPF_JGT | BPF_X:
948 case BPF_JMP | BPF_JSET | BPF_K:
949 case BPF_JMP | BPF_JSET | BPF_X:
950 /* A jump must set masks on targets */
951 masks[pc + 1 + filter[pc].jt] &= memvalid;
952 masks[pc + 1 + filter[pc].jf] &= memvalid;
962 static bool chk_code_allowed(u16 code_to_probe)
964 static const bool codes[] = {
965 /* 32 bit ALU operations */
966 [BPF_ALU | BPF_ADD | BPF_K] = true,
967 [BPF_ALU | BPF_ADD | BPF_X] = true,
968 [BPF_ALU | BPF_SUB | BPF_K] = true,
969 [BPF_ALU | BPF_SUB | BPF_X] = true,
970 [BPF_ALU | BPF_MUL | BPF_K] = true,
971 [BPF_ALU | BPF_MUL | BPF_X] = true,
972 [BPF_ALU | BPF_DIV | BPF_K] = true,
973 [BPF_ALU | BPF_DIV | BPF_X] = true,
974 [BPF_ALU | BPF_MOD | BPF_K] = true,
975 [BPF_ALU | BPF_MOD | BPF_X] = true,
976 [BPF_ALU | BPF_AND | BPF_K] = true,
977 [BPF_ALU | BPF_AND | BPF_X] = true,
978 [BPF_ALU | BPF_OR | BPF_K] = true,
979 [BPF_ALU | BPF_OR | BPF_X] = true,
980 [BPF_ALU | BPF_XOR | BPF_K] = true,
981 [BPF_ALU | BPF_XOR | BPF_X] = true,
982 [BPF_ALU | BPF_LSH | BPF_K] = true,
983 [BPF_ALU | BPF_LSH | BPF_X] = true,
984 [BPF_ALU | BPF_RSH | BPF_K] = true,
985 [BPF_ALU | BPF_RSH | BPF_X] = true,
986 [BPF_ALU | BPF_NEG] = true,
987 /* Load instructions */
988 [BPF_LD | BPF_W | BPF_ABS] = true,
989 [BPF_LD | BPF_H | BPF_ABS] = true,
990 [BPF_LD | BPF_B | BPF_ABS] = true,
991 [BPF_LD | BPF_W | BPF_LEN] = true,
992 [BPF_LD | BPF_W | BPF_IND] = true,
993 [BPF_LD | BPF_H | BPF_IND] = true,
994 [BPF_LD | BPF_B | BPF_IND] = true,
995 [BPF_LD | BPF_IMM] = true,
996 [BPF_LD | BPF_MEM] = true,
997 [BPF_LDX | BPF_W | BPF_LEN] = true,
998 [BPF_LDX | BPF_B | BPF_MSH] = true,
999 [BPF_LDX | BPF_IMM] = true,
1000 [BPF_LDX | BPF_MEM] = true,
1001 /* Store instructions */
1004 /* Misc instructions */
1005 [BPF_MISC | BPF_TAX] = true,
1006 [BPF_MISC | BPF_TXA] = true,
1007 /* Return instructions */
1008 [BPF_RET | BPF_K] = true,
1009 [BPF_RET | BPF_A] = true,
1010 /* Jump instructions */
1011 [BPF_JMP | BPF_JA] = true,
1012 [BPF_JMP | BPF_JEQ | BPF_K] = true,
1013 [BPF_JMP | BPF_JEQ | BPF_X] = true,
1014 [BPF_JMP | BPF_JGE | BPF_K] = true,
1015 [BPF_JMP | BPF_JGE | BPF_X] = true,
1016 [BPF_JMP | BPF_JGT | BPF_K] = true,
1017 [BPF_JMP | BPF_JGT | BPF_X] = true,
1018 [BPF_JMP | BPF_JSET | BPF_K] = true,
1019 [BPF_JMP | BPF_JSET | BPF_X] = true,
1022 if (code_to_probe >= ARRAY_SIZE(codes))
1025 return codes[code_to_probe];
1028 static bool bpf_check_basics_ok(const struct sock_filter *filter,
1033 if (flen == 0 || flen > BPF_MAXINSNS)
1040 * bpf_check_classic - verify socket filter code
1041 * @filter: filter to verify
1042 * @flen: length of filter
1044 * Check the user's filter code. If we let some ugly
1045 * filter code slip through kaboom! The filter must contain
1046 * no references or jumps that are out of range, no illegal
1047 * instructions, and must end with a RET instruction.
1049 * All jumps are forward as they are not signed.
1051 * Returns 0 if the rule set is legal or -EINVAL if not.
1053 static int bpf_check_classic(const struct sock_filter *filter,
1059 /* Check the filter code now */
1060 for (pc = 0; pc < flen; pc++) {
1061 const struct sock_filter *ftest = &filter[pc];
1063 /* May we actually operate on this code? */
1064 if (!chk_code_allowed(ftest->code))
1067 /* Some instructions need special checks */
1068 switch (ftest->code) {
1069 case BPF_ALU | BPF_DIV | BPF_K:
1070 case BPF_ALU | BPF_MOD | BPF_K:
1071 /* Check for division by zero */
1075 case BPF_ALU | BPF_LSH | BPF_K:
1076 case BPF_ALU | BPF_RSH | BPF_K:
1080 case BPF_LD | BPF_MEM:
1081 case BPF_LDX | BPF_MEM:
1084 /* Check for invalid memory addresses */
1085 if (ftest->k >= BPF_MEMWORDS)
1088 case BPF_JMP | BPF_JA:
1089 /* Note, the large ftest->k might cause loops.
1090 * Compare this with conditional jumps below,
1091 * where offsets are limited. --ANK (981016)
1093 if (ftest->k >= (unsigned int)(flen - pc - 1))
1096 case BPF_JMP | BPF_JEQ | BPF_K:
1097 case BPF_JMP | BPF_JEQ | BPF_X:
1098 case BPF_JMP | BPF_JGE | BPF_K:
1099 case BPF_JMP | BPF_JGE | BPF_X:
1100 case BPF_JMP | BPF_JGT | BPF_K:
1101 case BPF_JMP | BPF_JGT | BPF_X:
1102 case BPF_JMP | BPF_JSET | BPF_K:
1103 case BPF_JMP | BPF_JSET | BPF_X:
1104 /* Both conditionals must be safe */
1105 if (pc + ftest->jt + 1 >= flen ||
1106 pc + ftest->jf + 1 >= flen)
1109 case BPF_LD | BPF_W | BPF_ABS:
1110 case BPF_LD | BPF_H | BPF_ABS:
1111 case BPF_LD | BPF_B | BPF_ABS:
1113 if (bpf_anc_helper(ftest) & BPF_ANC)
1115 /* Ancillary operation unknown or unsupported */
1116 if (anc_found == false && ftest->k >= SKF_AD_OFF)
1121 /* Last instruction must be a RET code */
1122 switch (filter[flen - 1].code) {
1123 case BPF_RET | BPF_K:
1124 case BPF_RET | BPF_A:
1125 return check_load_and_stores(filter, flen);
1131 static int bpf_prog_store_orig_filter(struct bpf_prog *fp,
1132 const struct sock_fprog *fprog)
1134 unsigned int fsize = bpf_classic_proglen(fprog);
1135 struct sock_fprog_kern *fkprog;
1137 fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL);
1141 fkprog = fp->orig_prog;
1142 fkprog->len = fprog->len;
1144 fkprog->filter = kmemdup(fp->insns, fsize,
1145 GFP_KERNEL | __GFP_NOWARN);
1146 if (!fkprog->filter) {
1147 kfree(fp->orig_prog);
1154 static void bpf_release_orig_filter(struct bpf_prog *fp)
1156 struct sock_fprog_kern *fprog = fp->orig_prog;
1159 kfree(fprog->filter);
1164 static void __bpf_prog_release(struct bpf_prog *prog)
1166 if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) {
1169 bpf_release_orig_filter(prog);
1170 bpf_prog_free(prog);
1174 static void __sk_filter_release(struct sk_filter *fp)
1176 __bpf_prog_release(fp->prog);
1181 * sk_filter_release_rcu - Release a socket filter by rcu_head
1182 * @rcu: rcu_head that contains the sk_filter to free
1184 static void sk_filter_release_rcu(struct rcu_head *rcu)
1186 struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu);
1188 __sk_filter_release(fp);
1192 * sk_filter_release - release a socket filter
1193 * @fp: filter to remove
1195 * Remove a filter from a socket and release its resources.
1197 static void sk_filter_release(struct sk_filter *fp)
1199 if (refcount_dec_and_test(&fp->refcnt))
1200 call_rcu(&fp->rcu, sk_filter_release_rcu);
1203 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp)
1205 u32 filter_size = bpf_prog_size(fp->prog->len);
1207 atomic_sub(filter_size, &sk->sk_omem_alloc);
1208 sk_filter_release(fp);
1211 /* try to charge the socket memory if there is space available
1212 * return true on success
1214 static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp)
1216 u32 filter_size = bpf_prog_size(fp->prog->len);
1217 int optmem_max = READ_ONCE(sysctl_optmem_max);
1219 /* same check as in sock_kmalloc() */
1220 if (filter_size <= optmem_max &&
1221 atomic_read(&sk->sk_omem_alloc) + filter_size < optmem_max) {
1222 atomic_add(filter_size, &sk->sk_omem_alloc);
1228 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp)
1230 if (!refcount_inc_not_zero(&fp->refcnt))
1233 if (!__sk_filter_charge(sk, fp)) {
1234 sk_filter_release(fp);
1240 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp)
1242 struct sock_filter *old_prog;
1243 struct bpf_prog *old_fp;
1244 int err, new_len, old_len = fp->len;
1245 bool seen_ld_abs = false;
1247 /* We are free to overwrite insns et al right here as it won't be used at
1248 * this point in time anymore internally after the migration to the eBPF
1249 * instruction representation.
1251 BUILD_BUG_ON(sizeof(struct sock_filter) !=
1252 sizeof(struct bpf_insn));
1254 /* Conversion cannot happen on overlapping memory areas,
1255 * so we need to keep the user BPF around until the 2nd
1256 * pass. At this time, the user BPF is stored in fp->insns.
1258 old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter),
1259 GFP_KERNEL | __GFP_NOWARN);
1265 /* 1st pass: calculate the new program length. */
1266 err = bpf_convert_filter(old_prog, old_len, NULL, &new_len,
1271 /* Expand fp for appending the new filter representation. */
1273 fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0);
1275 /* The old_fp is still around in case we couldn't
1276 * allocate new memory, so uncharge on that one.
1285 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */
1286 err = bpf_convert_filter(old_prog, old_len, fp, &new_len,
1289 /* 2nd bpf_convert_filter() can fail only if it fails
1290 * to allocate memory, remapping must succeed. Note,
1291 * that at this time old_fp has already been released
1296 fp = bpf_prog_select_runtime(fp, &err);
1306 __bpf_prog_release(fp);
1307 return ERR_PTR(err);
1310 static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp,
1311 bpf_aux_classic_check_t trans)
1315 fp->bpf_func = NULL;
1318 err = bpf_check_classic(fp->insns, fp->len);
1320 __bpf_prog_release(fp);
1321 return ERR_PTR(err);
1324 /* There might be additional checks and transformations
1325 * needed on classic filters, f.e. in case of seccomp.
1328 err = trans(fp->insns, fp->len);
1330 __bpf_prog_release(fp);
1331 return ERR_PTR(err);
1335 /* Probe if we can JIT compile the filter and if so, do
1336 * the compilation of the filter.
1338 bpf_jit_compile(fp);
1340 /* JIT compiler couldn't process this filter, so do the eBPF translation
1341 * for the optimized interpreter.
1344 fp = bpf_migrate_filter(fp);
1350 * bpf_prog_create - create an unattached filter
1351 * @pfp: the unattached filter that is created
1352 * @fprog: the filter program
1354 * Create a filter independent of any socket. We first run some
1355 * sanity checks on it to make sure it does not explode on us later.
1356 * If an error occurs or there is insufficient memory for the filter
1357 * a negative errno code is returned. On success the return is zero.
1359 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog)
1361 unsigned int fsize = bpf_classic_proglen(fprog);
1362 struct bpf_prog *fp;
1364 /* Make sure new filter is there and in the right amounts. */
1365 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1368 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1372 memcpy(fp->insns, fprog->filter, fsize);
1374 fp->len = fprog->len;
1375 /* Since unattached filters are not copied back to user
1376 * space through sk_get_filter(), we do not need to hold
1377 * a copy here, and can spare us the work.
1379 fp->orig_prog = NULL;
1381 /* bpf_prepare_filter() already takes care of freeing
1382 * memory in case something goes wrong.
1384 fp = bpf_prepare_filter(fp, NULL);
1391 EXPORT_SYMBOL_GPL(bpf_prog_create);
1394 * bpf_prog_create_from_user - create an unattached filter from user buffer
1395 * @pfp: the unattached filter that is created
1396 * @fprog: the filter program
1397 * @trans: post-classic verifier transformation handler
1398 * @save_orig: save classic BPF program
1400 * This function effectively does the same as bpf_prog_create(), only
1401 * that it builds up its insns buffer from user space provided buffer.
1402 * It also allows for passing a bpf_aux_classic_check_t handler.
1404 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
1405 bpf_aux_classic_check_t trans, bool save_orig)
1407 unsigned int fsize = bpf_classic_proglen(fprog);
1408 struct bpf_prog *fp;
1411 /* Make sure new filter is there and in the right amounts. */
1412 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1415 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1419 if (copy_from_user(fp->insns, fprog->filter, fsize)) {
1420 __bpf_prog_free(fp);
1424 fp->len = fprog->len;
1425 fp->orig_prog = NULL;
1428 err = bpf_prog_store_orig_filter(fp, fprog);
1430 __bpf_prog_free(fp);
1435 /* bpf_prepare_filter() already takes care of freeing
1436 * memory in case something goes wrong.
1438 fp = bpf_prepare_filter(fp, trans);
1445 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user);
1447 void bpf_prog_destroy(struct bpf_prog *fp)
1449 __bpf_prog_release(fp);
1451 EXPORT_SYMBOL_GPL(bpf_prog_destroy);
1453 static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk)
1455 struct sk_filter *fp, *old_fp;
1457 fp = kmalloc(sizeof(*fp), GFP_KERNEL);
1463 if (!__sk_filter_charge(sk, fp)) {
1467 refcount_set(&fp->refcnt, 1);
1469 old_fp = rcu_dereference_protected(sk->sk_filter,
1470 lockdep_sock_is_held(sk));
1471 rcu_assign_pointer(sk->sk_filter, fp);
1474 sk_filter_uncharge(sk, old_fp);
1480 struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk)
1482 unsigned int fsize = bpf_classic_proglen(fprog);
1483 struct bpf_prog *prog;
1486 if (sock_flag(sk, SOCK_FILTER_LOCKED))
1487 return ERR_PTR(-EPERM);
1489 /* Make sure new filter is there and in the right amounts. */
1490 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1491 return ERR_PTR(-EINVAL);
1493 prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1495 return ERR_PTR(-ENOMEM);
1497 if (copy_from_user(prog->insns, fprog->filter, fsize)) {
1498 __bpf_prog_free(prog);
1499 return ERR_PTR(-EFAULT);
1502 prog->len = fprog->len;
1504 err = bpf_prog_store_orig_filter(prog, fprog);
1506 __bpf_prog_free(prog);
1507 return ERR_PTR(-ENOMEM);
1510 /* bpf_prepare_filter() already takes care of freeing
1511 * memory in case something goes wrong.
1513 return bpf_prepare_filter(prog, NULL);
1517 * sk_attach_filter - attach a socket filter
1518 * @fprog: the filter program
1519 * @sk: the socket to use
1521 * Attach the user's filter code. We first run some sanity checks on
1522 * it to make sure it does not explode on us later. If an error
1523 * occurs or there is insufficient memory for the filter a negative
1524 * errno code is returned. On success the return is zero.
1526 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
1528 struct bpf_prog *prog = __get_filter(fprog, sk);
1532 return PTR_ERR(prog);
1534 err = __sk_attach_prog(prog, sk);
1536 __bpf_prog_release(prog);
1542 EXPORT_SYMBOL_GPL(sk_attach_filter);
1544 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk)
1546 struct bpf_prog *prog = __get_filter(fprog, sk);
1550 return PTR_ERR(prog);
1552 if (bpf_prog_size(prog->len) > READ_ONCE(sysctl_optmem_max))
1555 err = reuseport_attach_prog(sk, prog);
1558 __bpf_prog_release(prog);
1563 static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk)
1565 if (sock_flag(sk, SOCK_FILTER_LOCKED))
1566 return ERR_PTR(-EPERM);
1568 return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
1571 int sk_attach_bpf(u32 ufd, struct sock *sk)
1573 struct bpf_prog *prog = __get_bpf(ufd, sk);
1577 return PTR_ERR(prog);
1579 err = __sk_attach_prog(prog, sk);
1588 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk)
1590 struct bpf_prog *prog;
1593 if (sock_flag(sk, SOCK_FILTER_LOCKED))
1596 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
1597 if (PTR_ERR(prog) == -EINVAL)
1598 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT);
1600 return PTR_ERR(prog);
1602 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) {
1603 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER
1604 * bpf prog (e.g. sockmap). It depends on the
1605 * limitation imposed by bpf_prog_load().
1606 * Hence, sysctl_optmem_max is not checked.
1608 if ((sk->sk_type != SOCK_STREAM &&
1609 sk->sk_type != SOCK_DGRAM) ||
1610 (sk->sk_protocol != IPPROTO_UDP &&
1611 sk->sk_protocol != IPPROTO_TCP) ||
1612 (sk->sk_family != AF_INET &&
1613 sk->sk_family != AF_INET6)) {
1618 /* BPF_PROG_TYPE_SOCKET_FILTER */
1619 if (bpf_prog_size(prog->len) > READ_ONCE(sysctl_optmem_max)) {
1625 err = reuseport_attach_prog(sk, prog);
1633 void sk_reuseport_prog_free(struct bpf_prog *prog)
1638 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT)
1641 bpf_prog_destroy(prog);
1644 struct bpf_scratchpad {
1646 __be32 diff[MAX_BPF_STACK / sizeof(__be32)];
1647 u8 buff[MAX_BPF_STACK];
1651 static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp);
1653 static inline int __bpf_try_make_writable(struct sk_buff *skb,
1654 unsigned int write_len)
1656 return skb_ensure_writable(skb, write_len);
1659 static inline int bpf_try_make_writable(struct sk_buff *skb,
1660 unsigned int write_len)
1662 int err = __bpf_try_make_writable(skb, write_len);
1664 bpf_compute_data_pointers(skb);
1668 static int bpf_try_make_head_writable(struct sk_buff *skb)
1670 return bpf_try_make_writable(skb, skb_headlen(skb));
1673 static inline void bpf_push_mac_rcsum(struct sk_buff *skb)
1675 if (skb_at_tc_ingress(skb))
1676 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1679 static inline void bpf_pull_mac_rcsum(struct sk_buff *skb)
1681 if (skb_at_tc_ingress(skb))
1682 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1685 BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset,
1686 const void *, from, u32, len, u64, flags)
1690 if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH)))
1692 if (unlikely(offset > INT_MAX))
1694 if (unlikely(bpf_try_make_writable(skb, offset + len)))
1697 ptr = skb->data + offset;
1698 if (flags & BPF_F_RECOMPUTE_CSUM)
1699 __skb_postpull_rcsum(skb, ptr, len, offset);
1701 memcpy(ptr, from, len);
1703 if (flags & BPF_F_RECOMPUTE_CSUM)
1704 __skb_postpush_rcsum(skb, ptr, len, offset);
1705 if (flags & BPF_F_INVALIDATE_HASH)
1706 skb_clear_hash(skb);
1711 static const struct bpf_func_proto bpf_skb_store_bytes_proto = {
1712 .func = bpf_skb_store_bytes,
1714 .ret_type = RET_INTEGER,
1715 .arg1_type = ARG_PTR_TO_CTX,
1716 .arg2_type = ARG_ANYTHING,
1717 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY,
1718 .arg4_type = ARG_CONST_SIZE,
1719 .arg5_type = ARG_ANYTHING,
1722 BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset,
1723 void *, to, u32, len)
1727 if (unlikely(offset > INT_MAX))
1730 ptr = skb_header_pointer(skb, offset, len, to);
1734 memcpy(to, ptr, len);
1742 static const struct bpf_func_proto bpf_skb_load_bytes_proto = {
1743 .func = bpf_skb_load_bytes,
1745 .ret_type = RET_INTEGER,
1746 .arg1_type = ARG_PTR_TO_CTX,
1747 .arg2_type = ARG_ANYTHING,
1748 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
1749 .arg4_type = ARG_CONST_SIZE,
1752 BPF_CALL_4(bpf_flow_dissector_load_bytes,
1753 const struct bpf_flow_dissector *, ctx, u32, offset,
1754 void *, to, u32, len)
1758 if (unlikely(offset > 0xffff))
1761 if (unlikely(!ctx->skb))
1764 ptr = skb_header_pointer(ctx->skb, offset, len, to);
1768 memcpy(to, ptr, len);
1776 static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto = {
1777 .func = bpf_flow_dissector_load_bytes,
1779 .ret_type = RET_INTEGER,
1780 .arg1_type = ARG_PTR_TO_CTX,
1781 .arg2_type = ARG_ANYTHING,
1782 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
1783 .arg4_type = ARG_CONST_SIZE,
1786 BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb,
1787 u32, offset, void *, to, u32, len, u32, start_header)
1789 u8 *end = skb_tail_pointer(skb);
1792 if (unlikely(offset > 0xffff))
1795 switch (start_header) {
1796 case BPF_HDR_START_MAC:
1797 if (unlikely(!skb_mac_header_was_set(skb)))
1799 start = skb_mac_header(skb);
1801 case BPF_HDR_START_NET:
1802 start = skb_network_header(skb);
1808 ptr = start + offset;
1810 if (likely(ptr + len <= end)) {
1811 memcpy(to, ptr, len);
1820 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = {
1821 .func = bpf_skb_load_bytes_relative,
1823 .ret_type = RET_INTEGER,
1824 .arg1_type = ARG_PTR_TO_CTX,
1825 .arg2_type = ARG_ANYTHING,
1826 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
1827 .arg4_type = ARG_CONST_SIZE,
1828 .arg5_type = ARG_ANYTHING,
1831 BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len)
1833 /* Idea is the following: should the needed direct read/write
1834 * test fail during runtime, we can pull in more data and redo
1835 * again, since implicitly, we invalidate previous checks here.
1837 * Or, since we know how much we need to make read/writeable,
1838 * this can be done once at the program beginning for direct
1839 * access case. By this we overcome limitations of only current
1840 * headroom being accessible.
1842 return bpf_try_make_writable(skb, len ? : skb_headlen(skb));
1845 static const struct bpf_func_proto bpf_skb_pull_data_proto = {
1846 .func = bpf_skb_pull_data,
1848 .ret_type = RET_INTEGER,
1849 .arg1_type = ARG_PTR_TO_CTX,
1850 .arg2_type = ARG_ANYTHING,
1853 BPF_CALL_1(bpf_sk_fullsock, struct sock *, sk)
1855 return sk_fullsock(sk) ? (unsigned long)sk : (unsigned long)NULL;
1858 static const struct bpf_func_proto bpf_sk_fullsock_proto = {
1859 .func = bpf_sk_fullsock,
1861 .ret_type = RET_PTR_TO_SOCKET_OR_NULL,
1862 .arg1_type = ARG_PTR_TO_SOCK_COMMON,
1865 static inline int sk_skb_try_make_writable(struct sk_buff *skb,
1866 unsigned int write_len)
1868 return __bpf_try_make_writable(skb, write_len);
1871 BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len)
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.
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.
1882 return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb));
1885 static const struct bpf_func_proto sk_skb_pull_data_proto = {
1886 .func = sk_skb_pull_data,
1888 .ret_type = RET_INTEGER,
1889 .arg1_type = ARG_PTR_TO_CTX,
1890 .arg2_type = ARG_ANYTHING,
1893 BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset,
1894 u64, from, u64, to, u64, flags)
1898 if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK)))
1900 if (unlikely(offset > 0xffff || offset & 1))
1902 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
1905 ptr = (__sum16 *)(skb->data + offset);
1906 switch (flags & BPF_F_HDR_FIELD_MASK) {
1908 if (unlikely(from != 0))
1911 csum_replace_by_diff(ptr, to);
1914 csum_replace2(ptr, from, to);
1917 csum_replace4(ptr, from, to);
1926 static const struct bpf_func_proto bpf_l3_csum_replace_proto = {
1927 .func = bpf_l3_csum_replace,
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,
1937 BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset,
1938 u64, from, u64, to, u64, flags)
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;
1945 if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE |
1946 BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK)))
1948 if (unlikely(offset > 0xffff || offset & 1))
1950 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
1953 ptr = (__sum16 *)(skb->data + offset);
1954 if (is_mmzero && !do_mforce && !*ptr)
1957 switch (flags & BPF_F_HDR_FIELD_MASK) {
1959 if (unlikely(from != 0))
1962 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo);
1965 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo);
1968 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo);
1974 if (is_mmzero && !*ptr)
1975 *ptr = CSUM_MANGLED_0;
1979 static const struct bpf_func_proto bpf_l4_csum_replace_proto = {
1980 .func = bpf_l4_csum_replace,
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,
1990 BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size,
1991 __be32 *, to, u32, to_size, __wsum, seed)
1993 struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp);
1994 u32 diff_size = from_size + to_size;
1997 /* This is quite flexible, some examples:
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
2003 * Even for diffing, from_size and to_size don't need to be equal.
2005 if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) ||
2006 diff_size > sizeof(sp->diff)))
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];
2014 return csum_partial(sp->diff, diff_size, seed);
2017 static const struct bpf_func_proto bpf_csum_diff_proto = {
2018 .func = bpf_csum_diff,
2021 .ret_type = RET_INTEGER,
2022 .arg1_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY,
2023 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
2024 .arg3_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY,
2025 .arg4_type = ARG_CONST_SIZE_OR_ZERO,
2026 .arg5_type = ARG_ANYTHING,
2029 BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum)
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.
2035 if (skb->ip_summed == CHECKSUM_COMPLETE)
2036 return (skb->csum = csum_add(skb->csum, csum));
2041 static const struct bpf_func_proto bpf_csum_update_proto = {
2042 .func = bpf_csum_update,
2044 .ret_type = RET_INTEGER,
2045 .arg1_type = ARG_PTR_TO_CTX,
2046 .arg2_type = ARG_ANYTHING,
2049 BPF_CALL_2(bpf_csum_level, struct sk_buff *, skb, u64, level)
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.
2056 case BPF_CSUM_LEVEL_INC:
2057 __skb_incr_checksum_unnecessary(skb);
2059 case BPF_CSUM_LEVEL_DEC:
2060 __skb_decr_checksum_unnecessary(skb);
2062 case BPF_CSUM_LEVEL_RESET:
2063 __skb_reset_checksum_unnecessary(skb);
2065 case BPF_CSUM_LEVEL_QUERY:
2066 return skb->ip_summed == CHECKSUM_UNNECESSARY ?
2067 skb->csum_level : -EACCES;
2075 static const struct bpf_func_proto bpf_csum_level_proto = {
2076 .func = bpf_csum_level,
2078 .ret_type = RET_INTEGER,
2079 .arg1_type = ARG_PTR_TO_CTX,
2080 .arg2_type = ARG_ANYTHING,
2083 static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb)
2085 return dev_forward_skb_nomtu(dev, skb);
2088 static inline int __bpf_rx_skb_no_mac(struct net_device *dev,
2089 struct sk_buff *skb)
2091 int ret = ____dev_forward_skb(dev, skb, false);
2095 ret = netif_rx(skb);
2101 static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb)
2105 if (dev_xmit_recursion()) {
2106 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2112 skb_clear_tstamp(skb);
2114 dev_xmit_recursion_inc();
2115 ret = dev_queue_xmit(skb);
2116 dev_xmit_recursion_dec();
2121 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev,
2124 unsigned int mlen = skb_network_offset(skb);
2127 __skb_pull(skb, mlen);
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.
2134 if (!skb_at_tc_ingress(skb))
2135 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen);
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);
2143 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev,
2146 /* Verify that a link layer header is carried */
2147 if (unlikely(skb->mac_header >= skb->network_header)) {
2152 bpf_push_mac_rcsum(skb);
2153 return flags & BPF_F_INGRESS ?
2154 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb);
2157 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev,
2160 if (dev_is_mac_header_xmit(dev))
2161 return __bpf_redirect_common(skb, dev, flags);
2163 return __bpf_redirect_no_mac(skb, dev, flags);
2166 #if IS_ENABLED(CONFIG_IPV6)
2167 static int bpf_out_neigh_v6(struct net *net, struct sk_buff *skb,
2168 struct net_device *dev, struct bpf_nh_params *nh)
2170 u32 hh_len = LL_RESERVED_SPACE(dev);
2171 const struct in6_addr *nexthop;
2172 struct dst_entry *dst = NULL;
2173 struct neighbour *neigh;
2175 if (dev_xmit_recursion()) {
2176 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2181 skb_clear_tstamp(skb);
2183 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
2184 skb = skb_expand_head(skb, hh_len);
2192 nexthop = rt6_nexthop(container_of(dst, struct rt6_info, dst),
2193 &ipv6_hdr(skb)->daddr);
2195 nexthop = &nh->ipv6_nh;
2197 neigh = ip_neigh_gw6(dev, nexthop);
2198 if (likely(!IS_ERR(neigh))) {
2201 sock_confirm_neigh(skb, neigh);
2202 dev_xmit_recursion_inc();
2203 ret = neigh_output(neigh, skb, false);
2204 dev_xmit_recursion_dec();
2205 rcu_read_unlock_bh();
2208 rcu_read_unlock_bh();
2210 IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
2216 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev,
2217 struct bpf_nh_params *nh)
2219 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
2220 struct net *net = dev_net(dev);
2221 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,
2235 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL);
2239 skb_dst_set(skb, dst);
2240 } else if (nh->nh_family != AF_INET6) {
2244 err = bpf_out_neigh_v6(net, skb, dev, nh);
2245 if (unlikely(net_xmit_eval(err)))
2246 dev->stats.tx_errors++;
2248 ret = NET_XMIT_SUCCESS;
2251 dev->stats.tx_errors++;
2257 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev,
2258 struct bpf_nh_params *nh)
2261 return NET_XMIT_DROP;
2263 #endif /* CONFIG_IPV6 */
2265 #if IS_ENABLED(CONFIG_INET)
2266 static int bpf_out_neigh_v4(struct net *net, struct sk_buff *skb,
2267 struct net_device *dev, struct bpf_nh_params *nh)
2269 u32 hh_len = LL_RESERVED_SPACE(dev);
2270 struct neighbour *neigh;
2271 bool is_v6gw = false;
2273 if (dev_xmit_recursion()) {
2274 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2279 skb_clear_tstamp(skb);
2281 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
2282 skb = skb_expand_head(skb, hh_len);
2289 struct dst_entry *dst = skb_dst(skb);
2290 struct rtable *rt = container_of(dst, struct rtable, dst);
2292 neigh = ip_neigh_for_gw(rt, skb, &is_v6gw);
2293 } else if (nh->nh_family == AF_INET6) {
2294 neigh = ip_neigh_gw6(dev, &nh->ipv6_nh);
2296 } else if (nh->nh_family == AF_INET) {
2297 neigh = ip_neigh_gw4(dev, nh->ipv4_nh);
2299 rcu_read_unlock_bh();
2303 if (likely(!IS_ERR(neigh))) {
2306 sock_confirm_neigh(skb, neigh);
2307 dev_xmit_recursion_inc();
2308 ret = neigh_output(neigh, skb, is_v6gw);
2309 dev_xmit_recursion_dec();
2310 rcu_read_unlock_bh();
2313 rcu_read_unlock_bh();
2319 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev,
2320 struct bpf_nh_params *nh)
2322 const struct iphdr *ip4h = ip_hdr(skb);
2323 struct net *net = dev_net(dev);
2324 int err, ret = NET_XMIT_DROP;
2327 struct flowi4 fl4 = {
2328 .flowi4_flags = FLOWI_FLAG_ANYSRC,
2329 .flowi4_mark = skb->mark,
2330 .flowi4_tos = RT_TOS(ip4h->tos),
2331 .flowi4_oif = dev->ifindex,
2332 .flowi4_proto = ip4h->protocol,
2333 .daddr = ip4h->daddr,
2334 .saddr = ip4h->saddr,
2338 rt = ip_route_output_flow(net, &fl4, NULL);
2341 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
2346 skb_dst_set(skb, &rt->dst);
2349 err = bpf_out_neigh_v4(net, skb, dev, nh);
2350 if (unlikely(net_xmit_eval(err)))
2351 dev->stats.tx_errors++;
2353 ret = NET_XMIT_SUCCESS;
2356 dev->stats.tx_errors++;
2362 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev,
2363 struct bpf_nh_params *nh)
2366 return NET_XMIT_DROP;
2368 #endif /* CONFIG_INET */
2370 static int __bpf_redirect_neigh(struct sk_buff *skb, struct net_device *dev,
2371 struct bpf_nh_params *nh)
2373 struct ethhdr *ethh = eth_hdr(skb);
2375 if (unlikely(skb->mac_header >= skb->network_header))
2377 bpf_push_mac_rcsum(skb);
2378 if (is_multicast_ether_addr(ethh->h_dest))
2381 skb_pull(skb, sizeof(*ethh));
2382 skb_unset_mac_header(skb);
2383 skb_reset_network_header(skb);
2385 if (skb->protocol == htons(ETH_P_IP))
2386 return __bpf_redirect_neigh_v4(skb, dev, nh);
2387 else if (skb->protocol == htons(ETH_P_IPV6))
2388 return __bpf_redirect_neigh_v6(skb, dev, nh);
2394 /* Internal, non-exposed redirect flags. */
2396 BPF_F_NEIGH = (1ULL << 1),
2397 BPF_F_PEER = (1ULL << 2),
2398 BPF_F_NEXTHOP = (1ULL << 3),
2399 #define BPF_F_REDIRECT_INTERNAL (BPF_F_NEIGH | BPF_F_PEER | BPF_F_NEXTHOP)
2402 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags)
2404 struct net_device *dev;
2405 struct sk_buff *clone;
2408 if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL)))
2411 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex);
2415 clone = skb_clone(skb, GFP_ATOMIC);
2416 if (unlikely(!clone))
2419 /* For direct write, we need to keep the invariant that the skbs
2420 * we're dealing with need to be uncloned. Should uncloning fail
2421 * here, we need to free the just generated clone to unclone once
2424 ret = bpf_try_make_head_writable(skb);
2425 if (unlikely(ret)) {
2430 return __bpf_redirect(clone, dev, flags);
2433 static const struct bpf_func_proto bpf_clone_redirect_proto = {
2434 .func = bpf_clone_redirect,
2436 .ret_type = RET_INTEGER,
2437 .arg1_type = ARG_PTR_TO_CTX,
2438 .arg2_type = ARG_ANYTHING,
2439 .arg3_type = ARG_ANYTHING,
2442 DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info);
2443 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info);
2445 int skb_do_redirect(struct sk_buff *skb)
2447 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
2448 struct net *net = dev_net(skb->dev);
2449 struct net_device *dev;
2450 u32 flags = ri->flags;
2452 dev = dev_get_by_index_rcu(net, ri->tgt_index);
2457 if (flags & BPF_F_PEER) {
2458 const struct net_device_ops *ops = dev->netdev_ops;
2460 if (unlikely(!ops->ndo_get_peer_dev ||
2461 !skb_at_tc_ingress(skb)))
2463 dev = ops->ndo_get_peer_dev(dev);
2464 if (unlikely(!dev ||
2465 !(dev->flags & IFF_UP) ||
2466 net_eq(net, dev_net(dev))))
2471 return flags & BPF_F_NEIGH ?
2472 __bpf_redirect_neigh(skb, dev, flags & BPF_F_NEXTHOP ?
2474 __bpf_redirect(skb, dev, flags);
2480 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags)
2482 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
2484 if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL)))
2488 ri->tgt_index = ifindex;
2490 return TC_ACT_REDIRECT;
2493 static const struct bpf_func_proto bpf_redirect_proto = {
2494 .func = bpf_redirect,
2496 .ret_type = RET_INTEGER,
2497 .arg1_type = ARG_ANYTHING,
2498 .arg2_type = ARG_ANYTHING,
2501 BPF_CALL_2(bpf_redirect_peer, u32, ifindex, u64, flags)
2503 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
2505 if (unlikely(flags))
2508 ri->flags = BPF_F_PEER;
2509 ri->tgt_index = ifindex;
2511 return TC_ACT_REDIRECT;
2514 static const struct bpf_func_proto bpf_redirect_peer_proto = {
2515 .func = bpf_redirect_peer,
2517 .ret_type = RET_INTEGER,
2518 .arg1_type = ARG_ANYTHING,
2519 .arg2_type = ARG_ANYTHING,
2522 BPF_CALL_4(bpf_redirect_neigh, u32, ifindex, struct bpf_redir_neigh *, params,
2523 int, plen, u64, flags)
2525 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
2527 if (unlikely((plen && plen < sizeof(*params)) || flags))
2530 ri->flags = BPF_F_NEIGH | (plen ? BPF_F_NEXTHOP : 0);
2531 ri->tgt_index = ifindex;
2533 BUILD_BUG_ON(sizeof(struct bpf_redir_neigh) != sizeof(struct bpf_nh_params));
2535 memcpy(&ri->nh, params, sizeof(ri->nh));
2537 return TC_ACT_REDIRECT;
2540 static const struct bpf_func_proto bpf_redirect_neigh_proto = {
2541 .func = bpf_redirect_neigh,
2543 .ret_type = RET_INTEGER,
2544 .arg1_type = ARG_ANYTHING,
2545 .arg2_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY,
2546 .arg3_type = ARG_CONST_SIZE_OR_ZERO,
2547 .arg4_type = ARG_ANYTHING,
2550 BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes)
2552 msg->apply_bytes = bytes;
2556 static const struct bpf_func_proto bpf_msg_apply_bytes_proto = {
2557 .func = bpf_msg_apply_bytes,
2559 .ret_type = RET_INTEGER,
2560 .arg1_type = ARG_PTR_TO_CTX,
2561 .arg2_type = ARG_ANYTHING,
2564 BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes)
2566 msg->cork_bytes = bytes;
2570 static const struct bpf_func_proto bpf_msg_cork_bytes_proto = {
2571 .func = bpf_msg_cork_bytes,
2573 .ret_type = RET_INTEGER,
2574 .arg1_type = ARG_PTR_TO_CTX,
2575 .arg2_type = ARG_ANYTHING,
2578 BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start,
2579 u32, end, u64, flags)
2581 u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start;
2582 u32 first_sge, last_sge, i, shift, bytes_sg_total;
2583 struct scatterlist *sge;
2584 u8 *raw, *to, *from;
2587 if (unlikely(flags || end <= start))
2590 /* First find the starting scatterlist element */
2594 len = sk_msg_elem(msg, i)->length;
2595 if (start < offset + len)
2597 sk_msg_iter_var_next(i);
2598 } while (i != msg->sg.end);
2600 if (unlikely(start >= offset + len))
2604 /* The start may point into the sg element so we need to also
2605 * account for the headroom.
2607 bytes_sg_total = start - offset + bytes;
2608 if (!test_bit(i, msg->sg.copy) && bytes_sg_total <= len)
2611 /* At this point we need to linearize multiple scatterlist
2612 * elements or a single shared page. Either way we need to
2613 * copy into a linear buffer exclusively owned by BPF. Then
2614 * place the buffer in the scatterlist and fixup the original
2615 * entries by removing the entries now in the linear buffer
2616 * and shifting the remaining entries. For now we do not try
2617 * to copy partial entries to avoid complexity of running out
2618 * of sg_entry slots. The downside is reading a single byte
2619 * will copy the entire sg entry.
2622 copy += sk_msg_elem(msg, i)->length;
2623 sk_msg_iter_var_next(i);
2624 if (bytes_sg_total <= copy)
2626 } while (i != msg->sg.end);
2629 if (unlikely(bytes_sg_total > copy))
2632 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP,
2634 if (unlikely(!page))
2637 raw = page_address(page);
2640 sge = sk_msg_elem(msg, i);
2641 from = sg_virt(sge);
2645 memcpy(to, from, len);
2648 put_page(sg_page(sge));
2650 sk_msg_iter_var_next(i);
2651 } while (i != last_sge);
2653 sg_set_page(&msg->sg.data[first_sge], page, copy, 0);
2655 /* To repair sg ring we need to shift entries. If we only
2656 * had a single entry though we can just replace it and
2657 * be done. Otherwise walk the ring and shift the entries.
2659 WARN_ON_ONCE(last_sge == first_sge);
2660 shift = last_sge > first_sge ?
2661 last_sge - first_sge - 1 :
2662 NR_MSG_FRAG_IDS - first_sge + last_sge - 1;
2667 sk_msg_iter_var_next(i);
2671 if (i + shift >= NR_MSG_FRAG_IDS)
2672 move_from = i + shift - NR_MSG_FRAG_IDS;
2674 move_from = i + shift;
2675 if (move_from == msg->sg.end)
2678 msg->sg.data[i] = msg->sg.data[move_from];
2679 msg->sg.data[move_from].length = 0;
2680 msg->sg.data[move_from].page_link = 0;
2681 msg->sg.data[move_from].offset = 0;
2682 sk_msg_iter_var_next(i);
2685 msg->sg.end = msg->sg.end - shift > msg->sg.end ?
2686 msg->sg.end - shift + NR_MSG_FRAG_IDS :
2687 msg->sg.end - shift;
2689 msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset;
2690 msg->data_end = msg->data + bytes;
2694 static const struct bpf_func_proto bpf_msg_pull_data_proto = {
2695 .func = bpf_msg_pull_data,
2697 .ret_type = RET_INTEGER,
2698 .arg1_type = ARG_PTR_TO_CTX,
2699 .arg2_type = ARG_ANYTHING,
2700 .arg3_type = ARG_ANYTHING,
2701 .arg4_type = ARG_ANYTHING,
2704 BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start,
2705 u32, len, u64, flags)
2707 struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge;
2708 u32 new, i = 0, l = 0, space, copy = 0, offset = 0;
2709 u8 *raw, *to, *from;
2712 if (unlikely(flags))
2715 if (unlikely(len == 0))
2718 /* First find the starting scatterlist element */
2722 l = sk_msg_elem(msg, i)->length;
2724 if (start < offset + l)
2726 sk_msg_iter_var_next(i);
2727 } while (i != msg->sg.end);
2729 if (start >= offset + l)
2732 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg);
2734 /* If no space available will fallback to copy, we need at
2735 * least one scatterlist elem available to push data into
2736 * when start aligns to the beginning of an element or two
2737 * when it falls inside an element. We handle the start equals
2738 * offset case because its the common case for inserting a
2741 if (!space || (space == 1 && start != offset))
2742 copy = msg->sg.data[i].length;
2744 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP,
2745 get_order(copy + len));
2746 if (unlikely(!page))
2752 raw = page_address(page);
2754 psge = sk_msg_elem(msg, i);
2755 front = start - offset;
2756 back = psge->length - front;
2757 from = sg_virt(psge);
2760 memcpy(raw, from, front);
2764 to = raw + front + len;
2766 memcpy(to, from, back);
2769 put_page(sg_page(psge));
2770 } else if (start - offset) {
2771 psge = sk_msg_elem(msg, i);
2772 rsge = sk_msg_elem_cpy(msg, i);
2774 psge->length = start - offset;
2775 rsge.length -= psge->length;
2776 rsge.offset += start;
2778 sk_msg_iter_var_next(i);
2779 sg_unmark_end(psge);
2780 sg_unmark_end(&rsge);
2781 sk_msg_iter_next(msg, end);
2784 /* Slot(s) to place newly allocated data */
2787 /* Shift one or two slots as needed */
2789 sge = sk_msg_elem_cpy(msg, i);
2791 sk_msg_iter_var_next(i);
2792 sg_unmark_end(&sge);
2793 sk_msg_iter_next(msg, end);
2795 nsge = sk_msg_elem_cpy(msg, i);
2797 sk_msg_iter_var_next(i);
2798 nnsge = sk_msg_elem_cpy(msg, i);
2801 while (i != msg->sg.end) {
2802 msg->sg.data[i] = sge;
2804 sk_msg_iter_var_next(i);
2807 nnsge = sk_msg_elem_cpy(msg, i);
2809 nsge = sk_msg_elem_cpy(msg, i);
2814 /* Place newly allocated data buffer */
2815 sk_mem_charge(msg->sk, len);
2816 msg->sg.size += len;
2817 __clear_bit(new, msg->sg.copy);
2818 sg_set_page(&msg->sg.data[new], page, len + copy, 0);
2820 get_page(sg_page(&rsge));
2821 sk_msg_iter_var_next(new);
2822 msg->sg.data[new] = rsge;
2825 sk_msg_compute_data_pointers(msg);
2829 static const struct bpf_func_proto bpf_msg_push_data_proto = {
2830 .func = bpf_msg_push_data,
2832 .ret_type = RET_INTEGER,
2833 .arg1_type = ARG_PTR_TO_CTX,
2834 .arg2_type = ARG_ANYTHING,
2835 .arg3_type = ARG_ANYTHING,
2836 .arg4_type = ARG_ANYTHING,
2839 static void sk_msg_shift_left(struct sk_msg *msg, int i)
2845 sk_msg_iter_var_next(i);
2846 msg->sg.data[prev] = msg->sg.data[i];
2847 } while (i != msg->sg.end);
2849 sk_msg_iter_prev(msg, end);
2852 static void sk_msg_shift_right(struct sk_msg *msg, int i)
2854 struct scatterlist tmp, sge;
2856 sk_msg_iter_next(msg, end);
2857 sge = sk_msg_elem_cpy(msg, i);
2858 sk_msg_iter_var_next(i);
2859 tmp = sk_msg_elem_cpy(msg, i);
2861 while (i != msg->sg.end) {
2862 msg->sg.data[i] = sge;
2863 sk_msg_iter_var_next(i);
2865 tmp = sk_msg_elem_cpy(msg, i);
2869 BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start,
2870 u32, len, u64, flags)
2872 u32 i = 0, l = 0, space, offset = 0;
2873 u64 last = start + len;
2876 if (unlikely(flags))
2879 /* First find the starting scatterlist element */
2883 l = sk_msg_elem(msg, i)->length;
2885 if (start < offset + l)
2887 sk_msg_iter_var_next(i);
2888 } while (i != msg->sg.end);
2890 /* Bounds checks: start and pop must be inside message */
2891 if (start >= offset + l || last >= msg->sg.size)
2894 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg);
2897 /* --------------| offset
2898 * -| start |-------- len -------|
2900 * |----- a ----|-------- pop -------|----- b ----|
2901 * |______________________________________________| length
2904 * a: region at front of scatter element to save
2905 * b: region at back of scatter element to save when length > A + pop
2906 * pop: region to pop from element, same as input 'pop' here will be
2907 * decremented below per iteration.
2909 * Two top-level cases to handle when start != offset, first B is non
2910 * zero and second B is zero corresponding to when a pop includes more
2913 * Then if B is non-zero AND there is no space allocate space and
2914 * compact A, B regions into page. If there is space shift ring to
2915 * the rigth free'ing the next element in ring to place B, leaving
2916 * A untouched except to reduce length.
2918 if (start != offset) {
2919 struct scatterlist *nsge, *sge = sk_msg_elem(msg, i);
2921 int b = sge->length - pop - a;
2923 sk_msg_iter_var_next(i);
2925 if (pop < sge->length - a) {
2928 sk_msg_shift_right(msg, i);
2929 nsge = sk_msg_elem(msg, i);
2930 get_page(sg_page(sge));
2933 b, sge->offset + pop + a);
2935 struct page *page, *orig;
2938 page = alloc_pages(__GFP_NOWARN |
2939 __GFP_COMP | GFP_ATOMIC,
2941 if (unlikely(!page))
2945 orig = sg_page(sge);
2946 from = sg_virt(sge);
2947 to = page_address(page);
2948 memcpy(to, from, a);
2949 memcpy(to + a, from + a + pop, b);
2950 sg_set_page(sge, page, a + b, 0);
2954 } else if (pop >= sge->length - a) {
2955 pop -= (sge->length - a);
2960 /* From above the current layout _must_ be as follows,
2965 * |---- pop ---|---------------- b ------------|
2966 * |____________________________________________| length
2968 * Offset and start of the current msg elem are equal because in the
2969 * previous case we handled offset != start and either consumed the
2970 * entire element and advanced to the next element OR pop == 0.
2972 * Two cases to handle here are first pop is less than the length
2973 * leaving some remainder b above. Simply adjust the element's layout
2974 * in this case. Or pop >= length of the element so that b = 0. In this
2975 * case advance to next element decrementing pop.
2978 struct scatterlist *sge = sk_msg_elem(msg, i);
2980 if (pop < sge->length) {
2986 sk_msg_shift_left(msg, i);
2988 sk_msg_iter_var_next(i);
2991 sk_mem_uncharge(msg->sk, len - pop);
2992 msg->sg.size -= (len - pop);
2993 sk_msg_compute_data_pointers(msg);
2997 static const struct bpf_func_proto bpf_msg_pop_data_proto = {
2998 .func = bpf_msg_pop_data,
3000 .ret_type = RET_INTEGER,
3001 .arg1_type = ARG_PTR_TO_CTX,
3002 .arg2_type = ARG_ANYTHING,
3003 .arg3_type = ARG_ANYTHING,
3004 .arg4_type = ARG_ANYTHING,
3007 #ifdef CONFIG_CGROUP_NET_CLASSID
3008 BPF_CALL_0(bpf_get_cgroup_classid_curr)
3010 return __task_get_classid(current);
3013 const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto = {
3014 .func = bpf_get_cgroup_classid_curr,
3016 .ret_type = RET_INTEGER,
3019 BPF_CALL_1(bpf_skb_cgroup_classid, const struct sk_buff *, skb)
3021 struct sock *sk = skb_to_full_sk(skb);
3023 if (!sk || !sk_fullsock(sk))
3026 return sock_cgroup_classid(&sk->sk_cgrp_data);
3029 static const struct bpf_func_proto bpf_skb_cgroup_classid_proto = {
3030 .func = bpf_skb_cgroup_classid,
3032 .ret_type = RET_INTEGER,
3033 .arg1_type = ARG_PTR_TO_CTX,
3037 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb)
3039 return task_get_classid(skb);
3042 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = {
3043 .func = bpf_get_cgroup_classid,
3045 .ret_type = RET_INTEGER,
3046 .arg1_type = ARG_PTR_TO_CTX,
3049 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb)
3051 return dst_tclassid(skb);
3054 static const struct bpf_func_proto bpf_get_route_realm_proto = {
3055 .func = bpf_get_route_realm,
3057 .ret_type = RET_INTEGER,
3058 .arg1_type = ARG_PTR_TO_CTX,
3061 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb)
3063 /* If skb_clear_hash() was called due to mangling, we can
3064 * trigger SW recalculation here. Later access to hash
3065 * can then use the inline skb->hash via context directly
3066 * instead of calling this helper again.
3068 return skb_get_hash(skb);
3071 static const struct bpf_func_proto bpf_get_hash_recalc_proto = {
3072 .func = bpf_get_hash_recalc,
3074 .ret_type = RET_INTEGER,
3075 .arg1_type = ARG_PTR_TO_CTX,
3078 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb)
3080 /* After all direct packet write, this can be used once for
3081 * triggering a lazy recalc on next skb_get_hash() invocation.
3083 skb_clear_hash(skb);
3087 static const struct bpf_func_proto bpf_set_hash_invalid_proto = {
3088 .func = bpf_set_hash_invalid,
3090 .ret_type = RET_INTEGER,
3091 .arg1_type = ARG_PTR_TO_CTX,
3094 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash)
3096 /* Set user specified hash as L4(+), so that it gets returned
3097 * on skb_get_hash() call unless BPF prog later on triggers a
3100 __skb_set_sw_hash(skb, hash, true);
3104 static const struct bpf_func_proto bpf_set_hash_proto = {
3105 .func = bpf_set_hash,
3107 .ret_type = RET_INTEGER,
3108 .arg1_type = ARG_PTR_TO_CTX,
3109 .arg2_type = ARG_ANYTHING,
3112 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto,
3117 if (unlikely(vlan_proto != htons(ETH_P_8021Q) &&
3118 vlan_proto != htons(ETH_P_8021AD)))
3119 vlan_proto = htons(ETH_P_8021Q);
3121 bpf_push_mac_rcsum(skb);
3122 ret = skb_vlan_push(skb, vlan_proto, vlan_tci);
3123 bpf_pull_mac_rcsum(skb);
3125 bpf_compute_data_pointers(skb);
3129 static const struct bpf_func_proto bpf_skb_vlan_push_proto = {
3130 .func = bpf_skb_vlan_push,
3132 .ret_type = RET_INTEGER,
3133 .arg1_type = ARG_PTR_TO_CTX,
3134 .arg2_type = ARG_ANYTHING,
3135 .arg3_type = ARG_ANYTHING,
3138 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb)
3142 bpf_push_mac_rcsum(skb);
3143 ret = skb_vlan_pop(skb);
3144 bpf_pull_mac_rcsum(skb);
3146 bpf_compute_data_pointers(skb);
3150 static const struct bpf_func_proto bpf_skb_vlan_pop_proto = {
3151 .func = bpf_skb_vlan_pop,
3153 .ret_type = RET_INTEGER,
3154 .arg1_type = ARG_PTR_TO_CTX,
3157 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len)
3159 /* Caller already did skb_cow() with len as headroom,
3160 * so no need to do it here.
3163 memmove(skb->data, skb->data + len, off);
3164 memset(skb->data + off, 0, len);
3166 /* No skb_postpush_rcsum(skb, skb->data + off, len)
3167 * needed here as it does not change the skb->csum
3168 * result for checksum complete when summing over
3174 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len)
3176 /* skb_ensure_writable() is not needed here, as we're
3177 * already working on an uncloned skb.
3179 if (unlikely(!pskb_may_pull(skb, off + len)))
3182 skb_postpull_rcsum(skb, skb->data + off, len);
3183 memmove(skb->data + len, skb->data, off);
3184 __skb_pull(skb, len);
3189 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len)
3191 bool trans_same = skb->transport_header == skb->network_header;
3194 /* There's no need for __skb_push()/__skb_pull() pair to
3195 * get to the start of the mac header as we're guaranteed
3196 * to always start from here under eBPF.
3198 ret = bpf_skb_generic_push(skb, off, len);
3200 skb->mac_header -= len;
3201 skb->network_header -= len;
3203 skb->transport_header = skb->network_header;
3209 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len)
3211 bool trans_same = skb->transport_header == skb->network_header;
3214 /* Same here, __skb_push()/__skb_pull() pair not needed. */
3215 ret = bpf_skb_generic_pop(skb, off, len);
3217 skb->mac_header += len;
3218 skb->network_header += len;
3220 skb->transport_header = skb->network_header;
3226 static int bpf_skb_proto_4_to_6(struct sk_buff *skb)
3228 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
3229 u32 off = skb_mac_header_len(skb);
3232 ret = skb_cow(skb, len_diff);
3233 if (unlikely(ret < 0))
3236 ret = bpf_skb_net_hdr_push(skb, off, len_diff);
3237 if (unlikely(ret < 0))
3240 if (skb_is_gso(skb)) {
3241 struct skb_shared_info *shinfo = skb_shinfo(skb);
3243 /* SKB_GSO_TCPV4 needs to be changed into SKB_GSO_TCPV6. */
3244 if (shinfo->gso_type & SKB_GSO_TCPV4) {
3245 shinfo->gso_type &= ~SKB_GSO_TCPV4;
3246 shinfo->gso_type |= SKB_GSO_TCPV6;
3250 skb->protocol = htons(ETH_P_IPV6);
3251 skb_clear_hash(skb);
3256 static int bpf_skb_proto_6_to_4(struct sk_buff *skb)
3258 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
3259 u32 off = skb_mac_header_len(skb);
3262 ret = skb_unclone(skb, GFP_ATOMIC);
3263 if (unlikely(ret < 0))
3266 ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
3267 if (unlikely(ret < 0))
3270 if (skb_is_gso(skb)) {
3271 struct skb_shared_info *shinfo = skb_shinfo(skb);
3273 /* SKB_GSO_TCPV6 needs to be changed into SKB_GSO_TCPV4. */
3274 if (shinfo->gso_type & SKB_GSO_TCPV6) {
3275 shinfo->gso_type &= ~SKB_GSO_TCPV6;
3276 shinfo->gso_type |= SKB_GSO_TCPV4;
3280 skb->protocol = htons(ETH_P_IP);
3281 skb_clear_hash(skb);
3286 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto)
3288 __be16 from_proto = skb->protocol;
3290 if (from_proto == htons(ETH_P_IP) &&
3291 to_proto == htons(ETH_P_IPV6))
3292 return bpf_skb_proto_4_to_6(skb);
3294 if (from_proto == htons(ETH_P_IPV6) &&
3295 to_proto == htons(ETH_P_IP))
3296 return bpf_skb_proto_6_to_4(skb);
3301 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto,
3306 if (unlikely(flags))
3309 /* General idea is that this helper does the basic groundwork
3310 * needed for changing the protocol, and eBPF program fills the
3311 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace()
3312 * and other helpers, rather than passing a raw buffer here.
3314 * The rationale is to keep this minimal and without a need to
3315 * deal with raw packet data. F.e. even if we would pass buffers
3316 * here, the program still needs to call the bpf_lX_csum_replace()
3317 * helpers anyway. Plus, this way we keep also separation of
3318 * concerns, since f.e. bpf_skb_store_bytes() should only take
3321 * Currently, additional options and extension header space are
3322 * not supported, but flags register is reserved so we can adapt
3323 * that. For offloads, we mark packet as dodgy, so that headers
3324 * need to be verified first.
3326 ret = bpf_skb_proto_xlat(skb, proto);
3327 bpf_compute_data_pointers(skb);
3331 static const struct bpf_func_proto bpf_skb_change_proto_proto = {
3332 .func = bpf_skb_change_proto,
3334 .ret_type = RET_INTEGER,
3335 .arg1_type = ARG_PTR_TO_CTX,
3336 .arg2_type = ARG_ANYTHING,
3337 .arg3_type = ARG_ANYTHING,
3340 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type)
3342 /* We only allow a restricted subset to be changed for now. */
3343 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) ||
3344 !skb_pkt_type_ok(pkt_type)))
3347 skb->pkt_type = pkt_type;
3351 static const struct bpf_func_proto bpf_skb_change_type_proto = {
3352 .func = bpf_skb_change_type,
3354 .ret_type = RET_INTEGER,
3355 .arg1_type = ARG_PTR_TO_CTX,
3356 .arg2_type = ARG_ANYTHING,
3359 static u32 bpf_skb_net_base_len(const struct sk_buff *skb)
3361 switch (skb->protocol) {
3362 case htons(ETH_P_IP):
3363 return sizeof(struct iphdr);
3364 case htons(ETH_P_IPV6):
3365 return sizeof(struct ipv6hdr);
3371 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \
3372 BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3374 #define BPF_F_ADJ_ROOM_MASK (BPF_F_ADJ_ROOM_FIXED_GSO | \
3375 BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \
3376 BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \
3377 BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \
3378 BPF_F_ADJ_ROOM_ENCAP_L2_ETH | \
3379 BPF_F_ADJ_ROOM_ENCAP_L2( \
3380 BPF_ADJ_ROOM_ENCAP_L2_MASK))
3382 static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff,
3385 u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT;
3386 bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK;
3387 u16 mac_len = 0, inner_net = 0, inner_trans = 0;
3388 unsigned int gso_type = SKB_GSO_DODGY;
3391 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) {
3392 /* udp gso_size delineates datagrams, only allow if fixed */
3393 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) ||
3394 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3398 ret = skb_cow_head(skb, len_diff);
3399 if (unlikely(ret < 0))
3403 if (skb->protocol != htons(ETH_P_IP) &&
3404 skb->protocol != htons(ETH_P_IPV6))
3407 if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 &&
3408 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3411 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE &&
3412 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP)
3415 if (flags & BPF_F_ADJ_ROOM_ENCAP_L2_ETH &&
3416 inner_mac_len < ETH_HLEN)
3419 if (skb->encapsulation)
3422 mac_len = skb->network_header - skb->mac_header;
3423 inner_net = skb->network_header;
3424 if (inner_mac_len > len_diff)
3426 inner_trans = skb->transport_header;
3429 ret = bpf_skb_net_hdr_push(skb, off, len_diff);
3430 if (unlikely(ret < 0))
3434 skb->inner_mac_header = inner_net - inner_mac_len;
3435 skb->inner_network_header = inner_net;
3436 skb->inner_transport_header = inner_trans;
3438 if (flags & BPF_F_ADJ_ROOM_ENCAP_L2_ETH)
3439 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
3441 skb_set_inner_protocol(skb, skb->protocol);
3443 skb->encapsulation = 1;
3444 skb_set_network_header(skb, mac_len);
3446 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP)
3447 gso_type |= SKB_GSO_UDP_TUNNEL;
3448 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE)
3449 gso_type |= SKB_GSO_GRE;
3450 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3451 gso_type |= SKB_GSO_IPXIP6;
3452 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4)
3453 gso_type |= SKB_GSO_IPXIP4;
3455 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE ||
3456 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) {
3457 int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ?
3458 sizeof(struct ipv6hdr) :
3459 sizeof(struct iphdr);
3461 skb_set_transport_header(skb, mac_len + nh_len);
3464 /* Match skb->protocol to new outer l3 protocol */
3465 if (skb->protocol == htons(ETH_P_IP) &&
3466 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3467 skb->protocol = htons(ETH_P_IPV6);
3468 else if (skb->protocol == htons(ETH_P_IPV6) &&
3469 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4)
3470 skb->protocol = htons(ETH_P_IP);
3473 if (skb_is_gso(skb)) {
3474 struct skb_shared_info *shinfo = skb_shinfo(skb);
3476 /* Due to header grow, MSS needs to be downgraded. */
3477 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3478 skb_decrease_gso_size(shinfo, len_diff);
3480 /* Header must be checked, and gso_segs recomputed. */
3481 shinfo->gso_type |= gso_type;
3482 shinfo->gso_segs = 0;
3488 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff,
3493 if (unlikely(flags & ~(BPF_F_ADJ_ROOM_FIXED_GSO |
3494 BPF_F_ADJ_ROOM_NO_CSUM_RESET)))
3497 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) {
3498 /* udp gso_size delineates datagrams, only allow if fixed */
3499 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) ||
3500 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3504 ret = skb_unclone(skb, GFP_ATOMIC);
3505 if (unlikely(ret < 0))
3508 ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
3509 if (unlikely(ret < 0))
3512 if (skb_is_gso(skb)) {
3513 struct skb_shared_info *shinfo = skb_shinfo(skb);
3515 /* Due to header shrink, MSS can be upgraded. */
3516 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3517 skb_increase_gso_size(shinfo, len_diff);
3519 /* Header must be checked, and gso_segs recomputed. */
3520 shinfo->gso_type |= SKB_GSO_DODGY;
3521 shinfo->gso_segs = 0;
3527 #define BPF_SKB_MAX_LEN SKB_MAX_ALLOC
3529 BPF_CALL_4(sk_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
3530 u32, mode, u64, flags)
3532 u32 len_diff_abs = abs(len_diff);
3533 bool shrink = len_diff < 0;
3536 if (unlikely(flags || mode))
3538 if (unlikely(len_diff_abs > 0xfffU))
3542 ret = skb_cow(skb, len_diff);
3543 if (unlikely(ret < 0))
3545 __skb_push(skb, len_diff_abs);
3546 memset(skb->data, 0, len_diff_abs);
3548 if (unlikely(!pskb_may_pull(skb, len_diff_abs)))
3550 __skb_pull(skb, len_diff_abs);
3552 if (tls_sw_has_ctx_rx(skb->sk)) {
3553 struct strp_msg *rxm = strp_msg(skb);
3555 rxm->full_len += len_diff;
3560 static const struct bpf_func_proto sk_skb_adjust_room_proto = {
3561 .func = sk_skb_adjust_room,
3563 .ret_type = RET_INTEGER,
3564 .arg1_type = ARG_PTR_TO_CTX,
3565 .arg2_type = ARG_ANYTHING,
3566 .arg3_type = ARG_ANYTHING,
3567 .arg4_type = ARG_ANYTHING,
3570 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
3571 u32, mode, u64, flags)
3573 u32 len_cur, len_diff_abs = abs(len_diff);
3574 u32 len_min = bpf_skb_net_base_len(skb);
3575 u32 len_max = BPF_SKB_MAX_LEN;
3576 __be16 proto = skb->protocol;
3577 bool shrink = len_diff < 0;
3581 if (unlikely(flags & ~(BPF_F_ADJ_ROOM_MASK |
3582 BPF_F_ADJ_ROOM_NO_CSUM_RESET)))
3584 if (unlikely(len_diff_abs > 0xfffU))
3586 if (unlikely(proto != htons(ETH_P_IP) &&
3587 proto != htons(ETH_P_IPV6)))
3590 off = skb_mac_header_len(skb);
3592 case BPF_ADJ_ROOM_NET:
3593 off += bpf_skb_net_base_len(skb);
3595 case BPF_ADJ_ROOM_MAC:
3601 len_cur = skb->len - skb_network_offset(skb);
3602 if ((shrink && (len_diff_abs >= len_cur ||
3603 len_cur - len_diff_abs < len_min)) ||
3604 (!shrink && (skb->len + len_diff_abs > len_max &&
3608 ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) :
3609 bpf_skb_net_grow(skb, off, len_diff_abs, flags);
3610 if (!ret && !(flags & BPF_F_ADJ_ROOM_NO_CSUM_RESET))
3611 __skb_reset_checksum_unnecessary(skb);
3613 bpf_compute_data_pointers(skb);
3617 static const struct bpf_func_proto bpf_skb_adjust_room_proto = {
3618 .func = bpf_skb_adjust_room,
3620 .ret_type = RET_INTEGER,
3621 .arg1_type = ARG_PTR_TO_CTX,
3622 .arg2_type = ARG_ANYTHING,
3623 .arg3_type = ARG_ANYTHING,
3624 .arg4_type = ARG_ANYTHING,
3627 static u32 __bpf_skb_min_len(const struct sk_buff *skb)
3629 u32 min_len = skb_network_offset(skb);
3631 if (skb_transport_header_was_set(skb))
3632 min_len = skb_transport_offset(skb);
3633 if (skb->ip_summed == CHECKSUM_PARTIAL)
3634 min_len = skb_checksum_start_offset(skb) +
3635 skb->csum_offset + sizeof(__sum16);
3639 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len)
3641 unsigned int old_len = skb->len;
3644 ret = __skb_grow_rcsum(skb, new_len);
3646 memset(skb->data + old_len, 0, new_len - old_len);
3650 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len)
3652 return __skb_trim_rcsum(skb, new_len);
3655 static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len,
3658 u32 max_len = BPF_SKB_MAX_LEN;
3659 u32 min_len = __bpf_skb_min_len(skb);
3662 if (unlikely(flags || new_len > max_len || new_len < min_len))
3664 if (skb->encapsulation)
3667 /* The basic idea of this helper is that it's performing the
3668 * needed work to either grow or trim an skb, and eBPF program
3669 * rewrites the rest via helpers like bpf_skb_store_bytes(),
3670 * bpf_lX_csum_replace() and others rather than passing a raw
3671 * buffer here. This one is a slow path helper and intended
3672 * for replies with control messages.
3674 * Like in bpf_skb_change_proto(), we want to keep this rather
3675 * minimal and without protocol specifics so that we are able
3676 * to separate concerns as in bpf_skb_store_bytes() should only
3677 * be the one responsible for writing buffers.
3679 * It's really expected to be a slow path operation here for
3680 * control message replies, so we're implicitly linearizing,
3681 * uncloning and drop offloads from the skb by this.
3683 ret = __bpf_try_make_writable(skb, skb->len);
3685 if (new_len > skb->len)
3686 ret = bpf_skb_grow_rcsum(skb, new_len);
3687 else if (new_len < skb->len)
3688 ret = bpf_skb_trim_rcsum(skb, new_len);
3689 if (!ret && skb_is_gso(skb))
3695 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len,
3698 int ret = __bpf_skb_change_tail(skb, new_len, flags);
3700 bpf_compute_data_pointers(skb);
3704 static const struct bpf_func_proto bpf_skb_change_tail_proto = {
3705 .func = bpf_skb_change_tail,
3707 .ret_type = RET_INTEGER,
3708 .arg1_type = ARG_PTR_TO_CTX,
3709 .arg2_type = ARG_ANYTHING,
3710 .arg3_type = ARG_ANYTHING,
3713 BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len,
3716 return __bpf_skb_change_tail(skb, new_len, flags);
3719 static const struct bpf_func_proto sk_skb_change_tail_proto = {
3720 .func = sk_skb_change_tail,
3722 .ret_type = RET_INTEGER,
3723 .arg1_type = ARG_PTR_TO_CTX,
3724 .arg2_type = ARG_ANYTHING,
3725 .arg3_type = ARG_ANYTHING,
3728 static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room,
3731 u32 max_len = BPF_SKB_MAX_LEN;
3732 u32 new_len = skb->len + head_room;
3735 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) ||
3736 new_len < skb->len))
3739 ret = skb_cow(skb, head_room);
3741 /* Idea for this helper is that we currently only
3742 * allow to expand on mac header. This means that
3743 * skb->protocol network header, etc, stay as is.
3744 * Compared to bpf_skb_change_tail(), we're more
3745 * flexible due to not needing to linearize or
3746 * reset GSO. Intention for this helper is to be
3747 * used by an L3 skb that needs to push mac header
3748 * for redirection into L2 device.
3750 __skb_push(skb, head_room);
3751 memset(skb->data, 0, head_room);
3752 skb_reset_mac_header(skb);
3753 skb_reset_mac_len(skb);
3759 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room,
3762 int ret = __bpf_skb_change_head(skb, head_room, flags);
3764 bpf_compute_data_pointers(skb);
3768 static const struct bpf_func_proto bpf_skb_change_head_proto = {
3769 .func = bpf_skb_change_head,
3771 .ret_type = RET_INTEGER,
3772 .arg1_type = ARG_PTR_TO_CTX,
3773 .arg2_type = ARG_ANYTHING,
3774 .arg3_type = ARG_ANYTHING,
3777 BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room,
3780 return __bpf_skb_change_head(skb, head_room, flags);
3783 static const struct bpf_func_proto sk_skb_change_head_proto = {
3784 .func = sk_skb_change_head,
3786 .ret_type = RET_INTEGER,
3787 .arg1_type = ARG_PTR_TO_CTX,
3788 .arg2_type = ARG_ANYTHING,
3789 .arg3_type = ARG_ANYTHING,
3792 BPF_CALL_1(bpf_xdp_get_buff_len, struct xdp_buff*, xdp)
3794 return xdp_get_buff_len(xdp);
3797 static const struct bpf_func_proto bpf_xdp_get_buff_len_proto = {
3798 .func = bpf_xdp_get_buff_len,
3800 .ret_type = RET_INTEGER,
3801 .arg1_type = ARG_PTR_TO_CTX,
3804 BTF_ID_LIST_SINGLE(bpf_xdp_get_buff_len_bpf_ids, struct, xdp_buff)
3806 const struct bpf_func_proto bpf_xdp_get_buff_len_trace_proto = {
3807 .func = bpf_xdp_get_buff_len,
3809 .arg1_type = ARG_PTR_TO_BTF_ID,
3810 .arg1_btf_id = &bpf_xdp_get_buff_len_bpf_ids[0],
3813 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp)
3815 return xdp_data_meta_unsupported(xdp) ? 0 :
3816 xdp->data - xdp->data_meta;
3819 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset)
3821 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame);
3822 unsigned long metalen = xdp_get_metalen(xdp);
3823 void *data_start = xdp_frame_end + metalen;
3824 void *data = xdp->data + offset;
3826 if (unlikely(data < data_start ||
3827 data > xdp->data_end - ETH_HLEN))
3831 memmove(xdp->data_meta + offset,
3832 xdp->data_meta, metalen);
3833 xdp->data_meta += offset;
3839 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = {
3840 .func = bpf_xdp_adjust_head,
3842 .ret_type = RET_INTEGER,
3843 .arg1_type = ARG_PTR_TO_CTX,
3844 .arg2_type = ARG_ANYTHING,
3847 static void bpf_xdp_copy_buf(struct xdp_buff *xdp, unsigned long off,
3848 void *buf, unsigned long len, bool flush)
3850 unsigned long ptr_len, ptr_off = 0;
3851 skb_frag_t *next_frag, *end_frag;
3852 struct skb_shared_info *sinfo;
3856 if (likely(xdp->data_end - xdp->data >= off + len)) {
3857 src = flush ? buf : xdp->data + off;
3858 dst = flush ? xdp->data + off : buf;
3859 memcpy(dst, src, len);
3863 sinfo = xdp_get_shared_info_from_buff(xdp);
3864 end_frag = &sinfo->frags[sinfo->nr_frags];
3865 next_frag = &sinfo->frags[0];
3867 ptr_len = xdp->data_end - xdp->data;
3868 ptr_buf = xdp->data;
3871 if (off < ptr_off + ptr_len) {
3872 unsigned long copy_off = off - ptr_off;
3873 unsigned long copy_len = min(len, ptr_len - copy_off);
3875 src = flush ? buf : ptr_buf + copy_off;
3876 dst = flush ? ptr_buf + copy_off : buf;
3877 memcpy(dst, src, copy_len);
3884 if (!len || next_frag == end_frag)
3888 ptr_buf = skb_frag_address(next_frag);
3889 ptr_len = skb_frag_size(next_frag);
3894 static void *bpf_xdp_pointer(struct xdp_buff *xdp, u32 offset, u32 len)
3896 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
3897 u32 size = xdp->data_end - xdp->data;
3898 void *addr = xdp->data;
3901 if (unlikely(offset > 0xffff || len > 0xffff))
3902 return ERR_PTR(-EFAULT);
3904 if (offset + len > xdp_get_buff_len(xdp))
3905 return ERR_PTR(-EINVAL);
3907 if (offset < size) /* linear area */
3911 for (i = 0; i < sinfo->nr_frags; i++) { /* paged area */
3912 u32 frag_size = skb_frag_size(&sinfo->frags[i]);
3914 if (offset < frag_size) {
3915 addr = skb_frag_address(&sinfo->frags[i]);
3919 offset -= frag_size;
3922 return offset + len <= size ? addr + offset : NULL;
3925 BPF_CALL_4(bpf_xdp_load_bytes, struct xdp_buff *, xdp, u32, offset,
3926 void *, buf, u32, len)
3930 ptr = bpf_xdp_pointer(xdp, offset, len);
3932 return PTR_ERR(ptr);
3935 bpf_xdp_copy_buf(xdp, offset, buf, len, false);
3937 memcpy(buf, ptr, len);
3942 static const struct bpf_func_proto bpf_xdp_load_bytes_proto = {
3943 .func = bpf_xdp_load_bytes,
3945 .ret_type = RET_INTEGER,
3946 .arg1_type = ARG_PTR_TO_CTX,
3947 .arg2_type = ARG_ANYTHING,
3948 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
3949 .arg4_type = ARG_CONST_SIZE,
3952 BPF_CALL_4(bpf_xdp_store_bytes, struct xdp_buff *, xdp, u32, offset,
3953 void *, buf, u32, len)
3957 ptr = bpf_xdp_pointer(xdp, offset, len);
3959 return PTR_ERR(ptr);
3962 bpf_xdp_copy_buf(xdp, offset, buf, len, true);
3964 memcpy(ptr, buf, len);
3969 static const struct bpf_func_proto bpf_xdp_store_bytes_proto = {
3970 .func = bpf_xdp_store_bytes,
3972 .ret_type = RET_INTEGER,
3973 .arg1_type = ARG_PTR_TO_CTX,
3974 .arg2_type = ARG_ANYTHING,
3975 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
3976 .arg4_type = ARG_CONST_SIZE,
3979 static int bpf_xdp_frags_increase_tail(struct xdp_buff *xdp, int offset)
3981 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
3982 skb_frag_t *frag = &sinfo->frags[sinfo->nr_frags - 1];
3983 struct xdp_rxq_info *rxq = xdp->rxq;
3984 unsigned int tailroom;
3986 if (!rxq->frag_size || rxq->frag_size > xdp->frame_sz)
3989 tailroom = rxq->frag_size - skb_frag_size(frag) - skb_frag_off(frag);
3990 if (unlikely(offset > tailroom))
3993 memset(skb_frag_address(frag) + skb_frag_size(frag), 0, offset);
3994 skb_frag_size_add(frag, offset);
3995 sinfo->xdp_frags_size += offset;
4000 static int bpf_xdp_frags_shrink_tail(struct xdp_buff *xdp, int offset)
4002 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
4003 int i, n_frags_free = 0, len_free = 0;
4005 if (unlikely(offset > (int)xdp_get_buff_len(xdp) - ETH_HLEN))
4008 for (i = sinfo->nr_frags - 1; i >= 0 && offset > 0; i--) {
4009 skb_frag_t *frag = &sinfo->frags[i];
4010 int shrink = min_t(int, offset, skb_frag_size(frag));
4015 if (skb_frag_size(frag) == shrink) {
4016 struct page *page = skb_frag_page(frag);
4018 __xdp_return(page_address(page), &xdp->rxq->mem,
4022 skb_frag_size_sub(frag, shrink);
4026 sinfo->nr_frags -= n_frags_free;
4027 sinfo->xdp_frags_size -= len_free;
4029 if (unlikely(!sinfo->nr_frags)) {
4030 xdp_buff_clear_frags_flag(xdp);
4031 xdp->data_end -= offset;
4037 BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset)
4039 void *data_hard_end = xdp_data_hard_end(xdp); /* use xdp->frame_sz */
4040 void *data_end = xdp->data_end + offset;
4042 if (unlikely(xdp_buff_has_frags(xdp))) { /* non-linear xdp buff */
4044 return bpf_xdp_frags_shrink_tail(xdp, -offset);
4046 return bpf_xdp_frags_increase_tail(xdp, offset);
4049 /* Notice that xdp_data_hard_end have reserved some tailroom */
4050 if (unlikely(data_end > data_hard_end))
4053 /* ALL drivers MUST init xdp->frame_sz, chicken check below */
4054 if (unlikely(xdp->frame_sz > PAGE_SIZE)) {
4055 WARN_ONCE(1, "Too BIG xdp->frame_sz = %d\n", xdp->frame_sz);
4059 if (unlikely(data_end < xdp->data + ETH_HLEN))
4062 /* Clear memory area on grow, can contain uninit kernel memory */
4064 memset(xdp->data_end, 0, offset);
4066 xdp->data_end = data_end;
4071 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = {
4072 .func = bpf_xdp_adjust_tail,
4074 .ret_type = RET_INTEGER,
4075 .arg1_type = ARG_PTR_TO_CTX,
4076 .arg2_type = ARG_ANYTHING,
4079 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset)
4081 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame);
4082 void *meta = xdp->data_meta + offset;
4083 unsigned long metalen = xdp->data - meta;
4085 if (xdp_data_meta_unsupported(xdp))
4087 if (unlikely(meta < xdp_frame_end ||
4090 if (unlikely(xdp_metalen_invalid(metalen)))
4093 xdp->data_meta = meta;
4098 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = {
4099 .func = bpf_xdp_adjust_meta,
4101 .ret_type = RET_INTEGER,
4102 .arg1_type = ARG_PTR_TO_CTX,
4103 .arg2_type = ARG_ANYTHING,
4106 /* XDP_REDIRECT works by a three-step process, implemented in the functions
4109 * 1. The bpf_redirect() and bpf_redirect_map() helpers will lookup the target
4110 * of the redirect and store it (along with some other metadata) in a per-CPU
4111 * struct bpf_redirect_info.
4113 * 2. When the program returns the XDP_REDIRECT return code, the driver will
4114 * call xdp_do_redirect() which will use the information in struct
4115 * bpf_redirect_info to actually enqueue the frame into a map type-specific
4116 * bulk queue structure.
4118 * 3. Before exiting its NAPI poll loop, the driver will call xdp_do_flush(),
4119 * which will flush all the different bulk queues, thus completing the
4122 * Pointers to the map entries will be kept around for this whole sequence of
4123 * steps, protected by RCU. However, there is no top-level rcu_read_lock() in
4124 * the core code; instead, the RCU protection relies on everything happening
4125 * inside a single NAPI poll sequence, which means it's between a pair of calls
4126 * to local_bh_disable()/local_bh_enable().
4128 * The map entries are marked as __rcu and the map code makes sure to
4129 * dereference those pointers with rcu_dereference_check() in a way that works
4130 * for both sections that to hold an rcu_read_lock() and sections that are
4131 * called from NAPI without a separate rcu_read_lock(). The code below does not
4132 * use RCU annotations, but relies on those in the map code.
4134 void xdp_do_flush(void)
4140 EXPORT_SYMBOL_GPL(xdp_do_flush);
4142 void bpf_clear_redirect_map(struct bpf_map *map)
4144 struct bpf_redirect_info *ri;
4147 for_each_possible_cpu(cpu) {
4148 ri = per_cpu_ptr(&bpf_redirect_info, cpu);
4149 /* Avoid polluting remote cacheline due to writes if
4150 * not needed. Once we pass this test, we need the
4151 * cmpxchg() to make sure it hasn't been changed in
4152 * the meantime by remote CPU.
4154 if (unlikely(READ_ONCE(ri->map) == map))
4155 cmpxchg(&ri->map, map, NULL);
4159 DEFINE_STATIC_KEY_FALSE(bpf_master_redirect_enabled_key);
4160 EXPORT_SYMBOL_GPL(bpf_master_redirect_enabled_key);
4162 u32 xdp_master_redirect(struct xdp_buff *xdp)
4164 struct net_device *master, *slave;
4165 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
4167 master = netdev_master_upper_dev_get_rcu(xdp->rxq->dev);
4168 slave = master->netdev_ops->ndo_xdp_get_xmit_slave(master, xdp);
4169 if (slave && slave != xdp->rxq->dev) {
4170 /* The target device is different from the receiving device, so
4171 * redirect it to the new device.
4172 * Using XDP_REDIRECT gets the correct behaviour from XDP enabled
4173 * drivers to unmap the packet from their rx ring.
4175 ri->tgt_index = slave->ifindex;
4176 ri->map_id = INT_MAX;
4177 ri->map_type = BPF_MAP_TYPE_UNSPEC;
4178 return XDP_REDIRECT;
4182 EXPORT_SYMBOL_GPL(xdp_master_redirect);
4184 static inline int __xdp_do_redirect_xsk(struct bpf_redirect_info *ri,
4185 struct net_device *dev,
4186 struct xdp_buff *xdp,
4187 struct bpf_prog *xdp_prog)
4189 enum bpf_map_type map_type = ri->map_type;
4190 void *fwd = ri->tgt_value;
4191 u32 map_id = ri->map_id;
4194 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */
4195 ri->map_type = BPF_MAP_TYPE_UNSPEC;
4197 err = __xsk_map_redirect(fwd, xdp);
4201 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index);
4204 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err);
4208 static __always_inline int __xdp_do_redirect_frame(struct bpf_redirect_info *ri,
4209 struct net_device *dev,
4210 struct xdp_frame *xdpf,
4211 struct bpf_prog *xdp_prog)
4213 enum bpf_map_type map_type = ri->map_type;
4214 void *fwd = ri->tgt_value;
4215 u32 map_id = ri->map_id;
4216 struct bpf_map *map;
4219 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */
4220 ri->map_type = BPF_MAP_TYPE_UNSPEC;
4222 if (unlikely(!xdpf)) {
4228 case BPF_MAP_TYPE_DEVMAP:
4230 case BPF_MAP_TYPE_DEVMAP_HASH:
4231 map = READ_ONCE(ri->map);
4232 if (unlikely(map)) {
4233 WRITE_ONCE(ri->map, NULL);
4234 err = dev_map_enqueue_multi(xdpf, dev, map,
4235 ri->flags & BPF_F_EXCLUDE_INGRESS);
4237 err = dev_map_enqueue(fwd, xdpf, dev);
4240 case BPF_MAP_TYPE_CPUMAP:
4241 err = cpu_map_enqueue(fwd, xdpf, dev);
4243 case BPF_MAP_TYPE_UNSPEC:
4244 if (map_id == INT_MAX) {
4245 fwd = dev_get_by_index_rcu(dev_net(dev), ri->tgt_index);
4246 if (unlikely(!fwd)) {
4250 err = dev_xdp_enqueue(fwd, xdpf, dev);
4261 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index);
4264 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err);
4268 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
4269 struct bpf_prog *xdp_prog)
4271 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
4272 enum bpf_map_type map_type = ri->map_type;
4274 /* XDP_REDIRECT is not fully supported yet for xdp frags since
4275 * not all XDP capable drivers can map non-linear xdp_frame in
4278 if (unlikely(xdp_buff_has_frags(xdp) &&
4279 map_type != BPF_MAP_TYPE_CPUMAP))
4282 if (map_type == BPF_MAP_TYPE_XSKMAP)
4283 return __xdp_do_redirect_xsk(ri, dev, xdp, xdp_prog);
4285 return __xdp_do_redirect_frame(ri, dev, xdp_convert_buff_to_frame(xdp),
4288 EXPORT_SYMBOL_GPL(xdp_do_redirect);
4290 int xdp_do_redirect_frame(struct net_device *dev, struct xdp_buff *xdp,
4291 struct xdp_frame *xdpf, struct bpf_prog *xdp_prog)
4293 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
4294 enum bpf_map_type map_type = ri->map_type;
4296 if (map_type == BPF_MAP_TYPE_XSKMAP)
4297 return __xdp_do_redirect_xsk(ri, dev, xdp, xdp_prog);
4299 return __xdp_do_redirect_frame(ri, dev, xdpf, xdp_prog);
4301 EXPORT_SYMBOL_GPL(xdp_do_redirect_frame);
4303 static int xdp_do_generic_redirect_map(struct net_device *dev,
4304 struct sk_buff *skb,
4305 struct xdp_buff *xdp,
4306 struct bpf_prog *xdp_prog,
4308 enum bpf_map_type map_type, u32 map_id)
4310 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
4311 struct bpf_map *map;
4315 case BPF_MAP_TYPE_DEVMAP:
4317 case BPF_MAP_TYPE_DEVMAP_HASH:
4318 map = READ_ONCE(ri->map);
4319 if (unlikely(map)) {
4320 WRITE_ONCE(ri->map, NULL);
4321 err = dev_map_redirect_multi(dev, skb, xdp_prog, map,
4322 ri->flags & BPF_F_EXCLUDE_INGRESS);
4324 err = dev_map_generic_redirect(fwd, skb, xdp_prog);
4329 case BPF_MAP_TYPE_XSKMAP:
4330 err = xsk_generic_rcv(fwd, xdp);
4335 case BPF_MAP_TYPE_CPUMAP:
4336 err = cpu_map_generic_redirect(fwd, skb);
4345 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index);
4348 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err);
4352 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
4353 struct xdp_buff *xdp, struct bpf_prog *xdp_prog)
4355 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
4356 enum bpf_map_type map_type = ri->map_type;
4357 void *fwd = ri->tgt_value;
4358 u32 map_id = ri->map_id;
4361 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */
4362 ri->map_type = BPF_MAP_TYPE_UNSPEC;
4364 if (map_type == BPF_MAP_TYPE_UNSPEC && map_id == INT_MAX) {
4365 fwd = dev_get_by_index_rcu(dev_net(dev), ri->tgt_index);
4366 if (unlikely(!fwd)) {
4371 err = xdp_ok_fwd_dev(fwd, skb->len);
4376 _trace_xdp_redirect(dev, xdp_prog, ri->tgt_index);
4377 generic_xdp_tx(skb, xdp_prog);
4381 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog, fwd, map_type, map_id);
4383 _trace_xdp_redirect_err(dev, xdp_prog, ri->tgt_index, err);
4387 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags)
4389 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
4391 if (unlikely(flags))
4394 /* NB! Map type UNSPEC and map_id == INT_MAX (never generated
4395 * by map_idr) is used for ifindex based XDP redirect.
4397 ri->tgt_index = ifindex;
4398 ri->map_id = INT_MAX;
4399 ri->map_type = BPF_MAP_TYPE_UNSPEC;
4401 return XDP_REDIRECT;
4404 static const struct bpf_func_proto bpf_xdp_redirect_proto = {
4405 .func = bpf_xdp_redirect,
4407 .ret_type = RET_INTEGER,
4408 .arg1_type = ARG_ANYTHING,
4409 .arg2_type = ARG_ANYTHING,
4412 BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex,
4415 return map->ops->map_redirect(map, ifindex, flags);
4418 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = {
4419 .func = bpf_xdp_redirect_map,
4421 .ret_type = RET_INTEGER,
4422 .arg1_type = ARG_CONST_MAP_PTR,
4423 .arg2_type = ARG_ANYTHING,
4424 .arg3_type = ARG_ANYTHING,
4427 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb,
4428 unsigned long off, unsigned long len)
4430 void *ptr = skb_header_pointer(skb, off, len, dst_buff);
4434 if (ptr != dst_buff)
4435 memcpy(dst_buff, ptr, len);
4440 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map,
4441 u64, flags, void *, meta, u64, meta_size)
4443 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
4445 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
4447 if (unlikely(!skb || skb_size > skb->len))
4450 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size,
4454 static const struct bpf_func_proto bpf_skb_event_output_proto = {
4455 .func = bpf_skb_event_output,
4457 .ret_type = RET_INTEGER,
4458 .arg1_type = ARG_PTR_TO_CTX,
4459 .arg2_type = ARG_CONST_MAP_PTR,
4460 .arg3_type = ARG_ANYTHING,
4461 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY,
4462 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
4465 BTF_ID_LIST_SINGLE(bpf_skb_output_btf_ids, struct, sk_buff)
4467 const struct bpf_func_proto bpf_skb_output_proto = {
4468 .func = bpf_skb_event_output,
4470 .ret_type = RET_INTEGER,
4471 .arg1_type = ARG_PTR_TO_BTF_ID,
4472 .arg1_btf_id = &bpf_skb_output_btf_ids[0],
4473 .arg2_type = ARG_CONST_MAP_PTR,
4474 .arg3_type = ARG_ANYTHING,
4475 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY,
4476 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
4479 static unsigned short bpf_tunnel_key_af(u64 flags)
4481 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET;
4484 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to,
4485 u32, size, u64, flags)
4487 const struct ip_tunnel_info *info = skb_tunnel_info(skb);
4488 u8 compat[sizeof(struct bpf_tunnel_key)];
4492 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6 |
4493 BPF_F_TUNINFO_FLAGS)))) {
4497 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) {
4501 if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
4504 case offsetof(struct bpf_tunnel_key, local_ipv6[0]):
4505 case offsetof(struct bpf_tunnel_key, tunnel_label):
4506 case offsetof(struct bpf_tunnel_key, tunnel_ext):
4508 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
4509 /* Fixup deprecated structure layouts here, so we have
4510 * a common path later on.
4512 if (ip_tunnel_info_af(info) != AF_INET)
4515 to = (struct bpf_tunnel_key *)compat;
4522 to->tunnel_id = be64_to_cpu(info->key.tun_id);
4523 to->tunnel_tos = info->key.tos;
4524 to->tunnel_ttl = info->key.ttl;
4525 if (flags & BPF_F_TUNINFO_FLAGS)
4526 to->tunnel_flags = info->key.tun_flags;
4530 if (flags & BPF_F_TUNINFO_IPV6) {
4531 memcpy(to->remote_ipv6, &info->key.u.ipv6.src,
4532 sizeof(to->remote_ipv6));
4533 memcpy(to->local_ipv6, &info->key.u.ipv6.dst,
4534 sizeof(to->local_ipv6));
4535 to->tunnel_label = be32_to_cpu(info->key.label);
4537 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src);
4538 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3);
4539 to->local_ipv4 = be32_to_cpu(info->key.u.ipv4.dst);
4540 memset(&to->local_ipv6[1], 0, sizeof(__u32) * 3);
4541 to->tunnel_label = 0;
4544 if (unlikely(size != sizeof(struct bpf_tunnel_key)))
4545 memcpy(to_orig, to, size);
4549 memset(to_orig, 0, size);
4553 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = {
4554 .func = bpf_skb_get_tunnel_key,
4556 .ret_type = RET_INTEGER,
4557 .arg1_type = ARG_PTR_TO_CTX,
4558 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
4559 .arg3_type = ARG_CONST_SIZE,
4560 .arg4_type = ARG_ANYTHING,
4563 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size)
4565 const struct ip_tunnel_info *info = skb_tunnel_info(skb);
4568 if (unlikely(!info ||
4569 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) {
4573 if (unlikely(size < info->options_len)) {
4578 ip_tunnel_info_opts_get(to, info);
4579 if (size > info->options_len)
4580 memset(to + info->options_len, 0, size - info->options_len);
4582 return info->options_len;
4584 memset(to, 0, size);
4588 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = {
4589 .func = bpf_skb_get_tunnel_opt,
4591 .ret_type = RET_INTEGER,
4592 .arg1_type = ARG_PTR_TO_CTX,
4593 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
4594 .arg3_type = ARG_CONST_SIZE,
4597 static struct metadata_dst __percpu *md_dst;
4599 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
4600 const struct bpf_tunnel_key *, from, u32, size, u64, flags)
4602 struct metadata_dst *md = this_cpu_ptr(md_dst);
4603 u8 compat[sizeof(struct bpf_tunnel_key)];
4604 struct ip_tunnel_info *info;
4606 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX |
4607 BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER)))
4609 if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
4611 case offsetof(struct bpf_tunnel_key, local_ipv6[0]):
4612 case offsetof(struct bpf_tunnel_key, tunnel_label):
4613 case offsetof(struct bpf_tunnel_key, tunnel_ext):
4614 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
4615 /* Fixup deprecated structure layouts here, so we have
4616 * a common path later on.
4618 memcpy(compat, from, size);
4619 memset(compat + size, 0, sizeof(compat) - size);
4620 from = (const struct bpf_tunnel_key *) compat;
4626 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) ||
4631 dst_hold((struct dst_entry *) md);
4632 skb_dst_set(skb, (struct dst_entry *) md);
4634 info = &md->u.tun_info;
4635 memset(info, 0, sizeof(*info));
4636 info->mode = IP_TUNNEL_INFO_TX;
4638 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
4639 if (flags & BPF_F_DONT_FRAGMENT)
4640 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT;
4641 if (flags & BPF_F_ZERO_CSUM_TX)
4642 info->key.tun_flags &= ~TUNNEL_CSUM;
4643 if (flags & BPF_F_SEQ_NUMBER)
4644 info->key.tun_flags |= TUNNEL_SEQ;
4646 info->key.tun_id = cpu_to_be64(from->tunnel_id);
4647 info->key.tos = from->tunnel_tos;
4648 info->key.ttl = from->tunnel_ttl;
4650 if (flags & BPF_F_TUNINFO_IPV6) {
4651 info->mode |= IP_TUNNEL_INFO_IPV6;
4652 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6,
4653 sizeof(from->remote_ipv6));
4654 memcpy(&info->key.u.ipv6.src, from->local_ipv6,
4655 sizeof(from->local_ipv6));
4656 info->key.label = cpu_to_be32(from->tunnel_label) &
4657 IPV6_FLOWLABEL_MASK;
4659 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4);
4660 info->key.u.ipv4.src = cpu_to_be32(from->local_ipv4);
4661 info->key.flow_flags = FLOWI_FLAG_ANYSRC;
4667 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = {
4668 .func = bpf_skb_set_tunnel_key,
4670 .ret_type = RET_INTEGER,
4671 .arg1_type = ARG_PTR_TO_CTX,
4672 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
4673 .arg3_type = ARG_CONST_SIZE,
4674 .arg4_type = ARG_ANYTHING,
4677 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb,
4678 const u8 *, from, u32, size)
4680 struct ip_tunnel_info *info = skb_tunnel_info(skb);
4681 const struct metadata_dst *md = this_cpu_ptr(md_dst);
4683 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1))))
4685 if (unlikely(size > IP_TUNNEL_OPTS_MAX))
4688 ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT);
4693 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = {
4694 .func = bpf_skb_set_tunnel_opt,
4696 .ret_type = RET_INTEGER,
4697 .arg1_type = ARG_PTR_TO_CTX,
4698 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
4699 .arg3_type = ARG_CONST_SIZE,
4702 static const struct bpf_func_proto *
4703 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which)
4706 struct metadata_dst __percpu *tmp;
4708 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX,
4713 if (cmpxchg(&md_dst, NULL, tmp))
4714 metadata_dst_free_percpu(tmp);
4718 case BPF_FUNC_skb_set_tunnel_key:
4719 return &bpf_skb_set_tunnel_key_proto;
4720 case BPF_FUNC_skb_set_tunnel_opt:
4721 return &bpf_skb_set_tunnel_opt_proto;
4727 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map,
4730 struct bpf_array *array = container_of(map, struct bpf_array, map);
4731 struct cgroup *cgrp;
4734 sk = skb_to_full_sk(skb);
4735 if (!sk || !sk_fullsock(sk))
4737 if (unlikely(idx >= array->map.max_entries))
4740 cgrp = READ_ONCE(array->ptrs[idx]);
4741 if (unlikely(!cgrp))
4744 return sk_under_cgroup_hierarchy(sk, cgrp);
4747 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = {
4748 .func = bpf_skb_under_cgroup,
4750 .ret_type = RET_INTEGER,
4751 .arg1_type = ARG_PTR_TO_CTX,
4752 .arg2_type = ARG_CONST_MAP_PTR,
4753 .arg3_type = ARG_ANYTHING,
4756 #ifdef CONFIG_SOCK_CGROUP_DATA
4757 static inline u64 __bpf_sk_cgroup_id(struct sock *sk)
4759 struct cgroup *cgrp;
4761 sk = sk_to_full_sk(sk);
4762 if (!sk || !sk_fullsock(sk))
4765 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
4766 return cgroup_id(cgrp);
4769 BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb)
4771 return __bpf_sk_cgroup_id(skb->sk);
4774 static const struct bpf_func_proto bpf_skb_cgroup_id_proto = {
4775 .func = bpf_skb_cgroup_id,
4777 .ret_type = RET_INTEGER,
4778 .arg1_type = ARG_PTR_TO_CTX,
4781 static inline u64 __bpf_sk_ancestor_cgroup_id(struct sock *sk,
4784 struct cgroup *ancestor;
4785 struct cgroup *cgrp;
4787 sk = sk_to_full_sk(sk);
4788 if (!sk || !sk_fullsock(sk))
4791 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
4792 ancestor = cgroup_ancestor(cgrp, ancestor_level);
4796 return cgroup_id(ancestor);
4799 BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int,
4802 return __bpf_sk_ancestor_cgroup_id(skb->sk, ancestor_level);
4805 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = {
4806 .func = bpf_skb_ancestor_cgroup_id,
4808 .ret_type = RET_INTEGER,
4809 .arg1_type = ARG_PTR_TO_CTX,
4810 .arg2_type = ARG_ANYTHING,
4813 BPF_CALL_1(bpf_sk_cgroup_id, struct sock *, sk)
4815 return __bpf_sk_cgroup_id(sk);
4818 static const struct bpf_func_proto bpf_sk_cgroup_id_proto = {
4819 .func = bpf_sk_cgroup_id,
4821 .ret_type = RET_INTEGER,
4822 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
4825 BPF_CALL_2(bpf_sk_ancestor_cgroup_id, struct sock *, sk, int, ancestor_level)
4827 return __bpf_sk_ancestor_cgroup_id(sk, ancestor_level);
4830 static const struct bpf_func_proto bpf_sk_ancestor_cgroup_id_proto = {
4831 .func = bpf_sk_ancestor_cgroup_id,
4833 .ret_type = RET_INTEGER,
4834 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
4835 .arg2_type = ARG_ANYTHING,
4839 static unsigned long bpf_xdp_copy(void *dst, const void *ctx,
4840 unsigned long off, unsigned long len)
4842 struct xdp_buff *xdp = (struct xdp_buff *)ctx;
4844 bpf_xdp_copy_buf(xdp, off, dst, len, false);
4848 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map,
4849 u64, flags, void *, meta, u64, meta_size)
4851 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
4853 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
4856 if (unlikely(!xdp || xdp_size > xdp_get_buff_len(xdp)))
4859 return bpf_event_output(map, flags, meta, meta_size, xdp,
4860 xdp_size, bpf_xdp_copy);
4863 static const struct bpf_func_proto bpf_xdp_event_output_proto = {
4864 .func = bpf_xdp_event_output,
4866 .ret_type = RET_INTEGER,
4867 .arg1_type = ARG_PTR_TO_CTX,
4868 .arg2_type = ARG_CONST_MAP_PTR,
4869 .arg3_type = ARG_ANYTHING,
4870 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY,
4871 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
4874 BTF_ID_LIST_SINGLE(bpf_xdp_output_btf_ids, struct, xdp_buff)
4876 const struct bpf_func_proto bpf_xdp_output_proto = {
4877 .func = bpf_xdp_event_output,
4879 .ret_type = RET_INTEGER,
4880 .arg1_type = ARG_PTR_TO_BTF_ID,
4881 .arg1_btf_id = &bpf_xdp_output_btf_ids[0],
4882 .arg2_type = ARG_CONST_MAP_PTR,
4883 .arg3_type = ARG_ANYTHING,
4884 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY,
4885 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
4888 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb)
4890 return skb->sk ? __sock_gen_cookie(skb->sk) : 0;
4893 static const struct bpf_func_proto bpf_get_socket_cookie_proto = {
4894 .func = bpf_get_socket_cookie,
4896 .ret_type = RET_INTEGER,
4897 .arg1_type = ARG_PTR_TO_CTX,
4900 BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx)
4902 return __sock_gen_cookie(ctx->sk);
4905 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = {
4906 .func = bpf_get_socket_cookie_sock_addr,
4908 .ret_type = RET_INTEGER,
4909 .arg1_type = ARG_PTR_TO_CTX,
4912 BPF_CALL_1(bpf_get_socket_cookie_sock, struct sock *, ctx)
4914 return __sock_gen_cookie(ctx);
4917 static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto = {
4918 .func = bpf_get_socket_cookie_sock,
4920 .ret_type = RET_INTEGER,
4921 .arg1_type = ARG_PTR_TO_CTX,
4924 BPF_CALL_1(bpf_get_socket_ptr_cookie, struct sock *, sk)
4926 return sk ? sock_gen_cookie(sk) : 0;
4929 const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto = {
4930 .func = bpf_get_socket_ptr_cookie,
4932 .ret_type = RET_INTEGER,
4933 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
4936 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx)
4938 return __sock_gen_cookie(ctx->sk);
4941 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = {
4942 .func = bpf_get_socket_cookie_sock_ops,
4944 .ret_type = RET_INTEGER,
4945 .arg1_type = ARG_PTR_TO_CTX,
4948 static u64 __bpf_get_netns_cookie(struct sock *sk)
4950 const struct net *net = sk ? sock_net(sk) : &init_net;
4952 return net->net_cookie;
4955 BPF_CALL_1(bpf_get_netns_cookie_sock, struct sock *, ctx)
4957 return __bpf_get_netns_cookie(ctx);
4960 static const struct bpf_func_proto bpf_get_netns_cookie_sock_proto = {
4961 .func = bpf_get_netns_cookie_sock,
4963 .ret_type = RET_INTEGER,
4964 .arg1_type = ARG_PTR_TO_CTX_OR_NULL,
4967 BPF_CALL_1(bpf_get_netns_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx)
4969 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL);
4972 static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto = {
4973 .func = bpf_get_netns_cookie_sock_addr,
4975 .ret_type = RET_INTEGER,
4976 .arg1_type = ARG_PTR_TO_CTX_OR_NULL,
4979 BPF_CALL_1(bpf_get_netns_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx)
4981 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL);
4984 static const struct bpf_func_proto bpf_get_netns_cookie_sock_ops_proto = {
4985 .func = bpf_get_netns_cookie_sock_ops,
4987 .ret_type = RET_INTEGER,
4988 .arg1_type = ARG_PTR_TO_CTX_OR_NULL,
4991 BPF_CALL_1(bpf_get_netns_cookie_sk_msg, struct sk_msg *, ctx)
4993 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL);
4996 static const struct bpf_func_proto bpf_get_netns_cookie_sk_msg_proto = {
4997 .func = bpf_get_netns_cookie_sk_msg,
4999 .ret_type = RET_INTEGER,
5000 .arg1_type = ARG_PTR_TO_CTX_OR_NULL,
5003 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb)
5005 struct sock *sk = sk_to_full_sk(skb->sk);
5008 if (!sk || !sk_fullsock(sk))
5010 kuid = sock_net_uid(sock_net(sk), sk);
5011 return from_kuid_munged(sock_net(sk)->user_ns, kuid);
5014 static const struct bpf_func_proto bpf_get_socket_uid_proto = {
5015 .func = bpf_get_socket_uid,
5017 .ret_type = RET_INTEGER,
5018 .arg1_type = ARG_PTR_TO_CTX,
5021 static int sol_socket_sockopt(struct sock *sk, int optname,
5022 char *optval, int *optlen,
5034 case SO_MAX_PACING_RATE:
5035 case SO_BINDTOIFINDEX:
5037 if (*optlen != sizeof(int))
5040 case SO_BINDTODEVICE:
5047 if (optname == SO_BINDTODEVICE)
5049 return sk_getsockopt(sk, SOL_SOCKET, optname,
5050 KERNEL_SOCKPTR(optval),
5051 KERNEL_SOCKPTR(optlen));
5054 return sk_setsockopt(sk, SOL_SOCKET, optname,
5055 KERNEL_SOCKPTR(optval), *optlen);
5058 static int bpf_sol_tcp_setsockopt(struct sock *sk, int optname,
5059 char *optval, int optlen)
5061 struct tcp_sock *tp = tcp_sk(sk);
5062 unsigned long timeout;
5065 if (optlen != sizeof(int))
5068 val = *(int *)optval;
5070 /* Only some options are supported */
5073 if (val <= 0 || tp->data_segs_out > tp->syn_data)
5075 tcp_snd_cwnd_set(tp, val);
5077 case TCP_BPF_SNDCWND_CLAMP:
5080 tp->snd_cwnd_clamp = val;
5081 tp->snd_ssthresh = val;
5083 case TCP_BPF_DELACK_MAX:
5084 timeout = usecs_to_jiffies(val);
5085 if (timeout > TCP_DELACK_MAX ||
5086 timeout < TCP_TIMEOUT_MIN)
5088 inet_csk(sk)->icsk_delack_max = timeout;
5090 case TCP_BPF_RTO_MIN:
5091 timeout = usecs_to_jiffies(val);
5092 if (timeout > TCP_RTO_MIN ||
5093 timeout < TCP_TIMEOUT_MIN)
5095 inet_csk(sk)->icsk_rto_min = timeout;
5104 static int sol_tcp_sockopt(struct sock *sk, int optname,
5105 char *optval, int *optlen,
5108 if (sk->sk_prot->setsockopt != tcp_setsockopt)
5118 case TCP_WINDOW_CLAMP:
5119 case TCP_THIN_LINEAR_TIMEOUTS:
5120 case TCP_USER_TIMEOUT:
5121 case TCP_NOTSENT_LOWAT:
5123 if (*optlen != sizeof(int))
5126 case TCP_CONGESTION:
5137 return bpf_sol_tcp_setsockopt(sk, optname, optval, *optlen);
5141 if (optname == TCP_SAVED_SYN) {
5142 struct tcp_sock *tp = tcp_sk(sk);
5144 if (!tp->saved_syn ||
5145 *optlen > tcp_saved_syn_len(tp->saved_syn))
5147 memcpy(optval, tp->saved_syn->data, *optlen);
5148 /* It cannot free tp->saved_syn here because it
5149 * does not know if the user space still needs it.
5154 if (optname == TCP_CONGESTION) {
5155 if (!inet_csk(sk)->icsk_ca_ops)
5157 /* BPF expects NULL-terminated tcp-cc string */
5158 optval[--(*optlen)] = '\0';
5161 return do_tcp_getsockopt(sk, SOL_TCP, optname,
5162 KERNEL_SOCKPTR(optval),
5163 KERNEL_SOCKPTR(optlen));
5166 return do_tcp_setsockopt(sk, SOL_TCP, optname,
5167 KERNEL_SOCKPTR(optval), *optlen);
5170 static int sol_ip_sockopt(struct sock *sk, int optname,
5171 char *optval, int *optlen,
5174 if (sk->sk_family != AF_INET)
5179 if (*optlen != sizeof(int))
5187 return do_ip_getsockopt(sk, SOL_IP, optname,
5188 KERNEL_SOCKPTR(optval),
5189 KERNEL_SOCKPTR(optlen));
5191 return do_ip_setsockopt(sk, SOL_IP, optname,
5192 KERNEL_SOCKPTR(optval), *optlen);
5195 static int sol_ipv6_sockopt(struct sock *sk, int optname,
5196 char *optval, int *optlen,
5199 if (sk->sk_family != AF_INET6)
5204 case IPV6_AUTOFLOWLABEL:
5205 if (*optlen != sizeof(int))
5213 return ipv6_bpf_stub->ipv6_getsockopt(sk, SOL_IPV6, optname,
5214 KERNEL_SOCKPTR(optval),
5215 KERNEL_SOCKPTR(optlen));
5217 return ipv6_bpf_stub->ipv6_setsockopt(sk, SOL_IPV6, optname,
5218 KERNEL_SOCKPTR(optval), *optlen);
5221 static int __bpf_setsockopt(struct sock *sk, int level, int optname,
5222 char *optval, int optlen)
5224 if (!sk_fullsock(sk))
5227 if (level == SOL_SOCKET)
5228 return sol_socket_sockopt(sk, optname, optval, &optlen, false);
5229 else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP)
5230 return sol_ip_sockopt(sk, optname, optval, &optlen, false);
5231 else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6)
5232 return sol_ipv6_sockopt(sk, optname, optval, &optlen, false);
5233 else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP)
5234 return sol_tcp_sockopt(sk, optname, optval, &optlen, false);
5239 static int _bpf_setsockopt(struct sock *sk, int level, int optname,
5240 char *optval, int optlen)
5242 if (sk_fullsock(sk))
5243 sock_owned_by_me(sk);
5244 return __bpf_setsockopt(sk, level, optname, optval, optlen);
5247 static int __bpf_getsockopt(struct sock *sk, int level, int optname,
5248 char *optval, int optlen)
5250 int err, saved_optlen = optlen;
5252 if (!sk_fullsock(sk)) {
5257 if (level == SOL_SOCKET)
5258 err = sol_socket_sockopt(sk, optname, optval, &optlen, true);
5259 else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP)
5260 err = sol_tcp_sockopt(sk, optname, optval, &optlen, true);
5261 else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP)
5262 err = sol_ip_sockopt(sk, optname, optval, &optlen, true);
5263 else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6)
5264 err = sol_ipv6_sockopt(sk, optname, optval, &optlen, true);
5271 if (optlen < saved_optlen)
5272 memset(optval + optlen, 0, saved_optlen - optlen);
5276 static int _bpf_getsockopt(struct sock *sk, int level, int optname,
5277 char *optval, int optlen)
5279 if (sk_fullsock(sk))
5280 sock_owned_by_me(sk);
5281 return __bpf_getsockopt(sk, level, optname, optval, optlen);
5284 BPF_CALL_5(bpf_sk_setsockopt, struct sock *, sk, int, level,
5285 int, optname, char *, optval, int, optlen)
5287 if (level == SOL_TCP && optname == TCP_CONGESTION) {
5288 if (optlen >= sizeof("cdg") - 1 &&
5289 !strncmp("cdg", optval, optlen))
5293 return _bpf_setsockopt(sk, level, optname, optval, optlen);
5296 const struct bpf_func_proto bpf_sk_setsockopt_proto = {
5297 .func = bpf_sk_setsockopt,
5299 .ret_type = RET_INTEGER,
5300 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
5301 .arg2_type = ARG_ANYTHING,
5302 .arg3_type = ARG_ANYTHING,
5303 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY,
5304 .arg5_type = ARG_CONST_SIZE,
5307 BPF_CALL_5(bpf_sk_getsockopt, struct sock *, sk, int, level,
5308 int, optname, char *, optval, int, optlen)
5310 return _bpf_getsockopt(sk, level, optname, optval, optlen);
5313 const struct bpf_func_proto bpf_sk_getsockopt_proto = {
5314 .func = bpf_sk_getsockopt,
5316 .ret_type = RET_INTEGER,
5317 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
5318 .arg2_type = ARG_ANYTHING,
5319 .arg3_type = ARG_ANYTHING,
5320 .arg4_type = ARG_PTR_TO_UNINIT_MEM,
5321 .arg5_type = ARG_CONST_SIZE,
5324 BPF_CALL_5(bpf_unlocked_sk_setsockopt, struct sock *, sk, int, level,
5325 int, optname, char *, optval, int, optlen)
5327 return __bpf_setsockopt(sk, level, optname, optval, optlen);
5330 const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto = {
5331 .func = bpf_unlocked_sk_setsockopt,
5333 .ret_type = RET_INTEGER,
5334 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
5335 .arg2_type = ARG_ANYTHING,
5336 .arg3_type = ARG_ANYTHING,
5337 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY,
5338 .arg5_type = ARG_CONST_SIZE,
5341 BPF_CALL_5(bpf_unlocked_sk_getsockopt, struct sock *, sk, int, level,
5342 int, optname, char *, optval, int, optlen)
5344 return __bpf_getsockopt(sk, level, optname, optval, optlen);
5347 const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto = {
5348 .func = bpf_unlocked_sk_getsockopt,
5350 .ret_type = RET_INTEGER,
5351 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
5352 .arg2_type = ARG_ANYTHING,
5353 .arg3_type = ARG_ANYTHING,
5354 .arg4_type = ARG_PTR_TO_UNINIT_MEM,
5355 .arg5_type = ARG_CONST_SIZE,
5358 BPF_CALL_5(bpf_sock_addr_setsockopt, struct bpf_sock_addr_kern *, ctx,
5359 int, level, int, optname, char *, optval, int, optlen)
5361 return _bpf_setsockopt(ctx->sk, level, optname, optval, optlen);
5364 static const struct bpf_func_proto bpf_sock_addr_setsockopt_proto = {
5365 .func = bpf_sock_addr_setsockopt,
5367 .ret_type = RET_INTEGER,
5368 .arg1_type = ARG_PTR_TO_CTX,
5369 .arg2_type = ARG_ANYTHING,
5370 .arg3_type = ARG_ANYTHING,
5371 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY,
5372 .arg5_type = ARG_CONST_SIZE,
5375 BPF_CALL_5(bpf_sock_addr_getsockopt, struct bpf_sock_addr_kern *, ctx,
5376 int, level, int, optname, char *, optval, int, optlen)
5378 return _bpf_getsockopt(ctx->sk, level, optname, optval, optlen);
5381 static const struct bpf_func_proto bpf_sock_addr_getsockopt_proto = {
5382 .func = bpf_sock_addr_getsockopt,
5384 .ret_type = RET_INTEGER,
5385 .arg1_type = ARG_PTR_TO_CTX,
5386 .arg2_type = ARG_ANYTHING,
5387 .arg3_type = ARG_ANYTHING,
5388 .arg4_type = ARG_PTR_TO_UNINIT_MEM,
5389 .arg5_type = ARG_CONST_SIZE,
5392 BPF_CALL_5(bpf_sock_ops_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
5393 int, level, int, optname, char *, optval, int, optlen)
5395 return _bpf_setsockopt(bpf_sock->sk, level, optname, optval, optlen);
5398 static const struct bpf_func_proto bpf_sock_ops_setsockopt_proto = {
5399 .func = bpf_sock_ops_setsockopt,
5401 .ret_type = RET_INTEGER,
5402 .arg1_type = ARG_PTR_TO_CTX,
5403 .arg2_type = ARG_ANYTHING,
5404 .arg3_type = ARG_ANYTHING,
5405 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY,
5406 .arg5_type = ARG_CONST_SIZE,
5409 static int bpf_sock_ops_get_syn(struct bpf_sock_ops_kern *bpf_sock,
5410 int optname, const u8 **start)
5412 struct sk_buff *syn_skb = bpf_sock->syn_skb;
5413 const u8 *hdr_start;
5417 /* sk is a request_sock here */
5419 if (optname == TCP_BPF_SYN) {
5420 hdr_start = syn_skb->data;
5421 ret = tcp_hdrlen(syn_skb);
5422 } else if (optname == TCP_BPF_SYN_IP) {
5423 hdr_start = skb_network_header(syn_skb);
5424 ret = skb_network_header_len(syn_skb) +
5425 tcp_hdrlen(syn_skb);
5427 /* optname == TCP_BPF_SYN_MAC */
5428 hdr_start = skb_mac_header(syn_skb);
5429 ret = skb_mac_header_len(syn_skb) +
5430 skb_network_header_len(syn_skb) +
5431 tcp_hdrlen(syn_skb);
5434 struct sock *sk = bpf_sock->sk;
5435 struct saved_syn *saved_syn;
5437 if (sk->sk_state == TCP_NEW_SYN_RECV)
5438 /* synack retransmit. bpf_sock->syn_skb will
5439 * not be available. It has to resort to
5440 * saved_syn (if it is saved).
5442 saved_syn = inet_reqsk(sk)->saved_syn;
5444 saved_syn = tcp_sk(sk)->saved_syn;
5449 if (optname == TCP_BPF_SYN) {
5450 hdr_start = saved_syn->data +
5451 saved_syn->mac_hdrlen +
5452 saved_syn->network_hdrlen;
5453 ret = saved_syn->tcp_hdrlen;
5454 } else if (optname == TCP_BPF_SYN_IP) {
5455 hdr_start = saved_syn->data +
5456 saved_syn->mac_hdrlen;
5457 ret = saved_syn->network_hdrlen +
5458 saved_syn->tcp_hdrlen;
5460 /* optname == TCP_BPF_SYN_MAC */
5462 /* TCP_SAVE_SYN may not have saved the mac hdr */
5463 if (!saved_syn->mac_hdrlen)
5466 hdr_start = saved_syn->data;
5467 ret = saved_syn->mac_hdrlen +
5468 saved_syn->network_hdrlen +
5469 saved_syn->tcp_hdrlen;
5477 BPF_CALL_5(bpf_sock_ops_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
5478 int, level, int, optname, char *, optval, int, optlen)
5480 if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP &&
5481 optname >= TCP_BPF_SYN && optname <= TCP_BPF_SYN_MAC) {
5482 int ret, copy_len = 0;
5485 ret = bpf_sock_ops_get_syn(bpf_sock, optname, &start);
5488 if (optlen < copy_len) {
5493 memcpy(optval, start, copy_len);
5496 /* Zero out unused buffer at the end */
5497 memset(optval + copy_len, 0, optlen - copy_len);
5502 return _bpf_getsockopt(bpf_sock->sk, level, optname, optval, optlen);
5505 static const struct bpf_func_proto bpf_sock_ops_getsockopt_proto = {
5506 .func = bpf_sock_ops_getsockopt,
5508 .ret_type = RET_INTEGER,
5509 .arg1_type = ARG_PTR_TO_CTX,
5510 .arg2_type = ARG_ANYTHING,
5511 .arg3_type = ARG_ANYTHING,
5512 .arg4_type = ARG_PTR_TO_UNINIT_MEM,
5513 .arg5_type = ARG_CONST_SIZE,
5516 BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock,
5519 struct sock *sk = bpf_sock->sk;
5520 int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS;
5522 if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk))
5525 tcp_sk(sk)->bpf_sock_ops_cb_flags = val;
5527 return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS);
5530 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = {
5531 .func = bpf_sock_ops_cb_flags_set,
5533 .ret_type = RET_INTEGER,
5534 .arg1_type = ARG_PTR_TO_CTX,
5535 .arg2_type = ARG_ANYTHING,
5538 const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
5539 EXPORT_SYMBOL_GPL(ipv6_bpf_stub);
5541 BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr,
5545 struct sock *sk = ctx->sk;
5546 u32 flags = BIND_FROM_BPF;
5550 if (addr_len < offsetofend(struct sockaddr, sa_family))
5552 if (addr->sa_family == AF_INET) {
5553 if (addr_len < sizeof(struct sockaddr_in))
5555 if (((struct sockaddr_in *)addr)->sin_port == htons(0))
5556 flags |= BIND_FORCE_ADDRESS_NO_PORT;
5557 return __inet_bind(sk, addr, addr_len, flags);
5558 #if IS_ENABLED(CONFIG_IPV6)
5559 } else if (addr->sa_family == AF_INET6) {
5560 if (addr_len < SIN6_LEN_RFC2133)
5562 if (((struct sockaddr_in6 *)addr)->sin6_port == htons(0))
5563 flags |= BIND_FORCE_ADDRESS_NO_PORT;
5564 /* ipv6_bpf_stub cannot be NULL, since it's called from
5565 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded
5567 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, flags);
5568 #endif /* CONFIG_IPV6 */
5570 #endif /* CONFIG_INET */
5572 return -EAFNOSUPPORT;
5575 static const struct bpf_func_proto bpf_bind_proto = {
5578 .ret_type = RET_INTEGER,
5579 .arg1_type = ARG_PTR_TO_CTX,
5580 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
5581 .arg3_type = ARG_CONST_SIZE,
5585 BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index,
5586 struct bpf_xfrm_state *, to, u32, size, u64, flags)
5588 const struct sec_path *sp = skb_sec_path(skb);
5589 const struct xfrm_state *x;
5591 if (!sp || unlikely(index >= sp->len || flags))
5594 x = sp->xvec[index];
5596 if (unlikely(size != sizeof(struct bpf_xfrm_state)))
5599 to->reqid = x->props.reqid;
5600 to->spi = x->id.spi;
5601 to->family = x->props.family;
5604 if (to->family == AF_INET6) {
5605 memcpy(to->remote_ipv6, x->props.saddr.a6,
5606 sizeof(to->remote_ipv6));
5608 to->remote_ipv4 = x->props.saddr.a4;
5609 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3);
5614 memset(to, 0, size);
5618 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = {
5619 .func = bpf_skb_get_xfrm_state,
5621 .ret_type = RET_INTEGER,
5622 .arg1_type = ARG_PTR_TO_CTX,
5623 .arg2_type = ARG_ANYTHING,
5624 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
5625 .arg4_type = ARG_CONST_SIZE,
5626 .arg5_type = ARG_ANYTHING,
5630 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6)
5631 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params,
5632 const struct neighbour *neigh,
5633 const struct net_device *dev, u32 mtu)
5635 memcpy(params->dmac, neigh->ha, ETH_ALEN);
5636 memcpy(params->smac, dev->dev_addr, ETH_ALEN);
5637 params->h_vlan_TCI = 0;
5638 params->h_vlan_proto = 0;
5640 params->mtu_result = mtu; /* union with tot_len */
5646 #if IS_ENABLED(CONFIG_INET)
5647 static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
5648 u32 flags, bool check_mtu)
5650 struct fib_nh_common *nhc;
5651 struct in_device *in_dev;
5652 struct neighbour *neigh;
5653 struct net_device *dev;
5654 struct fib_result res;
5659 dev = dev_get_by_index_rcu(net, params->ifindex);
5663 /* verify forwarding is enabled on this interface */
5664 in_dev = __in_dev_get_rcu(dev);
5665 if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev)))
5666 return BPF_FIB_LKUP_RET_FWD_DISABLED;
5668 if (flags & BPF_FIB_LOOKUP_OUTPUT) {
5670 fl4.flowi4_oif = params->ifindex;
5672 fl4.flowi4_iif = params->ifindex;
5675 fl4.flowi4_tos = params->tos & IPTOS_RT_MASK;
5676 fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
5677 fl4.flowi4_flags = 0;
5679 fl4.flowi4_proto = params->l4_protocol;
5680 fl4.daddr = params->ipv4_dst;
5681 fl4.saddr = params->ipv4_src;
5682 fl4.fl4_sport = params->sport;
5683 fl4.fl4_dport = params->dport;
5684 fl4.flowi4_multipath_hash = 0;
5686 if (flags & BPF_FIB_LOOKUP_DIRECT) {
5687 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
5688 struct fib_table *tb;
5690 tb = fib_get_table(net, tbid);
5692 return BPF_FIB_LKUP_RET_NOT_FWDED;
5694 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
5696 fl4.flowi4_mark = 0;
5697 fl4.flowi4_secid = 0;
5698 fl4.flowi4_tun_key.tun_id = 0;
5699 fl4.flowi4_uid = sock_net_uid(net, NULL);
5701 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF);
5705 /* map fib lookup errors to RTN_ type */
5707 return BPF_FIB_LKUP_RET_BLACKHOLE;
5708 if (err == -EHOSTUNREACH)
5709 return BPF_FIB_LKUP_RET_UNREACHABLE;
5711 return BPF_FIB_LKUP_RET_PROHIBIT;
5713 return BPF_FIB_LKUP_RET_NOT_FWDED;
5716 if (res.type != RTN_UNICAST)
5717 return BPF_FIB_LKUP_RET_NOT_FWDED;
5719 if (fib_info_num_path(res.fi) > 1)
5720 fib_select_path(net, &res, &fl4, NULL);
5723 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst);
5724 if (params->tot_len > mtu) {
5725 params->mtu_result = mtu; /* union with tot_len */
5726 return BPF_FIB_LKUP_RET_FRAG_NEEDED;
5732 /* do not handle lwt encaps right now */
5733 if (nhc->nhc_lwtstate)
5734 return BPF_FIB_LKUP_RET_UNSUPP_LWT;
5738 params->rt_metric = res.fi->fib_priority;
5739 params->ifindex = dev->ifindex;
5741 /* xdp and cls_bpf programs are run in RCU-bh so
5742 * rcu_read_lock_bh is not needed here
5744 if (likely(nhc->nhc_gw_family != AF_INET6)) {
5745 if (nhc->nhc_gw_family)
5746 params->ipv4_dst = nhc->nhc_gw.ipv4;
5748 neigh = __ipv4_neigh_lookup_noref(dev,
5749 (__force u32)params->ipv4_dst);
5751 struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst;
5753 params->family = AF_INET6;
5754 *dst = nhc->nhc_gw.ipv6;
5755 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst);
5759 return BPF_FIB_LKUP_RET_NO_NEIGH;
5761 return bpf_fib_set_fwd_params(params, neigh, dev, mtu);
5765 #if IS_ENABLED(CONFIG_IPV6)
5766 static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
5767 u32 flags, bool check_mtu)
5769 struct in6_addr *src = (struct in6_addr *) params->ipv6_src;
5770 struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst;
5771 struct fib6_result res = {};
5772 struct neighbour *neigh;
5773 struct net_device *dev;
5774 struct inet6_dev *idev;
5780 /* link local addresses are never forwarded */
5781 if (rt6_need_strict(dst) || rt6_need_strict(src))
5782 return BPF_FIB_LKUP_RET_NOT_FWDED;
5784 dev = dev_get_by_index_rcu(net, params->ifindex);
5788 idev = __in6_dev_get_safely(dev);
5789 if (unlikely(!idev || !idev->cnf.forwarding))
5790 return BPF_FIB_LKUP_RET_FWD_DISABLED;
5792 if (flags & BPF_FIB_LOOKUP_OUTPUT) {
5794 oif = fl6.flowi6_oif = params->ifindex;
5796 oif = fl6.flowi6_iif = params->ifindex;
5798 strict = RT6_LOOKUP_F_HAS_SADDR;
5800 fl6.flowlabel = params->flowinfo;
5801 fl6.flowi6_scope = 0;
5802 fl6.flowi6_flags = 0;
5805 fl6.flowi6_proto = params->l4_protocol;
5808 fl6.fl6_sport = params->sport;
5809 fl6.fl6_dport = params->dport;
5811 if (flags & BPF_FIB_LOOKUP_DIRECT) {
5812 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
5813 struct fib6_table *tb;
5815 tb = ipv6_stub->fib6_get_table(net, tbid);
5817 return BPF_FIB_LKUP_RET_NOT_FWDED;
5819 err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res,
5822 fl6.flowi6_mark = 0;
5823 fl6.flowi6_secid = 0;
5824 fl6.flowi6_tun_key.tun_id = 0;
5825 fl6.flowi6_uid = sock_net_uid(net, NULL);
5827 err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict);
5830 if (unlikely(err || IS_ERR_OR_NULL(res.f6i) ||
5831 res.f6i == net->ipv6.fib6_null_entry))
5832 return BPF_FIB_LKUP_RET_NOT_FWDED;
5834 switch (res.fib6_type) {
5835 /* only unicast is forwarded */
5839 return BPF_FIB_LKUP_RET_BLACKHOLE;
5840 case RTN_UNREACHABLE:
5841 return BPF_FIB_LKUP_RET_UNREACHABLE;
5843 return BPF_FIB_LKUP_RET_PROHIBIT;
5845 return BPF_FIB_LKUP_RET_NOT_FWDED;
5848 ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif,
5849 fl6.flowi6_oif != 0, NULL, strict);
5852 mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src);
5853 if (params->tot_len > mtu) {
5854 params->mtu_result = mtu; /* union with tot_len */
5855 return BPF_FIB_LKUP_RET_FRAG_NEEDED;
5859 if (res.nh->fib_nh_lws)
5860 return BPF_FIB_LKUP_RET_UNSUPP_LWT;
5862 if (res.nh->fib_nh_gw_family)
5863 *dst = res.nh->fib_nh_gw6;
5865 dev = res.nh->fib_nh_dev;
5866 params->rt_metric = res.f6i->fib6_metric;
5867 params->ifindex = dev->ifindex;
5869 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is
5872 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst);
5874 return BPF_FIB_LKUP_RET_NO_NEIGH;
5876 return bpf_fib_set_fwd_params(params, neigh, dev, mtu);
5880 BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx,
5881 struct bpf_fib_lookup *, params, int, plen, u32, flags)
5883 if (plen < sizeof(*params))
5886 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
5889 switch (params->family) {
5890 #if IS_ENABLED(CONFIG_INET)
5892 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params,
5895 #if IS_ENABLED(CONFIG_IPV6)
5897 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params,
5901 return -EAFNOSUPPORT;
5904 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = {
5905 .func = bpf_xdp_fib_lookup,
5907 .ret_type = RET_INTEGER,
5908 .arg1_type = ARG_PTR_TO_CTX,
5909 .arg2_type = ARG_PTR_TO_MEM,
5910 .arg3_type = ARG_CONST_SIZE,
5911 .arg4_type = ARG_ANYTHING,
5914 BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb,
5915 struct bpf_fib_lookup *, params, int, plen, u32, flags)
5917 struct net *net = dev_net(skb->dev);
5918 int rc = -EAFNOSUPPORT;
5919 bool check_mtu = false;
5921 if (plen < sizeof(*params))
5924 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
5927 if (params->tot_len)
5930 switch (params->family) {
5931 #if IS_ENABLED(CONFIG_INET)
5933 rc = bpf_ipv4_fib_lookup(net, params, flags, check_mtu);
5936 #if IS_ENABLED(CONFIG_IPV6)
5938 rc = bpf_ipv6_fib_lookup(net, params, flags, check_mtu);
5943 if (rc == BPF_FIB_LKUP_RET_SUCCESS && !check_mtu) {
5944 struct net_device *dev;
5946 /* When tot_len isn't provided by user, check skb
5947 * against MTU of FIB lookup resulting net_device
5949 dev = dev_get_by_index_rcu(net, params->ifindex);
5950 if (!is_skb_forwardable(dev, skb))
5951 rc = BPF_FIB_LKUP_RET_FRAG_NEEDED;
5953 params->mtu_result = dev->mtu; /* union with tot_len */
5959 static const struct bpf_func_proto bpf_skb_fib_lookup_proto = {
5960 .func = bpf_skb_fib_lookup,
5962 .ret_type = RET_INTEGER,
5963 .arg1_type = ARG_PTR_TO_CTX,
5964 .arg2_type = ARG_PTR_TO_MEM,
5965 .arg3_type = ARG_CONST_SIZE,
5966 .arg4_type = ARG_ANYTHING,
5969 static struct net_device *__dev_via_ifindex(struct net_device *dev_curr,
5972 struct net *netns = dev_net(dev_curr);
5974 /* Non-redirect use-cases can use ifindex=0 and save ifindex lookup */
5978 return dev_get_by_index_rcu(netns, ifindex);
5981 BPF_CALL_5(bpf_skb_check_mtu, struct sk_buff *, skb,
5982 u32, ifindex, u32 *, mtu_len, s32, len_diff, u64, flags)
5984 int ret = BPF_MTU_CHK_RET_FRAG_NEEDED;
5985 struct net_device *dev = skb->dev;
5986 int skb_len, dev_len;
5989 if (unlikely(flags & ~(BPF_MTU_CHK_SEGS)))
5992 if (unlikely(flags & BPF_MTU_CHK_SEGS && (len_diff || *mtu_len)))
5995 dev = __dev_via_ifindex(dev, ifindex);
5999 mtu = READ_ONCE(dev->mtu);
6001 dev_len = mtu + dev->hard_header_len;
6003 /* If set use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */
6004 skb_len = *mtu_len ? *mtu_len + dev->hard_header_len : skb->len;
6006 skb_len += len_diff; /* minus result pass check */
6007 if (skb_len <= dev_len) {
6008 ret = BPF_MTU_CHK_RET_SUCCESS;
6011 /* At this point, skb->len exceed MTU, but as it include length of all
6012 * segments, it can still be below MTU. The SKB can possibly get
6013 * re-segmented in transmit path (see validate_xmit_skb). Thus, user
6014 * must choose if segs are to be MTU checked.
6016 if (skb_is_gso(skb)) {
6017 ret = BPF_MTU_CHK_RET_SUCCESS;
6019 if (flags & BPF_MTU_CHK_SEGS &&
6020 !skb_gso_validate_network_len(skb, mtu))
6021 ret = BPF_MTU_CHK_RET_SEGS_TOOBIG;
6024 /* BPF verifier guarantees valid pointer */
6030 BPF_CALL_5(bpf_xdp_check_mtu, struct xdp_buff *, xdp,
6031 u32, ifindex, u32 *, mtu_len, s32, len_diff, u64, flags)
6033 struct net_device *dev = xdp->rxq->dev;
6034 int xdp_len = xdp->data_end - xdp->data;
6035 int ret = BPF_MTU_CHK_RET_SUCCESS;
6038 /* XDP variant doesn't support multi-buffer segment check (yet) */
6039 if (unlikely(flags))
6042 dev = __dev_via_ifindex(dev, ifindex);
6046 mtu = READ_ONCE(dev->mtu);
6048 /* Add L2-header as dev MTU is L3 size */
6049 dev_len = mtu + dev->hard_header_len;
6051 /* Use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */
6053 xdp_len = *mtu_len + dev->hard_header_len;
6055 xdp_len += len_diff; /* minus result pass check */
6056 if (xdp_len > dev_len)
6057 ret = BPF_MTU_CHK_RET_FRAG_NEEDED;
6059 /* BPF verifier guarantees valid pointer */
6065 static const struct bpf_func_proto bpf_skb_check_mtu_proto = {
6066 .func = bpf_skb_check_mtu,
6068 .ret_type = RET_INTEGER,
6069 .arg1_type = ARG_PTR_TO_CTX,
6070 .arg2_type = ARG_ANYTHING,
6071 .arg3_type = ARG_PTR_TO_INT,
6072 .arg4_type = ARG_ANYTHING,
6073 .arg5_type = ARG_ANYTHING,
6076 static const struct bpf_func_proto bpf_xdp_check_mtu_proto = {
6077 .func = bpf_xdp_check_mtu,
6079 .ret_type = RET_INTEGER,
6080 .arg1_type = ARG_PTR_TO_CTX,
6081 .arg2_type = ARG_ANYTHING,
6082 .arg3_type = ARG_PTR_TO_INT,
6083 .arg4_type = ARG_ANYTHING,
6084 .arg5_type = ARG_ANYTHING,
6087 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
6088 static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len)
6091 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr;
6093 if (!seg6_validate_srh(srh, len, false))
6097 case BPF_LWT_ENCAP_SEG6_INLINE:
6098 if (skb->protocol != htons(ETH_P_IPV6))
6101 err = seg6_do_srh_inline(skb, srh);
6103 case BPF_LWT_ENCAP_SEG6:
6104 skb_reset_inner_headers(skb);
6105 skb->encapsulation = 1;
6106 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6);
6112 bpf_compute_data_pointers(skb);
6116 skb_set_transport_header(skb, sizeof(struct ipv6hdr));
6118 return seg6_lookup_nexthop(skb, NULL, 0);
6120 #endif /* CONFIG_IPV6_SEG6_BPF */
6122 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
6123 static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len,
6126 return bpf_lwt_push_ip_encap(skb, hdr, len, ingress);
6130 BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr,
6134 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
6135 case BPF_LWT_ENCAP_SEG6:
6136 case BPF_LWT_ENCAP_SEG6_INLINE:
6137 return bpf_push_seg6_encap(skb, type, hdr, len);
6139 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
6140 case BPF_LWT_ENCAP_IP:
6141 return bpf_push_ip_encap(skb, hdr, len, true /* ingress */);
6148 BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type,
6149 void *, hdr, u32, len)
6152 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
6153 case BPF_LWT_ENCAP_IP:
6154 return bpf_push_ip_encap(skb, hdr, len, false /* egress */);
6161 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = {
6162 .func = bpf_lwt_in_push_encap,
6164 .ret_type = RET_INTEGER,
6165 .arg1_type = ARG_PTR_TO_CTX,
6166 .arg2_type = ARG_ANYTHING,
6167 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY,
6168 .arg4_type = ARG_CONST_SIZE
6171 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = {
6172 .func = bpf_lwt_xmit_push_encap,
6174 .ret_type = RET_INTEGER,
6175 .arg1_type = ARG_PTR_TO_CTX,
6176 .arg2_type = ARG_ANYTHING,
6177 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY,
6178 .arg4_type = ARG_CONST_SIZE
6181 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
6182 BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset,
6183 const void *, from, u32, len)
6185 struct seg6_bpf_srh_state *srh_state =
6186 this_cpu_ptr(&seg6_bpf_srh_states);
6187 struct ipv6_sr_hdr *srh = srh_state->srh;
6188 void *srh_tlvs, *srh_end, *ptr;
6194 srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4));
6195 srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen);
6197 ptr = skb->data + offset;
6198 if (ptr >= srh_tlvs && ptr + len <= srh_end)
6199 srh_state->valid = false;
6200 else if (ptr < (void *)&srh->flags ||
6201 ptr + len > (void *)&srh->segments)
6204 if (unlikely(bpf_try_make_writable(skb, offset + len)))
6206 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
6208 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
6210 memcpy(skb->data + offset, from, len);
6214 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = {
6215 .func = bpf_lwt_seg6_store_bytes,
6217 .ret_type = RET_INTEGER,
6218 .arg1_type = ARG_PTR_TO_CTX,
6219 .arg2_type = ARG_ANYTHING,
6220 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY,
6221 .arg4_type = ARG_CONST_SIZE
6224 static void bpf_update_srh_state(struct sk_buff *skb)
6226 struct seg6_bpf_srh_state *srh_state =
6227 this_cpu_ptr(&seg6_bpf_srh_states);
6230 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) {
6231 srh_state->srh = NULL;
6233 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
6234 srh_state->hdrlen = srh_state->srh->hdrlen << 3;
6235 srh_state->valid = true;
6239 BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb,
6240 u32, action, void *, param, u32, param_len)
6242 struct seg6_bpf_srh_state *srh_state =
6243 this_cpu_ptr(&seg6_bpf_srh_states);
6248 case SEG6_LOCAL_ACTION_END_X:
6249 if (!seg6_bpf_has_valid_srh(skb))
6251 if (param_len != sizeof(struct in6_addr))
6253 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0);
6254 case SEG6_LOCAL_ACTION_END_T:
6255 if (!seg6_bpf_has_valid_srh(skb))
6257 if (param_len != sizeof(int))
6259 return seg6_lookup_nexthop(skb, NULL, *(int *)param);
6260 case SEG6_LOCAL_ACTION_END_DT6:
6261 if (!seg6_bpf_has_valid_srh(skb))
6263 if (param_len != sizeof(int))
6266 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0)
6268 if (!pskb_pull(skb, hdroff))
6271 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff);
6272 skb_reset_network_header(skb);
6273 skb_reset_transport_header(skb);
6274 skb->encapsulation = 0;
6276 bpf_compute_data_pointers(skb);
6277 bpf_update_srh_state(skb);
6278 return seg6_lookup_nexthop(skb, NULL, *(int *)param);
6279 case SEG6_LOCAL_ACTION_END_B6:
6280 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
6282 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE,
6285 bpf_update_srh_state(skb);
6288 case SEG6_LOCAL_ACTION_END_B6_ENCAP:
6289 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
6291 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6,
6294 bpf_update_srh_state(skb);
6302 static const struct bpf_func_proto bpf_lwt_seg6_action_proto = {
6303 .func = bpf_lwt_seg6_action,
6305 .ret_type = RET_INTEGER,
6306 .arg1_type = ARG_PTR_TO_CTX,
6307 .arg2_type = ARG_ANYTHING,
6308 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY,
6309 .arg4_type = ARG_CONST_SIZE
6312 BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset,
6315 struct seg6_bpf_srh_state *srh_state =
6316 this_cpu_ptr(&seg6_bpf_srh_states);
6317 struct ipv6_sr_hdr *srh = srh_state->srh;
6318 void *srh_end, *srh_tlvs, *ptr;
6319 struct ipv6hdr *hdr;
6323 if (unlikely(srh == NULL))
6326 srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) +
6327 ((srh->first_segment + 1) << 4));
6328 srh_end = (void *)((unsigned char *)srh + sizeof(*srh) +
6330 ptr = skb->data + offset;
6332 if (unlikely(ptr < srh_tlvs || ptr > srh_end))
6334 if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end))
6338 ret = skb_cow_head(skb, len);
6339 if (unlikely(ret < 0))
6342 ret = bpf_skb_net_hdr_push(skb, offset, len);
6344 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len);
6347 bpf_compute_data_pointers(skb);
6348 if (unlikely(ret < 0))
6351 hdr = (struct ipv6hdr *)skb->data;
6352 hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
6354 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
6356 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
6357 srh_state->hdrlen += len;
6358 srh_state->valid = false;
6362 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = {
6363 .func = bpf_lwt_seg6_adjust_srh,
6365 .ret_type = RET_INTEGER,
6366 .arg1_type = ARG_PTR_TO_CTX,
6367 .arg2_type = ARG_ANYTHING,
6368 .arg3_type = ARG_ANYTHING,
6370 #endif /* CONFIG_IPV6_SEG6_BPF */
6373 static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple,
6374 int dif, int sdif, u8 family, u8 proto)
6376 struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo;
6377 bool refcounted = false;
6378 struct sock *sk = NULL;
6380 if (family == AF_INET) {
6381 __be32 src4 = tuple->ipv4.saddr;
6382 __be32 dst4 = tuple->ipv4.daddr;
6384 if (proto == IPPROTO_TCP)
6385 sk = __inet_lookup(net, hinfo, NULL, 0,
6386 src4, tuple->ipv4.sport,
6387 dst4, tuple->ipv4.dport,
6388 dif, sdif, &refcounted);
6390 sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport,
6391 dst4, tuple->ipv4.dport,
6392 dif, sdif, &udp_table, NULL);
6393 #if IS_ENABLED(CONFIG_IPV6)
6395 struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr;
6396 struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr;
6398 if (proto == IPPROTO_TCP)
6399 sk = __inet6_lookup(net, hinfo, NULL, 0,
6400 src6, tuple->ipv6.sport,
6401 dst6, ntohs(tuple->ipv6.dport),
6402 dif, sdif, &refcounted);
6403 else if (likely(ipv6_bpf_stub))
6404 sk = ipv6_bpf_stub->udp6_lib_lookup(net,
6405 src6, tuple->ipv6.sport,
6406 dst6, tuple->ipv6.dport,
6412 if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) {
6413 WARN_ONCE(1, "Found non-RCU, unreferenced socket!");
6419 /* bpf_skc_lookup performs the core lookup for different types of sockets,
6420 * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE.
6422 static struct sock *
6423 __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
6424 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id,
6427 struct sock *sk = NULL;
6432 if (len == sizeof(tuple->ipv4))
6434 else if (len == sizeof(tuple->ipv6))
6439 if (unlikely(flags || !((s32)netns_id < 0 || netns_id <= S32_MAX)))
6442 if (family == AF_INET)
6443 sdif = inet_sdif(skb);
6445 sdif = inet6_sdif(skb);
6447 if ((s32)netns_id < 0) {
6449 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto);
6451 net = get_net_ns_by_id(caller_net, netns_id);
6454 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto);
6462 static struct sock *
6463 __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
6464 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id,
6467 struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net,
6468 ifindex, proto, netns_id, flags);
6471 struct sock *sk2 = sk_to_full_sk(sk);
6473 /* sk_to_full_sk() may return (sk)->rsk_listener, so make sure the original sk
6474 * sock refcnt is decremented to prevent a request_sock leak.
6476 if (!sk_fullsock(sk2))
6480 /* Ensure there is no need to bump sk2 refcnt */
6481 if (unlikely(sk2 && !sock_flag(sk2, SOCK_RCU_FREE))) {
6482 WARN_ONCE(1, "Found non-RCU, unreferenced socket!");
6492 static struct sock *
6493 bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
6494 u8 proto, u64 netns_id, u64 flags)
6496 struct net *caller_net;
6500 caller_net = dev_net(skb->dev);
6501 ifindex = skb->dev->ifindex;
6503 caller_net = sock_net(skb->sk);
6507 return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto,
6511 static struct sock *
6512 bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
6513 u8 proto, u64 netns_id, u64 flags)
6515 struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id,
6519 struct sock *sk2 = sk_to_full_sk(sk);
6521 /* sk_to_full_sk() may return (sk)->rsk_listener, so make sure the original sk
6522 * sock refcnt is decremented to prevent a request_sock leak.
6524 if (!sk_fullsock(sk2))
6528 /* Ensure there is no need to bump sk2 refcnt */
6529 if (unlikely(sk2 && !sock_flag(sk2, SOCK_RCU_FREE))) {
6530 WARN_ONCE(1, "Found non-RCU, unreferenced socket!");
6540 BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb,
6541 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6543 return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP,
6547 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = {
6548 .func = bpf_skc_lookup_tcp,
6551 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL,
6552 .arg1_type = ARG_PTR_TO_CTX,
6553 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
6554 .arg3_type = ARG_CONST_SIZE,
6555 .arg4_type = ARG_ANYTHING,
6556 .arg5_type = ARG_ANYTHING,
6559 BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb,
6560 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6562 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP,
6566 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = {
6567 .func = bpf_sk_lookup_tcp,
6570 .ret_type = RET_PTR_TO_SOCKET_OR_NULL,
6571 .arg1_type = ARG_PTR_TO_CTX,
6572 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
6573 .arg3_type = ARG_CONST_SIZE,
6574 .arg4_type = ARG_ANYTHING,
6575 .arg5_type = ARG_ANYTHING,
6578 BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb,
6579 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6581 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP,
6585 static const struct bpf_func_proto bpf_sk_lookup_udp_proto = {
6586 .func = bpf_sk_lookup_udp,
6589 .ret_type = RET_PTR_TO_SOCKET_OR_NULL,
6590 .arg1_type = ARG_PTR_TO_CTX,
6591 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
6592 .arg3_type = ARG_CONST_SIZE,
6593 .arg4_type = ARG_ANYTHING,
6594 .arg5_type = ARG_ANYTHING,
6597 BPF_CALL_1(bpf_sk_release, struct sock *, sk)
6599 if (sk && sk_is_refcounted(sk))
6604 static const struct bpf_func_proto bpf_sk_release_proto = {
6605 .func = bpf_sk_release,
6607 .ret_type = RET_INTEGER,
6608 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON | OBJ_RELEASE,
6611 BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx,
6612 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
6614 struct net *caller_net = dev_net(ctx->rxq->dev);
6615 int ifindex = ctx->rxq->dev->ifindex;
6617 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net,
6618 ifindex, IPPROTO_UDP, netns_id,
6622 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = {
6623 .func = bpf_xdp_sk_lookup_udp,
6626 .ret_type = RET_PTR_TO_SOCKET_OR_NULL,
6627 .arg1_type = ARG_PTR_TO_CTX,
6628 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
6629 .arg3_type = ARG_CONST_SIZE,
6630 .arg4_type = ARG_ANYTHING,
6631 .arg5_type = ARG_ANYTHING,
6634 BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx,
6635 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
6637 struct net *caller_net = dev_net(ctx->rxq->dev);
6638 int ifindex = ctx->rxq->dev->ifindex;
6640 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net,
6641 ifindex, IPPROTO_TCP, netns_id,
6645 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = {
6646 .func = bpf_xdp_skc_lookup_tcp,
6649 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL,
6650 .arg1_type = ARG_PTR_TO_CTX,
6651 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
6652 .arg3_type = ARG_CONST_SIZE,
6653 .arg4_type = ARG_ANYTHING,
6654 .arg5_type = ARG_ANYTHING,
6657 BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx,
6658 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
6660 struct net *caller_net = dev_net(ctx->rxq->dev);
6661 int ifindex = ctx->rxq->dev->ifindex;
6663 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net,
6664 ifindex, IPPROTO_TCP, netns_id,
6668 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = {
6669 .func = bpf_xdp_sk_lookup_tcp,
6672 .ret_type = RET_PTR_TO_SOCKET_OR_NULL,
6673 .arg1_type = ARG_PTR_TO_CTX,
6674 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
6675 .arg3_type = ARG_CONST_SIZE,
6676 .arg4_type = ARG_ANYTHING,
6677 .arg5_type = ARG_ANYTHING,
6680 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx,
6681 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6683 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len,
6684 sock_net(ctx->sk), 0,
6685 IPPROTO_TCP, netns_id, flags);
6688 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = {
6689 .func = bpf_sock_addr_skc_lookup_tcp,
6691 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL,
6692 .arg1_type = ARG_PTR_TO_CTX,
6693 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
6694 .arg3_type = ARG_CONST_SIZE,
6695 .arg4_type = ARG_ANYTHING,
6696 .arg5_type = ARG_ANYTHING,
6699 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx,
6700 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6702 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len,
6703 sock_net(ctx->sk), 0, IPPROTO_TCP,
6707 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = {
6708 .func = bpf_sock_addr_sk_lookup_tcp,
6710 .ret_type = RET_PTR_TO_SOCKET_OR_NULL,
6711 .arg1_type = ARG_PTR_TO_CTX,
6712 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
6713 .arg3_type = ARG_CONST_SIZE,
6714 .arg4_type = ARG_ANYTHING,
6715 .arg5_type = ARG_ANYTHING,
6718 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx,
6719 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6721 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len,
6722 sock_net(ctx->sk), 0, IPPROTO_UDP,
6726 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = {
6727 .func = bpf_sock_addr_sk_lookup_udp,
6729 .ret_type = RET_PTR_TO_SOCKET_OR_NULL,
6730 .arg1_type = ARG_PTR_TO_CTX,
6731 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
6732 .arg3_type = ARG_CONST_SIZE,
6733 .arg4_type = ARG_ANYTHING,
6734 .arg5_type = ARG_ANYTHING,
6737 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
6738 struct bpf_insn_access_aux *info)
6740 if (off < 0 || off >= offsetofend(struct bpf_tcp_sock,
6744 if (off % size != 0)
6748 case offsetof(struct bpf_tcp_sock, bytes_received):
6749 case offsetof(struct bpf_tcp_sock, bytes_acked):
6750 return size == sizeof(__u64);
6752 return size == sizeof(__u32);
6756 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
6757 const struct bpf_insn *si,
6758 struct bpf_insn *insn_buf,
6759 struct bpf_prog *prog, u32 *target_size)
6761 struct bpf_insn *insn = insn_buf;
6763 #define BPF_TCP_SOCK_GET_COMMON(FIELD) \
6765 BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) > \
6766 sizeof_field(struct bpf_tcp_sock, FIELD)); \
6767 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\
6768 si->dst_reg, si->src_reg, \
6769 offsetof(struct tcp_sock, FIELD)); \
6772 #define BPF_INET_SOCK_GET_COMMON(FIELD) \
6774 BUILD_BUG_ON(sizeof_field(struct inet_connection_sock, \
6776 sizeof_field(struct bpf_tcp_sock, FIELD)); \
6777 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
6778 struct inet_connection_sock, \
6780 si->dst_reg, si->src_reg, \
6782 struct inet_connection_sock, \
6786 if (insn > insn_buf)
6787 return insn - insn_buf;
6790 case offsetof(struct bpf_tcp_sock, rtt_min):
6791 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) !=
6792 sizeof(struct minmax));
6793 BUILD_BUG_ON(sizeof(struct minmax) <
6794 sizeof(struct minmax_sample));
6796 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
6797 offsetof(struct tcp_sock, rtt_min) +
6798 offsetof(struct minmax_sample, v));
6800 case offsetof(struct bpf_tcp_sock, snd_cwnd):
6801 BPF_TCP_SOCK_GET_COMMON(snd_cwnd);
6803 case offsetof(struct bpf_tcp_sock, srtt_us):
6804 BPF_TCP_SOCK_GET_COMMON(srtt_us);
6806 case offsetof(struct bpf_tcp_sock, snd_ssthresh):
6807 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh);
6809 case offsetof(struct bpf_tcp_sock, rcv_nxt):
6810 BPF_TCP_SOCK_GET_COMMON(rcv_nxt);
6812 case offsetof(struct bpf_tcp_sock, snd_nxt):
6813 BPF_TCP_SOCK_GET_COMMON(snd_nxt);
6815 case offsetof(struct bpf_tcp_sock, snd_una):
6816 BPF_TCP_SOCK_GET_COMMON(snd_una);
6818 case offsetof(struct bpf_tcp_sock, mss_cache):
6819 BPF_TCP_SOCK_GET_COMMON(mss_cache);
6821 case offsetof(struct bpf_tcp_sock, ecn_flags):
6822 BPF_TCP_SOCK_GET_COMMON(ecn_flags);
6824 case offsetof(struct bpf_tcp_sock, rate_delivered):
6825 BPF_TCP_SOCK_GET_COMMON(rate_delivered);
6827 case offsetof(struct bpf_tcp_sock, rate_interval_us):
6828 BPF_TCP_SOCK_GET_COMMON(rate_interval_us);
6830 case offsetof(struct bpf_tcp_sock, packets_out):
6831 BPF_TCP_SOCK_GET_COMMON(packets_out);
6833 case offsetof(struct bpf_tcp_sock, retrans_out):
6834 BPF_TCP_SOCK_GET_COMMON(retrans_out);
6836 case offsetof(struct bpf_tcp_sock, total_retrans):
6837 BPF_TCP_SOCK_GET_COMMON(total_retrans);
6839 case offsetof(struct bpf_tcp_sock, segs_in):
6840 BPF_TCP_SOCK_GET_COMMON(segs_in);
6842 case offsetof(struct bpf_tcp_sock, data_segs_in):
6843 BPF_TCP_SOCK_GET_COMMON(data_segs_in);
6845 case offsetof(struct bpf_tcp_sock, segs_out):
6846 BPF_TCP_SOCK_GET_COMMON(segs_out);
6848 case offsetof(struct bpf_tcp_sock, data_segs_out):
6849 BPF_TCP_SOCK_GET_COMMON(data_segs_out);
6851 case offsetof(struct bpf_tcp_sock, lost_out):
6852 BPF_TCP_SOCK_GET_COMMON(lost_out);
6854 case offsetof(struct bpf_tcp_sock, sacked_out):
6855 BPF_TCP_SOCK_GET_COMMON(sacked_out);
6857 case offsetof(struct bpf_tcp_sock, bytes_received):
6858 BPF_TCP_SOCK_GET_COMMON(bytes_received);
6860 case offsetof(struct bpf_tcp_sock, bytes_acked):
6861 BPF_TCP_SOCK_GET_COMMON(bytes_acked);
6863 case offsetof(struct bpf_tcp_sock, dsack_dups):
6864 BPF_TCP_SOCK_GET_COMMON(dsack_dups);
6866 case offsetof(struct bpf_tcp_sock, delivered):
6867 BPF_TCP_SOCK_GET_COMMON(delivered);
6869 case offsetof(struct bpf_tcp_sock, delivered_ce):
6870 BPF_TCP_SOCK_GET_COMMON(delivered_ce);
6872 case offsetof(struct bpf_tcp_sock, icsk_retransmits):
6873 BPF_INET_SOCK_GET_COMMON(icsk_retransmits);
6877 return insn - insn_buf;
6880 BPF_CALL_1(bpf_tcp_sock, struct sock *, sk)
6882 if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP)
6883 return (unsigned long)sk;
6885 return (unsigned long)NULL;
6888 const struct bpf_func_proto bpf_tcp_sock_proto = {
6889 .func = bpf_tcp_sock,
6891 .ret_type = RET_PTR_TO_TCP_SOCK_OR_NULL,
6892 .arg1_type = ARG_PTR_TO_SOCK_COMMON,
6895 BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk)
6897 sk = sk_to_full_sk(sk);
6899 if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE))
6900 return (unsigned long)sk;
6902 return (unsigned long)NULL;
6905 static const struct bpf_func_proto bpf_get_listener_sock_proto = {
6906 .func = bpf_get_listener_sock,
6908 .ret_type = RET_PTR_TO_SOCKET_OR_NULL,
6909 .arg1_type = ARG_PTR_TO_SOCK_COMMON,
6912 BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb)
6914 unsigned int iphdr_len;
6916 switch (skb_protocol(skb, true)) {
6917 case cpu_to_be16(ETH_P_IP):
6918 iphdr_len = sizeof(struct iphdr);
6920 case cpu_to_be16(ETH_P_IPV6):
6921 iphdr_len = sizeof(struct ipv6hdr);
6927 if (skb_headlen(skb) < iphdr_len)
6930 if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len))
6933 return INET_ECN_set_ce(skb);
6936 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
6937 struct bpf_insn_access_aux *info)
6939 if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id))
6942 if (off % size != 0)
6947 return size == sizeof(__u32);
6951 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
6952 const struct bpf_insn *si,
6953 struct bpf_insn *insn_buf,
6954 struct bpf_prog *prog, u32 *target_size)
6956 struct bpf_insn *insn = insn_buf;
6958 #define BPF_XDP_SOCK_GET(FIELD) \
6960 BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) > \
6961 sizeof_field(struct bpf_xdp_sock, FIELD)); \
6962 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\
6963 si->dst_reg, si->src_reg, \
6964 offsetof(struct xdp_sock, FIELD)); \
6968 case offsetof(struct bpf_xdp_sock, queue_id):
6969 BPF_XDP_SOCK_GET(queue_id);
6973 return insn - insn_buf;
6976 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = {
6977 .func = bpf_skb_ecn_set_ce,
6979 .ret_type = RET_INTEGER,
6980 .arg1_type = ARG_PTR_TO_CTX,
6983 BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len,
6984 struct tcphdr *, th, u32, th_len)
6986 #ifdef CONFIG_SYN_COOKIES
6990 if (unlikely(!sk || th_len < sizeof(*th)))
6993 /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */
6994 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN)
6997 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies))
7000 if (!th->ack || th->rst || th->syn)
7003 if (unlikely(iph_len < sizeof(struct iphdr)))
7006 if (tcp_synq_no_recent_overflow(sk))
7009 cookie = ntohl(th->ack_seq) - 1;
7011 /* Both struct iphdr and struct ipv6hdr have the version field at the
7012 * same offset so we can cast to the shorter header (struct iphdr).
7014 switch (((struct iphdr *)iph)->version) {
7016 if (sk->sk_family == AF_INET6 && ipv6_only_sock(sk))
7019 ret = __cookie_v4_check((struct iphdr *)iph, th, cookie);
7022 #if IS_BUILTIN(CONFIG_IPV6)
7024 if (unlikely(iph_len < sizeof(struct ipv6hdr)))
7027 if (sk->sk_family != AF_INET6)
7030 ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie);
7032 #endif /* CONFIG_IPV6 */
7035 return -EPROTONOSUPPORT;
7047 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = {
7048 .func = bpf_tcp_check_syncookie,
7051 .ret_type = RET_INTEGER,
7052 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
7053 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
7054 .arg3_type = ARG_CONST_SIZE,
7055 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY,
7056 .arg5_type = ARG_CONST_SIZE,
7059 BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len,
7060 struct tcphdr *, th, u32, th_len)
7062 #ifdef CONFIG_SYN_COOKIES
7066 if (unlikely(!sk || th_len < sizeof(*th) || th_len != th->doff * 4))
7069 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN)
7072 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies))
7075 if (!th->syn || th->ack || th->fin || th->rst)
7078 if (unlikely(iph_len < sizeof(struct iphdr)))
7081 /* Both struct iphdr and struct ipv6hdr have the version field at the
7082 * same offset so we can cast to the shorter header (struct iphdr).
7084 switch (((struct iphdr *)iph)->version) {
7086 if (sk->sk_family == AF_INET6 && ipv6_only_sock(sk))
7089 mss = tcp_v4_get_syncookie(sk, iph, th, &cookie);
7092 #if IS_BUILTIN(CONFIG_IPV6)
7094 if (unlikely(iph_len < sizeof(struct ipv6hdr)))
7097 if (sk->sk_family != AF_INET6)
7100 mss = tcp_v6_get_syncookie(sk, iph, th, &cookie);
7102 #endif /* CONFIG_IPV6 */
7105 return -EPROTONOSUPPORT;
7110 return cookie | ((u64)mss << 32);
7113 #endif /* CONFIG_SYN_COOKIES */
7116 static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = {
7117 .func = bpf_tcp_gen_syncookie,
7118 .gpl_only = true, /* __cookie_v*_init_sequence() is GPL */
7120 .ret_type = RET_INTEGER,
7121 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
7122 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
7123 .arg3_type = ARG_CONST_SIZE,
7124 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY,
7125 .arg5_type = ARG_CONST_SIZE,
7128 BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags)
7130 if (!sk || flags != 0)
7132 if (!skb_at_tc_ingress(skb))
7134 if (unlikely(dev_net(skb->dev) != sock_net(sk)))
7135 return -ENETUNREACH;
7136 if (unlikely(sk_fullsock(sk) && sk->sk_reuseport))
7137 return -ESOCKTNOSUPPORT;
7138 if (sk_is_refcounted(sk) &&
7139 unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
7144 skb->destructor = sock_pfree;
7149 static const struct bpf_func_proto bpf_sk_assign_proto = {
7150 .func = bpf_sk_assign,
7152 .ret_type = RET_INTEGER,
7153 .arg1_type = ARG_PTR_TO_CTX,
7154 .arg2_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
7155 .arg3_type = ARG_ANYTHING,
7158 static const u8 *bpf_search_tcp_opt(const u8 *op, const u8 *opend,
7159 u8 search_kind, const u8 *magic,
7160 u8 magic_len, bool *eol)
7166 while (op < opend) {
7169 if (kind == TCPOPT_EOL) {
7171 return ERR_PTR(-ENOMSG);
7172 } else if (kind == TCPOPT_NOP) {
7177 if (opend - op < 2 || opend - op < op[1] || op[1] < 2)
7178 /* Something is wrong in the received header.
7179 * Follow the TCP stack's tcp_parse_options()
7180 * and just bail here.
7182 return ERR_PTR(-EFAULT);
7185 if (search_kind == kind) {
7189 if (magic_len > kind_len - 2)
7190 return ERR_PTR(-ENOMSG);
7192 if (!memcmp(&op[2], magic, magic_len))
7199 return ERR_PTR(-ENOMSG);
7202 BPF_CALL_4(bpf_sock_ops_load_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock,
7203 void *, search_res, u32, len, u64, flags)
7205 bool eol, load_syn = flags & BPF_LOAD_HDR_OPT_TCP_SYN;
7206 const u8 *op, *opend, *magic, *search = search_res;
7207 u8 search_kind, search_len, copy_len, magic_len;
7210 /* 2 byte is the minimal option len except TCPOPT_NOP and
7211 * TCPOPT_EOL which are useless for the bpf prog to learn
7212 * and this helper disallow loading them also.
7214 if (len < 2 || flags & ~BPF_LOAD_HDR_OPT_TCP_SYN)
7217 search_kind = search[0];
7218 search_len = search[1];
7220 if (search_len > len || search_kind == TCPOPT_NOP ||
7221 search_kind == TCPOPT_EOL)
7224 if (search_kind == TCPOPT_EXP || search_kind == 253) {
7225 /* 16 or 32 bit magic. +2 for kind and kind length */
7226 if (search_len != 4 && search_len != 6)
7229 magic_len = search_len - 2;
7238 ret = bpf_sock_ops_get_syn(bpf_sock, TCP_BPF_SYN, &op);
7243 op += sizeof(struct tcphdr);
7245 if (!bpf_sock->skb ||
7246 bpf_sock->op == BPF_SOCK_OPS_HDR_OPT_LEN_CB)
7247 /* This bpf_sock->op cannot call this helper */
7250 opend = bpf_sock->skb_data_end;
7251 op = bpf_sock->skb->data + sizeof(struct tcphdr);
7254 op = bpf_search_tcp_opt(op, opend, search_kind, magic, magic_len,
7261 if (copy_len > len) {
7266 memcpy(search_res, op, copy_len);
7270 static const struct bpf_func_proto bpf_sock_ops_load_hdr_opt_proto = {
7271 .func = bpf_sock_ops_load_hdr_opt,
7273 .ret_type = RET_INTEGER,
7274 .arg1_type = ARG_PTR_TO_CTX,
7275 .arg2_type = ARG_PTR_TO_MEM,
7276 .arg3_type = ARG_CONST_SIZE,
7277 .arg4_type = ARG_ANYTHING,
7280 BPF_CALL_4(bpf_sock_ops_store_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock,
7281 const void *, from, u32, len, u64, flags)
7283 u8 new_kind, new_kind_len, magic_len = 0, *opend;
7284 const u8 *op, *new_op, *magic = NULL;
7285 struct sk_buff *skb;
7288 if (bpf_sock->op != BPF_SOCK_OPS_WRITE_HDR_OPT_CB)
7291 if (len < 2 || flags)
7295 new_kind = new_op[0];
7296 new_kind_len = new_op[1];
7298 if (new_kind_len > len || new_kind == TCPOPT_NOP ||
7299 new_kind == TCPOPT_EOL)
7302 if (new_kind_len > bpf_sock->remaining_opt_len)
7305 /* 253 is another experimental kind */
7306 if (new_kind == TCPOPT_EXP || new_kind == 253) {
7307 if (new_kind_len < 4)
7309 /* Match for the 2 byte magic also.
7310 * RFC 6994: the magic could be 2 or 4 bytes.
7311 * Hence, matching by 2 byte only is on the
7312 * conservative side but it is the right
7313 * thing to do for the 'search-for-duplication'
7320 /* Check for duplication */
7321 skb = bpf_sock->skb;
7322 op = skb->data + sizeof(struct tcphdr);
7323 opend = bpf_sock->skb_data_end;
7325 op = bpf_search_tcp_opt(op, opend, new_kind, magic, magic_len,
7330 if (PTR_ERR(op) != -ENOMSG)
7334 /* The option has been ended. Treat it as no more
7335 * header option can be written.
7339 /* No duplication found. Store the header option. */
7340 memcpy(opend, from, new_kind_len);
7342 bpf_sock->remaining_opt_len -= new_kind_len;
7343 bpf_sock->skb_data_end += new_kind_len;
7348 static const struct bpf_func_proto bpf_sock_ops_store_hdr_opt_proto = {
7349 .func = bpf_sock_ops_store_hdr_opt,
7351 .ret_type = RET_INTEGER,
7352 .arg1_type = ARG_PTR_TO_CTX,
7353 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
7354 .arg3_type = ARG_CONST_SIZE,
7355 .arg4_type = ARG_ANYTHING,
7358 BPF_CALL_3(bpf_sock_ops_reserve_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock,
7359 u32, len, u64, flags)
7361 if (bpf_sock->op != BPF_SOCK_OPS_HDR_OPT_LEN_CB)
7364 if (flags || len < 2)
7367 if (len > bpf_sock->remaining_opt_len)
7370 bpf_sock->remaining_opt_len -= len;
7375 static const struct bpf_func_proto bpf_sock_ops_reserve_hdr_opt_proto = {
7376 .func = bpf_sock_ops_reserve_hdr_opt,
7378 .ret_type = RET_INTEGER,
7379 .arg1_type = ARG_PTR_TO_CTX,
7380 .arg2_type = ARG_ANYTHING,
7381 .arg3_type = ARG_ANYTHING,
7384 BPF_CALL_3(bpf_skb_set_tstamp, struct sk_buff *, skb,
7385 u64, tstamp, u32, tstamp_type)
7387 /* skb_clear_delivery_time() is done for inet protocol */
7388 if (skb->protocol != htons(ETH_P_IP) &&
7389 skb->protocol != htons(ETH_P_IPV6))
7392 switch (tstamp_type) {
7393 case BPF_SKB_TSTAMP_DELIVERY_MONO:
7396 skb->tstamp = tstamp;
7397 skb->mono_delivery_time = 1;
7399 case BPF_SKB_TSTAMP_UNSPEC:
7403 skb->mono_delivery_time = 0;
7412 static const struct bpf_func_proto bpf_skb_set_tstamp_proto = {
7413 .func = bpf_skb_set_tstamp,
7415 .ret_type = RET_INTEGER,
7416 .arg1_type = ARG_PTR_TO_CTX,
7417 .arg2_type = ARG_ANYTHING,
7418 .arg3_type = ARG_ANYTHING,
7421 #ifdef CONFIG_SYN_COOKIES
7422 BPF_CALL_3(bpf_tcp_raw_gen_syncookie_ipv4, struct iphdr *, iph,
7423 struct tcphdr *, th, u32, th_len)
7428 if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4))
7431 mss = tcp_parse_mss_option(th, 0) ?: TCP_MSS_DEFAULT;
7432 cookie = __cookie_v4_init_sequence(iph, th, &mss);
7434 return cookie | ((u64)mss << 32);
7437 static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv4_proto = {
7438 .func = bpf_tcp_raw_gen_syncookie_ipv4,
7439 .gpl_only = true, /* __cookie_v4_init_sequence() is GPL */
7441 .ret_type = RET_INTEGER,
7442 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM,
7443 .arg1_size = sizeof(struct iphdr),
7444 .arg2_type = ARG_PTR_TO_MEM,
7445 .arg3_type = ARG_CONST_SIZE,
7448 BPF_CALL_3(bpf_tcp_raw_gen_syncookie_ipv6, struct ipv6hdr *, iph,
7449 struct tcphdr *, th, u32, th_len)
7451 #if IS_BUILTIN(CONFIG_IPV6)
7452 const u16 mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) -
7453 sizeof(struct ipv6hdr);
7457 if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4))
7460 mss = tcp_parse_mss_option(th, 0) ?: mss_clamp;
7461 cookie = __cookie_v6_init_sequence(iph, th, &mss);
7463 return cookie | ((u64)mss << 32);
7465 return -EPROTONOSUPPORT;
7469 static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv6_proto = {
7470 .func = bpf_tcp_raw_gen_syncookie_ipv6,
7471 .gpl_only = true, /* __cookie_v6_init_sequence() is GPL */
7473 .ret_type = RET_INTEGER,
7474 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM,
7475 .arg1_size = sizeof(struct ipv6hdr),
7476 .arg2_type = ARG_PTR_TO_MEM,
7477 .arg3_type = ARG_CONST_SIZE,
7480 BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv4, struct iphdr *, iph,
7481 struct tcphdr *, th)
7483 u32 cookie = ntohl(th->ack_seq) - 1;
7485 if (__cookie_v4_check(iph, th, cookie) > 0)
7491 static const struct bpf_func_proto bpf_tcp_raw_check_syncookie_ipv4_proto = {
7492 .func = bpf_tcp_raw_check_syncookie_ipv4,
7493 .gpl_only = true, /* __cookie_v4_check is GPL */
7495 .ret_type = RET_INTEGER,
7496 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM,
7497 .arg1_size = sizeof(struct iphdr),
7498 .arg2_type = ARG_PTR_TO_FIXED_SIZE_MEM,
7499 .arg2_size = sizeof(struct tcphdr),
7502 BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv6, struct ipv6hdr *, iph,
7503 struct tcphdr *, th)
7505 #if IS_BUILTIN(CONFIG_IPV6)
7506 u32 cookie = ntohl(th->ack_seq) - 1;
7508 if (__cookie_v6_check(iph, th, cookie) > 0)
7513 return -EPROTONOSUPPORT;
7517 static const struct bpf_func_proto bpf_tcp_raw_check_syncookie_ipv6_proto = {
7518 .func = bpf_tcp_raw_check_syncookie_ipv6,
7519 .gpl_only = true, /* __cookie_v6_check is GPL */
7521 .ret_type = RET_INTEGER,
7522 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM,
7523 .arg1_size = sizeof(struct ipv6hdr),
7524 .arg2_type = ARG_PTR_TO_FIXED_SIZE_MEM,
7525 .arg2_size = sizeof(struct tcphdr),
7527 #endif /* CONFIG_SYN_COOKIES */
7529 #endif /* CONFIG_INET */
7531 bool bpf_helper_changes_pkt_data(void *func)
7533 if (func == bpf_skb_vlan_push ||
7534 func == bpf_skb_vlan_pop ||
7535 func == bpf_skb_store_bytes ||
7536 func == bpf_skb_change_proto ||
7537 func == bpf_skb_change_head ||
7538 func == sk_skb_change_head ||
7539 func == bpf_skb_change_tail ||
7540 func == sk_skb_change_tail ||
7541 func == bpf_skb_adjust_room ||
7542 func == sk_skb_adjust_room ||
7543 func == bpf_skb_pull_data ||
7544 func == sk_skb_pull_data ||
7545 func == bpf_clone_redirect ||
7546 func == bpf_l3_csum_replace ||
7547 func == bpf_l4_csum_replace ||
7548 func == bpf_xdp_adjust_head ||
7549 func == bpf_xdp_adjust_meta ||
7550 func == bpf_msg_pull_data ||
7551 func == bpf_msg_push_data ||
7552 func == bpf_msg_pop_data ||
7553 func == bpf_xdp_adjust_tail ||
7554 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
7555 func == bpf_lwt_seg6_store_bytes ||
7556 func == bpf_lwt_seg6_adjust_srh ||
7557 func == bpf_lwt_seg6_action ||
7560 func == bpf_sock_ops_store_hdr_opt ||
7562 func == bpf_lwt_in_push_encap ||
7563 func == bpf_lwt_xmit_push_encap)
7569 const struct bpf_func_proto bpf_event_output_data_proto __weak;
7570 const struct bpf_func_proto bpf_sk_storage_get_cg_sock_proto __weak;
7572 static const struct bpf_func_proto *
7573 sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7575 const struct bpf_func_proto *func_proto;
7577 func_proto = cgroup_common_func_proto(func_id, prog);
7581 func_proto = cgroup_current_func_proto(func_id, prog);
7586 case BPF_FUNC_get_socket_cookie:
7587 return &bpf_get_socket_cookie_sock_proto;
7588 case BPF_FUNC_get_netns_cookie:
7589 return &bpf_get_netns_cookie_sock_proto;
7590 case BPF_FUNC_perf_event_output:
7591 return &bpf_event_output_data_proto;
7592 case BPF_FUNC_sk_storage_get:
7593 return &bpf_sk_storage_get_cg_sock_proto;
7594 case BPF_FUNC_ktime_get_coarse_ns:
7595 return &bpf_ktime_get_coarse_ns_proto;
7597 return bpf_base_func_proto(func_id);
7601 static const struct bpf_func_proto *
7602 sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7604 const struct bpf_func_proto *func_proto;
7606 func_proto = cgroup_common_func_proto(func_id, prog);
7610 func_proto = cgroup_current_func_proto(func_id, prog);
7616 switch (prog->expected_attach_type) {
7617 case BPF_CGROUP_INET4_CONNECT:
7618 case BPF_CGROUP_INET6_CONNECT:
7619 return &bpf_bind_proto;
7623 case BPF_FUNC_get_socket_cookie:
7624 return &bpf_get_socket_cookie_sock_addr_proto;
7625 case BPF_FUNC_get_netns_cookie:
7626 return &bpf_get_netns_cookie_sock_addr_proto;
7627 case BPF_FUNC_perf_event_output:
7628 return &bpf_event_output_data_proto;
7630 case BPF_FUNC_sk_lookup_tcp:
7631 return &bpf_sock_addr_sk_lookup_tcp_proto;
7632 case BPF_FUNC_sk_lookup_udp:
7633 return &bpf_sock_addr_sk_lookup_udp_proto;
7634 case BPF_FUNC_sk_release:
7635 return &bpf_sk_release_proto;
7636 case BPF_FUNC_skc_lookup_tcp:
7637 return &bpf_sock_addr_skc_lookup_tcp_proto;
7638 #endif /* CONFIG_INET */
7639 case BPF_FUNC_sk_storage_get:
7640 return &bpf_sk_storage_get_proto;
7641 case BPF_FUNC_sk_storage_delete:
7642 return &bpf_sk_storage_delete_proto;
7643 case BPF_FUNC_setsockopt:
7644 switch (prog->expected_attach_type) {
7645 case BPF_CGROUP_INET4_BIND:
7646 case BPF_CGROUP_INET6_BIND:
7647 case BPF_CGROUP_INET4_CONNECT:
7648 case BPF_CGROUP_INET6_CONNECT:
7649 case BPF_CGROUP_UDP4_RECVMSG:
7650 case BPF_CGROUP_UDP6_RECVMSG:
7651 case BPF_CGROUP_UDP4_SENDMSG:
7652 case BPF_CGROUP_UDP6_SENDMSG:
7653 case BPF_CGROUP_INET4_GETPEERNAME:
7654 case BPF_CGROUP_INET6_GETPEERNAME:
7655 case BPF_CGROUP_INET4_GETSOCKNAME:
7656 case BPF_CGROUP_INET6_GETSOCKNAME:
7657 return &bpf_sock_addr_setsockopt_proto;
7661 case BPF_FUNC_getsockopt:
7662 switch (prog->expected_attach_type) {
7663 case BPF_CGROUP_INET4_BIND:
7664 case BPF_CGROUP_INET6_BIND:
7665 case BPF_CGROUP_INET4_CONNECT:
7666 case BPF_CGROUP_INET6_CONNECT:
7667 case BPF_CGROUP_UDP4_RECVMSG:
7668 case BPF_CGROUP_UDP6_RECVMSG:
7669 case BPF_CGROUP_UDP4_SENDMSG:
7670 case BPF_CGROUP_UDP6_SENDMSG:
7671 case BPF_CGROUP_INET4_GETPEERNAME:
7672 case BPF_CGROUP_INET6_GETPEERNAME:
7673 case BPF_CGROUP_INET4_GETSOCKNAME:
7674 case BPF_CGROUP_INET6_GETSOCKNAME:
7675 return &bpf_sock_addr_getsockopt_proto;
7680 return bpf_sk_base_func_proto(func_id);
7684 static const struct bpf_func_proto *
7685 sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7688 case BPF_FUNC_skb_load_bytes:
7689 return &bpf_skb_load_bytes_proto;
7690 case BPF_FUNC_skb_load_bytes_relative:
7691 return &bpf_skb_load_bytes_relative_proto;
7692 case BPF_FUNC_get_socket_cookie:
7693 return &bpf_get_socket_cookie_proto;
7694 case BPF_FUNC_get_socket_uid:
7695 return &bpf_get_socket_uid_proto;
7696 case BPF_FUNC_perf_event_output:
7697 return &bpf_skb_event_output_proto;
7699 return bpf_sk_base_func_proto(func_id);
7703 const struct bpf_func_proto bpf_sk_storage_get_proto __weak;
7704 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak;
7706 static const struct bpf_func_proto *
7707 cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7709 const struct bpf_func_proto *func_proto;
7711 func_proto = cgroup_common_func_proto(func_id, prog);
7716 case BPF_FUNC_sk_fullsock:
7717 return &bpf_sk_fullsock_proto;
7718 case BPF_FUNC_sk_storage_get:
7719 return &bpf_sk_storage_get_proto;
7720 case BPF_FUNC_sk_storage_delete:
7721 return &bpf_sk_storage_delete_proto;
7722 case BPF_FUNC_perf_event_output:
7723 return &bpf_skb_event_output_proto;
7724 #ifdef CONFIG_SOCK_CGROUP_DATA
7725 case BPF_FUNC_skb_cgroup_id:
7726 return &bpf_skb_cgroup_id_proto;
7727 case BPF_FUNC_skb_ancestor_cgroup_id:
7728 return &bpf_skb_ancestor_cgroup_id_proto;
7729 case BPF_FUNC_sk_cgroup_id:
7730 return &bpf_sk_cgroup_id_proto;
7731 case BPF_FUNC_sk_ancestor_cgroup_id:
7732 return &bpf_sk_ancestor_cgroup_id_proto;
7735 case BPF_FUNC_sk_lookup_tcp:
7736 return &bpf_sk_lookup_tcp_proto;
7737 case BPF_FUNC_sk_lookup_udp:
7738 return &bpf_sk_lookup_udp_proto;
7739 case BPF_FUNC_sk_release:
7740 return &bpf_sk_release_proto;
7741 case BPF_FUNC_skc_lookup_tcp:
7742 return &bpf_skc_lookup_tcp_proto;
7743 case BPF_FUNC_tcp_sock:
7744 return &bpf_tcp_sock_proto;
7745 case BPF_FUNC_get_listener_sock:
7746 return &bpf_get_listener_sock_proto;
7747 case BPF_FUNC_skb_ecn_set_ce:
7748 return &bpf_skb_ecn_set_ce_proto;
7751 return sk_filter_func_proto(func_id, prog);
7755 static const struct bpf_func_proto *
7756 tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7759 case BPF_FUNC_skb_store_bytes:
7760 return &bpf_skb_store_bytes_proto;
7761 case BPF_FUNC_skb_load_bytes:
7762 return &bpf_skb_load_bytes_proto;
7763 case BPF_FUNC_skb_load_bytes_relative:
7764 return &bpf_skb_load_bytes_relative_proto;
7765 case BPF_FUNC_skb_pull_data:
7766 return &bpf_skb_pull_data_proto;
7767 case BPF_FUNC_csum_diff:
7768 return &bpf_csum_diff_proto;
7769 case BPF_FUNC_csum_update:
7770 return &bpf_csum_update_proto;
7771 case BPF_FUNC_csum_level:
7772 return &bpf_csum_level_proto;
7773 case BPF_FUNC_l3_csum_replace:
7774 return &bpf_l3_csum_replace_proto;
7775 case BPF_FUNC_l4_csum_replace:
7776 return &bpf_l4_csum_replace_proto;
7777 case BPF_FUNC_clone_redirect:
7778 return &bpf_clone_redirect_proto;
7779 case BPF_FUNC_get_cgroup_classid:
7780 return &bpf_get_cgroup_classid_proto;
7781 case BPF_FUNC_skb_vlan_push:
7782 return &bpf_skb_vlan_push_proto;
7783 case BPF_FUNC_skb_vlan_pop:
7784 return &bpf_skb_vlan_pop_proto;
7785 case BPF_FUNC_skb_change_proto:
7786 return &bpf_skb_change_proto_proto;
7787 case BPF_FUNC_skb_change_type:
7788 return &bpf_skb_change_type_proto;
7789 case BPF_FUNC_skb_adjust_room:
7790 return &bpf_skb_adjust_room_proto;
7791 case BPF_FUNC_skb_change_tail:
7792 return &bpf_skb_change_tail_proto;
7793 case BPF_FUNC_skb_change_head:
7794 return &bpf_skb_change_head_proto;
7795 case BPF_FUNC_skb_get_tunnel_key:
7796 return &bpf_skb_get_tunnel_key_proto;
7797 case BPF_FUNC_skb_set_tunnel_key:
7798 return bpf_get_skb_set_tunnel_proto(func_id);
7799 case BPF_FUNC_skb_get_tunnel_opt:
7800 return &bpf_skb_get_tunnel_opt_proto;
7801 case BPF_FUNC_skb_set_tunnel_opt:
7802 return bpf_get_skb_set_tunnel_proto(func_id);
7803 case BPF_FUNC_redirect:
7804 return &bpf_redirect_proto;
7805 case BPF_FUNC_redirect_neigh:
7806 return &bpf_redirect_neigh_proto;
7807 case BPF_FUNC_redirect_peer:
7808 return &bpf_redirect_peer_proto;
7809 case BPF_FUNC_get_route_realm:
7810 return &bpf_get_route_realm_proto;
7811 case BPF_FUNC_get_hash_recalc:
7812 return &bpf_get_hash_recalc_proto;
7813 case BPF_FUNC_set_hash_invalid:
7814 return &bpf_set_hash_invalid_proto;
7815 case BPF_FUNC_set_hash:
7816 return &bpf_set_hash_proto;
7817 case BPF_FUNC_perf_event_output:
7818 return &bpf_skb_event_output_proto;
7819 case BPF_FUNC_get_smp_processor_id:
7820 return &bpf_get_smp_processor_id_proto;
7821 case BPF_FUNC_skb_under_cgroup:
7822 return &bpf_skb_under_cgroup_proto;
7823 case BPF_FUNC_get_socket_cookie:
7824 return &bpf_get_socket_cookie_proto;
7825 case BPF_FUNC_get_socket_uid:
7826 return &bpf_get_socket_uid_proto;
7827 case BPF_FUNC_fib_lookup:
7828 return &bpf_skb_fib_lookup_proto;
7829 case BPF_FUNC_check_mtu:
7830 return &bpf_skb_check_mtu_proto;
7831 case BPF_FUNC_sk_fullsock:
7832 return &bpf_sk_fullsock_proto;
7833 case BPF_FUNC_sk_storage_get:
7834 return &bpf_sk_storage_get_proto;
7835 case BPF_FUNC_sk_storage_delete:
7836 return &bpf_sk_storage_delete_proto;
7838 case BPF_FUNC_skb_get_xfrm_state:
7839 return &bpf_skb_get_xfrm_state_proto;
7841 #ifdef CONFIG_CGROUP_NET_CLASSID
7842 case BPF_FUNC_skb_cgroup_classid:
7843 return &bpf_skb_cgroup_classid_proto;
7845 #ifdef CONFIG_SOCK_CGROUP_DATA
7846 case BPF_FUNC_skb_cgroup_id:
7847 return &bpf_skb_cgroup_id_proto;
7848 case BPF_FUNC_skb_ancestor_cgroup_id:
7849 return &bpf_skb_ancestor_cgroup_id_proto;
7852 case BPF_FUNC_sk_lookup_tcp:
7853 return &bpf_sk_lookup_tcp_proto;
7854 case BPF_FUNC_sk_lookup_udp:
7855 return &bpf_sk_lookup_udp_proto;
7856 case BPF_FUNC_sk_release:
7857 return &bpf_sk_release_proto;
7858 case BPF_FUNC_tcp_sock:
7859 return &bpf_tcp_sock_proto;
7860 case BPF_FUNC_get_listener_sock:
7861 return &bpf_get_listener_sock_proto;
7862 case BPF_FUNC_skc_lookup_tcp:
7863 return &bpf_skc_lookup_tcp_proto;
7864 case BPF_FUNC_tcp_check_syncookie:
7865 return &bpf_tcp_check_syncookie_proto;
7866 case BPF_FUNC_skb_ecn_set_ce:
7867 return &bpf_skb_ecn_set_ce_proto;
7868 case BPF_FUNC_tcp_gen_syncookie:
7869 return &bpf_tcp_gen_syncookie_proto;
7870 case BPF_FUNC_sk_assign:
7871 return &bpf_sk_assign_proto;
7872 case BPF_FUNC_skb_set_tstamp:
7873 return &bpf_skb_set_tstamp_proto;
7874 #ifdef CONFIG_SYN_COOKIES
7875 case BPF_FUNC_tcp_raw_gen_syncookie_ipv4:
7876 return &bpf_tcp_raw_gen_syncookie_ipv4_proto;
7877 case BPF_FUNC_tcp_raw_gen_syncookie_ipv6:
7878 return &bpf_tcp_raw_gen_syncookie_ipv6_proto;
7879 case BPF_FUNC_tcp_raw_check_syncookie_ipv4:
7880 return &bpf_tcp_raw_check_syncookie_ipv4_proto;
7881 case BPF_FUNC_tcp_raw_check_syncookie_ipv6:
7882 return &bpf_tcp_raw_check_syncookie_ipv6_proto;
7886 return bpf_sk_base_func_proto(func_id);
7890 static const struct bpf_func_proto *
7891 xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7894 case BPF_FUNC_perf_event_output:
7895 return &bpf_xdp_event_output_proto;
7896 case BPF_FUNC_get_smp_processor_id:
7897 return &bpf_get_smp_processor_id_proto;
7898 case BPF_FUNC_csum_diff:
7899 return &bpf_csum_diff_proto;
7900 case BPF_FUNC_xdp_adjust_head:
7901 return &bpf_xdp_adjust_head_proto;
7902 case BPF_FUNC_xdp_adjust_meta:
7903 return &bpf_xdp_adjust_meta_proto;
7904 case BPF_FUNC_redirect:
7905 return &bpf_xdp_redirect_proto;
7906 case BPF_FUNC_redirect_map:
7907 return &bpf_xdp_redirect_map_proto;
7908 case BPF_FUNC_xdp_adjust_tail:
7909 return &bpf_xdp_adjust_tail_proto;
7910 case BPF_FUNC_xdp_get_buff_len:
7911 return &bpf_xdp_get_buff_len_proto;
7912 case BPF_FUNC_xdp_load_bytes:
7913 return &bpf_xdp_load_bytes_proto;
7914 case BPF_FUNC_xdp_store_bytes:
7915 return &bpf_xdp_store_bytes_proto;
7916 case BPF_FUNC_fib_lookup:
7917 return &bpf_xdp_fib_lookup_proto;
7918 case BPF_FUNC_check_mtu:
7919 return &bpf_xdp_check_mtu_proto;
7921 case BPF_FUNC_sk_lookup_udp:
7922 return &bpf_xdp_sk_lookup_udp_proto;
7923 case BPF_FUNC_sk_lookup_tcp:
7924 return &bpf_xdp_sk_lookup_tcp_proto;
7925 case BPF_FUNC_sk_release:
7926 return &bpf_sk_release_proto;
7927 case BPF_FUNC_skc_lookup_tcp:
7928 return &bpf_xdp_skc_lookup_tcp_proto;
7929 case BPF_FUNC_tcp_check_syncookie:
7930 return &bpf_tcp_check_syncookie_proto;
7931 case BPF_FUNC_tcp_gen_syncookie:
7932 return &bpf_tcp_gen_syncookie_proto;
7933 #ifdef CONFIG_SYN_COOKIES
7934 case BPF_FUNC_tcp_raw_gen_syncookie_ipv4:
7935 return &bpf_tcp_raw_gen_syncookie_ipv4_proto;
7936 case BPF_FUNC_tcp_raw_gen_syncookie_ipv6:
7937 return &bpf_tcp_raw_gen_syncookie_ipv6_proto;
7938 case BPF_FUNC_tcp_raw_check_syncookie_ipv4:
7939 return &bpf_tcp_raw_check_syncookie_ipv4_proto;
7940 case BPF_FUNC_tcp_raw_check_syncookie_ipv6:
7941 return &bpf_tcp_raw_check_syncookie_ipv6_proto;
7945 return bpf_sk_base_func_proto(func_id);
7949 const struct bpf_func_proto bpf_sock_map_update_proto __weak;
7950 const struct bpf_func_proto bpf_sock_hash_update_proto __weak;
7952 static const struct bpf_func_proto *
7953 sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7955 const struct bpf_func_proto *func_proto;
7957 func_proto = cgroup_common_func_proto(func_id, prog);
7962 case BPF_FUNC_setsockopt:
7963 return &bpf_sock_ops_setsockopt_proto;
7964 case BPF_FUNC_getsockopt:
7965 return &bpf_sock_ops_getsockopt_proto;
7966 case BPF_FUNC_sock_ops_cb_flags_set:
7967 return &bpf_sock_ops_cb_flags_set_proto;
7968 case BPF_FUNC_sock_map_update:
7969 return &bpf_sock_map_update_proto;
7970 case BPF_FUNC_sock_hash_update:
7971 return &bpf_sock_hash_update_proto;
7972 case BPF_FUNC_get_socket_cookie:
7973 return &bpf_get_socket_cookie_sock_ops_proto;
7974 case BPF_FUNC_perf_event_output:
7975 return &bpf_event_output_data_proto;
7976 case BPF_FUNC_sk_storage_get:
7977 return &bpf_sk_storage_get_proto;
7978 case BPF_FUNC_sk_storage_delete:
7979 return &bpf_sk_storage_delete_proto;
7980 case BPF_FUNC_get_netns_cookie:
7981 return &bpf_get_netns_cookie_sock_ops_proto;
7983 case BPF_FUNC_load_hdr_opt:
7984 return &bpf_sock_ops_load_hdr_opt_proto;
7985 case BPF_FUNC_store_hdr_opt:
7986 return &bpf_sock_ops_store_hdr_opt_proto;
7987 case BPF_FUNC_reserve_hdr_opt:
7988 return &bpf_sock_ops_reserve_hdr_opt_proto;
7989 case BPF_FUNC_tcp_sock:
7990 return &bpf_tcp_sock_proto;
7991 #endif /* CONFIG_INET */
7993 return bpf_sk_base_func_proto(func_id);
7997 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak;
7998 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak;
8000 static const struct bpf_func_proto *
8001 sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
8004 case BPF_FUNC_msg_redirect_map:
8005 return &bpf_msg_redirect_map_proto;
8006 case BPF_FUNC_msg_redirect_hash:
8007 return &bpf_msg_redirect_hash_proto;
8008 case BPF_FUNC_msg_apply_bytes:
8009 return &bpf_msg_apply_bytes_proto;
8010 case BPF_FUNC_msg_cork_bytes:
8011 return &bpf_msg_cork_bytes_proto;
8012 case BPF_FUNC_msg_pull_data:
8013 return &bpf_msg_pull_data_proto;
8014 case BPF_FUNC_msg_push_data:
8015 return &bpf_msg_push_data_proto;
8016 case BPF_FUNC_msg_pop_data:
8017 return &bpf_msg_pop_data_proto;
8018 case BPF_FUNC_perf_event_output:
8019 return &bpf_event_output_data_proto;
8020 case BPF_FUNC_get_current_uid_gid:
8021 return &bpf_get_current_uid_gid_proto;
8022 case BPF_FUNC_get_current_pid_tgid:
8023 return &bpf_get_current_pid_tgid_proto;
8024 case BPF_FUNC_sk_storage_get:
8025 return &bpf_sk_storage_get_proto;
8026 case BPF_FUNC_sk_storage_delete:
8027 return &bpf_sk_storage_delete_proto;
8028 case BPF_FUNC_get_netns_cookie:
8029 return &bpf_get_netns_cookie_sk_msg_proto;
8030 #ifdef CONFIG_CGROUPS
8031 case BPF_FUNC_get_current_cgroup_id:
8032 return &bpf_get_current_cgroup_id_proto;
8033 case BPF_FUNC_get_current_ancestor_cgroup_id:
8034 return &bpf_get_current_ancestor_cgroup_id_proto;
8036 #ifdef CONFIG_CGROUP_NET_CLASSID
8037 case BPF_FUNC_get_cgroup_classid:
8038 return &bpf_get_cgroup_classid_curr_proto;
8041 return bpf_sk_base_func_proto(func_id);
8045 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak;
8046 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak;
8048 static const struct bpf_func_proto *
8049 sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
8052 case BPF_FUNC_skb_store_bytes:
8053 return &bpf_skb_store_bytes_proto;
8054 case BPF_FUNC_skb_load_bytes:
8055 return &bpf_skb_load_bytes_proto;
8056 case BPF_FUNC_skb_pull_data:
8057 return &sk_skb_pull_data_proto;
8058 case BPF_FUNC_skb_change_tail:
8059 return &sk_skb_change_tail_proto;
8060 case BPF_FUNC_skb_change_head:
8061 return &sk_skb_change_head_proto;
8062 case BPF_FUNC_skb_adjust_room:
8063 return &sk_skb_adjust_room_proto;
8064 case BPF_FUNC_get_socket_cookie:
8065 return &bpf_get_socket_cookie_proto;
8066 case BPF_FUNC_get_socket_uid:
8067 return &bpf_get_socket_uid_proto;
8068 case BPF_FUNC_sk_redirect_map:
8069 return &bpf_sk_redirect_map_proto;
8070 case BPF_FUNC_sk_redirect_hash:
8071 return &bpf_sk_redirect_hash_proto;
8072 case BPF_FUNC_perf_event_output:
8073 return &bpf_skb_event_output_proto;
8075 case BPF_FUNC_sk_lookup_tcp:
8076 return &bpf_sk_lookup_tcp_proto;
8077 case BPF_FUNC_sk_lookup_udp:
8078 return &bpf_sk_lookup_udp_proto;
8079 case BPF_FUNC_sk_release:
8080 return &bpf_sk_release_proto;
8081 case BPF_FUNC_skc_lookup_tcp:
8082 return &bpf_skc_lookup_tcp_proto;
8085 return bpf_sk_base_func_proto(func_id);
8089 static const struct bpf_func_proto *
8090 flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
8093 case BPF_FUNC_skb_load_bytes:
8094 return &bpf_flow_dissector_load_bytes_proto;
8096 return bpf_sk_base_func_proto(func_id);
8100 static const struct bpf_func_proto *
8101 lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
8104 case BPF_FUNC_skb_load_bytes:
8105 return &bpf_skb_load_bytes_proto;
8106 case BPF_FUNC_skb_pull_data:
8107 return &bpf_skb_pull_data_proto;
8108 case BPF_FUNC_csum_diff:
8109 return &bpf_csum_diff_proto;
8110 case BPF_FUNC_get_cgroup_classid:
8111 return &bpf_get_cgroup_classid_proto;
8112 case BPF_FUNC_get_route_realm:
8113 return &bpf_get_route_realm_proto;
8114 case BPF_FUNC_get_hash_recalc:
8115 return &bpf_get_hash_recalc_proto;
8116 case BPF_FUNC_perf_event_output:
8117 return &bpf_skb_event_output_proto;
8118 case BPF_FUNC_get_smp_processor_id:
8119 return &bpf_get_smp_processor_id_proto;
8120 case BPF_FUNC_skb_under_cgroup:
8121 return &bpf_skb_under_cgroup_proto;
8123 return bpf_sk_base_func_proto(func_id);
8127 static const struct bpf_func_proto *
8128 lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
8131 case BPF_FUNC_lwt_push_encap:
8132 return &bpf_lwt_in_push_encap_proto;
8134 return lwt_out_func_proto(func_id, prog);
8138 static const struct bpf_func_proto *
8139 lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
8142 case BPF_FUNC_skb_get_tunnel_key:
8143 return &bpf_skb_get_tunnel_key_proto;
8144 case BPF_FUNC_skb_set_tunnel_key:
8145 return bpf_get_skb_set_tunnel_proto(func_id);
8146 case BPF_FUNC_skb_get_tunnel_opt:
8147 return &bpf_skb_get_tunnel_opt_proto;
8148 case BPF_FUNC_skb_set_tunnel_opt:
8149 return bpf_get_skb_set_tunnel_proto(func_id);
8150 case BPF_FUNC_redirect:
8151 return &bpf_redirect_proto;
8152 case BPF_FUNC_clone_redirect:
8153 return &bpf_clone_redirect_proto;
8154 case BPF_FUNC_skb_change_tail:
8155 return &bpf_skb_change_tail_proto;
8156 case BPF_FUNC_skb_change_head:
8157 return &bpf_skb_change_head_proto;
8158 case BPF_FUNC_skb_store_bytes:
8159 return &bpf_skb_store_bytes_proto;
8160 case BPF_FUNC_csum_update:
8161 return &bpf_csum_update_proto;
8162 case BPF_FUNC_csum_level:
8163 return &bpf_csum_level_proto;
8164 case BPF_FUNC_l3_csum_replace:
8165 return &bpf_l3_csum_replace_proto;
8166 case BPF_FUNC_l4_csum_replace:
8167 return &bpf_l4_csum_replace_proto;
8168 case BPF_FUNC_set_hash_invalid:
8169 return &bpf_set_hash_invalid_proto;
8170 case BPF_FUNC_lwt_push_encap:
8171 return &bpf_lwt_xmit_push_encap_proto;
8173 return lwt_out_func_proto(func_id, prog);
8177 static const struct bpf_func_proto *
8178 lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
8181 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
8182 case BPF_FUNC_lwt_seg6_store_bytes:
8183 return &bpf_lwt_seg6_store_bytes_proto;
8184 case BPF_FUNC_lwt_seg6_action:
8185 return &bpf_lwt_seg6_action_proto;
8186 case BPF_FUNC_lwt_seg6_adjust_srh:
8187 return &bpf_lwt_seg6_adjust_srh_proto;
8190 return lwt_out_func_proto(func_id, prog);
8194 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type,
8195 const struct bpf_prog *prog,
8196 struct bpf_insn_access_aux *info)
8198 const int size_default = sizeof(__u32);
8200 if (off < 0 || off >= sizeof(struct __sk_buff))
8203 /* The verifier guarantees that size > 0. */
8204 if (off % size != 0)
8208 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
8209 if (off + size > offsetofend(struct __sk_buff, cb[4]))
8212 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]):
8213 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]):
8214 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4):
8215 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4):
8216 case bpf_ctx_range(struct __sk_buff, data):
8217 case bpf_ctx_range(struct __sk_buff, data_meta):
8218 case bpf_ctx_range(struct __sk_buff, data_end):
8219 if (size != size_default)
8222 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys):
8224 case bpf_ctx_range(struct __sk_buff, hwtstamp):
8225 if (type == BPF_WRITE || size != sizeof(__u64))
8228 case bpf_ctx_range(struct __sk_buff, tstamp):
8229 if (size != sizeof(__u64))
8232 case offsetof(struct __sk_buff, sk):
8233 if (type == BPF_WRITE || size != sizeof(__u64))
8235 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL;
8237 case offsetof(struct __sk_buff, tstamp_type):
8239 case offsetofend(struct __sk_buff, tstamp_type) ... offsetof(struct __sk_buff, hwtstamp) - 1:
8240 /* Explicitly prohibit access to padding in __sk_buff. */
8243 /* Only narrow read access allowed for now. */
8244 if (type == BPF_WRITE) {
8245 if (size != size_default)
8248 bpf_ctx_record_field_size(info, size_default);
8249 if (!bpf_ctx_narrow_access_ok(off, size, size_default))
8257 static bool sk_filter_is_valid_access(int off, int size,
8258 enum bpf_access_type type,
8259 const struct bpf_prog *prog,
8260 struct bpf_insn_access_aux *info)
8263 case bpf_ctx_range(struct __sk_buff, tc_classid):
8264 case bpf_ctx_range(struct __sk_buff, data):
8265 case bpf_ctx_range(struct __sk_buff, data_meta):
8266 case bpf_ctx_range(struct __sk_buff, data_end):
8267 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
8268 case bpf_ctx_range(struct __sk_buff, tstamp):
8269 case bpf_ctx_range(struct __sk_buff, wire_len):
8270 case bpf_ctx_range(struct __sk_buff, hwtstamp):
8274 if (type == BPF_WRITE) {
8276 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
8283 return bpf_skb_is_valid_access(off, size, type, prog, info);
8286 static bool cg_skb_is_valid_access(int off, int size,
8287 enum bpf_access_type type,
8288 const struct bpf_prog *prog,
8289 struct bpf_insn_access_aux *info)
8292 case bpf_ctx_range(struct __sk_buff, tc_classid):
8293 case bpf_ctx_range(struct __sk_buff, data_meta):
8294 case bpf_ctx_range(struct __sk_buff, wire_len):
8296 case bpf_ctx_range(struct __sk_buff, data):
8297 case bpf_ctx_range(struct __sk_buff, data_end):
8303 if (type == BPF_WRITE) {
8305 case bpf_ctx_range(struct __sk_buff, mark):
8306 case bpf_ctx_range(struct __sk_buff, priority):
8307 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
8309 case bpf_ctx_range(struct __sk_buff, tstamp):
8319 case bpf_ctx_range(struct __sk_buff, data):
8320 info->reg_type = PTR_TO_PACKET;
8322 case bpf_ctx_range(struct __sk_buff, data_end):
8323 info->reg_type = PTR_TO_PACKET_END;
8327 return bpf_skb_is_valid_access(off, size, type, prog, info);
8330 static bool lwt_is_valid_access(int off, int size,
8331 enum bpf_access_type type,
8332 const struct bpf_prog *prog,
8333 struct bpf_insn_access_aux *info)
8336 case bpf_ctx_range(struct __sk_buff, tc_classid):
8337 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
8338 case bpf_ctx_range(struct __sk_buff, data_meta):
8339 case bpf_ctx_range(struct __sk_buff, tstamp):
8340 case bpf_ctx_range(struct __sk_buff, wire_len):
8341 case bpf_ctx_range(struct __sk_buff, hwtstamp):
8345 if (type == BPF_WRITE) {
8347 case bpf_ctx_range(struct __sk_buff, mark):
8348 case bpf_ctx_range(struct __sk_buff, priority):
8349 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
8357 case bpf_ctx_range(struct __sk_buff, data):
8358 info->reg_type = PTR_TO_PACKET;
8360 case bpf_ctx_range(struct __sk_buff, data_end):
8361 info->reg_type = PTR_TO_PACKET_END;
8365 return bpf_skb_is_valid_access(off, size, type, prog, info);
8368 /* Attach type specific accesses */
8369 static bool __sock_filter_check_attach_type(int off,
8370 enum bpf_access_type access_type,
8371 enum bpf_attach_type attach_type)
8374 case offsetof(struct bpf_sock, bound_dev_if):
8375 case offsetof(struct bpf_sock, mark):
8376 case offsetof(struct bpf_sock, priority):
8377 switch (attach_type) {
8378 case BPF_CGROUP_INET_SOCK_CREATE:
8379 case BPF_CGROUP_INET_SOCK_RELEASE:
8384 case bpf_ctx_range(struct bpf_sock, src_ip4):
8385 switch (attach_type) {
8386 case BPF_CGROUP_INET4_POST_BIND:
8391 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
8392 switch (attach_type) {
8393 case BPF_CGROUP_INET6_POST_BIND:
8398 case bpf_ctx_range(struct bpf_sock, src_port):
8399 switch (attach_type) {
8400 case BPF_CGROUP_INET4_POST_BIND:
8401 case BPF_CGROUP_INET6_POST_BIND:
8408 return access_type == BPF_READ;
8413 bool bpf_sock_common_is_valid_access(int off, int size,
8414 enum bpf_access_type type,
8415 struct bpf_insn_access_aux *info)
8418 case bpf_ctx_range_till(struct bpf_sock, type, priority):
8421 return bpf_sock_is_valid_access(off, size, type, info);
8425 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
8426 struct bpf_insn_access_aux *info)
8428 const int size_default = sizeof(__u32);
8431 if (off < 0 || off >= sizeof(struct bpf_sock))
8433 if (off % size != 0)
8437 case offsetof(struct bpf_sock, state):
8438 case offsetof(struct bpf_sock, family):
8439 case offsetof(struct bpf_sock, type):
8440 case offsetof(struct bpf_sock, protocol):
8441 case offsetof(struct bpf_sock, src_port):
8442 case offsetof(struct bpf_sock, rx_queue_mapping):
8443 case bpf_ctx_range(struct bpf_sock, src_ip4):
8444 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
8445 case bpf_ctx_range(struct bpf_sock, dst_ip4):
8446 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]):
8447 bpf_ctx_record_field_size(info, size_default);
8448 return bpf_ctx_narrow_access_ok(off, size, size_default);
8449 case bpf_ctx_range(struct bpf_sock, dst_port):
8450 field_size = size == size_default ?
8451 size_default : sizeof_field(struct bpf_sock, dst_port);
8452 bpf_ctx_record_field_size(info, field_size);
8453 return bpf_ctx_narrow_access_ok(off, size, field_size);
8454 case offsetofend(struct bpf_sock, dst_port) ...
8455 offsetof(struct bpf_sock, dst_ip4) - 1:
8459 return size == size_default;
8462 static bool sock_filter_is_valid_access(int off, int size,
8463 enum bpf_access_type type,
8464 const struct bpf_prog *prog,
8465 struct bpf_insn_access_aux *info)
8467 if (!bpf_sock_is_valid_access(off, size, type, info))
8469 return __sock_filter_check_attach_type(off, type,
8470 prog->expected_attach_type);
8473 static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write,
8474 const struct bpf_prog *prog)
8476 /* Neither direct read nor direct write requires any preliminary
8482 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write,
8483 const struct bpf_prog *prog, int drop_verdict)
8485 struct bpf_insn *insn = insn_buf;
8490 /* if (!skb->cloned)
8493 * (Fast-path, otherwise approximation that we might be
8494 * a clone, do the rest in helper.)
8496 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET);
8497 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK);
8498 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7);
8500 /* ret = bpf_skb_pull_data(skb, 0); */
8501 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
8502 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2);
8503 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
8504 BPF_FUNC_skb_pull_data);
8507 * return TC_ACT_SHOT;
8509 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2);
8510 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict);
8511 *insn++ = BPF_EXIT_INSN();
8514 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6);
8516 *insn++ = prog->insnsi[0];
8518 return insn - insn_buf;
8521 static int bpf_gen_ld_abs(const struct bpf_insn *orig,
8522 struct bpf_insn *insn_buf)
8524 bool indirect = BPF_MODE(orig->code) == BPF_IND;
8525 struct bpf_insn *insn = insn_buf;
8528 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm);
8530 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg);
8532 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm);
8534 /* We're guaranteed here that CTX is in R6. */
8535 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX);
8537 switch (BPF_SIZE(orig->code)) {
8539 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache);
8542 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache);
8545 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache);
8549 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2);
8550 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0);
8551 *insn++ = BPF_EXIT_INSN();
8553 return insn - insn_buf;
8556 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write,
8557 const struct bpf_prog *prog)
8559 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT);
8562 static bool tc_cls_act_is_valid_access(int off, int size,
8563 enum bpf_access_type type,
8564 const struct bpf_prog *prog,
8565 struct bpf_insn_access_aux *info)
8567 if (type == BPF_WRITE) {
8569 case bpf_ctx_range(struct __sk_buff, mark):
8570 case bpf_ctx_range(struct __sk_buff, tc_index):
8571 case bpf_ctx_range(struct __sk_buff, priority):
8572 case bpf_ctx_range(struct __sk_buff, tc_classid):
8573 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
8574 case bpf_ctx_range(struct __sk_buff, tstamp):
8575 case bpf_ctx_range(struct __sk_buff, queue_mapping):
8583 case bpf_ctx_range(struct __sk_buff, data):
8584 info->reg_type = PTR_TO_PACKET;
8586 case bpf_ctx_range(struct __sk_buff, data_meta):
8587 info->reg_type = PTR_TO_PACKET_META;
8589 case bpf_ctx_range(struct __sk_buff, data_end):
8590 info->reg_type = PTR_TO_PACKET_END;
8592 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
8594 case offsetof(struct __sk_buff, tstamp_type):
8595 /* The convert_ctx_access() on reading and writing
8596 * __sk_buff->tstamp depends on whether the bpf prog
8597 * has used __sk_buff->tstamp_type or not.
8598 * Thus, we need to set prog->tstamp_type_access
8599 * earlier during is_valid_access() here.
8601 ((struct bpf_prog *)prog)->tstamp_type_access = 1;
8602 return size == sizeof(__u8);
8605 return bpf_skb_is_valid_access(off, size, type, prog, info);
8608 static bool __is_valid_xdp_access(int off, int size)
8610 if (off < 0 || off >= sizeof(struct xdp_md))
8612 if (off % size != 0)
8614 if (size != sizeof(__u32))
8620 static bool xdp_is_valid_access(int off, int size,
8621 enum bpf_access_type type,
8622 const struct bpf_prog *prog,
8623 struct bpf_insn_access_aux *info)
8625 if (prog->expected_attach_type != BPF_XDP_DEVMAP) {
8627 case offsetof(struct xdp_md, egress_ifindex):
8632 if (type == BPF_WRITE) {
8633 if (bpf_prog_is_dev_bound(prog->aux)) {
8635 case offsetof(struct xdp_md, rx_queue_index):
8636 return __is_valid_xdp_access(off, size);
8643 case offsetof(struct xdp_md, data):
8644 info->reg_type = PTR_TO_PACKET;
8646 case offsetof(struct xdp_md, data_meta):
8647 info->reg_type = PTR_TO_PACKET_META;
8649 case offsetof(struct xdp_md, data_end):
8650 info->reg_type = PTR_TO_PACKET_END;
8654 return __is_valid_xdp_access(off, size);
8657 void bpf_warn_invalid_xdp_action(struct net_device *dev, struct bpf_prog *prog, u32 act)
8659 const u32 act_max = XDP_REDIRECT;
8661 pr_warn_once("%s XDP return value %u on prog %s (id %d) dev %s, expect packet loss!\n",
8662 act > act_max ? "Illegal" : "Driver unsupported",
8663 act, prog->aux->name, prog->aux->id, dev ? dev->name : "N/A");
8665 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
8667 static bool sock_addr_is_valid_access(int off, int size,
8668 enum bpf_access_type type,
8669 const struct bpf_prog *prog,
8670 struct bpf_insn_access_aux *info)
8672 const int size_default = sizeof(__u32);
8674 if (off < 0 || off >= sizeof(struct bpf_sock_addr))
8676 if (off % size != 0)
8679 /* Disallow access to IPv6 fields from IPv4 contex and vise
8683 case bpf_ctx_range(struct bpf_sock_addr, user_ip4):
8684 switch (prog->expected_attach_type) {
8685 case BPF_CGROUP_INET4_BIND:
8686 case BPF_CGROUP_INET4_CONNECT:
8687 case BPF_CGROUP_INET4_GETPEERNAME:
8688 case BPF_CGROUP_INET4_GETSOCKNAME:
8689 case BPF_CGROUP_UDP4_SENDMSG:
8690 case BPF_CGROUP_UDP4_RECVMSG:
8696 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
8697 switch (prog->expected_attach_type) {
8698 case BPF_CGROUP_INET6_BIND:
8699 case BPF_CGROUP_INET6_CONNECT:
8700 case BPF_CGROUP_INET6_GETPEERNAME:
8701 case BPF_CGROUP_INET6_GETSOCKNAME:
8702 case BPF_CGROUP_UDP6_SENDMSG:
8703 case BPF_CGROUP_UDP6_RECVMSG:
8709 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4):
8710 switch (prog->expected_attach_type) {
8711 case BPF_CGROUP_UDP4_SENDMSG:
8717 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
8719 switch (prog->expected_attach_type) {
8720 case BPF_CGROUP_UDP6_SENDMSG:
8729 case bpf_ctx_range(struct bpf_sock_addr, user_ip4):
8730 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
8731 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4):
8732 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
8734 case bpf_ctx_range(struct bpf_sock_addr, user_port):
8735 if (type == BPF_READ) {
8736 bpf_ctx_record_field_size(info, size_default);
8738 if (bpf_ctx_wide_access_ok(off, size,
8739 struct bpf_sock_addr,
8743 if (bpf_ctx_wide_access_ok(off, size,
8744 struct bpf_sock_addr,
8748 if (!bpf_ctx_narrow_access_ok(off, size, size_default))
8751 if (bpf_ctx_wide_access_ok(off, size,
8752 struct bpf_sock_addr,
8756 if (bpf_ctx_wide_access_ok(off, size,
8757 struct bpf_sock_addr,
8761 if (size != size_default)
8765 case offsetof(struct bpf_sock_addr, sk):
8766 if (type != BPF_READ)
8768 if (size != sizeof(__u64))
8770 info->reg_type = PTR_TO_SOCKET;
8773 if (type == BPF_READ) {
8774 if (size != size_default)
8784 static bool sock_ops_is_valid_access(int off, int size,
8785 enum bpf_access_type type,
8786 const struct bpf_prog *prog,
8787 struct bpf_insn_access_aux *info)
8789 const int size_default = sizeof(__u32);
8791 if (off < 0 || off >= sizeof(struct bpf_sock_ops))
8794 /* The verifier guarantees that size > 0. */
8795 if (off % size != 0)
8798 if (type == BPF_WRITE) {
8800 case offsetof(struct bpf_sock_ops, reply):
8801 case offsetof(struct bpf_sock_ops, sk_txhash):
8802 if (size != size_default)
8810 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received,
8812 if (size != sizeof(__u64))
8815 case offsetof(struct bpf_sock_ops, sk):
8816 if (size != sizeof(__u64))
8818 info->reg_type = PTR_TO_SOCKET_OR_NULL;
8820 case offsetof(struct bpf_sock_ops, skb_data):
8821 if (size != sizeof(__u64))
8823 info->reg_type = PTR_TO_PACKET;
8825 case offsetof(struct bpf_sock_ops, skb_data_end):
8826 if (size != sizeof(__u64))
8828 info->reg_type = PTR_TO_PACKET_END;
8830 case offsetof(struct bpf_sock_ops, skb_tcp_flags):
8831 bpf_ctx_record_field_size(info, size_default);
8832 return bpf_ctx_narrow_access_ok(off, size,
8835 if (size != size_default)
8844 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write,
8845 const struct bpf_prog *prog)
8847 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP);
8850 static bool sk_skb_is_valid_access(int off, int size,
8851 enum bpf_access_type type,
8852 const struct bpf_prog *prog,
8853 struct bpf_insn_access_aux *info)
8856 case bpf_ctx_range(struct __sk_buff, tc_classid):
8857 case bpf_ctx_range(struct __sk_buff, data_meta):
8858 case bpf_ctx_range(struct __sk_buff, tstamp):
8859 case bpf_ctx_range(struct __sk_buff, wire_len):
8860 case bpf_ctx_range(struct __sk_buff, hwtstamp):
8864 if (type == BPF_WRITE) {
8866 case bpf_ctx_range(struct __sk_buff, tc_index):
8867 case bpf_ctx_range(struct __sk_buff, priority):
8875 case bpf_ctx_range(struct __sk_buff, mark):
8877 case bpf_ctx_range(struct __sk_buff, data):
8878 info->reg_type = PTR_TO_PACKET;
8880 case bpf_ctx_range(struct __sk_buff, data_end):
8881 info->reg_type = PTR_TO_PACKET_END;
8885 return bpf_skb_is_valid_access(off, size, type, prog, info);
8888 static bool sk_msg_is_valid_access(int off, int size,
8889 enum bpf_access_type type,
8890 const struct bpf_prog *prog,
8891 struct bpf_insn_access_aux *info)
8893 if (type == BPF_WRITE)
8896 if (off % size != 0)
8900 case offsetof(struct sk_msg_md, data):
8901 info->reg_type = PTR_TO_PACKET;
8902 if (size != sizeof(__u64))
8905 case offsetof(struct sk_msg_md, data_end):
8906 info->reg_type = PTR_TO_PACKET_END;
8907 if (size != sizeof(__u64))
8910 case offsetof(struct sk_msg_md, sk):
8911 if (size != sizeof(__u64))
8913 info->reg_type = PTR_TO_SOCKET;
8915 case bpf_ctx_range(struct sk_msg_md, family):
8916 case bpf_ctx_range(struct sk_msg_md, remote_ip4):
8917 case bpf_ctx_range(struct sk_msg_md, local_ip4):
8918 case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]):
8919 case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]):
8920 case bpf_ctx_range(struct sk_msg_md, remote_port):
8921 case bpf_ctx_range(struct sk_msg_md, local_port):
8922 case bpf_ctx_range(struct sk_msg_md, size):
8923 if (size != sizeof(__u32))
8932 static bool flow_dissector_is_valid_access(int off, int size,
8933 enum bpf_access_type type,
8934 const struct bpf_prog *prog,
8935 struct bpf_insn_access_aux *info)
8937 const int size_default = sizeof(__u32);
8939 if (off < 0 || off >= sizeof(struct __sk_buff))
8942 if (type == BPF_WRITE)
8946 case bpf_ctx_range(struct __sk_buff, data):
8947 if (size != size_default)
8949 info->reg_type = PTR_TO_PACKET;
8951 case bpf_ctx_range(struct __sk_buff, data_end):
8952 if (size != size_default)
8954 info->reg_type = PTR_TO_PACKET_END;
8956 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys):
8957 if (size != sizeof(__u64))
8959 info->reg_type = PTR_TO_FLOW_KEYS;
8966 static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type,
8967 const struct bpf_insn *si,
8968 struct bpf_insn *insn_buf,
8969 struct bpf_prog *prog,
8973 struct bpf_insn *insn = insn_buf;
8976 case offsetof(struct __sk_buff, data):
8977 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data),
8978 si->dst_reg, si->src_reg,
8979 offsetof(struct bpf_flow_dissector, data));
8982 case offsetof(struct __sk_buff, data_end):
8983 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end),
8984 si->dst_reg, si->src_reg,
8985 offsetof(struct bpf_flow_dissector, data_end));
8988 case offsetof(struct __sk_buff, flow_keys):
8989 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys),
8990 si->dst_reg, si->src_reg,
8991 offsetof(struct bpf_flow_dissector, flow_keys));
8995 return insn - insn_buf;
8998 static struct bpf_insn *bpf_convert_tstamp_type_read(const struct bpf_insn *si,
8999 struct bpf_insn *insn)
9001 __u8 value_reg = si->dst_reg;
9002 __u8 skb_reg = si->src_reg;
9003 /* AX is needed because src_reg and dst_reg could be the same */
9004 __u8 tmp_reg = BPF_REG_AX;
9006 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg,
9007 PKT_VLAN_PRESENT_OFFSET);
9008 *insn++ = BPF_JMP32_IMM(BPF_JSET, tmp_reg,
9009 SKB_MONO_DELIVERY_TIME_MASK, 2);
9010 *insn++ = BPF_MOV32_IMM(value_reg, BPF_SKB_TSTAMP_UNSPEC);
9011 *insn++ = BPF_JMP_A(1);
9012 *insn++ = BPF_MOV32_IMM(value_reg, BPF_SKB_TSTAMP_DELIVERY_MONO);
9017 static struct bpf_insn *bpf_convert_shinfo_access(const struct bpf_insn *si,
9018 struct bpf_insn *insn)
9020 /* si->dst_reg = skb_shinfo(SKB); */
9021 #ifdef NET_SKBUFF_DATA_USES_OFFSET
9022 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end),
9023 BPF_REG_AX, si->src_reg,
9024 offsetof(struct sk_buff, end));
9025 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head),
9026 si->dst_reg, si->src_reg,
9027 offsetof(struct sk_buff, head));
9028 *insn++ = BPF_ALU64_REG(BPF_ADD, si->dst_reg, BPF_REG_AX);
9030 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end),
9031 si->dst_reg, si->src_reg,
9032 offsetof(struct sk_buff, end));
9038 static struct bpf_insn *bpf_convert_tstamp_read(const struct bpf_prog *prog,
9039 const struct bpf_insn *si,
9040 struct bpf_insn *insn)
9042 __u8 value_reg = si->dst_reg;
9043 __u8 skb_reg = si->src_reg;
9045 #ifdef CONFIG_NET_CLS_ACT
9046 /* If the tstamp_type is read,
9047 * the bpf prog is aware the tstamp could have delivery time.
9048 * Thus, read skb->tstamp as is if tstamp_type_access is true.
9050 if (!prog->tstamp_type_access) {
9051 /* AX is needed because src_reg and dst_reg could be the same */
9052 __u8 tmp_reg = BPF_REG_AX;
9054 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, PKT_VLAN_PRESENT_OFFSET);
9055 *insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg,
9056 TC_AT_INGRESS_MASK | SKB_MONO_DELIVERY_TIME_MASK);
9057 *insn++ = BPF_JMP32_IMM(BPF_JNE, tmp_reg,
9058 TC_AT_INGRESS_MASK | SKB_MONO_DELIVERY_TIME_MASK, 2);
9059 /* skb->tc_at_ingress && skb->mono_delivery_time,
9060 * read 0 as the (rcv) timestamp.
9062 *insn++ = BPF_MOV64_IMM(value_reg, 0);
9063 *insn++ = BPF_JMP_A(1);
9067 *insn++ = BPF_LDX_MEM(BPF_DW, value_reg, skb_reg,
9068 offsetof(struct sk_buff, tstamp));
9072 static struct bpf_insn *bpf_convert_tstamp_write(const struct bpf_prog *prog,
9073 const struct bpf_insn *si,
9074 struct bpf_insn *insn)
9076 __u8 value_reg = si->src_reg;
9077 __u8 skb_reg = si->dst_reg;
9079 #ifdef CONFIG_NET_CLS_ACT
9080 /* If the tstamp_type is read,
9081 * the bpf prog is aware the tstamp could have delivery time.
9082 * Thus, write skb->tstamp as is if tstamp_type_access is true.
9083 * Otherwise, writing at ingress will have to clear the
9084 * mono_delivery_time bit also.
9086 if (!prog->tstamp_type_access) {
9087 __u8 tmp_reg = BPF_REG_AX;
9089 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, PKT_VLAN_PRESENT_OFFSET);
9090 /* Writing __sk_buff->tstamp as ingress, goto <clear> */
9091 *insn++ = BPF_JMP32_IMM(BPF_JSET, tmp_reg, TC_AT_INGRESS_MASK, 1);
9093 *insn++ = BPF_JMP_A(2);
9094 /* <clear>: mono_delivery_time */
9095 *insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, ~SKB_MONO_DELIVERY_TIME_MASK);
9096 *insn++ = BPF_STX_MEM(BPF_B, skb_reg, tmp_reg, PKT_VLAN_PRESENT_OFFSET);
9100 /* <store>: skb->tstamp = tstamp */
9101 *insn++ = BPF_STX_MEM(BPF_DW, skb_reg, value_reg,
9102 offsetof(struct sk_buff, tstamp));
9106 static u32 bpf_convert_ctx_access(enum bpf_access_type type,
9107 const struct bpf_insn *si,
9108 struct bpf_insn *insn_buf,
9109 struct bpf_prog *prog, u32 *target_size)
9111 struct bpf_insn *insn = insn_buf;
9115 case offsetof(struct __sk_buff, len):
9116 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
9117 bpf_target_off(struct sk_buff, len, 4,
9121 case offsetof(struct __sk_buff, protocol):
9122 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
9123 bpf_target_off(struct sk_buff, protocol, 2,
9127 case offsetof(struct __sk_buff, vlan_proto):
9128 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
9129 bpf_target_off(struct sk_buff, vlan_proto, 2,
9133 case offsetof(struct __sk_buff, priority):
9134 if (type == BPF_WRITE)
9135 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
9136 bpf_target_off(struct sk_buff, priority, 4,
9139 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
9140 bpf_target_off(struct sk_buff, priority, 4,
9144 case offsetof(struct __sk_buff, ingress_ifindex):
9145 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
9146 bpf_target_off(struct sk_buff, skb_iif, 4,
9150 case offsetof(struct __sk_buff, ifindex):
9151 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
9152 si->dst_reg, si->src_reg,
9153 offsetof(struct sk_buff, dev));
9154 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
9155 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9156 bpf_target_off(struct net_device, ifindex, 4,
9160 case offsetof(struct __sk_buff, hash):
9161 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
9162 bpf_target_off(struct sk_buff, hash, 4,
9166 case offsetof(struct __sk_buff, mark):
9167 if (type == BPF_WRITE)
9168 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
9169 bpf_target_off(struct sk_buff, mark, 4,
9172 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
9173 bpf_target_off(struct sk_buff, mark, 4,
9177 case offsetof(struct __sk_buff, pkt_type):
9179 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg,
9181 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX);
9182 #ifdef __BIG_ENDIAN_BITFIELD
9183 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5);
9187 case offsetof(struct __sk_buff, queue_mapping):
9188 if (type == BPF_WRITE) {
9189 *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1);
9190 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg,
9191 bpf_target_off(struct sk_buff,
9195 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
9196 bpf_target_off(struct sk_buff,
9202 case offsetof(struct __sk_buff, vlan_present):
9204 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg,
9205 PKT_VLAN_PRESENT_OFFSET);
9206 if (PKT_VLAN_PRESENT_BIT)
9207 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, PKT_VLAN_PRESENT_BIT);
9208 if (PKT_VLAN_PRESENT_BIT < 7)
9209 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1);
9212 case offsetof(struct __sk_buff, vlan_tci):
9213 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
9214 bpf_target_off(struct sk_buff, vlan_tci, 2,
9218 case offsetof(struct __sk_buff, cb[0]) ...
9219 offsetofend(struct __sk_buff, cb[4]) - 1:
9220 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, data) < 20);
9221 BUILD_BUG_ON((offsetof(struct sk_buff, cb) +
9222 offsetof(struct qdisc_skb_cb, data)) %
9225 prog->cb_access = 1;
9227 off -= offsetof(struct __sk_buff, cb[0]);
9228 off += offsetof(struct sk_buff, cb);
9229 off += offsetof(struct qdisc_skb_cb, data);
9230 if (type == BPF_WRITE)
9231 *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg,
9234 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg,
9238 case offsetof(struct __sk_buff, tc_classid):
9239 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, tc_classid) != 2);
9242 off -= offsetof(struct __sk_buff, tc_classid);
9243 off += offsetof(struct sk_buff, cb);
9244 off += offsetof(struct qdisc_skb_cb, tc_classid);
9246 if (type == BPF_WRITE)
9247 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg,
9250 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg,
9254 case offsetof(struct __sk_buff, data):
9255 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
9256 si->dst_reg, si->src_reg,
9257 offsetof(struct sk_buff, data));
9260 case offsetof(struct __sk_buff, data_meta):
9262 off -= offsetof(struct __sk_buff, data_meta);
9263 off += offsetof(struct sk_buff, cb);
9264 off += offsetof(struct bpf_skb_data_end, data_meta);
9265 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
9269 case offsetof(struct __sk_buff, data_end):
9271 off -= offsetof(struct __sk_buff, data_end);
9272 off += offsetof(struct sk_buff, cb);
9273 off += offsetof(struct bpf_skb_data_end, data_end);
9274 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
9278 case offsetof(struct __sk_buff, tc_index):
9279 #ifdef CONFIG_NET_SCHED
9280 if (type == BPF_WRITE)
9281 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg,
9282 bpf_target_off(struct sk_buff, tc_index, 2,
9285 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
9286 bpf_target_off(struct sk_buff, tc_index, 2,
9290 if (type == BPF_WRITE)
9291 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg);
9293 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
9297 case offsetof(struct __sk_buff, napi_id):
9298 #if defined(CONFIG_NET_RX_BUSY_POLL)
9299 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
9300 bpf_target_off(struct sk_buff, napi_id, 4,
9302 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1);
9303 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
9306 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
9309 case offsetof(struct __sk_buff, family):
9310 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2);
9312 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
9313 si->dst_reg, si->src_reg,
9314 offsetof(struct sk_buff, sk));
9315 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9316 bpf_target_off(struct sock_common,
9320 case offsetof(struct __sk_buff, remote_ip4):
9321 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4);
9323 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
9324 si->dst_reg, si->src_reg,
9325 offsetof(struct sk_buff, sk));
9326 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9327 bpf_target_off(struct sock_common,
9331 case offsetof(struct __sk_buff, local_ip4):
9332 BUILD_BUG_ON(sizeof_field(struct sock_common,
9333 skc_rcv_saddr) != 4);
9335 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
9336 si->dst_reg, si->src_reg,
9337 offsetof(struct sk_buff, sk));
9338 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9339 bpf_target_off(struct sock_common,
9343 case offsetof(struct __sk_buff, remote_ip6[0]) ...
9344 offsetof(struct __sk_buff, remote_ip6[3]):
9345 #if IS_ENABLED(CONFIG_IPV6)
9346 BUILD_BUG_ON(sizeof_field(struct sock_common,
9347 skc_v6_daddr.s6_addr32[0]) != 4);
9350 off -= offsetof(struct __sk_buff, remote_ip6[0]);
9352 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
9353 si->dst_reg, si->src_reg,
9354 offsetof(struct sk_buff, sk));
9355 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9356 offsetof(struct sock_common,
9357 skc_v6_daddr.s6_addr32[0]) +
9360 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
9363 case offsetof(struct __sk_buff, local_ip6[0]) ...
9364 offsetof(struct __sk_buff, local_ip6[3]):
9365 #if IS_ENABLED(CONFIG_IPV6)
9366 BUILD_BUG_ON(sizeof_field(struct sock_common,
9367 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
9370 off -= offsetof(struct __sk_buff, local_ip6[0]);
9372 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
9373 si->dst_reg, si->src_reg,
9374 offsetof(struct sk_buff, sk));
9375 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9376 offsetof(struct sock_common,
9377 skc_v6_rcv_saddr.s6_addr32[0]) +
9380 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
9384 case offsetof(struct __sk_buff, remote_port):
9385 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2);
9387 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
9388 si->dst_reg, si->src_reg,
9389 offsetof(struct sk_buff, sk));
9390 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9391 bpf_target_off(struct sock_common,
9394 #ifndef __BIG_ENDIAN_BITFIELD
9395 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
9399 case offsetof(struct __sk_buff, local_port):
9400 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2);
9402 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
9403 si->dst_reg, si->src_reg,
9404 offsetof(struct sk_buff, sk));
9405 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9406 bpf_target_off(struct sock_common,
9407 skc_num, 2, target_size));
9410 case offsetof(struct __sk_buff, tstamp):
9411 BUILD_BUG_ON(sizeof_field(struct sk_buff, tstamp) != 8);
9413 if (type == BPF_WRITE)
9414 insn = bpf_convert_tstamp_write(prog, si, insn);
9416 insn = bpf_convert_tstamp_read(prog, si, insn);
9419 case offsetof(struct __sk_buff, tstamp_type):
9420 insn = bpf_convert_tstamp_type_read(si, insn);
9423 case offsetof(struct __sk_buff, gso_segs):
9424 insn = bpf_convert_shinfo_access(si, insn);
9425 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs),
9426 si->dst_reg, si->dst_reg,
9427 bpf_target_off(struct skb_shared_info,
9431 case offsetof(struct __sk_buff, gso_size):
9432 insn = bpf_convert_shinfo_access(si, insn);
9433 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_size),
9434 si->dst_reg, si->dst_reg,
9435 bpf_target_off(struct skb_shared_info,
9439 case offsetof(struct __sk_buff, wire_len):
9440 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, pkt_len) != 4);
9443 off -= offsetof(struct __sk_buff, wire_len);
9444 off += offsetof(struct sk_buff, cb);
9445 off += offsetof(struct qdisc_skb_cb, pkt_len);
9447 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off);
9450 case offsetof(struct __sk_buff, sk):
9451 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
9452 si->dst_reg, si->src_reg,
9453 offsetof(struct sk_buff, sk));
9455 case offsetof(struct __sk_buff, hwtstamp):
9456 BUILD_BUG_ON(sizeof_field(struct skb_shared_hwtstamps, hwtstamp) != 8);
9457 BUILD_BUG_ON(offsetof(struct skb_shared_hwtstamps, hwtstamp) != 0);
9459 insn = bpf_convert_shinfo_access(si, insn);
9460 *insn++ = BPF_LDX_MEM(BPF_DW,
9461 si->dst_reg, si->dst_reg,
9462 bpf_target_off(struct skb_shared_info,
9468 return insn - insn_buf;
9471 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
9472 const struct bpf_insn *si,
9473 struct bpf_insn *insn_buf,
9474 struct bpf_prog *prog, u32 *target_size)
9476 struct bpf_insn *insn = insn_buf;
9480 case offsetof(struct bpf_sock, bound_dev_if):
9481 BUILD_BUG_ON(sizeof_field(struct sock, sk_bound_dev_if) != 4);
9483 if (type == BPF_WRITE)
9484 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
9485 offsetof(struct sock, sk_bound_dev_if));
9487 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
9488 offsetof(struct sock, sk_bound_dev_if));
9491 case offsetof(struct bpf_sock, mark):
9492 BUILD_BUG_ON(sizeof_field(struct sock, sk_mark) != 4);
9494 if (type == BPF_WRITE)
9495 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
9496 offsetof(struct sock, sk_mark));
9498 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
9499 offsetof(struct sock, sk_mark));
9502 case offsetof(struct bpf_sock, priority):
9503 BUILD_BUG_ON(sizeof_field(struct sock, sk_priority) != 4);
9505 if (type == BPF_WRITE)
9506 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
9507 offsetof(struct sock, sk_priority));
9509 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
9510 offsetof(struct sock, sk_priority));
9513 case offsetof(struct bpf_sock, family):
9514 *insn++ = BPF_LDX_MEM(
9515 BPF_FIELD_SIZEOF(struct sock_common, skc_family),
9516 si->dst_reg, si->src_reg,
9517 bpf_target_off(struct sock_common,
9519 sizeof_field(struct sock_common,
9524 case offsetof(struct bpf_sock, type):
9525 *insn++ = BPF_LDX_MEM(
9526 BPF_FIELD_SIZEOF(struct sock, sk_type),
9527 si->dst_reg, si->src_reg,
9528 bpf_target_off(struct sock, sk_type,
9529 sizeof_field(struct sock, sk_type),
9533 case offsetof(struct bpf_sock, protocol):
9534 *insn++ = BPF_LDX_MEM(
9535 BPF_FIELD_SIZEOF(struct sock, sk_protocol),
9536 si->dst_reg, si->src_reg,
9537 bpf_target_off(struct sock, sk_protocol,
9538 sizeof_field(struct sock, sk_protocol),
9542 case offsetof(struct bpf_sock, src_ip4):
9543 *insn++ = BPF_LDX_MEM(
9544 BPF_SIZE(si->code), si->dst_reg, si->src_reg,
9545 bpf_target_off(struct sock_common, skc_rcv_saddr,
9546 sizeof_field(struct sock_common,
9551 case offsetof(struct bpf_sock, dst_ip4):
9552 *insn++ = BPF_LDX_MEM(
9553 BPF_SIZE(si->code), si->dst_reg, si->src_reg,
9554 bpf_target_off(struct sock_common, skc_daddr,
9555 sizeof_field(struct sock_common,
9560 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
9561 #if IS_ENABLED(CONFIG_IPV6)
9563 off -= offsetof(struct bpf_sock, src_ip6[0]);
9564 *insn++ = BPF_LDX_MEM(
9565 BPF_SIZE(si->code), si->dst_reg, si->src_reg,
9568 skc_v6_rcv_saddr.s6_addr32[0],
9569 sizeof_field(struct sock_common,
9570 skc_v6_rcv_saddr.s6_addr32[0]),
9571 target_size) + off);
9574 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
9578 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]):
9579 #if IS_ENABLED(CONFIG_IPV6)
9581 off -= offsetof(struct bpf_sock, dst_ip6[0]);
9582 *insn++ = BPF_LDX_MEM(
9583 BPF_SIZE(si->code), si->dst_reg, si->src_reg,
9584 bpf_target_off(struct sock_common,
9585 skc_v6_daddr.s6_addr32[0],
9586 sizeof_field(struct sock_common,
9587 skc_v6_daddr.s6_addr32[0]),
9588 target_size) + off);
9590 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
9595 case offsetof(struct bpf_sock, src_port):
9596 *insn++ = BPF_LDX_MEM(
9597 BPF_FIELD_SIZEOF(struct sock_common, skc_num),
9598 si->dst_reg, si->src_reg,
9599 bpf_target_off(struct sock_common, skc_num,
9600 sizeof_field(struct sock_common,
9605 case offsetof(struct bpf_sock, dst_port):
9606 *insn++ = BPF_LDX_MEM(
9607 BPF_FIELD_SIZEOF(struct sock_common, skc_dport),
9608 si->dst_reg, si->src_reg,
9609 bpf_target_off(struct sock_common, skc_dport,
9610 sizeof_field(struct sock_common,
9615 case offsetof(struct bpf_sock, state):
9616 *insn++ = BPF_LDX_MEM(
9617 BPF_FIELD_SIZEOF(struct sock_common, skc_state),
9618 si->dst_reg, si->src_reg,
9619 bpf_target_off(struct sock_common, skc_state,
9620 sizeof_field(struct sock_common,
9624 case offsetof(struct bpf_sock, rx_queue_mapping):
9625 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING
9626 *insn++ = BPF_LDX_MEM(
9627 BPF_FIELD_SIZEOF(struct sock, sk_rx_queue_mapping),
9628 si->dst_reg, si->src_reg,
9629 bpf_target_off(struct sock, sk_rx_queue_mapping,
9630 sizeof_field(struct sock,
9631 sk_rx_queue_mapping),
9633 *insn++ = BPF_JMP_IMM(BPF_JNE, si->dst_reg, NO_QUEUE_MAPPING,
9635 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1);
9637 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1);
9643 return insn - insn_buf;
9646 static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type,
9647 const struct bpf_insn *si,
9648 struct bpf_insn *insn_buf,
9649 struct bpf_prog *prog, u32 *target_size)
9651 struct bpf_insn *insn = insn_buf;
9654 case offsetof(struct __sk_buff, ifindex):
9655 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
9656 si->dst_reg, si->src_reg,
9657 offsetof(struct sk_buff, dev));
9658 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9659 bpf_target_off(struct net_device, ifindex, 4,
9663 return bpf_convert_ctx_access(type, si, insn_buf, prog,
9667 return insn - insn_buf;
9670 static u32 xdp_convert_ctx_access(enum bpf_access_type type,
9671 const struct bpf_insn *si,
9672 struct bpf_insn *insn_buf,
9673 struct bpf_prog *prog, u32 *target_size)
9675 struct bpf_insn *insn = insn_buf;
9678 case offsetof(struct xdp_md, data):
9679 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data),
9680 si->dst_reg, si->src_reg,
9681 offsetof(struct xdp_buff, data));
9683 case offsetof(struct xdp_md, data_meta):
9684 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta),
9685 si->dst_reg, si->src_reg,
9686 offsetof(struct xdp_buff, data_meta));
9688 case offsetof(struct xdp_md, data_end):
9689 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end),
9690 si->dst_reg, si->src_reg,
9691 offsetof(struct xdp_buff, data_end));
9693 case offsetof(struct xdp_md, ingress_ifindex):
9694 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
9695 si->dst_reg, si->src_reg,
9696 offsetof(struct xdp_buff, rxq));
9697 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev),
9698 si->dst_reg, si->dst_reg,
9699 offsetof(struct xdp_rxq_info, dev));
9700 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9701 offsetof(struct net_device, ifindex));
9703 case offsetof(struct xdp_md, rx_queue_index):
9704 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
9705 si->dst_reg, si->src_reg,
9706 offsetof(struct xdp_buff, rxq));
9707 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9708 offsetof(struct xdp_rxq_info,
9711 case offsetof(struct xdp_md, egress_ifindex):
9712 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, txq),
9713 si->dst_reg, si->src_reg,
9714 offsetof(struct xdp_buff, txq));
9715 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_txq_info, dev),
9716 si->dst_reg, si->dst_reg,
9717 offsetof(struct xdp_txq_info, dev));
9718 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9719 offsetof(struct net_device, ifindex));
9723 return insn - insn_buf;
9726 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of
9727 * context Structure, F is Field in context structure that contains a pointer
9728 * to Nested Structure of type NS that has the field NF.
9730 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make
9731 * sure that SIZE is not greater than actual size of S.F.NF.
9733 * If offset OFF is provided, the load happens from that offset relative to
9736 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \
9738 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \
9739 si->src_reg, offsetof(S, F)); \
9740 *insn++ = BPF_LDX_MEM( \
9741 SIZE, si->dst_reg, si->dst_reg, \
9742 bpf_target_off(NS, NF, sizeof_field(NS, NF), \
9747 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \
9748 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \
9749 BPF_FIELD_SIZEOF(NS, NF), 0)
9751 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to
9752 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation.
9754 * In addition it uses Temporary Field TF (member of struct S) as the 3rd
9755 * "register" since two registers available in convert_ctx_access are not
9756 * enough: we can't override neither SRC, since it contains value to store, nor
9757 * DST since it contains pointer to context that may be used by later
9758 * instructions. But we need a temporary place to save pointer to nested
9759 * structure whose field we want to store to.
9761 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF) \
9763 int tmp_reg = BPF_REG_9; \
9764 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \
9766 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \
9768 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \
9770 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \
9771 si->dst_reg, offsetof(S, F)); \
9772 *insn++ = BPF_STX_MEM(SIZE, tmp_reg, si->src_reg, \
9773 bpf_target_off(NS, NF, sizeof_field(NS, NF), \
9776 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \
9780 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \
9783 if (type == BPF_WRITE) { \
9784 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, \
9787 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \
9788 S, NS, F, NF, SIZE, OFF); \
9792 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \
9793 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \
9794 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF)
9796 static u32 sock_addr_convert_ctx_access(enum bpf_access_type type,
9797 const struct bpf_insn *si,
9798 struct bpf_insn *insn_buf,
9799 struct bpf_prog *prog, u32 *target_size)
9801 int off, port_size = sizeof_field(struct sockaddr_in6, sin6_port);
9802 struct bpf_insn *insn = insn_buf;
9805 case offsetof(struct bpf_sock_addr, user_family):
9806 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
9807 struct sockaddr, uaddr, sa_family);
9810 case offsetof(struct bpf_sock_addr, user_ip4):
9811 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
9812 struct bpf_sock_addr_kern, struct sockaddr_in, uaddr,
9813 sin_addr, BPF_SIZE(si->code), 0, tmp_reg);
9816 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
9818 off -= offsetof(struct bpf_sock_addr, user_ip6[0]);
9819 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
9820 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr,
9821 sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off,
9825 case offsetof(struct bpf_sock_addr, user_port):
9826 /* To get port we need to know sa_family first and then treat
9827 * sockaddr as either sockaddr_in or sockaddr_in6.
9828 * Though we can simplify since port field has same offset and
9829 * size in both structures.
9830 * Here we check this invariant and use just one of the
9831 * structures if it's true.
9833 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) !=
9834 offsetof(struct sockaddr_in6, sin6_port));
9835 BUILD_BUG_ON(sizeof_field(struct sockaddr_in, sin_port) !=
9836 sizeof_field(struct sockaddr_in6, sin6_port));
9837 /* Account for sin6_port being smaller than user_port. */
9838 port_size = min(port_size, BPF_LDST_BYTES(si));
9839 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
9840 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr,
9841 sin6_port, bytes_to_bpf_size(port_size), 0, tmp_reg);
9844 case offsetof(struct bpf_sock_addr, family):
9845 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
9846 struct sock, sk, sk_family);
9849 case offsetof(struct bpf_sock_addr, type):
9850 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
9851 struct sock, sk, sk_type);
9854 case offsetof(struct bpf_sock_addr, protocol):
9855 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
9856 struct sock, sk, sk_protocol);
9859 case offsetof(struct bpf_sock_addr, msg_src_ip4):
9860 /* Treat t_ctx as struct in_addr for msg_src_ip4. */
9861 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
9862 struct bpf_sock_addr_kern, struct in_addr, t_ctx,
9863 s_addr, BPF_SIZE(si->code), 0, tmp_reg);
9866 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
9869 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]);
9870 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */
9871 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
9872 struct bpf_sock_addr_kern, struct in6_addr, t_ctx,
9873 s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg);
9875 case offsetof(struct bpf_sock_addr, sk):
9876 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk),
9877 si->dst_reg, si->src_reg,
9878 offsetof(struct bpf_sock_addr_kern, sk));
9882 return insn - insn_buf;
9885 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
9886 const struct bpf_insn *si,
9887 struct bpf_insn *insn_buf,
9888 struct bpf_prog *prog,
9891 struct bpf_insn *insn = insn_buf;
9894 /* Helper macro for adding read access to tcp_sock or sock fields. */
9895 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
9897 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 2; \
9898 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \
9899 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \
9900 if (si->dst_reg == reg || si->src_reg == reg) \
9902 if (si->dst_reg == reg || si->src_reg == reg) \
9904 if (si->dst_reg == si->src_reg) { \
9905 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \
9906 offsetof(struct bpf_sock_ops_kern, \
9908 fullsock_reg = reg; \
9911 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
9912 struct bpf_sock_ops_kern, \
9914 fullsock_reg, si->src_reg, \
9915 offsetof(struct bpf_sock_ops_kern, \
9917 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \
9918 if (si->dst_reg == si->src_reg) \
9919 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \
9920 offsetof(struct bpf_sock_ops_kern, \
9922 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
9923 struct bpf_sock_ops_kern, sk),\
9924 si->dst_reg, si->src_reg, \
9925 offsetof(struct bpf_sock_ops_kern, sk));\
9926 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \
9928 si->dst_reg, si->dst_reg, \
9929 offsetof(OBJ, OBJ_FIELD)); \
9930 if (si->dst_reg == si->src_reg) { \
9931 *insn++ = BPF_JMP_A(1); \
9932 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \
9933 offsetof(struct bpf_sock_ops_kern, \
9938 #define SOCK_OPS_GET_SK() \
9940 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 1; \
9941 if (si->dst_reg == reg || si->src_reg == reg) \
9943 if (si->dst_reg == reg || si->src_reg == reg) \
9945 if (si->dst_reg == si->src_reg) { \
9946 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \
9947 offsetof(struct bpf_sock_ops_kern, \
9949 fullsock_reg = reg; \
9952 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
9953 struct bpf_sock_ops_kern, \
9955 fullsock_reg, si->src_reg, \
9956 offsetof(struct bpf_sock_ops_kern, \
9958 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \
9959 if (si->dst_reg == si->src_reg) \
9960 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \
9961 offsetof(struct bpf_sock_ops_kern, \
9963 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
9964 struct bpf_sock_ops_kern, sk),\
9965 si->dst_reg, si->src_reg, \
9966 offsetof(struct bpf_sock_ops_kern, sk));\
9967 if (si->dst_reg == si->src_reg) { \
9968 *insn++ = BPF_JMP_A(1); \
9969 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \
9970 offsetof(struct bpf_sock_ops_kern, \
9975 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \
9976 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock)
9978 /* Helper macro for adding write access to tcp_sock or sock fields.
9979 * The macro is called with two registers, dst_reg which contains a pointer
9980 * to ctx (context) and src_reg which contains the value that should be
9981 * stored. However, we need an additional register since we cannot overwrite
9982 * dst_reg because it may be used later in the program.
9983 * Instead we "borrow" one of the other register. We first save its value
9984 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore
9985 * it at the end of the macro.
9987 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
9989 int reg = BPF_REG_9; \
9990 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \
9991 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \
9992 if (si->dst_reg == reg || si->src_reg == reg) \
9994 if (si->dst_reg == reg || si->src_reg == reg) \
9996 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \
9997 offsetof(struct bpf_sock_ops_kern, \
9999 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
10000 struct bpf_sock_ops_kern, \
10002 reg, si->dst_reg, \
10003 offsetof(struct bpf_sock_ops_kern, \
10005 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \
10006 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
10007 struct bpf_sock_ops_kern, sk),\
10008 reg, si->dst_reg, \
10009 offsetof(struct bpf_sock_ops_kern, sk));\
10010 *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \
10011 reg, si->src_reg, \
10012 offsetof(OBJ, OBJ_FIELD)); \
10013 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \
10014 offsetof(struct bpf_sock_ops_kern, \
10018 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \
10020 if (TYPE == BPF_WRITE) \
10021 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
10023 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
10026 if (insn > insn_buf)
10027 return insn - insn_buf;
10030 case offsetof(struct bpf_sock_ops, op):
10031 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
10033 si->dst_reg, si->src_reg,
10034 offsetof(struct bpf_sock_ops_kern, op));
10037 case offsetof(struct bpf_sock_ops, replylong[0]) ...
10038 offsetof(struct bpf_sock_ops, replylong[3]):
10039 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, reply) !=
10040 sizeof_field(struct bpf_sock_ops_kern, reply));
10041 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, replylong) !=
10042 sizeof_field(struct bpf_sock_ops_kern, replylong));
10044 off -= offsetof(struct bpf_sock_ops, replylong[0]);
10045 off += offsetof(struct bpf_sock_ops_kern, replylong[0]);
10046 if (type == BPF_WRITE)
10047 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
10050 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
10054 case offsetof(struct bpf_sock_ops, family):
10055 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2);
10057 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10058 struct bpf_sock_ops_kern, sk),
10059 si->dst_reg, si->src_reg,
10060 offsetof(struct bpf_sock_ops_kern, sk));
10061 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
10062 offsetof(struct sock_common, skc_family));
10065 case offsetof(struct bpf_sock_ops, remote_ip4):
10066 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4);
10068 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10069 struct bpf_sock_ops_kern, sk),
10070 si->dst_reg, si->src_reg,
10071 offsetof(struct bpf_sock_ops_kern, sk));
10072 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
10073 offsetof(struct sock_common, skc_daddr));
10076 case offsetof(struct bpf_sock_ops, local_ip4):
10077 BUILD_BUG_ON(sizeof_field(struct sock_common,
10078 skc_rcv_saddr) != 4);
10080 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10081 struct bpf_sock_ops_kern, sk),
10082 si->dst_reg, si->src_reg,
10083 offsetof(struct bpf_sock_ops_kern, sk));
10084 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
10085 offsetof(struct sock_common,
10089 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ...
10090 offsetof(struct bpf_sock_ops, remote_ip6[3]):
10091 #if IS_ENABLED(CONFIG_IPV6)
10092 BUILD_BUG_ON(sizeof_field(struct sock_common,
10093 skc_v6_daddr.s6_addr32[0]) != 4);
10096 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]);
10097 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10098 struct bpf_sock_ops_kern, sk),
10099 si->dst_reg, si->src_reg,
10100 offsetof(struct bpf_sock_ops_kern, sk));
10101 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
10102 offsetof(struct sock_common,
10103 skc_v6_daddr.s6_addr32[0]) +
10106 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
10110 case offsetof(struct bpf_sock_ops, local_ip6[0]) ...
10111 offsetof(struct bpf_sock_ops, local_ip6[3]):
10112 #if IS_ENABLED(CONFIG_IPV6)
10113 BUILD_BUG_ON(sizeof_field(struct sock_common,
10114 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
10117 off -= offsetof(struct bpf_sock_ops, local_ip6[0]);
10118 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10119 struct bpf_sock_ops_kern, sk),
10120 si->dst_reg, si->src_reg,
10121 offsetof(struct bpf_sock_ops_kern, sk));
10122 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
10123 offsetof(struct sock_common,
10124 skc_v6_rcv_saddr.s6_addr32[0]) +
10127 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
10131 case offsetof(struct bpf_sock_ops, remote_port):
10132 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2);
10134 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10135 struct bpf_sock_ops_kern, sk),
10136 si->dst_reg, si->src_reg,
10137 offsetof(struct bpf_sock_ops_kern, sk));
10138 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
10139 offsetof(struct sock_common, skc_dport));
10140 #ifndef __BIG_ENDIAN_BITFIELD
10141 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
10145 case offsetof(struct bpf_sock_ops, local_port):
10146 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2);
10148 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10149 struct bpf_sock_ops_kern, sk),
10150 si->dst_reg, si->src_reg,
10151 offsetof(struct bpf_sock_ops_kern, sk));
10152 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
10153 offsetof(struct sock_common, skc_num));
10156 case offsetof(struct bpf_sock_ops, is_fullsock):
10157 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10158 struct bpf_sock_ops_kern,
10160 si->dst_reg, si->src_reg,
10161 offsetof(struct bpf_sock_ops_kern,
10165 case offsetof(struct bpf_sock_ops, state):
10166 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_state) != 1);
10168 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10169 struct bpf_sock_ops_kern, sk),
10170 si->dst_reg, si->src_reg,
10171 offsetof(struct bpf_sock_ops_kern, sk));
10172 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg,
10173 offsetof(struct sock_common, skc_state));
10176 case offsetof(struct bpf_sock_ops, rtt_min):
10177 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) !=
10178 sizeof(struct minmax));
10179 BUILD_BUG_ON(sizeof(struct minmax) <
10180 sizeof(struct minmax_sample));
10182 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10183 struct bpf_sock_ops_kern, sk),
10184 si->dst_reg, si->src_reg,
10185 offsetof(struct bpf_sock_ops_kern, sk));
10186 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
10187 offsetof(struct tcp_sock, rtt_min) +
10188 sizeof_field(struct minmax_sample, t));
10191 case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags):
10192 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags,
10196 case offsetof(struct bpf_sock_ops, sk_txhash):
10197 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash,
10198 struct sock, type);
10200 case offsetof(struct bpf_sock_ops, snd_cwnd):
10201 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd);
10203 case offsetof(struct bpf_sock_ops, srtt_us):
10204 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us);
10206 case offsetof(struct bpf_sock_ops, snd_ssthresh):
10207 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh);
10209 case offsetof(struct bpf_sock_ops, rcv_nxt):
10210 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt);
10212 case offsetof(struct bpf_sock_ops, snd_nxt):
10213 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt);
10215 case offsetof(struct bpf_sock_ops, snd_una):
10216 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una);
10218 case offsetof(struct bpf_sock_ops, mss_cache):
10219 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache);
10221 case offsetof(struct bpf_sock_ops, ecn_flags):
10222 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags);
10224 case offsetof(struct bpf_sock_ops, rate_delivered):
10225 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered);
10227 case offsetof(struct bpf_sock_ops, rate_interval_us):
10228 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us);
10230 case offsetof(struct bpf_sock_ops, packets_out):
10231 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out);
10233 case offsetof(struct bpf_sock_ops, retrans_out):
10234 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out);
10236 case offsetof(struct bpf_sock_ops, total_retrans):
10237 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans);
10239 case offsetof(struct bpf_sock_ops, segs_in):
10240 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in);
10242 case offsetof(struct bpf_sock_ops, data_segs_in):
10243 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in);
10245 case offsetof(struct bpf_sock_ops, segs_out):
10246 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out);
10248 case offsetof(struct bpf_sock_ops, data_segs_out):
10249 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out);
10251 case offsetof(struct bpf_sock_ops, lost_out):
10252 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out);
10254 case offsetof(struct bpf_sock_ops, sacked_out):
10255 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out);
10257 case offsetof(struct bpf_sock_ops, bytes_received):
10258 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received);
10260 case offsetof(struct bpf_sock_ops, bytes_acked):
10261 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked);
10263 case offsetof(struct bpf_sock_ops, sk):
10266 case offsetof(struct bpf_sock_ops, skb_data_end):
10267 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
10269 si->dst_reg, si->src_reg,
10270 offsetof(struct bpf_sock_ops_kern,
10273 case offsetof(struct bpf_sock_ops, skb_data):
10274 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
10276 si->dst_reg, si->src_reg,
10277 offsetof(struct bpf_sock_ops_kern,
10279 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
10280 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
10281 si->dst_reg, si->dst_reg,
10282 offsetof(struct sk_buff, data));
10284 case offsetof(struct bpf_sock_ops, skb_len):
10285 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
10287 si->dst_reg, si->src_reg,
10288 offsetof(struct bpf_sock_ops_kern,
10290 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
10291 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len),
10292 si->dst_reg, si->dst_reg,
10293 offsetof(struct sk_buff, len));
10295 case offsetof(struct bpf_sock_ops, skb_tcp_flags):
10296 off = offsetof(struct sk_buff, cb);
10297 off += offsetof(struct tcp_skb_cb, tcp_flags);
10298 *target_size = sizeof_field(struct tcp_skb_cb, tcp_flags);
10299 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
10301 si->dst_reg, si->src_reg,
10302 offsetof(struct bpf_sock_ops_kern,
10304 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
10305 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_skb_cb,
10307 si->dst_reg, si->dst_reg, off);
10310 return insn - insn_buf;
10313 /* data_end = skb->data + skb_headlen() */
10314 static struct bpf_insn *bpf_convert_data_end_access(const struct bpf_insn *si,
10315 struct bpf_insn *insn)
10318 int temp_reg_off = offsetof(struct sk_buff, cb) +
10319 offsetof(struct sk_skb_cb, temp_reg);
10321 if (si->src_reg == si->dst_reg) {
10322 /* We need an extra register, choose and save a register. */
10324 if (si->src_reg == reg || si->dst_reg == reg)
10326 if (si->src_reg == reg || si->dst_reg == reg)
10328 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, temp_reg_off);
10333 /* reg = skb->data */
10334 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
10336 offsetof(struct sk_buff, data));
10337 /* AX = skb->len */
10338 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len),
10339 BPF_REG_AX, si->src_reg,
10340 offsetof(struct sk_buff, len));
10341 /* reg = skb->data + skb->len */
10342 *insn++ = BPF_ALU64_REG(BPF_ADD, reg, BPF_REG_AX);
10343 /* AX = skb->data_len */
10344 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data_len),
10345 BPF_REG_AX, si->src_reg,
10346 offsetof(struct sk_buff, data_len));
10348 /* reg = skb->data + skb->len - skb->data_len */
10349 *insn++ = BPF_ALU64_REG(BPF_SUB, reg, BPF_REG_AX);
10351 if (si->src_reg == si->dst_reg) {
10352 /* Restore the saved register */
10353 *insn++ = BPF_MOV64_REG(BPF_REG_AX, si->src_reg);
10354 *insn++ = BPF_MOV64_REG(si->dst_reg, reg);
10355 *insn++ = BPF_LDX_MEM(BPF_DW, reg, BPF_REG_AX, temp_reg_off);
10361 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type,
10362 const struct bpf_insn *si,
10363 struct bpf_insn *insn_buf,
10364 struct bpf_prog *prog, u32 *target_size)
10366 struct bpf_insn *insn = insn_buf;
10370 case offsetof(struct __sk_buff, data_end):
10371 insn = bpf_convert_data_end_access(si, insn);
10373 case offsetof(struct __sk_buff, cb[0]) ...
10374 offsetofend(struct __sk_buff, cb[4]) - 1:
10375 BUILD_BUG_ON(sizeof_field(struct sk_skb_cb, data) < 20);
10376 BUILD_BUG_ON((offsetof(struct sk_buff, cb) +
10377 offsetof(struct sk_skb_cb, data)) %
10380 prog->cb_access = 1;
10382 off -= offsetof(struct __sk_buff, cb[0]);
10383 off += offsetof(struct sk_buff, cb);
10384 off += offsetof(struct sk_skb_cb, data);
10385 if (type == BPF_WRITE)
10386 *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg,
10389 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg,
10395 return bpf_convert_ctx_access(type, si, insn_buf, prog,
10399 return insn - insn_buf;
10402 static u32 sk_msg_convert_ctx_access(enum bpf_access_type type,
10403 const struct bpf_insn *si,
10404 struct bpf_insn *insn_buf,
10405 struct bpf_prog *prog, u32 *target_size)
10407 struct bpf_insn *insn = insn_buf;
10408 #if IS_ENABLED(CONFIG_IPV6)
10412 /* convert ctx uses the fact sg element is first in struct */
10413 BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0);
10416 case offsetof(struct sk_msg_md, data):
10417 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data),
10418 si->dst_reg, si->src_reg,
10419 offsetof(struct sk_msg, data));
10421 case offsetof(struct sk_msg_md, data_end):
10422 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end),
10423 si->dst_reg, si->src_reg,
10424 offsetof(struct sk_msg, data_end));
10426 case offsetof(struct sk_msg_md, family):
10427 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2);
10429 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10430 struct sk_msg, sk),
10431 si->dst_reg, si->src_reg,
10432 offsetof(struct sk_msg, sk));
10433 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
10434 offsetof(struct sock_common, skc_family));
10437 case offsetof(struct sk_msg_md, remote_ip4):
10438 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4);
10440 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10441 struct sk_msg, sk),
10442 si->dst_reg, si->src_reg,
10443 offsetof(struct sk_msg, sk));
10444 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
10445 offsetof(struct sock_common, skc_daddr));
10448 case offsetof(struct sk_msg_md, local_ip4):
10449 BUILD_BUG_ON(sizeof_field(struct sock_common,
10450 skc_rcv_saddr) != 4);
10452 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10453 struct sk_msg, sk),
10454 si->dst_reg, si->src_reg,
10455 offsetof(struct sk_msg, sk));
10456 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
10457 offsetof(struct sock_common,
10461 case offsetof(struct sk_msg_md, remote_ip6[0]) ...
10462 offsetof(struct sk_msg_md, remote_ip6[3]):
10463 #if IS_ENABLED(CONFIG_IPV6)
10464 BUILD_BUG_ON(sizeof_field(struct sock_common,
10465 skc_v6_daddr.s6_addr32[0]) != 4);
10468 off -= offsetof(struct sk_msg_md, remote_ip6[0]);
10469 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10470 struct sk_msg, sk),
10471 si->dst_reg, si->src_reg,
10472 offsetof(struct sk_msg, sk));
10473 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
10474 offsetof(struct sock_common,
10475 skc_v6_daddr.s6_addr32[0]) +
10478 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
10482 case offsetof(struct sk_msg_md, local_ip6[0]) ...
10483 offsetof(struct sk_msg_md, local_ip6[3]):
10484 #if IS_ENABLED(CONFIG_IPV6)
10485 BUILD_BUG_ON(sizeof_field(struct sock_common,
10486 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
10489 off -= offsetof(struct sk_msg_md, local_ip6[0]);
10490 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10491 struct sk_msg, sk),
10492 si->dst_reg, si->src_reg,
10493 offsetof(struct sk_msg, sk));
10494 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
10495 offsetof(struct sock_common,
10496 skc_v6_rcv_saddr.s6_addr32[0]) +
10499 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
10503 case offsetof(struct sk_msg_md, remote_port):
10504 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2);
10506 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10507 struct sk_msg, sk),
10508 si->dst_reg, si->src_reg,
10509 offsetof(struct sk_msg, sk));
10510 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
10511 offsetof(struct sock_common, skc_dport));
10512 #ifndef __BIG_ENDIAN_BITFIELD
10513 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
10517 case offsetof(struct sk_msg_md, local_port):
10518 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2);
10520 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
10521 struct sk_msg, sk),
10522 si->dst_reg, si->src_reg,
10523 offsetof(struct sk_msg, sk));
10524 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
10525 offsetof(struct sock_common, skc_num));
10528 case offsetof(struct sk_msg_md, size):
10529 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size),
10530 si->dst_reg, si->src_reg,
10531 offsetof(struct sk_msg_sg, size));
10534 case offsetof(struct sk_msg_md, sk):
10535 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, sk),
10536 si->dst_reg, si->src_reg,
10537 offsetof(struct sk_msg, sk));
10541 return insn - insn_buf;
10544 const struct bpf_verifier_ops sk_filter_verifier_ops = {
10545 .get_func_proto = sk_filter_func_proto,
10546 .is_valid_access = sk_filter_is_valid_access,
10547 .convert_ctx_access = bpf_convert_ctx_access,
10548 .gen_ld_abs = bpf_gen_ld_abs,
10551 const struct bpf_prog_ops sk_filter_prog_ops = {
10552 .test_run = bpf_prog_test_run_skb,
10555 const struct bpf_verifier_ops tc_cls_act_verifier_ops = {
10556 .get_func_proto = tc_cls_act_func_proto,
10557 .is_valid_access = tc_cls_act_is_valid_access,
10558 .convert_ctx_access = tc_cls_act_convert_ctx_access,
10559 .gen_prologue = tc_cls_act_prologue,
10560 .gen_ld_abs = bpf_gen_ld_abs,
10563 const struct bpf_prog_ops tc_cls_act_prog_ops = {
10564 .test_run = bpf_prog_test_run_skb,
10567 const struct bpf_verifier_ops xdp_verifier_ops = {
10568 .get_func_proto = xdp_func_proto,
10569 .is_valid_access = xdp_is_valid_access,
10570 .convert_ctx_access = xdp_convert_ctx_access,
10571 .gen_prologue = bpf_noop_prologue,
10574 const struct bpf_prog_ops xdp_prog_ops = {
10575 .test_run = bpf_prog_test_run_xdp,
10578 const struct bpf_verifier_ops cg_skb_verifier_ops = {
10579 .get_func_proto = cg_skb_func_proto,
10580 .is_valid_access = cg_skb_is_valid_access,
10581 .convert_ctx_access = bpf_convert_ctx_access,
10584 const struct bpf_prog_ops cg_skb_prog_ops = {
10585 .test_run = bpf_prog_test_run_skb,
10588 const struct bpf_verifier_ops lwt_in_verifier_ops = {
10589 .get_func_proto = lwt_in_func_proto,
10590 .is_valid_access = lwt_is_valid_access,
10591 .convert_ctx_access = bpf_convert_ctx_access,
10594 const struct bpf_prog_ops lwt_in_prog_ops = {
10595 .test_run = bpf_prog_test_run_skb,
10598 const struct bpf_verifier_ops lwt_out_verifier_ops = {
10599 .get_func_proto = lwt_out_func_proto,
10600 .is_valid_access = lwt_is_valid_access,
10601 .convert_ctx_access = bpf_convert_ctx_access,
10604 const struct bpf_prog_ops lwt_out_prog_ops = {
10605 .test_run = bpf_prog_test_run_skb,
10608 const struct bpf_verifier_ops lwt_xmit_verifier_ops = {
10609 .get_func_proto = lwt_xmit_func_proto,
10610 .is_valid_access = lwt_is_valid_access,
10611 .convert_ctx_access = bpf_convert_ctx_access,
10612 .gen_prologue = tc_cls_act_prologue,
10615 const struct bpf_prog_ops lwt_xmit_prog_ops = {
10616 .test_run = bpf_prog_test_run_skb,
10619 const struct bpf_verifier_ops lwt_seg6local_verifier_ops = {
10620 .get_func_proto = lwt_seg6local_func_proto,
10621 .is_valid_access = lwt_is_valid_access,
10622 .convert_ctx_access = bpf_convert_ctx_access,
10625 const struct bpf_prog_ops lwt_seg6local_prog_ops = {
10626 .test_run = bpf_prog_test_run_skb,
10629 const struct bpf_verifier_ops cg_sock_verifier_ops = {
10630 .get_func_proto = sock_filter_func_proto,
10631 .is_valid_access = sock_filter_is_valid_access,
10632 .convert_ctx_access = bpf_sock_convert_ctx_access,
10635 const struct bpf_prog_ops cg_sock_prog_ops = {
10638 const struct bpf_verifier_ops cg_sock_addr_verifier_ops = {
10639 .get_func_proto = sock_addr_func_proto,
10640 .is_valid_access = sock_addr_is_valid_access,
10641 .convert_ctx_access = sock_addr_convert_ctx_access,
10644 const struct bpf_prog_ops cg_sock_addr_prog_ops = {
10647 const struct bpf_verifier_ops sock_ops_verifier_ops = {
10648 .get_func_proto = sock_ops_func_proto,
10649 .is_valid_access = sock_ops_is_valid_access,
10650 .convert_ctx_access = sock_ops_convert_ctx_access,
10653 const struct bpf_prog_ops sock_ops_prog_ops = {
10656 const struct bpf_verifier_ops sk_skb_verifier_ops = {
10657 .get_func_proto = sk_skb_func_proto,
10658 .is_valid_access = sk_skb_is_valid_access,
10659 .convert_ctx_access = sk_skb_convert_ctx_access,
10660 .gen_prologue = sk_skb_prologue,
10663 const struct bpf_prog_ops sk_skb_prog_ops = {
10666 const struct bpf_verifier_ops sk_msg_verifier_ops = {
10667 .get_func_proto = sk_msg_func_proto,
10668 .is_valid_access = sk_msg_is_valid_access,
10669 .convert_ctx_access = sk_msg_convert_ctx_access,
10670 .gen_prologue = bpf_noop_prologue,
10673 const struct bpf_prog_ops sk_msg_prog_ops = {
10676 const struct bpf_verifier_ops flow_dissector_verifier_ops = {
10677 .get_func_proto = flow_dissector_func_proto,
10678 .is_valid_access = flow_dissector_is_valid_access,
10679 .convert_ctx_access = flow_dissector_convert_ctx_access,
10682 const struct bpf_prog_ops flow_dissector_prog_ops = {
10683 .test_run = bpf_prog_test_run_flow_dissector,
10686 int sk_detach_filter(struct sock *sk)
10689 struct sk_filter *filter;
10691 if (sock_flag(sk, SOCK_FILTER_LOCKED))
10694 filter = rcu_dereference_protected(sk->sk_filter,
10695 lockdep_sock_is_held(sk));
10697 RCU_INIT_POINTER(sk->sk_filter, NULL);
10698 sk_filter_uncharge(sk, filter);
10704 EXPORT_SYMBOL_GPL(sk_detach_filter);
10706 int sk_get_filter(struct sock *sk, sockptr_t optval, unsigned int len)
10708 struct sock_fprog_kern *fprog;
10709 struct sk_filter *filter;
10712 sockopt_lock_sock(sk);
10713 filter = rcu_dereference_protected(sk->sk_filter,
10714 lockdep_sock_is_held(sk));
10718 /* We're copying the filter that has been originally attached,
10719 * so no conversion/decode needed anymore. eBPF programs that
10720 * have no original program cannot be dumped through this.
10723 fprog = filter->prog->orig_prog;
10729 /* User space only enquires number of filter blocks. */
10733 if (len < fprog->len)
10737 if (copy_to_sockptr(optval, fprog->filter, bpf_classic_proglen(fprog)))
10740 /* Instead of bytes, the API requests to return the number
10741 * of filter blocks.
10745 sockopt_release_sock(sk);
10750 static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern,
10751 struct sock_reuseport *reuse,
10752 struct sock *sk, struct sk_buff *skb,
10753 struct sock *migrating_sk,
10756 reuse_kern->skb = skb;
10757 reuse_kern->sk = sk;
10758 reuse_kern->selected_sk = NULL;
10759 reuse_kern->migrating_sk = migrating_sk;
10760 reuse_kern->data_end = skb->data + skb_headlen(skb);
10761 reuse_kern->hash = hash;
10762 reuse_kern->reuseport_id = reuse->reuseport_id;
10763 reuse_kern->bind_inany = reuse->bind_inany;
10766 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
10767 struct bpf_prog *prog, struct sk_buff *skb,
10768 struct sock *migrating_sk,
10771 struct sk_reuseport_kern reuse_kern;
10772 enum sk_action action;
10774 bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, migrating_sk, hash);
10775 action = bpf_prog_run(prog, &reuse_kern);
10777 if (action == SK_PASS)
10778 return reuse_kern.selected_sk;
10780 return ERR_PTR(-ECONNREFUSED);
10783 BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern,
10784 struct bpf_map *, map, void *, key, u32, flags)
10786 bool is_sockarray = map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY;
10787 struct sock_reuseport *reuse;
10788 struct sock *selected_sk;
10790 selected_sk = map->ops->map_lookup_elem(map, key);
10794 reuse = rcu_dereference(selected_sk->sk_reuseport_cb);
10796 /* Lookup in sock_map can return TCP ESTABLISHED sockets. */
10797 if (sk_is_refcounted(selected_sk))
10798 sock_put(selected_sk);
10800 /* reuseport_array has only sk with non NULL sk_reuseport_cb.
10801 * The only (!reuse) case here is - the sk has already been
10802 * unhashed (e.g. by close()), so treat it as -ENOENT.
10804 * Other maps (e.g. sock_map) do not provide this guarantee and
10805 * the sk may never be in the reuseport group to begin with.
10807 return is_sockarray ? -ENOENT : -EINVAL;
10810 if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) {
10811 struct sock *sk = reuse_kern->sk;
10813 if (sk->sk_protocol != selected_sk->sk_protocol)
10814 return -EPROTOTYPE;
10815 else if (sk->sk_family != selected_sk->sk_family)
10816 return -EAFNOSUPPORT;
10818 /* Catch all. Likely bound to a different sockaddr. */
10822 reuse_kern->selected_sk = selected_sk;
10827 static const struct bpf_func_proto sk_select_reuseport_proto = {
10828 .func = sk_select_reuseport,
10830 .ret_type = RET_INTEGER,
10831 .arg1_type = ARG_PTR_TO_CTX,
10832 .arg2_type = ARG_CONST_MAP_PTR,
10833 .arg3_type = ARG_PTR_TO_MAP_KEY,
10834 .arg4_type = ARG_ANYTHING,
10837 BPF_CALL_4(sk_reuseport_load_bytes,
10838 const struct sk_reuseport_kern *, reuse_kern, u32, offset,
10839 void *, to, u32, len)
10841 return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len);
10844 static const struct bpf_func_proto sk_reuseport_load_bytes_proto = {
10845 .func = sk_reuseport_load_bytes,
10847 .ret_type = RET_INTEGER,
10848 .arg1_type = ARG_PTR_TO_CTX,
10849 .arg2_type = ARG_ANYTHING,
10850 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
10851 .arg4_type = ARG_CONST_SIZE,
10854 BPF_CALL_5(sk_reuseport_load_bytes_relative,
10855 const struct sk_reuseport_kern *, reuse_kern, u32, offset,
10856 void *, to, u32, len, u32, start_header)
10858 return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to,
10859 len, start_header);
10862 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = {
10863 .func = sk_reuseport_load_bytes_relative,
10865 .ret_type = RET_INTEGER,
10866 .arg1_type = ARG_PTR_TO_CTX,
10867 .arg2_type = ARG_ANYTHING,
10868 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
10869 .arg4_type = ARG_CONST_SIZE,
10870 .arg5_type = ARG_ANYTHING,
10873 static const struct bpf_func_proto *
10874 sk_reuseport_func_proto(enum bpf_func_id func_id,
10875 const struct bpf_prog *prog)
10878 case BPF_FUNC_sk_select_reuseport:
10879 return &sk_select_reuseport_proto;
10880 case BPF_FUNC_skb_load_bytes:
10881 return &sk_reuseport_load_bytes_proto;
10882 case BPF_FUNC_skb_load_bytes_relative:
10883 return &sk_reuseport_load_bytes_relative_proto;
10884 case BPF_FUNC_get_socket_cookie:
10885 return &bpf_get_socket_ptr_cookie_proto;
10886 case BPF_FUNC_ktime_get_coarse_ns:
10887 return &bpf_ktime_get_coarse_ns_proto;
10889 return bpf_base_func_proto(func_id);
10894 sk_reuseport_is_valid_access(int off, int size,
10895 enum bpf_access_type type,
10896 const struct bpf_prog *prog,
10897 struct bpf_insn_access_aux *info)
10899 const u32 size_default = sizeof(__u32);
10901 if (off < 0 || off >= sizeof(struct sk_reuseport_md) ||
10902 off % size || type != BPF_READ)
10906 case offsetof(struct sk_reuseport_md, data):
10907 info->reg_type = PTR_TO_PACKET;
10908 return size == sizeof(__u64);
10910 case offsetof(struct sk_reuseport_md, data_end):
10911 info->reg_type = PTR_TO_PACKET_END;
10912 return size == sizeof(__u64);
10914 case offsetof(struct sk_reuseport_md, hash):
10915 return size == size_default;
10917 case offsetof(struct sk_reuseport_md, sk):
10918 info->reg_type = PTR_TO_SOCKET;
10919 return size == sizeof(__u64);
10921 case offsetof(struct sk_reuseport_md, migrating_sk):
10922 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL;
10923 return size == sizeof(__u64);
10925 /* Fields that allow narrowing */
10926 case bpf_ctx_range(struct sk_reuseport_md, eth_protocol):
10927 if (size < sizeof_field(struct sk_buff, protocol))
10930 case bpf_ctx_range(struct sk_reuseport_md, ip_protocol):
10931 case bpf_ctx_range(struct sk_reuseport_md, bind_inany):
10932 case bpf_ctx_range(struct sk_reuseport_md, len):
10933 bpf_ctx_record_field_size(info, size_default);
10934 return bpf_ctx_narrow_access_ok(off, size, size_default);
10941 #define SK_REUSEPORT_LOAD_FIELD(F) ({ \
10942 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \
10943 si->dst_reg, si->src_reg, \
10944 bpf_target_off(struct sk_reuseport_kern, F, \
10945 sizeof_field(struct sk_reuseport_kern, F), \
10949 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \
10950 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \
10955 #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD) \
10956 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \
10961 static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type,
10962 const struct bpf_insn *si,
10963 struct bpf_insn *insn_buf,
10964 struct bpf_prog *prog,
10967 struct bpf_insn *insn = insn_buf;
10970 case offsetof(struct sk_reuseport_md, data):
10971 SK_REUSEPORT_LOAD_SKB_FIELD(data);
10974 case offsetof(struct sk_reuseport_md, len):
10975 SK_REUSEPORT_LOAD_SKB_FIELD(len);
10978 case offsetof(struct sk_reuseport_md, eth_protocol):
10979 SK_REUSEPORT_LOAD_SKB_FIELD(protocol);
10982 case offsetof(struct sk_reuseport_md, ip_protocol):
10983 SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol);
10986 case offsetof(struct sk_reuseport_md, data_end):
10987 SK_REUSEPORT_LOAD_FIELD(data_end);
10990 case offsetof(struct sk_reuseport_md, hash):
10991 SK_REUSEPORT_LOAD_FIELD(hash);
10994 case offsetof(struct sk_reuseport_md, bind_inany):
10995 SK_REUSEPORT_LOAD_FIELD(bind_inany);
10998 case offsetof(struct sk_reuseport_md, sk):
10999 SK_REUSEPORT_LOAD_FIELD(sk);
11002 case offsetof(struct sk_reuseport_md, migrating_sk):
11003 SK_REUSEPORT_LOAD_FIELD(migrating_sk);
11007 return insn - insn_buf;
11010 const struct bpf_verifier_ops sk_reuseport_verifier_ops = {
11011 .get_func_proto = sk_reuseport_func_proto,
11012 .is_valid_access = sk_reuseport_is_valid_access,
11013 .convert_ctx_access = sk_reuseport_convert_ctx_access,
11016 const struct bpf_prog_ops sk_reuseport_prog_ops = {
11019 DEFINE_STATIC_KEY_FALSE(bpf_sk_lookup_enabled);
11020 EXPORT_SYMBOL(bpf_sk_lookup_enabled);
11022 BPF_CALL_3(bpf_sk_lookup_assign, struct bpf_sk_lookup_kern *, ctx,
11023 struct sock *, sk, u64, flags)
11025 if (unlikely(flags & ~(BPF_SK_LOOKUP_F_REPLACE |
11026 BPF_SK_LOOKUP_F_NO_REUSEPORT)))
11028 if (unlikely(sk && sk_is_refcounted(sk)))
11029 return -ESOCKTNOSUPPORT; /* reject non-RCU freed sockets */
11030 if (unlikely(sk && sk_is_tcp(sk) && sk->sk_state != TCP_LISTEN))
11031 return -ESOCKTNOSUPPORT; /* only accept TCP socket in LISTEN */
11032 if (unlikely(sk && sk_is_udp(sk) && sk->sk_state != TCP_CLOSE))
11033 return -ESOCKTNOSUPPORT; /* only accept UDP socket in CLOSE */
11035 /* Check if socket is suitable for packet L3/L4 protocol */
11036 if (sk && sk->sk_protocol != ctx->protocol)
11037 return -EPROTOTYPE;
11038 if (sk && sk->sk_family != ctx->family &&
11039 (sk->sk_family == AF_INET || ipv6_only_sock(sk)))
11040 return -EAFNOSUPPORT;
11042 if (ctx->selected_sk && !(flags & BPF_SK_LOOKUP_F_REPLACE))
11045 /* Select socket as lookup result */
11046 ctx->selected_sk = sk;
11047 ctx->no_reuseport = flags & BPF_SK_LOOKUP_F_NO_REUSEPORT;
11051 static const struct bpf_func_proto bpf_sk_lookup_assign_proto = {
11052 .func = bpf_sk_lookup_assign,
11054 .ret_type = RET_INTEGER,
11055 .arg1_type = ARG_PTR_TO_CTX,
11056 .arg2_type = ARG_PTR_TO_SOCKET_OR_NULL,
11057 .arg3_type = ARG_ANYTHING,
11060 static const struct bpf_func_proto *
11061 sk_lookup_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
11064 case BPF_FUNC_perf_event_output:
11065 return &bpf_event_output_data_proto;
11066 case BPF_FUNC_sk_assign:
11067 return &bpf_sk_lookup_assign_proto;
11068 case BPF_FUNC_sk_release:
11069 return &bpf_sk_release_proto;
11071 return bpf_sk_base_func_proto(func_id);
11075 static bool sk_lookup_is_valid_access(int off, int size,
11076 enum bpf_access_type type,
11077 const struct bpf_prog *prog,
11078 struct bpf_insn_access_aux *info)
11080 if (off < 0 || off >= sizeof(struct bpf_sk_lookup))
11082 if (off % size != 0)
11084 if (type != BPF_READ)
11088 case offsetof(struct bpf_sk_lookup, sk):
11089 info->reg_type = PTR_TO_SOCKET_OR_NULL;
11090 return size == sizeof(__u64);
11092 case bpf_ctx_range(struct bpf_sk_lookup, family):
11093 case bpf_ctx_range(struct bpf_sk_lookup, protocol):
11094 case bpf_ctx_range(struct bpf_sk_lookup, remote_ip4):
11095 case bpf_ctx_range(struct bpf_sk_lookup, local_ip4):
11096 case bpf_ctx_range_till(struct bpf_sk_lookup, remote_ip6[0], remote_ip6[3]):
11097 case bpf_ctx_range_till(struct bpf_sk_lookup, local_ip6[0], local_ip6[3]):
11098 case bpf_ctx_range(struct bpf_sk_lookup, local_port):
11099 case bpf_ctx_range(struct bpf_sk_lookup, ingress_ifindex):
11100 bpf_ctx_record_field_size(info, sizeof(__u32));
11101 return bpf_ctx_narrow_access_ok(off, size, sizeof(__u32));
11103 case bpf_ctx_range(struct bpf_sk_lookup, remote_port):
11104 /* Allow 4-byte access to 2-byte field for backward compatibility */
11105 if (size == sizeof(__u32))
11107 bpf_ctx_record_field_size(info, sizeof(__be16));
11108 return bpf_ctx_narrow_access_ok(off, size, sizeof(__be16));
11110 case offsetofend(struct bpf_sk_lookup, remote_port) ...
11111 offsetof(struct bpf_sk_lookup, local_ip4) - 1:
11112 /* Allow access to zero padding for backward compatibility */
11113 bpf_ctx_record_field_size(info, sizeof(__u16));
11114 return bpf_ctx_narrow_access_ok(off, size, sizeof(__u16));
11121 static u32 sk_lookup_convert_ctx_access(enum bpf_access_type type,
11122 const struct bpf_insn *si,
11123 struct bpf_insn *insn_buf,
11124 struct bpf_prog *prog,
11127 struct bpf_insn *insn = insn_buf;
11130 case offsetof(struct bpf_sk_lookup, sk):
11131 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg,
11132 offsetof(struct bpf_sk_lookup_kern, selected_sk));
11135 case offsetof(struct bpf_sk_lookup, family):
11136 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
11137 bpf_target_off(struct bpf_sk_lookup_kern,
11138 family, 2, target_size));
11141 case offsetof(struct bpf_sk_lookup, protocol):
11142 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
11143 bpf_target_off(struct bpf_sk_lookup_kern,
11144 protocol, 2, target_size));
11147 case offsetof(struct bpf_sk_lookup, remote_ip4):
11148 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
11149 bpf_target_off(struct bpf_sk_lookup_kern,
11150 v4.saddr, 4, target_size));
11153 case offsetof(struct bpf_sk_lookup, local_ip4):
11154 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
11155 bpf_target_off(struct bpf_sk_lookup_kern,
11156 v4.daddr, 4, target_size));
11159 case bpf_ctx_range_till(struct bpf_sk_lookup,
11160 remote_ip6[0], remote_ip6[3]): {
11161 #if IS_ENABLED(CONFIG_IPV6)
11164 off -= offsetof(struct bpf_sk_lookup, remote_ip6[0]);
11165 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size);
11166 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg,
11167 offsetof(struct bpf_sk_lookup_kern, v6.saddr));
11168 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
11169 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off);
11171 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
11175 case bpf_ctx_range_till(struct bpf_sk_lookup,
11176 local_ip6[0], local_ip6[3]): {
11177 #if IS_ENABLED(CONFIG_IPV6)
11180 off -= offsetof(struct bpf_sk_lookup, local_ip6[0]);
11181 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size);
11182 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg,
11183 offsetof(struct bpf_sk_lookup_kern, v6.daddr));
11184 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
11185 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off);
11187 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
11191 case offsetof(struct bpf_sk_lookup, remote_port):
11192 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
11193 bpf_target_off(struct bpf_sk_lookup_kern,
11194 sport, 2, target_size));
11197 case offsetofend(struct bpf_sk_lookup, remote_port):
11199 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
11202 case offsetof(struct bpf_sk_lookup, local_port):
11203 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
11204 bpf_target_off(struct bpf_sk_lookup_kern,
11205 dport, 2, target_size));
11208 case offsetof(struct bpf_sk_lookup, ingress_ifindex):
11209 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
11210 bpf_target_off(struct bpf_sk_lookup_kern,
11211 ingress_ifindex, 4, target_size));
11215 return insn - insn_buf;
11218 const struct bpf_prog_ops sk_lookup_prog_ops = {
11219 .test_run = bpf_prog_test_run_sk_lookup,
11222 const struct bpf_verifier_ops sk_lookup_verifier_ops = {
11223 .get_func_proto = sk_lookup_func_proto,
11224 .is_valid_access = sk_lookup_is_valid_access,
11225 .convert_ctx_access = sk_lookup_convert_ctx_access,
11228 #endif /* CONFIG_INET */
11230 DEFINE_BPF_DISPATCHER(xdp)
11232 void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog)
11234 bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(xdp), prev_prog, prog);
11237 BTF_ID_LIST_GLOBAL(btf_sock_ids, MAX_BTF_SOCK_TYPE)
11238 #define BTF_SOCK_TYPE(name, type) BTF_ID(struct, type)
11240 #undef BTF_SOCK_TYPE
11242 BPF_CALL_1(bpf_skc_to_tcp6_sock, struct sock *, sk)
11244 /* tcp6_sock type is not generated in dwarf and hence btf,
11245 * trigger an explicit type generation here.
11247 BTF_TYPE_EMIT(struct tcp6_sock);
11248 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP &&
11249 sk->sk_family == AF_INET6)
11250 return (unsigned long)sk;
11252 return (unsigned long)NULL;
11255 const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto = {
11256 .func = bpf_skc_to_tcp6_sock,
11258 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL,
11259 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
11260 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP6],
11263 BPF_CALL_1(bpf_skc_to_tcp_sock, struct sock *, sk)
11265 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP)
11266 return (unsigned long)sk;
11268 return (unsigned long)NULL;
11271 const struct bpf_func_proto bpf_skc_to_tcp_sock_proto = {
11272 .func = bpf_skc_to_tcp_sock,
11274 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL,
11275 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
11276 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP],
11279 BPF_CALL_1(bpf_skc_to_tcp_timewait_sock, struct sock *, sk)
11281 /* BTF types for tcp_timewait_sock and inet_timewait_sock are not
11282 * generated if CONFIG_INET=n. Trigger an explicit generation here.
11284 BTF_TYPE_EMIT(struct inet_timewait_sock);
11285 BTF_TYPE_EMIT(struct tcp_timewait_sock);
11288 if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_TIME_WAIT)
11289 return (unsigned long)sk;
11292 #if IS_BUILTIN(CONFIG_IPV6)
11293 if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_TIME_WAIT)
11294 return (unsigned long)sk;
11297 return (unsigned long)NULL;
11300 const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto = {
11301 .func = bpf_skc_to_tcp_timewait_sock,
11303 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL,
11304 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
11305 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_TW],
11308 BPF_CALL_1(bpf_skc_to_tcp_request_sock, struct sock *, sk)
11311 if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_NEW_SYN_RECV)
11312 return (unsigned long)sk;
11315 #if IS_BUILTIN(CONFIG_IPV6)
11316 if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_NEW_SYN_RECV)
11317 return (unsigned long)sk;
11320 return (unsigned long)NULL;
11323 const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto = {
11324 .func = bpf_skc_to_tcp_request_sock,
11326 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL,
11327 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
11328 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_REQ],
11331 BPF_CALL_1(bpf_skc_to_udp6_sock, struct sock *, sk)
11333 /* udp6_sock type is not generated in dwarf and hence btf,
11334 * trigger an explicit type generation here.
11336 BTF_TYPE_EMIT(struct udp6_sock);
11337 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_UDP &&
11338 sk->sk_type == SOCK_DGRAM && sk->sk_family == AF_INET6)
11339 return (unsigned long)sk;
11341 return (unsigned long)NULL;
11344 const struct bpf_func_proto bpf_skc_to_udp6_sock_proto = {
11345 .func = bpf_skc_to_udp6_sock,
11347 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL,
11348 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
11349 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_UDP6],
11352 BPF_CALL_1(bpf_skc_to_unix_sock, struct sock *, sk)
11354 /* unix_sock type is not generated in dwarf and hence btf,
11355 * trigger an explicit type generation here.
11357 BTF_TYPE_EMIT(struct unix_sock);
11358 if (sk && sk_fullsock(sk) && sk->sk_family == AF_UNIX)
11359 return (unsigned long)sk;
11361 return (unsigned long)NULL;
11364 const struct bpf_func_proto bpf_skc_to_unix_sock_proto = {
11365 .func = bpf_skc_to_unix_sock,
11367 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL,
11368 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
11369 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_UNIX],
11372 BPF_CALL_1(bpf_skc_to_mptcp_sock, struct sock *, sk)
11374 BTF_TYPE_EMIT(struct mptcp_sock);
11375 return (unsigned long)bpf_mptcp_sock_from_subflow(sk);
11378 const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto = {
11379 .func = bpf_skc_to_mptcp_sock,
11381 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL,
11382 .arg1_type = ARG_PTR_TO_SOCK_COMMON,
11383 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_MPTCP],
11386 BPF_CALL_1(bpf_sock_from_file, struct file *, file)
11388 return (unsigned long)sock_from_file(file);
11391 BTF_ID_LIST(bpf_sock_from_file_btf_ids)
11392 BTF_ID(struct, socket)
11393 BTF_ID(struct, file)
11395 const struct bpf_func_proto bpf_sock_from_file_proto = {
11396 .func = bpf_sock_from_file,
11398 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL,
11399 .ret_btf_id = &bpf_sock_from_file_btf_ids[0],
11400 .arg1_type = ARG_PTR_TO_BTF_ID,
11401 .arg1_btf_id = &bpf_sock_from_file_btf_ids[1],
11404 static const struct bpf_func_proto *
11405 bpf_sk_base_func_proto(enum bpf_func_id func_id)
11407 const struct bpf_func_proto *func;
11410 case BPF_FUNC_skc_to_tcp6_sock:
11411 func = &bpf_skc_to_tcp6_sock_proto;
11413 case BPF_FUNC_skc_to_tcp_sock:
11414 func = &bpf_skc_to_tcp_sock_proto;
11416 case BPF_FUNC_skc_to_tcp_timewait_sock:
11417 func = &bpf_skc_to_tcp_timewait_sock_proto;
11419 case BPF_FUNC_skc_to_tcp_request_sock:
11420 func = &bpf_skc_to_tcp_request_sock_proto;
11422 case BPF_FUNC_skc_to_udp6_sock:
11423 func = &bpf_skc_to_udp6_sock_proto;
11425 case BPF_FUNC_skc_to_unix_sock:
11426 func = &bpf_skc_to_unix_sock_proto;
11428 case BPF_FUNC_skc_to_mptcp_sock:
11429 func = &bpf_skc_to_mptcp_sock_proto;
11431 case BPF_FUNC_ktime_get_coarse_ns:
11432 return &bpf_ktime_get_coarse_ns_proto;
11434 return bpf_base_func_proto(func_id);
11437 if (!perfmon_capable())