net/core/flow_dissector.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include <linux/kernel.h>
   3 #include <linux/skbuff.h>
   4 #include <linux/export.h>
   5 #include <linux/ip.h>
   6 #include <linux/ipv6.h>
   7 #include <linux/if_vlan.h>
   8 #include <net/dsa.h>
   9 #include <net/dst_metadata.h>
  10 #include <net/ip.h>
  11 #include <net/ipv6.h>
  12 #include <net/gre.h>
  13 #include <net/pptp.h>
  14 #include <net/tipc.h>
  15 #include <linux/igmp.h>
  16 #include <linux/icmp.h>
  17 #include <linux/sctp.h>
  18 #include <linux/dccp.h>
  19 #include <linux/if_tunnel.h>
  20 #include <linux/if_pppox.h>
  21 #include <linux/ppp_defs.h>
  22 #include <linux/stddef.h>
  23 #include <linux/if_ether.h>
  24 #include <linux/mpls.h>
  25 #include <linux/tcp.h>
  26 #include <linux/ptp_classify.h>
  27 #include <net/flow_dissector.h>
  28 #include <scsi/fc/fc_fcoe.h>
  29 #include <uapi/linux/batadv_packet.h>
  30 #include <linux/bpf.h>
  31 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
  32 #include <net/netfilter/nf_conntrack_core.h>
  33 #include <net/netfilter/nf_conntrack_labels.h>
  34 #endif
  35 #include <linux/bpf-netns.h>
  36
  37 static void dissector_set_key(struct flow_dissector *flow_dissector,
  38                               enum flow_dissector_key_id key_id)
  39 {
  40         flow_dissector->used_keys |= (1 << key_id);
  41 }
  42
  43 void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
  44                              const struct flow_dissector_key *key,
  45                              unsigned int key_count)
  46 {
  47         unsigned int i;
  48
  49         memset(flow_dissector, 0, sizeof(*flow_dissector));
  50
  51         for (i = 0; i < key_count; i++, key++) {
  52                 /* User should make sure that every key target offset is within
  53                  * boundaries of unsigned short.
  54                  */
  55                 BUG_ON(key->offset > USHRT_MAX);
  56                 BUG_ON(dissector_uses_key(flow_dissector,
  57                                           key->key_id));
  58
  59                 dissector_set_key(flow_dissector, key->key_id);
  60                 flow_dissector->offset[key->key_id] = key->offset;
  61         }
  62
  63         /* Ensure that the dissector always includes control and basic key.
  64          * That way we are able to avoid handling lack of these in fast path.
  65          */
  66         BUG_ON(!dissector_uses_key(flow_dissector,
  67                                    FLOW_DISSECTOR_KEY_CONTROL));
  68         BUG_ON(!dissector_uses_key(flow_dissector,
  69                                    FLOW_DISSECTOR_KEY_BASIC));
  70 }
  71 EXPORT_SYMBOL(skb_flow_dissector_init);
  72
  73 #ifdef CONFIG_BPF_SYSCALL
  74 int flow_dissector_bpf_prog_attach_check(struct net *net,
  75                                          struct bpf_prog *prog)
  76 {
  77         enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR;
  78
  79         if (net == &init_net) {
  80                 /* BPF flow dissector in the root namespace overrides
  81                  * any per-net-namespace one. When attaching to root,
  82                  * make sure we don't have any BPF program attached
  83                  * to the non-root namespaces.
  84                  */
  85                 struct net *ns;
  86
  87                 for_each_net(ns) {
  88                         if (ns == &init_net)
  89                                 continue;
  90                         if (rcu_access_pointer(ns->bpf.run_array[type]))
  91                                 return -EEXIST;
  92                 }
  93         } else {
  94                 /* Make sure root flow dissector is not attached
  95                  * when attaching to the non-root namespace.
  96                  */
  97                 if (rcu_access_pointer(init_net.bpf.run_array[type]))
  98                         return -EEXIST;
  99         }
 100
 101         return 0;
 102 }
 103 #endif /* CONFIG_BPF_SYSCALL */
 104
 105 /**
 106  * __skb_flow_get_ports - extract the upper layer ports and return them
 107  * @skb: sk_buff to extract the ports from
 108  * @thoff: transport header offset
 109  * @ip_proto: protocol for which to get port offset
 110  * @data: raw buffer pointer to the packet, if NULL use skb->data
 111  * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
 112  *
 113  * The function will try to retrieve the ports at offset thoff + poff where poff
 114  * is the protocol port offset returned from proto_ports_offset
 115  */
 116 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
 117                             const void *data, int hlen)
 118 {
 119         int poff = proto_ports_offset(ip_proto);
 120
 121         if (!data) {
 122                 data = skb->data;
 123                 hlen = skb_headlen(skb);
 124         }
 125
 126         if (poff >= 0) {
 127                 __be32 *ports, _ports;
 128
 129                 ports = __skb_header_pointer(skb, thoff + poff,
 130                                              sizeof(_ports), data, hlen, &_ports);
 131                 if (ports)
 132                         return *ports;
 133         }
 134
 135         return 0;
 136 }
 137 EXPORT_SYMBOL(__skb_flow_get_ports);
 138
 139 static bool icmp_has_id(u8 type)
 140 {
 141         switch (type) {
 142         case ICMP_ECHO:
 143         case ICMP_ECHOREPLY:
 144         case ICMP_TIMESTAMP:
 145         case ICMP_TIMESTAMPREPLY:
 146         case ICMPV6_ECHO_REQUEST:
 147         case ICMPV6_ECHO_REPLY:
 148                 return true;
 149         }
 150
 151         return false;
 152 }
 153
 154 /**
 155  * skb_flow_get_icmp_tci - extract ICMP(6) Type, Code and Identifier fields
 156  * @skb: sk_buff to extract from
 157  * @key_icmp: struct flow_dissector_key_icmp to fill
 158  * @data: raw buffer pointer to the packet
 159  * @thoff: offset to extract at
 160  * @hlen: packet header length
 161  */
 162 void skb_flow_get_icmp_tci(const struct sk_buff *skb,
 163                            struct flow_dissector_key_icmp *key_icmp,
 164                            const void *data, int thoff, int hlen)
 165 {
 166         struct icmphdr *ih, _ih;
 167
 168         ih = __skb_header_pointer(skb, thoff, sizeof(_ih), data, hlen, &_ih);
 169         if (!ih)
 170                 return;
 171
 172         key_icmp->type = ih->type;
 173         key_icmp->code = ih->code;
 174
 175         /* As we use 0 to signal that the Id field is not present,
 176          * avoid confusion with packets without such field
 177          */
 178         if (icmp_has_id(ih->type))
 179                 key_icmp->id = ih->un.echo.id ? ntohs(ih->un.echo.id) : 1;
 180         else
 181                 key_icmp->id = 0;
 182 }
 183 EXPORT_SYMBOL(skb_flow_get_icmp_tci);
 184
 185 /* If FLOW_DISSECTOR_KEY_ICMP is set, dissect an ICMP packet
 186  * using skb_flow_get_icmp_tci().
 187  */
 188 static void __skb_flow_dissect_icmp(const struct sk_buff *skb,
 189                                     struct flow_dissector *flow_dissector,
 190                                     void *target_container, const void *data,
 191                                     int thoff, int hlen)
 192 {
 193         struct flow_dissector_key_icmp *key_icmp;
 194
 195         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ICMP))
 196                 return;
 197
 198         key_icmp = skb_flow_dissector_target(flow_dissector,
 199                                              FLOW_DISSECTOR_KEY_ICMP,
 200                                              target_container);
 201
 202         skb_flow_get_icmp_tci(skb, key_icmp, data, thoff, hlen);
 203 }
 204
 205 void skb_flow_dissect_meta(const struct sk_buff *skb,
 206                            struct flow_dissector *flow_dissector,
 207                            void *target_container)
 208 {
 209         struct flow_dissector_key_meta *meta;
 210
 211         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_META))
 212                 return;
 213
 214         meta = skb_flow_dissector_target(flow_dissector,
 215                                          FLOW_DISSECTOR_KEY_META,
 216                                          target_container);
 217         meta->ingress_ifindex = skb->skb_iif;
 218 }
 219 EXPORT_SYMBOL(skb_flow_dissect_meta);
 220
 221 static void
 222 skb_flow_dissect_set_enc_addr_type(enum flow_dissector_key_id type,
 223                                    struct flow_dissector *flow_dissector,
 224                                    void *target_container)
 225 {
 226         struct flow_dissector_key_control *ctrl;
 227
 228         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_CONTROL))
 229                 return;
 230
 231         ctrl = skb_flow_dissector_target(flow_dissector,
 232                                          FLOW_DISSECTOR_KEY_ENC_CONTROL,
 233                                          target_container);
 234         ctrl->addr_type = type;
 235 }
 236
 237 void
 238 skb_flow_dissect_ct(const struct sk_buff *skb,
 239                     struct flow_dissector *flow_dissector,
 240                     void *target_container, u16 *ctinfo_map,
 241                     size_t mapsize, bool post_ct, u16 zone)
 242 {
 243 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 244         struct flow_dissector_key_ct *key;
 245         enum ip_conntrack_info ctinfo;
 246         struct nf_conn_labels *cl;
 247         struct nf_conn *ct;
 248
 249         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CT))
 250                 return;
 251
 252         ct = nf_ct_get(skb, &ctinfo);
 253         if (!ct && !post_ct)
 254                 return;
 255
 256         key = skb_flow_dissector_target(flow_dissector,
 257                                         FLOW_DISSECTOR_KEY_CT,
 258                                         target_container);
 259
 260         if (!ct) {
 261                 key->ct_state = TCA_FLOWER_KEY_CT_FLAGS_TRACKED |
 262                                 TCA_FLOWER_KEY_CT_FLAGS_INVALID;
 263                 key->ct_zone = zone;
 264                 return;
 265         }
 266
 267         if (ctinfo < mapsize)
 268                 key->ct_state = ctinfo_map[ctinfo];
 269 #if IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)
 270         key->ct_zone = ct->zone.id;
 271 #endif
 272 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
 273         key->ct_mark = ct->mark;
 274 #endif
 275
 276         cl = nf_ct_labels_find(ct);
 277         if (cl)
 278                 memcpy(key->ct_labels, cl->bits, sizeof(key->ct_labels));
 279 #endif /* CONFIG_NF_CONNTRACK */
 280 }
 281 EXPORT_SYMBOL(skb_flow_dissect_ct);
 282
 283 void
 284 skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
 285                              struct flow_dissector *flow_dissector,
 286                              void *target_container)
 287 {
 288         struct ip_tunnel_info *info;
 289         struct ip_tunnel_key *key;
 290
 291         /* A quick check to see if there might be something to do. */
 292         if (!dissector_uses_key(flow_dissector,
 293                                 FLOW_DISSECTOR_KEY_ENC_KEYID) &&
 294             !dissector_uses_key(flow_dissector,
 295                                 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) &&
 296             !dissector_uses_key(flow_dissector,
 297                                 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) &&
 298             !dissector_uses_key(flow_dissector,
 299                                 FLOW_DISSECTOR_KEY_ENC_CONTROL) &&
 300             !dissector_uses_key(flow_dissector,
 301                                 FLOW_DISSECTOR_KEY_ENC_PORTS) &&
 302             !dissector_uses_key(flow_dissector,
 303                                 FLOW_DISSECTOR_KEY_ENC_IP) &&
 304             !dissector_uses_key(flow_dissector,
 305                                 FLOW_DISSECTOR_KEY_ENC_OPTS))
 306                 return;
 307
 308         info = skb_tunnel_info(skb);
 309         if (!info)
 310                 return;
 311
 312         key = &info->key;
 313
 314         switch (ip_tunnel_info_af(info)) {
 315         case AF_INET:
 316                 skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 317                                                    flow_dissector,
 318                                                    target_container);
 319                 if (dissector_uses_key(flow_dissector,
 320                                        FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
 321                         struct flow_dissector_key_ipv4_addrs *ipv4;
 322
 323                         ipv4 = skb_flow_dissector_target(flow_dissector,
 324                                                          FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
 325                                                          target_container);
 326                         ipv4->src = key->u.ipv4.src;
 327                         ipv4->dst = key->u.ipv4.dst;
 328                 }
 329                 break;
 330         case AF_INET6:
 331                 skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 332                                                    flow_dissector,
 333                                                    target_container);
 334                 if (dissector_uses_key(flow_dissector,
 335                                        FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) {
 336                         struct flow_dissector_key_ipv6_addrs *ipv6;
 337
 338                         ipv6 = skb_flow_dissector_target(flow_dissector,
 339                                                          FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS,
 340                                                          target_container);
 341                         ipv6->src = key->u.ipv6.src;
 342                         ipv6->dst = key->u.ipv6.dst;
 343                 }
 344                 break;
 345         }
 346
 347         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
 348                 struct flow_dissector_key_keyid *keyid;
 349
 350                 keyid = skb_flow_dissector_target(flow_dissector,
 351                                                   FLOW_DISSECTOR_KEY_ENC_KEYID,
 352                                                   target_container);
 353                 keyid->keyid = tunnel_id_to_key32(key->tun_id);
 354         }
 355
 356         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
 357                 struct flow_dissector_key_ports *tp;
 358
 359                 tp = skb_flow_dissector_target(flow_dissector,
 360                                                FLOW_DISSECTOR_KEY_ENC_PORTS,
 361                                                target_container);
 362                 tp->src = key->tp_src;
 363                 tp->dst = key->tp_dst;
 364         }
 365
 366         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_IP)) {
 367                 struct flow_dissector_key_ip *ip;
 368
 369                 ip = skb_flow_dissector_target(flow_dissector,
 370                                                FLOW_DISSECTOR_KEY_ENC_IP,
 371                                                target_container);
 372                 ip->tos = key->tos;
 373                 ip->ttl = key->ttl;
 374         }
 375
 376         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_OPTS)) {
 377                 struct flow_dissector_key_enc_opts *enc_opt;
 378
 379                 enc_opt = skb_flow_dissector_target(flow_dissector,
 380                                                     FLOW_DISSECTOR_KEY_ENC_OPTS,
 381                                                     target_container);
 382
 383                 if (info->options_len) {
 384                         enc_opt->len = info->options_len;
 385                         ip_tunnel_info_opts_get(enc_opt->data, info);
 386                         enc_opt->dst_opt_type = info->key.tun_flags &
 387                                                 TUNNEL_OPTIONS_PRESENT;
 388                 }
 389         }
 390 }
 391 EXPORT_SYMBOL(skb_flow_dissect_tunnel_info);
 392
 393 void skb_flow_dissect_hash(const struct sk_buff *skb,
 394                            struct flow_dissector *flow_dissector,
 395                            void *target_container)
 396 {
 397         struct flow_dissector_key_hash *key;
 398
 399         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_HASH))
 400                 return;
 401
 402         key = skb_flow_dissector_target(flow_dissector,
 403                                         FLOW_DISSECTOR_KEY_HASH,
 404                                         target_container);
 405
 406         key->hash = skb_get_hash_raw(skb);
 407 }
 408 EXPORT_SYMBOL(skb_flow_dissect_hash);
 409
 410 static enum flow_dissect_ret
 411 __skb_flow_dissect_mpls(const struct sk_buff *skb,
 412                         struct flow_dissector *flow_dissector,
 413                         void *target_container, const void *data, int nhoff,
 414                         int hlen, int lse_index, bool *entropy_label)
 415 {
 416         struct mpls_label *hdr, _hdr;
 417         u32 entry, label, bos;
 418
 419         if (!dissector_uses_key(flow_dissector,
 420                                 FLOW_DISSECTOR_KEY_MPLS_ENTROPY) &&
 421             !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS))
 422                 return FLOW_DISSECT_RET_OUT_GOOD;
 423
 424         if (lse_index >= FLOW_DIS_MPLS_MAX)
 425                 return FLOW_DISSECT_RET_OUT_GOOD;
 426
 427         hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
 428                                    hlen, &_hdr);
 429         if (!hdr)
 430                 return FLOW_DISSECT_RET_OUT_BAD;
 431
 432         entry = ntohl(hdr->entry);
 433         label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
 434         bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
 435
 436         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) {
 437                 struct flow_dissector_key_mpls *key_mpls;
 438                 struct flow_dissector_mpls_lse *lse;
 439
 440                 key_mpls = skb_flow_dissector_target(flow_dissector,
 441                                                      FLOW_DISSECTOR_KEY_MPLS,
 442                                                      target_container);
 443                 lse = &key_mpls->ls[lse_index];
 444
 445                 lse->mpls_ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
 446                 lse->mpls_bos = bos;
 447                 lse->mpls_tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
 448                 lse->mpls_label = label;
 449                 dissector_set_mpls_lse(key_mpls, lse_index);
 450         }
 451
 452         if (*entropy_label &&
 453             dissector_uses_key(flow_dissector,
 454                                FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) {
 455                 struct flow_dissector_key_keyid *key_keyid;
 456
 457                 key_keyid = skb_flow_dissector_target(flow_dissector,
 458                                                       FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
 459                                                       target_container);
 460                 key_keyid->keyid = cpu_to_be32(label);
 461         }
 462
 463         *entropy_label = label == MPLS_LABEL_ENTROPY;
 464
 465         return bos ? FLOW_DISSECT_RET_OUT_GOOD : FLOW_DISSECT_RET_PROTO_AGAIN;
 466 }
 467
 468 static enum flow_dissect_ret
 469 __skb_flow_dissect_arp(const struct sk_buff *skb,
 470                        struct flow_dissector *flow_dissector,
 471                        void *target_container, const void *data,
 472                        int nhoff, int hlen)
 473 {
 474         struct flow_dissector_key_arp *key_arp;
 475         struct {
 476                 unsigned char ar_sha[ETH_ALEN];
 477                 unsigned char ar_sip[4];
 478                 unsigned char ar_tha[ETH_ALEN];
 479                 unsigned char ar_tip[4];
 480         } *arp_eth, _arp_eth;
 481         const struct arphdr *arp;
 482         struct arphdr _arp;
 483
 484         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP))
 485                 return FLOW_DISSECT_RET_OUT_GOOD;
 486
 487         arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
 488                                    hlen, &_arp);
 489         if (!arp)
 490                 return FLOW_DISSECT_RET_OUT_BAD;
 491
 492         if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
 493             arp->ar_pro != htons(ETH_P_IP) ||
 494             arp->ar_hln != ETH_ALEN ||
 495             arp->ar_pln != 4 ||
 496             (arp->ar_op != htons(ARPOP_REPLY) &&
 497              arp->ar_op != htons(ARPOP_REQUEST)))
 498                 return FLOW_DISSECT_RET_OUT_BAD;
 499
 500         arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
 501                                        sizeof(_arp_eth), data,
 502                                        hlen, &_arp_eth);
 503         if (!arp_eth)
 504                 return FLOW_DISSECT_RET_OUT_BAD;
 505
 506         key_arp = skb_flow_dissector_target(flow_dissector,
 507                                             FLOW_DISSECTOR_KEY_ARP,
 508                                             target_container);
 509
 510         memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip));
 511         memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip));
 512
 513         /* Only store the lower byte of the opcode;
 514          * this covers ARPOP_REPLY and ARPOP_REQUEST.
 515          */
 516         key_arp->op = ntohs(arp->ar_op) & 0xff;
 517
 518         ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
 519         ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
 520
 521         return FLOW_DISSECT_RET_OUT_GOOD;
 522 }
 523
 524 static enum flow_dissect_ret
 525 __skb_flow_dissect_gre(const struct sk_buff *skb,
 526                        struct flow_dissector_key_control *key_control,
 527                        struct flow_dissector *flow_dissector,
 528                        void *target_container, const void *data,
 529                        __be16 *p_proto, int *p_nhoff, int *p_hlen,
 530                        unsigned int flags)
 531 {
 532         struct flow_dissector_key_keyid *key_keyid;
 533         struct gre_base_hdr *hdr, _hdr;
 534         int offset = 0;
 535         u16 gre_ver;
 536
 537         hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr),
 538                                    data, *p_hlen, &_hdr);
 539         if (!hdr)
 540                 return FLOW_DISSECT_RET_OUT_BAD;
 541
 542         /* Only look inside GRE without routing */
 543         if (hdr->flags & GRE_ROUTING)
 544                 return FLOW_DISSECT_RET_OUT_GOOD;
 545
 546         /* Only look inside GRE for version 0 and 1 */
 547         gre_ver = ntohs(hdr->flags & GRE_VERSION);
 548         if (gre_ver > 1)
 549                 return FLOW_DISSECT_RET_OUT_GOOD;
 550
 551         *p_proto = hdr->protocol;
 552         if (gre_ver) {
 553                 /* Version1 must be PPTP, and check the flags */
 554                 if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
 555                         return FLOW_DISSECT_RET_OUT_GOOD;
 556         }
 557
 558         offset += sizeof(struct gre_base_hdr);
 559
 560         if (hdr->flags & GRE_CSUM)
 561                 offset += sizeof_field(struct gre_full_hdr, csum) +
 562                           sizeof_field(struct gre_full_hdr, reserved1);
 563
 564         if (hdr->flags & GRE_KEY) {
 565                 const __be32 *keyid;
 566                 __be32 _keyid;
 567
 568                 keyid = __skb_header_pointer(skb, *p_nhoff + offset,
 569                                              sizeof(_keyid),
 570                                              data, *p_hlen, &_keyid);
 571                 if (!keyid)
 572                         return FLOW_DISSECT_RET_OUT_BAD;
 573
 574                 if (dissector_uses_key(flow_dissector,
 575                                        FLOW_DISSECTOR_KEY_GRE_KEYID)) {
 576                         key_keyid = skb_flow_dissector_target(flow_dissector,
 577                                                               FLOW_DISSECTOR_KEY_GRE_KEYID,
 578                                                               target_container);
 579                         if (gre_ver == 0)
 580                                 key_keyid->keyid = *keyid;
 581                         else
 582                                 key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
 583                 }
 584                 offset += sizeof_field(struct gre_full_hdr, key);
 585         }
 586
 587         if (hdr->flags & GRE_SEQ)
 588                 offset += sizeof_field(struct pptp_gre_header, seq);
 589
 590         if (gre_ver == 0) {
 591                 if (*p_proto == htons(ETH_P_TEB)) {
 592                         const struct ethhdr *eth;
 593                         struct ethhdr _eth;
 594
 595                         eth = __skb_header_pointer(skb, *p_nhoff + offset,
 596                                                    sizeof(_eth),
 597                                                    data, *p_hlen, &_eth);
 598                         if (!eth)
 599                                 return FLOW_DISSECT_RET_OUT_BAD;
 600                         *p_proto = eth->h_proto;
 601                         offset += sizeof(*eth);
 602
 603                         /* Cap headers that we access via pointers at the
 604                          * end of the Ethernet header as our maximum alignment
 605                          * at that point is only 2 bytes.
 606                          */
 607                         if (NET_IP_ALIGN)
 608                                 *p_hlen = *p_nhoff + offset;
 609                 }
 610         } else { /* version 1, must be PPTP */
 611                 u8 _ppp_hdr[PPP_HDRLEN];
 612                 u8 *ppp_hdr;
 613
 614                 if (hdr->flags & GRE_ACK)
 615                         offset += sizeof_field(struct pptp_gre_header, ack);
 616
 617                 ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset,
 618                                                sizeof(_ppp_hdr),
 619                                                data, *p_hlen, _ppp_hdr);
 620                 if (!ppp_hdr)
 621                         return FLOW_DISSECT_RET_OUT_BAD;
 622
 623                 switch (PPP_PROTOCOL(ppp_hdr)) {
 624                 case PPP_IP:
 625                         *p_proto = htons(ETH_P_IP);
 626                         break;
 627                 case PPP_IPV6:
 628                         *p_proto = htons(ETH_P_IPV6);
 629                         break;
 630                 default:
 631                         /* Could probably catch some more like MPLS */
 632                         break;
 633                 }
 634
 635                 offset += PPP_HDRLEN;
 636         }
 637
 638         *p_nhoff += offset;
 639         key_control->flags |= FLOW_DIS_ENCAPSULATION;
 640         if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 641                 return FLOW_DISSECT_RET_OUT_GOOD;
 642
 643         return FLOW_DISSECT_RET_PROTO_AGAIN;
 644 }
 645
 646 /**
 647  * __skb_flow_dissect_batadv() - dissect batman-adv header
 648  * @skb: sk_buff to with the batman-adv header
 649  * @key_control: flow dissectors control key
 650  * @data: raw buffer pointer to the packet, if NULL use skb->data
 651  * @p_proto: pointer used to update the protocol to process next
 652  * @p_nhoff: pointer used to update inner network header offset
 653  * @hlen: packet header length
 654  * @flags: any combination of FLOW_DISSECTOR_F_*
 655  *
 656  * ETH_P_BATMAN packets are tried to be dissected. Only
 657  * &struct batadv_unicast packets are actually processed because they contain an
 658  * inner ethernet header and are usually followed by actual network header. This
 659  * allows the flow dissector to continue processing the packet.
 660  *
 661  * Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found,
 662  *  FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation,
 663  *  otherwise FLOW_DISSECT_RET_OUT_BAD
 664  */
 665 static enum flow_dissect_ret
 666 __skb_flow_dissect_batadv(const struct sk_buff *skb,
 667                           struct flow_dissector_key_control *key_control,
 668                           const void *data, __be16 *p_proto, int *p_nhoff,
 669                           int hlen, unsigned int flags)
 670 {
 671         struct {
 672                 struct batadv_unicast_packet batadv_unicast;
 673                 struct ethhdr eth;
 674         } *hdr, _hdr;
 675
 676         hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen,
 677                                    &_hdr);
 678         if (!hdr)
 679                 return FLOW_DISSECT_RET_OUT_BAD;
 680
 681         if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION)
 682                 return FLOW_DISSECT_RET_OUT_BAD;
 683
 684         if (hdr->batadv_unicast.packet_type != BATADV_UNICAST)
 685                 return FLOW_DISSECT_RET_OUT_BAD;
 686
 687         *p_proto = hdr->eth.h_proto;
 688         *p_nhoff += sizeof(*hdr);
 689
 690         key_control->flags |= FLOW_DIS_ENCAPSULATION;
 691         if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 692                 return FLOW_DISSECT_RET_OUT_GOOD;
 693
 694         return FLOW_DISSECT_RET_PROTO_AGAIN;
 695 }
 696
 697 static void
 698 __skb_flow_dissect_tcp(const struct sk_buff *skb,
 699                        struct flow_dissector *flow_dissector,
 700                        void *target_container, const void *data,
 701                        int thoff, int hlen)
 702 {
 703         struct flow_dissector_key_tcp *key_tcp;
 704         struct tcphdr *th, _th;
 705
 706         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
 707                 return;
 708
 709         th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
 710         if (!th)
 711                 return;
 712
 713         if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
 714                 return;
 715
 716         key_tcp = skb_flow_dissector_target(flow_dissector,
 717                                             FLOW_DISSECTOR_KEY_TCP,
 718                                             target_container);
 719         key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
 720 }
 721
 722 static void
 723 __skb_flow_dissect_ports(const struct sk_buff *skb,
 724                          struct flow_dissector *flow_dissector,
 725                          void *target_container, const void *data,
 726                          int nhoff, u8 ip_proto, int hlen)
 727 {
 728         enum flow_dissector_key_id dissector_ports = FLOW_DISSECTOR_KEY_MAX;
 729         struct flow_dissector_key_ports *key_ports;
 730
 731         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
 732                 dissector_ports = FLOW_DISSECTOR_KEY_PORTS;
 733         else if (dissector_uses_key(flow_dissector,
 734                                     FLOW_DISSECTOR_KEY_PORTS_RANGE))
 735                 dissector_ports = FLOW_DISSECTOR_KEY_PORTS_RANGE;
 736
 737         if (dissector_ports == FLOW_DISSECTOR_KEY_MAX)
 738                 return;
 739
 740         key_ports = skb_flow_dissector_target(flow_dissector,
 741                                               dissector_ports,
 742                                               target_container);
 743         key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
 744                                                 data, hlen);
 745 }
 746
 747 static void
 748 __skb_flow_dissect_ipv4(const struct sk_buff *skb,
 749                         struct flow_dissector *flow_dissector,
 750                         void *target_container, const void *data,
 751                         const struct iphdr *iph)
 752 {
 753         struct flow_dissector_key_ip *key_ip;
 754
 755         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
 756                 return;
 757
 758         key_ip = skb_flow_dissector_target(flow_dissector,
 759                                            FLOW_DISSECTOR_KEY_IP,
 760                                            target_container);
 761         key_ip->tos = iph->tos;
 762         key_ip->ttl = iph->ttl;
 763 }
 764
 765 static void
 766 __skb_flow_dissect_ipv6(const struct sk_buff *skb,
 767                         struct flow_dissector *flow_dissector,
 768                         void *target_container, const void *data,
 769                         const struct ipv6hdr *iph)
 770 {
 771         struct flow_dissector_key_ip *key_ip;
 772
 773         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
 774                 return;
 775
 776         key_ip = skb_flow_dissector_target(flow_dissector,
 777                                            FLOW_DISSECTOR_KEY_IP,
 778                                            target_container);
 779         key_ip->tos = ipv6_get_dsfield(iph);
 780         key_ip->ttl = iph->hop_limit;
 781 }
 782
 783 /* Maximum number of protocol headers that can be parsed in
 784  * __skb_flow_dissect
 785  */
 786 #define MAX_FLOW_DISSECT_HDRS   15
 787
 788 static bool skb_flow_dissect_allowed(int *num_hdrs)
 789 {
 790         ++*num_hdrs;
 791
 792         return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS);
 793 }
 794
 795 static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
 796                                      struct flow_dissector *flow_dissector,
 797                                      void *target_container)
 798 {
 799         struct flow_dissector_key_ports *key_ports = NULL;
 800         struct flow_dissector_key_control *key_control;
 801         struct flow_dissector_key_basic *key_basic;
 802         struct flow_dissector_key_addrs *key_addrs;
 803         struct flow_dissector_key_tags *key_tags;
 804
 805         key_control = skb_flow_dissector_target(flow_dissector,
 806                                                 FLOW_DISSECTOR_KEY_CONTROL,
 807                                                 target_container);
 808         key_control->thoff = flow_keys->thoff;
 809         if (flow_keys->is_frag)
 810                 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
 811         if (flow_keys->is_first_frag)
 812                 key_control->flags |= FLOW_DIS_FIRST_FRAG;
 813         if (flow_keys->is_encap)
 814                 key_control->flags |= FLOW_DIS_ENCAPSULATION;
 815
 816         key_basic = skb_flow_dissector_target(flow_dissector,
 817                                               FLOW_DISSECTOR_KEY_BASIC,
 818                                               target_container);
 819         key_basic->n_proto = flow_keys->n_proto;
 820         key_basic->ip_proto = flow_keys->ip_proto;
 821
 822         if (flow_keys->addr_proto == ETH_P_IP &&
 823             dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
 824                 key_addrs = skb_flow_dissector_target(flow_dissector,
 825                                                       FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 826                                                       target_container);
 827                 key_addrs->v4addrs.src = flow_keys->ipv4_src;
 828                 key_addrs->v4addrs.dst = flow_keys->ipv4_dst;
 829                 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 830         } else if (flow_keys->addr_proto == ETH_P_IPV6 &&
 831                    dissector_uses_key(flow_dissector,
 832                                       FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
 833                 key_addrs = skb_flow_dissector_target(flow_dissector,
 834                                                       FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 835                                                       target_container);
 836                 memcpy(&key_addrs->v6addrs.src, &flow_keys->ipv6_src,
 837                        sizeof(key_addrs->v6addrs.src));
 838                 memcpy(&key_addrs->v6addrs.dst, &flow_keys->ipv6_dst,
 839                        sizeof(key_addrs->v6addrs.dst));
 840                 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 841         }
 842
 843         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
 844                 key_ports = skb_flow_dissector_target(flow_dissector,
 845                                                       FLOW_DISSECTOR_KEY_PORTS,
 846                                                       target_container);
 847         else if (dissector_uses_key(flow_dissector,
 848                                     FLOW_DISSECTOR_KEY_PORTS_RANGE))
 849                 key_ports = skb_flow_dissector_target(flow_dissector,
 850                                                       FLOW_DISSECTOR_KEY_PORTS_RANGE,
 851                                                       target_container);
 852
 853         if (key_ports) {
 854                 key_ports->src = flow_keys->sport;
 855                 key_ports->dst = flow_keys->dport;
 856         }
 857
 858         if (dissector_uses_key(flow_dissector,
 859                                FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
 860                 key_tags = skb_flow_dissector_target(flow_dissector,
 861                                                      FLOW_DISSECTOR_KEY_FLOW_LABEL,
 862                                                      target_container);
 863                 key_tags->flow_label = ntohl(flow_keys->flow_label);
 864         }
 865 }
 866
 867 bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
 868                       __be16 proto, int nhoff, int hlen, unsigned int flags)
 869 {
 870         struct bpf_flow_keys *flow_keys = ctx->flow_keys;
 871         u32 result;
 872
 873         /* Pass parameters to the BPF program */
 874         memset(flow_keys, 0, sizeof(*flow_keys));
 875         flow_keys->n_proto = proto;
 876         flow_keys->nhoff = nhoff;
 877         flow_keys->thoff = flow_keys->nhoff;
 878
 879         BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG !=
 880                      (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG);
 881         BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL !=
 882                      (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
 883         BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP !=
 884                      (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP);
 885         flow_keys->flags = flags;
 886
 887         result = bpf_prog_run_pin_on_cpu(prog, ctx);
 888
 889         flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen);
 890         flow_keys->thoff = clamp_t(u16, flow_keys->thoff,
 891                                    flow_keys->nhoff, hlen);
 892
 893         return result == BPF_OK;
 894 }
 895
 896 /**
 897  * __skb_flow_dissect - extract the flow_keys struct and return it
 898  * @net: associated network namespace, derived from @skb if NULL
 899  * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
 900  * @flow_dissector: list of keys to dissect
 901  * @target_container: target structure to put dissected values into
 902  * @data: raw buffer pointer to the packet, if NULL use skb->data
 903  * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
 904  * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
 905  * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
 906  * @flags: flags that control the dissection process, e.g.
 907  *         FLOW_DISSECTOR_F_STOP_AT_ENCAP.
 908  *
 909  * The function will try to retrieve individual keys into target specified
 910  * by flow_dissector from either the skbuff or a raw buffer specified by the
 911  * rest parameters.
 912  *
 913  * Caller must take care of zeroing target container memory.
 914  */
 915 bool __skb_flow_dissect(const struct net *net,
 916                         const struct sk_buff *skb,
 917                         struct flow_dissector *flow_dissector,
 918                         void *target_container, const void *data,
 919                         __be16 proto, int nhoff, int hlen, unsigned int flags)
 920 {
 921         struct flow_dissector_key_control *key_control;
 922         struct flow_dissector_key_basic *key_basic;
 923         struct flow_dissector_key_addrs *key_addrs;
 924         struct flow_dissector_key_tags *key_tags;
 925         struct flow_dissector_key_vlan *key_vlan;
 926         enum flow_dissect_ret fdret;
 927         enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX;
 928         bool mpls_el = false;
 929         int mpls_lse = 0;
 930         int num_hdrs = 0;
 931         u8 ip_proto = 0;
 932         bool ret;
 933
 934         if (!data) {
 935                 data = skb->data;
 936                 proto = skb_vlan_tag_present(skb) ?
 937                          skb->vlan_proto : skb->protocol;
 938                 nhoff = skb_network_offset(skb);
 939                 hlen = skb_headlen(skb);
 940 #if IS_ENABLED(CONFIG_NET_DSA)
 941                 if (unlikely(skb->dev && netdev_uses_dsa(skb->dev) &&
 942                              proto == htons(ETH_P_XDSA))) {
 943                         const struct dsa_device_ops *ops;
 944                         int offset = 0;
 945
 946                         ops = skb->dev->dsa_ptr->tag_ops;
 947                         /* Only DSA header taggers break flow dissection */
 948                         if (ops->needed_headroom) {
 949                                 if (ops->flow_dissect)
 950                                         ops->flow_dissect(skb, &proto, &offset);
 951                                 else
 952                                         dsa_tag_generic_flow_dissect(skb,
 953                                                                      &proto,
 954                                                                      &offset);
 955                                 hlen -= offset;
 956                                 nhoff += offset;
 957                         }
 958                 }
 959 #endif
 960         }
 961
 962         /* It is ensured by skb_flow_dissector_init() that control key will
 963          * be always present.
 964          */
 965         key_control = skb_flow_dissector_target(flow_dissector,
 966                                                 FLOW_DISSECTOR_KEY_CONTROL,
 967                                                 target_container);
 968
 969         /* It is ensured by skb_flow_dissector_init() that basic key will
 970          * be always present.
 971          */
 972         key_basic = skb_flow_dissector_target(flow_dissector,
 973                                               FLOW_DISSECTOR_KEY_BASIC,
 974                                               target_container);
 975
 976         if (skb) {
 977                 if (!net) {
 978                         if (skb->dev)
 979                                 net = dev_net(skb->dev);
 980                         else if (skb->sk)
 981                                 net = sock_net(skb->sk);
 982                 }
 983         }
 984
 985         WARN_ON_ONCE(!net);
 986         if (net) {
 987                 enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR;
 988                 struct bpf_prog_array *run_array;
 989
 990                 rcu_read_lock();
 991                 run_array = rcu_dereference(init_net.bpf.run_array[type]);
 992                 if (!run_array)
 993                         run_array = rcu_dereference(net->bpf.run_array[type]);
 994
 995                 if (run_array) {
 996                         struct bpf_flow_keys flow_keys;
 997                         struct bpf_flow_dissector ctx = {
 998                                 .flow_keys = &flow_keys,
 999                                 .data = data,
1000                                 .data_end = data + hlen,
1001                         };
1002                         __be16 n_proto = proto;
1003                         struct bpf_prog *prog;
1004
1005                         if (skb) {
1006                                 ctx.skb = skb;
1007                                 /* we can't use 'proto' in the skb case
1008                                  * because it might be set to skb->vlan_proto
1009                                  * which has been pulled from the data
1010                                  */
1011                                 n_proto = skb->protocol;
1012                         }
1013
1014                         prog = READ_ONCE(run_array->items[0].prog);
1015                         ret = bpf_flow_dissect(prog, &ctx, n_proto, nhoff,
1016                                                hlen, flags);
1017                         __skb_flow_bpf_to_target(&flow_keys, flow_dissector,
1018                                                  target_container);
1019                         rcu_read_unlock();
1020                         return ret;
1021                 }
1022                 rcu_read_unlock();
1023         }
1024
1025         if (dissector_uses_key(flow_dissector,
1026                                FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
1027                 struct ethhdr *eth = eth_hdr(skb);
1028                 struct flow_dissector_key_eth_addrs *key_eth_addrs;
1029
1030                 key_eth_addrs = skb_flow_dissector_target(flow_dissector,
1031                                                           FLOW_DISSECTOR_KEY_ETH_ADDRS,
1032                                                           target_container);
1033                 memcpy(key_eth_addrs, &eth->h_dest, sizeof(*key_eth_addrs));
1034         }
1035
1036 proto_again:
1037         fdret = FLOW_DISSECT_RET_CONTINUE;
1038
1039         switch (proto) {
1040         case htons(ETH_P_IP): {
1041                 const struct iphdr *iph;
1042                 struct iphdr _iph;
1043
1044                 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
1045                 if (!iph || iph->ihl < 5) {
1046                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1047                         break;
1048                 }
1049
1050                 nhoff += iph->ihl * 4;
1051
1052                 ip_proto = iph->protocol;
1053
1054                 if (dissector_uses_key(flow_dissector,
1055                                        FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
1056                         key_addrs = skb_flow_dissector_target(flow_dissector,
1057                                                               FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1058                                                               target_container);
1059
1060                         memcpy(&key_addrs->v4addrs.src, &iph->saddr,
1061                                sizeof(key_addrs->v4addrs.src));
1062                         memcpy(&key_addrs->v4addrs.dst, &iph->daddr,
1063                                sizeof(key_addrs->v4addrs.dst));
1064                         key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
1065                 }
1066
1067                 __skb_flow_dissect_ipv4(skb, flow_dissector,
1068                                         target_container, data, iph);
1069
1070                 if (ip_is_fragment(iph)) {
1071                         key_control->flags |= FLOW_DIS_IS_FRAGMENT;
1072
1073                         if (iph->frag_off & htons(IP_OFFSET)) {
1074                                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1075                                 break;
1076                         } else {
1077                                 key_control->flags |= FLOW_DIS_FIRST_FRAG;
1078                                 if (!(flags &
1079                                       FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) {
1080                                         fdret = FLOW_DISSECT_RET_OUT_GOOD;
1081                                         break;
1082                                 }
1083                         }
1084                 }
1085
1086                 break;
1087         }
1088         case htons(ETH_P_IPV6): {
1089                 const struct ipv6hdr *iph;
1090                 struct ipv6hdr _iph;
1091
1092                 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
1093                 if (!iph) {
1094                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1095                         break;
1096                 }
1097
1098                 ip_proto = iph->nexthdr;
1099                 nhoff += sizeof(struct ipv6hdr);
1100
1101                 if (dissector_uses_key(flow_dissector,
1102                                        FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
1103                         key_addrs = skb_flow_dissector_target(flow_dissector,
1104                                                               FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1105                                                               target_container);
1106
1107                         memcpy(&key_addrs->v6addrs.src, &iph->saddr,
1108                                sizeof(key_addrs->v6addrs.src));
1109                         memcpy(&key_addrs->v6addrs.dst, &iph->daddr,
1110                                sizeof(key_addrs->v6addrs.dst));
1111                         key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1112                 }
1113
1114                 if ((dissector_uses_key(flow_dissector,
1115                                         FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
1116                      (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
1117                     ip6_flowlabel(iph)) {
1118                         __be32 flow_label = ip6_flowlabel(iph);
1119
1120                         if (dissector_uses_key(flow_dissector,
1121                                                FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
1122                                 key_tags = skb_flow_dissector_target(flow_dissector,
1123                                                                      FLOW_DISSECTOR_KEY_FLOW_LABEL,
1124                                                                      target_container);
1125                                 key_tags->flow_label = ntohl(flow_label);
1126                         }
1127                         if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) {
1128                                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1129                                 break;
1130                         }
1131                 }
1132
1133                 __skb_flow_dissect_ipv6(skb, flow_dissector,
1134                                         target_container, data, iph);
1135
1136                 break;
1137         }
1138         case htons(ETH_P_8021AD):
1139         case htons(ETH_P_8021Q): {
1140                 const struct vlan_hdr *vlan = NULL;
1141                 struct vlan_hdr _vlan;
1142                 __be16 saved_vlan_tpid = proto;
1143
1144                 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX &&
1145                     skb && skb_vlan_tag_present(skb)) {
1146                         proto = skb->protocol;
1147                 } else {
1148                         vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
1149                                                     data, hlen, &_vlan);
1150                         if (!vlan) {
1151                                 fdret = FLOW_DISSECT_RET_OUT_BAD;
1152                                 break;
1153                         }
1154
1155                         proto = vlan->h_vlan_encapsulated_proto;
1156                         nhoff += sizeof(*vlan);
1157                 }
1158
1159                 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) {
1160                         dissector_vlan = FLOW_DISSECTOR_KEY_VLAN;
1161                 } else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) {
1162                         dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN;
1163                 } else {
1164                         fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1165                         break;
1166                 }
1167
1168                 if (dissector_uses_key(flow_dissector, dissector_vlan)) {
1169                         key_vlan = skb_flow_dissector_target(flow_dissector,
1170                                                              dissector_vlan,
1171                                                              target_container);
1172
1173                         if (!vlan) {
1174                                 key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
1175                                 key_vlan->vlan_priority = skb_vlan_tag_get_prio(skb);
1176                         } else {
1177                                 key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
1178                                         VLAN_VID_MASK;
1179                                 key_vlan->vlan_priority =
1180                                         (ntohs(vlan->h_vlan_TCI) &
1181                                          VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
1182                         }
1183                         key_vlan->vlan_tpid = saved_vlan_tpid;
1184                         key_vlan->vlan_eth_type = proto;
1185                 }
1186
1187                 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1188                 break;
1189         }
1190         case htons(ETH_P_PPP_SES): {
1191                 struct {
1192                         struct pppoe_hdr hdr;
1193                         __be16 proto;
1194                 } *hdr, _hdr;
1195                 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
1196                 if (!hdr) {
1197                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1198                         break;
1199                 }
1200
1201                 proto = hdr->proto;
1202                 nhoff += PPPOE_SES_HLEN;
1203                 switch (proto) {
1204                 case htons(PPP_IP):
1205                         proto = htons(ETH_P_IP);
1206                         fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1207                         break;
1208                 case htons(PPP_IPV6):
1209                         proto = htons(ETH_P_IPV6);
1210                         fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1211                         break;
1212                 default:
1213                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1214                         break;
1215                 }
1216                 break;
1217         }
1218         case htons(ETH_P_TIPC): {
1219                 struct tipc_basic_hdr *hdr, _hdr;
1220
1221                 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr),
1222                                            data, hlen, &_hdr);
1223                 if (!hdr) {
1224                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1225                         break;
1226                 }
1227
1228                 if (dissector_uses_key(flow_dissector,
1229                                        FLOW_DISSECTOR_KEY_TIPC)) {
1230                         key_addrs = skb_flow_dissector_target(flow_dissector,
1231                                                               FLOW_DISSECTOR_KEY_TIPC,
1232                                                               target_container);
1233                         key_addrs->tipckey.key = tipc_hdr_rps_key(hdr);
1234                         key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC;
1235                 }
1236                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1237                 break;
1238         }
1239
1240         case htons(ETH_P_MPLS_UC):
1241         case htons(ETH_P_MPLS_MC):
1242                 fdret = __skb_flow_dissect_mpls(skb, flow_dissector,
1243                                                 target_container, data,
1244                                                 nhoff, hlen, mpls_lse,
1245                                                 &mpls_el);
1246                 nhoff += sizeof(struct mpls_label);
1247                 mpls_lse++;
1248                 break;
1249         case htons(ETH_P_FCOE):
1250                 if ((hlen - nhoff) < FCOE_HEADER_LEN) {
1251                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1252                         break;
1253                 }
1254
1255                 nhoff += FCOE_HEADER_LEN;
1256                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1257                 break;
1258
1259         case htons(ETH_P_ARP):
1260         case htons(ETH_P_RARP):
1261                 fdret = __skb_flow_dissect_arp(skb, flow_dissector,
1262                                                target_container, data,
1263                                                nhoff, hlen);
1264                 break;
1265
1266         case htons(ETH_P_BATMAN):
1267                 fdret = __skb_flow_dissect_batadv(skb, key_control, data,
1268                                                   &proto, &nhoff, hlen, flags);
1269                 break;
1270
1271         case htons(ETH_P_1588): {
1272                 struct ptp_header *hdr, _hdr;
1273
1274                 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
1275                                            hlen, &_hdr);
1276                 if (!hdr) {
1277                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1278                         break;
1279                 }
1280
1281                 nhoff += ntohs(hdr->message_length);
1282                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1283                 break;
1284         }
1285
1286         default:
1287                 fdret = FLOW_DISSECT_RET_OUT_BAD;
1288                 break;
1289         }
1290
1291         /* Process result of proto processing */
1292         switch (fdret) {
1293         case FLOW_DISSECT_RET_OUT_GOOD:
1294                 goto out_good;
1295         case FLOW_DISSECT_RET_PROTO_AGAIN:
1296                 if (skb_flow_dissect_allowed(&num_hdrs))
1297                         goto proto_again;
1298                 goto out_good;
1299         case FLOW_DISSECT_RET_CONTINUE:
1300         case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1301                 break;
1302         case FLOW_DISSECT_RET_OUT_BAD:
1303         default:
1304                 goto out_bad;
1305         }
1306
1307 ip_proto_again:
1308         fdret = FLOW_DISSECT_RET_CONTINUE;
1309
1310         switch (ip_proto) {
1311         case IPPROTO_GRE:
1312                 fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector,
1313                                                target_container, data,
1314                                                &proto, &nhoff, &hlen, flags);
1315                 break;
1316
1317         case NEXTHDR_HOP:
1318         case NEXTHDR_ROUTING:
1319         case NEXTHDR_DEST: {
1320                 u8 _opthdr[2], *opthdr;
1321
1322                 if (proto != htons(ETH_P_IPV6))
1323                         break;
1324
1325                 opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
1326                                               data, hlen, &_opthdr);
1327                 if (!opthdr) {
1328                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1329                         break;
1330                 }
1331
1332                 ip_proto = opthdr[0];
1333                 nhoff += (opthdr[1] + 1) << 3;
1334
1335                 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1336                 break;
1337         }
1338         case NEXTHDR_FRAGMENT: {
1339                 struct frag_hdr _fh, *fh;
1340
1341                 if (proto != htons(ETH_P_IPV6))
1342                         break;
1343
1344                 fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
1345                                           data, hlen, &_fh);
1346
1347                 if (!fh) {
1348                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1349                         break;
1350                 }
1351
1352                 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
1353
1354                 nhoff += sizeof(_fh);
1355                 ip_proto = fh->nexthdr;
1356
1357                 if (!(fh->frag_off & htons(IP6_OFFSET))) {
1358                         key_control->flags |= FLOW_DIS_FIRST_FRAG;
1359                         if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
1360                                 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1361                                 break;
1362                         }
1363                 }
1364
1365                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1366                 break;
1367         }
1368         case IPPROTO_IPIP:
1369                 proto = htons(ETH_P_IP);
1370
1371                 key_control->flags |= FLOW_DIS_ENCAPSULATION;
1372                 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1373                         fdret = FLOW_DISSECT_RET_OUT_GOOD;
1374                         break;
1375                 }
1376
1377                 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1378                 break;
1379
1380         case IPPROTO_IPV6:
1381                 proto = htons(ETH_P_IPV6);
1382
1383                 key_control->flags |= FLOW_DIS_ENCAPSULATION;
1384                 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1385                         fdret = FLOW_DISSECT_RET_OUT_GOOD;
1386                         break;
1387                 }
1388
1389                 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1390                 break;
1391
1392
1393         case IPPROTO_MPLS:
1394                 proto = htons(ETH_P_MPLS_UC);
1395                 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1396                 break;
1397
1398         case IPPROTO_TCP:
1399                 __skb_flow_dissect_tcp(skb, flow_dissector, target_container,
1400                                        data, nhoff, hlen);
1401                 break;
1402
1403         case IPPROTO_ICMP:
1404         case IPPROTO_ICMPV6:
1405                 __skb_flow_dissect_icmp(skb, flow_dissector, target_container,
1406                                         data, nhoff, hlen);
1407                 break;
1408
1409         default:
1410                 break;
1411         }
1412
1413         if (!(key_control->flags & FLOW_DIS_IS_FRAGMENT))
1414                 __skb_flow_dissect_ports(skb, flow_dissector, target_container,
1415                                          data, nhoff, ip_proto, hlen);
1416
1417         /* Process result of IP proto processing */
1418         switch (fdret) {
1419         case FLOW_DISSECT_RET_PROTO_AGAIN:
1420                 if (skb_flow_dissect_allowed(&num_hdrs))
1421                         goto proto_again;
1422                 break;
1423         case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1424                 if (skb_flow_dissect_allowed(&num_hdrs))
1425                         goto ip_proto_again;
1426                 break;
1427         case FLOW_DISSECT_RET_OUT_GOOD:
1428         case FLOW_DISSECT_RET_CONTINUE:
1429                 break;
1430         case FLOW_DISSECT_RET_OUT_BAD:
1431         default:
1432                 goto out_bad;
1433         }
1434
1435 out_good:
1436         ret = true;
1437
1438 out:
1439         key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
1440         key_basic->n_proto = proto;
1441         key_basic->ip_proto = ip_proto;
1442
1443         return ret;
1444
1445 out_bad:
1446         ret = false;
1447         goto out;
1448 }
1449 EXPORT_SYMBOL(__skb_flow_dissect);
1450
1451 static siphash_key_t hashrnd __read_mostly;
1452 static __always_inline void __flow_hash_secret_init(void)
1453 {
1454         net_get_random_once(&hashrnd, sizeof(hashrnd));
1455 }
1456
1457 static const void *flow_keys_hash_start(const struct flow_keys *flow)
1458 {
1459         BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % SIPHASH_ALIGNMENT);
1460         return &flow->FLOW_KEYS_HASH_START_FIELD;
1461 }
1462
1463 static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
1464 {
1465         size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
1466
1467         BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
1468
1469         switch (flow->control.addr_type) {
1470         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1471                 diff -= sizeof(flow->addrs.v4addrs);
1472                 break;
1473         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1474                 diff -= sizeof(flow->addrs.v6addrs);
1475                 break;
1476         case FLOW_DISSECTOR_KEY_TIPC:
1477                 diff -= sizeof(flow->addrs.tipckey);
1478                 break;
1479         }
1480         return sizeof(*flow) - diff;
1481 }
1482
1483 __be32 flow_get_u32_src(const struct flow_keys *flow)
1484 {
1485         switch (flow->control.addr_type) {
1486         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1487                 return flow->addrs.v4addrs.src;
1488         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1489                 return (__force __be32)ipv6_addr_hash(
1490                         &flow->addrs.v6addrs.src);
1491         case FLOW_DISSECTOR_KEY_TIPC:
1492                 return flow->addrs.tipckey.key;
1493         default:
1494                 return 0;
1495         }
1496 }
1497 EXPORT_SYMBOL(flow_get_u32_src);
1498
1499 __be32 flow_get_u32_dst(const struct flow_keys *flow)
1500 {
1501         switch (flow->control.addr_type) {
1502         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1503                 return flow->addrs.v4addrs.dst;
1504         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1505                 return (__force __be32)ipv6_addr_hash(
1506                         &flow->addrs.v6addrs.dst);
1507         default:
1508                 return 0;
1509         }
1510 }
1511 EXPORT_SYMBOL(flow_get_u32_dst);
1512
1513 /* Sort the source and destination IP and the ports,
1514  * to have consistent hash within the two directions
1515  */
1516 static inline void __flow_hash_consistentify(struct flow_keys *keys)
1517 {
1518         int addr_diff, i;
1519
1520         switch (keys->control.addr_type) {
1521         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1522                 addr_diff = (__force u32)keys->addrs.v4addrs.dst -
1523                             (__force u32)keys->addrs.v4addrs.src;
1524                 if (addr_diff < 0)
1525                         swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
1526
1527                 if ((__force u16)keys->ports.dst <
1528                     (__force u16)keys->ports.src) {
1529                         swap(keys->ports.src, keys->ports.dst);
1530                 }
1531                 break;
1532         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1533                 addr_diff = memcmp(&keys->addrs.v6addrs.dst,
1534                                    &keys->addrs.v6addrs.src,
1535                                    sizeof(keys->addrs.v6addrs.dst));
1536                 if (addr_diff < 0) {
1537                         for (i = 0; i < 4; i++)
1538                                 swap(keys->addrs.v6addrs.src.s6_addr32[i],
1539                                      keys->addrs.v6addrs.dst.s6_addr32[i]);
1540                 }
1541                 if ((__force u16)keys->ports.dst <
1542                     (__force u16)keys->ports.src) {
1543                         swap(keys->ports.src, keys->ports.dst);
1544                 }
1545                 break;
1546         }
1547 }
1548
1549 static inline u32 __flow_hash_from_keys(struct flow_keys *keys,
1550                                         const siphash_key_t *keyval)
1551 {
1552         u32 hash;
1553
1554         __flow_hash_consistentify(keys);
1555
1556         hash = siphash(flow_keys_hash_start(keys),
1557                        flow_keys_hash_length(keys), keyval);
1558         if (!hash)
1559                 hash = 1;
1560
1561         return hash;
1562 }
1563
1564 u32 flow_hash_from_keys(struct flow_keys *keys)
1565 {
1566         __flow_hash_secret_init();
1567         return __flow_hash_from_keys(keys, &hashrnd);
1568 }
1569 EXPORT_SYMBOL(flow_hash_from_keys);
1570
1571 static inline u32 ___skb_get_hash(const struct sk_buff *skb,
1572                                   struct flow_keys *keys,
1573                                   const siphash_key_t *keyval)
1574 {
1575         skb_flow_dissect_flow_keys(skb, keys,
1576                                    FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1577
1578         return __flow_hash_from_keys(keys, keyval);
1579 }
1580
1581 struct _flow_keys_digest_data {
1582         __be16  n_proto;
1583         u8      ip_proto;
1584         u8      padding;
1585         __be32  ports;
1586         __be32  src;
1587         __be32  dst;
1588 };
1589
1590 void make_flow_keys_digest(struct flow_keys_digest *digest,
1591                            const struct flow_keys *flow)
1592 {
1593         struct _flow_keys_digest_data *data =
1594             (struct _flow_keys_digest_data *)digest;
1595
1596         BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
1597
1598         memset(digest, 0, sizeof(*digest));
1599
1600         data->n_proto = flow->basic.n_proto;
1601         data->ip_proto = flow->basic.ip_proto;
1602         data->ports = flow->ports.ports;
1603         data->src = flow->addrs.v4addrs.src;
1604         data->dst = flow->addrs.v4addrs.dst;
1605 }
1606 EXPORT_SYMBOL(make_flow_keys_digest);
1607
1608 static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
1609
1610 u32 __skb_get_hash_symmetric(const struct sk_buff *skb)
1611 {
1612         struct flow_keys keys;
1613
1614         __flow_hash_secret_init();
1615
1616         memset(&keys, 0, sizeof(keys));
1617         __skb_flow_dissect(NULL, skb, &flow_keys_dissector_symmetric,
1618                            &keys, NULL, 0, 0, 0,
1619                            FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1620
1621         return __flow_hash_from_keys(&keys, &hashrnd);
1622 }
1623 EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
1624
1625 /**
1626  * __skb_get_hash: calculate a flow hash
1627  * @skb: sk_buff to calculate flow hash from
1628  *
1629  * This function calculates a flow hash based on src/dst addresses
1630  * and src/dst port numbers.  Sets hash in skb to non-zero hash value
1631  * on success, zero indicates no valid hash.  Also, sets l4_hash in skb
1632  * if hash is a canonical 4-tuple hash over transport ports.
1633  */
1634 void __skb_get_hash(struct sk_buff *skb)
1635 {
1636         struct flow_keys keys;
1637         u32 hash;
1638
1639         __flow_hash_secret_init();
1640
1641         hash = ___skb_get_hash(skb, &keys, &hashrnd);
1642
1643         __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
1644 }
1645 EXPORT_SYMBOL(__skb_get_hash);
1646
1647 __u32 skb_get_hash_perturb(const struct sk_buff *skb,
1648                            const siphash_key_t *perturb)
1649 {
1650         struct flow_keys keys;
1651
1652         return ___skb_get_hash(skb, &keys, perturb);
1653 }
1654 EXPORT_SYMBOL(skb_get_hash_perturb);
1655
1656 u32 __skb_get_poff(const struct sk_buff *skb, const void *data,
1657                    const struct flow_keys_basic *keys, int hlen)
1658 {
1659         u32 poff = keys->control.thoff;
1660
1661         /* skip L4 headers for fragments after the first */
1662         if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
1663             !(keys->control.flags & FLOW_DIS_FIRST_FRAG))
1664                 return poff;
1665
1666         switch (keys->basic.ip_proto) {
1667         case IPPROTO_TCP: {
1668                 /* access doff as u8 to avoid unaligned access */
1669                 const u8 *doff;
1670                 u8 _doff;
1671
1672                 doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
1673                                             data, hlen, &_doff);
1674                 if (!doff)
1675                         return poff;
1676
1677                 poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
1678                 break;
1679         }
1680         case IPPROTO_UDP:
1681         case IPPROTO_UDPLITE:
1682                 poff += sizeof(struct udphdr);
1683                 break;
1684         /* For the rest, we do not really care about header
1685          * extensions at this point for now.
1686          */
1687         case IPPROTO_ICMP:
1688                 poff += sizeof(struct icmphdr);
1689                 break;
1690         case IPPROTO_ICMPV6:
1691                 poff += sizeof(struct icmp6hdr);
1692                 break;
1693         case IPPROTO_IGMP:
1694                 poff += sizeof(struct igmphdr);
1695                 break;
1696         case IPPROTO_DCCP:
1697                 poff += sizeof(struct dccp_hdr);
1698                 break;
1699         case IPPROTO_SCTP:
1700                 poff += sizeof(struct sctphdr);
1701                 break;
1702         }
1703
1704         return poff;
1705 }
1706
1707 /**
1708  * skb_get_poff - get the offset to the payload
1709  * @skb: sk_buff to get the payload offset from
1710  *
1711  * The function will get the offset to the payload as far as it could
1712  * be dissected.  The main user is currently BPF, so that we can dynamically
1713  * truncate packets without needing to push actual payload to the user
1714  * space and can analyze headers only, instead.
1715  */
1716 u32 skb_get_poff(const struct sk_buff *skb)
1717 {
1718         struct flow_keys_basic keys;
1719
1720         if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
1721                                               NULL, 0, 0, 0, 0))
1722                 return 0;
1723
1724         return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
1725 }
1726
1727 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
1728 {
1729         memset(keys, 0, sizeof(*keys));
1730
1731         memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
1732             sizeof(keys->addrs.v6addrs.src));
1733         memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
1734             sizeof(keys->addrs.v6addrs.dst));
1735         keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1736         keys->ports.src = fl6->fl6_sport;
1737         keys->ports.dst = fl6->fl6_dport;
1738         keys->keyid.keyid = fl6->fl6_gre_key;
1739         keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
1740         keys->basic.ip_proto = fl6->flowi6_proto;
1741
1742         return flow_hash_from_keys(keys);
1743 }
1744 EXPORT_SYMBOL(__get_hash_from_flowi6);
1745
1746 static const struct flow_dissector_key flow_keys_dissector_keys[] = {
1747         {
1748                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1749                 .offset = offsetof(struct flow_keys, control),
1750         },
1751         {
1752                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1753                 .offset = offsetof(struct flow_keys, basic),
1754         },
1755         {
1756                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1757                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1758         },
1759         {
1760                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1761                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1762         },
1763         {
1764                 .key_id = FLOW_DISSECTOR_KEY_TIPC,
1765                 .offset = offsetof(struct flow_keys, addrs.tipckey),
1766         },
1767         {
1768                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1769                 .offset = offsetof(struct flow_keys, ports),
1770         },
1771         {
1772                 .key_id = FLOW_DISSECTOR_KEY_VLAN,
1773                 .offset = offsetof(struct flow_keys, vlan),
1774         },
1775         {
1776                 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
1777                 .offset = offsetof(struct flow_keys, tags),
1778         },
1779         {
1780                 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
1781                 .offset = offsetof(struct flow_keys, keyid),
1782         },
1783 };
1784
1785 static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
1786         {
1787                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1788                 .offset = offsetof(struct flow_keys, control),
1789         },
1790         {
1791                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1792                 .offset = offsetof(struct flow_keys, basic),
1793         },
1794         {
1795                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1796                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1797         },
1798         {
1799                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1800                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1801         },
1802         {
1803                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1804                 .offset = offsetof(struct flow_keys, ports),
1805         },
1806 };
1807
1808 static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = {
1809         {
1810                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1811                 .offset = offsetof(struct flow_keys, control),
1812         },
1813         {
1814                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1815                 .offset = offsetof(struct flow_keys, basic),
1816         },
1817 };
1818
1819 struct flow_dissector flow_keys_dissector __read_mostly;
1820 EXPORT_SYMBOL(flow_keys_dissector);
1821
1822 struct flow_dissector flow_keys_basic_dissector __read_mostly;
1823 EXPORT_SYMBOL(flow_keys_basic_dissector);
1824
1825 static int __init init_default_flow_dissectors(void)
1826 {
1827         skb_flow_dissector_init(&flow_keys_dissector,
1828                                 flow_keys_dissector_keys,
1829                                 ARRAY_SIZE(flow_keys_dissector_keys));
1830         skb_flow_dissector_init(&flow_keys_dissector_symmetric,
1831                                 flow_keys_dissector_symmetric_keys,
1832                                 ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
1833         skb_flow_dissector_init(&flow_keys_basic_dissector,
1834                                 flow_keys_basic_dissector_keys,
1835                                 ARRAY_SIZE(flow_keys_basic_dissector_keys));
1836         return 0;
1837 }
1838 core_initcall(init_default_flow_dissectors);