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