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
  35 static DEFINE_MUTEX(flow_dissector_mutex);
  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 withing
  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 int skb_flow_dissector_prog_query(const union bpf_attr *attr,
  74                                   union bpf_attr __user *uattr)
  75 {
  76         __u32 __user *prog_ids = u64_to_user_ptr(attr->query.prog_ids);
  77         u32 prog_id, prog_cnt = 0, flags = 0;
  78         struct bpf_prog *attached;
  79         struct net *net;
  80
  81         if (attr->query.query_flags)
  82                 return -EINVAL;
  83
  84         net = get_net_ns_by_fd(attr->query.target_fd);
  85         if (IS_ERR(net))
  86                 return PTR_ERR(net);
  87
  88         rcu_read_lock();
  89         attached = rcu_dereference(net->flow_dissector_prog);
  90         if (attached) {
  91                 prog_cnt = 1;
  92                 prog_id = attached->aux->id;
  93         }
  94         rcu_read_unlock();
  95
  96         put_net(net);
  97
  98         if (copy_to_user(&uattr->query.attach_flags, &flags, sizeof(flags)))
  99                 return -EFAULT;
 100         if (copy_to_user(&uattr->query.prog_cnt, &prog_cnt, sizeof(prog_cnt)))
 101                 return -EFAULT;
 102
 103         if (!attr->query.prog_cnt || !prog_ids || !prog_cnt)
 104                 return 0;
 105
 106         if (copy_to_user(prog_ids, &prog_id, sizeof(u32)))
 107                 return -EFAULT;
 108
 109         return 0;
 110 }
 111
 112 int skb_flow_dissector_bpf_prog_attach(const union bpf_attr *attr,
 113                                        struct bpf_prog *prog)
 114 {
 115         struct bpf_prog *attached;
 116         struct net *net;
 117         int ret = 0;
 118
 119         net = current->nsproxy->net_ns;
 120         mutex_lock(&flow_dissector_mutex);
 121
 122         if (net == &init_net) {
 123                 /* BPF flow dissector in the root namespace overrides
 124                  * any per-net-namespace one. When attaching to root,
 125                  * make sure we don't have any BPF program attached
 126                  * to the non-root namespaces.
 127                  */
 128                 struct net *ns;
 129
 130                 for_each_net(ns) {
 131                         if (ns == &init_net)
 132                                 continue;
 133                         if (rcu_access_pointer(ns->flow_dissector_prog)) {
 134                                 ret = -EEXIST;
 135                                 goto out;
 136                         }
 137                 }
 138         } else {
 139                 /* Make sure root flow dissector is not attached
 140                  * when attaching to the non-root namespace.
 141                  */
 142                 if (rcu_access_pointer(init_net.flow_dissector_prog)) {
 143                         ret = -EEXIST;
 144                         goto out;
 145                 }
 146         }
 147
 148         attached = rcu_dereference_protected(net->flow_dissector_prog,
 149                                              lockdep_is_held(&flow_dissector_mutex));
 150         if (attached == prog) {
 151                 /* The same program cannot be attached twice */
 152                 ret = -EINVAL;
 153                 goto out;
 154         }
 155         rcu_assign_pointer(net->flow_dissector_prog, prog);
 156         if (attached)
 157                 bpf_prog_put(attached);
 158 out:
 159         mutex_unlock(&flow_dissector_mutex);
 160         return ret;
 161 }
 162
 163 int skb_flow_dissector_bpf_prog_detach(const union bpf_attr *attr)
 164 {
 165         struct bpf_prog *attached;
 166         struct net *net;
 167
 168         net = current->nsproxy->net_ns;
 169         mutex_lock(&flow_dissector_mutex);
 170         attached = rcu_dereference_protected(net->flow_dissector_prog,
 171                                              lockdep_is_held(&flow_dissector_mutex));
 172         if (!attached) {
 173                 mutex_unlock(&flow_dissector_mutex);
 174                 return -ENOENT;
 175         }
 176         RCU_INIT_POINTER(net->flow_dissector_prog, NULL);
 177         bpf_prog_put(attached);
 178         mutex_unlock(&flow_dissector_mutex);
 179         return 0;
 180 }
 181
 182 /**
 183  * __skb_flow_get_ports - extract the upper layer ports and return them
 184  * @skb: sk_buff to extract the ports from
 185  * @thoff: transport header offset
 186  * @ip_proto: protocol for which to get port offset
 187  * @data: raw buffer pointer to the packet, if NULL use skb->data
 188  * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
 189  *
 190  * The function will try to retrieve the ports at offset thoff + poff where poff
 191  * is the protocol port offset returned from proto_ports_offset
 192  */
 193 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
 194                             void *data, int hlen)
 195 {
 196         int poff = proto_ports_offset(ip_proto);
 197
 198         if (!data) {
 199                 data = skb->data;
 200                 hlen = skb_headlen(skb);
 201         }
 202
 203         if (poff >= 0) {
 204                 __be32 *ports, _ports;
 205
 206                 ports = __skb_header_pointer(skb, thoff + poff,
 207                                              sizeof(_ports), data, hlen, &_ports);
 208                 if (ports)
 209                         return *ports;
 210         }
 211
 212         return 0;
 213 }
 214 EXPORT_SYMBOL(__skb_flow_get_ports);
 215
 216 static bool icmp_has_id(u8 type)
 217 {
 218         switch (type) {
 219         case ICMP_ECHO:
 220         case ICMP_ECHOREPLY:
 221         case ICMP_TIMESTAMP:
 222         case ICMP_TIMESTAMPREPLY:
 223         case ICMPV6_ECHO_REQUEST:
 224         case ICMPV6_ECHO_REPLY:
 225                 return true;
 226         }
 227
 228         return false;
 229 }
 230
 231 /**
 232  * skb_flow_get_icmp_tci - extract ICMP(6) Type, Code and Identifier fields
 233  * @skb: sk_buff to extract from
 234  * @key_icmp: struct flow_dissector_key_icmp to fill
 235  * @data: raw buffer pointer to the packet
 236  * @toff: offset to extract at
 237  * @hlen: packet header length
 238  */
 239 void skb_flow_get_icmp_tci(const struct sk_buff *skb,
 240                            struct flow_dissector_key_icmp *key_icmp,
 241                            void *data, int thoff, int hlen)
 242 {
 243         struct icmphdr *ih, _ih;
 244
 245         ih = __skb_header_pointer(skb, thoff, sizeof(_ih), data, hlen, &_ih);
 246         if (!ih)
 247                 return;
 248
 249         key_icmp->type = ih->type;
 250         key_icmp->code = ih->code;
 251
 252         /* As we use 0 to signal that the Id field is not present,
 253          * avoid confusion with packets without such field
 254          */
 255         if (icmp_has_id(ih->type))
 256                 key_icmp->id = ih->un.echo.id ? : 1;
 257         else
 258                 key_icmp->id = 0;
 259 }
 260 EXPORT_SYMBOL(skb_flow_get_icmp_tci);
 261
 262 /* If FLOW_DISSECTOR_KEY_ICMP is set, dissect an ICMP packet
 263  * using skb_flow_get_icmp_tci().
 264  */
 265 static void __skb_flow_dissect_icmp(const struct sk_buff *skb,
 266                                     struct flow_dissector *flow_dissector,
 267                                     void *target_container,
 268                                     void *data, int thoff, int hlen)
 269 {
 270         struct flow_dissector_key_icmp *key_icmp;
 271
 272         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ICMP))
 273                 return;
 274
 275         key_icmp = skb_flow_dissector_target(flow_dissector,
 276                                              FLOW_DISSECTOR_KEY_ICMP,
 277                                              target_container);
 278
 279         skb_flow_get_icmp_tci(skb, key_icmp, data, thoff, hlen);
 280 }
 281
 282 void skb_flow_dissect_meta(const struct sk_buff *skb,
 283                            struct flow_dissector *flow_dissector,
 284                            void *target_container)
 285 {
 286         struct flow_dissector_key_meta *meta;
 287
 288         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_META))
 289                 return;
 290
 291         meta = skb_flow_dissector_target(flow_dissector,
 292                                          FLOW_DISSECTOR_KEY_META,
 293                                          target_container);
 294         meta->ingress_ifindex = skb->skb_iif;
 295 }
 296 EXPORT_SYMBOL(skb_flow_dissect_meta);
 297
 298 static void
 299 skb_flow_dissect_set_enc_addr_type(enum flow_dissector_key_id type,
 300                                    struct flow_dissector *flow_dissector,
 301                                    void *target_container)
 302 {
 303         struct flow_dissector_key_control *ctrl;
 304
 305         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_CONTROL))
 306                 return;
 307
 308         ctrl = skb_flow_dissector_target(flow_dissector,
 309                                          FLOW_DISSECTOR_KEY_ENC_CONTROL,
 310                                          target_container);
 311         ctrl->addr_type = type;
 312 }
 313
 314 void
 315 skb_flow_dissect_ct(const struct sk_buff *skb,
 316                     struct flow_dissector *flow_dissector,
 317                     void *target_container,
 318                     u16 *ctinfo_map,
 319                     size_t mapsize)
 320 {
 321 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 322         struct flow_dissector_key_ct *key;
 323         enum ip_conntrack_info ctinfo;
 324         struct nf_conn_labels *cl;
 325         struct nf_conn *ct;
 326
 327         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CT))
 328                 return;
 329
 330         ct = nf_ct_get(skb, &ctinfo);
 331         if (!ct)
 332                 return;
 333
 334         key = skb_flow_dissector_target(flow_dissector,
 335                                         FLOW_DISSECTOR_KEY_CT,
 336                                         target_container);
 337
 338         if (ctinfo < mapsize)
 339                 key->ct_state = ctinfo_map[ctinfo];
 340 #if IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)
 341         key->ct_zone = ct->zone.id;
 342 #endif
 343 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
 344         key->ct_mark = ct->mark;
 345 #endif
 346
 347         cl = nf_ct_labels_find(ct);
 348         if (cl)
 349                 memcpy(key->ct_labels, cl->bits, sizeof(key->ct_labels));
 350 #endif /* CONFIG_NF_CONNTRACK */
 351 }
 352 EXPORT_SYMBOL(skb_flow_dissect_ct);
 353
 354 void
 355 skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
 356                              struct flow_dissector *flow_dissector,
 357                              void *target_container)
 358 {
 359         struct ip_tunnel_info *info;
 360         struct ip_tunnel_key *key;
 361
 362         /* A quick check to see if there might be something to do. */
 363         if (!dissector_uses_key(flow_dissector,
 364                                 FLOW_DISSECTOR_KEY_ENC_KEYID) &&
 365             !dissector_uses_key(flow_dissector,
 366                                 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) &&
 367             !dissector_uses_key(flow_dissector,
 368                                 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) &&
 369             !dissector_uses_key(flow_dissector,
 370                                 FLOW_DISSECTOR_KEY_ENC_CONTROL) &&
 371             !dissector_uses_key(flow_dissector,
 372                                 FLOW_DISSECTOR_KEY_ENC_PORTS) &&
 373             !dissector_uses_key(flow_dissector,
 374                                 FLOW_DISSECTOR_KEY_ENC_IP) &&
 375             !dissector_uses_key(flow_dissector,
 376                                 FLOW_DISSECTOR_KEY_ENC_OPTS))
 377                 return;
 378
 379         info = skb_tunnel_info(skb);
 380         if (!info)
 381                 return;
 382
 383         key = &info->key;
 384
 385         switch (ip_tunnel_info_af(info)) {
 386         case AF_INET:
 387                 skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 388                                                    flow_dissector,
 389                                                    target_container);
 390                 if (dissector_uses_key(flow_dissector,
 391                                        FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
 392                         struct flow_dissector_key_ipv4_addrs *ipv4;
 393
 394                         ipv4 = skb_flow_dissector_target(flow_dissector,
 395                                                          FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
 396                                                          target_container);
 397                         ipv4->src = key->u.ipv4.src;
 398                         ipv4->dst = key->u.ipv4.dst;
 399                 }
 400                 break;
 401         case AF_INET6:
 402                 skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 403                                                    flow_dissector,
 404                                                    target_container);
 405                 if (dissector_uses_key(flow_dissector,
 406                                        FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) {
 407                         struct flow_dissector_key_ipv6_addrs *ipv6;
 408
 409                         ipv6 = skb_flow_dissector_target(flow_dissector,
 410                                                          FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS,
 411                                                          target_container);
 412                         ipv6->src = key->u.ipv6.src;
 413                         ipv6->dst = key->u.ipv6.dst;
 414                 }
 415                 break;
 416         }
 417
 418         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
 419                 struct flow_dissector_key_keyid *keyid;
 420
 421                 keyid = skb_flow_dissector_target(flow_dissector,
 422                                                   FLOW_DISSECTOR_KEY_ENC_KEYID,
 423                                                   target_container);
 424                 keyid->keyid = tunnel_id_to_key32(key->tun_id);
 425         }
 426
 427         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
 428                 struct flow_dissector_key_ports *tp;
 429
 430                 tp = skb_flow_dissector_target(flow_dissector,
 431                                                FLOW_DISSECTOR_KEY_ENC_PORTS,
 432                                                target_container);
 433                 tp->src = key->tp_src;
 434                 tp->dst = key->tp_dst;
 435         }
 436
 437         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_IP)) {
 438                 struct flow_dissector_key_ip *ip;
 439
 440                 ip = skb_flow_dissector_target(flow_dissector,
 441                                                FLOW_DISSECTOR_KEY_ENC_IP,
 442                                                target_container);
 443                 ip->tos = key->tos;
 444                 ip->ttl = key->ttl;
 445         }
 446
 447         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_OPTS)) {
 448                 struct flow_dissector_key_enc_opts *enc_opt;
 449
 450                 enc_opt = skb_flow_dissector_target(flow_dissector,
 451                                                     FLOW_DISSECTOR_KEY_ENC_OPTS,
 452                                                     target_container);
 453
 454                 if (info->options_len) {
 455                         enc_opt->len = info->options_len;
 456                         ip_tunnel_info_opts_get(enc_opt->data, info);
 457                         enc_opt->dst_opt_type = info->key.tun_flags &
 458                                                 TUNNEL_OPTIONS_PRESENT;
 459                 }
 460         }
 461 }
 462 EXPORT_SYMBOL(skb_flow_dissect_tunnel_info);
 463
 464 static enum flow_dissect_ret
 465 __skb_flow_dissect_mpls(const struct sk_buff *skb,
 466                         struct flow_dissector *flow_dissector,
 467                         void *target_container, void *data, int nhoff, int hlen)
 468 {
 469         struct flow_dissector_key_keyid *key_keyid;
 470         struct mpls_label *hdr, _hdr[2];
 471         u32 entry, label;
 472
 473         if (!dissector_uses_key(flow_dissector,
 474                                 FLOW_DISSECTOR_KEY_MPLS_ENTROPY) &&
 475             !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS))
 476                 return FLOW_DISSECT_RET_OUT_GOOD;
 477
 478         hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
 479                                    hlen, &_hdr);
 480         if (!hdr)
 481                 return FLOW_DISSECT_RET_OUT_BAD;
 482
 483         entry = ntohl(hdr[0].entry);
 484         label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
 485
 486         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) {
 487                 struct flow_dissector_key_mpls *key_mpls;
 488
 489                 key_mpls = skb_flow_dissector_target(flow_dissector,
 490                                                      FLOW_DISSECTOR_KEY_MPLS,
 491                                                      target_container);
 492                 key_mpls->mpls_label = label;
 493                 key_mpls->mpls_ttl = (entry & MPLS_LS_TTL_MASK)
 494                                         >> MPLS_LS_TTL_SHIFT;
 495                 key_mpls->mpls_tc = (entry & MPLS_LS_TC_MASK)
 496                                         >> MPLS_LS_TC_SHIFT;
 497                 key_mpls->mpls_bos = (entry & MPLS_LS_S_MASK)
 498                                         >> MPLS_LS_S_SHIFT;
 499         }
 500
 501         if (label == MPLS_LABEL_ENTROPY) {
 502                 key_keyid = skb_flow_dissector_target(flow_dissector,
 503                                                       FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
 504                                                       target_container);
 505                 key_keyid->keyid = hdr[1].entry & htonl(MPLS_LS_LABEL_MASK);
 506         }
 507         return FLOW_DISSECT_RET_OUT_GOOD;
 508 }
 509
 510 static enum flow_dissect_ret
 511 __skb_flow_dissect_arp(const struct sk_buff *skb,
 512                        struct flow_dissector *flow_dissector,
 513                        void *target_container, void *data, int nhoff, int hlen)
 514 {
 515         struct flow_dissector_key_arp *key_arp;
 516         struct {
 517                 unsigned char ar_sha[ETH_ALEN];
 518                 unsigned char ar_sip[4];
 519                 unsigned char ar_tha[ETH_ALEN];
 520                 unsigned char ar_tip[4];
 521         } *arp_eth, _arp_eth;
 522         const struct arphdr *arp;
 523         struct arphdr _arp;
 524
 525         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP))
 526                 return FLOW_DISSECT_RET_OUT_GOOD;
 527
 528         arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
 529                                    hlen, &_arp);
 530         if (!arp)
 531                 return FLOW_DISSECT_RET_OUT_BAD;
 532
 533         if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
 534             arp->ar_pro != htons(ETH_P_IP) ||
 535             arp->ar_hln != ETH_ALEN ||
 536             arp->ar_pln != 4 ||
 537             (arp->ar_op != htons(ARPOP_REPLY) &&
 538              arp->ar_op != htons(ARPOP_REQUEST)))
 539                 return FLOW_DISSECT_RET_OUT_BAD;
 540
 541         arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
 542                                        sizeof(_arp_eth), data,
 543                                        hlen, &_arp_eth);
 544         if (!arp_eth)
 545                 return FLOW_DISSECT_RET_OUT_BAD;
 546
 547         key_arp = skb_flow_dissector_target(flow_dissector,
 548                                             FLOW_DISSECTOR_KEY_ARP,
 549                                             target_container);
 550
 551         memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip));
 552         memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip));
 553
 554         /* Only store the lower byte of the opcode;
 555          * this covers ARPOP_REPLY and ARPOP_REQUEST.
 556          */
 557         key_arp->op = ntohs(arp->ar_op) & 0xff;
 558
 559         ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
 560         ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
 561
 562         return FLOW_DISSECT_RET_OUT_GOOD;
 563 }
 564
 565 static enum flow_dissect_ret
 566 __skb_flow_dissect_gre(const struct sk_buff *skb,
 567                        struct flow_dissector_key_control *key_control,
 568                        struct flow_dissector *flow_dissector,
 569                        void *target_container, void *data,
 570                        __be16 *p_proto, int *p_nhoff, int *p_hlen,
 571                        unsigned int flags)
 572 {
 573         struct flow_dissector_key_keyid *key_keyid;
 574         struct gre_base_hdr *hdr, _hdr;
 575         int offset = 0;
 576         u16 gre_ver;
 577
 578         hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr),
 579                                    data, *p_hlen, &_hdr);
 580         if (!hdr)
 581                 return FLOW_DISSECT_RET_OUT_BAD;
 582
 583         /* Only look inside GRE without routing */
 584         if (hdr->flags & GRE_ROUTING)
 585                 return FLOW_DISSECT_RET_OUT_GOOD;
 586
 587         /* Only look inside GRE for version 0 and 1 */
 588         gre_ver = ntohs(hdr->flags & GRE_VERSION);
 589         if (gre_ver > 1)
 590                 return FLOW_DISSECT_RET_OUT_GOOD;
 591
 592         *p_proto = hdr->protocol;
 593         if (gre_ver) {
 594                 /* Version1 must be PPTP, and check the flags */
 595                 if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
 596                         return FLOW_DISSECT_RET_OUT_GOOD;
 597         }
 598
 599         offset += sizeof(struct gre_base_hdr);
 600
 601         if (hdr->flags & GRE_CSUM)
 602                 offset += FIELD_SIZEOF(struct gre_full_hdr, csum) +
 603                           FIELD_SIZEOF(struct gre_full_hdr, reserved1);
 604
 605         if (hdr->flags & GRE_KEY) {
 606                 const __be32 *keyid;
 607                 __be32 _keyid;
 608
 609                 keyid = __skb_header_pointer(skb, *p_nhoff + offset,
 610                                              sizeof(_keyid),
 611                                              data, *p_hlen, &_keyid);
 612                 if (!keyid)
 613                         return FLOW_DISSECT_RET_OUT_BAD;
 614
 615                 if (dissector_uses_key(flow_dissector,
 616                                        FLOW_DISSECTOR_KEY_GRE_KEYID)) {
 617                         key_keyid = skb_flow_dissector_target(flow_dissector,
 618                                                               FLOW_DISSECTOR_KEY_GRE_KEYID,
 619                                                               target_container);
 620                         if (gre_ver == 0)
 621                                 key_keyid->keyid = *keyid;
 622                         else
 623                                 key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
 624                 }
 625                 offset += FIELD_SIZEOF(struct gre_full_hdr, key);
 626         }
 627
 628         if (hdr->flags & GRE_SEQ)
 629                 offset += FIELD_SIZEOF(struct pptp_gre_header, seq);
 630
 631         if (gre_ver == 0) {
 632                 if (*p_proto == htons(ETH_P_TEB)) {
 633                         const struct ethhdr *eth;
 634                         struct ethhdr _eth;
 635
 636                         eth = __skb_header_pointer(skb, *p_nhoff + offset,
 637                                                    sizeof(_eth),
 638                                                    data, *p_hlen, &_eth);
 639                         if (!eth)
 640                                 return FLOW_DISSECT_RET_OUT_BAD;
 641                         *p_proto = eth->h_proto;
 642                         offset += sizeof(*eth);
 643
 644                         /* Cap headers that we access via pointers at the
 645                          * end of the Ethernet header as our maximum alignment
 646                          * at that point is only 2 bytes.
 647                          */
 648                         if (NET_IP_ALIGN)
 649                                 *p_hlen = *p_nhoff + offset;
 650                 }
 651         } else { /* version 1, must be PPTP */
 652                 u8 _ppp_hdr[PPP_HDRLEN];
 653                 u8 *ppp_hdr;
 654
 655                 if (hdr->flags & GRE_ACK)
 656                         offset += FIELD_SIZEOF(struct pptp_gre_header, ack);
 657
 658                 ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset,
 659                                                sizeof(_ppp_hdr),
 660                                                data, *p_hlen, _ppp_hdr);
 661                 if (!ppp_hdr)
 662                         return FLOW_DISSECT_RET_OUT_BAD;
 663
 664                 switch (PPP_PROTOCOL(ppp_hdr)) {
 665                 case PPP_IP:
 666                         *p_proto = htons(ETH_P_IP);
 667                         break;
 668                 case PPP_IPV6:
 669                         *p_proto = htons(ETH_P_IPV6);
 670                         break;
 671                 default:
 672                         /* Could probably catch some more like MPLS */
 673                         break;
 674                 }
 675
 676                 offset += PPP_HDRLEN;
 677         }
 678
 679         *p_nhoff += offset;
 680         key_control->flags |= FLOW_DIS_ENCAPSULATION;
 681         if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 682                 return FLOW_DISSECT_RET_OUT_GOOD;
 683
 684         return FLOW_DISSECT_RET_PROTO_AGAIN;
 685 }
 686
 687 /**
 688  * __skb_flow_dissect_batadv() - dissect batman-adv header
 689  * @skb: sk_buff to with the batman-adv header
 690  * @key_control: flow dissectors control key
 691  * @data: raw buffer pointer to the packet, if NULL use skb->data
 692  * @p_proto: pointer used to update the protocol to process next
 693  * @p_nhoff: pointer used to update inner network header offset
 694  * @hlen: packet header length
 695  * @flags: any combination of FLOW_DISSECTOR_F_*
 696  *
 697  * ETH_P_BATMAN packets are tried to be dissected. Only
 698  * &struct batadv_unicast packets are actually processed because they contain an
 699  * inner ethernet header and are usually followed by actual network header. This
 700  * allows the flow dissector to continue processing the packet.
 701  *
 702  * Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found,
 703  *  FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation,
 704  *  otherwise FLOW_DISSECT_RET_OUT_BAD
 705  */
 706 static enum flow_dissect_ret
 707 __skb_flow_dissect_batadv(const struct sk_buff *skb,
 708                           struct flow_dissector_key_control *key_control,
 709                           void *data, __be16 *p_proto, int *p_nhoff, int hlen,
 710                           unsigned int flags)
 711 {
 712         struct {
 713                 struct batadv_unicast_packet batadv_unicast;
 714                 struct ethhdr eth;
 715         } *hdr, _hdr;
 716
 717         hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen,
 718                                    &_hdr);
 719         if (!hdr)
 720                 return FLOW_DISSECT_RET_OUT_BAD;
 721
 722         if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION)
 723                 return FLOW_DISSECT_RET_OUT_BAD;
 724
 725         if (hdr->batadv_unicast.packet_type != BATADV_UNICAST)
 726                 return FLOW_DISSECT_RET_OUT_BAD;
 727
 728         *p_proto = hdr->eth.h_proto;
 729         *p_nhoff += sizeof(*hdr);
 730
 731         key_control->flags |= FLOW_DIS_ENCAPSULATION;
 732         if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 733                 return FLOW_DISSECT_RET_OUT_GOOD;
 734
 735         return FLOW_DISSECT_RET_PROTO_AGAIN;
 736 }
 737
 738 static void
 739 __skb_flow_dissect_tcp(const struct sk_buff *skb,
 740                        struct flow_dissector *flow_dissector,
 741                        void *target_container, void *data, int thoff, int hlen)
 742 {
 743         struct flow_dissector_key_tcp *key_tcp;
 744         struct tcphdr *th, _th;
 745
 746         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
 747                 return;
 748
 749         th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
 750         if (!th)
 751                 return;
 752
 753         if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
 754                 return;
 755
 756         key_tcp = skb_flow_dissector_target(flow_dissector,
 757                                             FLOW_DISSECTOR_KEY_TCP,
 758                                             target_container);
 759         key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
 760 }
 761
 762 static void
 763 __skb_flow_dissect_ipv4(const struct sk_buff *skb,
 764                         struct flow_dissector *flow_dissector,
 765                         void *target_container, void *data, const struct iphdr *iph)
 766 {
 767         struct flow_dissector_key_ip *key_ip;
 768
 769         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
 770                 return;
 771
 772         key_ip = skb_flow_dissector_target(flow_dissector,
 773                                            FLOW_DISSECTOR_KEY_IP,
 774                                            target_container);
 775         key_ip->tos = iph->tos;
 776         key_ip->ttl = iph->ttl;
 777 }
 778
 779 static void
 780 __skb_flow_dissect_ipv6(const struct sk_buff *skb,
 781                         struct flow_dissector *flow_dissector,
 782                         void *target_container, void *data, const struct ipv6hdr *iph)
 783 {
 784         struct flow_dissector_key_ip *key_ip;
 785
 786         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
 787                 return;
 788
 789         key_ip = skb_flow_dissector_target(flow_dissector,
 790                                            FLOW_DISSECTOR_KEY_IP,
 791                                            target_container);
 792         key_ip->tos = ipv6_get_dsfield(iph);
 793         key_ip->ttl = iph->hop_limit;
 794 }
 795
 796 /* Maximum number of protocol headers that can be parsed in
 797  * __skb_flow_dissect
 798  */
 799 #define MAX_FLOW_DISSECT_HDRS   15
 800
 801 static bool skb_flow_dissect_allowed(int *num_hdrs)
 802 {
 803         ++*num_hdrs;
 804
 805         return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS);
 806 }
 807
 808 static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
 809                                      struct flow_dissector *flow_dissector,
 810                                      void *target_container)
 811 {
 812         struct flow_dissector_key_control *key_control;
 813         struct flow_dissector_key_basic *key_basic;
 814         struct flow_dissector_key_addrs *key_addrs;
 815         struct flow_dissector_key_ports *key_ports;
 816         struct flow_dissector_key_tags *key_tags;
 817
 818         key_control = skb_flow_dissector_target(flow_dissector,
 819                                                 FLOW_DISSECTOR_KEY_CONTROL,
 820                                                 target_container);
 821         key_control->thoff = flow_keys->thoff;
 822         if (flow_keys->is_frag)
 823                 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
 824         if (flow_keys->is_first_frag)
 825                 key_control->flags |= FLOW_DIS_FIRST_FRAG;
 826         if (flow_keys->is_encap)
 827                 key_control->flags |= FLOW_DIS_ENCAPSULATION;
 828
 829         key_basic = skb_flow_dissector_target(flow_dissector,
 830                                               FLOW_DISSECTOR_KEY_BASIC,
 831                                               target_container);
 832         key_basic->n_proto = flow_keys->n_proto;
 833         key_basic->ip_proto = flow_keys->ip_proto;
 834
 835         if (flow_keys->addr_proto == ETH_P_IP &&
 836             dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
 837                 key_addrs = skb_flow_dissector_target(flow_dissector,
 838                                                       FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 839                                                       target_container);
 840                 key_addrs->v4addrs.src = flow_keys->ipv4_src;
 841                 key_addrs->v4addrs.dst = flow_keys->ipv4_dst;
 842                 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 843         } else if (flow_keys->addr_proto == ETH_P_IPV6 &&
 844                    dissector_uses_key(flow_dissector,
 845                                       FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
 846                 key_addrs = skb_flow_dissector_target(flow_dissector,
 847                                                       FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 848                                                       target_container);
 849                 memcpy(&key_addrs->v6addrs, &flow_keys->ipv6_src,
 850                        sizeof(key_addrs->v6addrs));
 851                 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 852         }
 853
 854         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS)) {
 855                 key_ports = skb_flow_dissector_target(flow_dissector,
 856                                                       FLOW_DISSECTOR_KEY_PORTS,
 857                                                       target_container);
 858                 key_ports->src = flow_keys->sport;
 859                 key_ports->dst = flow_keys->dport;
 860         }
 861
 862         if (dissector_uses_key(flow_dissector,
 863                                FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
 864                 key_tags = skb_flow_dissector_target(flow_dissector,
 865                                                      FLOW_DISSECTOR_KEY_FLOW_LABEL,
 866                                                      target_container);
 867                 key_tags->flow_label = ntohl(flow_keys->flow_label);
 868         }
 869 }
 870
 871 bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
 872                       __be16 proto, int nhoff, int hlen, unsigned int flags)
 873 {
 874         struct bpf_flow_keys *flow_keys = ctx->flow_keys;
 875         u32 result;
 876
 877         /* Pass parameters to the BPF program */
 878         memset(flow_keys, 0, sizeof(*flow_keys));
 879         flow_keys->n_proto = proto;
 880         flow_keys->nhoff = nhoff;
 881         flow_keys->thoff = flow_keys->nhoff;
 882
 883         BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG !=
 884                      (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG);
 885         BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL !=
 886                      (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
 887         BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP !=
 888                      (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP);
 889         flow_keys->flags = flags;
 890
 891         preempt_disable();
 892         result = BPF_PROG_RUN(prog, ctx);
 893         preempt_enable();
 894
 895         flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen);
 896         flow_keys->thoff = clamp_t(u16, flow_keys->thoff,
 897                                    flow_keys->nhoff, hlen);
 898
 899         return result == BPF_OK;
 900 }
 901
 902 /**
 903  * __skb_flow_dissect - extract the flow_keys struct and return it
 904  * @net: associated network namespace, derived from @skb if NULL
 905  * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
 906  * @flow_dissector: list of keys to dissect
 907  * @target_container: target structure to put dissected values into
 908  * @data: raw buffer pointer to the packet, if NULL use skb->data
 909  * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
 910  * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
 911  * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
 912  * @flags: flags that control the dissection process, e.g.
 913  *         FLOW_DISSECTOR_F_STOP_AT_ENCAP.
 914  *
 915  * The function will try to retrieve individual keys into target specified
 916  * by flow_dissector from either the skbuff or a raw buffer specified by the
 917  * rest parameters.
 918  *
 919  * Caller must take care of zeroing target container memory.
 920  */
 921 bool __skb_flow_dissect(const struct net *net,
 922                         const struct sk_buff *skb,
 923                         struct flow_dissector *flow_dissector,
 924                         void *target_container,
 925                         void *data, __be16 proto, int nhoff, int hlen,
 926                         unsigned int flags)
 927 {
 928         struct flow_dissector_key_control *key_control;
 929         struct flow_dissector_key_basic *key_basic;
 930         struct flow_dissector_key_addrs *key_addrs;
 931         struct flow_dissector_key_ports *key_ports;
 932         struct flow_dissector_key_tags *key_tags;
 933         struct flow_dissector_key_vlan *key_vlan;
 934         struct bpf_prog *attached = NULL;
 935         enum flow_dissect_ret fdret;
 936         enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX;
 937         int num_hdrs = 0;
 938         u8 ip_proto = 0;
 939         bool ret;
 940
 941         if (!data) {
 942                 data = skb->data;
 943                 proto = skb_vlan_tag_present(skb) ?
 944                          skb->vlan_proto : skb->protocol;
 945                 nhoff = skb_network_offset(skb);
 946                 hlen = skb_headlen(skb);
 947 #if IS_ENABLED(CONFIG_NET_DSA)
 948                 if (unlikely(skb->dev && netdev_uses_dsa(skb->dev))) {
 949                         const struct dsa_device_ops *ops;
 950                         int offset;
 951
 952                         ops = skb->dev->dsa_ptr->tag_ops;
 953                         if (ops->flow_dissect &&
 954                             !ops->flow_dissect(skb, &proto, &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                 rcu_read_lock();
 988                 attached = rcu_dereference(init_net.flow_dissector_prog);
 989
 990                 if (!attached)
 991                         attached = rcu_dereference(net->flow_dissector_prog);
 992
 993                 if (attached) {
 994                         struct bpf_flow_keys flow_keys;
 995                         struct bpf_flow_dissector ctx = {
 996                                 .flow_keys = &flow_keys,
 997                                 .data = data,
 998                                 .data_end = data + hlen,
 999                         };
1000                         __be16 n_proto = proto;
1001
1002                         if (skb) {
1003                                 ctx.skb = skb;
1004                                 /* we can't use 'proto' in the skb case
1005                                  * because it might be set to skb->vlan_proto
1006                                  * which has been pulled from the data
1007                                  */
1008                                 n_proto = skb->protocol;
1009                         }
1010
1011                         ret = bpf_flow_dissect(attached, &ctx, n_proto, nhoff,
1012                                                hlen, flags);
1013                         __skb_flow_bpf_to_target(&flow_keys, flow_dissector,
1014                                                  target_container);
1015                         rcu_read_unlock();
1016                         return ret;
1017                 }
1018                 rcu_read_unlock();
1019         }
1020
1021         if (dissector_uses_key(flow_dissector,
1022                                FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
1023                 struct ethhdr *eth = eth_hdr(skb);
1024                 struct flow_dissector_key_eth_addrs *key_eth_addrs;
1025
1026                 key_eth_addrs = skb_flow_dissector_target(flow_dissector,
1027                                                           FLOW_DISSECTOR_KEY_ETH_ADDRS,
1028                                                           target_container);
1029                 memcpy(key_eth_addrs, &eth->h_dest, sizeof(*key_eth_addrs));
1030         }
1031
1032 proto_again:
1033         fdret = FLOW_DISSECT_RET_CONTINUE;
1034
1035         switch (proto) {
1036         case htons(ETH_P_IP): {
1037                 const struct iphdr *iph;
1038                 struct iphdr _iph;
1039
1040                 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
1041                 if (!iph || iph->ihl < 5) {
1042                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1043                         break;
1044                 }
1045
1046                 nhoff += iph->ihl * 4;
1047
1048                 ip_proto = iph->protocol;
1049
1050                 if (dissector_uses_key(flow_dissector,
1051                                        FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
1052                         key_addrs = skb_flow_dissector_target(flow_dissector,
1053                                                               FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1054                                                               target_container);
1055
1056                         memcpy(&key_addrs->v4addrs, &iph->saddr,
1057                                sizeof(key_addrs->v4addrs));
1058                         key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
1059                 }
1060
1061                 if (ip_is_fragment(iph)) {
1062                         key_control->flags |= FLOW_DIS_IS_FRAGMENT;
1063
1064                         if (iph->frag_off & htons(IP_OFFSET)) {
1065                                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1066                                 break;
1067                         } else {
1068                                 key_control->flags |= FLOW_DIS_FIRST_FRAG;
1069                                 if (!(flags &
1070                                       FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) {
1071                                         fdret = FLOW_DISSECT_RET_OUT_GOOD;
1072                                         break;
1073                                 }
1074                         }
1075                 }
1076
1077                 __skb_flow_dissect_ipv4(skb, flow_dissector,
1078                                         target_container, data, iph);
1079
1080                 break;
1081         }
1082         case htons(ETH_P_IPV6): {
1083                 const struct ipv6hdr *iph;
1084                 struct ipv6hdr _iph;
1085
1086                 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
1087                 if (!iph) {
1088                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1089                         break;
1090                 }
1091
1092                 ip_proto = iph->nexthdr;
1093                 nhoff += sizeof(struct ipv6hdr);
1094
1095                 if (dissector_uses_key(flow_dissector,
1096                                        FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
1097                         key_addrs = skb_flow_dissector_target(flow_dissector,
1098                                                               FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1099                                                               target_container);
1100
1101                         memcpy(&key_addrs->v6addrs, &iph->saddr,
1102                                sizeof(key_addrs->v6addrs));
1103                         key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1104                 }
1105
1106                 if ((dissector_uses_key(flow_dissector,
1107                                         FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
1108                      (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
1109                     ip6_flowlabel(iph)) {
1110                         __be32 flow_label = ip6_flowlabel(iph);
1111
1112                         if (dissector_uses_key(flow_dissector,
1113                                                FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
1114                                 key_tags = skb_flow_dissector_target(flow_dissector,
1115                                                                      FLOW_DISSECTOR_KEY_FLOW_LABEL,
1116                                                                      target_container);
1117                                 key_tags->flow_label = ntohl(flow_label);
1118                         }
1119                         if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) {
1120                                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1121                                 break;
1122                         }
1123                 }
1124
1125                 __skb_flow_dissect_ipv6(skb, flow_dissector,
1126                                         target_container, data, iph);
1127
1128                 break;
1129         }
1130         case htons(ETH_P_8021AD):
1131         case htons(ETH_P_8021Q): {
1132                 const struct vlan_hdr *vlan = NULL;
1133                 struct vlan_hdr _vlan;
1134                 __be16 saved_vlan_tpid = proto;
1135
1136                 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX &&
1137                     skb && skb_vlan_tag_present(skb)) {
1138                         proto = skb->protocol;
1139                 } else {
1140                         vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
1141                                                     data, hlen, &_vlan);
1142                         if (!vlan) {
1143                                 fdret = FLOW_DISSECT_RET_OUT_BAD;
1144                                 break;
1145                         }
1146
1147                         proto = vlan->h_vlan_encapsulated_proto;
1148                         nhoff += sizeof(*vlan);
1149                 }
1150
1151                 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) {
1152                         dissector_vlan = FLOW_DISSECTOR_KEY_VLAN;
1153                 } else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) {
1154                         dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN;
1155                 } else {
1156                         fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1157                         break;
1158                 }
1159
1160                 if (dissector_uses_key(flow_dissector, dissector_vlan)) {
1161                         key_vlan = skb_flow_dissector_target(flow_dissector,
1162                                                              dissector_vlan,
1163                                                              target_container);
1164
1165                         if (!vlan) {
1166                                 key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
1167                                 key_vlan->vlan_priority = skb_vlan_tag_get_prio(skb);
1168                         } else {
1169                                 key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
1170                                         VLAN_VID_MASK;
1171                                 key_vlan->vlan_priority =
1172                                         (ntohs(vlan->h_vlan_TCI) &
1173                                          VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
1174                         }
1175                         key_vlan->vlan_tpid = saved_vlan_tpid;
1176                 }
1177
1178                 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1179                 break;
1180         }
1181         case htons(ETH_P_PPP_SES): {
1182                 struct {
1183                         struct pppoe_hdr hdr;
1184                         __be16 proto;
1185                 } *hdr, _hdr;
1186                 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
1187                 if (!hdr) {
1188                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1189                         break;
1190                 }
1191
1192                 proto = hdr->proto;
1193                 nhoff += PPPOE_SES_HLEN;
1194                 switch (proto) {
1195                 case htons(PPP_IP):
1196                         proto = htons(ETH_P_IP);
1197                         fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1198                         break;
1199                 case htons(PPP_IPV6):
1200                         proto = htons(ETH_P_IPV6);
1201                         fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1202                         break;
1203                 default:
1204                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1205                         break;
1206                 }
1207                 break;
1208         }
1209         case htons(ETH_P_TIPC): {
1210                 struct tipc_basic_hdr *hdr, _hdr;
1211
1212                 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr),
1213                                            data, hlen, &_hdr);
1214                 if (!hdr) {
1215                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1216                         break;
1217                 }
1218
1219                 if (dissector_uses_key(flow_dissector,
1220                                        FLOW_DISSECTOR_KEY_TIPC)) {
1221                         key_addrs = skb_flow_dissector_target(flow_dissector,
1222                                                               FLOW_DISSECTOR_KEY_TIPC,
1223                                                               target_container);
1224                         key_addrs->tipckey.key = tipc_hdr_rps_key(hdr);
1225                         key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC;
1226                 }
1227                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1228                 break;
1229         }
1230
1231         case htons(ETH_P_MPLS_UC):
1232         case htons(ETH_P_MPLS_MC):
1233                 fdret = __skb_flow_dissect_mpls(skb, flow_dissector,
1234                                                 target_container, data,
1235                                                 nhoff, hlen);
1236                 break;
1237         case htons(ETH_P_FCOE):
1238                 if ((hlen - nhoff) < FCOE_HEADER_LEN) {
1239                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1240                         break;
1241                 }
1242
1243                 nhoff += FCOE_HEADER_LEN;
1244                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1245                 break;
1246
1247         case htons(ETH_P_ARP):
1248         case htons(ETH_P_RARP):
1249                 fdret = __skb_flow_dissect_arp(skb, flow_dissector,
1250                                                target_container, data,
1251                                                nhoff, hlen);
1252                 break;
1253
1254         case htons(ETH_P_BATMAN):
1255                 fdret = __skb_flow_dissect_batadv(skb, key_control, data,
1256                                                   &proto, &nhoff, hlen, flags);
1257                 break;
1258
1259         default:
1260                 fdret = FLOW_DISSECT_RET_OUT_BAD;
1261                 break;
1262         }
1263
1264         /* Process result of proto processing */
1265         switch (fdret) {
1266         case FLOW_DISSECT_RET_OUT_GOOD:
1267                 goto out_good;
1268         case FLOW_DISSECT_RET_PROTO_AGAIN:
1269                 if (skb_flow_dissect_allowed(&num_hdrs))
1270                         goto proto_again;
1271                 goto out_good;
1272         case FLOW_DISSECT_RET_CONTINUE:
1273         case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1274                 break;
1275         case FLOW_DISSECT_RET_OUT_BAD:
1276         default:
1277                 goto out_bad;
1278         }
1279
1280 ip_proto_again:
1281         fdret = FLOW_DISSECT_RET_CONTINUE;
1282
1283         switch (ip_proto) {
1284         case IPPROTO_GRE:
1285                 fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector,
1286                                                target_container, data,
1287                                                &proto, &nhoff, &hlen, flags);
1288                 break;
1289
1290         case NEXTHDR_HOP:
1291         case NEXTHDR_ROUTING:
1292         case NEXTHDR_DEST: {
1293                 u8 _opthdr[2], *opthdr;
1294
1295                 if (proto != htons(ETH_P_IPV6))
1296                         break;
1297
1298                 opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
1299                                               data, hlen, &_opthdr);
1300                 if (!opthdr) {
1301                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1302                         break;
1303                 }
1304
1305                 ip_proto = opthdr[0];
1306                 nhoff += (opthdr[1] + 1) << 3;
1307
1308                 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1309                 break;
1310         }
1311         case NEXTHDR_FRAGMENT: {
1312                 struct frag_hdr _fh, *fh;
1313
1314                 if (proto != htons(ETH_P_IPV6))
1315                         break;
1316
1317                 fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
1318                                           data, hlen, &_fh);
1319
1320                 if (!fh) {
1321                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1322                         break;
1323                 }
1324
1325                 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
1326
1327                 nhoff += sizeof(_fh);
1328                 ip_proto = fh->nexthdr;
1329
1330                 if (!(fh->frag_off & htons(IP6_OFFSET))) {
1331                         key_control->flags |= FLOW_DIS_FIRST_FRAG;
1332                         if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
1333                                 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1334                                 break;
1335                         }
1336                 }
1337
1338                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1339                 break;
1340         }
1341         case IPPROTO_IPIP:
1342                 proto = htons(ETH_P_IP);
1343
1344                 key_control->flags |= FLOW_DIS_ENCAPSULATION;
1345                 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1346                         fdret = FLOW_DISSECT_RET_OUT_GOOD;
1347                         break;
1348                 }
1349
1350                 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1351                 break;
1352
1353         case IPPROTO_IPV6:
1354                 proto = htons(ETH_P_IPV6);
1355
1356                 key_control->flags |= FLOW_DIS_ENCAPSULATION;
1357                 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1358                         fdret = FLOW_DISSECT_RET_OUT_GOOD;
1359                         break;
1360                 }
1361
1362                 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1363                 break;
1364
1365
1366         case IPPROTO_MPLS:
1367                 proto = htons(ETH_P_MPLS_UC);
1368                 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1369                 break;
1370
1371         case IPPROTO_TCP:
1372                 __skb_flow_dissect_tcp(skb, flow_dissector, target_container,
1373                                        data, nhoff, hlen);
1374                 break;
1375
1376         case IPPROTO_ICMP:
1377         case IPPROTO_ICMPV6:
1378                 __skb_flow_dissect_icmp(skb, flow_dissector, target_container,
1379                                         data, nhoff, hlen);
1380                 break;
1381
1382         default:
1383                 break;
1384         }
1385
1386         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS) &&
1387             !(key_control->flags & FLOW_DIS_IS_FRAGMENT)) {
1388                 key_ports = skb_flow_dissector_target(flow_dissector,
1389                                                       FLOW_DISSECTOR_KEY_PORTS,
1390                                                       target_container);
1391                 key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
1392                                                         data, hlen);
1393         }
1394
1395         /* Process result of IP proto processing */
1396         switch (fdret) {
1397         case FLOW_DISSECT_RET_PROTO_AGAIN:
1398                 if (skb_flow_dissect_allowed(&num_hdrs))
1399                         goto proto_again;
1400                 break;
1401         case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1402                 if (skb_flow_dissect_allowed(&num_hdrs))
1403                         goto ip_proto_again;
1404                 break;
1405         case FLOW_DISSECT_RET_OUT_GOOD:
1406         case FLOW_DISSECT_RET_CONTINUE:
1407                 break;
1408         case FLOW_DISSECT_RET_OUT_BAD:
1409         default:
1410                 goto out_bad;
1411         }
1412
1413 out_good:
1414         ret = true;
1415
1416 out:
1417         key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
1418         key_basic->n_proto = proto;
1419         key_basic->ip_proto = ip_proto;
1420
1421         return ret;
1422
1423 out_bad:
1424         ret = false;
1425         goto out;
1426 }
1427 EXPORT_SYMBOL(__skb_flow_dissect);
1428
1429 static siphash_key_t hashrnd __read_mostly;
1430 static __always_inline void __flow_hash_secret_init(void)
1431 {
1432         net_get_random_once(&hashrnd, sizeof(hashrnd));
1433 }
1434
1435 static const void *flow_keys_hash_start(const struct flow_keys *flow)
1436 {
1437         BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % SIPHASH_ALIGNMENT);
1438         return &flow->FLOW_KEYS_HASH_START_FIELD;
1439 }
1440
1441 static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
1442 {
1443         size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
1444
1445         BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
1446
1447         switch (flow->control.addr_type) {
1448         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1449                 diff -= sizeof(flow->addrs.v4addrs);
1450                 break;
1451         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1452                 diff -= sizeof(flow->addrs.v6addrs);
1453                 break;
1454         case FLOW_DISSECTOR_KEY_TIPC:
1455                 diff -= sizeof(flow->addrs.tipckey);
1456                 break;
1457         }
1458         return sizeof(*flow) - diff;
1459 }
1460
1461 __be32 flow_get_u32_src(const struct flow_keys *flow)
1462 {
1463         switch (flow->control.addr_type) {
1464         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1465                 return flow->addrs.v4addrs.src;
1466         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1467                 return (__force __be32)ipv6_addr_hash(
1468                         &flow->addrs.v6addrs.src);
1469         case FLOW_DISSECTOR_KEY_TIPC:
1470                 return flow->addrs.tipckey.key;
1471         default:
1472                 return 0;
1473         }
1474 }
1475 EXPORT_SYMBOL(flow_get_u32_src);
1476
1477 __be32 flow_get_u32_dst(const struct flow_keys *flow)
1478 {
1479         switch (flow->control.addr_type) {
1480         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1481                 return flow->addrs.v4addrs.dst;
1482         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1483                 return (__force __be32)ipv6_addr_hash(
1484                         &flow->addrs.v6addrs.dst);
1485         default:
1486                 return 0;
1487         }
1488 }
1489 EXPORT_SYMBOL(flow_get_u32_dst);
1490
1491 /* Sort the source and destination IP (and the ports if the IP are the same),
1492  * to have consistent hash within the two directions
1493  */
1494 static inline void __flow_hash_consistentify(struct flow_keys *keys)
1495 {
1496         int addr_diff, i;
1497
1498         switch (keys->control.addr_type) {
1499         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1500                 addr_diff = (__force u32)keys->addrs.v4addrs.dst -
1501                             (__force u32)keys->addrs.v4addrs.src;
1502                 if ((addr_diff < 0) ||
1503                     (addr_diff == 0 &&
1504                      ((__force u16)keys->ports.dst <
1505                       (__force u16)keys->ports.src))) {
1506                         swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
1507                         swap(keys->ports.src, keys->ports.dst);
1508                 }
1509                 break;
1510         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1511                 addr_diff = memcmp(&keys->addrs.v6addrs.dst,
1512                                    &keys->addrs.v6addrs.src,
1513                                    sizeof(keys->addrs.v6addrs.dst));
1514                 if ((addr_diff < 0) ||
1515                     (addr_diff == 0 &&
1516                      ((__force u16)keys->ports.dst <
1517                       (__force u16)keys->ports.src))) {
1518                         for (i = 0; i < 4; i++)
1519                                 swap(keys->addrs.v6addrs.src.s6_addr32[i],
1520                                      keys->addrs.v6addrs.dst.s6_addr32[i]);
1521                         swap(keys->ports.src, keys->ports.dst);
1522                 }
1523                 break;
1524         }
1525 }
1526
1527 static inline u32 __flow_hash_from_keys(struct flow_keys *keys,
1528                                         const siphash_key_t *keyval)
1529 {
1530         u32 hash;
1531
1532         __flow_hash_consistentify(keys);
1533
1534         hash = siphash(flow_keys_hash_start(keys),
1535                        flow_keys_hash_length(keys), keyval);
1536         if (!hash)
1537                 hash = 1;
1538
1539         return hash;
1540 }
1541
1542 u32 flow_hash_from_keys(struct flow_keys *keys)
1543 {
1544         __flow_hash_secret_init();
1545         return __flow_hash_from_keys(keys, &hashrnd);
1546 }
1547 EXPORT_SYMBOL(flow_hash_from_keys);
1548
1549 static inline u32 ___skb_get_hash(const struct sk_buff *skb,
1550                                   struct flow_keys *keys,
1551                                   const siphash_key_t *keyval)
1552 {
1553         skb_flow_dissect_flow_keys(skb, keys,
1554                                    FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1555
1556         return __flow_hash_from_keys(keys, keyval);
1557 }
1558
1559 struct _flow_keys_digest_data {
1560         __be16  n_proto;
1561         u8      ip_proto;
1562         u8      padding;
1563         __be32  ports;
1564         __be32  src;
1565         __be32  dst;
1566 };
1567
1568 void make_flow_keys_digest(struct flow_keys_digest *digest,
1569                            const struct flow_keys *flow)
1570 {
1571         struct _flow_keys_digest_data *data =
1572             (struct _flow_keys_digest_data *)digest;
1573
1574         BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
1575
1576         memset(digest, 0, sizeof(*digest));
1577
1578         data->n_proto = flow->basic.n_proto;
1579         data->ip_proto = flow->basic.ip_proto;
1580         data->ports = flow->ports.ports;
1581         data->src = flow->addrs.v4addrs.src;
1582         data->dst = flow->addrs.v4addrs.dst;
1583 }
1584 EXPORT_SYMBOL(make_flow_keys_digest);
1585
1586 static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
1587
1588 u32 __skb_get_hash_symmetric(const struct sk_buff *skb)
1589 {
1590         struct flow_keys keys;
1591
1592         __flow_hash_secret_init();
1593
1594         memset(&keys, 0, sizeof(keys));
1595         __skb_flow_dissect(NULL, skb, &flow_keys_dissector_symmetric,
1596                            &keys, NULL, 0, 0, 0,
1597                            FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1598
1599         return __flow_hash_from_keys(&keys, &hashrnd);
1600 }
1601 EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
1602
1603 /**
1604  * __skb_get_hash: calculate a flow hash
1605  * @skb: sk_buff to calculate flow hash from
1606  *
1607  * This function calculates a flow hash based on src/dst addresses
1608  * and src/dst port numbers.  Sets hash in skb to non-zero hash value
1609  * on success, zero indicates no valid hash.  Also, sets l4_hash in skb
1610  * if hash is a canonical 4-tuple hash over transport ports.
1611  */
1612 void __skb_get_hash(struct sk_buff *skb)
1613 {
1614         struct flow_keys keys;
1615         u32 hash;
1616
1617         __flow_hash_secret_init();
1618
1619         hash = ___skb_get_hash(skb, &keys, &hashrnd);
1620
1621         __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
1622 }
1623 EXPORT_SYMBOL(__skb_get_hash);
1624
1625 __u32 skb_get_hash_perturb(const struct sk_buff *skb,
1626                            const siphash_key_t *perturb)
1627 {
1628         struct flow_keys keys;
1629
1630         return ___skb_get_hash(skb, &keys, perturb);
1631 }
1632 EXPORT_SYMBOL(skb_get_hash_perturb);
1633
1634 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
1635                    const struct flow_keys_basic *keys, int hlen)
1636 {
1637         u32 poff = keys->control.thoff;
1638
1639         /* skip L4 headers for fragments after the first */
1640         if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
1641             !(keys->control.flags & FLOW_DIS_FIRST_FRAG))
1642                 return poff;
1643
1644         switch (keys->basic.ip_proto) {
1645         case IPPROTO_TCP: {
1646                 /* access doff as u8 to avoid unaligned access */
1647                 const u8 *doff;
1648                 u8 _doff;
1649
1650                 doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
1651                                             data, hlen, &_doff);
1652                 if (!doff)
1653                         return poff;
1654
1655                 poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
1656                 break;
1657         }
1658         case IPPROTO_UDP:
1659         case IPPROTO_UDPLITE:
1660                 poff += sizeof(struct udphdr);
1661                 break;
1662         /* For the rest, we do not really care about header
1663          * extensions at this point for now.
1664          */
1665         case IPPROTO_ICMP:
1666                 poff += sizeof(struct icmphdr);
1667                 break;
1668         case IPPROTO_ICMPV6:
1669                 poff += sizeof(struct icmp6hdr);
1670                 break;
1671         case IPPROTO_IGMP:
1672                 poff += sizeof(struct igmphdr);
1673                 break;
1674         case IPPROTO_DCCP:
1675                 poff += sizeof(struct dccp_hdr);
1676                 break;
1677         case IPPROTO_SCTP:
1678                 poff += sizeof(struct sctphdr);
1679                 break;
1680         }
1681
1682         return poff;
1683 }
1684
1685 /**
1686  * skb_get_poff - get the offset to the payload
1687  * @skb: sk_buff to get the payload offset from
1688  *
1689  * The function will get the offset to the payload as far as it could
1690  * be dissected.  The main user is currently BPF, so that we can dynamically
1691  * truncate packets without needing to push actual payload to the user
1692  * space and can analyze headers only, instead.
1693  */
1694 u32 skb_get_poff(const struct sk_buff *skb)
1695 {
1696         struct flow_keys_basic keys;
1697
1698         if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
1699                                               NULL, 0, 0, 0, 0))
1700                 return 0;
1701
1702         return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
1703 }
1704
1705 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
1706 {
1707         memset(keys, 0, sizeof(*keys));
1708
1709         memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
1710             sizeof(keys->addrs.v6addrs.src));
1711         memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
1712             sizeof(keys->addrs.v6addrs.dst));
1713         keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1714         keys->ports.src = fl6->fl6_sport;
1715         keys->ports.dst = fl6->fl6_dport;
1716         keys->keyid.keyid = fl6->fl6_gre_key;
1717         keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
1718         keys->basic.ip_proto = fl6->flowi6_proto;
1719
1720         return flow_hash_from_keys(keys);
1721 }
1722 EXPORT_SYMBOL(__get_hash_from_flowi6);
1723
1724 static const struct flow_dissector_key flow_keys_dissector_keys[] = {
1725         {
1726                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1727                 .offset = offsetof(struct flow_keys, control),
1728         },
1729         {
1730                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1731                 .offset = offsetof(struct flow_keys, basic),
1732         },
1733         {
1734                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1735                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1736         },
1737         {
1738                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1739                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1740         },
1741         {
1742                 .key_id = FLOW_DISSECTOR_KEY_TIPC,
1743                 .offset = offsetof(struct flow_keys, addrs.tipckey),
1744         },
1745         {
1746                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1747                 .offset = offsetof(struct flow_keys, ports),
1748         },
1749         {
1750                 .key_id = FLOW_DISSECTOR_KEY_VLAN,
1751                 .offset = offsetof(struct flow_keys, vlan),
1752         },
1753         {
1754                 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
1755                 .offset = offsetof(struct flow_keys, tags),
1756         },
1757         {
1758                 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
1759                 .offset = offsetof(struct flow_keys, keyid),
1760         },
1761 };
1762
1763 static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
1764         {
1765                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1766                 .offset = offsetof(struct flow_keys, control),
1767         },
1768         {
1769                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1770                 .offset = offsetof(struct flow_keys, basic),
1771         },
1772         {
1773                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1774                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1775         },
1776         {
1777                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1778                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1779         },
1780         {
1781                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1782                 .offset = offsetof(struct flow_keys, ports),
1783         },
1784 };
1785
1786 static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = {
1787         {
1788                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1789                 .offset = offsetof(struct flow_keys, control),
1790         },
1791         {
1792                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1793                 .offset = offsetof(struct flow_keys, basic),
1794         },
1795 };
1796
1797 struct flow_dissector flow_keys_dissector __read_mostly;
1798 EXPORT_SYMBOL(flow_keys_dissector);
1799
1800 struct flow_dissector flow_keys_basic_dissector __read_mostly;
1801 EXPORT_SYMBOL(flow_keys_basic_dissector);
1802
1803 static int __init init_default_flow_dissectors(void)
1804 {
1805         skb_flow_dissector_init(&flow_keys_dissector,
1806                                 flow_keys_dissector_keys,
1807                                 ARRAY_SIZE(flow_keys_dissector_keys));
1808         skb_flow_dissector_init(&flow_keys_dissector_symmetric,
1809                                 flow_keys_dissector_symmetric_keys,
1810                                 ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
1811         skb_flow_dissector_init(&flow_keys_basic_dissector,
1812                                 flow_keys_basic_dissector_keys,
1813                                 ARRAY_SIZE(flow_keys_basic_dissector_keys));
1814         return 0;
1815 }
1816
1817 core_initcall(init_default_flow_dissectors);