net/core/flow_dissector.c

   1 #include <linux/kernel.h>
   2 #include <linux/skbuff.h>
   3 #include <linux/export.h>
   4 #include <linux/ip.h>
   5 #include <linux/ipv6.h>
   6 #include <linux/if_vlan.h>
   7 #include <net/dsa.h>
   8 #include <net/ip.h>
   9 #include <net/ipv6.h>
  10 #include <net/gre.h>
  11 #include <net/pptp.h>
  12 #include <linux/igmp.h>
  13 #include <linux/icmp.h>
  14 #include <linux/sctp.h>
  15 #include <linux/dccp.h>
  16 #include <linux/if_tunnel.h>
  17 #include <linux/if_pppox.h>
  18 #include <linux/ppp_defs.h>
  19 #include <linux/stddef.h>
  20 #include <linux/if_ether.h>
  21 #include <linux/mpls.h>
  22 #include <linux/tcp.h>
  23 #include <net/flow_dissector.h>
  24 #include <scsi/fc/fc_fcoe.h>
  25
  26 static void dissector_set_key(struct flow_dissector *flow_dissector,
  27                               enum flow_dissector_key_id key_id)
  28 {
  29         flow_dissector->used_keys |= (1 << key_id);
  30 }
  31
  32 void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
  33                              const struct flow_dissector_key *key,
  34                              unsigned int key_count)
  35 {
  36         unsigned int i;
  37
  38         memset(flow_dissector, 0, sizeof(*flow_dissector));
  39
  40         for (i = 0; i < key_count; i++, key++) {
  41                 /* User should make sure that every key target offset is withing
  42                  * boundaries of unsigned short.
  43                  */
  44                 BUG_ON(key->offset > USHRT_MAX);
  45                 BUG_ON(dissector_uses_key(flow_dissector,
  46                                           key->key_id));
  47
  48                 dissector_set_key(flow_dissector, key->key_id);
  49                 flow_dissector->offset[key->key_id] = key->offset;
  50         }
  51
  52         /* Ensure that the dissector always includes control and basic key.
  53          * That way we are able to avoid handling lack of these in fast path.
  54          */
  55         BUG_ON(!dissector_uses_key(flow_dissector,
  56                                    FLOW_DISSECTOR_KEY_CONTROL));
  57         BUG_ON(!dissector_uses_key(flow_dissector,
  58                                    FLOW_DISSECTOR_KEY_BASIC));
  59 }
  60 EXPORT_SYMBOL(skb_flow_dissector_init);
  61
  62 /**
  63  * skb_flow_get_be16 - extract be16 entity
  64  * @skb: sk_buff to extract from
  65  * @poff: offset to extract at
  66  * @data: raw buffer pointer to the packet
  67  * @hlen: packet header length
  68  *
  69  * The function will try to retrieve a be32 entity at
  70  * offset poff
  71  */
  72 static __be16 skb_flow_get_be16(const struct sk_buff *skb, int poff,
  73                                 void *data, int hlen)
  74 {
  75         __be16 *u, _u;
  76
  77         u = __skb_header_pointer(skb, poff, sizeof(_u), data, hlen, &_u);
  78         if (u)
  79                 return *u;
  80
  81         return 0;
  82 }
  83
  84 /**
  85  * __skb_flow_get_ports - extract the upper layer ports and return them
  86  * @skb: sk_buff to extract the ports from
  87  * @thoff: transport header offset
  88  * @ip_proto: protocol for which to get port offset
  89  * @data: raw buffer pointer to the packet, if NULL use skb->data
  90  * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
  91  *
  92  * The function will try to retrieve the ports at offset thoff + poff where poff
  93  * is the protocol port offset returned from proto_ports_offset
  94  */
  95 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
  96                             void *data, int hlen)
  97 {
  98         int poff = proto_ports_offset(ip_proto);
  99
 100         if (!data) {
 101                 data = skb->data;
 102                 hlen = skb_headlen(skb);
 103         }
 104
 105         if (poff >= 0) {
 106                 __be32 *ports, _ports;
 107
 108                 ports = __skb_header_pointer(skb, thoff + poff,
 109                                              sizeof(_ports), data, hlen, &_ports);
 110                 if (ports)
 111                         return *ports;
 112         }
 113
 114         return 0;
 115 }
 116 EXPORT_SYMBOL(__skb_flow_get_ports);
 117
 118 enum flow_dissect_ret {
 119         FLOW_DISSECT_RET_OUT_GOOD,
 120         FLOW_DISSECT_RET_OUT_BAD,
 121         FLOW_DISSECT_RET_OUT_PROTO_AGAIN,
 122 };
 123
 124 static enum flow_dissect_ret
 125 __skb_flow_dissect_mpls(const struct sk_buff *skb,
 126                         struct flow_dissector *flow_dissector,
 127                         void *target_container, void *data, int nhoff, int hlen)
 128 {
 129         struct flow_dissector_key_keyid *key_keyid;
 130         struct mpls_label *hdr, _hdr[2];
 131         u32 entry, label;
 132
 133         if (!dissector_uses_key(flow_dissector,
 134                                 FLOW_DISSECTOR_KEY_MPLS_ENTROPY) &&
 135             !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS))
 136                 return FLOW_DISSECT_RET_OUT_GOOD;
 137
 138         hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
 139                                    hlen, &_hdr);
 140         if (!hdr)
 141                 return FLOW_DISSECT_RET_OUT_BAD;
 142
 143         entry = ntohl(hdr[0].entry);
 144         label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
 145
 146         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) {
 147                 struct flow_dissector_key_mpls *key_mpls;
 148
 149                 key_mpls = skb_flow_dissector_target(flow_dissector,
 150                                                      FLOW_DISSECTOR_KEY_MPLS,
 151                                                      target_container);
 152                 key_mpls->mpls_label = label;
 153                 key_mpls->mpls_ttl = (entry & MPLS_LS_TTL_MASK)
 154                                         >> MPLS_LS_TTL_SHIFT;
 155                 key_mpls->mpls_tc = (entry & MPLS_LS_TC_MASK)
 156                                         >> MPLS_LS_TC_SHIFT;
 157                 key_mpls->mpls_bos = (entry & MPLS_LS_S_MASK)
 158                                         >> MPLS_LS_S_SHIFT;
 159         }
 160
 161         if (label == MPLS_LABEL_ENTROPY) {
 162                 key_keyid = skb_flow_dissector_target(flow_dissector,
 163                                                       FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
 164                                                       target_container);
 165                 key_keyid->keyid = hdr[1].entry & htonl(MPLS_LS_LABEL_MASK);
 166         }
 167         return FLOW_DISSECT_RET_OUT_GOOD;
 168 }
 169
 170 static enum flow_dissect_ret
 171 __skb_flow_dissect_arp(const struct sk_buff *skb,
 172                        struct flow_dissector *flow_dissector,
 173                        void *target_container, void *data, int nhoff, int hlen)
 174 {
 175         struct flow_dissector_key_arp *key_arp;
 176         struct {
 177                 unsigned char ar_sha[ETH_ALEN];
 178                 unsigned char ar_sip[4];
 179                 unsigned char ar_tha[ETH_ALEN];
 180                 unsigned char ar_tip[4];
 181         } *arp_eth, _arp_eth;
 182         const struct arphdr *arp;
 183         struct arphdr _arp;
 184
 185         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP))
 186                 return FLOW_DISSECT_RET_OUT_GOOD;
 187
 188         arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
 189                                    hlen, &_arp);
 190         if (!arp)
 191                 return FLOW_DISSECT_RET_OUT_BAD;
 192
 193         if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
 194             arp->ar_pro != htons(ETH_P_IP) ||
 195             arp->ar_hln != ETH_ALEN ||
 196             arp->ar_pln != 4 ||
 197             (arp->ar_op != htons(ARPOP_REPLY) &&
 198              arp->ar_op != htons(ARPOP_REQUEST)))
 199                 return FLOW_DISSECT_RET_OUT_BAD;
 200
 201         arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
 202                                        sizeof(_arp_eth), data,
 203                                        hlen, &_arp_eth);
 204         if (!arp_eth)
 205                 return FLOW_DISSECT_RET_OUT_BAD;
 206
 207         key_arp = skb_flow_dissector_target(flow_dissector,
 208                                             FLOW_DISSECTOR_KEY_ARP,
 209                                             target_container);
 210
 211         memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip));
 212         memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip));
 213
 214         /* Only store the lower byte of the opcode;
 215          * this covers ARPOP_REPLY and ARPOP_REQUEST.
 216          */
 217         key_arp->op = ntohs(arp->ar_op) & 0xff;
 218
 219         ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
 220         ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
 221
 222         return FLOW_DISSECT_RET_OUT_GOOD;
 223 }
 224
 225 static enum flow_dissect_ret
 226 __skb_flow_dissect_gre(const struct sk_buff *skb,
 227                        struct flow_dissector_key_control *key_control,
 228                        struct flow_dissector *flow_dissector,
 229                        void *target_container, void *data,
 230                        __be16 *p_proto, int *p_nhoff, int *p_hlen,
 231                        unsigned int flags)
 232 {
 233         struct flow_dissector_key_keyid *key_keyid;
 234         struct gre_base_hdr *hdr, _hdr;
 235         int offset = 0;
 236         u16 gre_ver;
 237
 238         hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr),
 239                                    data, *p_hlen, &_hdr);
 240         if (!hdr)
 241                 return FLOW_DISSECT_RET_OUT_BAD;
 242
 243         /* Only look inside GRE without routing */
 244         if (hdr->flags & GRE_ROUTING)
 245                 return FLOW_DISSECT_RET_OUT_GOOD;
 246
 247         /* Only look inside GRE for version 0 and 1 */
 248         gre_ver = ntohs(hdr->flags & GRE_VERSION);
 249         if (gre_ver > 1)
 250                 return FLOW_DISSECT_RET_OUT_GOOD;
 251
 252         *p_proto = hdr->protocol;
 253         if (gre_ver) {
 254                 /* Version1 must be PPTP, and check the flags */
 255                 if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
 256                         return FLOW_DISSECT_RET_OUT_GOOD;
 257         }
 258
 259         offset += sizeof(struct gre_base_hdr);
 260
 261         if (hdr->flags & GRE_CSUM)
 262                 offset += sizeof(((struct gre_full_hdr *) 0)->csum) +
 263                           sizeof(((struct gre_full_hdr *) 0)->reserved1);
 264
 265         if (hdr->flags & GRE_KEY) {
 266                 const __be32 *keyid;
 267                 __be32 _keyid;
 268
 269                 keyid = __skb_header_pointer(skb, *p_nhoff + offset,
 270                                              sizeof(_keyid),
 271                                              data, *p_hlen, &_keyid);
 272                 if (!keyid)
 273                         return FLOW_DISSECT_RET_OUT_BAD;
 274
 275                 if (dissector_uses_key(flow_dissector,
 276                                        FLOW_DISSECTOR_KEY_GRE_KEYID)) {
 277                         key_keyid = skb_flow_dissector_target(flow_dissector,
 278                                                               FLOW_DISSECTOR_KEY_GRE_KEYID,
 279                                                               target_container);
 280                         if (gre_ver == 0)
 281                                 key_keyid->keyid = *keyid;
 282                         else
 283                                 key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
 284                 }
 285                 offset += sizeof(((struct gre_full_hdr *) 0)->key);
 286         }
 287
 288         if (hdr->flags & GRE_SEQ)
 289                 offset += sizeof(((struct pptp_gre_header *) 0)->seq);
 290
 291         if (gre_ver == 0) {
 292                 if (*p_proto == htons(ETH_P_TEB)) {
 293                         const struct ethhdr *eth;
 294                         struct ethhdr _eth;
 295
 296                         eth = __skb_header_pointer(skb, *p_nhoff + offset,
 297                                                    sizeof(_eth),
 298                                                    data, *p_hlen, &_eth);
 299                         if (!eth)
 300                                 return FLOW_DISSECT_RET_OUT_BAD;
 301                         *p_proto = eth->h_proto;
 302                         offset += sizeof(*eth);
 303
 304                         /* Cap headers that we access via pointers at the
 305                          * end of the Ethernet header as our maximum alignment
 306                          * at that point is only 2 bytes.
 307                          */
 308                         if (NET_IP_ALIGN)
 309                                 *p_hlen = *p_nhoff + offset;
 310                 }
 311         } else { /* version 1, must be PPTP */
 312                 u8 _ppp_hdr[PPP_HDRLEN];
 313                 u8 *ppp_hdr;
 314
 315                 if (hdr->flags & GRE_ACK)
 316                         offset += sizeof(((struct pptp_gre_header *) 0)->ack);
 317
 318                 ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset,
 319                                                sizeof(_ppp_hdr),
 320                                                data, *p_hlen, _ppp_hdr);
 321                 if (!ppp_hdr)
 322                         return FLOW_DISSECT_RET_OUT_BAD;
 323
 324                 switch (PPP_PROTOCOL(ppp_hdr)) {
 325                 case PPP_IP:
 326                         *p_proto = htons(ETH_P_IP);
 327                         break;
 328                 case PPP_IPV6:
 329                         *p_proto = htons(ETH_P_IPV6);
 330                         break;
 331                 default:
 332                         /* Could probably catch some more like MPLS */
 333                         break;
 334                 }
 335
 336                 offset += PPP_HDRLEN;
 337         }
 338
 339         *p_nhoff += offset;
 340         key_control->flags |= FLOW_DIS_ENCAPSULATION;
 341         if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 342                 return FLOW_DISSECT_RET_OUT_GOOD;
 343
 344         return FLOW_DISSECT_RET_OUT_PROTO_AGAIN;
 345 }
 346
 347 static void
 348 __skb_flow_dissect_tcp(const struct sk_buff *skb,
 349                        struct flow_dissector *flow_dissector,
 350                        void *target_container, void *data, int thoff, int hlen)
 351 {
 352         struct flow_dissector_key_tcp *key_tcp;
 353         struct tcphdr *th, _th;
 354
 355         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
 356                 return;
 357
 358         th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
 359         if (!th)
 360                 return;
 361
 362         if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
 363                 return;
 364
 365         key_tcp = skb_flow_dissector_target(flow_dissector,
 366                                             FLOW_DISSECTOR_KEY_TCP,
 367                                             target_container);
 368         key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
 369 }
 370
 371 static void
 372 __skb_flow_dissect_ipv4(const struct sk_buff *skb,
 373                         struct flow_dissector *flow_dissector,
 374                         void *target_container, void *data, const struct iphdr *iph)
 375 {
 376         struct flow_dissector_key_ip *key_ip;
 377
 378         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
 379                 return;
 380
 381         key_ip = skb_flow_dissector_target(flow_dissector,
 382                                            FLOW_DISSECTOR_KEY_IP,
 383                                            target_container);
 384         key_ip->tos = iph->tos;
 385         key_ip->ttl = iph->ttl;
 386 }
 387
 388 static void
 389 __skb_flow_dissect_ipv6(const struct sk_buff *skb,
 390                         struct flow_dissector *flow_dissector,
 391                         void *target_container, void *data, const struct ipv6hdr *iph)
 392 {
 393         struct flow_dissector_key_ip *key_ip;
 394
 395         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
 396                 return;
 397
 398         key_ip = skb_flow_dissector_target(flow_dissector,
 399                                            FLOW_DISSECTOR_KEY_IP,
 400                                            target_container);
 401         key_ip->tos = ipv6_get_dsfield(iph);
 402         key_ip->ttl = iph->hop_limit;
 403 }
 404
 405 /**
 406  * __skb_flow_dissect - extract the flow_keys struct and return it
 407  * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
 408  * @flow_dissector: list of keys to dissect
 409  * @target_container: target structure to put dissected values into
 410  * @data: raw buffer pointer to the packet, if NULL use skb->data
 411  * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
 412  * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
 413  * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
 414  *
 415  * The function will try to retrieve individual keys into target specified
 416  * by flow_dissector from either the skbuff or a raw buffer specified by the
 417  * rest parameters.
 418  *
 419  * Caller must take care of zeroing target container memory.
 420  */
 421 bool __skb_flow_dissect(const struct sk_buff *skb,
 422                         struct flow_dissector *flow_dissector,
 423                         void *target_container,
 424                         void *data, __be16 proto, int nhoff, int hlen,
 425                         unsigned int flags)
 426 {
 427         struct flow_dissector_key_control *key_control;
 428         struct flow_dissector_key_basic *key_basic;
 429         struct flow_dissector_key_addrs *key_addrs;
 430         struct flow_dissector_key_ports *key_ports;
 431         struct flow_dissector_key_icmp *key_icmp;
 432         struct flow_dissector_key_tags *key_tags;
 433         struct flow_dissector_key_vlan *key_vlan;
 434         bool skip_vlan = false;
 435         u8 ip_proto = 0;
 436         bool ret;
 437
 438         if (!data) {
 439                 data = skb->data;
 440                 proto = skb_vlan_tag_present(skb) ?
 441                          skb->vlan_proto : skb->protocol;
 442                 nhoff = skb_network_offset(skb);
 443                 hlen = skb_headlen(skb);
 444 #if IS_ENABLED(CONFIG_NET_DSA)
 445                 if (unlikely(skb->dev && netdev_uses_dsa(skb->dev))) {
 446                         const struct dsa_device_ops *ops;
 447                         int offset;
 448
 449                         ops = skb->dev->dsa_ptr->tag_ops;
 450                         if (ops->flow_dissect &&
 451                             !ops->flow_dissect(skb, &proto, &offset)) {
 452                                 hlen -= offset;
 453                                 nhoff += offset;
 454                         }
 455                 }
 456 #endif
 457         }
 458
 459         /* It is ensured by skb_flow_dissector_init() that control key will
 460          * be always present.
 461          */
 462         key_control = skb_flow_dissector_target(flow_dissector,
 463                                                 FLOW_DISSECTOR_KEY_CONTROL,
 464                                                 target_container);
 465
 466         /* It is ensured by skb_flow_dissector_init() that basic key will
 467          * be always present.
 468          */
 469         key_basic = skb_flow_dissector_target(flow_dissector,
 470                                               FLOW_DISSECTOR_KEY_BASIC,
 471                                               target_container);
 472
 473         if (dissector_uses_key(flow_dissector,
 474                                FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
 475                 struct ethhdr *eth = eth_hdr(skb);
 476                 struct flow_dissector_key_eth_addrs *key_eth_addrs;
 477
 478                 key_eth_addrs = skb_flow_dissector_target(flow_dissector,
 479                                                           FLOW_DISSECTOR_KEY_ETH_ADDRS,
 480                                                           target_container);
 481                 memcpy(key_eth_addrs, &eth->h_dest, sizeof(*key_eth_addrs));
 482         }
 483
 484 proto_again:
 485         switch (proto) {
 486         case htons(ETH_P_IP): {
 487                 const struct iphdr *iph;
 488                 struct iphdr _iph;
 489 ip:
 490                 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
 491                 if (!iph || iph->ihl < 5)
 492                         goto out_bad;
 493                 nhoff += iph->ihl * 4;
 494
 495                 ip_proto = iph->protocol;
 496
 497                 if (dissector_uses_key(flow_dissector,
 498                                        FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
 499                         key_addrs = skb_flow_dissector_target(flow_dissector,
 500                                                               FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 501                                                               target_container);
 502
 503                         memcpy(&key_addrs->v4addrs, &iph->saddr,
 504                                sizeof(key_addrs->v4addrs));
 505                         key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 506                 }
 507
 508                 if (ip_is_fragment(iph)) {
 509                         key_control->flags |= FLOW_DIS_IS_FRAGMENT;
 510
 511                         if (iph->frag_off & htons(IP_OFFSET)) {
 512                                 goto out_good;
 513                         } else {
 514                                 key_control->flags |= FLOW_DIS_FIRST_FRAG;
 515                                 if (!(flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG))
 516                                         goto out_good;
 517                         }
 518                 }
 519
 520                 __skb_flow_dissect_ipv4(skb, flow_dissector,
 521                                         target_container, data, iph);
 522
 523                 if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
 524                         goto out_good;
 525
 526                 break;
 527         }
 528         case htons(ETH_P_IPV6): {
 529                 const struct ipv6hdr *iph;
 530                 struct ipv6hdr _iph;
 531
 532 ipv6:
 533                 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
 534                 if (!iph)
 535                         goto out_bad;
 536
 537                 ip_proto = iph->nexthdr;
 538                 nhoff += sizeof(struct ipv6hdr);
 539
 540                 if (dissector_uses_key(flow_dissector,
 541                                        FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
 542                         key_addrs = skb_flow_dissector_target(flow_dissector,
 543                                                               FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 544                                                               target_container);
 545
 546                         memcpy(&key_addrs->v6addrs, &iph->saddr,
 547                                sizeof(key_addrs->v6addrs));
 548                         key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 549                 }
 550
 551                 if ((dissector_uses_key(flow_dissector,
 552                                         FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
 553                      (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
 554                     ip6_flowlabel(iph)) {
 555                         __be32 flow_label = ip6_flowlabel(iph);
 556
 557                         if (dissector_uses_key(flow_dissector,
 558                                                FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
 559                                 key_tags = skb_flow_dissector_target(flow_dissector,
 560                                                                      FLOW_DISSECTOR_KEY_FLOW_LABEL,
 561                                                                      target_container);
 562                                 key_tags->flow_label = ntohl(flow_label);
 563                         }
 564                         if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)
 565                                 goto out_good;
 566                 }
 567
 568                 __skb_flow_dissect_ipv6(skb, flow_dissector,
 569                                         target_container, data, iph);
 570
 571                 if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
 572                         goto out_good;
 573
 574                 break;
 575         }
 576         case htons(ETH_P_8021AD):
 577         case htons(ETH_P_8021Q): {
 578                 const struct vlan_hdr *vlan;
 579                 struct vlan_hdr _vlan;
 580                 bool vlan_tag_present = skb && skb_vlan_tag_present(skb);
 581
 582                 if (vlan_tag_present)
 583                         proto = skb->protocol;
 584
 585                 if (!vlan_tag_present || eth_type_vlan(skb->protocol)) {
 586                         vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
 587                                                     data, hlen, &_vlan);
 588                         if (!vlan)
 589                                 goto out_bad;
 590                         proto = vlan->h_vlan_encapsulated_proto;
 591                         nhoff += sizeof(*vlan);
 592                         if (skip_vlan)
 593                                 goto proto_again;
 594                 }
 595
 596                 skip_vlan = true;
 597                 if (dissector_uses_key(flow_dissector,
 598                                        FLOW_DISSECTOR_KEY_VLAN)) {
 599                         key_vlan = skb_flow_dissector_target(flow_dissector,
 600                                                              FLOW_DISSECTOR_KEY_VLAN,
 601                                                              target_container);
 602
 603                         if (vlan_tag_present) {
 604                                 key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
 605                                 key_vlan->vlan_priority =
 606                                         (skb_vlan_tag_get_prio(skb) >> VLAN_PRIO_SHIFT);
 607                         } else {
 608                                 key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
 609                                         VLAN_VID_MASK;
 610                                 key_vlan->vlan_priority =
 611                                         (ntohs(vlan->h_vlan_TCI) &
 612                                          VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
 613                         }
 614                 }
 615
 616                 goto proto_again;
 617         }
 618         case htons(ETH_P_PPP_SES): {
 619                 struct {
 620                         struct pppoe_hdr hdr;
 621                         __be16 proto;
 622                 } *hdr, _hdr;
 623                 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
 624                 if (!hdr)
 625                         goto out_bad;
 626                 proto = hdr->proto;
 627                 nhoff += PPPOE_SES_HLEN;
 628                 switch (proto) {
 629                 case htons(PPP_IP):
 630                         goto ip;
 631                 case htons(PPP_IPV6):
 632                         goto ipv6;
 633                 default:
 634                         goto out_bad;
 635                 }
 636         }
 637         case htons(ETH_P_TIPC): {
 638                 struct {
 639                         __be32 pre[3];
 640                         __be32 srcnode;
 641                 } *hdr, _hdr;
 642                 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
 643                 if (!hdr)
 644                         goto out_bad;
 645
 646                 if (dissector_uses_key(flow_dissector,
 647                                        FLOW_DISSECTOR_KEY_TIPC_ADDRS)) {
 648                         key_addrs = skb_flow_dissector_target(flow_dissector,
 649                                                               FLOW_DISSECTOR_KEY_TIPC_ADDRS,
 650                                                               target_container);
 651                         key_addrs->tipcaddrs.srcnode = hdr->srcnode;
 652                         key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC_ADDRS;
 653                 }
 654                 goto out_good;
 655         }
 656
 657         case htons(ETH_P_MPLS_UC):
 658         case htons(ETH_P_MPLS_MC):
 659 mpls:
 660                 switch (__skb_flow_dissect_mpls(skb, flow_dissector,
 661                                                 target_container, data,
 662                                                 nhoff, hlen)) {
 663                 case FLOW_DISSECT_RET_OUT_GOOD:
 664                         goto out_good;
 665                 case FLOW_DISSECT_RET_OUT_BAD:
 666                 default:
 667                         goto out_bad;
 668                 }
 669         case htons(ETH_P_FCOE):
 670                 if ((hlen - nhoff) < FCOE_HEADER_LEN)
 671                         goto out_bad;
 672
 673                 nhoff += FCOE_HEADER_LEN;
 674                 goto out_good;
 675
 676         case htons(ETH_P_ARP):
 677         case htons(ETH_P_RARP):
 678                 switch (__skb_flow_dissect_arp(skb, flow_dissector,
 679                                                target_container, data,
 680                                                nhoff, hlen)) {
 681                 case FLOW_DISSECT_RET_OUT_GOOD:
 682                         goto out_good;
 683                 case FLOW_DISSECT_RET_OUT_BAD:
 684                 default:
 685                         goto out_bad;
 686                 }
 687         default:
 688                 goto out_bad;
 689         }
 690
 691 ip_proto_again:
 692         switch (ip_proto) {
 693         case IPPROTO_GRE:
 694                 switch (__skb_flow_dissect_gre(skb, key_control, flow_dissector,
 695                                                target_container, data,
 696                                                &proto, &nhoff, &hlen, flags)) {
 697                 case FLOW_DISSECT_RET_OUT_GOOD:
 698                         goto out_good;
 699                 case FLOW_DISSECT_RET_OUT_BAD:
 700                         goto out_bad;
 701                 case FLOW_DISSECT_RET_OUT_PROTO_AGAIN:
 702                         goto proto_again;
 703                 }
 704         case NEXTHDR_HOP:
 705         case NEXTHDR_ROUTING:
 706         case NEXTHDR_DEST: {
 707                 u8 _opthdr[2], *opthdr;
 708
 709                 if (proto != htons(ETH_P_IPV6))
 710                         break;
 711
 712                 opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
 713                                               data, hlen, &_opthdr);
 714                 if (!opthdr)
 715                         goto out_bad;
 716
 717                 ip_proto = opthdr[0];
 718                 nhoff += (opthdr[1] + 1) << 3;
 719
 720                 goto ip_proto_again;
 721         }
 722         case NEXTHDR_FRAGMENT: {
 723                 struct frag_hdr _fh, *fh;
 724
 725                 if (proto != htons(ETH_P_IPV6))
 726                         break;
 727
 728                 fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
 729                                           data, hlen, &_fh);
 730
 731                 if (!fh)
 732                         goto out_bad;
 733
 734                 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
 735
 736                 nhoff += sizeof(_fh);
 737                 ip_proto = fh->nexthdr;
 738
 739                 if (!(fh->frag_off & htons(IP6_OFFSET))) {
 740                         key_control->flags |= FLOW_DIS_FIRST_FRAG;
 741                         if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG)
 742                                 goto ip_proto_again;
 743                 }
 744                 goto out_good;
 745         }
 746         case IPPROTO_IPIP:
 747                 proto = htons(ETH_P_IP);
 748
 749                 key_control->flags |= FLOW_DIS_ENCAPSULATION;
 750                 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 751                         goto out_good;
 752
 753                 goto ip;
 754         case IPPROTO_IPV6:
 755                 proto = htons(ETH_P_IPV6);
 756
 757                 key_control->flags |= FLOW_DIS_ENCAPSULATION;
 758                 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 759                         goto out_good;
 760
 761                 goto ipv6;
 762         case IPPROTO_MPLS:
 763                 proto = htons(ETH_P_MPLS_UC);
 764                 goto mpls;
 765         case IPPROTO_TCP:
 766                 __skb_flow_dissect_tcp(skb, flow_dissector, target_container,
 767                                        data, nhoff, hlen);
 768                 break;
 769         default:
 770                 break;
 771         }
 772
 773         if (dissector_uses_key(flow_dissector,
 774                                FLOW_DISSECTOR_KEY_PORTS)) {
 775                 key_ports = skb_flow_dissector_target(flow_dissector,
 776                                                       FLOW_DISSECTOR_KEY_PORTS,
 777                                                       target_container);
 778                 key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
 779                                                         data, hlen);
 780         }
 781
 782         if (dissector_uses_key(flow_dissector,
 783                                FLOW_DISSECTOR_KEY_ICMP)) {
 784                 key_icmp = skb_flow_dissector_target(flow_dissector,
 785                                                      FLOW_DISSECTOR_KEY_ICMP,
 786                                                      target_container);
 787                 key_icmp->icmp = skb_flow_get_be16(skb, nhoff, data, hlen);
 788         }
 789
 790 out_good:
 791         ret = true;
 792
 793         key_control->thoff = (u16)nhoff;
 794 out:
 795         key_basic->n_proto = proto;
 796         key_basic->ip_proto = ip_proto;
 797
 798         return ret;
 799
 800 out_bad:
 801         ret = false;
 802         key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
 803         goto out;
 804 }
 805 EXPORT_SYMBOL(__skb_flow_dissect);
 806
 807 static u32 hashrnd __read_mostly;
 808 static __always_inline void __flow_hash_secret_init(void)
 809 {
 810         net_get_random_once(&hashrnd, sizeof(hashrnd));
 811 }
 812
 813 static __always_inline u32 __flow_hash_words(const u32 *words, u32 length,
 814                                              u32 keyval)
 815 {
 816         return jhash2(words, length, keyval);
 817 }
 818
 819 static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow)
 820 {
 821         const void *p = flow;
 822
 823         BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32));
 824         return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET);
 825 }
 826
 827 static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
 828 {
 829         size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
 830         BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
 831         BUILD_BUG_ON(offsetof(typeof(*flow), addrs) !=
 832                      sizeof(*flow) - sizeof(flow->addrs));
 833
 834         switch (flow->control.addr_type) {
 835         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
 836                 diff -= sizeof(flow->addrs.v4addrs);
 837                 break;
 838         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
 839                 diff -= sizeof(flow->addrs.v6addrs);
 840                 break;
 841         case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
 842                 diff -= sizeof(flow->addrs.tipcaddrs);
 843                 break;
 844         }
 845         return (sizeof(*flow) - diff) / sizeof(u32);
 846 }
 847
 848 __be32 flow_get_u32_src(const struct flow_keys *flow)
 849 {
 850         switch (flow->control.addr_type) {
 851         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
 852                 return flow->addrs.v4addrs.src;
 853         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
 854                 return (__force __be32)ipv6_addr_hash(
 855                         &flow->addrs.v6addrs.src);
 856         case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
 857                 return flow->addrs.tipcaddrs.srcnode;
 858         default:
 859                 return 0;
 860         }
 861 }
 862 EXPORT_SYMBOL(flow_get_u32_src);
 863
 864 __be32 flow_get_u32_dst(const struct flow_keys *flow)
 865 {
 866         switch (flow->control.addr_type) {
 867         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
 868                 return flow->addrs.v4addrs.dst;
 869         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
 870                 return (__force __be32)ipv6_addr_hash(
 871                         &flow->addrs.v6addrs.dst);
 872         default:
 873                 return 0;
 874         }
 875 }
 876 EXPORT_SYMBOL(flow_get_u32_dst);
 877
 878 static inline void __flow_hash_consistentify(struct flow_keys *keys)
 879 {
 880         int addr_diff, i;
 881
 882         switch (keys->control.addr_type) {
 883         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
 884                 addr_diff = (__force u32)keys->addrs.v4addrs.dst -
 885                             (__force u32)keys->addrs.v4addrs.src;
 886                 if ((addr_diff < 0) ||
 887                     (addr_diff == 0 &&
 888                      ((__force u16)keys->ports.dst <
 889                       (__force u16)keys->ports.src))) {
 890                         swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
 891                         swap(keys->ports.src, keys->ports.dst);
 892                 }
 893                 break;
 894         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
 895                 addr_diff = memcmp(&keys->addrs.v6addrs.dst,
 896                                    &keys->addrs.v6addrs.src,
 897                                    sizeof(keys->addrs.v6addrs.dst));
 898                 if ((addr_diff < 0) ||
 899                     (addr_diff == 0 &&
 900                      ((__force u16)keys->ports.dst <
 901                       (__force u16)keys->ports.src))) {
 902                         for (i = 0; i < 4; i++)
 903                                 swap(keys->addrs.v6addrs.src.s6_addr32[i],
 904                                      keys->addrs.v6addrs.dst.s6_addr32[i]);
 905                         swap(keys->ports.src, keys->ports.dst);
 906                 }
 907                 break;
 908         }
 909 }
 910
 911 static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval)
 912 {
 913         u32 hash;
 914
 915         __flow_hash_consistentify(keys);
 916
 917         hash = __flow_hash_words(flow_keys_hash_start(keys),
 918                                  flow_keys_hash_length(keys), keyval);
 919         if (!hash)
 920                 hash = 1;
 921
 922         return hash;
 923 }
 924
 925 u32 flow_hash_from_keys(struct flow_keys *keys)
 926 {
 927         __flow_hash_secret_init();
 928         return __flow_hash_from_keys(keys, hashrnd);
 929 }
 930 EXPORT_SYMBOL(flow_hash_from_keys);
 931
 932 static inline u32 ___skb_get_hash(const struct sk_buff *skb,
 933                                   struct flow_keys *keys, u32 keyval)
 934 {
 935         skb_flow_dissect_flow_keys(skb, keys,
 936                                    FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
 937
 938         return __flow_hash_from_keys(keys, keyval);
 939 }
 940
 941 struct _flow_keys_digest_data {
 942         __be16  n_proto;
 943         u8      ip_proto;
 944         u8      padding;
 945         __be32  ports;
 946         __be32  src;
 947         __be32  dst;
 948 };
 949
 950 void make_flow_keys_digest(struct flow_keys_digest *digest,
 951                            const struct flow_keys *flow)
 952 {
 953         struct _flow_keys_digest_data *data =
 954             (struct _flow_keys_digest_data *)digest;
 955
 956         BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
 957
 958         memset(digest, 0, sizeof(*digest));
 959
 960         data->n_proto = flow->basic.n_proto;
 961         data->ip_proto = flow->basic.ip_proto;
 962         data->ports = flow->ports.ports;
 963         data->src = flow->addrs.v4addrs.src;
 964         data->dst = flow->addrs.v4addrs.dst;
 965 }
 966 EXPORT_SYMBOL(make_flow_keys_digest);
 967
 968 static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
 969
 970 u32 __skb_get_hash_symmetric(const struct sk_buff *skb)
 971 {
 972         struct flow_keys keys;
 973
 974         __flow_hash_secret_init();
 975
 976         memset(&keys, 0, sizeof(keys));
 977         __skb_flow_dissect(skb, &flow_keys_dissector_symmetric, &keys,
 978                            NULL, 0, 0, 0,
 979                            FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
 980
 981         return __flow_hash_from_keys(&keys, hashrnd);
 982 }
 983 EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
 984
 985 /**
 986  * __skb_get_hash: calculate a flow hash
 987  * @skb: sk_buff to calculate flow hash from
 988  *
 989  * This function calculates a flow hash based on src/dst addresses
 990  * and src/dst port numbers.  Sets hash in skb to non-zero hash value
 991  * on success, zero indicates no valid hash.  Also, sets l4_hash in skb
 992  * if hash is a canonical 4-tuple hash over transport ports.
 993  */
 994 void __skb_get_hash(struct sk_buff *skb)
 995 {
 996         struct flow_keys keys;
 997         u32 hash;
 998
 999         __flow_hash_secret_init();
1000
1001         hash = ___skb_get_hash(skb, &keys, hashrnd);
1002
1003         __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
1004 }
1005 EXPORT_SYMBOL(__skb_get_hash);
1006
1007 __u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb)
1008 {
1009         struct flow_keys keys;
1010
1011         return ___skb_get_hash(skb, &keys, perturb);
1012 }
1013 EXPORT_SYMBOL(skb_get_hash_perturb);
1014
1015 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
1016                    const struct flow_keys *keys, int hlen)
1017 {
1018         u32 poff = keys->control.thoff;
1019
1020         /* skip L4 headers for fragments after the first */
1021         if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
1022             !(keys->control.flags & FLOW_DIS_FIRST_FRAG))
1023                 return poff;
1024
1025         switch (keys->basic.ip_proto) {
1026         case IPPROTO_TCP: {
1027                 /* access doff as u8 to avoid unaligned access */
1028                 const u8 *doff;
1029                 u8 _doff;
1030
1031                 doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
1032                                             data, hlen, &_doff);
1033                 if (!doff)
1034                         return poff;
1035
1036                 poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
1037                 break;
1038         }
1039         case IPPROTO_UDP:
1040         case IPPROTO_UDPLITE:
1041                 poff += sizeof(struct udphdr);
1042                 break;
1043         /* For the rest, we do not really care about header
1044          * extensions at this point for now.
1045          */
1046         case IPPROTO_ICMP:
1047                 poff += sizeof(struct icmphdr);
1048                 break;
1049         case IPPROTO_ICMPV6:
1050                 poff += sizeof(struct icmp6hdr);
1051                 break;
1052         case IPPROTO_IGMP:
1053                 poff += sizeof(struct igmphdr);
1054                 break;
1055         case IPPROTO_DCCP:
1056                 poff += sizeof(struct dccp_hdr);
1057                 break;
1058         case IPPROTO_SCTP:
1059                 poff += sizeof(struct sctphdr);
1060                 break;
1061         }
1062
1063         return poff;
1064 }
1065
1066 /**
1067  * skb_get_poff - get the offset to the payload
1068  * @skb: sk_buff to get the payload offset from
1069  *
1070  * The function will get the offset to the payload as far as it could
1071  * be dissected.  The main user is currently BPF, so that we can dynamically
1072  * truncate packets without needing to push actual payload to the user
1073  * space and can analyze headers only, instead.
1074  */
1075 u32 skb_get_poff(const struct sk_buff *skb)
1076 {
1077         struct flow_keys keys;
1078
1079         if (!skb_flow_dissect_flow_keys(skb, &keys, 0))
1080                 return 0;
1081
1082         return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
1083 }
1084
1085 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
1086 {
1087         memset(keys, 0, sizeof(*keys));
1088
1089         memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
1090             sizeof(keys->addrs.v6addrs.src));
1091         memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
1092             sizeof(keys->addrs.v6addrs.dst));
1093         keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1094         keys->ports.src = fl6->fl6_sport;
1095         keys->ports.dst = fl6->fl6_dport;
1096         keys->keyid.keyid = fl6->fl6_gre_key;
1097         keys->tags.flow_label = (__force u32)fl6->flowlabel;
1098         keys->basic.ip_proto = fl6->flowi6_proto;
1099
1100         return flow_hash_from_keys(keys);
1101 }
1102 EXPORT_SYMBOL(__get_hash_from_flowi6);
1103
1104 __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys)
1105 {
1106         memset(keys, 0, sizeof(*keys));
1107
1108         keys->addrs.v4addrs.src = fl4->saddr;
1109         keys->addrs.v4addrs.dst = fl4->daddr;
1110         keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
1111         keys->ports.src = fl4->fl4_sport;
1112         keys->ports.dst = fl4->fl4_dport;
1113         keys->keyid.keyid = fl4->fl4_gre_key;
1114         keys->basic.ip_proto = fl4->flowi4_proto;
1115
1116         return flow_hash_from_keys(keys);
1117 }
1118 EXPORT_SYMBOL(__get_hash_from_flowi4);
1119
1120 static const struct flow_dissector_key flow_keys_dissector_keys[] = {
1121         {
1122                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1123                 .offset = offsetof(struct flow_keys, control),
1124         },
1125         {
1126                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1127                 .offset = offsetof(struct flow_keys, basic),
1128         },
1129         {
1130                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1131                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1132         },
1133         {
1134                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1135                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1136         },
1137         {
1138                 .key_id = FLOW_DISSECTOR_KEY_TIPC_ADDRS,
1139                 .offset = offsetof(struct flow_keys, addrs.tipcaddrs),
1140         },
1141         {
1142                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1143                 .offset = offsetof(struct flow_keys, ports),
1144         },
1145         {
1146                 .key_id = FLOW_DISSECTOR_KEY_VLAN,
1147                 .offset = offsetof(struct flow_keys, vlan),
1148         },
1149         {
1150                 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
1151                 .offset = offsetof(struct flow_keys, tags),
1152         },
1153         {
1154                 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
1155                 .offset = offsetof(struct flow_keys, keyid),
1156         },
1157 };
1158
1159 static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
1160         {
1161                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1162                 .offset = offsetof(struct flow_keys, control),
1163         },
1164         {
1165                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1166                 .offset = offsetof(struct flow_keys, basic),
1167         },
1168         {
1169                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1170                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1171         },
1172         {
1173                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1174                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1175         },
1176         {
1177                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1178                 .offset = offsetof(struct flow_keys, ports),
1179         },
1180 };
1181
1182 static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = {
1183         {
1184                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1185                 .offset = offsetof(struct flow_keys, control),
1186         },
1187         {
1188                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1189                 .offset = offsetof(struct flow_keys, basic),
1190         },
1191 };
1192
1193 struct flow_dissector flow_keys_dissector __read_mostly;
1194 EXPORT_SYMBOL(flow_keys_dissector);
1195
1196 struct flow_dissector flow_keys_buf_dissector __read_mostly;
1197
1198 static int __init init_default_flow_dissectors(void)
1199 {
1200         skb_flow_dissector_init(&flow_keys_dissector,
1201                                 flow_keys_dissector_keys,
1202                                 ARRAY_SIZE(flow_keys_dissector_keys));
1203         skb_flow_dissector_init(&flow_keys_dissector_symmetric,
1204                                 flow_keys_dissector_symmetric_keys,
1205                                 ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
1206         skb_flow_dissector_init(&flow_keys_buf_dissector,
1207                                 flow_keys_buf_dissector_keys,
1208                                 ARRAY_SIZE(flow_keys_buf_dissector_keys));
1209         return 0;
1210 }
1211
1212 core_initcall(init_default_flow_dissectors);