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/ip.h>
   8 #include <net/ipv6.h>
   9 #include <net/gre.h>
  10 #include <net/pptp.h>
  11 #include <linux/igmp.h>
  12 #include <linux/icmp.h>
  13 #include <linux/sctp.h>
  14 #include <linux/dccp.h>
  15 #include <linux/if_tunnel.h>
  16 #include <linux/if_pppox.h>
  17 #include <linux/ppp_defs.h>
  18 #include <linux/stddef.h>
  19 #include <linux/if_ether.h>
  20 #include <linux/mpls.h>
  21 #include <linux/tcp.h>
  22 #include <net/flow_dissector.h>
  23 #include <scsi/fc/fc_fcoe.h>
  24
  25 static void dissector_set_key(struct flow_dissector *flow_dissector,
  26                               enum flow_dissector_key_id key_id)
  27 {
  28         flow_dissector->used_keys |= (1 << key_id);
  29 }
  30
  31 void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
  32                              const struct flow_dissector_key *key,
  33                              unsigned int key_count)
  34 {
  35         unsigned int i;
  36
  37         memset(flow_dissector, 0, sizeof(*flow_dissector));
  38
  39         for (i = 0; i < key_count; i++, key++) {
  40                 /* User should make sure that every key target offset is withing
  41                  * boundaries of unsigned short.
  42                  */
  43                 BUG_ON(key->offset > USHRT_MAX);
  44                 BUG_ON(dissector_uses_key(flow_dissector,
  45                                           key->key_id));
  46
  47                 dissector_set_key(flow_dissector, key->key_id);
  48                 flow_dissector->offset[key->key_id] = key->offset;
  49         }
  50
  51         /* Ensure that the dissector always includes control and basic key.
  52          * That way we are able to avoid handling lack of these in fast path.
  53          */
  54         BUG_ON(!dissector_uses_key(flow_dissector,
  55                                    FLOW_DISSECTOR_KEY_CONTROL));
  56         BUG_ON(!dissector_uses_key(flow_dissector,
  57                                    FLOW_DISSECTOR_KEY_BASIC));
  58 }
  59 EXPORT_SYMBOL(skb_flow_dissector_init);
  60
  61 /**
  62  * skb_flow_get_be16 - extract be16 entity
  63  * @skb: sk_buff to extract from
  64  * @poff: offset to extract at
  65  * @data: raw buffer pointer to the packet
  66  * @hlen: packet header length
  67  *
  68  * The function will try to retrieve a be32 entity at
  69  * offset poff
  70  */
  71 static __be16 skb_flow_get_be16(const struct sk_buff *skb, int poff,
  72                                 void *data, int hlen)
  73 {
  74         __be16 *u, _u;
  75
  76         u = __skb_header_pointer(skb, poff, sizeof(_u), data, hlen, &_u);
  77         if (u)
  78                 return *u;
  79
  80         return 0;
  81 }
  82
  83 /**
  84  * __skb_flow_get_ports - extract the upper layer ports and return them
  85  * @skb: sk_buff to extract the ports from
  86  * @thoff: transport header offset
  87  * @ip_proto: protocol for which to get port offset
  88  * @data: raw buffer pointer to the packet, if NULL use skb->data
  89  * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
  90  *
  91  * The function will try to retrieve the ports at offset thoff + poff where poff
  92  * is the protocol port offset returned from proto_ports_offset
  93  */
  94 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
  95                             void *data, int hlen)
  96 {
  97         int poff = proto_ports_offset(ip_proto);
  98
  99         if (!data) {
 100                 data = skb->data;
 101                 hlen = skb_headlen(skb);
 102         }
 103
 104         if (poff >= 0) {
 105                 __be32 *ports, _ports;
 106
 107                 ports = __skb_header_pointer(skb, thoff + poff,
 108                                              sizeof(_ports), data, hlen, &_ports);
 109                 if (ports)
 110                         return *ports;
 111         }
 112
 113         return 0;
 114 }
 115 EXPORT_SYMBOL(__skb_flow_get_ports);
 116
 117 enum flow_dissect_ret {
 118         FLOW_DISSECT_RET_OUT_GOOD,
 119         FLOW_DISSECT_RET_OUT_BAD,
 120         FLOW_DISSECT_RET_OUT_PROTO_AGAIN,
 121 };
 122
 123 static enum flow_dissect_ret
 124 __skb_flow_dissect_mpls(const struct sk_buff *skb,
 125                         struct flow_dissector *flow_dissector,
 126                         void *target_container, void *data, int nhoff, int hlen)
 127 {
 128         struct flow_dissector_key_keyid *key_keyid;
 129         struct mpls_label *hdr, _hdr[2];
 130         u32 entry, label;
 131
 132         if (!dissector_uses_key(flow_dissector,
 133                                 FLOW_DISSECTOR_KEY_MPLS_ENTROPY) &&
 134             !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS))
 135                 return FLOW_DISSECT_RET_OUT_GOOD;
 136
 137         hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
 138                                    hlen, &_hdr);
 139         if (!hdr)
 140                 return FLOW_DISSECT_RET_OUT_BAD;
 141
 142         entry = ntohl(hdr[0].entry);
 143         label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
 144
 145         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) {
 146                 struct flow_dissector_key_mpls *key_mpls;
 147
 148                 key_mpls = skb_flow_dissector_target(flow_dissector,
 149                                                      FLOW_DISSECTOR_KEY_MPLS,
 150                                                      target_container);
 151                 key_mpls->mpls_label = label;
 152                 key_mpls->mpls_ttl = (entry & MPLS_LS_TTL_MASK)
 153                                         >> MPLS_LS_TTL_SHIFT;
 154                 key_mpls->mpls_tc = (entry & MPLS_LS_TC_MASK)
 155                                         >> MPLS_LS_TC_SHIFT;
 156                 key_mpls->mpls_bos = (entry & MPLS_LS_S_MASK)
 157                                         >> MPLS_LS_S_SHIFT;
 158         }
 159
 160         if (label == MPLS_LABEL_ENTROPY) {
 161                 key_keyid = skb_flow_dissector_target(flow_dissector,
 162                                                       FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
 163                                                       target_container);
 164                 key_keyid->keyid = hdr[1].entry & htonl(MPLS_LS_LABEL_MASK);
 165         }
 166         return FLOW_DISSECT_RET_OUT_GOOD;
 167 }
 168
 169 static enum flow_dissect_ret
 170 __skb_flow_dissect_arp(const struct sk_buff *skb,
 171                        struct flow_dissector *flow_dissector,
 172                        void *target_container, void *data, int nhoff, int hlen)
 173 {
 174         struct flow_dissector_key_arp *key_arp;
 175         struct {
 176                 unsigned char ar_sha[ETH_ALEN];
 177                 unsigned char ar_sip[4];
 178                 unsigned char ar_tha[ETH_ALEN];
 179                 unsigned char ar_tip[4];
 180         } *arp_eth, _arp_eth;
 181         const struct arphdr *arp;
 182         struct arphdr _arp;
 183
 184         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP))
 185                 return FLOW_DISSECT_RET_OUT_GOOD;
 186
 187         arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
 188                                    hlen, &_arp);
 189         if (!arp)
 190                 return FLOW_DISSECT_RET_OUT_BAD;
 191
 192         if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
 193             arp->ar_pro != htons(ETH_P_IP) ||
 194             arp->ar_hln != ETH_ALEN ||
 195             arp->ar_pln != 4 ||
 196             (arp->ar_op != htons(ARPOP_REPLY) &&
 197              arp->ar_op != htons(ARPOP_REQUEST)))
 198                 return FLOW_DISSECT_RET_OUT_BAD;
 199
 200         arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
 201                                        sizeof(_arp_eth), data,
 202                                        hlen, &_arp_eth);
 203         if (!arp_eth)
 204                 return FLOW_DISSECT_RET_OUT_BAD;
 205
 206         key_arp = skb_flow_dissector_target(flow_dissector,
 207                                             FLOW_DISSECTOR_KEY_ARP,
 208                                             target_container);
 209
 210         memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip));
 211         memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip));
 212
 213         /* Only store the lower byte of the opcode;
 214          * this covers ARPOP_REPLY and ARPOP_REQUEST.
 215          */
 216         key_arp->op = ntohs(arp->ar_op) & 0xff;
 217
 218         ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
 219         ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
 220
 221         return FLOW_DISSECT_RET_OUT_GOOD;
 222 }
 223
 224 static enum flow_dissect_ret
 225 __skb_flow_dissect_gre(const struct sk_buff *skb,
 226                        struct flow_dissector_key_control *key_control,
 227                        struct flow_dissector *flow_dissector,
 228                        void *target_container, void *data,
 229                        __be16 *p_proto, int *p_nhoff, int *p_hlen,
 230                        unsigned int flags)
 231 {
 232         struct flow_dissector_key_keyid *key_keyid;
 233         struct gre_base_hdr *hdr, _hdr;
 234         int offset = 0;
 235         u16 gre_ver;
 236
 237         hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr),
 238                                    data, *p_hlen, &_hdr);
 239         if (!hdr)
 240                 return FLOW_DISSECT_RET_OUT_BAD;
 241
 242         /* Only look inside GRE without routing */
 243         if (hdr->flags & GRE_ROUTING)
 244                 return FLOW_DISSECT_RET_OUT_GOOD;
 245
 246         /* Only look inside GRE for version 0 and 1 */
 247         gre_ver = ntohs(hdr->flags & GRE_VERSION);
 248         if (gre_ver > 1)
 249                 return FLOW_DISSECT_RET_OUT_GOOD;
 250
 251         *p_proto = hdr->protocol;
 252         if (gre_ver) {
 253                 /* Version1 must be PPTP, and check the flags */
 254                 if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
 255                         return FLOW_DISSECT_RET_OUT_GOOD;
 256         }
 257
 258         offset += sizeof(struct gre_base_hdr);
 259
 260         if (hdr->flags & GRE_CSUM)
 261                 offset += sizeof(((struct gre_full_hdr *) 0)->csum) +
 262                           sizeof(((struct gre_full_hdr *) 0)->reserved1);
 263
 264         if (hdr->flags & GRE_KEY) {
 265                 const __be32 *keyid;
 266                 __be32 _keyid;
 267
 268                 keyid = __skb_header_pointer(skb, *p_nhoff + offset,
 269                                              sizeof(_keyid),
 270                                              data, *p_hlen, &_keyid);
 271                 if (!keyid)
 272                         return FLOW_DISSECT_RET_OUT_BAD;
 273
 274                 if (dissector_uses_key(flow_dissector,
 275                                        FLOW_DISSECTOR_KEY_GRE_KEYID)) {
 276                         key_keyid = skb_flow_dissector_target(flow_dissector,
 277                                                               FLOW_DISSECTOR_KEY_GRE_KEYID,
 278                                                               target_container);
 279                         if (gre_ver == 0)
 280                                 key_keyid->keyid = *keyid;
 281                         else
 282                                 key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
 283                 }
 284                 offset += sizeof(((struct gre_full_hdr *) 0)->key);
 285         }
 286
 287         if (hdr->flags & GRE_SEQ)
 288                 offset += sizeof(((struct pptp_gre_header *) 0)->seq);
 289
 290         if (gre_ver == 0) {
 291                 if (*p_proto == htons(ETH_P_TEB)) {
 292                         const struct ethhdr *eth;
 293                         struct ethhdr _eth;
 294
 295                         eth = __skb_header_pointer(skb, *p_nhoff + offset,
 296                                                    sizeof(_eth),
 297                                                    data, *p_hlen, &_eth);
 298                         if (!eth)
 299                                 return FLOW_DISSECT_RET_OUT_BAD;
 300                         *p_proto = eth->h_proto;
 301                         offset += sizeof(*eth);
 302
 303                         /* Cap headers that we access via pointers at the
 304                          * end of the Ethernet header as our maximum alignment
 305                          * at that point is only 2 bytes.
 306                          */
 307                         if (NET_IP_ALIGN)
 308                                 *p_hlen = *p_nhoff + offset;
 309                 }
 310         } else { /* version 1, must be PPTP */
 311                 u8 _ppp_hdr[PPP_HDRLEN];
 312                 u8 *ppp_hdr;
 313
 314                 if (hdr->flags & GRE_ACK)
 315                         offset += sizeof(((struct pptp_gre_header *) 0)->ack);
 316
 317                 ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset,
 318                                                sizeof(_ppp_hdr),
 319                                                data, *p_hlen, _ppp_hdr);
 320                 if (!ppp_hdr)
 321                         return FLOW_DISSECT_RET_OUT_BAD;
 322
 323                 switch (PPP_PROTOCOL(ppp_hdr)) {
 324                 case PPP_IP:
 325                         *p_proto = htons(ETH_P_IP);
 326                         break;
 327                 case PPP_IPV6:
 328                         *p_proto = htons(ETH_P_IPV6);
 329                         break;
 330                 default:
 331                         /* Could probably catch some more like MPLS */
 332                         break;
 333                 }
 334
 335                 offset += PPP_HDRLEN;
 336         }
 337
 338         *p_nhoff += offset;
 339         key_control->flags |= FLOW_DIS_ENCAPSULATION;
 340         if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 341                 return FLOW_DISSECT_RET_OUT_GOOD;
 342
 343         return FLOW_DISSECT_RET_OUT_PROTO_AGAIN;
 344 }
 345
 346 static void
 347 __skb_flow_dissect_tcp(const struct sk_buff *skb,
 348                        struct flow_dissector *flow_dissector,
 349                        void *target_container, void *data, int thoff, int hlen)
 350 {
 351         struct flow_dissector_key_tcp *key_tcp;
 352         struct tcphdr *th, _th;
 353
 354         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
 355                 return;
 356
 357         th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
 358         if (!th)
 359                 return;
 360
 361         if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
 362                 return;
 363
 364         key_tcp = skb_flow_dissector_target(flow_dissector,
 365                                             FLOW_DISSECTOR_KEY_TCP,
 366                                             target_container);
 367         key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
 368 }
 369
 370 /**
 371  * __skb_flow_dissect - extract the flow_keys struct and return it
 372  * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
 373  * @flow_dissector: list of keys to dissect
 374  * @target_container: target structure to put dissected values into
 375  * @data: raw buffer pointer to the packet, if NULL use skb->data
 376  * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
 377  * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
 378  * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
 379  *
 380  * The function will try to retrieve individual keys into target specified
 381  * by flow_dissector from either the skbuff or a raw buffer specified by the
 382  * rest parameters.
 383  *
 384  * Caller must take care of zeroing target container memory.
 385  */
 386 bool __skb_flow_dissect(const struct sk_buff *skb,
 387                         struct flow_dissector *flow_dissector,
 388                         void *target_container,
 389                         void *data, __be16 proto, int nhoff, int hlen,
 390                         unsigned int flags)
 391 {
 392         struct flow_dissector_key_control *key_control;
 393         struct flow_dissector_key_basic *key_basic;
 394         struct flow_dissector_key_addrs *key_addrs;
 395         struct flow_dissector_key_ports *key_ports;
 396         struct flow_dissector_key_icmp *key_icmp;
 397         struct flow_dissector_key_tags *key_tags;
 398         struct flow_dissector_key_vlan *key_vlan;
 399         bool skip_vlan = false;
 400         u8 ip_proto = 0;
 401         bool ret;
 402
 403         if (!data) {
 404                 data = skb->data;
 405                 proto = skb_vlan_tag_present(skb) ?
 406                          skb->vlan_proto : skb->protocol;
 407                 nhoff = skb_network_offset(skb);
 408                 hlen = skb_headlen(skb);
 409         }
 410
 411         /* It is ensured by skb_flow_dissector_init() that control key will
 412          * be always present.
 413          */
 414         key_control = skb_flow_dissector_target(flow_dissector,
 415                                                 FLOW_DISSECTOR_KEY_CONTROL,
 416                                                 target_container);
 417
 418         /* It is ensured by skb_flow_dissector_init() that basic key will
 419          * be always present.
 420          */
 421         key_basic = skb_flow_dissector_target(flow_dissector,
 422                                               FLOW_DISSECTOR_KEY_BASIC,
 423                                               target_container);
 424
 425         if (dissector_uses_key(flow_dissector,
 426                                FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
 427                 struct ethhdr *eth = eth_hdr(skb);
 428                 struct flow_dissector_key_eth_addrs *key_eth_addrs;
 429
 430                 key_eth_addrs = skb_flow_dissector_target(flow_dissector,
 431                                                           FLOW_DISSECTOR_KEY_ETH_ADDRS,
 432                                                           target_container);
 433                 memcpy(key_eth_addrs, &eth->h_dest, sizeof(*key_eth_addrs));
 434         }
 435
 436 proto_again:
 437         switch (proto) {
 438         case htons(ETH_P_IP): {
 439                 const struct iphdr *iph;
 440                 struct iphdr _iph;
 441 ip:
 442                 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
 443                 if (!iph || iph->ihl < 5)
 444                         goto out_bad;
 445                 nhoff += iph->ihl * 4;
 446
 447                 ip_proto = iph->protocol;
 448
 449                 if (dissector_uses_key(flow_dissector,
 450                                        FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
 451                         key_addrs = skb_flow_dissector_target(flow_dissector,
 452                                                               FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 453                                                               target_container);
 454
 455                         memcpy(&key_addrs->v4addrs, &iph->saddr,
 456                                sizeof(key_addrs->v4addrs));
 457                         key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 458                 }
 459
 460                 if (ip_is_fragment(iph)) {
 461                         key_control->flags |= FLOW_DIS_IS_FRAGMENT;
 462
 463                         if (iph->frag_off & htons(IP_OFFSET)) {
 464                                 goto out_good;
 465                         } else {
 466                                 key_control->flags |= FLOW_DIS_FIRST_FRAG;
 467                                 if (!(flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG))
 468                                         goto out_good;
 469                         }
 470                 }
 471
 472                 if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
 473                         goto out_good;
 474
 475                 break;
 476         }
 477         case htons(ETH_P_IPV6): {
 478                 const struct ipv6hdr *iph;
 479                 struct ipv6hdr _iph;
 480
 481 ipv6:
 482                 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
 483                 if (!iph)
 484                         goto out_bad;
 485
 486                 ip_proto = iph->nexthdr;
 487                 nhoff += sizeof(struct ipv6hdr);
 488
 489                 if (dissector_uses_key(flow_dissector,
 490                                        FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
 491                         key_addrs = skb_flow_dissector_target(flow_dissector,
 492                                                               FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 493                                                               target_container);
 494
 495                         memcpy(&key_addrs->v6addrs, &iph->saddr,
 496                                sizeof(key_addrs->v6addrs));
 497                         key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 498                 }
 499
 500                 if ((dissector_uses_key(flow_dissector,
 501                                         FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
 502                      (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
 503                     ip6_flowlabel(iph)) {
 504                         __be32 flow_label = ip6_flowlabel(iph);
 505
 506                         if (dissector_uses_key(flow_dissector,
 507                                                FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
 508                                 key_tags = skb_flow_dissector_target(flow_dissector,
 509                                                                      FLOW_DISSECTOR_KEY_FLOW_LABEL,
 510                                                                      target_container);
 511                                 key_tags->flow_label = ntohl(flow_label);
 512                         }
 513                         if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)
 514                                 goto out_good;
 515                 }
 516
 517                 if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
 518                         goto out_good;
 519
 520                 break;
 521         }
 522         case htons(ETH_P_8021AD):
 523         case htons(ETH_P_8021Q): {
 524                 const struct vlan_hdr *vlan;
 525                 struct vlan_hdr _vlan;
 526                 bool vlan_tag_present = skb && skb_vlan_tag_present(skb);
 527
 528                 if (vlan_tag_present)
 529                         proto = skb->protocol;
 530
 531                 if (!vlan_tag_present || eth_type_vlan(skb->protocol)) {
 532                         vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
 533                                                     data, hlen, &_vlan);
 534                         if (!vlan)
 535                                 goto out_bad;
 536                         proto = vlan->h_vlan_encapsulated_proto;
 537                         nhoff += sizeof(*vlan);
 538                         if (skip_vlan)
 539                                 goto proto_again;
 540                 }
 541
 542                 skip_vlan = true;
 543                 if (dissector_uses_key(flow_dissector,
 544                                        FLOW_DISSECTOR_KEY_VLAN)) {
 545                         key_vlan = skb_flow_dissector_target(flow_dissector,
 546                                                              FLOW_DISSECTOR_KEY_VLAN,
 547                                                              target_container);
 548
 549                         if (vlan_tag_present) {
 550                                 key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
 551                                 key_vlan->vlan_priority =
 552                                         (skb_vlan_tag_get_prio(skb) >> VLAN_PRIO_SHIFT);
 553                         } else {
 554                                 key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
 555                                         VLAN_VID_MASK;
 556                                 key_vlan->vlan_priority =
 557                                         (ntohs(vlan->h_vlan_TCI) &
 558                                          VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
 559                         }
 560                 }
 561
 562                 goto proto_again;
 563         }
 564         case htons(ETH_P_PPP_SES): {
 565                 struct {
 566                         struct pppoe_hdr hdr;
 567                         __be16 proto;
 568                 } *hdr, _hdr;
 569                 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
 570                 if (!hdr)
 571                         goto out_bad;
 572                 proto = hdr->proto;
 573                 nhoff += PPPOE_SES_HLEN;
 574                 switch (proto) {
 575                 case htons(PPP_IP):
 576                         goto ip;
 577                 case htons(PPP_IPV6):
 578                         goto ipv6;
 579                 default:
 580                         goto out_bad;
 581                 }
 582         }
 583         case htons(ETH_P_TIPC): {
 584                 struct {
 585                         __be32 pre[3];
 586                         __be32 srcnode;
 587                 } *hdr, _hdr;
 588                 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
 589                 if (!hdr)
 590                         goto out_bad;
 591
 592                 if (dissector_uses_key(flow_dissector,
 593                                        FLOW_DISSECTOR_KEY_TIPC_ADDRS)) {
 594                         key_addrs = skb_flow_dissector_target(flow_dissector,
 595                                                               FLOW_DISSECTOR_KEY_TIPC_ADDRS,
 596                                                               target_container);
 597                         key_addrs->tipcaddrs.srcnode = hdr->srcnode;
 598                         key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC_ADDRS;
 599                 }
 600                 goto out_good;
 601         }
 602
 603         case htons(ETH_P_MPLS_UC):
 604         case htons(ETH_P_MPLS_MC):
 605 mpls:
 606                 switch (__skb_flow_dissect_mpls(skb, flow_dissector,
 607                                                 target_container, data,
 608                                                 nhoff, hlen)) {
 609                 case FLOW_DISSECT_RET_OUT_GOOD:
 610                         goto out_good;
 611                 case FLOW_DISSECT_RET_OUT_BAD:
 612                 default:
 613                         goto out_bad;
 614                 }
 615         case htons(ETH_P_FCOE):
 616                 if ((hlen - nhoff) < FCOE_HEADER_LEN)
 617                         goto out_bad;
 618
 619                 nhoff += FCOE_HEADER_LEN;
 620                 goto out_good;
 621
 622         case htons(ETH_P_ARP):
 623         case htons(ETH_P_RARP):
 624                 switch (__skb_flow_dissect_arp(skb, flow_dissector,
 625                                                target_container, data,
 626                                                nhoff, hlen)) {
 627                 case FLOW_DISSECT_RET_OUT_GOOD:
 628                         goto out_good;
 629                 case FLOW_DISSECT_RET_OUT_BAD:
 630                 default:
 631                         goto out_bad;
 632                 }
 633         default:
 634                 goto out_bad;
 635         }
 636
 637 ip_proto_again:
 638         switch (ip_proto) {
 639         case IPPROTO_GRE:
 640                 switch (__skb_flow_dissect_gre(skb, key_control, flow_dissector,
 641                                                target_container, data,
 642                                                &proto, &nhoff, &hlen, flags)) {
 643                 case FLOW_DISSECT_RET_OUT_GOOD:
 644                         goto out_good;
 645                 case FLOW_DISSECT_RET_OUT_BAD:
 646                         goto out_bad;
 647                 case FLOW_DISSECT_RET_OUT_PROTO_AGAIN:
 648                         goto proto_again;
 649                 }
 650         case NEXTHDR_HOP:
 651         case NEXTHDR_ROUTING:
 652         case NEXTHDR_DEST: {
 653                 u8 _opthdr[2], *opthdr;
 654
 655                 if (proto != htons(ETH_P_IPV6))
 656                         break;
 657
 658                 opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
 659                                               data, hlen, &_opthdr);
 660                 if (!opthdr)
 661                         goto out_bad;
 662
 663                 ip_proto = opthdr[0];
 664                 nhoff += (opthdr[1] + 1) << 3;
 665
 666                 goto ip_proto_again;
 667         }
 668         case NEXTHDR_FRAGMENT: {
 669                 struct frag_hdr _fh, *fh;
 670
 671                 if (proto != htons(ETH_P_IPV6))
 672                         break;
 673
 674                 fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
 675                                           data, hlen, &_fh);
 676
 677                 if (!fh)
 678                         goto out_bad;
 679
 680                 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
 681
 682                 nhoff += sizeof(_fh);
 683                 ip_proto = fh->nexthdr;
 684
 685                 if (!(fh->frag_off & htons(IP6_OFFSET))) {
 686                         key_control->flags |= FLOW_DIS_FIRST_FRAG;
 687                         if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG)
 688                                 goto ip_proto_again;
 689                 }
 690                 goto out_good;
 691         }
 692         case IPPROTO_IPIP:
 693                 proto = htons(ETH_P_IP);
 694
 695                 key_control->flags |= FLOW_DIS_ENCAPSULATION;
 696                 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 697                         goto out_good;
 698
 699                 goto ip;
 700         case IPPROTO_IPV6:
 701                 proto = htons(ETH_P_IPV6);
 702
 703                 key_control->flags |= FLOW_DIS_ENCAPSULATION;
 704                 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 705                         goto out_good;
 706
 707                 goto ipv6;
 708         case IPPROTO_MPLS:
 709                 proto = htons(ETH_P_MPLS_UC);
 710                 goto mpls;
 711         case IPPROTO_TCP:
 712                 __skb_flow_dissect_tcp(skb, flow_dissector, target_container,
 713                                        data, nhoff, hlen);
 714                 break;
 715         default:
 716                 break;
 717         }
 718
 719         if (dissector_uses_key(flow_dissector,
 720                                FLOW_DISSECTOR_KEY_PORTS)) {
 721                 key_ports = skb_flow_dissector_target(flow_dissector,
 722                                                       FLOW_DISSECTOR_KEY_PORTS,
 723                                                       target_container);
 724                 key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
 725                                                         data, hlen);
 726         }
 727
 728         if (dissector_uses_key(flow_dissector,
 729                                FLOW_DISSECTOR_KEY_ICMP)) {
 730                 key_icmp = skb_flow_dissector_target(flow_dissector,
 731                                                      FLOW_DISSECTOR_KEY_ICMP,
 732                                                      target_container);
 733                 key_icmp->icmp = skb_flow_get_be16(skb, nhoff, data, hlen);
 734         }
 735
 736 out_good:
 737         ret = true;
 738
 739         key_control->thoff = (u16)nhoff;
 740 out:
 741         key_basic->n_proto = proto;
 742         key_basic->ip_proto = ip_proto;
 743
 744         return ret;
 745
 746 out_bad:
 747         ret = false;
 748         key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
 749         goto out;
 750 }
 751 EXPORT_SYMBOL(__skb_flow_dissect);
 752
 753 static u32 hashrnd __read_mostly;
 754 static __always_inline void __flow_hash_secret_init(void)
 755 {
 756         net_get_random_once(&hashrnd, sizeof(hashrnd));
 757 }
 758
 759 static __always_inline u32 __flow_hash_words(const u32 *words, u32 length,
 760                                              u32 keyval)
 761 {
 762         return jhash2(words, length, keyval);
 763 }
 764
 765 static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow)
 766 {
 767         const void *p = flow;
 768
 769         BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32));
 770         return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET);
 771 }
 772
 773 static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
 774 {
 775         size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
 776         BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
 777         BUILD_BUG_ON(offsetof(typeof(*flow), addrs) !=
 778                      sizeof(*flow) - sizeof(flow->addrs));
 779
 780         switch (flow->control.addr_type) {
 781         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
 782                 diff -= sizeof(flow->addrs.v4addrs);
 783                 break;
 784         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
 785                 diff -= sizeof(flow->addrs.v6addrs);
 786                 break;
 787         case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
 788                 diff -= sizeof(flow->addrs.tipcaddrs);
 789                 break;
 790         }
 791         return (sizeof(*flow) - diff) / sizeof(u32);
 792 }
 793
 794 __be32 flow_get_u32_src(const struct flow_keys *flow)
 795 {
 796         switch (flow->control.addr_type) {
 797         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
 798                 return flow->addrs.v4addrs.src;
 799         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
 800                 return (__force __be32)ipv6_addr_hash(
 801                         &flow->addrs.v6addrs.src);
 802         case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
 803                 return flow->addrs.tipcaddrs.srcnode;
 804         default:
 805                 return 0;
 806         }
 807 }
 808 EXPORT_SYMBOL(flow_get_u32_src);
 809
 810 __be32 flow_get_u32_dst(const struct flow_keys *flow)
 811 {
 812         switch (flow->control.addr_type) {
 813         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
 814                 return flow->addrs.v4addrs.dst;
 815         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
 816                 return (__force __be32)ipv6_addr_hash(
 817                         &flow->addrs.v6addrs.dst);
 818         default:
 819                 return 0;
 820         }
 821 }
 822 EXPORT_SYMBOL(flow_get_u32_dst);
 823
 824 static inline void __flow_hash_consistentify(struct flow_keys *keys)
 825 {
 826         int addr_diff, i;
 827
 828         switch (keys->control.addr_type) {
 829         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
 830                 addr_diff = (__force u32)keys->addrs.v4addrs.dst -
 831                             (__force u32)keys->addrs.v4addrs.src;
 832                 if ((addr_diff < 0) ||
 833                     (addr_diff == 0 &&
 834                      ((__force u16)keys->ports.dst <
 835                       (__force u16)keys->ports.src))) {
 836                         swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
 837                         swap(keys->ports.src, keys->ports.dst);
 838                 }
 839                 break;
 840         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
 841                 addr_diff = memcmp(&keys->addrs.v6addrs.dst,
 842                                    &keys->addrs.v6addrs.src,
 843                                    sizeof(keys->addrs.v6addrs.dst));
 844                 if ((addr_diff < 0) ||
 845                     (addr_diff == 0 &&
 846                      ((__force u16)keys->ports.dst <
 847                       (__force u16)keys->ports.src))) {
 848                         for (i = 0; i < 4; i++)
 849                                 swap(keys->addrs.v6addrs.src.s6_addr32[i],
 850                                      keys->addrs.v6addrs.dst.s6_addr32[i]);
 851                         swap(keys->ports.src, keys->ports.dst);
 852                 }
 853                 break;
 854         }
 855 }
 856
 857 static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval)
 858 {
 859         u32 hash;
 860
 861         __flow_hash_consistentify(keys);
 862
 863         hash = __flow_hash_words(flow_keys_hash_start(keys),
 864                                  flow_keys_hash_length(keys), keyval);
 865         if (!hash)
 866                 hash = 1;
 867
 868         return hash;
 869 }
 870
 871 u32 flow_hash_from_keys(struct flow_keys *keys)
 872 {
 873         __flow_hash_secret_init();
 874         return __flow_hash_from_keys(keys, hashrnd);
 875 }
 876 EXPORT_SYMBOL(flow_hash_from_keys);
 877
 878 static inline u32 ___skb_get_hash(const struct sk_buff *skb,
 879                                   struct flow_keys *keys, u32 keyval)
 880 {
 881         skb_flow_dissect_flow_keys(skb, keys,
 882                                    FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
 883
 884         return __flow_hash_from_keys(keys, keyval);
 885 }
 886
 887 struct _flow_keys_digest_data {
 888         __be16  n_proto;
 889         u8      ip_proto;
 890         u8      padding;
 891         __be32  ports;
 892         __be32  src;
 893         __be32  dst;
 894 };
 895
 896 void make_flow_keys_digest(struct flow_keys_digest *digest,
 897                            const struct flow_keys *flow)
 898 {
 899         struct _flow_keys_digest_data *data =
 900             (struct _flow_keys_digest_data *)digest;
 901
 902         BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
 903
 904         memset(digest, 0, sizeof(*digest));
 905
 906         data->n_proto = flow->basic.n_proto;
 907         data->ip_proto = flow->basic.ip_proto;
 908         data->ports = flow->ports.ports;
 909         data->src = flow->addrs.v4addrs.src;
 910         data->dst = flow->addrs.v4addrs.dst;
 911 }
 912 EXPORT_SYMBOL(make_flow_keys_digest);
 913
 914 static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
 915
 916 u32 __skb_get_hash_symmetric(const struct sk_buff *skb)
 917 {
 918         struct flow_keys keys;
 919
 920         __flow_hash_secret_init();
 921
 922         memset(&keys, 0, sizeof(keys));
 923         __skb_flow_dissect(skb, &flow_keys_dissector_symmetric, &keys,
 924                            NULL, 0, 0, 0,
 925                            FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
 926
 927         return __flow_hash_from_keys(&keys, hashrnd);
 928 }
 929 EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
 930
 931 /**
 932  * __skb_get_hash: calculate a flow hash
 933  * @skb: sk_buff to calculate flow hash from
 934  *
 935  * This function calculates a flow hash based on src/dst addresses
 936  * and src/dst port numbers.  Sets hash in skb to non-zero hash value
 937  * on success, zero indicates no valid hash.  Also, sets l4_hash in skb
 938  * if hash is a canonical 4-tuple hash over transport ports.
 939  */
 940 void __skb_get_hash(struct sk_buff *skb)
 941 {
 942         struct flow_keys keys;
 943         u32 hash;
 944
 945         __flow_hash_secret_init();
 946
 947         hash = ___skb_get_hash(skb, &keys, hashrnd);
 948
 949         __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
 950 }
 951 EXPORT_SYMBOL(__skb_get_hash);
 952
 953 __u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb)
 954 {
 955         struct flow_keys keys;
 956
 957         return ___skb_get_hash(skb, &keys, perturb);
 958 }
 959 EXPORT_SYMBOL(skb_get_hash_perturb);
 960
 961 __u32 __skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6)
 962 {
 963         struct flow_keys keys;
 964
 965         memset(&keys, 0, sizeof(keys));
 966
 967         memcpy(&keys.addrs.v6addrs.src, &fl6->saddr,
 968                sizeof(keys.addrs.v6addrs.src));
 969         memcpy(&keys.addrs.v6addrs.dst, &fl6->daddr,
 970                sizeof(keys.addrs.v6addrs.dst));
 971         keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 972         keys.ports.src = fl6->fl6_sport;
 973         keys.ports.dst = fl6->fl6_dport;
 974         keys.keyid.keyid = fl6->fl6_gre_key;
 975         keys.tags.flow_label = (__force u32)fl6->flowlabel;
 976         keys.basic.ip_proto = fl6->flowi6_proto;
 977
 978         __skb_set_sw_hash(skb, flow_hash_from_keys(&keys),
 979                           flow_keys_have_l4(&keys));
 980
 981         return skb->hash;
 982 }
 983 EXPORT_SYMBOL(__skb_get_hash_flowi6);
 984
 985 __u32 __skb_get_hash_flowi4(struct sk_buff *skb, const struct flowi4 *fl4)
 986 {
 987         struct flow_keys keys;
 988
 989         memset(&keys, 0, sizeof(keys));
 990
 991         keys.addrs.v4addrs.src = fl4->saddr;
 992         keys.addrs.v4addrs.dst = fl4->daddr;
 993         keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 994         keys.ports.src = fl4->fl4_sport;
 995         keys.ports.dst = fl4->fl4_dport;
 996         keys.keyid.keyid = fl4->fl4_gre_key;
 997         keys.basic.ip_proto = fl4->flowi4_proto;
 998
 999         __skb_set_sw_hash(skb, flow_hash_from_keys(&keys),
1000                           flow_keys_have_l4(&keys));
1001
1002         return skb->hash;
1003 }
1004 EXPORT_SYMBOL(__skb_get_hash_flowi4);
1005
1006 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
1007                    const struct flow_keys *keys, int hlen)
1008 {
1009         u32 poff = keys->control.thoff;
1010
1011         /* skip L4 headers for fragments after the first */
1012         if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
1013             !(keys->control.flags & FLOW_DIS_FIRST_FRAG))
1014                 return poff;
1015
1016         switch (keys->basic.ip_proto) {
1017         case IPPROTO_TCP: {
1018                 /* access doff as u8 to avoid unaligned access */
1019                 const u8 *doff;
1020                 u8 _doff;
1021
1022                 doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
1023                                             data, hlen, &_doff);
1024                 if (!doff)
1025                         return poff;
1026
1027                 poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
1028                 break;
1029         }
1030         case IPPROTO_UDP:
1031         case IPPROTO_UDPLITE:
1032                 poff += sizeof(struct udphdr);
1033                 break;
1034         /* For the rest, we do not really care about header
1035          * extensions at this point for now.
1036          */
1037         case IPPROTO_ICMP:
1038                 poff += sizeof(struct icmphdr);
1039                 break;
1040         case IPPROTO_ICMPV6:
1041                 poff += sizeof(struct icmp6hdr);
1042                 break;
1043         case IPPROTO_IGMP:
1044                 poff += sizeof(struct igmphdr);
1045                 break;
1046         case IPPROTO_DCCP:
1047                 poff += sizeof(struct dccp_hdr);
1048                 break;
1049         case IPPROTO_SCTP:
1050                 poff += sizeof(struct sctphdr);
1051                 break;
1052         }
1053
1054         return poff;
1055 }
1056
1057 /**
1058  * skb_get_poff - get the offset to the payload
1059  * @skb: sk_buff to get the payload offset from
1060  *
1061  * The function will get the offset to the payload as far as it could
1062  * be dissected.  The main user is currently BPF, so that we can dynamically
1063  * truncate packets without needing to push actual payload to the user
1064  * space and can analyze headers only, instead.
1065  */
1066 u32 skb_get_poff(const struct sk_buff *skb)
1067 {
1068         struct flow_keys keys;
1069
1070         if (!skb_flow_dissect_flow_keys(skb, &keys, 0))
1071                 return 0;
1072
1073         return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
1074 }
1075
1076 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
1077 {
1078         memset(keys, 0, sizeof(*keys));
1079
1080         memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
1081             sizeof(keys->addrs.v6addrs.src));
1082         memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
1083             sizeof(keys->addrs.v6addrs.dst));
1084         keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1085         keys->ports.src = fl6->fl6_sport;
1086         keys->ports.dst = fl6->fl6_dport;
1087         keys->keyid.keyid = fl6->fl6_gre_key;
1088         keys->tags.flow_label = (__force u32)fl6->flowlabel;
1089         keys->basic.ip_proto = fl6->flowi6_proto;
1090
1091         return flow_hash_from_keys(keys);
1092 }
1093 EXPORT_SYMBOL(__get_hash_from_flowi6);
1094
1095 __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys)
1096 {
1097         memset(keys, 0, sizeof(*keys));
1098
1099         keys->addrs.v4addrs.src = fl4->saddr;
1100         keys->addrs.v4addrs.dst = fl4->daddr;
1101         keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
1102         keys->ports.src = fl4->fl4_sport;
1103         keys->ports.dst = fl4->fl4_dport;
1104         keys->keyid.keyid = fl4->fl4_gre_key;
1105         keys->basic.ip_proto = fl4->flowi4_proto;
1106
1107         return flow_hash_from_keys(keys);
1108 }
1109 EXPORT_SYMBOL(__get_hash_from_flowi4);
1110
1111 static const struct flow_dissector_key flow_keys_dissector_keys[] = {
1112         {
1113                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1114                 .offset = offsetof(struct flow_keys, control),
1115         },
1116         {
1117                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1118                 .offset = offsetof(struct flow_keys, basic),
1119         },
1120         {
1121                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1122                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1123         },
1124         {
1125                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1126                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1127         },
1128         {
1129                 .key_id = FLOW_DISSECTOR_KEY_TIPC_ADDRS,
1130                 .offset = offsetof(struct flow_keys, addrs.tipcaddrs),
1131         },
1132         {
1133                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1134                 .offset = offsetof(struct flow_keys, ports),
1135         },
1136         {
1137                 .key_id = FLOW_DISSECTOR_KEY_VLAN,
1138                 .offset = offsetof(struct flow_keys, vlan),
1139         },
1140         {
1141                 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
1142                 .offset = offsetof(struct flow_keys, tags),
1143         },
1144         {
1145                 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
1146                 .offset = offsetof(struct flow_keys, keyid),
1147         },
1148 };
1149
1150 static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
1151         {
1152                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1153                 .offset = offsetof(struct flow_keys, control),
1154         },
1155         {
1156                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1157                 .offset = offsetof(struct flow_keys, basic),
1158         },
1159         {
1160                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1161                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1162         },
1163         {
1164                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1165                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1166         },
1167         {
1168                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1169                 .offset = offsetof(struct flow_keys, ports),
1170         },
1171 };
1172
1173 static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = {
1174         {
1175                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1176                 .offset = offsetof(struct flow_keys, control),
1177         },
1178         {
1179                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1180                 .offset = offsetof(struct flow_keys, basic),
1181         },
1182 };
1183
1184 struct flow_dissector flow_keys_dissector __read_mostly;
1185 EXPORT_SYMBOL(flow_keys_dissector);
1186
1187 struct flow_dissector flow_keys_buf_dissector __read_mostly;
1188
1189 static int __init init_default_flow_dissectors(void)
1190 {
1191         skb_flow_dissector_init(&flow_keys_dissector,
1192                                 flow_keys_dissector_keys,
1193                                 ARRAY_SIZE(flow_keys_dissector_keys));
1194         skb_flow_dissector_init(&flow_keys_dissector_symmetric,
1195                                 flow_keys_dissector_symmetric_keys,
1196                                 ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
1197         skb_flow_dissector_init(&flow_keys_buf_dissector,
1198                                 flow_keys_buf_dissector_keys,
1199                                 ARRAY_SIZE(flow_keys_buf_dissector_keys));
1200         return 0;
1201 }
1202
1203 core_initcall(init_default_flow_dissectors);