net/core/flow_dissector.c

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