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                             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                            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 ? : 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,
 191                                     void *data, 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, void *data, int nhoff, int hlen,
 413                         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, void *data, int nhoff, int hlen)
 471 {
 472         struct flow_dissector_key_arp *key_arp;
 473         struct {
 474                 unsigned char ar_sha[ETH_ALEN];
 475                 unsigned char ar_sip[4];
 476                 unsigned char ar_tha[ETH_ALEN];
 477                 unsigned char ar_tip[4];
 478         } *arp_eth, _arp_eth;
 479         const struct arphdr *arp;
 480         struct arphdr _arp;
 481
 482         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP))
 483                 return FLOW_DISSECT_RET_OUT_GOOD;
 484
 485         arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
 486                                    hlen, &_arp);
 487         if (!arp)
 488                 return FLOW_DISSECT_RET_OUT_BAD;
 489
 490         if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
 491             arp->ar_pro != htons(ETH_P_IP) ||
 492             arp->ar_hln != ETH_ALEN ||
 493             arp->ar_pln != 4 ||
 494             (arp->ar_op != htons(ARPOP_REPLY) &&
 495              arp->ar_op != htons(ARPOP_REQUEST)))
 496                 return FLOW_DISSECT_RET_OUT_BAD;
 497
 498         arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
 499                                        sizeof(_arp_eth), data,
 500                                        hlen, &_arp_eth);
 501         if (!arp_eth)
 502                 return FLOW_DISSECT_RET_OUT_BAD;
 503
 504         key_arp = skb_flow_dissector_target(flow_dissector,
 505                                             FLOW_DISSECTOR_KEY_ARP,
 506                                             target_container);
 507
 508         memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip));
 509         memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip));
 510
 511         /* Only store the lower byte of the opcode;
 512          * this covers ARPOP_REPLY and ARPOP_REQUEST.
 513          */
 514         key_arp->op = ntohs(arp->ar_op) & 0xff;
 515
 516         ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
 517         ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
 518
 519         return FLOW_DISSECT_RET_OUT_GOOD;
 520 }
 521
 522 static enum flow_dissect_ret
 523 __skb_flow_dissect_gre(const struct sk_buff *skb,
 524                        struct flow_dissector_key_control *key_control,
 525                        struct flow_dissector *flow_dissector,
 526                        void *target_container, void *data,
 527                        __be16 *p_proto, int *p_nhoff, int *p_hlen,
 528                        unsigned int flags)
 529 {
 530         struct flow_dissector_key_keyid *key_keyid;
 531         struct gre_base_hdr *hdr, _hdr;
 532         int offset = 0;
 533         u16 gre_ver;
 534
 535         hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr),
 536                                    data, *p_hlen, &_hdr);
 537         if (!hdr)
 538                 return FLOW_DISSECT_RET_OUT_BAD;
 539
 540         /* Only look inside GRE without routing */
 541         if (hdr->flags & GRE_ROUTING)
 542                 return FLOW_DISSECT_RET_OUT_GOOD;
 543
 544         /* Only look inside GRE for version 0 and 1 */
 545         gre_ver = ntohs(hdr->flags & GRE_VERSION);
 546         if (gre_ver > 1)
 547                 return FLOW_DISSECT_RET_OUT_GOOD;
 548
 549         *p_proto = hdr->protocol;
 550         if (gre_ver) {
 551                 /* Version1 must be PPTP, and check the flags */
 552                 if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
 553                         return FLOW_DISSECT_RET_OUT_GOOD;
 554         }
 555
 556         offset += sizeof(struct gre_base_hdr);
 557
 558         if (hdr->flags & GRE_CSUM)
 559                 offset += sizeof_field(struct gre_full_hdr, csum) +
 560                           sizeof_field(struct gre_full_hdr, reserved1);
 561
 562         if (hdr->flags & GRE_KEY) {
 563                 const __be32 *keyid;
 564                 __be32 _keyid;
 565
 566                 keyid = __skb_header_pointer(skb, *p_nhoff + offset,
 567                                              sizeof(_keyid),
 568                                              data, *p_hlen, &_keyid);
 569                 if (!keyid)
 570                         return FLOW_DISSECT_RET_OUT_BAD;
 571
 572                 if (dissector_uses_key(flow_dissector,
 573                                        FLOW_DISSECTOR_KEY_GRE_KEYID)) {
 574                         key_keyid = skb_flow_dissector_target(flow_dissector,
 575                                                               FLOW_DISSECTOR_KEY_GRE_KEYID,
 576                                                               target_container);
 577                         if (gre_ver == 0)
 578                                 key_keyid->keyid = *keyid;
 579                         else
 580                                 key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
 581                 }
 582                 offset += sizeof_field(struct gre_full_hdr, key);
 583         }
 584
 585         if (hdr->flags & GRE_SEQ)
 586                 offset += sizeof_field(struct pptp_gre_header, seq);
 587
 588         if (gre_ver == 0) {
 589                 if (*p_proto == htons(ETH_P_TEB)) {
 590                         const struct ethhdr *eth;
 591                         struct ethhdr _eth;
 592
 593                         eth = __skb_header_pointer(skb, *p_nhoff + offset,
 594                                                    sizeof(_eth),
 595                                                    data, *p_hlen, &_eth);
 596                         if (!eth)
 597                                 return FLOW_DISSECT_RET_OUT_BAD;
 598                         *p_proto = eth->h_proto;
 599                         offset += sizeof(*eth);
 600
 601                         /* Cap headers that we access via pointers at the
 602                          * end of the Ethernet header as our maximum alignment
 603                          * at that point is only 2 bytes.
 604                          */
 605                         if (NET_IP_ALIGN)
 606                                 *p_hlen = *p_nhoff + offset;
 607                 }
 608         } else { /* version 1, must be PPTP */
 609                 u8 _ppp_hdr[PPP_HDRLEN];
 610                 u8 *ppp_hdr;
 611
 612                 if (hdr->flags & GRE_ACK)
 613                         offset += sizeof_field(struct pptp_gre_header, ack);
 614
 615                 ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset,
 616                                                sizeof(_ppp_hdr),
 617                                                data, *p_hlen, _ppp_hdr);
 618                 if (!ppp_hdr)
 619                         return FLOW_DISSECT_RET_OUT_BAD;
 620
 621                 switch (PPP_PROTOCOL(ppp_hdr)) {
 622                 case PPP_IP:
 623                         *p_proto = htons(ETH_P_IP);
 624                         break;
 625                 case PPP_IPV6:
 626                         *p_proto = htons(ETH_P_IPV6);
 627                         break;
 628                 default:
 629                         /* Could probably catch some more like MPLS */
 630                         break;
 631                 }
 632
 633                 offset += PPP_HDRLEN;
 634         }
 635
 636         *p_nhoff += offset;
 637         key_control->flags |= FLOW_DIS_ENCAPSULATION;
 638         if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 639                 return FLOW_DISSECT_RET_OUT_GOOD;
 640
 641         return FLOW_DISSECT_RET_PROTO_AGAIN;
 642 }
 643
 644 /**
 645  * __skb_flow_dissect_batadv() - dissect batman-adv header
 646  * @skb: sk_buff to with the batman-adv header
 647  * @key_control: flow dissectors control key
 648  * @data: raw buffer pointer to the packet, if NULL use skb->data
 649  * @p_proto: pointer used to update the protocol to process next
 650  * @p_nhoff: pointer used to update inner network header offset
 651  * @hlen: packet header length
 652  * @flags: any combination of FLOW_DISSECTOR_F_*
 653  *
 654  * ETH_P_BATMAN packets are tried to be dissected. Only
 655  * &struct batadv_unicast packets are actually processed because they contain an
 656  * inner ethernet header and are usually followed by actual network header. This
 657  * allows the flow dissector to continue processing the packet.
 658  *
 659  * Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found,
 660  *  FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation,
 661  *  otherwise FLOW_DISSECT_RET_OUT_BAD
 662  */
 663 static enum flow_dissect_ret
 664 __skb_flow_dissect_batadv(const struct sk_buff *skb,
 665                           struct flow_dissector_key_control *key_control,
 666                           void *data, __be16 *p_proto, int *p_nhoff, int hlen,
 667                           unsigned int flags)
 668 {
 669         struct {
 670                 struct batadv_unicast_packet batadv_unicast;
 671                 struct ethhdr eth;
 672         } *hdr, _hdr;
 673
 674         hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen,
 675                                    &_hdr);
 676         if (!hdr)
 677                 return FLOW_DISSECT_RET_OUT_BAD;
 678
 679         if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION)
 680                 return FLOW_DISSECT_RET_OUT_BAD;
 681
 682         if (hdr->batadv_unicast.packet_type != BATADV_UNICAST)
 683                 return FLOW_DISSECT_RET_OUT_BAD;
 684
 685         *p_proto = hdr->eth.h_proto;
 686         *p_nhoff += sizeof(*hdr);
 687
 688         key_control->flags |= FLOW_DIS_ENCAPSULATION;
 689         if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
 690                 return FLOW_DISSECT_RET_OUT_GOOD;
 691
 692         return FLOW_DISSECT_RET_PROTO_AGAIN;
 693 }
 694
 695 static void
 696 __skb_flow_dissect_tcp(const struct sk_buff *skb,
 697                        struct flow_dissector *flow_dissector,
 698                        void *target_container, void *data, int thoff, int hlen)
 699 {
 700         struct flow_dissector_key_tcp *key_tcp;
 701         struct tcphdr *th, _th;
 702
 703         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
 704                 return;
 705
 706         th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
 707         if (!th)
 708                 return;
 709
 710         if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
 711                 return;
 712
 713         key_tcp = skb_flow_dissector_target(flow_dissector,
 714                                             FLOW_DISSECTOR_KEY_TCP,
 715                                             target_container);
 716         key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
 717 }
 718
 719 static void
 720 __skb_flow_dissect_ports(const struct sk_buff *skb,
 721                          struct flow_dissector *flow_dissector,
 722                          void *target_container, void *data, int nhoff,
 723                          u8 ip_proto, int hlen)
 724 {
 725         enum flow_dissector_key_id dissector_ports = FLOW_DISSECTOR_KEY_MAX;
 726         struct flow_dissector_key_ports *key_ports;
 727
 728         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
 729                 dissector_ports = FLOW_DISSECTOR_KEY_PORTS;
 730         else if (dissector_uses_key(flow_dissector,
 731                                     FLOW_DISSECTOR_KEY_PORTS_RANGE))
 732                 dissector_ports = FLOW_DISSECTOR_KEY_PORTS_RANGE;
 733
 734         if (dissector_ports == FLOW_DISSECTOR_KEY_MAX)
 735                 return;
 736
 737         key_ports = skb_flow_dissector_target(flow_dissector,
 738                                               dissector_ports,
 739                                               target_container);
 740         key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
 741                                                 data, hlen);
 742 }
 743
 744 static void
 745 __skb_flow_dissect_ipv4(const struct sk_buff *skb,
 746                         struct flow_dissector *flow_dissector,
 747                         void *target_container, void *data, const struct iphdr *iph)
 748 {
 749         struct flow_dissector_key_ip *key_ip;
 750
 751         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
 752                 return;
 753
 754         key_ip = skb_flow_dissector_target(flow_dissector,
 755                                            FLOW_DISSECTOR_KEY_IP,
 756                                            target_container);
 757         key_ip->tos = iph->tos;
 758         key_ip->ttl = iph->ttl;
 759 }
 760
 761 static void
 762 __skb_flow_dissect_ipv6(const struct sk_buff *skb,
 763                         struct flow_dissector *flow_dissector,
 764                         void *target_container, void *data, const struct ipv6hdr *iph)
 765 {
 766         struct flow_dissector_key_ip *key_ip;
 767
 768         if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
 769                 return;
 770
 771         key_ip = skb_flow_dissector_target(flow_dissector,
 772                                            FLOW_DISSECTOR_KEY_IP,
 773                                            target_container);
 774         key_ip->tos = ipv6_get_dsfield(iph);
 775         key_ip->ttl = iph->hop_limit;
 776 }
 777
 778 /* Maximum number of protocol headers that can be parsed in
 779  * __skb_flow_dissect
 780  */
 781 #define MAX_FLOW_DISSECT_HDRS   15
 782
 783 static bool skb_flow_dissect_allowed(int *num_hdrs)
 784 {
 785         ++*num_hdrs;
 786
 787         return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS);
 788 }
 789
 790 static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
 791                                      struct flow_dissector *flow_dissector,
 792                                      void *target_container)
 793 {
 794         struct flow_dissector_key_ports *key_ports = NULL;
 795         struct flow_dissector_key_control *key_control;
 796         struct flow_dissector_key_basic *key_basic;
 797         struct flow_dissector_key_addrs *key_addrs;
 798         struct flow_dissector_key_tags *key_tags;
 799
 800         key_control = skb_flow_dissector_target(flow_dissector,
 801                                                 FLOW_DISSECTOR_KEY_CONTROL,
 802                                                 target_container);
 803         key_control->thoff = flow_keys->thoff;
 804         if (flow_keys->is_frag)
 805                 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
 806         if (flow_keys->is_first_frag)
 807                 key_control->flags |= FLOW_DIS_FIRST_FRAG;
 808         if (flow_keys->is_encap)
 809                 key_control->flags |= FLOW_DIS_ENCAPSULATION;
 810
 811         key_basic = skb_flow_dissector_target(flow_dissector,
 812                                               FLOW_DISSECTOR_KEY_BASIC,
 813                                               target_container);
 814         key_basic->n_proto = flow_keys->n_proto;
 815         key_basic->ip_proto = flow_keys->ip_proto;
 816
 817         if (flow_keys->addr_proto == ETH_P_IP &&
 818             dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
 819                 key_addrs = skb_flow_dissector_target(flow_dissector,
 820                                                       FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 821                                                       target_container);
 822                 key_addrs->v4addrs.src = flow_keys->ipv4_src;
 823                 key_addrs->v4addrs.dst = flow_keys->ipv4_dst;
 824                 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
 825         } else if (flow_keys->addr_proto == ETH_P_IPV6 &&
 826                    dissector_uses_key(flow_dissector,
 827                                       FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
 828                 key_addrs = skb_flow_dissector_target(flow_dissector,
 829                                                       FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 830                                                       target_container);
 831                 memcpy(&key_addrs->v6addrs, &flow_keys->ipv6_src,
 832                        sizeof(key_addrs->v6addrs));
 833                 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 834         }
 835
 836         if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
 837                 key_ports = skb_flow_dissector_target(flow_dissector,
 838                                                       FLOW_DISSECTOR_KEY_PORTS,
 839                                                       target_container);
 840         else if (dissector_uses_key(flow_dissector,
 841                                     FLOW_DISSECTOR_KEY_PORTS_RANGE))
 842                 key_ports = skb_flow_dissector_target(flow_dissector,
 843                                                       FLOW_DISSECTOR_KEY_PORTS_RANGE,
 844                                                       target_container);
 845
 846         if (key_ports) {
 847                 key_ports->src = flow_keys->sport;
 848                 key_ports->dst = flow_keys->dport;
 849         }
 850
 851         if (dissector_uses_key(flow_dissector,
 852                                FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
 853                 key_tags = skb_flow_dissector_target(flow_dissector,
 854                                                      FLOW_DISSECTOR_KEY_FLOW_LABEL,
 855                                                      target_container);
 856                 key_tags->flow_label = ntohl(flow_keys->flow_label);
 857         }
 858 }
 859
 860 bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
 861                       __be16 proto, int nhoff, int hlen, unsigned int flags)
 862 {
 863         struct bpf_flow_keys *flow_keys = ctx->flow_keys;
 864         u32 result;
 865
 866         /* Pass parameters to the BPF program */
 867         memset(flow_keys, 0, sizeof(*flow_keys));
 868         flow_keys->n_proto = proto;
 869         flow_keys->nhoff = nhoff;
 870         flow_keys->thoff = flow_keys->nhoff;
 871
 872         BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG !=
 873                      (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG);
 874         BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL !=
 875                      (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
 876         BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP !=
 877                      (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP);
 878         flow_keys->flags = flags;
 879
 880         result = bpf_prog_run_pin_on_cpu(prog, ctx);
 881
 882         flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen);
 883         flow_keys->thoff = clamp_t(u16, flow_keys->thoff,
 884                                    flow_keys->nhoff, hlen);
 885
 886         return result == BPF_OK;
 887 }
 888
 889 /**
 890  * __skb_flow_dissect - extract the flow_keys struct and return it
 891  * @net: associated network namespace, derived from @skb if NULL
 892  * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
 893  * @flow_dissector: list of keys to dissect
 894  * @target_container: target structure to put dissected values into
 895  * @data: raw buffer pointer to the packet, if NULL use skb->data
 896  * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
 897  * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
 898  * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
 899  * @flags: flags that control the dissection process, e.g.
 900  *         FLOW_DISSECTOR_F_STOP_AT_ENCAP.
 901  *
 902  * The function will try to retrieve individual keys into target specified
 903  * by flow_dissector from either the skbuff or a raw buffer specified by the
 904  * rest parameters.
 905  *
 906  * Caller must take care of zeroing target container memory.
 907  */
 908 bool __skb_flow_dissect(const struct net *net,
 909                         const struct sk_buff *skb,
 910                         struct flow_dissector *flow_dissector,
 911                         void *target_container,
 912                         void *data, __be16 proto, int nhoff, int hlen,
 913                         unsigned int flags)
 914 {
 915         struct flow_dissector_key_control *key_control;
 916         struct flow_dissector_key_basic *key_basic;
 917         struct flow_dissector_key_addrs *key_addrs;
 918         struct flow_dissector_key_tags *key_tags;
 919         struct flow_dissector_key_vlan *key_vlan;
 920         enum flow_dissect_ret fdret;
 921         enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX;
 922         bool mpls_el = false;
 923         int mpls_lse = 0;
 924         int num_hdrs = 0;
 925         u8 ip_proto = 0;
 926         bool ret;
 927
 928         if (!data) {
 929                 data = skb->data;
 930                 proto = skb_vlan_tag_present(skb) ?
 931                          skb->vlan_proto : skb->protocol;
 932                 nhoff = skb_network_offset(skb);
 933                 hlen = skb_headlen(skb);
 934 #if IS_ENABLED(CONFIG_NET_DSA)
 935                 if (unlikely(skb->dev && netdev_uses_dsa(skb->dev) &&
 936                              proto == htons(ETH_P_XDSA))) {
 937                         const struct dsa_device_ops *ops;
 938                         int offset = 0;
 939
 940                         ops = skb->dev->dsa_ptr->tag_ops;
 941                         /* Tail taggers don't break flow dissection */
 942                         if (!ops->tail_tag) {
 943                                 if (ops->flow_dissect)
 944                                         ops->flow_dissect(skb, &proto, &offset);
 945                                 else
 946                                         dsa_tag_generic_flow_dissect(skb,
 947                                                                      &proto,
 948                                                                      &offset);
 949                                 hlen -= offset;
 950                                 nhoff += offset;
 951                         }
 952                 }
 953 #endif
 954         }
 955
 956         /* It is ensured by skb_flow_dissector_init() that control key will
 957          * be always present.
 958          */
 959         key_control = skb_flow_dissector_target(flow_dissector,
 960                                                 FLOW_DISSECTOR_KEY_CONTROL,
 961                                                 target_container);
 962
 963         /* It is ensured by skb_flow_dissector_init() that basic key will
 964          * be always present.
 965          */
 966         key_basic = skb_flow_dissector_target(flow_dissector,
 967                                               FLOW_DISSECTOR_KEY_BASIC,
 968                                               target_container);
 969
 970         if (skb) {
 971                 if (!net) {
 972                         if (skb->dev)
 973                                 net = dev_net(skb->dev);
 974                         else if (skb->sk)
 975                                 net = sock_net(skb->sk);
 976                 }
 977         }
 978
 979         WARN_ON_ONCE(!net);
 980         if (net) {
 981                 enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR;
 982                 struct bpf_prog_array *run_array;
 983
 984                 rcu_read_lock();
 985                 run_array = rcu_dereference(init_net.bpf.run_array[type]);
 986                 if (!run_array)
 987                         run_array = rcu_dereference(net->bpf.run_array[type]);
 988
 989                 if (run_array) {
 990                         struct bpf_flow_keys flow_keys;
 991                         struct bpf_flow_dissector ctx = {
 992                                 .flow_keys = &flow_keys,
 993                                 .data = data,
 994                                 .data_end = data + hlen,
 995                         };
 996                         __be16 n_proto = proto;
 997                         struct bpf_prog *prog;
 998
 999                         if (skb) {
1000                                 ctx.skb = skb;
1001                                 /* we can't use 'proto' in the skb case
1002                                  * because it might be set to skb->vlan_proto
1003                                  * which has been pulled from the data
1004                                  */
1005                                 n_proto = skb->protocol;
1006                         }
1007
1008                         prog = READ_ONCE(run_array->items[0].prog);
1009                         ret = bpf_flow_dissect(prog, &ctx, n_proto, nhoff,
1010                                                hlen, flags);
1011                         __skb_flow_bpf_to_target(&flow_keys, flow_dissector,
1012                                                  target_container);
1013                         rcu_read_unlock();
1014                         return ret;
1015                 }
1016                 rcu_read_unlock();
1017         }
1018
1019         if (dissector_uses_key(flow_dissector,
1020                                FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
1021                 struct ethhdr *eth = eth_hdr(skb);
1022                 struct flow_dissector_key_eth_addrs *key_eth_addrs;
1023
1024                 key_eth_addrs = skb_flow_dissector_target(flow_dissector,
1025                                                           FLOW_DISSECTOR_KEY_ETH_ADDRS,
1026                                                           target_container);
1027                 memcpy(key_eth_addrs, &eth->h_dest, sizeof(*key_eth_addrs));
1028         }
1029
1030 proto_again:
1031         fdret = FLOW_DISSECT_RET_CONTINUE;
1032
1033         switch (proto) {
1034         case htons(ETH_P_IP): {
1035                 const struct iphdr *iph;
1036                 struct iphdr _iph;
1037
1038                 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
1039                 if (!iph || iph->ihl < 5) {
1040                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1041                         break;
1042                 }
1043
1044                 nhoff += iph->ihl * 4;
1045
1046                 ip_proto = iph->protocol;
1047
1048                 if (dissector_uses_key(flow_dissector,
1049                                        FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
1050                         key_addrs = skb_flow_dissector_target(flow_dissector,
1051                                                               FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1052                                                               target_container);
1053
1054                         memcpy(&key_addrs->v4addrs, &iph->saddr,
1055                                sizeof(key_addrs->v4addrs));
1056                         key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
1057                 }
1058
1059                 __skb_flow_dissect_ipv4(skb, flow_dissector,
1060                                         target_container, data, iph);
1061
1062                 if (ip_is_fragment(iph)) {
1063                         key_control->flags |= FLOW_DIS_IS_FRAGMENT;
1064
1065                         if (iph->frag_off & htons(IP_OFFSET)) {
1066                                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1067                                 break;
1068                         } else {
1069                                 key_control->flags |= FLOW_DIS_FIRST_FRAG;
1070                                 if (!(flags &
1071                                       FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) {
1072                                         fdret = FLOW_DISSECT_RET_OUT_GOOD;
1073                                         break;
1074                                 }
1075                         }
1076                 }
1077
1078                 break;
1079         }
1080         case htons(ETH_P_IPV6): {
1081                 const struct ipv6hdr *iph;
1082                 struct ipv6hdr _iph;
1083
1084                 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
1085                 if (!iph) {
1086                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1087                         break;
1088                 }
1089
1090                 ip_proto = iph->nexthdr;
1091                 nhoff += sizeof(struct ipv6hdr);
1092
1093                 if (dissector_uses_key(flow_dissector,
1094                                        FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
1095                         key_addrs = skb_flow_dissector_target(flow_dissector,
1096                                                               FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1097                                                               target_container);
1098
1099                         memcpy(&key_addrs->v6addrs, &iph->saddr,
1100                                sizeof(key_addrs->v6addrs));
1101                         key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1102                 }
1103
1104                 if ((dissector_uses_key(flow_dissector,
1105                                         FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
1106                      (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
1107                     ip6_flowlabel(iph)) {
1108                         __be32 flow_label = ip6_flowlabel(iph);
1109
1110                         if (dissector_uses_key(flow_dissector,
1111                                                FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
1112                                 key_tags = skb_flow_dissector_target(flow_dissector,
1113                                                                      FLOW_DISSECTOR_KEY_FLOW_LABEL,
1114                                                                      target_container);
1115                                 key_tags->flow_label = ntohl(flow_label);
1116                         }
1117                         if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) {
1118                                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1119                                 break;
1120                         }
1121                 }
1122
1123                 __skb_flow_dissect_ipv6(skb, flow_dissector,
1124                                         target_container, data, iph);
1125
1126                 break;
1127         }
1128         case htons(ETH_P_8021AD):
1129         case htons(ETH_P_8021Q): {
1130                 const struct vlan_hdr *vlan = NULL;
1131                 struct vlan_hdr _vlan;
1132                 __be16 saved_vlan_tpid = proto;
1133
1134                 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX &&
1135                     skb && skb_vlan_tag_present(skb)) {
1136                         proto = skb->protocol;
1137                 } else {
1138                         vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
1139                                                     data, hlen, &_vlan);
1140                         if (!vlan) {
1141                                 fdret = FLOW_DISSECT_RET_OUT_BAD;
1142                                 break;
1143                         }
1144
1145                         proto = vlan->h_vlan_encapsulated_proto;
1146                         nhoff += sizeof(*vlan);
1147                 }
1148
1149                 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) {
1150                         dissector_vlan = FLOW_DISSECTOR_KEY_VLAN;
1151                 } else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) {
1152                         dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN;
1153                 } else {
1154                         fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1155                         break;
1156                 }
1157
1158                 if (dissector_uses_key(flow_dissector, dissector_vlan)) {
1159                         key_vlan = skb_flow_dissector_target(flow_dissector,
1160                                                              dissector_vlan,
1161                                                              target_container);
1162
1163                         if (!vlan) {
1164                                 key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
1165                                 key_vlan->vlan_priority = skb_vlan_tag_get_prio(skb);
1166                         } else {
1167                                 key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
1168                                         VLAN_VID_MASK;
1169                                 key_vlan->vlan_priority =
1170                                         (ntohs(vlan->h_vlan_TCI) &
1171                                          VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
1172                         }
1173                         key_vlan->vlan_tpid = saved_vlan_tpid;
1174                 }
1175
1176                 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1177                 break;
1178         }
1179         case htons(ETH_P_PPP_SES): {
1180                 struct {
1181                         struct pppoe_hdr hdr;
1182                         __be16 proto;
1183                 } *hdr, _hdr;
1184                 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
1185                 if (!hdr) {
1186                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1187                         break;
1188                 }
1189
1190                 proto = hdr->proto;
1191                 nhoff += PPPOE_SES_HLEN;
1192                 switch (proto) {
1193                 case htons(PPP_IP):
1194                         proto = htons(ETH_P_IP);
1195                         fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1196                         break;
1197                 case htons(PPP_IPV6):
1198                         proto = htons(ETH_P_IPV6);
1199                         fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1200                         break;
1201                 default:
1202                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1203                         break;
1204                 }
1205                 break;
1206         }
1207         case htons(ETH_P_TIPC): {
1208                 struct tipc_basic_hdr *hdr, _hdr;
1209
1210                 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr),
1211                                            data, hlen, &_hdr);
1212                 if (!hdr) {
1213                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1214                         break;
1215                 }
1216
1217                 if (dissector_uses_key(flow_dissector,
1218                                        FLOW_DISSECTOR_KEY_TIPC)) {
1219                         key_addrs = skb_flow_dissector_target(flow_dissector,
1220                                                               FLOW_DISSECTOR_KEY_TIPC,
1221                                                               target_container);
1222                         key_addrs->tipckey.key = tipc_hdr_rps_key(hdr);
1223                         key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC;
1224                 }
1225                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1226                 break;
1227         }
1228
1229         case htons(ETH_P_MPLS_UC):
1230         case htons(ETH_P_MPLS_MC):
1231                 fdret = __skb_flow_dissect_mpls(skb, flow_dissector,
1232                                                 target_container, data,
1233                                                 nhoff, hlen, mpls_lse,
1234                                                 &mpls_el);
1235                 nhoff += sizeof(struct mpls_label);
1236                 mpls_lse++;
1237                 break;
1238         case htons(ETH_P_FCOE):
1239                 if ((hlen - nhoff) < FCOE_HEADER_LEN) {
1240                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1241                         break;
1242                 }
1243
1244                 nhoff += FCOE_HEADER_LEN;
1245                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1246                 break;
1247
1248         case htons(ETH_P_ARP):
1249         case htons(ETH_P_RARP):
1250                 fdret = __skb_flow_dissect_arp(skb, flow_dissector,
1251                                                target_container, data,
1252                                                nhoff, hlen);
1253                 break;
1254
1255         case htons(ETH_P_BATMAN):
1256                 fdret = __skb_flow_dissect_batadv(skb, key_control, data,
1257                                                   &proto, &nhoff, hlen, flags);
1258                 break;
1259
1260         case htons(ETH_P_1588): {
1261                 struct ptp_header *hdr, _hdr;
1262
1263                 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
1264                                            hlen, &_hdr);
1265                 if (!hdr) {
1266                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1267                         break;
1268                 }
1269
1270                 nhoff += ntohs(hdr->message_length);
1271                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1272                 break;
1273         }
1274
1275         default:
1276                 fdret = FLOW_DISSECT_RET_OUT_BAD;
1277                 break;
1278         }
1279
1280         /* Process result of proto processing */
1281         switch (fdret) {
1282         case FLOW_DISSECT_RET_OUT_GOOD:
1283                 goto out_good;
1284         case FLOW_DISSECT_RET_PROTO_AGAIN:
1285                 if (skb_flow_dissect_allowed(&num_hdrs))
1286                         goto proto_again;
1287                 goto out_good;
1288         case FLOW_DISSECT_RET_CONTINUE:
1289         case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1290                 break;
1291         case FLOW_DISSECT_RET_OUT_BAD:
1292         default:
1293                 goto out_bad;
1294         }
1295
1296 ip_proto_again:
1297         fdret = FLOW_DISSECT_RET_CONTINUE;
1298
1299         switch (ip_proto) {
1300         case IPPROTO_GRE:
1301                 fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector,
1302                                                target_container, data,
1303                                                &proto, &nhoff, &hlen, flags);
1304                 break;
1305
1306         case NEXTHDR_HOP:
1307         case NEXTHDR_ROUTING:
1308         case NEXTHDR_DEST: {
1309                 u8 _opthdr[2], *opthdr;
1310
1311                 if (proto != htons(ETH_P_IPV6))
1312                         break;
1313
1314                 opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
1315                                               data, hlen, &_opthdr);
1316                 if (!opthdr) {
1317                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1318                         break;
1319                 }
1320
1321                 ip_proto = opthdr[0];
1322                 nhoff += (opthdr[1] + 1) << 3;
1323
1324                 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1325                 break;
1326         }
1327         case NEXTHDR_FRAGMENT: {
1328                 struct frag_hdr _fh, *fh;
1329
1330                 if (proto != htons(ETH_P_IPV6))
1331                         break;
1332
1333                 fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
1334                                           data, hlen, &_fh);
1335
1336                 if (!fh) {
1337                         fdret = FLOW_DISSECT_RET_OUT_BAD;
1338                         break;
1339                 }
1340
1341                 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
1342
1343                 nhoff += sizeof(_fh);
1344                 ip_proto = fh->nexthdr;
1345
1346                 if (!(fh->frag_off & htons(IP6_OFFSET))) {
1347                         key_control->flags |= FLOW_DIS_FIRST_FRAG;
1348                         if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
1349                                 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1350                                 break;
1351                         }
1352                 }
1353
1354                 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1355                 break;
1356         }
1357         case IPPROTO_IPIP:
1358                 proto = htons(ETH_P_IP);
1359
1360                 key_control->flags |= FLOW_DIS_ENCAPSULATION;
1361                 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1362                         fdret = FLOW_DISSECT_RET_OUT_GOOD;
1363                         break;
1364                 }
1365
1366                 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1367                 break;
1368
1369         case IPPROTO_IPV6:
1370                 proto = htons(ETH_P_IPV6);
1371
1372                 key_control->flags |= FLOW_DIS_ENCAPSULATION;
1373                 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1374                         fdret = FLOW_DISSECT_RET_OUT_GOOD;
1375                         break;
1376                 }
1377
1378                 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1379                 break;
1380
1381
1382         case IPPROTO_MPLS:
1383                 proto = htons(ETH_P_MPLS_UC);
1384                 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1385                 break;
1386
1387         case IPPROTO_TCP:
1388                 __skb_flow_dissect_tcp(skb, flow_dissector, target_container,
1389                                        data, nhoff, hlen);
1390                 break;
1391
1392         case IPPROTO_ICMP:
1393         case IPPROTO_ICMPV6:
1394                 __skb_flow_dissect_icmp(skb, flow_dissector, target_container,
1395                                         data, nhoff, hlen);
1396                 break;
1397
1398         default:
1399                 break;
1400         }
1401
1402         if (!(key_control->flags & FLOW_DIS_IS_FRAGMENT))
1403                 __skb_flow_dissect_ports(skb, flow_dissector, target_container,
1404                                          data, nhoff, ip_proto, hlen);
1405
1406         /* Process result of IP proto processing */
1407         switch (fdret) {
1408         case FLOW_DISSECT_RET_PROTO_AGAIN:
1409                 if (skb_flow_dissect_allowed(&num_hdrs))
1410                         goto proto_again;
1411                 break;
1412         case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1413                 if (skb_flow_dissect_allowed(&num_hdrs))
1414                         goto ip_proto_again;
1415                 break;
1416         case FLOW_DISSECT_RET_OUT_GOOD:
1417         case FLOW_DISSECT_RET_CONTINUE:
1418                 break;
1419         case FLOW_DISSECT_RET_OUT_BAD:
1420         default:
1421                 goto out_bad;
1422         }
1423
1424 out_good:
1425         ret = true;
1426
1427 out:
1428         key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
1429         key_basic->n_proto = proto;
1430         key_basic->ip_proto = ip_proto;
1431
1432         return ret;
1433
1434 out_bad:
1435         ret = false;
1436         goto out;
1437 }
1438 EXPORT_SYMBOL(__skb_flow_dissect);
1439
1440 static siphash_key_t hashrnd __read_mostly;
1441 static __always_inline void __flow_hash_secret_init(void)
1442 {
1443         net_get_random_once(&hashrnd, sizeof(hashrnd));
1444 }
1445
1446 static const void *flow_keys_hash_start(const struct flow_keys *flow)
1447 {
1448         BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % SIPHASH_ALIGNMENT);
1449         return &flow->FLOW_KEYS_HASH_START_FIELD;
1450 }
1451
1452 static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
1453 {
1454         size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
1455
1456         BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
1457
1458         switch (flow->control.addr_type) {
1459         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1460                 diff -= sizeof(flow->addrs.v4addrs);
1461                 break;
1462         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1463                 diff -= sizeof(flow->addrs.v6addrs);
1464                 break;
1465         case FLOW_DISSECTOR_KEY_TIPC:
1466                 diff -= sizeof(flow->addrs.tipckey);
1467                 break;
1468         }
1469         return sizeof(*flow) - diff;
1470 }
1471
1472 __be32 flow_get_u32_src(const struct flow_keys *flow)
1473 {
1474         switch (flow->control.addr_type) {
1475         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1476                 return flow->addrs.v4addrs.src;
1477         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1478                 return (__force __be32)ipv6_addr_hash(
1479                         &flow->addrs.v6addrs.src);
1480         case FLOW_DISSECTOR_KEY_TIPC:
1481                 return flow->addrs.tipckey.key;
1482         default:
1483                 return 0;
1484         }
1485 }
1486 EXPORT_SYMBOL(flow_get_u32_src);
1487
1488 __be32 flow_get_u32_dst(const struct flow_keys *flow)
1489 {
1490         switch (flow->control.addr_type) {
1491         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1492                 return flow->addrs.v4addrs.dst;
1493         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1494                 return (__force __be32)ipv6_addr_hash(
1495                         &flow->addrs.v6addrs.dst);
1496         default:
1497                 return 0;
1498         }
1499 }
1500 EXPORT_SYMBOL(flow_get_u32_dst);
1501
1502 /* Sort the source and destination IP (and the ports if the IP are the same),
1503  * to have consistent hash within the two directions
1504  */
1505 static inline void __flow_hash_consistentify(struct flow_keys *keys)
1506 {
1507         int addr_diff, i;
1508
1509         switch (keys->control.addr_type) {
1510         case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1511                 addr_diff = (__force u32)keys->addrs.v4addrs.dst -
1512                             (__force u32)keys->addrs.v4addrs.src;
1513                 if ((addr_diff < 0) ||
1514                     (addr_diff == 0 &&
1515                      ((__force u16)keys->ports.dst <
1516                       (__force u16)keys->ports.src))) {
1517                         swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
1518                         swap(keys->ports.src, keys->ports.dst);
1519                 }
1520                 break;
1521         case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1522                 addr_diff = memcmp(&keys->addrs.v6addrs.dst,
1523                                    &keys->addrs.v6addrs.src,
1524                                    sizeof(keys->addrs.v6addrs.dst));
1525                 if ((addr_diff < 0) ||
1526                     (addr_diff == 0 &&
1527                      ((__force u16)keys->ports.dst <
1528                       (__force u16)keys->ports.src))) {
1529                         for (i = 0; i < 4; i++)
1530                                 swap(keys->addrs.v6addrs.src.s6_addr32[i],
1531                                      keys->addrs.v6addrs.dst.s6_addr32[i]);
1532                         swap(keys->ports.src, keys->ports.dst);
1533                 }
1534                 break;
1535         }
1536 }
1537
1538 static inline u32 __flow_hash_from_keys(struct flow_keys *keys,
1539                                         const siphash_key_t *keyval)
1540 {
1541         u32 hash;
1542
1543         __flow_hash_consistentify(keys);
1544
1545         hash = siphash(flow_keys_hash_start(keys),
1546                        flow_keys_hash_length(keys), keyval);
1547         if (!hash)
1548                 hash = 1;
1549
1550         return hash;
1551 }
1552
1553 u32 flow_hash_from_keys(struct flow_keys *keys)
1554 {
1555         __flow_hash_secret_init();
1556         return __flow_hash_from_keys(keys, &hashrnd);
1557 }
1558 EXPORT_SYMBOL(flow_hash_from_keys);
1559
1560 static inline u32 ___skb_get_hash(const struct sk_buff *skb,
1561                                   struct flow_keys *keys,
1562                                   const siphash_key_t *keyval)
1563 {
1564         skb_flow_dissect_flow_keys(skb, keys,
1565                                    FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1566
1567         return __flow_hash_from_keys(keys, keyval);
1568 }
1569
1570 struct _flow_keys_digest_data {
1571         __be16  n_proto;
1572         u8      ip_proto;
1573         u8      padding;
1574         __be32  ports;
1575         __be32  src;
1576         __be32  dst;
1577 };
1578
1579 void make_flow_keys_digest(struct flow_keys_digest *digest,
1580                            const struct flow_keys *flow)
1581 {
1582         struct _flow_keys_digest_data *data =
1583             (struct _flow_keys_digest_data *)digest;
1584
1585         BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
1586
1587         memset(digest, 0, sizeof(*digest));
1588
1589         data->n_proto = flow->basic.n_proto;
1590         data->ip_proto = flow->basic.ip_proto;
1591         data->ports = flow->ports.ports;
1592         data->src = flow->addrs.v4addrs.src;
1593         data->dst = flow->addrs.v4addrs.dst;
1594 }
1595 EXPORT_SYMBOL(make_flow_keys_digest);
1596
1597 static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
1598
1599 u32 __skb_get_hash_symmetric(const struct sk_buff *skb)
1600 {
1601         struct flow_keys keys;
1602
1603         __flow_hash_secret_init();
1604
1605         memset(&keys, 0, sizeof(keys));
1606         __skb_flow_dissect(NULL, skb, &flow_keys_dissector_symmetric,
1607                            &keys, NULL, 0, 0, 0,
1608                            FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1609
1610         return __flow_hash_from_keys(&keys, &hashrnd);
1611 }
1612 EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
1613
1614 /**
1615  * __skb_get_hash: calculate a flow hash
1616  * @skb: sk_buff to calculate flow hash from
1617  *
1618  * This function calculates a flow hash based on src/dst addresses
1619  * and src/dst port numbers.  Sets hash in skb to non-zero hash value
1620  * on success, zero indicates no valid hash.  Also, sets l4_hash in skb
1621  * if hash is a canonical 4-tuple hash over transport ports.
1622  */
1623 void __skb_get_hash(struct sk_buff *skb)
1624 {
1625         struct flow_keys keys;
1626         u32 hash;
1627
1628         __flow_hash_secret_init();
1629
1630         hash = ___skb_get_hash(skb, &keys, &hashrnd);
1631
1632         __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
1633 }
1634 EXPORT_SYMBOL(__skb_get_hash);
1635
1636 __u32 skb_get_hash_perturb(const struct sk_buff *skb,
1637                            const siphash_key_t *perturb)
1638 {
1639         struct flow_keys keys;
1640
1641         return ___skb_get_hash(skb, &keys, perturb);
1642 }
1643 EXPORT_SYMBOL(skb_get_hash_perturb);
1644
1645 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
1646                    const struct flow_keys_basic *keys, int hlen)
1647 {
1648         u32 poff = keys->control.thoff;
1649
1650         /* skip L4 headers for fragments after the first */
1651         if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
1652             !(keys->control.flags & FLOW_DIS_FIRST_FRAG))
1653                 return poff;
1654
1655         switch (keys->basic.ip_proto) {
1656         case IPPROTO_TCP: {
1657                 /* access doff as u8 to avoid unaligned access */
1658                 const u8 *doff;
1659                 u8 _doff;
1660
1661                 doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
1662                                             data, hlen, &_doff);
1663                 if (!doff)
1664                         return poff;
1665
1666                 poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
1667                 break;
1668         }
1669         case IPPROTO_UDP:
1670         case IPPROTO_UDPLITE:
1671                 poff += sizeof(struct udphdr);
1672                 break;
1673         /* For the rest, we do not really care about header
1674          * extensions at this point for now.
1675          */
1676         case IPPROTO_ICMP:
1677                 poff += sizeof(struct icmphdr);
1678                 break;
1679         case IPPROTO_ICMPV6:
1680                 poff += sizeof(struct icmp6hdr);
1681                 break;
1682         case IPPROTO_IGMP:
1683                 poff += sizeof(struct igmphdr);
1684                 break;
1685         case IPPROTO_DCCP:
1686                 poff += sizeof(struct dccp_hdr);
1687                 break;
1688         case IPPROTO_SCTP:
1689                 poff += sizeof(struct sctphdr);
1690                 break;
1691         }
1692
1693         return poff;
1694 }
1695
1696 /**
1697  * skb_get_poff - get the offset to the payload
1698  * @skb: sk_buff to get the payload offset from
1699  *
1700  * The function will get the offset to the payload as far as it could
1701  * be dissected.  The main user is currently BPF, so that we can dynamically
1702  * truncate packets without needing to push actual payload to the user
1703  * space and can analyze headers only, instead.
1704  */
1705 u32 skb_get_poff(const struct sk_buff *skb)
1706 {
1707         struct flow_keys_basic keys;
1708
1709         if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
1710                                               NULL, 0, 0, 0, 0))
1711                 return 0;
1712
1713         return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
1714 }
1715
1716 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
1717 {
1718         memset(keys, 0, sizeof(*keys));
1719
1720         memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
1721             sizeof(keys->addrs.v6addrs.src));
1722         memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
1723             sizeof(keys->addrs.v6addrs.dst));
1724         keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1725         keys->ports.src = fl6->fl6_sport;
1726         keys->ports.dst = fl6->fl6_dport;
1727         keys->keyid.keyid = fl6->fl6_gre_key;
1728         keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
1729         keys->basic.ip_proto = fl6->flowi6_proto;
1730
1731         return flow_hash_from_keys(keys);
1732 }
1733 EXPORT_SYMBOL(__get_hash_from_flowi6);
1734
1735 static const struct flow_dissector_key flow_keys_dissector_keys[] = {
1736         {
1737                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1738                 .offset = offsetof(struct flow_keys, control),
1739         },
1740         {
1741                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1742                 .offset = offsetof(struct flow_keys, basic),
1743         },
1744         {
1745                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1746                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1747         },
1748         {
1749                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1750                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1751         },
1752         {
1753                 .key_id = FLOW_DISSECTOR_KEY_TIPC,
1754                 .offset = offsetof(struct flow_keys, addrs.tipckey),
1755         },
1756         {
1757                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1758                 .offset = offsetof(struct flow_keys, ports),
1759         },
1760         {
1761                 .key_id = FLOW_DISSECTOR_KEY_VLAN,
1762                 .offset = offsetof(struct flow_keys, vlan),
1763         },
1764         {
1765                 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
1766                 .offset = offsetof(struct flow_keys, tags),
1767         },
1768         {
1769                 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
1770                 .offset = offsetof(struct flow_keys, keyid),
1771         },
1772 };
1773
1774 static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
1775         {
1776                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1777                 .offset = offsetof(struct flow_keys, control),
1778         },
1779         {
1780                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1781                 .offset = offsetof(struct flow_keys, basic),
1782         },
1783         {
1784                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1785                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1786         },
1787         {
1788                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1789                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1790         },
1791         {
1792                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1793                 .offset = offsetof(struct flow_keys, ports),
1794         },
1795 };
1796
1797 static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = {
1798         {
1799                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1800                 .offset = offsetof(struct flow_keys, control),
1801         },
1802         {
1803                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1804                 .offset = offsetof(struct flow_keys, basic),
1805         },
1806 };
1807
1808 struct flow_dissector flow_keys_dissector __read_mostly;
1809 EXPORT_SYMBOL(flow_keys_dissector);
1810
1811 struct flow_dissector flow_keys_basic_dissector __read_mostly;
1812 EXPORT_SYMBOL(flow_keys_basic_dissector);
1813
1814 static int __init init_default_flow_dissectors(void)
1815 {
1816         skb_flow_dissector_init(&flow_keys_dissector,
1817                                 flow_keys_dissector_keys,
1818                                 ARRAY_SIZE(flow_keys_dissector_keys));
1819         skb_flow_dissector_init(&flow_keys_dissector_symmetric,
1820                                 flow_keys_dissector_symmetric_keys,
1821                                 ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
1822         skb_flow_dissector_init(&flow_keys_basic_dissector,
1823                                 flow_keys_basic_dissector_keys,
1824                                 ARRAY_SIZE(flow_keys_basic_dissector_keys));
1825         return 0;
1826 }
1827 core_initcall(init_default_flow_dissectors);