datapath/flow.c

   1 /*
   2  * Copyright (c) 2007-2013 Nicira, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #include "flow.h"
  20 #include "datapath.h"
  21 #include <linux/uaccess.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/etherdevice.h>
  24 #include <linux/if_ether.h>
  25 #include <linux/if_vlan.h>
  26 #include <net/llc_pdu.h>
  27 #include <linux/kernel.h>
  28 #include <linux/jhash.h>
  29 #include <linux/jiffies.h>
  30 #include <linux/llc.h>
  31 #include <linux/module.h>
  32 #include <linux/in.h>
  33 #include <linux/rcupdate.h>
  34 #include <linux/if_arp.h>
  35 #include <linux/ip.h>
  36 #include <linux/ipv6.h>
  37 #include <linux/sctp.h>
  38 #include <linux/smp.h>
  39 #include <linux/tcp.h>
  40 #include <linux/udp.h>
  41 #include <linux/icmp.h>
  42 #include <linux/icmpv6.h>
  43 #include <linux/rculist.h>
  44 #include <net/ip.h>
  45 #include <net/ipv6.h>
  46 #include <net/ndisc.h>
  47
  48 #include "vlan.h"
  49
  50 u64 ovs_flow_used_time(unsigned long flow_jiffies)
  51 {
  52         struct timespec cur_ts;
  53         u64 cur_ms, idle_ms;
  54
  55         ktime_get_ts(&cur_ts);
  56         idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
  57         cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
  58                  cur_ts.tv_nsec / NSEC_PER_MSEC;
  59
  60         return cur_ms - idle_ms;
  61 }
  62
  63 #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
  64
  65 void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb)
  66 {
  67         struct flow_stats *stats;
  68         __be16 tcp_flags = 0;
  69
  70         if (!flow->stats.is_percpu)
  71                 stats = flow->stats.stat;
  72         else
  73                 stats = this_cpu_ptr(flow->stats.cpu_stats);
  74
  75         if ((flow->key.eth.type == htons(ETH_P_IP) ||
  76              flow->key.eth.type == htons(ETH_P_IPV6)) &&
  77             flow->key.ip.frag != OVS_FRAG_TYPE_LATER &&
  78             flow->key.ip.proto == IPPROTO_TCP &&
  79             likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) {
  80                 tcp_flags = TCP_FLAGS_BE16(tcp_hdr(skb));
  81         }
  82
  83         spin_lock(&stats->lock);
  84         stats->used = jiffies;
  85         stats->packet_count++;
  86         stats->byte_count += skb->len;
  87         stats->tcp_flags |= tcp_flags;
  88         spin_unlock(&stats->lock);
  89 }
  90
  91 static void stats_read(struct flow_stats *stats, bool lock_bh,
  92                        struct ovs_flow_stats *ovs_stats,
  93                        unsigned long *used, __be16 *tcp_flags)
  94 {
  95         if (lock_bh)
  96                 spin_lock_bh(&stats->lock);
  97         else
  98                 spin_lock(&stats->lock);
  99
 100         if (time_after(stats->used, *used))
 101                 *used = stats->used;
 102         *tcp_flags |= stats->tcp_flags;
 103         ovs_stats->n_packets += stats->packet_count;
 104         ovs_stats->n_bytes += stats->byte_count;
 105
 106         if (lock_bh)
 107                 spin_unlock_bh(&stats->lock);
 108         else
 109                 spin_unlock(&stats->lock);
 110 }
 111
 112 void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *ovs_stats,
 113                         unsigned long *used, __be16 *tcp_flags)
 114 {
 115         int cpu, cur_cpu;
 116
 117         *used = 0;
 118         *tcp_flags = 0;
 119         memset(ovs_stats, 0, sizeof(*ovs_stats));
 120
 121         if (!flow->stats.is_percpu) {
 122                 stats_read(flow->stats.stat, true, ovs_stats, used, tcp_flags);
 123         } else {
 124                 cur_cpu = get_cpu();
 125
 126                 for_each_possible_cpu(cpu) {
 127                         struct flow_stats *stats;
 128                         bool lock_bh;
 129
 130                         stats = per_cpu_ptr(flow->stats.cpu_stats, cpu);
 131                         lock_bh = (cpu == cur_cpu);
 132                         stats_read(stats, lock_bh, ovs_stats, used, tcp_flags);
 133                 }
 134                 put_cpu();
 135         }
 136 }
 137
 138 static void stats_reset(struct flow_stats *stats, bool lock_bh)
 139 {
 140         if (lock_bh)
 141                 spin_lock_bh(&stats->lock);
 142         else
 143                 spin_lock(&stats->lock);
 144
 145         stats->used = 0;
 146         stats->packet_count = 0;
 147         stats->byte_count = 0;
 148         stats->tcp_flags = 0;
 149
 150         if (lock_bh)
 151                 spin_unlock_bh(&stats->lock);
 152         else
 153                 spin_unlock(&stats->lock);
 154 }
 155
 156 void ovs_flow_stats_clear(struct sw_flow *flow)
 157 {
 158         int cpu, cur_cpu;
 159
 160         if (!flow->stats.is_percpu) {
 161                 stats_reset(flow->stats.stat, true);
 162         } else {
 163                 cur_cpu = get_cpu();
 164
 165                 for_each_possible_cpu(cpu) {
 166                         bool lock_bh;
 167
 168                         lock_bh = (cpu == cur_cpu);
 169                         stats_reset(per_cpu_ptr(flow->stats.cpu_stats, cpu), lock_bh);
 170                 }
 171                 put_cpu();
 172         }
 173 }
 174
 175 static int check_header(struct sk_buff *skb, int len)
 176 {
 177         if (unlikely(skb->len < len))
 178                 return -EINVAL;
 179         if (unlikely(!pskb_may_pull(skb, len)))
 180                 return -ENOMEM;
 181         return 0;
 182 }
 183
 184 static bool arphdr_ok(struct sk_buff *skb)
 185 {
 186         return pskb_may_pull(skb, skb_network_offset(skb) +
 187                                   sizeof(struct arp_eth_header));
 188 }
 189
 190 static int check_iphdr(struct sk_buff *skb)
 191 {
 192         unsigned int nh_ofs = skb_network_offset(skb);
 193         unsigned int ip_len;
 194         int err;
 195
 196         err = check_header(skb, nh_ofs + sizeof(struct iphdr));
 197         if (unlikely(err))
 198                 return err;
 199
 200         ip_len = ip_hdrlen(skb);
 201         if (unlikely(ip_len < sizeof(struct iphdr) ||
 202                      skb->len < nh_ofs + ip_len))
 203                 return -EINVAL;
 204
 205         skb_set_transport_header(skb, nh_ofs + ip_len);
 206         return 0;
 207 }
 208
 209 static bool tcphdr_ok(struct sk_buff *skb)
 210 {
 211         int th_ofs = skb_transport_offset(skb);
 212         int tcp_len;
 213
 214         if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
 215                 return false;
 216
 217         tcp_len = tcp_hdrlen(skb);
 218         if (unlikely(tcp_len < sizeof(struct tcphdr) ||
 219                      skb->len < th_ofs + tcp_len))
 220                 return false;
 221
 222         return true;
 223 }
 224
 225 static bool udphdr_ok(struct sk_buff *skb)
 226 {
 227         return pskb_may_pull(skb, skb_transport_offset(skb) +
 228                                   sizeof(struct udphdr));
 229 }
 230
 231 static bool sctphdr_ok(struct sk_buff *skb)
 232 {
 233         return pskb_may_pull(skb, skb_transport_offset(skb) +
 234                                   sizeof(struct sctphdr));
 235 }
 236
 237 static bool icmphdr_ok(struct sk_buff *skb)
 238 {
 239         return pskb_may_pull(skb, skb_transport_offset(skb) +
 240                                   sizeof(struct icmphdr));
 241 }
 242
 243 static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
 244 {
 245         unsigned int nh_ofs = skb_network_offset(skb);
 246         unsigned int nh_len;
 247         int payload_ofs;
 248         struct ipv6hdr *nh;
 249         uint8_t nexthdr;
 250         __be16 frag_off;
 251         int err;
 252
 253         err = check_header(skb, nh_ofs + sizeof(*nh));
 254         if (unlikely(err))
 255                 return err;
 256
 257         nh = ipv6_hdr(skb);
 258         nexthdr = nh->nexthdr;
 259         payload_ofs = (u8 *)(nh + 1) - skb->data;
 260
 261         key->ip.proto = NEXTHDR_NONE;
 262         key->ip.tos = ipv6_get_dsfield(nh);
 263         key->ip.ttl = nh->hop_limit;
 264         key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
 265         key->ipv6.addr.src = nh->saddr;
 266         key->ipv6.addr.dst = nh->daddr;
 267
 268         payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
 269         if (unlikely(payload_ofs < 0))
 270                 return -EINVAL;
 271
 272         if (frag_off) {
 273                 if (frag_off & htons(~0x7))
 274                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 275                 else
 276                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 277         }
 278
 279         nh_len = payload_ofs - nh_ofs;
 280         skb_set_transport_header(skb, nh_ofs + nh_len);
 281         key->ip.proto = nexthdr;
 282         return nh_len;
 283 }
 284
 285 static bool icmp6hdr_ok(struct sk_buff *skb)
 286 {
 287         return pskb_may_pull(skb, skb_transport_offset(skb) +
 288                                   sizeof(struct icmp6hdr));
 289 }
 290
 291 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
 292 {
 293         struct qtag_prefix {
 294                 __be16 eth_type; /* ETH_P_8021Q */
 295                 __be16 tci;
 296         };
 297         struct qtag_prefix *qp;
 298
 299         if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
 300                 return 0;
 301
 302         if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
 303                                          sizeof(__be16))))
 304                 return -ENOMEM;
 305
 306         qp = (struct qtag_prefix *) skb->data;
 307         key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
 308         __skb_pull(skb, sizeof(struct qtag_prefix));
 309
 310         return 0;
 311 }
 312
 313 static __be16 parse_ethertype(struct sk_buff *skb)
 314 {
 315         struct llc_snap_hdr {
 316                 u8  dsap;  /* Always 0xAA */
 317                 u8  ssap;  /* Always 0xAA */
 318                 u8  ctrl;
 319                 u8  oui[3];
 320                 __be16 ethertype;
 321         };
 322         struct llc_snap_hdr *llc;
 323         __be16 proto;
 324
 325         proto = *(__be16 *) skb->data;
 326         __skb_pull(skb, sizeof(__be16));
 327
 328         if (ntohs(proto) >= ETH_P_802_3_MIN)
 329                 return proto;
 330
 331         if (skb->len < sizeof(struct llc_snap_hdr))
 332                 return htons(ETH_P_802_2);
 333
 334         if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
 335                 return htons(0);
 336
 337         llc = (struct llc_snap_hdr *) skb->data;
 338         if (llc->dsap != LLC_SAP_SNAP ||
 339             llc->ssap != LLC_SAP_SNAP ||
 340             (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
 341                 return htons(ETH_P_802_2);
 342
 343         __skb_pull(skb, sizeof(struct llc_snap_hdr));
 344
 345         if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
 346                 return llc->ethertype;
 347
 348         return htons(ETH_P_802_2);
 349 }
 350
 351 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
 352                         int nh_len)
 353 {
 354         struct icmp6hdr *icmp = icmp6_hdr(skb);
 355
 356         /* The ICMPv6 type and code fields use the 16-bit transport port
 357          * fields, so we need to store them in 16-bit network byte order.
 358          */
 359         key->ipv6.tp.src = htons(icmp->icmp6_type);
 360         key->ipv6.tp.dst = htons(icmp->icmp6_code);
 361
 362         if (icmp->icmp6_code == 0 &&
 363             (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
 364              icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 365                 int icmp_len = skb->len - skb_transport_offset(skb);
 366                 struct nd_msg *nd;
 367                 int offset;
 368
 369                 /* In order to process neighbor discovery options, we need the
 370                  * entire packet.
 371                  */
 372                 if (unlikely(icmp_len < sizeof(*nd)))
 373                         return 0;
 374
 375                 if (unlikely(skb_linearize(skb)))
 376                         return -ENOMEM;
 377
 378                 nd = (struct nd_msg *)skb_transport_header(skb);
 379                 key->ipv6.nd.target = nd->target;
 380
 381                 icmp_len -= sizeof(*nd);
 382                 offset = 0;
 383                 while (icmp_len >= 8) {
 384                         struct nd_opt_hdr *nd_opt =
 385                                  (struct nd_opt_hdr *)(nd->opt + offset);
 386                         int opt_len = nd_opt->nd_opt_len * 8;
 387
 388                         if (unlikely(!opt_len || opt_len > icmp_len))
 389                                 return 0;
 390
 391                         /* Store the link layer address if the appropriate
 392                          * option is provided.  It is considered an error if
 393                          * the same link layer option is specified twice.
 394                          */
 395                         if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
 396                             && opt_len == 8) {
 397                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
 398                                         goto invalid;
 399                                 memcpy(key->ipv6.nd.sll,
 400                                     &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
 401                         } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
 402                                    && opt_len == 8) {
 403                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
 404                                         goto invalid;
 405                                 memcpy(key->ipv6.nd.tll,
 406                                     &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
 407                         }
 408
 409                         icmp_len -= opt_len;
 410                         offset += opt_len;
 411                 }
 412         }
 413
 414         return 0;
 415
 416 invalid:
 417         memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
 418         memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
 419         memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
 420
 421         return 0;
 422 }
 423
 424 /**
 425  * ovs_flow_extract - extracts a flow key from an Ethernet frame.
 426  * @skb: sk_buff that contains the frame, with skb->data pointing to the
 427  * Ethernet header
 428  * @in_port: port number on which @skb was received.
 429  * @key: output flow key
 430  *
 431  * The caller must ensure that skb->len >= ETH_HLEN.
 432  *
 433  * Returns 0 if successful, otherwise a negative errno value.
 434  *
 435  * Initializes @skb header pointers as follows:
 436  *
 437  *    - skb->mac_header: the Ethernet header.
 438  *
 439  *    - skb->network_header: just past the Ethernet header, or just past the
 440  *      VLAN header, to the first byte of the Ethernet payload.
 441  *
 442  *    - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
 443  *      on output, then just past the IP header, if one is present and
 444  *      of a correct length, otherwise the same as skb->network_header.
 445  *      For other key->eth.type values it is left untouched.
 446  */
 447 int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
 448 {
 449         int error;
 450         struct ethhdr *eth;
 451
 452         memset(key, 0, sizeof(*key));
 453
 454         key->phy.priority = skb->priority;
 455         if (OVS_CB(skb)->tun_key)
 456                 memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key));
 457         key->phy.in_port = in_port;
 458         key->phy.skb_mark = skb->mark;
 459
 460         skb_reset_mac_header(skb);
 461
 462         /* Link layer.  We are guaranteed to have at least the 14 byte Ethernet
 463          * header in the linear data area.
 464          */
 465         eth = eth_hdr(skb);
 466         memcpy(key->eth.src, eth->h_source, ETH_ALEN);
 467         memcpy(key->eth.dst, eth->h_dest, ETH_ALEN);
 468
 469         __skb_pull(skb, 2 * ETH_ALEN);
 470         /* We are going to push all headers that we pull, so no need to
 471          * update skb->csum here. */
 472
 473         if (vlan_tx_tag_present(skb))
 474                 key->eth.tci = htons(vlan_get_tci(skb));
 475         else if (eth->h_proto == htons(ETH_P_8021Q))
 476                 if (unlikely(parse_vlan(skb, key)))
 477                         return -ENOMEM;
 478
 479         key->eth.type = parse_ethertype(skb);
 480         if (unlikely(key->eth.type == htons(0)))
 481                 return -ENOMEM;
 482
 483         skb_reset_network_header(skb);
 484         __skb_push(skb, skb->data - skb_mac_header(skb));
 485
 486         /* Network layer. */
 487         if (key->eth.type == htons(ETH_P_IP)) {
 488                 struct iphdr *nh;
 489                 __be16 offset;
 490
 491                 error = check_iphdr(skb);
 492                 if (unlikely(error)) {
 493                         if (error == -EINVAL) {
 494                                 skb->transport_header = skb->network_header;
 495                                 error = 0;
 496                         }
 497                         return error;
 498                 }
 499
 500                 nh = ip_hdr(skb);
 501                 key->ipv4.addr.src = nh->saddr;
 502                 key->ipv4.addr.dst = nh->daddr;
 503
 504                 key->ip.proto = nh->protocol;
 505                 key->ip.tos = nh->tos;
 506                 key->ip.ttl = nh->ttl;
 507
 508                 offset = nh->frag_off & htons(IP_OFFSET);
 509                 if (offset) {
 510                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 511                         return 0;
 512                 }
 513                 if (nh->frag_off & htons(IP_MF) ||
 514                          skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 515                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 516
 517                 /* Transport layer. */
 518                 if (key->ip.proto == IPPROTO_TCP) {
 519                         if (tcphdr_ok(skb)) {
 520                                 struct tcphdr *tcp = tcp_hdr(skb);
 521                                 key->ipv4.tp.src = tcp->source;
 522                                 key->ipv4.tp.dst = tcp->dest;
 523                                 key->ipv4.tp.flags = TCP_FLAGS_BE16(tcp);
 524                         }
 525                 } else if (key->ip.proto == IPPROTO_UDP) {
 526                         if (udphdr_ok(skb)) {
 527                                 struct udphdr *udp = udp_hdr(skb);
 528                                 key->ipv4.tp.src = udp->source;
 529                                 key->ipv4.tp.dst = udp->dest;
 530                         }
 531                 } else if (key->ip.proto == IPPROTO_SCTP) {
 532                         if (sctphdr_ok(skb)) {
 533                                 struct sctphdr *sctp = sctp_hdr(skb);
 534                                 key->ipv4.tp.src = sctp->source;
 535                                 key->ipv4.tp.dst = sctp->dest;
 536                         }
 537                 } else if (key->ip.proto == IPPROTO_ICMP) {
 538                         if (icmphdr_ok(skb)) {
 539                                 struct icmphdr *icmp = icmp_hdr(skb);
 540                                 /* The ICMP type and code fields use the 16-bit
 541                                  * transport port fields, so we need to store
 542                                  * them in 16-bit network byte order. */
 543                                 key->ipv4.tp.src = htons(icmp->type);
 544                                 key->ipv4.tp.dst = htons(icmp->code);
 545                         }
 546                 }
 547
 548         } else if ((key->eth.type == htons(ETH_P_ARP) ||
 549                    key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) {
 550                 struct arp_eth_header *arp;
 551
 552                 arp = (struct arp_eth_header *)skb_network_header(skb);
 553
 554                 if (arp->ar_hrd == htons(ARPHRD_ETHER)
 555                                 && arp->ar_pro == htons(ETH_P_IP)
 556                                 && arp->ar_hln == ETH_ALEN
 557                                 && arp->ar_pln == 4) {
 558
 559                         /* We only match on the lower 8 bits of the opcode. */
 560                         if (ntohs(arp->ar_op) <= 0xff)
 561                                 key->ip.proto = ntohs(arp->ar_op);
 562                         memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
 563                         memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
 564                         memcpy(key->ipv4.arp.sha, arp->ar_sha, ETH_ALEN);
 565                         memcpy(key->ipv4.arp.tha, arp->ar_tha, ETH_ALEN);
 566                 }
 567         } else if (key->eth.type == htons(ETH_P_IPV6)) {
 568                 int nh_len;             /* IPv6 Header + Extensions */
 569
 570                 nh_len = parse_ipv6hdr(skb, key);
 571                 if (unlikely(nh_len < 0)) {
 572                         if (nh_len == -EINVAL) {
 573                                 skb->transport_header = skb->network_header;
 574                                 error = 0;
 575                         } else {
 576                                 error = nh_len;
 577                         }
 578                         return error;
 579                 }
 580
 581                 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
 582                         return 0;
 583                 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 584                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 585
 586                 /* Transport layer. */
 587                 if (key->ip.proto == NEXTHDR_TCP) {
 588                         if (tcphdr_ok(skb)) {
 589                                 struct tcphdr *tcp = tcp_hdr(skb);
 590                                 key->ipv6.tp.src = tcp->source;
 591                                 key->ipv6.tp.dst = tcp->dest;
 592                                 key->ipv6.tp.flags = TCP_FLAGS_BE16(tcp);
 593                         }
 594                 } else if (key->ip.proto == NEXTHDR_UDP) {
 595                         if (udphdr_ok(skb)) {
 596                                 struct udphdr *udp = udp_hdr(skb);
 597                                 key->ipv6.tp.src = udp->source;
 598                                 key->ipv6.tp.dst = udp->dest;
 599                         }
 600                 } else if (key->ip.proto == NEXTHDR_SCTP) {
 601                         if (sctphdr_ok(skb)) {
 602                                 struct sctphdr *sctp = sctp_hdr(skb);
 603                                 key->ipv6.tp.src = sctp->source;
 604                                 key->ipv6.tp.dst = sctp->dest;
 605                         }
 606                 } else if (key->ip.proto == NEXTHDR_ICMP) {
 607                         if (icmp6hdr_ok(skb)) {
 608                                 error = parse_icmpv6(skb, key, nh_len);
 609                                 if (error)
 610                                         return error;
 611                         }
 612                 }
 613         }
 614
 615         return 0;
 616 }