kernel/net/openvswitch/flow.c

   1 /*
   2  * Copyright (c) 2007-2014 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 <linux/uaccess.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/if_ether.h>
  23 #include <linux/if_vlan.h>
  24 #include <net/llc_pdu.h>
  25 #include <linux/kernel.h>
  26 #include <linux/jhash.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/llc.h>
  29 #include <linux/module.h>
  30 #include <linux/in.h>
  31 #include <linux/rcupdate.h>
  32 #include <linux/if_arp.h>
  33 #include <linux/ip.h>
  34 #include <linux/ipv6.h>
  35 #include <linux/mpls.h>
  36 #include <linux/sctp.h>
  37 #include <linux/smp.h>
  38 #include <linux/tcp.h>
  39 #include <linux/udp.h>
  40 #include <linux/icmp.h>
  41 #include <linux/icmpv6.h>
  42 #include <linux/rculist.h>
  43 #include <net/ip.h>
  44 #include <net/ip_tunnels.h>
  45 #include <net/ipv6.h>
  46 #include <net/mpls.h>
  47 #include <net/ndisc.h>
  48
  49 #include "datapath.h"
  50 #include "flow.h"
  51 #include "flow_netlink.h"
  52
  53 u64 ovs_flow_used_time(unsigned long flow_jiffies)
  54 {
  55         struct timespec cur_ts;
  56         u64 cur_ms, idle_ms;
  57
  58         ktime_get_ts(&cur_ts);
  59         idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
  60         cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
  61                  cur_ts.tv_nsec / NSEC_PER_MSEC;
  62
  63         return cur_ms - idle_ms;
  64 }
  65
  66 #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
  67
  68 void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
  69                            const struct sk_buff *skb)
  70 {
  71         struct flow_stats *stats;
  72         int node = numa_node_id();
  73         int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
  74
  75         stats = rcu_dereference(flow->stats[node]);
  76
  77         /* Check if already have node-specific stats. */
  78         if (likely(stats)) {
  79                 spin_lock(&stats->lock);
  80                 /* Mark if we write on the pre-allocated stats. */
  81                 if (node == 0 && unlikely(flow->stats_last_writer != node))
  82                         flow->stats_last_writer = node;
  83         } else {
  84                 stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
  85                 spin_lock(&stats->lock);
  86
  87                 /* If the current NUMA-node is the only writer on the
  88                  * pre-allocated stats keep using them.
  89                  */
  90                 if (unlikely(flow->stats_last_writer != node)) {
  91                         /* A previous locker may have already allocated the
  92                          * stats, so we need to check again.  If node-specific
  93                          * stats were already allocated, we update the pre-
  94                          * allocated stats as we have already locked them.
  95                          */
  96                         if (likely(flow->stats_last_writer != NUMA_NO_NODE)
  97                             && likely(!rcu_access_pointer(flow->stats[node]))) {
  98                                 /* Try to allocate node-specific stats. */
  99                                 struct flow_stats *new_stats;
 100
 101                                 new_stats =
 102                                         kmem_cache_alloc_node(flow_stats_cache,
 103                                                               GFP_NOWAIT |
 104                                                               __GFP_THISNODE |
 105                                                               __GFP_NOWARN |
 106                                                               __GFP_NOMEMALLOC,
 107                                                               node);
 108                                 if (likely(new_stats)) {
 109                                         new_stats->used = jiffies;
 110                                         new_stats->packet_count = 1;
 111                                         new_stats->byte_count = len;
 112                                         new_stats->tcp_flags = tcp_flags;
 113                                         spin_lock_init(&new_stats->lock);
 114
 115                                         rcu_assign_pointer(flow->stats[node],
 116                                                            new_stats);
 117                                         goto unlock;
 118                                 }
 119                         }
 120                         flow->stats_last_writer = node;
 121                 }
 122         }
 123
 124         stats->used = jiffies;
 125         stats->packet_count++;
 126         stats->byte_count += len;
 127         stats->tcp_flags |= tcp_flags;
 128 unlock:
 129         spin_unlock(&stats->lock);
 130 }
 131
 132 /* Must be called with rcu_read_lock or ovs_mutex. */
 133 void ovs_flow_stats_get(const struct sw_flow *flow,
 134                         struct ovs_flow_stats *ovs_stats,
 135                         unsigned long *used, __be16 *tcp_flags)
 136 {
 137         int node;
 138
 139         *used = 0;
 140         *tcp_flags = 0;
 141         memset(ovs_stats, 0, sizeof(*ovs_stats));
 142
 143         for_each_node(node) {
 144                 struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]);
 145
 146                 if (stats) {
 147                         /* Local CPU may write on non-local stats, so we must
 148                          * block bottom-halves here.
 149                          */
 150                         spin_lock_bh(&stats->lock);
 151                         if (!*used || time_after(stats->used, *used))
 152                                 *used = stats->used;
 153                         *tcp_flags |= stats->tcp_flags;
 154                         ovs_stats->n_packets += stats->packet_count;
 155                         ovs_stats->n_bytes += stats->byte_count;
 156                         spin_unlock_bh(&stats->lock);
 157                 }
 158         }
 159 }
 160
 161 /* Called with ovs_mutex. */
 162 void ovs_flow_stats_clear(struct sw_flow *flow)
 163 {
 164         int node;
 165
 166         for_each_node(node) {
 167                 struct flow_stats *stats = ovsl_dereference(flow->stats[node]);
 168
 169                 if (stats) {
 170                         spin_lock_bh(&stats->lock);
 171                         stats->used = 0;
 172                         stats->packet_count = 0;
 173                         stats->byte_count = 0;
 174                         stats->tcp_flags = 0;
 175                         spin_unlock_bh(&stats->lock);
 176                 }
 177         }
 178 }
 179
 180 static int check_header(struct sk_buff *skb, int len)
 181 {
 182         if (unlikely(skb->len < len))
 183                 return -EINVAL;
 184         if (unlikely(!pskb_may_pull(skb, len)))
 185                 return -ENOMEM;
 186         return 0;
 187 }
 188
 189 static bool arphdr_ok(struct sk_buff *skb)
 190 {
 191         return pskb_may_pull(skb, skb_network_offset(skb) +
 192                                   sizeof(struct arp_eth_header));
 193 }
 194
 195 static int check_iphdr(struct sk_buff *skb)
 196 {
 197         unsigned int nh_ofs = skb_network_offset(skb);
 198         unsigned int ip_len;
 199         int err;
 200
 201         err = check_header(skb, nh_ofs + sizeof(struct iphdr));
 202         if (unlikely(err))
 203                 return err;
 204
 205         ip_len = ip_hdrlen(skb);
 206         if (unlikely(ip_len < sizeof(struct iphdr) ||
 207                      skb->len < nh_ofs + ip_len))
 208                 return -EINVAL;
 209
 210         skb_set_transport_header(skb, nh_ofs + ip_len);
 211         return 0;
 212 }
 213
 214 static bool tcphdr_ok(struct sk_buff *skb)
 215 {
 216         int th_ofs = skb_transport_offset(skb);
 217         int tcp_len;
 218
 219         if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
 220                 return false;
 221
 222         tcp_len = tcp_hdrlen(skb);
 223         if (unlikely(tcp_len < sizeof(struct tcphdr) ||
 224                      skb->len < th_ofs + tcp_len))
 225                 return false;
 226
 227         return true;
 228 }
 229
 230 static bool udphdr_ok(struct sk_buff *skb)
 231 {
 232         return pskb_may_pull(skb, skb_transport_offset(skb) +
 233                                   sizeof(struct udphdr));
 234 }
 235
 236 static bool sctphdr_ok(struct sk_buff *skb)
 237 {
 238         return pskb_may_pull(skb, skb_transport_offset(skb) +
 239                                   sizeof(struct sctphdr));
 240 }
 241
 242 static bool icmphdr_ok(struct sk_buff *skb)
 243 {
 244         return pskb_may_pull(skb, skb_transport_offset(skb) +
 245                                   sizeof(struct icmphdr));
 246 }
 247
 248 static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
 249 {
 250         unsigned int nh_ofs = skb_network_offset(skb);
 251         unsigned int nh_len;
 252         int payload_ofs;
 253         struct ipv6hdr *nh;
 254         uint8_t nexthdr;
 255         __be16 frag_off;
 256         int err;
 257
 258         err = check_header(skb, nh_ofs + sizeof(*nh));
 259         if (unlikely(err))
 260                 return err;
 261
 262         nh = ipv6_hdr(skb);
 263         nexthdr = nh->nexthdr;
 264         payload_ofs = (u8 *)(nh + 1) - skb->data;
 265
 266         key->ip.proto = NEXTHDR_NONE;
 267         key->ip.tos = ipv6_get_dsfield(nh);
 268         key->ip.ttl = nh->hop_limit;
 269         key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
 270         key->ipv6.addr.src = nh->saddr;
 271         key->ipv6.addr.dst = nh->daddr;
 272
 273         payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
 274         if (unlikely(payload_ofs < 0))
 275                 return -EINVAL;
 276
 277         if (frag_off) {
 278                 if (frag_off & htons(~0x7))
 279                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 280                 else
 281                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 282         } else {
 283                 key->ip.frag = OVS_FRAG_TYPE_NONE;
 284         }
 285
 286         nh_len = payload_ofs - nh_ofs;
 287         skb_set_transport_header(skb, nh_ofs + nh_len);
 288         key->ip.proto = nexthdr;
 289         return nh_len;
 290 }
 291
 292 static bool icmp6hdr_ok(struct sk_buff *skb)
 293 {
 294         return pskb_may_pull(skb, skb_transport_offset(skb) +
 295                                   sizeof(struct icmp6hdr));
 296 }
 297
 298 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
 299 {
 300         struct qtag_prefix {
 301                 __be16 eth_type; /* ETH_P_8021Q */
 302                 __be16 tci;
 303         };
 304         struct qtag_prefix *qp;
 305
 306         if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
 307                 return 0;
 308
 309         if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
 310                                          sizeof(__be16))))
 311                 return -ENOMEM;
 312
 313         qp = (struct qtag_prefix *) skb->data;
 314         key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
 315         __skb_pull(skb, sizeof(struct qtag_prefix));
 316
 317         return 0;
 318 }
 319
 320 static __be16 parse_ethertype(struct sk_buff *skb)
 321 {
 322         struct llc_snap_hdr {
 323                 u8  dsap;  /* Always 0xAA */
 324                 u8  ssap;  /* Always 0xAA */
 325                 u8  ctrl;
 326                 u8  oui[3];
 327                 __be16 ethertype;
 328         };
 329         struct llc_snap_hdr *llc;
 330         __be16 proto;
 331
 332         proto = *(__be16 *) skb->data;
 333         __skb_pull(skb, sizeof(__be16));
 334
 335         if (ntohs(proto) >= ETH_P_802_3_MIN)
 336                 return proto;
 337
 338         if (skb->len < sizeof(struct llc_snap_hdr))
 339                 return htons(ETH_P_802_2);
 340
 341         if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
 342                 return htons(0);
 343
 344         llc = (struct llc_snap_hdr *) skb->data;
 345         if (llc->dsap != LLC_SAP_SNAP ||
 346             llc->ssap != LLC_SAP_SNAP ||
 347             (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
 348                 return htons(ETH_P_802_2);
 349
 350         __skb_pull(skb, sizeof(struct llc_snap_hdr));
 351
 352         if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
 353                 return llc->ethertype;
 354
 355         return htons(ETH_P_802_2);
 356 }
 357
 358 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
 359                         int nh_len)
 360 {
 361         struct icmp6hdr *icmp = icmp6_hdr(skb);
 362
 363         /* The ICMPv6 type and code fields use the 16-bit transport port
 364          * fields, so we need to store them in 16-bit network byte order.
 365          */
 366         key->tp.src = htons(icmp->icmp6_type);
 367         key->tp.dst = htons(icmp->icmp6_code);
 368         memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd));
 369
 370         if (icmp->icmp6_code == 0 &&
 371             (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
 372              icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 373                 int icmp_len = skb->len - skb_transport_offset(skb);
 374                 struct nd_msg *nd;
 375                 int offset;
 376
 377                 /* In order to process neighbor discovery options, we need the
 378                  * entire packet.
 379                  */
 380                 if (unlikely(icmp_len < sizeof(*nd)))
 381                         return 0;
 382
 383                 if (unlikely(skb_linearize(skb)))
 384                         return -ENOMEM;
 385
 386                 nd = (struct nd_msg *)skb_transport_header(skb);
 387                 key->ipv6.nd.target = nd->target;
 388
 389                 icmp_len -= sizeof(*nd);
 390                 offset = 0;
 391                 while (icmp_len >= 8) {
 392                         struct nd_opt_hdr *nd_opt =
 393                                  (struct nd_opt_hdr *)(nd->opt + offset);
 394                         int opt_len = nd_opt->nd_opt_len * 8;
 395
 396                         if (unlikely(!opt_len || opt_len > icmp_len))
 397                                 return 0;
 398
 399                         /* Store the link layer address if the appropriate
 400                          * option is provided.  It is considered an error if
 401                          * the same link layer option is specified twice.
 402                          */
 403                         if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
 404                             && opt_len == 8) {
 405                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
 406                                         goto invalid;
 407                                 ether_addr_copy(key->ipv6.nd.sll,
 408                                                 &nd->opt[offset+sizeof(*nd_opt)]);
 409                         } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
 410                                    && opt_len == 8) {
 411                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
 412                                         goto invalid;
 413                                 ether_addr_copy(key->ipv6.nd.tll,
 414                                                 &nd->opt[offset+sizeof(*nd_opt)]);
 415                         }
 416
 417                         icmp_len -= opt_len;
 418                         offset += opt_len;
 419                 }
 420         }
 421
 422         return 0;
 423
 424 invalid:
 425         memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
 426         memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
 427         memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
 428
 429         return 0;
 430 }
 431
 432 /**
 433  * key_extract - extracts a flow key from an Ethernet frame.
 434  * @skb: sk_buff that contains the frame, with skb->data pointing to the
 435  * Ethernet header
 436  * @key: output flow key
 437  *
 438  * The caller must ensure that skb->len >= ETH_HLEN.
 439  *
 440  * Returns 0 if successful, otherwise a negative errno value.
 441  *
 442  * Initializes @skb header pointers as follows:
 443  *
 444  *    - skb->mac_header: the Ethernet header.
 445  *
 446  *    - skb->network_header: just past the Ethernet header, or just past the
 447  *      VLAN header, to the first byte of the Ethernet payload.
 448  *
 449  *    - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
 450  *      on output, then just past the IP header, if one is present and
 451  *      of a correct length, otherwise the same as skb->network_header.
 452  *      For other key->eth.type values it is left untouched.
 453  */
 454 static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
 455 {
 456         int error;
 457         struct ethhdr *eth;
 458
 459         /* Flags are always used as part of stats */
 460         key->tp.flags = 0;
 461
 462         skb_reset_mac_header(skb);
 463
 464         /* Link layer.  We are guaranteed to have at least the 14 byte Ethernet
 465          * header in the linear data area.
 466          */
 467         eth = eth_hdr(skb);
 468         ether_addr_copy(key->eth.src, eth->h_source);
 469         ether_addr_copy(key->eth.dst, eth->h_dest);
 470
 471         __skb_pull(skb, 2 * ETH_ALEN);
 472         /* We are going to push all headers that we pull, so no need to
 473          * update skb->csum here.
 474          */
 475
 476         key->eth.tci = 0;
 477         if (skb_vlan_tag_present(skb))
 478                 key->eth.tci = htons(skb->vlan_tci);
 479         else if (eth->h_proto == htons(ETH_P_8021Q))
 480                 if (unlikely(parse_vlan(skb, key)))
 481                         return -ENOMEM;
 482
 483         key->eth.type = parse_ethertype(skb);
 484         if (unlikely(key->eth.type == htons(0)))
 485                 return -ENOMEM;
 486
 487         skb_reset_network_header(skb);
 488         skb_reset_mac_len(skb);
 489         __skb_push(skb, skb->data - skb_mac_header(skb));
 490
 491         /* Network layer. */
 492         if (key->eth.type == htons(ETH_P_IP)) {
 493                 struct iphdr *nh;
 494                 __be16 offset;
 495
 496                 error = check_iphdr(skb);
 497                 if (unlikely(error)) {
 498                         memset(&key->ip, 0, sizeof(key->ip));
 499                         memset(&key->ipv4, 0, sizeof(key->ipv4));
 500                         if (error == -EINVAL) {
 501                                 skb->transport_header = skb->network_header;
 502                                 error = 0;
 503                         }
 504                         return error;
 505                 }
 506
 507                 nh = ip_hdr(skb);
 508                 key->ipv4.addr.src = nh->saddr;
 509                 key->ipv4.addr.dst = nh->daddr;
 510
 511                 key->ip.proto = nh->protocol;
 512                 key->ip.tos = nh->tos;
 513                 key->ip.ttl = nh->ttl;
 514
 515                 offset = nh->frag_off & htons(IP_OFFSET);
 516                 if (offset) {
 517                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 518                         return 0;
 519                 }
 520                 if (nh->frag_off & htons(IP_MF) ||
 521                         skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 522                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 523                 else
 524                         key->ip.frag = OVS_FRAG_TYPE_NONE;
 525
 526                 /* Transport layer. */
 527                 if (key->ip.proto == IPPROTO_TCP) {
 528                         if (tcphdr_ok(skb)) {
 529                                 struct tcphdr *tcp = tcp_hdr(skb);
 530                                 key->tp.src = tcp->source;
 531                                 key->tp.dst = tcp->dest;
 532                                 key->tp.flags = TCP_FLAGS_BE16(tcp);
 533                         } else {
 534                                 memset(&key->tp, 0, sizeof(key->tp));
 535                         }
 536
 537                 } else if (key->ip.proto == IPPROTO_UDP) {
 538                         if (udphdr_ok(skb)) {
 539                                 struct udphdr *udp = udp_hdr(skb);
 540                                 key->tp.src = udp->source;
 541                                 key->tp.dst = udp->dest;
 542                         } else {
 543                                 memset(&key->tp, 0, sizeof(key->tp));
 544                         }
 545                 } else if (key->ip.proto == IPPROTO_SCTP) {
 546                         if (sctphdr_ok(skb)) {
 547                                 struct sctphdr *sctp = sctp_hdr(skb);
 548                                 key->tp.src = sctp->source;
 549                                 key->tp.dst = sctp->dest;
 550                         } else {
 551                                 memset(&key->tp, 0, sizeof(key->tp));
 552                         }
 553                 } else if (key->ip.proto == IPPROTO_ICMP) {
 554                         if (icmphdr_ok(skb)) {
 555                                 struct icmphdr *icmp = icmp_hdr(skb);
 556                                 /* The ICMP type and code fields use the 16-bit
 557                                  * transport port fields, so we need to store
 558                                  * them in 16-bit network byte order. */
 559                                 key->tp.src = htons(icmp->type);
 560                                 key->tp.dst = htons(icmp->code);
 561                         } else {
 562                                 memset(&key->tp, 0, sizeof(key->tp));
 563                         }
 564                 }
 565
 566         } else if (key->eth.type == htons(ETH_P_ARP) ||
 567                    key->eth.type == htons(ETH_P_RARP)) {
 568                 struct arp_eth_header *arp;
 569                 bool arp_available = arphdr_ok(skb);
 570
 571                 arp = (struct arp_eth_header *)skb_network_header(skb);
 572
 573                 if (arp_available &&
 574                     arp->ar_hrd == htons(ARPHRD_ETHER) &&
 575                     arp->ar_pro == htons(ETH_P_IP) &&
 576                     arp->ar_hln == ETH_ALEN &&
 577                     arp->ar_pln == 4) {
 578
 579                         /* We only match on the lower 8 bits of the opcode. */
 580                         if (ntohs(arp->ar_op) <= 0xff)
 581                                 key->ip.proto = ntohs(arp->ar_op);
 582                         else
 583                                 key->ip.proto = 0;
 584
 585                         memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
 586                         memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
 587                         ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
 588                         ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
 589                 } else {
 590                         memset(&key->ip, 0, sizeof(key->ip));
 591                         memset(&key->ipv4, 0, sizeof(key->ipv4));
 592                 }
 593         } else if (eth_p_mpls(key->eth.type)) {
 594                 size_t stack_len = MPLS_HLEN;
 595
 596                 /* In the presence of an MPLS label stack the end of the L2
 597                  * header and the beginning of the L3 header differ.
 598                  *
 599                  * Advance network_header to the beginning of the L3
 600                  * header. mac_len corresponds to the end of the L2 header.
 601                  */
 602                 while (1) {
 603                         __be32 lse;
 604
 605                         error = check_header(skb, skb->mac_len + stack_len);
 606                         if (unlikely(error))
 607                                 return 0;
 608
 609                         memcpy(&lse, skb_network_header(skb), MPLS_HLEN);
 610
 611                         if (stack_len == MPLS_HLEN)
 612                                 memcpy(&key->mpls.top_lse, &lse, MPLS_HLEN);
 613
 614                         skb_set_network_header(skb, skb->mac_len + stack_len);
 615                         if (lse & htonl(MPLS_LS_S_MASK))
 616                                 break;
 617
 618                         stack_len += MPLS_HLEN;
 619                 }
 620         } else if (key->eth.type == htons(ETH_P_IPV6)) {
 621                 int nh_len;             /* IPv6 Header + Extensions */
 622
 623                 nh_len = parse_ipv6hdr(skb, key);
 624                 if (unlikely(nh_len < 0)) {
 625                         memset(&key->ip, 0, sizeof(key->ip));
 626                         memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr));
 627                         if (nh_len == -EINVAL) {
 628                                 skb->transport_header = skb->network_header;
 629                                 error = 0;
 630                         } else {
 631                                 error = nh_len;
 632                         }
 633                         return error;
 634                 }
 635
 636                 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
 637                         return 0;
 638                 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 639                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 640
 641                 /* Transport layer. */
 642                 if (key->ip.proto == NEXTHDR_TCP) {
 643                         if (tcphdr_ok(skb)) {
 644                                 struct tcphdr *tcp = tcp_hdr(skb);
 645                                 key->tp.src = tcp->source;
 646                                 key->tp.dst = tcp->dest;
 647                                 key->tp.flags = TCP_FLAGS_BE16(tcp);
 648                         } else {
 649                                 memset(&key->tp, 0, sizeof(key->tp));
 650                         }
 651                 } else if (key->ip.proto == NEXTHDR_UDP) {
 652                         if (udphdr_ok(skb)) {
 653                                 struct udphdr *udp = udp_hdr(skb);
 654                                 key->tp.src = udp->source;
 655                                 key->tp.dst = udp->dest;
 656                         } else {
 657                                 memset(&key->tp, 0, sizeof(key->tp));
 658                         }
 659                 } else if (key->ip.proto == NEXTHDR_SCTP) {
 660                         if (sctphdr_ok(skb)) {
 661                                 struct sctphdr *sctp = sctp_hdr(skb);
 662                                 key->tp.src = sctp->source;
 663                                 key->tp.dst = sctp->dest;
 664                         } else {
 665                                 memset(&key->tp, 0, sizeof(key->tp));
 666                         }
 667                 } else if (key->ip.proto == NEXTHDR_ICMP) {
 668                         if (icmp6hdr_ok(skb)) {
 669                                 error = parse_icmpv6(skb, key, nh_len);
 670                                 if (error)
 671                                         return error;
 672                         } else {
 673                                 memset(&key->tp, 0, sizeof(key->tp));
 674                         }
 675                 }
 676         }
 677         return 0;
 678 }
 679
 680 int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
 681 {
 682         return key_extract(skb, key);
 683 }
 684
 685 int ovs_flow_key_extract(const struct ovs_tunnel_info *tun_info,
 686                          struct sk_buff *skb, struct sw_flow_key *key)
 687 {
 688         /* Extract metadata from packet. */
 689         if (tun_info) {
 690                 memcpy(&key->tun_key, &tun_info->tunnel, sizeof(key->tun_key));
 691
 692                 if (tun_info->options) {
 693                         BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) *
 694                                                    8)) - 1
 695                                         > sizeof(key->tun_opts));
 696                         memcpy(TUN_METADATA_OPTS(key, tun_info->options_len),
 697                                tun_info->options, tun_info->options_len);
 698                         key->tun_opts_len = tun_info->options_len;
 699                 } else {
 700                         key->tun_opts_len = 0;
 701                 }
 702         } else  {
 703                 key->tun_opts_len = 0;
 704                 memset(&key->tun_key, 0, sizeof(key->tun_key));
 705         }
 706
 707         key->phy.priority = skb->priority;
 708         key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
 709         key->phy.skb_mark = skb->mark;
 710         key->ovs_flow_hash = 0;
 711         key->recirc_id = 0;
 712
 713         return key_extract(skb, key);
 714 }
 715
 716 int ovs_flow_key_extract_userspace(const struct nlattr *attr,
 717                                    struct sk_buff *skb,
 718                                    struct sw_flow_key *key, bool log)
 719 {
 720         int err;
 721
 722         memset(key, 0, OVS_SW_FLOW_KEY_METADATA_SIZE);
 723
 724         /* Extract metadata from netlink attributes. */
 725         err = ovs_nla_get_flow_metadata(attr, key, log);
 726         if (err)
 727                 return err;
 728
 729         return key_extract(skb, key);
 730 }