datapath/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/ipv6.h>
  45 #include <net/mpls.h>
  46 #include <net/ndisc.h>
  47
  48 #include "datapath.h"
  49 #include "flow.h"
  50 #include "flow_netlink.h"
  51
  52 #include "vlan.h"
  53
  54 u64 ovs_flow_used_time(unsigned long flow_jiffies)
  55 {
  56         struct timespec cur_ts;
  57         u64 cur_ms, idle_ms;
  58
  59         ktime_get_ts(&cur_ts);
  60         idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
  61         cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
  62                  cur_ts.tv_nsec / NSEC_PER_MSEC;
  63
  64         return cur_ms - idle_ms;
  65 }
  66
  67 #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
  68
  69 void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
  70                            const struct sk_buff *skb)
  71 {
  72         struct flow_stats *stats;
  73         int node = numa_node_id();
  74         int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
  75
  76         stats = rcu_dereference(flow->stats[node]);
  77
  78         /* Check if already have node-specific stats. */
  79         if (likely(stats)) {
  80                 spin_lock(&stats->lock);
  81                 /* Mark if we write on the pre-allocated stats. */
  82                 if (node == 0 && unlikely(flow->stats_last_writer != node))
  83                         flow->stats_last_writer = node;
  84         } else {
  85                 stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
  86                 spin_lock(&stats->lock);
  87
  88                 /* If the current NUMA-node is the only writer on the
  89                  * pre-allocated stats keep using them.
  90                  */
  91                 if (unlikely(flow->stats_last_writer != node)) {
  92                         /* A previous locker may have already allocated the
  93                          * stats, so we need to check again.  If node-specific
  94                          * stats were already allocated, we update the pre-
  95                          * allocated stats as we have already locked them.
  96                          */
  97                         if (likely(flow->stats_last_writer != NUMA_NO_NODE)
  98                             && likely(!rcu_access_pointer(flow->stats[node]))) {
  99                                 /* Try to allocate node-specific stats. */
 100                                 struct flow_stats *new_stats;
 101
 102                                 new_stats =
 103                                         kmem_cache_alloc_node(flow_stats_cache,
 104                                                               GFP_NOWAIT |
 105                                                               __GFP_THISNODE |
 106                                                               __GFP_NOWARN |
 107                                                               __GFP_NOMEMALLOC,
 108                                                               node);
 109                                 if (likely(new_stats)) {
 110                                         new_stats->used = jiffies;
 111                                         new_stats->packet_count = 1;
 112                                         new_stats->byte_count = len;
 113                                         new_stats->tcp_flags = tcp_flags;
 114                                         spin_lock_init(&new_stats->lock);
 115
 116                                         rcu_assign_pointer(flow->stats[node],
 117                                                            new_stats);
 118                                         goto unlock;
 119                                 }
 120                         }
 121                         flow->stats_last_writer = node;
 122                 }
 123         }
 124
 125         stats->used = jiffies;
 126         stats->packet_count++;
 127         stats->byte_count += len;
 128         stats->tcp_flags |= tcp_flags;
 129 unlock:
 130         spin_unlock(&stats->lock);
 131 }
 132
 133 /* Must be called with rcu_read_lock or ovs_mutex. */
 134 void ovs_flow_stats_get(const struct sw_flow *flow,
 135                         struct ovs_flow_stats *ovs_stats,
 136                         unsigned long *used, __be16 *tcp_flags)
 137 {
 138         int node;
 139
 140         *used = 0;
 141         *tcp_flags = 0;
 142         memset(ovs_stats, 0, sizeof(*ovs_stats));
 143
 144         for_each_node(node) {
 145                 struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]);
 146
 147                 if (stats) {
 148                         /* Local CPU may write on non-local stats, so we must
 149                          * block bottom-halves here.
 150                          */
 151                         spin_lock_bh(&stats->lock);
 152                         if (!*used || time_after(stats->used, *used))
 153                                 *used = stats->used;
 154                         *tcp_flags |= stats->tcp_flags;
 155                         ovs_stats->n_packets += stats->packet_count;
 156                         ovs_stats->n_bytes += stats->byte_count;
 157                         spin_unlock_bh(&stats->lock);
 158                 }
 159         }
 160 }
 161
 162 /* Called with ovs_mutex. */
 163 void ovs_flow_stats_clear(struct sw_flow *flow)
 164 {
 165         int node;
 166
 167         for_each_node(node) {
 168                 struct flow_stats *stats = ovsl_dereference(flow->stats[node]);
 169
 170                 if (stats) {
 171                         spin_lock_bh(&stats->lock);
 172                         stats->used = 0;
 173                         stats->packet_count = 0;
 174                         stats->byte_count = 0;
 175                         stats->tcp_flags = 0;
 176                         spin_unlock_bh(&stats->lock);
 177                 }
 178         }
 179 }
 180
 181 static int check_header(struct sk_buff *skb, int len)
 182 {
 183         if (unlikely(skb->len < len))
 184                 return -EINVAL;
 185         if (unlikely(!pskb_may_pull(skb, len)))
 186                 return -ENOMEM;
 187         return 0;
 188 }
 189
 190 static bool arphdr_ok(struct sk_buff *skb)
 191 {
 192         return pskb_may_pull(skb, skb_network_offset(skb) +
 193                                   sizeof(struct arp_eth_header));
 194 }
 195
 196 static int check_iphdr(struct sk_buff *skb)
 197 {
 198         unsigned int nh_ofs = skb_network_offset(skb);
 199         unsigned int ip_len;
 200         int err;
 201
 202         err = check_header(skb, nh_ofs + sizeof(struct iphdr));
 203         if (unlikely(err))
 204                 return err;
 205
 206         ip_len = ip_hdrlen(skb);
 207         if (unlikely(ip_len < sizeof(struct iphdr) ||
 208                      skb->len < nh_ofs + ip_len))
 209                 return -EINVAL;
 210
 211         skb_set_transport_header(skb, nh_ofs + ip_len);
 212         return 0;
 213 }
 214
 215 static bool tcphdr_ok(struct sk_buff *skb)
 216 {
 217         int th_ofs = skb_transport_offset(skb);
 218         int tcp_len;
 219
 220         if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
 221                 return false;
 222
 223         tcp_len = tcp_hdrlen(skb);
 224         if (unlikely(tcp_len < sizeof(struct tcphdr) ||
 225                      skb->len < th_ofs + tcp_len))
 226                 return false;
 227
 228         return true;
 229 }
 230
 231 static bool udphdr_ok(struct sk_buff *skb)
 232 {
 233         return pskb_may_pull(skb, skb_transport_offset(skb) +
 234                                   sizeof(struct udphdr));
 235 }
 236
 237 static bool sctphdr_ok(struct sk_buff *skb)
 238 {
 239         return pskb_may_pull(skb, skb_transport_offset(skb) +
 240                                   sizeof(struct sctphdr));
 241 }
 242
 243 static bool icmphdr_ok(struct sk_buff *skb)
 244 {
 245         return pskb_may_pull(skb, skb_transport_offset(skb) +
 246                                   sizeof(struct icmphdr));
 247 }
 248
 249 static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
 250 {
 251         unsigned int nh_ofs = skb_network_offset(skb);
 252         unsigned int nh_len;
 253         int payload_ofs;
 254         struct ipv6hdr *nh;
 255         uint8_t nexthdr;
 256         __be16 frag_off;
 257         int err;
 258
 259         err = check_header(skb, nh_ofs + sizeof(*nh));
 260         if (unlikely(err))
 261                 return err;
 262
 263         nh = ipv6_hdr(skb);
 264         nexthdr = nh->nexthdr;
 265         payload_ofs = (u8 *)(nh + 1) - skb->data;
 266
 267         key->ip.proto = NEXTHDR_NONE;
 268         key->ip.tos = ipv6_get_dsfield(nh);
 269         key->ip.ttl = nh->hop_limit;
 270         key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
 271         key->ipv6.addr.src = nh->saddr;
 272         key->ipv6.addr.dst = nh->daddr;
 273
 274         payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
 275         if (unlikely(payload_ofs < 0))
 276                 return -EINVAL;
 277
 278         if (frag_off) {
 279                 if (frag_off & htons(~0x7))
 280                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 281                 else
 282                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 283         } else {
 284                 key->ip.frag = OVS_FRAG_TYPE_NONE;
 285         }
 286
 287         nh_len = payload_ofs - nh_ofs;
 288         skb_set_transport_header(skb, nh_ofs + nh_len);
 289         key->ip.proto = nexthdr;
 290         return nh_len;
 291 }
 292
 293 static bool icmp6hdr_ok(struct sk_buff *skb)
 294 {
 295         return pskb_may_pull(skb, skb_transport_offset(skb) +
 296                                   sizeof(struct icmp6hdr));
 297 }
 298
 299 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
 300 {
 301         struct qtag_prefix {
 302                 __be16 eth_type; /* ETH_P_8021Q */
 303                 __be16 tci;
 304         };
 305         struct qtag_prefix *qp;
 306
 307         if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
 308                 return 0;
 309
 310         if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
 311                                          sizeof(__be16))))
 312                 return -ENOMEM;
 313
 314         qp = (struct qtag_prefix *) skb->data;
 315         key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
 316         __skb_pull(skb, sizeof(struct qtag_prefix));
 317
 318         return 0;
 319 }
 320
 321 static __be16 parse_ethertype(struct sk_buff *skb)
 322 {
 323         struct llc_snap_hdr {
 324                 u8  dsap;  /* Always 0xAA */
 325                 u8  ssap;  /* Always 0xAA */
 326                 u8  ctrl;
 327                 u8  oui[3];
 328                 __be16 ethertype;
 329         };
 330         struct llc_snap_hdr *llc;
 331         __be16 proto;
 332
 333         proto = *(__be16 *) skb->data;
 334         __skb_pull(skb, sizeof(__be16));
 335
 336         if (eth_proto_is_802_3(proto))
 337                 return proto;
 338
 339         if (skb->len < sizeof(struct llc_snap_hdr))
 340                 return htons(ETH_P_802_2);
 341
 342         if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
 343                 return htons(0);
 344
 345         llc = (struct llc_snap_hdr *) skb->data;
 346         if (llc->dsap != LLC_SAP_SNAP ||
 347             llc->ssap != LLC_SAP_SNAP ||
 348             (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
 349                 return htons(ETH_P_802_2);
 350
 351         __skb_pull(skb, sizeof(struct llc_snap_hdr));
 352
 353         if (eth_proto_is_802_3(llc->ethertype))
 354                 return llc->ethertype;
 355
 356         return htons(ETH_P_802_2);
 357 }
 358
 359 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
 360                         int nh_len)
 361 {
 362         struct icmp6hdr *icmp = icmp6_hdr(skb);
 363
 364         /* The ICMPv6 type and code fields use the 16-bit transport port
 365          * fields, so we need to store them in 16-bit network byte order.
 366          */
 367         key->tp.src = htons(icmp->icmp6_type);
 368         key->tp.dst = htons(icmp->icmp6_code);
 369         memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd));
 370
 371         if (icmp->icmp6_code == 0 &&
 372             (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
 373              icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 374                 int icmp_len = skb->len - skb_transport_offset(skb);
 375                 struct nd_msg *nd;
 376                 int offset;
 377
 378                 /* In order to process neighbor discovery options, we need the
 379                  * entire packet.
 380                  */
 381                 if (unlikely(icmp_len < sizeof(*nd)))
 382                         return 0;
 383
 384                 if (unlikely(skb_linearize(skb)))
 385                         return -ENOMEM;
 386
 387                 nd = (struct nd_msg *)skb_transport_header(skb);
 388                 key->ipv6.nd.target = nd->target;
 389
 390                 icmp_len -= sizeof(*nd);
 391                 offset = 0;
 392                 while (icmp_len >= 8) {
 393                         struct nd_opt_hdr *nd_opt =
 394                                  (struct nd_opt_hdr *)(nd->opt + offset);
 395                         int opt_len = nd_opt->nd_opt_len * 8;
 396
 397                         if (unlikely(!opt_len || opt_len > icmp_len))
 398                                 return 0;
 399
 400                         /* Store the link layer address if the appropriate
 401                          * option is provided.  It is considered an error if
 402                          * the same link layer option is specified twice.
 403                          */
 404                         if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
 405                             && opt_len == 8) {
 406                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
 407                                         goto invalid;
 408                                 ether_addr_copy(key->ipv6.nd.sll,
 409                                                 &nd->opt[offset+sizeof(*nd_opt)]);
 410                         } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
 411                                    && opt_len == 8) {
 412                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
 413                                         goto invalid;
 414                                 ether_addr_copy(key->ipv6.nd.tll,
 415                                                 &nd->opt[offset+sizeof(*nd_opt)]);
 416                         }
 417
 418                         icmp_len -= opt_len;
 419                         offset += opt_len;
 420                 }
 421         }
 422
 423         return 0;
 424
 425 invalid:
 426         memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
 427         memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
 428         memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
 429
 430         return 0;
 431 }
 432
 433 /**
 434  * key_extract - extracts a flow key from an Ethernet frame.
 435  * @skb: sk_buff that contains the frame, with skb->data pointing to the
 436  * Ethernet header
 437  * @key: output flow key
 438  *
 439  * The caller must ensure that skb->len >= ETH_HLEN.
 440  *
 441  * Returns 0 if successful, otherwise a negative errno value.
 442  *
 443  * Initializes @skb header pointers as follows:
 444  *
 445  *    - skb->mac_header: the Ethernet header.
 446  *
 447  *    - skb->network_header: just past the Ethernet header, or just past the
 448  *      VLAN header, to the first byte of the Ethernet payload.
 449  *
 450  *    - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
 451  *      on output, then just past the IP header, if one is present and
 452  *      of a correct length, otherwise the same as skb->network_header.
 453  *      For other key->eth.type values it is left untouched.
 454  */
 455 static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
 456 {
 457         int error;
 458         struct ethhdr *eth;
 459
 460         /* Flags are always used as part of stats */
 461         key->tp.flags = 0;
 462
 463         skb_reset_mac_header(skb);
 464
 465         /* Link layer.  We are guaranteed to have at least the 14 byte Ethernet
 466          * header in the linear data area.
 467          */
 468         eth = eth_hdr(skb);
 469         ether_addr_copy(key->eth.src, eth->h_source);
 470         ether_addr_copy(key->eth.dst, eth->h_dest);
 471
 472         __skb_pull(skb, 2 * ETH_ALEN);
 473         /* We are going to push all headers that we pull, so no need to
 474          * update skb->csum here.
 475          */
 476
 477         key->eth.tci = 0;
 478         if (skb_vlan_tag_present(skb))
 479                 key->eth.tci = htons(vlan_get_tci(skb));
 480         else if (eth->h_proto == htons(ETH_P_8021Q))
 481                 if (unlikely(parse_vlan(skb, key)))
 482                         return -ENOMEM;
 483
 484         key->eth.type = parse_ethertype(skb);
 485         if (unlikely(key->eth.type == htons(0)))
 486                 return -ENOMEM;
 487
 488         skb_reset_network_header(skb);
 489         skb_reset_mac_len(skb);
 490         __skb_push(skb, skb->data - skb_mac_header(skb));
 491
 492         /* Network layer. */
 493         if (key->eth.type == htons(ETH_P_IP)) {
 494                 struct iphdr *nh;
 495                 __be16 offset;
 496
 497                 error = check_iphdr(skb);
 498                 if (unlikely(error)) {
 499                         memset(&key->ip, 0, sizeof(key->ip));
 500                         memset(&key->ipv4, 0, sizeof(key->ipv4));
 501                         if (error == -EINVAL) {
 502                                 skb->transport_header = skb->network_header;
 503                                 error = 0;
 504                         }
 505                         return error;
 506                 }
 507
 508                 nh = ip_hdr(skb);
 509                 key->ipv4.addr.src = nh->saddr;
 510                 key->ipv4.addr.dst = nh->daddr;
 511
 512                 key->ip.proto = nh->protocol;
 513                 key->ip.tos = nh->tos;
 514                 key->ip.ttl = nh->ttl;
 515
 516                 offset = nh->frag_off & htons(IP_OFFSET);
 517                 if (offset) {
 518                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 519                         return 0;
 520                 }
 521                 if (nh->frag_off & htons(IP_MF) ||
 522                         skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 523                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 524                 else
 525                         key->ip.frag = OVS_FRAG_TYPE_NONE;
 526
 527                 /* Transport layer. */
 528                 if (key->ip.proto == IPPROTO_TCP) {
 529                         if (tcphdr_ok(skb)) {
 530                                 struct tcphdr *tcp = tcp_hdr(skb);
 531                                 key->tp.src = tcp->source;
 532                                 key->tp.dst = tcp->dest;
 533                                 key->tp.flags = TCP_FLAGS_BE16(tcp);
 534                         } else {
 535                                 memset(&key->tp, 0, sizeof(key->tp));
 536                         }
 537
 538                 } else if (key->ip.proto == IPPROTO_UDP) {
 539                         if (udphdr_ok(skb)) {
 540                                 struct udphdr *udp = udp_hdr(skb);
 541                                 key->tp.src = udp->source;
 542                                 key->tp.dst = udp->dest;
 543                         } else {
 544                                 memset(&key->tp, 0, sizeof(key->tp));
 545                         }
 546                 } else if (key->ip.proto == IPPROTO_SCTP) {
 547                         if (sctphdr_ok(skb)) {
 548                                 struct sctphdr *sctp = sctp_hdr(skb);
 549                                 key->tp.src = sctp->source;
 550                                 key->tp.dst = sctp->dest;
 551                         } else {
 552                                 memset(&key->tp, 0, sizeof(key->tp));
 553                         }
 554                 } else if (key->ip.proto == IPPROTO_ICMP) {
 555                         if (icmphdr_ok(skb)) {
 556                                 struct icmphdr *icmp = icmp_hdr(skb);
 557                                 /* The ICMP type and code fields use the 16-bit
 558                                  * transport port fields, so we need to store
 559                                  * them in 16-bit network byte order.
 560                                  */
 561                                 key->tp.src = htons(icmp->type);
 562                                 key->tp.dst = htons(icmp->code);
 563                         } else {
 564                                 memset(&key->tp, 0, sizeof(key->tp));
 565                         }
 566                 }
 567
 568         } else if (key->eth.type == htons(ETH_P_ARP) ||
 569                    key->eth.type == htons(ETH_P_RARP)) {
 570                 struct arp_eth_header *arp;
 571                 bool arp_available = arphdr_ok(skb);
 572
 573                 arp = (struct arp_eth_header *)skb_network_header(skb);
 574
 575                 if (arp_available &&
 576                     arp->ar_hrd == htons(ARPHRD_ETHER) &&
 577                     arp->ar_pro == htons(ETH_P_IP) &&
 578                     arp->ar_hln == ETH_ALEN &&
 579                     arp->ar_pln == 4) {
 580
 581                         /* We only match on the lower 8 bits of the opcode. */
 582                         if (ntohs(arp->ar_op) <= 0xff)
 583                                 key->ip.proto = ntohs(arp->ar_op);
 584                         else
 585                                 key->ip.proto = 0;
 586
 587                         memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
 588                         memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
 589                         ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
 590                         ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
 591                 } else {
 592                         memset(&key->ip, 0, sizeof(key->ip));
 593                         memset(&key->ipv4, 0, sizeof(key->ipv4));
 594                 }
 595         } else if (eth_p_mpls(key->eth.type)) {
 596                 size_t stack_len = MPLS_HLEN;
 597
 598                 /* In the presence of an MPLS label stack the end of the L2
 599                  * header and the beginning of the L3 header differ.
 600                  *
 601                  * Advance network_header to the beginning of the L3
 602                  * header. mac_len corresponds to the end of the L2 header.
 603                  */
 604                 while (1) {
 605                         __be32 lse;
 606
 607                         error = check_header(skb, skb->mac_len + stack_len);
 608                         if (unlikely(error))
 609                                 return 0;
 610
 611                         memcpy(&lse, skb_network_header(skb), MPLS_HLEN);
 612
 613                         if (stack_len == MPLS_HLEN)
 614                                 memcpy(&key->mpls.top_lse, &lse, MPLS_HLEN);
 615
 616                         skb_set_network_header(skb, skb->mac_len + stack_len);
 617                         if (lse & htonl(MPLS_LS_S_MASK))
 618                                 break;
 619
 620                         stack_len += MPLS_HLEN;
 621                 }
 622         } else if (key->eth.type == htons(ETH_P_IPV6)) {
 623                 int nh_len;             /* IPv6 Header + Extensions */
 624
 625                 nh_len = parse_ipv6hdr(skb, key);
 626                 if (unlikely(nh_len < 0)) {
 627                         memset(&key->ip, 0, sizeof(key->ip));
 628                         memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr));
 629                         if (nh_len == -EINVAL) {
 630                                 skb->transport_header = skb->network_header;
 631                                 error = 0;
 632                         } else {
 633                                 error = nh_len;
 634                         }
 635                         return error;
 636                 }
 637
 638                 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
 639                         return 0;
 640                 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 641                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 642
 643                 /* Transport layer. */
 644                 if (key->ip.proto == NEXTHDR_TCP) {
 645                         if (tcphdr_ok(skb)) {
 646                                 struct tcphdr *tcp = tcp_hdr(skb);
 647                                 key->tp.src = tcp->source;
 648                                 key->tp.dst = tcp->dest;
 649                                 key->tp.flags = TCP_FLAGS_BE16(tcp);
 650                         } else {
 651                                 memset(&key->tp, 0, sizeof(key->tp));
 652                         }
 653                 } else if (key->ip.proto == NEXTHDR_UDP) {
 654                         if (udphdr_ok(skb)) {
 655                                 struct udphdr *udp = udp_hdr(skb);
 656                                 key->tp.src = udp->source;
 657                                 key->tp.dst = udp->dest;
 658                         } else {
 659                                 memset(&key->tp, 0, sizeof(key->tp));
 660                         }
 661                 } else if (key->ip.proto == NEXTHDR_SCTP) {
 662                         if (sctphdr_ok(skb)) {
 663                                 struct sctphdr *sctp = sctp_hdr(skb);
 664                                 key->tp.src = sctp->source;
 665                                 key->tp.dst = sctp->dest;
 666                         } else {
 667                                 memset(&key->tp, 0, sizeof(key->tp));
 668                         }
 669                 } else if (key->ip.proto == NEXTHDR_ICMP) {
 670                         if (icmp6hdr_ok(skb)) {
 671                                 error = parse_icmpv6(skb, key, nh_len);
 672                                 if (error)
 673                                         return error;
 674                         } else {
 675                                 memset(&key->tp, 0, sizeof(key->tp));
 676                         }
 677                 }
 678         }
 679         return 0;
 680 }
 681
 682 int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
 683 {
 684         return key_extract(skb, key);
 685 }
 686
 687 int ovs_flow_key_extract(const struct ovs_tunnel_info *tun_info,
 688                          struct sk_buff *skb, struct sw_flow_key *key)
 689 {
 690         /* Extract metadata from packet. */
 691         if (tun_info) {
 692                 memcpy(&key->tun_key, &tun_info->tunnel, sizeof(key->tun_key));
 693
 694                 BUILD_BUG_ON(((1 << (sizeof(tun_info->options_len) * 8)) - 1) >
 695                              sizeof(key->tun_opts));
 696
 697                 if (tun_info->options) {
 698                         memcpy(TUN_METADATA_OPTS(key, tun_info->options_len),
 699                                tun_info->options, tun_info->options_len);
 700                         key->tun_opts_len = tun_info->options_len;
 701                 } else {
 702                         key->tun_opts_len = 0;
 703                 }
 704         } else {
 705                 key->tun_opts_len = 0;
 706                 memset(&key->tun_key, 0, sizeof(key->tun_key));
 707         }
 708
 709         key->phy.priority = skb->priority;
 710         key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
 711         key->phy.skb_mark = skb->mark;
 712         key->ovs_flow_hash = 0;
 713         key->recirc_id = 0;
 714
 715         return key_extract(skb, key);
 716 }
 717
 718 int ovs_flow_key_extract_userspace(const struct nlattr *attr,
 719                                    struct sk_buff *skb,
 720                                    struct sw_flow_key *key, bool log)
 721 {
 722         int err;
 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 }