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/sctp.h>
  36 #include <linux/smp.h>
  37 #include <linux/tcp.h>
  38 #include <linux/udp.h>
  39 #include <linux/icmp.h>
  40 #include <linux/icmpv6.h>
  41 #include <linux/rculist.h>
  42 #include <net/ip.h>
  43 #include <net/ipv6.h>
  44 #include <net/ndisc.h>
  45
  46 #include "datapath.h"
  47 #include "flow.h"
  48 #include "flow_netlink.h"
  49
  50 #include "vlan.h"
  51
  52 u64 ovs_flow_used_time(unsigned long flow_jiffies)
  53 {
  54         struct timespec cur_ts;
  55         u64 cur_ms, idle_ms;
  56
  57         ktime_get_ts(&cur_ts);
  58         idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
  59         cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
  60                  cur_ts.tv_nsec / NSEC_PER_MSEC;
  61
  62         return cur_ms - idle_ms;
  63 }
  64
  65 #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
  66
  67 void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
  68                            struct sk_buff *skb)
  69 {
  70         struct flow_stats *stats;
  71         int node = numa_node_id();
  72
  73         stats = rcu_dereference(flow->stats[node]);
  74
  75         /* Check if already have node-specific stats. */
  76         if (likely(stats)) {
  77                 spin_lock(&stats->lock);
  78                 /* Mark if we write on the pre-allocated stats. */
  79                 if (node == 0 && unlikely(flow->stats_last_writer != node))
  80                         flow->stats_last_writer = node;
  81         } else {
  82                 stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
  83                 spin_lock(&stats->lock);
  84
  85                 /* If the current NUMA-node is the only writer on the
  86                  * pre-allocated stats keep using them.
  87                  */
  88                 if (unlikely(flow->stats_last_writer != node)) {
  89                         /* A previous locker may have already allocated the
  90                          * stats, so we need to check again.  If node-specific
  91                          * stats were already allocated, we update the pre-
  92                          * allocated stats as we have already locked them.
  93                          */
  94                         if (likely(flow->stats_last_writer != NUMA_NO_NODE)
  95                             && likely(!rcu_dereference(flow->stats[node]))) {
  96                                 /* Try to allocate node-specific stats. */
  97                                 struct flow_stats *new_stats;
  98
  99                                 new_stats =
 100                                         kmem_cache_alloc_node(flow_stats_cache,
 101                                                               GFP_THISNODE |
 102                                                               __GFP_NOMEMALLOC,
 103                                                               node);
 104                                 if (likely(new_stats)) {
 105                                         new_stats->used = jiffies;
 106                                         new_stats->packet_count = 1;
 107                                         new_stats->byte_count = skb->len;
 108                                         new_stats->tcp_flags = tcp_flags;
 109                                         spin_lock_init(&new_stats->lock);
 110
 111                                         rcu_assign_pointer(flow->stats[node],
 112                                                            new_stats);
 113                                         goto unlock;
 114                                 }
 115                         }
 116                         flow->stats_last_writer = node;
 117                 }
 118         }
 119
 120         stats->used = jiffies;
 121         stats->packet_count++;
 122         stats->byte_count += skb->len;
 123         stats->tcp_flags |= tcp_flags;
 124 unlock:
 125         spin_unlock(&stats->lock);
 126 }
 127
 128 /* Must be called with rcu_read_lock or ovs_mutex. */
 129 void ovs_flow_stats_get(const struct sw_flow *flow,
 130                         struct ovs_flow_stats *ovs_stats,
 131                         unsigned long *used, __be16 *tcp_flags)
 132 {
 133         int node;
 134
 135         *used = 0;
 136         *tcp_flags = 0;
 137         memset(ovs_stats, 0, sizeof(*ovs_stats));
 138
 139         for_each_node(node) {
 140                 struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]);
 141
 142                 if (stats) {
 143                         /* Local CPU may write on non-local stats, so we must
 144                          * block bottom-halves here.
 145                          */
 146                         spin_lock_bh(&stats->lock);
 147                         if (!*used || time_after(stats->used, *used))
 148                                 *used = stats->used;
 149                         *tcp_flags |= stats->tcp_flags;
 150                         ovs_stats->n_packets += stats->packet_count;
 151                         ovs_stats->n_bytes += stats->byte_count;
 152                         spin_unlock_bh(&stats->lock);
 153                 }
 154         }
 155 }
 156
 157 /* Called with ovs_mutex. */
 158 void ovs_flow_stats_clear(struct sw_flow *flow)
 159 {
 160         int node;
 161
 162         for_each_node(node) {
 163                 struct flow_stats *stats = ovsl_dereference(flow->stats[node]);
 164
 165                 if (stats) {
 166                         spin_lock_bh(&stats->lock);
 167                         stats->used = 0;
 168                         stats->packet_count = 0;
 169                         stats->byte_count = 0;
 170                         stats->tcp_flags = 0;
 171                         spin_unlock_bh(&stats->lock);
 172                 }
 173         }
 174 }
 175
 176 static int check_header(struct sk_buff *skb, int len)
 177 {
 178         if (unlikely(skb->len < len))
 179                 return -EINVAL;
 180         if (unlikely(!pskb_may_pull(skb, len)))
 181                 return -ENOMEM;
 182         return 0;
 183 }
 184
 185 static bool arphdr_ok(struct sk_buff *skb)
 186 {
 187         return pskb_may_pull(skb, skb_network_offset(skb) +
 188                                   sizeof(struct arp_eth_header));
 189 }
 190
 191 static int check_iphdr(struct sk_buff *skb)
 192 {
 193         unsigned int nh_ofs = skb_network_offset(skb);
 194         unsigned int ip_len;
 195         int err;
 196
 197         err = check_header(skb, nh_ofs + sizeof(struct iphdr));
 198         if (unlikely(err))
 199                 return err;
 200
 201         ip_len = ip_hdrlen(skb);
 202         if (unlikely(ip_len < sizeof(struct iphdr) ||
 203                      skb->len < nh_ofs + ip_len))
 204                 return -EINVAL;
 205
 206         skb_set_transport_header(skb, nh_ofs + ip_len);
 207         return 0;
 208 }
 209
 210 static bool tcphdr_ok(struct sk_buff *skb)
 211 {
 212         int th_ofs = skb_transport_offset(skb);
 213         int tcp_len;
 214
 215         if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
 216                 return false;
 217
 218         tcp_len = tcp_hdrlen(skb);
 219         if (unlikely(tcp_len < sizeof(struct tcphdr) ||
 220                      skb->len < th_ofs + tcp_len))
 221                 return false;
 222
 223         return true;
 224 }
 225
 226 static bool udphdr_ok(struct sk_buff *skb)
 227 {
 228         return pskb_may_pull(skb, skb_transport_offset(skb) +
 229                                   sizeof(struct udphdr));
 230 }
 231
 232 static bool sctphdr_ok(struct sk_buff *skb)
 233 {
 234         return pskb_may_pull(skb, skb_transport_offset(skb) +
 235                                   sizeof(struct sctphdr));
 236 }
 237
 238 static bool icmphdr_ok(struct sk_buff *skb)
 239 {
 240         return pskb_may_pull(skb, skb_transport_offset(skb) +
 241                                   sizeof(struct icmphdr));
 242 }
 243
 244 static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
 245 {
 246         unsigned int nh_ofs = skb_network_offset(skb);
 247         unsigned int nh_len;
 248         int payload_ofs;
 249         struct ipv6hdr *nh;
 250         uint8_t nexthdr;
 251         __be16 frag_off;
 252         int err;
 253
 254         err = check_header(skb, nh_ofs + sizeof(*nh));
 255         if (unlikely(err))
 256                 return err;
 257
 258         nh = ipv6_hdr(skb);
 259         nexthdr = nh->nexthdr;
 260         payload_ofs = (u8 *)(nh + 1) - skb->data;
 261
 262         key->ip.proto = NEXTHDR_NONE;
 263         key->ip.tos = ipv6_get_dsfield(nh);
 264         key->ip.ttl = nh->hop_limit;
 265         key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
 266         key->ipv6.addr.src = nh->saddr;
 267         key->ipv6.addr.dst = nh->daddr;
 268
 269         payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
 270         if (unlikely(payload_ofs < 0))
 271                 return -EINVAL;
 272
 273         if (frag_off) {
 274                 if (frag_off & htons(~0x7))
 275                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 276                 else
 277                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 278         }
 279
 280         nh_len = payload_ofs - nh_ofs;
 281         skb_set_transport_header(skb, nh_ofs + nh_len);
 282         key->ip.proto = nexthdr;
 283         return nh_len;
 284 }
 285
 286 static bool icmp6hdr_ok(struct sk_buff *skb)
 287 {
 288         return pskb_may_pull(skb, skb_transport_offset(skb) +
 289                                   sizeof(struct icmp6hdr));
 290 }
 291
 292 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
 293 {
 294         struct qtag_prefix {
 295                 __be16 eth_type; /* ETH_P_8021Q */
 296                 __be16 tci;
 297         };
 298         struct qtag_prefix *qp;
 299
 300         if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
 301                 return 0;
 302
 303         if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
 304                                          sizeof(__be16))))
 305                 return -ENOMEM;
 306
 307         qp = (struct qtag_prefix *) skb->data;
 308         key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
 309         __skb_pull(skb, sizeof(struct qtag_prefix));
 310
 311         return 0;
 312 }
 313
 314 static __be16 parse_ethertype(struct sk_buff *skb)
 315 {
 316         struct llc_snap_hdr {
 317                 u8  dsap;  /* Always 0xAA */
 318                 u8  ssap;  /* Always 0xAA */
 319                 u8  ctrl;
 320                 u8  oui[3];
 321                 __be16 ethertype;
 322         };
 323         struct llc_snap_hdr *llc;
 324         __be16 proto;
 325
 326         proto = *(__be16 *) skb->data;
 327         __skb_pull(skb, sizeof(__be16));
 328
 329         if (ntohs(proto) >= ETH_P_802_3_MIN)
 330                 return proto;
 331
 332         if (skb->len < sizeof(struct llc_snap_hdr))
 333                 return htons(ETH_P_802_2);
 334
 335         if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
 336                 return htons(0);
 337
 338         llc = (struct llc_snap_hdr *) skb->data;
 339         if (llc->dsap != LLC_SAP_SNAP ||
 340             llc->ssap != LLC_SAP_SNAP ||
 341             (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
 342                 return htons(ETH_P_802_2);
 343
 344         __skb_pull(skb, sizeof(struct llc_snap_hdr));
 345
 346         if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
 347                 return llc->ethertype;
 348
 349         return htons(ETH_P_802_2);
 350 }
 351
 352 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
 353                         int nh_len)
 354 {
 355         struct icmp6hdr *icmp = icmp6_hdr(skb);
 356
 357         /* The ICMPv6 type and code fields use the 16-bit transport port
 358          * fields, so we need to store them in 16-bit network byte order.
 359          */
 360         key->tp.src = htons(icmp->icmp6_type);
 361         key->tp.dst = htons(icmp->icmp6_code);
 362
 363         if (icmp->icmp6_code == 0 &&
 364             (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
 365              icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 366                 int icmp_len = skb->len - skb_transport_offset(skb);
 367                 struct nd_msg *nd;
 368                 int offset;
 369
 370                 /* In order to process neighbor discovery options, we need the
 371                  * entire packet.
 372                  */
 373                 if (unlikely(icmp_len < sizeof(*nd)))
 374                         return 0;
 375
 376                 if (unlikely(skb_linearize(skb)))
 377                         return -ENOMEM;
 378
 379                 nd = (struct nd_msg *)skb_transport_header(skb);
 380                 key->ipv6.nd.target = nd->target;
 381
 382                 icmp_len -= sizeof(*nd);
 383                 offset = 0;
 384                 while (icmp_len >= 8) {
 385                         struct nd_opt_hdr *nd_opt =
 386                                  (struct nd_opt_hdr *)(nd->opt + offset);
 387                         int opt_len = nd_opt->nd_opt_len * 8;
 388
 389                         if (unlikely(!opt_len || opt_len > icmp_len))
 390                                 return 0;
 391
 392                         /* Store the link layer address if the appropriate
 393                          * option is provided.  It is considered an error if
 394                          * the same link layer option is specified twice.
 395                          */
 396                         if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
 397                             && opt_len == 8) {
 398                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
 399                                         goto invalid;
 400                                 ether_addr_copy(key->ipv6.nd.sll,
 401                                     &nd->opt[offset+sizeof(*nd_opt)]);
 402                         } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
 403                                    && opt_len == 8) {
 404                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
 405                                         goto invalid;
 406                                 ether_addr_copy(key->ipv6.nd.tll,
 407                                     &nd->opt[offset+sizeof(*nd_opt)]);
 408                         }
 409
 410                         icmp_len -= opt_len;
 411                         offset += opt_len;
 412                 }
 413         }
 414
 415         return 0;
 416
 417 invalid:
 418         memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
 419         memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
 420         memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
 421
 422         return 0;
 423 }
 424
 425 /**
 426  * key_extract - extracts a flow key from an Ethernet frame.
 427  * @skb: sk_buff that contains the frame, with skb->data pointing to the
 428  * Ethernet header
 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 static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
 448 {
 449         int error;
 450         struct ethhdr *eth;
 451
 452         skb_reset_mac_header(skb);
 453
 454         /* Link layer.  We are guaranteed to have at least the 14 byte Ethernet
 455          * header in the linear data area.
 456          */
 457         eth = eth_hdr(skb);
 458         ether_addr_copy(key->eth.src, eth->h_source);
 459         ether_addr_copy(key->eth.dst, eth->h_dest);
 460
 461         __skb_pull(skb, 2 * ETH_ALEN);
 462         /* We are going to push all headers that we pull, so no need to
 463          * update skb->csum here. */
 464
 465         if (vlan_tx_tag_present(skb))
 466                 key->eth.tci = htons(vlan_get_tci(skb));
 467         else if (eth->h_proto == htons(ETH_P_8021Q))
 468                 if (unlikely(parse_vlan(skb, key)))
 469                         return -ENOMEM;
 470
 471         key->eth.type = parse_ethertype(skb);
 472         if (unlikely(key->eth.type == htons(0)))
 473                 return -ENOMEM;
 474
 475         skb_reset_network_header(skb);
 476         __skb_push(skb, skb->data - skb_mac_header(skb));
 477
 478         /* Network layer. */
 479         if (key->eth.type == htons(ETH_P_IP)) {
 480                 struct iphdr *nh;
 481                 __be16 offset;
 482
 483                 error = check_iphdr(skb);
 484                 if (unlikely(error)) {
 485                         if (error == -EINVAL) {
 486                                 skb->transport_header = skb->network_header;
 487                                 error = 0;
 488                         }
 489                         return error;
 490                 }
 491
 492                 nh = ip_hdr(skb);
 493                 key->ipv4.addr.src = nh->saddr;
 494                 key->ipv4.addr.dst = nh->daddr;
 495
 496                 key->ip.proto = nh->protocol;
 497                 key->ip.tos = nh->tos;
 498                 key->ip.ttl = nh->ttl;
 499
 500                 offset = nh->frag_off & htons(IP_OFFSET);
 501                 if (offset) {
 502                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 503                         return 0;
 504                 }
 505                 if (nh->frag_off & htons(IP_MF) ||
 506                          skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 507                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 508
 509                 /* Transport layer. */
 510                 if (key->ip.proto == IPPROTO_TCP) {
 511                         if (tcphdr_ok(skb)) {
 512                                 struct tcphdr *tcp = tcp_hdr(skb);
 513                                 key->tp.src = tcp->source;
 514                                 key->tp.dst = tcp->dest;
 515                                 key->tp.flags = TCP_FLAGS_BE16(tcp);
 516                         }
 517                 } else if (key->ip.proto == IPPROTO_UDP) {
 518                         if (udphdr_ok(skb)) {
 519                                 struct udphdr *udp = udp_hdr(skb);
 520                                 key->tp.src = udp->source;
 521                                 key->tp.dst = udp->dest;
 522                         }
 523                 } else if (key->ip.proto == IPPROTO_SCTP) {
 524                         if (sctphdr_ok(skb)) {
 525                                 struct sctphdr *sctp = sctp_hdr(skb);
 526                                 key->tp.src = sctp->source;
 527                                 key->tp.dst = sctp->dest;
 528                         }
 529                 } else if (key->ip.proto == IPPROTO_ICMP) {
 530                         if (icmphdr_ok(skb)) {
 531                                 struct icmphdr *icmp = icmp_hdr(skb);
 532                                 /* The ICMP type and code fields use the 16-bit
 533                                  * transport port fields, so we need to store
 534                                  * them in 16-bit network byte order. */
 535                                 key->tp.src = htons(icmp->type);
 536                                 key->tp.dst = htons(icmp->code);
 537                         }
 538                 }
 539
 540         } else if ((key->eth.type == htons(ETH_P_ARP) ||
 541                    key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) {
 542                 struct arp_eth_header *arp;
 543
 544                 arp = (struct arp_eth_header *)skb_network_header(skb);
 545
 546                 if (arp->ar_hrd == htons(ARPHRD_ETHER)
 547                                 && arp->ar_pro == htons(ETH_P_IP)
 548                                 && arp->ar_hln == ETH_ALEN
 549                                 && arp->ar_pln == 4) {
 550
 551                         /* We only match on the lower 8 bits of the opcode. */
 552                         if (ntohs(arp->ar_op) <= 0xff)
 553                                 key->ip.proto = ntohs(arp->ar_op);
 554                         memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
 555                         memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
 556                         ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
 557                         ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
 558                 }
 559         } else if (key->eth.type == htons(ETH_P_IPV6)) {
 560                 int nh_len;             /* IPv6 Header + Extensions */
 561
 562                 nh_len = parse_ipv6hdr(skb, key);
 563                 if (unlikely(nh_len < 0)) {
 564                         if (nh_len == -EINVAL) {
 565                                 skb->transport_header = skb->network_header;
 566                                 error = 0;
 567                         } else {
 568                                 error = nh_len;
 569                         }
 570                         return error;
 571                 }
 572
 573                 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
 574                         return 0;
 575                 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 576                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 577
 578                 /* Transport layer. */
 579                 if (key->ip.proto == NEXTHDR_TCP) {
 580                         if (tcphdr_ok(skb)) {
 581                                 struct tcphdr *tcp = tcp_hdr(skb);
 582                                 key->tp.src = tcp->source;
 583                                 key->tp.dst = tcp->dest;
 584                                 key->tp.flags = TCP_FLAGS_BE16(tcp);
 585                         }
 586                 } else if (key->ip.proto == NEXTHDR_UDP) {
 587                         if (udphdr_ok(skb)) {
 588                                 struct udphdr *udp = udp_hdr(skb);
 589                                 key->tp.src = udp->source;
 590                                 key->tp.dst = udp->dest;
 591                         }
 592                 } else if (key->ip.proto == NEXTHDR_SCTP) {
 593                         if (sctphdr_ok(skb)) {
 594                                 struct sctphdr *sctp = sctp_hdr(skb);
 595                                 key->tp.src = sctp->source;
 596                                 key->tp.dst = sctp->dest;
 597                         }
 598                 } else if (key->ip.proto == NEXTHDR_ICMP) {
 599                         if (icmp6hdr_ok(skb)) {
 600                                 error = parse_icmpv6(skb, key, nh_len);
 601                                 if (error)
 602                                         return error;
 603                         }
 604                 }
 605         }
 606
 607         return 0;
 608 }
 609
 610 int ovs_flow_key_extract(struct sk_buff *skb, struct sw_flow_key *key)
 611 {
 612         /* Extract metadata from packet. */
 613
 614         memset(key, 0, sizeof(*key));
 615         if (OVS_CB(skb)->tun_key)
 616                 memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key));
 617
 618         key->phy.priority = skb->priority;
 619         key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
 620         key->phy.skb_mark = skb->mark;
 621
 622         return key_extract(skb, key);
 623 }
 624
 625 int ovs_flow_key_extract_userspace(const struct nlattr *attr,
 626                                    struct sk_buff *skb,
 627                                    struct sw_flow_key *key)
 628 {
 629         int err;
 630
 631         memset(key, 0, sizeof(*key));
 632         /* Extract metadata from netlink attributes. */
 633         err = ovs_nla_get_flow_metadata(attr, key);
 634         if (err)
 635                 return err;
 636
 637         return key_extract(skb, key);
 638 }
 639
 640 int ovs_flow_key_extract_recirc(u32 recirc_id,
 641                                 const struct sw_flow_key *key,
 642                                 struct sk_buff *skb,
 643                                 struct sw_flow_key *new_key)
 644 {
 645         memset(new_key, 0, sizeof(*new_key));
 646         memcpy(new_key, key, OVS_SW_FLOW_KEY_METADATA_SIZE);
 647         new_key->recirc_id = recirc_id;
 648         return key_extract(skb, new_key);
 649 }