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/ip_tunnels.h> 44 #include <net/ipv6.h> 45 #include <net/ndisc.h> 46 47 #include "datapath.h" 48 #include "flow.h" 49 #include "flow_netlink.h" 50 51 u64 ovs_flow_used_time(unsigned long flow_jiffies) 52 { 53 struct timespec cur_ts; 54 u64 cur_ms, idle_ms; 55 56 ktime_get_ts(&cur_ts); 57 idle_ms = jiffies_to_msecs(jiffies - flow_jiffies); 58 cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC + 59 cur_ts.tv_nsec / NSEC_PER_MSEC; 60 61 return cur_ms - idle_ms; 62 } 63 64 #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF)) 65 66 void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags, 67 struct sk_buff *skb) 68 { 69 struct flow_stats *stats; 70 int node = numa_node_id(); 71 72 stats = rcu_dereference(flow->stats[node]); 73 74 /* Check if already have node-specific stats. */ 75 if (likely(stats)) { 76 spin_lock(&stats->lock); 77 /* Mark if we write on the pre-allocated stats. */ 78 if (node == 0 && unlikely(flow->stats_last_writer != node)) 79 flow->stats_last_writer = node; 80 } else { 81 stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */ 82 spin_lock(&stats->lock); 83 84 /* If the current NUMA-node is the only writer on the 85 * pre-allocated stats keep using them. 86 */ 87 if (unlikely(flow->stats_last_writer != node)) { 88 /* A previous locker may have already allocated the 89 * stats, so we need to check again. If node-specific 90 * stats were already allocated, we update the pre- 91 * allocated stats as we have already locked them. 92 */ 93 if (likely(flow->stats_last_writer != NUMA_NO_NODE) 94 && likely(!rcu_access_pointer(flow->stats[node]))) { 95 /* Try to allocate node-specific stats. */ 96 struct flow_stats *new_stats; 97 98 new_stats = 99 kmem_cache_alloc_node(flow_stats_cache, 100 GFP_THISNODE | 101 __GFP_NOMEMALLOC, 102 node); 103 if (likely(new_stats)) { 104 new_stats->used = jiffies; 105 new_stats->packet_count = 1; 106 new_stats->byte_count = skb->len; 107 new_stats->tcp_flags = tcp_flags; 108 spin_lock_init(&new_stats->lock); 109 110 rcu_assign_pointer(flow->stats[node], 111 new_stats); 112 goto unlock; 113 } 114 } 115 flow->stats_last_writer = node; 116 } 117 } 118 119 stats->used = jiffies; 120 stats->packet_count++; 121 stats->byte_count += skb->len; 122 stats->tcp_flags |= tcp_flags; 123 unlock: 124 spin_unlock(&stats->lock); 125 } 126 127 /* Must be called with rcu_read_lock or ovs_mutex. */ 128 void ovs_flow_stats_get(const struct sw_flow *flow, 129 struct ovs_flow_stats *ovs_stats, 130 unsigned long *used, __be16 *tcp_flags) 131 { 132 int node; 133 134 *used = 0; 135 *tcp_flags = 0; 136 memset(ovs_stats, 0, sizeof(*ovs_stats)); 137 138 for_each_node(node) { 139 struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]); 140 141 if (stats) { 142 /* Local CPU may write on non-local stats, so we must 143 * block bottom-halves here. 144 */ 145 spin_lock_bh(&stats->lock); 146 if (!*used || time_after(stats->used, *used)) 147 *used = stats->used; 148 *tcp_flags |= stats->tcp_flags; 149 ovs_stats->n_packets += stats->packet_count; 150 ovs_stats->n_bytes += stats->byte_count; 151 spin_unlock_bh(&stats->lock); 152 } 153 } 154 } 155 156 /* Called with ovs_mutex. */ 157 void ovs_flow_stats_clear(struct sw_flow *flow) 158 { 159 int node; 160 161 for_each_node(node) { 162 struct flow_stats *stats = ovsl_dereference(flow->stats[node]); 163 164 if (stats) { 165 spin_lock_bh(&stats->lock); 166 stats->used = 0; 167 stats->packet_count = 0; 168 stats->byte_count = 0; 169 stats->tcp_flags = 0; 170 spin_unlock_bh(&stats->lock); 171 } 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->tp.src = htons(icmp->icmp6_type); 360 key->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 ether_addr_copy(key->ipv6.nd.sll, 400 &nd->opt[offset+sizeof(*nd_opt)]); 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 ether_addr_copy(key->ipv6.nd.tll, 406 &nd->opt[offset+sizeof(*nd_opt)]); 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 * key_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 * @key: output flow key 429 * 430 * The caller must ensure that skb->len >= ETH_HLEN. 431 * 432 * Returns 0 if successful, otherwise a negative errno value. 433 * 434 * Initializes @skb header pointers as follows: 435 * 436 * - skb->mac_header: the Ethernet header. 437 * 438 * - skb->network_header: just past the Ethernet header, or just past the 439 * VLAN header, to the first byte of the Ethernet payload. 440 * 441 * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6 442 * on output, then just past the IP header, if one is present and 443 * of a correct length, otherwise the same as skb->network_header. 444 * For other key->eth.type values it is left untouched. 445 */ 446 static int key_extract(struct sk_buff *skb, struct sw_flow_key *key) 447 { 448 int error; 449 struct ethhdr *eth; 450 451 /* Flags are always used as part of stats */ 452 key->tp.flags = 0; 453 454 skb_reset_mac_header(skb); 455 456 /* Link layer. We are guaranteed to have at least the 14 byte Ethernet 457 * header in the linear data area. 458 */ 459 eth = eth_hdr(skb); 460 ether_addr_copy(key->eth.src, eth->h_source); 461 ether_addr_copy(key->eth.dst, eth->h_dest); 462 463 __skb_pull(skb, 2 * ETH_ALEN); 464 /* We are going to push all headers that we pull, so no need to 465 * update skb->csum here. 466 */ 467 468 key->eth.tci = 0; 469 if (vlan_tx_tag_present(skb)) 470 key->eth.tci = htons(skb->vlan_tci); 471 else if (eth->h_proto == htons(ETH_P_8021Q)) 472 if (unlikely(parse_vlan(skb, key))) 473 return -ENOMEM; 474 475 key->eth.type = parse_ethertype(skb); 476 if (unlikely(key->eth.type == htons(0))) 477 return -ENOMEM; 478 479 skb_reset_network_header(skb); 480 __skb_push(skb, skb->data - skb_mac_header(skb)); 481 482 /* Network layer. */ 483 if (key->eth.type == htons(ETH_P_IP)) { 484 struct iphdr *nh; 485 __be16 offset; 486 487 error = check_iphdr(skb); 488 if (unlikely(error)) { 489 memset(&key->ip, 0, sizeof(key->ip)); 490 memset(&key->ipv4, 0, sizeof(key->ipv4)); 491 if (error == -EINVAL) { 492 skb->transport_header = skb->network_header; 493 error = 0; 494 } 495 return error; 496 } 497 498 nh = ip_hdr(skb); 499 key->ipv4.addr.src = nh->saddr; 500 key->ipv4.addr.dst = nh->daddr; 501 502 key->ip.proto = nh->protocol; 503 key->ip.tos = nh->tos; 504 key->ip.ttl = nh->ttl; 505 506 offset = nh->frag_off & htons(IP_OFFSET); 507 if (offset) { 508 key->ip.frag = OVS_FRAG_TYPE_LATER; 509 return 0; 510 } 511 if (nh->frag_off & htons(IP_MF) || 512 skb_shinfo(skb)->gso_type & SKB_GSO_UDP) 513 key->ip.frag = OVS_FRAG_TYPE_FIRST; 514 else 515 key->ip.frag = OVS_FRAG_TYPE_NONE; 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->tp.src = tcp->source; 522 key->tp.dst = tcp->dest; 523 key->tp.flags = TCP_FLAGS_BE16(tcp); 524 } else { 525 memset(&key->tp, 0, sizeof(key->tp)); 526 } 527 528 } else if (key->ip.proto == IPPROTO_UDP) { 529 if (udphdr_ok(skb)) { 530 struct udphdr *udp = udp_hdr(skb); 531 key->tp.src = udp->source; 532 key->tp.dst = udp->dest; 533 } else { 534 memset(&key->tp, 0, sizeof(key->tp)); 535 } 536 } else if (key->ip.proto == IPPROTO_SCTP) { 537 if (sctphdr_ok(skb)) { 538 struct sctphdr *sctp = sctp_hdr(skb); 539 key->tp.src = sctp->source; 540 key->tp.dst = sctp->dest; 541 } else { 542 memset(&key->tp, 0, sizeof(key->tp)); 543 } 544 } else if (key->ip.proto == IPPROTO_ICMP) { 545 if (icmphdr_ok(skb)) { 546 struct icmphdr *icmp = icmp_hdr(skb); 547 /* The ICMP type and code fields use the 16-bit 548 * transport port fields, so we need to store 549 * them in 16-bit network byte order. */ 550 key->tp.src = htons(icmp->type); 551 key->tp.dst = htons(icmp->code); 552 } else { 553 memset(&key->tp, 0, sizeof(key->tp)); 554 } 555 } 556 557 } else if (key->eth.type == htons(ETH_P_ARP) || 558 key->eth.type == htons(ETH_P_RARP)) { 559 struct arp_eth_header *arp; 560 561 arp = (struct arp_eth_header *)skb_network_header(skb); 562 563 if (arphdr_ok(skb) && 564 arp->ar_hrd == htons(ARPHRD_ETHER) && 565 arp->ar_pro == htons(ETH_P_IP) && 566 arp->ar_hln == ETH_ALEN && 567 arp->ar_pln == 4) { 568 569 /* We only match on the lower 8 bits of the opcode. */ 570 if (ntohs(arp->ar_op) <= 0xff) 571 key->ip.proto = ntohs(arp->ar_op); 572 else 573 key->ip.proto = 0; 574 575 memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src)); 576 memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst)); 577 ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha); 578 ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha); 579 } else { 580 memset(&key->ip, 0, sizeof(key->ip)); 581 memset(&key->ipv4, 0, sizeof(key->ipv4)); 582 } 583 } else if (key->eth.type == htons(ETH_P_IPV6)) { 584 int nh_len; /* IPv6 Header + Extensions */ 585 586 nh_len = parse_ipv6hdr(skb, key); 587 if (unlikely(nh_len < 0)) { 588 memset(&key->ip, 0, sizeof(key->ip)); 589 memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr)); 590 if (nh_len == -EINVAL) { 591 skb->transport_header = skb->network_header; 592 error = 0; 593 } else { 594 error = nh_len; 595 } 596 return error; 597 } 598 599 if (key->ip.frag == OVS_FRAG_TYPE_LATER) 600 return 0; 601 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) 602 key->ip.frag = OVS_FRAG_TYPE_FIRST; 603 604 /* Transport layer. */ 605 if (key->ip.proto == NEXTHDR_TCP) { 606 if (tcphdr_ok(skb)) { 607 struct tcphdr *tcp = tcp_hdr(skb); 608 key->tp.src = tcp->source; 609 key->tp.dst = tcp->dest; 610 key->tp.flags = TCP_FLAGS_BE16(tcp); 611 } else { 612 memset(&key->tp, 0, sizeof(key->tp)); 613 } 614 } else if (key->ip.proto == NEXTHDR_UDP) { 615 if (udphdr_ok(skb)) { 616 struct udphdr *udp = udp_hdr(skb); 617 key->tp.src = udp->source; 618 key->tp.dst = udp->dest; 619 } else { 620 memset(&key->tp, 0, sizeof(key->tp)); 621 } 622 } else if (key->ip.proto == NEXTHDR_SCTP) { 623 if (sctphdr_ok(skb)) { 624 struct sctphdr *sctp = sctp_hdr(skb); 625 key->tp.src = sctp->source; 626 key->tp.dst = sctp->dest; 627 } else { 628 memset(&key->tp, 0, sizeof(key->tp)); 629 } 630 } else if (key->ip.proto == NEXTHDR_ICMP) { 631 if (icmp6hdr_ok(skb)) { 632 error = parse_icmpv6(skb, key, nh_len); 633 if (error) 634 return error; 635 } else { 636 memset(&key->tp, 0, sizeof(key->tp)); 637 } 638 } 639 } 640 return 0; 641 } 642 643 int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key) 644 { 645 return key_extract(skb, key); 646 } 647 648 int ovs_flow_key_extract(struct ovs_tunnel_info *tun_info, 649 struct sk_buff *skb, struct sw_flow_key *key) 650 { 651 /* Extract metadata from packet. */ 652 if (tun_info) { 653 memcpy(&key->tun_key, &tun_info->tunnel, sizeof(key->tun_key)); 654 655 if (tun_info->options) { 656 BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) * 657 8)) - 1 658 > sizeof(key->tun_opts)); 659 memcpy(GENEVE_OPTS(key, tun_info->options_len), 660 tun_info->options, tun_info->options_len); 661 key->tun_opts_len = tun_info->options_len; 662 } else { 663 key->tun_opts_len = 0; 664 } 665 } else { 666 key->tun_opts_len = 0; 667 memset(&key->tun_key, 0, sizeof(key->tun_key)); 668 } 669 670 key->phy.priority = skb->priority; 671 key->phy.in_port = OVS_CB(skb)->input_vport->port_no; 672 key->phy.skb_mark = skb->mark; 673 key->ovs_flow_hash = 0; 674 key->recirc_id = 0; 675 676 /* Flags are always used as part of stats */ 677 key->tp.flags = 0; 678 679 return key_extract(skb, key); 680 } 681 682 int ovs_flow_key_extract_userspace(const struct nlattr *attr, 683 struct sk_buff *skb, 684 struct sw_flow_key *key) 685 { 686 int err; 687 688 /* Extract metadata from netlink attributes. */ 689 err = ovs_nla_get_flow_metadata(attr, key); 690 if (err) 691 return err; 692 693 return key_extract(skb, key); 694 } 695