net/openvswitch/flow.c

   1 /*
   2  * Copyright (c) 2007-2011 Nicira, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #include "flow.h"
  20 #include "datapath.h"
  21 #include <linux/uaccess.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/etherdevice.h>
  24 #include <linux/if_ether.h>
  25 #include <linux/if_vlan.h>
  26 #include <net/llc_pdu.h>
  27 #include <linux/kernel.h>
  28 #include <linux/jhash.h>
  29 #include <linux/jiffies.h>
  30 #include <linux/llc.h>
  31 #include <linux/module.h>
  32 #include <linux/in.h>
  33 #include <linux/rcupdate.h>
  34 #include <linux/if_arp.h>
  35 #include <linux/ip.h>
  36 #include <linux/ipv6.h>
  37 #include <linux/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 static struct kmem_cache *flow_cache;
  47
  48 static int check_header(struct sk_buff *skb, int len)
  49 {
  50         if (unlikely(skb->len < len))
  51                 return -EINVAL;
  52         if (unlikely(!pskb_may_pull(skb, len)))
  53                 return -ENOMEM;
  54         return 0;
  55 }
  56
  57 static bool arphdr_ok(struct sk_buff *skb)
  58 {
  59         return pskb_may_pull(skb, skb_network_offset(skb) +
  60                                   sizeof(struct arp_eth_header));
  61 }
  62
  63 static int check_iphdr(struct sk_buff *skb)
  64 {
  65         unsigned int nh_ofs = skb_network_offset(skb);
  66         unsigned int ip_len;
  67         int err;
  68
  69         err = check_header(skb, nh_ofs + sizeof(struct iphdr));
  70         if (unlikely(err))
  71                 return err;
  72
  73         ip_len = ip_hdrlen(skb);
  74         if (unlikely(ip_len < sizeof(struct iphdr) ||
  75                      skb->len < nh_ofs + ip_len))
  76                 return -EINVAL;
  77
  78         skb_set_transport_header(skb, nh_ofs + ip_len);
  79         return 0;
  80 }
  81
  82 static bool tcphdr_ok(struct sk_buff *skb)
  83 {
  84         int th_ofs = skb_transport_offset(skb);
  85         int tcp_len;
  86
  87         if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
  88                 return false;
  89
  90         tcp_len = tcp_hdrlen(skb);
  91         if (unlikely(tcp_len < sizeof(struct tcphdr) ||
  92                      skb->len < th_ofs + tcp_len))
  93                 return false;
  94
  95         return true;
  96 }
  97
  98 static bool udphdr_ok(struct sk_buff *skb)
  99 {
 100         return pskb_may_pull(skb, skb_transport_offset(skb) +
 101                                   sizeof(struct udphdr));
 102 }
 103
 104 static bool icmphdr_ok(struct sk_buff *skb)
 105 {
 106         return pskb_may_pull(skb, skb_transport_offset(skb) +
 107                                   sizeof(struct icmphdr));
 108 }
 109
 110 u64 ovs_flow_used_time(unsigned long flow_jiffies)
 111 {
 112         struct timespec cur_ts;
 113         u64 cur_ms, idle_ms;
 114
 115         ktime_get_ts(&cur_ts);
 116         idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
 117         cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
 118                  cur_ts.tv_nsec / NSEC_PER_MSEC;
 119
 120         return cur_ms - idle_ms;
 121 }
 122
 123 #define SW_FLOW_KEY_OFFSET(field)               \
 124         (offsetof(struct sw_flow_key, field) +  \
 125          FIELD_SIZEOF(struct sw_flow_key, field))
 126
 127 static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key,
 128                          int *key_lenp)
 129 {
 130         unsigned int nh_ofs = skb_network_offset(skb);
 131         unsigned int nh_len;
 132         int payload_ofs;
 133         struct ipv6hdr *nh;
 134         uint8_t nexthdr;
 135         __be16 frag_off;
 136         int err;
 137
 138         *key_lenp = SW_FLOW_KEY_OFFSET(ipv6.label);
 139
 140         err = check_header(skb, nh_ofs + sizeof(*nh));
 141         if (unlikely(err))
 142                 return err;
 143
 144         nh = ipv6_hdr(skb);
 145         nexthdr = nh->nexthdr;
 146         payload_ofs = (u8 *)(nh + 1) - skb->data;
 147
 148         key->ip.proto = NEXTHDR_NONE;
 149         key->ip.tos = ipv6_get_dsfield(nh);
 150         key->ip.ttl = nh->hop_limit;
 151         key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
 152         key->ipv6.addr.src = nh->saddr;
 153         key->ipv6.addr.dst = nh->daddr;
 154
 155         payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
 156         if (unlikely(payload_ofs < 0))
 157                 return -EINVAL;
 158
 159         if (frag_off) {
 160                 if (frag_off & htons(~0x7))
 161                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 162                 else
 163                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 164         }
 165
 166         nh_len = payload_ofs - nh_ofs;
 167         skb_set_transport_header(skb, nh_ofs + nh_len);
 168         key->ip.proto = nexthdr;
 169         return nh_len;
 170 }
 171
 172 static bool icmp6hdr_ok(struct sk_buff *skb)
 173 {
 174         return pskb_may_pull(skb, skb_transport_offset(skb) +
 175                                   sizeof(struct icmp6hdr));
 176 }
 177
 178 #define TCP_FLAGS_OFFSET 13
 179 #define TCP_FLAG_MASK 0x3f
 180
 181 void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb)
 182 {
 183         u8 tcp_flags = 0;
 184
 185         if ((flow->key.eth.type == htons(ETH_P_IP) ||
 186              flow->key.eth.type == htons(ETH_P_IPV6)) &&
 187             flow->key.ip.proto == IPPROTO_TCP &&
 188             likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) {
 189                 u8 *tcp = (u8 *)tcp_hdr(skb);
 190                 tcp_flags = *(tcp + TCP_FLAGS_OFFSET) & TCP_FLAG_MASK;
 191         }
 192
 193         spin_lock(&flow->lock);
 194         flow->used = jiffies;
 195         flow->packet_count++;
 196         flow->byte_count += skb->len;
 197         flow->tcp_flags |= tcp_flags;
 198         spin_unlock(&flow->lock);
 199 }
 200
 201 struct sw_flow_actions *ovs_flow_actions_alloc(const struct nlattr *actions)
 202 {
 203         int actions_len = nla_len(actions);
 204         struct sw_flow_actions *sfa;
 205
 206         if (actions_len > MAX_ACTIONS_BUFSIZE)
 207                 return ERR_PTR(-EINVAL);
 208
 209         sfa = kmalloc(sizeof(*sfa) + actions_len, GFP_KERNEL);
 210         if (!sfa)
 211                 return ERR_PTR(-ENOMEM);
 212
 213         sfa->actions_len = actions_len;
 214         memcpy(sfa->actions, nla_data(actions), actions_len);
 215         return sfa;
 216 }
 217
 218 struct sw_flow *ovs_flow_alloc(void)
 219 {
 220         struct sw_flow *flow;
 221
 222         flow = kmem_cache_alloc(flow_cache, GFP_KERNEL);
 223         if (!flow)
 224                 return ERR_PTR(-ENOMEM);
 225
 226         spin_lock_init(&flow->lock);
 227         flow->sf_acts = NULL;
 228
 229         return flow;
 230 }
 231
 232 static struct hlist_head *find_bucket(struct flow_table *table, u32 hash)
 233 {
 234         hash = jhash_1word(hash, table->hash_seed);
 235         return flex_array_get(table->buckets,
 236                                 (hash & (table->n_buckets - 1)));
 237 }
 238
 239 static struct flex_array *alloc_buckets(unsigned int n_buckets)
 240 {
 241         struct flex_array *buckets;
 242         int i, err;
 243
 244         buckets = flex_array_alloc(sizeof(struct hlist_head *),
 245                                    n_buckets, GFP_KERNEL);
 246         if (!buckets)
 247                 return NULL;
 248
 249         err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL);
 250         if (err) {
 251                 flex_array_free(buckets);
 252                 return NULL;
 253         }
 254
 255         for (i = 0; i < n_buckets; i++)
 256                 INIT_HLIST_HEAD((struct hlist_head *)
 257                                         flex_array_get(buckets, i));
 258
 259         return buckets;
 260 }
 261
 262 static void free_buckets(struct flex_array *buckets)
 263 {
 264         flex_array_free(buckets);
 265 }
 266
 267 struct flow_table *ovs_flow_tbl_alloc(int new_size)
 268 {
 269         struct flow_table *table = kmalloc(sizeof(*table), GFP_KERNEL);
 270
 271         if (!table)
 272                 return NULL;
 273
 274         table->buckets = alloc_buckets(new_size);
 275
 276         if (!table->buckets) {
 277                 kfree(table);
 278                 return NULL;
 279         }
 280         table->n_buckets = new_size;
 281         table->count = 0;
 282         table->node_ver = 0;
 283         table->keep_flows = false;
 284         get_random_bytes(&table->hash_seed, sizeof(u32));
 285
 286         return table;
 287 }
 288
 289 void ovs_flow_tbl_destroy(struct flow_table *table)
 290 {
 291         int i;
 292
 293         if (!table)
 294                 return;
 295
 296         if (table->keep_flows)
 297                 goto skip_flows;
 298
 299         for (i = 0; i < table->n_buckets; i++) {
 300                 struct sw_flow *flow;
 301                 struct hlist_head *head = flex_array_get(table->buckets, i);
 302                 struct hlist_node *n;
 303                 int ver = table->node_ver;
 304
 305                 hlist_for_each_entry_safe(flow, n, head, hash_node[ver]) {
 306                         hlist_del_rcu(&flow->hash_node[ver]);
 307                         ovs_flow_free(flow);
 308                 }
 309         }
 310
 311 skip_flows:
 312         free_buckets(table->buckets);
 313         kfree(table);
 314 }
 315
 316 static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu)
 317 {
 318         struct flow_table *table = container_of(rcu, struct flow_table, rcu);
 319
 320         ovs_flow_tbl_destroy(table);
 321 }
 322
 323 void ovs_flow_tbl_deferred_destroy(struct flow_table *table)
 324 {
 325         if (!table)
 326                 return;
 327
 328         call_rcu(&table->rcu, flow_tbl_destroy_rcu_cb);
 329 }
 330
 331 struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *last)
 332 {
 333         struct sw_flow *flow;
 334         struct hlist_head *head;
 335         int ver;
 336         int i;
 337
 338         ver = table->node_ver;
 339         while (*bucket < table->n_buckets) {
 340                 i = 0;
 341                 head = flex_array_get(table->buckets, *bucket);
 342                 hlist_for_each_entry_rcu(flow, head, hash_node[ver]) {
 343                         if (i < *last) {
 344                                 i++;
 345                                 continue;
 346                         }
 347                         *last = i + 1;
 348                         return flow;
 349                 }
 350                 (*bucket)++;
 351                 *last = 0;
 352         }
 353
 354         return NULL;
 355 }
 356
 357 static void flow_table_copy_flows(struct flow_table *old, struct flow_table *new)
 358 {
 359         int old_ver;
 360         int i;
 361
 362         old_ver = old->node_ver;
 363         new->node_ver = !old_ver;
 364
 365         /* Insert in new table. */
 366         for (i = 0; i < old->n_buckets; i++) {
 367                 struct sw_flow *flow;
 368                 struct hlist_head *head;
 369
 370                 head = flex_array_get(old->buckets, i);
 371
 372                 hlist_for_each_entry(flow, head, hash_node[old_ver])
 373                         ovs_flow_tbl_insert(new, flow);
 374         }
 375         old->keep_flows = true;
 376 }
 377
 378 static struct flow_table *__flow_tbl_rehash(struct flow_table *table, int n_buckets)
 379 {
 380         struct flow_table *new_table;
 381
 382         new_table = ovs_flow_tbl_alloc(n_buckets);
 383         if (!new_table)
 384                 return ERR_PTR(-ENOMEM);
 385
 386         flow_table_copy_flows(table, new_table);
 387
 388         return new_table;
 389 }
 390
 391 struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table)
 392 {
 393         return __flow_tbl_rehash(table, table->n_buckets);
 394 }
 395
 396 struct flow_table *ovs_flow_tbl_expand(struct flow_table *table)
 397 {
 398         return __flow_tbl_rehash(table, table->n_buckets * 2);
 399 }
 400
 401 void ovs_flow_free(struct sw_flow *flow)
 402 {
 403         if (unlikely(!flow))
 404                 return;
 405
 406         kfree((struct sf_flow_acts __force *)flow->sf_acts);
 407         kmem_cache_free(flow_cache, flow);
 408 }
 409
 410 /* RCU callback used by ovs_flow_deferred_free. */
 411 static void rcu_free_flow_callback(struct rcu_head *rcu)
 412 {
 413         struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu);
 414
 415         ovs_flow_free(flow);
 416 }
 417
 418 /* Schedules 'flow' to be freed after the next RCU grace period.
 419  * The caller must hold rcu_read_lock for this to be sensible. */
 420 void ovs_flow_deferred_free(struct sw_flow *flow)
 421 {
 422         call_rcu(&flow->rcu, rcu_free_flow_callback);
 423 }
 424
 425 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
 426  * The caller must hold rcu_read_lock for this to be sensible. */
 427 void ovs_flow_deferred_free_acts(struct sw_flow_actions *sf_acts)
 428 {
 429         kfree_rcu(sf_acts, rcu);
 430 }
 431
 432 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
 433 {
 434         struct qtag_prefix {
 435                 __be16 eth_type; /* ETH_P_8021Q */
 436                 __be16 tci;
 437         };
 438         struct qtag_prefix *qp;
 439
 440         if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
 441                 return 0;
 442
 443         if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
 444                                          sizeof(__be16))))
 445                 return -ENOMEM;
 446
 447         qp = (struct qtag_prefix *) skb->data;
 448         key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
 449         __skb_pull(skb, sizeof(struct qtag_prefix));
 450
 451         return 0;
 452 }
 453
 454 static __be16 parse_ethertype(struct sk_buff *skb)
 455 {
 456         struct llc_snap_hdr {
 457                 u8  dsap;  /* Always 0xAA */
 458                 u8  ssap;  /* Always 0xAA */
 459                 u8  ctrl;
 460                 u8  oui[3];
 461                 __be16 ethertype;
 462         };
 463         struct llc_snap_hdr *llc;
 464         __be16 proto;
 465
 466         proto = *(__be16 *) skb->data;
 467         __skb_pull(skb, sizeof(__be16));
 468
 469         if (ntohs(proto) >= 1536)
 470                 return proto;
 471
 472         if (skb->len < sizeof(struct llc_snap_hdr))
 473                 return htons(ETH_P_802_2);
 474
 475         if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
 476                 return htons(0);
 477
 478         llc = (struct llc_snap_hdr *) skb->data;
 479         if (llc->dsap != LLC_SAP_SNAP ||
 480             llc->ssap != LLC_SAP_SNAP ||
 481             (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
 482                 return htons(ETH_P_802_2);
 483
 484         __skb_pull(skb, sizeof(struct llc_snap_hdr));
 485         return llc->ethertype;
 486 }
 487
 488 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
 489                         int *key_lenp, int nh_len)
 490 {
 491         struct icmp6hdr *icmp = icmp6_hdr(skb);
 492         int error = 0;
 493         int key_len;
 494
 495         /* The ICMPv6 type and code fields use the 16-bit transport port
 496          * fields, so we need to store them in 16-bit network byte order.
 497          */
 498         key->ipv6.tp.src = htons(icmp->icmp6_type);
 499         key->ipv6.tp.dst = htons(icmp->icmp6_code);
 500         key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 501
 502         if (icmp->icmp6_code == 0 &&
 503             (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
 504              icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 505                 int icmp_len = skb->len - skb_transport_offset(skb);
 506                 struct nd_msg *nd;
 507                 int offset;
 508
 509                 key_len = SW_FLOW_KEY_OFFSET(ipv6.nd);
 510
 511                 /* In order to process neighbor discovery options, we need the
 512                  * entire packet.
 513                  */
 514                 if (unlikely(icmp_len < sizeof(*nd)))
 515                         goto out;
 516                 if (unlikely(skb_linearize(skb))) {
 517                         error = -ENOMEM;
 518                         goto out;
 519                 }
 520
 521                 nd = (struct nd_msg *)skb_transport_header(skb);
 522                 key->ipv6.nd.target = nd->target;
 523                 key_len = SW_FLOW_KEY_OFFSET(ipv6.nd);
 524
 525                 icmp_len -= sizeof(*nd);
 526                 offset = 0;
 527                 while (icmp_len >= 8) {
 528                         struct nd_opt_hdr *nd_opt =
 529                                  (struct nd_opt_hdr *)(nd->opt + offset);
 530                         int opt_len = nd_opt->nd_opt_len * 8;
 531
 532                         if (unlikely(!opt_len || opt_len > icmp_len))
 533                                 goto invalid;
 534
 535                         /* Store the link layer address if the appropriate
 536                          * option is provided.  It is considered an error if
 537                          * the same link layer option is specified twice.
 538                          */
 539                         if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
 540                             && opt_len == 8) {
 541                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
 542                                         goto invalid;
 543                                 memcpy(key->ipv6.nd.sll,
 544                                     &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
 545                         } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
 546                                    && opt_len == 8) {
 547                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
 548                                         goto invalid;
 549                                 memcpy(key->ipv6.nd.tll,
 550                                     &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
 551                         }
 552
 553                         icmp_len -= opt_len;
 554                         offset += opt_len;
 555                 }
 556         }
 557
 558         goto out;
 559
 560 invalid:
 561         memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
 562         memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
 563         memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
 564
 565 out:
 566         *key_lenp = key_len;
 567         return error;
 568 }
 569
 570 /**
 571  * ovs_flow_extract - extracts a flow key from an Ethernet frame.
 572  * @skb: sk_buff that contains the frame, with skb->data pointing to the
 573  * Ethernet header
 574  * @in_port: port number on which @skb was received.
 575  * @key: output flow key
 576  * @key_lenp: length of output flow key
 577  *
 578  * The caller must ensure that skb->len >= ETH_HLEN.
 579  *
 580  * Returns 0 if successful, otherwise a negative errno value.
 581  *
 582  * Initializes @skb header pointers as follows:
 583  *
 584  *    - skb->mac_header: the Ethernet header.
 585  *
 586  *    - skb->network_header: just past the Ethernet header, or just past the
 587  *      VLAN header, to the first byte of the Ethernet payload.
 588  *
 589  *    - skb->transport_header: If key->dl_type is ETH_P_IP or ETH_P_IPV6
 590  *      on output, then just past the IP header, if one is present and
 591  *      of a correct length, otherwise the same as skb->network_header.
 592  *      For other key->dl_type values it is left untouched.
 593  */
 594 int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key,
 595                  int *key_lenp)
 596 {
 597         int error = 0;
 598         int key_len = SW_FLOW_KEY_OFFSET(eth);
 599         struct ethhdr *eth;
 600
 601         memset(key, 0, sizeof(*key));
 602
 603         key->phy.priority = skb->priority;
 604         key->phy.in_port = in_port;
 605         key->phy.skb_mark = skb->mark;
 606
 607         skb_reset_mac_header(skb);
 608
 609         /* Link layer.  We are guaranteed to have at least the 14 byte Ethernet
 610          * header in the linear data area.
 611          */
 612         eth = eth_hdr(skb);
 613         memcpy(key->eth.src, eth->h_source, ETH_ALEN);
 614         memcpy(key->eth.dst, eth->h_dest, ETH_ALEN);
 615
 616         __skb_pull(skb, 2 * ETH_ALEN);
 617
 618         if (vlan_tx_tag_present(skb))
 619                 key->eth.tci = htons(skb->vlan_tci);
 620         else if (eth->h_proto == htons(ETH_P_8021Q))
 621                 if (unlikely(parse_vlan(skb, key)))
 622                         return -ENOMEM;
 623
 624         key->eth.type = parse_ethertype(skb);
 625         if (unlikely(key->eth.type == htons(0)))
 626                 return -ENOMEM;
 627
 628         skb_reset_network_header(skb);
 629         __skb_push(skb, skb->data - skb_mac_header(skb));
 630
 631         /* Network layer. */
 632         if (key->eth.type == htons(ETH_P_IP)) {
 633                 struct iphdr *nh;
 634                 __be16 offset;
 635
 636                 key_len = SW_FLOW_KEY_OFFSET(ipv4.addr);
 637
 638                 error = check_iphdr(skb);
 639                 if (unlikely(error)) {
 640                         if (error == -EINVAL) {
 641                                 skb->transport_header = skb->network_header;
 642                                 error = 0;
 643                         }
 644                         goto out;
 645                 }
 646
 647                 nh = ip_hdr(skb);
 648                 key->ipv4.addr.src = nh->saddr;
 649                 key->ipv4.addr.dst = nh->daddr;
 650
 651                 key->ip.proto = nh->protocol;
 652                 key->ip.tos = nh->tos;
 653                 key->ip.ttl = nh->ttl;
 654
 655                 offset = nh->frag_off & htons(IP_OFFSET);
 656                 if (offset) {
 657                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 658                         goto out;
 659                 }
 660                 if (nh->frag_off & htons(IP_MF) ||
 661                          skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 662                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 663
 664                 /* Transport layer. */
 665                 if (key->ip.proto == IPPROTO_TCP) {
 666                         key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
 667                         if (tcphdr_ok(skb)) {
 668                                 struct tcphdr *tcp = tcp_hdr(skb);
 669                                 key->ipv4.tp.src = tcp->source;
 670                                 key->ipv4.tp.dst = tcp->dest;
 671                         }
 672                 } else if (key->ip.proto == IPPROTO_UDP) {
 673                         key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
 674                         if (udphdr_ok(skb)) {
 675                                 struct udphdr *udp = udp_hdr(skb);
 676                                 key->ipv4.tp.src = udp->source;
 677                                 key->ipv4.tp.dst = udp->dest;
 678                         }
 679                 } else if (key->ip.proto == IPPROTO_ICMP) {
 680                         key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
 681                         if (icmphdr_ok(skb)) {
 682                                 struct icmphdr *icmp = icmp_hdr(skb);
 683                                 /* The ICMP type and code fields use the 16-bit
 684                                  * transport port fields, so we need to store
 685                                  * them in 16-bit network byte order. */
 686                                 key->ipv4.tp.src = htons(icmp->type);
 687                                 key->ipv4.tp.dst = htons(icmp->code);
 688                         }
 689                 }
 690
 691         } else if ((key->eth.type == htons(ETH_P_ARP) ||
 692                    key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) {
 693                 struct arp_eth_header *arp;
 694
 695                 arp = (struct arp_eth_header *)skb_network_header(skb);
 696
 697                 if (arp->ar_hrd == htons(ARPHRD_ETHER)
 698                                 && arp->ar_pro == htons(ETH_P_IP)
 699                                 && arp->ar_hln == ETH_ALEN
 700                                 && arp->ar_pln == 4) {
 701
 702                         /* We only match on the lower 8 bits of the opcode. */
 703                         if (ntohs(arp->ar_op) <= 0xff)
 704                                 key->ip.proto = ntohs(arp->ar_op);
 705                         memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
 706                         memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
 707                         memcpy(key->ipv4.arp.sha, arp->ar_sha, ETH_ALEN);
 708                         memcpy(key->ipv4.arp.tha, arp->ar_tha, ETH_ALEN);
 709                         key_len = SW_FLOW_KEY_OFFSET(ipv4.arp);
 710                 }
 711         } else if (key->eth.type == htons(ETH_P_IPV6)) {
 712                 int nh_len;             /* IPv6 Header + Extensions */
 713
 714                 nh_len = parse_ipv6hdr(skb, key, &key_len);
 715                 if (unlikely(nh_len < 0)) {
 716                         if (nh_len == -EINVAL)
 717                                 skb->transport_header = skb->network_header;
 718                         else
 719                                 error = nh_len;
 720                         goto out;
 721                 }
 722
 723                 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
 724                         goto out;
 725                 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 726                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 727
 728                 /* Transport layer. */
 729                 if (key->ip.proto == NEXTHDR_TCP) {
 730                         key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 731                         if (tcphdr_ok(skb)) {
 732                                 struct tcphdr *tcp = tcp_hdr(skb);
 733                                 key->ipv6.tp.src = tcp->source;
 734                                 key->ipv6.tp.dst = tcp->dest;
 735                         }
 736                 } else if (key->ip.proto == NEXTHDR_UDP) {
 737                         key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 738                         if (udphdr_ok(skb)) {
 739                                 struct udphdr *udp = udp_hdr(skb);
 740                                 key->ipv6.tp.src = udp->source;
 741                                 key->ipv6.tp.dst = udp->dest;
 742                         }
 743                 } else if (key->ip.proto == NEXTHDR_ICMP) {
 744                         key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 745                         if (icmp6hdr_ok(skb)) {
 746                                 error = parse_icmpv6(skb, key, &key_len, nh_len);
 747                                 if (error < 0)
 748                                         goto out;
 749                         }
 750                 }
 751         }
 752
 753 out:
 754         *key_lenp = key_len;
 755         return error;
 756 }
 757
 758 u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len)
 759 {
 760         return jhash2((u32 *)key, DIV_ROUND_UP(key_len, sizeof(u32)), 0);
 761 }
 762
 763 struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table,
 764                                 struct sw_flow_key *key, int key_len)
 765 {
 766         struct sw_flow *flow;
 767         struct hlist_head *head;
 768         u32 hash;
 769
 770         hash = ovs_flow_hash(key, key_len);
 771
 772         head = find_bucket(table, hash);
 773         hlist_for_each_entry_rcu(flow, head, hash_node[table->node_ver]) {
 774
 775                 if (flow->hash == hash &&
 776                     !memcmp(&flow->key, key, key_len)) {
 777                         return flow;
 778                 }
 779         }
 780         return NULL;
 781 }
 782
 783 void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow)
 784 {
 785         struct hlist_head *head;
 786
 787         head = find_bucket(table, flow->hash);
 788         hlist_add_head_rcu(&flow->hash_node[table->node_ver], head);
 789         table->count++;
 790 }
 791
 792 void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow)
 793 {
 794         hlist_del_rcu(&flow->hash_node[table->node_ver]);
 795         table->count--;
 796         BUG_ON(table->count < 0);
 797 }
 798
 799 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
 800 const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
 801         [OVS_KEY_ATTR_ENCAP] = -1,
 802         [OVS_KEY_ATTR_PRIORITY] = sizeof(u32),
 803         [OVS_KEY_ATTR_IN_PORT] = sizeof(u32),
 804         [OVS_KEY_ATTR_SKB_MARK] = sizeof(u32),
 805         [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet),
 806         [OVS_KEY_ATTR_VLAN] = sizeof(__be16),
 807         [OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16),
 808         [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
 809         [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
 810         [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
 811         [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
 812         [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
 813         [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
 814         [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
 815         [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
 816 };
 817
 818 static int ipv4_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_len,
 819                                   const struct nlattr *a[], u32 *attrs)
 820 {
 821         const struct ovs_key_icmp *icmp_key;
 822         const struct ovs_key_tcp *tcp_key;
 823         const struct ovs_key_udp *udp_key;
 824
 825         switch (swkey->ip.proto) {
 826         case IPPROTO_TCP:
 827                 if (!(*attrs & (1 << OVS_KEY_ATTR_TCP)))
 828                         return -EINVAL;
 829                 *attrs &= ~(1 << OVS_KEY_ATTR_TCP);
 830
 831                 *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
 832                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
 833                 swkey->ipv4.tp.src = tcp_key->tcp_src;
 834                 swkey->ipv4.tp.dst = tcp_key->tcp_dst;
 835                 break;
 836
 837         case IPPROTO_UDP:
 838                 if (!(*attrs & (1 << OVS_KEY_ATTR_UDP)))
 839                         return -EINVAL;
 840                 *attrs &= ~(1 << OVS_KEY_ATTR_UDP);
 841
 842                 *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
 843                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
 844                 swkey->ipv4.tp.src = udp_key->udp_src;
 845                 swkey->ipv4.tp.dst = udp_key->udp_dst;
 846                 break;
 847
 848         case IPPROTO_ICMP:
 849                 if (!(*attrs & (1 << OVS_KEY_ATTR_ICMP)))
 850                         return -EINVAL;
 851                 *attrs &= ~(1 << OVS_KEY_ATTR_ICMP);
 852
 853                 *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
 854                 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
 855                 swkey->ipv4.tp.src = htons(icmp_key->icmp_type);
 856                 swkey->ipv4.tp.dst = htons(icmp_key->icmp_code);
 857                 break;
 858         }
 859
 860         return 0;
 861 }
 862
 863 static int ipv6_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_len,
 864                                   const struct nlattr *a[], u32 *attrs)
 865 {
 866         const struct ovs_key_icmpv6 *icmpv6_key;
 867         const struct ovs_key_tcp *tcp_key;
 868         const struct ovs_key_udp *udp_key;
 869
 870         switch (swkey->ip.proto) {
 871         case IPPROTO_TCP:
 872                 if (!(*attrs & (1 << OVS_KEY_ATTR_TCP)))
 873                         return -EINVAL;
 874                 *attrs &= ~(1 << OVS_KEY_ATTR_TCP);
 875
 876                 *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 877                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
 878                 swkey->ipv6.tp.src = tcp_key->tcp_src;
 879                 swkey->ipv6.tp.dst = tcp_key->tcp_dst;
 880                 break;
 881
 882         case IPPROTO_UDP:
 883                 if (!(*attrs & (1 << OVS_KEY_ATTR_UDP)))
 884                         return -EINVAL;
 885                 *attrs &= ~(1 << OVS_KEY_ATTR_UDP);
 886
 887                 *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 888                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
 889                 swkey->ipv6.tp.src = udp_key->udp_src;
 890                 swkey->ipv6.tp.dst = udp_key->udp_dst;
 891                 break;
 892
 893         case IPPROTO_ICMPV6:
 894                 if (!(*attrs & (1 << OVS_KEY_ATTR_ICMPV6)))
 895                         return -EINVAL;
 896                 *attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6);
 897
 898                 *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 899                 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
 900                 swkey->ipv6.tp.src = htons(icmpv6_key->icmpv6_type);
 901                 swkey->ipv6.tp.dst = htons(icmpv6_key->icmpv6_code);
 902
 903                 if (swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 904                     swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 905                         const struct ovs_key_nd *nd_key;
 906
 907                         if (!(*attrs & (1 << OVS_KEY_ATTR_ND)))
 908                                 return -EINVAL;
 909                         *attrs &= ~(1 << OVS_KEY_ATTR_ND);
 910
 911                         *key_len = SW_FLOW_KEY_OFFSET(ipv6.nd);
 912                         nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
 913                         memcpy(&swkey->ipv6.nd.target, nd_key->nd_target,
 914                                sizeof(swkey->ipv6.nd.target));
 915                         memcpy(swkey->ipv6.nd.sll, nd_key->nd_sll, ETH_ALEN);
 916                         memcpy(swkey->ipv6.nd.tll, nd_key->nd_tll, ETH_ALEN);
 917                 }
 918                 break;
 919         }
 920
 921         return 0;
 922 }
 923
 924 static int parse_flow_nlattrs(const struct nlattr *attr,
 925                               const struct nlattr *a[], u32 *attrsp)
 926 {
 927         const struct nlattr *nla;
 928         u32 attrs;
 929         int rem;
 930
 931         attrs = 0;
 932         nla_for_each_nested(nla, attr, rem) {
 933                 u16 type = nla_type(nla);
 934                 int expected_len;
 935
 936                 if (type > OVS_KEY_ATTR_MAX || attrs & (1 << type))
 937                         return -EINVAL;
 938
 939                 expected_len = ovs_key_lens[type];
 940                 if (nla_len(nla) != expected_len && expected_len != -1)
 941                         return -EINVAL;
 942
 943                 attrs |= 1 << type;
 944                 a[type] = nla;
 945         }
 946         if (rem)
 947                 return -EINVAL;
 948
 949         *attrsp = attrs;
 950         return 0;
 951 }
 952
 953 /**
 954  * ovs_flow_from_nlattrs - parses Netlink attributes into a flow key.
 955  * @swkey: receives the extracted flow key.
 956  * @key_lenp: number of bytes used in @swkey.
 957  * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
 958  * sequence.
 959  */
 960 int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
 961                       const struct nlattr *attr)
 962 {
 963         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
 964         const struct ovs_key_ethernet *eth_key;
 965         int key_len;
 966         u32 attrs;
 967         int err;
 968
 969         memset(swkey, 0, sizeof(struct sw_flow_key));
 970         key_len = SW_FLOW_KEY_OFFSET(eth);
 971
 972         err = parse_flow_nlattrs(attr, a, &attrs);
 973         if (err)
 974                 return err;
 975
 976         /* Metadata attributes. */
 977         if (attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
 978                 swkey->phy.priority = nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]);
 979                 attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY);
 980         }
 981         if (attrs & (1 << OVS_KEY_ATTR_IN_PORT)) {
 982                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
 983                 if (in_port >= DP_MAX_PORTS)
 984                         return -EINVAL;
 985                 swkey->phy.in_port = in_port;
 986                 attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT);
 987         } else {
 988                 swkey->phy.in_port = DP_MAX_PORTS;
 989         }
 990         if (attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) {
 991                 swkey->phy.skb_mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
 992                 attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK);
 993         }
 994
 995         /* Data attributes. */
 996         if (!(attrs & (1 << OVS_KEY_ATTR_ETHERNET)))
 997                 return -EINVAL;
 998         attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET);
 999
1000         eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
1001         memcpy(swkey->eth.src, eth_key->eth_src, ETH_ALEN);
1002         memcpy(swkey->eth.dst, eth_key->eth_dst, ETH_ALEN);
1003
1004         if (attrs & (1u << OVS_KEY_ATTR_ETHERTYPE) &&
1005             nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q)) {
1006                 const struct nlattr *encap;
1007                 __be16 tci;
1008
1009                 if (attrs != ((1 << OVS_KEY_ATTR_VLAN) |
1010                               (1 << OVS_KEY_ATTR_ETHERTYPE) |
1011                               (1 << OVS_KEY_ATTR_ENCAP)))
1012                         return -EINVAL;
1013
1014                 encap = a[OVS_KEY_ATTR_ENCAP];
1015                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1016                 if (tci & htons(VLAN_TAG_PRESENT)) {
1017                         swkey->eth.tci = tci;
1018
1019                         err = parse_flow_nlattrs(encap, a, &attrs);
1020                         if (err)
1021                                 return err;
1022                 } else if (!tci) {
1023                         /* Corner case for truncated 802.1Q header. */
1024                         if (nla_len(encap))
1025                                 return -EINVAL;
1026
1027                         swkey->eth.type = htons(ETH_P_8021Q);
1028                         *key_lenp = key_len;
1029                         return 0;
1030                 } else {
1031                         return -EINVAL;
1032                 }
1033         }
1034
1035         if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
1036                 swkey->eth.type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1037                 if (ntohs(swkey->eth.type) < 1536)
1038                         return -EINVAL;
1039                 attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
1040         } else {
1041                 swkey->eth.type = htons(ETH_P_802_2);
1042         }
1043
1044         if (swkey->eth.type == htons(ETH_P_IP)) {
1045                 const struct ovs_key_ipv4 *ipv4_key;
1046
1047                 if (!(attrs & (1 << OVS_KEY_ATTR_IPV4)))
1048                         return -EINVAL;
1049                 attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
1050
1051                 key_len = SW_FLOW_KEY_OFFSET(ipv4.addr);
1052                 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
1053                 if (ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX)
1054                         return -EINVAL;
1055                 swkey->ip.proto = ipv4_key->ipv4_proto;
1056                 swkey->ip.tos = ipv4_key->ipv4_tos;
1057                 swkey->ip.ttl = ipv4_key->ipv4_ttl;
1058                 swkey->ip.frag = ipv4_key->ipv4_frag;
1059                 swkey->ipv4.addr.src = ipv4_key->ipv4_src;
1060                 swkey->ipv4.addr.dst = ipv4_key->ipv4_dst;
1061
1062                 if (swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1063                         err = ipv4_flow_from_nlattrs(swkey, &key_len, a, &attrs);
1064                         if (err)
1065                                 return err;
1066                 }
1067         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1068                 const struct ovs_key_ipv6 *ipv6_key;
1069
1070                 if (!(attrs & (1 << OVS_KEY_ATTR_IPV6)))
1071                         return -EINVAL;
1072                 attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
1073
1074                 key_len = SW_FLOW_KEY_OFFSET(ipv6.label);
1075                 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
1076                 if (ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX)
1077                         return -EINVAL;
1078                 swkey->ipv6.label = ipv6_key->ipv6_label;
1079                 swkey->ip.proto = ipv6_key->ipv6_proto;
1080                 swkey->ip.tos = ipv6_key->ipv6_tclass;
1081                 swkey->ip.ttl = ipv6_key->ipv6_hlimit;
1082                 swkey->ip.frag = ipv6_key->ipv6_frag;
1083                 memcpy(&swkey->ipv6.addr.src, ipv6_key->ipv6_src,
1084                        sizeof(swkey->ipv6.addr.src));
1085                 memcpy(&swkey->ipv6.addr.dst, ipv6_key->ipv6_dst,
1086                        sizeof(swkey->ipv6.addr.dst));
1087
1088                 if (swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1089                         err = ipv6_flow_from_nlattrs(swkey, &key_len, a, &attrs);
1090                         if (err)
1091                                 return err;
1092                 }
1093         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
1094                    swkey->eth.type == htons(ETH_P_RARP)) {
1095                 const struct ovs_key_arp *arp_key;
1096
1097                 if (!(attrs & (1 << OVS_KEY_ATTR_ARP)))
1098                         return -EINVAL;
1099                 attrs &= ~(1 << OVS_KEY_ATTR_ARP);
1100
1101                 key_len = SW_FLOW_KEY_OFFSET(ipv4.arp);
1102                 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
1103                 swkey->ipv4.addr.src = arp_key->arp_sip;
1104                 swkey->ipv4.addr.dst = arp_key->arp_tip;
1105                 if (arp_key->arp_op & htons(0xff00))
1106                         return -EINVAL;
1107                 swkey->ip.proto = ntohs(arp_key->arp_op);
1108                 memcpy(swkey->ipv4.arp.sha, arp_key->arp_sha, ETH_ALEN);
1109                 memcpy(swkey->ipv4.arp.tha, arp_key->arp_tha, ETH_ALEN);
1110         }
1111
1112         if (attrs)
1113                 return -EINVAL;
1114         *key_lenp = key_len;
1115
1116         return 0;
1117 }
1118
1119 /**
1120  * ovs_flow_metadata_from_nlattrs - parses Netlink attributes into a flow key.
1121  * @priority: receives the skb priority
1122  * @mark: receives the skb mark
1123  * @in_port: receives the extracted input port.
1124  * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1125  * sequence.
1126  *
1127  * This parses a series of Netlink attributes that form a flow key, which must
1128  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
1129  * get the metadata, that is, the parts of the flow key that cannot be
1130  * extracted from the packet itself.
1131  */
1132 int ovs_flow_metadata_from_nlattrs(u32 *priority, u32 *mark, u16 *in_port,
1133                                const struct nlattr *attr)
1134 {
1135         const struct nlattr *nla;
1136         int rem;
1137
1138         *in_port = DP_MAX_PORTS;
1139         *priority = 0;
1140         *mark = 0;
1141
1142         nla_for_each_nested(nla, attr, rem) {
1143                 int type = nla_type(nla);
1144
1145                 if (type <= OVS_KEY_ATTR_MAX && ovs_key_lens[type] > 0) {
1146                         if (nla_len(nla) != ovs_key_lens[type])
1147                                 return -EINVAL;
1148
1149                         switch (type) {
1150                         case OVS_KEY_ATTR_PRIORITY:
1151                                 *priority = nla_get_u32(nla);
1152                                 break;
1153
1154                         case OVS_KEY_ATTR_IN_PORT:
1155                                 if (nla_get_u32(nla) >= DP_MAX_PORTS)
1156                                         return -EINVAL;
1157                                 *in_port = nla_get_u32(nla);
1158                                 break;
1159
1160                         case OVS_KEY_ATTR_SKB_MARK:
1161                                 *mark = nla_get_u32(nla);
1162                                 break;
1163                         }
1164                 }
1165         }
1166         if (rem)
1167                 return -EINVAL;
1168         return 0;
1169 }
1170
1171 int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb)
1172 {
1173         struct ovs_key_ethernet *eth_key;
1174         struct nlattr *nla, *encap;
1175
1176         if (swkey->phy.priority &&
1177             nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, swkey->phy.priority))
1178                 goto nla_put_failure;
1179
1180         if (swkey->phy.in_port != DP_MAX_PORTS &&
1181             nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, swkey->phy.in_port))
1182                 goto nla_put_failure;
1183
1184         if (swkey->phy.skb_mark &&
1185             nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, swkey->phy.skb_mark))
1186                 goto nla_put_failure;
1187
1188         nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
1189         if (!nla)
1190                 goto nla_put_failure;
1191         eth_key = nla_data(nla);
1192         memcpy(eth_key->eth_src, swkey->eth.src, ETH_ALEN);
1193         memcpy(eth_key->eth_dst, swkey->eth.dst, ETH_ALEN);
1194
1195         if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
1196                 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, htons(ETH_P_8021Q)) ||
1197                     nla_put_be16(skb, OVS_KEY_ATTR_VLAN, swkey->eth.tci))
1198                         goto nla_put_failure;
1199                 encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
1200                 if (!swkey->eth.tci)
1201                         goto unencap;
1202         } else {
1203                 encap = NULL;
1204         }
1205
1206         if (swkey->eth.type == htons(ETH_P_802_2))
1207                 goto unencap;
1208
1209         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, swkey->eth.type))
1210                 goto nla_put_failure;
1211
1212         if (swkey->eth.type == htons(ETH_P_IP)) {
1213                 struct ovs_key_ipv4 *ipv4_key;
1214
1215                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
1216                 if (!nla)
1217                         goto nla_put_failure;
1218                 ipv4_key = nla_data(nla);
1219                 ipv4_key->ipv4_src = swkey->ipv4.addr.src;
1220                 ipv4_key->ipv4_dst = swkey->ipv4.addr.dst;
1221                 ipv4_key->ipv4_proto = swkey->ip.proto;
1222                 ipv4_key->ipv4_tos = swkey->ip.tos;
1223                 ipv4_key->ipv4_ttl = swkey->ip.ttl;
1224                 ipv4_key->ipv4_frag = swkey->ip.frag;
1225         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1226                 struct ovs_key_ipv6 *ipv6_key;
1227
1228                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
1229                 if (!nla)
1230                         goto nla_put_failure;
1231                 ipv6_key = nla_data(nla);
1232                 memcpy(ipv6_key->ipv6_src, &swkey->ipv6.addr.src,
1233                                 sizeof(ipv6_key->ipv6_src));
1234                 memcpy(ipv6_key->ipv6_dst, &swkey->ipv6.addr.dst,
1235                                 sizeof(ipv6_key->ipv6_dst));
1236                 ipv6_key->ipv6_label = swkey->ipv6.label;
1237                 ipv6_key->ipv6_proto = swkey->ip.proto;
1238                 ipv6_key->ipv6_tclass = swkey->ip.tos;
1239                 ipv6_key->ipv6_hlimit = swkey->ip.ttl;
1240                 ipv6_key->ipv6_frag = swkey->ip.frag;
1241         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
1242                    swkey->eth.type == htons(ETH_P_RARP)) {
1243                 struct ovs_key_arp *arp_key;
1244
1245                 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
1246                 if (!nla)
1247                         goto nla_put_failure;
1248                 arp_key = nla_data(nla);
1249                 memset(arp_key, 0, sizeof(struct ovs_key_arp));
1250                 arp_key->arp_sip = swkey->ipv4.addr.src;
1251                 arp_key->arp_tip = swkey->ipv4.addr.dst;
1252                 arp_key->arp_op = htons(swkey->ip.proto);
1253                 memcpy(arp_key->arp_sha, swkey->ipv4.arp.sha, ETH_ALEN);
1254                 memcpy(arp_key->arp_tha, swkey->ipv4.arp.tha, ETH_ALEN);
1255         }
1256
1257         if ((swkey->eth.type == htons(ETH_P_IP) ||
1258              swkey->eth.type == htons(ETH_P_IPV6)) &&
1259              swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1260
1261                 if (swkey->ip.proto == IPPROTO_TCP) {
1262                         struct ovs_key_tcp *tcp_key;
1263
1264                         nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
1265                         if (!nla)
1266                                 goto nla_put_failure;
1267                         tcp_key = nla_data(nla);
1268                         if (swkey->eth.type == htons(ETH_P_IP)) {
1269                                 tcp_key->tcp_src = swkey->ipv4.tp.src;
1270                                 tcp_key->tcp_dst = swkey->ipv4.tp.dst;
1271                         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1272                                 tcp_key->tcp_src = swkey->ipv6.tp.src;
1273                                 tcp_key->tcp_dst = swkey->ipv6.tp.dst;
1274                         }
1275                 } else if (swkey->ip.proto == IPPROTO_UDP) {
1276                         struct ovs_key_udp *udp_key;
1277
1278                         nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
1279                         if (!nla)
1280                                 goto nla_put_failure;
1281                         udp_key = nla_data(nla);
1282                         if (swkey->eth.type == htons(ETH_P_IP)) {
1283                                 udp_key->udp_src = swkey->ipv4.tp.src;
1284                                 udp_key->udp_dst = swkey->ipv4.tp.dst;
1285                         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1286                                 udp_key->udp_src = swkey->ipv6.tp.src;
1287                                 udp_key->udp_dst = swkey->ipv6.tp.dst;
1288                         }
1289                 } else if (swkey->eth.type == htons(ETH_P_IP) &&
1290                            swkey->ip.proto == IPPROTO_ICMP) {
1291                         struct ovs_key_icmp *icmp_key;
1292
1293                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
1294                         if (!nla)
1295                                 goto nla_put_failure;
1296                         icmp_key = nla_data(nla);
1297                         icmp_key->icmp_type = ntohs(swkey->ipv4.tp.src);
1298                         icmp_key->icmp_code = ntohs(swkey->ipv4.tp.dst);
1299                 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
1300                            swkey->ip.proto == IPPROTO_ICMPV6) {
1301                         struct ovs_key_icmpv6 *icmpv6_key;
1302
1303                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
1304                                                 sizeof(*icmpv6_key));
1305                         if (!nla)
1306                                 goto nla_put_failure;
1307                         icmpv6_key = nla_data(nla);
1308                         icmpv6_key->icmpv6_type = ntohs(swkey->ipv6.tp.src);
1309                         icmpv6_key->icmpv6_code = ntohs(swkey->ipv6.tp.dst);
1310
1311                         if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
1312                             icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
1313                                 struct ovs_key_nd *nd_key;
1314
1315                                 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
1316                                 if (!nla)
1317                                         goto nla_put_failure;
1318                                 nd_key = nla_data(nla);
1319                                 memcpy(nd_key->nd_target, &swkey->ipv6.nd.target,
1320                                                         sizeof(nd_key->nd_target));
1321                                 memcpy(nd_key->nd_sll, swkey->ipv6.nd.sll, ETH_ALEN);
1322                                 memcpy(nd_key->nd_tll, swkey->ipv6.nd.tll, ETH_ALEN);
1323                         }
1324                 }
1325         }
1326
1327 unencap:
1328         if (encap)
1329                 nla_nest_end(skb, encap);
1330
1331         return 0;
1332
1333 nla_put_failure:
1334         return -EMSGSIZE;
1335 }
1336
1337 /* Initializes the flow module.
1338  * Returns zero if successful or a negative error code. */
1339 int ovs_flow_init(void)
1340 {
1341         flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow), 0,
1342                                         0, NULL);
1343         if (flow_cache == NULL)
1344                 return -ENOMEM;
1345
1346         return 0;
1347 }
1348
1349 /* Uninitializes the flow module. */
1350 void ovs_flow_exit(void)
1351 {
1352         kmem_cache_destroy(flow_cache);
1353 }