linux/net/openvswitch/flow.c
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   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
  46static struct kmem_cache *flow_cache;
  47
  48static 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
  57static 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
  63static 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
  82static 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
  98static bool udphdr_ok(struct sk_buff *skb)
  99{
 100        return pskb_may_pull(skb, skb_transport_offset(skb) +
 101                                  sizeof(struct udphdr));
 102}
 103
 104static bool icmphdr_ok(struct sk_buff *skb)
 105{
 106        return pskb_may_pull(skb, skb_transport_offset(skb) +
 107                                  sizeof(struct icmphdr));
 108}
 109
 110u64 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
 127static 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
 172static 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
 181void 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
 201struct 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        /* At least DP_MAX_PORTS actions are required to be able to flood a
 207         * packet to every port.  Factor of 2 allows for setting VLAN tags,
 208         * etc. */
 209        if (actions_len > 2 * DP_MAX_PORTS * nla_total_size(4))
 210                return ERR_PTR(-EINVAL);
 211
 212        sfa = kmalloc(sizeof(*sfa) + actions_len, GFP_KERNEL);
 213        if (!sfa)
 214                return ERR_PTR(-ENOMEM);
 215
 216        sfa->actions_len = actions_len;
 217        memcpy(sfa->actions, nla_data(actions), actions_len);
 218        return sfa;
 219}
 220
 221struct sw_flow *ovs_flow_alloc(void)
 222{
 223        struct sw_flow *flow;
 224
 225        flow = kmem_cache_alloc(flow_cache, GFP_KERNEL);
 226        if (!flow)
 227                return ERR_PTR(-ENOMEM);
 228
 229        spin_lock_init(&flow->lock);
 230        flow->sf_acts = NULL;
 231
 232        return flow;
 233}
 234
 235static struct hlist_head *find_bucket(struct flow_table *table, u32 hash)
 236{
 237        hash = jhash_1word(hash, table->hash_seed);
 238        return flex_array_get(table->buckets,
 239                                (hash & (table->n_buckets - 1)));
 240}
 241
 242static struct flex_array *alloc_buckets(unsigned int n_buckets)
 243{
 244        struct flex_array *buckets;
 245        int i, err;
 246
 247        buckets = flex_array_alloc(sizeof(struct hlist_head *),
 248                                   n_buckets, GFP_KERNEL);
 249        if (!buckets)
 250                return NULL;
 251
 252        err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL);
 253        if (err) {
 254                flex_array_free(buckets);
 255                return NULL;
 256        }
 257
 258        for (i = 0; i < n_buckets; i++)
 259                INIT_HLIST_HEAD((struct hlist_head *)
 260                                        flex_array_get(buckets, i));
 261
 262        return buckets;
 263}
 264
 265static void free_buckets(struct flex_array *buckets)
 266{
 267        flex_array_free(buckets);
 268}
 269
 270struct flow_table *ovs_flow_tbl_alloc(int new_size)
 271{
 272        struct flow_table *table = kmalloc(sizeof(*table), GFP_KERNEL);
 273
 274        if (!table)
 275                return NULL;
 276
 277        table->buckets = alloc_buckets(new_size);
 278
 279        if (!table->buckets) {
 280                kfree(table);
 281                return NULL;
 282        }
 283        table->n_buckets = new_size;
 284        table->count = 0;
 285        table->node_ver = 0;
 286        table->keep_flows = false;
 287        get_random_bytes(&table->hash_seed, sizeof(u32));
 288
 289        return table;
 290}
 291
 292void ovs_flow_tbl_destroy(struct flow_table *table)
 293{
 294        int i;
 295
 296        if (!table)
 297                return;
 298
 299        if (table->keep_flows)
 300                goto skip_flows;
 301
 302        for (i = 0; i < table->n_buckets; i++) {
 303                struct sw_flow *flow;
 304                struct hlist_head *head = flex_array_get(table->buckets, i);
 305                struct hlist_node *node, *n;
 306                int ver = table->node_ver;
 307
 308                hlist_for_each_entry_safe(flow, node, n, head, hash_node[ver]) {
 309                        hlist_del_rcu(&flow->hash_node[ver]);
 310                        ovs_flow_free(flow);
 311                }
 312        }
 313
 314skip_flows:
 315        free_buckets(table->buckets);
 316        kfree(table);
 317}
 318
 319static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu)
 320{
 321        struct flow_table *table = container_of(rcu, struct flow_table, rcu);
 322
 323        ovs_flow_tbl_destroy(table);
 324}
 325
 326void ovs_flow_tbl_deferred_destroy(struct flow_table *table)
 327{
 328        if (!table)
 329                return;
 330
 331        call_rcu(&table->rcu, flow_tbl_destroy_rcu_cb);
 332}
 333
 334struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *last)
 335{
 336        struct sw_flow *flow;
 337        struct hlist_head *head;
 338        struct hlist_node *n;
 339        int ver;
 340        int i;
 341
 342        ver = table->node_ver;
 343        while (*bucket < table->n_buckets) {
 344                i = 0;
 345                head = flex_array_get(table->buckets, *bucket);
 346                hlist_for_each_entry_rcu(flow, n, head, hash_node[ver]) {
 347                        if (i < *last) {
 348                                i++;
 349                                continue;
 350                        }
 351                        *last = i + 1;
 352                        return flow;
 353                }
 354                (*bucket)++;
 355                *last = 0;
 356        }
 357
 358        return NULL;
 359}
 360
 361static void flow_table_copy_flows(struct flow_table *old, struct flow_table *new)
 362{
 363        int old_ver;
 364        int i;
 365
 366        old_ver = old->node_ver;
 367        new->node_ver = !old_ver;
 368
 369        /* Insert in new table. */
 370        for (i = 0; i < old->n_buckets; i++) {
 371                struct sw_flow *flow;
 372                struct hlist_head *head;
 373                struct hlist_node *n;
 374
 375                head = flex_array_get(old->buckets, i);
 376
 377                hlist_for_each_entry(flow, n, head, hash_node[old_ver])
 378                        ovs_flow_tbl_insert(new, flow);
 379        }
 380        old->keep_flows = true;
 381}
 382
 383static struct flow_table *__flow_tbl_rehash(struct flow_table *table, int n_buckets)
 384{
 385        struct flow_table *new_table;
 386
 387        new_table = ovs_flow_tbl_alloc(n_buckets);
 388        if (!new_table)
 389                return ERR_PTR(-ENOMEM);
 390
 391        flow_table_copy_flows(table, new_table);
 392
 393        return new_table;
 394}
 395
 396struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table)
 397{
 398        return __flow_tbl_rehash(table, table->n_buckets);
 399}
 400
 401struct flow_table *ovs_flow_tbl_expand(struct flow_table *table)
 402{
 403        return __flow_tbl_rehash(table, table->n_buckets * 2);
 404}
 405
 406void ovs_flow_free(struct sw_flow *flow)
 407{
 408        if (unlikely(!flow))
 409                return;
 410
 411        kfree((struct sf_flow_acts __force *)flow->sf_acts);
 412        kmem_cache_free(flow_cache, flow);
 413}
 414
 415/* RCU callback used by ovs_flow_deferred_free. */
 416static void rcu_free_flow_callback(struct rcu_head *rcu)
 417{
 418        struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu);
 419
 420        ovs_flow_free(flow);
 421}
 422
 423/* Schedules 'flow' to be freed after the next RCU grace period.
 424 * The caller must hold rcu_read_lock for this to be sensible. */
 425void ovs_flow_deferred_free(struct sw_flow *flow)
 426{
 427        call_rcu(&flow->rcu, rcu_free_flow_callback);
 428}
 429
 430/* RCU callback used by ovs_flow_deferred_free_acts. */
 431static void rcu_free_acts_callback(struct rcu_head *rcu)
 432{
 433        struct sw_flow_actions *sf_acts = container_of(rcu,
 434                        struct sw_flow_actions, rcu);
 435        kfree(sf_acts);
 436}
 437
 438/* Schedules 'sf_acts' to be freed after the next RCU grace period.
 439 * The caller must hold rcu_read_lock for this to be sensible. */
 440void ovs_flow_deferred_free_acts(struct sw_flow_actions *sf_acts)
 441{
 442        call_rcu(&sf_acts->rcu, rcu_free_acts_callback);
 443}
 444
 445static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
 446{
 447        struct qtag_prefix {
 448                __be16 eth_type; /* ETH_P_8021Q */
 449                __be16 tci;
 450        };
 451        struct qtag_prefix *qp;
 452
 453        if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
 454                return 0;
 455
 456        if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
 457                                         sizeof(__be16))))
 458                return -ENOMEM;
 459
 460        qp = (struct qtag_prefix *) skb->data;
 461        key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
 462        __skb_pull(skb, sizeof(struct qtag_prefix));
 463
 464        return 0;
 465}
 466
 467static __be16 parse_ethertype(struct sk_buff *skb)
 468{
 469        struct llc_snap_hdr {
 470                u8  dsap;  /* Always 0xAA */
 471                u8  ssap;  /* Always 0xAA */
 472                u8  ctrl;
 473                u8  oui[3];
 474                __be16 ethertype;
 475        };
 476        struct llc_snap_hdr *llc;
 477        __be16 proto;
 478
 479        proto = *(__be16 *) skb->data;
 480        __skb_pull(skb, sizeof(__be16));
 481
 482        if (ntohs(proto) >= 1536)
 483                return proto;
 484
 485        if (skb->len < sizeof(struct llc_snap_hdr))
 486                return htons(ETH_P_802_2);
 487
 488        if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
 489                return htons(0);
 490
 491        llc = (struct llc_snap_hdr *) skb->data;
 492        if (llc->dsap != LLC_SAP_SNAP ||
 493            llc->ssap != LLC_SAP_SNAP ||
 494            (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
 495                return htons(ETH_P_802_2);
 496
 497        __skb_pull(skb, sizeof(struct llc_snap_hdr));
 498        return llc->ethertype;
 499}
 500
 501static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
 502                        int *key_lenp, int nh_len)
 503{
 504        struct icmp6hdr *icmp = icmp6_hdr(skb);
 505        int error = 0;
 506        int key_len;
 507
 508        /* The ICMPv6 type and code fields use the 16-bit transport port
 509         * fields, so we need to store them in 16-bit network byte order.
 510         */
 511        key->ipv6.tp.src = htons(icmp->icmp6_type);
 512        key->ipv6.tp.dst = htons(icmp->icmp6_code);
 513        key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 514
 515        if (icmp->icmp6_code == 0 &&
 516            (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
 517             icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 518                int icmp_len = skb->len - skb_transport_offset(skb);
 519                struct nd_msg *nd;
 520                int offset;
 521
 522                key_len = SW_FLOW_KEY_OFFSET(ipv6.nd);
 523
 524                /* In order to process neighbor discovery options, we need the
 525                 * entire packet.
 526                 */
 527                if (unlikely(icmp_len < sizeof(*nd)))
 528                        goto out;
 529                if (unlikely(skb_linearize(skb))) {
 530                        error = -ENOMEM;
 531                        goto out;
 532                }
 533
 534                nd = (struct nd_msg *)skb_transport_header(skb);
 535                key->ipv6.nd.target = nd->target;
 536                key_len = SW_FLOW_KEY_OFFSET(ipv6.nd);
 537
 538                icmp_len -= sizeof(*nd);
 539                offset = 0;
 540                while (icmp_len >= 8) {
 541                        struct nd_opt_hdr *nd_opt =
 542                                 (struct nd_opt_hdr *)(nd->opt + offset);
 543                        int opt_len = nd_opt->nd_opt_len * 8;
 544
 545                        if (unlikely(!opt_len || opt_len > icmp_len))
 546                                goto invalid;
 547
 548                        /* Store the link layer address if the appropriate
 549                         * option is provided.  It is considered an error if
 550                         * the same link layer option is specified twice.
 551                         */
 552                        if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
 553                            && opt_len == 8) {
 554                                if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
 555                                        goto invalid;
 556                                memcpy(key->ipv6.nd.sll,
 557                                    &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
 558                        } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
 559                                   && opt_len == 8) {
 560                                if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
 561                                        goto invalid;
 562                                memcpy(key->ipv6.nd.tll,
 563                                    &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
 564                        }
 565
 566                        icmp_len -= opt_len;
 567                        offset += opt_len;
 568                }
 569        }
 570
 571        goto out;
 572
 573invalid:
 574        memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
 575        memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
 576        memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
 577
 578out:
 579        *key_lenp = key_len;
 580        return error;
 581}
 582
 583/**
 584 * ovs_flow_extract - extracts a flow key from an Ethernet frame.
 585 * @skb: sk_buff that contains the frame, with skb->data pointing to the
 586 * Ethernet header
 587 * @in_port: port number on which @skb was received.
 588 * @key: output flow key
 589 * @key_lenp: length of output flow key
 590 *
 591 * The caller must ensure that skb->len >= ETH_HLEN.
 592 *
 593 * Returns 0 if successful, otherwise a negative errno value.
 594 *
 595 * Initializes @skb header pointers as follows:
 596 *
 597 *    - skb->mac_header: the Ethernet header.
 598 *
 599 *    - skb->network_header: just past the Ethernet header, or just past the
 600 *      VLAN header, to the first byte of the Ethernet payload.
 601 *
 602 *    - skb->transport_header: If key->dl_type is ETH_P_IP or ETH_P_IPV6
 603 *      on output, then just past the IP header, if one is present and
 604 *      of a correct length, otherwise the same as skb->network_header.
 605 *      For other key->dl_type values it is left untouched.
 606 */
 607int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key,
 608                 int *key_lenp)
 609{
 610        int error = 0;
 611        int key_len = SW_FLOW_KEY_OFFSET(eth);
 612        struct ethhdr *eth;
 613
 614        memset(key, 0, sizeof(*key));
 615
 616        key->phy.priority = skb->priority;
 617        key->phy.in_port = in_port;
 618
 619        skb_reset_mac_header(skb);
 620
 621        /* Link layer.  We are guaranteed to have at least the 14 byte Ethernet
 622         * header in the linear data area.
 623         */
 624        eth = eth_hdr(skb);
 625        memcpy(key->eth.src, eth->h_source, ETH_ALEN);
 626        memcpy(key->eth.dst, eth->h_dest, ETH_ALEN);
 627
 628        __skb_pull(skb, 2 * ETH_ALEN);
 629
 630        if (vlan_tx_tag_present(skb))
 631                key->eth.tci = htons(skb->vlan_tci);
 632        else if (eth->h_proto == htons(ETH_P_8021Q))
 633                if (unlikely(parse_vlan(skb, key)))
 634                        return -ENOMEM;
 635
 636        key->eth.type = parse_ethertype(skb);
 637        if (unlikely(key->eth.type == htons(0)))
 638                return -ENOMEM;
 639
 640        skb_reset_network_header(skb);
 641        __skb_push(skb, skb->data - skb_mac_header(skb));
 642
 643        /* Network layer. */
 644        if (key->eth.type == htons(ETH_P_IP)) {
 645                struct iphdr *nh;
 646                __be16 offset;
 647
 648                key_len = SW_FLOW_KEY_OFFSET(ipv4.addr);
 649
 650                error = check_iphdr(skb);
 651                if (unlikely(error)) {
 652                        if (error == -EINVAL) {
 653                                skb->transport_header = skb->network_header;
 654                                error = 0;
 655                        }
 656                        goto out;
 657                }
 658
 659                nh = ip_hdr(skb);
 660                key->ipv4.addr.src = nh->saddr;
 661                key->ipv4.addr.dst = nh->daddr;
 662
 663                key->ip.proto = nh->protocol;
 664                key->ip.tos = nh->tos;
 665                key->ip.ttl = nh->ttl;
 666
 667                offset = nh->frag_off & htons(IP_OFFSET);
 668                if (offset) {
 669                        key->ip.frag = OVS_FRAG_TYPE_LATER;
 670                        goto out;
 671                }
 672                if (nh->frag_off & htons(IP_MF) ||
 673                         skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 674                        key->ip.frag = OVS_FRAG_TYPE_FIRST;
 675
 676                /* Transport layer. */
 677                if (key->ip.proto == IPPROTO_TCP) {
 678                        key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
 679                        if (tcphdr_ok(skb)) {
 680                                struct tcphdr *tcp = tcp_hdr(skb);
 681                                key->ipv4.tp.src = tcp->source;
 682                                key->ipv4.tp.dst = tcp->dest;
 683                        }
 684                } else if (key->ip.proto == IPPROTO_UDP) {
 685                        key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
 686                        if (udphdr_ok(skb)) {
 687                                struct udphdr *udp = udp_hdr(skb);
 688                                key->ipv4.tp.src = udp->source;
 689                                key->ipv4.tp.dst = udp->dest;
 690                        }
 691                } else if (key->ip.proto == IPPROTO_ICMP) {
 692                        key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
 693                        if (icmphdr_ok(skb)) {
 694                                struct icmphdr *icmp = icmp_hdr(skb);
 695                                /* The ICMP type and code fields use the 16-bit
 696                                 * transport port fields, so we need to store
 697                                 * them in 16-bit network byte order. */
 698                                key->ipv4.tp.src = htons(icmp->type);
 699                                key->ipv4.tp.dst = htons(icmp->code);
 700                        }
 701                }
 702
 703        } else if (key->eth.type == htons(ETH_P_ARP) && arphdr_ok(skb)) {
 704                struct arp_eth_header *arp;
 705
 706                arp = (struct arp_eth_header *)skb_network_header(skb);
 707
 708                if (arp->ar_hrd == htons(ARPHRD_ETHER)
 709                                && arp->ar_pro == htons(ETH_P_IP)
 710                                && arp->ar_hln == ETH_ALEN
 711                                && arp->ar_pln == 4) {
 712
 713                        /* We only match on the lower 8 bits of the opcode. */
 714                        if (ntohs(arp->ar_op) <= 0xff)
 715                                key->ip.proto = ntohs(arp->ar_op);
 716
 717                        if (key->ip.proto == ARPOP_REQUEST
 718                                        || key->ip.proto == ARPOP_REPLY) {
 719                                memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
 720                                memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
 721                                memcpy(key->ipv4.arp.sha, arp->ar_sha, ETH_ALEN);
 722                                memcpy(key->ipv4.arp.tha, arp->ar_tha, ETH_ALEN);
 723                                key_len = SW_FLOW_KEY_OFFSET(ipv4.arp);
 724                        }
 725                }
 726        } else if (key->eth.type == htons(ETH_P_IPV6)) {
 727                int nh_len;             /* IPv6 Header + Extensions */
 728
 729                nh_len = parse_ipv6hdr(skb, key, &key_len);
 730                if (unlikely(nh_len < 0)) {
 731                        if (nh_len == -EINVAL)
 732                                skb->transport_header = skb->network_header;
 733                        else
 734                                error = nh_len;
 735                        goto out;
 736                }
 737
 738                if (key->ip.frag == OVS_FRAG_TYPE_LATER)
 739                        goto out;
 740                if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 741                        key->ip.frag = OVS_FRAG_TYPE_FIRST;
 742
 743                /* Transport layer. */
 744                if (key->ip.proto == NEXTHDR_TCP) {
 745                        key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 746                        if (tcphdr_ok(skb)) {
 747                                struct tcphdr *tcp = tcp_hdr(skb);
 748                                key->ipv6.tp.src = tcp->source;
 749                                key->ipv6.tp.dst = tcp->dest;
 750                        }
 751                } else if (key->ip.proto == NEXTHDR_UDP) {
 752                        key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 753                        if (udphdr_ok(skb)) {
 754                                struct udphdr *udp = udp_hdr(skb);
 755                                key->ipv6.tp.src = udp->source;
 756                                key->ipv6.tp.dst = udp->dest;
 757                        }
 758                } else if (key->ip.proto == NEXTHDR_ICMP) {
 759                        key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 760                        if (icmp6hdr_ok(skb)) {
 761                                error = parse_icmpv6(skb, key, &key_len, nh_len);
 762                                if (error < 0)
 763                                        goto out;
 764                        }
 765                }
 766        }
 767
 768out:
 769        *key_lenp = key_len;
 770        return error;
 771}
 772
 773u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len)
 774{
 775        return jhash2((u32 *)key, DIV_ROUND_UP(key_len, sizeof(u32)), 0);
 776}
 777
 778struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table,
 779                                struct sw_flow_key *key, int key_len)
 780{
 781        struct sw_flow *flow;
 782        struct hlist_node *n;
 783        struct hlist_head *head;
 784        u32 hash;
 785
 786        hash = ovs_flow_hash(key, key_len);
 787
 788        head = find_bucket(table, hash);
 789        hlist_for_each_entry_rcu(flow, n, head, hash_node[table->node_ver]) {
 790
 791                if (flow->hash == hash &&
 792                    !memcmp(&flow->key, key, key_len)) {
 793                        return flow;
 794                }
 795        }
 796        return NULL;
 797}
 798
 799void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow)
 800{
 801        struct hlist_head *head;
 802
 803        head = find_bucket(table, flow->hash);
 804        hlist_add_head_rcu(&flow->hash_node[table->node_ver], head);
 805        table->count++;
 806}
 807
 808void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow)
 809{
 810        hlist_del_rcu(&flow->hash_node[table->node_ver]);
 811        table->count--;
 812        BUG_ON(table->count < 0);
 813}
 814
 815/* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
 816const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
 817        [OVS_KEY_ATTR_ENCAP] = -1,
 818        [OVS_KEY_ATTR_PRIORITY] = sizeof(u32),
 819        [OVS_KEY_ATTR_IN_PORT] = sizeof(u32),
 820        [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet),
 821        [OVS_KEY_ATTR_VLAN] = sizeof(__be16),
 822        [OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16),
 823        [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
 824        [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
 825        [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
 826        [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
 827        [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
 828        [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
 829        [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
 830        [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
 831};
 832
 833static int ipv4_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_len,
 834                                  const struct nlattr *a[], u32 *attrs)
 835{
 836        const struct ovs_key_icmp *icmp_key;
 837        const struct ovs_key_tcp *tcp_key;
 838        const struct ovs_key_udp *udp_key;
 839
 840        switch (swkey->ip.proto) {
 841        case IPPROTO_TCP:
 842                if (!(*attrs & (1 << OVS_KEY_ATTR_TCP)))
 843                        return -EINVAL;
 844                *attrs &= ~(1 << OVS_KEY_ATTR_TCP);
 845
 846                *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
 847                tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
 848                swkey->ipv4.tp.src = tcp_key->tcp_src;
 849                swkey->ipv4.tp.dst = tcp_key->tcp_dst;
 850                break;
 851
 852        case IPPROTO_UDP:
 853                if (!(*attrs & (1 << OVS_KEY_ATTR_UDP)))
 854                        return -EINVAL;
 855                *attrs &= ~(1 << OVS_KEY_ATTR_UDP);
 856
 857                *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
 858                udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
 859                swkey->ipv4.tp.src = udp_key->udp_src;
 860                swkey->ipv4.tp.dst = udp_key->udp_dst;
 861                break;
 862
 863        case IPPROTO_ICMP:
 864                if (!(*attrs & (1 << OVS_KEY_ATTR_ICMP)))
 865                        return -EINVAL;
 866                *attrs &= ~(1 << OVS_KEY_ATTR_ICMP);
 867
 868                *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
 869                icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
 870                swkey->ipv4.tp.src = htons(icmp_key->icmp_type);
 871                swkey->ipv4.tp.dst = htons(icmp_key->icmp_code);
 872                break;
 873        }
 874
 875        return 0;
 876}
 877
 878static int ipv6_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_len,
 879                                  const struct nlattr *a[], u32 *attrs)
 880{
 881        const struct ovs_key_icmpv6 *icmpv6_key;
 882        const struct ovs_key_tcp *tcp_key;
 883        const struct ovs_key_udp *udp_key;
 884
 885        switch (swkey->ip.proto) {
 886        case IPPROTO_TCP:
 887                if (!(*attrs & (1 << OVS_KEY_ATTR_TCP)))
 888                        return -EINVAL;
 889                *attrs &= ~(1 << OVS_KEY_ATTR_TCP);
 890
 891                *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 892                tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
 893                swkey->ipv6.tp.src = tcp_key->tcp_src;
 894                swkey->ipv6.tp.dst = tcp_key->tcp_dst;
 895                break;
 896
 897        case IPPROTO_UDP:
 898                if (!(*attrs & (1 << OVS_KEY_ATTR_UDP)))
 899                        return -EINVAL;
 900                *attrs &= ~(1 << OVS_KEY_ATTR_UDP);
 901
 902                *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 903                udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
 904                swkey->ipv6.tp.src = udp_key->udp_src;
 905                swkey->ipv6.tp.dst = udp_key->udp_dst;
 906                break;
 907
 908        case IPPROTO_ICMPV6:
 909                if (!(*attrs & (1 << OVS_KEY_ATTR_ICMPV6)))
 910                        return -EINVAL;
 911                *attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6);
 912
 913                *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
 914                icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
 915                swkey->ipv6.tp.src = htons(icmpv6_key->icmpv6_type);
 916                swkey->ipv6.tp.dst = htons(icmpv6_key->icmpv6_code);
 917
 918                if (swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 919                    swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 920                        const struct ovs_key_nd *nd_key;
 921
 922                        if (!(*attrs & (1 << OVS_KEY_ATTR_ND)))
 923                                return -EINVAL;
 924                        *attrs &= ~(1 << OVS_KEY_ATTR_ND);
 925
 926                        *key_len = SW_FLOW_KEY_OFFSET(ipv6.nd);
 927                        nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
 928                        memcpy(&swkey->ipv6.nd.target, nd_key->nd_target,
 929                               sizeof(swkey->ipv6.nd.target));
 930                        memcpy(swkey->ipv6.nd.sll, nd_key->nd_sll, ETH_ALEN);
 931                        memcpy(swkey->ipv6.nd.tll, nd_key->nd_tll, ETH_ALEN);
 932                }
 933                break;
 934        }
 935
 936        return 0;
 937}
 938
 939static int parse_flow_nlattrs(const struct nlattr *attr,
 940                              const struct nlattr *a[], u32 *attrsp)
 941{
 942        const struct nlattr *nla;
 943        u32 attrs;
 944        int rem;
 945
 946        attrs = 0;
 947        nla_for_each_nested(nla, attr, rem) {
 948                u16 type = nla_type(nla);
 949                int expected_len;
 950
 951                if (type > OVS_KEY_ATTR_MAX || attrs & (1 << type))
 952                        return -EINVAL;
 953
 954                expected_len = ovs_key_lens[type];
 955                if (nla_len(nla) != expected_len && expected_len != -1)
 956                        return -EINVAL;
 957
 958                attrs |= 1 << type;
 959                a[type] = nla;
 960        }
 961        if (rem)
 962                return -EINVAL;
 963
 964        *attrsp = attrs;
 965        return 0;
 966}
 967
 968/**
 969 * ovs_flow_from_nlattrs - parses Netlink attributes into a flow key.
 970 * @swkey: receives the extracted flow key.
 971 * @key_lenp: number of bytes used in @swkey.
 972 * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
 973 * sequence.
 974 */
 975int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
 976                      const struct nlattr *attr)
 977{
 978        const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
 979        const struct ovs_key_ethernet *eth_key;
 980        int key_len;
 981        u32 attrs;
 982        int err;
 983
 984        memset(swkey, 0, sizeof(struct sw_flow_key));
 985        key_len = SW_FLOW_KEY_OFFSET(eth);
 986
 987        err = parse_flow_nlattrs(attr, a, &attrs);
 988        if (err)
 989                return err;
 990
 991        /* Metadata attributes. */
 992        if (attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
 993                swkey->phy.priority = nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]);
 994                attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY);
 995        }
 996        if (attrs & (1 << OVS_KEY_ATTR_IN_PORT)) {
 997                u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
 998                if (in_port >= DP_MAX_PORTS)
 999                        return -EINVAL;
1000                swkey->phy.in_port = in_port;
1001                attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT);
1002        } else {
1003                swkey->phy.in_port = USHRT_MAX;
1004        }
1005
1006        /* Data attributes. */
1007        if (!(attrs & (1 << OVS_KEY_ATTR_ETHERNET)))
1008                return -EINVAL;
1009        attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET);
1010
1011        eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
1012        memcpy(swkey->eth.src, eth_key->eth_src, ETH_ALEN);
1013        memcpy(swkey->eth.dst, eth_key->eth_dst, ETH_ALEN);
1014
1015        if (attrs & (1u << OVS_KEY_ATTR_ETHERTYPE) &&
1016            nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q)) {
1017                const struct nlattr *encap;
1018                __be16 tci;
1019
1020                if (attrs != ((1 << OVS_KEY_ATTR_VLAN) |
1021                              (1 << OVS_KEY_ATTR_ETHERTYPE) |
1022                              (1 << OVS_KEY_ATTR_ENCAP)))
1023                        return -EINVAL;
1024
1025                encap = a[OVS_KEY_ATTR_ENCAP];
1026                tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1027                if (tci & htons(VLAN_TAG_PRESENT)) {
1028                        swkey->eth.tci = tci;
1029
1030                        err = parse_flow_nlattrs(encap, a, &attrs);
1031                        if (err)
1032                                return err;
1033                } else if (!tci) {
1034                        /* Corner case for truncated 802.1Q header. */
1035                        if (nla_len(encap))
1036                                return -EINVAL;
1037
1038                        swkey->eth.type = htons(ETH_P_8021Q);
1039                        *key_lenp = key_len;
1040                        return 0;
1041                } else {
1042                        return -EINVAL;
1043                }
1044        }
1045
1046        if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
1047                swkey->eth.type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1048                if (ntohs(swkey->eth.type) < 1536)
1049                        return -EINVAL;
1050                attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
1051        } else {
1052                swkey->eth.type = htons(ETH_P_802_2);
1053        }
1054
1055        if (swkey->eth.type == htons(ETH_P_IP)) {
1056                const struct ovs_key_ipv4 *ipv4_key;
1057
1058                if (!(attrs & (1 << OVS_KEY_ATTR_IPV4)))
1059                        return -EINVAL;
1060                attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
1061
1062                key_len = SW_FLOW_KEY_OFFSET(ipv4.addr);
1063                ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
1064                if (ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX)
1065                        return -EINVAL;
1066                swkey->ip.proto = ipv4_key->ipv4_proto;
1067                swkey->ip.tos = ipv4_key->ipv4_tos;
1068                swkey->ip.ttl = ipv4_key->ipv4_ttl;
1069                swkey->ip.frag = ipv4_key->ipv4_frag;
1070                swkey->ipv4.addr.src = ipv4_key->ipv4_src;
1071                swkey->ipv4.addr.dst = ipv4_key->ipv4_dst;
1072
1073                if (swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1074                        err = ipv4_flow_from_nlattrs(swkey, &key_len, a, &attrs);
1075                        if (err)
1076                                return err;
1077                }
1078        } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1079                const struct ovs_key_ipv6 *ipv6_key;
1080
1081                if (!(attrs & (1 << OVS_KEY_ATTR_IPV6)))
1082                        return -EINVAL;
1083                attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
1084
1085                key_len = SW_FLOW_KEY_OFFSET(ipv6.label);
1086                ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
1087                if (ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX)
1088                        return -EINVAL;
1089                swkey->ipv6.label = ipv6_key->ipv6_label;
1090                swkey->ip.proto = ipv6_key->ipv6_proto;
1091                swkey->ip.tos = ipv6_key->ipv6_tclass;
1092                swkey->ip.ttl = ipv6_key->ipv6_hlimit;
1093                swkey->ip.frag = ipv6_key->ipv6_frag;
1094                memcpy(&swkey->ipv6.addr.src, ipv6_key->ipv6_src,
1095                       sizeof(swkey->ipv6.addr.src));
1096                memcpy(&swkey->ipv6.addr.dst, ipv6_key->ipv6_dst,
1097                       sizeof(swkey->ipv6.addr.dst));
1098
1099                if (swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1100                        err = ipv6_flow_from_nlattrs(swkey, &key_len, a, &attrs);
1101                        if (err)
1102                                return err;
1103                }
1104        } else if (swkey->eth.type == htons(ETH_P_ARP)) {
1105                const struct ovs_key_arp *arp_key;
1106
1107                if (!(attrs & (1 << OVS_KEY_ATTR_ARP)))
1108                        return -EINVAL;
1109                attrs &= ~(1 << OVS_KEY_ATTR_ARP);
1110
1111                key_len = SW_FLOW_KEY_OFFSET(ipv4.arp);
1112                arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
1113                swkey->ipv4.addr.src = arp_key->arp_sip;
1114                swkey->ipv4.addr.dst = arp_key->arp_tip;
1115                if (arp_key->arp_op & htons(0xff00))
1116                        return -EINVAL;
1117                swkey->ip.proto = ntohs(arp_key->arp_op);
1118                memcpy(swkey->ipv4.arp.sha, arp_key->arp_sha, ETH_ALEN);
1119                memcpy(swkey->ipv4.arp.tha, arp_key->arp_tha, ETH_ALEN);
1120        }
1121
1122        if (attrs)
1123                return -EINVAL;
1124        *key_lenp = key_len;
1125
1126        return 0;
1127}
1128
1129/**
1130 * ovs_flow_metadata_from_nlattrs - parses Netlink attributes into a flow key.
1131 * @in_port: receives the extracted input port.
1132 * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1133 * sequence.
1134 *
1135 * This parses a series of Netlink attributes that form a flow key, which must
1136 * take the same form accepted by flow_from_nlattrs(), but only enough of it to
1137 * get the metadata, that is, the parts of the flow key that cannot be
1138 * extracted from the packet itself.
1139 */
1140int ovs_flow_metadata_from_nlattrs(u32 *priority, u16 *in_port,
1141                               const struct nlattr *attr)
1142{
1143        const struct nlattr *nla;
1144        int rem;
1145
1146        *in_port = USHRT_MAX;
1147        *priority = 0;
1148
1149        nla_for_each_nested(nla, attr, rem) {
1150                int type = nla_type(nla);
1151
1152                if (type <= OVS_KEY_ATTR_MAX && ovs_key_lens[type] > 0) {
1153                        if (nla_len(nla) != ovs_key_lens[type])
1154                                return -EINVAL;
1155
1156                        switch (type) {
1157                        case OVS_KEY_ATTR_PRIORITY:
1158                                *priority = nla_get_u32(nla);
1159                                break;
1160
1161                        case OVS_KEY_ATTR_IN_PORT:
1162                                if (nla_get_u32(nla) >= DP_MAX_PORTS)
1163                                        return -EINVAL;
1164                                *in_port = nla_get_u32(nla);
1165                                break;
1166                        }
1167                }
1168        }
1169        if (rem)
1170                return -EINVAL;
1171        return 0;
1172}
1173
1174int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb)
1175{
1176        struct ovs_key_ethernet *eth_key;
1177        struct nlattr *nla, *encap;
1178
1179        if (swkey->phy.priority &&
1180            nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, swkey->phy.priority))
1181                goto nla_put_failure;
1182
1183        if (swkey->phy.in_port != USHRT_MAX &&
1184            nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, swkey->phy.in_port))
1185                goto nla_put_failure;
1186
1187        nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
1188        if (!nla)
1189                goto nla_put_failure;
1190        eth_key = nla_data(nla);
1191        memcpy(eth_key->eth_src, swkey->eth.src, ETH_ALEN);
1192        memcpy(eth_key->eth_dst, swkey->eth.dst, ETH_ALEN);
1193
1194        if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
1195                if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, htons(ETH_P_8021Q)) ||
1196                    nla_put_be16(skb, OVS_KEY_ATTR_VLAN, swkey->eth.tci))
1197                        goto nla_put_failure;
1198                encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
1199                if (!swkey->eth.tci)
1200                        goto unencap;
1201        } else {
1202                encap = NULL;
1203        }
1204
1205        if (swkey->eth.type == htons(ETH_P_802_2))
1206                goto unencap;
1207
1208        if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, swkey->eth.type))
1209                goto nla_put_failure;
1210
1211        if (swkey->eth.type == htons(ETH_P_IP)) {
1212                struct ovs_key_ipv4 *ipv4_key;
1213
1214                nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
1215                if (!nla)
1216                        goto nla_put_failure;
1217                ipv4_key = nla_data(nla);
1218                ipv4_key->ipv4_src = swkey->ipv4.addr.src;
1219                ipv4_key->ipv4_dst = swkey->ipv4.addr.dst;
1220                ipv4_key->ipv4_proto = swkey->ip.proto;
1221                ipv4_key->ipv4_tos = swkey->ip.tos;
1222                ipv4_key->ipv4_ttl = swkey->ip.ttl;
1223                ipv4_key->ipv4_frag = swkey->ip.frag;
1224        } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1225                struct ovs_key_ipv6 *ipv6_key;
1226
1227                nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
1228                if (!nla)
1229                        goto nla_put_failure;
1230                ipv6_key = nla_data(nla);
1231                memcpy(ipv6_key->ipv6_src, &swkey->ipv6.addr.src,
1232                                sizeof(ipv6_key->ipv6_src));
1233                memcpy(ipv6_key->ipv6_dst, &swkey->ipv6.addr.dst,
1234                                sizeof(ipv6_key->ipv6_dst));
1235                ipv6_key->ipv6_label = swkey->ipv6.label;
1236                ipv6_key->ipv6_proto = swkey->ip.proto;
1237                ipv6_key->ipv6_tclass = swkey->ip.tos;
1238                ipv6_key->ipv6_hlimit = swkey->ip.ttl;
1239                ipv6_key->ipv6_frag = swkey->ip.frag;
1240        } else if (swkey->eth.type == htons(ETH_P_ARP)) {
1241                struct ovs_key_arp *arp_key;
1242
1243                nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
1244                if (!nla)
1245                        goto nla_put_failure;
1246                arp_key = nla_data(nla);
1247                memset(arp_key, 0, sizeof(struct ovs_key_arp));
1248                arp_key->arp_sip = swkey->ipv4.addr.src;
1249                arp_key->arp_tip = swkey->ipv4.addr.dst;
1250                arp_key->arp_op = htons(swkey->ip.proto);
1251                memcpy(arp_key->arp_sha, swkey->ipv4.arp.sha, ETH_ALEN);
1252                memcpy(arp_key->arp_tha, swkey->ipv4.arp.tha, ETH_ALEN);
1253        }
1254
1255        if ((swkey->eth.type == htons(ETH_P_IP) ||
1256             swkey->eth.type == htons(ETH_P_IPV6)) &&
1257             swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1258
1259                if (swkey->ip.proto == IPPROTO_TCP) {
1260                        struct ovs_key_tcp *tcp_key;
1261
1262                        nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
1263                        if (!nla)
1264                                goto nla_put_failure;
1265                        tcp_key = nla_data(nla);
1266                        if (swkey->eth.type == htons(ETH_P_IP)) {
1267                                tcp_key->tcp_src = swkey->ipv4.tp.src;
1268                                tcp_key->tcp_dst = swkey->ipv4.tp.dst;
1269                        } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1270                                tcp_key->tcp_src = swkey->ipv6.tp.src;
1271                                tcp_key->tcp_dst = swkey->ipv6.tp.dst;
1272                        }
1273                } else if (swkey->ip.proto == IPPROTO_UDP) {
1274                        struct ovs_key_udp *udp_key;
1275
1276                        nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
1277                        if (!nla)
1278                                goto nla_put_failure;
1279                        udp_key = nla_data(nla);
1280                        if (swkey->eth.type == htons(ETH_P_IP)) {
1281                                udp_key->udp_src = swkey->ipv4.tp.src;
1282                                udp_key->udp_dst = swkey->ipv4.tp.dst;
1283                        } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1284                                udp_key->udp_src = swkey->ipv6.tp.src;
1285                                udp_key->udp_dst = swkey->ipv6.tp.dst;
1286                        }
1287                } else if (swkey->eth.type == htons(ETH_P_IP) &&
1288                           swkey->ip.proto == IPPROTO_ICMP) {
1289                        struct ovs_key_icmp *icmp_key;
1290
1291                        nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
1292                        if (!nla)
1293                                goto nla_put_failure;
1294                        icmp_key = nla_data(nla);
1295                        icmp_key->icmp_type = ntohs(swkey->ipv4.tp.src);
1296                        icmp_key->icmp_code = ntohs(swkey->ipv4.tp.dst);
1297                } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
1298                           swkey->ip.proto == IPPROTO_ICMPV6) {
1299                        struct ovs_key_icmpv6 *icmpv6_key;
1300
1301                        nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
1302                                                sizeof(*icmpv6_key));
1303                        if (!nla)
1304                                goto nla_put_failure;
1305                        icmpv6_key = nla_data(nla);
1306                        icmpv6_key->icmpv6_type = ntohs(swkey->ipv6.tp.src);
1307                        icmpv6_key->icmpv6_code = ntohs(swkey->ipv6.tp.dst);
1308
1309                        if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
1310                            icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
1311                                struct ovs_key_nd *nd_key;
1312
1313                                nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
1314                                if (!nla)
1315                                        goto nla_put_failure;
1316                                nd_key = nla_data(nla);
1317                                memcpy(nd_key->nd_target, &swkey->ipv6.nd.target,
1318                                                        sizeof(nd_key->nd_target));
1319                                memcpy(nd_key->nd_sll, swkey->ipv6.nd.sll, ETH_ALEN);
1320                                memcpy(nd_key->nd_tll, swkey->ipv6.nd.tll, ETH_ALEN);
1321                        }
1322                }
1323        }
1324
1325unencap:
1326        if (encap)
1327                nla_nest_end(skb, encap);
1328
1329        return 0;
1330
1331nla_put_failure:
1332        return -EMSGSIZE;
1333}
1334
1335/* Initializes the flow module.
1336 * Returns zero if successful or a negative error code. */
1337int ovs_flow_init(void)
1338{
1339        flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow), 0,
1340                                        0, NULL);
1341        if (flow_cache == NULL)
1342                return -ENOMEM;
1343
1344        return 0;
1345}
1346
1347/* Uninitializes the flow module. */
1348void ovs_flow_exit(void)
1349{
1350        kmem_cache_destroy(flow_cache);
1351}
1352
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