datapath/flow.c

   1 /*
   2  * Copyright (c) 2007-2013 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 #include "vlan.h"
  47
  48 static struct kmem_cache *flow_cache;
  49
  50 static void ovs_sw_flow_mask_set(struct sw_flow_mask *mask,
  51                 struct sw_flow_key_range *range, u8 val);
  52
  53 static void update_range__(struct sw_flow_match *match,
  54                           size_t offset, size_t size, bool is_mask)
  55 {
  56         struct sw_flow_key_range *range = NULL;
  57         size_t start = offset;
  58         size_t end = offset + size;
  59
  60         if (!is_mask)
  61                 range = &match->range;
  62         else if (match->mask)
  63                 range = &match->mask->range;
  64
  65         if (!range)
  66                 return;
  67
  68         if (range->start == range->end) {
  69                 range->start = start;
  70                 range->end = end;
  71                 return;
  72         }
  73
  74         if (range->start > start)
  75                 range->start = start;
  76
  77         if (range->end < end)
  78                 range->end = end;
  79 }
  80
  81 #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
  82         do { \
  83                 update_range__(match, offsetof(struct sw_flow_key, field),  \
  84                                      sizeof((match)->key->field), is_mask); \
  85                 if (is_mask) {                                              \
  86                         if ((match)->mask)                                  \
  87                                 (match)->mask->key.field = value;           \
  88                 } else {                                                    \
  89                         (match)->key->field = value;                        \
  90                 }                                                           \
  91         } while (0)
  92
  93 #define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask) \
  94         do { \
  95                 update_range__(match, offsetof(struct sw_flow_key, field),  \
  96                                 len, is_mask);                              \
  97                 if (is_mask) {                                              \
  98                         if ((match)->mask)                                  \
  99                                 memcpy(&(match)->mask->key.field, value_p, len);\
 100                 } else {                                                    \
 101                         memcpy(&(match)->key->field, value_p, len);         \
 102                 }                                                           \
 103         } while (0)
 104
 105 void ovs_match_init(struct sw_flow_match *match,
 106                     struct sw_flow_key *key,
 107                     struct sw_flow_mask *mask)
 108 {
 109         memset(match, 0, sizeof(*match));
 110         match->key = key;
 111         match->mask = mask;
 112
 113         memset(key, 0, sizeof(*key));
 114
 115         if (mask) {
 116                 memset(&mask->key, 0, sizeof(mask->key));
 117                 mask->range.start = mask->range.end = 0;
 118         }
 119 }
 120
 121 static bool ovs_match_validate(const struct sw_flow_match *match,
 122                 u64 key_attrs, u64 mask_attrs)
 123 {
 124         u64 key_expected = 1ULL << OVS_KEY_ATTR_ETHERNET;
 125         u64 mask_allowed = key_attrs;  /* At most allow all key attributes */
 126
 127         /* The following mask attributes allowed only if they
 128          * pass the validation tests. */
 129         mask_allowed &= ~((1ULL << OVS_KEY_ATTR_IPV4)
 130                         | (1ULL << OVS_KEY_ATTR_IPV6)
 131                         | (1ULL << OVS_KEY_ATTR_TCP)
 132                         | (1ULL << OVS_KEY_ATTR_UDP)
 133                         | (1ULL << OVS_KEY_ATTR_ICMP)
 134                         | (1ULL << OVS_KEY_ATTR_ICMPV6)
 135                         | (1ULL << OVS_KEY_ATTR_ARP)
 136                         | (1ULL << OVS_KEY_ATTR_ND));
 137
 138         /* Always allowed mask fields. */
 139         mask_allowed |= ((1ULL << OVS_KEY_ATTR_TUNNEL)
 140                        | (1ULL << OVS_KEY_ATTR_IN_PORT)
 141                        | (11ULL << OVS_KEY_ATTR_ETHERTYPE));
 142
 143         /* Check key attributes. */
 144         if (match->key->eth.type == htons(ETH_P_ARP)
 145                         || match->key->eth.type == htons(ETH_P_RARP)) {
 146                 key_expected |= 1ULL << OVS_KEY_ATTR_ARP;
 147                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 148                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ARP;
 149         }
 150
 151         if (match->key->eth.type == htons(ETH_P_IP)) {
 152                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV4;
 153                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 154                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV4;
 155
 156                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 157                         if (match->key->ip.proto == IPPROTO_UDP) {
 158                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 159                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 160                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 161                         }
 162
 163                         if (match->key->ip.proto == IPPROTO_TCP) {
 164                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 165                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 166                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 167                         }
 168
 169                         if (match->key->ip.proto == IPPROTO_ICMP) {
 170                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMP;
 171                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 172                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMP;
 173                         }
 174                 }
 175         }
 176
 177         if (match->key->eth.type == htons(ETH_P_IPV6)) {
 178                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV6;
 179                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 180                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV6;
 181
 182                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 183                         if (match->key->ip.proto == IPPROTO_UDP) {
 184                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 185                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 186                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 187                         }
 188
 189                         if (match->key->ip.proto == IPPROTO_TCP) {
 190                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 191                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 192                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 193                         }
 194
 195                         if (match->key->ip.proto == IPPROTO_ICMPV6) {
 196                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 197                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 198                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 199
 200                                 if (match->key->ipv6.tp.src ==
 201                                                 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 202                                     match->key->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 203                                         key_expected |= 1ULL << OVS_KEY_ATTR_ND;
 204                                         if (match->mask && (match->mask->key.ipv6.tp.src == htons(0xffff)))
 205                                                 mask_allowed |= 1ULL << OVS_KEY_ATTR_ND;
 206                                 }
 207                         }
 208                 }
 209         }
 210
 211         if ((key_attrs & key_expected) != key_expected) {
 212                 /* Key attributes check failed. */
 213                 OVS_NLERR("Missing expected key attributes (key_attrs=%llx, expected=%llx).\n",
 214                                 key_attrs, key_expected);
 215                 return false;
 216         }
 217
 218         if ((mask_attrs & mask_allowed) != mask_attrs) {
 219                 /* Mask attributes check failed. */
 220                 OVS_NLERR("Contain more than allowed mask fields (mask_attrs=%llx, mask_allowed=%llx).\n",
 221                                 mask_attrs, mask_allowed);
 222                 return false;
 223         }
 224
 225         return true;
 226 }
 227
 228 static int check_header(struct sk_buff *skb, int len)
 229 {
 230         if (unlikely(skb->len < len))
 231                 return -EINVAL;
 232         if (unlikely(!pskb_may_pull(skb, len)))
 233                 return -ENOMEM;
 234         return 0;
 235 }
 236
 237 static bool arphdr_ok(struct sk_buff *skb)
 238 {
 239         return pskb_may_pull(skb, skb_network_offset(skb) +
 240                                   sizeof(struct arp_eth_header));
 241 }
 242
 243 static int check_iphdr(struct sk_buff *skb)
 244 {
 245         unsigned int nh_ofs = skb_network_offset(skb);
 246         unsigned int ip_len;
 247         int err;
 248
 249         err = check_header(skb, nh_ofs + sizeof(struct iphdr));
 250         if (unlikely(err))
 251                 return err;
 252
 253         ip_len = ip_hdrlen(skb);
 254         if (unlikely(ip_len < sizeof(struct iphdr) ||
 255                      skb->len < nh_ofs + ip_len))
 256                 return -EINVAL;
 257
 258         skb_set_transport_header(skb, nh_ofs + ip_len);
 259         return 0;
 260 }
 261
 262 static bool tcphdr_ok(struct sk_buff *skb)
 263 {
 264         int th_ofs = skb_transport_offset(skb);
 265         int tcp_len;
 266
 267         if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
 268                 return false;
 269
 270         tcp_len = tcp_hdrlen(skb);
 271         if (unlikely(tcp_len < sizeof(struct tcphdr) ||
 272                      skb->len < th_ofs + tcp_len))
 273                 return false;
 274
 275         return true;
 276 }
 277
 278 static bool udphdr_ok(struct sk_buff *skb)
 279 {
 280         return pskb_may_pull(skb, skb_transport_offset(skb) +
 281                                   sizeof(struct udphdr));
 282 }
 283
 284 static bool icmphdr_ok(struct sk_buff *skb)
 285 {
 286         return pskb_may_pull(skb, skb_transport_offset(skb) +
 287                                   sizeof(struct icmphdr));
 288 }
 289
 290 u64 ovs_flow_used_time(unsigned long flow_jiffies)
 291 {
 292         struct timespec cur_ts;
 293         u64 cur_ms, idle_ms;
 294
 295         ktime_get_ts(&cur_ts);
 296         idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
 297         cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
 298                  cur_ts.tv_nsec / NSEC_PER_MSEC;
 299
 300         return cur_ms - idle_ms;
 301 }
 302
 303 static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
 304 {
 305         unsigned int nh_ofs = skb_network_offset(skb);
 306         unsigned int nh_len;
 307         int payload_ofs;
 308         struct ipv6hdr *nh;
 309         uint8_t nexthdr;
 310         __be16 frag_off;
 311         int err;
 312
 313         err = check_header(skb, nh_ofs + sizeof(*nh));
 314         if (unlikely(err))
 315                 return err;
 316
 317         nh = ipv6_hdr(skb);
 318         nexthdr = nh->nexthdr;
 319         payload_ofs = (u8 *)(nh + 1) - skb->data;
 320
 321         key->ip.proto = NEXTHDR_NONE;
 322         key->ip.tos = ipv6_get_dsfield(nh);
 323         key->ip.ttl = nh->hop_limit;
 324         key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
 325         key->ipv6.addr.src = nh->saddr;
 326         key->ipv6.addr.dst = nh->daddr;
 327
 328         payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
 329         if (unlikely(payload_ofs < 0))
 330                 return -EINVAL;
 331
 332         if (frag_off) {
 333                 if (frag_off & htons(~0x7))
 334                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 335                 else
 336                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 337         }
 338
 339         nh_len = payload_ofs - nh_ofs;
 340         skb_set_transport_header(skb, nh_ofs + nh_len);
 341         key->ip.proto = nexthdr;
 342         return nh_len;
 343 }
 344
 345 static bool icmp6hdr_ok(struct sk_buff *skb)
 346 {
 347         return pskb_may_pull(skb, skb_transport_offset(skb) +
 348                                   sizeof(struct icmp6hdr));
 349 }
 350
 351 void ovs_flow_key_mask(struct sw_flow_key *dst, const struct sw_flow_key *src,
 352                        const struct sw_flow_mask *mask)
 353 {
 354         u8 *m = (u8 *)&mask->key + mask->range.start;
 355         u8 *s = (u8 *)src + mask->range.start;
 356         u8 *d = (u8 *)dst + mask->range.start;
 357         int i;
 358
 359         memset(dst, 0, sizeof(*dst));
 360         for (i = 0; i < ovs_sw_flow_mask_size_roundup(mask); i++) {
 361                 *d = *s & *m;
 362                 d++, s++, m++;
 363         }
 364 }
 365
 366 #define TCP_FLAGS_OFFSET 13
 367 #define TCP_FLAG_MASK 0x3f
 368
 369 void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb)
 370 {
 371         u8 tcp_flags = 0;
 372
 373         if ((flow->key.eth.type == htons(ETH_P_IP) ||
 374              flow->key.eth.type == htons(ETH_P_IPV6)) &&
 375             flow->key.ip.proto == IPPROTO_TCP &&
 376             likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) {
 377                 u8 *tcp = (u8 *)tcp_hdr(skb);
 378                 tcp_flags = *(tcp + TCP_FLAGS_OFFSET) & TCP_FLAG_MASK;
 379         }
 380
 381         spin_lock(&flow->lock);
 382         flow->used = jiffies;
 383         flow->packet_count++;
 384         flow->byte_count += skb->len;
 385         flow->tcp_flags |= tcp_flags;
 386         spin_unlock(&flow->lock);
 387 }
 388
 389 struct sw_flow_actions *ovs_flow_actions_alloc(int size)
 390 {
 391         struct sw_flow_actions *sfa;
 392
 393         if (size > MAX_ACTIONS_BUFSIZE)
 394                 return ERR_PTR(-EINVAL);
 395
 396         sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
 397         if (!sfa)
 398                 return ERR_PTR(-ENOMEM);
 399
 400         sfa->actions_len = 0;
 401         return sfa;
 402 }
 403
 404 struct sw_flow *ovs_flow_alloc(void)
 405 {
 406         struct sw_flow *flow;
 407
 408         flow = kmem_cache_alloc(flow_cache, GFP_KERNEL);
 409         if (!flow)
 410                 return ERR_PTR(-ENOMEM);
 411
 412         spin_lock_init(&flow->lock);
 413         flow->sf_acts = NULL;
 414         flow->mask = NULL;
 415
 416         return flow;
 417 }
 418
 419 static struct hlist_head *find_bucket(struct flow_table *table, u32 hash)
 420 {
 421         hash = jhash_1word(hash, table->hash_seed);
 422         return flex_array_get(table->buckets,
 423                                 (hash & (table->n_buckets - 1)));
 424 }
 425
 426 static struct flex_array *alloc_buckets(unsigned int n_buckets)
 427 {
 428         struct flex_array *buckets;
 429         int i, err;
 430
 431         buckets = flex_array_alloc(sizeof(struct hlist_head *),
 432                                    n_buckets, GFP_KERNEL);
 433         if (!buckets)
 434                 return NULL;
 435
 436         err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL);
 437         if (err) {
 438                 flex_array_free(buckets);
 439                 return NULL;
 440         }
 441
 442         for (i = 0; i < n_buckets; i++)
 443                 INIT_HLIST_HEAD((struct hlist_head *)
 444                                         flex_array_get(buckets, i));
 445
 446         return buckets;
 447 }
 448
 449 static void free_buckets(struct flex_array *buckets)
 450 {
 451         flex_array_free(buckets);
 452 }
 453
 454 static struct flow_table *__flow_tbl_alloc(int new_size)
 455 {
 456         struct flow_table *table = kmalloc(sizeof(*table), GFP_KERNEL);
 457
 458         if (!table)
 459                 return NULL;
 460
 461         table->buckets = alloc_buckets(new_size);
 462
 463         if (!table->buckets) {
 464                 kfree(table);
 465                 return NULL;
 466         }
 467         table->n_buckets = new_size;
 468         table->count = 0;
 469         table->node_ver = 0;
 470         table->keep_flows = false;
 471         get_random_bytes(&table->hash_seed, sizeof(u32));
 472         table->mask_list = NULL;
 473
 474         return table;
 475 }
 476
 477 static void __flow_tbl_destroy(struct flow_table *table)
 478 {
 479         int i;
 480
 481         if (table->keep_flows)
 482                 goto skip_flows;
 483
 484         for (i = 0; i < table->n_buckets; i++) {
 485                 struct sw_flow *flow;
 486                 struct hlist_head *head = flex_array_get(table->buckets, i);
 487                 struct hlist_node *n;
 488                 int ver = table->node_ver;
 489
 490                 hlist_for_each_entry_safe(flow, n, head, hash_node[ver]) {
 491                         hlist_del_rcu(&flow->hash_node[ver]);
 492                         ovs_flow_free(flow, false);
 493                 }
 494         }
 495
 496         BUG_ON(!list_empty(table->mask_list));
 497         kfree(table->mask_list);
 498
 499 skip_flows:
 500         free_buckets(table->buckets);
 501         kfree(table);
 502 }
 503
 504 struct flow_table *ovs_flow_tbl_alloc(int new_size)
 505 {
 506         struct flow_table *table = __flow_tbl_alloc(new_size);
 507
 508         if (!table)
 509                 return NULL;
 510
 511         table->mask_list = kmalloc(sizeof(struct list_head), GFP_KERNEL);
 512         if (!table->mask_list) {
 513                 table->keep_flows = true;
 514                 __flow_tbl_destroy(table);
 515                 return NULL;
 516         }
 517         INIT_LIST_HEAD(table->mask_list);
 518
 519         return table;
 520 }
 521
 522 static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu)
 523 {
 524         struct flow_table *table = container_of(rcu, struct flow_table, rcu);
 525
 526         __flow_tbl_destroy(table);
 527 }
 528
 529 void ovs_flow_tbl_destroy(struct flow_table *table, bool deferred)
 530 {
 531         if (!table)
 532                 return;
 533
 534         if (deferred)
 535                 call_rcu(&table->rcu, flow_tbl_destroy_rcu_cb);
 536         else
 537                 __flow_tbl_destroy(table);
 538 }
 539
 540 struct sw_flow *ovs_flow_dump_next(struct flow_table *table, u32 *bucket, u32 *last)
 541 {
 542         struct sw_flow *flow;
 543         struct hlist_head *head;
 544         int ver;
 545         int i;
 546
 547         ver = table->node_ver;
 548         while (*bucket < table->n_buckets) {
 549                 i = 0;
 550                 head = flex_array_get(table->buckets, *bucket);
 551                 hlist_for_each_entry_rcu(flow, head, hash_node[ver]) {
 552                         if (i < *last) {
 553                                 i++;
 554                                 continue;
 555                         }
 556                         *last = i + 1;
 557                         return flow;
 558                 }
 559                 (*bucket)++;
 560                 *last = 0;
 561         }
 562
 563         return NULL;
 564 }
 565
 566 static void __tbl_insert(struct flow_table *table, struct sw_flow *flow)
 567 {
 568         struct hlist_head *head;
 569
 570         head = find_bucket(table, flow->hash);
 571         hlist_add_head_rcu(&flow->hash_node[table->node_ver], head);
 572
 573         table->count++;
 574 }
 575
 576 static void flow_table_copy_flows(struct flow_table *old, struct flow_table *new)
 577 {
 578         int old_ver;
 579         int i;
 580
 581         old_ver = old->node_ver;
 582         new->node_ver = !old_ver;
 583
 584         /* Insert in new table. */
 585         for (i = 0; i < old->n_buckets; i++) {
 586                 struct sw_flow *flow;
 587                 struct hlist_head *head;
 588
 589                 head = flex_array_get(old->buckets, i);
 590
 591                 hlist_for_each_entry(flow, head, hash_node[old_ver])
 592                         __tbl_insert(new, flow);
 593         }
 594
 595         new->mask_list = old->mask_list;
 596         old->keep_flows = true;
 597 }
 598
 599 static struct flow_table *__flow_tbl_rehash(struct flow_table *table, int n_buckets)
 600 {
 601         struct flow_table *new_table;
 602
 603         new_table = __flow_tbl_alloc(n_buckets);
 604         if (!new_table)
 605                 return ERR_PTR(-ENOMEM);
 606
 607         flow_table_copy_flows(table, new_table);
 608
 609         return new_table;
 610 }
 611
 612 struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table)
 613 {
 614         return __flow_tbl_rehash(table, table->n_buckets);
 615 }
 616
 617 struct flow_table *ovs_flow_tbl_expand(struct flow_table *table)
 618 {
 619         return __flow_tbl_rehash(table, table->n_buckets * 2);
 620 }
 621
 622 static void __flow_free(struct sw_flow *flow)
 623 {
 624         kfree((struct sf_flow_acts __force *)flow->sf_acts);
 625         kmem_cache_free(flow_cache, flow);
 626 }
 627
 628 static void rcu_free_flow_callback(struct rcu_head *rcu)
 629 {
 630         struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu);
 631
 632         __flow_free(flow);
 633 }
 634
 635 void ovs_flow_free(struct sw_flow *flow, bool deferred)
 636 {
 637         if (!flow)
 638                 return;
 639
 640         ovs_sw_flow_mask_del_ref(flow->mask, deferred);
 641
 642         if (deferred)
 643                 call_rcu(&flow->rcu, rcu_free_flow_callback);
 644         else
 645                 __flow_free(flow);
 646 }
 647
 648 /* RCU callback used by ovs_flow_deferred_free_acts. */
 649 static void rcu_free_acts_callback(struct rcu_head *rcu)
 650 {
 651         struct sw_flow_actions *sf_acts = container_of(rcu,
 652                         struct sw_flow_actions, rcu);
 653         kfree(sf_acts);
 654 }
 655
 656 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
 657  * The caller must hold rcu_read_lock for this to be sensible. */
 658 void ovs_flow_deferred_free_acts(struct sw_flow_actions *sf_acts)
 659 {
 660         call_rcu(&sf_acts->rcu, rcu_free_acts_callback);
 661 }
 662
 663 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
 664 {
 665         struct qtag_prefix {
 666                 __be16 eth_type; /* ETH_P_8021Q */
 667                 __be16 tci;
 668         };
 669         struct qtag_prefix *qp;
 670
 671         if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
 672                 return 0;
 673
 674         if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
 675                                          sizeof(__be16))))
 676                 return -ENOMEM;
 677
 678         qp = (struct qtag_prefix *) skb->data;
 679         key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
 680         __skb_pull(skb, sizeof(struct qtag_prefix));
 681
 682         return 0;
 683 }
 684
 685 static __be16 parse_ethertype(struct sk_buff *skb)
 686 {
 687         struct llc_snap_hdr {
 688                 u8  dsap;  /* Always 0xAA */
 689                 u8  ssap;  /* Always 0xAA */
 690                 u8  ctrl;
 691                 u8  oui[3];
 692                 __be16 ethertype;
 693         };
 694         struct llc_snap_hdr *llc;
 695         __be16 proto;
 696
 697         proto = *(__be16 *) skb->data;
 698         __skb_pull(skb, sizeof(__be16));
 699
 700         if (ntohs(proto) >= ETH_P_802_3_MIN)
 701                 return proto;
 702
 703         if (skb->len < sizeof(struct llc_snap_hdr))
 704                 return htons(ETH_P_802_2);
 705
 706         if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
 707                 return htons(0);
 708
 709         llc = (struct llc_snap_hdr *) skb->data;
 710         if (llc->dsap != LLC_SAP_SNAP ||
 711             llc->ssap != LLC_SAP_SNAP ||
 712             (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
 713                 return htons(ETH_P_802_2);
 714
 715         __skb_pull(skb, sizeof(struct llc_snap_hdr));
 716
 717         if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
 718                 return llc->ethertype;
 719
 720         return htons(ETH_P_802_2);
 721 }
 722
 723 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
 724                         int nh_len)
 725 {
 726         struct icmp6hdr *icmp = icmp6_hdr(skb);
 727
 728         /* The ICMPv6 type and code fields use the 16-bit transport port
 729          * fields, so we need to store them in 16-bit network byte order.
 730          */
 731         key->ipv6.tp.src = htons(icmp->icmp6_type);
 732         key->ipv6.tp.dst = htons(icmp->icmp6_code);
 733
 734         if (icmp->icmp6_code == 0 &&
 735             (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
 736              icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 737                 int icmp_len = skb->len - skb_transport_offset(skb);
 738                 struct nd_msg *nd;
 739                 int offset;
 740
 741                 /* In order to process neighbor discovery options, we need the
 742                  * entire packet.
 743                  */
 744                 if (unlikely(icmp_len < sizeof(*nd)))
 745                         return 0;
 746
 747                 if (unlikely(skb_linearize(skb)))
 748                         return -ENOMEM;
 749
 750                 nd = (struct nd_msg *)skb_transport_header(skb);
 751                 key->ipv6.nd.target = nd->target;
 752
 753                 icmp_len -= sizeof(*nd);
 754                 offset = 0;
 755                 while (icmp_len >= 8) {
 756                         struct nd_opt_hdr *nd_opt =
 757                                  (struct nd_opt_hdr *)(nd->opt + offset);
 758                         int opt_len = nd_opt->nd_opt_len * 8;
 759
 760                         if (unlikely(!opt_len || opt_len > icmp_len))
 761                                 return 0;
 762
 763                         /* Store the link layer address if the appropriate
 764                          * option is provided.  It is considered an error if
 765                          * the same link layer option is specified twice.
 766                          */
 767                         if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
 768                             && opt_len == 8) {
 769                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
 770                                         goto invalid;
 771                                 memcpy(key->ipv6.nd.sll,
 772                                     &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
 773                         } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
 774                                    && opt_len == 8) {
 775                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
 776                                         goto invalid;
 777                                 memcpy(key->ipv6.nd.tll,
 778                                     &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
 779                         }
 780
 781                         icmp_len -= opt_len;
 782                         offset += opt_len;
 783                 }
 784         }
 785
 786         return 0;
 787
 788 invalid:
 789         memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
 790         memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
 791         memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
 792
 793         return 0;
 794 }
 795
 796 /**
 797  * ovs_flow_extract - extracts a flow key from an Ethernet frame.
 798  * @skb: sk_buff that contains the frame, with skb->data pointing to the
 799  * Ethernet header
 800  * @in_port: port number on which @skb was received.
 801  * @key: output flow key
 802  * @key_lenp: length of output flow key
 803  *
 804  * The caller must ensure that skb->len >= ETH_HLEN.
 805  *
 806  * Returns 0 if successful, otherwise a negative errno value.
 807  *
 808  * Initializes @skb header pointers as follows:
 809  *
 810  *    - skb->mac_header: the Ethernet header.
 811  *
 812  *    - skb->network_header: just past the Ethernet header, or just past the
 813  *      VLAN header, to the first byte of the Ethernet payload.
 814  *
 815  *    - skb->transport_header: If key->dl_type is ETH_P_IP or ETH_P_IPV6
 816  *      on output, then just past the IP header, if one is present and
 817  *      of a correct length, otherwise the same as skb->network_header.
 818  *      For other key->dl_type values it is left untouched.
 819  */
 820 int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
 821 {
 822         int error;
 823         struct ethhdr *eth;
 824
 825         memset(key, 0, sizeof(*key));
 826
 827         key->phy.priority = skb->priority;
 828         if (OVS_CB(skb)->tun_key)
 829                 memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key));
 830         key->phy.in_port = in_port;
 831         key->phy.skb_mark = skb_get_mark(skb);
 832
 833         skb_reset_mac_header(skb);
 834
 835         /* Link layer.  We are guaranteed to have at least the 14 byte Ethernet
 836          * header in the linear data area.
 837          */
 838         eth = eth_hdr(skb);
 839         memcpy(key->eth.src, eth->h_source, ETH_ALEN);
 840         memcpy(key->eth.dst, eth->h_dest, ETH_ALEN);
 841
 842         __skb_pull(skb, 2 * ETH_ALEN);
 843
 844         if (vlan_tx_tag_present(skb))
 845                 key->eth.tci = htons(vlan_get_tci(skb));
 846         else if (eth->h_proto == htons(ETH_P_8021Q))
 847                 if (unlikely(parse_vlan(skb, key)))
 848                         return -ENOMEM;
 849
 850         key->eth.type = parse_ethertype(skb);
 851         if (unlikely(key->eth.type == htons(0)))
 852                 return -ENOMEM;
 853
 854         skb_reset_network_header(skb);
 855         __skb_push(skb, skb->data - skb_mac_header(skb));
 856
 857         /* Network layer. */
 858         if (key->eth.type == htons(ETH_P_IP)) {
 859                 struct iphdr *nh;
 860                 __be16 offset;
 861
 862                 error = check_iphdr(skb);
 863                 if (unlikely(error)) {
 864                         if (error == -EINVAL) {
 865                                 skb->transport_header = skb->network_header;
 866                                 error = 0;
 867                         }
 868                         return error;
 869                 }
 870
 871                 nh = ip_hdr(skb);
 872                 key->ipv4.addr.src = nh->saddr;
 873                 key->ipv4.addr.dst = nh->daddr;
 874
 875                 key->ip.proto = nh->protocol;
 876                 key->ip.tos = nh->tos;
 877                 key->ip.ttl = nh->ttl;
 878
 879                 offset = nh->frag_off & htons(IP_OFFSET);
 880                 if (offset) {
 881                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 882                         return 0;
 883                 }
 884                 if (nh->frag_off & htons(IP_MF) ||
 885                          skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 886                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 887
 888                 /* Transport layer. */
 889                 if (key->ip.proto == IPPROTO_TCP) {
 890                         if (tcphdr_ok(skb)) {
 891                                 struct tcphdr *tcp = tcp_hdr(skb);
 892                                 key->ipv4.tp.src = tcp->source;
 893                                 key->ipv4.tp.dst = tcp->dest;
 894                         }
 895                 } else if (key->ip.proto == IPPROTO_UDP) {
 896                         if (udphdr_ok(skb)) {
 897                                 struct udphdr *udp = udp_hdr(skb);
 898                                 key->ipv4.tp.src = udp->source;
 899                                 key->ipv4.tp.dst = udp->dest;
 900                         }
 901                 } else if (key->ip.proto == IPPROTO_ICMP) {
 902                         if (icmphdr_ok(skb)) {
 903                                 struct icmphdr *icmp = icmp_hdr(skb);
 904                                 /* The ICMP type and code fields use the 16-bit
 905                                  * transport port fields, so we need to store
 906                                  * them in 16-bit network byte order. */
 907                                 key->ipv4.tp.src = htons(icmp->type);
 908                                 key->ipv4.tp.dst = htons(icmp->code);
 909                         }
 910                 }
 911
 912         } else if ((key->eth.type == htons(ETH_P_ARP) ||
 913                    key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) {
 914                 struct arp_eth_header *arp;
 915
 916                 arp = (struct arp_eth_header *)skb_network_header(skb);
 917
 918                 if (arp->ar_hrd == htons(ARPHRD_ETHER)
 919                                 && arp->ar_pro == htons(ETH_P_IP)
 920                                 && arp->ar_hln == ETH_ALEN
 921                                 && arp->ar_pln == 4) {
 922
 923                         /* We only match on the lower 8 bits of the opcode. */
 924                         if (ntohs(arp->ar_op) <= 0xff)
 925                                 key->ip.proto = ntohs(arp->ar_op);
 926                         memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
 927                         memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
 928                         memcpy(key->ipv4.arp.sha, arp->ar_sha, ETH_ALEN);
 929                         memcpy(key->ipv4.arp.tha, arp->ar_tha, ETH_ALEN);
 930                 }
 931         } else if (key->eth.type == htons(ETH_P_IPV6)) {
 932                 int nh_len;             /* IPv6 Header + Extensions */
 933
 934                 nh_len = parse_ipv6hdr(skb, key);
 935                 if (unlikely(nh_len < 0)) {
 936                         if (nh_len == -EINVAL) {
 937                                 skb->transport_header = skb->network_header;
 938                                 error = 0;
 939                         } else {
 940                                 error = nh_len;
 941                         }
 942                         return error;
 943                 }
 944
 945                 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
 946                         return 0;
 947                 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 948                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 949
 950                 /* Transport layer. */
 951                 if (key->ip.proto == NEXTHDR_TCP) {
 952                         if (tcphdr_ok(skb)) {
 953                                 struct tcphdr *tcp = tcp_hdr(skb);
 954                                 key->ipv6.tp.src = tcp->source;
 955                                 key->ipv6.tp.dst = tcp->dest;
 956                         }
 957                 } else if (key->ip.proto == NEXTHDR_UDP) {
 958                         if (udphdr_ok(skb)) {
 959                                 struct udphdr *udp = udp_hdr(skb);
 960                                 key->ipv6.tp.src = udp->source;
 961                                 key->ipv6.tp.dst = udp->dest;
 962                         }
 963                 } else if (key->ip.proto == NEXTHDR_ICMP) {
 964                         if (icmp6hdr_ok(skb)) {
 965                                 error = parse_icmpv6(skb, key, nh_len);
 966                                 if (error)
 967                                         return error;
 968                         }
 969                 }
 970         }
 971
 972         return 0;
 973 }
 974
 975 static u32 ovs_flow_hash(const struct sw_flow_key *key, int key_start, int key_len)
 976 {
 977         return jhash2((u32 *)((u8 *)key + key_start),
 978                       DIV_ROUND_UP(key_len - key_start, sizeof(u32)), 0);
 979 }
 980
 981 static int flow_key_start(const struct sw_flow_key *key)
 982 {
 983         if (key->tun_key.ipv4_dst)
 984                 return 0;
 985         else
 986                 return offsetof(struct sw_flow_key, phy);
 987 }
 988
 989 static bool __cmp_key(const struct sw_flow_key *key1,
 990                 const struct sw_flow_key *key2,  int key_start, int key_len)
 991 {
 992         return !memcmp((u8 *)key1 + key_start,
 993                         (u8 *)key2 + key_start, (key_len - key_start));
 994 }
 995
 996 static bool __flow_cmp_key(const struct sw_flow *flow,
 997                 const struct sw_flow_key *key, int key_start, int key_len)
 998 {
 999         return __cmp_key(&flow->key, key, key_start, key_len);
1000 }
1001
1002 static bool __flow_cmp_unmasked_key(const struct sw_flow *flow,
1003                   const struct sw_flow_key *key, int key_start, int key_len)
1004 {
1005         return __cmp_key(&flow->unmasked_key, key, key_start, key_len);
1006 }
1007
1008 bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
1009                 const struct sw_flow_key *key, int key_len)
1010 {
1011         int key_start;
1012         key_start = flow_key_start(key);
1013
1014         return __flow_cmp_unmasked_key(flow, key, key_start, key_len);
1015
1016 }
1017
1018 struct sw_flow *ovs_flow_lookup_unmasked_key(struct flow_table *table,
1019                                        struct sw_flow_match *match)
1020 {
1021         struct sw_flow_key *unmasked = match->key;
1022         int key_len = match->range.end;
1023         struct sw_flow *flow;
1024
1025         flow = ovs_flow_lookup(table, unmasked);
1026         if (flow && (!ovs_flow_cmp_unmasked_key(flow, unmasked, key_len)))
1027                 flow = NULL;
1028
1029         return flow;
1030 }
1031
1032 static struct sw_flow *ovs_masked_flow_lookup(struct flow_table *table,
1033                                     const struct sw_flow_key *flow_key,
1034                                     struct sw_flow_mask *mask)
1035 {
1036         struct sw_flow *flow;
1037         struct hlist_head *head;
1038         int key_start = mask->range.start;
1039         int key_len = mask->range.end;
1040         u32 hash;
1041         struct sw_flow_key masked_key;
1042
1043         ovs_flow_key_mask(&masked_key, flow_key, mask);
1044         hash = ovs_flow_hash(&masked_key, key_start, key_len);
1045         head = find_bucket(table, hash);
1046         hlist_for_each_entry_rcu(flow, head, hash_node[table->node_ver]) {
1047                 if (flow->mask == mask &&
1048                     __flow_cmp_key(flow, &masked_key, key_start, key_len))
1049                         return flow;
1050         }
1051         return NULL;
1052 }
1053
1054 struct sw_flow *ovs_flow_lookup(struct flow_table *tbl,
1055                                 const struct sw_flow_key *key)
1056 {
1057         struct sw_flow *flow = NULL;
1058         struct sw_flow_mask *mask;
1059
1060         list_for_each_entry_rcu(mask, tbl->mask_list, list) {
1061                 flow = ovs_masked_flow_lookup(tbl, key, mask);
1062                 if (flow)  /* Found */
1063                         break;
1064         }
1065
1066         return flow;
1067 }
1068
1069
1070 void ovs_flow_insert(struct flow_table *table, struct sw_flow *flow)
1071 {
1072         flow->hash = ovs_flow_hash(&flow->key, flow->mask->range.start,
1073                         flow->mask->range.end);
1074         __tbl_insert(table, flow);
1075 }
1076
1077 void ovs_flow_remove(struct flow_table *table, struct sw_flow *flow)
1078 {
1079         BUG_ON(table->count == 0);
1080         hlist_del_rcu(&flow->hash_node[table->node_ver]);
1081         table->count--;
1082 }
1083
1084 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
1085 const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
1086         [OVS_KEY_ATTR_ENCAP] = -1,
1087         [OVS_KEY_ATTR_PRIORITY] = sizeof(u32),
1088         [OVS_KEY_ATTR_IN_PORT] = sizeof(u32),
1089         [OVS_KEY_ATTR_SKB_MARK] = sizeof(u32),
1090         [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet),
1091         [OVS_KEY_ATTR_VLAN] = sizeof(__be16),
1092         [OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16),
1093         [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
1094         [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
1095         [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
1096         [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
1097         [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
1098         [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
1099         [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
1100         [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
1101         [OVS_KEY_ATTR_TUNNEL] = -1,
1102 };
1103
1104 static bool is_all_zero(const u8 *fp, size_t size)
1105 {
1106         int i;
1107
1108         if (!fp)
1109                 return false;
1110
1111         for (i = 0; i < size; i++)
1112                 if (fp[i])
1113                         return false;
1114
1115         return true;
1116 }
1117
1118 static int __parse_flow_nlattrs(const struct nlattr *attr,
1119                               const struct nlattr *a[],
1120                               u64 *attrsp, bool nz)
1121 {
1122         const struct nlattr *nla;
1123         u64 attrs;
1124         int rem;
1125
1126         attrs = *attrsp;
1127         nla_for_each_nested(nla, attr, rem) {
1128                 u16 type = nla_type(nla);
1129                 int expected_len;
1130
1131                 if (type > OVS_KEY_ATTR_MAX) {
1132                         OVS_NLERR("Unknown key attribute (type=%d, max=%d).\n",
1133                                   type, OVS_KEY_ATTR_MAX);
1134                 }
1135
1136                 if (attrs & (1ULL << type)) {
1137                         OVS_NLERR("Duplicate key attribute (type %d).\n", type);
1138                         return -EINVAL;
1139                 }
1140
1141                 expected_len = ovs_key_lens[type];
1142                 if (nla_len(nla) != expected_len && expected_len != -1) {
1143                         OVS_NLERR("Key attribute has unexpected length (type=%d"
1144                                   ", length=%d, expected=%d).\n", type,
1145                                   nla_len(nla), expected_len);
1146                         return -EINVAL;
1147                 }
1148
1149                 if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
1150                         attrs |= 1ULL << type;
1151                         a[type] = nla;
1152                 }
1153         }
1154         if (rem) {
1155                 OVS_NLERR("Message has %d unknown bytes.\n", rem);
1156                 return -EINVAL;
1157         }
1158
1159         *attrsp = attrs;
1160         return 0;
1161 }
1162
1163 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
1164                               const struct nlattr *a[], u64 *attrsp)
1165 {
1166         return __parse_flow_nlattrs(attr, a, attrsp, true);
1167 }
1168
1169 static int parse_flow_nlattrs(const struct nlattr *attr,
1170                               const struct nlattr *a[], u64 *attrsp)
1171 {
1172         return __parse_flow_nlattrs(attr, a, attrsp, false);
1173 }
1174
1175 int ipv4_tun_from_nlattr(const struct nlattr *attr,
1176                          struct sw_flow_match *match, bool is_mask)
1177 {
1178         struct nlattr *a;
1179         int rem;
1180         bool ttl = false;
1181         u16 tun_flags = 0;
1182
1183         nla_for_each_nested(a, attr, rem) {
1184                 int type = nla_type(a);
1185                 static const u32 ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
1186                         [OVS_TUNNEL_KEY_ATTR_ID] = sizeof(u64),
1187                         [OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = sizeof(u32),
1188                         [OVS_TUNNEL_KEY_ATTR_IPV4_DST] = sizeof(u32),
1189                         [OVS_TUNNEL_KEY_ATTR_TOS] = 1,
1190                         [OVS_TUNNEL_KEY_ATTR_TTL] = 1,
1191                         [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = 0,
1192                         [OVS_TUNNEL_KEY_ATTR_CSUM] = 0,
1193                 };
1194
1195                 if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
1196                         OVS_NLERR("Unknown IPv4 tunnel attribute (type=%d, max=%d).\n",
1197                         type, OVS_TUNNEL_KEY_ATTR_MAX);
1198                         return -EINVAL;
1199                 }
1200
1201                 if (ovs_tunnel_key_lens[type] != nla_len(a)) {
1202                         OVS_NLERR("IPv4 tunnel attribute type has unexpected "
1203                                   " legnth (type=%d, length=%d, expected=%d).\n",
1204                                   type, nla_len(a), ovs_tunnel_key_lens[type]);
1205                         return -EINVAL;
1206                 }
1207
1208                 switch (type) {
1209                 case OVS_TUNNEL_KEY_ATTR_ID:
1210                         SW_FLOW_KEY_PUT(match, tun_key.tun_id,
1211                                         nla_get_be64(a), is_mask);
1212                         tun_flags |= OVS_TNL_F_KEY;
1213                         break;
1214                 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
1215                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_src,
1216                                         nla_get_be32(a), is_mask);
1217                         break;
1218                 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
1219                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst,
1220                                         nla_get_be32(a), is_mask);
1221                         break;
1222                 case OVS_TUNNEL_KEY_ATTR_TOS:
1223                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos,
1224                                         nla_get_u8(a), is_mask);
1225                         break;
1226                 case OVS_TUNNEL_KEY_ATTR_TTL:
1227                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_ttl,
1228                                         nla_get_u8(a), is_mask);
1229                         ttl = true;
1230                         break;
1231                 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
1232                         tun_flags |= OVS_TNL_F_DONT_FRAGMENT;
1233                         break;
1234                 case OVS_TUNNEL_KEY_ATTR_CSUM:
1235                         tun_flags |= OVS_TNL_F_CSUM;
1236                         break;
1237                 default:
1238                         return -EINVAL;
1239                 }
1240         }
1241
1242         SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
1243
1244         if (rem > 0) {
1245                 OVS_NLERR("IPv4 tunnel attribute has %d unknown bytes.\n", rem);
1246                 return -EINVAL;
1247         }
1248
1249         if (!match->key->tun_key.ipv4_dst) {
1250                 OVS_NLERR("IPv4 tunnel destination address is zero.\n");
1251                 return -EINVAL;
1252         }
1253
1254         if (!ttl) {
1255                 OVS_NLERR("IPv4 tunnel TTL not specified.\n");
1256                 return -EINVAL;
1257         }
1258
1259         return 0;
1260 }
1261
1262 int ipv4_tun_to_nlattr(struct sk_buff *skb,
1263                         const struct ovs_key_ipv4_tunnel *tun_key,
1264                         const struct ovs_key_ipv4_tunnel *output)
1265 {
1266         struct nlattr *nla;
1267
1268         nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
1269         if (!nla)
1270                 return -EMSGSIZE;
1271
1272         if (output->tun_flags & OVS_TNL_F_KEY &&
1273             nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id))
1274                 return -EMSGSIZE;
1275         if (output->ipv4_src &&
1276                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src))
1277                 return -EMSGSIZE;
1278         if (output->ipv4_dst &&
1279                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst))
1280                 return -EMSGSIZE;
1281         if (output->ipv4_tos &&
1282                 nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->ipv4_tos))
1283                 return -EMSGSIZE;
1284         if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl))
1285                 return -EMSGSIZE;
1286         if ((output->tun_flags & OVS_TNL_F_DONT_FRAGMENT) &&
1287                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
1288                 return -EMSGSIZE;
1289         if ((output->tun_flags & OVS_TNL_F_CSUM) &&
1290                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
1291                 return -EMSGSIZE;
1292
1293         nla_nest_end(skb, nla);
1294         return 0;
1295 }
1296
1297
1298 static int metadata_from_nlattrs(struct sw_flow_match *match,  u64 *attrs,
1299                 const struct nlattr **a, bool is_mask)
1300 {
1301         if (*attrs & (1ULL << OVS_KEY_ATTR_PRIORITY)) {
1302                 SW_FLOW_KEY_PUT(match, phy.priority,
1303                           nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
1304                 *attrs &= ~(1ULL << OVS_KEY_ATTR_PRIORITY);
1305         }
1306
1307         if (*attrs & (1ULL << OVS_KEY_ATTR_IN_PORT)) {
1308                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
1309
1310                 if (is_mask)
1311                         in_port = 0xffffffff; /* Always exact match in_port. */
1312                 else if (in_port >= DP_MAX_PORTS)
1313                         return -EINVAL;
1314
1315                 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
1316                 *attrs &= ~(1ULL << OVS_KEY_ATTR_IN_PORT);
1317         } else if (!is_mask) {
1318                 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
1319         }
1320
1321         if (*attrs & (1ULL << OVS_KEY_ATTR_SKB_MARK)) {
1322                 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
1323 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20) && !defined(CONFIG_NETFILTER)
1324                 if (!is_mask && mark != 0) {
1325                         OVS_NLERR("skb->mark must be zero on this kernel (mark=%d).\n", mark);
1326                         return -EINVAL;
1327                 }
1328 #endif
1329                 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
1330                 *attrs &= ~(1ULL << OVS_KEY_ATTR_SKB_MARK);
1331         }
1332         if (*attrs & (1ULL << OVS_KEY_ATTR_TUNNEL)) {
1333                 if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
1334                                         is_mask))
1335                         return -EINVAL;
1336                 *attrs &= ~(1ULL << OVS_KEY_ATTR_TUNNEL);
1337         }
1338         return 0;
1339 }
1340
1341 static int ovs_key_from_nlattrs(struct sw_flow_match *match,  u64 attrs,
1342                 const struct nlattr **a, bool is_mask)
1343 {
1344         int err;
1345         u64 orig_attrs = attrs;
1346
1347         err = metadata_from_nlattrs(match, &attrs, a, is_mask);
1348         if (err)
1349                 return err;
1350
1351         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) {
1352                 const struct ovs_key_ethernet *eth_key;
1353
1354                 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
1355                 SW_FLOW_KEY_MEMCPY(match, eth.src,
1356                                 eth_key->eth_src, ETH_ALEN, is_mask);
1357                 SW_FLOW_KEY_MEMCPY(match, eth.dst,
1358                                 eth_key->eth_dst, ETH_ALEN, is_mask);
1359                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERNET);
1360         }
1361
1362         if (attrs & (1ULL << OVS_KEY_ATTR_VLAN)) {
1363                 __be16 tci;
1364
1365                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1366                 if (!(tci & htons(VLAN_TAG_PRESENT))) {
1367                         if (is_mask)
1368                                 OVS_NLERR("VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.\n");
1369                         else
1370                                 OVS_NLERR("VLAN TCI does not have VLAN_TAG_PRESENT bit set.\n");
1371
1372                         return -EINVAL;
1373                 }
1374
1375                 SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
1376                 attrs &= ~(1ULL << OVS_KEY_ATTR_VLAN);
1377         } else if (!is_mask)
1378                 SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
1379
1380         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) {
1381                 __be16 eth_type;
1382
1383                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1384                 if (is_mask) {
1385                         /* Always exact match EtherType. */
1386                         eth_type = htons(0xffff);
1387                 } else if (ntohs(eth_type) < ETH_P_802_3_MIN) {
1388                         OVS_NLERR("EtherType is less than mimimum (type=%x, min=%x).\n",
1389                                         ntohs(eth_type), ETH_P_802_3_MIN);
1390                         return -EINVAL;
1391                 }
1392
1393                 SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
1394                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
1395         } else if (!is_mask) {
1396                 SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
1397         }
1398
1399         if (attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
1400                 const struct ovs_key_ipv4 *ipv4_key;
1401
1402                 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
1403                 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
1404                         OVS_NLERR("Unknown IPv4 fragment type (value=%d, max=%d).\n",
1405                                 ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
1406                         return -EINVAL;
1407                 }
1408                 SW_FLOW_KEY_PUT(match, ip.proto,
1409                                 ipv4_key->ipv4_proto, is_mask);
1410                 SW_FLOW_KEY_PUT(match, ip.tos,
1411                                 ipv4_key->ipv4_tos, is_mask);
1412                 SW_FLOW_KEY_PUT(match, ip.ttl,
1413                                 ipv4_key->ipv4_ttl, is_mask);
1414                 SW_FLOW_KEY_PUT(match, ip.frag,
1415                                 ipv4_key->ipv4_frag, is_mask);
1416                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
1417                                 ipv4_key->ipv4_src, is_mask);
1418                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
1419                                 ipv4_key->ipv4_dst, is_mask);
1420                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV4);
1421         }
1422
1423         if (attrs & (1ULL << OVS_KEY_ATTR_IPV6)) {
1424                 const struct ovs_key_ipv6 *ipv6_key;
1425
1426                 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
1427                 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
1428                         OVS_NLERR("Unknown IPv6 fragment type (value=%d, max=%d).\n",
1429                                 ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
1430                         return -EINVAL;
1431                 }
1432                 SW_FLOW_KEY_PUT(match, ipv6.label,
1433                                 ipv6_key->ipv6_label, is_mask);
1434                 SW_FLOW_KEY_PUT(match, ip.proto,
1435                                 ipv6_key->ipv6_proto, is_mask);
1436                 SW_FLOW_KEY_PUT(match, ip.tos,
1437                                 ipv6_key->ipv6_tclass, is_mask);
1438                 SW_FLOW_KEY_PUT(match, ip.ttl,
1439                                 ipv6_key->ipv6_hlimit, is_mask);
1440                 SW_FLOW_KEY_PUT(match, ip.frag,
1441                                 ipv6_key->ipv6_frag, is_mask);
1442                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
1443                                 ipv6_key->ipv6_src,
1444                                 sizeof(match->key->ipv6.addr.src),
1445                                 is_mask);
1446                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
1447                                 ipv6_key->ipv6_dst,
1448                                 sizeof(match->key->ipv6.addr.dst),
1449                                 is_mask);
1450
1451                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV6);
1452         }
1453
1454         if (attrs & (1ULL << OVS_KEY_ATTR_ARP)) {
1455                 const struct ovs_key_arp *arp_key;
1456
1457                 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
1458                 if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
1459                         OVS_NLERR("Unknown ARP opcode (opcode=%d).\n",
1460                                   arp_key->arp_op);
1461                         return -EINVAL;
1462                 }
1463
1464                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
1465                                 arp_key->arp_sip, is_mask);
1466                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
1467                         arp_key->arp_tip, is_mask);
1468                 SW_FLOW_KEY_PUT(match, ip.proto,
1469                                 ntohs(arp_key->arp_op), is_mask);
1470                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
1471                                 arp_key->arp_sha, ETH_ALEN, is_mask);
1472                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
1473                                 arp_key->arp_tha, ETH_ALEN, is_mask);
1474
1475                 attrs &= ~(1ULL << OVS_KEY_ATTR_ARP);
1476         }
1477
1478         if (attrs & (1ULL << OVS_KEY_ATTR_TCP)) {
1479                 const struct ovs_key_tcp *tcp_key;
1480
1481                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
1482                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
1483                         SW_FLOW_KEY_PUT(match, ipv4.tp.src,
1484                                         tcp_key->tcp_src, is_mask);
1485                         SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
1486                                         tcp_key->tcp_dst, is_mask);
1487                 } else {
1488                         SW_FLOW_KEY_PUT(match, ipv6.tp.src,
1489                                         tcp_key->tcp_src, is_mask);
1490                         SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
1491                                         tcp_key->tcp_dst, is_mask);
1492                 }
1493                 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP);
1494         }
1495
1496         if (attrs & (1ULL << OVS_KEY_ATTR_UDP)) {
1497                 const struct ovs_key_udp *udp_key;
1498
1499                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
1500                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
1501                         SW_FLOW_KEY_PUT(match, ipv4.tp.src,
1502                                         udp_key->udp_src, is_mask);
1503                         SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
1504                                         udp_key->udp_dst, is_mask);
1505                 } else {
1506                         SW_FLOW_KEY_PUT(match, ipv6.tp.src,
1507                                         udp_key->udp_src, is_mask);
1508                         SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
1509                                         udp_key->udp_dst, is_mask);
1510                 }
1511                 attrs &= ~(1ULL << OVS_KEY_ATTR_UDP);
1512         }
1513
1514         if (attrs & (1ULL << OVS_KEY_ATTR_ICMP)) {
1515                 const struct ovs_key_icmp *icmp_key;
1516
1517                 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
1518                 SW_FLOW_KEY_PUT(match, ipv4.tp.src,
1519                                 htons(icmp_key->icmp_type), is_mask);
1520                 SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
1521                                 htons(icmp_key->icmp_code), is_mask);
1522                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMP);
1523         }
1524
1525         if (attrs & (1ULL << OVS_KEY_ATTR_ICMPV6)) {
1526                 const struct ovs_key_icmpv6 *icmpv6_key;
1527
1528                 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
1529                 SW_FLOW_KEY_PUT(match, ipv6.tp.src,
1530                                 htons(icmpv6_key->icmpv6_type), is_mask);
1531                 SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
1532                                 htons(icmpv6_key->icmpv6_code), is_mask);
1533                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMPV6);
1534         }
1535
1536         if (attrs & (1ULL << OVS_KEY_ATTR_ND)) {
1537                 const struct ovs_key_nd *nd_key;
1538
1539                 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
1540                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
1541                         nd_key->nd_target,
1542                         sizeof(match->key->ipv6.nd.target),
1543                         is_mask);
1544                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
1545                         nd_key->nd_sll, ETH_ALEN, is_mask);
1546                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
1547                                 nd_key->nd_tll, ETH_ALEN, is_mask);
1548                 attrs &= ~(1ULL << OVS_KEY_ATTR_ND);
1549         }
1550
1551         if (attrs != 0)
1552                 return -EINVAL;
1553
1554         return 0;
1555 }
1556
1557 /**
1558  * ovs_match_from_nlattrs - parses Netlink attributes into a flow key and
1559  * mask. In case the 'mask' is NULL, the flow is treated as exact match
1560  * flow. Otherwise, it is treated as a wildcarded flow, except the mask
1561  * does not include any don't care bit.
1562  * @match: receives the extracted flow match information.
1563  * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1564  * sequence. The fields should of the packet that triggered the creation
1565  * of this flow.
1566  * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
1567  * attribute specifies the mask field of the wildcarded flow.
1568  */
1569 int ovs_match_from_nlattrs(struct sw_flow_match *match,
1570                            const struct nlattr *key,
1571                            const struct nlattr *mask)
1572 {
1573         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1574         const struct nlattr *encap;
1575         u64 key_attrs = 0;
1576         u64 mask_attrs = 0;
1577         bool encap_valid = false;
1578         int err;
1579
1580         err = parse_flow_nlattrs(key, a, &key_attrs);
1581         if (err)
1582                 return err;
1583
1584         if (key_attrs & 1ULL << OVS_KEY_ATTR_ENCAP) {
1585                 encap = a[OVS_KEY_ATTR_ENCAP];
1586                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
1587                 if (nla_len(encap)) {
1588                         __be16 eth_type = 0; /* ETH_P_8021Q */
1589
1590                         if (a[OVS_KEY_ATTR_ETHERTYPE])
1591                                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1592
1593                         if  ((eth_type == htons(ETH_P_8021Q)) && (a[OVS_KEY_ATTR_VLAN])) {
1594                                 encap_valid = true;
1595                                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
1596                                 err = parse_flow_nlattrs(encap, a, &key_attrs);
1597                         } else {
1598                                 OVS_NLERR("Encap attribute is set for a non-VLAN frame.\n");
1599                                 err = -EINVAL;
1600                         }
1601
1602                         if (err)
1603                                 return err;
1604                 }
1605         }
1606
1607         err = ovs_key_from_nlattrs(match, key_attrs, a, false);
1608         if (err)
1609                 return err;
1610
1611         if (mask) {
1612                 err = parse_flow_mask_nlattrs(mask, a, &mask_attrs);
1613                 if (err)
1614                         return err;
1615
1616                 if ((mask_attrs & 1ULL << OVS_KEY_ATTR_ENCAP) && encap_valid) {
1617                         __be16 eth_type = 0;
1618
1619                         mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
1620                         if (a[OVS_KEY_ATTR_ETHERTYPE])
1621                                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1622                         if (eth_type == htons(0xffff)) {
1623                                 mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
1624                                 encap = a[OVS_KEY_ATTR_ENCAP];
1625                                 err = parse_flow_mask_nlattrs(encap, a, &mask_attrs);
1626                         } else {
1627                                 OVS_NLERR("VLAN frames must have an exact match"
1628                                          " on the TPID (mask=%x).\n",
1629                                          ntohs(eth_type));
1630                                 err = -EINVAL;
1631                         }
1632
1633                         if (err)
1634                                 return err;
1635                 }
1636
1637                 err = ovs_key_from_nlattrs(match, mask_attrs, a, true);
1638                 if (err)
1639                         return err;
1640         } else {
1641                 /* Populate exact match flow's key mask. */
1642                 if (match->mask)
1643                         ovs_sw_flow_mask_set(match->mask, &match->range, 0xff);
1644         }
1645
1646         if (!ovs_match_validate(match, key_attrs, mask_attrs))
1647                 return -EINVAL;
1648
1649         return 0;
1650 }
1651
1652 /**
1653  * ovs_flow_metadata_from_nlattrs - parses Netlink attributes into a flow key.
1654  * @flow: Receives extracted in_port, priority, tun_key and skb_mark.
1655  * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1656  * sequence.
1657  *
1658  * This parses a series of Netlink attributes that form a flow key, which must
1659  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
1660  * get the metadata, that is, the parts of the flow key that cannot be
1661  * extracted from the packet itself.
1662  */
1663
1664 int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow,
1665                 const struct nlattr *attr)
1666 {
1667         struct ovs_key_ipv4_tunnel *tun_key = &flow->key.tun_key;
1668         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1669         u64 attrs = 0;
1670         int err;
1671         struct sw_flow_match match;
1672
1673         flow->key.phy.in_port = DP_MAX_PORTS;
1674         flow->key.phy.priority = 0;
1675         flow->key.phy.skb_mark = 0;
1676         memset(tun_key, 0, sizeof(flow->key.tun_key));
1677
1678         err = parse_flow_nlattrs(attr, a, &attrs);
1679         if (err)
1680                 return -EINVAL;
1681
1682         memset(&match, 0, sizeof(match));
1683         match.key = &flow->key;
1684
1685         err = metadata_from_nlattrs(&match, &attrs, a, false);
1686         if (err)
1687                 return err;
1688
1689         return 0;
1690 }
1691
1692 int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey,
1693                 const struct sw_flow_key *output, struct sk_buff *skb)
1694 {
1695         struct ovs_key_ethernet *eth_key;
1696         struct nlattr *nla, *encap;
1697
1698         if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
1699                 goto nla_put_failure;
1700
1701         if (swkey->tun_key.ipv4_dst &&
1702             ipv4_tun_to_nlattr(skb, &swkey->tun_key, &output->tun_key))
1703                 goto nla_put_failure;
1704
1705         if (swkey->phy.in_port == DP_MAX_PORTS) {
1706                 if ((swkey != output) && (output->phy.in_port == 0xffff))
1707                         if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
1708                                 goto nla_put_failure;
1709         } else {
1710                 u16 upper_u16;
1711                 upper_u16 = (swkey == output) ? 0 : 0xffff;
1712
1713                 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
1714                                 (upper_u16 << 16) | output->phy.in_port))
1715                         goto nla_put_failure;
1716         }
1717
1718         if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
1719                 goto nla_put_failure;
1720
1721         nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
1722         if (!nla)
1723                 goto nla_put_failure;
1724
1725         eth_key = nla_data(nla);
1726         memcpy(eth_key->eth_src, output->eth.src, ETH_ALEN);
1727         memcpy(eth_key->eth_dst, output->eth.dst, ETH_ALEN);
1728
1729         if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
1730                 __be16 eth_type;
1731                 eth_type = (swkey == output) ? htons(ETH_P_8021Q) : htons(0xffff) ;
1732                 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
1733                     nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
1734                         goto nla_put_failure;
1735                 encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
1736                 if (!swkey->eth.tci)
1737                         goto unencap;
1738         } else
1739                 encap = NULL;
1740
1741         if (swkey->eth.type == htons(ETH_P_802_2)) {
1742                 /*
1743                  * Ethertype 802.2 is represented in the netlink with omitted
1744                  * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
1745                  * 0xffff in the mask attribute.  Ethertype can also
1746                  * be wildcarded.
1747                  */
1748                 if (swkey != output && output->eth.type)
1749                         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
1750                                                 output->eth.type))
1751                                 goto nla_put_failure;
1752                 goto unencap;
1753         }
1754
1755         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
1756                 goto nla_put_failure;
1757
1758         if (swkey->eth.type == htons(ETH_P_IP)) {
1759                 struct ovs_key_ipv4 *ipv4_key;
1760
1761                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
1762                 if (!nla)
1763                         goto nla_put_failure;
1764                 ipv4_key = nla_data(nla);
1765                 ipv4_key->ipv4_src = output->ipv4.addr.src;
1766                 ipv4_key->ipv4_dst = output->ipv4.addr.dst;
1767                 ipv4_key->ipv4_proto = output->ip.proto;
1768                 ipv4_key->ipv4_tos = output->ip.tos;
1769                 ipv4_key->ipv4_ttl = output->ip.ttl;
1770                 ipv4_key->ipv4_frag = output->ip.frag;
1771         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1772                 struct ovs_key_ipv6 *ipv6_key;
1773
1774                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
1775                 if (!nla)
1776                         goto nla_put_failure;
1777                 ipv6_key = nla_data(nla);
1778                 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
1779                                 sizeof(ipv6_key->ipv6_src));
1780                 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
1781                                 sizeof(ipv6_key->ipv6_dst));
1782                 ipv6_key->ipv6_label = output->ipv6.label;
1783                 ipv6_key->ipv6_proto = output->ip.proto;
1784                 ipv6_key->ipv6_tclass = output->ip.tos;
1785                 ipv6_key->ipv6_hlimit = output->ip.ttl;
1786                 ipv6_key->ipv6_frag = output->ip.frag;
1787         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
1788                    swkey->eth.type == htons(ETH_P_RARP)) {
1789                 struct ovs_key_arp *arp_key;
1790
1791                 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
1792                 if (!nla)
1793                         goto nla_put_failure;
1794                 arp_key = nla_data(nla);
1795                 memset(arp_key, 0, sizeof(struct ovs_key_arp));
1796                 arp_key->arp_sip = output->ipv4.addr.src;
1797                 arp_key->arp_tip = output->ipv4.addr.dst;
1798                 arp_key->arp_op = htons(output->ip.proto);
1799                 memcpy(arp_key->arp_sha, output->ipv4.arp.sha, ETH_ALEN);
1800                 memcpy(arp_key->arp_tha, output->ipv4.arp.tha, ETH_ALEN);
1801         }
1802
1803         if ((swkey->eth.type == htons(ETH_P_IP) ||
1804              swkey->eth.type == htons(ETH_P_IPV6)) &&
1805              swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1806
1807                 if (swkey->ip.proto == IPPROTO_TCP) {
1808                         struct ovs_key_tcp *tcp_key;
1809
1810                         nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
1811                         if (!nla)
1812                                 goto nla_put_failure;
1813                         tcp_key = nla_data(nla);
1814                         if (swkey->eth.type == htons(ETH_P_IP)) {
1815                                 tcp_key->tcp_src = output->ipv4.tp.src;
1816                                 tcp_key->tcp_dst = output->ipv4.tp.dst;
1817                         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1818                                 tcp_key->tcp_src = output->ipv6.tp.src;
1819                                 tcp_key->tcp_dst = output->ipv6.tp.dst;
1820                         }
1821                 } else if (swkey->ip.proto == IPPROTO_UDP) {
1822                         struct ovs_key_udp *udp_key;
1823
1824                         nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
1825                         if (!nla)
1826                                 goto nla_put_failure;
1827                         udp_key = nla_data(nla);
1828                         if (swkey->eth.type == htons(ETH_P_IP)) {
1829                                 udp_key->udp_src = output->ipv4.tp.src;
1830                                 udp_key->udp_dst = output->ipv4.tp.dst;
1831                         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1832                                 udp_key->udp_src = output->ipv6.tp.src;
1833                                 udp_key->udp_dst = output->ipv6.tp.dst;
1834                         }
1835                 } else if (swkey->eth.type == htons(ETH_P_IP) &&
1836                            swkey->ip.proto == IPPROTO_ICMP) {
1837                         struct ovs_key_icmp *icmp_key;
1838
1839                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
1840                         if (!nla)
1841                                 goto nla_put_failure;
1842                         icmp_key = nla_data(nla);
1843                         icmp_key->icmp_type = ntohs(output->ipv4.tp.src);
1844                         icmp_key->icmp_code = ntohs(output->ipv4.tp.dst);
1845                 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
1846                            swkey->ip.proto == IPPROTO_ICMPV6) {
1847                         struct ovs_key_icmpv6 *icmpv6_key;
1848
1849                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
1850                                                 sizeof(*icmpv6_key));
1851                         if (!nla)
1852                                 goto nla_put_failure;
1853                         icmpv6_key = nla_data(nla);
1854                         icmpv6_key->icmpv6_type = ntohs(output->ipv6.tp.src);
1855                         icmpv6_key->icmpv6_code = ntohs(output->ipv6.tp.dst);
1856
1857                         if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
1858                             icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
1859                                 struct ovs_key_nd *nd_key;
1860
1861                                 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
1862                                 if (!nla)
1863                                         goto nla_put_failure;
1864                                 nd_key = nla_data(nla);
1865                                 memcpy(nd_key->nd_target, &output->ipv6.nd.target,
1866                                                         sizeof(nd_key->nd_target));
1867                                 memcpy(nd_key->nd_sll, output->ipv6.nd.sll, ETH_ALEN);
1868                                 memcpy(nd_key->nd_tll, output->ipv6.nd.tll, ETH_ALEN);
1869                         }
1870                 }
1871         }
1872
1873 unencap:
1874         if (encap)
1875                 nla_nest_end(skb, encap);
1876
1877         return 0;
1878
1879 nla_put_failure:
1880         return -EMSGSIZE;
1881 }
1882
1883 /* Initializes the flow module.
1884  * Returns zero if successful or a negative error code. */
1885 int ovs_flow_init(void)
1886 {
1887         flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow), 0,
1888                                         0, NULL);
1889         if (flow_cache == NULL)
1890                 return -ENOMEM;
1891
1892         return 0;
1893 }
1894
1895 /* Uninitializes the flow module. */
1896 void ovs_flow_exit(void)
1897 {
1898         kmem_cache_destroy(flow_cache);
1899 }
1900
1901 struct sw_flow_mask *ovs_sw_flow_mask_alloc(void)
1902 {
1903         struct sw_flow_mask *mask;
1904
1905         mask = kmalloc(sizeof(*mask), GFP_KERNEL);
1906         if (mask)
1907                 mask->ref_count = 0;
1908
1909         return mask;
1910 }
1911
1912 void ovs_sw_flow_mask_add_ref(struct sw_flow_mask *mask)
1913 {
1914         mask->ref_count++;
1915 }
1916
1917 static void rcu_free_sw_flow_mask_cb(struct rcu_head *rcu)
1918 {
1919         struct sw_flow_mask *mask = container_of(rcu, struct sw_flow_mask, rcu);
1920
1921         kfree(mask);
1922 }
1923
1924 void ovs_sw_flow_mask_del_ref(struct sw_flow_mask *mask, bool deferred)
1925 {
1926         if (!mask)
1927                 return;
1928
1929         BUG_ON(!mask->ref_count);
1930         mask->ref_count--;
1931
1932         if (!mask->ref_count) {
1933                 list_del_rcu(&mask->list);
1934                 if (deferred)
1935                         call_rcu(&mask->rcu, rcu_free_sw_flow_mask_cb);
1936                 else
1937                         kfree(mask);
1938         }
1939 }
1940
1941 static bool ovs_sw_flow_mask_equal(const struct sw_flow_mask *a,
1942                 const struct sw_flow_mask *b)
1943 {
1944         u8 *a_ = (u8 *)&a->key + a->range.start;
1945         u8 *b_ = (u8 *)&b->key + b->range.start;
1946
1947         return  (a->range.end == b->range.end)
1948                 && (a->range.start == b->range.start)
1949                 && (memcmp(a_, b_, ovs_sw_flow_mask_actual_size(a)) == 0);
1950 }
1951
1952 struct sw_flow_mask *ovs_sw_flow_mask_find(const struct flow_table *tbl,
1953                                            const struct sw_flow_mask *mask)
1954 {
1955         struct list_head *ml;
1956
1957         list_for_each(ml, tbl->mask_list) {
1958                 struct sw_flow_mask *m;
1959                 m = container_of(ml, struct sw_flow_mask, list);
1960                 if (ovs_sw_flow_mask_equal(mask, m))
1961                         return m;
1962         }
1963
1964         return NULL;
1965 }
1966
1967 /**
1968  * add a new mask into the mask list.
1969  * The caller needs to make sure that 'mask' is not the same
1970  * as any masks that are already on the list.
1971  */
1972 void ovs_sw_flow_mask_insert(struct flow_table *tbl, struct sw_flow_mask *mask)
1973 {
1974         list_add_rcu(&mask->list, tbl->mask_list);
1975 }
1976
1977 /**
1978  * Set 'range' fields in the mask to the value of 'val'.
1979  */
1980 static void ovs_sw_flow_mask_set(struct sw_flow_mask *mask,
1981                 struct sw_flow_key_range *range, u8 val)
1982 {
1983         u8 *m = (u8 *)&mask->key + range->start;
1984
1985         mask->range = *range;
1986         memset(m, val, ovs_sw_flow_mask_size_roundup(mask));
1987 }