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