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         /* Tunnel mask is always allowed. */
 139         mask_allowed |= (1ULL << OVS_KEY_ATTR_TUNNEL);
 140
 141         if (match->key->phy.in_port == DP_MAX_PORTS &&
 142             match->mask && (match->mask->key.phy.in_port == 0xffff))
 143                 mask_allowed |= (1ULL << OVS_KEY_ATTR_IN_PORT);
 144
 145         if (match->key->eth.type == htons(ETH_P_802_2) &&
 146             match->mask && (match->mask->key.eth.type == htons(0xffff)))
 147                 mask_allowed |= (1ULL << OVS_KEY_ATTR_ETHERTYPE);
 148
 149         /* Check key attributes. */
 150         if (match->key->eth.type == htons(ETH_P_ARP)
 151                         || match->key->eth.type == htons(ETH_P_RARP)) {
 152                 key_expected |= 1ULL << OVS_KEY_ATTR_ARP;
 153                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 154                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ARP;
 155         }
 156
 157         if (match->key->eth.type == htons(ETH_P_IP)) {
 158                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV4;
 159                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 160                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV4;
 161
 162                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 163                         if (match->key->ip.proto == IPPROTO_UDP) {
 164                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 165                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 166                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 167                         }
 168
 169                         if (match->key->ip.proto == IPPROTO_TCP) {
 170                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 171                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 172                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 173                         }
 174
 175                         if (match->key->ip.proto == IPPROTO_ICMP) {
 176                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMP;
 177                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 178                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMP;
 179                         }
 180                 }
 181         }
 182
 183         if (match->key->eth.type == htons(ETH_P_IPV6)) {
 184                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV6;
 185                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 186                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV6;
 187
 188                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 189                         if (match->key->ip.proto == IPPROTO_UDP) {
 190                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 191                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 192                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 193                         }
 194
 195                         if (match->key->ip.proto == IPPROTO_TCP) {
 196                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 197                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 198                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 199                         }
 200
 201                         if (match->key->ip.proto == IPPROTO_ICMPV6) {
 202                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 203                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 204                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 205
 206                                 if (match->key->ipv6.tp.src ==
 207                                                 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 208                                     match->key->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 209                                         key_expected |= 1ULL << OVS_KEY_ATTR_ND;
 210                                         if (match->mask && (match->mask->key.ipv6.tp.src == htons(0xffff)))
 211                                                 mask_allowed |= 1ULL << OVS_KEY_ATTR_ND;
 212                                 }
 213                         }
 214                 }
 215         }
 216
 217         if ((key_attrs & key_expected) != key_expected) {
 218                 /* Key attributes check failed. */
 219                 OVS_NLERR("Missing expected key attributes (key_attrs=%llx, expected=%llx).\n",
 220                                 key_attrs, key_expected);
 221                 return false;
 222         }
 223
 224         if ((mask_attrs & mask_allowed) != mask_attrs) {
 225                 /* Mask attributes check failed. */
 226                 OVS_NLERR("Contain more than allowed mask fields (mask_attrs=%llx, mask_allowed=%llx).\n",
 227                                 mask_attrs, mask_allowed);
 228                 return false;
 229         }
 230
 231         return true;
 232 }
 233
 234 static int check_header(struct sk_buff *skb, int len)
 235 {
 236         if (unlikely(skb->len < len))
 237                 return -EINVAL;
 238         if (unlikely(!pskb_may_pull(skb, len)))
 239                 return -ENOMEM;
 240         return 0;
 241 }
 242
 243 static bool arphdr_ok(struct sk_buff *skb)
 244 {
 245         return pskb_may_pull(skb, skb_network_offset(skb) +
 246                                   sizeof(struct arp_eth_header));
 247 }
 248
 249 static int check_iphdr(struct sk_buff *skb)
 250 {
 251         unsigned int nh_ofs = skb_network_offset(skb);
 252         unsigned int ip_len;
 253         int err;
 254
 255         err = check_header(skb, nh_ofs + sizeof(struct iphdr));
 256         if (unlikely(err))
 257                 return err;
 258
 259         ip_len = ip_hdrlen(skb);
 260         if (unlikely(ip_len < sizeof(struct iphdr) ||
 261                      skb->len < nh_ofs + ip_len))
 262                 return -EINVAL;
 263
 264         skb_set_transport_header(skb, nh_ofs + ip_len);
 265         return 0;
 266 }
 267
 268 static bool tcphdr_ok(struct sk_buff *skb)
 269 {
 270         int th_ofs = skb_transport_offset(skb);
 271         int tcp_len;
 272
 273         if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
 274                 return false;
 275
 276         tcp_len = tcp_hdrlen(skb);
 277         if (unlikely(tcp_len < sizeof(struct tcphdr) ||
 278                      skb->len < th_ofs + tcp_len))
 279                 return false;
 280
 281         return true;
 282 }
 283
 284 static bool udphdr_ok(struct sk_buff *skb)
 285 {
 286         return pskb_may_pull(skb, skb_transport_offset(skb) +
 287                                   sizeof(struct udphdr));
 288 }
 289
 290 static bool icmphdr_ok(struct sk_buff *skb)
 291 {
 292         return pskb_may_pull(skb, skb_transport_offset(skb) +
 293                                   sizeof(struct icmphdr));
 294 }
 295
 296 u64 ovs_flow_used_time(unsigned long flow_jiffies)
 297 {
 298         struct timespec cur_ts;
 299         u64 cur_ms, idle_ms;
 300
 301         ktime_get_ts(&cur_ts);
 302         idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
 303         cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
 304                  cur_ts.tv_nsec / NSEC_PER_MSEC;
 305
 306         return cur_ms - idle_ms;
 307 }
 308
 309 static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
 310 {
 311         unsigned int nh_ofs = skb_network_offset(skb);
 312         unsigned int nh_len;
 313         int payload_ofs;
 314         struct ipv6hdr *nh;
 315         uint8_t nexthdr;
 316         __be16 frag_off;
 317         int err;
 318
 319         err = check_header(skb, nh_ofs + sizeof(*nh));
 320         if (unlikely(err))
 321                 return err;
 322
 323         nh = ipv6_hdr(skb);
 324         nexthdr = nh->nexthdr;
 325         payload_ofs = (u8 *)(nh + 1) - skb->data;
 326
 327         key->ip.proto = NEXTHDR_NONE;
 328         key->ip.tos = ipv6_get_dsfield(nh);
 329         key->ip.ttl = nh->hop_limit;
 330         key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
 331         key->ipv6.addr.src = nh->saddr;
 332         key->ipv6.addr.dst = nh->daddr;
 333
 334         payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
 335         if (unlikely(payload_ofs < 0))
 336                 return -EINVAL;
 337
 338         if (frag_off) {
 339                 if (frag_off & htons(~0x7))
 340                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 341                 else
 342                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 343         }
 344
 345         nh_len = payload_ofs - nh_ofs;
 346         skb_set_transport_header(skb, nh_ofs + nh_len);
 347         key->ip.proto = nexthdr;
 348         return nh_len;
 349 }
 350
 351 static bool icmp6hdr_ok(struct sk_buff *skb)
 352 {
 353         return pskb_may_pull(skb, skb_transport_offset(skb) +
 354                                   sizeof(struct icmp6hdr));
 355 }
 356
 357 void ovs_flow_key_mask(struct sw_flow_key *dst, const struct sw_flow_key *src,
 358                        const struct sw_flow_mask *mask)
 359 {
 360         u8 *m = (u8 *)&mask->key + mask->range.start;
 361         u8 *s = (u8 *)src + mask->range.start;
 362         u8 *d = (u8 *)dst + mask->range.start;
 363         int i;
 364
 365         memset(dst, 0, sizeof(*dst));
 366         for (i = 0; i < ovs_sw_flow_mask_size_roundup(mask); i++) {
 367                 *d = *s & *m;
 368                 d++, s++, m++;
 369         }
 370 }
 371
 372 #define TCP_FLAGS_OFFSET 13
 373 #define TCP_FLAG_MASK 0x3f
 374
 375 void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb)
 376 {
 377         u8 tcp_flags = 0;
 378
 379         if ((flow->key.eth.type == htons(ETH_P_IP) ||
 380              flow->key.eth.type == htons(ETH_P_IPV6)) &&
 381             flow->key.ip.proto == IPPROTO_TCP &&
 382             likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) {
 383                 u8 *tcp = (u8 *)tcp_hdr(skb);
 384                 tcp_flags = *(tcp + TCP_FLAGS_OFFSET) & TCP_FLAG_MASK;
 385         }
 386
 387         spin_lock(&flow->lock);
 388         flow->used = jiffies;
 389         flow->packet_count++;
 390         flow->byte_count += skb->len;
 391         flow->tcp_flags |= tcp_flags;
 392         spin_unlock(&flow->lock);
 393 }
 394
 395 struct sw_flow_actions *ovs_flow_actions_alloc(int size)
 396 {
 397         struct sw_flow_actions *sfa;
 398
 399         if (size > MAX_ACTIONS_BUFSIZE)
 400                 return ERR_PTR(-EINVAL);
 401
 402         sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
 403         if (!sfa)
 404                 return ERR_PTR(-ENOMEM);
 405
 406         sfa->actions_len = 0;
 407         return sfa;
 408 }
 409
 410 struct sw_flow *ovs_flow_alloc(void)
 411 {
 412         struct sw_flow *flow;
 413
 414         flow = kmem_cache_alloc(flow_cache, GFP_KERNEL);
 415         if (!flow)
 416                 return ERR_PTR(-ENOMEM);
 417
 418         spin_lock_init(&flow->lock);
 419         flow->sf_acts = NULL;
 420         flow->mask = NULL;
 421
 422         return flow;
 423 }
 424
 425 static struct hlist_head *find_bucket(struct flow_table *table, u32 hash)
 426 {
 427         hash = jhash_1word(hash, table->hash_seed);
 428         return flex_array_get(table->buckets,
 429                                 (hash & (table->n_buckets - 1)));
 430 }
 431
 432 static struct flex_array *alloc_buckets(unsigned int n_buckets)
 433 {
 434         struct flex_array *buckets;
 435         int i, err;
 436
 437         buckets = flex_array_alloc(sizeof(struct hlist_head *),
 438                                    n_buckets, GFP_KERNEL);
 439         if (!buckets)
 440                 return NULL;
 441
 442         err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL);
 443         if (err) {
 444                 flex_array_free(buckets);
 445                 return NULL;
 446         }
 447
 448         for (i = 0; i < n_buckets; i++)
 449                 INIT_HLIST_HEAD((struct hlist_head *)
 450                                         flex_array_get(buckets, i));
 451
 452         return buckets;
 453 }
 454
 455 static void free_buckets(struct flex_array *buckets)
 456 {
 457         flex_array_free(buckets);
 458 }
 459
 460 static struct flow_table *__flow_tbl_alloc(int new_size)
 461 {
 462         struct flow_table *table = kmalloc(sizeof(*table), GFP_KERNEL);
 463
 464         if (!table)
 465                 return NULL;
 466
 467         table->buckets = alloc_buckets(new_size);
 468
 469         if (!table->buckets) {
 470                 kfree(table);
 471                 return NULL;
 472         }
 473         table->n_buckets = new_size;
 474         table->count = 0;
 475         table->node_ver = 0;
 476         table->keep_flows = false;
 477         get_random_bytes(&table->hash_seed, sizeof(u32));
 478         table->mask_list = NULL;
 479
 480         return table;
 481 }
 482
 483 static void __flow_tbl_destroy(struct flow_table *table)
 484 {
 485         int i;
 486
 487         if (table->keep_flows)
 488                 goto skip_flows;
 489
 490         for (i = 0; i < table->n_buckets; i++) {
 491                 struct sw_flow *flow;
 492                 struct hlist_head *head = flex_array_get(table->buckets, i);
 493                 struct hlist_node *n;
 494                 int ver = table->node_ver;
 495
 496                 hlist_for_each_entry_safe(flow, n, head, hash_node[ver]) {
 497                         hlist_del_rcu(&flow->hash_node[ver]);
 498                         ovs_flow_free(flow, false);
 499                 }
 500         }
 501
 502         BUG_ON(!list_empty(table->mask_list));
 503         kfree(table->mask_list);
 504
 505 skip_flows:
 506         free_buckets(table->buckets);
 507         kfree(table);
 508 }
 509
 510 struct flow_table *ovs_flow_tbl_alloc(int new_size)
 511 {
 512         struct flow_table *table = __flow_tbl_alloc(new_size);
 513
 514         if (!table)
 515                 return NULL;
 516
 517         table->mask_list = kmalloc(sizeof(struct list_head), GFP_KERNEL);
 518         if (!table->mask_list) {
 519                 table->keep_flows = true;
 520                 __flow_tbl_destroy(table);
 521                 return NULL;
 522         }
 523         INIT_LIST_HEAD(table->mask_list);
 524
 525         return table;
 526 }
 527
 528 static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu)
 529 {
 530         struct flow_table *table = container_of(rcu, struct flow_table, rcu);
 531
 532         __flow_tbl_destroy(table);
 533 }
 534
 535 void ovs_flow_tbl_destroy(struct flow_table *table, bool deferred)
 536 {
 537         if (!table)
 538                 return;
 539
 540         if (deferred)
 541                 call_rcu(&table->rcu, flow_tbl_destroy_rcu_cb);
 542         else
 543                 __flow_tbl_destroy(table);
 544 }
 545
 546 struct sw_flow *ovs_flow_dump_next(struct flow_table *table, u32 *bucket, u32 *last)
 547 {
 548         struct sw_flow *flow;
 549         struct hlist_head *head;
 550         int ver;
 551         int i;
 552
 553         ver = table->node_ver;
 554         while (*bucket < table->n_buckets) {
 555                 i = 0;
 556                 head = flex_array_get(table->buckets, *bucket);
 557                 hlist_for_each_entry_rcu(flow, head, hash_node[ver]) {
 558                         if (i < *last) {
 559                                 i++;
 560                                 continue;
 561                         }
 562                         *last = i + 1;
 563                         return flow;
 564                 }
 565                 (*bucket)++;
 566                 *last = 0;
 567         }
 568
 569         return NULL;
 570 }
 571
 572 static void __tbl_insert(struct flow_table *table, struct sw_flow *flow)
 573 {
 574         struct hlist_head *head;
 575
 576         head = find_bucket(table, flow->hash);
 577         hlist_add_head_rcu(&flow->hash_node[table->node_ver], head);
 578
 579         table->count++;
 580 }
 581
 582 static void flow_table_copy_flows(struct flow_table *old, struct flow_table *new)
 583 {
 584         int old_ver;
 585         int i;
 586
 587         old_ver = old->node_ver;
 588         new->node_ver = !old_ver;
 589
 590         /* Insert in new table. */
 591         for (i = 0; i < old->n_buckets; i++) {
 592                 struct sw_flow *flow;
 593                 struct hlist_head *head;
 594
 595                 head = flex_array_get(old->buckets, i);
 596
 597                 hlist_for_each_entry(flow, head, hash_node[old_ver])
 598                         __tbl_insert(new, flow);
 599         }
 600
 601         new->mask_list = old->mask_list;
 602         old->keep_flows = true;
 603 }
 604
 605 static struct flow_table *__flow_tbl_rehash(struct flow_table *table, int n_buckets)
 606 {
 607         struct flow_table *new_table;
 608
 609         new_table = __flow_tbl_alloc(n_buckets);
 610         if (!new_table)
 611                 return ERR_PTR(-ENOMEM);
 612
 613         flow_table_copy_flows(table, new_table);
 614
 615         return new_table;
 616 }
 617
 618 struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table)
 619 {
 620         return __flow_tbl_rehash(table, table->n_buckets);
 621 }
 622
 623 struct flow_table *ovs_flow_tbl_expand(struct flow_table *table)
 624 {
 625         return __flow_tbl_rehash(table, table->n_buckets * 2);
 626 }
 627
 628 static void __flow_free(struct sw_flow *flow)
 629 {
 630         kfree((struct sf_flow_acts __force *)flow->sf_acts);
 631         kmem_cache_free(flow_cache, flow);
 632 }
 633
 634 static void rcu_free_flow_callback(struct rcu_head *rcu)
 635 {
 636         struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu);
 637
 638         __flow_free(flow);
 639 }
 640
 641 void ovs_flow_free(struct sw_flow *flow, bool deferred)
 642 {
 643         if (!flow)
 644                 return;
 645
 646         ovs_sw_flow_mask_del_ref(flow->mask, deferred);
 647
 648         if (deferred)
 649                 call_rcu(&flow->rcu, rcu_free_flow_callback);
 650         else
 651                 __flow_free(flow);
 652 }
 653
 654 /* RCU callback used by ovs_flow_deferred_free_acts. */
 655 static void rcu_free_acts_callback(struct rcu_head *rcu)
 656 {
 657         struct sw_flow_actions *sf_acts = container_of(rcu,
 658                         struct sw_flow_actions, rcu);
 659         kfree(sf_acts);
 660 }
 661
 662 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
 663  * The caller must hold rcu_read_lock for this to be sensible. */
 664 void ovs_flow_deferred_free_acts(struct sw_flow_actions *sf_acts)
 665 {
 666         call_rcu(&sf_acts->rcu, rcu_free_acts_callback);
 667 }
 668
 669 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
 670 {
 671         struct qtag_prefix {
 672                 __be16 eth_type; /* ETH_P_8021Q */
 673                 __be16 tci;
 674         };
 675         struct qtag_prefix *qp;
 676
 677         if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
 678                 return 0;
 679
 680         if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
 681                                          sizeof(__be16))))
 682                 return -ENOMEM;
 683
 684         qp = (struct qtag_prefix *) skb->data;
 685         key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
 686         __skb_pull(skb, sizeof(struct qtag_prefix));
 687
 688         return 0;
 689 }
 690
 691 static __be16 parse_ethertype(struct sk_buff *skb)
 692 {
 693         struct llc_snap_hdr {
 694                 u8  dsap;  /* Always 0xAA */
 695                 u8  ssap;  /* Always 0xAA */
 696                 u8  ctrl;
 697                 u8  oui[3];
 698                 __be16 ethertype;
 699         };
 700         struct llc_snap_hdr *llc;
 701         __be16 proto;
 702
 703         proto = *(__be16 *) skb->data;
 704         __skb_pull(skb, sizeof(__be16));
 705
 706         if (ntohs(proto) >= ETH_P_802_3_MIN)
 707                 return proto;
 708
 709         if (skb->len < sizeof(struct llc_snap_hdr))
 710                 return htons(ETH_P_802_2);
 711
 712         if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
 713                 return htons(0);
 714
 715         llc = (struct llc_snap_hdr *) skb->data;
 716         if (llc->dsap != LLC_SAP_SNAP ||
 717             llc->ssap != LLC_SAP_SNAP ||
 718             (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
 719                 return htons(ETH_P_802_2);
 720
 721         __skb_pull(skb, sizeof(struct llc_snap_hdr));
 722
 723         if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
 724                 return llc->ethertype;
 725
 726         return htons(ETH_P_802_2);
 727 }
 728
 729 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
 730                         int nh_len)
 731 {
 732         struct icmp6hdr *icmp = icmp6_hdr(skb);
 733
 734         /* The ICMPv6 type and code fields use the 16-bit transport port
 735          * fields, so we need to store them in 16-bit network byte order.
 736          */
 737         key->ipv6.tp.src = htons(icmp->icmp6_type);
 738         key->ipv6.tp.dst = htons(icmp->icmp6_code);
 739
 740         if (icmp->icmp6_code == 0 &&
 741             (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
 742              icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 743                 int icmp_len = skb->len - skb_transport_offset(skb);
 744                 struct nd_msg *nd;
 745                 int offset;
 746
 747                 /* In order to process neighbor discovery options, we need the
 748                  * entire packet.
 749                  */
 750                 if (unlikely(icmp_len < sizeof(*nd)))
 751                         return 0;
 752
 753                 if (unlikely(skb_linearize(skb)))
 754                         return -ENOMEM;
 755
 756                 nd = (struct nd_msg *)skb_transport_header(skb);
 757                 key->ipv6.nd.target = nd->target;
 758
 759                 icmp_len -= sizeof(*nd);
 760                 offset = 0;
 761                 while (icmp_len >= 8) {
 762                         struct nd_opt_hdr *nd_opt =
 763                                  (struct nd_opt_hdr *)(nd->opt + offset);
 764                         int opt_len = nd_opt->nd_opt_len * 8;
 765
 766                         if (unlikely(!opt_len || opt_len > icmp_len))
 767                                 return 0;
 768
 769                         /* Store the link layer address if the appropriate
 770                          * option is provided.  It is considered an error if
 771                          * the same link layer option is specified twice.
 772                          */
 773                         if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
 774                             && opt_len == 8) {
 775                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
 776                                         goto invalid;
 777                                 memcpy(key->ipv6.nd.sll,
 778                                     &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
 779                         } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
 780                                    && opt_len == 8) {
 781                                 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
 782                                         goto invalid;
 783                                 memcpy(key->ipv6.nd.tll,
 784                                     &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
 785                         }
 786
 787                         icmp_len -= opt_len;
 788                         offset += opt_len;
 789                 }
 790         }
 791
 792         return 0;
 793
 794 invalid:
 795         memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
 796         memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
 797         memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
 798
 799         return 0;
 800 }
 801
 802 /**
 803  * ovs_flow_extract - extracts a flow key from an Ethernet frame.
 804  * @skb: sk_buff that contains the frame, with skb->data pointing to the
 805  * Ethernet header
 806  * @in_port: port number on which @skb was received.
 807  * @key: output flow key
 808  * @key_lenp: length of output flow key
 809  *
 810  * The caller must ensure that skb->len >= ETH_HLEN.
 811  *
 812  * Returns 0 if successful, otherwise a negative errno value.
 813  *
 814  * Initializes @skb header pointers as follows:
 815  *
 816  *    - skb->mac_header: the Ethernet header.
 817  *
 818  *    - skb->network_header: just past the Ethernet header, or just past the
 819  *      VLAN header, to the first byte of the Ethernet payload.
 820  *
 821  *    - skb->transport_header: If key->dl_type is ETH_P_IP or ETH_P_IPV6
 822  *      on output, then just past the IP header, if one is present and
 823  *      of a correct length, otherwise the same as skb->network_header.
 824  *      For other key->dl_type values it is left untouched.
 825  */
 826 int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
 827 {
 828         int error;
 829         struct ethhdr *eth;
 830
 831         memset(key, 0, sizeof(*key));
 832
 833         key->phy.priority = skb->priority;
 834         if (OVS_CB(skb)->tun_key)
 835                 memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key));
 836         key->phy.in_port = in_port;
 837         key->phy.skb_mark = skb_get_mark(skb);
 838
 839         skb_reset_mac_header(skb);
 840
 841         /* Link layer.  We are guaranteed to have at least the 14 byte Ethernet
 842          * header in the linear data area.
 843          */
 844         eth = eth_hdr(skb);
 845         memcpy(key->eth.src, eth->h_source, ETH_ALEN);
 846         memcpy(key->eth.dst, eth->h_dest, ETH_ALEN);
 847
 848         __skb_pull(skb, 2 * ETH_ALEN);
 849
 850         if (vlan_tx_tag_present(skb))
 851                 key->eth.tci = htons(vlan_get_tci(skb));
 852         else if (eth->h_proto == htons(ETH_P_8021Q))
 853                 if (unlikely(parse_vlan(skb, key)))
 854                         return -ENOMEM;
 855
 856         key->eth.type = parse_ethertype(skb);
 857         if (unlikely(key->eth.type == htons(0)))
 858                 return -ENOMEM;
 859
 860         skb_reset_network_header(skb);
 861         __skb_push(skb, skb->data - skb_mac_header(skb));
 862
 863         /* Network layer. */
 864         if (key->eth.type == htons(ETH_P_IP)) {
 865                 struct iphdr *nh;
 866                 __be16 offset;
 867
 868                 error = check_iphdr(skb);
 869                 if (unlikely(error)) {
 870                         if (error == -EINVAL) {
 871                                 skb->transport_header = skb->network_header;
 872                                 error = 0;
 873                         }
 874                         return error;
 875                 }
 876
 877                 nh = ip_hdr(skb);
 878                 key->ipv4.addr.src = nh->saddr;
 879                 key->ipv4.addr.dst = nh->daddr;
 880
 881                 key->ip.proto = nh->protocol;
 882                 key->ip.tos = nh->tos;
 883                 key->ip.ttl = nh->ttl;
 884
 885                 offset = nh->frag_off & htons(IP_OFFSET);
 886                 if (offset) {
 887                         key->ip.frag = OVS_FRAG_TYPE_LATER;
 888                         return 0;
 889                 }
 890                 if (nh->frag_off & htons(IP_MF) ||
 891                          skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 892                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 893
 894                 /* Transport layer. */
 895                 if (key->ip.proto == IPPROTO_TCP) {
 896                         if (tcphdr_ok(skb)) {
 897                                 struct tcphdr *tcp = tcp_hdr(skb);
 898                                 key->ipv4.tp.src = tcp->source;
 899                                 key->ipv4.tp.dst = tcp->dest;
 900                         }
 901                 } else if (key->ip.proto == IPPROTO_UDP) {
 902                         if (udphdr_ok(skb)) {
 903                                 struct udphdr *udp = udp_hdr(skb);
 904                                 key->ipv4.tp.src = udp->source;
 905                                 key->ipv4.tp.dst = udp->dest;
 906                         }
 907                 } else if (key->ip.proto == IPPROTO_ICMP) {
 908                         if (icmphdr_ok(skb)) {
 909                                 struct icmphdr *icmp = icmp_hdr(skb);
 910                                 /* The ICMP type and code fields use the 16-bit
 911                                  * transport port fields, so we need to store
 912                                  * them in 16-bit network byte order. */
 913                                 key->ipv4.tp.src = htons(icmp->type);
 914                                 key->ipv4.tp.dst = htons(icmp->code);
 915                         }
 916                 }
 917
 918         } else if ((key->eth.type == htons(ETH_P_ARP) ||
 919                    key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) {
 920                 struct arp_eth_header *arp;
 921
 922                 arp = (struct arp_eth_header *)skb_network_header(skb);
 923
 924                 if (arp->ar_hrd == htons(ARPHRD_ETHER)
 925                                 && arp->ar_pro == htons(ETH_P_IP)
 926                                 && arp->ar_hln == ETH_ALEN
 927                                 && arp->ar_pln == 4) {
 928
 929                         /* We only match on the lower 8 bits of the opcode. */
 930                         if (ntohs(arp->ar_op) <= 0xff)
 931                                 key->ip.proto = ntohs(arp->ar_op);
 932                         memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
 933                         memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
 934                         memcpy(key->ipv4.arp.sha, arp->ar_sha, ETH_ALEN);
 935                         memcpy(key->ipv4.arp.tha, arp->ar_tha, ETH_ALEN);
 936                 }
 937         } else if (key->eth.type == htons(ETH_P_IPV6)) {
 938                 int nh_len;             /* IPv6 Header + Extensions */
 939
 940                 nh_len = parse_ipv6hdr(skb, key);
 941                 if (unlikely(nh_len < 0)) {
 942                         if (nh_len == -EINVAL) {
 943                                 skb->transport_header = skb->network_header;
 944                                 error = 0;
 945                         } else {
 946                                 error = nh_len;
 947                         }
 948                         return error;
 949                 }
 950
 951                 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
 952                         return 0;
 953                 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 954                         key->ip.frag = OVS_FRAG_TYPE_FIRST;
 955
 956                 /* Transport layer. */
 957                 if (key->ip.proto == NEXTHDR_TCP) {
 958                         if (tcphdr_ok(skb)) {
 959                                 struct tcphdr *tcp = tcp_hdr(skb);
 960                                 key->ipv6.tp.src = tcp->source;
 961                                 key->ipv6.tp.dst = tcp->dest;
 962                         }
 963                 } else if (key->ip.proto == NEXTHDR_UDP) {
 964                         if (udphdr_ok(skb)) {
 965                                 struct udphdr *udp = udp_hdr(skb);
 966                                 key->ipv6.tp.src = udp->source;
 967                                 key->ipv6.tp.dst = udp->dest;
 968                         }
 969                 } else if (key->ip.proto == NEXTHDR_ICMP) {
 970                         if (icmp6hdr_ok(skb)) {
 971                                 error = parse_icmpv6(skb, key, nh_len);
 972                                 if (error)
 973                                         return error;
 974                         }
 975                 }
 976         }
 977
 978         return 0;
 979 }
 980
 981 static u32 ovs_flow_hash(const struct sw_flow_key *key, int key_start, int key_len)
 982 {
 983         return jhash2((u32 *)((u8 *)key + key_start),
 984                       DIV_ROUND_UP(key_len - key_start, sizeof(u32)), 0);
 985 }
 986
 987 static int flow_key_start(const struct sw_flow_key *key)
 988 {
 989         if (key->tun_key.ipv4_dst)
 990                 return 0;
 991         else
 992                 return offsetof(struct sw_flow_key, phy);
 993 }
 994
 995 static bool __cmp_key(const struct sw_flow_key *key1,
 996                 const struct sw_flow_key *key2,  int key_start, int key_len)
 997 {
 998         return !memcmp((u8 *)key1 + key_start,
 999                         (u8 *)key2 + key_start, (key_len - key_start));
1000 }
1001
1002 static bool __flow_cmp_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->key, key, key_start, key_len);
1006 }
1007
1008 static bool __flow_cmp_unmasked_key(const struct sw_flow *flow,
1009                   const struct sw_flow_key *key, int key_start, int key_len)
1010 {
1011         return __cmp_key(&flow->unmasked_key, key, key_start, key_len);
1012 }
1013
1014 bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
1015                 const struct sw_flow_key *key, int key_len)
1016 {
1017         int key_start;
1018         key_start = flow_key_start(key);
1019
1020         return __flow_cmp_unmasked_key(flow, key, key_start, key_len);
1021
1022 }
1023
1024 struct sw_flow *ovs_flow_lookup_unmasked_key(struct flow_table *table,
1025                                        struct sw_flow_match *match)
1026 {
1027         struct sw_flow_key *unmasked = match->key;
1028         int key_len = match->range.end;
1029         struct sw_flow *flow;
1030
1031         flow = ovs_flow_lookup(table, unmasked);
1032         if (flow && (!ovs_flow_cmp_unmasked_key(flow, unmasked, key_len)))
1033                 flow = NULL;
1034
1035         return flow;
1036 }
1037
1038 static struct sw_flow *ovs_masked_flow_lookup(struct flow_table *table,
1039                                     const struct sw_flow_key *flow_key,
1040                                     struct sw_flow_mask *mask)
1041 {
1042         struct sw_flow *flow;
1043         struct hlist_head *head;
1044         int key_start = mask->range.start;
1045         int key_len = mask->range.end;
1046         u32 hash;
1047         struct sw_flow_key masked_key;
1048
1049         ovs_flow_key_mask(&masked_key, flow_key, mask);
1050         hash = ovs_flow_hash(&masked_key, key_start, key_len);
1051         head = find_bucket(table, hash);
1052         hlist_for_each_entry_rcu(flow, head, hash_node[table->node_ver]) {
1053                 if (flow->mask == mask &&
1054                     __flow_cmp_key(flow, &masked_key, key_start, key_len))
1055                         return flow;
1056         }
1057         return NULL;
1058 }
1059
1060 struct sw_flow *ovs_flow_lookup(struct flow_table *tbl,
1061                                 const struct sw_flow_key *key)
1062 {
1063         struct sw_flow *flow = NULL;
1064         struct sw_flow_mask *mask;
1065
1066         list_for_each_entry_rcu(mask, tbl->mask_list, list) {
1067                 flow = ovs_masked_flow_lookup(tbl, key, mask);
1068                 if (flow)  /* Found */
1069                         break;
1070         }
1071
1072         return flow;
1073 }
1074
1075
1076 void ovs_flow_insert(struct flow_table *table, struct sw_flow *flow)
1077 {
1078         flow->hash = ovs_flow_hash(&flow->key, flow->mask->range.start,
1079                         flow->mask->range.end);
1080         __tbl_insert(table, flow);
1081 }
1082
1083 void ovs_flow_remove(struct flow_table *table, struct sw_flow *flow)
1084 {
1085         BUG_ON(table->count == 0);
1086         hlist_del_rcu(&flow->hash_node[table->node_ver]);
1087         table->count--;
1088 }
1089
1090 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
1091 const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
1092         [OVS_KEY_ATTR_ENCAP] = -1,
1093         [OVS_KEY_ATTR_PRIORITY] = sizeof(u32),
1094         [OVS_KEY_ATTR_IN_PORT] = sizeof(u32),
1095         [OVS_KEY_ATTR_SKB_MARK] = sizeof(u32),
1096         [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet),
1097         [OVS_KEY_ATTR_VLAN] = sizeof(__be16),
1098         [OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16),
1099         [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
1100         [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
1101         [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
1102         [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
1103         [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
1104         [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
1105         [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
1106         [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
1107         [OVS_KEY_ATTR_TUNNEL] = -1,
1108 };
1109
1110 static bool is_all_zero(const u8 *fp, size_t size)
1111 {
1112         int i;
1113
1114         if (!fp)
1115                 return false;
1116
1117         for (i = 0; i < size; i++)
1118                 if (fp[i])
1119                         return false;
1120
1121         return true;
1122 }
1123
1124 static int __parse_flow_nlattrs(const struct nlattr *attr,
1125                               const struct nlattr *a[],
1126                               u64 *attrsp, bool nz)
1127 {
1128         const struct nlattr *nla;
1129         u64 attrs;
1130         int rem;
1131
1132         attrs = *attrsp;
1133         nla_for_each_nested(nla, attr, rem) {
1134                 u16 type = nla_type(nla);
1135                 int expected_len;
1136
1137                 if (type > OVS_KEY_ATTR_MAX) {
1138                         OVS_NLERR("Unknown key attribute (type=%d, max=%d).\n",
1139                                   type, OVS_KEY_ATTR_MAX);
1140                 }
1141
1142                 if (attrs & (1ULL << type)) {
1143                         OVS_NLERR("Duplicate key attribute (type %d).\n", type);
1144                         return -EINVAL;
1145                 }
1146
1147                 expected_len = ovs_key_lens[type];
1148                 if (nla_len(nla) != expected_len && expected_len != -1) {
1149                         OVS_NLERR("Key attribute has unexpected length (type=%d"
1150                                   ", length=%d, expected=%d).\n", type,
1151                                   nla_len(nla), expected_len);
1152                         return -EINVAL;
1153                 }
1154
1155                 if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
1156                         attrs |= 1ULL << type;
1157                         a[type] = nla;
1158                 }
1159         }
1160         if (rem) {
1161                 OVS_NLERR("Message has %d unknown bytes.\n", rem);
1162                 return -EINVAL;
1163         }
1164
1165         *attrsp = attrs;
1166         return 0;
1167 }
1168
1169 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
1170                               const struct nlattr *a[], u64 *attrsp)
1171 {
1172         return __parse_flow_nlattrs(attr, a, attrsp, true);
1173 }
1174
1175 static int parse_flow_nlattrs(const struct nlattr *attr,
1176                               const struct nlattr *a[], u64 *attrsp)
1177 {
1178         return __parse_flow_nlattrs(attr, a, attrsp, false);
1179 }
1180
1181 int ipv4_tun_from_nlattr(const struct nlattr *attr,
1182                          struct sw_flow_match *match, bool is_mask)
1183 {
1184         struct nlattr *a;
1185         int rem;
1186         bool ttl = false;
1187         u16 tun_flags = 0;
1188
1189         nla_for_each_nested(a, attr, rem) {
1190                 int type = nla_type(a);
1191                 static const u32 ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
1192                         [OVS_TUNNEL_KEY_ATTR_ID] = sizeof(u64),
1193                         [OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = sizeof(u32),
1194                         [OVS_TUNNEL_KEY_ATTR_IPV4_DST] = sizeof(u32),
1195                         [OVS_TUNNEL_KEY_ATTR_TOS] = 1,
1196                         [OVS_TUNNEL_KEY_ATTR_TTL] = 1,
1197                         [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = 0,
1198                         [OVS_TUNNEL_KEY_ATTR_CSUM] = 0,
1199                 };
1200
1201                 if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
1202                         OVS_NLERR("Unknown IPv4 tunnel attribute (type=%d, max=%d).\n",
1203                         type, OVS_TUNNEL_KEY_ATTR_MAX);
1204                         return -EINVAL;
1205                 }
1206
1207                 if (ovs_tunnel_key_lens[type] != nla_len(a)) {
1208                         OVS_NLERR("IPv4 tunnel attribute type has unexpected "
1209                                   " legnth (type=%d, length=%d, expected=%d).\n",
1210                                   type, nla_len(a), ovs_tunnel_key_lens[type]);
1211                         return -EINVAL;
1212                 }
1213
1214                 switch (type) {
1215                 case OVS_TUNNEL_KEY_ATTR_ID:
1216                         SW_FLOW_KEY_PUT(match, tun_key.tun_id,
1217                                         nla_get_be64(a), is_mask);
1218                         tun_flags |= OVS_TNL_F_KEY;
1219                         break;
1220                 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
1221                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_src,
1222                                         nla_get_be32(a), is_mask);
1223                         break;
1224                 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
1225                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst,
1226                                         nla_get_be32(a), is_mask);
1227                         break;
1228                 case OVS_TUNNEL_KEY_ATTR_TOS:
1229                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos,
1230                                         nla_get_u8(a), is_mask);
1231                         break;
1232                 case OVS_TUNNEL_KEY_ATTR_TTL:
1233                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_ttl,
1234                                         nla_get_u8(a), is_mask);
1235                         ttl = true;
1236                         break;
1237                 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
1238                         tun_flags |= OVS_TNL_F_DONT_FRAGMENT;
1239                         break;
1240                 case OVS_TUNNEL_KEY_ATTR_CSUM:
1241                         tun_flags |= OVS_TNL_F_CSUM;
1242                         break;
1243                 default:
1244                         return -EINVAL;
1245                 }
1246         }
1247
1248         SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
1249
1250         if (rem > 0) {
1251                 OVS_NLERR("IPv4 tunnel attribute has %d unknown bytes.\n", rem);
1252                 return -EINVAL;
1253         }
1254
1255         if (!match->key->tun_key.ipv4_dst) {
1256                 OVS_NLERR("IPv4 tunnel destination address is zero.\n");
1257                 return -EINVAL;
1258         }
1259
1260         if (!ttl) {
1261                 OVS_NLERR("IPv4 tunnel TTL not specified.\n");
1262                 return -EINVAL;
1263         }
1264
1265         return 0;
1266 }
1267
1268 int ipv4_tun_to_nlattr(struct sk_buff *skb,
1269                         const struct ovs_key_ipv4_tunnel *tun_key,
1270                         const struct ovs_key_ipv4_tunnel *output)
1271 {
1272         struct nlattr *nla;
1273
1274         nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
1275         if (!nla)
1276                 return -EMSGSIZE;
1277
1278         if (output->tun_flags & OVS_TNL_F_KEY &&
1279             nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id))
1280                 return -EMSGSIZE;
1281         if (output->ipv4_src &&
1282                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src))
1283                 return -EMSGSIZE;
1284         if (output->ipv4_dst &&
1285                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst))
1286                 return -EMSGSIZE;
1287         if (output->ipv4_tos &&
1288                 nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->ipv4_tos))
1289                 return -EMSGSIZE;
1290         if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl))
1291                 return -EMSGSIZE;
1292         if ((output->tun_flags & OVS_TNL_F_DONT_FRAGMENT) &&
1293                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
1294                 return -EMSGSIZE;
1295         if ((output->tun_flags & OVS_TNL_F_CSUM) &&
1296                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
1297                 return -EMSGSIZE;
1298
1299         nla_nest_end(skb, nla);
1300         return 0;
1301 }
1302
1303
1304 static int metadata_from_nlattrs(struct sw_flow_match *match,  u64 *attrs,
1305                 const struct nlattr **a, bool is_mask)
1306 {
1307         if (*attrs & (1ULL << OVS_KEY_ATTR_PRIORITY)) {
1308                 SW_FLOW_KEY_PUT(match, phy.priority,
1309                           nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
1310                 *attrs &= ~(1ULL << OVS_KEY_ATTR_PRIORITY);
1311         }
1312
1313         if (*attrs & (1ULL << OVS_KEY_ATTR_IN_PORT)) {
1314                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
1315
1316                 if (!is_mask && in_port >= DP_MAX_PORTS)
1317                         return -EINVAL;
1318                 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
1319                 *attrs &= ~(1ULL << OVS_KEY_ATTR_IN_PORT);
1320         } else if (!is_mask) {
1321                 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
1322         }
1323
1324         if (*attrs & (1ULL << OVS_KEY_ATTR_SKB_MARK)) {
1325                 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
1326 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20) && !defined(CONFIG_NETFILTER)
1327                 if (!is_mask && mark != 0) {
1328                         OVS_NLERR("skb->mark must be zero on this kernel (mark=%d).\n", mark);
1329                         return -EINVAL;
1330                 }
1331 #endif
1332                 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
1333                 *attrs &= ~(1ULL << OVS_KEY_ATTR_SKB_MARK);
1334         }
1335         if (*attrs & (1ULL << OVS_KEY_ATTR_TUNNEL)) {
1336                 if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
1337                                         is_mask))
1338                         return -EINVAL;
1339                 *attrs &= ~(1ULL << OVS_KEY_ATTR_TUNNEL);
1340         }
1341         return 0;
1342 }
1343
1344 static int ovs_key_from_nlattrs(struct sw_flow_match *match,  u64 attrs,
1345                 const struct nlattr **a, bool is_mask)
1346 {
1347         int err;
1348         u64 orig_attrs = attrs;
1349
1350         err = metadata_from_nlattrs(match, &attrs, a, is_mask);
1351         if (err)
1352                 return err;
1353
1354         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) {
1355                 const struct ovs_key_ethernet *eth_key;
1356
1357                 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
1358                 SW_FLOW_KEY_MEMCPY(match, eth.src,
1359                                 eth_key->eth_src, ETH_ALEN, is_mask);
1360                 SW_FLOW_KEY_MEMCPY(match, eth.dst,
1361                                 eth_key->eth_dst, ETH_ALEN, is_mask);
1362                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERNET);
1363         }
1364
1365         if (attrs & (1ULL << OVS_KEY_ATTR_VLAN)) {
1366                 __be16 tci;
1367
1368                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1369                 if (!(tci & htons(VLAN_TAG_PRESENT))) {
1370                         if (is_mask)
1371                                 OVS_NLERR("VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.\n");
1372                         else
1373                                 OVS_NLERR("VLAN TCI does not have VLAN_TAG_PRESENT bit set.\n");
1374
1375                         return -EINVAL;
1376                 }
1377
1378                 SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
1379                 attrs &= ~(1ULL << OVS_KEY_ATTR_VLAN);
1380         } else if (!is_mask)
1381                 SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
1382
1383         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) {
1384                 __be16 eth_type;
1385
1386                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1387                 if (!is_mask && 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 }