datapath/flow_netlink.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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21 #include "flow.h"
  22 #include "datapath.h"
  23 #include <linux/uaccess.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/if_vlan.h>
  28 #include <net/llc_pdu.h>
  29 #include <linux/kernel.h>
  30 #include <linux/jhash.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/llc.h>
  33 #include <linux/module.h>
  34 #include <linux/in.h>
  35 #include <linux/rcupdate.h>
  36 #include <linux/if_arp.h>
  37 #include <linux/ip.h>
  38 #include <linux/ipv6.h>
  39 #include <linux/sctp.h>
  40 #include <linux/tcp.h>
  41 #include <linux/udp.h>
  42 #include <linux/icmp.h>
  43 #include <linux/icmpv6.h>
  44 #include <linux/rculist.h>
  45 #include <net/ip.h>
  46 #include <net/ip_tunnels.h>
  47 #include <net/ipv6.h>
  48 #include <net/ndisc.h>
  49
  50 #include "flow_netlink.h"
  51
  52 static void update_range__(struct sw_flow_match *match,
  53                            size_t offset, size_t size, bool is_mask)
  54 {
  55         struct sw_flow_key_range *range = NULL;
  56         size_t start = rounddown(offset, sizeof(long));
  57         size_t end = roundup(offset + size, sizeof(long));
  58
  59         if (!is_mask)
  60                 range = &match->range;
  61         else if (match->mask)
  62                 range = &match->mask->range;
  63
  64         if (!range)
  65                 return;
  66
  67         if (range->start == range->end) {
  68                 range->start = start;
  69                 range->end = end;
  70                 return;
  71         }
  72
  73         if (range->start > start)
  74                 range->start = start;
  75
  76         if (range->end < end)
  77                 range->end = end;
  78 }
  79
  80 #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
  81         do { \
  82                 update_range__(match, offsetof(struct sw_flow_key, field),  \
  83                                      sizeof((match)->key->field), is_mask); \
  84                 if (is_mask) {                                              \
  85                         if ((match)->mask)                                  \
  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) {                                              \
  97                         if ((match)->mask)                                  \
  98                                 memcpy(&(match)->mask->key.field, value_p, len);\
  99                 } else {                                                    \
 100                         memcpy(&(match)->key->field, value_p, len);         \
 101                 }                                                           \
 102         } while (0)
 103
 104 static u16 range_n_bytes(const struct sw_flow_key_range *range)
 105 {
 106         return range->end - range->start;
 107 }
 108
 109 static bool match_validate(const struct sw_flow_match *match,
 110                            u64 key_attrs, u64 mask_attrs)
 111 {
 112         u64 key_expected = 1ULL << OVS_KEY_ATTR_ETHERNET;
 113         u64 mask_allowed = key_attrs;  /* At most allow all key attributes */
 114
 115         /* The following mask attributes allowed only if they
 116          * pass the validation tests. */
 117         mask_allowed &= ~((1ULL << OVS_KEY_ATTR_IPV4)
 118                         | (1ULL << OVS_KEY_ATTR_IPV6)
 119                         | (1ULL << OVS_KEY_ATTR_TCP)
 120                         | (1ULL << OVS_KEY_ATTR_TCP_FLAGS)
 121                         | (1ULL << OVS_KEY_ATTR_UDP)
 122                         | (1ULL << OVS_KEY_ATTR_SCTP)
 123                         | (1ULL << OVS_KEY_ATTR_ICMP)
 124                         | (1ULL << OVS_KEY_ATTR_ICMPV6)
 125                         | (1ULL << OVS_KEY_ATTR_ARP)
 126                         | (1ULL << OVS_KEY_ATTR_ND));
 127
 128         /* Always allowed mask fields. */
 129         mask_allowed |= ((1ULL << OVS_KEY_ATTR_TUNNEL)
 130                        | (1ULL << OVS_KEY_ATTR_IN_PORT)
 131                        | (1ULL << OVS_KEY_ATTR_ETHERTYPE));
 132
 133         /* Check key attributes. */
 134         if (match->key->eth.type == htons(ETH_P_ARP)
 135                         || match->key->eth.type == htons(ETH_P_RARP)) {
 136                 key_expected |= 1ULL << OVS_KEY_ATTR_ARP;
 137                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 138                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ARP;
 139         }
 140
 141         if (match->key->eth.type == htons(ETH_P_IP)) {
 142                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV4;
 143                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 144                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV4;
 145
 146                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 147                         if (match->key->ip.proto == IPPROTO_UDP) {
 148                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 149                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 150                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 151                         }
 152
 153                         if (match->key->ip.proto == IPPROTO_SCTP) {
 154                                 key_expected |= 1ULL << OVS_KEY_ATTR_SCTP;
 155                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 156                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_SCTP;
 157                         }
 158
 159                         if (match->key->ip.proto == IPPROTO_TCP) {
 160                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 161                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 162                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 163                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 164                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 165                                 }
 166                         }
 167
 168                         if (match->key->ip.proto == IPPROTO_ICMP) {
 169                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMP;
 170                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 171                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMP;
 172                         }
 173                 }
 174         }
 175
 176         if (match->key->eth.type == htons(ETH_P_IPV6)) {
 177                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV6;
 178                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 179                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV6;
 180
 181                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 182                         if (match->key->ip.proto == IPPROTO_UDP) {
 183                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 184                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 185                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 186                         }
 187
 188                         if (match->key->ip.proto == IPPROTO_SCTP) {
 189                                 key_expected |= 1ULL << OVS_KEY_ATTR_SCTP;
 190                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 191                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_SCTP;
 192                         }
 193
 194                         if (match->key->ip.proto == IPPROTO_TCP) {
 195                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 196                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 197                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 198                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 199                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 200                                 }
 201                         }
 202
 203                         if (match->key->ip.proto == IPPROTO_ICMPV6) {
 204                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 205                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 206                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 207
 208                                 if (match->key->ipv6.tp.src ==
 209                                                 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 210                                     match->key->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 211                                         key_expected |= 1ULL << OVS_KEY_ATTR_ND;
 212                                         if (match->mask && (match->mask->key.ipv6.tp.src == htons(0xffff)))
 213                                                 mask_allowed |= 1ULL << OVS_KEY_ATTR_ND;
 214                                 }
 215                         }
 216                 }
 217         }
 218
 219         if ((key_attrs & key_expected) != key_expected) {
 220                 /* Key attributes check failed. */
 221                 OVS_NLERR("Missing expected key attributes (key_attrs=%llx, expected=%llx).\n",
 222                                 (unsigned long long)key_attrs, (unsigned long long)key_expected);
 223                 return false;
 224         }
 225
 226         if ((mask_attrs & mask_allowed) != mask_attrs) {
 227                 /* Mask attributes check failed. */
 228                 OVS_NLERR("Contain more than allowed mask fields (mask_attrs=%llx, mask_allowed=%llx).\n",
 229                                 (unsigned long long)mask_attrs, (unsigned long long)mask_allowed);
 230                 return false;
 231         }
 232
 233         return true;
 234 }
 235
 236 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
 237 static const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
 238         [OVS_KEY_ATTR_ENCAP] = -1,
 239         [OVS_KEY_ATTR_PRIORITY] = sizeof(u32),
 240         [OVS_KEY_ATTR_IN_PORT] = sizeof(u32),
 241         [OVS_KEY_ATTR_SKB_MARK] = sizeof(u32),
 242         [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet),
 243         [OVS_KEY_ATTR_VLAN] = sizeof(__be16),
 244         [OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16),
 245         [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
 246         [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
 247         [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
 248         [OVS_KEY_ATTR_TCP_FLAGS] = sizeof(__be16),
 249         [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
 250         [OVS_KEY_ATTR_SCTP] = sizeof(struct ovs_key_sctp),
 251         [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
 252         [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
 253         [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
 254         [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
 255         [OVS_KEY_ATTR_TUNNEL] = -1,
 256 };
 257
 258 static bool is_all_zero(const u8 *fp, size_t size)
 259 {
 260         int i;
 261
 262         if (!fp)
 263                 return false;
 264
 265         for (i = 0; i < size; i++)
 266                 if (fp[i])
 267                         return false;
 268
 269         return true;
 270 }
 271
 272 static int __parse_flow_nlattrs(const struct nlattr *attr,
 273                                 const struct nlattr *a[],
 274                                 u64 *attrsp, bool nz)
 275 {
 276         const struct nlattr *nla;
 277         u64 attrs;
 278         int rem;
 279
 280         attrs = *attrsp;
 281         nla_for_each_nested(nla, attr, rem) {
 282                 u16 type = nla_type(nla);
 283                 int expected_len;
 284
 285                 if (type > OVS_KEY_ATTR_MAX) {
 286                         OVS_NLERR("Unknown key attribute (type=%d, max=%d).\n",
 287                                   type, OVS_KEY_ATTR_MAX);
 288                         return -EINVAL;
 289                 }
 290
 291                 if (attrs & (1ULL << type)) {
 292                         OVS_NLERR("Duplicate key attribute (type %d).\n", type);
 293                         return -EINVAL;
 294                 }
 295
 296                 expected_len = ovs_key_lens[type];
 297                 if (nla_len(nla) != expected_len && expected_len != -1) {
 298                         OVS_NLERR("Key attribute has unexpected length (type=%d"
 299                                   ", length=%d, expected=%d).\n", type,
 300                                   nla_len(nla), expected_len);
 301                         return -EINVAL;
 302                 }
 303
 304                 if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
 305                         attrs |= 1ULL << type;
 306                         a[type] = nla;
 307                 }
 308         }
 309         if (rem) {
 310                 OVS_NLERR("Message has %d unknown bytes.\n", rem);
 311                 return -EINVAL;
 312         }
 313
 314         *attrsp = attrs;
 315         return 0;
 316 }
 317
 318 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
 319                                    const struct nlattr *a[], u64 *attrsp)
 320 {
 321         return __parse_flow_nlattrs(attr, a, attrsp, true);
 322 }
 323
 324 static int parse_flow_nlattrs(const struct nlattr *attr,
 325                               const struct nlattr *a[], u64 *attrsp)
 326 {
 327         return __parse_flow_nlattrs(attr, a, attrsp, false);
 328 }
 329
 330 static int ipv4_tun_from_nlattr(const struct nlattr *attr,
 331                                 struct sw_flow_match *match, bool is_mask)
 332 {
 333         struct nlattr *a;
 334         int rem;
 335         bool ttl = false;
 336         __be16 tun_flags = 0;
 337
 338         nla_for_each_nested(a, attr, rem) {
 339                 int type = nla_type(a);
 340                 static const u32 ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
 341                         [OVS_TUNNEL_KEY_ATTR_ID] = sizeof(u64),
 342                         [OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = sizeof(u32),
 343                         [OVS_TUNNEL_KEY_ATTR_IPV4_DST] = sizeof(u32),
 344                         [OVS_TUNNEL_KEY_ATTR_TOS] = 1,
 345                         [OVS_TUNNEL_KEY_ATTR_TTL] = 1,
 346                         [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = 0,
 347                         [OVS_TUNNEL_KEY_ATTR_CSUM] = 0,
 348                 };
 349
 350                 if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
 351                         OVS_NLERR("Unknown IPv4 tunnel attribute (type=%d, max=%d).\n",
 352                         type, OVS_TUNNEL_KEY_ATTR_MAX);
 353                         return -EINVAL;
 354                 }
 355
 356                 if (ovs_tunnel_key_lens[type] != nla_len(a)) {
 357                         OVS_NLERR("IPv4 tunnel attribute type has unexpected "
 358                                   " length (type=%d, length=%d, expected=%d).\n",
 359                                   type, nla_len(a), ovs_tunnel_key_lens[type]);
 360                         return -EINVAL;
 361                 }
 362
 363                 switch (type) {
 364                 case OVS_TUNNEL_KEY_ATTR_ID:
 365                         SW_FLOW_KEY_PUT(match, tun_key.tun_id,
 366                                         nla_get_be64(a), is_mask);
 367                         tun_flags |= TUNNEL_KEY;
 368                         break;
 369                 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
 370                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_src,
 371                                         nla_get_be32(a), is_mask);
 372                         break;
 373                 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
 374                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst,
 375                                         nla_get_be32(a), is_mask);
 376                         break;
 377                 case OVS_TUNNEL_KEY_ATTR_TOS:
 378                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos,
 379                                         nla_get_u8(a), is_mask);
 380                         break;
 381                 case OVS_TUNNEL_KEY_ATTR_TTL:
 382                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_ttl,
 383                                         nla_get_u8(a), is_mask);
 384                         ttl = true;
 385                         break;
 386                 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
 387                         tun_flags |= TUNNEL_DONT_FRAGMENT;
 388                         break;
 389                 case OVS_TUNNEL_KEY_ATTR_CSUM:
 390                         tun_flags |= TUNNEL_CSUM;
 391                         break;
 392                 default:
 393                         return -EINVAL;
 394                 }
 395         }
 396
 397         SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
 398
 399         if (rem > 0) {
 400                 OVS_NLERR("IPv4 tunnel attribute has %d unknown bytes.\n", rem);
 401                 return -EINVAL;
 402         }
 403
 404         if (!is_mask) {
 405                 if (!match->key->tun_key.ipv4_dst) {
 406                         OVS_NLERR("IPv4 tunnel destination address is zero.\n");
 407                         return -EINVAL;
 408                 }
 409
 410                 if (!ttl) {
 411                         OVS_NLERR("IPv4 tunnel TTL not specified.\n");
 412                         return -EINVAL;
 413                 }
 414         }
 415
 416         return 0;
 417 }
 418
 419 static int ipv4_tun_to_nlattr(struct sk_buff *skb,
 420                               const struct ovs_key_ipv4_tunnel *tun_key,
 421                               const struct ovs_key_ipv4_tunnel *output)
 422 {
 423         struct nlattr *nla;
 424
 425         nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
 426         if (!nla)
 427                 return -EMSGSIZE;
 428
 429         if (output->tun_flags & TUNNEL_KEY &&
 430             nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id))
 431                 return -EMSGSIZE;
 432         if (output->ipv4_src &&
 433                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src))
 434                 return -EMSGSIZE;
 435         if (output->ipv4_dst &&
 436                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst))
 437                 return -EMSGSIZE;
 438         if (output->ipv4_tos &&
 439                 nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->ipv4_tos))
 440                 return -EMSGSIZE;
 441         if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl))
 442                 return -EMSGSIZE;
 443         if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
 444                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
 445                 return -EMSGSIZE;
 446         if ((output->tun_flags & TUNNEL_CSUM) &&
 447                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
 448                 return -EMSGSIZE;
 449
 450         nla_nest_end(skb, nla);
 451         return 0;
 452 }
 453
 454
 455 static int metadata_from_nlattrs(struct sw_flow_match *match,  u64 *attrs,
 456                                  const struct nlattr **a, bool is_mask)
 457 {
 458         if (*attrs & (1ULL << OVS_KEY_ATTR_PRIORITY)) {
 459                 SW_FLOW_KEY_PUT(match, phy.priority,
 460                           nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
 461                 *attrs &= ~(1ULL << OVS_KEY_ATTR_PRIORITY);
 462         }
 463
 464         if (*attrs & (1ULL << OVS_KEY_ATTR_IN_PORT)) {
 465                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
 466
 467                 if (is_mask)
 468                         in_port = 0xffffffff; /* Always exact match in_port. */
 469                 else if (in_port >= DP_MAX_PORTS)
 470                         return -EINVAL;
 471
 472                 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
 473                 *attrs &= ~(1ULL << OVS_KEY_ATTR_IN_PORT);
 474         } else if (!is_mask) {
 475                 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
 476         }
 477
 478         if (*attrs & (1ULL << OVS_KEY_ATTR_SKB_MARK)) {
 479                 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
 480
 481                 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
 482                 *attrs &= ~(1ULL << OVS_KEY_ATTR_SKB_MARK);
 483         }
 484         if (*attrs & (1ULL << OVS_KEY_ATTR_TUNNEL)) {
 485                 if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
 486                                          is_mask))
 487                         return -EINVAL;
 488                 *attrs &= ~(1ULL << OVS_KEY_ATTR_TUNNEL);
 489         }
 490         return 0;
 491 }
 492
 493 static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
 494                                 const struct nlattr **a, bool is_mask)
 495 {
 496         int err;
 497         u64 orig_attrs = attrs;
 498
 499         err = metadata_from_nlattrs(match, &attrs, a, is_mask);
 500         if (err)
 501                 return err;
 502
 503         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) {
 504                 const struct ovs_key_ethernet *eth_key;
 505
 506                 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
 507                 SW_FLOW_KEY_MEMCPY(match, eth.src,
 508                                 eth_key->eth_src, ETH_ALEN, is_mask);
 509                 SW_FLOW_KEY_MEMCPY(match, eth.dst,
 510                                 eth_key->eth_dst, ETH_ALEN, is_mask);
 511                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERNET);
 512         }
 513
 514         if (attrs & (1ULL << OVS_KEY_ATTR_VLAN)) {
 515                 __be16 tci;
 516
 517                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 518                 if (!(tci & htons(VLAN_TAG_PRESENT))) {
 519                         if (is_mask)
 520                                 OVS_NLERR("VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.\n");
 521                         else
 522                                 OVS_NLERR("VLAN TCI does not have VLAN_TAG_PRESENT bit set.\n");
 523
 524                         return -EINVAL;
 525                 }
 526
 527                 SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
 528                 attrs &= ~(1ULL << OVS_KEY_ATTR_VLAN);
 529         } else if (!is_mask)
 530                 SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
 531
 532         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) {
 533                 __be16 eth_type;
 534
 535                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 536                 if (is_mask) {
 537                         /* Always exact match EtherType. */
 538                         eth_type = htons(0xffff);
 539                 } else if (ntohs(eth_type) < ETH_P_802_3_MIN) {
 540                         OVS_NLERR("EtherType is less than minimum (type=%x, min=%x).\n",
 541                                         ntohs(eth_type), ETH_P_802_3_MIN);
 542                         return -EINVAL;
 543                 }
 544
 545                 SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
 546                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 547         } else if (!is_mask) {
 548                 SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
 549         }
 550
 551         if (attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 552                 const struct ovs_key_ipv4 *ipv4_key;
 553
 554                 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
 555                 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
 556                         OVS_NLERR("Unknown IPv4 fragment type (value=%d, max=%d).\n",
 557                                 ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
 558                         return -EINVAL;
 559                 }
 560                 SW_FLOW_KEY_PUT(match, ip.proto,
 561                                 ipv4_key->ipv4_proto, is_mask);
 562                 SW_FLOW_KEY_PUT(match, ip.tos,
 563                                 ipv4_key->ipv4_tos, is_mask);
 564                 SW_FLOW_KEY_PUT(match, ip.ttl,
 565                                 ipv4_key->ipv4_ttl, is_mask);
 566                 SW_FLOW_KEY_PUT(match, ip.frag,
 567                                 ipv4_key->ipv4_frag, is_mask);
 568                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 569                                 ipv4_key->ipv4_src, is_mask);
 570                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 571                                 ipv4_key->ipv4_dst, is_mask);
 572                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV4);
 573         }
 574
 575         if (attrs & (1ULL << OVS_KEY_ATTR_IPV6)) {
 576                 const struct ovs_key_ipv6 *ipv6_key;
 577
 578                 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
 579                 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
 580                         OVS_NLERR("Unknown IPv6 fragment type (value=%d, max=%d).\n",
 581                                 ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
 582                         return -EINVAL;
 583                 }
 584                 SW_FLOW_KEY_PUT(match, ipv6.label,
 585                                 ipv6_key->ipv6_label, is_mask);
 586                 SW_FLOW_KEY_PUT(match, ip.proto,
 587                                 ipv6_key->ipv6_proto, is_mask);
 588                 SW_FLOW_KEY_PUT(match, ip.tos,
 589                                 ipv6_key->ipv6_tclass, is_mask);
 590                 SW_FLOW_KEY_PUT(match, ip.ttl,
 591                                 ipv6_key->ipv6_hlimit, is_mask);
 592                 SW_FLOW_KEY_PUT(match, ip.frag,
 593                                 ipv6_key->ipv6_frag, is_mask);
 594                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
 595                                 ipv6_key->ipv6_src,
 596                                 sizeof(match->key->ipv6.addr.src),
 597                                 is_mask);
 598                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
 599                                 ipv6_key->ipv6_dst,
 600                                 sizeof(match->key->ipv6.addr.dst),
 601                                 is_mask);
 602
 603                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV6);
 604         }
 605
 606         if (attrs & (1ULL << OVS_KEY_ATTR_ARP)) {
 607                 const struct ovs_key_arp *arp_key;
 608
 609                 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
 610                 if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
 611                         OVS_NLERR("Unknown ARP opcode (opcode=%d).\n",
 612                                   arp_key->arp_op);
 613                         return -EINVAL;
 614                 }
 615
 616                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 617                                 arp_key->arp_sip, is_mask);
 618                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 619                         arp_key->arp_tip, is_mask);
 620                 SW_FLOW_KEY_PUT(match, ip.proto,
 621                                 ntohs(arp_key->arp_op), is_mask);
 622                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
 623                                 arp_key->arp_sha, ETH_ALEN, is_mask);
 624                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
 625                                 arp_key->arp_tha, ETH_ALEN, is_mask);
 626
 627                 attrs &= ~(1ULL << OVS_KEY_ATTR_ARP);
 628         }
 629
 630         if (attrs & (1ULL << OVS_KEY_ATTR_TCP)) {
 631                 const struct ovs_key_tcp *tcp_key;
 632
 633                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
 634                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 635                         SW_FLOW_KEY_PUT(match, ipv4.tp.src,
 636                                         tcp_key->tcp_src, is_mask);
 637                         SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
 638                                         tcp_key->tcp_dst, is_mask);
 639                 } else {
 640                         SW_FLOW_KEY_PUT(match, ipv6.tp.src,
 641                                         tcp_key->tcp_src, is_mask);
 642                         SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
 643                                         tcp_key->tcp_dst, is_mask);
 644                 }
 645                 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP);
 646         }
 647
 648         if (attrs & (1ULL << OVS_KEY_ATTR_TCP_FLAGS)) {
 649                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 650                         SW_FLOW_KEY_PUT(match, ipv4.tp.flags,
 651                                         nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
 652                                         is_mask);
 653                 } else {
 654                         SW_FLOW_KEY_PUT(match, ipv6.tp.flags,
 655                                         nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
 656                                         is_mask);
 657                 }
 658                 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP_FLAGS);
 659         }
 660
 661         if (attrs & (1ULL << OVS_KEY_ATTR_UDP)) {
 662                 const struct ovs_key_udp *udp_key;
 663
 664                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
 665                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 666                         SW_FLOW_KEY_PUT(match, ipv4.tp.src,
 667                                         udp_key->udp_src, is_mask);
 668                         SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
 669                                         udp_key->udp_dst, is_mask);
 670                 } else {
 671                         SW_FLOW_KEY_PUT(match, ipv6.tp.src,
 672                                         udp_key->udp_src, is_mask);
 673                         SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
 674                                         udp_key->udp_dst, is_mask);
 675                 }
 676                 attrs &= ~(1ULL << OVS_KEY_ATTR_UDP);
 677         }
 678
 679         if (attrs & (1ULL << OVS_KEY_ATTR_SCTP)) {
 680                 const struct ovs_key_sctp *sctp_key;
 681
 682                 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
 683                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 684                         SW_FLOW_KEY_PUT(match, ipv4.tp.src,
 685                                         sctp_key->sctp_src, is_mask);
 686                         SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
 687                                         sctp_key->sctp_dst, is_mask);
 688                 } else {
 689                         SW_FLOW_KEY_PUT(match, ipv6.tp.src,
 690                                         sctp_key->sctp_src, is_mask);
 691                         SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
 692                                         sctp_key->sctp_dst, is_mask);
 693                 }
 694                 attrs &= ~(1ULL << OVS_KEY_ATTR_SCTP);
 695         }
 696
 697         if (attrs & (1ULL << OVS_KEY_ATTR_ICMP)) {
 698                 const struct ovs_key_icmp *icmp_key;
 699
 700                 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
 701                 SW_FLOW_KEY_PUT(match, ipv4.tp.src,
 702                                 htons(icmp_key->icmp_type), is_mask);
 703                 SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
 704                                 htons(icmp_key->icmp_code), is_mask);
 705                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMP);
 706         }
 707
 708         if (attrs & (1ULL << OVS_KEY_ATTR_ICMPV6)) {
 709                 const struct ovs_key_icmpv6 *icmpv6_key;
 710
 711                 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
 712                 SW_FLOW_KEY_PUT(match, ipv6.tp.src,
 713                                 htons(icmpv6_key->icmpv6_type), is_mask);
 714                 SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
 715                                 htons(icmpv6_key->icmpv6_code), is_mask);
 716                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMPV6);
 717         }
 718
 719         if (attrs & (1ULL << OVS_KEY_ATTR_ND)) {
 720                 const struct ovs_key_nd *nd_key;
 721
 722                 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
 723                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
 724                         nd_key->nd_target,
 725                         sizeof(match->key->ipv6.nd.target),
 726                         is_mask);
 727                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
 728                         nd_key->nd_sll, ETH_ALEN, is_mask);
 729                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
 730                                 nd_key->nd_tll, ETH_ALEN, is_mask);
 731                 attrs &= ~(1ULL << OVS_KEY_ATTR_ND);
 732         }
 733
 734         if (attrs != 0)
 735                 return -EINVAL;
 736
 737         return 0;
 738 }
 739
 740 static void sw_flow_mask_set(struct sw_flow_mask *mask,
 741                              struct sw_flow_key_range *range, u8 val)
 742 {
 743         u8 *m = (u8 *)&mask->key + range->start;
 744
 745         mask->range = *range;
 746         memset(m, val, range_n_bytes(range));
 747 }
 748
 749 /**
 750  * ovs_nla_get_match - parses Netlink attributes into a flow key and
 751  * mask. In case the 'mask' is NULL, the flow is treated as exact match
 752  * flow. Otherwise, it is treated as a wildcarded flow, except the mask
 753  * does not include any don't care bit.
 754  * @match: receives the extracted flow match information.
 755  * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
 756  * sequence. The fields should of the packet that triggered the creation
 757  * of this flow.
 758  * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
 759  * attribute specifies the mask field of the wildcarded flow.
 760  */
 761 int ovs_nla_get_match(struct sw_flow_match *match,
 762                       const struct nlattr *key,
 763                       const struct nlattr *mask)
 764 {
 765         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
 766         const struct nlattr *encap;
 767         u64 key_attrs = 0;
 768         u64 mask_attrs = 0;
 769         bool encap_valid = false;
 770         int err;
 771
 772         err = parse_flow_nlattrs(key, a, &key_attrs);
 773         if (err)
 774                 return err;
 775
 776         if ((key_attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) &&
 777             (key_attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) &&
 778             (nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
 779                 __be16 tci;
 780
 781                 if (!((key_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) &&
 782                       (key_attrs & (1ULL << OVS_KEY_ATTR_ENCAP)))) {
 783                         OVS_NLERR("Invalid Vlan frame.\n");
 784                         return -EINVAL;
 785                 }
 786
 787                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 788                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 789                 encap = a[OVS_KEY_ATTR_ENCAP];
 790                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
 791                 encap_valid = true;
 792
 793                 if (tci & htons(VLAN_TAG_PRESENT)) {
 794                         err = parse_flow_nlattrs(encap, a, &key_attrs);
 795                         if (err)
 796                                 return err;
 797                 } else if (!tci) {
 798                         /* Corner case for truncated 802.1Q header. */
 799                         if (nla_len(encap)) {
 800                                 OVS_NLERR("Truncated 802.1Q header has non-zero encap attribute.\n");
 801                                 return -EINVAL;
 802                         }
 803                 } else {
 804                         OVS_NLERR("Encap attribute is set for a non-VLAN frame.\n");
 805                         return  -EINVAL;
 806                 }
 807         }
 808
 809         err = ovs_key_from_nlattrs(match, key_attrs, a, false);
 810         if (err)
 811                 return err;
 812
 813         if (mask) {
 814                 err = parse_flow_mask_nlattrs(mask, a, &mask_attrs);
 815                 if (err)
 816                         return err;
 817
 818                 if (mask_attrs & 1ULL << OVS_KEY_ATTR_ENCAP)  {
 819                         __be16 eth_type = 0;
 820                         __be16 tci = 0;
 821
 822                         if (!encap_valid) {
 823                                 OVS_NLERR("Encap mask attribute is set for non-VLAN frame.\n");
 824                                 return  -EINVAL;
 825                         }
 826
 827                         mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
 828                         if (a[OVS_KEY_ATTR_ETHERTYPE])
 829                                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 830
 831                         if (eth_type == htons(0xffff)) {
 832                                 mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 833                                 encap = a[OVS_KEY_ATTR_ENCAP];
 834                                 err = parse_flow_mask_nlattrs(encap, a, &mask_attrs);
 835                         } else {
 836                                 OVS_NLERR("VLAN frames must have an exact match on the TPID (mask=%x).\n",
 837                                                 ntohs(eth_type));
 838                                 return -EINVAL;
 839                         }
 840
 841                         if (a[OVS_KEY_ATTR_VLAN])
 842                                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 843
 844                         if (!(tci & htons(VLAN_TAG_PRESENT))) {
 845                                 OVS_NLERR("VLAN tag present bit must have an exact match (tci_mask=%x).\n", ntohs(tci));
 846                                 return -EINVAL;
 847                         }
 848                 }
 849
 850                 err = ovs_key_from_nlattrs(match, mask_attrs, a, true);
 851                 if (err)
 852                         return err;
 853         } else {
 854                 /* Populate exact match flow's key mask. */
 855                 if (match->mask)
 856                         sw_flow_mask_set(match->mask, &match->range, 0xff);
 857         }
 858
 859         if (!match_validate(match, key_attrs, mask_attrs))
 860                 return -EINVAL;
 861
 862         return 0;
 863 }
 864
 865 /**
 866  * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
 867  * @flow: Receives extracted in_port, priority, tun_key and skb_mark.
 868  * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
 869  * sequence.
 870  *
 871  * This parses a series of Netlink attributes that form a flow key, which must
 872  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
 873  * get the metadata, that is, the parts of the flow key that cannot be
 874  * extracted from the packet itself.
 875  */
 876
 877 int ovs_nla_get_flow_metadata(struct sw_flow *flow,
 878                               const struct nlattr *attr)
 879 {
 880         struct ovs_key_ipv4_tunnel *tun_key = &flow->key.tun_key;
 881         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
 882         u64 attrs = 0;
 883         int err;
 884         struct sw_flow_match match;
 885
 886         flow->key.phy.in_port = DP_MAX_PORTS;
 887         flow->key.phy.priority = 0;
 888         flow->key.phy.skb_mark = 0;
 889         memset(tun_key, 0, sizeof(flow->key.tun_key));
 890
 891         err = parse_flow_nlattrs(attr, a, &attrs);
 892         if (err)
 893                 return -EINVAL;
 894
 895         memset(&match, 0, sizeof(match));
 896         match.key = &flow->key;
 897
 898         err = metadata_from_nlattrs(&match, &attrs, a, false);
 899         if (err)
 900                 return err;
 901
 902         return 0;
 903 }
 904
 905 int ovs_nla_put_flow(const struct sw_flow_key *swkey,
 906                      const struct sw_flow_key *output, struct sk_buff *skb)
 907 {
 908         struct ovs_key_ethernet *eth_key;
 909         struct nlattr *nla, *encap;
 910         bool is_mask = (swkey != output);
 911
 912         if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
 913                 goto nla_put_failure;
 914
 915         if ((swkey->tun_key.ipv4_dst || is_mask) &&
 916             ipv4_tun_to_nlattr(skb, &swkey->tun_key, &output->tun_key))
 917                 goto nla_put_failure;
 918
 919         if (swkey->phy.in_port == DP_MAX_PORTS) {
 920                 if (is_mask && (output->phy.in_port == 0xffff))
 921                         if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
 922                                 goto nla_put_failure;
 923         } else {
 924                 u16 upper_u16;
 925                 upper_u16 = !is_mask ? 0 : 0xffff;
 926
 927                 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
 928                                 (upper_u16 << 16) | output->phy.in_port))
 929                         goto nla_put_failure;
 930         }
 931
 932         if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
 933                 goto nla_put_failure;
 934
 935         nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
 936         if (!nla)
 937                 goto nla_put_failure;
 938
 939         eth_key = nla_data(nla);
 940         ether_addr_copy(eth_key->eth_src, output->eth.src);
 941         ether_addr_copy(eth_key->eth_dst, output->eth.dst);
 942
 943         if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
 944                 __be16 eth_type;
 945                 eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff);
 946                 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
 947                     nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
 948                         goto nla_put_failure;
 949                 encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
 950                 if (!swkey->eth.tci)
 951                         goto unencap;
 952         } else
 953                 encap = NULL;
 954
 955         if (swkey->eth.type == htons(ETH_P_802_2)) {
 956                 /*
 957                  * Ethertype 802.2 is represented in the netlink with omitted
 958                  * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
 959                  * 0xffff in the mask attribute.  Ethertype can also
 960                  * be wildcarded.
 961                  */
 962                 if (is_mask && output->eth.type)
 963                         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
 964                                                 output->eth.type))
 965                                 goto nla_put_failure;
 966                 goto unencap;
 967         }
 968
 969         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
 970                 goto nla_put_failure;
 971
 972         if (swkey->eth.type == htons(ETH_P_IP)) {
 973                 struct ovs_key_ipv4 *ipv4_key;
 974
 975                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
 976                 if (!nla)
 977                         goto nla_put_failure;
 978                 ipv4_key = nla_data(nla);
 979                 ipv4_key->ipv4_src = output->ipv4.addr.src;
 980                 ipv4_key->ipv4_dst = output->ipv4.addr.dst;
 981                 ipv4_key->ipv4_proto = output->ip.proto;
 982                 ipv4_key->ipv4_tos = output->ip.tos;
 983                 ipv4_key->ipv4_ttl = output->ip.ttl;
 984                 ipv4_key->ipv4_frag = output->ip.frag;
 985         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
 986                 struct ovs_key_ipv6 *ipv6_key;
 987
 988                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
 989                 if (!nla)
 990                         goto nla_put_failure;
 991                 ipv6_key = nla_data(nla);
 992                 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
 993                                 sizeof(ipv6_key->ipv6_src));
 994                 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
 995                                 sizeof(ipv6_key->ipv6_dst));
 996                 ipv6_key->ipv6_label = output->ipv6.label;
 997                 ipv6_key->ipv6_proto = output->ip.proto;
 998                 ipv6_key->ipv6_tclass = output->ip.tos;
 999                 ipv6_key->ipv6_hlimit = output->ip.ttl;
1000                 ipv6_key->ipv6_frag = output->ip.frag;
1001         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
1002                    swkey->eth.type == htons(ETH_P_RARP)) {
1003                 struct ovs_key_arp *arp_key;
1004
1005                 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
1006                 if (!nla)
1007                         goto nla_put_failure;
1008                 arp_key = nla_data(nla);
1009                 memset(arp_key, 0, sizeof(struct ovs_key_arp));
1010                 arp_key->arp_sip = output->ipv4.addr.src;
1011                 arp_key->arp_tip = output->ipv4.addr.dst;
1012                 arp_key->arp_op = htons(output->ip.proto);
1013                 ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha);
1014                 ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha);
1015         }
1016
1017         if ((swkey->eth.type == htons(ETH_P_IP) ||
1018              swkey->eth.type == htons(ETH_P_IPV6)) &&
1019              swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1020
1021                 if (swkey->ip.proto == IPPROTO_TCP) {
1022                         struct ovs_key_tcp *tcp_key;
1023
1024                         nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
1025                         if (!nla)
1026                                 goto nla_put_failure;
1027                         tcp_key = nla_data(nla);
1028                         if (swkey->eth.type == htons(ETH_P_IP)) {
1029                                 tcp_key->tcp_src = output->ipv4.tp.src;
1030                                 tcp_key->tcp_dst = output->ipv4.tp.dst;
1031                                 if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
1032                                                  output->ipv4.tp.flags))
1033                                         goto nla_put_failure;
1034                         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1035                                 tcp_key->tcp_src = output->ipv6.tp.src;
1036                                 tcp_key->tcp_dst = output->ipv6.tp.dst;
1037                                 if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
1038                                                  output->ipv6.tp.flags))
1039                                         goto nla_put_failure;
1040                         }
1041                 } else if (swkey->ip.proto == IPPROTO_UDP) {
1042                         struct ovs_key_udp *udp_key;
1043
1044                         nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
1045                         if (!nla)
1046                                 goto nla_put_failure;
1047                         udp_key = nla_data(nla);
1048                         if (swkey->eth.type == htons(ETH_P_IP)) {
1049                                 udp_key->udp_src = output->ipv4.tp.src;
1050                                 udp_key->udp_dst = output->ipv4.tp.dst;
1051                         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1052                                 udp_key->udp_src = output->ipv6.tp.src;
1053                                 udp_key->udp_dst = output->ipv6.tp.dst;
1054                         }
1055                 } else if (swkey->ip.proto == IPPROTO_SCTP) {
1056                         struct ovs_key_sctp *sctp_key;
1057
1058                         nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
1059                         if (!nla)
1060                                 goto nla_put_failure;
1061                         sctp_key = nla_data(nla);
1062                         if (swkey->eth.type == htons(ETH_P_IP)) {
1063                                 sctp_key->sctp_src = swkey->ipv4.tp.src;
1064                                 sctp_key->sctp_dst = swkey->ipv4.tp.dst;
1065                         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1066                                 sctp_key->sctp_src = swkey->ipv6.tp.src;
1067                                 sctp_key->sctp_dst = swkey->ipv6.tp.dst;
1068                         }
1069                 } else if (swkey->eth.type == htons(ETH_P_IP) &&
1070                            swkey->ip.proto == IPPROTO_ICMP) {
1071                         struct ovs_key_icmp *icmp_key;
1072
1073                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
1074                         if (!nla)
1075                                 goto nla_put_failure;
1076                         icmp_key = nla_data(nla);
1077                         icmp_key->icmp_type = ntohs(output->ipv4.tp.src);
1078                         icmp_key->icmp_code = ntohs(output->ipv4.tp.dst);
1079                 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
1080                            swkey->ip.proto == IPPROTO_ICMPV6) {
1081                         struct ovs_key_icmpv6 *icmpv6_key;
1082
1083                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
1084                                                 sizeof(*icmpv6_key));
1085                         if (!nla)
1086                                 goto nla_put_failure;
1087                         icmpv6_key = nla_data(nla);
1088                         icmpv6_key->icmpv6_type = ntohs(output->ipv6.tp.src);
1089                         icmpv6_key->icmpv6_code = ntohs(output->ipv6.tp.dst);
1090
1091                         if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
1092                             icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
1093                                 struct ovs_key_nd *nd_key;
1094
1095                                 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
1096                                 if (!nla)
1097                                         goto nla_put_failure;
1098                                 nd_key = nla_data(nla);
1099                                 memcpy(nd_key->nd_target, &output->ipv6.nd.target,
1100                                                         sizeof(nd_key->nd_target));
1101                                 ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll);
1102                                 ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll);
1103                         }
1104                 }
1105         }
1106
1107 unencap:
1108         if (encap)
1109                 nla_nest_end(skb, encap);
1110
1111         return 0;
1112
1113 nla_put_failure:
1114         return -EMSGSIZE;
1115 }
1116
1117 #define MAX_ACTIONS_BUFSIZE     (32 * 1024)
1118
1119 struct sw_flow_actions *ovs_nla_alloc_flow_actions(int size)
1120 {
1121         struct sw_flow_actions *sfa;
1122
1123         if (size > MAX_ACTIONS_BUFSIZE)
1124                 return ERR_PTR(-EINVAL);
1125
1126         sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
1127         if (!sfa)
1128                 return ERR_PTR(-ENOMEM);
1129
1130         sfa->actions_len = 0;
1131         return sfa;
1132 }
1133
1134 /* RCU callback used by ovs_nla_free_flow_actions. */
1135 static void rcu_free_acts_callback(struct rcu_head *rcu)
1136 {
1137         struct sw_flow_actions *sf_acts = container_of(rcu,
1138                         struct sw_flow_actions, rcu);
1139         kfree(sf_acts);
1140 }
1141
1142 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
1143  * The caller must hold rcu_read_lock for this to be sensible. */
1144 void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
1145 {
1146         call_rcu(&sf_acts->rcu, rcu_free_acts_callback);
1147 }
1148
1149 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
1150                                        int attr_len)
1151 {
1152
1153         struct sw_flow_actions *acts;
1154         int new_acts_size;
1155         int req_size = NLA_ALIGN(attr_len);
1156         int next_offset = offsetof(struct sw_flow_actions, actions) +
1157                                         (*sfa)->actions_len;
1158
1159         if (req_size <= (ksize(*sfa) - next_offset))
1160                 goto out;
1161
1162         new_acts_size = ksize(*sfa) * 2;
1163
1164         if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
1165                 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
1166                         return ERR_PTR(-EMSGSIZE);
1167                 new_acts_size = MAX_ACTIONS_BUFSIZE;
1168         }
1169
1170         acts = ovs_nla_alloc_flow_actions(new_acts_size);
1171         if (IS_ERR(acts))
1172                 return (void *)acts;
1173
1174         memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
1175         acts->actions_len = (*sfa)->actions_len;
1176         kfree(*sfa);
1177         *sfa = acts;
1178
1179 out:
1180         (*sfa)->actions_len += req_size;
1181         return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
1182 }
1183
1184 static int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len)
1185 {
1186         struct nlattr *a;
1187
1188         a = reserve_sfa_size(sfa, nla_attr_size(len));
1189         if (IS_ERR(a))
1190                 return PTR_ERR(a);
1191
1192         a->nla_type = attrtype;
1193         a->nla_len = nla_attr_size(len);
1194
1195         if (data)
1196                 memcpy(nla_data(a), data, len);
1197         memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
1198
1199         return 0;
1200 }
1201
1202 static inline int add_nested_action_start(struct sw_flow_actions **sfa,
1203                                           int attrtype)
1204 {
1205         int used = (*sfa)->actions_len;
1206         int err;
1207
1208         err = add_action(sfa, attrtype, NULL, 0);
1209         if (err)
1210                 return err;
1211
1212         return used;
1213 }
1214
1215 static inline void add_nested_action_end(struct sw_flow_actions *sfa,
1216                                          int st_offset)
1217 {
1218         struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
1219                                                                st_offset);
1220
1221         a->nla_len = sfa->actions_len - st_offset;
1222 }
1223
1224 static int validate_and_copy_sample(const struct nlattr *attr,
1225                                     const struct sw_flow_key *key, int depth,
1226                                     struct sw_flow_actions **sfa)
1227 {
1228         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
1229         const struct nlattr *probability, *actions;
1230         const struct nlattr *a;
1231         int rem, start, err, st_acts;
1232
1233         memset(attrs, 0, sizeof(attrs));
1234         nla_for_each_nested(a, attr, rem) {
1235                 int type = nla_type(a);
1236                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
1237                         return -EINVAL;
1238                 attrs[type] = a;
1239         }
1240         if (rem)
1241                 return -EINVAL;
1242
1243         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
1244         if (!probability || nla_len(probability) != sizeof(u32))
1245                 return -EINVAL;
1246
1247         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
1248         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
1249                 return -EINVAL;
1250
1251         /* validation done, copy sample action. */
1252         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE);
1253         if (start < 0)
1254                 return start;
1255         err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY,
1256                          nla_data(probability), sizeof(u32));
1257         if (err)
1258                 return err;
1259         st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
1260         if (st_acts < 0)
1261                 return st_acts;
1262
1263         err = ovs_nla_copy_actions(actions, key, depth + 1, sfa);
1264         if (err)
1265                 return err;
1266
1267         add_nested_action_end(*sfa, st_acts);
1268         add_nested_action_end(*sfa, start);
1269
1270         return 0;
1271 }
1272
1273 static int validate_tp_port(const struct sw_flow_key *flow_key)
1274 {
1275         if (flow_key->eth.type == htons(ETH_P_IP)) {
1276                 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
1277                         return 0;
1278         } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
1279                 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
1280                         return 0;
1281         }
1282
1283         return -EINVAL;
1284 }
1285
1286 void ovs_match_init(struct sw_flow_match *match,
1287                     struct sw_flow_key *key,
1288                     struct sw_flow_mask *mask)
1289 {
1290         memset(match, 0, sizeof(*match));
1291         match->key = key;
1292         match->mask = mask;
1293
1294         memset(key, 0, sizeof(*key));
1295
1296         if (mask) {
1297                 memset(&mask->key, 0, sizeof(mask->key));
1298                 mask->range.start = mask->range.end = 0;
1299         }
1300 }
1301
1302 static int validate_and_copy_set_tun(const struct nlattr *attr,
1303                                      struct sw_flow_actions **sfa)
1304 {
1305         struct sw_flow_match match;
1306         struct sw_flow_key key;
1307         int err, start;
1308
1309         ovs_match_init(&match, &key, NULL);
1310         err = ipv4_tun_from_nlattr(nla_data(attr), &match, false);
1311         if (err)
1312                 return err;
1313
1314         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
1315         if (start < 0)
1316                 return start;
1317
1318         err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &match.key->tun_key,
1319                         sizeof(match.key->tun_key));
1320         add_nested_action_end(*sfa, start);
1321
1322         return err;
1323 }
1324
1325 static int validate_set(const struct nlattr *a,
1326                         const struct sw_flow_key *flow_key,
1327                         struct sw_flow_actions **sfa,
1328                         bool *set_tun)
1329 {
1330         const struct nlattr *ovs_key = nla_data(a);
1331         int key_type = nla_type(ovs_key);
1332
1333         /* There can be only one key in a action */
1334         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
1335                 return -EINVAL;
1336
1337         if (key_type > OVS_KEY_ATTR_MAX ||
1338             (ovs_key_lens[key_type] != nla_len(ovs_key) &&
1339              ovs_key_lens[key_type] != -1))
1340                 return -EINVAL;
1341
1342         switch (key_type) {
1343         const struct ovs_key_ipv4 *ipv4_key;
1344         const struct ovs_key_ipv6 *ipv6_key;
1345         int err;
1346
1347         case OVS_KEY_ATTR_PRIORITY:
1348         case OVS_KEY_ATTR_SKB_MARK:
1349         case OVS_KEY_ATTR_ETHERNET:
1350                 break;
1351
1352         case OVS_KEY_ATTR_TUNNEL:
1353                 *set_tun = true;
1354                 err = validate_and_copy_set_tun(a, sfa);
1355                 if (err)
1356                         return err;
1357                 break;
1358
1359         case OVS_KEY_ATTR_IPV4:
1360                 if (flow_key->eth.type != htons(ETH_P_IP))
1361                         return -EINVAL;
1362
1363                 if (!flow_key->ip.proto)
1364                         return -EINVAL;
1365
1366                 ipv4_key = nla_data(ovs_key);
1367                 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
1368                         return -EINVAL;
1369
1370                 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
1371                         return -EINVAL;
1372
1373                 break;
1374
1375         case OVS_KEY_ATTR_IPV6:
1376                 if (flow_key->eth.type != htons(ETH_P_IPV6))
1377                         return -EINVAL;
1378
1379                 if (!flow_key->ip.proto)
1380                         return -EINVAL;
1381
1382                 ipv6_key = nla_data(ovs_key);
1383                 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
1384                         return -EINVAL;
1385
1386                 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
1387                         return -EINVAL;
1388
1389                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
1390                         return -EINVAL;
1391
1392                 break;
1393
1394         case OVS_KEY_ATTR_TCP:
1395                 if (flow_key->ip.proto != IPPROTO_TCP)
1396                         return -EINVAL;
1397
1398                 return validate_tp_port(flow_key);
1399
1400         case OVS_KEY_ATTR_UDP:
1401                 if (flow_key->ip.proto != IPPROTO_UDP)
1402                         return -EINVAL;
1403
1404                 return validate_tp_port(flow_key);
1405
1406         case OVS_KEY_ATTR_SCTP:
1407                 if (flow_key->ip.proto != IPPROTO_SCTP)
1408                         return -EINVAL;
1409
1410                 return validate_tp_port(flow_key);
1411
1412         default:
1413                 return -EINVAL;
1414         }
1415
1416         return 0;
1417 }
1418
1419 static int validate_userspace(const struct nlattr *attr)
1420 {
1421         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
1422                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
1423                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
1424         };
1425         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
1426         int error;
1427
1428         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
1429                                  attr, userspace_policy);
1430         if (error)
1431                 return error;
1432
1433         if (!a[OVS_USERSPACE_ATTR_PID] ||
1434             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
1435                 return -EINVAL;
1436
1437         return 0;
1438 }
1439
1440 static int copy_action(const struct nlattr *from,
1441                        struct sw_flow_actions **sfa)
1442 {
1443         int totlen = NLA_ALIGN(from->nla_len);
1444         struct nlattr *to;
1445
1446         to = reserve_sfa_size(sfa, from->nla_len);
1447         if (IS_ERR(to))
1448                 return PTR_ERR(to);
1449
1450         memcpy(to, from, totlen);
1451         return 0;
1452 }
1453
1454 int ovs_nla_copy_actions(const struct nlattr *attr,
1455                          const struct sw_flow_key *key,
1456                          int depth,
1457                          struct sw_flow_actions **sfa)
1458 {
1459         const struct nlattr *a;
1460         int rem, err;
1461
1462         if (depth >= SAMPLE_ACTION_DEPTH)
1463                 return -EOVERFLOW;
1464
1465         nla_for_each_nested(a, attr, rem) {
1466                 /* Expected argument lengths, (u32)-1 for variable length. */
1467                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
1468                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
1469                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
1470                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
1471                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
1472                         [OVS_ACTION_ATTR_SET] = (u32)-1,
1473                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
1474                 };
1475                 const struct ovs_action_push_vlan *vlan;
1476                 int type = nla_type(a);
1477                 bool skip_copy;
1478
1479                 if (type > OVS_ACTION_ATTR_MAX ||
1480                     (action_lens[type] != nla_len(a) &&
1481                      action_lens[type] != (u32)-1))
1482                         return -EINVAL;
1483
1484                 skip_copy = false;
1485                 switch (type) {
1486                 case OVS_ACTION_ATTR_UNSPEC:
1487                         return -EINVAL;
1488
1489                 case OVS_ACTION_ATTR_USERSPACE:
1490                         err = validate_userspace(a);
1491                         if (err)
1492                                 return err;
1493                         break;
1494
1495                 case OVS_ACTION_ATTR_OUTPUT:
1496                         if (nla_get_u32(a) >= DP_MAX_PORTS)
1497                                 return -EINVAL;
1498                         break;
1499
1500
1501                 case OVS_ACTION_ATTR_POP_VLAN:
1502                         break;
1503
1504                 case OVS_ACTION_ATTR_PUSH_VLAN:
1505                         vlan = nla_data(a);
1506                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
1507                                 return -EINVAL;
1508                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
1509                                 return -EINVAL;
1510                         break;
1511
1512                 case OVS_ACTION_ATTR_SET:
1513                         err = validate_set(a, key, sfa, &skip_copy);
1514                         if (err)
1515                                 return err;
1516                         break;
1517
1518                 case OVS_ACTION_ATTR_SAMPLE:
1519                         err = validate_and_copy_sample(a, key, depth, sfa);
1520                         if (err)
1521                                 return err;
1522                         skip_copy = true;
1523                         break;
1524
1525                 default:
1526                         return -EINVAL;
1527                 }
1528                 if (!skip_copy) {
1529                         err = copy_action(a, sfa);
1530                         if (err)
1531                                 return err;
1532                 }
1533         }
1534
1535         if (rem > 0)
1536                 return -EINVAL;
1537
1538         return 0;
1539 }
1540
1541 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
1542 {
1543         const struct nlattr *a;
1544         struct nlattr *start;
1545         int err = 0, rem;
1546
1547         start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
1548         if (!start)
1549                 return -EMSGSIZE;
1550
1551         nla_for_each_nested(a, attr, rem) {
1552                 int type = nla_type(a);
1553                 struct nlattr *st_sample;
1554
1555                 switch (type) {
1556                 case OVS_SAMPLE_ATTR_PROBABILITY:
1557                         if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY,
1558                                     sizeof(u32), nla_data(a)))
1559                                 return -EMSGSIZE;
1560                         break;
1561                 case OVS_SAMPLE_ATTR_ACTIONS:
1562                         st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
1563                         if (!st_sample)
1564                                 return -EMSGSIZE;
1565                         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
1566                         if (err)
1567                                 return err;
1568                         nla_nest_end(skb, st_sample);
1569                         break;
1570                 }
1571         }
1572
1573         nla_nest_end(skb, start);
1574         return err;
1575 }
1576
1577 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
1578 {
1579         const struct nlattr *ovs_key = nla_data(a);
1580         int key_type = nla_type(ovs_key);
1581         struct nlattr *start;
1582         int err;
1583
1584         switch (key_type) {
1585         case OVS_KEY_ATTR_IPV4_TUNNEL:
1586                 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
1587                 if (!start)
1588                         return -EMSGSIZE;
1589
1590                 err = ipv4_tun_to_nlattr(skb, nla_data(ovs_key),
1591                                              nla_data(ovs_key));
1592                 if (err)
1593                         return err;
1594                 nla_nest_end(skb, start);
1595                 break;
1596         default:
1597                 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
1598                         return -EMSGSIZE;
1599                 break;
1600         }
1601
1602         return 0;
1603 }
1604
1605 int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
1606 {
1607         const struct nlattr *a;
1608         int rem, err;
1609
1610         nla_for_each_attr(a, attr, len, rem) {
1611                 int type = nla_type(a);
1612
1613                 switch (type) {
1614                 case OVS_ACTION_ATTR_SET:
1615                         err = set_action_to_attr(a, skb);
1616                         if (err)
1617                                 return err;
1618                         break;
1619
1620                 case OVS_ACTION_ATTR_SAMPLE:
1621                         err = sample_action_to_attr(a, skb);
1622                         if (err)
1623                                 return err;
1624                         break;
1625                 default:
1626                         if (nla_put(skb, type, nla_len(a), nla_data(a)))
1627                                 return -EMSGSIZE;
1628                         break;
1629                 }
1630         }
1631
1632         return 0;
1633 }