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->tp.src ==
 209                                                 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 210                                     match->key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 211                                         key_expected |= 1ULL << OVS_KEY_ATTR_ND;
 212                                         if (match->mask && (match->mask->key.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_DP_HASH] = sizeof(u32),
 256         [OVS_KEY_ATTR_RECIRC_ID] = sizeof(u32),
 257         [OVS_KEY_ATTR_TUNNEL] = -1,
 258 };
 259
 260 static bool is_all_zero(const u8 *fp, size_t size)
 261 {
 262         int i;
 263
 264         if (!fp)
 265                 return false;
 266
 267         for (i = 0; i < size; i++)
 268                 if (fp[i])
 269                         return false;
 270
 271         return true;
 272 }
 273
 274 static int __parse_flow_nlattrs(const struct nlattr *attr,
 275                                 const struct nlattr *a[],
 276                                 u64 *attrsp, bool nz)
 277 {
 278         const struct nlattr *nla;
 279         u64 attrs;
 280         int rem;
 281
 282         attrs = *attrsp;
 283         nla_for_each_nested(nla, attr, rem) {
 284                 u16 type = nla_type(nla);
 285                 int expected_len;
 286
 287                 if (type > OVS_KEY_ATTR_MAX) {
 288                         OVS_NLERR("Unknown key attribute (type=%d, max=%d).\n",
 289                                   type, OVS_KEY_ATTR_MAX);
 290                         return -EINVAL;
 291                 }
 292
 293                 if (attrs & (1ULL << type)) {
 294                         OVS_NLERR("Duplicate key attribute (type %d).\n", type);
 295                         return -EINVAL;
 296                 }
 297
 298                 expected_len = ovs_key_lens[type];
 299                 if (nla_len(nla) != expected_len && expected_len != -1) {
 300                         OVS_NLERR("Key attribute has unexpected length (type=%d"
 301                                   ", length=%d, expected=%d).\n", type,
 302                                   nla_len(nla), expected_len);
 303                         return -EINVAL;
 304                 }
 305
 306                 if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
 307                         attrs |= 1ULL << type;
 308                         a[type] = nla;
 309                 }
 310         }
 311         if (rem) {
 312                 OVS_NLERR("Message has %d unknown bytes.\n", rem);
 313                 return -EINVAL;
 314         }
 315
 316         *attrsp = attrs;
 317         return 0;
 318 }
 319
 320 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
 321                                    const struct nlattr *a[], u64 *attrsp)
 322 {
 323         return __parse_flow_nlattrs(attr, a, attrsp, true);
 324 }
 325
 326 static int parse_flow_nlattrs(const struct nlattr *attr,
 327                               const struct nlattr *a[], u64 *attrsp)
 328 {
 329         return __parse_flow_nlattrs(attr, a, attrsp, false);
 330 }
 331
 332 static int ipv4_tun_from_nlattr(const struct nlattr *attr,
 333                                 struct sw_flow_match *match, bool is_mask)
 334 {
 335         struct nlattr *a;
 336         int rem;
 337         bool ttl = false;
 338         __be16 tun_flags = 0;
 339
 340         nla_for_each_nested(a, attr, rem) {
 341                 int type = nla_type(a);
 342                 static const u32 ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
 343                         [OVS_TUNNEL_KEY_ATTR_ID] = sizeof(u64),
 344                         [OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = sizeof(u32),
 345                         [OVS_TUNNEL_KEY_ATTR_IPV4_DST] = sizeof(u32),
 346                         [OVS_TUNNEL_KEY_ATTR_TOS] = 1,
 347                         [OVS_TUNNEL_KEY_ATTR_TTL] = 1,
 348                         [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = 0,
 349                         [OVS_TUNNEL_KEY_ATTR_CSUM] = 0,
 350                         [OVS_TUNNEL_KEY_ATTR_OAM] = 0,
 351                 };
 352
 353                 if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
 354                         OVS_NLERR("Unknown IPv4 tunnel attribute (type=%d, max=%d).\n",
 355                         type, OVS_TUNNEL_KEY_ATTR_MAX);
 356                         return -EINVAL;
 357                 }
 358
 359                 if (ovs_tunnel_key_lens[type] != nla_len(a)) {
 360                         OVS_NLERR("IPv4 tunnel attribute type has unexpected "
 361                                   " length (type=%d, length=%d, expected=%d).\n",
 362                                   type, nla_len(a), ovs_tunnel_key_lens[type]);
 363                         return -EINVAL;
 364                 }
 365
 366                 switch (type) {
 367                 case OVS_TUNNEL_KEY_ATTR_ID:
 368                         SW_FLOW_KEY_PUT(match, tun_key.tun_id,
 369                                         nla_get_be64(a), is_mask);
 370                         tun_flags |= TUNNEL_KEY;
 371                         break;
 372                 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
 373                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_src,
 374                                         nla_get_be32(a), is_mask);
 375                         break;
 376                 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
 377                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst,
 378                                         nla_get_be32(a), is_mask);
 379                         break;
 380                 case OVS_TUNNEL_KEY_ATTR_TOS:
 381                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos,
 382                                         nla_get_u8(a), is_mask);
 383                         break;
 384                 case OVS_TUNNEL_KEY_ATTR_TTL:
 385                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_ttl,
 386                                         nla_get_u8(a), is_mask);
 387                         ttl = true;
 388                         break;
 389                 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
 390                         tun_flags |= TUNNEL_DONT_FRAGMENT;
 391                         break;
 392                 case OVS_TUNNEL_KEY_ATTR_CSUM:
 393                         tun_flags |= TUNNEL_CSUM;
 394                         break;
 395                 case OVS_TUNNEL_KEY_ATTR_OAM:
 396                         tun_flags |= TUNNEL_OAM;
 397                         break;
 398                 default:
 399                         return -EINVAL;
 400                 }
 401         }
 402
 403         SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
 404
 405         if (rem > 0) {
 406                 OVS_NLERR("IPv4 tunnel attribute has %d unknown bytes.\n", rem);
 407                 return -EINVAL;
 408         }
 409
 410         if (!is_mask) {
 411                 if (!match->key->tun_key.ipv4_dst) {
 412                         OVS_NLERR("IPv4 tunnel destination address is zero.\n");
 413                         return -EINVAL;
 414                 }
 415
 416                 if (!ttl) {
 417                         OVS_NLERR("IPv4 tunnel TTL not specified.\n");
 418                         return -EINVAL;
 419                 }
 420         }
 421
 422         return 0;
 423 }
 424
 425 static int ipv4_tun_to_nlattr(struct sk_buff *skb,
 426                               const struct ovs_key_ipv4_tunnel *tun_key,
 427                               const struct ovs_key_ipv4_tunnel *output)
 428 {
 429         struct nlattr *nla;
 430
 431         nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
 432         if (!nla)
 433                 return -EMSGSIZE;
 434
 435         if (output->tun_flags & TUNNEL_KEY &&
 436             nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id))
 437                 return -EMSGSIZE;
 438         if (output->ipv4_src &&
 439                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src))
 440                 return -EMSGSIZE;
 441         if (output->ipv4_dst &&
 442                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst))
 443                 return -EMSGSIZE;
 444         if (output->ipv4_tos &&
 445                 nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->ipv4_tos))
 446                 return -EMSGSIZE;
 447         if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl))
 448                 return -EMSGSIZE;
 449         if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
 450                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
 451                 return -EMSGSIZE;
 452         if ((output->tun_flags & TUNNEL_CSUM) &&
 453                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
 454                 return -EMSGSIZE;
 455         if ((output->tun_flags & TUNNEL_OAM) &&
 456                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_OAM))
 457                 return -EMSGSIZE;
 458
 459         nla_nest_end(skb, nla);
 460         return 0;
 461 }
 462
 463
 464 static int metadata_from_nlattrs(struct sw_flow_match *match,  u64 *attrs,
 465                                  const struct nlattr **a, bool is_mask)
 466 {
 467         if (*attrs & (1ULL << OVS_KEY_ATTR_DP_HASH)) {
 468                 u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]);
 469
 470                 SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask);
 471                 *attrs &= ~(1ULL << OVS_KEY_ATTR_DP_HASH);
 472         }
 473
 474         if (*attrs & (1ULL << OVS_KEY_ATTR_RECIRC_ID)) {
 475                 u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]);
 476
 477                 SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask);
 478                 *attrs &= ~(1ULL << OVS_KEY_ATTR_RECIRC_ID);
 479         }
 480
 481         if (*attrs & (1ULL << OVS_KEY_ATTR_PRIORITY)) {
 482                 SW_FLOW_KEY_PUT(match, phy.priority,
 483                           nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
 484                 *attrs &= ~(1ULL << OVS_KEY_ATTR_PRIORITY);
 485         }
 486
 487         if (*attrs & (1ULL << OVS_KEY_ATTR_IN_PORT)) {
 488                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
 489
 490                 if (is_mask)
 491                         in_port = 0xffffffff; /* Always exact match in_port. */
 492                 else if (in_port >= DP_MAX_PORTS)
 493                         return -EINVAL;
 494
 495                 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
 496                 *attrs &= ~(1ULL << OVS_KEY_ATTR_IN_PORT);
 497         } else if (!is_mask) {
 498                 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
 499         }
 500
 501         if (*attrs & (1ULL << OVS_KEY_ATTR_SKB_MARK)) {
 502                 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
 503
 504                 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
 505                 *attrs &= ~(1ULL << OVS_KEY_ATTR_SKB_MARK);
 506         }
 507         if (*attrs & (1ULL << OVS_KEY_ATTR_TUNNEL)) {
 508                 if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
 509                                          is_mask))
 510                         return -EINVAL;
 511                 *attrs &= ~(1ULL << OVS_KEY_ATTR_TUNNEL);
 512         }
 513         return 0;
 514 }
 515
 516 static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
 517                                 const struct nlattr **a, bool is_mask)
 518 {
 519         int err;
 520         u64 orig_attrs = attrs;
 521
 522         err = metadata_from_nlattrs(match, &attrs, a, is_mask);
 523         if (err)
 524                 return err;
 525
 526         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) {
 527                 const struct ovs_key_ethernet *eth_key;
 528
 529                 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
 530                 SW_FLOW_KEY_MEMCPY(match, eth.src,
 531                                 eth_key->eth_src, ETH_ALEN, is_mask);
 532                 SW_FLOW_KEY_MEMCPY(match, eth.dst,
 533                                 eth_key->eth_dst, ETH_ALEN, is_mask);
 534                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERNET);
 535         }
 536
 537         if (attrs & (1ULL << OVS_KEY_ATTR_VLAN)) {
 538                 __be16 tci;
 539
 540                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 541                 if (!(tci & htons(VLAN_TAG_PRESENT))) {
 542                         if (is_mask)
 543                                 OVS_NLERR("VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.\n");
 544                         else
 545                                 OVS_NLERR("VLAN TCI does not have VLAN_TAG_PRESENT bit set.\n");
 546
 547                         return -EINVAL;
 548                 }
 549
 550                 SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
 551                 attrs &= ~(1ULL << OVS_KEY_ATTR_VLAN);
 552         } else if (!is_mask)
 553                 SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
 554
 555         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) {
 556                 __be16 eth_type;
 557
 558                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 559                 if (is_mask) {
 560                         /* Always exact match EtherType. */
 561                         eth_type = htons(0xffff);
 562                 } else if (ntohs(eth_type) < ETH_P_802_3_MIN) {
 563                         OVS_NLERR("EtherType is less than minimum (type=%x, min=%x).\n",
 564                                         ntohs(eth_type), ETH_P_802_3_MIN);
 565                         return -EINVAL;
 566                 }
 567
 568                 SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
 569                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 570         } else if (!is_mask) {
 571                 SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
 572         }
 573
 574         if (attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 575                 const struct ovs_key_ipv4 *ipv4_key;
 576
 577                 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
 578                 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
 579                         OVS_NLERR("Unknown IPv4 fragment type (value=%d, max=%d).\n",
 580                                 ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
 581                         return -EINVAL;
 582                 }
 583                 SW_FLOW_KEY_PUT(match, ip.proto,
 584                                 ipv4_key->ipv4_proto, is_mask);
 585                 SW_FLOW_KEY_PUT(match, ip.tos,
 586                                 ipv4_key->ipv4_tos, is_mask);
 587                 SW_FLOW_KEY_PUT(match, ip.ttl,
 588                                 ipv4_key->ipv4_ttl, is_mask);
 589                 SW_FLOW_KEY_PUT(match, ip.frag,
 590                                 ipv4_key->ipv4_frag, is_mask);
 591                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 592                                 ipv4_key->ipv4_src, is_mask);
 593                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 594                                 ipv4_key->ipv4_dst, is_mask);
 595                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV4);
 596         }
 597
 598         if (attrs & (1ULL << OVS_KEY_ATTR_IPV6)) {
 599                 const struct ovs_key_ipv6 *ipv6_key;
 600
 601                 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
 602                 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
 603                         OVS_NLERR("Unknown IPv6 fragment type (value=%d, max=%d).\n",
 604                                 ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
 605                         return -EINVAL;
 606                 }
 607                 SW_FLOW_KEY_PUT(match, ipv6.label,
 608                                 ipv6_key->ipv6_label, is_mask);
 609                 SW_FLOW_KEY_PUT(match, ip.proto,
 610                                 ipv6_key->ipv6_proto, is_mask);
 611                 SW_FLOW_KEY_PUT(match, ip.tos,
 612                                 ipv6_key->ipv6_tclass, is_mask);
 613                 SW_FLOW_KEY_PUT(match, ip.ttl,
 614                                 ipv6_key->ipv6_hlimit, is_mask);
 615                 SW_FLOW_KEY_PUT(match, ip.frag,
 616                                 ipv6_key->ipv6_frag, is_mask);
 617                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
 618                                 ipv6_key->ipv6_src,
 619                                 sizeof(match->key->ipv6.addr.src),
 620                                 is_mask);
 621                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
 622                                 ipv6_key->ipv6_dst,
 623                                 sizeof(match->key->ipv6.addr.dst),
 624                                 is_mask);
 625
 626                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV6);
 627         }
 628
 629         if (attrs & (1ULL << OVS_KEY_ATTR_ARP)) {
 630                 const struct ovs_key_arp *arp_key;
 631
 632                 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
 633                 if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
 634                         OVS_NLERR("Unknown ARP opcode (opcode=%d).\n",
 635                                   arp_key->arp_op);
 636                         return -EINVAL;
 637                 }
 638
 639                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 640                                 arp_key->arp_sip, is_mask);
 641                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 642                         arp_key->arp_tip, is_mask);
 643                 SW_FLOW_KEY_PUT(match, ip.proto,
 644                                 ntohs(arp_key->arp_op), is_mask);
 645                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
 646                                 arp_key->arp_sha, ETH_ALEN, is_mask);
 647                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
 648                                 arp_key->arp_tha, ETH_ALEN, is_mask);
 649
 650                 attrs &= ~(1ULL << OVS_KEY_ATTR_ARP);
 651         }
 652
 653         if (attrs & (1ULL << OVS_KEY_ATTR_TCP)) {
 654                 const struct ovs_key_tcp *tcp_key;
 655
 656                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
 657                 SW_FLOW_KEY_PUT(match, tp.src, tcp_key->tcp_src, is_mask);
 658                 SW_FLOW_KEY_PUT(match, tp.dst, tcp_key->tcp_dst, is_mask);
 659                 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP);
 660         }
 661
 662         if (attrs & (1ULL << OVS_KEY_ATTR_TCP_FLAGS)) {
 663                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 664                         SW_FLOW_KEY_PUT(match, tp.flags,
 665                                         nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
 666                                         is_mask);
 667                 } else {
 668                         SW_FLOW_KEY_PUT(match, tp.flags,
 669                                         nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
 670                                         is_mask);
 671                 }
 672                 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP_FLAGS);
 673         }
 674
 675         if (attrs & (1ULL << OVS_KEY_ATTR_UDP)) {
 676                 const struct ovs_key_udp *udp_key;
 677
 678                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
 679                 SW_FLOW_KEY_PUT(match, tp.src, udp_key->udp_src, is_mask);
 680                 SW_FLOW_KEY_PUT(match, tp.dst, udp_key->udp_dst, is_mask);
 681                 attrs &= ~(1ULL << OVS_KEY_ATTR_UDP);
 682         }
 683
 684         if (attrs & (1ULL << OVS_KEY_ATTR_SCTP)) {
 685                 const struct ovs_key_sctp *sctp_key;
 686
 687                 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
 688                 SW_FLOW_KEY_PUT(match, tp.src, sctp_key->sctp_src, is_mask);
 689                 SW_FLOW_KEY_PUT(match, tp.dst, sctp_key->sctp_dst, is_mask);
 690                 attrs &= ~(1ULL << OVS_KEY_ATTR_SCTP);
 691         }
 692
 693         if (attrs & (1ULL << OVS_KEY_ATTR_ICMP)) {
 694                 const struct ovs_key_icmp *icmp_key;
 695
 696                 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
 697                 SW_FLOW_KEY_PUT(match, tp.src,
 698                                 htons(icmp_key->icmp_type), is_mask);
 699                 SW_FLOW_KEY_PUT(match, tp.dst,
 700                                 htons(icmp_key->icmp_code), is_mask);
 701                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMP);
 702         }
 703
 704         if (attrs & (1ULL << OVS_KEY_ATTR_ICMPV6)) {
 705                 const struct ovs_key_icmpv6 *icmpv6_key;
 706
 707                 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
 708                 SW_FLOW_KEY_PUT(match, tp.src,
 709                                 htons(icmpv6_key->icmpv6_type), is_mask);
 710                 SW_FLOW_KEY_PUT(match, tp.dst,
 711                                 htons(icmpv6_key->icmpv6_code), is_mask);
 712                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMPV6);
 713         }
 714
 715         if (attrs & (1ULL << OVS_KEY_ATTR_ND)) {
 716                 const struct ovs_key_nd *nd_key;
 717
 718                 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
 719                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
 720                         nd_key->nd_target,
 721                         sizeof(match->key->ipv6.nd.target),
 722                         is_mask);
 723                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
 724                         nd_key->nd_sll, ETH_ALEN, is_mask);
 725                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
 726                                 nd_key->nd_tll, ETH_ALEN, is_mask);
 727                 attrs &= ~(1ULL << OVS_KEY_ATTR_ND);
 728         }
 729
 730         if (attrs != 0)
 731                 return -EINVAL;
 732
 733         return 0;
 734 }
 735
 736 static void sw_flow_mask_set(struct sw_flow_mask *mask,
 737                              struct sw_flow_key_range *range, u8 val)
 738 {
 739         u8 *m = (u8 *)&mask->key + range->start;
 740
 741         mask->range = *range;
 742         memset(m, val, range_n_bytes(range));
 743 }
 744
 745 /**
 746  * ovs_nla_get_match - parses Netlink attributes into a flow key and
 747  * mask. In case the 'mask' is NULL, the flow is treated as exact match
 748  * flow. Otherwise, it is treated as a wildcarded flow, except the mask
 749  * does not include any don't care bit.
 750  * @match: receives the extracted flow match information.
 751  * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
 752  * sequence. The fields should of the packet that triggered the creation
 753  * of this flow.
 754  * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
 755  * attribute specifies the mask field of the wildcarded flow.
 756  */
 757 int ovs_nla_get_match(struct sw_flow_match *match,
 758                       const struct nlattr *key,
 759                       const struct nlattr *mask)
 760 {
 761         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
 762         const struct nlattr *encap;
 763         u64 key_attrs = 0;
 764         u64 mask_attrs = 0;
 765         bool encap_valid = false;
 766         int err;
 767
 768         err = parse_flow_nlattrs(key, a, &key_attrs);
 769         if (err)
 770                 return err;
 771
 772         if ((key_attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) &&
 773             (key_attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) &&
 774             (nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
 775                 __be16 tci;
 776
 777                 if (!((key_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) &&
 778                       (key_attrs & (1ULL << OVS_KEY_ATTR_ENCAP)))) {
 779                         OVS_NLERR("Invalid Vlan frame.\n");
 780                         return -EINVAL;
 781                 }
 782
 783                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 784                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 785                 encap = a[OVS_KEY_ATTR_ENCAP];
 786                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
 787                 encap_valid = true;
 788
 789                 if (tci & htons(VLAN_TAG_PRESENT)) {
 790                         err = parse_flow_nlattrs(encap, a, &key_attrs);
 791                         if (err)
 792                                 return err;
 793                 } else if (!tci) {
 794                         /* Corner case for truncated 802.1Q header. */
 795                         if (nla_len(encap)) {
 796                                 OVS_NLERR("Truncated 802.1Q header has non-zero encap attribute.\n");
 797                                 return -EINVAL;
 798                         }
 799                 } else {
 800                         OVS_NLERR("Encap attribute is set for a non-VLAN frame.\n");
 801                         return  -EINVAL;
 802                 }
 803         }
 804
 805         err = ovs_key_from_nlattrs(match, key_attrs, a, false);
 806         if (err)
 807                 return err;
 808
 809         if (mask) {
 810                 err = parse_flow_mask_nlattrs(mask, a, &mask_attrs);
 811                 if (err)
 812                         return err;
 813
 814                 if (mask_attrs & 1ULL << OVS_KEY_ATTR_ENCAP)  {
 815                         __be16 eth_type = 0;
 816                         __be16 tci = 0;
 817
 818                         if (!encap_valid) {
 819                                 OVS_NLERR("Encap mask attribute is set for non-VLAN frame.\n");
 820                                 return  -EINVAL;
 821                         }
 822
 823                         mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
 824                         if (a[OVS_KEY_ATTR_ETHERTYPE])
 825                                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 826
 827                         if (eth_type == htons(0xffff)) {
 828                                 mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 829                                 encap = a[OVS_KEY_ATTR_ENCAP];
 830                                 err = parse_flow_mask_nlattrs(encap, a, &mask_attrs);
 831                         } else {
 832                                 OVS_NLERR("VLAN frames must have an exact match on the TPID (mask=%x).\n",
 833                                                 ntohs(eth_type));
 834                                 return -EINVAL;
 835                         }
 836
 837                         if (a[OVS_KEY_ATTR_VLAN])
 838                                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 839
 840                         if (!(tci & htons(VLAN_TAG_PRESENT))) {
 841                                 OVS_NLERR("VLAN tag present bit must have an exact match (tci_mask=%x).\n", ntohs(tci));
 842                                 return -EINVAL;
 843                         }
 844                 }
 845
 846                 err = ovs_key_from_nlattrs(match, mask_attrs, a, true);
 847                 if (err)
 848                         return err;
 849         } else {
 850                 /* Populate exact match flow's key mask. */
 851                 if (match->mask)
 852                         sw_flow_mask_set(match->mask, &match->range, 0xff);
 853         }
 854
 855         if (!match_validate(match, key_attrs, mask_attrs))
 856                 return -EINVAL;
 857
 858         return 0;
 859 }
 860
 861 /**
 862  * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
 863  * @flow: Receives extracted in_port, priority, tun_key and skb_mark.
 864  * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
 865  * sequence.
 866  *
 867  * This parses a series of Netlink attributes that form a flow key, which must
 868  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
 869  * get the metadata, that is, the parts of the flow key that cannot be
 870  * extracted from the packet itself.
 871  */
 872
 873 int ovs_nla_get_flow_metadata(struct sw_flow *flow,
 874                               const struct nlattr *attr)
 875 {
 876         struct ovs_key_ipv4_tunnel *tun_key = &flow->key.tun_key;
 877         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
 878         u64 attrs = 0;
 879         int err;
 880         struct sw_flow_match match;
 881
 882         flow->key.phy.in_port = DP_MAX_PORTS;
 883         flow->key.phy.priority = 0;
 884         flow->key.phy.skb_mark = 0;
 885         flow->key.ovs_flow_hash = 0;
 886         flow->key.recirc_id = 0;
 887         memset(tun_key, 0, sizeof(flow->key.tun_key));
 888
 889         err = parse_flow_nlattrs(attr, a, &attrs);
 890         if (err)
 891                 return -EINVAL;
 892
 893         memset(&match, 0, sizeof(match));
 894         match.key = &flow->key;
 895
 896         err = metadata_from_nlattrs(&match, &attrs, a, false);
 897         if (err)
 898                 return err;
 899
 900         return 0;
 901 }
 902
 903 int ovs_nla_put_flow(const struct sw_flow_key *swkey,
 904                      const struct sw_flow_key *output, struct sk_buff *skb)
 905 {
 906         struct ovs_key_ethernet *eth_key;
 907         struct nlattr *nla, *encap;
 908         bool is_mask = (swkey != output);
 909
 910         if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash))
 911                 goto nla_put_failure;
 912
 913         if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id))
 914                 goto nla_put_failure;
 915
 916         if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
 917                 goto nla_put_failure;
 918
 919         if ((swkey->tun_key.ipv4_dst || is_mask) &&
 920             ipv4_tun_to_nlattr(skb, &swkey->tun_key, &output->tun_key))
 921                 goto nla_put_failure;
 922
 923         if (swkey->phy.in_port == DP_MAX_PORTS) {
 924                 if (is_mask && (output->phy.in_port == 0xffff))
 925                         if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
 926                                 goto nla_put_failure;
 927         } else {
 928                 u16 upper_u16;
 929                 upper_u16 = !is_mask ? 0 : 0xffff;
 930
 931                 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
 932                                 (upper_u16 << 16) | output->phy.in_port))
 933                         goto nla_put_failure;
 934         }
 935
 936         if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
 937                 goto nla_put_failure;
 938
 939         nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
 940         if (!nla)
 941                 goto nla_put_failure;
 942
 943         eth_key = nla_data(nla);
 944         ether_addr_copy(eth_key->eth_src, output->eth.src);
 945         ether_addr_copy(eth_key->eth_dst, output->eth.dst);
 946
 947         if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
 948                 __be16 eth_type;
 949                 eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff);
 950                 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
 951                     nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
 952                         goto nla_put_failure;
 953                 encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
 954                 if (!swkey->eth.tci)
 955                         goto unencap;
 956         } else
 957                 encap = NULL;
 958
 959         if (swkey->eth.type == htons(ETH_P_802_2)) {
 960                 /*
 961                  * Ethertype 802.2 is represented in the netlink with omitted
 962                  * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
 963                  * 0xffff in the mask attribute.  Ethertype can also
 964                  * be wildcarded.
 965                  */
 966                 if (is_mask && output->eth.type)
 967                         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
 968                                                 output->eth.type))
 969                                 goto nla_put_failure;
 970                 goto unencap;
 971         }
 972
 973         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
 974                 goto nla_put_failure;
 975
 976         if (swkey->eth.type == htons(ETH_P_IP)) {
 977                 struct ovs_key_ipv4 *ipv4_key;
 978
 979                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
 980                 if (!nla)
 981                         goto nla_put_failure;
 982                 ipv4_key = nla_data(nla);
 983                 ipv4_key->ipv4_src = output->ipv4.addr.src;
 984                 ipv4_key->ipv4_dst = output->ipv4.addr.dst;
 985                 ipv4_key->ipv4_proto = output->ip.proto;
 986                 ipv4_key->ipv4_tos = output->ip.tos;
 987                 ipv4_key->ipv4_ttl = output->ip.ttl;
 988                 ipv4_key->ipv4_frag = output->ip.frag;
 989         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
 990                 struct ovs_key_ipv6 *ipv6_key;
 991
 992                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
 993                 if (!nla)
 994                         goto nla_put_failure;
 995                 ipv6_key = nla_data(nla);
 996                 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
 997                                 sizeof(ipv6_key->ipv6_src));
 998                 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
 999                                 sizeof(ipv6_key->ipv6_dst));
1000                 ipv6_key->ipv6_label = output->ipv6.label;
1001                 ipv6_key->ipv6_proto = output->ip.proto;
1002                 ipv6_key->ipv6_tclass = output->ip.tos;
1003                 ipv6_key->ipv6_hlimit = output->ip.ttl;
1004                 ipv6_key->ipv6_frag = output->ip.frag;
1005         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
1006                    swkey->eth.type == htons(ETH_P_RARP)) {
1007                 struct ovs_key_arp *arp_key;
1008
1009                 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
1010                 if (!nla)
1011                         goto nla_put_failure;
1012                 arp_key = nla_data(nla);
1013                 memset(arp_key, 0, sizeof(struct ovs_key_arp));
1014                 arp_key->arp_sip = output->ipv4.addr.src;
1015                 arp_key->arp_tip = output->ipv4.addr.dst;
1016                 arp_key->arp_op = htons(output->ip.proto);
1017                 ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha);
1018                 ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha);
1019         }
1020
1021         if ((swkey->eth.type == htons(ETH_P_IP) ||
1022              swkey->eth.type == htons(ETH_P_IPV6)) &&
1023              swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1024
1025                 if (swkey->ip.proto == IPPROTO_TCP) {
1026                         struct ovs_key_tcp *tcp_key;
1027
1028                         nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
1029                         if (!nla)
1030                                 goto nla_put_failure;
1031                         tcp_key = nla_data(nla);
1032                         tcp_key->tcp_src = output->tp.src;
1033                         tcp_key->tcp_dst = output->tp.dst;
1034                         if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
1035                                          output->tp.flags))
1036                                 goto nla_put_failure;
1037                 } else if (swkey->ip.proto == IPPROTO_UDP) {
1038                         struct ovs_key_udp *udp_key;
1039
1040                         nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
1041                         if (!nla)
1042                                 goto nla_put_failure;
1043                         udp_key = nla_data(nla);
1044                         udp_key->udp_src = output->tp.src;
1045                         udp_key->udp_dst = output->tp.dst;
1046                 } else if (swkey->ip.proto == IPPROTO_SCTP) {
1047                         struct ovs_key_sctp *sctp_key;
1048
1049                         nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
1050                         if (!nla)
1051                                 goto nla_put_failure;
1052                         sctp_key = nla_data(nla);
1053                         sctp_key->sctp_src = output->tp.src;
1054                         sctp_key->sctp_dst = output->tp.dst;
1055                 } else if (swkey->eth.type == htons(ETH_P_IP) &&
1056                            swkey->ip.proto == IPPROTO_ICMP) {
1057                         struct ovs_key_icmp *icmp_key;
1058
1059                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
1060                         if (!nla)
1061                                 goto nla_put_failure;
1062                         icmp_key = nla_data(nla);
1063                         icmp_key->icmp_type = ntohs(output->tp.src);
1064                         icmp_key->icmp_code = ntohs(output->tp.dst);
1065                 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
1066                            swkey->ip.proto == IPPROTO_ICMPV6) {
1067                         struct ovs_key_icmpv6 *icmpv6_key;
1068
1069                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
1070                                                 sizeof(*icmpv6_key));
1071                         if (!nla)
1072                                 goto nla_put_failure;
1073                         icmpv6_key = nla_data(nla);
1074                         icmpv6_key->icmpv6_type = ntohs(output->tp.src);
1075                         icmpv6_key->icmpv6_code = ntohs(output->tp.dst);
1076
1077                         if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
1078                             icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
1079                                 struct ovs_key_nd *nd_key;
1080
1081                                 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
1082                                 if (!nla)
1083                                         goto nla_put_failure;
1084                                 nd_key = nla_data(nla);
1085                                 memcpy(nd_key->nd_target, &output->ipv6.nd.target,
1086                                                         sizeof(nd_key->nd_target));
1087                                 ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll);
1088                                 ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll);
1089                         }
1090                 }
1091         }
1092
1093 unencap:
1094         if (encap)
1095                 nla_nest_end(skb, encap);
1096
1097         return 0;
1098
1099 nla_put_failure:
1100         return -EMSGSIZE;
1101 }
1102
1103 #define MAX_ACTIONS_BUFSIZE     (32 * 1024)
1104
1105 struct sw_flow_actions *ovs_nla_alloc_flow_actions(int size)
1106 {
1107         struct sw_flow_actions *sfa;
1108
1109         if (size > MAX_ACTIONS_BUFSIZE)
1110                 return ERR_PTR(-EINVAL);
1111
1112         sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
1113         if (!sfa)
1114                 return ERR_PTR(-ENOMEM);
1115
1116         sfa->actions_len = 0;
1117         return sfa;
1118 }
1119
1120 /* RCU callback used by ovs_nla_free_flow_actions. */
1121 static void rcu_free_acts_callback(struct rcu_head *rcu)
1122 {
1123         struct sw_flow_actions *sf_acts = container_of(rcu,
1124                         struct sw_flow_actions, rcu);
1125         kfree(sf_acts);
1126 }
1127
1128 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
1129  * The caller must hold rcu_read_lock for this to be sensible. */
1130 void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
1131 {
1132         call_rcu(&sf_acts->rcu, rcu_free_acts_callback);
1133 }
1134
1135 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
1136                                        int attr_len)
1137 {
1138
1139         struct sw_flow_actions *acts;
1140         int new_acts_size;
1141         int req_size = NLA_ALIGN(attr_len);
1142         int next_offset = offsetof(struct sw_flow_actions, actions) +
1143                                         (*sfa)->actions_len;
1144
1145         if (req_size <= (ksize(*sfa) - next_offset))
1146                 goto out;
1147
1148         new_acts_size = ksize(*sfa) * 2;
1149
1150         if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
1151                 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
1152                         return ERR_PTR(-EMSGSIZE);
1153                 new_acts_size = MAX_ACTIONS_BUFSIZE;
1154         }
1155
1156         acts = ovs_nla_alloc_flow_actions(new_acts_size);
1157         if (IS_ERR(acts))
1158                 return (void *)acts;
1159
1160         memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
1161         acts->actions_len = (*sfa)->actions_len;
1162         kfree(*sfa);
1163         *sfa = acts;
1164
1165 out:
1166         (*sfa)->actions_len += req_size;
1167         return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
1168 }
1169
1170 static struct nlattr *__add_action(struct sw_flow_actions **sfa, int attrtype,
1171                                    void *data, int len)
1172 {
1173         struct nlattr *a;
1174
1175         a = reserve_sfa_size(sfa, nla_attr_size(len));
1176         if (IS_ERR(a))
1177                 return a;
1178
1179         a->nla_type = attrtype;
1180         a->nla_len = nla_attr_size(len);
1181
1182         if (data)
1183                 memcpy(nla_data(a), data, len);
1184         memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
1185
1186         return a;
1187 }
1188
1189 static int add_action(struct sw_flow_actions **sfa, int attrtype,
1190                       void *data, int len)
1191 {
1192         struct nlattr *a;
1193
1194         a = __add_action(sfa, attrtype, data, len);
1195         if (IS_ERR(a))
1196                 return PTR_ERR(a);
1197
1198         return 0;
1199 }
1200
1201 static inline int add_nested_action_start(struct sw_flow_actions **sfa,
1202                                           int attrtype)
1203 {
1204         int used = (*sfa)->actions_len;
1205         int err;
1206
1207         err = add_action(sfa, attrtype, NULL, 0);
1208         if (err)
1209                 return err;
1210
1211         return used;
1212 }
1213
1214 static inline void add_nested_action_end(struct sw_flow_actions *sfa,
1215                                          int st_offset)
1216 {
1217         struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
1218                                                                st_offset);
1219
1220         a->nla_len = sfa->actions_len - st_offset;
1221 }
1222
1223 static int validate_and_copy_sample(const struct nlattr *attr,
1224                                     const struct sw_flow_key *key, int depth,
1225                                     struct sw_flow_actions **sfa)
1226 {
1227         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
1228         const struct nlattr *probability, *actions;
1229         const struct nlattr *a;
1230         int rem, start, err, st_acts;
1231
1232         memset(attrs, 0, sizeof(attrs));
1233         nla_for_each_nested(a, attr, rem) {
1234                 int type = nla_type(a);
1235                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
1236                         return -EINVAL;
1237                 attrs[type] = a;
1238         }
1239         if (rem)
1240                 return -EINVAL;
1241
1242         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
1243         if (!probability || nla_len(probability) != sizeof(u32))
1244                 return -EINVAL;
1245
1246         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
1247         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
1248                 return -EINVAL;
1249
1250         /* validation done, copy sample action. */
1251         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE);
1252         if (start < 0)
1253                 return start;
1254         err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY,
1255                          nla_data(probability), sizeof(u32));
1256         if (err)
1257                 return err;
1258         st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
1259         if (st_acts < 0)
1260                 return st_acts;
1261
1262         err = ovs_nla_copy_actions(actions, key, depth + 1, sfa);
1263         if (err)
1264                 return err;
1265
1266         add_nested_action_end(*sfa, st_acts);
1267         add_nested_action_end(*sfa, start);
1268
1269         return 0;
1270 }
1271
1272 static int validate_tp_port(const struct sw_flow_key *flow_key)
1273 {
1274         if ((flow_key->eth.type == htons(ETH_P_IP) ||
1275              flow_key->eth.type == htons(ETH_P_IPV6)) &&
1276             (flow_key->tp.src || flow_key->tp.dst))
1277                 return 0;
1278
1279         return -EINVAL;
1280 }
1281
1282 void ovs_match_init(struct sw_flow_match *match,
1283                     struct sw_flow_key *key,
1284                     struct sw_flow_mask *mask)
1285 {
1286         memset(match, 0, sizeof(*match));
1287         match->key = key;
1288         match->mask = mask;
1289
1290         memset(key, 0, sizeof(*key));
1291
1292         if (mask) {
1293                 memset(&mask->key, 0, sizeof(mask->key));
1294                 mask->range.start = mask->range.end = 0;
1295         }
1296 }
1297
1298 static int validate_and_copy_set_tun(const struct nlattr *attr,
1299                                      struct sw_flow_actions **sfa)
1300 {
1301         struct sw_flow_match match;
1302         struct sw_flow_key key;
1303         struct ovs_tunnel_info *tun_info;
1304         struct nlattr *a;
1305         int err, start;
1306
1307         ovs_match_init(&match, &key, NULL);
1308         err = ipv4_tun_from_nlattr(nla_data(attr), &match, false);
1309         if (err)
1310                 return err;
1311
1312         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
1313         if (start < 0)
1314                 return start;
1315
1316         a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL,
1317                         sizeof(*tun_info));
1318         if (IS_ERR(a))
1319                 return PTR_ERR(a);
1320
1321         tun_info = nla_data(a);
1322         tun_info->tunnel = key.tun_key;
1323
1324         add_nested_action_end(*sfa, start);
1325
1326         return err;
1327 }
1328
1329 static int validate_set(const struct nlattr *a,
1330                         const struct sw_flow_key *flow_key,
1331                         struct sw_flow_actions **sfa,
1332                         bool *set_tun)
1333 {
1334         const struct nlattr *ovs_key = nla_data(a);
1335         int key_type = nla_type(ovs_key);
1336
1337         /* There can be only one key in a action */
1338         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
1339                 return -EINVAL;
1340
1341         if (key_type > OVS_KEY_ATTR_MAX ||
1342             (ovs_key_lens[key_type] != nla_len(ovs_key) &&
1343              ovs_key_lens[key_type] != -1))
1344                 return -EINVAL;
1345
1346         switch (key_type) {
1347         const struct ovs_key_ipv4 *ipv4_key;
1348         const struct ovs_key_ipv6 *ipv6_key;
1349         int err;
1350
1351         case OVS_KEY_ATTR_PRIORITY:
1352         case OVS_KEY_ATTR_SKB_MARK:
1353         case OVS_KEY_ATTR_ETHERNET:
1354                 break;
1355
1356         case OVS_KEY_ATTR_TUNNEL:
1357                 *set_tun = true;
1358                 err = validate_and_copy_set_tun(a, sfa);
1359                 if (err)
1360                         return err;
1361                 break;
1362
1363         case OVS_KEY_ATTR_IPV4:
1364                 if (flow_key->eth.type != htons(ETH_P_IP))
1365                         return -EINVAL;
1366
1367                 if (!flow_key->ip.proto)
1368                         return -EINVAL;
1369
1370                 ipv4_key = nla_data(ovs_key);
1371                 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
1372                         return -EINVAL;
1373
1374                 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
1375                         return -EINVAL;
1376
1377                 break;
1378
1379         case OVS_KEY_ATTR_IPV6:
1380                 if (flow_key->eth.type != htons(ETH_P_IPV6))
1381                         return -EINVAL;
1382
1383                 if (!flow_key->ip.proto)
1384                         return -EINVAL;
1385
1386                 ipv6_key = nla_data(ovs_key);
1387                 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
1388                         return -EINVAL;
1389
1390                 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
1391                         return -EINVAL;
1392
1393                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
1394                         return -EINVAL;
1395
1396                 break;
1397
1398         case OVS_KEY_ATTR_TCP:
1399                 if (flow_key->ip.proto != IPPROTO_TCP)
1400                         return -EINVAL;
1401
1402                 return validate_tp_port(flow_key);
1403
1404         case OVS_KEY_ATTR_UDP:
1405                 if (flow_key->ip.proto != IPPROTO_UDP)
1406                         return -EINVAL;
1407
1408                 return validate_tp_port(flow_key);
1409
1410         case OVS_KEY_ATTR_SCTP:
1411                 if (flow_key->ip.proto != IPPROTO_SCTP)
1412                         return -EINVAL;
1413
1414                 return validate_tp_port(flow_key);
1415
1416         default:
1417                 return -EINVAL;
1418         }
1419
1420         return 0;
1421 }
1422
1423 static int validate_userspace(const struct nlattr *attr)
1424 {
1425         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
1426                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
1427                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
1428         };
1429         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
1430         int error;
1431
1432         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
1433                                  attr, userspace_policy);
1434         if (error)
1435                 return error;
1436
1437         if (!a[OVS_USERSPACE_ATTR_PID] ||
1438             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
1439                 return -EINVAL;
1440
1441         return 0;
1442 }
1443
1444 static int copy_action(const struct nlattr *from,
1445                        struct sw_flow_actions **sfa)
1446 {
1447         int totlen = NLA_ALIGN(from->nla_len);
1448         struct nlattr *to;
1449
1450         to = reserve_sfa_size(sfa, from->nla_len);
1451         if (IS_ERR(to))
1452                 return PTR_ERR(to);
1453
1454         memcpy(to, from, totlen);
1455         return 0;
1456 }
1457
1458 int ovs_nla_copy_actions(const struct nlattr *attr,
1459                          const struct sw_flow_key *key,
1460                          int depth,
1461                          struct sw_flow_actions **sfa)
1462 {
1463         const struct nlattr *a;
1464         int rem, err;
1465
1466         if (depth >= SAMPLE_ACTION_DEPTH)
1467                 return -EOVERFLOW;
1468
1469         nla_for_each_nested(a, attr, rem) {
1470                 /* Expected argument lengths, (u32)-1 for variable length. */
1471                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
1472                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
1473                         [OVS_ACTION_ATTR_RECIRC] = sizeof(u32),
1474                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
1475                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
1476                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
1477                         [OVS_ACTION_ATTR_SET] = (u32)-1,
1478                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
1479                         [OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash)
1480                 };
1481                 const struct ovs_action_push_vlan *vlan;
1482                 int type = nla_type(a);
1483                 bool skip_copy;
1484
1485                 if (type > OVS_ACTION_ATTR_MAX ||
1486                     (action_lens[type] != nla_len(a) &&
1487                      action_lens[type] != (u32)-1))
1488                         return -EINVAL;
1489
1490                 skip_copy = false;
1491                 switch (type) {
1492                 case OVS_ACTION_ATTR_UNSPEC:
1493                         return -EINVAL;
1494
1495                 case OVS_ACTION_ATTR_USERSPACE:
1496                         err = validate_userspace(a);
1497                         if (err)
1498                                 return err;
1499                         break;
1500
1501                 case OVS_ACTION_ATTR_OUTPUT:
1502                         if (nla_get_u32(a) >= DP_MAX_PORTS)
1503                                 return -EINVAL;
1504                         break;
1505
1506                 case OVS_ACTION_ATTR_HASH: {
1507                         const struct ovs_action_hash *act_hash = nla_data(a);
1508
1509                         switch (act_hash->hash_alg) {
1510                         case OVS_HASH_ALG_L4:
1511                                 break;
1512                         default:
1513                                 return  -EINVAL;
1514                         }
1515
1516                         break;
1517                 }
1518
1519                 case OVS_ACTION_ATTR_POP_VLAN:
1520                         break;
1521
1522                 case OVS_ACTION_ATTR_PUSH_VLAN:
1523                         vlan = nla_data(a);
1524                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
1525                                 return -EINVAL;
1526                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
1527                                 return -EINVAL;
1528                         break;
1529
1530                 case OVS_ACTION_ATTR_RECIRC:
1531                         break;
1532
1533                 case OVS_ACTION_ATTR_SET:
1534                         err = validate_set(a, key, sfa, &skip_copy);
1535                         if (err)
1536                                 return err;
1537                         break;
1538
1539                 case OVS_ACTION_ATTR_SAMPLE:
1540                         err = validate_and_copy_sample(a, key, depth, sfa);
1541                         if (err)
1542                                 return err;
1543                         skip_copy = true;
1544                         break;
1545
1546                 default:
1547                         return -EINVAL;
1548                 }
1549                 if (!skip_copy) {
1550                         err = copy_action(a, sfa);
1551                         if (err)
1552                                 return err;
1553                 }
1554         }
1555
1556         if (rem > 0)
1557                 return -EINVAL;
1558
1559         return 0;
1560 }
1561
1562 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
1563 {
1564         const struct nlattr *a;
1565         struct nlattr *start;
1566         int err = 0, rem;
1567
1568         start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
1569         if (!start)
1570                 return -EMSGSIZE;
1571
1572         nla_for_each_nested(a, attr, rem) {
1573                 int type = nla_type(a);
1574                 struct nlattr *st_sample;
1575
1576                 switch (type) {
1577                 case OVS_SAMPLE_ATTR_PROBABILITY:
1578                         if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY,
1579                                     sizeof(u32), nla_data(a)))
1580                                 return -EMSGSIZE;
1581                         break;
1582                 case OVS_SAMPLE_ATTR_ACTIONS:
1583                         st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
1584                         if (!st_sample)
1585                                 return -EMSGSIZE;
1586                         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
1587                         if (err)
1588                                 return err;
1589                         nla_nest_end(skb, st_sample);
1590                         break;
1591                 }
1592         }
1593
1594         nla_nest_end(skb, start);
1595         return err;
1596 }
1597
1598 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
1599 {
1600         const struct nlattr *ovs_key = nla_data(a);
1601         int key_type = nla_type(ovs_key);
1602         struct nlattr *start;
1603         int err;
1604
1605         switch (key_type) {
1606         case OVS_KEY_ATTR_TUNNEL_INFO: {
1607                 struct ovs_tunnel_info *tun_info = nla_data(ovs_key);
1608
1609                 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
1610                 if (!start)
1611                         return -EMSGSIZE;
1612
1613                 err = ipv4_tun_to_nlattr(skb, &tun_info->tunnel,
1614                                          &tun_info->tunnel);
1615                 if (err)
1616                         return err;
1617                 nla_nest_end(skb, start);
1618                 break;
1619         }
1620         default:
1621                 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
1622                         return -EMSGSIZE;
1623                 break;
1624         }
1625
1626         return 0;
1627 }
1628
1629 int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
1630 {
1631         const struct nlattr *a;
1632         int rem, err;
1633
1634         nla_for_each_attr(a, attr, len, rem) {
1635                 int type = nla_type(a);
1636
1637                 switch (type) {
1638                 case OVS_ACTION_ATTR_SET:
1639                         err = set_action_to_attr(a, skb);
1640                         if (err)
1641                                 return err;
1642                         break;
1643
1644                 case OVS_ACTION_ATTR_SAMPLE:
1645                         err = sample_action_to_attr(a, skb);
1646                         if (err)
1647                                 return err;
1648                         break;
1649                 default:
1650                         if (nla_put(skb, type, nla_len(a), nla_data(a)))
1651                                 return -EMSGSIZE;
1652                         break;
1653                 }
1654         }
1655
1656         return 0;
1657 }