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/ipv6.h>
  47 #include <net/ndisc.h>
  48
  49 #include "flow_netlink.h"
  50
  51 static void update_range__(struct sw_flow_match *match,
  52                            size_t offset, size_t size, bool is_mask)
  53 {
  54         struct sw_flow_key_range *range = NULL;
  55         size_t start = rounddown(offset, sizeof(long));
  56         size_t end = roundup(offset + size, sizeof(long));
  57
  58         if (!is_mask)
  59                 range = &match->range;
  60         else if (match->mask)
  61                 range = &match->mask->range;
  62
  63         if (!range)
  64                 return;
  65
  66         if (range->start == range->end) {
  67                 range->start = start;
  68                 range->end = end;
  69                 return;
  70         }
  71
  72         if (range->start > start)
  73                 range->start = start;
  74
  75         if (range->end < end)
  76                 range->end = end;
  77 }
  78
  79 #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
  80         do { \
  81                 update_range__(match, offsetof(struct sw_flow_key, field),  \
  82                                      sizeof((match)->key->field), is_mask); \
  83                 if (is_mask) {                                              \
  84                         if ((match)->mask)                                  \
  85                                 (match)->mask->key.field = value;           \
  86                 } else {                                                    \
  87                         (match)->key->field = value;                        \
  88                 }                                                           \
  89         } while (0)
  90
  91 #define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask) \
  92         do { \
  93                 update_range__(match, offsetof(struct sw_flow_key, field),  \
  94                                 len, is_mask);                              \
  95                 if (is_mask) {                                              \
  96                         if ((match)->mask)                                  \
  97                                 memcpy(&(match)->mask->key.field, value_p, len);\
  98                 } else {                                                    \
  99                         memcpy(&(match)->key->field, value_p, len);         \
 100                 }                                                           \
 101         } while (0)
 102
 103 static u16 range_n_bytes(const struct sw_flow_key_range *range)
 104 {
 105         return range->end - range->start;
 106 }
 107
 108 static bool match_validate(const struct sw_flow_match *match,
 109                            u64 key_attrs, u64 mask_attrs)
 110 {
 111         u64 key_expected = 1ULL << OVS_KEY_ATTR_ETHERNET;
 112         u64 mask_allowed = key_attrs;  /* At most allow all key attributes */
 113
 114         /* The following mask attributes allowed only if they
 115          * pass the validation tests. */
 116         mask_allowed &= ~((1ULL << OVS_KEY_ATTR_IPV4)
 117                         | (1ULL << OVS_KEY_ATTR_IPV6)
 118                         | (1ULL << OVS_KEY_ATTR_TCP)
 119                         | (1ULL << OVS_KEY_ATTR_TCP_FLAGS)
 120                         | (1ULL << OVS_KEY_ATTR_UDP)
 121                         | (1ULL << OVS_KEY_ATTR_SCTP)
 122                         | (1ULL << OVS_KEY_ATTR_ICMP)
 123                         | (1ULL << OVS_KEY_ATTR_ICMPV6)
 124                         | (1ULL << OVS_KEY_ATTR_ARP)
 125                         | (1ULL << OVS_KEY_ATTR_ND));
 126
 127         /* Always allowed mask fields. */
 128         mask_allowed |= ((1ULL << OVS_KEY_ATTR_TUNNEL)
 129                        | (1ULL << OVS_KEY_ATTR_IN_PORT)
 130                        | (1ULL << OVS_KEY_ATTR_ETHERTYPE));
 131
 132         /* Check key attributes. */
 133         if (match->key->eth.type == htons(ETH_P_ARP)
 134                         || match->key->eth.type == htons(ETH_P_RARP)) {
 135                 key_expected |= 1ULL << OVS_KEY_ATTR_ARP;
 136                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 137                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ARP;
 138         }
 139
 140         if (match->key->eth.type == htons(ETH_P_IP)) {
 141                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV4;
 142                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 143                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV4;
 144
 145                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 146                         if (match->key->ip.proto == IPPROTO_UDP) {
 147                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 148                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 149                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 150                         }
 151
 152                         if (match->key->ip.proto == IPPROTO_SCTP) {
 153                                 key_expected |= 1ULL << OVS_KEY_ATTR_SCTP;
 154                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 155                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_SCTP;
 156                         }
 157
 158                         if (match->key->ip.proto == IPPROTO_TCP) {
 159                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 160                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 161                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 162                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 163                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 164                                 }
 165                         }
 166
 167                         if (match->key->ip.proto == IPPROTO_ICMP) {
 168                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMP;
 169                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 170                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMP;
 171                         }
 172                 }
 173         }
 174
 175         if (match->key->eth.type == htons(ETH_P_IPV6)) {
 176                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV6;
 177                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 178                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV6;
 179
 180                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 181                         if (match->key->ip.proto == IPPROTO_UDP) {
 182                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 183                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 184                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 185                         }
 186
 187                         if (match->key->ip.proto == IPPROTO_SCTP) {
 188                                 key_expected |= 1ULL << OVS_KEY_ATTR_SCTP;
 189                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 190                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_SCTP;
 191                         }
 192
 193                         if (match->key->ip.proto == IPPROTO_TCP) {
 194                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 195                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 196                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 197                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 198                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 199                                 }
 200                         }
 201
 202                         if (match->key->ip.proto == IPPROTO_ICMPV6) {
 203                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 204                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 205                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 206
 207                                 if (match->key->ipv6.tp.src ==
 208                                                 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 209                                     match->key->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 210                                         key_expected |= 1ULL << OVS_KEY_ATTR_ND;
 211                                         if (match->mask && (match->mask->key.ipv6.tp.src == htons(0xffff)))
 212                                                 mask_allowed |= 1ULL << OVS_KEY_ATTR_ND;
 213                                 }
 214                         }
 215                 }
 216         }
 217
 218         if ((key_attrs & key_expected) != key_expected) {
 219                 /* Key attributes check failed. */
 220                 OVS_NLERR("Missing expected key attributes (key_attrs=%llx, expected=%llx).\n",
 221                                 (unsigned long long)key_attrs, (unsigned long long)key_expected);
 222                 return false;
 223         }
 224
 225         if ((mask_attrs & mask_allowed) != mask_attrs) {
 226                 /* Mask attributes check failed. */
 227                 OVS_NLERR("Contain more than allowed mask fields (mask_attrs=%llx, mask_allowed=%llx).\n",
 228                                 (unsigned long long)mask_attrs, (unsigned long long)mask_allowed);
 229                 return false;
 230         }
 231
 232         return true;
 233 }
 234
 235 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
 236 static const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
 237         [OVS_KEY_ATTR_ENCAP] = -1,
 238         [OVS_KEY_ATTR_PRIORITY] = sizeof(u32),
 239         [OVS_KEY_ATTR_IN_PORT] = sizeof(u32),
 240         [OVS_KEY_ATTR_SKB_MARK] = sizeof(u32),
 241         [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet),
 242         [OVS_KEY_ATTR_VLAN] = sizeof(__be16),
 243         [OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16),
 244         [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
 245         [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
 246         [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
 247         [OVS_KEY_ATTR_TCP_FLAGS] = sizeof(__be16),
 248         [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
 249         [OVS_KEY_ATTR_SCTP] = sizeof(struct ovs_key_sctp),
 250         [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
 251         [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
 252         [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
 253         [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
 254         [OVS_KEY_ATTR_TUNNEL] = -1,
 255 };
 256
 257 static bool is_all_zero(const u8 *fp, size_t size)
 258 {
 259         int i;
 260
 261         if (!fp)
 262                 return false;
 263
 264         for (i = 0; i < size; i++)
 265                 if (fp[i])
 266                         return false;
 267
 268         return true;
 269 }
 270
 271 static bool is_all_set(const u8 *fp, size_t size)
 272 {
 273         int i;
 274
 275         if (!fp)
 276                 return false;
 277
 278         for (i = 0; i < size; i++)
 279                 if (fp[i] != 0xff)
 280                         return false;
 281
 282         return true;
 283 }
 284
 285 static int __parse_flow_nlattrs(const struct nlattr *attr,
 286                                 const struct nlattr *a[],
 287                                 u64 *attrsp, bool nz)
 288 {
 289         const struct nlattr *nla;
 290         u64 attrs;
 291         int rem;
 292
 293         attrs = *attrsp;
 294         nla_for_each_nested(nla, attr, rem) {
 295                 u16 type = nla_type(nla);
 296                 int expected_len;
 297
 298                 if (type > OVS_KEY_ATTR_MAX) {
 299                         OVS_NLERR("Unknown key attribute (type=%d, max=%d).\n",
 300                                   type, OVS_KEY_ATTR_MAX);
 301                         return -EINVAL;
 302                 }
 303
 304                 if (attrs & (1ULL << type)) {
 305                         OVS_NLERR("Duplicate key attribute (type %d).\n", type);
 306                         return -EINVAL;
 307                 }
 308
 309                 expected_len = ovs_key_lens[type];
 310                 if (nla_len(nla) != expected_len && expected_len != -1) {
 311                         OVS_NLERR("Key attribute has unexpected length (type=%d"
 312                                   ", length=%d, expected=%d).\n", type,
 313                                   nla_len(nla), expected_len);
 314                         return -EINVAL;
 315                 }
 316
 317                 if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
 318                         attrs |= 1ULL << type;
 319                         a[type] = nla;
 320                 }
 321         }
 322         if (rem) {
 323                 OVS_NLERR("Message has %d unknown bytes.\n", rem);
 324                 return -EINVAL;
 325         }
 326
 327         *attrsp = attrs;
 328         return 0;
 329 }
 330
 331 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
 332                                    const struct nlattr *a[], u64 *attrsp)
 333 {
 334         return __parse_flow_nlattrs(attr, a, attrsp, true);
 335 }
 336
 337 static int parse_flow_nlattrs(const struct nlattr *attr,
 338                               const struct nlattr *a[], u64 *attrsp)
 339 {
 340         return __parse_flow_nlattrs(attr, a, attrsp, false);
 341 }
 342
 343 static int ipv4_tun_from_nlattr(const struct nlattr *attr,
 344                                 struct sw_flow_match *match, bool is_mask)
 345 {
 346         struct nlattr *a;
 347         int rem;
 348         bool ttl = false;
 349         __be16 tun_flags = 0;
 350
 351         nla_for_each_nested(a, attr, rem) {
 352                 int type = nla_type(a);
 353                 static const u32 ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
 354                         [OVS_TUNNEL_KEY_ATTR_ID] = sizeof(u64),
 355                         [OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = sizeof(u32),
 356                         [OVS_TUNNEL_KEY_ATTR_IPV4_DST] = sizeof(u32),
 357                         [OVS_TUNNEL_KEY_ATTR_TOS] = 1,
 358                         [OVS_TUNNEL_KEY_ATTR_TTL] = 1,
 359                         [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = 0,
 360                         [OVS_TUNNEL_KEY_ATTR_CSUM] = 0,
 361                 };
 362
 363                 if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
 364                         OVS_NLERR("Unknown IPv4 tunnel attribute (type=%d, max=%d).\n",
 365                         type, OVS_TUNNEL_KEY_ATTR_MAX);
 366                         return -EINVAL;
 367                 }
 368
 369                 if (ovs_tunnel_key_lens[type] != nla_len(a)) {
 370                         OVS_NLERR("IPv4 tunnel attribute type has unexpected "
 371                                   " length (type=%d, length=%d, expected=%d).\n",
 372                                   type, nla_len(a), ovs_tunnel_key_lens[type]);
 373                         return -EINVAL;
 374                 }
 375
 376                 switch (type) {
 377                 case OVS_TUNNEL_KEY_ATTR_ID:
 378                         SW_FLOW_KEY_PUT(match, tun_key.tun_id,
 379                                         nla_get_be64(a), is_mask);
 380                         tun_flags |= TUNNEL_KEY;
 381                         break;
 382                 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
 383                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_src,
 384                                         nla_get_be32(a), is_mask);
 385                         break;
 386                 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
 387                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst,
 388                                         nla_get_be32(a), is_mask);
 389                         break;
 390                 case OVS_TUNNEL_KEY_ATTR_TOS:
 391                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos,
 392                                         nla_get_u8(a), is_mask);
 393                         break;
 394                 case OVS_TUNNEL_KEY_ATTR_TTL:
 395                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_ttl,
 396                                         nla_get_u8(a), is_mask);
 397                         ttl = true;
 398                         break;
 399                 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
 400                         tun_flags |= TUNNEL_DONT_FRAGMENT;
 401                         break;
 402                 case OVS_TUNNEL_KEY_ATTR_CSUM:
 403                         tun_flags |= TUNNEL_CSUM;
 404                         break;
 405                 default:
 406                         return -EINVAL;
 407                 }
 408         }
 409
 410         SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
 411
 412         if (rem > 0) {
 413                 OVS_NLERR("IPv4 tunnel attribute has %d unknown bytes.\n", rem);
 414                 return -EINVAL;
 415         }
 416
 417         if (!is_mask) {
 418                 if (!match->key->tun_key.ipv4_dst) {
 419                         OVS_NLERR("IPv4 tunnel destination address is zero.\n");
 420                         return -EINVAL;
 421                 }
 422
 423                 if (!ttl) {
 424                         OVS_NLERR("IPv4 tunnel TTL not specified.\n");
 425                         return -EINVAL;
 426                 }
 427         }
 428
 429         return 0;
 430 }
 431
 432 static int ipv4_tun_to_nlattr(struct sk_buff *skb,
 433                               const struct ovs_key_ipv4_tunnel *tun_key,
 434                               const struct ovs_key_ipv4_tunnel *output)
 435 {
 436         struct nlattr *nla;
 437
 438         nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
 439         if (!nla)
 440                 return -EMSGSIZE;
 441
 442         if (output->tun_flags & TUNNEL_KEY &&
 443             nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id))
 444                 return -EMSGSIZE;
 445         if (output->ipv4_src &&
 446                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src))
 447                 return -EMSGSIZE;
 448         if (output->ipv4_dst &&
 449                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst))
 450                 return -EMSGSIZE;
 451         if (output->ipv4_tos &&
 452                 nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->ipv4_tos))
 453                 return -EMSGSIZE;
 454         if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl))
 455                 return -EMSGSIZE;
 456         if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
 457                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
 458                 return -EMSGSIZE;
 459         if ((output->tun_flags & TUNNEL_CSUM) &&
 460                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
 461                 return -EMSGSIZE;
 462
 463         nla_nest_end(skb, nla);
 464         return 0;
 465 }
 466
 467
 468 static int metadata_from_nlattrs(struct sw_flow_match *match,  u64 *attrs,
 469                                  const struct nlattr **a, bool is_mask)
 470 {
 471         if (*attrs & (1ULL << OVS_KEY_ATTR_PRIORITY)) {
 472                 SW_FLOW_KEY_PUT(match, phy.priority,
 473                           nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
 474                 *attrs &= ~(1ULL << OVS_KEY_ATTR_PRIORITY);
 475         }
 476
 477         if (*attrs & (1ULL << OVS_KEY_ATTR_IN_PORT)) {
 478                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
 479
 480                 if (is_mask)
 481                         in_port = 0xffffffff; /* Always exact match in_port. */
 482                 else if (in_port >= DP_MAX_PORTS)
 483                         return -EINVAL;
 484
 485                 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
 486                 *attrs &= ~(1ULL << OVS_KEY_ATTR_IN_PORT);
 487         } else if (!is_mask) {
 488                 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
 489         }
 490
 491         if (*attrs & (1ULL << OVS_KEY_ATTR_SKB_MARK)) {
 492                 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
 493
 494                 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
 495                 *attrs &= ~(1ULL << OVS_KEY_ATTR_SKB_MARK);
 496         }
 497         if (*attrs & (1ULL << OVS_KEY_ATTR_TUNNEL)) {
 498                 if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
 499                                          is_mask))
 500                         return -EINVAL;
 501                 *attrs &= ~(1ULL << OVS_KEY_ATTR_TUNNEL);
 502         }
 503         return 0;
 504 }
 505
 506 static int ovs_key_from_nlattrs(struct sw_flow_match *match,  bool *exact_5tuple,
 507                                 u64 attrs, const struct nlattr **a,
 508                                 bool is_mask)
 509 {
 510         int err;
 511         u64 orig_attrs = attrs;
 512
 513         err = metadata_from_nlattrs(match, &attrs, a, is_mask);
 514         if (err)
 515                 return err;
 516
 517         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) {
 518                 const struct ovs_key_ethernet *eth_key;
 519
 520                 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
 521                 SW_FLOW_KEY_MEMCPY(match, eth.src,
 522                                 eth_key->eth_src, ETH_ALEN, is_mask);
 523                 SW_FLOW_KEY_MEMCPY(match, eth.dst,
 524                                 eth_key->eth_dst, ETH_ALEN, is_mask);
 525                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERNET);
 526         }
 527
 528         if (attrs & (1ULL << OVS_KEY_ATTR_VLAN)) {
 529                 __be16 tci;
 530
 531                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 532                 if (!(tci & htons(VLAN_TAG_PRESENT))) {
 533                         if (is_mask)
 534                                 OVS_NLERR("VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.\n");
 535                         else
 536                                 OVS_NLERR("VLAN TCI does not have VLAN_TAG_PRESENT bit set.\n");
 537
 538                         return -EINVAL;
 539                 }
 540
 541                 SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
 542                 attrs &= ~(1ULL << OVS_KEY_ATTR_VLAN);
 543         } else if (!is_mask)
 544                 SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
 545
 546         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) {
 547                 __be16 eth_type;
 548
 549                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 550                 if (is_mask) {
 551                         /* Always exact match EtherType. */
 552                         eth_type = htons(0xffff);
 553                 } else if (ntohs(eth_type) < ETH_P_802_3_MIN) {
 554                         OVS_NLERR("EtherType is less than minimum (type=%x, min=%x).\n",
 555                                         ntohs(eth_type), ETH_P_802_3_MIN);
 556                         return -EINVAL;
 557                 }
 558
 559                 SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
 560                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 561         } else if (!is_mask) {
 562                 SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
 563         }
 564
 565         if (is_mask && exact_5tuple) {
 566                 if (match->mask->key.eth.type != htons(0xffff))
 567                         *exact_5tuple = false;
 568         }
 569
 570         if (attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 571                 const struct ovs_key_ipv4 *ipv4_key;
 572
 573                 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
 574                 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
 575                         OVS_NLERR("Unknown IPv4 fragment type (value=%d, max=%d).\n",
 576                                 ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
 577                         return -EINVAL;
 578                 }
 579                 SW_FLOW_KEY_PUT(match, ip.proto,
 580                                 ipv4_key->ipv4_proto, is_mask);
 581                 SW_FLOW_KEY_PUT(match, ip.tos,
 582                                 ipv4_key->ipv4_tos, is_mask);
 583                 SW_FLOW_KEY_PUT(match, ip.ttl,
 584                                 ipv4_key->ipv4_ttl, is_mask);
 585                 SW_FLOW_KEY_PUT(match, ip.frag,
 586                                 ipv4_key->ipv4_frag, is_mask);
 587                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 588                                 ipv4_key->ipv4_src, is_mask);
 589                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 590                                 ipv4_key->ipv4_dst, is_mask);
 591                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV4);
 592
 593                 if (is_mask && exact_5tuple && *exact_5tuple) {
 594                         if (ipv4_key->ipv4_proto != 0xff ||
 595                             ipv4_key->ipv4_src != htonl(0xffffffff) ||
 596                             ipv4_key->ipv4_dst != htonl(0xffffffff))
 597                                 *exact_5tuple = false;
 598                 }
 599         }
 600
 601         if (attrs & (1ULL << OVS_KEY_ATTR_IPV6)) {
 602                 const struct ovs_key_ipv6 *ipv6_key;
 603
 604                 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
 605                 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
 606                         OVS_NLERR("Unknown IPv6 fragment type (value=%d, max=%d).\n",
 607                                 ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
 608                         return -EINVAL;
 609                 }
 610                 SW_FLOW_KEY_PUT(match, ipv6.label,
 611                                 ipv6_key->ipv6_label, is_mask);
 612                 SW_FLOW_KEY_PUT(match, ip.proto,
 613                                 ipv6_key->ipv6_proto, is_mask);
 614                 SW_FLOW_KEY_PUT(match, ip.tos,
 615                                 ipv6_key->ipv6_tclass, is_mask);
 616                 SW_FLOW_KEY_PUT(match, ip.ttl,
 617                                 ipv6_key->ipv6_hlimit, is_mask);
 618                 SW_FLOW_KEY_PUT(match, ip.frag,
 619                                 ipv6_key->ipv6_frag, is_mask);
 620                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
 621                                 ipv6_key->ipv6_src,
 622                                 sizeof(match->key->ipv6.addr.src),
 623                                 is_mask);
 624                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
 625                                 ipv6_key->ipv6_dst,
 626                                 sizeof(match->key->ipv6.addr.dst),
 627                                 is_mask);
 628
 629                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV6);
 630
 631                 if (is_mask && exact_5tuple && *exact_5tuple) {
 632                         if (ipv6_key->ipv6_proto != 0xff ||
 633                             !is_all_set((const u8 *)ipv6_key->ipv6_src,
 634                                         sizeof(match->key->ipv6.addr.src)) ||
 635                             !is_all_set((const u8 *)ipv6_key->ipv6_dst,
 636                                         sizeof(match->key->ipv6.addr.dst)))
 637                                 *exact_5tuple = false;
 638                 }
 639         }
 640
 641         if (attrs & (1ULL << OVS_KEY_ATTR_ARP)) {
 642                 const struct ovs_key_arp *arp_key;
 643
 644                 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
 645                 if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
 646                         OVS_NLERR("Unknown ARP opcode (opcode=%d).\n",
 647                                   arp_key->arp_op);
 648                         return -EINVAL;
 649                 }
 650
 651                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 652                                 arp_key->arp_sip, is_mask);
 653                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 654                         arp_key->arp_tip, is_mask);
 655                 SW_FLOW_KEY_PUT(match, ip.proto,
 656                                 ntohs(arp_key->arp_op), is_mask);
 657                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
 658                                 arp_key->arp_sha, ETH_ALEN, is_mask);
 659                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
 660                                 arp_key->arp_tha, ETH_ALEN, is_mask);
 661
 662                 attrs &= ~(1ULL << OVS_KEY_ATTR_ARP);
 663         }
 664
 665         if (attrs & (1ULL << OVS_KEY_ATTR_TCP)) {
 666                 const struct ovs_key_tcp *tcp_key;
 667
 668                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
 669                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 670                         SW_FLOW_KEY_PUT(match, ipv4.tp.src,
 671                                         tcp_key->tcp_src, is_mask);
 672                         SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
 673                                         tcp_key->tcp_dst, is_mask);
 674                 } else {
 675                         SW_FLOW_KEY_PUT(match, ipv6.tp.src,
 676                                         tcp_key->tcp_src, is_mask);
 677                         SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
 678                                         tcp_key->tcp_dst, is_mask);
 679                 }
 680                 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP);
 681
 682                 if (is_mask && exact_5tuple && *exact_5tuple &&
 683                     (tcp_key->tcp_src != htons(0xffff) ||
 684                      tcp_key->tcp_dst != htons(0xffff)))
 685                         *exact_5tuple = false;
 686         }
 687
 688         if (attrs & (1ULL << OVS_KEY_ATTR_TCP_FLAGS)) {
 689                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 690                         SW_FLOW_KEY_PUT(match, ipv4.tp.flags,
 691                                         nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
 692                                         is_mask);
 693                 } else {
 694                         SW_FLOW_KEY_PUT(match, ipv6.tp.flags,
 695                                         nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
 696                                         is_mask);
 697                 }
 698                 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP_FLAGS);
 699         }
 700
 701         if (attrs & (1ULL << OVS_KEY_ATTR_UDP)) {
 702                 const struct ovs_key_udp *udp_key;
 703
 704                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
 705                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 706                         SW_FLOW_KEY_PUT(match, ipv4.tp.src,
 707                                         udp_key->udp_src, is_mask);
 708                         SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
 709                                         udp_key->udp_dst, is_mask);
 710                 } else {
 711                         SW_FLOW_KEY_PUT(match, ipv6.tp.src,
 712                                         udp_key->udp_src, is_mask);
 713                         SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
 714                                         udp_key->udp_dst, is_mask);
 715                 }
 716                 attrs &= ~(1ULL << OVS_KEY_ATTR_UDP);
 717
 718                 if (is_mask && exact_5tuple && *exact_5tuple &&
 719                     (udp_key->udp_src != htons(0xffff) ||
 720                      udp_key->udp_dst != htons(0xffff)))
 721                         *exact_5tuple = false;
 722         }
 723
 724         if (attrs & (1ULL << OVS_KEY_ATTR_SCTP)) {
 725                 const struct ovs_key_sctp *sctp_key;
 726
 727                 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
 728                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 729                         SW_FLOW_KEY_PUT(match, ipv4.tp.src,
 730                                         sctp_key->sctp_src, is_mask);
 731                         SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
 732                                         sctp_key->sctp_dst, is_mask);
 733                 } else {
 734                         SW_FLOW_KEY_PUT(match, ipv6.tp.src,
 735                                         sctp_key->sctp_src, is_mask);
 736                         SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
 737                                         sctp_key->sctp_dst, is_mask);
 738                 }
 739                 attrs &= ~(1ULL << OVS_KEY_ATTR_SCTP);
 740         }
 741
 742         if (attrs & (1ULL << OVS_KEY_ATTR_ICMP)) {
 743                 const struct ovs_key_icmp *icmp_key;
 744
 745                 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
 746                 SW_FLOW_KEY_PUT(match, ipv4.tp.src,
 747                                 htons(icmp_key->icmp_type), is_mask);
 748                 SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
 749                                 htons(icmp_key->icmp_code), is_mask);
 750                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMP);
 751         }
 752
 753         if (attrs & (1ULL << OVS_KEY_ATTR_ICMPV6)) {
 754                 const struct ovs_key_icmpv6 *icmpv6_key;
 755
 756                 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
 757                 SW_FLOW_KEY_PUT(match, ipv6.tp.src,
 758                                 htons(icmpv6_key->icmpv6_type), is_mask);
 759                 SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
 760                                 htons(icmpv6_key->icmpv6_code), is_mask);
 761                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMPV6);
 762         }
 763
 764         if (attrs & (1ULL << OVS_KEY_ATTR_ND)) {
 765                 const struct ovs_key_nd *nd_key;
 766
 767                 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
 768                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
 769                         nd_key->nd_target,
 770                         sizeof(match->key->ipv6.nd.target),
 771                         is_mask);
 772                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
 773                         nd_key->nd_sll, ETH_ALEN, is_mask);
 774                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
 775                                 nd_key->nd_tll, ETH_ALEN, is_mask);
 776                 attrs &= ~(1ULL << OVS_KEY_ATTR_ND);
 777         }
 778
 779         if (attrs != 0)
 780                 return -EINVAL;
 781
 782         return 0;
 783 }
 784
 785 static void sw_flow_mask_set(struct sw_flow_mask *mask,
 786                              struct sw_flow_key_range *range, u8 val)
 787 {
 788         u8 *m = (u8 *)&mask->key + range->start;
 789
 790         mask->range = *range;
 791         memset(m, val, range_n_bytes(range));
 792 }
 793
 794 /**
 795  * ovs_nla_get_match - parses Netlink attributes into a flow key and
 796  * mask. In case the 'mask' is NULL, the flow is treated as exact match
 797  * flow. Otherwise, it is treated as a wildcarded flow, except the mask
 798  * does not include any don't care bit.
 799  * @match: receives the extracted flow match information.
 800  * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
 801  * sequence. The fields should of the packet that triggered the creation
 802  * of this flow.
 803  * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
 804  * attribute specifies the mask field of the wildcarded flow.
 805  */
 806 int ovs_nla_get_match(struct sw_flow_match *match,
 807                       bool *exact_5tuple,
 808                       const struct nlattr *key,
 809                       const struct nlattr *mask)
 810 {
 811         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
 812         const struct nlattr *encap;
 813         u64 key_attrs = 0;
 814         u64 mask_attrs = 0;
 815         bool encap_valid = false;
 816         int err;
 817
 818         err = parse_flow_nlattrs(key, a, &key_attrs);
 819         if (err)
 820                 return err;
 821
 822         if ((key_attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) &&
 823             (key_attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) &&
 824             (nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
 825                 __be16 tci;
 826
 827                 if (!((key_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) &&
 828                       (key_attrs & (1ULL << OVS_KEY_ATTR_ENCAP)))) {
 829                         OVS_NLERR("Invalid Vlan frame.\n");
 830                         return -EINVAL;
 831                 }
 832
 833                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 834                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 835                 encap = a[OVS_KEY_ATTR_ENCAP];
 836                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
 837                 encap_valid = true;
 838
 839                 if (tci & htons(VLAN_TAG_PRESENT)) {
 840                         err = parse_flow_nlattrs(encap, a, &key_attrs);
 841                         if (err)
 842                                 return err;
 843                 } else if (!tci) {
 844                         /* Corner case for truncated 802.1Q header. */
 845                         if (nla_len(encap)) {
 846                                 OVS_NLERR("Truncated 802.1Q header has non-zero encap attribute.\n");
 847                                 return -EINVAL;
 848                         }
 849                 } else {
 850                         OVS_NLERR("Encap attribute is set for a non-VLAN frame.\n");
 851                         return  -EINVAL;
 852                 }
 853         }
 854
 855         err = ovs_key_from_nlattrs(match, NULL, key_attrs, a, false);
 856         if (err)
 857                 return err;
 858
 859         if (exact_5tuple)
 860                 *exact_5tuple = true;
 861
 862         if (mask) {
 863                 err = parse_flow_mask_nlattrs(mask, a, &mask_attrs);
 864                 if (err)
 865                         return err;
 866
 867                 if (mask_attrs & 1ULL << OVS_KEY_ATTR_ENCAP)  {
 868                         __be16 eth_type = 0;
 869                         __be16 tci = 0;
 870
 871                         if (!encap_valid) {
 872                                 OVS_NLERR("Encap mask attribute is set for non-VLAN frame.\n");
 873                                 return  -EINVAL;
 874                         }
 875
 876                         mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
 877                         if (a[OVS_KEY_ATTR_ETHERTYPE])
 878                                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 879
 880                         if (eth_type == htons(0xffff)) {
 881                                 mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 882                                 encap = a[OVS_KEY_ATTR_ENCAP];
 883                                 err = parse_flow_mask_nlattrs(encap, a, &mask_attrs);
 884                         } else {
 885                                 OVS_NLERR("VLAN frames must have an exact match on the TPID (mask=%x).\n",
 886                                                 ntohs(eth_type));
 887                                 return -EINVAL;
 888                         }
 889
 890                         if (a[OVS_KEY_ATTR_VLAN])
 891                                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 892
 893                         if (!(tci & htons(VLAN_TAG_PRESENT))) {
 894                                 OVS_NLERR("VLAN tag present bit must have an exact match (tci_mask=%x).\n", ntohs(tci));
 895                                 return -EINVAL;
 896                         }
 897                 }
 898
 899                 err = ovs_key_from_nlattrs(match, exact_5tuple, mask_attrs, a, true);
 900                 if (err)
 901                         return err;
 902         } else {
 903                 /* Populate exact match flow's key mask. */
 904                 if (match->mask)
 905                         sw_flow_mask_set(match->mask, &match->range, 0xff);
 906         }
 907
 908         if (!match_validate(match, key_attrs, mask_attrs))
 909                 return -EINVAL;
 910
 911         return 0;
 912 }
 913
 914 /**
 915  * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
 916  * @flow: Receives extracted in_port, priority, tun_key and skb_mark.
 917  * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
 918  * sequence.
 919  *
 920  * This parses a series of Netlink attributes that form a flow key, which must
 921  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
 922  * get the metadata, that is, the parts of the flow key that cannot be
 923  * extracted from the packet itself.
 924  */
 925
 926 int ovs_nla_get_flow_metadata(struct sw_flow *flow,
 927                               const struct nlattr *attr)
 928 {
 929         struct ovs_key_ipv4_tunnel *tun_key = &flow->key.tun_key;
 930         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
 931         u64 attrs = 0;
 932         int err;
 933         struct sw_flow_match match;
 934
 935         flow->key.phy.in_port = DP_MAX_PORTS;
 936         flow->key.phy.priority = 0;
 937         flow->key.phy.skb_mark = 0;
 938         memset(tun_key, 0, sizeof(flow->key.tun_key));
 939
 940         err = parse_flow_nlattrs(attr, a, &attrs);
 941         if (err)
 942                 return -EINVAL;
 943
 944         memset(&match, 0, sizeof(match));
 945         match.key = &flow->key;
 946
 947         err = metadata_from_nlattrs(&match, &attrs, a, false);
 948         if (err)
 949                 return err;
 950
 951         return 0;
 952 }
 953
 954 int ovs_nla_put_flow(const struct sw_flow_key *swkey,
 955                      const struct sw_flow_key *output, struct sk_buff *skb)
 956 {
 957         struct ovs_key_ethernet *eth_key;
 958         struct nlattr *nla, *encap;
 959         bool is_mask = (swkey != output);
 960
 961         if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
 962                 goto nla_put_failure;
 963
 964         if ((swkey->tun_key.ipv4_dst || is_mask) &&
 965             ipv4_tun_to_nlattr(skb, &swkey->tun_key, &output->tun_key))
 966                 goto nla_put_failure;
 967
 968         if (swkey->phy.in_port == DP_MAX_PORTS) {
 969                 if (is_mask && (output->phy.in_port == 0xffff))
 970                         if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
 971                                 goto nla_put_failure;
 972         } else {
 973                 u16 upper_u16;
 974                 upper_u16 = !is_mask ? 0 : 0xffff;
 975
 976                 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
 977                                 (upper_u16 << 16) | output->phy.in_port))
 978                         goto nla_put_failure;
 979         }
 980
 981         if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
 982                 goto nla_put_failure;
 983
 984         nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
 985         if (!nla)
 986                 goto nla_put_failure;
 987
 988         eth_key = nla_data(nla);
 989         memcpy(eth_key->eth_src, output->eth.src, ETH_ALEN);
 990         memcpy(eth_key->eth_dst, output->eth.dst, ETH_ALEN);
 991
 992         if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
 993                 __be16 eth_type;
 994                 eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff);
 995                 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
 996                     nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
 997                         goto nla_put_failure;
 998                 encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
 999                 if (!swkey->eth.tci)
1000                         goto unencap;
1001         } else
1002                 encap = NULL;
1003
1004         if (swkey->eth.type == htons(ETH_P_802_2)) {
1005                 /*
1006                  * Ethertype 802.2 is represented in the netlink with omitted
1007                  * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
1008                  * 0xffff in the mask attribute.  Ethertype can also
1009                  * be wildcarded.
1010                  */
1011                 if (is_mask && output->eth.type)
1012                         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
1013                                                 output->eth.type))
1014                                 goto nla_put_failure;
1015                 goto unencap;
1016         }
1017
1018         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
1019                 goto nla_put_failure;
1020
1021         if (swkey->eth.type == htons(ETH_P_IP)) {
1022                 struct ovs_key_ipv4 *ipv4_key;
1023
1024                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
1025                 if (!nla)
1026                         goto nla_put_failure;
1027                 ipv4_key = nla_data(nla);
1028                 ipv4_key->ipv4_src = output->ipv4.addr.src;
1029                 ipv4_key->ipv4_dst = output->ipv4.addr.dst;
1030                 ipv4_key->ipv4_proto = output->ip.proto;
1031                 ipv4_key->ipv4_tos = output->ip.tos;
1032                 ipv4_key->ipv4_ttl = output->ip.ttl;
1033                 ipv4_key->ipv4_frag = output->ip.frag;
1034         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1035                 struct ovs_key_ipv6 *ipv6_key;
1036
1037                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
1038                 if (!nla)
1039                         goto nla_put_failure;
1040                 ipv6_key = nla_data(nla);
1041                 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
1042                                 sizeof(ipv6_key->ipv6_src));
1043                 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
1044                                 sizeof(ipv6_key->ipv6_dst));
1045                 ipv6_key->ipv6_label = output->ipv6.label;
1046                 ipv6_key->ipv6_proto = output->ip.proto;
1047                 ipv6_key->ipv6_tclass = output->ip.tos;
1048                 ipv6_key->ipv6_hlimit = output->ip.ttl;
1049                 ipv6_key->ipv6_frag = output->ip.frag;
1050         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
1051                    swkey->eth.type == htons(ETH_P_RARP)) {
1052                 struct ovs_key_arp *arp_key;
1053
1054                 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
1055                 if (!nla)
1056                         goto nla_put_failure;
1057                 arp_key = nla_data(nla);
1058                 memset(arp_key, 0, sizeof(struct ovs_key_arp));
1059                 arp_key->arp_sip = output->ipv4.addr.src;
1060                 arp_key->arp_tip = output->ipv4.addr.dst;
1061                 arp_key->arp_op = htons(output->ip.proto);
1062                 memcpy(arp_key->arp_sha, output->ipv4.arp.sha, ETH_ALEN);
1063                 memcpy(arp_key->arp_tha, output->ipv4.arp.tha, ETH_ALEN);
1064         }
1065
1066         if ((swkey->eth.type == htons(ETH_P_IP) ||
1067              swkey->eth.type == htons(ETH_P_IPV6)) &&
1068              swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1069
1070                 if (swkey->ip.proto == IPPROTO_TCP) {
1071                         struct ovs_key_tcp *tcp_key;
1072
1073                         nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
1074                         if (!nla)
1075                                 goto nla_put_failure;
1076                         tcp_key = nla_data(nla);
1077                         if (swkey->eth.type == htons(ETH_P_IP)) {
1078                                 tcp_key->tcp_src = output->ipv4.tp.src;
1079                                 tcp_key->tcp_dst = output->ipv4.tp.dst;
1080                                 if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
1081                                                  output->ipv4.tp.flags))
1082                                         goto nla_put_failure;
1083                         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1084                                 tcp_key->tcp_src = output->ipv6.tp.src;
1085                                 tcp_key->tcp_dst = output->ipv6.tp.dst;
1086                                 if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
1087                                                  output->ipv6.tp.flags))
1088                                         goto nla_put_failure;
1089                         }
1090                 } else if (swkey->ip.proto == IPPROTO_UDP) {
1091                         struct ovs_key_udp *udp_key;
1092
1093                         nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
1094                         if (!nla)
1095                                 goto nla_put_failure;
1096                         udp_key = nla_data(nla);
1097                         if (swkey->eth.type == htons(ETH_P_IP)) {
1098                                 udp_key->udp_src = output->ipv4.tp.src;
1099                                 udp_key->udp_dst = output->ipv4.tp.dst;
1100                         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1101                                 udp_key->udp_src = output->ipv6.tp.src;
1102                                 udp_key->udp_dst = output->ipv6.tp.dst;
1103                         }
1104                 } else if (swkey->ip.proto == IPPROTO_SCTP) {
1105                         struct ovs_key_sctp *sctp_key;
1106
1107                         nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
1108                         if (!nla)
1109                                 goto nla_put_failure;
1110                         sctp_key = nla_data(nla);
1111                         if (swkey->eth.type == htons(ETH_P_IP)) {
1112                                 sctp_key->sctp_src = swkey->ipv4.tp.src;
1113                                 sctp_key->sctp_dst = swkey->ipv4.tp.dst;
1114                         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1115                                 sctp_key->sctp_src = swkey->ipv6.tp.src;
1116                                 sctp_key->sctp_dst = swkey->ipv6.tp.dst;
1117                         }
1118                 } else if (swkey->eth.type == htons(ETH_P_IP) &&
1119                            swkey->ip.proto == IPPROTO_ICMP) {
1120                         struct ovs_key_icmp *icmp_key;
1121
1122                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
1123                         if (!nla)
1124                                 goto nla_put_failure;
1125                         icmp_key = nla_data(nla);
1126                         icmp_key->icmp_type = ntohs(output->ipv4.tp.src);
1127                         icmp_key->icmp_code = ntohs(output->ipv4.tp.dst);
1128                 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
1129                            swkey->ip.proto == IPPROTO_ICMPV6) {
1130                         struct ovs_key_icmpv6 *icmpv6_key;
1131
1132                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
1133                                                 sizeof(*icmpv6_key));
1134                         if (!nla)
1135                                 goto nla_put_failure;
1136                         icmpv6_key = nla_data(nla);
1137                         icmpv6_key->icmpv6_type = ntohs(output->ipv6.tp.src);
1138                         icmpv6_key->icmpv6_code = ntohs(output->ipv6.tp.dst);
1139
1140                         if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
1141                             icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
1142                                 struct ovs_key_nd *nd_key;
1143
1144                                 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
1145                                 if (!nla)
1146                                         goto nla_put_failure;
1147                                 nd_key = nla_data(nla);
1148                                 memcpy(nd_key->nd_target, &output->ipv6.nd.target,
1149                                                         sizeof(nd_key->nd_target));
1150                                 memcpy(nd_key->nd_sll, output->ipv6.nd.sll, ETH_ALEN);
1151                                 memcpy(nd_key->nd_tll, output->ipv6.nd.tll, ETH_ALEN);
1152                         }
1153                 }
1154         }
1155
1156 unencap:
1157         if (encap)
1158                 nla_nest_end(skb, encap);
1159
1160         return 0;
1161
1162 nla_put_failure:
1163         return -EMSGSIZE;
1164 }
1165
1166 #define MAX_ACTIONS_BUFSIZE     (32 * 1024)
1167
1168 struct sw_flow_actions *ovs_nla_alloc_flow_actions(int size)
1169 {
1170         struct sw_flow_actions *sfa;
1171
1172         if (size > MAX_ACTIONS_BUFSIZE)
1173                 return ERR_PTR(-EINVAL);
1174
1175         sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
1176         if (!sfa)
1177                 return ERR_PTR(-ENOMEM);
1178
1179         sfa->actions_len = 0;
1180         return sfa;
1181 }
1182
1183 /* RCU callback used by ovs_nla_free_flow_actions. */
1184 static void rcu_free_acts_callback(struct rcu_head *rcu)
1185 {
1186         struct sw_flow_actions *sf_acts = container_of(rcu,
1187                         struct sw_flow_actions, rcu);
1188         kfree(sf_acts);
1189 }
1190
1191 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
1192  * The caller must hold rcu_read_lock for this to be sensible. */
1193 void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
1194 {
1195         call_rcu(&sf_acts->rcu, rcu_free_acts_callback);
1196 }
1197
1198 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
1199                                        int attr_len)
1200 {
1201
1202         struct sw_flow_actions *acts;
1203         int new_acts_size;
1204         int req_size = NLA_ALIGN(attr_len);
1205         int next_offset = offsetof(struct sw_flow_actions, actions) +
1206                                         (*sfa)->actions_len;
1207
1208         if (req_size <= (ksize(*sfa) - next_offset))
1209                 goto out;
1210
1211         new_acts_size = ksize(*sfa) * 2;
1212
1213         if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
1214                 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
1215                         return ERR_PTR(-EMSGSIZE);
1216                 new_acts_size = MAX_ACTIONS_BUFSIZE;
1217         }
1218
1219         acts = ovs_nla_alloc_flow_actions(new_acts_size);
1220         if (IS_ERR(acts))
1221                 return (void *)acts;
1222
1223         memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
1224         acts->actions_len = (*sfa)->actions_len;
1225         kfree(*sfa);
1226         *sfa = acts;
1227
1228 out:
1229         (*sfa)->actions_len += req_size;
1230         return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
1231 }
1232
1233 static int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len)
1234 {
1235         struct nlattr *a;
1236
1237         a = reserve_sfa_size(sfa, nla_attr_size(len));
1238         if (IS_ERR(a))
1239                 return PTR_ERR(a);
1240
1241         a->nla_type = attrtype;
1242         a->nla_len = nla_attr_size(len);
1243
1244         if (data)
1245                 memcpy(nla_data(a), data, len);
1246         memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
1247
1248         return 0;
1249 }
1250
1251 static inline int add_nested_action_start(struct sw_flow_actions **sfa,
1252                                           int attrtype)
1253 {
1254         int used = (*sfa)->actions_len;
1255         int err;
1256
1257         err = add_action(sfa, attrtype, NULL, 0);
1258         if (err)
1259                 return err;
1260
1261         return used;
1262 }
1263
1264 static inline void add_nested_action_end(struct sw_flow_actions *sfa,
1265                                          int st_offset)
1266 {
1267         struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
1268                                                                st_offset);
1269
1270         a->nla_len = sfa->actions_len - st_offset;
1271 }
1272
1273 static int validate_and_copy_sample(const struct nlattr *attr,
1274                                     const struct sw_flow_key *key, int depth,
1275                                     struct sw_flow_actions **sfa)
1276 {
1277         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
1278         const struct nlattr *probability, *actions;
1279         const struct nlattr *a;
1280         int rem, start, err, st_acts;
1281
1282         memset(attrs, 0, sizeof(attrs));
1283         nla_for_each_nested(a, attr, rem) {
1284                 int type = nla_type(a);
1285                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
1286                         return -EINVAL;
1287                 attrs[type] = a;
1288         }
1289         if (rem)
1290                 return -EINVAL;
1291
1292         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
1293         if (!probability || nla_len(probability) != sizeof(u32))
1294                 return -EINVAL;
1295
1296         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
1297         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
1298                 return -EINVAL;
1299
1300         /* validation done, copy sample action. */
1301         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE);
1302         if (start < 0)
1303                 return start;
1304         err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY,
1305                          nla_data(probability), sizeof(u32));
1306         if (err)
1307                 return err;
1308         st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
1309         if (st_acts < 0)
1310                 return st_acts;
1311
1312         err = ovs_nla_copy_actions(actions, key, depth + 1, sfa);
1313         if (err)
1314                 return err;
1315
1316         add_nested_action_end(*sfa, st_acts);
1317         add_nested_action_end(*sfa, start);
1318
1319         return 0;
1320 }
1321
1322 static int validate_tp_port(const struct sw_flow_key *flow_key)
1323 {
1324         if (flow_key->eth.type == htons(ETH_P_IP)) {
1325                 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
1326                         return 0;
1327         } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
1328                 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
1329                         return 0;
1330         }
1331
1332         return -EINVAL;
1333 }
1334
1335 void ovs_match_init(struct sw_flow_match *match,
1336                     struct sw_flow_key *key,
1337                     struct sw_flow_mask *mask)
1338 {
1339         memset(match, 0, sizeof(*match));
1340         match->key = key;
1341         match->mask = mask;
1342
1343         memset(key, 0, sizeof(*key));
1344
1345         if (mask) {
1346                 memset(&mask->key, 0, sizeof(mask->key));
1347                 mask->range.start = mask->range.end = 0;
1348         }
1349 }
1350
1351 static int validate_and_copy_set_tun(const struct nlattr *attr,
1352                                      struct sw_flow_actions **sfa)
1353 {
1354         struct sw_flow_match match;
1355         struct sw_flow_key key;
1356         int err, start;
1357
1358         ovs_match_init(&match, &key, NULL);
1359         err = ipv4_tun_from_nlattr(nla_data(attr), &match, false);
1360         if (err)
1361                 return err;
1362
1363         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
1364         if (start < 0)
1365                 return start;
1366
1367         err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &match.key->tun_key,
1368                         sizeof(match.key->tun_key));
1369         add_nested_action_end(*sfa, start);
1370
1371         return err;
1372 }
1373
1374 static int validate_set(const struct nlattr *a,
1375                         const struct sw_flow_key *flow_key,
1376                         struct sw_flow_actions **sfa,
1377                         bool *set_tun)
1378 {
1379         const struct nlattr *ovs_key = nla_data(a);
1380         int key_type = nla_type(ovs_key);
1381
1382         /* There can be only one key in a action */
1383         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
1384                 return -EINVAL;
1385
1386         if (key_type > OVS_KEY_ATTR_MAX ||
1387             (ovs_key_lens[key_type] != nla_len(ovs_key) &&
1388              ovs_key_lens[key_type] != -1))
1389                 return -EINVAL;
1390
1391         switch (key_type) {
1392         const struct ovs_key_ipv4 *ipv4_key;
1393         const struct ovs_key_ipv6 *ipv6_key;
1394         int err;
1395
1396         case OVS_KEY_ATTR_PRIORITY:
1397         case OVS_KEY_ATTR_SKB_MARK:
1398         case OVS_KEY_ATTR_ETHERNET:
1399                 break;
1400
1401         case OVS_KEY_ATTR_TUNNEL:
1402                 *set_tun = true;
1403                 err = validate_and_copy_set_tun(a, sfa);
1404                 if (err)
1405                         return err;
1406                 break;
1407
1408         case OVS_KEY_ATTR_IPV4:
1409                 if (flow_key->eth.type != htons(ETH_P_IP))
1410                         return -EINVAL;
1411
1412                 if (!flow_key->ip.proto)
1413                         return -EINVAL;
1414
1415                 ipv4_key = nla_data(ovs_key);
1416                 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
1417                         return -EINVAL;
1418
1419                 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
1420                         return -EINVAL;
1421
1422                 break;
1423
1424         case OVS_KEY_ATTR_IPV6:
1425                 if (flow_key->eth.type != htons(ETH_P_IPV6))
1426                         return -EINVAL;
1427
1428                 if (!flow_key->ip.proto)
1429                         return -EINVAL;
1430
1431                 ipv6_key = nla_data(ovs_key);
1432                 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
1433                         return -EINVAL;
1434
1435                 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
1436                         return -EINVAL;
1437
1438                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
1439                         return -EINVAL;
1440
1441                 break;
1442
1443         case OVS_KEY_ATTR_TCP:
1444                 if (flow_key->ip.proto != IPPROTO_TCP)
1445                         return -EINVAL;
1446
1447                 return validate_tp_port(flow_key);
1448
1449         case OVS_KEY_ATTR_UDP:
1450                 if (flow_key->ip.proto != IPPROTO_UDP)
1451                         return -EINVAL;
1452
1453                 return validate_tp_port(flow_key);
1454
1455         case OVS_KEY_ATTR_SCTP:
1456                 if (flow_key->ip.proto != IPPROTO_SCTP)
1457                         return -EINVAL;
1458
1459                 return validate_tp_port(flow_key);
1460
1461         default:
1462                 return -EINVAL;
1463         }
1464
1465         return 0;
1466 }
1467
1468 static int validate_userspace(const struct nlattr *attr)
1469 {
1470         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
1471                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
1472                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
1473         };
1474         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
1475         int error;
1476
1477         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
1478                                  attr, userspace_policy);
1479         if (error)
1480                 return error;
1481
1482         if (!a[OVS_USERSPACE_ATTR_PID] ||
1483             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
1484                 return -EINVAL;
1485
1486         return 0;
1487 }
1488
1489 static int copy_action(const struct nlattr *from,
1490                        struct sw_flow_actions **sfa)
1491 {
1492         int totlen = NLA_ALIGN(from->nla_len);
1493         struct nlattr *to;
1494
1495         to = reserve_sfa_size(sfa, from->nla_len);
1496         if (IS_ERR(to))
1497                 return PTR_ERR(to);
1498
1499         memcpy(to, from, totlen);
1500         return 0;
1501 }
1502
1503 int ovs_nla_copy_actions(const struct nlattr *attr,
1504                          const struct sw_flow_key *key,
1505                          int depth,
1506                          struct sw_flow_actions **sfa)
1507 {
1508         const struct nlattr *a;
1509         int rem, err;
1510
1511         if (depth >= SAMPLE_ACTION_DEPTH)
1512                 return -EOVERFLOW;
1513
1514         nla_for_each_nested(a, attr, rem) {
1515                 /* Expected argument lengths, (u32)-1 for variable length. */
1516                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
1517                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
1518                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
1519                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
1520                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
1521                         [OVS_ACTION_ATTR_SET] = (u32)-1,
1522                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
1523                 };
1524                 const struct ovs_action_push_vlan *vlan;
1525                 int type = nla_type(a);
1526                 bool skip_copy;
1527
1528                 if (type > OVS_ACTION_ATTR_MAX ||
1529                     (action_lens[type] != nla_len(a) &&
1530                      action_lens[type] != (u32)-1))
1531                         return -EINVAL;
1532
1533                 skip_copy = false;
1534                 switch (type) {
1535                 case OVS_ACTION_ATTR_UNSPEC:
1536                         return -EINVAL;
1537
1538                 case OVS_ACTION_ATTR_USERSPACE:
1539                         err = validate_userspace(a);
1540                         if (err)
1541                                 return err;
1542                         break;
1543
1544                 case OVS_ACTION_ATTR_OUTPUT:
1545                         if (nla_get_u32(a) >= DP_MAX_PORTS)
1546                                 return -EINVAL;
1547                         break;
1548
1549
1550                 case OVS_ACTION_ATTR_POP_VLAN:
1551                         break;
1552
1553                 case OVS_ACTION_ATTR_PUSH_VLAN:
1554                         vlan = nla_data(a);
1555                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
1556                                 return -EINVAL;
1557                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
1558                                 return -EINVAL;
1559                         break;
1560
1561                 case OVS_ACTION_ATTR_SET:
1562                         err = validate_set(a, key, sfa, &skip_copy);
1563                         if (err)
1564                                 return err;
1565                         break;
1566
1567                 case OVS_ACTION_ATTR_SAMPLE:
1568                         err = validate_and_copy_sample(a, key, depth, sfa);
1569                         if (err)
1570                                 return err;
1571                         skip_copy = true;
1572                         break;
1573
1574                 default:
1575                         return -EINVAL;
1576                 }
1577                 if (!skip_copy) {
1578                         err = copy_action(a, sfa);
1579                         if (err)
1580                                 return err;
1581                 }
1582         }
1583
1584         if (rem > 0)
1585                 return -EINVAL;
1586
1587         return 0;
1588 }
1589
1590 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
1591 {
1592         const struct nlattr *a;
1593         struct nlattr *start;
1594         int err = 0, rem;
1595
1596         start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
1597         if (!start)
1598                 return -EMSGSIZE;
1599
1600         nla_for_each_nested(a, attr, rem) {
1601                 int type = nla_type(a);
1602                 struct nlattr *st_sample;
1603
1604                 switch (type) {
1605                 case OVS_SAMPLE_ATTR_PROBABILITY:
1606                         if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY,
1607                                     sizeof(u32), nla_data(a)))
1608                                 return -EMSGSIZE;
1609                         break;
1610                 case OVS_SAMPLE_ATTR_ACTIONS:
1611                         st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
1612                         if (!st_sample)
1613                                 return -EMSGSIZE;
1614                         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
1615                         if (err)
1616                                 return err;
1617                         nla_nest_end(skb, st_sample);
1618                         break;
1619                 }
1620         }
1621
1622         nla_nest_end(skb, start);
1623         return err;
1624 }
1625
1626 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
1627 {
1628         const struct nlattr *ovs_key = nla_data(a);
1629         int key_type = nla_type(ovs_key);
1630         struct nlattr *start;
1631         int err;
1632
1633         switch (key_type) {
1634         case OVS_KEY_ATTR_IPV4_TUNNEL:
1635                 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
1636                 if (!start)
1637                         return -EMSGSIZE;
1638
1639                 err = ipv4_tun_to_nlattr(skb, nla_data(ovs_key),
1640                                              nla_data(ovs_key));
1641                 if (err)
1642                         return err;
1643                 nla_nest_end(skb, start);
1644                 break;
1645         default:
1646                 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
1647                         return -EMSGSIZE;
1648                 break;
1649         }
1650
1651         return 0;
1652 }
1653
1654 int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
1655 {
1656         const struct nlattr *a;
1657         int rem, err;
1658
1659         nla_for_each_attr(a, attr, len, rem) {
1660                 int type = nla_type(a);
1661
1662                 switch (type) {
1663                 case OVS_ACTION_ATTR_SET:
1664                         err = set_action_to_attr(a, skb);
1665                         if (err)
1666                                 return err;
1667                         break;
1668
1669                 case OVS_ACTION_ATTR_SAMPLE:
1670                         err = sample_action_to_attr(a, skb);
1671                         if (err)
1672                                 return err;
1673                         break;
1674                 default:
1675                         if (nla_put(skb, type, nla_len(a), nla_data(a)))
1676                                 return -EMSGSIZE;
1677                         break;
1678                 }
1679         }
1680
1681         return 0;
1682 }