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 #include "flow.h"
  20 #include "datapath.h"
  21 #include <linux/uaccess.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/etherdevice.h>
  24 #include <linux/if_ether.h>
  25 #include <linux/if_vlan.h>
  26 #include <net/llc_pdu.h>
  27 #include <linux/kernel.h>
  28 #include <linux/jhash.h>
  29 #include <linux/jiffies.h>
  30 #include <linux/llc.h>
  31 #include <linux/module.h>
  32 #include <linux/in.h>
  33 #include <linux/rcupdate.h>
  34 #include <linux/if_arp.h>
  35 #include <linux/ip.h>
  36 #include <linux/ipv6.h>
  37 #include <linux/sctp.h>
  38 #include <linux/tcp.h>
  39 #include <linux/udp.h>
  40 #include <linux/icmp.h>
  41 #include <linux/icmpv6.h>
  42 #include <linux/rculist.h>
  43 #include <net/ip.h>
  44 #include <net/ipv6.h>
  45 #include <net/ndisc.h>
  46
  47 #include "flow_netlink.h"
  48
  49 static void update_range__(struct sw_flow_match *match,
  50                            size_t offset, size_t size, bool is_mask)
  51 {
  52         struct sw_flow_key_range *range = NULL;
  53         size_t start = rounddown(offset, sizeof(long));
  54         size_t end = roundup(offset + size, sizeof(long));
  55
  56         if (!is_mask)
  57                 range = &match->range;
  58         else if (match->mask)
  59                 range = &match->mask->range;
  60
  61         if (!range)
  62                 return;
  63
  64         if (range->start == range->end) {
  65                 range->start = start;
  66                 range->end = end;
  67                 return;
  68         }
  69
  70         if (range->start > start)
  71                 range->start = start;
  72
  73         if (range->end < end)
  74                 range->end = end;
  75 }
  76
  77 #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
  78         do { \
  79                 update_range__(match, offsetof(struct sw_flow_key, field),  \
  80                                      sizeof((match)->key->field), is_mask); \
  81                 if (is_mask) {                                              \
  82                         if ((match)->mask)                                  \
  83                                 (match)->mask->key.field = value;           \
  84                 } else {                                                    \
  85                         (match)->key->field = value;                        \
  86                 }                                                           \
  87         } while (0)
  88
  89 #define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask) \
  90         do { \
  91                 update_range__(match, offsetof(struct sw_flow_key, field),  \
  92                                 len, is_mask);                              \
  93                 if (is_mask) {                                              \
  94                         if ((match)->mask)                                  \
  95                                 memcpy(&(match)->mask->key.field, value_p, len);\
  96                 } else {                                                    \
  97                         memcpy(&(match)->key->field, value_p, len);         \
  98                 }                                                           \
  99         } while (0)
 100
 101 static u16 range_n_bytes(const struct sw_flow_key_range *range)
 102 {
 103         return range->end - range->start;
 104 }
 105
 106 static bool match_validate(const struct sw_flow_match *match,
 107                            u64 key_attrs, u64 mask_attrs)
 108 {
 109         u64 key_expected = 1ULL << OVS_KEY_ATTR_ETHERNET;
 110         u64 mask_allowed = key_attrs;  /* At most allow all key attributes */
 111
 112         /* The following mask attributes allowed only if they
 113          * pass the validation tests. */
 114         mask_allowed &= ~((1ULL << OVS_KEY_ATTR_IPV4)
 115                         | (1ULL << OVS_KEY_ATTR_IPV6)
 116                         | (1ULL << OVS_KEY_ATTR_TCP)
 117                         | (1ULL << OVS_KEY_ATTR_TCP_FLAGS)
 118                         | (1ULL << OVS_KEY_ATTR_UDP)
 119                         | (1ULL << OVS_KEY_ATTR_SCTP)
 120                         | (1ULL << OVS_KEY_ATTR_ICMP)
 121                         | (1ULL << OVS_KEY_ATTR_ICMPV6)
 122                         | (1ULL << OVS_KEY_ATTR_ARP)
 123                         | (1ULL << OVS_KEY_ATTR_ND));
 124
 125         /* Always allowed mask fields. */
 126         mask_allowed |= ((1ULL << OVS_KEY_ATTR_TUNNEL)
 127                        | (1ULL << OVS_KEY_ATTR_IN_PORT)
 128                        | (1ULL << OVS_KEY_ATTR_ETHERTYPE));
 129
 130         /* Check key attributes. */
 131         if (match->key->eth.type == htons(ETH_P_ARP)
 132                         || match->key->eth.type == htons(ETH_P_RARP)) {
 133                 key_expected |= 1ULL << OVS_KEY_ATTR_ARP;
 134                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 135                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ARP;
 136         }
 137
 138         if (match->key->eth.type == htons(ETH_P_IP)) {
 139                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV4;
 140                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 141                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV4;
 142
 143                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 144                         if (match->key->ip.proto == IPPROTO_UDP) {
 145                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 146                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 147                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 148                         }
 149
 150                         if (match->key->ip.proto == IPPROTO_SCTP) {
 151                                 key_expected |= 1ULL << OVS_KEY_ATTR_SCTP;
 152                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 153                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_SCTP;
 154                         }
 155
 156                         if (match->key->ip.proto == IPPROTO_TCP) {
 157                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 158                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 159                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 160                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 161                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 162                                 }
 163                         }
 164
 165                         if (match->key->ip.proto == IPPROTO_ICMP) {
 166                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMP;
 167                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 168                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMP;
 169                         }
 170                 }
 171         }
 172
 173         if (match->key->eth.type == htons(ETH_P_IPV6)) {
 174                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV6;
 175                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 176                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV6;
 177
 178                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 179                         if (match->key->ip.proto == IPPROTO_UDP) {
 180                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 181                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 182                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 183                         }
 184
 185                         if (match->key->ip.proto == IPPROTO_SCTP) {
 186                                 key_expected |= 1ULL << OVS_KEY_ATTR_SCTP;
 187                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 188                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_SCTP;
 189                         }
 190
 191                         if (match->key->ip.proto == IPPROTO_TCP) {
 192                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 193                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 194                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 195                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 196                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 197                                 }
 198                         }
 199
 200                         if (match->key->ip.proto == IPPROTO_ICMPV6) {
 201                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 202                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 203                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 204
 205                                 if (match->key->ipv6.tp.src ==
 206                                                 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 207                                     match->key->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 208                                         key_expected |= 1ULL << OVS_KEY_ATTR_ND;
 209                                         if (match->mask && (match->mask->key.ipv6.tp.src == htons(0xffff)))
 210                                                 mask_allowed |= 1ULL << OVS_KEY_ATTR_ND;
 211                                 }
 212                         }
 213                 }
 214         }
 215
 216         if ((key_attrs & key_expected) != key_expected) {
 217                 /* Key attributes check failed. */
 218                 OVS_NLERR("Missing expected key attributes (key_attrs=%llx, expected=%llx).\n",
 219                                 key_attrs, key_expected);
 220                 return false;
 221         }
 222
 223         if ((mask_attrs & mask_allowed) != mask_attrs) {
 224                 /* Mask attributes check failed. */
 225                 OVS_NLERR("Contain more than allowed mask fields (mask_attrs=%llx, mask_allowed=%llx).\n",
 226                                 mask_attrs, mask_allowed);
 227                 return false;
 228         }
 229
 230         return true;
 231 }
 232
 233 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
 234 static const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
 235         [OVS_KEY_ATTR_ENCAP] = -1,
 236         [OVS_KEY_ATTR_PRIORITY] = sizeof(u32),
 237         [OVS_KEY_ATTR_IN_PORT] = sizeof(u32),
 238         [OVS_KEY_ATTR_SKB_MARK] = sizeof(u32),
 239         [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet),
 240         [OVS_KEY_ATTR_VLAN] = sizeof(__be16),
 241         [OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16),
 242         [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
 243         [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
 244         [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
 245         [OVS_KEY_ATTR_TCP_FLAGS] = sizeof(__be16),
 246         [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
 247         [OVS_KEY_ATTR_SCTP] = sizeof(struct ovs_key_sctp),
 248         [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
 249         [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
 250         [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
 251         [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
 252         [OVS_KEY_ATTR_TUNNEL] = -1,
 253 };
 254
 255 static bool is_all_zero(const u8 *fp, size_t size)
 256 {
 257         int i;
 258
 259         if (!fp)
 260                 return false;
 261
 262         for (i = 0; i < size; i++)
 263                 if (fp[i])
 264                         return false;
 265
 266         return true;
 267 }
 268
 269 static bool is_all_set(const u8 *fp, size_t size)
 270 {
 271         int i;
 272
 273         if (!fp)
 274                 return false;
 275
 276         for (i = 0; i < size; i++)
 277                 if (fp[i] != 0xff)
 278                         return false;
 279
 280         return true;
 281 }
 282
 283 static int __parse_flow_nlattrs(const struct nlattr *attr,
 284                                 const struct nlattr *a[],
 285                                 u64 *attrsp, bool nz)
 286 {
 287         const struct nlattr *nla;
 288         u64 attrs;
 289         int rem;
 290
 291         attrs = *attrsp;
 292         nla_for_each_nested(nla, attr, rem) {
 293                 u16 type = nla_type(nla);
 294                 int expected_len;
 295
 296                 if (type > OVS_KEY_ATTR_MAX) {
 297                         OVS_NLERR("Unknown key attribute (type=%d, max=%d).\n",
 298                                   type, OVS_KEY_ATTR_MAX);
 299                         return -EINVAL;
 300                 }
 301
 302                 if (attrs & (1ULL << type)) {
 303                         OVS_NLERR("Duplicate key attribute (type %d).\n", type);
 304                         return -EINVAL;
 305                 }
 306
 307                 expected_len = ovs_key_lens[type];
 308                 if (nla_len(nla) != expected_len && expected_len != -1) {
 309                         OVS_NLERR("Key attribute has unexpected length (type=%d"
 310                                   ", length=%d, expected=%d).\n", type,
 311                                   nla_len(nla), expected_len);
 312                         return -EINVAL;
 313                 }
 314
 315                 if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
 316                         attrs |= 1ULL << type;
 317                         a[type] = nla;
 318                 }
 319         }
 320         if (rem) {
 321                 OVS_NLERR("Message has %d unknown bytes.\n", rem);
 322                 return -EINVAL;
 323         }
 324
 325         *attrsp = attrs;
 326         return 0;
 327 }
 328
 329 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
 330                                    const struct nlattr *a[], u64 *attrsp)
 331 {
 332         return __parse_flow_nlattrs(attr, a, attrsp, true);
 333 }
 334
 335 static int parse_flow_nlattrs(const struct nlattr *attr,
 336                               const struct nlattr *a[], u64 *attrsp)
 337 {
 338         return __parse_flow_nlattrs(attr, a, attrsp, false);
 339 }
 340
 341 static int ipv4_tun_from_nlattr(const struct nlattr *attr,
 342                                 struct sw_flow_match *match, bool is_mask)
 343 {
 344         struct nlattr *a;
 345         int rem;
 346         bool ttl = false;
 347         __be16 tun_flags = 0;
 348
 349         nla_for_each_nested(a, attr, rem) {
 350                 int type = nla_type(a);
 351                 static const u32 ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
 352                         [OVS_TUNNEL_KEY_ATTR_ID] = sizeof(u64),
 353                         [OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = sizeof(u32),
 354                         [OVS_TUNNEL_KEY_ATTR_IPV4_DST] = sizeof(u32),
 355                         [OVS_TUNNEL_KEY_ATTR_TOS] = 1,
 356                         [OVS_TUNNEL_KEY_ATTR_TTL] = 1,
 357                         [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = 0,
 358                         [OVS_TUNNEL_KEY_ATTR_CSUM] = 0,
 359                 };
 360
 361                 if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
 362                         OVS_NLERR("Unknown IPv4 tunnel attribute (type=%d, max=%d).\n",
 363                         type, OVS_TUNNEL_KEY_ATTR_MAX);
 364                         return -EINVAL;
 365                 }
 366
 367                 if (ovs_tunnel_key_lens[type] != nla_len(a)) {
 368                         OVS_NLERR("IPv4 tunnel attribute type has unexpected "
 369                                   " length (type=%d, length=%d, expected=%d).\n",
 370                                   type, nla_len(a), ovs_tunnel_key_lens[type]);
 371                         return -EINVAL;
 372                 }
 373
 374                 switch (type) {
 375                 case OVS_TUNNEL_KEY_ATTR_ID:
 376                         SW_FLOW_KEY_PUT(match, tun_key.tun_id,
 377                                         nla_get_be64(a), is_mask);
 378                         tun_flags |= TUNNEL_KEY;
 379                         break;
 380                 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
 381                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_src,
 382                                         nla_get_be32(a), is_mask);
 383                         break;
 384                 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
 385                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst,
 386                                         nla_get_be32(a), is_mask);
 387                         break;
 388                 case OVS_TUNNEL_KEY_ATTR_TOS:
 389                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos,
 390                                         nla_get_u8(a), is_mask);
 391                         break;
 392                 case OVS_TUNNEL_KEY_ATTR_TTL:
 393                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_ttl,
 394                                         nla_get_u8(a), is_mask);
 395                         ttl = true;
 396                         break;
 397                 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
 398                         tun_flags |= TUNNEL_DONT_FRAGMENT;
 399                         break;
 400                 case OVS_TUNNEL_KEY_ATTR_CSUM:
 401                         tun_flags |= TUNNEL_CSUM;
 402                         break;
 403                 default:
 404                         return -EINVAL;
 405                 }
 406         }
 407
 408         SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
 409
 410         if (rem > 0) {
 411                 OVS_NLERR("IPv4 tunnel attribute has %d unknown bytes.\n", rem);
 412                 return -EINVAL;
 413         }
 414
 415         if (!is_mask) {
 416                 if (!match->key->tun_key.ipv4_dst) {
 417                         OVS_NLERR("IPv4 tunnel destination address is zero.\n");
 418                         return -EINVAL;
 419                 }
 420
 421                 if (!ttl) {
 422                         OVS_NLERR("IPv4 tunnel TTL not specified.\n");
 423                         return -EINVAL;
 424                 }
 425         }
 426
 427         return 0;
 428 }
 429
 430 static int ipv4_tun_to_nlattr(struct sk_buff *skb,
 431                               const struct ovs_key_ipv4_tunnel *tun_key,
 432                               const struct ovs_key_ipv4_tunnel *output)
 433 {
 434         struct nlattr *nla;
 435
 436         nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
 437         if (!nla)
 438                 return -EMSGSIZE;
 439
 440         if (output->tun_flags & TUNNEL_KEY &&
 441             nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id))
 442                 return -EMSGSIZE;
 443         if (output->ipv4_src &&
 444                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src))
 445                 return -EMSGSIZE;
 446         if (output->ipv4_dst &&
 447                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst))
 448                 return -EMSGSIZE;
 449         if (output->ipv4_tos &&
 450                 nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->ipv4_tos))
 451                 return -EMSGSIZE;
 452         if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl))
 453                 return -EMSGSIZE;
 454         if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
 455                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
 456                 return -EMSGSIZE;
 457         if ((output->tun_flags & TUNNEL_CSUM) &&
 458                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
 459                 return -EMSGSIZE;
 460
 461         nla_nest_end(skb, nla);
 462         return 0;
 463 }
 464
 465
 466 static int metadata_from_nlattrs(struct sw_flow_match *match,  u64 *attrs,
 467                                  const struct nlattr **a, bool is_mask)
 468 {
 469         if (*attrs & (1ULL << OVS_KEY_ATTR_PRIORITY)) {
 470                 SW_FLOW_KEY_PUT(match, phy.priority,
 471                           nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
 472                 *attrs &= ~(1ULL << OVS_KEY_ATTR_PRIORITY);
 473         }
 474
 475         if (*attrs & (1ULL << OVS_KEY_ATTR_IN_PORT)) {
 476                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
 477
 478                 if (is_mask)
 479                         in_port = 0xffffffff; /* Always exact match in_port. */
 480                 else if (in_port >= DP_MAX_PORTS)
 481                         return -EINVAL;
 482
 483                 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
 484                 *attrs &= ~(1ULL << OVS_KEY_ATTR_IN_PORT);
 485         } else if (!is_mask) {
 486                 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
 487         }
 488
 489         if (*attrs & (1ULL << OVS_KEY_ATTR_SKB_MARK)) {
 490                 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
 491
 492                 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
 493                 *attrs &= ~(1ULL << OVS_KEY_ATTR_SKB_MARK);
 494         }
 495         if (*attrs & (1ULL << OVS_KEY_ATTR_TUNNEL)) {
 496                 if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
 497                                          is_mask))
 498                         return -EINVAL;
 499                 *attrs &= ~(1ULL << OVS_KEY_ATTR_TUNNEL);
 500         }
 501         return 0;
 502 }
 503
 504 static int ovs_key_from_nlattrs(struct sw_flow_match *match,  bool *exact_5tuple,
 505                                 u64 attrs, const struct nlattr **a,
 506                                 bool is_mask)
 507 {
 508         int err;
 509         u64 orig_attrs = attrs;
 510
 511         err = metadata_from_nlattrs(match, &attrs, a, is_mask);
 512         if (err)
 513                 return err;
 514
 515         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) {
 516                 const struct ovs_key_ethernet *eth_key;
 517
 518                 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
 519                 SW_FLOW_KEY_MEMCPY(match, eth.src,
 520                                 eth_key->eth_src, ETH_ALEN, is_mask);
 521                 SW_FLOW_KEY_MEMCPY(match, eth.dst,
 522                                 eth_key->eth_dst, ETH_ALEN, is_mask);
 523                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERNET);
 524         }
 525
 526         if (attrs & (1ULL << OVS_KEY_ATTR_VLAN)) {
 527                 __be16 tci;
 528
 529                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 530                 if (!(tci & htons(VLAN_TAG_PRESENT))) {
 531                         if (is_mask)
 532                                 OVS_NLERR("VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.\n");
 533                         else
 534                                 OVS_NLERR("VLAN TCI does not have VLAN_TAG_PRESENT bit set.\n");
 535
 536                         return -EINVAL;
 537                 }
 538
 539                 SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
 540                 attrs &= ~(1ULL << OVS_KEY_ATTR_VLAN);
 541         } else if (!is_mask)
 542                 SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
 543
 544         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) {
 545                 __be16 eth_type;
 546
 547                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 548                 if (is_mask) {
 549                         /* Always exact match EtherType. */
 550                         eth_type = htons(0xffff);
 551                 } else if (ntohs(eth_type) < ETH_P_802_3_MIN) {
 552                         OVS_NLERR("EtherType is less than minimum (type=%x, min=%x).\n",
 553                                         ntohs(eth_type), ETH_P_802_3_MIN);
 554                         return -EINVAL;
 555                 }
 556
 557                 SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
 558                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 559         } else if (!is_mask) {
 560                 SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
 561         }
 562
 563         if (is_mask && exact_5tuple) {
 564                 if (match->mask->key.eth.type != htons(0xffff))
 565                         *exact_5tuple = false;
 566         }
 567
 568         if (attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 569                 const struct ovs_key_ipv4 *ipv4_key;
 570
 571                 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
 572                 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
 573                         OVS_NLERR("Unknown IPv4 fragment type (value=%d, max=%d).\n",
 574                                 ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
 575                         return -EINVAL;
 576                 }
 577                 SW_FLOW_KEY_PUT(match, ip.proto,
 578                                 ipv4_key->ipv4_proto, is_mask);
 579                 SW_FLOW_KEY_PUT(match, ip.tos,
 580                                 ipv4_key->ipv4_tos, is_mask);
 581                 SW_FLOW_KEY_PUT(match, ip.ttl,
 582                                 ipv4_key->ipv4_ttl, is_mask);
 583                 SW_FLOW_KEY_PUT(match, ip.frag,
 584                                 ipv4_key->ipv4_frag, is_mask);
 585                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 586                                 ipv4_key->ipv4_src, is_mask);
 587                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 588                                 ipv4_key->ipv4_dst, is_mask);
 589                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV4);
 590
 591                 if (is_mask && exact_5tuple && *exact_5tuple) {
 592                         if (ipv4_key->ipv4_proto != 0xff ||
 593                             ipv4_key->ipv4_src != htonl(0xffffffff) ||
 594                             ipv4_key->ipv4_dst != htonl(0xffffffff))
 595                                 *exact_5tuple = false;
 596                 }
 597         }
 598
 599         if (attrs & (1ULL << OVS_KEY_ATTR_IPV6)) {
 600                 const struct ovs_key_ipv6 *ipv6_key;
 601
 602                 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
 603                 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
 604                         OVS_NLERR("Unknown IPv6 fragment type (value=%d, max=%d).\n",
 605                                 ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
 606                         return -EINVAL;
 607                 }
 608                 SW_FLOW_KEY_PUT(match, ipv6.label,
 609                                 ipv6_key->ipv6_label, is_mask);
 610                 SW_FLOW_KEY_PUT(match, ip.proto,
 611                                 ipv6_key->ipv6_proto, is_mask);
 612                 SW_FLOW_KEY_PUT(match, ip.tos,
 613                                 ipv6_key->ipv6_tclass, is_mask);
 614                 SW_FLOW_KEY_PUT(match, ip.ttl,
 615                                 ipv6_key->ipv6_hlimit, is_mask);
 616                 SW_FLOW_KEY_PUT(match, ip.frag,
 617                                 ipv6_key->ipv6_frag, is_mask);
 618                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
 619                                 ipv6_key->ipv6_src,
 620                                 sizeof(match->key->ipv6.addr.src),
 621                                 is_mask);
 622                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
 623                                 ipv6_key->ipv6_dst,
 624                                 sizeof(match->key->ipv6.addr.dst),
 625                                 is_mask);
 626
 627                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV6);
 628
 629                 if (is_mask && exact_5tuple && *exact_5tuple) {
 630                         if (ipv6_key->ipv6_proto != 0xff ||
 631                             !is_all_set((u8 *)ipv6_key->ipv6_src, sizeof(match->key->ipv6.addr.src)) ||
 632                             !is_all_set((u8 *)ipv6_key->ipv6_dst, sizeof(match->key->ipv6.addr.dst)))
 633                                 *exact_5tuple = false;
 634                 }
 635         }
 636
 637         if (attrs & (1ULL << OVS_KEY_ATTR_ARP)) {
 638                 const struct ovs_key_arp *arp_key;
 639
 640                 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
 641                 if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
 642                         OVS_NLERR("Unknown ARP opcode (opcode=%d).\n",
 643                                   arp_key->arp_op);
 644                         return -EINVAL;
 645                 }
 646
 647                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 648                                 arp_key->arp_sip, is_mask);
 649                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 650                         arp_key->arp_tip, is_mask);
 651                 SW_FLOW_KEY_PUT(match, ip.proto,
 652                                 ntohs(arp_key->arp_op), is_mask);
 653                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
 654                                 arp_key->arp_sha, ETH_ALEN, is_mask);
 655                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
 656                                 arp_key->arp_tha, ETH_ALEN, is_mask);
 657
 658                 attrs &= ~(1ULL << OVS_KEY_ATTR_ARP);
 659         }
 660
 661         if (attrs & (1ULL << OVS_KEY_ATTR_TCP)) {
 662                 const struct ovs_key_tcp *tcp_key;
 663
 664                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
 665                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 666                         SW_FLOW_KEY_PUT(match, ipv4.tp.src,
 667                                         tcp_key->tcp_src, is_mask);
 668                         SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
 669                                         tcp_key->tcp_dst, is_mask);
 670                 } else {
 671                         SW_FLOW_KEY_PUT(match, ipv6.tp.src,
 672                                         tcp_key->tcp_src, is_mask);
 673                         SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
 674                                         tcp_key->tcp_dst, is_mask);
 675                 }
 676                 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP);
 677
 678                 if (is_mask && exact_5tuple && *exact_5tuple &&
 679                     (tcp_key->tcp_src != htons(0xffff) ||
 680                      tcp_key->tcp_dst != htons(0xffff)))
 681                         *exact_5tuple = false;
 682         }
 683
 684         if (attrs & (1ULL << OVS_KEY_ATTR_TCP_FLAGS)) {
 685                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 686                         SW_FLOW_KEY_PUT(match, ipv4.tp.flags,
 687                                         nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
 688                                         is_mask);
 689                 } else {
 690                         SW_FLOW_KEY_PUT(match, ipv6.tp.flags,
 691                                         nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
 692                                         is_mask);
 693                 }
 694                 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP_FLAGS);
 695         }
 696
 697         if (attrs & (1ULL << OVS_KEY_ATTR_UDP)) {
 698                 const struct ovs_key_udp *udp_key;
 699
 700                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
 701                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 702                         SW_FLOW_KEY_PUT(match, ipv4.tp.src,
 703                                         udp_key->udp_src, is_mask);
 704                         SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
 705                                         udp_key->udp_dst, is_mask);
 706                 } else {
 707                         SW_FLOW_KEY_PUT(match, ipv6.tp.src,
 708                                         udp_key->udp_src, is_mask);
 709                         SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
 710                                         udp_key->udp_dst, is_mask);
 711                 }
 712                 attrs &= ~(1ULL << OVS_KEY_ATTR_UDP);
 713
 714                 if (is_mask && exact_5tuple && *exact_5tuple &&
 715                     (udp_key->udp_src != htons(0xffff) ||
 716                      udp_key->udp_dst != htons(0xffff)))
 717                         *exact_5tuple = false;
 718         }
 719
 720         if (attrs & (1ULL << OVS_KEY_ATTR_SCTP)) {
 721                 const struct ovs_key_sctp *sctp_key;
 722
 723                 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
 724                 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 725                         SW_FLOW_KEY_PUT(match, ipv4.tp.src,
 726                                         sctp_key->sctp_src, is_mask);
 727                         SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
 728                                         sctp_key->sctp_dst, is_mask);
 729                 } else {
 730                         SW_FLOW_KEY_PUT(match, ipv6.tp.src,
 731                                         sctp_key->sctp_src, is_mask);
 732                         SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
 733                                         sctp_key->sctp_dst, is_mask);
 734                 }
 735                 attrs &= ~(1ULL << OVS_KEY_ATTR_SCTP);
 736         }
 737
 738         if (attrs & (1ULL << OVS_KEY_ATTR_ICMP)) {
 739                 const struct ovs_key_icmp *icmp_key;
 740
 741                 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
 742                 SW_FLOW_KEY_PUT(match, ipv4.tp.src,
 743                                 htons(icmp_key->icmp_type), is_mask);
 744                 SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
 745                                 htons(icmp_key->icmp_code), is_mask);
 746                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMP);
 747         }
 748
 749         if (attrs & (1ULL << OVS_KEY_ATTR_ICMPV6)) {
 750                 const struct ovs_key_icmpv6 *icmpv6_key;
 751
 752                 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
 753                 SW_FLOW_KEY_PUT(match, ipv6.tp.src,
 754                                 htons(icmpv6_key->icmpv6_type), is_mask);
 755                 SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
 756                                 htons(icmpv6_key->icmpv6_code), is_mask);
 757                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMPV6);
 758         }
 759
 760         if (attrs & (1ULL << OVS_KEY_ATTR_ND)) {
 761                 const struct ovs_key_nd *nd_key;
 762
 763                 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
 764                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
 765                         nd_key->nd_target,
 766                         sizeof(match->key->ipv6.nd.target),
 767                         is_mask);
 768                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
 769                         nd_key->nd_sll, ETH_ALEN, is_mask);
 770                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
 771                                 nd_key->nd_tll, ETH_ALEN, is_mask);
 772                 attrs &= ~(1ULL << OVS_KEY_ATTR_ND);
 773         }
 774
 775         if (attrs != 0)
 776                 return -EINVAL;
 777
 778         return 0;
 779 }
 780
 781 static void sw_flow_mask_set(struct sw_flow_mask *mask,
 782                              struct sw_flow_key_range *range, u8 val)
 783 {
 784         u8 *m = (u8 *)&mask->key + range->start;
 785
 786         mask->range = *range;
 787         memset(m, val, range_n_bytes(range));
 788 }
 789
 790 /**
 791  * ovs_nla_get_match - parses Netlink attributes into a flow key and
 792  * mask. In case the 'mask' is NULL, the flow is treated as exact match
 793  * flow. Otherwise, it is treated as a wildcarded flow, except the mask
 794  * does not include any don't care bit.
 795  * @match: receives the extracted flow match information.
 796  * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
 797  * sequence. The fields should of the packet that triggered the creation
 798  * of this flow.
 799  * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
 800  * attribute specifies the mask field of the wildcarded flow.
 801  */
 802 int ovs_nla_get_match(struct sw_flow_match *match,
 803                       bool *exact_5tuple,
 804                       const struct nlattr *key,
 805                       const struct nlattr *mask)
 806 {
 807         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
 808         const struct nlattr *encap;
 809         u64 key_attrs = 0;
 810         u64 mask_attrs = 0;
 811         bool encap_valid = false;
 812         int err;
 813
 814         err = parse_flow_nlattrs(key, a, &key_attrs);
 815         if (err)
 816                 return err;
 817
 818         if ((key_attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) &&
 819             (key_attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) &&
 820             (nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
 821                 __be16 tci;
 822
 823                 if (!((key_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) &&
 824                       (key_attrs & (1ULL << OVS_KEY_ATTR_ENCAP)))) {
 825                         OVS_NLERR("Invalid Vlan frame.\n");
 826                         return -EINVAL;
 827                 }
 828
 829                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 830                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 831                 encap = a[OVS_KEY_ATTR_ENCAP];
 832                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
 833                 encap_valid = true;
 834
 835                 if (tci & htons(VLAN_TAG_PRESENT)) {
 836                         err = parse_flow_nlattrs(encap, a, &key_attrs);
 837                         if (err)
 838                                 return err;
 839                 } else if (!tci) {
 840                         /* Corner case for truncated 802.1Q header. */
 841                         if (nla_len(encap)) {
 842                                 OVS_NLERR("Truncated 802.1Q header has non-zero encap attribute.\n");
 843                                 return -EINVAL;
 844                         }
 845                 } else {
 846                         OVS_NLERR("Encap attribute is set for a non-VLAN frame.\n");
 847                         return  -EINVAL;
 848                 }
 849         }
 850
 851         err = ovs_key_from_nlattrs(match, NULL, key_attrs, a, false);
 852         if (err)
 853                 return err;
 854
 855         if (exact_5tuple)
 856                 *exact_5tuple = true;
 857
 858         if (mask) {
 859                 err = parse_flow_mask_nlattrs(mask, a, &mask_attrs);
 860                 if (err)
 861                         return err;
 862
 863                 if (mask_attrs & 1ULL << OVS_KEY_ATTR_ENCAP)  {
 864                         __be16 eth_type = 0;
 865                         __be16 tci = 0;
 866
 867                         if (!encap_valid) {
 868                                 OVS_NLERR("Encap mask attribute is set for non-VLAN frame.\n");
 869                                 return  -EINVAL;
 870                         }
 871
 872                         mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
 873                         if (a[OVS_KEY_ATTR_ETHERTYPE])
 874                                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 875
 876                         if (eth_type == htons(0xffff)) {
 877                                 mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 878                                 encap = a[OVS_KEY_ATTR_ENCAP];
 879                                 err = parse_flow_mask_nlattrs(encap, a, &mask_attrs);
 880                         } else {
 881                                 OVS_NLERR("VLAN frames must have an exact match on the TPID (mask=%x).\n",
 882                                                 ntohs(eth_type));
 883                                 return -EINVAL;
 884                         }
 885
 886                         if (a[OVS_KEY_ATTR_VLAN])
 887                                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 888
 889                         if (!(tci & htons(VLAN_TAG_PRESENT))) {
 890                                 OVS_NLERR("VLAN tag present bit must have an exact match (tci_mask=%x).\n", ntohs(tci));
 891                                 return -EINVAL;
 892                         }
 893                 }
 894
 895                 err = ovs_key_from_nlattrs(match, exact_5tuple, mask_attrs, a, true);
 896                 if (err)
 897                         return err;
 898         } else {
 899                 /* Populate exact match flow's key mask. */
 900                 if (match->mask)
 901                         sw_flow_mask_set(match->mask, &match->range, 0xff);
 902         }
 903
 904         if (!match_validate(match, key_attrs, mask_attrs))
 905                 return -EINVAL;
 906
 907         return 0;
 908 }
 909
 910 /**
 911  * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
 912  * @flow: Receives extracted in_port, priority, tun_key and skb_mark.
 913  * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
 914  * sequence.
 915  *
 916  * This parses a series of Netlink attributes that form a flow key, which must
 917  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
 918  * get the metadata, that is, the parts of the flow key that cannot be
 919  * extracted from the packet itself.
 920  */
 921
 922 int ovs_nla_get_flow_metadata(struct sw_flow *flow,
 923                               const struct nlattr *attr)
 924 {
 925         struct ovs_key_ipv4_tunnel *tun_key = &flow->key.tun_key;
 926         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
 927         u64 attrs = 0;
 928         int err;
 929         struct sw_flow_match match;
 930
 931         flow->key.phy.in_port = DP_MAX_PORTS;
 932         flow->key.phy.priority = 0;
 933         flow->key.phy.skb_mark = 0;
 934         memset(tun_key, 0, sizeof(flow->key.tun_key));
 935
 936         err = parse_flow_nlattrs(attr, a, &attrs);
 937         if (err)
 938                 return -EINVAL;
 939
 940         memset(&match, 0, sizeof(match));
 941         match.key = &flow->key;
 942
 943         err = metadata_from_nlattrs(&match, &attrs, a, false);
 944         if (err)
 945                 return err;
 946
 947         return 0;
 948 }
 949
 950 int ovs_nla_put_flow(const struct sw_flow_key *swkey,
 951                      const struct sw_flow_key *output, struct sk_buff *skb)
 952 {
 953         struct ovs_key_ethernet *eth_key;
 954         struct nlattr *nla, *encap;
 955         bool is_mask = (swkey != output);
 956
 957         if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
 958                 goto nla_put_failure;
 959
 960         if ((swkey->tun_key.ipv4_dst || is_mask) &&
 961             ipv4_tun_to_nlattr(skb, &swkey->tun_key, &output->tun_key))
 962                 goto nla_put_failure;
 963
 964         if (swkey->phy.in_port == DP_MAX_PORTS) {
 965                 if (is_mask && (output->phy.in_port == 0xffff))
 966                         if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
 967                                 goto nla_put_failure;
 968         } else {
 969                 u16 upper_u16;
 970                 upper_u16 = !is_mask ? 0 : 0xffff;
 971
 972                 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
 973                                 (upper_u16 << 16) | output->phy.in_port))
 974                         goto nla_put_failure;
 975         }
 976
 977         if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
 978                 goto nla_put_failure;
 979
 980         nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
 981         if (!nla)
 982                 goto nla_put_failure;
 983
 984         eth_key = nla_data(nla);
 985         memcpy(eth_key->eth_src, output->eth.src, ETH_ALEN);
 986         memcpy(eth_key->eth_dst, output->eth.dst, ETH_ALEN);
 987
 988         if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
 989                 __be16 eth_type;
 990                 eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff);
 991                 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
 992                     nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
 993                         goto nla_put_failure;
 994                 encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
 995                 if (!swkey->eth.tci)
 996                         goto unencap;
 997         } else
 998                 encap = NULL;
 999
1000         if (swkey->eth.type == htons(ETH_P_802_2)) {
1001                 /*
1002                  * Ethertype 802.2 is represented in the netlink with omitted
1003                  * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
1004                  * 0xffff in the mask attribute.  Ethertype can also
1005                  * be wildcarded.
1006                  */
1007                 if (is_mask && output->eth.type)
1008                         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
1009                                                 output->eth.type))
1010                                 goto nla_put_failure;
1011                 goto unencap;
1012         }
1013
1014         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
1015                 goto nla_put_failure;
1016
1017         if (swkey->eth.type == htons(ETH_P_IP)) {
1018                 struct ovs_key_ipv4 *ipv4_key;
1019
1020                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
1021                 if (!nla)
1022                         goto nla_put_failure;
1023                 ipv4_key = nla_data(nla);
1024                 ipv4_key->ipv4_src = output->ipv4.addr.src;
1025                 ipv4_key->ipv4_dst = output->ipv4.addr.dst;
1026                 ipv4_key->ipv4_proto = output->ip.proto;
1027                 ipv4_key->ipv4_tos = output->ip.tos;
1028                 ipv4_key->ipv4_ttl = output->ip.ttl;
1029                 ipv4_key->ipv4_frag = output->ip.frag;
1030         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1031                 struct ovs_key_ipv6 *ipv6_key;
1032
1033                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
1034                 if (!nla)
1035                         goto nla_put_failure;
1036                 ipv6_key = nla_data(nla);
1037                 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
1038                                 sizeof(ipv6_key->ipv6_src));
1039                 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
1040                                 sizeof(ipv6_key->ipv6_dst));
1041                 ipv6_key->ipv6_label = output->ipv6.label;
1042                 ipv6_key->ipv6_proto = output->ip.proto;
1043                 ipv6_key->ipv6_tclass = output->ip.tos;
1044                 ipv6_key->ipv6_hlimit = output->ip.ttl;
1045                 ipv6_key->ipv6_frag = output->ip.frag;
1046         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
1047                    swkey->eth.type == htons(ETH_P_RARP)) {
1048                 struct ovs_key_arp *arp_key;
1049
1050                 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
1051                 if (!nla)
1052                         goto nla_put_failure;
1053                 arp_key = nla_data(nla);
1054                 memset(arp_key, 0, sizeof(struct ovs_key_arp));
1055                 arp_key->arp_sip = output->ipv4.addr.src;
1056                 arp_key->arp_tip = output->ipv4.addr.dst;
1057                 arp_key->arp_op = htons(output->ip.proto);
1058                 memcpy(arp_key->arp_sha, output->ipv4.arp.sha, ETH_ALEN);
1059                 memcpy(arp_key->arp_tha, output->ipv4.arp.tha, ETH_ALEN);
1060         }
1061
1062         if ((swkey->eth.type == htons(ETH_P_IP) ||
1063              swkey->eth.type == htons(ETH_P_IPV6)) &&
1064              swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1065
1066                 if (swkey->ip.proto == IPPROTO_TCP) {
1067                         struct ovs_key_tcp *tcp_key;
1068
1069                         nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
1070                         if (!nla)
1071                                 goto nla_put_failure;
1072                         tcp_key = nla_data(nla);
1073                         if (swkey->eth.type == htons(ETH_P_IP)) {
1074                                 tcp_key->tcp_src = output->ipv4.tp.src;
1075                                 tcp_key->tcp_dst = output->ipv4.tp.dst;
1076                                 if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
1077                                                  output->ipv4.tp.flags))
1078                                         goto nla_put_failure;
1079                         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1080                                 tcp_key->tcp_src = output->ipv6.tp.src;
1081                                 tcp_key->tcp_dst = output->ipv6.tp.dst;
1082                                 if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
1083                                                  output->ipv6.tp.flags))
1084                                         goto nla_put_failure;
1085                         }
1086                 } else if (swkey->ip.proto == IPPROTO_UDP) {
1087                         struct ovs_key_udp *udp_key;
1088
1089                         nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
1090                         if (!nla)
1091                                 goto nla_put_failure;
1092                         udp_key = nla_data(nla);
1093                         if (swkey->eth.type == htons(ETH_P_IP)) {
1094                                 udp_key->udp_src = output->ipv4.tp.src;
1095                                 udp_key->udp_dst = output->ipv4.tp.dst;
1096                         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1097                                 udp_key->udp_src = output->ipv6.tp.src;
1098                                 udp_key->udp_dst = output->ipv6.tp.dst;
1099                         }
1100                 } else if (swkey->ip.proto == IPPROTO_SCTP) {
1101                         struct ovs_key_sctp *sctp_key;
1102
1103                         nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
1104                         if (!nla)
1105                                 goto nla_put_failure;
1106                         sctp_key = nla_data(nla);
1107                         if (swkey->eth.type == htons(ETH_P_IP)) {
1108                                 sctp_key->sctp_src = swkey->ipv4.tp.src;
1109                                 sctp_key->sctp_dst = swkey->ipv4.tp.dst;
1110                         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1111                                 sctp_key->sctp_src = swkey->ipv6.tp.src;
1112                                 sctp_key->sctp_dst = swkey->ipv6.tp.dst;
1113                         }
1114                 } else if (swkey->eth.type == htons(ETH_P_IP) &&
1115                            swkey->ip.proto == IPPROTO_ICMP) {
1116                         struct ovs_key_icmp *icmp_key;
1117
1118                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
1119                         if (!nla)
1120                                 goto nla_put_failure;
1121                         icmp_key = nla_data(nla);
1122                         icmp_key->icmp_type = ntohs(output->ipv4.tp.src);
1123                         icmp_key->icmp_code = ntohs(output->ipv4.tp.dst);
1124                 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
1125                            swkey->ip.proto == IPPROTO_ICMPV6) {
1126                         struct ovs_key_icmpv6 *icmpv6_key;
1127
1128                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
1129                                                 sizeof(*icmpv6_key));
1130                         if (!nla)
1131                                 goto nla_put_failure;
1132                         icmpv6_key = nla_data(nla);
1133                         icmpv6_key->icmpv6_type = ntohs(output->ipv6.tp.src);
1134                         icmpv6_key->icmpv6_code = ntohs(output->ipv6.tp.dst);
1135
1136                         if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
1137                             icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
1138                                 struct ovs_key_nd *nd_key;
1139
1140                                 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
1141                                 if (!nla)
1142                                         goto nla_put_failure;
1143                                 nd_key = nla_data(nla);
1144                                 memcpy(nd_key->nd_target, &output->ipv6.nd.target,
1145                                                         sizeof(nd_key->nd_target));
1146                                 memcpy(nd_key->nd_sll, output->ipv6.nd.sll, ETH_ALEN);
1147                                 memcpy(nd_key->nd_tll, output->ipv6.nd.tll, ETH_ALEN);
1148                         }
1149                 }
1150         }
1151
1152 unencap:
1153         if (encap)
1154                 nla_nest_end(skb, encap);
1155
1156         return 0;
1157
1158 nla_put_failure:
1159         return -EMSGSIZE;
1160 }
1161
1162 #define MAX_ACTIONS_BUFSIZE     (32 * 1024)
1163
1164 struct sw_flow_actions *ovs_nla_alloc_flow_actions(int size)
1165 {
1166         struct sw_flow_actions *sfa;
1167
1168         if (size > MAX_ACTIONS_BUFSIZE)
1169                 return ERR_PTR(-EINVAL);
1170
1171         sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
1172         if (!sfa)
1173                 return ERR_PTR(-ENOMEM);
1174
1175         sfa->actions_len = 0;
1176         return sfa;
1177 }
1178
1179 /* RCU callback used by ovs_nla_free_flow_actions. */
1180 static void rcu_free_acts_callback(struct rcu_head *rcu)
1181 {
1182         struct sw_flow_actions *sf_acts = container_of(rcu,
1183                         struct sw_flow_actions, rcu);
1184         kfree(sf_acts);
1185 }
1186
1187 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
1188  * The caller must hold rcu_read_lock for this to be sensible. */
1189 void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
1190 {
1191         call_rcu(&sf_acts->rcu, rcu_free_acts_callback);
1192 }
1193
1194 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
1195                                        int attr_len)
1196 {
1197
1198         struct sw_flow_actions *acts;
1199         int new_acts_size;
1200         int req_size = NLA_ALIGN(attr_len);
1201         int next_offset = offsetof(struct sw_flow_actions, actions) +
1202                                         (*sfa)->actions_len;
1203
1204         if (req_size <= (ksize(*sfa) - next_offset))
1205                 goto out;
1206
1207         new_acts_size = ksize(*sfa) * 2;
1208
1209         if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
1210                 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
1211                         return ERR_PTR(-EMSGSIZE);
1212                 new_acts_size = MAX_ACTIONS_BUFSIZE;
1213         }
1214
1215         acts = ovs_nla_alloc_flow_actions(new_acts_size);
1216         if (IS_ERR(acts))
1217                 return (void *)acts;
1218
1219         memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
1220         acts->actions_len = (*sfa)->actions_len;
1221         kfree(*sfa);
1222         *sfa = acts;
1223
1224 out:
1225         (*sfa)->actions_len += req_size;
1226         return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
1227 }
1228
1229 static int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len)
1230 {
1231         struct nlattr *a;
1232
1233         a = reserve_sfa_size(sfa, nla_attr_size(len));
1234         if (IS_ERR(a))
1235                 return PTR_ERR(a);
1236
1237         a->nla_type = attrtype;
1238         a->nla_len = nla_attr_size(len);
1239
1240         if (data)
1241                 memcpy(nla_data(a), data, len);
1242         memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
1243
1244         return 0;
1245 }
1246
1247 static inline int add_nested_action_start(struct sw_flow_actions **sfa,
1248                                           int attrtype)
1249 {
1250         int used = (*sfa)->actions_len;
1251         int err;
1252
1253         err = add_action(sfa, attrtype, NULL, 0);
1254         if (err)
1255                 return err;
1256
1257         return used;
1258 }
1259
1260 static inline void add_nested_action_end(struct sw_flow_actions *sfa,
1261                                          int st_offset)
1262 {
1263         struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
1264                                                                st_offset);
1265
1266         a->nla_len = sfa->actions_len - st_offset;
1267 }
1268
1269 static int validate_and_copy_sample(const struct nlattr *attr,
1270                                     const struct sw_flow_key *key, int depth,
1271                                     struct sw_flow_actions **sfa)
1272 {
1273         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
1274         const struct nlattr *probability, *actions;
1275         const struct nlattr *a;
1276         int rem, start, err, st_acts;
1277
1278         memset(attrs, 0, sizeof(attrs));
1279         nla_for_each_nested(a, attr, rem) {
1280                 int type = nla_type(a);
1281                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
1282                         return -EINVAL;
1283                 attrs[type] = a;
1284         }
1285         if (rem)
1286                 return -EINVAL;
1287
1288         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
1289         if (!probability || nla_len(probability) != sizeof(u32))
1290                 return -EINVAL;
1291
1292         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
1293         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
1294                 return -EINVAL;
1295
1296         /* validation done, copy sample action. */
1297         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE);
1298         if (start < 0)
1299                 return start;
1300         err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY,
1301                          nla_data(probability), sizeof(u32));
1302         if (err)
1303                 return err;
1304         st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
1305         if (st_acts < 0)
1306                 return st_acts;
1307
1308         err = ovs_nla_copy_actions(actions, key, depth + 1, sfa);
1309         if (err)
1310                 return err;
1311
1312         add_nested_action_end(*sfa, st_acts);
1313         add_nested_action_end(*sfa, start);
1314
1315         return 0;
1316 }
1317
1318 static int validate_tp_port(const struct sw_flow_key *flow_key)
1319 {
1320         if (flow_key->eth.type == htons(ETH_P_IP)) {
1321                 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
1322                         return 0;
1323         } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
1324                 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
1325                         return 0;
1326         }
1327
1328         return -EINVAL;
1329 }
1330
1331 void ovs_match_init(struct sw_flow_match *match,
1332                     struct sw_flow_key *key,
1333                     struct sw_flow_mask *mask)
1334 {
1335         memset(match, 0, sizeof(*match));
1336         match->key = key;
1337         match->mask = mask;
1338
1339         memset(key, 0, sizeof(*key));
1340
1341         if (mask) {
1342                 memset(&mask->key, 0, sizeof(mask->key));
1343                 mask->range.start = mask->range.end = 0;
1344         }
1345 }
1346
1347 static int validate_and_copy_set_tun(const struct nlattr *attr,
1348                                      struct sw_flow_actions **sfa)
1349 {
1350         struct sw_flow_match match;
1351         struct sw_flow_key key;
1352         int err, start;
1353
1354         ovs_match_init(&match, &key, NULL);
1355         err = ipv4_tun_from_nlattr(nla_data(attr), &match, false);
1356         if (err)
1357                 return err;
1358
1359         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
1360         if (start < 0)
1361                 return start;
1362
1363         err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &match.key->tun_key,
1364                         sizeof(match.key->tun_key));
1365         add_nested_action_end(*sfa, start);
1366
1367         return err;
1368 }
1369
1370 static int validate_set(const struct nlattr *a,
1371                         const struct sw_flow_key *flow_key,
1372                         struct sw_flow_actions **sfa,
1373                         bool *set_tun)
1374 {
1375         const struct nlattr *ovs_key = nla_data(a);
1376         int key_type = nla_type(ovs_key);
1377
1378         /* There can be only one key in a action */
1379         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
1380                 return -EINVAL;
1381
1382         if (key_type > OVS_KEY_ATTR_MAX ||
1383             (ovs_key_lens[key_type] != nla_len(ovs_key) &&
1384              ovs_key_lens[key_type] != -1))
1385                 return -EINVAL;
1386
1387         switch (key_type) {
1388         const struct ovs_key_ipv4 *ipv4_key;
1389         const struct ovs_key_ipv6 *ipv6_key;
1390         int err;
1391
1392         case OVS_KEY_ATTR_PRIORITY:
1393         case OVS_KEY_ATTR_SKB_MARK:
1394         case OVS_KEY_ATTR_ETHERNET:
1395                 break;
1396
1397         case OVS_KEY_ATTR_TUNNEL:
1398                 *set_tun = true;
1399                 err = validate_and_copy_set_tun(a, sfa);
1400                 if (err)
1401                         return err;
1402                 break;
1403
1404         case OVS_KEY_ATTR_IPV4:
1405                 if (flow_key->eth.type != htons(ETH_P_IP))
1406                         return -EINVAL;
1407
1408                 if (!flow_key->ip.proto)
1409                         return -EINVAL;
1410
1411                 ipv4_key = nla_data(ovs_key);
1412                 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
1413                         return -EINVAL;
1414
1415                 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
1416                         return -EINVAL;
1417
1418                 break;
1419
1420         case OVS_KEY_ATTR_IPV6:
1421                 if (flow_key->eth.type != htons(ETH_P_IPV6))
1422                         return -EINVAL;
1423
1424                 if (!flow_key->ip.proto)
1425                         return -EINVAL;
1426
1427                 ipv6_key = nla_data(ovs_key);
1428                 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
1429                         return -EINVAL;
1430
1431                 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
1432                         return -EINVAL;
1433
1434                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
1435                         return -EINVAL;
1436
1437                 break;
1438
1439         case OVS_KEY_ATTR_TCP:
1440                 if (flow_key->ip.proto != IPPROTO_TCP)
1441                         return -EINVAL;
1442
1443                 return validate_tp_port(flow_key);
1444
1445         case OVS_KEY_ATTR_UDP:
1446                 if (flow_key->ip.proto != IPPROTO_UDP)
1447                         return -EINVAL;
1448
1449                 return validate_tp_port(flow_key);
1450
1451         case OVS_KEY_ATTR_SCTP:
1452                 if (flow_key->ip.proto != IPPROTO_SCTP)
1453                         return -EINVAL;
1454
1455                 return validate_tp_port(flow_key);
1456
1457         default:
1458                 return -EINVAL;
1459         }
1460
1461         return 0;
1462 }
1463
1464 static int validate_userspace(const struct nlattr *attr)
1465 {
1466         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
1467                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
1468                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
1469         };
1470         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
1471         int error;
1472
1473         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
1474                                  attr, userspace_policy);
1475         if (error)
1476                 return error;
1477
1478         if (!a[OVS_USERSPACE_ATTR_PID] ||
1479             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
1480                 return -EINVAL;
1481
1482         return 0;
1483 }
1484
1485 static int copy_action(const struct nlattr *from,
1486                        struct sw_flow_actions **sfa)
1487 {
1488         int totlen = NLA_ALIGN(from->nla_len);
1489         struct nlattr *to;
1490
1491         to = reserve_sfa_size(sfa, from->nla_len);
1492         if (IS_ERR(to))
1493                 return PTR_ERR(to);
1494
1495         memcpy(to, from, totlen);
1496         return 0;
1497 }
1498
1499 int ovs_nla_copy_actions(const struct nlattr *attr,
1500                          const struct sw_flow_key *key,
1501                          int depth,
1502                          struct sw_flow_actions **sfa)
1503 {
1504         const struct nlattr *a;
1505         int rem, err;
1506
1507         if (depth >= SAMPLE_ACTION_DEPTH)
1508                 return -EOVERFLOW;
1509
1510         nla_for_each_nested(a, attr, rem) {
1511                 /* Expected argument lengths, (u32)-1 for variable length. */
1512                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
1513                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
1514                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
1515                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
1516                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
1517                         [OVS_ACTION_ATTR_SET] = (u32)-1,
1518                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
1519                 };
1520                 const struct ovs_action_push_vlan *vlan;
1521                 int type = nla_type(a);
1522                 bool skip_copy;
1523
1524                 if (type > OVS_ACTION_ATTR_MAX ||
1525                     (action_lens[type] != nla_len(a) &&
1526                      action_lens[type] != (u32)-1))
1527                         return -EINVAL;
1528
1529                 skip_copy = false;
1530                 switch (type) {
1531                 case OVS_ACTION_ATTR_UNSPEC:
1532                         return -EINVAL;
1533
1534                 case OVS_ACTION_ATTR_USERSPACE:
1535                         err = validate_userspace(a);
1536                         if (err)
1537                                 return err;
1538                         break;
1539
1540                 case OVS_ACTION_ATTR_OUTPUT:
1541                         if (nla_get_u32(a) >= DP_MAX_PORTS)
1542                                 return -EINVAL;
1543                         break;
1544
1545
1546                 case OVS_ACTION_ATTR_POP_VLAN:
1547                         break;
1548
1549                 case OVS_ACTION_ATTR_PUSH_VLAN:
1550                         vlan = nla_data(a);
1551                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
1552                                 return -EINVAL;
1553                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
1554                                 return -EINVAL;
1555                         break;
1556
1557                 case OVS_ACTION_ATTR_SET:
1558                         err = validate_set(a, key, sfa, &skip_copy);
1559                         if (err)
1560                                 return err;
1561                         break;
1562
1563                 case OVS_ACTION_ATTR_SAMPLE:
1564                         err = validate_and_copy_sample(a, key, depth, sfa);
1565                         if (err)
1566                                 return err;
1567                         skip_copy = true;
1568                         break;
1569
1570                 default:
1571                         return -EINVAL;
1572                 }
1573                 if (!skip_copy) {
1574                         err = copy_action(a, sfa);
1575                         if (err)
1576                                 return err;
1577                 }
1578         }
1579
1580         if (rem > 0)
1581                 return -EINVAL;
1582
1583         return 0;
1584 }
1585
1586 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
1587 {
1588         const struct nlattr *a;
1589         struct nlattr *start;
1590         int err = 0, rem;
1591
1592         start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
1593         if (!start)
1594                 return -EMSGSIZE;
1595
1596         nla_for_each_nested(a, attr, rem) {
1597                 int type = nla_type(a);
1598                 struct nlattr *st_sample;
1599
1600                 switch (type) {
1601                 case OVS_SAMPLE_ATTR_PROBABILITY:
1602                         if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY,
1603                                     sizeof(u32), nla_data(a)))
1604                                 return -EMSGSIZE;
1605                         break;
1606                 case OVS_SAMPLE_ATTR_ACTIONS:
1607                         st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
1608                         if (!st_sample)
1609                                 return -EMSGSIZE;
1610                         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
1611                         if (err)
1612                                 return err;
1613                         nla_nest_end(skb, st_sample);
1614                         break;
1615                 }
1616         }
1617
1618         nla_nest_end(skb, start);
1619         return err;
1620 }
1621
1622 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
1623 {
1624         const struct nlattr *ovs_key = nla_data(a);
1625         int key_type = nla_type(ovs_key);
1626         struct nlattr *start;
1627         int err;
1628
1629         switch (key_type) {
1630         case OVS_KEY_ATTR_IPV4_TUNNEL:
1631                 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
1632                 if (!start)
1633                         return -EMSGSIZE;
1634
1635                 err = ipv4_tun_to_nlattr(skb, nla_data(ovs_key),
1636                                              nla_data(ovs_key));
1637                 if (err)
1638                         return err;
1639                 nla_nest_end(skb, start);
1640                 break;
1641         default:
1642                 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
1643                         return -EMSGSIZE;
1644                 break;
1645         }
1646
1647         return 0;
1648 }
1649
1650 int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
1651 {
1652         const struct nlattr *a;
1653         int rem, err;
1654
1655         nla_for_each_attr(a, attr, len, rem) {
1656                 int type = nla_type(a);
1657
1658                 switch (type) {
1659                 case OVS_ACTION_ATTR_SET:
1660                         err = set_action_to_attr(a, skb);
1661                         if (err)
1662                                 return err;
1663                         break;
1664
1665                 case OVS_ACTION_ATTR_SAMPLE:
1666                         err = sample_action_to_attr(a, skb);
1667                         if (err)
1668                                 return err;
1669                         break;
1670                 default:
1671                         if (nla_put(skb, type, nla_len(a), nla_data(a)))
1672                                 return -EMSGSIZE;
1673                         break;
1674                 }
1675         }
1676
1677         return 0;
1678 }