datapath/flow_netlink.c

   1 /*
   2  * Copyright (c) 2007-2014 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 <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/geneve.h>
  44 #include <net/ip.h>
  45 #include <net/ipv6.h>
  46 #include <net/ndisc.h>
  47 #include <net/mpls.h>
  48
  49 #include "datapath.h"
  50 #include "flow.h"
  51 #include "flow_netlink.h"
  52 #include "vport-vxlan.h"
  53
  54 struct ovs_len_tbl {
  55         int len;
  56         const struct ovs_len_tbl *next;
  57 };
  58
  59 #define OVS_ATTR_NESTED -1
  60
  61 static void update_range(struct sw_flow_match *match,
  62                          size_t offset, size_t size, bool is_mask)
  63 {
  64         struct sw_flow_key_range *range;
  65         size_t start = rounddown(offset, sizeof(long));
  66         size_t end = roundup(offset + size, sizeof(long));
  67
  68         if (!is_mask)
  69                 range = &match->range;
  70         else
  71                 range = &match->mask->range;
  72
  73         if (range->start == range->end) {
  74                 range->start = start;
  75                 range->end = end;
  76                 return;
  77         }
  78
  79         if (range->start > start)
  80                 range->start = start;
  81
  82         if (range->end < end)
  83                 range->end = end;
  84 }
  85
  86 #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
  87         do { \
  88                 update_range(match, offsetof(struct sw_flow_key, field),    \
  89                              sizeof((match)->key->field), is_mask);         \
  90                 if (is_mask)                                                \
  91                         (match)->mask->key.field = value;                   \
  92                 else                                                        \
  93                         (match)->key->field = value;                        \
  94         } while (0)
  95
  96 #define SW_FLOW_KEY_MEMCPY_OFFSET(match, offset, value_p, len, is_mask)     \
  97         do {                                                                \
  98                 update_range(match, offset, len, is_mask);                  \
  99                 if (is_mask)                                                \
 100                         memcpy((u8 *)&(match)->mask->key + offset, value_p, len);\
 101                 else                                                        \
 102                         memcpy((u8 *)(match)->key + offset, value_p, len);  \
 103         } while (0)
 104
 105 #define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask)               \
 106         SW_FLOW_KEY_MEMCPY_OFFSET(match, offsetof(struct sw_flow_key, field), \
 107                                   value_p, len, is_mask)
 108
 109 #define SW_FLOW_KEY_MEMSET_FIELD(match, field, value, is_mask)              \
 110         do {                                                                \
 111                 update_range(match, offsetof(struct sw_flow_key, field),    \
 112                              sizeof((match)->key->field), is_mask);         \
 113                 if (is_mask)                                                \
 114                         memset((u8 *)&(match)->mask->key.field, value,      \
 115                                sizeof((match)->mask->key.field));           \
 116                 else                                                        \
 117                         memset((u8 *)&(match)->key->field, value,           \
 118                                sizeof((match)->key->field));                \
 119         } while (0)
 120
 121 static bool match_validate(const struct sw_flow_match *match,
 122                            u64 key_attrs, u64 mask_attrs, bool log)
 123 {
 124         u64 key_expected = 1ULL << OVS_KEY_ATTR_ETHERNET;
 125         u64 mask_allowed = key_attrs;  /* At most allow all key attributes */
 126
 127         /* The following mask attributes allowed only if they
 128          * pass the validation tests.
 129          */
 130         mask_allowed &= ~((1ULL << OVS_KEY_ATTR_IPV4)
 131                         | (1ULL << OVS_KEY_ATTR_IPV6)
 132                         | (1ULL << OVS_KEY_ATTR_TCP)
 133                         | (1ULL << OVS_KEY_ATTR_TCP_FLAGS)
 134                         | (1ULL << OVS_KEY_ATTR_UDP)
 135                         | (1ULL << OVS_KEY_ATTR_SCTP)
 136                         | (1ULL << OVS_KEY_ATTR_ICMP)
 137                         | (1ULL << OVS_KEY_ATTR_ICMPV6)
 138                         | (1ULL << OVS_KEY_ATTR_ARP)
 139                         | (1ULL << OVS_KEY_ATTR_ND)
 140                         | (1ULL << OVS_KEY_ATTR_MPLS));
 141
 142         /* Always allowed mask fields. */
 143         mask_allowed |= ((1ULL << OVS_KEY_ATTR_TUNNEL)
 144                        | (1ULL << OVS_KEY_ATTR_IN_PORT)
 145                        | (1ULL << OVS_KEY_ATTR_ETHERTYPE));
 146
 147         /* Check key attributes. */
 148         if (match->key->eth.type == htons(ETH_P_ARP)
 149                         || match->key->eth.type == htons(ETH_P_RARP)) {
 150                 key_expected |= 1ULL << OVS_KEY_ATTR_ARP;
 151                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 152                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ARP;
 153         }
 154
 155         if (eth_p_mpls(match->key->eth.type)) {
 156                 key_expected |= 1ULL << OVS_KEY_ATTR_MPLS;
 157                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 158                         mask_allowed |= 1ULL << OVS_KEY_ATTR_MPLS;
 159         }
 160
 161         if (match->key->eth.type == htons(ETH_P_IP)) {
 162                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV4;
 163                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 164                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV4;
 165
 166                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 167                         if (match->key->ip.proto == IPPROTO_UDP) {
 168                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 169                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 170                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 171                         }
 172
 173                         if (match->key->ip.proto == IPPROTO_SCTP) {
 174                                 key_expected |= 1ULL << OVS_KEY_ATTR_SCTP;
 175                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 176                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_SCTP;
 177                         }
 178
 179                         if (match->key->ip.proto == IPPROTO_TCP) {
 180                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 181                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 182                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 183                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 184                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 185                                 }
 186                         }
 187
 188                         if (match->key->ip.proto == IPPROTO_ICMP) {
 189                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMP;
 190                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 191                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMP;
 192                         }
 193                 }
 194         }
 195
 196         if (match->key->eth.type == htons(ETH_P_IPV6)) {
 197                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV6;
 198                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 199                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV6;
 200
 201                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 202                         if (match->key->ip.proto == IPPROTO_UDP) {
 203                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 204                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 205                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 206                         }
 207
 208                         if (match->key->ip.proto == IPPROTO_SCTP) {
 209                                 key_expected |= 1ULL << OVS_KEY_ATTR_SCTP;
 210                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 211                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_SCTP;
 212                         }
 213
 214                         if (match->key->ip.proto == IPPROTO_TCP) {
 215                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 216                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 217                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 218                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 219                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 220                                 }
 221                         }
 222
 223                         if (match->key->ip.proto == IPPROTO_ICMPV6) {
 224                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 225                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 226                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 227
 228                                 if (match->key->tp.src ==
 229                                                 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 230                                     match->key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 231                                         key_expected |= 1ULL << OVS_KEY_ATTR_ND;
 232                                         if (match->mask && (match->mask->key.tp.src == htons(0xff)))
 233                                                 mask_allowed |= 1ULL << OVS_KEY_ATTR_ND;
 234                                 }
 235                         }
 236                 }
 237         }
 238
 239         if ((key_attrs & key_expected) != key_expected) {
 240                 /* Key attributes check failed. */
 241                 OVS_NLERR(log, "Missing key (keys=%llx, expected=%llx)",
 242                           (unsigned long long)key_attrs,
 243                           (unsigned long long)key_expected);
 244                 return false;
 245         }
 246
 247         if ((mask_attrs & mask_allowed) != mask_attrs) {
 248                 /* Mask attributes check failed. */
 249                 OVS_NLERR(log, "Unexpected mask (mask=%llx, allowed=%llx)",
 250                           (unsigned long long)mask_attrs,
 251                           (unsigned long long)mask_allowed);
 252                 return false;
 253         }
 254
 255         return true;
 256 }
 257
 258 size_t ovs_tun_key_attr_size(void)
 259 {
 260         /* Whenever adding new OVS_TUNNEL_KEY_ FIELDS, we should consider
 261          * updating this function.
 262          */
 263         return    nla_total_size(8)    /* OVS_TUNNEL_KEY_ATTR_ID */
 264                 + nla_total_size(4)    /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
 265                 + nla_total_size(4)    /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
 266                 + nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TOS */
 267                 + nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TTL */
 268                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
 269                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_CSUM */
 270                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_OAM */
 271                 + nla_total_size(256)  /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */
 272                 /* OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS is mutually exclusive with
 273                  * OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS and covered by it.
 274                  */
 275                 + nla_total_size(2)    /* OVS_TUNNEL_KEY_ATTR_TP_SRC */
 276                 + nla_total_size(2);   /* OVS_TUNNEL_KEY_ATTR_TP_DST */
 277 }
 278
 279 size_t ovs_key_attr_size(void)
 280 {
 281         /* Whenever adding new OVS_KEY_ FIELDS, we should consider
 282          * updating this function.
 283          */
 284         BUILD_BUG_ON(OVS_KEY_ATTR_TUNNEL_INFO != 22);
 285
 286         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
 287                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
 288                   + ovs_tun_key_attr_size()
 289                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
 290                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
 291                 + nla_total_size(4)   /* OVS_KEY_ATTR_DP_HASH */
 292                 + nla_total_size(4)   /* OVS_KEY_ATTR_RECIRC_ID */
 293                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
 294                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 295                 + nla_total_size(4)   /* OVS_KEY_ATTR_VLAN */
 296                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
 297                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 298                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
 299                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
 300                 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
 301 }
 302
 303 static const struct ovs_len_tbl ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
 304         [OVS_TUNNEL_KEY_ATTR_ID]            = { .len = sizeof(u64) },
 305         [OVS_TUNNEL_KEY_ATTR_IPV4_SRC]      = { .len = sizeof(u32) },
 306         [OVS_TUNNEL_KEY_ATTR_IPV4_DST]      = { .len = sizeof(u32) },
 307         [OVS_TUNNEL_KEY_ATTR_TOS]           = { .len = 1 },
 308         [OVS_TUNNEL_KEY_ATTR_TTL]           = { .len = 1 },
 309         [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = { .len = 0 },
 310         [OVS_TUNNEL_KEY_ATTR_CSUM]          = { .len = 0 },
 311         [OVS_TUNNEL_KEY_ATTR_TP_SRC]        = { .len = sizeof(u16) },
 312         [OVS_TUNNEL_KEY_ATTR_TP_DST]        = { .len = sizeof(u16) },
 313         [OVS_TUNNEL_KEY_ATTR_OAM]           = { .len = 0 },
 314         [OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS]   = { .len = OVS_ATTR_NESTED },
 315         [OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS]    = { .len = OVS_ATTR_NESTED },
 316 };
 317
 318 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
 319 static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
 320         [OVS_KEY_ATTR_ENCAP]     = { .len = OVS_ATTR_NESTED },
 321         [OVS_KEY_ATTR_PRIORITY]  = { .len = sizeof(u32) },
 322         [OVS_KEY_ATTR_IN_PORT]   = { .len = sizeof(u32) },
 323         [OVS_KEY_ATTR_SKB_MARK]  = { .len = sizeof(u32) },
 324         [OVS_KEY_ATTR_ETHERNET]  = { .len = sizeof(struct ovs_key_ethernet) },
 325         [OVS_KEY_ATTR_VLAN]      = { .len = sizeof(__be16) },
 326         [OVS_KEY_ATTR_ETHERTYPE] = { .len = sizeof(__be16) },
 327         [OVS_KEY_ATTR_IPV4]      = { .len = sizeof(struct ovs_key_ipv4) },
 328         [OVS_KEY_ATTR_IPV6]      = { .len = sizeof(struct ovs_key_ipv6) },
 329         [OVS_KEY_ATTR_TCP]       = { .len = sizeof(struct ovs_key_tcp) },
 330         [OVS_KEY_ATTR_TCP_FLAGS] = { .len = sizeof(__be16) },
 331         [OVS_KEY_ATTR_UDP]       = { .len = sizeof(struct ovs_key_udp) },
 332         [OVS_KEY_ATTR_SCTP]      = { .len = sizeof(struct ovs_key_sctp) },
 333         [OVS_KEY_ATTR_ICMP]      = { .len = sizeof(struct ovs_key_icmp) },
 334         [OVS_KEY_ATTR_ICMPV6]    = { .len = sizeof(struct ovs_key_icmpv6) },
 335         [OVS_KEY_ATTR_ARP]       = { .len = sizeof(struct ovs_key_arp) },
 336         [OVS_KEY_ATTR_ND]        = { .len = sizeof(struct ovs_key_nd) },
 337         [OVS_KEY_ATTR_RECIRC_ID] = { .len = sizeof(u32) },
 338         [OVS_KEY_ATTR_DP_HASH]   = { .len = sizeof(u32) },
 339         [OVS_KEY_ATTR_TUNNEL]    = { .len = OVS_ATTR_NESTED,
 340                                      .next = ovs_tunnel_key_lens, },
 341         [OVS_KEY_ATTR_MPLS]      = { .len = sizeof(struct ovs_key_mpls) },
 342 };
 343 static bool is_all_zero(const u8 *fp, size_t size)
 344 {
 345         int i;
 346
 347         if (!fp)
 348                 return false;
 349
 350         for (i = 0; i < size; i++)
 351                 if (fp[i])
 352                         return false;
 353
 354         return true;
 355 }
 356
 357 static int __parse_flow_nlattrs(const struct nlattr *attr,
 358                                 const struct nlattr *a[],
 359                                 u64 *attrsp, bool log, bool nz)
 360 {
 361         const struct nlattr *nla;
 362         u64 attrs;
 363         int rem;
 364
 365         attrs = *attrsp;
 366         nla_for_each_nested(nla, attr, rem) {
 367                 u16 type = nla_type(nla);
 368                 int expected_len;
 369
 370                 if (type > OVS_KEY_ATTR_MAX) {
 371                         OVS_NLERR(log, "Key type %d is out of range max %d",
 372                                   type, OVS_KEY_ATTR_MAX);
 373                         return -EINVAL;
 374                 }
 375
 376                 if (attrs & (1ULL << type)) {
 377                         OVS_NLERR(log, "Duplicate key (type %d).", type);
 378                         return -EINVAL;
 379                 }
 380
 381                 expected_len = ovs_key_lens[type].len;
 382                 if (nla_len(nla) != expected_len && expected_len != OVS_ATTR_NESTED) {
 383                         OVS_NLERR(log, "Key %d has unexpected len %d expected %d",
 384                                   type, nla_len(nla), expected_len);
 385                         return -EINVAL;
 386                 }
 387
 388                 if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
 389                         attrs |= 1ULL << type;
 390                         a[type] = nla;
 391                 }
 392         }
 393         if (rem) {
 394                 OVS_NLERR(log, "Message has %d unknown bytes.", rem);
 395                 return -EINVAL;
 396         }
 397
 398         *attrsp = attrs;
 399         return 0;
 400 }
 401
 402 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
 403                                    const struct nlattr *a[], u64 *attrsp,
 404                                    bool log)
 405 {
 406         return __parse_flow_nlattrs(attr, a, attrsp, log, true);
 407 }
 408
 409 static int parse_flow_nlattrs(const struct nlattr *attr,
 410                               const struct nlattr *a[], u64 *attrsp,
 411                               bool log)
 412 {
 413         return __parse_flow_nlattrs(attr, a, attrsp, log, false);
 414 }
 415
 416 static int genev_tun_opt_from_nlattr(const struct nlattr *a,
 417                                      struct sw_flow_match *match, bool is_mask,
 418                                      bool log)
 419 {
 420         unsigned long opt_key_offset;
 421
 422         if (nla_len(a) > sizeof(match->key->tun_opts)) {
 423                 OVS_NLERR(log, "Geneve option length err (len %d, max %zu).",
 424                           nla_len(a), sizeof(match->key->tun_opts));
 425                 return -EINVAL;
 426         }
 427
 428         if (nla_len(a) % 4 != 0) {
 429                 OVS_NLERR(log, "Geneve opt len %d is not a multiple of 4.",
 430                           nla_len(a));
 431                 return -EINVAL;
 432         }
 433
 434         /* We need to record the length of the options passed
 435          * down, otherwise packets with the same format but
 436          * additional options will be silently matched.
 437          */
 438         if (!is_mask) {
 439                 SW_FLOW_KEY_PUT(match, tun_opts_len, nla_len(a),
 440                                 false);
 441         } else {
 442                 /* This is somewhat unusual because it looks at
 443                  * both the key and mask while parsing the
 444                  * attributes (and by extension assumes the key
 445                  * is parsed first). Normally, we would verify
 446                  * that each is the correct length and that the
 447                  * attributes line up in the validate function.
 448                  * However, that is difficult because this is
 449                  * variable length and we won't have the
 450                  * information later.
 451                  */
 452                 if (match->key->tun_opts_len != nla_len(a)) {
 453                         OVS_NLERR(log, "Geneve option len %d != mask len %d",
 454                                   match->key->tun_opts_len, nla_len(a));
 455                         return -EINVAL;
 456                 }
 457
 458                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
 459         }
 460
 461         opt_key_offset = TUN_METADATA_OFFSET(nla_len(a));
 462         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a),
 463                                   nla_len(a), is_mask);
 464         return 0;
 465 }
 466
 467 static const struct nla_policy vxlan_opt_policy[OVS_VXLAN_EXT_MAX + 1] = {
 468         [OVS_VXLAN_EXT_GBP]     = { .type = NLA_U32 },
 469 };
 470
 471 static int vxlan_tun_opt_from_nlattr(const struct nlattr *a,
 472                                      struct sw_flow_match *match, bool is_mask,
 473                                      bool log)
 474 {
 475         struct nlattr *tb[OVS_VXLAN_EXT_MAX+1];
 476         unsigned long opt_key_offset;
 477         struct ovs_vxlan_opts opts;
 478         int err;
 479
 480         BUILD_BUG_ON(sizeof(opts) > sizeof(match->key->tun_opts));
 481
 482         err = nla_parse_nested(tb, OVS_VXLAN_EXT_MAX, a, vxlan_opt_policy);
 483         if (err < 0)
 484                 return err;
 485
 486         memset(&opts, 0, sizeof(opts));
 487
 488         if (tb[OVS_VXLAN_EXT_GBP])
 489                 opts.gbp = nla_get_u32(tb[OVS_VXLAN_EXT_GBP]);
 490
 491         if (!is_mask)
 492                 SW_FLOW_KEY_PUT(match, tun_opts_len, sizeof(opts), false);
 493         else
 494                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
 495
 496         opt_key_offset = TUN_METADATA_OFFSET(sizeof(opts));
 497         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, &opts, sizeof(opts),
 498                                   is_mask);
 499         return 0;
 500 }
 501
 502 static int ipv4_tun_from_nlattr(const struct nlattr *attr,
 503                                 struct sw_flow_match *match, bool is_mask,
 504                                 bool log)
 505 {
 506         struct nlattr *a;
 507         int rem;
 508         bool ttl = false;
 509         __be16 tun_flags = 0;
 510         int opts_type = 0;
 511
 512         nla_for_each_nested(a, attr, rem) {
 513                 int type = nla_type(a);
 514                 int err;
 515
 516                 if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
 517                         OVS_NLERR(log, "Tunnel attr %d out of range max %d",
 518                                   type, OVS_TUNNEL_KEY_ATTR_MAX);
 519                         return -EINVAL;
 520                 }
 521
 522                 if (ovs_tunnel_key_lens[type].len != nla_len(a) &&
 523                    ovs_tunnel_key_lens[type].len != OVS_ATTR_NESTED) {
 524                         OVS_NLERR(log, "Tunnel attr %d has unexpected len %d expected %d",
 525                                   type, nla_len(a), ovs_tunnel_key_lens[type].len);
 526                         return -EINVAL;
 527                 }
 528
 529                 switch (type) {
 530                 case OVS_TUNNEL_KEY_ATTR_ID:
 531                         SW_FLOW_KEY_PUT(match, tun_key.tun_id,
 532                                         nla_get_be64(a), is_mask);
 533                         tun_flags |= TUNNEL_KEY;
 534                         break;
 535                 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
 536                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_src,
 537                                         nla_get_be32(a), is_mask);
 538                         break;
 539                 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
 540                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst,
 541                                         nla_get_be32(a), is_mask);
 542                         break;
 543                 case OVS_TUNNEL_KEY_ATTR_TOS:
 544                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos,
 545                                         nla_get_u8(a), is_mask);
 546                         break;
 547                 case OVS_TUNNEL_KEY_ATTR_TTL:
 548                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_ttl,
 549                                         nla_get_u8(a), is_mask);
 550                         ttl = true;
 551                         break;
 552                 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
 553                         tun_flags |= TUNNEL_DONT_FRAGMENT;
 554                         break;
 555                 case OVS_TUNNEL_KEY_ATTR_CSUM:
 556                         tun_flags |= TUNNEL_CSUM;
 557                         break;
 558                 case OVS_TUNNEL_KEY_ATTR_TP_SRC:
 559                         SW_FLOW_KEY_PUT(match, tun_key.tp_src,
 560                                         nla_get_be16(a), is_mask);
 561                         break;
 562                 case OVS_TUNNEL_KEY_ATTR_TP_DST:
 563                         SW_FLOW_KEY_PUT(match, tun_key.tp_dst,
 564                                         nla_get_be16(a), is_mask);
 565                         break;
 566                 case OVS_TUNNEL_KEY_ATTR_OAM:
 567                         tun_flags |= TUNNEL_OAM;
 568                         break;
 569                 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
 570                         if (opts_type) {
 571                                 OVS_NLERR(log, "Multiple metadata blocks provided");
 572                                 return -EINVAL;
 573                         }
 574
 575                         err = genev_tun_opt_from_nlattr(a, match, is_mask, log);
 576                         if (err)
 577                                 return err;
 578
 579                         tun_flags |= TUNNEL_GENEVE_OPT;
 580                         opts_type = type;
 581                         break;
 582                 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
 583                         if (opts_type) {
 584                                 OVS_NLERR(log, "Multiple metadata blocks provided");
 585                                 return -EINVAL;
 586                         }
 587
 588                         err = vxlan_tun_opt_from_nlattr(a, match, is_mask, log);
 589                         if (err)
 590                                 return err;
 591
 592                         tun_flags |= TUNNEL_VXLAN_OPT;
 593                         opts_type = type;
 594                         break;
 595                 default:
 596                         OVS_NLERR(log, "Unknown IPv4 tunnel attribute %d",
 597                                   type);
 598                         return -EINVAL;
 599                 }
 600         }
 601
 602         SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
 603
 604         if (rem > 0) {
 605                 OVS_NLERR(log, "IPv4 tunnel attribute has %d unknown bytes.",
 606                           rem);
 607                 return -EINVAL;
 608         }
 609
 610         if (!is_mask) {
 611                 if (!match->key->tun_key.ipv4_dst) {
 612                         OVS_NLERR(log, "IPv4 tunnel dst address is zero");
 613                         return -EINVAL;
 614                 }
 615
 616                 if (!ttl) {
 617                         OVS_NLERR(log, "IPv4 tunnel TTL not specified.");
 618                         return -EINVAL;
 619                 }
 620         }
 621
 622         return opts_type;
 623 }
 624
 625 static int vxlan_opt_to_nlattr(struct sk_buff *skb,
 626                                const void *tun_opts, int swkey_tun_opts_len)
 627 {
 628         const struct ovs_vxlan_opts *opts = tun_opts;
 629         struct nlattr *nla;
 630
 631         nla = nla_nest_start(skb, OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS);
 632         if (!nla)
 633                 return -EMSGSIZE;
 634
 635         if (nla_put_u32(skb, OVS_VXLAN_EXT_GBP, opts->gbp) < 0)
 636                 return -EMSGSIZE;
 637
 638         nla_nest_end(skb, nla);
 639         return 0;
 640 }
 641
 642 static int __ipv4_tun_to_nlattr(struct sk_buff *skb,
 643                                 const struct ovs_key_ipv4_tunnel *output,
 644                                 const void *tun_opts, int swkey_tun_opts_len)
 645 {
 646         if (output->tun_flags & TUNNEL_KEY &&
 647             nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id))
 648                 return -EMSGSIZE;
 649         if (output->ipv4_src &&
 650             nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src))
 651                 return -EMSGSIZE;
 652         if (output->ipv4_dst &&
 653             nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst))
 654                 return -EMSGSIZE;
 655         if (output->ipv4_tos &&
 656             nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->ipv4_tos))
 657                 return -EMSGSIZE;
 658         if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl))
 659                 return -EMSGSIZE;
 660         if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
 661             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
 662                 return -EMSGSIZE;
 663         if ((output->tun_flags & TUNNEL_CSUM) &&
 664             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
 665                 return -EMSGSIZE;
 666         if (output->tp_src &&
 667             nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_SRC, output->tp_src))
 668                 return -EMSGSIZE;
 669         if (output->tp_dst &&
 670             nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_DST, output->tp_dst))
 671                 return -EMSGSIZE;
 672         if ((output->tun_flags & TUNNEL_OAM) &&
 673             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_OAM))
 674                 return -EMSGSIZE;
 675         if (tun_opts) {
 676                 if (output->tun_flags & TUNNEL_GENEVE_OPT &&
 677                     nla_put(skb, OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS,
 678                             swkey_tun_opts_len, tun_opts))
 679                         return -EMSGSIZE;
 680                else if (output->tun_flags & TUNNEL_VXLAN_OPT &&
 681                         vxlan_opt_to_nlattr(skb, tun_opts, swkey_tun_opts_len))
 682                         return -EMSGSIZE;
 683         }
 684
 685         return 0;
 686 }
 687
 688 static int ipv4_tun_to_nlattr(struct sk_buff *skb,
 689                               const struct ovs_key_ipv4_tunnel *output,
 690                               const void *tun_opts, int swkey_tun_opts_len)
 691 {
 692         struct nlattr *nla;
 693         int err;
 694
 695         nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
 696         if (!nla)
 697                 return -EMSGSIZE;
 698
 699         err = __ipv4_tun_to_nlattr(skb, output, tun_opts, swkey_tun_opts_len);
 700         if (err)
 701                 return err;
 702
 703         nla_nest_end(skb, nla);
 704         return 0;
 705 }
 706
 707 int ovs_nla_put_egress_tunnel_key(struct sk_buff *skb,
 708                                   const struct ovs_tunnel_info *egress_tun_info)
 709 {
 710         return __ipv4_tun_to_nlattr(skb, &egress_tun_info->tunnel,
 711                                     egress_tun_info->options,
 712                                     egress_tun_info->options_len);
 713 }
 714
 715 static int metadata_from_nlattrs(struct sw_flow_match *match,  u64 *attrs,
 716                                  const struct nlattr **a, bool is_mask,
 717                                  bool log)
 718 {
 719         if (*attrs & (1ULL << OVS_KEY_ATTR_DP_HASH)) {
 720                 u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]);
 721
 722                 SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask);
 723                 *attrs &= ~(1ULL << OVS_KEY_ATTR_DP_HASH);
 724         }
 725
 726         if (*attrs & (1ULL << OVS_KEY_ATTR_RECIRC_ID)) {
 727                 u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]);
 728
 729                 SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask);
 730                 *attrs &= ~(1ULL << OVS_KEY_ATTR_RECIRC_ID);
 731         }
 732
 733         if (*attrs & (1ULL << OVS_KEY_ATTR_PRIORITY)) {
 734                 SW_FLOW_KEY_PUT(match, phy.priority,
 735                           nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
 736                 *attrs &= ~(1ULL << OVS_KEY_ATTR_PRIORITY);
 737         }
 738
 739         if (*attrs & (1ULL << OVS_KEY_ATTR_IN_PORT)) {
 740                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
 741
 742                 if (is_mask) {
 743                         in_port = 0xffffffff; /* Always exact match in_port. */
 744                 } else if (in_port >= DP_MAX_PORTS) {
 745                         OVS_NLERR(log, "Port %d exceeds max allowable %d",
 746                                   in_port, DP_MAX_PORTS);
 747                         return -EINVAL;
 748                 }
 749
 750                 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
 751                 *attrs &= ~(1ULL << OVS_KEY_ATTR_IN_PORT);
 752         } else if (!is_mask) {
 753                 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
 754         }
 755
 756         if (*attrs & (1ULL << OVS_KEY_ATTR_SKB_MARK)) {
 757                 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
 758
 759                 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
 760                 *attrs &= ~(1ULL << OVS_KEY_ATTR_SKB_MARK);
 761         }
 762         if (*attrs & (1ULL << OVS_KEY_ATTR_TUNNEL)) {
 763                 if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
 764                                          is_mask, log) < 0)
 765                         return -EINVAL;
 766                 *attrs &= ~(1ULL << OVS_KEY_ATTR_TUNNEL);
 767         }
 768         return 0;
 769 }
 770
 771 static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
 772                                 const struct nlattr **a, bool is_mask,
 773                                 bool log)
 774 {
 775         int err;
 776
 777         err = metadata_from_nlattrs(match, &attrs, a, is_mask, log);
 778         if (err)
 779                 return err;
 780
 781         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) {
 782                 const struct ovs_key_ethernet *eth_key;
 783
 784                 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
 785                 SW_FLOW_KEY_MEMCPY(match, eth.src,
 786                                 eth_key->eth_src, ETH_ALEN, is_mask);
 787                 SW_FLOW_KEY_MEMCPY(match, eth.dst,
 788                                 eth_key->eth_dst, ETH_ALEN, is_mask);
 789                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERNET);
 790         }
 791
 792         if (attrs & (1ULL << OVS_KEY_ATTR_VLAN)) {
 793                 __be16 tci;
 794
 795                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 796                 if (!(tci & htons(VLAN_TAG_PRESENT))) {
 797                         if (is_mask)
 798                                 OVS_NLERR(log, "VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.");
 799                         else
 800                                 OVS_NLERR(log, "VLAN TCI does not have VLAN_TAG_PRESENT bit set.");
 801
 802                         return -EINVAL;
 803                 }
 804
 805                 SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
 806                 attrs &= ~(1ULL << OVS_KEY_ATTR_VLAN);
 807         }
 808
 809         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) {
 810                 __be16 eth_type;
 811
 812                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 813                 if (is_mask) {
 814                         /* Always exact match EtherType. */
 815                         eth_type = htons(0xffff);
 816                 } else if (ntohs(eth_type) < ETH_P_802_3_MIN) {
 817                         OVS_NLERR(log, "EtherType %x is less than min %x",
 818                                   ntohs(eth_type), ETH_P_802_3_MIN);
 819                         return -EINVAL;
 820                 }
 821
 822                 SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
 823                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 824         } else if (!is_mask) {
 825                 SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
 826         }
 827
 828         if (attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 829                 const struct ovs_key_ipv4 *ipv4_key;
 830
 831                 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
 832                 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
 833                         OVS_NLERR(log, "IPv4 frag type %d is out of range max %d",
 834                                   ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
 835                         return -EINVAL;
 836                 }
 837                 SW_FLOW_KEY_PUT(match, ip.proto,
 838                                 ipv4_key->ipv4_proto, is_mask);
 839                 SW_FLOW_KEY_PUT(match, ip.tos,
 840                                 ipv4_key->ipv4_tos, is_mask);
 841                 SW_FLOW_KEY_PUT(match, ip.ttl,
 842                                 ipv4_key->ipv4_ttl, is_mask);
 843                 SW_FLOW_KEY_PUT(match, ip.frag,
 844                                 ipv4_key->ipv4_frag, is_mask);
 845                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 846                                 ipv4_key->ipv4_src, is_mask);
 847                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 848                                 ipv4_key->ipv4_dst, is_mask);
 849                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV4);
 850         }
 851
 852         if (attrs & (1ULL << OVS_KEY_ATTR_IPV6)) {
 853                 const struct ovs_key_ipv6 *ipv6_key;
 854
 855                 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
 856                 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
 857                         OVS_NLERR(log, "IPv6 frag type %d is out of range max %d",
 858                                   ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
 859                         return -EINVAL;
 860                 }
 861                 if (!is_mask && ipv6_key->ipv6_label & htonl(0xFFF00000)) {
 862                         OVS_NLERR(log,
 863                                   "Invalid IPv6 flow label value (value=%x, max=%x).",
 864                                   ntohl(ipv6_key->ipv6_label), (1 << 20) - 1);
 865                         return -EINVAL;
 866                 }
 867                 SW_FLOW_KEY_PUT(match, ipv6.label,
 868                                 ipv6_key->ipv6_label, is_mask);
 869                 SW_FLOW_KEY_PUT(match, ip.proto,
 870                                 ipv6_key->ipv6_proto, is_mask);
 871                 SW_FLOW_KEY_PUT(match, ip.tos,
 872                                 ipv6_key->ipv6_tclass, is_mask);
 873                 SW_FLOW_KEY_PUT(match, ip.ttl,
 874                                 ipv6_key->ipv6_hlimit, is_mask);
 875                 SW_FLOW_KEY_PUT(match, ip.frag,
 876                                 ipv6_key->ipv6_frag, is_mask);
 877                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
 878                                 ipv6_key->ipv6_src,
 879                                 sizeof(match->key->ipv6.addr.src),
 880                                 is_mask);
 881                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
 882                                 ipv6_key->ipv6_dst,
 883                                 sizeof(match->key->ipv6.addr.dst),
 884                                 is_mask);
 885
 886                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV6);
 887         }
 888
 889         if (attrs & (1ULL << OVS_KEY_ATTR_ARP)) {
 890                 const struct ovs_key_arp *arp_key;
 891
 892                 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
 893                 if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
 894                         OVS_NLERR(log, "Unknown ARP opcode (opcode=%d).",
 895                                   arp_key->arp_op);
 896                         return -EINVAL;
 897                 }
 898
 899                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 900                                 arp_key->arp_sip, is_mask);
 901                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 902                         arp_key->arp_tip, is_mask);
 903                 SW_FLOW_KEY_PUT(match, ip.proto,
 904                                 ntohs(arp_key->arp_op), is_mask);
 905                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
 906                                 arp_key->arp_sha, ETH_ALEN, is_mask);
 907                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
 908                                 arp_key->arp_tha, ETH_ALEN, is_mask);
 909
 910                 attrs &= ~(1ULL << OVS_KEY_ATTR_ARP);
 911         }
 912
 913         if (attrs & (1ULL << OVS_KEY_ATTR_MPLS)) {
 914                 const struct ovs_key_mpls *mpls_key;
 915
 916                 mpls_key = nla_data(a[OVS_KEY_ATTR_MPLS]);
 917                 SW_FLOW_KEY_PUT(match, mpls.top_lse,
 918                                 mpls_key->mpls_lse, is_mask);
 919
 920                 attrs &= ~(1ULL << OVS_KEY_ATTR_MPLS);
 921         }
 922
 923         if (attrs & (1ULL << OVS_KEY_ATTR_TCP)) {
 924                 const struct ovs_key_tcp *tcp_key;
 925
 926                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
 927                 SW_FLOW_KEY_PUT(match, tp.src, tcp_key->tcp_src, is_mask);
 928                 SW_FLOW_KEY_PUT(match, tp.dst, tcp_key->tcp_dst, is_mask);
 929                 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP);
 930         }
 931
 932         if (attrs & (1ULL << OVS_KEY_ATTR_TCP_FLAGS)) {
 933                 SW_FLOW_KEY_PUT(match, tp.flags,
 934                                 nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
 935                                 is_mask);
 936                 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP_FLAGS);
 937         }
 938
 939         if (attrs & (1ULL << OVS_KEY_ATTR_UDP)) {
 940                 const struct ovs_key_udp *udp_key;
 941
 942                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
 943                 SW_FLOW_KEY_PUT(match, tp.src, udp_key->udp_src, is_mask);
 944                 SW_FLOW_KEY_PUT(match, tp.dst, udp_key->udp_dst, is_mask);
 945                 attrs &= ~(1ULL << OVS_KEY_ATTR_UDP);
 946         }
 947
 948         if (attrs & (1ULL << OVS_KEY_ATTR_SCTP)) {
 949                 const struct ovs_key_sctp *sctp_key;
 950
 951                 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
 952                 SW_FLOW_KEY_PUT(match, tp.src, sctp_key->sctp_src, is_mask);
 953                 SW_FLOW_KEY_PUT(match, tp.dst, sctp_key->sctp_dst, is_mask);
 954                 attrs &= ~(1ULL << OVS_KEY_ATTR_SCTP);
 955         }
 956
 957         if (attrs & (1ULL << OVS_KEY_ATTR_ICMP)) {
 958                 const struct ovs_key_icmp *icmp_key;
 959
 960                 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
 961                 SW_FLOW_KEY_PUT(match, tp.src,
 962                                 htons(icmp_key->icmp_type), is_mask);
 963                 SW_FLOW_KEY_PUT(match, tp.dst,
 964                                 htons(icmp_key->icmp_code), is_mask);
 965                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMP);
 966         }
 967
 968         if (attrs & (1ULL << OVS_KEY_ATTR_ICMPV6)) {
 969                 const struct ovs_key_icmpv6 *icmpv6_key;
 970
 971                 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
 972                 SW_FLOW_KEY_PUT(match, tp.src,
 973                                 htons(icmpv6_key->icmpv6_type), is_mask);
 974                 SW_FLOW_KEY_PUT(match, tp.dst,
 975                                 htons(icmpv6_key->icmpv6_code), is_mask);
 976                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMPV6);
 977         }
 978
 979         if (attrs & (1ULL << OVS_KEY_ATTR_ND)) {
 980                 const struct ovs_key_nd *nd_key;
 981
 982                 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
 983                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
 984                         nd_key->nd_target,
 985                         sizeof(match->key->ipv6.nd.target),
 986                         is_mask);
 987                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
 988                         nd_key->nd_sll, ETH_ALEN, is_mask);
 989                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
 990                                 nd_key->nd_tll, ETH_ALEN, is_mask);
 991                 attrs &= ~(1ULL << OVS_KEY_ATTR_ND);
 992         }
 993
 994         if (attrs != 0) {
 995                 OVS_NLERR(log, "Unknown key attributes %llx",
 996                           (unsigned long long)attrs);
 997                 return -EINVAL;
 998         }
 999
1000         return 0;
1001 }
1002
1003 static void nlattr_set(struct nlattr *attr, u8 val,
1004                        const struct ovs_len_tbl *tbl)
1005 {
1006         struct nlattr *nla;
1007         int rem;
1008
1009         /* The nlattr stream should already have been validated */
1010         nla_for_each_nested(nla, attr, rem) {
1011                 if (tbl && tbl[nla_type(nla)].len == OVS_ATTR_NESTED)
1012                         nlattr_set(nla, val, tbl[nla_type(nla)].next);
1013                 else
1014                         memset(nla_data(nla), val, nla_len(nla));
1015         }
1016 }
1017
1018 static void mask_set_nlattr(struct nlattr *attr, u8 val)
1019 {
1020         nlattr_set(attr, val, ovs_key_lens);
1021 }
1022
1023 /**
1024  * ovs_nla_get_match - parses Netlink attributes into a flow key and
1025  * mask. In case the 'mask' is NULL, the flow is treated as exact match
1026  * flow. Otherwise, it is treated as a wildcarded flow, except the mask
1027  * does not include any don't care bit.
1028  * @match: receives the extracted flow match information.
1029  * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1030  * sequence. The fields should of the packet that triggered the creation
1031  * of this flow.
1032  * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
1033  * attribute specifies the mask field of the wildcarded flow.
1034  * @log: Boolean to allow kernel error logging.  Normally true, but when
1035  * probing for feature compatibility this should be passed in as false to
1036  * suppress unnecessary error logging.
1037  */
1038 int ovs_nla_get_match(struct sw_flow_match *match,
1039                       const struct nlattr *nla_key,
1040                       const struct nlattr *nla_mask,
1041                       bool log)
1042 {
1043         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1044         const struct nlattr *encap;
1045         struct nlattr *newmask = NULL;
1046         u64 key_attrs = 0;
1047         u64 mask_attrs = 0;
1048         bool encap_valid = false;
1049         int err;
1050
1051         err = parse_flow_nlattrs(nla_key, a, &key_attrs, log);
1052         if (err)
1053                 return err;
1054
1055         if ((key_attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) &&
1056             (key_attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) &&
1057             (nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
1058                 __be16 tci;
1059
1060                 if (!((key_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) &&
1061                       (key_attrs & (1ULL << OVS_KEY_ATTR_ENCAP)))) {
1062                         OVS_NLERR(log, "Invalid Vlan frame.");
1063                         return -EINVAL;
1064                 }
1065
1066                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
1067                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1068                 encap = a[OVS_KEY_ATTR_ENCAP];
1069                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
1070                 encap_valid = true;
1071
1072                 if (tci & htons(VLAN_TAG_PRESENT)) {
1073                         err = parse_flow_nlattrs(encap, a, &key_attrs, log);
1074                         if (err)
1075                                 return err;
1076                 } else if (!tci) {
1077                         /* Corner case for truncated 802.1Q header. */
1078                         if (nla_len(encap)) {
1079                                 OVS_NLERR(log, "Truncated 802.1Q header has non-zero encap attribute.");
1080                                 return -EINVAL;
1081                         }
1082                 } else {
1083                         OVS_NLERR(log, "Encap attr is set for non-VLAN frame");
1084                         return  -EINVAL;
1085                 }
1086         }
1087
1088         err = ovs_key_from_nlattrs(match, key_attrs, a, false, log);
1089         if (err)
1090                 return err;
1091
1092         if (match->mask) {
1093                 if (!nla_mask) {
1094                         /* Create an exact match mask. We need to set to 0xff
1095                          * all the 'match->mask' fields that have been touched
1096                          * in 'match->key'. We cannot simply memset
1097                          * 'match->mask', because padding bytes and fields not
1098                          * specified in 'match->key' should be left to 0.
1099                          * Instead, we use a stream of netlink attributes,
1100                          * copied from 'key' and set to 0xff.
1101                          * ovs_key_from_nlattrs() will take care of filling
1102                          * 'match->mask' appropriately.
1103                          */
1104                         newmask = kmemdup(nla_key,
1105                                           nla_total_size(nla_len(nla_key)),
1106                                           GFP_KERNEL);
1107                         if (!newmask)
1108                                 return -ENOMEM;
1109
1110                         mask_set_nlattr(newmask, 0xff);
1111
1112                         /* The userspace does not send tunnel attributes that
1113                          * are 0, but we should not wildcard them nonetheless.
1114                          */
1115                         if (match->key->tun_key.ipv4_dst)
1116                                 SW_FLOW_KEY_MEMSET_FIELD(match, tun_key,
1117                                                          0xff, true);
1118
1119                         nla_mask = newmask;
1120                 }
1121
1122                 err = parse_flow_mask_nlattrs(nla_mask, a, &mask_attrs, log);
1123                 if (err)
1124                         goto free_newmask;
1125
1126                 /* Always match on tci. */
1127                 SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
1128
1129                 if (mask_attrs & 1ULL << OVS_KEY_ATTR_ENCAP) {
1130                         __be16 eth_type = 0;
1131                         __be16 tci = 0;
1132
1133                         if (!encap_valid) {
1134                                 OVS_NLERR(log, "Encap mask attribute is set for non-VLAN frame.");
1135                                 err = -EINVAL;
1136                                 goto free_newmask;
1137                         }
1138
1139                         mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
1140                         if (a[OVS_KEY_ATTR_ETHERTYPE])
1141                                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1142
1143                         if (eth_type == htons(0xffff)) {
1144                                 mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
1145                                 encap = a[OVS_KEY_ATTR_ENCAP];
1146                                 err = parse_flow_mask_nlattrs(encap, a,
1147                                                               &mask_attrs, log);
1148                                 if (err)
1149                                         goto free_newmask;
1150                         } else {
1151                                 OVS_NLERR(log, "VLAN frames must have an exact match on the TPID (mask=%x).",
1152                                           ntohs(eth_type));
1153                                 err = -EINVAL;
1154                                 goto free_newmask;
1155                         }
1156
1157                         if (a[OVS_KEY_ATTR_VLAN])
1158                                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1159
1160                         if (!(tci & htons(VLAN_TAG_PRESENT))) {
1161                                 OVS_NLERR(log, "VLAN tag present bit must have an exact match (tci_mask=%x).",
1162                                           ntohs(tci));
1163                                 err = -EINVAL;
1164                                 goto free_newmask;
1165                         }
1166                 }
1167
1168                 err = ovs_key_from_nlattrs(match, mask_attrs, a, true, log);
1169                 if (err)
1170                         goto free_newmask;
1171         }
1172
1173         if (!match_validate(match, key_attrs, mask_attrs, log))
1174                 err = -EINVAL;
1175
1176 free_newmask:
1177         kfree(newmask);
1178         return err;
1179 }
1180
1181 static size_t get_ufid_len(const struct nlattr *attr, bool log)
1182 {
1183         size_t len;
1184
1185         if (!attr)
1186                 return 0;
1187
1188         len = nla_len(attr);
1189         if (len < 1 || len > MAX_UFID_LENGTH) {
1190                 OVS_NLERR(log, "ufid size %u bytes exceeds the range (1, %d)",
1191                           nla_len(attr), MAX_UFID_LENGTH);
1192                 return 0;
1193         }
1194
1195         return len;
1196 }
1197
1198 /* Initializes 'flow->ufid', returning true if 'attr' contains a valid UFID,
1199  * or false otherwise.
1200  */
1201 bool ovs_nla_get_ufid(struct sw_flow_id *sfid, const struct nlattr *attr,
1202                       bool log)
1203 {
1204         sfid->ufid_len = get_ufid_len(attr, log);
1205         if (sfid->ufid_len)
1206                 memcpy(sfid->ufid, nla_data(attr), sfid->ufid_len);
1207
1208         return sfid->ufid_len;
1209 }
1210
1211 int ovs_nla_get_identifier(struct sw_flow_id *sfid, const struct nlattr *ufid,
1212                            const struct sw_flow_key *key, bool log)
1213 {
1214         struct sw_flow_key *new_key;
1215
1216         if (ovs_nla_get_ufid(sfid, ufid, log))
1217                 return 0;
1218
1219         /* If UFID was not provided, use unmasked key. */
1220         new_key = kmalloc(sizeof(*new_key), GFP_KERNEL);
1221         if (!new_key)
1222                 return -ENOMEM;
1223         memcpy(new_key, key, sizeof(*key));
1224         sfid->unmasked_key = new_key;
1225
1226         return 0;
1227 }
1228
1229 u32 ovs_nla_get_ufid_flags(const struct nlattr *attr)
1230 {
1231         return attr ? nla_get_u32(attr) : 0;
1232 }
1233
1234 /**
1235  * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
1236  * @key: Receives extracted in_port, priority, tun_key and skb_mark.
1237  * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1238  * sequence.
1239  * @log: Boolean to allow kernel error logging.  Normally true, but when
1240  * probing for feature compatibility this should be passed in as false to
1241  * suppress unnecessary error logging.
1242  *
1243  * This parses a series of Netlink attributes that form a flow key, which must
1244  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
1245  * get the metadata, that is, the parts of the flow key that cannot be
1246  * extracted from the packet itself.
1247  */
1248
1249 int ovs_nla_get_flow_metadata(const struct nlattr *attr,
1250                               struct sw_flow_key *key,
1251                               bool log)
1252 {
1253         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1254         struct sw_flow_match match;
1255         u64 attrs = 0;
1256         int err;
1257
1258         err = parse_flow_nlattrs(attr, a, &attrs, log);
1259         if (err)
1260                 return -EINVAL;
1261
1262         memset(&match, 0, sizeof(match));
1263         match.key = key;
1264
1265         memset(key, 0, OVS_SW_FLOW_KEY_METADATA_SIZE);
1266         key->phy.in_port = DP_MAX_PORTS;
1267
1268         return metadata_from_nlattrs(&match, &attrs, a, false, log);
1269 }
1270
1271 static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
1272                              const struct sw_flow_key *output, bool is_mask,
1273                              struct sk_buff *skb)
1274 {
1275         struct ovs_key_ethernet *eth_key;
1276         struct nlattr *nla, *encap;
1277
1278         if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id))
1279                 goto nla_put_failure;
1280
1281         if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash))
1282                 goto nla_put_failure;
1283
1284         if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
1285                 goto nla_put_failure;
1286
1287         if ((swkey->tun_key.ipv4_dst || is_mask)) {
1288                 const void *opts = NULL;
1289
1290                 if (output->tun_key.tun_flags & TUNNEL_OPTIONS_PRESENT)
1291                         opts = TUN_METADATA_OPTS(output, swkey->tun_opts_len);
1292
1293                 if (ipv4_tun_to_nlattr(skb, &output->tun_key, opts,
1294                                        swkey->tun_opts_len))
1295                         goto nla_put_failure;
1296         }
1297
1298         if (swkey->phy.in_port == DP_MAX_PORTS) {
1299                 if (is_mask && (output->phy.in_port == 0xffff))
1300                         if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
1301                                 goto nla_put_failure;
1302         } else {
1303                 u16 upper_u16;
1304                 upper_u16 = !is_mask ? 0 : 0xffff;
1305
1306                 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
1307                                 (upper_u16 << 16) | output->phy.in_port))
1308                         goto nla_put_failure;
1309         }
1310
1311         if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
1312                 goto nla_put_failure;
1313
1314         nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
1315         if (!nla)
1316                 goto nla_put_failure;
1317
1318         eth_key = nla_data(nla);
1319         ether_addr_copy(eth_key->eth_src, output->eth.src);
1320         ether_addr_copy(eth_key->eth_dst, output->eth.dst);
1321
1322         if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
1323                 __be16 eth_type;
1324                 eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff);
1325                 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
1326                     nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
1327                         goto nla_put_failure;
1328                 encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
1329                 if (!swkey->eth.tci)
1330                         goto unencap;
1331         } else
1332                 encap = NULL;
1333
1334         if (swkey->eth.type == htons(ETH_P_802_2)) {
1335                 /*
1336                  * Ethertype 802.2 is represented in the netlink with omitted
1337                  * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
1338                  * 0xffff in the mask attribute.  Ethertype can also
1339                  * be wildcarded.
1340                  */
1341                 if (is_mask && output->eth.type)
1342                         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
1343                                                 output->eth.type))
1344                                 goto nla_put_failure;
1345                 goto unencap;
1346         }
1347
1348         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
1349                 goto nla_put_failure;
1350
1351         if (swkey->eth.type == htons(ETH_P_IP)) {
1352                 struct ovs_key_ipv4 *ipv4_key;
1353
1354                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
1355                 if (!nla)
1356                         goto nla_put_failure;
1357                 ipv4_key = nla_data(nla);
1358                 ipv4_key->ipv4_src = output->ipv4.addr.src;
1359                 ipv4_key->ipv4_dst = output->ipv4.addr.dst;
1360                 ipv4_key->ipv4_proto = output->ip.proto;
1361                 ipv4_key->ipv4_tos = output->ip.tos;
1362                 ipv4_key->ipv4_ttl = output->ip.ttl;
1363                 ipv4_key->ipv4_frag = output->ip.frag;
1364         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1365                 struct ovs_key_ipv6 *ipv6_key;
1366
1367                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
1368                 if (!nla)
1369                         goto nla_put_failure;
1370                 ipv6_key = nla_data(nla);
1371                 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
1372                                 sizeof(ipv6_key->ipv6_src));
1373                 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
1374                                 sizeof(ipv6_key->ipv6_dst));
1375                 ipv6_key->ipv6_label = output->ipv6.label;
1376                 ipv6_key->ipv6_proto = output->ip.proto;
1377                 ipv6_key->ipv6_tclass = output->ip.tos;
1378                 ipv6_key->ipv6_hlimit = output->ip.ttl;
1379                 ipv6_key->ipv6_frag = output->ip.frag;
1380         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
1381                    swkey->eth.type == htons(ETH_P_RARP)) {
1382                 struct ovs_key_arp *arp_key;
1383
1384                 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
1385                 if (!nla)
1386                         goto nla_put_failure;
1387                 arp_key = nla_data(nla);
1388                 memset(arp_key, 0, sizeof(struct ovs_key_arp));
1389                 arp_key->arp_sip = output->ipv4.addr.src;
1390                 arp_key->arp_tip = output->ipv4.addr.dst;
1391                 arp_key->arp_op = htons(output->ip.proto);
1392                 ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha);
1393                 ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha);
1394         } else if (eth_p_mpls(swkey->eth.type)) {
1395                 struct ovs_key_mpls *mpls_key;
1396
1397                 nla = nla_reserve(skb, OVS_KEY_ATTR_MPLS, sizeof(*mpls_key));
1398                 if (!nla)
1399                         goto nla_put_failure;
1400                 mpls_key = nla_data(nla);
1401                 mpls_key->mpls_lse = output->mpls.top_lse;
1402         }
1403
1404         if ((swkey->eth.type == htons(ETH_P_IP) ||
1405              swkey->eth.type == htons(ETH_P_IPV6)) &&
1406              swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1407
1408                 if (swkey->ip.proto == IPPROTO_TCP) {
1409                         struct ovs_key_tcp *tcp_key;
1410
1411                         nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
1412                         if (!nla)
1413                                 goto nla_put_failure;
1414                         tcp_key = nla_data(nla);
1415                         tcp_key->tcp_src = output->tp.src;
1416                         tcp_key->tcp_dst = output->tp.dst;
1417                         if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
1418                                          output->tp.flags))
1419                                 goto nla_put_failure;
1420                 } else if (swkey->ip.proto == IPPROTO_UDP) {
1421                         struct ovs_key_udp *udp_key;
1422
1423                         nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
1424                         if (!nla)
1425                                 goto nla_put_failure;
1426                         udp_key = nla_data(nla);
1427                         udp_key->udp_src = output->tp.src;
1428                         udp_key->udp_dst = output->tp.dst;
1429                 } else if (swkey->ip.proto == IPPROTO_SCTP) {
1430                         struct ovs_key_sctp *sctp_key;
1431
1432                         nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
1433                         if (!nla)
1434                                 goto nla_put_failure;
1435                         sctp_key = nla_data(nla);
1436                         sctp_key->sctp_src = output->tp.src;
1437                         sctp_key->sctp_dst = output->tp.dst;
1438                 } else if (swkey->eth.type == htons(ETH_P_IP) &&
1439                            swkey->ip.proto == IPPROTO_ICMP) {
1440                         struct ovs_key_icmp *icmp_key;
1441
1442                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
1443                         if (!nla)
1444                                 goto nla_put_failure;
1445                         icmp_key = nla_data(nla);
1446                         icmp_key->icmp_type = ntohs(output->tp.src);
1447                         icmp_key->icmp_code = ntohs(output->tp.dst);
1448                 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
1449                            swkey->ip.proto == IPPROTO_ICMPV6) {
1450                         struct ovs_key_icmpv6 *icmpv6_key;
1451
1452                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
1453                                                 sizeof(*icmpv6_key));
1454                         if (!nla)
1455                                 goto nla_put_failure;
1456                         icmpv6_key = nla_data(nla);
1457                         icmpv6_key->icmpv6_type = ntohs(output->tp.src);
1458                         icmpv6_key->icmpv6_code = ntohs(output->tp.dst);
1459
1460                         if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
1461                             icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
1462                                 struct ovs_key_nd *nd_key;
1463
1464                                 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
1465                                 if (!nla)
1466                                         goto nla_put_failure;
1467                                 nd_key = nla_data(nla);
1468                                 memcpy(nd_key->nd_target, &output->ipv6.nd.target,
1469                                                         sizeof(nd_key->nd_target));
1470                                 ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll);
1471                                 ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll);
1472                         }
1473                 }
1474         }
1475
1476 unencap:
1477         if (encap)
1478                 nla_nest_end(skb, encap);
1479
1480         return 0;
1481
1482 nla_put_failure:
1483         return -EMSGSIZE;
1484 }
1485
1486 int ovs_nla_put_key(const struct sw_flow_key *swkey,
1487                     const struct sw_flow_key *output, int attr, bool is_mask,
1488                     struct sk_buff *skb)
1489 {
1490         int err;
1491         struct nlattr *nla;
1492
1493         nla = nla_nest_start(skb, attr);
1494         if (!nla)
1495                 return -EMSGSIZE;
1496         err = __ovs_nla_put_key(swkey, output, is_mask, skb);
1497         if (err)
1498                 return err;
1499         nla_nest_end(skb, nla);
1500
1501         return 0;
1502 }
1503
1504 /* Called with ovs_mutex or RCU read lock. */
1505 int ovs_nla_put_identifier(const struct sw_flow *flow, struct sk_buff *skb)
1506 {
1507         if (ovs_identifier_is_ufid(&flow->id))
1508                 return nla_put(skb, OVS_FLOW_ATTR_UFID, flow->id.ufid_len,
1509                                flow->id.ufid);
1510
1511         return ovs_nla_put_key(flow->id.unmasked_key, flow->id.unmasked_key,
1512                                OVS_FLOW_ATTR_KEY, false, skb);
1513 }
1514
1515 /* Called with ovs_mutex or RCU read lock. */
1516 int ovs_nla_put_masked_key(const struct sw_flow *flow, struct sk_buff *skb)
1517 {
1518         return ovs_nla_put_key(&flow->mask->key, &flow->key,
1519                                 OVS_FLOW_ATTR_KEY, false, skb);
1520 }
1521
1522 /* Called with ovs_mutex or RCU read lock. */
1523 int ovs_nla_put_mask(const struct sw_flow *flow, struct sk_buff *skb)
1524 {
1525         return ovs_nla_put_key(&flow->key, &flow->mask->key,
1526                                 OVS_FLOW_ATTR_MASK, true, skb);
1527 }
1528
1529 #define MAX_ACTIONS_BUFSIZE     (32 * 1024)
1530
1531 static struct sw_flow_actions *nla_alloc_flow_actions(int size, bool log)
1532 {
1533         struct sw_flow_actions *sfa;
1534
1535         if (size > MAX_ACTIONS_BUFSIZE) {
1536                 OVS_NLERR(log, "Flow action size %u bytes exceeds max", size);
1537                 return ERR_PTR(-EINVAL);
1538         }
1539
1540         sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
1541         if (!sfa)
1542                 return ERR_PTR(-ENOMEM);
1543
1544         sfa->actions_len = 0;
1545         return sfa;
1546 }
1547
1548 /* RCU callback used by ovs_nla_free_flow_actions. */
1549 static void rcu_free_acts_callback(struct rcu_head *rcu)
1550 {
1551         struct sw_flow_actions *sf_acts = container_of(rcu,
1552                         struct sw_flow_actions, rcu);
1553         kfree(sf_acts);
1554 }
1555
1556 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
1557  * The caller must hold rcu_read_lock for this to be sensible.
1558  */
1559 void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
1560 {
1561         call_rcu(&sf_acts->rcu, rcu_free_acts_callback);
1562 }
1563
1564 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
1565                                        int attr_len, bool log)
1566 {
1567
1568         struct sw_flow_actions *acts;
1569         int new_acts_size;
1570         int req_size = NLA_ALIGN(attr_len);
1571         int next_offset = offsetof(struct sw_flow_actions, actions) +
1572                                         (*sfa)->actions_len;
1573
1574         if (req_size <= (ksize(*sfa) - next_offset))
1575                 goto out;
1576
1577         new_acts_size = ksize(*sfa) * 2;
1578
1579         if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
1580                 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
1581                         return ERR_PTR(-EMSGSIZE);
1582                 new_acts_size = MAX_ACTIONS_BUFSIZE;
1583         }
1584
1585         acts = nla_alloc_flow_actions(new_acts_size, log);
1586         if (IS_ERR(acts))
1587                 return (void *)acts;
1588
1589         memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
1590         acts->actions_len = (*sfa)->actions_len;
1591         kfree(*sfa);
1592         *sfa = acts;
1593
1594 out:
1595         (*sfa)->actions_len += req_size;
1596         return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
1597 }
1598
1599 static struct nlattr *__add_action(struct sw_flow_actions **sfa,
1600                                    int attrtype, void *data, int len, bool log)
1601 {
1602         struct nlattr *a;
1603
1604         a = reserve_sfa_size(sfa, nla_attr_size(len), log);
1605         if (IS_ERR(a))
1606                 return a;
1607
1608         a->nla_type = attrtype;
1609         a->nla_len = nla_attr_size(len);
1610
1611         if (data)
1612                 memcpy(nla_data(a), data, len);
1613         memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
1614
1615         return a;
1616 }
1617
1618 static int add_action(struct sw_flow_actions **sfa, int attrtype,
1619                       void *data, int len, bool log)
1620 {
1621         struct nlattr *a;
1622
1623         a = __add_action(sfa, attrtype, data, len, log);
1624         if (IS_ERR(a))
1625                 return PTR_ERR(a);
1626
1627         return 0;
1628 }
1629
1630 static inline int add_nested_action_start(struct sw_flow_actions **sfa,
1631                                           int attrtype, bool log)
1632 {
1633         int used = (*sfa)->actions_len;
1634         int err;
1635
1636         err = add_action(sfa, attrtype, NULL, 0, log);
1637         if (err)
1638                 return err;
1639
1640         return used;
1641 }
1642
1643 static inline void add_nested_action_end(struct sw_flow_actions *sfa,
1644                                          int st_offset)
1645 {
1646         struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
1647                                                                st_offset);
1648
1649         a->nla_len = sfa->actions_len - st_offset;
1650 }
1651
1652 static int __ovs_nla_copy_actions(const struct nlattr *attr,
1653                                   const struct sw_flow_key *key,
1654                                   int depth, struct sw_flow_actions **sfa,
1655                                   __be16 eth_type, __be16 vlan_tci, bool log);
1656
1657 static int validate_and_copy_sample(const struct nlattr *attr,
1658                                     const struct sw_flow_key *key, int depth,
1659                                     struct sw_flow_actions **sfa,
1660                                     __be16 eth_type, __be16 vlan_tci, bool log)
1661 {
1662         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
1663         const struct nlattr *probability, *actions;
1664         const struct nlattr *a;
1665         int rem, start, err, st_acts;
1666
1667         memset(attrs, 0, sizeof(attrs));
1668         nla_for_each_nested(a, attr, rem) {
1669                 int type = nla_type(a);
1670                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
1671                         return -EINVAL;
1672                 attrs[type] = a;
1673         }
1674         if (rem)
1675                 return -EINVAL;
1676
1677         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
1678         if (!probability || nla_len(probability) != sizeof(u32))
1679                 return -EINVAL;
1680
1681         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
1682         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
1683                 return -EINVAL;
1684
1685         /* validation done, copy sample action. */
1686         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE, log);
1687         if (start < 0)
1688                 return start;
1689         err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY,
1690                          nla_data(probability), sizeof(u32), log);
1691         if (err)
1692                 return err;
1693         st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS, log);
1694         if (st_acts < 0)
1695                 return st_acts;
1696
1697         err = __ovs_nla_copy_actions(actions, key, depth + 1, sfa,
1698                                      eth_type, vlan_tci, log);
1699         if (err)
1700                 return err;
1701
1702         add_nested_action_end(*sfa, st_acts);
1703         add_nested_action_end(*sfa, start);
1704
1705         return 0;
1706 }
1707
1708 static int validate_tp_port(const struct sw_flow_key *flow_key,
1709                             __be16 eth_type)
1710 {
1711         if ((eth_type == htons(ETH_P_IP) || eth_type == htons(ETH_P_IPV6)) &&
1712             (flow_key->tp.src || flow_key->tp.dst))
1713                 return 0;
1714
1715         return -EINVAL;
1716 }
1717
1718 void ovs_match_init(struct sw_flow_match *match,
1719                     struct sw_flow_key *key,
1720                     struct sw_flow_mask *mask)
1721 {
1722         memset(match, 0, sizeof(*match));
1723         match->key = key;
1724         match->mask = mask;
1725
1726         memset(key, 0, sizeof(*key));
1727
1728         if (mask) {
1729                 memset(&mask->key, 0, sizeof(mask->key));
1730                 mask->range.start = mask->range.end = 0;
1731         }
1732 }
1733
1734 static int validate_geneve_opts(struct sw_flow_key *key)
1735 {
1736         struct geneve_opt *option;
1737         int opts_len = key->tun_opts_len;
1738         bool crit_opt = false;
1739
1740         option = (struct geneve_opt *)TUN_METADATA_OPTS(key, key->tun_opts_len);
1741         while (opts_len > 0) {
1742                 int len;
1743
1744                 if (opts_len < sizeof(*option))
1745                         return -EINVAL;
1746
1747                 len = sizeof(*option) + option->length * 4;
1748                 if (len > opts_len)
1749                         return -EINVAL;
1750
1751                 crit_opt |= !!(option->type & GENEVE_CRIT_OPT_TYPE);
1752
1753                 option = (struct geneve_opt *)((u8 *)option + len);
1754                 opts_len -= len;
1755         };
1756
1757         key->tun_key.tun_flags |= crit_opt ? TUNNEL_CRIT_OPT : 0;
1758
1759         return 0;
1760 }
1761
1762 static int validate_and_copy_set_tun(const struct nlattr *attr,
1763                                      struct sw_flow_actions **sfa, bool log)
1764 {
1765         struct sw_flow_match match;
1766         struct sw_flow_key key;
1767         struct ovs_tunnel_info *tun_info;
1768         struct nlattr *a;
1769         int start, opts_type;
1770         int err = 0;
1771
1772         ovs_match_init(&match, &key, NULL);
1773         opts_type = ipv4_tun_from_nlattr(nla_data(attr), &match, false, log);
1774         if (opts_type < 0)
1775                 return opts_type;
1776
1777         if (key.tun_opts_len) {
1778                 switch (opts_type) {
1779                 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
1780                         err = validate_geneve_opts(&key);
1781                         if (err < 0)
1782                                 return err;
1783                         break;
1784                 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
1785                         break;
1786                 }
1787         };
1788
1789         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET, log);
1790         if (start < 0)
1791                 return start;
1792
1793         a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL,
1794                          sizeof(*tun_info) + key.tun_opts_len, log);
1795         if (IS_ERR(a))
1796                 return PTR_ERR(a);
1797
1798         tun_info = nla_data(a);
1799         tun_info->tunnel = key.tun_key;
1800         tun_info->options_len = key.tun_opts_len;
1801
1802         if (tun_info->options_len) {
1803                 /* We need to store the options in the action itself since
1804                  * everything else will go away after flow setup. We can append
1805                  * it to tun_info and then point there.
1806                  */
1807                 memcpy((tun_info + 1),
1808                        TUN_METADATA_OPTS(&key, key.tun_opts_len), key.tun_opts_len);
1809                 tun_info->options = (tun_info + 1);
1810
1811         } else {
1812                 tun_info->options = NULL;
1813         }
1814
1815         add_nested_action_end(*sfa, start);
1816
1817         return err;
1818 }
1819
1820 static int validate_set(const struct nlattr *a,
1821                         const struct sw_flow_key *flow_key,
1822                         struct sw_flow_actions **sfa,
1823                         bool *set_tun, __be16 eth_type, bool log)
1824 {
1825         const struct nlattr *ovs_key = nla_data(a);
1826         int key_type = nla_type(ovs_key);
1827
1828         /* There can be only one key in a action */
1829         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
1830                 return -EINVAL;
1831
1832         if (key_type > OVS_KEY_ATTR_MAX ||
1833             (ovs_key_lens[key_type].len != nla_len(ovs_key) &&
1834              ovs_key_lens[key_type].len != OVS_ATTR_NESTED))
1835                 return -EINVAL;
1836
1837         switch (key_type) {
1838         const struct ovs_key_ipv4 *ipv4_key;
1839         const struct ovs_key_ipv6 *ipv6_key;
1840         int err;
1841
1842         case OVS_KEY_ATTR_PRIORITY:
1843         case OVS_KEY_ATTR_SKB_MARK:
1844         case OVS_KEY_ATTR_ETHERNET:
1845                 break;
1846
1847         case OVS_KEY_ATTR_TUNNEL:
1848                 if (eth_p_mpls(eth_type))
1849                         return -EINVAL;
1850
1851                 *set_tun = true;
1852                 err = validate_and_copy_set_tun(a, sfa, log);
1853                 if (err)
1854                         return err;
1855                 break;
1856
1857         case OVS_KEY_ATTR_IPV4:
1858                 if (eth_type != htons(ETH_P_IP))
1859                         return -EINVAL;
1860
1861                 if (!flow_key->ip.proto)
1862                         return -EINVAL;
1863
1864                 ipv4_key = nla_data(ovs_key);
1865                 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
1866                         return -EINVAL;
1867
1868                 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
1869                         return -EINVAL;
1870
1871                 break;
1872
1873         case OVS_KEY_ATTR_IPV6:
1874                 if (eth_type != htons(ETH_P_IPV6))
1875                         return -EINVAL;
1876
1877                 if (!flow_key->ip.proto)
1878                         return -EINVAL;
1879
1880                 ipv6_key = nla_data(ovs_key);
1881                 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
1882                         return -EINVAL;
1883
1884                 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
1885                         return -EINVAL;
1886
1887                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
1888                         return -EINVAL;
1889
1890                 break;
1891
1892         case OVS_KEY_ATTR_TCP:
1893                 if (flow_key->ip.proto != IPPROTO_TCP)
1894                         return -EINVAL;
1895
1896                 return validate_tp_port(flow_key, eth_type);
1897
1898         case OVS_KEY_ATTR_UDP:
1899                 if (flow_key->ip.proto != IPPROTO_UDP)
1900                         return -EINVAL;
1901
1902                 return validate_tp_port(flow_key, eth_type);
1903
1904         case OVS_KEY_ATTR_MPLS:
1905                 if (!eth_p_mpls(eth_type))
1906                         return -EINVAL;
1907                 break;
1908
1909         case OVS_KEY_ATTR_SCTP:
1910                 if (flow_key->ip.proto != IPPROTO_SCTP)
1911                         return -EINVAL;
1912
1913                 return validate_tp_port(flow_key, eth_type);
1914
1915         default:
1916                 return -EINVAL;
1917         }
1918
1919         return 0;
1920 }
1921
1922 static int validate_userspace(const struct nlattr *attr)
1923 {
1924         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
1925                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
1926                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
1927                 [OVS_USERSPACE_ATTR_EGRESS_TUN_PORT] = {.type = NLA_U32 },
1928         };
1929         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
1930         int error;
1931
1932         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
1933                                  attr, userspace_policy);
1934         if (error)
1935                 return error;
1936
1937         if (!a[OVS_USERSPACE_ATTR_PID] ||
1938             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
1939                 return -EINVAL;
1940
1941         return 0;
1942 }
1943
1944 static int copy_action(const struct nlattr *from,
1945                        struct sw_flow_actions **sfa, bool log)
1946 {
1947         int totlen = NLA_ALIGN(from->nla_len);
1948         struct nlattr *to;
1949
1950         to = reserve_sfa_size(sfa, from->nla_len, log);
1951         if (IS_ERR(to))
1952                 return PTR_ERR(to);
1953
1954         memcpy(to, from, totlen);
1955         return 0;
1956 }
1957
1958 static int __ovs_nla_copy_actions(const struct nlattr *attr,
1959                                   const struct sw_flow_key *key,
1960                                   int depth, struct sw_flow_actions **sfa,
1961                                   __be16 eth_type, __be16 vlan_tci, bool log)
1962 {
1963         const struct nlattr *a;
1964         int rem, err;
1965
1966         if (depth >= SAMPLE_ACTION_DEPTH)
1967                 return -EOVERFLOW;
1968
1969         nla_for_each_nested(a, attr, rem) {
1970                 /* Expected argument lengths, (u32)-1 for variable length. */
1971                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
1972                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
1973                         [OVS_ACTION_ATTR_RECIRC] = sizeof(u32),
1974                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
1975                         [OVS_ACTION_ATTR_PUSH_MPLS] = sizeof(struct ovs_action_push_mpls),
1976                         [OVS_ACTION_ATTR_POP_MPLS] = sizeof(__be16),
1977                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
1978                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
1979                         [OVS_ACTION_ATTR_SET] = (u32)-1,
1980                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
1981                         [OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash)
1982                 };
1983                 const struct ovs_action_push_vlan *vlan;
1984                 int type = nla_type(a);
1985                 bool skip_copy;
1986
1987                 if (type > OVS_ACTION_ATTR_MAX ||
1988                     (action_lens[type] != nla_len(a) &&
1989                      action_lens[type] != (u32)-1))
1990                         return -EINVAL;
1991
1992                 skip_copy = false;
1993                 switch (type) {
1994                 case OVS_ACTION_ATTR_UNSPEC:
1995                         return -EINVAL;
1996
1997                 case OVS_ACTION_ATTR_USERSPACE:
1998                         err = validate_userspace(a);
1999                         if (err)
2000                                 return err;
2001                         break;
2002
2003                 case OVS_ACTION_ATTR_OUTPUT:
2004                         if (nla_get_u32(a) >= DP_MAX_PORTS)
2005                                 return -EINVAL;
2006
2007                         break;
2008
2009                 case OVS_ACTION_ATTR_HASH: {
2010                         const struct ovs_action_hash *act_hash = nla_data(a);
2011
2012                         switch (act_hash->hash_alg) {
2013                         case OVS_HASH_ALG_L4:
2014                                 break;
2015                         default:
2016                                 return  -EINVAL;
2017                         }
2018
2019                         break;
2020                 }
2021
2022                 case OVS_ACTION_ATTR_POP_VLAN:
2023                         vlan_tci = htons(0);
2024                         break;
2025
2026                 case OVS_ACTION_ATTR_PUSH_VLAN:
2027                         vlan = nla_data(a);
2028                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
2029                                 return -EINVAL;
2030                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
2031                                 return -EINVAL;
2032                         vlan_tci = vlan->vlan_tci;
2033                         break;
2034
2035                 case OVS_ACTION_ATTR_RECIRC:
2036                         break;
2037
2038                 case OVS_ACTION_ATTR_PUSH_MPLS: {
2039                         const struct ovs_action_push_mpls *mpls = nla_data(a);
2040
2041                         if (!eth_p_mpls(mpls->mpls_ethertype))
2042                                 return -EINVAL;
2043
2044                         /* Prohibit push MPLS other than to a white list
2045                          * for packets that have a known tag order.
2046                          */
2047                         if (vlan_tci & htons(VLAN_TAG_PRESENT) ||
2048                             (eth_type != htons(ETH_P_IP) &&
2049                              eth_type != htons(ETH_P_IPV6) &&
2050                              eth_type != htons(ETH_P_ARP) &&
2051                              eth_type != htons(ETH_P_RARP) &&
2052                              !eth_p_mpls(eth_type)))
2053                                 return -EINVAL;
2054                         eth_type = mpls->mpls_ethertype;
2055                         break;
2056                 }
2057
2058                 case OVS_ACTION_ATTR_POP_MPLS:
2059                         if (vlan_tci & htons(VLAN_TAG_PRESENT) ||
2060                             !eth_p_mpls(eth_type))
2061                                 return -EINVAL;
2062
2063                         /* Disallow subsequent L2.5+ set and mpls_pop actions
2064                          * as there is no check here to ensure that the new
2065                          * eth_type is valid and thus set actions could
2066                          * write off the end of the packet or otherwise
2067                          * corrupt it.
2068                          *
2069                          * Support for these actions is planned using packet
2070                          * recirculation.
2071                          */
2072                         eth_type = htons(0);
2073                         break;
2074
2075                 case OVS_ACTION_ATTR_SET:
2076                         err = validate_set(a, key, sfa,
2077                                            &skip_copy, eth_type, log);
2078                         if (err)
2079                                 return err;
2080                         break;
2081
2082                 case OVS_ACTION_ATTR_SAMPLE:
2083                         err = validate_and_copy_sample(a, key, depth, sfa,
2084                                                        eth_type, vlan_tci, log);
2085                         if (err)
2086                                 return err;
2087                         skip_copy = true;
2088                         break;
2089
2090                 default:
2091                         OVS_NLERR(log, "Unknown Action type %d", type);
2092                         return -EINVAL;
2093                 }
2094                 if (!skip_copy) {
2095                         err = copy_action(a, sfa, log);
2096                         if (err)
2097                                 return err;
2098                 }
2099         }
2100
2101         if (rem > 0)
2102                 return -EINVAL;
2103
2104         return 0;
2105 }
2106
2107 int ovs_nla_copy_actions(const struct nlattr *attr,
2108                          const struct sw_flow_key *key,
2109                          struct sw_flow_actions **sfa, bool log)
2110 {
2111         int err;
2112
2113         *sfa = nla_alloc_flow_actions(nla_len(attr), log);
2114         if (IS_ERR(*sfa))
2115                 return PTR_ERR(*sfa);
2116
2117         err = __ovs_nla_copy_actions(attr, key, 0, sfa, key->eth.type,
2118                                      key->eth.tci, log);
2119         if (err)
2120                 kfree(*sfa);
2121
2122         return err;
2123 }
2124
2125 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
2126 {
2127         const struct nlattr *a;
2128         struct nlattr *start;
2129         int err = 0, rem;
2130
2131         start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
2132         if (!start)
2133                 return -EMSGSIZE;
2134
2135         nla_for_each_nested(a, attr, rem) {
2136                 int type = nla_type(a);
2137                 struct nlattr *st_sample;
2138
2139                 switch (type) {
2140                 case OVS_SAMPLE_ATTR_PROBABILITY:
2141                         if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY,
2142                                     sizeof(u32), nla_data(a)))
2143                                 return -EMSGSIZE;
2144                         break;
2145                 case OVS_SAMPLE_ATTR_ACTIONS:
2146                         st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
2147                         if (!st_sample)
2148                                 return -EMSGSIZE;
2149                         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
2150                         if (err)
2151                                 return err;
2152                         nla_nest_end(skb, st_sample);
2153                         break;
2154                 }
2155         }
2156
2157         nla_nest_end(skb, start);
2158         return err;
2159 }
2160
2161 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
2162 {
2163         const struct nlattr *ovs_key = nla_data(a);
2164         int key_type = nla_type(ovs_key);
2165         struct nlattr *start;
2166         int err;
2167
2168         switch (key_type) {
2169         case OVS_KEY_ATTR_TUNNEL_INFO: {
2170                 struct ovs_tunnel_info *tun_info = nla_data(ovs_key);
2171
2172                 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
2173                 if (!start)
2174                         return -EMSGSIZE;
2175
2176                 err = ipv4_tun_to_nlattr(skb, &tun_info->tunnel,
2177                                          tun_info->options_len ?
2178                                                 tun_info->options : NULL,
2179                                          tun_info->options_len);
2180                 if (err)
2181                         return err;
2182                 nla_nest_end(skb, start);
2183                 break;
2184         }
2185         default:
2186                 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
2187                         return -EMSGSIZE;
2188                 break;
2189         }
2190
2191         return 0;
2192 }
2193
2194 int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
2195 {
2196         const struct nlattr *a;
2197         int rem, err;
2198
2199         nla_for_each_attr(a, attr, len, rem) {
2200                 int type = nla_type(a);
2201
2202                 switch (type) {
2203                 case OVS_ACTION_ATTR_SET:
2204                         err = set_action_to_attr(a, skb);
2205                         if (err)
2206                                 return err;
2207                         break;
2208
2209                 case OVS_ACTION_ATTR_SAMPLE:
2210                         err = sample_action_to_attr(a, skb);
2211                         if (err)
2212                                 return err;
2213                         break;
2214                 default:
2215                         if (nla_put(skb, type, nla_len(a), nla_data(a)))
2216                                 return -EMSGSIZE;
2217                         break;
2218                 }
2219         }
2220
2221         return 0;
2222 }