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 "flow.h"
  22 #include "datapath.h"
  23 #include "mpls.h"
  24 #include <linux/uaccess.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/if_ether.h>
  28 #include <linux/if_vlan.h>
  29 #include <net/llc_pdu.h>
  30 #include <linux/kernel.h>
  31 #include <linux/jhash.h>
  32 #include <linux/jiffies.h>
  33 #include <linux/llc.h>
  34 #include <linux/module.h>
  35 #include <linux/in.h>
  36 #include <linux/rcupdate.h>
  37 #include <linux/if_arp.h>
  38 #include <linux/ip.h>
  39 #include <linux/ipv6.h>
  40 #include <linux/sctp.h>
  41 #include <linux/tcp.h>
  42 #include <linux/udp.h>
  43 #include <linux/icmp.h>
  44 #include <linux/icmpv6.h>
  45 #include <linux/rculist.h>
  46 #include <net/geneve.h>
  47 #include <net/ip.h>
  48 #include <net/ip_tunnels.h>
  49 #include <net/ipv6.h>
  50 #include <net/ndisc.h>
  51
  52 #include "flow_netlink.h"
  53
  54 static void update_range__(struct sw_flow_match *match,
  55                            size_t offset, size_t size, bool is_mask)
  56 {
  57         struct sw_flow_key_range *range = NULL;
  58         size_t start = rounddown(offset, sizeof(long));
  59         size_t end = roundup(offset + size, sizeof(long));
  60
  61         if (!is_mask)
  62                 range = &match->range;
  63         else if (match->mask)
  64                 range = &match->mask->range;
  65
  66         if (!range)
  67                 return;
  68
  69         if (range->start == range->end) {
  70                 range->start = start;
  71                 range->end = end;
  72                 return;
  73         }
  74
  75         if (range->start > start)
  76                 range->start = start;
  77
  78         if (range->end < end)
  79                 range->end = end;
  80 }
  81
  82 #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
  83         do { \
  84                 update_range__(match, offsetof(struct sw_flow_key, field),  \
  85                                      sizeof((match)->key->field), is_mask); \
  86                 if (is_mask) {                                              \
  87                         if ((match)->mask)                                  \
  88                                 (match)->mask->key.field = value;           \
  89                 } else {                                                    \
  90                         (match)->key->field = value;                        \
  91                 }                                                           \
  92         } while (0)
  93
  94 #define SW_FLOW_KEY_MEMCPY_OFFSET(match, offset, value_p, len, is_mask) \
  95         do { \
  96                 update_range__(match, offset, len, is_mask);                \
  97                 if (is_mask) {                                              \
  98                         if ((match)->mask)                                  \
  99                                 memcpy((u8 *)&(match)->mask->key + offset, value_p, len);\
 100                 } else {                                                    \
 101                         memcpy((u8 *)(match)->key + offset, value_p, len);         \
 102                 }                                                           \
 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                         if ((match)->mask)                                  \
 115                                 memset((u8 *)&(match)->mask->key.field, value,\
 116                                        sizeof((match)->mask->key.field));   \
 117                 } else {                                                    \
 118                         memset((u8 *)&(match)->key->field, value,           \
 119                                sizeof((match)->key->field));                \
 120                 }                                                           \
 121         } while (0)
 122
 123 static bool match_validate(const struct sw_flow_match *match,
 124                            u64 key_attrs, u64 mask_attrs)
 125 {
 126         u64 key_expected = 1ULL << OVS_KEY_ATTR_ETHERNET;
 127         u64 mask_allowed = key_attrs;  /* At most allow all key attributes */
 128
 129         /* The following mask attributes allowed only if they
 130          * pass the validation tests. */
 131         mask_allowed &= ~((1ULL << OVS_KEY_ATTR_IPV4)
 132                         | (1ULL << OVS_KEY_ATTR_IPV6)
 133                         | (1ULL << OVS_KEY_ATTR_TCP)
 134                         | (1ULL << OVS_KEY_ATTR_TCP_FLAGS)
 135                         | (1ULL << OVS_KEY_ATTR_UDP)
 136                         | (1ULL << OVS_KEY_ATTR_SCTP)
 137                         | (1ULL << OVS_KEY_ATTR_ICMP)
 138                         | (1ULL << OVS_KEY_ATTR_ICMPV6)
 139                         | (1ULL << OVS_KEY_ATTR_ARP)
 140                         | (1ULL << OVS_KEY_ATTR_ND)
 141                         | (1ULL << OVS_KEY_ATTR_MPLS));
 142
 143         /* Always allowed mask fields. */
 144         mask_allowed |= ((1ULL << OVS_KEY_ATTR_TUNNEL)
 145                        | (1ULL << OVS_KEY_ATTR_IN_PORT)
 146                        | (1ULL << OVS_KEY_ATTR_ETHERTYPE));
 147
 148         /* Check key attributes. */
 149         if (match->key->eth.type == htons(ETH_P_ARP)
 150                         || match->key->eth.type == htons(ETH_P_RARP)) {
 151                 key_expected |= 1ULL << OVS_KEY_ATTR_ARP;
 152                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 153                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ARP;
 154         }
 155
 156
 157         if (eth_p_mpls(match->key->eth.type)) {
 158                 key_expected |= 1ULL << OVS_KEY_ATTR_MPLS;
 159                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 160                         mask_allowed |= 1ULL << OVS_KEY_ATTR_MPLS;
 161         }
 162
 163         if (match->key->eth.type == htons(ETH_P_IP)) {
 164                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV4;
 165                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 166                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV4;
 167
 168                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 169                         if (match->key->ip.proto == IPPROTO_UDP) {
 170                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 171                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 172                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 173                         }
 174
 175                         if (match->key->ip.proto == IPPROTO_SCTP) {
 176                                 key_expected |= 1ULL << OVS_KEY_ATTR_SCTP;
 177                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 178                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_SCTP;
 179                         }
 180
 181                         if (match->key->ip.proto == IPPROTO_TCP) {
 182                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 183                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 184                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 185                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 186                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 187                                 }
 188                         }
 189
 190                         if (match->key->ip.proto == IPPROTO_ICMP) {
 191                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMP;
 192                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 193                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMP;
 194                         }
 195                 }
 196         }
 197
 198         if (match->key->eth.type == htons(ETH_P_IPV6)) {
 199                 key_expected |= 1ULL << OVS_KEY_ATTR_IPV6;
 200                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 201                         mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV6;
 202
 203                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 204                         if (match->key->ip.proto == IPPROTO_UDP) {
 205                                 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
 206                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 207                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
 208                         }
 209
 210                         if (match->key->ip.proto == IPPROTO_SCTP) {
 211                                 key_expected |= 1ULL << OVS_KEY_ATTR_SCTP;
 212                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 213                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_SCTP;
 214                         }
 215
 216                         if (match->key->ip.proto == IPPROTO_TCP) {
 217                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
 218                                 key_expected |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 219                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 220                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
 221                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP_FLAGS;
 222                                 }
 223                         }
 224
 225                         if (match->key->ip.proto == IPPROTO_ICMPV6) {
 226                                 key_expected |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 227                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 228                                         mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMPV6;
 229
 230                                 if (match->key->tp.src ==
 231                                                 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 232                                     match->key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 233                                         key_expected |= 1ULL << OVS_KEY_ATTR_ND;
 234                                         if (match->mask && (match->mask->key.tp.src == htons(0xff)))
 235                                                 mask_allowed |= 1ULL << OVS_KEY_ATTR_ND;
 236                                 }
 237                         }
 238                 }
 239         }
 240
 241         if ((key_attrs & key_expected) != key_expected) {
 242                 /* Key attributes check failed. */
 243                 OVS_NLERR("Missing expected key attributes (key_attrs=%llx, expected=%llx).\n",
 244                                 (unsigned long long)key_attrs, (unsigned long long)key_expected);
 245                 return false;
 246         }
 247
 248         if ((mask_attrs & mask_allowed) != mask_attrs) {
 249                 /* Mask attributes check failed. */
 250                 OVS_NLERR("Contain more than allowed mask fields (mask_attrs=%llx, mask_allowed=%llx).\n",
 251                                 (unsigned long long)mask_attrs, (unsigned long long)mask_allowed);
 252                 return false;
 253         }
 254
 255         return true;
 256 }
 257
 258 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
 259 static const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
 260         [OVS_KEY_ATTR_ENCAP] = -1,
 261         [OVS_KEY_ATTR_PRIORITY] = sizeof(u32),
 262         [OVS_KEY_ATTR_IN_PORT] = sizeof(u32),
 263         [OVS_KEY_ATTR_SKB_MARK] = sizeof(u32),
 264         [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet),
 265         [OVS_KEY_ATTR_VLAN] = sizeof(__be16),
 266         [OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16),
 267         [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
 268         [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
 269         [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
 270         [OVS_KEY_ATTR_TCP_FLAGS] = sizeof(__be16),
 271         [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
 272         [OVS_KEY_ATTR_SCTP] = sizeof(struct ovs_key_sctp),
 273         [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
 274         [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
 275         [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
 276         [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
 277         [OVS_KEY_ATTR_DP_HASH] = sizeof(u32),
 278         [OVS_KEY_ATTR_RECIRC_ID] = sizeof(u32),
 279         [OVS_KEY_ATTR_TUNNEL] = -1,
 280         [OVS_KEY_ATTR_MPLS] = sizeof(struct ovs_key_mpls),
 281 };
 282
 283 static bool is_all_zero(const u8 *fp, size_t size)
 284 {
 285         int i;
 286
 287         if (!fp)
 288                 return false;
 289
 290         for (i = 0; i < size; i++)
 291                 if (fp[i])
 292                         return false;
 293
 294         return true;
 295 }
 296
 297 static int __parse_flow_nlattrs(const struct nlattr *attr,
 298                                 const struct nlattr *a[],
 299                                 u64 *attrsp, bool nz)
 300 {
 301         const struct nlattr *nla;
 302         u64 attrs;
 303         int rem;
 304
 305         attrs = *attrsp;
 306         nla_for_each_nested(nla, attr, rem) {
 307                 u16 type = nla_type(nla);
 308                 int expected_len;
 309
 310                 if (type > OVS_KEY_ATTR_MAX) {
 311                         OVS_NLERR("Unknown key attribute (type=%d, max=%d).\n",
 312                                   type, OVS_KEY_ATTR_MAX);
 313                         return -EINVAL;
 314                 }
 315
 316                 if (attrs & (1ULL << type)) {
 317                         OVS_NLERR("Duplicate key attribute (type %d).\n", type);
 318                         return -EINVAL;
 319                 }
 320
 321                 expected_len = ovs_key_lens[type];
 322                 if (nla_len(nla) != expected_len && expected_len != -1) {
 323                         OVS_NLERR("Key attribute has unexpected length (type=%d"
 324                                   ", length=%d, expected=%d).\n", type,
 325                                   nla_len(nla), expected_len);
 326                         return -EINVAL;
 327                 }
 328
 329                 if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
 330                         attrs |= 1ULL << type;
 331                         a[type] = nla;
 332                 }
 333         }
 334         if (rem) {
 335                 OVS_NLERR("Message has %d unknown bytes.\n", rem);
 336                 return -EINVAL;
 337         }
 338
 339         *attrsp = attrs;
 340         return 0;
 341 }
 342
 343 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
 344                                    const struct nlattr *a[], u64 *attrsp)
 345 {
 346         return __parse_flow_nlattrs(attr, a, attrsp, true);
 347 }
 348
 349 static int parse_flow_nlattrs(const struct nlattr *attr,
 350                               const struct nlattr *a[], u64 *attrsp)
 351 {
 352         return __parse_flow_nlattrs(attr, a, attrsp, false);
 353 }
 354
 355 static int ipv4_tun_from_nlattr(const struct nlattr *attr,
 356                                 struct sw_flow_match *match, bool is_mask)
 357 {
 358         struct nlattr *a;
 359         int rem;
 360         bool ttl = false;
 361         __be16 tun_flags = 0;
 362
 363         nla_for_each_nested(a, attr, rem) {
 364                 int type = nla_type(a);
 365                 static const u32 ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
 366                         [OVS_TUNNEL_KEY_ATTR_ID] = sizeof(u64),
 367                         [OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = sizeof(u32),
 368                         [OVS_TUNNEL_KEY_ATTR_IPV4_DST] = sizeof(u32),
 369                         [OVS_TUNNEL_KEY_ATTR_TOS] = 1,
 370                         [OVS_TUNNEL_KEY_ATTR_TTL] = 1,
 371                         [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = 0,
 372                         [OVS_TUNNEL_KEY_ATTR_CSUM] = 0,
 373                         [OVS_TUNNEL_KEY_ATTR_OAM] = 0,
 374                         [OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS] = -1,
 375                 };
 376
 377                 if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
 378                         OVS_NLERR("Unknown IPv4 tunnel attribute (type=%d, max=%d).\n",
 379                         type, OVS_TUNNEL_KEY_ATTR_MAX);
 380                         return -EINVAL;
 381                 }
 382
 383                 if (ovs_tunnel_key_lens[type] != nla_len(a) &&
 384                     ovs_tunnel_key_lens[type] != -1) {
 385                         OVS_NLERR("IPv4 tunnel attribute type has unexpected "
 386                                   " length (type=%d, length=%d, expected=%d).\n",
 387                                   type, nla_len(a), ovs_tunnel_key_lens[type]);
 388                         return -EINVAL;
 389                 }
 390
 391                 switch (type) {
 392                 case OVS_TUNNEL_KEY_ATTR_ID:
 393                         SW_FLOW_KEY_PUT(match, tun_key.tun_id,
 394                                         nla_get_be64(a), is_mask);
 395                         tun_flags |= TUNNEL_KEY;
 396                         break;
 397                 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
 398                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_src,
 399                                         nla_get_be32(a), is_mask);
 400                         break;
 401                 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
 402                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst,
 403                                         nla_get_be32(a), is_mask);
 404                         break;
 405                 case OVS_TUNNEL_KEY_ATTR_TOS:
 406                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos,
 407                                         nla_get_u8(a), is_mask);
 408                         break;
 409                 case OVS_TUNNEL_KEY_ATTR_TTL:
 410                         SW_FLOW_KEY_PUT(match, tun_key.ipv4_ttl,
 411                                         nla_get_u8(a), is_mask);
 412                         ttl = true;
 413                         break;
 414                 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
 415                         tun_flags |= TUNNEL_DONT_FRAGMENT;
 416                         break;
 417                 case OVS_TUNNEL_KEY_ATTR_CSUM:
 418                         tun_flags |= TUNNEL_CSUM;
 419                         break;
 420                 case OVS_TUNNEL_KEY_ATTR_OAM:
 421                         tun_flags |= TUNNEL_OAM;
 422                         break;
 423                 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
 424                         if (nla_len(a) > sizeof(match->key->tun_opts)) {
 425                                 OVS_NLERR("Geneve option length exceeds "
 426                                           "maximum size (len %d, max %zu).\n",
 427                                           nla_len(a),
 428                                           sizeof(match->key->tun_opts));
 429                                 return -EINVAL;
 430                         }
 431
 432                         if (nla_len(a) % 4 != 0) {
 433                                 OVS_NLERR("Geneve option length is not "
 434                                           "a multiple of 4 (len %d).\n",
 435                                           nla_len(a));
 436                                 return -EINVAL;
 437                         }
 438
 439                         /* We need to record the length of the options passed
 440                          * down, otherwise packets with the same format but
 441                          * additional options will be silently matched.
 442                          */
 443                         if (!is_mask) {
 444                                 SW_FLOW_KEY_PUT(match, tun_opts_len, nla_len(a),
 445                                                 false);
 446                         } else {
 447                                 /* This is somewhat unusual because it looks at
 448                                  * both the key and mask while parsing the
 449                                  * attributes (and by extension assumes the key
 450                                  * is parsed first). Normally, we would verify
 451                                  * that each is the correct length and that the
 452                                  * attributes line up in the validate function.
 453                                  * However, that is difficult because this is
 454                                  * variable length and we won't have the
 455                                  * information later.
 456                                  */
 457                                 if (match->key->tun_opts_len != nla_len(a)) {
 458                                         OVS_NLERR("Geneve option key length (%d)"
 459                                            " is different from mask length (%d).",
 460                                            match->key->tun_opts_len, nla_len(a));
 461                                         return -EINVAL;
 462                                 }
 463
 464                                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff,
 465                                                 true);
 466                         }
 467
 468                         SW_FLOW_KEY_MEMCPY_OFFSET(match,
 469                                 (unsigned long)GENEVE_OPTS((struct sw_flow_key *)0,
 470                                                            nla_len(a)),
 471                                 nla_data(a), nla_len(a), is_mask);
 472                         break;
 473                 default:
 474                         OVS_NLERR("Unknown IPv4 tunnel attribute (%d).\n", type);
 475                         return -EINVAL;
 476                 }
 477         }
 478
 479         SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
 480
 481         if (rem > 0) {
 482                 OVS_NLERR("IPv4 tunnel attribute has %d unknown bytes.\n", rem);
 483                 return -EINVAL;
 484         }
 485
 486         if (!is_mask) {
 487                 if (!match->key->tun_key.ipv4_dst) {
 488                         OVS_NLERR("IPv4 tunnel destination address is zero.\n");
 489                         return -EINVAL;
 490                 }
 491
 492                 if (!ttl) {
 493                         OVS_NLERR("IPv4 tunnel TTL not specified.\n");
 494                         return -EINVAL;
 495                 }
 496         }
 497
 498         return 0;
 499 }
 500
 501 static int ipv4_tun_to_nlattr(struct sk_buff *skb,
 502                               const struct ovs_key_ipv4_tunnel *output,
 503                               const struct geneve_opt *tun_opts,
 504                               int swkey_tun_opts_len)
 505 {
 506         struct nlattr *nla;
 507
 508         nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
 509         if (!nla)
 510                 return -EMSGSIZE;
 511
 512         if (output->tun_flags & TUNNEL_KEY &&
 513             nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id))
 514                 return -EMSGSIZE;
 515         if (output->ipv4_src &&
 516                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src))
 517                 return -EMSGSIZE;
 518         if (output->ipv4_dst &&
 519                 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst))
 520                 return -EMSGSIZE;
 521         if (output->ipv4_tos &&
 522                 nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->ipv4_tos))
 523                 return -EMSGSIZE;
 524         if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl))
 525                 return -EMSGSIZE;
 526         if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
 527                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
 528                 return -EMSGSIZE;
 529         if ((output->tun_flags & TUNNEL_CSUM) &&
 530                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
 531                 return -EMSGSIZE;
 532         if ((output->tun_flags & TUNNEL_OAM) &&
 533                 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_OAM))
 534                 return -EMSGSIZE;
 535         if (tun_opts &&
 536             nla_put(skb, OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS,
 537                     swkey_tun_opts_len, tun_opts))
 538                 return -EMSGSIZE;
 539
 540         nla_nest_end(skb, nla);
 541         return 0;
 542 }
 543
 544
 545 static int metadata_from_nlattrs(struct sw_flow_match *match,  u64 *attrs,
 546                                  const struct nlattr **a, bool is_mask)
 547 {
 548         if (*attrs & (1ULL << OVS_KEY_ATTR_DP_HASH)) {
 549                 u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]);
 550
 551                 SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask);
 552                 *attrs &= ~(1ULL << OVS_KEY_ATTR_DP_HASH);
 553         }
 554
 555         if (*attrs & (1ULL << OVS_KEY_ATTR_RECIRC_ID)) {
 556                 u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]);
 557
 558                 SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask);
 559                 *attrs &= ~(1ULL << OVS_KEY_ATTR_RECIRC_ID);
 560         }
 561
 562         if (*attrs & (1ULL << OVS_KEY_ATTR_PRIORITY)) {
 563                 SW_FLOW_KEY_PUT(match, phy.priority,
 564                           nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
 565                 *attrs &= ~(1ULL << OVS_KEY_ATTR_PRIORITY);
 566         }
 567
 568         if (*attrs & (1ULL << OVS_KEY_ATTR_IN_PORT)) {
 569                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
 570
 571                 if (is_mask) {
 572                         in_port = 0xffffffff; /* Always exact match in_port. */
 573                 } else if (in_port >= DP_MAX_PORTS) {
 574                         OVS_NLERR("Input port (%d) exceeds maximum allowable (%d).\n",
 575                                   in_port, DP_MAX_PORTS);
 576                         return -EINVAL;
 577                 }
 578
 579                 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
 580                 *attrs &= ~(1ULL << OVS_KEY_ATTR_IN_PORT);
 581         } else if (!is_mask) {
 582                 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
 583         }
 584
 585         if (*attrs & (1ULL << OVS_KEY_ATTR_SKB_MARK)) {
 586                 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
 587
 588                 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
 589                 *attrs &= ~(1ULL << OVS_KEY_ATTR_SKB_MARK);
 590         }
 591         if (*attrs & (1ULL << OVS_KEY_ATTR_TUNNEL)) {
 592                 if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
 593                                          is_mask))
 594                         return -EINVAL;
 595                 *attrs &= ~(1ULL << OVS_KEY_ATTR_TUNNEL);
 596         }
 597         return 0;
 598 }
 599
 600 static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
 601                                 const struct nlattr **a, bool is_mask)
 602 {
 603         int err;
 604
 605         err = metadata_from_nlattrs(match, &attrs, a, is_mask);
 606         if (err)
 607                 return err;
 608
 609         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) {
 610                 const struct ovs_key_ethernet *eth_key;
 611
 612                 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
 613                 SW_FLOW_KEY_MEMCPY(match, eth.src,
 614                                 eth_key->eth_src, ETH_ALEN, is_mask);
 615                 SW_FLOW_KEY_MEMCPY(match, eth.dst,
 616                                 eth_key->eth_dst, ETH_ALEN, is_mask);
 617                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERNET);
 618         }
 619
 620         if (attrs & (1ULL << OVS_KEY_ATTR_VLAN)) {
 621                 __be16 tci;
 622
 623                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 624                 if (!(tci & htons(VLAN_TAG_PRESENT))) {
 625                         if (is_mask)
 626                                 OVS_NLERR("VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.\n");
 627                         else
 628                                 OVS_NLERR("VLAN TCI does not have VLAN_TAG_PRESENT bit set.\n");
 629
 630                         return -EINVAL;
 631                 }
 632
 633                 SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
 634                 attrs &= ~(1ULL << OVS_KEY_ATTR_VLAN);
 635         } else if (!is_mask)
 636                 SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
 637
 638         if (attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) {
 639                 __be16 eth_type;
 640
 641                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 642                 if (is_mask) {
 643                         /* Always exact match EtherType. */
 644                         eth_type = htons(0xffff);
 645                 } else if (ntohs(eth_type) < ETH_P_802_3_MIN) {
 646                         OVS_NLERR("EtherType is less than minimum (type=%x, min=%x).\n",
 647                                         ntohs(eth_type), ETH_P_802_3_MIN);
 648                         return -EINVAL;
 649                 }
 650
 651                 SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
 652                 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 653         } else if (!is_mask) {
 654                 SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
 655         }
 656
 657         if (attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
 658                 const struct ovs_key_ipv4 *ipv4_key;
 659
 660                 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
 661                 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
 662                         OVS_NLERR("Unknown IPv4 fragment type (value=%d, max=%d).\n",
 663                                 ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
 664                         return -EINVAL;
 665                 }
 666                 SW_FLOW_KEY_PUT(match, ip.proto,
 667                                 ipv4_key->ipv4_proto, is_mask);
 668                 SW_FLOW_KEY_PUT(match, ip.tos,
 669                                 ipv4_key->ipv4_tos, is_mask);
 670                 SW_FLOW_KEY_PUT(match, ip.ttl,
 671                                 ipv4_key->ipv4_ttl, is_mask);
 672                 SW_FLOW_KEY_PUT(match, ip.frag,
 673                                 ipv4_key->ipv4_frag, is_mask);
 674                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 675                                 ipv4_key->ipv4_src, is_mask);
 676                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 677                                 ipv4_key->ipv4_dst, is_mask);
 678                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV4);
 679         }
 680
 681         if (attrs & (1ULL << OVS_KEY_ATTR_IPV6)) {
 682                 const struct ovs_key_ipv6 *ipv6_key;
 683
 684                 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
 685                 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
 686                         OVS_NLERR("Unknown IPv6 fragment type (value=%d, max=%d).\n",
 687                                 ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
 688                         return -EINVAL;
 689                 }
 690                 SW_FLOW_KEY_PUT(match, ipv6.label,
 691                                 ipv6_key->ipv6_label, is_mask);
 692                 SW_FLOW_KEY_PUT(match, ip.proto,
 693                                 ipv6_key->ipv6_proto, is_mask);
 694                 SW_FLOW_KEY_PUT(match, ip.tos,
 695                                 ipv6_key->ipv6_tclass, is_mask);
 696                 SW_FLOW_KEY_PUT(match, ip.ttl,
 697                                 ipv6_key->ipv6_hlimit, is_mask);
 698                 SW_FLOW_KEY_PUT(match, ip.frag,
 699                                 ipv6_key->ipv6_frag, is_mask);
 700                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
 701                                 ipv6_key->ipv6_src,
 702                                 sizeof(match->key->ipv6.addr.src),
 703                                 is_mask);
 704                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
 705                                 ipv6_key->ipv6_dst,
 706                                 sizeof(match->key->ipv6.addr.dst),
 707                                 is_mask);
 708
 709                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV6);
 710         }
 711
 712         if (attrs & (1ULL << OVS_KEY_ATTR_ARP)) {
 713                 const struct ovs_key_arp *arp_key;
 714
 715                 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
 716                 if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
 717                         OVS_NLERR("Unknown ARP opcode (opcode=%d).\n",
 718                                   arp_key->arp_op);
 719                         return -EINVAL;
 720                 }
 721
 722                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
 723                                 arp_key->arp_sip, is_mask);
 724                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
 725                         arp_key->arp_tip, is_mask);
 726                 SW_FLOW_KEY_PUT(match, ip.proto,
 727                                 ntohs(arp_key->arp_op), is_mask);
 728                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
 729                                 arp_key->arp_sha, ETH_ALEN, is_mask);
 730                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
 731                                 arp_key->arp_tha, ETH_ALEN, is_mask);
 732
 733                 attrs &= ~(1ULL << OVS_KEY_ATTR_ARP);
 734         }
 735
 736         if (attrs & (1ULL << OVS_KEY_ATTR_MPLS)) {
 737                 const struct ovs_key_mpls *mpls_key;
 738
 739                 mpls_key = nla_data(a[OVS_KEY_ATTR_MPLS]);
 740                 SW_FLOW_KEY_PUT(match, mpls.top_lse,
 741                                 mpls_key->mpls_lse, is_mask);
 742
 743                 attrs &= ~(1ULL << OVS_KEY_ATTR_MPLS);
 744         }
 745
 746         if (attrs & (1ULL << OVS_KEY_ATTR_TCP)) {
 747                 const struct ovs_key_tcp *tcp_key;
 748
 749                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
 750                 SW_FLOW_KEY_PUT(match, tp.src, tcp_key->tcp_src, is_mask);
 751                 SW_FLOW_KEY_PUT(match, tp.dst, tcp_key->tcp_dst, is_mask);
 752                 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP);
 753         }
 754
 755         if (attrs & (1ULL << OVS_KEY_ATTR_TCP_FLAGS)) {
 756                 SW_FLOW_KEY_PUT(match, tp.flags,
 757                                 nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
 758                                 is_mask);
 759                 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP_FLAGS);
 760         }
 761
 762         if (attrs & (1ULL << OVS_KEY_ATTR_UDP)) {
 763                 const struct ovs_key_udp *udp_key;
 764
 765                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
 766                 SW_FLOW_KEY_PUT(match, tp.src, udp_key->udp_src, is_mask);
 767                 SW_FLOW_KEY_PUT(match, tp.dst, udp_key->udp_dst, is_mask);
 768                 attrs &= ~(1ULL << OVS_KEY_ATTR_UDP);
 769         }
 770
 771         if (attrs & (1ULL << OVS_KEY_ATTR_SCTP)) {
 772                 const struct ovs_key_sctp *sctp_key;
 773
 774                 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
 775                 SW_FLOW_KEY_PUT(match, tp.src, sctp_key->sctp_src, is_mask);
 776                 SW_FLOW_KEY_PUT(match, tp.dst, sctp_key->sctp_dst, is_mask);
 777                 attrs &= ~(1ULL << OVS_KEY_ATTR_SCTP);
 778         }
 779
 780         if (attrs & (1ULL << OVS_KEY_ATTR_ICMP)) {
 781                 const struct ovs_key_icmp *icmp_key;
 782
 783                 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
 784                 SW_FLOW_KEY_PUT(match, tp.src,
 785                                 htons(icmp_key->icmp_type), is_mask);
 786                 SW_FLOW_KEY_PUT(match, tp.dst,
 787                                 htons(icmp_key->icmp_code), is_mask);
 788                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMP);
 789         }
 790
 791         if (attrs & (1ULL << OVS_KEY_ATTR_ICMPV6)) {
 792                 const struct ovs_key_icmpv6 *icmpv6_key;
 793
 794                 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
 795                 SW_FLOW_KEY_PUT(match, tp.src,
 796                                 htons(icmpv6_key->icmpv6_type), is_mask);
 797                 SW_FLOW_KEY_PUT(match, tp.dst,
 798                                 htons(icmpv6_key->icmpv6_code), is_mask);
 799                 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMPV6);
 800         }
 801
 802         if (attrs & (1ULL << OVS_KEY_ATTR_ND)) {
 803                 const struct ovs_key_nd *nd_key;
 804
 805                 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
 806                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
 807                         nd_key->nd_target,
 808                         sizeof(match->key->ipv6.nd.target),
 809                         is_mask);
 810                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
 811                         nd_key->nd_sll, ETH_ALEN, is_mask);
 812                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
 813                                 nd_key->nd_tll, ETH_ALEN, is_mask);
 814                 attrs &= ~(1ULL << OVS_KEY_ATTR_ND);
 815         }
 816
 817         if (attrs != 0) {
 818                 OVS_NLERR("Unknown key attributes (%llx).\n",
 819                           (unsigned long long)attrs);
 820                 return -EINVAL;
 821         }
 822
 823         return 0;
 824 }
 825
 826 static void nlattr_set(struct nlattr *attr, u8 val, bool is_attr_mask_key)
 827 {
 828         struct nlattr *nla;
 829         int rem;
 830
 831         /* The nlattr stream should already have been validated */
 832         nla_for_each_nested(nla, attr, rem) {
 833                 /* We assume that ovs_key_lens[type] == -1 means that type is a
 834                  * nested attribute
 835                  */
 836                 if (is_attr_mask_key && ovs_key_lens[nla_type(nla)] == -1)
 837                         nlattr_set(nla, val, false);
 838                 else
 839                         memset(nla_data(nla), val, nla_len(nla));
 840         }
 841 }
 842
 843 static void mask_set_nlattr(struct nlattr *attr, u8 val)
 844 {
 845         nlattr_set(attr, val, true);
 846 }
 847
 848 /**
 849  * ovs_nla_get_match - parses Netlink attributes into a flow key and
 850  * mask. In case the 'mask' is NULL, the flow is treated as exact match
 851  * flow. Otherwise, it is treated as a wildcarded flow, except the mask
 852  * does not include any don't care bit.
 853  * @match: receives the extracted flow match information.
 854  * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
 855  * sequence. The fields should of the packet that triggered the creation
 856  * of this flow.
 857  * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
 858  * attribute specifies the mask field of the wildcarded flow.
 859  */
 860 int ovs_nla_get_match(struct sw_flow_match *match,
 861                       const struct nlattr *key,
 862                       const struct nlattr *mask)
 863 {
 864         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
 865         const struct nlattr *encap;
 866         struct nlattr *newmask = NULL;
 867         u64 key_attrs = 0;
 868         u64 mask_attrs = 0;
 869         bool encap_valid = false;
 870         int err;
 871
 872         err = parse_flow_nlattrs(key, a, &key_attrs);
 873         if (err)
 874                 return err;
 875
 876         if ((key_attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) &&
 877             (key_attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) &&
 878             (nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
 879                 __be16 tci;
 880
 881                 if (!((key_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) &&
 882                       (key_attrs & (1ULL << OVS_KEY_ATTR_ENCAP)))) {
 883                         OVS_NLERR("Invalid Vlan frame.\n");
 884                         return -EINVAL;
 885                 }
 886
 887                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 888                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 889                 encap = a[OVS_KEY_ATTR_ENCAP];
 890                 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
 891                 encap_valid = true;
 892
 893                 if (tci & htons(VLAN_TAG_PRESENT)) {
 894                         err = parse_flow_nlattrs(encap, a, &key_attrs);
 895                         if (err)
 896                                 return err;
 897                 } else if (!tci) {
 898                         /* Corner case for truncated 802.1Q header. */
 899                         if (nla_len(encap)) {
 900                                 OVS_NLERR("Truncated 802.1Q header has non-zero encap attribute.\n");
 901                                 return -EINVAL;
 902                         }
 903                 } else {
 904                         OVS_NLERR("Encap attribute is set for a non-VLAN frame.\n");
 905                         return  -EINVAL;
 906                 }
 907         }
 908
 909         err = ovs_key_from_nlattrs(match, key_attrs, a, false);
 910         if (err)
 911                 return err;
 912
 913         if (match->mask && !mask) {
 914                 /* Create an exact match mask. We need to set to 0xff all the
 915                  * 'match->mask' fields that have been touched in 'match->key'.
 916                  * We cannot simply memset 'match->mask', because padding bytes
 917                  * and fields not specified in 'match->key' should be left to 0.
 918                  * Instead, we use a stream of netlink attributes, copied from
 919                  * 'key' and set to 0xff: ovs_key_from_nlattrs() will take care
 920                  * of filling 'match->mask' appropriately.
 921                  */
 922                 newmask = kmemdup(key, nla_total_size(nla_len(key)),
 923                                   GFP_KERNEL);
 924                 if (!newmask)
 925                         return -ENOMEM;
 926
 927                 mask_set_nlattr(newmask, 0xff);
 928
 929                 /* The userspace does not send tunnel attributes that are 0,
 930                  * but we should not wildcard them nonetheless. */
 931                 if (match->key->tun_key.ipv4_dst)
 932                         SW_FLOW_KEY_MEMSET_FIELD(match, tun_key, 0xff, true);
 933
 934                 mask = newmask;
 935         }
 936
 937         if (mask) {
 938                 err = parse_flow_mask_nlattrs(mask, a, &mask_attrs);
 939                 if (err)
 940                         goto free_newmask;
 941
 942                 if (mask_attrs & 1ULL << OVS_KEY_ATTR_ENCAP) {
 943                         __be16 eth_type = 0;
 944                         __be16 tci = 0;
 945
 946                         if (!encap_valid) {
 947                                 OVS_NLERR("Encap mask attribute is set for non-VLAN frame.\n");
 948                                 err = -EINVAL;
 949                                 goto free_newmask;
 950                         }
 951
 952                         mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
 953                         if (a[OVS_KEY_ATTR_ETHERTYPE])
 954                                 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 955
 956                         if (eth_type == htons(0xffff)) {
 957                                 mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
 958                                 encap = a[OVS_KEY_ATTR_ENCAP];
 959                                 err = parse_flow_mask_nlattrs(encap, a, &mask_attrs);
 960                                 if (err)
 961                                         goto free_newmask;
 962                         } else {
 963                                 OVS_NLERR("VLAN frames must have an exact match on the TPID (mask=%x).\n",
 964                                                 ntohs(eth_type));
 965                                 err = -EINVAL;
 966                                 goto free_newmask;
 967                         }
 968
 969                         if (a[OVS_KEY_ATTR_VLAN])
 970                                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 971
 972                         if (!(tci & htons(VLAN_TAG_PRESENT))) {
 973                                 OVS_NLERR("VLAN tag present bit must have an exact match (tci_mask=%x).\n", ntohs(tci));
 974                                 err = -EINVAL;
 975                                 goto free_newmask;
 976                         }
 977                 }
 978
 979                 err = ovs_key_from_nlattrs(match, mask_attrs, a, true);
 980                 if (err)
 981                         goto free_newmask;
 982         }
 983
 984         if (!match_validate(match, key_attrs, mask_attrs))
 985                 err = -EINVAL;
 986
 987 free_newmask:
 988         kfree(newmask);
 989         return err;
 990 }
 991
 992 /**
 993  * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
 994  * @flow: Receives extracted in_port, priority, tun_key and skb_mark.
 995  * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
 996  * sequence.
 997  *
 998  * This parses a series of Netlink attributes that form a flow key, which must
 999  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
1000  * get the metadata, that is, the parts of the flow key that cannot be
1001  * extracted from the packet itself.
1002  */
1003
1004 int ovs_nla_get_flow_metadata(struct sw_flow *flow,
1005                               const struct nlattr *attr)
1006 {
1007         struct ovs_key_ipv4_tunnel *tun_key = &flow->key.tun_key;
1008         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1009         u64 attrs = 0;
1010         int err;
1011         struct sw_flow_match match;
1012
1013         flow->key.phy.in_port = DP_MAX_PORTS;
1014         flow->key.phy.priority = 0;
1015         flow->key.phy.skb_mark = 0;
1016         flow->key.ovs_flow_hash = 0;
1017         flow->key.recirc_id = 0;
1018         memset(tun_key, 0, sizeof(flow->key.tun_key));
1019
1020         err = parse_flow_nlattrs(attr, a, &attrs);
1021         if (err)
1022                 return -EINVAL;
1023
1024         memset(&match, 0, sizeof(match));
1025         match.key = &flow->key;
1026
1027         err = metadata_from_nlattrs(&match, &attrs, a, false);
1028         if (err)
1029                 return err;
1030
1031         return 0;
1032 }
1033
1034 int ovs_nla_put_flow(struct datapath *dp, const struct sw_flow_key *swkey,
1035                      const struct sw_flow_key *output, struct sk_buff *skb)
1036 {
1037         struct ovs_key_ethernet *eth_key;
1038         struct nlattr *nla, *encap;
1039         bool is_mask = (swkey != output);
1040
1041         if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash))
1042                 goto nla_put_failure;
1043
1044         if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id))
1045                 goto nla_put_failure;
1046
1047         if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
1048                 goto nla_put_failure;
1049
1050         if ((swkey->tun_key.ipv4_dst || is_mask)) {
1051                 const struct geneve_opt *opts = NULL;
1052
1053                 if (!is_mask) {
1054                         struct vport *in_port;
1055
1056                         in_port = ovs_vport_ovsl_rcu(dp, swkey->phy.in_port);
1057                         if (in_port->ops->type == OVS_VPORT_TYPE_GENEVE)
1058                                 opts = GENEVE_OPTS(output, swkey->tun_opts_len);
1059                 } else {
1060                         if (output->tun_opts_len)
1061                                 opts = GENEVE_OPTS(output, swkey->tun_opts_len);
1062                 }
1063
1064                 if (ipv4_tun_to_nlattr(skb, &output->tun_key, opts,
1065                                         swkey->tun_opts_len))
1066                         goto nla_put_failure;
1067         }
1068
1069         if (swkey->phy.in_port == DP_MAX_PORTS) {
1070                 if (is_mask && (output->phy.in_port == 0xffff))
1071                         if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
1072                                 goto nla_put_failure;
1073         } else {
1074                 u16 upper_u16;
1075                 upper_u16 = !is_mask ? 0 : 0xffff;
1076
1077                 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
1078                                 (upper_u16 << 16) | output->phy.in_port))
1079                         goto nla_put_failure;
1080         }
1081
1082         if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
1083                 goto nla_put_failure;
1084
1085         nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
1086         if (!nla)
1087                 goto nla_put_failure;
1088
1089         eth_key = nla_data(nla);
1090         ether_addr_copy(eth_key->eth_src, output->eth.src);
1091         ether_addr_copy(eth_key->eth_dst, output->eth.dst);
1092
1093         if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
1094                 __be16 eth_type;
1095                 eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff);
1096                 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
1097                     nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
1098                         goto nla_put_failure;
1099                 encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
1100                 if (!swkey->eth.tci)
1101                         goto unencap;
1102         } else
1103                 encap = NULL;
1104
1105         if (swkey->eth.type == htons(ETH_P_802_2)) {
1106                 /*
1107                  * Ethertype 802.2 is represented in the netlink with omitted
1108                  * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
1109                  * 0xffff in the mask attribute.  Ethertype can also
1110                  * be wildcarded.
1111                  */
1112                 if (is_mask && output->eth.type)
1113                         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
1114                                                 output->eth.type))
1115                                 goto nla_put_failure;
1116                 goto unencap;
1117         }
1118
1119         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
1120                 goto nla_put_failure;
1121
1122         if (swkey->eth.type == htons(ETH_P_IP)) {
1123                 struct ovs_key_ipv4 *ipv4_key;
1124
1125                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
1126                 if (!nla)
1127                         goto nla_put_failure;
1128                 ipv4_key = nla_data(nla);
1129                 ipv4_key->ipv4_src = output->ipv4.addr.src;
1130                 ipv4_key->ipv4_dst = output->ipv4.addr.dst;
1131                 ipv4_key->ipv4_proto = output->ip.proto;
1132                 ipv4_key->ipv4_tos = output->ip.tos;
1133                 ipv4_key->ipv4_ttl = output->ip.ttl;
1134                 ipv4_key->ipv4_frag = output->ip.frag;
1135         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1136                 struct ovs_key_ipv6 *ipv6_key;
1137
1138                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
1139                 if (!nla)
1140                         goto nla_put_failure;
1141                 ipv6_key = nla_data(nla);
1142                 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
1143                                 sizeof(ipv6_key->ipv6_src));
1144                 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
1145                                 sizeof(ipv6_key->ipv6_dst));
1146                 ipv6_key->ipv6_label = output->ipv6.label;
1147                 ipv6_key->ipv6_proto = output->ip.proto;
1148                 ipv6_key->ipv6_tclass = output->ip.tos;
1149                 ipv6_key->ipv6_hlimit = output->ip.ttl;
1150                 ipv6_key->ipv6_frag = output->ip.frag;
1151         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
1152                    swkey->eth.type == htons(ETH_P_RARP)) {
1153                 struct ovs_key_arp *arp_key;
1154
1155                 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
1156                 if (!nla)
1157                         goto nla_put_failure;
1158                 arp_key = nla_data(nla);
1159                 memset(arp_key, 0, sizeof(struct ovs_key_arp));
1160                 arp_key->arp_sip = output->ipv4.addr.src;
1161                 arp_key->arp_tip = output->ipv4.addr.dst;
1162                 arp_key->arp_op = htons(output->ip.proto);
1163                 ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha);
1164                 ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha);
1165         } else if (eth_p_mpls(swkey->eth.type)) {
1166                 struct ovs_key_mpls *mpls_key;
1167
1168                 nla = nla_reserve(skb, OVS_KEY_ATTR_MPLS, sizeof(*mpls_key));
1169                 if (!nla)
1170                         goto nla_put_failure;
1171                 mpls_key = nla_data(nla);
1172                 mpls_key->mpls_lse = output->mpls.top_lse;
1173         }
1174
1175         if ((swkey->eth.type == htons(ETH_P_IP) ||
1176              swkey->eth.type == htons(ETH_P_IPV6)) &&
1177              swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1178
1179                 if (swkey->ip.proto == IPPROTO_TCP) {
1180                         struct ovs_key_tcp *tcp_key;
1181
1182                         nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
1183                         if (!nla)
1184                                 goto nla_put_failure;
1185                         tcp_key = nla_data(nla);
1186                         tcp_key->tcp_src = output->tp.src;
1187                         tcp_key->tcp_dst = output->tp.dst;
1188                         if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
1189                                          output->tp.flags))
1190                                 goto nla_put_failure;
1191                 } else if (swkey->ip.proto == IPPROTO_UDP) {
1192                         struct ovs_key_udp *udp_key;
1193
1194                         nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
1195                         if (!nla)
1196                                 goto nla_put_failure;
1197                         udp_key = nla_data(nla);
1198                         udp_key->udp_src = output->tp.src;
1199                         udp_key->udp_dst = output->tp.dst;
1200                 } else if (swkey->ip.proto == IPPROTO_SCTP) {
1201                         struct ovs_key_sctp *sctp_key;
1202
1203                         nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
1204                         if (!nla)
1205                                 goto nla_put_failure;
1206                         sctp_key = nla_data(nla);
1207                         sctp_key->sctp_src = output->tp.src;
1208                         sctp_key->sctp_dst = output->tp.dst;
1209                 } else if (swkey->eth.type == htons(ETH_P_IP) &&
1210                            swkey->ip.proto == IPPROTO_ICMP) {
1211                         struct ovs_key_icmp *icmp_key;
1212
1213                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
1214                         if (!nla)
1215                                 goto nla_put_failure;
1216                         icmp_key = nla_data(nla);
1217                         icmp_key->icmp_type = ntohs(output->tp.src);
1218                         icmp_key->icmp_code = ntohs(output->tp.dst);
1219                 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
1220                            swkey->ip.proto == IPPROTO_ICMPV6) {
1221                         struct ovs_key_icmpv6 *icmpv6_key;
1222
1223                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
1224                                                 sizeof(*icmpv6_key));
1225                         if (!nla)
1226                                 goto nla_put_failure;
1227                         icmpv6_key = nla_data(nla);
1228                         icmpv6_key->icmpv6_type = ntohs(output->tp.src);
1229                         icmpv6_key->icmpv6_code = ntohs(output->tp.dst);
1230
1231                         if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
1232                             icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
1233                                 struct ovs_key_nd *nd_key;
1234
1235                                 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
1236                                 if (!nla)
1237                                         goto nla_put_failure;
1238                                 nd_key = nla_data(nla);
1239                                 memcpy(nd_key->nd_target, &output->ipv6.nd.target,
1240                                                         sizeof(nd_key->nd_target));
1241                                 ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll);
1242                                 ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll);
1243                         }
1244                 }
1245         }
1246
1247 unencap:
1248         if (encap)
1249                 nla_nest_end(skb, encap);
1250
1251         return 0;
1252
1253 nla_put_failure:
1254         return -EMSGSIZE;
1255 }
1256
1257 #define MAX_ACTIONS_BUFSIZE     (32 * 1024)
1258
1259 struct sw_flow_actions *ovs_nla_alloc_flow_actions(int size)
1260 {
1261         struct sw_flow_actions *sfa;
1262
1263         if (size > MAX_ACTIONS_BUFSIZE) {
1264                 OVS_NLERR("Flow action size (%u bytes) exceeds maximum "
1265                           "(%u bytes)\n", size, MAX_ACTIONS_BUFSIZE);
1266                 return ERR_PTR(-EINVAL);
1267         }
1268
1269         sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
1270         if (!sfa)
1271                 return ERR_PTR(-ENOMEM);
1272
1273         sfa->actions_len = 0;
1274         return sfa;
1275 }
1276
1277 /* RCU callback used by ovs_nla_free_flow_actions. */
1278 static void rcu_free_acts_callback(struct rcu_head *rcu)
1279 {
1280         struct sw_flow_actions *sf_acts = container_of(rcu,
1281                         struct sw_flow_actions, rcu);
1282         kfree(sf_acts);
1283 }
1284
1285 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
1286  * The caller must hold rcu_read_lock for this to be sensible. */
1287 void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
1288 {
1289         call_rcu(&sf_acts->rcu, rcu_free_acts_callback);
1290 }
1291
1292 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
1293                                        int attr_len)
1294 {
1295
1296         struct sw_flow_actions *acts;
1297         int new_acts_size;
1298         int req_size = NLA_ALIGN(attr_len);
1299         int next_offset = offsetof(struct sw_flow_actions, actions) +
1300                                         (*sfa)->actions_len;
1301
1302         if (req_size <= (ksize(*sfa) - next_offset))
1303                 goto out;
1304
1305         new_acts_size = ksize(*sfa) * 2;
1306
1307         if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
1308                 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
1309                         return ERR_PTR(-EMSGSIZE);
1310                 new_acts_size = MAX_ACTIONS_BUFSIZE;
1311         }
1312
1313         acts = ovs_nla_alloc_flow_actions(new_acts_size);
1314         if (IS_ERR(acts))
1315                 return (void *)acts;
1316
1317         memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
1318         acts->actions_len = (*sfa)->actions_len;
1319         kfree(*sfa);
1320         *sfa = acts;
1321
1322 out:
1323         (*sfa)->actions_len += req_size;
1324         return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
1325 }
1326
1327 static struct nlattr *__add_action(struct sw_flow_actions **sfa, int attrtype,
1328                                    void *data, int len)
1329 {
1330         struct nlattr *a;
1331
1332         a = reserve_sfa_size(sfa, nla_attr_size(len));
1333         if (IS_ERR(a))
1334                 return a;
1335
1336         a->nla_type = attrtype;
1337         a->nla_len = nla_attr_size(len);
1338
1339         if (data)
1340                 memcpy(nla_data(a), data, len);
1341         memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
1342
1343         return a;
1344 }
1345
1346 static int add_action(struct sw_flow_actions **sfa, int attrtype,
1347                       void *data, int len)
1348 {
1349         struct nlattr *a;
1350
1351         a = __add_action(sfa, attrtype, data, len);
1352         if (IS_ERR(a))
1353                 return PTR_ERR(a);
1354
1355         return 0;
1356 }
1357
1358 static inline int add_nested_action_start(struct sw_flow_actions **sfa,
1359                                           int attrtype)
1360 {
1361         int used = (*sfa)->actions_len;
1362         int err;
1363
1364         err = add_action(sfa, attrtype, NULL, 0);
1365         if (err)
1366                 return err;
1367
1368         return used;
1369 }
1370
1371 static inline void add_nested_action_end(struct sw_flow_actions *sfa,
1372                                          int st_offset)
1373 {
1374         struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
1375                                                                st_offset);
1376
1377         a->nla_len = sfa->actions_len - st_offset;
1378 }
1379
1380 static int ovs_nla_copy_actions__(const struct nlattr *attr,
1381                                   const struct sw_flow_key *key,
1382                                   int depth, struct sw_flow_actions **sfa,
1383                                   __be16 eth_type, __be16 vlan_tci);
1384
1385 static int validate_and_copy_sample(const struct nlattr *attr,
1386                                     const struct sw_flow_key *key, int depth,
1387                                     struct sw_flow_actions **sfa,
1388                                     __be16 eth_type, __be16 vlan_tci)
1389 {
1390         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
1391         const struct nlattr *probability, *actions;
1392         const struct nlattr *a;
1393         int rem, start, err, st_acts;
1394
1395         memset(attrs, 0, sizeof(attrs));
1396         nla_for_each_nested(a, attr, rem) {
1397                 int type = nla_type(a);
1398                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
1399                         return -EINVAL;
1400                 attrs[type] = a;
1401         }
1402         if (rem)
1403                 return -EINVAL;
1404
1405         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
1406         if (!probability || nla_len(probability) != sizeof(u32))
1407                 return -EINVAL;
1408
1409         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
1410         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
1411                 return -EINVAL;
1412
1413         /* validation done, copy sample action. */
1414         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE);
1415         if (start < 0)
1416                 return start;
1417         err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY,
1418                          nla_data(probability), sizeof(u32));
1419         if (err)
1420                 return err;
1421         st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
1422         if (st_acts < 0)
1423                 return st_acts;
1424
1425         err = ovs_nla_copy_actions__(actions, key, depth + 1, sfa,
1426                                      eth_type, vlan_tci);
1427         if (err)
1428                 return err;
1429
1430         add_nested_action_end(*sfa, st_acts);
1431         add_nested_action_end(*sfa, start);
1432
1433         return 0;
1434 }
1435
1436 static int validate_tp_port(const struct sw_flow_key *flow_key,
1437                             __be16 eth_type)
1438 {
1439         if ((eth_type == htons(ETH_P_IP) || eth_type == htons(ETH_P_IPV6)) &&
1440             (flow_key->tp.src || flow_key->tp.dst))
1441                 return 0;
1442
1443         return -EINVAL;
1444 }
1445
1446 void ovs_match_init(struct sw_flow_match *match,
1447                     struct sw_flow_key *key,
1448                     struct sw_flow_mask *mask)
1449 {
1450         memset(match, 0, sizeof(*match));
1451         match->key = key;
1452         match->mask = mask;
1453
1454         memset(key, 0, sizeof(*key));
1455
1456         if (mask) {
1457                 memset(&mask->key, 0, sizeof(mask->key));
1458                 mask->range.start = mask->range.end = 0;
1459         }
1460 }
1461
1462 static int validate_and_copy_set_tun(const struct nlattr *attr,
1463                                      struct sw_flow_actions **sfa)
1464 {
1465         struct sw_flow_match match;
1466         struct sw_flow_key key;
1467         struct ovs_tunnel_info *tun_info;
1468         struct nlattr *a;
1469         int err, start;
1470
1471         ovs_match_init(&match, &key, NULL);
1472         err = ipv4_tun_from_nlattr(nla_data(attr), &match, false);
1473         if (err)
1474                 return err;
1475
1476         if (key.tun_opts_len) {
1477                 struct geneve_opt *option = GENEVE_OPTS(&key,
1478                                                         key.tun_opts_len);
1479                 int opts_len = key.tun_opts_len;
1480                 bool crit_opt = false;
1481
1482                 while (opts_len > 0) {
1483                         int len;
1484
1485                         if (opts_len < sizeof(*option))
1486                                 return -EINVAL;
1487
1488                         len = sizeof(*option) + option->length * 4;
1489                         if (len > opts_len)
1490                                 return -EINVAL;
1491
1492                         crit_opt |= !!(option->type & GENEVE_CRIT_OPT_TYPE);
1493
1494                         option = (struct geneve_opt *)((u8 *)option + len);
1495                         opts_len -= len;
1496                 };
1497
1498                 key.tun_key.tun_flags |= crit_opt ? TUNNEL_CRIT_OPT : 0;
1499         };
1500
1501         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
1502         if (start < 0)
1503                 return start;
1504
1505         a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL,
1506                         sizeof(*tun_info) + key.tun_opts_len);
1507         if (IS_ERR(a))
1508                 return PTR_ERR(a);
1509
1510         tun_info = nla_data(a);
1511         tun_info->tunnel = key.tun_key;
1512         tun_info->options_len = key.tun_opts_len;
1513
1514         if (tun_info->options_len) {
1515                 /* We need to store the options in the action itself since
1516                  * everything else will go away after flow setup. We can append
1517                  * it to tun_info and then point there.
1518                  */
1519                 tun_info->options = (struct geneve_opt *)(tun_info + 1);
1520                 memcpy(tun_info->options, GENEVE_OPTS(&key, key.tun_opts_len),
1521                         key.tun_opts_len);
1522         } else {
1523                 tun_info->options = NULL;
1524         }
1525
1526         add_nested_action_end(*sfa, start);
1527
1528         return err;
1529 }
1530
1531 static int validate_set(const struct nlattr *a,
1532                         const struct sw_flow_key *flow_key,
1533                         struct sw_flow_actions **sfa,
1534                         bool *set_tun, __be16 eth_type)
1535 {
1536         const struct nlattr *ovs_key = nla_data(a);
1537         int key_type = nla_type(ovs_key);
1538
1539         /* There can be only one key in a action */
1540         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
1541                 return -EINVAL;
1542
1543         if (key_type > OVS_KEY_ATTR_MAX ||
1544             (ovs_key_lens[key_type] != nla_len(ovs_key) &&
1545              ovs_key_lens[key_type] != -1))
1546                 return -EINVAL;
1547
1548         switch (key_type) {
1549         const struct ovs_key_ipv4 *ipv4_key;
1550         const struct ovs_key_ipv6 *ipv6_key;
1551         int err;
1552
1553         case OVS_KEY_ATTR_PRIORITY:
1554         case OVS_KEY_ATTR_SKB_MARK:
1555         case OVS_KEY_ATTR_ETHERNET:
1556                 break;
1557
1558         case OVS_KEY_ATTR_TUNNEL:
1559                 *set_tun = true;
1560                 err = validate_and_copy_set_tun(a, sfa);
1561                 if (err)
1562                         return err;
1563                 break;
1564
1565         case OVS_KEY_ATTR_IPV4:
1566                 if (eth_type != htons(ETH_P_IP))
1567                         return -EINVAL;
1568
1569                 if (!flow_key->ip.proto)
1570                         return -EINVAL;
1571
1572                 ipv4_key = nla_data(ovs_key);
1573                 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
1574                         return -EINVAL;
1575
1576                 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
1577                         return -EINVAL;
1578
1579                 break;
1580
1581         case OVS_KEY_ATTR_IPV6:
1582                 if (eth_type != htons(ETH_P_IPV6))
1583                         return -EINVAL;
1584
1585                 if (!flow_key->ip.proto)
1586                         return -EINVAL;
1587
1588                 ipv6_key = nla_data(ovs_key);
1589                 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
1590                         return -EINVAL;
1591
1592                 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
1593                         return -EINVAL;
1594
1595                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
1596                         return -EINVAL;
1597
1598                 break;
1599
1600         case OVS_KEY_ATTR_TCP:
1601                 if (flow_key->ip.proto != IPPROTO_TCP)
1602                         return -EINVAL;
1603
1604                 return validate_tp_port(flow_key, eth_type);
1605
1606         case OVS_KEY_ATTR_UDP:
1607                 if (flow_key->ip.proto != IPPROTO_UDP)
1608                         return -EINVAL;
1609
1610                 return validate_tp_port(flow_key, eth_type);
1611
1612         case OVS_KEY_ATTR_MPLS:
1613                 if (!eth_p_mpls(eth_type))
1614                         return -EINVAL;
1615                 break;
1616
1617         case OVS_KEY_ATTR_SCTP:
1618                 if (flow_key->ip.proto != IPPROTO_SCTP)
1619                         return -EINVAL;
1620
1621                 return validate_tp_port(flow_key, eth_type);
1622
1623         default:
1624                 return -EINVAL;
1625         }
1626
1627         return 0;
1628 }
1629
1630 static int validate_userspace(const struct nlattr *attr)
1631 {
1632         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
1633                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
1634                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
1635         };
1636         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
1637         int error;
1638
1639         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
1640                                  attr, userspace_policy);
1641         if (error)
1642                 return error;
1643
1644         if (!a[OVS_USERSPACE_ATTR_PID] ||
1645             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
1646                 return -EINVAL;
1647
1648         return 0;
1649 }
1650
1651 static int copy_action(const struct nlattr *from,
1652                        struct sw_flow_actions **sfa)
1653 {
1654         int totlen = NLA_ALIGN(from->nla_len);
1655         struct nlattr *to;
1656
1657         to = reserve_sfa_size(sfa, from->nla_len);
1658         if (IS_ERR(to))
1659                 return PTR_ERR(to);
1660
1661         memcpy(to, from, totlen);
1662         return 0;
1663 }
1664
1665 static int ovs_nla_copy_actions__(const struct nlattr *attr,
1666                                   const struct sw_flow_key *key,
1667                                   int depth, struct sw_flow_actions **sfa,
1668                                   __be16 eth_type, __be16 vlan_tci)
1669 {
1670         const struct nlattr *a;
1671         int rem, err;
1672
1673         if (depth >= SAMPLE_ACTION_DEPTH)
1674                 return -EOVERFLOW;
1675
1676         nla_for_each_nested(a, attr, rem) {
1677                 /* Expected argument lengths, (u32)-1 for variable length. */
1678                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
1679                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
1680                         [OVS_ACTION_ATTR_RECIRC] = sizeof(u32),
1681                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
1682                         [OVS_ACTION_ATTR_PUSH_MPLS] = sizeof(struct ovs_action_push_mpls),
1683                         [OVS_ACTION_ATTR_POP_MPLS] = sizeof(__be16),
1684                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
1685                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
1686                         [OVS_ACTION_ATTR_SET] = (u32)-1,
1687                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
1688                         [OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash)
1689                 };
1690                 const struct ovs_action_push_vlan *vlan;
1691                 int type = nla_type(a);
1692                 bool skip_copy;
1693
1694                 if (type > OVS_ACTION_ATTR_MAX ||
1695                     (action_lens[type] != nla_len(a) &&
1696                      action_lens[type] != (u32)-1))
1697                         return -EINVAL;
1698
1699                 skip_copy = false;
1700                 switch (type) {
1701                 case OVS_ACTION_ATTR_UNSPEC:
1702                         return -EINVAL;
1703
1704                 case OVS_ACTION_ATTR_USERSPACE:
1705                         err = validate_userspace(a);
1706                         if (err)
1707                                 return err;
1708                         break;
1709
1710                 case OVS_ACTION_ATTR_OUTPUT:
1711                         if (nla_get_u32(a) >= DP_MAX_PORTS)
1712                                 return -EINVAL;
1713                         break;
1714
1715                 case OVS_ACTION_ATTR_HASH: {
1716                         const struct ovs_action_hash *act_hash = nla_data(a);
1717
1718                         switch (act_hash->hash_alg) {
1719                         case OVS_HASH_ALG_L4:
1720                                 break;
1721                         default:
1722                                 return  -EINVAL;
1723                         }
1724
1725                         break;
1726                 }
1727
1728                 case OVS_ACTION_ATTR_POP_VLAN:
1729                         vlan_tci = htons(0);
1730                         break;
1731
1732                 case OVS_ACTION_ATTR_PUSH_VLAN:
1733                         vlan = nla_data(a);
1734                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
1735                                 return -EINVAL;
1736                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
1737                                 return -EINVAL;
1738                         vlan_tci = vlan->vlan_tci;
1739                         break;
1740
1741                 case OVS_ACTION_ATTR_RECIRC:
1742                         break;
1743
1744                 case OVS_ACTION_ATTR_PUSH_MPLS: {
1745                         const struct ovs_action_push_mpls *mpls = nla_data(a);
1746
1747                         if (!eth_p_mpls(mpls->mpls_ethertype))
1748                                 return -EINVAL;
1749                         /* Prohibit push MPLS other than to a white list
1750                          * for packets that have a known tag order.
1751                          */
1752                         if (vlan_tci & htons(VLAN_TAG_PRESENT) ||
1753                             (eth_type != htons(ETH_P_IP) &&
1754                              eth_type != htons(ETH_P_IPV6) &&
1755                              eth_type != htons(ETH_P_ARP) &&
1756                              eth_type != htons(ETH_P_RARP) &&
1757                              !eth_p_mpls(eth_type)))
1758                                 return -EINVAL;
1759                         eth_type = mpls->mpls_ethertype;
1760                         break;
1761                 }
1762
1763                 case OVS_ACTION_ATTR_POP_MPLS:
1764                         if (vlan_tci & htons(VLAN_TAG_PRESENT) ||
1765                             !eth_p_mpls(eth_type))
1766                                 return -EINVAL;
1767
1768                         /* Disallow subsequent L2.5+ set and mpls_pop actions
1769                          * as there is no check here to ensure that the new
1770                          * eth_type is valid and thus set actions could
1771                          * write off the end of the packet or otherwise
1772                          * corrupt it.
1773                          *
1774                          * Support for these actions is planned using packet
1775                          * recirculation.
1776                          */
1777                         eth_type = htons(0);
1778                         break;
1779
1780                 case OVS_ACTION_ATTR_SET:
1781                         err = validate_set(a, key, sfa, &skip_copy, eth_type);
1782                         if (err)
1783                                 return err;
1784                         break;
1785
1786                 case OVS_ACTION_ATTR_SAMPLE:
1787                         err = validate_and_copy_sample(a, key, depth, sfa,
1788                                                        eth_type, vlan_tci);
1789                         if (err)
1790                                 return err;
1791                         skip_copy = true;
1792                         break;
1793
1794                 default:
1795                         return -EINVAL;
1796                 }
1797                 if (!skip_copy) {
1798                         err = copy_action(a, sfa);
1799                         if (err)
1800                                 return err;
1801                 }
1802         }
1803
1804         if (rem > 0)
1805                 return -EINVAL;
1806
1807         return 0;
1808 }
1809
1810 int ovs_nla_copy_actions(const struct nlattr *attr,
1811                          const struct sw_flow_key *key,
1812                          struct sw_flow_actions **sfa)
1813 {
1814         return ovs_nla_copy_actions__(attr, key, 0, sfa, key->eth.type,
1815                                       key->eth.tci);
1816 }
1817
1818 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
1819 {
1820         const struct nlattr *a;
1821         struct nlattr *start;
1822         int err = 0, rem;
1823
1824         start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
1825         if (!start)
1826                 return -EMSGSIZE;
1827
1828         nla_for_each_nested(a, attr, rem) {
1829                 int type = nla_type(a);
1830                 struct nlattr *st_sample;
1831
1832                 switch (type) {
1833                 case OVS_SAMPLE_ATTR_PROBABILITY:
1834                         if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY,
1835                                     sizeof(u32), nla_data(a)))
1836                                 return -EMSGSIZE;
1837                         break;
1838                 case OVS_SAMPLE_ATTR_ACTIONS:
1839                         st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
1840                         if (!st_sample)
1841                                 return -EMSGSIZE;
1842                         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
1843                         if (err)
1844                                 return err;
1845                         nla_nest_end(skb, st_sample);
1846                         break;
1847                 }
1848         }
1849
1850         nla_nest_end(skb, start);
1851         return err;
1852 }
1853
1854 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
1855 {
1856         const struct nlattr *ovs_key = nla_data(a);
1857         int key_type = nla_type(ovs_key);
1858         struct nlattr *start;
1859         int err;
1860
1861         switch (key_type) {
1862         case OVS_KEY_ATTR_TUNNEL_INFO: {
1863                 struct ovs_tunnel_info *tun_info = nla_data(ovs_key);
1864
1865                 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
1866                 if (!start)
1867                         return -EMSGSIZE;
1868
1869                 err = ipv4_tun_to_nlattr(skb, &tun_info->tunnel,
1870                                          tun_info->options_len ?
1871                                                 tun_info->options : NULL,
1872                                          tun_info->options_len);
1873                 if (err)
1874                         return err;
1875                 nla_nest_end(skb, start);
1876                 break;
1877         }
1878         default:
1879                 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
1880                         return -EMSGSIZE;
1881                 break;
1882         }
1883
1884         return 0;
1885 }
1886
1887 int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
1888 {
1889         const struct nlattr *a;
1890         int rem, err;
1891
1892         nla_for_each_attr(a, attr, len, rem) {
1893                 int type = nla_type(a);
1894
1895                 switch (type) {
1896                 case OVS_ACTION_ATTR_SET:
1897                         err = set_action_to_attr(a, skb);
1898                         if (err)
1899                                 return err;
1900                         break;
1901
1902                 case OVS_ACTION_ATTR_SAMPLE:
1903                         err = sample_action_to_attr(a, skb);
1904                         if (err)
1905                                 return err;
1906                         break;
1907                 default:
1908                         if (nla_put(skb, type, nla_len(a), nla_data(a)))
1909                                 return -EMSGSIZE;
1910                         break;
1911                 }
1912         }
1913
1914         return 0;
1915 }