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