net/openvswitch/flow_netlink.c

   1 /*
   2  * Copyright (c) 2007-2017 Nicira, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21 #include "flow.h"
  22 #include "datapath.h"
  23 #include <linux/uaccess.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/if_vlan.h>
  28 #include <net/llc_pdu.h>
  29 #include <linux/kernel.h>
  30 #include <linux/jhash.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/llc.h>
  33 #include <linux/module.h>
  34 #include <linux/in.h>
  35 #include <linux/rcupdate.h>
  36 #include <linux/if_arp.h>
  37 #include <linux/ip.h>
  38 #include <linux/ipv6.h>
  39 #include <linux/sctp.h>
  40 #include <linux/tcp.h>
  41 #include <linux/udp.h>
  42 #include <linux/icmp.h>
  43 #include <linux/icmpv6.h>
  44 #include <linux/rculist.h>
  45 #include <net/geneve.h>
  46 #include <net/ip.h>
  47 #include <net/ipv6.h>
  48 #include <net/ndisc.h>
  49 #include <net/mpls.h>
  50 #include <net/vxlan.h>
  51
  52 #include "flow_netlink.h"
  53
  54 struct ovs_len_tbl {
  55         int len;
  56         const struct ovs_len_tbl *next;
  57 };
  58
  59 #define OVS_ATTR_NESTED -1
  60 #define OVS_ATTR_VARIABLE -2
  61
  62 static bool actions_may_change_flow(const struct nlattr *actions)
  63 {
  64         struct nlattr *nla;
  65         int rem;
  66
  67         nla_for_each_nested(nla, actions, rem) {
  68                 u16 action = nla_type(nla);
  69
  70                 switch (action) {
  71                 case OVS_ACTION_ATTR_OUTPUT:
  72                 case OVS_ACTION_ATTR_RECIRC:
  73                 case OVS_ACTION_ATTR_TRUNC:
  74                 case OVS_ACTION_ATTR_USERSPACE:
  75                         break;
  76
  77                 case OVS_ACTION_ATTR_CT:
  78                 case OVS_ACTION_ATTR_HASH:
  79                 case OVS_ACTION_ATTR_POP_ETH:
  80                 case OVS_ACTION_ATTR_POP_MPLS:
  81                 case OVS_ACTION_ATTR_POP_VLAN:
  82                 case OVS_ACTION_ATTR_PUSH_ETH:
  83                 case OVS_ACTION_ATTR_PUSH_MPLS:
  84                 case OVS_ACTION_ATTR_PUSH_VLAN:
  85                 case OVS_ACTION_ATTR_SAMPLE:
  86                 case OVS_ACTION_ATTR_SET:
  87                 case OVS_ACTION_ATTR_SET_MASKED:
  88                 default:
  89                         return true;
  90                 }
  91         }
  92         return false;
  93 }
  94
  95 static void update_range(struct sw_flow_match *match,
  96                          size_t offset, size_t size, bool is_mask)
  97 {
  98         struct sw_flow_key_range *range;
  99         size_t start = rounddown(offset, sizeof(long));
 100         size_t end = roundup(offset + size, sizeof(long));
 101
 102         if (!is_mask)
 103                 range = &match->range;
 104         else
 105                 range = &match->mask->range;
 106
 107         if (range->start == range->end) {
 108                 range->start = start;
 109                 range->end = end;
 110                 return;
 111         }
 112
 113         if (range->start > start)
 114                 range->start = start;
 115
 116         if (range->end < end)
 117                 range->end = end;
 118 }
 119
 120 #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
 121         do { \
 122                 update_range(match, offsetof(struct sw_flow_key, field),    \
 123                              sizeof((match)->key->field), is_mask);         \
 124                 if (is_mask)                                                \
 125                         (match)->mask->key.field = value;                   \
 126                 else                                                        \
 127                         (match)->key->field = value;                        \
 128         } while (0)
 129
 130 #define SW_FLOW_KEY_MEMCPY_OFFSET(match, offset, value_p, len, is_mask)     \
 131         do {                                                                \
 132                 update_range(match, offset, len, is_mask);                  \
 133                 if (is_mask)                                                \
 134                         memcpy((u8 *)&(match)->mask->key + offset, value_p, \
 135                                len);                                       \
 136                 else                                                        \
 137                         memcpy((u8 *)(match)->key + offset, value_p, len);  \
 138         } while (0)
 139
 140 #define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask)               \
 141         SW_FLOW_KEY_MEMCPY_OFFSET(match, offsetof(struct sw_flow_key, field), \
 142                                   value_p, len, is_mask)
 143
 144 #define SW_FLOW_KEY_MEMSET_FIELD(match, field, value, is_mask)              \
 145         do {                                                                \
 146                 update_range(match, offsetof(struct sw_flow_key, field),    \
 147                              sizeof((match)->key->field), is_mask);         \
 148                 if (is_mask)                                                \
 149                         memset((u8 *)&(match)->mask->key.field, value,      \
 150                                sizeof((match)->mask->key.field));           \
 151                 else                                                        \
 152                         memset((u8 *)&(match)->key->field, value,           \
 153                                sizeof((match)->key->field));                \
 154         } while (0)
 155
 156 static bool match_validate(const struct sw_flow_match *match,
 157                            u64 key_attrs, u64 mask_attrs, bool log)
 158 {
 159         u64 key_expected = 0;
 160         u64 mask_allowed = key_attrs;  /* At most allow all key attributes */
 161
 162         /* The following mask attributes allowed only if they
 163          * pass the validation tests. */
 164         mask_allowed &= ~((1 << OVS_KEY_ATTR_IPV4)
 165                         | (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4)
 166                         | (1 << OVS_KEY_ATTR_IPV6)
 167                         | (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)
 168                         | (1 << OVS_KEY_ATTR_TCP)
 169                         | (1 << OVS_KEY_ATTR_TCP_FLAGS)
 170                         | (1 << OVS_KEY_ATTR_UDP)
 171                         | (1 << OVS_KEY_ATTR_SCTP)
 172                         | (1 << OVS_KEY_ATTR_ICMP)
 173                         | (1 << OVS_KEY_ATTR_ICMPV6)
 174                         | (1 << OVS_KEY_ATTR_ARP)
 175                         | (1 << OVS_KEY_ATTR_ND)
 176                         | (1 << OVS_KEY_ATTR_MPLS));
 177
 178         /* Always allowed mask fields. */
 179         mask_allowed |= ((1 << OVS_KEY_ATTR_TUNNEL)
 180                        | (1 << OVS_KEY_ATTR_IN_PORT)
 181                        | (1 << OVS_KEY_ATTR_ETHERTYPE));
 182
 183         /* Check key attributes. */
 184         if (match->key->eth.type == htons(ETH_P_ARP)
 185                         || match->key->eth.type == htons(ETH_P_RARP)) {
 186                 key_expected |= 1 << OVS_KEY_ATTR_ARP;
 187                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 188                         mask_allowed |= 1 << OVS_KEY_ATTR_ARP;
 189         }
 190
 191         if (eth_p_mpls(match->key->eth.type)) {
 192                 key_expected |= 1 << OVS_KEY_ATTR_MPLS;
 193                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 194                         mask_allowed |= 1 << OVS_KEY_ATTR_MPLS;
 195         }
 196
 197         if (match->key->eth.type == htons(ETH_P_IP)) {
 198                 key_expected |= 1 << OVS_KEY_ATTR_IPV4;
 199                 if (match->mask && match->mask->key.eth.type == htons(0xffff)) {
 200                         mask_allowed |= 1 << OVS_KEY_ATTR_IPV4;
 201                         mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4;
 202                 }
 203
 204                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 205                         if (match->key->ip.proto == IPPROTO_UDP) {
 206                                 key_expected |= 1 << OVS_KEY_ATTR_UDP;
 207                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 208                                         mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
 209                         }
 210
 211                         if (match->key->ip.proto == IPPROTO_SCTP) {
 212                                 key_expected |= 1 << OVS_KEY_ATTR_SCTP;
 213                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 214                                         mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
 215                         }
 216
 217                         if (match->key->ip.proto == IPPROTO_TCP) {
 218                                 key_expected |= 1 << OVS_KEY_ATTR_TCP;
 219                                 key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 220                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 221                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
 222                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 223                                 }
 224                         }
 225
 226                         if (match->key->ip.proto == IPPROTO_ICMP) {
 227                                 key_expected |= 1 << OVS_KEY_ATTR_ICMP;
 228                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 229                                         mask_allowed |= 1 << OVS_KEY_ATTR_ICMP;
 230                         }
 231                 }
 232         }
 233
 234         if (match->key->eth.type == htons(ETH_P_IPV6)) {
 235                 key_expected |= 1 << OVS_KEY_ATTR_IPV6;
 236                 if (match->mask && match->mask->key.eth.type == htons(0xffff)) {
 237                         mask_allowed |= 1 << OVS_KEY_ATTR_IPV6;
 238                         mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6;
 239                 }
 240
 241                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 242                         if (match->key->ip.proto == IPPROTO_UDP) {
 243                                 key_expected |= 1 << OVS_KEY_ATTR_UDP;
 244                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 245                                         mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
 246                         }
 247
 248                         if (match->key->ip.proto == IPPROTO_SCTP) {
 249                                 key_expected |= 1 << OVS_KEY_ATTR_SCTP;
 250                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 251                                         mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
 252                         }
 253
 254                         if (match->key->ip.proto == IPPROTO_TCP) {
 255                                 key_expected |= 1 << OVS_KEY_ATTR_TCP;
 256                                 key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 257                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 258                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
 259                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 260                                 }
 261                         }
 262
 263                         if (match->key->ip.proto == IPPROTO_ICMPV6) {
 264                                 key_expected |= 1 << OVS_KEY_ATTR_ICMPV6;
 265                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 266                                         mask_allowed |= 1 << OVS_KEY_ATTR_ICMPV6;
 267
 268                                 if (match->key->tp.src ==
 269                                                 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 270                                     match->key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 271                                         key_expected |= 1 << OVS_KEY_ATTR_ND;
 272                                         /* Original direction conntrack tuple
 273                                          * uses the same space as the ND fields
 274                                          * in the key, so both are not allowed
 275                                          * at the same time.
 276                                          */
 277                                         mask_allowed &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6);
 278                                         if (match->mask && (match->mask->key.tp.src == htons(0xff)))
 279                                                 mask_allowed |= 1 << OVS_KEY_ATTR_ND;
 280                                 }
 281                         }
 282                 }
 283         }
 284
 285         if ((key_attrs & key_expected) != key_expected) {
 286                 /* Key attributes check failed. */
 287                 OVS_NLERR(log, "Missing key (keys=%llx, expected=%llx)",
 288                           (unsigned long long)key_attrs,
 289                           (unsigned long long)key_expected);
 290                 return false;
 291         }
 292
 293         if ((mask_attrs & mask_allowed) != mask_attrs) {
 294                 /* Mask attributes check failed. */
 295                 OVS_NLERR(log, "Unexpected mask (mask=%llx, allowed=%llx)",
 296                           (unsigned long long)mask_attrs,
 297                           (unsigned long long)mask_allowed);
 298                 return false;
 299         }
 300
 301         return true;
 302 }
 303
 304 size_t ovs_tun_key_attr_size(void)
 305 {
 306         /* Whenever adding new OVS_TUNNEL_KEY_ FIELDS, we should consider
 307          * updating this function.
 308          */
 309         return    nla_total_size_64bit(8) /* OVS_TUNNEL_KEY_ATTR_ID */
 310                 + nla_total_size(16)   /* OVS_TUNNEL_KEY_ATTR_IPV[46]_SRC */
 311                 + nla_total_size(16)   /* OVS_TUNNEL_KEY_ATTR_IPV[46]_DST */
 312                 + nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TOS */
 313                 + nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TTL */
 314                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
 315                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_CSUM */
 316                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_OAM */
 317                 + nla_total_size(256)  /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */
 318                 /* OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS is mutually exclusive with
 319                  * OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS and covered by it.
 320                  */
 321                 + nla_total_size(2)    /* OVS_TUNNEL_KEY_ATTR_TP_SRC */
 322                 + nla_total_size(2);   /* OVS_TUNNEL_KEY_ATTR_TP_DST */
 323 }
 324
 325 size_t ovs_key_attr_size(void)
 326 {
 327         /* Whenever adding new OVS_KEY_ FIELDS, we should consider
 328          * updating this function.
 329          */
 330         BUILD_BUG_ON(OVS_KEY_ATTR_TUNNEL_INFO != 28);
 331
 332         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
 333                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
 334                   + ovs_tun_key_attr_size()
 335                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
 336                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
 337                 + nla_total_size(4)   /* OVS_KEY_ATTR_DP_HASH */
 338                 + nla_total_size(4)   /* OVS_KEY_ATTR_RECIRC_ID */
 339                 + nla_total_size(4)   /* OVS_KEY_ATTR_CT_STATE */
 340                 + nla_total_size(2)   /* OVS_KEY_ATTR_CT_ZONE */
 341                 + nla_total_size(4)   /* OVS_KEY_ATTR_CT_MARK */
 342                 + nla_total_size(16)  /* OVS_KEY_ATTR_CT_LABELS */
 343                 + nla_total_size(40)  /* OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6 */
 344                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
 345                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 346                 + nla_total_size(4)   /* OVS_KEY_ATTR_VLAN */
 347                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
 348                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 349                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
 350                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
 351                 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
 352 }
 353
 354 static const struct ovs_len_tbl ovs_vxlan_ext_key_lens[OVS_VXLAN_EXT_MAX + 1] = {
 355         [OVS_VXLAN_EXT_GBP]         = { .len = sizeof(u32) },
 356 };
 357
 358 static const struct ovs_len_tbl ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
 359         [OVS_TUNNEL_KEY_ATTR_ID]            = { .len = sizeof(u64) },
 360         [OVS_TUNNEL_KEY_ATTR_IPV4_SRC]      = { .len = sizeof(u32) },
 361         [OVS_TUNNEL_KEY_ATTR_IPV4_DST]      = { .len = sizeof(u32) },
 362         [OVS_TUNNEL_KEY_ATTR_TOS]           = { .len = 1 },
 363         [OVS_TUNNEL_KEY_ATTR_TTL]           = { .len = 1 },
 364         [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = { .len = 0 },
 365         [OVS_TUNNEL_KEY_ATTR_CSUM]          = { .len = 0 },
 366         [OVS_TUNNEL_KEY_ATTR_TP_SRC]        = { .len = sizeof(u16) },
 367         [OVS_TUNNEL_KEY_ATTR_TP_DST]        = { .len = sizeof(u16) },
 368         [OVS_TUNNEL_KEY_ATTR_OAM]           = { .len = 0 },
 369         [OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS]   = { .len = OVS_ATTR_VARIABLE },
 370         [OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS]    = { .len = OVS_ATTR_NESTED,
 371                                                 .next = ovs_vxlan_ext_key_lens },
 372         [OVS_TUNNEL_KEY_ATTR_IPV6_SRC]      = { .len = sizeof(struct in6_addr) },
 373         [OVS_TUNNEL_KEY_ATTR_IPV6_DST]      = { .len = sizeof(struct in6_addr) },
 374 };
 375
 376 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
 377 static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
 378         [OVS_KEY_ATTR_ENCAP]     = { .len = OVS_ATTR_NESTED },
 379         [OVS_KEY_ATTR_PRIORITY]  = { .len = sizeof(u32) },
 380         [OVS_KEY_ATTR_IN_PORT]   = { .len = sizeof(u32) },
 381         [OVS_KEY_ATTR_SKB_MARK]  = { .len = sizeof(u32) },
 382         [OVS_KEY_ATTR_ETHERNET]  = { .len = sizeof(struct ovs_key_ethernet) },
 383         [OVS_KEY_ATTR_VLAN]      = { .len = sizeof(__be16) },
 384         [OVS_KEY_ATTR_ETHERTYPE] = { .len = sizeof(__be16) },
 385         [OVS_KEY_ATTR_IPV4]      = { .len = sizeof(struct ovs_key_ipv4) },
 386         [OVS_KEY_ATTR_IPV6]      = { .len = sizeof(struct ovs_key_ipv6) },
 387         [OVS_KEY_ATTR_TCP]       = { .len = sizeof(struct ovs_key_tcp) },
 388         [OVS_KEY_ATTR_TCP_FLAGS] = { .len = sizeof(__be16) },
 389         [OVS_KEY_ATTR_UDP]       = { .len = sizeof(struct ovs_key_udp) },
 390         [OVS_KEY_ATTR_SCTP]      = { .len = sizeof(struct ovs_key_sctp) },
 391         [OVS_KEY_ATTR_ICMP]      = { .len = sizeof(struct ovs_key_icmp) },
 392         [OVS_KEY_ATTR_ICMPV6]    = { .len = sizeof(struct ovs_key_icmpv6) },
 393         [OVS_KEY_ATTR_ARP]       = { .len = sizeof(struct ovs_key_arp) },
 394         [OVS_KEY_ATTR_ND]        = { .len = sizeof(struct ovs_key_nd) },
 395         [OVS_KEY_ATTR_RECIRC_ID] = { .len = sizeof(u32) },
 396         [OVS_KEY_ATTR_DP_HASH]   = { .len = sizeof(u32) },
 397         [OVS_KEY_ATTR_TUNNEL]    = { .len = OVS_ATTR_NESTED,
 398                                      .next = ovs_tunnel_key_lens, },
 399         [OVS_KEY_ATTR_MPLS]      = { .len = sizeof(struct ovs_key_mpls) },
 400         [OVS_KEY_ATTR_CT_STATE]  = { .len = sizeof(u32) },
 401         [OVS_KEY_ATTR_CT_ZONE]   = { .len = sizeof(u16) },
 402         [OVS_KEY_ATTR_CT_MARK]   = { .len = sizeof(u32) },
 403         [OVS_KEY_ATTR_CT_LABELS] = { .len = sizeof(struct ovs_key_ct_labels) },
 404         [OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4] = {
 405                 .len = sizeof(struct ovs_key_ct_tuple_ipv4) },
 406         [OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6] = {
 407                 .len = sizeof(struct ovs_key_ct_tuple_ipv6) },
 408 };
 409
 410 static bool check_attr_len(unsigned int attr_len, unsigned int expected_len)
 411 {
 412         return expected_len == attr_len ||
 413                expected_len == OVS_ATTR_NESTED ||
 414                expected_len == OVS_ATTR_VARIABLE;
 415 }
 416
 417 static bool is_all_zero(const u8 *fp, size_t size)
 418 {
 419         int i;
 420
 421         if (!fp)
 422                 return false;
 423
 424         for (i = 0; i < size; i++)
 425                 if (fp[i])
 426                         return false;
 427
 428         return true;
 429 }
 430
 431 static int __parse_flow_nlattrs(const struct nlattr *attr,
 432                                 const struct nlattr *a[],
 433                                 u64 *attrsp, bool log, bool nz)
 434 {
 435         const struct nlattr *nla;
 436         u64 attrs;
 437         int rem;
 438
 439         attrs = *attrsp;
 440         nla_for_each_nested(nla, attr, rem) {
 441                 u16 type = nla_type(nla);
 442                 int expected_len;
 443
 444                 if (type > OVS_KEY_ATTR_MAX) {
 445                         OVS_NLERR(log, "Key type %d is out of range max %d",
 446                                   type, OVS_KEY_ATTR_MAX);
 447                         return -EINVAL;
 448                 }
 449
 450                 if (attrs & (1 << type)) {
 451                         OVS_NLERR(log, "Duplicate key (type %d).", type);
 452                         return -EINVAL;
 453                 }
 454
 455                 expected_len = ovs_key_lens[type].len;
 456                 if (!check_attr_len(nla_len(nla), expected_len)) {
 457                         OVS_NLERR(log, "Key %d has unexpected len %d expected %d",
 458                                   type, nla_len(nla), expected_len);
 459                         return -EINVAL;
 460                 }
 461
 462                 if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
 463                         attrs |= 1 << type;
 464                         a[type] = nla;
 465                 }
 466         }
 467         if (rem) {
 468                 OVS_NLERR(log, "Message has %d unknown bytes.", rem);
 469                 return -EINVAL;
 470         }
 471
 472         *attrsp = attrs;
 473         return 0;
 474 }
 475
 476 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
 477                                    const struct nlattr *a[], u64 *attrsp,
 478                                    bool log)
 479 {
 480         return __parse_flow_nlattrs(attr, a, attrsp, log, true);
 481 }
 482
 483 int parse_flow_nlattrs(const struct nlattr *attr, const struct nlattr *a[],
 484                        u64 *attrsp, bool log)
 485 {
 486         return __parse_flow_nlattrs(attr, a, attrsp, log, false);
 487 }
 488
 489 static int genev_tun_opt_from_nlattr(const struct nlattr *a,
 490                                      struct sw_flow_match *match, bool is_mask,
 491                                      bool log)
 492 {
 493         unsigned long opt_key_offset;
 494
 495         if (nla_len(a) > sizeof(match->key->tun_opts)) {
 496                 OVS_NLERR(log, "Geneve option length err (len %d, max %zu).",
 497                           nla_len(a), sizeof(match->key->tun_opts));
 498                 return -EINVAL;
 499         }
 500
 501         if (nla_len(a) % 4 != 0) {
 502                 OVS_NLERR(log, "Geneve opt len %d is not a multiple of 4.",
 503                           nla_len(a));
 504                 return -EINVAL;
 505         }
 506
 507         /* We need to record the length of the options passed
 508          * down, otherwise packets with the same format but
 509          * additional options will be silently matched.
 510          */
 511         if (!is_mask) {
 512                 SW_FLOW_KEY_PUT(match, tun_opts_len, nla_len(a),
 513                                 false);
 514         } else {
 515                 /* This is somewhat unusual because it looks at
 516                  * both the key and mask while parsing the
 517                  * attributes (and by extension assumes the key
 518                  * is parsed first). Normally, we would verify
 519                  * that each is the correct length and that the
 520                  * attributes line up in the validate function.
 521                  * However, that is difficult because this is
 522                  * variable length and we won't have the
 523                  * information later.
 524                  */
 525                 if (match->key->tun_opts_len != nla_len(a)) {
 526                         OVS_NLERR(log, "Geneve option len %d != mask len %d",
 527                                   match->key->tun_opts_len, nla_len(a));
 528                         return -EINVAL;
 529                 }
 530
 531                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
 532         }
 533
 534         opt_key_offset = TUN_METADATA_OFFSET(nla_len(a));
 535         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a),
 536                                   nla_len(a), is_mask);
 537         return 0;
 538 }
 539
 540 static int vxlan_tun_opt_from_nlattr(const struct nlattr *attr,
 541                                      struct sw_flow_match *match, bool is_mask,
 542                                      bool log)
 543 {
 544         struct nlattr *a;
 545         int rem;
 546         unsigned long opt_key_offset;
 547         struct vxlan_metadata opts;
 548
 549         BUILD_BUG_ON(sizeof(opts) > sizeof(match->key->tun_opts));
 550
 551         memset(&opts, 0, sizeof(opts));
 552         nla_for_each_nested(a, attr, rem) {
 553                 int type = nla_type(a);
 554
 555                 if (type > OVS_VXLAN_EXT_MAX) {
 556                         OVS_NLERR(log, "VXLAN extension %d out of range max %d",
 557                                   type, OVS_VXLAN_EXT_MAX);
 558                         return -EINVAL;
 559                 }
 560
 561                 if (!check_attr_len(nla_len(a),
 562                                     ovs_vxlan_ext_key_lens[type].len)) {
 563                         OVS_NLERR(log, "VXLAN extension %d has unexpected len %d expected %d",
 564                                   type, nla_len(a),
 565                                   ovs_vxlan_ext_key_lens[type].len);
 566                         return -EINVAL;
 567                 }
 568
 569                 switch (type) {
 570                 case OVS_VXLAN_EXT_GBP:
 571                         opts.gbp = nla_get_u32(a);
 572                         break;
 573                 default:
 574                         OVS_NLERR(log, "Unknown VXLAN extension attribute %d",
 575                                   type);
 576                         return -EINVAL;
 577                 }
 578         }
 579         if (rem) {
 580                 OVS_NLERR(log, "VXLAN extension message has %d unknown bytes.",
 581                           rem);
 582                 return -EINVAL;
 583         }
 584
 585         if (!is_mask)
 586                 SW_FLOW_KEY_PUT(match, tun_opts_len, sizeof(opts), false);
 587         else
 588                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
 589
 590         opt_key_offset = TUN_METADATA_OFFSET(sizeof(opts));
 591         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, &opts, sizeof(opts),
 592                                   is_mask);
 593         return 0;
 594 }
 595
 596 static int ip_tun_from_nlattr(const struct nlattr *attr,
 597                               struct sw_flow_match *match, bool is_mask,
 598                               bool log)
 599 {
 600         bool ttl = false, ipv4 = false, ipv6 = false;
 601         __be16 tun_flags = 0;
 602         int opts_type = 0;
 603         struct nlattr *a;
 604         int rem;
 605
 606         nla_for_each_nested(a, attr, rem) {
 607                 int type = nla_type(a);
 608                 int err;
 609
 610                 if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
 611                         OVS_NLERR(log, "Tunnel attr %d out of range max %d",
 612                                   type, OVS_TUNNEL_KEY_ATTR_MAX);
 613                         return -EINVAL;
 614                 }
 615
 616                 if (!check_attr_len(nla_len(a),
 617                                     ovs_tunnel_key_lens[type].len)) {
 618                         OVS_NLERR(log, "Tunnel attr %d has unexpected len %d expected %d",
 619                                   type, nla_len(a), ovs_tunnel_key_lens[type].len);
 620                         return -EINVAL;
 621                 }
 622
 623                 switch (type) {
 624                 case OVS_TUNNEL_KEY_ATTR_ID:
 625                         SW_FLOW_KEY_PUT(match, tun_key.tun_id,
 626                                         nla_get_be64(a), is_mask);
 627                         tun_flags |= TUNNEL_KEY;
 628                         break;
 629                 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
 630                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.src,
 631                                         nla_get_in_addr(a), is_mask);
 632                         ipv4 = true;
 633                         break;
 634                 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
 635                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.dst,
 636                                         nla_get_in_addr(a), is_mask);
 637                         ipv4 = true;
 638                         break;
 639                 case OVS_TUNNEL_KEY_ATTR_IPV6_SRC:
 640                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.src,
 641                                         nla_get_in6_addr(a), is_mask);
 642                         ipv6 = true;
 643                         break;
 644                 case OVS_TUNNEL_KEY_ATTR_IPV6_DST:
 645                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.dst,
 646                                         nla_get_in6_addr(a), is_mask);
 647                         ipv6 = true;
 648                         break;
 649                 case OVS_TUNNEL_KEY_ATTR_TOS:
 650                         SW_FLOW_KEY_PUT(match, tun_key.tos,
 651                                         nla_get_u8(a), is_mask);
 652                         break;
 653                 case OVS_TUNNEL_KEY_ATTR_TTL:
 654                         SW_FLOW_KEY_PUT(match, tun_key.ttl,
 655                                         nla_get_u8(a), is_mask);
 656                         ttl = true;
 657                         break;
 658                 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
 659                         tun_flags |= TUNNEL_DONT_FRAGMENT;
 660                         break;
 661                 case OVS_TUNNEL_KEY_ATTR_CSUM:
 662                         tun_flags |= TUNNEL_CSUM;
 663                         break;
 664                 case OVS_TUNNEL_KEY_ATTR_TP_SRC:
 665                         SW_FLOW_KEY_PUT(match, tun_key.tp_src,
 666                                         nla_get_be16(a), is_mask);
 667                         break;
 668                 case OVS_TUNNEL_KEY_ATTR_TP_DST:
 669                         SW_FLOW_KEY_PUT(match, tun_key.tp_dst,
 670                                         nla_get_be16(a), is_mask);
 671                         break;
 672                 case OVS_TUNNEL_KEY_ATTR_OAM:
 673                         tun_flags |= TUNNEL_OAM;
 674                         break;
 675                 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
 676                         if (opts_type) {
 677                                 OVS_NLERR(log, "Multiple metadata blocks provided");
 678                                 return -EINVAL;
 679                         }
 680
 681                         err = genev_tun_opt_from_nlattr(a, match, is_mask, log);
 682                         if (err)
 683                                 return err;
 684
 685                         tun_flags |= TUNNEL_GENEVE_OPT;
 686                         opts_type = type;
 687                         break;
 688                 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
 689                         if (opts_type) {
 690                                 OVS_NLERR(log, "Multiple metadata blocks provided");
 691                                 return -EINVAL;
 692                         }
 693
 694                         err = vxlan_tun_opt_from_nlattr(a, match, is_mask, log);
 695                         if (err)
 696                                 return err;
 697
 698                         tun_flags |= TUNNEL_VXLAN_OPT;
 699                         opts_type = type;
 700                         break;
 701                 case OVS_TUNNEL_KEY_ATTR_PAD:
 702                         break;
 703                 default:
 704                         OVS_NLERR(log, "Unknown IP tunnel attribute %d",
 705                                   type);
 706                         return -EINVAL;
 707                 }
 708         }
 709
 710         SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
 711         if (is_mask)
 712                 SW_FLOW_KEY_MEMSET_FIELD(match, tun_proto, 0xff, true);
 713         else
 714                 SW_FLOW_KEY_PUT(match, tun_proto, ipv6 ? AF_INET6 : AF_INET,
 715                                 false);
 716
 717         if (rem > 0) {
 718                 OVS_NLERR(log, "IP tunnel attribute has %d unknown bytes.",
 719                           rem);
 720                 return -EINVAL;
 721         }
 722
 723         if (ipv4 && ipv6) {
 724                 OVS_NLERR(log, "Mixed IPv4 and IPv6 tunnel attributes");
 725                 return -EINVAL;
 726         }
 727
 728         if (!is_mask) {
 729                 if (!ipv4 && !ipv6) {
 730                         OVS_NLERR(log, "IP tunnel dst address not specified");
 731                         return -EINVAL;
 732                 }
 733                 if (ipv4 && !match->key->tun_key.u.ipv4.dst) {
 734                         OVS_NLERR(log, "IPv4 tunnel dst address is zero");
 735                         return -EINVAL;
 736                 }
 737                 if (ipv6 && ipv6_addr_any(&match->key->tun_key.u.ipv6.dst)) {
 738                         OVS_NLERR(log, "IPv6 tunnel dst address is zero");
 739                         return -EINVAL;
 740                 }
 741
 742                 if (!ttl) {
 743                         OVS_NLERR(log, "IP tunnel TTL not specified.");
 744                         return -EINVAL;
 745                 }
 746         }
 747
 748         return opts_type;
 749 }
 750
 751 static int vxlan_opt_to_nlattr(struct sk_buff *skb,
 752                                const void *tun_opts, int swkey_tun_opts_len)
 753 {
 754         const struct vxlan_metadata *opts = tun_opts;
 755         struct nlattr *nla;
 756
 757         nla = nla_nest_start(skb, OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS);
 758         if (!nla)
 759                 return -EMSGSIZE;
 760
 761         if (nla_put_u32(skb, OVS_VXLAN_EXT_GBP, opts->gbp) < 0)
 762                 return -EMSGSIZE;
 763
 764         nla_nest_end(skb, nla);
 765         return 0;
 766 }
 767
 768 static int __ip_tun_to_nlattr(struct sk_buff *skb,
 769                               const struct ip_tunnel_key *output,
 770                               const void *tun_opts, int swkey_tun_opts_len,
 771                               unsigned short tun_proto)
 772 {
 773         if (output->tun_flags & TUNNEL_KEY &&
 774             nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id,
 775                          OVS_TUNNEL_KEY_ATTR_PAD))
 776                 return -EMSGSIZE;
 777         switch (tun_proto) {
 778         case AF_INET:
 779                 if (output->u.ipv4.src &&
 780                     nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC,
 781                                     output->u.ipv4.src))
 782                         return -EMSGSIZE;
 783                 if (output->u.ipv4.dst &&
 784                     nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST,
 785                                     output->u.ipv4.dst))
 786                         return -EMSGSIZE;
 787                 break;
 788         case AF_INET6:
 789                 if (!ipv6_addr_any(&output->u.ipv6.src) &&
 790                     nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_SRC,
 791                                      &output->u.ipv6.src))
 792                         return -EMSGSIZE;
 793                 if (!ipv6_addr_any(&output->u.ipv6.dst) &&
 794                     nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_DST,
 795                                      &output->u.ipv6.dst))
 796                         return -EMSGSIZE;
 797                 break;
 798         }
 799         if (output->tos &&
 800             nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->tos))
 801                 return -EMSGSIZE;
 802         if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ttl))
 803                 return -EMSGSIZE;
 804         if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
 805             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
 806                 return -EMSGSIZE;
 807         if ((output->tun_flags & TUNNEL_CSUM) &&
 808             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
 809                 return -EMSGSIZE;
 810         if (output->tp_src &&
 811             nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_SRC, output->tp_src))
 812                 return -EMSGSIZE;
 813         if (output->tp_dst &&
 814             nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_DST, output->tp_dst))
 815                 return -EMSGSIZE;
 816         if ((output->tun_flags & TUNNEL_OAM) &&
 817             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_OAM))
 818                 return -EMSGSIZE;
 819         if (swkey_tun_opts_len) {
 820                 if (output->tun_flags & TUNNEL_GENEVE_OPT &&
 821                     nla_put(skb, OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS,
 822                             swkey_tun_opts_len, tun_opts))
 823                         return -EMSGSIZE;
 824                 else if (output->tun_flags & TUNNEL_VXLAN_OPT &&
 825                          vxlan_opt_to_nlattr(skb, tun_opts, swkey_tun_opts_len))
 826                         return -EMSGSIZE;
 827         }
 828
 829         return 0;
 830 }
 831
 832 static int ip_tun_to_nlattr(struct sk_buff *skb,
 833                             const struct ip_tunnel_key *output,
 834                             const void *tun_opts, int swkey_tun_opts_len,
 835                             unsigned short tun_proto)
 836 {
 837         struct nlattr *nla;
 838         int err;
 839
 840         nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
 841         if (!nla)
 842                 return -EMSGSIZE;
 843
 844         err = __ip_tun_to_nlattr(skb, output, tun_opts, swkey_tun_opts_len,
 845                                  tun_proto);
 846         if (err)
 847                 return err;
 848
 849         nla_nest_end(skb, nla);
 850         return 0;
 851 }
 852
 853 int ovs_nla_put_tunnel_info(struct sk_buff *skb,
 854                             struct ip_tunnel_info *tun_info)
 855 {
 856         return __ip_tun_to_nlattr(skb, &tun_info->key,
 857                                   ip_tunnel_info_opts(tun_info),
 858                                   tun_info->options_len,
 859                                   ip_tunnel_info_af(tun_info));
 860 }
 861
 862 static int encode_vlan_from_nlattrs(struct sw_flow_match *match,
 863                                     const struct nlattr *a[],
 864                                     bool is_mask, bool inner)
 865 {
 866         __be16 tci = 0;
 867         __be16 tpid = 0;
 868
 869         if (a[OVS_KEY_ATTR_VLAN])
 870                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 871
 872         if (a[OVS_KEY_ATTR_ETHERTYPE])
 873                 tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 874
 875         if (likely(!inner)) {
 876                 SW_FLOW_KEY_PUT(match, eth.vlan.tpid, tpid, is_mask);
 877                 SW_FLOW_KEY_PUT(match, eth.vlan.tci, tci, is_mask);
 878         } else {
 879                 SW_FLOW_KEY_PUT(match, eth.cvlan.tpid, tpid, is_mask);
 880                 SW_FLOW_KEY_PUT(match, eth.cvlan.tci, tci, is_mask);
 881         }
 882         return 0;
 883 }
 884
 885 static int validate_vlan_from_nlattrs(const struct sw_flow_match *match,
 886                                       u64 key_attrs, bool inner,
 887                                       const struct nlattr **a, bool log)
 888 {
 889         __be16 tci = 0;
 890
 891         if (!((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) &&
 892               (key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
 893                eth_type_vlan(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE])))) {
 894                 /* Not a VLAN. */
 895                 return 0;
 896         }
 897
 898         if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
 899               (key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
 900                 OVS_NLERR(log, "Invalid %s frame", (inner) ? "C-VLAN" : "VLAN");
 901                 return -EINVAL;
 902         }
 903
 904         if (a[OVS_KEY_ATTR_VLAN])
 905                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 906
 907         if (!(tci & htons(VLAN_TAG_PRESENT))) {
 908                 if (tci) {
 909                         OVS_NLERR(log, "%s TCI does not have VLAN_TAG_PRESENT bit set.",
 910                                   (inner) ? "C-VLAN" : "VLAN");
 911                         return -EINVAL;
 912                 } else if (nla_len(a[OVS_KEY_ATTR_ENCAP])) {
 913                         /* Corner case for truncated VLAN header. */
 914                         OVS_NLERR(log, "Truncated %s header has non-zero encap attribute.",
 915                                   (inner) ? "C-VLAN" : "VLAN");
 916                         return -EINVAL;
 917                 }
 918         }
 919
 920         return 1;
 921 }
 922
 923 static int validate_vlan_mask_from_nlattrs(const struct sw_flow_match *match,
 924                                            u64 key_attrs, bool inner,
 925                                            const struct nlattr **a, bool log)
 926 {
 927         __be16 tci = 0;
 928         __be16 tpid = 0;
 929         bool encap_valid = !!(match->key->eth.vlan.tci &
 930                               htons(VLAN_TAG_PRESENT));
 931         bool i_encap_valid = !!(match->key->eth.cvlan.tci &
 932                                 htons(VLAN_TAG_PRESENT));
 933
 934         if (!(key_attrs & (1 << OVS_KEY_ATTR_ENCAP))) {
 935                 /* Not a VLAN. */
 936                 return 0;
 937         }
 938
 939         if ((!inner && !encap_valid) || (inner && !i_encap_valid)) {
 940                 OVS_NLERR(log, "Encap mask attribute is set for non-%s frame.",
 941                           (inner) ? "C-VLAN" : "VLAN");
 942                 return -EINVAL;
 943         }
 944
 945         if (a[OVS_KEY_ATTR_VLAN])
 946                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 947
 948         if (a[OVS_KEY_ATTR_ETHERTYPE])
 949                 tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 950
 951         if (tpid != htons(0xffff)) {
 952                 OVS_NLERR(log, "Must have an exact match on %s TPID (mask=%x).",
 953                           (inner) ? "C-VLAN" : "VLAN", ntohs(tpid));
 954                 return -EINVAL;
 955         }
 956         if (!(tci & htons(VLAN_TAG_PRESENT))) {
 957                 OVS_NLERR(log, "%s TCI mask does not have exact match for VLAN_TAG_PRESENT bit.",
 958                           (inner) ? "C-VLAN" : "VLAN");
 959                 return -EINVAL;
 960         }
 961
 962         return 1;
 963 }
 964
 965 static int __parse_vlan_from_nlattrs(struct sw_flow_match *match,
 966                                      u64 *key_attrs, bool inner,
 967                                      const struct nlattr **a, bool is_mask,
 968                                      bool log)
 969 {
 970         int err;
 971         const struct nlattr *encap;
 972
 973         if (!is_mask)
 974                 err = validate_vlan_from_nlattrs(match, *key_attrs, inner,
 975                                                  a, log);
 976         else
 977                 err = validate_vlan_mask_from_nlattrs(match, *key_attrs, inner,
 978                                                       a, log);
 979         if (err <= 0)
 980                 return err;
 981
 982         err = encode_vlan_from_nlattrs(match, a, is_mask, inner);
 983         if (err)
 984                 return err;
 985
 986         *key_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
 987         *key_attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
 988         *key_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
 989
 990         encap = a[OVS_KEY_ATTR_ENCAP];
 991
 992         if (!is_mask)
 993                 err = parse_flow_nlattrs(encap, a, key_attrs, log);
 994         else
 995                 err = parse_flow_mask_nlattrs(encap, a, key_attrs, log);
 996
 997         return err;
 998 }
 999
1000 static int parse_vlan_from_nlattrs(struct sw_flow_match *match,
1001                                    u64 *key_attrs, const struct nlattr **a,
1002                                    bool is_mask, bool log)
1003 {
1004         int err;
1005         bool encap_valid = false;
1006
1007         err = __parse_vlan_from_nlattrs(match, key_attrs, false, a,
1008                                         is_mask, log);
1009         if (err)
1010                 return err;
1011
1012         encap_valid = !!(match->key->eth.vlan.tci & htons(VLAN_TAG_PRESENT));
1013         if (encap_valid) {
1014                 err = __parse_vlan_from_nlattrs(match, key_attrs, true, a,
1015                                                 is_mask, log);
1016                 if (err)
1017                         return err;
1018         }
1019
1020         return 0;
1021 }
1022
1023 static int parse_eth_type_from_nlattrs(struct sw_flow_match *match,
1024                                        u64 *attrs, const struct nlattr **a,
1025                                        bool is_mask, bool log)
1026 {
1027         __be16 eth_type;
1028
1029         eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1030         if (is_mask) {
1031                 /* Always exact match EtherType. */
1032                 eth_type = htons(0xffff);
1033         } else if (!eth_proto_is_802_3(eth_type)) {
1034                 OVS_NLERR(log, "EtherType %x is less than min %x",
1035                                 ntohs(eth_type), ETH_P_802_3_MIN);
1036                 return -EINVAL;
1037         }
1038
1039         SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
1040         *attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
1041         return 0;
1042 }
1043
1044 static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
1045                                  u64 *attrs, const struct nlattr **a,
1046                                  bool is_mask, bool log)
1047 {
1048         u8 mac_proto = MAC_PROTO_ETHERNET;
1049
1050         if (*attrs & (1 << OVS_KEY_ATTR_DP_HASH)) {
1051                 u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]);
1052
1053                 SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask);
1054                 *attrs &= ~(1 << OVS_KEY_ATTR_DP_HASH);
1055         }
1056
1057         if (*attrs & (1 << OVS_KEY_ATTR_RECIRC_ID)) {
1058                 u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]);
1059
1060                 SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask);
1061                 *attrs &= ~(1 << OVS_KEY_ATTR_RECIRC_ID);
1062         }
1063
1064         if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
1065                 SW_FLOW_KEY_PUT(match, phy.priority,
1066                           nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
1067                 *attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY);
1068         }
1069
1070         if (*attrs & (1 << OVS_KEY_ATTR_IN_PORT)) {
1071                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
1072
1073                 if (is_mask) {
1074                         in_port = 0xffffffff; /* Always exact match in_port. */
1075                 } else if (in_port >= DP_MAX_PORTS) {
1076                         OVS_NLERR(log, "Port %d exceeds max allowable %d",
1077                                   in_port, DP_MAX_PORTS);
1078                         return -EINVAL;
1079                 }
1080
1081                 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
1082                 *attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT);
1083         } else if (!is_mask) {
1084                 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
1085         }
1086
1087         if (*attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) {
1088                 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
1089
1090                 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
1091                 *attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK);
1092         }
1093         if (*attrs & (1 << OVS_KEY_ATTR_TUNNEL)) {
1094                 if (ip_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
1095                                        is_mask, log) < 0)
1096                         return -EINVAL;
1097                 *attrs &= ~(1 << OVS_KEY_ATTR_TUNNEL);
1098         }
1099
1100         if (*attrs & (1 << OVS_KEY_ATTR_CT_STATE) &&
1101             ovs_ct_verify(net, OVS_KEY_ATTR_CT_STATE)) {
1102                 u32 ct_state = nla_get_u32(a[OVS_KEY_ATTR_CT_STATE]);
1103
1104                 if (ct_state & ~CT_SUPPORTED_MASK) {
1105                         OVS_NLERR(log, "ct_state flags %08x unsupported",
1106                                   ct_state);
1107                         return -EINVAL;
1108                 }
1109
1110                 SW_FLOW_KEY_PUT(match, ct_state, ct_state, is_mask);
1111                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_STATE);
1112         }
1113         if (*attrs & (1 << OVS_KEY_ATTR_CT_ZONE) &&
1114             ovs_ct_verify(net, OVS_KEY_ATTR_CT_ZONE)) {
1115                 u16 ct_zone = nla_get_u16(a[OVS_KEY_ATTR_CT_ZONE]);
1116
1117                 SW_FLOW_KEY_PUT(match, ct_zone, ct_zone, is_mask);
1118                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ZONE);
1119         }
1120         if (*attrs & (1 << OVS_KEY_ATTR_CT_MARK) &&
1121             ovs_ct_verify(net, OVS_KEY_ATTR_CT_MARK)) {
1122                 u32 mark = nla_get_u32(a[OVS_KEY_ATTR_CT_MARK]);
1123
1124                 SW_FLOW_KEY_PUT(match, ct.mark, mark, is_mask);
1125                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_MARK);
1126         }
1127         if (*attrs & (1 << OVS_KEY_ATTR_CT_LABELS) &&
1128             ovs_ct_verify(net, OVS_KEY_ATTR_CT_LABELS)) {
1129                 const struct ovs_key_ct_labels *cl;
1130
1131                 cl = nla_data(a[OVS_KEY_ATTR_CT_LABELS]);
1132                 SW_FLOW_KEY_MEMCPY(match, ct.labels, cl->ct_labels,
1133                                    sizeof(*cl), is_mask);
1134                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_LABELS);
1135         }
1136         if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4)) {
1137                 const struct ovs_key_ct_tuple_ipv4 *ct;
1138
1139                 ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4]);
1140
1141                 SW_FLOW_KEY_PUT(match, ipv4.ct_orig.src, ct->ipv4_src, is_mask);
1142                 SW_FLOW_KEY_PUT(match, ipv4.ct_orig.dst, ct->ipv4_dst, is_mask);
1143                 SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
1144                 SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
1145                 SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv4_proto, is_mask);
1146                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4);
1147         }
1148         if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)) {
1149                 const struct ovs_key_ct_tuple_ipv6 *ct;
1150
1151                 ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6]);
1152
1153                 SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.src, &ct->ipv6_src,
1154                                    sizeof(match->key->ipv6.ct_orig.src),
1155                                    is_mask);
1156                 SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.dst, &ct->ipv6_dst,
1157                                    sizeof(match->key->ipv6.ct_orig.dst),
1158                                    is_mask);
1159                 SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
1160                 SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
1161                 SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv6_proto, is_mask);
1162                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6);
1163         }
1164
1165         /* For layer 3 packets the Ethernet type is provided
1166          * and treated as metadata but no MAC addresses are provided.
1167          */
1168         if (!(*attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) &&
1169             (*attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)))
1170                 mac_proto = MAC_PROTO_NONE;
1171
1172         /* Always exact match mac_proto */
1173         SW_FLOW_KEY_PUT(match, mac_proto, is_mask ? 0xff : mac_proto, is_mask);
1174
1175         if (mac_proto == MAC_PROTO_NONE)
1176                 return parse_eth_type_from_nlattrs(match, attrs, a, is_mask,
1177                                                    log);
1178
1179         return 0;
1180 }
1181
1182 static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
1183                                 u64 attrs, const struct nlattr **a,
1184                                 bool is_mask, bool log)
1185 {
1186         int err;
1187
1188         err = metadata_from_nlattrs(net, match, &attrs, a, is_mask, log);
1189         if (err)
1190                 return err;
1191
1192         if (attrs & (1 << OVS_KEY_ATTR_ETHERNET)) {
1193                 const struct ovs_key_ethernet *eth_key;
1194
1195                 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
1196                 SW_FLOW_KEY_MEMCPY(match, eth.src,
1197                                 eth_key->eth_src, ETH_ALEN, is_mask);
1198                 SW_FLOW_KEY_MEMCPY(match, eth.dst,
1199                                 eth_key->eth_dst, ETH_ALEN, is_mask);
1200                 attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET);
1201
1202                 if (attrs & (1 << OVS_KEY_ATTR_VLAN)) {
1203                         /* VLAN attribute is always parsed before getting here since it
1204                          * may occur multiple times.
1205                          */
1206                         OVS_NLERR(log, "VLAN attribute unexpected.");
1207                         return -EINVAL;
1208                 }
1209
1210                 if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
1211                         err = parse_eth_type_from_nlattrs(match, &attrs, a, is_mask,
1212                                                           log);
1213                         if (err)
1214                                 return err;
1215                 } else if (!is_mask) {
1216                         SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
1217                 }
1218         } else if (!match->key->eth.type) {
1219                 OVS_NLERR(log, "Either Ethernet header or EtherType is required.");
1220                 return -EINVAL;
1221         }
1222
1223         if (attrs & (1 << OVS_KEY_ATTR_IPV4)) {
1224                 const struct ovs_key_ipv4 *ipv4_key;
1225
1226                 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
1227                 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
1228                         OVS_NLERR(log, "IPv4 frag type %d is out of range max %d",
1229                                   ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
1230                         return -EINVAL;
1231                 }
1232                 SW_FLOW_KEY_PUT(match, ip.proto,
1233                                 ipv4_key->ipv4_proto, is_mask);
1234                 SW_FLOW_KEY_PUT(match, ip.tos,
1235                                 ipv4_key->ipv4_tos, is_mask);
1236                 SW_FLOW_KEY_PUT(match, ip.ttl,
1237                                 ipv4_key->ipv4_ttl, is_mask);
1238                 SW_FLOW_KEY_PUT(match, ip.frag,
1239                                 ipv4_key->ipv4_frag, is_mask);
1240                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
1241                                 ipv4_key->ipv4_src, is_mask);
1242                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
1243                                 ipv4_key->ipv4_dst, is_mask);
1244                 attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
1245         }
1246
1247         if (attrs & (1 << OVS_KEY_ATTR_IPV6)) {
1248                 const struct ovs_key_ipv6 *ipv6_key;
1249
1250                 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
1251                 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
1252                         OVS_NLERR(log, "IPv6 frag type %d is out of range max %d",
1253                                   ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
1254                         return -EINVAL;
1255                 }
1256
1257                 if (!is_mask && ipv6_key->ipv6_label & htonl(0xFFF00000)) {
1258                         OVS_NLERR(log, "IPv6 flow label %x is out of range (max=%x).\n",
1259                                   ntohl(ipv6_key->ipv6_label), (1 << 20) - 1);
1260                         return -EINVAL;
1261                 }
1262
1263                 SW_FLOW_KEY_PUT(match, ipv6.label,
1264                                 ipv6_key->ipv6_label, is_mask);
1265                 SW_FLOW_KEY_PUT(match, ip.proto,
1266                                 ipv6_key->ipv6_proto, is_mask);
1267                 SW_FLOW_KEY_PUT(match, ip.tos,
1268                                 ipv6_key->ipv6_tclass, is_mask);
1269                 SW_FLOW_KEY_PUT(match, ip.ttl,
1270                                 ipv6_key->ipv6_hlimit, is_mask);
1271                 SW_FLOW_KEY_PUT(match, ip.frag,
1272                                 ipv6_key->ipv6_frag, is_mask);
1273                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
1274                                 ipv6_key->ipv6_src,
1275                                 sizeof(match->key->ipv6.addr.src),
1276                                 is_mask);
1277                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
1278                                 ipv6_key->ipv6_dst,
1279                                 sizeof(match->key->ipv6.addr.dst),
1280                                 is_mask);
1281
1282                 attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
1283         }
1284
1285         if (attrs & (1 << OVS_KEY_ATTR_ARP)) {
1286                 const struct ovs_key_arp *arp_key;
1287
1288                 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
1289                 if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
1290                         OVS_NLERR(log, "Unknown ARP opcode (opcode=%d).",
1291                                   arp_key->arp_op);
1292                         return -EINVAL;
1293                 }
1294
1295                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
1296                                 arp_key->arp_sip, is_mask);
1297                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
1298                         arp_key->arp_tip, is_mask);
1299                 SW_FLOW_KEY_PUT(match, ip.proto,
1300                                 ntohs(arp_key->arp_op), is_mask);
1301                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
1302                                 arp_key->arp_sha, ETH_ALEN, is_mask);
1303                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
1304                                 arp_key->arp_tha, ETH_ALEN, is_mask);
1305
1306                 attrs &= ~(1 << OVS_KEY_ATTR_ARP);
1307         }
1308
1309         if (attrs & (1 << OVS_KEY_ATTR_MPLS)) {
1310                 const struct ovs_key_mpls *mpls_key;
1311
1312                 mpls_key = nla_data(a[OVS_KEY_ATTR_MPLS]);
1313                 SW_FLOW_KEY_PUT(match, mpls.top_lse,
1314                                 mpls_key->mpls_lse, is_mask);
1315
1316                 attrs &= ~(1 << OVS_KEY_ATTR_MPLS);
1317          }
1318
1319         if (attrs & (1 << OVS_KEY_ATTR_TCP)) {
1320                 const struct ovs_key_tcp *tcp_key;
1321
1322                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
1323                 SW_FLOW_KEY_PUT(match, tp.src, tcp_key->tcp_src, is_mask);
1324                 SW_FLOW_KEY_PUT(match, tp.dst, tcp_key->tcp_dst, is_mask);
1325                 attrs &= ~(1 << OVS_KEY_ATTR_TCP);
1326         }
1327
1328         if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) {
1329                 SW_FLOW_KEY_PUT(match, tp.flags,
1330                                 nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
1331                                 is_mask);
1332                 attrs &= ~(1 << OVS_KEY_ATTR_TCP_FLAGS);
1333         }
1334
1335         if (attrs & (1 << OVS_KEY_ATTR_UDP)) {
1336                 const struct ovs_key_udp *udp_key;
1337
1338                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
1339                 SW_FLOW_KEY_PUT(match, tp.src, udp_key->udp_src, is_mask);
1340                 SW_FLOW_KEY_PUT(match, tp.dst, udp_key->udp_dst, is_mask);
1341                 attrs &= ~(1 << OVS_KEY_ATTR_UDP);
1342         }
1343
1344         if (attrs & (1 << OVS_KEY_ATTR_SCTP)) {
1345                 const struct ovs_key_sctp *sctp_key;
1346
1347                 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
1348                 SW_FLOW_KEY_PUT(match, tp.src, sctp_key->sctp_src, is_mask);
1349                 SW_FLOW_KEY_PUT(match, tp.dst, sctp_key->sctp_dst, is_mask);
1350                 attrs &= ~(1 << OVS_KEY_ATTR_SCTP);
1351         }
1352
1353         if (attrs & (1 << OVS_KEY_ATTR_ICMP)) {
1354                 const struct ovs_key_icmp *icmp_key;
1355
1356                 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
1357                 SW_FLOW_KEY_PUT(match, tp.src,
1358                                 htons(icmp_key->icmp_type), is_mask);
1359                 SW_FLOW_KEY_PUT(match, tp.dst,
1360                                 htons(icmp_key->icmp_code), is_mask);
1361                 attrs &= ~(1 << OVS_KEY_ATTR_ICMP);
1362         }
1363
1364         if (attrs & (1 << OVS_KEY_ATTR_ICMPV6)) {
1365                 const struct ovs_key_icmpv6 *icmpv6_key;
1366
1367                 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
1368                 SW_FLOW_KEY_PUT(match, tp.src,
1369                                 htons(icmpv6_key->icmpv6_type), is_mask);
1370                 SW_FLOW_KEY_PUT(match, tp.dst,
1371                                 htons(icmpv6_key->icmpv6_code), is_mask);
1372                 attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6);
1373         }
1374
1375         if (attrs & (1 << OVS_KEY_ATTR_ND)) {
1376                 const struct ovs_key_nd *nd_key;
1377
1378                 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
1379                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
1380                         nd_key->nd_target,
1381                         sizeof(match->key->ipv6.nd.target),
1382                         is_mask);
1383                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
1384                         nd_key->nd_sll, ETH_ALEN, is_mask);
1385                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
1386                                 nd_key->nd_tll, ETH_ALEN, is_mask);
1387                 attrs &= ~(1 << OVS_KEY_ATTR_ND);
1388         }
1389
1390         if (attrs != 0) {
1391                 OVS_NLERR(log, "Unknown key attributes %llx",
1392                           (unsigned long long)attrs);
1393                 return -EINVAL;
1394         }
1395
1396         return 0;
1397 }
1398
1399 static void nlattr_set(struct nlattr *attr, u8 val,
1400                        const struct ovs_len_tbl *tbl)
1401 {
1402         struct nlattr *nla;
1403         int rem;
1404
1405         /* The nlattr stream should already have been validated */
1406         nla_for_each_nested(nla, attr, rem) {
1407                 if (tbl[nla_type(nla)].len == OVS_ATTR_NESTED) {
1408                         if (tbl[nla_type(nla)].next)
1409                                 tbl = tbl[nla_type(nla)].next;
1410                         nlattr_set(nla, val, tbl);
1411                 } else {
1412                         memset(nla_data(nla), val, nla_len(nla));
1413                 }
1414
1415                 if (nla_type(nla) == OVS_KEY_ATTR_CT_STATE)
1416                         *(u32 *)nla_data(nla) &= CT_SUPPORTED_MASK;
1417         }
1418 }
1419
1420 static void mask_set_nlattr(struct nlattr *attr, u8 val)
1421 {
1422         nlattr_set(attr, val, ovs_key_lens);
1423 }
1424
1425 /**
1426  * ovs_nla_get_match - parses Netlink attributes into a flow key and
1427  * mask. In case the 'mask' is NULL, the flow is treated as exact match
1428  * flow. Otherwise, it is treated as a wildcarded flow, except the mask
1429  * does not include any don't care bit.
1430  * @net: Used to determine per-namespace field support.
1431  * @match: receives the extracted flow match information.
1432  * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1433  * sequence. The fields should of the packet that triggered the creation
1434  * of this flow.
1435  * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
1436  * attribute specifies the mask field of the wildcarded flow.
1437  * @log: Boolean to allow kernel error logging.  Normally true, but when
1438  * probing for feature compatibility this should be passed in as false to
1439  * suppress unnecessary error logging.
1440  */
1441 int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
1442                       const struct nlattr *nla_key,
1443                       const struct nlattr *nla_mask,
1444                       bool log)
1445 {
1446         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1447         struct nlattr *newmask = NULL;
1448         u64 key_attrs = 0;
1449         u64 mask_attrs = 0;
1450         int err;
1451
1452         err = parse_flow_nlattrs(nla_key, a, &key_attrs, log);
1453         if (err)
1454                 return err;
1455
1456         err = parse_vlan_from_nlattrs(match, &key_attrs, a, false, log);
1457         if (err)
1458                 return err;
1459
1460         err = ovs_key_from_nlattrs(net, match, key_attrs, a, false, log);
1461         if (err)
1462                 return err;
1463
1464         if (match->mask) {
1465                 if (!nla_mask) {
1466                         /* Create an exact match mask. We need to set to 0xff
1467                          * all the 'match->mask' fields that have been touched
1468                          * in 'match->key'. We cannot simply memset
1469                          * 'match->mask', because padding bytes and fields not
1470                          * specified in 'match->key' should be left to 0.
1471                          * Instead, we use a stream of netlink attributes,
1472                          * copied from 'key' and set to 0xff.
1473                          * ovs_key_from_nlattrs() will take care of filling
1474                          * 'match->mask' appropriately.
1475                          */
1476                         newmask = kmemdup(nla_key,
1477                                           nla_total_size(nla_len(nla_key)),
1478                                           GFP_KERNEL);
1479                         if (!newmask)
1480                                 return -ENOMEM;
1481
1482                         mask_set_nlattr(newmask, 0xff);
1483
1484                         /* The userspace does not send tunnel attributes that
1485                          * are 0, but we should not wildcard them nonetheless.
1486                          */
1487                         if (match->key->tun_proto)
1488                                 SW_FLOW_KEY_MEMSET_FIELD(match, tun_key,
1489                                                          0xff, true);
1490
1491                         nla_mask = newmask;
1492                 }
1493
1494                 err = parse_flow_mask_nlattrs(nla_mask, a, &mask_attrs, log);
1495                 if (err)
1496                         goto free_newmask;
1497
1498                 /* Always match on tci. */
1499                 SW_FLOW_KEY_PUT(match, eth.vlan.tci, htons(0xffff), true);
1500                 SW_FLOW_KEY_PUT(match, eth.cvlan.tci, htons(0xffff), true);
1501
1502                 err = parse_vlan_from_nlattrs(match, &mask_attrs, a, true, log);
1503                 if (err)
1504                         goto free_newmask;
1505
1506                 err = ovs_key_from_nlattrs(net, match, mask_attrs, a, true,
1507                                            log);
1508                 if (err)
1509                         goto free_newmask;
1510         }
1511
1512         if (!match_validate(match, key_attrs, mask_attrs, log))
1513                 err = -EINVAL;
1514
1515 free_newmask:
1516         kfree(newmask);
1517         return err;
1518 }
1519
1520 static size_t get_ufid_len(const struct nlattr *attr, bool log)
1521 {
1522         size_t len;
1523
1524         if (!attr)
1525                 return 0;
1526
1527         len = nla_len(attr);
1528         if (len < 1 || len > MAX_UFID_LENGTH) {
1529                 OVS_NLERR(log, "ufid size %u bytes exceeds the range (1, %d)",
1530                           nla_len(attr), MAX_UFID_LENGTH);
1531                 return 0;
1532         }
1533
1534         return len;
1535 }
1536
1537 /* Initializes 'flow->ufid', returning true if 'attr' contains a valid UFID,
1538  * or false otherwise.
1539  */
1540 bool ovs_nla_get_ufid(struct sw_flow_id *sfid, const struct nlattr *attr,
1541                       bool log)
1542 {
1543         sfid->ufid_len = get_ufid_len(attr, log);
1544         if (sfid->ufid_len)
1545                 memcpy(sfid->ufid, nla_data(attr), sfid->ufid_len);
1546
1547         return sfid->ufid_len;
1548 }
1549
1550 int ovs_nla_get_identifier(struct sw_flow_id *sfid, const struct nlattr *ufid,
1551                            const struct sw_flow_key *key, bool log)
1552 {
1553         struct sw_flow_key *new_key;
1554
1555         if (ovs_nla_get_ufid(sfid, ufid, log))
1556                 return 0;
1557
1558         /* If UFID was not provided, use unmasked key. */
1559         new_key = kmalloc(sizeof(*new_key), GFP_KERNEL);
1560         if (!new_key)
1561                 return -ENOMEM;
1562         memcpy(new_key, key, sizeof(*key));
1563         sfid->unmasked_key = new_key;
1564
1565         return 0;
1566 }
1567
1568 u32 ovs_nla_get_ufid_flags(const struct nlattr *attr)
1569 {
1570         return attr ? nla_get_u32(attr) : 0;
1571 }
1572
1573 /**
1574  * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
1575  * @net: Network namespace.
1576  * @key: Receives extracted in_port, priority, tun_key, skb_mark and conntrack
1577  * metadata.
1578  * @a: Array of netlink attributes holding parsed %OVS_KEY_ATTR_* Netlink
1579  * attributes.
1580  * @attrs: Bit mask for the netlink attributes included in @a.
1581  * @log: Boolean to allow kernel error logging.  Normally true, but when
1582  * probing for feature compatibility this should be passed in as false to
1583  * suppress unnecessary error logging.
1584  *
1585  * This parses a series of Netlink attributes that form a flow key, which must
1586  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
1587  * get the metadata, that is, the parts of the flow key that cannot be
1588  * extracted from the packet itself.
1589  *
1590  * This must be called before the packet key fields are filled in 'key'.
1591  */
1592
1593 int ovs_nla_get_flow_metadata(struct net *net,
1594                               const struct nlattr *a[OVS_KEY_ATTR_MAX + 1],
1595                               u64 attrs, struct sw_flow_key *key, bool log)
1596 {
1597         struct sw_flow_match match;
1598
1599         memset(&match, 0, sizeof(match));
1600         match.key = key;
1601
1602         key->ct_state = 0;
1603         key->ct_zone = 0;
1604         key->ct_orig_proto = 0;
1605         memset(&key->ct, 0, sizeof(key->ct));
1606         memset(&key->ipv4.ct_orig, 0, sizeof(key->ipv4.ct_orig));
1607         memset(&key->ipv6.ct_orig, 0, sizeof(key->ipv6.ct_orig));
1608
1609         key->phy.in_port = DP_MAX_PORTS;
1610
1611         return metadata_from_nlattrs(net, &match, &attrs, a, false, log);
1612 }
1613
1614 static int ovs_nla_put_vlan(struct sk_buff *skb, const struct vlan_head *vh,
1615                             bool is_mask)
1616 {
1617         __be16 eth_type = !is_mask ? vh->tpid : htons(0xffff);
1618
1619         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
1620             nla_put_be16(skb, OVS_KEY_ATTR_VLAN, vh->tci))
1621                 return -EMSGSIZE;
1622         return 0;
1623 }
1624
1625 static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
1626                              const struct sw_flow_key *output, bool is_mask,
1627                              struct sk_buff *skb)
1628 {
1629         struct ovs_key_ethernet *eth_key;
1630         struct nlattr *nla;
1631         struct nlattr *encap = NULL;
1632         struct nlattr *in_encap = NULL;
1633
1634         if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id))
1635                 goto nla_put_failure;
1636
1637         if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash))
1638                 goto nla_put_failure;
1639
1640         if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
1641                 goto nla_put_failure;
1642
1643         if ((swkey->tun_proto || is_mask)) {
1644                 const void *opts = NULL;
1645
1646                 if (output->tun_key.tun_flags & TUNNEL_OPTIONS_PRESENT)
1647                         opts = TUN_METADATA_OPTS(output, swkey->tun_opts_len);
1648
1649                 if (ip_tun_to_nlattr(skb, &output->tun_key, opts,
1650                                      swkey->tun_opts_len, swkey->tun_proto))
1651                         goto nla_put_failure;
1652         }
1653
1654         if (swkey->phy.in_port == DP_MAX_PORTS) {
1655                 if (is_mask && (output->phy.in_port == 0xffff))
1656                         if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
1657                                 goto nla_put_failure;
1658         } else {
1659                 u16 upper_u16;
1660                 upper_u16 = !is_mask ? 0 : 0xffff;
1661
1662                 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
1663                                 (upper_u16 << 16) | output->phy.in_port))
1664                         goto nla_put_failure;
1665         }
1666
1667         if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
1668                 goto nla_put_failure;
1669
1670         if (ovs_ct_put_key(swkey, output, skb))
1671                 goto nla_put_failure;
1672
1673         if (ovs_key_mac_proto(swkey) == MAC_PROTO_ETHERNET) {
1674                 nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
1675                 if (!nla)
1676                         goto nla_put_failure;
1677
1678                 eth_key = nla_data(nla);
1679                 ether_addr_copy(eth_key->eth_src, output->eth.src);
1680                 ether_addr_copy(eth_key->eth_dst, output->eth.dst);
1681
1682                 if (swkey->eth.vlan.tci || eth_type_vlan(swkey->eth.type)) {
1683                         if (ovs_nla_put_vlan(skb, &output->eth.vlan, is_mask))
1684                                 goto nla_put_failure;
1685                         encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
1686                         if (!swkey->eth.vlan.tci)
1687                                 goto unencap;
1688
1689                         if (swkey->eth.cvlan.tci || eth_type_vlan(swkey->eth.type)) {
1690                                 if (ovs_nla_put_vlan(skb, &output->eth.cvlan, is_mask))
1691                                         goto nla_put_failure;
1692                                 in_encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
1693                                 if (!swkey->eth.cvlan.tci)
1694                                         goto unencap;
1695                         }
1696                 }
1697
1698                 if (swkey->eth.type == htons(ETH_P_802_2)) {
1699                         /*
1700                         * Ethertype 802.2 is represented in the netlink with omitted
1701                         * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
1702                         * 0xffff in the mask attribute.  Ethertype can also
1703                         * be wildcarded.
1704                         */
1705                         if (is_mask && output->eth.type)
1706                                 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
1707                                                         output->eth.type))
1708                                         goto nla_put_failure;
1709                         goto unencap;
1710                 }
1711         }
1712
1713         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
1714                 goto nla_put_failure;
1715
1716         if (eth_type_vlan(swkey->eth.type)) {
1717                 /* There are 3 VLAN tags, we don't know anything about the rest
1718                  * of the packet, so truncate here.
1719                  */
1720                 WARN_ON_ONCE(!(encap && in_encap));
1721                 goto unencap;
1722         }
1723
1724         if (swkey->eth.type == htons(ETH_P_IP)) {
1725                 struct ovs_key_ipv4 *ipv4_key;
1726
1727                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
1728                 if (!nla)
1729                         goto nla_put_failure;
1730                 ipv4_key = nla_data(nla);
1731                 ipv4_key->ipv4_src = output->ipv4.addr.src;
1732                 ipv4_key->ipv4_dst = output->ipv4.addr.dst;
1733                 ipv4_key->ipv4_proto = output->ip.proto;
1734                 ipv4_key->ipv4_tos = output->ip.tos;
1735                 ipv4_key->ipv4_ttl = output->ip.ttl;
1736                 ipv4_key->ipv4_frag = output->ip.frag;
1737         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1738                 struct ovs_key_ipv6 *ipv6_key;
1739
1740                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
1741                 if (!nla)
1742                         goto nla_put_failure;
1743                 ipv6_key = nla_data(nla);
1744                 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
1745                                 sizeof(ipv6_key->ipv6_src));
1746                 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
1747                                 sizeof(ipv6_key->ipv6_dst));
1748                 ipv6_key->ipv6_label = output->ipv6.label;
1749                 ipv6_key->ipv6_proto = output->ip.proto;
1750                 ipv6_key->ipv6_tclass = output->ip.tos;
1751                 ipv6_key->ipv6_hlimit = output->ip.ttl;
1752                 ipv6_key->ipv6_frag = output->ip.frag;
1753         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
1754                    swkey->eth.type == htons(ETH_P_RARP)) {
1755                 struct ovs_key_arp *arp_key;
1756
1757                 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
1758                 if (!nla)
1759                         goto nla_put_failure;
1760                 arp_key = nla_data(nla);
1761                 memset(arp_key, 0, sizeof(struct ovs_key_arp));
1762                 arp_key->arp_sip = output->ipv4.addr.src;
1763                 arp_key->arp_tip = output->ipv4.addr.dst;
1764                 arp_key->arp_op = htons(output->ip.proto);
1765                 ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha);
1766                 ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha);
1767         } else if (eth_p_mpls(swkey->eth.type)) {
1768                 struct ovs_key_mpls *mpls_key;
1769
1770                 nla = nla_reserve(skb, OVS_KEY_ATTR_MPLS, sizeof(*mpls_key));
1771                 if (!nla)
1772                         goto nla_put_failure;
1773                 mpls_key = nla_data(nla);
1774                 mpls_key->mpls_lse = output->mpls.top_lse;
1775         }
1776
1777         if ((swkey->eth.type == htons(ETH_P_IP) ||
1778              swkey->eth.type == htons(ETH_P_IPV6)) &&
1779              swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1780
1781                 if (swkey->ip.proto == IPPROTO_TCP) {
1782                         struct ovs_key_tcp *tcp_key;
1783
1784                         nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
1785                         if (!nla)
1786                                 goto nla_put_failure;
1787                         tcp_key = nla_data(nla);
1788                         tcp_key->tcp_src = output->tp.src;
1789                         tcp_key->tcp_dst = output->tp.dst;
1790                         if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
1791                                          output->tp.flags))
1792                                 goto nla_put_failure;
1793                 } else if (swkey->ip.proto == IPPROTO_UDP) {
1794                         struct ovs_key_udp *udp_key;
1795
1796                         nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
1797                         if (!nla)
1798                                 goto nla_put_failure;
1799                         udp_key = nla_data(nla);
1800                         udp_key->udp_src = output->tp.src;
1801                         udp_key->udp_dst = output->tp.dst;
1802                 } else if (swkey->ip.proto == IPPROTO_SCTP) {
1803                         struct ovs_key_sctp *sctp_key;
1804
1805                         nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
1806                         if (!nla)
1807                                 goto nla_put_failure;
1808                         sctp_key = nla_data(nla);
1809                         sctp_key->sctp_src = output->tp.src;
1810                         sctp_key->sctp_dst = output->tp.dst;
1811                 } else if (swkey->eth.type == htons(ETH_P_IP) &&
1812                            swkey->ip.proto == IPPROTO_ICMP) {
1813                         struct ovs_key_icmp *icmp_key;
1814
1815                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
1816                         if (!nla)
1817                                 goto nla_put_failure;
1818                         icmp_key = nla_data(nla);
1819                         icmp_key->icmp_type = ntohs(output->tp.src);
1820                         icmp_key->icmp_code = ntohs(output->tp.dst);
1821                 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
1822                            swkey->ip.proto == IPPROTO_ICMPV6) {
1823                         struct ovs_key_icmpv6 *icmpv6_key;
1824
1825                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
1826                                                 sizeof(*icmpv6_key));
1827                         if (!nla)
1828                                 goto nla_put_failure;
1829                         icmpv6_key = nla_data(nla);
1830                         icmpv6_key->icmpv6_type = ntohs(output->tp.src);
1831                         icmpv6_key->icmpv6_code = ntohs(output->tp.dst);
1832
1833                         if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
1834                             icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
1835                                 struct ovs_key_nd *nd_key;
1836
1837                                 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
1838                                 if (!nla)
1839                                         goto nla_put_failure;
1840                                 nd_key = nla_data(nla);
1841                                 memcpy(nd_key->nd_target, &output->ipv6.nd.target,
1842                                                         sizeof(nd_key->nd_target));
1843                                 ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll);
1844                                 ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll);
1845                         }
1846                 }
1847         }
1848
1849 unencap:
1850         if (in_encap)
1851                 nla_nest_end(skb, in_encap);
1852         if (encap)
1853                 nla_nest_end(skb, encap);
1854
1855         return 0;
1856
1857 nla_put_failure:
1858         return -EMSGSIZE;
1859 }
1860
1861 int ovs_nla_put_key(const struct sw_flow_key *swkey,
1862                     const struct sw_flow_key *output, int attr, bool is_mask,
1863                     struct sk_buff *skb)
1864 {
1865         int err;
1866         struct nlattr *nla;
1867
1868         nla = nla_nest_start(skb, attr);
1869         if (!nla)
1870                 return -EMSGSIZE;
1871         err = __ovs_nla_put_key(swkey, output, is_mask, skb);
1872         if (err)
1873                 return err;
1874         nla_nest_end(skb, nla);
1875
1876         return 0;
1877 }
1878
1879 /* Called with ovs_mutex or RCU read lock. */
1880 int ovs_nla_put_identifier(const struct sw_flow *flow, struct sk_buff *skb)
1881 {
1882         if (ovs_identifier_is_ufid(&flow->id))
1883                 return nla_put(skb, OVS_FLOW_ATTR_UFID, flow->id.ufid_len,
1884                                flow->id.ufid);
1885
1886         return ovs_nla_put_key(flow->id.unmasked_key, flow->id.unmasked_key,
1887                                OVS_FLOW_ATTR_KEY, false, skb);
1888 }
1889
1890 /* Called with ovs_mutex or RCU read lock. */
1891 int ovs_nla_put_masked_key(const struct sw_flow *flow, struct sk_buff *skb)
1892 {
1893         return ovs_nla_put_key(&flow->key, &flow->key,
1894                                 OVS_FLOW_ATTR_KEY, false, skb);
1895 }
1896
1897 /* Called with ovs_mutex or RCU read lock. */
1898 int ovs_nla_put_mask(const struct sw_flow *flow, struct sk_buff *skb)
1899 {
1900         return ovs_nla_put_key(&flow->key, &flow->mask->key,
1901                                 OVS_FLOW_ATTR_MASK, true, skb);
1902 }
1903
1904 #define MAX_ACTIONS_BUFSIZE     (32 * 1024)
1905
1906 static struct sw_flow_actions *nla_alloc_flow_actions(int size, bool log)
1907 {
1908         struct sw_flow_actions *sfa;
1909
1910         if (size > MAX_ACTIONS_BUFSIZE) {
1911                 OVS_NLERR(log, "Flow action size %u bytes exceeds max", size);
1912                 return ERR_PTR(-EINVAL);
1913         }
1914
1915         sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
1916         if (!sfa)
1917                 return ERR_PTR(-ENOMEM);
1918
1919         sfa->actions_len = 0;
1920         return sfa;
1921 }
1922
1923 static void ovs_nla_free_set_action(const struct nlattr *a)
1924 {
1925         const struct nlattr *ovs_key = nla_data(a);
1926         struct ovs_tunnel_info *ovs_tun;
1927
1928         switch (nla_type(ovs_key)) {
1929         case OVS_KEY_ATTR_TUNNEL_INFO:
1930                 ovs_tun = nla_data(ovs_key);
1931                 dst_release((struct dst_entry *)ovs_tun->tun_dst);
1932                 break;
1933         }
1934 }
1935
1936 void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
1937 {
1938         const struct nlattr *a;
1939         int rem;
1940
1941         if (!sf_acts)
1942                 return;
1943
1944         nla_for_each_attr(a, sf_acts->actions, sf_acts->actions_len, rem) {
1945                 switch (nla_type(a)) {
1946                 case OVS_ACTION_ATTR_SET:
1947                         ovs_nla_free_set_action(a);
1948                         break;
1949                 case OVS_ACTION_ATTR_CT:
1950                         ovs_ct_free_action(a);
1951                         break;
1952                 }
1953         }
1954
1955         kfree(sf_acts);
1956 }
1957
1958 static void __ovs_nla_free_flow_actions(struct rcu_head *head)
1959 {
1960         ovs_nla_free_flow_actions(container_of(head, struct sw_flow_actions, rcu));
1961 }
1962
1963 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
1964  * The caller must hold rcu_read_lock for this to be sensible. */
1965 void ovs_nla_free_flow_actions_rcu(struct sw_flow_actions *sf_acts)
1966 {
1967         call_rcu(&sf_acts->rcu, __ovs_nla_free_flow_actions);
1968 }
1969
1970 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
1971                                        int attr_len, bool log)
1972 {
1973
1974         struct sw_flow_actions *acts;
1975         int new_acts_size;
1976         int req_size = NLA_ALIGN(attr_len);
1977         int next_offset = offsetof(struct sw_flow_actions, actions) +
1978                                         (*sfa)->actions_len;
1979
1980         if (req_size <= (ksize(*sfa) - next_offset))
1981                 goto out;
1982
1983         new_acts_size = ksize(*sfa) * 2;
1984
1985         if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
1986                 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
1987                         return ERR_PTR(-EMSGSIZE);
1988                 new_acts_size = MAX_ACTIONS_BUFSIZE;
1989         }
1990
1991         acts = nla_alloc_flow_actions(new_acts_size, log);
1992         if (IS_ERR(acts))
1993                 return (void *)acts;
1994
1995         memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
1996         acts->actions_len = (*sfa)->actions_len;
1997         acts->orig_len = (*sfa)->orig_len;
1998         kfree(*sfa);
1999         *sfa = acts;
2000
2001 out:
2002         (*sfa)->actions_len += req_size;
2003         return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
2004 }
2005
2006 static struct nlattr *__add_action(struct sw_flow_actions **sfa,
2007                                    int attrtype, void *data, int len, bool log)
2008 {
2009         struct nlattr *a;
2010
2011         a = reserve_sfa_size(sfa, nla_attr_size(len), log);
2012         if (IS_ERR(a))
2013                 return a;
2014
2015         a->nla_type = attrtype;
2016         a->nla_len = nla_attr_size(len);
2017
2018         if (data)
2019                 memcpy(nla_data(a), data, len);
2020         memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
2021
2022         return a;
2023 }
2024
2025 int ovs_nla_add_action(struct sw_flow_actions **sfa, int attrtype, void *data,
2026                        int len, bool log)
2027 {
2028         struct nlattr *a;
2029
2030         a = __add_action(sfa, attrtype, data, len, log);
2031
2032         return PTR_ERR_OR_ZERO(a);
2033 }
2034
2035 static inline int add_nested_action_start(struct sw_flow_actions **sfa,
2036                                           int attrtype, bool log)
2037 {
2038         int used = (*sfa)->actions_len;
2039         int err;
2040
2041         err = ovs_nla_add_action(sfa, attrtype, NULL, 0, log);
2042         if (err)
2043                 return err;
2044
2045         return used;
2046 }
2047
2048 static inline void add_nested_action_end(struct sw_flow_actions *sfa,
2049                                          int st_offset)
2050 {
2051         struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
2052                                                                st_offset);
2053
2054         a->nla_len = sfa->actions_len - st_offset;
2055 }
2056
2057 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
2058                                   const struct sw_flow_key *key,
2059                                   struct sw_flow_actions **sfa,
2060                                   __be16 eth_type, __be16 vlan_tci, bool log);
2061
2062 static int validate_and_copy_sample(struct net *net, const struct nlattr *attr,
2063                                     const struct sw_flow_key *key,
2064                                     struct sw_flow_actions **sfa,
2065                                     __be16 eth_type, __be16 vlan_tci,
2066                                     bool log, bool last)
2067 {
2068         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
2069         const struct nlattr *probability, *actions;
2070         const struct nlattr *a;
2071         int rem, start, err;
2072         struct sample_arg arg;
2073
2074         memset(attrs, 0, sizeof(attrs));
2075         nla_for_each_nested(a, attr, rem) {
2076                 int type = nla_type(a);
2077                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
2078                         return -EINVAL;
2079                 attrs[type] = a;
2080         }
2081         if (rem)
2082                 return -EINVAL;
2083
2084         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
2085         if (!probability || nla_len(probability) != sizeof(u32))
2086                 return -EINVAL;
2087
2088         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
2089         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
2090                 return -EINVAL;
2091
2092         /* validation done, copy sample action. */
2093         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE, log);
2094         if (start < 0)
2095                 return start;
2096
2097         /* When both skb and flow may be changed, put the sample
2098          * into a deferred fifo. On the other hand, if only skb
2099          * may be modified, the actions can be executed in place.
2100          *
2101          * Do this analysis at the flow installation time.
2102          * Set 'clone_action->exec' to true if the actions can be
2103          * executed without being deferred.
2104          *
2105          * If the sample is the last action, it can always be excuted
2106          * rather than deferred.
2107          */
2108         arg.exec = last || !actions_may_change_flow(actions);
2109         arg.probability = nla_get_u32(probability);
2110
2111         err = ovs_nla_add_action(sfa, OVS_SAMPLE_ATTR_ARG, &arg, sizeof(arg),
2112                                  log);
2113         if (err)
2114                 return err;
2115
2116         err = __ovs_nla_copy_actions(net, actions, key, sfa,
2117                                      eth_type, vlan_tci, log);
2118
2119         if (err)
2120                 return err;
2121
2122         add_nested_action_end(*sfa, start);
2123
2124         return 0;
2125 }
2126
2127 void ovs_match_init(struct sw_flow_match *match,
2128                     struct sw_flow_key *key,
2129                     bool reset_key,
2130                     struct sw_flow_mask *mask)
2131 {
2132         memset(match, 0, sizeof(*match));
2133         match->key = key;
2134         match->mask = mask;
2135
2136         if (reset_key)
2137                 memset(key, 0, sizeof(*key));
2138
2139         if (mask) {
2140                 memset(&mask->key, 0, sizeof(mask->key));
2141                 mask->range.start = mask->range.end = 0;
2142         }
2143 }
2144
2145 static int validate_geneve_opts(struct sw_flow_key *key)
2146 {
2147         struct geneve_opt *option;
2148         int opts_len = key->tun_opts_len;
2149         bool crit_opt = false;
2150
2151         option = (struct geneve_opt *)TUN_METADATA_OPTS(key, key->tun_opts_len);
2152         while (opts_len > 0) {
2153                 int len;
2154
2155                 if (opts_len < sizeof(*option))
2156                         return -EINVAL;
2157
2158                 len = sizeof(*option) + option->length * 4;
2159                 if (len > opts_len)
2160                         return -EINVAL;
2161
2162                 crit_opt |= !!(option->type & GENEVE_CRIT_OPT_TYPE);
2163
2164                 option = (struct geneve_opt *)((u8 *)option + len);
2165                 opts_len -= len;
2166         };
2167
2168         key->tun_key.tun_flags |= crit_opt ? TUNNEL_CRIT_OPT : 0;
2169
2170         return 0;
2171 }
2172
2173 static int validate_and_copy_set_tun(const struct nlattr *attr,
2174                                      struct sw_flow_actions **sfa, bool log)
2175 {
2176         struct sw_flow_match match;
2177         struct sw_flow_key key;
2178         struct metadata_dst *tun_dst;
2179         struct ip_tunnel_info *tun_info;
2180         struct ovs_tunnel_info *ovs_tun;
2181         struct nlattr *a;
2182         int err = 0, start, opts_type;
2183
2184         ovs_match_init(&match, &key, true, NULL);
2185         opts_type = ip_tun_from_nlattr(nla_data(attr), &match, false, log);
2186         if (opts_type < 0)
2187                 return opts_type;
2188
2189         if (key.tun_opts_len) {
2190                 switch (opts_type) {
2191                 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
2192                         err = validate_geneve_opts(&key);
2193                         if (err < 0)
2194                                 return err;
2195                         break;
2196                 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
2197                         break;
2198                 }
2199         };
2200
2201         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET, log);
2202         if (start < 0)
2203                 return start;
2204
2205         tun_dst = metadata_dst_alloc(key.tun_opts_len, METADATA_IP_TUNNEL,
2206                                      GFP_KERNEL);
2207
2208         if (!tun_dst)
2209                 return -ENOMEM;
2210
2211         err = dst_cache_init(&tun_dst->u.tun_info.dst_cache, GFP_KERNEL);
2212         if (err) {
2213                 dst_release((struct dst_entry *)tun_dst);
2214                 return err;
2215         }
2216
2217         a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL,
2218                          sizeof(*ovs_tun), log);
2219         if (IS_ERR(a)) {
2220                 dst_release((struct dst_entry *)tun_dst);
2221                 return PTR_ERR(a);
2222         }
2223
2224         ovs_tun = nla_data(a);
2225         ovs_tun->tun_dst = tun_dst;
2226
2227         tun_info = &tun_dst->u.tun_info;
2228         tun_info->mode = IP_TUNNEL_INFO_TX;
2229         if (key.tun_proto == AF_INET6)
2230                 tun_info->mode |= IP_TUNNEL_INFO_IPV6;
2231         tun_info->key = key.tun_key;
2232
2233         /* We need to store the options in the action itself since
2234          * everything else will go away after flow setup. We can append
2235          * it to tun_info and then point there.
2236          */
2237         ip_tunnel_info_opts_set(tun_info,
2238                                 TUN_METADATA_OPTS(&key, key.tun_opts_len),
2239                                 key.tun_opts_len);
2240         add_nested_action_end(*sfa, start);
2241
2242         return err;
2243 }
2244
2245 /* Return false if there are any non-masked bits set.
2246  * Mask follows data immediately, before any netlink padding.
2247  */
2248 static bool validate_masked(u8 *data, int len)
2249 {
2250         u8 *mask = data + len;
2251
2252         while (len--)
2253                 if (*data++ & ~*mask++)
2254                         return false;
2255
2256         return true;
2257 }
2258
2259 static int validate_set(const struct nlattr *a,
2260                         const struct sw_flow_key *flow_key,
2261                         struct sw_flow_actions **sfa, bool *skip_copy,
2262                         u8 mac_proto, __be16 eth_type, bool masked, bool log)
2263 {
2264         const struct nlattr *ovs_key = nla_data(a);
2265         int key_type = nla_type(ovs_key);
2266         size_t key_len;
2267
2268         /* There can be only one key in a action */
2269         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
2270                 return -EINVAL;
2271
2272         key_len = nla_len(ovs_key);
2273         if (masked)
2274                 key_len /= 2;
2275
2276         if (key_type > OVS_KEY_ATTR_MAX ||
2277             !check_attr_len(key_len, ovs_key_lens[key_type].len))
2278                 return -EINVAL;
2279
2280         if (masked && !validate_masked(nla_data(ovs_key), key_len))
2281                 return -EINVAL;
2282
2283         switch (key_type) {
2284         const struct ovs_key_ipv4 *ipv4_key;
2285         const struct ovs_key_ipv6 *ipv6_key;
2286         int err;
2287
2288         case OVS_KEY_ATTR_PRIORITY:
2289         case OVS_KEY_ATTR_SKB_MARK:
2290         case OVS_KEY_ATTR_CT_MARK:
2291         case OVS_KEY_ATTR_CT_LABELS:
2292                 break;
2293
2294         case OVS_KEY_ATTR_ETHERNET:
2295                 if (mac_proto != MAC_PROTO_ETHERNET)
2296                         return -EINVAL;
2297                 break;
2298
2299         case OVS_KEY_ATTR_TUNNEL:
2300                 if (masked)
2301                         return -EINVAL; /* Masked tunnel set not supported. */
2302
2303                 *skip_copy = true;
2304                 err = validate_and_copy_set_tun(a, sfa, log);
2305                 if (err)
2306                         return err;
2307                 break;
2308
2309         case OVS_KEY_ATTR_IPV4:
2310                 if (eth_type != htons(ETH_P_IP))
2311                         return -EINVAL;
2312
2313                 ipv4_key = nla_data(ovs_key);
2314
2315                 if (masked) {
2316                         const struct ovs_key_ipv4 *mask = ipv4_key + 1;
2317
2318                         /* Non-writeable fields. */
2319                         if (mask->ipv4_proto || mask->ipv4_frag)
2320                                 return -EINVAL;
2321                 } else {
2322                         if (ipv4_key->ipv4_proto != flow_key->ip.proto)
2323                                 return -EINVAL;
2324
2325                         if (ipv4_key->ipv4_frag != flow_key->ip.frag)
2326                                 return -EINVAL;
2327                 }
2328                 break;
2329
2330         case OVS_KEY_ATTR_IPV6:
2331                 if (eth_type != htons(ETH_P_IPV6))
2332                         return -EINVAL;
2333
2334                 ipv6_key = nla_data(ovs_key);
2335
2336                 if (masked) {
2337                         const struct ovs_key_ipv6 *mask = ipv6_key + 1;
2338
2339                         /* Non-writeable fields. */
2340                         if (mask->ipv6_proto || mask->ipv6_frag)
2341                                 return -EINVAL;
2342
2343                         /* Invalid bits in the flow label mask? */
2344                         if (ntohl(mask->ipv6_label) & 0xFFF00000)
2345                                 return -EINVAL;
2346                 } else {
2347                         if (ipv6_key->ipv6_proto != flow_key->ip.proto)
2348                                 return -EINVAL;
2349
2350                         if (ipv6_key->ipv6_frag != flow_key->ip.frag)
2351                                 return -EINVAL;
2352                 }
2353                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
2354                         return -EINVAL;
2355
2356                 break;
2357
2358         case OVS_KEY_ATTR_TCP:
2359                 if ((eth_type != htons(ETH_P_IP) &&
2360                      eth_type != htons(ETH_P_IPV6)) ||
2361                     flow_key->ip.proto != IPPROTO_TCP)
2362                         return -EINVAL;
2363
2364                 break;
2365
2366         case OVS_KEY_ATTR_UDP:
2367                 if ((eth_type != htons(ETH_P_IP) &&
2368                      eth_type != htons(ETH_P_IPV6)) ||
2369                     flow_key->ip.proto != IPPROTO_UDP)
2370                         return -EINVAL;
2371
2372                 break;
2373
2374         case OVS_KEY_ATTR_MPLS:
2375                 if (!eth_p_mpls(eth_type))
2376                         return -EINVAL;
2377                 break;
2378
2379         case OVS_KEY_ATTR_SCTP:
2380                 if ((eth_type != htons(ETH_P_IP) &&
2381                      eth_type != htons(ETH_P_IPV6)) ||
2382                     flow_key->ip.proto != IPPROTO_SCTP)
2383                         return -EINVAL;
2384
2385                 break;
2386
2387         default:
2388                 return -EINVAL;
2389         }
2390
2391         /* Convert non-masked non-tunnel set actions to masked set actions. */
2392         if (!masked && key_type != OVS_KEY_ATTR_TUNNEL) {
2393                 int start, len = key_len * 2;
2394                 struct nlattr *at;
2395
2396                 *skip_copy = true;
2397
2398                 start = add_nested_action_start(sfa,
2399                                                 OVS_ACTION_ATTR_SET_TO_MASKED,
2400                                                 log);
2401                 if (start < 0)
2402                         return start;
2403
2404                 at = __add_action(sfa, key_type, NULL, len, log);
2405                 if (IS_ERR(at))
2406                         return PTR_ERR(at);
2407
2408                 memcpy(nla_data(at), nla_data(ovs_key), key_len); /* Key. */
2409                 memset(nla_data(at) + key_len, 0xff, key_len);    /* Mask. */
2410                 /* Clear non-writeable bits from otherwise writeable fields. */
2411                 if (key_type == OVS_KEY_ATTR_IPV6) {
2412                         struct ovs_key_ipv6 *mask = nla_data(at) + key_len;
2413
2414                         mask->ipv6_label &= htonl(0x000FFFFF);
2415                 }
2416                 add_nested_action_end(*sfa, start);
2417         }
2418
2419         return 0;
2420 }
2421
2422 static int validate_userspace(const struct nlattr *attr)
2423 {
2424         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
2425                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
2426                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
2427                 [OVS_USERSPACE_ATTR_EGRESS_TUN_PORT] = {.type = NLA_U32 },
2428         };
2429         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
2430         int error;
2431
2432         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, attr,
2433                                  userspace_policy, NULL);
2434         if (error)
2435                 return error;
2436
2437         if (!a[OVS_USERSPACE_ATTR_PID] ||
2438             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
2439                 return -EINVAL;
2440
2441         return 0;
2442 }
2443
2444 static int copy_action(const struct nlattr *from,
2445                        struct sw_flow_actions **sfa, bool log)
2446 {
2447         int totlen = NLA_ALIGN(from->nla_len);
2448         struct nlattr *to;
2449
2450         to = reserve_sfa_size(sfa, from->nla_len, log);
2451         if (IS_ERR(to))
2452                 return PTR_ERR(to);
2453
2454         memcpy(to, from, totlen);
2455         return 0;
2456 }
2457
2458 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
2459                                   const struct sw_flow_key *key,
2460                                   struct sw_flow_actions **sfa,
2461                                   __be16 eth_type, __be16 vlan_tci, bool log)
2462 {
2463         u8 mac_proto = ovs_key_mac_proto(key);
2464         const struct nlattr *a;
2465         int rem, err;
2466
2467         nla_for_each_nested(a, attr, rem) {
2468                 /* Expected argument lengths, (u32)-1 for variable length. */
2469                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
2470                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
2471                         [OVS_ACTION_ATTR_RECIRC] = sizeof(u32),
2472                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
2473                         [OVS_ACTION_ATTR_PUSH_MPLS] = sizeof(struct ovs_action_push_mpls),
2474                         [OVS_ACTION_ATTR_POP_MPLS] = sizeof(__be16),
2475                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
2476                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
2477                         [OVS_ACTION_ATTR_SET] = (u32)-1,
2478                         [OVS_ACTION_ATTR_SET_MASKED] = (u32)-1,
2479                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
2480                         [OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash),
2481                         [OVS_ACTION_ATTR_CT] = (u32)-1,
2482                         [OVS_ACTION_ATTR_TRUNC] = sizeof(struct ovs_action_trunc),
2483                         [OVS_ACTION_ATTR_PUSH_ETH] = sizeof(struct ovs_action_push_eth),
2484                         [OVS_ACTION_ATTR_POP_ETH] = 0,
2485                 };
2486                 const struct ovs_action_push_vlan *vlan;
2487                 int type = nla_type(a);
2488                 bool skip_copy;
2489
2490                 if (type > OVS_ACTION_ATTR_MAX ||
2491                     (action_lens[type] != nla_len(a) &&
2492                      action_lens[type] != (u32)-1))
2493                         return -EINVAL;
2494
2495                 skip_copy = false;
2496                 switch (type) {
2497                 case OVS_ACTION_ATTR_UNSPEC:
2498                         return -EINVAL;
2499
2500                 case OVS_ACTION_ATTR_USERSPACE:
2501                         err = validate_userspace(a);
2502                         if (err)
2503                                 return err;
2504                         break;
2505
2506                 case OVS_ACTION_ATTR_OUTPUT:
2507                         if (nla_get_u32(a) >= DP_MAX_PORTS)
2508                                 return -EINVAL;
2509                         break;
2510
2511                 case OVS_ACTION_ATTR_TRUNC: {
2512                         const struct ovs_action_trunc *trunc = nla_data(a);
2513
2514                         if (trunc->max_len < ETH_HLEN)
2515                                 return -EINVAL;
2516                         break;
2517                 }
2518
2519                 case OVS_ACTION_ATTR_HASH: {
2520                         const struct ovs_action_hash *act_hash = nla_data(a);
2521
2522                         switch (act_hash->hash_alg) {
2523                         case OVS_HASH_ALG_L4:
2524                                 break;
2525                         default:
2526                                 return  -EINVAL;
2527                         }
2528
2529                         break;
2530                 }
2531
2532                 case OVS_ACTION_ATTR_POP_VLAN:
2533                         if (mac_proto != MAC_PROTO_ETHERNET)
2534                                 return -EINVAL;
2535                         vlan_tci = htons(0);
2536                         break;
2537
2538                 case OVS_ACTION_ATTR_PUSH_VLAN:
2539                         if (mac_proto != MAC_PROTO_ETHERNET)
2540                                 return -EINVAL;
2541                         vlan = nla_data(a);
2542                         if (!eth_type_vlan(vlan->vlan_tpid))
2543                                 return -EINVAL;
2544                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
2545                                 return -EINVAL;
2546                         vlan_tci = vlan->vlan_tci;
2547                         break;
2548
2549                 case OVS_ACTION_ATTR_RECIRC:
2550                         break;
2551
2552                 case OVS_ACTION_ATTR_PUSH_MPLS: {
2553                         const struct ovs_action_push_mpls *mpls = nla_data(a);
2554
2555                         if (!eth_p_mpls(mpls->mpls_ethertype))
2556                                 return -EINVAL;
2557                         /* Prohibit push MPLS other than to a white list
2558                          * for packets that have a known tag order.
2559                          */
2560                         if (vlan_tci & htons(VLAN_TAG_PRESENT) ||
2561                             (eth_type != htons(ETH_P_IP) &&
2562                              eth_type != htons(ETH_P_IPV6) &&
2563                              eth_type != htons(ETH_P_ARP) &&
2564                              eth_type != htons(ETH_P_RARP) &&
2565                              !eth_p_mpls(eth_type)))
2566                                 return -EINVAL;
2567                         eth_type = mpls->mpls_ethertype;
2568                         break;
2569                 }
2570
2571                 case OVS_ACTION_ATTR_POP_MPLS:
2572                         if (vlan_tci & htons(VLAN_TAG_PRESENT) ||
2573                             !eth_p_mpls(eth_type))
2574                                 return -EINVAL;
2575
2576                         /* Disallow subsequent L2.5+ set and mpls_pop actions
2577                          * as there is no check here to ensure that the new
2578                          * eth_type is valid and thus set actions could
2579                          * write off the end of the packet or otherwise
2580                          * corrupt it.
2581                          *
2582                          * Support for these actions is planned using packet
2583                          * recirculation.
2584                          */
2585                         eth_type = htons(0);
2586                         break;
2587
2588                 case OVS_ACTION_ATTR_SET:
2589                         err = validate_set(a, key, sfa,
2590                                            &skip_copy, mac_proto, eth_type,
2591                                            false, log);
2592                         if (err)
2593                                 return err;
2594                         break;
2595
2596                 case OVS_ACTION_ATTR_SET_MASKED:
2597                         err = validate_set(a, key, sfa,
2598                                            &skip_copy, mac_proto, eth_type,
2599                                            true, log);
2600                         if (err)
2601                                 return err;
2602                         break;
2603
2604                 case OVS_ACTION_ATTR_SAMPLE: {
2605                         bool last = nla_is_last(a, rem);
2606
2607                         err = validate_and_copy_sample(net, a, key, sfa,
2608                                                        eth_type, vlan_tci,
2609                                                        log, last);
2610                         if (err)
2611                                 return err;
2612                         skip_copy = true;
2613                         break;
2614                 }
2615
2616                 case OVS_ACTION_ATTR_CT:
2617                         err = ovs_ct_copy_action(net, a, key, sfa, log);
2618                         if (err)
2619                                 return err;
2620                         skip_copy = true;
2621                         break;
2622
2623                 case OVS_ACTION_ATTR_PUSH_ETH:
2624                         /* Disallow pushing an Ethernet header if one
2625                          * is already present */
2626                         if (mac_proto != MAC_PROTO_NONE)
2627                                 return -EINVAL;
2628                         mac_proto = MAC_PROTO_NONE;
2629                         break;
2630
2631                 case OVS_ACTION_ATTR_POP_ETH:
2632                         if (mac_proto != MAC_PROTO_ETHERNET)
2633                                 return -EINVAL;
2634                         if (vlan_tci & htons(VLAN_TAG_PRESENT))
2635                                 return -EINVAL;
2636                         mac_proto = MAC_PROTO_ETHERNET;
2637                         break;
2638
2639                 default:
2640                         OVS_NLERR(log, "Unknown Action type %d", type);
2641                         return -EINVAL;
2642                 }
2643                 if (!skip_copy) {
2644                         err = copy_action(a, sfa, log);
2645                         if (err)
2646                                 return err;
2647                 }
2648         }
2649
2650         if (rem > 0)
2651                 return -EINVAL;
2652
2653         return 0;
2654 }
2655
2656 /* 'key' must be the masked key. */
2657 int ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
2658                          const struct sw_flow_key *key,
2659                          struct sw_flow_actions **sfa, bool log)
2660 {
2661         int err;
2662
2663         *sfa = nla_alloc_flow_actions(nla_len(attr), log);
2664         if (IS_ERR(*sfa))
2665                 return PTR_ERR(*sfa);
2666
2667         (*sfa)->orig_len = nla_len(attr);
2668         err = __ovs_nla_copy_actions(net, attr, key, sfa, key->eth.type,
2669                                      key->eth.vlan.tci, log);
2670         if (err)
2671                 ovs_nla_free_flow_actions(*sfa);
2672
2673         return err;
2674 }
2675
2676 static int sample_action_to_attr(const struct nlattr *attr,
2677                                  struct sk_buff *skb)
2678 {
2679         struct nlattr *start, *ac_start = NULL, *sample_arg;
2680         int err = 0, rem = nla_len(attr);
2681         const struct sample_arg *arg;
2682         struct nlattr *actions;
2683
2684         start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
2685         if (!start)
2686                 return -EMSGSIZE;
2687
2688         sample_arg = nla_data(attr);
2689         arg = nla_data(sample_arg);
2690         actions = nla_next(sample_arg, &rem);
2691
2692         if (nla_put_u32(skb, OVS_SAMPLE_ATTR_PROBABILITY, arg->probability)) {
2693                 err = -EMSGSIZE;
2694                 goto out;
2695         }
2696
2697         ac_start = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
2698         if (!ac_start) {
2699                 err = -EMSGSIZE;
2700                 goto out;
2701         }
2702
2703         err = ovs_nla_put_actions(actions, rem, skb);
2704
2705 out:
2706         if (err) {
2707                 nla_nest_cancel(skb, ac_start);
2708                 nla_nest_cancel(skb, start);
2709         } else {
2710                 nla_nest_end(skb, ac_start);
2711                 nla_nest_end(skb, start);
2712         }
2713
2714         return err;
2715 }
2716
2717 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
2718 {
2719         const struct nlattr *ovs_key = nla_data(a);
2720         int key_type = nla_type(ovs_key);
2721         struct nlattr *start;
2722         int err;
2723
2724         switch (key_type) {
2725         case OVS_KEY_ATTR_TUNNEL_INFO: {
2726                 struct ovs_tunnel_info *ovs_tun = nla_data(ovs_key);
2727                 struct ip_tunnel_info *tun_info = &ovs_tun->tun_dst->u.tun_info;
2728
2729                 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
2730                 if (!start)
2731                         return -EMSGSIZE;
2732
2733                 err =  ip_tun_to_nlattr(skb, &tun_info->key,
2734                                         ip_tunnel_info_opts(tun_info),
2735                                         tun_info->options_len,
2736                                         ip_tunnel_info_af(tun_info));
2737                 if (err)
2738                         return err;
2739                 nla_nest_end(skb, start);
2740                 break;
2741         }
2742         default:
2743                 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
2744                         return -EMSGSIZE;
2745                 break;
2746         }
2747
2748         return 0;
2749 }
2750
2751 static int masked_set_action_to_set_action_attr(const struct nlattr *a,
2752                                                 struct sk_buff *skb)
2753 {
2754         const struct nlattr *ovs_key = nla_data(a);
2755         struct nlattr *nla;
2756         size_t key_len = nla_len(ovs_key) / 2;
2757
2758         /* Revert the conversion we did from a non-masked set action to
2759          * masked set action.
2760          */
2761         nla = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
2762         if (!nla)
2763                 return -EMSGSIZE;
2764
2765         if (nla_put(skb, nla_type(ovs_key), key_len, nla_data(ovs_key)))
2766                 return -EMSGSIZE;
2767
2768         nla_nest_end(skb, nla);
2769         return 0;
2770 }
2771
2772 int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
2773 {
2774         const struct nlattr *a;
2775         int rem, err;
2776
2777         nla_for_each_attr(a, attr, len, rem) {
2778                 int type = nla_type(a);
2779
2780                 switch (type) {
2781                 case OVS_ACTION_ATTR_SET:
2782                         err = set_action_to_attr(a, skb);
2783                         if (err)
2784                                 return err;
2785                         break;
2786
2787                 case OVS_ACTION_ATTR_SET_TO_MASKED:
2788                         err = masked_set_action_to_set_action_attr(a, skb);
2789                         if (err)
2790                                 return err;
2791                         break;
2792
2793                 case OVS_ACTION_ATTR_SAMPLE:
2794                         err = sample_action_to_attr(a, skb);
2795                         if (err)
2796                                 return err;
2797                         break;
2798
2799                 case OVS_ACTION_ATTR_CT:
2800                         err = ovs_ct_action_to_attr(nla_data(a), skb);
2801                         if (err)
2802                                 return err;
2803                         break;
2804
2805                 default:
2806                         if (nla_put(skb, type, nla_len(a), nla_data(a)))
2807                                 return -EMSGSIZE;
2808                         break;
2809                 }
2810         }
2811
2812         return 0;
2813 }