net/openvswitch/flow_netlink.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2017 Nicira, Inc.
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include "flow.h"
   9 #include "datapath.h"
  10 #include <linux/uaccess.h>
  11 #include <linux/netdevice.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/if_ether.h>
  14 #include <linux/if_vlan.h>
  15 #include <net/llc_pdu.h>
  16 #include <linux/kernel.h>
  17 #include <linux/jhash.h>
  18 #include <linux/jiffies.h>
  19 #include <linux/llc.h>
  20 #include <linux/module.h>
  21 #include <linux/in.h>
  22 #include <linux/rcupdate.h>
  23 #include <linux/if_arp.h>
  24 #include <linux/ip.h>
  25 #include <linux/ipv6.h>
  26 #include <linux/sctp.h>
  27 #include <linux/tcp.h>
  28 #include <linux/udp.h>
  29 #include <linux/icmp.h>
  30 #include <linux/icmpv6.h>
  31 #include <linux/rculist.h>
  32 #include <net/geneve.h>
  33 #include <net/ip.h>
  34 #include <net/ipv6.h>
  35 #include <net/ndisc.h>
  36 #include <net/mpls.h>
  37 #include <net/vxlan.h>
  38 #include <net/tun_proto.h>
  39 #include <net/erspan.h>
  40
  41 #include "flow_netlink.h"
  42
  43 struct ovs_len_tbl {
  44         int len;
  45         const struct ovs_len_tbl *next;
  46 };
  47
  48 #define OVS_ATTR_NESTED -1
  49 #define OVS_ATTR_VARIABLE -2
  50
  51 static bool actions_may_change_flow(const struct nlattr *actions)
  52 {
  53         struct nlattr *nla;
  54         int rem;
  55
  56         nla_for_each_nested(nla, actions, rem) {
  57                 u16 action = nla_type(nla);
  58
  59                 switch (action) {
  60                 case OVS_ACTION_ATTR_OUTPUT:
  61                 case OVS_ACTION_ATTR_RECIRC:
  62                 case OVS_ACTION_ATTR_TRUNC:
  63                 case OVS_ACTION_ATTR_USERSPACE:
  64                         break;
  65
  66                 case OVS_ACTION_ATTR_CT:
  67                 case OVS_ACTION_ATTR_CT_CLEAR:
  68                 case OVS_ACTION_ATTR_HASH:
  69                 case OVS_ACTION_ATTR_POP_ETH:
  70                 case OVS_ACTION_ATTR_POP_MPLS:
  71                 case OVS_ACTION_ATTR_POP_NSH:
  72                 case OVS_ACTION_ATTR_POP_VLAN:
  73                 case OVS_ACTION_ATTR_PUSH_ETH:
  74                 case OVS_ACTION_ATTR_PUSH_MPLS:
  75                 case OVS_ACTION_ATTR_PUSH_NSH:
  76                 case OVS_ACTION_ATTR_PUSH_VLAN:
  77                 case OVS_ACTION_ATTR_SAMPLE:
  78                 case OVS_ACTION_ATTR_SET:
  79                 case OVS_ACTION_ATTR_SET_MASKED:
  80                 case OVS_ACTION_ATTR_METER:
  81                 case OVS_ACTION_ATTR_CHECK_PKT_LEN:
  82                 case OVS_ACTION_ATTR_ADD_MPLS:
  83                 case OVS_ACTION_ATTR_DEC_TTL:
  84                 default:
  85                         return true;
  86                 }
  87         }
  88         return false;
  89 }
  90
  91 static void update_range(struct sw_flow_match *match,
  92                          size_t offset, size_t size, bool is_mask)
  93 {
  94         struct sw_flow_key_range *range;
  95         size_t start = rounddown(offset, sizeof(long));
  96         size_t end = roundup(offset + size, sizeof(long));
  97
  98         if (!is_mask)
  99                 range = &match->range;
 100         else
 101                 range = &match->mask->range;
 102
 103         if (range->start == range->end) {
 104                 range->start = start;
 105                 range->end = end;
 106                 return;
 107         }
 108
 109         if (range->start > start)
 110                 range->start = start;
 111
 112         if (range->end < end)
 113                 range->end = end;
 114 }
 115
 116 #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
 117         do { \
 118                 update_range(match, offsetof(struct sw_flow_key, field),    \
 119                              sizeof((match)->key->field), is_mask);         \
 120                 if (is_mask)                                                \
 121                         (match)->mask->key.field = value;                   \
 122                 else                                                        \
 123                         (match)->key->field = value;                        \
 124         } while (0)
 125
 126 #define SW_FLOW_KEY_MEMCPY_OFFSET(match, offset, value_p, len, is_mask)     \
 127         do {                                                                \
 128                 update_range(match, offset, len, is_mask);                  \
 129                 if (is_mask)                                                \
 130                         memcpy((u8 *)&(match)->mask->key + offset, value_p, \
 131                                len);                                       \
 132                 else                                                        \
 133                         memcpy((u8 *)(match)->key + offset, value_p, len);  \
 134         } while (0)
 135
 136 #define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask)               \
 137         SW_FLOW_KEY_MEMCPY_OFFSET(match, offsetof(struct sw_flow_key, field), \
 138                                   value_p, len, is_mask)
 139
 140 #define SW_FLOW_KEY_MEMSET_FIELD(match, field, value, is_mask)              \
 141         do {                                                                \
 142                 update_range(match, offsetof(struct sw_flow_key, field),    \
 143                              sizeof((match)->key->field), is_mask);         \
 144                 if (is_mask)                                                \
 145                         memset((u8 *)&(match)->mask->key.field, value,      \
 146                                sizeof((match)->mask->key.field));           \
 147                 else                                                        \
 148                         memset((u8 *)&(match)->key->field, value,           \
 149                                sizeof((match)->key->field));                \
 150         } while (0)
 151
 152 static bool match_validate(const struct sw_flow_match *match,
 153                            u64 key_attrs, u64 mask_attrs, bool log)
 154 {
 155         u64 key_expected = 0;
 156         u64 mask_allowed = key_attrs;  /* At most allow all key attributes */
 157
 158         /* The following mask attributes allowed only if they
 159          * pass the validation tests. */
 160         mask_allowed &= ~((1 << OVS_KEY_ATTR_IPV4)
 161                         | (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4)
 162                         | (1 << OVS_KEY_ATTR_IPV6)
 163                         | (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)
 164                         | (1 << OVS_KEY_ATTR_TCP)
 165                         | (1 << OVS_KEY_ATTR_TCP_FLAGS)
 166                         | (1 << OVS_KEY_ATTR_UDP)
 167                         | (1 << OVS_KEY_ATTR_SCTP)
 168                         | (1 << OVS_KEY_ATTR_ICMP)
 169                         | (1 << OVS_KEY_ATTR_ICMPV6)
 170                         | (1 << OVS_KEY_ATTR_ARP)
 171                         | (1 << OVS_KEY_ATTR_ND)
 172                         | (1 << OVS_KEY_ATTR_MPLS)
 173                         | (1 << OVS_KEY_ATTR_NSH));
 174
 175         /* Always allowed mask fields. */
 176         mask_allowed |= ((1 << OVS_KEY_ATTR_TUNNEL)
 177                        | (1 << OVS_KEY_ATTR_IN_PORT)
 178                        | (1 << OVS_KEY_ATTR_ETHERTYPE));
 179
 180         /* Check key attributes. */
 181         if (match->key->eth.type == htons(ETH_P_ARP)
 182                         || match->key->eth.type == htons(ETH_P_RARP)) {
 183                 key_expected |= 1 << OVS_KEY_ATTR_ARP;
 184                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 185                         mask_allowed |= 1 << OVS_KEY_ATTR_ARP;
 186         }
 187
 188         if (eth_p_mpls(match->key->eth.type)) {
 189                 key_expected |= 1 << OVS_KEY_ATTR_MPLS;
 190                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 191                         mask_allowed |= 1 << OVS_KEY_ATTR_MPLS;
 192         }
 193
 194         if (match->key->eth.type == htons(ETH_P_IP)) {
 195                 key_expected |= 1 << OVS_KEY_ATTR_IPV4;
 196                 if (match->mask && match->mask->key.eth.type == htons(0xffff)) {
 197                         mask_allowed |= 1 << OVS_KEY_ATTR_IPV4;
 198                         mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4;
 199                 }
 200
 201                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 202                         if (match->key->ip.proto == IPPROTO_UDP) {
 203                                 key_expected |= 1 << OVS_KEY_ATTR_UDP;
 204                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 205                                         mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
 206                         }
 207
 208                         if (match->key->ip.proto == IPPROTO_SCTP) {
 209                                 key_expected |= 1 << OVS_KEY_ATTR_SCTP;
 210                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 211                                         mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
 212                         }
 213
 214                         if (match->key->ip.proto == IPPROTO_TCP) {
 215                                 key_expected |= 1 << OVS_KEY_ATTR_TCP;
 216                                 key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 217                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 218                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
 219                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 220                                 }
 221                         }
 222
 223                         if (match->key->ip.proto == IPPROTO_ICMP) {
 224                                 key_expected |= 1 << OVS_KEY_ATTR_ICMP;
 225                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 226                                         mask_allowed |= 1 << OVS_KEY_ATTR_ICMP;
 227                         }
 228                 }
 229         }
 230
 231         if (match->key->eth.type == htons(ETH_P_IPV6)) {
 232                 key_expected |= 1 << OVS_KEY_ATTR_IPV6;
 233                 if (match->mask && match->mask->key.eth.type == htons(0xffff)) {
 234                         mask_allowed |= 1 << OVS_KEY_ATTR_IPV6;
 235                         mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6;
 236                 }
 237
 238                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 239                         if (match->key->ip.proto == IPPROTO_UDP) {
 240                                 key_expected |= 1 << OVS_KEY_ATTR_UDP;
 241                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 242                                         mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
 243                         }
 244
 245                         if (match->key->ip.proto == IPPROTO_SCTP) {
 246                                 key_expected |= 1 << OVS_KEY_ATTR_SCTP;
 247                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 248                                         mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
 249                         }
 250
 251                         if (match->key->ip.proto == IPPROTO_TCP) {
 252                                 key_expected |= 1 << OVS_KEY_ATTR_TCP;
 253                                 key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 254                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 255                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
 256                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 257                                 }
 258                         }
 259
 260                         if (match->key->ip.proto == IPPROTO_ICMPV6) {
 261                                 key_expected |= 1 << OVS_KEY_ATTR_ICMPV6;
 262                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 263                                         mask_allowed |= 1 << OVS_KEY_ATTR_ICMPV6;
 264
 265                                 if (match->key->tp.src ==
 266                                                 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 267                                     match->key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 268                                         key_expected |= 1 << OVS_KEY_ATTR_ND;
 269                                         /* Original direction conntrack tuple
 270                                          * uses the same space as the ND fields
 271                                          * in the key, so both are not allowed
 272                                          * at the same time.
 273                                          */
 274                                         mask_allowed &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6);
 275                                         if (match->mask && (match->mask->key.tp.src == htons(0xff)))
 276                                                 mask_allowed |= 1 << OVS_KEY_ATTR_ND;
 277                                 }
 278                         }
 279                 }
 280         }
 281
 282         if (match->key->eth.type == htons(ETH_P_NSH)) {
 283                 key_expected |= 1 << OVS_KEY_ATTR_NSH;
 284                 if (match->mask &&
 285                     match->mask->key.eth.type == htons(0xffff)) {
 286                         mask_allowed |= 1 << OVS_KEY_ATTR_NSH;
 287                 }
 288         }
 289
 290         if ((key_attrs & key_expected) != key_expected) {
 291                 /* Key attributes check failed. */
 292                 OVS_NLERR(log, "Missing key (keys=%llx, expected=%llx)",
 293                           (unsigned long long)key_attrs,
 294                           (unsigned long long)key_expected);
 295                 return false;
 296         }
 297
 298         if ((mask_attrs & mask_allowed) != mask_attrs) {
 299                 /* Mask attributes check failed. */
 300                 OVS_NLERR(log, "Unexpected mask (mask=%llx, allowed=%llx)",
 301                           (unsigned long long)mask_attrs,
 302                           (unsigned long long)mask_allowed);
 303                 return false;
 304         }
 305
 306         return true;
 307 }
 308
 309 size_t ovs_tun_key_attr_size(void)
 310 {
 311         /* Whenever adding new OVS_TUNNEL_KEY_ FIELDS, we should consider
 312          * updating this function.
 313          */
 314         return    nla_total_size_64bit(8) /* OVS_TUNNEL_KEY_ATTR_ID */
 315                 + nla_total_size(16)   /* OVS_TUNNEL_KEY_ATTR_IPV[46]_SRC */
 316                 + nla_total_size(16)   /* OVS_TUNNEL_KEY_ATTR_IPV[46]_DST */
 317                 + nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TOS */
 318                 + nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TTL */
 319                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
 320                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_CSUM */
 321                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_OAM */
 322                 + nla_total_size(256)  /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */
 323                 /* OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS and
 324                  * OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS is mutually exclusive with
 325                  * OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS and covered by it.
 326                  */
 327                 + nla_total_size(2)    /* OVS_TUNNEL_KEY_ATTR_TP_SRC */
 328                 + nla_total_size(2);   /* OVS_TUNNEL_KEY_ATTR_TP_DST */
 329 }
 330
 331 static size_t ovs_nsh_key_attr_size(void)
 332 {
 333         /* Whenever adding new OVS_NSH_KEY_ FIELDS, we should consider
 334          * updating this function.
 335          */
 336         return  nla_total_size(NSH_BASE_HDR_LEN) /* OVS_NSH_KEY_ATTR_BASE */
 337                 /* OVS_NSH_KEY_ATTR_MD1 and OVS_NSH_KEY_ATTR_MD2 are
 338                  * mutually exclusive, so the bigger one can cover
 339                  * the small one.
 340                  */
 341                 + nla_total_size(NSH_CTX_HDRS_MAX_LEN);
 342 }
 343
 344 size_t ovs_key_attr_size(void)
 345 {
 346         /* Whenever adding new OVS_KEY_ FIELDS, we should consider
 347          * updating this function.
 348          */
 349         BUILD_BUG_ON(OVS_KEY_ATTR_MAX != 32);
 350
 351         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
 352                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
 353                   + ovs_tun_key_attr_size()
 354                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
 355                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
 356                 + nla_total_size(4)   /* OVS_KEY_ATTR_DP_HASH */
 357                 + nla_total_size(4)   /* OVS_KEY_ATTR_RECIRC_ID */
 358                 + nla_total_size(4)   /* OVS_KEY_ATTR_CT_STATE */
 359                 + nla_total_size(2)   /* OVS_KEY_ATTR_CT_ZONE */
 360                 + nla_total_size(4)   /* OVS_KEY_ATTR_CT_MARK */
 361                 + nla_total_size(16)  /* OVS_KEY_ATTR_CT_LABELS */
 362                 + nla_total_size(40)  /* OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6 */
 363                 + nla_total_size(0)   /* OVS_KEY_ATTR_NSH */
 364                   + ovs_nsh_key_attr_size()
 365                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
 366                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 367                 + nla_total_size(4)   /* OVS_KEY_ATTR_VLAN */
 368                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
 369                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 370                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
 371                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
 372                 + nla_total_size(28)  /* OVS_KEY_ATTR_ND */
 373                 + nla_total_size(2);  /* OVS_KEY_ATTR_IPV6_EXTHDRS */
 374 }
 375
 376 static const struct ovs_len_tbl ovs_vxlan_ext_key_lens[OVS_VXLAN_EXT_MAX + 1] = {
 377         [OVS_VXLAN_EXT_GBP]         = { .len = sizeof(u32) },
 378 };
 379
 380 static const struct ovs_len_tbl ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
 381         [OVS_TUNNEL_KEY_ATTR_ID]            = { .len = sizeof(u64) },
 382         [OVS_TUNNEL_KEY_ATTR_IPV4_SRC]      = { .len = sizeof(u32) },
 383         [OVS_TUNNEL_KEY_ATTR_IPV4_DST]      = { .len = sizeof(u32) },
 384         [OVS_TUNNEL_KEY_ATTR_TOS]           = { .len = 1 },
 385         [OVS_TUNNEL_KEY_ATTR_TTL]           = { .len = 1 },
 386         [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = { .len = 0 },
 387         [OVS_TUNNEL_KEY_ATTR_CSUM]          = { .len = 0 },
 388         [OVS_TUNNEL_KEY_ATTR_TP_SRC]        = { .len = sizeof(u16) },
 389         [OVS_TUNNEL_KEY_ATTR_TP_DST]        = { .len = sizeof(u16) },
 390         [OVS_TUNNEL_KEY_ATTR_OAM]           = { .len = 0 },
 391         [OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS]   = { .len = OVS_ATTR_VARIABLE },
 392         [OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS]    = { .len = OVS_ATTR_NESTED,
 393                                                 .next = ovs_vxlan_ext_key_lens },
 394         [OVS_TUNNEL_KEY_ATTR_IPV6_SRC]      = { .len = sizeof(struct in6_addr) },
 395         [OVS_TUNNEL_KEY_ATTR_IPV6_DST]      = { .len = sizeof(struct in6_addr) },
 396         [OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS]   = { .len = OVS_ATTR_VARIABLE },
 397         [OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE]   = { .len = 0 },
 398 };
 399
 400 static const struct ovs_len_tbl
 401 ovs_nsh_key_attr_lens[OVS_NSH_KEY_ATTR_MAX + 1] = {
 402         [OVS_NSH_KEY_ATTR_BASE] = { .len = sizeof(struct ovs_nsh_key_base) },
 403         [OVS_NSH_KEY_ATTR_MD1]  = { .len = sizeof(struct ovs_nsh_key_md1) },
 404         [OVS_NSH_KEY_ATTR_MD2]  = { .len = OVS_ATTR_VARIABLE },
 405 };
 406
 407 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
 408 static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
 409         [OVS_KEY_ATTR_ENCAP]     = { .len = OVS_ATTR_NESTED },
 410         [OVS_KEY_ATTR_PRIORITY]  = { .len = sizeof(u32) },
 411         [OVS_KEY_ATTR_IN_PORT]   = { .len = sizeof(u32) },
 412         [OVS_KEY_ATTR_SKB_MARK]  = { .len = sizeof(u32) },
 413         [OVS_KEY_ATTR_ETHERNET]  = { .len = sizeof(struct ovs_key_ethernet) },
 414         [OVS_KEY_ATTR_VLAN]      = { .len = sizeof(__be16) },
 415         [OVS_KEY_ATTR_ETHERTYPE] = { .len = sizeof(__be16) },
 416         [OVS_KEY_ATTR_IPV4]      = { .len = sizeof(struct ovs_key_ipv4) },
 417         [OVS_KEY_ATTR_IPV6]      = { .len = sizeof(struct ovs_key_ipv6) },
 418         [OVS_KEY_ATTR_TCP]       = { .len = sizeof(struct ovs_key_tcp) },
 419         [OVS_KEY_ATTR_TCP_FLAGS] = { .len = sizeof(__be16) },
 420         [OVS_KEY_ATTR_UDP]       = { .len = sizeof(struct ovs_key_udp) },
 421         [OVS_KEY_ATTR_SCTP]      = { .len = sizeof(struct ovs_key_sctp) },
 422         [OVS_KEY_ATTR_ICMP]      = { .len = sizeof(struct ovs_key_icmp) },
 423         [OVS_KEY_ATTR_ICMPV6]    = { .len = sizeof(struct ovs_key_icmpv6) },
 424         [OVS_KEY_ATTR_ARP]       = { .len = sizeof(struct ovs_key_arp) },
 425         [OVS_KEY_ATTR_ND]        = { .len = sizeof(struct ovs_key_nd) },
 426         [OVS_KEY_ATTR_RECIRC_ID] = { .len = sizeof(u32) },
 427         [OVS_KEY_ATTR_DP_HASH]   = { .len = sizeof(u32) },
 428         [OVS_KEY_ATTR_TUNNEL]    = { .len = OVS_ATTR_NESTED,
 429                                      .next = ovs_tunnel_key_lens, },
 430         [OVS_KEY_ATTR_MPLS]      = { .len = OVS_ATTR_VARIABLE },
 431         [OVS_KEY_ATTR_CT_STATE]  = { .len = sizeof(u32) },
 432         [OVS_KEY_ATTR_CT_ZONE]   = { .len = sizeof(u16) },
 433         [OVS_KEY_ATTR_CT_MARK]   = { .len = sizeof(u32) },
 434         [OVS_KEY_ATTR_CT_LABELS] = { .len = sizeof(struct ovs_key_ct_labels) },
 435         [OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4] = {
 436                 .len = sizeof(struct ovs_key_ct_tuple_ipv4) },
 437         [OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6] = {
 438                 .len = sizeof(struct ovs_key_ct_tuple_ipv6) },
 439         [OVS_KEY_ATTR_NSH]       = { .len = OVS_ATTR_NESTED,
 440                                      .next = ovs_nsh_key_attr_lens, },
 441         [OVS_KEY_ATTR_IPV6_EXTHDRS] = {
 442                 .len = sizeof(struct ovs_key_ipv6_exthdrs) },
 443 };
 444
 445 static bool check_attr_len(unsigned int attr_len, unsigned int expected_len)
 446 {
 447         return expected_len == attr_len ||
 448                expected_len == OVS_ATTR_NESTED ||
 449                expected_len == OVS_ATTR_VARIABLE;
 450 }
 451
 452 static bool is_all_zero(const u8 *fp, size_t size)
 453 {
 454         int i;
 455
 456         if (!fp)
 457                 return false;
 458
 459         for (i = 0; i < size; i++)
 460                 if (fp[i])
 461                         return false;
 462
 463         return true;
 464 }
 465
 466 static int __parse_flow_nlattrs(const struct nlattr *attr,
 467                                 const struct nlattr *a[],
 468                                 u64 *attrsp, bool log, bool nz)
 469 {
 470         const struct nlattr *nla;
 471         u64 attrs;
 472         int rem;
 473
 474         attrs = *attrsp;
 475         nla_for_each_nested(nla, attr, rem) {
 476                 u16 type = nla_type(nla);
 477                 int expected_len;
 478
 479                 if (type > OVS_KEY_ATTR_MAX) {
 480                         OVS_NLERR(log, "Key type %d is out of range max %d",
 481                                   type, OVS_KEY_ATTR_MAX);
 482                         return -EINVAL;
 483                 }
 484
 485                 if (type == OVS_KEY_ATTR_PACKET_TYPE ||
 486                     type == OVS_KEY_ATTR_ND_EXTENSIONS ||
 487                     type == OVS_KEY_ATTR_TUNNEL_INFO) {
 488                         OVS_NLERR(log, "Key type %d is not supported", type);
 489                         return -EINVAL;
 490                 }
 491
 492                 if (attrs & (1ULL << type)) {
 493                         OVS_NLERR(log, "Duplicate key (type %d).", type);
 494                         return -EINVAL;
 495                 }
 496
 497                 expected_len = ovs_key_lens[type].len;
 498                 if (!check_attr_len(nla_len(nla), expected_len)) {
 499                         OVS_NLERR(log, "Key %d has unexpected len %d expected %d",
 500                                   type, nla_len(nla), expected_len);
 501                         return -EINVAL;
 502                 }
 503
 504                 if (!nz || !is_all_zero(nla_data(nla), nla_len(nla))) {
 505                         attrs |= 1ULL << type;
 506                         a[type] = nla;
 507                 }
 508         }
 509         if (rem) {
 510                 OVS_NLERR(log, "Message has %d unknown bytes.", rem);
 511                 return -EINVAL;
 512         }
 513
 514         *attrsp = attrs;
 515         return 0;
 516 }
 517
 518 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
 519                                    const struct nlattr *a[], u64 *attrsp,
 520                                    bool log)
 521 {
 522         return __parse_flow_nlattrs(attr, a, attrsp, log, true);
 523 }
 524
 525 int parse_flow_nlattrs(const struct nlattr *attr, const struct nlattr *a[],
 526                        u64 *attrsp, bool log)
 527 {
 528         return __parse_flow_nlattrs(attr, a, attrsp, log, false);
 529 }
 530
 531 static int genev_tun_opt_from_nlattr(const struct nlattr *a,
 532                                      struct sw_flow_match *match, bool is_mask,
 533                                      bool log)
 534 {
 535         unsigned long opt_key_offset;
 536
 537         if (nla_len(a) > sizeof(match->key->tun_opts)) {
 538                 OVS_NLERR(log, "Geneve option length err (len %d, max %zu).",
 539                           nla_len(a), sizeof(match->key->tun_opts));
 540                 return -EINVAL;
 541         }
 542
 543         if (nla_len(a) % 4 != 0) {
 544                 OVS_NLERR(log, "Geneve opt len %d is not a multiple of 4.",
 545                           nla_len(a));
 546                 return -EINVAL;
 547         }
 548
 549         /* We need to record the length of the options passed
 550          * down, otherwise packets with the same format but
 551          * additional options will be silently matched.
 552          */
 553         if (!is_mask) {
 554                 SW_FLOW_KEY_PUT(match, tun_opts_len, nla_len(a),
 555                                 false);
 556         } else {
 557                 /* This is somewhat unusual because it looks at
 558                  * both the key and mask while parsing the
 559                  * attributes (and by extension assumes the key
 560                  * is parsed first). Normally, we would verify
 561                  * that each is the correct length and that the
 562                  * attributes line up in the validate function.
 563                  * However, that is difficult because this is
 564                  * variable length and we won't have the
 565                  * information later.
 566                  */
 567                 if (match->key->tun_opts_len != nla_len(a)) {
 568                         OVS_NLERR(log, "Geneve option len %d != mask len %d",
 569                                   match->key->tun_opts_len, nla_len(a));
 570                         return -EINVAL;
 571                 }
 572
 573                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
 574         }
 575
 576         opt_key_offset = TUN_METADATA_OFFSET(nla_len(a));
 577         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a),
 578                                   nla_len(a), is_mask);
 579         return 0;
 580 }
 581
 582 static int vxlan_tun_opt_from_nlattr(const struct nlattr *attr,
 583                                      struct sw_flow_match *match, bool is_mask,
 584                                      bool log)
 585 {
 586         struct nlattr *a;
 587         int rem;
 588         unsigned long opt_key_offset;
 589         struct vxlan_metadata opts;
 590
 591         BUILD_BUG_ON(sizeof(opts) > sizeof(match->key->tun_opts));
 592
 593         memset(&opts, 0, sizeof(opts));
 594         nla_for_each_nested(a, attr, rem) {
 595                 int type = nla_type(a);
 596
 597                 if (type > OVS_VXLAN_EXT_MAX) {
 598                         OVS_NLERR(log, "VXLAN extension %d out of range max %d",
 599                                   type, OVS_VXLAN_EXT_MAX);
 600                         return -EINVAL;
 601                 }
 602
 603                 if (!check_attr_len(nla_len(a),
 604                                     ovs_vxlan_ext_key_lens[type].len)) {
 605                         OVS_NLERR(log, "VXLAN extension %d has unexpected len %d expected %d",
 606                                   type, nla_len(a),
 607                                   ovs_vxlan_ext_key_lens[type].len);
 608                         return -EINVAL;
 609                 }
 610
 611                 switch (type) {
 612                 case OVS_VXLAN_EXT_GBP:
 613                         opts.gbp = nla_get_u32(a);
 614                         break;
 615                 default:
 616                         OVS_NLERR(log, "Unknown VXLAN extension attribute %d",
 617                                   type);
 618                         return -EINVAL;
 619                 }
 620         }
 621         if (rem) {
 622                 OVS_NLERR(log, "VXLAN extension message has %d unknown bytes.",
 623                           rem);
 624                 return -EINVAL;
 625         }
 626
 627         if (!is_mask)
 628                 SW_FLOW_KEY_PUT(match, tun_opts_len, sizeof(opts), false);
 629         else
 630                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
 631
 632         opt_key_offset = TUN_METADATA_OFFSET(sizeof(opts));
 633         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, &opts, sizeof(opts),
 634                                   is_mask);
 635         return 0;
 636 }
 637
 638 static int erspan_tun_opt_from_nlattr(const struct nlattr *a,
 639                                       struct sw_flow_match *match, bool is_mask,
 640                                       bool log)
 641 {
 642         unsigned long opt_key_offset;
 643
 644         BUILD_BUG_ON(sizeof(struct erspan_metadata) >
 645                      sizeof(match->key->tun_opts));
 646
 647         if (nla_len(a) > sizeof(match->key->tun_opts)) {
 648                 OVS_NLERR(log, "ERSPAN option length err (len %d, max %zu).",
 649                           nla_len(a), sizeof(match->key->tun_opts));
 650                 return -EINVAL;
 651         }
 652
 653         if (!is_mask)
 654                 SW_FLOW_KEY_PUT(match, tun_opts_len,
 655                                 sizeof(struct erspan_metadata), false);
 656         else
 657                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
 658
 659         opt_key_offset = TUN_METADATA_OFFSET(nla_len(a));
 660         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a),
 661                                   nla_len(a), is_mask);
 662         return 0;
 663 }
 664
 665 static int ip_tun_from_nlattr(const struct nlattr *attr,
 666                               struct sw_flow_match *match, bool is_mask,
 667                               bool log)
 668 {
 669         bool ttl = false, ipv4 = false, ipv6 = false;
 670         bool info_bridge_mode = false;
 671         __be16 tun_flags = 0;
 672         int opts_type = 0;
 673         struct nlattr *a;
 674         int rem;
 675
 676         nla_for_each_nested(a, attr, rem) {
 677                 int type = nla_type(a);
 678                 int err;
 679
 680                 if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
 681                         OVS_NLERR(log, "Tunnel attr %d out of range max %d",
 682                                   type, OVS_TUNNEL_KEY_ATTR_MAX);
 683                         return -EINVAL;
 684                 }
 685
 686                 if (!check_attr_len(nla_len(a),
 687                                     ovs_tunnel_key_lens[type].len)) {
 688                         OVS_NLERR(log, "Tunnel attr %d has unexpected len %d expected %d",
 689                                   type, nla_len(a), ovs_tunnel_key_lens[type].len);
 690                         return -EINVAL;
 691                 }
 692
 693                 switch (type) {
 694                 case OVS_TUNNEL_KEY_ATTR_ID:
 695                         SW_FLOW_KEY_PUT(match, tun_key.tun_id,
 696                                         nla_get_be64(a), is_mask);
 697                         tun_flags |= TUNNEL_KEY;
 698                         break;
 699                 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
 700                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.src,
 701                                         nla_get_in_addr(a), is_mask);
 702                         ipv4 = true;
 703                         break;
 704                 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
 705                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.dst,
 706                                         nla_get_in_addr(a), is_mask);
 707                         ipv4 = true;
 708                         break;
 709                 case OVS_TUNNEL_KEY_ATTR_IPV6_SRC:
 710                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.src,
 711                                         nla_get_in6_addr(a), is_mask);
 712                         ipv6 = true;
 713                         break;
 714                 case OVS_TUNNEL_KEY_ATTR_IPV6_DST:
 715                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.dst,
 716                                         nla_get_in6_addr(a), is_mask);
 717                         ipv6 = true;
 718                         break;
 719                 case OVS_TUNNEL_KEY_ATTR_TOS:
 720                         SW_FLOW_KEY_PUT(match, tun_key.tos,
 721                                         nla_get_u8(a), is_mask);
 722                         break;
 723                 case OVS_TUNNEL_KEY_ATTR_TTL:
 724                         SW_FLOW_KEY_PUT(match, tun_key.ttl,
 725                                         nla_get_u8(a), is_mask);
 726                         ttl = true;
 727                         break;
 728                 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
 729                         tun_flags |= TUNNEL_DONT_FRAGMENT;
 730                         break;
 731                 case OVS_TUNNEL_KEY_ATTR_CSUM:
 732                         tun_flags |= TUNNEL_CSUM;
 733                         break;
 734                 case OVS_TUNNEL_KEY_ATTR_TP_SRC:
 735                         SW_FLOW_KEY_PUT(match, tun_key.tp_src,
 736                                         nla_get_be16(a), is_mask);
 737                         break;
 738                 case OVS_TUNNEL_KEY_ATTR_TP_DST:
 739                         SW_FLOW_KEY_PUT(match, tun_key.tp_dst,
 740                                         nla_get_be16(a), is_mask);
 741                         break;
 742                 case OVS_TUNNEL_KEY_ATTR_OAM:
 743                         tun_flags |= TUNNEL_OAM;
 744                         break;
 745                 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
 746                         if (opts_type) {
 747                                 OVS_NLERR(log, "Multiple metadata blocks provided");
 748                                 return -EINVAL;
 749                         }
 750
 751                         err = genev_tun_opt_from_nlattr(a, match, is_mask, log);
 752                         if (err)
 753                                 return err;
 754
 755                         tun_flags |= TUNNEL_GENEVE_OPT;
 756                         opts_type = type;
 757                         break;
 758                 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
 759                         if (opts_type) {
 760                                 OVS_NLERR(log, "Multiple metadata blocks provided");
 761                                 return -EINVAL;
 762                         }
 763
 764                         err = vxlan_tun_opt_from_nlattr(a, match, is_mask, log);
 765                         if (err)
 766                                 return err;
 767
 768                         tun_flags |= TUNNEL_VXLAN_OPT;
 769                         opts_type = type;
 770                         break;
 771                 case OVS_TUNNEL_KEY_ATTR_PAD:
 772                         break;
 773                 case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS:
 774                         if (opts_type) {
 775                                 OVS_NLERR(log, "Multiple metadata blocks provided");
 776                                 return -EINVAL;
 777                         }
 778
 779                         err = erspan_tun_opt_from_nlattr(a, match, is_mask,
 780                                                          log);
 781                         if (err)
 782                                 return err;
 783
 784                         tun_flags |= TUNNEL_ERSPAN_OPT;
 785                         opts_type = type;
 786                         break;
 787                 case OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE:
 788                         info_bridge_mode = true;
 789                         ipv4 = true;
 790                         break;
 791                 default:
 792                         OVS_NLERR(log, "Unknown IP tunnel attribute %d",
 793                                   type);
 794                         return -EINVAL;
 795                 }
 796         }
 797
 798         SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
 799         if (is_mask)
 800                 SW_FLOW_KEY_MEMSET_FIELD(match, tun_proto, 0xff, true);
 801         else
 802                 SW_FLOW_KEY_PUT(match, tun_proto, ipv6 ? AF_INET6 : AF_INET,
 803                                 false);
 804
 805         if (rem > 0) {
 806                 OVS_NLERR(log, "IP tunnel attribute has %d unknown bytes.",
 807                           rem);
 808                 return -EINVAL;
 809         }
 810
 811         if (ipv4 && ipv6) {
 812                 OVS_NLERR(log, "Mixed IPv4 and IPv6 tunnel attributes");
 813                 return -EINVAL;
 814         }
 815
 816         if (!is_mask) {
 817                 if (!ipv4 && !ipv6) {
 818                         OVS_NLERR(log, "IP tunnel dst address not specified");
 819                         return -EINVAL;
 820                 }
 821                 if (ipv4) {
 822                         if (info_bridge_mode) {
 823                                 if (match->key->tun_key.u.ipv4.src ||
 824                                     match->key->tun_key.u.ipv4.dst ||
 825                                     match->key->tun_key.tp_src ||
 826                                     match->key->tun_key.tp_dst ||
 827                                     match->key->tun_key.ttl ||
 828                                     match->key->tun_key.tos ||
 829                                     tun_flags & ~TUNNEL_KEY) {
 830                                         OVS_NLERR(log, "IPv4 tun info is not correct");
 831                                         return -EINVAL;
 832                                 }
 833                         } else if (!match->key->tun_key.u.ipv4.dst) {
 834                                 OVS_NLERR(log, "IPv4 tunnel dst address is zero");
 835                                 return -EINVAL;
 836                         }
 837                 }
 838                 if (ipv6 && ipv6_addr_any(&match->key->tun_key.u.ipv6.dst)) {
 839                         OVS_NLERR(log, "IPv6 tunnel dst address is zero");
 840                         return -EINVAL;
 841                 }
 842
 843                 if (!ttl && !info_bridge_mode) {
 844                         OVS_NLERR(log, "IP tunnel TTL not specified.");
 845                         return -EINVAL;
 846                 }
 847         }
 848
 849         return opts_type;
 850 }
 851
 852 static int vxlan_opt_to_nlattr(struct sk_buff *skb,
 853                                const void *tun_opts, int swkey_tun_opts_len)
 854 {
 855         const struct vxlan_metadata *opts = tun_opts;
 856         struct nlattr *nla;
 857
 858         nla = nla_nest_start_noflag(skb, OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS);
 859         if (!nla)
 860                 return -EMSGSIZE;
 861
 862         if (nla_put_u32(skb, OVS_VXLAN_EXT_GBP, opts->gbp) < 0)
 863                 return -EMSGSIZE;
 864
 865         nla_nest_end(skb, nla);
 866         return 0;
 867 }
 868
 869 static int __ip_tun_to_nlattr(struct sk_buff *skb,
 870                               const struct ip_tunnel_key *output,
 871                               const void *tun_opts, int swkey_tun_opts_len,
 872                               unsigned short tun_proto, u8 mode)
 873 {
 874         if (output->tun_flags & TUNNEL_KEY &&
 875             nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id,
 876                          OVS_TUNNEL_KEY_ATTR_PAD))
 877                 return -EMSGSIZE;
 878
 879         if (mode & IP_TUNNEL_INFO_BRIDGE)
 880                 return nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE)
 881                        ? -EMSGSIZE : 0;
 882
 883         switch (tun_proto) {
 884         case AF_INET:
 885                 if (output->u.ipv4.src &&
 886                     nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC,
 887                                     output->u.ipv4.src))
 888                         return -EMSGSIZE;
 889                 if (output->u.ipv4.dst &&
 890                     nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST,
 891                                     output->u.ipv4.dst))
 892                         return -EMSGSIZE;
 893                 break;
 894         case AF_INET6:
 895                 if (!ipv6_addr_any(&output->u.ipv6.src) &&
 896                     nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_SRC,
 897                                      &output->u.ipv6.src))
 898                         return -EMSGSIZE;
 899                 if (!ipv6_addr_any(&output->u.ipv6.dst) &&
 900                     nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_DST,
 901                                      &output->u.ipv6.dst))
 902                         return -EMSGSIZE;
 903                 break;
 904         }
 905         if (output->tos &&
 906             nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->tos))
 907                 return -EMSGSIZE;
 908         if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ttl))
 909                 return -EMSGSIZE;
 910         if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
 911             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
 912                 return -EMSGSIZE;
 913         if ((output->tun_flags & TUNNEL_CSUM) &&
 914             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
 915                 return -EMSGSIZE;
 916         if (output->tp_src &&
 917             nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_SRC, output->tp_src))
 918                 return -EMSGSIZE;
 919         if (output->tp_dst &&
 920             nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_DST, output->tp_dst))
 921                 return -EMSGSIZE;
 922         if ((output->tun_flags & TUNNEL_OAM) &&
 923             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_OAM))
 924                 return -EMSGSIZE;
 925         if (swkey_tun_opts_len) {
 926                 if (output->tun_flags & TUNNEL_GENEVE_OPT &&
 927                     nla_put(skb, OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS,
 928                             swkey_tun_opts_len, tun_opts))
 929                         return -EMSGSIZE;
 930                 else if (output->tun_flags & TUNNEL_VXLAN_OPT &&
 931                          vxlan_opt_to_nlattr(skb, tun_opts, swkey_tun_opts_len))
 932                         return -EMSGSIZE;
 933                 else if (output->tun_flags & TUNNEL_ERSPAN_OPT &&
 934                          nla_put(skb, OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS,
 935                                  swkey_tun_opts_len, tun_opts))
 936                         return -EMSGSIZE;
 937         }
 938
 939         return 0;
 940 }
 941
 942 static int ip_tun_to_nlattr(struct sk_buff *skb,
 943                             const struct ip_tunnel_key *output,
 944                             const void *tun_opts, int swkey_tun_opts_len,
 945                             unsigned short tun_proto, u8 mode)
 946 {
 947         struct nlattr *nla;
 948         int err;
 949
 950         nla = nla_nest_start_noflag(skb, OVS_KEY_ATTR_TUNNEL);
 951         if (!nla)
 952                 return -EMSGSIZE;
 953
 954         err = __ip_tun_to_nlattr(skb, output, tun_opts, swkey_tun_opts_len,
 955                                  tun_proto, mode);
 956         if (err)
 957                 return err;
 958
 959         nla_nest_end(skb, nla);
 960         return 0;
 961 }
 962
 963 int ovs_nla_put_tunnel_info(struct sk_buff *skb,
 964                             struct ip_tunnel_info *tun_info)
 965 {
 966         return __ip_tun_to_nlattr(skb, &tun_info->key,
 967                                   ip_tunnel_info_opts(tun_info),
 968                                   tun_info->options_len,
 969                                   ip_tunnel_info_af(tun_info), tun_info->mode);
 970 }
 971
 972 static int encode_vlan_from_nlattrs(struct sw_flow_match *match,
 973                                     const struct nlattr *a[],
 974                                     bool is_mask, bool inner)
 975 {
 976         __be16 tci = 0;
 977         __be16 tpid = 0;
 978
 979         if (a[OVS_KEY_ATTR_VLAN])
 980                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 981
 982         if (a[OVS_KEY_ATTR_ETHERTYPE])
 983                 tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 984
 985         if (likely(!inner)) {
 986                 SW_FLOW_KEY_PUT(match, eth.vlan.tpid, tpid, is_mask);
 987                 SW_FLOW_KEY_PUT(match, eth.vlan.tci, tci, is_mask);
 988         } else {
 989                 SW_FLOW_KEY_PUT(match, eth.cvlan.tpid, tpid, is_mask);
 990                 SW_FLOW_KEY_PUT(match, eth.cvlan.tci, tci, is_mask);
 991         }
 992         return 0;
 993 }
 994
 995 static int validate_vlan_from_nlattrs(const struct sw_flow_match *match,
 996                                       u64 key_attrs, bool inner,
 997                                       const struct nlattr **a, bool log)
 998 {
 999         __be16 tci = 0;
1000
1001         if (!((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) &&
1002               (key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
1003                eth_type_vlan(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE])))) {
1004                 /* Not a VLAN. */
1005                 return 0;
1006         }
1007
1008         if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
1009               (key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
1010                 OVS_NLERR(log, "Invalid %s frame", (inner) ? "C-VLAN" : "VLAN");
1011                 return -EINVAL;
1012         }
1013
1014         if (a[OVS_KEY_ATTR_VLAN])
1015                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1016
1017         if (!(tci & htons(VLAN_CFI_MASK))) {
1018                 if (tci) {
1019                         OVS_NLERR(log, "%s TCI does not have VLAN_CFI_MASK bit set.",
1020                                   (inner) ? "C-VLAN" : "VLAN");
1021                         return -EINVAL;
1022                 } else if (nla_len(a[OVS_KEY_ATTR_ENCAP])) {
1023                         /* Corner case for truncated VLAN header. */
1024                         OVS_NLERR(log, "Truncated %s header has non-zero encap attribute.",
1025                                   (inner) ? "C-VLAN" : "VLAN");
1026                         return -EINVAL;
1027                 }
1028         }
1029
1030         return 1;
1031 }
1032
1033 static int validate_vlan_mask_from_nlattrs(const struct sw_flow_match *match,
1034                                            u64 key_attrs, bool inner,
1035                                            const struct nlattr **a, bool log)
1036 {
1037         __be16 tci = 0;
1038         __be16 tpid = 0;
1039         bool encap_valid = !!(match->key->eth.vlan.tci &
1040                               htons(VLAN_CFI_MASK));
1041         bool i_encap_valid = !!(match->key->eth.cvlan.tci &
1042                                 htons(VLAN_CFI_MASK));
1043
1044         if (!(key_attrs & (1 << OVS_KEY_ATTR_ENCAP))) {
1045                 /* Not a VLAN. */
1046                 return 0;
1047         }
1048
1049         if ((!inner && !encap_valid) || (inner && !i_encap_valid)) {
1050                 OVS_NLERR(log, "Encap mask attribute is set for non-%s frame.",
1051                           (inner) ? "C-VLAN" : "VLAN");
1052                 return -EINVAL;
1053         }
1054
1055         if (a[OVS_KEY_ATTR_VLAN])
1056                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1057
1058         if (a[OVS_KEY_ATTR_ETHERTYPE])
1059                 tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1060
1061         if (tpid != htons(0xffff)) {
1062                 OVS_NLERR(log, "Must have an exact match on %s TPID (mask=%x).",
1063                           (inner) ? "C-VLAN" : "VLAN", ntohs(tpid));
1064                 return -EINVAL;
1065         }
1066         if (!(tci & htons(VLAN_CFI_MASK))) {
1067                 OVS_NLERR(log, "%s TCI mask does not have exact match for VLAN_CFI_MASK bit.",
1068                           (inner) ? "C-VLAN" : "VLAN");
1069                 return -EINVAL;
1070         }
1071
1072         return 1;
1073 }
1074
1075 static int __parse_vlan_from_nlattrs(struct sw_flow_match *match,
1076                                      u64 *key_attrs, bool inner,
1077                                      const struct nlattr **a, bool is_mask,
1078                                      bool log)
1079 {
1080         int err;
1081         const struct nlattr *encap;
1082
1083         if (!is_mask)
1084                 err = validate_vlan_from_nlattrs(match, *key_attrs, inner,
1085                                                  a, log);
1086         else
1087                 err = validate_vlan_mask_from_nlattrs(match, *key_attrs, inner,
1088                                                       a, log);
1089         if (err <= 0)
1090                 return err;
1091
1092         err = encode_vlan_from_nlattrs(match, a, is_mask, inner);
1093         if (err)
1094                 return err;
1095
1096         *key_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
1097         *key_attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
1098         *key_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
1099
1100         encap = a[OVS_KEY_ATTR_ENCAP];
1101
1102         if (!is_mask)
1103                 err = parse_flow_nlattrs(encap, a, key_attrs, log);
1104         else
1105                 err = parse_flow_mask_nlattrs(encap, a, key_attrs, log);
1106
1107         return err;
1108 }
1109
1110 static int parse_vlan_from_nlattrs(struct sw_flow_match *match,
1111                                    u64 *key_attrs, const struct nlattr **a,
1112                                    bool is_mask, bool log)
1113 {
1114         int err;
1115         bool encap_valid = false;
1116
1117         err = __parse_vlan_from_nlattrs(match, key_attrs, false, a,
1118                                         is_mask, log);
1119         if (err)
1120                 return err;
1121
1122         encap_valid = !!(match->key->eth.vlan.tci & htons(VLAN_CFI_MASK));
1123         if (encap_valid) {
1124                 err = __parse_vlan_from_nlattrs(match, key_attrs, true, a,
1125                                                 is_mask, log);
1126                 if (err)
1127                         return err;
1128         }
1129
1130         return 0;
1131 }
1132
1133 static int parse_eth_type_from_nlattrs(struct sw_flow_match *match,
1134                                        u64 *attrs, const struct nlattr **a,
1135                                        bool is_mask, bool log)
1136 {
1137         __be16 eth_type;
1138
1139         eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1140         if (is_mask) {
1141                 /* Always exact match EtherType. */
1142                 eth_type = htons(0xffff);
1143         } else if (!eth_proto_is_802_3(eth_type)) {
1144                 OVS_NLERR(log, "EtherType %x is less than min %x",
1145                                 ntohs(eth_type), ETH_P_802_3_MIN);
1146                 return -EINVAL;
1147         }
1148
1149         SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
1150         *attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
1151         return 0;
1152 }
1153
1154 static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
1155                                  u64 *attrs, const struct nlattr **a,
1156                                  bool is_mask, bool log)
1157 {
1158         u8 mac_proto = MAC_PROTO_ETHERNET;
1159
1160         if (*attrs & (1 << OVS_KEY_ATTR_DP_HASH)) {
1161                 u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]);
1162
1163                 SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask);
1164                 *attrs &= ~(1 << OVS_KEY_ATTR_DP_HASH);
1165         }
1166
1167         if (*attrs & (1 << OVS_KEY_ATTR_RECIRC_ID)) {
1168                 u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]);
1169
1170                 SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask);
1171                 *attrs &= ~(1 << OVS_KEY_ATTR_RECIRC_ID);
1172         }
1173
1174         if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
1175                 SW_FLOW_KEY_PUT(match, phy.priority,
1176                           nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
1177                 *attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY);
1178         }
1179
1180         if (*attrs & (1 << OVS_KEY_ATTR_IN_PORT)) {
1181                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
1182
1183                 if (is_mask) {
1184                         in_port = 0xffffffff; /* Always exact match in_port. */
1185                 } else if (in_port >= DP_MAX_PORTS) {
1186                         OVS_NLERR(log, "Port %d exceeds max allowable %d",
1187                                   in_port, DP_MAX_PORTS);
1188                         return -EINVAL;
1189                 }
1190
1191                 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
1192                 *attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT);
1193         } else if (!is_mask) {
1194                 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
1195         }
1196
1197         if (*attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) {
1198                 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
1199
1200                 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
1201                 *attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK);
1202         }
1203         if (*attrs & (1 << OVS_KEY_ATTR_TUNNEL)) {
1204                 if (ip_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
1205                                        is_mask, log) < 0)
1206                         return -EINVAL;
1207                 *attrs &= ~(1 << OVS_KEY_ATTR_TUNNEL);
1208         }
1209
1210         if (*attrs & (1 << OVS_KEY_ATTR_CT_STATE) &&
1211             ovs_ct_verify(net, OVS_KEY_ATTR_CT_STATE)) {
1212                 u32 ct_state = nla_get_u32(a[OVS_KEY_ATTR_CT_STATE]);
1213
1214                 if (ct_state & ~CT_SUPPORTED_MASK) {
1215                         OVS_NLERR(log, "ct_state flags %08x unsupported",
1216                                   ct_state);
1217                         return -EINVAL;
1218                 }
1219
1220                 SW_FLOW_KEY_PUT(match, ct_state, ct_state, is_mask);
1221                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_STATE);
1222         }
1223         if (*attrs & (1 << OVS_KEY_ATTR_CT_ZONE) &&
1224             ovs_ct_verify(net, OVS_KEY_ATTR_CT_ZONE)) {
1225                 u16 ct_zone = nla_get_u16(a[OVS_KEY_ATTR_CT_ZONE]);
1226
1227                 SW_FLOW_KEY_PUT(match, ct_zone, ct_zone, is_mask);
1228                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ZONE);
1229         }
1230         if (*attrs & (1 << OVS_KEY_ATTR_CT_MARK) &&
1231             ovs_ct_verify(net, OVS_KEY_ATTR_CT_MARK)) {
1232                 u32 mark = nla_get_u32(a[OVS_KEY_ATTR_CT_MARK]);
1233
1234                 SW_FLOW_KEY_PUT(match, ct.mark, mark, is_mask);
1235                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_MARK);
1236         }
1237         if (*attrs & (1 << OVS_KEY_ATTR_CT_LABELS) &&
1238             ovs_ct_verify(net, OVS_KEY_ATTR_CT_LABELS)) {
1239                 const struct ovs_key_ct_labels *cl;
1240
1241                 cl = nla_data(a[OVS_KEY_ATTR_CT_LABELS]);
1242                 SW_FLOW_KEY_MEMCPY(match, ct.labels, cl->ct_labels,
1243                                    sizeof(*cl), is_mask);
1244                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_LABELS);
1245         }
1246         if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4)) {
1247                 const struct ovs_key_ct_tuple_ipv4 *ct;
1248
1249                 ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4]);
1250
1251                 SW_FLOW_KEY_PUT(match, ipv4.ct_orig.src, ct->ipv4_src, is_mask);
1252                 SW_FLOW_KEY_PUT(match, ipv4.ct_orig.dst, ct->ipv4_dst, is_mask);
1253                 SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
1254                 SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
1255                 SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv4_proto, is_mask);
1256                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4);
1257         }
1258         if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)) {
1259                 const struct ovs_key_ct_tuple_ipv6 *ct;
1260
1261                 ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6]);
1262
1263                 SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.src, &ct->ipv6_src,
1264                                    sizeof(match->key->ipv6.ct_orig.src),
1265                                    is_mask);
1266                 SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.dst, &ct->ipv6_dst,
1267                                    sizeof(match->key->ipv6.ct_orig.dst),
1268                                    is_mask);
1269                 SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
1270                 SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
1271                 SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv6_proto, is_mask);
1272                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6);
1273         }
1274
1275         /* For layer 3 packets the Ethernet type is provided
1276          * and treated as metadata but no MAC addresses are provided.
1277          */
1278         if (!(*attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) &&
1279             (*attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)))
1280                 mac_proto = MAC_PROTO_NONE;
1281
1282         /* Always exact match mac_proto */
1283         SW_FLOW_KEY_PUT(match, mac_proto, is_mask ? 0xff : mac_proto, is_mask);
1284
1285         if (mac_proto == MAC_PROTO_NONE)
1286                 return parse_eth_type_from_nlattrs(match, attrs, a, is_mask,
1287                                                    log);
1288
1289         return 0;
1290 }
1291
1292 int nsh_hdr_from_nlattr(const struct nlattr *attr,
1293                         struct nshhdr *nh, size_t size)
1294 {
1295         struct nlattr *a;
1296         int rem;
1297         u8 flags = 0;
1298         u8 ttl = 0;
1299         int mdlen = 0;
1300
1301         /* validate_nsh has check this, so we needn't do duplicate check here
1302          */
1303         if (size < NSH_BASE_HDR_LEN)
1304                 return -ENOBUFS;
1305
1306         nla_for_each_nested(a, attr, rem) {
1307                 int type = nla_type(a);
1308
1309                 switch (type) {
1310                 case OVS_NSH_KEY_ATTR_BASE: {
1311                         const struct ovs_nsh_key_base *base = nla_data(a);
1312
1313                         flags = base->flags;
1314                         ttl = base->ttl;
1315                         nh->np = base->np;
1316                         nh->mdtype = base->mdtype;
1317                         nh->path_hdr = base->path_hdr;
1318                         break;
1319                 }
1320                 case OVS_NSH_KEY_ATTR_MD1:
1321                         mdlen = nla_len(a);
1322                         if (mdlen > size - NSH_BASE_HDR_LEN)
1323                                 return -ENOBUFS;
1324                         memcpy(&nh->md1, nla_data(a), mdlen);
1325                         break;
1326
1327                 case OVS_NSH_KEY_ATTR_MD2:
1328                         mdlen = nla_len(a);
1329                         if (mdlen > size - NSH_BASE_HDR_LEN)
1330                                 return -ENOBUFS;
1331                         memcpy(&nh->md2, nla_data(a), mdlen);
1332                         break;
1333
1334                 default:
1335                         return -EINVAL;
1336                 }
1337         }
1338
1339         /* nsh header length  = NSH_BASE_HDR_LEN + mdlen */
1340         nh->ver_flags_ttl_len = 0;
1341         nsh_set_flags_ttl_len(nh, flags, ttl, NSH_BASE_HDR_LEN + mdlen);
1342
1343         return 0;
1344 }
1345
1346 int nsh_key_from_nlattr(const struct nlattr *attr,
1347                         struct ovs_key_nsh *nsh, struct ovs_key_nsh *nsh_mask)
1348 {
1349         struct nlattr *a;
1350         int rem;
1351
1352         /* validate_nsh has check this, so we needn't do duplicate check here
1353          */
1354         nla_for_each_nested(a, attr, rem) {
1355                 int type = nla_type(a);
1356
1357                 switch (type) {
1358                 case OVS_NSH_KEY_ATTR_BASE: {
1359                         const struct ovs_nsh_key_base *base = nla_data(a);
1360                         const struct ovs_nsh_key_base *base_mask = base + 1;
1361
1362                         nsh->base = *base;
1363                         nsh_mask->base = *base_mask;
1364                         break;
1365                 }
1366                 case OVS_NSH_KEY_ATTR_MD1: {
1367                         const struct ovs_nsh_key_md1 *md1 = nla_data(a);
1368                         const struct ovs_nsh_key_md1 *md1_mask = md1 + 1;
1369
1370                         memcpy(nsh->context, md1->context, sizeof(*md1));
1371                         memcpy(nsh_mask->context, md1_mask->context,
1372                                sizeof(*md1_mask));
1373                         break;
1374                 }
1375                 case OVS_NSH_KEY_ATTR_MD2:
1376                         /* Not supported yet */
1377                         return -ENOTSUPP;
1378                 default:
1379                         return -EINVAL;
1380                 }
1381         }
1382
1383         return 0;
1384 }
1385
1386 static int nsh_key_put_from_nlattr(const struct nlattr *attr,
1387                                    struct sw_flow_match *match, bool is_mask,
1388                                    bool is_push_nsh, bool log)
1389 {
1390         struct nlattr *a;
1391         int rem;
1392         bool has_base = false;
1393         bool has_md1 = false;
1394         bool has_md2 = false;
1395         u8 mdtype = 0;
1396         int mdlen = 0;
1397
1398         if (WARN_ON(is_push_nsh && is_mask))
1399                 return -EINVAL;
1400
1401         nla_for_each_nested(a, attr, rem) {
1402                 int type = nla_type(a);
1403                 int i;
1404
1405                 if (type > OVS_NSH_KEY_ATTR_MAX) {
1406                         OVS_NLERR(log, "nsh attr %d is out of range max %d",
1407                                   type, OVS_NSH_KEY_ATTR_MAX);
1408                         return -EINVAL;
1409                 }
1410
1411                 if (!check_attr_len(nla_len(a),
1412                                     ovs_nsh_key_attr_lens[type].len)) {
1413                         OVS_NLERR(
1414                             log,
1415                             "nsh attr %d has unexpected len %d expected %d",
1416                             type,
1417                             nla_len(a),
1418                             ovs_nsh_key_attr_lens[type].len
1419                         );
1420                         return -EINVAL;
1421                 }
1422
1423                 switch (type) {
1424                 case OVS_NSH_KEY_ATTR_BASE: {
1425                         const struct ovs_nsh_key_base *base = nla_data(a);
1426
1427                         has_base = true;
1428                         mdtype = base->mdtype;
1429                         SW_FLOW_KEY_PUT(match, nsh.base.flags,
1430                                         base->flags, is_mask);
1431                         SW_FLOW_KEY_PUT(match, nsh.base.ttl,
1432                                         base->ttl, is_mask);
1433                         SW_FLOW_KEY_PUT(match, nsh.base.mdtype,
1434                                         base->mdtype, is_mask);
1435                         SW_FLOW_KEY_PUT(match, nsh.base.np,
1436                                         base->np, is_mask);
1437                         SW_FLOW_KEY_PUT(match, nsh.base.path_hdr,
1438                                         base->path_hdr, is_mask);
1439                         break;
1440                 }
1441                 case OVS_NSH_KEY_ATTR_MD1: {
1442                         const struct ovs_nsh_key_md1 *md1 = nla_data(a);
1443
1444                         has_md1 = true;
1445                         for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++)
1446                                 SW_FLOW_KEY_PUT(match, nsh.context[i],
1447                                                 md1->context[i], is_mask);
1448                         break;
1449                 }
1450                 case OVS_NSH_KEY_ATTR_MD2:
1451                         if (!is_push_nsh) /* Not supported MD type 2 yet */
1452                                 return -ENOTSUPP;
1453
1454                         has_md2 = true;
1455                         mdlen = nla_len(a);
1456                         if (mdlen > NSH_CTX_HDRS_MAX_LEN || mdlen <= 0) {
1457                                 OVS_NLERR(
1458                                     log,
1459                                     "Invalid MD length %d for MD type %d",
1460                                     mdlen,
1461                                     mdtype
1462                                 );
1463                                 return -EINVAL;
1464                         }
1465                         break;
1466                 default:
1467                         OVS_NLERR(log, "Unknown nsh attribute %d",
1468                                   type);
1469                         return -EINVAL;
1470                 }
1471         }
1472
1473         if (rem > 0) {
1474                 OVS_NLERR(log, "nsh attribute has %d unknown bytes.", rem);
1475                 return -EINVAL;
1476         }
1477
1478         if (has_md1 && has_md2) {
1479                 OVS_NLERR(
1480                     1,
1481                     "invalid nsh attribute: md1 and md2 are exclusive."
1482                 );
1483                 return -EINVAL;
1484         }
1485
1486         if (!is_mask) {
1487                 if ((has_md1 && mdtype != NSH_M_TYPE1) ||
1488                     (has_md2 && mdtype != NSH_M_TYPE2)) {
1489                         OVS_NLERR(1, "nsh attribute has unmatched MD type %d.",
1490                                   mdtype);
1491                         return -EINVAL;
1492                 }
1493
1494                 if (is_push_nsh &&
1495                     (!has_base || (!has_md1 && !has_md2))) {
1496                         OVS_NLERR(
1497                             1,
1498                             "push_nsh: missing base or metadata attributes"
1499                         );
1500                         return -EINVAL;
1501                 }
1502         }
1503
1504         return 0;
1505 }
1506
1507 static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
1508                                 u64 attrs, const struct nlattr **a,
1509                                 bool is_mask, bool log)
1510 {
1511         int err;
1512
1513         err = metadata_from_nlattrs(net, match, &attrs, a, is_mask, log);
1514         if (err)
1515                 return err;
1516
1517         if (attrs & (1 << OVS_KEY_ATTR_ETHERNET)) {
1518                 const struct ovs_key_ethernet *eth_key;
1519
1520                 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
1521                 SW_FLOW_KEY_MEMCPY(match, eth.src,
1522                                 eth_key->eth_src, ETH_ALEN, is_mask);
1523                 SW_FLOW_KEY_MEMCPY(match, eth.dst,
1524                                 eth_key->eth_dst, ETH_ALEN, is_mask);
1525                 attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET);
1526
1527                 if (attrs & (1 << OVS_KEY_ATTR_VLAN)) {
1528                         /* VLAN attribute is always parsed before getting here since it
1529                          * may occur multiple times.
1530                          */
1531                         OVS_NLERR(log, "VLAN attribute unexpected.");
1532                         return -EINVAL;
1533                 }
1534
1535                 if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
1536                         err = parse_eth_type_from_nlattrs(match, &attrs, a, is_mask,
1537                                                           log);
1538                         if (err)
1539                                 return err;
1540                 } else if (!is_mask) {
1541                         SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
1542                 }
1543         } else if (!match->key->eth.type) {
1544                 OVS_NLERR(log, "Either Ethernet header or EtherType is required.");
1545                 return -EINVAL;
1546         }
1547
1548         if (attrs & (1 << OVS_KEY_ATTR_IPV4)) {
1549                 const struct ovs_key_ipv4 *ipv4_key;
1550
1551                 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
1552                 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
1553                         OVS_NLERR(log, "IPv4 frag type %d is out of range max %d",
1554                                   ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
1555                         return -EINVAL;
1556                 }
1557                 SW_FLOW_KEY_PUT(match, ip.proto,
1558                                 ipv4_key->ipv4_proto, is_mask);
1559                 SW_FLOW_KEY_PUT(match, ip.tos,
1560                                 ipv4_key->ipv4_tos, is_mask);
1561                 SW_FLOW_KEY_PUT(match, ip.ttl,
1562                                 ipv4_key->ipv4_ttl, is_mask);
1563                 SW_FLOW_KEY_PUT(match, ip.frag,
1564                                 ipv4_key->ipv4_frag, is_mask);
1565                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
1566                                 ipv4_key->ipv4_src, is_mask);
1567                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
1568                                 ipv4_key->ipv4_dst, is_mask);
1569                 attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
1570         }
1571
1572         if (attrs & (1 << OVS_KEY_ATTR_IPV6)) {
1573                 const struct ovs_key_ipv6 *ipv6_key;
1574
1575                 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
1576                 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
1577                         OVS_NLERR(log, "IPv6 frag type %d is out of range max %d",
1578                                   ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
1579                         return -EINVAL;
1580                 }
1581
1582                 if (!is_mask && ipv6_key->ipv6_label & htonl(0xFFF00000)) {
1583                         OVS_NLERR(log, "IPv6 flow label %x is out of range (max=%x)",
1584                                   ntohl(ipv6_key->ipv6_label), (1 << 20) - 1);
1585                         return -EINVAL;
1586                 }
1587
1588                 SW_FLOW_KEY_PUT(match, ipv6.label,
1589                                 ipv6_key->ipv6_label, is_mask);
1590                 SW_FLOW_KEY_PUT(match, ip.proto,
1591                                 ipv6_key->ipv6_proto, is_mask);
1592                 SW_FLOW_KEY_PUT(match, ip.tos,
1593                                 ipv6_key->ipv6_tclass, is_mask);
1594                 SW_FLOW_KEY_PUT(match, ip.ttl,
1595                                 ipv6_key->ipv6_hlimit, is_mask);
1596                 SW_FLOW_KEY_PUT(match, ip.frag,
1597                                 ipv6_key->ipv6_frag, is_mask);
1598                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
1599                                 ipv6_key->ipv6_src,
1600                                 sizeof(match->key->ipv6.addr.src),
1601                                 is_mask);
1602                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
1603                                 ipv6_key->ipv6_dst,
1604                                 sizeof(match->key->ipv6.addr.dst),
1605                                 is_mask);
1606
1607                 attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
1608         }
1609
1610         if (attrs & (1ULL << OVS_KEY_ATTR_IPV6_EXTHDRS)) {
1611                 const struct ovs_key_ipv6_exthdrs *ipv6_exthdrs_key;
1612
1613                 ipv6_exthdrs_key = nla_data(a[OVS_KEY_ATTR_IPV6_EXTHDRS]);
1614
1615                 SW_FLOW_KEY_PUT(match, ipv6.exthdrs,
1616                                 ipv6_exthdrs_key->hdrs, is_mask);
1617
1618                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV6_EXTHDRS);
1619         }
1620
1621         if (attrs & (1 << OVS_KEY_ATTR_ARP)) {
1622                 const struct ovs_key_arp *arp_key;
1623
1624                 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
1625                 if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
1626                         OVS_NLERR(log, "Unknown ARP opcode (opcode=%d).",
1627                                   arp_key->arp_op);
1628                         return -EINVAL;
1629                 }
1630
1631                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
1632                                 arp_key->arp_sip, is_mask);
1633                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
1634                         arp_key->arp_tip, is_mask);
1635                 SW_FLOW_KEY_PUT(match, ip.proto,
1636                                 ntohs(arp_key->arp_op), is_mask);
1637                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
1638                                 arp_key->arp_sha, ETH_ALEN, is_mask);
1639                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
1640                                 arp_key->arp_tha, ETH_ALEN, is_mask);
1641
1642                 attrs &= ~(1 << OVS_KEY_ATTR_ARP);
1643         }
1644
1645         if (attrs & (1 << OVS_KEY_ATTR_NSH)) {
1646                 if (nsh_key_put_from_nlattr(a[OVS_KEY_ATTR_NSH], match,
1647                                             is_mask, false, log) < 0)
1648                         return -EINVAL;
1649                 attrs &= ~(1 << OVS_KEY_ATTR_NSH);
1650         }
1651
1652         if (attrs & (1 << OVS_KEY_ATTR_MPLS)) {
1653                 const struct ovs_key_mpls *mpls_key;
1654                 u32 hdr_len;
1655                 u32 label_count, label_count_mask, i;
1656
1657                 mpls_key = nla_data(a[OVS_KEY_ATTR_MPLS]);
1658                 hdr_len = nla_len(a[OVS_KEY_ATTR_MPLS]);
1659                 label_count = hdr_len / sizeof(struct ovs_key_mpls);
1660
1661                 if (label_count == 0 || label_count > MPLS_LABEL_DEPTH ||
1662                     hdr_len % sizeof(struct ovs_key_mpls))
1663                         return -EINVAL;
1664
1665                 label_count_mask =  GENMASK(label_count - 1, 0);
1666
1667                 for (i = 0 ; i < label_count; i++)
1668                         SW_FLOW_KEY_PUT(match, mpls.lse[i],
1669                                         mpls_key[i].mpls_lse, is_mask);
1670
1671                 SW_FLOW_KEY_PUT(match, mpls.num_labels_mask,
1672                                 label_count_mask, is_mask);
1673
1674                 attrs &= ~(1 << OVS_KEY_ATTR_MPLS);
1675          }
1676
1677         if (attrs & (1 << OVS_KEY_ATTR_TCP)) {
1678                 const struct ovs_key_tcp *tcp_key;
1679
1680                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
1681                 SW_FLOW_KEY_PUT(match, tp.src, tcp_key->tcp_src, is_mask);
1682                 SW_FLOW_KEY_PUT(match, tp.dst, tcp_key->tcp_dst, is_mask);
1683                 attrs &= ~(1 << OVS_KEY_ATTR_TCP);
1684         }
1685
1686         if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) {
1687                 SW_FLOW_KEY_PUT(match, tp.flags,
1688                                 nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
1689                                 is_mask);
1690                 attrs &= ~(1 << OVS_KEY_ATTR_TCP_FLAGS);
1691         }
1692
1693         if (attrs & (1 << OVS_KEY_ATTR_UDP)) {
1694                 const struct ovs_key_udp *udp_key;
1695
1696                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
1697                 SW_FLOW_KEY_PUT(match, tp.src, udp_key->udp_src, is_mask);
1698                 SW_FLOW_KEY_PUT(match, tp.dst, udp_key->udp_dst, is_mask);
1699                 attrs &= ~(1 << OVS_KEY_ATTR_UDP);
1700         }
1701
1702         if (attrs & (1 << OVS_KEY_ATTR_SCTP)) {
1703                 const struct ovs_key_sctp *sctp_key;
1704
1705                 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
1706                 SW_FLOW_KEY_PUT(match, tp.src, sctp_key->sctp_src, is_mask);
1707                 SW_FLOW_KEY_PUT(match, tp.dst, sctp_key->sctp_dst, is_mask);
1708                 attrs &= ~(1 << OVS_KEY_ATTR_SCTP);
1709         }
1710
1711         if (attrs & (1 << OVS_KEY_ATTR_ICMP)) {
1712                 const struct ovs_key_icmp *icmp_key;
1713
1714                 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
1715                 SW_FLOW_KEY_PUT(match, tp.src,
1716                                 htons(icmp_key->icmp_type), is_mask);
1717                 SW_FLOW_KEY_PUT(match, tp.dst,
1718                                 htons(icmp_key->icmp_code), is_mask);
1719                 attrs &= ~(1 << OVS_KEY_ATTR_ICMP);
1720         }
1721
1722         if (attrs & (1 << OVS_KEY_ATTR_ICMPV6)) {
1723                 const struct ovs_key_icmpv6 *icmpv6_key;
1724
1725                 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
1726                 SW_FLOW_KEY_PUT(match, tp.src,
1727                                 htons(icmpv6_key->icmpv6_type), is_mask);
1728                 SW_FLOW_KEY_PUT(match, tp.dst,
1729                                 htons(icmpv6_key->icmpv6_code), is_mask);
1730                 attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6);
1731         }
1732
1733         if (attrs & (1 << OVS_KEY_ATTR_ND)) {
1734                 const struct ovs_key_nd *nd_key;
1735
1736                 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
1737                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
1738                         nd_key->nd_target,
1739                         sizeof(match->key->ipv6.nd.target),
1740                         is_mask);
1741                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
1742                         nd_key->nd_sll, ETH_ALEN, is_mask);
1743                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
1744                                 nd_key->nd_tll, ETH_ALEN, is_mask);
1745                 attrs &= ~(1 << OVS_KEY_ATTR_ND);
1746         }
1747
1748         if (attrs != 0) {
1749                 OVS_NLERR(log, "Unknown key attributes %llx",
1750                           (unsigned long long)attrs);
1751                 return -EINVAL;
1752         }
1753
1754         return 0;
1755 }
1756
1757 static void nlattr_set(struct nlattr *attr, u8 val,
1758                        const struct ovs_len_tbl *tbl)
1759 {
1760         struct nlattr *nla;
1761         int rem;
1762
1763         /* The nlattr stream should already have been validated */
1764         nla_for_each_nested(nla, attr, rem) {
1765                 if (tbl[nla_type(nla)].len == OVS_ATTR_NESTED)
1766                         nlattr_set(nla, val, tbl[nla_type(nla)].next ? : tbl);
1767                 else
1768                         memset(nla_data(nla), val, nla_len(nla));
1769
1770                 if (nla_type(nla) == OVS_KEY_ATTR_CT_STATE)
1771                         *(u32 *)nla_data(nla) &= CT_SUPPORTED_MASK;
1772         }
1773 }
1774
1775 static void mask_set_nlattr(struct nlattr *attr, u8 val)
1776 {
1777         nlattr_set(attr, val, ovs_key_lens);
1778 }
1779
1780 /**
1781  * ovs_nla_get_match - parses Netlink attributes into a flow key and
1782  * mask. In case the 'mask' is NULL, the flow is treated as exact match
1783  * flow. Otherwise, it is treated as a wildcarded flow, except the mask
1784  * does not include any don't care bit.
1785  * @net: Used to determine per-namespace field support.
1786  * @match: receives the extracted flow match information.
1787  * @nla_key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1788  * sequence. The fields should of the packet that triggered the creation
1789  * of this flow.
1790  * @nla_mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_*
1791  * Netlink attribute specifies the mask field of the wildcarded flow.
1792  * @log: Boolean to allow kernel error logging.  Normally true, but when
1793  * probing for feature compatibility this should be passed in as false to
1794  * suppress unnecessary error logging.
1795  */
1796 int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
1797                       const struct nlattr *nla_key,
1798                       const struct nlattr *nla_mask,
1799                       bool log)
1800 {
1801         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1802         struct nlattr *newmask = NULL;
1803         u64 key_attrs = 0;
1804         u64 mask_attrs = 0;
1805         int err;
1806
1807         err = parse_flow_nlattrs(nla_key, a, &key_attrs, log);
1808         if (err)
1809                 return err;
1810
1811         err = parse_vlan_from_nlattrs(match, &key_attrs, a, false, log);
1812         if (err)
1813                 return err;
1814
1815         err = ovs_key_from_nlattrs(net, match, key_attrs, a, false, log);
1816         if (err)
1817                 return err;
1818
1819         if (match->mask) {
1820                 if (!nla_mask) {
1821                         /* Create an exact match mask. We need to set to 0xff
1822                          * all the 'match->mask' fields that have been touched
1823                          * in 'match->key'. We cannot simply memset
1824                          * 'match->mask', because padding bytes and fields not
1825                          * specified in 'match->key' should be left to 0.
1826                          * Instead, we use a stream of netlink attributes,
1827                          * copied from 'key' and set to 0xff.
1828                          * ovs_key_from_nlattrs() will take care of filling
1829                          * 'match->mask' appropriately.
1830                          */
1831                         newmask = kmemdup(nla_key,
1832                                           nla_total_size(nla_len(nla_key)),
1833                                           GFP_KERNEL);
1834                         if (!newmask)
1835                                 return -ENOMEM;
1836
1837                         mask_set_nlattr(newmask, 0xff);
1838
1839                         /* The userspace does not send tunnel attributes that
1840                          * are 0, but we should not wildcard them nonetheless.
1841                          */
1842                         if (match->key->tun_proto)
1843                                 SW_FLOW_KEY_MEMSET_FIELD(match, tun_key,
1844                                                          0xff, true);
1845
1846                         nla_mask = newmask;
1847                 }
1848
1849                 err = parse_flow_mask_nlattrs(nla_mask, a, &mask_attrs, log);
1850                 if (err)
1851                         goto free_newmask;
1852
1853                 /* Always match on tci. */
1854                 SW_FLOW_KEY_PUT(match, eth.vlan.tci, htons(0xffff), true);
1855                 SW_FLOW_KEY_PUT(match, eth.cvlan.tci, htons(0xffff), true);
1856
1857                 err = parse_vlan_from_nlattrs(match, &mask_attrs, a, true, log);
1858                 if (err)
1859                         goto free_newmask;
1860
1861                 err = ovs_key_from_nlattrs(net, match, mask_attrs, a, true,
1862                                            log);
1863                 if (err)
1864                         goto free_newmask;
1865         }
1866
1867         if (!match_validate(match, key_attrs, mask_attrs, log))
1868                 err = -EINVAL;
1869
1870 free_newmask:
1871         kfree(newmask);
1872         return err;
1873 }
1874
1875 static size_t get_ufid_len(const struct nlattr *attr, bool log)
1876 {
1877         size_t len;
1878
1879         if (!attr)
1880                 return 0;
1881
1882         len = nla_len(attr);
1883         if (len < 1 || len > MAX_UFID_LENGTH) {
1884                 OVS_NLERR(log, "ufid size %u bytes exceeds the range (1, %d)",
1885                           nla_len(attr), MAX_UFID_LENGTH);
1886                 return 0;
1887         }
1888
1889         return len;
1890 }
1891
1892 /* Initializes 'flow->ufid', returning true if 'attr' contains a valid UFID,
1893  * or false otherwise.
1894  */
1895 bool ovs_nla_get_ufid(struct sw_flow_id *sfid, const struct nlattr *attr,
1896                       bool log)
1897 {
1898         sfid->ufid_len = get_ufid_len(attr, log);
1899         if (sfid->ufid_len)
1900                 memcpy(sfid->ufid, nla_data(attr), sfid->ufid_len);
1901
1902         return sfid->ufid_len;
1903 }
1904
1905 int ovs_nla_get_identifier(struct sw_flow_id *sfid, const struct nlattr *ufid,
1906                            const struct sw_flow_key *key, bool log)
1907 {
1908         struct sw_flow_key *new_key;
1909
1910         if (ovs_nla_get_ufid(sfid, ufid, log))
1911                 return 0;
1912
1913         /* If UFID was not provided, use unmasked key. */
1914         new_key = kmalloc(sizeof(*new_key), GFP_KERNEL);
1915         if (!new_key)
1916                 return -ENOMEM;
1917         memcpy(new_key, key, sizeof(*key));
1918         sfid->unmasked_key = new_key;
1919
1920         return 0;
1921 }
1922
1923 u32 ovs_nla_get_ufid_flags(const struct nlattr *attr)
1924 {
1925         return attr ? nla_get_u32(attr) : 0;
1926 }
1927
1928 /**
1929  * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
1930  * @net: Network namespace.
1931  * @key: Receives extracted in_port, priority, tun_key, skb_mark and conntrack
1932  * metadata.
1933  * @a: Array of netlink attributes holding parsed %OVS_KEY_ATTR_* Netlink
1934  * attributes.
1935  * @attrs: Bit mask for the netlink attributes included in @a.
1936  * @log: Boolean to allow kernel error logging.  Normally true, but when
1937  * probing for feature compatibility this should be passed in as false to
1938  * suppress unnecessary error logging.
1939  *
1940  * This parses a series of Netlink attributes that form a flow key, which must
1941  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
1942  * get the metadata, that is, the parts of the flow key that cannot be
1943  * extracted from the packet itself.
1944  *
1945  * This must be called before the packet key fields are filled in 'key'.
1946  */
1947
1948 int ovs_nla_get_flow_metadata(struct net *net,
1949                               const struct nlattr *a[OVS_KEY_ATTR_MAX + 1],
1950                               u64 attrs, struct sw_flow_key *key, bool log)
1951 {
1952         struct sw_flow_match match;
1953
1954         memset(&match, 0, sizeof(match));
1955         match.key = key;
1956
1957         key->ct_state = 0;
1958         key->ct_zone = 0;
1959         key->ct_orig_proto = 0;
1960         memset(&key->ct, 0, sizeof(key->ct));
1961         memset(&key->ipv4.ct_orig, 0, sizeof(key->ipv4.ct_orig));
1962         memset(&key->ipv6.ct_orig, 0, sizeof(key->ipv6.ct_orig));
1963
1964         key->phy.in_port = DP_MAX_PORTS;
1965
1966         return metadata_from_nlattrs(net, &match, &attrs, a, false, log);
1967 }
1968
1969 static int ovs_nla_put_vlan(struct sk_buff *skb, const struct vlan_head *vh,
1970                             bool is_mask)
1971 {
1972         __be16 eth_type = !is_mask ? vh->tpid : htons(0xffff);
1973
1974         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
1975             nla_put_be16(skb, OVS_KEY_ATTR_VLAN, vh->tci))
1976                 return -EMSGSIZE;
1977         return 0;
1978 }
1979
1980 static int nsh_key_to_nlattr(const struct ovs_key_nsh *nsh, bool is_mask,
1981                              struct sk_buff *skb)
1982 {
1983         struct nlattr *start;
1984
1985         start = nla_nest_start_noflag(skb, OVS_KEY_ATTR_NSH);
1986         if (!start)
1987                 return -EMSGSIZE;
1988
1989         if (nla_put(skb, OVS_NSH_KEY_ATTR_BASE, sizeof(nsh->base), &nsh->base))
1990                 goto nla_put_failure;
1991
1992         if (is_mask || nsh->base.mdtype == NSH_M_TYPE1) {
1993                 if (nla_put(skb, OVS_NSH_KEY_ATTR_MD1,
1994                             sizeof(nsh->context), nsh->context))
1995                         goto nla_put_failure;
1996         }
1997
1998         /* Don't support MD type 2 yet */
1999
2000         nla_nest_end(skb, start);
2001
2002         return 0;
2003
2004 nla_put_failure:
2005         return -EMSGSIZE;
2006 }
2007
2008 static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
2009                              const struct sw_flow_key *output, bool is_mask,
2010                              struct sk_buff *skb)
2011 {
2012         struct ovs_key_ethernet *eth_key;
2013         struct nlattr *nla;
2014         struct nlattr *encap = NULL;
2015         struct nlattr *in_encap = NULL;
2016
2017         if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id))
2018                 goto nla_put_failure;
2019
2020         if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash))
2021                 goto nla_put_failure;
2022
2023         if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
2024                 goto nla_put_failure;
2025
2026         if ((swkey->tun_proto || is_mask)) {
2027                 const void *opts = NULL;
2028
2029                 if (output->tun_key.tun_flags & TUNNEL_OPTIONS_PRESENT)
2030                         opts = TUN_METADATA_OPTS(output, swkey->tun_opts_len);
2031
2032                 if (ip_tun_to_nlattr(skb, &output->tun_key, opts,
2033                                      swkey->tun_opts_len, swkey->tun_proto, 0))
2034                         goto nla_put_failure;
2035         }
2036
2037         if (swkey->phy.in_port == DP_MAX_PORTS) {
2038                 if (is_mask && (output->phy.in_port == 0xffff))
2039                         if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
2040                                 goto nla_put_failure;
2041         } else {
2042                 u16 upper_u16;
2043                 upper_u16 = !is_mask ? 0 : 0xffff;
2044
2045                 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
2046                                 (upper_u16 << 16) | output->phy.in_port))
2047                         goto nla_put_failure;
2048         }
2049
2050         if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
2051                 goto nla_put_failure;
2052
2053         if (ovs_ct_put_key(swkey, output, skb))
2054                 goto nla_put_failure;
2055
2056         if (ovs_key_mac_proto(swkey) == MAC_PROTO_ETHERNET) {
2057                 nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
2058                 if (!nla)
2059                         goto nla_put_failure;
2060
2061                 eth_key = nla_data(nla);
2062                 ether_addr_copy(eth_key->eth_src, output->eth.src);
2063                 ether_addr_copy(eth_key->eth_dst, output->eth.dst);
2064
2065                 if (swkey->eth.vlan.tci || eth_type_vlan(swkey->eth.type)) {
2066                         if (ovs_nla_put_vlan(skb, &output->eth.vlan, is_mask))
2067                                 goto nla_put_failure;
2068                         encap = nla_nest_start_noflag(skb, OVS_KEY_ATTR_ENCAP);
2069                         if (!swkey->eth.vlan.tci)
2070                                 goto unencap;
2071
2072                         if (swkey->eth.cvlan.tci || eth_type_vlan(swkey->eth.type)) {
2073                                 if (ovs_nla_put_vlan(skb, &output->eth.cvlan, is_mask))
2074                                         goto nla_put_failure;
2075                                 in_encap = nla_nest_start_noflag(skb,
2076                                                                  OVS_KEY_ATTR_ENCAP);
2077                                 if (!swkey->eth.cvlan.tci)
2078                                         goto unencap;
2079                         }
2080                 }
2081
2082                 if (swkey->eth.type == htons(ETH_P_802_2)) {
2083                         /*
2084                         * Ethertype 802.2 is represented in the netlink with omitted
2085                         * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
2086                         * 0xffff in the mask attribute.  Ethertype can also
2087                         * be wildcarded.
2088                         */
2089                         if (is_mask && output->eth.type)
2090                                 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
2091                                                         output->eth.type))
2092                                         goto nla_put_failure;
2093                         goto unencap;
2094                 }
2095         }
2096
2097         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
2098                 goto nla_put_failure;
2099
2100         if (eth_type_vlan(swkey->eth.type)) {
2101                 /* There are 3 VLAN tags, we don't know anything about the rest
2102                  * of the packet, so truncate here.
2103                  */
2104                 WARN_ON_ONCE(!(encap && in_encap));
2105                 goto unencap;
2106         }
2107
2108         if (swkey->eth.type == htons(ETH_P_IP)) {
2109                 struct ovs_key_ipv4 *ipv4_key;
2110
2111                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
2112                 if (!nla)
2113                         goto nla_put_failure;
2114                 ipv4_key = nla_data(nla);
2115                 ipv4_key->ipv4_src = output->ipv4.addr.src;
2116                 ipv4_key->ipv4_dst = output->ipv4.addr.dst;
2117                 ipv4_key->ipv4_proto = output->ip.proto;
2118                 ipv4_key->ipv4_tos = output->ip.tos;
2119                 ipv4_key->ipv4_ttl = output->ip.ttl;
2120                 ipv4_key->ipv4_frag = output->ip.frag;
2121         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
2122                 struct ovs_key_ipv6 *ipv6_key;
2123                 struct ovs_key_ipv6_exthdrs *ipv6_exthdrs_key;
2124
2125                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
2126                 if (!nla)
2127                         goto nla_put_failure;
2128                 ipv6_key = nla_data(nla);
2129                 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
2130                                 sizeof(ipv6_key->ipv6_src));
2131                 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
2132                                 sizeof(ipv6_key->ipv6_dst));
2133                 ipv6_key->ipv6_label = output->ipv6.label;
2134                 ipv6_key->ipv6_proto = output->ip.proto;
2135                 ipv6_key->ipv6_tclass = output->ip.tos;
2136                 ipv6_key->ipv6_hlimit = output->ip.ttl;
2137                 ipv6_key->ipv6_frag = output->ip.frag;
2138
2139                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6_EXTHDRS,
2140                                   sizeof(*ipv6_exthdrs_key));
2141                 if (!nla)
2142                         goto nla_put_failure;
2143                 ipv6_exthdrs_key = nla_data(nla);
2144                 ipv6_exthdrs_key->hdrs = output->ipv6.exthdrs;
2145         } else if (swkey->eth.type == htons(ETH_P_NSH)) {
2146                 if (nsh_key_to_nlattr(&output->nsh, is_mask, skb))
2147                         goto nla_put_failure;
2148         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
2149                    swkey->eth.type == htons(ETH_P_RARP)) {
2150                 struct ovs_key_arp *arp_key;
2151
2152                 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
2153                 if (!nla)
2154                         goto nla_put_failure;
2155                 arp_key = nla_data(nla);
2156                 memset(arp_key, 0, sizeof(struct ovs_key_arp));
2157                 arp_key->arp_sip = output->ipv4.addr.src;
2158                 arp_key->arp_tip = output->ipv4.addr.dst;
2159                 arp_key->arp_op = htons(output->ip.proto);
2160                 ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha);
2161                 ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha);
2162         } else if (eth_p_mpls(swkey->eth.type)) {
2163                 u8 i, num_labels;
2164                 struct ovs_key_mpls *mpls_key;
2165
2166                 num_labels = hweight_long(output->mpls.num_labels_mask);
2167                 nla = nla_reserve(skb, OVS_KEY_ATTR_MPLS,
2168                                   num_labels * sizeof(*mpls_key));
2169                 if (!nla)
2170                         goto nla_put_failure;
2171
2172                 mpls_key = nla_data(nla);
2173                 for (i = 0; i < num_labels; i++)
2174                         mpls_key[i].mpls_lse = output->mpls.lse[i];
2175         }
2176
2177         if ((swkey->eth.type == htons(ETH_P_IP) ||
2178              swkey->eth.type == htons(ETH_P_IPV6)) &&
2179              swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
2180
2181                 if (swkey->ip.proto == IPPROTO_TCP) {
2182                         struct ovs_key_tcp *tcp_key;
2183
2184                         nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
2185                         if (!nla)
2186                                 goto nla_put_failure;
2187                         tcp_key = nla_data(nla);
2188                         tcp_key->tcp_src = output->tp.src;
2189                         tcp_key->tcp_dst = output->tp.dst;
2190                         if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
2191                                          output->tp.flags))
2192                                 goto nla_put_failure;
2193                 } else if (swkey->ip.proto == IPPROTO_UDP) {
2194                         struct ovs_key_udp *udp_key;
2195
2196                         nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
2197                         if (!nla)
2198                                 goto nla_put_failure;
2199                         udp_key = nla_data(nla);
2200                         udp_key->udp_src = output->tp.src;
2201                         udp_key->udp_dst = output->tp.dst;
2202                 } else if (swkey->ip.proto == IPPROTO_SCTP) {
2203                         struct ovs_key_sctp *sctp_key;
2204
2205                         nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
2206                         if (!nla)
2207                                 goto nla_put_failure;
2208                         sctp_key = nla_data(nla);
2209                         sctp_key->sctp_src = output->tp.src;
2210                         sctp_key->sctp_dst = output->tp.dst;
2211                 } else if (swkey->eth.type == htons(ETH_P_IP) &&
2212                            swkey->ip.proto == IPPROTO_ICMP) {
2213                         struct ovs_key_icmp *icmp_key;
2214
2215                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
2216                         if (!nla)
2217                                 goto nla_put_failure;
2218                         icmp_key = nla_data(nla);
2219                         icmp_key->icmp_type = ntohs(output->tp.src);
2220                         icmp_key->icmp_code = ntohs(output->tp.dst);
2221                 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
2222                            swkey->ip.proto == IPPROTO_ICMPV6) {
2223                         struct ovs_key_icmpv6 *icmpv6_key;
2224
2225                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
2226                                                 sizeof(*icmpv6_key));
2227                         if (!nla)
2228                                 goto nla_put_failure;
2229                         icmpv6_key = nla_data(nla);
2230                         icmpv6_key->icmpv6_type = ntohs(output->tp.src);
2231                         icmpv6_key->icmpv6_code = ntohs(output->tp.dst);
2232
2233                         if (swkey->tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) ||
2234                             swkey->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
2235                                 struct ovs_key_nd *nd_key;
2236
2237                                 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
2238                                 if (!nla)
2239                                         goto nla_put_failure;
2240                                 nd_key = nla_data(nla);
2241                                 memcpy(nd_key->nd_target, &output->ipv6.nd.target,
2242                                                         sizeof(nd_key->nd_target));
2243                                 ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll);
2244                                 ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll);
2245                         }
2246                 }
2247         }
2248
2249 unencap:
2250         if (in_encap)
2251                 nla_nest_end(skb, in_encap);
2252         if (encap)
2253                 nla_nest_end(skb, encap);
2254
2255         return 0;
2256
2257 nla_put_failure:
2258         return -EMSGSIZE;
2259 }
2260
2261 int ovs_nla_put_key(const struct sw_flow_key *swkey,
2262                     const struct sw_flow_key *output, int attr, bool is_mask,
2263                     struct sk_buff *skb)
2264 {
2265         int err;
2266         struct nlattr *nla;
2267
2268         nla = nla_nest_start_noflag(skb, attr);
2269         if (!nla)
2270                 return -EMSGSIZE;
2271         err = __ovs_nla_put_key(swkey, output, is_mask, skb);
2272         if (err)
2273                 return err;
2274         nla_nest_end(skb, nla);
2275
2276         return 0;
2277 }
2278
2279 /* Called with ovs_mutex or RCU read lock. */
2280 int ovs_nla_put_identifier(const struct sw_flow *flow, struct sk_buff *skb)
2281 {
2282         if (ovs_identifier_is_ufid(&flow->id))
2283                 return nla_put(skb, OVS_FLOW_ATTR_UFID, flow->id.ufid_len,
2284                                flow->id.ufid);
2285
2286         return ovs_nla_put_key(flow->id.unmasked_key, flow->id.unmasked_key,
2287                                OVS_FLOW_ATTR_KEY, false, skb);
2288 }
2289
2290 /* Called with ovs_mutex or RCU read lock. */
2291 int ovs_nla_put_masked_key(const struct sw_flow *flow, struct sk_buff *skb)
2292 {
2293         return ovs_nla_put_key(&flow->key, &flow->key,
2294                                 OVS_FLOW_ATTR_KEY, false, skb);
2295 }
2296
2297 /* Called with ovs_mutex or RCU read lock. */
2298 int ovs_nla_put_mask(const struct sw_flow *flow, struct sk_buff *skb)
2299 {
2300         return ovs_nla_put_key(&flow->key, &flow->mask->key,
2301                                 OVS_FLOW_ATTR_MASK, true, skb);
2302 }
2303
2304 #define MAX_ACTIONS_BUFSIZE     (32 * 1024)
2305
2306 static struct sw_flow_actions *nla_alloc_flow_actions(int size)
2307 {
2308         struct sw_flow_actions *sfa;
2309
2310         WARN_ON_ONCE(size > MAX_ACTIONS_BUFSIZE);
2311
2312         sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
2313         if (!sfa)
2314                 return ERR_PTR(-ENOMEM);
2315
2316         sfa->actions_len = 0;
2317         return sfa;
2318 }
2319
2320 static void ovs_nla_free_nested_actions(const struct nlattr *actions, int len);
2321
2322 static void ovs_nla_free_check_pkt_len_action(const struct nlattr *action)
2323 {
2324         const struct nlattr *a;
2325         int rem;
2326
2327         nla_for_each_nested(a, action, rem) {
2328                 switch (nla_type(a)) {
2329                 case OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL:
2330                 case OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER:
2331                         ovs_nla_free_nested_actions(nla_data(a), nla_len(a));
2332                         break;
2333                 }
2334         }
2335 }
2336
2337 static void ovs_nla_free_clone_action(const struct nlattr *action)
2338 {
2339         const struct nlattr *a = nla_data(action);
2340         int rem = nla_len(action);
2341
2342         switch (nla_type(a)) {
2343         case OVS_CLONE_ATTR_EXEC:
2344                 /* The real list of actions follows this attribute. */
2345                 a = nla_next(a, &rem);
2346                 ovs_nla_free_nested_actions(a, rem);
2347                 break;
2348         }
2349 }
2350
2351 static void ovs_nla_free_dec_ttl_action(const struct nlattr *action)
2352 {
2353         const struct nlattr *a = nla_data(action);
2354
2355         switch (nla_type(a)) {
2356         case OVS_DEC_TTL_ATTR_ACTION:
2357                 ovs_nla_free_nested_actions(nla_data(a), nla_len(a));
2358                 break;
2359         }
2360 }
2361
2362 static void ovs_nla_free_sample_action(const struct nlattr *action)
2363 {
2364         const struct nlattr *a = nla_data(action);
2365         int rem = nla_len(action);
2366
2367         switch (nla_type(a)) {
2368         case OVS_SAMPLE_ATTR_ARG:
2369                 /* The real list of actions follows this attribute. */
2370                 a = nla_next(a, &rem);
2371                 ovs_nla_free_nested_actions(a, rem);
2372                 break;
2373         }
2374 }
2375
2376 static void ovs_nla_free_set_action(const struct nlattr *a)
2377 {
2378         const struct nlattr *ovs_key = nla_data(a);
2379         struct ovs_tunnel_info *ovs_tun;
2380
2381         switch (nla_type(ovs_key)) {
2382         case OVS_KEY_ATTR_TUNNEL_INFO:
2383                 ovs_tun = nla_data(ovs_key);
2384                 dst_release((struct dst_entry *)ovs_tun->tun_dst);
2385                 break;
2386         }
2387 }
2388
2389 static void ovs_nla_free_nested_actions(const struct nlattr *actions, int len)
2390 {
2391         const struct nlattr *a;
2392         int rem;
2393
2394         /* Whenever new actions are added, the need to update this
2395          * function should be considered.
2396          */
2397         BUILD_BUG_ON(OVS_ACTION_ATTR_MAX != 23);
2398
2399         if (!actions)
2400                 return;
2401
2402         nla_for_each_attr(a, actions, len, rem) {
2403                 switch (nla_type(a)) {
2404                 case OVS_ACTION_ATTR_CHECK_PKT_LEN:
2405                         ovs_nla_free_check_pkt_len_action(a);
2406                         break;
2407
2408                 case OVS_ACTION_ATTR_CLONE:
2409                         ovs_nla_free_clone_action(a);
2410                         break;
2411
2412                 case OVS_ACTION_ATTR_CT:
2413                         ovs_ct_free_action(a);
2414                         break;
2415
2416                 case OVS_ACTION_ATTR_DEC_TTL:
2417                         ovs_nla_free_dec_ttl_action(a);
2418                         break;
2419
2420                 case OVS_ACTION_ATTR_SAMPLE:
2421                         ovs_nla_free_sample_action(a);
2422                         break;
2423
2424                 case OVS_ACTION_ATTR_SET:
2425                         ovs_nla_free_set_action(a);
2426                         break;
2427                 }
2428         }
2429 }
2430
2431 void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
2432 {
2433         if (!sf_acts)
2434                 return;
2435
2436         ovs_nla_free_nested_actions(sf_acts->actions, sf_acts->actions_len);
2437         kfree(sf_acts);
2438 }
2439
2440 static void __ovs_nla_free_flow_actions(struct rcu_head *head)
2441 {
2442         ovs_nla_free_flow_actions(container_of(head, struct sw_flow_actions, rcu));
2443 }
2444
2445 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
2446  * The caller must hold rcu_read_lock for this to be sensible. */
2447 void ovs_nla_free_flow_actions_rcu(struct sw_flow_actions *sf_acts)
2448 {
2449         call_rcu(&sf_acts->rcu, __ovs_nla_free_flow_actions);
2450 }
2451
2452 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
2453                                        int attr_len, bool log)
2454 {
2455
2456         struct sw_flow_actions *acts;
2457         int new_acts_size;
2458         size_t req_size = NLA_ALIGN(attr_len);
2459         int next_offset = offsetof(struct sw_flow_actions, actions) +
2460                                         (*sfa)->actions_len;
2461
2462         if (req_size <= (ksize(*sfa) - next_offset))
2463                 goto out;
2464
2465         new_acts_size = max(next_offset + req_size, ksize(*sfa) * 2);
2466
2467         if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
2468                 if ((next_offset + req_size) > MAX_ACTIONS_BUFSIZE) {
2469                         OVS_NLERR(log, "Flow action size exceeds max %u",
2470                                   MAX_ACTIONS_BUFSIZE);
2471                         return ERR_PTR(-EMSGSIZE);
2472                 }
2473                 new_acts_size = MAX_ACTIONS_BUFSIZE;
2474         }
2475
2476         acts = nla_alloc_flow_actions(new_acts_size);
2477         if (IS_ERR(acts))
2478                 return (void *)acts;
2479
2480         memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
2481         acts->actions_len = (*sfa)->actions_len;
2482         acts->orig_len = (*sfa)->orig_len;
2483         kfree(*sfa);
2484         *sfa = acts;
2485
2486 out:
2487         (*sfa)->actions_len += req_size;
2488         return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
2489 }
2490
2491 static struct nlattr *__add_action(struct sw_flow_actions **sfa,
2492                                    int attrtype, void *data, int len, bool log)
2493 {
2494         struct nlattr *a;
2495
2496         a = reserve_sfa_size(sfa, nla_attr_size(len), log);
2497         if (IS_ERR(a))
2498                 return a;
2499
2500         a->nla_type = attrtype;
2501         a->nla_len = nla_attr_size(len);
2502
2503         if (data)
2504                 memcpy(nla_data(a), data, len);
2505         memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
2506
2507         return a;
2508 }
2509
2510 int ovs_nla_add_action(struct sw_flow_actions **sfa, int attrtype, void *data,
2511                        int len, bool log)
2512 {
2513         struct nlattr *a;
2514
2515         a = __add_action(sfa, attrtype, data, len, log);
2516
2517         return PTR_ERR_OR_ZERO(a);
2518 }
2519
2520 static inline int add_nested_action_start(struct sw_flow_actions **sfa,
2521                                           int attrtype, bool log)
2522 {
2523         int used = (*sfa)->actions_len;
2524         int err;
2525
2526         err = ovs_nla_add_action(sfa, attrtype, NULL, 0, log);
2527         if (err)
2528                 return err;
2529
2530         return used;
2531 }
2532
2533 static inline void add_nested_action_end(struct sw_flow_actions *sfa,
2534                                          int st_offset)
2535 {
2536         struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
2537                                                                st_offset);
2538
2539         a->nla_len = sfa->actions_len - st_offset;
2540 }
2541
2542 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
2543                                   const struct sw_flow_key *key,
2544                                   struct sw_flow_actions **sfa,
2545                                   __be16 eth_type, __be16 vlan_tci,
2546                                   u32 mpls_label_count, bool log);
2547
2548 static int validate_and_copy_sample(struct net *net, const struct nlattr *attr,
2549                                     const struct sw_flow_key *key,
2550                                     struct sw_flow_actions **sfa,
2551                                     __be16 eth_type, __be16 vlan_tci,
2552                                     u32 mpls_label_count, bool log, bool last)
2553 {
2554         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
2555         const struct nlattr *probability, *actions;
2556         const struct nlattr *a;
2557         int rem, start, err;
2558         struct sample_arg arg;
2559
2560         memset(attrs, 0, sizeof(attrs));
2561         nla_for_each_nested(a, attr, rem) {
2562                 int type = nla_type(a);
2563                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
2564                         return -EINVAL;
2565                 attrs[type] = a;
2566         }
2567         if (rem)
2568                 return -EINVAL;
2569
2570         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
2571         if (!probability || nla_len(probability) != sizeof(u32))
2572                 return -EINVAL;
2573
2574         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
2575         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
2576                 return -EINVAL;
2577
2578         /* validation done, copy sample action. */
2579         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE, log);
2580         if (start < 0)
2581                 return start;
2582
2583         /* When both skb and flow may be changed, put the sample
2584          * into a deferred fifo. On the other hand, if only skb
2585          * may be modified, the actions can be executed in place.
2586          *
2587          * Do this analysis at the flow installation time.
2588          * Set 'clone_action->exec' to true if the actions can be
2589          * executed without being deferred.
2590          *
2591          * If the sample is the last action, it can always be excuted
2592          * rather than deferred.
2593          */
2594         arg.exec = last || !actions_may_change_flow(actions);
2595         arg.probability = nla_get_u32(probability);
2596
2597         err = ovs_nla_add_action(sfa, OVS_SAMPLE_ATTR_ARG, &arg, sizeof(arg),
2598                                  log);
2599         if (err)
2600                 return err;
2601
2602         err = __ovs_nla_copy_actions(net, actions, key, sfa,
2603                                      eth_type, vlan_tci, mpls_label_count, log);
2604
2605         if (err)
2606                 return err;
2607
2608         add_nested_action_end(*sfa, start);
2609
2610         return 0;
2611 }
2612
2613 static int validate_and_copy_dec_ttl(struct net *net,
2614                                      const struct nlattr *attr,
2615                                      const struct sw_flow_key *key,
2616                                      struct sw_flow_actions **sfa,
2617                                      __be16 eth_type, __be16 vlan_tci,
2618                                      u32 mpls_label_count, bool log)
2619 {
2620         const struct nlattr *attrs[OVS_DEC_TTL_ATTR_MAX + 1];
2621         int start, action_start, err, rem;
2622         const struct nlattr *a, *actions;
2623
2624         memset(attrs, 0, sizeof(attrs));
2625         nla_for_each_nested(a, attr, rem) {
2626                 int type = nla_type(a);
2627
2628                 /* Ignore unknown attributes to be future proof. */
2629                 if (type > OVS_DEC_TTL_ATTR_MAX)
2630                         continue;
2631
2632                 if (!type || attrs[type]) {
2633                         OVS_NLERR(log, "Duplicate or invalid key (type %d).",
2634                                   type);
2635                         return -EINVAL;
2636                 }
2637
2638                 attrs[type] = a;
2639         }
2640
2641         if (rem) {
2642                 OVS_NLERR(log, "Message has %d unknown bytes.", rem);
2643                 return -EINVAL;
2644         }
2645
2646         actions = attrs[OVS_DEC_TTL_ATTR_ACTION];
2647         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) {
2648                 OVS_NLERR(log, "Missing valid actions attribute.");
2649                 return -EINVAL;
2650         }
2651
2652         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_DEC_TTL, log);
2653         if (start < 0)
2654                 return start;
2655
2656         action_start = add_nested_action_start(sfa, OVS_DEC_TTL_ATTR_ACTION, log);
2657         if (action_start < 0)
2658                 return action_start;
2659
2660         err = __ovs_nla_copy_actions(net, actions, key, sfa, eth_type,
2661                                      vlan_tci, mpls_label_count, log);
2662         if (err)
2663                 return err;
2664
2665         add_nested_action_end(*sfa, action_start);
2666         add_nested_action_end(*sfa, start);
2667         return 0;
2668 }
2669
2670 static int validate_and_copy_clone(struct net *net,
2671                                    const struct nlattr *attr,
2672                                    const struct sw_flow_key *key,
2673                                    struct sw_flow_actions **sfa,
2674                                    __be16 eth_type, __be16 vlan_tci,
2675                                    u32 mpls_label_count, bool log, bool last)
2676 {
2677         int start, err;
2678         u32 exec;
2679
2680         if (nla_len(attr) && nla_len(attr) < NLA_HDRLEN)
2681                 return -EINVAL;
2682
2683         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_CLONE, log);
2684         if (start < 0)
2685                 return start;
2686
2687         exec = last || !actions_may_change_flow(attr);
2688
2689         err = ovs_nla_add_action(sfa, OVS_CLONE_ATTR_EXEC, &exec,
2690                                  sizeof(exec), log);
2691         if (err)
2692                 return err;
2693
2694         err = __ovs_nla_copy_actions(net, attr, key, sfa,
2695                                      eth_type, vlan_tci, mpls_label_count, log);
2696         if (err)
2697                 return err;
2698
2699         add_nested_action_end(*sfa, start);
2700
2701         return 0;
2702 }
2703
2704 void ovs_match_init(struct sw_flow_match *match,
2705                     struct sw_flow_key *key,
2706                     bool reset_key,
2707                     struct sw_flow_mask *mask)
2708 {
2709         memset(match, 0, sizeof(*match));
2710         match->key = key;
2711         match->mask = mask;
2712
2713         if (reset_key)
2714                 memset(key, 0, sizeof(*key));
2715
2716         if (mask) {
2717                 memset(&mask->key, 0, sizeof(mask->key));
2718                 mask->range.start = mask->range.end = 0;
2719         }
2720 }
2721
2722 static int validate_geneve_opts(struct sw_flow_key *key)
2723 {
2724         struct geneve_opt *option;
2725         int opts_len = key->tun_opts_len;
2726         bool crit_opt = false;
2727
2728         option = (struct geneve_opt *)TUN_METADATA_OPTS(key, key->tun_opts_len);
2729         while (opts_len > 0) {
2730                 int len;
2731
2732                 if (opts_len < sizeof(*option))
2733                         return -EINVAL;
2734
2735                 len = sizeof(*option) + option->length * 4;
2736                 if (len > opts_len)
2737                         return -EINVAL;
2738
2739                 crit_opt |= !!(option->type & GENEVE_CRIT_OPT_TYPE);
2740
2741                 option = (struct geneve_opt *)((u8 *)option + len);
2742                 opts_len -= len;
2743         }
2744
2745         key->tun_key.tun_flags |= crit_opt ? TUNNEL_CRIT_OPT : 0;
2746
2747         return 0;
2748 }
2749
2750 static int validate_and_copy_set_tun(const struct nlattr *attr,
2751                                      struct sw_flow_actions **sfa, bool log)
2752 {
2753         struct sw_flow_match match;
2754         struct sw_flow_key key;
2755         struct metadata_dst *tun_dst;
2756         struct ip_tunnel_info *tun_info;
2757         struct ovs_tunnel_info *ovs_tun;
2758         struct nlattr *a;
2759         int err = 0, start, opts_type;
2760         __be16 dst_opt_type;
2761
2762         dst_opt_type = 0;
2763         ovs_match_init(&match, &key, true, NULL);
2764         opts_type = ip_tun_from_nlattr(nla_data(attr), &match, false, log);
2765         if (opts_type < 0)
2766                 return opts_type;
2767
2768         if (key.tun_opts_len) {
2769                 switch (opts_type) {
2770                 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
2771                         err = validate_geneve_opts(&key);
2772                         if (err < 0)
2773                                 return err;
2774                         dst_opt_type = TUNNEL_GENEVE_OPT;
2775                         break;
2776                 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
2777                         dst_opt_type = TUNNEL_VXLAN_OPT;
2778                         break;
2779                 case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS:
2780                         dst_opt_type = TUNNEL_ERSPAN_OPT;
2781                         break;
2782                 }
2783         }
2784
2785         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET, log);
2786         if (start < 0)
2787                 return start;
2788
2789         tun_dst = metadata_dst_alloc(key.tun_opts_len, METADATA_IP_TUNNEL,
2790                                      GFP_KERNEL);
2791
2792         if (!tun_dst)
2793                 return -ENOMEM;
2794
2795         err = dst_cache_init(&tun_dst->u.tun_info.dst_cache, GFP_KERNEL);
2796         if (err) {
2797                 dst_release((struct dst_entry *)tun_dst);
2798                 return err;
2799         }
2800
2801         a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL,
2802                          sizeof(*ovs_tun), log);
2803         if (IS_ERR(a)) {
2804                 dst_release((struct dst_entry *)tun_dst);
2805                 return PTR_ERR(a);
2806         }
2807
2808         ovs_tun = nla_data(a);
2809         ovs_tun->tun_dst = tun_dst;
2810
2811         tun_info = &tun_dst->u.tun_info;
2812         tun_info->mode = IP_TUNNEL_INFO_TX;
2813         if (key.tun_proto == AF_INET6)
2814                 tun_info->mode |= IP_TUNNEL_INFO_IPV6;
2815         else if (key.tun_proto == AF_INET && key.tun_key.u.ipv4.dst == 0)
2816                 tun_info->mode |= IP_TUNNEL_INFO_BRIDGE;
2817         tun_info->key = key.tun_key;
2818
2819         /* We need to store the options in the action itself since
2820          * everything else will go away after flow setup. We can append
2821          * it to tun_info and then point there.
2822          */
2823         ip_tunnel_info_opts_set(tun_info,
2824                                 TUN_METADATA_OPTS(&key, key.tun_opts_len),
2825                                 key.tun_opts_len, dst_opt_type);
2826         add_nested_action_end(*sfa, start);
2827
2828         return err;
2829 }
2830
2831 static bool validate_nsh(const struct nlattr *attr, bool is_mask,
2832                          bool is_push_nsh, bool log)
2833 {
2834         struct sw_flow_match match;
2835         struct sw_flow_key key;
2836         int ret = 0;
2837
2838         ovs_match_init(&match, &key, true, NULL);
2839         ret = nsh_key_put_from_nlattr(attr, &match, is_mask,
2840                                       is_push_nsh, log);
2841         return !ret;
2842 }
2843
2844 /* Return false if there are any non-masked bits set.
2845  * Mask follows data immediately, before any netlink padding.
2846  */
2847 static bool validate_masked(u8 *data, int len)
2848 {
2849         u8 *mask = data + len;
2850
2851         while (len--)
2852                 if (*data++ & ~*mask++)
2853                         return false;
2854
2855         return true;
2856 }
2857
2858 static int validate_set(const struct nlattr *a,
2859                         const struct sw_flow_key *flow_key,
2860                         struct sw_flow_actions **sfa, bool *skip_copy,
2861                         u8 mac_proto, __be16 eth_type, bool masked, bool log)
2862 {
2863         const struct nlattr *ovs_key = nla_data(a);
2864         int key_type = nla_type(ovs_key);
2865         size_t key_len;
2866
2867         /* There can be only one key in a action */
2868         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
2869                 return -EINVAL;
2870
2871         key_len = nla_len(ovs_key);
2872         if (masked)
2873                 key_len /= 2;
2874
2875         if (key_type > OVS_KEY_ATTR_MAX ||
2876             !check_attr_len(key_len, ovs_key_lens[key_type].len))
2877                 return -EINVAL;
2878
2879         if (masked && !validate_masked(nla_data(ovs_key), key_len))
2880                 return -EINVAL;
2881
2882         switch (key_type) {
2883         case OVS_KEY_ATTR_PRIORITY:
2884         case OVS_KEY_ATTR_SKB_MARK:
2885         case OVS_KEY_ATTR_CT_MARK:
2886         case OVS_KEY_ATTR_CT_LABELS:
2887                 break;
2888
2889         case OVS_KEY_ATTR_ETHERNET:
2890                 if (mac_proto != MAC_PROTO_ETHERNET)
2891                         return -EINVAL;
2892                 break;
2893
2894         case OVS_KEY_ATTR_TUNNEL: {
2895                 int err;
2896
2897                 if (masked)
2898                         return -EINVAL; /* Masked tunnel set not supported. */
2899
2900                 *skip_copy = true;
2901                 err = validate_and_copy_set_tun(a, sfa, log);
2902                 if (err)
2903                         return err;
2904                 break;
2905         }
2906         case OVS_KEY_ATTR_IPV4: {
2907                 const struct ovs_key_ipv4 *ipv4_key;
2908
2909                 if (eth_type != htons(ETH_P_IP))
2910                         return -EINVAL;
2911
2912                 ipv4_key = nla_data(ovs_key);
2913
2914                 if (masked) {
2915                         const struct ovs_key_ipv4 *mask = ipv4_key + 1;
2916
2917                         /* Non-writeable fields. */
2918                         if (mask->ipv4_proto || mask->ipv4_frag)
2919                                 return -EINVAL;
2920                 } else {
2921                         if (ipv4_key->ipv4_proto != flow_key->ip.proto)
2922                                 return -EINVAL;
2923
2924                         if (ipv4_key->ipv4_frag != flow_key->ip.frag)
2925                                 return -EINVAL;
2926                 }
2927                 break;
2928         }
2929         case OVS_KEY_ATTR_IPV6: {
2930                 const struct ovs_key_ipv6 *ipv6_key;
2931
2932                 if (eth_type != htons(ETH_P_IPV6))
2933                         return -EINVAL;
2934
2935                 ipv6_key = nla_data(ovs_key);
2936
2937                 if (masked) {
2938                         const struct ovs_key_ipv6 *mask = ipv6_key + 1;
2939
2940                         /* Non-writeable fields. */
2941                         if (mask->ipv6_proto || mask->ipv6_frag)
2942                                 return -EINVAL;
2943
2944                         /* Invalid bits in the flow label mask? */
2945                         if (ntohl(mask->ipv6_label) & 0xFFF00000)
2946                                 return -EINVAL;
2947                 } else {
2948                         if (ipv6_key->ipv6_proto != flow_key->ip.proto)
2949                                 return -EINVAL;
2950
2951                         if (ipv6_key->ipv6_frag != flow_key->ip.frag)
2952                                 return -EINVAL;
2953                 }
2954                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
2955                         return -EINVAL;
2956
2957                 break;
2958         }
2959         case OVS_KEY_ATTR_TCP:
2960                 if ((eth_type != htons(ETH_P_IP) &&
2961                      eth_type != htons(ETH_P_IPV6)) ||
2962                     flow_key->ip.proto != IPPROTO_TCP)
2963                         return -EINVAL;
2964
2965                 break;
2966
2967         case OVS_KEY_ATTR_UDP:
2968                 if ((eth_type != htons(ETH_P_IP) &&
2969                      eth_type != htons(ETH_P_IPV6)) ||
2970                     flow_key->ip.proto != IPPROTO_UDP)
2971                         return -EINVAL;
2972
2973                 break;
2974
2975         case OVS_KEY_ATTR_MPLS:
2976                 if (!eth_p_mpls(eth_type))
2977                         return -EINVAL;
2978                 break;
2979
2980         case OVS_KEY_ATTR_SCTP:
2981                 if ((eth_type != htons(ETH_P_IP) &&
2982                      eth_type != htons(ETH_P_IPV6)) ||
2983                     flow_key->ip.proto != IPPROTO_SCTP)
2984                         return -EINVAL;
2985
2986                 break;
2987
2988         case OVS_KEY_ATTR_NSH:
2989                 if (eth_type != htons(ETH_P_NSH))
2990                         return -EINVAL;
2991                 if (!validate_nsh(nla_data(a), masked, false, log))
2992                         return -EINVAL;
2993                 break;
2994
2995         default:
2996                 return -EINVAL;
2997         }
2998
2999         /* Convert non-masked non-tunnel set actions to masked set actions. */
3000         if (!masked && key_type != OVS_KEY_ATTR_TUNNEL) {
3001                 int start, len = key_len * 2;
3002                 struct nlattr *at;
3003
3004                 *skip_copy = true;
3005
3006                 start = add_nested_action_start(sfa,
3007                                                 OVS_ACTION_ATTR_SET_TO_MASKED,
3008                                                 log);
3009                 if (start < 0)
3010                         return start;
3011
3012                 at = __add_action(sfa, key_type, NULL, len, log);
3013                 if (IS_ERR(at))
3014                         return PTR_ERR(at);
3015
3016                 memcpy(nla_data(at), nla_data(ovs_key), key_len); /* Key. */
3017                 memset(nla_data(at) + key_len, 0xff, key_len);    /* Mask. */
3018                 /* Clear non-writeable bits from otherwise writeable fields. */
3019                 if (key_type == OVS_KEY_ATTR_IPV6) {
3020                         struct ovs_key_ipv6 *mask = nla_data(at) + key_len;
3021
3022                         mask->ipv6_label &= htonl(0x000FFFFF);
3023                 }
3024                 add_nested_action_end(*sfa, start);
3025         }
3026
3027         return 0;
3028 }
3029
3030 static int validate_userspace(const struct nlattr *attr)
3031 {
3032         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
3033                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
3034                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
3035                 [OVS_USERSPACE_ATTR_EGRESS_TUN_PORT] = {.type = NLA_U32 },
3036         };
3037         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
3038         int error;
3039
3040         error = nla_parse_nested_deprecated(a, OVS_USERSPACE_ATTR_MAX, attr,
3041                                             userspace_policy, NULL);
3042         if (error)
3043                 return error;
3044
3045         if (!a[OVS_USERSPACE_ATTR_PID] ||
3046             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
3047                 return -EINVAL;
3048
3049         return 0;
3050 }
3051
3052 static const struct nla_policy cpl_policy[OVS_CHECK_PKT_LEN_ATTR_MAX + 1] = {
3053         [OVS_CHECK_PKT_LEN_ATTR_PKT_LEN] = {.type = NLA_U16 },
3054         [OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER] = {.type = NLA_NESTED },
3055         [OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL] = {.type = NLA_NESTED },
3056 };
3057
3058 static int validate_and_copy_check_pkt_len(struct net *net,
3059                                            const struct nlattr *attr,
3060                                            const struct sw_flow_key *key,
3061                                            struct sw_flow_actions **sfa,
3062                                            __be16 eth_type, __be16 vlan_tci,
3063                                            u32 mpls_label_count,
3064                                            bool log, bool last)
3065 {
3066         const struct nlattr *acts_if_greater, *acts_if_lesser_eq;
3067         struct nlattr *a[OVS_CHECK_PKT_LEN_ATTR_MAX + 1];
3068         struct check_pkt_len_arg arg;
3069         int nested_acts_start;
3070         int start, err;
3071
3072         err = nla_parse_deprecated_strict(a, OVS_CHECK_PKT_LEN_ATTR_MAX,
3073                                           nla_data(attr), nla_len(attr),
3074                                           cpl_policy, NULL);
3075         if (err)
3076                 return err;
3077
3078         if (!a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN] ||
3079             !nla_get_u16(a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN]))
3080                 return -EINVAL;
3081
3082         acts_if_lesser_eq = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL];
3083         acts_if_greater = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER];
3084
3085         /* Both the nested action should be present. */
3086         if (!acts_if_greater || !acts_if_lesser_eq)
3087                 return -EINVAL;
3088
3089         /* validation done, copy the nested actions. */
3090         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_CHECK_PKT_LEN,
3091                                         log);
3092         if (start < 0)
3093                 return start;
3094
3095         arg.pkt_len = nla_get_u16(a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN]);
3096         arg.exec_for_lesser_equal =
3097                 last || !actions_may_change_flow(acts_if_lesser_eq);
3098         arg.exec_for_greater =
3099                 last || !actions_may_change_flow(acts_if_greater);
3100
3101         err = ovs_nla_add_action(sfa, OVS_CHECK_PKT_LEN_ATTR_ARG, &arg,
3102                                  sizeof(arg), log);
3103         if (err)
3104                 return err;
3105
3106         nested_acts_start = add_nested_action_start(sfa,
3107                 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL, log);
3108         if (nested_acts_start < 0)
3109                 return nested_acts_start;
3110
3111         err = __ovs_nla_copy_actions(net, acts_if_lesser_eq, key, sfa,
3112                                      eth_type, vlan_tci, mpls_label_count, log);
3113
3114         if (err)
3115                 return err;
3116
3117         add_nested_action_end(*sfa, nested_acts_start);
3118
3119         nested_acts_start = add_nested_action_start(sfa,
3120                 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER, log);
3121         if (nested_acts_start < 0)
3122                 return nested_acts_start;
3123
3124         err = __ovs_nla_copy_actions(net, acts_if_greater, key, sfa,
3125                                      eth_type, vlan_tci, mpls_label_count, log);
3126
3127         if (err)
3128                 return err;
3129
3130         add_nested_action_end(*sfa, nested_acts_start);
3131         add_nested_action_end(*sfa, start);
3132         return 0;
3133 }
3134
3135 static int copy_action(const struct nlattr *from,
3136                        struct sw_flow_actions **sfa, bool log)
3137 {
3138         int totlen = NLA_ALIGN(from->nla_len);
3139         struct nlattr *to;
3140
3141         to = reserve_sfa_size(sfa, from->nla_len, log);
3142         if (IS_ERR(to))
3143                 return PTR_ERR(to);
3144
3145         memcpy(to, from, totlen);
3146         return 0;
3147 }
3148
3149 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
3150                                   const struct sw_flow_key *key,
3151                                   struct sw_flow_actions **sfa,
3152                                   __be16 eth_type, __be16 vlan_tci,
3153                                   u32 mpls_label_count, bool log)
3154 {
3155         u8 mac_proto = ovs_key_mac_proto(key);
3156         const struct nlattr *a;
3157         int rem, err;
3158
3159         nla_for_each_nested(a, attr, rem) {
3160                 /* Expected argument lengths, (u32)-1 for variable length. */
3161                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
3162                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
3163                         [OVS_ACTION_ATTR_RECIRC] = sizeof(u32),
3164                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
3165                         [OVS_ACTION_ATTR_PUSH_MPLS] = sizeof(struct ovs_action_push_mpls),
3166                         [OVS_ACTION_ATTR_POP_MPLS] = sizeof(__be16),
3167                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
3168                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
3169                         [OVS_ACTION_ATTR_SET] = (u32)-1,
3170                         [OVS_ACTION_ATTR_SET_MASKED] = (u32)-1,
3171                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
3172                         [OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash),
3173                         [OVS_ACTION_ATTR_CT] = (u32)-1,
3174                         [OVS_ACTION_ATTR_CT_CLEAR] = 0,
3175                         [OVS_ACTION_ATTR_TRUNC] = sizeof(struct ovs_action_trunc),
3176                         [OVS_ACTION_ATTR_PUSH_ETH] = sizeof(struct ovs_action_push_eth),
3177                         [OVS_ACTION_ATTR_POP_ETH] = 0,
3178                         [OVS_ACTION_ATTR_PUSH_NSH] = (u32)-1,
3179                         [OVS_ACTION_ATTR_POP_NSH] = 0,
3180                         [OVS_ACTION_ATTR_METER] = sizeof(u32),
3181                         [OVS_ACTION_ATTR_CLONE] = (u32)-1,
3182                         [OVS_ACTION_ATTR_CHECK_PKT_LEN] = (u32)-1,
3183                         [OVS_ACTION_ATTR_ADD_MPLS] = sizeof(struct ovs_action_add_mpls),
3184                         [OVS_ACTION_ATTR_DEC_TTL] = (u32)-1,
3185                 };
3186                 const struct ovs_action_push_vlan *vlan;
3187                 int type = nla_type(a);
3188                 bool skip_copy;
3189
3190                 if (type > OVS_ACTION_ATTR_MAX ||
3191                     (action_lens[type] != nla_len(a) &&
3192                      action_lens[type] != (u32)-1))
3193                         return -EINVAL;
3194
3195                 skip_copy = false;
3196                 switch (type) {
3197                 case OVS_ACTION_ATTR_UNSPEC:
3198                         return -EINVAL;
3199
3200                 case OVS_ACTION_ATTR_USERSPACE:
3201                         err = validate_userspace(a);
3202                         if (err)
3203                                 return err;
3204                         break;
3205
3206                 case OVS_ACTION_ATTR_OUTPUT:
3207                         if (nla_get_u32(a) >= DP_MAX_PORTS)
3208                                 return -EINVAL;
3209                         break;
3210
3211                 case OVS_ACTION_ATTR_TRUNC: {
3212                         const struct ovs_action_trunc *trunc = nla_data(a);
3213
3214                         if (trunc->max_len < ETH_HLEN)
3215                                 return -EINVAL;
3216                         break;
3217                 }
3218
3219                 case OVS_ACTION_ATTR_HASH: {
3220                         const struct ovs_action_hash *act_hash = nla_data(a);
3221
3222                         switch (act_hash->hash_alg) {
3223                         case OVS_HASH_ALG_L4:
3224                                 break;
3225                         default:
3226                                 return  -EINVAL;
3227                         }
3228
3229                         break;
3230                 }
3231
3232                 case OVS_ACTION_ATTR_POP_VLAN:
3233                         if (mac_proto != MAC_PROTO_ETHERNET)
3234                                 return -EINVAL;
3235                         vlan_tci = htons(0);
3236                         break;
3237
3238                 case OVS_ACTION_ATTR_PUSH_VLAN:
3239                         if (mac_proto != MAC_PROTO_ETHERNET)
3240                                 return -EINVAL;
3241                         vlan = nla_data(a);
3242                         if (!eth_type_vlan(vlan->vlan_tpid))
3243                                 return -EINVAL;
3244                         if (!(vlan->vlan_tci & htons(VLAN_CFI_MASK)))
3245                                 return -EINVAL;
3246                         vlan_tci = vlan->vlan_tci;
3247                         break;
3248
3249                 case OVS_ACTION_ATTR_RECIRC:
3250                         break;
3251
3252                 case OVS_ACTION_ATTR_ADD_MPLS: {
3253                         const struct ovs_action_add_mpls *mpls = nla_data(a);
3254
3255                         if (!eth_p_mpls(mpls->mpls_ethertype))
3256                                 return -EINVAL;
3257
3258                         if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK) {
3259                                 if (vlan_tci & htons(VLAN_CFI_MASK) ||
3260                                     (eth_type != htons(ETH_P_IP) &&
3261                                      eth_type != htons(ETH_P_IPV6) &&
3262                                      eth_type != htons(ETH_P_ARP) &&
3263                                      eth_type != htons(ETH_P_RARP) &&
3264                                      !eth_p_mpls(eth_type)))
3265                                         return -EINVAL;
3266                                 mpls_label_count++;
3267                         } else {
3268                                 if (mac_proto == MAC_PROTO_ETHERNET) {
3269                                         mpls_label_count = 1;
3270                                         mac_proto = MAC_PROTO_NONE;
3271                                 } else {
3272                                         mpls_label_count++;
3273                                 }
3274                         }
3275                         eth_type = mpls->mpls_ethertype;
3276                         break;
3277                 }
3278
3279                 case OVS_ACTION_ATTR_PUSH_MPLS: {
3280                         const struct ovs_action_push_mpls *mpls = nla_data(a);
3281
3282                         if (!eth_p_mpls(mpls->mpls_ethertype))
3283                                 return -EINVAL;
3284                         /* Prohibit push MPLS other than to a white list
3285                          * for packets that have a known tag order.
3286                          */
3287                         if (vlan_tci & htons(VLAN_CFI_MASK) ||
3288                             (eth_type != htons(ETH_P_IP) &&
3289                              eth_type != htons(ETH_P_IPV6) &&
3290                              eth_type != htons(ETH_P_ARP) &&
3291                              eth_type != htons(ETH_P_RARP) &&
3292                              !eth_p_mpls(eth_type)))
3293                                 return -EINVAL;
3294                         eth_type = mpls->mpls_ethertype;
3295                         mpls_label_count++;
3296                         break;
3297                 }
3298
3299                 case OVS_ACTION_ATTR_POP_MPLS: {
3300                         __be16  proto;
3301                         if (vlan_tci & htons(VLAN_CFI_MASK) ||
3302                             !eth_p_mpls(eth_type))
3303                                 return -EINVAL;
3304
3305                         /* Disallow subsequent L2.5+ set actions and mpls_pop
3306                          * actions once the last MPLS label in the packet is
3307                          * is popped as there is no check here to ensure that
3308                          * the new eth type is valid and thus set actions could
3309                          * write off the end of the packet or otherwise corrupt
3310                          * it.
3311                          *
3312                          * Support for these actions is planned using packet
3313                          * recirculation.
3314                          */
3315                         proto = nla_get_be16(a);
3316
3317                         if (proto == htons(ETH_P_TEB) &&
3318                             mac_proto != MAC_PROTO_NONE)
3319                                 return -EINVAL;
3320
3321                         mpls_label_count--;
3322
3323                         if (!eth_p_mpls(proto) || !mpls_label_count)
3324                                 eth_type = htons(0);
3325                         else
3326                                 eth_type =  proto;
3327
3328                         break;
3329                 }
3330
3331                 case OVS_ACTION_ATTR_SET:
3332                         err = validate_set(a, key, sfa,
3333                                            &skip_copy, mac_proto, eth_type,
3334                                            false, log);
3335                         if (err)
3336                                 return err;
3337                         break;
3338
3339                 case OVS_ACTION_ATTR_SET_MASKED:
3340                         err = validate_set(a, key, sfa,
3341                                            &skip_copy, mac_proto, eth_type,
3342                                            true, log);
3343                         if (err)
3344                                 return err;
3345                         break;
3346
3347                 case OVS_ACTION_ATTR_SAMPLE: {
3348                         bool last = nla_is_last(a, rem);
3349
3350                         err = validate_and_copy_sample(net, a, key, sfa,
3351                                                        eth_type, vlan_tci,
3352                                                        mpls_label_count,
3353                                                        log, last);
3354                         if (err)
3355                                 return err;
3356                         skip_copy = true;
3357                         break;
3358                 }
3359
3360                 case OVS_ACTION_ATTR_CT:
3361                         err = ovs_ct_copy_action(net, a, key, sfa, log);
3362                         if (err)
3363                                 return err;
3364                         skip_copy = true;
3365                         break;
3366
3367                 case OVS_ACTION_ATTR_CT_CLEAR:
3368                         break;
3369
3370                 case OVS_ACTION_ATTR_PUSH_ETH:
3371                         /* Disallow pushing an Ethernet header if one
3372                          * is already present */
3373                         if (mac_proto != MAC_PROTO_NONE)
3374                                 return -EINVAL;
3375                         mac_proto = MAC_PROTO_ETHERNET;
3376                         break;
3377
3378                 case OVS_ACTION_ATTR_POP_ETH:
3379                         if (mac_proto != MAC_PROTO_ETHERNET)
3380                                 return -EINVAL;
3381                         if (vlan_tci & htons(VLAN_CFI_MASK))
3382                                 return -EINVAL;
3383                         mac_proto = MAC_PROTO_NONE;
3384                         break;
3385
3386                 case OVS_ACTION_ATTR_PUSH_NSH:
3387                         if (mac_proto != MAC_PROTO_ETHERNET) {
3388                                 u8 next_proto;
3389
3390                                 next_proto = tun_p_from_eth_p(eth_type);
3391                                 if (!next_proto)
3392                                         return -EINVAL;
3393                         }
3394                         mac_proto = MAC_PROTO_NONE;
3395                         if (!validate_nsh(nla_data(a), false, true, true))
3396                                 return -EINVAL;
3397                         break;
3398
3399                 case OVS_ACTION_ATTR_POP_NSH: {
3400                         __be16 inner_proto;
3401
3402                         if (eth_type != htons(ETH_P_NSH))
3403                                 return -EINVAL;
3404                         inner_proto = tun_p_to_eth_p(key->nsh.base.np);
3405                         if (!inner_proto)
3406                                 return -EINVAL;
3407                         if (key->nsh.base.np == TUN_P_ETHERNET)
3408                                 mac_proto = MAC_PROTO_ETHERNET;
3409                         else
3410                                 mac_proto = MAC_PROTO_NONE;
3411                         break;
3412                 }
3413
3414                 case OVS_ACTION_ATTR_METER:
3415                         /* Non-existent meters are simply ignored.  */
3416                         break;
3417
3418                 case OVS_ACTION_ATTR_CLONE: {
3419                         bool last = nla_is_last(a, rem);
3420
3421                         err = validate_and_copy_clone(net, a, key, sfa,
3422                                                       eth_type, vlan_tci,
3423                                                       mpls_label_count,
3424                                                       log, last);
3425                         if (err)
3426                                 return err;
3427                         skip_copy = true;
3428                         break;
3429                 }
3430
3431                 case OVS_ACTION_ATTR_CHECK_PKT_LEN: {
3432                         bool last = nla_is_last(a, rem);
3433
3434                         err = validate_and_copy_check_pkt_len(net, a, key, sfa,
3435                                                               eth_type,
3436                                                               vlan_tci,
3437                                                               mpls_label_count,
3438                                                               log, last);
3439                         if (err)
3440                                 return err;
3441                         skip_copy = true;
3442                         break;
3443                 }
3444
3445                 case OVS_ACTION_ATTR_DEC_TTL:
3446                         err = validate_and_copy_dec_ttl(net, a, key, sfa,
3447                                                         eth_type, vlan_tci,
3448                                                         mpls_label_count, log);
3449                         if (err)
3450                                 return err;
3451                         skip_copy = true;
3452                         break;
3453
3454                 default:
3455                         OVS_NLERR(log, "Unknown Action type %d", type);
3456                         return -EINVAL;
3457                 }
3458                 if (!skip_copy) {
3459                         err = copy_action(a, sfa, log);
3460                         if (err)
3461                                 return err;
3462                 }
3463         }
3464
3465         if (rem > 0)
3466                 return -EINVAL;
3467
3468         return 0;
3469 }
3470
3471 /* 'key' must be the masked key. */
3472 int ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
3473                          const struct sw_flow_key *key,
3474                          struct sw_flow_actions **sfa, bool log)
3475 {
3476         int err;
3477         u32 mpls_label_count = 0;
3478
3479         *sfa = nla_alloc_flow_actions(min(nla_len(attr), MAX_ACTIONS_BUFSIZE));
3480         if (IS_ERR(*sfa))
3481                 return PTR_ERR(*sfa);
3482
3483         if (eth_p_mpls(key->eth.type))
3484                 mpls_label_count = hweight_long(key->mpls.num_labels_mask);
3485
3486         (*sfa)->orig_len = nla_len(attr);
3487         err = __ovs_nla_copy_actions(net, attr, key, sfa, key->eth.type,
3488                                      key->eth.vlan.tci, mpls_label_count, log);
3489         if (err)
3490                 ovs_nla_free_flow_actions(*sfa);
3491
3492         return err;
3493 }
3494
3495 static int sample_action_to_attr(const struct nlattr *attr,
3496                                  struct sk_buff *skb)
3497 {
3498         struct nlattr *start, *ac_start = NULL, *sample_arg;
3499         int err = 0, rem = nla_len(attr);
3500         const struct sample_arg *arg;
3501         struct nlattr *actions;
3502
3503         start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SAMPLE);
3504         if (!start)
3505                 return -EMSGSIZE;
3506
3507         sample_arg = nla_data(attr);
3508         arg = nla_data(sample_arg);
3509         actions = nla_next(sample_arg, &rem);
3510
3511         if (nla_put_u32(skb, OVS_SAMPLE_ATTR_PROBABILITY, arg->probability)) {
3512                 err = -EMSGSIZE;
3513                 goto out;
3514         }
3515
3516         ac_start = nla_nest_start_noflag(skb, OVS_SAMPLE_ATTR_ACTIONS);
3517         if (!ac_start) {
3518                 err = -EMSGSIZE;
3519                 goto out;
3520         }
3521
3522         err = ovs_nla_put_actions(actions, rem, skb);
3523
3524 out:
3525         if (err) {
3526                 nla_nest_cancel(skb, ac_start);
3527                 nla_nest_cancel(skb, start);
3528         } else {
3529                 nla_nest_end(skb, ac_start);
3530                 nla_nest_end(skb, start);
3531         }
3532
3533         return err;
3534 }
3535
3536 static int clone_action_to_attr(const struct nlattr *attr,
3537                                 struct sk_buff *skb)
3538 {
3539         struct nlattr *start;
3540         int err = 0, rem = nla_len(attr);
3541
3542         start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CLONE);
3543         if (!start)
3544                 return -EMSGSIZE;
3545
3546         /* Skipping the OVS_CLONE_ATTR_EXEC that is always the first attribute. */
3547         attr = nla_next(nla_data(attr), &rem);
3548         err = ovs_nla_put_actions(attr, rem, skb);
3549
3550         if (err)
3551                 nla_nest_cancel(skb, start);
3552         else
3553                 nla_nest_end(skb, start);
3554
3555         return err;
3556 }
3557
3558 static int check_pkt_len_action_to_attr(const struct nlattr *attr,
3559                                         struct sk_buff *skb)
3560 {
3561         struct nlattr *start, *ac_start = NULL;
3562         const struct check_pkt_len_arg *arg;
3563         const struct nlattr *a, *cpl_arg;
3564         int err = 0, rem = nla_len(attr);
3565
3566         start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CHECK_PKT_LEN);
3567         if (!start)
3568                 return -EMSGSIZE;
3569
3570         /* The first nested attribute in 'attr' is always
3571          * 'OVS_CHECK_PKT_LEN_ATTR_ARG'.
3572          */
3573         cpl_arg = nla_data(attr);
3574         arg = nla_data(cpl_arg);
3575
3576         if (nla_put_u16(skb, OVS_CHECK_PKT_LEN_ATTR_PKT_LEN, arg->pkt_len)) {
3577                 err = -EMSGSIZE;
3578                 goto out;
3579         }
3580
3581         /* Second nested attribute in 'attr' is always
3582          * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'.
3583          */
3584         a = nla_next(cpl_arg, &rem);
3585         ac_start =  nla_nest_start_noflag(skb,
3586                                           OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL);
3587         if (!ac_start) {
3588                 err = -EMSGSIZE;
3589                 goto out;
3590         }
3591
3592         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
3593         if (err) {
3594                 nla_nest_cancel(skb, ac_start);
3595                 goto out;
3596         } else {
3597                 nla_nest_end(skb, ac_start);
3598         }
3599
3600         /* Third nested attribute in 'attr' is always
3601          * OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER.
3602          */
3603         a = nla_next(a, &rem);
3604         ac_start =  nla_nest_start_noflag(skb,
3605                                           OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER);
3606         if (!ac_start) {
3607                 err = -EMSGSIZE;
3608                 goto out;
3609         }
3610
3611         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
3612         if (err) {
3613                 nla_nest_cancel(skb, ac_start);
3614                 goto out;
3615         } else {
3616                 nla_nest_end(skb, ac_start);
3617         }
3618
3619         nla_nest_end(skb, start);
3620         return 0;
3621
3622 out:
3623         nla_nest_cancel(skb, start);
3624         return err;
3625 }
3626
3627 static int dec_ttl_action_to_attr(const struct nlattr *attr,
3628                                   struct sk_buff *skb)
3629 {
3630         struct nlattr *start, *action_start;
3631         const struct nlattr *a;
3632         int err = 0, rem;
3633
3634         start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_DEC_TTL);
3635         if (!start)
3636                 return -EMSGSIZE;
3637
3638         nla_for_each_attr(a, nla_data(attr), nla_len(attr), rem) {
3639                 switch (nla_type(a)) {
3640                 case OVS_DEC_TTL_ATTR_ACTION:
3641
3642                         action_start = nla_nest_start_noflag(skb, OVS_DEC_TTL_ATTR_ACTION);
3643                         if (!action_start) {
3644                                 err = -EMSGSIZE;
3645                                 goto out;
3646                         }
3647
3648                         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
3649                         if (err)
3650                                 goto out;
3651
3652                         nla_nest_end(skb, action_start);
3653                         break;
3654
3655                 default:
3656                         /* Ignore all other option to be future compatible */
3657                         break;
3658                 }
3659         }
3660
3661         nla_nest_end(skb, start);
3662         return 0;
3663
3664 out:
3665         nla_nest_cancel(skb, start);
3666         return err;
3667 }
3668
3669 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
3670 {
3671         const struct nlattr *ovs_key = nla_data(a);
3672         int key_type = nla_type(ovs_key);
3673         struct nlattr *start;
3674         int err;
3675
3676         switch (key_type) {
3677         case OVS_KEY_ATTR_TUNNEL_INFO: {
3678                 struct ovs_tunnel_info *ovs_tun = nla_data(ovs_key);
3679                 struct ip_tunnel_info *tun_info = &ovs_tun->tun_dst->u.tun_info;
3680
3681                 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SET);
3682                 if (!start)
3683                         return -EMSGSIZE;
3684
3685                 err =  ip_tun_to_nlattr(skb, &tun_info->key,
3686                                         ip_tunnel_info_opts(tun_info),
3687                                         tun_info->options_len,
3688                                         ip_tunnel_info_af(tun_info), tun_info->mode);
3689                 if (err)
3690                         return err;
3691                 nla_nest_end(skb, start);
3692                 break;
3693         }
3694         default:
3695                 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
3696                         return -EMSGSIZE;
3697                 break;
3698         }
3699
3700         return 0;
3701 }
3702
3703 static int masked_set_action_to_set_action_attr(const struct nlattr *a,
3704                                                 struct sk_buff *skb)
3705 {
3706         const struct nlattr *ovs_key = nla_data(a);
3707         struct nlattr *nla;
3708         size_t key_len = nla_len(ovs_key) / 2;
3709
3710         /* Revert the conversion we did from a non-masked set action to
3711          * masked set action.
3712          */
3713         nla = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SET);
3714         if (!nla)
3715                 return -EMSGSIZE;
3716
3717         if (nla_put(skb, nla_type(ovs_key), key_len, nla_data(ovs_key)))
3718                 return -EMSGSIZE;
3719
3720         nla_nest_end(skb, nla);
3721         return 0;
3722 }
3723
3724 int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
3725 {
3726         const struct nlattr *a;
3727         int rem, err;
3728
3729         nla_for_each_attr(a, attr, len, rem) {
3730                 int type = nla_type(a);
3731
3732                 switch (type) {
3733                 case OVS_ACTION_ATTR_SET:
3734                         err = set_action_to_attr(a, skb);
3735                         if (err)
3736                                 return err;
3737                         break;
3738
3739                 case OVS_ACTION_ATTR_SET_TO_MASKED:
3740                         err = masked_set_action_to_set_action_attr(a, skb);
3741                         if (err)
3742                                 return err;
3743                         break;
3744
3745                 case OVS_ACTION_ATTR_SAMPLE:
3746                         err = sample_action_to_attr(a, skb);
3747                         if (err)
3748                                 return err;
3749                         break;
3750
3751                 case OVS_ACTION_ATTR_CT:
3752                         err = ovs_ct_action_to_attr(nla_data(a), skb);
3753                         if (err)
3754                                 return err;
3755                         break;
3756
3757                 case OVS_ACTION_ATTR_CLONE:
3758                         err = clone_action_to_attr(a, skb);
3759                         if (err)
3760                                 return err;
3761                         break;
3762
3763                 case OVS_ACTION_ATTR_CHECK_PKT_LEN:
3764                         err = check_pkt_len_action_to_attr(a, skb);
3765                         if (err)
3766                                 return err;
3767                         break;
3768
3769                 case OVS_ACTION_ATTR_DEC_TTL:
3770                         err = dec_ttl_action_to_attr(a, skb);
3771                         if (err)
3772                                 return err;
3773                         break;
3774
3775                 default:
3776                         if (nla_put(skb, type, nla_len(a), nla_data(a)))
3777                                 return -EMSGSIZE;
3778                         break;
3779                 }
3780         }
3781
3782         return 0;
3783 }