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 "drop.h"
  42 #include "flow_netlink.h"
  43
  44 struct ovs_len_tbl {
  45         int len;
  46         const struct ovs_len_tbl *next;
  47 };
  48
  49 #define OVS_ATTR_NESTED -1
  50 #define OVS_ATTR_VARIABLE -2
  51 #define OVS_COPY_ACTIONS_MAX_DEPTH 16
  52
  53 static bool actions_may_change_flow(const struct nlattr *actions)
  54 {
  55         struct nlattr *nla;
  56         int rem;
  57
  58         nla_for_each_nested(nla, actions, rem) {
  59                 u16 action = nla_type(nla);
  60
  61                 switch (action) {
  62                 case OVS_ACTION_ATTR_OUTPUT:
  63                 case OVS_ACTION_ATTR_RECIRC:
  64                 case OVS_ACTION_ATTR_TRUNC:
  65                 case OVS_ACTION_ATTR_USERSPACE:
  66                 case OVS_ACTION_ATTR_DROP:
  67                         break;
  68
  69                 case OVS_ACTION_ATTR_CT:
  70                 case OVS_ACTION_ATTR_CT_CLEAR:
  71                 case OVS_ACTION_ATTR_HASH:
  72                 case OVS_ACTION_ATTR_POP_ETH:
  73                 case OVS_ACTION_ATTR_POP_MPLS:
  74                 case OVS_ACTION_ATTR_POP_NSH:
  75                 case OVS_ACTION_ATTR_POP_VLAN:
  76                 case OVS_ACTION_ATTR_PUSH_ETH:
  77                 case OVS_ACTION_ATTR_PUSH_MPLS:
  78                 case OVS_ACTION_ATTR_PUSH_NSH:
  79                 case OVS_ACTION_ATTR_PUSH_VLAN:
  80                 case OVS_ACTION_ATTR_SAMPLE:
  81                 case OVS_ACTION_ATTR_SET:
  82                 case OVS_ACTION_ATTR_SET_MASKED:
  83                 case OVS_ACTION_ATTR_METER:
  84                 case OVS_ACTION_ATTR_CHECK_PKT_LEN:
  85                 case OVS_ACTION_ATTR_ADD_MPLS:
  86                 case OVS_ACTION_ATTR_DEC_TTL:
  87                 default:
  88                         return true;
  89                 }
  90         }
  91         return false;
  92 }
  93
  94 static void update_range(struct sw_flow_match *match,
  95                          size_t offset, size_t size, bool is_mask)
  96 {
  97         struct sw_flow_key_range *range;
  98         size_t start = rounddown(offset, sizeof(long));
  99         size_t end = roundup(offset + size, sizeof(long));
 100
 101         if (!is_mask)
 102                 range = &match->range;
 103         else
 104                 range = &match->mask->range;
 105
 106         if (range->start == range->end) {
 107                 range->start = start;
 108                 range->end = end;
 109                 return;
 110         }
 111
 112         if (range->start > start)
 113                 range->start = start;
 114
 115         if (range->end < end)
 116                 range->end = end;
 117 }
 118
 119 #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
 120         do { \
 121                 update_range(match, offsetof(struct sw_flow_key, field),    \
 122                              sizeof((match)->key->field), is_mask);         \
 123                 if (is_mask)                                                \
 124                         (match)->mask->key.field = value;                   \
 125                 else                                                        \
 126                         (match)->key->field = value;                        \
 127         } while (0)
 128
 129 #define SW_FLOW_KEY_MEMCPY_OFFSET(match, offset, value_p, len, is_mask)     \
 130         do {                                                                \
 131                 update_range(match, offset, len, is_mask);                  \
 132                 if (is_mask)                                                \
 133                         memcpy((u8 *)&(match)->mask->key + offset, value_p, \
 134                                len);                                       \
 135                 else                                                        \
 136                         memcpy((u8 *)(match)->key + offset, value_p, len);  \
 137         } while (0)
 138
 139 #define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask)               \
 140         SW_FLOW_KEY_MEMCPY_OFFSET(match, offsetof(struct sw_flow_key, field), \
 141                                   value_p, len, is_mask)
 142
 143 #define SW_FLOW_KEY_MEMSET_FIELD(match, field, value, is_mask)              \
 144         do {                                                                \
 145                 update_range(match, offsetof(struct sw_flow_key, field),    \
 146                              sizeof((match)->key->field), is_mask);         \
 147                 if (is_mask)                                                \
 148                         memset((u8 *)&(match)->mask->key.field, value,      \
 149                                sizeof((match)->mask->key.field));           \
 150                 else                                                        \
 151                         memset((u8 *)&(match)->key->field, value,           \
 152                                sizeof((match)->key->field));                \
 153         } while (0)
 154
 155 static bool match_validate(const struct sw_flow_match *match,
 156                            u64 key_attrs, u64 mask_attrs, bool log)
 157 {
 158         u64 key_expected = 0;
 159         u64 mask_allowed = key_attrs;  /* At most allow all key attributes */
 160
 161         /* The following mask attributes allowed only if they
 162          * pass the validation tests. */
 163         mask_allowed &= ~((1 << OVS_KEY_ATTR_IPV4)
 164                         | (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4)
 165                         | (1 << OVS_KEY_ATTR_IPV6)
 166                         | (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)
 167                         | (1 << OVS_KEY_ATTR_TCP)
 168                         | (1 << OVS_KEY_ATTR_TCP_FLAGS)
 169                         | (1 << OVS_KEY_ATTR_UDP)
 170                         | (1 << OVS_KEY_ATTR_SCTP)
 171                         | (1 << OVS_KEY_ATTR_ICMP)
 172                         | (1 << OVS_KEY_ATTR_ICMPV6)
 173                         | (1 << OVS_KEY_ATTR_ARP)
 174                         | (1 << OVS_KEY_ATTR_ND)
 175                         | (1 << OVS_KEY_ATTR_MPLS)
 176                         | (1 << OVS_KEY_ATTR_NSH));
 177
 178         /* Always allowed mask fields. */
 179         mask_allowed |= ((1 << OVS_KEY_ATTR_TUNNEL)
 180                        | (1 << OVS_KEY_ATTR_IN_PORT)
 181                        | (1 << OVS_KEY_ATTR_ETHERTYPE));
 182
 183         /* Check key attributes. */
 184         if (match->key->eth.type == htons(ETH_P_ARP)
 185                         || match->key->eth.type == htons(ETH_P_RARP)) {
 186                 key_expected |= 1 << OVS_KEY_ATTR_ARP;
 187                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 188                         mask_allowed |= 1 << OVS_KEY_ATTR_ARP;
 189         }
 190
 191         if (eth_p_mpls(match->key->eth.type)) {
 192                 key_expected |= 1 << OVS_KEY_ATTR_MPLS;
 193                 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
 194                         mask_allowed |= 1 << OVS_KEY_ATTR_MPLS;
 195         }
 196
 197         if (match->key->eth.type == htons(ETH_P_IP)) {
 198                 key_expected |= 1 << OVS_KEY_ATTR_IPV4;
 199                 if (match->mask && match->mask->key.eth.type == htons(0xffff)) {
 200                         mask_allowed |= 1 << OVS_KEY_ATTR_IPV4;
 201                         mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4;
 202                 }
 203
 204                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 205                         if (match->key->ip.proto == IPPROTO_UDP) {
 206                                 key_expected |= 1 << OVS_KEY_ATTR_UDP;
 207                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 208                                         mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
 209                         }
 210
 211                         if (match->key->ip.proto == IPPROTO_SCTP) {
 212                                 key_expected |= 1 << OVS_KEY_ATTR_SCTP;
 213                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 214                                         mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
 215                         }
 216
 217                         if (match->key->ip.proto == IPPROTO_TCP) {
 218                                 key_expected |= 1 << OVS_KEY_ATTR_TCP;
 219                                 key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 220                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 221                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
 222                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 223                                 }
 224                         }
 225
 226                         if (match->key->ip.proto == IPPROTO_ICMP) {
 227                                 key_expected |= 1 << OVS_KEY_ATTR_ICMP;
 228                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 229                                         mask_allowed |= 1 << OVS_KEY_ATTR_ICMP;
 230                         }
 231                 }
 232         }
 233
 234         if (match->key->eth.type == htons(ETH_P_IPV6)) {
 235                 key_expected |= 1 << OVS_KEY_ATTR_IPV6;
 236                 if (match->mask && match->mask->key.eth.type == htons(0xffff)) {
 237                         mask_allowed |= 1 << OVS_KEY_ATTR_IPV6;
 238                         mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6;
 239                 }
 240
 241                 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 242                         if (match->key->ip.proto == IPPROTO_UDP) {
 243                                 key_expected |= 1 << OVS_KEY_ATTR_UDP;
 244                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 245                                         mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
 246                         }
 247
 248                         if (match->key->ip.proto == IPPROTO_SCTP) {
 249                                 key_expected |= 1 << OVS_KEY_ATTR_SCTP;
 250                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 251                                         mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
 252                         }
 253
 254                         if (match->key->ip.proto == IPPROTO_TCP) {
 255                                 key_expected |= 1 << OVS_KEY_ATTR_TCP;
 256                                 key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 257                                 if (match->mask && (match->mask->key.ip.proto == 0xff)) {
 258                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
 259                                         mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
 260                                 }
 261                         }
 262
 263                         if (match->key->ip.proto == IPPROTO_ICMPV6) {
 264                                 key_expected |= 1 << OVS_KEY_ATTR_ICMPV6;
 265                                 if (match->mask && (match->mask->key.ip.proto == 0xff))
 266                                         mask_allowed |= 1 << OVS_KEY_ATTR_ICMPV6;
 267
 268                                 if (match->key->tp.src ==
 269                                                 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 270                                     match->key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 271                                         key_expected |= 1 << OVS_KEY_ATTR_ND;
 272                                         /* Original direction conntrack tuple
 273                                          * uses the same space as the ND fields
 274                                          * in the key, so both are not allowed
 275                                          * at the same time.
 276                                          */
 277                                         mask_allowed &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6);
 278                                         if (match->mask && (match->mask->key.tp.src == htons(0xff)))
 279                                                 mask_allowed |= 1 << OVS_KEY_ATTR_ND;
 280                                 }
 281                         }
 282                 }
 283         }
 284
 285         if (match->key->eth.type == htons(ETH_P_NSH)) {
 286                 key_expected |= 1 << OVS_KEY_ATTR_NSH;
 287                 if (match->mask &&
 288                     match->mask->key.eth.type == htons(0xffff)) {
 289                         mask_allowed |= 1 << OVS_KEY_ATTR_NSH;
 290                 }
 291         }
 292
 293         if ((key_attrs & key_expected) != key_expected) {
 294                 /* Key attributes check failed. */
 295                 OVS_NLERR(log, "Missing key (keys=%llx, expected=%llx)",
 296                           (unsigned long long)key_attrs,
 297                           (unsigned long long)key_expected);
 298                 return false;
 299         }
 300
 301         if ((mask_attrs & mask_allowed) != mask_attrs) {
 302                 /* Mask attributes check failed. */
 303                 OVS_NLERR(log, "Unexpected mask (mask=%llx, allowed=%llx)",
 304                           (unsigned long long)mask_attrs,
 305                           (unsigned long long)mask_allowed);
 306                 return false;
 307         }
 308
 309         return true;
 310 }
 311
 312 size_t ovs_tun_key_attr_size(void)
 313 {
 314         /* Whenever adding new OVS_TUNNEL_KEY_ FIELDS, we should consider
 315          * updating this function.
 316          */
 317         return    nla_total_size_64bit(8) /* OVS_TUNNEL_KEY_ATTR_ID */
 318                 + nla_total_size(16)   /* OVS_TUNNEL_KEY_ATTR_IPV[46]_SRC */
 319                 + nla_total_size(16)   /* OVS_TUNNEL_KEY_ATTR_IPV[46]_DST */
 320                 + nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TOS */
 321                 + nla_total_size(1)    /* OVS_TUNNEL_KEY_ATTR_TTL */
 322                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
 323                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_CSUM */
 324                 + nla_total_size(0)    /* OVS_TUNNEL_KEY_ATTR_OAM */
 325                 + nla_total_size(256)  /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */
 326                 /* OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS and
 327                  * OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS is mutually exclusive with
 328                  * OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS and covered by it.
 329                  */
 330                 + nla_total_size(2)    /* OVS_TUNNEL_KEY_ATTR_TP_SRC */
 331                 + nla_total_size(2);   /* OVS_TUNNEL_KEY_ATTR_TP_DST */
 332 }
 333
 334 static size_t ovs_nsh_key_attr_size(void)
 335 {
 336         /* Whenever adding new OVS_NSH_KEY_ FIELDS, we should consider
 337          * updating this function.
 338          */
 339         return  nla_total_size(NSH_BASE_HDR_LEN) /* OVS_NSH_KEY_ATTR_BASE */
 340                 /* OVS_NSH_KEY_ATTR_MD1 and OVS_NSH_KEY_ATTR_MD2 are
 341                  * mutually exclusive, so the bigger one can cover
 342                  * the small one.
 343                  */
 344                 + nla_total_size(NSH_CTX_HDRS_MAX_LEN);
 345 }
 346
 347 size_t ovs_key_attr_size(void)
 348 {
 349         /* Whenever adding new OVS_KEY_ FIELDS, we should consider
 350          * updating this function.
 351          */
 352         BUILD_BUG_ON(OVS_KEY_ATTR_MAX != 32);
 353
 354         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
 355                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
 356                   + ovs_tun_key_attr_size()
 357                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
 358                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
 359                 + nla_total_size(4)   /* OVS_KEY_ATTR_DP_HASH */
 360                 + nla_total_size(4)   /* OVS_KEY_ATTR_RECIRC_ID */
 361                 + nla_total_size(4)   /* OVS_KEY_ATTR_CT_STATE */
 362                 + nla_total_size(2)   /* OVS_KEY_ATTR_CT_ZONE */
 363                 + nla_total_size(4)   /* OVS_KEY_ATTR_CT_MARK */
 364                 + nla_total_size(16)  /* OVS_KEY_ATTR_CT_LABELS */
 365                 + nla_total_size(40)  /* OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6 */
 366                 + nla_total_size(0)   /* OVS_KEY_ATTR_NSH */
 367                   + ovs_nsh_key_attr_size()
 368                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
 369                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 370                 + nla_total_size(4)   /* OVS_KEY_ATTR_VLAN */
 371                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
 372                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 373                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
 374                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
 375                 + nla_total_size(28)  /* OVS_KEY_ATTR_ND */
 376                 + nla_total_size(2);  /* OVS_KEY_ATTR_IPV6_EXTHDRS */
 377 }
 378
 379 static const struct ovs_len_tbl ovs_vxlan_ext_key_lens[OVS_VXLAN_EXT_MAX + 1] = {
 380         [OVS_VXLAN_EXT_GBP]         = { .len = sizeof(u32) },
 381 };
 382
 383 static const struct ovs_len_tbl ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
 384         [OVS_TUNNEL_KEY_ATTR_ID]            = { .len = sizeof(u64) },
 385         [OVS_TUNNEL_KEY_ATTR_IPV4_SRC]      = { .len = sizeof(u32) },
 386         [OVS_TUNNEL_KEY_ATTR_IPV4_DST]      = { .len = sizeof(u32) },
 387         [OVS_TUNNEL_KEY_ATTR_TOS]           = { .len = 1 },
 388         [OVS_TUNNEL_KEY_ATTR_TTL]           = { .len = 1 },
 389         [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = { .len = 0 },
 390         [OVS_TUNNEL_KEY_ATTR_CSUM]          = { .len = 0 },
 391         [OVS_TUNNEL_KEY_ATTR_TP_SRC]        = { .len = sizeof(u16) },
 392         [OVS_TUNNEL_KEY_ATTR_TP_DST]        = { .len = sizeof(u16) },
 393         [OVS_TUNNEL_KEY_ATTR_OAM]           = { .len = 0 },
 394         [OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS]   = { .len = OVS_ATTR_VARIABLE },
 395         [OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS]    = { .len = OVS_ATTR_NESTED,
 396                                                 .next = ovs_vxlan_ext_key_lens },
 397         [OVS_TUNNEL_KEY_ATTR_IPV6_SRC]      = { .len = sizeof(struct in6_addr) },
 398         [OVS_TUNNEL_KEY_ATTR_IPV6_DST]      = { .len = sizeof(struct in6_addr) },
 399         [OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS]   = { .len = OVS_ATTR_VARIABLE },
 400         [OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE]   = { .len = 0 },
 401 };
 402
 403 static const struct ovs_len_tbl
 404 ovs_nsh_key_attr_lens[OVS_NSH_KEY_ATTR_MAX + 1] = {
 405         [OVS_NSH_KEY_ATTR_BASE] = { .len = sizeof(struct ovs_nsh_key_base) },
 406         [OVS_NSH_KEY_ATTR_MD1]  = { .len = sizeof(struct ovs_nsh_key_md1) },
 407         [OVS_NSH_KEY_ATTR_MD2]  = { .len = OVS_ATTR_VARIABLE },
 408 };
 409
 410 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute.  */
 411 static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
 412         [OVS_KEY_ATTR_ENCAP]     = { .len = OVS_ATTR_NESTED },
 413         [OVS_KEY_ATTR_PRIORITY]  = { .len = sizeof(u32) },
 414         [OVS_KEY_ATTR_IN_PORT]   = { .len = sizeof(u32) },
 415         [OVS_KEY_ATTR_SKB_MARK]  = { .len = sizeof(u32) },
 416         [OVS_KEY_ATTR_ETHERNET]  = { .len = sizeof(struct ovs_key_ethernet) },
 417         [OVS_KEY_ATTR_VLAN]      = { .len = sizeof(__be16) },
 418         [OVS_KEY_ATTR_ETHERTYPE] = { .len = sizeof(__be16) },
 419         [OVS_KEY_ATTR_IPV4]      = { .len = sizeof(struct ovs_key_ipv4) },
 420         [OVS_KEY_ATTR_IPV6]      = { .len = sizeof(struct ovs_key_ipv6) },
 421         [OVS_KEY_ATTR_TCP]       = { .len = sizeof(struct ovs_key_tcp) },
 422         [OVS_KEY_ATTR_TCP_FLAGS] = { .len = sizeof(__be16) },
 423         [OVS_KEY_ATTR_UDP]       = { .len = sizeof(struct ovs_key_udp) },
 424         [OVS_KEY_ATTR_SCTP]      = { .len = sizeof(struct ovs_key_sctp) },
 425         [OVS_KEY_ATTR_ICMP]      = { .len = sizeof(struct ovs_key_icmp) },
 426         [OVS_KEY_ATTR_ICMPV6]    = { .len = sizeof(struct ovs_key_icmpv6) },
 427         [OVS_KEY_ATTR_ARP]       = { .len = sizeof(struct ovs_key_arp) },
 428         [OVS_KEY_ATTR_ND]        = { .len = sizeof(struct ovs_key_nd) },
 429         [OVS_KEY_ATTR_RECIRC_ID] = { .len = sizeof(u32) },
 430         [OVS_KEY_ATTR_DP_HASH]   = { .len = sizeof(u32) },
 431         [OVS_KEY_ATTR_TUNNEL]    = { .len = OVS_ATTR_NESTED,
 432                                      .next = ovs_tunnel_key_lens, },
 433         [OVS_KEY_ATTR_MPLS]      = { .len = OVS_ATTR_VARIABLE },
 434         [OVS_KEY_ATTR_CT_STATE]  = { .len = sizeof(u32) },
 435         [OVS_KEY_ATTR_CT_ZONE]   = { .len = sizeof(u16) },
 436         [OVS_KEY_ATTR_CT_MARK]   = { .len = sizeof(u32) },
 437         [OVS_KEY_ATTR_CT_LABELS] = { .len = sizeof(struct ovs_key_ct_labels) },
 438         [OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4] = {
 439                 .len = sizeof(struct ovs_key_ct_tuple_ipv4) },
 440         [OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6] = {
 441                 .len = sizeof(struct ovs_key_ct_tuple_ipv6) },
 442         [OVS_KEY_ATTR_NSH]       = { .len = OVS_ATTR_NESTED,
 443                                      .next = ovs_nsh_key_attr_lens, },
 444         [OVS_KEY_ATTR_IPV6_EXTHDRS] = {
 445                 .len = sizeof(struct ovs_key_ipv6_exthdrs) },
 446 };
 447
 448 static bool check_attr_len(unsigned int attr_len, unsigned int expected_len)
 449 {
 450         return expected_len == attr_len ||
 451                expected_len == OVS_ATTR_NESTED ||
 452                expected_len == OVS_ATTR_VARIABLE;
 453 }
 454
 455 static bool is_all_zero(const u8 *fp, size_t size)
 456 {
 457         int i;
 458
 459         if (!fp)
 460                 return false;
 461
 462         for (i = 0; i < size; i++)
 463                 if (fp[i])
 464                         return false;
 465
 466         return true;
 467 }
 468
 469 static int __parse_flow_nlattrs(const struct nlattr *attr,
 470                                 const struct nlattr *a[],
 471                                 u64 *attrsp, bool log, bool nz)
 472 {
 473         const struct nlattr *nla;
 474         u64 attrs;
 475         int rem;
 476
 477         attrs = *attrsp;
 478         nla_for_each_nested(nla, attr, rem) {
 479                 u16 type = nla_type(nla);
 480                 int expected_len;
 481
 482                 if (type > OVS_KEY_ATTR_MAX) {
 483                         OVS_NLERR(log, "Key type %d is out of range max %d",
 484                                   type, OVS_KEY_ATTR_MAX);
 485                         return -EINVAL;
 486                 }
 487
 488                 if (type == OVS_KEY_ATTR_PACKET_TYPE ||
 489                     type == OVS_KEY_ATTR_ND_EXTENSIONS ||
 490                     type == OVS_KEY_ATTR_TUNNEL_INFO) {
 491                         OVS_NLERR(log, "Key type %d is not supported", type);
 492                         return -EINVAL;
 493                 }
 494
 495                 if (attrs & (1ULL << type)) {
 496                         OVS_NLERR(log, "Duplicate key (type %d).", type);
 497                         return -EINVAL;
 498                 }
 499
 500                 expected_len = ovs_key_lens[type].len;
 501                 if (!check_attr_len(nla_len(nla), expected_len)) {
 502                         OVS_NLERR(log, "Key %d has unexpected len %d expected %d",
 503                                   type, nla_len(nla), expected_len);
 504                         return -EINVAL;
 505                 }
 506
 507                 if (!nz || !is_all_zero(nla_data(nla), nla_len(nla))) {
 508                         attrs |= 1ULL << type;
 509                         a[type] = nla;
 510                 }
 511         }
 512         if (rem) {
 513                 OVS_NLERR(log, "Message has %d unknown bytes.", rem);
 514                 return -EINVAL;
 515         }
 516
 517         *attrsp = attrs;
 518         return 0;
 519 }
 520
 521 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
 522                                    const struct nlattr *a[], u64 *attrsp,
 523                                    bool log)
 524 {
 525         return __parse_flow_nlattrs(attr, a, attrsp, log, true);
 526 }
 527
 528 int parse_flow_nlattrs(const struct nlattr *attr, const struct nlattr *a[],
 529                        u64 *attrsp, bool log)
 530 {
 531         return __parse_flow_nlattrs(attr, a, attrsp, log, false);
 532 }
 533
 534 static int genev_tun_opt_from_nlattr(const struct nlattr *a,
 535                                      struct sw_flow_match *match, bool is_mask,
 536                                      bool log)
 537 {
 538         unsigned long opt_key_offset;
 539
 540         if (nla_len(a) > sizeof(match->key->tun_opts)) {
 541                 OVS_NLERR(log, "Geneve option length err (len %d, max %zu).",
 542                           nla_len(a), sizeof(match->key->tun_opts));
 543                 return -EINVAL;
 544         }
 545
 546         if (nla_len(a) % 4 != 0) {
 547                 OVS_NLERR(log, "Geneve opt len %d is not a multiple of 4.",
 548                           nla_len(a));
 549                 return -EINVAL;
 550         }
 551
 552         /* We need to record the length of the options passed
 553          * down, otherwise packets with the same format but
 554          * additional options will be silently matched.
 555          */
 556         if (!is_mask) {
 557                 SW_FLOW_KEY_PUT(match, tun_opts_len, nla_len(a),
 558                                 false);
 559         } else {
 560                 /* This is somewhat unusual because it looks at
 561                  * both the key and mask while parsing the
 562                  * attributes (and by extension assumes the key
 563                  * is parsed first). Normally, we would verify
 564                  * that each is the correct length and that the
 565                  * attributes line up in the validate function.
 566                  * However, that is difficult because this is
 567                  * variable length and we won't have the
 568                  * information later.
 569                  */
 570                 if (match->key->tun_opts_len != nla_len(a)) {
 571                         OVS_NLERR(log, "Geneve option len %d != mask len %d",
 572                                   match->key->tun_opts_len, nla_len(a));
 573                         return -EINVAL;
 574                 }
 575
 576                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
 577         }
 578
 579         opt_key_offset = TUN_METADATA_OFFSET(nla_len(a));
 580         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a),
 581                                   nla_len(a), is_mask);
 582         return 0;
 583 }
 584
 585 static int vxlan_tun_opt_from_nlattr(const struct nlattr *attr,
 586                                      struct sw_flow_match *match, bool is_mask,
 587                                      bool log)
 588 {
 589         struct nlattr *a;
 590         int rem;
 591         unsigned long opt_key_offset;
 592         struct vxlan_metadata opts;
 593
 594         BUILD_BUG_ON(sizeof(opts) > sizeof(match->key->tun_opts));
 595
 596         memset(&opts, 0, sizeof(opts));
 597         nla_for_each_nested(a, attr, rem) {
 598                 int type = nla_type(a);
 599
 600                 if (type > OVS_VXLAN_EXT_MAX) {
 601                         OVS_NLERR(log, "VXLAN extension %d out of range max %d",
 602                                   type, OVS_VXLAN_EXT_MAX);
 603                         return -EINVAL;
 604                 }
 605
 606                 if (!check_attr_len(nla_len(a),
 607                                     ovs_vxlan_ext_key_lens[type].len)) {
 608                         OVS_NLERR(log, "VXLAN extension %d has unexpected len %d expected %d",
 609                                   type, nla_len(a),
 610                                   ovs_vxlan_ext_key_lens[type].len);
 611                         return -EINVAL;
 612                 }
 613
 614                 switch (type) {
 615                 case OVS_VXLAN_EXT_GBP:
 616                         opts.gbp = nla_get_u32(a);
 617                         break;
 618                 default:
 619                         OVS_NLERR(log, "Unknown VXLAN extension attribute %d",
 620                                   type);
 621                         return -EINVAL;
 622                 }
 623         }
 624         if (rem) {
 625                 OVS_NLERR(log, "VXLAN extension message has %d unknown bytes.",
 626                           rem);
 627                 return -EINVAL;
 628         }
 629
 630         if (!is_mask)
 631                 SW_FLOW_KEY_PUT(match, tun_opts_len, sizeof(opts), false);
 632         else
 633                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
 634
 635         opt_key_offset = TUN_METADATA_OFFSET(sizeof(opts));
 636         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, &opts, sizeof(opts),
 637                                   is_mask);
 638         return 0;
 639 }
 640
 641 static int erspan_tun_opt_from_nlattr(const struct nlattr *a,
 642                                       struct sw_flow_match *match, bool is_mask,
 643                                       bool log)
 644 {
 645         unsigned long opt_key_offset;
 646
 647         BUILD_BUG_ON(sizeof(struct erspan_metadata) >
 648                      sizeof(match->key->tun_opts));
 649
 650         if (nla_len(a) > sizeof(match->key->tun_opts)) {
 651                 OVS_NLERR(log, "ERSPAN option length err (len %d, max %zu).",
 652                           nla_len(a), sizeof(match->key->tun_opts));
 653                 return -EINVAL;
 654         }
 655
 656         if (!is_mask)
 657                 SW_FLOW_KEY_PUT(match, tun_opts_len,
 658                                 sizeof(struct erspan_metadata), false);
 659         else
 660                 SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
 661
 662         opt_key_offset = TUN_METADATA_OFFSET(nla_len(a));
 663         SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a),
 664                                   nla_len(a), is_mask);
 665         return 0;
 666 }
 667
 668 static int ip_tun_from_nlattr(const struct nlattr *attr,
 669                               struct sw_flow_match *match, bool is_mask,
 670                               bool log)
 671 {
 672         bool ttl = false, ipv4 = false, ipv6 = false;
 673         bool info_bridge_mode = false;
 674         __be16 tun_flags = 0;
 675         int opts_type = 0;
 676         struct nlattr *a;
 677         int rem;
 678
 679         nla_for_each_nested(a, attr, rem) {
 680                 int type = nla_type(a);
 681                 int err;
 682
 683                 if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
 684                         OVS_NLERR(log, "Tunnel attr %d out of range max %d",
 685                                   type, OVS_TUNNEL_KEY_ATTR_MAX);
 686                         return -EINVAL;
 687                 }
 688
 689                 if (!check_attr_len(nla_len(a),
 690                                     ovs_tunnel_key_lens[type].len)) {
 691                         OVS_NLERR(log, "Tunnel attr %d has unexpected len %d expected %d",
 692                                   type, nla_len(a), ovs_tunnel_key_lens[type].len);
 693                         return -EINVAL;
 694                 }
 695
 696                 switch (type) {
 697                 case OVS_TUNNEL_KEY_ATTR_ID:
 698                         SW_FLOW_KEY_PUT(match, tun_key.tun_id,
 699                                         nla_get_be64(a), is_mask);
 700                         tun_flags |= TUNNEL_KEY;
 701                         break;
 702                 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
 703                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.src,
 704                                         nla_get_in_addr(a), is_mask);
 705                         ipv4 = true;
 706                         break;
 707                 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
 708                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv4.dst,
 709                                         nla_get_in_addr(a), is_mask);
 710                         ipv4 = true;
 711                         break;
 712                 case OVS_TUNNEL_KEY_ATTR_IPV6_SRC:
 713                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.src,
 714                                         nla_get_in6_addr(a), is_mask);
 715                         ipv6 = true;
 716                         break;
 717                 case OVS_TUNNEL_KEY_ATTR_IPV6_DST:
 718                         SW_FLOW_KEY_PUT(match, tun_key.u.ipv6.dst,
 719                                         nla_get_in6_addr(a), is_mask);
 720                         ipv6 = true;
 721                         break;
 722                 case OVS_TUNNEL_KEY_ATTR_TOS:
 723                         SW_FLOW_KEY_PUT(match, tun_key.tos,
 724                                         nla_get_u8(a), is_mask);
 725                         break;
 726                 case OVS_TUNNEL_KEY_ATTR_TTL:
 727                         SW_FLOW_KEY_PUT(match, tun_key.ttl,
 728                                         nla_get_u8(a), is_mask);
 729                         ttl = true;
 730                         break;
 731                 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
 732                         tun_flags |= TUNNEL_DONT_FRAGMENT;
 733                         break;
 734                 case OVS_TUNNEL_KEY_ATTR_CSUM:
 735                         tun_flags |= TUNNEL_CSUM;
 736                         break;
 737                 case OVS_TUNNEL_KEY_ATTR_TP_SRC:
 738                         SW_FLOW_KEY_PUT(match, tun_key.tp_src,
 739                                         nla_get_be16(a), is_mask);
 740                         break;
 741                 case OVS_TUNNEL_KEY_ATTR_TP_DST:
 742                         SW_FLOW_KEY_PUT(match, tun_key.tp_dst,
 743                                         nla_get_be16(a), is_mask);
 744                         break;
 745                 case OVS_TUNNEL_KEY_ATTR_OAM:
 746                         tun_flags |= TUNNEL_OAM;
 747                         break;
 748                 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
 749                         if (opts_type) {
 750                                 OVS_NLERR(log, "Multiple metadata blocks provided");
 751                                 return -EINVAL;
 752                         }
 753
 754                         err = genev_tun_opt_from_nlattr(a, match, is_mask, log);
 755                         if (err)
 756                                 return err;
 757
 758                         tun_flags |= TUNNEL_GENEVE_OPT;
 759                         opts_type = type;
 760                         break;
 761                 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
 762                         if (opts_type) {
 763                                 OVS_NLERR(log, "Multiple metadata blocks provided");
 764                                 return -EINVAL;
 765                         }
 766
 767                         err = vxlan_tun_opt_from_nlattr(a, match, is_mask, log);
 768                         if (err)
 769                                 return err;
 770
 771                         tun_flags |= TUNNEL_VXLAN_OPT;
 772                         opts_type = type;
 773                         break;
 774                 case OVS_TUNNEL_KEY_ATTR_PAD:
 775                         break;
 776                 case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS:
 777                         if (opts_type) {
 778                                 OVS_NLERR(log, "Multiple metadata blocks provided");
 779                                 return -EINVAL;
 780                         }
 781
 782                         err = erspan_tun_opt_from_nlattr(a, match, is_mask,
 783                                                          log);
 784                         if (err)
 785                                 return err;
 786
 787                         tun_flags |= TUNNEL_ERSPAN_OPT;
 788                         opts_type = type;
 789                         break;
 790                 case OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE:
 791                         info_bridge_mode = true;
 792                         ipv4 = true;
 793                         break;
 794                 default:
 795                         OVS_NLERR(log, "Unknown IP tunnel attribute %d",
 796                                   type);
 797                         return -EINVAL;
 798                 }
 799         }
 800
 801         SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
 802         if (is_mask)
 803                 SW_FLOW_KEY_MEMSET_FIELD(match, tun_proto, 0xff, true);
 804         else
 805                 SW_FLOW_KEY_PUT(match, tun_proto, ipv6 ? AF_INET6 : AF_INET,
 806                                 false);
 807
 808         if (rem > 0) {
 809                 OVS_NLERR(log, "IP tunnel attribute has %d unknown bytes.",
 810                           rem);
 811                 return -EINVAL;
 812         }
 813
 814         if (ipv4 && ipv6) {
 815                 OVS_NLERR(log, "Mixed IPv4 and IPv6 tunnel attributes");
 816                 return -EINVAL;
 817         }
 818
 819         if (!is_mask) {
 820                 if (!ipv4 && !ipv6) {
 821                         OVS_NLERR(log, "IP tunnel dst address not specified");
 822                         return -EINVAL;
 823                 }
 824                 if (ipv4) {
 825                         if (info_bridge_mode) {
 826                                 if (match->key->tun_key.u.ipv4.src ||
 827                                     match->key->tun_key.u.ipv4.dst ||
 828                                     match->key->tun_key.tp_src ||
 829                                     match->key->tun_key.tp_dst ||
 830                                     match->key->tun_key.ttl ||
 831                                     match->key->tun_key.tos ||
 832                                     tun_flags & ~TUNNEL_KEY) {
 833                                         OVS_NLERR(log, "IPv4 tun info is not correct");
 834                                         return -EINVAL;
 835                                 }
 836                         } else if (!match->key->tun_key.u.ipv4.dst) {
 837                                 OVS_NLERR(log, "IPv4 tunnel dst address is zero");
 838                                 return -EINVAL;
 839                         }
 840                 }
 841                 if (ipv6 && ipv6_addr_any(&match->key->tun_key.u.ipv6.dst)) {
 842                         OVS_NLERR(log, "IPv6 tunnel dst address is zero");
 843                         return -EINVAL;
 844                 }
 845
 846                 if (!ttl && !info_bridge_mode) {
 847                         OVS_NLERR(log, "IP tunnel TTL not specified.");
 848                         return -EINVAL;
 849                 }
 850         }
 851
 852         return opts_type;
 853 }
 854
 855 static int vxlan_opt_to_nlattr(struct sk_buff *skb,
 856                                const void *tun_opts, int swkey_tun_opts_len)
 857 {
 858         const struct vxlan_metadata *opts = tun_opts;
 859         struct nlattr *nla;
 860
 861         nla = nla_nest_start_noflag(skb, OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS);
 862         if (!nla)
 863                 return -EMSGSIZE;
 864
 865         if (nla_put_u32(skb, OVS_VXLAN_EXT_GBP, opts->gbp) < 0)
 866                 return -EMSGSIZE;
 867
 868         nla_nest_end(skb, nla);
 869         return 0;
 870 }
 871
 872 static int __ip_tun_to_nlattr(struct sk_buff *skb,
 873                               const struct ip_tunnel_key *output,
 874                               const void *tun_opts, int swkey_tun_opts_len,
 875                               unsigned short tun_proto, u8 mode)
 876 {
 877         if (output->tun_flags & TUNNEL_KEY &&
 878             nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id,
 879                          OVS_TUNNEL_KEY_ATTR_PAD))
 880                 return -EMSGSIZE;
 881
 882         if (mode & IP_TUNNEL_INFO_BRIDGE)
 883                 return nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE)
 884                        ? -EMSGSIZE : 0;
 885
 886         switch (tun_proto) {
 887         case AF_INET:
 888                 if (output->u.ipv4.src &&
 889                     nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC,
 890                                     output->u.ipv4.src))
 891                         return -EMSGSIZE;
 892                 if (output->u.ipv4.dst &&
 893                     nla_put_in_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST,
 894                                     output->u.ipv4.dst))
 895                         return -EMSGSIZE;
 896                 break;
 897         case AF_INET6:
 898                 if (!ipv6_addr_any(&output->u.ipv6.src) &&
 899                     nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_SRC,
 900                                      &output->u.ipv6.src))
 901                         return -EMSGSIZE;
 902                 if (!ipv6_addr_any(&output->u.ipv6.dst) &&
 903                     nla_put_in6_addr(skb, OVS_TUNNEL_KEY_ATTR_IPV6_DST,
 904                                      &output->u.ipv6.dst))
 905                         return -EMSGSIZE;
 906                 break;
 907         }
 908         if (output->tos &&
 909             nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->tos))
 910                 return -EMSGSIZE;
 911         if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ttl))
 912                 return -EMSGSIZE;
 913         if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
 914             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
 915                 return -EMSGSIZE;
 916         if ((output->tun_flags & TUNNEL_CSUM) &&
 917             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
 918                 return -EMSGSIZE;
 919         if (output->tp_src &&
 920             nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_SRC, output->tp_src))
 921                 return -EMSGSIZE;
 922         if (output->tp_dst &&
 923             nla_put_be16(skb, OVS_TUNNEL_KEY_ATTR_TP_DST, output->tp_dst))
 924                 return -EMSGSIZE;
 925         if ((output->tun_flags & TUNNEL_OAM) &&
 926             nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_OAM))
 927                 return -EMSGSIZE;
 928         if (swkey_tun_opts_len) {
 929                 if (output->tun_flags & TUNNEL_GENEVE_OPT &&
 930                     nla_put(skb, OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS,
 931                             swkey_tun_opts_len, tun_opts))
 932                         return -EMSGSIZE;
 933                 else if (output->tun_flags & TUNNEL_VXLAN_OPT &&
 934                          vxlan_opt_to_nlattr(skb, tun_opts, swkey_tun_opts_len))
 935                         return -EMSGSIZE;
 936                 else if (output->tun_flags & TUNNEL_ERSPAN_OPT &&
 937                          nla_put(skb, OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS,
 938                                  swkey_tun_opts_len, tun_opts))
 939                         return -EMSGSIZE;
 940         }
 941
 942         return 0;
 943 }
 944
 945 static int ip_tun_to_nlattr(struct sk_buff *skb,
 946                             const struct ip_tunnel_key *output,
 947                             const void *tun_opts, int swkey_tun_opts_len,
 948                             unsigned short tun_proto, u8 mode)
 949 {
 950         struct nlattr *nla;
 951         int err;
 952
 953         nla = nla_nest_start_noflag(skb, OVS_KEY_ATTR_TUNNEL);
 954         if (!nla)
 955                 return -EMSGSIZE;
 956
 957         err = __ip_tun_to_nlattr(skb, output, tun_opts, swkey_tun_opts_len,
 958                                  tun_proto, mode);
 959         if (err)
 960                 return err;
 961
 962         nla_nest_end(skb, nla);
 963         return 0;
 964 }
 965
 966 int ovs_nla_put_tunnel_info(struct sk_buff *skb,
 967                             struct ip_tunnel_info *tun_info)
 968 {
 969         return __ip_tun_to_nlattr(skb, &tun_info->key,
 970                                   ip_tunnel_info_opts(tun_info),
 971                                   tun_info->options_len,
 972                                   ip_tunnel_info_af(tun_info), tun_info->mode);
 973 }
 974
 975 static int encode_vlan_from_nlattrs(struct sw_flow_match *match,
 976                                     const struct nlattr *a[],
 977                                     bool is_mask, bool inner)
 978 {
 979         __be16 tci = 0;
 980         __be16 tpid = 0;
 981
 982         if (a[OVS_KEY_ATTR_VLAN])
 983                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 984
 985         if (a[OVS_KEY_ATTR_ETHERTYPE])
 986                 tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 987
 988         if (likely(!inner)) {
 989                 SW_FLOW_KEY_PUT(match, eth.vlan.tpid, tpid, is_mask);
 990                 SW_FLOW_KEY_PUT(match, eth.vlan.tci, tci, is_mask);
 991         } else {
 992                 SW_FLOW_KEY_PUT(match, eth.cvlan.tpid, tpid, is_mask);
 993                 SW_FLOW_KEY_PUT(match, eth.cvlan.tci, tci, is_mask);
 994         }
 995         return 0;
 996 }
 997
 998 static int validate_vlan_from_nlattrs(const struct sw_flow_match *match,
 999                                       u64 key_attrs, bool inner,
1000                                       const struct nlattr **a, bool log)
1001 {
1002         __be16 tci = 0;
1003
1004         if (!((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) &&
1005               (key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
1006                eth_type_vlan(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE])))) {
1007                 /* Not a VLAN. */
1008                 return 0;
1009         }
1010
1011         if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
1012               (key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
1013                 OVS_NLERR(log, "Invalid %s frame", (inner) ? "C-VLAN" : "VLAN");
1014                 return -EINVAL;
1015         }
1016
1017         if (a[OVS_KEY_ATTR_VLAN])
1018                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1019
1020         if (!(tci & htons(VLAN_CFI_MASK))) {
1021                 if (tci) {
1022                         OVS_NLERR(log, "%s TCI does not have VLAN_CFI_MASK bit set.",
1023                                   (inner) ? "C-VLAN" : "VLAN");
1024                         return -EINVAL;
1025                 } else if (nla_len(a[OVS_KEY_ATTR_ENCAP])) {
1026                         /* Corner case for truncated VLAN header. */
1027                         OVS_NLERR(log, "Truncated %s header has non-zero encap attribute.",
1028                                   (inner) ? "C-VLAN" : "VLAN");
1029                         return -EINVAL;
1030                 }
1031         }
1032
1033         return 1;
1034 }
1035
1036 static int validate_vlan_mask_from_nlattrs(const struct sw_flow_match *match,
1037                                            u64 key_attrs, bool inner,
1038                                            const struct nlattr **a, bool log)
1039 {
1040         __be16 tci = 0;
1041         __be16 tpid = 0;
1042         bool encap_valid = !!(match->key->eth.vlan.tci &
1043                               htons(VLAN_CFI_MASK));
1044         bool i_encap_valid = !!(match->key->eth.cvlan.tci &
1045                                 htons(VLAN_CFI_MASK));
1046
1047         if (!(key_attrs & (1 << OVS_KEY_ATTR_ENCAP))) {
1048                 /* Not a VLAN. */
1049                 return 0;
1050         }
1051
1052         if ((!inner && !encap_valid) || (inner && !i_encap_valid)) {
1053                 OVS_NLERR(log, "Encap mask attribute is set for non-%s frame.",
1054                           (inner) ? "C-VLAN" : "VLAN");
1055                 return -EINVAL;
1056         }
1057
1058         if (a[OVS_KEY_ATTR_VLAN])
1059                 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1060
1061         if (a[OVS_KEY_ATTR_ETHERTYPE])
1062                 tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1063
1064         if (tpid != htons(0xffff)) {
1065                 OVS_NLERR(log, "Must have an exact match on %s TPID (mask=%x).",
1066                           (inner) ? "C-VLAN" : "VLAN", ntohs(tpid));
1067                 return -EINVAL;
1068         }
1069         if (!(tci & htons(VLAN_CFI_MASK))) {
1070                 OVS_NLERR(log, "%s TCI mask does not have exact match for VLAN_CFI_MASK bit.",
1071                           (inner) ? "C-VLAN" : "VLAN");
1072                 return -EINVAL;
1073         }
1074
1075         return 1;
1076 }
1077
1078 static int __parse_vlan_from_nlattrs(struct sw_flow_match *match,
1079                                      u64 *key_attrs, bool inner,
1080                                      const struct nlattr **a, bool is_mask,
1081                                      bool log)
1082 {
1083         int err;
1084         const struct nlattr *encap;
1085
1086         if (!is_mask)
1087                 err = validate_vlan_from_nlattrs(match, *key_attrs, inner,
1088                                                  a, log);
1089         else
1090                 err = validate_vlan_mask_from_nlattrs(match, *key_attrs, inner,
1091                                                       a, log);
1092         if (err <= 0)
1093                 return err;
1094
1095         err = encode_vlan_from_nlattrs(match, a, is_mask, inner);
1096         if (err)
1097                 return err;
1098
1099         *key_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
1100         *key_attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
1101         *key_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
1102
1103         encap = a[OVS_KEY_ATTR_ENCAP];
1104
1105         if (!is_mask)
1106                 err = parse_flow_nlattrs(encap, a, key_attrs, log);
1107         else
1108                 err = parse_flow_mask_nlattrs(encap, a, key_attrs, log);
1109
1110         return err;
1111 }
1112
1113 static int parse_vlan_from_nlattrs(struct sw_flow_match *match,
1114                                    u64 *key_attrs, const struct nlattr **a,
1115                                    bool is_mask, bool log)
1116 {
1117         int err;
1118         bool encap_valid = false;
1119
1120         err = __parse_vlan_from_nlattrs(match, key_attrs, false, a,
1121                                         is_mask, log);
1122         if (err)
1123                 return err;
1124
1125         encap_valid = !!(match->key->eth.vlan.tci & htons(VLAN_CFI_MASK));
1126         if (encap_valid) {
1127                 err = __parse_vlan_from_nlattrs(match, key_attrs, true, a,
1128                                                 is_mask, log);
1129                 if (err)
1130                         return err;
1131         }
1132
1133         return 0;
1134 }
1135
1136 static int parse_eth_type_from_nlattrs(struct sw_flow_match *match,
1137                                        u64 *attrs, const struct nlattr **a,
1138                                        bool is_mask, bool log)
1139 {
1140         __be16 eth_type;
1141
1142         eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1143         if (is_mask) {
1144                 /* Always exact match EtherType. */
1145                 eth_type = htons(0xffff);
1146         } else if (!eth_proto_is_802_3(eth_type)) {
1147                 OVS_NLERR(log, "EtherType %x is less than min %x",
1148                                 ntohs(eth_type), ETH_P_802_3_MIN);
1149                 return -EINVAL;
1150         }
1151
1152         SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
1153         *attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
1154         return 0;
1155 }
1156
1157 static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
1158                                  u64 *attrs, const struct nlattr **a,
1159                                  bool is_mask, bool log)
1160 {
1161         u8 mac_proto = MAC_PROTO_ETHERNET;
1162
1163         if (*attrs & (1 << OVS_KEY_ATTR_DP_HASH)) {
1164                 u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]);
1165
1166                 SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask);
1167                 *attrs &= ~(1 << OVS_KEY_ATTR_DP_HASH);
1168         }
1169
1170         if (*attrs & (1 << OVS_KEY_ATTR_RECIRC_ID)) {
1171                 u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]);
1172
1173                 SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask);
1174                 *attrs &= ~(1 << OVS_KEY_ATTR_RECIRC_ID);
1175         }
1176
1177         if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
1178                 SW_FLOW_KEY_PUT(match, phy.priority,
1179                           nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
1180                 *attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY);
1181         }
1182
1183         if (*attrs & (1 << OVS_KEY_ATTR_IN_PORT)) {
1184                 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
1185
1186                 if (is_mask) {
1187                         in_port = 0xffffffff; /* Always exact match in_port. */
1188                 } else if (in_port >= DP_MAX_PORTS) {
1189                         OVS_NLERR(log, "Port %d exceeds max allowable %d",
1190                                   in_port, DP_MAX_PORTS);
1191                         return -EINVAL;
1192                 }
1193
1194                 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
1195                 *attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT);
1196         } else if (!is_mask) {
1197                 SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
1198         }
1199
1200         if (*attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) {
1201                 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
1202
1203                 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
1204                 *attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK);
1205         }
1206         if (*attrs & (1 << OVS_KEY_ATTR_TUNNEL)) {
1207                 if (ip_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
1208                                        is_mask, log) < 0)
1209                         return -EINVAL;
1210                 *attrs &= ~(1 << OVS_KEY_ATTR_TUNNEL);
1211         }
1212
1213         if (*attrs & (1 << OVS_KEY_ATTR_CT_STATE) &&
1214             ovs_ct_verify(net, OVS_KEY_ATTR_CT_STATE)) {
1215                 u32 ct_state = nla_get_u32(a[OVS_KEY_ATTR_CT_STATE]);
1216
1217                 if (ct_state & ~CT_SUPPORTED_MASK) {
1218                         OVS_NLERR(log, "ct_state flags %08x unsupported",
1219                                   ct_state);
1220                         return -EINVAL;
1221                 }
1222
1223                 SW_FLOW_KEY_PUT(match, ct_state, ct_state, is_mask);
1224                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_STATE);
1225         }
1226         if (*attrs & (1 << OVS_KEY_ATTR_CT_ZONE) &&
1227             ovs_ct_verify(net, OVS_KEY_ATTR_CT_ZONE)) {
1228                 u16 ct_zone = nla_get_u16(a[OVS_KEY_ATTR_CT_ZONE]);
1229
1230                 SW_FLOW_KEY_PUT(match, ct_zone, ct_zone, is_mask);
1231                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ZONE);
1232         }
1233         if (*attrs & (1 << OVS_KEY_ATTR_CT_MARK) &&
1234             ovs_ct_verify(net, OVS_KEY_ATTR_CT_MARK)) {
1235                 u32 mark = nla_get_u32(a[OVS_KEY_ATTR_CT_MARK]);
1236
1237                 SW_FLOW_KEY_PUT(match, ct.mark, mark, is_mask);
1238                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_MARK);
1239         }
1240         if (*attrs & (1 << OVS_KEY_ATTR_CT_LABELS) &&
1241             ovs_ct_verify(net, OVS_KEY_ATTR_CT_LABELS)) {
1242                 const struct ovs_key_ct_labels *cl;
1243
1244                 cl = nla_data(a[OVS_KEY_ATTR_CT_LABELS]);
1245                 SW_FLOW_KEY_MEMCPY(match, ct.labels, cl->ct_labels,
1246                                    sizeof(*cl), is_mask);
1247                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_LABELS);
1248         }
1249         if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4)) {
1250                 const struct ovs_key_ct_tuple_ipv4 *ct;
1251
1252                 ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4]);
1253
1254                 SW_FLOW_KEY_PUT(match, ipv4.ct_orig.src, ct->ipv4_src, is_mask);
1255                 SW_FLOW_KEY_PUT(match, ipv4.ct_orig.dst, ct->ipv4_dst, is_mask);
1256                 SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
1257                 SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
1258                 SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv4_proto, is_mask);
1259                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4);
1260         }
1261         if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)) {
1262                 const struct ovs_key_ct_tuple_ipv6 *ct;
1263
1264                 ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6]);
1265
1266                 SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.src, &ct->ipv6_src,
1267                                    sizeof(match->key->ipv6.ct_orig.src),
1268                                    is_mask);
1269                 SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.dst, &ct->ipv6_dst,
1270                                    sizeof(match->key->ipv6.ct_orig.dst),
1271                                    is_mask);
1272                 SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
1273                 SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
1274                 SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv6_proto, is_mask);
1275                 *attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6);
1276         }
1277
1278         /* For layer 3 packets the Ethernet type is provided
1279          * and treated as metadata but no MAC addresses are provided.
1280          */
1281         if (!(*attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) &&
1282             (*attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)))
1283                 mac_proto = MAC_PROTO_NONE;
1284
1285         /* Always exact match mac_proto */
1286         SW_FLOW_KEY_PUT(match, mac_proto, is_mask ? 0xff : mac_proto, is_mask);
1287
1288         if (mac_proto == MAC_PROTO_NONE)
1289                 return parse_eth_type_from_nlattrs(match, attrs, a, is_mask,
1290                                                    log);
1291
1292         return 0;
1293 }
1294
1295 int nsh_hdr_from_nlattr(const struct nlattr *attr,
1296                         struct nshhdr *nh, size_t size)
1297 {
1298         struct nlattr *a;
1299         int rem;
1300         u8 flags = 0;
1301         u8 ttl = 0;
1302         int mdlen = 0;
1303
1304         /* validate_nsh has check this, so we needn't do duplicate check here
1305          */
1306         if (size < NSH_BASE_HDR_LEN)
1307                 return -ENOBUFS;
1308
1309         nla_for_each_nested(a, attr, rem) {
1310                 int type = nla_type(a);
1311
1312                 switch (type) {
1313                 case OVS_NSH_KEY_ATTR_BASE: {
1314                         const struct ovs_nsh_key_base *base = nla_data(a);
1315
1316                         flags = base->flags;
1317                         ttl = base->ttl;
1318                         nh->np = base->np;
1319                         nh->mdtype = base->mdtype;
1320                         nh->path_hdr = base->path_hdr;
1321                         break;
1322                 }
1323                 case OVS_NSH_KEY_ATTR_MD1:
1324                         mdlen = nla_len(a);
1325                         if (mdlen > size - NSH_BASE_HDR_LEN)
1326                                 return -ENOBUFS;
1327                         memcpy(&nh->md1, nla_data(a), mdlen);
1328                         break;
1329
1330                 case OVS_NSH_KEY_ATTR_MD2:
1331                         mdlen = nla_len(a);
1332                         if (mdlen > size - NSH_BASE_HDR_LEN)
1333                                 return -ENOBUFS;
1334                         memcpy(&nh->md2, nla_data(a), mdlen);
1335                         break;
1336
1337                 default:
1338                         return -EINVAL;
1339                 }
1340         }
1341
1342         /* nsh header length  = NSH_BASE_HDR_LEN + mdlen */
1343         nh->ver_flags_ttl_len = 0;
1344         nsh_set_flags_ttl_len(nh, flags, ttl, NSH_BASE_HDR_LEN + mdlen);
1345
1346         return 0;
1347 }
1348
1349 int nsh_key_from_nlattr(const struct nlattr *attr,
1350                         struct ovs_key_nsh *nsh, struct ovs_key_nsh *nsh_mask)
1351 {
1352         struct nlattr *a;
1353         int rem;
1354
1355         /* validate_nsh has check this, so we needn't do duplicate check here
1356          */
1357         nla_for_each_nested(a, attr, rem) {
1358                 int type = nla_type(a);
1359
1360                 switch (type) {
1361                 case OVS_NSH_KEY_ATTR_BASE: {
1362                         const struct ovs_nsh_key_base *base = nla_data(a);
1363                         const struct ovs_nsh_key_base *base_mask = base + 1;
1364
1365                         nsh->base = *base;
1366                         nsh_mask->base = *base_mask;
1367                         break;
1368                 }
1369                 case OVS_NSH_KEY_ATTR_MD1: {
1370                         const struct ovs_nsh_key_md1 *md1 = nla_data(a);
1371                         const struct ovs_nsh_key_md1 *md1_mask = md1 + 1;
1372
1373                         memcpy(nsh->context, md1->context, sizeof(*md1));
1374                         memcpy(nsh_mask->context, md1_mask->context,
1375                                sizeof(*md1_mask));
1376                         break;
1377                 }
1378                 case OVS_NSH_KEY_ATTR_MD2:
1379                         /* Not supported yet */
1380                         return -ENOTSUPP;
1381                 default:
1382                         return -EINVAL;
1383                 }
1384         }
1385
1386         return 0;
1387 }
1388
1389 static int nsh_key_put_from_nlattr(const struct nlattr *attr,
1390                                    struct sw_flow_match *match, bool is_mask,
1391                                    bool is_push_nsh, bool log)
1392 {
1393         struct nlattr *a;
1394         int rem;
1395         bool has_base = false;
1396         bool has_md1 = false;
1397         bool has_md2 = false;
1398         u8 mdtype = 0;
1399         int mdlen = 0;
1400
1401         if (WARN_ON(is_push_nsh && is_mask))
1402                 return -EINVAL;
1403
1404         nla_for_each_nested(a, attr, rem) {
1405                 int type = nla_type(a);
1406                 int i;
1407
1408                 if (type > OVS_NSH_KEY_ATTR_MAX) {
1409                         OVS_NLERR(log, "nsh attr %d is out of range max %d",
1410                                   type, OVS_NSH_KEY_ATTR_MAX);
1411                         return -EINVAL;
1412                 }
1413
1414                 if (!check_attr_len(nla_len(a),
1415                                     ovs_nsh_key_attr_lens[type].len)) {
1416                         OVS_NLERR(
1417                             log,
1418                             "nsh attr %d has unexpected len %d expected %d",
1419                             type,
1420                             nla_len(a),
1421                             ovs_nsh_key_attr_lens[type].len
1422                         );
1423                         return -EINVAL;
1424                 }
1425
1426                 switch (type) {
1427                 case OVS_NSH_KEY_ATTR_BASE: {
1428                         const struct ovs_nsh_key_base *base = nla_data(a);
1429
1430                         has_base = true;
1431                         mdtype = base->mdtype;
1432                         SW_FLOW_KEY_PUT(match, nsh.base.flags,
1433                                         base->flags, is_mask);
1434                         SW_FLOW_KEY_PUT(match, nsh.base.ttl,
1435                                         base->ttl, is_mask);
1436                         SW_FLOW_KEY_PUT(match, nsh.base.mdtype,
1437                                         base->mdtype, is_mask);
1438                         SW_FLOW_KEY_PUT(match, nsh.base.np,
1439                                         base->np, is_mask);
1440                         SW_FLOW_KEY_PUT(match, nsh.base.path_hdr,
1441                                         base->path_hdr, is_mask);
1442                         break;
1443                 }
1444                 case OVS_NSH_KEY_ATTR_MD1: {
1445                         const struct ovs_nsh_key_md1 *md1 = nla_data(a);
1446
1447                         has_md1 = true;
1448                         for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++)
1449                                 SW_FLOW_KEY_PUT(match, nsh.context[i],
1450                                                 md1->context[i], is_mask);
1451                         break;
1452                 }
1453                 case OVS_NSH_KEY_ATTR_MD2:
1454                         if (!is_push_nsh) /* Not supported MD type 2 yet */
1455                                 return -ENOTSUPP;
1456
1457                         has_md2 = true;
1458                         mdlen = nla_len(a);
1459                         if (mdlen > NSH_CTX_HDRS_MAX_LEN || mdlen <= 0) {
1460                                 OVS_NLERR(
1461                                     log,
1462                                     "Invalid MD length %d for MD type %d",
1463                                     mdlen,
1464                                     mdtype
1465                                 );
1466                                 return -EINVAL;
1467                         }
1468                         break;
1469                 default:
1470                         OVS_NLERR(log, "Unknown nsh attribute %d",
1471                                   type);
1472                         return -EINVAL;
1473                 }
1474         }
1475
1476         if (rem > 0) {
1477                 OVS_NLERR(log, "nsh attribute has %d unknown bytes.", rem);
1478                 return -EINVAL;
1479         }
1480
1481         if (has_md1 && has_md2) {
1482                 OVS_NLERR(
1483                     1,
1484                     "invalid nsh attribute: md1 and md2 are exclusive."
1485                 );
1486                 return -EINVAL;
1487         }
1488
1489         if (!is_mask) {
1490                 if ((has_md1 && mdtype != NSH_M_TYPE1) ||
1491                     (has_md2 && mdtype != NSH_M_TYPE2)) {
1492                         OVS_NLERR(1, "nsh attribute has unmatched MD type %d.",
1493                                   mdtype);
1494                         return -EINVAL;
1495                 }
1496
1497                 if (is_push_nsh &&
1498                     (!has_base || (!has_md1 && !has_md2))) {
1499                         OVS_NLERR(
1500                             1,
1501                             "push_nsh: missing base or metadata attributes"
1502                         );
1503                         return -EINVAL;
1504                 }
1505         }
1506
1507         return 0;
1508 }
1509
1510 static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
1511                                 u64 attrs, const struct nlattr **a,
1512                                 bool is_mask, bool log)
1513 {
1514         int err;
1515
1516         err = metadata_from_nlattrs(net, match, &attrs, a, is_mask, log);
1517         if (err)
1518                 return err;
1519
1520         if (attrs & (1 << OVS_KEY_ATTR_ETHERNET)) {
1521                 const struct ovs_key_ethernet *eth_key;
1522
1523                 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
1524                 SW_FLOW_KEY_MEMCPY(match, eth.src,
1525                                 eth_key->eth_src, ETH_ALEN, is_mask);
1526                 SW_FLOW_KEY_MEMCPY(match, eth.dst,
1527                                 eth_key->eth_dst, ETH_ALEN, is_mask);
1528                 attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET);
1529
1530                 if (attrs & (1 << OVS_KEY_ATTR_VLAN)) {
1531                         /* VLAN attribute is always parsed before getting here since it
1532                          * may occur multiple times.
1533                          */
1534                         OVS_NLERR(log, "VLAN attribute unexpected.");
1535                         return -EINVAL;
1536                 }
1537
1538                 if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
1539                         err = parse_eth_type_from_nlattrs(match, &attrs, a, is_mask,
1540                                                           log);
1541                         if (err)
1542                                 return err;
1543                 } else if (!is_mask) {
1544                         SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
1545                 }
1546         } else if (!match->key->eth.type) {
1547                 OVS_NLERR(log, "Either Ethernet header or EtherType is required.");
1548                 return -EINVAL;
1549         }
1550
1551         if (attrs & (1 << OVS_KEY_ATTR_IPV4)) {
1552                 const struct ovs_key_ipv4 *ipv4_key;
1553
1554                 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
1555                 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
1556                         OVS_NLERR(log, "IPv4 frag type %d is out of range max %d",
1557                                   ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
1558                         return -EINVAL;
1559                 }
1560                 SW_FLOW_KEY_PUT(match, ip.proto,
1561                                 ipv4_key->ipv4_proto, is_mask);
1562                 SW_FLOW_KEY_PUT(match, ip.tos,
1563                                 ipv4_key->ipv4_tos, is_mask);
1564                 SW_FLOW_KEY_PUT(match, ip.ttl,
1565                                 ipv4_key->ipv4_ttl, is_mask);
1566                 SW_FLOW_KEY_PUT(match, ip.frag,
1567                                 ipv4_key->ipv4_frag, is_mask);
1568                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
1569                                 ipv4_key->ipv4_src, is_mask);
1570                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
1571                                 ipv4_key->ipv4_dst, is_mask);
1572                 attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
1573         }
1574
1575         if (attrs & (1 << OVS_KEY_ATTR_IPV6)) {
1576                 const struct ovs_key_ipv6 *ipv6_key;
1577
1578                 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
1579                 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
1580                         OVS_NLERR(log, "IPv6 frag type %d is out of range max %d",
1581                                   ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
1582                         return -EINVAL;
1583                 }
1584
1585                 if (!is_mask && ipv6_key->ipv6_label & htonl(0xFFF00000)) {
1586                         OVS_NLERR(log, "IPv6 flow label %x is out of range (max=%x)",
1587                                   ntohl(ipv6_key->ipv6_label), (1 << 20) - 1);
1588                         return -EINVAL;
1589                 }
1590
1591                 SW_FLOW_KEY_PUT(match, ipv6.label,
1592                                 ipv6_key->ipv6_label, is_mask);
1593                 SW_FLOW_KEY_PUT(match, ip.proto,
1594                                 ipv6_key->ipv6_proto, is_mask);
1595                 SW_FLOW_KEY_PUT(match, ip.tos,
1596                                 ipv6_key->ipv6_tclass, is_mask);
1597                 SW_FLOW_KEY_PUT(match, ip.ttl,
1598                                 ipv6_key->ipv6_hlimit, is_mask);
1599                 SW_FLOW_KEY_PUT(match, ip.frag,
1600                                 ipv6_key->ipv6_frag, is_mask);
1601                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
1602                                 ipv6_key->ipv6_src,
1603                                 sizeof(match->key->ipv6.addr.src),
1604                                 is_mask);
1605                 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
1606                                 ipv6_key->ipv6_dst,
1607                                 sizeof(match->key->ipv6.addr.dst),
1608                                 is_mask);
1609
1610                 attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
1611         }
1612
1613         if (attrs & (1ULL << OVS_KEY_ATTR_IPV6_EXTHDRS)) {
1614                 const struct ovs_key_ipv6_exthdrs *ipv6_exthdrs_key;
1615
1616                 ipv6_exthdrs_key = nla_data(a[OVS_KEY_ATTR_IPV6_EXTHDRS]);
1617
1618                 SW_FLOW_KEY_PUT(match, ipv6.exthdrs,
1619                                 ipv6_exthdrs_key->hdrs, is_mask);
1620
1621                 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV6_EXTHDRS);
1622         }
1623
1624         if (attrs & (1 << OVS_KEY_ATTR_ARP)) {
1625                 const struct ovs_key_arp *arp_key;
1626
1627                 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
1628                 if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
1629                         OVS_NLERR(log, "Unknown ARP opcode (opcode=%d).",
1630                                   arp_key->arp_op);
1631                         return -EINVAL;
1632                 }
1633
1634                 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
1635                                 arp_key->arp_sip, is_mask);
1636                 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
1637                         arp_key->arp_tip, is_mask);
1638                 SW_FLOW_KEY_PUT(match, ip.proto,
1639                                 ntohs(arp_key->arp_op), is_mask);
1640                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
1641                                 arp_key->arp_sha, ETH_ALEN, is_mask);
1642                 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
1643                                 arp_key->arp_tha, ETH_ALEN, is_mask);
1644
1645                 attrs &= ~(1 << OVS_KEY_ATTR_ARP);
1646         }
1647
1648         if (attrs & (1 << OVS_KEY_ATTR_NSH)) {
1649                 if (nsh_key_put_from_nlattr(a[OVS_KEY_ATTR_NSH], match,
1650                                             is_mask, false, log) < 0)
1651                         return -EINVAL;
1652                 attrs &= ~(1 << OVS_KEY_ATTR_NSH);
1653         }
1654
1655         if (attrs & (1 << OVS_KEY_ATTR_MPLS)) {
1656                 const struct ovs_key_mpls *mpls_key;
1657                 u32 hdr_len;
1658                 u32 label_count, label_count_mask, i;
1659
1660                 mpls_key = nla_data(a[OVS_KEY_ATTR_MPLS]);
1661                 hdr_len = nla_len(a[OVS_KEY_ATTR_MPLS]);
1662                 label_count = hdr_len / sizeof(struct ovs_key_mpls);
1663
1664                 if (label_count == 0 || label_count > MPLS_LABEL_DEPTH ||
1665                     hdr_len % sizeof(struct ovs_key_mpls))
1666                         return -EINVAL;
1667
1668                 label_count_mask =  GENMASK(label_count - 1, 0);
1669
1670                 for (i = 0 ; i < label_count; i++)
1671                         SW_FLOW_KEY_PUT(match, mpls.lse[i],
1672                                         mpls_key[i].mpls_lse, is_mask);
1673
1674                 SW_FLOW_KEY_PUT(match, mpls.num_labels_mask,
1675                                 label_count_mask, is_mask);
1676
1677                 attrs &= ~(1 << OVS_KEY_ATTR_MPLS);
1678          }
1679
1680         if (attrs & (1 << OVS_KEY_ATTR_TCP)) {
1681                 const struct ovs_key_tcp *tcp_key;
1682
1683                 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
1684                 SW_FLOW_KEY_PUT(match, tp.src, tcp_key->tcp_src, is_mask);
1685                 SW_FLOW_KEY_PUT(match, tp.dst, tcp_key->tcp_dst, is_mask);
1686                 attrs &= ~(1 << OVS_KEY_ATTR_TCP);
1687         }
1688
1689         if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) {
1690                 SW_FLOW_KEY_PUT(match, tp.flags,
1691                                 nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
1692                                 is_mask);
1693                 attrs &= ~(1 << OVS_KEY_ATTR_TCP_FLAGS);
1694         }
1695
1696         if (attrs & (1 << OVS_KEY_ATTR_UDP)) {
1697                 const struct ovs_key_udp *udp_key;
1698
1699                 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
1700                 SW_FLOW_KEY_PUT(match, tp.src, udp_key->udp_src, is_mask);
1701                 SW_FLOW_KEY_PUT(match, tp.dst, udp_key->udp_dst, is_mask);
1702                 attrs &= ~(1 << OVS_KEY_ATTR_UDP);
1703         }
1704
1705         if (attrs & (1 << OVS_KEY_ATTR_SCTP)) {
1706                 const struct ovs_key_sctp *sctp_key;
1707
1708                 sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
1709                 SW_FLOW_KEY_PUT(match, tp.src, sctp_key->sctp_src, is_mask);
1710                 SW_FLOW_KEY_PUT(match, tp.dst, sctp_key->sctp_dst, is_mask);
1711                 attrs &= ~(1 << OVS_KEY_ATTR_SCTP);
1712         }
1713
1714         if (attrs & (1 << OVS_KEY_ATTR_ICMP)) {
1715                 const struct ovs_key_icmp *icmp_key;
1716
1717                 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
1718                 SW_FLOW_KEY_PUT(match, tp.src,
1719                                 htons(icmp_key->icmp_type), is_mask);
1720                 SW_FLOW_KEY_PUT(match, tp.dst,
1721                                 htons(icmp_key->icmp_code), is_mask);
1722                 attrs &= ~(1 << OVS_KEY_ATTR_ICMP);
1723         }
1724
1725         if (attrs & (1 << OVS_KEY_ATTR_ICMPV6)) {
1726                 const struct ovs_key_icmpv6 *icmpv6_key;
1727
1728                 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
1729                 SW_FLOW_KEY_PUT(match, tp.src,
1730                                 htons(icmpv6_key->icmpv6_type), is_mask);
1731                 SW_FLOW_KEY_PUT(match, tp.dst,
1732                                 htons(icmpv6_key->icmpv6_code), is_mask);
1733                 attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6);
1734         }
1735
1736         if (attrs & (1 << OVS_KEY_ATTR_ND)) {
1737                 const struct ovs_key_nd *nd_key;
1738
1739                 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
1740                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
1741                         nd_key->nd_target,
1742                         sizeof(match->key->ipv6.nd.target),
1743                         is_mask);
1744                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
1745                         nd_key->nd_sll, ETH_ALEN, is_mask);
1746                 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
1747                                 nd_key->nd_tll, ETH_ALEN, is_mask);
1748                 attrs &= ~(1 << OVS_KEY_ATTR_ND);
1749         }
1750
1751         if (attrs != 0) {
1752                 OVS_NLERR(log, "Unknown key attributes %llx",
1753                           (unsigned long long)attrs);
1754                 return -EINVAL;
1755         }
1756
1757         return 0;
1758 }
1759
1760 static void nlattr_set(struct nlattr *attr, u8 val,
1761                        const struct ovs_len_tbl *tbl)
1762 {
1763         struct nlattr *nla;
1764         int rem;
1765
1766         /* The nlattr stream should already have been validated */
1767         nla_for_each_nested(nla, attr, rem) {
1768                 if (tbl[nla_type(nla)].len == OVS_ATTR_NESTED)
1769                         nlattr_set(nla, val, tbl[nla_type(nla)].next ? : tbl);
1770                 else
1771                         memset(nla_data(nla), val, nla_len(nla));
1772
1773                 if (nla_type(nla) == OVS_KEY_ATTR_CT_STATE)
1774                         *(u32 *)nla_data(nla) &= CT_SUPPORTED_MASK;
1775         }
1776 }
1777
1778 static void mask_set_nlattr(struct nlattr *attr, u8 val)
1779 {
1780         nlattr_set(attr, val, ovs_key_lens);
1781 }
1782
1783 /**
1784  * ovs_nla_get_match - parses Netlink attributes into a flow key and
1785  * mask. In case the 'mask' is NULL, the flow is treated as exact match
1786  * flow. Otherwise, it is treated as a wildcarded flow, except the mask
1787  * does not include any don't care bit.
1788  * @net: Used to determine per-namespace field support.
1789  * @match: receives the extracted flow match information.
1790  * @nla_key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1791  * sequence. The fields should of the packet that triggered the creation
1792  * of this flow.
1793  * @nla_mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_*
1794  * Netlink attribute specifies the mask field of the wildcarded flow.
1795  * @log: Boolean to allow kernel error logging.  Normally true, but when
1796  * probing for feature compatibility this should be passed in as false to
1797  * suppress unnecessary error logging.
1798  */
1799 int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
1800                       const struct nlattr *nla_key,
1801                       const struct nlattr *nla_mask,
1802                       bool log)
1803 {
1804         const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1805         struct nlattr *newmask = NULL;
1806         u64 key_attrs = 0;
1807         u64 mask_attrs = 0;
1808         int err;
1809
1810         err = parse_flow_nlattrs(nla_key, a, &key_attrs, log);
1811         if (err)
1812                 return err;
1813
1814         err = parse_vlan_from_nlattrs(match, &key_attrs, a, false, log);
1815         if (err)
1816                 return err;
1817
1818         err = ovs_key_from_nlattrs(net, match, key_attrs, a, false, log);
1819         if (err)
1820                 return err;
1821
1822         if (match->mask) {
1823                 if (!nla_mask) {
1824                         /* Create an exact match mask. We need to set to 0xff
1825                          * all the 'match->mask' fields that have been touched
1826                          * in 'match->key'. We cannot simply memset
1827                          * 'match->mask', because padding bytes and fields not
1828                          * specified in 'match->key' should be left to 0.
1829                          * Instead, we use a stream of netlink attributes,
1830                          * copied from 'key' and set to 0xff.
1831                          * ovs_key_from_nlattrs() will take care of filling
1832                          * 'match->mask' appropriately.
1833                          */
1834                         newmask = kmemdup(nla_key,
1835                                           nla_total_size(nla_len(nla_key)),
1836                                           GFP_KERNEL);
1837                         if (!newmask)
1838                                 return -ENOMEM;
1839
1840                         mask_set_nlattr(newmask, 0xff);
1841
1842                         /* The userspace does not send tunnel attributes that
1843                          * are 0, but we should not wildcard them nonetheless.
1844                          */
1845                         if (match->key->tun_proto)
1846                                 SW_FLOW_KEY_MEMSET_FIELD(match, tun_key,
1847                                                          0xff, true);
1848
1849                         nla_mask = newmask;
1850                 }
1851
1852                 err = parse_flow_mask_nlattrs(nla_mask, a, &mask_attrs, log);
1853                 if (err)
1854                         goto free_newmask;
1855
1856                 /* Always match on tci. */
1857                 SW_FLOW_KEY_PUT(match, eth.vlan.tci, htons(0xffff), true);
1858                 SW_FLOW_KEY_PUT(match, eth.cvlan.tci, htons(0xffff), true);
1859
1860                 err = parse_vlan_from_nlattrs(match, &mask_attrs, a, true, log);
1861                 if (err)
1862                         goto free_newmask;
1863
1864                 err = ovs_key_from_nlattrs(net, match, mask_attrs, a, true,
1865                                            log);
1866                 if (err)
1867                         goto free_newmask;
1868         }
1869
1870         if (!match_validate(match, key_attrs, mask_attrs, log))
1871                 err = -EINVAL;
1872
1873 free_newmask:
1874         kfree(newmask);
1875         return err;
1876 }
1877
1878 static size_t get_ufid_len(const struct nlattr *attr, bool log)
1879 {
1880         size_t len;
1881
1882         if (!attr)
1883                 return 0;
1884
1885         len = nla_len(attr);
1886         if (len < 1 || len > MAX_UFID_LENGTH) {
1887                 OVS_NLERR(log, "ufid size %u bytes exceeds the range (1, %d)",
1888                           nla_len(attr), MAX_UFID_LENGTH);
1889                 return 0;
1890         }
1891
1892         return len;
1893 }
1894
1895 /* Initializes 'flow->ufid', returning true if 'attr' contains a valid UFID,
1896  * or false otherwise.
1897  */
1898 bool ovs_nla_get_ufid(struct sw_flow_id *sfid, const struct nlattr *attr,
1899                       bool log)
1900 {
1901         sfid->ufid_len = get_ufid_len(attr, log);
1902         if (sfid->ufid_len)
1903                 memcpy(sfid->ufid, nla_data(attr), sfid->ufid_len);
1904
1905         return sfid->ufid_len;
1906 }
1907
1908 int ovs_nla_get_identifier(struct sw_flow_id *sfid, const struct nlattr *ufid,
1909                            const struct sw_flow_key *key, bool log)
1910 {
1911         struct sw_flow_key *new_key;
1912
1913         if (ovs_nla_get_ufid(sfid, ufid, log))
1914                 return 0;
1915
1916         /* If UFID was not provided, use unmasked key. */
1917         new_key = kmalloc(sizeof(*new_key), GFP_KERNEL);
1918         if (!new_key)
1919                 return -ENOMEM;
1920         memcpy(new_key, key, sizeof(*key));
1921         sfid->unmasked_key = new_key;
1922
1923         return 0;
1924 }
1925
1926 u32 ovs_nla_get_ufid_flags(const struct nlattr *attr)
1927 {
1928         return attr ? nla_get_u32(attr) : 0;
1929 }
1930
1931 /**
1932  * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
1933  * @net: Network namespace.
1934  * @key: Receives extracted in_port, priority, tun_key, skb_mark and conntrack
1935  * metadata.
1936  * @a: Array of netlink attributes holding parsed %OVS_KEY_ATTR_* Netlink
1937  * attributes.
1938  * @attrs: Bit mask for the netlink attributes included in @a.
1939  * @log: Boolean to allow kernel error logging.  Normally true, but when
1940  * probing for feature compatibility this should be passed in as false to
1941  * suppress unnecessary error logging.
1942  *
1943  * This parses a series of Netlink attributes that form a flow key, which must
1944  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
1945  * get the metadata, that is, the parts of the flow key that cannot be
1946  * extracted from the packet itself.
1947  *
1948  * This must be called before the packet key fields are filled in 'key'.
1949  */
1950
1951 int ovs_nla_get_flow_metadata(struct net *net,
1952                               const struct nlattr *a[OVS_KEY_ATTR_MAX + 1],
1953                               u64 attrs, struct sw_flow_key *key, bool log)
1954 {
1955         struct sw_flow_match match;
1956
1957         memset(&match, 0, sizeof(match));
1958         match.key = key;
1959
1960         key->ct_state = 0;
1961         key->ct_zone = 0;
1962         key->ct_orig_proto = 0;
1963         memset(&key->ct, 0, sizeof(key->ct));
1964         memset(&key->ipv4.ct_orig, 0, sizeof(key->ipv4.ct_orig));
1965         memset(&key->ipv6.ct_orig, 0, sizeof(key->ipv6.ct_orig));
1966
1967         key->phy.in_port = DP_MAX_PORTS;
1968
1969         return metadata_from_nlattrs(net, &match, &attrs, a, false, log);
1970 }
1971
1972 static int ovs_nla_put_vlan(struct sk_buff *skb, const struct vlan_head *vh,
1973                             bool is_mask)
1974 {
1975         __be16 eth_type = !is_mask ? vh->tpid : htons(0xffff);
1976
1977         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
1978             nla_put_be16(skb, OVS_KEY_ATTR_VLAN, vh->tci))
1979                 return -EMSGSIZE;
1980         return 0;
1981 }
1982
1983 static int nsh_key_to_nlattr(const struct ovs_key_nsh *nsh, bool is_mask,
1984                              struct sk_buff *skb)
1985 {
1986         struct nlattr *start;
1987
1988         start = nla_nest_start_noflag(skb, OVS_KEY_ATTR_NSH);
1989         if (!start)
1990                 return -EMSGSIZE;
1991
1992         if (nla_put(skb, OVS_NSH_KEY_ATTR_BASE, sizeof(nsh->base), &nsh->base))
1993                 goto nla_put_failure;
1994
1995         if (is_mask || nsh->base.mdtype == NSH_M_TYPE1) {
1996                 if (nla_put(skb, OVS_NSH_KEY_ATTR_MD1,
1997                             sizeof(nsh->context), nsh->context))
1998                         goto nla_put_failure;
1999         }
2000
2001         /* Don't support MD type 2 yet */
2002
2003         nla_nest_end(skb, start);
2004
2005         return 0;
2006
2007 nla_put_failure:
2008         return -EMSGSIZE;
2009 }
2010
2011 static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
2012                              const struct sw_flow_key *output, bool is_mask,
2013                              struct sk_buff *skb)
2014 {
2015         struct ovs_key_ethernet *eth_key;
2016         struct nlattr *nla;
2017         struct nlattr *encap = NULL;
2018         struct nlattr *in_encap = NULL;
2019
2020         if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id))
2021                 goto nla_put_failure;
2022
2023         if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash))
2024                 goto nla_put_failure;
2025
2026         if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
2027                 goto nla_put_failure;
2028
2029         if ((swkey->tun_proto || is_mask)) {
2030                 const void *opts = NULL;
2031
2032                 if (output->tun_key.tun_flags & TUNNEL_OPTIONS_PRESENT)
2033                         opts = TUN_METADATA_OPTS(output, swkey->tun_opts_len);
2034
2035                 if (ip_tun_to_nlattr(skb, &output->tun_key, opts,
2036                                      swkey->tun_opts_len, swkey->tun_proto, 0))
2037                         goto nla_put_failure;
2038         }
2039
2040         if (swkey->phy.in_port == DP_MAX_PORTS) {
2041                 if (is_mask && (output->phy.in_port == 0xffff))
2042                         if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
2043                                 goto nla_put_failure;
2044         } else {
2045                 u16 upper_u16;
2046                 upper_u16 = !is_mask ? 0 : 0xffff;
2047
2048                 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
2049                                 (upper_u16 << 16) | output->phy.in_port))
2050                         goto nla_put_failure;
2051         }
2052
2053         if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
2054                 goto nla_put_failure;
2055
2056         if (ovs_ct_put_key(swkey, output, skb))
2057                 goto nla_put_failure;
2058
2059         if (ovs_key_mac_proto(swkey) == MAC_PROTO_ETHERNET) {
2060                 nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
2061                 if (!nla)
2062                         goto nla_put_failure;
2063
2064                 eth_key = nla_data(nla);
2065                 ether_addr_copy(eth_key->eth_src, output->eth.src);
2066                 ether_addr_copy(eth_key->eth_dst, output->eth.dst);
2067
2068                 if (swkey->eth.vlan.tci || eth_type_vlan(swkey->eth.type)) {
2069                         if (ovs_nla_put_vlan(skb, &output->eth.vlan, is_mask))
2070                                 goto nla_put_failure;
2071                         encap = nla_nest_start_noflag(skb, OVS_KEY_ATTR_ENCAP);
2072                         if (!swkey->eth.vlan.tci)
2073                                 goto unencap;
2074
2075                         if (swkey->eth.cvlan.tci || eth_type_vlan(swkey->eth.type)) {
2076                                 if (ovs_nla_put_vlan(skb, &output->eth.cvlan, is_mask))
2077                                         goto nla_put_failure;
2078                                 in_encap = nla_nest_start_noflag(skb,
2079                                                                  OVS_KEY_ATTR_ENCAP);
2080                                 if (!swkey->eth.cvlan.tci)
2081                                         goto unencap;
2082                         }
2083                 }
2084
2085                 if (swkey->eth.type == htons(ETH_P_802_2)) {
2086                         /*
2087                         * Ethertype 802.2 is represented in the netlink with omitted
2088                         * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
2089                         * 0xffff in the mask attribute.  Ethertype can also
2090                         * be wildcarded.
2091                         */
2092                         if (is_mask && output->eth.type)
2093                                 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
2094                                                         output->eth.type))
2095                                         goto nla_put_failure;
2096                         goto unencap;
2097                 }
2098         }
2099
2100         if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
2101                 goto nla_put_failure;
2102
2103         if (eth_type_vlan(swkey->eth.type)) {
2104                 /* There are 3 VLAN tags, we don't know anything about the rest
2105                  * of the packet, so truncate here.
2106                  */
2107                 WARN_ON_ONCE(!(encap && in_encap));
2108                 goto unencap;
2109         }
2110
2111         if (swkey->eth.type == htons(ETH_P_IP)) {
2112                 struct ovs_key_ipv4 *ipv4_key;
2113
2114                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
2115                 if (!nla)
2116                         goto nla_put_failure;
2117                 ipv4_key = nla_data(nla);
2118                 ipv4_key->ipv4_src = output->ipv4.addr.src;
2119                 ipv4_key->ipv4_dst = output->ipv4.addr.dst;
2120                 ipv4_key->ipv4_proto = output->ip.proto;
2121                 ipv4_key->ipv4_tos = output->ip.tos;
2122                 ipv4_key->ipv4_ttl = output->ip.ttl;
2123                 ipv4_key->ipv4_frag = output->ip.frag;
2124         } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
2125                 struct ovs_key_ipv6 *ipv6_key;
2126                 struct ovs_key_ipv6_exthdrs *ipv6_exthdrs_key;
2127
2128                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
2129                 if (!nla)
2130                         goto nla_put_failure;
2131                 ipv6_key = nla_data(nla);
2132                 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
2133                                 sizeof(ipv6_key->ipv6_src));
2134                 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
2135                                 sizeof(ipv6_key->ipv6_dst));
2136                 ipv6_key->ipv6_label = output->ipv6.label;
2137                 ipv6_key->ipv6_proto = output->ip.proto;
2138                 ipv6_key->ipv6_tclass = output->ip.tos;
2139                 ipv6_key->ipv6_hlimit = output->ip.ttl;
2140                 ipv6_key->ipv6_frag = output->ip.frag;
2141
2142                 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6_EXTHDRS,
2143                                   sizeof(*ipv6_exthdrs_key));
2144                 if (!nla)
2145                         goto nla_put_failure;
2146                 ipv6_exthdrs_key = nla_data(nla);
2147                 ipv6_exthdrs_key->hdrs = output->ipv6.exthdrs;
2148         } else if (swkey->eth.type == htons(ETH_P_NSH)) {
2149                 if (nsh_key_to_nlattr(&output->nsh, is_mask, skb))
2150                         goto nla_put_failure;
2151         } else if (swkey->eth.type == htons(ETH_P_ARP) ||
2152                    swkey->eth.type == htons(ETH_P_RARP)) {
2153                 struct ovs_key_arp *arp_key;
2154
2155                 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
2156                 if (!nla)
2157                         goto nla_put_failure;
2158                 arp_key = nla_data(nla);
2159                 memset(arp_key, 0, sizeof(struct ovs_key_arp));
2160                 arp_key->arp_sip = output->ipv4.addr.src;
2161                 arp_key->arp_tip = output->ipv4.addr.dst;
2162                 arp_key->arp_op = htons(output->ip.proto);
2163                 ether_addr_copy(arp_key->arp_sha, output->ipv4.arp.sha);
2164                 ether_addr_copy(arp_key->arp_tha, output->ipv4.arp.tha);
2165         } else if (eth_p_mpls(swkey->eth.type)) {
2166                 u8 i, num_labels;
2167                 struct ovs_key_mpls *mpls_key;
2168
2169                 num_labels = hweight_long(output->mpls.num_labels_mask);
2170                 nla = nla_reserve(skb, OVS_KEY_ATTR_MPLS,
2171                                   num_labels * sizeof(*mpls_key));
2172                 if (!nla)
2173                         goto nla_put_failure;
2174
2175                 mpls_key = nla_data(nla);
2176                 for (i = 0; i < num_labels; i++)
2177                         mpls_key[i].mpls_lse = output->mpls.lse[i];
2178         }
2179
2180         if ((swkey->eth.type == htons(ETH_P_IP) ||
2181              swkey->eth.type == htons(ETH_P_IPV6)) &&
2182              swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
2183
2184                 if (swkey->ip.proto == IPPROTO_TCP) {
2185                         struct ovs_key_tcp *tcp_key;
2186
2187                         nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
2188                         if (!nla)
2189                                 goto nla_put_failure;
2190                         tcp_key = nla_data(nla);
2191                         tcp_key->tcp_src = output->tp.src;
2192                         tcp_key->tcp_dst = output->tp.dst;
2193                         if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
2194                                          output->tp.flags))
2195                                 goto nla_put_failure;
2196                 } else if (swkey->ip.proto == IPPROTO_UDP) {
2197                         struct ovs_key_udp *udp_key;
2198
2199                         nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
2200                         if (!nla)
2201                                 goto nla_put_failure;
2202                         udp_key = nla_data(nla);
2203                         udp_key->udp_src = output->tp.src;
2204                         udp_key->udp_dst = output->tp.dst;
2205                 } else if (swkey->ip.proto == IPPROTO_SCTP) {
2206                         struct ovs_key_sctp *sctp_key;
2207
2208                         nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
2209                         if (!nla)
2210                                 goto nla_put_failure;
2211                         sctp_key = nla_data(nla);
2212                         sctp_key->sctp_src = output->tp.src;
2213                         sctp_key->sctp_dst = output->tp.dst;
2214                 } else if (swkey->eth.type == htons(ETH_P_IP) &&
2215                            swkey->ip.proto == IPPROTO_ICMP) {
2216                         struct ovs_key_icmp *icmp_key;
2217
2218                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
2219                         if (!nla)
2220                                 goto nla_put_failure;
2221                         icmp_key = nla_data(nla);
2222                         icmp_key->icmp_type = ntohs(output->tp.src);
2223                         icmp_key->icmp_code = ntohs(output->tp.dst);
2224                 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
2225                            swkey->ip.proto == IPPROTO_ICMPV6) {
2226                         struct ovs_key_icmpv6 *icmpv6_key;
2227
2228                         nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
2229                                                 sizeof(*icmpv6_key));
2230                         if (!nla)
2231                                 goto nla_put_failure;
2232                         icmpv6_key = nla_data(nla);
2233                         icmpv6_key->icmpv6_type = ntohs(output->tp.src);
2234                         icmpv6_key->icmpv6_code = ntohs(output->tp.dst);
2235
2236                         if (swkey->tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) ||
2237                             swkey->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
2238                                 struct ovs_key_nd *nd_key;
2239
2240                                 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
2241                                 if (!nla)
2242                                         goto nla_put_failure;
2243                                 nd_key = nla_data(nla);
2244                                 memcpy(nd_key->nd_target, &output->ipv6.nd.target,
2245                                                         sizeof(nd_key->nd_target));
2246                                 ether_addr_copy(nd_key->nd_sll, output->ipv6.nd.sll);
2247                                 ether_addr_copy(nd_key->nd_tll, output->ipv6.nd.tll);
2248                         }
2249                 }
2250         }
2251
2252 unencap:
2253         if (in_encap)
2254                 nla_nest_end(skb, in_encap);
2255         if (encap)
2256                 nla_nest_end(skb, encap);
2257
2258         return 0;
2259
2260 nla_put_failure:
2261         return -EMSGSIZE;
2262 }
2263
2264 int ovs_nla_put_key(const struct sw_flow_key *swkey,
2265                     const struct sw_flow_key *output, int attr, bool is_mask,
2266                     struct sk_buff *skb)
2267 {
2268         int err;
2269         struct nlattr *nla;
2270
2271         nla = nla_nest_start_noflag(skb, attr);
2272         if (!nla)
2273                 return -EMSGSIZE;
2274         err = __ovs_nla_put_key(swkey, output, is_mask, skb);
2275         if (err)
2276                 return err;
2277         nla_nest_end(skb, nla);
2278
2279         return 0;
2280 }
2281
2282 /* Called with ovs_mutex or RCU read lock. */
2283 int ovs_nla_put_identifier(const struct sw_flow *flow, struct sk_buff *skb)
2284 {
2285         if (ovs_identifier_is_ufid(&flow->id))
2286                 return nla_put(skb, OVS_FLOW_ATTR_UFID, flow->id.ufid_len,
2287                                flow->id.ufid);
2288
2289         return ovs_nla_put_key(flow->id.unmasked_key, flow->id.unmasked_key,
2290                                OVS_FLOW_ATTR_KEY, false, skb);
2291 }
2292
2293 /* Called with ovs_mutex or RCU read lock. */
2294 int ovs_nla_put_masked_key(const struct sw_flow *flow, struct sk_buff *skb)
2295 {
2296         return ovs_nla_put_key(&flow->key, &flow->key,
2297                                 OVS_FLOW_ATTR_KEY, false, skb);
2298 }
2299
2300 /* Called with ovs_mutex or RCU read lock. */
2301 int ovs_nla_put_mask(const struct sw_flow *flow, struct sk_buff *skb)
2302 {
2303         return ovs_nla_put_key(&flow->key, &flow->mask->key,
2304                                 OVS_FLOW_ATTR_MASK, true, skb);
2305 }
2306
2307 #define MAX_ACTIONS_BUFSIZE     (32 * 1024)
2308
2309 static struct sw_flow_actions *nla_alloc_flow_actions(int size)
2310 {
2311         struct sw_flow_actions *sfa;
2312
2313         WARN_ON_ONCE(size > MAX_ACTIONS_BUFSIZE);
2314
2315         sfa = kmalloc(kmalloc_size_roundup(sizeof(*sfa) + size), GFP_KERNEL);
2316         if (!sfa)
2317                 return ERR_PTR(-ENOMEM);
2318
2319         sfa->actions_len = 0;
2320         return sfa;
2321 }
2322
2323 static void ovs_nla_free_nested_actions(const struct nlattr *actions, int len);
2324
2325 static void ovs_nla_free_check_pkt_len_action(const struct nlattr *action)
2326 {
2327         const struct nlattr *a;
2328         int rem;
2329
2330         nla_for_each_nested(a, action, rem) {
2331                 switch (nla_type(a)) {
2332                 case OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL:
2333                 case OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER:
2334                         ovs_nla_free_nested_actions(nla_data(a), nla_len(a));
2335                         break;
2336                 }
2337         }
2338 }
2339
2340 static void ovs_nla_free_clone_action(const struct nlattr *action)
2341 {
2342         const struct nlattr *a = nla_data(action);
2343         int rem = nla_len(action);
2344
2345         switch (nla_type(a)) {
2346         case OVS_CLONE_ATTR_EXEC:
2347                 /* The real list of actions follows this attribute. */
2348                 a = nla_next(a, &rem);
2349                 ovs_nla_free_nested_actions(a, rem);
2350                 break;
2351         }
2352 }
2353
2354 static void ovs_nla_free_dec_ttl_action(const struct nlattr *action)
2355 {
2356         const struct nlattr *a = nla_data(action);
2357
2358         switch (nla_type(a)) {
2359         case OVS_DEC_TTL_ATTR_ACTION:
2360                 ovs_nla_free_nested_actions(nla_data(a), nla_len(a));
2361                 break;
2362         }
2363 }
2364
2365 static void ovs_nla_free_sample_action(const struct nlattr *action)
2366 {
2367         const struct nlattr *a = nla_data(action);
2368         int rem = nla_len(action);
2369
2370         switch (nla_type(a)) {
2371         case OVS_SAMPLE_ATTR_ARG:
2372                 /* The real list of actions follows this attribute. */
2373                 a = nla_next(a, &rem);
2374                 ovs_nla_free_nested_actions(a, rem);
2375                 break;
2376         }
2377 }
2378
2379 static void ovs_nla_free_set_action(const struct nlattr *a)
2380 {
2381         const struct nlattr *ovs_key = nla_data(a);
2382         struct ovs_tunnel_info *ovs_tun;
2383
2384         switch (nla_type(ovs_key)) {
2385         case OVS_KEY_ATTR_TUNNEL_INFO:
2386                 ovs_tun = nla_data(ovs_key);
2387                 dst_release((struct dst_entry *)ovs_tun->tun_dst);
2388                 break;
2389         }
2390 }
2391
2392 static void ovs_nla_free_nested_actions(const struct nlattr *actions, int len)
2393 {
2394         const struct nlattr *a;
2395         int rem;
2396
2397         /* Whenever new actions are added, the need to update this
2398          * function should be considered.
2399          */
2400         BUILD_BUG_ON(OVS_ACTION_ATTR_MAX != 24);
2401
2402         if (!actions)
2403                 return;
2404
2405         nla_for_each_attr(a, actions, len, rem) {
2406                 switch (nla_type(a)) {
2407                 case OVS_ACTION_ATTR_CHECK_PKT_LEN:
2408                         ovs_nla_free_check_pkt_len_action(a);
2409                         break;
2410
2411                 case OVS_ACTION_ATTR_CLONE:
2412                         ovs_nla_free_clone_action(a);
2413                         break;
2414
2415                 case OVS_ACTION_ATTR_CT:
2416                         ovs_ct_free_action(a);
2417                         break;
2418
2419                 case OVS_ACTION_ATTR_DEC_TTL:
2420                         ovs_nla_free_dec_ttl_action(a);
2421                         break;
2422
2423                 case OVS_ACTION_ATTR_SAMPLE:
2424                         ovs_nla_free_sample_action(a);
2425                         break;
2426
2427                 case OVS_ACTION_ATTR_SET:
2428                         ovs_nla_free_set_action(a);
2429                         break;
2430                 }
2431         }
2432 }
2433
2434 void ovs_nla_free_flow_actions(struct sw_flow_actions *sf_acts)
2435 {
2436         if (!sf_acts)
2437                 return;
2438
2439         ovs_nla_free_nested_actions(sf_acts->actions, sf_acts->actions_len);
2440         kfree(sf_acts);
2441 }
2442
2443 static void __ovs_nla_free_flow_actions(struct rcu_head *head)
2444 {
2445         ovs_nla_free_flow_actions(container_of(head, struct sw_flow_actions, rcu));
2446 }
2447
2448 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
2449  * The caller must hold rcu_read_lock for this to be sensible. */
2450 void ovs_nla_free_flow_actions_rcu(struct sw_flow_actions *sf_acts)
2451 {
2452         call_rcu(&sf_acts->rcu, __ovs_nla_free_flow_actions);
2453 }
2454
2455 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
2456                                        int attr_len, bool log)
2457 {
2458
2459         struct sw_flow_actions *acts;
2460         int new_acts_size;
2461         size_t req_size = NLA_ALIGN(attr_len);
2462         int next_offset = offsetof(struct sw_flow_actions, actions) +
2463                                         (*sfa)->actions_len;
2464
2465         if (req_size <= (ksize(*sfa) - next_offset))
2466                 goto out;
2467
2468         new_acts_size = max(next_offset + req_size, ksize(*sfa) * 2);
2469
2470         if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
2471                 if ((next_offset + req_size) > MAX_ACTIONS_BUFSIZE) {
2472                         OVS_NLERR(log, "Flow action size exceeds max %u",
2473                                   MAX_ACTIONS_BUFSIZE);
2474                         return ERR_PTR(-EMSGSIZE);
2475                 }
2476                 new_acts_size = MAX_ACTIONS_BUFSIZE;
2477         }
2478
2479         acts = nla_alloc_flow_actions(new_acts_size);
2480         if (IS_ERR(acts))
2481                 return (void *)acts;
2482
2483         memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
2484         acts->actions_len = (*sfa)->actions_len;
2485         acts->orig_len = (*sfa)->orig_len;
2486         kfree(*sfa);
2487         *sfa = acts;
2488
2489 out:
2490         (*sfa)->actions_len += req_size;
2491         return  (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
2492 }
2493
2494 static struct nlattr *__add_action(struct sw_flow_actions **sfa,
2495                                    int attrtype, void *data, int len, bool log)
2496 {
2497         struct nlattr *a;
2498
2499         a = reserve_sfa_size(sfa, nla_attr_size(len), log);
2500         if (IS_ERR(a))
2501                 return a;
2502
2503         a->nla_type = attrtype;
2504         a->nla_len = nla_attr_size(len);
2505
2506         if (data)
2507                 memcpy(nla_data(a), data, len);
2508         memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
2509
2510         return a;
2511 }
2512
2513 int ovs_nla_add_action(struct sw_flow_actions **sfa, int attrtype, void *data,
2514                        int len, bool log)
2515 {
2516         struct nlattr *a;
2517
2518         a = __add_action(sfa, attrtype, data, len, log);
2519
2520         return PTR_ERR_OR_ZERO(a);
2521 }
2522
2523 static inline int add_nested_action_start(struct sw_flow_actions **sfa,
2524                                           int attrtype, bool log)
2525 {
2526         int used = (*sfa)->actions_len;
2527         int err;
2528
2529         err = ovs_nla_add_action(sfa, attrtype, NULL, 0, log);
2530         if (err)
2531                 return err;
2532
2533         return used;
2534 }
2535
2536 static inline void add_nested_action_end(struct sw_flow_actions *sfa,
2537                                          int st_offset)
2538 {
2539         struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions +
2540                                                                st_offset);
2541
2542         a->nla_len = sfa->actions_len - st_offset;
2543 }
2544
2545 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
2546                                   const struct sw_flow_key *key,
2547                                   struct sw_flow_actions **sfa,
2548                                   __be16 eth_type, __be16 vlan_tci,
2549                                   u32 mpls_label_count, bool log,
2550                                   u32 depth);
2551
2552 static int validate_and_copy_sample(struct net *net, const struct nlattr *attr,
2553                                     const struct sw_flow_key *key,
2554                                     struct sw_flow_actions **sfa,
2555                                     __be16 eth_type, __be16 vlan_tci,
2556                                     u32 mpls_label_count, bool log, bool last,
2557                                     u32 depth)
2558 {
2559         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
2560         const struct nlattr *probability, *actions;
2561         const struct nlattr *a;
2562         int rem, start, err;
2563         struct sample_arg arg;
2564
2565         memset(attrs, 0, sizeof(attrs));
2566         nla_for_each_nested(a, attr, rem) {
2567                 int type = nla_type(a);
2568                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
2569                         return -EINVAL;
2570                 attrs[type] = a;
2571         }
2572         if (rem)
2573                 return -EINVAL;
2574
2575         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
2576         if (!probability || nla_len(probability) != sizeof(u32))
2577                 return -EINVAL;
2578
2579         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
2580         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
2581                 return -EINVAL;
2582
2583         /* validation done, copy sample action. */
2584         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE, log);
2585         if (start < 0)
2586                 return start;
2587
2588         /* When both skb and flow may be changed, put the sample
2589          * into a deferred fifo. On the other hand, if only skb
2590          * may be modified, the actions can be executed in place.
2591          *
2592          * Do this analysis at the flow installation time.
2593          * Set 'clone_action->exec' to true if the actions can be
2594          * executed without being deferred.
2595          *
2596          * If the sample is the last action, it can always be excuted
2597          * rather than deferred.
2598          */
2599         arg.exec = last || !actions_may_change_flow(actions);
2600         arg.probability = nla_get_u32(probability);
2601
2602         err = ovs_nla_add_action(sfa, OVS_SAMPLE_ATTR_ARG, &arg, sizeof(arg),
2603                                  log);
2604         if (err)
2605                 return err;
2606
2607         err = __ovs_nla_copy_actions(net, actions, key, sfa,
2608                                      eth_type, vlan_tci, mpls_label_count, log,
2609                                      depth + 1);
2610
2611         if (err)
2612                 return err;
2613
2614         add_nested_action_end(*sfa, start);
2615
2616         return 0;
2617 }
2618
2619 static int validate_and_copy_dec_ttl(struct net *net,
2620                                      const struct nlattr *attr,
2621                                      const struct sw_flow_key *key,
2622                                      struct sw_flow_actions **sfa,
2623                                      __be16 eth_type, __be16 vlan_tci,
2624                                      u32 mpls_label_count, bool log,
2625                                      u32 depth)
2626 {
2627         const struct nlattr *attrs[OVS_DEC_TTL_ATTR_MAX + 1];
2628         int start, action_start, err, rem;
2629         const struct nlattr *a, *actions;
2630
2631         memset(attrs, 0, sizeof(attrs));
2632         nla_for_each_nested(a, attr, rem) {
2633                 int type = nla_type(a);
2634
2635                 /* Ignore unknown attributes to be future proof. */
2636                 if (type > OVS_DEC_TTL_ATTR_MAX)
2637                         continue;
2638
2639                 if (!type || attrs[type]) {
2640                         OVS_NLERR(log, "Duplicate or invalid key (type %d).",
2641                                   type);
2642                         return -EINVAL;
2643                 }
2644
2645                 attrs[type] = a;
2646         }
2647
2648         if (rem) {
2649                 OVS_NLERR(log, "Message has %d unknown bytes.", rem);
2650                 return -EINVAL;
2651         }
2652
2653         actions = attrs[OVS_DEC_TTL_ATTR_ACTION];
2654         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) {
2655                 OVS_NLERR(log, "Missing valid actions attribute.");
2656                 return -EINVAL;
2657         }
2658
2659         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_DEC_TTL, log);
2660         if (start < 0)
2661                 return start;
2662
2663         action_start = add_nested_action_start(sfa, OVS_DEC_TTL_ATTR_ACTION, log);
2664         if (action_start < 0)
2665                 return action_start;
2666
2667         err = __ovs_nla_copy_actions(net, actions, key, sfa, eth_type,
2668                                      vlan_tci, mpls_label_count, log,
2669                                      depth + 1);
2670         if (err)
2671                 return err;
2672
2673         add_nested_action_end(*sfa, action_start);
2674         add_nested_action_end(*sfa, start);
2675         return 0;
2676 }
2677
2678 static int validate_and_copy_clone(struct net *net,
2679                                    const struct nlattr *attr,
2680                                    const struct sw_flow_key *key,
2681                                    struct sw_flow_actions **sfa,
2682                                    __be16 eth_type, __be16 vlan_tci,
2683                                    u32 mpls_label_count, bool log, bool last,
2684                                    u32 depth)
2685 {
2686         int start, err;
2687         u32 exec;
2688
2689         if (nla_len(attr) && nla_len(attr) < NLA_HDRLEN)
2690                 return -EINVAL;
2691
2692         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_CLONE, log);
2693         if (start < 0)
2694                 return start;
2695
2696         exec = last || !actions_may_change_flow(attr);
2697
2698         err = ovs_nla_add_action(sfa, OVS_CLONE_ATTR_EXEC, &exec,
2699                                  sizeof(exec), log);
2700         if (err)
2701                 return err;
2702
2703         err = __ovs_nla_copy_actions(net, attr, key, sfa,
2704                                      eth_type, vlan_tci, mpls_label_count, log,
2705                                      depth + 1);
2706         if (err)
2707                 return err;
2708
2709         add_nested_action_end(*sfa, start);
2710
2711         return 0;
2712 }
2713
2714 void ovs_match_init(struct sw_flow_match *match,
2715                     struct sw_flow_key *key,
2716                     bool reset_key,
2717                     struct sw_flow_mask *mask)
2718 {
2719         memset(match, 0, sizeof(*match));
2720         match->key = key;
2721         match->mask = mask;
2722
2723         if (reset_key)
2724                 memset(key, 0, sizeof(*key));
2725
2726         if (mask) {
2727                 memset(&mask->key, 0, sizeof(mask->key));
2728                 mask->range.start = mask->range.end = 0;
2729         }
2730 }
2731
2732 static int validate_geneve_opts(struct sw_flow_key *key)
2733 {
2734         struct geneve_opt *option;
2735         int opts_len = key->tun_opts_len;
2736         bool crit_opt = false;
2737
2738         option = (struct geneve_opt *)TUN_METADATA_OPTS(key, key->tun_opts_len);
2739         while (opts_len > 0) {
2740                 int len;
2741
2742                 if (opts_len < sizeof(*option))
2743                         return -EINVAL;
2744
2745                 len = sizeof(*option) + option->length * 4;
2746                 if (len > opts_len)
2747                         return -EINVAL;
2748
2749                 crit_opt |= !!(option->type & GENEVE_CRIT_OPT_TYPE);
2750
2751                 option = (struct geneve_opt *)((u8 *)option + len);
2752                 opts_len -= len;
2753         }
2754
2755         key->tun_key.tun_flags |= crit_opt ? TUNNEL_CRIT_OPT : 0;
2756
2757         return 0;
2758 }
2759
2760 static int validate_and_copy_set_tun(const struct nlattr *attr,
2761                                      struct sw_flow_actions **sfa, bool log)
2762 {
2763         struct sw_flow_match match;
2764         struct sw_flow_key key;
2765         struct metadata_dst *tun_dst;
2766         struct ip_tunnel_info *tun_info;
2767         struct ovs_tunnel_info *ovs_tun;
2768         struct nlattr *a;
2769         int err = 0, start, opts_type;
2770         __be16 dst_opt_type;
2771
2772         dst_opt_type = 0;
2773         ovs_match_init(&match, &key, true, NULL);
2774         opts_type = ip_tun_from_nlattr(nla_data(attr), &match, false, log);
2775         if (opts_type < 0)
2776                 return opts_type;
2777
2778         if (key.tun_opts_len) {
2779                 switch (opts_type) {
2780                 case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS:
2781                         err = validate_geneve_opts(&key);
2782                         if (err < 0)
2783                                 return err;
2784                         dst_opt_type = TUNNEL_GENEVE_OPT;
2785                         break;
2786                 case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
2787                         dst_opt_type = TUNNEL_VXLAN_OPT;
2788                         break;
2789                 case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS:
2790                         dst_opt_type = TUNNEL_ERSPAN_OPT;
2791                         break;
2792                 }
2793         }
2794
2795         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET, log);
2796         if (start < 0)
2797                 return start;
2798
2799         tun_dst = metadata_dst_alloc(key.tun_opts_len, METADATA_IP_TUNNEL,
2800                                      GFP_KERNEL);
2801
2802         if (!tun_dst)
2803                 return -ENOMEM;
2804
2805         err = dst_cache_init(&tun_dst->u.tun_info.dst_cache, GFP_KERNEL);
2806         if (err) {
2807                 dst_release((struct dst_entry *)tun_dst);
2808                 return err;
2809         }
2810
2811         a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL,
2812                          sizeof(*ovs_tun), log);
2813         if (IS_ERR(a)) {
2814                 dst_release((struct dst_entry *)tun_dst);
2815                 return PTR_ERR(a);
2816         }
2817
2818         ovs_tun = nla_data(a);
2819         ovs_tun->tun_dst = tun_dst;
2820
2821         tun_info = &tun_dst->u.tun_info;
2822         tun_info->mode = IP_TUNNEL_INFO_TX;
2823         if (key.tun_proto == AF_INET6)
2824                 tun_info->mode |= IP_TUNNEL_INFO_IPV6;
2825         else if (key.tun_proto == AF_INET && key.tun_key.u.ipv4.dst == 0)
2826                 tun_info->mode |= IP_TUNNEL_INFO_BRIDGE;
2827         tun_info->key = key.tun_key;
2828
2829         /* We need to store the options in the action itself since
2830          * everything else will go away after flow setup. We can append
2831          * it to tun_info and then point there.
2832          */
2833         ip_tunnel_info_opts_set(tun_info,
2834                                 TUN_METADATA_OPTS(&key, key.tun_opts_len),
2835                                 key.tun_opts_len, dst_opt_type);
2836         add_nested_action_end(*sfa, start);
2837
2838         return err;
2839 }
2840
2841 static bool validate_nsh(const struct nlattr *attr, bool is_mask,
2842                          bool is_push_nsh, bool log)
2843 {
2844         struct sw_flow_match match;
2845         struct sw_flow_key key;
2846         int ret = 0;
2847
2848         ovs_match_init(&match, &key, true, NULL);
2849         ret = nsh_key_put_from_nlattr(attr, &match, is_mask,
2850                                       is_push_nsh, log);
2851         return !ret;
2852 }
2853
2854 /* Return false if there are any non-masked bits set.
2855  * Mask follows data immediately, before any netlink padding.
2856  */
2857 static bool validate_masked(u8 *data, int len)
2858 {
2859         u8 *mask = data + len;
2860
2861         while (len--)
2862                 if (*data++ & ~*mask++)
2863                         return false;
2864
2865         return true;
2866 }
2867
2868 static int validate_set(const struct nlattr *a,
2869                         const struct sw_flow_key *flow_key,
2870                         struct sw_flow_actions **sfa, bool *skip_copy,
2871                         u8 mac_proto, __be16 eth_type, bool masked, bool log)
2872 {
2873         const struct nlattr *ovs_key = nla_data(a);
2874         int key_type = nla_type(ovs_key);
2875         size_t key_len;
2876
2877         /* There can be only one key in a action */
2878         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
2879                 return -EINVAL;
2880
2881         key_len = nla_len(ovs_key);
2882         if (masked)
2883                 key_len /= 2;
2884
2885         if (key_type > OVS_KEY_ATTR_MAX ||
2886             !check_attr_len(key_len, ovs_key_lens[key_type].len))
2887                 return -EINVAL;
2888
2889         if (masked && !validate_masked(nla_data(ovs_key), key_len))
2890                 return -EINVAL;
2891
2892         switch (key_type) {
2893         case OVS_KEY_ATTR_PRIORITY:
2894         case OVS_KEY_ATTR_SKB_MARK:
2895         case OVS_KEY_ATTR_CT_MARK:
2896         case OVS_KEY_ATTR_CT_LABELS:
2897                 break;
2898
2899         case OVS_KEY_ATTR_ETHERNET:
2900                 if (mac_proto != MAC_PROTO_ETHERNET)
2901                         return -EINVAL;
2902                 break;
2903
2904         case OVS_KEY_ATTR_TUNNEL: {
2905                 int err;
2906
2907                 if (masked)
2908                         return -EINVAL; /* Masked tunnel set not supported. */
2909
2910                 *skip_copy = true;
2911                 err = validate_and_copy_set_tun(a, sfa, log);
2912                 if (err)
2913                         return err;
2914                 break;
2915         }
2916         case OVS_KEY_ATTR_IPV4: {
2917                 const struct ovs_key_ipv4 *ipv4_key;
2918
2919                 if (eth_type != htons(ETH_P_IP))
2920                         return -EINVAL;
2921
2922                 ipv4_key = nla_data(ovs_key);
2923
2924                 if (masked) {
2925                         const struct ovs_key_ipv4 *mask = ipv4_key + 1;
2926
2927                         /* Non-writeable fields. */
2928                         if (mask->ipv4_proto || mask->ipv4_frag)
2929                                 return -EINVAL;
2930                 } else {
2931                         if (ipv4_key->ipv4_proto != flow_key->ip.proto)
2932                                 return -EINVAL;
2933
2934                         if (ipv4_key->ipv4_frag != flow_key->ip.frag)
2935                                 return -EINVAL;
2936                 }
2937                 break;
2938         }
2939         case OVS_KEY_ATTR_IPV6: {
2940                 const struct ovs_key_ipv6 *ipv6_key;
2941
2942                 if (eth_type != htons(ETH_P_IPV6))
2943                         return -EINVAL;
2944
2945                 ipv6_key = nla_data(ovs_key);
2946
2947                 if (masked) {
2948                         const struct ovs_key_ipv6 *mask = ipv6_key + 1;
2949
2950                         /* Non-writeable fields. */
2951                         if (mask->ipv6_proto || mask->ipv6_frag)
2952                                 return -EINVAL;
2953
2954                         /* Invalid bits in the flow label mask? */
2955                         if (ntohl(mask->ipv6_label) & 0xFFF00000)
2956                                 return -EINVAL;
2957                 } else {
2958                         if (ipv6_key->ipv6_proto != flow_key->ip.proto)
2959                                 return -EINVAL;
2960
2961                         if (ipv6_key->ipv6_frag != flow_key->ip.frag)
2962                                 return -EINVAL;
2963                 }
2964                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
2965                         return -EINVAL;
2966
2967                 break;
2968         }
2969         case OVS_KEY_ATTR_TCP:
2970                 if ((eth_type != htons(ETH_P_IP) &&
2971                      eth_type != htons(ETH_P_IPV6)) ||
2972                     flow_key->ip.proto != IPPROTO_TCP)
2973                         return -EINVAL;
2974
2975                 break;
2976
2977         case OVS_KEY_ATTR_UDP:
2978                 if ((eth_type != htons(ETH_P_IP) &&
2979                      eth_type != htons(ETH_P_IPV6)) ||
2980                     flow_key->ip.proto != IPPROTO_UDP)
2981                         return -EINVAL;
2982
2983                 break;
2984
2985         case OVS_KEY_ATTR_MPLS:
2986                 if (!eth_p_mpls(eth_type))
2987                         return -EINVAL;
2988                 break;
2989
2990         case OVS_KEY_ATTR_SCTP:
2991                 if ((eth_type != htons(ETH_P_IP) &&
2992                      eth_type != htons(ETH_P_IPV6)) ||
2993                     flow_key->ip.proto != IPPROTO_SCTP)
2994                         return -EINVAL;
2995
2996                 break;
2997
2998         case OVS_KEY_ATTR_NSH:
2999                 if (eth_type != htons(ETH_P_NSH))
3000                         return -EINVAL;
3001                 if (!validate_nsh(nla_data(a), masked, false, log))
3002                         return -EINVAL;
3003                 break;
3004
3005         default:
3006                 return -EINVAL;
3007         }
3008
3009         /* Convert non-masked non-tunnel set actions to masked set actions. */
3010         if (!masked && key_type != OVS_KEY_ATTR_TUNNEL) {
3011                 int start, len = key_len * 2;
3012                 struct nlattr *at;
3013
3014                 *skip_copy = true;
3015
3016                 start = add_nested_action_start(sfa,
3017                                                 OVS_ACTION_ATTR_SET_TO_MASKED,
3018                                                 log);
3019                 if (start < 0)
3020                         return start;
3021
3022                 at = __add_action(sfa, key_type, NULL, len, log);
3023                 if (IS_ERR(at))
3024                         return PTR_ERR(at);
3025
3026                 memcpy(nla_data(at), nla_data(ovs_key), key_len); /* Key. */
3027                 memset(nla_data(at) + key_len, 0xff, key_len);    /* Mask. */
3028                 /* Clear non-writeable bits from otherwise writeable fields. */
3029                 if (key_type == OVS_KEY_ATTR_IPV6) {
3030                         struct ovs_key_ipv6 *mask = nla_data(at) + key_len;
3031
3032                         mask->ipv6_label &= htonl(0x000FFFFF);
3033                 }
3034                 add_nested_action_end(*sfa, start);
3035         }
3036
3037         return 0;
3038 }
3039
3040 static int validate_userspace(const struct nlattr *attr)
3041 {
3042         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
3043                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
3044                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
3045                 [OVS_USERSPACE_ATTR_EGRESS_TUN_PORT] = {.type = NLA_U32 },
3046         };
3047         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
3048         int error;
3049
3050         error = nla_parse_nested_deprecated(a, OVS_USERSPACE_ATTR_MAX, attr,
3051                                             userspace_policy, NULL);
3052         if (error)
3053                 return error;
3054
3055         if (!a[OVS_USERSPACE_ATTR_PID] ||
3056             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
3057                 return -EINVAL;
3058
3059         return 0;
3060 }
3061
3062 static const struct nla_policy cpl_policy[OVS_CHECK_PKT_LEN_ATTR_MAX + 1] = {
3063         [OVS_CHECK_PKT_LEN_ATTR_PKT_LEN] = {.type = NLA_U16 },
3064         [OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER] = {.type = NLA_NESTED },
3065         [OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL] = {.type = NLA_NESTED },
3066 };
3067
3068 static int validate_and_copy_check_pkt_len(struct net *net,
3069                                            const struct nlattr *attr,
3070                                            const struct sw_flow_key *key,
3071                                            struct sw_flow_actions **sfa,
3072                                            __be16 eth_type, __be16 vlan_tci,
3073                                            u32 mpls_label_count,
3074                                            bool log, bool last, u32 depth)
3075 {
3076         const struct nlattr *acts_if_greater, *acts_if_lesser_eq;
3077         struct nlattr *a[OVS_CHECK_PKT_LEN_ATTR_MAX + 1];
3078         struct check_pkt_len_arg arg;
3079         int nested_acts_start;
3080         int start, err;
3081
3082         err = nla_parse_deprecated_strict(a, OVS_CHECK_PKT_LEN_ATTR_MAX,
3083                                           nla_data(attr), nla_len(attr),
3084                                           cpl_policy, NULL);
3085         if (err)
3086                 return err;
3087
3088         if (!a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN] ||
3089             !nla_get_u16(a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN]))
3090                 return -EINVAL;
3091
3092         acts_if_lesser_eq = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL];
3093         acts_if_greater = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER];
3094
3095         /* Both the nested action should be present. */
3096         if (!acts_if_greater || !acts_if_lesser_eq)
3097                 return -EINVAL;
3098
3099         /* validation done, copy the nested actions. */
3100         start = add_nested_action_start(sfa, OVS_ACTION_ATTR_CHECK_PKT_LEN,
3101                                         log);
3102         if (start < 0)
3103                 return start;
3104
3105         arg.pkt_len = nla_get_u16(a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN]);
3106         arg.exec_for_lesser_equal =
3107                 last || !actions_may_change_flow(acts_if_lesser_eq);
3108         arg.exec_for_greater =
3109                 last || !actions_may_change_flow(acts_if_greater);
3110
3111         err = ovs_nla_add_action(sfa, OVS_CHECK_PKT_LEN_ATTR_ARG, &arg,
3112                                  sizeof(arg), log);
3113         if (err)
3114                 return err;
3115
3116         nested_acts_start = add_nested_action_start(sfa,
3117                 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL, log);
3118         if (nested_acts_start < 0)
3119                 return nested_acts_start;
3120
3121         err = __ovs_nla_copy_actions(net, acts_if_lesser_eq, key, sfa,
3122                                      eth_type, vlan_tci, mpls_label_count, log,
3123                                      depth + 1);
3124
3125         if (err)
3126                 return err;
3127
3128         add_nested_action_end(*sfa, nested_acts_start);
3129
3130         nested_acts_start = add_nested_action_start(sfa,
3131                 OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER, log);
3132         if (nested_acts_start < 0)
3133                 return nested_acts_start;
3134
3135         err = __ovs_nla_copy_actions(net, acts_if_greater, key, sfa,
3136                                      eth_type, vlan_tci, mpls_label_count, log,
3137                                      depth + 1);
3138
3139         if (err)
3140                 return err;
3141
3142         add_nested_action_end(*sfa, nested_acts_start);
3143         add_nested_action_end(*sfa, start);
3144         return 0;
3145 }
3146
3147 static int copy_action(const struct nlattr *from,
3148                        struct sw_flow_actions **sfa, bool log)
3149 {
3150         int totlen = NLA_ALIGN(from->nla_len);
3151         struct nlattr *to;
3152
3153         to = reserve_sfa_size(sfa, from->nla_len, log);
3154         if (IS_ERR(to))
3155                 return PTR_ERR(to);
3156
3157         memcpy(to, from, totlen);
3158         return 0;
3159 }
3160
3161 static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
3162                                   const struct sw_flow_key *key,
3163                                   struct sw_flow_actions **sfa,
3164                                   __be16 eth_type, __be16 vlan_tci,
3165                                   u32 mpls_label_count, bool log,
3166                                   u32 depth)
3167 {
3168         u8 mac_proto = ovs_key_mac_proto(key);
3169         const struct nlattr *a;
3170         int rem, err;
3171
3172         if (depth > OVS_COPY_ACTIONS_MAX_DEPTH)
3173                 return -EOVERFLOW;
3174
3175         nla_for_each_nested(a, attr, rem) {
3176                 /* Expected argument lengths, (u32)-1 for variable length. */
3177                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
3178                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
3179                         [OVS_ACTION_ATTR_RECIRC] = sizeof(u32),
3180                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
3181                         [OVS_ACTION_ATTR_PUSH_MPLS] = sizeof(struct ovs_action_push_mpls),
3182                         [OVS_ACTION_ATTR_POP_MPLS] = sizeof(__be16),
3183                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
3184                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
3185                         [OVS_ACTION_ATTR_SET] = (u32)-1,
3186                         [OVS_ACTION_ATTR_SET_MASKED] = (u32)-1,
3187                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
3188                         [OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash),
3189                         [OVS_ACTION_ATTR_CT] = (u32)-1,
3190                         [OVS_ACTION_ATTR_CT_CLEAR] = 0,
3191                         [OVS_ACTION_ATTR_TRUNC] = sizeof(struct ovs_action_trunc),
3192                         [OVS_ACTION_ATTR_PUSH_ETH] = sizeof(struct ovs_action_push_eth),
3193                         [OVS_ACTION_ATTR_POP_ETH] = 0,
3194                         [OVS_ACTION_ATTR_PUSH_NSH] = (u32)-1,
3195                         [OVS_ACTION_ATTR_POP_NSH] = 0,
3196                         [OVS_ACTION_ATTR_METER] = sizeof(u32),
3197                         [OVS_ACTION_ATTR_CLONE] = (u32)-1,
3198                         [OVS_ACTION_ATTR_CHECK_PKT_LEN] = (u32)-1,
3199                         [OVS_ACTION_ATTR_ADD_MPLS] = sizeof(struct ovs_action_add_mpls),
3200                         [OVS_ACTION_ATTR_DEC_TTL] = (u32)-1,
3201                         [OVS_ACTION_ATTR_DROP] = sizeof(u32),
3202                 };
3203                 const struct ovs_action_push_vlan *vlan;
3204                 int type = nla_type(a);
3205                 bool skip_copy;
3206
3207                 if (type > OVS_ACTION_ATTR_MAX ||
3208                     (action_lens[type] != nla_len(a) &&
3209                      action_lens[type] != (u32)-1))
3210                         return -EINVAL;
3211
3212                 skip_copy = false;
3213                 switch (type) {
3214                 case OVS_ACTION_ATTR_UNSPEC:
3215                         return -EINVAL;
3216
3217                 case OVS_ACTION_ATTR_USERSPACE:
3218                         err = validate_userspace(a);
3219                         if (err)
3220                                 return err;
3221                         break;
3222
3223                 case OVS_ACTION_ATTR_OUTPUT:
3224                         if (nla_get_u32(a) >= DP_MAX_PORTS)
3225                                 return -EINVAL;
3226                         break;
3227
3228                 case OVS_ACTION_ATTR_TRUNC: {
3229                         const struct ovs_action_trunc *trunc = nla_data(a);
3230
3231                         if (trunc->max_len < ETH_HLEN)
3232                                 return -EINVAL;
3233                         break;
3234                 }
3235
3236                 case OVS_ACTION_ATTR_HASH: {
3237                         const struct ovs_action_hash *act_hash = nla_data(a);
3238
3239                         switch (act_hash->hash_alg) {
3240                         case OVS_HASH_ALG_L4:
3241                                 fallthrough;
3242                         case OVS_HASH_ALG_SYM_L4:
3243                                 break;
3244                         default:
3245                                 return  -EINVAL;
3246                         }
3247
3248                         break;
3249                 }
3250
3251                 case OVS_ACTION_ATTR_POP_VLAN:
3252                         if (mac_proto != MAC_PROTO_ETHERNET)
3253                                 return -EINVAL;
3254                         vlan_tci = htons(0);
3255                         break;
3256
3257                 case OVS_ACTION_ATTR_PUSH_VLAN:
3258                         if (mac_proto != MAC_PROTO_ETHERNET)
3259                                 return -EINVAL;
3260                         vlan = nla_data(a);
3261                         if (!eth_type_vlan(vlan->vlan_tpid))
3262                                 return -EINVAL;
3263                         if (!(vlan->vlan_tci & htons(VLAN_CFI_MASK)))
3264                                 return -EINVAL;
3265                         vlan_tci = vlan->vlan_tci;
3266                         break;
3267
3268                 case OVS_ACTION_ATTR_RECIRC:
3269                         break;
3270
3271                 case OVS_ACTION_ATTR_ADD_MPLS: {
3272                         const struct ovs_action_add_mpls *mpls = nla_data(a);
3273
3274                         if (!eth_p_mpls(mpls->mpls_ethertype))
3275                                 return -EINVAL;
3276
3277                         if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK) {
3278                                 if (vlan_tci & htons(VLAN_CFI_MASK) ||
3279                                     (eth_type != htons(ETH_P_IP) &&
3280                                      eth_type != htons(ETH_P_IPV6) &&
3281                                      eth_type != htons(ETH_P_ARP) &&
3282                                      eth_type != htons(ETH_P_RARP) &&
3283                                      !eth_p_mpls(eth_type)))
3284                                         return -EINVAL;
3285                                 mpls_label_count++;
3286                         } else {
3287                                 if (mac_proto == MAC_PROTO_ETHERNET) {
3288                                         mpls_label_count = 1;
3289                                         mac_proto = MAC_PROTO_NONE;
3290                                 } else {
3291                                         mpls_label_count++;
3292                                 }
3293                         }
3294                         eth_type = mpls->mpls_ethertype;
3295                         break;
3296                 }
3297
3298                 case OVS_ACTION_ATTR_PUSH_MPLS: {
3299                         const struct ovs_action_push_mpls *mpls = nla_data(a);
3300
3301                         if (!eth_p_mpls(mpls->mpls_ethertype))
3302                                 return -EINVAL;
3303                         /* Prohibit push MPLS other than to a white list
3304                          * for packets that have a known tag order.
3305                          */
3306                         if (vlan_tci & htons(VLAN_CFI_MASK) ||
3307                             (eth_type != htons(ETH_P_IP) &&
3308                              eth_type != htons(ETH_P_IPV6) &&
3309                              eth_type != htons(ETH_P_ARP) &&
3310                              eth_type != htons(ETH_P_RARP) &&
3311                              !eth_p_mpls(eth_type)))
3312                                 return -EINVAL;
3313                         eth_type = mpls->mpls_ethertype;
3314                         mpls_label_count++;
3315                         break;
3316                 }
3317
3318                 case OVS_ACTION_ATTR_POP_MPLS: {
3319                         __be16  proto;
3320                         if (vlan_tci & htons(VLAN_CFI_MASK) ||
3321                             !eth_p_mpls(eth_type))
3322                                 return -EINVAL;
3323
3324                         /* Disallow subsequent L2.5+ set actions and mpls_pop
3325                          * actions once the last MPLS label in the packet is
3326                          * popped as there is no check here to ensure that
3327                          * the new eth type is valid and thus set actions could
3328                          * write off the end of the packet or otherwise corrupt
3329                          * it.
3330                          *
3331                          * Support for these actions is planned using packet
3332                          * recirculation.
3333                          */
3334                         proto = nla_get_be16(a);
3335
3336                         if (proto == htons(ETH_P_TEB) &&
3337                             mac_proto != MAC_PROTO_NONE)
3338                                 return -EINVAL;
3339
3340                         mpls_label_count--;
3341
3342                         if (!eth_p_mpls(proto) || !mpls_label_count)
3343                                 eth_type = htons(0);
3344                         else
3345                                 eth_type =  proto;
3346
3347                         break;
3348                 }
3349
3350                 case OVS_ACTION_ATTR_SET:
3351                         err = validate_set(a, key, sfa,
3352                                            &skip_copy, mac_proto, eth_type,
3353                                            false, log);
3354                         if (err)
3355                                 return err;
3356                         break;
3357
3358                 case OVS_ACTION_ATTR_SET_MASKED:
3359                         err = validate_set(a, key, sfa,
3360                                            &skip_copy, mac_proto, eth_type,
3361                                            true, log);
3362                         if (err)
3363                                 return err;
3364                         break;
3365
3366                 case OVS_ACTION_ATTR_SAMPLE: {
3367                         bool last = nla_is_last(a, rem);
3368
3369                         err = validate_and_copy_sample(net, a, key, sfa,
3370                                                        eth_type, vlan_tci,
3371                                                        mpls_label_count,
3372                                                        log, last, depth);
3373                         if (err)
3374                                 return err;
3375                         skip_copy = true;
3376                         break;
3377                 }
3378
3379                 case OVS_ACTION_ATTR_CT:
3380                         err = ovs_ct_copy_action(net, a, key, sfa, log);
3381                         if (err)
3382                                 return err;
3383                         skip_copy = true;
3384                         break;
3385
3386                 case OVS_ACTION_ATTR_CT_CLEAR:
3387                         break;
3388
3389                 case OVS_ACTION_ATTR_PUSH_ETH:
3390                         /* Disallow pushing an Ethernet header if one
3391                          * is already present */
3392                         if (mac_proto != MAC_PROTO_NONE)
3393                                 return -EINVAL;
3394                         mac_proto = MAC_PROTO_ETHERNET;
3395                         break;
3396
3397                 case OVS_ACTION_ATTR_POP_ETH:
3398                         if (mac_proto != MAC_PROTO_ETHERNET)
3399                                 return -EINVAL;
3400                         if (vlan_tci & htons(VLAN_CFI_MASK))
3401                                 return -EINVAL;
3402                         mac_proto = MAC_PROTO_NONE;
3403                         break;
3404
3405                 case OVS_ACTION_ATTR_PUSH_NSH:
3406                         if (mac_proto != MAC_PROTO_ETHERNET) {
3407                                 u8 next_proto;
3408
3409                                 next_proto = tun_p_from_eth_p(eth_type);
3410                                 if (!next_proto)
3411                                         return -EINVAL;
3412                         }
3413                         mac_proto = MAC_PROTO_NONE;
3414                         if (!validate_nsh(nla_data(a), false, true, true))
3415                                 return -EINVAL;
3416                         break;
3417
3418                 case OVS_ACTION_ATTR_POP_NSH: {
3419                         __be16 inner_proto;
3420
3421                         if (eth_type != htons(ETH_P_NSH))
3422                                 return -EINVAL;
3423                         inner_proto = tun_p_to_eth_p(key->nsh.base.np);
3424                         if (!inner_proto)
3425                                 return -EINVAL;
3426                         if (key->nsh.base.np == TUN_P_ETHERNET)
3427                                 mac_proto = MAC_PROTO_ETHERNET;
3428                         else
3429                                 mac_proto = MAC_PROTO_NONE;
3430                         break;
3431                 }
3432
3433                 case OVS_ACTION_ATTR_METER:
3434                         /* Non-existent meters are simply ignored.  */
3435                         break;
3436
3437                 case OVS_ACTION_ATTR_CLONE: {
3438                         bool last = nla_is_last(a, rem);
3439
3440                         err = validate_and_copy_clone(net, a, key, sfa,
3441                                                       eth_type, vlan_tci,
3442                                                       mpls_label_count,
3443                                                       log, last, depth);
3444                         if (err)
3445                                 return err;
3446                         skip_copy = true;
3447                         break;
3448                 }
3449
3450                 case OVS_ACTION_ATTR_CHECK_PKT_LEN: {
3451                         bool last = nla_is_last(a, rem);
3452
3453                         err = validate_and_copy_check_pkt_len(net, a, key, sfa,
3454                                                               eth_type,
3455                                                               vlan_tci,
3456                                                               mpls_label_count,
3457                                                               log, last,
3458                                                               depth);
3459                         if (err)
3460                                 return err;
3461                         skip_copy = true;
3462                         break;
3463                 }
3464
3465                 case OVS_ACTION_ATTR_DEC_TTL:
3466                         err = validate_and_copy_dec_ttl(net, a, key, sfa,
3467                                                         eth_type, vlan_tci,
3468                                                         mpls_label_count, log,
3469                                                         depth);
3470                         if (err)
3471                                 return err;
3472                         skip_copy = true;
3473                         break;
3474
3475                 case OVS_ACTION_ATTR_DROP:
3476                         if (!nla_is_last(a, rem))
3477                                 return -EINVAL;
3478                         break;
3479
3480                 default:
3481                         OVS_NLERR(log, "Unknown Action type %d", type);
3482                         return -EINVAL;
3483                 }
3484                 if (!skip_copy) {
3485                         err = copy_action(a, sfa, log);
3486                         if (err)
3487                                 return err;
3488                 }
3489         }
3490
3491         if (rem > 0)
3492                 return -EINVAL;
3493
3494         return 0;
3495 }
3496
3497 /* 'key' must be the masked key. */
3498 int ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
3499                          const struct sw_flow_key *key,
3500                          struct sw_flow_actions **sfa, bool log)
3501 {
3502         int err;
3503         u32 mpls_label_count = 0;
3504
3505         *sfa = nla_alloc_flow_actions(min(nla_len(attr), MAX_ACTIONS_BUFSIZE));
3506         if (IS_ERR(*sfa))
3507                 return PTR_ERR(*sfa);
3508
3509         if (eth_p_mpls(key->eth.type))
3510                 mpls_label_count = hweight_long(key->mpls.num_labels_mask);
3511
3512         (*sfa)->orig_len = nla_len(attr);
3513         err = __ovs_nla_copy_actions(net, attr, key, sfa, key->eth.type,
3514                                      key->eth.vlan.tci, mpls_label_count, log,
3515                                      0);
3516         if (err)
3517                 ovs_nla_free_flow_actions(*sfa);
3518
3519         return err;
3520 }
3521
3522 static int sample_action_to_attr(const struct nlattr *attr,
3523                                  struct sk_buff *skb)
3524 {
3525         struct nlattr *start, *ac_start = NULL, *sample_arg;
3526         int err = 0, rem = nla_len(attr);
3527         const struct sample_arg *arg;
3528         struct nlattr *actions;
3529
3530         start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SAMPLE);
3531         if (!start)
3532                 return -EMSGSIZE;
3533
3534         sample_arg = nla_data(attr);
3535         arg = nla_data(sample_arg);
3536         actions = nla_next(sample_arg, &rem);
3537
3538         if (nla_put_u32(skb, OVS_SAMPLE_ATTR_PROBABILITY, arg->probability)) {
3539                 err = -EMSGSIZE;
3540                 goto out;
3541         }
3542
3543         ac_start = nla_nest_start_noflag(skb, OVS_SAMPLE_ATTR_ACTIONS);
3544         if (!ac_start) {
3545                 err = -EMSGSIZE;
3546                 goto out;
3547         }
3548
3549         err = ovs_nla_put_actions(actions, rem, skb);
3550
3551 out:
3552         if (err) {
3553                 nla_nest_cancel(skb, ac_start);
3554                 nla_nest_cancel(skb, start);
3555         } else {
3556                 nla_nest_end(skb, ac_start);
3557                 nla_nest_end(skb, start);
3558         }
3559
3560         return err;
3561 }
3562
3563 static int clone_action_to_attr(const struct nlattr *attr,
3564                                 struct sk_buff *skb)
3565 {
3566         struct nlattr *start;
3567         int err = 0, rem = nla_len(attr);
3568
3569         start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CLONE);
3570         if (!start)
3571                 return -EMSGSIZE;
3572
3573         /* Skipping the OVS_CLONE_ATTR_EXEC that is always the first attribute. */
3574         attr = nla_next(nla_data(attr), &rem);
3575         err = ovs_nla_put_actions(attr, rem, skb);
3576
3577         if (err)
3578                 nla_nest_cancel(skb, start);
3579         else
3580                 nla_nest_end(skb, start);
3581
3582         return err;
3583 }
3584
3585 static int check_pkt_len_action_to_attr(const struct nlattr *attr,
3586                                         struct sk_buff *skb)
3587 {
3588         struct nlattr *start, *ac_start = NULL;
3589         const struct check_pkt_len_arg *arg;
3590         const struct nlattr *a, *cpl_arg;
3591         int err = 0, rem = nla_len(attr);
3592
3593         start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CHECK_PKT_LEN);
3594         if (!start)
3595                 return -EMSGSIZE;
3596
3597         /* The first nested attribute in 'attr' is always
3598          * 'OVS_CHECK_PKT_LEN_ATTR_ARG'.
3599          */
3600         cpl_arg = nla_data(attr);
3601         arg = nla_data(cpl_arg);
3602
3603         if (nla_put_u16(skb, OVS_CHECK_PKT_LEN_ATTR_PKT_LEN, arg->pkt_len)) {
3604                 err = -EMSGSIZE;
3605                 goto out;
3606         }
3607
3608         /* Second nested attribute in 'attr' is always
3609          * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'.
3610          */
3611         a = nla_next(cpl_arg, &rem);
3612         ac_start =  nla_nest_start_noflag(skb,
3613                                           OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL);
3614         if (!ac_start) {
3615                 err = -EMSGSIZE;
3616                 goto out;
3617         }
3618
3619         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
3620         if (err) {
3621                 nla_nest_cancel(skb, ac_start);
3622                 goto out;
3623         } else {
3624                 nla_nest_end(skb, ac_start);
3625         }
3626
3627         /* Third nested attribute in 'attr' is always
3628          * OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER.
3629          */
3630         a = nla_next(a, &rem);
3631         ac_start =  nla_nest_start_noflag(skb,
3632                                           OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER);
3633         if (!ac_start) {
3634                 err = -EMSGSIZE;
3635                 goto out;
3636         }
3637
3638         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
3639         if (err) {
3640                 nla_nest_cancel(skb, ac_start);
3641                 goto out;
3642         } else {
3643                 nla_nest_end(skb, ac_start);
3644         }
3645
3646         nla_nest_end(skb, start);
3647         return 0;
3648
3649 out:
3650         nla_nest_cancel(skb, start);
3651         return err;
3652 }
3653
3654 static int dec_ttl_action_to_attr(const struct nlattr *attr,
3655                                   struct sk_buff *skb)
3656 {
3657         struct nlattr *start, *action_start;
3658         const struct nlattr *a;
3659         int err = 0, rem;
3660
3661         start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_DEC_TTL);
3662         if (!start)
3663                 return -EMSGSIZE;
3664
3665         nla_for_each_attr(a, nla_data(attr), nla_len(attr), rem) {
3666                 switch (nla_type(a)) {
3667                 case OVS_DEC_TTL_ATTR_ACTION:
3668
3669                         action_start = nla_nest_start_noflag(skb, OVS_DEC_TTL_ATTR_ACTION);
3670                         if (!action_start) {
3671                                 err = -EMSGSIZE;
3672                                 goto out;
3673                         }
3674
3675                         err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
3676                         if (err)
3677                                 goto out;
3678
3679                         nla_nest_end(skb, action_start);
3680                         break;
3681
3682                 default:
3683                         /* Ignore all other option to be future compatible */
3684                         break;
3685                 }
3686         }
3687
3688         nla_nest_end(skb, start);
3689         return 0;
3690
3691 out:
3692         nla_nest_cancel(skb, start);
3693         return err;
3694 }
3695
3696 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
3697 {
3698         const struct nlattr *ovs_key = nla_data(a);
3699         int key_type = nla_type(ovs_key);
3700         struct nlattr *start;
3701         int err;
3702
3703         switch (key_type) {
3704         case OVS_KEY_ATTR_TUNNEL_INFO: {
3705                 struct ovs_tunnel_info *ovs_tun = nla_data(ovs_key);
3706                 struct ip_tunnel_info *tun_info = &ovs_tun->tun_dst->u.tun_info;
3707
3708                 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SET);
3709                 if (!start)
3710                         return -EMSGSIZE;
3711
3712                 err =  ip_tun_to_nlattr(skb, &tun_info->key,
3713                                         ip_tunnel_info_opts(tun_info),
3714                                         tun_info->options_len,
3715                                         ip_tunnel_info_af(tun_info), tun_info->mode);
3716                 if (err)
3717                         return err;
3718                 nla_nest_end(skb, start);
3719                 break;
3720         }
3721         default:
3722                 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
3723                         return -EMSGSIZE;
3724                 break;
3725         }
3726
3727         return 0;
3728 }
3729
3730 static int masked_set_action_to_set_action_attr(const struct nlattr *a,
3731                                                 struct sk_buff *skb)
3732 {
3733         const struct nlattr *ovs_key = nla_data(a);
3734         struct nlattr *nla;
3735         size_t key_len = nla_len(ovs_key) / 2;
3736
3737         /* Revert the conversion we did from a non-masked set action to
3738          * masked set action.
3739          */
3740         nla = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_SET);
3741         if (!nla)
3742                 return -EMSGSIZE;
3743
3744         if (nla_put(skb, nla_type(ovs_key), key_len, nla_data(ovs_key)))
3745                 return -EMSGSIZE;
3746
3747         nla_nest_end(skb, nla);
3748         return 0;
3749 }
3750
3751 int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
3752 {
3753         const struct nlattr *a;
3754         int rem, err;
3755
3756         nla_for_each_attr(a, attr, len, rem) {
3757                 int type = nla_type(a);
3758
3759                 switch (type) {
3760                 case OVS_ACTION_ATTR_SET:
3761                         err = set_action_to_attr(a, skb);
3762                         if (err)
3763                                 return err;
3764                         break;
3765
3766                 case OVS_ACTION_ATTR_SET_TO_MASKED:
3767                         err = masked_set_action_to_set_action_attr(a, skb);
3768                         if (err)
3769                                 return err;
3770                         break;
3771
3772                 case OVS_ACTION_ATTR_SAMPLE:
3773                         err = sample_action_to_attr(a, skb);
3774                         if (err)
3775                                 return err;
3776                         break;
3777
3778                 case OVS_ACTION_ATTR_CT:
3779                         err = ovs_ct_action_to_attr(nla_data(a), skb);
3780                         if (err)
3781                                 return err;
3782                         break;
3783
3784                 case OVS_ACTION_ATTR_CLONE:
3785                         err = clone_action_to_attr(a, skb);
3786                         if (err)
3787                                 return err;
3788                         break;
3789
3790                 case OVS_ACTION_ATTR_CHECK_PKT_LEN:
3791                         err = check_pkt_len_action_to_attr(a, skb);
3792                         if (err)
3793                                 return err;
3794                         break;
3795
3796                 case OVS_ACTION_ATTR_DEC_TTL:
3797                         err = dec_ttl_action_to_attr(a, skb);
3798                         if (err)
3799                                 return err;
3800                         break;
3801
3802                 default:
3803                         if (nla_put(skb, type, nla_len(a), nla_data(a)))
3804                                 return -EMSGSIZE;
3805                         break;
3806                 }
3807         }
3808
3809         return 0;
3810 }