net/openvswitch/flow_netlink.c

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