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