net/netfilter/nft_tunnel.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <linux/kernel.h>
   3 #include <linux/init.h>
   4 #include <linux/module.h>
   5 #include <linux/seqlock.h>
   6 #include <linux/netlink.h>
   7 #include <linux/netfilter.h>
   8 #include <linux/netfilter/nf_tables.h>
   9 #include <net/netfilter/nf_tables.h>
  10 #include <net/dst_metadata.h>
  11 #include <net/ip_tunnels.h>
  12 #include <net/vxlan.h>
  13 #include <net/erspan.h>
  14
  15 struct nft_tunnel {
  16         enum nft_tunnel_keys    key:8;
  17         enum nft_registers      dreg:8;
  18 };
  19
  20 static void nft_tunnel_get_eval(const struct nft_expr *expr,
  21                                 struct nft_regs *regs,
  22                                 const struct nft_pktinfo *pkt)
  23 {
  24         const struct nft_tunnel *priv = nft_expr_priv(expr);
  25         u32 *dest = &regs->data[priv->dreg];
  26         struct ip_tunnel_info *tun_info;
  27
  28         tun_info = skb_tunnel_info(pkt->skb);
  29
  30         switch (priv->key) {
  31         case NFT_TUNNEL_PATH:
  32                 nft_reg_store8(dest, !!tun_info);
  33                 break;
  34         case NFT_TUNNEL_ID:
  35                 if (!tun_info) {
  36                         regs->verdict.code = NFT_BREAK;
  37                         return;
  38                 }
  39                 *dest = ntohl(tunnel_id_to_key32(tun_info->key.tun_id));
  40                 break;
  41         default:
  42                 WARN_ON(1);
  43                 regs->verdict.code = NFT_BREAK;
  44         }
  45 }
  46
  47 static const struct nla_policy nft_tunnel_policy[NFTA_TUNNEL_MAX + 1] = {
  48         [NFTA_TUNNEL_KEY]       = { .type = NLA_U32 },
  49         [NFTA_TUNNEL_DREG]      = { .type = NLA_U32 },
  50 };
  51
  52 static int nft_tunnel_get_init(const struct nft_ctx *ctx,
  53                                const struct nft_expr *expr,
  54                                const struct nlattr * const tb[])
  55 {
  56         struct nft_tunnel *priv = nft_expr_priv(expr);
  57         u32 len;
  58
  59         if (!tb[NFTA_TUNNEL_KEY] ||
  60             !tb[NFTA_TUNNEL_DREG])
  61                 return -EINVAL;
  62
  63         priv->key = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY]));
  64         switch (priv->key) {
  65         case NFT_TUNNEL_PATH:
  66                 len = sizeof(u8);
  67                 break;
  68         case NFT_TUNNEL_ID:
  69                 len = sizeof(u32);
  70                 break;
  71         default:
  72                 return -EOPNOTSUPP;
  73         }
  74
  75         priv->dreg = nft_parse_register(tb[NFTA_TUNNEL_DREG]);
  76
  77         return nft_validate_register_store(ctx, priv->dreg, NULL,
  78                                            NFT_DATA_VALUE, len);
  79 }
  80
  81 static int nft_tunnel_get_dump(struct sk_buff *skb,
  82                                const struct nft_expr *expr)
  83 {
  84         const struct nft_tunnel *priv = nft_expr_priv(expr);
  85
  86         if (nla_put_be32(skb, NFTA_TUNNEL_KEY, htonl(priv->key)))
  87                 goto nla_put_failure;
  88         if (nft_dump_register(skb, NFTA_TUNNEL_DREG, priv->dreg))
  89                 goto nla_put_failure;
  90         return 0;
  91
  92 nla_put_failure:
  93         return -1;
  94 }
  95
  96 static struct nft_expr_type nft_tunnel_type;
  97 static const struct nft_expr_ops nft_tunnel_get_ops = {
  98         .type           = &nft_tunnel_type,
  99         .size           = NFT_EXPR_SIZE(sizeof(struct nft_tunnel)),
 100         .eval           = nft_tunnel_get_eval,
 101         .init           = nft_tunnel_get_init,
 102         .dump           = nft_tunnel_get_dump,
 103 };
 104
 105 static struct nft_expr_type nft_tunnel_type __read_mostly = {
 106         .name           = "tunnel",
 107         .family         = NFPROTO_NETDEV,
 108         .ops            = &nft_tunnel_get_ops,
 109         .policy         = nft_tunnel_policy,
 110         .maxattr        = NFTA_TUNNEL_MAX,
 111         .owner          = THIS_MODULE,
 112 };
 113
 114 struct nft_tunnel_opts {
 115         union {
 116                 struct vxlan_metadata   vxlan;
 117                 struct erspan_metadata  erspan;
 118         } u;
 119         u32     len;
 120         __be16  flags;
 121 };
 122
 123 struct nft_tunnel_obj {
 124         struct metadata_dst     *md;
 125         struct nft_tunnel_opts  opts;
 126 };
 127
 128 static const struct nla_policy nft_tunnel_ip_policy[NFTA_TUNNEL_KEY_IP_MAX + 1] = {
 129         [NFTA_TUNNEL_KEY_IP_SRC]        = { .type = NLA_U32 },
 130         [NFTA_TUNNEL_KEY_IP_DST]        = { .type = NLA_U32 },
 131 };
 132
 133 static int nft_tunnel_obj_ip_init(const struct nft_ctx *ctx,
 134                                   const struct nlattr *attr,
 135                                   struct ip_tunnel_info *info)
 136 {
 137         struct nlattr *tb[NFTA_TUNNEL_KEY_IP_MAX + 1];
 138         int err;
 139
 140         err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_IP_MAX, attr,
 141                                nft_tunnel_ip_policy, NULL);
 142         if (err < 0)
 143                 return err;
 144
 145         if (!tb[NFTA_TUNNEL_KEY_IP_DST])
 146                 return -EINVAL;
 147
 148         if (tb[NFTA_TUNNEL_KEY_IP_SRC])
 149                 info->key.u.ipv4.src = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_SRC]);
 150         if (tb[NFTA_TUNNEL_KEY_IP_DST])
 151                 info->key.u.ipv4.dst = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_DST]);
 152
 153         return 0;
 154 }
 155
 156 static const struct nla_policy nft_tunnel_ip6_policy[NFTA_TUNNEL_KEY_IP6_MAX + 1] = {
 157         [NFTA_TUNNEL_KEY_IP6_SRC]       = { .len = sizeof(struct in6_addr), },
 158         [NFTA_TUNNEL_KEY_IP6_DST]       = { .len = sizeof(struct in6_addr), },
 159         [NFTA_TUNNEL_KEY_IP6_FLOWLABEL] = { .type = NLA_U32, }
 160 };
 161
 162 static int nft_tunnel_obj_ip6_init(const struct nft_ctx *ctx,
 163                                    const struct nlattr *attr,
 164                                    struct ip_tunnel_info *info)
 165 {
 166         struct nlattr *tb[NFTA_TUNNEL_KEY_IP6_MAX + 1];
 167         int err;
 168
 169         err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_IP6_MAX, attr,
 170                                nft_tunnel_ip6_policy, NULL);
 171         if (err < 0)
 172                 return err;
 173
 174         if (!tb[NFTA_TUNNEL_KEY_IP6_DST])
 175                 return -EINVAL;
 176
 177         if (tb[NFTA_TUNNEL_KEY_IP6_SRC]) {
 178                 memcpy(&info->key.u.ipv6.src,
 179                        nla_data(tb[NFTA_TUNNEL_KEY_IP6_SRC]),
 180                        sizeof(struct in6_addr));
 181         }
 182         if (tb[NFTA_TUNNEL_KEY_IP6_DST]) {
 183                 memcpy(&info->key.u.ipv6.dst,
 184                        nla_data(tb[NFTA_TUNNEL_KEY_IP6_DST]),
 185                        sizeof(struct in6_addr));
 186         }
 187         if (tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL])
 188                 info->key.label = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL]);
 189
 190         info->mode |= IP_TUNNEL_INFO_IPV6;
 191
 192         return 0;
 193 }
 194
 195 static const struct nla_policy nft_tunnel_opts_vxlan_policy[NFTA_TUNNEL_KEY_VXLAN_MAX + 1] = {
 196         [NFTA_TUNNEL_KEY_VXLAN_GBP]     = { .type = NLA_U32 },
 197 };
 198
 199 static int nft_tunnel_obj_vxlan_init(const struct nlattr *attr,
 200                                      struct nft_tunnel_opts *opts)
 201 {
 202         struct nlattr *tb[NFTA_TUNNEL_KEY_VXLAN_MAX + 1];
 203         int err;
 204
 205         err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_VXLAN_MAX, attr,
 206                                nft_tunnel_opts_vxlan_policy, NULL);
 207         if (err < 0)
 208                 return err;
 209
 210         if (!tb[NFTA_TUNNEL_KEY_VXLAN_GBP])
 211                 return -EINVAL;
 212
 213         opts->u.vxlan.gbp = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_VXLAN_GBP]));
 214
 215         opts->len       = sizeof(struct vxlan_metadata);
 216         opts->flags     = TUNNEL_VXLAN_OPT;
 217
 218         return 0;
 219 }
 220
 221 static const struct nla_policy nft_tunnel_opts_erspan_policy[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1] = {
 222         [NFTA_TUNNEL_KEY_ERSPAN_VERSION]        = { .type = NLA_U32 },
 223         [NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]       = { .type = NLA_U32 },
 224         [NFTA_TUNNEL_KEY_ERSPAN_V2_DIR]         = { .type = NLA_U8 },
 225         [NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]        = { .type = NLA_U8 },
 226 };
 227
 228 static int nft_tunnel_obj_erspan_init(const struct nlattr *attr,
 229                                       struct nft_tunnel_opts *opts)
 230 {
 231         struct nlattr *tb[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1];
 232         uint8_t hwid, dir;
 233         int err, version;
 234
 235         err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_ERSPAN_MAX, attr,
 236                                nft_tunnel_opts_erspan_policy, NULL);
 237         if (err < 0)
 238                 return err;
 239
 240         if (!tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION])
 241                  return -EINVAL;
 242
 243         version = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION]));
 244         switch (version) {
 245         case ERSPAN_VERSION:
 246                 if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX])
 247                         return -EINVAL;
 248
 249                 opts->u.erspan.u.index =
 250                         nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]);
 251                 break;
 252         case ERSPAN_VERSION2:
 253                 if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR] ||
 254                     !tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID])
 255                         return -EINVAL;
 256
 257                 hwid = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]);
 258                 dir = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR]);
 259
 260                 set_hwid(&opts->u.erspan.u.md2, hwid);
 261                 opts->u.erspan.u.md2.dir = dir;
 262                 break;
 263         default:
 264                 return -EOPNOTSUPP;
 265         }
 266         opts->u.erspan.version = version;
 267
 268         opts->len       = sizeof(struct erspan_metadata);
 269         opts->flags     = TUNNEL_ERSPAN_OPT;
 270
 271         return 0;
 272 }
 273
 274 static const struct nla_policy nft_tunnel_opts_policy[NFTA_TUNNEL_KEY_OPTS_MAX + 1] = {
 275         [NFTA_TUNNEL_KEY_OPTS_VXLAN]    = { .type = NLA_NESTED, },
 276         [NFTA_TUNNEL_KEY_OPTS_ERSPAN]   = { .type = NLA_NESTED, },
 277 };
 278
 279 static int nft_tunnel_obj_opts_init(const struct nft_ctx *ctx,
 280                                     const struct nlattr *attr,
 281                                     struct ip_tunnel_info *info,
 282                                     struct nft_tunnel_opts *opts)
 283 {
 284         struct nlattr *tb[NFTA_TUNNEL_KEY_OPTS_MAX + 1];
 285         int err;
 286
 287         err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_OPTS_MAX, attr,
 288                                nft_tunnel_opts_policy, NULL);
 289         if (err < 0)
 290                 return err;
 291
 292         if (tb[NFTA_TUNNEL_KEY_OPTS_VXLAN]) {
 293                 err = nft_tunnel_obj_vxlan_init(tb[NFTA_TUNNEL_KEY_OPTS_VXLAN],
 294                                                 opts);
 295         } else if (tb[NFTA_TUNNEL_KEY_OPTS_ERSPAN]) {
 296                 err = nft_tunnel_obj_erspan_init(tb[NFTA_TUNNEL_KEY_OPTS_ERSPAN],
 297                                                  opts);
 298         } else {
 299                 return -EOPNOTSUPP;
 300         }
 301
 302         return err;
 303 }
 304
 305 static const struct nla_policy nft_tunnel_key_policy[NFTA_TUNNEL_KEY_MAX + 1] = {
 306         [NFTA_TUNNEL_KEY_IP]    = { .type = NLA_NESTED, },
 307         [NFTA_TUNNEL_KEY_IP6]   = { .type = NLA_NESTED, },
 308         [NFTA_TUNNEL_KEY_ID]    = { .type = NLA_U32, },
 309         [NFTA_TUNNEL_KEY_FLAGS] = { .type = NLA_U32, },
 310         [NFTA_TUNNEL_KEY_TOS]   = { .type = NLA_U8, },
 311         [NFTA_TUNNEL_KEY_TTL]   = { .type = NLA_U8, },
 312         [NFTA_TUNNEL_KEY_SPORT] = { .type = NLA_U16, },
 313         [NFTA_TUNNEL_KEY_DPORT] = { .type = NLA_U16, },
 314         [NFTA_TUNNEL_KEY_OPTS]  = { .type = NLA_NESTED, },
 315 };
 316
 317 static int nft_tunnel_obj_init(const struct nft_ctx *ctx,
 318                                const struct nlattr * const tb[],
 319                                struct nft_object *obj)
 320 {
 321         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 322         struct ip_tunnel_info info;
 323         struct metadata_dst *md;
 324         int err;
 325
 326         if (!tb[NFTA_TUNNEL_KEY_ID])
 327                 return -EINVAL;
 328
 329         memset(&info, 0, sizeof(info));
 330         info.mode               = IP_TUNNEL_INFO_TX;
 331         info.key.tun_id         = key32_to_tunnel_id(nla_get_be32(tb[NFTA_TUNNEL_KEY_ID]));
 332         info.key.tun_flags      = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
 333
 334         if (tb[NFTA_TUNNEL_KEY_IP]) {
 335                 err = nft_tunnel_obj_ip_init(ctx, tb[NFTA_TUNNEL_KEY_IP], &info);
 336                 if (err < 0)
 337                         return err;
 338         } else if (tb[NFTA_TUNNEL_KEY_IP6]) {
 339                 err = nft_tunnel_obj_ip6_init(ctx, tb[NFTA_TUNNEL_KEY_IP6], &info);
 340                 if (err < 0)
 341                         return err;
 342         } else {
 343                 return -EINVAL;
 344         }
 345
 346         if (tb[NFTA_TUNNEL_KEY_SPORT]) {
 347                 info.key.tp_src = nla_get_be16(tb[NFTA_TUNNEL_KEY_SPORT]);
 348         }
 349         if (tb[NFTA_TUNNEL_KEY_DPORT]) {
 350                 info.key.tp_dst = nla_get_be16(tb[NFTA_TUNNEL_KEY_DPORT]);
 351         }
 352
 353         if (tb[NFTA_TUNNEL_KEY_FLAGS]) {
 354                 u32 tun_flags;
 355
 356                 tun_flags = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_FLAGS]));
 357                 if (tun_flags & ~NFT_TUNNEL_F_MASK)
 358                         return -EOPNOTSUPP;
 359
 360                 if (tun_flags & NFT_TUNNEL_F_ZERO_CSUM_TX)
 361                         info.key.tun_flags &= ~TUNNEL_CSUM;
 362                 if (tun_flags & NFT_TUNNEL_F_DONT_FRAGMENT)
 363                         info.key.tun_flags |= TUNNEL_DONT_FRAGMENT;
 364                 if (tun_flags & NFT_TUNNEL_F_SEQ_NUMBER)
 365                         info.key.tun_flags |= TUNNEL_SEQ;
 366         }
 367         if (tb[NFTA_TUNNEL_KEY_TOS])
 368                 info.key.tos = nla_get_u8(tb[NFTA_TUNNEL_KEY_TOS]);
 369         if (tb[NFTA_TUNNEL_KEY_TTL])
 370                 info.key.ttl = nla_get_u8(tb[NFTA_TUNNEL_KEY_TTL]);
 371         else
 372                 info.key.ttl = U8_MAX;
 373
 374         if (tb[NFTA_TUNNEL_KEY_OPTS]) {
 375                 err = nft_tunnel_obj_opts_init(ctx, tb[NFTA_TUNNEL_KEY_OPTS],
 376                                                &info, &priv->opts);
 377                 if (err < 0)
 378                         return err;
 379         }
 380
 381         md = metadata_dst_alloc(priv->opts.len, METADATA_IP_TUNNEL, GFP_KERNEL);
 382         if (!md)
 383                 return -ENOMEM;
 384
 385         memcpy(&md->u.tun_info, &info, sizeof(info));
 386         ip_tunnel_info_opts_set(&md->u.tun_info, &priv->opts.u, priv->opts.len,
 387                                 priv->opts.flags);
 388         priv->md = md;
 389
 390         return 0;
 391 }
 392
 393 static inline void nft_tunnel_obj_eval(struct nft_object *obj,
 394                                        struct nft_regs *regs,
 395                                        const struct nft_pktinfo *pkt)
 396 {
 397         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 398         struct sk_buff *skb = pkt->skb;
 399
 400         skb_dst_drop(skb);
 401         dst_hold((struct dst_entry *) priv->md);
 402         skb_dst_set(skb, (struct dst_entry *) priv->md);
 403 }
 404
 405 static int nft_tunnel_ip_dump(struct sk_buff *skb, struct ip_tunnel_info *info)
 406 {
 407         struct nlattr *nest;
 408
 409         if (info->mode & IP_TUNNEL_INFO_IPV6) {
 410                 nest = nla_nest_start(skb, NFTA_TUNNEL_KEY_IP6);
 411                 if (!nest)
 412                         return -1;
 413
 414                 if (nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_SRC, &info->key.u.ipv6.src) < 0 ||
 415                     nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_DST, &info->key.u.ipv6.dst) < 0 ||
 416                     nla_put_be32(skb, NFTA_TUNNEL_KEY_IP6_FLOWLABEL, info->key.label))
 417                         return -1;
 418
 419                 nla_nest_end(skb, nest);
 420         } else {
 421                 nest = nla_nest_start(skb, NFTA_TUNNEL_KEY_IP);
 422                 if (!nest)
 423                         return -1;
 424
 425                 if (nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_SRC, info->key.u.ipv4.src) < 0 ||
 426                     nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_DST, info->key.u.ipv4.dst) < 0)
 427                         return -1;
 428
 429                 nla_nest_end(skb, nest);
 430         }
 431
 432         return 0;
 433 }
 434
 435 static int nft_tunnel_opts_dump(struct sk_buff *skb,
 436                                 struct nft_tunnel_obj *priv)
 437 {
 438         struct nft_tunnel_opts *opts = &priv->opts;
 439         struct nlattr *nest;
 440
 441         nest = nla_nest_start(skb, NFTA_TUNNEL_KEY_OPTS);
 442         if (!nest)
 443                 return -1;
 444
 445         if (opts->flags & TUNNEL_VXLAN_OPT) {
 446                 if (nla_put_be32(skb, NFTA_TUNNEL_KEY_VXLAN_GBP,
 447                                  htonl(opts->u.vxlan.gbp)))
 448                         return -1;
 449         } else if (opts->flags & TUNNEL_ERSPAN_OPT) {
 450                 switch (opts->u.erspan.version) {
 451                 case ERSPAN_VERSION:
 452                         if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX,
 453                                          opts->u.erspan.u.index))
 454                                 return -1;
 455                         break;
 456                 case ERSPAN_VERSION2:
 457                         if (nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_HWID,
 458                                        get_hwid(&opts->u.erspan.u.md2)) ||
 459                             nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_DIR,
 460                                        opts->u.erspan.u.md2.dir))
 461                                 return -1;
 462                         break;
 463                 }
 464         }
 465         nla_nest_end(skb, nest);
 466
 467         return 0;
 468 }
 469
 470 static int nft_tunnel_ports_dump(struct sk_buff *skb,
 471                                  struct ip_tunnel_info *info)
 472 {
 473         if (nla_put_be16(skb, NFTA_TUNNEL_KEY_SPORT, info->key.tp_src) < 0 ||
 474             nla_put_be16(skb, NFTA_TUNNEL_KEY_DPORT, info->key.tp_dst) < 0)
 475                 return -1;
 476
 477         return 0;
 478 }
 479
 480 static int nft_tunnel_flags_dump(struct sk_buff *skb,
 481                                  struct ip_tunnel_info *info)
 482 {
 483         u32 flags = 0;
 484
 485         if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
 486                 flags |= NFT_TUNNEL_F_DONT_FRAGMENT;
 487         if (!(info->key.tun_flags & TUNNEL_CSUM))
 488                 flags |= NFT_TUNNEL_F_ZERO_CSUM_TX;
 489         if (info->key.tun_flags & TUNNEL_SEQ)
 490                 flags |= NFT_TUNNEL_F_SEQ_NUMBER;
 491
 492         if (nla_put_be32(skb, NFTA_TUNNEL_KEY_FLAGS, htonl(flags)) < 0)
 493                 return -1;
 494
 495         return 0;
 496 }
 497
 498 static int nft_tunnel_obj_dump(struct sk_buff *skb,
 499                                struct nft_object *obj, bool reset)
 500 {
 501         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 502         struct ip_tunnel_info *info = &priv->md->u.tun_info;
 503
 504         if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ID,
 505                          tunnel_id_to_key32(info->key.tun_id)) ||
 506             nft_tunnel_ip_dump(skb, info) < 0 ||
 507             nft_tunnel_ports_dump(skb, info) < 0 ||
 508             nft_tunnel_flags_dump(skb, info) < 0 ||
 509             nla_put_u8(skb, NFTA_TUNNEL_KEY_TOS, info->key.tos) ||
 510             nla_put_u8(skb, NFTA_TUNNEL_KEY_TTL, info->key.ttl) ||
 511             nft_tunnel_opts_dump(skb, priv) < 0)
 512                 goto nla_put_failure;
 513
 514         return 0;
 515
 516 nla_put_failure:
 517         return -1;
 518 }
 519
 520 static void nft_tunnel_obj_destroy(const struct nft_ctx *ctx,
 521                                    struct nft_object *obj)
 522 {
 523         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 524
 525         metadata_dst_free(priv->md);
 526 }
 527
 528 static struct nft_object_type nft_tunnel_obj_type;
 529 static const struct nft_object_ops nft_tunnel_obj_ops = {
 530         .type           = &nft_tunnel_obj_type,
 531         .size           = sizeof(struct nft_tunnel_obj),
 532         .eval           = nft_tunnel_obj_eval,
 533         .init           = nft_tunnel_obj_init,
 534         .destroy        = nft_tunnel_obj_destroy,
 535         .dump           = nft_tunnel_obj_dump,
 536 };
 537
 538 static struct nft_object_type nft_tunnel_obj_type __read_mostly = {
 539         .type           = NFT_OBJECT_TUNNEL,
 540         .ops            = &nft_tunnel_obj_ops,
 541         .maxattr        = NFTA_TUNNEL_KEY_MAX,
 542         .policy         = nft_tunnel_key_policy,
 543         .owner          = THIS_MODULE,
 544 };
 545
 546 static int __init nft_tunnel_module_init(void)
 547 {
 548         int err;
 549
 550         err = nft_register_expr(&nft_tunnel_type);
 551         if (err < 0)
 552                 return err;
 553
 554         err = nft_register_obj(&nft_tunnel_obj_type);
 555         if (err < 0)
 556                 nft_unregister_expr(&nft_tunnel_type);
 557
 558         return err;
 559 }
 560
 561 static void __exit nft_tunnel_module_exit(void)
 562 {
 563         nft_unregister_obj(&nft_tunnel_obj_type);
 564         nft_unregister_expr(&nft_tunnel_type);
 565 }
 566
 567 module_init(nft_tunnel_module_init);
 568 module_exit(nft_tunnel_module_exit);
 569
 570 MODULE_LICENSE("GPL");
 571 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
 572 MODULE_ALIAS_NFT_EXPR("tunnel");
 573 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_TUNNEL);