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