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         enum nft_tunnel_mode    mode:8;
  19 };
  20
  21 static void nft_tunnel_get_eval(const struct nft_expr *expr,
  22                                 struct nft_regs *regs,
  23                                 const struct nft_pktinfo *pkt)
  24 {
  25         const struct nft_tunnel *priv = nft_expr_priv(expr);
  26         u32 *dest = &regs->data[priv->dreg];
  27         struct ip_tunnel_info *tun_info;
  28
  29         tun_info = skb_tunnel_info(pkt->skb);
  30
  31         switch (priv->key) {
  32         case NFT_TUNNEL_PATH:
  33                 if (!tun_info) {
  34                         nft_reg_store8(dest, false);
  35                         return;
  36                 }
  37                 if (priv->mode == NFT_TUNNEL_MODE_NONE ||
  38                     (priv->mode == NFT_TUNNEL_MODE_RX &&
  39                      !(tun_info->mode & IP_TUNNEL_INFO_TX)) ||
  40                     (priv->mode == NFT_TUNNEL_MODE_TX &&
  41                      (tun_info->mode & IP_TUNNEL_INFO_TX)))
  42                         nft_reg_store8(dest, true);
  43                 else
  44                         nft_reg_store8(dest, false);
  45                 break;
  46         case NFT_TUNNEL_ID:
  47                 if (!tun_info) {
  48                         regs->verdict.code = NFT_BREAK;
  49                         return;
  50                 }
  51                 if (priv->mode == NFT_TUNNEL_MODE_NONE ||
  52                     (priv->mode == NFT_TUNNEL_MODE_RX &&
  53                      !(tun_info->mode & IP_TUNNEL_INFO_TX)) ||
  54                     (priv->mode == NFT_TUNNEL_MODE_TX &&
  55                      (tun_info->mode & IP_TUNNEL_INFO_TX)))
  56                         *dest = ntohl(tunnel_id_to_key32(tun_info->key.tun_id));
  57                 else
  58                         regs->verdict.code = NFT_BREAK;
  59                 break;
  60         default:
  61                 WARN_ON(1);
  62                 regs->verdict.code = NFT_BREAK;
  63         }
  64 }
  65
  66 static const struct nla_policy nft_tunnel_policy[NFTA_TUNNEL_MAX + 1] = {
  67         [NFTA_TUNNEL_KEY]       = { .type = NLA_U32 },
  68         [NFTA_TUNNEL_DREG]      = { .type = NLA_U32 },
  69         [NFTA_TUNNEL_MODE]      = { .type = NLA_U32 },
  70 };
  71
  72 static int nft_tunnel_get_init(const struct nft_ctx *ctx,
  73                                const struct nft_expr *expr,
  74                                const struct nlattr * const tb[])
  75 {
  76         struct nft_tunnel *priv = nft_expr_priv(expr);
  77         u32 len;
  78
  79         if (!tb[NFTA_TUNNEL_KEY] &&
  80             !tb[NFTA_TUNNEL_DREG])
  81                 return -EINVAL;
  82
  83         priv->key = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY]));
  84         switch (priv->key) {
  85         case NFT_TUNNEL_PATH:
  86                 len = sizeof(u8);
  87                 break;
  88         case NFT_TUNNEL_ID:
  89                 len = sizeof(u32);
  90                 break;
  91         default:
  92                 return -EOPNOTSUPP;
  93         }
  94
  95         priv->dreg = nft_parse_register(tb[NFTA_TUNNEL_DREG]);
  96
  97         if (tb[NFTA_TUNNEL_MODE]) {
  98                 priv->mode = ntohl(nla_get_be32(tb[NFTA_TUNNEL_MODE]));
  99                 if (priv->mode > NFT_TUNNEL_MODE_MAX)
 100                         return -EOPNOTSUPP;
 101         } else {
 102                 priv->mode = NFT_TUNNEL_MODE_NONE;
 103         }
 104
 105         return nft_validate_register_store(ctx, priv->dreg, NULL,
 106                                            NFT_DATA_VALUE, len);
 107 }
 108
 109 static int nft_tunnel_get_dump(struct sk_buff *skb,
 110                                const struct nft_expr *expr)
 111 {
 112         const struct nft_tunnel *priv = nft_expr_priv(expr);
 113
 114         if (nla_put_be32(skb, NFTA_TUNNEL_KEY, htonl(priv->key)))
 115                 goto nla_put_failure;
 116         if (nft_dump_register(skb, NFTA_TUNNEL_DREG, priv->dreg))
 117                 goto nla_put_failure;
 118         if (nla_put_be32(skb, NFTA_TUNNEL_MODE, htonl(priv->mode)))
 119                 goto nla_put_failure;
 120         return 0;
 121
 122 nla_put_failure:
 123         return -1;
 124 }
 125
 126 static struct nft_expr_type nft_tunnel_type;
 127 static const struct nft_expr_ops nft_tunnel_get_ops = {
 128         .type           = &nft_tunnel_type,
 129         .size           = NFT_EXPR_SIZE(sizeof(struct nft_tunnel)),
 130         .eval           = nft_tunnel_get_eval,
 131         .init           = nft_tunnel_get_init,
 132         .dump           = nft_tunnel_get_dump,
 133 };
 134
 135 static struct nft_expr_type nft_tunnel_type __read_mostly = {
 136         .name           = "tunnel",
 137         .ops            = &nft_tunnel_get_ops,
 138         .policy         = nft_tunnel_policy,
 139         .maxattr        = NFTA_TUNNEL_MAX,
 140         .owner          = THIS_MODULE,
 141 };
 142
 143 struct nft_tunnel_opts {
 144         union {
 145                 struct vxlan_metadata   vxlan;
 146                 struct erspan_metadata  erspan;
 147         } u;
 148         u32     len;
 149         __be16  flags;
 150 };
 151
 152 struct nft_tunnel_obj {
 153         struct metadata_dst     *md;
 154         struct nft_tunnel_opts  opts;
 155 };
 156
 157 static const struct nla_policy nft_tunnel_ip_policy[NFTA_TUNNEL_KEY_IP_MAX + 1] = {
 158         [NFTA_TUNNEL_KEY_IP_SRC]        = { .type = NLA_U32 },
 159         [NFTA_TUNNEL_KEY_IP_DST]        = { .type = NLA_U32 },
 160 };
 161
 162 static int nft_tunnel_obj_ip_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_IP_MAX + 1];
 167         int err;
 168
 169         err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_IP_MAX, attr,
 170                                           nft_tunnel_ip_policy, NULL);
 171         if (err < 0)
 172                 return err;
 173
 174         if (!tb[NFTA_TUNNEL_KEY_IP_DST])
 175                 return -EINVAL;
 176
 177         if (tb[NFTA_TUNNEL_KEY_IP_SRC])
 178                 info->key.u.ipv4.src = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_SRC]);
 179         if (tb[NFTA_TUNNEL_KEY_IP_DST])
 180                 info->key.u.ipv4.dst = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_DST]);
 181
 182         return 0;
 183 }
 184
 185 static const struct nla_policy nft_tunnel_ip6_policy[NFTA_TUNNEL_KEY_IP6_MAX + 1] = {
 186         [NFTA_TUNNEL_KEY_IP6_SRC]       = { .len = sizeof(struct in6_addr), },
 187         [NFTA_TUNNEL_KEY_IP6_DST]       = { .len = sizeof(struct in6_addr), },
 188         [NFTA_TUNNEL_KEY_IP6_FLOWLABEL] = { .type = NLA_U32, }
 189 };
 190
 191 static int nft_tunnel_obj_ip6_init(const struct nft_ctx *ctx,
 192                                    const struct nlattr *attr,
 193                                    struct ip_tunnel_info *info)
 194 {
 195         struct nlattr *tb[NFTA_TUNNEL_KEY_IP6_MAX + 1];
 196         int err;
 197
 198         err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_IP6_MAX, attr,
 199                                           nft_tunnel_ip6_policy, NULL);
 200         if (err < 0)
 201                 return err;
 202
 203         if (!tb[NFTA_TUNNEL_KEY_IP6_DST])
 204                 return -EINVAL;
 205
 206         if (tb[NFTA_TUNNEL_KEY_IP6_SRC]) {
 207                 memcpy(&info->key.u.ipv6.src,
 208                        nla_data(tb[NFTA_TUNNEL_KEY_IP6_SRC]),
 209                        sizeof(struct in6_addr));
 210         }
 211         if (tb[NFTA_TUNNEL_KEY_IP6_DST]) {
 212                 memcpy(&info->key.u.ipv6.dst,
 213                        nla_data(tb[NFTA_TUNNEL_KEY_IP6_DST]),
 214                        sizeof(struct in6_addr));
 215         }
 216         if (tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL])
 217                 info->key.label = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL]);
 218
 219         info->mode |= IP_TUNNEL_INFO_IPV6;
 220
 221         return 0;
 222 }
 223
 224 static const struct nla_policy nft_tunnel_opts_vxlan_policy[NFTA_TUNNEL_KEY_VXLAN_MAX + 1] = {
 225         [NFTA_TUNNEL_KEY_VXLAN_GBP]     = { .type = NLA_U32 },
 226 };
 227
 228 static int nft_tunnel_obj_vxlan_init(const struct nlattr *attr,
 229                                      struct nft_tunnel_opts *opts)
 230 {
 231         struct nlattr *tb[NFTA_TUNNEL_KEY_VXLAN_MAX + 1];
 232         int err;
 233
 234         err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_VXLAN_MAX, attr,
 235                                           nft_tunnel_opts_vxlan_policy, NULL);
 236         if (err < 0)
 237                 return err;
 238
 239         if (!tb[NFTA_TUNNEL_KEY_VXLAN_GBP])
 240                 return -EINVAL;
 241
 242         opts->u.vxlan.gbp = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_VXLAN_GBP]));
 243
 244         opts->len       = sizeof(struct vxlan_metadata);
 245         opts->flags     = TUNNEL_VXLAN_OPT;
 246
 247         return 0;
 248 }
 249
 250 static const struct nla_policy nft_tunnel_opts_erspan_policy[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1] = {
 251         [NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]       = { .type = NLA_U32 },
 252         [NFTA_TUNNEL_KEY_ERSPAN_V2_DIR] = { .type = NLA_U8 },
 253         [NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]        = { .type = NLA_U8 },
 254 };
 255
 256 static int nft_tunnel_obj_erspan_init(const struct nlattr *attr,
 257                                       struct nft_tunnel_opts *opts)
 258 {
 259         struct nlattr *tb[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1];
 260         uint8_t hwid, dir;
 261         int err, version;
 262
 263         err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_ERSPAN_MAX,
 264                                           attr, nft_tunnel_opts_erspan_policy,
 265                                           NULL);
 266         if (err < 0)
 267                 return err;
 268
 269         version = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION]));
 270         switch (version) {
 271         case ERSPAN_VERSION:
 272                 if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX])
 273                         return -EINVAL;
 274
 275                 opts->u.erspan.u.index =
 276                         nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]);
 277                 break;
 278         case ERSPAN_VERSION2:
 279                 if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR] ||
 280                     !tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID])
 281                         return -EINVAL;
 282
 283                 hwid = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]);
 284                 dir = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR]);
 285
 286                 set_hwid(&opts->u.erspan.u.md2, hwid);
 287                 opts->u.erspan.u.md2.dir = dir;
 288                 break;
 289         default:
 290                 return -EOPNOTSUPP;
 291         }
 292         opts->u.erspan.version = version;
 293
 294         opts->len       = sizeof(struct erspan_metadata);
 295         opts->flags     = TUNNEL_ERSPAN_OPT;
 296
 297         return 0;
 298 }
 299
 300 static const struct nla_policy nft_tunnel_opts_policy[NFTA_TUNNEL_KEY_OPTS_MAX + 1] = {
 301         [NFTA_TUNNEL_KEY_OPTS_VXLAN]    = { .type = NLA_NESTED, },
 302         [NFTA_TUNNEL_KEY_OPTS_ERSPAN]   = { .type = NLA_NESTED, },
 303 };
 304
 305 static int nft_tunnel_obj_opts_init(const struct nft_ctx *ctx,
 306                                     const struct nlattr *attr,
 307                                     struct ip_tunnel_info *info,
 308                                     struct nft_tunnel_opts *opts)
 309 {
 310         struct nlattr *tb[NFTA_TUNNEL_KEY_OPTS_MAX + 1];
 311         int err;
 312
 313         err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_OPTS_MAX, attr,
 314                                           nft_tunnel_opts_policy, NULL);
 315         if (err < 0)
 316                 return err;
 317
 318         if (tb[NFTA_TUNNEL_KEY_OPTS_VXLAN]) {
 319                 err = nft_tunnel_obj_vxlan_init(tb[NFTA_TUNNEL_KEY_OPTS_VXLAN],
 320                                                 opts);
 321         } else if (tb[NFTA_TUNNEL_KEY_OPTS_ERSPAN]) {
 322                 err = nft_tunnel_obj_erspan_init(tb[NFTA_TUNNEL_KEY_OPTS_ERSPAN],
 323                                                  opts);
 324         } else {
 325                 return -EOPNOTSUPP;
 326         }
 327
 328         return err;
 329 }
 330
 331 static const struct nla_policy nft_tunnel_key_policy[NFTA_TUNNEL_KEY_MAX + 1] = {
 332         [NFTA_TUNNEL_KEY_IP]    = { .type = NLA_NESTED, },
 333         [NFTA_TUNNEL_KEY_IP6]   = { .type = NLA_NESTED, },
 334         [NFTA_TUNNEL_KEY_ID]    = { .type = NLA_U32, },
 335         [NFTA_TUNNEL_KEY_FLAGS] = { .type = NLA_U32, },
 336         [NFTA_TUNNEL_KEY_TOS]   = { .type = NLA_U8, },
 337         [NFTA_TUNNEL_KEY_TTL]   = { .type = NLA_U8, },
 338         [NFTA_TUNNEL_KEY_OPTS]  = { .type = NLA_NESTED, },
 339 };
 340
 341 static int nft_tunnel_obj_init(const struct nft_ctx *ctx,
 342                                const struct nlattr * const tb[],
 343                                struct nft_object *obj)
 344 {
 345         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 346         struct ip_tunnel_info info;
 347         struct metadata_dst *md;
 348         int err;
 349
 350         if (!tb[NFTA_TUNNEL_KEY_ID])
 351                 return -EINVAL;
 352
 353         memset(&info, 0, sizeof(info));
 354         info.mode               = IP_TUNNEL_INFO_TX;
 355         info.key.tun_id         = key32_to_tunnel_id(nla_get_be32(tb[NFTA_TUNNEL_KEY_ID]));
 356         info.key.tun_flags      = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
 357
 358         if (tb[NFTA_TUNNEL_KEY_IP]) {
 359                 err = nft_tunnel_obj_ip_init(ctx, tb[NFTA_TUNNEL_KEY_IP], &info);
 360                 if (err < 0)
 361                         return err;
 362         } else if (tb[NFTA_TUNNEL_KEY_IP6]) {
 363                 err = nft_tunnel_obj_ip6_init(ctx, tb[NFTA_TUNNEL_KEY_IP6], &info);
 364                 if (err < 0)
 365                         return err;
 366         } else {
 367                 return -EINVAL;
 368         }
 369
 370         if (tb[NFTA_TUNNEL_KEY_SPORT]) {
 371                 info.key.tp_src = nla_get_be16(tb[NFTA_TUNNEL_KEY_SPORT]);
 372         }
 373         if (tb[NFTA_TUNNEL_KEY_DPORT]) {
 374                 info.key.tp_dst = nla_get_be16(tb[NFTA_TUNNEL_KEY_DPORT]);
 375         }
 376
 377         if (tb[NFTA_TUNNEL_KEY_FLAGS]) {
 378                 u32 tun_flags;
 379
 380                 tun_flags = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_FLAGS]));
 381                 if (tun_flags & ~NFT_TUNNEL_F_MASK)
 382                         return -EOPNOTSUPP;
 383
 384                 if (tun_flags & NFT_TUNNEL_F_ZERO_CSUM_TX)
 385                         info.key.tun_flags &= ~TUNNEL_CSUM;
 386                 if (tun_flags & NFT_TUNNEL_F_DONT_FRAGMENT)
 387                         info.key.tun_flags |= TUNNEL_DONT_FRAGMENT;
 388                 if (tun_flags & NFT_TUNNEL_F_SEQ_NUMBER)
 389                         info.key.tun_flags |= TUNNEL_SEQ;
 390         }
 391         if (tb[NFTA_TUNNEL_KEY_TOS])
 392                 info.key.tos = nla_get_u8(tb[NFTA_TUNNEL_KEY_TOS]);
 393         if (tb[NFTA_TUNNEL_KEY_TTL])
 394                 info.key.ttl = nla_get_u8(tb[NFTA_TUNNEL_KEY_TTL]);
 395         else
 396                 info.key.ttl = U8_MAX;
 397
 398         if (tb[NFTA_TUNNEL_KEY_OPTS]) {
 399                 err = nft_tunnel_obj_opts_init(ctx, tb[NFTA_TUNNEL_KEY_OPTS],
 400                                                &info, &priv->opts);
 401                 if (err < 0)
 402                         return err;
 403         }
 404
 405         md = metadata_dst_alloc(priv->opts.len, METADATA_IP_TUNNEL, GFP_KERNEL);
 406         if (!md)
 407                 return -ENOMEM;
 408
 409         memcpy(&md->u.tun_info, &info, sizeof(info));
 410 #ifdef CONFIG_DST_CACHE
 411         err = dst_cache_init(&md->u.tun_info.dst_cache, GFP_KERNEL);
 412         if (err < 0) {
 413                 metadata_dst_free(md);
 414                 return err;
 415         }
 416 #endif
 417         ip_tunnel_info_opts_set(&md->u.tun_info, &priv->opts.u, priv->opts.len,
 418                                 priv->opts.flags);
 419         priv->md = md;
 420
 421         return 0;
 422 }
 423
 424 static inline void nft_tunnel_obj_eval(struct nft_object *obj,
 425                                        struct nft_regs *regs,
 426                                        const struct nft_pktinfo *pkt)
 427 {
 428         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 429         struct sk_buff *skb = pkt->skb;
 430
 431         skb_dst_drop(skb);
 432         dst_hold((struct dst_entry *) priv->md);
 433         skb_dst_set(skb, (struct dst_entry *) priv->md);
 434 }
 435
 436 static int nft_tunnel_ip_dump(struct sk_buff *skb, struct ip_tunnel_info *info)
 437 {
 438         struct nlattr *nest;
 439
 440         if (info->mode & IP_TUNNEL_INFO_IPV6) {
 441                 nest = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_IP6);
 442                 if (!nest)
 443                         return -1;
 444
 445                 if (nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_SRC, &info->key.u.ipv6.src) < 0 ||
 446                     nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_DST, &info->key.u.ipv6.dst) < 0 ||
 447                     nla_put_be32(skb, NFTA_TUNNEL_KEY_IP6_FLOWLABEL, info->key.label))
 448                         return -1;
 449
 450                 nla_nest_end(skb, nest);
 451         } else {
 452                 nest = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_IP);
 453                 if (!nest)
 454                         return -1;
 455
 456                 if (nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_SRC, info->key.u.ipv4.src) < 0 ||
 457                     nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_DST, info->key.u.ipv4.dst) < 0)
 458                         return -1;
 459
 460                 nla_nest_end(skb, nest);
 461         }
 462
 463         return 0;
 464 }
 465
 466 static int nft_tunnel_opts_dump(struct sk_buff *skb,
 467                                 struct nft_tunnel_obj *priv)
 468 {
 469         struct nft_tunnel_opts *opts = &priv->opts;
 470         struct nlattr *nest;
 471
 472         nest = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_OPTS);
 473         if (!nest)
 474                 return -1;
 475
 476         if (opts->flags & TUNNEL_VXLAN_OPT) {
 477                 if (nla_put_be32(skb, NFTA_TUNNEL_KEY_VXLAN_GBP,
 478                                  htonl(opts->u.vxlan.gbp)))
 479                         return -1;
 480         } else if (opts->flags & TUNNEL_ERSPAN_OPT) {
 481                 switch (opts->u.erspan.version) {
 482                 case ERSPAN_VERSION:
 483                         if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX,
 484                                          opts->u.erspan.u.index))
 485                                 return -1;
 486                         break;
 487                 case ERSPAN_VERSION2:
 488                         if (nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_HWID,
 489                                        get_hwid(&opts->u.erspan.u.md2)) ||
 490                             nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_DIR,
 491                                        opts->u.erspan.u.md2.dir))
 492                                 return -1;
 493                         break;
 494                 }
 495         }
 496         nla_nest_end(skb, nest);
 497
 498         return 0;
 499 }
 500
 501 static int nft_tunnel_ports_dump(struct sk_buff *skb,
 502                                  struct ip_tunnel_info *info)
 503 {
 504         if (nla_put_be16(skb, NFTA_TUNNEL_KEY_SPORT, htons(info->key.tp_src)) < 0 ||
 505             nla_put_be16(skb, NFTA_TUNNEL_KEY_DPORT, htons(info->key.tp_dst)) < 0)
 506                 return -1;
 507
 508         return 0;
 509 }
 510
 511 static int nft_tunnel_flags_dump(struct sk_buff *skb,
 512                                  struct ip_tunnel_info *info)
 513 {
 514         u32 flags = 0;
 515
 516         if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
 517                 flags |= NFT_TUNNEL_F_DONT_FRAGMENT;
 518         if (!(info->key.tun_flags & TUNNEL_CSUM))
 519                 flags |= NFT_TUNNEL_F_ZERO_CSUM_TX;
 520         if (info->key.tun_flags & TUNNEL_SEQ)
 521                 flags |= NFT_TUNNEL_F_SEQ_NUMBER;
 522
 523         if (nla_put_be32(skb, NFTA_TUNNEL_KEY_FLAGS, htonl(flags)) < 0)
 524                 return -1;
 525
 526         return 0;
 527 }
 528
 529 static int nft_tunnel_obj_dump(struct sk_buff *skb,
 530                                struct nft_object *obj, bool reset)
 531 {
 532         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 533         struct ip_tunnel_info *info = &priv->md->u.tun_info;
 534
 535         if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ID,
 536                          tunnel_id_to_key32(info->key.tun_id)) ||
 537             nft_tunnel_ip_dump(skb, info) < 0 ||
 538             nft_tunnel_ports_dump(skb, info) < 0 ||
 539             nft_tunnel_flags_dump(skb, info) < 0 ||
 540             nla_put_u8(skb, NFTA_TUNNEL_KEY_TOS, info->key.tos) ||
 541             nla_put_u8(skb, NFTA_TUNNEL_KEY_TTL, info->key.ttl) ||
 542             nft_tunnel_opts_dump(skb, priv) < 0)
 543                 goto nla_put_failure;
 544
 545         return 0;
 546
 547 nla_put_failure:
 548         return -1;
 549 }
 550
 551 static void nft_tunnel_obj_destroy(const struct nft_ctx *ctx,
 552                                    struct nft_object *obj)
 553 {
 554         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 555
 556         metadata_dst_free(priv->md);
 557 }
 558
 559 static struct nft_object_type nft_tunnel_obj_type;
 560 static const struct nft_object_ops nft_tunnel_obj_ops = {
 561         .type           = &nft_tunnel_obj_type,
 562         .size           = sizeof(struct nft_tunnel_obj),
 563         .eval           = nft_tunnel_obj_eval,
 564         .init           = nft_tunnel_obj_init,
 565         .destroy        = nft_tunnel_obj_destroy,
 566         .dump           = nft_tunnel_obj_dump,
 567 };
 568
 569 static struct nft_object_type nft_tunnel_obj_type __read_mostly = {
 570         .type           = NFT_OBJECT_TUNNEL,
 571         .ops            = &nft_tunnel_obj_ops,
 572         .maxattr        = NFTA_TUNNEL_KEY_MAX,
 573         .policy         = nft_tunnel_key_policy,
 574         .owner          = THIS_MODULE,
 575 };
 576
 577 static int __init nft_tunnel_module_init(void)
 578 {
 579         int err;
 580
 581         err = nft_register_expr(&nft_tunnel_type);
 582         if (err < 0)
 583                 return err;
 584
 585         err = nft_register_obj(&nft_tunnel_obj_type);
 586         if (err < 0)
 587                 nft_unregister_expr(&nft_tunnel_type);
 588
 589         return err;
 590 }
 591
 592 static void __exit nft_tunnel_module_exit(void)
 593 {
 594         nft_unregister_obj(&nft_tunnel_obj_type);
 595         nft_unregister_expr(&nft_tunnel_type);
 596 }
 597
 598 module_init(nft_tunnel_module_init);
 599 module_exit(nft_tunnel_module_exit);
 600
 601 MODULE_LICENSE("GPL");
 602 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
 603 MODULE_ALIAS_NFT_EXPR("tunnel");
 604 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_TUNNEL);