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 #include <net/geneve.h>
  15
  16 struct nft_tunnel {
  17         enum nft_tunnel_keys    key:8;
  18         u8                      dreg;
  19         enum nft_tunnel_mode    mode:8;
  20         u8                      len;
  21 };
  22
  23 static void nft_tunnel_get_eval(const struct nft_expr *expr,
  24                                 struct nft_regs *regs,
  25                                 const struct nft_pktinfo *pkt)
  26 {
  27         const struct nft_tunnel *priv = nft_expr_priv(expr);
  28         u32 *dest = &regs->data[priv->dreg];
  29         struct ip_tunnel_info *tun_info;
  30
  31         tun_info = skb_tunnel_info(pkt->skb);
  32
  33         switch (priv->key) {
  34         case NFT_TUNNEL_PATH:
  35                 if (!tun_info) {
  36                         nft_reg_store8(dest, false);
  37                         return;
  38                 }
  39                 if (priv->mode == NFT_TUNNEL_MODE_NONE ||
  40                     (priv->mode == NFT_TUNNEL_MODE_RX &&
  41                      !(tun_info->mode & IP_TUNNEL_INFO_TX)) ||
  42                     (priv->mode == NFT_TUNNEL_MODE_TX &&
  43                      (tun_info->mode & IP_TUNNEL_INFO_TX)))
  44                         nft_reg_store8(dest, true);
  45                 else
  46                         nft_reg_store8(dest, false);
  47                 break;
  48         case NFT_TUNNEL_ID:
  49                 if (!tun_info) {
  50                         regs->verdict.code = NFT_BREAK;
  51                         return;
  52                 }
  53                 if (priv->mode == NFT_TUNNEL_MODE_NONE ||
  54                     (priv->mode == NFT_TUNNEL_MODE_RX &&
  55                      !(tun_info->mode & IP_TUNNEL_INFO_TX)) ||
  56                     (priv->mode == NFT_TUNNEL_MODE_TX &&
  57                      (tun_info->mode & IP_TUNNEL_INFO_TX)))
  58                         *dest = ntohl(tunnel_id_to_key32(tun_info->key.tun_id));
  59                 else
  60                         regs->verdict.code = NFT_BREAK;
  61                 break;
  62         default:
  63                 WARN_ON(1);
  64                 regs->verdict.code = NFT_BREAK;
  65         }
  66 }
  67
  68 static const struct nla_policy nft_tunnel_policy[NFTA_TUNNEL_MAX + 1] = {
  69         [NFTA_TUNNEL_KEY]       = { .type = NLA_U32 },
  70         [NFTA_TUNNEL_DREG]      = { .type = NLA_U32 },
  71         [NFTA_TUNNEL_MODE]      = { .type = NLA_U32 },
  72 };
  73
  74 static int nft_tunnel_get_init(const struct nft_ctx *ctx,
  75                                const struct nft_expr *expr,
  76                                const struct nlattr * const tb[])
  77 {
  78         struct nft_tunnel *priv = nft_expr_priv(expr);
  79         u32 len;
  80
  81         if (!tb[NFTA_TUNNEL_KEY] ||
  82             !tb[NFTA_TUNNEL_DREG])
  83                 return -EINVAL;
  84
  85         priv->key = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY]));
  86         switch (priv->key) {
  87         case NFT_TUNNEL_PATH:
  88                 len = sizeof(u8);
  89                 break;
  90         case NFT_TUNNEL_ID:
  91                 len = sizeof(u32);
  92                 break;
  93         default:
  94                 return -EOPNOTSUPP;
  95         }
  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         priv->len = len;
 106         return nft_parse_register_store(ctx, tb[NFTA_TUNNEL_DREG], &priv->dreg,
 107                                         NULL, NFT_DATA_VALUE, len);
 108 }
 109
 110 static int nft_tunnel_get_dump(struct sk_buff *skb,
 111                                const struct nft_expr *expr)
 112 {
 113         const struct nft_tunnel *priv = nft_expr_priv(expr);
 114
 115         if (nla_put_be32(skb, NFTA_TUNNEL_KEY, htonl(priv->key)))
 116                 goto nla_put_failure;
 117         if (nft_dump_register(skb, NFTA_TUNNEL_DREG, priv->dreg))
 118                 goto nla_put_failure;
 119         if (nla_put_be32(skb, NFTA_TUNNEL_MODE, htonl(priv->mode)))
 120                 goto nla_put_failure;
 121         return 0;
 122
 123 nla_put_failure:
 124         return -1;
 125 }
 126
 127 static bool nft_tunnel_get_reduce(struct nft_regs_track *track,
 128                                   const struct nft_expr *expr)
 129 {
 130         const struct nft_tunnel *priv = nft_expr_priv(expr);
 131         const struct nft_tunnel *tunnel;
 132
 133         if (!nft_reg_track_cmp(track, expr, priv->dreg)) {
 134                 nft_reg_track_update(track, expr, priv->dreg, priv->len);
 135                 return false;
 136         }
 137
 138         tunnel = nft_expr_priv(track->regs[priv->dreg].selector);
 139         if (priv->key != tunnel->key ||
 140             priv->dreg != tunnel->dreg ||
 141             priv->mode != tunnel->mode) {
 142                 nft_reg_track_update(track, expr, priv->dreg, priv->len);
 143                 return false;
 144         }
 145
 146         if (!track->regs[priv->dreg].bitwise)
 147                 return true;
 148
 149         return false;
 150 }
 151
 152 static struct nft_expr_type nft_tunnel_type;
 153 static const struct nft_expr_ops nft_tunnel_get_ops = {
 154         .type           = &nft_tunnel_type,
 155         .size           = NFT_EXPR_SIZE(sizeof(struct nft_tunnel)),
 156         .eval           = nft_tunnel_get_eval,
 157         .init           = nft_tunnel_get_init,
 158         .dump           = nft_tunnel_get_dump,
 159         .reduce         = nft_tunnel_get_reduce,
 160 };
 161
 162 static struct nft_expr_type nft_tunnel_type __read_mostly = {
 163         .name           = "tunnel",
 164         .ops            = &nft_tunnel_get_ops,
 165         .policy         = nft_tunnel_policy,
 166         .maxattr        = NFTA_TUNNEL_MAX,
 167         .owner          = THIS_MODULE,
 168 };
 169
 170 struct nft_tunnel_opts {
 171         union {
 172                 struct vxlan_metadata   vxlan;
 173                 struct erspan_metadata  erspan;
 174                 u8      data[IP_TUNNEL_OPTS_MAX];
 175         } u;
 176         u32     len;
 177         __be16  flags;
 178 };
 179
 180 struct nft_tunnel_obj {
 181         struct metadata_dst     *md;
 182         struct nft_tunnel_opts  opts;
 183 };
 184
 185 static const struct nla_policy nft_tunnel_ip_policy[NFTA_TUNNEL_KEY_IP_MAX + 1] = {
 186         [NFTA_TUNNEL_KEY_IP_SRC]        = { .type = NLA_U32 },
 187         [NFTA_TUNNEL_KEY_IP_DST]        = { .type = NLA_U32 },
 188 };
 189
 190 static int nft_tunnel_obj_ip_init(const struct nft_ctx *ctx,
 191                                   const struct nlattr *attr,
 192                                   struct ip_tunnel_info *info)
 193 {
 194         struct nlattr *tb[NFTA_TUNNEL_KEY_IP_MAX + 1];
 195         int err;
 196
 197         err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_IP_MAX, attr,
 198                                           nft_tunnel_ip_policy, NULL);
 199         if (err < 0)
 200                 return err;
 201
 202         if (!tb[NFTA_TUNNEL_KEY_IP_DST])
 203                 return -EINVAL;
 204
 205         if (tb[NFTA_TUNNEL_KEY_IP_SRC])
 206                 info->key.u.ipv4.src = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_SRC]);
 207         if (tb[NFTA_TUNNEL_KEY_IP_DST])
 208                 info->key.u.ipv4.dst = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_DST]);
 209
 210         return 0;
 211 }
 212
 213 static const struct nla_policy nft_tunnel_ip6_policy[NFTA_TUNNEL_KEY_IP6_MAX + 1] = {
 214         [NFTA_TUNNEL_KEY_IP6_SRC]       = { .len = sizeof(struct in6_addr), },
 215         [NFTA_TUNNEL_KEY_IP6_DST]       = { .len = sizeof(struct in6_addr), },
 216         [NFTA_TUNNEL_KEY_IP6_FLOWLABEL] = { .type = NLA_U32, }
 217 };
 218
 219 static int nft_tunnel_obj_ip6_init(const struct nft_ctx *ctx,
 220                                    const struct nlattr *attr,
 221                                    struct ip_tunnel_info *info)
 222 {
 223         struct nlattr *tb[NFTA_TUNNEL_KEY_IP6_MAX + 1];
 224         int err;
 225
 226         err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_IP6_MAX, attr,
 227                                           nft_tunnel_ip6_policy, NULL);
 228         if (err < 0)
 229                 return err;
 230
 231         if (!tb[NFTA_TUNNEL_KEY_IP6_DST])
 232                 return -EINVAL;
 233
 234         if (tb[NFTA_TUNNEL_KEY_IP6_SRC]) {
 235                 memcpy(&info->key.u.ipv6.src,
 236                        nla_data(tb[NFTA_TUNNEL_KEY_IP6_SRC]),
 237                        sizeof(struct in6_addr));
 238         }
 239         if (tb[NFTA_TUNNEL_KEY_IP6_DST]) {
 240                 memcpy(&info->key.u.ipv6.dst,
 241                        nla_data(tb[NFTA_TUNNEL_KEY_IP6_DST]),
 242                        sizeof(struct in6_addr));
 243         }
 244         if (tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL])
 245                 info->key.label = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL]);
 246
 247         info->mode |= IP_TUNNEL_INFO_IPV6;
 248
 249         return 0;
 250 }
 251
 252 static const struct nla_policy nft_tunnel_opts_vxlan_policy[NFTA_TUNNEL_KEY_VXLAN_MAX + 1] = {
 253         [NFTA_TUNNEL_KEY_VXLAN_GBP]     = { .type = NLA_U32 },
 254 };
 255
 256 static int nft_tunnel_obj_vxlan_init(const struct nlattr *attr,
 257                                      struct nft_tunnel_opts *opts)
 258 {
 259         struct nlattr *tb[NFTA_TUNNEL_KEY_VXLAN_MAX + 1];
 260         int err;
 261
 262         err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_VXLAN_MAX, attr,
 263                                           nft_tunnel_opts_vxlan_policy, NULL);
 264         if (err < 0)
 265                 return err;
 266
 267         if (!tb[NFTA_TUNNEL_KEY_VXLAN_GBP])
 268                 return -EINVAL;
 269
 270         opts->u.vxlan.gbp = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_VXLAN_GBP]));
 271
 272         opts->len       = sizeof(struct vxlan_metadata);
 273         opts->flags     = TUNNEL_VXLAN_OPT;
 274
 275         return 0;
 276 }
 277
 278 static const struct nla_policy nft_tunnel_opts_erspan_policy[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1] = {
 279         [NFTA_TUNNEL_KEY_ERSPAN_VERSION]        = { .type = NLA_U32 },
 280         [NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]       = { .type = NLA_U32 },
 281         [NFTA_TUNNEL_KEY_ERSPAN_V2_DIR]         = { .type = NLA_U8 },
 282         [NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]        = { .type = NLA_U8 },
 283 };
 284
 285 static int nft_tunnel_obj_erspan_init(const struct nlattr *attr,
 286                                       struct nft_tunnel_opts *opts)
 287 {
 288         struct nlattr *tb[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1];
 289         uint8_t hwid, dir;
 290         int err, version;
 291
 292         err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_ERSPAN_MAX,
 293                                           attr, nft_tunnel_opts_erspan_policy,
 294                                           NULL);
 295         if (err < 0)
 296                 return err;
 297
 298         if (!tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION])
 299                  return -EINVAL;
 300
 301         version = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION]));
 302         switch (version) {
 303         case ERSPAN_VERSION:
 304                 if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX])
 305                         return -EINVAL;
 306
 307                 opts->u.erspan.u.index =
 308                         nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]);
 309                 break;
 310         case ERSPAN_VERSION2:
 311                 if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR] ||
 312                     !tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID])
 313                         return -EINVAL;
 314
 315                 hwid = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]);
 316                 dir = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR]);
 317
 318                 set_hwid(&opts->u.erspan.u.md2, hwid);
 319                 opts->u.erspan.u.md2.dir = dir;
 320                 break;
 321         default:
 322                 return -EOPNOTSUPP;
 323         }
 324         opts->u.erspan.version = version;
 325
 326         opts->len       = sizeof(struct erspan_metadata);
 327         opts->flags     = TUNNEL_ERSPAN_OPT;
 328
 329         return 0;
 330 }
 331
 332 static const struct nla_policy nft_tunnel_opts_geneve_policy[NFTA_TUNNEL_KEY_GENEVE_MAX + 1] = {
 333         [NFTA_TUNNEL_KEY_GENEVE_CLASS]  = { .type = NLA_U16 },
 334         [NFTA_TUNNEL_KEY_GENEVE_TYPE]   = { .type = NLA_U8 },
 335         [NFTA_TUNNEL_KEY_GENEVE_DATA]   = { .type = NLA_BINARY, .len = 128 },
 336 };
 337
 338 static int nft_tunnel_obj_geneve_init(const struct nlattr *attr,
 339                                       struct nft_tunnel_opts *opts)
 340 {
 341         struct geneve_opt *opt = (struct geneve_opt *)opts->u.data + opts->len;
 342         struct nlattr *tb[NFTA_TUNNEL_KEY_GENEVE_MAX + 1];
 343         int err, data_len;
 344
 345         err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_GENEVE_MAX, attr,
 346                                nft_tunnel_opts_geneve_policy, NULL);
 347         if (err < 0)
 348                 return err;
 349
 350         if (!tb[NFTA_TUNNEL_KEY_GENEVE_CLASS] ||
 351             !tb[NFTA_TUNNEL_KEY_GENEVE_TYPE] ||
 352             !tb[NFTA_TUNNEL_KEY_GENEVE_DATA])
 353                 return -EINVAL;
 354
 355         attr = tb[NFTA_TUNNEL_KEY_GENEVE_DATA];
 356         data_len = nla_len(attr);
 357         if (data_len % 4)
 358                 return -EINVAL;
 359
 360         opts->len += sizeof(*opt) + data_len;
 361         if (opts->len > IP_TUNNEL_OPTS_MAX)
 362                 return -EINVAL;
 363
 364         memcpy(opt->opt_data, nla_data(attr), data_len);
 365         opt->length = data_len / 4;
 366         opt->opt_class = nla_get_be16(tb[NFTA_TUNNEL_KEY_GENEVE_CLASS]);
 367         opt->type = nla_get_u8(tb[NFTA_TUNNEL_KEY_GENEVE_TYPE]);
 368         opts->flags = TUNNEL_GENEVE_OPT;
 369
 370         return 0;
 371 }
 372
 373 static const struct nla_policy nft_tunnel_opts_policy[NFTA_TUNNEL_KEY_OPTS_MAX + 1] = {
 374         [NFTA_TUNNEL_KEY_OPTS_UNSPEC]   = {
 375                 .strict_start_type = NFTA_TUNNEL_KEY_OPTS_GENEVE },
 376         [NFTA_TUNNEL_KEY_OPTS_VXLAN]    = { .type = NLA_NESTED, },
 377         [NFTA_TUNNEL_KEY_OPTS_ERSPAN]   = { .type = NLA_NESTED, },
 378         [NFTA_TUNNEL_KEY_OPTS_GENEVE]   = { .type = NLA_NESTED, },
 379 };
 380
 381 static int nft_tunnel_obj_opts_init(const struct nft_ctx *ctx,
 382                                     const struct nlattr *attr,
 383                                     struct ip_tunnel_info *info,
 384                                     struct nft_tunnel_opts *opts)
 385 {
 386         int err, rem, type = 0;
 387         struct nlattr *nla;
 388
 389         err = nla_validate_nested_deprecated(attr, NFTA_TUNNEL_KEY_OPTS_MAX,
 390                                              nft_tunnel_opts_policy, NULL);
 391         if (err < 0)
 392                 return err;
 393
 394         nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) {
 395                 switch (nla_type(nla)) {
 396                 case NFTA_TUNNEL_KEY_OPTS_VXLAN:
 397                         if (type)
 398                                 return -EINVAL;
 399                         err = nft_tunnel_obj_vxlan_init(nla, opts);
 400                         if (err)
 401                                 return err;
 402                         type = TUNNEL_VXLAN_OPT;
 403                         break;
 404                 case NFTA_TUNNEL_KEY_OPTS_ERSPAN:
 405                         if (type)
 406                                 return -EINVAL;
 407                         err = nft_tunnel_obj_erspan_init(nla, opts);
 408                         if (err)
 409                                 return err;
 410                         type = TUNNEL_ERSPAN_OPT;
 411                         break;
 412                 case NFTA_TUNNEL_KEY_OPTS_GENEVE:
 413                         if (type && type != TUNNEL_GENEVE_OPT)
 414                                 return -EINVAL;
 415                         err = nft_tunnel_obj_geneve_init(nla, opts);
 416                         if (err)
 417                                 return err;
 418                         type = TUNNEL_GENEVE_OPT;
 419                         break;
 420                 default:
 421                         return -EOPNOTSUPP;
 422                 }
 423         }
 424
 425         return err;
 426 }
 427
 428 static const struct nla_policy nft_tunnel_key_policy[NFTA_TUNNEL_KEY_MAX + 1] = {
 429         [NFTA_TUNNEL_KEY_IP]    = { .type = NLA_NESTED, },
 430         [NFTA_TUNNEL_KEY_IP6]   = { .type = NLA_NESTED, },
 431         [NFTA_TUNNEL_KEY_ID]    = { .type = NLA_U32, },
 432         [NFTA_TUNNEL_KEY_FLAGS] = { .type = NLA_U32, },
 433         [NFTA_TUNNEL_KEY_TOS]   = { .type = NLA_U8, },
 434         [NFTA_TUNNEL_KEY_TTL]   = { .type = NLA_U8, },
 435         [NFTA_TUNNEL_KEY_SPORT] = { .type = NLA_U16, },
 436         [NFTA_TUNNEL_KEY_DPORT] = { .type = NLA_U16, },
 437         [NFTA_TUNNEL_KEY_OPTS]  = { .type = NLA_NESTED, },
 438 };
 439
 440 static int nft_tunnel_obj_init(const struct nft_ctx *ctx,
 441                                const struct nlattr * const tb[],
 442                                struct nft_object *obj)
 443 {
 444         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 445         struct ip_tunnel_info info;
 446         struct metadata_dst *md;
 447         int err;
 448
 449         if (!tb[NFTA_TUNNEL_KEY_ID])
 450                 return -EINVAL;
 451
 452         memset(&info, 0, sizeof(info));
 453         info.mode               = IP_TUNNEL_INFO_TX;
 454         info.key.tun_id         = key32_to_tunnel_id(nla_get_be32(tb[NFTA_TUNNEL_KEY_ID]));
 455         info.key.tun_flags      = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
 456
 457         if (tb[NFTA_TUNNEL_KEY_IP]) {
 458                 err = nft_tunnel_obj_ip_init(ctx, tb[NFTA_TUNNEL_KEY_IP], &info);
 459                 if (err < 0)
 460                         return err;
 461         } else if (tb[NFTA_TUNNEL_KEY_IP6]) {
 462                 err = nft_tunnel_obj_ip6_init(ctx, tb[NFTA_TUNNEL_KEY_IP6], &info);
 463                 if (err < 0)
 464                         return err;
 465         } else {
 466                 return -EINVAL;
 467         }
 468
 469         if (tb[NFTA_TUNNEL_KEY_SPORT]) {
 470                 info.key.tp_src = nla_get_be16(tb[NFTA_TUNNEL_KEY_SPORT]);
 471         }
 472         if (tb[NFTA_TUNNEL_KEY_DPORT]) {
 473                 info.key.tp_dst = nla_get_be16(tb[NFTA_TUNNEL_KEY_DPORT]);
 474         }
 475
 476         if (tb[NFTA_TUNNEL_KEY_FLAGS]) {
 477                 u32 tun_flags;
 478
 479                 tun_flags = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_FLAGS]));
 480                 if (tun_flags & ~NFT_TUNNEL_F_MASK)
 481                         return -EOPNOTSUPP;
 482
 483                 if (tun_flags & NFT_TUNNEL_F_ZERO_CSUM_TX)
 484                         info.key.tun_flags &= ~TUNNEL_CSUM;
 485                 if (tun_flags & NFT_TUNNEL_F_DONT_FRAGMENT)
 486                         info.key.tun_flags |= TUNNEL_DONT_FRAGMENT;
 487                 if (tun_flags & NFT_TUNNEL_F_SEQ_NUMBER)
 488                         info.key.tun_flags |= TUNNEL_SEQ;
 489         }
 490         if (tb[NFTA_TUNNEL_KEY_TOS])
 491                 info.key.tos = nla_get_u8(tb[NFTA_TUNNEL_KEY_TOS]);
 492         if (tb[NFTA_TUNNEL_KEY_TTL])
 493                 info.key.ttl = nla_get_u8(tb[NFTA_TUNNEL_KEY_TTL]);
 494         else
 495                 info.key.ttl = U8_MAX;
 496
 497         if (tb[NFTA_TUNNEL_KEY_OPTS]) {
 498                 err = nft_tunnel_obj_opts_init(ctx, tb[NFTA_TUNNEL_KEY_OPTS],
 499                                                &info, &priv->opts);
 500                 if (err < 0)
 501                         return err;
 502         }
 503
 504         md = metadata_dst_alloc(priv->opts.len, METADATA_IP_TUNNEL, GFP_KERNEL);
 505         if (!md)
 506                 return -ENOMEM;
 507
 508         memcpy(&md->u.tun_info, &info, sizeof(info));
 509 #ifdef CONFIG_DST_CACHE
 510         err = dst_cache_init(&md->u.tun_info.dst_cache, GFP_KERNEL);
 511         if (err < 0) {
 512                 metadata_dst_free(md);
 513                 return err;
 514         }
 515 #endif
 516         ip_tunnel_info_opts_set(&md->u.tun_info, &priv->opts.u, priv->opts.len,
 517                                 priv->opts.flags);
 518         priv->md = md;
 519
 520         return 0;
 521 }
 522
 523 static inline void nft_tunnel_obj_eval(struct nft_object *obj,
 524                                        struct nft_regs *regs,
 525                                        const struct nft_pktinfo *pkt)
 526 {
 527         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 528         struct sk_buff *skb = pkt->skb;
 529
 530         skb_dst_drop(skb);
 531         dst_hold((struct dst_entry *) priv->md);
 532         skb_dst_set(skb, (struct dst_entry *) priv->md);
 533 }
 534
 535 static int nft_tunnel_ip_dump(struct sk_buff *skb, struct ip_tunnel_info *info)
 536 {
 537         struct nlattr *nest;
 538
 539         if (info->mode & IP_TUNNEL_INFO_IPV6) {
 540                 nest = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_IP6);
 541                 if (!nest)
 542                         return -1;
 543
 544                 if (nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_SRC,
 545                                      &info->key.u.ipv6.src) < 0 ||
 546                     nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_DST,
 547                                      &info->key.u.ipv6.dst) < 0 ||
 548                     nla_put_be32(skb, NFTA_TUNNEL_KEY_IP6_FLOWLABEL,
 549                                  info->key.label)) {
 550                         nla_nest_cancel(skb, nest);
 551                         return -1;
 552                 }
 553
 554                 nla_nest_end(skb, nest);
 555         } else {
 556                 nest = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_IP);
 557                 if (!nest)
 558                         return -1;
 559
 560                 if (nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_SRC,
 561                                     info->key.u.ipv4.src) < 0 ||
 562                     nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_DST,
 563                                     info->key.u.ipv4.dst) < 0) {
 564                         nla_nest_cancel(skb, nest);
 565                         return -1;
 566                 }
 567
 568                 nla_nest_end(skb, nest);
 569         }
 570
 571         return 0;
 572 }
 573
 574 static int nft_tunnel_opts_dump(struct sk_buff *skb,
 575                                 struct nft_tunnel_obj *priv)
 576 {
 577         struct nft_tunnel_opts *opts = &priv->opts;
 578         struct nlattr *nest, *inner;
 579
 580         nest = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_OPTS);
 581         if (!nest)
 582                 return -1;
 583
 584         if (opts->flags & TUNNEL_VXLAN_OPT) {
 585                 inner = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_OPTS_VXLAN);
 586                 if (!inner)
 587                         goto failure;
 588                 if (nla_put_be32(skb, NFTA_TUNNEL_KEY_VXLAN_GBP,
 589                                  htonl(opts->u.vxlan.gbp)))
 590                         goto inner_failure;
 591                 nla_nest_end(skb, inner);
 592         } else if (opts->flags & TUNNEL_ERSPAN_OPT) {
 593                 inner = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_OPTS_ERSPAN);
 594                 if (!inner)
 595                         goto failure;
 596                 if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ERSPAN_VERSION,
 597                                  htonl(opts->u.erspan.version)))
 598                         goto inner_failure;
 599                 switch (opts->u.erspan.version) {
 600                 case ERSPAN_VERSION:
 601                         if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX,
 602                                          opts->u.erspan.u.index))
 603                                 goto inner_failure;
 604                         break;
 605                 case ERSPAN_VERSION2:
 606                         if (nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_HWID,
 607                                        get_hwid(&opts->u.erspan.u.md2)) ||
 608                             nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_DIR,
 609                                        opts->u.erspan.u.md2.dir))
 610                                 goto inner_failure;
 611                         break;
 612                 }
 613                 nla_nest_end(skb, inner);
 614         } else if (opts->flags & TUNNEL_GENEVE_OPT) {
 615                 struct geneve_opt *opt;
 616                 int offset = 0;
 617
 618                 inner = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_OPTS_GENEVE);
 619                 if (!inner)
 620                         goto failure;
 621                 while (opts->len > offset) {
 622                         opt = (struct geneve_opt *)opts->u.data + offset;
 623                         if (nla_put_be16(skb, NFTA_TUNNEL_KEY_GENEVE_CLASS,
 624                                          opt->opt_class) ||
 625                             nla_put_u8(skb, NFTA_TUNNEL_KEY_GENEVE_TYPE,
 626                                        opt->type) ||
 627                             nla_put(skb, NFTA_TUNNEL_KEY_GENEVE_DATA,
 628                                     opt->length * 4, opt->opt_data))
 629                                 goto inner_failure;
 630                         offset += sizeof(*opt) + opt->length * 4;
 631                 }
 632                 nla_nest_end(skb, inner);
 633         }
 634         nla_nest_end(skb, nest);
 635         return 0;
 636
 637 inner_failure:
 638         nla_nest_cancel(skb, inner);
 639 failure:
 640         nla_nest_cancel(skb, nest);
 641         return -1;
 642 }
 643
 644 static int nft_tunnel_ports_dump(struct sk_buff *skb,
 645                                  struct ip_tunnel_info *info)
 646 {
 647         if (nla_put_be16(skb, NFTA_TUNNEL_KEY_SPORT, info->key.tp_src) < 0 ||
 648             nla_put_be16(skb, NFTA_TUNNEL_KEY_DPORT, info->key.tp_dst) < 0)
 649                 return -1;
 650
 651         return 0;
 652 }
 653
 654 static int nft_tunnel_flags_dump(struct sk_buff *skb,
 655                                  struct ip_tunnel_info *info)
 656 {
 657         u32 flags = 0;
 658
 659         if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
 660                 flags |= NFT_TUNNEL_F_DONT_FRAGMENT;
 661         if (!(info->key.tun_flags & TUNNEL_CSUM))
 662                 flags |= NFT_TUNNEL_F_ZERO_CSUM_TX;
 663         if (info->key.tun_flags & TUNNEL_SEQ)
 664                 flags |= NFT_TUNNEL_F_SEQ_NUMBER;
 665
 666         if (nla_put_be32(skb, NFTA_TUNNEL_KEY_FLAGS, htonl(flags)) < 0)
 667                 return -1;
 668
 669         return 0;
 670 }
 671
 672 static int nft_tunnel_obj_dump(struct sk_buff *skb,
 673                                struct nft_object *obj, bool reset)
 674 {
 675         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 676         struct ip_tunnel_info *info = &priv->md->u.tun_info;
 677
 678         if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ID,
 679                          tunnel_id_to_key32(info->key.tun_id)) ||
 680             nft_tunnel_ip_dump(skb, info) < 0 ||
 681             nft_tunnel_ports_dump(skb, info) < 0 ||
 682             nft_tunnel_flags_dump(skb, info) < 0 ||
 683             nla_put_u8(skb, NFTA_TUNNEL_KEY_TOS, info->key.tos) ||
 684             nla_put_u8(skb, NFTA_TUNNEL_KEY_TTL, info->key.ttl) ||
 685             nft_tunnel_opts_dump(skb, priv) < 0)
 686                 goto nla_put_failure;
 687
 688         return 0;
 689
 690 nla_put_failure:
 691         return -1;
 692 }
 693
 694 static void nft_tunnel_obj_destroy(const struct nft_ctx *ctx,
 695                                    struct nft_object *obj)
 696 {
 697         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 698
 699         metadata_dst_free(priv->md);
 700 }
 701
 702 static struct nft_object_type nft_tunnel_obj_type;
 703 static const struct nft_object_ops nft_tunnel_obj_ops = {
 704         .type           = &nft_tunnel_obj_type,
 705         .size           = sizeof(struct nft_tunnel_obj),
 706         .eval           = nft_tunnel_obj_eval,
 707         .init           = nft_tunnel_obj_init,
 708         .destroy        = nft_tunnel_obj_destroy,
 709         .dump           = nft_tunnel_obj_dump,
 710 };
 711
 712 static struct nft_object_type nft_tunnel_obj_type __read_mostly = {
 713         .type           = NFT_OBJECT_TUNNEL,
 714         .ops            = &nft_tunnel_obj_ops,
 715         .maxattr        = NFTA_TUNNEL_KEY_MAX,
 716         .policy         = nft_tunnel_key_policy,
 717         .owner          = THIS_MODULE,
 718 };
 719
 720 static int __init nft_tunnel_module_init(void)
 721 {
 722         int err;
 723
 724         err = nft_register_expr(&nft_tunnel_type);
 725         if (err < 0)
 726                 return err;
 727
 728         err = nft_register_obj(&nft_tunnel_obj_type);
 729         if (err < 0)
 730                 nft_unregister_expr(&nft_tunnel_type);
 731
 732         return err;
 733 }
 734
 735 static void __exit nft_tunnel_module_exit(void)
 736 {
 737         nft_unregister_obj(&nft_tunnel_obj_type);
 738         nft_unregister_expr(&nft_tunnel_type);
 739 }
 740
 741 module_init(nft_tunnel_module_init);
 742 module_exit(nft_tunnel_module_exit);
 743
 744 MODULE_LICENSE("GPL");
 745 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
 746 MODULE_ALIAS_NFT_EXPR("tunnel");
 747 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_TUNNEL);
 748 MODULE_DESCRIPTION("nftables tunnel expression support");