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 };
  21
  22 static void nft_tunnel_get_eval(const struct nft_expr *expr,
  23                                 struct nft_regs *regs,
  24                                 const struct nft_pktinfo *pkt)
  25 {
  26         const struct nft_tunnel *priv = nft_expr_priv(expr);
  27         u32 *dest = &regs->data[priv->dreg];
  28         struct ip_tunnel_info *tun_info;
  29
  30         tun_info = skb_tunnel_info(pkt->skb);
  31
  32         switch (priv->key) {
  33         case NFT_TUNNEL_PATH:
  34                 if (!tun_info) {
  35                         nft_reg_store8(dest, false);
  36                         return;
  37                 }
  38                 if (priv->mode == NFT_TUNNEL_MODE_NONE ||
  39                     (priv->mode == NFT_TUNNEL_MODE_RX &&
  40                      !(tun_info->mode & IP_TUNNEL_INFO_TX)) ||
  41                     (priv->mode == NFT_TUNNEL_MODE_TX &&
  42                      (tun_info->mode & IP_TUNNEL_INFO_TX)))
  43                         nft_reg_store8(dest, true);
  44                 else
  45                         nft_reg_store8(dest, false);
  46                 break;
  47         case NFT_TUNNEL_ID:
  48                 if (!tun_info) {
  49                         regs->verdict.code = NFT_BREAK;
  50                         return;
  51                 }
  52                 if (priv->mode == NFT_TUNNEL_MODE_NONE ||
  53                     (priv->mode == NFT_TUNNEL_MODE_RX &&
  54                      !(tun_info->mode & IP_TUNNEL_INFO_TX)) ||
  55                     (priv->mode == NFT_TUNNEL_MODE_TX &&
  56                      (tun_info->mode & IP_TUNNEL_INFO_TX)))
  57                         *dest = ntohl(tunnel_id_to_key32(tun_info->key.tun_id));
  58                 else
  59                         regs->verdict.code = NFT_BREAK;
  60                 break;
  61         default:
  62                 WARN_ON(1);
  63                 regs->verdict.code = NFT_BREAK;
  64         }
  65 }
  66
  67 static const struct nla_policy nft_tunnel_policy[NFTA_TUNNEL_MAX + 1] = {
  68         [NFTA_TUNNEL_KEY]       = { .type = NLA_U32 },
  69         [NFTA_TUNNEL_DREG]      = { .type = NLA_U32 },
  70         [NFTA_TUNNEL_MODE]      = { .type = NLA_U32 },
  71 };
  72
  73 static int nft_tunnel_get_init(const struct nft_ctx *ctx,
  74                                const struct nft_expr *expr,
  75                                const struct nlattr * const tb[])
  76 {
  77         struct nft_tunnel *priv = nft_expr_priv(expr);
  78         u32 len;
  79
  80         if (!tb[NFTA_TUNNEL_KEY] ||
  81             !tb[NFTA_TUNNEL_DREG])
  82                 return -EINVAL;
  83
  84         priv->key = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY]));
  85         switch (priv->key) {
  86         case NFT_TUNNEL_PATH:
  87                 len = sizeof(u8);
  88                 break;
  89         case NFT_TUNNEL_ID:
  90                 len = sizeof(u32);
  91                 break;
  92         default:
  93                 return -EOPNOTSUPP;
  94         }
  95
  96         if (tb[NFTA_TUNNEL_MODE]) {
  97                 priv->mode = ntohl(nla_get_be32(tb[NFTA_TUNNEL_MODE]));
  98                 if (priv->mode > NFT_TUNNEL_MODE_MAX)
  99                         return -EOPNOTSUPP;
 100         } else {
 101                 priv->mode = NFT_TUNNEL_MODE_NONE;
 102         }
 103
 104         return nft_parse_register_store(ctx, tb[NFTA_TUNNEL_DREG], &priv->dreg,
 105                                         NULL, NFT_DATA_VALUE, len);
 106 }
 107
 108 static int nft_tunnel_get_dump(struct sk_buff *skb,
 109                                const struct nft_expr *expr)
 110 {
 111         const struct nft_tunnel *priv = nft_expr_priv(expr);
 112
 113         if (nla_put_be32(skb, NFTA_TUNNEL_KEY, htonl(priv->key)))
 114                 goto nla_put_failure;
 115         if (nft_dump_register(skb, NFTA_TUNNEL_DREG, priv->dreg))
 116                 goto nla_put_failure;
 117         if (nla_put_be32(skb, NFTA_TUNNEL_MODE, htonl(priv->mode)))
 118                 goto nla_put_failure;
 119         return 0;
 120
 121 nla_put_failure:
 122         return -1;
 123 }
 124
 125 static struct nft_expr_type nft_tunnel_type;
 126 static const struct nft_expr_ops nft_tunnel_get_ops = {
 127         .type           = &nft_tunnel_type,
 128         .size           = NFT_EXPR_SIZE(sizeof(struct nft_tunnel)),
 129         .eval           = nft_tunnel_get_eval,
 130         .init           = nft_tunnel_get_init,
 131         .dump           = nft_tunnel_get_dump,
 132 };
 133
 134 static struct nft_expr_type nft_tunnel_type __read_mostly = {
 135         .name           = "tunnel",
 136         .ops            = &nft_tunnel_get_ops,
 137         .policy         = nft_tunnel_policy,
 138         .maxattr        = NFTA_TUNNEL_MAX,
 139         .owner          = THIS_MODULE,
 140 };
 141
 142 struct nft_tunnel_opts {
 143         union {
 144                 struct vxlan_metadata   vxlan;
 145                 struct erspan_metadata  erspan;
 146                 u8      data[IP_TUNNEL_OPTS_MAX];
 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_VERSION]        = { .type = NLA_U32 },
 252         [NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]       = { .type = NLA_U32 },
 253         [NFTA_TUNNEL_KEY_ERSPAN_V2_DIR]         = { .type = NLA_U8 },
 254         [NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]        = { .type = NLA_U8 },
 255 };
 256
 257 static int nft_tunnel_obj_erspan_init(const struct nlattr *attr,
 258                                       struct nft_tunnel_opts *opts)
 259 {
 260         struct nlattr *tb[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1];
 261         uint8_t hwid, dir;
 262         int err, version;
 263
 264         err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_ERSPAN_MAX,
 265                                           attr, nft_tunnel_opts_erspan_policy,
 266                                           NULL);
 267         if (err < 0)
 268                 return err;
 269
 270         if (!tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION])
 271                  return -EINVAL;
 272
 273         version = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION]));
 274         switch (version) {
 275         case ERSPAN_VERSION:
 276                 if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX])
 277                         return -EINVAL;
 278
 279                 opts->u.erspan.u.index =
 280                         nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]);
 281                 break;
 282         case ERSPAN_VERSION2:
 283                 if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR] ||
 284                     !tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID])
 285                         return -EINVAL;
 286
 287                 hwid = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]);
 288                 dir = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR]);
 289
 290                 set_hwid(&opts->u.erspan.u.md2, hwid);
 291                 opts->u.erspan.u.md2.dir = dir;
 292                 break;
 293         default:
 294                 return -EOPNOTSUPP;
 295         }
 296         opts->u.erspan.version = version;
 297
 298         opts->len       = sizeof(struct erspan_metadata);
 299         opts->flags     = TUNNEL_ERSPAN_OPT;
 300
 301         return 0;
 302 }
 303
 304 static const struct nla_policy nft_tunnel_opts_geneve_policy[NFTA_TUNNEL_KEY_GENEVE_MAX + 1] = {
 305         [NFTA_TUNNEL_KEY_GENEVE_CLASS]  = { .type = NLA_U16 },
 306         [NFTA_TUNNEL_KEY_GENEVE_TYPE]   = { .type = NLA_U8 },
 307         [NFTA_TUNNEL_KEY_GENEVE_DATA]   = { .type = NLA_BINARY, .len = 128 },
 308 };
 309
 310 static int nft_tunnel_obj_geneve_init(const struct nlattr *attr,
 311                                       struct nft_tunnel_opts *opts)
 312 {
 313         struct geneve_opt *opt = (struct geneve_opt *)opts->u.data + opts->len;
 314         struct nlattr *tb[NFTA_TUNNEL_KEY_GENEVE_MAX + 1];
 315         int err, data_len;
 316
 317         err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_GENEVE_MAX, attr,
 318                                nft_tunnel_opts_geneve_policy, NULL);
 319         if (err < 0)
 320                 return err;
 321
 322         if (!tb[NFTA_TUNNEL_KEY_GENEVE_CLASS] ||
 323             !tb[NFTA_TUNNEL_KEY_GENEVE_TYPE] ||
 324             !tb[NFTA_TUNNEL_KEY_GENEVE_DATA])
 325                 return -EINVAL;
 326
 327         attr = tb[NFTA_TUNNEL_KEY_GENEVE_DATA];
 328         data_len = nla_len(attr);
 329         if (data_len % 4)
 330                 return -EINVAL;
 331
 332         opts->len += sizeof(*opt) + data_len;
 333         if (opts->len > IP_TUNNEL_OPTS_MAX)
 334                 return -EINVAL;
 335
 336         memcpy(opt->opt_data, nla_data(attr), data_len);
 337         opt->length = data_len / 4;
 338         opt->opt_class = nla_get_be16(tb[NFTA_TUNNEL_KEY_GENEVE_CLASS]);
 339         opt->type = nla_get_u8(tb[NFTA_TUNNEL_KEY_GENEVE_TYPE]);
 340         opts->flags = TUNNEL_GENEVE_OPT;
 341
 342         return 0;
 343 }
 344
 345 static const struct nla_policy nft_tunnel_opts_policy[NFTA_TUNNEL_KEY_OPTS_MAX + 1] = {
 346         [NFTA_TUNNEL_KEY_OPTS_UNSPEC]   = {
 347                 .strict_start_type = NFTA_TUNNEL_KEY_OPTS_GENEVE },
 348         [NFTA_TUNNEL_KEY_OPTS_VXLAN]    = { .type = NLA_NESTED, },
 349         [NFTA_TUNNEL_KEY_OPTS_ERSPAN]   = { .type = NLA_NESTED, },
 350         [NFTA_TUNNEL_KEY_OPTS_GENEVE]   = { .type = NLA_NESTED, },
 351 };
 352
 353 static int nft_tunnel_obj_opts_init(const struct nft_ctx *ctx,
 354                                     const struct nlattr *attr,
 355                                     struct ip_tunnel_info *info,
 356                                     struct nft_tunnel_opts *opts)
 357 {
 358         int err, rem, type = 0;
 359         struct nlattr *nla;
 360
 361         err = nla_validate_nested_deprecated(attr, NFTA_TUNNEL_KEY_OPTS_MAX,
 362                                              nft_tunnel_opts_policy, NULL);
 363         if (err < 0)
 364                 return err;
 365
 366         nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) {
 367                 switch (nla_type(nla)) {
 368                 case NFTA_TUNNEL_KEY_OPTS_VXLAN:
 369                         if (type)
 370                                 return -EINVAL;
 371                         err = nft_tunnel_obj_vxlan_init(nla, opts);
 372                         if (err)
 373                                 return err;
 374                         type = TUNNEL_VXLAN_OPT;
 375                         break;
 376                 case NFTA_TUNNEL_KEY_OPTS_ERSPAN:
 377                         if (type)
 378                                 return -EINVAL;
 379                         err = nft_tunnel_obj_erspan_init(nla, opts);
 380                         if (err)
 381                                 return err;
 382                         type = TUNNEL_ERSPAN_OPT;
 383                         break;
 384                 case NFTA_TUNNEL_KEY_OPTS_GENEVE:
 385                         if (type && type != TUNNEL_GENEVE_OPT)
 386                                 return -EINVAL;
 387                         err = nft_tunnel_obj_geneve_init(nla, opts);
 388                         if (err)
 389                                 return err;
 390                         type = TUNNEL_GENEVE_OPT;
 391                         break;
 392                 default:
 393                         return -EOPNOTSUPP;
 394                 }
 395         }
 396
 397         return err;
 398 }
 399
 400 static const struct nla_policy nft_tunnel_key_policy[NFTA_TUNNEL_KEY_MAX + 1] = {
 401         [NFTA_TUNNEL_KEY_IP]    = { .type = NLA_NESTED, },
 402         [NFTA_TUNNEL_KEY_IP6]   = { .type = NLA_NESTED, },
 403         [NFTA_TUNNEL_KEY_ID]    = { .type = NLA_U32, },
 404         [NFTA_TUNNEL_KEY_FLAGS] = { .type = NLA_U32, },
 405         [NFTA_TUNNEL_KEY_TOS]   = { .type = NLA_U8, },
 406         [NFTA_TUNNEL_KEY_TTL]   = { .type = NLA_U8, },
 407         [NFTA_TUNNEL_KEY_SPORT] = { .type = NLA_U16, },
 408         [NFTA_TUNNEL_KEY_DPORT] = { .type = NLA_U16, },
 409         [NFTA_TUNNEL_KEY_OPTS]  = { .type = NLA_NESTED, },
 410 };
 411
 412 static int nft_tunnel_obj_init(const struct nft_ctx *ctx,
 413                                const struct nlattr * const tb[],
 414                                struct nft_object *obj)
 415 {
 416         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 417         struct ip_tunnel_info info;
 418         struct metadata_dst *md;
 419         int err;
 420
 421         if (!tb[NFTA_TUNNEL_KEY_ID])
 422                 return -EINVAL;
 423
 424         memset(&info, 0, sizeof(info));
 425         info.mode               = IP_TUNNEL_INFO_TX;
 426         info.key.tun_id         = key32_to_tunnel_id(nla_get_be32(tb[NFTA_TUNNEL_KEY_ID]));
 427         info.key.tun_flags      = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
 428
 429         if (tb[NFTA_TUNNEL_KEY_IP]) {
 430                 err = nft_tunnel_obj_ip_init(ctx, tb[NFTA_TUNNEL_KEY_IP], &info);
 431                 if (err < 0)
 432                         return err;
 433         } else if (tb[NFTA_TUNNEL_KEY_IP6]) {
 434                 err = nft_tunnel_obj_ip6_init(ctx, tb[NFTA_TUNNEL_KEY_IP6], &info);
 435                 if (err < 0)
 436                         return err;
 437         } else {
 438                 return -EINVAL;
 439         }
 440
 441         if (tb[NFTA_TUNNEL_KEY_SPORT]) {
 442                 info.key.tp_src = nla_get_be16(tb[NFTA_TUNNEL_KEY_SPORT]);
 443         }
 444         if (tb[NFTA_TUNNEL_KEY_DPORT]) {
 445                 info.key.tp_dst = nla_get_be16(tb[NFTA_TUNNEL_KEY_DPORT]);
 446         }
 447
 448         if (tb[NFTA_TUNNEL_KEY_FLAGS]) {
 449                 u32 tun_flags;
 450
 451                 tun_flags = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_FLAGS]));
 452                 if (tun_flags & ~NFT_TUNNEL_F_MASK)
 453                         return -EOPNOTSUPP;
 454
 455                 if (tun_flags & NFT_TUNNEL_F_ZERO_CSUM_TX)
 456                         info.key.tun_flags &= ~TUNNEL_CSUM;
 457                 if (tun_flags & NFT_TUNNEL_F_DONT_FRAGMENT)
 458                         info.key.tun_flags |= TUNNEL_DONT_FRAGMENT;
 459                 if (tun_flags & NFT_TUNNEL_F_SEQ_NUMBER)
 460                         info.key.tun_flags |= TUNNEL_SEQ;
 461         }
 462         if (tb[NFTA_TUNNEL_KEY_TOS])
 463                 info.key.tos = nla_get_u8(tb[NFTA_TUNNEL_KEY_TOS]);
 464         if (tb[NFTA_TUNNEL_KEY_TTL])
 465                 info.key.ttl = nla_get_u8(tb[NFTA_TUNNEL_KEY_TTL]);
 466         else
 467                 info.key.ttl = U8_MAX;
 468
 469         if (tb[NFTA_TUNNEL_KEY_OPTS]) {
 470                 err = nft_tunnel_obj_opts_init(ctx, tb[NFTA_TUNNEL_KEY_OPTS],
 471                                                &info, &priv->opts);
 472                 if (err < 0)
 473                         return err;
 474         }
 475
 476         md = metadata_dst_alloc(priv->opts.len, METADATA_IP_TUNNEL, GFP_KERNEL);
 477         if (!md)
 478                 return -ENOMEM;
 479
 480         memcpy(&md->u.tun_info, &info, sizeof(info));
 481 #ifdef CONFIG_DST_CACHE
 482         err = dst_cache_init(&md->u.tun_info.dst_cache, GFP_KERNEL);
 483         if (err < 0) {
 484                 metadata_dst_free(md);
 485                 return err;
 486         }
 487 #endif
 488         ip_tunnel_info_opts_set(&md->u.tun_info, &priv->opts.u, priv->opts.len,
 489                                 priv->opts.flags);
 490         priv->md = md;
 491
 492         return 0;
 493 }
 494
 495 static inline void nft_tunnel_obj_eval(struct nft_object *obj,
 496                                        struct nft_regs *regs,
 497                                        const struct nft_pktinfo *pkt)
 498 {
 499         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 500         struct sk_buff *skb = pkt->skb;
 501
 502         skb_dst_drop(skb);
 503         dst_hold((struct dst_entry *) priv->md);
 504         skb_dst_set(skb, (struct dst_entry *) priv->md);
 505 }
 506
 507 static int nft_tunnel_ip_dump(struct sk_buff *skb, struct ip_tunnel_info *info)
 508 {
 509         struct nlattr *nest;
 510
 511         if (info->mode & IP_TUNNEL_INFO_IPV6) {
 512                 nest = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_IP6);
 513                 if (!nest)
 514                         return -1;
 515
 516                 if (nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_SRC,
 517                                      &info->key.u.ipv6.src) < 0 ||
 518                     nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_DST,
 519                                      &info->key.u.ipv6.dst) < 0 ||
 520                     nla_put_be32(skb, NFTA_TUNNEL_KEY_IP6_FLOWLABEL,
 521                                  info->key.label)) {
 522                         nla_nest_cancel(skb, nest);
 523                         return -1;
 524                 }
 525
 526                 nla_nest_end(skb, nest);
 527         } else {
 528                 nest = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_IP);
 529                 if (!nest)
 530                         return -1;
 531
 532                 if (nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_SRC,
 533                                     info->key.u.ipv4.src) < 0 ||
 534                     nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_DST,
 535                                     info->key.u.ipv4.dst) < 0) {
 536                         nla_nest_cancel(skb, nest);
 537                         return -1;
 538                 }
 539
 540                 nla_nest_end(skb, nest);
 541         }
 542
 543         return 0;
 544 }
 545
 546 static int nft_tunnel_opts_dump(struct sk_buff *skb,
 547                                 struct nft_tunnel_obj *priv)
 548 {
 549         struct nft_tunnel_opts *opts = &priv->opts;
 550         struct nlattr *nest, *inner;
 551
 552         nest = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_OPTS);
 553         if (!nest)
 554                 return -1;
 555
 556         if (opts->flags & TUNNEL_VXLAN_OPT) {
 557                 inner = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_OPTS_VXLAN);
 558                 if (!inner)
 559                         goto failure;
 560                 if (nla_put_be32(skb, NFTA_TUNNEL_KEY_VXLAN_GBP,
 561                                  htonl(opts->u.vxlan.gbp)))
 562                         goto inner_failure;
 563                 nla_nest_end(skb, inner);
 564         } else if (opts->flags & TUNNEL_ERSPAN_OPT) {
 565                 inner = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_OPTS_ERSPAN);
 566                 if (!inner)
 567                         goto failure;
 568                 if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ERSPAN_VERSION,
 569                                  htonl(opts->u.erspan.version)))
 570                         goto inner_failure;
 571                 switch (opts->u.erspan.version) {
 572                 case ERSPAN_VERSION:
 573                         if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX,
 574                                          opts->u.erspan.u.index))
 575                                 goto inner_failure;
 576                         break;
 577                 case ERSPAN_VERSION2:
 578                         if (nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_HWID,
 579                                        get_hwid(&opts->u.erspan.u.md2)) ||
 580                             nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_DIR,
 581                                        opts->u.erspan.u.md2.dir))
 582                                 goto inner_failure;
 583                         break;
 584                 }
 585                 nla_nest_end(skb, inner);
 586         } else if (opts->flags & TUNNEL_GENEVE_OPT) {
 587                 struct geneve_opt *opt;
 588                 int offset = 0;
 589
 590                 inner = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_OPTS_GENEVE);
 591                 if (!inner)
 592                         goto failure;
 593                 while (opts->len > offset) {
 594                         opt = (struct geneve_opt *)opts->u.data + offset;
 595                         if (nla_put_be16(skb, NFTA_TUNNEL_KEY_GENEVE_CLASS,
 596                                          opt->opt_class) ||
 597                             nla_put_u8(skb, NFTA_TUNNEL_KEY_GENEVE_TYPE,
 598                                        opt->type) ||
 599                             nla_put(skb, NFTA_TUNNEL_KEY_GENEVE_DATA,
 600                                     opt->length * 4, opt->opt_data))
 601                                 goto inner_failure;
 602                         offset += sizeof(*opt) + opt->length * 4;
 603                 }
 604                 nla_nest_end(skb, inner);
 605         }
 606         nla_nest_end(skb, nest);
 607         return 0;
 608
 609 inner_failure:
 610         nla_nest_cancel(skb, inner);
 611 failure:
 612         nla_nest_cancel(skb, nest);
 613         return -1;
 614 }
 615
 616 static int nft_tunnel_ports_dump(struct sk_buff *skb,
 617                                  struct ip_tunnel_info *info)
 618 {
 619         if (nla_put_be16(skb, NFTA_TUNNEL_KEY_SPORT, info->key.tp_src) < 0 ||
 620             nla_put_be16(skb, NFTA_TUNNEL_KEY_DPORT, info->key.tp_dst) < 0)
 621                 return -1;
 622
 623         return 0;
 624 }
 625
 626 static int nft_tunnel_flags_dump(struct sk_buff *skb,
 627                                  struct ip_tunnel_info *info)
 628 {
 629         u32 flags = 0;
 630
 631         if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
 632                 flags |= NFT_TUNNEL_F_DONT_FRAGMENT;
 633         if (!(info->key.tun_flags & TUNNEL_CSUM))
 634                 flags |= NFT_TUNNEL_F_ZERO_CSUM_TX;
 635         if (info->key.tun_flags & TUNNEL_SEQ)
 636                 flags |= NFT_TUNNEL_F_SEQ_NUMBER;
 637
 638         if (nla_put_be32(skb, NFTA_TUNNEL_KEY_FLAGS, htonl(flags)) < 0)
 639                 return -1;
 640
 641         return 0;
 642 }
 643
 644 static int nft_tunnel_obj_dump(struct sk_buff *skb,
 645                                struct nft_object *obj, bool reset)
 646 {
 647         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 648         struct ip_tunnel_info *info = &priv->md->u.tun_info;
 649
 650         if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ID,
 651                          tunnel_id_to_key32(info->key.tun_id)) ||
 652             nft_tunnel_ip_dump(skb, info) < 0 ||
 653             nft_tunnel_ports_dump(skb, info) < 0 ||
 654             nft_tunnel_flags_dump(skb, info) < 0 ||
 655             nla_put_u8(skb, NFTA_TUNNEL_KEY_TOS, info->key.tos) ||
 656             nla_put_u8(skb, NFTA_TUNNEL_KEY_TTL, info->key.ttl) ||
 657             nft_tunnel_opts_dump(skb, priv) < 0)
 658                 goto nla_put_failure;
 659
 660         return 0;
 661
 662 nla_put_failure:
 663         return -1;
 664 }
 665
 666 static void nft_tunnel_obj_destroy(const struct nft_ctx *ctx,
 667                                    struct nft_object *obj)
 668 {
 669         struct nft_tunnel_obj *priv = nft_obj_data(obj);
 670
 671         metadata_dst_free(priv->md);
 672 }
 673
 674 static struct nft_object_type nft_tunnel_obj_type;
 675 static const struct nft_object_ops nft_tunnel_obj_ops = {
 676         .type           = &nft_tunnel_obj_type,
 677         .size           = sizeof(struct nft_tunnel_obj),
 678         .eval           = nft_tunnel_obj_eval,
 679         .init           = nft_tunnel_obj_init,
 680         .destroy        = nft_tunnel_obj_destroy,
 681         .dump           = nft_tunnel_obj_dump,
 682 };
 683
 684 static struct nft_object_type nft_tunnel_obj_type __read_mostly = {
 685         .type           = NFT_OBJECT_TUNNEL,
 686         .ops            = &nft_tunnel_obj_ops,
 687         .maxattr        = NFTA_TUNNEL_KEY_MAX,
 688         .policy         = nft_tunnel_key_policy,
 689         .owner          = THIS_MODULE,
 690 };
 691
 692 static int __init nft_tunnel_module_init(void)
 693 {
 694         int err;
 695
 696         err = nft_register_expr(&nft_tunnel_type);
 697         if (err < 0)
 698                 return err;
 699
 700         err = nft_register_obj(&nft_tunnel_obj_type);
 701         if (err < 0)
 702                 nft_unregister_expr(&nft_tunnel_type);
 703
 704         return err;
 705 }
 706
 707 static void __exit nft_tunnel_module_exit(void)
 708 {
 709         nft_unregister_obj(&nft_tunnel_obj_type);
 710         nft_unregister_expr(&nft_tunnel_type);
 711 }
 712
 713 module_init(nft_tunnel_module_init);
 714 module_exit(nft_tunnel_module_exit);
 715
 716 MODULE_LICENSE("GPL");
 717 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
 718 MODULE_ALIAS_NFT_EXPR("tunnel");
 719 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_TUNNEL);
 720 MODULE_DESCRIPTION("nftables tunnel expression support");