Pablo Neira Ayuso | af308b9 | 2018-08-02 20:51:39 +0200 | [diff] [blame] | 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 | |
Pablo Neira Ayuso | aaecfdb | 2018-08-02 20:51:46 +0200 | [diff] [blame] | 15 | struct nft_tunnel { |
| 16 | enum nft_tunnel_keys key:8; |
| 17 | enum nft_registers dreg:8; |
wenxu | a46c52d | 2019-01-29 15:51:17 +0800 | [diff] [blame] | 18 | enum nft_tunnel_mode mode:8; |
Pablo Neira Ayuso | aaecfdb | 2018-08-02 20:51:46 +0200 | [diff] [blame] | 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 = ®s->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: |
wenxu | a46c52d | 2019-01-29 15:51:17 +0800 | [diff] [blame] | 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); |
Pablo Neira Ayuso | aaecfdb | 2018-08-02 20:51:46 +0200 | [diff] [blame] | 45 | break; |
| 46 | case NFT_TUNNEL_ID: |
| 47 | if (!tun_info) { |
| 48 | regs->verdict.code = NFT_BREAK; |
| 49 | return; |
| 50 | } |
wenxu | a46c52d | 2019-01-29 15:51:17 +0800 | [diff] [blame] | 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; |
Pablo Neira Ayuso | aaecfdb | 2018-08-02 20:51:46 +0200 | [diff] [blame] | 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 }, |
wenxu | a46c52d | 2019-01-29 15:51:17 +0800 | [diff] [blame] | 69 | [NFTA_TUNNEL_MODE] = { .type = NLA_U32 }, |
Pablo Neira Ayuso | aaecfdb | 2018-08-02 20:51:46 +0200 | [diff] [blame] | 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 | |
wenxu | a46c52d | 2019-01-29 15:51:17 +0800 | [diff] [blame] | 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 | |
Pablo Neira Ayuso | aaecfdb | 2018-08-02 20:51:46 +0200 | [diff] [blame] | 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; |
wenxu | a46c52d | 2019-01-29 15:51:17 +0800 | [diff] [blame] | 118 | if (nla_put_be32(skb, NFTA_TUNNEL_MODE, htonl(priv->mode))) |
| 119 | goto nla_put_failure; |
Pablo Neira Ayuso | aaecfdb | 2018-08-02 20:51:46 +0200 | [diff] [blame] | 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 | |
Pablo Neira Ayuso | af308b9 | 2018-08-02 20:51:39 +0200 | [diff] [blame] | 143 | struct nft_tunnel_opts { |
| 144 | union { |
| 145 | struct vxlan_metadata vxlan; |
| 146 | struct erspan_metadata erspan; |
| 147 | } u; |
| 148 | u32 len; |
Pablo Neira Ayuso | 483f3fd | 2018-08-04 00:31:48 +0200 | [diff] [blame] | 149 | __be16 flags; |
Pablo Neira Ayuso | af308b9 | 2018-08-02 20:51:39 +0200 | [diff] [blame] | 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(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(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(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(tb, NFTA_TUNNEL_KEY_ERSPAN_MAX, attr, |
| 264 | nft_tunnel_opts_erspan_policy, NULL); |
| 265 | if (err < 0) |
| 266 | return err; |
| 267 | |
| 268 | version = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION])); |
| 269 | switch (version) { |
| 270 | case ERSPAN_VERSION: |
| 271 | if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]) |
| 272 | return -EINVAL; |
| 273 | |
| 274 | opts->u.erspan.u.index = |
| 275 | nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]); |
| 276 | break; |
| 277 | case ERSPAN_VERSION2: |
| 278 | if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR] || |
| 279 | !tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]) |
| 280 | return -EINVAL; |
| 281 | |
| 282 | hwid = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]); |
| 283 | dir = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR]); |
| 284 | |
| 285 | set_hwid(&opts->u.erspan.u.md2, hwid); |
| 286 | opts->u.erspan.u.md2.dir = dir; |
| 287 | break; |
| 288 | default: |
| 289 | return -EOPNOTSUPP; |
| 290 | } |
| 291 | opts->u.erspan.version = version; |
| 292 | |
| 293 | opts->len = sizeof(struct erspan_metadata); |
| 294 | opts->flags = TUNNEL_ERSPAN_OPT; |
| 295 | |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | static const struct nla_policy nft_tunnel_opts_policy[NFTA_TUNNEL_KEY_OPTS_MAX + 1] = { |
| 300 | [NFTA_TUNNEL_KEY_OPTS_VXLAN] = { .type = NLA_NESTED, }, |
| 301 | [NFTA_TUNNEL_KEY_OPTS_ERSPAN] = { .type = NLA_NESTED, }, |
| 302 | }; |
| 303 | |
| 304 | static int nft_tunnel_obj_opts_init(const struct nft_ctx *ctx, |
| 305 | const struct nlattr *attr, |
| 306 | struct ip_tunnel_info *info, |
| 307 | struct nft_tunnel_opts *opts) |
| 308 | { |
| 309 | struct nlattr *tb[NFTA_TUNNEL_KEY_OPTS_MAX + 1]; |
| 310 | int err; |
| 311 | |
| 312 | err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_OPTS_MAX, attr, |
| 313 | nft_tunnel_opts_policy, NULL); |
| 314 | if (err < 0) |
| 315 | return err; |
| 316 | |
| 317 | if (tb[NFTA_TUNNEL_KEY_OPTS_VXLAN]) { |
| 318 | err = nft_tunnel_obj_vxlan_init(tb[NFTA_TUNNEL_KEY_OPTS_VXLAN], |
| 319 | opts); |
| 320 | } else if (tb[NFTA_TUNNEL_KEY_OPTS_ERSPAN]) { |
| 321 | err = nft_tunnel_obj_erspan_init(tb[NFTA_TUNNEL_KEY_OPTS_ERSPAN], |
| 322 | opts); |
| 323 | } else { |
| 324 | return -EOPNOTSUPP; |
| 325 | } |
| 326 | |
| 327 | return err; |
| 328 | } |
| 329 | |
| 330 | static const struct nla_policy nft_tunnel_key_policy[NFTA_TUNNEL_KEY_MAX + 1] = { |
| 331 | [NFTA_TUNNEL_KEY_IP] = { .type = NLA_NESTED, }, |
| 332 | [NFTA_TUNNEL_KEY_IP6] = { .type = NLA_NESTED, }, |
| 333 | [NFTA_TUNNEL_KEY_ID] = { .type = NLA_U32, }, |
| 334 | [NFTA_TUNNEL_KEY_FLAGS] = { .type = NLA_U32, }, |
| 335 | [NFTA_TUNNEL_KEY_TOS] = { .type = NLA_U8, }, |
| 336 | [NFTA_TUNNEL_KEY_TTL] = { .type = NLA_U8, }, |
| 337 | [NFTA_TUNNEL_KEY_OPTS] = { .type = NLA_NESTED, }, |
| 338 | }; |
| 339 | |
| 340 | static int nft_tunnel_obj_init(const struct nft_ctx *ctx, |
| 341 | const struct nlattr * const tb[], |
| 342 | struct nft_object *obj) |
| 343 | { |
| 344 | struct nft_tunnel_obj *priv = nft_obj_data(obj); |
| 345 | struct ip_tunnel_info info; |
| 346 | struct metadata_dst *md; |
| 347 | int err; |
| 348 | |
| 349 | if (!tb[NFTA_TUNNEL_KEY_ID]) |
| 350 | return -EINVAL; |
| 351 | |
| 352 | memset(&info, 0, sizeof(info)); |
| 353 | info.mode = IP_TUNNEL_INFO_TX; |
| 354 | info.key.tun_id = key32_to_tunnel_id(nla_get_be32(tb[NFTA_TUNNEL_KEY_ID])); |
| 355 | info.key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; |
| 356 | |
| 357 | if (tb[NFTA_TUNNEL_KEY_IP]) { |
| 358 | err = nft_tunnel_obj_ip_init(ctx, tb[NFTA_TUNNEL_KEY_IP], &info); |
| 359 | if (err < 0) |
| 360 | return err; |
| 361 | } else if (tb[NFTA_TUNNEL_KEY_IP6]) { |
| 362 | err = nft_tunnel_obj_ip6_init(ctx, tb[NFTA_TUNNEL_KEY_IP6], &info); |
| 363 | if (err < 0) |
| 364 | return err; |
| 365 | } else { |
| 366 | return -EINVAL; |
| 367 | } |
| 368 | |
| 369 | if (tb[NFTA_TUNNEL_KEY_SPORT]) { |
Pablo Neira Ayuso | 483f3fd | 2018-08-04 00:31:48 +0200 | [diff] [blame] | 370 | info.key.tp_src = nla_get_be16(tb[NFTA_TUNNEL_KEY_SPORT]); |
Pablo Neira Ayuso | af308b9 | 2018-08-02 20:51:39 +0200 | [diff] [blame] | 371 | } |
| 372 | if (tb[NFTA_TUNNEL_KEY_DPORT]) { |
Pablo Neira Ayuso | 483f3fd | 2018-08-04 00:31:48 +0200 | [diff] [blame] | 373 | info.key.tp_dst = nla_get_be16(tb[NFTA_TUNNEL_KEY_DPORT]); |
Pablo Neira Ayuso | af308b9 | 2018-08-02 20:51:39 +0200 | [diff] [blame] | 374 | } |
| 375 | |
| 376 | if (tb[NFTA_TUNNEL_KEY_FLAGS]) { |
| 377 | u32 tun_flags; |
| 378 | |
| 379 | tun_flags = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_FLAGS])); |
| 380 | if (tun_flags & ~NFT_TUNNEL_F_MASK) |
| 381 | return -EOPNOTSUPP; |
| 382 | |
| 383 | if (tun_flags & NFT_TUNNEL_F_ZERO_CSUM_TX) |
| 384 | info.key.tun_flags &= ~TUNNEL_CSUM; |
| 385 | if (tun_flags & NFT_TUNNEL_F_DONT_FRAGMENT) |
| 386 | info.key.tun_flags |= TUNNEL_DONT_FRAGMENT; |
| 387 | if (tun_flags & NFT_TUNNEL_F_SEQ_NUMBER) |
| 388 | info.key.tun_flags |= TUNNEL_SEQ; |
| 389 | } |
| 390 | if (tb[NFTA_TUNNEL_KEY_TOS]) |
| 391 | info.key.tos = nla_get_u8(tb[NFTA_TUNNEL_KEY_TOS]); |
| 392 | if (tb[NFTA_TUNNEL_KEY_TTL]) |
| 393 | info.key.ttl = nla_get_u8(tb[NFTA_TUNNEL_KEY_TTL]); |
| 394 | else |
| 395 | info.key.ttl = U8_MAX; |
| 396 | |
| 397 | if (tb[NFTA_TUNNEL_KEY_OPTS]) { |
| 398 | err = nft_tunnel_obj_opts_init(ctx, tb[NFTA_TUNNEL_KEY_OPTS], |
| 399 | &info, &priv->opts); |
| 400 | if (err < 0) |
| 401 | return err; |
| 402 | } |
| 403 | |
| 404 | md = metadata_dst_alloc(priv->opts.len, METADATA_IP_TUNNEL, GFP_KERNEL); |
| 405 | if (!md) |
| 406 | return -ENOMEM; |
| 407 | |
| 408 | memcpy(&md->u.tun_info, &info, sizeof(info)); |
wenxu | 3e511d5 | 2019-02-22 17:00:43 +0800 | [diff] [blame] | 409 | #ifdef CONFIG_DST_CACHE |
| 410 | err = dst_cache_init(&md->u.tun_info.dst_cache, GFP_KERNEL); |
| 411 | if (err < 0) { |
| 412 | metadata_dst_free(md); |
| 413 | return err; |
| 414 | } |
| 415 | #endif |
Pablo Neira Ayuso | af308b9 | 2018-08-02 20:51:39 +0200 | [diff] [blame] | 416 | ip_tunnel_info_opts_set(&md->u.tun_info, &priv->opts.u, priv->opts.len, |
| 417 | priv->opts.flags); |
| 418 | priv->md = md; |
| 419 | |
| 420 | return 0; |
| 421 | } |
| 422 | |
| 423 | static inline void nft_tunnel_obj_eval(struct nft_object *obj, |
| 424 | struct nft_regs *regs, |
| 425 | const struct nft_pktinfo *pkt) |
| 426 | { |
| 427 | struct nft_tunnel_obj *priv = nft_obj_data(obj); |
| 428 | struct sk_buff *skb = pkt->skb; |
| 429 | |
| 430 | skb_dst_drop(skb); |
| 431 | dst_hold((struct dst_entry *) priv->md); |
| 432 | skb_dst_set(skb, (struct dst_entry *) priv->md); |
| 433 | } |
| 434 | |
| 435 | static int nft_tunnel_ip_dump(struct sk_buff *skb, struct ip_tunnel_info *info) |
| 436 | { |
| 437 | struct nlattr *nest; |
| 438 | |
| 439 | if (info->mode & IP_TUNNEL_INFO_IPV6) { |
| 440 | nest = nla_nest_start(skb, NFTA_TUNNEL_KEY_IP6); |
| 441 | if (!nest) |
| 442 | return -1; |
| 443 | |
| 444 | if (nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_SRC, &info->key.u.ipv6.src) < 0 || |
| 445 | nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_DST, &info->key.u.ipv6.dst) < 0 || |
| 446 | nla_put_be32(skb, NFTA_TUNNEL_KEY_IP6_FLOWLABEL, info->key.label)) |
| 447 | return -1; |
| 448 | |
| 449 | nla_nest_end(skb, nest); |
| 450 | } else { |
| 451 | nest = nla_nest_start(skb, NFTA_TUNNEL_KEY_IP); |
| 452 | if (!nest) |
| 453 | return -1; |
| 454 | |
| 455 | if (nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_SRC, info->key.u.ipv4.src) < 0 || |
| 456 | nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_DST, info->key.u.ipv4.dst) < 0) |
| 457 | return -1; |
| 458 | |
| 459 | nla_nest_end(skb, nest); |
| 460 | } |
| 461 | |
| 462 | return 0; |
| 463 | } |
| 464 | |
| 465 | static int nft_tunnel_opts_dump(struct sk_buff *skb, |
| 466 | struct nft_tunnel_obj *priv) |
| 467 | { |
| 468 | struct nft_tunnel_opts *opts = &priv->opts; |
| 469 | struct nlattr *nest; |
| 470 | |
| 471 | nest = nla_nest_start(skb, NFTA_TUNNEL_KEY_OPTS); |
| 472 | if (!nest) |
| 473 | return -1; |
| 474 | |
| 475 | if (opts->flags & TUNNEL_VXLAN_OPT) { |
| 476 | if (nla_put_be32(skb, NFTA_TUNNEL_KEY_VXLAN_GBP, |
| 477 | htonl(opts->u.vxlan.gbp))) |
| 478 | return -1; |
| 479 | } else if (opts->flags & TUNNEL_ERSPAN_OPT) { |
| 480 | switch (opts->u.erspan.version) { |
| 481 | case ERSPAN_VERSION: |
| 482 | if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX, |
| 483 | opts->u.erspan.u.index)) |
| 484 | return -1; |
| 485 | break; |
| 486 | case ERSPAN_VERSION2: |
| 487 | if (nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_HWID, |
| 488 | get_hwid(&opts->u.erspan.u.md2)) || |
| 489 | nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_DIR, |
| 490 | opts->u.erspan.u.md2.dir)) |
| 491 | return -1; |
| 492 | break; |
| 493 | } |
| 494 | } |
| 495 | nla_nest_end(skb, nest); |
| 496 | |
| 497 | return 0; |
| 498 | } |
| 499 | |
| 500 | static int nft_tunnel_ports_dump(struct sk_buff *skb, |
| 501 | struct ip_tunnel_info *info) |
| 502 | { |
| 503 | if (nla_put_be16(skb, NFTA_TUNNEL_KEY_SPORT, htons(info->key.tp_src)) < 0 || |
| 504 | nla_put_be16(skb, NFTA_TUNNEL_KEY_DPORT, htons(info->key.tp_dst)) < 0) |
| 505 | return -1; |
| 506 | |
| 507 | return 0; |
| 508 | } |
| 509 | |
| 510 | static int nft_tunnel_flags_dump(struct sk_buff *skb, |
| 511 | struct ip_tunnel_info *info) |
| 512 | { |
| 513 | u32 flags = 0; |
| 514 | |
| 515 | if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) |
| 516 | flags |= NFT_TUNNEL_F_DONT_FRAGMENT; |
| 517 | if (!(info->key.tun_flags & TUNNEL_CSUM)) |
| 518 | flags |= NFT_TUNNEL_F_ZERO_CSUM_TX; |
| 519 | if (info->key.tun_flags & TUNNEL_SEQ) |
| 520 | flags |= NFT_TUNNEL_F_SEQ_NUMBER; |
| 521 | |
| 522 | if (nla_put_be32(skb, NFTA_TUNNEL_KEY_FLAGS, htonl(flags)) < 0) |
| 523 | return -1; |
| 524 | |
| 525 | return 0; |
| 526 | } |
| 527 | |
| 528 | static int nft_tunnel_obj_dump(struct sk_buff *skb, |
| 529 | struct nft_object *obj, bool reset) |
| 530 | { |
| 531 | struct nft_tunnel_obj *priv = nft_obj_data(obj); |
| 532 | struct ip_tunnel_info *info = &priv->md->u.tun_info; |
| 533 | |
| 534 | if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ID, |
| 535 | tunnel_id_to_key32(info->key.tun_id)) || |
| 536 | nft_tunnel_ip_dump(skb, info) < 0 || |
| 537 | nft_tunnel_ports_dump(skb, info) < 0 || |
| 538 | nft_tunnel_flags_dump(skb, info) < 0 || |
| 539 | nla_put_u8(skb, NFTA_TUNNEL_KEY_TOS, info->key.tos) || |
| 540 | nla_put_u8(skb, NFTA_TUNNEL_KEY_TTL, info->key.ttl) || |
| 541 | nft_tunnel_opts_dump(skb, priv) < 0) |
| 542 | goto nla_put_failure; |
| 543 | |
| 544 | return 0; |
| 545 | |
| 546 | nla_put_failure: |
| 547 | return -1; |
| 548 | } |
| 549 | |
| 550 | static void nft_tunnel_obj_destroy(const struct nft_ctx *ctx, |
| 551 | struct nft_object *obj) |
| 552 | { |
| 553 | struct nft_tunnel_obj *priv = nft_obj_data(obj); |
| 554 | |
| 555 | metadata_dst_free(priv->md); |
| 556 | } |
| 557 | |
| 558 | static struct nft_object_type nft_tunnel_obj_type; |
| 559 | static const struct nft_object_ops nft_tunnel_obj_ops = { |
| 560 | .type = &nft_tunnel_obj_type, |
| 561 | .size = sizeof(struct nft_tunnel_obj), |
| 562 | .eval = nft_tunnel_obj_eval, |
| 563 | .init = nft_tunnel_obj_init, |
| 564 | .destroy = nft_tunnel_obj_destroy, |
| 565 | .dump = nft_tunnel_obj_dump, |
| 566 | }; |
| 567 | |
| 568 | static struct nft_object_type nft_tunnel_obj_type __read_mostly = { |
| 569 | .type = NFT_OBJECT_TUNNEL, |
| 570 | .ops = &nft_tunnel_obj_ops, |
| 571 | .maxattr = NFTA_TUNNEL_KEY_MAX, |
| 572 | .policy = nft_tunnel_key_policy, |
| 573 | .owner = THIS_MODULE, |
| 574 | }; |
| 575 | |
| 576 | static int __init nft_tunnel_module_init(void) |
| 577 | { |
Pablo Neira Ayuso | aaecfdb | 2018-08-02 20:51:46 +0200 | [diff] [blame] | 578 | int err; |
| 579 | |
| 580 | err = nft_register_expr(&nft_tunnel_type); |
| 581 | if (err < 0) |
| 582 | return err; |
| 583 | |
| 584 | err = nft_register_obj(&nft_tunnel_obj_type); |
| 585 | if (err < 0) |
| 586 | nft_unregister_expr(&nft_tunnel_type); |
| 587 | |
| 588 | return err; |
Pablo Neira Ayuso | af308b9 | 2018-08-02 20:51:39 +0200 | [diff] [blame] | 589 | } |
| 590 | |
| 591 | static void __exit nft_tunnel_module_exit(void) |
| 592 | { |
| 593 | nft_unregister_obj(&nft_tunnel_obj_type); |
Pablo Neira Ayuso | aaecfdb | 2018-08-02 20:51:46 +0200 | [diff] [blame] | 594 | nft_unregister_expr(&nft_tunnel_type); |
Pablo Neira Ayuso | af308b9 | 2018-08-02 20:51:39 +0200 | [diff] [blame] | 595 | } |
| 596 | |
| 597 | module_init(nft_tunnel_module_init); |
| 598 | module_exit(nft_tunnel_module_exit); |
| 599 | |
| 600 | MODULE_LICENSE("GPL"); |
| 601 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |
Pablo Neira Ayuso | aaecfdb | 2018-08-02 20:51:46 +0200 | [diff] [blame] | 602 | MODULE_ALIAS_NFT_EXPR("tunnel"); |
Pablo Neira Ayuso | af308b9 | 2018-08-02 20:51:39 +0200 | [diff] [blame] | 603 | MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_TUNNEL); |