Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1 | /* |
| 2 | * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This software has been sponsored by Sophos Astaro <http://www.sophos.com> |
| 9 | */ |
| 10 | |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/netlink.h> |
| 15 | #include <linux/netfilter.h> |
| 16 | #include <linux/netfilter/nfnetlink.h> |
| 17 | #include <linux/netfilter/nf_tables.h> |
| 18 | #include <linux/netfilter/nf_tables_compat.h> |
| 19 | #include <linux/netfilter/x_tables.h> |
| 20 | #include <linux/netfilter_ipv4/ip_tables.h> |
| 21 | #include <linux/netfilter_ipv6/ip6_tables.h> |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 22 | #include <net/netfilter/nf_tables.h> |
| 23 | |
Pablo Neira Ayuso | f3f5dde | 2014-10-14 10:13:48 +0200 | [diff] [blame] | 24 | static const struct { |
| 25 | const char *name; |
| 26 | u8 type; |
| 27 | } table_to_chaintype[] = { |
| 28 | { "filter", NFT_CHAIN_T_DEFAULT }, |
| 29 | { "raw", NFT_CHAIN_T_DEFAULT }, |
| 30 | { "security", NFT_CHAIN_T_DEFAULT }, |
| 31 | { "mangle", NFT_CHAIN_T_ROUTE }, |
| 32 | { "nat", NFT_CHAIN_T_NAT }, |
| 33 | { }, |
| 34 | }; |
| 35 | |
| 36 | static int nft_compat_table_to_chaintype(const char *table) |
| 37 | { |
| 38 | int i; |
| 39 | |
| 40 | for (i = 0; table_to_chaintype[i].name != NULL; i++) { |
| 41 | if (strcmp(table_to_chaintype[i].name, table) == 0) |
| 42 | return table_to_chaintype[i].type; |
| 43 | } |
| 44 | |
| 45 | return -1; |
| 46 | } |
| 47 | |
| 48 | static int nft_compat_chain_validate_dependency(const char *tablename, |
| 49 | const struct nft_chain *chain) |
| 50 | { |
| 51 | enum nft_chain_type type; |
| 52 | const struct nft_base_chain *basechain; |
| 53 | |
| 54 | if (!tablename || !(chain->flags & NFT_BASE_CHAIN)) |
| 55 | return 0; |
| 56 | |
| 57 | type = nft_compat_table_to_chaintype(tablename); |
| 58 | if (type < 0) |
| 59 | return -EINVAL; |
| 60 | |
| 61 | basechain = nft_base_chain(chain); |
| 62 | if (basechain->type->type != type) |
| 63 | return -EINVAL; |
| 64 | |
| 65 | return 0; |
| 66 | } |
| 67 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 68 | union nft_entry { |
| 69 | struct ipt_entry e4; |
| 70 | struct ip6t_entry e6; |
| 71 | }; |
| 72 | |
| 73 | static inline void |
| 74 | nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info) |
| 75 | { |
| 76 | par->target = xt; |
| 77 | par->targinfo = xt_info; |
| 78 | par->hotdrop = false; |
| 79 | } |
| 80 | |
| 81 | static void nft_target_eval(const struct nft_expr *expr, |
| 82 | struct nft_data data[NFT_REG_MAX + 1], |
| 83 | const struct nft_pktinfo *pkt) |
| 84 | { |
| 85 | void *info = nft_expr_priv(expr); |
| 86 | struct xt_target *target = expr->ops->data; |
| 87 | struct sk_buff *skb = pkt->skb; |
| 88 | int ret; |
| 89 | |
| 90 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info); |
| 91 | |
| 92 | ret = target->target(skb, &pkt->xt); |
| 93 | |
| 94 | if (pkt->xt.hotdrop) |
| 95 | ret = NF_DROP; |
| 96 | |
| 97 | switch(ret) { |
| 98 | case XT_CONTINUE: |
| 99 | data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; |
| 100 | break; |
| 101 | default: |
| 102 | data[NFT_REG_VERDICT].verdict = ret; |
| 103 | break; |
| 104 | } |
| 105 | return; |
| 106 | } |
| 107 | |
| 108 | static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = { |
| 109 | [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING }, |
| 110 | [NFTA_TARGET_REV] = { .type = NLA_U32 }, |
| 111 | [NFTA_TARGET_INFO] = { .type = NLA_BINARY }, |
| 112 | }; |
| 113 | |
| 114 | static void |
| 115 | nft_target_set_tgchk_param(struct xt_tgchk_param *par, |
| 116 | const struct nft_ctx *ctx, |
| 117 | struct xt_target *target, void *info, |
| 118 | union nft_entry *entry, u8 proto, bool inv) |
| 119 | { |
| 120 | par->net = &init_net; |
| 121 | par->table = ctx->table->name; |
| 122 | switch (ctx->afi->family) { |
| 123 | case AF_INET: |
| 124 | entry->e4.ip.proto = proto; |
| 125 | entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; |
| 126 | break; |
| 127 | case AF_INET6: |
| 128 | entry->e6.ipv6.proto = proto; |
| 129 | entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; |
| 130 | break; |
| 131 | } |
| 132 | par->entryinfo = entry; |
| 133 | par->target = target; |
| 134 | par->targinfo = info; |
| 135 | if (ctx->chain->flags & NFT_BASE_CHAIN) { |
| 136 | const struct nft_base_chain *basechain = |
| 137 | nft_base_chain(ctx->chain); |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 138 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 139 | |
| 140 | par->hook_mask = 1 << ops->hooknum; |
Pablo Neira Ayuso | 493618a | 2014-10-14 12:43:50 +0200 | [diff] [blame] | 141 | } else { |
| 142 | par->hook_mask = 0; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 143 | } |
| 144 | par->family = ctx->afi->family; |
| 145 | } |
| 146 | |
| 147 | static void target_compat_from_user(struct xt_target *t, void *in, void *out) |
| 148 | { |
Pablo Neira Ayuso | 756c1b1 | 2014-06-17 21:18:44 +0200 | [diff] [blame] | 149 | int pad; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 150 | |
Pablo Neira Ayuso | 756c1b1 | 2014-06-17 21:18:44 +0200 | [diff] [blame] | 151 | memcpy(out, in, t->targetsize); |
| 152 | pad = XT_ALIGN(t->targetsize) - t->targetsize; |
| 153 | if (pad > 0) |
| 154 | memset(out + t->targetsize, 0, pad); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 155 | } |
| 156 | |
| 157 | static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = { |
| 158 | [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 }, |
| 159 | [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 }, |
| 160 | }; |
| 161 | |
Pablo Neira Ayuso | 8691a9a | 2013-11-16 22:16:47 +0100 | [diff] [blame] | 162 | static int nft_parse_compat(const struct nlattr *attr, u8 *proto, bool *inv) |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 163 | { |
| 164 | struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1]; |
| 165 | u32 flags; |
| 166 | int err; |
| 167 | |
| 168 | err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr, |
| 169 | nft_rule_compat_policy); |
| 170 | if (err < 0) |
| 171 | return err; |
| 172 | |
| 173 | if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS]) |
| 174 | return -EINVAL; |
| 175 | |
| 176 | flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS])); |
| 177 | if (flags & ~NFT_RULE_COMPAT_F_MASK) |
| 178 | return -EINVAL; |
| 179 | if (flags & NFT_RULE_COMPAT_F_INV) |
| 180 | *inv = true; |
| 181 | |
Pablo Neira Ayuso | 8691a9a | 2013-11-16 22:16:47 +0100 | [diff] [blame] | 182 | *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO])); |
| 183 | return 0; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 184 | } |
| 185 | |
| 186 | static int |
| 187 | nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr, |
| 188 | const struct nlattr * const tb[]) |
| 189 | { |
| 190 | void *info = nft_expr_priv(expr); |
| 191 | struct xt_target *target = expr->ops->data; |
| 192 | struct xt_tgchk_param par; |
| 193 | size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO])); |
| 194 | u8 proto = 0; |
| 195 | bool inv = false; |
| 196 | union nft_entry e = {}; |
| 197 | int ret; |
| 198 | |
Pablo Neira Ayuso | f3f5dde | 2014-10-14 10:13:48 +0200 | [diff] [blame] | 199 | ret = nft_compat_chain_validate_dependency(target->table, ctx->chain); |
| 200 | if (ret < 0) |
| 201 | goto err; |
| 202 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 203 | target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info); |
| 204 | |
Pablo Neira Ayuso | 8691a9a | 2013-11-16 22:16:47 +0100 | [diff] [blame] | 205 | if (ctx->nla[NFTA_RULE_COMPAT]) { |
| 206 | ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); |
| 207 | if (ret < 0) |
| 208 | goto err; |
| 209 | } |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 210 | |
| 211 | nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv); |
| 212 | |
| 213 | ret = xt_check_target(&par, size, proto, inv); |
| 214 | if (ret < 0) |
| 215 | goto err; |
| 216 | |
| 217 | /* The standard target cannot be used */ |
| 218 | if (target->target == NULL) { |
| 219 | ret = -EINVAL; |
| 220 | goto err; |
| 221 | } |
| 222 | |
| 223 | return 0; |
| 224 | err: |
| 225 | module_put(target->me); |
| 226 | return ret; |
| 227 | } |
| 228 | |
| 229 | static void |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 230 | nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 231 | { |
| 232 | struct xt_target *target = expr->ops->data; |
Pablo Neira Ayuso | 3d9b142 | 2014-06-11 14:27:46 +0200 | [diff] [blame] | 233 | void *info = nft_expr_priv(expr); |
| 234 | struct xt_tgdtor_param par; |
| 235 | |
| 236 | par.net = ctx->net; |
| 237 | par.target = target; |
| 238 | par.targinfo = info; |
| 239 | par.family = ctx->afi->family; |
| 240 | if (par.target->destroy != NULL) |
| 241 | par.target->destroy(&par); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 242 | |
| 243 | module_put(target->me); |
| 244 | } |
| 245 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 246 | static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr) |
| 247 | { |
| 248 | const struct xt_target *target = expr->ops->data; |
| 249 | void *info = nft_expr_priv(expr); |
| 250 | |
| 251 | if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) || |
| 252 | nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) || |
Pablo Neira Ayuso | 756c1b1 | 2014-06-17 21:18:44 +0200 | [diff] [blame] | 253 | nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(target->targetsize), info)) |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 254 | goto nla_put_failure; |
| 255 | |
| 256 | return 0; |
| 257 | |
| 258 | nla_put_failure: |
| 259 | return -1; |
| 260 | } |
| 261 | |
| 262 | static int nft_target_validate(const struct nft_ctx *ctx, |
| 263 | const struct nft_expr *expr, |
| 264 | const struct nft_data **data) |
| 265 | { |
| 266 | struct xt_target *target = expr->ops->data; |
| 267 | unsigned int hook_mask = 0; |
Pablo Neira Ayuso | f3f5dde | 2014-10-14 10:13:48 +0200 | [diff] [blame] | 268 | int ret; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 269 | |
| 270 | if (ctx->chain->flags & NFT_BASE_CHAIN) { |
| 271 | const struct nft_base_chain *basechain = |
| 272 | nft_base_chain(ctx->chain); |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 273 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 274 | |
| 275 | hook_mask = 1 << ops->hooknum; |
Pablo Neira Ayuso | f3f5dde | 2014-10-14 10:13:48 +0200 | [diff] [blame] | 276 | if (!(hook_mask & target->hooks)) |
| 277 | return -EINVAL; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 278 | |
Pablo Neira Ayuso | f3f5dde | 2014-10-14 10:13:48 +0200 | [diff] [blame] | 279 | ret = nft_compat_chain_validate_dependency(target->table, |
| 280 | ctx->chain); |
| 281 | if (ret < 0) |
| 282 | return ret; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 283 | } |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static void nft_match_eval(const struct nft_expr *expr, |
| 288 | struct nft_data data[NFT_REG_MAX + 1], |
| 289 | const struct nft_pktinfo *pkt) |
| 290 | { |
| 291 | void *info = nft_expr_priv(expr); |
| 292 | struct xt_match *match = expr->ops->data; |
| 293 | struct sk_buff *skb = pkt->skb; |
| 294 | bool ret; |
| 295 | |
| 296 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info); |
| 297 | |
| 298 | ret = match->match(skb, (struct xt_action_param *)&pkt->xt); |
| 299 | |
| 300 | if (pkt->xt.hotdrop) { |
| 301 | data[NFT_REG_VERDICT].verdict = NF_DROP; |
| 302 | return; |
| 303 | } |
| 304 | |
| 305 | switch(ret) { |
| 306 | case true: |
| 307 | data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; |
| 308 | break; |
| 309 | case false: |
| 310 | data[NFT_REG_VERDICT].verdict = NFT_BREAK; |
| 311 | break; |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = { |
| 316 | [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING }, |
| 317 | [NFTA_MATCH_REV] = { .type = NLA_U32 }, |
| 318 | [NFTA_MATCH_INFO] = { .type = NLA_BINARY }, |
| 319 | }; |
| 320 | |
| 321 | /* struct xt_mtchk_param and xt_tgchk_param look very similar */ |
| 322 | static void |
| 323 | nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx, |
| 324 | struct xt_match *match, void *info, |
| 325 | union nft_entry *entry, u8 proto, bool inv) |
| 326 | { |
| 327 | par->net = &init_net; |
| 328 | par->table = ctx->table->name; |
| 329 | switch (ctx->afi->family) { |
| 330 | case AF_INET: |
| 331 | entry->e4.ip.proto = proto; |
| 332 | entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; |
| 333 | break; |
| 334 | case AF_INET6: |
| 335 | entry->e6.ipv6.proto = proto; |
| 336 | entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; |
| 337 | break; |
| 338 | } |
| 339 | par->entryinfo = entry; |
| 340 | par->match = match; |
| 341 | par->matchinfo = info; |
| 342 | if (ctx->chain->flags & NFT_BASE_CHAIN) { |
| 343 | const struct nft_base_chain *basechain = |
| 344 | nft_base_chain(ctx->chain); |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 345 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 346 | |
| 347 | par->hook_mask = 1 << ops->hooknum; |
Pablo Neira Ayuso | 493618a | 2014-10-14 12:43:50 +0200 | [diff] [blame] | 348 | } else { |
| 349 | par->hook_mask = 0; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 350 | } |
| 351 | par->family = ctx->afi->family; |
| 352 | } |
| 353 | |
| 354 | static void match_compat_from_user(struct xt_match *m, void *in, void *out) |
| 355 | { |
Pablo Neira Ayuso | 756c1b1 | 2014-06-17 21:18:44 +0200 | [diff] [blame] | 356 | int pad; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 357 | |
Pablo Neira Ayuso | 756c1b1 | 2014-06-17 21:18:44 +0200 | [diff] [blame] | 358 | memcpy(out, in, m->matchsize); |
| 359 | pad = XT_ALIGN(m->matchsize) - m->matchsize; |
| 360 | if (pad > 0) |
| 361 | memset(out + m->matchsize, 0, pad); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 362 | } |
| 363 | |
| 364 | static int |
| 365 | nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr, |
| 366 | const struct nlattr * const tb[]) |
| 367 | { |
| 368 | void *info = nft_expr_priv(expr); |
| 369 | struct xt_match *match = expr->ops->data; |
| 370 | struct xt_mtchk_param par; |
| 371 | size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO])); |
| 372 | u8 proto = 0; |
| 373 | bool inv = false; |
| 374 | union nft_entry e = {}; |
| 375 | int ret; |
| 376 | |
Pablo Neira Ayuso | f3f5dde | 2014-10-14 10:13:48 +0200 | [diff] [blame] | 377 | ret = nft_compat_chain_validate_dependency(match->name, ctx->chain); |
| 378 | if (ret < 0) |
| 379 | goto err; |
| 380 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 381 | match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info); |
| 382 | |
Pablo Neira Ayuso | 8691a9a | 2013-11-16 22:16:47 +0100 | [diff] [blame] | 383 | if (ctx->nla[NFTA_RULE_COMPAT]) { |
| 384 | ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); |
| 385 | if (ret < 0) |
| 386 | goto err; |
| 387 | } |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 388 | |
| 389 | nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv); |
| 390 | |
| 391 | ret = xt_check_match(&par, size, proto, inv); |
| 392 | if (ret < 0) |
| 393 | goto err; |
| 394 | |
| 395 | return 0; |
| 396 | err: |
| 397 | module_put(match->me); |
| 398 | return ret; |
| 399 | } |
| 400 | |
| 401 | static void |
Patrick McHardy | 62472bc | 2014-03-07 19:08:30 +0100 | [diff] [blame] | 402 | nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 403 | { |
| 404 | struct xt_match *match = expr->ops->data; |
Pablo Neira Ayuso | 3d9b142 | 2014-06-11 14:27:46 +0200 | [diff] [blame] | 405 | void *info = nft_expr_priv(expr); |
| 406 | struct xt_mtdtor_param par; |
| 407 | |
| 408 | par.net = ctx->net; |
| 409 | par.match = match; |
| 410 | par.matchinfo = info; |
| 411 | par.family = ctx->afi->family; |
| 412 | if (par.match->destroy != NULL) |
| 413 | par.match->destroy(&par); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 414 | |
| 415 | module_put(match->me); |
| 416 | } |
| 417 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 418 | static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr) |
| 419 | { |
| 420 | void *info = nft_expr_priv(expr); |
| 421 | struct xt_match *match = expr->ops->data; |
| 422 | |
| 423 | if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) || |
| 424 | nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) || |
Pablo Neira Ayuso | 756c1b1 | 2014-06-17 21:18:44 +0200 | [diff] [blame] | 425 | nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(match->matchsize), info)) |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 426 | goto nla_put_failure; |
| 427 | |
| 428 | return 0; |
| 429 | |
| 430 | nla_put_failure: |
| 431 | return -1; |
| 432 | } |
| 433 | |
| 434 | static int nft_match_validate(const struct nft_ctx *ctx, |
| 435 | const struct nft_expr *expr, |
| 436 | const struct nft_data **data) |
| 437 | { |
| 438 | struct xt_match *match = expr->ops->data; |
| 439 | unsigned int hook_mask = 0; |
Pablo Neira Ayuso | f3f5dde | 2014-10-14 10:13:48 +0200 | [diff] [blame] | 440 | int ret; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 441 | |
| 442 | if (ctx->chain->flags & NFT_BASE_CHAIN) { |
| 443 | const struct nft_base_chain *basechain = |
| 444 | nft_base_chain(ctx->chain); |
Patrick McHardy | 115a60b | 2014-01-03 12:16:15 +0000 | [diff] [blame] | 445 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 446 | |
| 447 | hook_mask = 1 << ops->hooknum; |
Pablo Neira Ayuso | f3f5dde | 2014-10-14 10:13:48 +0200 | [diff] [blame] | 448 | if (!(hook_mask & match->hooks)) |
| 449 | return -EINVAL; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 450 | |
Pablo Neira Ayuso | f3f5dde | 2014-10-14 10:13:48 +0200 | [diff] [blame] | 451 | ret = nft_compat_chain_validate_dependency(match->name, |
| 452 | ctx->chain); |
| 453 | if (ret < 0) |
| 454 | return ret; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 455 | } |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | static int |
| 460 | nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, |
| 461 | int event, u16 family, const char *name, |
| 462 | int rev, int target) |
| 463 | { |
| 464 | struct nlmsghdr *nlh; |
| 465 | struct nfgenmsg *nfmsg; |
| 466 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
| 467 | |
| 468 | event |= NFNL_SUBSYS_NFT_COMPAT << 8; |
| 469 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
| 470 | if (nlh == NULL) |
| 471 | goto nlmsg_failure; |
| 472 | |
| 473 | nfmsg = nlmsg_data(nlh); |
| 474 | nfmsg->nfgen_family = family; |
| 475 | nfmsg->version = NFNETLINK_V0; |
| 476 | nfmsg->res_id = 0; |
| 477 | |
| 478 | if (nla_put_string(skb, NFTA_COMPAT_NAME, name) || |
| 479 | nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) || |
| 480 | nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target))) |
| 481 | goto nla_put_failure; |
| 482 | |
| 483 | nlmsg_end(skb, nlh); |
| 484 | return skb->len; |
| 485 | |
| 486 | nlmsg_failure: |
| 487 | nla_put_failure: |
| 488 | nlmsg_cancel(skb, nlh); |
| 489 | return -1; |
| 490 | } |
| 491 | |
| 492 | static int |
| 493 | nfnl_compat_get(struct sock *nfnl, struct sk_buff *skb, |
| 494 | const struct nlmsghdr *nlh, const struct nlattr * const tb[]) |
| 495 | { |
| 496 | int ret = 0, target; |
| 497 | struct nfgenmsg *nfmsg; |
| 498 | const char *fmt; |
| 499 | const char *name; |
| 500 | u32 rev; |
| 501 | struct sk_buff *skb2; |
| 502 | |
| 503 | if (tb[NFTA_COMPAT_NAME] == NULL || |
| 504 | tb[NFTA_COMPAT_REV] == NULL || |
| 505 | tb[NFTA_COMPAT_TYPE] == NULL) |
| 506 | return -EINVAL; |
| 507 | |
| 508 | name = nla_data(tb[NFTA_COMPAT_NAME]); |
| 509 | rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV])); |
| 510 | target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE])); |
| 511 | |
| 512 | nfmsg = nlmsg_data(nlh); |
| 513 | |
| 514 | switch(nfmsg->nfgen_family) { |
| 515 | case AF_INET: |
| 516 | fmt = "ipt_%s"; |
| 517 | break; |
| 518 | case AF_INET6: |
| 519 | fmt = "ip6t_%s"; |
| 520 | break; |
| 521 | default: |
| 522 | pr_err("nft_compat: unsupported protocol %d\n", |
| 523 | nfmsg->nfgen_family); |
| 524 | return -EINVAL; |
| 525 | } |
| 526 | |
| 527 | try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name, |
| 528 | rev, target, &ret), |
| 529 | fmt, name); |
| 530 | |
| 531 | if (ret < 0) |
| 532 | return ret; |
| 533 | |
| 534 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 535 | if (skb2 == NULL) |
| 536 | return -ENOMEM; |
| 537 | |
| 538 | /* include the best revision for this extension in the message */ |
| 539 | if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid, |
| 540 | nlh->nlmsg_seq, |
| 541 | NFNL_MSG_TYPE(nlh->nlmsg_type), |
| 542 | NFNL_MSG_COMPAT_GET, |
| 543 | nfmsg->nfgen_family, |
| 544 | name, ret, target) <= 0) { |
| 545 | kfree_skb(skb2); |
| 546 | return -ENOSPC; |
| 547 | } |
| 548 | |
| 549 | ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, |
| 550 | MSG_DONTWAIT); |
| 551 | if (ret > 0) |
| 552 | ret = 0; |
| 553 | |
| 554 | return ret == -EAGAIN ? -ENOBUFS : ret; |
| 555 | } |
| 556 | |
| 557 | static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = { |
| 558 | [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING, |
| 559 | .len = NFT_COMPAT_NAME_MAX-1 }, |
| 560 | [NFTA_COMPAT_REV] = { .type = NLA_U32 }, |
| 561 | [NFTA_COMPAT_TYPE] = { .type = NLA_U32 }, |
| 562 | }; |
| 563 | |
| 564 | static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = { |
| 565 | [NFNL_MSG_COMPAT_GET] = { .call = nfnl_compat_get, |
| 566 | .attr_count = NFTA_COMPAT_MAX, |
| 567 | .policy = nfnl_compat_policy_get }, |
| 568 | }; |
| 569 | |
| 570 | static const struct nfnetlink_subsystem nfnl_compat_subsys = { |
| 571 | .name = "nft-compat", |
| 572 | .subsys_id = NFNL_SUBSYS_NFT_COMPAT, |
| 573 | .cb_count = NFNL_MSG_COMPAT_MAX, |
| 574 | .cb = nfnl_nft_compat_cb, |
| 575 | }; |
| 576 | |
| 577 | static LIST_HEAD(nft_match_list); |
| 578 | |
| 579 | struct nft_xt { |
| 580 | struct list_head head; |
| 581 | struct nft_expr_ops ops; |
| 582 | }; |
| 583 | |
| 584 | static struct nft_expr_type nft_match_type; |
| 585 | |
| 586 | static const struct nft_expr_ops * |
| 587 | nft_match_select_ops(const struct nft_ctx *ctx, |
| 588 | const struct nlattr * const tb[]) |
| 589 | { |
| 590 | struct nft_xt *nft_match; |
| 591 | struct xt_match *match; |
| 592 | char *mt_name; |
| 593 | __u32 rev, family; |
| 594 | |
| 595 | if (tb[NFTA_MATCH_NAME] == NULL || |
| 596 | tb[NFTA_MATCH_REV] == NULL || |
| 597 | tb[NFTA_MATCH_INFO] == NULL) |
| 598 | return ERR_PTR(-EINVAL); |
| 599 | |
| 600 | mt_name = nla_data(tb[NFTA_MATCH_NAME]); |
| 601 | rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV])); |
| 602 | family = ctx->afi->family; |
| 603 | |
| 604 | /* Re-use the existing match if it's already loaded. */ |
| 605 | list_for_each_entry(nft_match, &nft_match_list, head) { |
| 606 | struct xt_match *match = nft_match->ops.data; |
| 607 | |
| 608 | if (strcmp(match->name, mt_name) == 0 && |
| 609 | match->revision == rev && match->family == family) |
| 610 | return &nft_match->ops; |
| 611 | } |
| 612 | |
| 613 | match = xt_request_find_match(family, mt_name, rev); |
| 614 | if (IS_ERR(match)) |
| 615 | return ERR_PTR(-ENOENT); |
| 616 | |
| 617 | /* This is the first time we use this match, allocate operations */ |
| 618 | nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); |
| 619 | if (nft_match == NULL) |
| 620 | return ERR_PTR(-ENOMEM); |
| 621 | |
| 622 | nft_match->ops.type = &nft_match_type; |
Pablo Neira Ayuso | 756c1b1 | 2014-06-17 21:18:44 +0200 | [diff] [blame] | 623 | nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize)); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 624 | nft_match->ops.eval = nft_match_eval; |
| 625 | nft_match->ops.init = nft_match_init; |
| 626 | nft_match->ops.destroy = nft_match_destroy; |
| 627 | nft_match->ops.dump = nft_match_dump; |
| 628 | nft_match->ops.validate = nft_match_validate; |
| 629 | nft_match->ops.data = match; |
| 630 | |
| 631 | list_add(&nft_match->head, &nft_match_list); |
| 632 | |
| 633 | return &nft_match->ops; |
| 634 | } |
| 635 | |
| 636 | static void nft_match_release(void) |
| 637 | { |
Dan Carpenter | c359c41 | 2013-11-04 15:58:56 +0300 | [diff] [blame] | 638 | struct nft_xt *nft_match, *tmp; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 639 | |
Dan Carpenter | c359c41 | 2013-11-04 15:58:56 +0300 | [diff] [blame] | 640 | list_for_each_entry_safe(nft_match, tmp, &nft_match_list, head) |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 641 | kfree(nft_match); |
| 642 | } |
| 643 | |
| 644 | static struct nft_expr_type nft_match_type __read_mostly = { |
| 645 | .name = "match", |
| 646 | .select_ops = nft_match_select_ops, |
| 647 | .policy = nft_match_policy, |
| 648 | .maxattr = NFTA_MATCH_MAX, |
| 649 | .owner = THIS_MODULE, |
| 650 | }; |
| 651 | |
| 652 | static LIST_HEAD(nft_target_list); |
| 653 | |
| 654 | static struct nft_expr_type nft_target_type; |
| 655 | |
| 656 | static const struct nft_expr_ops * |
| 657 | nft_target_select_ops(const struct nft_ctx *ctx, |
| 658 | const struct nlattr * const tb[]) |
| 659 | { |
| 660 | struct nft_xt *nft_target; |
| 661 | struct xt_target *target; |
| 662 | char *tg_name; |
| 663 | __u32 rev, family; |
| 664 | |
| 665 | if (tb[NFTA_TARGET_NAME] == NULL || |
| 666 | tb[NFTA_TARGET_REV] == NULL || |
| 667 | tb[NFTA_TARGET_INFO] == NULL) |
| 668 | return ERR_PTR(-EINVAL); |
| 669 | |
| 670 | tg_name = nla_data(tb[NFTA_TARGET_NAME]); |
| 671 | rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV])); |
| 672 | family = ctx->afi->family; |
| 673 | |
| 674 | /* Re-use the existing target if it's already loaded. */ |
Arturo Borrero | 7965ee9 | 2014-10-26 12:22:40 +0100 | [diff] [blame^] | 675 | list_for_each_entry(nft_target, &nft_target_list, head) { |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 676 | struct xt_target *target = nft_target->ops.data; |
| 677 | |
| 678 | if (strcmp(target->name, tg_name) == 0 && |
| 679 | target->revision == rev && target->family == family) |
| 680 | return &nft_target->ops; |
| 681 | } |
| 682 | |
| 683 | target = xt_request_find_target(family, tg_name, rev); |
| 684 | if (IS_ERR(target)) |
| 685 | return ERR_PTR(-ENOENT); |
| 686 | |
| 687 | /* This is the first time we use this target, allocate operations */ |
| 688 | nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); |
| 689 | if (nft_target == NULL) |
| 690 | return ERR_PTR(-ENOMEM); |
| 691 | |
| 692 | nft_target->ops.type = &nft_target_type; |
Pablo Neira Ayuso | 756c1b1 | 2014-06-17 21:18:44 +0200 | [diff] [blame] | 693 | nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize)); |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 694 | nft_target->ops.eval = nft_target_eval; |
| 695 | nft_target->ops.init = nft_target_init; |
| 696 | nft_target->ops.destroy = nft_target_destroy; |
| 697 | nft_target->ops.dump = nft_target_dump; |
| 698 | nft_target->ops.validate = nft_target_validate; |
| 699 | nft_target->ops.data = target; |
| 700 | |
| 701 | list_add(&nft_target->head, &nft_target_list); |
| 702 | |
| 703 | return &nft_target->ops; |
| 704 | } |
| 705 | |
| 706 | static void nft_target_release(void) |
| 707 | { |
Dan Carpenter | c359c41 | 2013-11-04 15:58:56 +0300 | [diff] [blame] | 708 | struct nft_xt *nft_target, *tmp; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 709 | |
Dan Carpenter | c359c41 | 2013-11-04 15:58:56 +0300 | [diff] [blame] | 710 | list_for_each_entry_safe(nft_target, tmp, &nft_target_list, head) |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 711 | kfree(nft_target); |
| 712 | } |
| 713 | |
| 714 | static struct nft_expr_type nft_target_type __read_mostly = { |
| 715 | .name = "target", |
| 716 | .select_ops = nft_target_select_ops, |
| 717 | .policy = nft_target_policy, |
| 718 | .maxattr = NFTA_TARGET_MAX, |
| 719 | .owner = THIS_MODULE, |
| 720 | }; |
| 721 | |
| 722 | static int __init nft_compat_module_init(void) |
| 723 | { |
| 724 | int ret; |
| 725 | |
| 726 | ret = nft_register_expr(&nft_match_type); |
| 727 | if (ret < 0) |
| 728 | return ret; |
| 729 | |
| 730 | ret = nft_register_expr(&nft_target_type); |
| 731 | if (ret < 0) |
| 732 | goto err_match; |
| 733 | |
| 734 | ret = nfnetlink_subsys_register(&nfnl_compat_subsys); |
| 735 | if (ret < 0) { |
| 736 | pr_err("nft_compat: cannot register with nfnetlink.\n"); |
| 737 | goto err_target; |
| 738 | } |
| 739 | |
| 740 | pr_info("nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n"); |
| 741 | |
| 742 | return ret; |
| 743 | |
| 744 | err_target: |
| 745 | nft_unregister_expr(&nft_target_type); |
| 746 | err_match: |
| 747 | nft_unregister_expr(&nft_match_type); |
| 748 | return ret; |
| 749 | } |
| 750 | |
| 751 | static void __exit nft_compat_module_exit(void) |
| 752 | { |
| 753 | nfnetlink_subsys_unregister(&nfnl_compat_subsys); |
| 754 | nft_unregister_expr(&nft_target_type); |
| 755 | nft_unregister_expr(&nft_match_type); |
| 756 | nft_match_release(); |
| 757 | nft_target_release(); |
| 758 | } |
| 759 | |
| 760 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT); |
| 761 | |
| 762 | module_init(nft_compat_module_init); |
| 763 | module_exit(nft_compat_module_exit); |
| 764 | |
| 765 | MODULE_LICENSE("GPL"); |
| 766 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |
| 767 | MODULE_ALIAS_NFT_EXPR("match"); |
| 768 | MODULE_ALIAS_NFT_EXPR("target"); |