diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c index 44ae273b43917cfdc2b510ee5828f3695fd82833..0480f57a4eb6c62da5b02951e51db77d4af3e0b4 100644 --- a/net/netfilter/nft_compat.c +++ b/net/netfilter/nft_compat.c @@ -19,9 +19,52 @@ #include #include #include -#include /* for set_fs */ #include +static const struct { + const char *name; + u8 type; +} table_to_chaintype[] = { + { "filter", NFT_CHAIN_T_DEFAULT }, + { "raw", NFT_CHAIN_T_DEFAULT }, + { "security", NFT_CHAIN_T_DEFAULT }, + { "mangle", NFT_CHAIN_T_ROUTE }, + { "nat", NFT_CHAIN_T_NAT }, + { }, +}; + +static int nft_compat_table_to_chaintype(const char *table) +{ + int i; + + for (i = 0; table_to_chaintype[i].name != NULL; i++) { + if (strcmp(table_to_chaintype[i].name, table) == 0) + return table_to_chaintype[i].type; + } + + return -1; +} + +static int nft_compat_chain_validate_dependency(const char *tablename, + const struct nft_chain *chain) +{ + enum nft_chain_type type; + const struct nft_base_chain *basechain; + + if (!tablename || !(chain->flags & NFT_BASE_CHAIN)) + return 0; + + type = nft_compat_table_to_chaintype(tablename); + if (type < 0) + return -EINVAL; + + basechain = nft_base_chain(chain); + if (basechain->type->type != type) + return -EINVAL; + + return 0; +} + union nft_entry { struct ipt_entry e4; struct ip6t_entry e6; @@ -153,6 +196,10 @@ nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr, union nft_entry e = {}; int ret; + ret = nft_compat_chain_validate_dependency(target->table, ctx->chain); + if (ret < 0) + goto err; + target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info); if (ctx->nla[NFTA_RULE_COMPAT]) { @@ -218,6 +265,7 @@ static int nft_target_validate(const struct nft_ctx *ctx, { struct xt_target *target = expr->ops->data; unsigned int hook_mask = 0; + int ret; if (ctx->chain->flags & NFT_BASE_CHAIN) { const struct nft_base_chain *basechain = @@ -225,11 +273,13 @@ static int nft_target_validate(const struct nft_ctx *ctx, const struct nf_hook_ops *ops = &basechain->ops[0]; hook_mask = 1 << ops->hooknum; - if (hook_mask & target->hooks) - return 0; + if (!(hook_mask & target->hooks)) + return -EINVAL; - /* This target is being called from an invalid chain */ - return -EINVAL; + ret = nft_compat_chain_validate_dependency(target->table, + ctx->chain); + if (ret < 0) + return ret; } return 0; } @@ -324,6 +374,10 @@ nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr, union nft_entry e = {}; int ret; + ret = nft_compat_chain_validate_dependency(match->name, ctx->chain); + if (ret < 0) + goto err; + match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info); if (ctx->nla[NFTA_RULE_COMPAT]) { @@ -383,6 +437,7 @@ static int nft_match_validate(const struct nft_ctx *ctx, { struct xt_match *match = expr->ops->data; unsigned int hook_mask = 0; + int ret; if (ctx->chain->flags & NFT_BASE_CHAIN) { const struct nft_base_chain *basechain = @@ -390,11 +445,13 @@ static int nft_match_validate(const struct nft_ctx *ctx, const struct nf_hook_ops *ops = &basechain->ops[0]; hook_mask = 1 << ops->hooknum; - if (hook_mask & match->hooks) - return 0; + if (!(hook_mask & match->hooks)) + return -EINVAL; - /* This match is being called from an invalid chain */ - return -EINVAL; + ret = nft_compat_chain_validate_dependency(match->name, + ctx->chain); + if (ret < 0) + return ret; } return 0; }