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netfilter: nftables: extend error reporting for chain updates

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The initial support for netlink extended ACK is missing the chain update
path, which results in misleading error reporting in case of EEXIST.

Fixes 36dd1bcc07 ("netfilter: nf_tables: initial support for extended ACK reporting")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2020-10-12 16:54:30 +02:00
parent 7980d2eabd
commit 98a381a7d4
1 changed files with 14 additions and 5 deletions
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19
net/netfilter/nf_tables_api.c
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@ -2103,7 +2103,8 @@ static bool nft_hook_list_equal(struct list_head *hook_list1,
}
static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
u32 flags)
u32 flags, const struct nlattr *attr,
struct netlink_ext_ack *extack)
{
const struct nlattr * const *nla = ctx->nla;
struct nft_table *table = ctx->table;
@ -2119,9 +2120,10 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
return -EOPNOTSUPP;
if (nla[NFTA_CHAIN_HOOK]) {
if (!nft_is_base_chain(chain))
if (!nft_is_base_chain(chain)) {
NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
false);
if (err < 0)
@ -2130,6 +2132,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
basechain = nft_base_chain(chain);
if (basechain->type != hook.type) {
nft_chain_release_hook(&hook);
NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
@ -2137,6 +2140,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
if (!nft_hook_list_equal(&basechain->hook_list,
&hook.list)) {
nft_chain_release_hook(&hook);
NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
} else {
@ -2144,6 +2148,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
if (ops->hooknum != hook.num ||
ops->priority != hook.priority) {
nft_chain_release_hook(&hook);
NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
}
@ -2156,8 +2161,10 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
chain2 = nft_chain_lookup(ctx->net, table,
nla[NFTA_CHAIN_NAME], genmask);
if (!IS_ERR(chain2))
if (!IS_ERR(chain2)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
return -EEXIST;
}
}
if (nla[NFTA_CHAIN_COUNTERS]) {
@ -2200,6 +2207,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
nft_trans_chain_update(tmp) &&
nft_trans_chain_name(tmp) &&
strcmp(name, nft_trans_chain_name(tmp)) == 0) {
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
kfree(name);
goto err;
}
@ -2322,7 +2330,8 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk,
return -EOPNOTSUPP;
flags |= chain->flags & NFT_CHAIN_BASE;
return nf_tables_updchain(&ctx, genmask, policy, flags);
return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
extack);
}
return nf_tables_addchain(&ctx, family, genmask, policy, flags);