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netfilter: nf_tables: reject destroy command to remove basechain hooks

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Report EOPNOTSUPP if NFT_MSG_DESTROYCHAIN is used to delete hooks in an
existing netdev basechain, thus, only NFT_MSG_DELCHAIN is allowed.

Fixes: 7d937b1071 ("netfilter: nf_tables: support for deleting devices in an existing netdev chain")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2024-03-21 01:27:50 +01:00
parent d24b03535e
commit b32ca27fa2
1 changed files with 2 additions and 1 deletions
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3
net/netfilter/nf_tables_api.c
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@ -2944,7 +2944,8 @@ static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
if (nla[NFTA_CHAIN_HOOK]) {
if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN ||
chain->flags & NFT_CHAIN_HW_OFFLOAD)
return -EOPNOTSUPP;
if (nft_is_base_chain(chain)) {