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netfilter: nf_tables: reject unsupported chain flags 

Bail out if userspace sends unsupported chain flags.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2020-07-04 02:51:28 +02:00
parent d0e2c7de92
commit c1f79a2eef
2 changed files with 6 additions and 0 deletions
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3
include/uapi/linux/netfilter/nf_tables.h
View File

@ -189,6 +189,9 @@ enum nft_chain_flags {
NFT_CHAIN_HW_OFFLOAD = (1 << 1),
NFT_CHAIN_BINDING = (1 << 2),
};
#define NFT_CHAIN_FLAGS (NFT_CHAIN_BASE | \
NFT_CHAIN_HW_OFFLOAD | \
NFT_CHAIN_BINDING)
/**
* enum nft_chain_attributes - nf_tables chain netlink attributes

3
net/netfilter/nf_tables_api.c
View File

@ -2285,6 +2285,9 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk,
else if (chain)
flags = chain->flags;
if (flags & ~NFT_CHAIN_FLAGS)
return -EOPNOTSUPP;
nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
if (chain != NULL) {