Commit c1f79a2e authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso
Browse files

netfilter: nf_tables: reject unsupported chain flags 



Bail out if userspace sends unsupported chain flags.

Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent d0e2c7de

include/uapi/linux/netfilter/nf_tables.h

+3 −0
Original line number Diff line number Diff line
@@ -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

net/netfilter/nf_tables_api.c

+3 −0
Original line number Diff line number Diff line
@@ -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) {

CRA Git | Maintained and supported by SUSTech CRA and CCSE