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netfilter: nft_compat: reject unused compat flag

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Flag (1 << 0) is ignored is set, never used, reject it it with EINVAL
instead.

Fixes: 0ca743a559 ("netfilter: nf_tables: add compatibility layer for x_tables")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2024-02-01 23:33:29 +01:00
parent 36fa8d6971
commit 292781c3c5
2 changed files with 4 additions and 1 deletions
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2
include/uapi/linux/netfilter/nf_tables.h
View file

@ -285,9 +285,11 @@ enum nft_rule_attributes {
/**
* enum nft_rule_compat_flags - nf_tables rule compat flags
*
* @NFT_RULE_COMPAT_F_UNUSED: unused
* @NFT_RULE_COMPAT_F_INV: invert the check result
*/
enum nft_rule_compat_flags {
NFT_RULE_COMPAT_F_UNUSED = (1 << 0),
NFT_RULE_COMPAT_F_INV = (1 << 1),
NFT_RULE_COMPAT_F_MASK = NFT_RULE_COMPAT_F_INV,
};

3
net/netfilter/nft_compat.c
View file

@ -212,7 +212,8 @@ static int nft_parse_compat(const struct nlattr *attr, u16 *proto, bool *inv)
return -EINVAL;
flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS]));
if (flags & ~NFT_RULE_COMPAT_F_MASK)
if (flags & NFT_RULE_COMPAT_F_UNUSED ||
flags & ~NFT_RULE_COMPAT_F_MASK)
return -EINVAL;
if (flags & NFT_RULE_COMPAT_F_INV)
*inv = true;