[PATCH -stable,4.19.x 29/40] netfilter: nft_dynset: report EOPNOTSUPP on missing set feature

Pablo Neira Ayuso
2024-06-13T01:02:37Z

commit 95cd4bca7b1f4a25810f3ddfc5e767fb46931789 upstream.

If userspace requests a feature which is not available the original set
definition, then bail out with EOPNOTSUPP. If userspace sends
unsupported dynset flags (new feature not supported by this kernel),
then report EOPNOTSUPP to userspace. EINVAL should be only used to
report malformed netlink messages from userspace.

Fixes: 22fe54d5fefc ("netfilter: nf_tables: add support for dynamic set updates")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/netfilter/nft_dynset.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c
index 7f79e877671b..04ca3afe70dc 100644
--- a/net/netfilter/nft_dynset.c
+++ b/net/netfilter/nft_dynset.c
@@ -133,7 +133,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS]));

if (flags & ~NFT_DYNSET_F_INV)
- return -EINVAL;
+ return -EOPNOTSUPP;
if (flags & NFT_DYNSET_F_INV)
priv->invert = true;
}
@@ -168,7 +168,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
timeout = 0;
if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
if (!(set->flags & NFT_SET_TIMEOUT))
- return -EINVAL;
+ return -EOPNOTSUPP;

err = nf_msecs_to_jiffies64(tb[NFTA_DYNSET_TIMEOUT], &timeout);
if (err)
@@ -182,7 +182,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,

if (tb[NFTA_DYNSET_SREG_DATA] != NULL) {
if (!(set->flags & NFT_SET_MAP))
- return -EINVAL;
+ return -EOPNOTSUPP;
if (set->dtype == NFT_DATA_VERDICT)
return -EOPNOTSUPP;

--
2.30.2