[PATCH nf,v2] netfilter: nft_dup: validate family and chains

[PATCH nf,v2] netfilter: nft_dup: validate family and chains

[Pablo Neira Ayuso]

This only supports for netdev family and ingress and egress hooks.

Fixes: 502061f81d3e ("netfilter: nf_tables: add packet duplication to the netdev family")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
v2: family is already validated via .family field in expression type

 net/netfilter/nft_dup_netdev.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/net/netfilter/nft_dup_netdev.c b/net/netfilter/nft_dup_netdev.c
index 63507402716d..1d5bbe8d2660 100644
--- a/net/netfilter/nft_dup_netdev.c
+++ b/net/netfilter/nft_dup_netdev.c
@@ -44,6 +44,14 @@ static int nft_dup_netdev_init(const struct nft_ctx *ctx,
 				       sizeof(int));
 }
 
+static int nft_dup_netdev_validate(const struct nft_ctx *ctx,
+				   const struct nft_expr *expr,
+				   const struct nft_data **data)
+{
+	return nft_chain_validate_hooks(ctx->chain, (1 << NF_NETDEV_INGRESS) |
+						    (1 << NF_NETDEV_EGRESS));
+}
+
 static int nft_dup_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr)
 {
 	struct nft_dup_netdev *priv = nft_expr_priv(expr);
@@ -79,6 +87,7 @@ static const struct nft_expr_ops nft_dup_netdev_ops = {
 	.eval		= nft_dup_netdev_eval,
 	.init		= nft_dup_netdev_init,
 	.dump		= nft_dup_netdev_dump,
+	.validate	= nft_dup_netdev_validate,
 	.reduce		= NFT_REDUCE_READONLY,
 	.offload	= nft_dup_netdev_offload,
 	.offload_action	= nft_dup_netdev_offload_action,
-- 
2.30.2