netfilter: nft_payload: add VLAN offload support
Match on ethertype and set up protocol dependency. Check for protocol
dependency before accessing the tci field. Allow to match on the
encapsulated ethertype too.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/nft_payload.c b/net/netfilter/nft_payload.c
index 0877d46..f17939f 100644
--- a/net/netfilter/nft_payload.c
+++ b/net/netfilter/nft_payload.c
@@ -182,6 +182,28 @@ static int nft_payload_offload_ll(struct nft_offload_ctx *ctx,
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_ETH_ADDRS, eth_addrs,
dst, ETH_ALEN, reg);
break;
+ case offsetof(struct ethhdr, h_proto):
+ if (priv->len != sizeof(__be16))
+ return -EOPNOTSUPP;
+
+ NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic,
+ n_proto, sizeof(__be16), reg);
+ nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
+ break;
+ case offsetof(struct vlan_ethhdr, h_vlan_TCI):
+ if (priv->len != sizeof(__be16))
+ return -EOPNOTSUPP;
+
+ NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_VLAN, vlan,
+ vlan_tci, sizeof(__be16), reg);
+ break;
+ case offsetof(struct vlan_ethhdr, h_vlan_encapsulated_proto):
+ if (priv->len != sizeof(__be16))
+ return -EOPNOTSUPP;
+
+ NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_VLAN, vlan,
+ vlan_tpid, sizeof(__be16), reg);
+ break;
default:
return -EOPNOTSUPP;
}
