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netfilter: nft_payload: add C-VLAN offload support

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Match on h_vlan_encapsulated_proto 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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Pablo Neira Ayuso authored and David S. Miller committed 2019-11-20 11:21:34 -08:00
1 parent a82055af59
commit 89d8fd44ab
1 file changed
+16
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net/netfilter/nft_payload.c
+16
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@@ -203,6 +203,22 @@ static int nft_payload_offload_ll(struct nft_offload_ctx *ctx,
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_VLAN, vlan,
vlan_tpid, sizeof(__be16), reg);
nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
break;
case offsetof(struct vlan_ethhdr, h_vlan_TCI) + sizeof(struct vlan_hdr):
if (priv->len != sizeof(__be16))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_CVLAN, vlan,
vlan_tci, sizeof(__be16), reg);
break;
case offsetof(struct vlan_ethhdr, h_vlan_encapsulated_proto) +
sizeof(struct vlan_hdr):
if (priv->len != sizeof(__be16))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_CVLAN, vlan,
vlan_tpid, sizeof(__be16), reg);
break;
default:
return -EOPNOTSUPP;