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netfilter: nft_payload: add VLAN offload support

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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>
This commit is contained in:
Pablo Neira Ayuso 2019-11-19 23:05:54 +01:00 committed by David S. Miller
parent 8819efc943
commit a82055af59
2 changed files with 28 additions and 3 deletions
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3
include/net/flow_dissector.h
View File

@ -48,9 +48,12 @@ struct flow_dissector_key_tags {
};
struct flow_dissector_key_vlan {
union {
u16 vlan_id:12,
vlan_dei:1,
vlan_priority:3;
__be16 vlan_tci;
};
__be16 vlan_tpid;
};

22
net/netfilter/nft_payload.c
View File

@ -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;
}