[PATCH 1/2 nf-next] netfilter: nft_meta: add NFT_META_BRI_VLAN_PROTO support

[wenxu@ucloud.cn]

From: wenxu <wenxu@ucloud.cn>

This patch provide a meta to get the bridge vlan proto

nft add rule bridge firewall zones counter meta br_vlan_proto 0x8100

Signed-off-by: wenxu <wenxu@ucloud.cn>
---
 include/uapi/linux/netfilter/nf_tables.h | 2 ++
 net/netfilter/nft_meta.c                 | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 8859535..0b18646 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -796,6 +796,7 @@ enum nft_exthdr_attributes {
  * @NFT_META_IIFKIND: packet input interface kind name (dev->rtnl_link_ops->kind)
  * @NFT_META_OIFKIND: packet output interface kind name (dev->rtnl_link_ops->kind)
  * @NFT_META_BRI_PVID: packet input bridge port pvid
+ * @NFT_META_BRI_VLAN_PROTO: packet input bridge vlan proto
  */
 enum nft_meta_keys {
 	NFT_META_LEN,
@@ -827,6 +828,7 @@ enum nft_meta_keys {
 	NFT_META_IIFKIND,
 	NFT_META_OIFKIND,
 	NFT_META_BRI_PVID,
+	NFT_META_BRI_VLAN_PROTO,
 };
 
 /**
diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c
index 4f8116d..e3adf6a 100644
--- a/net/netfilter/nft_meta.c
+++ b/net/netfilter/nft_meta.c
@@ -248,6 +248,14 @@ void nft_meta_get_eval(const struct nft_expr *expr,
 			return;
 		}
 		goto err;
+	case NFT_META_BRI_VLAN_PROTO:
+		if (in == NULL || (p = br_port_get_rtnl_rcu(in)) == NULL)
+			goto err;
+		if (br_opt_get(p->br, BROPT_VLAN_ENABLED)) {
+			nft_reg_store16(dest, p->br->vlan_proto);
+			return;
+		}
+		goto err;
 #endif
 	case NFT_META_IIFKIND:
 		if (in == NULL || in->rtnl_link_ops == NULL)
@@ -376,6 +384,7 @@ static int nft_meta_get_init(const struct nft_ctx *ctx,
 		len = IFNAMSIZ;
 		break;
 	case NFT_META_BRI_PVID:
+	case NFT_META_BRI_VLAN_PROTO:
 		if (ctx->family != NFPROTO_BRIDGE)
 			return -EOPNOTSUPP;
 		len = sizeof(u16);
-- 
1.8.3.1