netfilter: nft_meta_bridge: Add NFT_META_BRI_IIFVPROTO support

This patch allows you to match on bridge vlan protocol, eg.

nft add rule bridge firewall zones counter meta ibrvproto 0x8100

Signed-off-by: wenxu <wenxu@ucloud.cn>
Reviewed-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 8747492..0e3462d 100644 (file)
--- 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_IIFPVID: packet input bridge port pvid
+ * @NFT_META_BRI_IIFVPROTO: 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_IIFPVID,
+       NFT_META_BRI_IIFVPROTO,
 };
 
 /**

diff --git a/net/bridge/netfilter/nft_meta_bridge.c b/net/bridge/netfilter/nft_meta_bridge.c
index 9487d42..bed66f5 100644 (file)
--- a/net/bridge/netfilter/nft_meta_bridge.c
+++ b/net/bridge/netfilter/nft_meta_bridge.c
@@ -49,6 +49,17 @@ static void nft_meta_bridge_get_eval(const struct nft_expr *expr,
                nft_reg_store16(dest, p_pvid);
                return;
        }
+       case NFT_META_BRI_IIFVPROTO: {
+               u16 p_proto;
+
+               br_dev = nft_meta_get_bridge(in);
+               if (!br_dev || !br_vlan_enabled(br_dev))
+                       goto err;
+
+               br_vlan_get_proto(br_dev, &p_proto);
+               nft_reg_store16(dest, p_proto);
+               return;
+       }
        default:
                goto out;
        }
@@ -75,6 +86,7 @@ static int nft_meta_bridge_get_init(const struct nft_ctx *ctx,
                len = IFNAMSIZ;
                break;
        case NFT_META_BRI_IIFPVID:
+       case NFT_META_BRI_IIFVPROTO:
                len = sizeof(u16);
                break;
        default: