netdev - [PATCH 1/2 nf-next v2] netfilter: nft_meta: add NFT_META_BRI

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Message-Id: <1561640835-4507-1-git-send-email-wenxu@ucloud.cn>
Date:   Thu, 27 Jun 2019 21:07:14 +0800
From:   wenxu@...oud.cn
To:     pablo@...filter.org, fw@...len.de
Cc:     netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 1/2 nf-next v2] netfilter: nft_meta: add NFT_META_BRI_O/IIFVPROTO support

From: wenxu <wenxu@...oud.cn>

This patch provide a meta to get the bridge vlan proto

nft add rule bridge firewall zones counter meta br_iifvproto 0x8100

Signed-off-by: wenxu <wenxu@...oud.cn>
---
 include/uapi/linux/netfilter/nf_tables.h |  4 ++++
 net/netfilter/nft_meta.c                 | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 8859535..0f75a6d 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -796,6 +796,8 @@ 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_IIFVPROTO: packet input bridge port vlan proto
+ * @NFT_META_BRI_OIFVPROTO: packet output bridge port vlan proto
  */
 enum nft_meta_keys {
 	NFT_META_LEN,
@@ -827,6 +829,8 @@ enum nft_meta_keys {
 	NFT_META_IIFKIND,
 	NFT_META_OIFKIND,
 	NFT_META_BRI_PVID,
+	NFT_META_BRI_IIFVPROTO,
+	NFT_META_BRI_OIFVPROTO,
 };
 
 /**
diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c
index 4f8116d..e7e10fb 100644
--- a/net/netfilter/nft_meta.c
+++ b/net/netfilter/nft_meta.c
@@ -248,6 +248,22 @@ void nft_meta_get_eval(const struct nft_expr *expr,
 			return;
 		}
 		goto err;
+	case NFT_META_BRI_IIFVPROTO:
+		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;
+	case NFT_META_BRI_OIFVPROTO:
+		if (out == NULL || (p = br_port_get_rtnl_rcu(out)) == 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 +392,8 @@ static int nft_meta_get_init(const struct nft_ctx *ctx,
 		len = IFNAMSIZ;
 		break;
 	case NFT_META_BRI_PVID:
+	case NFT_META_BRI_IIFVPROTO:
+	case NFT_META_BRI_OIFVPROTO:
 		if (ctx->family != NFPROTO_BRIDGE)
 			return -EOPNOTSUPP;
 		len = sizeof(u16);
-- 
1.8.3.1