[PATCH] netfilter: nft_meta: fix bridge port vlan ID selector

[Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>]

Use br_vlan_enabled() and br_vlan_get_pvid() helpers as Nikolay
suggests.

Rename NFT_META_BRI_PVID to NFT_META_BRI_IIFPVID before this patch hits
the 5.3 release cycle, to leave room for matching for the output bridge
port in the future.

Reported-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx>
Fixes: da4f10a4265b ("netfilter: nft_meta: add NFT_META_BRI_PVID support")
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
 include/uapi/linux/netfilter/nf_tables.h |  4 ++--
 net/netfilter/nft_meta.c                 | 17 ++++++++++-------
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 8859535031e2..8a1bd0b1ec8c 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -795,7 +795,7 @@ enum nft_exthdr_attributes {
  * @NFT_META_SECPATH: boolean, secpath_exists (!!skb->sp)
  * @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_IIFPVID: packet input bridge port pvid
  */
 enum nft_meta_keys {
 	NFT_META_LEN,
@@ -826,7 +826,7 @@ enum nft_meta_keys {
 	NFT_META_SECPATH,
 	NFT_META_IIFKIND,
 	NFT_META_OIFKIND,
-	NFT_META_BRI_PVID,
+	NFT_META_BRI_IIFPVID,
 };
 
 /**
diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c
index 4f8116de70f8..b8d8adc0852e 100644
--- a/net/netfilter/nft_meta.c
+++ b/net/netfilter/nft_meta.c
@@ -240,14 +240,17 @@ void nft_meta_get_eval(const struct nft_expr *expr,
 			goto err;
 		strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
 		return;
-	case NFT_META_BRI_PVID:
+	case NFT_META_BRI_IIFPVID: {
+		u16 p_pvid;
+
 		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, br_get_pvid(nbp_vlan_group_rcu(p)));
-			return;
-		}
-		goto err;
+		if (!br_vlan_enabled(in))
+			goto err;
+		br_vlan_get_pvid(in, &p_pvid);
+		nft_reg_store16(dest, p_pvid);
+		return;
+	}
 #endif
 	case NFT_META_IIFKIND:
 		if (in == NULL || in->rtnl_link_ops == NULL)
@@ -375,7 +378,7 @@ static int nft_meta_get_init(const struct nft_ctx *ctx,
 			return -EOPNOTSUPP;
 		len = IFNAMSIZ;
 		break;
-	case NFT_META_BRI_PVID:
+	case NFT_META_BRI_IIFPVID:
 		if (ctx->family != NFPROTO_BRIDGE)
 			return -EOPNOTSUPP;
 		len = sizeof(u16);
-- 
2.11.0