linux-kernel - [PATCH 5.4 121/142] netfilter: nft_reject_bridge: enable reject with bridge vlan

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Message-Id: <20200601174050.333572615@linuxfoundation.org>
Date:   Mon,  1 Jun 2020 19:54:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Michael Braun <michael-dev@...i-braun.de>,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH 5.4 121/142] netfilter: nft_reject_bridge: enable reject with bridge vlan

From: Michael Braun <michael-dev@...i-braun.de>

commit e9c284ec4b41c827f4369973d2792992849e4fa5 upstream.

Currently, using the bridge reject target with tagged packets
results in untagged packets being sent back.

Fix this by mirroring the vlan id as well.

Fixes: 85f5b3086a04 ("netfilter: bridge: add reject support")
Signed-off-by: Michael Braun <michael-dev@...i-braun.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/bridge/netfilter/nft_reject_bridge.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/net/bridge/netfilter/nft_reject_bridge.c
+++ b/net/bridge/netfilter/nft_reject_bridge.c
@@ -31,6 +31,12 @@ static void nft_reject_br_push_etherhdr(
 	ether_addr_copy(eth->h_dest, eth_hdr(oldskb)->h_source);
 	eth->h_proto = eth_hdr(oldskb)->h_proto;
 	skb_pull(nskb, ETH_HLEN);
+
+	if (skb_vlan_tag_present(oldskb)) {
+		u16 vid = skb_vlan_tag_get(oldskb);
+
+		__vlan_hwaccel_put_tag(nskb, oldskb->vlan_proto, vid);
+	}
 }
 
 static int nft_bridge_iphdr_validate(struct sk_buff *skb)