From: wenxu Date: Wed, 19 Jun 2019 14:35:07 +0000 (+0800) Subject: netfilter: bridge: Fix non-untagged fragment packet X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=29099462354fdfa601f8d08dd5664bdfa4f1eaec;p=openwrt%2Fstaging%2Fblogic.git netfilter: bridge: Fix non-untagged fragment packet ip netns exec ns1 ip a a dev eth0 10.0.0.7/24 ip netns exec ns2 ip link a link eth0 name vlan type vlan id 200 ip netns exec ns2 ip a a dev vlan 10.0.0.8/24 ip l add dev br0 type bridge vlan_filtering 1 brctl addif br0 veth1 brctl addif br0 veth2 bridge vlan add dev veth1 vid 200 pvid untagged bridge vlan add dev veth2 vid 200 A two fragment packet sent from ns2 contains the vlan tag 200. In the bridge conntrack, this packet will defrag to one skb with fraglist. When the packet is forwarded to ns1 through veth1, the first skb vlan tag will be cleared by the "untagged" flags. But the vlan tag in the second skb is still tagged, so the second fragment ends up with tag 200 to ns1. So if the first fragment packet doesn't contain the vlan tag, all of the remain should not contain vlan tag. Fixes: 3c171f496ef5 ("netfilter: bridge: add connection tracking system") Signed-off-by: wenxu Acked-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- diff --git a/net/bridge/netfilter/nf_conntrack_bridge.c b/net/bridge/netfilter/nf_conntrack_bridge.c index b675cd7c1a82..4f5444d2a526 100644 --- a/net/bridge/netfilter/nf_conntrack_bridge.c +++ b/net/bridge/netfilter/nf_conntrack_bridge.c @@ -331,6 +331,8 @@ static int nf_ct_bridge_frag_restore(struct sk_buff *skb, } if (data->vlan_present) __vlan_hwaccel_put_tag(skb, data->vlan_proto, data->vlan_tci); + else if (skb_vlan_tag_present(skb)) + __vlan_hwaccel_clear_tag(skb); skb_copy_to_linear_data_offset(skb, -ETH_HLEN, data->mac, ETH_HLEN); skb_reset_mac_header(skb);