path: root/net
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authorFlorian Westphal <fw@strlen.de>2015-06-05 13:27:13 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2015-06-12 14:16:55 +0200
commitd7b597421519d6f680eb8e152a0d8447466ee2d6 (patch)
tree552f6c80a7f142bc38d645a9e2874ebce433ccd8 /net
parentnet: ip_fragment: remove BRIDGE_NETFILTER mtu special handling (diff)
netfilter: bridge: restore vlan tag when refragmenting
If bridge netfilter is used with both bridge-nf-call-iptables and bridge-nf-filter-vlan-tagged enabled then ip fragments in VLAN frames are sent without the vlan header. This has never worked reliably. Turns out this relied on pre-3.5 behaviour where skb frag_list was used to store ip fragments; ip_fragment() then re-used these skbs. But since commit 3cc4949269e01f39443d0fcfffb5bc6b47878d45 ("ipv4: use skb coalescing in defragmentation") this is no longer the case. ip_do_fragment now needs to allocate new skbs, but these don't contain the vlan tag information anymore. Fix it by storing vlan information of the ressembled skb in the br netfilter percpu frag area, and restore them for each of the fragments. Fixes: 3cc4949269e01f3 ("ipv4: use skb coalescing in defragmentation") Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
1 files changed, 10 insertions, 0 deletions
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index 1e62ae5d8f4e..e4e5f2f29173 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -116,6 +116,8 @@ struct brnf_frag_data {
u8 encap_size;
u8 size;
+ u16 vlan_tci;
+ __be16 vlan_proto;
static DEFINE_PER_CPU(struct brnf_frag_data, brnf_frag_data_storage);
@@ -909,6 +911,11 @@ static int br_nf_push_frag_xmit(struct sock *sk, struct sk_buff *skb)
return 0;
+ if (data->vlan_tci) {
+ skb->vlan_tci = data->vlan_tci;
+ skb->vlan_proto = data->vlan_proto;
+ }
skb_copy_to_linear_data_offset(skb, -data->size, data->mac, data->size);
__skb_push(skb, data->encap_size);
@@ -972,6 +979,9 @@ static int br_nf_dev_queue_xmit(struct sock *sk, struct sk_buff *skb)
data = this_cpu_ptr(&brnf_frag_data_storage);
+ data->vlan_tci = skb->vlan_tci;
+ data->vlan_proto = skb->vlan_proto;
data->encap_size = nf_bridge_encap_header_len(skb);
data->size = ETH_HLEN + data->encap_size;