netfilter: bridge: really save frag_max_size between PRE and POST_ROUTING

We also need to save/store in forward, else br_parse_ip_options call
will zero frag_max_size as well.

Fixes: 93fdd47e5 ('bridge: Save frag_max_size between PRE_ROUTING and POST_ROUTING')
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index f3884a1..282ed76 100644 (file)
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -686,6 +686,13 @@ static int br_nf_forward_finish(struct sk_buff *skb)
        struct net_device *in;
 
        if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) {
+               int frag_max_size;
+
+               if (skb->protocol == htons(ETH_P_IP)) {
+                       frag_max_size = IPCB(skb)->frag_max_size;
+                       BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size;
+               }
+
                in = nf_bridge->physindev;
                if (nf_bridge->mask & BRNF_PKT_TYPE) {
                        skb->pkt_type = PACKET_OTHERHOST;
@@ -745,8 +752,14 @@ static unsigned int br_nf_forward_ip(const struct nf_hook_ops *ops,
                nf_bridge->mask |= BRNF_PKT_TYPE;
        }
 
-       if (pf == NFPROTO_IPV4 && br_parse_ip_options(skb))
-               return NF_DROP;
+       if (pf == NFPROTO_IPV4) {
+               int frag_max = BR_INPUT_SKB_CB(skb)->frag_max_size;
+
+               if (br_parse_ip_options(skb))
+                       return NF_DROP;
+
+               IPCB(skb)->frag_max_size = frag_max;
+       }
 
        nf_bridge->physoutdev = skb->dev;
        if (pf == NFPROTO_IPV4)