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net: gre: use icmp_hdr() to get inner ip header 

When dealing with icmp messages, the skb->data points the
ip header that triggered the sending of the icmp message.

In gre_cisco_err(), the parse_gre_header() is called, and the
iptunnel_pull_header() is called to pull the skb at the end of
the parse_gre_header(), so the skb->data doesn't point the
inner ip header.

Unfortunately, the ipgre_err still needs those ip addresses in
inner ip header to look up tunnel by ip_tunnel_lookup().

So just use icmp_hdr() to get inner ip header instead of skb->data.

Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Duan Jiong 2014-01-28 11:49:43 +08:00 committed by David S. Miller
parent 3d9667a9e1
commit c0c0c50ff7
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/ip_gre.c
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@ -178,7 +178,7 @@ static int ipgre_err(struct sk_buff *skb, u32 info,
else
itn = net_generic(net, ipgre_net_id);
iph = (const struct iphdr *)skb->data;
iph = (const struct iphdr *)(icmp_hdr(skb) + 1);
t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,
iph->daddr, iph->saddr, tpi->key);