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IP_GRE: Fix IP-Identification.

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GRE-GSO generates ip fragments with id 0,2,3,4... for every
GSO packet, which is not correct. Following patch fixes it
by setting ip-header id unique id of fragments are allowed.
As Eric Dumazet suggested it is optimized by using inner ip-header
whenever inner packet is ipv4.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar 2013-02-22 07:30:30 +00:00 • committed by David S. Miller
parent 2bedc2e65b
commit 490ab08127
3 changed files with 23 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

6
net/ipv4/af_inet.c
View file

@ -1332,8 +1332,10 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
if (skb->next != NULL)
iph->frag_off |= htons(IP_MF);
offset += (skb->len - skb->mac_len - iph->ihl * 4);
} else
iph->id = htons(id++);
} else {
if (!(iph->frag_off & htons(IP_DF)))
iph->id = htons(id++);
}
iph->tot_len = htons(skb->len - skb->mac_len);
iph->check = 0;
iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);