netdev - [PATCH net] ipv4: Fix ip-header identification for gso packets.

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Message-Id: <1364098248-1766-1-git-send-email-pshelar@nicira.com>
Date:	Sat, 23 Mar 2013 21:10:48 -0700
From:	Pravin B Shelar <pshelar@...ira.com>
To:	amwang@...hat.com
Cc:	netdev@...r.kernel.org, Pravin B Shelar <pshelar@...ira.com>
Subject: [PATCH net] ipv4: Fix ip-header identification for gso packets.

For TCP protocol ip-header id needs to be incremented even if
IP_DF flag is set. This behaviour was changed in commit
490ab08127cebc25e3a26 (IP_GRE: Fix IP-Identification).

Following patch fixes it so that identification is always
incremented for TCP.

Reported-by: Cong Wang <amwang@...hat.com>
Signed-off-by: Pravin B Shelar <pshelar@...ira.com>

---
 net/ipv4/af_inet.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 9e5882c..4958b9d 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1334,7 +1334,7 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 				iph->frag_off |= htons(IP_MF);
 			offset += (skb->len - skb->mac_len - iph->ihl * 4);
 		} else  {
-			if (!(iph->frag_off & htons(IP_DF)))
+			if (proto == IPPROTO_TCP || !(iph->frag_off & htons(IP_DF)))
 				iph->id = htons(id++);
 		}
 		iph->tot_len = htons(skb->len - skb->mac_len);
-- 
1.7.1

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