netdev - [PATCH v2 net-next] ipv6: Partial checksum only UDP packets

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Date:	Tue, 10 Feb 2015 11:37:29 -0500
From:	Vladislav Yasevich <vyasevich@...il.com>
To:	netdev@...r.kernel.org
Cc:	sd@...asysnail.net, Vladislav Yasevich <vyasevic@...hat.com>
Subject: [PATCH v2 net-next] ipv6: Partial checksum only UDP packets

ip6_append_data is used by other protocols and some of them can't
be partially checksummed.  Only partially checksum UDP protocol.

Fixes: 32dce968dd987a (ipv6: Allow for partial checksums on non-ufo packets)
Reported-by: Sabrina Dubroca <sd@...asysnail.net>
Tested-by: Sabrina Dubroca <sd@...asysnail.net>
Signed-off-by: Vladislav Yasevich <vyasevic@...hat.com>
---
v2:  added tested-by tag and fixed compile issue with prior patch.

 net/ipv6/ip6_output.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index d33df4c..7deebf1 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1273,7 +1273,7 @@ emsgsize:
 	/* If this is the first and only packet and device
 	 * supports checksum offloading, let's use it.
 	 */
-	if (!skb &&
+	if (!skb && sk->sk_protocol == IPPROTO_UDP &&
 	    length + fragheaderlen < mtu &&
 	    rt->dst.dev->features & NETIF_F_V6_CSUM &&
 	    !exthdrlen)
-- 
1.9.3

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