netdev - [PATCH net-next v3 1/4] ipv4: no CHECKSUM_PARTIAL on MSG

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Message-Id: <1445982042-3207-2-git-send-email-hannes@stressinduktion.org>
Date:	Tue, 27 Oct 2015 22:40:39 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	netdev@...r.kernel.org
Cc:	edumazet@...gle.com, vyasevich@...il.com, bcodding@...hat.com,
	tom@...bertland.com,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: [PATCH net-next v3 1/4] ipv4: no CHECKSUM_PARTIAL on MSG_MORE corked sockets

We cannot reliable calculate packet size on MSG_MORE corked sockets
and thus cannot decide if they are going to be fragmented later on,
so better not use CHECKSUM_PARTIAL in the first place.

Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Vlad Yasevich <vyasevich@...il.com>
Cc: Benjamin Coddington <bcodding@...hat.com>
Cc: Tom Herbert <tom@...bertland.com>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
 net/ipv4/ip_output.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 50e2973..0b02417 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -911,6 +911,7 @@ static int __ip_append_data(struct sock *sk,
 	if (transhdrlen &&
 	    length + fragheaderlen <= mtu &&
 	    rt->dst.dev->features & NETIF_F_V4_CSUM &&
+	    !(flags & MSG_MORE) &&
 	    !exthdrlen)
 		csummode = CHECKSUM_PARTIAL;
 
-- 
2.5.0

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