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authorHannes Frederic Sowa <hannes@stressinduktion.org>2015-10-27 22:40:39 +0100
committerDavid S. Miller <davem@davemloft.net>2015-11-01 12:01:27 -0500
commitd749c9cbffd666956694f307d237e018c464d973 (patch)
tree0aa118b137d47996cc230333271d247dc0ad74bc /net
parentb75ec3af27bf011a760e2f44eb25a99b6fbb0fb3 (diff)
downloadlinux-d749c9cbffd666956694f307d237e018c464d973.tar.bz2
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@google.com> Cc: Vlad Yasevich <vyasevich@gmail.com> Cc: Benjamin Coddington <bcodding@redhat.com> Cc: Tom Herbert <tom@herbertland.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ip_output.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 50e29737b584..0b024178edd3 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;