[PATCH net v2 1/4] ipv4: no CHECKSUM_PARTIAL on MSG_MORE corked sockets
From: Hannes Frederic Sowa <hidden>
Date: 2015-10-27 15:02:24
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
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 <redacted> Cc: Benjamin Coddington <redacted> Cc: Tom Herbert <redacted> Signed-off-by: Hannes Frederic Sowa <redacted> --- 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