From: Tom Herbert <therbert@google.com>
Date: Fri, 2 May 2014 23:29:58 +0000 (-0700)
Subject: net: Implmement RFC 6936 (zero RX csums for UDP/IPv6)
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~36^2~278^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4068579e1e098fa81d48db9ba4432ab664c58561;p=pandora-kernel.git

net: Implmement RFC 6936 (zero RX csums for UDP/IPv6)

RFC 6936 relaxes the requirement of RFC 2460 that UDP/IPv6 packets which
are received with a zero UDP checksum value must be dropped. RFC 6936
allows zero checksums to support tunnels over UDP.

When sk_no_check is set we allow on a socket we allow a zero IPv6
UDP checksum. This is for both sending zero checksum and accepting
a zero checksum on receive.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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