From: Daniel Borkmann <dborkman@redhat.com>
Date: Wed, 30 Oct 2013 10:50:51 +0000 (+0100)
Subject: net: skb_checksum: allow custom update/combine for walking skb
X-Git-Tag: v3.13-rc1~105^2~76^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2817a336d4d533fb8b68719723cd60ea7dd7c09e;p=pandora-kernel.git

net: skb_checksum: allow custom update/combine for walking skb

Currently, skb_checksum walks over 1) linearized, 2) frags[], and
3) frag_list data and calculats the one's complement, a 32 bit
result suitable for feeding into itself or csum_tcpudp_magic(),
but unsuitable for SCTP as we're calculating CRC32c there.

Hence, in order to not re-implement the very same function in
SCTP (and maybe other protocols) over and over again, use an
update() + combine() callback internally to allow for walking
over the skb with different algorithms.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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