From: Lorenzo Colitti <lorenzo@google.com>
Date: Tue, 13 May 2014 17:17:33 +0000 (-0700)
Subject: net: add a sysctl to reflect the fwmark on replies
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~36^2~237^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e110861f86094cd78cc85593b873970092deb43a;p=pandora-kernel.git

net: add a sysctl to reflect the fwmark on replies

Kernel-originated IP packets that have no user socket associated
with them (e.g., ICMP errors and echo replies, TCP RSTs, etc.)
are emitted with a mark of zero. Add a sysctl to make them have
the same mark as the packet they are replying to.

This allows an administrator that wishes to do so to use
mark-based routing, firewalling, etc. for these replies by
marking the original packets inbound.

Tested using user-mode linux:
 - ICMP/ICMPv6 echo replies and errors.
 - TCP RST packets (IPv4 and IPv6).

Signed-off-by: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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