From: Andrew Lunn <andrew@lunn.ch>
Date: Fri, 1 May 2015 14:39:54 +0000 (+0200)
Subject: net: ipv4: route: Fix sending IGMP messages with link address
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~134^2~381
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6a21165480a066a27c1f1dbd32aec581c612ba23;p=pandora-kernel.git

net: ipv4: route: Fix sending IGMP messages with link address

In setups with a global scope address on an interface, and a lesser
scope address on an interface sending IGMP reports, the reports can be
sent using the other interfaces global scope address rather than the
local interface address. RFC 2236 suggests:

     Ignore the Report if you cannot identify the source address of
     the packet as belonging to a subnet assigned to the interface on
     which the packet was received.

since such reports could be forged.

Look at the protocol when deciding if a RT_SCOPE_LINK address should
be used for the packet.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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