From 3985e8a3611a93bb36789f65db862e5700aab65e Mon Sep 17 00:00:00 2001
From: Erik Kline <ek@google.com>
Date: Wed, 22 Jul 2015 16:38:25 +0900
Subject: [PATCH] ipv6: sysctl to restrict candidate source addresses

Per RFC 6724, section 4, "Candidate Source Addresses":

    It is RECOMMENDED that the candidate source addresses be the set
    of unicast addresses assigned to the interface that will be used
    to send to the destination (the "outgoing" interface).

Add a sysctl to enable this behaviour.

Signed-off-by: Erik Kline <ek@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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