tree f35705517e8f907e5c777c55d5a41c80d3f0e959
parent 73aaf9355b71d295fd72dc0b93fcdd275c56648f
author Brian Haley <brian.haley@hp.com> 1192138769 -0700
committer David S. Miller <davem@davemloft.net> 1192138769 -0700

[IPv6]: Update setsockopt(IPV6_MULTICAST_IF) to support RFC 3493, try2

 From RFC 3493, Section 5.2:

       IPV6_MULTICAST_IF

          Set the interface to use for outgoing multicast packets.  The
          argument is the index of the interface to use.  If the
          interface index is specified as zero, the system selects the
          interface (for example, by looking up the address in a routing
          table and using the resulting interface).

This patch adds support for (index == 0) to reset the value to it's 
original state, allowing the system to choose the best interface.  IPv4 
already behaves this way.

Signed-off-by: Brian Haley <brian.haley@hp.com>
Acked-by: David L Stevens <dlstevens@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>