Commit 4953f0fc authored by Brian Haley's avatar Brian Haley Committed by David S. Miller

[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: default avatarBrian Haley <brian.haley@hp.com>
Acked-by: default avatarDavid L Stevens <dlstevens@us.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 73aaf935
......@@ -539,6 +539,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
case IPV6_MULTICAST_IF:
if (sk->sk_type == SOCK_STREAM)
goto e_inval;
if (val) {
if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
goto e_inval;
......@@ -546,6 +548,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
retv = -ENODEV;
break;
}
}
np->mcast_oif = val;
retv = 0;
break;
......
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