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

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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>
This commit is contained in:
Brian Haley 2007-10-11 14:39:29 -07:00 committed by David S. Miller
parent 73aaf9355b
commit 4953f0fcc0
1 changed files with 8 additions and 5 deletions
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13
net/ipv6/ipv6_sockglue.c
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@ -539,12 +539,15 @@ 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 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
goto e_inval;
if (__dev_get_by_index(&init_net, val) == NULL) {
retv = -ENODEV;
break;
if (val) {
if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
goto e_inval;
if (__dev_get_by_index(&init_net, val) == NULL) {
retv = -ENODEV;
break;
}
}
np->mcast_oif = val;
retv = 0;