SO_BINDTODEVICE and ipv6

[John Newlin]

In socket.c SO_BINDTODEVICE is not used for ipv6.  Is there any reason this
isn't used for ipv6?

Our system has two interfaces we want to run dhclient on, and this is
causing issues as the dhcpv6 Reply is going to the wrong instance of
dhclient.  Before I change it, I'd like to know the rationale for disabling
it for ipv6.

Cheers

// socket.c  relevant code.
#if defined(SO_BINDTODEVICE)
        /* Bind this socket to this interface. */
        if ((local_family != AF_INET6) && (info->ifp != NULL) &&
            setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE,
                        (char *)(info -> ifp), sizeof(*(info -> ifp))) < 0)
{
                log_fatal("setsockopt: SO_BINDTODEVICE: %m");
        }
#endif

-john
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