According to the comment in the net/core/sock.c code (in 2.6.20), I should be
able to pass a zero
optlen to the setsockopt method for SO_BINDTODEVICE:
case SO_BINDTODEVICE:
{
char devname[IFNAMSIZ];
/* Sorry... */
if (!capable(CAP_NET_RAW)) {
ret = -EPERM;
break;
}
/* Bind this socket to a particular device like "eth0",
* as specified in the passed interface name. If the
* name is "" or the option length is zero the socket
* is not bound.
*/
However, earlier in that method it returns -EINVAL if optlen is < sizeof(int).
The man page has comments similar to that in the code above.
Also, even when I get the un-bind call working with code similar to:
int z = 0;
setsockopt(s, SOL_SOCKET, SO_BINDTODEVICE, &z, sizeof(z));
The app I'm working on (Xorp) does not appear to work. Perhaps because
the kernel does not clean up the cached route when you un-bind
as it does in the (re)bind logic?
/* Remove any cached route for this socket. */
sk_dst_reset(sk);
Thanks,
Ben
--
Ben Greear <[EMAIL PROTECTED]>
Candela Technologies Inc http://www.candelatech.com
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