[patch 09/39] [IPV6]: Address autoconfiguration does not work after device down/up cycle

[Chris Wright <chrisw@sous-sol.org>]

-stable review patch.  If anyone has any objections, please let us know.
------------------

If you set network interface down and up again, the IPv6 address
autoconfiguration does not work. 'ip addr' shows that the link-local
address is in tentative state. We don't even react to periodical router
advertisements.

During NETDEV_DOWN we clear IF_READY, and we don't set it back in
NETDEV_UP. While starting to perform DAD on the link-local address, we
notice that the device is not in IF_READY, and we abort autoconfiguration
process (which would eventually send router solicitations).

Acked-by: Juha-Matti Tapio <jmtapio@verkkotelakka.net>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

 net/ipv6/addrconf.c |    3 +++
 1 files changed, 3 insertions(+)

--- linux-2.6.15.4.orig/net/ipv6/addrconf.c
+++ linux-2.6.15.4/net/ipv6/addrconf.c
@@ -2164,6 +2164,9 @@ static int addrconf_notify(struct notifi
 					dev->name);
 				break;
 			}
+
+			if (idev)
+				idev->if_flags |= IF_READY;
 		} else {
 			if (!netif_carrier_ok(dev)) {
 				/* device is still not ready. */

--
-
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