From: Kristian Slavov <kristian.slavov@nomadiclab.com>
Date: Wed, 15 Feb 2006 22:42:14 +0000 (+0100)
Subject: [PATCH] Address autoconfiguration does not work after device down/up cycle
X-Git-Tag: v2.6.15.5~30
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f7c4f6a095e9ae25e17681ddc1f9b09d090790de;p=thirdparty%2Fkernel%2Fstable.git

[PATCH] Address autoconfiguration does not work after device down/up cycle

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>
---

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index a60585fd85ad0..3558d64fd8a6b 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2164,6 +2164,9 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
 					dev->name);
 				break;
 			}
+
+			if (idev)
+				idev->if_flags |= IF_READY;
 		} else {
 			if (!netif_carrier_ok(dev)) {
 				/* device is still not ready. */