From: David Ahern <dsa@cumulusnetworks.com>
Date: Wed, 12 Apr 2017 18:49:04 +0000 (-0700)
Subject: net: ipv6: send unsolicited NA on admin up
X-Git-Tag: v4.4.124~81
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=a34b1eb66ee96a29f208ad2528ca42ab9c8a6894;p=thirdparty%2Fkernel%2Fstable.git

net: ipv6: send unsolicited NA on admin up


[ Upstream commit 4a6e3c5def13c91adf2acc613837001f09af3baa ]

ndisc_notify is the ipv6 equivalent to arp_notify. When arp_notify is
set to 1, gratuitous arp requests are sent when the device is brought up.
The same is expected when ndisc_notify is set to 1 (per ndisc_notify in
Documentation/networking/ip-sysctl.txt). The NA is not sent on NETDEV_UP
event; add it.

Fixes: 5cb04436eef6 ("ipv6: add knob to send unsolicited ND on link-layer address change")
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 84afb9a772784..55810e4899f19 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1686,6 +1686,8 @@ static int ndisc_netdev_event(struct notifier_block *this, unsigned long event,
 	case NETDEV_CHANGEADDR:
 		neigh_changeaddr(&nd_tbl, dev);
 		fib6_run_gc(0, net, false);
+		/* fallthrough */
+	case NETDEV_UP:
 		idev = in6_dev_get(dev);
 		if (!idev)
 			break;