netdev - Re: [PATCH] ipv6: no addrconf for slave devices

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Date:	Fri, 16 Oct 2015 13:54:58 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Jan Blunck <jblunck@...radead.org>
Cc:	davem@...emloft.net, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, fubar@...ibm.com
Subject: Re: [PATCH] ipv6: no addrconf for slave devices

Fri, Oct 16, 2015 at 12:21:51PM CEST, jblunck@...radead.org wrote:
>If a device without the IFF_SLAVE flag set (e.g. team, bridge, openvswitch
>vport, batman) is enslaved and IPv6 is active then addrconf will be
>initiated and a link-local address is added to the slave interface.
>
>This patch alters the behavior so that addrconf will only run on the master
>device itself. This is achieved by checking the device tree instead of
>checking for a specific flag.
>
>Signed-off-by: Jan Blunck <jblunck@...radead.org>
>---
> net/ipv6/addrconf.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
>diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
>index 9001133..26d61f0 100644
>--- a/net/ipv6/addrconf.c
>+++ b/net/ipv6/addrconf.c
>@@ -3141,8 +3141,12 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
> 
> 	case NETDEV_UP:
> 	case NETDEV_CHANGE:
>-		if (dev->flags & IFF_SLAVE)
>+		/* If a master is set stop IPv6 on this interface */
>+		if (netdev_master_upper_dev_get(dev)) {
>+			if (idev)
>+				addrconf_ifdown(dev, 1);

This breaks teamd if it's using NS/NA ping link-watch on link-local addresses.

What is the reason for this patch? Does it recolve any issue you are
having?
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