netdev - Re: [PATCH] [net]ip_tunnel: the lack of vti_link

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Date:	Tue, 18 Nov 2014 15:25:38 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	Xin Long <lucien.xin@...il.com>,
	network dev <netdev@...r.kernel.org>,
	Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: [PATCH] [net]ip_tunnel: the lack of vti_link_ops' dellink() cause
 kernel panic

On Tue, Nov 18, 2014 at 9:23 AM, Nicolas Dichtel
<nicolas.dichtel@...nd.com> wrote:
>
> A quick look at the ipv6 side seems to show that there is the same problem.
> Can
> you provide the IPv6 patch too?
>

IPv6 doesn't use ip_tunnel library, so needs to provide its own implementation:

diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
index ec84d03..3ae094b 100644
--- a/net/ipv6/ip6_vti.c
+++ b/net/ipv6/ip6_vti.c
@@ -911,6 +911,16 @@ static int vti6_newlink(struct net *src_net,
struct net_device *dev,
        return vti6_tnl_create2(dev);
 }

+static void vti6_dellink(struct net_device *dev, struct list_head *head)
+{
+       struct net *net = dev_net(dev);
+       struct vti6_net *ip6n = net_generic(net, vti6_net_id);
+
+       if (dev != ip6n->fb_tnl_dev)
+               unregister_netdevice_queue(dev, head);
+}
+
+
 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
                           struct nlattr *data[])
 {
@@ -986,6 +996,7 @@ static struct rtnl_link_ops vti6_link_ops __read_mostly = {
        .setup          = vti6_dev_setup,
        .validate       = vti6_validate,
        .newlink        = vti6_newlink,
+       .dellink        = vti6_dellink,
        .changelink     = vti6_changelink,
        .get_size       = vti6_get_size,
        .fill_info      = vti6_fill_info,
--
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