linux-kernel - [PATCH] ipip, sit: copy parms.name after register

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Message-ID: <CAM7b5hzt8D6hn3=XEcm9E3_BwJxj-YABpkufCpuhjiPLDxCsMQ@mail.gmail.com>
Date:	Tue, 6 Dec 2011 17:25:24 +0800
From:	Ted Feng <artisdom@...il.com>
To:	Jiri Pirko <jpirko@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Josh Boyer <jwboyer@...hat.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH] ipip, sit: copy parms.name after register_netdevice

Same fix as 731abb9cb2 for ipip and sit tunnel.
Commit 1c5cae815d removed an explicit call to dev_alloc_name in
ipip_tunnel_locate
and ipip6_tunnel_locate, because register_netdevice will now create a
valid name.
However the tunnel keeps a copy of the name in the private parms structure.

This shows up if you do a simple tunnel add, followed by a tunnel show:

$ sudo ip tunnel add mode ipip remote 10.2.20.211
$ ip tunnel
tunl0: ip/ip  remote any  local any  ttl inherit  nopmtudisc
tunl%d: ip/ip  remote 10.2.20.211  local any  ttl inherit
$ sudo ip tunnel add mode sit remote 10.2.20.212
$ ip tunnel
sit0: ipv6/ip  remote any  local any  ttl 64  nopmtudisc 6rd-prefix 2002::/16
sit%d: ioctl 89f8 failed: No such device
sit%d: ipv6/ip  remote 10.2.20.212  local any  ttl inherit

Signed-off-by: Ted Feng <artisdom@...il.com>

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 065effd..0b2e732 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -285,6 +285,8 @@ static struct ip_tunnel *
ipip_tunnel_locate(struct net *net,
 	if (register_netdevice(dev) < 0)
 		goto failed_free;

+	strcpy(nt->parms.name, dev->name);
+
 	dev_hold(dev);
 	ipip_tunnel_link(ipn, nt);
 	return nt;
@@ -759,7 +761,6 @@ static int ipip_tunnel_init(struct net_device *dev)
 	struct ip_tunnel *tunnel = netdev_priv(dev);

 	tunnel->dev = dev;
-	strcpy(tunnel->parms.name, dev->name);

 	memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
 	memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
@@ -825,6 +826,7 @@ static void ipip_destroy_tunnels(struct ipip_net
*ipn, struct list_head *head)
 static int __net_init ipip_init_net(struct net *net)
 {
 	struct ipip_net *ipn = net_generic(net, ipip_net_id);
+	struct ip_tunnel *t;
 	int err;

 	ipn->tunnels[0] = ipn->tunnels_wc;
@@ -848,6 +850,9 @@ static int __net_init ipip_init_net(struct net *net)
 	if ((err = register_netdev(ipn->fb_tunnel_dev)))
 		goto err_reg_dev;

+	t = netdev_priv(ipn->fb_tunnel_dev);
+
+	strcpy(t->parms.name, ipn->fb_tunnel_dev->name);
 	return 0;

 err_reg_dev:
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index a7a1860..96f3623 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -263,6 +263,8 @@ static struct ip_tunnel
*ipip6_tunnel_locate(struct net *net,
 	if (register_netdevice(dev) < 0)
 		goto failed_free;

+	strcpy(nt->parms.name, dev->name);
+
 	dev_hold(dev);

 	ipip6_tunnel_link(sitn, nt);
@@ -1144,7 +1146,6 @@ static int ipip6_tunnel_init(struct net_device *dev)
 	struct ip_tunnel *tunnel = netdev_priv(dev);

 	tunnel->dev = dev;
-	strcpy(tunnel->parms.name, dev->name);

 	memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
 	memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
@@ -1207,6 +1208,7 @@ static void __net_exit
sit_destroy_tunnels(struct sit_net *sitn, struct list_hea
 static int __net_init sit_init_net(struct net *net)
 {
 	struct sit_net *sitn = net_generic(net, sit_net_id);
+	struct ip_tunnel *t;
 	int err;

 	sitn->tunnels[0] = sitn->tunnels_wc;
@@ -1231,6 +1233,9 @@ static int __net_init sit_init_net(struct net *net)
 	if ((err = register_netdev(sitn->fb_tunnel_dev)))
 		goto err_reg_dev;

+	t = netdev_priv(sitn->fb_tunnel_dev);
+
+	strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
 	return 0;

 err_reg_dev:
--
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