[NETNS]: Process devinet ioctl in the correct namespace.

Add namespace parameter to devinet_ioctl and locate device inside it for
state changes.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/inetdevice.h

@@ -129,7 +129,7 @@ extern int unregister_inetaddr_notifier(struct notifier_block *nb);
 
 extern struct net_device *ip_dev_find(struct net *net, __be32 addr);
 extern int		inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
-extern int		devinet_ioctl(unsigned int cmd, void __user *);
+extern int		devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
 extern void		devinet_init(void);
 extern struct in_device	*inetdev_by_index(struct net *, int);
 extern __be32		inet_select_addr(const struct net_device *dev, __be32 dst, int scope);

net/ipv4/af_inet.c

@@ -784,6 +784,7 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 {
 	struct sock *sk = sock->sk;
 	int err = 0;
+	struct net *net = sk->sk_net;
 
 	switch (cmd) {
 		case SIOCGSTAMP:
@@ -795,12 +796,12 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		case SIOCADDRT:
 		case SIOCDELRT:
 		case SIOCRTMSG:
-			err = ip_rt_ioctl(sk->sk_net, cmd, (void __user *)arg);
+			err = ip_rt_ioctl(net, cmd, (void __user *)arg);
 			break;
 		case SIOCDARP:
 		case SIOCGARP:
 		case SIOCSARP:
-			err = arp_ioctl(sk->sk_net, cmd, (void __user *)arg);
+			err = arp_ioctl(net, cmd, (void __user *)arg);
 			break;
 		case SIOCGIFADDR:
 		case SIOCSIFADDR:
@@ -813,7 +814,7 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		case SIOCSIFPFLAGS:
 		case SIOCGIFPFLAGS:
 		case SIOCSIFFLAGS:
-			err = devinet_ioctl(cmd, (void __user *)arg);
+			err = devinet_ioctl(net, cmd, (void __user *)arg);
 			break;
 		default:
 			if (sk->sk_prot->ioctl)

net/ipv4/devinet.c

@@ -595,7 +595,7 @@ static __inline__ int inet_abc_len(__be32 addr)
 }
 
 
-int devinet_ioctl(unsigned int cmd, void __user *arg)
+int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
 {
 	struct ifreq ifr;
 	struct sockaddr_in sin_orig;
@@ -624,7 +624,7 @@ int devinet_ioctl(unsigned int cmd, void __user *arg)
 		*colon = 0;
 
 #ifdef CONFIG_KMOD
-	dev_load(&init_net, ifr.ifr_name);
+	dev_load(net, ifr.ifr_name);
 #endif
 
 	switch (cmd) {
@@ -665,7 +665,7 @@ int devinet_ioctl(unsigned int cmd, void __user *arg)
 	rtnl_lock();
 
 	ret = -ENODEV;
-	if ((dev = __dev_get_by_name(&init_net, ifr.ifr_name)) == NULL)
+	if ((dev = __dev_get_by_name(net, ifr.ifr_name)) == NULL)
 		goto done;
 
 	if (colon)

net/ipv4/ipconfig.c

@@ -291,7 +291,7 @@ static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 
 	mm_segment_t oldfs = get_fs();
 	set_fs(get_ds());
-	res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
+	res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 	set_fs(oldfs);
 	return res;
 }