[NET]: Make the device list and device lookups per namespace.

This patch makes most of the generic device layer network
namespace safe.  This patch makes dev_base_head a
network namespace variable, and then it picks up
a few associated variables.  The functions:
dev_getbyhwaddr
dev_getfirsthwbytype
dev_get_by_flags
dev_get_by_name
__dev_get_by_name
dev_get_by_index
__dev_get_by_index
dev_ioctl
dev_ethtool
dev_load
wireless_process_ioctl

were modified to take a network namespace argument, and
deal with it.

vlan_ioctl_set and brioctl_set were modified so their
hooks will receive a network namespace argument.

So basically anthing in the core of the network stack that was
affected to by the change of dev_base was modified to handle
multiple network namespaces.  The rest of the network stack was
simply modified to explicitly use &init_net the initial network
namespace.  This can be fixed when those components of the network
stack are modified to handle multiple network namespaces.

For now the ifindex generator is left global.

Fundametally ifindex numbers are per namespace, or else
we will have corner case problems with migration when
we get that far.

At the same time there are assumptions in the network stack
that the ifindex of a network device won't change.  Making
the ifindex number global seems a good compromise until
the network stack can cope with ifindex changes when
you change namespaces, and the like.

Signed-off-by: Eric W. Biederman <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: ebiederm

arch/s390/appldata/appldata_net_sum.c

@@ -16,6 +16,7 @@
 #include <linux/errno.h>
 #include <linux/kernel_stat.h>
 #include <linux/netdevice.h>
+#include <net/net_namespace.h>
 
 #include "appldata.h"
 
@@ -107,7 +108,7 @@ static void appldata_get_net_sum_data(void *data)
 	tx_dropped = 0;
 	collisions = 0;
 	read_lock(&dev_base_lock);
-	for_each_netdev(dev) {
+	for_each_netdev(&init_net, dev) {
 		stats = dev->get_stats(dev);
 		rx_packets += stats->rx_packets;
 		tx_packets += stats->tx_packets;

arch/sparc64/solaris/ioctl.c

@@ -28,6 +28,7 @@
 #include <linux/compat.h>
 
 #include <net/sock.h>
+#include <net/net_namespace.h>
 
 #include <asm/uaccess.h>
 #include <asm/termios.h>
@@ -686,7 +687,7 @@ static inline int solaris_i(unsigned int fd, unsigned int cmd, u32 arg)
 			int i = 0;
 
 			read_lock_bh(&dev_base_lock);
-			for_each_netdev(d)
+			for_each_netdev(&init_net, d)
 				i++;
 			read_unlock_bh(&dev_base_lock);
 

drivers/atm/idt77252.c

@@ -3576,7 +3576,7 @@ init_card(struct atm_dev *dev)
 	 * XXX: <hack>
 	 */
 	sprintf(tname, "eth%d", card->index);
-	tmp = dev_get_by_name(tname);	/* jhs: was "tmp = dev_get(tname);" */
+	tmp = dev_get_by_name(&init_net, tname);	/* jhs: was "tmp = dev_get(tname);" */
 	if (tmp) {
 		memcpy(card->atmdev->esi, tmp->dev_addr, 6);
 

drivers/block/aoe/aoecmd.c

@@ -9,6 +9,7 @@
 #include <linux/skbuff.h>
 #include <linux/netdevice.h>
 #include <linux/genhd.h>
+#include <net/net_namespace.h>
 #include <asm/unaligned.h>
 #include "aoe.h"
 
@@ -194,7 +195,7 @@ aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff **tail)
 	sl = sl_tail = NULL;
 
 	read_lock(&dev_base_lock);
-	for_each_netdev(ifp) {
+	for_each_netdev(&init_net, ifp) {
 		dev_hold(ifp);
 		if (!is_aoe_netif(ifp))
 			goto cont;

drivers/infiniband/hw/cxgb3/cxio_hal.c

@@ -37,6 +37,7 @@
 #include <linux/spinlock.h>
 #include <linux/pci.h>
 #include <linux/dma-mapping.h>
+#include <net/net_namespace.h>
 
 #include "cxio_resource.h"
 #include "cxio_hal.h"
@@ -894,7 +895,7 @@ int cxio_rdev_open(struct cxio_rdev *rdev_p)
 		if (cxio_hal_find_rdev_by_name(rdev_p->dev_name)) {
 			return -EBUSY;
 		}
-		netdev_p = dev_get_by_name(rdev_p->dev_name);
+		netdev_p = dev_get_by_name(&init_net, rdev_p->dev_name);
 		if (!netdev_p) {
 			return -EINVAL;
 		}

drivers/net/bonding/bond_main.c

@@ -3719,7 +3719,7 @@ static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd
 	}
 
 	down_write(&(bonding_rwsem));
-	slave_dev = dev_get_by_name(ifr->ifr_slave);
+	slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
 
 	dprintk("slave_dev=%p: \n", slave_dev);
 

drivers/net/bonding/bond_sysfs.c

@@ -35,6 +35,7 @@
 #include <linux/ctype.h>
 #include <linux/inet.h>
 #include <linux/rtnetlink.h>
+#include <net/net_namespace.h>
 
 /* #define BONDING_DEBUG 1 */
 #include "bonding.h"
@@ -299,7 +300,7 @@ static ssize_t bonding_store_slaves(struct device *d,
 		read_unlock_bh(&bond->lock);
 		printk(KERN_INFO DRV_NAME ": %s: Adding slave %s.\n",
 		       bond->dev->name, ifname);
-		dev = dev_get_by_name(ifname);
+		dev = dev_get_by_name(&init_net, ifname);
 		if (!dev) {
 			printk(KERN_INFO DRV_NAME
 			       ": %s: Interface %s does not exist!\n",

drivers/net/eql.c

@@ -116,6 +116,7 @@
 #include <linux/init.h>
 #include <linux/timer.h>
 #include <linux/netdevice.h>
+#include <net/net_namespace.h>
 
 #include <linux/if.h>
 #include <linux/if_arp.h>
@@ -412,7 +413,7 @@ static int eql_enslave(struct net_device *master_dev, slaving_request_t __user *
 	if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))
 		return -EFAULT;
 
-	slave_dev  = dev_get_by_name(srq.slave_name);
+	slave_dev  = dev_get_by_name(&init_net, srq.slave_name);
 	if (slave_dev) {
 		if ((master_dev->flags & IFF_UP) == IFF_UP) {
 			/* slave is not a master & not already a slave: */
@@ -460,7 +461,7 @@ static int eql_emancipate(struct net_device *master_dev, slaving_request_t __use
 	if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))
 		return -EFAULT;
 
-	slave_dev = dev_get_by_name(srq.slave_name);
+	slave_dev = dev_get_by_name(&init_net, srq.slave_name);
 	ret = -EINVAL;
 	if (slave_dev) {
 		spin_lock_bh(&eql->queue.lock);
@@ -493,7 +494,7 @@ static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *scp)
 	if (copy_from_user(&sc, scp, sizeof (slave_config_t)))
 		return -EFAULT;
 
-	slave_dev = dev_get_by_name(sc.slave_name);
+	slave_dev = dev_get_by_name(&init_net, sc.slave_name);
 	if (!slave_dev)
 		return -ENODEV;
 
@@ -528,7 +529,7 @@ static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *scp)
 	if (copy_from_user(&sc, scp, sizeof (slave_config_t)))
 		return -EFAULT;
 
-	slave_dev = dev_get_by_name(sc.slave_name);
+	slave_dev = dev_get_by_name(&init_net, sc.slave_name);
 	if (!slave_dev)
 		return -ENODEV;
 

drivers/net/ifb.c

@@ -34,6 +34,7 @@
 #include <linux/init.h>
 #include <linux/moduleparam.h>
 #include <net/pkt_sched.h>
+#include <net/net_namespace.h>
 
 #define TX_TIMEOUT  (2*HZ)
 
@@ -97,7 +98,7 @@ static void ri_tasklet(unsigned long dev)
 		stats->tx_packets++;
 		stats->tx_bytes +=skb->len;
 
-		skb->dev = __dev_get_by_index(skb->iif);
+		skb->dev = __dev_get_by_index(&init_net, skb->iif);
 		if (!skb->dev) {
 			dev_kfree_skb(skb);
 			stats->tx_dropped++;

drivers/net/macvlan.c

@@ -376,7 +376,7 @@ static int macvlan_newlink(struct net_device *dev,
 	if (!tb[IFLA_LINK])
 		return -EINVAL;
 
-	lowerdev = __dev_get_by_index(nla_get_u32(tb[IFLA_LINK]));
+	lowerdev = __dev_get_by_index(dev->nd_net, nla_get_u32(tb[IFLA_LINK]));
 	if (lowerdev == NULL)
 		return -ENODEV;