[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 <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

12 files changed, 23 insertions, 17 deletions

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index cf97d8a..559fe94 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/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);
 
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 60cccf2..8289e27 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/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",
diff --git a/drivers/net/eql.c b/drivers/net/eql.c
index 102218c..f1cc66d 100644
--- a/drivers/net/eql.c
+++ b/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;
 
diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index f5c3598..b06c6db 100644
--- a/drivers/net/ifb.c
+++ b/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++;
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index dc74d00..2de073d 100644
--- a/drivers/net/macvlan.c
+++ b/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;
 
diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index c5c70e4..2f130e0 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -216,7 +216,7 @@ static inline struct pppox_sock *get_item_by_addr(struct sockaddr_pppox *sp)
 	struct net_device *dev;
 	int ifindex;
 
-	dev = dev_get_by_name(sp->sa_addr.pppoe.dev);
+	dev = dev_get_by_name(&init_net, sp->sa_addr.pppoe.dev);
 	if(!dev)
 		return NULL;
 	ifindex = dev->ifindex;
@@ -603,7 +603,7 @@ static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
 
 	/* Don't re-bind if sid==0 */
 	if (sp->sa_addr.pppoe.sid != 0) {
-		dev = dev_get_by_name(sp->sa_addr.pppoe.dev);
+		dev = dev_get_by_name(&init_net, sp->sa_addr.pppoe.dev);
 
 		error = -ENODEV;
 		if (!dev)
diff --git a/drivers/net/shaper.c b/drivers/net/shaper.c
index 4c3d98f..3773b385 100644
--- a/drivers/net/shaper.c
+++ b/drivers/net/shaper.c
@@ -86,6 +86,7 @@
 
 #include <net/dst.h>
 #include <net/arp.h>
+#include <net/net_namespace.h>
 
 struct shaper_cb {
 	unsigned long	shapeclock;		/* Time it should go out */
@@ -488,7 +489,7 @@ static int shaper_ioctl(struct net_device *dev,  struct ifreq *ifr, int cmd)
 	{
 		case SHAPER_SET_DEV:
 		{
-			struct net_device *them=__dev_get_by_name(ss->ss_name);
+			struct net_device *them=__dev_get_by_name(&init_net, ss->ss_name);
 			if(them==NULL)
 				return -ENODEV;
 			if(sh->dev)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 62b2b30..691d264f 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -62,6 +62,7 @@
 #include <linux/if_ether.h>
 #include <linux/if_tun.h>
 #include <linux/crc32.h>
+#include <net/net_namespace.h>
 
 #include <asm/system.h>
 #include <asm/uaccess.h>
@@ -475,7 +476,7 @@ static int tun_set_iff(struct file *file, struct ifreq *ifr)
 		     !capable(CAP_NET_ADMIN))
 			return -EPERM;
 	}
-	else if (__dev_get_by_name(ifr->ifr_name))
+	else if (__dev_get_by_name(&init_net, ifr->ifr_name))
 		return -EINVAL;
 	else {
 		char *name;
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index ca1c689..2c86a44 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -345,7 +345,7 @@ static int veth_newlink(struct net_device *dev,
 	else
 		snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
 
-	peer = rtnl_create_link(ifname, &veth_link_ops, tbp);
+	peer = rtnl_create_link(dev->nd_net, ifname, &veth_link_ops, tbp);
 	if (IS_ERR(peer))
 		return PTR_ERR(peer);
 
diff --git a/drivers/net/wan/dlci.c b/drivers/net/wan/dlci.c
index 61041d5..bc12810 100644
--- a/drivers/net/wan/dlci.c
+++ b/drivers/net/wan/dlci.c
@@ -361,7 +361,7 @@ static int dlci_add(struct dlci_add *dlci)
 
 
 	/* validate slave device */
-	slave = dev_get_by_name(dlci->devname);
+	slave = dev_get_by_name(&init_net, dlci->devname);
 	if (!slave)
 		return -ENODEV;
 
@@ -427,7 +427,7 @@ static int dlci_del(struct dlci_add *dlci)
 	int			err;
 
 	/* validate slave device */
-	master = __dev_get_by_name(dlci->devname);
+	master = __dev_get_by_name(&init_net, dlci->devname);
 	if (!master)
 		return(-ENODEV);
 
diff --git a/drivers/net/wan/sbni.c b/drivers/net/wan/sbni.c
index 1cc18e7..8d7e01e 100644
--- a/drivers/net/wan/sbni.c
+++ b/drivers/net/wan/sbni.c
@@ -54,6 +54,7 @@
 #include <linux/init.h>
 #include <linux/delay.h>
 
+#include <net/net_namespace.h>
 #include <net/arp.h>
 
 #include <asm/io.h>
@@ -1361,7 +1362,7 @@ sbni_ioctl( struct net_device  *dev,  struct ifreq  *ifr,  int  cmd )
 
 		if (copy_from_user( slave_name, ifr->ifr_data, sizeof slave_name ))
 			return -EFAULT;
-		slave_dev = dev_get_by_name( slave_name );
+		slave_dev = dev_get_by_name(&init_net, slave_name );
 		if( !slave_dev  ||  !(slave_dev->flags & IFF_UP) ) {
 			printk( KERN_ERR "%s: trying to enslave non-active "
 				"device %s\n", dev->name, slave_name );
diff --git a/drivers/net/wireless/strip.c b/drivers/net/wireless/strip.c
index edb214e..904e548 100644
--- a/drivers/net/wireless/strip.c
+++ b/drivers/net/wireless/strip.c
@@ -1972,7 +1972,7 @@ static struct net_device *get_strip_dev(struct strip *strip_info)
 		      sizeof(zero_address))) {
 		struct net_device *dev;
 		read_lock_bh(&dev_base_lock);
-		for_each_netdev(dev) {
+		for_each_netdev(&init_net, dev) {
 			if (dev->type == strip_info->dev->type &&
 			    !memcmp(dev->dev_addr,
 				    &strip_info->true_dev_addr,