[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>

4 files changed, 18 insertions, 6 deletions

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 547247681345..fac42db7f6d0 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -22,6 +22,10 @@ struct net {
 	struct proc_dir_entry 	*proc_net;
 	struct proc_dir_entry 	*proc_net_stat;
 	struct proc_dir_entry 	*proc_net_root;
+
+	struct list_head 	dev_base_head;
+	struct hlist_head 	*dev_name_head;
+	struct hlist_head	*dev_index_head;
 };
 
 extern struct net init_net;
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 7968b1d66369..f285de69c615 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -2,6 +2,7 @@
 #define __NET_PKT_CLS_H
 
 #include <linux/pkt_cls.h>
+#include <net/net_namespace.h>
 #include <net/sch_generic.h>
 #include <net/act_api.h>
 
@@ -351,7 +352,7 @@ tcf_match_indev(struct sk_buff *skb, char *indev)
 	if (indev[0]) {
 		if  (!skb->iif)
 			return 0;
-		dev = __dev_get_by_index(skb->iif);
+		dev = __dev_get_by_index(&init_net, skb->iif);
 		if (!dev || strcmp(indev, dev->name))
 			return 0;
 	}
diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h
index 8218288ab7ee..793863e09c69 100644
--- a/include/net/rtnetlink.h
+++ b/include/net/rtnetlink.h
@@ -78,7 +78,7 @@ extern void	__rtnl_link_unregister(struct rtnl_link_ops *ops);
 extern int	rtnl_link_register(struct rtnl_link_ops *ops);
 extern void	rtnl_link_unregister(struct rtnl_link_ops *ops);
 
-extern struct net_device *rtnl_create_link(char *ifname,
+extern struct net_device *rtnl_create_link(struct net *net, char *ifname,
 		const struct rtnl_link_ops *ops, struct nlattr *tb[]);
 extern const struct nla_policy ifla_policy[IFLA_MAX+1];
 
diff --git a/include/net/wext.h b/include/net/wext.h
index c02b8decf3af..80b31d826b7a 100644
--- a/include/net/wext.h
+++ b/include/net/wext.h
@@ -5,16 +5,23 @@
  * wireless extensions interface to the core code
  */
 
+struct net;
+
 #ifdef CONFIG_WIRELESS_EXT
-extern int wext_proc_init(void);
-extern int wext_handle_ioctl(struct ifreq *ifr, unsigned int cmd,
+extern int wext_proc_init(struct net *net);
+extern void wext_proc_exit(struct net *net);
+extern int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
 			     void __user *arg);
 #else
-static inline int wext_proc_init(void)
+static inline int wext_proc_init(struct net *net)
 {
 	return 0;
 }
-static inline int wext_handle_ioctl(struct ifreq *ifr, unsigned int cmd,
+static inline void wext_proc_exit(struct net *net)
+{
+	return;
+}
+static inline int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
 				    void __user *arg)
 {
 	return -EINVAL;