1 files changed, 317 insertions, 0 deletions
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
new file mode 100644
index 00000000000..6f71db8c442
--- /dev/null
+++ b/net/core/net_namespace.c
@@ -0,0 +1,317 @@
+#include <linux/workqueue.h>
+#include <linux/rtnetlink.h>
+#include <linux/cache.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <net/net_namespace.h>
+
+/*
+ *	Our network namespace constructor/destructor lists
+ */
+
+static LIST_HEAD(pernet_list);
+static struct list_head *first_device = &pernet_list;
+static DEFINE_MUTEX(net_mutex);
+
+LIST_HEAD(net_namespace_list);
+
+static struct kmem_cache *net_cachep;
+
+struct net init_net;
+EXPORT_SYMBOL_GPL(init_net);
+
+static struct net *net_alloc(void)
+{
+	return kmem_cache_zalloc(net_cachep, GFP_KERNEL);
+}
+
+static void net_free(struct net *net)
+{
+	if (!net)
+		return;
+
+	if (unlikely(atomic_read(&net->use_count) != 0)) {
+		printk(KERN_EMERG "network namespace not free! Usage: %d\n",
+			atomic_read(&net->use_count));
+		return;
+	}
+
+	kmem_cache_free(net_cachep, net);
+}
+
+static void cleanup_net(struct work_struct *work)
+{
+	struct pernet_operations *ops;
+	struct net *net;
+
+	net = container_of(work, struct net, work);
+
+	mutex_lock(&net_mutex);
+
+	/* Don't let anyone else find us. */
+	rtnl_lock();
+	list_del(&net->list);
+	rtnl_unlock();
+
+	/* Run all of the network namespace exit methods */
+	list_for_each_entry_reverse(ops, &pernet_list, list) {
+		if (ops->exit)
+			ops->exit(net);
+	}
+
+	mutex_unlock(&net_mutex);
+
+	/* Ensure there are no outstanding rcu callbacks using this
+	 * network namespace.
+	 */
+	rcu_barrier();
+
+	/* Finally it is safe to free my network namespace structure */
+	net_free(net);
+}
+
+
+void __put_net(struct net *net)
+{
+	/* Cleanup the network namespace in process context */
+	INIT_WORK(&net->work, cleanup_net);
+	schedule_work(&net->work);
+}
+EXPORT_SYMBOL_GPL(__put_net);
+
+/*
+ * setup_net runs the initializers for the network namespace object.
+ */
+static int setup_net(struct net *net)
+{
+	/* Must be called with net_mutex held */
+	struct pernet_operations *ops;
+	int error;
+
+	atomic_set(&net->count, 1);
+	atomic_set(&net->use_count, 0);
+
+	error = 0;
+	list_for_each_entry(ops, &pernet_list, list) {
+		if (ops->init) {
+			error = ops->init(net);
+			if (error < 0)
+				goto out_undo;
+		}
+	}
+out:
+	return error;
+
+out_undo:
+	/* Walk through the list backwards calling the exit functions
+	 * for the pernet modules whose init functions did not fail.
+	 */
+	list_for_each_entry_continue_reverse(ops, &pernet_list, list) {
+		if (ops->exit)
+			ops->exit(net);
+	}
+	goto out;
+}
+
+struct net *copy_net_ns(unsigned long flags, struct net *old_net)
+{
+	struct net *new_net = NULL;
+	int err;
+
+	get_net(old_net);
+
+	if (!(flags & CLONE_NEWNET))
+		return old_net;
+
+#ifndef CONFIG_NET_NS
+	return ERR_PTR(-EINVAL);
+#endif
+
+	err = -ENOMEM;
+	new_net = net_alloc();
+	if (!new_net)
+		goto out;
+
+	mutex_lock(&net_mutex);
+	err = setup_net(new_net);
+	if (err)
+		goto out_unlock;
+
+	rtnl_lock();
+	list_add_tail(&new_net->list, &net_namespace_list);
+	rtnl_unlock();
+
+
+out_unlock:
+	mutex_unlock(&net_mutex);
+out:
+	put_net(old_net);
+	if (err) {
+		net_free(new_net);
+		new_net = ERR_PTR(err);
+	}
+	return new_net;
+}
+
+static int __init net_ns_init(void)
+{
+	int err;
+
+	printk(KERN_INFO "net_namespace: %zd bytes\n", sizeof(struct net));
+	net_cachep = kmem_cache_create("net_namespace", sizeof(struct net),
+					SMP_CACHE_BYTES,
+					SLAB_PANIC, NULL);
+	mutex_lock(&net_mutex);
+	err = setup_net(&init_net);
+
+	rtnl_lock();
+	list_add_tail(&init_net.list, &net_namespace_list);
+	rtnl_unlock();
+
+	mutex_unlock(&net_mutex);
+	if (err)
+		panic("Could not setup the initial network namespace");
+
+	return 0;
+}
+
+pure_initcall(net_ns_init);
+
+static int register_pernet_operations(struct list_head *list,
+				      struct pernet_operations *ops)
+{
+	struct net *net, *undo_net;
+	int error;
+
+	error = 0;
+	list_add_tail(&ops->list, list);
+	for_each_net(net) {
+		if (ops->init) {
+			error = ops->init(net);
+			if (error)
+				goto out_undo;
+		}
+	}
+out:
+	return error;
+
+out_undo:
+	/* If I have an error cleanup all namespaces I initialized */
+	list_del(&ops->list);
+	for_each_net(undo_net) {
+		if (undo_net == net)
+			goto undone;
+		if (ops->exit)
+			ops->exit(undo_net);
+	}
+undone:
+	goto out;
+}
+
+static void unregister_pernet_operations(struct pernet_operations *ops)
+{
+	struct net *net;
+
+	list_del(&ops->list);
+	for_each_net(net)
+		if (ops->exit)
+			ops->exit(net);
+}
+
+/**
+ *      register_pernet_subsys - register a network namespace subsystem
+ *	@ops:  pernet operations structure for the subsystem
+ *
+ *	Register a subsystem which has init and exit functions
+ *	that are called when network namespaces are created and
+ *	destroyed respectively.
+ *
+ *	When registered all network namespace init functions are
+ *	called for every existing network namespace.  Allowing kernel
+ *	modules to have a race free view of the set of network namespaces.
+ *
+ *	When a new network namespace is created all of the init
+ *	methods are called in the order in which they were registered.
+ *
+ *	When a network namespace is destroyed all of the exit methods
+ *	are called in the reverse of the order with which they were
+ *	registered.
+ */
+int register_pernet_subsys(struct pernet_operations *ops)
+{
+	int error;
+	mutex_lock(&net_mutex);
+	error =  register_pernet_operations(first_device, ops);
+	mutex_unlock(&net_mutex);
+	return error;
+}
+EXPORT_SYMBOL_GPL(register_pernet_subsys);
+
+/**
+ *      unregister_pernet_subsys - unregister a network namespace subsystem
+ *	@ops: pernet operations structure to manipulate
+ *
+ *	Remove the pernet operations structure from the list to be
+ *	used when network namespaces are created or destoryed.  In
+ *	addition run the exit method for all existing network
+ *	namespaces.
+ */
+void unregister_pernet_subsys(struct pernet_operations *module)
+{
+	mutex_lock(&net_mutex);
+	unregister_pernet_operations(module);
+	mutex_unlock(&net_mutex);
+}
+EXPORT_SYMBOL_GPL(unregister_pernet_subsys);
+
+/**
+ *      register_pernet_device - register a network namespace device
+ *	@ops:  pernet operations structure for the subsystem
+ *
+ *	Register a device which has init and exit functions
+ *	that are called when network namespaces are created and
+ *	destroyed respectively.
+ *
+ *	When registered all network namespace init functions are
+ *	called for every existing network namespace.  Allowing kernel
+ *	modules to have a race free view of the set of network namespaces.
+ *
+ *	When a new network namespace is created all of the init
+ *	methods are called in the order in which they were registered.
+ *
+ *	When a network namespace is destroyed all of the exit methods
+ *	are called in the reverse of the order with which they were
+ *	registered.
+ */
+int register_pernet_device(struct pernet_operations *ops)
+{
+	int error;
+	mutex_lock(&net_mutex);
+	error = register_pernet_operations(&pernet_list, ops);
+	if (!error && (first_device == &pernet_list))
+		first_device = &ops->list;
+	mutex_unlock(&net_mutex);
+	return error;
+}
+EXPORT_SYMBOL_GPL(register_pernet_device);
+
+/**
+ *      unregister_pernet_device - unregister a network namespace netdevice
+ *	@ops: pernet operations structure to manipulate
+ *
+ *	Remove the pernet operations structure from the list to be
+ *	used when network namespaces are created or destoryed.  In
+ *	addition run the exit method for all existing network
+ *	namespaces.
+ */
+void unregister_pernet_device(struct pernet_operations *ops)
+{
+	mutex_lock(&net_mutex);
+	if (&ops->list == first_device)
+		first_device = first_device->next;
+	unregister_pernet_operations(ops);
+	mutex_unlock(&net_mutex);
+}
+EXPORT_SYMBOL_GPL(unregister_pernet_device);