aboutsummaryrefslogtreecommitdiff
path: root/include/net/net_namespace.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/net/net_namespace.h')
-rw-r--r--include/net/net_namespace.h123
1 files changed, 123 insertions, 0 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
new file mode 100644
index 00000000000..93aa87d3280
--- /dev/null
+++ b/include/net/net_namespace.h
@@ -0,0 +1,123 @@
+/*
+ * Operations on the network namespace
+ */
+#ifndef __NET_NET_NAMESPACE_H
+#define __NET_NET_NAMESPACE_H
+
+#include <asm/atomic.h>
+#include <linux/workqueue.h>
+#include <linux/list.h>
+
+struct proc_dir_entry;
+struct net_device;
+struct net {
+ atomic_t count; /* To decided when the network
+ * namespace should be freed.
+ */
+ atomic_t use_count; /* To track references we
+ * destroy on demand
+ */
+ struct list_head list; /* list of network namespaces */
+ struct work_struct work; /* work struct for freeing */
+
+ struct proc_dir_entry *proc_net;
+ struct proc_dir_entry *proc_net_stat;
+ struct proc_dir_entry *proc_net_root;
+
+ struct net_device *loopback_dev; /* The loopback */
+
+ struct list_head dev_base_head;
+ struct hlist_head *dev_name_head;
+ struct hlist_head *dev_index_head;
+};
+
+#ifdef CONFIG_NET
+/* Init's network namespace */
+extern struct net init_net;
+#define INIT_NET_NS(net_ns) .net_ns = &init_net,
+#else
+#define INIT_NET_NS(net_ns)
+#endif
+
+extern struct list_head net_namespace_list;
+
+#ifdef CONFIG_NET
+extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
+#else
+static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
+{
+ /* There is nothing to copy so this is a noop */
+ return net_ns;
+}
+#endif
+
+extern void __put_net(struct net *net);
+
+static inline struct net *get_net(struct net *net)
+{
+#ifdef CONFIG_NET
+ atomic_inc(&net->count);
+#endif
+ return net;
+}
+
+static inline struct net *maybe_get_net(struct net *net)
+{
+ /* Used when we know struct net exists but we
+ * aren't guaranteed a previous reference count
+ * exists. If the reference count is zero this
+ * function fails and returns NULL.
+ */
+ if (!atomic_inc_not_zero(&net->count))
+ net = NULL;
+ return net;
+}
+
+static inline void put_net(struct net *net)
+{
+#ifdef CONFIG_NET
+ if (atomic_dec_and_test(&net->count))
+ __put_net(net);
+#endif
+}
+
+static inline struct net *hold_net(struct net *net)
+{
+#ifdef CONFIG_NET
+ atomic_inc(&net->use_count);
+#endif
+ return net;
+}
+
+static inline void release_net(struct net *net)
+{
+#ifdef CONFIG_NET
+ atomic_dec(&net->use_count);
+#endif
+}
+
+#define for_each_net(VAR) \
+ list_for_each_entry(VAR, &net_namespace_list, list)
+
+#ifdef CONFIG_NET_NS
+#define __net_init
+#define __net_exit
+#define __net_initdata
+#else
+#define __net_init __init
+#define __net_exit __exit_refok
+#define __net_initdata __initdata
+#endif
+
+struct pernet_operations {
+ struct list_head list;
+ int (*init)(struct net *net);
+ void (*exit)(struct net *net);
+};
+
+extern int register_pernet_subsys(struct pernet_operations *);
+extern void unregister_pernet_subsys(struct pernet_operations *);
+extern int register_pernet_device(struct pernet_operations *);
+extern void unregister_pernet_device(struct pernet_operations *);
+
+#endif /* __NET_NET_NAMESPACE_H */