1 files changed, 291 insertions, 0 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
new file mode 100644
index 00000000..aef430d7
--- /dev/null
+++ b/include/net/net_namespace.h
@@ -0,0 +1,291 @@
+/*
+ * 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>
+#include <linux/sysctl.h>
+
+#include <net/netns/core.h>
+#include <net/netns/mib.h>
+#include <net/netns/unix.h>
+#include <net/netns/packet.h>
+#include <net/netns/ipv4.h>
+#include <net/netns/ipv6.h>
+#include <net/netns/dccp.h>
+#include <net/netns/x_tables.h>
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+#include <net/netns/conntrack.h>
+#endif
+#include <net/netns/xfrm.h>
+
+struct proc_dir_entry;
+struct net_device;
+struct sock;
+struct ctl_table_header;
+struct net_generic;
+struct sock;
+struct netns_ipvs;
+
+
+#define NETDEV_HASHBITS    8
+#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
+
+struct net {
+	atomic_t		passive;	/* To decided when the network
+						 * namespace should be freed.
+						 */
+	atomic_t		count;		/* To decided when the network
+						 *  namespace should be shut down.
+						 */
+#ifdef NETNS_REFCNT_DEBUG
+	atomic_t		use_count;	/* To track references we
+						 * destroy on demand
+						 */
+#endif
+	spinlock_t		rules_mod_lock;
+
+	struct list_head	list;		/* list of network namespaces */
+	struct list_head	cleanup_list;	/* namespaces on death row */
+	struct list_head	exit_list;	/* Use only net_mutex */
+
+	struct proc_dir_entry 	*proc_net;
+	struct proc_dir_entry 	*proc_net_stat;
+
+#ifdef CONFIG_SYSCTL
+	struct ctl_table_set	sysctls;
+#endif
+
+	struct sock 		*rtnl;			/* rtnetlink socket */
+	struct sock		*genl_sock;
+
+	struct list_head 	dev_base_head;
+	struct hlist_head 	*dev_name_head;
+	struct hlist_head	*dev_index_head;
+
+	/* core fib_rules */
+	struct list_head	rules_ops;
+
+
+	struct net_device       *loopback_dev;          /* The loopback */
+	struct netns_core	core;
+	struct netns_mib	mib;
+	struct netns_packet	packet;
+	struct netns_unix	unx;
+	struct netns_ipv4	ipv4;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	struct netns_ipv6	ipv6;
+#endif
+#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
+	struct netns_dccp	dccp;
+#endif
+#ifdef CONFIG_NETFILTER
+	struct netns_xt		xt;
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+	struct netns_ct		ct;
+#endif
+	struct sock		*nfnl;
+	struct sock		*nfnl_stash;
+#endif
+#ifdef CONFIG_WEXT_CORE
+	struct sk_buff_head	wext_nlevents;
+#endif
+	struct net_generic __rcu	*gen;
+
+	/* Note : following structs are cache line aligned */
+#ifdef CONFIG_XFRM
+	struct netns_xfrm	xfrm;
+#endif
+	struct netns_ipvs	*ipvs;
+};
+
+
+#include <linux/seq_file_net.h>
+
+/* Init's network namespace */
+extern struct net init_net;
+
+#ifdef CONFIG_NET
+extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
+
+#else /* CONFIG_NET */
+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 /* CONFIG_NET */
+
+
+extern struct list_head net_namespace_list;
+
+extern struct net *get_net_ns_by_pid(pid_t pid);
+extern struct net *get_net_ns_by_fd(int pid);
+
+#ifdef CONFIG_NET_NS
+extern void __put_net(struct net *net);
+
+static inline struct net *get_net(struct net *net)
+{
+	atomic_inc(&net->count);
+	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)
+{
+	if (atomic_dec_and_test(&net->count))
+		__put_net(net);
+}
+
+static inline
+int net_eq(const struct net *net1, const struct net *net2)
+{
+	return net1 == net2;
+}
+
+extern void net_drop_ns(void *);
+
+#else
+
+static inline struct net *get_net(struct net *net)
+{
+	return net;
+}
+
+static inline void put_net(struct net *net)
+{
+}
+
+static inline struct net *maybe_get_net(struct net *net)
+{
+	return net;
+}
+
+static inline
+int net_eq(const struct net *net1, const struct net *net2)
+{
+	return 1;
+}
+
+#define net_drop_ns NULL
+#endif
+
+
+#ifdef NETNS_REFCNT_DEBUG
+static inline struct net *hold_net(struct net *net)
+{
+	if (net)
+		atomic_inc(&net->use_count);
+	return net;
+}
+
+static inline void release_net(struct net *net)
+{
+	if (net)
+		atomic_dec(&net->use_count);
+}
+#else
+static inline struct net *hold_net(struct net *net)
+{
+	return net;
+}
+
+static inline void release_net(struct net *net)
+{
+}
+#endif
+
+#ifdef CONFIG_NET_NS
+
+static inline void write_pnet(struct net **pnet, struct net *net)
+{
+	*pnet = net;
+}
+
+static inline struct net *read_pnet(struct net * const *pnet)
+{
+	return *pnet;
+}
+
+#else
+
+#define write_pnet(pnet, net)	do { (void)(net);} while (0)
+#define read_pnet(pnet)		(&init_net)
+
+#endif
+
+#define for_each_net(VAR)				\
+	list_for_each_entry(VAR, &net_namespace_list, list)
+
+#define for_each_net_rcu(VAR)				\
+	list_for_each_entry_rcu(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);
+	void (*exit_batch)(struct list_head *net_exit_list);
+	int *id;
+	size_t size;
+};
+
+/*
+ * Use these carefully.  If you implement a network device and it
+ * needs per network namespace operations use device pernet operations,
+ * otherwise use pernet subsys operations.
+ *
+ * Network interfaces need to be removed from a dying netns _before_
+ * subsys notifiers can be called, as most of the network code cleanup
+ * (which is done from subsys notifiers) runs with the assumption that
+ * dev_remove_pack has been called so no new packets will arrive during
+ * and after the cleanup functions have been called.  dev_remove_pack
+ * is not per namespace so instead the guarantee of no more packets
+ * arriving in a network namespace is provided by ensuring that all
+ * network devices and all sockets have left the network namespace
+ * before the cleanup methods are called.
+ *
+ * For the longest time the ipv4 icmp code was registered as a pernet
+ * device which caused kernel oops, and panics during network
+ * namespace cleanup.   So please don't get this wrong.
+ */
+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 *);
+
+struct ctl_path;
+struct ctl_table;
+struct ctl_table_header;
+
+extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
+	const struct ctl_path *path, struct ctl_table *table);
+extern struct ctl_table_header *register_net_sysctl_rotable(
+	const struct ctl_path *path, struct ctl_table *table);
+extern void unregister_net_sysctl_table(struct ctl_table_header *header);
+
+#endif /* __NET_NET_NAMESPACE_H */