net_namespace.h 4.06 KB
Newer Older
1 2 3 4 5 6 7 8 9 10
/*
 * 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>

11
#include <net/netns/core.h>
12
#include <net/netns/unix.h>
13
#include <net/netns/packet.h>
14
#include <net/netns/ipv4.h>
15
#include <net/netns/ipv6.h>
16
#include <net/netns/x_tables.h>
17

18
struct proc_dir_entry;
19
struct net_device;
20
struct sock;
21 22
struct ctl_table_header;

23 24 25 26 27 28 29 30 31
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 */
32 33 34

	struct proc_dir_entry 	*proc_net;
	struct proc_dir_entry 	*proc_net_stat;
35

36 37
	struct list_head	sysctl_table_headers;

38 39
	struct net_device       *loopback_dev;          /* The loopback */

40 41 42
	struct list_head 	dev_base_head;
	struct hlist_head 	*dev_name_head;
	struct hlist_head	*dev_index_head;
43

44 45 46 47
	/* core fib_rules */
	struct list_head	rules_ops;
	spinlock_t		rules_mod_lock;

48
	struct sock 		*rtnl;			/* rtnetlink socket */
49

50
	struct netns_core	core;
51
	struct netns_packet	packet;
52
	struct netns_unix	unx;
53
	struct netns_ipv4	ipv4;
54 55 56
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	struct netns_ipv6	ipv6;
#endif
57 58 59
#ifdef CONFIG_NETFILTER
	struct netns_xt		xt;
#endif
60 61
};

62

63
#ifdef CONFIG_NET
64 65
#include <linux/seq_file_net.h>

66
/* Init's network namespace */
67
extern struct net init_net;
68 69
#define INIT_NET_NS(net_ns) .net_ns = &init_net,

70
extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
71 72 73 74 75

#else /* CONFIG_NET */

#define INIT_NET_NS(net_ns)

76 77 78 79 80
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;
}
81 82 83 84
#endif /* CONFIG_NET */


extern struct list_head net_namespace_list;
85

86
#ifdef CONFIG_NET_NS
87 88 89 90 91 92 93 94
extern void __put_net(struct net *net);

static inline struct net *get_net(struct net *net)
{
	atomic_inc(&net->count);
	return net;
}

95 96 97 98 99 100 101 102 103 104 105 106
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;
}

107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122
static inline void put_net(struct net *net)
{
	if (atomic_dec_and_test(&net->count))
		__put_net(net);
}

static inline struct net *hold_net(struct net *net)
{
	atomic_inc(&net->use_count);
	return net;
}

static inline void release_net(struct net *net)
{
	atomic_dec(&net->use_count);
}
123 124 125 126 127 128

static inline
int net_eq(const struct net *net1, const struct net *net2)
{
	return net1 == net2;
}
129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151
#else
static inline struct net *get_net(struct net *net)
{
	return net;
}

static inline void put_net(struct net *net)
{
}

static inline struct net *hold_net(struct net *net)
{
	return net;
}

static inline void release_net(struct net *net)
{
}

static inline struct net *maybe_get_net(struct net *net)
{
	return net;
}
152 153 154 155 156 157

static inline
int net_eq(const struct net *net1, const struct net *net2)
{
	return 1;
}
158
#endif
159 160 161 162

#define for_each_net(VAR)				\
	list_for_each_entry(VAR, &net_namespace_list, list)

163 164 165
#ifdef CONFIG_NET_NS
#define __net_init
#define __net_exit
166
#define __net_initdata
167 168 169
#else
#define __net_init	__init
#define __net_exit	__exit_refok
170
#define __net_initdata	__initdata
171
#endif
172 173 174 175 176 177 178 179 180 181 182 183

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 *);

184 185 186 187 188 189 190
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 void unregister_net_sysctl_table(struct ctl_table_header *header);

191
#endif /* __NET_NET_NAMESPACE_H */