net_namespace.h 4.78 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>
Pavel Emelyanov's avatar
Pavel Emelyanov committed
12
#include <net/netns/mib.h>
13
#include <net/netns/unix.h>
14
#include <net/netns/packet.h>
15
#include <net/netns/ipv4.h>
16
#include <net/netns/ipv6.h>
17
#include <net/netns/dccp.h>
18
#include <net/netns/x_tables.h>
19

20
struct proc_dir_entry;
21
struct net_device;
22
struct sock;
23
struct ctl_table_header;
24
struct net_generic;
25

26 27 28 29
struct net {
	atomic_t		count;		/* To decided when the network
						 *  namespace should be freed.
						 */
30
#ifdef NETNS_REFCNT_DEBUG
31 32 33
	atomic_t		use_count;	/* To track references we
						 * destroy on demand
						 */
34
#endif
35 36
	struct list_head	list;		/* list of network namespaces */
	struct work_struct	work;		/* work struct for freeing */
37 38 39

	struct proc_dir_entry 	*proc_net;
	struct proc_dir_entry 	*proc_net_stat;
40

41 42
	struct list_head	sysctl_table_headers;

43 44
	struct net_device       *loopback_dev;          /* The loopback */

45 46 47
	struct list_head 	dev_base_head;
	struct hlist_head 	*dev_name_head;
	struct hlist_head	*dev_index_head;
48

49 50 51 52
	/* core fib_rules */
	struct list_head	rules_ops;
	spinlock_t		rules_mod_lock;

53
	struct sock 		*rtnl;			/* rtnetlink socket */
54

55
	struct netns_core	core;
Pavel Emelyanov's avatar
Pavel Emelyanov committed
56
	struct netns_mib	mib;
57
	struct netns_packet	packet;
58
	struct netns_unix	unx;
59
	struct netns_ipv4	ipv4;
60 61 62
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	struct netns_ipv6	ipv6;
#endif
63 64 65
#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
	struct netns_dccp	dccp;
#endif
66 67 68
#ifdef CONFIG_NETFILTER
	struct netns_xt		xt;
#endif
69
	struct net_generic	*gen;
70 71
};

72

73 74
#include <linux/seq_file_net.h>

75
/* Init's network namespace */
76
extern struct net init_net;
77 78

#ifdef CONFIG_NET
79 80
#define INIT_NET_NS(net_ns) .net_ns = &init_net,

81
extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
82 83 84 85 86

#else /* CONFIG_NET */

#define INIT_NET_NS(net_ns)

87 88 89 90 91
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;
}
92 93 94 95
#endif /* CONFIG_NET */


extern struct list_head net_namespace_list;
96

97
#ifdef CONFIG_NET_NS
98 99
extern void __put_net(struct net *net);

100 101 102 103 104
static inline int net_alive(struct net *net)
{
	return net && atomic_read(&net->count);
}

105 106 107 108 109 110
static inline struct net *get_net(struct net *net)
{
	atomic_inc(&net->count);
	return net;
}

111 112 113 114 115 116 117 118 119 120 121 122
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;
}

123 124 125 126 127 128
static inline void put_net(struct net *net)
{
	if (atomic_dec_and_test(&net->count))
		__put_net(net);
}

129 130 131 132 133
static inline
int net_eq(const struct net *net1, const struct net *net2)
{
	return net1 == net2;
}
134
#else
135 136 137 138 139 140

static inline int net_alive(struct net *net)
{
	return 1;
}

141 142 143 144 145 146 147 148 149
static inline struct net *get_net(struct net *net)
{
	return net;
}

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

150 151 152 153 154 155 156 157 158 159 160 161 162 163
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;
}
#endif


#ifdef NETNS_REFCNT_DEBUG
164 165
static inline struct net *hold_net(struct net *net)
{
166 167
	if (net)
		atomic_inc(&net->use_count);
168 169 170 171 172
	return net;
}

static inline void release_net(struct net *net)
{
173 174
	if (net)
		atomic_dec(&net->use_count);
175
}
176 177
#else
static inline struct net *hold_net(struct net *net)
178 179 180
{
	return net;
}
181

182
static inline void release_net(struct net *net)
183 184
{
}
185
#endif
186

187

188 189 190
#define for_each_net(VAR)				\
	list_for_each_entry(VAR, &net_namespace_list, list)

191 192 193
#ifdef CONFIG_NET_NS
#define __net_init
#define __net_exit
194
#define __net_initdata
195 196 197
#else
#define __net_init	__init
#define __net_exit	__exit_refok
198
#define __net_initdata	__initdata
199
#endif
200 201 202 203 204 205 206 207 208 209 210

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 *);
211 212
extern int register_pernet_gen_device(int *id, struct pernet_operations *);
extern void unregister_pernet_gen_device(int id, struct pernet_operations *);
213

214 215 216
struct ctl_path;
struct ctl_table;
struct ctl_table_header;
217

218 219
extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
	const struct ctl_path *path, struct ctl_table *table);
220 221
extern struct ctl_table_header *register_net_sysctl_rotable(
	const struct ctl_path *path, struct ctl_table *table);
222 223
extern void unregister_net_sysctl_table(struct ctl_table_header *header);

224
#endif /* __NET_NET_NAMESPACE_H */