net_namespace.h 6.46 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 21
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
#include <net/netns/conntrack.h>
#endif
22
#include <net/netns/xfrm.h>
23

24
struct proc_dir_entry;
25
struct net_device;
26
struct sock;
27
struct ctl_table_header;
28
struct net_generic;
Johannes Berg's avatar
Johannes Berg committed
29
struct sock;
30

31 32 33 34

#define NETDEV_HASHBITS    8
#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)

35 36 37 38
struct net {
	atomic_t		count;		/* To decided when the network
						 *  namespace should be freed.
						 */
39
#ifdef NETNS_REFCNT_DEBUG
40 41 42
	atomic_t		use_count;	/* To track references we
						 * destroy on demand
						 */
43
#endif
44
	struct list_head	list;		/* list of network namespaces */
45
	struct list_head	cleanup_list;	/* namespaces on death row */
46
	struct list_head	exit_list;	/* Use only net_mutex */
47 48 49

	struct proc_dir_entry 	*proc_net;
	struct proc_dir_entry 	*proc_net_stat;
50

51 52 53
#ifdef CONFIG_SYSCTL
	struct ctl_table_set	sysctls;
#endif
54

55 56
	struct net_device       *loopback_dev;          /* The loopback */

57 58 59
	struct list_head 	dev_base_head;
	struct hlist_head 	*dev_name_head;
	struct hlist_head	*dev_index_head;
60

61 62 63 64
	/* core fib_rules */
	struct list_head	rules_ops;
	spinlock_t		rules_mod_lock;

65
	struct sock 		*rtnl;			/* rtnetlink socket */
Johannes Berg's avatar
Johannes Berg committed
66
	struct sock		*genl_sock;
67

68
	struct netns_core	core;
Pavel Emelyanov's avatar
Pavel Emelyanov committed
69
	struct netns_mib	mib;
70
	struct netns_packet	packet;
71
	struct netns_unix	unx;
72
	struct netns_ipv4	ipv4;
73 74 75
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	struct netns_ipv6	ipv6;
#endif
76 77 78
#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
	struct netns_dccp	dccp;
#endif
79 80
#ifdef CONFIG_NETFILTER
	struct netns_xt		xt;
81 82 83
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
	struct netns_ct		ct;
#endif
84 85
	struct sock		*nfnl;
	struct sock		*nfnl_stash;
86 87 88
#endif
#ifdef CONFIG_XFRM
	struct netns_xfrm	xfrm;
89
#endif
Johannes Berg's avatar
Johannes Berg committed
90
#ifdef CONFIG_WEXT_CORE
91
	struct sk_buff_head	wext_nlevents;
92
#endif
93
	struct net_generic	*gen;
94 95
};

96

97 98
#include <linux/seq_file_net.h>

99
/* Init's network namespace */
100
extern struct net init_net;
101 102

#ifdef CONFIG_NET
103
extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
104 105

#else /* CONFIG_NET */
106 107 108 109 110
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;
}
111 112 113 114
#endif /* CONFIG_NET */


extern struct list_head net_namespace_list;
115

116 117
extern struct net *get_net_ns_by_pid(pid_t pid);

118
#ifdef CONFIG_NET_NS
119 120 121 122 123 124 125 126
extern void __put_net(struct net *net);

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

127 128 129 130 131 132 133 134 135 136 137 138
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;
}

139 140 141 142 143 144
static inline void put_net(struct net *net)
{
	if (atomic_dec_and_test(&net->count))
		__put_net(net);
}

145 146 147 148 149
static inline
int net_eq(const struct net *net1, const struct net *net2)
{
	return net1 == net2;
}
150
#else
151

152 153 154 155 156 157 158 159 160
static inline struct net *get_net(struct net *net)
{
	return net;
}

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

161 162 163 164 165 166 167 168 169 170 171 172 173 174
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
175 176
static inline struct net *hold_net(struct net *net)
{
177 178
	if (net)
		atomic_inc(&net->use_count);
179 180 181 182 183
	return net;
}

static inline void release_net(struct net *net)
{
184 185
	if (net)
		atomic_dec(&net->use_count);
186
}
187 188
#else
static inline struct net *hold_net(struct net *net)
189 190 191
{
	return net;
}
192

193
static inline void release_net(struct net *net)
194 195
{
}
196
#endif
197

198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215
#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
216

217 218 219
#define for_each_net(VAR)				\
	list_for_each_entry(VAR, &net_namespace_list, list)

220 221 222
#define for_each_net_rcu(VAR)				\
	list_for_each_entry_rcu(VAR, &net_namespace_list, list)

223 224 225
#ifdef CONFIG_NET_NS
#define __net_init
#define __net_exit
226
#define __net_initdata
227 228 229
#else
#define __net_init	__init
#define __net_exit	__exit_refok
230
#define __net_initdata	__initdata
231
#endif
232 233 234 235 236

struct pernet_operations {
	struct list_head list;
	int (*init)(struct net *net);
	void (*exit)(struct net *net);
237
	void (*exit_batch)(struct list_head *net_exit_list);
238 239
	int *id;
	size_t size;
240 241
};

Eric W. Biederman's avatar
Eric W. Biederman committed
242 243 244 245 246
/*
 * 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.
 *
247 248 249 250 251 252 253 254 255
 * 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.
Eric W. Biederman's avatar
Eric W. Biederman committed
256 257 258 259 260
 *
 * 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.
 */
261 262 263 264
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 *);
265

266 267 268
struct ctl_path;
struct ctl_table;
struct ctl_table_header;
269

270 271
extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
	const struct ctl_path *path, struct ctl_table *table);
272 273
extern struct ctl_table_header *register_net_sysctl_rotable(
	const struct ctl_path *path, struct ctl_table *table);
274 275
extern void unregister_net_sysctl_table(struct ctl_table_header *header);

276
#endif /* __NET_NET_NAMESPACE_H */