net_namespace.h 9.18 KB
Newer Older
1 2 3 4 5 6
/*
 * Operations on the network namespace
 */
#ifndef __NET_NET_NAMESPACE_H
#define __NET_NET_NAMESPACE_H

Arun Sharma's avatar
Arun Sharma committed
7
#include <linux/atomic.h>
8 9
#include <linux/workqueue.h>
#include <linux/list.h>
10
#include <linux/sysctl.h>
11

12
#include <net/flow.h>
13
#include <net/netns/core.h>
Pavel Emelyanov's avatar
Pavel Emelyanov committed
14
#include <net/netns/mib.h>
15
#include <net/netns/unix.h>
16
#include <net/netns/packet.h>
17
#include <net/netns/ipv4.h>
18
#include <net/netns/ipv6.h>
19
#include <net/netns/ieee802154_6lowpan.h>
20
#include <net/netns/sctp.h>
21
#include <net/netns/dccp.h>
22
#include <net/netns/netfilter.h>
23
#include <net/netns/x_tables.h>
24 25 26
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
#include <net/netns/conntrack.h>
#endif
27
#include <net/netns/nftables.h>
28
#include <net/netns/xfrm.h>
29
#include <net/netns/mpls.h>
30
#include <linux/ns_common.h>
31

32
struct user_namespace;
33
struct proc_dir_entry;
34
struct net_device;
35
struct sock;
36
struct ctl_table_header;
37
struct net_generic;
Johannes Berg's avatar
Johannes Berg committed
38
struct sock;
39
struct netns_ipvs;
40

41 42 43 44

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

45
struct net {
46 47 48
	atomic_t		passive;	/* To decided when the network
						 * namespace should be freed.
						 */
49
	atomic_t		count;		/* To decided when the network
50
						 *  namespace should be shut down.
51
						 */
52
#ifdef NETNS_REFCNT_DEBUG
53 54 55
	atomic_t		use_count;	/* To track references we
						 * destroy on demand
						 */
56
#endif
57 58
	spinlock_t		rules_mod_lock;

59
	struct list_head	list;		/* list of network namespaces */
60
	struct list_head	cleanup_list;	/* namespaces on death row */
61
	struct list_head	exit_list;	/* Use only net_mutex */
62

63
	struct user_namespace   *user_ns;	/* Owning user namespace */
64
	struct idr		netns_ids;
65

66
	struct ns_common	ns;
67

68 69
	struct proc_dir_entry 	*proc_net;
	struct proc_dir_entry 	*proc_net_stat;
70

71 72 73
#ifdef CONFIG_SYSCTL
	struct ctl_table_set	sysctls;
#endif
74

75 76
	struct sock 		*rtnl;			/* rtnetlink socket */
	struct sock		*genl_sock;
77

78 79 80
	struct list_head 	dev_base_head;
	struct hlist_head 	*dev_name_head;
	struct hlist_head	*dev_index_head;
81
	unsigned int		dev_base_seq;	/* protected by rtnl_mutex */
82
	int			ifindex;
83
	unsigned int		dev_unreg_count;
84

85 86 87
	/* core fib_rules */
	struct list_head	rules_ops;

88

89
	struct net_device       *loopback_dev;          /* The loopback */
90
	struct netns_core	core;
Pavel Emelyanov's avatar
Pavel Emelyanov committed
91
	struct netns_mib	mib;
92
	struct netns_packet	packet;
93
	struct netns_unix	unx;
94
	struct netns_ipv4	ipv4;
95
#if IS_ENABLED(CONFIG_IPV6)
96 97
	struct netns_ipv6	ipv6;
#endif
98 99 100
#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
	struct netns_ieee802154_lowpan	ieee802154_lowpan;
#endif
101 102 103
#if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
	struct netns_sctp	sctp;
#endif
104 105 106
#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
	struct netns_dccp	dccp;
#endif
107
#ifdef CONFIG_NETFILTER
108
	struct netns_nf		nf;
109
	struct netns_xt		xt;
110 111
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
	struct netns_ct		ct;
112
#endif
113 114 115
#if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
	struct netns_nftables	nft;
#endif
116 117
#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
	struct netns_nf_frag	nf_frag;
118
#endif
119 120
	struct sock		*nfnl;
	struct sock		*nfnl_stash;
121
#endif
Johannes Berg's avatar
Johannes Berg committed
122
#ifdef CONFIG_WEXT_CORE
123
	struct sk_buff_head	wext_nlevents;
124
#endif
Eric Dumazet's avatar
Eric Dumazet committed
125
	struct net_generic __rcu	*gen;
126 127 128 129 130

	/* Note : following structs are cache line aligned */
#ifdef CONFIG_XFRM
	struct netns_xfrm	xfrm;
#endif
131
#if IS_ENABLED(CONFIG_IP_VS)
132
	struct netns_ipvs	*ipvs;
133 134 135
#endif
#if IS_ENABLED(CONFIG_MPLS)
	struct netns_mpls	mpls;
136
#endif
137
	struct sock		*diag_nlsk;
138
	atomic_t		fnhe_genid;
139 140
};

141 142
#include <linux/seq_file_net.h>

143
/* Init's network namespace */
144
extern struct net init_net;
145

146
#ifdef CONFIG_NET_NS
147 148
struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
			struct net *old_net);
149

150 151 152
#else /* CONFIG_NET_NS */
#include <linux/sched.h>
#include <linux/nsproxy.h>
153 154
static inline struct net *copy_net_ns(unsigned long flags,
	struct user_namespace *user_ns, struct net *old_net)
155
{
156 157 158
	if (flags & CLONE_NEWNET)
		return ERR_PTR(-EINVAL);
	return old_net;
159
}
160
#endif /* CONFIG_NET_NS */
161 162 163


extern struct list_head net_namespace_list;
164

165 166
struct net *get_net_ns_by_pid(pid_t pid);
struct net *get_net_ns_by_fd(int pid);
167

168 169 170 171 172 173 174 175
#ifdef CONFIG_SYSCTL
void ipx_register_sysctl(void);
void ipx_unregister_sysctl(void);
#else
#define ipx_register_sysctl()
#define ipx_unregister_sysctl()
#endif

176
#ifdef CONFIG_NET_NS
177
void __put_net(struct net *net);
178 179 180 181 182 183 184

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

185 186 187 188 189 190 191 192 193 194 195 196
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;
}

197 198 199 200 201 202
static inline void put_net(struct net *net)
{
	if (atomic_dec_and_test(&net->count))
		__put_net(net);
}

203 204 205 206 207
static inline
int net_eq(const struct net *net1, const struct net *net2)
{
	return net1 == net2;
}
208

209
void net_drop_ns(void *);
210

211
#else
212

213 214 215 216 217 218 219 220 221
static inline struct net *get_net(struct net *net)
{
	return net;
}

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

222 223 224 225 226 227 228 229 230 231
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;
}
232 233

#define net_drop_ns NULL
234 235 236 237
#endif


#ifdef NETNS_REFCNT_DEBUG
238 239
static inline struct net *hold_net(struct net *net)
{
240 241
	if (net)
		atomic_inc(&net->use_count);
242 243 244 245 246
	return net;
}

static inline void release_net(struct net *net)
{
247 248
	if (net)
		atomic_dec(&net->use_count);
249
}
250 251
#else
static inline struct net *hold_net(struct net *net)
252 253 254
{
	return net;
}
255

256
static inline void release_net(struct net *net)
257 258
{
}
259
#endif
260

261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278
#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
279

280 281 282
#define for_each_net(VAR)				\
	list_for_each_entry(VAR, &net_namespace_list, list)

283 284 285
#define for_each_net_rcu(VAR)				\
	list_for_each_entry_rcu(VAR, &net_namespace_list, list)

286 287 288
#ifdef CONFIG_NET_NS
#define __net_init
#define __net_exit
289
#define __net_initdata
290
#define __net_initconst
291 292 293
#else
#define __net_init	__init
#define __net_exit	__exit_refok
294
#define __net_initdata	__initdata
295
#define __net_initconst	__initconst
296
#endif
297

298 299 300
int peernet2id(struct net *net, struct net *peer);
struct net *get_net_ns_by_id(struct net *net, int id);

301 302 303 304
struct pernet_operations {
	struct list_head list;
	int (*init)(struct net *net);
	void (*exit)(struct net *net);
305
	void (*exit_batch)(struct list_head *net_exit_list);
306 307
	int *id;
	size_t size;
308 309
};

Eric W. Biederman's avatar
Eric W. Biederman committed
310 311 312 313 314
/*
 * 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.
 *
315 316 317 318 319 320 321 322 323
 * 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
324 325 326 327 328
 *
 * 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.
 */
329 330 331 332
int register_pernet_subsys(struct pernet_operations *);
void unregister_pernet_subsys(struct pernet_operations *);
int register_pernet_device(struct pernet_operations *);
void unregister_pernet_device(struct pernet_operations *);
333

334 335
struct ctl_table;
struct ctl_table_header;
336

337
#ifdef CONFIG_SYSCTL
338 339 340 341
int net_sysctl_init(void);
struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
					     struct ctl_table *table);
void unregister_net_sysctl_table(struct ctl_table_header *header);
342 343 344 345 346 347 348 349 350 351 352 353
#else
static inline int net_sysctl_init(void) { return 0; }
static inline struct ctl_table_header *register_net_sysctl(struct net *net,
	const char *path, struct ctl_table *table)
{
	return NULL;
}
static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
{
}
#endif

fan.du's avatar
fan.du committed
354
static inline int rt_genid_ipv4(struct net *net)
355
{
fan.du's avatar
fan.du committed
356
	return atomic_read(&net->ipv4.rt_genid);
357 358
}

fan.du's avatar
fan.du committed
359
static inline void rt_genid_bump_ipv4(struct net *net)
360
{
fan.du's avatar
fan.du committed
361 362 363
	atomic_inc(&net->ipv4.rt_genid);
}

Hannes Frederic Sowa's avatar
Hannes Frederic Sowa committed
364
extern void (*__fib6_flush_trees)(struct net *net);
fan.du's avatar
fan.du committed
365 366
static inline void rt_genid_bump_ipv6(struct net *net)
{
Hannes Frederic Sowa's avatar
Hannes Frederic Sowa committed
367 368
	if (__fib6_flush_trees)
		__fib6_flush_trees(net);
fan.du's avatar
fan.du committed
369 370
}

371 372 373 374 375 376 377 378
#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
static inline struct netns_ieee802154_lowpan *
net_ieee802154_lowpan(struct net *net)
{
	return &net->ieee802154_lowpan;
}
#endif

fan.du's avatar
fan.du committed
379 380 381 382 383
/* For callers who don't really care about whether it's IPv4 or IPv6 */
static inline void rt_genid_bump_all(struct net *net)
{
	rt_genid_bump_ipv4(net);
	rt_genid_bump_ipv6(net);
384
}
385

386 387 388 389 390 391 392 393 394 395
static inline int fnhe_genid(struct net *net)
{
	return atomic_read(&net->fnhe_genid);
}

static inline void fnhe_genid_bump(struct net *net)
{
	atomic_inc(&net->fnhe_genid);
}

396
#endif /* __NET_NET_NAMESPACE_H */