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1/*
2 * Operations on the network namespace
3 */
4#ifndef __NET_NET_NAMESPACE_H
5#define __NET_NET_NAMESPACE_H
6
7#include <linux/atomic.h>
8#include <linux/workqueue.h>
9#include <linux/list.h>
10#include <linux/sysctl.h>
11
12#include <net/netns/core.h>
13#include <net/netns/mib.h>
14#include <net/netns/unix.h>
15#include <net/netns/packet.h>
16#include <net/netns/ipv4.h>
17#include <net/netns/ipv6.h>
18#include <net/netns/dccp.h>
19#include <net/netns/x_tables.h>
20#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
21#include <net/netns/conntrack.h>
22#endif
23#include <net/netns/xfrm.h>
24
25struct proc_dir_entry;
26struct net_device;
27struct sock;
28struct ctl_table_header;
29struct net_generic;
30struct sock;
31struct netns_ipvs;
32
33
34#define NETDEV_HASHBITS 8
35#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
36
37struct net {
38 atomic_t passive; /* To decided when the network
39 * namespace should be freed.
40 */
41 atomic_t count; /* To decided when the network
42 * namespace should be shut down.
43 */
44#ifdef NETNS_REFCNT_DEBUG
45 atomic_t use_count; /* To track references we
46 * destroy on demand
47 */
48#endif
49 spinlock_t rules_mod_lock;
50
51 struct list_head list; /* list of network namespaces */
52 struct list_head cleanup_list; /* namespaces on death row */
53 struct list_head exit_list; /* Use only net_mutex */
54
55 struct proc_dir_entry *proc_net;
56 struct proc_dir_entry *proc_net_stat;
57
58#ifdef CONFIG_SYSCTL
59 struct ctl_table_set sysctls;
60#endif
61
62 struct sock *rtnl; /* rtnetlink socket */
63 struct sock *genl_sock;
64
65 struct list_head dev_base_head;
66 struct hlist_head *dev_name_head;
67 struct hlist_head *dev_index_head;
68 unsigned int dev_base_seq; /* protected by rtnl_mutex */
69
70 /* core fib_rules */
71 struct list_head rules_ops;
72
73
74 struct net_device *loopback_dev; /* The loopback */
75 struct netns_core core;
76 struct netns_mib mib;
77 struct netns_packet packet;
78 struct netns_unix unx;
79 struct netns_ipv4 ipv4;
80#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
81 struct netns_ipv6 ipv6;
82#endif
83#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
84 struct netns_dccp dccp;
85#endif
86#ifdef CONFIG_NETFILTER
87 struct netns_xt xt;
88#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
89 struct netns_ct ct;
90#endif
91 struct sock *nfnl;
92 struct sock *nfnl_stash;
93#endif
94#ifdef CONFIG_WEXT_CORE
95 struct sk_buff_head wext_nlevents;
96#endif
97 struct net_generic __rcu *gen;
98
99 /* Note : following structs are cache line aligned */
100#ifdef CONFIG_XFRM
101 struct netns_xfrm xfrm;
102#endif
103 struct netns_ipvs *ipvs;
104};
105
106
107#include <linux/seq_file_net.h>
108
109/* Init's network namespace */
110extern struct net init_net;
111
112#ifdef CONFIG_NET
113extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
114
115#else /* CONFIG_NET */
116static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
117{
118 /* There is nothing to copy so this is a noop */
119 return net_ns;
120}
121#endif /* CONFIG_NET */
122
123
124extern struct list_head net_namespace_list;
125
126extern struct net *get_net_ns_by_pid(pid_t pid);
127extern struct net *get_net_ns_by_fd(int pid);
128
129#ifdef CONFIG_NET_NS
130extern void __put_net(struct net *net);
131
132static inline struct net *get_net(struct net *net)
133{
134 atomic_inc(&net->count);
135 return net;
136}
137
138static inline struct net *maybe_get_net(struct net *net)
139{
140 /* Used when we know struct net exists but we
141 * aren't guaranteed a previous reference count
142 * exists. If the reference count is zero this
143 * function fails and returns NULL.
144 */
145 if (!atomic_inc_not_zero(&net->count))
146 net = NULL;
147 return net;
148}
149
150static inline void put_net(struct net *net)
151{
152 if (atomic_dec_and_test(&net->count))
153 __put_net(net);
154}
155
156static inline
157int net_eq(const struct net *net1, const struct net *net2)
158{
159 return net1 == net2;
160}
161
162extern void net_drop_ns(void *);
163
164#else
165
166static inline struct net *get_net(struct net *net)
167{
168 return net;
169}
170
171static inline void put_net(struct net *net)
172{
173}
174
175static inline struct net *maybe_get_net(struct net *net)
176{
177 return net;
178}
179
180static inline
181int net_eq(const struct net *net1, const struct net *net2)
182{
183 return 1;
184}
185
186#define net_drop_ns NULL
187#endif
188
189
190#ifdef NETNS_REFCNT_DEBUG
191static inline struct net *hold_net(struct net *net)
192{
193 if (net)
194 atomic_inc(&net->use_count);
195 return net;
196}
197
198static inline void release_net(struct net *net)
199{
200 if (net)
201 atomic_dec(&net->use_count);
202}
203#else
204static inline struct net *hold_net(struct net *net)
205{
206 return net;
207}
208
209static inline void release_net(struct net *net)
210{
211}
212#endif
213
214#ifdef CONFIG_NET_NS
215
216static inline void write_pnet(struct net **pnet, struct net *net)
217{
218 *pnet = net;
219}
220
221static inline struct net *read_pnet(struct net * const *pnet)
222{
223 return *pnet;
224}
225
226#else
227
228#define write_pnet(pnet, net) do { (void)(net);} while (0)
229#define read_pnet(pnet) (&init_net)
230
231#endif
232
233#define for_each_net(VAR) \
234 list_for_each_entry(VAR, &net_namespace_list, list)
235
236#define for_each_net_rcu(VAR) \
237 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
238
239#ifdef CONFIG_NET_NS
240#define __net_init
241#define __net_exit
242#define __net_initdata
243#else
244#define __net_init __init
245#define __net_exit __exit_refok
246#define __net_initdata __initdata
247#endif
248
249struct pernet_operations {
250 struct list_head list;
251 int (*init)(struct net *net);
252 void (*exit)(struct net *net);
253 void (*exit_batch)(struct list_head *net_exit_list);
254 int *id;
255 size_t size;
256};
257
258/*
259 * Use these carefully. If you implement a network device and it
260 * needs per network namespace operations use device pernet operations,
261 * otherwise use pernet subsys operations.
262 *
263 * Network interfaces need to be removed from a dying netns _before_
264 * subsys notifiers can be called, as most of the network code cleanup
265 * (which is done from subsys notifiers) runs with the assumption that
266 * dev_remove_pack has been called so no new packets will arrive during
267 * and after the cleanup functions have been called. dev_remove_pack
268 * is not per namespace so instead the guarantee of no more packets
269 * arriving in a network namespace is provided by ensuring that all
270 * network devices and all sockets have left the network namespace
271 * before the cleanup methods are called.
272 *
273 * For the longest time the ipv4 icmp code was registered as a pernet
274 * device which caused kernel oops, and panics during network
275 * namespace cleanup. So please don't get this wrong.
276 */
277extern int register_pernet_subsys(struct pernet_operations *);
278extern void unregister_pernet_subsys(struct pernet_operations *);
279extern int register_pernet_device(struct pernet_operations *);
280extern void unregister_pernet_device(struct pernet_operations *);
281
282struct ctl_path;
283struct ctl_table;
284struct ctl_table_header;
285
286extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
287 const struct ctl_path *path, struct ctl_table *table);
288extern struct ctl_table_header *register_net_sysctl_rotable(
289 const struct ctl_path *path, struct ctl_table *table);
290extern void unregister_net_sysctl_table(struct ctl_table_header *header);
291
292#endif /* __NET_NET_NAMESPACE_H */
1/*
2 * Operations on the network namespace
3 */
4#ifndef __NET_NET_NAMESPACE_H
5#define __NET_NET_NAMESPACE_H
6
7#include <linux/atomic.h>
8#include <linux/workqueue.h>
9#include <linux/list.h>
10#include <linux/sysctl.h>
11
12#include <net/flow.h>
13#include <net/netns/core.h>
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#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
25#include <net/netns/conntrack.h>
26#endif
27#include <net/netns/nftables.h>
28#include <net/netns/xfrm.h>
29
30struct user_namespace;
31struct proc_dir_entry;
32struct net_device;
33struct sock;
34struct ctl_table_header;
35struct net_generic;
36struct sock;
37struct netns_ipvs;
38
39
40#define NETDEV_HASHBITS 8
41#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
42
43struct net {
44 atomic_t passive; /* To decided when the network
45 * namespace should be freed.
46 */
47 atomic_t count; /* To decided when the network
48 * namespace should be shut down.
49 */
50#ifdef NETNS_REFCNT_DEBUG
51 atomic_t use_count; /* To track references we
52 * destroy on demand
53 */
54#endif
55 spinlock_t rules_mod_lock;
56
57 struct list_head list; /* list of network namespaces */
58 struct list_head cleanup_list; /* namespaces on death row */
59 struct list_head exit_list; /* Use only net_mutex */
60
61 struct user_namespace *user_ns; /* Owning user namespace */
62
63 unsigned int proc_inum;
64
65 struct proc_dir_entry *proc_net;
66 struct proc_dir_entry *proc_net_stat;
67
68#ifdef CONFIG_SYSCTL
69 struct ctl_table_set sysctls;
70#endif
71
72 struct sock *rtnl; /* rtnetlink socket */
73 struct sock *genl_sock;
74
75 struct list_head dev_base_head;
76 struct hlist_head *dev_name_head;
77 struct hlist_head *dev_index_head;
78 unsigned int dev_base_seq; /* protected by rtnl_mutex */
79 int ifindex;
80 unsigned int dev_unreg_count;
81
82 /* core fib_rules */
83 struct list_head rules_ops;
84
85
86 struct net_device *loopback_dev; /* The loopback */
87 struct netns_core core;
88 struct netns_mib mib;
89 struct netns_packet packet;
90 struct netns_unix unx;
91 struct netns_ipv4 ipv4;
92#if IS_ENABLED(CONFIG_IPV6)
93 struct netns_ipv6 ipv6;
94#endif
95#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
96 struct netns_ieee802154_lowpan ieee802154_lowpan;
97#endif
98#if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
99 struct netns_sctp sctp;
100#endif
101#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
102 struct netns_dccp dccp;
103#endif
104#ifdef CONFIG_NETFILTER
105 struct netns_nf nf;
106 struct netns_xt xt;
107#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
108 struct netns_ct ct;
109#endif
110#if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
111 struct netns_nftables nft;
112#endif
113#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
114 struct netns_nf_frag nf_frag;
115#endif
116 struct sock *nfnl;
117 struct sock *nfnl_stash;
118#endif
119#ifdef CONFIG_WEXT_CORE
120 struct sk_buff_head wext_nlevents;
121#endif
122 struct net_generic __rcu *gen;
123
124 /* Note : following structs are cache line aligned */
125#ifdef CONFIG_XFRM
126 struct netns_xfrm xfrm;
127#endif
128#if IS_ENABLED(CONFIG_IP_VS)
129 struct netns_ipvs *ipvs;
130#endif
131 struct sock *diag_nlsk;
132 atomic_t fnhe_genid;
133};
134
135#include <linux/seq_file_net.h>
136
137/* Init's network namespace */
138extern struct net init_net;
139
140#ifdef CONFIG_NET_NS
141struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
142 struct net *old_net);
143
144#else /* CONFIG_NET_NS */
145#include <linux/sched.h>
146#include <linux/nsproxy.h>
147static inline struct net *copy_net_ns(unsigned long flags,
148 struct user_namespace *user_ns, struct net *old_net)
149{
150 if (flags & CLONE_NEWNET)
151 return ERR_PTR(-EINVAL);
152 return old_net;
153}
154#endif /* CONFIG_NET_NS */
155
156
157extern struct list_head net_namespace_list;
158
159struct net *get_net_ns_by_pid(pid_t pid);
160struct net *get_net_ns_by_fd(int pid);
161
162#ifdef CONFIG_SYSCTL
163void ipx_register_sysctl(void);
164void ipx_unregister_sysctl(void);
165#else
166#define ipx_register_sysctl()
167#define ipx_unregister_sysctl()
168#endif
169
170#ifdef CONFIG_NET_NS
171void __put_net(struct net *net);
172
173static inline struct net *get_net(struct net *net)
174{
175 atomic_inc(&net->count);
176 return net;
177}
178
179static inline struct net *maybe_get_net(struct net *net)
180{
181 /* Used when we know struct net exists but we
182 * aren't guaranteed a previous reference count
183 * exists. If the reference count is zero this
184 * function fails and returns NULL.
185 */
186 if (!atomic_inc_not_zero(&net->count))
187 net = NULL;
188 return net;
189}
190
191static inline void put_net(struct net *net)
192{
193 if (atomic_dec_and_test(&net->count))
194 __put_net(net);
195}
196
197static inline
198int net_eq(const struct net *net1, const struct net *net2)
199{
200 return net1 == net2;
201}
202
203void net_drop_ns(void *);
204
205#else
206
207static inline struct net *get_net(struct net *net)
208{
209 return net;
210}
211
212static inline void put_net(struct net *net)
213{
214}
215
216static inline struct net *maybe_get_net(struct net *net)
217{
218 return net;
219}
220
221static inline
222int net_eq(const struct net *net1, const struct net *net2)
223{
224 return 1;
225}
226
227#define net_drop_ns NULL
228#endif
229
230
231#ifdef NETNS_REFCNT_DEBUG
232static inline struct net *hold_net(struct net *net)
233{
234 if (net)
235 atomic_inc(&net->use_count);
236 return net;
237}
238
239static inline void release_net(struct net *net)
240{
241 if (net)
242 atomic_dec(&net->use_count);
243}
244#else
245static inline struct net *hold_net(struct net *net)
246{
247 return net;
248}
249
250static inline void release_net(struct net *net)
251{
252}
253#endif
254
255#ifdef CONFIG_NET_NS
256
257static inline void write_pnet(struct net **pnet, struct net *net)
258{
259 *pnet = net;
260}
261
262static inline struct net *read_pnet(struct net * const *pnet)
263{
264 return *pnet;
265}
266
267#else
268
269#define write_pnet(pnet, net) do { (void)(net);} while (0)
270#define read_pnet(pnet) (&init_net)
271
272#endif
273
274#define for_each_net(VAR) \
275 list_for_each_entry(VAR, &net_namespace_list, list)
276
277#define for_each_net_rcu(VAR) \
278 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
279
280#ifdef CONFIG_NET_NS
281#define __net_init
282#define __net_exit
283#define __net_initdata
284#define __net_initconst
285#else
286#define __net_init __init
287#define __net_exit __exit_refok
288#define __net_initdata __initdata
289#define __net_initconst __initconst
290#endif
291
292struct pernet_operations {
293 struct list_head list;
294 int (*init)(struct net *net);
295 void (*exit)(struct net *net);
296 void (*exit_batch)(struct list_head *net_exit_list);
297 int *id;
298 size_t size;
299};
300
301/*
302 * Use these carefully. If you implement a network device and it
303 * needs per network namespace operations use device pernet operations,
304 * otherwise use pernet subsys operations.
305 *
306 * Network interfaces need to be removed from a dying netns _before_
307 * subsys notifiers can be called, as most of the network code cleanup
308 * (which is done from subsys notifiers) runs with the assumption that
309 * dev_remove_pack has been called so no new packets will arrive during
310 * and after the cleanup functions have been called. dev_remove_pack
311 * is not per namespace so instead the guarantee of no more packets
312 * arriving in a network namespace is provided by ensuring that all
313 * network devices and all sockets have left the network namespace
314 * before the cleanup methods are called.
315 *
316 * For the longest time the ipv4 icmp code was registered as a pernet
317 * device which caused kernel oops, and panics during network
318 * namespace cleanup. So please don't get this wrong.
319 */
320int register_pernet_subsys(struct pernet_operations *);
321void unregister_pernet_subsys(struct pernet_operations *);
322int register_pernet_device(struct pernet_operations *);
323void unregister_pernet_device(struct pernet_operations *);
324
325struct ctl_table;
326struct ctl_table_header;
327
328#ifdef CONFIG_SYSCTL
329int net_sysctl_init(void);
330struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
331 struct ctl_table *table);
332void unregister_net_sysctl_table(struct ctl_table_header *header);
333#else
334static inline int net_sysctl_init(void) { return 0; }
335static inline struct ctl_table_header *register_net_sysctl(struct net *net,
336 const char *path, struct ctl_table *table)
337{
338 return NULL;
339}
340static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
341{
342}
343#endif
344
345static inline int rt_genid_ipv4(struct net *net)
346{
347 return atomic_read(&net->ipv4.rt_genid);
348}
349
350static inline void rt_genid_bump_ipv4(struct net *net)
351{
352 atomic_inc(&net->ipv4.rt_genid);
353}
354
355#if IS_ENABLED(CONFIG_IPV6)
356static inline int rt_genid_ipv6(struct net *net)
357{
358 return atomic_read(&net->ipv6.rt_genid);
359}
360
361static inline void rt_genid_bump_ipv6(struct net *net)
362{
363 atomic_inc(&net->ipv6.rt_genid);
364}
365#else
366static inline int rt_genid_ipv6(struct net *net)
367{
368 return 0;
369}
370
371static inline void rt_genid_bump_ipv6(struct net *net)
372{
373}
374#endif
375
376/* For callers who don't really care about whether it's IPv4 or IPv6 */
377static inline void rt_genid_bump_all(struct net *net)
378{
379 rt_genid_bump_ipv4(net);
380 rt_genid_bump_ipv6(net);
381}
382
383static inline int fnhe_genid(struct net *net)
384{
385 return atomic_read(&net->fnhe_genid);
386}
387
388static inline void fnhe_genid_bump(struct net *net)
389{
390 atomic_inc(&net->fnhe_genid);
391}
392
393#endif /* __NET_NET_NAMESPACE_H */