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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#include <net/netns/mpls.h>
30#include <linux/ns_common.h>
31#include <linux/idr.h>
32#include <linux/skbuff.h>
33
34struct user_namespace;
35struct proc_dir_entry;
36struct net_device;
37struct sock;
38struct ctl_table_header;
39struct net_generic;
40struct sock;
41struct netns_ipvs;
42
43
44#define NETDEV_HASHBITS 8
45#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
46
47struct net {
48 atomic_t passive; /* To decided when the network
49 * namespace should be freed.
50 */
51 atomic_t count; /* To decided when the network
52 * namespace should be shut down.
53 */
54 spinlock_t rules_mod_lock;
55
56 atomic64_t cookie_gen;
57
58 struct list_head list; /* list of network namespaces */
59 struct list_head cleanup_list; /* namespaces on death row */
60 struct list_head exit_list; /* Use only net_mutex */
61
62 struct user_namespace *user_ns; /* Owning user namespace */
63 struct ucounts *ucounts;
64 spinlock_t nsid_lock;
65 struct idr netns_ids;
66
67 struct ns_common ns;
68
69 struct proc_dir_entry *proc_net;
70 struct proc_dir_entry *proc_net_stat;
71
72#ifdef CONFIG_SYSCTL
73 struct ctl_table_set sysctls;
74#endif
75
76 struct sock *rtnl; /* rtnetlink socket */
77 struct sock *genl_sock;
78
79 struct list_head dev_base_head;
80 struct hlist_head *dev_name_head;
81 struct hlist_head *dev_index_head;
82 unsigned int dev_base_seq; /* protected by rtnl_mutex */
83 int ifindex;
84 unsigned int dev_unreg_count;
85
86 /* core fib_rules */
87 struct list_head rules_ops;
88
89
90 struct net_device *loopback_dev; /* The loopback */
91 struct netns_core core;
92 struct netns_mib mib;
93 struct netns_packet packet;
94 struct netns_unix unx;
95 struct netns_ipv4 ipv4;
96#if IS_ENABLED(CONFIG_IPV6)
97 struct netns_ipv6 ipv6;
98#endif
99#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
100 struct netns_ieee802154_lowpan ieee802154_lowpan;
101#endif
102#if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
103 struct netns_sctp sctp;
104#endif
105#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
106 struct netns_dccp dccp;
107#endif
108#ifdef CONFIG_NETFILTER
109 struct netns_nf nf;
110 struct netns_xt xt;
111#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
112 struct netns_ct ct;
113#endif
114#if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
115 struct netns_nftables nft;
116#endif
117#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
118 struct netns_nf_frag nf_frag;
119#endif
120 struct sock *nfnl;
121 struct sock *nfnl_stash;
122#if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
123 struct list_head nfnl_acct_list;
124#endif
125#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
126 struct list_head nfct_timeout_list;
127#endif
128#endif
129#ifdef CONFIG_WEXT_CORE
130 struct sk_buff_head wext_nlevents;
131#endif
132 struct net_generic __rcu *gen;
133
134 /* Note : following structs are cache line aligned */
135#ifdef CONFIG_XFRM
136 struct netns_xfrm xfrm;
137#endif
138#if IS_ENABLED(CONFIG_IP_VS)
139 struct netns_ipvs *ipvs;
140#endif
141#if IS_ENABLED(CONFIG_MPLS)
142 struct netns_mpls mpls;
143#endif
144 struct sock *diag_nlsk;
145 atomic_t fnhe_genid;
146};
147
148#include <linux/seq_file_net.h>
149
150/* Init's network namespace */
151extern struct net init_net;
152
153#ifdef CONFIG_NET_NS
154struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
155 struct net *old_net);
156
157#else /* CONFIG_NET_NS */
158#include <linux/sched.h>
159#include <linux/nsproxy.h>
160static inline struct net *copy_net_ns(unsigned long flags,
161 struct user_namespace *user_ns, struct net *old_net)
162{
163 if (flags & CLONE_NEWNET)
164 return ERR_PTR(-EINVAL);
165 return old_net;
166}
167#endif /* CONFIG_NET_NS */
168
169
170extern struct list_head net_namespace_list;
171
172struct net *get_net_ns_by_pid(pid_t pid);
173struct net *get_net_ns_by_fd(int fd);
174
175#ifdef CONFIG_SYSCTL
176void ipx_register_sysctl(void);
177void ipx_unregister_sysctl(void);
178#else
179#define ipx_register_sysctl()
180#define ipx_unregister_sysctl()
181#endif
182
183#ifdef CONFIG_NET_NS
184void __put_net(struct net *net);
185
186static inline struct net *get_net(struct net *net)
187{
188 atomic_inc(&net->count);
189 return net;
190}
191
192static inline struct net *maybe_get_net(struct net *net)
193{
194 /* Used when we know struct net exists but we
195 * aren't guaranteed a previous reference count
196 * exists. If the reference count is zero this
197 * function fails and returns NULL.
198 */
199 if (!atomic_inc_not_zero(&net->count))
200 net = NULL;
201 return net;
202}
203
204static inline void put_net(struct net *net)
205{
206 if (atomic_dec_and_test(&net->count))
207 __put_net(net);
208}
209
210static inline
211int net_eq(const struct net *net1, const struct net *net2)
212{
213 return net1 == net2;
214}
215
216void net_drop_ns(void *);
217
218#else
219
220static inline struct net *get_net(struct net *net)
221{
222 return net;
223}
224
225static inline void put_net(struct net *net)
226{
227}
228
229static inline struct net *maybe_get_net(struct net *net)
230{
231 return net;
232}
233
234static inline
235int net_eq(const struct net *net1, const struct net *net2)
236{
237 return 1;
238}
239
240#define net_drop_ns NULL
241#endif
242
243
244typedef struct {
245#ifdef CONFIG_NET_NS
246 struct net *net;
247#endif
248} possible_net_t;
249
250static inline void write_pnet(possible_net_t *pnet, struct net *net)
251{
252#ifdef CONFIG_NET_NS
253 pnet->net = net;
254#endif
255}
256
257static inline struct net *read_pnet(const possible_net_t *pnet)
258{
259#ifdef CONFIG_NET_NS
260 return pnet->net;
261#else
262 return &init_net;
263#endif
264}
265
266#define for_each_net(VAR) \
267 list_for_each_entry(VAR, &net_namespace_list, list)
268
269#define for_each_net_rcu(VAR) \
270 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
271
272#ifdef CONFIG_NET_NS
273#define __net_init
274#define __net_exit
275#define __net_initdata
276#define __net_initconst
277#else
278#define __net_init __init
279#define __net_exit __ref
280#define __net_initdata __initdata
281#define __net_initconst __initconst
282#endif
283
284int peernet2id_alloc(struct net *net, struct net *peer);
285int peernet2id(struct net *net, struct net *peer);
286bool peernet_has_id(struct net *net, struct net *peer);
287struct net *get_net_ns_by_id(struct net *net, int id);
288
289struct pernet_operations {
290 struct list_head list;
291 int (*init)(struct net *net);
292 void (*exit)(struct net *net);
293 void (*exit_batch)(struct list_head *net_exit_list);
294 unsigned int *id;
295 size_t size;
296};
297
298/*
299 * Use these carefully. If you implement a network device and it
300 * needs per network namespace operations use device pernet operations,
301 * otherwise use pernet subsys operations.
302 *
303 * Network interfaces need to be removed from a dying netns _before_
304 * subsys notifiers can be called, as most of the network code cleanup
305 * (which is done from subsys notifiers) runs with the assumption that
306 * dev_remove_pack has been called so no new packets will arrive during
307 * and after the cleanup functions have been called. dev_remove_pack
308 * is not per namespace so instead the guarantee of no more packets
309 * arriving in a network namespace is provided by ensuring that all
310 * network devices and all sockets have left the network namespace
311 * before the cleanup methods are called.
312 *
313 * For the longest time the ipv4 icmp code was registered as a pernet
314 * device which caused kernel oops, and panics during network
315 * namespace cleanup. So please don't get this wrong.
316 */
317int register_pernet_subsys(struct pernet_operations *);
318void unregister_pernet_subsys(struct pernet_operations *);
319int register_pernet_device(struct pernet_operations *);
320void unregister_pernet_device(struct pernet_operations *);
321
322struct ctl_table;
323struct ctl_table_header;
324
325#ifdef CONFIG_SYSCTL
326int net_sysctl_init(void);
327struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
328 struct ctl_table *table);
329void unregister_net_sysctl_table(struct ctl_table_header *header);
330#else
331static inline int net_sysctl_init(void) { return 0; }
332static inline struct ctl_table_header *register_net_sysctl(struct net *net,
333 const char *path, struct ctl_table *table)
334{
335 return NULL;
336}
337static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
338{
339}
340#endif
341
342static inline int rt_genid_ipv4(struct net *net)
343{
344 return atomic_read(&net->ipv4.rt_genid);
345}
346
347static inline void rt_genid_bump_ipv4(struct net *net)
348{
349 atomic_inc(&net->ipv4.rt_genid);
350}
351
352extern void (*__fib6_flush_trees)(struct net *net);
353static inline void rt_genid_bump_ipv6(struct net *net)
354{
355 if (__fib6_flush_trees)
356 __fib6_flush_trees(net);
357}
358
359#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
360static inline struct netns_ieee802154_lowpan *
361net_ieee802154_lowpan(struct net *net)
362{
363 return &net->ieee802154_lowpan;
364}
365#endif
366
367/* For callers who don't really care about whether it's IPv4 or IPv6 */
368static inline void rt_genid_bump_all(struct net *net)
369{
370 rt_genid_bump_ipv4(net);
371 rt_genid_bump_ipv6(net);
372}
373
374static inline int fnhe_genid(struct net *net)
375{
376 return atomic_read(&net->fnhe_genid);
377}
378
379static inline void fnhe_genid_bump(struct net *net)
380{
381 atomic_inc(&net->fnhe_genid);
382}
383
384#endif /* __NET_NET_NAMESPACE_H */