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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/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 */
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 */