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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#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 spinlock_t nsid_lock;
64 struct idr netns_ids;
65
66 struct ns_common ns;
67
68 struct proc_dir_entry *proc_net;
69 struct proc_dir_entry *proc_net_stat;
70
71#ifdef CONFIG_SYSCTL
72 struct ctl_table_set sysctls;
73#endif
74
75 struct sock *rtnl; /* rtnetlink socket */
76 struct sock *genl_sock;
77
78 struct list_head dev_base_head;
79 struct hlist_head *dev_name_head;
80 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 /* core fib_rules */
86 struct list_head rules_ops;
87
88
89 struct net_device *loopback_dev; /* The loopback */
90 struct netns_core core;
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 struct netns_ipv6 ipv6;
97#endif
98#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
99 struct netns_ieee802154_lowpan ieee802154_lowpan;
100#endif
101#if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
102 struct netns_sctp sctp;
103#endif
104#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
105 struct netns_dccp dccp;
106#endif
107#ifdef CONFIG_NETFILTER
108 struct netns_nf nf;
109 struct netns_xt xt;
110#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
111 struct netns_ct ct;
112#endif
113#if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
114 struct netns_nftables nft;
115#endif
116#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
117 struct netns_nf_frag nf_frag;
118#endif
119 struct sock *nfnl;
120 struct sock *nfnl_stash;
121#if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
122 struct list_head nfnl_acct_list;
123#endif
124#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
125 struct list_head nfct_timeout_list;
126#endif
127#endif
128#ifdef CONFIG_WEXT_CORE
129 struct sk_buff_head wext_nlevents;
130#endif
131 struct net_generic __rcu *gen;
132
133 /* Note : following structs are cache line aligned */
134#ifdef CONFIG_XFRM
135 struct netns_xfrm xfrm;
136#endif
137#if IS_ENABLED(CONFIG_IP_VS)
138 struct netns_ipvs *ipvs;
139#endif
140#if IS_ENABLED(CONFIG_MPLS)
141 struct netns_mpls mpls;
142#endif
143 struct sock *diag_nlsk;
144 atomic_t fnhe_genid;
145};
146
147#include <linux/seq_file_net.h>
148
149/* Init's network namespace */
150extern struct net init_net;
151
152#ifdef CONFIG_NET_NS
153struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
154 struct net *old_net);
155
156#else /* CONFIG_NET_NS */
157#include <linux/sched.h>
158#include <linux/nsproxy.h>
159static inline struct net *copy_net_ns(unsigned long flags,
160 struct user_namespace *user_ns, struct net *old_net)
161{
162 if (flags & CLONE_NEWNET)
163 return ERR_PTR(-EINVAL);
164 return old_net;
165}
166#endif /* CONFIG_NET_NS */
167
168
169extern struct list_head net_namespace_list;
170
171struct net *get_net_ns_by_pid(pid_t pid);
172struct net *get_net_ns_by_fd(int pid);
173
174#ifdef CONFIG_SYSCTL
175void ipx_register_sysctl(void);
176void ipx_unregister_sysctl(void);
177#else
178#define ipx_register_sysctl()
179#define ipx_unregister_sysctl()
180#endif
181
182#ifdef CONFIG_NET_NS
183void __put_net(struct net *net);
184
185static inline struct net *get_net(struct net *net)
186{
187 atomic_inc(&net->count);
188 return net;
189}
190
191static inline struct net *maybe_get_net(struct net *net)
192{
193 /* Used when we know struct net exists but we
194 * aren't guaranteed a previous reference count
195 * exists. If the reference count is zero this
196 * function fails and returns NULL.
197 */
198 if (!atomic_inc_not_zero(&net->count))
199 net = NULL;
200 return net;
201}
202
203static inline void put_net(struct net *net)
204{
205 if (atomic_dec_and_test(&net->count))
206 __put_net(net);
207}
208
209static inline
210int net_eq(const struct net *net1, const struct net *net2)
211{
212 return net1 == net2;
213}
214
215void net_drop_ns(void *);
216
217#else
218
219static inline struct net *get_net(struct net *net)
220{
221 return net;
222}
223
224static inline void put_net(struct net *net)
225{
226}
227
228static inline struct net *maybe_get_net(struct net *net)
229{
230 return net;
231}
232
233static inline
234int net_eq(const struct net *net1, const struct net *net2)
235{
236 return 1;
237}
238
239#define net_drop_ns NULL
240#endif
241
242
243typedef struct {
244#ifdef CONFIG_NET_NS
245 struct net *net;
246#endif
247} possible_net_t;
248
249static inline void write_pnet(possible_net_t *pnet, struct net *net)
250{
251#ifdef CONFIG_NET_NS
252 pnet->net = net;
253#endif
254}
255
256static inline struct net *read_pnet(const possible_net_t *pnet)
257{
258#ifdef CONFIG_NET_NS
259 return pnet->net;
260#else
261 return &init_net;
262#endif
263}
264
265#define for_each_net(VAR) \
266 list_for_each_entry(VAR, &net_namespace_list, list)
267
268#define for_each_net_rcu(VAR) \
269 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
270
271#ifdef CONFIG_NET_NS
272#define __net_init
273#define __net_exit
274#define __net_initdata
275#define __net_initconst
276#else
277#define __net_init __init
278#define __net_exit __exit_refok
279#define __net_initdata __initdata
280#define __net_initconst __initconst
281#endif
282
283int peernet2id_alloc(struct net *net, struct net *peer);
284int peernet2id(struct net *net, struct net *peer);
285bool peernet_has_id(struct net *net, struct net *peer);
286struct net *get_net_ns_by_id(struct net *net, int id);
287
288struct pernet_operations {
289 struct list_head list;
290 int (*init)(struct net *net);
291 void (*exit)(struct net *net);
292 void (*exit_batch)(struct list_head *net_exit_list);
293 int *id;
294 size_t size;
295};
296
297/*
298 * Use these carefully. If you implement a network device and it
299 * needs per network namespace operations use device pernet operations,
300 * otherwise use pernet subsys operations.
301 *
302 * Network interfaces need to be removed from a dying netns _before_
303 * subsys notifiers can be called, as most of the network code cleanup
304 * (which is done from subsys notifiers) runs with the assumption that
305 * dev_remove_pack has been called so no new packets will arrive during
306 * and after the cleanup functions have been called. dev_remove_pack
307 * is not per namespace so instead the guarantee of no more packets
308 * arriving in a network namespace is provided by ensuring that all
309 * network devices and all sockets have left the network namespace
310 * before the cleanup methods are called.
311 *
312 * For the longest time the ipv4 icmp code was registered as a pernet
313 * device which caused kernel oops, and panics during network
314 * namespace cleanup. So please don't get this wrong.
315 */
316int register_pernet_subsys(struct pernet_operations *);
317void unregister_pernet_subsys(struct pernet_operations *);
318int register_pernet_device(struct pernet_operations *);
319void unregister_pernet_device(struct pernet_operations *);
320
321struct ctl_table;
322struct ctl_table_header;
323
324#ifdef CONFIG_SYSCTL
325int net_sysctl_init(void);
326struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
327 struct ctl_table *table);
328void unregister_net_sysctl_table(struct ctl_table_header *header);
329#else
330static inline int net_sysctl_init(void) { return 0; }
331static inline struct ctl_table_header *register_net_sysctl(struct net *net,
332 const char *path, struct ctl_table *table)
333{
334 return NULL;
335}
336static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
337{
338}
339#endif
340
341static inline int rt_genid_ipv4(struct net *net)
342{
343 return atomic_read(&net->ipv4.rt_genid);
344}
345
346static inline void rt_genid_bump_ipv4(struct net *net)
347{
348 atomic_inc(&net->ipv4.rt_genid);
349}
350
351extern void (*__fib6_flush_trees)(struct net *net);
352static inline void rt_genid_bump_ipv6(struct net *net)
353{
354 if (__fib6_flush_trees)
355 __fib6_flush_trees(net);
356}
357
358#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
359static inline struct netns_ieee802154_lowpan *
360net_ieee802154_lowpan(struct net *net)
361{
362 return &net->ieee802154_lowpan;
363}
364#endif
365
366/* For callers who don't really care about whether it's IPv4 or IPv6 */
367static inline void rt_genid_bump_all(struct net *net)
368{
369 rt_genid_bump_ipv4(net);
370 rt_genid_bump_ipv6(net);
371}
372
373static inline int fnhe_genid(struct net *net)
374{
375 return atomic_read(&net->fnhe_genid);
376}
377
378static inline void fnhe_genid_bump(struct net *net)
379{
380 atomic_inc(&net->fnhe_genid);
381}
382
383#endif /* __NET_NET_NAMESPACE_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Operations on the network namespace
4 */
5#ifndef __NET_NET_NAMESPACE_H
6#define __NET_NET_NAMESPACE_H
7
8#include <linux/atomic.h>
9#include <linux/refcount.h>
10#include <linux/workqueue.h>
11#include <linux/list.h>
12#include <linux/sysctl.h>
13#include <linux/uidgid.h>
14
15#include <net/flow.h>
16#include <net/netns/core.h>
17#include <net/netns/mib.h>
18#include <net/netns/unix.h>
19#include <net/netns/packet.h>
20#include <net/netns/ipv4.h>
21#include <net/netns/ipv6.h>
22#include <net/netns/nexthop.h>
23#include <net/netns/ieee802154_6lowpan.h>
24#include <net/netns/sctp.h>
25#include <net/netns/dccp.h>
26#include <net/netns/netfilter.h>
27#include <net/netns/x_tables.h>
28#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
29#include <net/netns/conntrack.h>
30#endif
31#include <net/netns/nftables.h>
32#include <net/netns/xfrm.h>
33#include <net/netns/mpls.h>
34#include <net/netns/can.h>
35#include <net/netns/xdp.h>
36#include <net/netns/bpf.h>
37#include <linux/ns_common.h>
38#include <linux/idr.h>
39#include <linux/skbuff.h>
40#include <linux/notifier.h>
41
42struct user_namespace;
43struct proc_dir_entry;
44struct net_device;
45struct sock;
46struct ctl_table_header;
47struct net_generic;
48struct uevent_sock;
49struct netns_ipvs;
50struct bpf_prog;
51
52
53#define NETDEV_HASHBITS 8
54#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
55
56struct net {
57 /* First cache line can be often dirtied.
58 * Do not place here read-mostly fields.
59 */
60 refcount_t passive; /* To decide when the network
61 * namespace should be freed.
62 */
63 refcount_t count; /* To decided when the network
64 * namespace should be shut down.
65 */
66 spinlock_t rules_mod_lock;
67
68 unsigned int dev_unreg_count;
69
70 unsigned int dev_base_seq; /* protected by rtnl_mutex */
71 int ifindex;
72
73 spinlock_t nsid_lock;
74 atomic_t fnhe_genid;
75
76 struct list_head list; /* list of network namespaces */
77 struct list_head exit_list; /* To linked to call pernet exit
78 * methods on dead net (
79 * pernet_ops_rwsem read locked),
80 * or to unregister pernet ops
81 * (pernet_ops_rwsem write locked).
82 */
83 struct llist_node cleanup_list; /* namespaces on death row */
84
85#ifdef CONFIG_KEYS
86 struct key_tag *key_domain; /* Key domain of operation tag */
87#endif
88 struct user_namespace *user_ns; /* Owning user namespace */
89 struct ucounts *ucounts;
90 struct idr netns_ids;
91
92 struct ns_common ns;
93
94 struct list_head dev_base_head;
95 struct proc_dir_entry *proc_net;
96 struct proc_dir_entry *proc_net_stat;
97
98#ifdef CONFIG_SYSCTL
99 struct ctl_table_set sysctls;
100#endif
101
102 struct sock *rtnl; /* rtnetlink socket */
103 struct sock *genl_sock;
104
105 struct uevent_sock *uevent_sock; /* uevent socket */
106
107 struct hlist_head *dev_name_head;
108 struct hlist_head *dev_index_head;
109 struct raw_notifier_head netdev_chain;
110
111 /* Note that @hash_mix can be read millions times per second,
112 * it is critical that it is on a read_mostly cache line.
113 */
114 u32 hash_mix;
115
116 struct net_device *loopback_dev; /* The loopback */
117
118 /* core fib_rules */
119 struct list_head rules_ops;
120
121 struct netns_core core;
122 struct netns_mib mib;
123 struct netns_packet packet;
124 struct netns_unix unx;
125 struct netns_nexthop nexthop;
126 struct netns_ipv4 ipv4;
127#if IS_ENABLED(CONFIG_IPV6)
128 struct netns_ipv6 ipv6;
129#endif
130#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
131 struct netns_ieee802154_lowpan ieee802154_lowpan;
132#endif
133#if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
134 struct netns_sctp sctp;
135#endif
136#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
137 struct netns_dccp dccp;
138#endif
139#ifdef CONFIG_NETFILTER
140 struct netns_nf nf;
141 struct netns_xt xt;
142#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
143 struct netns_ct ct;
144#endif
145#if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
146 struct netns_nftables nft;
147#endif
148#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
149 struct netns_nf_frag nf_frag;
150 struct ctl_table_header *nf_frag_frags_hdr;
151#endif
152 struct sock *nfnl;
153 struct sock *nfnl_stash;
154#if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
155 struct list_head nfnl_acct_list;
156#endif
157#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
158 struct list_head nfct_timeout_list;
159#endif
160#endif
161#ifdef CONFIG_WEXT_CORE
162 struct sk_buff_head wext_nlevents;
163#endif
164 struct net_generic __rcu *gen;
165
166 /* Used to store attached BPF programs */
167 struct netns_bpf bpf;
168
169 /* Note : following structs are cache line aligned */
170#ifdef CONFIG_XFRM
171 struct netns_xfrm xfrm;
172#endif
173
174 atomic64_t net_cookie; /* written once */
175
176#if IS_ENABLED(CONFIG_IP_VS)
177 struct netns_ipvs *ipvs;
178#endif
179#if IS_ENABLED(CONFIG_MPLS)
180 struct netns_mpls mpls;
181#endif
182#if IS_ENABLED(CONFIG_CAN)
183 struct netns_can can;
184#endif
185#ifdef CONFIG_XDP_SOCKETS
186 struct netns_xdp xdp;
187#endif
188#if IS_ENABLED(CONFIG_CRYPTO_USER)
189 struct sock *crypto_nlsk;
190#endif
191 struct sock *diag_nlsk;
192} __randomize_layout;
193
194#include <linux/seq_file_net.h>
195
196/* Init's network namespace */
197extern struct net init_net;
198
199#ifdef CONFIG_NET_NS
200struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
201 struct net *old_net);
202
203void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid);
204
205void net_ns_barrier(void);
206#else /* CONFIG_NET_NS */
207#include <linux/sched.h>
208#include <linux/nsproxy.h>
209static inline struct net *copy_net_ns(unsigned long flags,
210 struct user_namespace *user_ns, struct net *old_net)
211{
212 if (flags & CLONE_NEWNET)
213 return ERR_PTR(-EINVAL);
214 return old_net;
215}
216
217static inline void net_ns_get_ownership(const struct net *net,
218 kuid_t *uid, kgid_t *gid)
219{
220 *uid = GLOBAL_ROOT_UID;
221 *gid = GLOBAL_ROOT_GID;
222}
223
224static inline void net_ns_barrier(void) {}
225#endif /* CONFIG_NET_NS */
226
227
228extern struct list_head net_namespace_list;
229
230struct net *get_net_ns_by_pid(pid_t pid);
231struct net *get_net_ns_by_fd(int fd);
232
233u64 net_gen_cookie(struct net *net);
234
235#ifdef CONFIG_SYSCTL
236void ipx_register_sysctl(void);
237void ipx_unregister_sysctl(void);
238#else
239#define ipx_register_sysctl()
240#define ipx_unregister_sysctl()
241#endif
242
243#ifdef CONFIG_NET_NS
244void __put_net(struct net *net);
245
246static inline struct net *get_net(struct net *net)
247{
248 refcount_inc(&net->count);
249 return net;
250}
251
252static inline struct net *maybe_get_net(struct net *net)
253{
254 /* Used when we know struct net exists but we
255 * aren't guaranteed a previous reference count
256 * exists. If the reference count is zero this
257 * function fails and returns NULL.
258 */
259 if (!refcount_inc_not_zero(&net->count))
260 net = NULL;
261 return net;
262}
263
264static inline void put_net(struct net *net)
265{
266 if (refcount_dec_and_test(&net->count))
267 __put_net(net);
268}
269
270static inline
271int net_eq(const struct net *net1, const struct net *net2)
272{
273 return net1 == net2;
274}
275
276static inline int check_net(const struct net *net)
277{
278 return refcount_read(&net->count) != 0;
279}
280
281void net_drop_ns(void *);
282
283#else
284
285static inline struct net *get_net(struct net *net)
286{
287 return net;
288}
289
290static inline void put_net(struct net *net)
291{
292}
293
294static inline struct net *maybe_get_net(struct net *net)
295{
296 return net;
297}
298
299static inline
300int net_eq(const struct net *net1, const struct net *net2)
301{
302 return 1;
303}
304
305static inline int check_net(const struct net *net)
306{
307 return 1;
308}
309
310#define net_drop_ns NULL
311#endif
312
313
314typedef struct {
315#ifdef CONFIG_NET_NS
316 struct net *net;
317#endif
318} possible_net_t;
319
320static inline void write_pnet(possible_net_t *pnet, struct net *net)
321{
322#ifdef CONFIG_NET_NS
323 pnet->net = net;
324#endif
325}
326
327static inline struct net *read_pnet(const possible_net_t *pnet)
328{
329#ifdef CONFIG_NET_NS
330 return pnet->net;
331#else
332 return &init_net;
333#endif
334}
335
336/* Protected by net_rwsem */
337#define for_each_net(VAR) \
338 list_for_each_entry(VAR, &net_namespace_list, list)
339#define for_each_net_continue_reverse(VAR) \
340 list_for_each_entry_continue_reverse(VAR, &net_namespace_list, list)
341#define for_each_net_rcu(VAR) \
342 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
343
344#ifdef CONFIG_NET_NS
345#define __net_init
346#define __net_exit
347#define __net_initdata
348#define __net_initconst
349#else
350#define __net_init __init
351#define __net_exit __ref
352#define __net_initdata __initdata
353#define __net_initconst __initconst
354#endif
355
356int peernet2id_alloc(struct net *net, struct net *peer, gfp_t gfp);
357int peernet2id(const struct net *net, struct net *peer);
358bool peernet_has_id(const struct net *net, struct net *peer);
359struct net *get_net_ns_by_id(const struct net *net, int id);
360
361struct pernet_operations {
362 struct list_head list;
363 /*
364 * Below methods are called without any exclusive locks.
365 * More than one net may be constructed and destructed
366 * in parallel on several cpus. Every pernet_operations
367 * have to keep in mind all other pernet_operations and
368 * to introduce a locking, if they share common resources.
369 *
370 * The only time they are called with exclusive lock is
371 * from register_pernet_subsys(), unregister_pernet_subsys()
372 * register_pernet_device() and unregister_pernet_device().
373 *
374 * Exit methods using blocking RCU primitives, such as
375 * synchronize_rcu(), should be implemented via exit_batch.
376 * Then, destruction of a group of net requires single
377 * synchronize_rcu() related to these pernet_operations,
378 * instead of separate synchronize_rcu() for every net.
379 * Please, avoid synchronize_rcu() at all, where it's possible.
380 *
381 * Note that a combination of pre_exit() and exit() can
382 * be used, since a synchronize_rcu() is guaranteed between
383 * the calls.
384 */
385 int (*init)(struct net *net);
386 void (*pre_exit)(struct net *net);
387 void (*exit)(struct net *net);
388 void (*exit_batch)(struct list_head *net_exit_list);
389 unsigned int *id;
390 size_t size;
391};
392
393/*
394 * Use these carefully. If you implement a network device and it
395 * needs per network namespace operations use device pernet operations,
396 * otherwise use pernet subsys operations.
397 *
398 * Network interfaces need to be removed from a dying netns _before_
399 * subsys notifiers can be called, as most of the network code cleanup
400 * (which is done from subsys notifiers) runs with the assumption that
401 * dev_remove_pack has been called so no new packets will arrive during
402 * and after the cleanup functions have been called. dev_remove_pack
403 * is not per namespace so instead the guarantee of no more packets
404 * arriving in a network namespace is provided by ensuring that all
405 * network devices and all sockets have left the network namespace
406 * before the cleanup methods are called.
407 *
408 * For the longest time the ipv4 icmp code was registered as a pernet
409 * device which caused kernel oops, and panics during network
410 * namespace cleanup. So please don't get this wrong.
411 */
412int register_pernet_subsys(struct pernet_operations *);
413void unregister_pernet_subsys(struct pernet_operations *);
414int register_pernet_device(struct pernet_operations *);
415void unregister_pernet_device(struct pernet_operations *);
416
417struct ctl_table;
418struct ctl_table_header;
419
420#ifdef CONFIG_SYSCTL
421int net_sysctl_init(void);
422struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
423 struct ctl_table *table);
424void unregister_net_sysctl_table(struct ctl_table_header *header);
425#else
426static inline int net_sysctl_init(void) { return 0; }
427static inline struct ctl_table_header *register_net_sysctl(struct net *net,
428 const char *path, struct ctl_table *table)
429{
430 return NULL;
431}
432static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
433{
434}
435#endif
436
437static inline int rt_genid_ipv4(const struct net *net)
438{
439 return atomic_read(&net->ipv4.rt_genid);
440}
441
442#if IS_ENABLED(CONFIG_IPV6)
443static inline int rt_genid_ipv6(const struct net *net)
444{
445 return atomic_read(&net->ipv6.fib6_sernum);
446}
447#endif
448
449static inline void rt_genid_bump_ipv4(struct net *net)
450{
451 atomic_inc(&net->ipv4.rt_genid);
452}
453
454extern void (*__fib6_flush_trees)(struct net *net);
455static inline void rt_genid_bump_ipv6(struct net *net)
456{
457 if (__fib6_flush_trees)
458 __fib6_flush_trees(net);
459}
460
461#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
462static inline struct netns_ieee802154_lowpan *
463net_ieee802154_lowpan(struct net *net)
464{
465 return &net->ieee802154_lowpan;
466}
467#endif
468
469/* For callers who don't really care about whether it's IPv4 or IPv6 */
470static inline void rt_genid_bump_all(struct net *net)
471{
472 rt_genid_bump_ipv4(net);
473 rt_genid_bump_ipv6(net);
474}
475
476static inline int fnhe_genid(const struct net *net)
477{
478 return atomic_read(&net->fnhe_genid);
479}
480
481static inline void fnhe_genid_bump(struct net *net)
482{
483 atomic_inc(&net->fnhe_genid);
484}
485
486#endif /* __NET_NET_NAMESPACE_H */