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