1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * Operations on the network namespace 3 * Operations on the network namespace
4 */ 4 */
5 #ifndef __NET_NET_NAMESPACE_H 5 #ifndef __NET_NET_NAMESPACE_H
6 #define __NET_NET_NAMESPACE_H 6 #define __NET_NET_NAMESPACE_H
7 7
8 #include <linux/atomic.h> 8 #include <linux/atomic.h>
9 #include <linux/refcount.h> 9 #include <linux/refcount.h>
10 #include <linux/workqueue.h> 10 #include <linux/workqueue.h>
11 #include <linux/list.h> 11 #include <linux/list.h>
12 #include <linux/sysctl.h> 12 #include <linux/sysctl.h>
13 #include <linux/uidgid.h> <<
14 13
15 #include <net/flow.h> 14 #include <net/flow.h>
16 #include <net/netns/core.h> 15 #include <net/netns/core.h>
17 #include <net/netns/mib.h> 16 #include <net/netns/mib.h>
18 #include <net/netns/unix.h> 17 #include <net/netns/unix.h>
19 #include <net/netns/packet.h> 18 #include <net/netns/packet.h>
20 #include <net/netns/ipv4.h> 19 #include <net/netns/ipv4.h>
21 #include <net/netns/ipv6.h> 20 #include <net/netns/ipv6.h>
22 #include <net/netns/nexthop.h> <<
23 #include <net/netns/ieee802154_6lowpan.h> 21 #include <net/netns/ieee802154_6lowpan.h>
24 #include <net/netns/sctp.h> 22 #include <net/netns/sctp.h>
>> 23 #include <net/netns/dccp.h>
25 #include <net/netns/netfilter.h> 24 #include <net/netns/netfilter.h>
>> 25 #include <net/netns/x_tables.h>
26 #if defined(CONFIG_NF_CONNTRACK) || defined(CO 26 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
27 #include <net/netns/conntrack.h> 27 #include <net/netns/conntrack.h>
28 #endif 28 #endif
29 #if IS_ENABLED(CONFIG_NF_FLOW_TABLE) <<
30 #include <net/netns/flow_table.h> <<
31 #endif <<
32 #include <net/netns/nftables.h> 29 #include <net/netns/nftables.h>
33 #include <net/netns/xfrm.h> 30 #include <net/netns/xfrm.h>
34 #include <net/netns/mpls.h> 31 #include <net/netns/mpls.h>
35 #include <net/netns/can.h> 32 #include <net/netns/can.h>
36 #include <net/netns/xdp.h> <<
37 #include <net/netns/smc.h> <<
38 #include <net/netns/bpf.h> <<
39 #include <net/netns/mctp.h> <<
40 #include <net/net_trackers.h> <<
41 #include <linux/ns_common.h> 33 #include <linux/ns_common.h>
42 #include <linux/idr.h> 34 #include <linux/idr.h>
43 #include <linux/skbuff.h> 35 #include <linux/skbuff.h>
44 #include <linux/notifier.h> <<
45 #include <linux/xarray.h> <<
46 36
47 struct user_namespace; 37 struct user_namespace;
48 struct proc_dir_entry; 38 struct proc_dir_entry;
49 struct net_device; 39 struct net_device;
50 struct sock; 40 struct sock;
51 struct ctl_table_header; 41 struct ctl_table_header;
52 struct net_generic; 42 struct net_generic;
53 struct uevent_sock; !! 43 struct sock;
54 struct netns_ipvs; 44 struct netns_ipvs;
55 struct bpf_prog; <<
56 45
57 46
58 #define NETDEV_HASHBITS 8 47 #define NETDEV_HASHBITS 8
59 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBI 48 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
60 49
61 struct net { 50 struct net {
62 /* First cache line can be often dirti !! 51 refcount_t passive; /* To decided when the network
63 * Do not place here read-mostly field <<
64 */ <<
65 refcount_t passive; <<
66 52 * namespace should be freed.
67 53 */
>> 54 atomic_t count; /* To decided when the network
>> 55 * namespace should be shut down.
>> 56 */
68 spinlock_t rules_mod_lock 57 spinlock_t rules_mod_lock;
69 58
70 unsigned int dev_base_seq; !! 59 u32 hash_mix;
71 u32 ifindex; !! 60 atomic64_t cookie_gen;
72 <<
73 spinlock_t nsid_lock; <<
74 atomic_t fnhe_genid; <<
75 61
76 struct list_head list; 62 struct list_head list; /* list of network namespaces */
77 struct list_head exit_list; !! 63 struct list_head cleanup_list; /* namespaces on death row */
78 !! 64 struct list_head exit_list; /* Use only net_mutex */
79 <<
80 <<
81 <<
82 <<
83 struct llist_node cleanup_list; <<
84 65
85 #ifdef CONFIG_KEYS <<
86 struct key_tag *key_domain; <<
87 #endif <<
88 struct user_namespace *user_ns; 66 struct user_namespace *user_ns; /* Owning user namespace */
89 struct ucounts *ucounts; 67 struct ucounts *ucounts;
>> 68 spinlock_t nsid_lock;
90 struct idr netns_ids; 69 struct idr netns_ids;
91 70
92 struct ns_common ns; 71 struct ns_common ns;
93 struct ref_tracker_dir refcnt_tracker !! 72
94 struct ref_tracker_dir notrefcnt_trac <<
95 <<
96 <<
97 struct list_head dev_base_head; <<
98 struct proc_dir_entry *proc_net; 73 struct proc_dir_entry *proc_net;
99 struct proc_dir_entry *proc_net_stat 74 struct proc_dir_entry *proc_net_stat;
100 75
101 #ifdef CONFIG_SYSCTL 76 #ifdef CONFIG_SYSCTL
102 struct ctl_table_set sysctls; 77 struct ctl_table_set sysctls;
103 #endif 78 #endif
104 79
105 struct sock *rtnl; 80 struct sock *rtnl; /* rtnetlink socket */
106 struct sock *genl_sock; 81 struct sock *genl_sock;
107 82
108 struct uevent_sock *uevent_sock; !! 83 struct list_head dev_base_head;
109 <<
110 struct hlist_head *dev_name_head 84 struct hlist_head *dev_name_head;
111 struct hlist_head *dev_index_hea 85 struct hlist_head *dev_index_head;
112 struct xarray dev_by_index; !! 86 unsigned int dev_base_seq; /* protected by rtnl_mutex */
113 struct raw_notifier_head netdev !! 87 int ifindex;
114 !! 88 unsigned int dev_unreg_count;
115 /* Note that @hash_mix can be read mil <<
116 * it is critical that it is on a read <<
117 */ <<
118 u32 hash_mix; <<
119 <<
120 struct net_device *loopback_dev; <<
121 89
122 /* core fib_rules */ 90 /* core fib_rules */
123 struct list_head rules_ops; 91 struct list_head rules_ops;
124 92
>> 93 struct list_head fib_notifier_ops; /* protected by net_mutex */
>> 94
>> 95 struct net_device *loopback_dev; /* The loopback */
125 struct netns_core core; 96 struct netns_core core;
126 struct netns_mib mib; 97 struct netns_mib mib;
127 struct netns_packet packet; 98 struct netns_packet packet;
128 #if IS_ENABLED(CONFIG_UNIX) <<
129 struct netns_unix unx; 99 struct netns_unix unx;
130 #endif <<
131 struct netns_nexthop nexthop; <<
132 struct netns_ipv4 ipv4; 100 struct netns_ipv4 ipv4;
133 #if IS_ENABLED(CONFIG_IPV6) 101 #if IS_ENABLED(CONFIG_IPV6)
134 struct netns_ipv6 ipv6; 102 struct netns_ipv6 ipv6;
135 #endif 103 #endif
136 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 104 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
137 struct netns_ieee802154_lowpan ieee80 105 struct netns_ieee802154_lowpan ieee802154_lowpan;
138 #endif 106 #endif
139 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_ 107 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
140 struct netns_sctp sctp; 108 struct netns_sctp sctp;
141 #endif 109 #endif
>> 110 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
>> 111 struct netns_dccp dccp;
>> 112 #endif
142 #ifdef CONFIG_NETFILTER 113 #ifdef CONFIG_NETFILTER
143 struct netns_nf nf; 114 struct netns_nf nf;
>> 115 struct netns_xt xt;
144 #if defined(CONFIG_NF_CONNTRACK) || defined(CO 116 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
145 struct netns_ct ct; 117 struct netns_ct ct;
146 #endif 118 #endif
147 #if defined(CONFIG_NF_TABLES) || defined(CONFI 119 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
148 struct netns_nftables nft; 120 struct netns_nftables nft;
149 #endif 121 #endif
150 #if IS_ENABLED(CONFIG_NF_FLOW_TABLE) !! 122 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
151 struct netns_ft ft; !! 123 struct netns_nf_frag nf_frag;
>> 124 struct ctl_table_header *nf_frag_frags_hdr;
>> 125 #endif
>> 126 struct sock *nfnl;
>> 127 struct sock *nfnl_stash;
>> 128 #if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
>> 129 struct list_head nfnl_acct_list;
>> 130 #endif
>> 131 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
>> 132 struct list_head nfct_timeout_list;
152 #endif 133 #endif
153 #endif 134 #endif
154 #ifdef CONFIG_WEXT_CORE 135 #ifdef CONFIG_WEXT_CORE
155 struct sk_buff_head wext_nlevents; 136 struct sk_buff_head wext_nlevents;
156 #endif 137 #endif
157 struct net_generic __rcu *gen; 138 struct net_generic __rcu *gen;
158 139
159 /* Used to store attached BPF programs <<
160 struct netns_bpf bpf; <<
161 <<
162 /* Note : following structs are cache 140 /* Note : following structs are cache line aligned */
163 #ifdef CONFIG_XFRM 141 #ifdef CONFIG_XFRM
164 struct netns_xfrm xfrm; 142 struct netns_xfrm xfrm;
165 #endif 143 #endif
166 <<
167 u64 net_cookie; /* <<
168 <<
169 #if IS_ENABLED(CONFIG_IP_VS) 144 #if IS_ENABLED(CONFIG_IP_VS)
170 struct netns_ipvs *ipvs; 145 struct netns_ipvs *ipvs;
171 #endif 146 #endif
172 #if IS_ENABLED(CONFIG_MPLS) 147 #if IS_ENABLED(CONFIG_MPLS)
173 struct netns_mpls mpls; 148 struct netns_mpls mpls;
174 #endif 149 #endif
175 #if IS_ENABLED(CONFIG_CAN) 150 #if IS_ENABLED(CONFIG_CAN)
176 struct netns_can can; 151 struct netns_can can;
177 #endif 152 #endif
178 #ifdef CONFIG_XDP_SOCKETS <<
179 struct netns_xdp xdp; <<
180 #endif <<
181 #if IS_ENABLED(CONFIG_MCTP) <<
182 struct netns_mctp mctp; <<
183 #endif <<
184 #if IS_ENABLED(CONFIG_CRYPTO_USER) <<
185 struct sock *crypto_nlsk; <<
186 #endif <<
187 struct sock *diag_nlsk; 153 struct sock *diag_nlsk;
188 #if IS_ENABLED(CONFIG_SMC) !! 154 atomic_t fnhe_genid;
189 struct netns_smc smc; <<
190 #endif <<
191 } __randomize_layout; 155 } __randomize_layout;
192 156
193 #include <linux/seq_file_net.h> 157 #include <linux/seq_file_net.h>
194 158
195 /* Init's network namespace */ 159 /* Init's network namespace */
196 extern struct net init_net; 160 extern struct net init_net;
197 161
198 #ifdef CONFIG_NET_NS 162 #ifdef CONFIG_NET_NS
199 struct net *copy_net_ns(unsigned long flags, s 163 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
200 struct net *old_net); 164 struct net *old_net);
201 165
202 void net_ns_get_ownership(const struct net *ne <<
203 <<
204 void net_ns_barrier(void); 166 void net_ns_barrier(void);
205 <<
206 struct ns_common *get_net_ns(struct ns_common <<
207 struct net *get_net_ns_by_fd(int fd); <<
208 #else /* CONFIG_NET_NS */ 167 #else /* CONFIG_NET_NS */
209 #include <linux/sched.h> 168 #include <linux/sched.h>
210 #include <linux/nsproxy.h> 169 #include <linux/nsproxy.h>
211 static inline struct net *copy_net_ns(unsigned 170 static inline struct net *copy_net_ns(unsigned long flags,
212 struct user_namespace *user_ns, struct 171 struct user_namespace *user_ns, struct net *old_net)
213 { 172 {
214 if (flags & CLONE_NEWNET) 173 if (flags & CLONE_NEWNET)
215 return ERR_PTR(-EINVAL); 174 return ERR_PTR(-EINVAL);
216 return old_net; 175 return old_net;
217 } 176 }
218 177
219 static inline void net_ns_get_ownership(const <<
220 kuid_t <<
221 { <<
222 *uid = GLOBAL_ROOT_UID; <<
223 *gid = GLOBAL_ROOT_GID; <<
224 } <<
225 <<
226 static inline void net_ns_barrier(void) {} 178 static inline void net_ns_barrier(void) {}
227 <<
228 static inline struct ns_common *get_net_ns(str <<
229 { <<
230 return ERR_PTR(-EINVAL); <<
231 } <<
232 <<
233 static inline struct net *get_net_ns_by_fd(int <<
234 { <<
235 return ERR_PTR(-EINVAL); <<
236 } <<
237 #endif /* CONFIG_NET_NS */ 179 #endif /* CONFIG_NET_NS */
238 180
239 181
240 extern struct list_head net_namespace_list; 182 extern struct list_head net_namespace_list;
241 183
242 struct net *get_net_ns_by_pid(pid_t pid); 184 struct net *get_net_ns_by_pid(pid_t pid);
>> 185 struct net *get_net_ns_by_fd(int fd);
243 186
244 #ifdef CONFIG_SYSCTL 187 #ifdef CONFIG_SYSCTL
245 void ipx_register_sysctl(void); 188 void ipx_register_sysctl(void);
246 void ipx_unregister_sysctl(void); 189 void ipx_unregister_sysctl(void);
247 #else 190 #else
248 #define ipx_register_sysctl() 191 #define ipx_register_sysctl()
249 #define ipx_unregister_sysctl() 192 #define ipx_unregister_sysctl()
250 #endif 193 #endif
251 194
252 #ifdef CONFIG_NET_NS 195 #ifdef CONFIG_NET_NS
253 void __put_net(struct net *net); 196 void __put_net(struct net *net);
254 197
255 /* Try using get_net_track() instead */ <<
256 static inline struct net *get_net(struct net * 198 static inline struct net *get_net(struct net *net)
257 { 199 {
258 refcount_inc(&net->ns.count); !! 200 atomic_inc(&net->count);
259 return net; 201 return net;
260 } 202 }
261 203
262 static inline struct net *maybe_get_net(struct 204 static inline struct net *maybe_get_net(struct net *net)
263 { 205 {
264 /* Used when we know struct net exists 206 /* Used when we know struct net exists but we
265 * aren't guaranteed a previous refere 207 * aren't guaranteed a previous reference count
266 * exists. If the reference count is 208 * exists. If the reference count is zero this
267 * function fails and returns NULL. 209 * function fails and returns NULL.
268 */ 210 */
269 if (!refcount_inc_not_zero(&net->ns.co !! 211 if (!atomic_inc_not_zero(&net->count))
270 net = NULL; 212 net = NULL;
271 return net; 213 return net;
272 } 214 }
273 215
274 /* Try using put_net_track() instead */ <<
275 static inline void put_net(struct net *net) 216 static inline void put_net(struct net *net)
276 { 217 {
277 if (refcount_dec_and_test(&net->ns.cou !! 218 if (atomic_dec_and_test(&net->count))
278 __put_net(net); 219 __put_net(net);
279 } 220 }
280 221
281 static inline 222 static inline
282 int net_eq(const struct net *net1, const struc 223 int net_eq(const struct net *net1, const struct net *net2)
283 { 224 {
284 return net1 == net2; 225 return net1 == net2;
285 } 226 }
286 227
287 static inline int check_net(const struct net * 228 static inline int check_net(const struct net *net)
288 { 229 {
289 return refcount_read(&net->ns.count) ! !! 230 return atomic_read(&net->count) != 0;
290 } 231 }
291 232
292 void net_drop_ns(void *); 233 void net_drop_ns(void *);
293 234
294 #else 235 #else
295 236
296 static inline struct net *get_net(struct net * 237 static inline struct net *get_net(struct net *net)
297 { 238 {
298 return net; 239 return net;
299 } 240 }
300 241
301 static inline void put_net(struct net *net) 242 static inline void put_net(struct net *net)
302 { 243 {
303 } 244 }
304 245
305 static inline struct net *maybe_get_net(struct 246 static inline struct net *maybe_get_net(struct net *net)
306 { 247 {
307 return net; 248 return net;
308 } 249 }
309 250
310 static inline 251 static inline
311 int net_eq(const struct net *net1, const struc 252 int net_eq(const struct net *net1, const struct net *net2)
312 { 253 {
313 return 1; 254 return 1;
314 } 255 }
315 256
316 static inline int check_net(const struct net * 257 static inline int check_net(const struct net *net)
317 { 258 {
318 return 1; 259 return 1;
319 } 260 }
320 261
321 #define net_drop_ns NULL 262 #define net_drop_ns NULL
322 #endif 263 #endif
323 264
324 265
325 static inline void __netns_tracker_alloc(struc <<
326 netns <<
327 bool <<
328 gfp_t <<
329 { <<
330 #ifdef CONFIG_NET_NS_REFCNT_TRACKER <<
331 ref_tracker_alloc(refcounted ? &net->r <<
332 &net->n <<
333 tracker, gfp); <<
334 #endif <<
335 } <<
336 <<
337 static inline void netns_tracker_alloc(struct <<
338 gfp_t g <<
339 { <<
340 __netns_tracker_alloc(net, tracker, tr <<
341 } <<
342 <<
343 static inline void __netns_tracker_free(struct <<
344 netns_ <<
345 bool r <<
346 { <<
347 #ifdef CONFIG_NET_NS_REFCNT_TRACKER <<
348 ref_tracker_free(refcounted ? &net->ref <<
349 &net->not <<
350 #endif <<
351 } <<
352 <<
353 static inline struct net *get_net_track(struct <<
354 netns_ <<
355 { <<
356 get_net(net); <<
357 netns_tracker_alloc(net, tracker, gfp) <<
358 return net; <<
359 } <<
360 <<
361 static inline void put_net_track(struct net *n <<
362 { <<
363 __netns_tracker_free(net, tracker, tru <<
364 put_net(net); <<
365 } <<
366 <<
367 typedef struct { 266 typedef struct {
368 #ifdef CONFIG_NET_NS 267 #ifdef CONFIG_NET_NS
369 struct net __rcu *net; !! 268 struct net *net;
370 #endif 269 #endif
371 } possible_net_t; 270 } possible_net_t;
372 271
373 static inline void write_pnet(possible_net_t * 272 static inline void write_pnet(possible_net_t *pnet, struct net *net)
374 { 273 {
375 #ifdef CONFIG_NET_NS 274 #ifdef CONFIG_NET_NS
376 rcu_assign_pointer(pnet->net, net); !! 275 pnet->net = net;
377 #endif 276 #endif
378 } 277 }
379 278
380 static inline struct net *read_pnet(const poss 279 static inline struct net *read_pnet(const possible_net_t *pnet)
381 { 280 {
382 #ifdef CONFIG_NET_NS 281 #ifdef CONFIG_NET_NS
383 return rcu_dereference_protected(pnet- !! 282 return pnet->net;
384 #else 283 #else
385 return &init_net; 284 return &init_net;
386 #endif 285 #endif
387 } 286 }
388 287
389 static inline struct net *read_pnet_rcu(possib <<
390 { <<
391 #ifdef CONFIG_NET_NS <<
392 return rcu_dereference(pnet->net); <<
393 #else <<
394 return &init_net; <<
395 #endif <<
396 } <<
397 <<
398 /* Protected by net_rwsem */ <<
399 #define for_each_net(VAR) 288 #define for_each_net(VAR) \
400 list_for_each_entry(VAR, &net_namespac 289 list_for_each_entry(VAR, &net_namespace_list, list)
401 #define for_each_net_continue_reverse(VAR) !! 290
402 list_for_each_entry_continue_reverse(V <<
403 #define for_each_net_rcu(VAR) 291 #define for_each_net_rcu(VAR) \
404 list_for_each_entry_rcu(VAR, &net_name 292 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
405 293
406 #ifdef CONFIG_NET_NS 294 #ifdef CONFIG_NET_NS
407 #define __net_init 295 #define __net_init
408 #define __net_exit 296 #define __net_exit
409 #define __net_initdata 297 #define __net_initdata
410 #define __net_initconst 298 #define __net_initconst
411 #else 299 #else
412 #define __net_init __init 300 #define __net_init __init
413 #define __net_exit __ref 301 #define __net_exit __ref
414 #define __net_initdata __initdata 302 #define __net_initdata __initdata
415 #define __net_initconst __initconst 303 #define __net_initconst __initconst
416 #endif 304 #endif
417 305
418 int peernet2id_alloc(struct net *net, struct n !! 306 int peernet2id_alloc(struct net *net, struct net *peer);
419 int peernet2id(const struct net *net, struct n !! 307 int peernet2id(struct net *net, struct net *peer);
420 bool peernet_has_id(const struct net *net, str !! 308 bool peernet_has_id(struct net *net, struct net *peer);
421 struct net *get_net_ns_by_id(const struct net !! 309 struct net *get_net_ns_by_id(struct net *net, int id);
422 310
423 struct pernet_operations { 311 struct pernet_operations {
424 struct list_head list; 312 struct list_head list;
425 /* <<
426 * Below methods are called without an <<
427 * More than one net may be constructe <<
428 * in parallel on several cpus. Every <<
429 * have to keep in mind all other pern <<
430 * to introduce a locking, if they sha <<
431 * <<
432 * The only time they are called with <<
433 * from register_pernet_subsys(), unre <<
434 * register_pernet_device() and unregi <<
435 * <<
436 * Exit methods using blocking RCU pri <<
437 * synchronize_rcu(), should be implem <<
438 * Then, destruction of a group of net <<
439 * synchronize_rcu() related to these <<
440 * instead of separate synchronize_rcu <<
441 * Please, avoid synchronize_rcu() at <<
442 * <<
443 * Note that a combination of pre_exit <<
444 * be used, since a synchronize_rcu() <<
445 * the calls. <<
446 */ <<
447 int (*init)(struct net *net); 313 int (*init)(struct net *net);
448 void (*pre_exit)(struct net *net); <<
449 void (*exit)(struct net *net); 314 void (*exit)(struct net *net);
450 void (*exit_batch)(struct list_head *n 315 void (*exit_batch)(struct list_head *net_exit_list);
451 /* Following method is called with RTN !! 316 unsigned int *id;
452 void (*exit_batch_rtnl)(struct list_he !! 317 size_t size;
453 struct list_he <<
454 unsigned int * const id; <<
455 const size_t size; <<
456 }; 318 };
457 319
458 /* 320 /*
459 * Use these carefully. If you implement a ne 321 * Use these carefully. If you implement a network device and it
460 * needs per network namespace operations use 322 * needs per network namespace operations use device pernet operations,
461 * otherwise use pernet subsys operations. 323 * otherwise use pernet subsys operations.
462 * 324 *
463 * Network interfaces need to be removed from 325 * Network interfaces need to be removed from a dying netns _before_
464 * subsys notifiers can be called, as most of 326 * subsys notifiers can be called, as most of the network code cleanup
465 * (which is done from subsys notifiers) runs 327 * (which is done from subsys notifiers) runs with the assumption that
466 * dev_remove_pack has been called so no new p 328 * dev_remove_pack has been called so no new packets will arrive during
467 * and after the cleanup functions have been c 329 * and after the cleanup functions have been called. dev_remove_pack
468 * is not per namespace so instead the guarant 330 * is not per namespace so instead the guarantee of no more packets
469 * arriving in a network namespace is provided 331 * arriving in a network namespace is provided by ensuring that all
470 * network devices and all sockets have left t 332 * network devices and all sockets have left the network namespace
471 * before the cleanup methods are called. 333 * before the cleanup methods are called.
472 * 334 *
473 * For the longest time the ipv4 icmp code was 335 * For the longest time the ipv4 icmp code was registered as a pernet
474 * device which caused kernel oops, and panics 336 * device which caused kernel oops, and panics during network
475 * namespace cleanup. So please don't get th 337 * namespace cleanup. So please don't get this wrong.
476 */ 338 */
477 int register_pernet_subsys(struct pernet_opera 339 int register_pernet_subsys(struct pernet_operations *);
478 void unregister_pernet_subsys(struct pernet_op 340 void unregister_pernet_subsys(struct pernet_operations *);
479 int register_pernet_device(struct pernet_opera 341 int register_pernet_device(struct pernet_operations *);
480 void unregister_pernet_device(struct pernet_op 342 void unregister_pernet_device(struct pernet_operations *);
481 343
482 struct ctl_table; 344 struct ctl_table;
>> 345 struct ctl_table_header;
483 346
484 #define register_net_sysctl(net, path, table) <<
485 register_net_sysctl_sz(net, path, tabl <<
486 #ifdef CONFIG_SYSCTL 347 #ifdef CONFIG_SYSCTL
487 int net_sysctl_init(void); 348 int net_sysctl_init(void);
488 struct ctl_table_header *register_net_sysctl_s !! 349 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
489 s !! 350 struct ctl_table *table);
490 void unregister_net_sysctl_table(struct ctl_ta 351 void unregister_net_sysctl_table(struct ctl_table_header *header);
491 #else 352 #else
492 static inline int net_sysctl_init(void) { retu 353 static inline int net_sysctl_init(void) { return 0; }
493 static inline struct ctl_table_header *registe !! 354 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
494 const char *path, struct ctl_table *ta !! 355 const char *path, struct ctl_table *table)
495 { 356 {
496 return NULL; 357 return NULL;
497 } 358 }
498 static inline void unregister_net_sysctl_table 359 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
499 { 360 {
500 } 361 }
501 #endif 362 #endif
502 363
503 static inline int rt_genid_ipv4(const struct n !! 364 static inline int rt_genid_ipv4(struct net *net)
504 { 365 {
505 return atomic_read(&net->ipv4.rt_genid 366 return atomic_read(&net->ipv4.rt_genid);
506 } 367 }
507 368
508 #if IS_ENABLED(CONFIG_IPV6) <<
509 static inline int rt_genid_ipv6(const struct n <<
510 { <<
511 return atomic_read(&net->ipv6.fib6_ser <<
512 } <<
513 #endif <<
514 <<
515 static inline void rt_genid_bump_ipv4(struct n 369 static inline void rt_genid_bump_ipv4(struct net *net)
516 { 370 {
517 atomic_inc(&net->ipv4.rt_genid); 371 atomic_inc(&net->ipv4.rt_genid);
518 } 372 }
519 373
520 extern void (*__fib6_flush_trees)(struct net * 374 extern void (*__fib6_flush_trees)(struct net *net);
521 static inline void rt_genid_bump_ipv6(struct n 375 static inline void rt_genid_bump_ipv6(struct net *net)
522 { 376 {
523 if (__fib6_flush_trees) 377 if (__fib6_flush_trees)
524 __fib6_flush_trees(net); 378 __fib6_flush_trees(net);
525 } 379 }
526 380
527 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 381 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
528 static inline struct netns_ieee802154_lowpan * 382 static inline struct netns_ieee802154_lowpan *
529 net_ieee802154_lowpan(struct net *net) 383 net_ieee802154_lowpan(struct net *net)
530 { 384 {
531 return &net->ieee802154_lowpan; 385 return &net->ieee802154_lowpan;
532 } 386 }
533 #endif 387 #endif
534 388
535 /* For callers who don't really care about whe 389 /* For callers who don't really care about whether it's IPv4 or IPv6 */
536 static inline void rt_genid_bump_all(struct ne 390 static inline void rt_genid_bump_all(struct net *net)
537 { 391 {
538 rt_genid_bump_ipv4(net); 392 rt_genid_bump_ipv4(net);
539 rt_genid_bump_ipv6(net); 393 rt_genid_bump_ipv6(net);
540 } 394 }
541 395
542 static inline int fnhe_genid(const struct net !! 396 static inline int fnhe_genid(struct net *net)
543 { 397 {
544 return atomic_read(&net->fnhe_genid); 398 return atomic_read(&net->fnhe_genid);
545 } 399 }
546 400
547 static inline void fnhe_genid_bump(struct net 401 static inline void fnhe_genid_bump(struct net *net)
548 { 402 {
549 atomic_inc(&net->fnhe_genid); 403 atomic_inc(&net->fnhe_genid);
550 } 404 }
551 <<
552 #ifdef CONFIG_NET <<
553 void net_ns_init(void); <<
554 #else <<
555 static inline void net_ns_init(void) {} <<
556 #endif <<
557 405
558 #endif /* __NET_NET_NAMESPACE_H */ 406 #endif /* __NET_NET_NAMESPACE_H */
559 407
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