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> 13 #include <linux/uidgid.h>
14 14
15 #include <net/flow.h> 15 #include <net/flow.h>
16 #include <net/netns/core.h> 16 #include <net/netns/core.h>
17 #include <net/netns/mib.h> 17 #include <net/netns/mib.h>
18 #include <net/netns/unix.h> 18 #include <net/netns/unix.h>
19 #include <net/netns/packet.h> 19 #include <net/netns/packet.h>
20 #include <net/netns/ipv4.h> 20 #include <net/netns/ipv4.h>
21 #include <net/netns/ipv6.h> 21 #include <net/netns/ipv6.h>
22 #include <net/netns/nexthop.h> 22 #include <net/netns/nexthop.h>
23 #include <net/netns/ieee802154_6lowpan.h> 23 #include <net/netns/ieee802154_6lowpan.h>
24 #include <net/netns/sctp.h> 24 #include <net/netns/sctp.h>
>> 25 #include <net/netns/dccp.h>
25 #include <net/netns/netfilter.h> 26 #include <net/netns/netfilter.h>
>> 27 #include <net/netns/x_tables.h>
26 #if defined(CONFIG_NF_CONNTRACK) || defined(CO 28 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
27 #include <net/netns/conntrack.h> 29 #include <net/netns/conntrack.h>
28 #endif 30 #endif
29 #if IS_ENABLED(CONFIG_NF_FLOW_TABLE) <<
30 #include <net/netns/flow_table.h> <<
31 #endif <<
32 #include <net/netns/nftables.h> 31 #include <net/netns/nftables.h>
33 #include <net/netns/xfrm.h> 32 #include <net/netns/xfrm.h>
34 #include <net/netns/mpls.h> 33 #include <net/netns/mpls.h>
35 #include <net/netns/can.h> 34 #include <net/netns/can.h>
36 #include <net/netns/xdp.h> 35 #include <net/netns/xdp.h>
37 #include <net/netns/smc.h> <<
38 #include <net/netns/bpf.h> 36 #include <net/netns/bpf.h>
39 #include <net/netns/mctp.h> <<
40 #include <net/net_trackers.h> <<
41 #include <linux/ns_common.h> 37 #include <linux/ns_common.h>
42 #include <linux/idr.h> 38 #include <linux/idr.h>
43 #include <linux/skbuff.h> 39 #include <linux/skbuff.h>
44 #include <linux/notifier.h> 40 #include <linux/notifier.h>
45 #include <linux/xarray.h> <<
46 41
47 struct user_namespace; 42 struct user_namespace;
48 struct proc_dir_entry; 43 struct proc_dir_entry;
49 struct net_device; 44 struct net_device;
50 struct sock; 45 struct sock;
51 struct ctl_table_header; 46 struct ctl_table_header;
52 struct net_generic; 47 struct net_generic;
53 struct uevent_sock; 48 struct uevent_sock;
54 struct netns_ipvs; 49 struct netns_ipvs;
55 struct bpf_prog; 50 struct bpf_prog;
56 51
57 52
58 #define NETDEV_HASHBITS 8 53 #define NETDEV_HASHBITS 8
59 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBI 54 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
60 55
61 struct net { 56 struct net {
62 /* First cache line can be often dirti 57 /* First cache line can be often dirtied.
63 * Do not place here read-mostly field 58 * Do not place here read-mostly fields.
64 */ 59 */
65 refcount_t passive; 60 refcount_t passive; /* To decide when the network
66 61 * namespace should be freed.
67 62 */
>> 63 refcount_t count; /* To decided when the network
>> 64 * namespace should be shut down.
>> 65 */
68 spinlock_t rules_mod_lock 66 spinlock_t rules_mod_lock;
69 67
>> 68 unsigned int dev_unreg_count;
>> 69
70 unsigned int dev_base_seq; 70 unsigned int dev_base_seq; /* protected by rtnl_mutex */
71 u32 ifindex; !! 71 int ifindex;
72 72
73 spinlock_t nsid_lock; 73 spinlock_t nsid_lock;
74 atomic_t fnhe_genid; 74 atomic_t fnhe_genid;
75 75
76 struct list_head list; 76 struct list_head list; /* list of network namespaces */
77 struct list_head exit_list; 77 struct list_head exit_list; /* To linked to call pernet exit
78 78 * methods on dead net (
79 79 * pernet_ops_rwsem read locked),
80 80 * or to unregister pernet ops
81 81 * (pernet_ops_rwsem write locked).
82 82 */
83 struct llist_node cleanup_list; 83 struct llist_node cleanup_list; /* namespaces on death row */
84 84
85 #ifdef CONFIG_KEYS 85 #ifdef CONFIG_KEYS
86 struct key_tag *key_domain; 86 struct key_tag *key_domain; /* Key domain of operation tag */
87 #endif 87 #endif
88 struct user_namespace *user_ns; 88 struct user_namespace *user_ns; /* Owning user namespace */
89 struct ucounts *ucounts; 89 struct ucounts *ucounts;
90 struct idr netns_ids; 90 struct idr netns_ids;
91 91
92 struct ns_common ns; 92 struct ns_common ns;
93 struct ref_tracker_dir refcnt_tracker !! 93
94 struct ref_tracker_dir notrefcnt_trac <<
95 <<
96 <<
97 struct list_head dev_base_head; 94 struct list_head dev_base_head;
98 struct proc_dir_entry *proc_net; 95 struct proc_dir_entry *proc_net;
99 struct proc_dir_entry *proc_net_stat 96 struct proc_dir_entry *proc_net_stat;
100 97
101 #ifdef CONFIG_SYSCTL 98 #ifdef CONFIG_SYSCTL
102 struct ctl_table_set sysctls; 99 struct ctl_table_set sysctls;
103 #endif 100 #endif
104 101
105 struct sock *rtnl; 102 struct sock *rtnl; /* rtnetlink socket */
106 struct sock *genl_sock; 103 struct sock *genl_sock;
107 104
108 struct uevent_sock *uevent_sock; 105 struct uevent_sock *uevent_sock; /* uevent socket */
109 106
110 struct hlist_head *dev_name_head 107 struct hlist_head *dev_name_head;
111 struct hlist_head *dev_index_hea 108 struct hlist_head *dev_index_head;
112 struct xarray dev_by_index; <<
113 struct raw_notifier_head netdev 109 struct raw_notifier_head netdev_chain;
114 110
115 /* Note that @hash_mix can be read mil 111 /* Note that @hash_mix can be read millions times per second,
116 * it is critical that it is on a read 112 * it is critical that it is on a read_mostly cache line.
117 */ 113 */
118 u32 hash_mix; 114 u32 hash_mix;
119 115
120 struct net_device *loopback_dev; 116 struct net_device *loopback_dev; /* The loopback */
121 117
122 /* core fib_rules */ 118 /* core fib_rules */
123 struct list_head rules_ops; 119 struct list_head rules_ops;
124 120
125 struct netns_core core; 121 struct netns_core core;
126 struct netns_mib mib; 122 struct netns_mib mib;
127 struct netns_packet packet; 123 struct netns_packet packet;
128 #if IS_ENABLED(CONFIG_UNIX) <<
129 struct netns_unix unx; 124 struct netns_unix unx;
130 #endif <<
131 struct netns_nexthop nexthop; 125 struct netns_nexthop nexthop;
132 struct netns_ipv4 ipv4; 126 struct netns_ipv4 ipv4;
133 #if IS_ENABLED(CONFIG_IPV6) 127 #if IS_ENABLED(CONFIG_IPV6)
134 struct netns_ipv6 ipv6; 128 struct netns_ipv6 ipv6;
135 #endif 129 #endif
136 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 130 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
137 struct netns_ieee802154_lowpan ieee80 131 struct netns_ieee802154_lowpan ieee802154_lowpan;
138 #endif 132 #endif
139 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_ 133 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
140 struct netns_sctp sctp; 134 struct netns_sctp sctp;
141 #endif 135 #endif
>> 136 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
>> 137 struct netns_dccp dccp;
>> 138 #endif
142 #ifdef CONFIG_NETFILTER 139 #ifdef CONFIG_NETFILTER
143 struct netns_nf nf; 140 struct netns_nf nf;
>> 141 struct netns_xt xt;
144 #if defined(CONFIG_NF_CONNTRACK) || defined(CO 142 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
145 struct netns_ct ct; 143 struct netns_ct ct;
146 #endif 144 #endif
147 #if defined(CONFIG_NF_TABLES) || defined(CONFI 145 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
148 struct netns_nftables nft; 146 struct netns_nftables nft;
149 #endif 147 #endif
150 #if IS_ENABLED(CONFIG_NF_FLOW_TABLE) !! 148 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
151 struct netns_ft ft; !! 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;
152 #endif 159 #endif
153 #endif 160 #endif
154 #ifdef CONFIG_WEXT_CORE 161 #ifdef CONFIG_WEXT_CORE
155 struct sk_buff_head wext_nlevents; 162 struct sk_buff_head wext_nlevents;
156 #endif 163 #endif
157 struct net_generic __rcu *gen; 164 struct net_generic __rcu *gen;
158 165
159 /* Used to store attached BPF programs 166 /* Used to store attached BPF programs */
160 struct netns_bpf bpf; 167 struct netns_bpf bpf;
161 168
162 /* Note : following structs are cache 169 /* Note : following structs are cache line aligned */
163 #ifdef CONFIG_XFRM 170 #ifdef CONFIG_XFRM
164 struct netns_xfrm xfrm; 171 struct netns_xfrm xfrm;
165 #endif 172 #endif
166 173
167 u64 net_cookie; /* !! 174 atomic64_t net_cookie; /* written once */
168 175
169 #if IS_ENABLED(CONFIG_IP_VS) 176 #if IS_ENABLED(CONFIG_IP_VS)
170 struct netns_ipvs *ipvs; 177 struct netns_ipvs *ipvs;
171 #endif 178 #endif
172 #if IS_ENABLED(CONFIG_MPLS) 179 #if IS_ENABLED(CONFIG_MPLS)
173 struct netns_mpls mpls; 180 struct netns_mpls mpls;
174 #endif 181 #endif
175 #if IS_ENABLED(CONFIG_CAN) 182 #if IS_ENABLED(CONFIG_CAN)
176 struct netns_can can; 183 struct netns_can can;
177 #endif 184 #endif
178 #ifdef CONFIG_XDP_SOCKETS 185 #ifdef CONFIG_XDP_SOCKETS
179 struct netns_xdp xdp; 186 struct netns_xdp xdp;
180 #endif 187 #endif
181 #if IS_ENABLED(CONFIG_MCTP) <<
182 struct netns_mctp mctp; <<
183 #endif <<
184 #if IS_ENABLED(CONFIG_CRYPTO_USER) 188 #if IS_ENABLED(CONFIG_CRYPTO_USER)
185 struct sock *crypto_nlsk; 189 struct sock *crypto_nlsk;
186 #endif 190 #endif
187 struct sock *diag_nlsk; 191 struct sock *diag_nlsk;
188 #if IS_ENABLED(CONFIG_SMC) <<
189 struct netns_smc smc; <<
190 #endif <<
191 } __randomize_layout; 192 } __randomize_layout;
192 193
193 #include <linux/seq_file_net.h> 194 #include <linux/seq_file_net.h>
194 195
195 /* Init's network namespace */ 196 /* Init's network namespace */
196 extern struct net init_net; 197 extern struct net init_net;
197 198
198 #ifdef CONFIG_NET_NS 199 #ifdef CONFIG_NET_NS
199 struct net *copy_net_ns(unsigned long flags, s 200 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
200 struct net *old_net); 201 struct net *old_net);
201 202
202 void net_ns_get_ownership(const struct net *ne 203 void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid);
203 204
204 void net_ns_barrier(void); 205 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 */ 206 #else /* CONFIG_NET_NS */
209 #include <linux/sched.h> 207 #include <linux/sched.h>
210 #include <linux/nsproxy.h> 208 #include <linux/nsproxy.h>
211 static inline struct net *copy_net_ns(unsigned 209 static inline struct net *copy_net_ns(unsigned long flags,
212 struct user_namespace *user_ns, struct 210 struct user_namespace *user_ns, struct net *old_net)
213 { 211 {
214 if (flags & CLONE_NEWNET) 212 if (flags & CLONE_NEWNET)
215 return ERR_PTR(-EINVAL); 213 return ERR_PTR(-EINVAL);
216 return old_net; 214 return old_net;
217 } 215 }
218 216
219 static inline void net_ns_get_ownership(const 217 static inline void net_ns_get_ownership(const struct net *net,
220 kuid_t 218 kuid_t *uid, kgid_t *gid)
221 { 219 {
222 *uid = GLOBAL_ROOT_UID; 220 *uid = GLOBAL_ROOT_UID;
223 *gid = GLOBAL_ROOT_GID; 221 *gid = GLOBAL_ROOT_GID;
224 } 222 }
225 223
226 static inline void net_ns_barrier(void) {} 224 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 */ 225 #endif /* CONFIG_NET_NS */
238 226
239 227
240 extern struct list_head net_namespace_list; 228 extern struct list_head net_namespace_list;
241 229
242 struct net *get_net_ns_by_pid(pid_t pid); 230 struct net *get_net_ns_by_pid(pid_t pid);
>> 231 struct net *get_net_ns_by_fd(int fd);
>> 232
>> 233 u64 net_gen_cookie(struct net *net);
243 234
244 #ifdef CONFIG_SYSCTL 235 #ifdef CONFIG_SYSCTL
245 void ipx_register_sysctl(void); 236 void ipx_register_sysctl(void);
246 void ipx_unregister_sysctl(void); 237 void ipx_unregister_sysctl(void);
247 #else 238 #else
248 #define ipx_register_sysctl() 239 #define ipx_register_sysctl()
249 #define ipx_unregister_sysctl() 240 #define ipx_unregister_sysctl()
250 #endif 241 #endif
251 242
252 #ifdef CONFIG_NET_NS 243 #ifdef CONFIG_NET_NS
253 void __put_net(struct net *net); 244 void __put_net(struct net *net);
254 245
255 /* Try using get_net_track() instead */ <<
256 static inline struct net *get_net(struct net * 246 static inline struct net *get_net(struct net *net)
257 { 247 {
258 refcount_inc(&net->ns.count); !! 248 refcount_inc(&net->count);
259 return net; 249 return net;
260 } 250 }
261 251
262 static inline struct net *maybe_get_net(struct 252 static inline struct net *maybe_get_net(struct net *net)
263 { 253 {
264 /* Used when we know struct net exists 254 /* Used when we know struct net exists but we
265 * aren't guaranteed a previous refere 255 * aren't guaranteed a previous reference count
266 * exists. If the reference count is 256 * exists. If the reference count is zero this
267 * function fails and returns NULL. 257 * function fails and returns NULL.
268 */ 258 */
269 if (!refcount_inc_not_zero(&net->ns.co !! 259 if (!refcount_inc_not_zero(&net->count))
270 net = NULL; 260 net = NULL;
271 return net; 261 return net;
272 } 262 }
273 263
274 /* Try using put_net_track() instead */ <<
275 static inline void put_net(struct net *net) 264 static inline void put_net(struct net *net)
276 { 265 {
277 if (refcount_dec_and_test(&net->ns.cou !! 266 if (refcount_dec_and_test(&net->count))
278 __put_net(net); 267 __put_net(net);
279 } 268 }
280 269
281 static inline 270 static inline
282 int net_eq(const struct net *net1, const struc 271 int net_eq(const struct net *net1, const struct net *net2)
283 { 272 {
284 return net1 == net2; 273 return net1 == net2;
285 } 274 }
286 275
287 static inline int check_net(const struct net * 276 static inline int check_net(const struct net *net)
288 { 277 {
289 return refcount_read(&net->ns.count) ! !! 278 return refcount_read(&net->count) != 0;
290 } 279 }
291 280
292 void net_drop_ns(void *); 281 void net_drop_ns(void *);
293 282
294 #else 283 #else
295 284
296 static inline struct net *get_net(struct net * 285 static inline struct net *get_net(struct net *net)
297 { 286 {
298 return net; 287 return net;
299 } 288 }
300 289
301 static inline void put_net(struct net *net) 290 static inline void put_net(struct net *net)
302 { 291 {
303 } 292 }
304 293
305 static inline struct net *maybe_get_net(struct 294 static inline struct net *maybe_get_net(struct net *net)
306 { 295 {
307 return net; 296 return net;
308 } 297 }
309 298
310 static inline 299 static inline
311 int net_eq(const struct net *net1, const struc 300 int net_eq(const struct net *net1, const struct net *net2)
312 { 301 {
313 return 1; 302 return 1;
314 } 303 }
315 304
316 static inline int check_net(const struct net * 305 static inline int check_net(const struct net *net)
317 { 306 {
318 return 1; 307 return 1;
319 } 308 }
320 309
321 #define net_drop_ns NULL 310 #define net_drop_ns NULL
322 #endif 311 #endif
323 312
324 313
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 { 314 typedef struct {
368 #ifdef CONFIG_NET_NS 315 #ifdef CONFIG_NET_NS
369 struct net __rcu *net; !! 316 struct net *net;
370 #endif 317 #endif
371 } possible_net_t; 318 } possible_net_t;
372 319
373 static inline void write_pnet(possible_net_t * 320 static inline void write_pnet(possible_net_t *pnet, struct net *net)
374 { 321 {
375 #ifdef CONFIG_NET_NS 322 #ifdef CONFIG_NET_NS
376 rcu_assign_pointer(pnet->net, net); !! 323 pnet->net = net;
377 #endif 324 #endif
378 } 325 }
379 326
380 static inline struct net *read_pnet(const poss 327 static inline struct net *read_pnet(const possible_net_t *pnet)
381 { 328 {
382 #ifdef CONFIG_NET_NS 329 #ifdef CONFIG_NET_NS
383 return rcu_dereference_protected(pnet- !! 330 return pnet->net;
384 #else <<
385 return &init_net; <<
386 #endif <<
387 } <<
388 <<
389 static inline struct net *read_pnet_rcu(possib <<
390 { <<
391 #ifdef CONFIG_NET_NS <<
392 return rcu_dereference(pnet->net); <<
393 #else 331 #else
394 return &init_net; 332 return &init_net;
395 #endif 333 #endif
396 } 334 }
397 335
398 /* Protected by net_rwsem */ 336 /* Protected by net_rwsem */
399 #define for_each_net(VAR) 337 #define for_each_net(VAR) \
400 list_for_each_entry(VAR, &net_namespac 338 list_for_each_entry(VAR, &net_namespace_list, list)
401 #define for_each_net_continue_reverse(VAR) 339 #define for_each_net_continue_reverse(VAR) \
402 list_for_each_entry_continue_reverse(V 340 list_for_each_entry_continue_reverse(VAR, &net_namespace_list, list)
403 #define for_each_net_rcu(VAR) 341 #define for_each_net_rcu(VAR) \
404 list_for_each_entry_rcu(VAR, &net_name 342 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
405 343
406 #ifdef CONFIG_NET_NS 344 #ifdef CONFIG_NET_NS
407 #define __net_init 345 #define __net_init
408 #define __net_exit 346 #define __net_exit
409 #define __net_initdata 347 #define __net_initdata
410 #define __net_initconst 348 #define __net_initconst
411 #else 349 #else
412 #define __net_init __init 350 #define __net_init __init
413 #define __net_exit __ref 351 #define __net_exit __ref
414 #define __net_initdata __initdata 352 #define __net_initdata __initdata
415 #define __net_initconst __initconst 353 #define __net_initconst __initconst
416 #endif 354 #endif
417 355
418 int peernet2id_alloc(struct net *net, struct n 356 int peernet2id_alloc(struct net *net, struct net *peer, gfp_t gfp);
419 int peernet2id(const struct net *net, struct n 357 int peernet2id(const struct net *net, struct net *peer);
420 bool peernet_has_id(const struct net *net, str 358 bool peernet_has_id(const struct net *net, struct net *peer);
421 struct net *get_net_ns_by_id(const struct net 359 struct net *get_net_ns_by_id(const struct net *net, int id);
422 360
423 struct pernet_operations { 361 struct pernet_operations {
424 struct list_head list; 362 struct list_head list;
425 /* 363 /*
426 * Below methods are called without an 364 * Below methods are called without any exclusive locks.
427 * More than one net may be constructe 365 * More than one net may be constructed and destructed
428 * in parallel on several cpus. Every 366 * in parallel on several cpus. Every pernet_operations
429 * have to keep in mind all other pern 367 * have to keep in mind all other pernet_operations and
430 * to introduce a locking, if they sha 368 * to introduce a locking, if they share common resources.
431 * 369 *
432 * The only time they are called with 370 * The only time they are called with exclusive lock is
433 * from register_pernet_subsys(), unre 371 * from register_pernet_subsys(), unregister_pernet_subsys()
434 * register_pernet_device() and unregi 372 * register_pernet_device() and unregister_pernet_device().
435 * 373 *
436 * Exit methods using blocking RCU pri 374 * Exit methods using blocking RCU primitives, such as
437 * synchronize_rcu(), should be implem 375 * synchronize_rcu(), should be implemented via exit_batch.
438 * Then, destruction of a group of net 376 * Then, destruction of a group of net requires single
439 * synchronize_rcu() related to these 377 * synchronize_rcu() related to these pernet_operations,
440 * instead of separate synchronize_rcu 378 * instead of separate synchronize_rcu() for every net.
441 * Please, avoid synchronize_rcu() at 379 * Please, avoid synchronize_rcu() at all, where it's possible.
442 * 380 *
443 * Note that a combination of pre_exit 381 * Note that a combination of pre_exit() and exit() can
444 * be used, since a synchronize_rcu() 382 * be used, since a synchronize_rcu() is guaranteed between
445 * the calls. 383 * the calls.
446 */ 384 */
447 int (*init)(struct net *net); 385 int (*init)(struct net *net);
448 void (*pre_exit)(struct net *net); 386 void (*pre_exit)(struct net *net);
449 void (*exit)(struct net *net); 387 void (*exit)(struct net *net);
450 void (*exit_batch)(struct list_head *n 388 void (*exit_batch)(struct list_head *net_exit_list);
451 /* Following method is called with RTN !! 389 unsigned int *id;
452 void (*exit_batch_rtnl)(struct list_he !! 390 size_t size;
453 struct list_he <<
454 unsigned int * const id; <<
455 const size_t size; <<
456 }; 391 };
457 392
458 /* 393 /*
459 * Use these carefully. If you implement a ne 394 * Use these carefully. If you implement a network device and it
460 * needs per network namespace operations use 395 * needs per network namespace operations use device pernet operations,
461 * otherwise use pernet subsys operations. 396 * otherwise use pernet subsys operations.
462 * 397 *
463 * Network interfaces need to be removed from 398 * Network interfaces need to be removed from a dying netns _before_
464 * subsys notifiers can be called, as most of 399 * subsys notifiers can be called, as most of the network code cleanup
465 * (which is done from subsys notifiers) runs 400 * (which is done from subsys notifiers) runs with the assumption that
466 * dev_remove_pack has been called so no new p 401 * dev_remove_pack has been called so no new packets will arrive during
467 * and after the cleanup functions have been c 402 * and after the cleanup functions have been called. dev_remove_pack
468 * is not per namespace so instead the guarant 403 * is not per namespace so instead the guarantee of no more packets
469 * arriving in a network namespace is provided 404 * arriving in a network namespace is provided by ensuring that all
470 * network devices and all sockets have left t 405 * network devices and all sockets have left the network namespace
471 * before the cleanup methods are called. 406 * before the cleanup methods are called.
472 * 407 *
473 * For the longest time the ipv4 icmp code was 408 * For the longest time the ipv4 icmp code was registered as a pernet
474 * device which caused kernel oops, and panics 409 * device which caused kernel oops, and panics during network
475 * namespace cleanup. So please don't get th 410 * namespace cleanup. So please don't get this wrong.
476 */ 411 */
477 int register_pernet_subsys(struct pernet_opera 412 int register_pernet_subsys(struct pernet_operations *);
478 void unregister_pernet_subsys(struct pernet_op 413 void unregister_pernet_subsys(struct pernet_operations *);
479 int register_pernet_device(struct pernet_opera 414 int register_pernet_device(struct pernet_operations *);
480 void unregister_pernet_device(struct pernet_op 415 void unregister_pernet_device(struct pernet_operations *);
481 416
482 struct ctl_table; 417 struct ctl_table;
>> 418 struct ctl_table_header;
483 419
484 #define register_net_sysctl(net, path, table) <<
485 register_net_sysctl_sz(net, path, tabl <<
486 #ifdef CONFIG_SYSCTL 420 #ifdef CONFIG_SYSCTL
487 int net_sysctl_init(void); 421 int net_sysctl_init(void);
488 struct ctl_table_header *register_net_sysctl_s !! 422 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
489 s !! 423 struct ctl_table *table);
490 void unregister_net_sysctl_table(struct ctl_ta 424 void unregister_net_sysctl_table(struct ctl_table_header *header);
491 #else 425 #else
492 static inline int net_sysctl_init(void) { retu 426 static inline int net_sysctl_init(void) { return 0; }
493 static inline struct ctl_table_header *registe !! 427 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
494 const char *path, struct ctl_table *ta !! 428 const char *path, struct ctl_table *table)
495 { 429 {
496 return NULL; 430 return NULL;
497 } 431 }
498 static inline void unregister_net_sysctl_table 432 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
499 { 433 {
500 } 434 }
501 #endif 435 #endif
502 436
503 static inline int rt_genid_ipv4(const struct n 437 static inline int rt_genid_ipv4(const struct net *net)
504 { 438 {
505 return atomic_read(&net->ipv4.rt_genid 439 return atomic_read(&net->ipv4.rt_genid);
506 } 440 }
507 441
508 #if IS_ENABLED(CONFIG_IPV6) 442 #if IS_ENABLED(CONFIG_IPV6)
509 static inline int rt_genid_ipv6(const struct n 443 static inline int rt_genid_ipv6(const struct net *net)
510 { 444 {
511 return atomic_read(&net->ipv6.fib6_ser 445 return atomic_read(&net->ipv6.fib6_sernum);
512 } 446 }
513 #endif 447 #endif
514 448
515 static inline void rt_genid_bump_ipv4(struct n 449 static inline void rt_genid_bump_ipv4(struct net *net)
516 { 450 {
517 atomic_inc(&net->ipv4.rt_genid); 451 atomic_inc(&net->ipv4.rt_genid);
518 } 452 }
519 453
520 extern void (*__fib6_flush_trees)(struct net * 454 extern void (*__fib6_flush_trees)(struct net *net);
521 static inline void rt_genid_bump_ipv6(struct n 455 static inline void rt_genid_bump_ipv6(struct net *net)
522 { 456 {
523 if (__fib6_flush_trees) 457 if (__fib6_flush_trees)
524 __fib6_flush_trees(net); 458 __fib6_flush_trees(net);
525 } 459 }
526 460
527 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) 461 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
528 static inline struct netns_ieee802154_lowpan * 462 static inline struct netns_ieee802154_lowpan *
529 net_ieee802154_lowpan(struct net *net) 463 net_ieee802154_lowpan(struct net *net)
530 { 464 {
531 return &net->ieee802154_lowpan; 465 return &net->ieee802154_lowpan;
532 } 466 }
533 #endif 467 #endif
534 468
535 /* For callers who don't really care about whe 469 /* For callers who don't really care about whether it's IPv4 or IPv6 */
536 static inline void rt_genid_bump_all(struct ne 470 static inline void rt_genid_bump_all(struct net *net)
537 { 471 {
538 rt_genid_bump_ipv4(net); 472 rt_genid_bump_ipv4(net);
539 rt_genid_bump_ipv6(net); 473 rt_genid_bump_ipv6(net);
540 } 474 }
541 475
542 static inline int fnhe_genid(const struct net 476 static inline int fnhe_genid(const struct net *net)
543 { 477 {
544 return atomic_read(&net->fnhe_genid); 478 return atomic_read(&net->fnhe_genid);
545 } 479 }
546 480
547 static inline void fnhe_genid_bump(struct net 481 static inline void fnhe_genid_bump(struct net *net)
548 { 482 {
549 atomic_inc(&net->fnhe_genid); 483 atomic_inc(&net->fnhe_genid);
550 } 484 }
551 <<
552 #ifdef CONFIG_NET <<
553 void net_ns_init(void); <<
554 #else <<
555 static inline void net_ns_init(void) {} <<
556 #endif <<
557 485
558 #endif /* __NET_NET_NAMESPACE_H */ 486 #endif /* __NET_NET_NAMESPACE_H */
559 487
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