Commit | Line | Data |
---|---|---|
482a8524 TG |
1 | /* |
2 | * NETLINK Generic Netlink Family | |
3 | * | |
4 | * Authors: Jamal Hadi Salim | |
5 | * Thomas Graf <tgraf@suug.ch> | |
2dbba6f7 | 6 | * Johannes Berg <johannes@sipsolutions.net> |
482a8524 TG |
7 | */ |
8 | ||
482a8524 TG |
9 | #include <linux/module.h> |
10 | #include <linux/kernel.h> | |
5a0e3ad6 | 11 | #include <linux/slab.h> |
482a8524 TG |
12 | #include <linux/errno.h> |
13 | #include <linux/types.h> | |
14 | #include <linux/socket.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/skbuff.h> | |
14cc3e2b | 17 | #include <linux/mutex.h> |
2dbba6f7 | 18 | #include <linux/bitmap.h> |
def31174 | 19 | #include <linux/rwsem.h> |
482a8524 TG |
20 | #include <net/sock.h> |
21 | #include <net/genetlink.h> | |
22 | ||
14cc3e2b | 23 | static DEFINE_MUTEX(genl_mutex); /* serialization of message processing */ |
def31174 | 24 | static DECLARE_RWSEM(cb_lock); |
482a8524 | 25 | |
f408e0ce | 26 | void genl_lock(void) |
482a8524 | 27 | { |
14cc3e2b | 28 | mutex_lock(&genl_mutex); |
482a8524 | 29 | } |
f408e0ce | 30 | EXPORT_SYMBOL(genl_lock); |
482a8524 | 31 | |
f408e0ce | 32 | void genl_unlock(void) |
482a8524 | 33 | { |
14cc3e2b | 34 | mutex_unlock(&genl_mutex); |
482a8524 | 35 | } |
f408e0ce | 36 | EXPORT_SYMBOL(genl_unlock); |
482a8524 | 37 | |
320f5ea0 | 38 | #ifdef CONFIG_LOCKDEP |
86b1309c PS |
39 | int lockdep_genl_is_held(void) |
40 | { | |
41 | return lockdep_is_held(&genl_mutex); | |
42 | } | |
43 | EXPORT_SYMBOL(lockdep_genl_is_held); | |
44 | #endif | |
45 | ||
def31174 PS |
46 | static void genl_lock_all(void) |
47 | { | |
48 | down_write(&cb_lock); | |
49 | genl_lock(); | |
50 | } | |
51 | ||
52 | static void genl_unlock_all(void) | |
53 | { | |
54 | genl_unlock(); | |
55 | up_write(&cb_lock); | |
56 | } | |
57 | ||
482a8524 TG |
58 | #define GENL_FAM_TAB_SIZE 16 |
59 | #define GENL_FAM_TAB_MASK (GENL_FAM_TAB_SIZE - 1) | |
60 | ||
61 | static struct list_head family_ht[GENL_FAM_TAB_SIZE]; | |
2dbba6f7 JB |
62 | /* |
63 | * Bitmap of multicast groups that are currently in use. | |
64 | * | |
65 | * To avoid an allocation at boot of just one unsigned long, | |
66 | * declare it global instead. | |
67 | * Bit 0 is marked as already used since group 0 is invalid. | |
68 | */ | |
69 | static unsigned long mc_group_start = 0x1; | |
70 | static unsigned long *mc_groups = &mc_group_start; | |
71 | static unsigned long mc_groups_longs = 1; | |
482a8524 TG |
72 | |
73 | static int genl_ctrl_event(int event, void *data); | |
74 | ||
75 | static inline unsigned int genl_family_hash(unsigned int id) | |
76 | { | |
77 | return id & GENL_FAM_TAB_MASK; | |
78 | } | |
79 | ||
80 | static inline struct list_head *genl_family_chain(unsigned int id) | |
81 | { | |
82 | return &family_ht[genl_family_hash(id)]; | |
83 | } | |
84 | ||
85 | static struct genl_family *genl_family_find_byid(unsigned int id) | |
86 | { | |
87 | struct genl_family *f; | |
88 | ||
89 | list_for_each_entry(f, genl_family_chain(id), family_list) | |
90 | if (f->id == id) | |
91 | return f; | |
92 | ||
93 | return NULL; | |
94 | } | |
95 | ||
96 | static struct genl_family *genl_family_find_byname(char *name) | |
97 | { | |
98 | struct genl_family *f; | |
99 | int i; | |
100 | ||
101 | for (i = 0; i < GENL_FAM_TAB_SIZE; i++) | |
102 | list_for_each_entry(f, genl_family_chain(i), family_list) | |
103 | if (strcmp(f->name, name) == 0) | |
104 | return f; | |
105 | ||
106 | return NULL; | |
107 | } | |
108 | ||
109 | static struct genl_ops *genl_get_cmd(u8 cmd, struct genl_family *family) | |
110 | { | |
111 | struct genl_ops *ops; | |
112 | ||
113 | list_for_each_entry(ops, &family->ops_list, ops_list) | |
114 | if (ops->cmd == cmd) | |
115 | return ops; | |
116 | ||
117 | return NULL; | |
118 | } | |
119 | ||
120 | /* Of course we are going to have problems once we hit | |
121 | * 2^16 alive types, but that can only happen by year 2K | |
122 | */ | |
b57ef81f | 123 | static u16 genl_generate_id(void) |
482a8524 | 124 | { |
988ade6b KK |
125 | static u16 id_gen_idx = GENL_MIN_ID; |
126 | int i; | |
482a8524 | 127 | |
988ade6b KK |
128 | for (i = 0; i <= GENL_MAX_ID - GENL_MIN_ID; i++) { |
129 | if (!genl_family_find_byid(id_gen_idx)) | |
130 | return id_gen_idx; | |
131 | if (++id_gen_idx > GENL_MAX_ID) | |
482a8524 | 132 | id_gen_idx = GENL_MIN_ID; |
988ade6b | 133 | } |
482a8524 | 134 | |
988ade6b | 135 | return 0; |
482a8524 TG |
136 | } |
137 | ||
2dbba6f7 JB |
138 | static struct genl_multicast_group notify_grp; |
139 | ||
140 | /** | |
141 | * genl_register_mc_group - register a multicast group | |
142 | * | |
143 | * Registers the specified multicast group and notifies userspace | |
144 | * about the new group. | |
145 | * | |
146 | * Returns 0 on success or a negative error code. | |
147 | * | |
148 | * @family: The generic netlink family the group shall be registered for. | |
149 | * @grp: The group to register, must have a name. | |
150 | */ | |
151 | int genl_register_mc_group(struct genl_family *family, | |
152 | struct genl_multicast_group *grp) | |
153 | { | |
154 | int id; | |
155 | unsigned long *new_groups; | |
b1f57195 | 156 | int err = 0; |
2dbba6f7 JB |
157 | |
158 | BUG_ON(grp->name[0] == '\0'); | |
f1e79e20 | 159 | BUG_ON(memchr(grp->name, '\0', GENL_NAMSIZ) == NULL); |
2dbba6f7 | 160 | |
def31174 | 161 | genl_lock_all(); |
2dbba6f7 JB |
162 | |
163 | /* special-case our own group */ | |
164 | if (grp == ¬ify_grp) | |
165 | id = GENL_ID_CTRL; | |
166 | else | |
167 | id = find_first_zero_bit(mc_groups, | |
168 | mc_groups_longs * BITS_PER_LONG); | |
169 | ||
170 | ||
171 | if (id >= mc_groups_longs * BITS_PER_LONG) { | |
172 | size_t nlen = (mc_groups_longs + 1) * sizeof(unsigned long); | |
173 | ||
174 | if (mc_groups == &mc_group_start) { | |
175 | new_groups = kzalloc(nlen, GFP_KERNEL); | |
176 | if (!new_groups) { | |
177 | err = -ENOMEM; | |
178 | goto out; | |
179 | } | |
180 | mc_groups = new_groups; | |
181 | *mc_groups = mc_group_start; | |
182 | } else { | |
183 | new_groups = krealloc(mc_groups, nlen, GFP_KERNEL); | |
184 | if (!new_groups) { | |
185 | err = -ENOMEM; | |
186 | goto out; | |
187 | } | |
188 | mc_groups = new_groups; | |
189 | mc_groups[mc_groups_longs] = 0; | |
190 | } | |
191 | mc_groups_longs++; | |
192 | } | |
193 | ||
134e6375 JB |
194 | if (family->netnsok) { |
195 | struct net *net; | |
196 | ||
d136f1bd | 197 | netlink_table_grab(); |
134e6375 JB |
198 | rcu_read_lock(); |
199 | for_each_net_rcu(net) { | |
d136f1bd | 200 | err = __netlink_change_ngroups(net->genl_sock, |
134e6375 JB |
201 | mc_groups_longs * BITS_PER_LONG); |
202 | if (err) { | |
203 | /* | |
204 | * No need to roll back, can only fail if | |
205 | * memory allocation fails and then the | |
206 | * number of _possible_ groups has been | |
207 | * increased on some sockets which is ok. | |
208 | */ | |
209 | rcu_read_unlock(); | |
d136f1bd | 210 | netlink_table_ungrab(); |
134e6375 JB |
211 | goto out; |
212 | } | |
213 | } | |
214 | rcu_read_unlock(); | |
d136f1bd | 215 | netlink_table_ungrab(); |
134e6375 JB |
216 | } else { |
217 | err = netlink_change_ngroups(init_net.genl_sock, | |
218 | mc_groups_longs * BITS_PER_LONG); | |
219 | if (err) | |
220 | goto out; | |
221 | } | |
2dbba6f7 JB |
222 | |
223 | grp->id = id; | |
224 | set_bit(id, mc_groups); | |
225 | list_add_tail(&grp->list, &family->mcast_groups); | |
226 | grp->family = family; | |
227 | ||
228 | genl_ctrl_event(CTRL_CMD_NEWMCAST_GRP, grp); | |
229 | out: | |
def31174 | 230 | genl_unlock_all(); |
79d310d0 | 231 | return err; |
2dbba6f7 JB |
232 | } |
233 | EXPORT_SYMBOL(genl_register_mc_group); | |
234 | ||
79dc4386 TG |
235 | static void __genl_unregister_mc_group(struct genl_family *family, |
236 | struct genl_multicast_group *grp) | |
237 | { | |
134e6375 | 238 | struct net *net; |
79dc4386 | 239 | BUG_ON(grp->family != family); |
134e6375 | 240 | |
b8273570 | 241 | netlink_table_grab(); |
134e6375 JB |
242 | rcu_read_lock(); |
243 | for_each_net_rcu(net) | |
b8273570 | 244 | __netlink_clear_multicast_users(net->genl_sock, grp->id); |
134e6375 | 245 | rcu_read_unlock(); |
b8273570 | 246 | netlink_table_ungrab(); |
134e6375 | 247 | |
79dc4386 TG |
248 | clear_bit(grp->id, mc_groups); |
249 | list_del(&grp->list); | |
250 | genl_ctrl_event(CTRL_CMD_DELMCAST_GRP, grp); | |
251 | grp->id = 0; | |
252 | grp->family = NULL; | |
253 | } | |
254 | ||
2dbba6f7 JB |
255 | /** |
256 | * genl_unregister_mc_group - unregister a multicast group | |
257 | * | |
258 | * Unregisters the specified multicast group and notifies userspace | |
259 | * about it. All current listeners on the group are removed. | |
260 | * | |
261 | * Note: It is not necessary to unregister all multicast groups before | |
262 | * unregistering the family, unregistering the family will cause | |
263 | * all assigned multicast groups to be unregistered automatically. | |
264 | * | |
265 | * @family: Generic netlink family the group belongs to. | |
266 | * @grp: The group to unregister, must have been registered successfully | |
267 | * previously. | |
268 | */ | |
269 | void genl_unregister_mc_group(struct genl_family *family, | |
270 | struct genl_multicast_group *grp) | |
271 | { | |
def31174 | 272 | genl_lock_all(); |
79dc4386 | 273 | __genl_unregister_mc_group(family, grp); |
def31174 | 274 | genl_unlock_all(); |
2dbba6f7 | 275 | } |
3efb40c2 | 276 | EXPORT_SYMBOL(genl_unregister_mc_group); |
2dbba6f7 JB |
277 | |
278 | static void genl_unregister_mc_groups(struct genl_family *family) | |
279 | { | |
280 | struct genl_multicast_group *grp, *tmp; | |
281 | ||
282 | list_for_each_entry_safe(grp, tmp, &family->mcast_groups, list) | |
79dc4386 | 283 | __genl_unregister_mc_group(family, grp); |
2dbba6f7 JB |
284 | } |
285 | ||
482a8524 TG |
286 | /** |
287 | * genl_register_ops - register generic netlink operations | |
288 | * @family: generic netlink family | |
289 | * @ops: operations to be registered | |
290 | * | |
291 | * Registers the specified operations and assigns them to the specified | |
292 | * family. Either a doit or dumpit callback must be specified or the | |
293 | * operation will fail. Only one operation structure per command | |
294 | * identifier may be registered. | |
295 | * | |
296 | * See include/net/genetlink.h for more documenation on the operations | |
297 | * structure. | |
298 | * | |
299 | * Returns 0 on success or a negative error code. | |
300 | */ | |
301 | int genl_register_ops(struct genl_family *family, struct genl_ops *ops) | |
302 | { | |
303 | int err = -EINVAL; | |
304 | ||
305 | if (ops->dumpit == NULL && ops->doit == NULL) | |
306 | goto errout; | |
307 | ||
308 | if (genl_get_cmd(ops->cmd, family)) { | |
309 | err = -EEXIST; | |
310 | goto errout; | |
311 | } | |
312 | ||
334c29a6 | 313 | if (ops->dumpit) |
334c29a6 | 314 | ops->flags |= GENL_CMD_CAP_DUMP; |
48d4ed7a JHS |
315 | if (ops->doit) |
316 | ops->flags |= GENL_CMD_CAP_DO; | |
334c29a6 JHS |
317 | if (ops->policy) |
318 | ops->flags |= GENL_CMD_CAP_HASPOL; | |
319 | ||
def31174 | 320 | genl_lock_all(); |
482a8524 | 321 | list_add_tail(&ops->ops_list, &family->ops_list); |
def31174 | 322 | genl_unlock_all(); |
482a8524 TG |
323 | |
324 | genl_ctrl_event(CTRL_CMD_NEWOPS, ops); | |
325 | err = 0; | |
326 | errout: | |
327 | return err; | |
328 | } | |
416c2f9c | 329 | EXPORT_SYMBOL(genl_register_ops); |
482a8524 TG |
330 | |
331 | /** | |
332 | * genl_unregister_ops - unregister generic netlink operations | |
333 | * @family: generic netlink family | |
334 | * @ops: operations to be unregistered | |
335 | * | |
336 | * Unregisters the specified operations and unassigns them from the | |
337 | * specified family. The operation blocks until the current message | |
338 | * processing has finished and doesn't start again until the | |
339 | * unregister process has finished. | |
340 | * | |
341 | * Note: It is not necessary to unregister all operations before | |
342 | * unregistering the family, unregistering the family will cause | |
343 | * all assigned operations to be unregistered automatically. | |
344 | * | |
345 | * Returns 0 on success or a negative error code. | |
346 | */ | |
347 | int genl_unregister_ops(struct genl_family *family, struct genl_ops *ops) | |
348 | { | |
349 | struct genl_ops *rc; | |
350 | ||
def31174 | 351 | genl_lock_all(); |
482a8524 TG |
352 | list_for_each_entry(rc, &family->ops_list, ops_list) { |
353 | if (rc == ops) { | |
354 | list_del(&ops->ops_list); | |
def31174 | 355 | genl_unlock_all(); |
482a8524 TG |
356 | genl_ctrl_event(CTRL_CMD_DELOPS, ops); |
357 | return 0; | |
358 | } | |
359 | } | |
def31174 | 360 | genl_unlock_all(); |
482a8524 TG |
361 | |
362 | return -ENOENT; | |
363 | } | |
416c2f9c | 364 | EXPORT_SYMBOL(genl_unregister_ops); |
482a8524 TG |
365 | |
366 | /** | |
33c6b1f6 | 367 | * __genl_register_family - register a generic netlink family |
482a8524 TG |
368 | * @family: generic netlink family |
369 | * | |
370 | * Registers the specified family after validating it first. Only one | |
371 | * family may be registered with the same family name or identifier. | |
372 | * The family id may equal GENL_ID_GENERATE causing an unique id to | |
373 | * be automatically generated and assigned. | |
374 | * | |
375 | * Return 0 on success or a negative error code. | |
376 | */ | |
33c6b1f6 | 377 | int __genl_register_family(struct genl_family *family) |
482a8524 TG |
378 | { |
379 | int err = -EINVAL; | |
380 | ||
381 | if (family->id && family->id < GENL_MIN_ID) | |
382 | goto errout; | |
383 | ||
384 | if (family->id > GENL_MAX_ID) | |
385 | goto errout; | |
386 | ||
387 | INIT_LIST_HEAD(&family->ops_list); | |
2dbba6f7 | 388 | INIT_LIST_HEAD(&family->mcast_groups); |
482a8524 | 389 | |
def31174 | 390 | genl_lock_all(); |
482a8524 TG |
391 | |
392 | if (genl_family_find_byname(family->name)) { | |
393 | err = -EEXIST; | |
394 | goto errout_locked; | |
395 | } | |
396 | ||
482a8524 TG |
397 | if (family->id == GENL_ID_GENERATE) { |
398 | u16 newid = genl_generate_id(); | |
399 | ||
400 | if (!newid) { | |
401 | err = -ENOMEM; | |
402 | goto errout_locked; | |
403 | } | |
404 | ||
405 | family->id = newid; | |
93860b08 KK |
406 | } else if (genl_family_find_byid(family->id)) { |
407 | err = -EEXIST; | |
408 | goto errout_locked; | |
482a8524 TG |
409 | } |
410 | ||
def31174 | 411 | if (family->maxattr && !family->parallel_ops) { |
482a8524 TG |
412 | family->attrbuf = kmalloc((family->maxattr+1) * |
413 | sizeof(struct nlattr *), GFP_KERNEL); | |
414 | if (family->attrbuf == NULL) { | |
415 | err = -ENOMEM; | |
e200bd80 | 416 | goto errout_locked; |
482a8524 TG |
417 | } |
418 | } else | |
419 | family->attrbuf = NULL; | |
420 | ||
421 | list_add_tail(&family->family_list, genl_family_chain(family->id)); | |
def31174 | 422 | genl_unlock_all(); |
482a8524 TG |
423 | |
424 | genl_ctrl_event(CTRL_CMD_NEWFAMILY, family); | |
425 | ||
426 | return 0; | |
427 | ||
428 | errout_locked: | |
def31174 | 429 | genl_unlock_all(); |
482a8524 TG |
430 | errout: |
431 | return err; | |
432 | } | |
33c6b1f6 | 433 | EXPORT_SYMBOL(__genl_register_family); |
482a8524 | 434 | |
a7b11d73 | 435 | /** |
33c6b1f6 | 436 | * __genl_register_family_with_ops - register a generic netlink family |
a7b11d73 MM |
437 | * @family: generic netlink family |
438 | * @ops: operations to be registered | |
439 | * @n_ops: number of elements to register | |
440 | * | |
441 | * Registers the specified family and operations from the specified table. | |
442 | * Only one family may be registered with the same family name or identifier. | |
443 | * | |
444 | * The family id may equal GENL_ID_GENERATE causing an unique id to | |
445 | * be automatically generated and assigned. | |
446 | * | |
447 | * Either a doit or dumpit callback must be specified for every registered | |
448 | * operation or the function will fail. Only one operation structure per | |
449 | * command identifier may be registered. | |
450 | * | |
451 | * See include/net/genetlink.h for more documenation on the operations | |
452 | * structure. | |
453 | * | |
454 | * This is equivalent to calling genl_register_family() followed by | |
455 | * genl_register_ops() for every operation entry in the table taking | |
456 | * care to unregister the family on error path. | |
457 | * | |
458 | * Return 0 on success or a negative error code. | |
459 | */ | |
33c6b1f6 | 460 | int __genl_register_family_with_ops(struct genl_family *family, |
a7b11d73 MM |
461 | struct genl_ops *ops, size_t n_ops) |
462 | { | |
463 | int err, i; | |
464 | ||
33c6b1f6 | 465 | err = __genl_register_family(family); |
a7b11d73 MM |
466 | if (err) |
467 | return err; | |
468 | ||
469 | for (i = 0; i < n_ops; ++i, ++ops) { | |
470 | err = genl_register_ops(family, ops); | |
471 | if (err) | |
472 | goto err_out; | |
473 | } | |
474 | return 0; | |
475 | err_out: | |
476 | genl_unregister_family(family); | |
477 | return err; | |
478 | } | |
33c6b1f6 | 479 | EXPORT_SYMBOL(__genl_register_family_with_ops); |
a7b11d73 | 480 | |
482a8524 TG |
481 | /** |
482 | * genl_unregister_family - unregister generic netlink family | |
483 | * @family: generic netlink family | |
484 | * | |
485 | * Unregisters the specified family. | |
486 | * | |
487 | * Returns 0 on success or a negative error code. | |
488 | */ | |
489 | int genl_unregister_family(struct genl_family *family) | |
490 | { | |
491 | struct genl_family *rc; | |
492 | ||
def31174 | 493 | genl_lock_all(); |
482a8524 | 494 | |
910d6c32 PE |
495 | genl_unregister_mc_groups(family); |
496 | ||
482a8524 TG |
497 | list_for_each_entry(rc, genl_family_chain(family->id), family_list) { |
498 | if (family->id != rc->id || strcmp(rc->name, family->name)) | |
499 | continue; | |
500 | ||
501 | list_del(&rc->family_list); | |
502 | INIT_LIST_HEAD(&family->ops_list); | |
def31174 | 503 | genl_unlock_all(); |
482a8524 | 504 | |
482a8524 TG |
505 | kfree(family->attrbuf); |
506 | genl_ctrl_event(CTRL_CMD_DELFAMILY, family); | |
507 | return 0; | |
508 | } | |
509 | ||
def31174 | 510 | genl_unlock_all(); |
482a8524 TG |
511 | |
512 | return -ENOENT; | |
513 | } | |
416c2f9c | 514 | EXPORT_SYMBOL(genl_unregister_family); |
482a8524 | 515 | |
a46621a3 DV |
516 | /** |
517 | * genlmsg_put - Add generic netlink header to netlink message | |
518 | * @skb: socket buffer holding the message | |
15e47304 | 519 | * @portid: netlink portid the message is addressed to |
a46621a3 DV |
520 | * @seq: sequence number (usually the one of the sender) |
521 | * @family: generic netlink family | |
2c53040f | 522 | * @flags: netlink message flags |
a46621a3 DV |
523 | * @cmd: generic netlink command |
524 | * | |
525 | * Returns pointer to user specific header | |
526 | */ | |
15e47304 | 527 | void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, |
a46621a3 DV |
528 | struct genl_family *family, int flags, u8 cmd) |
529 | { | |
530 | struct nlmsghdr *nlh; | |
531 | struct genlmsghdr *hdr; | |
532 | ||
15e47304 | 533 | nlh = nlmsg_put(skb, portid, seq, family->id, GENL_HDRLEN + |
a46621a3 DV |
534 | family->hdrsize, flags); |
535 | if (nlh == NULL) | |
536 | return NULL; | |
537 | ||
538 | hdr = nlmsg_data(nlh); | |
539 | hdr->cmd = cmd; | |
540 | hdr->version = family->version; | |
541 | hdr->reserved = 0; | |
542 | ||
543 | return (char *) hdr + GENL_HDRLEN; | |
544 | } | |
545 | EXPORT_SYMBOL(genlmsg_put); | |
546 | ||
9b96309c PS |
547 | static int genl_lock_dumpit(struct sk_buff *skb, struct netlink_callback *cb) |
548 | { | |
549 | struct genl_ops *ops = cb->data; | |
550 | int rc; | |
551 | ||
552 | genl_lock(); | |
553 | rc = ops->dumpit(skb, cb); | |
554 | genl_unlock(); | |
555 | return rc; | |
556 | } | |
557 | ||
558 | static int genl_lock_done(struct netlink_callback *cb) | |
559 | { | |
560 | struct genl_ops *ops = cb->data; | |
561 | int rc = 0; | |
562 | ||
563 | if (ops->done) { | |
564 | genl_lock(); | |
565 | rc = ops->done(cb); | |
566 | genl_unlock(); | |
567 | } | |
568 | return rc; | |
569 | } | |
570 | ||
def31174 PS |
571 | static int genl_family_rcv_msg(struct genl_family *family, |
572 | struct sk_buff *skb, | |
573 | struct nlmsghdr *nlh) | |
482a8524 TG |
574 | { |
575 | struct genl_ops *ops; | |
134e6375 | 576 | struct net *net = sock_net(skb->sk); |
482a8524 TG |
577 | struct genl_info info; |
578 | struct genlmsghdr *hdr = nlmsg_data(nlh); | |
def31174 | 579 | struct nlattr **attrbuf; |
1d00a4eb | 580 | int hdrlen, err; |
482a8524 | 581 | |
134e6375 JB |
582 | /* this family doesn't exist in this netns */ |
583 | if (!family->netnsok && !net_eq(net, &init_net)) | |
584 | return -ENOENT; | |
585 | ||
482a8524 TG |
586 | hdrlen = GENL_HDRLEN + family->hdrsize; |
587 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) | |
1d00a4eb | 588 | return -EINVAL; |
482a8524 TG |
589 | |
590 | ops = genl_get_cmd(hdr->cmd, family); | |
1d00a4eb TG |
591 | if (ops == NULL) |
592 | return -EOPNOTSUPP; | |
482a8524 | 593 | |
1d00a4eb | 594 | if ((ops->flags & GENL_ADMIN_PERM) && |
fd778461 | 595 | !capable(CAP_NET_ADMIN)) |
1d00a4eb | 596 | return -EPERM; |
482a8524 | 597 | |
e1ee3673 | 598 | if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) { |
9b96309c | 599 | int rc; |
def31174 | 600 | |
1d00a4eb TG |
601 | if (ops->dumpit == NULL) |
602 | return -EOPNOTSUPP; | |
482a8524 | 603 | |
9b96309c PS |
604 | if (!family->parallel_ops) { |
605 | struct netlink_dump_control c = { | |
33c6b1f6 | 606 | .module = family->module, |
9b96309c PS |
607 | .data = ops, |
608 | .dump = genl_lock_dumpit, | |
609 | .done = genl_lock_done, | |
610 | }; | |
611 | ||
612 | genl_unlock(); | |
33c6b1f6 | 613 | rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c); |
9b96309c PS |
614 | genl_lock(); |
615 | ||
616 | } else { | |
617 | struct netlink_dump_control c = { | |
33c6b1f6 | 618 | .module = family->module, |
9b96309c PS |
619 | .dump = ops->dumpit, |
620 | .done = ops->done, | |
621 | }; | |
622 | ||
33c6b1f6 | 623 | rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c); |
9b96309c PS |
624 | } |
625 | ||
626 | return rc; | |
482a8524 TG |
627 | } |
628 | ||
1d00a4eb TG |
629 | if (ops->doit == NULL) |
630 | return -EOPNOTSUPP; | |
482a8524 | 631 | |
def31174 PS |
632 | if (family->maxattr && family->parallel_ops) { |
633 | attrbuf = kmalloc((family->maxattr+1) * | |
634 | sizeof(struct nlattr *), GFP_KERNEL); | |
635 | if (attrbuf == NULL) | |
636 | return -ENOMEM; | |
637 | } else | |
638 | attrbuf = family->attrbuf; | |
639 | ||
640 | if (attrbuf) { | |
641 | err = nlmsg_parse(nlh, hdrlen, attrbuf, family->maxattr, | |
482a8524 TG |
642 | ops->policy); |
643 | if (err < 0) | |
50754d21 | 644 | goto out; |
482a8524 TG |
645 | } |
646 | ||
647 | info.snd_seq = nlh->nlmsg_seq; | |
15e47304 | 648 | info.snd_portid = NETLINK_CB(skb).portid; |
482a8524 TG |
649 | info.nlhdr = nlh; |
650 | info.genlhdr = nlmsg_data(nlh); | |
651 | info.userhdr = nlmsg_data(nlh) + GENL_HDRLEN; | |
def31174 | 652 | info.attrs = attrbuf; |
134e6375 | 653 | genl_info_net_set(&info, net); |
ff4c92d8 | 654 | memset(&info.user_ptr, 0, sizeof(info.user_ptr)); |
482a8524 | 655 | |
ff4c92d8 JB |
656 | if (family->pre_doit) { |
657 | err = family->pre_doit(ops, skb, &info); | |
658 | if (err) | |
50754d21 | 659 | goto out; |
ff4c92d8 JB |
660 | } |
661 | ||
662 | err = ops->doit(skb, &info); | |
663 | ||
664 | if (family->post_doit) | |
665 | family->post_doit(ops, skb, &info); | |
666 | ||
50754d21 | 667 | out: |
def31174 PS |
668 | if (family->parallel_ops) |
669 | kfree(attrbuf); | |
670 | ||
671 | return err; | |
672 | } | |
673 | ||
674 | static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
675 | { | |
676 | struct genl_family *family; | |
677 | int err; | |
678 | ||
679 | family = genl_family_find_byid(nlh->nlmsg_type); | |
680 | if (family == NULL) | |
681 | return -ENOENT; | |
682 | ||
683 | if (!family->parallel_ops) | |
684 | genl_lock(); | |
685 | ||
686 | err = genl_family_rcv_msg(family, skb, nlh); | |
687 | ||
688 | if (!family->parallel_ops) | |
689 | genl_unlock(); | |
690 | ||
ff4c92d8 | 691 | return err; |
482a8524 TG |
692 | } |
693 | ||
cd40b7d3 | 694 | static void genl_rcv(struct sk_buff *skb) |
482a8524 | 695 | { |
def31174 | 696 | down_read(&cb_lock); |
cd40b7d3 | 697 | netlink_rcv_skb(skb, &genl_rcv_msg); |
def31174 | 698 | up_read(&cb_lock); |
482a8524 TG |
699 | } |
700 | ||
701 | /************************************************************************** | |
702 | * Controller | |
703 | **************************************************************************/ | |
704 | ||
17c157c8 TG |
705 | static struct genl_family genl_ctrl = { |
706 | .id = GENL_ID_CTRL, | |
707 | .name = "nlctrl", | |
334c29a6 | 708 | .version = 0x2, |
17c157c8 | 709 | .maxattr = CTRL_ATTR_MAX, |
134e6375 | 710 | .netnsok = true, |
17c157c8 TG |
711 | }; |
712 | ||
15e47304 | 713 | static int ctrl_fill_info(struct genl_family *family, u32 portid, u32 seq, |
482a8524 TG |
714 | u32 flags, struct sk_buff *skb, u8 cmd) |
715 | { | |
716 | void *hdr; | |
717 | ||
15e47304 | 718 | hdr = genlmsg_put(skb, portid, seq, &genl_ctrl, flags, cmd); |
482a8524 TG |
719 | if (hdr == NULL) |
720 | return -1; | |
721 | ||
444653f6 DM |
722 | if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) || |
723 | nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id) || | |
724 | nla_put_u32(skb, CTRL_ATTR_VERSION, family->version) || | |
725 | nla_put_u32(skb, CTRL_ATTR_HDRSIZE, family->hdrsize) || | |
726 | nla_put_u32(skb, CTRL_ATTR_MAXATTR, family->maxattr)) | |
727 | goto nla_put_failure; | |
eb328111 | 728 | |
e94ef682 TG |
729 | if (!list_empty(&family->ops_list)) { |
730 | struct nlattr *nla_ops; | |
731 | struct genl_ops *ops; | |
732 | int idx = 1; | |
eb328111 | 733 | |
e94ef682 TG |
734 | nla_ops = nla_nest_start(skb, CTRL_ATTR_OPS); |
735 | if (nla_ops == NULL) | |
eb328111 TG |
736 | goto nla_put_failure; |
737 | ||
e94ef682 TG |
738 | list_for_each_entry(ops, &family->ops_list, ops_list) { |
739 | struct nlattr *nest; | |
eb328111 | 740 | |
e94ef682 TG |
741 | nest = nla_nest_start(skb, idx++); |
742 | if (nest == NULL) | |
743 | goto nla_put_failure; | |
eb328111 | 744 | |
444653f6 DM |
745 | if (nla_put_u32(skb, CTRL_ATTR_OP_ID, ops->cmd) || |
746 | nla_put_u32(skb, CTRL_ATTR_OP_FLAGS, ops->flags)) | |
747 | goto nla_put_failure; | |
eb328111 | 748 | |
e94ef682 TG |
749 | nla_nest_end(skb, nest); |
750 | } | |
751 | ||
752 | nla_nest_end(skb, nla_ops); | |
753 | } | |
482a8524 | 754 | |
2dbba6f7 JB |
755 | if (!list_empty(&family->mcast_groups)) { |
756 | struct genl_multicast_group *grp; | |
757 | struct nlattr *nla_grps; | |
758 | int idx = 1; | |
759 | ||
760 | nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS); | |
761 | if (nla_grps == NULL) | |
762 | goto nla_put_failure; | |
763 | ||
764 | list_for_each_entry(grp, &family->mcast_groups, list) { | |
765 | struct nlattr *nest; | |
766 | ||
767 | nest = nla_nest_start(skb, idx++); | |
768 | if (nest == NULL) | |
769 | goto nla_put_failure; | |
770 | ||
444653f6 DM |
771 | if (nla_put_u32(skb, CTRL_ATTR_MCAST_GRP_ID, grp->id) || |
772 | nla_put_string(skb, CTRL_ATTR_MCAST_GRP_NAME, | |
773 | grp->name)) | |
774 | goto nla_put_failure; | |
2dbba6f7 JB |
775 | |
776 | nla_nest_end(skb, nest); | |
777 | } | |
778 | nla_nest_end(skb, nla_grps); | |
779 | } | |
780 | ||
781 | return genlmsg_end(skb, hdr); | |
782 | ||
783 | nla_put_failure: | |
bc3ed28c TG |
784 | genlmsg_cancel(skb, hdr); |
785 | return -EMSGSIZE; | |
2dbba6f7 JB |
786 | } |
787 | ||
15e47304 | 788 | static int ctrl_fill_mcgrp_info(struct genl_multicast_group *grp, u32 portid, |
2dbba6f7 JB |
789 | u32 seq, u32 flags, struct sk_buff *skb, |
790 | u8 cmd) | |
791 | { | |
792 | void *hdr; | |
793 | struct nlattr *nla_grps; | |
794 | struct nlattr *nest; | |
795 | ||
15e47304 | 796 | hdr = genlmsg_put(skb, portid, seq, &genl_ctrl, flags, cmd); |
2dbba6f7 JB |
797 | if (hdr == NULL) |
798 | return -1; | |
799 | ||
444653f6 DM |
800 | if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, grp->family->name) || |
801 | nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, grp->family->id)) | |
802 | goto nla_put_failure; | |
2dbba6f7 JB |
803 | |
804 | nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS); | |
805 | if (nla_grps == NULL) | |
806 | goto nla_put_failure; | |
807 | ||
808 | nest = nla_nest_start(skb, 1); | |
809 | if (nest == NULL) | |
810 | goto nla_put_failure; | |
811 | ||
444653f6 DM |
812 | if (nla_put_u32(skb, CTRL_ATTR_MCAST_GRP_ID, grp->id) || |
813 | nla_put_string(skb, CTRL_ATTR_MCAST_GRP_NAME, | |
814 | grp->name)) | |
815 | goto nla_put_failure; | |
2dbba6f7 JB |
816 | |
817 | nla_nest_end(skb, nest); | |
818 | nla_nest_end(skb, nla_grps); | |
819 | ||
482a8524 TG |
820 | return genlmsg_end(skb, hdr); |
821 | ||
822 | nla_put_failure: | |
bc3ed28c TG |
823 | genlmsg_cancel(skb, hdr); |
824 | return -EMSGSIZE; | |
482a8524 TG |
825 | } |
826 | ||
827 | static int ctrl_dumpfamily(struct sk_buff *skb, struct netlink_callback *cb) | |
828 | { | |
829 | ||
830 | int i, n = 0; | |
831 | struct genl_family *rt; | |
134e6375 | 832 | struct net *net = sock_net(skb->sk); |
482a8524 TG |
833 | int chains_to_skip = cb->args[0]; |
834 | int fams_to_skip = cb->args[1]; | |
835 | ||
e1d5a010 | 836 | for (i = chains_to_skip; i < GENL_FAM_TAB_SIZE; i++) { |
482a8524 TG |
837 | n = 0; |
838 | list_for_each_entry(rt, genl_family_chain(i), family_list) { | |
134e6375 JB |
839 | if (!rt->netnsok && !net_eq(net, &init_net)) |
840 | continue; | |
482a8524 TG |
841 | if (++n < fams_to_skip) |
842 | continue; | |
15e47304 | 843 | if (ctrl_fill_info(rt, NETLINK_CB(cb->skb).portid, |
482a8524 TG |
844 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
845 | skb, CTRL_CMD_NEWFAMILY) < 0) | |
846 | goto errout; | |
847 | } | |
848 | ||
849 | fams_to_skip = 0; | |
850 | } | |
851 | ||
852 | errout: | |
853 | cb->args[0] = i; | |
854 | cb->args[1] = n; | |
855 | ||
856 | return skb->len; | |
857 | } | |
858 | ||
2dbba6f7 | 859 | static struct sk_buff *ctrl_build_family_msg(struct genl_family *family, |
15e47304 | 860 | u32 portid, int seq, u8 cmd) |
482a8524 TG |
861 | { |
862 | struct sk_buff *skb; | |
863 | int err; | |
864 | ||
339bf98f | 865 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
482a8524 TG |
866 | if (skb == NULL) |
867 | return ERR_PTR(-ENOBUFS); | |
868 | ||
15e47304 | 869 | err = ctrl_fill_info(family, portid, seq, 0, skb, cmd); |
482a8524 TG |
870 | if (err < 0) { |
871 | nlmsg_free(skb); | |
872 | return ERR_PTR(err); | |
873 | } | |
874 | ||
875 | return skb; | |
876 | } | |
877 | ||
2dbba6f7 | 878 | static struct sk_buff *ctrl_build_mcgrp_msg(struct genl_multicast_group *grp, |
15e47304 | 879 | u32 portid, int seq, u8 cmd) |
2dbba6f7 JB |
880 | { |
881 | struct sk_buff *skb; | |
882 | int err; | |
883 | ||
884 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
885 | if (skb == NULL) | |
886 | return ERR_PTR(-ENOBUFS); | |
887 | ||
15e47304 | 888 | err = ctrl_fill_mcgrp_info(grp, portid, seq, 0, skb, cmd); |
2dbba6f7 JB |
889 | if (err < 0) { |
890 | nlmsg_free(skb); | |
891 | return ERR_PTR(err); | |
892 | } | |
893 | ||
894 | return skb; | |
895 | } | |
896 | ||
ef7c79ed | 897 | static const struct nla_policy ctrl_policy[CTRL_ATTR_MAX+1] = { |
482a8524 | 898 | [CTRL_ATTR_FAMILY_ID] = { .type = NLA_U16 }, |
5176f91e TG |
899 | [CTRL_ATTR_FAMILY_NAME] = { .type = NLA_NUL_STRING, |
900 | .len = GENL_NAMSIZ - 1 }, | |
482a8524 TG |
901 | }; |
902 | ||
903 | static int ctrl_getfamily(struct sk_buff *skb, struct genl_info *info) | |
904 | { | |
905 | struct sk_buff *msg; | |
906 | struct genl_family *res = NULL; | |
907 | int err = -EINVAL; | |
908 | ||
909 | if (info->attrs[CTRL_ATTR_FAMILY_ID]) { | |
910 | u16 id = nla_get_u16(info->attrs[CTRL_ATTR_FAMILY_ID]); | |
911 | res = genl_family_find_byid(id); | |
134e6375 | 912 | err = -ENOENT; |
482a8524 TG |
913 | } |
914 | ||
915 | if (info->attrs[CTRL_ATTR_FAMILY_NAME]) { | |
5176f91e | 916 | char *name; |
482a8524 | 917 | |
5176f91e | 918 | name = nla_data(info->attrs[CTRL_ATTR_FAMILY_NAME]); |
482a8524 | 919 | res = genl_family_find_byname(name); |
fa843095 SH |
920 | #ifdef CONFIG_MODULES |
921 | if (res == NULL) { | |
922 | genl_unlock(); | |
c74f2b26 | 923 | up_read(&cb_lock); |
e9412c37 | 924 | request_module("net-pf-%d-proto-%d-family-%s", |
fa843095 | 925 | PF_NETLINK, NETLINK_GENERIC, name); |
c74f2b26 | 926 | down_read(&cb_lock); |
fa843095 SH |
927 | genl_lock(); |
928 | res = genl_family_find_byname(name); | |
929 | } | |
930 | #endif | |
134e6375 | 931 | err = -ENOENT; |
482a8524 TG |
932 | } |
933 | ||
134e6375 JB |
934 | if (res == NULL) |
935 | return err; | |
936 | ||
937 | if (!res->netnsok && !net_eq(genl_info_net(info), &init_net)) { | |
938 | /* family doesn't exist here */ | |
939 | return -ENOENT; | |
482a8524 TG |
940 | } |
941 | ||
15e47304 | 942 | msg = ctrl_build_family_msg(res, info->snd_portid, info->snd_seq, |
2dbba6f7 | 943 | CTRL_CMD_NEWFAMILY); |
134e6375 JB |
944 | if (IS_ERR(msg)) |
945 | return PTR_ERR(msg); | |
482a8524 | 946 | |
134e6375 | 947 | return genlmsg_reply(msg, info); |
482a8524 TG |
948 | } |
949 | ||
950 | static int genl_ctrl_event(int event, void *data) | |
951 | { | |
952 | struct sk_buff *msg; | |
134e6375 JB |
953 | struct genl_family *family; |
954 | struct genl_multicast_group *grp; | |
482a8524 | 955 | |
134e6375 JB |
956 | /* genl is still initialising */ |
957 | if (!init_net.genl_sock) | |
482a8524 TG |
958 | return 0; |
959 | ||
960 | switch (event) { | |
961 | case CTRL_CMD_NEWFAMILY: | |
962 | case CTRL_CMD_DELFAMILY: | |
134e6375 JB |
963 | family = data; |
964 | msg = ctrl_build_family_msg(family, 0, 0, event); | |
2dbba6f7 JB |
965 | break; |
966 | case CTRL_CMD_NEWMCAST_GRP: | |
967 | case CTRL_CMD_DELMCAST_GRP: | |
134e6375 JB |
968 | grp = data; |
969 | family = grp->family; | |
2dbba6f7 | 970 | msg = ctrl_build_mcgrp_msg(data, 0, 0, event); |
482a8524 | 971 | break; |
134e6375 JB |
972 | default: |
973 | return -EINVAL; | |
974 | } | |
975 | ||
976 | if (IS_ERR(msg)) | |
977 | return PTR_ERR(msg); | |
978 | ||
979 | if (!family->netnsok) { | |
980 | genlmsg_multicast_netns(&init_net, msg, 0, | |
981 | GENL_ID_CTRL, GFP_KERNEL); | |
982 | } else { | |
983 | rcu_read_lock(); | |
984 | genlmsg_multicast_allns(msg, 0, GENL_ID_CTRL, GFP_ATOMIC); | |
985 | rcu_read_unlock(); | |
482a8524 TG |
986 | } |
987 | ||
988 | return 0; | |
989 | } | |
990 | ||
991 | static struct genl_ops genl_ctrl_ops = { | |
992 | .cmd = CTRL_CMD_GETFAMILY, | |
993 | .doit = ctrl_getfamily, | |
994 | .dumpit = ctrl_dumpfamily, | |
995 | .policy = ctrl_policy, | |
996 | }; | |
997 | ||
2dbba6f7 JB |
998 | static struct genl_multicast_group notify_grp = { |
999 | .name = "notify", | |
1000 | }; | |
1001 | ||
134e6375 JB |
1002 | static int __net_init genl_pernet_init(struct net *net) |
1003 | { | |
a31f2d17 PNA |
1004 | struct netlink_kernel_cfg cfg = { |
1005 | .input = genl_rcv, | |
9785e10a | 1006 | .flags = NL_CFG_F_NONROOT_RECV, |
a31f2d17 PNA |
1007 | }; |
1008 | ||
134e6375 | 1009 | /* we'll bump the group number right afterwards */ |
9f00d977 | 1010 | net->genl_sock = netlink_kernel_create(net, NETLINK_GENERIC, &cfg); |
134e6375 JB |
1011 | |
1012 | if (!net->genl_sock && net_eq(net, &init_net)) | |
1013 | panic("GENL: Cannot initialize generic netlink\n"); | |
1014 | ||
1015 | if (!net->genl_sock) | |
1016 | return -ENOMEM; | |
1017 | ||
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | static void __net_exit genl_pernet_exit(struct net *net) | |
1022 | { | |
1023 | netlink_kernel_release(net->genl_sock); | |
1024 | net->genl_sock = NULL; | |
1025 | } | |
1026 | ||
1027 | static struct pernet_operations genl_pernet_ops = { | |
1028 | .init = genl_pernet_init, | |
1029 | .exit = genl_pernet_exit, | |
1030 | }; | |
1031 | ||
482a8524 TG |
1032 | static int __init genl_init(void) |
1033 | { | |
1034 | int i, err; | |
1035 | ||
1036 | for (i = 0; i < GENL_FAM_TAB_SIZE; i++) | |
1037 | INIT_LIST_HEAD(&family_ht[i]); | |
1038 | ||
652c6717 | 1039 | err = genl_register_family_with_ops(&genl_ctrl, &genl_ctrl_ops, 1); |
482a8524 | 1040 | if (err < 0) |
134e6375 | 1041 | goto problem; |
482a8524 | 1042 | |
134e6375 JB |
1043 | err = register_pernet_subsys(&genl_pernet_ops); |
1044 | if (err) | |
1045 | goto problem; | |
482a8524 | 1046 | |
2dbba6f7 JB |
1047 | err = genl_register_mc_group(&genl_ctrl, ¬ify_grp); |
1048 | if (err < 0) | |
134e6375 | 1049 | goto problem; |
2dbba6f7 | 1050 | |
482a8524 TG |
1051 | return 0; |
1052 | ||
134e6375 | 1053 | problem: |
482a8524 | 1054 | panic("GENL: Cannot register controller: %d\n", err); |
482a8524 TG |
1055 | } |
1056 | ||
1057 | subsys_initcall(genl_init); | |
1058 | ||
15e47304 | 1059 | static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group, |
134e6375 JB |
1060 | gfp_t flags) |
1061 | { | |
1062 | struct sk_buff *tmp; | |
1063 | struct net *net, *prev = NULL; | |
1064 | int err; | |
1065 | ||
1066 | for_each_net_rcu(net) { | |
1067 | if (prev) { | |
1068 | tmp = skb_clone(skb, flags); | |
1069 | if (!tmp) { | |
1070 | err = -ENOMEM; | |
1071 | goto error; | |
1072 | } | |
1073 | err = nlmsg_multicast(prev->genl_sock, tmp, | |
15e47304 | 1074 | portid, group, flags); |
134e6375 JB |
1075 | if (err) |
1076 | goto error; | |
1077 | } | |
1078 | ||
1079 | prev = net; | |
1080 | } | |
1081 | ||
15e47304 | 1082 | return nlmsg_multicast(prev->genl_sock, skb, portid, group, flags); |
134e6375 JB |
1083 | error: |
1084 | kfree_skb(skb); | |
1085 | return err; | |
1086 | } | |
1087 | ||
15e47304 | 1088 | int genlmsg_multicast_allns(struct sk_buff *skb, u32 portid, unsigned int group, |
134e6375 JB |
1089 | gfp_t flags) |
1090 | { | |
15e47304 | 1091 | return genlmsg_mcast(skb, portid, group, flags); |
134e6375 JB |
1092 | } |
1093 | EXPORT_SYMBOL(genlmsg_multicast_allns); | |
263ba61d | 1094 | |
15e47304 | 1095 | void genl_notify(struct sk_buff *skb, struct net *net, u32 portid, u32 group, |
263ba61d PS |
1096 | struct nlmsghdr *nlh, gfp_t flags) |
1097 | { | |
1098 | struct sock *sk = net->genl_sock; | |
1099 | int report = 0; | |
1100 | ||
1101 | if (nlh) | |
1102 | report = nlmsg_report(nlh); | |
1103 | ||
15e47304 | 1104 | nlmsg_notify(sk, skb, portid, group, report, flags); |
263ba61d PS |
1105 | } |
1106 | EXPORT_SYMBOL(genl_notify); |