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. | |
e5dcecba JB |
68 | * Bit 1 is marked as already used since the drop-monitor code |
69 | * abuses the API and thinks it can statically use group 1. | |
70 | * That group will typically conflict with other groups that | |
71 | * any proper users use. | |
2a94fe48 JB |
72 | * Bit 16 is marked as used since it's used for generic netlink |
73 | * and the code no longer marks pre-reserved IDs as used. | |
2ecf7536 JB |
74 | * Bit 17 is marked as already used since the VFS quota code |
75 | * also abused this API and relied on family == group ID, we | |
76 | * cater to that by giving it a static family and group ID. | |
2dbba6f7 | 77 | */ |
2a94fe48 JB |
78 | static unsigned long mc_group_start = 0x3 | BIT(GENL_ID_CTRL) | |
79 | BIT(GENL_ID_VFS_DQUOT); | |
2dbba6f7 JB |
80 | static unsigned long *mc_groups = &mc_group_start; |
81 | static unsigned long mc_groups_longs = 1; | |
482a8524 | 82 | |
c2ebb908 | 83 | static int genl_ctrl_event(int event, struct genl_family *family, |
2a94fe48 JB |
84 | const struct genl_multicast_group *grp, |
85 | int grp_id); | |
482a8524 TG |
86 | |
87 | static inline unsigned int genl_family_hash(unsigned int id) | |
88 | { | |
89 | return id & GENL_FAM_TAB_MASK; | |
90 | } | |
91 | ||
92 | static inline struct list_head *genl_family_chain(unsigned int id) | |
93 | { | |
94 | return &family_ht[genl_family_hash(id)]; | |
95 | } | |
96 | ||
97 | static struct genl_family *genl_family_find_byid(unsigned int id) | |
98 | { | |
99 | struct genl_family *f; | |
100 | ||
101 | list_for_each_entry(f, genl_family_chain(id), family_list) | |
102 | if (f->id == id) | |
103 | return f; | |
104 | ||
105 | return NULL; | |
106 | } | |
107 | ||
108 | static struct genl_family *genl_family_find_byname(char *name) | |
109 | { | |
110 | struct genl_family *f; | |
111 | int i; | |
112 | ||
113 | for (i = 0; i < GENL_FAM_TAB_SIZE; i++) | |
114 | list_for_each_entry(f, genl_family_chain(i), family_list) | |
115 | if (strcmp(f->name, name) == 0) | |
116 | return f; | |
117 | ||
118 | return NULL; | |
119 | } | |
120 | ||
f84f771d | 121 | static const struct genl_ops *genl_get_cmd(u8 cmd, struct genl_family *family) |
482a8524 | 122 | { |
d91824c0 | 123 | int i; |
482a8524 | 124 | |
d91824c0 JB |
125 | for (i = 0; i < family->n_ops; i++) |
126 | if (family->ops[i].cmd == cmd) | |
127 | return &family->ops[i]; | |
482a8524 TG |
128 | |
129 | return NULL; | |
130 | } | |
131 | ||
132 | /* Of course we are going to have problems once we hit | |
133 | * 2^16 alive types, but that can only happen by year 2K | |
134 | */ | |
b57ef81f | 135 | static u16 genl_generate_id(void) |
482a8524 | 136 | { |
988ade6b KK |
137 | static u16 id_gen_idx = GENL_MIN_ID; |
138 | int i; | |
482a8524 | 139 | |
988ade6b | 140 | for (i = 0; i <= GENL_MAX_ID - GENL_MIN_ID; i++) { |
2ecf7536 JB |
141 | if (id_gen_idx != GENL_ID_VFS_DQUOT && |
142 | !genl_family_find_byid(id_gen_idx)) | |
988ade6b KK |
143 | return id_gen_idx; |
144 | if (++id_gen_idx > GENL_MAX_ID) | |
482a8524 | 145 | id_gen_idx = GENL_MIN_ID; |
988ade6b | 146 | } |
482a8524 | 147 | |
988ade6b | 148 | return 0; |
482a8524 TG |
149 | } |
150 | ||
2a94fe48 | 151 | static int genl_allocate_reserve_groups(int n_groups, int *first_id) |
2dbba6f7 | 152 | { |
2dbba6f7 | 153 | unsigned long *new_groups; |
2a94fe48 JB |
154 | int start = 0; |
155 | int i; | |
156 | int id; | |
157 | bool fits; | |
158 | ||
159 | do { | |
160 | if (start == 0) | |
161 | id = find_first_zero_bit(mc_groups, | |
162 | mc_groups_longs * | |
163 | BITS_PER_LONG); | |
164 | else | |
165 | id = find_next_zero_bit(mc_groups, | |
166 | mc_groups_longs * BITS_PER_LONG, | |
167 | start); | |
168 | ||
169 | fits = true; | |
170 | for (i = id; | |
171 | i < min_t(int, id + n_groups, | |
172 | mc_groups_longs * BITS_PER_LONG); | |
173 | i++) { | |
174 | if (test_bit(i, mc_groups)) { | |
175 | start = i; | |
176 | fits = false; | |
177 | break; | |
178 | } | |
179 | } | |
2dbba6f7 | 180 | |
2a94fe48 JB |
181 | if (id >= mc_groups_longs * BITS_PER_LONG) { |
182 | unsigned long new_longs = mc_groups_longs + | |
183 | BITS_TO_LONGS(n_groups); | |
184 | size_t nlen = new_longs * sizeof(unsigned long); | |
185 | ||
186 | if (mc_groups == &mc_group_start) { | |
187 | new_groups = kzalloc(nlen, GFP_KERNEL); | |
188 | if (!new_groups) | |
189 | return -ENOMEM; | |
190 | mc_groups = new_groups; | |
191 | *mc_groups = mc_group_start; | |
192 | } else { | |
193 | new_groups = krealloc(mc_groups, nlen, | |
194 | GFP_KERNEL); | |
195 | if (!new_groups) | |
196 | return -ENOMEM; | |
197 | mc_groups = new_groups; | |
198 | for (i = 0; i < BITS_TO_LONGS(n_groups); i++) | |
199 | mc_groups[mc_groups_longs + i] = 0; | |
200 | } | |
201 | mc_groups_longs = new_longs; | |
202 | } | |
203 | } while (!fits); | |
2dbba6f7 | 204 | |
2a94fe48 JB |
205 | for (i = id; i < id + n_groups; i++) |
206 | set_bit(i, mc_groups); | |
207 | *first_id = id; | |
208 | return 0; | |
209 | } | |
210 | ||
211 | static struct genl_family genl_ctrl; | |
212 | ||
213 | static int genl_validate_assign_mc_groups(struct genl_family *family) | |
214 | { | |
215 | int first_id; | |
216 | int n_groups = family->n_mcgrps; | |
217 | int err, i; | |
218 | bool groups_allocated = false; | |
219 | ||
220 | if (!n_groups) | |
221 | return 0; | |
222 | ||
223 | for (i = 0; i < n_groups; i++) { | |
224 | const struct genl_multicast_group *grp = &family->mcgrps[i]; | |
225 | ||
226 | if (WARN_ON(grp->name[0] == '\0')) | |
227 | return -EINVAL; | |
228 | if (WARN_ON(memchr(grp->name, '\0', GENL_NAMSIZ) == NULL)) | |
229 | return -EINVAL; | |
230 | } | |
2dbba6f7 | 231 | |
e5dcecba | 232 | /* special-case our own group and hacks */ |
2a94fe48 JB |
233 | if (family == &genl_ctrl) { |
234 | first_id = GENL_ID_CTRL; | |
235 | BUG_ON(n_groups != 1); | |
236 | } else if (strcmp(family->name, "NET_DM") == 0) { | |
237 | first_id = 1; | |
238 | BUG_ON(n_groups != 1); | |
239 | } else if (strcmp(family->name, "VFS_DQUOT") == 0) { | |
240 | first_id = GENL_ID_VFS_DQUOT; | |
241 | BUG_ON(n_groups != 1); | |
242 | } else { | |
243 | groups_allocated = true; | |
244 | err = genl_allocate_reserve_groups(n_groups, &first_id); | |
245 | if (err) | |
246 | return err; | |
2dbba6f7 JB |
247 | } |
248 | ||
2a94fe48 JB |
249 | family->mcgrp_offset = first_id; |
250 | ||
251 | /* if still initializing, can't and don't need to to realloc bitmaps */ | |
252 | if (!init_net.genl_sock) | |
253 | return 0; | |
254 | ||
134e6375 JB |
255 | if (family->netnsok) { |
256 | struct net *net; | |
257 | ||
d136f1bd | 258 | netlink_table_grab(); |
134e6375 JB |
259 | rcu_read_lock(); |
260 | for_each_net_rcu(net) { | |
d136f1bd | 261 | err = __netlink_change_ngroups(net->genl_sock, |
134e6375 JB |
262 | mc_groups_longs * BITS_PER_LONG); |
263 | if (err) { | |
264 | /* | |
265 | * No need to roll back, can only fail if | |
266 | * memory allocation fails and then the | |
267 | * number of _possible_ groups has been | |
268 | * increased on some sockets which is ok. | |
269 | */ | |
2a94fe48 | 270 | break; |
134e6375 JB |
271 | } |
272 | } | |
273 | rcu_read_unlock(); | |
d136f1bd | 274 | netlink_table_ungrab(); |
134e6375 JB |
275 | } else { |
276 | err = netlink_change_ngroups(init_net.genl_sock, | |
277 | mc_groups_longs * BITS_PER_LONG); | |
134e6375 | 278 | } |
2dbba6f7 | 279 | |
2a94fe48 JB |
280 | if (groups_allocated && err) { |
281 | for (i = 0; i < family->n_mcgrps; i++) | |
282 | clear_bit(family->mcgrp_offset + i, mc_groups); | |
283 | } | |
2dbba6f7 | 284 | |
79d310d0 | 285 | return err; |
2dbba6f7 | 286 | } |
2dbba6f7 | 287 | |
2a94fe48 | 288 | static void genl_unregister_mc_groups(struct genl_family *family) |
79dc4386 | 289 | { |
134e6375 | 290 | struct net *net; |
2a94fe48 | 291 | int i; |
134e6375 | 292 | |
b8273570 | 293 | netlink_table_grab(); |
134e6375 | 294 | rcu_read_lock(); |
2a94fe48 JB |
295 | for_each_net_rcu(net) { |
296 | for (i = 0; i < family->n_mcgrps; i++) | |
297 | __netlink_clear_multicast_users( | |
298 | net->genl_sock, family->mcgrp_offset + i); | |
299 | } | |
134e6375 | 300 | rcu_read_unlock(); |
b8273570 | 301 | netlink_table_ungrab(); |
134e6375 | 302 | |
2a94fe48 JB |
303 | for (i = 0; i < family->n_mcgrps; i++) { |
304 | int grp_id = family->mcgrp_offset + i; | |
2dbba6f7 | 305 | |
2a94fe48 JB |
306 | if (grp_id != 1) |
307 | clear_bit(grp_id, mc_groups); | |
308 | genl_ctrl_event(CTRL_CMD_DELMCAST_GRP, family, | |
309 | &family->mcgrps[i], grp_id); | |
310 | } | |
2dbba6f7 JB |
311 | } |
312 | ||
568508aa | 313 | static int genl_validate_ops(struct genl_family *family) |
482a8524 | 314 | { |
568508aa JB |
315 | const struct genl_ops *ops = family->ops; |
316 | unsigned int n_ops = family->n_ops; | |
d91824c0 JB |
317 | int i, j; |
318 | ||
568508aa JB |
319 | if (WARN_ON(n_ops && !ops)) |
320 | return -EINVAL; | |
321 | ||
322 | if (!n_ops) | |
323 | return 0; | |
324 | ||
d91824c0 JB |
325 | for (i = 0; i < n_ops; i++) { |
326 | if (ops[i].dumpit == NULL && ops[i].doit == NULL) | |
327 | return -EINVAL; | |
328 | for (j = i + 1; j < n_ops; j++) | |
329 | if (ops[i].cmd == ops[j].cmd) | |
330 | return -EINVAL; | |
482a8524 TG |
331 | } |
332 | ||
d91824c0 JB |
333 | /* family is not registered yet, so no locking needed */ |
334 | family->ops = ops; | |
335 | family->n_ops = n_ops; | |
482a8524 | 336 | |
d91824c0 | 337 | return 0; |
482a8524 | 338 | } |
482a8524 TG |
339 | |
340 | /** | |
33c6b1f6 | 341 | * __genl_register_family - register a generic netlink family |
482a8524 TG |
342 | * @family: generic netlink family |
343 | * | |
344 | * Registers the specified family after validating it first. Only one | |
345 | * family may be registered with the same family name or identifier. | |
346 | * The family id may equal GENL_ID_GENERATE causing an unique id to | |
347 | * be automatically generated and assigned. | |
348 | * | |
568508aa JB |
349 | * The family's ops array must already be assigned, you can use the |
350 | * genl_register_family_with_ops() helper function. | |
351 | * | |
482a8524 TG |
352 | * Return 0 on success or a negative error code. |
353 | */ | |
33c6b1f6 | 354 | int __genl_register_family(struct genl_family *family) |
482a8524 | 355 | { |
2a94fe48 | 356 | int err = -EINVAL, i; |
482a8524 TG |
357 | |
358 | if (family->id && family->id < GENL_MIN_ID) | |
359 | goto errout; | |
360 | ||
361 | if (family->id > GENL_MAX_ID) | |
362 | goto errout; | |
363 | ||
568508aa JB |
364 | err = genl_validate_ops(family); |
365 | if (err) | |
366 | return err; | |
367 | ||
def31174 | 368 | genl_lock_all(); |
482a8524 TG |
369 | |
370 | if (genl_family_find_byname(family->name)) { | |
371 | err = -EEXIST; | |
372 | goto errout_locked; | |
373 | } | |
374 | ||
482a8524 TG |
375 | if (family->id == GENL_ID_GENERATE) { |
376 | u16 newid = genl_generate_id(); | |
377 | ||
378 | if (!newid) { | |
379 | err = -ENOMEM; | |
380 | goto errout_locked; | |
381 | } | |
382 | ||
383 | family->id = newid; | |
93860b08 KK |
384 | } else if (genl_family_find_byid(family->id)) { |
385 | err = -EEXIST; | |
386 | goto errout_locked; | |
482a8524 TG |
387 | } |
388 | ||
def31174 | 389 | if (family->maxattr && !family->parallel_ops) { |
482a8524 TG |
390 | family->attrbuf = kmalloc((family->maxattr+1) * |
391 | sizeof(struct nlattr *), GFP_KERNEL); | |
392 | if (family->attrbuf == NULL) { | |
393 | err = -ENOMEM; | |
e200bd80 | 394 | goto errout_locked; |
482a8524 TG |
395 | } |
396 | } else | |
397 | family->attrbuf = NULL; | |
398 | ||
2a94fe48 JB |
399 | err = genl_validate_assign_mc_groups(family); |
400 | if (err) | |
401 | goto errout_locked; | |
402 | ||
482a8524 | 403 | list_add_tail(&family->family_list, genl_family_chain(family->id)); |
def31174 | 404 | genl_unlock_all(); |
482a8524 | 405 | |
2a94fe48 JB |
406 | /* send all events */ |
407 | genl_ctrl_event(CTRL_CMD_NEWFAMILY, family, NULL, 0); | |
408 | for (i = 0; i < family->n_mcgrps; i++) | |
409 | genl_ctrl_event(CTRL_CMD_NEWMCAST_GRP, family, | |
410 | &family->mcgrps[i], family->mcgrp_offset + i); | |
482a8524 TG |
411 | |
412 | return 0; | |
413 | ||
414 | errout_locked: | |
def31174 | 415 | genl_unlock_all(); |
482a8524 TG |
416 | errout: |
417 | return err; | |
418 | } | |
33c6b1f6 | 419 | EXPORT_SYMBOL(__genl_register_family); |
482a8524 TG |
420 | |
421 | /** | |
422 | * genl_unregister_family - unregister generic netlink family | |
423 | * @family: generic netlink family | |
424 | * | |
425 | * Unregisters the specified family. | |
426 | * | |
427 | * Returns 0 on success or a negative error code. | |
428 | */ | |
429 | int genl_unregister_family(struct genl_family *family) | |
430 | { | |
431 | struct genl_family *rc; | |
432 | ||
def31174 | 433 | genl_lock_all(); |
482a8524 | 434 | |
910d6c32 PE |
435 | genl_unregister_mc_groups(family); |
436 | ||
482a8524 TG |
437 | list_for_each_entry(rc, genl_family_chain(family->id), family_list) { |
438 | if (family->id != rc->id || strcmp(rc->name, family->name)) | |
439 | continue; | |
440 | ||
441 | list_del(&rc->family_list); | |
d91824c0 | 442 | family->n_ops = 0; |
def31174 | 443 | genl_unlock_all(); |
482a8524 | 444 | |
482a8524 | 445 | kfree(family->attrbuf); |
2a94fe48 | 446 | genl_ctrl_event(CTRL_CMD_DELFAMILY, family, NULL, 0); |
482a8524 TG |
447 | return 0; |
448 | } | |
449 | ||
def31174 | 450 | genl_unlock_all(); |
482a8524 TG |
451 | |
452 | return -ENOENT; | |
453 | } | |
416c2f9c | 454 | EXPORT_SYMBOL(genl_unregister_family); |
482a8524 | 455 | |
a46621a3 DV |
456 | /** |
457 | * genlmsg_put - Add generic netlink header to netlink message | |
458 | * @skb: socket buffer holding the message | |
15e47304 | 459 | * @portid: netlink portid the message is addressed to |
a46621a3 DV |
460 | * @seq: sequence number (usually the one of the sender) |
461 | * @family: generic netlink family | |
2c53040f | 462 | * @flags: netlink message flags |
a46621a3 DV |
463 | * @cmd: generic netlink command |
464 | * | |
465 | * Returns pointer to user specific header | |
466 | */ | |
15e47304 | 467 | void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, |
a46621a3 DV |
468 | struct genl_family *family, int flags, u8 cmd) |
469 | { | |
470 | struct nlmsghdr *nlh; | |
471 | struct genlmsghdr *hdr; | |
472 | ||
15e47304 | 473 | nlh = nlmsg_put(skb, portid, seq, family->id, GENL_HDRLEN + |
a46621a3 DV |
474 | family->hdrsize, flags); |
475 | if (nlh == NULL) | |
476 | return NULL; | |
477 | ||
478 | hdr = nlmsg_data(nlh); | |
479 | hdr->cmd = cmd; | |
480 | hdr->version = family->version; | |
481 | hdr->reserved = 0; | |
482 | ||
483 | return (char *) hdr + GENL_HDRLEN; | |
484 | } | |
485 | EXPORT_SYMBOL(genlmsg_put); | |
486 | ||
9b96309c PS |
487 | static int genl_lock_dumpit(struct sk_buff *skb, struct netlink_callback *cb) |
488 | { | |
f84f771d JB |
489 | /* our ops are always const - netlink API doesn't propagate that */ |
490 | const struct genl_ops *ops = cb->data; | |
9b96309c PS |
491 | int rc; |
492 | ||
493 | genl_lock(); | |
494 | rc = ops->dumpit(skb, cb); | |
495 | genl_unlock(); | |
496 | return rc; | |
497 | } | |
498 | ||
499 | static int genl_lock_done(struct netlink_callback *cb) | |
500 | { | |
f84f771d JB |
501 | /* our ops are always const - netlink API doesn't propagate that */ |
502 | const struct genl_ops *ops = cb->data; | |
9b96309c PS |
503 | int rc = 0; |
504 | ||
505 | if (ops->done) { | |
506 | genl_lock(); | |
507 | rc = ops->done(cb); | |
508 | genl_unlock(); | |
509 | } | |
510 | return rc; | |
511 | } | |
512 | ||
def31174 PS |
513 | static int genl_family_rcv_msg(struct genl_family *family, |
514 | struct sk_buff *skb, | |
515 | struct nlmsghdr *nlh) | |
482a8524 | 516 | { |
f84f771d | 517 | const struct genl_ops *ops; |
134e6375 | 518 | struct net *net = sock_net(skb->sk); |
482a8524 TG |
519 | struct genl_info info; |
520 | struct genlmsghdr *hdr = nlmsg_data(nlh); | |
def31174 | 521 | struct nlattr **attrbuf; |
1d00a4eb | 522 | int hdrlen, err; |
482a8524 | 523 | |
134e6375 JB |
524 | /* this family doesn't exist in this netns */ |
525 | if (!family->netnsok && !net_eq(net, &init_net)) | |
526 | return -ENOENT; | |
527 | ||
482a8524 TG |
528 | hdrlen = GENL_HDRLEN + family->hdrsize; |
529 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) | |
1d00a4eb | 530 | return -EINVAL; |
482a8524 TG |
531 | |
532 | ops = genl_get_cmd(hdr->cmd, family); | |
1d00a4eb TG |
533 | if (ops == NULL) |
534 | return -EOPNOTSUPP; | |
482a8524 | 535 | |
1d00a4eb | 536 | if ((ops->flags & GENL_ADMIN_PERM) && |
fd778461 | 537 | !capable(CAP_NET_ADMIN)) |
1d00a4eb | 538 | return -EPERM; |
482a8524 | 539 | |
e1ee3673 | 540 | if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) { |
9b96309c | 541 | int rc; |
def31174 | 542 | |
1d00a4eb TG |
543 | if (ops->dumpit == NULL) |
544 | return -EOPNOTSUPP; | |
482a8524 | 545 | |
9b96309c PS |
546 | if (!family->parallel_ops) { |
547 | struct netlink_dump_control c = { | |
33c6b1f6 | 548 | .module = family->module, |
f84f771d JB |
549 | /* we have const, but the netlink API doesn't */ |
550 | .data = (void *)ops, | |
9b96309c PS |
551 | .dump = genl_lock_dumpit, |
552 | .done = genl_lock_done, | |
553 | }; | |
554 | ||
555 | genl_unlock(); | |
33c6b1f6 | 556 | rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c); |
9b96309c PS |
557 | genl_lock(); |
558 | ||
559 | } else { | |
560 | struct netlink_dump_control c = { | |
33c6b1f6 | 561 | .module = family->module, |
9b96309c PS |
562 | .dump = ops->dumpit, |
563 | .done = ops->done, | |
564 | }; | |
565 | ||
33c6b1f6 | 566 | rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c); |
9b96309c PS |
567 | } |
568 | ||
569 | return rc; | |
482a8524 TG |
570 | } |
571 | ||
1d00a4eb TG |
572 | if (ops->doit == NULL) |
573 | return -EOPNOTSUPP; | |
482a8524 | 574 | |
def31174 PS |
575 | if (family->maxattr && family->parallel_ops) { |
576 | attrbuf = kmalloc((family->maxattr+1) * | |
577 | sizeof(struct nlattr *), GFP_KERNEL); | |
578 | if (attrbuf == NULL) | |
579 | return -ENOMEM; | |
580 | } else | |
581 | attrbuf = family->attrbuf; | |
582 | ||
583 | if (attrbuf) { | |
584 | err = nlmsg_parse(nlh, hdrlen, attrbuf, family->maxattr, | |
482a8524 TG |
585 | ops->policy); |
586 | if (err < 0) | |
50754d21 | 587 | goto out; |
482a8524 TG |
588 | } |
589 | ||
590 | info.snd_seq = nlh->nlmsg_seq; | |
15e47304 | 591 | info.snd_portid = NETLINK_CB(skb).portid; |
482a8524 TG |
592 | info.nlhdr = nlh; |
593 | info.genlhdr = nlmsg_data(nlh); | |
594 | info.userhdr = nlmsg_data(nlh) + GENL_HDRLEN; | |
def31174 | 595 | info.attrs = attrbuf; |
134e6375 | 596 | genl_info_net_set(&info, net); |
ff4c92d8 | 597 | memset(&info.user_ptr, 0, sizeof(info.user_ptr)); |
482a8524 | 598 | |
ff4c92d8 JB |
599 | if (family->pre_doit) { |
600 | err = family->pre_doit(ops, skb, &info); | |
601 | if (err) | |
50754d21 | 602 | goto out; |
ff4c92d8 JB |
603 | } |
604 | ||
605 | err = ops->doit(skb, &info); | |
606 | ||
607 | if (family->post_doit) | |
608 | family->post_doit(ops, skb, &info); | |
609 | ||
50754d21 | 610 | out: |
def31174 PS |
611 | if (family->parallel_ops) |
612 | kfree(attrbuf); | |
613 | ||
614 | return err; | |
615 | } | |
616 | ||
617 | static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
618 | { | |
619 | struct genl_family *family; | |
620 | int err; | |
621 | ||
622 | family = genl_family_find_byid(nlh->nlmsg_type); | |
623 | if (family == NULL) | |
624 | return -ENOENT; | |
625 | ||
626 | if (!family->parallel_ops) | |
627 | genl_lock(); | |
628 | ||
629 | err = genl_family_rcv_msg(family, skb, nlh); | |
630 | ||
631 | if (!family->parallel_ops) | |
632 | genl_unlock(); | |
633 | ||
ff4c92d8 | 634 | return err; |
482a8524 TG |
635 | } |
636 | ||
cd40b7d3 | 637 | static void genl_rcv(struct sk_buff *skb) |
482a8524 | 638 | { |
def31174 | 639 | down_read(&cb_lock); |
cd40b7d3 | 640 | netlink_rcv_skb(skb, &genl_rcv_msg); |
def31174 | 641 | up_read(&cb_lock); |
482a8524 TG |
642 | } |
643 | ||
644 | /************************************************************************** | |
645 | * Controller | |
646 | **************************************************************************/ | |
647 | ||
17c157c8 TG |
648 | static struct genl_family genl_ctrl = { |
649 | .id = GENL_ID_CTRL, | |
650 | .name = "nlctrl", | |
334c29a6 | 651 | .version = 0x2, |
17c157c8 | 652 | .maxattr = CTRL_ATTR_MAX, |
134e6375 | 653 | .netnsok = true, |
17c157c8 TG |
654 | }; |
655 | ||
15e47304 | 656 | static int ctrl_fill_info(struct genl_family *family, u32 portid, u32 seq, |
482a8524 TG |
657 | u32 flags, struct sk_buff *skb, u8 cmd) |
658 | { | |
659 | void *hdr; | |
660 | ||
15e47304 | 661 | hdr = genlmsg_put(skb, portid, seq, &genl_ctrl, flags, cmd); |
482a8524 TG |
662 | if (hdr == NULL) |
663 | return -1; | |
664 | ||
444653f6 DM |
665 | if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) || |
666 | nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id) || | |
667 | nla_put_u32(skb, CTRL_ATTR_VERSION, family->version) || | |
668 | nla_put_u32(skb, CTRL_ATTR_HDRSIZE, family->hdrsize) || | |
669 | nla_put_u32(skb, CTRL_ATTR_MAXATTR, family->maxattr)) | |
670 | goto nla_put_failure; | |
eb328111 | 671 | |
d91824c0 | 672 | if (family->n_ops) { |
e94ef682 | 673 | struct nlattr *nla_ops; |
d91824c0 | 674 | int i; |
eb328111 | 675 | |
e94ef682 TG |
676 | nla_ops = nla_nest_start(skb, CTRL_ATTR_OPS); |
677 | if (nla_ops == NULL) | |
eb328111 TG |
678 | goto nla_put_failure; |
679 | ||
d91824c0 | 680 | for (i = 0; i < family->n_ops; i++) { |
e94ef682 | 681 | struct nlattr *nest; |
f84f771d | 682 | const struct genl_ops *ops = &family->ops[i]; |
029b234f | 683 | u32 op_flags = ops->flags; |
f84f771d JB |
684 | |
685 | if (ops->dumpit) | |
029b234f | 686 | op_flags |= GENL_CMD_CAP_DUMP; |
f84f771d | 687 | if (ops->doit) |
029b234f | 688 | op_flags |= GENL_CMD_CAP_DO; |
f84f771d | 689 | if (ops->policy) |
029b234f | 690 | op_flags |= GENL_CMD_CAP_HASPOL; |
eb328111 | 691 | |
d91824c0 | 692 | nest = nla_nest_start(skb, i + 1); |
e94ef682 TG |
693 | if (nest == NULL) |
694 | goto nla_put_failure; | |
eb328111 | 695 | |
444653f6 | 696 | if (nla_put_u32(skb, CTRL_ATTR_OP_ID, ops->cmd) || |
029b234f | 697 | nla_put_u32(skb, CTRL_ATTR_OP_FLAGS, op_flags)) |
444653f6 | 698 | goto nla_put_failure; |
eb328111 | 699 | |
e94ef682 TG |
700 | nla_nest_end(skb, nest); |
701 | } | |
702 | ||
703 | nla_nest_end(skb, nla_ops); | |
704 | } | |
482a8524 | 705 | |
2a94fe48 | 706 | if (family->n_mcgrps) { |
2dbba6f7 | 707 | struct nlattr *nla_grps; |
2a94fe48 | 708 | int i; |
2dbba6f7 JB |
709 | |
710 | nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS); | |
711 | if (nla_grps == NULL) | |
712 | goto nla_put_failure; | |
713 | ||
2a94fe48 | 714 | for (i = 0; i < family->n_mcgrps; i++) { |
2dbba6f7 | 715 | struct nlattr *nest; |
2a94fe48 | 716 | const struct genl_multicast_group *grp; |
2dbba6f7 | 717 | |
2a94fe48 JB |
718 | grp = &family->mcgrps[i]; |
719 | ||
720 | nest = nla_nest_start(skb, i + 1); | |
2dbba6f7 JB |
721 | if (nest == NULL) |
722 | goto nla_put_failure; | |
723 | ||
2a94fe48 JB |
724 | if (nla_put_u32(skb, CTRL_ATTR_MCAST_GRP_ID, |
725 | family->mcgrp_offset + i) || | |
444653f6 DM |
726 | nla_put_string(skb, CTRL_ATTR_MCAST_GRP_NAME, |
727 | grp->name)) | |
728 | goto nla_put_failure; | |
2dbba6f7 JB |
729 | |
730 | nla_nest_end(skb, nest); | |
731 | } | |
732 | nla_nest_end(skb, nla_grps); | |
733 | } | |
734 | ||
735 | return genlmsg_end(skb, hdr); | |
736 | ||
737 | nla_put_failure: | |
bc3ed28c TG |
738 | genlmsg_cancel(skb, hdr); |
739 | return -EMSGSIZE; | |
2dbba6f7 JB |
740 | } |
741 | ||
c2ebb908 | 742 | static int ctrl_fill_mcgrp_info(struct genl_family *family, |
2a94fe48 JB |
743 | const struct genl_multicast_group *grp, |
744 | int grp_id, u32 portid, u32 seq, u32 flags, | |
745 | struct sk_buff *skb, u8 cmd) | |
2dbba6f7 JB |
746 | { |
747 | void *hdr; | |
748 | struct nlattr *nla_grps; | |
749 | struct nlattr *nest; | |
750 | ||
15e47304 | 751 | hdr = genlmsg_put(skb, portid, seq, &genl_ctrl, flags, cmd); |
2dbba6f7 JB |
752 | if (hdr == NULL) |
753 | return -1; | |
754 | ||
c2ebb908 JB |
755 | if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) || |
756 | nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id)) | |
444653f6 | 757 | goto nla_put_failure; |
2dbba6f7 JB |
758 | |
759 | nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS); | |
760 | if (nla_grps == NULL) | |
761 | goto nla_put_failure; | |
762 | ||
763 | nest = nla_nest_start(skb, 1); | |
764 | if (nest == NULL) | |
765 | goto nla_put_failure; | |
766 | ||
2a94fe48 | 767 | if (nla_put_u32(skb, CTRL_ATTR_MCAST_GRP_ID, grp_id) || |
444653f6 DM |
768 | nla_put_string(skb, CTRL_ATTR_MCAST_GRP_NAME, |
769 | grp->name)) | |
770 | goto nla_put_failure; | |
2dbba6f7 JB |
771 | |
772 | nla_nest_end(skb, nest); | |
773 | nla_nest_end(skb, nla_grps); | |
774 | ||
482a8524 TG |
775 | return genlmsg_end(skb, hdr); |
776 | ||
777 | nla_put_failure: | |
bc3ed28c TG |
778 | genlmsg_cancel(skb, hdr); |
779 | return -EMSGSIZE; | |
482a8524 TG |
780 | } |
781 | ||
782 | static int ctrl_dumpfamily(struct sk_buff *skb, struct netlink_callback *cb) | |
783 | { | |
784 | ||
785 | int i, n = 0; | |
786 | struct genl_family *rt; | |
134e6375 | 787 | struct net *net = sock_net(skb->sk); |
482a8524 TG |
788 | int chains_to_skip = cb->args[0]; |
789 | int fams_to_skip = cb->args[1]; | |
790 | ||
e1d5a010 | 791 | for (i = chains_to_skip; i < GENL_FAM_TAB_SIZE; i++) { |
482a8524 TG |
792 | n = 0; |
793 | list_for_each_entry(rt, genl_family_chain(i), family_list) { | |
134e6375 JB |
794 | if (!rt->netnsok && !net_eq(net, &init_net)) |
795 | continue; | |
482a8524 TG |
796 | if (++n < fams_to_skip) |
797 | continue; | |
15e47304 | 798 | if (ctrl_fill_info(rt, NETLINK_CB(cb->skb).portid, |
482a8524 TG |
799 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
800 | skb, CTRL_CMD_NEWFAMILY) < 0) | |
801 | goto errout; | |
802 | } | |
803 | ||
804 | fams_to_skip = 0; | |
805 | } | |
806 | ||
807 | errout: | |
808 | cb->args[0] = i; | |
809 | cb->args[1] = n; | |
810 | ||
811 | return skb->len; | |
812 | } | |
813 | ||
2dbba6f7 | 814 | static struct sk_buff *ctrl_build_family_msg(struct genl_family *family, |
15e47304 | 815 | u32 portid, int seq, u8 cmd) |
482a8524 TG |
816 | { |
817 | struct sk_buff *skb; | |
818 | int err; | |
819 | ||
339bf98f | 820 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
482a8524 TG |
821 | if (skb == NULL) |
822 | return ERR_PTR(-ENOBUFS); | |
823 | ||
15e47304 | 824 | err = ctrl_fill_info(family, portid, seq, 0, skb, cmd); |
482a8524 TG |
825 | if (err < 0) { |
826 | nlmsg_free(skb); | |
827 | return ERR_PTR(err); | |
828 | } | |
829 | ||
830 | return skb; | |
831 | } | |
832 | ||
2a94fe48 JB |
833 | static struct sk_buff * |
834 | ctrl_build_mcgrp_msg(struct genl_family *family, | |
835 | const struct genl_multicast_group *grp, | |
836 | int grp_id, u32 portid, int seq, u8 cmd) | |
2dbba6f7 JB |
837 | { |
838 | struct sk_buff *skb; | |
839 | int err; | |
840 | ||
841 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
842 | if (skb == NULL) | |
843 | return ERR_PTR(-ENOBUFS); | |
844 | ||
2a94fe48 JB |
845 | err = ctrl_fill_mcgrp_info(family, grp, grp_id, portid, |
846 | seq, 0, skb, cmd); | |
2dbba6f7 JB |
847 | if (err < 0) { |
848 | nlmsg_free(skb); | |
849 | return ERR_PTR(err); | |
850 | } | |
851 | ||
852 | return skb; | |
853 | } | |
854 | ||
ef7c79ed | 855 | static const struct nla_policy ctrl_policy[CTRL_ATTR_MAX+1] = { |
482a8524 | 856 | [CTRL_ATTR_FAMILY_ID] = { .type = NLA_U16 }, |
5176f91e TG |
857 | [CTRL_ATTR_FAMILY_NAME] = { .type = NLA_NUL_STRING, |
858 | .len = GENL_NAMSIZ - 1 }, | |
482a8524 TG |
859 | }; |
860 | ||
861 | static int ctrl_getfamily(struct sk_buff *skb, struct genl_info *info) | |
862 | { | |
863 | struct sk_buff *msg; | |
864 | struct genl_family *res = NULL; | |
865 | int err = -EINVAL; | |
866 | ||
867 | if (info->attrs[CTRL_ATTR_FAMILY_ID]) { | |
868 | u16 id = nla_get_u16(info->attrs[CTRL_ATTR_FAMILY_ID]); | |
869 | res = genl_family_find_byid(id); | |
134e6375 | 870 | err = -ENOENT; |
482a8524 TG |
871 | } |
872 | ||
873 | if (info->attrs[CTRL_ATTR_FAMILY_NAME]) { | |
5176f91e | 874 | char *name; |
482a8524 | 875 | |
5176f91e | 876 | name = nla_data(info->attrs[CTRL_ATTR_FAMILY_NAME]); |
482a8524 | 877 | res = genl_family_find_byname(name); |
fa843095 SH |
878 | #ifdef CONFIG_MODULES |
879 | if (res == NULL) { | |
880 | genl_unlock(); | |
c74f2b26 | 881 | up_read(&cb_lock); |
e9412c37 | 882 | request_module("net-pf-%d-proto-%d-family-%s", |
fa843095 | 883 | PF_NETLINK, NETLINK_GENERIC, name); |
c74f2b26 | 884 | down_read(&cb_lock); |
fa843095 SH |
885 | genl_lock(); |
886 | res = genl_family_find_byname(name); | |
887 | } | |
888 | #endif | |
134e6375 | 889 | err = -ENOENT; |
482a8524 TG |
890 | } |
891 | ||
134e6375 JB |
892 | if (res == NULL) |
893 | return err; | |
894 | ||
895 | if (!res->netnsok && !net_eq(genl_info_net(info), &init_net)) { | |
896 | /* family doesn't exist here */ | |
897 | return -ENOENT; | |
482a8524 TG |
898 | } |
899 | ||
15e47304 | 900 | msg = ctrl_build_family_msg(res, info->snd_portid, info->snd_seq, |
2dbba6f7 | 901 | CTRL_CMD_NEWFAMILY); |
134e6375 JB |
902 | if (IS_ERR(msg)) |
903 | return PTR_ERR(msg); | |
482a8524 | 904 | |
134e6375 | 905 | return genlmsg_reply(msg, info); |
482a8524 TG |
906 | } |
907 | ||
c2ebb908 | 908 | static int genl_ctrl_event(int event, struct genl_family *family, |
2a94fe48 JB |
909 | const struct genl_multicast_group *grp, |
910 | int grp_id) | |
482a8524 TG |
911 | { |
912 | struct sk_buff *msg; | |
913 | ||
134e6375 JB |
914 | /* genl is still initialising */ |
915 | if (!init_net.genl_sock) | |
482a8524 TG |
916 | return 0; |
917 | ||
918 | switch (event) { | |
919 | case CTRL_CMD_NEWFAMILY: | |
920 | case CTRL_CMD_DELFAMILY: | |
c2ebb908 | 921 | WARN_ON(grp); |
134e6375 | 922 | msg = ctrl_build_family_msg(family, 0, 0, event); |
2dbba6f7 JB |
923 | break; |
924 | case CTRL_CMD_NEWMCAST_GRP: | |
925 | case CTRL_CMD_DELMCAST_GRP: | |
c2ebb908 | 926 | BUG_ON(!grp); |
2a94fe48 | 927 | msg = ctrl_build_mcgrp_msg(family, grp, grp_id, 0, 0, event); |
482a8524 | 928 | break; |
134e6375 JB |
929 | default: |
930 | return -EINVAL; | |
931 | } | |
932 | ||
933 | if (IS_ERR(msg)) | |
934 | return PTR_ERR(msg); | |
935 | ||
936 | if (!family->netnsok) { | |
68eb5503 | 937 | genlmsg_multicast_netns(&genl_ctrl, &init_net, msg, 0, |
2a94fe48 | 938 | 0, GFP_KERNEL); |
134e6375 JB |
939 | } else { |
940 | rcu_read_lock(); | |
68eb5503 | 941 | genlmsg_multicast_allns(&genl_ctrl, msg, 0, |
2a94fe48 | 942 | 0, GFP_ATOMIC); |
134e6375 | 943 | rcu_read_unlock(); |
482a8524 TG |
944 | } |
945 | ||
946 | return 0; | |
947 | } | |
948 | ||
c53ed742 JB |
949 | static struct genl_ops genl_ctrl_ops[] = { |
950 | { | |
951 | .cmd = CTRL_CMD_GETFAMILY, | |
952 | .doit = ctrl_getfamily, | |
953 | .dumpit = ctrl_dumpfamily, | |
954 | .policy = ctrl_policy, | |
955 | }, | |
482a8524 TG |
956 | }; |
957 | ||
2a94fe48 JB |
958 | static struct genl_multicast_group genl_ctrl_groups[] = { |
959 | { .name = "notify", }, | |
2dbba6f7 JB |
960 | }; |
961 | ||
134e6375 JB |
962 | static int __net_init genl_pernet_init(struct net *net) |
963 | { | |
a31f2d17 PNA |
964 | struct netlink_kernel_cfg cfg = { |
965 | .input = genl_rcv, | |
9785e10a | 966 | .flags = NL_CFG_F_NONROOT_RECV, |
a31f2d17 PNA |
967 | }; |
968 | ||
134e6375 | 969 | /* we'll bump the group number right afterwards */ |
9f00d977 | 970 | net->genl_sock = netlink_kernel_create(net, NETLINK_GENERIC, &cfg); |
134e6375 JB |
971 | |
972 | if (!net->genl_sock && net_eq(net, &init_net)) | |
973 | panic("GENL: Cannot initialize generic netlink\n"); | |
974 | ||
975 | if (!net->genl_sock) | |
976 | return -ENOMEM; | |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
981 | static void __net_exit genl_pernet_exit(struct net *net) | |
982 | { | |
983 | netlink_kernel_release(net->genl_sock); | |
984 | net->genl_sock = NULL; | |
985 | } | |
986 | ||
987 | static struct pernet_operations genl_pernet_ops = { | |
988 | .init = genl_pernet_init, | |
989 | .exit = genl_pernet_exit, | |
990 | }; | |
991 | ||
482a8524 TG |
992 | static int __init genl_init(void) |
993 | { | |
994 | int i, err; | |
995 | ||
996 | for (i = 0; i < GENL_FAM_TAB_SIZE; i++) | |
997 | INIT_LIST_HEAD(&family_ht[i]); | |
998 | ||
2a94fe48 JB |
999 | err = genl_register_family_with_ops_groups(&genl_ctrl, genl_ctrl_ops, |
1000 | genl_ctrl_groups); | |
482a8524 | 1001 | if (err < 0) |
134e6375 | 1002 | goto problem; |
482a8524 | 1003 | |
134e6375 JB |
1004 | err = register_pernet_subsys(&genl_pernet_ops); |
1005 | if (err) | |
1006 | goto problem; | |
482a8524 TG |
1007 | |
1008 | return 0; | |
1009 | ||
134e6375 | 1010 | problem: |
482a8524 | 1011 | panic("GENL: Cannot register controller: %d\n", err); |
482a8524 TG |
1012 | } |
1013 | ||
1014 | subsys_initcall(genl_init); | |
1015 | ||
15e47304 | 1016 | static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group, |
134e6375 JB |
1017 | gfp_t flags) |
1018 | { | |
1019 | struct sk_buff *tmp; | |
1020 | struct net *net, *prev = NULL; | |
1021 | int err; | |
1022 | ||
1023 | for_each_net_rcu(net) { | |
1024 | if (prev) { | |
1025 | tmp = skb_clone(skb, flags); | |
1026 | if (!tmp) { | |
1027 | err = -ENOMEM; | |
1028 | goto error; | |
1029 | } | |
1030 | err = nlmsg_multicast(prev->genl_sock, tmp, | |
15e47304 | 1031 | portid, group, flags); |
134e6375 JB |
1032 | if (err) |
1033 | goto error; | |
1034 | } | |
1035 | ||
1036 | prev = net; | |
1037 | } | |
1038 | ||
15e47304 | 1039 | return nlmsg_multicast(prev->genl_sock, skb, portid, group, flags); |
134e6375 JB |
1040 | error: |
1041 | kfree_skb(skb); | |
1042 | return err; | |
1043 | } | |
1044 | ||
68eb5503 JB |
1045 | int genlmsg_multicast_allns(struct genl_family *family, struct sk_buff *skb, |
1046 | u32 portid, unsigned int group, gfp_t flags) | |
134e6375 | 1047 | { |
2a94fe48 JB |
1048 | if (group >= family->n_mcgrps) |
1049 | return -EINVAL; | |
1050 | group = family->mcgrp_offset + group; | |
15e47304 | 1051 | return genlmsg_mcast(skb, portid, group, flags); |
134e6375 JB |
1052 | } |
1053 | EXPORT_SYMBOL(genlmsg_multicast_allns); | |
263ba61d | 1054 | |
68eb5503 JB |
1055 | void genl_notify(struct genl_family *family, |
1056 | struct sk_buff *skb, struct net *net, u32 portid, u32 group, | |
263ba61d PS |
1057 | struct nlmsghdr *nlh, gfp_t flags) |
1058 | { | |
1059 | struct sock *sk = net->genl_sock; | |
1060 | int report = 0; | |
1061 | ||
1062 | if (nlh) | |
1063 | report = nlmsg_report(nlh); | |
1064 | ||
2a94fe48 JB |
1065 | if (group >= family->n_mcgrps) |
1066 | return; | |
1067 | group = family->mcgrp_offset + group; | |
15e47304 | 1068 | nlmsg_notify(sk, skb, portid, group, report, flags); |
263ba61d PS |
1069 | } |
1070 | EXPORT_SYMBOL(genl_notify); |