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 | |
ee1c2442 JB |
26 | atomic_t genl_sk_destructing_cnt = ATOMIC_INIT(0); |
27 | DECLARE_WAIT_QUEUE_HEAD(genl_sk_destructing_waitq); | |
28 | ||
f408e0ce | 29 | void genl_lock(void) |
482a8524 | 30 | { |
14cc3e2b | 31 | mutex_lock(&genl_mutex); |
482a8524 | 32 | } |
f408e0ce | 33 | EXPORT_SYMBOL(genl_lock); |
482a8524 | 34 | |
f408e0ce | 35 | void genl_unlock(void) |
482a8524 | 36 | { |
14cc3e2b | 37 | mutex_unlock(&genl_mutex); |
482a8524 | 38 | } |
f408e0ce | 39 | EXPORT_SYMBOL(genl_unlock); |
482a8524 | 40 | |
320f5ea0 | 41 | #ifdef CONFIG_LOCKDEP |
61d03535 | 42 | bool lockdep_genl_is_held(void) |
86b1309c PS |
43 | { |
44 | return lockdep_is_held(&genl_mutex); | |
45 | } | |
46 | EXPORT_SYMBOL(lockdep_genl_is_held); | |
47 | #endif | |
48 | ||
def31174 PS |
49 | static void genl_lock_all(void) |
50 | { | |
51 | down_write(&cb_lock); | |
52 | genl_lock(); | |
53 | } | |
54 | ||
55 | static void genl_unlock_all(void) | |
56 | { | |
57 | genl_unlock(); | |
58 | up_write(&cb_lock); | |
59 | } | |
60 | ||
482a8524 TG |
61 | #define GENL_FAM_TAB_SIZE 16 |
62 | #define GENL_FAM_TAB_MASK (GENL_FAM_TAB_SIZE - 1) | |
63 | ||
64 | static struct list_head family_ht[GENL_FAM_TAB_SIZE]; | |
2dbba6f7 JB |
65 | /* |
66 | * Bitmap of multicast groups that are currently in use. | |
67 | * | |
68 | * To avoid an allocation at boot of just one unsigned long, | |
69 | * declare it global instead. | |
70 | * Bit 0 is marked as already used since group 0 is invalid. | |
e5dcecba JB |
71 | * Bit 1 is marked as already used since the drop-monitor code |
72 | * abuses the API and thinks it can statically use group 1. | |
73 | * That group will typically conflict with other groups that | |
74 | * any proper users use. | |
2a94fe48 JB |
75 | * Bit 16 is marked as used since it's used for generic netlink |
76 | * and the code no longer marks pre-reserved IDs as used. | |
2ecf7536 JB |
77 | * Bit 17 is marked as already used since the VFS quota code |
78 | * also abused this API and relied on family == group ID, we | |
79 | * cater to that by giving it a static family and group ID. | |
5e53e689 JB |
80 | * Bit 18 is marked as already used since the PMCRAID driver |
81 | * did the same thing as the VFS quota code (maybe copied?) | |
2dbba6f7 | 82 | */ |
2a94fe48 | 83 | static unsigned long mc_group_start = 0x3 | BIT(GENL_ID_CTRL) | |
5e53e689 JB |
84 | BIT(GENL_ID_VFS_DQUOT) | |
85 | BIT(GENL_ID_PMCRAID); | |
2dbba6f7 JB |
86 | static unsigned long *mc_groups = &mc_group_start; |
87 | static unsigned long mc_groups_longs = 1; | |
482a8524 | 88 | |
c2ebb908 | 89 | static int genl_ctrl_event(int event, struct genl_family *family, |
2a94fe48 JB |
90 | const struct genl_multicast_group *grp, |
91 | int grp_id); | |
482a8524 TG |
92 | |
93 | static inline unsigned int genl_family_hash(unsigned int id) | |
94 | { | |
95 | return id & GENL_FAM_TAB_MASK; | |
96 | } | |
97 | ||
98 | static inline struct list_head *genl_family_chain(unsigned int id) | |
99 | { | |
100 | return &family_ht[genl_family_hash(id)]; | |
101 | } | |
102 | ||
103 | static struct genl_family *genl_family_find_byid(unsigned int id) | |
104 | { | |
105 | struct genl_family *f; | |
106 | ||
107 | list_for_each_entry(f, genl_family_chain(id), family_list) | |
108 | if (f->id == id) | |
109 | return f; | |
110 | ||
111 | return NULL; | |
112 | } | |
113 | ||
114 | static struct genl_family *genl_family_find_byname(char *name) | |
115 | { | |
116 | struct genl_family *f; | |
117 | int i; | |
118 | ||
119 | for (i = 0; i < GENL_FAM_TAB_SIZE; i++) | |
120 | list_for_each_entry(f, genl_family_chain(i), family_list) | |
121 | if (strcmp(f->name, name) == 0) | |
122 | return f; | |
123 | ||
124 | return NULL; | |
125 | } | |
126 | ||
f84f771d | 127 | static const struct genl_ops *genl_get_cmd(u8 cmd, struct genl_family *family) |
482a8524 | 128 | { |
d91824c0 | 129 | int i; |
482a8524 | 130 | |
d91824c0 JB |
131 | for (i = 0; i < family->n_ops; i++) |
132 | if (family->ops[i].cmd == cmd) | |
133 | return &family->ops[i]; | |
482a8524 TG |
134 | |
135 | return NULL; | |
136 | } | |
137 | ||
138 | /* Of course we are going to have problems once we hit | |
139 | * 2^16 alive types, but that can only happen by year 2K | |
140 | */ | |
b57ef81f | 141 | static u16 genl_generate_id(void) |
482a8524 | 142 | { |
988ade6b KK |
143 | static u16 id_gen_idx = GENL_MIN_ID; |
144 | int i; | |
482a8524 | 145 | |
988ade6b | 146 | for (i = 0; i <= GENL_MAX_ID - GENL_MIN_ID; i++) { |
2ecf7536 | 147 | if (id_gen_idx != GENL_ID_VFS_DQUOT && |
5e53e689 | 148 | id_gen_idx != GENL_ID_PMCRAID && |
2ecf7536 | 149 | !genl_family_find_byid(id_gen_idx)) |
988ade6b KK |
150 | return id_gen_idx; |
151 | if (++id_gen_idx > GENL_MAX_ID) | |
482a8524 | 152 | id_gen_idx = GENL_MIN_ID; |
988ade6b | 153 | } |
482a8524 | 154 | |
988ade6b | 155 | return 0; |
482a8524 TG |
156 | } |
157 | ||
2a94fe48 | 158 | static int genl_allocate_reserve_groups(int n_groups, int *first_id) |
2dbba6f7 | 159 | { |
2dbba6f7 | 160 | unsigned long *new_groups; |
2a94fe48 JB |
161 | int start = 0; |
162 | int i; | |
163 | int id; | |
164 | bool fits; | |
165 | ||
166 | do { | |
167 | if (start == 0) | |
168 | id = find_first_zero_bit(mc_groups, | |
169 | mc_groups_longs * | |
170 | BITS_PER_LONG); | |
171 | else | |
172 | id = find_next_zero_bit(mc_groups, | |
173 | mc_groups_longs * BITS_PER_LONG, | |
174 | start); | |
175 | ||
176 | fits = true; | |
177 | for (i = id; | |
178 | i < min_t(int, id + n_groups, | |
179 | mc_groups_longs * BITS_PER_LONG); | |
180 | i++) { | |
181 | if (test_bit(i, mc_groups)) { | |
182 | start = i; | |
183 | fits = false; | |
184 | break; | |
185 | } | |
186 | } | |
2dbba6f7 | 187 | |
b8e429a2 | 188 | if (id + n_groups > mc_groups_longs * BITS_PER_LONG) { |
2a94fe48 JB |
189 | unsigned long new_longs = mc_groups_longs + |
190 | BITS_TO_LONGS(n_groups); | |
191 | size_t nlen = new_longs * sizeof(unsigned long); | |
192 | ||
193 | if (mc_groups == &mc_group_start) { | |
194 | new_groups = kzalloc(nlen, GFP_KERNEL); | |
195 | if (!new_groups) | |
196 | return -ENOMEM; | |
197 | mc_groups = new_groups; | |
198 | *mc_groups = mc_group_start; | |
199 | } else { | |
200 | new_groups = krealloc(mc_groups, nlen, | |
201 | GFP_KERNEL); | |
202 | if (!new_groups) | |
203 | return -ENOMEM; | |
204 | mc_groups = new_groups; | |
205 | for (i = 0; i < BITS_TO_LONGS(n_groups); i++) | |
206 | mc_groups[mc_groups_longs + i] = 0; | |
207 | } | |
208 | mc_groups_longs = new_longs; | |
209 | } | |
210 | } while (!fits); | |
2dbba6f7 | 211 | |
2a94fe48 JB |
212 | for (i = id; i < id + n_groups; i++) |
213 | set_bit(i, mc_groups); | |
214 | *first_id = id; | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static struct genl_family genl_ctrl; | |
219 | ||
220 | static int genl_validate_assign_mc_groups(struct genl_family *family) | |
221 | { | |
222 | int first_id; | |
223 | int n_groups = family->n_mcgrps; | |
0f0e2159 | 224 | int err = 0, i; |
2a94fe48 JB |
225 | bool groups_allocated = false; |
226 | ||
227 | if (!n_groups) | |
228 | return 0; | |
229 | ||
230 | for (i = 0; i < n_groups; i++) { | |
231 | const struct genl_multicast_group *grp = &family->mcgrps[i]; | |
232 | ||
233 | if (WARN_ON(grp->name[0] == '\0')) | |
234 | return -EINVAL; | |
235 | if (WARN_ON(memchr(grp->name, '\0', GENL_NAMSIZ) == NULL)) | |
236 | return -EINVAL; | |
237 | } | |
2dbba6f7 | 238 | |
e5dcecba | 239 | /* special-case our own group and hacks */ |
2a94fe48 JB |
240 | if (family == &genl_ctrl) { |
241 | first_id = GENL_ID_CTRL; | |
242 | BUG_ON(n_groups != 1); | |
243 | } else if (strcmp(family->name, "NET_DM") == 0) { | |
244 | first_id = 1; | |
245 | BUG_ON(n_groups != 1); | |
5e53e689 | 246 | } else if (family->id == GENL_ID_VFS_DQUOT) { |
2a94fe48 JB |
247 | first_id = GENL_ID_VFS_DQUOT; |
248 | BUG_ON(n_groups != 1); | |
5e53e689 JB |
249 | } else if (family->id == GENL_ID_PMCRAID) { |
250 | first_id = GENL_ID_PMCRAID; | |
251 | BUG_ON(n_groups != 1); | |
2a94fe48 JB |
252 | } else { |
253 | groups_allocated = true; | |
254 | err = genl_allocate_reserve_groups(n_groups, &first_id); | |
255 | if (err) | |
256 | return err; | |
2dbba6f7 JB |
257 | } |
258 | ||
2a94fe48 JB |
259 | family->mcgrp_offset = first_id; |
260 | ||
261 | /* if still initializing, can't and don't need to to realloc bitmaps */ | |
262 | if (!init_net.genl_sock) | |
263 | return 0; | |
264 | ||
134e6375 JB |
265 | if (family->netnsok) { |
266 | struct net *net; | |
267 | ||
d136f1bd | 268 | netlink_table_grab(); |
134e6375 JB |
269 | rcu_read_lock(); |
270 | for_each_net_rcu(net) { | |
d136f1bd | 271 | err = __netlink_change_ngroups(net->genl_sock, |
134e6375 JB |
272 | mc_groups_longs * BITS_PER_LONG); |
273 | if (err) { | |
274 | /* | |
275 | * No need to roll back, can only fail if | |
276 | * memory allocation fails and then the | |
277 | * number of _possible_ groups has been | |
278 | * increased on some sockets which is ok. | |
279 | */ | |
2a94fe48 | 280 | break; |
134e6375 JB |
281 | } |
282 | } | |
283 | rcu_read_unlock(); | |
d136f1bd | 284 | netlink_table_ungrab(); |
134e6375 JB |
285 | } else { |
286 | err = netlink_change_ngroups(init_net.genl_sock, | |
287 | mc_groups_longs * BITS_PER_LONG); | |
134e6375 | 288 | } |
2dbba6f7 | 289 | |
2a94fe48 JB |
290 | if (groups_allocated && err) { |
291 | for (i = 0; i < family->n_mcgrps; i++) | |
292 | clear_bit(family->mcgrp_offset + i, mc_groups); | |
293 | } | |
2dbba6f7 | 294 | |
79d310d0 | 295 | return err; |
2dbba6f7 | 296 | } |
2dbba6f7 | 297 | |
2a94fe48 | 298 | static void genl_unregister_mc_groups(struct genl_family *family) |
79dc4386 | 299 | { |
134e6375 | 300 | struct net *net; |
2a94fe48 | 301 | int i; |
134e6375 | 302 | |
b8273570 | 303 | netlink_table_grab(); |
134e6375 | 304 | rcu_read_lock(); |
2a94fe48 JB |
305 | for_each_net_rcu(net) { |
306 | for (i = 0; i < family->n_mcgrps; i++) | |
307 | __netlink_clear_multicast_users( | |
308 | net->genl_sock, family->mcgrp_offset + i); | |
309 | } | |
134e6375 | 310 | rcu_read_unlock(); |
b8273570 | 311 | netlink_table_ungrab(); |
134e6375 | 312 | |
2a94fe48 JB |
313 | for (i = 0; i < family->n_mcgrps; i++) { |
314 | int grp_id = family->mcgrp_offset + i; | |
2dbba6f7 | 315 | |
2a94fe48 JB |
316 | if (grp_id != 1) |
317 | clear_bit(grp_id, mc_groups); | |
318 | genl_ctrl_event(CTRL_CMD_DELMCAST_GRP, family, | |
319 | &family->mcgrps[i], grp_id); | |
320 | } | |
2dbba6f7 JB |
321 | } |
322 | ||
2f91abd4 | 323 | static int genl_validate_ops(const struct genl_family *family) |
482a8524 | 324 | { |
568508aa JB |
325 | const struct genl_ops *ops = family->ops; |
326 | unsigned int n_ops = family->n_ops; | |
d91824c0 JB |
327 | int i, j; |
328 | ||
568508aa JB |
329 | if (WARN_ON(n_ops && !ops)) |
330 | return -EINVAL; | |
331 | ||
332 | if (!n_ops) | |
333 | return 0; | |
334 | ||
d91824c0 JB |
335 | for (i = 0; i < n_ops; i++) { |
336 | if (ops[i].dumpit == NULL && ops[i].doit == NULL) | |
337 | return -EINVAL; | |
338 | for (j = i + 1; j < n_ops; j++) | |
339 | if (ops[i].cmd == ops[j].cmd) | |
340 | return -EINVAL; | |
482a8524 TG |
341 | } |
342 | ||
d91824c0 | 343 | return 0; |
482a8524 | 344 | } |
482a8524 TG |
345 | |
346 | /** | |
33c6b1f6 | 347 | * __genl_register_family - register a generic netlink family |
482a8524 TG |
348 | * @family: generic netlink family |
349 | * | |
350 | * Registers the specified family after validating it first. Only one | |
351 | * family may be registered with the same family name or identifier. | |
352 | * The family id may equal GENL_ID_GENERATE causing an unique id to | |
353 | * be automatically generated and assigned. | |
354 | * | |
568508aa JB |
355 | * The family's ops array must already be assigned, you can use the |
356 | * genl_register_family_with_ops() helper function. | |
357 | * | |
482a8524 TG |
358 | * Return 0 on success or a negative error code. |
359 | */ | |
33c6b1f6 | 360 | int __genl_register_family(struct genl_family *family) |
482a8524 | 361 | { |
2a94fe48 | 362 | int err = -EINVAL, i; |
482a8524 TG |
363 | |
364 | if (family->id && family->id < GENL_MIN_ID) | |
365 | goto errout; | |
366 | ||
367 | if (family->id > GENL_MAX_ID) | |
368 | goto errout; | |
369 | ||
568508aa JB |
370 | err = genl_validate_ops(family); |
371 | if (err) | |
372 | return err; | |
373 | ||
def31174 | 374 | genl_lock_all(); |
482a8524 TG |
375 | |
376 | if (genl_family_find_byname(family->name)) { | |
377 | err = -EEXIST; | |
378 | goto errout_locked; | |
379 | } | |
380 | ||
482a8524 TG |
381 | if (family->id == GENL_ID_GENERATE) { |
382 | u16 newid = genl_generate_id(); | |
383 | ||
384 | if (!newid) { | |
385 | err = -ENOMEM; | |
386 | goto errout_locked; | |
387 | } | |
388 | ||
389 | family->id = newid; | |
93860b08 KK |
390 | } else if (genl_family_find_byid(family->id)) { |
391 | err = -EEXIST; | |
392 | goto errout_locked; | |
482a8524 TG |
393 | } |
394 | ||
def31174 | 395 | if (family->maxattr && !family->parallel_ops) { |
482a8524 TG |
396 | family->attrbuf = kmalloc((family->maxattr+1) * |
397 | sizeof(struct nlattr *), GFP_KERNEL); | |
398 | if (family->attrbuf == NULL) { | |
399 | err = -ENOMEM; | |
e200bd80 | 400 | goto errout_locked; |
482a8524 TG |
401 | } |
402 | } else | |
403 | family->attrbuf = NULL; | |
404 | ||
2a94fe48 JB |
405 | err = genl_validate_assign_mc_groups(family); |
406 | if (err) | |
407 | goto errout_locked; | |
408 | ||
482a8524 | 409 | list_add_tail(&family->family_list, genl_family_chain(family->id)); |
def31174 | 410 | genl_unlock_all(); |
482a8524 | 411 | |
2a94fe48 JB |
412 | /* send all events */ |
413 | genl_ctrl_event(CTRL_CMD_NEWFAMILY, family, NULL, 0); | |
414 | for (i = 0; i < family->n_mcgrps; i++) | |
415 | genl_ctrl_event(CTRL_CMD_NEWMCAST_GRP, family, | |
416 | &family->mcgrps[i], family->mcgrp_offset + i); | |
482a8524 TG |
417 | |
418 | return 0; | |
419 | ||
420 | errout_locked: | |
def31174 | 421 | genl_unlock_all(); |
482a8524 TG |
422 | errout: |
423 | return err; | |
424 | } | |
33c6b1f6 | 425 | EXPORT_SYMBOL(__genl_register_family); |
482a8524 TG |
426 | |
427 | /** | |
428 | * genl_unregister_family - unregister generic netlink family | |
429 | * @family: generic netlink family | |
430 | * | |
431 | * Unregisters the specified family. | |
432 | * | |
433 | * Returns 0 on success or a negative error code. | |
434 | */ | |
435 | int genl_unregister_family(struct genl_family *family) | |
436 | { | |
437 | struct genl_family *rc; | |
438 | ||
def31174 | 439 | genl_lock_all(); |
482a8524 TG |
440 | |
441 | list_for_each_entry(rc, genl_family_chain(family->id), family_list) { | |
442 | if (family->id != rc->id || strcmp(rc->name, family->name)) | |
443 | continue; | |
444 | ||
ee1c2442 JB |
445 | genl_unregister_mc_groups(family); |
446 | ||
482a8524 | 447 | list_del(&rc->family_list); |
d91824c0 | 448 | family->n_ops = 0; |
ee1c2442 JB |
449 | up_write(&cb_lock); |
450 | wait_event(genl_sk_destructing_waitq, | |
451 | atomic_read(&genl_sk_destructing_cnt) == 0); | |
452 | genl_unlock(); | |
482a8524 | 453 | |
482a8524 | 454 | kfree(family->attrbuf); |
2a94fe48 | 455 | genl_ctrl_event(CTRL_CMD_DELFAMILY, family, NULL, 0); |
482a8524 TG |
456 | return 0; |
457 | } | |
458 | ||
def31174 | 459 | genl_unlock_all(); |
482a8524 TG |
460 | |
461 | return -ENOENT; | |
462 | } | |
416c2f9c | 463 | EXPORT_SYMBOL(genl_unregister_family); |
482a8524 | 464 | |
bb9b18fb TG |
465 | /** |
466 | * genlmsg_new_unicast - Allocate generic netlink message for unicast | |
467 | * @payload: size of the message payload | |
468 | * @info: information on destination | |
469 | * @flags: the type of memory to allocate | |
470 | * | |
471 | * Allocates a new sk_buff large enough to cover the specified payload | |
472 | * plus required Netlink headers. Will check receiving socket for | |
473 | * memory mapped i/o capability and use it if enabled. Will fall back | |
474 | * to non-mapped skb if message size exceeds the frame size of the ring. | |
475 | */ | |
476 | struct sk_buff *genlmsg_new_unicast(size_t payload, struct genl_info *info, | |
477 | gfp_t flags) | |
478 | { | |
479 | size_t len = nlmsg_total_size(genlmsg_total_size(payload)); | |
480 | ||
481 | return netlink_alloc_skb(info->dst_sk, len, info->snd_portid, flags); | |
482 | } | |
483 | EXPORT_SYMBOL_GPL(genlmsg_new_unicast); | |
484 | ||
a46621a3 DV |
485 | /** |
486 | * genlmsg_put - Add generic netlink header to netlink message | |
487 | * @skb: socket buffer holding the message | |
15e47304 | 488 | * @portid: netlink portid the message is addressed to |
a46621a3 DV |
489 | * @seq: sequence number (usually the one of the sender) |
490 | * @family: generic netlink family | |
2c53040f | 491 | * @flags: netlink message flags |
a46621a3 DV |
492 | * @cmd: generic netlink command |
493 | * | |
494 | * Returns pointer to user specific header | |
495 | */ | |
15e47304 | 496 | void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, |
a46621a3 DV |
497 | struct genl_family *family, int flags, u8 cmd) |
498 | { | |
499 | struct nlmsghdr *nlh; | |
500 | struct genlmsghdr *hdr; | |
501 | ||
15e47304 | 502 | nlh = nlmsg_put(skb, portid, seq, family->id, GENL_HDRLEN + |
a46621a3 DV |
503 | family->hdrsize, flags); |
504 | if (nlh == NULL) | |
505 | return NULL; | |
506 | ||
507 | hdr = nlmsg_data(nlh); | |
508 | hdr->cmd = cmd; | |
509 | hdr->version = family->version; | |
510 | hdr->reserved = 0; | |
511 | ||
512 | return (char *) hdr + GENL_HDRLEN; | |
513 | } | |
514 | EXPORT_SYMBOL(genlmsg_put); | |
515 | ||
fc9e50f5 TH |
516 | static int genl_lock_start(struct netlink_callback *cb) |
517 | { | |
518 | /* our ops are always const - netlink API doesn't propagate that */ | |
519 | const struct genl_ops *ops = cb->data; | |
520 | int rc = 0; | |
521 | ||
522 | if (ops->start) { | |
523 | genl_lock(); | |
524 | rc = ops->start(cb); | |
525 | genl_unlock(); | |
526 | } | |
527 | return rc; | |
528 | } | |
529 | ||
9b96309c PS |
530 | static int genl_lock_dumpit(struct sk_buff *skb, struct netlink_callback *cb) |
531 | { | |
f84f771d JB |
532 | /* our ops are always const - netlink API doesn't propagate that */ |
533 | const struct genl_ops *ops = cb->data; | |
9b96309c PS |
534 | int rc; |
535 | ||
536 | genl_lock(); | |
537 | rc = ops->dumpit(skb, cb); | |
538 | genl_unlock(); | |
539 | return rc; | |
540 | } | |
541 | ||
542 | static int genl_lock_done(struct netlink_callback *cb) | |
543 | { | |
f84f771d JB |
544 | /* our ops are always const - netlink API doesn't propagate that */ |
545 | const struct genl_ops *ops = cb->data; | |
9b96309c PS |
546 | int rc = 0; |
547 | ||
548 | if (ops->done) { | |
549 | genl_lock(); | |
550 | rc = ops->done(cb); | |
551 | genl_unlock(); | |
552 | } | |
553 | return rc; | |
554 | } | |
555 | ||
def31174 PS |
556 | static int genl_family_rcv_msg(struct genl_family *family, |
557 | struct sk_buff *skb, | |
558 | struct nlmsghdr *nlh) | |
482a8524 | 559 | { |
f84f771d | 560 | const struct genl_ops *ops; |
134e6375 | 561 | struct net *net = sock_net(skb->sk); |
482a8524 TG |
562 | struct genl_info info; |
563 | struct genlmsghdr *hdr = nlmsg_data(nlh); | |
def31174 | 564 | struct nlattr **attrbuf; |
1d00a4eb | 565 | int hdrlen, err; |
482a8524 | 566 | |
134e6375 JB |
567 | /* this family doesn't exist in this netns */ |
568 | if (!family->netnsok && !net_eq(net, &init_net)) | |
569 | return -ENOENT; | |
570 | ||
482a8524 TG |
571 | hdrlen = GENL_HDRLEN + family->hdrsize; |
572 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) | |
1d00a4eb | 573 | return -EINVAL; |
482a8524 TG |
574 | |
575 | ops = genl_get_cmd(hdr->cmd, family); | |
1d00a4eb TG |
576 | if (ops == NULL) |
577 | return -EOPNOTSUPP; | |
482a8524 | 578 | |
1d00a4eb | 579 | if ((ops->flags & GENL_ADMIN_PERM) && |
90f62cf3 | 580 | !netlink_capable(skb, CAP_NET_ADMIN)) |
1d00a4eb | 581 | return -EPERM; |
482a8524 | 582 | |
e1ee3673 | 583 | if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) { |
9b96309c | 584 | int rc; |
def31174 | 585 | |
1d00a4eb TG |
586 | if (ops->dumpit == NULL) |
587 | return -EOPNOTSUPP; | |
482a8524 | 588 | |
9b96309c PS |
589 | if (!family->parallel_ops) { |
590 | struct netlink_dump_control c = { | |
33c6b1f6 | 591 | .module = family->module, |
f84f771d JB |
592 | /* we have const, but the netlink API doesn't */ |
593 | .data = (void *)ops, | |
fc9e50f5 | 594 | .start = genl_lock_start, |
9b96309c PS |
595 | .dump = genl_lock_dumpit, |
596 | .done = genl_lock_done, | |
597 | }; | |
598 | ||
599 | genl_unlock(); | |
33c6b1f6 | 600 | rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c); |
9b96309c PS |
601 | genl_lock(); |
602 | ||
603 | } else { | |
604 | struct netlink_dump_control c = { | |
33c6b1f6 | 605 | .module = family->module, |
fc9e50f5 | 606 | .start = ops->start, |
9b96309c PS |
607 | .dump = ops->dumpit, |
608 | .done = ops->done, | |
609 | }; | |
610 | ||
33c6b1f6 | 611 | rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c); |
9b96309c PS |
612 | } |
613 | ||
614 | return rc; | |
482a8524 TG |
615 | } |
616 | ||
1d00a4eb TG |
617 | if (ops->doit == NULL) |
618 | return -EOPNOTSUPP; | |
482a8524 | 619 | |
def31174 PS |
620 | if (family->maxattr && family->parallel_ops) { |
621 | attrbuf = kmalloc((family->maxattr+1) * | |
622 | sizeof(struct nlattr *), GFP_KERNEL); | |
623 | if (attrbuf == NULL) | |
624 | return -ENOMEM; | |
625 | } else | |
626 | attrbuf = family->attrbuf; | |
627 | ||
628 | if (attrbuf) { | |
629 | err = nlmsg_parse(nlh, hdrlen, attrbuf, family->maxattr, | |
482a8524 TG |
630 | ops->policy); |
631 | if (err < 0) | |
50754d21 | 632 | goto out; |
482a8524 TG |
633 | } |
634 | ||
635 | info.snd_seq = nlh->nlmsg_seq; | |
15e47304 | 636 | info.snd_portid = NETLINK_CB(skb).portid; |
482a8524 TG |
637 | info.nlhdr = nlh; |
638 | info.genlhdr = nlmsg_data(nlh); | |
639 | info.userhdr = nlmsg_data(nlh) + GENL_HDRLEN; | |
def31174 | 640 | info.attrs = attrbuf; |
bb9b18fb | 641 | info.dst_sk = skb->sk; |
134e6375 | 642 | genl_info_net_set(&info, net); |
ff4c92d8 | 643 | memset(&info.user_ptr, 0, sizeof(info.user_ptr)); |
482a8524 | 644 | |
ff4c92d8 JB |
645 | if (family->pre_doit) { |
646 | err = family->pre_doit(ops, skb, &info); | |
647 | if (err) | |
50754d21 | 648 | goto out; |
ff4c92d8 JB |
649 | } |
650 | ||
651 | err = ops->doit(skb, &info); | |
652 | ||
653 | if (family->post_doit) | |
654 | family->post_doit(ops, skb, &info); | |
655 | ||
50754d21 | 656 | out: |
def31174 PS |
657 | if (family->parallel_ops) |
658 | kfree(attrbuf); | |
659 | ||
660 | return err; | |
661 | } | |
662 | ||
663 | static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
664 | { | |
665 | struct genl_family *family; | |
666 | int err; | |
667 | ||
668 | family = genl_family_find_byid(nlh->nlmsg_type); | |
669 | if (family == NULL) | |
670 | return -ENOENT; | |
671 | ||
672 | if (!family->parallel_ops) | |
673 | genl_lock(); | |
674 | ||
675 | err = genl_family_rcv_msg(family, skb, nlh); | |
676 | ||
677 | if (!family->parallel_ops) | |
678 | genl_unlock(); | |
679 | ||
ff4c92d8 | 680 | return err; |
482a8524 TG |
681 | } |
682 | ||
cd40b7d3 | 683 | static void genl_rcv(struct sk_buff *skb) |
482a8524 | 684 | { |
def31174 | 685 | down_read(&cb_lock); |
cd40b7d3 | 686 | netlink_rcv_skb(skb, &genl_rcv_msg); |
def31174 | 687 | up_read(&cb_lock); |
482a8524 TG |
688 | } |
689 | ||
690 | /************************************************************************** | |
691 | * Controller | |
692 | **************************************************************************/ | |
693 | ||
17c157c8 TG |
694 | static struct genl_family genl_ctrl = { |
695 | .id = GENL_ID_CTRL, | |
696 | .name = "nlctrl", | |
334c29a6 | 697 | .version = 0x2, |
17c157c8 | 698 | .maxattr = CTRL_ATTR_MAX, |
134e6375 | 699 | .netnsok = true, |
17c157c8 TG |
700 | }; |
701 | ||
15e47304 | 702 | static int ctrl_fill_info(struct genl_family *family, u32 portid, u32 seq, |
482a8524 TG |
703 | u32 flags, struct sk_buff *skb, u8 cmd) |
704 | { | |
705 | void *hdr; | |
706 | ||
15e47304 | 707 | hdr = genlmsg_put(skb, portid, seq, &genl_ctrl, flags, cmd); |
482a8524 TG |
708 | if (hdr == NULL) |
709 | return -1; | |
710 | ||
444653f6 DM |
711 | if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) || |
712 | nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id) || | |
713 | nla_put_u32(skb, CTRL_ATTR_VERSION, family->version) || | |
714 | nla_put_u32(skb, CTRL_ATTR_HDRSIZE, family->hdrsize) || | |
715 | nla_put_u32(skb, CTRL_ATTR_MAXATTR, family->maxattr)) | |
716 | goto nla_put_failure; | |
eb328111 | 717 | |
d91824c0 | 718 | if (family->n_ops) { |
e94ef682 | 719 | struct nlattr *nla_ops; |
d91824c0 | 720 | int i; |
eb328111 | 721 | |
e94ef682 TG |
722 | nla_ops = nla_nest_start(skb, CTRL_ATTR_OPS); |
723 | if (nla_ops == NULL) | |
eb328111 TG |
724 | goto nla_put_failure; |
725 | ||
d91824c0 | 726 | for (i = 0; i < family->n_ops; i++) { |
e94ef682 | 727 | struct nlattr *nest; |
f84f771d | 728 | const struct genl_ops *ops = &family->ops[i]; |
029b234f | 729 | u32 op_flags = ops->flags; |
f84f771d JB |
730 | |
731 | if (ops->dumpit) | |
029b234f | 732 | op_flags |= GENL_CMD_CAP_DUMP; |
f84f771d | 733 | if (ops->doit) |
029b234f | 734 | op_flags |= GENL_CMD_CAP_DO; |
f84f771d | 735 | if (ops->policy) |
029b234f | 736 | op_flags |= GENL_CMD_CAP_HASPOL; |
eb328111 | 737 | |
d91824c0 | 738 | nest = nla_nest_start(skb, i + 1); |
e94ef682 TG |
739 | if (nest == NULL) |
740 | goto nla_put_failure; | |
eb328111 | 741 | |
444653f6 | 742 | if (nla_put_u32(skb, CTRL_ATTR_OP_ID, ops->cmd) || |
029b234f | 743 | nla_put_u32(skb, CTRL_ATTR_OP_FLAGS, op_flags)) |
444653f6 | 744 | goto nla_put_failure; |
eb328111 | 745 | |
e94ef682 TG |
746 | nla_nest_end(skb, nest); |
747 | } | |
748 | ||
749 | nla_nest_end(skb, nla_ops); | |
750 | } | |
482a8524 | 751 | |
2a94fe48 | 752 | if (family->n_mcgrps) { |
2dbba6f7 | 753 | struct nlattr *nla_grps; |
2a94fe48 | 754 | int i; |
2dbba6f7 JB |
755 | |
756 | nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS); | |
757 | if (nla_grps == NULL) | |
758 | goto nla_put_failure; | |
759 | ||
2a94fe48 | 760 | for (i = 0; i < family->n_mcgrps; i++) { |
2dbba6f7 | 761 | struct nlattr *nest; |
2a94fe48 | 762 | const struct genl_multicast_group *grp; |
2dbba6f7 | 763 | |
2a94fe48 JB |
764 | grp = &family->mcgrps[i]; |
765 | ||
766 | nest = nla_nest_start(skb, i + 1); | |
2dbba6f7 JB |
767 | if (nest == NULL) |
768 | goto nla_put_failure; | |
769 | ||
2a94fe48 JB |
770 | if (nla_put_u32(skb, CTRL_ATTR_MCAST_GRP_ID, |
771 | family->mcgrp_offset + i) || | |
444653f6 DM |
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 | ||
053c095a JB |
781 | genlmsg_end(skb, hdr); |
782 | return 0; | |
2dbba6f7 JB |
783 | |
784 | nla_put_failure: | |
bc3ed28c TG |
785 | genlmsg_cancel(skb, hdr); |
786 | return -EMSGSIZE; | |
2dbba6f7 JB |
787 | } |
788 | ||
c2ebb908 | 789 | static int ctrl_fill_mcgrp_info(struct genl_family *family, |
2a94fe48 JB |
790 | const struct genl_multicast_group *grp, |
791 | int grp_id, u32 portid, u32 seq, u32 flags, | |
792 | struct sk_buff *skb, u8 cmd) | |
2dbba6f7 JB |
793 | { |
794 | void *hdr; | |
795 | struct nlattr *nla_grps; | |
796 | struct nlattr *nest; | |
797 | ||
15e47304 | 798 | hdr = genlmsg_put(skb, portid, seq, &genl_ctrl, flags, cmd); |
2dbba6f7 JB |
799 | if (hdr == NULL) |
800 | return -1; | |
801 | ||
c2ebb908 JB |
802 | if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) || |
803 | nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id)) | |
444653f6 | 804 | goto nla_put_failure; |
2dbba6f7 JB |
805 | |
806 | nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS); | |
807 | if (nla_grps == NULL) | |
808 | goto nla_put_failure; | |
809 | ||
810 | nest = nla_nest_start(skb, 1); | |
811 | if (nest == NULL) | |
812 | goto nla_put_failure; | |
813 | ||
2a94fe48 | 814 | if (nla_put_u32(skb, CTRL_ATTR_MCAST_GRP_ID, grp_id) || |
444653f6 DM |
815 | nla_put_string(skb, CTRL_ATTR_MCAST_GRP_NAME, |
816 | grp->name)) | |
817 | goto nla_put_failure; | |
2dbba6f7 JB |
818 | |
819 | nla_nest_end(skb, nest); | |
820 | nla_nest_end(skb, nla_grps); | |
821 | ||
053c095a JB |
822 | genlmsg_end(skb, hdr); |
823 | return 0; | |
482a8524 TG |
824 | |
825 | nla_put_failure: | |
bc3ed28c TG |
826 | genlmsg_cancel(skb, hdr); |
827 | return -EMSGSIZE; | |
482a8524 TG |
828 | } |
829 | ||
830 | static int ctrl_dumpfamily(struct sk_buff *skb, struct netlink_callback *cb) | |
831 | { | |
832 | ||
833 | int i, n = 0; | |
834 | struct genl_family *rt; | |
134e6375 | 835 | struct net *net = sock_net(skb->sk); |
482a8524 TG |
836 | int chains_to_skip = cb->args[0]; |
837 | int fams_to_skip = cb->args[1]; | |
838 | ||
e1d5a010 | 839 | for (i = chains_to_skip; i < GENL_FAM_TAB_SIZE; i++) { |
482a8524 TG |
840 | n = 0; |
841 | list_for_each_entry(rt, genl_family_chain(i), family_list) { | |
134e6375 JB |
842 | if (!rt->netnsok && !net_eq(net, &init_net)) |
843 | continue; | |
482a8524 TG |
844 | if (++n < fams_to_skip) |
845 | continue; | |
15e47304 | 846 | if (ctrl_fill_info(rt, NETLINK_CB(cb->skb).portid, |
482a8524 TG |
847 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
848 | skb, CTRL_CMD_NEWFAMILY) < 0) | |
849 | goto errout; | |
850 | } | |
851 | ||
852 | fams_to_skip = 0; | |
853 | } | |
854 | ||
855 | errout: | |
856 | cb->args[0] = i; | |
857 | cb->args[1] = n; | |
858 | ||
859 | return skb->len; | |
860 | } | |
861 | ||
2dbba6f7 | 862 | static struct sk_buff *ctrl_build_family_msg(struct genl_family *family, |
15e47304 | 863 | u32 portid, int seq, u8 cmd) |
482a8524 TG |
864 | { |
865 | struct sk_buff *skb; | |
866 | int err; | |
867 | ||
339bf98f | 868 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
482a8524 TG |
869 | if (skb == NULL) |
870 | return ERR_PTR(-ENOBUFS); | |
871 | ||
15e47304 | 872 | err = ctrl_fill_info(family, portid, seq, 0, skb, cmd); |
482a8524 TG |
873 | if (err < 0) { |
874 | nlmsg_free(skb); | |
875 | return ERR_PTR(err); | |
876 | } | |
877 | ||
878 | return skb; | |
879 | } | |
880 | ||
2a94fe48 JB |
881 | static struct sk_buff * |
882 | ctrl_build_mcgrp_msg(struct genl_family *family, | |
883 | const struct genl_multicast_group *grp, | |
884 | int grp_id, u32 portid, int seq, u8 cmd) | |
2dbba6f7 JB |
885 | { |
886 | struct sk_buff *skb; | |
887 | int err; | |
888 | ||
889 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
890 | if (skb == NULL) | |
891 | return ERR_PTR(-ENOBUFS); | |
892 | ||
2a94fe48 JB |
893 | err = ctrl_fill_mcgrp_info(family, grp, grp_id, portid, |
894 | seq, 0, skb, cmd); | |
2dbba6f7 JB |
895 | if (err < 0) { |
896 | nlmsg_free(skb); | |
897 | return ERR_PTR(err); | |
898 | } | |
899 | ||
900 | return skb; | |
901 | } | |
902 | ||
ef7c79ed | 903 | static const struct nla_policy ctrl_policy[CTRL_ATTR_MAX+1] = { |
482a8524 | 904 | [CTRL_ATTR_FAMILY_ID] = { .type = NLA_U16 }, |
5176f91e TG |
905 | [CTRL_ATTR_FAMILY_NAME] = { .type = NLA_NUL_STRING, |
906 | .len = GENL_NAMSIZ - 1 }, | |
482a8524 TG |
907 | }; |
908 | ||
909 | static int ctrl_getfamily(struct sk_buff *skb, struct genl_info *info) | |
910 | { | |
911 | struct sk_buff *msg; | |
912 | struct genl_family *res = NULL; | |
913 | int err = -EINVAL; | |
914 | ||
915 | if (info->attrs[CTRL_ATTR_FAMILY_ID]) { | |
916 | u16 id = nla_get_u16(info->attrs[CTRL_ATTR_FAMILY_ID]); | |
917 | res = genl_family_find_byid(id); | |
134e6375 | 918 | err = -ENOENT; |
482a8524 TG |
919 | } |
920 | ||
921 | if (info->attrs[CTRL_ATTR_FAMILY_NAME]) { | |
5176f91e | 922 | char *name; |
482a8524 | 923 | |
5176f91e | 924 | name = nla_data(info->attrs[CTRL_ATTR_FAMILY_NAME]); |
482a8524 | 925 | res = genl_family_find_byname(name); |
fa843095 SH |
926 | #ifdef CONFIG_MODULES |
927 | if (res == NULL) { | |
928 | genl_unlock(); | |
c74f2b26 | 929 | up_read(&cb_lock); |
e9412c37 | 930 | request_module("net-pf-%d-proto-%d-family-%s", |
fa843095 | 931 | PF_NETLINK, NETLINK_GENERIC, name); |
c74f2b26 | 932 | down_read(&cb_lock); |
fa843095 SH |
933 | genl_lock(); |
934 | res = genl_family_find_byname(name); | |
935 | } | |
936 | #endif | |
134e6375 | 937 | err = -ENOENT; |
482a8524 TG |
938 | } |
939 | ||
134e6375 JB |
940 | if (res == NULL) |
941 | return err; | |
942 | ||
943 | if (!res->netnsok && !net_eq(genl_info_net(info), &init_net)) { | |
944 | /* family doesn't exist here */ | |
945 | return -ENOENT; | |
482a8524 TG |
946 | } |
947 | ||
15e47304 | 948 | msg = ctrl_build_family_msg(res, info->snd_portid, info->snd_seq, |
2dbba6f7 | 949 | CTRL_CMD_NEWFAMILY); |
134e6375 JB |
950 | if (IS_ERR(msg)) |
951 | return PTR_ERR(msg); | |
482a8524 | 952 | |
134e6375 | 953 | return genlmsg_reply(msg, info); |
482a8524 TG |
954 | } |
955 | ||
c2ebb908 | 956 | static int genl_ctrl_event(int event, struct genl_family *family, |
2a94fe48 JB |
957 | const struct genl_multicast_group *grp, |
958 | int grp_id) | |
482a8524 TG |
959 | { |
960 | struct sk_buff *msg; | |
961 | ||
134e6375 JB |
962 | /* genl is still initialising */ |
963 | if (!init_net.genl_sock) | |
482a8524 TG |
964 | return 0; |
965 | ||
966 | switch (event) { | |
967 | case CTRL_CMD_NEWFAMILY: | |
968 | case CTRL_CMD_DELFAMILY: | |
c2ebb908 | 969 | WARN_ON(grp); |
134e6375 | 970 | msg = ctrl_build_family_msg(family, 0, 0, event); |
2dbba6f7 JB |
971 | break; |
972 | case CTRL_CMD_NEWMCAST_GRP: | |
973 | case CTRL_CMD_DELMCAST_GRP: | |
c2ebb908 | 974 | BUG_ON(!grp); |
2a94fe48 | 975 | msg = ctrl_build_mcgrp_msg(family, grp, grp_id, 0, 0, event); |
482a8524 | 976 | break; |
134e6375 JB |
977 | default: |
978 | return -EINVAL; | |
979 | } | |
980 | ||
981 | if (IS_ERR(msg)) | |
982 | return PTR_ERR(msg); | |
983 | ||
984 | if (!family->netnsok) { | |
68eb5503 | 985 | genlmsg_multicast_netns(&genl_ctrl, &init_net, msg, 0, |
2a94fe48 | 986 | 0, GFP_KERNEL); |
134e6375 JB |
987 | } else { |
988 | rcu_read_lock(); | |
68eb5503 | 989 | genlmsg_multicast_allns(&genl_ctrl, msg, 0, |
2a94fe48 | 990 | 0, GFP_ATOMIC); |
134e6375 | 991 | rcu_read_unlock(); |
482a8524 TG |
992 | } |
993 | ||
994 | return 0; | |
995 | } | |
996 | ||
c53ed742 JB |
997 | static struct genl_ops genl_ctrl_ops[] = { |
998 | { | |
999 | .cmd = CTRL_CMD_GETFAMILY, | |
1000 | .doit = ctrl_getfamily, | |
1001 | .dumpit = ctrl_dumpfamily, | |
1002 | .policy = ctrl_policy, | |
1003 | }, | |
482a8524 TG |
1004 | }; |
1005 | ||
2a94fe48 JB |
1006 | static struct genl_multicast_group genl_ctrl_groups[] = { |
1007 | { .name = "notify", }, | |
2dbba6f7 JB |
1008 | }; |
1009 | ||
023e2cfa | 1010 | static int genl_bind(struct net *net, int group) |
c380d9a7 | 1011 | { |
5ad63005 | 1012 | int i, err = -ENOENT; |
c380d9a7 JB |
1013 | |
1014 | down_read(&cb_lock); | |
1015 | for (i = 0; i < GENL_FAM_TAB_SIZE; i++) { | |
1016 | struct genl_family *f; | |
1017 | ||
1018 | list_for_each_entry(f, genl_family_chain(i), family_list) { | |
1019 | if (group >= f->mcgrp_offset && | |
1020 | group < f->mcgrp_offset + f->n_mcgrps) { | |
1021 | int fam_grp = group - f->mcgrp_offset; | |
1022 | ||
023e2cfa JB |
1023 | if (!f->netnsok && net != &init_net) |
1024 | err = -ENOENT; | |
1025 | else if (f->mcast_bind) | |
1026 | err = f->mcast_bind(net, fam_grp); | |
c380d9a7 JB |
1027 | else |
1028 | err = 0; | |
c380d9a7 JB |
1029 | break; |
1030 | } | |
1031 | } | |
1032 | } | |
1033 | up_read(&cb_lock); | |
1034 | ||
c380d9a7 JB |
1035 | return err; |
1036 | } | |
1037 | ||
023e2cfa | 1038 | static void genl_unbind(struct net *net, int group) |
c380d9a7 JB |
1039 | { |
1040 | int i; | |
c380d9a7 JB |
1041 | |
1042 | down_read(&cb_lock); | |
1043 | for (i = 0; i < GENL_FAM_TAB_SIZE; i++) { | |
1044 | struct genl_family *f; | |
1045 | ||
1046 | list_for_each_entry(f, genl_family_chain(i), family_list) { | |
1047 | if (group >= f->mcgrp_offset && | |
1048 | group < f->mcgrp_offset + f->n_mcgrps) { | |
1049 | int fam_grp = group - f->mcgrp_offset; | |
1050 | ||
1051 | if (f->mcast_unbind) | |
023e2cfa | 1052 | f->mcast_unbind(net, fam_grp); |
c380d9a7 JB |
1053 | break; |
1054 | } | |
1055 | } | |
1056 | } | |
1057 | up_read(&cb_lock); | |
c380d9a7 JB |
1058 | } |
1059 | ||
134e6375 JB |
1060 | static int __net_init genl_pernet_init(struct net *net) |
1061 | { | |
a31f2d17 PNA |
1062 | struct netlink_kernel_cfg cfg = { |
1063 | .input = genl_rcv, | |
9785e10a | 1064 | .flags = NL_CFG_F_NONROOT_RECV, |
c380d9a7 JB |
1065 | .bind = genl_bind, |
1066 | .unbind = genl_unbind, | |
a31f2d17 PNA |
1067 | }; |
1068 | ||
134e6375 | 1069 | /* we'll bump the group number right afterwards */ |
9f00d977 | 1070 | net->genl_sock = netlink_kernel_create(net, NETLINK_GENERIC, &cfg); |
134e6375 JB |
1071 | |
1072 | if (!net->genl_sock && net_eq(net, &init_net)) | |
1073 | panic("GENL: Cannot initialize generic netlink\n"); | |
1074 | ||
1075 | if (!net->genl_sock) | |
1076 | return -ENOMEM; | |
1077 | ||
1078 | return 0; | |
1079 | } | |
1080 | ||
1081 | static void __net_exit genl_pernet_exit(struct net *net) | |
1082 | { | |
1083 | netlink_kernel_release(net->genl_sock); | |
1084 | net->genl_sock = NULL; | |
1085 | } | |
1086 | ||
1087 | static struct pernet_operations genl_pernet_ops = { | |
1088 | .init = genl_pernet_init, | |
1089 | .exit = genl_pernet_exit, | |
1090 | }; | |
1091 | ||
482a8524 TG |
1092 | static int __init genl_init(void) |
1093 | { | |
1094 | int i, err; | |
1095 | ||
1096 | for (i = 0; i < GENL_FAM_TAB_SIZE; i++) | |
1097 | INIT_LIST_HEAD(&family_ht[i]); | |
1098 | ||
2a94fe48 JB |
1099 | err = genl_register_family_with_ops_groups(&genl_ctrl, genl_ctrl_ops, |
1100 | genl_ctrl_groups); | |
482a8524 | 1101 | if (err < 0) |
134e6375 | 1102 | goto problem; |
482a8524 | 1103 | |
134e6375 JB |
1104 | err = register_pernet_subsys(&genl_pernet_ops); |
1105 | if (err) | |
1106 | goto problem; | |
482a8524 TG |
1107 | |
1108 | return 0; | |
1109 | ||
134e6375 | 1110 | problem: |
482a8524 | 1111 | panic("GENL: Cannot register controller: %d\n", err); |
482a8524 TG |
1112 | } |
1113 | ||
1114 | subsys_initcall(genl_init); | |
1115 | ||
15e47304 | 1116 | static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group, |
134e6375 JB |
1117 | gfp_t flags) |
1118 | { | |
1119 | struct sk_buff *tmp; | |
1120 | struct net *net, *prev = NULL; | |
1121 | int err; | |
1122 | ||
1123 | for_each_net_rcu(net) { | |
1124 | if (prev) { | |
1125 | tmp = skb_clone(skb, flags); | |
1126 | if (!tmp) { | |
1127 | err = -ENOMEM; | |
1128 | goto error; | |
1129 | } | |
1130 | err = nlmsg_multicast(prev->genl_sock, tmp, | |
15e47304 | 1131 | portid, group, flags); |
134e6375 JB |
1132 | if (err) |
1133 | goto error; | |
1134 | } | |
1135 | ||
1136 | prev = net; | |
1137 | } | |
1138 | ||
15e47304 | 1139 | return nlmsg_multicast(prev->genl_sock, skb, portid, group, flags); |
134e6375 JB |
1140 | error: |
1141 | kfree_skb(skb); | |
1142 | return err; | |
1143 | } | |
1144 | ||
68eb5503 JB |
1145 | int genlmsg_multicast_allns(struct genl_family *family, struct sk_buff *skb, |
1146 | u32 portid, unsigned int group, gfp_t flags) | |
134e6375 | 1147 | { |
220815a9 | 1148 | if (WARN_ON_ONCE(group >= family->n_mcgrps)) |
2a94fe48 JB |
1149 | return -EINVAL; |
1150 | group = family->mcgrp_offset + group; | |
15e47304 | 1151 | return genlmsg_mcast(skb, portid, group, flags); |
134e6375 JB |
1152 | } |
1153 | EXPORT_SYMBOL(genlmsg_multicast_allns); | |
263ba61d | 1154 | |
92c14d9b JB |
1155 | void genl_notify(struct genl_family *family, struct sk_buff *skb, |
1156 | struct genl_info *info, u32 group, gfp_t flags) | |
263ba61d | 1157 | { |
92c14d9b | 1158 | struct net *net = genl_info_net(info); |
263ba61d PS |
1159 | struct sock *sk = net->genl_sock; |
1160 | int report = 0; | |
1161 | ||
92c14d9b JB |
1162 | if (info->nlhdr) |
1163 | report = nlmsg_report(info->nlhdr); | |
263ba61d | 1164 | |
220815a9 | 1165 | if (WARN_ON_ONCE(group >= family->n_mcgrps)) |
2a94fe48 JB |
1166 | return; |
1167 | group = family->mcgrp_offset + group; | |
92c14d9b | 1168 | nlmsg_notify(sk, skb, info->snd_portid, group, report, flags); |
263ba61d PS |
1169 | } |
1170 | EXPORT_SYMBOL(genl_notify); |