Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/subscr.c: TIPC subscription service | |
c4307285 | 3 | * |
593a5f22 | 4 | * Copyright (c) 2000-2006, Ericsson AB |
b97bf3fd | 5 | * Copyright (c) 2005, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
38 | #include "dbg.h" | |
39 | #include "subscr.h" | |
40 | #include "name_table.h" | |
41 | #include "ref.h" | |
42 | ||
43 | /** | |
44 | * struct subscriber - TIPC network topology subscriber | |
45 | * @ref: object reference to subscriber object itself | |
46 | * @lock: pointer to spinlock controlling access to subscriber object | |
47 | * @subscriber_list: adjacent subscribers in top. server's list of subscribers | |
48 | * @subscription_list: list of subscription objects for this subscriber | |
49 | * @port_ref: object reference to port used to communicate with subscriber | |
b97bf3fd | 50 | */ |
c4307285 | 51 | |
b97bf3fd PL |
52 | struct subscriber { |
53 | u32 ref; | |
c4307285 | 54 | spinlock_t *lock; |
b97bf3fd PL |
55 | struct list_head subscriber_list; |
56 | struct list_head subscription_list; | |
57 | u32 port_ref; | |
b97bf3fd PL |
58 | }; |
59 | ||
60 | /** | |
61 | * struct top_srv - TIPC network topology subscription service | |
62 | * @user_ref: TIPC userid of subscription service | |
63 | * @setup_port: reference to TIPC port that handles subscription requests | |
64 | * @subscription_count: number of active subscriptions (not subscribers!) | |
65 | * @subscriber_list: list of ports subscribing to service | |
66 | * @lock: spinlock govering access to subscriber list | |
67 | */ | |
68 | ||
69 | struct top_srv { | |
70 | u32 user_ref; | |
71 | u32 setup_port; | |
72 | atomic_t subscription_count; | |
73 | struct list_head subscriber_list; | |
74 | spinlock_t lock; | |
75 | }; | |
76 | ||
77 | static struct top_srv topsrv = { 0 }; | |
78 | ||
79 | /** | |
80 | * htohl - convert value to endianness used by destination | |
81 | * @in: value to convert | |
82 | * @swap: non-zero if endianness must be reversed | |
c4307285 | 83 | * |
b97bf3fd PL |
84 | * Returns converted value |
85 | */ | |
86 | ||
05790c64 | 87 | static u32 htohl(u32 in, int swap) |
b97bf3fd | 88 | { |
fc5ad582 | 89 | return swap ? (u32)___constant_swab32(in) : in; |
b97bf3fd PL |
90 | } |
91 | ||
92 | /** | |
93 | * subscr_send_event - send a message containing a tipc_event to the subscriber | |
94 | */ | |
95 | ||
c4307285 YH |
96 | static void subscr_send_event(struct subscription *sub, |
97 | u32 found_lower, | |
b97bf3fd | 98 | u32 found_upper, |
c4307285 YH |
99 | u32 event, |
100 | u32 port_ref, | |
b97bf3fd PL |
101 | u32 node) |
102 | { | |
103 | struct iovec msg_sect; | |
104 | ||
105 | msg_sect.iov_base = (void *)&sub->evt; | |
106 | msg_sect.iov_len = sizeof(struct tipc_event); | |
107 | ||
8e9501f5 AS |
108 | sub->evt.event = htohl(event, sub->swap); |
109 | sub->evt.found_lower = htohl(found_lower, sub->swap); | |
110 | sub->evt.found_upper = htohl(found_upper, sub->swap); | |
111 | sub->evt.port.ref = htohl(port_ref, sub->swap); | |
112 | sub->evt.port.node = htohl(node, sub->swap); | |
b97bf3fd PL |
113 | tipc_send(sub->owner->port_ref, 1, &msg_sect); |
114 | } | |
115 | ||
116 | /** | |
4323add6 | 117 | * tipc_subscr_overlap - test for subscription overlap with the given values |
b97bf3fd PL |
118 | * |
119 | * Returns 1 if there is overlap, otherwise 0. | |
120 | */ | |
121 | ||
c4307285 YH |
122 | int tipc_subscr_overlap(struct subscription *sub, |
123 | u32 found_lower, | |
4323add6 | 124 | u32 found_upper) |
b97bf3fd PL |
125 | |
126 | { | |
127 | if (found_lower < sub->seq.lower) | |
128 | found_lower = sub->seq.lower; | |
129 | if (found_upper > sub->seq.upper) | |
130 | found_upper = sub->seq.upper; | |
131 | if (found_lower > found_upper) | |
132 | return 0; | |
133 | return 1; | |
134 | } | |
135 | ||
136 | /** | |
4323add6 | 137 | * tipc_subscr_report_overlap - issue event if there is subscription overlap |
c4307285 | 138 | * |
b97bf3fd PL |
139 | * Protected by nameseq.lock in name_table.c |
140 | */ | |
141 | ||
c4307285 YH |
142 | void tipc_subscr_report_overlap(struct subscription *sub, |
143 | u32 found_lower, | |
4323add6 | 144 | u32 found_upper, |
c4307285 YH |
145 | u32 event, |
146 | u32 port_ref, | |
4323add6 PL |
147 | u32 node, |
148 | int must) | |
b97bf3fd PL |
149 | { |
150 | dbg("Rep overlap %u:%u,%u<->%u,%u\n", sub->seq.type, sub->seq.lower, | |
151 | sub->seq.upper, found_lower, found_upper); | |
4323add6 | 152 | if (!tipc_subscr_overlap(sub, found_lower, found_upper)) |
b97bf3fd | 153 | return; |
eb409460 | 154 | if (!must && !(sub->filter & TIPC_SUB_PORTS)) |
b97bf3fd | 155 | return; |
e15f8804 AS |
156 | |
157 | sub->event_cb(sub, found_lower, found_upper, event, port_ref, node); | |
b97bf3fd PL |
158 | } |
159 | ||
160 | /** | |
161 | * subscr_timeout - subscription timeout has occurred | |
162 | */ | |
163 | ||
164 | static void subscr_timeout(struct subscription *sub) | |
165 | { | |
166 | struct subscriber *subscriber; | |
167 | u32 subscriber_ref; | |
168 | ||
169 | /* Validate subscriber reference (in case subscriber is terminating) */ | |
170 | ||
171 | subscriber_ref = sub->owner->ref; | |
4323add6 | 172 | subscriber = (struct subscriber *)tipc_ref_lock(subscriber_ref); |
b97bf3fd PL |
173 | if (subscriber == NULL) |
174 | return; | |
175 | ||
eb409460 LC |
176 | /* Validate timeout (in case subscription is being cancelled) */ |
177 | ||
178 | if (sub->timeout == TIPC_WAIT_FOREVER) { | |
179 | tipc_ref_unlock(subscriber_ref); | |
180 | return; | |
181 | } | |
182 | ||
b97bf3fd PL |
183 | /* Unlink subscription from name table */ |
184 | ||
4323add6 | 185 | tipc_nametbl_unsubscribe(sub); |
b97bf3fd PL |
186 | |
187 | /* Notify subscriber of timeout, then unlink subscription */ | |
188 | ||
c4307285 YH |
189 | subscr_send_event(sub, |
190 | sub->evt.s.seq.lower, | |
b97bf3fd | 191 | sub->evt.s.seq.upper, |
c4307285 YH |
192 | TIPC_SUBSCR_TIMEOUT, |
193 | 0, | |
b97bf3fd PL |
194 | 0); |
195 | list_del(&sub->subscription_list); | |
196 | ||
197 | /* Now destroy subscription */ | |
198 | ||
4323add6 | 199 | tipc_ref_unlock(subscriber_ref); |
b97bf3fd PL |
200 | k_term_timer(&sub->timer); |
201 | kfree(sub); | |
202 | atomic_dec(&topsrv.subscription_count); | |
203 | } | |
204 | ||
eb409460 LC |
205 | /** |
206 | * subscr_del - delete a subscription within a subscription list | |
207 | * | |
208 | * Called with subscriber locked. | |
209 | */ | |
210 | ||
211 | static void subscr_del(struct subscription *sub) | |
212 | { | |
213 | tipc_nametbl_unsubscribe(sub); | |
214 | list_del(&sub->subscription_list); | |
215 | kfree(sub); | |
216 | atomic_dec(&topsrv.subscription_count); | |
217 | } | |
218 | ||
b97bf3fd PL |
219 | /** |
220 | * subscr_terminate - terminate communication with a subscriber | |
c4307285 | 221 | * |
b97bf3fd | 222 | * Called with subscriber locked. Routine must temporarily release this lock |
c4307285 | 223 | * to enable subscription timeout routine(s) to finish without deadlocking; |
b97bf3fd | 224 | * the lock is then reclaimed to allow caller to release it upon return. |
c4307285 | 225 | * (This should work even in the unlikely event some other thread creates |
b97bf3fd PL |
226 | * a new object reference in the interim that uses this lock; this routine will |
227 | * simply wait for it to be released, then claim it.) | |
228 | */ | |
229 | ||
230 | static void subscr_terminate(struct subscriber *subscriber) | |
231 | { | |
232 | struct subscription *sub; | |
233 | struct subscription *sub_temp; | |
234 | ||
235 | /* Invalidate subscriber reference */ | |
236 | ||
4323add6 | 237 | tipc_ref_discard(subscriber->ref); |
b97bf3fd PL |
238 | spin_unlock_bh(subscriber->lock); |
239 | ||
240 | /* Destroy any existing subscriptions for subscriber */ | |
c4307285 | 241 | |
b97bf3fd PL |
242 | list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list, |
243 | subscription_list) { | |
244 | if (sub->timeout != TIPC_WAIT_FOREVER) { | |
245 | k_cancel_timer(&sub->timer); | |
246 | k_term_timer(&sub->timer); | |
247 | } | |
eb409460 | 248 | dbg("Term: Removing sub %u,%u,%u from subscriber %x list\n", |
b97bf3fd | 249 | sub->seq.type, sub->seq.lower, sub->seq.upper, subscriber); |
eb409460 | 250 | subscr_del(sub); |
b97bf3fd PL |
251 | } |
252 | ||
253 | /* Sever connection to subscriber */ | |
254 | ||
255 | tipc_shutdown(subscriber->port_ref); | |
256 | tipc_deleteport(subscriber->port_ref); | |
257 | ||
258 | /* Remove subscriber from topology server's subscriber list */ | |
259 | ||
260 | spin_lock_bh(&topsrv.lock); | |
261 | list_del(&subscriber->subscriber_list); | |
262 | spin_unlock_bh(&topsrv.lock); | |
263 | ||
264 | /* Now destroy subscriber */ | |
265 | ||
266 | spin_lock_bh(subscriber->lock); | |
267 | kfree(subscriber); | |
268 | } | |
269 | ||
eb409460 LC |
270 | /** |
271 | * subscr_cancel - handle subscription cancellation request | |
272 | * | |
273 | * Called with subscriber locked. Routine must temporarily release this lock | |
274 | * to enable the subscription timeout routine to finish without deadlocking; | |
275 | * the lock is then reclaimed to allow caller to release it upon return. | |
276 | * | |
277 | * Note that fields of 's' use subscriber's endianness! | |
278 | */ | |
279 | ||
280 | static void subscr_cancel(struct tipc_subscr *s, | |
281 | struct subscriber *subscriber) | |
282 | { | |
283 | struct subscription *sub; | |
284 | struct subscription *sub_temp; | |
285 | int found = 0; | |
286 | ||
287 | /* Find first matching subscription, exit if not found */ | |
288 | ||
289 | list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list, | |
290 | subscription_list) { | |
291 | if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) { | |
292 | found = 1; | |
293 | break; | |
294 | } | |
295 | } | |
296 | if (!found) | |
297 | return; | |
298 | ||
299 | /* Cancel subscription timer (if used), then delete subscription */ | |
300 | ||
301 | if (sub->timeout != TIPC_WAIT_FOREVER) { | |
302 | sub->timeout = TIPC_WAIT_FOREVER; | |
303 | spin_unlock_bh(subscriber->lock); | |
304 | k_cancel_timer(&sub->timer); | |
305 | k_term_timer(&sub->timer); | |
306 | spin_lock_bh(subscriber->lock); | |
307 | } | |
308 | dbg("Cancel: removing sub %u,%u,%u from subscriber %x list\n", | |
309 | sub->seq.type, sub->seq.lower, sub->seq.upper, subscriber); | |
310 | subscr_del(sub); | |
311 | } | |
312 | ||
b97bf3fd PL |
313 | /** |
314 | * subscr_subscribe - create subscription for subscriber | |
c4307285 | 315 | * |
b97bf3fd PL |
316 | * Called with subscriber locked |
317 | */ | |
318 | ||
319 | static void subscr_subscribe(struct tipc_subscr *s, | |
320 | struct subscriber *subscriber) | |
321 | { | |
322 | struct subscription *sub; | |
8e9501f5 | 323 | int swap; |
b97bf3fd | 324 | |
8e9501f5 | 325 | /* Determine subscriber's endianness */ |
eb409460 | 326 | |
8e9501f5 | 327 | swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE)); |
eb409460 LC |
328 | |
329 | /* Detect & process a subscription cancellation request */ | |
330 | ||
8e9501f5 AS |
331 | if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) { |
332 | s->filter &= ~htohl(TIPC_SUB_CANCEL, swap); | |
eb409460 LC |
333 | subscr_cancel(s, subscriber); |
334 | return; | |
335 | } | |
336 | ||
b97bf3fd PL |
337 | /* Refuse subscription if global limit exceeded */ |
338 | ||
339 | if (atomic_read(&topsrv.subscription_count) >= tipc_max_subscriptions) { | |
a10bd924 AS |
340 | warn("Subscription rejected, subscription limit reached (%u)\n", |
341 | tipc_max_subscriptions); | |
b97bf3fd PL |
342 | subscr_terminate(subscriber); |
343 | return; | |
344 | } | |
345 | ||
346 | /* Allocate subscription object */ | |
347 | ||
2710b57f | 348 | sub = kzalloc(sizeof(*sub), GFP_ATOMIC); |
a10bd924 AS |
349 | if (!sub) { |
350 | warn("Subscription rejected, no memory\n"); | |
b97bf3fd PL |
351 | subscr_terminate(subscriber); |
352 | return; | |
353 | } | |
354 | ||
b97bf3fd PL |
355 | /* Initialize subscription object */ |
356 | ||
8e9501f5 AS |
357 | sub->seq.type = htohl(s->seq.type, swap); |
358 | sub->seq.lower = htohl(s->seq.lower, swap); | |
359 | sub->seq.upper = htohl(s->seq.upper, swap); | |
360 | sub->timeout = htohl(s->timeout, swap); | |
361 | sub->filter = htohl(s->filter, swap); | |
eb409460 LC |
362 | if ((!(sub->filter & TIPC_SUB_PORTS) |
363 | == !(sub->filter & TIPC_SUB_SERVICE)) | |
b97bf3fd | 364 | || (sub->seq.lower > sub->seq.upper)) { |
a10bd924 | 365 | warn("Subscription rejected, illegal request\n"); |
b97bf3fd PL |
366 | kfree(sub); |
367 | subscr_terminate(subscriber); | |
368 | return; | |
369 | } | |
e15f8804 | 370 | sub->event_cb = subscr_send_event; |
b97bf3fd PL |
371 | memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr)); |
372 | INIT_LIST_HEAD(&sub->subscription_list); | |
373 | INIT_LIST_HEAD(&sub->nameseq_list); | |
374 | list_add(&sub->subscription_list, &subscriber->subscription_list); | |
8e9501f5 | 375 | sub->swap = swap; |
b97bf3fd PL |
376 | atomic_inc(&topsrv.subscription_count); |
377 | if (sub->timeout != TIPC_WAIT_FOREVER) { | |
378 | k_init_timer(&sub->timer, | |
379 | (Handler)subscr_timeout, (unsigned long)sub); | |
380 | k_start_timer(&sub->timer, sub->timeout); | |
381 | } | |
382 | sub->owner = subscriber; | |
4323add6 | 383 | tipc_nametbl_subscribe(sub); |
b97bf3fd PL |
384 | } |
385 | ||
386 | /** | |
387 | * subscr_conn_shutdown_event - handle termination request from subscriber | |
388 | */ | |
389 | ||
390 | static void subscr_conn_shutdown_event(void *usr_handle, | |
391 | u32 portref, | |
392 | struct sk_buff **buf, | |
393 | unsigned char const *data, | |
394 | unsigned int size, | |
395 | int reason) | |
396 | { | |
880b005f | 397 | struct subscriber *subscriber; |
b97bf3fd PL |
398 | spinlock_t *subscriber_lock; |
399 | ||
4323add6 | 400 | subscriber = tipc_ref_lock((u32)(unsigned long)usr_handle); |
b97bf3fd PL |
401 | if (subscriber == NULL) |
402 | return; | |
403 | ||
404 | subscriber_lock = subscriber->lock; | |
405 | subscr_terminate(subscriber); | |
406 | spin_unlock_bh(subscriber_lock); | |
407 | } | |
408 | ||
409 | /** | |
410 | * subscr_conn_msg_event - handle new subscription request from subscriber | |
411 | */ | |
412 | ||
413 | static void subscr_conn_msg_event(void *usr_handle, | |
414 | u32 port_ref, | |
415 | struct sk_buff **buf, | |
416 | const unchar *data, | |
417 | u32 size) | |
418 | { | |
880b005f | 419 | struct subscriber *subscriber; |
b97bf3fd PL |
420 | spinlock_t *subscriber_lock; |
421 | ||
4323add6 | 422 | subscriber = tipc_ref_lock((u32)(unsigned long)usr_handle); |
b97bf3fd PL |
423 | if (subscriber == NULL) |
424 | return; | |
425 | ||
426 | subscriber_lock = subscriber->lock; | |
427 | if (size != sizeof(struct tipc_subscr)) | |
428 | subscr_terminate(subscriber); | |
429 | else | |
430 | subscr_subscribe((struct tipc_subscr *)data, subscriber); | |
c4307285 | 431 | |
b97bf3fd PL |
432 | spin_unlock_bh(subscriber_lock); |
433 | } | |
434 | ||
435 | /** | |
436 | * subscr_named_msg_event - handle request to establish a new subscriber | |
437 | */ | |
438 | ||
439 | static void subscr_named_msg_event(void *usr_handle, | |
440 | u32 port_ref, | |
441 | struct sk_buff **buf, | |
442 | const unchar *data, | |
443 | u32 size, | |
c4307285 | 444 | u32 importance, |
b97bf3fd PL |
445 | struct tipc_portid const *orig, |
446 | struct tipc_name_seq const *dest) | |
447 | { | |
448 | struct subscriber *subscriber; | |
1fc54d8f | 449 | struct iovec msg_sect = {NULL, 0}; |
b97bf3fd PL |
450 | spinlock_t *subscriber_lock; |
451 | ||
452 | dbg("subscr_named_msg_event: orig = %x own = %x,\n", | |
453 | orig->node, tipc_own_addr); | |
454 | if (size && (size != sizeof(struct tipc_subscr))) { | |
a10bd924 | 455 | warn("Subscriber rejected, invalid subscription size\n"); |
b97bf3fd PL |
456 | return; |
457 | } | |
458 | ||
459 | /* Create subscriber object */ | |
460 | ||
0da974f4 | 461 | subscriber = kzalloc(sizeof(struct subscriber), GFP_ATOMIC); |
b97bf3fd | 462 | if (subscriber == NULL) { |
a10bd924 | 463 | warn("Subscriber rejected, no memory\n"); |
b97bf3fd PL |
464 | return; |
465 | } | |
b97bf3fd PL |
466 | INIT_LIST_HEAD(&subscriber->subscription_list); |
467 | INIT_LIST_HEAD(&subscriber->subscriber_list); | |
4323add6 | 468 | subscriber->ref = tipc_ref_acquire(subscriber, &subscriber->lock); |
b97bf3fd | 469 | if (subscriber->ref == 0) { |
a10bd924 | 470 | warn("Subscriber rejected, reference table exhausted\n"); |
b97bf3fd PL |
471 | kfree(subscriber); |
472 | return; | |
473 | } | |
7ef43eba | 474 | spin_unlock_bh(subscriber->lock); |
b97bf3fd PL |
475 | |
476 | /* Establish a connection to subscriber */ | |
477 | ||
478 | tipc_createport(topsrv.user_ref, | |
880b005f | 479 | (void *)(unsigned long)subscriber->ref, |
b97bf3fd | 480 | importance, |
1fc54d8f SR |
481 | NULL, |
482 | NULL, | |
b97bf3fd | 483 | subscr_conn_shutdown_event, |
1fc54d8f SR |
484 | NULL, |
485 | NULL, | |
b97bf3fd | 486 | subscr_conn_msg_event, |
1fc54d8f | 487 | NULL, |
b97bf3fd PL |
488 | &subscriber->port_ref); |
489 | if (subscriber->port_ref == 0) { | |
a10bd924 | 490 | warn("Subscriber rejected, unable to create port\n"); |
4323add6 | 491 | tipc_ref_discard(subscriber->ref); |
b97bf3fd PL |
492 | kfree(subscriber); |
493 | return; | |
494 | } | |
495 | tipc_connect2port(subscriber->port_ref, orig); | |
496 | ||
497 | ||
498 | /* Add subscriber to topology server's subscriber list */ | |
499 | ||
4323add6 | 500 | tipc_ref_lock(subscriber->ref); |
b97bf3fd PL |
501 | spin_lock_bh(&topsrv.lock); |
502 | list_add(&subscriber->subscriber_list, &topsrv.subscriber_list); | |
503 | spin_unlock_bh(&topsrv.lock); | |
504 | ||
505 | /* | |
506 | * Subscribe now if message contains a subscription, | |
507 | * otherwise send an empty response to complete connection handshaking | |
508 | */ | |
509 | ||
510 | subscriber_lock = subscriber->lock; | |
511 | if (size) | |
512 | subscr_subscribe((struct tipc_subscr *)data, subscriber); | |
513 | else | |
514 | tipc_send(subscriber->port_ref, 1, &msg_sect); | |
515 | ||
516 | spin_unlock_bh(subscriber_lock); | |
517 | } | |
518 | ||
4323add6 | 519 | int tipc_subscr_start(void) |
b97bf3fd PL |
520 | { |
521 | struct tipc_name_seq seq = {TIPC_TOP_SRV, TIPC_TOP_SRV, TIPC_TOP_SRV}; | |
522 | int res = -1; | |
523 | ||
524 | memset(&topsrv, 0, sizeof (topsrv)); | |
34af946a | 525 | spin_lock_init(&topsrv.lock); |
b97bf3fd PL |
526 | INIT_LIST_HEAD(&topsrv.subscriber_list); |
527 | ||
528 | spin_lock_bh(&topsrv.lock); | |
1fc54d8f | 529 | res = tipc_attach(&topsrv.user_ref, NULL, NULL); |
b97bf3fd PL |
530 | if (res) { |
531 | spin_unlock_bh(&topsrv.lock); | |
532 | return res; | |
533 | } | |
534 | ||
c4307285 YH |
535 | res = tipc_createport(topsrv.user_ref, |
536 | NULL, | |
537 | TIPC_CRITICAL_IMPORTANCE, | |
538 | NULL, | |
539 | NULL, | |
540 | NULL, | |
541 | NULL, | |
542 | subscr_named_msg_event, | |
543 | NULL, | |
544 | NULL, | |
545 | &topsrv.setup_port); | |
546 | if (res) | |
b97bf3fd PL |
547 | goto failed; |
548 | ||
c4307285 YH |
549 | res = tipc_nametbl_publish_rsv(topsrv.setup_port, TIPC_NODE_SCOPE, &seq); |
550 | if (res) | |
b97bf3fd PL |
551 | goto failed; |
552 | ||
553 | spin_unlock_bh(&topsrv.lock); | |
554 | return 0; | |
555 | ||
556 | failed: | |
d0a14a9d | 557 | err("Failed to create subscription service\n"); |
b97bf3fd PL |
558 | tipc_detach(topsrv.user_ref); |
559 | topsrv.user_ref = 0; | |
560 | spin_unlock_bh(&topsrv.lock); | |
561 | return res; | |
562 | } | |
563 | ||
4323add6 | 564 | void tipc_subscr_stop(void) |
b97bf3fd PL |
565 | { |
566 | struct subscriber *subscriber; | |
567 | struct subscriber *subscriber_temp; | |
568 | spinlock_t *subscriber_lock; | |
569 | ||
570 | if (topsrv.user_ref) { | |
571 | tipc_deleteport(topsrv.setup_port); | |
c4307285 | 572 | list_for_each_entry_safe(subscriber, subscriber_temp, |
b97bf3fd PL |
573 | &topsrv.subscriber_list, |
574 | subscriber_list) { | |
4323add6 | 575 | tipc_ref_lock(subscriber->ref); |
b97bf3fd PL |
576 | subscriber_lock = subscriber->lock; |
577 | subscr_terminate(subscriber); | |
578 | spin_unlock_bh(subscriber_lock); | |
579 | } | |
580 | tipc_detach(topsrv.user_ref); | |
581 | topsrv.user_ref = 0; | |
582 | } | |
583 | } | |
584 | ||
585 | ||
586 | int tipc_ispublished(struct tipc_name const *name) | |
587 | { | |
588 | u32 domain = 0; | |
589 | ||
4323add6 | 590 | return(tipc_nametbl_translate(name->type, name->instance,&domain) != 0); |
b97bf3fd PL |
591 | } |
592 |