Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/subscr.c: TIPC subscription service | |
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 | |
50 | * @swap: indicates if subscriber uses opposite endianness in its messages | |
51 | */ | |
52 | ||
53 | struct subscriber { | |
54 | u32 ref; | |
55 | spinlock_t *lock; | |
56 | struct list_head subscriber_list; | |
57 | struct list_head subscription_list; | |
58 | u32 port_ref; | |
59 | int swap; | |
60 | }; | |
61 | ||
62 | /** | |
63 | * struct top_srv - TIPC network topology subscription service | |
64 | * @user_ref: TIPC userid of subscription service | |
65 | * @setup_port: reference to TIPC port that handles subscription requests | |
66 | * @subscription_count: number of active subscriptions (not subscribers!) | |
67 | * @subscriber_list: list of ports subscribing to service | |
68 | * @lock: spinlock govering access to subscriber list | |
69 | */ | |
70 | ||
71 | struct top_srv { | |
72 | u32 user_ref; | |
73 | u32 setup_port; | |
74 | atomic_t subscription_count; | |
75 | struct list_head subscriber_list; | |
76 | spinlock_t lock; | |
77 | }; | |
78 | ||
79 | static struct top_srv topsrv = { 0 }; | |
80 | ||
81 | /** | |
82 | * htohl - convert value to endianness used by destination | |
83 | * @in: value to convert | |
84 | * @swap: non-zero if endianness must be reversed | |
85 | * | |
86 | * Returns converted value | |
87 | */ | |
88 | ||
05790c64 | 89 | static u32 htohl(u32 in, int swap) |
b97bf3fd PL |
90 | { |
91 | char *c = (char *)∈ | |
92 | ||
93 | return swap ? ((c[3] << 3) + (c[2] << 2) + (c[1] << 1) + c[0]) : in; | |
94 | } | |
95 | ||
96 | /** | |
97 | * subscr_send_event - send a message containing a tipc_event to the subscriber | |
98 | */ | |
99 | ||
100 | static void subscr_send_event(struct subscription *sub, | |
101 | u32 found_lower, | |
102 | u32 found_upper, | |
103 | u32 event, | |
104 | u32 port_ref, | |
105 | u32 node) | |
106 | { | |
107 | struct iovec msg_sect; | |
108 | ||
109 | msg_sect.iov_base = (void *)&sub->evt; | |
110 | msg_sect.iov_len = sizeof(struct tipc_event); | |
111 | ||
112 | sub->evt.event = htohl(event, sub->owner->swap); | |
113 | sub->evt.found_lower = htohl(found_lower, sub->owner->swap); | |
114 | sub->evt.found_upper = htohl(found_upper, sub->owner->swap); | |
115 | sub->evt.port.ref = htohl(port_ref, sub->owner->swap); | |
116 | sub->evt.port.node = htohl(node, sub->owner->swap); | |
117 | tipc_send(sub->owner->port_ref, 1, &msg_sect); | |
118 | } | |
119 | ||
120 | /** | |
4323add6 | 121 | * tipc_subscr_overlap - test for subscription overlap with the given values |
b97bf3fd PL |
122 | * |
123 | * Returns 1 if there is overlap, otherwise 0. | |
124 | */ | |
125 | ||
4323add6 PL |
126 | int tipc_subscr_overlap(struct subscription *sub, |
127 | u32 found_lower, | |
128 | u32 found_upper) | |
b97bf3fd PL |
129 | |
130 | { | |
131 | if (found_lower < sub->seq.lower) | |
132 | found_lower = sub->seq.lower; | |
133 | if (found_upper > sub->seq.upper) | |
134 | found_upper = sub->seq.upper; | |
135 | if (found_lower > found_upper) | |
136 | return 0; | |
137 | return 1; | |
138 | } | |
139 | ||
140 | /** | |
4323add6 | 141 | * tipc_subscr_report_overlap - issue event if there is subscription overlap |
b97bf3fd PL |
142 | * |
143 | * Protected by nameseq.lock in name_table.c | |
144 | */ | |
145 | ||
4323add6 PL |
146 | void tipc_subscr_report_overlap(struct subscription *sub, |
147 | u32 found_lower, | |
148 | u32 found_upper, | |
149 | u32 event, | |
150 | u32 port_ref, | |
151 | u32 node, | |
152 | int must) | |
b97bf3fd PL |
153 | { |
154 | dbg("Rep overlap %u:%u,%u<->%u,%u\n", sub->seq.type, sub->seq.lower, | |
155 | sub->seq.upper, found_lower, found_upper); | |
4323add6 | 156 | if (!tipc_subscr_overlap(sub, found_lower, found_upper)) |
b97bf3fd | 157 | return; |
eb409460 | 158 | if (!must && !(sub->filter & TIPC_SUB_PORTS)) |
b97bf3fd PL |
159 | return; |
160 | subscr_send_event(sub, found_lower, found_upper, event, port_ref, node); | |
161 | } | |
162 | ||
163 | /** | |
164 | * subscr_timeout - subscription timeout has occurred | |
165 | */ | |
166 | ||
167 | static void subscr_timeout(struct subscription *sub) | |
168 | { | |
169 | struct subscriber *subscriber; | |
170 | u32 subscriber_ref; | |
171 | ||
172 | /* Validate subscriber reference (in case subscriber is terminating) */ | |
173 | ||
174 | subscriber_ref = sub->owner->ref; | |
4323add6 | 175 | subscriber = (struct subscriber *)tipc_ref_lock(subscriber_ref); |
b97bf3fd PL |
176 | if (subscriber == NULL) |
177 | return; | |
178 | ||
eb409460 LC |
179 | /* Validate timeout (in case subscription is being cancelled) */ |
180 | ||
181 | if (sub->timeout == TIPC_WAIT_FOREVER) { | |
182 | tipc_ref_unlock(subscriber_ref); | |
183 | return; | |
184 | } | |
185 | ||
b97bf3fd PL |
186 | /* Unlink subscription from name table */ |
187 | ||
4323add6 | 188 | tipc_nametbl_unsubscribe(sub); |
b97bf3fd PL |
189 | |
190 | /* Notify subscriber of timeout, then unlink subscription */ | |
191 | ||
192 | subscr_send_event(sub, | |
193 | sub->evt.s.seq.lower, | |
194 | sub->evt.s.seq.upper, | |
195 | TIPC_SUBSCR_TIMEOUT, | |
196 | 0, | |
197 | 0); | |
198 | list_del(&sub->subscription_list); | |
199 | ||
200 | /* Now destroy subscription */ | |
201 | ||
4323add6 | 202 | tipc_ref_unlock(subscriber_ref); |
b97bf3fd PL |
203 | k_term_timer(&sub->timer); |
204 | kfree(sub); | |
205 | atomic_dec(&topsrv.subscription_count); | |
206 | } | |
207 | ||
eb409460 LC |
208 | /** |
209 | * subscr_del - delete a subscription within a subscription list | |
210 | * | |
211 | * Called with subscriber locked. | |
212 | */ | |
213 | ||
214 | static void subscr_del(struct subscription *sub) | |
215 | { | |
216 | tipc_nametbl_unsubscribe(sub); | |
217 | list_del(&sub->subscription_list); | |
218 | kfree(sub); | |
219 | atomic_dec(&topsrv.subscription_count); | |
220 | } | |
221 | ||
b97bf3fd PL |
222 | /** |
223 | * subscr_terminate - terminate communication with a subscriber | |
224 | * | |
225 | * Called with subscriber locked. Routine must temporarily release this lock | |
226 | * to enable subscription timeout routine(s) to finish without deadlocking; | |
227 | * the lock is then reclaimed to allow caller to release it upon return. | |
228 | * (This should work even in the unlikely event some other thread creates | |
229 | * a new object reference in the interim that uses this lock; this routine will | |
230 | * simply wait for it to be released, then claim it.) | |
231 | */ | |
232 | ||
233 | static void subscr_terminate(struct subscriber *subscriber) | |
234 | { | |
235 | struct subscription *sub; | |
236 | struct subscription *sub_temp; | |
237 | ||
238 | /* Invalidate subscriber reference */ | |
239 | ||
4323add6 | 240 | tipc_ref_discard(subscriber->ref); |
b97bf3fd PL |
241 | spin_unlock_bh(subscriber->lock); |
242 | ||
243 | /* Destroy any existing subscriptions for subscriber */ | |
244 | ||
245 | list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list, | |
246 | subscription_list) { | |
247 | if (sub->timeout != TIPC_WAIT_FOREVER) { | |
248 | k_cancel_timer(&sub->timer); | |
249 | k_term_timer(&sub->timer); | |
250 | } | |
eb409460 | 251 | dbg("Term: Removing sub %u,%u,%u from subscriber %x list\n", |
b97bf3fd | 252 | sub->seq.type, sub->seq.lower, sub->seq.upper, subscriber); |
eb409460 | 253 | subscr_del(sub); |
b97bf3fd PL |
254 | } |
255 | ||
256 | /* Sever connection to subscriber */ | |
257 | ||
258 | tipc_shutdown(subscriber->port_ref); | |
259 | tipc_deleteport(subscriber->port_ref); | |
260 | ||
261 | /* Remove subscriber from topology server's subscriber list */ | |
262 | ||
263 | spin_lock_bh(&topsrv.lock); | |
264 | list_del(&subscriber->subscriber_list); | |
265 | spin_unlock_bh(&topsrv.lock); | |
266 | ||
267 | /* Now destroy subscriber */ | |
268 | ||
269 | spin_lock_bh(subscriber->lock); | |
270 | kfree(subscriber); | |
271 | } | |
272 | ||
eb409460 LC |
273 | /** |
274 | * subscr_cancel - handle subscription cancellation request | |
275 | * | |
276 | * Called with subscriber locked. Routine must temporarily release this lock | |
277 | * to enable the subscription timeout routine to finish without deadlocking; | |
278 | * the lock is then reclaimed to allow caller to release it upon return. | |
279 | * | |
280 | * Note that fields of 's' use subscriber's endianness! | |
281 | */ | |
282 | ||
283 | static void subscr_cancel(struct tipc_subscr *s, | |
284 | struct subscriber *subscriber) | |
285 | { | |
286 | struct subscription *sub; | |
287 | struct subscription *sub_temp; | |
288 | int found = 0; | |
289 | ||
290 | /* Find first matching subscription, exit if not found */ | |
291 | ||
292 | list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list, | |
293 | subscription_list) { | |
294 | if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) { | |
295 | found = 1; | |
296 | break; | |
297 | } | |
298 | } | |
299 | if (!found) | |
300 | return; | |
301 | ||
302 | /* Cancel subscription timer (if used), then delete subscription */ | |
303 | ||
304 | if (sub->timeout != TIPC_WAIT_FOREVER) { | |
305 | sub->timeout = TIPC_WAIT_FOREVER; | |
306 | spin_unlock_bh(subscriber->lock); | |
307 | k_cancel_timer(&sub->timer); | |
308 | k_term_timer(&sub->timer); | |
309 | spin_lock_bh(subscriber->lock); | |
310 | } | |
311 | dbg("Cancel: removing sub %u,%u,%u from subscriber %x list\n", | |
312 | sub->seq.type, sub->seq.lower, sub->seq.upper, subscriber); | |
313 | subscr_del(sub); | |
314 | } | |
315 | ||
b97bf3fd PL |
316 | /** |
317 | * subscr_subscribe - create subscription for subscriber | |
318 | * | |
319 | * Called with subscriber locked | |
320 | */ | |
321 | ||
322 | static void subscr_subscribe(struct tipc_subscr *s, | |
323 | struct subscriber *subscriber) | |
324 | { | |
325 | struct subscription *sub; | |
326 | ||
eb409460 LC |
327 | /* Determine/update subscriber's endianness */ |
328 | ||
329 | if (s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE)) | |
330 | subscriber->swap = 0; | |
331 | else | |
332 | subscriber->swap = 1; | |
333 | ||
334 | /* Detect & process a subscription cancellation request */ | |
335 | ||
336 | if (s->filter & htohl(TIPC_SUB_CANCEL, subscriber->swap)) { | |
337 | s->filter &= ~htohl(TIPC_SUB_CANCEL, subscriber->swap); | |
338 | subscr_cancel(s, subscriber); | |
339 | return; | |
340 | } | |
341 | ||
b97bf3fd PL |
342 | /* Refuse subscription if global limit exceeded */ |
343 | ||
344 | if (atomic_read(&topsrv.subscription_count) >= tipc_max_subscriptions) { | |
a10bd924 AS |
345 | warn("Subscription rejected, subscription limit reached (%u)\n", |
346 | tipc_max_subscriptions); | |
b97bf3fd PL |
347 | subscr_terminate(subscriber); |
348 | return; | |
349 | } | |
350 | ||
351 | /* Allocate subscription object */ | |
352 | ||
353 | sub = kmalloc(sizeof(*sub), GFP_ATOMIC); | |
a10bd924 AS |
354 | if (!sub) { |
355 | warn("Subscription rejected, no memory\n"); | |
b97bf3fd PL |
356 | subscr_terminate(subscriber); |
357 | return; | |
358 | } | |
359 | ||
b97bf3fd PL |
360 | /* Initialize subscription object */ |
361 | ||
362 | memset(sub, 0, sizeof(*sub)); | |
363 | sub->seq.type = htohl(s->seq.type, subscriber->swap); | |
364 | sub->seq.lower = htohl(s->seq.lower, subscriber->swap); | |
365 | sub->seq.upper = htohl(s->seq.upper, subscriber->swap); | |
366 | sub->timeout = htohl(s->timeout, subscriber->swap); | |
367 | sub->filter = htohl(s->filter, subscriber->swap); | |
eb409460 LC |
368 | if ((!(sub->filter & TIPC_SUB_PORTS) |
369 | == !(sub->filter & TIPC_SUB_SERVICE)) | |
b97bf3fd | 370 | || (sub->seq.lower > sub->seq.upper)) { |
a10bd924 | 371 | warn("Subscription rejected, illegal request\n"); |
b97bf3fd PL |
372 | kfree(sub); |
373 | subscr_terminate(subscriber); | |
374 | return; | |
375 | } | |
376 | memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr)); | |
377 | INIT_LIST_HEAD(&sub->subscription_list); | |
378 | INIT_LIST_HEAD(&sub->nameseq_list); | |
379 | list_add(&sub->subscription_list, &subscriber->subscription_list); | |
380 | atomic_inc(&topsrv.subscription_count); | |
381 | if (sub->timeout != TIPC_WAIT_FOREVER) { | |
382 | k_init_timer(&sub->timer, | |
383 | (Handler)subscr_timeout, (unsigned long)sub); | |
384 | k_start_timer(&sub->timer, sub->timeout); | |
385 | } | |
386 | sub->owner = subscriber; | |
4323add6 | 387 | tipc_nametbl_subscribe(sub); |
b97bf3fd PL |
388 | } |
389 | ||
390 | /** | |
391 | * subscr_conn_shutdown_event - handle termination request from subscriber | |
392 | */ | |
393 | ||
394 | static void subscr_conn_shutdown_event(void *usr_handle, | |
395 | u32 portref, | |
396 | struct sk_buff **buf, | |
397 | unsigned char const *data, | |
398 | unsigned int size, | |
399 | int reason) | |
400 | { | |
880b005f | 401 | struct subscriber *subscriber; |
b97bf3fd PL |
402 | spinlock_t *subscriber_lock; |
403 | ||
4323add6 | 404 | subscriber = tipc_ref_lock((u32)(unsigned long)usr_handle); |
b97bf3fd PL |
405 | if (subscriber == NULL) |
406 | return; | |
407 | ||
408 | subscriber_lock = subscriber->lock; | |
409 | subscr_terminate(subscriber); | |
410 | spin_unlock_bh(subscriber_lock); | |
411 | } | |
412 | ||
413 | /** | |
414 | * subscr_conn_msg_event - handle new subscription request from subscriber | |
415 | */ | |
416 | ||
417 | static void subscr_conn_msg_event(void *usr_handle, | |
418 | u32 port_ref, | |
419 | struct sk_buff **buf, | |
420 | const unchar *data, | |
421 | u32 size) | |
422 | { | |
880b005f | 423 | struct subscriber *subscriber; |
b97bf3fd PL |
424 | spinlock_t *subscriber_lock; |
425 | ||
4323add6 | 426 | subscriber = tipc_ref_lock((u32)(unsigned long)usr_handle); |
b97bf3fd PL |
427 | if (subscriber == NULL) |
428 | return; | |
429 | ||
430 | subscriber_lock = subscriber->lock; | |
431 | if (size != sizeof(struct tipc_subscr)) | |
432 | subscr_terminate(subscriber); | |
433 | else | |
434 | subscr_subscribe((struct tipc_subscr *)data, subscriber); | |
435 | ||
436 | spin_unlock_bh(subscriber_lock); | |
437 | } | |
438 | ||
439 | /** | |
440 | * subscr_named_msg_event - handle request to establish a new subscriber | |
441 | */ | |
442 | ||
443 | static void subscr_named_msg_event(void *usr_handle, | |
444 | u32 port_ref, | |
445 | struct sk_buff **buf, | |
446 | const unchar *data, | |
447 | u32 size, | |
448 | u32 importance, | |
449 | struct tipc_portid const *orig, | |
450 | struct tipc_name_seq const *dest) | |
451 | { | |
452 | struct subscriber *subscriber; | |
1fc54d8f | 453 | struct iovec msg_sect = {NULL, 0}; |
b97bf3fd PL |
454 | spinlock_t *subscriber_lock; |
455 | ||
456 | dbg("subscr_named_msg_event: orig = %x own = %x,\n", | |
457 | orig->node, tipc_own_addr); | |
458 | if (size && (size != sizeof(struct tipc_subscr))) { | |
a10bd924 | 459 | warn("Subscriber rejected, invalid subscription size\n"); |
b97bf3fd PL |
460 | return; |
461 | } | |
462 | ||
463 | /* Create subscriber object */ | |
464 | ||
0da974f4 | 465 | subscriber = kzalloc(sizeof(struct subscriber), GFP_ATOMIC); |
b97bf3fd | 466 | if (subscriber == NULL) { |
a10bd924 | 467 | warn("Subscriber rejected, no memory\n"); |
b97bf3fd PL |
468 | return; |
469 | } | |
b97bf3fd PL |
470 | INIT_LIST_HEAD(&subscriber->subscription_list); |
471 | INIT_LIST_HEAD(&subscriber->subscriber_list); | |
4323add6 | 472 | subscriber->ref = tipc_ref_acquire(subscriber, &subscriber->lock); |
b97bf3fd | 473 | if (subscriber->ref == 0) { |
a10bd924 | 474 | warn("Subscriber rejected, reference table exhausted\n"); |
b97bf3fd PL |
475 | kfree(subscriber); |
476 | return; | |
477 | } | |
478 | ||
479 | /* Establish a connection to subscriber */ | |
480 | ||
481 | tipc_createport(topsrv.user_ref, | |
880b005f | 482 | (void *)(unsigned long)subscriber->ref, |
b97bf3fd | 483 | importance, |
1fc54d8f SR |
484 | NULL, |
485 | NULL, | |
b97bf3fd | 486 | subscr_conn_shutdown_event, |
1fc54d8f SR |
487 | NULL, |
488 | NULL, | |
b97bf3fd | 489 | subscr_conn_msg_event, |
1fc54d8f | 490 | NULL, |
b97bf3fd PL |
491 | &subscriber->port_ref); |
492 | if (subscriber->port_ref == 0) { | |
a10bd924 | 493 | warn("Subscriber rejected, unable to create port\n"); |
4323add6 | 494 | tipc_ref_discard(subscriber->ref); |
b97bf3fd PL |
495 | kfree(subscriber); |
496 | return; | |
497 | } | |
498 | tipc_connect2port(subscriber->port_ref, orig); | |
499 | ||
500 | ||
501 | /* Add subscriber to topology server's subscriber list */ | |
502 | ||
4323add6 | 503 | tipc_ref_lock(subscriber->ref); |
b97bf3fd PL |
504 | spin_lock_bh(&topsrv.lock); |
505 | list_add(&subscriber->subscriber_list, &topsrv.subscriber_list); | |
506 | spin_unlock_bh(&topsrv.lock); | |
507 | ||
508 | /* | |
509 | * Subscribe now if message contains a subscription, | |
510 | * otherwise send an empty response to complete connection handshaking | |
511 | */ | |
512 | ||
513 | subscriber_lock = subscriber->lock; | |
514 | if (size) | |
515 | subscr_subscribe((struct tipc_subscr *)data, subscriber); | |
516 | else | |
517 | tipc_send(subscriber->port_ref, 1, &msg_sect); | |
518 | ||
519 | spin_unlock_bh(subscriber_lock); | |
520 | } | |
521 | ||
4323add6 | 522 | int tipc_subscr_start(void) |
b97bf3fd PL |
523 | { |
524 | struct tipc_name_seq seq = {TIPC_TOP_SRV, TIPC_TOP_SRV, TIPC_TOP_SRV}; | |
525 | int res = -1; | |
526 | ||
527 | memset(&topsrv, 0, sizeof (topsrv)); | |
34af946a | 528 | spin_lock_init(&topsrv.lock); |
b97bf3fd PL |
529 | INIT_LIST_HEAD(&topsrv.subscriber_list); |
530 | ||
531 | spin_lock_bh(&topsrv.lock); | |
1fc54d8f | 532 | res = tipc_attach(&topsrv.user_ref, NULL, NULL); |
b97bf3fd PL |
533 | if (res) { |
534 | spin_unlock_bh(&topsrv.lock); | |
535 | return res; | |
536 | } | |
537 | ||
538 | res = tipc_createport(topsrv.user_ref, | |
1fc54d8f | 539 | NULL, |
b97bf3fd | 540 | TIPC_CRITICAL_IMPORTANCE, |
1fc54d8f SR |
541 | NULL, |
542 | NULL, | |
543 | NULL, | |
544 | NULL, | |
b97bf3fd | 545 | subscr_named_msg_event, |
1fc54d8f SR |
546 | NULL, |
547 | NULL, | |
b97bf3fd PL |
548 | &topsrv.setup_port); |
549 | if (res) | |
550 | goto failed; | |
551 | ||
4323add6 | 552 | res = tipc_nametbl_publish_rsv(topsrv.setup_port, TIPC_NODE_SCOPE, &seq); |
b97bf3fd PL |
553 | if (res) |
554 | goto failed; | |
555 | ||
556 | spin_unlock_bh(&topsrv.lock); | |
557 | return 0; | |
558 | ||
559 | failed: | |
d0a14a9d | 560 | err("Failed to create subscription service\n"); |
b97bf3fd PL |
561 | tipc_detach(topsrv.user_ref); |
562 | topsrv.user_ref = 0; | |
563 | spin_unlock_bh(&topsrv.lock); | |
564 | return res; | |
565 | } | |
566 | ||
4323add6 | 567 | void tipc_subscr_stop(void) |
b97bf3fd PL |
568 | { |
569 | struct subscriber *subscriber; | |
570 | struct subscriber *subscriber_temp; | |
571 | spinlock_t *subscriber_lock; | |
572 | ||
573 | if (topsrv.user_ref) { | |
574 | tipc_deleteport(topsrv.setup_port); | |
575 | list_for_each_entry_safe(subscriber, subscriber_temp, | |
576 | &topsrv.subscriber_list, | |
577 | subscriber_list) { | |
4323add6 | 578 | tipc_ref_lock(subscriber->ref); |
b97bf3fd PL |
579 | subscriber_lock = subscriber->lock; |
580 | subscr_terminate(subscriber); | |
581 | spin_unlock_bh(subscriber_lock); | |
582 | } | |
583 | tipc_detach(topsrv.user_ref); | |
584 | topsrv.user_ref = 0; | |
585 | } | |
586 | } | |
587 | ||
588 | ||
589 | int tipc_ispublished(struct tipc_name const *name) | |
590 | { | |
591 | u32 domain = 0; | |
592 | ||
4323add6 | 593 | return(tipc_nametbl_translate(name->type, name->instance,&domain) != 0); |
b97bf3fd PL |
594 | } |
595 |