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Commit | Line | Data |
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b97bf3fd | 1 | /* |
5b06c85c | 2 | * net/tipc/subscr.c: TIPC network topology service |
c4307285 | 3 | * |
593a5f22 | 4 | * Copyright (c) 2000-2006, Ericsson AB |
23dd4cce | 5 | * Copyright (c) 2005-2007, 2010-2011, 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" | |
b97bf3fd | 38 | #include "name_table.h" |
aa70200e | 39 | #include "port.h" |
5b06c85c | 40 | #include "subscr.h" |
b97bf3fd PL |
41 | |
42 | /** | |
43 | * struct subscriber - TIPC network topology subscriber | |
28353e7f AS |
44 | * @port_ref: object reference to server port connecting to subscriber |
45 | * @lock: pointer to spinlock controlling access to subscriber's server port | |
b97bf3fd PL |
46 | * @subscriber_list: adjacent subscribers in top. server's list of subscribers |
47 | * @subscription_list: list of subscription objects for this subscriber | |
b97bf3fd | 48 | */ |
c4307285 | 49 | |
b97bf3fd | 50 | struct subscriber { |
28353e7f | 51 | u32 port_ref; |
c4307285 | 52 | spinlock_t *lock; |
b97bf3fd PL |
53 | struct list_head subscriber_list; |
54 | struct list_head subscription_list; | |
b97bf3fd PL |
55 | }; |
56 | ||
57 | /** | |
58 | * struct top_srv - TIPC network topology subscription service | |
59 | * @user_ref: TIPC userid of subscription service | |
60 | * @setup_port: reference to TIPC port that handles subscription requests | |
61 | * @subscription_count: number of active subscriptions (not subscribers!) | |
62 | * @subscriber_list: list of ports subscribing to service | |
63 | * @lock: spinlock govering access to subscriber list | |
64 | */ | |
65 | ||
66 | struct top_srv { | |
b97bf3fd PL |
67 | u32 setup_port; |
68 | atomic_t subscription_count; | |
69 | struct list_head subscriber_list; | |
70 | spinlock_t lock; | |
71 | }; | |
72 | ||
e3ec9c7d | 73 | static struct top_srv topsrv; |
b97bf3fd | 74 | |
db5a753b NH |
75 | /** |
76 | * htohl - convert value to endianness used by destination | |
77 | * @in: value to convert | |
78 | * @swap: non-zero if endianness must be reversed | |
79 | * | |
80 | * Returns converted value | |
81 | */ | |
82 | ||
83 | static u32 htohl(u32 in, int swap) | |
84 | { | |
85 | return swap ? swab32(in) : in; | |
86 | } | |
87 | ||
b97bf3fd PL |
88 | /** |
89 | * subscr_send_event - send a message containing a tipc_event to the subscriber | |
28353e7f AS |
90 | * |
91 | * Note: Must not hold subscriber's server port lock, since tipc_send() will | |
92 | * try to take the lock if the message is rejected and returned! | |
b97bf3fd PL |
93 | */ |
94 | ||
c4307285 YH |
95 | static void subscr_send_event(struct subscription *sub, |
96 | u32 found_lower, | |
b97bf3fd | 97 | u32 found_upper, |
c4307285 YH |
98 | u32 event, |
99 | u32 port_ref, | |
b97bf3fd PL |
100 | u32 node) |
101 | { | |
102 | struct iovec msg_sect; | |
103 | ||
104 | msg_sect.iov_base = (void *)&sub->evt; | |
105 | msg_sect.iov_len = sizeof(struct tipc_event); | |
106 | ||
db5a753b NH |
107 | sub->evt.event = htohl(event, sub->swap); |
108 | sub->evt.found_lower = htohl(found_lower, sub->swap); | |
109 | sub->evt.found_upper = htohl(found_upper, sub->swap); | |
110 | sub->evt.port.ref = htohl(port_ref, sub->swap); | |
111 | sub->evt.port.node = htohl(node, sub->swap); | |
28353e7f | 112 | tipc_send(sub->server_ref, 1, &msg_sect); |
b97bf3fd PL |
113 | } |
114 | ||
115 | /** | |
4323add6 | 116 | * tipc_subscr_overlap - test for subscription overlap with the given values |
b97bf3fd PL |
117 | * |
118 | * Returns 1 if there is overlap, otherwise 0. | |
119 | */ | |
120 | ||
c4307285 YH |
121 | int tipc_subscr_overlap(struct subscription *sub, |
122 | u32 found_lower, | |
4323add6 | 123 | u32 found_upper) |
b97bf3fd PL |
124 | |
125 | { | |
126 | if (found_lower < sub->seq.lower) | |
127 | found_lower = sub->seq.lower; | |
128 | if (found_upper > sub->seq.upper) | |
129 | found_upper = sub->seq.upper; | |
130 | if (found_lower > found_upper) | |
131 | return 0; | |
132 | return 1; | |
133 | } | |
134 | ||
135 | /** | |
4323add6 | 136 | * tipc_subscr_report_overlap - issue event if there is subscription overlap |
c4307285 | 137 | * |
b97bf3fd PL |
138 | * Protected by nameseq.lock in name_table.c |
139 | */ | |
140 | ||
c4307285 YH |
141 | void tipc_subscr_report_overlap(struct subscription *sub, |
142 | u32 found_lower, | |
4323add6 | 143 | u32 found_upper, |
c4307285 YH |
144 | u32 event, |
145 | u32 port_ref, | |
4323add6 PL |
146 | u32 node, |
147 | int must) | |
b97bf3fd | 148 | { |
4323add6 | 149 | if (!tipc_subscr_overlap(sub, found_lower, found_upper)) |
b97bf3fd | 150 | return; |
eb409460 | 151 | if (!must && !(sub->filter & TIPC_SUB_PORTS)) |
b97bf3fd | 152 | return; |
e15f8804 AS |
153 | |
154 | sub->event_cb(sub, found_lower, found_upper, event, port_ref, node); | |
b97bf3fd PL |
155 | } |
156 | ||
157 | /** | |
158 | * subscr_timeout - subscription timeout has occurred | |
159 | */ | |
160 | ||
161 | static void subscr_timeout(struct subscription *sub) | |
162 | { | |
23dd4cce | 163 | struct tipc_port *server_port; |
b97bf3fd | 164 | |
28353e7f | 165 | /* Validate server port reference (in case subscriber is terminating) */ |
b97bf3fd | 166 | |
28353e7f AS |
167 | server_port = tipc_port_lock(sub->server_ref); |
168 | if (server_port == NULL) | |
b97bf3fd PL |
169 | return; |
170 | ||
eb409460 LC |
171 | /* Validate timeout (in case subscription is being cancelled) */ |
172 | ||
173 | if (sub->timeout == TIPC_WAIT_FOREVER) { | |
28353e7f | 174 | tipc_port_unlock(server_port); |
eb409460 LC |
175 | return; |
176 | } | |
177 | ||
b97bf3fd PL |
178 | /* Unlink subscription from name table */ |
179 | ||
4323add6 | 180 | tipc_nametbl_unsubscribe(sub); |
b97bf3fd | 181 | |
28353e7f | 182 | /* Unlink subscription from subscriber */ |
b97bf3fd | 183 | |
b97bf3fd PL |
184 | list_del(&sub->subscription_list); |
185 | ||
28353e7f AS |
186 | /* Release subscriber's server port */ |
187 | ||
188 | tipc_port_unlock(server_port); | |
189 | ||
190 | /* Notify subscriber of timeout */ | |
191 | ||
192 | subscr_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper, | |
193 | TIPC_SUBSCR_TIMEOUT, 0, 0); | |
194 | ||
b97bf3fd PL |
195 | /* Now destroy subscription */ |
196 | ||
b97bf3fd PL |
197 | k_term_timer(&sub->timer); |
198 | kfree(sub); | |
199 | atomic_dec(&topsrv.subscription_count); | |
200 | } | |
201 | ||
eb409460 LC |
202 | /** |
203 | * subscr_del - delete a subscription within a subscription list | |
204 | * | |
28353e7f | 205 | * Called with subscriber port locked. |
eb409460 LC |
206 | */ |
207 | ||
208 | static void subscr_del(struct subscription *sub) | |
209 | { | |
210 | tipc_nametbl_unsubscribe(sub); | |
211 | list_del(&sub->subscription_list); | |
212 | kfree(sub); | |
213 | atomic_dec(&topsrv.subscription_count); | |
214 | } | |
215 | ||
b97bf3fd PL |
216 | /** |
217 | * subscr_terminate - terminate communication with a subscriber | |
c4307285 | 218 | * |
28353e7f | 219 | * Called with subscriber port locked. Routine must temporarily release lock |
c4307285 | 220 | * to enable subscription timeout routine(s) to finish without deadlocking; |
b97bf3fd | 221 | * the lock is then reclaimed to allow caller to release it upon return. |
c4307285 | 222 | * (This should work even in the unlikely event some other thread creates |
b97bf3fd PL |
223 | * a new object reference in the interim that uses this lock; this routine will |
224 | * simply wait for it to be released, then claim it.) | |
225 | */ | |
226 | ||
227 | static void subscr_terminate(struct subscriber *subscriber) | |
228 | { | |
28353e7f | 229 | u32 port_ref; |
b97bf3fd PL |
230 | struct subscription *sub; |
231 | struct subscription *sub_temp; | |
232 | ||
233 | /* Invalidate subscriber reference */ | |
234 | ||
28353e7f AS |
235 | port_ref = subscriber->port_ref; |
236 | subscriber->port_ref = 0; | |
b97bf3fd PL |
237 | spin_unlock_bh(subscriber->lock); |
238 | ||
28353e7f AS |
239 | /* Sever connection to subscriber */ |
240 | ||
241 | tipc_shutdown(port_ref); | |
242 | tipc_deleteport(port_ref); | |
243 | ||
b97bf3fd | 244 | /* Destroy any existing subscriptions for subscriber */ |
c4307285 | 245 | |
b97bf3fd PL |
246 | list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list, |
247 | subscription_list) { | |
248 | if (sub->timeout != TIPC_WAIT_FOREVER) { | |
249 | k_cancel_timer(&sub->timer); | |
250 | k_term_timer(&sub->timer); | |
251 | } | |
eb409460 | 252 | subscr_del(sub); |
b97bf3fd PL |
253 | } |
254 | ||
b97bf3fd PL |
255 | /* Remove subscriber from topology server's subscriber list */ |
256 | ||
257 | spin_lock_bh(&topsrv.lock); | |
258 | list_del(&subscriber->subscriber_list); | |
259 | spin_unlock_bh(&topsrv.lock); | |
260 | ||
28353e7f | 261 | /* Reclaim subscriber lock */ |
b97bf3fd PL |
262 | |
263 | spin_lock_bh(subscriber->lock); | |
28353e7f AS |
264 | |
265 | /* Now destroy subscriber */ | |
266 | ||
b97bf3fd PL |
267 | kfree(subscriber); |
268 | } | |
269 | ||
eb409460 LC |
270 | /** |
271 | * subscr_cancel - handle subscription cancellation request | |
272 | * | |
28353e7f | 273 | * Called with subscriber port locked. Routine must temporarily release lock |
eb409460 LC |
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) { | |
db5a753b NH |
291 | if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) { |
292 | found = 1; | |
293 | break; | |
294 | } | |
eb409460 LC |
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 | } | |
eb409460 LC |
308 | subscr_del(sub); |
309 | } | |
310 | ||
b97bf3fd PL |
311 | /** |
312 | * subscr_subscribe - create subscription for subscriber | |
c4307285 | 313 | * |
28353e7f | 314 | * Called with subscriber port locked. |
b97bf3fd PL |
315 | */ |
316 | ||
28353e7f AS |
317 | static struct subscription *subscr_subscribe(struct tipc_subscr *s, |
318 | struct subscriber *subscriber) | |
b97bf3fd PL |
319 | { |
320 | struct subscription *sub; | |
db5a753b NH |
321 | int swap; |
322 | ||
323 | /* Determine subscriber's endianness */ | |
324 | ||
325 | swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE)); | |
eb409460 LC |
326 | |
327 | /* Detect & process a subscription cancellation request */ | |
328 | ||
db5a753b NH |
329 | if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) { |
330 | s->filter &= ~htohl(TIPC_SUB_CANCEL, swap); | |
eb409460 | 331 | subscr_cancel(s, subscriber); |
28353e7f | 332 | return NULL; |
eb409460 LC |
333 | } |
334 | ||
b97bf3fd PL |
335 | /* Refuse subscription if global limit exceeded */ |
336 | ||
337 | if (atomic_read(&topsrv.subscription_count) >= tipc_max_subscriptions) { | |
a10bd924 AS |
338 | warn("Subscription rejected, subscription limit reached (%u)\n", |
339 | tipc_max_subscriptions); | |
b97bf3fd | 340 | subscr_terminate(subscriber); |
28353e7f | 341 | return NULL; |
b97bf3fd PL |
342 | } |
343 | ||
344 | /* Allocate subscription object */ | |
345 | ||
28353e7f | 346 | sub = kmalloc(sizeof(*sub), GFP_ATOMIC); |
a10bd924 AS |
347 | if (!sub) { |
348 | warn("Subscription rejected, no memory\n"); | |
b97bf3fd | 349 | subscr_terminate(subscriber); |
28353e7f | 350 | return NULL; |
b97bf3fd PL |
351 | } |
352 | ||
b97bf3fd PL |
353 | /* Initialize subscription object */ |
354 | ||
db5a753b NH |
355 | sub->seq.type = htohl(s->seq.type, swap); |
356 | sub->seq.lower = htohl(s->seq.lower, swap); | |
357 | sub->seq.upper = htohl(s->seq.upper, swap); | |
358 | sub->timeout = htohl(s->timeout, swap); | |
359 | sub->filter = htohl(s->filter, swap); | |
8c974438 NH |
360 | if ((!(sub->filter & TIPC_SUB_PORTS) == |
361 | !(sub->filter & TIPC_SUB_SERVICE)) || | |
f64f9e71 | 362 | (sub->seq.lower > sub->seq.upper)) { |
a10bd924 | 363 | warn("Subscription rejected, illegal request\n"); |
b97bf3fd PL |
364 | kfree(sub); |
365 | subscr_terminate(subscriber); | |
28353e7f | 366 | return NULL; |
b97bf3fd | 367 | } |
e15f8804 | 368 | sub->event_cb = subscr_send_event; |
b97bf3fd PL |
369 | INIT_LIST_HEAD(&sub->nameseq_list); |
370 | list_add(&sub->subscription_list, &subscriber->subscription_list); | |
28353e7f | 371 | sub->server_ref = subscriber->port_ref; |
db5a753b | 372 | sub->swap = swap; |
28353e7f | 373 | memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr)); |
b97bf3fd PL |
374 | atomic_inc(&topsrv.subscription_count); |
375 | if (sub->timeout != TIPC_WAIT_FOREVER) { | |
376 | k_init_timer(&sub->timer, | |
377 | (Handler)subscr_timeout, (unsigned long)sub); | |
378 | k_start_timer(&sub->timer, sub->timeout); | |
379 | } | |
28353e7f AS |
380 | |
381 | return sub; | |
b97bf3fd PL |
382 | } |
383 | ||
384 | /** | |
385 | * subscr_conn_shutdown_event - handle termination request from subscriber | |
28353e7f AS |
386 | * |
387 | * Called with subscriber's server port unlocked. | |
b97bf3fd PL |
388 | */ |
389 | ||
390 | static void subscr_conn_shutdown_event(void *usr_handle, | |
28353e7f | 391 | u32 port_ref, |
b97bf3fd PL |
392 | struct sk_buff **buf, |
393 | unsigned char const *data, | |
394 | unsigned int size, | |
395 | int reason) | |
396 | { | |
28353e7f | 397 | struct subscriber *subscriber = usr_handle; |
b97bf3fd PL |
398 | spinlock_t *subscriber_lock; |
399 | ||
28353e7f | 400 | if (tipc_port_lock(port_ref) == NULL) |
b97bf3fd PL |
401 | return; |
402 | ||
403 | subscriber_lock = subscriber->lock; | |
404 | subscr_terminate(subscriber); | |
405 | spin_unlock_bh(subscriber_lock); | |
406 | } | |
407 | ||
408 | /** | |
409 | * subscr_conn_msg_event - handle new subscription request from subscriber | |
28353e7f AS |
410 | * |
411 | * Called with subscriber's server port unlocked. | |
b97bf3fd PL |
412 | */ |
413 | ||
414 | static void subscr_conn_msg_event(void *usr_handle, | |
415 | u32 port_ref, | |
416 | struct sk_buff **buf, | |
417 | const unchar *data, | |
418 | u32 size) | |
419 | { | |
28353e7f | 420 | struct subscriber *subscriber = usr_handle; |
b97bf3fd | 421 | spinlock_t *subscriber_lock; |
28353e7f AS |
422 | struct subscription *sub; |
423 | ||
424 | /* | |
425 | * Lock subscriber's server port (& make a local copy of lock pointer, | |
426 | * in case subscriber is deleted while processing subscription request) | |
427 | */ | |
b97bf3fd | 428 | |
28353e7f | 429 | if (tipc_port_lock(port_ref) == NULL) |
b97bf3fd PL |
430 | return; |
431 | ||
432 | subscriber_lock = subscriber->lock; | |
c4307285 | 433 | |
28353e7f AS |
434 | if (size != sizeof(struct tipc_subscr)) { |
435 | subscr_terminate(subscriber); | |
436 | spin_unlock_bh(subscriber_lock); | |
437 | } else { | |
438 | sub = subscr_subscribe((struct tipc_subscr *)data, subscriber); | |
439 | spin_unlock_bh(subscriber_lock); | |
440 | if (sub != NULL) { | |
441 | ||
442 | /* | |
443 | * We must release the server port lock before adding a | |
444 | * subscription to the name table since TIPC needs to be | |
445 | * able to (re)acquire the port lock if an event message | |
446 | * issued by the subscription process is rejected and | |
447 | * returned. The subscription cannot be deleted while | |
448 | * it is being added to the name table because: | |
449 | * a) the single-threading of the native API port code | |
450 | * ensures the subscription cannot be cancelled and | |
451 | * the subscriber connection cannot be broken, and | |
452 | * b) the name table lock ensures the subscription | |
453 | * timeout code cannot delete the subscription, | |
454 | * so the subscription object is still protected. | |
455 | */ | |
456 | ||
457 | tipc_nametbl_subscribe(sub); | |
458 | } | |
459 | } | |
b97bf3fd PL |
460 | } |
461 | ||
462 | /** | |
463 | * subscr_named_msg_event - handle request to establish a new subscriber | |
464 | */ | |
465 | ||
466 | static void subscr_named_msg_event(void *usr_handle, | |
467 | u32 port_ref, | |
468 | struct sk_buff **buf, | |
469 | const unchar *data, | |
470 | u32 size, | |
c4307285 | 471 | u32 importance, |
b97bf3fd PL |
472 | struct tipc_portid const *orig, |
473 | struct tipc_name_seq const *dest) | |
474 | { | |
28353e7f AS |
475 | struct subscriber *subscriber; |
476 | u32 server_port_ref; | |
b97bf3fd PL |
477 | |
478 | /* Create subscriber object */ | |
479 | ||
0da974f4 | 480 | subscriber = kzalloc(sizeof(struct subscriber), GFP_ATOMIC); |
b97bf3fd | 481 | if (subscriber == NULL) { |
a10bd924 | 482 | warn("Subscriber rejected, no memory\n"); |
b97bf3fd PL |
483 | return; |
484 | } | |
b97bf3fd PL |
485 | INIT_LIST_HEAD(&subscriber->subscription_list); |
486 | INIT_LIST_HEAD(&subscriber->subscriber_list); | |
b97bf3fd | 487 | |
28353e7f | 488 | /* Create server port & establish connection to subscriber */ |
b97bf3fd | 489 | |
b0c1e928 | 490 | tipc_createport(subscriber, |
b97bf3fd | 491 | importance, |
1fc54d8f SR |
492 | NULL, |
493 | NULL, | |
b97bf3fd | 494 | subscr_conn_shutdown_event, |
1fc54d8f SR |
495 | NULL, |
496 | NULL, | |
b97bf3fd | 497 | subscr_conn_msg_event, |
1fc54d8f | 498 | NULL, |
b97bf3fd PL |
499 | &subscriber->port_ref); |
500 | if (subscriber->port_ref == 0) { | |
a10bd924 | 501 | warn("Subscriber rejected, unable to create port\n"); |
b97bf3fd PL |
502 | kfree(subscriber); |
503 | return; | |
504 | } | |
505 | tipc_connect2port(subscriber->port_ref, orig); | |
506 | ||
28353e7f AS |
507 | /* Lock server port (& save lock address for future use) */ |
508 | ||
23dd4cce | 509 | subscriber->lock = tipc_port_lock(subscriber->port_ref)->lock; |
b97bf3fd PL |
510 | |
511 | /* Add subscriber to topology server's subscriber list */ | |
512 | ||
b97bf3fd PL |
513 | spin_lock_bh(&topsrv.lock); |
514 | list_add(&subscriber->subscriber_list, &topsrv.subscriber_list); | |
515 | spin_unlock_bh(&topsrv.lock); | |
516 | ||
28353e7f | 517 | /* Unlock server port */ |
b97bf3fd | 518 | |
28353e7f AS |
519 | server_port_ref = subscriber->port_ref; |
520 | spin_unlock_bh(subscriber->lock); | |
b97bf3fd | 521 | |
28353e7f AS |
522 | /* Send an ACK- to complete connection handshaking */ |
523 | ||
69218fc4 | 524 | tipc_send(server_port_ref, 0, NULL); |
28353e7f AS |
525 | |
526 | /* Handle optional subscription request */ | |
527 | ||
528 | if (size != 0) { | |
529 | subscr_conn_msg_event(subscriber, server_port_ref, | |
530 | buf, data, size); | |
531 | } | |
b97bf3fd PL |
532 | } |
533 | ||
4323add6 | 534 | int tipc_subscr_start(void) |
b97bf3fd PL |
535 | { |
536 | struct tipc_name_seq seq = {TIPC_TOP_SRV, TIPC_TOP_SRV, TIPC_TOP_SRV}; | |
52fe7b72 | 537 | int res; |
b97bf3fd | 538 | |
0e65967e | 539 | memset(&topsrv, 0, sizeof(topsrv)); |
34af946a | 540 | spin_lock_init(&topsrv.lock); |
b97bf3fd PL |
541 | INIT_LIST_HEAD(&topsrv.subscriber_list); |
542 | ||
b0c1e928 | 543 | res = tipc_createport(NULL, |
c4307285 YH |
544 | TIPC_CRITICAL_IMPORTANCE, |
545 | NULL, | |
546 | NULL, | |
547 | NULL, | |
548 | NULL, | |
549 | subscr_named_msg_event, | |
550 | NULL, | |
551 | NULL, | |
552 | &topsrv.setup_port); | |
553 | if (res) | |
b97bf3fd PL |
554 | goto failed; |
555 | ||
c4307285 | 556 | res = tipc_nametbl_publish_rsv(topsrv.setup_port, TIPC_NODE_SCOPE, &seq); |
aa70200e AS |
557 | if (res) { |
558 | tipc_deleteport(topsrv.setup_port); | |
559 | topsrv.setup_port = 0; | |
b97bf3fd | 560 | goto failed; |
aa70200e | 561 | } |
b97bf3fd | 562 | |
b97bf3fd PL |
563 | return 0; |
564 | ||
565 | failed: | |
d0a14a9d | 566 | err("Failed to create subscription service\n"); |
b97bf3fd PL |
567 | return res; |
568 | } | |
569 | ||
4323add6 | 570 | void tipc_subscr_stop(void) |
b97bf3fd PL |
571 | { |
572 | struct subscriber *subscriber; | |
573 | struct subscriber *subscriber_temp; | |
574 | spinlock_t *subscriber_lock; | |
575 | ||
aa70200e | 576 | if (topsrv.setup_port) { |
b97bf3fd | 577 | tipc_deleteport(topsrv.setup_port); |
aa70200e AS |
578 | topsrv.setup_port = 0; |
579 | ||
c4307285 | 580 | list_for_each_entry_safe(subscriber, subscriber_temp, |
b97bf3fd PL |
581 | &topsrv.subscriber_list, |
582 | subscriber_list) { | |
b97bf3fd | 583 | subscriber_lock = subscriber->lock; |
28353e7f | 584 | spin_lock_bh(subscriber_lock); |
b97bf3fd PL |
585 | subscr_terminate(subscriber); |
586 | spin_unlock_bh(subscriber_lock); | |
587 | } | |
b97bf3fd PL |
588 | } |
589 | } |