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 |
5b06c85c | 5 | * Copyright (c) 2005-2007, 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" | |
b97bf3fd | 39 | #include "name_table.h" |
28353e7f | 40 | #include "port.h" |
b97bf3fd | 41 | #include "ref.h" |
5b06c85c | 42 | #include "subscr.h" |
b97bf3fd PL |
43 | |
44 | /** | |
45 | * struct subscriber - TIPC network topology subscriber | |
28353e7f AS |
46 | * @port_ref: object reference to server port connecting to subscriber |
47 | * @lock: pointer to spinlock controlling access to subscriber's server port | |
b97bf3fd PL |
48 | * @subscriber_list: adjacent subscribers in top. server's list of subscribers |
49 | * @subscription_list: list of subscription objects for this subscriber | |
b97bf3fd | 50 | */ |
c4307285 | 51 | |
b97bf3fd | 52 | struct subscriber { |
28353e7f | 53 | u32 port_ref; |
c4307285 | 54 | spinlock_t *lock; |
b97bf3fd PL |
55 | struct list_head subscriber_list; |
56 | struct list_head subscription_list; | |
b97bf3fd PL |
57 | }; |
58 | ||
59 | /** | |
60 | * struct top_srv - TIPC network topology subscription service | |
61 | * @user_ref: TIPC userid of subscription service | |
62 | * @setup_port: reference to TIPC port that handles subscription requests | |
63 | * @subscription_count: number of active subscriptions (not subscribers!) | |
64 | * @subscriber_list: list of ports subscribing to service | |
65 | * @lock: spinlock govering access to subscriber list | |
66 | */ | |
67 | ||
68 | struct top_srv { | |
69 | u32 user_ref; | |
70 | u32 setup_port; | |
71 | atomic_t subscription_count; | |
72 | struct list_head subscriber_list; | |
73 | spinlock_t lock; | |
74 | }; | |
75 | ||
76 | static struct top_srv topsrv = { 0 }; | |
77 | ||
b97bf3fd PL |
78 | /** |
79 | * subscr_send_event - send a message containing a tipc_event to the subscriber | |
28353e7f AS |
80 | * |
81 | * Note: Must not hold subscriber's server port lock, since tipc_send() will | |
82 | * try to take the lock if the message is rejected and returned! | |
b97bf3fd PL |
83 | */ |
84 | ||
c4307285 YH |
85 | static void subscr_send_event(struct subscription *sub, |
86 | u32 found_lower, | |
b97bf3fd | 87 | u32 found_upper, |
c4307285 YH |
88 | u32 event, |
89 | u32 port_ref, | |
b97bf3fd PL |
90 | u32 node) |
91 | { | |
92 | struct iovec msg_sect; | |
93 | ||
94 | msg_sect.iov_base = (void *)&sub->evt; | |
95 | msg_sect.iov_len = sizeof(struct tipc_event); | |
96 | ||
d88dca79 NH |
97 | sub->evt.event = htonl(event); |
98 | sub->evt.found_lower = htonl(found_lower); | |
99 | sub->evt.found_upper = htonl(found_upper); | |
100 | sub->evt.port.ref = htonl(port_ref); | |
101 | sub->evt.port.node = htonl(node); | |
28353e7f | 102 | tipc_send(sub->server_ref, 1, &msg_sect); |
b97bf3fd PL |
103 | } |
104 | ||
105 | /** | |
4323add6 | 106 | * tipc_subscr_overlap - test for subscription overlap with the given values |
b97bf3fd PL |
107 | * |
108 | * Returns 1 if there is overlap, otherwise 0. | |
109 | */ | |
110 | ||
c4307285 YH |
111 | int tipc_subscr_overlap(struct subscription *sub, |
112 | u32 found_lower, | |
4323add6 | 113 | u32 found_upper) |
b97bf3fd PL |
114 | |
115 | { | |
116 | if (found_lower < sub->seq.lower) | |
117 | found_lower = sub->seq.lower; | |
118 | if (found_upper > sub->seq.upper) | |
119 | found_upper = sub->seq.upper; | |
120 | if (found_lower > found_upper) | |
121 | return 0; | |
122 | return 1; | |
123 | } | |
124 | ||
125 | /** | |
4323add6 | 126 | * tipc_subscr_report_overlap - issue event if there is subscription overlap |
c4307285 | 127 | * |
b97bf3fd PL |
128 | * Protected by nameseq.lock in name_table.c |
129 | */ | |
130 | ||
c4307285 YH |
131 | void tipc_subscr_report_overlap(struct subscription *sub, |
132 | u32 found_lower, | |
4323add6 | 133 | u32 found_upper, |
c4307285 YH |
134 | u32 event, |
135 | u32 port_ref, | |
4323add6 PL |
136 | u32 node, |
137 | int must) | |
b97bf3fd | 138 | { |
4323add6 | 139 | if (!tipc_subscr_overlap(sub, found_lower, found_upper)) |
b97bf3fd | 140 | return; |
eb409460 | 141 | if (!must && !(sub->filter & TIPC_SUB_PORTS)) |
b97bf3fd | 142 | return; |
e15f8804 AS |
143 | |
144 | sub->event_cb(sub, found_lower, found_upper, event, port_ref, node); | |
b97bf3fd PL |
145 | } |
146 | ||
147 | /** | |
148 | * subscr_timeout - subscription timeout has occurred | |
149 | */ | |
150 | ||
151 | static void subscr_timeout(struct subscription *sub) | |
152 | { | |
28353e7f | 153 | struct port *server_port; |
b97bf3fd | 154 | |
28353e7f | 155 | /* Validate server port reference (in case subscriber is terminating) */ |
b97bf3fd | 156 | |
28353e7f AS |
157 | server_port = tipc_port_lock(sub->server_ref); |
158 | if (server_port == NULL) | |
b97bf3fd PL |
159 | return; |
160 | ||
eb409460 LC |
161 | /* Validate timeout (in case subscription is being cancelled) */ |
162 | ||
163 | if (sub->timeout == TIPC_WAIT_FOREVER) { | |
28353e7f | 164 | tipc_port_unlock(server_port); |
eb409460 LC |
165 | return; |
166 | } | |
167 | ||
b97bf3fd PL |
168 | /* Unlink subscription from name table */ |
169 | ||
4323add6 | 170 | tipc_nametbl_unsubscribe(sub); |
b97bf3fd | 171 | |
28353e7f | 172 | /* Unlink subscription from subscriber */ |
b97bf3fd | 173 | |
b97bf3fd PL |
174 | list_del(&sub->subscription_list); |
175 | ||
28353e7f AS |
176 | /* Release subscriber's server port */ |
177 | ||
178 | tipc_port_unlock(server_port); | |
179 | ||
180 | /* Notify subscriber of timeout */ | |
181 | ||
182 | subscr_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper, | |
183 | TIPC_SUBSCR_TIMEOUT, 0, 0); | |
184 | ||
b97bf3fd PL |
185 | /* Now destroy subscription */ |
186 | ||
b97bf3fd PL |
187 | k_term_timer(&sub->timer); |
188 | kfree(sub); | |
189 | atomic_dec(&topsrv.subscription_count); | |
190 | } | |
191 | ||
eb409460 LC |
192 | /** |
193 | * subscr_del - delete a subscription within a subscription list | |
194 | * | |
28353e7f | 195 | * Called with subscriber port locked. |
eb409460 LC |
196 | */ |
197 | ||
198 | static void subscr_del(struct subscription *sub) | |
199 | { | |
200 | tipc_nametbl_unsubscribe(sub); | |
201 | list_del(&sub->subscription_list); | |
202 | kfree(sub); | |
203 | atomic_dec(&topsrv.subscription_count); | |
204 | } | |
205 | ||
b97bf3fd PL |
206 | /** |
207 | * subscr_terminate - terminate communication with a subscriber | |
c4307285 | 208 | * |
28353e7f | 209 | * Called with subscriber port locked. Routine must temporarily release lock |
c4307285 | 210 | * to enable subscription timeout routine(s) to finish without deadlocking; |
b97bf3fd | 211 | * the lock is then reclaimed to allow caller to release it upon return. |
c4307285 | 212 | * (This should work even in the unlikely event some other thread creates |
b97bf3fd PL |
213 | * a new object reference in the interim that uses this lock; this routine will |
214 | * simply wait for it to be released, then claim it.) | |
215 | */ | |
216 | ||
217 | static void subscr_terminate(struct subscriber *subscriber) | |
218 | { | |
28353e7f | 219 | u32 port_ref; |
b97bf3fd PL |
220 | struct subscription *sub; |
221 | struct subscription *sub_temp; | |
222 | ||
223 | /* Invalidate subscriber reference */ | |
224 | ||
28353e7f AS |
225 | port_ref = subscriber->port_ref; |
226 | subscriber->port_ref = 0; | |
b97bf3fd PL |
227 | spin_unlock_bh(subscriber->lock); |
228 | ||
28353e7f AS |
229 | /* Sever connection to subscriber */ |
230 | ||
231 | tipc_shutdown(port_ref); | |
232 | tipc_deleteport(port_ref); | |
233 | ||
b97bf3fd | 234 | /* Destroy any existing subscriptions for subscriber */ |
c4307285 | 235 | |
b97bf3fd PL |
236 | list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list, |
237 | subscription_list) { | |
238 | if (sub->timeout != TIPC_WAIT_FOREVER) { | |
239 | k_cancel_timer(&sub->timer); | |
240 | k_term_timer(&sub->timer); | |
241 | } | |
eb409460 | 242 | dbg("Term: Removing sub %u,%u,%u from subscriber %x list\n", |
b97bf3fd | 243 | sub->seq.type, sub->seq.lower, sub->seq.upper, subscriber); |
eb409460 | 244 | subscr_del(sub); |
b97bf3fd PL |
245 | } |
246 | ||
b97bf3fd PL |
247 | /* Remove subscriber from topology server's subscriber list */ |
248 | ||
249 | spin_lock_bh(&topsrv.lock); | |
250 | list_del(&subscriber->subscriber_list); | |
251 | spin_unlock_bh(&topsrv.lock); | |
252 | ||
28353e7f | 253 | /* Reclaim subscriber lock */ |
b97bf3fd PL |
254 | |
255 | spin_lock_bh(subscriber->lock); | |
28353e7f AS |
256 | |
257 | /* Now destroy subscriber */ | |
258 | ||
b97bf3fd PL |
259 | kfree(subscriber); |
260 | } | |
261 | ||
eb409460 LC |
262 | /** |
263 | * subscr_cancel - handle subscription cancellation request | |
264 | * | |
28353e7f | 265 | * Called with subscriber port locked. Routine must temporarily release lock |
eb409460 LC |
266 | * to enable the subscription timeout routine to finish without deadlocking; |
267 | * the lock is then reclaimed to allow caller to release it upon return. | |
268 | * | |
269 | * Note that fields of 's' use subscriber's endianness! | |
270 | */ | |
271 | ||
272 | static void subscr_cancel(struct tipc_subscr *s, | |
273 | struct subscriber *subscriber) | |
274 | { | |
275 | struct subscription *sub; | |
276 | struct subscription *sub_temp; | |
8c974438 | 277 | __u32 type, lower, upper; |
eb409460 LC |
278 | int found = 0; |
279 | ||
280 | /* Find first matching subscription, exit if not found */ | |
281 | ||
d88dca79 NH |
282 | type = ntohl(s->seq.type); |
283 | lower = ntohl(s->seq.lower); | |
284 | upper = ntohl(s->seq.upper); | |
285 | ||
eb409460 LC |
286 | list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list, |
287 | subscription_list) { | |
d88dca79 NH |
288 | if ((type == sub->seq.type) && |
289 | (lower == sub->seq.lower) && | |
8c974438 | 290 | (upper == sub->seq.upper)) { |
d88dca79 NH |
291 | found = 1; |
292 | break; | |
293 | } | |
eb409460 LC |
294 | } |
295 | if (!found) | |
296 | return; | |
297 | ||
298 | /* Cancel subscription timer (if used), then delete subscription */ | |
299 | ||
300 | if (sub->timeout != TIPC_WAIT_FOREVER) { | |
301 | sub->timeout = TIPC_WAIT_FOREVER; | |
302 | spin_unlock_bh(subscriber->lock); | |
303 | k_cancel_timer(&sub->timer); | |
304 | k_term_timer(&sub->timer); | |
305 | spin_lock_bh(subscriber->lock); | |
306 | } | |
8c974438 | 307 | dbg("Cancel: removing sub %u,%u,%u from subscriber %x list\n", |
eb409460 LC |
308 | sub->seq.type, sub->seq.lower, sub->seq.upper, subscriber); |
309 | subscr_del(sub); | |
310 | } | |
311 | ||
b97bf3fd PL |
312 | /** |
313 | * subscr_subscribe - create subscription for subscriber | |
c4307285 | 314 | * |
28353e7f | 315 | * Called with subscriber port locked. |
b97bf3fd PL |
316 | */ |
317 | ||
28353e7f AS |
318 | static struct subscription *subscr_subscribe(struct tipc_subscr *s, |
319 | struct subscriber *subscriber) | |
b97bf3fd PL |
320 | { |
321 | struct subscription *sub; | |
eb409460 LC |
322 | |
323 | /* Detect & process a subscription cancellation request */ | |
324 | ||
d88dca79 | 325 | if (ntohl(s->filter) & TIPC_SUB_CANCEL) { |
eb409460 | 326 | subscr_cancel(s, subscriber); |
28353e7f | 327 | return NULL; |
eb409460 LC |
328 | } |
329 | ||
b97bf3fd PL |
330 | /* Refuse subscription if global limit exceeded */ |
331 | ||
332 | if (atomic_read(&topsrv.subscription_count) >= tipc_max_subscriptions) { | |
a10bd924 AS |
333 | warn("Subscription rejected, subscription limit reached (%u)\n", |
334 | tipc_max_subscriptions); | |
b97bf3fd | 335 | subscr_terminate(subscriber); |
28353e7f | 336 | return NULL; |
b97bf3fd PL |
337 | } |
338 | ||
339 | /* Allocate subscription object */ | |
340 | ||
28353e7f | 341 | sub = kmalloc(sizeof(*sub), GFP_ATOMIC); |
a10bd924 AS |
342 | if (!sub) { |
343 | warn("Subscription rejected, no memory\n"); | |
b97bf3fd | 344 | subscr_terminate(subscriber); |
28353e7f | 345 | return NULL; |
b97bf3fd PL |
346 | } |
347 | ||
b97bf3fd PL |
348 | /* Initialize subscription object */ |
349 | ||
d88dca79 NH |
350 | sub->seq.type = ntohl(s->seq.type); |
351 | sub->seq.lower = ntohl(s->seq.lower); | |
352 | sub->seq.upper = ntohl(s->seq.upper); | |
353 | sub->timeout = ntohl(s->timeout); | |
354 | sub->filter = ntohl(s->filter); | |
8c974438 NH |
355 | if ((!(sub->filter & TIPC_SUB_PORTS) == |
356 | !(sub->filter & TIPC_SUB_SERVICE)) || | |
f64f9e71 | 357 | (sub->seq.lower > sub->seq.upper)) { |
a10bd924 | 358 | warn("Subscription rejected, illegal request\n"); |
b97bf3fd PL |
359 | kfree(sub); |
360 | subscr_terminate(subscriber); | |
28353e7f | 361 | return NULL; |
b97bf3fd | 362 | } |
e15f8804 | 363 | sub->event_cb = subscr_send_event; |
b97bf3fd PL |
364 | INIT_LIST_HEAD(&sub->nameseq_list); |
365 | list_add(&sub->subscription_list, &subscriber->subscription_list); | |
28353e7f | 366 | sub->server_ref = subscriber->port_ref; |
28353e7f | 367 | memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr)); |
b97bf3fd PL |
368 | atomic_inc(&topsrv.subscription_count); |
369 | if (sub->timeout != TIPC_WAIT_FOREVER) { | |
370 | k_init_timer(&sub->timer, | |
371 | (Handler)subscr_timeout, (unsigned long)sub); | |
372 | k_start_timer(&sub->timer, sub->timeout); | |
373 | } | |
28353e7f AS |
374 | |
375 | return sub; | |
b97bf3fd PL |
376 | } |
377 | ||
378 | /** | |
379 | * subscr_conn_shutdown_event - handle termination request from subscriber | |
28353e7f AS |
380 | * |
381 | * Called with subscriber's server port unlocked. | |
b97bf3fd PL |
382 | */ |
383 | ||
384 | static void subscr_conn_shutdown_event(void *usr_handle, | |
28353e7f | 385 | u32 port_ref, |
b97bf3fd PL |
386 | struct sk_buff **buf, |
387 | unsigned char const *data, | |
388 | unsigned int size, | |
389 | int reason) | |
390 | { | |
28353e7f | 391 | struct subscriber *subscriber = usr_handle; |
b97bf3fd PL |
392 | spinlock_t *subscriber_lock; |
393 | ||
28353e7f | 394 | if (tipc_port_lock(port_ref) == NULL) |
b97bf3fd PL |
395 | return; |
396 | ||
397 | subscriber_lock = subscriber->lock; | |
398 | subscr_terminate(subscriber); | |
399 | spin_unlock_bh(subscriber_lock); | |
400 | } | |
401 | ||
402 | /** | |
403 | * subscr_conn_msg_event - handle new subscription request from subscriber | |
28353e7f AS |
404 | * |
405 | * Called with subscriber's server port unlocked. | |
b97bf3fd PL |
406 | */ |
407 | ||
408 | static void subscr_conn_msg_event(void *usr_handle, | |
409 | u32 port_ref, | |
410 | struct sk_buff **buf, | |
411 | const unchar *data, | |
412 | u32 size) | |
413 | { | |
28353e7f | 414 | struct subscriber *subscriber = usr_handle; |
b97bf3fd | 415 | spinlock_t *subscriber_lock; |
28353e7f AS |
416 | struct subscription *sub; |
417 | ||
418 | /* | |
419 | * Lock subscriber's server port (& make a local copy of lock pointer, | |
420 | * in case subscriber is deleted while processing subscription request) | |
421 | */ | |
b97bf3fd | 422 | |
28353e7f | 423 | if (tipc_port_lock(port_ref) == NULL) |
b97bf3fd PL |
424 | return; |
425 | ||
426 | subscriber_lock = subscriber->lock; | |
c4307285 | 427 | |
28353e7f AS |
428 | if (size != sizeof(struct tipc_subscr)) { |
429 | subscr_terminate(subscriber); | |
430 | spin_unlock_bh(subscriber_lock); | |
431 | } else { | |
432 | sub = subscr_subscribe((struct tipc_subscr *)data, subscriber); | |
433 | spin_unlock_bh(subscriber_lock); | |
434 | if (sub != NULL) { | |
435 | ||
436 | /* | |
437 | * We must release the server port lock before adding a | |
438 | * subscription to the name table since TIPC needs to be | |
439 | * able to (re)acquire the port lock if an event message | |
440 | * issued by the subscription process is rejected and | |
441 | * returned. The subscription cannot be deleted while | |
442 | * it is being added to the name table because: | |
443 | * a) the single-threading of the native API port code | |
444 | * ensures the subscription cannot be cancelled and | |
445 | * the subscriber connection cannot be broken, and | |
446 | * b) the name table lock ensures the subscription | |
447 | * timeout code cannot delete the subscription, | |
448 | * so the subscription object is still protected. | |
449 | */ | |
450 | ||
451 | tipc_nametbl_subscribe(sub); | |
452 | } | |
453 | } | |
b97bf3fd PL |
454 | } |
455 | ||
456 | /** | |
457 | * subscr_named_msg_event - handle request to establish a new subscriber | |
458 | */ | |
459 | ||
460 | static void subscr_named_msg_event(void *usr_handle, | |
461 | u32 port_ref, | |
462 | struct sk_buff **buf, | |
463 | const unchar *data, | |
464 | u32 size, | |
c4307285 | 465 | u32 importance, |
b97bf3fd PL |
466 | struct tipc_portid const *orig, |
467 | struct tipc_name_seq const *dest) | |
468 | { | |
28353e7f | 469 | static struct iovec msg_sect = {NULL, 0}; |
b97bf3fd | 470 | |
28353e7f AS |
471 | struct subscriber *subscriber; |
472 | u32 server_port_ref; | |
b97bf3fd PL |
473 | |
474 | /* Create subscriber object */ | |
475 | ||
0da974f4 | 476 | subscriber = kzalloc(sizeof(struct subscriber), GFP_ATOMIC); |
b97bf3fd | 477 | if (subscriber == NULL) { |
a10bd924 | 478 | warn("Subscriber rejected, no memory\n"); |
b97bf3fd PL |
479 | return; |
480 | } | |
b97bf3fd PL |
481 | INIT_LIST_HEAD(&subscriber->subscription_list); |
482 | INIT_LIST_HEAD(&subscriber->subscriber_list); | |
b97bf3fd | 483 | |
28353e7f | 484 | /* Create server port & establish connection to subscriber */ |
b97bf3fd PL |
485 | |
486 | tipc_createport(topsrv.user_ref, | |
28353e7f | 487 | subscriber, |
b97bf3fd | 488 | importance, |
1fc54d8f SR |
489 | NULL, |
490 | NULL, | |
b97bf3fd | 491 | subscr_conn_shutdown_event, |
1fc54d8f SR |
492 | NULL, |
493 | NULL, | |
b97bf3fd | 494 | subscr_conn_msg_event, |
1fc54d8f | 495 | NULL, |
b97bf3fd PL |
496 | &subscriber->port_ref); |
497 | if (subscriber->port_ref == 0) { | |
a10bd924 | 498 | warn("Subscriber rejected, unable to create port\n"); |
b97bf3fd PL |
499 | kfree(subscriber); |
500 | return; | |
501 | } | |
502 | tipc_connect2port(subscriber->port_ref, orig); | |
503 | ||
28353e7f AS |
504 | /* Lock server port (& save lock address for future use) */ |
505 | ||
506 | subscriber->lock = tipc_port_lock(subscriber->port_ref)->publ.lock; | |
b97bf3fd PL |
507 | |
508 | /* Add subscriber to topology server's subscriber list */ | |
509 | ||
b97bf3fd PL |
510 | spin_lock_bh(&topsrv.lock); |
511 | list_add(&subscriber->subscriber_list, &topsrv.subscriber_list); | |
512 | spin_unlock_bh(&topsrv.lock); | |
513 | ||
28353e7f | 514 | /* Unlock server port */ |
b97bf3fd | 515 | |
28353e7f AS |
516 | server_port_ref = subscriber->port_ref; |
517 | spin_unlock_bh(subscriber->lock); | |
b97bf3fd | 518 | |
28353e7f AS |
519 | /* Send an ACK- to complete connection handshaking */ |
520 | ||
521 | tipc_send(server_port_ref, 1, &msg_sect); | |
522 | ||
523 | /* Handle optional subscription request */ | |
524 | ||
525 | if (size != 0) { | |
526 | subscr_conn_msg_event(subscriber, server_port_ref, | |
527 | buf, data, size); | |
528 | } | |
b97bf3fd PL |
529 | } |
530 | ||
4323add6 | 531 | int tipc_subscr_start(void) |
b97bf3fd PL |
532 | { |
533 | struct tipc_name_seq seq = {TIPC_TOP_SRV, TIPC_TOP_SRV, TIPC_TOP_SRV}; | |
534 | int res = -1; | |
535 | ||
536 | memset(&topsrv, 0, sizeof (topsrv)); | |
34af946a | 537 | spin_lock_init(&topsrv.lock); |
b97bf3fd PL |
538 | INIT_LIST_HEAD(&topsrv.subscriber_list); |
539 | ||
540 | spin_lock_bh(&topsrv.lock); | |
1fc54d8f | 541 | res = tipc_attach(&topsrv.user_ref, NULL, NULL); |
b97bf3fd PL |
542 | if (res) { |
543 | spin_unlock_bh(&topsrv.lock); | |
544 | return res; | |
545 | } | |
546 | ||
c4307285 YH |
547 | res = tipc_createport(topsrv.user_ref, |
548 | NULL, | |
549 | TIPC_CRITICAL_IMPORTANCE, | |
550 | NULL, | |
551 | NULL, | |
552 | NULL, | |
553 | NULL, | |
554 | subscr_named_msg_event, | |
555 | NULL, | |
556 | NULL, | |
557 | &topsrv.setup_port); | |
558 | if (res) | |
b97bf3fd PL |
559 | goto failed; |
560 | ||
c4307285 YH |
561 | res = tipc_nametbl_publish_rsv(topsrv.setup_port, TIPC_NODE_SCOPE, &seq); |
562 | if (res) | |
b97bf3fd PL |
563 | goto failed; |
564 | ||
565 | spin_unlock_bh(&topsrv.lock); | |
566 | return 0; | |
567 | ||
568 | failed: | |
d0a14a9d | 569 | err("Failed to create subscription service\n"); |
b97bf3fd PL |
570 | tipc_detach(topsrv.user_ref); |
571 | topsrv.user_ref = 0; | |
572 | spin_unlock_bh(&topsrv.lock); | |
573 | return res; | |
574 | } | |
575 | ||
4323add6 | 576 | void tipc_subscr_stop(void) |
b97bf3fd PL |
577 | { |
578 | struct subscriber *subscriber; | |
579 | struct subscriber *subscriber_temp; | |
580 | spinlock_t *subscriber_lock; | |
581 | ||
582 | if (topsrv.user_ref) { | |
583 | tipc_deleteport(topsrv.setup_port); | |
c4307285 | 584 | list_for_each_entry_safe(subscriber, subscriber_temp, |
b97bf3fd PL |
585 | &topsrv.subscriber_list, |
586 | subscriber_list) { | |
b97bf3fd | 587 | subscriber_lock = subscriber->lock; |
28353e7f | 588 | spin_lock_bh(subscriber_lock); |
b97bf3fd PL |
589 | subscr_terminate(subscriber); |
590 | spin_unlock_bh(subscriber_lock); | |
591 | } | |
592 | tipc_detach(topsrv.user_ref); | |
593 | topsrv.user_ref = 0; | |
594 | } | |
595 | } | |
596 | ||
597 | ||
598 | int tipc_ispublished(struct tipc_name const *name) | |
599 | { | |
600 | u32 domain = 0; | |
601 | ||
4323add6 | 602 | return(tipc_nametbl_translate(name->type, name->instance,&domain) != 0); |
b97bf3fd PL |
603 | } |
604 |