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 | /** | |
11f99906 | 43 | * struct tipc_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 | */ |
11f99906 | 49 | struct tipc_subscriber { |
28353e7f | 50 | u32 port_ref; |
c4307285 | 51 | spinlock_t *lock; |
b97bf3fd PL |
52 | struct list_head subscriber_list; |
53 | struct list_head subscription_list; | |
b97bf3fd PL |
54 | }; |
55 | ||
56 | /** | |
57 | * struct top_srv - TIPC network topology subscription service | |
b97bf3fd PL |
58 | * @setup_port: reference to TIPC port that handles subscription requests |
59 | * @subscription_count: number of active subscriptions (not subscribers!) | |
60 | * @subscriber_list: list of ports subscribing to service | |
61 | * @lock: spinlock govering access to subscriber list | |
62 | */ | |
b97bf3fd | 63 | struct top_srv { |
b97bf3fd PL |
64 | u32 setup_port; |
65 | atomic_t subscription_count; | |
66 | struct list_head subscriber_list; | |
67 | spinlock_t lock; | |
68 | }; | |
69 | ||
e3ec9c7d | 70 | static struct top_srv topsrv; |
b97bf3fd | 71 | |
db5a753b NH |
72 | /** |
73 | * htohl - convert value to endianness used by destination | |
74 | * @in: value to convert | |
75 | * @swap: non-zero if endianness must be reversed | |
76 | * | |
77 | * Returns converted value | |
78 | */ | |
db5a753b NH |
79 | static u32 htohl(u32 in, int swap) |
80 | { | |
81 | return swap ? swab32(in) : in; | |
82 | } | |
83 | ||
b97bf3fd PL |
84 | /** |
85 | * subscr_send_event - send a message containing a tipc_event to the subscriber | |
28353e7f AS |
86 | * |
87 | * Note: Must not hold subscriber's server port lock, since tipc_send() will | |
88 | * try to take the lock if the message is rejected and returned! | |
b97bf3fd | 89 | */ |
fead3909 | 90 | static void subscr_send_event(struct tipc_subscription *sub, |
c4307285 | 91 | u32 found_lower, |
b97bf3fd | 92 | u32 found_upper, |
c4307285 YH |
93 | u32 event, |
94 | u32 port_ref, | |
b97bf3fd PL |
95 | u32 node) |
96 | { | |
97 | struct iovec msg_sect; | |
98 | ||
99 | msg_sect.iov_base = (void *)&sub->evt; | |
100 | msg_sect.iov_len = sizeof(struct tipc_event); | |
101 | ||
db5a753b NH |
102 | sub->evt.event = htohl(event, sub->swap); |
103 | sub->evt.found_lower = htohl(found_lower, sub->swap); | |
104 | sub->evt.found_upper = htohl(found_upper, sub->swap); | |
105 | sub->evt.port.ref = htohl(port_ref, sub->swap); | |
106 | sub->evt.port.node = htohl(node, sub->swap); | |
26896904 | 107 | tipc_send(sub->server_ref, 1, &msg_sect, msg_sect.iov_len); |
b97bf3fd PL |
108 | } |
109 | ||
110 | /** | |
4323add6 | 111 | * tipc_subscr_overlap - test for subscription overlap with the given values |
b97bf3fd PL |
112 | * |
113 | * Returns 1 if there is overlap, otherwise 0. | |
114 | */ | |
fead3909 | 115 | int tipc_subscr_overlap(struct tipc_subscription *sub, |
c4307285 | 116 | u32 found_lower, |
4323add6 | 117 | u32 found_upper) |
b97bf3fd PL |
118 | |
119 | { | |
120 | if (found_lower < sub->seq.lower) | |
121 | found_lower = sub->seq.lower; | |
122 | if (found_upper > sub->seq.upper) | |
123 | found_upper = sub->seq.upper; | |
124 | if (found_lower > found_upper) | |
125 | return 0; | |
126 | return 1; | |
127 | } | |
128 | ||
129 | /** | |
4323add6 | 130 | * tipc_subscr_report_overlap - issue event if there is subscription overlap |
c4307285 | 131 | * |
b97bf3fd PL |
132 | * Protected by nameseq.lock in name_table.c |
133 | */ | |
fead3909 | 134 | void tipc_subscr_report_overlap(struct tipc_subscription *sub, |
c4307285 | 135 | u32 found_lower, |
4323add6 | 136 | u32 found_upper, |
c4307285 YH |
137 | u32 event, |
138 | u32 port_ref, | |
4323add6 PL |
139 | u32 node, |
140 | int must) | |
b97bf3fd | 141 | { |
4323add6 | 142 | if (!tipc_subscr_overlap(sub, found_lower, found_upper)) |
b97bf3fd | 143 | return; |
eb409460 | 144 | if (!must && !(sub->filter & TIPC_SUB_PORTS)) |
b97bf3fd | 145 | return; |
e15f8804 | 146 | |
7e244776 | 147 | subscr_send_event(sub, found_lower, found_upper, event, port_ref, node); |
b97bf3fd PL |
148 | } |
149 | ||
150 | /** | |
151 | * subscr_timeout - subscription timeout has occurred | |
152 | */ | |
fead3909 | 153 | static void subscr_timeout(struct tipc_subscription *sub) |
b97bf3fd | 154 | { |
23dd4cce | 155 | struct tipc_port *server_port; |
b97bf3fd | 156 | |
28353e7f | 157 | /* Validate server port reference (in case subscriber is terminating) */ |
28353e7f AS |
158 | server_port = tipc_port_lock(sub->server_ref); |
159 | if (server_port == NULL) | |
b97bf3fd PL |
160 | return; |
161 | ||
eb409460 | 162 | /* Validate timeout (in case subscription is being cancelled) */ |
eb409460 | 163 | if (sub->timeout == TIPC_WAIT_FOREVER) { |
28353e7f | 164 | tipc_port_unlock(server_port); |
eb409460 LC |
165 | return; |
166 | } | |
167 | ||
b97bf3fd | 168 | /* Unlink subscription from name table */ |
4323add6 | 169 | tipc_nametbl_unsubscribe(sub); |
b97bf3fd | 170 | |
28353e7f | 171 | /* Unlink subscription from subscriber */ |
b97bf3fd PL |
172 | list_del(&sub->subscription_list); |
173 | ||
28353e7f | 174 | /* Release subscriber's server port */ |
28353e7f AS |
175 | tipc_port_unlock(server_port); |
176 | ||
177 | /* Notify subscriber of timeout */ | |
28353e7f AS |
178 | subscr_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper, |
179 | TIPC_SUBSCR_TIMEOUT, 0, 0); | |
180 | ||
b97bf3fd | 181 | /* Now destroy subscription */ |
b97bf3fd PL |
182 | k_term_timer(&sub->timer); |
183 | kfree(sub); | |
184 | atomic_dec(&topsrv.subscription_count); | |
185 | } | |
186 | ||
eb409460 LC |
187 | /** |
188 | * subscr_del - delete a subscription within a subscription list | |
189 | * | |
28353e7f | 190 | * Called with subscriber port locked. |
eb409460 | 191 | */ |
fead3909 | 192 | static void subscr_del(struct tipc_subscription *sub) |
eb409460 LC |
193 | { |
194 | tipc_nametbl_unsubscribe(sub); | |
195 | list_del(&sub->subscription_list); | |
196 | kfree(sub); | |
197 | atomic_dec(&topsrv.subscription_count); | |
198 | } | |
199 | ||
b97bf3fd PL |
200 | /** |
201 | * subscr_terminate - terminate communication with a subscriber | |
c4307285 | 202 | * |
28353e7f | 203 | * Called with subscriber port locked. Routine must temporarily release lock |
c4307285 | 204 | * to enable subscription timeout routine(s) to finish without deadlocking; |
b97bf3fd | 205 | * the lock is then reclaimed to allow caller to release it upon return. |
c4307285 | 206 | * (This should work even in the unlikely event some other thread creates |
b97bf3fd PL |
207 | * a new object reference in the interim that uses this lock; this routine will |
208 | * simply wait for it to be released, then claim it.) | |
209 | */ | |
11f99906 | 210 | static void subscr_terminate(struct tipc_subscriber *subscriber) |
b97bf3fd | 211 | { |
28353e7f | 212 | u32 port_ref; |
fead3909 PG |
213 | struct tipc_subscription *sub; |
214 | struct tipc_subscription *sub_temp; | |
b97bf3fd PL |
215 | |
216 | /* Invalidate subscriber reference */ | |
28353e7f AS |
217 | port_ref = subscriber->port_ref; |
218 | subscriber->port_ref = 0; | |
b97bf3fd PL |
219 | spin_unlock_bh(subscriber->lock); |
220 | ||
28353e7f | 221 | /* Sever connection to subscriber */ |
28353e7f AS |
222 | tipc_shutdown(port_ref); |
223 | tipc_deleteport(port_ref); | |
224 | ||
b97bf3fd | 225 | /* Destroy any existing subscriptions for subscriber */ |
b97bf3fd PL |
226 | list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list, |
227 | subscription_list) { | |
228 | if (sub->timeout != TIPC_WAIT_FOREVER) { | |
229 | k_cancel_timer(&sub->timer); | |
230 | k_term_timer(&sub->timer); | |
231 | } | |
eb409460 | 232 | subscr_del(sub); |
b97bf3fd PL |
233 | } |
234 | ||
b97bf3fd | 235 | /* Remove subscriber from topology server's subscriber list */ |
b97bf3fd PL |
236 | spin_lock_bh(&topsrv.lock); |
237 | list_del(&subscriber->subscriber_list); | |
238 | spin_unlock_bh(&topsrv.lock); | |
239 | ||
28353e7f | 240 | /* Reclaim subscriber lock */ |
b97bf3fd | 241 | spin_lock_bh(subscriber->lock); |
28353e7f AS |
242 | |
243 | /* Now destroy subscriber */ | |
b97bf3fd PL |
244 | kfree(subscriber); |
245 | } | |
246 | ||
eb409460 LC |
247 | /** |
248 | * subscr_cancel - handle subscription cancellation request | |
249 | * | |
28353e7f | 250 | * Called with subscriber port locked. Routine must temporarily release lock |
eb409460 LC |
251 | * to enable the subscription timeout routine to finish without deadlocking; |
252 | * the lock is then reclaimed to allow caller to release it upon return. | |
253 | * | |
254 | * Note that fields of 's' use subscriber's endianness! | |
255 | */ | |
eb409460 | 256 | static void subscr_cancel(struct tipc_subscr *s, |
11f99906 | 257 | struct tipc_subscriber *subscriber) |
eb409460 | 258 | { |
fead3909 PG |
259 | struct tipc_subscription *sub; |
260 | struct tipc_subscription *sub_temp; | |
eb409460 LC |
261 | int found = 0; |
262 | ||
263 | /* Find first matching subscription, exit if not found */ | |
eb409460 LC |
264 | list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list, |
265 | subscription_list) { | |
db5a753b NH |
266 | if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) { |
267 | found = 1; | |
268 | break; | |
269 | } | |
eb409460 LC |
270 | } |
271 | if (!found) | |
272 | return; | |
273 | ||
274 | /* Cancel subscription timer (if used), then delete subscription */ | |
eb409460 LC |
275 | if (sub->timeout != TIPC_WAIT_FOREVER) { |
276 | sub->timeout = TIPC_WAIT_FOREVER; | |
277 | spin_unlock_bh(subscriber->lock); | |
278 | k_cancel_timer(&sub->timer); | |
279 | k_term_timer(&sub->timer); | |
280 | spin_lock_bh(subscriber->lock); | |
281 | } | |
eb409460 LC |
282 | subscr_del(sub); |
283 | } | |
284 | ||
b97bf3fd PL |
285 | /** |
286 | * subscr_subscribe - create subscription for subscriber | |
c4307285 | 287 | * |
28353e7f | 288 | * Called with subscriber port locked. |
b97bf3fd | 289 | */ |
fead3909 | 290 | static struct tipc_subscription *subscr_subscribe(struct tipc_subscr *s, |
11f99906 | 291 | struct tipc_subscriber *subscriber) |
b97bf3fd | 292 | { |
fead3909 | 293 | struct tipc_subscription *sub; |
db5a753b NH |
294 | int swap; |
295 | ||
296 | /* Determine subscriber's endianness */ | |
db5a753b | 297 | swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE)); |
eb409460 LC |
298 | |
299 | /* Detect & process a subscription cancellation request */ | |
db5a753b NH |
300 | if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) { |
301 | s->filter &= ~htohl(TIPC_SUB_CANCEL, swap); | |
eb409460 | 302 | subscr_cancel(s, subscriber); |
28353e7f | 303 | return NULL; |
eb409460 LC |
304 | } |
305 | ||
b97bf3fd | 306 | /* Refuse subscription if global limit exceeded */ |
34f256cc | 307 | if (atomic_read(&topsrv.subscription_count) >= TIPC_MAX_SUBSCRIPTIONS) { |
2cf8aa19 | 308 | pr_warn("Subscription rejected, limit reached (%u)\n", |
34f256cc | 309 | TIPC_MAX_SUBSCRIPTIONS); |
b97bf3fd | 310 | subscr_terminate(subscriber); |
28353e7f | 311 | return NULL; |
b97bf3fd PL |
312 | } |
313 | ||
314 | /* Allocate subscription object */ | |
28353e7f | 315 | sub = kmalloc(sizeof(*sub), GFP_ATOMIC); |
a10bd924 | 316 | if (!sub) { |
2cf8aa19 | 317 | pr_warn("Subscription rejected, no memory\n"); |
b97bf3fd | 318 | subscr_terminate(subscriber); |
28353e7f | 319 | return NULL; |
b97bf3fd PL |
320 | } |
321 | ||
b97bf3fd | 322 | /* Initialize subscription object */ |
db5a753b NH |
323 | sub->seq.type = htohl(s->seq.type, swap); |
324 | sub->seq.lower = htohl(s->seq.lower, swap); | |
325 | sub->seq.upper = htohl(s->seq.upper, swap); | |
326 | sub->timeout = htohl(s->timeout, swap); | |
327 | sub->filter = htohl(s->filter, swap); | |
8c974438 NH |
328 | if ((!(sub->filter & TIPC_SUB_PORTS) == |
329 | !(sub->filter & TIPC_SUB_SERVICE)) || | |
f64f9e71 | 330 | (sub->seq.lower > sub->seq.upper)) { |
2cf8aa19 | 331 | pr_warn("Subscription rejected, illegal request\n"); |
b97bf3fd PL |
332 | kfree(sub); |
333 | subscr_terminate(subscriber); | |
28353e7f | 334 | return NULL; |
b97bf3fd | 335 | } |
b97bf3fd PL |
336 | INIT_LIST_HEAD(&sub->nameseq_list); |
337 | list_add(&sub->subscription_list, &subscriber->subscription_list); | |
28353e7f | 338 | sub->server_ref = subscriber->port_ref; |
db5a753b | 339 | sub->swap = swap; |
28353e7f | 340 | memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr)); |
b97bf3fd PL |
341 | atomic_inc(&topsrv.subscription_count); |
342 | if (sub->timeout != TIPC_WAIT_FOREVER) { | |
343 | k_init_timer(&sub->timer, | |
344 | (Handler)subscr_timeout, (unsigned long)sub); | |
345 | k_start_timer(&sub->timer, sub->timeout); | |
346 | } | |
28353e7f AS |
347 | |
348 | return sub; | |
b97bf3fd PL |
349 | } |
350 | ||
351 | /** | |
352 | * subscr_conn_shutdown_event - handle termination request from subscriber | |
28353e7f AS |
353 | * |
354 | * Called with subscriber's server port unlocked. | |
b97bf3fd | 355 | */ |
b97bf3fd | 356 | static void subscr_conn_shutdown_event(void *usr_handle, |
28353e7f | 357 | u32 port_ref, |
b97bf3fd PL |
358 | struct sk_buff **buf, |
359 | unsigned char const *data, | |
360 | unsigned int size, | |
361 | int reason) | |
362 | { | |
11f99906 | 363 | struct tipc_subscriber *subscriber = usr_handle; |
b97bf3fd PL |
364 | spinlock_t *subscriber_lock; |
365 | ||
28353e7f | 366 | if (tipc_port_lock(port_ref) == NULL) |
b97bf3fd PL |
367 | return; |
368 | ||
369 | subscriber_lock = subscriber->lock; | |
370 | subscr_terminate(subscriber); | |
371 | spin_unlock_bh(subscriber_lock); | |
372 | } | |
373 | ||
374 | /** | |
375 | * subscr_conn_msg_event - handle new subscription request from subscriber | |
28353e7f AS |
376 | * |
377 | * Called with subscriber's server port unlocked. | |
b97bf3fd | 378 | */ |
b97bf3fd PL |
379 | static void subscr_conn_msg_event(void *usr_handle, |
380 | u32 port_ref, | |
381 | struct sk_buff **buf, | |
382 | const unchar *data, | |
383 | u32 size) | |
384 | { | |
11f99906 | 385 | struct tipc_subscriber *subscriber = usr_handle; |
b97bf3fd | 386 | spinlock_t *subscriber_lock; |
fead3909 | 387 | struct tipc_subscription *sub; |
28353e7f AS |
388 | |
389 | /* | |
390 | * Lock subscriber's server port (& make a local copy of lock pointer, | |
391 | * in case subscriber is deleted while processing subscription request) | |
392 | */ | |
28353e7f | 393 | if (tipc_port_lock(port_ref) == NULL) |
b97bf3fd PL |
394 | return; |
395 | ||
396 | subscriber_lock = subscriber->lock; | |
c4307285 | 397 | |
28353e7f AS |
398 | if (size != sizeof(struct tipc_subscr)) { |
399 | subscr_terminate(subscriber); | |
400 | spin_unlock_bh(subscriber_lock); | |
401 | } else { | |
402 | sub = subscr_subscribe((struct tipc_subscr *)data, subscriber); | |
403 | spin_unlock_bh(subscriber_lock); | |
404 | if (sub != NULL) { | |
405 | ||
406 | /* | |
407 | * We must release the server port lock before adding a | |
408 | * subscription to the name table since TIPC needs to be | |
409 | * able to (re)acquire the port lock if an event message | |
410 | * issued by the subscription process is rejected and | |
411 | * returned. The subscription cannot be deleted while | |
412 | * it is being added to the name table because: | |
413 | * a) the single-threading of the native API port code | |
414 | * ensures the subscription cannot be cancelled and | |
415 | * the subscriber connection cannot be broken, and | |
416 | * b) the name table lock ensures the subscription | |
417 | * timeout code cannot delete the subscription, | |
418 | * so the subscription object is still protected. | |
419 | */ | |
28353e7f AS |
420 | tipc_nametbl_subscribe(sub); |
421 | } | |
422 | } | |
b97bf3fd PL |
423 | } |
424 | ||
425 | /** | |
426 | * subscr_named_msg_event - handle request to establish a new subscriber | |
427 | */ | |
b97bf3fd PL |
428 | static void subscr_named_msg_event(void *usr_handle, |
429 | u32 port_ref, | |
430 | struct sk_buff **buf, | |
431 | const unchar *data, | |
432 | u32 size, | |
c4307285 | 433 | u32 importance, |
b97bf3fd PL |
434 | struct tipc_portid const *orig, |
435 | struct tipc_name_seq const *dest) | |
436 | { | |
11f99906 | 437 | struct tipc_subscriber *subscriber; |
28353e7f | 438 | u32 server_port_ref; |
b97bf3fd PL |
439 | |
440 | /* Create subscriber object */ | |
11f99906 | 441 | subscriber = kzalloc(sizeof(struct tipc_subscriber), GFP_ATOMIC); |
b97bf3fd | 442 | if (subscriber == NULL) { |
2cf8aa19 | 443 | pr_warn("Subscriber rejected, no memory\n"); |
b97bf3fd PL |
444 | return; |
445 | } | |
b97bf3fd PL |
446 | INIT_LIST_HEAD(&subscriber->subscription_list); |
447 | INIT_LIST_HEAD(&subscriber->subscriber_list); | |
b97bf3fd | 448 | |
28353e7f | 449 | /* Create server port & establish connection to subscriber */ |
b0c1e928 | 450 | tipc_createport(subscriber, |
b97bf3fd | 451 | importance, |
1fc54d8f SR |
452 | NULL, |
453 | NULL, | |
b97bf3fd | 454 | subscr_conn_shutdown_event, |
1fc54d8f SR |
455 | NULL, |
456 | NULL, | |
b97bf3fd | 457 | subscr_conn_msg_event, |
1fc54d8f | 458 | NULL, |
b97bf3fd PL |
459 | &subscriber->port_ref); |
460 | if (subscriber->port_ref == 0) { | |
2cf8aa19 | 461 | pr_warn("Subscriber rejected, unable to create port\n"); |
b97bf3fd PL |
462 | kfree(subscriber); |
463 | return; | |
464 | } | |
bc879117 | 465 | tipc_connect(subscriber->port_ref, orig); |
b97bf3fd | 466 | |
28353e7f | 467 | /* Lock server port (& save lock address for future use) */ |
23dd4cce | 468 | subscriber->lock = tipc_port_lock(subscriber->port_ref)->lock; |
b97bf3fd PL |
469 | |
470 | /* Add subscriber to topology server's subscriber list */ | |
b97bf3fd PL |
471 | spin_lock_bh(&topsrv.lock); |
472 | list_add(&subscriber->subscriber_list, &topsrv.subscriber_list); | |
473 | spin_unlock_bh(&topsrv.lock); | |
474 | ||
28353e7f | 475 | /* Unlock server port */ |
28353e7f AS |
476 | server_port_ref = subscriber->port_ref; |
477 | spin_unlock_bh(subscriber->lock); | |
b97bf3fd | 478 | |
28353e7f | 479 | /* Send an ACK- to complete connection handshaking */ |
26896904 | 480 | tipc_send(server_port_ref, 0, NULL, 0); |
28353e7f AS |
481 | |
482 | /* Handle optional subscription request */ | |
28353e7f AS |
483 | if (size != 0) { |
484 | subscr_conn_msg_event(subscriber, server_port_ref, | |
485 | buf, data, size); | |
486 | } | |
b97bf3fd PL |
487 | } |
488 | ||
4323add6 | 489 | int tipc_subscr_start(void) |
b97bf3fd PL |
490 | { |
491 | struct tipc_name_seq seq = {TIPC_TOP_SRV, TIPC_TOP_SRV, TIPC_TOP_SRV}; | |
52fe7b72 | 492 | int res; |
b97bf3fd | 493 | |
34af946a | 494 | spin_lock_init(&topsrv.lock); |
b97bf3fd PL |
495 | INIT_LIST_HEAD(&topsrv.subscriber_list); |
496 | ||
b0c1e928 | 497 | res = tipc_createport(NULL, |
c4307285 YH |
498 | TIPC_CRITICAL_IMPORTANCE, |
499 | NULL, | |
500 | NULL, | |
501 | NULL, | |
502 | NULL, | |
503 | subscr_named_msg_event, | |
504 | NULL, | |
505 | NULL, | |
506 | &topsrv.setup_port); | |
507 | if (res) | |
b97bf3fd PL |
508 | goto failed; |
509 | ||
c422f1bd | 510 | res = tipc_publish(topsrv.setup_port, TIPC_NODE_SCOPE, &seq); |
aa70200e AS |
511 | if (res) { |
512 | tipc_deleteport(topsrv.setup_port); | |
513 | topsrv.setup_port = 0; | |
b97bf3fd | 514 | goto failed; |
aa70200e | 515 | } |
b97bf3fd | 516 | |
b97bf3fd PL |
517 | return 0; |
518 | ||
519 | failed: | |
2cf8aa19 | 520 | pr_err("Failed to create subscription service\n"); |
b97bf3fd PL |
521 | return res; |
522 | } | |
523 | ||
4323add6 | 524 | void tipc_subscr_stop(void) |
b97bf3fd | 525 | { |
11f99906 PG |
526 | struct tipc_subscriber *subscriber; |
527 | struct tipc_subscriber *subscriber_temp; | |
b97bf3fd PL |
528 | spinlock_t *subscriber_lock; |
529 | ||
aa70200e | 530 | if (topsrv.setup_port) { |
b97bf3fd | 531 | tipc_deleteport(topsrv.setup_port); |
aa70200e AS |
532 | topsrv.setup_port = 0; |
533 | ||
c4307285 | 534 | list_for_each_entry_safe(subscriber, subscriber_temp, |
b97bf3fd PL |
535 | &topsrv.subscriber_list, |
536 | subscriber_list) { | |
b97bf3fd | 537 | subscriber_lock = subscriber->lock; |
28353e7f | 538 | spin_lock_bh(subscriber_lock); |
b97bf3fd PL |
539 | subscr_terminate(subscriber); |
540 | spin_unlock_bh(subscriber_lock); | |
541 | } | |
b97bf3fd PL |
542 | } |
543 | } |