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Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
Allan Stephens5b06c85c2008-05-19 13:30:13 -07002 * net/tipc/subscr.c: TIPC network topology service
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Per Liden593a5f22006-01-11 19:14:19 +01004 * Copyright (c) 2000-2006, Ericsson AB
Allan Stephens5b06c85c2008-05-19 13:30:13 -07005 * Copyright (c) 2005-2007, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 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.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * 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
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010038#include "name_table.h"
Allan Stephensaa702002010-12-31 18:59:21 +000039#include "port.h"
Allan Stephens5b06c85c2008-05-19 13:30:13 -070040#include "subscr.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010041
42/**
43 * struct subscriber - TIPC network topology subscriber
Allan Stephens28353e72008-05-19 13:29:47 -070044 * @port_ref: object reference to server port connecting to subscriber
45 * @lock: pointer to spinlock controlling access to subscriber's server port
Per Lidenb97bf3f2006-01-02 19:04:38 +010046 * @subscriber_list: adjacent subscribers in top. server's list of subscribers
47 * @subscription_list: list of subscription objects for this subscriber
Per Lidenb97bf3f2006-01-02 19:04:38 +010048 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090049
Per Lidenb97bf3f2006-01-02 19:04:38 +010050struct subscriber {
Allan Stephens28353e72008-05-19 13:29:47 -070051 u32 port_ref;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090052 spinlock_t *lock;
Per Lidenb97bf3f2006-01-02 19:04:38 +010053 struct list_head subscriber_list;
54 struct list_head subscription_list;
Per Lidenb97bf3f2006-01-02 19:04:38 +010055};
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
66struct top_srv {
Per Lidenb97bf3f2006-01-02 19:04:38 +010067 u32 setup_port;
68 atomic_t subscription_count;
69 struct list_head subscriber_list;
70 spinlock_t lock;
71};
72
Allan Stephense3ec9c72010-12-31 18:59:34 +000073static struct top_srv topsrv;
Per Lidenb97bf3f2006-01-02 19:04:38 +010074
75/**
Neil Hormandb5a7532010-10-21 01:06:16 +000076 * 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
83static u32 htohl(u32 in, int swap)
84{
85 return swap ? swab32(in) : in;
86}
87
88/**
Per Lidenb97bf3f2006-01-02 19:04:38 +010089 * subscr_send_event - send a message containing a tipc_event to the subscriber
Allan Stephens28353e72008-05-19 13:29:47 -070090 *
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!
Per Lidenb97bf3f2006-01-02 19:04:38 +010093 */
94
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090095static void subscr_send_event(struct subscription *sub,
96 u32 found_lower,
Per Lidenb97bf3f2006-01-02 19:04:38 +010097 u32 found_upper,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090098 u32 event,
99 u32 port_ref,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100100 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
Neil Hormandb5a7532010-10-21 01:06:16 +0000107 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);
Allan Stephens28353e72008-05-19 13:29:47 -0700112 tipc_send(sub->server_ref, 1, &msg_sect);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100113}
114
115/**
Per Liden4323add2006-01-18 00:38:21 +0100116 * tipc_subscr_overlap - test for subscription overlap with the given values
Per Lidenb97bf3f2006-01-02 19:04:38 +0100117 *
118 * Returns 1 if there is overlap, otherwise 0.
119 */
120
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900121int tipc_subscr_overlap(struct subscription *sub,
122 u32 found_lower,
Per Liden4323add2006-01-18 00:38:21 +0100123 u32 found_upper)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100124
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/**
Per Liden4323add2006-01-18 00:38:21 +0100136 * tipc_subscr_report_overlap - issue event if there is subscription overlap
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900137 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100138 * Protected by nameseq.lock in name_table.c
139 */
140
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900141void tipc_subscr_report_overlap(struct subscription *sub,
142 u32 found_lower,
Per Liden4323add2006-01-18 00:38:21 +0100143 u32 found_upper,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900144 u32 event,
145 u32 port_ref,
Per Liden4323add2006-01-18 00:38:21 +0100146 u32 node,
147 int must)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100148{
Per Liden4323add2006-01-18 00:38:21 +0100149 if (!tipc_subscr_overlap(sub, found_lower, found_upper))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100150 return;
Lijun Cheneb409462006-10-16 21:59:42 -0700151 if (!must && !(sub->filter & TIPC_SUB_PORTS))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100152 return;
Allan Stephense15f8802008-05-19 13:27:31 -0700153
154 sub->event_cb(sub, found_lower, found_upper, event, port_ref, node);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100155}
156
157/**
158 * subscr_timeout - subscription timeout has occurred
159 */
160
161static void subscr_timeout(struct subscription *sub)
162{
Allan Stephens28353e72008-05-19 13:29:47 -0700163 struct port *server_port;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100164
Allan Stephens28353e72008-05-19 13:29:47 -0700165 /* Validate server port reference (in case subscriber is terminating) */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100166
Allan Stephens28353e72008-05-19 13:29:47 -0700167 server_port = tipc_port_lock(sub->server_ref);
168 if (server_port == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100169 return;
170
Lijun Cheneb409462006-10-16 21:59:42 -0700171 /* Validate timeout (in case subscription is being cancelled) */
172
173 if (sub->timeout == TIPC_WAIT_FOREVER) {
Allan Stephens28353e72008-05-19 13:29:47 -0700174 tipc_port_unlock(server_port);
Lijun Cheneb409462006-10-16 21:59:42 -0700175 return;
176 }
177
Per Lidenb97bf3f2006-01-02 19:04:38 +0100178 /* Unlink subscription from name table */
179
Per Liden4323add2006-01-18 00:38:21 +0100180 tipc_nametbl_unsubscribe(sub);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100181
Allan Stephens28353e72008-05-19 13:29:47 -0700182 /* Unlink subscription from subscriber */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100183
Per Lidenb97bf3f2006-01-02 19:04:38 +0100184 list_del(&sub->subscription_list);
185
Allan Stephens28353e72008-05-19 13:29:47 -0700186 /* 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
Per Lidenb97bf3f2006-01-02 19:04:38 +0100195 /* Now destroy subscription */
196
Per Lidenb97bf3f2006-01-02 19:04:38 +0100197 k_term_timer(&sub->timer);
198 kfree(sub);
199 atomic_dec(&topsrv.subscription_count);
200}
201
202/**
Lijun Cheneb409462006-10-16 21:59:42 -0700203 * subscr_del - delete a subscription within a subscription list
204 *
Allan Stephens28353e72008-05-19 13:29:47 -0700205 * Called with subscriber port locked.
Lijun Cheneb409462006-10-16 21:59:42 -0700206 */
207
208static 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
216/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100217 * subscr_terminate - terminate communication with a subscriber
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900218 *
Allan Stephens28353e72008-05-19 13:29:47 -0700219 * Called with subscriber port locked. Routine must temporarily release lock
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900220 * to enable subscription timeout routine(s) to finish without deadlocking;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100221 * the lock is then reclaimed to allow caller to release it upon return.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900222 * (This should work even in the unlikely event some other thread creates
Per Lidenb97bf3f2006-01-02 19:04:38 +0100223 * 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
227static void subscr_terminate(struct subscriber *subscriber)
228{
Allan Stephens28353e72008-05-19 13:29:47 -0700229 u32 port_ref;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100230 struct subscription *sub;
231 struct subscription *sub_temp;
232
233 /* Invalidate subscriber reference */
234
Allan Stephens28353e72008-05-19 13:29:47 -0700235 port_ref = subscriber->port_ref;
236 subscriber->port_ref = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100237 spin_unlock_bh(subscriber->lock);
238
Allan Stephens28353e72008-05-19 13:29:47 -0700239 /* Sever connection to subscriber */
240
241 tipc_shutdown(port_ref);
242 tipc_deleteport(port_ref);
243
Per Lidenb97bf3f2006-01-02 19:04:38 +0100244 /* Destroy any existing subscriptions for subscriber */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900245
Per Lidenb97bf3f2006-01-02 19:04:38 +0100246 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 }
Lijun Cheneb409462006-10-16 21:59:42 -0700252 subscr_del(sub);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100253 }
254
Per Lidenb97bf3f2006-01-02 19:04:38 +0100255 /* 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
Allan Stephens28353e72008-05-19 13:29:47 -0700261 /* Reclaim subscriber lock */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100262
263 spin_lock_bh(subscriber->lock);
Allan Stephens28353e72008-05-19 13:29:47 -0700264
265 /* Now destroy subscriber */
266
Per Lidenb97bf3f2006-01-02 19:04:38 +0100267 kfree(subscriber);
268}
269
270/**
Lijun Cheneb409462006-10-16 21:59:42 -0700271 * subscr_cancel - handle subscription cancellation request
272 *
Allan Stephens28353e72008-05-19 13:29:47 -0700273 * Called with subscriber port locked. Routine must temporarily release lock
Lijun Cheneb409462006-10-16 21:59:42 -0700274 * 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
280static 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) {
Neil Hormandb5a7532010-10-21 01:06:16 +0000291 if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) {
292 found = 1;
293 break;
294 }
Lijun Cheneb409462006-10-16 21:59:42 -0700295 }
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 }
Lijun Cheneb409462006-10-16 21:59:42 -0700308 subscr_del(sub);
309}
310
311/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100312 * subscr_subscribe - create subscription for subscriber
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900313 *
Allan Stephens28353e72008-05-19 13:29:47 -0700314 * Called with subscriber port locked.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100315 */
316
Allan Stephens28353e72008-05-19 13:29:47 -0700317static struct subscription *subscr_subscribe(struct tipc_subscr *s,
318 struct subscriber *subscriber)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100319{
320 struct subscription *sub;
Neil Hormandb5a7532010-10-21 01:06:16 +0000321 int swap;
322
323 /* Determine subscriber's endianness */
324
325 swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE));
Lijun Cheneb409462006-10-16 21:59:42 -0700326
327 /* Detect & process a subscription cancellation request */
328
Neil Hormandb5a7532010-10-21 01:06:16 +0000329 if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) {
330 s->filter &= ~htohl(TIPC_SUB_CANCEL, swap);
Lijun Cheneb409462006-10-16 21:59:42 -0700331 subscr_cancel(s, subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700332 return NULL;
Lijun Cheneb409462006-10-16 21:59:42 -0700333 }
334
Per Lidenb97bf3f2006-01-02 19:04:38 +0100335 /* Refuse subscription if global limit exceeded */
336
337 if (atomic_read(&topsrv.subscription_count) >= tipc_max_subscriptions) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700338 warn("Subscription rejected, subscription limit reached (%u)\n",
339 tipc_max_subscriptions);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100340 subscr_terminate(subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700341 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100342 }
343
344 /* Allocate subscription object */
345
Allan Stephens28353e72008-05-19 13:29:47 -0700346 sub = kmalloc(sizeof(*sub), GFP_ATOMIC);
Allan Stephensa10bd922006-06-25 23:52:17 -0700347 if (!sub) {
348 warn("Subscription rejected, no memory\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100349 subscr_terminate(subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700350 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100351 }
352
Per Lidenb97bf3f2006-01-02 19:04:38 +0100353 /* Initialize subscription object */
354
Neil Hormandb5a7532010-10-21 01:06:16 +0000355 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);
Neil Horman8c974432010-10-21 01:06:15 +0000360 if ((!(sub->filter & TIPC_SUB_PORTS) ==
361 !(sub->filter & TIPC_SUB_SERVICE)) ||
Joe Perchesf64f9e72009-11-29 16:55:45 -0800362 (sub->seq.lower > sub->seq.upper)) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700363 warn("Subscription rejected, illegal request\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100364 kfree(sub);
365 subscr_terminate(subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700366 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100367 }
Allan Stephense15f8802008-05-19 13:27:31 -0700368 sub->event_cb = subscr_send_event;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100369 INIT_LIST_HEAD(&sub->nameseq_list);
370 list_add(&sub->subscription_list, &subscriber->subscription_list);
Allan Stephens28353e72008-05-19 13:29:47 -0700371 sub->server_ref = subscriber->port_ref;
Neil Hormandb5a7532010-10-21 01:06:16 +0000372 sub->swap = swap;
Allan Stephens28353e72008-05-19 13:29:47 -0700373 memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100374 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 }
Allan Stephens28353e72008-05-19 13:29:47 -0700380
381 return sub;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100382}
383
384/**
385 * subscr_conn_shutdown_event - handle termination request from subscriber
Allan Stephens28353e72008-05-19 13:29:47 -0700386 *
387 * Called with subscriber's server port unlocked.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100388 */
389
390static void subscr_conn_shutdown_event(void *usr_handle,
Allan Stephens28353e72008-05-19 13:29:47 -0700391 u32 port_ref,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100392 struct sk_buff **buf,
393 unsigned char const *data,
394 unsigned int size,
395 int reason)
396{
Allan Stephens28353e72008-05-19 13:29:47 -0700397 struct subscriber *subscriber = usr_handle;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100398 spinlock_t *subscriber_lock;
399
Allan Stephens28353e72008-05-19 13:29:47 -0700400 if (tipc_port_lock(port_ref) == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100401 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
Allan Stephens28353e72008-05-19 13:29:47 -0700410 *
411 * Called with subscriber's server port unlocked.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100412 */
413
414static 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{
Allan Stephens28353e72008-05-19 13:29:47 -0700420 struct subscriber *subscriber = usr_handle;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100421 spinlock_t *subscriber_lock;
Allan Stephens28353e72008-05-19 13:29:47 -0700422 struct subscription *sub;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100423
Allan Stephens28353e72008-05-19 13:29:47 -0700424 /*
425 * Lock subscriber's server port (& make a local copy of lock pointer,
426 * in case subscriber is deleted while processing subscription request)
427 */
428
429 if (tipc_port_lock(port_ref) == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100430 return;
431
432 subscriber_lock = subscriber->lock;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900433
Allan Stephens28353e72008-05-19 13:29:47 -0700434 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 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100460}
461
462/**
463 * subscr_named_msg_event - handle request to establish a new subscriber
464 */
465
466static void subscr_named_msg_event(void *usr_handle,
467 u32 port_ref,
468 struct sk_buff **buf,
469 const unchar *data,
470 u32 size,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900471 u32 importance,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100472 struct tipc_portid const *orig,
473 struct tipc_name_seq const *dest)
474{
Allan Stephens28353e72008-05-19 13:29:47 -0700475 static struct iovec msg_sect = {NULL, 0};
Per Lidenb97bf3f2006-01-02 19:04:38 +0100476
Allan Stephens28353e72008-05-19 13:29:47 -0700477 struct subscriber *subscriber;
478 u32 server_port_ref;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100479
480 /* Create subscriber object */
481
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700482 subscriber = kzalloc(sizeof(struct subscriber), GFP_ATOMIC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100483 if (subscriber == NULL) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700484 warn("Subscriber rejected, no memory\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100485 return;
486 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100487 INIT_LIST_HEAD(&subscriber->subscription_list);
488 INIT_LIST_HEAD(&subscriber->subscriber_list);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100489
Allan Stephens28353e72008-05-19 13:29:47 -0700490 /* Create server port & establish connection to subscriber */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100491
Allan Stephensb0c1e922010-12-31 18:59:22 +0000492 tipc_createport(subscriber,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100493 importance,
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800494 NULL,
495 NULL,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100496 subscr_conn_shutdown_event,
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800497 NULL,
498 NULL,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100499 subscr_conn_msg_event,
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800500 NULL,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100501 &subscriber->port_ref);
502 if (subscriber->port_ref == 0) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700503 warn("Subscriber rejected, unable to create port\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100504 kfree(subscriber);
505 return;
506 }
507 tipc_connect2port(subscriber->port_ref, orig);
508
Allan Stephens28353e72008-05-19 13:29:47 -0700509 /* Lock server port (& save lock address for future use) */
510
511 subscriber->lock = tipc_port_lock(subscriber->port_ref)->publ.lock;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100512
513 /* Add subscriber to topology server's subscriber list */
514
Per Lidenb97bf3f2006-01-02 19:04:38 +0100515 spin_lock_bh(&topsrv.lock);
516 list_add(&subscriber->subscriber_list, &topsrv.subscriber_list);
517 spin_unlock_bh(&topsrv.lock);
518
Allan Stephens28353e72008-05-19 13:29:47 -0700519 /* Unlock server port */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100520
Allan Stephens28353e72008-05-19 13:29:47 -0700521 server_port_ref = subscriber->port_ref;
522 spin_unlock_bh(subscriber->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100523
Allan Stephens28353e72008-05-19 13:29:47 -0700524 /* Send an ACK- to complete connection handshaking */
525
526 tipc_send(server_port_ref, 1, &msg_sect);
527
528 /* Handle optional subscription request */
529
530 if (size != 0) {
531 subscr_conn_msg_event(subscriber, server_port_ref,
532 buf, data, size);
533 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100534}
535
Per Liden4323add2006-01-18 00:38:21 +0100536int tipc_subscr_start(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100537{
538 struct tipc_name_seq seq = {TIPC_TOP_SRV, TIPC_TOP_SRV, TIPC_TOP_SRV};
Allan Stephens52fe7b72010-11-30 12:01:00 +0000539 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100540
Allan Stephens0e659672010-12-31 18:59:32 +0000541 memset(&topsrv, 0, sizeof(topsrv));
Ingo Molnar34af9462006-06-27 02:53:55 -0700542 spin_lock_init(&topsrv.lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100543 INIT_LIST_HEAD(&topsrv.subscriber_list);
544
545 spin_lock_bh(&topsrv.lock);
Allan Stephensb0c1e922010-12-31 18:59:22 +0000546 res = tipc_createport(NULL,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900547 TIPC_CRITICAL_IMPORTANCE,
548 NULL,
549 NULL,
550 NULL,
551 NULL,
552 subscr_named_msg_event,
553 NULL,
554 NULL,
555 &topsrv.setup_port);
556 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100557 goto failed;
558
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900559 res = tipc_nametbl_publish_rsv(topsrv.setup_port, TIPC_NODE_SCOPE, &seq);
Allan Stephensaa702002010-12-31 18:59:21 +0000560 if (res) {
561 tipc_deleteport(topsrv.setup_port);
562 topsrv.setup_port = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100563 goto failed;
Allan Stephensaa702002010-12-31 18:59:21 +0000564 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100565
566 spin_unlock_bh(&topsrv.lock);
567 return 0;
568
569failed:
Per Lidend0a14a92006-01-11 13:52:51 +0100570 err("Failed to create subscription service\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100571 spin_unlock_bh(&topsrv.lock);
572 return res;
573}
574
Per Liden4323add2006-01-18 00:38:21 +0100575void tipc_subscr_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100576{
577 struct subscriber *subscriber;
578 struct subscriber *subscriber_temp;
579 spinlock_t *subscriber_lock;
580
Allan Stephensaa702002010-12-31 18:59:21 +0000581 if (topsrv.setup_port) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100582 tipc_deleteport(topsrv.setup_port);
Allan Stephensaa702002010-12-31 18:59:21 +0000583 topsrv.setup_port = 0;
584
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900585 list_for_each_entry_safe(subscriber, subscriber_temp,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100586 &topsrv.subscriber_list,
587 subscriber_list) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100588 subscriber_lock = subscriber->lock;
Allan Stephens28353e72008-05-19 13:29:47 -0700589 spin_lock_bh(subscriber_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100590 subscr_terminate(subscriber);
591 spin_unlock_bh(subscriber_lock);
592 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100593 }
594}