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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"
38#include "dbg.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010039#include "name_table.h"
Allan Stephens28353e72008-05-19 13:29:47 -070040#include "port.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010041#include "ref.h"
Allan Stephens5b06c85c2008-05-19 13:30:13 -070042#include "subscr.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010043
44/**
45 * struct subscriber - TIPC network topology subscriber
Allan Stephens28353e72008-05-19 13:29:47 -070046 * @port_ref: object reference to server port connecting to subscriber
47 * @lock: pointer to spinlock controlling access to subscriber's server port
Per Lidenb97bf3f2006-01-02 19:04:38 +010048 * @subscriber_list: adjacent subscribers in top. server's list of subscribers
49 * @subscription_list: list of subscription objects for this subscriber
Per Lidenb97bf3f2006-01-02 19:04:38 +010050 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090051
Per Lidenb97bf3f2006-01-02 19:04:38 +010052struct subscriber {
Allan Stephens28353e72008-05-19 13:29:47 -070053 u32 port_ref;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090054 spinlock_t *lock;
Per Lidenb97bf3f2006-01-02 19:04:38 +010055 struct list_head subscriber_list;
56 struct list_head subscription_list;
Per Lidenb97bf3f2006-01-02 19:04:38 +010057};
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
68struct 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
76static struct top_srv topsrv = { 0 };
77
78/**
Per Lidenb97bf3f2006-01-02 19:04:38 +010079 * subscr_send_event - send a message containing a tipc_event to the subscriber
Allan Stephens28353e72008-05-19 13:29:47 -070080 *
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!
Per Lidenb97bf3f2006-01-02 19:04:38 +010083 */
84
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090085static void subscr_send_event(struct subscription *sub,
86 u32 found_lower,
Per Lidenb97bf3f2006-01-02 19:04:38 +010087 u32 found_upper,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090088 u32 event,
89 u32 port_ref,
Per Lidenb97bf3f2006-01-02 19:04:38 +010090 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
Neil Hormand88dca72010-03-08 12:20:58 -080097 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);
Allan Stephens28353e72008-05-19 13:29:47 -0700102 tipc_send(sub->server_ref, 1, &msg_sect);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100103}
104
105/**
Per Liden4323add2006-01-18 00:38:21 +0100106 * tipc_subscr_overlap - test for subscription overlap with the given values
Per Lidenb97bf3f2006-01-02 19:04:38 +0100107 *
108 * Returns 1 if there is overlap, otherwise 0.
109 */
110
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900111int tipc_subscr_overlap(struct subscription *sub,
112 u32 found_lower,
Per Liden4323add2006-01-18 00:38:21 +0100113 u32 found_upper)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100114
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/**
Per Liden4323add2006-01-18 00:38:21 +0100126 * tipc_subscr_report_overlap - issue event if there is subscription overlap
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900127 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100128 * Protected by nameseq.lock in name_table.c
129 */
130
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900131void tipc_subscr_report_overlap(struct subscription *sub,
132 u32 found_lower,
Per Liden4323add2006-01-18 00:38:21 +0100133 u32 found_upper,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900134 u32 event,
135 u32 port_ref,
Per Liden4323add2006-01-18 00:38:21 +0100136 u32 node,
137 int must)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100138{
Per Liden4323add2006-01-18 00:38:21 +0100139 if (!tipc_subscr_overlap(sub, found_lower, found_upper))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100140 return;
Lijun Cheneb409462006-10-16 21:59:42 -0700141 if (!must && !(sub->filter & TIPC_SUB_PORTS))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100142 return;
Allan Stephense15f8802008-05-19 13:27:31 -0700143
144 sub->event_cb(sub, found_lower, found_upper, event, port_ref, node);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100145}
146
147/**
148 * subscr_timeout - subscription timeout has occurred
149 */
150
151static void subscr_timeout(struct subscription *sub)
152{
Allan Stephens28353e72008-05-19 13:29:47 -0700153 struct port *server_port;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100154
Allan Stephens28353e72008-05-19 13:29:47 -0700155 /* Validate server port reference (in case subscriber is terminating) */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100156
Allan Stephens28353e72008-05-19 13:29:47 -0700157 server_port = tipc_port_lock(sub->server_ref);
158 if (server_port == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100159 return;
160
Lijun Cheneb409462006-10-16 21:59:42 -0700161 /* Validate timeout (in case subscription is being cancelled) */
162
163 if (sub->timeout == TIPC_WAIT_FOREVER) {
Allan Stephens28353e72008-05-19 13:29:47 -0700164 tipc_port_unlock(server_port);
Lijun Cheneb409462006-10-16 21:59:42 -0700165 return;
166 }
167
Per Lidenb97bf3f2006-01-02 19:04:38 +0100168 /* Unlink subscription from name table */
169
Per Liden4323add2006-01-18 00:38:21 +0100170 tipc_nametbl_unsubscribe(sub);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100171
Allan Stephens28353e72008-05-19 13:29:47 -0700172 /* Unlink subscription from subscriber */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100173
Per Lidenb97bf3f2006-01-02 19:04:38 +0100174 list_del(&sub->subscription_list);
175
Allan Stephens28353e72008-05-19 13:29:47 -0700176 /* 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
Per Lidenb97bf3f2006-01-02 19:04:38 +0100185 /* Now destroy subscription */
186
Per Lidenb97bf3f2006-01-02 19:04:38 +0100187 k_term_timer(&sub->timer);
188 kfree(sub);
189 atomic_dec(&topsrv.subscription_count);
190}
191
192/**
Lijun Cheneb409462006-10-16 21:59:42 -0700193 * subscr_del - delete a subscription within a subscription list
194 *
Allan Stephens28353e72008-05-19 13:29:47 -0700195 * Called with subscriber port locked.
Lijun Cheneb409462006-10-16 21:59:42 -0700196 */
197
198static 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
206/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100207 * subscr_terminate - terminate communication with a subscriber
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900208 *
Allan Stephens28353e72008-05-19 13:29:47 -0700209 * Called with subscriber port locked. Routine must temporarily release lock
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900210 * to enable subscription timeout routine(s) to finish without deadlocking;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100211 * the lock is then reclaimed to allow caller to release it upon return.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900212 * (This should work even in the unlikely event some other thread creates
Per Lidenb97bf3f2006-01-02 19:04:38 +0100213 * 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
217static void subscr_terminate(struct subscriber *subscriber)
218{
Allan Stephens28353e72008-05-19 13:29:47 -0700219 u32 port_ref;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100220 struct subscription *sub;
221 struct subscription *sub_temp;
222
223 /* Invalidate subscriber reference */
224
Allan Stephens28353e72008-05-19 13:29:47 -0700225 port_ref = subscriber->port_ref;
226 subscriber->port_ref = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100227 spin_unlock_bh(subscriber->lock);
228
Allan Stephens28353e72008-05-19 13:29:47 -0700229 /* Sever connection to subscriber */
230
231 tipc_shutdown(port_ref);
232 tipc_deleteport(port_ref);
233
Per Lidenb97bf3f2006-01-02 19:04:38 +0100234 /* Destroy any existing subscriptions for subscriber */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900235
Per Lidenb97bf3f2006-01-02 19:04:38 +0100236 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 }
Lijun Cheneb409462006-10-16 21:59:42 -0700242 dbg("Term: Removing sub %u,%u,%u from subscriber %x list\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +0100243 sub->seq.type, sub->seq.lower, sub->seq.upper, subscriber);
Lijun Cheneb409462006-10-16 21:59:42 -0700244 subscr_del(sub);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100245 }
246
Per Lidenb97bf3f2006-01-02 19:04:38 +0100247 /* 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
Allan Stephens28353e72008-05-19 13:29:47 -0700253 /* Reclaim subscriber lock */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100254
255 spin_lock_bh(subscriber->lock);
Allan Stephens28353e72008-05-19 13:29:47 -0700256
257 /* Now destroy subscriber */
258
Per Lidenb97bf3f2006-01-02 19:04:38 +0100259 kfree(subscriber);
260}
261
262/**
Lijun Cheneb409462006-10-16 21:59:42 -0700263 * subscr_cancel - handle subscription cancellation request
264 *
Allan Stephens28353e72008-05-19 13:29:47 -0700265 * Called with subscriber port locked. Routine must temporarily release lock
Lijun Cheneb409462006-10-16 21:59:42 -0700266 * 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
272static void subscr_cancel(struct tipc_subscr *s,
273 struct subscriber *subscriber)
274{
275 struct subscription *sub;
276 struct subscription *sub_temp;
Jon Paul Maloyc6537d62010-04-06 11:40:52 +0000277 __u32 type, lower, upper, timeout, filter;
Lijun Cheneb409462006-10-16 21:59:42 -0700278 int found = 0;
279
280 /* Find first matching subscription, exit if not found */
281
Neil Hormand88dca72010-03-08 12:20:58 -0800282 type = ntohl(s->seq.type);
283 lower = ntohl(s->seq.lower);
284 upper = ntohl(s->seq.upper);
Jon Paul Maloyc6537d62010-04-06 11:40:52 +0000285 timeout = ntohl(s->timeout);
286 filter = ntohl(s->filter) & ~TIPC_SUB_CANCEL;
Neil Hormand88dca72010-03-08 12:20:58 -0800287
Lijun Cheneb409462006-10-16 21:59:42 -0700288 list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
289 subscription_list) {
Neil Hormand88dca72010-03-08 12:20:58 -0800290 if ((type == sub->seq.type) &&
291 (lower == sub->seq.lower) &&
Jon Paul Maloyc6537d62010-04-06 11:40:52 +0000292 (upper == sub->seq.upper) &&
293 (timeout == sub->timeout) &&
294 (filter == sub->filter) &&
295 !memcmp(s->usr_handle,sub->evt.s.usr_handle,
296 sizeof(s->usr_handle)) ){
Neil Hormand88dca72010-03-08 12:20:58 -0800297 found = 1;
298 break;
299 }
Lijun Cheneb409462006-10-16 21:59:42 -0700300 }
301 if (!found)
302 return;
303
304 /* Cancel subscription timer (if used), then delete subscription */
305
306 if (sub->timeout != TIPC_WAIT_FOREVER) {
307 sub->timeout = TIPC_WAIT_FOREVER;
308 spin_unlock_bh(subscriber->lock);
309 k_cancel_timer(&sub->timer);
310 k_term_timer(&sub->timer);
311 spin_lock_bh(subscriber->lock);
312 }
Jon Paul Maloyc6537d62010-04-06 11:40:52 +0000313 dbg("Cancel: removing sub %u,%u,%u from subscriber %p list\n",
Lijun Cheneb409462006-10-16 21:59:42 -0700314 sub->seq.type, sub->seq.lower, sub->seq.upper, subscriber);
315 subscr_del(sub);
316}
317
318/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100319 * subscr_subscribe - create subscription for subscriber
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900320 *
Allan Stephens28353e72008-05-19 13:29:47 -0700321 * Called with subscriber port locked.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100322 */
323
Allan Stephens28353e72008-05-19 13:29:47 -0700324static struct subscription *subscr_subscribe(struct tipc_subscr *s,
325 struct subscriber *subscriber)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100326{
327 struct subscription *sub;
Lijun Cheneb409462006-10-16 21:59:42 -0700328
329 /* Detect & process a subscription cancellation request */
330
Neil Hormand88dca72010-03-08 12:20:58 -0800331 if (ntohl(s->filter) & TIPC_SUB_CANCEL) {
Lijun Cheneb409462006-10-16 21:59:42 -0700332 subscr_cancel(s, subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700333 return NULL;
Lijun Cheneb409462006-10-16 21:59:42 -0700334 }
335
Per Lidenb97bf3f2006-01-02 19:04:38 +0100336 /* Refuse subscription if global limit exceeded */
337
338 if (atomic_read(&topsrv.subscription_count) >= tipc_max_subscriptions) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700339 warn("Subscription rejected, subscription limit reached (%u)\n",
340 tipc_max_subscriptions);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100341 subscr_terminate(subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700342 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100343 }
344
345 /* Allocate subscription object */
346
Allan Stephens28353e72008-05-19 13:29:47 -0700347 sub = kmalloc(sizeof(*sub), GFP_ATOMIC);
Allan Stephensa10bd922006-06-25 23:52:17 -0700348 if (!sub) {
349 warn("Subscription rejected, no memory\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100350 subscr_terminate(subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700351 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100352 }
353
Per Lidenb97bf3f2006-01-02 19:04:38 +0100354 /* Initialize subscription object */
355
Neil Hormand88dca72010-03-08 12:20:58 -0800356 sub->seq.type = ntohl(s->seq.type);
357 sub->seq.lower = ntohl(s->seq.lower);
358 sub->seq.upper = ntohl(s->seq.upper);
359 sub->timeout = ntohl(s->timeout);
360 sub->filter = ntohl(s->filter);
Jon Paul Maloyc6537d62010-04-06 11:40:52 +0000361 if ((sub->filter && (sub->filter != TIPC_SUB_PORTS)) ||
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;
Allan Stephens28353e72008-05-19 13:29:47 -0700372 memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100373 atomic_inc(&topsrv.subscription_count);
374 if (sub->timeout != TIPC_WAIT_FOREVER) {
375 k_init_timer(&sub->timer,
376 (Handler)subscr_timeout, (unsigned long)sub);
377 k_start_timer(&sub->timer, sub->timeout);
378 }
Allan Stephens28353e72008-05-19 13:29:47 -0700379
380 return sub;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100381}
382
383/**
384 * subscr_conn_shutdown_event - handle termination request from subscriber
Allan Stephens28353e72008-05-19 13:29:47 -0700385 *
386 * Called with subscriber's server port unlocked.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100387 */
388
389static void subscr_conn_shutdown_event(void *usr_handle,
Allan Stephens28353e72008-05-19 13:29:47 -0700390 u32 port_ref,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100391 struct sk_buff **buf,
392 unsigned char const *data,
393 unsigned int size,
394 int reason)
395{
Allan Stephens28353e72008-05-19 13:29:47 -0700396 struct subscriber *subscriber = usr_handle;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100397 spinlock_t *subscriber_lock;
398
Allan Stephens28353e72008-05-19 13:29:47 -0700399 if (tipc_port_lock(port_ref) == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100400 return;
401
402 subscriber_lock = subscriber->lock;
403 subscr_terminate(subscriber);
404 spin_unlock_bh(subscriber_lock);
405}
406
407/**
408 * subscr_conn_msg_event - handle new subscription request from subscriber
Allan Stephens28353e72008-05-19 13:29:47 -0700409 *
410 * Called with subscriber's server port unlocked.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100411 */
412
413static void subscr_conn_msg_event(void *usr_handle,
414 u32 port_ref,
415 struct sk_buff **buf,
416 const unchar *data,
417 u32 size)
418{
Allan Stephens28353e72008-05-19 13:29:47 -0700419 struct subscriber *subscriber = usr_handle;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100420 spinlock_t *subscriber_lock;
Allan Stephens28353e72008-05-19 13:29:47 -0700421 struct subscription *sub;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100422
Allan Stephens28353e72008-05-19 13:29:47 -0700423 /*
424 * Lock subscriber's server port (& make a local copy of lock pointer,
425 * in case subscriber is deleted while processing subscription request)
426 */
427
428 if (tipc_port_lock(port_ref) == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100429 return;
430
431 subscriber_lock = subscriber->lock;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900432
Allan Stephens28353e72008-05-19 13:29:47 -0700433 if (size != sizeof(struct tipc_subscr)) {
434 subscr_terminate(subscriber);
435 spin_unlock_bh(subscriber_lock);
436 } else {
437 sub = subscr_subscribe((struct tipc_subscr *)data, subscriber);
438 spin_unlock_bh(subscriber_lock);
439 if (sub != NULL) {
440
441 /*
442 * We must release the server port lock before adding a
443 * subscription to the name table since TIPC needs to be
444 * able to (re)acquire the port lock if an event message
445 * issued by the subscription process is rejected and
446 * returned. The subscription cannot be deleted while
447 * it is being added to the name table because:
448 * a) the single-threading of the native API port code
449 * ensures the subscription cannot be cancelled and
450 * the subscriber connection cannot be broken, and
451 * b) the name table lock ensures the subscription
452 * timeout code cannot delete the subscription,
453 * so the subscription object is still protected.
454 */
455
456 tipc_nametbl_subscribe(sub);
457 }
458 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100459}
460
461/**
462 * subscr_named_msg_event - handle request to establish a new subscriber
463 */
464
465static void subscr_named_msg_event(void *usr_handle,
466 u32 port_ref,
467 struct sk_buff **buf,
468 const unchar *data,
469 u32 size,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900470 u32 importance,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100471 struct tipc_portid const *orig,
472 struct tipc_name_seq const *dest)
473{
Allan Stephens28353e72008-05-19 13:29:47 -0700474 static struct iovec msg_sect = {NULL, 0};
Per Lidenb97bf3f2006-01-02 19:04:38 +0100475
Allan Stephens28353e72008-05-19 13:29:47 -0700476 struct subscriber *subscriber;
477 u32 server_port_ref;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100478
479 /* Create subscriber object */
480
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700481 subscriber = kzalloc(sizeof(struct subscriber), GFP_ATOMIC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100482 if (subscriber == NULL) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700483 warn("Subscriber rejected, no memory\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100484 return;
485 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100486 INIT_LIST_HEAD(&subscriber->subscription_list);
487 INIT_LIST_HEAD(&subscriber->subscriber_list);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100488
Allan Stephens28353e72008-05-19 13:29:47 -0700489 /* Create server port & establish connection to subscriber */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100490
491 tipc_createport(topsrv.user_ref,
Allan Stephens28353e72008-05-19 13:29:47 -0700492 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};
539 int res = -1;
540
541 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);
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800546 res = tipc_attach(&topsrv.user_ref, NULL, NULL);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100547 if (res) {
548 spin_unlock_bh(&topsrv.lock);
549 return res;
550 }
551
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900552 res = tipc_createport(topsrv.user_ref,
553 NULL,
554 TIPC_CRITICAL_IMPORTANCE,
555 NULL,
556 NULL,
557 NULL,
558 NULL,
559 subscr_named_msg_event,
560 NULL,
561 NULL,
562 &topsrv.setup_port);
563 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100564 goto failed;
565
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900566 res = tipc_nametbl_publish_rsv(topsrv.setup_port, TIPC_NODE_SCOPE, &seq);
567 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100568 goto failed;
569
570 spin_unlock_bh(&topsrv.lock);
571 return 0;
572
573failed:
Per Lidend0a14a92006-01-11 13:52:51 +0100574 err("Failed to create subscription service\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100575 tipc_detach(topsrv.user_ref);
576 topsrv.user_ref = 0;
577 spin_unlock_bh(&topsrv.lock);
578 return res;
579}
580
Per Liden4323add2006-01-18 00:38:21 +0100581void tipc_subscr_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100582{
583 struct subscriber *subscriber;
584 struct subscriber *subscriber_temp;
585 spinlock_t *subscriber_lock;
586
587 if (topsrv.user_ref) {
588 tipc_deleteport(topsrv.setup_port);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900589 list_for_each_entry_safe(subscriber, subscriber_temp,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100590 &topsrv.subscriber_list,
591 subscriber_list) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100592 subscriber_lock = subscriber->lock;
Allan Stephens28353e72008-05-19 13:29:47 -0700593 spin_lock_bh(subscriber_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100594 subscr_terminate(subscriber);
595 spin_unlock_bh(subscriber_lock);
596 }
597 tipc_detach(topsrv.user_ref);
598 topsrv.user_ref = 0;
599 }
600}
601
602
603int tipc_ispublished(struct tipc_name const *name)
604{
605 u32 domain = 0;
606
Per Liden4323add2006-01-18 00:38:21 +0100607 return(tipc_nametbl_translate(name->type, name->instance,&domain) != 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100608}
609