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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/**
79 * htohl - convert value to endianness used by destination
80 * @in: value to convert
81 * @swap: non-zero if endianness must be reversed
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090082 *
Per Lidenb97bf3f2006-01-02 19:04:38 +010083 * Returns converted value
84 */
85
Sam Ravnborg05790c62006-03-20 22:37:04 -080086static u32 htohl(u32 in, int swap)
Per Lidenb97bf3f2006-01-02 19:04:38 +010087{
Allan Stephensfc5ad582008-05-19 13:29:06 -070088 return swap ? (u32)___constant_swab32(in) : in;
Per Lidenb97bf3f2006-01-02 19:04:38 +010089}
90
91/**
92 * subscr_send_event - send a message containing a tipc_event to the subscriber
Allan Stephens28353e72008-05-19 13:29:47 -070093 *
94 * Note: Must not hold subscriber's server port lock, since tipc_send() will
95 * try to take the lock if the message is rejected and returned!
Per Lidenb97bf3f2006-01-02 19:04:38 +010096 */
97
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090098static void subscr_send_event(struct subscription *sub,
99 u32 found_lower,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100100 u32 found_upper,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900101 u32 event,
102 u32 port_ref,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100103 u32 node)
104{
105 struct iovec msg_sect;
106
107 msg_sect.iov_base = (void *)&sub->evt;
108 msg_sect.iov_len = sizeof(struct tipc_event);
109
Allan Stephens8e9501f2008-05-19 13:28:32 -0700110 sub->evt.event = htohl(event, sub->swap);
111 sub->evt.found_lower = htohl(found_lower, sub->swap);
112 sub->evt.found_upper = htohl(found_upper, sub->swap);
113 sub->evt.port.ref = htohl(port_ref, sub->swap);
114 sub->evt.port.node = htohl(node, sub->swap);
Allan Stephens28353e72008-05-19 13:29:47 -0700115 tipc_send(sub->server_ref, 1, &msg_sect);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100116}
117
118/**
Per Liden4323add2006-01-18 00:38:21 +0100119 * tipc_subscr_overlap - test for subscription overlap with the given values
Per Lidenb97bf3f2006-01-02 19:04:38 +0100120 *
121 * Returns 1 if there is overlap, otherwise 0.
122 */
123
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900124int tipc_subscr_overlap(struct subscription *sub,
125 u32 found_lower,
Per Liden4323add2006-01-18 00:38:21 +0100126 u32 found_upper)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100127
128{
129 if (found_lower < sub->seq.lower)
130 found_lower = sub->seq.lower;
131 if (found_upper > sub->seq.upper)
132 found_upper = sub->seq.upper;
133 if (found_lower > found_upper)
134 return 0;
135 return 1;
136}
137
138/**
Per Liden4323add2006-01-18 00:38:21 +0100139 * tipc_subscr_report_overlap - issue event if there is subscription overlap
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900140 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100141 * Protected by nameseq.lock in name_table.c
142 */
143
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900144void tipc_subscr_report_overlap(struct subscription *sub,
145 u32 found_lower,
Per Liden4323add2006-01-18 00:38:21 +0100146 u32 found_upper,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900147 u32 event,
148 u32 port_ref,
Per Liden4323add2006-01-18 00:38:21 +0100149 u32 node,
150 int must)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100151{
Per Liden4323add2006-01-18 00:38:21 +0100152 if (!tipc_subscr_overlap(sub, found_lower, found_upper))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100153 return;
Lijun Cheneb409462006-10-16 21:59:42 -0700154 if (!must && !(sub->filter & TIPC_SUB_PORTS))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100155 return;
Allan Stephense15f8802008-05-19 13:27:31 -0700156
157 sub->event_cb(sub, found_lower, found_upper, event, port_ref, node);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100158}
159
160/**
161 * subscr_timeout - subscription timeout has occurred
162 */
163
164static void subscr_timeout(struct subscription *sub)
165{
Allan Stephens28353e72008-05-19 13:29:47 -0700166 struct port *server_port;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100167
Allan Stephens28353e72008-05-19 13:29:47 -0700168 /* Validate server port reference (in case subscriber is terminating) */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100169
Allan Stephens28353e72008-05-19 13:29:47 -0700170 server_port = tipc_port_lock(sub->server_ref);
171 if (server_port == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100172 return;
173
Lijun Cheneb409462006-10-16 21:59:42 -0700174 /* Validate timeout (in case subscription is being cancelled) */
175
176 if (sub->timeout == TIPC_WAIT_FOREVER) {
Allan Stephens28353e72008-05-19 13:29:47 -0700177 tipc_port_unlock(server_port);
Lijun Cheneb409462006-10-16 21:59:42 -0700178 return;
179 }
180
Per Lidenb97bf3f2006-01-02 19:04:38 +0100181 /* Unlink subscription from name table */
182
Per Liden4323add2006-01-18 00:38:21 +0100183 tipc_nametbl_unsubscribe(sub);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100184
Allan Stephens28353e72008-05-19 13:29:47 -0700185 /* Unlink subscription from subscriber */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100186
Per Lidenb97bf3f2006-01-02 19:04:38 +0100187 list_del(&sub->subscription_list);
188
Allan Stephens28353e72008-05-19 13:29:47 -0700189 /* Release subscriber's server port */
190
191 tipc_port_unlock(server_port);
192
193 /* Notify subscriber of timeout */
194
195 subscr_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper,
196 TIPC_SUBSCR_TIMEOUT, 0, 0);
197
Per Lidenb97bf3f2006-01-02 19:04:38 +0100198 /* Now destroy subscription */
199
Per Lidenb97bf3f2006-01-02 19:04:38 +0100200 k_term_timer(&sub->timer);
201 kfree(sub);
202 atomic_dec(&topsrv.subscription_count);
203}
204
205/**
Lijun Cheneb409462006-10-16 21:59:42 -0700206 * subscr_del - delete a subscription within a subscription list
207 *
Allan Stephens28353e72008-05-19 13:29:47 -0700208 * Called with subscriber port locked.
Lijun Cheneb409462006-10-16 21:59:42 -0700209 */
210
211static void subscr_del(struct subscription *sub)
212{
213 tipc_nametbl_unsubscribe(sub);
214 list_del(&sub->subscription_list);
215 kfree(sub);
216 atomic_dec(&topsrv.subscription_count);
217}
218
219/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100220 * subscr_terminate - terminate communication with a subscriber
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900221 *
Allan Stephens28353e72008-05-19 13:29:47 -0700222 * Called with subscriber port locked. Routine must temporarily release lock
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900223 * to enable subscription timeout routine(s) to finish without deadlocking;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100224 * the lock is then reclaimed to allow caller to release it upon return.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900225 * (This should work even in the unlikely event some other thread creates
Per Lidenb97bf3f2006-01-02 19:04:38 +0100226 * a new object reference in the interim that uses this lock; this routine will
227 * simply wait for it to be released, then claim it.)
228 */
229
230static void subscr_terminate(struct subscriber *subscriber)
231{
Allan Stephens28353e72008-05-19 13:29:47 -0700232 u32 port_ref;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100233 struct subscription *sub;
234 struct subscription *sub_temp;
235
236 /* Invalidate subscriber reference */
237
Allan Stephens28353e72008-05-19 13:29:47 -0700238 port_ref = subscriber->port_ref;
239 subscriber->port_ref = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100240 spin_unlock_bh(subscriber->lock);
241
Allan Stephens28353e72008-05-19 13:29:47 -0700242 /* Sever connection to subscriber */
243
244 tipc_shutdown(port_ref);
245 tipc_deleteport(port_ref);
246
Per Lidenb97bf3f2006-01-02 19:04:38 +0100247 /* Destroy any existing subscriptions for subscriber */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900248
Per Lidenb97bf3f2006-01-02 19:04:38 +0100249 list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
250 subscription_list) {
251 if (sub->timeout != TIPC_WAIT_FOREVER) {
252 k_cancel_timer(&sub->timer);
253 k_term_timer(&sub->timer);
254 }
Lijun Cheneb409462006-10-16 21:59:42 -0700255 dbg("Term: Removing sub %u,%u,%u from subscriber %x list\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +0100256 sub->seq.type, sub->seq.lower, sub->seq.upper, subscriber);
Lijun Cheneb409462006-10-16 21:59:42 -0700257 subscr_del(sub);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100258 }
259
Per Lidenb97bf3f2006-01-02 19:04:38 +0100260 /* Remove subscriber from topology server's subscriber list */
261
262 spin_lock_bh(&topsrv.lock);
263 list_del(&subscriber->subscriber_list);
264 spin_unlock_bh(&topsrv.lock);
265
Allan Stephens28353e72008-05-19 13:29:47 -0700266 /* Reclaim subscriber lock */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100267
268 spin_lock_bh(subscriber->lock);
Allan Stephens28353e72008-05-19 13:29:47 -0700269
270 /* Now destroy subscriber */
271
Per Lidenb97bf3f2006-01-02 19:04:38 +0100272 kfree(subscriber);
273}
274
275/**
Lijun Cheneb409462006-10-16 21:59:42 -0700276 * subscr_cancel - handle subscription cancellation request
277 *
Allan Stephens28353e72008-05-19 13:29:47 -0700278 * Called with subscriber port locked. Routine must temporarily release lock
Lijun Cheneb409462006-10-16 21:59:42 -0700279 * to enable the subscription timeout routine to finish without deadlocking;
280 * the lock is then reclaimed to allow caller to release it upon return.
281 *
282 * Note that fields of 's' use subscriber's endianness!
283 */
284
285static void subscr_cancel(struct tipc_subscr *s,
286 struct subscriber *subscriber)
287{
288 struct subscription *sub;
289 struct subscription *sub_temp;
290 int found = 0;
291
292 /* Find first matching subscription, exit if not found */
293
294 list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
295 subscription_list) {
296 if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) {
297 found = 1;
298 break;
299 }
300 }
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 }
313 dbg("Cancel: removing sub %u,%u,%u from subscriber %x list\n",
314 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;
Allan Stephens8e9501f2008-05-19 13:28:32 -0700328 int swap;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100329
Allan Stephens8e9501f2008-05-19 13:28:32 -0700330 /* Determine subscriber's endianness */
Lijun Cheneb409462006-10-16 21:59:42 -0700331
Allan Stephens8e9501f2008-05-19 13:28:32 -0700332 swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE));
Lijun Cheneb409462006-10-16 21:59:42 -0700333
334 /* Detect & process a subscription cancellation request */
335
Allan Stephens8e9501f2008-05-19 13:28:32 -0700336 if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) {
337 s->filter &= ~htohl(TIPC_SUB_CANCEL, swap);
Lijun Cheneb409462006-10-16 21:59:42 -0700338 subscr_cancel(s, subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700339 return NULL;
Lijun Cheneb409462006-10-16 21:59:42 -0700340 }
341
Per Lidenb97bf3f2006-01-02 19:04:38 +0100342 /* Refuse subscription if global limit exceeded */
343
344 if (atomic_read(&topsrv.subscription_count) >= tipc_max_subscriptions) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700345 warn("Subscription rejected, subscription limit reached (%u)\n",
346 tipc_max_subscriptions);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100347 subscr_terminate(subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700348 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100349 }
350
351 /* Allocate subscription object */
352
Allan Stephens28353e72008-05-19 13:29:47 -0700353 sub = kmalloc(sizeof(*sub), GFP_ATOMIC);
Allan Stephensa10bd922006-06-25 23:52:17 -0700354 if (!sub) {
355 warn("Subscription rejected, no memory\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100356 subscr_terminate(subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700357 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100358 }
359
Per Lidenb97bf3f2006-01-02 19:04:38 +0100360 /* Initialize subscription object */
361
Allan Stephens8e9501f2008-05-19 13:28:32 -0700362 sub->seq.type = htohl(s->seq.type, swap);
363 sub->seq.lower = htohl(s->seq.lower, swap);
364 sub->seq.upper = htohl(s->seq.upper, swap);
365 sub->timeout = htohl(s->timeout, swap);
366 sub->filter = htohl(s->filter, swap);
Lijun Cheneb409462006-10-16 21:59:42 -0700367 if ((!(sub->filter & TIPC_SUB_PORTS)
368 == !(sub->filter & TIPC_SUB_SERVICE))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100369 || (sub->seq.lower > sub->seq.upper)) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700370 warn("Subscription rejected, illegal request\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100371 kfree(sub);
372 subscr_terminate(subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700373 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100374 }
Allan Stephense15f8802008-05-19 13:27:31 -0700375 sub->event_cb = subscr_send_event;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100376 INIT_LIST_HEAD(&sub->nameseq_list);
377 list_add(&sub->subscription_list, &subscriber->subscription_list);
Allan Stephens28353e72008-05-19 13:29:47 -0700378 sub->server_ref = subscriber->port_ref;
Allan Stephens8e9501f2008-05-19 13:28:32 -0700379 sub->swap = swap;
Allan Stephens28353e72008-05-19 13:29:47 -0700380 memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100381 atomic_inc(&topsrv.subscription_count);
382 if (sub->timeout != TIPC_WAIT_FOREVER) {
383 k_init_timer(&sub->timer,
384 (Handler)subscr_timeout, (unsigned long)sub);
385 k_start_timer(&sub->timer, sub->timeout);
386 }
Allan Stephens28353e72008-05-19 13:29:47 -0700387
388 return sub;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100389}
390
391/**
392 * subscr_conn_shutdown_event - handle termination request from subscriber
Allan Stephens28353e72008-05-19 13:29:47 -0700393 *
394 * Called with subscriber's server port unlocked.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100395 */
396
397static void subscr_conn_shutdown_event(void *usr_handle,
Allan Stephens28353e72008-05-19 13:29:47 -0700398 u32 port_ref,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100399 struct sk_buff **buf,
400 unsigned char const *data,
401 unsigned int size,
402 int reason)
403{
Allan Stephens28353e72008-05-19 13:29:47 -0700404 struct subscriber *subscriber = usr_handle;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100405 spinlock_t *subscriber_lock;
406
Allan Stephens28353e72008-05-19 13:29:47 -0700407 if (tipc_port_lock(port_ref) == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100408 return;
409
410 subscriber_lock = subscriber->lock;
411 subscr_terminate(subscriber);
412 spin_unlock_bh(subscriber_lock);
413}
414
415/**
416 * subscr_conn_msg_event - handle new subscription request from subscriber
Allan Stephens28353e72008-05-19 13:29:47 -0700417 *
418 * Called with subscriber's server port unlocked.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100419 */
420
421static void subscr_conn_msg_event(void *usr_handle,
422 u32 port_ref,
423 struct sk_buff **buf,
424 const unchar *data,
425 u32 size)
426{
Allan Stephens28353e72008-05-19 13:29:47 -0700427 struct subscriber *subscriber = usr_handle;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100428 spinlock_t *subscriber_lock;
Allan Stephens28353e72008-05-19 13:29:47 -0700429 struct subscription *sub;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100430
Allan Stephens28353e72008-05-19 13:29:47 -0700431 /*
432 * Lock subscriber's server port (& make a local copy of lock pointer,
433 * in case subscriber is deleted while processing subscription request)
434 */
435
436 if (tipc_port_lock(port_ref) == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100437 return;
438
439 subscriber_lock = subscriber->lock;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900440
Allan Stephens28353e72008-05-19 13:29:47 -0700441 if (size != sizeof(struct tipc_subscr)) {
442 subscr_terminate(subscriber);
443 spin_unlock_bh(subscriber_lock);
444 } else {
445 sub = subscr_subscribe((struct tipc_subscr *)data, subscriber);
446 spin_unlock_bh(subscriber_lock);
447 if (sub != NULL) {
448
449 /*
450 * We must release the server port lock before adding a
451 * subscription to the name table since TIPC needs to be
452 * able to (re)acquire the port lock if an event message
453 * issued by the subscription process is rejected and
454 * returned. The subscription cannot be deleted while
455 * it is being added to the name table because:
456 * a) the single-threading of the native API port code
457 * ensures the subscription cannot be cancelled and
458 * the subscriber connection cannot be broken, and
459 * b) the name table lock ensures the subscription
460 * timeout code cannot delete the subscription,
461 * so the subscription object is still protected.
462 */
463
464 tipc_nametbl_subscribe(sub);
465 }
466 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100467}
468
469/**
470 * subscr_named_msg_event - handle request to establish a new subscriber
471 */
472
473static void subscr_named_msg_event(void *usr_handle,
474 u32 port_ref,
475 struct sk_buff **buf,
476 const unchar *data,
477 u32 size,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900478 u32 importance,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100479 struct tipc_portid const *orig,
480 struct tipc_name_seq const *dest)
481{
Allan Stephens28353e72008-05-19 13:29:47 -0700482 static struct iovec msg_sect = {NULL, 0};
Per Lidenb97bf3f2006-01-02 19:04:38 +0100483
Allan Stephens28353e72008-05-19 13:29:47 -0700484 struct subscriber *subscriber;
485 u32 server_port_ref;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100486
487 /* Create subscriber object */
488
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700489 subscriber = kzalloc(sizeof(struct subscriber), GFP_ATOMIC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100490 if (subscriber == NULL) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700491 warn("Subscriber rejected, no memory\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100492 return;
493 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100494 INIT_LIST_HEAD(&subscriber->subscription_list);
495 INIT_LIST_HEAD(&subscriber->subscriber_list);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100496
Allan Stephens28353e72008-05-19 13:29:47 -0700497 /* Create server port & establish connection to subscriber */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100498
499 tipc_createport(topsrv.user_ref,
Allan Stephens28353e72008-05-19 13:29:47 -0700500 subscriber,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100501 importance,
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800502 NULL,
503 NULL,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100504 subscr_conn_shutdown_event,
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800505 NULL,
506 NULL,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100507 subscr_conn_msg_event,
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800508 NULL,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100509 &subscriber->port_ref);
510 if (subscriber->port_ref == 0) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700511 warn("Subscriber rejected, unable to create port\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100512 kfree(subscriber);
513 return;
514 }
515 tipc_connect2port(subscriber->port_ref, orig);
516
Allan Stephens28353e72008-05-19 13:29:47 -0700517 /* Lock server port (& save lock address for future use) */
518
519 subscriber->lock = tipc_port_lock(subscriber->port_ref)->publ.lock;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100520
521 /* Add subscriber to topology server's subscriber list */
522
Per Lidenb97bf3f2006-01-02 19:04:38 +0100523 spin_lock_bh(&topsrv.lock);
524 list_add(&subscriber->subscriber_list, &topsrv.subscriber_list);
525 spin_unlock_bh(&topsrv.lock);
526
Allan Stephens28353e72008-05-19 13:29:47 -0700527 /* Unlock server port */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100528
Allan Stephens28353e72008-05-19 13:29:47 -0700529 server_port_ref = subscriber->port_ref;
530 spin_unlock_bh(subscriber->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100531
Allan Stephens28353e72008-05-19 13:29:47 -0700532 /* Send an ACK- to complete connection handshaking */
533
534 tipc_send(server_port_ref, 1, &msg_sect);
535
536 /* Handle optional subscription request */
537
538 if (size != 0) {
539 subscr_conn_msg_event(subscriber, server_port_ref,
540 buf, data, size);
541 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100542}
543
Per Liden4323add2006-01-18 00:38:21 +0100544int tipc_subscr_start(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100545{
546 struct tipc_name_seq seq = {TIPC_TOP_SRV, TIPC_TOP_SRV, TIPC_TOP_SRV};
547 int res = -1;
548
549 memset(&topsrv, 0, sizeof (topsrv));
Ingo Molnar34af9462006-06-27 02:53:55 -0700550 spin_lock_init(&topsrv.lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100551 INIT_LIST_HEAD(&topsrv.subscriber_list);
552
553 spin_lock_bh(&topsrv.lock);
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800554 res = tipc_attach(&topsrv.user_ref, NULL, NULL);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100555 if (res) {
556 spin_unlock_bh(&topsrv.lock);
557 return res;
558 }
559
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900560 res = tipc_createport(topsrv.user_ref,
561 NULL,
562 TIPC_CRITICAL_IMPORTANCE,
563 NULL,
564 NULL,
565 NULL,
566 NULL,
567 subscr_named_msg_event,
568 NULL,
569 NULL,
570 &topsrv.setup_port);
571 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100572 goto failed;
573
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900574 res = tipc_nametbl_publish_rsv(topsrv.setup_port, TIPC_NODE_SCOPE, &seq);
575 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100576 goto failed;
577
578 spin_unlock_bh(&topsrv.lock);
579 return 0;
580
581failed:
Per Lidend0a14a92006-01-11 13:52:51 +0100582 err("Failed to create subscription service\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100583 tipc_detach(topsrv.user_ref);
584 topsrv.user_ref = 0;
585 spin_unlock_bh(&topsrv.lock);
586 return res;
587}
588
Per Liden4323add2006-01-18 00:38:21 +0100589void tipc_subscr_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100590{
591 struct subscriber *subscriber;
592 struct subscriber *subscriber_temp;
593 spinlock_t *subscriber_lock;
594
595 if (topsrv.user_ref) {
596 tipc_deleteport(topsrv.setup_port);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900597 list_for_each_entry_safe(subscriber, subscriber_temp,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100598 &topsrv.subscriber_list,
599 subscriber_list) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100600 subscriber_lock = subscriber->lock;
Allan Stephens28353e72008-05-19 13:29:47 -0700601 spin_lock_bh(subscriber_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100602 subscr_terminate(subscriber);
603 spin_unlock_bh(subscriber_lock);
604 }
605 tipc_detach(topsrv.user_ref);
606 topsrv.user_ref = 0;
607 }
608}
609
610
611int tipc_ispublished(struct tipc_name const *name)
612{
613 u32 domain = 0;
614
Per Liden4323add2006-01-18 00:38:21 +0100615 return(tipc_nametbl_translate(name->type, name->instance,&domain) != 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100616}
617