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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
Ying Xue13a2e892013-06-17 10:54:40 -04005 * Copyright (c) 2005-2007, 2010-2013, 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 Stephens5b06c85c2008-05-19 13:30:13 -070039#include "subscr.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010040
41/**
Paul Gortmaker11f99902011-12-29 20:49:39 -050042 * struct tipc_subscriber - TIPC network topology subscriber
Ying Xue13a2e892013-06-17 10:54:40 -040043 * @conid: connection identifier to server connecting to subscriber
stephen hemminger963a18552014-01-12 12:48:00 -080044 * @lock: control access to subscriber
Per Lidenb97bf3f2006-01-02 19:04:38 +010045 * @subscription_list: list of subscription objects for this subscriber
Per Lidenb97bf3f2006-01-02 19:04:38 +010046 */
Paul Gortmaker11f99902011-12-29 20:49:39 -050047struct tipc_subscriber {
Ying Xue13a2e892013-06-17 10:54:40 -040048 int conid;
49 spinlock_t lock;
Per Lidenb97bf3f2006-01-02 19:04:38 +010050 struct list_head subscription_list;
Per Lidenb97bf3f2006-01-02 19:04:38 +010051};
52
Ying Xue13a2e892013-06-17 10:54:40 -040053static void subscr_conn_msg_event(int conid, struct sockaddr_tipc *addr,
54 void *usr_data, void *buf, size_t len);
55static void *subscr_named_msg_event(int conid);
56static void subscr_conn_shutdown_event(int conid, void *usr_data);
57
58static atomic_t subscription_count = ATOMIC_INIT(0);
59
60static struct sockaddr_tipc topsrv_addr __read_mostly = {
61 .family = AF_TIPC,
62 .addrtype = TIPC_ADDR_NAMESEQ,
63 .addr.nameseq.type = TIPC_TOP_SRV,
64 .addr.nameseq.lower = TIPC_TOP_SRV,
65 .addr.nameseq.upper = TIPC_TOP_SRV,
66 .scope = TIPC_NODE_SCOPE
Per Lidenb97bf3f2006-01-02 19:04:38 +010067};
68
Ying Xue13a2e892013-06-17 10:54:40 -040069static struct tipc_server topsrv __read_mostly = {
70 .saddr = &topsrv_addr,
71 .imp = TIPC_CRITICAL_IMPORTANCE,
72 .type = SOCK_SEQPACKET,
73 .max_rcvbuf_size = sizeof(struct tipc_subscr),
74 .name = "topology_server",
75 .tipc_conn_recvmsg = subscr_conn_msg_event,
76 .tipc_conn_new = subscr_named_msg_event,
77 .tipc_conn_shutdown = subscr_conn_shutdown_event,
78};
Per Lidenb97bf3f2006-01-02 19:04:38 +010079
80/**
Neil Hormandb5a7532010-10-21 01:06:16 +000081 * htohl - convert value to endianness used by destination
82 * @in: value to convert
83 * @swap: non-zero if endianness must be reversed
84 *
85 * Returns converted value
86 */
Neil Hormandb5a7532010-10-21 01:06:16 +000087static u32 htohl(u32 in, int swap)
88{
89 return swap ? swab32(in) : in;
90}
91
Ying Xue13a2e892013-06-17 10:54:40 -040092static void subscr_send_event(struct tipc_subscription *sub, u32 found_lower,
93 u32 found_upper, u32 event, u32 port_ref,
Per Lidenb97bf3f2006-01-02 19:04:38 +010094 u32 node)
95{
Ying Xue13a2e892013-06-17 10:54:40 -040096 struct tipc_subscriber *subscriber = sub->subscriber;
97 struct kvec msg_sect;
Per Lidenb97bf3f2006-01-02 19:04:38 +010098
99 msg_sect.iov_base = (void *)&sub->evt;
100 msg_sect.iov_len = sizeof(struct tipc_event);
Neil Hormandb5a7532010-10-21 01:06:16 +0000101 sub->evt.event = htohl(event, sub->swap);
102 sub->evt.found_lower = htohl(found_lower, sub->swap);
103 sub->evt.found_upper = htohl(found_upper, sub->swap);
104 sub->evt.port.ref = htohl(port_ref, sub->swap);
105 sub->evt.port.node = htohl(node, sub->swap);
Ying Xue6d4ebeb2014-03-06 14:40:16 +0100106 tipc_conn_sendmsg(&topsrv, subscriber->conid, NULL, msg_sect.iov_base,
107 msg_sect.iov_len);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100108}
109
110/**
Per Liden4323add2006-01-18 00:38:21 +0100111 * tipc_subscr_overlap - test for subscription overlap with the given values
Per Lidenb97bf3f2006-01-02 19:04:38 +0100112 *
113 * Returns 1 if there is overlap, otherwise 0.
114 */
Paul Gortmakerae8509c2013-06-17 10:54:47 -0400115int tipc_subscr_overlap(struct tipc_subscription *sub, u32 found_lower,
Per Liden4323add2006-01-18 00:38:21 +0100116 u32 found_upper)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100117{
118 if (found_lower < sub->seq.lower)
119 found_lower = sub->seq.lower;
120 if (found_upper > sub->seq.upper)
121 found_upper = sub->seq.upper;
122 if (found_lower > found_upper)
123 return 0;
124 return 1;
125}
126
127/**
Per Liden4323add2006-01-18 00:38:21 +0100128 * tipc_subscr_report_overlap - issue event if there is subscription overlap
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900129 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100130 * Protected by nameseq.lock in name_table.c
131 */
Paul Gortmakerae8509c2013-06-17 10:54:47 -0400132void tipc_subscr_report_overlap(struct tipc_subscription *sub, u32 found_lower,
133 u32 found_upper, u32 event, u32 port_ref,
134 u32 node, int must)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100135{
Per Liden4323add2006-01-18 00:38:21 +0100136 if (!tipc_subscr_overlap(sub, found_lower, found_upper))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100137 return;
Lijun Cheneb409462006-10-16 21:59:42 -0700138 if (!must && !(sub->filter & TIPC_SUB_PORTS))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100139 return;
Allan Stephense15f8802008-05-19 13:27:31 -0700140
Ying Xue7e244772011-07-19 04:21:56 -0400141 subscr_send_event(sub, found_lower, found_upper, event, port_ref, node);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100142}
143
Paul Gortmakerfead3902011-12-29 20:43:44 -0500144static void subscr_timeout(struct tipc_subscription *sub)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100145{
Ying Xue13a2e892013-06-17 10:54:40 -0400146 struct tipc_subscriber *subscriber = sub->subscriber;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100147
Ying Xue13a2e892013-06-17 10:54:40 -0400148 /* The spin lock per subscriber is used to protect its members */
149 spin_lock_bh(&subscriber->lock);
150
Lijun Cheneb409462006-10-16 21:59:42 -0700151 /* Validate timeout (in case subscription is being cancelled) */
Lijun Cheneb409462006-10-16 21:59:42 -0700152 if (sub->timeout == TIPC_WAIT_FOREVER) {
Ying Xue13a2e892013-06-17 10:54:40 -0400153 spin_unlock_bh(&subscriber->lock);
Lijun Cheneb409462006-10-16 21:59:42 -0700154 return;
155 }
156
Per Lidenb97bf3f2006-01-02 19:04:38 +0100157 /* Unlink subscription from name table */
Per Liden4323add2006-01-18 00:38:21 +0100158 tipc_nametbl_unsubscribe(sub);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100159
Allan Stephens28353e72008-05-19 13:29:47 -0700160 /* Unlink subscription from subscriber */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100161 list_del(&sub->subscription_list);
162
Ying Xue13a2e892013-06-17 10:54:40 -0400163 spin_unlock_bh(&subscriber->lock);
Allan Stephens28353e72008-05-19 13:29:47 -0700164
165 /* Notify subscriber of timeout */
Allan Stephens28353e72008-05-19 13:29:47 -0700166 subscr_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper,
167 TIPC_SUBSCR_TIMEOUT, 0, 0);
168
Per Lidenb97bf3f2006-01-02 19:04:38 +0100169 /* Now destroy subscription */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100170 k_term_timer(&sub->timer);
171 kfree(sub);
Ying Xue13a2e892013-06-17 10:54:40 -0400172 atomic_dec(&subscription_count);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100173}
174
175/**
Lijun Cheneb409462006-10-16 21:59:42 -0700176 * subscr_del - delete a subscription within a subscription list
177 *
Ying Xue13a2e892013-06-17 10:54:40 -0400178 * Called with subscriber lock held.
Lijun Cheneb409462006-10-16 21:59:42 -0700179 */
Paul Gortmakerfead3902011-12-29 20:43:44 -0500180static void subscr_del(struct tipc_subscription *sub)
Lijun Cheneb409462006-10-16 21:59:42 -0700181{
182 tipc_nametbl_unsubscribe(sub);
183 list_del(&sub->subscription_list);
184 kfree(sub);
Ying Xue13a2e892013-06-17 10:54:40 -0400185 atomic_dec(&subscription_count);
Lijun Cheneb409462006-10-16 21:59:42 -0700186}
187
188/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100189 * subscr_terminate - terminate communication with a subscriber
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900190 *
Ying Xue13a2e892013-06-17 10:54:40 -0400191 * Note: Must call it in process context since it might sleep.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100192 */
Paul Gortmaker11f99902011-12-29 20:49:39 -0500193static void subscr_terminate(struct tipc_subscriber *subscriber)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100194{
Ying Xue13a2e892013-06-17 10:54:40 -0400195 tipc_conn_terminate(&topsrv, subscriber->conid);
196}
197
198static void subscr_release(struct tipc_subscriber *subscriber)
199{
Paul Gortmakerfead3902011-12-29 20:43:44 -0500200 struct tipc_subscription *sub;
201 struct tipc_subscription *sub_temp;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100202
Ying Xue13a2e892013-06-17 10:54:40 -0400203 spin_lock_bh(&subscriber->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100204
205 /* Destroy any existing subscriptions for subscriber */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100206 list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
207 subscription_list) {
208 if (sub->timeout != TIPC_WAIT_FOREVER) {
Ying Xue13a2e892013-06-17 10:54:40 -0400209 spin_unlock_bh(&subscriber->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100210 k_cancel_timer(&sub->timer);
211 k_term_timer(&sub->timer);
Ying Xue13a2e892013-06-17 10:54:40 -0400212 spin_lock_bh(&subscriber->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100213 }
Lijun Cheneb409462006-10-16 21:59:42 -0700214 subscr_del(sub);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100215 }
Ying Xue13a2e892013-06-17 10:54:40 -0400216 spin_unlock_bh(&subscriber->lock);
Allan Stephens28353e72008-05-19 13:29:47 -0700217
218 /* Now destroy subscriber */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100219 kfree(subscriber);
220}
221
222/**
Lijun Cheneb409462006-10-16 21:59:42 -0700223 * subscr_cancel - handle subscription cancellation request
224 *
Ying Xue13a2e892013-06-17 10:54:40 -0400225 * Called with subscriber lock held. Routine must temporarily release lock
Lijun Cheneb409462006-10-16 21:59:42 -0700226 * to enable the subscription timeout routine to finish without deadlocking;
227 * the lock is then reclaimed to allow caller to release it upon return.
228 *
229 * Note that fields of 's' use subscriber's endianness!
230 */
Lijun Cheneb409462006-10-16 21:59:42 -0700231static void subscr_cancel(struct tipc_subscr *s,
Paul Gortmaker11f99902011-12-29 20:49:39 -0500232 struct tipc_subscriber *subscriber)
Lijun Cheneb409462006-10-16 21:59:42 -0700233{
Paul Gortmakerfead3902011-12-29 20:43:44 -0500234 struct tipc_subscription *sub;
235 struct tipc_subscription *sub_temp;
Lijun Cheneb409462006-10-16 21:59:42 -0700236 int found = 0;
237
238 /* Find first matching subscription, exit if not found */
Lijun Cheneb409462006-10-16 21:59:42 -0700239 list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
240 subscription_list) {
Neil Hormandb5a7532010-10-21 01:06:16 +0000241 if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) {
242 found = 1;
243 break;
244 }
Lijun Cheneb409462006-10-16 21:59:42 -0700245 }
246 if (!found)
247 return;
248
249 /* Cancel subscription timer (if used), then delete subscription */
Lijun Cheneb409462006-10-16 21:59:42 -0700250 if (sub->timeout != TIPC_WAIT_FOREVER) {
251 sub->timeout = TIPC_WAIT_FOREVER;
Ying Xue13a2e892013-06-17 10:54:40 -0400252 spin_unlock_bh(&subscriber->lock);
Lijun Cheneb409462006-10-16 21:59:42 -0700253 k_cancel_timer(&sub->timer);
254 k_term_timer(&sub->timer);
Ying Xue13a2e892013-06-17 10:54:40 -0400255 spin_lock_bh(&subscriber->lock);
Lijun Cheneb409462006-10-16 21:59:42 -0700256 }
Lijun Cheneb409462006-10-16 21:59:42 -0700257 subscr_del(sub);
258}
259
260/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100261 * subscr_subscribe - create subscription for subscriber
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900262 *
Ying Xue13a2e892013-06-17 10:54:40 -0400263 * Called with subscriber lock held.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100264 */
Erik Hugnea5d0e7c2014-03-24 16:56:38 +0100265static int subscr_subscribe(struct tipc_subscr *s,
266 struct tipc_subscriber *subscriber,
267 struct tipc_subscription **sub_p) {
Paul Gortmakerfead3902011-12-29 20:43:44 -0500268 struct tipc_subscription *sub;
Neil Hormandb5a7532010-10-21 01:06:16 +0000269 int swap;
270
271 /* Determine subscriber's endianness */
Neil Hormandb5a7532010-10-21 01:06:16 +0000272 swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE));
Lijun Cheneb409462006-10-16 21:59:42 -0700273
274 /* Detect & process a subscription cancellation request */
Neil Hormandb5a7532010-10-21 01:06:16 +0000275 if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) {
276 s->filter &= ~htohl(TIPC_SUB_CANCEL, swap);
Lijun Cheneb409462006-10-16 21:59:42 -0700277 subscr_cancel(s, subscriber);
Erik Hugnea5d0e7c2014-03-24 16:56:38 +0100278 return 0;
Lijun Cheneb409462006-10-16 21:59:42 -0700279 }
280
Per Lidenb97bf3f2006-01-02 19:04:38 +0100281 /* Refuse subscription if global limit exceeded */
Ying Xue13a2e892013-06-17 10:54:40 -0400282 if (atomic_read(&subscription_count) >= TIPC_MAX_SUBSCRIPTIONS) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400283 pr_warn("Subscription rejected, limit reached (%u)\n",
Ying Xue34f256c2012-08-16 12:09:13 +0000284 TIPC_MAX_SUBSCRIPTIONS);
Erik Hugnea5d0e7c2014-03-24 16:56:38 +0100285 return -EINVAL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100286 }
287
288 /* Allocate subscription object */
Allan Stephens28353e72008-05-19 13:29:47 -0700289 sub = kmalloc(sizeof(*sub), GFP_ATOMIC);
Allan Stephensa10bd922006-06-25 23:52:17 -0700290 if (!sub) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400291 pr_warn("Subscription rejected, no memory\n");
Erik Hugnea5d0e7c2014-03-24 16:56:38 +0100292 return -ENOMEM;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100293 }
294
Per Lidenb97bf3f2006-01-02 19:04:38 +0100295 /* Initialize subscription object */
Neil Hormandb5a7532010-10-21 01:06:16 +0000296 sub->seq.type = htohl(s->seq.type, swap);
297 sub->seq.lower = htohl(s->seq.lower, swap);
298 sub->seq.upper = htohl(s->seq.upper, swap);
299 sub->timeout = htohl(s->timeout, swap);
300 sub->filter = htohl(s->filter, swap);
Neil Horman8c974432010-10-21 01:06:15 +0000301 if ((!(sub->filter & TIPC_SUB_PORTS) ==
302 !(sub->filter & TIPC_SUB_SERVICE)) ||
Joe Perchesf64f9e72009-11-29 16:55:45 -0800303 (sub->seq.lower > sub->seq.upper)) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400304 pr_warn("Subscription rejected, illegal request\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100305 kfree(sub);
Erik Hugnea5d0e7c2014-03-24 16:56:38 +0100306 return -EINVAL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100307 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100308 INIT_LIST_HEAD(&sub->nameseq_list);
309 list_add(&sub->subscription_list, &subscriber->subscription_list);
Ying Xue13a2e892013-06-17 10:54:40 -0400310 sub->subscriber = subscriber;
Neil Hormandb5a7532010-10-21 01:06:16 +0000311 sub->swap = swap;
Allan Stephens28353e72008-05-19 13:29:47 -0700312 memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr));
Ying Xue13a2e892013-06-17 10:54:40 -0400313 atomic_inc(&subscription_count);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100314 if (sub->timeout != TIPC_WAIT_FOREVER) {
315 k_init_timer(&sub->timer,
316 (Handler)subscr_timeout, (unsigned long)sub);
317 k_start_timer(&sub->timer, sub->timeout);
318 }
Erik Hugnea5d0e7c2014-03-24 16:56:38 +0100319 *sub_p = sub;
320 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100321}
322
Ying Xue13a2e892013-06-17 10:54:40 -0400323/* Handle one termination request for the subscriber */
324static void subscr_conn_shutdown_event(int conid, void *usr_data)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100325{
Ying Xue13a2e892013-06-17 10:54:40 -0400326 subscr_release((struct tipc_subscriber *)usr_data);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100327}
328
Ying Xue13a2e892013-06-17 10:54:40 -0400329/* Handle one request to create a new subscription for the subscriber */
330static void subscr_conn_msg_event(int conid, struct sockaddr_tipc *addr,
331 void *usr_data, void *buf, size_t len)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100332{
Ying Xue13a2e892013-06-17 10:54:40 -0400333 struct tipc_subscriber *subscriber = usr_data;
Erik Hugnea5d0e7c2014-03-24 16:56:38 +0100334 struct tipc_subscription *sub = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100335
Ying Xue13a2e892013-06-17 10:54:40 -0400336 spin_lock_bh(&subscriber->lock);
Erik Hugnea5d0e7c2014-03-24 16:56:38 +0100337 if (subscr_subscribe((struct tipc_subscr *)buf, subscriber, &sub) < 0) {
338 spin_unlock_bh(&subscriber->lock);
339 subscr_terminate(subscriber);
340 return;
341 }
Ying Xue13a2e892013-06-17 10:54:40 -0400342 if (sub)
343 tipc_nametbl_subscribe(sub);
344 spin_unlock_bh(&subscriber->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100345}
346
Ying Xue13a2e892013-06-17 10:54:40 -0400347
348/* Handle one request to establish a new subscriber */
349static void *subscr_named_msg_event(int conid)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100350{
Paul Gortmaker11f99902011-12-29 20:49:39 -0500351 struct tipc_subscriber *subscriber;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100352
353 /* Create subscriber object */
Paul Gortmaker11f99902011-12-29 20:49:39 -0500354 subscriber = kzalloc(sizeof(struct tipc_subscriber), GFP_ATOMIC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100355 if (subscriber == NULL) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400356 pr_warn("Subscriber rejected, no memory\n");
Ying Xue13a2e892013-06-17 10:54:40 -0400357 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100358 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100359 INIT_LIST_HEAD(&subscriber->subscription_list);
Ying Xue13a2e892013-06-17 10:54:40 -0400360 subscriber->conid = conid;
361 spin_lock_init(&subscriber->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100362
Ying Xue13a2e892013-06-17 10:54:40 -0400363 return (void *)subscriber;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100364}
365
Per Liden4323add2006-01-18 00:38:21 +0100366int tipc_subscr_start(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100367{
Ying Xue13a2e892013-06-17 10:54:40 -0400368 return tipc_server_start(&topsrv);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100369}
370
Per Liden4323add2006-01-18 00:38:21 +0100371void tipc_subscr_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100372{
Ying Xue13a2e892013-06-17 10:54:40 -0400373 tipc_server_stop(&topsrv);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100374}