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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 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/**
Paul Gortmaker11f99902011-12-29 20:49:39 -050043 * struct tipc_subscriber - TIPC network topology subscriber
Ying Xue13a2e892013-06-17 10:54:40 -040044 * @conid: connection identifier to server connecting to subscriber
45 * @lock: controll access to subscriber
Per Lidenb97bf3f2006-01-02 19:04:38 +010046 * @subscription_list: list of subscription objects for this subscriber
Per Lidenb97bf3f2006-01-02 19:04:38 +010047 */
Paul Gortmaker11f99902011-12-29 20:49:39 -050048struct tipc_subscriber {
Ying Xue13a2e892013-06-17 10:54:40 -040049 int conid;
50 spinlock_t lock;
Per Lidenb97bf3f2006-01-02 19:04:38 +010051 struct list_head subscription_list;
Per Lidenb97bf3f2006-01-02 19:04:38 +010052};
53
Ying Xue13a2e892013-06-17 10:54:40 -040054static void subscr_conn_msg_event(int conid, struct sockaddr_tipc *addr,
55 void *usr_data, void *buf, size_t len);
56static void *subscr_named_msg_event(int conid);
57static void subscr_conn_shutdown_event(int conid, void *usr_data);
58
59static atomic_t subscription_count = ATOMIC_INIT(0);
60
61static struct sockaddr_tipc topsrv_addr __read_mostly = {
62 .family = AF_TIPC,
63 .addrtype = TIPC_ADDR_NAMESEQ,
64 .addr.nameseq.type = TIPC_TOP_SRV,
65 .addr.nameseq.lower = TIPC_TOP_SRV,
66 .addr.nameseq.upper = TIPC_TOP_SRV,
67 .scope = TIPC_NODE_SCOPE
Per Lidenb97bf3f2006-01-02 19:04:38 +010068};
69
Ying Xue13a2e892013-06-17 10:54:40 -040070static struct tipc_server topsrv __read_mostly = {
71 .saddr = &topsrv_addr,
72 .imp = TIPC_CRITICAL_IMPORTANCE,
73 .type = SOCK_SEQPACKET,
74 .max_rcvbuf_size = sizeof(struct tipc_subscr),
75 .name = "topology_server",
76 .tipc_conn_recvmsg = subscr_conn_msg_event,
77 .tipc_conn_new = subscr_named_msg_event,
78 .tipc_conn_shutdown = subscr_conn_shutdown_event,
79};
Per Lidenb97bf3f2006-01-02 19:04:38 +010080
81/**
Neil Hormandb5a7532010-10-21 01:06:16 +000082 * htohl - convert value to endianness used by destination
83 * @in: value to convert
84 * @swap: non-zero if endianness must be reversed
85 *
86 * Returns converted value
87 */
Neil Hormandb5a7532010-10-21 01:06:16 +000088static u32 htohl(u32 in, int swap)
89{
90 return swap ? swab32(in) : in;
91}
92
Ying Xue13a2e892013-06-17 10:54:40 -040093static void subscr_send_event(struct tipc_subscription *sub, u32 found_lower,
94 u32 found_upper, u32 event, u32 port_ref,
Per Lidenb97bf3f2006-01-02 19:04:38 +010095 u32 node)
96{
Ying Xue13a2e892013-06-17 10:54:40 -040097 struct tipc_subscriber *subscriber = sub->subscriber;
98 struct kvec msg_sect;
99 int ret;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100100
101 msg_sect.iov_base = (void *)&sub->evt;
102 msg_sect.iov_len = sizeof(struct tipc_event);
103
Neil Hormandb5a7532010-10-21 01:06:16 +0000104 sub->evt.event = htohl(event, sub->swap);
105 sub->evt.found_lower = htohl(found_lower, sub->swap);
106 sub->evt.found_upper = htohl(found_upper, sub->swap);
107 sub->evt.port.ref = htohl(port_ref, sub->swap);
108 sub->evt.port.node = htohl(node, sub->swap);
Ying Xue13a2e892013-06-17 10:54:40 -0400109 ret = tipc_conn_sendmsg(&topsrv, subscriber->conid, NULL,
110 msg_sect.iov_base, msg_sect.iov_len);
111 if (ret < 0)
112 pr_err("Sending subscription event failed, no memory\n");
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 */
Paul Gortmakerae8509c2013-06-17 10:54:47 -0400120int tipc_subscr_overlap(struct tipc_subscription *sub, u32 found_lower,
Per Liden4323add2006-01-18 00:38:21 +0100121 u32 found_upper)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100122{
123 if (found_lower < sub->seq.lower)
124 found_lower = sub->seq.lower;
125 if (found_upper > sub->seq.upper)
126 found_upper = sub->seq.upper;
127 if (found_lower > found_upper)
128 return 0;
129 return 1;
130}
131
132/**
Per Liden4323add2006-01-18 00:38:21 +0100133 * tipc_subscr_report_overlap - issue event if there is subscription overlap
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900134 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100135 * Protected by nameseq.lock in name_table.c
136 */
Paul Gortmakerae8509c2013-06-17 10:54:47 -0400137void tipc_subscr_report_overlap(struct tipc_subscription *sub, u32 found_lower,
138 u32 found_upper, u32 event, u32 port_ref,
139 u32 node, int must)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100140{
Per Liden4323add2006-01-18 00:38:21 +0100141 if (!tipc_subscr_overlap(sub, found_lower, found_upper))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100142 return;
Lijun Cheneb409462006-10-16 21:59:42 -0700143 if (!must && !(sub->filter & TIPC_SUB_PORTS))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100144 return;
Allan Stephense15f8802008-05-19 13:27:31 -0700145
Ying Xue7e244772011-07-19 04:21:56 -0400146 subscr_send_event(sub, found_lower, found_upper, event, port_ref, node);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100147}
148
Paul Gortmakerfead3902011-12-29 20:43:44 -0500149static void subscr_timeout(struct tipc_subscription *sub)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100150{
Ying Xue13a2e892013-06-17 10:54:40 -0400151 struct tipc_subscriber *subscriber = sub->subscriber;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100152
Ying Xue13a2e892013-06-17 10:54:40 -0400153 /* The spin lock per subscriber is used to protect its members */
154 spin_lock_bh(&subscriber->lock);
155
156 /* Validate if the connection related to the subscriber is
157 * closed (in case subscriber is terminating)
158 */
159 if (subscriber->conid == 0) {
160 spin_unlock_bh(&subscriber->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100161 return;
Ying Xue13a2e892013-06-17 10:54:40 -0400162 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100163
Lijun Cheneb409462006-10-16 21:59:42 -0700164 /* Validate timeout (in case subscription is being cancelled) */
Lijun Cheneb409462006-10-16 21:59:42 -0700165 if (sub->timeout == TIPC_WAIT_FOREVER) {
Ying Xue13a2e892013-06-17 10:54:40 -0400166 spin_unlock_bh(&subscriber->lock);
Lijun Cheneb409462006-10-16 21:59:42 -0700167 return;
168 }
169
Per Lidenb97bf3f2006-01-02 19:04:38 +0100170 /* Unlink subscription from name table */
Per Liden4323add2006-01-18 00:38:21 +0100171 tipc_nametbl_unsubscribe(sub);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100172
Allan Stephens28353e72008-05-19 13:29:47 -0700173 /* Unlink subscription from subscriber */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100174 list_del(&sub->subscription_list);
175
Ying Xue13a2e892013-06-17 10:54:40 -0400176 spin_unlock_bh(&subscriber->lock);
Allan Stephens28353e72008-05-19 13:29:47 -0700177
178 /* Notify subscriber of timeout */
Allan Stephens28353e72008-05-19 13:29:47 -0700179 subscr_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper,
180 TIPC_SUBSCR_TIMEOUT, 0, 0);
181
Per Lidenb97bf3f2006-01-02 19:04:38 +0100182 /* Now destroy subscription */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100183 k_term_timer(&sub->timer);
184 kfree(sub);
Ying Xue13a2e892013-06-17 10:54:40 -0400185 atomic_dec(&subscription_count);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100186}
187
188/**
Lijun Cheneb409462006-10-16 21:59:42 -0700189 * subscr_del - delete a subscription within a subscription list
190 *
Ying Xue13a2e892013-06-17 10:54:40 -0400191 * Called with subscriber lock held.
Lijun Cheneb409462006-10-16 21:59:42 -0700192 */
Paul Gortmakerfead3902011-12-29 20:43:44 -0500193static void subscr_del(struct tipc_subscription *sub)
Lijun Cheneb409462006-10-16 21:59:42 -0700194{
195 tipc_nametbl_unsubscribe(sub);
196 list_del(&sub->subscription_list);
197 kfree(sub);
Ying Xue13a2e892013-06-17 10:54:40 -0400198 atomic_dec(&subscription_count);
Lijun Cheneb409462006-10-16 21:59:42 -0700199}
200
201/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100202 * subscr_terminate - terminate communication with a subscriber
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900203 *
Ying Xue13a2e892013-06-17 10:54:40 -0400204 * Note: Must call it in process context since it might sleep.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100205 */
Paul Gortmaker11f99902011-12-29 20:49:39 -0500206static void subscr_terminate(struct tipc_subscriber *subscriber)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100207{
Ying Xue13a2e892013-06-17 10:54:40 -0400208 tipc_conn_terminate(&topsrv, subscriber->conid);
209}
210
211static void subscr_release(struct tipc_subscriber *subscriber)
212{
Paul Gortmakerfead3902011-12-29 20:43:44 -0500213 struct tipc_subscription *sub;
214 struct tipc_subscription *sub_temp;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100215
Ying Xue13a2e892013-06-17 10:54:40 -0400216 spin_lock_bh(&subscriber->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100217
Ying Xue13a2e892013-06-17 10:54:40 -0400218 /* Invalidate subscriber reference */
219 subscriber->conid = 0;
Allan Stephens28353e72008-05-19 13:29:47 -0700220
Per Lidenb97bf3f2006-01-02 19:04:38 +0100221 /* Destroy any existing subscriptions for subscriber */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100222 list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
223 subscription_list) {
224 if (sub->timeout != TIPC_WAIT_FOREVER) {
Ying Xue13a2e892013-06-17 10:54:40 -0400225 spin_unlock_bh(&subscriber->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100226 k_cancel_timer(&sub->timer);
227 k_term_timer(&sub->timer);
Ying Xue13a2e892013-06-17 10:54:40 -0400228 spin_lock_bh(&subscriber->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100229 }
Lijun Cheneb409462006-10-16 21:59:42 -0700230 subscr_del(sub);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100231 }
Ying Xue13a2e892013-06-17 10:54:40 -0400232 spin_unlock_bh(&subscriber->lock);
Allan Stephens28353e72008-05-19 13:29:47 -0700233
234 /* Now destroy subscriber */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100235 kfree(subscriber);
236}
237
238/**
Lijun Cheneb409462006-10-16 21:59:42 -0700239 * subscr_cancel - handle subscription cancellation request
240 *
Ying Xue13a2e892013-06-17 10:54:40 -0400241 * Called with subscriber lock held. Routine must temporarily release lock
Lijun Cheneb409462006-10-16 21:59:42 -0700242 * to enable the subscription timeout routine to finish without deadlocking;
243 * the lock is then reclaimed to allow caller to release it upon return.
244 *
245 * Note that fields of 's' use subscriber's endianness!
246 */
Lijun Cheneb409462006-10-16 21:59:42 -0700247static void subscr_cancel(struct tipc_subscr *s,
Paul Gortmaker11f99902011-12-29 20:49:39 -0500248 struct tipc_subscriber *subscriber)
Lijun Cheneb409462006-10-16 21:59:42 -0700249{
Paul Gortmakerfead3902011-12-29 20:43:44 -0500250 struct tipc_subscription *sub;
251 struct tipc_subscription *sub_temp;
Lijun Cheneb409462006-10-16 21:59:42 -0700252 int found = 0;
253
254 /* Find first matching subscription, exit if not found */
Lijun Cheneb409462006-10-16 21:59:42 -0700255 list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
256 subscription_list) {
Neil Hormandb5a7532010-10-21 01:06:16 +0000257 if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) {
258 found = 1;
259 break;
260 }
Lijun Cheneb409462006-10-16 21:59:42 -0700261 }
262 if (!found)
263 return;
264
265 /* Cancel subscription timer (if used), then delete subscription */
Lijun Cheneb409462006-10-16 21:59:42 -0700266 if (sub->timeout != TIPC_WAIT_FOREVER) {
267 sub->timeout = TIPC_WAIT_FOREVER;
Ying Xue13a2e892013-06-17 10:54:40 -0400268 spin_unlock_bh(&subscriber->lock);
Lijun Cheneb409462006-10-16 21:59:42 -0700269 k_cancel_timer(&sub->timer);
270 k_term_timer(&sub->timer);
Ying Xue13a2e892013-06-17 10:54:40 -0400271 spin_lock_bh(&subscriber->lock);
Lijun Cheneb409462006-10-16 21:59:42 -0700272 }
Lijun Cheneb409462006-10-16 21:59:42 -0700273 subscr_del(sub);
274}
275
276/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100277 * subscr_subscribe - create subscription for subscriber
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900278 *
Ying Xue13a2e892013-06-17 10:54:40 -0400279 * Called with subscriber lock held.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100280 */
Paul Gortmakerfead3902011-12-29 20:43:44 -0500281static struct tipc_subscription *subscr_subscribe(struct tipc_subscr *s,
Paul Gortmaker11f99902011-12-29 20:49:39 -0500282 struct tipc_subscriber *subscriber)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100283{
Paul Gortmakerfead3902011-12-29 20:43:44 -0500284 struct tipc_subscription *sub;
Neil Hormandb5a7532010-10-21 01:06:16 +0000285 int swap;
286
287 /* Determine subscriber's endianness */
Neil Hormandb5a7532010-10-21 01:06:16 +0000288 swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE));
Lijun Cheneb409462006-10-16 21:59:42 -0700289
290 /* Detect & process a subscription cancellation request */
Neil Hormandb5a7532010-10-21 01:06:16 +0000291 if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) {
292 s->filter &= ~htohl(TIPC_SUB_CANCEL, swap);
Lijun Cheneb409462006-10-16 21:59:42 -0700293 subscr_cancel(s, subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700294 return NULL;
Lijun Cheneb409462006-10-16 21:59:42 -0700295 }
296
Per Lidenb97bf3f2006-01-02 19:04:38 +0100297 /* Refuse subscription if global limit exceeded */
Ying Xue13a2e892013-06-17 10:54:40 -0400298 if (atomic_read(&subscription_count) >= TIPC_MAX_SUBSCRIPTIONS) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400299 pr_warn("Subscription rejected, limit reached (%u)\n",
Ying Xue34f256c2012-08-16 12:09:13 +0000300 TIPC_MAX_SUBSCRIPTIONS);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100301 subscr_terminate(subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700302 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100303 }
304
305 /* Allocate subscription object */
Allan Stephens28353e72008-05-19 13:29:47 -0700306 sub = kmalloc(sizeof(*sub), GFP_ATOMIC);
Allan Stephensa10bd922006-06-25 23:52:17 -0700307 if (!sub) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400308 pr_warn("Subscription rejected, no memory\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100309 subscr_terminate(subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700310 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100311 }
312
Per Lidenb97bf3f2006-01-02 19:04:38 +0100313 /* Initialize subscription object */
Neil Hormandb5a7532010-10-21 01:06:16 +0000314 sub->seq.type = htohl(s->seq.type, swap);
315 sub->seq.lower = htohl(s->seq.lower, swap);
316 sub->seq.upper = htohl(s->seq.upper, swap);
317 sub->timeout = htohl(s->timeout, swap);
318 sub->filter = htohl(s->filter, swap);
Neil Horman8c974432010-10-21 01:06:15 +0000319 if ((!(sub->filter & TIPC_SUB_PORTS) ==
320 !(sub->filter & TIPC_SUB_SERVICE)) ||
Joe Perchesf64f9e72009-11-29 16:55:45 -0800321 (sub->seq.lower > sub->seq.upper)) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400322 pr_warn("Subscription rejected, illegal request\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100323 kfree(sub);
324 subscr_terminate(subscriber);
Allan Stephens28353e72008-05-19 13:29:47 -0700325 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100326 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100327 INIT_LIST_HEAD(&sub->nameseq_list);
328 list_add(&sub->subscription_list, &subscriber->subscription_list);
Ying Xue13a2e892013-06-17 10:54:40 -0400329 sub->subscriber = subscriber;
Neil Hormandb5a7532010-10-21 01:06:16 +0000330 sub->swap = swap;
Allan Stephens28353e72008-05-19 13:29:47 -0700331 memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr));
Ying Xue13a2e892013-06-17 10:54:40 -0400332 atomic_inc(&subscription_count);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100333 if (sub->timeout != TIPC_WAIT_FOREVER) {
334 k_init_timer(&sub->timer,
335 (Handler)subscr_timeout, (unsigned long)sub);
336 k_start_timer(&sub->timer, sub->timeout);
337 }
Allan Stephens28353e72008-05-19 13:29:47 -0700338
339 return sub;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100340}
341
Ying Xue13a2e892013-06-17 10:54:40 -0400342/* Handle one termination request for the subscriber */
343static void subscr_conn_shutdown_event(int conid, void *usr_data)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100344{
Ying Xue13a2e892013-06-17 10:54:40 -0400345 subscr_release((struct tipc_subscriber *)usr_data);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100346}
347
Ying Xue13a2e892013-06-17 10:54:40 -0400348/* Handle one request to create a new subscription for the subscriber */
349static void subscr_conn_msg_event(int conid, struct sockaddr_tipc *addr,
350 void *usr_data, void *buf, size_t len)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100351{
Ying Xue13a2e892013-06-17 10:54:40 -0400352 struct tipc_subscriber *subscriber = usr_data;
Paul Gortmakerfead3902011-12-29 20:43:44 -0500353 struct tipc_subscription *sub;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100354
Ying Xue13a2e892013-06-17 10:54:40 -0400355 spin_lock_bh(&subscriber->lock);
356 sub = subscr_subscribe((struct tipc_subscr *)buf, subscriber);
357 if (sub)
358 tipc_nametbl_subscribe(sub);
359 spin_unlock_bh(&subscriber->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100360}
361
Ying Xue13a2e892013-06-17 10:54:40 -0400362
363/* Handle one request to establish a new subscriber */
364static void *subscr_named_msg_event(int conid)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100365{
Paul Gortmaker11f99902011-12-29 20:49:39 -0500366 struct tipc_subscriber *subscriber;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100367
368 /* Create subscriber object */
Paul Gortmaker11f99902011-12-29 20:49:39 -0500369 subscriber = kzalloc(sizeof(struct tipc_subscriber), GFP_ATOMIC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100370 if (subscriber == NULL) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400371 pr_warn("Subscriber rejected, no memory\n");
Ying Xue13a2e892013-06-17 10:54:40 -0400372 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100373 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100374 INIT_LIST_HEAD(&subscriber->subscription_list);
Ying Xue13a2e892013-06-17 10:54:40 -0400375 subscriber->conid = conid;
376 spin_lock_init(&subscriber->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100377
Ying Xue13a2e892013-06-17 10:54:40 -0400378 return (void *)subscriber;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100379}
380
Per Liden4323add2006-01-18 00:38:21 +0100381int tipc_subscr_start(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100382{
Ying Xue13a2e892013-06-17 10:54:40 -0400383 return tipc_server_start(&topsrv);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100384}
385
Per Liden4323add2006-01-18 00:38:21 +0100386void tipc_subscr_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100387{
Ying Xue13a2e892013-06-17 10:54:40 -0400388 tipc_server_stop(&topsrv);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100389}