Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1 | /* |
Allan Stephens | 5b06c85c | 2008-05-19 13:30:13 -0700 | [diff] [blame] | 2 | * net/tipc/subscr.c: TIPC network topology service |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 3 | * |
Per Liden | 593a5f2 | 2006-01-11 19:14:19 +0100 | [diff] [blame] | 4 | * Copyright (c) 2000-2006, Ericsson AB |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 5 | * Copyright (c) 2005-2007, 2010-2013, Wind River Systems |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 6 | * All rights reserved. |
| 7 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 8 | * Redistribution and use in source and binary forms, with or without |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 9 | * modification, are permitted provided that the following conditions are met: |
| 10 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 11 | * 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 Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 19 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 20 | * 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 Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 34 | * POSSIBILITY OF SUCH DAMAGE. |
| 35 | */ |
| 36 | |
| 37 | #include "core.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 38 | #include "name_table.h" |
Allan Stephens | aa70200 | 2010-12-31 18:59:21 +0000 | [diff] [blame] | 39 | #include "port.h" |
Allan Stephens | 5b06c85c | 2008-05-19 13:30:13 -0700 | [diff] [blame] | 40 | #include "subscr.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 41 | |
| 42 | /** |
Paul Gortmaker | 11f9990 | 2011-12-29 20:49:39 -0500 | [diff] [blame] | 43 | * struct tipc_subscriber - TIPC network topology subscriber |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 44 | * @conid: connection identifier to server connecting to subscriber |
| 45 | * @lock: controll access to subscriber |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 46 | * @subscription_list: list of subscription objects for this subscriber |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 47 | */ |
Paul Gortmaker | 11f9990 | 2011-12-29 20:49:39 -0500 | [diff] [blame] | 48 | struct tipc_subscriber { |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 49 | int conid; |
| 50 | spinlock_t lock; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 51 | struct list_head subscription_list; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 52 | }; |
| 53 | |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 54 | static void subscr_conn_msg_event(int conid, struct sockaddr_tipc *addr, |
| 55 | void *usr_data, void *buf, size_t len); |
| 56 | static void *subscr_named_msg_event(int conid); |
| 57 | static void subscr_conn_shutdown_event(int conid, void *usr_data); |
| 58 | |
| 59 | static atomic_t subscription_count = ATOMIC_INIT(0); |
| 60 | |
| 61 | static 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 Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 68 | }; |
| 69 | |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 70 | static 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 Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 80 | |
| 81 | /** |
Neil Horman | db5a753 | 2010-10-21 01:06:16 +0000 | [diff] [blame] | 82 | * 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 Horman | db5a753 | 2010-10-21 01:06:16 +0000 | [diff] [blame] | 88 | static u32 htohl(u32 in, int swap) |
| 89 | { |
| 90 | return swap ? swab32(in) : in; |
| 91 | } |
| 92 | |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 93 | static void subscr_send_event(struct tipc_subscription *sub, u32 found_lower, |
| 94 | u32 found_upper, u32 event, u32 port_ref, |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 95 | u32 node) |
| 96 | { |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 97 | struct tipc_subscriber *subscriber = sub->subscriber; |
| 98 | struct kvec msg_sect; |
| 99 | int ret; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 100 | |
| 101 | msg_sect.iov_base = (void *)&sub->evt; |
| 102 | msg_sect.iov_len = sizeof(struct tipc_event); |
| 103 | |
Neil Horman | db5a753 | 2010-10-21 01:06:16 +0000 | [diff] [blame] | 104 | 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 Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 109 | 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 Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 113 | } |
| 114 | |
| 115 | /** |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 116 | * tipc_subscr_overlap - test for subscription overlap with the given values |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 117 | * |
| 118 | * Returns 1 if there is overlap, otherwise 0. |
| 119 | */ |
Paul Gortmaker | fead390 | 2011-12-29 20:43:44 -0500 | [diff] [blame] | 120 | int tipc_subscr_overlap(struct tipc_subscription *sub, |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 121 | u32 found_lower, |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 122 | u32 found_upper) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 123 | |
| 124 | { |
| 125 | if (found_lower < sub->seq.lower) |
| 126 | found_lower = sub->seq.lower; |
| 127 | if (found_upper > sub->seq.upper) |
| 128 | found_upper = sub->seq.upper; |
| 129 | if (found_lower > found_upper) |
| 130 | return 0; |
| 131 | return 1; |
| 132 | } |
| 133 | |
| 134 | /** |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 135 | * tipc_subscr_report_overlap - issue event if there is subscription overlap |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 136 | * |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 137 | * Protected by nameseq.lock in name_table.c |
| 138 | */ |
Paul Gortmaker | fead390 | 2011-12-29 20:43:44 -0500 | [diff] [blame] | 139 | void tipc_subscr_report_overlap(struct tipc_subscription *sub, |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 140 | u32 found_lower, |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 141 | u32 found_upper, |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 142 | u32 event, |
| 143 | u32 port_ref, |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 144 | u32 node, |
| 145 | int must) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 146 | { |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 147 | if (!tipc_subscr_overlap(sub, found_lower, found_upper)) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 148 | return; |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 149 | if (!must && !(sub->filter & TIPC_SUB_PORTS)) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 150 | return; |
Allan Stephens | e15f880 | 2008-05-19 13:27:31 -0700 | [diff] [blame] | 151 | |
Ying Xue | 7e24477 | 2011-07-19 04:21:56 -0400 | [diff] [blame] | 152 | subscr_send_event(sub, found_lower, found_upper, event, port_ref, node); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 153 | } |
| 154 | |
Paul Gortmaker | fead390 | 2011-12-29 20:43:44 -0500 | [diff] [blame] | 155 | static void subscr_timeout(struct tipc_subscription *sub) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 156 | { |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 157 | struct tipc_subscriber *subscriber = sub->subscriber; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 158 | |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 159 | /* The spin lock per subscriber is used to protect its members */ |
| 160 | spin_lock_bh(&subscriber->lock); |
| 161 | |
| 162 | /* Validate if the connection related to the subscriber is |
| 163 | * closed (in case subscriber is terminating) |
| 164 | */ |
| 165 | if (subscriber->conid == 0) { |
| 166 | spin_unlock_bh(&subscriber->lock); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 167 | return; |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 168 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 169 | |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 170 | /* Validate timeout (in case subscription is being cancelled) */ |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 171 | if (sub->timeout == TIPC_WAIT_FOREVER) { |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 172 | spin_unlock_bh(&subscriber->lock); |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 173 | return; |
| 174 | } |
| 175 | |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 176 | /* Unlink subscription from name table */ |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 177 | tipc_nametbl_unsubscribe(sub); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 178 | |
Allan Stephens | 28353e7 | 2008-05-19 13:29:47 -0700 | [diff] [blame] | 179 | /* Unlink subscription from subscriber */ |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 180 | list_del(&sub->subscription_list); |
| 181 | |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 182 | spin_unlock_bh(&subscriber->lock); |
Allan Stephens | 28353e7 | 2008-05-19 13:29:47 -0700 | [diff] [blame] | 183 | |
| 184 | /* Notify subscriber of timeout */ |
Allan Stephens | 28353e7 | 2008-05-19 13:29:47 -0700 | [diff] [blame] | 185 | subscr_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper, |
| 186 | TIPC_SUBSCR_TIMEOUT, 0, 0); |
| 187 | |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 188 | /* Now destroy subscription */ |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 189 | k_term_timer(&sub->timer); |
| 190 | kfree(sub); |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 191 | atomic_dec(&subscription_count); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 192 | } |
| 193 | |
| 194 | /** |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 195 | * subscr_del - delete a subscription within a subscription list |
| 196 | * |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 197 | * Called with subscriber lock held. |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 198 | */ |
Paul Gortmaker | fead390 | 2011-12-29 20:43:44 -0500 | [diff] [blame] | 199 | static void subscr_del(struct tipc_subscription *sub) |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 200 | { |
| 201 | tipc_nametbl_unsubscribe(sub); |
| 202 | list_del(&sub->subscription_list); |
| 203 | kfree(sub); |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 204 | atomic_dec(&subscription_count); |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | /** |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 208 | * subscr_terminate - terminate communication with a subscriber |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 209 | * |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 210 | * Note: Must call it in process context since it might sleep. |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 211 | */ |
Paul Gortmaker | 11f9990 | 2011-12-29 20:49:39 -0500 | [diff] [blame] | 212 | static void subscr_terminate(struct tipc_subscriber *subscriber) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 213 | { |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 214 | tipc_conn_terminate(&topsrv, subscriber->conid); |
| 215 | } |
| 216 | |
| 217 | static void subscr_release(struct tipc_subscriber *subscriber) |
| 218 | { |
Paul Gortmaker | fead390 | 2011-12-29 20:43:44 -0500 | [diff] [blame] | 219 | struct tipc_subscription *sub; |
| 220 | struct tipc_subscription *sub_temp; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 221 | |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 222 | spin_lock_bh(&subscriber->lock); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 223 | |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 224 | /* Invalidate subscriber reference */ |
| 225 | subscriber->conid = 0; |
Allan Stephens | 28353e7 | 2008-05-19 13:29:47 -0700 | [diff] [blame] | 226 | |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 227 | /* Destroy any existing subscriptions for subscriber */ |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 228 | list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list, |
| 229 | subscription_list) { |
| 230 | if (sub->timeout != TIPC_WAIT_FOREVER) { |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 231 | spin_unlock_bh(&subscriber->lock); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 232 | k_cancel_timer(&sub->timer); |
| 233 | k_term_timer(&sub->timer); |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 234 | spin_lock_bh(&subscriber->lock); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 235 | } |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 236 | subscr_del(sub); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 237 | } |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 238 | spin_unlock_bh(&subscriber->lock); |
Allan Stephens | 28353e7 | 2008-05-19 13:29:47 -0700 | [diff] [blame] | 239 | |
| 240 | /* Now destroy subscriber */ |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 241 | kfree(subscriber); |
| 242 | } |
| 243 | |
| 244 | /** |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 245 | * subscr_cancel - handle subscription cancellation request |
| 246 | * |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 247 | * Called with subscriber lock held. Routine must temporarily release lock |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 248 | * to enable the subscription timeout routine to finish without deadlocking; |
| 249 | * the lock is then reclaimed to allow caller to release it upon return. |
| 250 | * |
| 251 | * Note that fields of 's' use subscriber's endianness! |
| 252 | */ |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 253 | static void subscr_cancel(struct tipc_subscr *s, |
Paul Gortmaker | 11f9990 | 2011-12-29 20:49:39 -0500 | [diff] [blame] | 254 | struct tipc_subscriber *subscriber) |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 255 | { |
Paul Gortmaker | fead390 | 2011-12-29 20:43:44 -0500 | [diff] [blame] | 256 | struct tipc_subscription *sub; |
| 257 | struct tipc_subscription *sub_temp; |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 258 | int found = 0; |
| 259 | |
| 260 | /* Find first matching subscription, exit if not found */ |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 261 | list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list, |
| 262 | subscription_list) { |
Neil Horman | db5a753 | 2010-10-21 01:06:16 +0000 | [diff] [blame] | 263 | if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) { |
| 264 | found = 1; |
| 265 | break; |
| 266 | } |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 267 | } |
| 268 | if (!found) |
| 269 | return; |
| 270 | |
| 271 | /* Cancel subscription timer (if used), then delete subscription */ |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 272 | if (sub->timeout != TIPC_WAIT_FOREVER) { |
| 273 | sub->timeout = TIPC_WAIT_FOREVER; |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 274 | spin_unlock_bh(&subscriber->lock); |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 275 | k_cancel_timer(&sub->timer); |
| 276 | k_term_timer(&sub->timer); |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 277 | spin_lock_bh(&subscriber->lock); |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 278 | } |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 279 | subscr_del(sub); |
| 280 | } |
| 281 | |
| 282 | /** |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 283 | * subscr_subscribe - create subscription for subscriber |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 284 | * |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 285 | * Called with subscriber lock held. |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 286 | */ |
Paul Gortmaker | fead390 | 2011-12-29 20:43:44 -0500 | [diff] [blame] | 287 | static struct tipc_subscription *subscr_subscribe(struct tipc_subscr *s, |
Paul Gortmaker | 11f9990 | 2011-12-29 20:49:39 -0500 | [diff] [blame] | 288 | struct tipc_subscriber *subscriber) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 289 | { |
Paul Gortmaker | fead390 | 2011-12-29 20:43:44 -0500 | [diff] [blame] | 290 | struct tipc_subscription *sub; |
Neil Horman | db5a753 | 2010-10-21 01:06:16 +0000 | [diff] [blame] | 291 | int swap; |
| 292 | |
| 293 | /* Determine subscriber's endianness */ |
Neil Horman | db5a753 | 2010-10-21 01:06:16 +0000 | [diff] [blame] | 294 | swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE)); |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 295 | |
| 296 | /* Detect & process a subscription cancellation request */ |
Neil Horman | db5a753 | 2010-10-21 01:06:16 +0000 | [diff] [blame] | 297 | if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) { |
| 298 | s->filter &= ~htohl(TIPC_SUB_CANCEL, swap); |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 299 | subscr_cancel(s, subscriber); |
Allan Stephens | 28353e7 | 2008-05-19 13:29:47 -0700 | [diff] [blame] | 300 | return NULL; |
Lijun Chen | eb40946 | 2006-10-16 21:59:42 -0700 | [diff] [blame] | 301 | } |
| 302 | |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 303 | /* Refuse subscription if global limit exceeded */ |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 304 | if (atomic_read(&subscription_count) >= TIPC_MAX_SUBSCRIPTIONS) { |
Erik Hugne | 2cf8aa1 | 2012-06-29 00:16:37 -0400 | [diff] [blame] | 305 | pr_warn("Subscription rejected, limit reached (%u)\n", |
Ying Xue | 34f256c | 2012-08-16 12:09:13 +0000 | [diff] [blame] | 306 | TIPC_MAX_SUBSCRIPTIONS); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 307 | subscr_terminate(subscriber); |
Allan Stephens | 28353e7 | 2008-05-19 13:29:47 -0700 | [diff] [blame] | 308 | return NULL; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 309 | } |
| 310 | |
| 311 | /* Allocate subscription object */ |
Allan Stephens | 28353e7 | 2008-05-19 13:29:47 -0700 | [diff] [blame] | 312 | sub = kmalloc(sizeof(*sub), GFP_ATOMIC); |
Allan Stephens | a10bd92 | 2006-06-25 23:52:17 -0700 | [diff] [blame] | 313 | if (!sub) { |
Erik Hugne | 2cf8aa1 | 2012-06-29 00:16:37 -0400 | [diff] [blame] | 314 | pr_warn("Subscription rejected, no memory\n"); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 315 | subscr_terminate(subscriber); |
Allan Stephens | 28353e7 | 2008-05-19 13:29:47 -0700 | [diff] [blame] | 316 | return NULL; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 317 | } |
| 318 | |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 319 | /* Initialize subscription object */ |
Neil Horman | db5a753 | 2010-10-21 01:06:16 +0000 | [diff] [blame] | 320 | sub->seq.type = htohl(s->seq.type, swap); |
| 321 | sub->seq.lower = htohl(s->seq.lower, swap); |
| 322 | sub->seq.upper = htohl(s->seq.upper, swap); |
| 323 | sub->timeout = htohl(s->timeout, swap); |
| 324 | sub->filter = htohl(s->filter, swap); |
Neil Horman | 8c97443 | 2010-10-21 01:06:15 +0000 | [diff] [blame] | 325 | if ((!(sub->filter & TIPC_SUB_PORTS) == |
| 326 | !(sub->filter & TIPC_SUB_SERVICE)) || |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 327 | (sub->seq.lower > sub->seq.upper)) { |
Erik Hugne | 2cf8aa1 | 2012-06-29 00:16:37 -0400 | [diff] [blame] | 328 | pr_warn("Subscription rejected, illegal request\n"); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 329 | kfree(sub); |
| 330 | subscr_terminate(subscriber); |
Allan Stephens | 28353e7 | 2008-05-19 13:29:47 -0700 | [diff] [blame] | 331 | return NULL; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 332 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 333 | INIT_LIST_HEAD(&sub->nameseq_list); |
| 334 | list_add(&sub->subscription_list, &subscriber->subscription_list); |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 335 | sub->subscriber = subscriber; |
Neil Horman | db5a753 | 2010-10-21 01:06:16 +0000 | [diff] [blame] | 336 | sub->swap = swap; |
Allan Stephens | 28353e7 | 2008-05-19 13:29:47 -0700 | [diff] [blame] | 337 | memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr)); |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 338 | atomic_inc(&subscription_count); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 339 | if (sub->timeout != TIPC_WAIT_FOREVER) { |
| 340 | k_init_timer(&sub->timer, |
| 341 | (Handler)subscr_timeout, (unsigned long)sub); |
| 342 | k_start_timer(&sub->timer, sub->timeout); |
| 343 | } |
Allan Stephens | 28353e7 | 2008-05-19 13:29:47 -0700 | [diff] [blame] | 344 | |
| 345 | return sub; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 346 | } |
| 347 | |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 348 | /* Handle one termination request for the subscriber */ |
| 349 | static void subscr_conn_shutdown_event(int conid, void *usr_data) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 350 | { |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 351 | subscr_release((struct tipc_subscriber *)usr_data); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 352 | } |
| 353 | |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 354 | /* Handle one request to create a new subscription for the subscriber */ |
| 355 | static void subscr_conn_msg_event(int conid, struct sockaddr_tipc *addr, |
| 356 | void *usr_data, void *buf, size_t len) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 357 | { |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 358 | struct tipc_subscriber *subscriber = usr_data; |
Paul Gortmaker | fead390 | 2011-12-29 20:43:44 -0500 | [diff] [blame] | 359 | struct tipc_subscription *sub; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 360 | |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 361 | spin_lock_bh(&subscriber->lock); |
| 362 | sub = subscr_subscribe((struct tipc_subscr *)buf, subscriber); |
| 363 | if (sub) |
| 364 | tipc_nametbl_subscribe(sub); |
| 365 | spin_unlock_bh(&subscriber->lock); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 366 | } |
| 367 | |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 368 | |
| 369 | /* Handle one request to establish a new subscriber */ |
| 370 | static void *subscr_named_msg_event(int conid) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 371 | { |
Paul Gortmaker | 11f9990 | 2011-12-29 20:49:39 -0500 | [diff] [blame] | 372 | struct tipc_subscriber *subscriber; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 373 | |
| 374 | /* Create subscriber object */ |
Paul Gortmaker | 11f9990 | 2011-12-29 20:49:39 -0500 | [diff] [blame] | 375 | subscriber = kzalloc(sizeof(struct tipc_subscriber), GFP_ATOMIC); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 376 | if (subscriber == NULL) { |
Erik Hugne | 2cf8aa1 | 2012-06-29 00:16:37 -0400 | [diff] [blame] | 377 | pr_warn("Subscriber rejected, no memory\n"); |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 378 | return NULL; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 379 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 380 | INIT_LIST_HEAD(&subscriber->subscription_list); |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 381 | subscriber->conid = conid; |
| 382 | spin_lock_init(&subscriber->lock); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 383 | |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 384 | return (void *)subscriber; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 385 | } |
| 386 | |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 387 | int tipc_subscr_start(void) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 388 | { |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 389 | return tipc_server_start(&topsrv); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 390 | } |
| 391 | |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 392 | void tipc_subscr_stop(void) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 393 | { |
Ying Xue | 13a2e89 | 2013-06-17 10:54:40 -0400 | [diff] [blame^] | 394 | tipc_server_stop(&topsrv); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 395 | } |