net/tipc/core.c

   1 /*
   2  * net/tipc/core.c: TIPC module code
   3  *
   4  * Copyright (c) 2003-2006, Ericsson AB
   5  * Copyright (c) 2005, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  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.
  19  *
  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
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include <linux/init.h>
  38 #include <linux/module.h>
  39 #include <linux/kernel.h>
  40 #include <linux/random.h>
  41
  42 #include "core.h"
  43 #include "dbg.h"
  44 #include "ref.h"
  45 #include "net.h"
  46 #include "user_reg.h"
  47 #include "name_table.h"
  48 #include "subscr.h"
  49 #include "config.h"
  50
  51 int  tipc_eth_media_start(void);
  52 void tipc_eth_media_stop(void);
  53 int  tipc_handler_start(void);
  54 void tipc_handler_stop(void);
  55 int  tipc_socket_init(void);
  56 void tipc_socket_stop(void);
  57 int  tipc_netlink_start(void);
  58 void tipc_netlink_stop(void);
  59
  60 #define MOD_NAME "tipc_start: "
  61
  62 #ifndef CONFIG_TIPC_ZONES
  63 #define CONFIG_TIPC_ZONES 3
  64 #endif
  65
  66 #ifndef CONFIG_TIPC_CLUSTERS
  67 #define CONFIG_TIPC_CLUSTERS 1
  68 #endif
  69
  70 #ifndef CONFIG_TIPC_NODES
  71 #define CONFIG_TIPC_NODES 255
  72 #endif
  73
  74 #ifndef CONFIG_TIPC_SLAVE_NODES
  75 #define CONFIG_TIPC_SLAVE_NODES 0
  76 #endif
  77
  78 #ifndef CONFIG_TIPC_PORTS
  79 #define CONFIG_TIPC_PORTS 8191
  80 #endif
  81
  82 #ifndef CONFIG_TIPC_LOG
  83 #define CONFIG_TIPC_LOG 0
  84 #endif
  85
  86 /* global variables used by multiple sub-systems within TIPC */
  87
  88 int tipc_mode = TIPC_NOT_RUNNING;
  89 int tipc_random;
  90 atomic_t tipc_user_count = ATOMIC_INIT(0);
  91
  92 const char tipc_alphabet[] =
  93         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_";
  94
  95 /* configurable TIPC parameters */
  96
  97 u32 tipc_own_addr;
  98 int tipc_max_zones;
  99 int tipc_max_clusters;
 100 int tipc_max_nodes;
 101 int tipc_max_slaves;
 102 int tipc_max_ports;
 103 int tipc_max_subscriptions;
 104 int tipc_max_publications;
 105 int tipc_net_id;
 106 int tipc_remote_management;
 107
 108
 109 int tipc_get_mode(void)
 110 {
 111         return tipc_mode;
 112 }
 113
 114 /**
 115  * tipc_core_stop_net - shut down TIPC networking sub-systems
 116  */
 117
 118 void tipc_core_stop_net(void)
 119 {
 120         tipc_eth_media_stop();
 121         tipc_net_stop();
 122 }
 123
 124 /**
 125  * start_net - start TIPC networking sub-systems
 126  */
 127
 128 int tipc_core_start_net(void)
 129 {
 130         int res;
 131
 132         if ((res = tipc_net_start()) ||
 133             (res = tipc_eth_media_start())) {
 134                 tipc_core_stop_net();
 135         }
 136         return res;
 137 }
 138
 139 /**
 140  * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
 141  */
 142
 143 void tipc_core_stop(void)
 144 {
 145         if (tipc_mode != TIPC_NODE_MODE)
 146                 return;
 147
 148         tipc_mode = TIPC_NOT_RUNNING;
 149
 150         tipc_netlink_stop();
 151         tipc_handler_stop();
 152         tipc_cfg_stop();
 153         tipc_subscr_stop();
 154         tipc_reg_stop();
 155         tipc_nametbl_stop();
 156         tipc_ref_table_stop();
 157         tipc_socket_stop();
 158 }
 159
 160 /**
 161  * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
 162  */
 163
 164 int tipc_core_start(void)
 165 {
 166         int res;
 167
 168         if (tipc_mode != TIPC_NOT_RUNNING)
 169                 return -ENOPROTOOPT;
 170
 171         get_random_bytes(&tipc_random, sizeof(tipc_random));
 172         tipc_mode = TIPC_NODE_MODE;
 173
 174         if ((res = tipc_handler_start()) ||
 175             (res = tipc_ref_table_init(tipc_max_ports + tipc_max_subscriptions,
 176                                        tipc_random)) ||
 177             (res = tipc_reg_start()) ||
 178             (res = tipc_nametbl_init()) ||
 179             (res = tipc_k_signal((Handler)tipc_subscr_start, 0)) ||
 180             (res = tipc_k_signal((Handler)tipc_cfg_init, 0)) ||
 181             (res = tipc_netlink_start()) ||
 182             (res = tipc_socket_init())) {
 183                 tipc_core_stop();
 184         }
 185         return res;
 186 }
 187
 188
 189 static int __init tipc_init(void)
 190 {
 191         int res;
 192
 193         tipc_log_reinit(CONFIG_TIPC_LOG);
 194         info("Activated (compiled " __DATE__ " " __TIME__ ")\n");
 195
 196         tipc_own_addr = 0;
 197         tipc_remote_management = 1;
 198         tipc_max_publications = 10000;
 199         tipc_max_subscriptions = 2000;
 200         tipc_max_ports = delimit(CONFIG_TIPC_PORTS, 127, 65536);
 201         tipc_max_zones = delimit(CONFIG_TIPC_ZONES, 1, 511);
 202         tipc_max_clusters = delimit(CONFIG_TIPC_CLUSTERS, 1, 1);
 203         tipc_max_nodes = delimit(CONFIG_TIPC_NODES, 8, 2047);
 204         tipc_max_slaves = delimit(CONFIG_TIPC_SLAVE_NODES, 0, 2047);
 205         tipc_net_id = 4711;
 206
 207         if ((res = tipc_core_start()))
 208                 err("Unable to start in single node mode\n");
 209         else
 210                 info("Started in single node mode\n");
 211         return res;
 212 }
 213
 214 static void __exit tipc_exit(void)
 215 {
 216         tipc_core_stop_net();
 217         tipc_core_stop();
 218         info("Deactivated\n");
 219         tipc_log_stop();
 220 }
 221
 222 module_init(tipc_init);
 223 module_exit(tipc_exit);
 224
 225 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 226 MODULE_LICENSE("Dual BSD/GPL");
 227
 228 /* Native TIPC API for kernel-space applications (see tipc.h) */
 229
 230 EXPORT_SYMBOL(tipc_attach);
 231 EXPORT_SYMBOL(tipc_detach);
 232 EXPORT_SYMBOL(tipc_get_addr);
 233 EXPORT_SYMBOL(tipc_get_mode);
 234 EXPORT_SYMBOL(tipc_createport);
 235 EXPORT_SYMBOL(tipc_deleteport);
 236 EXPORT_SYMBOL(tipc_ownidentity);
 237 EXPORT_SYMBOL(tipc_portimportance);
 238 EXPORT_SYMBOL(tipc_set_portimportance);
 239 EXPORT_SYMBOL(tipc_portunreliable);
 240 EXPORT_SYMBOL(tipc_set_portunreliable);
 241 EXPORT_SYMBOL(tipc_portunreturnable);
 242 EXPORT_SYMBOL(tipc_set_portunreturnable);
 243 EXPORT_SYMBOL(tipc_publish);
 244 EXPORT_SYMBOL(tipc_withdraw);
 245 EXPORT_SYMBOL(tipc_connect2port);
 246 EXPORT_SYMBOL(tipc_disconnect);
 247 EXPORT_SYMBOL(tipc_shutdown);
 248 EXPORT_SYMBOL(tipc_isconnected);
 249 EXPORT_SYMBOL(tipc_peer);
 250 EXPORT_SYMBOL(tipc_ref_valid);
 251 EXPORT_SYMBOL(tipc_send);
 252 EXPORT_SYMBOL(tipc_send_buf);
 253 EXPORT_SYMBOL(tipc_send2name);
 254 EXPORT_SYMBOL(tipc_forward2name);
 255 EXPORT_SYMBOL(tipc_send_buf2name);
 256 EXPORT_SYMBOL(tipc_forward_buf2name);
 257 EXPORT_SYMBOL(tipc_send2port);
 258 EXPORT_SYMBOL(tipc_forward2port);
 259 EXPORT_SYMBOL(tipc_send_buf2port);
 260 EXPORT_SYMBOL(tipc_forward_buf2port);
 261 EXPORT_SYMBOL(tipc_multicast);
 262 /* EXPORT_SYMBOL(tipc_multicast_buf); not available yet */
 263 EXPORT_SYMBOL(tipc_ispublished);
 264 EXPORT_SYMBOL(tipc_available_nodes);
 265
 266 /* TIPC API for external bearers (see tipc_bearer.h) */
 267
 268 EXPORT_SYMBOL(tipc_block_bearer);
 269 EXPORT_SYMBOL(tipc_continue);
 270 EXPORT_SYMBOL(tipc_disable_bearer);
 271 EXPORT_SYMBOL(tipc_enable_bearer);
 272 EXPORT_SYMBOL(tipc_recv_msg);
 273 EXPORT_SYMBOL(tipc_register_media);
 274
 275 /* TIPC API for external APIs (see tipc_port.h) */
 276
 277 EXPORT_SYMBOL(tipc_createport_raw);
 278 EXPORT_SYMBOL(tipc_set_msg_option);
 279 EXPORT_SYMBOL(tipc_reject_msg);
 280 EXPORT_SYMBOL(tipc_send_buf_fast);
 281 EXPORT_SYMBOL(tipc_acknowledge);
 282 EXPORT_SYMBOL(tipc_get_port);
 283 EXPORT_SYMBOL(tipc_get_handle);
 284