net/tipc/core.c

   1 /*
   2  * net/tipc/core.c: TIPC module code
   3  *
   4  * Copyright (c) 2003-2006, Ericsson AB
   5  * Copyright (c) 2005-2006, 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
  52 #define TIPC_MOD_VER "1.6.4"
  53
  54 #ifndef CONFIG_TIPC_ZONES
  55 #define CONFIG_TIPC_ZONES 3
  56 #endif
  57
  58 #ifndef CONFIG_TIPC_CLUSTERS
  59 #define CONFIG_TIPC_CLUSTERS 1
  60 #endif
  61
  62 #ifndef CONFIG_TIPC_NODES
  63 #define CONFIG_TIPC_NODES 255
  64 #endif
  65
  66 #ifndef CONFIG_TIPC_SLAVE_NODES
  67 #define CONFIG_TIPC_SLAVE_NODES 0
  68 #endif
  69
  70 #ifndef CONFIG_TIPC_PORTS
  71 #define CONFIG_TIPC_PORTS 8191
  72 #endif
  73
  74 #ifndef CONFIG_TIPC_LOG
  75 #define CONFIG_TIPC_LOG 0
  76 #endif
  77
  78 /* global variables used by multiple sub-systems within TIPC */
  79
  80 int tipc_mode = TIPC_NOT_RUNNING;
  81 int tipc_random;
  82 atomic_t tipc_user_count = ATOMIC_INIT(0);
  83
  84 const char tipc_alphabet[] =
  85         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
  86
  87 /* configurable TIPC parameters */
  88
  89 u32 tipc_own_addr;
  90 int tipc_max_zones;
  91 int tipc_max_clusters;
  92 int tipc_max_nodes;
  93 int tipc_max_slaves;
  94 int tipc_max_ports;
  95 int tipc_max_subscriptions;
  96 int tipc_max_publications;
  97 int tipc_net_id;
  98 int tipc_remote_management;
  99
 100
 101 int tipc_get_mode(void)
 102 {
 103         return tipc_mode;
 104 }
 105
 106 /**
 107  * tipc_core_stop_net - shut down TIPC networking sub-systems
 108  */
 109
 110 void tipc_core_stop_net(void)
 111 {
 112         tipc_eth_media_stop();
 113         tipc_net_stop();
 114 }
 115
 116 /**
 117  * start_net - start TIPC networking sub-systems
 118  */
 119
 120 int tipc_core_start_net(unsigned long addr)
 121 {
 122         int res;
 123
 124         if ((res = tipc_net_start(addr)) ||
 125             (res = tipc_eth_media_start())) {
 126                 tipc_core_stop_net();
 127         }
 128         return res;
 129 }
 130
 131 /**
 132  * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
 133  */
 134
 135 void tipc_core_stop(void)
 136 {
 137         if (tipc_mode != TIPC_NODE_MODE)
 138                 return;
 139
 140         tipc_mode = TIPC_NOT_RUNNING;
 141
 142         tipc_netlink_stop();
 143         tipc_handler_stop();
 144         tipc_cfg_stop();
 145         tipc_subscr_stop();
 146         tipc_reg_stop();
 147         tipc_nametbl_stop();
 148         tipc_ref_table_stop();
 149         tipc_socket_stop();
 150 }
 151
 152 /**
 153  * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
 154  */
 155
 156 int tipc_core_start(void)
 157 {
 158         int res;
 159
 160         if (tipc_mode != TIPC_NOT_RUNNING)
 161                 return -ENOPROTOOPT;
 162
 163         get_random_bytes(&tipc_random, sizeof(tipc_random));
 164         tipc_mode = TIPC_NODE_MODE;
 165
 166         if ((res = tipc_handler_start()) ||
 167             (res = tipc_ref_table_init(tipc_max_ports, tipc_random)) ||
 168             (res = tipc_reg_start()) ||
 169             (res = tipc_nametbl_init()) ||
 170             (res = tipc_k_signal((Handler)tipc_subscr_start, 0)) ||
 171             (res = tipc_k_signal((Handler)tipc_cfg_init, 0)) ||
 172             (res = tipc_netlink_start()) ||
 173             (res = tipc_socket_init())) {
 174                 tipc_core_stop();
 175         }
 176         return res;
 177 }
 178
 179
 180 static int __init tipc_init(void)
 181 {
 182         int res;
 183
 184         tipc_log_resize(CONFIG_TIPC_LOG);
 185         info("Activated (version " TIPC_MOD_VER
 186              " compiled " __DATE__ " " __TIME__ ")\n");
 187
 188         tipc_own_addr = 0;
 189         tipc_remote_management = 1;
 190         tipc_max_publications = 10000;
 191         tipc_max_subscriptions = 2000;
 192         tipc_max_ports = delimit(CONFIG_TIPC_PORTS, 127, 65536);
 193         tipc_max_zones = delimit(CONFIG_TIPC_ZONES, 1, 255);
 194         tipc_max_clusters = delimit(CONFIG_TIPC_CLUSTERS, 1, 1);
 195         tipc_max_nodes = delimit(CONFIG_TIPC_NODES, 8, 2047);
 196         tipc_max_slaves = delimit(CONFIG_TIPC_SLAVE_NODES, 0, 2047);
 197         tipc_net_id = 4711;
 198
 199         if ((res = tipc_core_start()))
 200                 err("Unable to start in single node mode\n");
 201         else
 202                 info("Started in single node mode\n");
 203         return res;
 204 }
 205
 206 static void __exit tipc_exit(void)
 207 {
 208         tipc_core_stop_net();
 209         tipc_core_stop();
 210         info("Deactivated\n");
 211         tipc_log_resize(0);
 212 }
 213
 214 module_init(tipc_init);
 215 module_exit(tipc_exit);
 216
 217 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 218 MODULE_LICENSE("Dual BSD/GPL");
 219 MODULE_VERSION(TIPC_MOD_VER);
 220
 221 /* Native TIPC API for kernel-space applications (see tipc.h) */
 222
 223 EXPORT_SYMBOL(tipc_attach);
 224 EXPORT_SYMBOL(tipc_detach);
 225 EXPORT_SYMBOL(tipc_get_addr);
 226 EXPORT_SYMBOL(tipc_get_mode);
 227 EXPORT_SYMBOL(tipc_createport);
 228 EXPORT_SYMBOL(tipc_deleteport);
 229 EXPORT_SYMBOL(tipc_ownidentity);
 230 EXPORT_SYMBOL(tipc_portimportance);
 231 EXPORT_SYMBOL(tipc_set_portimportance);
 232 EXPORT_SYMBOL(tipc_portunreliable);
 233 EXPORT_SYMBOL(tipc_set_portunreliable);
 234 EXPORT_SYMBOL(tipc_portunreturnable);
 235 EXPORT_SYMBOL(tipc_set_portunreturnable);
 236 EXPORT_SYMBOL(tipc_publish);
 237 EXPORT_SYMBOL(tipc_withdraw);
 238 EXPORT_SYMBOL(tipc_connect2port);
 239 EXPORT_SYMBOL(tipc_disconnect);
 240 EXPORT_SYMBOL(tipc_shutdown);
 241 EXPORT_SYMBOL(tipc_isconnected);
 242 EXPORT_SYMBOL(tipc_peer);
 243 EXPORT_SYMBOL(tipc_ref_valid);
 244 EXPORT_SYMBOL(tipc_send);
 245 EXPORT_SYMBOL(tipc_send_buf);
 246 EXPORT_SYMBOL(tipc_send2name);
 247 EXPORT_SYMBOL(tipc_forward2name);
 248 EXPORT_SYMBOL(tipc_send_buf2name);
 249 EXPORT_SYMBOL(tipc_forward_buf2name);
 250 EXPORT_SYMBOL(tipc_send2port);
 251 EXPORT_SYMBOL(tipc_forward2port);
 252 EXPORT_SYMBOL(tipc_send_buf2port);
 253 EXPORT_SYMBOL(tipc_forward_buf2port);
 254 EXPORT_SYMBOL(tipc_multicast);
 255 /* EXPORT_SYMBOL(tipc_multicast_buf); not available yet */
 256 EXPORT_SYMBOL(tipc_ispublished);
 257 EXPORT_SYMBOL(tipc_available_nodes);
 258
 259 /* TIPC API for external bearers (see tipc_bearer.h) */
 260
 261 EXPORT_SYMBOL(tipc_block_bearer);
 262 EXPORT_SYMBOL(tipc_continue);
 263 EXPORT_SYMBOL(tipc_disable_bearer);
 264 EXPORT_SYMBOL(tipc_enable_bearer);
 265 EXPORT_SYMBOL(tipc_recv_msg);
 266 EXPORT_SYMBOL(tipc_register_media);
 267
 268 /* TIPC API for external APIs (see tipc_port.h) */
 269
 270 EXPORT_SYMBOL(tipc_createport_raw);
 271 EXPORT_SYMBOL(tipc_reject_msg);
 272 EXPORT_SYMBOL(tipc_send_buf_fast);
 273 EXPORT_SYMBOL(tipc_acknowledge);
 274 EXPORT_SYMBOL(tipc_get_port);
 275 EXPORT_SYMBOL(tipc_get_handle);
 276