LXR linux/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
  80int tipc_mode = TIPC_NOT_RUNNING;
  81int tipc_random;
  82atomic_t tipc_user_count = ATOMIC_INIT(0);
  83
  84const char tipc_alphabet[] =
  85        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
  86
  87/* configurable TIPC parameters */
  88
  89u32 tipc_own_addr;
  90int tipc_max_zones;
  91int tipc_max_clusters;
  92int tipc_max_nodes;
  93int tipc_max_slaves;
  94int tipc_max_ports;
  95int tipc_max_subscriptions;
  96int tipc_max_publications;
  97int tipc_net_id;
  98int tipc_remote_management;
  99
 100
 101int 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
 110void 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
 120int 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
 135void 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
 156int 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
 180static 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
 206static 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
 214module_init(tipc_init);
 215module_exit(tipc_exit);
 216
 217MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 218MODULE_LICENSE("Dual BSD/GPL");
 219MODULE_VERSION(TIPC_MOD_VER);
 220
 221/* Native TIPC API for kernel-space applications (see tipc.h) */
 222
 223EXPORT_SYMBOL(tipc_attach);
 224EXPORT_SYMBOL(tipc_detach);
 225EXPORT_SYMBOL(tipc_get_addr);
 226EXPORT_SYMBOL(tipc_get_mode);
 227EXPORT_SYMBOL(tipc_createport);
 228EXPORT_SYMBOL(tipc_deleteport);
 229EXPORT_SYMBOL(tipc_ownidentity);
 230EXPORT_SYMBOL(tipc_portimportance);
 231EXPORT_SYMBOL(tipc_set_portimportance);
 232EXPORT_SYMBOL(tipc_portunreliable);
 233EXPORT_SYMBOL(tipc_set_portunreliable);
 234EXPORT_SYMBOL(tipc_portunreturnable);
 235EXPORT_SYMBOL(tipc_set_portunreturnable);
 236EXPORT_SYMBOL(tipc_publish);
 237EXPORT_SYMBOL(tipc_withdraw);
 238EXPORT_SYMBOL(tipc_connect2port);
 239EXPORT_SYMBOL(tipc_disconnect);
 240EXPORT_SYMBOL(tipc_shutdown);
 241EXPORT_SYMBOL(tipc_isconnected);
 242EXPORT_SYMBOL(tipc_peer);
 243EXPORT_SYMBOL(tipc_ref_valid);
 244EXPORT_SYMBOL(tipc_send);
 245EXPORT_SYMBOL(tipc_send_buf);
 246EXPORT_SYMBOL(tipc_send2name);
 247EXPORT_SYMBOL(tipc_forward2name);
 248EXPORT_SYMBOL(tipc_send_buf2name);
 249EXPORT_SYMBOL(tipc_forward_buf2name);
 250EXPORT_SYMBOL(tipc_send2port);
 251EXPORT_SYMBOL(tipc_forward2port);
 252EXPORT_SYMBOL(tipc_send_buf2port);
 253EXPORT_SYMBOL(tipc_forward_buf2port);
 254EXPORT_SYMBOL(tipc_multicast);
 255/* EXPORT_SYMBOL(tipc_multicast_buf); not available yet */
 256EXPORT_SYMBOL(tipc_ispublished);
 257EXPORT_SYMBOL(tipc_available_nodes);
 258
 259/* TIPC API for external bearers (see tipc_bearer.h) */
 260
 261EXPORT_SYMBOL(tipc_block_bearer);
 262EXPORT_SYMBOL(tipc_continue);
 263EXPORT_SYMBOL(tipc_disable_bearer);
 264EXPORT_SYMBOL(tipc_enable_bearer);
 265EXPORT_SYMBOL(tipc_recv_msg);
 266EXPORT_SYMBOL(tipc_register_media);
 267
 268/* TIPC API for external APIs (see tipc_port.h) */
 269
 270EXPORT_SYMBOL(tipc_createport_raw);
 271EXPORT_SYMBOL(tipc_reject_msg);
 272EXPORT_SYMBOL(tipc_send_buf_fast);
 273EXPORT_SYMBOL(tipc_acknowledge);
 274EXPORT_SYMBOL(tipc_get_port);
 275EXPORT_SYMBOL(tipc_get_handle);
 276
 277