linux/net/tipc/core.c
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   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#ifndef CONFIG_TIPC_ZONES
  53#define CONFIG_TIPC_ZONES 3
  54#endif
  55
  56#ifndef CONFIG_TIPC_CLUSTERS
  57#define CONFIG_TIPC_CLUSTERS 1
  58#endif
  59
  60#ifndef CONFIG_TIPC_NODES
  61#define CONFIG_TIPC_NODES 255
  62#endif
  63
  64#ifndef CONFIG_TIPC_SLAVE_NODES
  65#define CONFIG_TIPC_SLAVE_NODES 0
  66#endif
  67
  68#ifndef CONFIG_TIPC_PORTS
  69#define CONFIG_TIPC_PORTS 8191
  70#endif
  71
  72#ifndef CONFIG_TIPC_LOG
  73#define CONFIG_TIPC_LOG 0
  74#endif
  75
  76/* global variables used by multiple sub-systems within TIPC */
  77
  78int tipc_mode = TIPC_NOT_RUNNING;
  79int tipc_random;
  80atomic_t tipc_user_count = ATOMIC_INIT(0);
  81
  82const char tipc_alphabet[] =
  83        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
  84
  85/* configurable TIPC parameters */
  86
  87u32 tipc_own_addr;
  88int tipc_max_zones;
  89int tipc_max_clusters;
  90int tipc_max_nodes;
  91int tipc_max_slaves;
  92int tipc_max_ports;
  93int tipc_max_subscriptions;
  94int tipc_max_publications;
  95int tipc_net_id;
  96int tipc_remote_management;
  97
  98
  99int tipc_get_mode(void)
 100{
 101        return tipc_mode;
 102}
 103
 104/**
 105 * buf_acquire - creates a TIPC message buffer
 106 * @size: message size (including TIPC header)
 107 *
 108 * Returns a new buffer with data pointers set to the specified size.
 109 *
 110 * NOTE: Headroom is reserved to allow prepending of a data link header.
 111 *       There may also be unrequested tailroom present at the buffer's end.
 112 */
 113
 114struct sk_buff *buf_acquire(u32 size)
 115{
 116        struct sk_buff *skb;
 117        unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
 118
 119        skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
 120        if (skb) {
 121                skb_reserve(skb, BUF_HEADROOM);
 122                skb_put(skb, size);
 123                skb->next = NULL;
 124        }
 125        return skb;
 126}
 127
 128/**
 129 * tipc_core_stop_net - shut down TIPC networking sub-systems
 130 */
 131
 132void tipc_core_stop_net(void)
 133{
 134        tipc_eth_media_stop();
 135        tipc_net_stop();
 136}
 137
 138/**
 139 * start_net - start TIPC networking sub-systems
 140 */
 141
 142int tipc_core_start_net(unsigned long addr)
 143{
 144        int res;
 145
 146        if ((res = tipc_net_start(addr)) ||
 147            (res = tipc_eth_media_start())) {
 148                tipc_core_stop_net();
 149        }
 150        return res;
 151}
 152
 153/**
 154 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
 155 */
 156
 157void tipc_core_stop(void)
 158{
 159        if (tipc_mode != TIPC_NODE_MODE)
 160                return;
 161
 162        tipc_mode = TIPC_NOT_RUNNING;
 163
 164        tipc_netlink_stop();
 165        tipc_handler_stop();
 166        tipc_cfg_stop();
 167        tipc_subscr_stop();
 168        tipc_reg_stop();
 169        tipc_nametbl_stop();
 170        tipc_ref_table_stop();
 171        tipc_socket_stop();
 172}
 173
 174/**
 175 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
 176 */
 177
 178int tipc_core_start(void)
 179{
 180        int res;
 181
 182        if (tipc_mode != TIPC_NOT_RUNNING)
 183                return -ENOPROTOOPT;
 184
 185        get_random_bytes(&tipc_random, sizeof(tipc_random));
 186        tipc_mode = TIPC_NODE_MODE;
 187
 188        if ((res = tipc_handler_start()) ||
 189            (res = tipc_ref_table_init(tipc_max_ports, tipc_random)) ||
 190            (res = tipc_reg_start()) ||
 191            (res = tipc_nametbl_init()) ||
 192            (res = tipc_k_signal((Handler)tipc_subscr_start, 0)) ||
 193            (res = tipc_k_signal((Handler)tipc_cfg_init, 0)) ||
 194            (res = tipc_netlink_start()) ||
 195            (res = tipc_socket_init())) {
 196                tipc_core_stop();
 197        }
 198        return res;
 199}
 200
 201
 202static int __init tipc_init(void)
 203{
 204        int res;
 205
 206        tipc_log_resize(CONFIG_TIPC_LOG);
 207        info("Activated (version " TIPC_MOD_VER
 208             " compiled " __DATE__ " " __TIME__ ")\n");
 209
 210        tipc_own_addr = 0;
 211        tipc_remote_management = 1;
 212        tipc_max_publications = 10000;
 213        tipc_max_subscriptions = 2000;
 214        tipc_max_ports = CONFIG_TIPC_PORTS;
 215        tipc_max_zones = CONFIG_TIPC_ZONES;
 216        tipc_max_clusters = CONFIG_TIPC_CLUSTERS;
 217        tipc_max_nodes = CONFIG_TIPC_NODES;
 218        tipc_max_slaves = CONFIG_TIPC_SLAVE_NODES;
 219        tipc_net_id = 4711;
 220
 221        if ((res = tipc_core_start()))
 222                err("Unable to start in single node mode\n");
 223        else
 224                info("Started in single node mode\n");
 225        return res;
 226}
 227
 228static void __exit tipc_exit(void)
 229{
 230        tipc_core_stop_net();
 231        tipc_core_stop();
 232        info("Deactivated\n");
 233        tipc_log_resize(0);
 234}
 235
 236module_init(tipc_init);
 237module_exit(tipc_exit);
 238
 239MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 240MODULE_LICENSE("Dual BSD/GPL");
 241MODULE_VERSION(TIPC_MOD_VER);
 242
 243/* Native TIPC API for kernel-space applications (see tipc.h) */
 244
 245EXPORT_SYMBOL(tipc_attach);
 246EXPORT_SYMBOL(tipc_detach);
 247EXPORT_SYMBOL(tipc_get_addr);
 248EXPORT_SYMBOL(tipc_get_mode);
 249EXPORT_SYMBOL(tipc_createport);
 250EXPORT_SYMBOL(tipc_deleteport);
 251EXPORT_SYMBOL(tipc_ownidentity);
 252EXPORT_SYMBOL(tipc_portimportance);
 253EXPORT_SYMBOL(tipc_set_portimportance);
 254EXPORT_SYMBOL(tipc_portunreliable);
 255EXPORT_SYMBOL(tipc_set_portunreliable);
 256EXPORT_SYMBOL(tipc_portunreturnable);
 257EXPORT_SYMBOL(tipc_set_portunreturnable);
 258EXPORT_SYMBOL(tipc_publish);
 259EXPORT_SYMBOL(tipc_withdraw);
 260EXPORT_SYMBOL(tipc_connect2port);
 261EXPORT_SYMBOL(tipc_disconnect);
 262EXPORT_SYMBOL(tipc_shutdown);
 263EXPORT_SYMBOL(tipc_isconnected);
 264EXPORT_SYMBOL(tipc_peer);
 265EXPORT_SYMBOL(tipc_ref_valid);
 266EXPORT_SYMBOL(tipc_send);
 267EXPORT_SYMBOL(tipc_send_buf);
 268EXPORT_SYMBOL(tipc_send2name);
 269EXPORT_SYMBOL(tipc_forward2name);
 270EXPORT_SYMBOL(tipc_send_buf2name);
 271EXPORT_SYMBOL(tipc_forward_buf2name);
 272EXPORT_SYMBOL(tipc_send2port);
 273EXPORT_SYMBOL(tipc_forward2port);
 274EXPORT_SYMBOL(tipc_send_buf2port);
 275EXPORT_SYMBOL(tipc_forward_buf2port);
 276EXPORT_SYMBOL(tipc_multicast);
 277/* EXPORT_SYMBOL(tipc_multicast_buf); not available yet */
 278EXPORT_SYMBOL(tipc_ispublished);
 279EXPORT_SYMBOL(tipc_available_nodes);
 280
 281/* TIPC API for external bearers (see tipc_bearer.h) */
 282
 283EXPORT_SYMBOL(tipc_block_bearer);
 284EXPORT_SYMBOL(tipc_continue);
 285EXPORT_SYMBOL(tipc_disable_bearer);
 286EXPORT_SYMBOL(tipc_enable_bearer);
 287EXPORT_SYMBOL(tipc_recv_msg);
 288EXPORT_SYMBOL(tipc_register_media);
 289
 290/* TIPC API for external APIs (see tipc_port.h) */
 291
 292EXPORT_SYMBOL(tipc_createport_raw);
 293EXPORT_SYMBOL(tipc_reject_msg);
 294EXPORT_SYMBOL(tipc_send_buf_fast);
 295EXPORT_SYMBOL(tipc_acknowledge);
 296EXPORT_SYMBOL(tipc_get_port);
 297EXPORT_SYMBOL(tipc_get_handle);
 298
 299