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, 2010-2011, 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/module.h>
  38
  39#include "core.h"
  40#include "ref.h"
  41#include "name_table.h"
  42#include "subscr.h"
  43#include "config.h"
  44
  45
  46#ifndef CONFIG_TIPC_PORTS
  47#define CONFIG_TIPC_PORTS 8191
  48#endif
  49
  50#ifndef CONFIG_TIPC_LOG
  51#define CONFIG_TIPC_LOG 0
  52#endif
  53
  54/* global variables used by multiple sub-systems within TIPC */
  55
  56int tipc_mode = TIPC_NOT_RUNNING;
  57int tipc_random;
  58
  59const char tipc_alphabet[] =
  60        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
  61
  62/* configurable TIPC parameters */
  63
  64u32 tipc_own_addr;
  65int tipc_max_ports;
  66int tipc_max_subscriptions;
  67int tipc_max_publications;
  68int tipc_net_id;
  69int tipc_remote_management;
  70
  71
  72/**
  73 * tipc_buf_acquire - creates a TIPC message buffer
  74 * @size: message size (including TIPC header)
  75 *
  76 * Returns a new buffer with data pointers set to the specified size.
  77 *
  78 * NOTE: Headroom is reserved to allow prepending of a data link header.
  79 *       There may also be unrequested tailroom present at the buffer's end.
  80 */
  81
  82struct sk_buff *tipc_buf_acquire(u32 size)
  83{
  84        struct sk_buff *skb;
  85        unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
  86
  87        skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
  88        if (skb) {
  89                skb_reserve(skb, BUF_HEADROOM);
  90                skb_put(skb, size);
  91                skb->next = NULL;
  92        }
  93        return skb;
  94}
  95
  96/**
  97 * tipc_core_stop_net - shut down TIPC networking sub-systems
  98 */
  99
 100static void tipc_core_stop_net(void)
 101{
 102        tipc_net_stop();
 103        tipc_eth_media_stop();
 104}
 105
 106/**
 107 * start_net - start TIPC networking sub-systems
 108 */
 109
 110int tipc_core_start_net(unsigned long addr)
 111{
 112        int res;
 113
 114        res = tipc_net_start(addr);
 115        if (!res)
 116                res = tipc_eth_media_start();
 117        if (res)
 118                tipc_core_stop_net();
 119        return res;
 120}
 121
 122/**
 123 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
 124 */
 125
 126static void tipc_core_stop(void)
 127{
 128        if (tipc_mode != TIPC_NODE_MODE)
 129                return;
 130
 131        tipc_mode = TIPC_NOT_RUNNING;
 132
 133        tipc_netlink_stop();
 134        tipc_handler_stop();
 135        tipc_cfg_stop();
 136        tipc_subscr_stop();
 137        tipc_nametbl_stop();
 138        tipc_ref_table_stop();
 139        tipc_socket_stop();
 140        tipc_log_resize(0);
 141}
 142
 143/**
 144 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
 145 */
 146
 147static int tipc_core_start(void)
 148{
 149        int res;
 150
 151        if (tipc_mode != TIPC_NOT_RUNNING)
 152                return -ENOPROTOOPT;
 153
 154        get_random_bytes(&tipc_random, sizeof(tipc_random));
 155        tipc_mode = TIPC_NODE_MODE;
 156
 157        res = tipc_handler_start();
 158        if (!res)
 159                res = tipc_ref_table_init(tipc_max_ports, tipc_random);
 160        if (!res)
 161                res = tipc_nametbl_init();
 162        if (!res)
 163                res = tipc_k_signal((Handler)tipc_subscr_start, 0);
 164        if (!res)
 165                res = tipc_k_signal((Handler)tipc_cfg_init, 0);
 166        if (!res)
 167                res = tipc_netlink_start();
 168        if (!res)
 169                res = tipc_socket_init();
 170        if (res)
 171                tipc_core_stop();
 172
 173        return res;
 174}
 175
 176
 177static int __init tipc_init(void)
 178{
 179        int res;
 180
 181        if (tipc_log_resize(CONFIG_TIPC_LOG) != 0)
 182                warn("Unable to create log buffer\n");
 183
 184        info("Activated (version " TIPC_MOD_VER ")\n");
 185
 186        tipc_own_addr = 0;
 187        tipc_remote_management = 1;
 188        tipc_max_publications = 10000;
 189        tipc_max_subscriptions = 2000;
 190        tipc_max_ports = CONFIG_TIPC_PORTS;
 191        tipc_net_id = 4711;
 192
 193        res = tipc_core_start();
 194        if (res)
 195                err("Unable to start in single node mode\n");
 196        else
 197                info("Started in single node mode\n");
 198        return res;
 199}
 200
 201static void __exit tipc_exit(void)
 202{
 203        tipc_core_stop_net();
 204        tipc_core_stop();
 205        info("Deactivated\n");
 206}
 207
 208module_init(tipc_init);
 209module_exit(tipc_exit);
 210
 211MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 212MODULE_LICENSE("Dual BSD/GPL");
 213MODULE_VERSION(TIPC_MOD_VER);
 214