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