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