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, 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 */
  51 int tipc_random;
  52
  53 const char tipc_alphabet[] =
  54         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
  55
  56 /* configurable TIPC parameters */
  57 u32 tipc_own_addr;
  58 int tipc_max_ports;
  59 int tipc_max_subscriptions;
  60 int tipc_max_publications;
  61 int tipc_net_id;
  62 int 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  */
  74 struct 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  */
  91 static 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  */
 100 int 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  */
 115 static 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  */
 129 static 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
 155 static 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
 176 static void __exit tipc_exit(void)
 177 {
 178         tipc_core_stop_net();
 179         tipc_core_stop();
 180         pr_info("Deactivated\n");
 181 }
 182
 183 module_init(tipc_init);
 184 module_exit(tipc_exit);
 185
 186 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 187 MODULE_LICENSE("Dual BSD/GPL");
 188 MODULE_VERSION(TIPC_MOD_VER);