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 <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
  56 int tipc_mode = TIPC_NOT_RUNNING;
  57 int tipc_random;
  58
  59 const char tipc_alphabet[] =
  60         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
  61
  62 /* configurable TIPC parameters */
  63
  64 u32 tipc_own_addr;
  65 int tipc_max_ports;
  66 int tipc_max_subscriptions;
  67 int tipc_max_publications;
  68 int tipc_net_id;
  69 int 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
  82 struct 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
 100 static 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
 110 int 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
 126 static 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
 147 static 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
 177 static 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
 201 static void __exit tipc_exit(void)
 202 {
 203         tipc_core_stop_net();
 204         tipc_core_stop();
 205         info("Deactivated\n");
 206 }
 207
 208 module_init(tipc_init);
 209 module_exit(tipc_exit);
 210
 211 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 212 MODULE_LICENSE("Dual BSD/GPL");
 213 MODULE_VERSION(TIPC_MOD_VER);