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, 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
  44 #ifndef CONFIG_TIPC_NODES
  45 #define CONFIG_TIPC_NODES 255
  46 #endif
  47
  48 #ifndef CONFIG_TIPC_PORTS
  49 #define CONFIG_TIPC_PORTS 8191
  50 #endif
  51
  52 #ifndef CONFIG_TIPC_LOG
  53 #define CONFIG_TIPC_LOG 0
  54 #endif
  55
  56 /* global variables used by multiple sub-systems within TIPC */
  57
  58 int tipc_mode = TIPC_NOT_RUNNING;
  59 int tipc_random;
  60 atomic_t tipc_user_count = ATOMIC_INIT(0);
  61
  62 const char tipc_alphabet[] =
  63         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
  64
  65 /* configurable TIPC parameters */
  66
  67 u32 tipc_own_addr;
  68 int tipc_max_nodes;
  69 int tipc_max_ports;
  70 int tipc_max_subscriptions;
  71 int tipc_max_publications;
  72 int tipc_net_id;
  73 int tipc_remote_management;
  74
  75
  76 /**
  77  * tipc_buf_acquire - creates a TIPC message buffer
  78  * @size: message size (including TIPC header)
  79  *
  80  * Returns a new buffer with data pointers set to the specified size.
  81  *
  82  * NOTE: Headroom is reserved to allow prepending of a data link header.
  83  *       There may also be unrequested tailroom present at the buffer's end.
  84  */
  85
  86 struct sk_buff *tipc_buf_acquire(u32 size)
  87 {
  88         struct sk_buff *skb;
  89         unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
  90
  91         skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
  92         if (skb) {
  93                 skb_reserve(skb, BUF_HEADROOM);
  94                 skb_put(skb, size);
  95                 skb->next = NULL;
  96         }
  97         return skb;
  98 }
  99
 100 /**
 101  * tipc_core_stop_net - shut down TIPC networking sub-systems
 102  */
 103
 104 static void tipc_core_stop_net(void)
 105 {
 106         tipc_eth_media_stop();
 107         tipc_net_stop();
 108 }
 109
 110 /**
 111  * start_net - start TIPC networking sub-systems
 112  */
 113
 114 int tipc_core_start_net(unsigned long addr)
 115 {
 116         int res;
 117
 118         res = tipc_net_start(addr);
 119         if (!res)
 120                 res = tipc_eth_media_start();
 121         if (res)
 122                 tipc_core_stop_net();
 123         return res;
 124 }
 125
 126 /**
 127  * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
 128  */
 129
 130 static void tipc_core_stop(void)
 131 {
 132         if (tipc_mode != TIPC_NODE_MODE)
 133                 return;
 134
 135         tipc_mode = TIPC_NOT_RUNNING;
 136
 137         tipc_netlink_stop();
 138         tipc_handler_stop();
 139         tipc_cfg_stop();
 140         tipc_subscr_stop();
 141         tipc_nametbl_stop();
 142         tipc_ref_table_stop();
 143         tipc_socket_stop();
 144         tipc_log_resize(0);
 145 }
 146
 147 /**
 148  * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
 149  */
 150
 151 static int tipc_core_start(void)
 152 {
 153         int res;
 154
 155         if (tipc_mode != TIPC_NOT_RUNNING)
 156                 return -ENOPROTOOPT;
 157
 158         get_random_bytes(&tipc_random, sizeof(tipc_random));
 159         tipc_mode = TIPC_NODE_MODE;
 160
 161         res = tipc_handler_start();
 162         if (!res)
 163                 res = tipc_ref_table_init(tipc_max_ports, tipc_random);
 164         if (!res)
 165                 res = tipc_nametbl_init();
 166         if (!res)
 167                 res = tipc_k_signal((Handler)tipc_subscr_start, 0);
 168         if (!res)
 169                 res = tipc_k_signal((Handler)tipc_cfg_init, 0);
 170         if (!res)
 171                 res = tipc_netlink_start();
 172         if (!res)
 173                 res = tipc_socket_init();
 174         if (res)
 175                 tipc_core_stop();
 176
 177         return res;
 178 }
 179
 180
 181 static int __init tipc_init(void)
 182 {
 183         int res;
 184
 185         if (tipc_log_resize(CONFIG_TIPC_LOG) != 0)
 186                 warn("Unable to create log buffer\n");
 187
 188         info("Activated (version " TIPC_MOD_VER
 189              " compiled " __DATE__ " " __TIME__ ")\n");
 190
 191         tipc_own_addr = 0;
 192         tipc_remote_management = 1;
 193         tipc_max_publications = 10000;
 194         tipc_max_subscriptions = 2000;
 195         tipc_max_ports = CONFIG_TIPC_PORTS;
 196         tipc_max_nodes = CONFIG_TIPC_NODES;
 197         tipc_net_id = 4711;
 198
 199         res = tipc_core_start();
 200         if (res)
 201                 err("Unable to start in single node mode\n");
 202         else
 203                 info("Started in single node mode\n");
 204         return res;
 205 }
 206
 207 static void __exit tipc_exit(void)
 208 {
 209         tipc_core_stop_net();
 210         tipc_core_stop();
 211         info("Deactivated\n");
 212 }
 213
 214 module_init(tipc_init);
 215 module_exit(tipc_exit);
 216
 217 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 218 MODULE_LICENSE("Dual BSD/GPL");
 219 MODULE_VERSION(TIPC_MOD_VER);