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