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