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 <linux/init.h>
  38 #include <linux/module.h>
  39 #include <linux/kernel.h>
  40 #include <linux/random.h>
  41
  42 #include "core.h"
  43 #include "dbg.h"
  44 #include "ref.h"
  45 #include "net.h"
  46 #include "user_reg.h"
  47 #include "name_table.h"
  48 #include "subscr.h"
  49 #include "config.h"
  50
  51
  52 #ifndef CONFIG_TIPC_ZONES
  53 #define CONFIG_TIPC_ZONES 3
  54 #endif
  55
  56 #ifndef CONFIG_TIPC_CLUSTERS
  57 #define CONFIG_TIPC_CLUSTERS 1
  58 #endif
  59
  60 #ifndef CONFIG_TIPC_NODES
  61 #define CONFIG_TIPC_NODES 255
  62 #endif
  63
  64 #ifndef CONFIG_TIPC_SLAVE_NODES
  65 #define CONFIG_TIPC_SLAVE_NODES 0
  66 #endif
  67
  68 #ifndef CONFIG_TIPC_PORTS
  69 #define CONFIG_TIPC_PORTS 8191
  70 #endif
  71
  72 #ifndef CONFIG_TIPC_LOG
  73 #define CONFIG_TIPC_LOG 0
  74 #endif
  75
  76 /* global variables used by multiple sub-systems within TIPC */
  77
  78 int tipc_mode = TIPC_NOT_RUNNING;
  79 int tipc_random;
  80 atomic_t tipc_user_count = ATOMIC_INIT(0);
  81
  82 const char tipc_alphabet[] =
  83         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
  84
  85 /* configurable TIPC parameters */
  86
  87 u32 tipc_own_addr;
  88 int tipc_max_zones;
  89 int tipc_max_clusters;
  90 int tipc_max_nodes;
  91 int tipc_max_slaves;
  92 int tipc_max_ports;
  93 int tipc_max_subscriptions;
  94 int tipc_max_publications;
  95 int tipc_net_id;
  96 int tipc_remote_management;
  97
  98
  99 /**
 100  * tipc_buf_acquire - creates a TIPC message buffer
 101  * @size: message size (including TIPC header)
 102  *
 103  * Returns a new buffer with data pointers set to the specified size.
 104  *
 105  * NOTE: Headroom is reserved to allow prepending of a data link header.
 106  *       There may also be unrequested tailroom present at the buffer's end.
 107  */
 108
 109 struct sk_buff *tipc_buf_acquire(u32 size)
 110 {
 111         struct sk_buff *skb;
 112         unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
 113
 114         skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
 115         if (skb) {
 116                 skb_reserve(skb, BUF_HEADROOM);
 117                 skb_put(skb, size);
 118                 skb->next = NULL;
 119         }
 120         return skb;
 121 }
 122
 123 /**
 124  * tipc_core_stop_net - shut down TIPC networking sub-systems
 125  */
 126
 127 static void tipc_core_stop_net(void)
 128 {
 129         tipc_eth_media_stop();
 130         tipc_net_stop();
 131 }
 132
 133 /**
 134  * start_net - start TIPC networking sub-systems
 135  */
 136
 137 int tipc_core_start_net(unsigned long addr)
 138 {
 139         int res;
 140
 141         if ((res = tipc_net_start(addr)) ||
 142             (res = tipc_eth_media_start())) {
 143                 tipc_core_stop_net();
 144         }
 145         return res;
 146 }
 147
 148 /**
 149  * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
 150  */
 151
 152 static void tipc_core_stop(void)
 153 {
 154         if (tipc_mode != TIPC_NODE_MODE)
 155                 return;
 156
 157         tipc_mode = TIPC_NOT_RUNNING;
 158
 159         tipc_netlink_stop();
 160         tipc_handler_stop();
 161         tipc_cfg_stop();
 162         tipc_subscr_stop();
 163         tipc_reg_stop();
 164         tipc_nametbl_stop();
 165         tipc_ref_table_stop();
 166         tipc_socket_stop();
 167         tipc_log_resize(0);
 168 }
 169
 170 /**
 171  * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
 172  */
 173
 174 static int tipc_core_start(void)
 175 {
 176         int res;
 177
 178         if (tipc_mode != TIPC_NOT_RUNNING)
 179                 return -ENOPROTOOPT;
 180
 181         get_random_bytes(&tipc_random, sizeof(tipc_random));
 182         tipc_mode = TIPC_NODE_MODE;
 183
 184         if ((res = tipc_handler_start()) ||
 185             (res = tipc_ref_table_init(tipc_max_ports, tipc_random)) ||
 186             (res = tipc_reg_start()) ||
 187             (res = tipc_nametbl_init()) ||
 188             (res = tipc_k_signal((Handler)tipc_subscr_start, 0)) ||
 189             (res = tipc_k_signal((Handler)tipc_cfg_init, 0)) ||
 190             (res = tipc_netlink_start()) ||
 191             (res = tipc_socket_init())) {
 192                 tipc_core_stop();
 193         }
 194         return res;
 195 }
 196
 197
 198 static int __init tipc_init(void)
 199 {
 200         int res;
 201
 202         if (tipc_log_resize(CONFIG_TIPC_LOG) != 0)
 203                 warn("Unable to create log buffer\n");
 204
 205         info("Activated (version " TIPC_MOD_VER
 206              " compiled " __DATE__ " " __TIME__ ")\n");
 207
 208         tipc_own_addr = 0;
 209         tipc_remote_management = 1;
 210         tipc_max_publications = 10000;
 211         tipc_max_subscriptions = 2000;
 212         tipc_max_ports = CONFIG_TIPC_PORTS;
 213         tipc_max_zones = CONFIG_TIPC_ZONES;
 214         tipc_max_clusters = CONFIG_TIPC_CLUSTERS;
 215         tipc_max_nodes = CONFIG_TIPC_NODES;
 216         tipc_max_slaves = CONFIG_TIPC_SLAVE_NODES;
 217         tipc_net_id = 4711;
 218
 219         if ((res = tipc_core_start()))
 220                 err("Unable to start in single node mode\n");
 221         else
 222                 info("Started in single node mode\n");
 223         return res;
 224 }
 225
 226 static void __exit tipc_exit(void)
 227 {
 228         tipc_core_stop_net();
 229         tipc_core_stop();
 230         info("Deactivated\n");
 231 }
 232
 233 module_init(tipc_init);
 234 module_exit(tipc_exit);
 235
 236 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 237 MODULE_LICENSE("Dual BSD/GPL");
 238 MODULE_VERSION(TIPC_MOD_VER);
 239
 240 /* Native TIPC API for kernel-space applications (see tipc.h) */
 241
 242 EXPORT_SYMBOL(tipc_attach);
 243 EXPORT_SYMBOL(tipc_detach);
 244 EXPORT_SYMBOL(tipc_createport);
 245 EXPORT_SYMBOL(tipc_deleteport);
 246 EXPORT_SYMBOL(tipc_ownidentity);
 247 EXPORT_SYMBOL(tipc_portimportance);
 248 EXPORT_SYMBOL(tipc_set_portimportance);
 249 EXPORT_SYMBOL(tipc_portunreliable);
 250 EXPORT_SYMBOL(tipc_set_portunreliable);
 251 EXPORT_SYMBOL(tipc_portunreturnable);
 252 EXPORT_SYMBOL(tipc_set_portunreturnable);
 253 EXPORT_SYMBOL(tipc_publish);
 254 EXPORT_SYMBOL(tipc_withdraw);
 255 EXPORT_SYMBOL(tipc_connect2port);
 256 EXPORT_SYMBOL(tipc_disconnect);
 257 EXPORT_SYMBOL(tipc_shutdown);
 258 EXPORT_SYMBOL(tipc_send);
 259 EXPORT_SYMBOL(tipc_send2name);
 260 EXPORT_SYMBOL(tipc_send2port);
 261 EXPORT_SYMBOL(tipc_multicast);
 262
 263 /* TIPC API for external bearers (see tipc_bearer.h) */
 264
 265 EXPORT_SYMBOL(tipc_block_bearer);
 266 EXPORT_SYMBOL(tipc_continue);
 267 EXPORT_SYMBOL(tipc_disable_bearer);
 268 EXPORT_SYMBOL(tipc_enable_bearer);
 269 EXPORT_SYMBOL(tipc_recv_msg);
 270 EXPORT_SYMBOL(tipc_register_media);
 271
 272 /* TIPC API for external APIs (see tipc_port.h) */
 273
 274 EXPORT_SYMBOL(tipc_createport_raw);
 275 EXPORT_SYMBOL(tipc_reject_msg);
 276 EXPORT_SYMBOL(tipc_send_buf_fast);
 277 EXPORT_SYMBOL(tipc_acknowledge);
 278