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 int tipc_get_mode(void)
 100 {
 101         return tipc_mode;
 102 }
 103
 104 /**
 105  * buf_acquire - creates a TIPC message buffer
 106  * @size: message size (including TIPC header)
 107  *
 108  * Returns a new buffer with data pointers set to the specified size.
 109  *
 110  * NOTE: Headroom is reserved to allow prepending of a data link header.
 111  *       There may also be unrequested tailroom present at the buffer's end.
 112  */
 113
 114 struct sk_buff *buf_acquire(u32 size)
 115 {
 116         struct sk_buff *skb;
 117         unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
 118
 119         skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
 120         if (skb) {
 121                 skb_reserve(skb, BUF_HEADROOM);
 122                 skb_put(skb, size);
 123                 skb->next = NULL;
 124         }
 125         return skb;
 126 }
 127
 128 /**
 129  * tipc_core_stop_net - shut down TIPC networking sub-systems
 130  */
 131
 132 void tipc_core_stop_net(void)
 133 {
 134         tipc_eth_media_stop();
 135         tipc_net_stop();
 136 }
 137
 138 /**
 139  * start_net - start TIPC networking sub-systems
 140  */
 141
 142 int tipc_core_start_net(unsigned long addr)
 143 {
 144         int res;
 145
 146         if ((res = tipc_net_start(addr)) ||
 147             (res = tipc_eth_media_start())) {
 148                 tipc_core_stop_net();
 149         }
 150         return res;
 151 }
 152
 153 /**
 154  * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
 155  */
 156
 157 void tipc_core_stop(void)
 158 {
 159         if (tipc_mode != TIPC_NODE_MODE)
 160                 return;
 161
 162         tipc_mode = TIPC_NOT_RUNNING;
 163
 164         tipc_netlink_stop();
 165         tipc_handler_stop();
 166         tipc_cfg_stop();
 167         tipc_subscr_stop();
 168         tipc_reg_stop();
 169         tipc_nametbl_stop();
 170         tipc_ref_table_stop();
 171         tipc_socket_stop();
 172 }
 173
 174 /**
 175  * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
 176  */
 177
 178 int tipc_core_start(void)
 179 {
 180         int res;
 181
 182         if (tipc_mode != TIPC_NOT_RUNNING)
 183                 return -ENOPROTOOPT;
 184
 185         get_random_bytes(&tipc_random, sizeof(tipc_random));
 186         tipc_mode = TIPC_NODE_MODE;
 187
 188         if ((res = tipc_handler_start()) ||
 189             (res = tipc_ref_table_init(tipc_max_ports, tipc_random)) ||
 190             (res = tipc_reg_start()) ||
 191             (res = tipc_nametbl_init()) ||
 192             (res = tipc_k_signal((Handler)tipc_subscr_start, 0)) ||
 193             (res = tipc_k_signal((Handler)tipc_cfg_init, 0)) ||
 194             (res = tipc_netlink_start()) ||
 195             (res = tipc_socket_init())) {
 196                 tipc_core_stop();
 197         }
 198         return res;
 199 }
 200
 201
 202 static int __init tipc_init(void)
 203 {
 204         int res;
 205
 206         tipc_log_resize(CONFIG_TIPC_LOG);
 207         info("Activated (version " TIPC_MOD_VER
 208              " compiled " __DATE__ " " __TIME__ ")\n");
 209
 210         tipc_own_addr = 0;
 211         tipc_remote_management = 1;
 212         tipc_max_publications = 10000;
 213         tipc_max_subscriptions = 2000;
 214         tipc_max_ports = CONFIG_TIPC_PORTS;
 215         tipc_max_zones = CONFIG_TIPC_ZONES;
 216         tipc_max_clusters = CONFIG_TIPC_CLUSTERS;
 217         tipc_max_nodes = CONFIG_TIPC_NODES;
 218         tipc_max_slaves = CONFIG_TIPC_SLAVE_NODES;
 219         tipc_net_id = 4711;
 220
 221         if ((res = tipc_core_start()))
 222                 err("Unable to start in single node mode\n");
 223         else
 224                 info("Started in single node mode\n");
 225         return res;
 226 }
 227
 228 static void __exit tipc_exit(void)
 229 {
 230         tipc_core_stop_net();
 231         tipc_core_stop();
 232         info("Deactivated\n");
 233         tipc_log_resize(0);
 234 }
 235
 236 module_init(tipc_init);
 237 module_exit(tipc_exit);
 238
 239 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 240 MODULE_LICENSE("Dual BSD/GPL");
 241 MODULE_VERSION(TIPC_MOD_VER);
 242
 243 /* Native TIPC API for kernel-space applications (see tipc.h) */
 244
 245 EXPORT_SYMBOL(tipc_attach);
 246 EXPORT_SYMBOL(tipc_detach);
 247 EXPORT_SYMBOL(tipc_get_addr);
 248 EXPORT_SYMBOL(tipc_get_mode);
 249 EXPORT_SYMBOL(tipc_createport);
 250 EXPORT_SYMBOL(tipc_deleteport);
 251 EXPORT_SYMBOL(tipc_ownidentity);
 252 EXPORT_SYMBOL(tipc_portimportance);
 253 EXPORT_SYMBOL(tipc_set_portimportance);
 254 EXPORT_SYMBOL(tipc_portunreliable);
 255 EXPORT_SYMBOL(tipc_set_portunreliable);
 256 EXPORT_SYMBOL(tipc_portunreturnable);
 257 EXPORT_SYMBOL(tipc_set_portunreturnable);
 258 EXPORT_SYMBOL(tipc_publish);
 259 EXPORT_SYMBOL(tipc_withdraw);
 260 EXPORT_SYMBOL(tipc_connect2port);
 261 EXPORT_SYMBOL(tipc_disconnect);
 262 EXPORT_SYMBOL(tipc_shutdown);
 263 EXPORT_SYMBOL(tipc_isconnected);
 264 EXPORT_SYMBOL(tipc_peer);
 265 EXPORT_SYMBOL(tipc_ref_valid);
 266 EXPORT_SYMBOL(tipc_send);
 267 EXPORT_SYMBOL(tipc_send_buf);
 268 EXPORT_SYMBOL(tipc_send2name);
 269 EXPORT_SYMBOL(tipc_forward2name);
 270 EXPORT_SYMBOL(tipc_send_buf2name);
 271 EXPORT_SYMBOL(tipc_forward_buf2name);
 272 EXPORT_SYMBOL(tipc_send2port);
 273 EXPORT_SYMBOL(tipc_forward2port);
 274 EXPORT_SYMBOL(tipc_send_buf2port);
 275 EXPORT_SYMBOL(tipc_forward_buf2port);
 276 EXPORT_SYMBOL(tipc_multicast);
 277 /* EXPORT_SYMBOL(tipc_multicast_buf); not available yet */
 278 EXPORT_SYMBOL(tipc_ispublished);
 279 EXPORT_SYMBOL(tipc_available_nodes);
 280
 281 /* TIPC API for external bearers (see tipc_bearer.h) */
 282
 283 EXPORT_SYMBOL(tipc_block_bearer);
 284 EXPORT_SYMBOL(tipc_continue);
 285 EXPORT_SYMBOL(tipc_disable_bearer);
 286 EXPORT_SYMBOL(tipc_enable_bearer);
 287 EXPORT_SYMBOL(tipc_recv_msg);
 288 EXPORT_SYMBOL(tipc_register_media);
 289
 290 /* TIPC API for external APIs (see tipc_port.h) */
 291
 292 EXPORT_SYMBOL(tipc_createport_raw);
 293 EXPORT_SYMBOL(tipc_reject_msg);
 294 EXPORT_SYMBOL(tipc_send_buf_fast);
 295 EXPORT_SYMBOL(tipc_acknowledge);
 296 EXPORT_SYMBOL(tipc_get_port);
 297 EXPORT_SYMBOL(tipc_get_handle);
 298