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); 278 279