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 "ref.h" 44 #include "net.h" 45 #include "user_reg.h" 46 #include "name_table.h" 47 #include "subscr.h" 48 #include "config.h" 49 50 51 #ifndef CONFIG_TIPC_CLUSTERS 52 #define CONFIG_TIPC_CLUSTERS 1 53 #endif 54 55 #ifndef CONFIG_TIPC_NODES 56 #define CONFIG_TIPC_NODES 255 57 #endif 58 59 #ifndef CONFIG_TIPC_PORTS 60 #define CONFIG_TIPC_PORTS 8191 61 #endif 62 63 #ifndef CONFIG_TIPC_LOG 64 #define CONFIG_TIPC_LOG 0 65 #endif 66 67 /* global variables used by multiple sub-systems within TIPC */ 68 69 int tipc_mode = TIPC_NOT_RUNNING; 70 int tipc_random; 71 atomic_t tipc_user_count = ATOMIC_INIT(0); 72 73 const char tipc_alphabet[] = 74 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_."; 75 76 /* configurable TIPC parameters */ 77 78 u32 tipc_own_addr; 79 int tipc_max_clusters; 80 int tipc_max_nodes; 81 int tipc_max_ports; 82 int tipc_max_subscriptions; 83 int tipc_max_publications; 84 int tipc_net_id; 85 int tipc_remote_management; 86 87 88 /** 89 * tipc_buf_acquire - creates a TIPC message buffer 90 * @size: message size (including TIPC header) 91 * 92 * Returns a new buffer with data pointers set to the specified size. 93 * 94 * NOTE: Headroom is reserved to allow prepending of a data link header. 95 * There may also be unrequested tailroom present at the buffer's end. 96 */ 97 98 struct sk_buff *tipc_buf_acquire(u32 size) 99 { 100 struct sk_buff *skb; 101 unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u; 102 103 skb = alloc_skb_fclone(buf_size, GFP_ATOMIC); 104 if (skb) { 105 skb_reserve(skb, BUF_HEADROOM); 106 skb_put(skb, size); 107 skb->next = NULL; 108 } 109 return skb; 110 } 111 112 /** 113 * tipc_core_stop_net - shut down TIPC networking sub-systems 114 */ 115 116 static void tipc_core_stop_net(void) 117 { 118 tipc_eth_media_stop(); 119 tipc_net_stop(); 120 } 121 122 /** 123 * start_net - start TIPC networking sub-systems 124 */ 125 126 int tipc_core_start_net(unsigned long addr) 127 { 128 int res; 129 130 if ((res = tipc_net_start(addr)) || 131 (res = tipc_eth_media_start())) { 132 tipc_core_stop_net(); 133 } 134 return res; 135 } 136 137 /** 138 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode 139 */ 140 141 static void tipc_core_stop(void) 142 { 143 if (tipc_mode != TIPC_NODE_MODE) 144 return; 145 146 tipc_mode = TIPC_NOT_RUNNING; 147 148 tipc_netlink_stop(); 149 tipc_handler_stop(); 150 tipc_cfg_stop(); 151 tipc_subscr_stop(); 152 tipc_reg_stop(); 153 tipc_nametbl_stop(); 154 tipc_ref_table_stop(); 155 tipc_socket_stop(); 156 tipc_log_resize(0); 157 } 158 159 /** 160 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode 161 */ 162 163 static int tipc_core_start(void) 164 { 165 int res; 166 167 if (tipc_mode != TIPC_NOT_RUNNING) 168 return -ENOPROTOOPT; 169 170 get_random_bytes(&tipc_random, sizeof(tipc_random)); 171 tipc_mode = TIPC_NODE_MODE; 172 173 if ((res = tipc_handler_start()) || 174 (res = tipc_ref_table_init(tipc_max_ports, tipc_random)) || 175 (res = tipc_reg_start()) || 176 (res = tipc_nametbl_init()) || 177 (res = tipc_k_signal((Handler)tipc_subscr_start, 0)) || 178 (res = tipc_k_signal((Handler)tipc_cfg_init, 0)) || 179 (res = tipc_netlink_start()) || 180 (res = tipc_socket_init())) { 181 tipc_core_stop(); 182 } 183 return res; 184 } 185 186 187 static int __init tipc_init(void) 188 { 189 int res; 190 191 if (tipc_log_resize(CONFIG_TIPC_LOG) != 0) 192 warn("Unable to create log buffer\n"); 193 194 info("Activated (version " TIPC_MOD_VER 195 " compiled " __DATE__ " " __TIME__ ")\n"); 196 197 tipc_own_addr = 0; 198 tipc_remote_management = 1; 199 tipc_max_publications = 10000; 200 tipc_max_subscriptions = 2000; 201 tipc_max_ports = CONFIG_TIPC_PORTS; 202 tipc_max_clusters = CONFIG_TIPC_CLUSTERS; 203 tipc_max_nodes = CONFIG_TIPC_NODES; 204 tipc_net_id = 4711; 205 206 if ((res = tipc_core_start())) 207 err("Unable to start in single node mode\n"); 208 else 209 info("Started in single node mode\n"); 210 return res; 211 } 212 213 static void __exit tipc_exit(void) 214 { 215 tipc_core_stop_net(); 216 tipc_core_stop(); 217 info("Deactivated\n"); 218 } 219 220 module_init(tipc_init); 221 module_exit(tipc_exit); 222 223 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication"); 224 MODULE_LICENSE("Dual BSD/GPL"); 225 MODULE_VERSION(TIPC_MOD_VER); 226