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