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 "core.h" 38 #include "ref.h" 39 #include "name_table.h" 40 #include "subscr.h" 41 #include "config.h" 42 43 44 #ifndef CONFIG_TIPC_NODES 45 #define CONFIG_TIPC_NODES 255 46 #endif 47 48 #ifndef CONFIG_TIPC_PORTS 49 #define CONFIG_TIPC_PORTS 8191 50 #endif 51 52 #ifndef CONFIG_TIPC_LOG 53 #define CONFIG_TIPC_LOG 0 54 #endif 55 56 /* global variables used by multiple sub-systems within TIPC */ 57 58 int tipc_mode = TIPC_NOT_RUNNING; 59 int tipc_random; 60 atomic_t tipc_user_count = ATOMIC_INIT(0); 61 62 const char tipc_alphabet[] = 63 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_."; 64 65 /* configurable TIPC parameters */ 66 67 u32 tipc_own_addr; 68 int tipc_max_nodes; 69 int tipc_max_ports; 70 int tipc_max_subscriptions; 71 int tipc_max_publications; 72 int tipc_net_id; 73 int tipc_remote_management; 74 75 76 /** 77 * tipc_buf_acquire - creates a TIPC message buffer 78 * @size: message size (including TIPC header) 79 * 80 * Returns a new buffer with data pointers set to the specified size. 81 * 82 * NOTE: Headroom is reserved to allow prepending of a data link header. 83 * There may also be unrequested tailroom present at the buffer's end. 84 */ 85 86 struct sk_buff *tipc_buf_acquire(u32 size) 87 { 88 struct sk_buff *skb; 89 unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u; 90 91 skb = alloc_skb_fclone(buf_size, GFP_ATOMIC); 92 if (skb) { 93 skb_reserve(skb, BUF_HEADROOM); 94 skb_put(skb, size); 95 skb->next = NULL; 96 } 97 return skb; 98 } 99 100 /** 101 * tipc_core_stop_net - shut down TIPC networking sub-systems 102 */ 103 104 static void tipc_core_stop_net(void) 105 { 106 tipc_eth_media_stop(); 107 tipc_net_stop(); 108 } 109 110 /** 111 * start_net - start TIPC networking sub-systems 112 */ 113 114 int tipc_core_start_net(unsigned long addr) 115 { 116 int res; 117 118 res = tipc_net_start(addr); 119 if (!res) 120 res = tipc_eth_media_start(); 121 if (res) 122 tipc_core_stop_net(); 123 return res; 124 } 125 126 /** 127 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode 128 */ 129 130 static void tipc_core_stop(void) 131 { 132 if (tipc_mode != TIPC_NODE_MODE) 133 return; 134 135 tipc_mode = TIPC_NOT_RUNNING; 136 137 tipc_netlink_stop(); 138 tipc_handler_stop(); 139 tipc_cfg_stop(); 140 tipc_subscr_stop(); 141 tipc_nametbl_stop(); 142 tipc_ref_table_stop(); 143 tipc_socket_stop(); 144 tipc_log_resize(0); 145 } 146 147 /** 148 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode 149 */ 150 151 static int tipc_core_start(void) 152 { 153 int res; 154 155 if (tipc_mode != TIPC_NOT_RUNNING) 156 return -ENOPROTOOPT; 157 158 get_random_bytes(&tipc_random, sizeof(tipc_random)); 159 tipc_mode = TIPC_NODE_MODE; 160 161 res = tipc_handler_start(); 162 if (!res) 163 res = tipc_ref_table_init(tipc_max_ports, tipc_random); 164 if (!res) 165 res = tipc_nametbl_init(); 166 if (!res) 167 res = tipc_k_signal((Handler)tipc_subscr_start, 0); 168 if (!res) 169 res = tipc_k_signal((Handler)tipc_cfg_init, 0); 170 if (!res) 171 res = tipc_netlink_start(); 172 if (!res) 173 res = tipc_socket_init(); 174 if (res) 175 tipc_core_stop(); 176 177 return res; 178 } 179 180 181 static int __init tipc_init(void) 182 { 183 int res; 184 185 if (tipc_log_resize(CONFIG_TIPC_LOG) != 0) 186 warn("Unable to create log buffer\n"); 187 188 info("Activated (version " TIPC_MOD_VER 189 " compiled " __DATE__ " " __TIME__ ")\n"); 190 191 tipc_own_addr = 0; 192 tipc_remote_management = 1; 193 tipc_max_publications = 10000; 194 tipc_max_subscriptions = 2000; 195 tipc_max_ports = CONFIG_TIPC_PORTS; 196 tipc_max_nodes = CONFIG_TIPC_NODES; 197 tipc_net_id = 4711; 198 199 res = tipc_core_start(); 200 if (res) 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