1 /* 2 * net/tipc/core.c: TIPC module code 3 * 4 * Copyright (c) 2003-2006, Ericsson AB 5 * Copyright (c) 2005-2006, 2010-2011, 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/module.h> 38 39 #include "core.h" 40 #include "ref.h" 41 #include "name_table.h" 42 #include "subscr.h" 43 #include "config.h" 44 45 46 #ifndef CONFIG_TIPC_PORTS 47 #define CONFIG_TIPC_PORTS 8191 48 #endif 49 50 #ifndef CONFIG_TIPC_LOG 51 #define CONFIG_TIPC_LOG 0 52 #endif 53 54 /* global variables used by multiple sub-systems within TIPC */ 55 56 int tipc_mode = TIPC_NOT_RUNNING; 57 int tipc_random; 58 59 const char tipc_alphabet[] = 60 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_."; 61 62 /* configurable TIPC parameters */ 63 64 u32 tipc_own_addr; 65 int tipc_max_ports; 66 int tipc_max_subscriptions; 67 int tipc_max_publications; 68 int tipc_net_id; 69 int tipc_remote_management; 70 71 72 /** 73 * tipc_buf_acquire - creates a TIPC message buffer 74 * @size: message size (including TIPC header) 75 * 76 * Returns a new buffer with data pointers set to the specified size. 77 * 78 * NOTE: Headroom is reserved to allow prepending of a data link header. 79 * There may also be unrequested tailroom present at the buffer's end. 80 */ 81 82 struct sk_buff *tipc_buf_acquire(u32 size) 83 { 84 struct sk_buff *skb; 85 unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u; 86 87 skb = alloc_skb_fclone(buf_size, GFP_ATOMIC); 88 if (skb) { 89 skb_reserve(skb, BUF_HEADROOM); 90 skb_put(skb, size); 91 skb->next = NULL; 92 } 93 return skb; 94 } 95 96 /** 97 * tipc_core_stop_net - shut down TIPC networking sub-systems 98 */ 99 100 static void tipc_core_stop_net(void) 101 { 102 tipc_eth_media_stop(); 103 tipc_net_stop(); 104 } 105 106 /** 107 * start_net - start TIPC networking sub-systems 108 */ 109 110 int tipc_core_start_net(unsigned long addr) 111 { 112 int res; 113 114 res = tipc_net_start(addr); 115 if (!res) 116 res = tipc_eth_media_start(); 117 if (res) 118 tipc_core_stop_net(); 119 return res; 120 } 121 122 /** 123 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode 124 */ 125 126 static void tipc_core_stop(void) 127 { 128 if (tipc_mode != TIPC_NODE_MODE) 129 return; 130 131 tipc_mode = TIPC_NOT_RUNNING; 132 133 tipc_netlink_stop(); 134 tipc_handler_stop(); 135 tipc_cfg_stop(); 136 tipc_subscr_stop(); 137 tipc_nametbl_stop(); 138 tipc_ref_table_stop(); 139 tipc_socket_stop(); 140 tipc_log_resize(0); 141 } 142 143 /** 144 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode 145 */ 146 147 static int tipc_core_start(void) 148 { 149 int res; 150 151 if (tipc_mode != TIPC_NOT_RUNNING) 152 return -ENOPROTOOPT; 153 154 get_random_bytes(&tipc_random, sizeof(tipc_random)); 155 tipc_mode = TIPC_NODE_MODE; 156 157 res = tipc_handler_start(); 158 if (!res) 159 res = tipc_ref_table_init(tipc_max_ports, tipc_random); 160 if (!res) 161 res = tipc_nametbl_init(); 162 if (!res) 163 res = tipc_k_signal((Handler)tipc_subscr_start, 0); 164 if (!res) 165 res = tipc_k_signal((Handler)tipc_cfg_init, 0); 166 if (!res) 167 res = tipc_netlink_start(); 168 if (!res) 169 res = tipc_socket_init(); 170 if (res) 171 tipc_core_stop(); 172 173 return res; 174 } 175 176 177 static int __init tipc_init(void) 178 { 179 int res; 180 181 if (tipc_log_resize(CONFIG_TIPC_LOG) != 0) 182 warn("Unable to create log buffer\n"); 183 184 info("Activated (version " TIPC_MOD_VER ")\n"); 185 186 tipc_own_addr = 0; 187 tipc_remote_management = 1; 188 tipc_max_publications = 10000; 189 tipc_max_subscriptions = 2000; 190 tipc_max_ports = CONFIG_TIPC_PORTS; 191 tipc_net_id = 4711; 192 193 res = tipc_core_start(); 194 if (res) 195 err("Unable to start in single node mode\n"); 196 else 197 info("Started in single node mode\n"); 198 return res; 199 } 200 201 static void __exit tipc_exit(void) 202 { 203 tipc_core_stop_net(); 204 tipc_core_stop(); 205 info("Deactivated\n"); 206 } 207 208 module_init(tipc_init); 209 module_exit(tipc_exit); 210 211 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication"); 212 MODULE_LICENSE("Dual BSD/GPL"); 213 MODULE_VERSION(TIPC_MOD_VER); 214