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