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