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