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