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