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