1 /* 2 * net/tipc/core.c: TIPC module code 3 * 4 * Copyright (c) 2003-2006, Ericsson AB 5 * Copyright (c) 2005-2006, 2010-2013, 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 #include "port.h" 43 44 #include <linux/module.h> 45 46 /* global variables used by multiple sub-systems within TIPC */ 47 int tipc_random __read_mostly; 48 49 /* configurable TIPC parameters */ 50 u32 tipc_own_addr __read_mostly; 51 int tipc_max_ports __read_mostly; 52 int tipc_net_id __read_mostly; 53 int tipc_remote_management __read_mostly; 54 int sysctl_tipc_rmem[3] __read_mostly; /* min/default/max */ 55 56 /** 57 * tipc_buf_acquire - creates a TIPC message buffer 58 * @size: message size (including TIPC header) 59 * 60 * Returns a new buffer with data pointers set to the specified size. 61 * 62 * NOTE: Headroom is reserved to allow prepending of a data link header. 63 * There may also be unrequested tailroom present at the buffer's end. 64 */ 65 struct sk_buff *tipc_buf_acquire(u32 size) 66 { 67 struct sk_buff *skb; 68 unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u; 69 70 skb = alloc_skb_fclone(buf_size, GFP_ATOMIC); 71 if (skb) { 72 skb_reserve(skb, BUF_HEADROOM); 73 skb_put(skb, size); 74 skb->next = NULL; 75 } 76 return skb; 77 } 78 79 /** 80 * tipc_core_stop_net - shut down TIPC networking sub-systems 81 */ 82 static void tipc_core_stop_net(void) 83 { 84 tipc_net_stop(); 85 tipc_eth_media_stop(); 86 tipc_ib_media_stop(); 87 } 88 89 /** 90 * start_net - start TIPC networking sub-systems 91 */ 92 int tipc_core_start_net(unsigned long addr) 93 { 94 int res; 95 96 tipc_net_start(addr); 97 res = tipc_eth_media_start(); 98 if (res < 0) 99 goto err; 100 res = tipc_ib_media_start(); 101 if (res < 0) 102 goto err; 103 return res; 104 105 err: 106 tipc_core_stop_net(); 107 return res; 108 } 109 110 /** 111 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode 112 */ 113 static void tipc_core_stop(void) 114 { 115 tipc_netlink_stop(); 116 tipc_cfg_stop(); 117 tipc_subscr_stop(); 118 tipc_nametbl_stop(); 119 tipc_ref_table_stop(); 120 tipc_socket_stop(); 121 tipc_unregister_sysctl(); 122 } 123 124 /** 125 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode 126 */ 127 static int tipc_core_start(void) 128 { 129 int res; 130 131 get_random_bytes(&tipc_random, sizeof(tipc_random)); 132 133 res = tipc_handler_start(); 134 if (!res) 135 res = tipc_ref_table_init(tipc_max_ports, tipc_random); 136 if (!res) 137 res = tipc_nametbl_init(); 138 if (!res) 139 res = tipc_netlink_start(); 140 if (!res) 141 res = tipc_socket_init(); 142 if (!res) 143 res = tipc_register_sysctl(); 144 if (!res) 145 res = tipc_subscr_start(); 146 if (!res) 147 res = tipc_cfg_init(); 148 if (res) { 149 tipc_handler_stop(); 150 tipc_core_stop(); 151 } 152 return res; 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_ports = CONFIG_TIPC_PORTS; 164 tipc_net_id = 4711; 165 166 sysctl_tipc_rmem[0] = CONN_OVERLOAD_LIMIT >> 4 << TIPC_LOW_IMPORTANCE; 167 sysctl_tipc_rmem[1] = CONN_OVERLOAD_LIMIT >> 4 << 168 TIPC_CRITICAL_IMPORTANCE; 169 sysctl_tipc_rmem[2] = CONN_OVERLOAD_LIMIT; 170 171 res = tipc_core_start(); 172 if (res) 173 pr_err("Unable to start in single node mode\n"); 174 else 175 pr_info("Started in single node mode\n"); 176 return res; 177 } 178 179 static void __exit tipc_exit(void) 180 { 181 tipc_handler_stop(); 182 tipc_core_stop_net(); 183 tipc_core_stop(); 184 pr_info("Deactivated\n"); 185 } 186 187 module_init(tipc_init); 188 module_exit(tipc_exit); 189 190 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication"); 191 MODULE_LICENSE("Dual BSD/GPL"); 192 MODULE_VERSION(TIPC_MOD_VER); 193