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 - switch TIPC from SINGLE NODE to NOT RUNNING mode 81 */ 82 static void tipc_core_stop(void) 83 { 84 tipc_handler_stop(); 85 tipc_net_stop(); 86 tipc_bearer_cleanup(); 87 tipc_netlink_stop(); 88 tipc_cfg_stop(); 89 tipc_subscr_stop(); 90 tipc_nametbl_stop(); 91 tipc_ref_table_stop(); 92 tipc_socket_stop(); 93 tipc_unregister_sysctl(); 94 } 95 96 /** 97 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode 98 */ 99 static int tipc_core_start(void) 100 { 101 int err; 102 103 get_random_bytes(&tipc_random, sizeof(tipc_random)); 104 105 err = tipc_handler_start(); 106 if (err) 107 goto out_handler; 108 109 err = tipc_ref_table_init(tipc_max_ports, tipc_random); 110 if (err) 111 goto out_reftbl; 112 113 err = tipc_nametbl_init(); 114 if (err) 115 goto out_nametbl; 116 117 err = tipc_netlink_start(); 118 if (err) 119 goto out_netlink; 120 121 err = tipc_socket_init(); 122 if (err) 123 goto out_socket; 124 125 err = tipc_register_sysctl(); 126 if (err) 127 goto out_sysctl; 128 129 err = tipc_subscr_start(); 130 if (err) 131 goto out_subscr; 132 133 err = tipc_cfg_init(); 134 if (err) 135 goto out_cfg; 136 137 err = tipc_bearer_setup(); 138 if (err) 139 goto out_bearer; 140 141 return 0; 142 out_bearer: 143 tipc_cfg_stop(); 144 out_cfg: 145 tipc_subscr_stop(); 146 out_subscr: 147 tipc_unregister_sysctl(); 148 out_sysctl: 149 tipc_socket_stop(); 150 out_socket: 151 tipc_netlink_stop(); 152 out_netlink: 153 tipc_nametbl_stop(); 154 out_nametbl: 155 tipc_ref_table_stop(); 156 out_reftbl: 157 tipc_handler_stop(); 158 out_handler: 159 return err; 160 } 161 162 static int __init tipc_init(void) 163 { 164 int res; 165 166 pr_info("Activated (version " TIPC_MOD_VER ")\n"); 167 168 tipc_own_addr = 0; 169 tipc_remote_management = 1; 170 tipc_max_ports = CONFIG_TIPC_PORTS; 171 tipc_net_id = 4711; 172 173 sysctl_tipc_rmem[0] = CONN_OVERLOAD_LIMIT >> 4 << TIPC_LOW_IMPORTANCE; 174 sysctl_tipc_rmem[1] = CONN_OVERLOAD_LIMIT >> 4 << 175 TIPC_CRITICAL_IMPORTANCE; 176 sysctl_tipc_rmem[2] = CONN_OVERLOAD_LIMIT; 177 178 res = tipc_core_start(); 179 if (res) 180 pr_err("Unable to start in single node mode\n"); 181 else 182 pr_info("Started in single node mode\n"); 183 return res; 184 } 185 186 static void __exit tipc_exit(void) 187 { 188 tipc_core_stop(); 189 pr_info("Deactivated\n"); 190 } 191 192 module_init(tipc_init); 193 module_exit(tipc_exit); 194 195 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication"); 196 MODULE_LICENSE("Dual BSD/GPL"); 197 MODULE_VERSION(TIPC_MOD_VER); 198