1 /* 2 * net/tipc/core.c: TIPC module code 3 * 4 * Copyright (c) 2003-2006, 2013, 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 sysctl_tipc_rmem[3] __read_mostly; /* min/default/max */ 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 - switch TIPC from SINGLE NODE to NOT RUNNING mode 80 */ 81 static void tipc_core_stop(void) 82 { 83 tipc_handler_stop(); 84 tipc_net_stop(); 85 tipc_bearer_cleanup(); 86 tipc_netlink_stop(); 87 tipc_subscr_stop(); 88 tipc_nametbl_stop(); 89 tipc_ref_table_stop(); 90 tipc_socket_stop(); 91 tipc_unregister_sysctl(); 92 } 93 94 /** 95 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode 96 */ 97 static int tipc_core_start(void) 98 { 99 int err; 100 101 get_random_bytes(&tipc_random, sizeof(tipc_random)); 102 103 err = tipc_handler_start(); 104 if (err) 105 goto out_handler; 106 107 err = tipc_ref_table_init(tipc_max_ports, tipc_random); 108 if (err) 109 goto out_reftbl; 110 111 err = tipc_nametbl_init(); 112 if (err) 113 goto out_nametbl; 114 115 err = tipc_netlink_start(); 116 if (err) 117 goto out_netlink; 118 119 err = tipc_socket_init(); 120 if (err) 121 goto out_socket; 122 123 err = tipc_register_sysctl(); 124 if (err) 125 goto out_sysctl; 126 127 err = tipc_subscr_start(); 128 if (err) 129 goto out_subscr; 130 131 err = tipc_bearer_setup(); 132 if (err) 133 goto out_bearer; 134 135 return 0; 136 out_bearer: 137 tipc_subscr_stop(); 138 out_subscr: 139 tipc_unregister_sysctl(); 140 out_sysctl: 141 tipc_socket_stop(); 142 out_socket: 143 tipc_netlink_stop(); 144 out_netlink: 145 tipc_nametbl_stop(); 146 out_nametbl: 147 tipc_ref_table_stop(); 148 out_reftbl: 149 tipc_handler_stop(); 150 out_handler: 151 return err; 152 } 153 154 static int __init tipc_init(void) 155 { 156 int res; 157 158 pr_info("Activated (version " TIPC_MOD_VER ")\n"); 159 160 tipc_own_addr = 0; 161 tipc_max_ports = CONFIG_TIPC_PORTS; 162 tipc_net_id = 4711; 163 164 sysctl_tipc_rmem[0] = CONN_OVERLOAD_LIMIT >> 4 << TIPC_LOW_IMPORTANCE; 165 sysctl_tipc_rmem[1] = CONN_OVERLOAD_LIMIT >> 4 << 166 TIPC_CRITICAL_IMPORTANCE; 167 sysctl_tipc_rmem[2] = CONN_OVERLOAD_LIMIT; 168 169 res = tipc_core_start(); 170 if (res) 171 pr_err("Unable to start in single node mode\n"); 172 else 173 pr_info("Started in single node mode\n"); 174 return res; 175 } 176 177 static void __exit tipc_exit(void) 178 { 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