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 "name_table.h" 39 #include "subscr.h" 40 #include "config.h" 41 #include "socket.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 sysctl_tipc_rmem[3] __read_mostly; /* min/default/max */ 53 54 /** 55 * tipc_buf_acquire - creates a TIPC message buffer 56 * @size: message size (including TIPC header) 57 * 58 * Returns a new buffer with data pointers set to the specified size. 59 * 60 * NOTE: Headroom is reserved to allow prepending of a data link header. 61 * There may also be unrequested tailroom present at the buffer's end. 62 */ 63 struct sk_buff *tipc_buf_acquire(u32 size) 64 { 65 struct sk_buff *skb; 66 unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u; 67 68 skb = alloc_skb_fclone(buf_size, GFP_ATOMIC); 69 if (skb) { 70 skb_reserve(skb, BUF_HEADROOM); 71 skb_put(skb, size); 72 skb->next = NULL; 73 } 74 return skb; 75 } 76 77 /** 78 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode 79 */ 80 static void tipc_core_stop(void) 81 { 82 tipc_net_stop(); 83 tipc_bearer_cleanup(); 84 tipc_netlink_stop(); 85 tipc_subscr_stop(); 86 tipc_nametbl_stop(); 87 tipc_sk_ref_table_stop(); 88 tipc_socket_stop(); 89 tipc_unregister_sysctl(); 90 } 91 92 /** 93 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode 94 */ 95 static int tipc_core_start(void) 96 { 97 int err; 98 99 get_random_bytes(&tipc_random, sizeof(tipc_random)); 100 101 err = tipc_sk_ref_table_init(tipc_max_ports, tipc_random); 102 if (err) 103 goto out_reftbl; 104 105 err = tipc_nametbl_init(); 106 if (err) 107 goto out_nametbl; 108 109 err = tipc_netlink_start(); 110 if (err) 111 goto out_netlink; 112 113 err = tipc_socket_init(); 114 if (err) 115 goto out_socket; 116 117 err = tipc_register_sysctl(); 118 if (err) 119 goto out_sysctl; 120 121 err = tipc_subscr_start(); 122 if (err) 123 goto out_subscr; 124 125 err = tipc_bearer_setup(); 126 if (err) 127 goto out_bearer; 128 129 return 0; 130 out_bearer: 131 tipc_subscr_stop(); 132 out_subscr: 133 tipc_unregister_sysctl(); 134 out_sysctl: 135 tipc_socket_stop(); 136 out_socket: 137 tipc_netlink_stop(); 138 out_netlink: 139 tipc_nametbl_stop(); 140 out_nametbl: 141 tipc_sk_ref_table_stop(); 142 out_reftbl: 143 return err; 144 } 145 146 static int __init tipc_init(void) 147 { 148 int res; 149 150 pr_info("Activated (version " TIPC_MOD_VER ")\n"); 151 152 tipc_own_addr = 0; 153 tipc_max_ports = CONFIG_TIPC_PORTS; 154 tipc_net_id = 4711; 155 156 sysctl_tipc_rmem[0] = TIPC_CONN_OVERLOAD_LIMIT >> 4 << 157 TIPC_LOW_IMPORTANCE; 158 sysctl_tipc_rmem[1] = TIPC_CONN_OVERLOAD_LIMIT >> 4 << 159 TIPC_CRITICAL_IMPORTANCE; 160 sysctl_tipc_rmem[2] = TIPC_CONN_OVERLOAD_LIMIT; 161 162 res = tipc_core_start(); 163 if (res) 164 pr_err("Unable to start in single node mode\n"); 165 else 166 pr_info("Started in single node mode\n"); 167 return res; 168 } 169 170 static void __exit tipc_exit(void) 171 { 172 tipc_core_stop(); 173 pr_info("Deactivated\n"); 174 } 175 176 module_init(tipc_init); 177 module_exit(tipc_exit); 178 179 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication"); 180 MODULE_LICENSE("Dual BSD/GPL"); 181 MODULE_VERSION(TIPC_MOD_VER); 182