| 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 | tipc_ib_media_stop(); |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * start_net - start TIPC networking sub-systems |
| 90 | */ |
| 91 | int tipc_core_start_net(unsigned long addr) |
| 92 | { |
| 93 | int res; |
| 94 | |
| 95 | tipc_net_start(addr); |
| 96 | res = tipc_eth_media_start(); |
| 97 | if (res < 0) |
| 98 | goto err; |
| 99 | res = tipc_ib_media_start(); |
| 100 | if (res < 0) |
| 101 | goto err; |
| 102 | return res; |
| 103 | |
| 104 | err: |
| 105 | tipc_core_stop_net(); |
| 106 | return res; |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode |
| 111 | */ |
| 112 | static void tipc_core_stop(void) |
| 113 | { |
| 114 | tipc_netlink_stop(); |
| 115 | tipc_handler_stop(); |
| 116 | tipc_cfg_stop(); |
| 117 | tipc_subscr_stop(); |
| 118 | tipc_nametbl_stop(); |
| 119 | tipc_ref_table_stop(); |
| 120 | tipc_socket_stop(); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode |
| 125 | */ |
| 126 | static int tipc_core_start(void) |
| 127 | { |
| 128 | int res; |
| 129 | |
| 130 | get_random_bytes(&tipc_random, sizeof(tipc_random)); |
| 131 | |
| 132 | res = tipc_handler_start(); |
| 133 | if (!res) |
| 134 | res = tipc_ref_table_init(tipc_max_ports, tipc_random); |
| 135 | if (!res) |
| 136 | res = tipc_nametbl_init(); |
| 137 | if (!res) |
| 138 | res = tipc_subscr_start(); |
| 139 | if (!res) |
| 140 | res = tipc_cfg_init(); |
| 141 | if (!res) |
| 142 | res = tipc_netlink_start(); |
| 143 | if (!res) |
| 144 | res = tipc_socket_init(); |
| 145 | if (res) |
| 146 | tipc_core_stop(); |
| 147 | |
| 148 | return res; |
| 149 | } |
| 150 | |
| 151 | |
| 152 | static int __init tipc_init(void) |
| 153 | { |
| 154 | int res; |
| 155 | |
| 156 | pr_info("Activated (version " TIPC_MOD_VER ")\n"); |
| 157 | |
| 158 | tipc_own_addr = 0; |
| 159 | tipc_remote_management = 1; |
| 160 | tipc_max_ports = CONFIG_TIPC_PORTS; |
| 161 | tipc_net_id = 4711; |
| 162 | |
| 163 | res = tipc_core_start(); |
| 164 | if (res) |
| 165 | pr_err("Unable to start in single node mode\n"); |
| 166 | else |
| 167 | pr_info("Started in single node mode\n"); |
| 168 | return res; |
| 169 | } |
| 170 | |
| 171 | static void __exit tipc_exit(void) |
| 172 | { |
| 173 | tipc_core_stop_net(); |
| 174 | tipc_core_stop(); |
| 175 | pr_info("Deactivated\n"); |
| 176 | } |
| 177 | |
| 178 | module_init(tipc_init); |
| 179 | module_exit(tipc_exit); |
| 180 | |
| 181 | MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication"); |
| 182 | MODULE_LICENSE("Dual BSD/GPL"); |
| 183 | MODULE_VERSION(TIPC_MOD_VER); |