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Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/core.c: TIPC module code
3 *
Per Liden9da1c8b2006-01-11 18:40:41 +01004 * Copyright (c) 2003-2006, Ericsson AB
Ying Xue13a2e892013-06-17 10:54:40 -04005 * Copyright (c) 2005-2006, 2010-2013, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 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.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * 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
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
Per Lidenb97bf3f2006-01-02 19:04:38 +010037#include "core.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010038#include "ref.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010039#include "name_table.h"
40#include "subscr.h"
41#include "config.h"
Ying Xuecc79dd12013-06-17 10:54:37 -040042#include "port.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010043
Erik Hugne2cf8aa12012-06-29 00:16:37 -040044#include <linux/module.h>
Per Lidenb97bf3f2006-01-02 19:04:38 +010045
Per Lidenb97bf3f2006-01-02 19:04:38 +010046/* global variables used by multiple sub-systems within TIPC */
Ying Xue61cdd4d2012-08-16 12:09:12 +000047int tipc_random __read_mostly;
Per Lidenb97bf3f2006-01-02 19:04:38 +010048
Per Lidenb97bf3f2006-01-02 19:04:38 +010049/* configurable TIPC parameters */
Ying Xue61cdd4d2012-08-16 12:09:12 +000050u32 tipc_own_addr __read_mostly;
51int tipc_max_ports __read_mostly;
Ying Xue61cdd4d2012-08-16 12:09:12 +000052int tipc_net_id __read_mostly;
53int tipc_remote_management __read_mostly;
Ying Xuecc79dd12013-06-17 10:54:37 -040054int sysctl_tipc_rmem[3] __read_mostly; /* min/default/max */
Per Lidenb97bf3f2006-01-02 19:04:38 +010055
Per Lidenb97bf3f2006-01-02 19:04:38 +010056/**
stephen hemminger31e3c3f2010-10-13 13:20:35 +000057 * tipc_buf_acquire - creates a TIPC message buffer
Allan Stephens3032cca2010-05-11 14:30:17 +000058 * @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 */
stephen hemminger31e3c3f2010-10-13 13:20:35 +000065struct sk_buff *tipc_buf_acquire(u32 size)
Allan Stephens3032cca2010-05-11 14:30:17 +000066{
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/**
Per Liden4323add2006-01-18 00:38:21 +010080 * tipc_core_stop_net - shut down TIPC networking sub-systems
Per Lidenb97bf3f2006-01-02 19:04:38 +010081 */
stephen hemminger31e3c3f2010-10-13 13:20:35 +000082static void tipc_core_stop_net(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +010083{
Per Liden4323add2006-01-18 00:38:21 +010084 tipc_net_stop();
Ying Xue6e967ad2013-12-10 20:45:42 -080085 tipc_bearer_cleanup();
Per Lidenb97bf3f2006-01-02 19:04:38 +010086}
87
88/**
89 * start_net - start TIPC networking sub-systems
90 */
Allan Stephens03194372008-05-21 14:55:04 -070091int tipc_core_start_net(unsigned long addr)
Per Lidenb97bf3f2006-01-02 19:04:38 +010092{
93 int res;
94
Ying Xue379c0452012-08-16 12:09:10 +000095 tipc_net_start(addr);
Ying Xue6e967ad2013-12-10 20:45:42 -080096 res = tipc_bearer_setup();
Patrick McHardya29a1942013-04-17 06:18:28 +000097 if (res < 0)
98 goto err;
99 return res;
100
101err:
102 tipc_core_stop_net();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100103 return res;
104}
105
106/**
Per Liden4323add2006-01-18 00:38:21 +0100107 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
Per Lidenb97bf3f2006-01-02 19:04:38 +0100108 */
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000109static void tipc_core_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100110{
Per Liden4323add2006-01-18 00:38:21 +0100111 tipc_netlink_stop();
Per Liden4323add2006-01-18 00:38:21 +0100112 tipc_cfg_stop();
113 tipc_subscr_stop();
Per Liden4323add2006-01-18 00:38:21 +0100114 tipc_nametbl_stop();
115 tipc_ref_table_stop();
116 tipc_socket_stop();
Ying Xuecc79dd12013-06-17 10:54:37 -0400117 tipc_unregister_sysctl();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100118}
119
120/**
Per Liden4323add2006-01-18 00:38:21 +0100121 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
Per Lidenb97bf3f2006-01-02 19:04:38 +0100122 */
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000123static int tipc_core_start(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100124{
125 int res;
126
Per Lidenb97bf3f2006-01-02 19:04:38 +0100127 get_random_bytes(&tipc_random, sizeof(tipc_random));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100128
Allan Stephens2db99832010-12-31 18:59:33 +0000129 res = tipc_handler_start();
130 if (!res)
131 res = tipc_ref_table_init(tipc_max_ports, tipc_random);
132 if (!res)
133 res = tipc_nametbl_init();
134 if (!res)
Allan Stephens2db99832010-12-31 18:59:33 +0000135 res = tipc_netlink_start();
136 if (!res)
137 res = tipc_socket_init();
Ying Xuecc79dd12013-06-17 10:54:37 -0400138 if (!res)
139 res = tipc_register_sysctl();
Ying Xue13a2e892013-06-17 10:54:40 -0400140 if (!res)
141 res = tipc_subscr_start();
Ying Xue7d0ab172013-06-17 10:54:41 -0400142 if (!res)
143 res = tipc_cfg_init();
Jon Paul Maloy993b8582013-12-09 22:54:46 -0800144 if (res) {
145 tipc_handler_stop();
Per Liden4323add2006-01-18 00:38:21 +0100146 tipc_core_stop();
Jon Paul Maloy993b8582013-12-09 22:54:46 -0800147 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100148 return res;
149}
150
Per Lidenb97bf3f2006-01-02 19:04:38 +0100151static int __init tipc_init(void)
152{
153 int res;
154
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400155 pr_info("Activated (version " TIPC_MOD_VER ")\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100156
157 tipc_own_addr = 0;
158 tipc_remote_management = 1;
Amerigo Wangee983ac2009-12-24 17:26:48 +0000159 tipc_max_ports = CONFIG_TIPC_PORTS;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100160 tipc_net_id = 4711;
161
Ying Xuecc79dd12013-06-17 10:54:37 -0400162 sysctl_tipc_rmem[0] = CONN_OVERLOAD_LIMIT >> 4 << TIPC_LOW_IMPORTANCE;
163 sysctl_tipc_rmem[1] = CONN_OVERLOAD_LIMIT >> 4 <<
164 TIPC_CRITICAL_IMPORTANCE;
165 sysctl_tipc_rmem[2] = CONN_OVERLOAD_LIMIT;
166
Allan Stephens2db99832010-12-31 18:59:33 +0000167 res = tipc_core_start();
168 if (res)
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400169 pr_err("Unable to start in single node mode\n");
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900170 else
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400171 pr_info("Started in single node mode\n");
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900172 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100173}
174
175static void __exit tipc_exit(void)
176{
Jon Paul Maloy993b8582013-12-09 22:54:46 -0800177 tipc_handler_stop();
Per Liden4323add2006-01-18 00:38:21 +0100178 tipc_core_stop_net();
179 tipc_core_stop();
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400180 pr_info("Deactivated\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100181}
182
183module_init(tipc_init);
184module_exit(tipc_exit);
185
186MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
187MODULE_LICENSE("Dual BSD/GPL");
Allan Stephensa592ea62006-06-25 23:42:47 -0700188MODULE_VERSION(TIPC_MOD_VER);