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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#ifndef CONFIG_TIPC_PORTS
46#define CONFIG_TIPC_PORTS 8191
47#endif
48
49
50/* global variables used by multiple sub-systems within TIPC */
51int tipc_random;
52
53const char tipc_alphabet[] =
54 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
55
56/* configurable TIPC parameters */
57u32 tipc_own_addr;
58int tipc_max_ports;
59int tipc_max_subscriptions;
60int tipc_max_publications;
61int tipc_net_id;
62int tipc_remote_management;
63
64
65/**
66 * tipc_buf_acquire - creates a TIPC message buffer
67 * @size: message size (including TIPC header)
68 *
69 * Returns a new buffer with data pointers set to the specified size.
70 *
71 * NOTE: Headroom is reserved to allow prepending of a data link header.
72 * There may also be unrequested tailroom present at the buffer's end.
73 */
74struct sk_buff *tipc_buf_acquire(u32 size)
75{
76 struct sk_buff *skb;
77 unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
78
79 skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
80 if (skb) {
81 skb_reserve(skb, BUF_HEADROOM);
82 skb_put(skb, size);
83 skb->next = NULL;
84 }
85 return skb;
86}
87
88/**
89 * tipc_core_stop_net - shut down TIPC networking sub-systems
90 */
91static void tipc_core_stop_net(void)
92{
93 tipc_net_stop();
94 tipc_eth_media_stop();
95}
96
97/**
98 * start_net - start TIPC networking sub-systems
99 */
100int tipc_core_start_net(unsigned long addr)
101{
102 int res;
103
104 res = tipc_net_start(addr);
105 if (!res)
106 res = tipc_eth_media_start();
107 if (res)
108 tipc_core_stop_net();
109 return res;
110}
111
112/**
113 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
114 */
115static void tipc_core_stop(void)
116{
117 tipc_netlink_stop();
118 tipc_handler_stop();
119 tipc_cfg_stop();
120 tipc_subscr_stop();
121 tipc_nametbl_stop();
122 tipc_ref_table_stop();
123 tipc_socket_stop();
124}
125
126/**
127 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
128 */
129static int tipc_core_start(void)
130{
131 int res;
132
133 get_random_bytes(&tipc_random, sizeof(tipc_random));
134
135 res = tipc_handler_start();
136 if (!res)
137 res = tipc_ref_table_init(tipc_max_ports, tipc_random);
138 if (!res)
139 res = tipc_nametbl_init();
140 if (!res)
141 res = tipc_subscr_start();
142 if (!res)
143 res = tipc_cfg_init();
144 if (!res)
145 res = tipc_netlink_start();
146 if (!res)
147 res = tipc_socket_init();
148 if (res)
149 tipc_core_stop();
150
151 return res;
152}
153
154
155static int __init tipc_init(void)
156{
157 int res;
158
159 pr_info("Activated (version " TIPC_MOD_VER ")\n");
160
161 tipc_own_addr = 0;
162 tipc_remote_management = 1;
163 tipc_max_publications = 10000;
164 tipc_max_subscriptions = 2000;
165 tipc_max_ports = CONFIG_TIPC_PORTS;
166 tipc_net_id = 4711;
167
168 res = tipc_core_start();
169 if (res)
170 pr_err("Unable to start in single node mode\n");
171 else
172 pr_info("Started in single node mode\n");
173 return res;
174}
175
176static void __exit tipc_exit(void)
177{
178 tipc_core_stop_net();
179 tipc_core_stop();
180 pr_info("Deactivated\n");
181}
182
183module_init(tipc_init);
184module_exit(tipc_exit);
185
186MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
187MODULE_LICENSE("Dual BSD/GPL");
188MODULE_VERSION(TIPC_MOD_VER);