1/*
2 * net/tipc/core.c: TIPC module code
3 *
4 * Copyright (c) 2003-2006, Ericsson AB
5 * Copyright (c) 2005-2006, 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 <linux/init.h>
38#include <linux/module.h>
39#include <linux/kernel.h>
40#include <linux/random.h>
41
42#include "core.h"
43#include "dbg.h"
44#include "ref.h"
45#include "net.h"
46#include "user_reg.h"
47#include "name_table.h"
48#include "subscr.h"
49#include "config.h"
50
51int  tipc_eth_media_start(void);
52void tipc_eth_media_stop(void);
53int  tipc_handler_start(void);
54void tipc_handler_stop(void);
55int  tipc_socket_init(void);
56void tipc_socket_stop(void);
57int  tipc_netlink_start(void);
58void tipc_netlink_stop(void);
59
60#define TIPC_MOD_VER "1.6.2"
61
62#ifndef CONFIG_TIPC_ZONES
63#define CONFIG_TIPC_ZONES 3
64#endif
65
66#ifndef CONFIG_TIPC_CLUSTERS
67#define CONFIG_TIPC_CLUSTERS 1
68#endif
69
70#ifndef CONFIG_TIPC_NODES
71#define CONFIG_TIPC_NODES 255
72#endif
73
74#ifndef CONFIG_TIPC_SLAVE_NODES
75#define CONFIG_TIPC_SLAVE_NODES 0
76#endif
77
78#ifndef CONFIG_TIPC_PORTS
79#define CONFIG_TIPC_PORTS 8191
80#endif
81
82#ifndef CONFIG_TIPC_LOG
83#define CONFIG_TIPC_LOG 0
84#endif
85
86/* global variables used by multiple sub-systems within TIPC */
87
88int tipc_mode = TIPC_NOT_RUNNING;
89int tipc_random;
90atomic_t tipc_user_count = ATOMIC_INIT(0);
91
92const char tipc_alphabet[] =
93	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
94
95/* configurable TIPC parameters */
96
97u32 tipc_own_addr;
98int tipc_max_zones;
99int tipc_max_clusters;
100int tipc_max_nodes;
101int tipc_max_slaves;
102int tipc_max_ports;
103int tipc_max_subscriptions;
104int tipc_max_publications;
105int tipc_net_id;
106int tipc_remote_management;
107
108
109int tipc_get_mode(void)
110{
111	return tipc_mode;
112}
113
114/**
115 * tipc_core_stop_net - shut down TIPC networking sub-systems
116 */
117
118void tipc_core_stop_net(void)
119{
120	tipc_eth_media_stop();
121	tipc_net_stop();
122}
123
124/**
125 * start_net - start TIPC networking sub-systems
126 */
127
128int tipc_core_start_net(void)
129{
130	int res;
131
132	if ((res = tipc_net_start()) ||
133	    (res = tipc_eth_media_start())) {
134		tipc_core_stop_net();
135	}
136	return res;
137}
138
139/**
140 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
141 */
142
143void tipc_core_stop(void)
144{
145	if (tipc_mode != TIPC_NODE_MODE)
146		return;
147
148	tipc_mode = TIPC_NOT_RUNNING;
149
150	tipc_netlink_stop();
151	tipc_handler_stop();
152	tipc_cfg_stop();
153	tipc_subscr_stop();
154	tipc_reg_stop();
155	tipc_nametbl_stop();
156	tipc_ref_table_stop();
157	tipc_socket_stop();
158}
159
160/**
161 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
162 */
163
164int tipc_core_start(void)
165{
166	int res;
167
168	if (tipc_mode != TIPC_NOT_RUNNING)
169		return -ENOPROTOOPT;
170
171	get_random_bytes(&tipc_random, sizeof(tipc_random));
172	tipc_mode = TIPC_NODE_MODE;
173
174	if ((res = tipc_handler_start()) ||
175	    (res = tipc_ref_table_init(tipc_max_ports + tipc_max_subscriptions,
176				       tipc_random)) ||
177	    (res = tipc_reg_start()) ||
178	    (res = tipc_nametbl_init()) ||
179	    (res = tipc_k_signal((Handler)tipc_subscr_start, 0)) ||
180	    (res = tipc_k_signal((Handler)tipc_cfg_init, 0)) ||
181	    (res = tipc_netlink_start()) ||
182	    (res = tipc_socket_init())) {
183		tipc_core_stop();
184	}
185	return res;
186}
187
188
189static int __init tipc_init(void)
190{
191	int res;
192
193	tipc_log_reinit(CONFIG_TIPC_LOG);
194	info("Activated (version " TIPC_MOD_VER
195	     " compiled " __DATE__ " " __TIME__ ")\n");
196
197	tipc_own_addr = 0;
198	tipc_remote_management = 1;
199	tipc_max_publications = 10000;
200	tipc_max_subscriptions = 2000;
201	tipc_max_ports = delimit(CONFIG_TIPC_PORTS, 127, 65536);
202	tipc_max_zones = delimit(CONFIG_TIPC_ZONES, 1, 255);
203	tipc_max_clusters = delimit(CONFIG_TIPC_CLUSTERS, 1, 1);
204	tipc_max_nodes = delimit(CONFIG_TIPC_NODES, 8, 2047);
205	tipc_max_slaves = delimit(CONFIG_TIPC_SLAVE_NODES, 0, 2047);
206	tipc_net_id = 4711;
207
208	if ((res = tipc_core_start()))
209		err("Unable to start in single node mode\n");
210	else
211		info("Started in single node mode\n");
212	return res;
213}
214
215static void __exit tipc_exit(void)
216{
217	tipc_core_stop_net();
218	tipc_core_stop();
219	info("Deactivated\n");
220	tipc_log_stop();
221}
222
223module_init(tipc_init);
224module_exit(tipc_exit);
225
226MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
227MODULE_LICENSE("Dual BSD/GPL");
228MODULE_VERSION(TIPC_MOD_VER);
229
230/* Native TIPC API for kernel-space applications (see tipc.h) */
231
232EXPORT_SYMBOL(tipc_attach);
233EXPORT_SYMBOL(tipc_detach);
234EXPORT_SYMBOL(tipc_get_addr);
235EXPORT_SYMBOL(tipc_get_mode);
236EXPORT_SYMBOL(tipc_createport);
237EXPORT_SYMBOL(tipc_deleteport);
238EXPORT_SYMBOL(tipc_ownidentity);
239EXPORT_SYMBOL(tipc_portimportance);
240EXPORT_SYMBOL(tipc_set_portimportance);
241EXPORT_SYMBOL(tipc_portunreliable);
242EXPORT_SYMBOL(tipc_set_portunreliable);
243EXPORT_SYMBOL(tipc_portunreturnable);
244EXPORT_SYMBOL(tipc_set_portunreturnable);
245EXPORT_SYMBOL(tipc_publish);
246EXPORT_SYMBOL(tipc_withdraw);
247EXPORT_SYMBOL(tipc_connect2port);
248EXPORT_SYMBOL(tipc_disconnect);
249EXPORT_SYMBOL(tipc_shutdown);
250EXPORT_SYMBOL(tipc_isconnected);
251EXPORT_SYMBOL(tipc_peer);
252EXPORT_SYMBOL(tipc_ref_valid);
253EXPORT_SYMBOL(tipc_send);
254EXPORT_SYMBOL(tipc_send_buf);
255EXPORT_SYMBOL(tipc_send2name);
256EXPORT_SYMBOL(tipc_forward2name);
257EXPORT_SYMBOL(tipc_send_buf2name);
258EXPORT_SYMBOL(tipc_forward_buf2name);
259EXPORT_SYMBOL(tipc_send2port);
260EXPORT_SYMBOL(tipc_forward2port);
261EXPORT_SYMBOL(tipc_send_buf2port);
262EXPORT_SYMBOL(tipc_forward_buf2port);
263EXPORT_SYMBOL(tipc_multicast);
264/* EXPORT_SYMBOL(tipc_multicast_buf); not available yet */
265EXPORT_SYMBOL(tipc_ispublished);
266EXPORT_SYMBOL(tipc_available_nodes);
267
268/* TIPC API for external bearers (see tipc_bearer.h) */
269
270EXPORT_SYMBOL(tipc_block_bearer);
271EXPORT_SYMBOL(tipc_continue);
272EXPORT_SYMBOL(tipc_disable_bearer);
273EXPORT_SYMBOL(tipc_enable_bearer);
274EXPORT_SYMBOL(tipc_recv_msg);
275EXPORT_SYMBOL(tipc_register_media);
276
277/* TIPC API for external APIs (see tipc_port.h) */
278
279EXPORT_SYMBOL(tipc_createport_raw);
280EXPORT_SYMBOL(tipc_set_msg_option);
281EXPORT_SYMBOL(tipc_reject_msg);
282EXPORT_SYMBOL(tipc_send_buf_fast);
283EXPORT_SYMBOL(tipc_acknowledge);
284EXPORT_SYMBOL(tipc_get_port);
285EXPORT_SYMBOL(tipc_get_handle);
286