Linux kernel mirror (for testing)
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linux
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
51
52#ifndef CONFIG_TIPC_ZONES
53#define CONFIG_TIPC_ZONES 3
54#endif
55
56#ifndef CONFIG_TIPC_CLUSTERS
57#define CONFIG_TIPC_CLUSTERS 1
58#endif
59
60#ifndef CONFIG_TIPC_NODES
61#define CONFIG_TIPC_NODES 255
62#endif
63
64#ifndef CONFIG_TIPC_SLAVE_NODES
65#define CONFIG_TIPC_SLAVE_NODES 0
66#endif
67
68#ifndef CONFIG_TIPC_PORTS
69#define CONFIG_TIPC_PORTS 8191
70#endif
71
72#ifndef CONFIG_TIPC_LOG
73#define CONFIG_TIPC_LOG 0
74#endif
75
76/* global variables used by multiple sub-systems within TIPC */
77
78int tipc_mode = TIPC_NOT_RUNNING;
79int tipc_random;
80atomic_t tipc_user_count = ATOMIC_INIT(0);
81
82const char tipc_alphabet[] =
83 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
84
85/* configurable TIPC parameters */
86
87u32 tipc_own_addr;
88int tipc_max_zones;
89int tipc_max_clusters;
90int tipc_max_nodes;
91int tipc_max_slaves;
92int tipc_max_ports;
93int tipc_max_subscriptions;
94int tipc_max_publications;
95int tipc_net_id;
96int tipc_remote_management;
97
98
99/**
100 * tipc_buf_acquire - creates a TIPC message buffer
101 * @size: message size (including TIPC header)
102 *
103 * Returns a new buffer with data pointers set to the specified size.
104 *
105 * NOTE: Headroom is reserved to allow prepending of a data link header.
106 * There may also be unrequested tailroom present at the buffer's end.
107 */
108
109struct sk_buff *tipc_buf_acquire(u32 size)
110{
111 struct sk_buff *skb;
112 unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
113
114 skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
115 if (skb) {
116 skb_reserve(skb, BUF_HEADROOM);
117 skb_put(skb, size);
118 skb->next = NULL;
119 }
120 return skb;
121}
122
123/**
124 * tipc_core_stop_net - shut down TIPC networking sub-systems
125 */
126
127static void tipc_core_stop_net(void)
128{
129 tipc_eth_media_stop();
130 tipc_net_stop();
131}
132
133/**
134 * start_net - start TIPC networking sub-systems
135 */
136
137int tipc_core_start_net(unsigned long addr)
138{
139 int res;
140
141 if ((res = tipc_net_start(addr)) ||
142 (res = tipc_eth_media_start())) {
143 tipc_core_stop_net();
144 }
145 return res;
146}
147
148/**
149 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
150 */
151
152static void tipc_core_stop(void)
153{
154 if (tipc_mode != TIPC_NODE_MODE)
155 return;
156
157 tipc_mode = TIPC_NOT_RUNNING;
158
159 tipc_netlink_stop();
160 tipc_handler_stop();
161 tipc_cfg_stop();
162 tipc_subscr_stop();
163 tipc_reg_stop();
164 tipc_nametbl_stop();
165 tipc_ref_table_stop();
166 tipc_socket_stop();
167 tipc_log_resize(0);
168}
169
170/**
171 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
172 */
173
174static int tipc_core_start(void)
175{
176 int res;
177
178 if (tipc_mode != TIPC_NOT_RUNNING)
179 return -ENOPROTOOPT;
180
181 get_random_bytes(&tipc_random, sizeof(tipc_random));
182 tipc_mode = TIPC_NODE_MODE;
183
184 if ((res = tipc_handler_start()) ||
185 (res = tipc_ref_table_init(tipc_max_ports, tipc_random)) ||
186 (res = tipc_reg_start()) ||
187 (res = tipc_nametbl_init()) ||
188 (res = tipc_k_signal((Handler)tipc_subscr_start, 0)) ||
189 (res = tipc_k_signal((Handler)tipc_cfg_init, 0)) ||
190 (res = tipc_netlink_start()) ||
191 (res = tipc_socket_init())) {
192 tipc_core_stop();
193 }
194 return res;
195}
196
197
198static int __init tipc_init(void)
199{
200 int res;
201
202 if (tipc_log_resize(CONFIG_TIPC_LOG) != 0)
203 warn("Unable to create log buffer\n");
204
205 info("Activated (version " TIPC_MOD_VER
206 " compiled " __DATE__ " " __TIME__ ")\n");
207
208 tipc_own_addr = 0;
209 tipc_remote_management = 1;
210 tipc_max_publications = 10000;
211 tipc_max_subscriptions = 2000;
212 tipc_max_ports = CONFIG_TIPC_PORTS;
213 tipc_max_zones = CONFIG_TIPC_ZONES;
214 tipc_max_clusters = CONFIG_TIPC_CLUSTERS;
215 tipc_max_nodes = CONFIG_TIPC_NODES;
216 tipc_max_slaves = CONFIG_TIPC_SLAVE_NODES;
217 tipc_net_id = 4711;
218
219 if ((res = tipc_core_start()))
220 err("Unable to start in single node mode\n");
221 else
222 info("Started in single node mode\n");
223 return res;
224}
225
226static void __exit tipc_exit(void)
227{
228 tipc_core_stop_net();
229 tipc_core_stop();
230 info("Deactivated\n");
231}
232
233module_init(tipc_init);
234module_exit(tipc_exit);
235
236MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
237MODULE_LICENSE("Dual BSD/GPL");
238MODULE_VERSION(TIPC_MOD_VER);
239
240/* Native TIPC API for kernel-space applications (see tipc.h) */
241
242EXPORT_SYMBOL(tipc_attach);
243EXPORT_SYMBOL(tipc_detach);
244EXPORT_SYMBOL(tipc_createport);
245EXPORT_SYMBOL(tipc_deleteport);
246EXPORT_SYMBOL(tipc_ownidentity);
247EXPORT_SYMBOL(tipc_portimportance);
248EXPORT_SYMBOL(tipc_set_portimportance);
249EXPORT_SYMBOL(tipc_portunreliable);
250EXPORT_SYMBOL(tipc_set_portunreliable);
251EXPORT_SYMBOL(tipc_portunreturnable);
252EXPORT_SYMBOL(tipc_set_portunreturnable);
253EXPORT_SYMBOL(tipc_publish);
254EXPORT_SYMBOL(tipc_withdraw);
255EXPORT_SYMBOL(tipc_connect2port);
256EXPORT_SYMBOL(tipc_disconnect);
257EXPORT_SYMBOL(tipc_shutdown);
258EXPORT_SYMBOL(tipc_send);
259EXPORT_SYMBOL(tipc_send2name);
260EXPORT_SYMBOL(tipc_send2port);
261EXPORT_SYMBOL(tipc_multicast);
262
263/* TIPC API for external bearers (see tipc_bearer.h) */
264
265EXPORT_SYMBOL(tipc_block_bearer);
266EXPORT_SYMBOL(tipc_continue);
267EXPORT_SYMBOL(tipc_disable_bearer);
268EXPORT_SYMBOL(tipc_enable_bearer);
269EXPORT_SYMBOL(tipc_recv_msg);
270EXPORT_SYMBOL(tipc_register_media);
271
272/* TIPC API for external APIs (see tipc_port.h) */
273
274EXPORT_SYMBOL(tipc_createport_raw);
275EXPORT_SYMBOL(tipc_reject_msg);
276EXPORT_SYMBOL(tipc_send_buf_fast);
277EXPORT_SYMBOL(tipc_acknowledge);
278