Root/net/tipc/core.c

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
99int tipc_get_mode(void)
100{
101    return tipc_mode;
102}
103
104/**
105 * buf_acquire - creates a TIPC message buffer
106 * @size: message size (including TIPC header)
107 *
108 * Returns a new buffer with data pointers set to the specified size.
109 *
110 * NOTE: Headroom is reserved to allow prepending of a data link header.
111 * There may also be unrequested tailroom present at the buffer's end.
112 */
113
114struct sk_buff *buf_acquire(u32 size)
115{
116    struct sk_buff *skb;
117    unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
118
119    skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
120    if (skb) {
121        skb_reserve(skb, BUF_HEADROOM);
122        skb_put(skb, size);
123        skb->next = NULL;
124    }
125    return skb;
126}
127
128/**
129 * tipc_core_stop_net - shut down TIPC networking sub-systems
130 */
131
132void tipc_core_stop_net(void)
133{
134    tipc_eth_media_stop();
135    tipc_net_stop();
136}
137
138/**
139 * start_net - start TIPC networking sub-systems
140 */
141
142int tipc_core_start_net(unsigned long addr)
143{
144    int res;
145
146    if ((res = tipc_net_start(addr)) ||
147        (res = tipc_eth_media_start())) {
148        tipc_core_stop_net();
149    }
150    return res;
151}
152
153/**
154 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
155 */
156
157void tipc_core_stop(void)
158{
159    if (tipc_mode != TIPC_NODE_MODE)
160        return;
161
162    tipc_mode = TIPC_NOT_RUNNING;
163
164    tipc_netlink_stop();
165    tipc_handler_stop();
166    tipc_cfg_stop();
167    tipc_subscr_stop();
168    tipc_reg_stop();
169    tipc_nametbl_stop();
170    tipc_ref_table_stop();
171    tipc_socket_stop();
172}
173
174/**
175 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
176 */
177
178int tipc_core_start(void)
179{
180    int res;
181
182    if (tipc_mode != TIPC_NOT_RUNNING)
183        return -ENOPROTOOPT;
184
185    get_random_bytes(&tipc_random, sizeof(tipc_random));
186    tipc_mode = TIPC_NODE_MODE;
187
188    if ((res = tipc_handler_start()) ||
189        (res = tipc_ref_table_init(tipc_max_ports, tipc_random)) ||
190        (res = tipc_reg_start()) ||
191        (res = tipc_nametbl_init()) ||
192        (res = tipc_k_signal((Handler)tipc_subscr_start, 0)) ||
193        (res = tipc_k_signal((Handler)tipc_cfg_init, 0)) ||
194        (res = tipc_netlink_start()) ||
195        (res = tipc_socket_init())) {
196        tipc_core_stop();
197    }
198    return res;
199}
200
201
202static int __init tipc_init(void)
203{
204    int res;
205
206    tipc_log_resize(CONFIG_TIPC_LOG);
207    info("Activated (version " TIPC_MOD_VER
208         " compiled " __DATE__ " " __TIME__ ")\n");
209
210    tipc_own_addr = 0;
211    tipc_remote_management = 1;
212    tipc_max_publications = 10000;
213    tipc_max_subscriptions = 2000;
214    tipc_max_ports = CONFIG_TIPC_PORTS;
215    tipc_max_zones = CONFIG_TIPC_ZONES;
216    tipc_max_clusters = CONFIG_TIPC_CLUSTERS;
217    tipc_max_nodes = CONFIG_TIPC_NODES;
218    tipc_max_slaves = CONFIG_TIPC_SLAVE_NODES;
219    tipc_net_id = 4711;
220
221    if ((res = tipc_core_start()))
222        err("Unable to start in single node mode\n");
223    else
224        info("Started in single node mode\n");
225    return res;
226}
227
228static void __exit tipc_exit(void)
229{
230    tipc_core_stop_net();
231    tipc_core_stop();
232    info("Deactivated\n");
233    tipc_log_resize(0);
234}
235
236module_init(tipc_init);
237module_exit(tipc_exit);
238
239MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
240MODULE_LICENSE("Dual BSD/GPL");
241MODULE_VERSION(TIPC_MOD_VER);
242
243/* Native TIPC API for kernel-space applications (see tipc.h) */
244
245EXPORT_SYMBOL(tipc_attach);
246EXPORT_SYMBOL(tipc_detach);
247EXPORT_SYMBOL(tipc_get_addr);
248EXPORT_SYMBOL(tipc_get_mode);
249EXPORT_SYMBOL(tipc_createport);
250EXPORT_SYMBOL(tipc_deleteport);
251EXPORT_SYMBOL(tipc_ownidentity);
252EXPORT_SYMBOL(tipc_portimportance);
253EXPORT_SYMBOL(tipc_set_portimportance);
254EXPORT_SYMBOL(tipc_portunreliable);
255EXPORT_SYMBOL(tipc_set_portunreliable);
256EXPORT_SYMBOL(tipc_portunreturnable);
257EXPORT_SYMBOL(tipc_set_portunreturnable);
258EXPORT_SYMBOL(tipc_publish);
259EXPORT_SYMBOL(tipc_withdraw);
260EXPORT_SYMBOL(tipc_connect2port);
261EXPORT_SYMBOL(tipc_disconnect);
262EXPORT_SYMBOL(tipc_shutdown);
263EXPORT_SYMBOL(tipc_isconnected);
264EXPORT_SYMBOL(tipc_peer);
265EXPORT_SYMBOL(tipc_ref_valid);
266EXPORT_SYMBOL(tipc_send);
267EXPORT_SYMBOL(tipc_send_buf);
268EXPORT_SYMBOL(tipc_send2name);
269EXPORT_SYMBOL(tipc_forward2name);
270EXPORT_SYMBOL(tipc_send_buf2name);
271EXPORT_SYMBOL(tipc_forward_buf2name);
272EXPORT_SYMBOL(tipc_send2port);
273EXPORT_SYMBOL(tipc_forward2port);
274EXPORT_SYMBOL(tipc_send_buf2port);
275EXPORT_SYMBOL(tipc_forward_buf2port);
276EXPORT_SYMBOL(tipc_multicast);
277/* EXPORT_SYMBOL(tipc_multicast_buf); not available yet */
278EXPORT_SYMBOL(tipc_ispublished);
279EXPORT_SYMBOL(tipc_available_nodes);
280
281/* TIPC API for external bearers (see tipc_bearer.h) */
282
283EXPORT_SYMBOL(tipc_block_bearer);
284EXPORT_SYMBOL(tipc_continue);
285EXPORT_SYMBOL(tipc_disable_bearer);
286EXPORT_SYMBOL(tipc_enable_bearer);
287EXPORT_SYMBOL(tipc_recv_msg);
288EXPORT_SYMBOL(tipc_register_media);
289
290/* TIPC API for external APIs (see tipc_port.h) */
291
292EXPORT_SYMBOL(tipc_createport_raw);
293EXPORT_SYMBOL(tipc_reject_msg);
294EXPORT_SYMBOL(tipc_send_buf_fast);
295EXPORT_SYMBOL(tipc_acknowledge);
296EXPORT_SYMBOL(tipc_get_port);
297EXPORT_SYMBOL(tipc_get_handle);
298
299

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