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 <linux/module.h>
38
39 #include "core.h"
40 #include "ref.h"
41 #include "name_table.h"
42 #include "subscr.h"
43 #include "config.h"
44
45
46 #ifndef CONFIG_TIPC_PORTS
47 #define CONFIG_TIPC_PORTS 8191
48 #endif
49
50 #ifndef CONFIG_TIPC_LOG
51 #define CONFIG_TIPC_LOG 0
52 #endif
53
54 /* global variables used by multiple sub-systems within TIPC */
55
56 int tipc_random;
57
58 const char tipc_alphabet[] =
59 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
60
61 /* configurable TIPC parameters */
62
63 u32 tipc_own_addr;
64 int tipc_max_ports;
65 int tipc_max_subscriptions;
66 int tipc_max_publications;
67 int tipc_net_id;
68 int tipc_remote_management;
69
70
71 /**
72 * tipc_buf_acquire - creates a TIPC message buffer
73 * @size: message size (including TIPC header)
74 *
75 * Returns a new buffer with data pointers set to the specified size.
76 *
77 * NOTE: Headroom is reserved to allow prepending of a data link header.
78 * There may also be unrequested tailroom present at the buffer's end.
79 */
80
tipc_buf_acquire(u32 size)81 struct sk_buff *tipc_buf_acquire(u32 size)
82 {
83 struct sk_buff *skb;
84 unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
85
86 skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
87 if (skb) {
88 skb_reserve(skb, BUF_HEADROOM);
89 skb_put(skb, size);
90 skb->next = NULL;
91 }
92 return skb;
93 }
94
95 /**
96 * tipc_core_stop_net - shut down TIPC networking sub-systems
97 */
98
tipc_core_stop_net(void)99 static void tipc_core_stop_net(void)
100 {
101 tipc_net_stop();
102 tipc_eth_media_stop();
103 }
104
105 /**
106 * start_net - start TIPC networking sub-systems
107 */
108
tipc_core_start_net(unsigned long addr)109 int tipc_core_start_net(unsigned long addr)
110 {
111 int res;
112
113 res = tipc_net_start(addr);
114 if (!res)
115 res = tipc_eth_media_start();
116 if (res)
117 tipc_core_stop_net();
118 return res;
119 }
120
121 /**
122 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
123 */
124
tipc_core_stop(void)125 static void tipc_core_stop(void)
126 {
127 tipc_netlink_stop();
128 tipc_handler_stop();
129 tipc_cfg_stop();
130 tipc_subscr_stop();
131 tipc_nametbl_stop();
132 tipc_ref_table_stop();
133 tipc_socket_stop();
134 tipc_log_resize(0);
135 }
136
137 /**
138 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
139 */
140
tipc_core_start(void)141 static int tipc_core_start(void)
142 {
143 int res;
144
145 get_random_bytes(&tipc_random, sizeof(tipc_random));
146
147 res = tipc_handler_start();
148 if (!res)
149 res = tipc_ref_table_init(tipc_max_ports, tipc_random);
150 if (!res)
151 res = tipc_nametbl_init();
152 if (!res)
153 res = tipc_k_signal((Handler)tipc_subscr_start, 0);
154 if (!res)
155 res = tipc_k_signal((Handler)tipc_cfg_init, 0);
156 if (!res)
157 res = tipc_netlink_start();
158 if (!res)
159 res = tipc_socket_init();
160 if (res)
161 tipc_core_stop();
162
163 return res;
164 }
165
166
tipc_init(void)167 static int __init tipc_init(void)
168 {
169 int res;
170
171 if (tipc_log_resize(CONFIG_TIPC_LOG) != 0)
172 warn("Unable to create log buffer\n");
173
174 info("Activated (version " TIPC_MOD_VER ")\n");
175
176 tipc_own_addr = 0;
177 tipc_remote_management = 1;
178 tipc_max_publications = 10000;
179 tipc_max_subscriptions = 2000;
180 tipc_max_ports = CONFIG_TIPC_PORTS;
181 tipc_net_id = 4711;
182
183 res = tipc_core_start();
184 if (res)
185 err("Unable to start in single node mode\n");
186 else
187 info("Started in single node mode\n");
188 return res;
189 }
190
tipc_exit(void)191 static void __exit tipc_exit(void)
192 {
193 tipc_core_stop_net();
194 tipc_core_stop();
195 info("Deactivated\n");
196 }
197
198 module_init(tipc_init);
199 module_exit(tipc_exit);
200
201 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
202 MODULE_LICENSE("Dual BSD/GPL");
203 MODULE_VERSION(TIPC_MOD_VER);
204