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
44 #ifndef CONFIG_TIPC_PORTS
45 #define CONFIG_TIPC_PORTS 8191
46 #endif
47
48 #ifndef CONFIG_TIPC_LOG
49 #define CONFIG_TIPC_LOG 0
50 #endif
51
52 /* global variables used by multiple sub-systems within TIPC */
53
54 int tipc_mode = TIPC_NOT_RUNNING;
55 int tipc_random;
56
57 const char tipc_alphabet[] =
58 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
59
60 /* configurable TIPC parameters */
61
62 u32 tipc_own_addr;
63 int tipc_max_ports;
64 int tipc_max_subscriptions;
65 int tipc_max_publications;
66 int tipc_net_id;
67 int tipc_remote_management;
68
69
70 /**
71 * tipc_buf_acquire - creates a TIPC message buffer
72 * @size: message size (including TIPC header)
73 *
74 * Returns a new buffer with data pointers set to the specified size.
75 *
76 * NOTE: Headroom is reserved to allow prepending of a data link header.
77 * There may also be unrequested tailroom present at the buffer's end.
78 */
79
tipc_buf_acquire(u32 size)80 struct sk_buff *tipc_buf_acquire(u32 size)
81 {
82 struct sk_buff *skb;
83 unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
84
85 skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
86 if (skb) {
87 skb_reserve(skb, BUF_HEADROOM);
88 skb_put(skb, size);
89 skb->next = NULL;
90 }
91 return skb;
92 }
93
94 /**
95 * tipc_core_stop_net - shut down TIPC networking sub-systems
96 */
97
tipc_core_stop_net(void)98 static void tipc_core_stop_net(void)
99 {
100 tipc_eth_media_stop();
101 tipc_net_stop();
102 }
103
104 /**
105 * start_net - start TIPC networking sub-systems
106 */
107
tipc_core_start_net(unsigned long addr)108 int tipc_core_start_net(unsigned long addr)
109 {
110 int res;
111
112 res = tipc_net_start(addr);
113 if (!res)
114 res = tipc_eth_media_start();
115 if (res)
116 tipc_core_stop_net();
117 return res;
118 }
119
120 /**
121 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
122 */
123
tipc_core_stop(void)124 static void tipc_core_stop(void)
125 {
126 if (tipc_mode != TIPC_NODE_MODE)
127 return;
128
129 tipc_mode = TIPC_NOT_RUNNING;
130
131 tipc_netlink_stop();
132 tipc_handler_stop();
133 tipc_cfg_stop();
134 tipc_subscr_stop();
135 tipc_nametbl_stop();
136 tipc_ref_table_stop();
137 tipc_socket_stop();
138 tipc_log_resize(0);
139 }
140
141 /**
142 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
143 */
144
tipc_core_start(void)145 static int tipc_core_start(void)
146 {
147 int res;
148
149 if (tipc_mode != TIPC_NOT_RUNNING)
150 return -ENOPROTOOPT;
151
152 get_random_bytes(&tipc_random, sizeof(tipc_random));
153 tipc_mode = TIPC_NODE_MODE;
154
155 res = tipc_handler_start();
156 if (!res)
157 res = tipc_ref_table_init(tipc_max_ports, tipc_random);
158 if (!res)
159 res = tipc_nametbl_init();
160 if (!res)
161 res = tipc_k_signal((Handler)tipc_subscr_start, 0);
162 if (!res)
163 res = tipc_k_signal((Handler)tipc_cfg_init, 0);
164 if (!res)
165 res = tipc_netlink_start();
166 if (!res)
167 res = tipc_socket_init();
168 if (res)
169 tipc_core_stop();
170
171 return res;
172 }
173
174
tipc_init(void)175 static int __init tipc_init(void)
176 {
177 int res;
178
179 if (tipc_log_resize(CONFIG_TIPC_LOG) != 0)
180 warn("Unable to create log buffer\n");
181
182 info("Activated (version " TIPC_MOD_VER
183 " compiled " __DATE__ " " __TIME__ ")\n");
184
185 tipc_own_addr = 0;
186 tipc_remote_management = 1;
187 tipc_max_publications = 10000;
188 tipc_max_subscriptions = 2000;
189 tipc_max_ports = CONFIG_TIPC_PORTS;
190 tipc_net_id = 4711;
191
192 res = tipc_core_start();
193 if (res)
194 err("Unable to start in single node mode\n");
195 else
196 info("Started in single node mode\n");
197 return res;
198 }
199
tipc_exit(void)200 static void __exit tipc_exit(void)
201 {
202 tipc_core_stop_net();
203 tipc_core_stop();
204 info("Deactivated\n");
205 }
206
207 module_init(tipc_init);
208 module_exit(tipc_exit);
209
210 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
211 MODULE_LICENSE("Dual BSD/GPL");
212 MODULE_VERSION(TIPC_MOD_VER);
213