xref: /openbmc/linux/net/tipc/core.c (revision c819e2cf)
1 /*
2  * net/tipc/core.c: TIPC module code
3  *
4  * Copyright (c) 2003-2006, 2013, Ericsson AB
5  * Copyright (c) 2005-2006, 2010-2013, 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 "name_table.h"
39 #include "subscr.h"
40 #include "config.h"
41 #include "socket.h"
42 
43 #include <linux/module.h>
44 
45 /* global variables used by multiple sub-systems within TIPC */
46 int tipc_random __read_mostly;
47 
48 /* configurable TIPC parameters */
49 u32 tipc_own_addr __read_mostly;
50 int tipc_max_ports __read_mostly;
51 int tipc_net_id __read_mostly;
52 int sysctl_tipc_rmem[3] __read_mostly;	/* min/default/max */
53 
54 /**
55  * tipc_buf_acquire - creates a TIPC message buffer
56  * @size: message size (including TIPC header)
57  *
58  * Returns a new buffer with data pointers set to the specified size.
59  *
60  * NOTE: Headroom is reserved to allow prepending of a data link header.
61  *       There may also be unrequested tailroom present at the buffer's end.
62  */
63 struct sk_buff *tipc_buf_acquire(u32 size)
64 {
65 	struct sk_buff *skb;
66 	unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
67 
68 	skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
69 	if (skb) {
70 		skb_reserve(skb, BUF_HEADROOM);
71 		skb_put(skb, size);
72 		skb->next = NULL;
73 	}
74 	return skb;
75 }
76 
77 /**
78  * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
79  */
80 static void tipc_core_stop(void)
81 {
82 	tipc_net_stop();
83 	tipc_bearer_cleanup();
84 	tipc_netlink_stop();
85 	tipc_subscr_stop();
86 	tipc_nametbl_stop();
87 	tipc_sk_ref_table_stop();
88 	tipc_socket_stop();
89 	tipc_unregister_sysctl();
90 }
91 
92 /**
93  * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
94  */
95 static int tipc_core_start(void)
96 {
97 	int err;
98 
99 	get_random_bytes(&tipc_random, sizeof(tipc_random));
100 
101 	err = tipc_sk_ref_table_init(tipc_max_ports, tipc_random);
102 	if (err)
103 		goto out_reftbl;
104 
105 	err = tipc_nametbl_init();
106 	if (err)
107 		goto out_nametbl;
108 
109 	err = tipc_netlink_start();
110 	if (err)
111 		goto out_netlink;
112 
113 	err = tipc_socket_init();
114 	if (err)
115 		goto out_socket;
116 
117 	err = tipc_register_sysctl();
118 	if (err)
119 		goto out_sysctl;
120 
121 	err = tipc_subscr_start();
122 	if (err)
123 		goto out_subscr;
124 
125 	err = tipc_bearer_setup();
126 	if (err)
127 		goto out_bearer;
128 
129 	return 0;
130 out_bearer:
131 	tipc_subscr_stop();
132 out_subscr:
133 	tipc_unregister_sysctl();
134 out_sysctl:
135 	tipc_socket_stop();
136 out_socket:
137 	tipc_netlink_stop();
138 out_netlink:
139 	tipc_nametbl_stop();
140 out_nametbl:
141 	tipc_sk_ref_table_stop();
142 out_reftbl:
143 	return err;
144 }
145 
146 static int __init tipc_init(void)
147 {
148 	int res;
149 
150 	pr_info("Activated (version " TIPC_MOD_VER ")\n");
151 
152 	tipc_own_addr = 0;
153 	tipc_max_ports = CONFIG_TIPC_PORTS;
154 	tipc_net_id = 4711;
155 
156 	sysctl_tipc_rmem[0] = TIPC_CONN_OVERLOAD_LIMIT >> 4 <<
157 			      TIPC_LOW_IMPORTANCE;
158 	sysctl_tipc_rmem[1] = TIPC_CONN_OVERLOAD_LIMIT >> 4 <<
159 			      TIPC_CRITICAL_IMPORTANCE;
160 	sysctl_tipc_rmem[2] = TIPC_CONN_OVERLOAD_LIMIT;
161 
162 	res = tipc_core_start();
163 	if (res)
164 		pr_err("Unable to start in single node mode\n");
165 	else
166 		pr_info("Started in single node mode\n");
167 	return res;
168 }
169 
170 static void __exit tipc_exit(void)
171 {
172 	tipc_core_stop();
173 	pr_info("Deactivated\n");
174 }
175 
176 module_init(tipc_init);
177 module_exit(tipc_exit);
178 
179 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
180 MODULE_LICENSE("Dual BSD/GPL");
181 MODULE_VERSION(TIPC_MOD_VER);
182