xref: /linux/net/tipc/core.c (revision 2c63221cd9e5c0dad0424029aeb1c40faada8330)
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
38 
39 #include "core.h"
40 #include "name_table.h"
41 #include "subscr.h"
42 #include "bearer.h"
43 #include "net.h"
44 #include "socket.h"
45 #include "bcast.h"
46 #include "node.h"
47 
48 #include <linux/module.h>
49 
50 /* configurable TIPC parameters */
51 unsigned int tipc_net_id __read_mostly;
52 int sysctl_tipc_rmem[3] __read_mostly;	/* min/default/max */
53 
54 static int __net_init tipc_init_net(struct net *net)
55 {
56 	struct tipc_net *tn = net_generic(net, tipc_net_id);
57 	int err;
58 
59 	tn->net_id = 4711;
60 	tn->node_addr = 0;
61 	tn->trial_addr = 0;
62 	tn->addr_trial_end = 0;
63 	tn->capabilities = TIPC_NODE_CAPABILITIES;
64 	memset(tn->node_id, 0, sizeof(tn->node_id));
65 	memset(tn->node_id_string, 0, sizeof(tn->node_id_string));
66 	tn->mon_threshold = TIPC_DEF_MON_THRESHOLD;
67 	get_random_bytes(&tn->random, sizeof(int));
68 	INIT_LIST_HEAD(&tn->node_list);
69 	spin_lock_init(&tn->node_list_lock);
70 
71 	err = tipc_sk_rht_init(net);
72 	if (err)
73 		goto out_sk_rht;
74 
75 	err = tipc_nametbl_init(net);
76 	if (err)
77 		goto out_nametbl;
78 
79 	INIT_LIST_HEAD(&tn->dist_queue);
80 
81 	err = tipc_bcast_init(net);
82 	if (err)
83 		goto out_bclink;
84 
85 	err = tipc_attach_loopback(net);
86 	if (err)
87 		goto out_bclink;
88 
89 	return 0;
90 
91 out_bclink:
92 	tipc_nametbl_stop(net);
93 out_nametbl:
94 	tipc_sk_rht_destroy(net);
95 out_sk_rht:
96 	return err;
97 }
98 
99 static void __net_exit tipc_exit_net(struct net *net)
100 {
101 	tipc_detach_loopback(net);
102 	tipc_net_stop(net);
103 	tipc_bcast_stop(net);
104 	tipc_nametbl_stop(net);
105 	tipc_sk_rht_destroy(net);
106 }
107 
108 static void __net_exit tipc_pernet_pre_exit(struct net *net)
109 {
110 	tipc_node_pre_cleanup_net(net);
111 }
112 
113 static struct pernet_operations tipc_pernet_pre_exit_ops = {
114 	.pre_exit = tipc_pernet_pre_exit,
115 };
116 
117 static struct pernet_operations tipc_net_ops = {
118 	.init = tipc_init_net,
119 	.exit = tipc_exit_net,
120 	.id   = &tipc_net_id,
121 	.size = sizeof(struct tipc_net),
122 };
123 
124 static struct pernet_operations tipc_topsrv_net_ops = {
125 	.init = tipc_topsrv_init_net,
126 	.exit = tipc_topsrv_exit_net,
127 };
128 
129 static int __init tipc_init(void)
130 {
131 	int err;
132 
133 	pr_info("Activated (version " TIPC_MOD_VER ")\n");
134 
135 	sysctl_tipc_rmem[0] = RCVBUF_MIN;
136 	sysctl_tipc_rmem[1] = RCVBUF_DEF;
137 	sysctl_tipc_rmem[2] = RCVBUF_MAX;
138 
139 	err = tipc_netlink_start();
140 	if (err)
141 		goto out_netlink;
142 
143 	err = tipc_netlink_compat_start();
144 	if (err)
145 		goto out_netlink_compat;
146 
147 	err = tipc_register_sysctl();
148 	if (err)
149 		goto out_sysctl;
150 
151 	err = register_pernet_device(&tipc_net_ops);
152 	if (err)
153 		goto out_pernet;
154 
155 	err = tipc_socket_init();
156 	if (err)
157 		goto out_socket;
158 
159 	err = register_pernet_device(&tipc_topsrv_net_ops);
160 	if (err)
161 		goto out_pernet_topsrv;
162 
163 	err = register_pernet_subsys(&tipc_pernet_pre_exit_ops);
164 	if (err)
165 		goto out_register_pernet_subsys;
166 
167 	err = tipc_bearer_setup();
168 	if (err)
169 		goto out_bearer;
170 
171 	pr_info("Started in single node mode\n");
172 	return 0;
173 out_bearer:
174 	unregister_pernet_subsys(&tipc_pernet_pre_exit_ops);
175 out_register_pernet_subsys:
176 	unregister_pernet_device(&tipc_topsrv_net_ops);
177 out_pernet_topsrv:
178 	tipc_socket_stop();
179 out_socket:
180 	unregister_pernet_device(&tipc_net_ops);
181 out_pernet:
182 	tipc_unregister_sysctl();
183 out_sysctl:
184 	tipc_netlink_compat_stop();
185 out_netlink_compat:
186 	tipc_netlink_stop();
187 out_netlink:
188 	pr_err("Unable to start in single node mode\n");
189 	return err;
190 }
191 
192 static void __exit tipc_exit(void)
193 {
194 	tipc_bearer_cleanup();
195 	unregister_pernet_subsys(&tipc_pernet_pre_exit_ops);
196 	unregister_pernet_device(&tipc_topsrv_net_ops);
197 	tipc_socket_stop();
198 	unregister_pernet_device(&tipc_net_ops);
199 	tipc_netlink_stop();
200 	tipc_netlink_compat_stop();
201 	tipc_unregister_sysctl();
202 
203 	pr_info("Deactivated\n");
204 }
205 
206 module_init(tipc_init);
207 module_exit(tipc_exit);
208 
209 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
210 MODULE_LICENSE("Dual BSD/GPL");
211 MODULE_VERSION(TIPC_MOD_VER);
212