Linux kernel mirror (for testing)
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1/*
2 * net/tipc/core.c: TIPC module code
3 *
4 * Copyright (c) 2003-2006, 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 "ref.h"
39#include "name_table.h"
40#include "subscr.h"
41#include "config.h"
42#include "port.h"
43
44#include <linux/module.h>
45
46/* global variables used by multiple sub-systems within TIPC */
47int tipc_random __read_mostly;
48
49/* configurable TIPC parameters */
50u32 tipc_own_addr __read_mostly;
51int tipc_max_ports __read_mostly;
52int tipc_net_id __read_mostly;
53int tipc_remote_management __read_mostly;
54int sysctl_tipc_rmem[3] __read_mostly; /* min/default/max */
55
56/**
57 * tipc_buf_acquire - creates a TIPC message buffer
58 * @size: message size (including TIPC header)
59 *
60 * Returns a new buffer with data pointers set to the specified size.
61 *
62 * NOTE: Headroom is reserved to allow prepending of a data link header.
63 * There may also be unrequested tailroom present at the buffer's end.
64 */
65struct sk_buff *tipc_buf_acquire(u32 size)
66{
67 struct sk_buff *skb;
68 unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
69
70 skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
71 if (skb) {
72 skb_reserve(skb, BUF_HEADROOM);
73 skb_put(skb, size);
74 skb->next = NULL;
75 }
76 return skb;
77}
78
79/**
80 * tipc_core_stop_net - shut down TIPC networking sub-systems
81 */
82static void tipc_core_stop_net(void)
83{
84 tipc_net_stop();
85 tipc_bearer_cleanup();
86}
87
88/**
89 * start_net - start TIPC networking sub-systems
90 */
91int tipc_core_start_net(unsigned long addr)
92{
93 int res;
94
95 tipc_net_start(addr);
96 res = tipc_bearer_setup();
97 if (res < 0)
98 goto err;
99 return res;
100
101err:
102 tipc_core_stop_net();
103 return res;
104}
105
106/**
107 * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
108 */
109static void tipc_core_stop(void)
110{
111 tipc_netlink_stop();
112 tipc_cfg_stop();
113 tipc_subscr_stop();
114 tipc_nametbl_stop();
115 tipc_ref_table_stop();
116 tipc_socket_stop();
117 tipc_unregister_sysctl();
118}
119
120/**
121 * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
122 */
123static int tipc_core_start(void)
124{
125 int res;
126
127 get_random_bytes(&tipc_random, sizeof(tipc_random));
128
129 res = tipc_handler_start();
130 if (!res)
131 res = tipc_ref_table_init(tipc_max_ports, tipc_random);
132 if (!res)
133 res = tipc_nametbl_init();
134 if (!res)
135 res = tipc_netlink_start();
136 if (!res)
137 res = tipc_socket_init();
138 if (!res)
139 res = tipc_register_sysctl();
140 if (!res)
141 res = tipc_subscr_start();
142 if (!res)
143 res = tipc_cfg_init();
144 if (res) {
145 tipc_handler_stop();
146 tipc_core_stop();
147 }
148 return res;
149}
150
151static int __init tipc_init(void)
152{
153 int res;
154
155 pr_info("Activated (version " TIPC_MOD_VER ")\n");
156
157 tipc_own_addr = 0;
158 tipc_remote_management = 1;
159 tipc_max_ports = CONFIG_TIPC_PORTS;
160 tipc_net_id = 4711;
161
162 sysctl_tipc_rmem[0] = CONN_OVERLOAD_LIMIT >> 4 << TIPC_LOW_IMPORTANCE;
163 sysctl_tipc_rmem[1] = CONN_OVERLOAD_LIMIT >> 4 <<
164 TIPC_CRITICAL_IMPORTANCE;
165 sysctl_tipc_rmem[2] = CONN_OVERLOAD_LIMIT;
166
167 res = tipc_core_start();
168 if (res)
169 pr_err("Unable to start in single node mode\n");
170 else
171 pr_info("Started in single node mode\n");
172 return res;
173}
174
175static void __exit tipc_exit(void)
176{
177 tipc_handler_stop();
178 tipc_core_stop_net();
179 tipc_core_stop();
180 pr_info("Deactivated\n");
181}
182
183module_init(tipc_init);
184module_exit(tipc_exit);
185
186MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
187MODULE_LICENSE("Dual BSD/GPL");
188MODULE_VERSION(TIPC_MOD_VER);