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