xref: /openbmc/linux/net/ax25/sysctl_net_ax25.c (revision 7737e46d)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *
4  * Copyright (C) 1996 Mike Shaver (shaver@zeroknowledge.com)
5  */
6 #include <linux/mm.h>
7 #include <linux/slab.h>
8 #include <linux/sysctl.h>
9 #include <linux/spinlock.h>
10 #include <net/ax25.h>
11 
12 static int min_ipdefmode[1],    	max_ipdefmode[] = {1};
13 static int min_axdefmode[1],            max_axdefmode[] = {1};
14 static int min_backoff[1],		max_backoff[] = {2};
15 static int min_conmode[1],		max_conmode[] = {2};
16 static int min_window[] = {1},		max_window[] = {7};
17 static int min_ewindow[] = {1},		max_ewindow[] = {63};
18 static int min_t1[] = {1},		max_t1[] = {30000};
19 static int min_t2[] = {1},		max_t2[] = {20000};
20 static int min_t3[1],			max_t3[] = {3600000};
21 static int min_idle[1],			max_idle[] = {65535000};
22 static int min_n2[] = {1},		max_n2[] = {31};
23 static int min_paclen[] = {1},		max_paclen[] = {512};
24 static int min_proto[1],		max_proto[] = { AX25_PROTO_MAX };
25 #ifdef CONFIG_AX25_DAMA_SLAVE
26 static int min_ds_timeout[1],		max_ds_timeout[] = {65535000};
27 #endif
28 
29 static const struct ctl_table ax25_param_table[] = {
30 	{
31 		.procname	= "ip_default_mode",
32 		.maxlen		= sizeof(int),
33 		.mode		= 0644,
34 		.proc_handler	= proc_dointvec_minmax,
35 		.extra1		= &min_ipdefmode,
36 		.extra2		= &max_ipdefmode
37 	},
38 	{
39 		.procname	= "ax25_default_mode",
40 		.maxlen		= sizeof(int),
41 		.mode		= 0644,
42 		.proc_handler	= proc_dointvec_minmax,
43 		.extra1		= &min_axdefmode,
44 		.extra2		= &max_axdefmode
45 	},
46 	{
47 		.procname	= "backoff_type",
48 		.maxlen		= sizeof(int),
49 		.mode		= 0644,
50 		.proc_handler	= proc_dointvec_minmax,
51 		.extra1		= &min_backoff,
52 		.extra2		= &max_backoff
53 	},
54 	{
55 		.procname	= "connect_mode",
56 		.maxlen		= sizeof(int),
57 		.mode		= 0644,
58 		.proc_handler	= proc_dointvec_minmax,
59 		.extra1		= &min_conmode,
60 		.extra2		= &max_conmode
61 	},
62 	{
63 		.procname	= "standard_window_size",
64 		.maxlen		= sizeof(int),
65 		.mode		= 0644,
66 		.proc_handler	= proc_dointvec_minmax,
67 		.extra1		= &min_window,
68 		.extra2		= &max_window
69 	},
70 	{
71 		.procname	= "extended_window_size",
72 		.maxlen		= sizeof(int),
73 		.mode		= 0644,
74 		.proc_handler	= proc_dointvec_minmax,
75 		.extra1		= &min_ewindow,
76 		.extra2		= &max_ewindow
77 	},
78 	{
79 		.procname	= "t1_timeout",
80 		.maxlen		= sizeof(int),
81 		.mode		= 0644,
82 		.proc_handler	= proc_dointvec_minmax,
83 		.extra1		= &min_t1,
84 		.extra2		= &max_t1
85 	},
86 	{
87 		.procname	= "t2_timeout",
88 		.maxlen		= sizeof(int),
89 		.mode		= 0644,
90 		.proc_handler	= proc_dointvec_minmax,
91 		.extra1		= &min_t2,
92 		.extra2		= &max_t2
93 	},
94 	{
95 		.procname	= "t3_timeout",
96 		.maxlen		= sizeof(int),
97 		.mode		= 0644,
98 		.proc_handler	= proc_dointvec_minmax,
99 		.extra1		= &min_t3,
100 		.extra2		= &max_t3
101 	},
102 	{
103 		.procname	= "idle_timeout",
104 		.maxlen		= sizeof(int),
105 		.mode		= 0644,
106 		.proc_handler	= proc_dointvec_minmax,
107 		.extra1		= &min_idle,
108 		.extra2		= &max_idle
109 	},
110 	{
111 		.procname	= "maximum_retry_count",
112 		.maxlen		= sizeof(int),
113 		.mode		= 0644,
114 		.proc_handler	= proc_dointvec_minmax,
115 		.extra1		= &min_n2,
116 		.extra2		= &max_n2
117 	},
118 	{
119 		.procname	= "maximum_packet_length",
120 		.maxlen		= sizeof(int),
121 		.mode		= 0644,
122 		.proc_handler	= proc_dointvec_minmax,
123 		.extra1		= &min_paclen,
124 		.extra2		= &max_paclen
125 	},
126 	{
127 		.procname	= "protocol",
128 		.maxlen		= sizeof(int),
129 		.mode		= 0644,
130 		.proc_handler	= proc_dointvec_minmax,
131 		.extra1		= &min_proto,
132 		.extra2		= &max_proto
133 	},
134 #ifdef CONFIG_AX25_DAMA_SLAVE
135 	{
136 		.procname	= "dama_slave_timeout",
137 		.maxlen		= sizeof(int),
138 		.mode		= 0644,
139 		.proc_handler	= proc_dointvec_minmax,
140 		.extra1		= &min_ds_timeout,
141 		.extra2		= &max_ds_timeout
142 	},
143 #endif
144 
145 	{ }	/* that's all, folks! */
146 };
147 
ax25_register_dev_sysctl(ax25_dev * ax25_dev)148 int ax25_register_dev_sysctl(ax25_dev *ax25_dev)
149 {
150 	char path[sizeof("net/ax25/") + IFNAMSIZ];
151 	int k;
152 	struct ctl_table *table;
153 
154 	table = kmemdup(ax25_param_table, sizeof(ax25_param_table), GFP_KERNEL);
155 	if (!table)
156 		return -ENOMEM;
157 
158 	for (k = 0; k < AX25_MAX_VALUES; k++)
159 		table[k].data = &ax25_dev->values[k];
160 
161 	snprintf(path, sizeof(path), "net/ax25/%s", ax25_dev->dev->name);
162 	ax25_dev->sysheader = register_net_sysctl_sz(&init_net, path, table,
163 						     ARRAY_SIZE(ax25_param_table));
164 	if (!ax25_dev->sysheader) {
165 		kfree(table);
166 		return -ENOMEM;
167 	}
168 	return 0;
169 }
170 
ax25_unregister_dev_sysctl(ax25_dev * ax25_dev)171 void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev)
172 {
173 	struct ctl_table_header *header = ax25_dev->sysheader;
174 	struct ctl_table *table;
175 
176 	if (header) {
177 		ax25_dev->sysheader = NULL;
178 		table = header->ctl_table_arg;
179 		unregister_net_sysctl_table(header);
180 		kfree(table);
181 	}
182 }
183