xref: /openbmc/linux/net/ax25/sysctl_net_ax25.c (revision 96de0e252cedffad61b3cb5e05662c591898e69a)
1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License as published by
4  * the Free Software Foundation; either version 2 of the License, or
5  * (at your option) any later version.
6  *
7  * Copyright (C) 1996 Mike Shaver (shaver@zeroknowledge.com)
8  */
9 #include <linux/mm.h>
10 #include <linux/sysctl.h>
11 #include <linux/spinlock.h>
12 #include <net/ax25.h>
13 
14 static int min_ipdefmode[1],    	max_ipdefmode[] = {1};
15 static int min_axdefmode[1],            max_axdefmode[] = {1};
16 static int min_backoff[1],		max_backoff[] = {2};
17 static int min_conmode[1],		max_conmode[] = {2};
18 static int min_window[] = {1},		max_window[] = {7};
19 static int min_ewindow[] = {1},		max_ewindow[] = {63};
20 static int min_t1[] = {1},		max_t1[] = {30000};
21 static int min_t2[] = {1},		max_t2[] = {20000};
22 static int min_t3[1],			max_t3[] = {3600000};
23 static int min_idle[1],			max_idle[] = {65535000};
24 static int min_n2[] = {1},		max_n2[] = {31};
25 static int min_paclen[] = {1},		max_paclen[] = {512};
26 static int min_proto[1],		max_proto[] = { AX25_PROTO_MAX };
27 static int min_ds_timeout[1],		max_ds_timeout[] = {65535000};
28 
29 static struct ctl_table_header *ax25_table_header;
30 
31 static ctl_table *ax25_table;
32 static int ax25_table_size;
33 
34 static ctl_table ax25_dir_table[] = {
35 	{
36 		.ctl_name	= NET_AX25,
37 		.procname	= "ax25",
38 		.mode		= 0555,
39 	},
40 	{ .ctl_name = 0 }
41 };
42 
43 static ctl_table ax25_root_table[] = {
44 	{
45 		.ctl_name	= CTL_NET,
46 		.procname	= "net",
47 		.mode		= 0555,
48 		.child		= ax25_dir_table
49 	},
50 	{ .ctl_name = 0 }
51 };
52 
53 static const ctl_table ax25_param_table[] = {
54 	{
55 		.ctl_name	= NET_AX25_IP_DEFAULT_MODE,
56 		.procname	= "ip_default_mode",
57 		.maxlen		= sizeof(int),
58 		.mode		= 0644,
59 		.proc_handler	= &proc_dointvec_minmax,
60 		.strategy	= &sysctl_intvec,
61 		.extra1		= &min_ipdefmode,
62 		.extra2		= &max_ipdefmode
63 	},
64 	{
65 		.ctl_name	= NET_AX25_DEFAULT_MODE,
66 		.procname	= "ax25_default_mode",
67 		.maxlen		= sizeof(int),
68 		.mode		= 0644,
69 		.proc_handler	= &proc_dointvec_minmax,
70 		.strategy	= &sysctl_intvec,
71 		.extra1		= &min_axdefmode,
72 		.extra2		= &max_axdefmode
73 	},
74 	{
75 		.ctl_name	= NET_AX25_BACKOFF_TYPE,
76 		.procname	= "backoff_type",
77 		.maxlen		= sizeof(int),
78 		.mode		= 0644,
79 		.proc_handler	= &proc_dointvec_minmax,
80 		.strategy	= &sysctl_intvec,
81 		.extra1		= &min_backoff,
82 		.extra2		= &max_backoff
83 	},
84 	{
85 		.ctl_name	= NET_AX25_CONNECT_MODE,
86 		.procname	= "connect_mode",
87 		.maxlen		= sizeof(int),
88 		.mode		= 0644,
89 		.proc_handler	= &proc_dointvec_minmax,
90 		.strategy	= &sysctl_intvec,
91 		.extra1		= &min_conmode,
92 		.extra2		= &max_conmode
93 	},
94 	{
95 		.ctl_name	= NET_AX25_STANDARD_WINDOW,
96 		.procname	= "standard_window_size",
97 		.maxlen		= sizeof(int),
98 		.mode		= 0644,
99 		.proc_handler	= &proc_dointvec_minmax,
100 		.strategy	= &sysctl_intvec,
101 		.extra1		= &min_window,
102 		.extra2		= &max_window
103 	},
104 	{
105 		.ctl_name	= NET_AX25_EXTENDED_WINDOW,
106 		.procname	= "extended_window_size",
107 		.maxlen		= sizeof(int),
108 		.mode		= 0644,
109 		.proc_handler	= &proc_dointvec_minmax,
110 		.strategy	= &sysctl_intvec,
111 		.extra1		= &min_ewindow,
112 		.extra2		= &max_ewindow
113 	},
114 	{
115 		.ctl_name	= NET_AX25_T1_TIMEOUT,
116 		.procname	= "t1_timeout",
117 		.maxlen		= sizeof(int),
118 		.mode		= 0644,
119 		.proc_handler	= &proc_dointvec_minmax,
120 		.strategy	= &sysctl_intvec,
121 		.extra1		= &min_t1,
122 		.extra2		= &max_t1
123 	},
124 	{
125 		.ctl_name	= NET_AX25_T2_TIMEOUT,
126 		.procname	= "t2_timeout",
127 		.maxlen		= sizeof(int),
128 		.mode		= 0644,
129 		.proc_handler	= &proc_dointvec_minmax,
130 		.strategy	= &sysctl_intvec,
131 		.extra1		= &min_t2,
132 		.extra2		= &max_t2
133 	},
134 	{
135 		.ctl_name	= NET_AX25_T3_TIMEOUT,
136 		.procname	= "t3_timeout",
137 		.maxlen		= sizeof(int),
138 		.mode		= 0644,
139 		.proc_handler	= &proc_dointvec_minmax,
140 		.strategy	= &sysctl_intvec,
141 		.extra1		= &min_t3,
142 		.extra2		= &max_t3
143 	},
144 	{
145 		.ctl_name	= NET_AX25_IDLE_TIMEOUT,
146 		.procname	= "idle_timeout",
147 		.maxlen		= sizeof(int),
148 		.mode		= 0644,
149 		.proc_handler	= &proc_dointvec_minmax,
150 		.strategy	= &sysctl_intvec,
151 		.extra1		= &min_idle,
152 		.extra2		= &max_idle
153 	},
154 	{
155 		.ctl_name	= NET_AX25_N2,
156 		.procname	= "maximum_retry_count",
157 		.maxlen		= sizeof(int),
158 		.mode		= 0644,
159 		.proc_handler	= &proc_dointvec_minmax,
160 		.strategy	= &sysctl_intvec,
161 		.extra1		= &min_n2,
162 		.extra2		= &max_n2
163 	},
164 	{
165 		.ctl_name	= NET_AX25_PACLEN,
166 		.procname	= "maximum_packet_length",
167 		.maxlen		= sizeof(int),
168 		.mode		= 0644,
169 		.proc_handler	= &proc_dointvec_minmax,
170 		.strategy	= &sysctl_intvec,
171 		.extra1		= &min_paclen,
172 		.extra2		= &max_paclen
173 	},
174 	{
175 		.ctl_name	= NET_AX25_PROTOCOL,
176 		.procname	= "protocol",
177 		.maxlen		= sizeof(int),
178 		.mode		= 0644,
179 		.proc_handler	= &proc_dointvec_minmax,
180 		.strategy	= &sysctl_intvec,
181 		.extra1		= &min_proto,
182 		.extra2		= &max_proto
183 	},
184 	{
185 		.ctl_name	= NET_AX25_DAMA_SLAVE_TIMEOUT,
186 		.procname	= "dama_slave_timeout",
187 		.maxlen		= sizeof(int),
188 		.mode		= 0644,
189 		.proc_handler	= &proc_dointvec_minmax,
190 		.strategy	= &sysctl_intvec,
191 		.extra1		= &min_ds_timeout,
192 		.extra2		= &max_ds_timeout
193 	},
194 	{ .ctl_name = 0 }	/* that's all, folks! */
195 };
196 
197 void ax25_register_sysctl(void)
198 {
199 	ax25_dev *ax25_dev;
200 	int n, k;
201 
202 	spin_lock_bh(&ax25_dev_lock);
203 	for (ax25_table_size = sizeof(ctl_table), ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
204 		ax25_table_size += sizeof(ctl_table);
205 
206 	if ((ax25_table = kzalloc(ax25_table_size, GFP_ATOMIC)) == NULL) {
207 		spin_unlock_bh(&ax25_dev_lock);
208 		return;
209 	}
210 
211 	for (n = 0, ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next) {
212 		struct ctl_table *child = kmemdup(ax25_param_table,
213 						  sizeof(ax25_param_table),
214 						  GFP_ATOMIC);
215 		if (!child) {
216 			while (n--)
217 				kfree(ax25_table[n].child);
218 			kfree(ax25_table);
219 			spin_unlock_bh(&ax25_dev_lock);
220 			return;
221 		}
222 		ax25_table[n].child = ax25_dev->systable = child;
223 		ax25_table[n].ctl_name     = n + 1;
224 		ax25_table[n].procname     = ax25_dev->dev->name;
225 		ax25_table[n].mode         = 0555;
226 
227 #ifndef CONFIG_AX25_DAMA_SLAVE
228 		/*
229 		 * We do not wish to have a representation of this parameter
230 		 * in /proc/sys/ when configured *not* to include the
231 		 * AX.25 DAMA slave code, do we?
232 		 */
233 
234 		child[AX25_VALUES_DS_TIMEOUT].procname = NULL;
235 #endif
236 
237 		child[AX25_MAX_VALUES].ctl_name = 0;	/* just in case... */
238 
239 		for (k = 0; k < AX25_MAX_VALUES; k++)
240 			child[k].data = &ax25_dev->values[k];
241 
242 		n++;
243 	}
244 	spin_unlock_bh(&ax25_dev_lock);
245 
246 	ax25_dir_table[0].child = ax25_table;
247 
248 	ax25_table_header = register_sysctl_table(ax25_root_table);
249 }
250 
251 void ax25_unregister_sysctl(void)
252 {
253 	ctl_table *p;
254 	unregister_sysctl_table(ax25_table_header);
255 
256 	ax25_dir_table[0].child = NULL;
257 	for (p = ax25_table; p->ctl_name; p++)
258 		kfree(p->child);
259 	kfree(ax25_table);
260 }
261