4 * Phonet /proc/sys/net/phonet interface implementation
6 * Copyright (C) 2008 Nokia Corporation.
8 * Author: RĂ©mi Denis-Courmont
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * version 2 as published by the Free Software Foundation.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
25 #include <linux/seqlock.h>
26 #include <linux/sysctl.h>
27 #include <linux/errno.h>
28 #include <linux/init.h>
31 #include <linux/phonet.h>
32 #include <net/phonet/phonet.h>
34 #define DYNAMIC_PORT_MIN 0x40
35 #define DYNAMIC_PORT_MAX 0x7f
37 static DEFINE_SEQLOCK(local_port_range_lock
);
38 static int local_port_range_min
[2] = {0, 0};
39 static int local_port_range_max
[2] = {1023, 1023};
40 static int local_port_range
[2] = {DYNAMIC_PORT_MIN
, DYNAMIC_PORT_MAX
};
41 static struct ctl_table_header
*phonet_table_hrd
;
43 static void set_local_port_range(int range
[2])
45 write_seqlock(&local_port_range_lock
);
46 local_port_range
[0] = range
[0];
47 local_port_range
[1] = range
[1];
48 write_sequnlock(&local_port_range_lock
);
51 void phonet_get_local_port_range(int *min
, int *max
)
56 seq
= read_seqbegin(&local_port_range_lock
);
58 *min
= local_port_range
[0];
60 *max
= local_port_range
[1];
61 } while (read_seqretry(&local_port_range_lock
, seq
));
64 static int proc_local_port_range(struct ctl_table
*table
, int write
,
66 size_t *lenp
, loff_t
*ppos
)
69 int range
[2] = {local_port_range
[0], local_port_range
[1]};
70 struct ctl_table tmp
= {
72 .maxlen
= sizeof(range
),
74 .extra1
= &local_port_range_min
,
75 .extra2
= &local_port_range_max
,
78 ret
= proc_dointvec_minmax(&tmp
, write
, buffer
, lenp
, ppos
);
80 if (write
&& ret
== 0) {
81 if (range
[1] < range
[0])
84 set_local_port_range(range
);
90 static struct ctl_table phonet_table
[] = {
92 .procname
= "local_port_range",
93 .data
= &local_port_range
,
94 .maxlen
= sizeof(local_port_range
),
96 .proc_handler
= proc_local_port_range
,
101 int __init
phonet_sysctl_init(void)
103 phonet_table_hrd
= register_net_sysctl(&init_net
, "net/phonet", phonet_table
);
104 return phonet_table_hrd
== NULL
? -ENOMEM
: 0;
107 void phonet_sysctl_exit(void)
109 unregister_net_sysctl_table(phonet_table_hrd
);
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