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1 | /* |
2 | * File: sysctl.c |
3 | * |
4 | * Phonet /proc/sys/net/phonet interface implementation |
5 | * |
6 | * Copyright (C) 2008 Nokia Corporation. |
7 | * |
8 | * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com> |
9 | * |
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. |
13 | * |
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. |
18 | * |
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 |
22 | * 02110-1301 USA |
23 | */ |
24 | |
25 | #include <linux/seqlock.h> |
26 | #include <linux/sysctl.h> |
27 | #include <linux/errno.h> |
28 | #include <linux/init.h> |
29 | |
30 | #define DYNAMIC_PORT_MIN 0x40 |
31 | #define DYNAMIC_PORT_MAX 0x7f |
32 | |
33 | static DEFINE_SEQLOCK(local_port_range_lock); |
34 | static int local_port_range_min[2] = {0, 0}; |
35 | static int local_port_range_max[2] = {1023, 1023}; |
36 | static int local_port_range[2] = {DYNAMIC_PORT_MIN, DYNAMIC_PORT_MAX}; |
37 | static struct ctl_table_header *phonet_table_hrd; |
38 | |
39 | static void set_local_port_range(int range[2]) |
40 | { |
41 | write_seqlock(&local_port_range_lock); |
42 | local_port_range[0] = range[0]; |
43 | local_port_range[1] = range[1]; |
44 | write_sequnlock(&local_port_range_lock); |
45 | } |
46 | |
47 | void phonet_get_local_port_range(int *min, int *max) |
48 | { |
49 | unsigned seq; |
50 | do { |
51 | seq = read_seqbegin(&local_port_range_lock); |
52 | if (min) |
53 | *min = local_port_range[0]; |
54 | if (max) |
55 | *max = local_port_range[1]; |
56 | } while (read_seqretry(&local_port_range_lock, seq)); |
57 | } |
58 | |
59 | static int proc_local_port_range(ctl_table *table, int write, |
60 | void __user *buffer, |
61 | size_t *lenp, loff_t *ppos) |
62 | { |
63 | int ret; |
64 | int range[2] = {local_port_range[0], local_port_range[1]}; |
65 | ctl_table tmp = { |
66 | .data = &range, |
67 | .maxlen = sizeof(range), |
68 | .mode = table->mode, |
69 | .extra1 = &local_port_range_min, |
70 | .extra2 = &local_port_range_max, |
71 | }; |
72 | |
73 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
74 | |
75 | if (write && ret == 0) { |
76 | if (range[1] < range[0]) |
77 | ret = -EINVAL; |
78 | else |
79 | set_local_port_range(range); |
80 | } |
81 | |
82 | return ret; |
83 | } |
84 | |
85 | static struct ctl_table phonet_table[] = { |
86 | { |
87 | .ctl_name = CTL_UNNUMBERED, |
88 | .procname = "local_port_range", |
89 | .data = &local_port_range, |
90 | .maxlen = sizeof(local_port_range), |
91 | .mode = 0644, |
92 | .proc_handler = proc_local_port_range, |
93 | .strategy = NULL, |
94 | }, |
95 | { .ctl_name = 0 } |
96 | }; |
97 | |
98 | static struct ctl_path phonet_ctl_path[] = { |
99 | { .procname = "net", .ctl_name = CTL_NET, }, |
100 | { .procname = "phonet", .ctl_name = CTL_UNNUMBERED, }, |
101 | { }, |
102 | }; |
103 | |
104 | int __init phonet_sysctl_init(void) |
105 | { |
106 | phonet_table_hrd = register_sysctl_paths(phonet_ctl_path, phonet_table); |
107 | return phonet_table_hrd == NULL ? -ENOMEM : 0; |
108 | } |
109 | |
110 | void phonet_sysctl_exit(void) |
111 | { |
112 | unregister_sysctl_table(phonet_table_hrd); |
113 | } |
114 |
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