This source file includes following definitions.
- set_local_port_range
- phonet_get_local_port_range
- proc_local_port_range
- phonet_sysctl_init
- phonet_sysctl_exit
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12 #include <linux/seqlock.h>
13 #include <linux/sysctl.h>
14 #include <linux/errno.h>
15 #include <linux/init.h>
16
17 #include <net/sock.h>
18 #include <linux/phonet.h>
19 #include <net/phonet/phonet.h>
20
21 #define DYNAMIC_PORT_MIN 0x40
22 #define DYNAMIC_PORT_MAX 0x7f
23
24 static DEFINE_SEQLOCK(local_port_range_lock);
25 static int local_port_range_min[2] = {0, 0};
26 static int local_port_range_max[2] = {1023, 1023};
27 static int local_port_range[2] = {DYNAMIC_PORT_MIN, DYNAMIC_PORT_MAX};
28 static struct ctl_table_header *phonet_table_hrd;
29
30 static void set_local_port_range(int range[2])
31 {
32 write_seqlock(&local_port_range_lock);
33 local_port_range[0] = range[0];
34 local_port_range[1] = range[1];
35 write_sequnlock(&local_port_range_lock);
36 }
37
38 void phonet_get_local_port_range(int *min, int *max)
39 {
40 unsigned int seq;
41
42 do {
43 seq = read_seqbegin(&local_port_range_lock);
44 if (min)
45 *min = local_port_range[0];
46 if (max)
47 *max = local_port_range[1];
48 } while (read_seqretry(&local_port_range_lock, seq));
49 }
50
51 static int proc_local_port_range(struct ctl_table *table, int write,
52 void __user *buffer,
53 size_t *lenp, loff_t *ppos)
54 {
55 int ret;
56 int range[2] = {local_port_range[0], local_port_range[1]};
57 struct ctl_table tmp = {
58 .data = &range,
59 .maxlen = sizeof(range),
60 .mode = table->mode,
61 .extra1 = &local_port_range_min,
62 .extra2 = &local_port_range_max,
63 };
64
65 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
66
67 if (write && ret == 0) {
68 if (range[1] < range[0])
69 ret = -EINVAL;
70 else
71 set_local_port_range(range);
72 }
73
74 return ret;
75 }
76
77 static struct ctl_table phonet_table[] = {
78 {
79 .procname = "local_port_range",
80 .data = &local_port_range,
81 .maxlen = sizeof(local_port_range),
82 .mode = 0644,
83 .proc_handler = proc_local_port_range,
84 },
85 { }
86 };
87
88 int __init phonet_sysctl_init(void)
89 {
90 phonet_table_hrd = register_net_sysctl(&init_net, "net/phonet", phonet_table);
91 return phonet_table_hrd == NULL ? -ENOMEM : 0;
92 }
93
94 void phonet_sysctl_exit(void)
95 {
96 unregister_net_sysctl_table(phonet_table_hrd);
97 }