1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * net/dccp/sysctl.c
4 *
5 * An implementation of the DCCP protocol
6 * Arnaldo Carvalho de Melo <acme@mandriva.com>
7 */
8
9 #include <linux/mm.h>
10 #include <linux/sysctl.h>
11 #include "dccp.h"
12 #include "feat.h"
13
14 #ifndef CONFIG_SYSCTL
15 #error This file should not be compiled without CONFIG_SYSCTL defined
16 #endif
17
18 /* Boundary values */
19 static int u8_max = 0xFF;
20 static unsigned long seqw_min = DCCPF_SEQ_WMIN,
21 seqw_max = 0xFFFFFFFF; /* maximum on 32 bit */
22
23 static struct ctl_table dccp_default_table[] = {
24 {
25 .procname = "seq_window",
26 .data = &sysctl_dccp_sequence_window,
27 .maxlen = sizeof(sysctl_dccp_sequence_window),
28 .mode = 0644,
29 .proc_handler = proc_doulongvec_minmax,
30 .extra1 = &seqw_min, /* RFC 4340, 7.5.2 */
31 .extra2 = &seqw_max,
32 },
33 {
34 .procname = "rx_ccid",
35 .data = &sysctl_dccp_rx_ccid,
36 .maxlen = sizeof(sysctl_dccp_rx_ccid),
37 .mode = 0644,
38 .proc_handler = proc_dointvec_minmax,
39 .extra1 = SYSCTL_ZERO,
40 .extra2 = &u8_max, /* RFC 4340, 10. */
41 },
42 {
43 .procname = "tx_ccid",
44 .data = &sysctl_dccp_tx_ccid,
45 .maxlen = sizeof(sysctl_dccp_tx_ccid),
46 .mode = 0644,
47 .proc_handler = proc_dointvec_minmax,
48 .extra1 = SYSCTL_ZERO,
49 .extra2 = &u8_max, /* RFC 4340, 10. */
50 },
51 {
52 .procname = "request_retries",
53 .data = &sysctl_dccp_request_retries,
54 .maxlen = sizeof(sysctl_dccp_request_retries),
55 .mode = 0644,
56 .proc_handler = proc_dointvec_minmax,
57 .extra1 = SYSCTL_ONE,
58 .extra2 = &u8_max,
59 },
60 {
61 .procname = "retries1",
62 .data = &sysctl_dccp_retries1,
63 .maxlen = sizeof(sysctl_dccp_retries1),
64 .mode = 0644,
65 .proc_handler = proc_dointvec_minmax,
66 .extra1 = SYSCTL_ZERO,
67 .extra2 = &u8_max,
68 },
69 {
70 .procname = "retries2",
71 .data = &sysctl_dccp_retries2,
72 .maxlen = sizeof(sysctl_dccp_retries2),
73 .mode = 0644,
74 .proc_handler = proc_dointvec_minmax,
75 .extra1 = SYSCTL_ZERO,
76 .extra2 = &u8_max,
77 },
78 {
79 .procname = "tx_qlen",
80 .data = &sysctl_dccp_tx_qlen,
81 .maxlen = sizeof(sysctl_dccp_tx_qlen),
82 .mode = 0644,
83 .proc_handler = proc_dointvec_minmax,
84 .extra1 = SYSCTL_ZERO,
85 },
86 {
87 .procname = "sync_ratelimit",
88 .data = &sysctl_dccp_sync_ratelimit,
89 .maxlen = sizeof(sysctl_dccp_sync_ratelimit),
90 .mode = 0644,
91 .proc_handler = proc_dointvec_ms_jiffies,
92 },
93
94 { }
95 };
96
97 static struct ctl_table_header *dccp_table_header;
98
dccp_sysctl_init(void)99 int __init dccp_sysctl_init(void)
100 {
101 dccp_table_header = register_net_sysctl(&init_net, "net/dccp/default",
102 dccp_default_table);
103
104 return dccp_table_header != NULL ? 0 : -ENOMEM;
105 }
106
dccp_sysctl_exit(void)107 void dccp_sysctl_exit(void)
108 {
109 if (dccp_table_header != NULL) {
110 unregister_net_sysctl_table(dccp_table_header);
111 dccp_table_header = NULL;
112 }
113 }
114