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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/* Boundary values */
15static int u8_max = 0xFF;
16static unsigned long seqw_min = DCCPF_SEQ_WMIN,
17 seqw_max = 0xFFFFFFFF; /* maximum on 32 bit */
18
19static struct ctl_table dccp_default_table[] = {
20 {
21 .procname = "seq_window",
22 .data = &sysctl_dccp_sequence_window,
23 .maxlen = sizeof(sysctl_dccp_sequence_window),
24 .mode = 0644,
25 .proc_handler = proc_doulongvec_minmax,
26 .extra1 = &seqw_min, /* RFC 4340, 7.5.2 */
27 .extra2 = &seqw_max,
28 },
29 {
30 .procname = "rx_ccid",
31 .data = &sysctl_dccp_rx_ccid,
32 .maxlen = sizeof(sysctl_dccp_rx_ccid),
33 .mode = 0644,
34 .proc_handler = proc_dointvec_minmax,
35 .extra1 = SYSCTL_ZERO,
36 .extra2 = &u8_max, /* RFC 4340, 10. */
37 },
38 {
39 .procname = "tx_ccid",
40 .data = &sysctl_dccp_tx_ccid,
41 .maxlen = sizeof(sysctl_dccp_tx_ccid),
42 .mode = 0644,
43 .proc_handler = proc_dointvec_minmax,
44 .extra1 = SYSCTL_ZERO,
45 .extra2 = &u8_max, /* RFC 4340, 10. */
46 },
47 {
48 .procname = "request_retries",
49 .data = &sysctl_dccp_request_retries,
50 .maxlen = sizeof(sysctl_dccp_request_retries),
51 .mode = 0644,
52 .proc_handler = proc_dointvec_minmax,
53 .extra1 = SYSCTL_ONE,
54 .extra2 = &u8_max,
55 },
56 {
57 .procname = "retries1",
58 .data = &sysctl_dccp_retries1,
59 .maxlen = sizeof(sysctl_dccp_retries1),
60 .mode = 0644,
61 .proc_handler = proc_dointvec_minmax,
62 .extra1 = SYSCTL_ZERO,
63 .extra2 = &u8_max,
64 },
65 {
66 .procname = "retries2",
67 .data = &sysctl_dccp_retries2,
68 .maxlen = sizeof(sysctl_dccp_retries2),
69 .mode = 0644,
70 .proc_handler = proc_dointvec_minmax,
71 .extra1 = SYSCTL_ZERO,
72 .extra2 = &u8_max,
73 },
74 {
75 .procname = "tx_qlen",
76 .data = &sysctl_dccp_tx_qlen,
77 .maxlen = sizeof(sysctl_dccp_tx_qlen),
78 .mode = 0644,
79 .proc_handler = proc_dointvec_minmax,
80 .extra1 = SYSCTL_ZERO,
81 },
82 {
83 .procname = "sync_ratelimit",
84 .data = &sysctl_dccp_sync_ratelimit,
85 .maxlen = sizeof(sysctl_dccp_sync_ratelimit),
86 .mode = 0644,
87 .proc_handler = proc_dointvec_ms_jiffies,
88 },
89};
90
91static struct ctl_table_header *dccp_table_header;
92
93int __init dccp_sysctl_init(void)
94{
95 dccp_table_header = register_net_sysctl(&init_net, "net/dccp/default",
96 dccp_default_table);
97
98 return dccp_table_header != NULL ? 0 : -ENOMEM;
99}
100
101void dccp_sysctl_exit(void)
102{
103 if (dccp_table_header != NULL) {
104 unregister_net_sysctl_table(dccp_table_header);
105 dccp_table_header = NULL;
106 }
107}