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 */
19static int		u8_max   = 0xFF;
20static unsigned long	seqw_min = DCCPF_SEQ_WMIN,
21			seqw_max = 0xFFFFFFFF;		/* maximum on 32 bit */
22
23static 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
97static struct ctl_table_header *dccp_table_header;
98
99int __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
107void 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