LXR linux/net/dccp/sysctl.c

   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              zero     = 0,
  20                        one      = 1,
  21                        u8_max   = 0xFF;
  22static unsigned long    seqw_min = DCCPF_SEQ_WMIN,
  23                        seqw_max = 0xFFFFFFFF;          /* maximum on 32 bit */
  24
  25static struct ctl_table dccp_default_table[] = {
  26        {
  27                .procname       = "seq_window",
  28                .data           = &sysctl_dccp_sequence_window,
  29                .maxlen         = sizeof(sysctl_dccp_sequence_window),
  30                .mode           = 0644,
  31                .proc_handler   = proc_doulongvec_minmax,
  32                .extra1         = &seqw_min,            /* RFC 4340, 7.5.2 */
  33                .extra2         = &seqw_max,
  34        },
  35        {
  36                .procname       = "rx_ccid",
  37                .data           = &sysctl_dccp_rx_ccid,
  38                .maxlen         = sizeof(sysctl_dccp_rx_ccid),
  39                .mode           = 0644,
  40                .proc_handler   = proc_dointvec_minmax,
  41                .extra1         = &zero,
  42                .extra2         = &u8_max,              /* RFC 4340, 10. */
  43        },
  44        {
  45                .procname       = "tx_ccid",
  46                .data           = &sysctl_dccp_tx_ccid,
  47                .maxlen         = sizeof(sysctl_dccp_tx_ccid),
  48                .mode           = 0644,
  49                .proc_handler   = proc_dointvec_minmax,
  50                .extra1         = &zero,
  51                .extra2         = &u8_max,              /* RFC 4340, 10. */
  52        },
  53        {
  54                .procname       = "request_retries",
  55                .data           = &sysctl_dccp_request_retries,
  56                .maxlen         = sizeof(sysctl_dccp_request_retries),
  57                .mode           = 0644,
  58                .proc_handler   = proc_dointvec_minmax,
  59                .extra1         = &one,
  60                .extra2         = &u8_max,
  61        },
  62        {
  63                .procname       = "retries1",
  64                .data           = &sysctl_dccp_retries1,
  65                .maxlen         = sizeof(sysctl_dccp_retries1),
  66                .mode           = 0644,
  67                .proc_handler   = proc_dointvec_minmax,
  68                .extra1         = &zero,
  69                .extra2         = &u8_max,
  70        },
  71        {
  72                .procname       = "retries2",
  73                .data           = &sysctl_dccp_retries2,
  74                .maxlen         = sizeof(sysctl_dccp_retries2),
  75                .mode           = 0644,
  76                .proc_handler   = proc_dointvec_minmax,
  77                .extra1         = &zero,
  78                .extra2         = &u8_max,
  79        },
  80        {
  81                .procname       = "tx_qlen",
  82                .data           = &sysctl_dccp_tx_qlen,
  83                .maxlen         = sizeof(sysctl_dccp_tx_qlen),
  84                .mode           = 0644,
  85                .proc_handler   = proc_dointvec_minmax,
  86                .extra1         = &zero,
  87        },
  88        {
  89                .procname       = "sync_ratelimit",
  90                .data           = &sysctl_dccp_sync_ratelimit,
  91                .maxlen         = sizeof(sysctl_dccp_sync_ratelimit),
  92                .mode           = 0644,
  93                .proc_handler   = proc_dointvec_ms_jiffies,
  94        },
  95
  96        { }
  97};
  98
  99static struct ctl_table_header *dccp_table_header;
 100
 101int __init dccp_sysctl_init(void)
 102{
 103        dccp_table_header = register_net_sysctl(&init_net, "net/dccp/default",
 104                        dccp_default_table);
 105
 106        return dccp_table_header != NULL ? 0 : -ENOMEM;
 107}
 108
 109void dccp_sysctl_exit(void)
 110{
 111        if (dccp_table_header != NULL) {
 112                unregister_net_sysctl_table(dccp_table_header);
 113                dccp_table_header = NULL;
 114        }
 115}
 116