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              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