net/dccp/sysctl.c

   1 /*
   2  *  net/dccp/sysctl.c
   3  *
   4  *  An implementation of the DCCP protocol
   5  *  Arnaldo Carvalho de Melo <acme@mandriva.com>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License v2
   9  *      as published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/mm.h>
  13 #include <linux/sysctl.h>
  14 #include "dccp.h"
  15 #include "feat.h"
  16
  17 #ifndef CONFIG_SYSCTL
  18 #error This file should not be compiled without CONFIG_SYSCTL defined
  19 #endif
  20
  21 /* Boundary values */
  22 static int              zero     = 0,
  23                         one      = 1,
  24                         u8_max   = 0xFF;
  25 static unsigned long    seqw_min = DCCPF_SEQ_WMIN,
  26                         seqw_max = 0xFFFFFFFF;          /* maximum on 32 bit */
  27
  28 static struct ctl_table dccp_default_table[] = {
  29         {
  30                 .procname       = "seq_window",
  31                 .data           = &sysctl_dccp_sequence_window,
  32                 .maxlen         = sizeof(sysctl_dccp_sequence_window),
  33                 .mode           = 0644,
  34                 .proc_handler   = proc_doulongvec_minmax,
  35                 .extra1         = &seqw_min,            /* RFC 4340, 7.5.2 */
  36                 .extra2         = &seqw_max,
  37         },
  38         {
  39                 .procname       = "rx_ccid",
  40                 .data           = &sysctl_dccp_rx_ccid,
  41                 .maxlen         = sizeof(sysctl_dccp_rx_ccid),
  42                 .mode           = 0644,
  43                 .proc_handler   = proc_dointvec_minmax,
  44                 .extra1         = &zero,
  45                 .extra2         = &u8_max,              /* RFC 4340, 10. */
  46         },
  47         {
  48                 .procname       = "tx_ccid",
  49                 .data           = &sysctl_dccp_tx_ccid,
  50                 .maxlen         = sizeof(sysctl_dccp_tx_ccid),
  51                 .mode           = 0644,
  52                 .proc_handler   = proc_dointvec_minmax,
  53                 .extra1         = &zero,
  54                 .extra2         = &u8_max,              /* RFC 4340, 10. */
  55         },
  56         {
  57                 .procname       = "request_retries",
  58                 .data           = &sysctl_dccp_request_retries,
  59                 .maxlen         = sizeof(sysctl_dccp_request_retries),
  60                 .mode           = 0644,
  61                 .proc_handler   = proc_dointvec_minmax,
  62                 .extra1         = &one,
  63                 .extra2         = &u8_max,
  64         },
  65         {
  66                 .procname       = "retries1",
  67                 .data           = &sysctl_dccp_retries1,
  68                 .maxlen         = sizeof(sysctl_dccp_retries1),
  69                 .mode           = 0644,
  70                 .proc_handler   = proc_dointvec_minmax,
  71                 .extra1         = &zero,
  72                 .extra2         = &u8_max,
  73         },
  74         {
  75                 .procname       = "retries2",
  76                 .data           = &sysctl_dccp_retries2,
  77                 .maxlen         = sizeof(sysctl_dccp_retries2),
  78                 .mode           = 0644,
  79                 .proc_handler   = proc_dointvec_minmax,
  80                 .extra1         = &zero,
  81                 .extra2         = &u8_max,
  82         },
  83         {
  84                 .procname       = "tx_qlen",
  85                 .data           = &sysctl_dccp_tx_qlen,
  86                 .maxlen         = sizeof(sysctl_dccp_tx_qlen),
  87                 .mode           = 0644,
  88                 .proc_handler   = proc_dointvec_minmax,
  89                 .extra1         = &zero,
  90         },
  91         {
  92                 .procname       = "sync_ratelimit",
  93                 .data           = &sysctl_dccp_sync_ratelimit,
  94                 .maxlen         = sizeof(sysctl_dccp_sync_ratelimit),
  95                 .mode           = 0644,
  96                 .proc_handler   = proc_dointvec_ms_jiffies,
  97         },
  98
  99         { }
 100 };
 101
 102 static struct ctl_table_header *dccp_table_header;
 103
 104 int __init dccp_sysctl_init(void)
 105 {
 106         dccp_table_header = register_net_sysctl(&init_net, "net/dccp/default",
 107                         dccp_default_table);
 108
 109         return dccp_table_header != NULL ? 0 : -ENOMEM;
 110 }
 111
 112 void dccp_sysctl_exit(void)
 113 {
 114         if (dccp_table_header != NULL) {
 115                 unregister_net_sysctl_table(dccp_table_header);
 116                 dccp_table_header = NULL;
 117         }
 118 }