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                         u8_max   = 0xFF;
  24 static unsigned long    seqw_min = DCCPF_SEQ_WMIN,
  25                         seqw_max = 0xFFFFFFFF;          /* maximum on 32 bit */
  26
  27 static struct ctl_table dccp_default_table[] = {
  28         {
  29                 .procname       = "seq_window",
  30                 .data           = &sysctl_dccp_sequence_window,
  31                 .maxlen         = sizeof(sysctl_dccp_sequence_window),
  32                 .mode           = 0644,
  33                 .proc_handler   = proc_doulongvec_minmax,
  34                 .extra1         = &seqw_min,            /* RFC 4340, 7.5.2 */
  35                 .extra2         = &seqw_max,
  36         },
  37         {
  38                 .procname       = "rx_ccid",
  39                 .data           = &sysctl_dccp_rx_ccid,
  40                 .maxlen         = sizeof(sysctl_dccp_rx_ccid),
  41                 .mode           = 0644,
  42                 .proc_handler   = proc_dointvec_minmax,
  43                 .extra1         = &zero,
  44                 .extra2         = &u8_max,              /* RFC 4340, 10. */
  45         },
  46         {
  47                 .procname       = "tx_ccid",
  48                 .data           = &sysctl_dccp_tx_ccid,
  49                 .maxlen         = sizeof(sysctl_dccp_tx_ccid),
  50                 .mode           = 0644,
  51                 .proc_handler   = proc_dointvec_minmax,
  52                 .extra1         = &zero,
  53                 .extra2         = &u8_max,              /* RFC 4340, 10. */
  54         },
  55         {
  56                 .procname       = "request_retries",
  57                 .data           = &sysctl_dccp_request_retries,
  58                 .maxlen         = sizeof(sysctl_dccp_request_retries),
  59                 .mode           = 0644,
  60                 .proc_handler   = proc_dointvec_minmax,
  61                 .extra1         = &zero,
  62                 .extra2         = &u8_max,
  63         },
  64         {
  65                 .procname       = "retries1",
  66                 .data           = &sysctl_dccp_retries1,
  67                 .maxlen         = sizeof(sysctl_dccp_retries1),
  68                 .mode           = 0644,
  69                 .proc_handler   = proc_dointvec_minmax,
  70                 .extra1         = &zero,
  71                 .extra2         = &u8_max,
  72         },
  73         {
  74                 .procname       = "retries2",
  75                 .data           = &sysctl_dccp_retries2,
  76                 .maxlen         = sizeof(sysctl_dccp_retries2),
  77                 .mode           = 0644,
  78                 .proc_handler   = proc_dointvec_minmax,
  79                 .extra1         = &zero,
  80                 .extra2         = &u8_max,
  81         },
  82         {
  83                 .procname       = "tx_qlen",
  84                 .data           = &sysctl_dccp_tx_qlen,
  85                 .maxlen         = sizeof(sysctl_dccp_tx_qlen),
  86                 .mode           = 0644,
  87                 .proc_handler   = proc_dointvec_minmax,
  88                 .extra1         = &zero,
  89         },
  90         {
  91                 .procname       = "sync_ratelimit",
  92                 .data           = &sysctl_dccp_sync_ratelimit,
  93                 .maxlen         = sizeof(sysctl_dccp_sync_ratelimit),
  94                 .mode           = 0644,
  95                 .proc_handler   = proc_dointvec_ms_jiffies,
  96         },
  97
  98         { }
  99 };
 100
 101 static struct ctl_path dccp_path[] = {
 102         { .procname = "net", },
 103         { .procname = "dccp", },
 104         { .procname = "default", },
 105         { }
 106 };
 107
 108 static struct ctl_table_header *dccp_table_header;
 109
 110 int __init dccp_sysctl_init(void)
 111 {
 112         dccp_table_header = register_sysctl_paths(dccp_path,
 113                         dccp_default_table);
 114
 115         return dccp_table_header != NULL ? 0 : -ENOMEM;
 116 }
 117
 118 void dccp_sysctl_exit(void)
 119 {
 120         if (dccp_table_header != NULL) {
 121                 unregister_sysctl_table(dccp_table_header);
 122                 dccp_table_header = NULL;
 123         }
 124 }