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 */
  19 static int              zero     = 0,
  20                         one      = 1,
  21                         u8_max   = 0xFF;
  22 static unsigned long    seqw_min = DCCPF_SEQ_WMIN,
  23                         seqw_max = 0xFFFFFFFF;          /* maximum on 32 bit */
  24
  25 static 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
  99 static struct ctl_table_header *dccp_table_header;
 100
 101 int __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
 109 void 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 }