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              u8_max   = 0xFF;
  20 static unsigned long    seqw_min = DCCPF_SEQ_WMIN,
  21                         seqw_max = 0xFFFFFFFF;          /* maximum on 32 bit */
  22
  23 static 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
  97 static struct ctl_table_header *dccp_table_header;
  98
  99 int __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
 107 void 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 }