net/ax25/sysctl_net_ax25.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  * Copyright (C) 1996 Mike Shaver (shaver@zeroknowledge.com)
   5  */
   6 #include <linux/mm.h>
   7 #include <linux/slab.h>
   8 #include <linux/sysctl.h>
   9 #include <linux/spinlock.h>
  10 #include <net/ax25.h>
  11
  12 static int min_ipdefmode[1],            max_ipdefmode[] = {1};
  13 static int min_axdefmode[1],            max_axdefmode[] = {1};
  14 static int min_backoff[1],              max_backoff[] = {2};
  15 static int min_conmode[1],              max_conmode[] = {2};
  16 static int min_window[] = {1},          max_window[] = {7};
  17 static int min_ewindow[] = {1},         max_ewindow[] = {63};
  18 static int min_t1[] = {1},              max_t1[] = {30000};
  19 static int min_t2[] = {1},              max_t2[] = {20000};
  20 static int min_t3[1],                   max_t3[] = {3600000};
  21 static int min_idle[1],                 max_idle[] = {65535000};
  22 static int min_n2[] = {1},              max_n2[] = {31};
  23 static int min_paclen[] = {1},          max_paclen[] = {512};
  24 static int min_proto[1],                max_proto[] = { AX25_PROTO_MAX };
  25 #ifdef CONFIG_AX25_DAMA_SLAVE
  26 static int min_ds_timeout[1],           max_ds_timeout[] = {65535000};
  27 #endif
  28
  29 static const struct ctl_table ax25_param_table[] = {
  30         {
  31                 .procname       = "ip_default_mode",
  32                 .maxlen         = sizeof(int),
  33                 .mode           = 0644,
  34                 .proc_handler   = proc_dointvec_minmax,
  35                 .extra1         = &min_ipdefmode,
  36                 .extra2         = &max_ipdefmode
  37         },
  38         {
  39                 .procname       = "ax25_default_mode",
  40                 .maxlen         = sizeof(int),
  41                 .mode           = 0644,
  42                 .proc_handler   = proc_dointvec_minmax,
  43                 .extra1         = &min_axdefmode,
  44                 .extra2         = &max_axdefmode
  45         },
  46         {
  47                 .procname       = "backoff_type",
  48                 .maxlen         = sizeof(int),
  49                 .mode           = 0644,
  50                 .proc_handler   = proc_dointvec_minmax,
  51                 .extra1         = &min_backoff,
  52                 .extra2         = &max_backoff
  53         },
  54         {
  55                 .procname       = "connect_mode",
  56                 .maxlen         = sizeof(int),
  57                 .mode           = 0644,
  58                 .proc_handler   = proc_dointvec_minmax,
  59                 .extra1         = &min_conmode,
  60                 .extra2         = &max_conmode
  61         },
  62         {
  63                 .procname       = "standard_window_size",
  64                 .maxlen         = sizeof(int),
  65                 .mode           = 0644,
  66                 .proc_handler   = proc_dointvec_minmax,
  67                 .extra1         = &min_window,
  68                 .extra2         = &max_window
  69         },
  70         {
  71                 .procname       = "extended_window_size",
  72                 .maxlen         = sizeof(int),
  73                 .mode           = 0644,
  74                 .proc_handler   = proc_dointvec_minmax,
  75                 .extra1         = &min_ewindow,
  76                 .extra2         = &max_ewindow
  77         },
  78         {
  79                 .procname       = "t1_timeout",
  80                 .maxlen         = sizeof(int),
  81                 .mode           = 0644,
  82                 .proc_handler   = proc_dointvec_minmax,
  83                 .extra1         = &min_t1,
  84                 .extra2         = &max_t1
  85         },
  86         {
  87                 .procname       = "t2_timeout",
  88                 .maxlen         = sizeof(int),
  89                 .mode           = 0644,
  90                 .proc_handler   = proc_dointvec_minmax,
  91                 .extra1         = &min_t2,
  92                 .extra2         = &max_t2
  93         },
  94         {
  95                 .procname       = "t3_timeout",
  96                 .maxlen         = sizeof(int),
  97                 .mode           = 0644,
  98                 .proc_handler   = proc_dointvec_minmax,
  99                 .extra1         = &min_t3,
 100                 .extra2         = &max_t3
 101         },
 102         {
 103                 .procname       = "idle_timeout",
 104                 .maxlen         = sizeof(int),
 105                 .mode           = 0644,
 106                 .proc_handler   = proc_dointvec_minmax,
 107                 .extra1         = &min_idle,
 108                 .extra2         = &max_idle
 109         },
 110         {
 111                 .procname       = "maximum_retry_count",
 112                 .maxlen         = sizeof(int),
 113                 .mode           = 0644,
 114                 .proc_handler   = proc_dointvec_minmax,
 115                 .extra1         = &min_n2,
 116                 .extra2         = &max_n2
 117         },
 118         {
 119                 .procname       = "maximum_packet_length",
 120                 .maxlen         = sizeof(int),
 121                 .mode           = 0644,
 122                 .proc_handler   = proc_dointvec_minmax,
 123                 .extra1         = &min_paclen,
 124                 .extra2         = &max_paclen
 125         },
 126         {
 127                 .procname       = "protocol",
 128                 .maxlen         = sizeof(int),
 129                 .mode           = 0644,
 130                 .proc_handler   = proc_dointvec_minmax,
 131                 .extra1         = &min_proto,
 132                 .extra2         = &max_proto
 133         },
 134 #ifdef CONFIG_AX25_DAMA_SLAVE
 135         {
 136                 .procname       = "dama_slave_timeout",
 137                 .maxlen         = sizeof(int),
 138                 .mode           = 0644,
 139                 .proc_handler   = proc_dointvec_minmax,
 140                 .extra1         = &min_ds_timeout,
 141                 .extra2         = &max_ds_timeout
 142         },
 143 #endif
 144
 145         { }     /* that's all, folks! */
 146 };
 147
 148 int ax25_register_dev_sysctl(ax25_dev *ax25_dev)
 149 {
 150         char path[sizeof("net/ax25/") + IFNAMSIZ];
 151         int k;
 152         struct ctl_table *table;
 153
 154         table = kmemdup(ax25_param_table, sizeof(ax25_param_table), GFP_KERNEL);
 155         if (!table)
 156                 return -ENOMEM;
 157
 158         for (k = 0; k < AX25_MAX_VALUES; k++)
 159                 table[k].data = &ax25_dev->values[k];
 160
 161         snprintf(path, sizeof(path), "net/ax25/%s", ax25_dev->dev->name);
 162         ax25_dev->sysheader = register_net_sysctl(&init_net, path, table);
 163         if (!ax25_dev->sysheader) {
 164                 kfree(table);
 165                 return -ENOMEM;
 166         }
 167         return 0;
 168 }
 169
 170 void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev)
 171 {
 172         struct ctl_table_header *header = ax25_dev->sysheader;
 173         struct ctl_table *table;
 174
 175         if (header) {
 176                 ax25_dev->sysheader = NULL;
 177                 table = header->ctl_table_arg;
 178                 unregister_net_sysctl_table(header);
 179                 kfree(table);
 180         }
 181 }