net/ax25/sysctl_net_ax25.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * Copyright (C) 1996 Mike Shaver (shaver@zeroknowledge.com)
   8  */
   9 #include <linux/mm.h>
  10 #include <linux/sysctl.h>
  11 #include <linux/spinlock.h>
  12 #include <net/ax25.h>
  13
  14 static int min_ipdefmode[1],            max_ipdefmode[] = {1};
  15 static int min_axdefmode[1],            max_axdefmode[] = {1};
  16 static int min_backoff[1],              max_backoff[] = {2};
  17 static int min_conmode[1],              max_conmode[] = {2};
  18 static int min_window[] = {1},          max_window[] = {7};
  19 static int min_ewindow[] = {1},         max_ewindow[] = {63};
  20 static int min_t1[] = {1},              max_t1[] = {30000};
  21 static int min_t2[] = {1},              max_t2[] = {20000};
  22 static int min_t3[1],                   max_t3[] = {3600000};
  23 static int min_idle[1],                 max_idle[] = {65535000};
  24 static int min_n2[] = {1},              max_n2[] = {31};
  25 static int min_paclen[] = {1},          max_paclen[] = {512};
  26 static int min_proto[1],                max_proto[] = { AX25_PROTO_MAX };
  27 #ifdef CONFIG_AX25_DAMA_SLAVE
  28 static int min_ds_timeout[1],           max_ds_timeout[] = {65535000};
  29 #endif
  30
  31 static struct ctl_table_header *ax25_table_header;
  32
  33 static ctl_table *ax25_table;
  34 static int ax25_table_size;
  35
  36 static struct ctl_path ax25_path[] = {
  37         { .procname = "net", .ctl_name = CTL_NET, },
  38         { .procname = "ax25", .ctl_name = NET_AX25, },
  39         { }
  40 };
  41
  42 static const ctl_table ax25_param_table[] = {
  43         {
  44                 .ctl_name       = NET_AX25_IP_DEFAULT_MODE,
  45                 .procname       = "ip_default_mode",
  46                 .maxlen         = sizeof(int),
  47                 .mode           = 0644,
  48                 .proc_handler   = proc_dointvec_minmax,
  49                 .strategy       = sysctl_intvec,
  50                 .extra1         = &min_ipdefmode,
  51                 .extra2         = &max_ipdefmode
  52         },
  53         {
  54                 .ctl_name       = NET_AX25_DEFAULT_MODE,
  55                 .procname       = "ax25_default_mode",
  56                 .maxlen         = sizeof(int),
  57                 .mode           = 0644,
  58                 .proc_handler   = proc_dointvec_minmax,
  59                 .strategy       = sysctl_intvec,
  60                 .extra1         = &min_axdefmode,
  61                 .extra2         = &max_axdefmode
  62         },
  63         {
  64                 .ctl_name       = NET_AX25_BACKOFF_TYPE,
  65                 .procname       = "backoff_type",
  66                 .maxlen         = sizeof(int),
  67                 .mode           = 0644,
  68                 .proc_handler   = proc_dointvec_minmax,
  69                 .strategy       = sysctl_intvec,
  70                 .extra1         = &min_backoff,
  71                 .extra2         = &max_backoff
  72         },
  73         {
  74                 .ctl_name       = NET_AX25_CONNECT_MODE,
  75                 .procname       = "connect_mode",
  76                 .maxlen         = sizeof(int),
  77                 .mode           = 0644,
  78                 .proc_handler   = proc_dointvec_minmax,
  79                 .strategy       = sysctl_intvec,
  80                 .extra1         = &min_conmode,
  81                 .extra2         = &max_conmode
  82         },
  83         {
  84                 .ctl_name       = NET_AX25_STANDARD_WINDOW,
  85                 .procname       = "standard_window_size",
  86                 .maxlen         = sizeof(int),
  87                 .mode           = 0644,
  88                 .proc_handler   = proc_dointvec_minmax,
  89                 .strategy       = sysctl_intvec,
  90                 .extra1         = &min_window,
  91                 .extra2         = &max_window
  92         },
  93         {
  94                 .ctl_name       = NET_AX25_EXTENDED_WINDOW,
  95                 .procname       = "extended_window_size",
  96                 .maxlen         = sizeof(int),
  97                 .mode           = 0644,
  98                 .proc_handler   = proc_dointvec_minmax,
  99                 .strategy       = sysctl_intvec,
 100                 .extra1         = &min_ewindow,
 101                 .extra2         = &max_ewindow
 102         },
 103         {
 104                 .ctl_name       = NET_AX25_T1_TIMEOUT,
 105                 .procname       = "t1_timeout",
 106                 .maxlen         = sizeof(int),
 107                 .mode           = 0644,
 108                 .proc_handler   = proc_dointvec_minmax,
 109                 .strategy       = sysctl_intvec,
 110                 .extra1         = &min_t1,
 111                 .extra2         = &max_t1
 112         },
 113         {
 114                 .ctl_name       = NET_AX25_T2_TIMEOUT,
 115                 .procname       = "t2_timeout",
 116                 .maxlen         = sizeof(int),
 117                 .mode           = 0644,
 118                 .proc_handler   = proc_dointvec_minmax,
 119                 .strategy       = sysctl_intvec,
 120                 .extra1         = &min_t2,
 121                 .extra2         = &max_t2
 122         },
 123         {
 124                 .ctl_name       = NET_AX25_T3_TIMEOUT,
 125                 .procname       = "t3_timeout",
 126                 .maxlen         = sizeof(int),
 127                 .mode           = 0644,
 128                 .proc_handler   = proc_dointvec_minmax,
 129                 .strategy       = sysctl_intvec,
 130                 .extra1         = &min_t3,
 131                 .extra2         = &max_t3
 132         },
 133         {
 134                 .ctl_name       = NET_AX25_IDLE_TIMEOUT,
 135                 .procname       = "idle_timeout",
 136                 .maxlen         = sizeof(int),
 137                 .mode           = 0644,
 138                 .proc_handler   = proc_dointvec_minmax,
 139                 .strategy       = sysctl_intvec,
 140                 .extra1         = &min_idle,
 141                 .extra2         = &max_idle
 142         },
 143         {
 144                 .ctl_name       = NET_AX25_N2,
 145                 .procname       = "maximum_retry_count",
 146                 .maxlen         = sizeof(int),
 147                 .mode           = 0644,
 148                 .proc_handler   = proc_dointvec_minmax,
 149                 .strategy       = sysctl_intvec,
 150                 .extra1         = &min_n2,
 151                 .extra2         = &max_n2
 152         },
 153         {
 154                 .ctl_name       = NET_AX25_PACLEN,
 155                 .procname       = "maximum_packet_length",
 156                 .maxlen         = sizeof(int),
 157                 .mode           = 0644,
 158                 .proc_handler   = proc_dointvec_minmax,
 159                 .strategy       = sysctl_intvec,
 160                 .extra1         = &min_paclen,
 161                 .extra2         = &max_paclen
 162         },
 163         {
 164                 .ctl_name       = NET_AX25_PROTOCOL,
 165                 .procname       = "protocol",
 166                 .maxlen         = sizeof(int),
 167                 .mode           = 0644,
 168                 .proc_handler   = proc_dointvec_minmax,
 169                 .strategy       = sysctl_intvec,
 170                 .extra1         = &min_proto,
 171                 .extra2         = &max_proto
 172         },
 173 #ifdef CONFIG_AX25_DAMA_SLAVE
 174         {
 175                 .ctl_name       = NET_AX25_DAMA_SLAVE_TIMEOUT,
 176                 .procname       = "dama_slave_timeout",
 177                 .maxlen         = sizeof(int),
 178                 .mode           = 0644,
 179                 .proc_handler   = proc_dointvec_minmax,
 180                 .strategy       = sysctl_intvec,
 181                 .extra1         = &min_ds_timeout,
 182                 .extra2         = &max_ds_timeout
 183         },
 184 #endif
 185
 186         { .ctl_name = 0 }       /* that's all, folks! */
 187 };
 188
 189 void ax25_register_sysctl(void)
 190 {
 191         ax25_dev *ax25_dev;
 192         int n, k;
 193
 194         spin_lock_bh(&ax25_dev_lock);
 195         for (ax25_table_size = sizeof(ctl_table), ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
 196                 ax25_table_size += sizeof(ctl_table);
 197
 198         if ((ax25_table = kzalloc(ax25_table_size, GFP_ATOMIC)) == NULL) {
 199                 spin_unlock_bh(&ax25_dev_lock);
 200                 return;
 201         }
 202
 203         for (n = 0, ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next) {
 204                 struct ctl_table *child = kmemdup(ax25_param_table,
 205                                                   sizeof(ax25_param_table),
 206                                                   GFP_ATOMIC);
 207                 if (!child) {
 208                         while (n--)
 209                                 kfree(ax25_table[n].child);
 210                         kfree(ax25_table);
 211                         spin_unlock_bh(&ax25_dev_lock);
 212                         return;
 213                 }
 214                 ax25_table[n].child = ax25_dev->systable = child;
 215                 ax25_table[n].ctl_name     = n + 1;
 216                 ax25_table[n].procname     = ax25_dev->dev->name;
 217                 ax25_table[n].mode         = 0555;
 218
 219                 child[AX25_MAX_VALUES].ctl_name = 0;    /* just in case... */
 220
 221                 for (k = 0; k < AX25_MAX_VALUES; k++)
 222                         child[k].data = &ax25_dev->values[k];
 223
 224                 n++;
 225         }
 226         spin_unlock_bh(&ax25_dev_lock);
 227
 228         ax25_table_header = register_sysctl_paths(ax25_path, ax25_table);
 229 }
 230
 231 void ax25_unregister_sysctl(void)
 232 {
 233         ctl_table *p;
 234         unregister_sysctl_table(ax25_table_header);
 235
 236         for (p = ax25_table; p->ctl_name; p++)
 237                 kfree(p->child);
 238         kfree(ax25_table);
 239 }