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/config.h>
  10 #include <linux/mm.h>
  11 #include <linux/sysctl.h>
  12 #include <linux/spinlock.h>
  13 #include <net/ax25.h>
  14
  15 static int min_ipdefmode[1],            max_ipdefmode[] = {1};
  16 static int min_axdefmode[1],            max_axdefmode[] = {1};
  17 static int min_backoff[1],              max_backoff[] = {2};
  18 static int min_conmode[1],              max_conmode[] = {2};
  19 static int min_window[] = {1},          max_window[] = {7};
  20 static int min_ewindow[] = {1},         max_ewindow[] = {63};
  21 static int min_t1[] = {1},              max_t1[] = {30 * HZ};
  22 static int min_t2[] = {1},              max_t2[] = {20 * HZ};
  23 static int min_t3[1],                   max_t3[] = {3600 * HZ};
  24 static int min_idle[1],                 max_idle[] = {65535 * HZ};
  25 static int min_n2[] = {1},              max_n2[] = {31};
  26 static int min_paclen[] = {1},          max_paclen[] = {512};
  27 static int min_proto[1],                max_proto[] = { AX25_PROTO_MAX };
  28 static int min_ds_timeout[1],           max_ds_timeout[] = {65535 * HZ};
  29
  30 static struct ctl_table_header *ax25_table_header;
  31
  32 static ctl_table *ax25_table;
  33 static int ax25_table_size;
  34
  35 static ctl_table ax25_dir_table[] = {
  36         {
  37                 .ctl_name       = NET_AX25,
  38                 .procname       = "ax25",
  39                 .mode           = 0555,
  40         },
  41         { .ctl_name = 0 }
  42 };
  43
  44 static ctl_table ax25_root_table[] = {
  45         {
  46                 .ctl_name       = CTL_NET,
  47                 .procname       = "net",
  48                 .mode           = 0555,
  49                 .child          = ax25_dir_table
  50         },
  51         { .ctl_name = 0 }
  52 };
  53
  54 static const ctl_table ax25_param_table[] = {
  55         {
  56                 .ctl_name       = NET_AX25_IP_DEFAULT_MODE,
  57                 .procname       = "ip_default_mode",
  58                 .maxlen         = sizeof(int),
  59                 .mode           = 0644,
  60                 .proc_handler   = &proc_dointvec_minmax,
  61                 .strategy       = &sysctl_intvec,
  62                 .extra1         = &min_ipdefmode,
  63                 .extra2         = &max_ipdefmode
  64         },
  65         {
  66                 .ctl_name       = NET_AX25_DEFAULT_MODE,
  67                 .procname       = "ax25_default_mode",
  68                 .maxlen         = sizeof(int),
  69                 .mode           = 0644,
  70                 .proc_handler   = &proc_dointvec_minmax,
  71                 .strategy       = &sysctl_intvec,
  72                 .extra1         = &min_axdefmode,
  73                 .extra2         = &max_axdefmode
  74         },
  75         {
  76                 .ctl_name       = NET_AX25_BACKOFF_TYPE,
  77                 .procname       = "backoff_type",
  78                 .maxlen         = sizeof(int),
  79                 .mode           = 0644,
  80                 .proc_handler   = &proc_dointvec_minmax,
  81                 .strategy       = &sysctl_intvec,
  82                 .extra1         = &min_backoff,
  83                 .extra2         = &max_backoff
  84         },
  85         {
  86                 .ctl_name       = NET_AX25_CONNECT_MODE,
  87                 .procname       = "connect_mode",
  88                 .maxlen         = sizeof(int),
  89                 .mode           = 0644,
  90                 .proc_handler   = &proc_dointvec_minmax,
  91                 .strategy       = &sysctl_intvec,
  92                 .extra1         = &min_conmode,
  93                 .extra2         = &max_conmode
  94         },
  95         {
  96                 .ctl_name       = NET_AX25_STANDARD_WINDOW,
  97                 .procname       = "standard_window_size",
  98                 .maxlen         = sizeof(int),
  99                 .mode           = 0644,
 100                 .proc_handler   = &proc_dointvec_minmax,
 101                 .strategy       = &sysctl_intvec,
 102                 .extra1         = &min_window,
 103                 .extra2         = &max_window
 104         },
 105         {
 106                 .ctl_name       = NET_AX25_EXTENDED_WINDOW,
 107                 .procname       = "extended_window_size",
 108                 .maxlen         = sizeof(int),
 109                 .mode           = 0644,
 110                 .proc_handler   = &proc_dointvec_minmax,
 111                 .strategy       = &sysctl_intvec,
 112                 .extra1         = &min_ewindow,
 113                 .extra2         = &max_ewindow
 114         },
 115         {
 116                 .ctl_name       = NET_AX25_T1_TIMEOUT,
 117                 .procname       = "t1_timeout",
 118                 .maxlen         = sizeof(int),
 119                 .mode           = 0644,
 120                 .proc_handler   = &proc_dointvec_minmax,
 121                 .strategy       = &sysctl_intvec,
 122                 .extra1         = &min_t1,
 123                 .extra2         = &max_t1
 124         },
 125         {
 126                 .ctl_name       = NET_AX25_T2_TIMEOUT,
 127                 .procname       = "t2_timeout",
 128                 .maxlen         = sizeof(int),
 129                 .mode           = 0644,
 130                 .proc_handler   = &proc_dointvec_minmax,
 131                 .strategy       = &sysctl_intvec,
 132                 .extra1         = &min_t2,
 133                 .extra2         = &max_t2
 134         },
 135         {
 136                 .ctl_name       = NET_AX25_T3_TIMEOUT,
 137                 .procname       = "t3_timeout",
 138                 .maxlen         = sizeof(int),
 139                 .mode           = 0644,
 140                 .proc_handler   = &proc_dointvec_minmax,
 141                 .strategy       = &sysctl_intvec,
 142                 .extra1         = &min_t3,
 143                 .extra2         = &max_t3
 144         },
 145         {
 146                 .ctl_name       = NET_AX25_IDLE_TIMEOUT,
 147                 .procname       = "idle_timeout",
 148                 .maxlen         = sizeof(int),
 149                 .mode           = 0644,
 150                 .proc_handler   = &proc_dointvec_minmax,
 151                 .strategy       = &sysctl_intvec,
 152                 .extra1         = &min_idle,
 153                 .extra2         = &max_idle
 154         },
 155         {
 156                 .ctl_name       = NET_AX25_N2,
 157                 .procname       = "maximum_retry_count",
 158                 .maxlen         = sizeof(int),
 159                 .mode           = 0644,
 160                 .proc_handler   = &proc_dointvec_minmax,
 161                 .strategy       = &sysctl_intvec,
 162                 .extra1         = &min_n2,
 163                 .extra2         = &max_n2
 164         },
 165         {
 166                 .ctl_name       = NET_AX25_PACLEN,
 167                 .procname       = "maximum_packet_length",
 168                 .maxlen         = sizeof(int),
 169                 .mode           = 0644,
 170                 .proc_handler   = &proc_dointvec_minmax,
 171                 .strategy       = &sysctl_intvec,
 172                 .extra1         = &min_paclen,
 173                 .extra2         = &max_paclen
 174         },
 175         {
 176                 .ctl_name       = NET_AX25_PROTOCOL,
 177                 .procname       = "protocol",
 178                 .maxlen         = sizeof(int),
 179                 .mode           = 0644,
 180                 .proc_handler   = &proc_dointvec_minmax,
 181                 .strategy       = &sysctl_intvec,
 182                 .extra1         = &min_proto,
 183                 .extra2         = &max_proto
 184         },
 185         {
 186                 .ctl_name       = NET_AX25_DAMA_SLAVE_TIMEOUT,
 187                 .procname       = "dama_slave_timeout",
 188                 .maxlen         = sizeof(int),
 189                 .mode           = 0644,
 190                 .proc_handler   = &proc_dointvec_minmax,
 191                 .strategy       = &sysctl_intvec,
 192                 .extra1         = &min_ds_timeout,
 193                 .extra2         = &max_ds_timeout
 194         },
 195         { .ctl_name = 0 }       /* that's all, folks! */
 196 };
 197
 198 void ax25_register_sysctl(void)
 199 {
 200         ax25_dev *ax25_dev;
 201         int n, k;
 202
 203         spin_lock_bh(&ax25_dev_lock);
 204         for (ax25_table_size = sizeof(ctl_table), ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
 205                 ax25_table_size += sizeof(ctl_table);
 206
 207         if ((ax25_table = kmalloc(ax25_table_size, GFP_ATOMIC)) == NULL) {
 208                 spin_unlock_bh(&ax25_dev_lock);
 209                 return;
 210         }
 211
 212         memset(ax25_table, 0x00, ax25_table_size);
 213
 214         for (n = 0, ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next) {
 215                 ctl_table *child = kmalloc(sizeof(ax25_param_table), GFP_ATOMIC);
 216                 if (!child) {
 217                         while (n--)
 218                                 kfree(ax25_table[n].child);
 219                         kfree(ax25_table);
 220                         spin_unlock_bh(&ax25_dev_lock);
 221                         return;
 222                 }
 223                 memcpy(child, ax25_param_table, sizeof(ax25_param_table));
 224                 ax25_table[n].child = ax25_dev->systable = child;
 225                 ax25_table[n].ctl_name     = n + 1;
 226                 ax25_table[n].procname     = ax25_dev->dev->name;
 227                 ax25_table[n].mode         = 0555;
 228
 229 #ifndef CONFIG_AX25_DAMA_SLAVE
 230                 /*
 231                  * We do not wish to have a representation of this parameter
 232                  * in /proc/sys/ when configured *not* to include the
 233                  * AX.25 DAMA slave code, do we?
 234                  */
 235
 236                 child[AX25_VALUES_DS_TIMEOUT].procname = NULL;
 237 #endif
 238
 239                 child[AX25_MAX_VALUES].ctl_name = 0;    /* just in case... */
 240
 241                 for (k = 0; k < AX25_MAX_VALUES; k++)
 242                         child[k].data = &ax25_dev->values[k];
 243
 244                 n++;
 245         }
 246         spin_unlock_bh(&ax25_dev_lock);
 247
 248         ax25_dir_table[0].child = ax25_table;
 249
 250         ax25_table_header = register_sysctl_table(ax25_root_table, 1);
 251 }
 252
 253 void ax25_unregister_sysctl(void)
 254 {
 255         ctl_table *p;
 256         unregister_sysctl_table(ax25_table_header);
 257
 258         ax25_dir_table[0].child = NULL;
 259         for (p = ax25_table; p->ctl_name; p++)
 260                 kfree(p->child);
 261         kfree(ax25_table);
 262 }