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 static int min_ds_timeout[1],           max_ds_timeout[] = {65535000};
  28
  29 static struct ctl_table_header *ax25_table_header;
  30
  31 static ctl_table *ax25_table;
  32 static int ax25_table_size;
  33
  34 static ctl_table ax25_dir_table[] = {
  35         {
  36                 .ctl_name       = NET_AX25,
  37                 .procname       = "ax25",
  38                 .mode           = 0555,
  39         },
  40         { .ctl_name = 0 }
  41 };
  42
  43 static ctl_table ax25_root_table[] = {
  44         {
  45                 .ctl_name       = CTL_NET,
  46                 .procname       = "net",
  47                 .mode           = 0555,
  48                 .child          = ax25_dir_table
  49         },
  50         { .ctl_name = 0 }
  51 };
  52
  53 static const ctl_table ax25_param_table[] = {
  54         {
  55                 .ctl_name       = NET_AX25_IP_DEFAULT_MODE,
  56                 .procname       = "ip_default_mode",
  57                 .maxlen         = sizeof(int),
  58                 .mode           = 0644,
  59                 .proc_handler   = &proc_dointvec_minmax,
  60                 .strategy       = &sysctl_intvec,
  61                 .extra1         = &min_ipdefmode,
  62                 .extra2         = &max_ipdefmode
  63         },
  64         {
  65                 .ctl_name       = NET_AX25_DEFAULT_MODE,
  66                 .procname       = "ax25_default_mode",
  67                 .maxlen         = sizeof(int),
  68                 .mode           = 0644,
  69                 .proc_handler   = &proc_dointvec_minmax,
  70                 .strategy       = &sysctl_intvec,
  71                 .extra1         = &min_axdefmode,
  72                 .extra2         = &max_axdefmode
  73         },
  74         {
  75                 .ctl_name       = NET_AX25_BACKOFF_TYPE,
  76                 .procname       = "backoff_type",
  77                 .maxlen         = sizeof(int),
  78                 .mode           = 0644,
  79                 .proc_handler   = &proc_dointvec_minmax,
  80                 .strategy       = &sysctl_intvec,
  81                 .extra1         = &min_backoff,
  82                 .extra2         = &max_backoff
  83         },
  84         {
  85                 .ctl_name       = NET_AX25_CONNECT_MODE,
  86                 .procname       = "connect_mode",
  87                 .maxlen         = sizeof(int),
  88                 .mode           = 0644,
  89                 .proc_handler   = &proc_dointvec_minmax,
  90                 .strategy       = &sysctl_intvec,
  91                 .extra1         = &min_conmode,
  92                 .extra2         = &max_conmode
  93         },
  94         {
  95                 .ctl_name       = NET_AX25_STANDARD_WINDOW,
  96                 .procname       = "standard_window_size",
  97                 .maxlen         = sizeof(int),
  98                 .mode           = 0644,
  99                 .proc_handler   = &proc_dointvec_minmax,
 100                 .strategy       = &sysctl_intvec,
 101                 .extra1         = &min_window,
 102                 .extra2         = &max_window
 103         },
 104         {
 105                 .ctl_name       = NET_AX25_EXTENDED_WINDOW,
 106                 .procname       = "extended_window_size",
 107                 .maxlen         = sizeof(int),
 108                 .mode           = 0644,
 109                 .proc_handler   = &proc_dointvec_minmax,
 110                 .strategy       = &sysctl_intvec,
 111                 .extra1         = &min_ewindow,
 112                 .extra2         = &max_ewindow
 113         },
 114         {
 115                 .ctl_name       = NET_AX25_T1_TIMEOUT,
 116                 .procname       = "t1_timeout",
 117                 .maxlen         = sizeof(int),
 118                 .mode           = 0644,
 119                 .proc_handler   = &proc_dointvec_minmax,
 120                 .strategy       = &sysctl_intvec,
 121                 .extra1         = &min_t1,
 122                 .extra2         = &max_t1
 123         },
 124         {
 125                 .ctl_name       = NET_AX25_T2_TIMEOUT,
 126                 .procname       = "t2_timeout",
 127                 .maxlen         = sizeof(int),
 128                 .mode           = 0644,
 129                 .proc_handler   = &proc_dointvec_minmax,
 130                 .strategy       = &sysctl_intvec,
 131                 .extra1         = &min_t2,
 132                 .extra2         = &max_t2
 133         },
 134         {
 135                 .ctl_name       = NET_AX25_T3_TIMEOUT,
 136                 .procname       = "t3_timeout",
 137                 .maxlen         = sizeof(int),
 138                 .mode           = 0644,
 139                 .proc_handler   = &proc_dointvec_minmax,
 140                 .strategy       = &sysctl_intvec,
 141                 .extra1         = &min_t3,
 142                 .extra2         = &max_t3
 143         },
 144         {
 145                 .ctl_name       = NET_AX25_IDLE_TIMEOUT,
 146                 .procname       = "idle_timeout",
 147                 .maxlen         = sizeof(int),
 148                 .mode           = 0644,
 149                 .proc_handler   = &proc_dointvec_minmax,
 150                 .strategy       = &sysctl_intvec,
 151                 .extra1         = &min_idle,
 152                 .extra2         = &max_idle
 153         },
 154         {
 155                 .ctl_name       = NET_AX25_N2,
 156                 .procname       = "maximum_retry_count",
 157                 .maxlen         = sizeof(int),
 158                 .mode           = 0644,
 159                 .proc_handler   = &proc_dointvec_minmax,
 160                 .strategy       = &sysctl_intvec,
 161                 .extra1         = &min_n2,
 162                 .extra2         = &max_n2
 163         },
 164         {
 165                 .ctl_name       = NET_AX25_PACLEN,
 166                 .procname       = "maximum_packet_length",
 167                 .maxlen         = sizeof(int),
 168                 .mode           = 0644,
 169                 .proc_handler   = &proc_dointvec_minmax,
 170                 .strategy       = &sysctl_intvec,
 171                 .extra1         = &min_paclen,
 172                 .extra2         = &max_paclen
 173         },
 174         {
 175                 .ctl_name       = NET_AX25_PROTOCOL,
 176                 .procname       = "protocol",
 177                 .maxlen         = sizeof(int),
 178                 .mode           = 0644,
 179                 .proc_handler   = &proc_dointvec_minmax,
 180                 .strategy       = &sysctl_intvec,
 181                 .extra1         = &min_proto,
 182                 .extra2         = &max_proto
 183         },
 184         {
 185                 .ctl_name       = NET_AX25_DAMA_SLAVE_TIMEOUT,
 186                 .procname       = "dama_slave_timeout",
 187                 .maxlen         = sizeof(int),
 188                 .mode           = 0644,
 189                 .proc_handler   = &proc_dointvec_minmax,
 190                 .strategy       = &sysctl_intvec,
 191                 .extra1         = &min_ds_timeout,
 192                 .extra2         = &max_ds_timeout
 193         },
 194         { .ctl_name = 0 }       /* that's all, folks! */
 195 };
 196
 197 void ax25_register_sysctl(void)
 198 {
 199         ax25_dev *ax25_dev;
 200         int n, k;
 201
 202         spin_lock_bh(&ax25_dev_lock);
 203         for (ax25_table_size = sizeof(ctl_table), ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
 204                 ax25_table_size += sizeof(ctl_table);
 205
 206         if ((ax25_table = kzalloc(ax25_table_size, GFP_ATOMIC)) == NULL) {
 207                 spin_unlock_bh(&ax25_dev_lock);
 208                 return;
 209         }
 210
 211         for (n = 0, ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next) {
 212                 struct ctl_table *child = kmemdup(ax25_param_table,
 213                                                   sizeof(ax25_param_table),
 214                                                   GFP_ATOMIC);
 215                 if (!child) {
 216                         while (n--)
 217                                 kfree(ax25_table[n].child);
 218                         kfree(ax25_table);
 219                         spin_unlock_bh(&ax25_dev_lock);
 220                         return;
 221                 }
 222                 ax25_table[n].child = ax25_dev->systable = child;
 223                 ax25_table[n].ctl_name     = n + 1;
 224                 ax25_table[n].procname     = ax25_dev->dev->name;
 225                 ax25_table[n].mode         = 0555;
 226
 227 #ifndef CONFIG_AX25_DAMA_SLAVE
 228                 /*
 229                  * We do not wish to have a representation of this parameter
 230                  * in /proc/sys/ when configured *not* to include the
 231                  * AX.25 DAMA slave code, do we?
 232                  */
 233
 234                 child[AX25_VALUES_DS_TIMEOUT].procname = NULL;
 235 #endif
 236
 237                 child[AX25_MAX_VALUES].ctl_name = 0;    /* just in case... */
 238
 239                 for (k = 0; k < AX25_MAX_VALUES; k++)
 240                         child[k].data = &ax25_dev->values[k];
 241
 242                 n++;
 243         }
 244         spin_unlock_bh(&ax25_dev_lock);
 245
 246         ax25_dir_table[0].child = ax25_table;
 247
 248         ax25_table_header = register_sysctl_table(ax25_root_table);
 249 }
 250
 251 void ax25_unregister_sysctl(void)
 252 {
 253         ctl_table *p;
 254         unregister_sysctl_table(ax25_table_header);
 255
 256         ax25_dir_table[0].child = NULL;
 257         for (p = ax25_table; p->ctl_name; p++)
 258                 kfree(p->child);
 259         kfree(ax25_table);
 260 }