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 struct ctl_path ax25_path[] = {
  35         { .procname = "net", .ctl_name = CTL_NET, },
  36         { .procname = "ax25", .ctl_name = NET_AX25, },
  37         { }
  38 };
  39 static const ctl_table ax25_param_table[] = {
  40         {
  41                 .ctl_name       = NET_AX25_IP_DEFAULT_MODE,
  42                 .procname       = "ip_default_mode",
  43                 .maxlen         = sizeof(int),
  44                 .mode           = 0644,
  45                 .proc_handler   = &proc_dointvec_minmax,
  46                 .strategy       = &sysctl_intvec,
  47                 .extra1         = &min_ipdefmode,
  48                 .extra2         = &max_ipdefmode
  49         },
  50         {
  51                 .ctl_name       = NET_AX25_DEFAULT_MODE,
  52                 .procname       = "ax25_default_mode",
  53                 .maxlen         = sizeof(int),
  54                 .mode           = 0644,
  55                 .proc_handler   = &proc_dointvec_minmax,
  56                 .strategy       = &sysctl_intvec,
  57                 .extra1         = &min_axdefmode,
  58                 .extra2         = &max_axdefmode
  59         },
  60         {
  61                 .ctl_name       = NET_AX25_BACKOFF_TYPE,
  62                 .procname       = "backoff_type",
  63                 .maxlen         = sizeof(int),
  64                 .mode           = 0644,
  65                 .proc_handler   = &proc_dointvec_minmax,
  66                 .strategy       = &sysctl_intvec,
  67                 .extra1         = &min_backoff,
  68                 .extra2         = &max_backoff
  69         },
  70         {
  71                 .ctl_name       = NET_AX25_CONNECT_MODE,
  72                 .procname       = "connect_mode",
  73                 .maxlen         = sizeof(int),
  74                 .mode           = 0644,
  75                 .proc_handler   = &proc_dointvec_minmax,
  76                 .strategy       = &sysctl_intvec,
  77                 .extra1         = &min_conmode,
  78                 .extra2         = &max_conmode
  79         },
  80         {
  81                 .ctl_name       = NET_AX25_STANDARD_WINDOW,
  82                 .procname       = "standard_window_size",
  83                 .maxlen         = sizeof(int),
  84                 .mode           = 0644,
  85                 .proc_handler   = &proc_dointvec_minmax,
  86                 .strategy       = &sysctl_intvec,
  87                 .extra1         = &min_window,
  88                 .extra2         = &max_window
  89         },
  90         {
  91                 .ctl_name       = NET_AX25_EXTENDED_WINDOW,
  92                 .procname       = "extended_window_size",
  93                 .maxlen         = sizeof(int),
  94                 .mode           = 0644,
  95                 .proc_handler   = &proc_dointvec_minmax,
  96                 .strategy       = &sysctl_intvec,
  97                 .extra1         = &min_ewindow,
  98                 .extra2         = &max_ewindow
  99         },
 100         {
 101                 .ctl_name       = NET_AX25_T1_TIMEOUT,
 102                 .procname       = "t1_timeout",
 103                 .maxlen         = sizeof(int),
 104                 .mode           = 0644,
 105                 .proc_handler   = &proc_dointvec_minmax,
 106                 .strategy       = &sysctl_intvec,
 107                 .extra1         = &min_t1,
 108                 .extra2         = &max_t1
 109         },
 110         {
 111                 .ctl_name       = NET_AX25_T2_TIMEOUT,
 112                 .procname       = "t2_timeout",
 113                 .maxlen         = sizeof(int),
 114                 .mode           = 0644,
 115                 .proc_handler   = &proc_dointvec_minmax,
 116                 .strategy       = &sysctl_intvec,
 117                 .extra1         = &min_t2,
 118                 .extra2         = &max_t2
 119         },
 120         {
 121                 .ctl_name       = NET_AX25_T3_TIMEOUT,
 122                 .procname       = "t3_timeout",
 123                 .maxlen         = sizeof(int),
 124                 .mode           = 0644,
 125                 .proc_handler   = &proc_dointvec_minmax,
 126                 .strategy       = &sysctl_intvec,
 127                 .extra1         = &min_t3,
 128                 .extra2         = &max_t3
 129         },
 130         {
 131                 .ctl_name       = NET_AX25_IDLE_TIMEOUT,
 132                 .procname       = "idle_timeout",
 133                 .maxlen         = sizeof(int),
 134                 .mode           = 0644,
 135                 .proc_handler   = &proc_dointvec_minmax,
 136                 .strategy       = &sysctl_intvec,
 137                 .extra1         = &min_idle,
 138                 .extra2         = &max_idle
 139         },
 140         {
 141                 .ctl_name       = NET_AX25_N2,
 142                 .procname       = "maximum_retry_count",
 143                 .maxlen         = sizeof(int),
 144                 .mode           = 0644,
 145                 .proc_handler   = &proc_dointvec_minmax,
 146                 .strategy       = &sysctl_intvec,
 147                 .extra1         = &min_n2,
 148                 .extra2         = &max_n2
 149         },
 150         {
 151                 .ctl_name       = NET_AX25_PACLEN,
 152                 .procname       = "maximum_packet_length",
 153                 .maxlen         = sizeof(int),
 154                 .mode           = 0644,
 155                 .proc_handler   = &proc_dointvec_minmax,
 156                 .strategy       = &sysctl_intvec,
 157                 .extra1         = &min_paclen,
 158                 .extra2         = &max_paclen
 159         },
 160         {
 161                 .ctl_name       = NET_AX25_PROTOCOL,
 162                 .procname       = "protocol",
 163                 .maxlen         = sizeof(int),
 164                 .mode           = 0644,
 165                 .proc_handler   = &proc_dointvec_minmax,
 166                 .strategy       = &sysctl_intvec,
 167                 .extra1         = &min_proto,
 168                 .extra2         = &max_proto
 169         },
 170         {
 171                 .ctl_name       = NET_AX25_DAMA_SLAVE_TIMEOUT,
 172                 .procname       = "dama_slave_timeout",
 173                 .maxlen         = sizeof(int),
 174                 .mode           = 0644,
 175                 .proc_handler   = &proc_dointvec_minmax,
 176                 .strategy       = &sysctl_intvec,
 177                 .extra1         = &min_ds_timeout,
 178                 .extra2         = &max_ds_timeout
 179         },
 180         { .ctl_name = 0 }       /* that's all, folks! */
 181 };
 182
 183 void ax25_register_sysctl(void)
 184 {
 185         ax25_dev *ax25_dev;
 186         int n, k;
 187
 188         spin_lock_bh(&ax25_dev_lock);
 189         for (ax25_table_size = sizeof(ctl_table), ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
 190                 ax25_table_size += sizeof(ctl_table);
 191
 192         if ((ax25_table = kzalloc(ax25_table_size, GFP_ATOMIC)) == NULL) {
 193                 spin_unlock_bh(&ax25_dev_lock);
 194                 return;
 195         }
 196
 197         for (n = 0, ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next) {
 198                 struct ctl_table *child = kmemdup(ax25_param_table,
 199                                                   sizeof(ax25_param_table),
 200                                                   GFP_ATOMIC);
 201                 if (!child) {
 202                         while (n--)
 203                                 kfree(ax25_table[n].child);
 204                         kfree(ax25_table);
 205                         spin_unlock_bh(&ax25_dev_lock);
 206                         return;
 207                 }
 208                 ax25_table[n].child = ax25_dev->systable = child;
 209                 ax25_table[n].ctl_name     = n + 1;
 210                 ax25_table[n].procname     = ax25_dev->dev->name;
 211                 ax25_table[n].mode         = 0555;
 212
 213 #ifndef CONFIG_AX25_DAMA_SLAVE
 214                 /*
 215                  * We do not wish to have a representation of this parameter
 216                  * in /proc/sys/ when configured *not* to include the
 217                  * AX.25 DAMA slave code, do we?
 218                  */
 219
 220                 child[AX25_VALUES_DS_TIMEOUT].procname = NULL;
 221 #endif
 222
 223                 child[AX25_MAX_VALUES].ctl_name = 0;    /* just in case... */
 224
 225                 for (k = 0; k < AX25_MAX_VALUES; k++)
 226                         child[k].data = &ax25_dev->values[k];
 227
 228                 n++;
 229         }
 230         spin_unlock_bh(&ax25_dev_lock);
 231
 232         ax25_table_header = register_sysctl_paths(ax25_path, ax25_table);
 233 }
 234
 235 void ax25_unregister_sysctl(void)
 236 {
 237         ctl_table *p;
 238         unregister_sysctl_table(ax25_table_header);
 239
 240         for (p = ax25_table; p->ctl_name; p++)
 241                 kfree(p->child);
 242         kfree(ax25_table);
 243 }