net/ieee80211/ieee80211_geo.c

   1 /******************************************************************************
   2
   3   Copyright(c) 2005 Intel Corporation. All rights reserved.
   4
   5   This program is free software; you can redistribute it and/or modify it
   6   under the terms of version 2 of the GNU General Public License as
   7   published by the Free Software Foundation.
   8
   9   This program is distributed in the hope that it will be useful, but WITHOUT
  10   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12   more details.
  13
  14   You should have received a copy of the GNU General Public License along with
  15   this program; if not, write to the Free Software Foundation, Inc., 59
  16   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17
  18   The full GNU General Public License is included in this distribution in the
  19   file called LICENSE.
  20
  21   Contact Information:
  22   James P. Ketrenos <ipw2100-admin@linux.intel.com>
  23   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24
  25 ******************************************************************************/
  26 #include <linux/compiler.h>
  27 #include <linux/errno.h>
  28 #include <linux/if_arp.h>
  29 #include <linux/in6.h>
  30 #include <linux/in.h>
  31 #include <linux/ip.h>
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/proc_fs.h>
  36 #include <linux/skbuff.h>
  37 #include <linux/slab.h>
  38 #include <linux/tcp.h>
  39 #include <linux/types.h>
  40 #include <linux/wireless.h>
  41 #include <linux/etherdevice.h>
  42 #include <asm/uaccess.h>
  43
  44 #include <net/ieee80211.h>
  45
  46 int ieee80211_is_valid_channel(struct ieee80211_device *ieee, u8 channel)
  47 {
  48         int i;
  49
  50         /* Driver needs to initialize the geography map before using
  51          * these helper functions */
  52         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
  53                 return 0;
  54
  55         if (ieee->freq_band & IEEE80211_24GHZ_BAND)
  56                 for (i = 0; i < ieee->geo.bg_channels; i++)
  57                         /* NOTE: If G mode is currently supported but
  58                          * this is a B only channel, we don't see it
  59                          * as valid. */
  60                         if ((ieee->geo.bg[i].channel == channel) &&
  61                             !(ieee->geo.bg[i].flags & IEEE80211_CH_INVALID) &&
  62                             (!(ieee->mode & IEEE_G) ||
  63                              !(ieee->geo.bg[i].flags & IEEE80211_CH_B_ONLY)))
  64                                 return IEEE80211_24GHZ_BAND;
  65
  66         if (ieee->freq_band & IEEE80211_52GHZ_BAND)
  67                 for (i = 0; i < ieee->geo.a_channels; i++)
  68                         if ((ieee->geo.a[i].channel == channel) &&
  69                             !(ieee->geo.a[i].flags & IEEE80211_CH_INVALID))
  70                                 return IEEE80211_52GHZ_BAND;
  71
  72         return 0;
  73 }
  74
  75 int ieee80211_channel_to_index(struct ieee80211_device *ieee, u8 channel)
  76 {
  77         int i;
  78
  79         /* Driver needs to initialize the geography map before using
  80          * these helper functions */
  81         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
  82                 return -1;
  83
  84         if (ieee->freq_band & IEEE80211_24GHZ_BAND)
  85                 for (i = 0; i < ieee->geo.bg_channels; i++)
  86                         if (ieee->geo.bg[i].channel == channel)
  87                                 return i;
  88
  89         if (ieee->freq_band & IEEE80211_52GHZ_BAND)
  90                 for (i = 0; i < ieee->geo.a_channels; i++)
  91                         if (ieee->geo.a[i].channel == channel)
  92                                 return i;
  93
  94         return -1;
  95 }
  96
  97 u32 ieee80211_channel_to_freq(struct ieee80211_device * ieee, u8 channel)
  98 {
  99         const struct ieee80211_channel * ch;
 100
 101         /* Driver needs to initialize the geography map before using
 102          * these helper functions */
 103         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
 104                 return 0;
 105
 106         ch = ieee80211_get_channel(ieee, channel);
 107         if (!ch->channel)
 108                 return 0;
 109         return ch->freq;
 110 }
 111
 112 u8 ieee80211_freq_to_channel(struct ieee80211_device * ieee, u32 freq)
 113 {
 114         int i;
 115
 116         /* Driver needs to initialize the geography map before using
 117          * these helper functions */
 118         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
 119                 return 0;
 120
 121         freq /= 100000;
 122
 123         if (ieee->freq_band & IEEE80211_24GHZ_BAND)
 124                 for (i = 0; i < ieee->geo.bg_channels; i++)
 125                         if (ieee->geo.bg[i].freq == freq)
 126                                 return ieee->geo.bg[i].channel;
 127
 128         if (ieee->freq_band & IEEE80211_52GHZ_BAND)
 129                 for (i = 0; i < ieee->geo.a_channels; i++)
 130                         if (ieee->geo.a[i].freq == freq)
 131                                 return ieee->geo.a[i].channel;
 132
 133         return 0;
 134 }
 135
 136 int ieee80211_set_geo(struct ieee80211_device *ieee,
 137                       const struct ieee80211_geo *geo)
 138 {
 139         memcpy(ieee->geo.name, geo->name, 3);
 140         ieee->geo.name[3] = '\0';
 141         ieee->geo.bg_channels = geo->bg_channels;
 142         ieee->geo.a_channels = geo->a_channels;
 143         memcpy(ieee->geo.bg, geo->bg, geo->bg_channels *
 144                sizeof(struct ieee80211_channel));
 145         memcpy(ieee->geo.a, geo->a, ieee->geo.a_channels *
 146                sizeof(struct ieee80211_channel));
 147         return 0;
 148 }
 149
 150 const struct ieee80211_geo *ieee80211_get_geo(struct ieee80211_device *ieee)
 151 {
 152         return &ieee->geo;
 153 }
 154
 155 u8 ieee80211_get_channel_flags(struct ieee80211_device * ieee, u8 channel)
 156 {
 157         int index = ieee80211_channel_to_index(ieee, channel);
 158
 159         if (index == -1)
 160                 return IEEE80211_CH_INVALID;
 161
 162         if (channel <= IEEE80211_24GHZ_CHANNELS)
 163                 return ieee->geo.bg[index].flags;
 164
 165         return ieee->geo.a[index].flags;
 166 }
 167
 168 static const struct ieee80211_channel bad_channel = {
 169         .channel = 0,
 170         .flags = IEEE80211_CH_INVALID,
 171         .max_power = 0,
 172 };
 173
 174 const struct ieee80211_channel *ieee80211_get_channel(struct ieee80211_device
 175                                                       *ieee, u8 channel)
 176 {
 177         int index = ieee80211_channel_to_index(ieee, channel);
 178
 179         if (index == -1)
 180                 return &bad_channel;
 181
 182         if (channel <= IEEE80211_24GHZ_CHANNELS)
 183                 return &ieee->geo.bg[index];
 184
 185         return &ieee->geo.a[index];
 186 }
 187
 188 EXPORT_SYMBOL(ieee80211_get_channel);
 189 EXPORT_SYMBOL(ieee80211_get_channel_flags);
 190 EXPORT_SYMBOL(ieee80211_is_valid_channel);
 191 EXPORT_SYMBOL(ieee80211_freq_to_channel);
 192 EXPORT_SYMBOL(ieee80211_channel_to_freq);
 193 EXPORT_SYMBOL(ieee80211_channel_to_index);
 194 EXPORT_SYMBOL(ieee80211_set_geo);
 195 EXPORT_SYMBOL(ieee80211_get_geo);