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/config.h>
  28 #include <linux/errno.h>
  29 #include <linux/if_arp.h>
  30 #include <linux/in6.h>
  31 #include <linux/in.h>
  32 #include <linux/ip.h>
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/netdevice.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/skbuff.h>
  38 #include <linux/slab.h>
  39 #include <linux/tcp.h>
  40 #include <linux/types.h>
  41 #include <linux/wireless.h>
  42 #include <linux/etherdevice.h>
  43 #include <asm/uaccess.h>
  44
  45 #include <net/ieee80211.h>
  46
  47 int ieee80211_is_valid_channel(struct ieee80211_device *ieee, u8 channel)
  48 {
  49         int i;
  50
  51         /* Driver needs to initialize the geography map before using
  52          * these helper functions */
  53         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
  54                 return 0;
  55
  56         if (ieee->freq_band & IEEE80211_24GHZ_BAND)
  57                 for (i = 0; i < ieee->geo.bg_channels; i++)
  58                         /* NOTE: If G mode is currently supported but
  59                          * this is a B only channel, we don't see it
  60                          * as valid. */
  61                         if ((ieee->geo.bg[i].channel == channel) &&
  62                             !(ieee->geo.bg[i].flags & IEEE80211_CH_INVALID) &&
  63                             (!(ieee->mode & IEEE_G) ||
  64                              !(ieee->geo.bg[i].flags & IEEE80211_CH_B_ONLY)))
  65                                 return IEEE80211_24GHZ_BAND;
  66
  67         if (ieee->freq_band & IEEE80211_52GHZ_BAND)
  68                 for (i = 0; i < ieee->geo.a_channels; i++)
  69                         if ((ieee->geo.a[i].channel == channel) &&
  70                             !(ieee->geo.a[i].flags & IEEE80211_CH_INVALID))
  71                                 return IEEE80211_52GHZ_BAND;
  72
  73         return 0;
  74 }
  75
  76 int ieee80211_channel_to_index(struct ieee80211_device *ieee, u8 channel)
  77 {
  78         int i;
  79
  80         /* Driver needs to initialize the geography map before using
  81          * these helper functions */
  82         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
  83                 return -1;
  84
  85         if (ieee->freq_band & IEEE80211_24GHZ_BAND)
  86                 for (i = 0; i < ieee->geo.bg_channels; i++)
  87                         if (ieee->geo.bg[i].channel == channel)
  88                                 return i;
  89
  90         if (ieee->freq_band & IEEE80211_52GHZ_BAND)
  91                 for (i = 0; i < ieee->geo.a_channels; i++)
  92                         if (ieee->geo.a[i].channel == channel)
  93                                 return i;
  94
  95         return -1;
  96 }
  97
  98 u8 ieee80211_freq_to_channel(struct ieee80211_device * ieee, u32 freq)
  99 {
 100         int i;
 101
 102         /* Driver needs to initialize the geography map before using
 103          * these helper functions */
 104         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
 105                 return 0;
 106
 107         freq /= 100000;
 108
 109         if (ieee->freq_band & IEEE80211_24GHZ_BAND)
 110                 for (i = 0; i < ieee->geo.bg_channels; i++)
 111                         if (ieee->geo.bg[i].freq == freq)
 112                                 return ieee->geo.bg[i].channel;
 113
 114         if (ieee->freq_band & IEEE80211_52GHZ_BAND)
 115                 for (i = 0; i < ieee->geo.a_channels; i++)
 116                         if (ieee->geo.a[i].freq == freq)
 117                                 return ieee->geo.a[i].channel;
 118
 119         return 0;
 120 }
 121
 122 int ieee80211_set_geo(struct ieee80211_device *ieee,
 123                       const struct ieee80211_geo *geo)
 124 {
 125         memcpy(ieee->geo.name, geo->name, 3);
 126         ieee->geo.name[3] = '\0';
 127         ieee->geo.bg_channels = geo->bg_channels;
 128         ieee->geo.a_channels = geo->a_channels;
 129         memcpy(ieee->geo.bg, geo->bg, geo->bg_channels *
 130                sizeof(struct ieee80211_channel));
 131         memcpy(ieee->geo.a, geo->a, ieee->geo.a_channels *
 132                sizeof(struct ieee80211_channel));
 133         return 0;
 134 }
 135
 136 const struct ieee80211_geo *ieee80211_get_geo(struct ieee80211_device *ieee)
 137 {
 138         return &ieee->geo;
 139 }
 140
 141 u8 ieee80211_get_channel_flags(struct ieee80211_device * ieee, u8 channel)
 142 {
 143         int index = ieee80211_channel_to_index(ieee, channel);
 144
 145         if (index == -1)
 146                 return IEEE80211_CH_INVALID;
 147
 148         if (channel <= IEEE80211_24GHZ_CHANNELS)
 149                 return ieee->geo.bg[index].flags;
 150
 151         return ieee->geo.a[index].flags;
 152 }
 153
 154 static const struct ieee80211_channel bad_channel = {
 155         .channel = 0,
 156         .flags = IEEE80211_CH_INVALID,
 157         .max_power = 0,
 158 };
 159
 160 const struct ieee80211_channel *ieee80211_get_channel(struct ieee80211_device
 161                                                       *ieee, u8 channel)
 162 {
 163         int index = ieee80211_channel_to_index(ieee, channel);
 164
 165         if (index == -1)
 166                 return &bad_channel;
 167
 168         if (channel <= IEEE80211_24GHZ_CHANNELS)
 169                 return &ieee->geo.bg[index];
 170
 171         return &ieee->geo.a[index];
 172 }
 173
 174 EXPORT_SYMBOL(ieee80211_get_channel);
 175 EXPORT_SYMBOL(ieee80211_get_channel_flags);
 176 EXPORT_SYMBOL(ieee80211_is_valid_channel);
 177 EXPORT_SYMBOL(ieee80211_freq_to_channel);
 178 EXPORT_SYMBOL(ieee80211_channel_to_index);
 179 EXPORT_SYMBOL(ieee80211_set_geo);
 180 EXPORT_SYMBOL(ieee80211_get_geo);