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 u8 ieee80211_freq_to_channel(struct ieee80211_device * ieee, u32 freq)
  98 {
  99         int i;
 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         freq /= 100000;
 107
 108         if (ieee->freq_band & IEEE80211_24GHZ_BAND)
 109                 for (i = 0; i < ieee->geo.bg_channels; i++)
 110                         if (ieee->geo.bg[i].freq == freq)
 111                                 return ieee->geo.bg[i].channel;
 112
 113         if (ieee->freq_band & IEEE80211_52GHZ_BAND)
 114                 for (i = 0; i < ieee->geo.a_channels; i++)
 115                         if (ieee->geo.a[i].freq == freq)
 116                                 return ieee->geo.a[i].channel;
 117
 118         return 0;
 119 }
 120
 121 int ieee80211_set_geo(struct ieee80211_device *ieee,
 122                       const struct ieee80211_geo *geo)
 123 {
 124         memcpy(ieee->geo.name, geo->name, 3);
 125         ieee->geo.name[3] = '\0';
 126         ieee->geo.bg_channels = geo->bg_channels;
 127         ieee->geo.a_channels = geo->a_channels;
 128         memcpy(ieee->geo.bg, geo->bg, geo->bg_channels *
 129                sizeof(struct ieee80211_channel));
 130         memcpy(ieee->geo.a, geo->a, ieee->geo.a_channels *
 131                sizeof(struct ieee80211_channel));
 132         return 0;
 133 }
 134
 135 const struct ieee80211_geo *ieee80211_get_geo(struct ieee80211_device *ieee)
 136 {
 137         return &ieee->geo;
 138 }
 139
 140 u8 ieee80211_get_channel_flags(struct ieee80211_device * ieee, u8 channel)
 141 {
 142         int index = ieee80211_channel_to_index(ieee, channel);
 143
 144         if (index == -1)
 145                 return IEEE80211_CH_INVALID;
 146
 147         if (channel <= IEEE80211_24GHZ_CHANNELS)
 148                 return ieee->geo.bg[index].flags;
 149
 150         return ieee->geo.a[index].flags;
 151 }
 152
 153 static const struct ieee80211_channel bad_channel = {
 154         .channel = 0,
 155         .flags = IEEE80211_CH_INVALID,
 156         .max_power = 0,
 157 };
 158
 159 const struct ieee80211_channel *ieee80211_get_channel(struct ieee80211_device
 160                                                       *ieee, u8 channel)
 161 {
 162         int index = ieee80211_channel_to_index(ieee, channel);
 163
 164         if (index == -1)
 165                 return &bad_channel;
 166
 167         if (channel <= IEEE80211_24GHZ_CHANNELS)
 168                 return &ieee->geo.bg[index];
 169
 170         return &ieee->geo.a[index];
 171 }
 172
 173 EXPORT_SYMBOL(ieee80211_get_channel);
 174 EXPORT_SYMBOL(ieee80211_get_channel_flags);
 175 EXPORT_SYMBOL(ieee80211_is_valid_channel);
 176 EXPORT_SYMBOL(ieee80211_freq_to_channel);
 177 EXPORT_SYMBOL(ieee80211_channel_to_index);
 178 EXPORT_SYMBOL(ieee80211_set_geo);
 179 EXPORT_SYMBOL(ieee80211_get_geo);