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         BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 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->mode & IEEE_G) ||
  62                              !(ieee->geo.bg[i].flags & IEEE80211_CH_B_ONLY)))
  63                                 return IEEE80211_24GHZ_BAND;
  64
  65         if (ieee->freq_band & IEEE80211_52GHZ_BAND)
  66                 for (i = 0; i < ieee->geo.a_channels; i++)
  67                         if (ieee->geo.a[i].channel == channel)
  68                                 return IEEE80211_52GHZ_BAND;
  69
  70         return 0;
  71 }
  72
  73 int ieee80211_channel_to_index(struct ieee80211_device *ieee, u8 channel)
  74 {
  75         int i;
  76
  77         /* Driver needs to initialize the geography map before using
  78          * these helper functions */
  79         BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
  80
  81         if (ieee->freq_band & IEEE80211_24GHZ_BAND)
  82                 for (i = 0; i < ieee->geo.bg_channels; i++)
  83                         if (ieee->geo.bg[i].channel == channel)
  84                                 return i;
  85
  86         if (ieee->freq_band & IEEE80211_52GHZ_BAND)
  87                 for (i = 0; i < ieee->geo.a_channels; i++)
  88                         if (ieee->geo.a[i].channel == channel)
  89                                 return i;
  90
  91         return -1;
  92 }
  93
  94 u8 ieee80211_freq_to_channel(struct ieee80211_device * ieee, u32 freq)
  95 {
  96         int i;
  97
  98         /* Driver needs to initialize the geography map before using
  99          * these helper functions */
 100         BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
 101
 102         freq /= 100000;
 103
 104         if (ieee->freq_band & IEEE80211_24GHZ_BAND)
 105                 for (i = 0; i < ieee->geo.bg_channels; i++)
 106                         if (ieee->geo.bg[i].freq == freq)
 107                                 return ieee->geo.bg[i].channel;
 108
 109         if (ieee->freq_band & IEEE80211_52GHZ_BAND)
 110                 for (i = 0; i < ieee->geo.a_channels; i++)
 111                         if (ieee->geo.a[i].freq == freq)
 112                                 return ieee->geo.a[i].channel;
 113
 114         return 0;
 115 }
 116
 117 int ieee80211_set_geo(struct ieee80211_device *ieee,
 118                       const struct ieee80211_geo *geo)
 119 {
 120         memcpy(ieee->geo.name, geo->name, 3);
 121         ieee->geo.name[3] = '\0';
 122         ieee->geo.bg_channels = geo->bg_channels;
 123         ieee->geo.a_channels = geo->a_channels;
 124         memcpy(ieee->geo.bg, geo->bg, geo->bg_channels *
 125                sizeof(struct ieee80211_channel));
 126         memcpy(ieee->geo.a, geo->a, ieee->geo.a_channels *
 127                sizeof(struct ieee80211_channel));
 128         return 0;
 129 }
 130
 131 const struct ieee80211_geo *ieee80211_get_geo(struct ieee80211_device *ieee)
 132 {
 133         return &ieee->geo;
 134 }
 135
 136 EXPORT_SYMBOL(ieee80211_is_valid_channel);
 137 EXPORT_SYMBOL(ieee80211_freq_to_channel);
 138 EXPORT_SYMBOL(ieee80211_channel_to_index);
 139 EXPORT_SYMBOL(ieee80211_set_geo);
 140 EXPORT_SYMBOL(ieee80211_get_geo);