This commit was manufactured by cvs2svn to create branch 'vserver'.
[linux-2.6.git] / 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);