Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6] / 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);