Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6
[linux-2.6] / net / mac80211 / regdomain.c
1 /*
2  * Copyright 2002-2005, Instant802 Networks, Inc.
3  * Copyright 2005-2006, Devicescape Software, Inc.
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  */
9
10 /*
11  * This regulatory domain control implementation is known to be incomplete
12  * and confusing. mac80211 regulatory domain control will be significantly
13  * reworked in the not-too-distant future.
14  *
15  * For now, drivers wishing to control which channels are and aren't available
16  * are advised as follows:
17  *  - set the IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED flag
18  *  - continue to include *ALL* possible channels in the modes registered
19  *    through ieee80211_register_hwmode()
20  *  - for each allowable ieee80211_channel structure registered in the above
21  *    call, set the flag member to some meaningful value such as
22  *    IEEE80211_CHAN_W_SCAN | IEEE80211_CHAN_W_ACTIVE_SCAN |
23  *    IEEE80211_CHAN_W_IBSS.
24  *  - leave flag as 0 for non-allowable channels
25  *
26  * The usual implementation is for a driver to read a device EEPROM to
27  * determine which regulatory domain it should be operating under, then
28  * looking up the allowable channels in a driver-local table, then performing
29  * the above.
30  */
31
32 #include <linux/module.h>
33 #include <linux/netdevice.h>
34 #include <net/mac80211.h>
35 #include "ieee80211_i.h"
36
37 static int ieee80211_regdom = 0x10; /* FCC */
38 module_param(ieee80211_regdom, int, 0444);
39 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain; 64=MKK");
40
41 /*
42  * If firmware is upgraded by the vendor, additional channels can be used based
43  * on the new Japanese regulatory rules. This is indicated by setting
44  * ieee80211_japan_5ghz module parameter to one when loading the 80211 kernel
45  * module.
46  */
47 static int ieee80211_japan_5ghz /* = 0 */;
48 module_param(ieee80211_japan_5ghz, int, 0444);
49 MODULE_PARM_DESC(ieee80211_japan_5ghz, "Vendor-updated firmware for 5 GHz");
50
51
52 struct ieee80211_channel_range {
53         short start_freq;
54         short end_freq;
55         unsigned char power_level;
56         unsigned char antenna_max;
57 };
58
59 static const struct ieee80211_channel_range ieee80211_fcc_channels[] = {
60         { 2412, 2462, 27, 6 } /* IEEE 802.11b/g, channels 1..11 */,
61         { 5180, 5240, 17, 6 } /* IEEE 802.11a, channels 36..48 */,
62         { 5260, 5320, 23, 6 } /* IEEE 802.11a, channels 52..64 */,
63         { 5745, 5825, 30, 6 } /* IEEE 802.11a, channels 149..165, outdoor */,
64         { 0 }
65 };
66
67 static const struct ieee80211_channel_range ieee80211_mkk_channels[] = {
68         { 2412, 2472, 20, 6 } /* IEEE 802.11b/g, channels 1..13 */,
69         { 5170, 5240, 20, 6 } /* IEEE 802.11a, channels 34..48 */,
70         { 5260, 5320, 20, 6 } /* IEEE 802.11a, channels 52..64 */,
71         { 0 }
72 };
73
74
75 static const struct ieee80211_channel_range *channel_range =
76         ieee80211_fcc_channels;
77
78
79 static void ieee80211_unmask_channel(int mode, struct ieee80211_channel *chan)
80 {
81         int i;
82
83         chan->flag = 0;
84
85         if (ieee80211_regdom == 64 &&
86             (mode == MODE_ATHEROS_TURBO || mode == MODE_ATHEROS_TURBOG)) {
87                 /* Do not allow Turbo modes in Japan. */
88                 return;
89         }
90
91         for (i = 0; channel_range[i].start_freq; i++) {
92                 const struct ieee80211_channel_range *r = &channel_range[i];
93                 if (r->start_freq <= chan->freq && r->end_freq >= chan->freq) {
94                         if (ieee80211_regdom == 64 && !ieee80211_japan_5ghz &&
95                             chan->freq >= 5260 && chan->freq <= 5320) {
96                                 /*
97                                  * Skip new channels in Japan since the
98                                  * firmware was not marked having been upgraded
99                                  * by the vendor.
100                                  */
101                                 continue;
102                         }
103
104                         if (ieee80211_regdom == 0x10 &&
105                             (chan->freq == 5190 || chan->freq == 5210 ||
106                              chan->freq == 5230)) {
107                                     /* Skip MKK channels when in FCC domain. */
108                                     continue;
109                         }
110
111                         chan->flag |= IEEE80211_CHAN_W_SCAN |
112                                 IEEE80211_CHAN_W_ACTIVE_SCAN |
113                                 IEEE80211_CHAN_W_IBSS;
114                         chan->power_level = r->power_level;
115                         chan->antenna_max = r->antenna_max;
116
117                         if (ieee80211_regdom == 64 &&
118                             (chan->freq == 5170 || chan->freq == 5190 ||
119                              chan->freq == 5210 || chan->freq == 5230)) {
120                                 /*
121                                  * New regulatory rules in Japan have backwards
122                                  * compatibility with old channels in 5.15-5.25
123                                  * GHz band, but the station is not allowed to
124                                  * use active scan on these old channels.
125                                  */
126                                 chan->flag &= ~IEEE80211_CHAN_W_ACTIVE_SCAN;
127                         }
128
129                         if (ieee80211_regdom == 64 &&
130                             (chan->freq == 5260 || chan->freq == 5280 ||
131                              chan->freq == 5300 || chan->freq == 5320)) {
132                                 /*
133                                  * IBSS is not allowed on 5.25-5.35 GHz band
134                                  * due to radar detection requirements.
135                                  */
136                                 chan->flag &= ~IEEE80211_CHAN_W_IBSS;
137                         }
138
139                         break;
140                 }
141         }
142 }
143
144
145 void ieee80211_set_default_regdomain(struct ieee80211_hw_mode *mode)
146 {
147         int c;
148         for (c = 0; c < mode->num_channels; c++)
149                 ieee80211_unmask_channel(mode->mode, &mode->channels[c]);
150 }
151
152
153 void ieee80211_regdomain_init(void)
154 {
155         if (ieee80211_regdom == 0x40)
156                 channel_range = ieee80211_mkk_channels;
157 }
158