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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> | |
8b8857a3 | 35 | #include "ieee80211_i.h" |
fd8bacc9 DD |
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 | ||
fd8bacc9 DD |
85 | for (i = 0; channel_range[i].start_freq; i++) { |
86 | const struct ieee80211_channel_range *r = &channel_range[i]; | |
87 | if (r->start_freq <= chan->freq && r->end_freq >= chan->freq) { | |
88 | if (ieee80211_regdom == 64 && !ieee80211_japan_5ghz && | |
89 | chan->freq >= 5260 && chan->freq <= 5320) { | |
90 | /* | |
91 | * Skip new channels in Japan since the | |
92 | * firmware was not marked having been upgraded | |
93 | * by the vendor. | |
94 | */ | |
95 | continue; | |
96 | } | |
97 | ||
98 | if (ieee80211_regdom == 0x10 && | |
99 | (chan->freq == 5190 || chan->freq == 5210 || | |
100 | chan->freq == 5230)) { | |
101 | /* Skip MKK channels when in FCC domain. */ | |
102 | continue; | |
103 | } | |
104 | ||
105 | chan->flag |= IEEE80211_CHAN_W_SCAN | | |
106 | IEEE80211_CHAN_W_ACTIVE_SCAN | | |
107 | IEEE80211_CHAN_W_IBSS; | |
108 | chan->power_level = r->power_level; | |
109 | chan->antenna_max = r->antenna_max; | |
110 | ||
111 | if (ieee80211_regdom == 64 && | |
112 | (chan->freq == 5170 || chan->freq == 5190 || | |
113 | chan->freq == 5210 || chan->freq == 5230)) { | |
114 | /* | |
115 | * New regulatory rules in Japan have backwards | |
116 | * compatibility with old channels in 5.15-5.25 | |
117 | * GHz band, but the station is not allowed to | |
118 | * use active scan on these old channels. | |
119 | */ | |
120 | chan->flag &= ~IEEE80211_CHAN_W_ACTIVE_SCAN; | |
121 | } | |
122 | ||
123 | if (ieee80211_regdom == 64 && | |
124 | (chan->freq == 5260 || chan->freq == 5280 || | |
125 | chan->freq == 5300 || chan->freq == 5320)) { | |
126 | /* | |
127 | * IBSS is not allowed on 5.25-5.35 GHz band | |
128 | * due to radar detection requirements. | |
129 | */ | |
130 | chan->flag &= ~IEEE80211_CHAN_W_IBSS; | |
131 | } | |
132 | ||
133 | break; | |
134 | } | |
135 | } | |
136 | } | |
137 | ||
138 | ||
139 | void ieee80211_set_default_regdomain(struct ieee80211_hw_mode *mode) | |
140 | { | |
141 | int c; | |
142 | for (c = 0; c < mode->num_channels; c++) | |
143 | ieee80211_unmask_channel(mode->mode, &mode->channels[c]); | |
144 | } | |
145 | ||
146 | ||
147 | void ieee80211_regdomain_init(void) | |
148 | { | |
149 | if (ieee80211_regdom == 0x40) | |
150 | channel_range = ieee80211_mkk_channels; | |
151 | } | |
152 |