add git checkout support
[openwrt/openwrt.git] / package / mac80211 / src / 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 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