tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
37static int ieee80211_regdom = 0x10; /* FCC */
38module_param(ieee80211_regdom, int, 0444);
39MODULE_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 */
47static int ieee80211_japan_5ghz /* = 0 */;
48module_param(ieee80211_japan_5ghz, int, 0444);
49MODULE_PARM_DESC(ieee80211_japan_5ghz, "Vendor-updated firmware for 5 GHz");
50
51
52struct ieee80211_channel_range {
53 short start_freq;
54 short end_freq;
55 unsigned char power_level;
56 unsigned char antenna_max;
57};
58
59static 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
67static 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
75static const struct ieee80211_channel_range *channel_range =
76 ieee80211_fcc_channels;
77
78
79static 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
145void 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
153void ieee80211_regdomain_init(void)
154{
155 if (ieee80211_regdom == 0x40)
156 channel_range = ieee80211_mkk_channels;
157}
158