2 * Wireless utility functions
4 * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
6 #include <linux/bitops.h>
7 #include <net/cfg80211.h>
10 struct ieee80211_rate *
11 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
12 u32 basic_rates, int bitrate)
14 struct ieee80211_rate *result = &sband->bitrates[0];
17 for (i = 0; i < sband->n_bitrates; i++) {
18 if (!(basic_rates & BIT(i)))
20 if (sband->bitrates[i].bitrate > bitrate)
22 result = &sband->bitrates[i];
27 EXPORT_SYMBOL(ieee80211_get_response_rate);
29 int ieee80211_channel_to_frequency(int chan)
32 return 2407 + chan * 5;
37 /* FIXME: 802.11j 17.3.8.3.2 */
38 return (chan + 1000) * 5;
40 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
42 int ieee80211_frequency_to_channel(int freq)
48 return (freq - 2407) / 5;
50 /* FIXME: 802.11j 17.3.8.3.2 */
53 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
55 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
58 enum ieee80211_band band;
59 struct ieee80211_supported_band *sband;
62 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
63 sband = wiphy->bands[band];
68 for (i = 0; i < sband->n_channels; i++) {
69 if (sband->channels[i].center_freq == freq)
70 return &sband->channels[i];
76 EXPORT_SYMBOL(__ieee80211_get_channel);
78 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
79 enum ieee80211_band band)
84 case IEEE80211_BAND_5GHZ:
86 for (i = 0; i < sband->n_bitrates; i++) {
87 if (sband->bitrates[i].bitrate == 60 ||
88 sband->bitrates[i].bitrate == 120 ||
89 sband->bitrates[i].bitrate == 240) {
90 sband->bitrates[i].flags |=
91 IEEE80211_RATE_MANDATORY_A;
97 case IEEE80211_BAND_2GHZ:
99 for (i = 0; i < sband->n_bitrates; i++) {
100 if (sband->bitrates[i].bitrate == 10) {
101 sband->bitrates[i].flags |=
102 IEEE80211_RATE_MANDATORY_B |
103 IEEE80211_RATE_MANDATORY_G;
107 if (sband->bitrates[i].bitrate == 20 ||
108 sband->bitrates[i].bitrate == 55 ||
109 sband->bitrates[i].bitrate == 110 ||
110 sband->bitrates[i].bitrate == 60 ||
111 sband->bitrates[i].bitrate == 120 ||
112 sband->bitrates[i].bitrate == 240) {
113 sband->bitrates[i].flags |=
114 IEEE80211_RATE_MANDATORY_G;
118 if (sband->bitrates[i].bitrate != 10 &&
119 sband->bitrates[i].bitrate != 20 &&
120 sband->bitrates[i].bitrate != 55 &&
121 sband->bitrates[i].bitrate != 110)
122 sband->bitrates[i].flags |=
123 IEEE80211_RATE_ERP_G;
125 WARN_ON(want != 0 && want != 3 && want != 6);
127 case IEEE80211_NUM_BANDS:
133 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
135 enum ieee80211_band band;
137 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
138 if (wiphy->bands[band])
139 set_mandatory_flags_band(wiphy->bands[band], band);
142 int cfg80211_validate_key_settings(struct key_params *params, int key_idx,
149 * Disallow pairwise keys with non-zero index unless it's WEP
150 * (because current deployments use pairwise WEP keys with
151 * non-zero indizes but 802.11i clearly specifies to use zero)
153 if (mac_addr && key_idx &&
154 params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
155 params->cipher != WLAN_CIPHER_SUITE_WEP104)
158 /* TODO: add definitions for the lengths to linux/ieee80211.h */
159 switch (params->cipher) {
160 case WLAN_CIPHER_SUITE_WEP40:
161 if (params->key_len != 5)
164 case WLAN_CIPHER_SUITE_TKIP:
165 if (params->key_len != 32)
168 case WLAN_CIPHER_SUITE_CCMP:
169 if (params->key_len != 16)
172 case WLAN_CIPHER_SUITE_WEP104:
173 if (params->key_len != 13)
176 case WLAN_CIPHER_SUITE_AES_CMAC:
177 if (params->key_len != 16)