Commit | Line | Data |
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8318d78a JB |
1 | /* |
2 | * Wireless utility functions | |
3 | * | |
d3236553 | 4 | * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net> |
8318d78a | 5 | */ |
d3236553 JB |
6 | #include <linux/bitops.h> |
7 | #include <net/cfg80211.h> | |
8318d78a JB |
8 | #include "core.h" |
9 | ||
bd815252 JB |
10 | struct ieee80211_rate * |
11 | ieee80211_get_response_rate(struct ieee80211_supported_band *sband, | |
881d948c | 12 | u32 basic_rates, int bitrate) |
bd815252 JB |
13 | { |
14 | struct ieee80211_rate *result = &sband->bitrates[0]; | |
15 | int i; | |
16 | ||
17 | for (i = 0; i < sband->n_bitrates; i++) { | |
18 | if (!(basic_rates & BIT(i))) | |
19 | continue; | |
20 | if (sband->bitrates[i].bitrate > bitrate) | |
21 | continue; | |
22 | result = &sband->bitrates[i]; | |
23 | } | |
24 | ||
25 | return result; | |
26 | } | |
27 | EXPORT_SYMBOL(ieee80211_get_response_rate); | |
28 | ||
8318d78a JB |
29 | int ieee80211_channel_to_frequency(int chan) |
30 | { | |
31 | if (chan < 14) | |
32 | return 2407 + chan * 5; | |
33 | ||
34 | if (chan == 14) | |
35 | return 2484; | |
36 | ||
37 | /* FIXME: 802.11j 17.3.8.3.2 */ | |
38 | return (chan + 1000) * 5; | |
39 | } | |
40 | EXPORT_SYMBOL(ieee80211_channel_to_frequency); | |
41 | ||
42 | int ieee80211_frequency_to_channel(int freq) | |
43 | { | |
44 | if (freq == 2484) | |
45 | return 14; | |
46 | ||
47 | if (freq < 2484) | |
48 | return (freq - 2407) / 5; | |
49 | ||
50 | /* FIXME: 802.11j 17.3.8.3.2 */ | |
51 | return freq/5 - 1000; | |
52 | } | |
53 | EXPORT_SYMBOL(ieee80211_frequency_to_channel); | |
54 | ||
6c507cd0 JB |
55 | struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy, |
56 | int freq) | |
906c730a JB |
57 | { |
58 | enum ieee80211_band band; | |
59 | struct ieee80211_supported_band *sband; | |
60 | int i; | |
61 | ||
62 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
63 | sband = wiphy->bands[band]; | |
64 | ||
65 | if (!sband) | |
66 | continue; | |
67 | ||
68 | for (i = 0; i < sband->n_channels; i++) { | |
69 | if (sband->channels[i].center_freq == freq) | |
70 | return &sband->channels[i]; | |
71 | } | |
72 | } | |
73 | ||
74 | return NULL; | |
75 | } | |
6c507cd0 | 76 | EXPORT_SYMBOL(__ieee80211_get_channel); |
906c730a | 77 | |
8318d78a JB |
78 | static void set_mandatory_flags_band(struct ieee80211_supported_band *sband, |
79 | enum ieee80211_band band) | |
80 | { | |
81 | int i, want; | |
82 | ||
83 | switch (band) { | |
84 | case IEEE80211_BAND_5GHZ: | |
85 | want = 3; | |
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; | |
92 | want--; | |
93 | } | |
94 | } | |
95 | WARN_ON(want); | |
96 | break; | |
97 | case IEEE80211_BAND_2GHZ: | |
98 | want = 7; | |
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; | |
104 | want--; | |
105 | } | |
106 | ||
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; | |
115 | want--; | |
116 | } | |
117 | ||
aac09fbf JB |
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) | |
8318d78a JB |
122 | sband->bitrates[i].flags |= |
123 | IEEE80211_RATE_ERP_G; | |
124 | } | |
406f2388 | 125 | WARN_ON(want != 0 && want != 3 && want != 6); |
8318d78a JB |
126 | break; |
127 | case IEEE80211_NUM_BANDS: | |
128 | WARN_ON(1); | |
129 | break; | |
130 | } | |
131 | } | |
132 | ||
133 | void ieee80211_set_bitrate_flags(struct wiphy *wiphy) | |
134 | { | |
135 | enum ieee80211_band band; | |
136 | ||
137 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
138 | if (wiphy->bands[band]) | |
139 | set_mandatory_flags_band(wiphy->bands[band], band); | |
140 | } | |
08645126 JB |
141 | |
142 | int cfg80211_validate_key_settings(struct key_params *params, int key_idx, | |
143 | const u8 *mac_addr) | |
144 | { | |
145 | if (key_idx > 5) | |
146 | return -EINVAL; | |
147 | ||
148 | /* | |
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) | |
152 | */ | |
153 | if (mac_addr && key_idx && | |
154 | params->cipher != WLAN_CIPHER_SUITE_WEP40 && | |
155 | params->cipher != WLAN_CIPHER_SUITE_WEP104) | |
156 | return -EINVAL; | |
157 | ||
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) | |
162 | return -EINVAL; | |
163 | break; | |
164 | case WLAN_CIPHER_SUITE_TKIP: | |
165 | if (params->key_len != 32) | |
166 | return -EINVAL; | |
167 | break; | |
168 | case WLAN_CIPHER_SUITE_CCMP: | |
169 | if (params->key_len != 16) | |
170 | return -EINVAL; | |
171 | break; | |
172 | case WLAN_CIPHER_SUITE_WEP104: | |
173 | if (params->key_len != 13) | |
174 | return -EINVAL; | |
175 | break; | |
176 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
177 | if (params->key_len != 16) | |
178 | return -EINVAL; | |
179 | break; | |
180 | default: | |
181 | return -EINVAL; | |
182 | } | |
183 | ||
9f26a952 JM |
184 | if (params->seq) { |
185 | switch (params->cipher) { | |
186 | case WLAN_CIPHER_SUITE_WEP40: | |
187 | case WLAN_CIPHER_SUITE_WEP104: | |
188 | /* These ciphers do not use key sequence */ | |
189 | return -EINVAL; | |
190 | case WLAN_CIPHER_SUITE_TKIP: | |
191 | case WLAN_CIPHER_SUITE_CCMP: | |
192 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
193 | if (params->seq_len != 6) | |
194 | return -EINVAL; | |
195 | break; | |
196 | } | |
197 | } | |
198 | ||
08645126 JB |
199 | return 0; |
200 | } |