2008-01-24 18:38:38 +00:00
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/*
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* Wireless utility functions
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*
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2009-04-20 12:31:42 +00:00
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* Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
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2008-01-24 18:38:38 +00:00
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*/
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2009-04-20 12:31:42 +00:00
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#include <linux/bitops.h>
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#include <net/cfg80211.h>
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2008-01-24 18:38:38 +00:00
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#include "core.h"
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2008-10-29 19:00:45 +00:00
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struct ieee80211_rate *
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ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
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2009-01-21 14:13:48 +00:00
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u32 basic_rates, int bitrate)
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2008-10-29 19:00:45 +00:00
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{
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struct ieee80211_rate *result = &sband->bitrates[0];
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int i;
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for (i = 0; i < sband->n_bitrates; i++) {
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if (!(basic_rates & BIT(i)))
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continue;
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if (sband->bitrates[i].bitrate > bitrate)
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continue;
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result = &sband->bitrates[i];
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}
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return result;
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}
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EXPORT_SYMBOL(ieee80211_get_response_rate);
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2008-01-24 18:38:38 +00:00
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int ieee80211_channel_to_frequency(int chan)
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{
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if (chan < 14)
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return 2407 + chan * 5;
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if (chan == 14)
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return 2484;
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/* FIXME: 802.11j 17.3.8.3.2 */
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return (chan + 1000) * 5;
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}
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EXPORT_SYMBOL(ieee80211_channel_to_frequency);
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int ieee80211_frequency_to_channel(int freq)
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{
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if (freq == 2484)
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return 14;
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if (freq < 2484)
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return (freq - 2407) / 5;
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/* FIXME: 802.11j 17.3.8.3.2 */
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return freq/5 - 1000;
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}
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EXPORT_SYMBOL(ieee80211_frequency_to_channel);
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2008-03-26 13:14:55 +00:00
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struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
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int freq)
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2008-03-16 17:34:33 +00:00
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{
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enum ieee80211_band band;
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struct ieee80211_supported_band *sband;
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int i;
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for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
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sband = wiphy->bands[band];
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if (!sband)
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continue;
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for (i = 0; i < sband->n_channels; i++) {
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if (sband->channels[i].center_freq == freq)
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return &sband->channels[i];
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}
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}
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return NULL;
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}
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2008-03-26 13:14:55 +00:00
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EXPORT_SYMBOL(__ieee80211_get_channel);
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2008-03-16 17:34:33 +00:00
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2008-01-24 18:38:38 +00:00
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static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
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enum ieee80211_band band)
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{
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int i, want;
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switch (band) {
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case IEEE80211_BAND_5GHZ:
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want = 3;
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for (i = 0; i < sband->n_bitrates; i++) {
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if (sband->bitrates[i].bitrate == 60 ||
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sband->bitrates[i].bitrate == 120 ||
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sband->bitrates[i].bitrate == 240) {
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sband->bitrates[i].flags |=
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IEEE80211_RATE_MANDATORY_A;
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want--;
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}
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}
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WARN_ON(want);
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break;
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case IEEE80211_BAND_2GHZ:
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want = 7;
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for (i = 0; i < sband->n_bitrates; i++) {
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if (sband->bitrates[i].bitrate == 10) {
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sband->bitrates[i].flags |=
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IEEE80211_RATE_MANDATORY_B |
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IEEE80211_RATE_MANDATORY_G;
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want--;
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}
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if (sband->bitrates[i].bitrate == 20 ||
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sband->bitrates[i].bitrate == 55 ||
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sband->bitrates[i].bitrate == 110 ||
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sband->bitrates[i].bitrate == 60 ||
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sband->bitrates[i].bitrate == 120 ||
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sband->bitrates[i].bitrate == 240) {
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sband->bitrates[i].flags |=
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IEEE80211_RATE_MANDATORY_G;
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want--;
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}
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2008-01-30 16:36:10 +00:00
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if (sband->bitrates[i].bitrate != 10 &&
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sband->bitrates[i].bitrate != 20 &&
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sband->bitrates[i].bitrate != 55 &&
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sband->bitrates[i].bitrate != 110)
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2008-01-24 18:38:38 +00:00
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sband->bitrates[i].flags |=
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IEEE80211_RATE_ERP_G;
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}
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2008-02-02 22:53:10 +00:00
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WARN_ON(want != 0 && want != 3 && want != 6);
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2008-01-24 18:38:38 +00:00
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break;
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case IEEE80211_NUM_BANDS:
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WARN_ON(1);
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break;
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}
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}
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void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
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{
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enum ieee80211_band band;
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for (band = 0; band < IEEE80211_NUM_BANDS; band++)
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if (wiphy->bands[band])
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set_mandatory_flags_band(wiphy->bands[band], band);
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}
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2009-05-11 11:54:58 +00:00
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int cfg80211_validate_key_settings(struct key_params *params, int key_idx,
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const u8 *mac_addr)
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{
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if (key_idx > 5)
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return -EINVAL;
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/*
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* Disallow pairwise keys with non-zero index unless it's WEP
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* (because current deployments use pairwise WEP keys with
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* non-zero indizes but 802.11i clearly specifies to use zero)
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*/
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if (mac_addr && key_idx &&
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params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
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params->cipher != WLAN_CIPHER_SUITE_WEP104)
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return -EINVAL;
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/* TODO: add definitions for the lengths to linux/ieee80211.h */
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switch (params->cipher) {
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case WLAN_CIPHER_SUITE_WEP40:
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if (params->key_len != 5)
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return -EINVAL;
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break;
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case WLAN_CIPHER_SUITE_TKIP:
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if (params->key_len != 32)
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return -EINVAL;
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break;
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case WLAN_CIPHER_SUITE_CCMP:
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if (params->key_len != 16)
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return -EINVAL;
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break;
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case WLAN_CIPHER_SUITE_WEP104:
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if (params->key_len != 13)
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return -EINVAL;
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break;
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case WLAN_CIPHER_SUITE_AES_CMAC:
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if (params->key_len != 16)
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return -EINVAL;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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