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--- a/iw.h
+++ b/iw.h
@@ -146,7 +146,7 @@ void print_ht_capability(__u16 cap);
const char *iftype_name(enum nl80211_iftype iftype);
const char *command_name(enum nl80211_commands cmd);
-int ieee80211_channel_to_frequency(int chan);
+int ieee80211_channel_to_frequency(int chan, enum nl80211_band band);
int ieee80211_frequency_to_channel(int freq);
void print_ssid_escaped(const uint8_t len, const uint8_t *data);
--- a/phy.c
+++ b/phy.c
@@ -66,8 +66,12 @@ static int handle_freqchan(struct nl_msg
if (*end)
return 1;
- if (chan)
- freq = ieee80211_channel_to_frequency(freq);
+ if (chan) {
+ enum nl80211_band band;
+ band = freq <= 14 ? NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
+ freq = ieee80211_channel_to_frequency(freq, band);
+ }
+
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq);
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE, htval);
--- a/util.c
+++ b/util.c
@@ -248,31 +248,37 @@ const char *command_name(enum nl80211_co
return cmdbuf;
}
-int ieee80211_channel_to_frequency(int chan)
+int ieee80211_channel_to_frequency(int chan, enum nl80211_band band)
{
- if (chan < 14)
- return 2407 + chan * 5;
-
- if (chan == 14)
- return 2484;
-
- /* FIXME: dot11ChannelStartingFactor (802.11-2007 17.3.8.3.2) */
- return (chan + 1000) * 5;
+ /* see 802.11-2007 17.3.8.3.2 and Annex J
+ * there are overlapping channel numbers in 5GHz and 2GHz bands */
+ if (band == NL80211_BAND_5GHZ) {
+ if (chan >= 182 && chan <= 196)
+ return 4000 + chan * 5;
+ else
+ return 5000 + chan * 5;
+ } else { /* NL80211_BAND_2GHZ */
+ if (chan == 14)
+ return 2484;
+ else if (chan < 14)
+ return 2407 + chan * 5;
+ else
+ return 0; /* not supported */
+ }
}
int ieee80211_frequency_to_channel(int freq)
{
+ /* see 802.11-2007 17.3.8.3.2 and Annex J */
if (freq == 2484)
return 14;
-
- if (freq < 2484)
+ else if (freq < 2484)
return (freq - 2407) / 5;
-
- /* FIXME: dot11ChannelStartingFactor (802.11-2007 17.3.8.3.2) */
- if (freq < 45000)
- return freq/5 - 1000;
-
- if (freq >= 58320 && freq <= 64800)
+ else if (freq >= 4910 && freq <= 4980)
+ return (freq - 4000) / 5;
+ else if (freq < 45000)
+ return (freq - 5000) / 5;
+ else if (freq >= 58320 && freq <= 64800)
return (freq - 56160) / 2160;
return 0;
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