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