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Commit 40a11ca8 authored by Johannes Berg's avatar Johannes Berg
Browse files

mac80211: check if channels allow 80 MHz for VHT probe requests 



If there are no channels allowing 80 MHz to be used, then the
station isn't really VHT capable even if the driver and device
support it in general. In this case, exclude the VHT capability
IE from probe request frames.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent ea9eba6a

net/mac80211/util.c

+10 −1
Original line number Diff line number Diff line
@@ -1339,6 +1339,7 @@ static int ieee80211_build_preq_ies_band(struct ieee80211_local *local, 
	int ext_rates_len;

	int shift;

	u32 rate_flags;

	bool have_80mhz = false;



	*offset = 0;
@@ -1467,7 +1468,15 @@ static int ieee80211_build_preq_ies_band(struct ieee80211_local *local, 
		*offset = noffset;

	}



	if (sband->vht_cap.vht_supported) {

	/* Check if any channel in this sband supports at least 80 MHz */

	for (i = 0; i < sband->n_channels; i++) {

		if (!(sband->channels[i].flags & IEEE80211_CHAN_NO_80MHZ)) {

			have_80mhz = true;

			break;

		}

	}



	if (sband->vht_cap.vht_supported && have_80mhz) {

		if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))

			goto out_err;

		pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,