From 40a11ca83de91f6bb2306580e7732ad3d97f201a Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Mon, 24 Nov 2014 15:49:44 +0100 Subject: [PATCH] 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: Johannes Berg --- net/mac80211/util.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/net/mac80211/util.c b/net/mac80211/util.c index bb9664cb8831..974ebe70f5b0 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -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,