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

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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 <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2014-11-24 15:49:44 +01:00
parent ea9eba6a8b
commit 40a11ca83d
1 changed files with 10 additions and 1 deletions
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11
net/mac80211/util.c
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@ -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,