From 53b954ee4a71e782d7dfcdeee5bf4695caeeb112 Mon Sep 17 00:00:00 2001 From: Eliad Peller Date: Thu, 24 Jul 2014 11:20:05 +0300 Subject: [PATCH] mac80211: disable 40MHz support in case of 20MHz AP If the AP only advertises support for 20MHz (in the ht operation ie), disable 40MHz and VHT. This can improve interoperability with APs that don't like stations exceeding their own advertised capabilities. Signed-off-by: Eliad Peller Signed-off-by: Emmanuel Grumbach Signed-off-by: Johannes Berg --- net/mac80211/mlme.c | 30 ++++++++++++++++++++++-------- 1 file changed, 22 insertions(+), 8 deletions(-) diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 0e8d59a0e17e..29fe91d6a094 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -149,6 +149,7 @@ static u32 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, struct ieee80211_supported_band *sband, struct ieee80211_channel *channel, + const struct ieee80211_ht_cap *ht_cap, const struct ieee80211_ht_operation *ht_oper, const struct ieee80211_vht_operation *vht_oper, struct cfg80211_chan_def *chandef, bool tracking) @@ -162,13 +163,19 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, chandef->center_freq1 = channel->center_freq; chandef->center_freq2 = 0; - if (!ht_oper || !sband->ht_cap.ht_supported) { + if (!ht_cap || !ht_oper || !sband->ht_cap.ht_supported) { ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; goto out; } chandef->width = NL80211_CHAN_WIDTH_20; + if (!(ht_cap->cap_info & + cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) { + ret = IEEE80211_STA_DISABLE_40MHZ | IEEE80211_STA_DISABLE_VHT; + goto out; + } + ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan, channel->band); /* check that channel matches the right operating channel */ @@ -328,6 +335,7 @@ out: static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, + const struct ieee80211_ht_cap *ht_cap, const struct ieee80211_ht_operation *ht_oper, const struct ieee80211_vht_operation *vht_oper, const u8 *bssid, u32 *changed) @@ -367,8 +375,9 @@ static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata, sband = local->hw.wiphy->bands[chan->band]; /* calculate new channel (type) based on HT/VHT operation IEs */ - flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper, - vht_oper, &chandef, true); + flags = ieee80211_determine_chantype(sdata, sband, chan, + ht_cap, ht_oper, vht_oper, + &chandef, true); /* * Downgrade the new channel if we associated with restricted @@ -3173,7 +3182,8 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, mutex_lock(&local->sta_mtx); sta = sta_info_get(sdata, bssid); - if (ieee80211_config_bw(sdata, sta, elems.ht_operation, + if (ieee80211_config_bw(sdata, sta, + elems.ht_cap_elem, elems.ht_operation, elems.vht_operation, bssid, &changed)) { mutex_unlock(&local->sta_mtx); ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, @@ -3807,6 +3817,7 @@ static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, { struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; + const struct ieee80211_ht_cap *ht_cap = NULL; const struct ieee80211_ht_operation *ht_oper = NULL; const struct ieee80211_vht_operation *vht_oper = NULL; struct ieee80211_supported_band *sband; @@ -3823,14 +3834,17 @@ static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && sband->ht_cap.ht_supported) { - const u8 *ht_oper_ie, *ht_cap; + const u8 *ht_oper_ie, *ht_cap_ie; ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION); if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) ht_oper = (void *)(ht_oper_ie + 2); - ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); - if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) { + ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); + if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) + ht_cap = (void *)(ht_cap_ie + 2); + + if (!ht_cap) { ifmgd->flags |= IEEE80211_STA_DISABLE_HT; ht_oper = NULL; } @@ -3861,7 +3875,7 @@ static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, ifmgd->flags |= ieee80211_determine_chantype(sdata, sband, cbss->channel, - ht_oper, vht_oper, + ht_cap, ht_oper, vht_oper, &chandef, false); sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss), -- 2.20.1