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mac80211: split hardware scan by band

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There's currently a very odd bug in mac80211 -- a
hardware scan that is done while the hardware is
really operating on 2.4 GHz will include CCK rates
in the probe request frame, even on 5 GHz (if the
driver uses the mac80211 IEs). Vice versa, if the
hardware is operating on 5 GHz the 2.4 GHz probe
requests will not include CCK rates even though
they should.

Fix this by splitting up cfg80211 scan requests by
band -- recalculating the IEs every time -- and
requesting only per-band scans from the driver.

Apparently this bug hasn't been a problem yet, but
it is imaginable that some older access points get
confused if confronted with such behaviour.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg
2009-10-27 20:59:55 +01:00
committed by John W. Linville
parent b59f04cbf8
commit 4d36ec5823
3 changed files with 80 additions and 32 deletions
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8
net/mac80211/util.c
View File

@ -872,13 +872,14 @@ void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
}
int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
const u8 *ie, size_t ie_len)
const u8 *ie, size_t ie_len,
enum ieee80211_band band)
{
struct ieee80211_supported_band *sband;
u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
int i;
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
sband = local->hw.wiphy->bands[band];
pos = buffer;
@ -966,7 +967,8 @@ void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
memcpy(pos, ssid, ssid_len);
pos += ssid_len;
skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len,
local->hw.conf.channel->band));
ieee80211_tx_skb(sdata, skb, 0);
}