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cfg80211: use DS or HT operation IEs to determine BSS channel

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Currently, mac80211 checks the DS params IE if present and
uses it for the (primary) BSS channel, instead of the one
that the frame was received on. This is particularly useful
in the 2.4 GHz band since a frame is often received on one
of the adjacent channels due to overlap.

Move this code to cfg80211 so other drivers also do this.

Additionally, on 5 GHz, in particular with some (possibly)
upcoming changes in 802.11ai and duplicate transmissions
when wider channels are used, something similar happens.
So if present, also use the (primary) channel information
contained in the HT operation IE.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg
2012-11-23 14:23:30 +01:00
parent 03ae834faa
commit 0172bb7507
2 changed files with 45 additions and 9 deletions
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9
net/mac80211/scan.c
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@@ -174,7 +174,6 @@ void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
u8 *elements;
struct ieee80211_channel *channel;
size_t baselen;
int freq;
bool beacon;
struct ieee802_11_elems elems;
@@ -209,13 +208,7 @@ void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
ieee802_11_parse_elems(elements, skb->len - baselen, &elems);
if (elems.ds_params && elems.ds_params_len == 1)
freq = ieee80211_channel_to_frequency(elems.ds_params[0],
rx_status->band);
else
freq = rx_status->freq;
channel = ieee80211_get_channel(local->hw.wiphy, freq);
channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
return;