cfg80211: allow userspace to control supported rates in scan

Some P2P scans are not allowed to advertise
11b rates, but that is a rather special case
so instead of having that, allow userspace
to request the rate sets (per band) that are
advertised in scan probe request frames.

Since it's needed in two places now, factor
out some common code parsing a rate array.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 7ba71e42449e..e4da76c9e4d9 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -1014,6 +1014,11 @@ enum nl80211_commands {
  * @%NL80211_ATTR_REKEY_DATA: nested attribute containing the information
  *      necessary for GTK rekeying in the device, see &enum nl80211_rekey_data.
  *
+ * @NL80211_ATTR_SCAN_SUPP_RATES: rates per to be advertised as supported in scan,
+ *      nested array attribute containing an entry for each band, with the entry
+ *      being a list of supported rates as defined by IEEE 802.11 7.3.2.2 but
+ *      without the length restriction (at most %NL80211_MAX_SUPP_RATES).
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -1217,6 +1222,8 @@ enum nl80211_attrs {
         NL80211_ATTR_MAX_NUM_SCHED_SCAN_SSIDS,
         NL80211_ATTR_MAX_SCHED_SCAN_IE_LEN,
 
+        NL80211_ATTR_SCAN_SUPP_RATES,
+
         /* add attributes here, update the policy in nl80211.c */
 
         __NL80211_ATTR_AFTER_LAST,
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 930c783286fc..d17f47fc9e31 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -777,6 +777,7 @@ struct cfg80211_ssid {
  * @n_channels: total number of channels to scan
  * @ie: optional information element(s) to add into Probe Request or %NULL
  * @ie_len: length of ie in octets
+ * @rates: bitmap of rates to advertise for each band
  * @wiphy: the wiphy this was for
  * @dev: the interface
  * @aborted: (internal) scan request was notified as aborted
@@ -788,6 +789,8 @@ struct cfg80211_scan_request {
         const u8 *ie;
         size_t ie_len;
 
+        u32 rates[IEEE80211_NUM_BANDS];
+
         /* internal */
         struct wiphy *wiphy;
         struct net_device *dev;