cfg80211: Support multiple CSA counters

Change the type of NL80211_ATTR_CSA_C_OFF_BEACON and
NL80211_ATTR_CSA_C_OFF_PRESP to be NLA_BINARY which allows
userspace to use beacons and probe responses with
multiple CSA counters.
This isn't breaking the API since userspace can
continue to use nla_put_u16 for this attributes, which
is equivalent to a single element u16 array.
In addition advertise max number of supported CSA counters.
This is needed when using CSA and eCSA IEs together.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 15 insertions, 3 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index f46e1e15746d..447cb58f0d77 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -694,8 +694,10 @@ struct cfg80211_ap_settings {
  *
  * @chandef: defines the channel to use after the switch
  * @beacon_csa: beacon data while performing the switch
- * @counter_offset_beacon: offset for the counter within the beacon (tail)
- * @counter_offset_presp: offset for the counter within the probe response
+ * @counter_offsets_beacon: offsets of the counters within the beacon (tail)
+ * @counter_offsets_presp: offsets of the counters within the probe response
+ * @n_counter_offsets_beacon: number of csa counters the beacon (tail)
+ * @n_counter_offsets_presp: number of csa counters in the probe response
  * @beacon_after: beacon data to be used on the new channel
  * @radar_required: whether radar detection is required on the new channel
  * @block_tx: whether transmissions should be blocked while changing
@@ -704,7 +706,10 @@ struct cfg80211_ap_settings {
 struct cfg80211_csa_settings {
         struct cfg80211_chan_def chandef;
         struct cfg80211_beacon_data beacon_csa;
-        u16 counter_offset_beacon, counter_offset_presp;
+        const u16 *counter_offsets_beacon;
+        const u16 *counter_offsets_presp;
+        unsigned int n_counter_offsets_beacon;
+        unsigned int n_counter_offsets_presp;
         struct cfg80211_beacon_data beacon_after;
         bool radar_required;
         bool block_tx;
@@ -3048,6 +3053,13 @@ struct wiphy {
 
         u16 max_ap_assoc_sta;
 
+        /*
+         * Number of supported csa_counters in beacons and probe responses.
+         * This value should be set if the driver wishes to limit the number of
+         * csa counters. Default (0) means infinite.
+         */
+        u8 max_num_csa_counters;
+
         char priv[0] __aligned(NETDEV_ALIGN);
 };