nl80211: Propagate Probe Response offload capabilities from kernel

Translate nl80211 flags to wpa_supplicant flags for Probe Response
offload support. The existence of the nl80211 PROBE_RESP_OFFLOAD_SUPPORT
attribute means Probe Response offload is supported. The value of the
attribute is a bitmap of supported protocols.

Signed-hostap: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>

src/drivers/driver.h

@@ -759,6 +759,8 @@ struct wpa_driver_capa {
 #define WPA_DRIVER_FLAGS_TDLS_SUPPORT			0x00080000
 /* Driver requires external TDLS setup/teardown/discovery */
 #define WPA_DRIVER_FLAGS_TDLS_EXTERNAL_SETUP		0x00100000
+/* Driver indicates support for Probe Response offloading in AP mode */
+#define WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD		0x00200000
 	unsigned int flags;
 
 	int max_scan_ssids;
@@ -776,6 +778,20 @@ struct wpa_driver_capa {
 	 * supports in AP mode
 	 */
 	unsigned int max_stations;
+
+	/**
+	 * probe_resp_offloads - Bitmap of supported protocols by the driver
+	 * for Probe Response offloading.
+	 */
+/* Driver Probe Response offloading support for WPS ver. 1 */
+#define WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS		0x00000001
+/* Driver Probe Response offloading support for WPS ver. 2 */
+#define WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2		0x00000002
+/* Driver Probe Response offloading support for P2P */
+#define WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P		0x00000004
+/* Driver Probe Response offloading support for IEEE 802.11u (Interworking) */
+#define WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING	0x00000008
+	unsigned int probe_resp_offloads;
 };
 
 

src/drivers/driver_nl80211.c

@@ -2268,6 +2268,23 @@ struct wiphy_info_data {
 };
 
 
+static unsigned int probe_resp_offload_support(int supp_protocols)
+{
+	unsigned int prot = 0;
+
+	if (supp_protocols & NL80211_PROBE_RESP_OFFLOAD_SUPPORT_WPS)
+		prot |= WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS;
+	if (supp_protocols & NL80211_PROBE_RESP_OFFLOAD_SUPPORT_WPS2)
+		prot |= WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2;
+	if (supp_protocols & NL80211_PROBE_RESP_OFFLOAD_SUPPORT_P2P)
+		prot |= WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P;
+	if (supp_protocols & NL80211_PROBE_RESP_OFFLOAD_SUPPORT_80211U)
+		prot |= WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING;
+
+	return prot;
+}
+
+
 static int wiphy_info_handler(struct nl_msg *msg, void *arg)
 {
 	struct nlattr *tb[NL80211_ATTR_MAX + 1];
@@ -2459,6 +2476,16 @@ broken_combination:
 			info->data_tx_status = 1;
 	}
 
+	if (tb[NL80211_ATTR_PROBE_RESP_OFFLOAD]) {
+		int protocols =
+			nla_get_u32(tb[NL80211_ATTR_PROBE_RESP_OFFLOAD]);
+		wpa_printf(MSG_DEBUG, "nl80211: Supports Probe Response "
+			   "offload in AP mode");
+		capa->flags |= WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD;
+		capa->probe_resp_offloads =
+			probe_resp_offload_support(protocols);
+	}
+
 	return NL_SKIP;
 }