[PATCH v3 1/3] driver_nl80211: Propagate probe-resp offload caps from kernel

[Arik Nemtsov]

Translate nl80211 flags to wpa_supplicant flags for probe-resp
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-off-by: Guy Eilam <guy at wizery.com>
Signed-off-by: Arik Nemtsov <arik at wizery.com>
---
v1->3:
- add 802.11u to supported protocols bitmap

src/drivers/driver.h         |   16 ++++++++++++++++
 src/drivers/driver_nl80211.c |   27 +++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 0 deletions(-)

diff --git a/src/drivers/driver.h b/src/drivers/driver.h
index 06f2db3..2500c1e 100644
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -751,6 +751,8 @@ 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;
@@ -768,6 +770,20 @@ struct wpa_driver_capa {
 	 * supports in AP mode
 	 */
 	unsigned int max_stations;
+
+	/**
+	 * probe_resp_offload_supp_protocols - 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_SUPPORT_WPS	0x00000001
+/* Driver probe response offloading support for WPS ver. 2 */
+#define WPA_DRIVER_PROBE_RESP_OFFLOAD_SUPPORT_WPS2	0x00000002
+/* Driver probe response offloading support for P2P */
+#define WPA_DRIVER_PROBE_RESP_OFFLOAD_SUPPORT_P2P	0x00000004
+/* Driver probe response offloading support for 802.11u (interworking) */
+#define WPA_DRIVER_PROBE_RESP_OFFLOAD_SUPPORT_80211U	0x00000008
+	unsigned int probe_resp_offload_protocols;
 };
 
 
diff --git a/src/drivers/driver_nl80211.c b/src/drivers/driver_nl80211.c
index 2ab10ae..1e66c72 100644
--- a/src/drivers/driver_nl80211.c
+++ b/src/drivers/driver_nl80211.c
@@ -1880,6 +1880,23 @@ 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_SUPPORT_WPS;
+	if (supp_protocols & NL80211_PROBE_RESP_OFFLOAD_SUPPORT_WPS2)
+		prot |= WPA_DRIVER_PROBE_RESP_OFFLOAD_SUPPORT_WPS2;
+	if (supp_protocols & NL80211_PROBE_RESP_OFFLOAD_SUPPORT_P2P)
+		prot |= WPA_DRIVER_PROBE_RESP_OFFLOAD_SUPPORT_P2P;
+	if (supp_protocols & NL80211_PROBE_RESP_OFFLOAD_SUPPORT_80211U)
+		prot |= WPA_DRIVER_PROBE_RESP_OFFLOAD_SUPPORT_80211U;
+
+	return prot;
+}
+
+
 static int wiphy_info_handler(struct nl_msg *msg, void *arg)
 {
 	struct nlattr *tb[NL80211_ATTR_MAX + 1];
@@ -2058,6 +2075,16 @@ broken_combination:
 		}
 	}
 
+	if (tb[NL80211_ATTR_PROBE_RESP_OFFLOAD_SUPPORT]) {
+		int protocols =
+			nla_get_u32(tb[NL80211_ATTR_PROBE_RESP_OFFLOAD_SUPPORT]);
+		wpa_printf(MSG_DEBUG, "nl80211: Supports probe-resp offload "
+			   "in AP-mode");
+		capa->flags |= WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD;
+		capa->probe_resp_offload_protocols =
+					probe_resp_offload_support(protocols);
+	}
+
 	return NL_SKIP;
 }
 
-- 
1.7.5.4