hostapd: Add support for OWE offload for STA/AP interface

The driver advertising OWE offload support would take care of
Diffie-Hellman Parameter element generation and processing part. The
driver would be responsible for OWE PMK generation in this case.

Avoid the Diffie-Hellman Parameter element handling in
wpa_supplicant/hostapd for drivers advertising OWE offload support. This
change is applicable only for drivers supporting 4-way handshake
offload.

Signed-off-by: Vinayak Yadawad <vinayak.yadawad@broadcom.com>

src/ap/drv_callbacks.c

@@ -260,6 +260,9 @@ int hostapd_notif_assoc(struct hostapd_data *hapd, const u8 *addr,
 	u16 reason = WLAN_REASON_UNSPECIFIED;
 	int status = WLAN_STATUS_SUCCESS;
 	const u8 *p2p_dev_addr = NULL;
+#ifdef CONFIG_OWE
+	struct hostapd_iface *iface = hapd->iface;
+#endif /* CONFIG_OWE */
 
 	if (addr == NULL) {
 		/*
@@ -772,6 +775,7 @@ skip_wpa_check:
 
 #ifdef CONFIG_OWE
 	if ((hapd->conf->wpa_key_mgmt & WPA_KEY_MGMT_OWE) &&
+	    !(iface->drv_flags & WPA_DRIVER_FLAGS2_OWE_OFFLOAD_AP) &&
 	    wpa_auth_sta_key_mgmt(sta->wpa_sm) == WPA_KEY_MGMT_OWE &&
 	    elems.owe_dh) {
 		u8 *npos;

src/drivers/driver.h

@@ -2296,6 +2296,10 @@ struct wpa_driver_capa {
 #define WPA_DRIVER_FLAGS2_SAE_OFFLOAD_STA	0x0000000000010000ULL
 /** Driver support AP_PSK authentication offload */
 #define WPA_DRIVER_FLAGS2_4WAY_HANDSHAKE_AP_PSK	0x0000000000020000ULL
+/** Driver supports OWE STA offload */
+#define WPA_DRIVER_FLAGS2_OWE_OFFLOAD_STA	0x0000000000040000ULL
+/** Driver supports OWE AP offload */
+#define WPA_DRIVER_FLAGS2_OWE_OFFLOAD_AP	0x0000000000080000ULL
 	u64 flags2;
 
 #define FULL_AP_CLIENT_STATE_SUPP(drv_flags) \

src/drivers/driver_nl80211_capa.c

@@ -709,6 +709,14 @@ static void wiphy_info_ext_feature_flags(struct wiphy_info_data *info,
 	if (ext_feature_isset(ext_features, len,
 			      NL80211_EXT_FEATURE_4WAY_HANDSHAKE_AP_PSK))
 		capa->flags2 |= WPA_DRIVER_FLAGS2_4WAY_HANDSHAKE_AP_PSK;
+
+	if (ext_feature_isset(ext_features, len,
+			      NL80211_EXT_FEATURE_OWE_OFFLOAD))
+		capa->flags2 |= WPA_DRIVER_FLAGS2_OWE_OFFLOAD_STA;
+
+	if (ext_feature_isset(ext_features, len,
+			      NL80211_EXT_FEATURE_OWE_OFFLOAD_AP))
+		capa->flags2 |= WPA_DRIVER_FLAGS2_OWE_OFFLOAD_AP;
 }
 
 

wpa_supplicant/events.c

@@ -3376,6 +3376,7 @@ static int wpa_supplicant_event_associnfo(struct wpa_supplicant *wpa_s,
 
 #ifdef CONFIG_OWE
 	if (wpa_s->key_mgmt == WPA_KEY_MGMT_OWE &&
+	    !(wpa_s->drv_flags & WPA_DRIVER_FLAGS2_OWE_OFFLOAD_STA) &&
 	    (!bssid_known ||
 	     owe_process_assoc_resp(wpa_s->wpa,
 				    wpa_s->valid_links ?

wpa_supplicant/wpa_supplicant.c

@@ -3616,7 +3616,8 @@ static u8 * wpas_populate_assoc_ies(
 	} else
 #endif /* CONFIG_TESTING_OPTIONS */
 	if (algs == WPA_AUTH_ALG_OPEN &&
-	    ssid->key_mgmt == WPA_KEY_MGMT_OWE) {
+	    ssid->key_mgmt == WPA_KEY_MGMT_OWE &&
+	    !(wpa_s->drv_flags & WPA_DRIVER_FLAGS2_OWE_OFFLOAD_STA)) {
 		struct wpabuf *owe_ie;
 		u16 group;