[PATCH 16/18] Interworking: make sure interworking is supported before sending ANQP

[andrei.otcheretianski at intel.com]

From: David Spinadel <david.spinadel at intel.com>

Check that AP supports interworking before sending ANQP query.
While at it prevent sending GAS query to unknown BSSs.

Signed-off-by: David Spinadel <david.spinadel at intel.com>
---
 wpa_supplicant/hs20_supplicant.c |  6 ++++++
 wpa_supplicant/interworking.c    | 35 +++++++++++++++++++++++++++++++----
 wpa_supplicant/interworking.h    |  1 +
 3 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/wpa_supplicant/hs20_supplicant.c b/wpa_supplicant/hs20_supplicant.c
index e88f147..4a504a9 100644
--- a/wpa_supplicant/hs20_supplicant.c
+++ b/wpa_supplicant/hs20_supplicant.c
@@ -238,6 +238,12 @@ int hs20_anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst, u32 stypes,
 		return -1;
 	}
 
+	if (!interworking_supported_bss(bss)) {
+		wpa_printf(MSG_WARNING,
+			   "HS20: Cannot send query. AP does not support interworking");
+		return -1;
+	}
+
 	wpa_bss_anqp_unshare_alloc(bss);
 	freq = bss->freq;
 
diff --git a/wpa_supplicant/interworking.c b/wpa_supplicant/interworking.c
index 697810e..1585490 100644
--- a/wpa_supplicant/interworking.c
+++ b/wpa_supplicant/interworking.c
@@ -2691,6 +2691,18 @@ void interworking_stop_fetch_anqp(struct wpa_supplicant *wpa_s)
 }
 
 
+int interworking_supported_bss(const struct wpa_bss *bss)
+{
+	const u8 *ext_capab;
+
+	if (!bss)
+		return 0;
+
+	ext_capab = wpa_bss_get_ie(bss, WLAN_EID_EXT_CAPAB);
+	return ext_capab && ext_capab[1] >= 4 && (ext_capab[5] & 0x80);
+}
+
+
 int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
 		  u16 info_ids[], size_t num_ids, u32 subtypes)
 {
@@ -2709,6 +2721,12 @@ int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
 		return -1;
 	}
 
+	if (!interworking_supported_bss(bss)) {
+		wpa_printf(MSG_WARNING,
+			   "ANQP: Cannot send query. AP does not support interworking");
+		return -1;
+	}
+
 	wpa_bss_anqp_unshare_alloc(bss);
 	freq = bss->freq;
 
@@ -3084,12 +3102,21 @@ int gas_send_request(struct wpa_supplicant *wpa_s, const u8 *dst,
 	size_t len;
 	u8 query_resp_len_limit = 0;
 
-	freq = wpa_s->assoc_freq;
 	bss = wpa_bss_get_bssid(wpa_s, dst);
-	if (bss)
-		freq = bss->freq;
-	if (freq <= 0)
+	if (!bss) {
+		wpa_msg(wpa_s, MSG_WARNING,
+			"GAS: Cannot send query to unknown BSS "
+			MACSTR, MAC2STR(dst));
 		return -1;
+	}
+
+	if (!interworking_supported_bss(bss)) {
+		wpa_msg(wpa_s, MSG_WARNING,
+			"GAS: Cannot send query. AP does not support interworking");
+		return -1;
+	}
+
+	freq = bss->freq;
 
 	wpa_msg(wpa_s, MSG_DEBUG, "GAS request to " MACSTR " (freq %d MHz)",
 		MAC2STR(dst), freq);
diff --git a/wpa_supplicant/interworking.h b/wpa_supplicant/interworking.h
index 3743dc0..8090cf7 100644
--- a/wpa_supplicant/interworking.h
+++ b/wpa_supplicant/interworking.h
@@ -32,5 +32,6 @@ int interworking_home_sp_cred(struct wpa_supplicant *wpa_s,
 			      struct wpabuf *domain_names);
 int domain_name_list_contains(struct wpabuf *domain_names,
 			      const char *domain, int exact_match);
+int interworking_supported_bss(const struct wpa_bss *bss);
 
 #endif /* INTERWORKING_H */
-- 
1.9.1