P2P: Do not reply to 802.11b-only Probe Request frames as GO

If AP mode SME/MLME within wpa_supplicant is used for processing Probe
Request frames in GO mode, drop Probe Request frames that include only
802.11b rates per P2P spec section 2.4.1.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>

src/ap/beacon.c

@@ -485,6 +485,17 @@ void handle_probe_req(struct hostapd_data *hapd,
 	}
 #endif /* CONFIG_INTERWORKING */
 
+#ifdef CONFIG_P2P
+	if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
+	    supp_rates_11b_only(&elems)) {
+		/* Indicates support for 11b rates only */
+		wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
+			   MACSTR " with only 802.11b rates",
+			   MAC2STR(mgmt->sa));
+		return;
+	}
+#endif /* CONFIG_P2P */
+
 	/* TODO: verify that supp_rates contains at least one matching rate
 	 * with AP configuration */
 

src/common/ieee802_11_common.c

@@ -512,3 +512,36 @@ enum hostapd_hw_mode ieee80211_freq_to_chan(int freq, u8 *channel)
 
 	return mode;
 }
+
+
+static int is_11b(u8 rate)
+{
+	return rate == 0x02 || rate == 0x04 || rate == 0x0b || rate == 0x16;
+}
+
+
+int supp_rates_11b_only(struct ieee802_11_elems *elems)
+{
+	int num_11b = 0, num_others = 0;
+	int i;
+
+	if (elems->supp_rates == NULL && elems->ext_supp_rates == NULL)
+		return 0;
+
+	for (i = 0; elems->supp_rates && i < elems->supp_rates_len; i++) {
+		if (is_11b(elems->supp_rates[i]))
+			num_11b++;
+		else
+			num_others++;
+	}
+
+	for (i = 0; elems->ext_supp_rates && i < elems->ext_supp_rates_len;
+	     i++) {
+		if (is_11b(elems->ext_supp_rates[i]))
+			num_11b++;
+		else
+			num_others++;
+	}
+
+	return num_11b > 0 && num_others == 0;
+}

src/common/ieee802_11_common.h

@@ -101,4 +101,6 @@ int hostapd_config_wmm_ac(struct hostapd_wmm_ac_params wmm_ac_params[],
 			  const char *name, const char *val);
 enum hostapd_hw_mode ieee80211_freq_to_chan(int freq, u8 *channel);
 
+int supp_rates_11b_only(struct ieee802_11_elems *elems);
+
 #endif /* IEEE802_11_COMMON_H */

src/p2p/p2p.c

@@ -1899,39 +1899,6 @@ struct wpabuf * p2p_build_probe_resp_ies(struct p2p_data *p2p)
 }
 
 
-static int is_11b(u8 rate)
-{
-	return rate == 0x02 || rate == 0x04 || rate == 0x0b || rate == 0x16;
-}
-
-
-static int supp_rates_11b_only(struct ieee802_11_elems *elems)
-{
-	int num_11b = 0, num_others = 0;
-	int i;
-
-	if (elems->supp_rates == NULL && elems->ext_supp_rates == NULL)
-		return 0;
-
-	for (i = 0; elems->supp_rates && i < elems->supp_rates_len; i++) {
-		if (is_11b(elems->supp_rates[i]))
-			num_11b++;
-		else
-			num_others++;
-	}
-
-	for (i = 0; elems->ext_supp_rates && i < elems->ext_supp_rates_len;
-	     i++) {
-		if (is_11b(elems->ext_supp_rates[i]))
-			num_11b++;
-		else
-			num_others++;
-	}
-
-	return num_11b > 0 && num_others == 0;
-}
-
-
 static enum p2p_probe_req_status
 p2p_reply_probe(struct p2p_data *p2p, const u8 *addr, const u8 *dst,
 		const u8 *bssid, const u8 *ie, size_t ie_len)