P2P: Save group common frequencies

Once a P2P GO interface is configured, save the group common
frequencies, as this can be useful later for channel selection
considerations during channel switch, etc.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>

wpa_supplicant/p2p_supplicant.c

@@ -610,6 +610,10 @@ static int wpas_p2p_group_delete(struct wpa_supplicant *wpa_s,
 	os_free(wpa_s->go_params);
 	wpa_s->go_params = NULL;
 
+	os_free(wpa_s->p2p_group_common_freqs);
+	wpa_s->p2p_group_common_freqs = NULL;
+	wpa_s->p2p_group_common_freqs_num = 0;
+
 	wpa_s->waiting_presence_resp = 0;
 
 	wpa_printf(MSG_DEBUG, "P2P: Remove temporary group network");
@@ -1298,6 +1302,40 @@ static void wpas_p2p_add_psk_list(struct wpa_supplicant *wpa_s,
 }
 
 
+static void p2p_go_dump_common_freqs(struct wpa_supplicant *wpa_s)
+{
+	unsigned int i;
+
+	wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Common group frequencies (len=%u):",
+		wpa_s->p2p_group_common_freqs_num);
+
+	for (i = 0; i < wpa_s->p2p_group_common_freqs_num; i++)
+		wpa_dbg(wpa_s, MSG_DEBUG, "freq[%u]: %d",
+			i, wpa_s->p2p_group_common_freqs[i]);
+}
+
+
+static void p2p_go_save_group_common_freqs(struct wpa_supplicant *wpa_s,
+					   struct p2p_go_neg_results *params)
+{
+	unsigned int i, len = int_array_len(wpa_s->go_params->freq_list);
+
+	wpa_s->p2p_group_common_freqs_num = 0;
+	os_free(wpa_s->p2p_group_common_freqs);
+	wpa_s->p2p_group_common_freqs = os_calloc(len, sizeof(int));
+	if (!wpa_s->p2p_group_common_freqs)
+		return;
+
+	for (i = 0; i < len; i++) {
+		if (!wpa_s->go_params->freq_list[i])
+			break;
+		wpa_s->p2p_group_common_freqs[i] =
+			wpa_s->go_params->freq_list[i];
+	}
+	wpa_s->p2p_group_common_freqs_num = i;
+}
+
+
 static void p2p_go_configured(void *ctx, void *data)
 {
 	struct wpa_supplicant *wpa_s = ctx;
@@ -1305,6 +1343,9 @@ static void p2p_go_configured(void *ctx, void *data)
 	struct wpa_ssid *ssid;
 	int network_id = -1;
 
+	p2p_go_save_group_common_freqs(wpa_s, params);
+	p2p_go_dump_common_freqs(wpa_s);
+
 	ssid = wpa_s->current_ssid;
 	if (ssid && ssid->mode == WPAS_MODE_P2P_GO) {
 		wpa_printf(MSG_DEBUG, "P2P: Group setup without provisioning");
@@ -4153,6 +4194,10 @@ void wpas_p2p_deinit(struct wpa_supplicant *wpa_s)
 	wpabuf_free(wpa_s->p2p_oob_dev_pw);
 	wpa_s->p2p_oob_dev_pw = NULL;
 
+	os_free(wpa_s->p2p_group_common_freqs);
+	wpa_s->p2p_group_common_freqs = NULL;
+	wpa_s->p2p_group_common_freqs_num = 0;
+
 	/* TODO: remove group interface from the driver if this wpa_s instance
 	 * is on top of a P2P group interface */
 }

wpa_supplicant/wpa_supplicant_i.h

@@ -779,6 +779,10 @@ struct wpa_supplicant {
 					* formation */
 	u8 p2p_peer_oob_pubkey_hash[WPS_OOB_PUBKEY_HASH_LEN];
 	u8 p2p_ip_addr_info[3 * 4];
+
+	/* group common frequencies */
+	int *p2p_group_common_freqs;
+	unsigned int p2p_group_common_freqs_num;
 #endif /* CONFIG_P2P */
 
 	struct wpa_ssid *bgscan_ssid;