p2p: Handle GO Negotiation Response, send Confirmation

Parse the GO Negotiation Response frame and if no errors found send the
GO Negotiation Confirmation.  If that gets ACKed wait for the GO to set
up the group.

src/p2p.c

@@ -87,6 +87,12 @@ struct p2p_device {
 	uint8_t conn_addr[6];
 	uint16_t conn_password_id;
 
+	struct l_timeout *config_timeout;
+	unsigned long go_config_delay;
+	uint32_t go_oper_freq;
+	struct p2p_group_id_attr go_group_id;
+	uint8_t go_interface_addr[6];
+
 	bool enabled : 1;
 	bool have_roc_cookie : 1;
 };
@@ -293,6 +299,8 @@ static void p2p_connection_reset(struct p2p_device *dev)
 	l_dbus_property_changed(dbus_get_bus(), p2p_device_get_path(dev),
 				IWD_P2P_INTERFACE, "AvailableConnections");
 
+	l_timeout_remove(dev->config_timeout);
+
 	frame_watch_group_remove(dev->wdev_id, FRAME_GROUP_CONNECT);
 	frame_xchg_stop(dev->wdev_id);
 
@@ -389,6 +397,53 @@ static void p2p_scan_destroy(void *user_data)
 	dev->scan_id = 0;
 }
 
+static void p2p_start_client_provision(struct p2p_device *dev)
+{
+	char bssid_str[18];
+
+	memcpy(bssid_str, util_address_to_string(dev->go_interface_addr), 18);
+	l_debug("freq=%u ssid=%s group_addr=%s bssid=%s", dev->go_oper_freq,
+		dev->go_group_id.ssid,
+		util_address_to_string(dev->go_group_id.device_addr),
+		bssid_str);
+
+	/* TODO: start client provisioning */
+}
+
+static void p2p_config_timeout_destroy(void *user_data)
+{
+	struct p2p_device *dev = user_data;
+
+	dev->config_timeout = NULL;
+}
+
+static void p2p_config_timeout(struct l_timeout *timeout, void *user_data)
+{
+	struct p2p_device *dev = user_data;
+
+	l_timeout_remove(dev->config_timeout);
+
+	/* Ready to start WSC */
+	p2p_start_client_provision(dev);
+}
+
+/*
+ * Called by GO Negotiation Response and Confirmation receive handlers,
+ * in both cases the channel lists are required to be subsets of our
+ * own supported channels and the Operating Channel must appear in the
+ * channel list.
+ */
+static bool p2p_device_validate_channel_list(struct p2p_device *dev,
+				const struct p2p_channel_list_attr *attr,
+				const struct p2p_channel_attr *oper_channel)
+{
+	if (l_queue_isempty(attr->channel_entries))
+		return false;
+
+	/* TODO */
+	return true;
+}
+
 /*
  * It seems that sending more than about 42 channels in a frame's Channel
  * List attribute will baffle some devices enough that they will ignore
@@ -448,12 +503,151 @@ static void p2p_device_fill_channel_list(struct p2p_device *dev,
 	l_queue_push_tail(attr->channel_entries, channel_entry);
 }
 
+static void p2p_go_negotiation_confirm_done(int error, void *user_data)
+{
+	struct p2p_device *dev = user_data;
+
+	if (error) {
+		/* TODO: we should probably ignore the missing ACK error */
+		l_error("Sending the GO Negotiation Confirm failed: %s (%i)",
+			strerror(-error), -error);
+		p2p_connect_failed(dev);
+		return;
+	}
+
+	/*
+	 * Frame was ACKed.  For simplicity wait idly the maximum amount of
+	 * time indicated by the peer in the GO Negotiation Response's
+	 * Configuration Timeout attribute and start the provisioning phase.
+	 */
+	dev->config_timeout = l_timeout_create_ms(dev->go_config_delay,
+						p2p_config_timeout, dev,
+						p2p_config_timeout_destroy);
+}
+
 static bool p2p_go_negotiation_resp_cb(const struct mmpdu_header *mpdu,
 					const void *body, size_t body_len,
 					int rssi, struct p2p_device *dev)
 {
-	/* TODO: handle the GO Negotiation Response frame */
-	return false;
+	struct p2p_go_negotiation_resp resp_info;
+	struct p2p_go_negotiation_confirmation confirm_info = {};
+	uint8_t *confirm_body;
+	size_t confirm_len;
+	int r;
+	struct iovec iov[16];
+	int iov_len = 0;
+	enum scan_band band;
+	uint32_t frequency;
+
+	l_debug("");
+
+	if (!dev->conn_peer)
+		return true;
+
+	if (body_len < 8) {
+		l_error("GO Negotiation Response frame too short");
+		p2p_connect_failed(dev);
+		return true;
+	}
+
+	r = p2p_parse_go_negotiation_resp(body + 7, body_len - 7, &resp_info);
+	if (r < 0) {
+		l_error("GO Negotiation Response parse error %s (%i)",
+			strerror(-r), -r);
+		p2p_connect_failed(dev);
+		return true;
+	}
+
+	if (resp_info.dialog_token != 1) {
+		l_error("GO Negotiation Response dialog token doesn't match");
+		p2p_connect_failed(dev);
+		return true;
+	}
+
+	if (resp_info.status != P2P_STATUS_SUCCESS) {
+		l_error("GO Negotiation Response status %i", resp_info.status);
+		p2p_connect_failed(dev);
+		return true;
+	}
+
+	/*
+	 * 3.1.4.2: "The Tie breaker bit in a GO Negotiation Response frame
+	 * shall be toggled from the corresponding GO Negotiation Request
+	 * frame."
+	 */
+	if (!resp_info.go_tie_breaker) {
+		l_error("GO Negotiation Response tie breaker value wrong");
+
+		if (resp_info.go_intent == 0) {
+			/* Can't continue */
+			p2p_connect_failed(dev);
+			return true;
+		}
+	}
+
+	if (resp_info.capability.group_caps & P2P_GROUP_CAP_PERSISTENT_GROUP) {
+		l_error("Persistent groups not supported");
+		p2p_connect_failed(dev);
+		return true;
+	}
+
+	if (resp_info.device_password_id != dev->conn_password_id) {
+		l_error("GO Negotiation Response WSC device password ID wrong");
+		p2p_connect_failed(dev);
+		return true;
+	}
+
+	if (!p2p_device_validate_channel_list(dev, &resp_info.channel_list,
+						&resp_info.operating_channel))
+		return true;
+
+	band = scan_oper_class_to_band(
+			(const uint8_t *) resp_info.operating_channel.country,
+			resp_info.operating_channel.oper_class);
+	frequency = scan_channel_to_freq(
+					resp_info.operating_channel.channel_num,
+					band);
+	if (!frequency) {
+		l_error("Bad operating channel in GO Negotiation Response");
+		p2p_connect_failed(dev);
+		return true;
+	}
+
+	dev->go_config_delay = resp_info.config_timeout.go_config_timeout * 10;
+	dev->go_oper_freq = frequency;
+	memcpy(&dev->go_group_id, &resp_info.group_id,
+		sizeof(struct p2p_group_id_attr));
+	memcpy(dev->go_interface_addr, resp_info.intended_interface_addr, 6);
+
+	/* Build and send the GO Negotiation Confirmation */
+	confirm_info.dialog_token = resp_info.dialog_token;
+	confirm_info.status = P2P_STATUS_SUCCESS;
+	confirm_info.capability.device_caps = 0;	/* Reserved */
+	confirm_info.capability.group_caps = 0;		/* Reserved */
+	confirm_info.channel_list = resp_info.channel_list;
+	confirm_info.operating_channel = resp_info.operating_channel;
+
+	confirm_body = p2p_build_go_negotiation_confirmation(&confirm_info,
+								&confirm_len);
+	p2p_clear_go_negotiation_resp(&resp_info);
+
+	if (!confirm_body) {
+		p2p_connect_failed(dev);
+		return true;
+	}
+
+	iov[iov_len].iov_base = confirm_body;
+	iov[iov_len].iov_len = confirm_len;
+	iov_len++;
+
+	/* WFD and other service IEs go here */
+
+	iov[iov_len].iov_base = NULL;
+
+	p2p_peer_frame_xchg(dev->conn_peer, iov, dev->conn_peer->device_addr,
+				0, 0, 0, false, FRAME_GROUP_CONNECT,
+				p2p_go_negotiation_confirm_done, NULL);
+	return true;
 }
 
 static void p2p_go_negotiation_req_done(int error, void *user_data)