Cuttlefish Wifi: Add data ops in virt_wifi driver for scan data simulation

Bug: 139421123
Signed-off-by: lesl <lesl@google.com>
Change-Id: Ib686dffe23cc234937af7e383182834721f01d78

drivers/net/wireless/virt_wifi.c

@@ -18,6 +18,7 @@
 #include <net/rtnetlink.h>
 #include <linux/etherdevice.h>
 #include <linux/module.h>
+#include <net/virt_wifi.h>
 
 static struct wiphy *common_wiphy;
 
@@ -25,6 +26,7 @@ struct virt_wifi_wiphy_priv {
 	struct delayed_work scan_result;
 	struct cfg80211_scan_request *scan_request;
 	bool being_deleted;
+	struct virt_wifi_network_simulation *network_simulation;
 };
 
 static struct ieee80211_channel channel_2ghz = {
@@ -153,6 +155,9 @@ static int virt_wifi_scan(struct wiphy *wiphy,
 
 	priv->scan_request = request;
 	schedule_delayed_work(&priv->scan_result, HZ * 2);
+	if (priv->network_simulation &&
+	    priv->network_simulation->notify_scan_trigger)
+		priv->network_simulation->notify_scan_trigger(wiphy, request);
 
 	return 0;
 }
@@ -183,6 +188,12 @@ static void virt_wifi_scan_result(struct work_struct *work)
 					   DBM_TO_MBM(-50), GFP_KERNEL);
 	cfg80211_put_bss(wiphy, informed_bss);
 
+	if(priv->network_simulation &&
+	   priv->network_simulation->generate_virt_scan_result) {
+		if(priv->network_simulation->generate_virt_scan_result(wiphy))
+			wiphy_err(wiphy, "Fail to generater the simulated scan result.\n");
+	}
+
 	/* Schedules work which acquires and releases the rtnl lock. */
 	cfg80211_scan_done(priv->scan_request, &scan_info);
 	priv->scan_request = NULL;
@@ -370,6 +381,8 @@ static struct wiphy *virt_wifi_make_wiphy(void)
 	priv = wiphy_priv(wiphy);
 	priv->being_deleted = false;
 	priv->scan_request = NULL;
+	priv->network_simulation = NULL;
+
 	INIT_DELAYED_WORK(&priv->scan_result, virt_wifi_scan_result);
 
 	err = wiphy_register(wiphy);
@@ -385,7 +398,6 @@ static struct wiphy *virt_wifi_make_wiphy(void)
 static void virt_wifi_destroy_wiphy(struct wiphy *wiphy)
 {
 	struct virt_wifi_wiphy_priv *priv;
-
 	WARN(!wiphy, "%s called with null wiphy", __func__);
 	if (!wiphy)
 		return;
@@ -419,8 +431,13 @@ static netdev_tx_t virt_wifi_start_xmit(struct sk_buff *skb,
 static int virt_wifi_net_device_open(struct net_device *dev)
 {
 	struct virt_wifi_netdev_priv *priv = netdev_priv(dev);
-
+	struct virt_wifi_wiphy_priv *w_priv;
 	priv->is_up = true;
+	w_priv = wiphy_priv(dev->ieee80211_ptr->wiphy);
+	if(w_priv->network_simulation &&
+	   w_priv->network_simulation->notify_device_open)
+		w_priv->network_simulation->notify_device_open(dev);
+
 	return 0;
 }
 
@@ -440,6 +457,10 @@ static int virt_wifi_net_device_stop(struct net_device *dev)
 	virt_wifi_cancel_connect(dev);
 	netif_carrier_off(dev);
 
+	if (w_priv->network_simulation &&
+	    w_priv->network_simulation->notify_device_stop)
+		w_priv->network_simulation->notify_device_stop(dev);
+
 	return 0;
 }
 
@@ -624,6 +645,27 @@ static void __exit virt_wifi_cleanup_module(void)
 	virt_wifi_destroy_wiphy(common_wiphy);
 }
 
+int virt_wifi_register_network_simulation
+	(struct virt_wifi_network_simulation *ops)
+{
+	struct virt_wifi_wiphy_priv *priv = wiphy_priv(common_wiphy);
+	if (priv->network_simulation)
+		return -EEXIST;
+	priv->network_simulation = ops;
+	return 0;
+}
+EXPORT_SYMBOL(virt_wifi_register_network_simulation);
+
+int virt_wifi_unregister_network_simulation(void)
+{
+	struct virt_wifi_wiphy_priv *priv = wiphy_priv(common_wiphy);
+	if(!priv->network_simulation)
+		return -ENODATA;
+	priv->network_simulation = NULL;
+	return 0;
+}
+EXPORT_SYMBOL(virt_wifi_unregister_network_simulation);
+
 module_init(virt_wifi_init_module);
 module_exit(virt_wifi_cleanup_module);
 

include/net/virt_wifi.h

@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* include/net/virt_wifi.h
+ *
+ * Define the extension interface for the network data simulation
+ *
+ * Copyright (C) 2019 Google, Inc.
+ *
+ * Author: lesl@google.com
+ */
+#ifndef __VIRT_WIFI_H
+#define __VIRT_WIFI_H
+
+struct virt_wifi_network_simulation {
+	void (*notify_device_open)(struct net_device *dev);
+	void (*notify_device_stop)(struct net_device *dev);
+	void (*notify_scan_trigger)(struct wiphy *wiphy,
+				    struct cfg80211_scan_request *request);
+	int (*generate_virt_scan_result)(struct wiphy *wiphy);
+};
+
+int virt_wifi_register_network_simulation(
+	    struct virt_wifi_network_simulation *ops);
+int virt_wifi_unregister_network_simulation(void);
+#endif
+