android: Repurpose android-net to simply handle connectivity events

Using the events by NetworkManager/ConnectivityManager to trigger roam events
instead of the events generated by the kernel-netlink plugin the noise level
is much lower.

src/frontends/android/jni/libandroidbridge/charonservice.c

@@ -1,7 +1,7 @@
 /*
+ * Copyright (C) 2012-2013 Tobias Brunner
  * Copyright (C) 2012 Giuliano Grassi
  * Copyright (C) 2012 Ralf Sager
- * Copyright (C) 2012 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
@@ -78,6 +78,11 @@ struct private_charonservice_t {
 	 */
 	network_manager_t *network_manager;
 
+	/**
+	 * Handle network events
+	 */
+	android_net_t *net_handler;
+
 	/**
 	 * CharonVpnService reference
 	 */
@@ -358,12 +363,14 @@ static bool charonservice_register(void *plugin, plugin_feature_t *feature,
 	private_charonservice_t *this = (private_charonservice_t*)charonservice;
 	if (reg)
 	{
+		this->net_handler = android_net_create();
 		lib->credmgr->add_set(lib->credmgr, &this->creds->set);
 		hydra->attributes->add_handler(hydra->attributes,
 									   &this->attr->handler);
 	}
 	else
 	{
+		this->net_handler->destroy(this->net_handler);
 		lib->credmgr->remove_set(lib->credmgr, &this->creds->set);
 		hydra->attributes->remove_handler(hydra->attributes,
 										  &this->attr->handler);
@@ -413,6 +420,10 @@ static void set_options(char *logfile)
 	/* don't install virtual IPs via kernel-netlink */
 	lib->settings->set_bool(lib->settings,
 					"charon.install_virtual_ip", FALSE);
+	/* kernel-netlink should not trigger roam events, we use Android's
+	 * ConnectivityManager for that, much less noise */
+	lib->settings->set_bool(lib->settings,
+					"charon.plugins.kernel-netlink.roam_events", FALSE);
 	/* ignore tun devices (it's mostly tun0 but it may already be taken, ignore
 	 * some others too) */
 	lib->settings->set_str(lib->settings,

src/frontends/android/jni/libandroidbridge/kernel/android_net.c

@@ -16,21 +16,20 @@
 
 #include "../charonservice.h"
 #include <hydra.h>
-#include <utils/debug.h>
 #include <processing/jobs/callback_job.h>
 #include <threading/mutex.h>
 
 /** delay before firing roam events (ms) */
 #define ROAM_DELAY 100
 
-typedef struct private_kernel_android_net_t private_kernel_android_net_t;
+typedef struct private_android_net_t private_android_net_t;
 
-struct private_kernel_android_net_t {
+struct private_android_net_t {
 
 	/**
 	 * Public kernel interface
 	 */
-	kernel_android_net_t public;
+	android_net_t public;
 
 	/**
 	 * Reference to NetworkManager object
@@ -62,7 +61,7 @@ static job_requeue_t roam_event()
 /**
  * Listen for connectivity change events and queue a roam event
  */
-static void connectivity_cb(private_kernel_android_net_t *this,
+static void connectivity_cb(private_android_net_t *this,
 							bool disconnected)
 {
 	timeval_t now;
@@ -84,30 +83,8 @@ static void connectivity_cb(private_kernel_android_net_t *this,
 	lib->scheduler->schedule_job_ms(lib->scheduler, job, ROAM_DELAY);
 }
 
-METHOD(kernel_net_t, get_source_addr, host_t*,
-	private_kernel_android_net_t *this, host_t *dest, host_t *src)
-{
-	return this->network_manager->get_local_address(this->network_manager,
-											dest->get_family(dest) == AF_INET);
-}
-
-METHOD(kernel_net_t, get_interface, bool,
-	private_kernel_android_net_t *this, host_t *host, char **name)
-{
-	return this->network_manager->get_interface(this->network_manager, host,
-												name);
-}
-
-METHOD(kernel_net_t, add_ip, status_t,
-	private_kernel_android_net_t *this, host_t *virtual_ip, int prefix,
-	char *iface)
-{
-	/* we get the IP from the IKE_SA once the CHILD_SA is established */
-	return SUCCESS;
-}
-
-METHOD(kernel_net_t, destroy, void,
-	private_kernel_android_net_t *this)
+METHOD(android_net_t, destroy, void,
+	private_android_net_t *this)
 {
 	this->network_manager->remove_connectivity_cb(this->network_manager,
 												 (void*)connectivity_cb);
@@ -118,23 +95,13 @@ METHOD(kernel_net_t, destroy, void,
 /*
  * Described in header.
  */
-kernel_android_net_t *kernel_android_net_create()
+android_net_t *android_net_create()
 {
-	private_kernel_android_net_t *this;
+	private_android_net_t *this;
 
 	INIT(this,
 		.public = {
-			.interface = {
-				.get_source_addr = _get_source_addr,
-				.get_nexthop = (void*)return_null,
-				.get_interface = _get_interface,
-				.create_address_enumerator = (void*)enumerator_create_empty,
-				.add_ip = _add_ip,
-				.del_ip = (void*)return_failed,
-				.add_route = (void*)return_failed,
-				.del_route = (void*)return_failed,
-				.destroy = _destroy,
-			},
+			.destroy = _destroy,
 		},
 		.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
 		.network_manager = charonservice->get_network_manager(charonservice),

src/frontends/android/jni/libandroidbridge/kernel/android_net.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012-2013 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
@@ -14,36 +14,33 @@
  */
 
 /**
- * @defgroup kernel_android_net kernel_android_net
+ * @defgroup android_net android_net
  * @{ @ingroup android_kernel
  */
 
-#ifndef KERNEL_ANDROID_NET_H_
-#define KERNEL_ANDROID_NET_H_
+#ifndef ANDROID_NET_H_
+#define ANDROID_NET_H_
 
 #include <library.h>
-#include <kernel/kernel_net.h>
 
-typedef struct kernel_android_net_t kernel_android_net_t;
+typedef struct android_net_t android_net_t;
 
 /**
- * Implementation of the kernel-net interface.  This currently consists of only
- * noops because a kernel_net_t implementation is required and we can't use
- * kernel_netlink_net_t at the moment.
+ * Handle connectivity events from NetworkManager
  */
-struct kernel_android_net_t {
+struct android_net_t {
 
 	/**
-	 * Implements kernel_net_t interface
+	 * Destroy an android_net_t instance.
 	 */
-	kernel_net_t interface;
+	void (*destroy)(android_net_t *this);
 };
 
 /**
- * Create a android net interface instance.
+ * Create an android_net_t instance.
  *
- * @return			kernel_android_net_t instance
+ * @return			android_net_t instance
  */
-kernel_android_net_t *kernel_android_net_create();
+android_net_t *android_net_create();
 
-#endif /** KERNEL_ANDROID_NET_H_ @}*/
+#endif /** ANDROID_NET_H_ @}*/