kernel-libipsec: Create a TUN device and use it to install virtual IPs

2 files changed, 40 insertions, 0 deletions

diff --git a/src/libcharon/plugins/kernel_libipsec/kernel_libipsec_ipsec.c b/src/libcharon/plugins/kernel_libipsec/kernel_libipsec_ipsec.c
index fdcbace51..c7fc56b71 100644
--- a/src/libcharon/plugins/kernel_libipsec/kernel_libipsec_ipsec.c
+++ b/src/libcharon/plugins/kernel_libipsec/kernel_libipsec_ipsec.c
@@ -17,6 +17,7 @@
 #include <library.h>
 #include <ipsec.h>
 #include <hydra.h>
+#include <networking/tun_device.h>
 #include <utils/debug.h>
 
 typedef struct private_kernel_libipsec_ipsec_t private_kernel_libipsec_ipsec_t;
@@ -32,6 +33,11 @@ struct private_kernel_libipsec_ipsec_t {
 	 * Listener for lifetime expire events
 	 */
 	ipsec_event_listener_t ipsec_listener;
+
+	/**
+	 * TUN device
+	 */
+	tun_device_t *tun;
 };
 
 /**
@@ -181,6 +187,7 @@ kernel_libipsec_ipsec_t *kernel_libipsec_ipsec_create()
 		.ipsec_listener = {
 			.expire = expire,
 		},
+		.tun = lib->get(lib, "kernel-libipsec-tun"),
 	);
 
 	ipsec->events->register_listener(ipsec->events, &this->ipsec_listener);
diff --git a/src/libcharon/plugins/kernel_libipsec/kernel_libipsec_plugin.c b/src/libcharon/plugins/kernel_libipsec/kernel_libipsec_plugin.c
index a20ee7b4b..9fa811d02 100644
--- a/src/libcharon/plugins/kernel_libipsec/kernel_libipsec_plugin.c
+++ b/src/libcharon/plugins/kernel_libipsec/kernel_libipsec_plugin.c
@@ -17,8 +17,11 @@
 #include "kernel_libipsec_ipsec.h"
 
 #include <ipsec.h>
+#include <networking/tun_device.h>
 #include <utils/debug.h>
 
+#define TUN_DEFAULT_MTU 1400
+
 typedef struct private_kernel_libipsec_plugin_t private_kernel_libipsec_plugin_t;
 
 /**
@@ -30,6 +33,12 @@ struct private_kernel_libipsec_plugin_t {
 	 * implements plugin interface
 	 */
 	kernel_libipsec_plugin_t public;
+
+	/**
+	 * TUN device created by this plugin
+	 */
+	tun_device_t *tun;
+
 };
 
 METHOD(plugin_t, get_name, char*,
@@ -52,6 +61,11 @@ METHOD(plugin_t, get_features, int,
 METHOD(plugin_t, destroy, void,
 	private_kernel_libipsec_plugin_t *this)
 {
+	if (this->tun)
+	{
+		lib->set(lib, "kernel-libipsec-tun", NULL);
+		this->tun->destroy(this->tun);
+	}
 	libipsec_deinit();
 	free(this);
 }
@@ -80,5 +94,24 @@ plugin_t *kernel_libipsec_plugin_create()
 		return NULL;
 	}
 
+	this->tun = tun_device_create("ipsec%d");
+	if (!this->tun)
+	{
+		DBG1(DBG_KNL, "failed to create TUN device");
+		destroy(this);
+		return NULL;
+	}
+	if (!this->tun->set_mtu(this->tun, TUN_DEFAULT_MTU) ||
+		!this->tun->up(this->tun))
+	{
+		DBG1(DBG_KNL, "failed to configure TUN device");
+		destroy(this);
+		return NULL;
+	}
+	lib->set(lib, "kernel-libipsec-tun", this->tun);
+
+	/* set TUN device as default to install VIPs */
+	lib->settings->set_str(lib->settings, "%s.install_virtual_ip_on",
+						   this->tun->get_name(this->tun), charon->name);
 	return &this->public.plugin;
 }