From 7045defbffb2917279b3b8222b700fed4d7af925 Mon Sep 17 00:00:00 2001
From: Tobias Brunner <tobias@strongswan.org>
Date: Sat, 15 Jun 2013 14:21:34 +0200
Subject: kernel-libipsec: Use separate class to route packets between charon,
 libipsec and TUN device

---
 .../kernel_libipsec/kernel_libipsec_router.c       | 128 +++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 src/libcharon/plugins/kernel_libipsec/kernel_libipsec_router.c

(limited to 'src/libcharon/plugins/kernel_libipsec/kernel_libipsec_router.c')

diff --git a/src/libcharon/plugins/kernel_libipsec/kernel_libipsec_router.c b/src/libcharon/plugins/kernel_libipsec/kernel_libipsec_router.c
new file mode 100644
index 000000000..9a829f965
--- /dev/null
+++ b/src/libcharon/plugins/kernel_libipsec/kernel_libipsec_router.c
@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2013 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "kernel_libipsec_router.h"
+
+#include <daemon.h>
+#include <ipsec.h>
+#include <networking/tun_device.h>
+#include <processing/jobs/callback_job.h>
+
+typedef struct private_kernel_libipsec_router_t private_kernel_libipsec_router_t;
+
+/**
+ * Private data
+ */
+struct private_kernel_libipsec_router_t {
+
+	/**
+	 * Public interface
+	 */
+	kernel_libipsec_router_t public;
+
+	/**
+	 * TUN device
+	 */
+	tun_device_t *tun;
+};
+
+/**
+ * Outbound callback
+ */
+static void send_esp(void *data, esp_packet_t *packet)
+{
+	charon->sender->send_no_marker(charon->sender, (packet_t*)packet);
+}
+
+/**
+ * Receiver callback
+ */
+static void receiver_esp_cb(void *data, packet_t *packet)
+{
+	ipsec->processor->queue_inbound(ipsec->processor,
+									esp_packet_create_from_packet(packet));
+}
+
+/**
+ * Inbound callback
+ */
+static void deliver_plain(private_kernel_libipsec_router_t *this,
+						  ip_packet_t *packet)
+{
+	this->tun->write_packet(this->tun, packet->get_encoding(packet));
+	packet->destroy(packet);
+}
+
+/**
+ * Job handling outbound plaintext packets
+ */
+static job_requeue_t handle_plain(private_kernel_libipsec_router_t *this)
+{
+	chunk_t raw;
+
+	if (this->tun->read_packet(this->tun, &raw))
+	{
+		ip_packet_t *packet;
+
+		packet = ip_packet_create(raw);
+		if (packet)
+		{
+			ipsec->processor->queue_outbound(ipsec->processor, packet);
+		}
+		else
+		{
+			DBG1(DBG_KNL, "invalid IP packet read from TUN device");
+		}
+	}
+	return JOB_REQUEUE_DIRECT;
+}
+
+METHOD(kernel_libipsec_router_t, destroy, void,
+	private_kernel_libipsec_router_t *this)
+{
+	charon->receiver->del_esp_cb(charon->receiver,
+								(receiver_esp_cb_t)receiver_esp_cb);
+	ipsec->processor->unregister_outbound(ipsec->processor,
+										 (ipsec_outbound_cb_t)send_esp);
+	ipsec->processor->unregister_inbound(ipsec->processor,
+										 (ipsec_inbound_cb_t)deliver_plain);
+	free(this);
+}
+
+/*
+ * See header file
+ */
+kernel_libipsec_router_t *kernel_libipsec_router_create(tun_device_t *tun)
+{
+	private_kernel_libipsec_router_t *this;
+
+	INIT(this,
+		.public = {
+			.destroy = _destroy,
+		},
+		.tun = lib->get(lib, "kernel-libipsec-tun"),
+	);
+
+	ipsec->processor->register_outbound(ipsec->processor, send_esp, NULL);
+	ipsec->processor->register_inbound(ipsec->processor,
+									(ipsec_inbound_cb_t)deliver_plain, this);
+	charon->receiver->add_esp_cb(charon->receiver,
+									(receiver_esp_cb_t)receiver_esp_cb, NULL);
+	lib->processor->queue_job(lib->processor,
+			(job_t*)callback_job_create((callback_job_cb_t)handle_plain, this,
+									NULL, (callback_job_cancel_t)return_false));
+
+	return &this->public;
+}
-- 
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