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/*
* Copyright (C) 2012-2013 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_plugin.h"
#include "kernel_libipsec_ipsec.h"
#include <daemon.h>
#include <ipsec.h>
#include <networking/tun_device.h>
#include <processing/jobs/callback_job.h>
#include <utils/debug.h>
#define TUN_DEFAULT_MTU 1400
typedef struct private_kernel_libipsec_plugin_t private_kernel_libipsec_plugin_t;
/**
* private data of "kernel" libipsec plugin
*/
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*,
private_kernel_libipsec_plugin_t *this)
{
return "kernel-libipsec";
}
/**
* Outbound callback
*/
static void send_esp(void *data, esp_packet_t *packet)
{
charon->sender->send_no_marker(charon->sender, (packet_t*)packet);
}
/**
* Inbound callback
*/
static void deliver_plain(private_kernel_libipsec_plugin_t *this,
ip_packet_t *packet)
{
this->tun->write_packet(this->tun, packet->get_encoding(packet));
packet->destroy(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));
}
/**
* Job handling outbound plaintext packets
*/
static job_requeue_t handle_plain(private_kernel_libipsec_plugin_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;
}
/**
* Initialize/deinitialize sender and receiver
*/
static bool packet_handler_cb(private_kernel_libipsec_plugin_t *this,
plugin_feature_t *feature, bool reg, void *arg)
{
if (reg)
{
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));
}
else
{
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);
}
return TRUE;
}
METHOD(plugin_t, get_features, int,
private_kernel_libipsec_plugin_t *this, plugin_feature_t *features[])
{
static plugin_feature_t f[] = {
PLUGIN_CALLBACK(kernel_ipsec_register, kernel_libipsec_ipsec_create),
PLUGIN_PROVIDE(CUSTOM, "kernel-ipsec"),
PLUGIN_CALLBACK((plugin_feature_callback_t)packet_handler_cb, NULL),
PLUGIN_PROVIDE(CUSTOM, "kernel-libipsec-handler"),
PLUGIN_DEPENDS(CUSTOM, "libcharon-receiver"),
};
*features = f;
return countof(f);
}
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);
}
/*
* see header file
*/
plugin_t *kernel_libipsec_plugin_create()
{
private_kernel_libipsec_plugin_t *this;
INIT(this,
.public = {
.plugin = {
.get_name = _get_name,
.get_features = _get_features,
.destroy = _destroy,
},
},
);
if (!libipsec_init())
{
DBG1(DBG_LIB, "initialization of libipsec failed");
destroy(this);
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;
}
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