Schedule a DPD timeout job that enforces the IKE message timeout policy

src/libcharon/Makefile.am

@@ -119,6 +119,7 @@ sa/ikev1/tasks/xauth.c sa/ikev1/tasks/xauth.h \
 sa/ikev1/tasks/quick_mode.c sa/ikev1/tasks/quick_mode.h \
 sa/ikev1/tasks/quick_delete.c sa/ikev1/tasks/quick_delete.h \
 sa/ikev1/tasks/mode_config.c sa/ikev1/tasks/mode_config.h \
+processing/jobs/dpd_timeout_job.c processing/jobs/dpd_timeout_job.h \
 processing/jobs/adopt_children_job.c processing/jobs/adopt_children_job.h
 endif
 

src/libcharon/processing/jobs/dpd_timeout_job.c

@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2012 Martin Willi
+ * Copyright (C) 2012 revosec AG
+ *
+ * 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 <stdlib.h>
+
+#include "dpd_timeout_job.h"
+
+#include <sa/ike_sa.h>
+#include <daemon.h>
+
+
+typedef struct private_dpd_timeout_job_t private_dpd_timeout_job_t;
+
+/**
+ * Private data
+ */
+struct private_dpd_timeout_job_t {
+
+	/**
+	 * public dpd_timeout_job_t interface
+	 */
+	dpd_timeout_job_t public;
+
+	/**
+	 * IKE_SA identifier
+	 */
+	ike_sa_id_t *ike_sa_id;
+
+	/**
+	 * Timestamp of first DPD check
+	 */
+	u_int32_t check;
+};
+
+METHOD(job_t, destroy, void,
+	private_dpd_timeout_job_t *this)
+{
+	this->ike_sa_id->destroy(this->ike_sa_id);
+	free(this);
+}
+
+METHOD(job_t, execute, void,
+	private_dpd_timeout_job_t *this)
+{
+	ike_sa_t *ike_sa;
+
+	ike_sa = charon->ike_sa_manager->checkout(charon->ike_sa_manager,
+											  this->ike_sa_id);
+	if (ike_sa)
+	{
+		/* check if no incoming packet during timeout, reestalish SA */
+		if (ike_sa->get_statistic(ike_sa, STAT_INBOUND) < this->check)
+		{
+			DBG1(DBG_JOB, "DPD check timed out, enforcing DPD action");
+			if (ike_sa->reestablish(ike_sa) == SUCCESS)
+			{
+				charon->ike_sa_manager->checkin_and_destroy(
+											charon->ike_sa_manager, ike_sa);
+			}
+			else
+			{
+				charon->ike_sa_manager->checkin(charon->ike_sa_manager, ike_sa);
+			}
+		}
+		else
+		{
+			charon->ike_sa_manager->checkin(charon->ike_sa_manager, ike_sa);
+		}
+	}
+	destroy(this);
+}
+
+METHOD(job_t, get_priority, job_priority_t,
+	private_dpd_timeout_job_t *this)
+{
+	return JOB_PRIO_HIGH;
+}
+
+/*
+ * Described in header
+ */
+dpd_timeout_job_t *dpd_timeout_job_create(ike_sa_id_t *ike_sa_id)
+{
+	private_dpd_timeout_job_t *this;
+
+	INIT(this,
+		.public = {
+			.job_interface = {
+				.execute = _execute,
+				.get_priority = _get_priority,
+				.destroy = _destroy,
+			},
+		},
+		.ike_sa_id = ike_sa_id->clone(ike_sa_id),
+		.check = time_monotonic(NULL),
+	);
+
+	return &this->public;
+}

src/libcharon/processing/jobs/dpd_timeout_job.h

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2012 Martin Willi
+ * Copyright (C) 2012 revosec AG
+ *
+ * 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.
+ */
+
+/**
+ * @defgroup dpd_timeout_job dpd_timeout_job
+ * @{ @ingroup cjobs
+ */
+
+#ifndef DPD_TIMEOUT_JOB_H_
+#define DPD_TIMEOUT_JOB_H_
+
+typedef struct dpd_timeout_job_t dpd_timeout_job_t;
+
+#include <library.h>
+#include <processing/jobs/job.h>
+#include <sa/ike_sa_id.h>
+
+/**
+ * Job enforcing DPD timeout.
+ *
+ * This job detects if a DPD response has been received during the DPD timeout
+ * interval, and if not, enforced the DPD action.
+ */
+struct dpd_timeout_job_t {
+
+	/**
+	 * implements job_t interface
+	 */
+	job_t job_interface;
+};
+
+/**
+ * Creates a DPD timeout job.
+ *
+ * @param ike_sa_id		ike_sa_id_t, gets cloned
+ * @return				initiate_ike_sa_job_t object
+ */
+dpd_timeout_job_t *dpd_timeout_job_create(ike_sa_id_t *ike_sa_id);
+
+#endif /** DPD_TIMEOUT_JOB_H_ @}*/

src/libcharon/sa/ikev1/task_manager_v1.c

@@ -35,6 +35,7 @@
 
 #include <processing/jobs/retransmit_job.h>
 #include <processing/jobs/delete_ike_sa_job.h>
+#include <processing/jobs/dpd_timeout_job.h>
 
 /**
  * Number of old messages hashes we keep for retransmission.
@@ -1358,8 +1359,20 @@ METHOD(task_manager_t, queue_child_delete, void,
 METHOD(task_manager_t, queue_dpd, void,
 	private_task_manager_t *this)
 {
+	u_int32_t t = 0, retransmit;
+
 	queue_task(this, (task_t*)isakmp_dpd_create(this->ike_sa, TRUE,
 												this->dpd_send++));
+
+	/* schedule DPD timeout job using the same timeout as a retransmitting
+	 * IKE message would have. */
+	for (retransmit = 0; retransmit <= this->retransmit_tries; retransmit++)
+	{
+		t += (u_int32_t)(this->retransmit_timeout * 1000.0 *
+						pow(this->retransmit_base, retransmit));
+	}
+	lib->scheduler->schedule_job_ms(lib->scheduler,
+		(job_t*)dpd_timeout_job_create(this->ike_sa->get_id(this->ike_sa)), t);
 }
 
 METHOD(task_manager_t, adopt_tasks, void,