[svn-upgrade] new version strongswan (4.5.0)

6 files changed, 2947 insertions, 0 deletions

diff --git a/src/libhydra/plugins/kernel_pfkey/Makefile.am b/src/libhydra/plugins/kernel_pfkey/Makefile.am
new file mode 100644
index 000000000..1d1488a6b
--- /dev/null
+++ b/src/libhydra/plugins/kernel_pfkey/Makefile.am
@@ -0,0 +1,17 @@
+
+INCLUDES = -I${linux_headers} -I$(top_srcdir)/src/libstrongswan \
+	-I$(top_srcdir)/src/libhydra
+
+AM_CFLAGS = -rdynamic
+
+if MONOLITHIC
+noinst_LTLIBRARIES = libstrongswan-kernel-pfkey.la
+else
+plugin_LTLIBRARIES = libstrongswan-kernel-pfkey.la
+endif
+
+libstrongswan_kernel_pfkey_la_SOURCES = \
+	kernel_pfkey_plugin.h kernel_pfkey_plugin.c \
+	kernel_pfkey_ipsec.h kernel_pfkey_ipsec.c
+
+libstrongswan_kernel_pfkey_la_LDFLAGS = -module -avoid-version
diff --git a/src/libhydra/plugins/kernel_pfkey/Makefile.in b/src/libhydra/plugins/kernel_pfkey/Makefile.in
new file mode 100644
index 000000000..a98ae42d1
--- /dev/null
+++ b/src/libhydra/plugins/kernel_pfkey/Makefile.in
@@ -0,0 +1,606 @@
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+# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+# 2003, 2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation,
+# Inc.
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
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+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES)
+installdirs:
+	for dir in "$(DESTDIR)$(plugindir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	$(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	  install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	  `test -z '$(STRIP)' || \
+	    echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	clean-pluginLTLIBRARIES mostlyclean-am
+
+distclean: distclean-am
+	-rm -rf ./$(DEPDIR)
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am: install-pluginLTLIBRARIES
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -rf ./$(DEPDIR)
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-pluginLTLIBRARIES
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS all all-am check check-am clean clean-generic \
+	clean-libtool clean-noinstLTLIBRARIES clean-pluginLTLIBRARIES \
+	ctags distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-pluginLTLIBRARIES install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags uninstall uninstall-am \
+	uninstall-pluginLTLIBRARIES
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/libhydra/plugins/kernel_pfkey/kernel_pfkey_ipsec.c b/src/libhydra/plugins/kernel_pfkey/kernel_pfkey_ipsec.c
new file mode 100644
index 000000000..f5786447b
--- /dev/null
+++ b/src/libhydra/plugins/kernel_pfkey/kernel_pfkey_ipsec.c
@@ -0,0 +1,2178 @@
+/*
+ * Copyright (C) 2008-2010 Tobias Brunner
+ * Copyright (C) 2008 Andreas Steffen
+ * 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 <sys/types.h>
+#include <sys/socket.h>
+
+#ifdef __FreeBSD__
+#include <limits.h> /* for LONG_MAX */
+#endif
+
+#ifdef HAVE_NET_PFKEYV2_H
+#include <net/pfkeyv2.h>
+#else
+#include <stdint.h>
+#include <linux/pfkeyv2.h>
+#endif
+
+#ifdef SADB_X_EXT_NAT_T_TYPE
+#define HAVE_NATT
+#endif
+
+#ifdef HAVE_NETIPSEC_IPSEC_H
+#include <netipsec/ipsec.h>
+#elif defined(HAVE_NETINET6_IPSEC_H)
+#include <netinet6/ipsec.h>
+#else
+#include <linux/ipsec.h>
+#endif
+
+#ifdef HAVE_NATT
+#ifdef HAVE_LINUX_UDP_H
+#include <linux/udp.h>
+#else
+#include <netinet/udp.h>
+#endif /*HAVE_LINUX_UDP_H*/
+#endif /*HAVE_NATT*/
+
+#include <unistd.h>
+#include <time.h>
+#include <errno.h>
+
+#include "kernel_pfkey_ipsec.h"
+
+#include <hydra.h>
+#include <debug.h>
+#include <utils/host.h>
+#include <utils/linked_list.h>
+#include <threading/thread.h>
+#include <threading/mutex.h>
+#include <processing/jobs/callback_job.h>
+
+/** non linux specific */
+#ifndef IPPROTO_COMP
+#ifdef IPPROTO_IPCOMP
+#define IPPROTO_COMP IPPROTO_IPCOMP
+#endif
+#endif
+
+#ifndef SADB_X_AALG_SHA2_256HMAC
+#define SADB_X_AALG_SHA2_256HMAC SADB_X_AALG_SHA2_256
+#define SADB_X_AALG_SHA2_384HMAC SADB_X_AALG_SHA2_384
+#define SADB_X_AALG_SHA2_512HMAC SADB_X_AALG_SHA2_512
+#endif
+
+#ifndef SADB_X_EALG_AESCBC
+#define SADB_X_EALG_AESCBC SADB_X_EALG_AES
+#endif
+
+#ifndef SADB_X_EALG_CASTCBC
+#define SADB_X_EALG_CASTCBC SADB_X_EALG_CAST128CBC
+#endif
+
+#ifndef SOL_IP
+#define SOL_IP IPPROTO_IP
+#define SOL_IPV6 IPPROTO_IPV6
+#endif
+
+/** from linux/in.h */
+#ifndef IP_IPSEC_POLICY
+#define IP_IPSEC_POLICY 16
+#endif
+
+/** missing on uclibc */
+#ifndef IPV6_IPSEC_POLICY
+#define IPV6_IPSEC_POLICY 34
+#endif
+
+/** default priority of installed policies */
+#define PRIO_LOW 3000
+#define PRIO_HIGH 2000
+
+#ifdef __APPLE__
+/** from xnu/bsd/net/pfkeyv2.h */
+#define SADB_X_EXT_NATT 0x002
+	struct sadb_sa_2 {
+		struct sadb_sa	sa;
+		u_int16_t		sadb_sa_natt_port;
+		u_int16_t		sadb_reserved0;
+		u_int32_t		sadb_reserved1;
+	};
+#endif
+
+/** buffer size for PF_KEY messages */
+#define PFKEY_BUFFER_SIZE 4096
+
+/** PF_KEY messages are 64 bit aligned */
+#define PFKEY_ALIGNMENT 8
+/** aligns len to 64 bits */
+#define PFKEY_ALIGN(len) (((len) + PFKEY_ALIGNMENT - 1) & ~(PFKEY_ALIGNMENT - 1))
+/** calculates the properly padded length in 64 bit chunks */
+#define PFKEY_LEN(len) ((PFKEY_ALIGN(len) / PFKEY_ALIGNMENT))
+/** calculates user mode length i.e. in bytes */
+#define PFKEY_USER_LEN(len) ((len) * PFKEY_ALIGNMENT)
+
+/** given a PF_KEY message header and an extension this updates the length in the header */
+#define PFKEY_EXT_ADD(msg, ext) ((msg)->sadb_msg_len += ((struct sadb_ext*)ext)->sadb_ext_len)
+/** given a PF_KEY message header this returns a pointer to the next extension */
+#define PFKEY_EXT_ADD_NEXT(msg) ((struct sadb_ext*)(((char*)(msg)) + PFKEY_USER_LEN((msg)->sadb_msg_len)))
+/** copy an extension and append it to a PF_KEY message */
+#define PFKEY_EXT_COPY(msg, ext) (PFKEY_EXT_ADD(msg, memcpy(PFKEY_EXT_ADD_NEXT(msg), ext, PFKEY_USER_LEN(((struct sadb_ext*)ext)->sadb_ext_len))))
+/** given a PF_KEY extension this returns a pointer to the next extension */
+#define PFKEY_EXT_NEXT(ext) ((struct sadb_ext*)(((char*)(ext)) + PFKEY_USER_LEN(((struct sadb_ext*)ext)->sadb_ext_len)))
+/** given a PF_KEY extension this returns a pointer to the next extension also updates len (len in 64 bit words) */
+#define PFKEY_EXT_NEXT_LEN(ext,len) ((len) -= (ext)->sadb_ext_len, PFKEY_EXT_NEXT(ext))
+/** true if ext has a valid length and len is large enough to contain ext (assuming len in 64 bit words) */
+#define PFKEY_EXT_OK(ext,len) ((len) >= PFKEY_LEN(sizeof(struct sadb_ext)) && \
+				(ext)->sadb_ext_len >= PFKEY_LEN(sizeof(struct sadb_ext)) && \
+				(ext)->sadb_ext_len <= (len))
+
+typedef struct private_kernel_pfkey_ipsec_t private_kernel_pfkey_ipsec_t;
+
+/**
+ * Private variables and functions of kernel_pfkey class.
+ */
+struct private_kernel_pfkey_ipsec_t
+{
+	/**
+	 * Public part of the kernel_pfkey_t object.
+	 */
+	kernel_pfkey_ipsec_t public;
+
+	/**
+	 * mutex to lock access to various lists
+	 */
+	mutex_t *mutex;
+
+	/**
+	 * List of installed policies (policy_entry_t)
+	 */
+	linked_list_t *policies;
+
+	/**
+	 * whether to install routes along policies
+	 */
+	bool install_routes;
+
+	/**
+	 * job receiving PF_KEY events
+	 */
+	callback_job_t *job;
+
+	/**
+	 * mutex to lock access to the PF_KEY socket
+	 */
+	mutex_t *mutex_pfkey;
+
+	/**
+	 * PF_KEY socket to communicate with the kernel
+	 */
+	int socket;
+
+	/**
+	 * PF_KEY socket to receive acquire and expire events
+	 */
+	int socket_events;
+
+	/**
+	 * sequence number for messages sent to the kernel
+	 */
+	int seq;
+};
+
+typedef struct route_entry_t route_entry_t;
+
+/**
+ * installed routing entry
+ */
+struct route_entry_t {
+	/** Name of the interface the route is bound to */
+	char *if_name;
+
+	/** Source ip of the route */
+	host_t *src_ip;
+
+	/** gateway for this route */
+	host_t *gateway;
+
+	/** Destination net */
+	chunk_t dst_net;
+
+	/** Destination net prefixlen */
+	u_int8_t prefixlen;
+};
+
+/**
+ * destroy an route_entry_t object
+ */
+static void route_entry_destroy(route_entry_t *this)
+{
+	free(this->if_name);
+	DESTROY_IF(this->src_ip);
+	DESTROY_IF(this->gateway);
+	chunk_free(&this->dst_net);
+	free(this);
+}
+
+typedef struct policy_entry_t policy_entry_t;
+
+/**
+ * installed kernel policy.
+ */
+struct policy_entry_t {
+
+	/** reqid of this policy */
+	u_int32_t reqid;
+
+	/** index assigned by the kernel */
+	u_int32_t index;
+
+	/** direction of this policy: in, out, forward */
+	u_int8_t direction;
+
+	/** parameters of installed policy */
+	struct {
+		/** subnet and port */
+		host_t *net;
+		/** subnet mask */
+		u_int8_t mask;
+		/** protocol */
+		u_int8_t proto;
+	} src, dst;
+
+	/** associated route installed for this policy */
+	route_entry_t *route;
+
+	/** by how many CHILD_SA's this policy is used */
+	u_int refcount;
+};
+
+/**
+ * create a policy_entry_t object
+ */
+static policy_entry_t *create_policy_entry(traffic_selector_t *src_ts,
+		traffic_selector_t *dst_ts, policy_dir_t dir, u_int32_t reqid)
+{
+	policy_entry_t *policy = malloc_thing(policy_entry_t);
+	policy->reqid = reqid;
+	policy->index = 0;
+	policy->direction = dir;
+	policy->route = NULL;
+	policy->refcount = 0;
+
+	src_ts->to_subnet(src_ts, &policy->src.net, &policy->src.mask);
+	dst_ts->to_subnet(dst_ts, &policy->dst.net, &policy->dst.mask);
+
+	/* src or dest proto may be "any" (0), use more restrictive one */
+	policy->src.proto = max(src_ts->get_protocol(src_ts), dst_ts->get_protocol(dst_ts));
+	policy->src.proto = policy->src.proto ? policy->src.proto : IPSEC_PROTO_ANY;
+	policy->dst.proto = policy->src.proto;
+
+	return policy;
+}
+
+/**
+ * destroy a policy_entry_t object
+ */
+static void policy_entry_destroy(policy_entry_t *this)
+{
+	DESTROY_IF(this->src.net);
+	DESTROY_IF(this->dst.net);
+	if (this->route)
+	{
+		route_entry_destroy(this->route);
+	}
+	free(this);
+}
+
+/**
+ * compares two policy_entry_t
+ */
+static inline bool policy_entry_equals(policy_entry_t *current, policy_entry_t *policy)
+{
+	return current->direction == policy->direction &&
+		   current->src.proto == policy->src.proto &&
+		   current->dst.proto == policy->dst.proto &&
+		   current->src.mask == policy->src.mask &&
+		   current->dst.mask == policy->dst.mask &&
+		   current->src.net->equals(current->src.net, policy->src.net) &&
+		   current->dst.net->equals(current->dst.net, policy->dst.net);
+}
+
+/**
+ * compare the given kernel index with that of a policy
+ */
+static inline bool policy_entry_match_byindex(policy_entry_t *current, u_int32_t *index)
+{
+	return current->index == *index;
+}
+
+typedef struct pfkey_msg_t pfkey_msg_t;
+
+struct pfkey_msg_t
+{
+	/**
+	 * PF_KEY message base
+	 */
+	struct sadb_msg *msg;
+
+	/**
+	 * PF_KEY message extensions
+	 */
+	union {
+		struct sadb_ext *ext[SADB_EXT_MAX + 1];
+		struct {
+			struct sadb_ext *reserved;				/* SADB_EXT_RESERVED */
+			struct sadb_sa *sa;						/* SADB_EXT_SA */
+			struct sadb_lifetime *lft_current;		/* SADB_EXT_LIFETIME_CURRENT */
+			struct sadb_lifetime *lft_hard;			/* SADB_EXT_LIFETIME_HARD */
+			struct sadb_lifetime *lft_soft;			/* SADB_EXT_LIFETIME_SOFT */
+			struct sadb_address *src;				/* SADB_EXT_ADDRESS_SRC */
+			struct sadb_address *dst;				/* SADB_EXT_ADDRESS_DST */
+			struct sadb_address *proxy;				/* SADB_EXT_ADDRESS_PROXY */
+			struct sadb_key *key_auth;				/* SADB_EXT_KEY_AUTH */
+			struct sadb_key *key_encr;				/* SADB_EXT_KEY_ENCRYPT */
+			struct sadb_ident *id_src;				/* SADB_EXT_IDENTITY_SRC */
+			struct sadb_ident *id_dst;				/* SADB_EXT_IDENTITY_DST */
+			struct sadb_sens *sensitivity;			/* SADB_EXT_SENSITIVITY */
+			struct sadb_prop *proposal;				/* SADB_EXT_PROPOSAL */
+			struct sadb_supported *supported_auth;	/* SADB_EXT_SUPPORTED_AUTH */
+			struct sadb_supported *supported_encr;	/* SADB_EXT_SUPPORTED_ENCRYPT */
+			struct sadb_spirange *spirange;			/* SADB_EXT_SPIRANGE */
+			struct sadb_x_kmprivate *x_kmprivate;	/* SADB_X_EXT_KMPRIVATE */
+			struct sadb_x_policy *x_policy;			/* SADB_X_EXT_POLICY */
+			struct sadb_x_sa2 *x_sa2;				/* SADB_X_EXT_SA2 */
+			struct sadb_x_nat_t_type *x_natt_type;	/* SADB_X_EXT_NAT_T_TYPE */
+			struct sadb_x_nat_t_port *x_natt_sport;	/* SADB_X_EXT_NAT_T_SPORT */
+			struct sadb_x_nat_t_port *x_natt_dport;	/* SADB_X_EXT_NAT_T_DPORT */
+			struct sadb_address *x_natt_oa;			/* SADB_X_EXT_NAT_T_OA */
+			struct sadb_x_sec_ctx *x_sec_ctx;		/* SADB_X_EXT_SEC_CTX */
+			struct sadb_x_kmaddress *x_kmaddress;	/* SADB_X_EXT_KMADDRESS */
+		} __attribute__((__packed__));
+	};
+};
+
+ENUM(sadb_ext_type_names, SADB_EXT_RESERVED, SADB_EXT_MAX,
+	"SADB_EXT_RESERVED",
+	"SADB_EXT_SA",
+	"SADB_EXT_LIFETIME_CURRENT",
+	"SADB_EXT_LIFETIME_HARD",
+	"SADB_EXT_LIFETIME_SOFT",
+	"SADB_EXT_ADDRESS_SRC",
+	"SADB_EXT_ADDRESS_DST",
+	"SADB_EXT_ADDRESS_PROXY",
+	"SADB_EXT_KEY_AUTH",
+	"SADB_EXT_KEY_ENCRYPT",
+	"SADB_EXT_IDENTITY_SRC",
+	"SADB_EXT_IDENTITY_DST",
+	"SADB_EXT_SENSITIVITY",
+	"SADB_EXT_PROPOSAL",
+	"SADB_EXT_SUPPORTED_AUTH",
+	"SADB_EXT_SUPPORTED_ENCRYPT",
+	"SADB_EXT_SPIRANGE",
+	"SADB_X_EXT_KMPRIVATE",
+	"SADB_X_EXT_POLICY",
+	"SADB_X_EXT_SA2",
+	"SADB_X_EXT_NAT_T_TYPE",
+	"SADB_X_EXT_NAT_T_SPORT",
+	"SADB_X_EXT_NAT_T_DPORT",
+	"SADB_X_EXT_NAT_T_OA",
+	"SADB_X_EXT_SEC_CTX",
+	"SADB_X_EXT_KMADDRESS"
+);
+
+/**
+ * convert a protocol identifier to the PF_KEY sa type
+ */
+static u_int8_t proto2satype(u_int8_t proto)
+{
+	switch (proto)
+	{
+		case IPPROTO_ESP:
+			return SADB_SATYPE_ESP;
+		case IPPROTO_AH:
+			return SADB_SATYPE_AH;
+		case IPPROTO_COMP:
+			return SADB_X_SATYPE_IPCOMP;
+		default:
+			return proto;
+	}
+}
+
+/**
+ * convert a PF_KEY sa type to a protocol identifier
+ */
+static u_int8_t satype2proto(u_int8_t satype)
+{
+	switch (satype)
+	{
+		case SADB_SATYPE_ESP:
+			return IPPROTO_ESP;
+		case SADB_SATYPE_AH:
+			return IPPROTO_AH;
+		case SADB_X_SATYPE_IPCOMP:
+			return IPPROTO_COMP;
+		default:
+			return satype;
+	}
+}
+
+/**
+ * convert the general ipsec mode to the one defined in ipsec.h
+ */
+static u_int8_t mode2kernel(ipsec_mode_t mode)
+{
+	switch (mode)
+	{
+		case MODE_TRANSPORT:
+			return IPSEC_MODE_TRANSPORT;
+		case MODE_TUNNEL:
+			return IPSEC_MODE_TUNNEL;
+#ifdef HAVE_IPSEC_MODE_BEET
+		case MODE_BEET:
+			return IPSEC_MODE_BEET;
+#endif
+		default:
+			return mode;
+	}
+}
+
+/**
+ * convert the general policy direction to the one defined in ipsec.h
+ */
+static u_int8_t dir2kernel(policy_dir_t dir)
+{
+	switch (dir)
+	{
+		case POLICY_IN:
+			return IPSEC_DIR_INBOUND;
+		case POLICY_OUT:
+			return IPSEC_DIR_OUTBOUND;
+#ifdef HAVE_IPSEC_DIR_FWD
+		case POLICY_FWD:
+			return IPSEC_DIR_FWD;
+#endif
+		default:
+			return IPSEC_DIR_INVALID;
+	}
+}
+
+#ifdef SADB_X_MIGRATE
+/**
+ * convert the policy direction in ipsec.h to the general one.
+ */
+static policy_dir_t kernel2dir(u_int8_t  dir)
+{
+	switch (dir)
+	{
+		case IPSEC_DIR_INBOUND:
+			return POLICY_IN;
+		case IPSEC_DIR_OUTBOUND:
+			return POLICY_OUT;
+#ifdef HAVE_IPSEC_DIR_FWD
+		case IPSEC_DIR_FWD:
+			return POLICY_FWD;
+#endif
+		default:
+			return dir;
+	}
+}
+#endif /*SADB_X_MIGRATE*/
+
+typedef struct kernel_algorithm_t kernel_algorithm_t;
+
+/**
+ * Mapping of IKEv2 algorithms to PF_KEY algorithms
+ */
+struct kernel_algorithm_t {
+	/**
+	 * Identifier specified in IKEv2
+	 */
+	int ikev2;
+
+	/**
+	 * Identifier as defined in pfkeyv2.h
+	 */
+	int kernel;
+};
+
+#define END_OF_LIST -1
+
+/**
+ * Algorithms for encryption
+ */
+static kernel_algorithm_t encryption_algs[] = {
+/*	{ENCR_DES_IV64,				0							}, */
+	{ENCR_DES,					SADB_EALG_DESCBC			},
+	{ENCR_3DES,					SADB_EALG_3DESCBC			},
+/*	{ENCR_RC5,					0							}, */
+/*	{ENCR_IDEA,					0							}, */
+	{ENCR_CAST,					SADB_X_EALG_CASTCBC			},
+	{ENCR_BLOWFISH,				SADB_X_EALG_BLOWFISHCBC		},
+/*	{ENCR_3IDEA,				0							}, */
+/*	{ENCR_DES_IV32,				0							}, */
+	{ENCR_NULL,					SADB_EALG_NULL				},
+	{ENCR_AES_CBC,				SADB_X_EALG_AESCBC			},
+/*	{ENCR_AES_CTR,				SADB_X_EALG_AESCTR			}, */
+/*  {ENCR_AES_CCM_ICV8,			SADB_X_EALG_AES_CCM_ICV8	}, */
+/*	{ENCR_AES_CCM_ICV12,		SADB_X_EALG_AES_CCM_ICV12	}, */
+/*	{ENCR_AES_CCM_ICV16,		SADB_X_EALG_AES_CCM_ICV16	}, */
+/*	{ENCR_AES_GCM_ICV8,			SADB_X_EALG_AES_GCM_ICV8	}, */
+/*	{ENCR_AES_GCM_ICV12,		SADB_X_EALG_AES_GCM_ICV12	}, */
+/*	{ENCR_AES_GCM_ICV16,		SADB_X_EALG_AES_GCM_ICV16	}, */
+	{END_OF_LIST,				0							},
+};
+
+/**
+ * Algorithms for integrity protection
+ */
+static kernel_algorithm_t integrity_algs[] = {
+	{AUTH_HMAC_MD5_96,			SADB_AALG_MD5HMAC			},
+	{AUTH_HMAC_SHA1_96,			SADB_AALG_SHA1HMAC			},
+	{AUTH_HMAC_SHA2_256_128,	SADB_X_AALG_SHA2_256HMAC	},
+	{AUTH_HMAC_SHA2_384_192,	SADB_X_AALG_SHA2_384HMAC	},
+	{AUTH_HMAC_SHA2_512_256,	SADB_X_AALG_SHA2_512HMAC	},
+/*	{AUTH_DES_MAC,				0,							}, */
+/*	{AUTH_KPDK_MD5,				0,							}, */
+#ifdef SADB_X_AALG_AES_XCBC_MAC
+	{AUTH_AES_XCBC_96,			SADB_X_AALG_AES_XCBC_MAC,	},
+#endif
+	{END_OF_LIST,				0,							},
+};
+
+#if 0
+/**
+ * Algorithms for IPComp, unused yet
+ */
+static kernel_algorithm_t compression_algs[] = {
+/*	{IPCOMP_OUI,				0							}, */
+	{IPCOMP_DEFLATE,			SADB_X_CALG_DEFLATE			},
+	{IPCOMP_LZS,				SADB_X_CALG_LZS				},
+	{IPCOMP_LZJH,				SADB_X_CALG_LZJH			},
+	{END_OF_LIST,				0							},
+};
+#endif
+
+/**
+ * Look up a kernel algorithm ID and its key size
+ */
+static int lookup_algorithm(kernel_algorithm_t *list, int ikev2)
+{
+	while (list->ikev2 != END_OF_LIST)
+	{
+		if (ikev2 == list->ikev2)
+		{
+			return list->kernel;
+		}
+		list++;
+	}
+	return 0;
+}
+
+/**
+ * Copy a host_t as sockaddr_t to the given memory location. Ports are
+ * reset to zero as per RFC 2367.
+ * @return		the number of bytes copied
+ */
+static size_t hostcpy(void *dest, host_t *host)
+{
+	sockaddr_t *addr = host->get_sockaddr(host), *dest_addr = dest;
+	socklen_t *len = host->get_sockaddr_len(host);
+	memcpy(dest, addr, *len);
+#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
+	dest_addr->sa_len = *len;
+#endif
+	switch (dest_addr->sa_family)
+	{
+		case AF_INET:
+		{
+			struct sockaddr_in *sin = dest;
+			sin->sin_port = 0;
+			break;
+		}
+		case AF_INET6:
+		{
+			struct sockaddr_in6 *sin6 = dest;
+			sin6->sin6_port = 0;
+			break;
+		}
+	}
+	return *len;
+}
+
+/**
+ * add a host behind an sadb_address extension
+ */
+static void host2ext(host_t *host, struct sadb_address *ext)
+{
+	size_t len = hostcpy(ext + 1, host);
+	ext->sadb_address_len = PFKEY_LEN(sizeof(*ext) + len);
+}
+
+/**
+ * add a host to the given sadb_msg
+ */
+static void add_addr_ext(struct sadb_msg *msg, host_t *host, u_int16_t type,
+						 u_int8_t proto, u_int8_t prefixlen)
+{
+	struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg);
+	addr->sadb_address_exttype = type;
+	addr->sadb_address_proto = proto;
+	addr->sadb_address_prefixlen = prefixlen;
+	host2ext(host, addr);
+	PFKEY_EXT_ADD(msg, addr);
+}
+
+/**
+ * adds an empty address extension to the given sadb_msg
+ */
+static void add_anyaddr_ext(struct sadb_msg *msg, int family, u_int8_t type)
+{
+	socklen_t len = (family == AF_INET) ? sizeof(struct sockaddr_in) :
+										  sizeof(struct sockaddr_in6);
+	struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg);
+	addr->sadb_address_exttype = type;
+	sockaddr_t *saddr = (sockaddr_t*)(addr + 1);
+	saddr->sa_family = family;
+#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
+	saddr->sa_len = len;
+#endif
+	addr->sadb_address_len = PFKEY_LEN(sizeof(*addr) + len);
+	PFKEY_EXT_ADD(msg, addr);
+}
+
+#ifdef HAVE_NATT
+/**
+ * add udp encap extensions to a sadb_msg
+ */
+static void add_encap_ext(struct sadb_msg *msg, host_t *src, host_t *dst)
+{
+	struct sadb_x_nat_t_type* nat_type;
+	struct sadb_x_nat_t_port* nat_port;
+
+	nat_type = (struct sadb_x_nat_t_type*)PFKEY_EXT_ADD_NEXT(msg);
+	nat_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
+	nat_type->sadb_x_nat_t_type_len = PFKEY_LEN(sizeof(struct sadb_x_nat_t_type));
+	nat_type->sadb_x_nat_t_type_type = UDP_ENCAP_ESPINUDP;
+	PFKEY_EXT_ADD(msg, nat_type);
+
+	nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg);
+	nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
+	nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(struct sadb_x_nat_t_port));
+	nat_port->sadb_x_nat_t_port_port = htons(src->get_port(src));
+	PFKEY_EXT_ADD(msg, nat_port);
+
+	nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg);
+	nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
+	nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(struct sadb_x_nat_t_port));
+	nat_port->sadb_x_nat_t_port_port = htons(dst->get_port(dst));
+	PFKEY_EXT_ADD(msg, nat_port);
+}
+#endif /*HAVE_NATT*/
+
+/**
+ * Convert a sadb_address to a traffic_selector
+ */
+static traffic_selector_t* sadb_address2ts(struct sadb_address *address)
+{
+	traffic_selector_t *ts;
+	host_t *host;
+
+	/* The Linux 2.6 kernel does not set the protocol and port information
+	 * in the src and dst sadb_address extensions of the SADB_ACQUIRE message.
+	 */
+	host = host_create_from_sockaddr((sockaddr_t*)&address[1])	;
+	ts = traffic_selector_create_from_subnet(host, address->sadb_address_prefixlen,
+				address->sadb_address_proto, host->get_port(host));
+	return ts;
+}
+
+/**
+ * Parses a pfkey message received from the kernel
+ */
+static status_t parse_pfkey_message(struct sadb_msg *msg, pfkey_msg_t *out)
+{
+	struct sadb_ext* ext;
+	size_t len;
+
+	memset(out, 0, sizeof(pfkey_msg_t));
+	out->msg = msg;
+
+	len = msg->sadb_msg_len;
+	len -= PFKEY_LEN(sizeof(struct sadb_msg));
+
+	ext = (struct sadb_ext*)(((char*)msg) + sizeof(struct sadb_msg));
+
+	while (len >= PFKEY_LEN(sizeof(struct sadb_ext)))
+	{
+		DBG3(DBG_KNL, "  %N", sadb_ext_type_names, ext->sadb_ext_type);
+		if (ext->sadb_ext_len < PFKEY_LEN(sizeof(struct sadb_ext)) ||
+			ext->sadb_ext_len > len)
+		{
+			DBG1(DBG_KNL, "length of %N extension is invalid",
+						   sadb_ext_type_names, ext->sadb_ext_type);
+			break;
+		}
+
+		if ((ext->sadb_ext_type > SADB_EXT_MAX) || (!ext->sadb_ext_type))
+		{
+			DBG1(DBG_KNL, "type of PF_KEY extension (%d) is invalid", ext->sadb_ext_type);
+			break;
+		}
+
+		if (out->ext[ext->sadb_ext_type])
+		{
+			DBG1(DBG_KNL, "duplicate %N extension",
+						   sadb_ext_type_names, ext->sadb_ext_type);
+			break;
+		}
+
+		out->ext[ext->sadb_ext_type] = ext;
+		ext = PFKEY_EXT_NEXT_LEN(ext, len);
+	}
+
+	if (len)
+	{
+		DBG1(DBG_KNL, "PF_KEY message length is invalid");
+		return FAILED;
+	}
+
+	return SUCCESS;
+}
+
+/**
+ * Send a message to a specific PF_KEY socket and handle the response.
+ */
+static status_t pfkey_send_socket(private_kernel_pfkey_ipsec_t *this, int socket,
+					struct sadb_msg *in, struct sadb_msg **out, size_t *out_len)
+{
+	unsigned char buf[PFKEY_BUFFER_SIZE];
+	struct sadb_msg *msg;
+	int in_len, len;
+
+	this->mutex_pfkey->lock(this->mutex_pfkey);
+
+	/* FIXME: our usage of sequence numbers is probably wrong. check RFC 2367,
+	 * in particular the behavior in response to an SADB_ACQUIRE. */
+	in->sadb_msg_seq = ++this->seq;
+	in->sadb_msg_pid = getpid();
+
+	in_len = PFKEY_USER_LEN(in->sadb_msg_len);
+
+	while (TRUE)
+	{
+		len = send(socket, in, in_len, 0);
+
+		if (len != in_len)
+		{
+			if (errno == EINTR)
+			{
+				/* interrupted, try again */
+				continue;
+			}
+			this->mutex_pfkey->unlock(this->mutex_pfkey);
+			DBG1(DBG_KNL, "error sending to PF_KEY socket: %s", strerror(errno));
+			return FAILED;
+		}
+		break;
+	}
+
+	while (TRUE)
+	{
+		msg = (struct sadb_msg*)buf;
+
+		len = recv(socket, buf, sizeof(buf), 0);
+
+		if (len < 0)
+		{
+			if (errno == EINTR)
+			{
+				DBG1(DBG_KNL, "got interrupted");
+				/* interrupted, try again */
+				continue;
+			}
+			DBG1(DBG_KNL, "error reading from PF_KEY socket: %s", strerror(errno));
+			this->mutex_pfkey->unlock(this->mutex_pfkey);
+			return FAILED;
+		}
+		if (len < sizeof(struct sadb_msg) ||
+			msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg)))
+		{
+			DBG1(DBG_KNL, "received corrupted PF_KEY message");
+			this->mutex_pfkey->unlock(this->mutex_pfkey);
+			return FAILED;
+		}
+		if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT)
+		{
+			DBG1(DBG_KNL, "buffer was too small to receive the complete PF_KEY message");
+			this->mutex_pfkey->unlock(this->mutex_pfkey);
+			return FAILED;
+		}
+		if (msg->sadb_msg_pid != in->sadb_msg_pid)
+		{
+			DBG2(DBG_KNL, "received PF_KEY message is not intended for us");
+			continue;
+		}
+		if (msg->sadb_msg_seq != this->seq)
+		{
+			DBG1(DBG_KNL, "received PF_KEY message with unexpected sequence "
+				 "number, was %d expected %d", msg->sadb_msg_seq, this->seq);
+			if (msg->sadb_msg_seq == 0)
+			{
+				/* FreeBSD and Mac OS X do this for the response to
+				 * SADB_X_SPDGET (but not for the response to SADB_GET).
+				 * FreeBSD: 'key_spdget' in /usr/src/sys/netipsec/key.c. */
+			}
+			else if (msg->sadb_msg_seq < this->seq)
+			{
+				continue;
+			}
+			else
+			{
+				this->mutex_pfkey->unlock(this->mutex_pfkey);
+				return FAILED;
+			}
+		}
+		if (msg->sadb_msg_type != in->sadb_msg_type)
+		{
+			DBG2(DBG_KNL, "received PF_KEY message of wrong type, "
+					"was %d expected %d, ignoring",
+					msg->sadb_msg_type, in->sadb_msg_type);
+		}
+		break;
+	}
+
+	*out_len = len;
+	*out = (struct sadb_msg*)malloc(len);
+	memcpy(*out, buf, len);
+
+	this->mutex_pfkey->unlock(this->mutex_pfkey);
+
+	return SUCCESS;
+}
+
+/**
+ * Send a message to the default PF_KEY socket and handle the response.
+ */
+static status_t pfkey_send(private_kernel_pfkey_ipsec_t *this,
+					struct sadb_msg *in, struct sadb_msg **out, size_t *out_len)
+{
+	return pfkey_send_socket(this, this->socket, in, out, out_len);
+}
+
+/**
+ * Process a SADB_ACQUIRE message from the kernel
+ */
+static void process_acquire(private_kernel_pfkey_ipsec_t *this, struct sadb_msg* msg)
+{
+	pfkey_msg_t response;
+	u_int32_t index, reqid = 0;
+	traffic_selector_t *src_ts, *dst_ts;
+	policy_entry_t *policy;
+
+	switch (msg->sadb_msg_satype)
+	{
+		case SADB_SATYPE_UNSPEC:
+		case SADB_SATYPE_ESP:
+		case SADB_SATYPE_AH:
+			break;
+		default:
+			/* acquire for AH/ESP only */
+			return;
+	}
+	DBG2(DBG_KNL, "received an SADB_ACQUIRE");
+
+	if (parse_pfkey_message(msg, &response) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "parsing SADB_ACQUIRE from kernel failed");
+		return;
+	}
+
+	index = response.x_policy->sadb_x_policy_id;
+	this->mutex->lock(this->mutex);
+	if (this->policies->find_first(this->policies,
+			(linked_list_match_t)policy_entry_match_byindex, (void**)&policy, &index) == SUCCESS)
+	{
+		reqid = policy->reqid;
+	}
+	else
+	{
+		DBG1(DBG_KNL, "received an SADB_ACQUIRE with policy id %d but no"
+					  " matching policy found", index);
+	}
+	src_ts = sadb_address2ts(response.src);
+	dst_ts = sadb_address2ts(response.dst);
+	this->mutex->unlock(this->mutex);
+
+	hydra->kernel_interface->acquire(hydra->kernel_interface, reqid, src_ts,
+									 dst_ts);
+}
+
+/**
+ * Process a SADB_EXPIRE message from the kernel
+ */
+static void process_expire(private_kernel_pfkey_ipsec_t *this, struct sadb_msg* msg)
+{
+	pfkey_msg_t response;
+	u_int8_t protocol;
+	u_int32_t spi, reqid;
+	bool hard;
+
+	DBG2(DBG_KNL, "received an SADB_EXPIRE");
+
+	if (parse_pfkey_message(msg, &response) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "parsing SADB_EXPIRE from kernel failed");
+		return;
+	}
+
+	protocol = satype2proto(msg->sadb_msg_satype);
+	spi = response.sa->sadb_sa_spi;
+	reqid = response.x_sa2->sadb_x_sa2_reqid;
+	hard = response.lft_hard != NULL;
+
+	if (protocol != IPPROTO_ESP && protocol != IPPROTO_AH)
+	{
+		DBG2(DBG_KNL, "ignoring SADB_EXPIRE for SA with SPI %.8x and reqid {%u} "
+					  "which is not a CHILD_SA", ntohl(spi), reqid);
+		return;
+	}
+
+	hydra->kernel_interface->expire(hydra->kernel_interface, reqid, protocol,
+									spi, hard);
+}
+
+#ifdef SADB_X_MIGRATE
+/**
+ * Process a SADB_X_MIGRATE message from the kernel
+ */
+static void process_migrate(private_kernel_pfkey_ipsec_t *this, struct sadb_msg* msg)
+{
+	pfkey_msg_t response;
+	traffic_selector_t *src_ts, *dst_ts;
+	policy_dir_t dir;
+	u_int32_t reqid = 0;
+	host_t *local = NULL, *remote = NULL;
+
+	DBG2(DBG_KNL, "received an SADB_X_MIGRATE");
+
+	if (parse_pfkey_message(msg, &response) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "parsing SADB_X_MIGRATE from kernel failed");
+		return;
+	}
+	src_ts = sadb_address2ts(response.src);
+	dst_ts = sadb_address2ts(response.dst);
+	dir = kernel2dir(response.x_policy->sadb_x_policy_dir);
+	DBG2(DBG_KNL, "  policy %R === %R %N, id %u", src_ts, dst_ts,
+					 policy_dir_names, dir);
+
+	/* SADB_X_EXT_KMADDRESS is not present in unpatched kernels < 2.6.28 */
+	if (response.x_kmaddress)
+	{
+		sockaddr_t *local_addr, *remote_addr;
+		u_int32_t local_len;
+
+		local_addr  = (sockaddr_t*)&response.x_kmaddress[1];
+		local = host_create_from_sockaddr(local_addr);
+		local_len = (local_addr->sa_family == AF_INET6)?
+					sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
+		remote_addr = (sockaddr_t*)((u_int8_t*)local_addr + local_len);
+		remote = host_create_from_sockaddr(remote_addr);
+		DBG2(DBG_KNL, "  kmaddress: %H...%H", local, remote);
+	}
+
+	if (src_ts && dst_ts && local && remote)
+	{
+		hydra->kernel_interface->migrate(hydra->kernel_interface, reqid,
+										 src_ts, dst_ts, dir, local, remote);
+	}
+	else
+	{
+		DESTROY_IF(src_ts);
+		DESTROY_IF(dst_ts);
+		DESTROY_IF(local);
+		DESTROY_IF(remote);
+	}
+}
+#endif /*SADB_X_MIGRATE*/
+
+#ifdef SADB_X_NAT_T_NEW_MAPPING
+/**
+ * Process a SADB_X_NAT_T_NEW_MAPPING message from the kernel
+ */
+static void process_mapping(private_kernel_pfkey_ipsec_t *this, struct sadb_msg* msg)
+{
+	pfkey_msg_t response;
+	u_int32_t spi, reqid;
+	host_t *host;
+
+	DBG2(DBG_KNL, "received an SADB_X_NAT_T_NEW_MAPPING");
+
+	if (parse_pfkey_message(msg, &response) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "parsing SADB_X_NAT_T_NEW_MAPPING from kernel failed");
+		return;
+	}
+
+	if (!response.x_sa2)
+	{
+		DBG1(DBG_KNL, "received SADB_X_NAT_T_NEW_MAPPING is missing required "
+					  "information");
+		return;
+	}
+
+	spi = response.sa->sadb_sa_spi;
+	reqid = response.x_sa2->sadb_x_sa2_reqid;
+
+	if (satype2proto(msg->sadb_msg_satype) == IPPROTO_ESP)
+	{
+		sockaddr_t *sa = (sockaddr_t*)(response.dst + 1);
+		switch (sa->sa_family)
+		{
+			case AF_INET:
+			{
+				struct sockaddr_in *sin = (struct sockaddr_in*)sa;
+				sin->sin_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
+			}
+			case AF_INET6:
+			{
+				struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa;
+				sin6->sin6_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
+			}
+			default:
+				break;
+		}
+		host = host_create_from_sockaddr(sa);
+		if (host)
+		{
+			hydra->kernel_interface->mapping(hydra->kernel_interface, reqid,
+											 spi, host);
+		}
+	}
+}
+#endif /*SADB_X_NAT_T_NEW_MAPPING*/
+
+/**
+ * Receives events from kernel
+ */
+static job_requeue_t receive_events(private_kernel_pfkey_ipsec_t *this)
+{
+	unsigned char buf[PFKEY_BUFFER_SIZE];
+	struct sadb_msg *msg = (struct sadb_msg*)buf;
+	int len;
+	bool oldstate;
+
+	oldstate = thread_cancelability(TRUE);
+	len = recvfrom(this->socket_events, buf, sizeof(buf), 0, NULL, 0);
+	thread_cancelability(oldstate);
+
+	if (len < 0)
+	{
+		switch (errno)
+		{
+			case EINTR:
+				/* interrupted, try again */
+				return JOB_REQUEUE_DIRECT;
+			case EAGAIN:
+				/* no data ready, select again */
+				return JOB_REQUEUE_DIRECT;
+			default:
+				DBG1(DBG_KNL, "unable to receive from PF_KEY event socket");
+				sleep(1);
+				return JOB_REQUEUE_FAIR;
+		}
+	}
+
+	if (len < sizeof(struct sadb_msg) ||
+		msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg)))
+	{
+		DBG2(DBG_KNL, "received corrupted PF_KEY message");
+		return JOB_REQUEUE_DIRECT;
+	}
+	if (msg->sadb_msg_pid != 0)
+	{	/* not from kernel. not interested, try another one */
+		return JOB_REQUEUE_DIRECT;
+	}
+	if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT)
+	{
+		DBG1(DBG_KNL, "buffer was too small to receive the complete PF_KEY message");
+		return JOB_REQUEUE_DIRECT;
+	}
+
+	switch (msg->sadb_msg_type)
+	{
+		case SADB_ACQUIRE:
+			process_acquire(this, msg);
+			break;
+		case SADB_EXPIRE:
+			process_expire(this, msg);
+			break;
+#ifdef SADB_X_MIGRATE
+		case SADB_X_MIGRATE:
+			process_migrate(this, msg);
+			break;
+#endif /*SADB_X_MIGRATE*/
+#ifdef SADB_X_NAT_T_NEW_MAPPING
+		case SADB_X_NAT_T_NEW_MAPPING:
+			process_mapping(this, msg);
+			break;
+#endif /*SADB_X_NAT_T_NEW_MAPPING*/
+		default:
+			break;
+	}
+
+	return JOB_REQUEUE_DIRECT;
+}
+
+METHOD(kernel_ipsec_t, get_spi, status_t,
+	private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
+	u_int8_t protocol, u_int32_t reqid, u_int32_t *spi)
+{
+	unsigned char request[PFKEY_BUFFER_SIZE];
+	struct sadb_msg *msg, *out;
+	struct sadb_x_sa2 *sa2;
+	struct sadb_spirange *range;
+	pfkey_msg_t response;
+	u_int32_t received_spi = 0;
+	size_t len;
+
+	memset(&request, 0, sizeof(request));
+
+	msg = (struct sadb_msg*)request;
+	msg->sadb_msg_version = PF_KEY_V2;
+	msg->sadb_msg_type = SADB_GETSPI;
+	msg->sadb_msg_satype = proto2satype(protocol);
+	msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
+
+	sa2 = (struct sadb_x_sa2*)PFKEY_EXT_ADD_NEXT(msg);
+	sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
+	sa2->sadb_x_sa2_len = PFKEY_LEN(sizeof(struct sadb_spirange));
+	sa2->sadb_x_sa2_reqid = reqid;
+	PFKEY_EXT_ADD(msg, sa2);
+
+	add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0);
+	add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0);
+
+	range = (struct sadb_spirange*)PFKEY_EXT_ADD_NEXT(msg);
+	range->sadb_spirange_exttype = SADB_EXT_SPIRANGE;
+	range->sadb_spirange_len = PFKEY_LEN(sizeof(struct sadb_spirange));
+	range->sadb_spirange_min = 0xc0000000;
+	range->sadb_spirange_max = 0xcFFFFFFF;
+	PFKEY_EXT_ADD(msg, range);
+
+	if (pfkey_send(this, msg, &out, &len) == SUCCESS)
+	{
+		if (out->sadb_msg_errno)
+		{
+			DBG1(DBG_KNL, "allocating SPI failed: %s (%d)",
+					strerror(out->sadb_msg_errno), out->sadb_msg_errno);
+		}
+		else if (parse_pfkey_message(out, &response) == SUCCESS)
+		{
+			received_spi = response.sa->sadb_sa_spi;
+		}
+		free(out);
+	}
+
+	if (received_spi == 0)
+	{
+		return FAILED;
+	}
+
+	*spi = received_spi;
+	return SUCCESS;
+}
+
+METHOD(kernel_ipsec_t, get_cpi, status_t,
+	private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
+	u_int32_t reqid, u_int16_t *cpi)
+{
+	return FAILED;
+}
+
+METHOD(kernel_ipsec_t, add_sa, status_t,
+	private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, u_int32_t spi,
+	u_int8_t protocol, u_int32_t reqid, mark_t mark,
+	lifetime_cfg_t *lifetime, u_int16_t enc_alg, chunk_t enc_key,
+	u_int16_t int_alg, chunk_t int_key, ipsec_mode_t mode,
+	u_int16_t ipcomp, u_int16_t cpi, bool encap, bool inbound,
+	traffic_selector_t *src_ts, traffic_selector_t *dst_ts)
+{
+	unsigned char request[PFKEY_BUFFER_SIZE];
+	struct sadb_msg *msg, *out;
+	struct sadb_sa *sa;
+	struct sadb_x_sa2 *sa2;
+	struct sadb_lifetime *lft;
+	struct sadb_key *key;
+	size_t len;
+
+	memset(&request, 0, sizeof(request));
+
+	DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u}", ntohl(spi), reqid);
+
+	msg = (struct sadb_msg*)request;
+	msg->sadb_msg_version = PF_KEY_V2;
+	msg->sadb_msg_type = inbound ? SADB_UPDATE : SADB_ADD;
+	msg->sadb_msg_satype = proto2satype(protocol);
+	msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
+
+#ifdef __APPLE__
+	if (encap)
+	{
+		struct sadb_sa_2 *sa_2;
+		sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg);
+		sa_2->sadb_sa_natt_port = dst->get_port(dst);
+		sa = &sa_2->sa;
+		sa->sadb_sa_flags |= SADB_X_EXT_NATT;
+		len = sizeof(struct sadb_sa_2);
+	}
+	else
+#endif
+	{
+		sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
+		len = sizeof(struct sadb_sa);
+	}
+	sa->sadb_sa_exttype = SADB_EXT_SA;
+	sa->sadb_sa_len = PFKEY_LEN(len);
+	sa->sadb_sa_spi = spi;
+	sa->sadb_sa_replay = (protocol == IPPROTO_COMP) ? 0 : 32;
+	sa->sadb_sa_auth = lookup_algorithm(integrity_algs, int_alg);
+	sa->sadb_sa_encrypt = lookup_algorithm(encryption_algs, enc_alg);
+	PFKEY_EXT_ADD(msg, sa);
+
+	sa2 = (struct sadb_x_sa2*)PFKEY_EXT_ADD_NEXT(msg);
+	sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
+	sa2->sadb_x_sa2_len = PFKEY_LEN(sizeof(struct sadb_spirange));
+	sa2->sadb_x_sa2_mode = mode2kernel(mode);
+	sa2->sadb_x_sa2_reqid = reqid;
+	PFKEY_EXT_ADD(msg, sa2);
+
+	add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0);
+	add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0);
+
+	lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
+	lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
+	lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
+	lft->sadb_lifetime_allocations = lifetime->packets.rekey;
+	lft->sadb_lifetime_bytes = lifetime->bytes.rekey;
+	lft->sadb_lifetime_addtime = lifetime->time.rekey;
+	lft->sadb_lifetime_usetime = 0; /* we only use addtime */
+	PFKEY_EXT_ADD(msg, lft);
+
+	lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
+	lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
+	lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
+	lft->sadb_lifetime_allocations = lifetime->packets.life;
+	lft->sadb_lifetime_bytes = lifetime->bytes.life;
+	lft->sadb_lifetime_addtime = lifetime->time.life;
+	lft->sadb_lifetime_usetime = 0; /* we only use addtime */
+	PFKEY_EXT_ADD(msg, lft);
+
+	if (enc_alg != ENCR_UNDEFINED)
+	{
+		if (!sa->sadb_sa_encrypt)
+		{
+			DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
+				 encryption_algorithm_names, enc_alg);
+			return FAILED;
+		}
+		DBG2(DBG_KNL, "  using encryption algorithm %N with key size %d",
+			 encryption_algorithm_names, enc_alg, enc_key.len * 8);
+
+		key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg);
+		key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
+		key->sadb_key_bits = enc_key.len * 8;
+		key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + enc_key.len);
+		memcpy(key + 1, enc_key.ptr, enc_key.len);
+
+		PFKEY_EXT_ADD(msg, key);
+	}
+
+	if (int_alg != AUTH_UNDEFINED)
+	{
+		if (!sa->sadb_sa_auth)
+		{
+			DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
+					 integrity_algorithm_names, int_alg);
+			return FAILED;
+		}
+		DBG2(DBG_KNL, "  using integrity algorithm %N with key size %d",
+			 integrity_algorithm_names, int_alg, int_key.len * 8);
+
+		key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg);
+		key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
+		key->sadb_key_bits = int_key.len * 8;
+		key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + int_key.len);
+		memcpy(key + 1, int_key.ptr, int_key.len);
+
+		PFKEY_EXT_ADD(msg, key);
+	}
+
+	if (ipcomp != IPCOMP_NONE)
+	{
+		/*TODO*/
+	}
+
+#ifdef HAVE_NATT
+	if (encap)
+	{
+		add_encap_ext(msg, src, dst);
+	}
+#endif /*HAVE_NATT*/
+
+	if (pfkey_send(this, msg, &out, &len) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(spi));
+		return FAILED;
+	}
+	else if (out->sadb_msg_errno)
+	{
+		DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x: %s (%d)",
+				ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno);
+		free(out);
+		return FAILED;
+	}
+
+	free(out);
+	return SUCCESS;
+}
+
+METHOD(kernel_ipsec_t, update_sa, status_t,
+	private_kernel_pfkey_ipsec_t *this, u_int32_t spi, u_int8_t protocol,
+	u_int16_t cpi, host_t *src, host_t *dst, host_t *new_src, host_t *new_dst,
+	bool encap, bool new_encap, mark_t mark)
+{
+	unsigned char request[PFKEY_BUFFER_SIZE];
+	struct sadb_msg *msg, *out;
+	struct sadb_sa *sa;
+	pfkey_msg_t response;
+	size_t len;
+
+	/* we can't update the SA if any of the ip addresses have changed.
+	 * that's because we can't use SADB_UPDATE and by deleting and readding the
+	 * SA the sequence numbers would get lost */
+	if (!src->ip_equals(src, new_src) ||
+		!dst->ip_equals(dst, new_dst))
+	{
+		DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: address changes"
+				" are not supported", ntohl(spi));
+		return NOT_SUPPORTED;
+	}
+
+	memset(&request, 0, sizeof(request));
+
+	DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi));
+
+	msg = (struct sadb_msg*)request;
+	msg->sadb_msg_version = PF_KEY_V2;
+	msg->sadb_msg_type = SADB_GET;
+	msg->sadb_msg_satype = proto2satype(protocol);
+	msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
+
+	sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
+	sa->sadb_sa_exttype = SADB_EXT_SA;
+	sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
+	sa->sadb_sa_spi = spi;
+	PFKEY_EXT_ADD(msg, sa);
+
+	/* the kernel wants a SADB_EXT_ADDRESS_SRC to be present even though
+	 * it is not used for anything. */
+	add_anyaddr_ext(msg, dst->get_family(dst), SADB_EXT_ADDRESS_SRC);
+	add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0);
+
+	if (pfkey_send(this, msg, &out, &len) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x",
+				ntohl(spi));
+		return FAILED;
+	}
+	else if (out->sadb_msg_errno)
+	{
+		DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)",
+			ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno);
+		free(out);
+		return FAILED;
+	}
+	else if (parse_pfkey_message(out, &response) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: parsing response "
+				"from kernel failed", ntohl(spi));
+		free(out);
+		return FAILED;
+	}
+
+	DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H",
+		 ntohl(spi), src, dst, new_src, new_dst);
+
+	memset(&request, 0, sizeof(request));
+
+	msg = (struct sadb_msg*)request;
+	msg->sadb_msg_version = PF_KEY_V2;
+	msg->sadb_msg_type = SADB_UPDATE;
+	msg->sadb_msg_satype = proto2satype(protocol);
+	msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
+
+#ifdef __APPLE__
+	{
+		struct sadb_sa_2 *sa_2;
+		sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg);
+		sa_2->sa.sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa_2));
+		memcpy(&sa_2->sa, response.sa, sizeof(struct sadb_sa));
+		if (encap)
+		{
+			sa_2->sadb_sa_natt_port = new_dst->get_port(new_dst);
+			sa_2->sa.sadb_sa_flags |= SADB_X_EXT_NATT;
+		}
+	}
+#else
+	PFKEY_EXT_COPY(msg, response.sa);
+#endif
+	PFKEY_EXT_COPY(msg, response.x_sa2);
+
+	PFKEY_EXT_COPY(msg, response.src);
+	PFKEY_EXT_COPY(msg, response.dst);
+
+	PFKEY_EXT_COPY(msg, response.lft_soft);
+	PFKEY_EXT_COPY(msg, response.lft_hard);
+
+	if (response.key_encr)
+	{
+		PFKEY_EXT_COPY(msg, response.key_encr);
+	}
+
+	if (response.key_auth)
+	{
+		PFKEY_EXT_COPY(msg, response.key_auth);
+	}
+
+#ifdef HAVE_NATT
+	if (new_encap)
+	{
+		add_encap_ext(msg, new_src, new_dst);
+	}
+#endif /*HAVE_NATT*/
+
+	free(out);
+
+	if (pfkey_send(this, msg, &out, &len) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
+		return FAILED;
+	}
+	else if (out->sadb_msg_errno)
+	{
+		DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: %s (%d)",
+				ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno);
+		free(out);
+		return FAILED;
+	}
+	free(out);
+
+	return SUCCESS;
+}
+
+METHOD(kernel_ipsec_t, query_sa, status_t,
+	private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
+	u_int32_t spi, u_int8_t protocol, mark_t mark, u_int64_t *bytes)
+{
+	unsigned char request[PFKEY_BUFFER_SIZE];
+	struct sadb_msg *msg, *out;
+	struct sadb_sa *sa;
+	pfkey_msg_t response;
+	size_t len;
+
+	memset(&request, 0, sizeof(request));
+
+	DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi));
+
+	msg = (struct sadb_msg*)request;
+	msg->sadb_msg_version = PF_KEY_V2;
+	msg->sadb_msg_type = SADB_GET;
+	msg->sadb_msg_satype = proto2satype(protocol);
+	msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
+
+	sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
+	sa->sadb_sa_exttype = SADB_EXT_SA;
+	sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
+	sa->sadb_sa_spi = spi;
+	PFKEY_EXT_ADD(msg, sa);
+
+	/* the Linux Kernel doesn't care for the src address, but other systems do
+	 * (e.g. FreeBSD)
+	 */
+	add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0);
+	add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0);
+
+	if (pfkey_send(this, msg, &out, &len) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
+		return FAILED;
+	}
+	else if (out->sadb_msg_errno)
+	{
+		DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)",
+				ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno);
+		free(out);
+		return FAILED;
+	}
+	else if (parse_pfkey_message(out, &response) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
+		free(out);
+		return FAILED;
+	}
+	*bytes = response.lft_current->sadb_lifetime_bytes;
+
+	free(out);
+	return SUCCESS;
+}
+
+METHOD(kernel_ipsec_t, del_sa, status_t,
+	private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
+	u_int32_t spi, u_int8_t protocol, u_int16_t cpi, mark_t mark)
+{
+	unsigned char request[PFKEY_BUFFER_SIZE];
+	struct sadb_msg *msg, *out;
+	struct sadb_sa *sa;
+	size_t len;
+
+	memset(&request, 0, sizeof(request));
+
+	DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x", ntohl(spi));
+
+	msg = (struct sadb_msg*)request;
+	msg->sadb_msg_version = PF_KEY_V2;
+	msg->sadb_msg_type = SADB_DELETE;
+	msg->sadb_msg_satype = proto2satype(protocol);
+	msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
+
+	sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
+	sa->sadb_sa_exttype = SADB_EXT_SA;
+	sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
+	sa->sadb_sa_spi = spi;
+	PFKEY_EXT_ADD(msg, sa);
+
+	/* the Linux Kernel doesn't care for the src address, but other systems do
+	 * (e.g. FreeBSD)
+	 */
+	add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0);
+	add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0);
+
+	if (pfkey_send(this, msg, &out, &len) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x", ntohl(spi));
+		return FAILED;
+	}
+	else if (out->sadb_msg_errno)
+	{
+		DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x: %s (%d)",
+				ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno);
+		free(out);
+		return FAILED;
+	}
+
+	DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x", ntohl(spi));
+	free(out);
+	return SUCCESS;
+}
+
+METHOD(kernel_ipsec_t, add_policy, status_t,
+	private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
+	traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
+	policy_dir_t direction, policy_type_t type, ipsec_sa_cfg_t *sa,
+	mark_t mark, bool routed)
+{
+	unsigned char request[PFKEY_BUFFER_SIZE];
+	struct sadb_msg *msg, *out;
+	struct sadb_x_policy *pol;
+	struct sadb_x_ipsecrequest *req;
+	policy_entry_t *policy, *found = NULL;
+	pfkey_msg_t response;
+	size_t len;
+
+	if (dir2kernel(direction) == IPSEC_DIR_INVALID)
+	{
+		/* FWD policies are not supported on all platforms */
+		return SUCCESS;
+	}
+
+	/* create a policy */
+	policy = create_policy_entry(src_ts, dst_ts, direction, sa->reqid);
+
+	/* find a matching policy */
+	this->mutex->lock(this->mutex);
+	if (this->policies->find_first(this->policies,
+			(linked_list_match_t)policy_entry_equals, (void**)&found, policy) == SUCCESS)
+	{
+		/* use existing policy */
+		found->refcount++;
+		DBG2(DBG_KNL, "policy %R === %R %N already exists, increasing "
+					  "refcount", src_ts, dst_ts,
+					   policy_dir_names, direction);
+		policy_entry_destroy(policy);
+		policy = found;
+	}
+	else
+	{
+		/* apply the new one, if we have no such policy */
+		this->policies->insert_last(this->policies, policy);
+		policy->refcount = 1;
+	}
+
+	memset(&request, 0, sizeof(request));
+
+	DBG2(DBG_KNL, "adding policy %R === %R %N", src_ts, dst_ts,
+				   policy_dir_names, direction);
+
+	msg = (struct sadb_msg*)request;
+	msg->sadb_msg_version = PF_KEY_V2;
+	msg->sadb_msg_type = found ? SADB_X_SPDUPDATE : SADB_X_SPDADD;
+	msg->sadb_msg_satype = 0;
+	msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
+
+	pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
+	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
+	pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
+	pol->sadb_x_policy_id = 0;
+	pol->sadb_x_policy_dir = dir2kernel(direction);
+	pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
+#ifdef HAVE_STRUCT_SADB_X_POLICY_SADB_X_POLICY_PRIORITY
+	/* calculate priority based on source selector size, small size = high prio */
+	pol->sadb_x_policy_priority = routed ? PRIO_LOW : PRIO_HIGH;
+	pol->sadb_x_policy_priority -= policy->src.mask * 10;
+	pol->sadb_x_policy_priority -= policy->src.proto != IPSEC_PROTO_ANY ? 2 : 0;
+	pol->sadb_x_policy_priority -= policy->src.net->get_port(policy->src.net) ? 1 : 0;
+#endif
+
+	/* one or more sadb_x_ipsecrequest extensions are added to the sadb_x_policy extension */
+	req = (struct sadb_x_ipsecrequest*)(pol + 1);
+	req->sadb_x_ipsecrequest_proto = sa->esp.use ? IPPROTO_ESP : IPPROTO_AH;
+	/* !!! the length of this struct MUST be in octets instead of 64 bit words */
+	req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
+	req->sadb_x_ipsecrequest_mode = mode2kernel(sa->mode);
+	req->sadb_x_ipsecrequest_reqid = sa->reqid;
+	req->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
+	if (sa->mode == MODE_TUNNEL)
+	{
+		len = hostcpy(req + 1, src);
+		req->sadb_x_ipsecrequest_len += len;
+		len = hostcpy((char*)(req + 1) + len, dst);
+		req->sadb_x_ipsecrequest_len += len;
+	}
+
+	pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len);
+	PFKEY_EXT_ADD(msg, pol);
+
+	add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
+				 policy->src.mask);
+	add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
+				 policy->dst.mask);
+
+#ifdef __FreeBSD__
+	{	/* on FreeBSD a lifetime has to be defined to be able to later query
+		 * the current use time. */
+		struct sadb_lifetime *lft;
+		lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
+		lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
+		lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
+		lft->sadb_lifetime_addtime = LONG_MAX;
+		PFKEY_EXT_ADD(msg, lft);
+	}
+#endif
+
+	this->mutex->unlock(this->mutex);
+
+	if (pfkey_send(this, msg, &out, &len) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to add policy %R === %R %N", src_ts, dst_ts,
+					   policy_dir_names, direction);
+		return FAILED;
+	}
+	else if (out->sadb_msg_errno)
+	{
+		DBG1(DBG_KNL, "unable to add policy %R === %R %N: %s (%d)", src_ts, dst_ts,
+					   policy_dir_names, direction,
+					   strerror(out->sadb_msg_errno), out->sadb_msg_errno);
+		free(out);
+		return FAILED;
+	}
+	else if (parse_pfkey_message(out, &response) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to add policy %R === %R %N: parsing response "
+				"from kernel failed", src_ts, dst_ts, policy_dir_names, direction);
+		free(out);
+		return FAILED;
+	}
+
+	this->mutex->lock(this->mutex);
+
+	/* we try to find the policy again and update the kernel index */
+	if (this->policies->find_last(this->policies, NULL, (void**)&policy) != SUCCESS)
+	{
+		DBG2(DBG_KNL, "unable to update index, the policy %R === %R %N is "
+				"already gone, ignoring", src_ts, dst_ts, policy_dir_names, direction);
+		this->mutex->unlock(this->mutex);
+		free(out);
+		return SUCCESS;
+	}
+	policy->index = response.x_policy->sadb_x_policy_id;
+	free(out);
+
+	/* install a route, if:
+	 * - we are NOT updating a policy
+	 * - this is a forward policy (to just get one for each child)
+	 * - we are in tunnel mode
+	 * - we are not using IPv6 (does not work correctly yet!)
+	 * - routing is not disabled via strongswan.conf
+	 */
+	if (policy->route == NULL && direction == POLICY_FWD &&
+		sa->mode != MODE_TRANSPORT && src->get_family(src) != AF_INET6 &&
+		this->install_routes)
+	{
+		route_entry_t *route = malloc_thing(route_entry_t);
+
+		if (hydra->kernel_interface->get_address_by_ts(hydra->kernel_interface,
+				dst_ts, &route->src_ip) == SUCCESS)
+		{
+			/* get the nexthop to src (src as we are in POLICY_FWD).*/
+			route->gateway = hydra->kernel_interface->get_nexthop(
+									hydra->kernel_interface, src);
+			route->if_name = hydra->kernel_interface->get_interface(
+									hydra->kernel_interface, dst);
+			route->dst_net = chunk_clone(policy->src.net->get_address(policy->src.net));
+			route->prefixlen = policy->src.mask;
+
+			if (route->if_name)
+			{
+				switch (hydra->kernel_interface->add_route(
+									hydra->kernel_interface, route->dst_net,
+									route->prefixlen, route->gateway,
+									route->src_ip, route->if_name))
+				{
+					default:
+						DBG1(DBG_KNL, "unable to install source route for %H",
+							 route->src_ip);
+						/* FALL */
+					case ALREADY_DONE:
+						/* route exists, do not uninstall */
+						route_entry_destroy(route);
+						break;
+					case SUCCESS:
+						/* cache the installed route */
+						policy->route = route;
+						break;
+				}
+			}
+			else
+			{
+				route_entry_destroy(route);
+			}
+		}
+		else
+		{
+			free(route);
+		}
+	}
+
+	this->mutex->unlock(this->mutex);
+
+	return SUCCESS;
+}
+
+METHOD(kernel_ipsec_t, query_policy, status_t,
+	private_kernel_pfkey_ipsec_t *this, traffic_selector_t *src_ts,
+	traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark,
+	u_int32_t *use_time)
+{
+	unsigned char request[PFKEY_BUFFER_SIZE];
+	struct sadb_msg *msg, *out;
+	struct sadb_x_policy *pol;
+	policy_entry_t *policy, *found = NULL;
+	pfkey_msg_t response;
+	size_t len;
+
+	if (dir2kernel(direction) == IPSEC_DIR_INVALID)
+	{
+		/* FWD policies are not supported on all platforms */
+		return NOT_FOUND;
+	}
+
+	DBG2(DBG_KNL, "querying policy %R === %R %N", src_ts, dst_ts,
+				   policy_dir_names, direction);
+
+	/* create a policy */
+	policy = create_policy_entry(src_ts, dst_ts, direction, 0);
+
+	/* find a matching policy */
+	this->mutex->lock(this->mutex);
+	if (this->policies->find_first(this->policies,
+			(linked_list_match_t)policy_entry_equals, (void**)&found, policy) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "querying policy %R === %R %N failed, not found", src_ts,
+					   dst_ts, policy_dir_names, direction);
+		policy_entry_destroy(policy);
+		this->mutex->unlock(this->mutex);
+		return NOT_FOUND;
+	}
+	policy_entry_destroy(policy);
+	policy = found;
+
+	memset(&request, 0, sizeof(request));
+
+	msg = (struct sadb_msg*)request;
+	msg->sadb_msg_version = PF_KEY_V2;
+	msg->sadb_msg_type = SADB_X_SPDGET;
+	msg->sadb_msg_satype = 0;
+	msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
+
+	pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
+	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
+	pol->sadb_x_policy_id = policy->index;
+	pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
+	pol->sadb_x_policy_dir = dir2kernel(direction);
+	pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
+	PFKEY_EXT_ADD(msg, pol);
+
+	add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
+				 policy->src.mask);
+	add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
+				 policy->dst.mask);
+
+	this->mutex->unlock(this->mutex);
+
+	if (pfkey_send(this, msg, &out, &len) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to query policy %R === %R %N", src_ts, dst_ts,
+					   policy_dir_names, direction);
+		return FAILED;
+	}
+	else if (out->sadb_msg_errno)
+	{
+		DBG1(DBG_KNL, "unable to query policy %R === %R %N: %s (%d)", src_ts,
+					   dst_ts, policy_dir_names, direction,
+					   strerror(out->sadb_msg_errno), out->sadb_msg_errno);
+		free(out);
+		return FAILED;
+	}
+	else if (parse_pfkey_message(out, &response) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to query policy %R === %R %N: parsing response "
+				"from kernel failed", src_ts, dst_ts, policy_dir_names, direction);
+		free(out);
+		return FAILED;
+	}
+	else if (response.lft_current == NULL)
+	{
+		DBG1(DBG_KNL, "unable to query policy %R === %R %N: kernel reports no "
+			 "use time", src_ts, dst_ts, policy_dir_names, direction);
+		free(out);
+		return FAILED;
+	}
+	/* we need the monotonic time, but the kernel returns system time. */
+	if (response.lft_current->sadb_lifetime_usetime)
+	{
+		*use_time = time_monotonic(NULL) -
+					(time(NULL) - response.lft_current->sadb_lifetime_usetime);
+	}
+	else
+	{
+		*use_time = 0;
+	}
+	free(out);
+
+	return SUCCESS;
+}
+
+METHOD(kernel_ipsec_t, del_policy, status_t,
+	private_kernel_pfkey_ipsec_t *this, traffic_selector_t *src_ts,
+	traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark,
+	bool unrouted)
+{
+	unsigned char request[PFKEY_BUFFER_SIZE];
+	struct sadb_msg *msg, *out;
+	struct sadb_x_policy *pol;
+	policy_entry_t *policy, *found = NULL;
+	route_entry_t *route;
+	size_t len;
+
+	if (dir2kernel(direction) == IPSEC_DIR_INVALID)
+	{
+		/* FWD policies are not supported on all platforms */
+		return SUCCESS;
+	}
+
+	DBG2(DBG_KNL, "deleting policy %R === %R %N", src_ts, dst_ts,
+				   policy_dir_names, direction);
+
+	/* create a policy */
+	policy = create_policy_entry(src_ts, dst_ts, direction, 0);
+
+	/* find a matching policy */
+	this->mutex->lock(this->mutex);
+	if (this->policies->find_first(this->policies,
+			(linked_list_match_t)policy_entry_equals, (void**)&found, policy) == SUCCESS)
+	{
+		if (--found->refcount > 0)
+		{
+			/* is used by more SAs, keep in kernel */
+			DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed");
+			policy_entry_destroy(policy);
+			this->mutex->unlock(this->mutex);
+			return SUCCESS;
+		}
+		/* remove if last reference */
+		this->policies->remove(this->policies, found, NULL);
+		policy_entry_destroy(policy);
+		policy = found;
+	}
+	else
+	{
+		DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found", src_ts,
+					   dst_ts, policy_dir_names, direction);
+		policy_entry_destroy(policy);
+		this->mutex->unlock(this->mutex);
+		return NOT_FOUND;
+	}
+	this->mutex->unlock(this->mutex);
+
+	memset(&request, 0, sizeof(request));
+
+	msg = (struct sadb_msg*)request;
+	msg->sadb_msg_version = PF_KEY_V2;
+	msg->sadb_msg_type = SADB_X_SPDDELETE;
+	msg->sadb_msg_satype = 0;
+	msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
+
+	pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
+	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
+	pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
+	pol->sadb_x_policy_dir = dir2kernel(direction);
+	pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
+	PFKEY_EXT_ADD(msg, pol);
+
+	add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
+				 policy->src.mask);
+	add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
+				 policy->dst.mask);
+
+	route = policy->route;
+	policy->route = NULL;
+	policy_entry_destroy(policy);
+
+	if (pfkey_send(this, msg, &out, &len) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to delete policy %R === %R %N", src_ts, dst_ts,
+					   policy_dir_names, direction);
+		return FAILED;
+	}
+	else if (out->sadb_msg_errno)
+	{
+		DBG1(DBG_KNL, "unable to delete policy %R === %R %N: %s (%d)", src_ts,
+					   dst_ts, policy_dir_names, direction,
+					   strerror(out->sadb_msg_errno), out->sadb_msg_errno);
+		free(out);
+		return FAILED;
+	}
+	free(out);
+
+	if (route)
+	{
+		if (hydra->kernel_interface->del_route(hydra->kernel_interface,
+				route->dst_net, route->prefixlen, route->gateway,
+				route->src_ip, route->if_name) != SUCCESS)
+		{
+			DBG1(DBG_KNL, "error uninstalling route installed with "
+						  "policy %R === %R %N", src_ts, dst_ts,
+						   policy_dir_names, direction);
+		}
+		route_entry_destroy(route);
+	}
+
+	return SUCCESS;
+}
+
+/**
+ * Register a socket for AQUIRE/EXPIRE messages
+ */
+static status_t register_pfkey_socket(private_kernel_pfkey_ipsec_t *this,
+									  u_int8_t satype)
+{
+	unsigned char request[PFKEY_BUFFER_SIZE];
+	struct sadb_msg *msg, *out;
+	size_t len;
+
+	memset(&request, 0, sizeof(request));
+
+	msg = (struct sadb_msg*)request;
+	msg->sadb_msg_version = PF_KEY_V2;
+	msg->sadb_msg_type = SADB_REGISTER;
+	msg->sadb_msg_satype = satype;
+	msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
+
+	if (pfkey_send_socket(this, this->socket_events, msg, &out, &len) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to register PF_KEY socket");
+		return FAILED;
+	}
+	else if (out->sadb_msg_errno)
+	{
+		DBG1(DBG_KNL, "unable to register PF_KEY socket: %s (%d)",
+					   strerror(out->sadb_msg_errno), out->sadb_msg_errno);
+		free(out);
+		return FAILED;
+	}
+	free(out);
+	return SUCCESS;
+}
+
+METHOD(kernel_ipsec_t, bypass_socket, bool,
+	private_kernel_pfkey_ipsec_t *this, int fd, int family)
+{
+	struct sadb_x_policy policy;
+	u_int sol, ipsec_policy;
+
+	switch (family)
+	{
+		case AF_INET:
+		{
+			sol = SOL_IP;
+			ipsec_policy = IP_IPSEC_POLICY;
+			break;
+		}
+		case AF_INET6:
+		{
+			sol = SOL_IPV6;
+			ipsec_policy = IPV6_IPSEC_POLICY;
+			break;
+		}
+		default:
+			return FALSE;
+	}
+
+	memset(&policy, 0, sizeof(policy));
+	policy.sadb_x_policy_len = sizeof(policy) / sizeof(u_int64_t);
+	policy.sadb_x_policy_exttype = SADB_X_EXT_POLICY;
+	policy.sadb_x_policy_type = IPSEC_POLICY_BYPASS;
+
+	policy.sadb_x_policy_dir = IPSEC_DIR_OUTBOUND;
+	if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0)
+	{
+		DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s",
+			 strerror(errno));
+		return FALSE;
+	}
+	policy.sadb_x_policy_dir = IPSEC_DIR_INBOUND;
+	if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0)
+	{
+		DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s",
+			 strerror(errno));
+		return FALSE;
+	}
+	return TRUE;
+}
+
+METHOD(kernel_ipsec_t, destroy, void,
+	private_kernel_pfkey_ipsec_t *this)
+{
+	if (this->job)
+	{
+		this->job->cancel(this->job);
+	}
+	if (this->socket > 0)
+	{
+		close(this->socket);
+	}
+	if (this->socket_events > 0)
+	{
+		close(this->socket_events);
+	}
+	this->policies->destroy_function(this->policies, (void*)policy_entry_destroy);
+	this->mutex->destroy(this->mutex);
+	this->mutex_pfkey->destroy(this->mutex_pfkey);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+kernel_pfkey_ipsec_t *kernel_pfkey_ipsec_create()
+{
+	private_kernel_pfkey_ipsec_t *this;
+
+	INIT(this,
+		.public = {
+			.interface = {
+				.get_spi = _get_spi,
+				.get_cpi = _get_cpi,
+				.add_sa  = _add_sa,
+				.update_sa = _update_sa,
+				.query_sa = _query_sa,
+				.del_sa = _del_sa,
+				.add_policy = _add_policy,
+				.query_policy = _query_policy,
+				.del_policy = _del_policy,
+				.bypass_socket = _bypass_socket,
+				.destroy = _destroy,
+			},
+		},
+		.policies = linked_list_create(),
+		.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
+		.mutex_pfkey = mutex_create(MUTEX_TYPE_DEFAULT),
+		.install_routes = lib->settings->get_bool(lib->settings,
+												  "%s.install_routes", TRUE,
+												  hydra->daemon),
+	);
+
+	if (streq(hydra->daemon, "pluto"))
+	{	/* no routes for pluto, they are installed via updown script */
+		this->install_routes = FALSE;
+	}
+
+	/* create a PF_KEY socket to communicate with the kernel */
+	this->socket = socket(PF_KEY, SOCK_RAW, PF_KEY_V2);
+	if (this->socket <= 0)
+	{
+		DBG1(DBG_KNL, "unable to create PF_KEY socket");
+		destroy(this);
+		return NULL;
+	}
+
+	/* create a PF_KEY socket for ACQUIRE & EXPIRE */
+	this->socket_events = socket(PF_KEY, SOCK_RAW, PF_KEY_V2);
+	if (this->socket_events <= 0)
+	{
+		DBG1(DBG_KNL, "unable to create PF_KEY event socket");
+		destroy(this);
+		return NULL;
+	}
+
+	/* register the event socket */
+	if (register_pfkey_socket(this, SADB_SATYPE_ESP) != SUCCESS ||
+		register_pfkey_socket(this, SADB_SATYPE_AH) != SUCCESS)
+	{
+		DBG1(DBG_KNL, "unable to register PF_KEY event socket");
+		destroy(this);
+		return NULL;
+	}
+
+	this->job = callback_job_create((callback_job_cb_t)receive_events,
+									this, NULL, NULL);
+	lib->processor->queue_job(lib->processor, (job_t*)this->job);
+
+	return &this->public;
+}
+
diff --git a/src/libhydra/plugins/kernel_pfkey/kernel_pfkey_ipsec.h b/src/libhydra/plugins/kernel_pfkey/kernel_pfkey_ipsec.h
new file mode 100644
index 000000000..649f93733
--- /dev/null
+++ b/src/libhydra/plugins/kernel_pfkey/kernel_pfkey_ipsec.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2008 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.
+ */
+
+/**
+ * @defgroup kernel_pfkey_ipsec_i kernel_pfkey_ipsec
+ * @{ @ingroup kernel_pfkey
+ */
+
+#ifndef KERNEL_PFKEY_IPSEC_H_
+#define KERNEL_PFKEY_IPSEC_H_
+
+#include <kernel/kernel_ipsec.h>
+
+typedef struct kernel_pfkey_ipsec_t kernel_pfkey_ipsec_t;
+
+/**
+ * Implementation of the kernel ipsec interface using PF_KEY.
+ */
+struct kernel_pfkey_ipsec_t {
+
+	/**
+	 * Implements kernel_ipsec_t interface
+	 */
+	kernel_ipsec_t interface;
+};
+
+/**
+ * Create a PF_KEY kernel ipsec interface instance.
+ *
+ * @return			kernel_pfkey_ipsec_t instance
+ */
+kernel_pfkey_ipsec_t *kernel_pfkey_ipsec_create();
+
+#endif /** KERNEL_PFKEY_IPSEC_H_ @}*/
diff --git a/src/libhydra/plugins/kernel_pfkey/kernel_pfkey_plugin.c b/src/libhydra/plugins/kernel_pfkey/kernel_pfkey_plugin.c
new file mode 100644
index 000000000..781ba5008
--- /dev/null
+++ b/src/libhydra/plugins/kernel_pfkey/kernel_pfkey_plugin.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2008 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_pfkey_plugin.h"
+
+#include "kernel_pfkey_ipsec.h"
+
+#include <hydra.h>
+
+typedef struct private_kernel_pfkey_plugin_t private_kernel_pfkey_plugin_t;
+
+/**
+ * private data of kernel PF_KEY plugin
+ */
+struct private_kernel_pfkey_plugin_t {
+	/**
+	 * implements plugin interface
+	 */
+	kernel_pfkey_plugin_t public;
+};
+
+/**
+ * Implementation of plugin_t.destroy
+ */
+static void destroy(private_kernel_pfkey_plugin_t *this)
+{
+	hydra->kernel_interface->remove_ipsec_interface(hydra->kernel_interface,
+						(kernel_ipsec_constructor_t)kernel_pfkey_ipsec_create);
+	free(this);
+}
+
+/*
+ * see header file
+ */
+plugin_t *kernel_pfkey_plugin_create()
+{
+	private_kernel_pfkey_plugin_t *this = malloc_thing(private_kernel_pfkey_plugin_t);
+
+	this->public.plugin.destroy = (void(*)(plugin_t*))destroy;
+
+	hydra->kernel_interface->add_ipsec_interface(hydra->kernel_interface,
+						(kernel_ipsec_constructor_t)kernel_pfkey_ipsec_create);
+
+	return &this->public.plugin;
+}
diff --git a/src/libhydra/plugins/kernel_pfkey/kernel_pfkey_plugin.h b/src/libhydra/plugins/kernel_pfkey/kernel_pfkey_plugin.h
new file mode 100644
index 000000000..51db4d8d3
--- /dev/null
+++ b/src/libhydra/plugins/kernel_pfkey/kernel_pfkey_plugin.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2008 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.
+ */
+
+/**
+ * @defgroup kernel_pfkey kernel_pfkey
+ * @ingroup hplugins
+ *
+ * @defgroup kernel_pfkey_plugin kernel_pfkey_plugin
+ * @{ @ingroup kernel_pfkey
+ */
+
+#ifndef KERNEL_PFKEY_PLUGIN_H_
+#define KERNEL_PFKEY_PLUGIN_H_
+
+#include <plugins/plugin.h>
+
+typedef struct kernel_pfkey_plugin_t kernel_pfkey_plugin_t;
+
+/**
+ * PF_KEY kernel interface plugin
+ */
+struct kernel_pfkey_plugin_t {
+
+	/**
+	 * implements plugin interface
+	 */
+	plugin_t plugin;
+};
+
+#endif /** KERNEL_PFKEY_PLUGIN_H_ @}*/