- New upstream release.

5 files changed, 712 insertions, 2850 deletions

diff --git a/src/charon/kernel/kernel_interface.c b/src/charon/kernel/kernel_interface.c
index f5cb40977..3c82b580e 100644
--- a/src/charon/kernel/kernel_interface.c
+++ b/src/charon/kernel/kernel_interface.c
@@ -1,13 +1,6 @@
 /*
- * Copyright (C) 2006-2008 Tobias Brunner
- * Copyright (C) 2005-2007 Martin Willi
- * Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser
- * Copyright (C) 2006 Daniel Roethlisberger
- * Copyright (C) 2005 Jan Hutter
+ * Copyright (C) 2008 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
- * Copyright (C) 2003 Herbert Xu.
- * 
- * Based on xfrm code from pluto.
  *
  * 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
@@ -19,2855 +12,292 @@
  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * for more details.
  *
- * $Id: kernel_interface.c 4104 2008-06-24 15:35:09Z tobias $
+ * $Id: kernel_interface.c 4406 2008-10-10 08:36:01Z martin $
  */
 
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/time.h>
-#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
-#include <linux/xfrm.h>
-#include <linux/udp.h>
-#include <pthread.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <string.h>
-#include <net/if.h>
-#include <sys/ioctl.h>
-
 #include "kernel_interface.h"
 
+#include <pthread.h>
+
 #include <daemon.h>
 #include <utils/linked_list.h>
-#include <processing/jobs/delete_child_sa_job.h>
-#include <processing/jobs/rekey_child_sa_job.h>
-#include <processing/jobs/acquire_job.h>
-#include <processing/jobs/callback_job.h>
-#include <processing/jobs/roam_job.h>
-
-/** routing table for routes installed by us */
-#ifndef IPSEC_ROUTING_TABLE
-#define IPSEC_ROUTING_TABLE 100
-#endif
-#ifndef IPSEC_ROUTING_TABLE_PRIO
-#define IPSEC_ROUTING_TABLE_PRIO 100
-#endif
-
-/** kernel level protocol identifiers */
-#define KERNEL_ESP 50
-#define KERNEL_AH 51
-
-/** default priority of installed policies */
-#define PRIO_LOW 3000
-#define PRIO_HIGH 2000
-
-/** delay before firing roam jobs (ms) */
-#define ROAM_DELAY 100
-
-#define BUFFER_SIZE 1024
-
-/**
- * returns a pointer to the first rtattr following the nlmsghdr *nlh and the 
- * 'usual' netlink data x like 'struct xfrm_usersa_info' 
- */
-#define XFRM_RTA(nlh, x) ((struct rtattr*)(NLMSG_DATA(nlh) + NLMSG_ALIGN(sizeof(x))))
-/**
- * returns a pointer to the next rtattr following rta.
- * !!! do not use this to parse messages. use RTA_NEXT and RTA_OK instead !!!
- */
-#define XFRM_RTA_NEXT(rta) ((struct rtattr*)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len)))
-/**
- * returns the total size of attached rta data 
- * (after 'usual' netlink data x like 'struct xfrm_usersa_info') 
- */
-#define XFRM_PAYLOAD(nlh, x) NLMSG_PAYLOAD(nlh, sizeof(x))
-
-typedef struct kernel_algorithm_t kernel_algorithm_t;
-
-/**
- * Mapping from the algorithms defined in IKEv2 to
- * kernel level algorithm names and their key length
- */
-struct kernel_algorithm_t {
-	/**
-	 * Identifier specified in IKEv2
-	 */
-	int ikev2_id;
-	
-	/**
-	 * Name of the algorithm, as used as kernel identifier
-	 */
-	char *name;
-	
-	/**
-	 * Key length in bits, if fixed size
-	 */
-	u_int key_size;
-};
-#define END_OF_LIST -1
-
-/**
- * Algorithms for encryption
- */
-static kernel_algorithm_t encryption_algs[] = {
-/*	{ENCR_DES_IV64, 		"***", 					0}, */
-	{ENCR_DES, 				"des", 					64},
-	{ENCR_3DES, 			"des3_ede",				192},
-/*	{ENCR_RC5, 				"***", 					0}, */
-/*	{ENCR_IDEA, 			"***",					0}, */
-	{ENCR_CAST, 			"cast128",				0},
-	{ENCR_BLOWFISH, 		"blowfish",				0},
-/*	{ENCR_3IDEA, 			"***",					0}, */
-/*	{ENCR_DES_IV32, 		"***",					0}, */
-	{ENCR_NULL, 			"cipher_null",			0},
-	{ENCR_AES_CBC,	 		"aes",					0},
-/*	{ENCR_AES_CTR, 			"***",					0}, */
-	{ENCR_AES_CCM_ICV8,		"rfc4309(ccm(aes))",	64},	/* key_size = ICV size */
-	{ENCR_AES_CCM_ICV12,	"rfc4309(ccm(aes))",	96},	/* key_size = ICV size */
-	{ENCR_AES_CCM_ICV16,	"rfc4309(ccm(aes))",	128},	/* key_size = ICV size */
-	{ENCR_AES_GCM_ICV8,		"rfc4106(gcm(aes))",	64},	/* key_size = ICV size */
-	{ENCR_AES_GCM_ICV12,	"rfc4106(gcm(aes))",	96},	/* key_size = ICV size */
-	{ENCR_AES_GCM_ICV16,	"rfc4106(gcm(aes))",	128},	/* key_size = ICV size */
-	{END_OF_LIST, 		NULL,			0},
-};
-
-/**
- * Algorithms for integrity protection
- */
-static kernel_algorithm_t integrity_algs[] = {
-	{AUTH_HMAC_MD5_96, 			"md5",			128},
-	{AUTH_HMAC_SHA1_96,			"sha1",			160},
-	{AUTH_HMAC_SHA2_256_128,	"sha256",		256},
-	{AUTH_HMAC_SHA2_384_192,	"sha384",		384},
-	{AUTH_HMAC_SHA2_512_256,	"sha512",		512},
-/*	{AUTH_DES_MAC,				"***",			0}, */
-/*	{AUTH_KPDK_MD5,				"***",			0}, */
-	{AUTH_AES_XCBC_96,			"xcbc(aes)",	128},
-	{END_OF_LIST, 				NULL,			0},
-};
-
-/**
- * Algorithms for IPComp
- */
-static kernel_algorithm_t compression_algs[] = {
-/*	{IPCOMP_OUI, 			"***",			0}, */
-	{IPCOMP_DEFLATE,		"deflate",		0},
-	{IPCOMP_LZS,			"lzs",			0},
-	{IPCOMP_LZJH,			"lzjh",			0},
-	{END_OF_LIST, 			NULL,			0},
-};
-
-/**
- * Look up a kernel algorithm name and its key size
- */
-static char* lookup_algorithm(kernel_algorithm_t *kernel_algo, 
-					   u_int16_t ikev2_algo, u_int16_t *key_size)
-{
-	while (kernel_algo->ikev2_id != END_OF_LIST)
-	{
-		if (ikev2_algo == kernel_algo->ikev2_id)
-		{
-			/* match, evaluate key length */
-			if (key_size && *key_size == 0)
-			{	/* update key size if not set */
-				*key_size = kernel_algo->key_size;
-			}
-			return kernel_algo->name;
-		}
-		kernel_algo++;
-	}
-	return NULL;
-}
-
-typedef struct route_entry_t route_entry_t;
-
-/**
- * installed routing entry
- */
-struct route_entry_t {
-
-	/** Index of the interface the route is bound to */
-	int if_index;
-
-	/** 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)
-{
-	this->src_ip->destroy(this->src_ip);
-	this->gateway->destroy(this->gateway);
-	chunk_free(&this->dst_net);
-	free(this);
-}
-
-typedef struct policy_entry_t policy_entry_t;
-
-/**
- * installed kernel policy.
- */
-struct policy_entry_t {
-	
-	/** direction of this policy: in, out, forward */
-	u_int8_t direction;
-	
-	/** reqid of the policy */
-	u_int32_t reqid;
-	
-	/** parameters of installed policy */
-	struct xfrm_selector sel;
-	
-	/** associated route installed for this policy */
-	route_entry_t *route;
-	
-	/** by how many CHILD_SA's this policy is used */
-	u_int refcount;
-};
-
-typedef struct addr_entry_t addr_entry_t;
-
-/**
- * IP address in an inface_entry_t
- */
-struct addr_entry_t {
-	
-	/** The ip address */
-	host_t *ip;
-	
-	/** virtual IP managed by us */
-	bool virtual;
-	
-	/** scope of the address */
-	u_char scope;
-	
-	/** Number of times this IP is used, if virtual */
-	u_int refcount;
-};
-
-/**
- * destroy a addr_entry_t object
- */
-static void addr_entry_destroy(addr_entry_t *this)
-{
-	this->ip->destroy(this->ip);
-	free(this);
-}
-
-typedef struct iface_entry_t iface_entry_t;
-
-/**
- * A network interface on this system, containing addr_entry_t's
- */
-struct iface_entry_t {
-	
-	/** interface index */
-	int ifindex;
-	
-	/** name of the interface */
-	char ifname[IFNAMSIZ];
-	
-	/** interface flags, as in netdevice(7) SIOCGIFFLAGS */
-	u_int flags;
-	
-	/** list of addresses as host_t */
-	linked_list_t *addrs;
-};
-
-/**
- * destroy an interface entry
- */
-static void iface_entry_destroy(iface_entry_t *this)
-{
-	this->addrs->destroy_function(this->addrs, (void*)addr_entry_destroy);
-	free(this);
-}
+#include <utils/mutex.h>
 
 typedef struct private_kernel_interface_t private_kernel_interface_t;
 
 /**
- * Private variables and functions of kernel_interface class.
+ * Private data of a kernel_interface_t object.
  */
 struct private_kernel_interface_t {
+
 	/**
-	 * Public part of the kernel_interface_t object.
+	 * Public part of kernel_interface_t object.
 	 */
 	kernel_interface_t public;
 	
 	/**
-	 * mutex to lock access to netlink socket
-	 */
-	pthread_mutex_t nl_mutex;
-	
-	/**
-	 * mutex to lock access to various lists
+	 * list of registered ipsec kernel interfaces
 	 */
-	pthread_mutex_t mutex;
+	linked_list_t *ipsec_interfaces;
 	
 	/**
-	 * condition variable to signal virtual IP add/removal
+	 * list of registered network kernel interfaces
 	 */
-	pthread_cond_t cond;
+	linked_list_t *net_interfaces;
 	
 	/**
-	 * List of installed policies (policy_entry_t)
+	 * ipsec interface
 	 */
-	linked_list_t *policies;
+	kernel_ipsec_t *ipsec;
 	
 	/**
-	 * Cached list of interfaces and its adresses (iface_entry_t)
+	 * network interface
 	 */
-	linked_list_t *ifaces;
+	kernel_net_t *net;
 	
 	/**
-	 * iterator used in hook()
+	 * locking mutex
 	 */
-	iterator_t *hiter;
-	 
-	/**
-	 * job receiving netlink events
-	 */
-	callback_job_t *job;
-	
-	/**
-	 * current sequence number for netlink request
-	 */
-	int seq;
-	
-	/**
-	 * Netlink xfrm socket (IPsec)
-	 */
-	int socket_xfrm;
-	
-	/**
-	 * netlink xfrm socket to receive acquire and expire events
-	 */
-	int socket_xfrm_events;
-	
-	/**
-	 * Netlink rt socket (routing)
-	 */
-	int socket_rt;
-	
-	/**
-	 * Netlink rt socket to receive address change events
-	 */
-	int socket_rt_events;
-	
-	/**
-	 * time of the last roam_job
-	 */
-	struct timeval last_roam;
-	
-	/**
-	 * whether to install routes along policies
-	 */
-	bool install_routes;
-	
-	/**
-	 * routing table to install routes
-	 */
-	int routing_table;
-	
-	/**
-	 * priority of used routing table
-	 */
-	int routing_table_prio;
+	mutex_t *mutex;
 };
 
 /**
- * convert a host_t to a struct xfrm_address
+ * Implementation of kernel_interface_t.get_spi
  */
-static void host2xfrm(host_t *host, xfrm_address_t *xfrm)
+static status_t get_spi(private_kernel_interface_t *this, host_t *src, host_t *dst, 
+				 protocol_id_t protocol, u_int32_t reqid, u_int32_t *spi)
 {
-	chunk_t chunk = host->get_address(host);
-	memcpy(xfrm, chunk.ptr, min(chunk.len, sizeof(xfrm_address_t)));	
+	return this->ipsec->get_spi(this->ipsec, src, dst, protocol, reqid, spi);
 }
 
 /**
- * convert a traffic selector address range to subnet and its mask.
+ * Implementation of kernel_interface_t.get_cpi
  */
-static void ts2subnet(traffic_selector_t* ts, 
-					  xfrm_address_t *net, u_int8_t *mask)
+static status_t get_cpi(private_kernel_interface_t *this, host_t *src, host_t *dst, 
+					u_int32_t reqid, u_int16_t *cpi)
 {
-	/* there is no way to do this cleanly, as the address range may
-	 * be anything else but a subnet. We use from_addr as subnet 
-	 * and try to calculate a usable subnet mask.
-	 */
-	int byte, bit;
-	bool found = FALSE;
-	chunk_t from, to;
-	size_t size = (ts->get_type(ts) == TS_IPV4_ADDR_RANGE) ? 4 : 16;
-	
-	from = ts->get_from_address(ts);
-	to = ts->get_to_address(ts);
-	
-	*mask = (size * 8);
-	/* go trough all bits of the addresses, beginning in the front.
-	 * as long as they are equal, the subnet gets larger
-	 */
-	for (byte = 0; byte < size; byte++)
-	{
-		for (bit = 7; bit >= 0; bit--)
-		{
-			if ((1<<bit & from.ptr[byte]) != (1<<bit & to.ptr[byte]))
-			{
-				*mask = ((7 - bit) + (byte * 8));
-				found = TRUE;
-				break;
-			}
-		}
-		if (found)
-		{
-			break;
-		}
-	}
-	memcpy(net, from.ptr, from.len);
-	chunk_free(&from);
-	chunk_free(&to);
+	return this->ipsec->get_cpi(this->ipsec, src, dst, reqid, cpi);
 }
 
 /**
- * convert a traffic selector port range to port/portmask
+ * Implementation of kernel_interface_t.add_sa
  */
-static void ts2ports(traffic_selector_t* ts, 
-					 u_int16_t *port, u_int16_t *mask)
+static status_t add_sa(private_kernel_interface_t *this, host_t *src, host_t *dst,
+				u_int32_t spi, protocol_id_t protocol, u_int32_t reqid,
+				u_int64_t expire_soft, u_int64_t expire_hard,
+				u_int16_t enc_alg, u_int16_t enc_size,
+				u_int16_t int_alg, u_int16_t int_size,
+				prf_plus_t *prf_plus, ipsec_mode_t mode, u_int16_t ipcomp, bool encap,
+				bool update)
 {
-	/* linux does not seem to accept complex portmasks. Only
-	 * any or a specific port is allowed. We set to any, if we have
-	 * a port range, or to a specific, if we have one port only.
-	 */
-	u_int16_t from, to;
-	
-	from = ts->get_from_port(ts);
-	to = ts->get_to_port(ts);
-	
-	if (from == to)
-	{
-		*port = htons(from);
-		*mask = ~0;
-	}
-	else
-	{
-		*port = 0;
-		*mask = 0;
-	}
+	return this->ipsec->add_sa(this->ipsec, src, dst, spi, protocol, reqid,
+			expire_soft, expire_hard, enc_alg, enc_size, int_alg, int_size,
+			prf_plus, mode, ipcomp, encap, update);
 }
 
 /**
- * convert a pair of traffic_selectors to a xfrm_selector
+ * Implementation of kernel_interface_t.update_sa
  */
-static struct xfrm_selector ts2selector(traffic_selector_t *src, 
-										traffic_selector_t *dst)
+static status_t update_sa(private_kernel_interface_t *this, u_int32_t spi,
+				   protocol_id_t protocol, host_t *src, host_t *dst, 
+				   host_t *new_src, host_t *new_dst, bool encap)
 {
-	struct xfrm_selector sel;
-
-	memset(&sel, 0, sizeof(sel));
-	sel.family = src->get_type(src) == TS_IPV4_ADDR_RANGE ? AF_INET : AF_INET6;
-	/* src or dest proto may be "any" (0), use more restrictive one */
-	sel.proto = max(src->get_protocol(src), dst->get_protocol(dst));
-	ts2subnet(dst, &sel.daddr, &sel.prefixlen_d);
-	ts2subnet(src, &sel.saddr, &sel.prefixlen_s);
-	ts2ports(dst, &sel.dport, &sel.dport_mask);
-	ts2ports(src, &sel.sport, &sel.sport_mask);
-	sel.ifindex = 0;
-	sel.user = 0;
-	
-	return sel;
+	return this->ipsec->update_sa(this->ipsec, spi, protocol, src, dst, new_src,
+			new_dst, encap);
 }
 
 /**
- * Creates an rtattr and adds it to the netlink message
+ * Implementation of kernel_interface_t.query_sa
  */
-static void add_attribute(struct nlmsghdr *hdr, int rta_type, chunk_t data,
-						  size_t buflen)
+static status_t query_sa(private_kernel_interface_t *this, host_t *dst, u_int32_t spi, 
+				  protocol_id_t protocol, u_int32_t *use_time)
 {
-	struct rtattr *rta;
-	
-	if (NLMSG_ALIGN(hdr->nlmsg_len) + RTA_ALIGN(data.len) > buflen)
-	{
-		DBG1(DBG_KNL, "unable to add attribute, buffer too small");
-		return;
-	}
-	
-	rta = (struct rtattr*)(((char*)hdr) + NLMSG_ALIGN(hdr->nlmsg_len));
-	rta->rta_type = rta_type;
-	rta->rta_len = RTA_LENGTH(data.len);
-	memcpy(RTA_DATA(rta), data.ptr, data.len);
-	hdr->nlmsg_len = NLMSG_ALIGN(hdr->nlmsg_len) + rta->rta_len;
-}
-
-/**
- * process a XFRM_MSG_ACQUIRE from kernel
- */
-static void process_acquire(private_kernel_interface_t *this, struct nlmsghdr *hdr)
-{
-	u_int32_t reqid = 0;
-	job_t *job;
-	struct rtattr *rtattr = XFRM_RTA(hdr, struct xfrm_user_acquire);
-	size_t rtsize = XFRM_PAYLOAD(hdr, struct xfrm_user_tmpl);
-	
-	if (RTA_OK(rtattr, rtsize))
-	{
-		if (rtattr->rta_type == XFRMA_TMPL)
-		{
-			struct xfrm_user_tmpl* tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rtattr);
-			reqid = tmpl->reqid;
-		}
-	}
-	if (reqid == 0)
-	{
-		DBG1(DBG_KNL, "received a XFRM_MSG_ACQUIRE, but no reqid found");
-		return;
-	}
-	DBG2(DBG_KNL, "received a XFRM_MSG_ACQUIRE");
-	DBG1(DBG_KNL, "creating acquire job for CHILD_SA with reqid %d", reqid);
-	job = (job_t*)acquire_job_create(reqid);
-	charon->processor->queue_job(charon->processor, job);
-}
-
-/**
- * process a XFRM_MSG_EXPIRE from kernel
- */
-static void process_expire(private_kernel_interface_t *this, struct nlmsghdr *hdr)
-{
-	job_t *job;
-	protocol_id_t protocol;
-	u_int32_t spi, reqid;
-	struct xfrm_user_expire *expire;
-	
-	expire = (struct xfrm_user_expire*)NLMSG_DATA(hdr);
-	protocol = expire->state.id.proto;
-	protocol = (protocol == KERNEL_ESP) ? PROTO_ESP : (protocol == KERNEL_AH) ? PROTO_AH : protocol;
-	spi = expire->state.id.spi;
-	reqid = expire->state.reqid;
-	
-	DBG2(DBG_KNL, "received a XFRM_MSG_EXPIRE");
-	
-	if (protocol != PROTO_ESP && protocol != PROTO_AH)
-	{
-		DBG2(DBG_KNL, "ignoring XFRM_MSG_EXPIRE for SA 0x%x (reqid %d) which is "
-				"not a CHILD_SA", ntohl(spi), reqid);
-		return;
-	}
-	
-	DBG1(DBG_KNL, "creating %s job for %N CHILD_SA 0x%x (reqid %d)",
-		 expire->hard ? "delete" : "rekey",  protocol_id_names,
-		 protocol, ntohl(spi), reqid);
-	if (expire->hard)
-	{
-		job = (job_t*)delete_child_sa_job_create(reqid, protocol, spi);
-	}
-	else
-	{
-		job = (job_t*)rekey_child_sa_job_create(reqid, protocol, spi);
-	}
-	charon->processor->queue_job(charon->processor, job);
-}
-
-/**
- * start a roaming job. We delay it for a second and fire only one job
- * for multiple events. Otherwise we would create two many jobs.
- */
-static void fire_roam_job(private_kernel_interface_t *this, bool address)
-{
-	struct timeval now;
-		
-	if (gettimeofday(&now, NULL) == 0)
-	{
-		if (timercmp(&now, &this->last_roam, >))
-		{
-			now.tv_usec += ROAM_DELAY * 1000;
-			while (now.tv_usec > 1000000)
-			{
-				now.tv_sec++;
-				now.tv_usec -= 1000000;
-			}
-			this->last_roam = now;
-			charon->scheduler->schedule_job(charon->scheduler,
-					(job_t*)roam_job_create(address), ROAM_DELAY);
-		}
-	}
-}
-
-/**
- * process RTM_NEWLINK/RTM_DELLINK from kernel
- */
-static void process_link(private_kernel_interface_t *this,
-						 struct nlmsghdr *hdr, bool event)
-{
-	struct ifinfomsg* msg = (struct ifinfomsg*)(NLMSG_DATA(hdr));
-	struct rtattr *rta = IFLA_RTA(msg);
-	size_t rtasize = IFLA_PAYLOAD (hdr);
-	iterator_t *iterator;
-	iface_entry_t *current, *entry = NULL;
-	char *name = NULL;
-	bool update = FALSE;
-	
-	while(RTA_OK(rta, rtasize))
-	{
-		switch (rta->rta_type)
-		{
-			case IFLA_IFNAME:
-				name = RTA_DATA(rta);
-				break;
-		}
-		rta = RTA_NEXT(rta, rtasize);
-	}
-	if (!name)
-	{
-		name = "(unknown)";
-	}
-	
-	switch (hdr->nlmsg_type)
-	{
-		case RTM_NEWLINK:
-		{
-			if (msg->ifi_flags & IFF_LOOPBACK)
-			{	/* ignore loopback interfaces */
-				break;
-			}
-			iterator = this->ifaces->create_iterator_locked(this->ifaces,
-															&this->mutex);
-			while (iterator->iterate(iterator, (void**)&current))
-			{
-				if (current->ifindex == msg->ifi_index)
-				{
-					entry = current;
-					break;
-				}
-			}
-			if (!entry)
-			{
-				entry = malloc_thing(iface_entry_t);
-				entry->ifindex = msg->ifi_index;
-				entry->flags = 0;
-				entry->addrs = linked_list_create();
-				this->ifaces->insert_last(this->ifaces, entry);
-			}
-			memcpy(entry->ifname, name, IFNAMSIZ);
-			entry->ifname[IFNAMSIZ-1] = '\0';
-			if (event)
-			{
-				if (!(entry->flags & IFF_UP) && (msg->ifi_flags & IFF_UP))
-				{
-					update = TRUE;
-					DBG1(DBG_KNL, "interface %s activated", name);
-				}
-				if ((entry->flags & IFF_UP) && !(msg->ifi_flags & IFF_UP))
-				{
-					update = TRUE;
-					DBG1(DBG_KNL, "interface %s deactivated", name);
-				}
-			}
-			entry->flags = msg->ifi_flags;
-			iterator->destroy(iterator);
-			break;
-		}
-		case RTM_DELLINK:
-		{
-			iterator = this->ifaces->create_iterator_locked(this->ifaces,
-															&this->mutex);
-			while (iterator->iterate(iterator, (void**)&current))
-			{
-				if (current->ifindex == msg->ifi_index)
-				{
-					/* we do not remove it, as an address may be added to a 
-					 * "down" interface and we wan't to know that. */
-					current->flags = msg->ifi_flags;
-					break;
-				}
-			}
-			iterator->destroy(iterator);
-			break;
-		}
-	}
-	
-	/* send an update to all IKE_SAs */
-	if (update && event)
-	{
-		fire_roam_job(this, TRUE);
-	}
-}
-
-/**
- * process RTM_NEWADDR/RTM_DELADDR from kernel
- */
-static void process_addr(private_kernel_interface_t *this,
-						 struct nlmsghdr *hdr, bool event)
-{
-	struct ifaddrmsg* msg = (struct ifaddrmsg*)(NLMSG_DATA(hdr));
-	struct rtattr *rta = IFA_RTA(msg);
-	size_t rtasize = IFA_PAYLOAD (hdr);
-	host_t *host = NULL;
-	iterator_t *ifaces, *addrs;
-	iface_entry_t *iface;
-	addr_entry_t *addr;
-	chunk_t local = chunk_empty, address = chunk_empty;
-	bool update = FALSE, found = FALSE, changed = FALSE;
-	
-	while(RTA_OK(rta, rtasize))
-	{
-		switch (rta->rta_type)
-		{
-			case IFA_LOCAL:
-				local.ptr = RTA_DATA(rta);
-				local.len = RTA_PAYLOAD(rta);
-				break;
-			case IFA_ADDRESS:
-				address.ptr = RTA_DATA(rta);
-				address.len = RTA_PAYLOAD(rta);
-				break;
-		}
-		rta = RTA_NEXT(rta, rtasize);
-	}
-	
-	/* For PPP interfaces, we need the IFA_LOCAL address,
-	 * IFA_ADDRESS is the peers address. But IFA_LOCAL is
-	 * not included in all cases (IPv6?), so fallback to IFA_ADDRESS. */
-	if (local.ptr)
-	{
-		host = host_create_from_chunk(msg->ifa_family, local, 0);
-	}
-	else if (address.ptr)
-	{
-		host = host_create_from_chunk(msg->ifa_family, address, 0);
-	}
-	
-	if (host == NULL)
-	{	/* bad family? */
-		return;
-	}
-	
-	ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
-	while (ifaces->iterate(ifaces, (void**)&iface))
-	{
-		if (iface->ifindex == msg->ifa_index)
-		{
-			addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
-			while (addrs->iterate(addrs, (void**)&addr))
-			{
-				if (host->ip_equals(host, addr->ip))
-				{
-					found = TRUE;
-					if (hdr->nlmsg_type == RTM_DELADDR)
-					{
-						changed = TRUE;
-						addrs->remove(addrs);
-						if (!addr->virtual)
-						{
-							DBG1(DBG_KNL, "%H disappeared from %s",
-								 host, iface->ifname);
-						}
-						addr_entry_destroy(addr);
-					}
-					else if (hdr->nlmsg_type == RTM_NEWADDR && addr->virtual)
-					{
-						addr->refcount = 1;
-					}
-				}
-			}
-			addrs->destroy(addrs);
-		
-			if (hdr->nlmsg_type == RTM_NEWADDR)
-			{
-				if (!found)
-				{
-					found = TRUE;
-					changed = TRUE;
-					addr = malloc_thing(addr_entry_t);
-					addr->ip = host->clone(host);
-					addr->virtual = FALSE;
-					addr->refcount = 1;
-					addr->scope = msg->ifa_scope;
-					
-					iface->addrs->insert_last(iface->addrs, addr);
-					if (event)
-					{
-						DBG1(DBG_KNL, "%H appeared on %s", host, iface->ifname);
-					}
-				}
-			}
-			if (found && (iface->flags & IFF_UP))
-			{
-				update = TRUE;
-			}
-			break;
-		}
-	}
-	ifaces->destroy(ifaces);
-	host->destroy(host);
-	
-	/* send an update to all IKE_SAs */
-	if (update && event && changed)
-	{
-		fire_roam_job(this, TRUE);
-	}
-}
-
-/**
- * Receives events from kernel
- */
-static job_requeue_t receive_events(private_kernel_interface_t *this)
-{
-	char response[1024];
-	struct nlmsghdr *hdr = (struct nlmsghdr*)response;
-	struct sockaddr_nl addr;
-	socklen_t addr_len = sizeof(addr);
-	int len, oldstate, maxfd, selected;
-	fd_set rfds;
-
-	FD_ZERO(&rfds);
-	FD_SET(this->socket_xfrm_events, &rfds);
-	FD_SET(this->socket_rt_events, &rfds);
-	maxfd = max(this->socket_xfrm_events, this->socket_rt_events);
-	
-	pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldstate);
-	selected = select(maxfd + 1, &rfds, NULL, NULL, NULL);
-	pthread_setcancelstate(oldstate, NULL);
-	if (selected <= 0)
-	{
-		DBG1(DBG_KNL, "selecting on sockets failed: %s", strerror(errno));
-		return JOB_REQUEUE_FAIR;
-	}
-	if (FD_ISSET(this->socket_xfrm_events, &rfds))
-	{
-		selected = this->socket_xfrm_events;
-	}
-	else if (FD_ISSET(this->socket_rt_events, &rfds))
-	{
-		selected = this->socket_rt_events;
-	}
-	else
-	{
-		return JOB_REQUEUE_DIRECT;
-	}
-	
-	len = recvfrom(selected, response, sizeof(response), MSG_DONTWAIT,
-				   (struct sockaddr*)&addr, &addr_len);
-	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 xfrm event socket");
-				sleep(1);
-				return JOB_REQUEUE_FAIR;
-		}
-	}
-	if (addr.nl_pid != 0)
-	{	/* not from kernel. not interested, try another one */
-		return JOB_REQUEUE_DIRECT;
-	}
-	
-	while (NLMSG_OK(hdr, len))
-	{
-		/* looks good so far, dispatch netlink message */
-		if (selected == this->socket_xfrm_events)
-		{
-			switch (hdr->nlmsg_type)
-			{
-				case XFRM_MSG_ACQUIRE:
-					process_acquire(this, hdr);
-					break;
-				case XFRM_MSG_EXPIRE:
-					process_expire(this, hdr);
-					break;
-				default:
-					break;
-			}
-		}
-		else if (selected == this->socket_rt_events)
-		{
-			switch (hdr->nlmsg_type)
-			{
-				case RTM_NEWADDR:
-				case RTM_DELADDR:
-					process_addr(this, hdr, TRUE);
-					pthread_cond_signal(&this->cond);
-					break;
-				case RTM_NEWLINK:
-				case RTM_DELLINK:
-					process_link(this, hdr, TRUE);
-					pthread_cond_signal(&this->cond);
-					break;
-				case RTM_NEWROUTE:
-				case RTM_DELROUTE:
-					fire_roam_job(this, FALSE);
-					break;
-				default:
-					break;
-			}
-		}
-		hdr = NLMSG_NEXT(hdr, len);
-	}
-	return JOB_REQUEUE_DIRECT;
+	return this->ipsec->query_sa(this->ipsec, dst, spi, protocol, use_time);
 }
 
 /**
- * send a netlink message and wait for a reply
+ * Implementation of kernel_interface_t.del_sa
  */
-static status_t netlink_send(private_kernel_interface_t *this,
-							 int socket, struct nlmsghdr *in,
-							 struct nlmsghdr **out, size_t *out_len)
+static status_t del_sa(private_kernel_interface_t *this, host_t *dst, u_int32_t spi,
+				protocol_id_t protocol)
 {
-	int len, addr_len;
-	struct sockaddr_nl addr;
-	chunk_t result = chunk_empty, tmp;
-	struct nlmsghdr *msg, peek;
-	
-	pthread_mutex_lock(&this->nl_mutex);
-	
-	in->nlmsg_seq = ++this->seq;
-	in->nlmsg_pid = getpid();
-	
-	memset(&addr, 0, sizeof(addr));
-	addr.nl_family = AF_NETLINK;
-	addr.nl_pid = 0;
-	addr.nl_groups = 0;
-
-	while (TRUE)
-	{
-		len = sendto(socket, in, in->nlmsg_len, 0, 
-					 (struct sockaddr*)&addr, sizeof(addr));
-		
-		if (len != in->nlmsg_len)
-		{	
-			if (errno == EINTR)
-			{
-				/* interrupted, try again */
-				continue;
-			}
-			pthread_mutex_unlock(&this->nl_mutex);
-			DBG1(DBG_KNL, "error sending to netlink socket: %s", strerror(errno));
-			return FAILED;
-		}
-		break;
-	}
-	
-	while (TRUE)
-	{	
-		char buf[4096];
-		tmp.len = sizeof(buf);
-		tmp.ptr = buf;
-		msg = (struct nlmsghdr*)tmp.ptr;
-		
-		memset(&addr, 0, sizeof(addr));
-		addr.nl_family = AF_NETLINK;
-		addr.nl_pid = getpid();
-		addr.nl_groups = 0;
-		addr_len = sizeof(addr);
-		
-		len = recvfrom(socket, tmp.ptr, tmp.len, 0,
-					   (struct sockaddr*)&addr, &addr_len);
-		
-		if (len < 0)
-		{
-			if (errno == EINTR)
-			{
-				DBG1(DBG_KNL, "got interrupted");
-				/* interrupted, try again */
-				continue;
-			}
-			DBG1(DBG_KNL, "error reading from netlink socket: %s", strerror(errno));
-			pthread_mutex_unlock(&this->nl_mutex);
-			return FAILED;
-		}
-		if (!NLMSG_OK(msg, len))
-		{
-			DBG1(DBG_KNL, "received corrupted netlink message");
-			pthread_mutex_unlock(&this->nl_mutex);
-			return FAILED;
-		}
-		if (msg->nlmsg_seq != this->seq)
-		{
-			DBG1(DBG_KNL, "received invalid netlink sequence number");
-			if (msg->nlmsg_seq < this->seq)
-			{
-				continue;
-			}
-			pthread_mutex_unlock(&this->nl_mutex);
-			return FAILED;
-		}
-		
-		tmp.len = len;
-		result = chunk_cata("cc", result, tmp);
-		
-		/* NLM_F_MULTI flag does not seem to be set correctly, we use sequence
-		 * numbers to detect multi header messages */
-		len = recvfrom(socket, &peek, sizeof(peek), MSG_PEEK | MSG_DONTWAIT,
-					   (struct sockaddr*)&addr, &addr_len);
-		
-		if (len == sizeof(peek) && peek.nlmsg_seq == this->seq)
-		{
-			/* seems to be multipart */
-			continue;
-		}
-		break;
-	}
-	
-	*out_len = result.len;
-	*out = (struct nlmsghdr*)clalloc(result.ptr, result.len);
-	
-	pthread_mutex_unlock(&this->nl_mutex);
-	
-	return SUCCESS;
+	return this->ipsec->del_sa(this->ipsec, dst, spi, protocol);
 }
 
 /**
- * send a netlink message and wait for its acknowlegde
+ * Implementation of kernel_interface_t.add_policy
  */
-static status_t netlink_send_ack(private_kernel_interface_t *this,
-								 int socket, struct nlmsghdr *in)
+static status_t add_policy(private_kernel_interface_t *this, host_t *src, host_t *dst,
+					traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
+					policy_dir_t direction, protocol_id_t protocol,
+					u_int32_t reqid, bool high_prio, ipsec_mode_t mode,
+					u_int16_t ipcomp)
 {
-	struct nlmsghdr *out, *hdr;
-	size_t len;
-
-	if (netlink_send(this, socket, in, &out, &len) != SUCCESS)
-	{
-		return FAILED;
-	}
-	hdr = out;
-	while (NLMSG_OK(hdr, len))
-	{
-		switch (hdr->nlmsg_type)
-		{
-			case NLMSG_ERROR:
-			{
-				struct nlmsgerr* err = (struct nlmsgerr*)NLMSG_DATA(hdr);
-				
-				if (err->error)
-				{
-					DBG1(DBG_KNL, "received netlink error: %s (%d)",
-						 strerror(-err->error), -err->error);
-					free(out);
-					return FAILED;
-				}
-				free(out);
-				return SUCCESS;
-			}
-			default:
-				hdr = NLMSG_NEXT(hdr, len);
-				continue;
-			case NLMSG_DONE:
-				break;
-		}
-		break;
-	}
-	DBG1(DBG_KNL, "netlink request not acknowlegded");
-	free(out);
-	return FAILED;
+	return this->ipsec->add_policy(this->ipsec, src, dst, src_ts, dst_ts,
+			direction, protocol, reqid, high_prio, mode, ipcomp);
 }
-	
-/**
- * Initialize a list of local addresses.
- */
-static status_t init_address_list(private_kernel_interface_t *this)
-{
-	char request[BUFFER_SIZE];
-	struct nlmsghdr *out, *current, *in;
-	struct rtgenmsg *msg;
-	size_t len;
-	iterator_t *ifaces, *addrs;
-	iface_entry_t *iface;
-	addr_entry_t *addr;
-	
-	DBG1(DBG_KNL, "listening on interfaces:");
-	
-	memset(&request, 0, sizeof(request));
 
-	in = (struct nlmsghdr*)&request;
-	in->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
-	in->nlmsg_flags = NLM_F_REQUEST | NLM_F_MATCH | NLM_F_ROOT;
-	msg = (struct rtgenmsg*)NLMSG_DATA(in);
-	msg->rtgen_family = AF_UNSPEC;
-	
-	/* get all links */
-	in->nlmsg_type = RTM_GETLINK;
-	if (netlink_send(this, this->socket_rt, in, &out, &len) != SUCCESS)
-	{
-		return FAILED;
-	}
-	current = out;
-	while (NLMSG_OK(current, len))
-	{
-		switch (current->nlmsg_type)
-		{
-			case NLMSG_DONE:
-				break;
-			case RTM_NEWLINK:
-				process_link(this, current, FALSE);
-				/* fall through */
-			default:
-				current = NLMSG_NEXT(current, len);
-				continue;
-		}
-		break;
-	}
-	free(out);
-	
-	/* get all interface addresses */
-	in->nlmsg_type = RTM_GETADDR;
-	if (netlink_send(this, this->socket_rt, in, &out, &len) != SUCCESS)
-	{
-		return FAILED;
-	}
-	current = out;
-	while (NLMSG_OK(current, len))
-	{
-		switch (current->nlmsg_type)
-		{
-			case NLMSG_DONE:
-				break;
-			case RTM_NEWADDR:
-				process_addr(this, current, FALSE);
-				/* fall through */
-			default:
-				current = NLMSG_NEXT(current, len);
-				continue;
-		}
-		break;
-	}
-	free(out);
-	
-	ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
-	while (ifaces->iterate(ifaces, (void**)&iface))
-	{
-		if (iface->flags & IFF_UP)
-		{
-			DBG1(DBG_KNL, "  %s", iface->ifname);
-			addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
-			while (addrs->iterate(addrs, (void**)&addr))
-			{
-				DBG1(DBG_KNL, "    %H", addr->ip);
-			}
-			addrs->destroy(addrs);
-		}
-	}
-	ifaces->destroy(ifaces);
-	return SUCCESS;
-}
-
-/**
- * iterator hook to iterate over addrs
- */
-static hook_result_t addr_hook(private_kernel_interface_t *this,
-							   addr_entry_t *in, host_t **out)
-{
-	if (in->virtual)
-	{	/* skip virtual interfaces added by us */
-		return HOOK_SKIP;
-	}
-	if (in->scope >= RT_SCOPE_LINK)
-	{	/* skip addresses with a unusable scope */
-		return HOOK_SKIP;
-	}
-	*out = in->ip;
-	return HOOK_NEXT;
-}
-								
 /**
- * iterator hook to iterate over ifaces
+ * Implementation of kernel_interface_t.query_policy
  */
-static hook_result_t iface_hook(private_kernel_interface_t *this,
-								iface_entry_t *in, host_t **out)
-{
-	if (!(in->flags & IFF_UP))
-	{	/* skip interfaces not up */
-		return HOOK_SKIP;
-	}
-
-	if (this->hiter == NULL)
-	{
-		this->hiter = in->addrs->create_iterator(in->addrs, TRUE);
-		this->hiter->set_iterator_hook(this->hiter,
-									   (iterator_hook_t*)addr_hook, this);
-	}
-	while (this->hiter->iterate(this->hiter, (void**)out))
-	{
-		return HOOK_AGAIN;
-	}
-	this->hiter->destroy(this->hiter);
-	this->hiter = NULL;
-	return HOOK_SKIP;
-}
-
-/**
- * Implements kernel_interface_t.create_address_iterator.
- */
-static iterator_t *create_address_iterator(private_kernel_interface_t *this)
-{
-	iterator_t *iterator;
-	
-	/* This iterator is not only hooked, is is double-hooked. As we have stored
-	 * our addresses in iface_entry->addr_entry->ip, we need to iterate the
-	 * entries in each interface we iterate. This does the iface_hook. The
-	 * addr_hook returns the ip instead of the addr_entry. */
-	
-	iterator = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
-	iterator->set_iterator_hook(iterator, (iterator_hook_t*)iface_hook, this);
-	return iterator;
-}
-
-/**
- * implementation of kernel_interface_t.get_interface_name
- */
-static char *get_interface_name(private_kernel_interface_t *this, host_t* ip)
-{
-	iterator_t *ifaces, *addrs;
-	iface_entry_t *iface;
-	addr_entry_t *addr;
-	char *name = NULL;
-	
-	DBG2(DBG_KNL, "getting interface name for %H", ip);
-	
-	ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
-	while (ifaces->iterate(ifaces, (void**)&iface))
-	{
-		addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
-		while (addrs->iterate(addrs, (void**)&addr))
-		{
-			if (ip->ip_equals(ip, addr->ip))
-			{
-				name = strdup(iface->ifname);
-				break;
-			}
-		}
-		addrs->destroy(addrs);
-		if (name)
-		{
-			break;
-		}
-	}
-	ifaces->destroy(ifaces);
-	
-	if (name)
-	{
-		DBG2(DBG_KNL, "%H is on interface %s", ip, name);
-	}
-	else
-	{
-		DBG2(DBG_KNL, "%H is not a local address", ip);
-	}
-	return name;
-}
-
-/**
- * Tries to find an ip address of a local interface that is included in the
- * supplied traffic selector.
- */
-static status_t get_address_by_ts(private_kernel_interface_t *this,
-								  traffic_selector_t *ts, host_t **ip)
-{
-	iterator_t *ifaces, *addrs;
-	iface_entry_t *iface;
-	addr_entry_t *addr;
-	host_t *host;
-	int family;
-	bool found = FALSE;
-	
-	DBG2(DBG_KNL, "getting a local address in traffic selector %R", ts);
-	
-	/* if we have a family which includes localhost, we do not
-	 * search for an IP, we use the default */
-	family = ts->get_type(ts) == TS_IPV4_ADDR_RANGE ? AF_INET : AF_INET6;
-	
-	if (family == AF_INET)
-	{
-		host = host_create_from_string("127.0.0.1", 0);
-	}
-	else
-	{
-		host = host_create_from_string("::1", 0);
-	}
-	
-	if (ts->includes(ts, host))
-	{
-		*ip = host_create_any(family);
-		host->destroy(host);
-		DBG2(DBG_KNL, "using host %H", *ip);
-		return SUCCESS;
-	}
-	host->destroy(host);
-	
-	ifaces = this->ifaces->create_iterator_locked(this->ifaces,	&this->mutex);
-	while (ifaces->iterate(ifaces, (void**)&iface))
-	{
-		addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
-		while (addrs->iterate(addrs, (void**)&addr))
-		{
-			if (ts->includes(ts, addr->ip))
-			{
-				found = TRUE;
-				*ip = addr->ip->clone(addr->ip);
-				break;
-			}
-		}
-		addrs->destroy(addrs);
-		if (found)
-		{
-			break;
-		}
-	}
-	ifaces->destroy(ifaces);
-	
-	if (!found)
-	{
-		DBG1(DBG_KNL, "no local address found in traffic selector %R", ts);
-		return FAILED;
-	}
-	DBG2(DBG_KNL, "using host %H", *ip);
-	return SUCCESS;
-}
-
-/**
- * get the interface of a local address
- */
-static int get_interface_index(private_kernel_interface_t *this, host_t* ip)
-{
-	iterator_t *ifaces, *addrs;
-	iface_entry_t *iface;
-	addr_entry_t *addr;
-	int ifindex = 0;
-	
-	DBG2(DBG_KNL, "getting iface for %H", ip);
-	
-	ifaces = this->ifaces->create_iterator_locked(this->ifaces,	&this->mutex);
-	while (ifaces->iterate(ifaces, (void**)&iface))
-	{
-		addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
-		while (addrs->iterate(addrs, (void**)&addr))
-		{
-			if (ip->ip_equals(ip, addr->ip))
-			{
-				ifindex = iface->ifindex;
-				break;
-			}
-		}
-		addrs->destroy(addrs);
-		if (ifindex)
-		{
-			break;
-		}
-	}
-	ifaces->destroy(ifaces);
-
-	if (ifindex == 0)
-	{
-		DBG1(DBG_KNL, "unable to get interface for %H", ip);
-	}
-	return ifindex;
-}
-
-/**
- * get the refcount of a virtual ip
- */
-static int get_vip_refcount(private_kernel_interface_t *this, host_t* ip)
-{
-	iterator_t *ifaces, *addrs;
-	iface_entry_t *iface;
-	addr_entry_t *addr;
-	int refcount = 0;
-	
-	ifaces = this->ifaces->create_iterator(this->ifaces, TRUE);
-	while (ifaces->iterate(ifaces, (void**)&iface))
-	{
-		addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
-		while (addrs->iterate(addrs, (void**)&addr))
-		{
-			if (addr->virtual && (iface->flags & IFF_UP) &&
-				ip->ip_equals(ip, addr->ip))
-			{
-				refcount = addr->refcount;
-				break;
-			}
-		}
-		addrs->destroy(addrs);
-		if (refcount)
-		{
-			break;
-		}
-	}
-	ifaces->destroy(ifaces);
-	
-	return refcount;
-}
-
-/**
- * Manages the creation and deletion of ip addresses on an interface.
- * By setting the appropriate nlmsg_type, the ip will be set or unset.
- */
-static status_t manage_ipaddr(private_kernel_interface_t *this, int nlmsg_type,
-							  int flags, int if_index, host_t *ip)
+static status_t query_policy(private_kernel_interface_t *this,
+					  traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
+					  policy_dir_t direction, u_int32_t *use_time)
 {
-	unsigned char request[BUFFER_SIZE];
-	struct nlmsghdr *hdr;
-	struct ifaddrmsg *msg;
-	chunk_t chunk;
-	
-	memset(&request, 0, sizeof(request));
-	
-	chunk = ip->get_address(ip);
-    
-    hdr = (struct nlmsghdr*)request;
-	hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
-	hdr->nlmsg_type = nlmsg_type; 
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
-	
-	msg = (struct ifaddrmsg*)NLMSG_DATA(hdr);
-    msg->ifa_family = ip->get_family(ip);
-    msg->ifa_flags = 0;
-    msg->ifa_prefixlen = 8 * chunk.len;
-    msg->ifa_scope = RT_SCOPE_UNIVERSE;
-    msg->ifa_index = if_index;
-	
-	add_attribute(hdr, IFA_LOCAL, chunk, sizeof(request));
-
-	return netlink_send_ack(this, this->socket_rt, hdr);
+	return this->ipsec->query_policy(this->ipsec, src_ts, dst_ts, direction, use_time);
 }
 
 /**
- * Manages source routes in the routing table.
- * By setting the appropriate nlmsg_type, the route added or r.
+ * Implementation of kernel_interface_t.del_policy
  */
-static status_t manage_srcroute(private_kernel_interface_t *this, int nlmsg_type,
-								int flags, route_entry_t *route)
+static status_t del_policy(private_kernel_interface_t *this,
+					traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
+					policy_dir_t direction)
 {
-	unsigned char request[BUFFER_SIZE];
-	struct nlmsghdr *hdr;
-	struct rtmsg *msg;
-	chunk_t chunk;
-
-	/* if route is 0.0.0.0/0, we can't install it, as it would
-	 * overwrite the default route. Instead, we add two routes:
-	 * 0.0.0.0/1 and 128.0.0.0/1 */
-	if (this->routing_table == 0 && route->prefixlen == 0)
-	{
-		route_entry_t half;
-		status_t status;
-		
-		half.dst_net = chunk_alloca(route->dst_net.len);
-		memset(half.dst_net.ptr, 0, half.dst_net.len);
-		half.src_ip = route->src_ip;
-		half.gateway = route->gateway;
-		half.if_index = route->if_index;
-		half.prefixlen = 1;
-		
-		status = manage_srcroute(this, nlmsg_type, flags, &half);
-		half.dst_net.ptr[0] |= 0x80;
-		status = manage_srcroute(this, nlmsg_type, flags, &half);
-		return status;
-	}
-	
-	memset(&request, 0, sizeof(request));
-
-	hdr = (struct nlmsghdr*)request;
-	hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
-	hdr->nlmsg_type = nlmsg_type;
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
-
-	msg = (struct rtmsg*)NLMSG_DATA(hdr);
-	msg->rtm_family = route->src_ip->get_family(route->src_ip);
-	msg->rtm_dst_len = route->prefixlen;
-	msg->rtm_table = this->routing_table;
-	msg->rtm_protocol = RTPROT_STATIC;
-	msg->rtm_type = RTN_UNICAST;
-	msg->rtm_scope = RT_SCOPE_UNIVERSE;
-	
-	add_attribute(hdr, RTA_DST, route->dst_net, sizeof(request));
-	chunk = route->src_ip->get_address(route->src_ip);
-	add_attribute(hdr, RTA_PREFSRC, chunk, sizeof(request));
-	chunk = route->gateway->get_address(route->gateway);
-	add_attribute(hdr, RTA_GATEWAY, chunk, sizeof(request));
-	chunk.ptr = (char*)&route->if_index;
-	chunk.len = sizeof(route->if_index);
-	add_attribute(hdr, RTA_OIF, chunk, sizeof(request));
-
-	return netlink_send_ack(this, this->socket_rt, hdr);
+	return this->ipsec->del_policy(this->ipsec, src_ts, dst_ts, direction);
 }
 
 /**
- * create or delete an rule to use our routing table
+ * Implementation of kernel_interface_t.get_source_addr
  */
-static status_t manage_rule(private_kernel_interface_t *this, int nlmsg_type,
-							u_int32_t table, u_int32_t prio)
+static host_t *get_source_addr(private_kernel_interface_t *this,
+							   host_t *dest, host_t *src)
 {
-	unsigned char request[BUFFER_SIZE];
-	struct nlmsghdr *hdr;
-	struct rtmsg *msg;
-	chunk_t chunk;
-
-	memset(&request, 0, sizeof(request));    
-	hdr = (struct nlmsghdr*)request;
-	hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
-	hdr->nlmsg_type = nlmsg_type; 
-	if (nlmsg_type == RTM_NEWRULE)
-	{
-		hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
-	}
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
-
-	msg = (struct rtmsg*)NLMSG_DATA(hdr);
-	msg->rtm_table = table;
-	msg->rtm_family = AF_INET;
-	msg->rtm_protocol = RTPROT_BOOT;
-	msg->rtm_scope = RT_SCOPE_UNIVERSE;
-	msg->rtm_type = RTN_UNICAST;
-
-	chunk = chunk_from_thing(prio);
-	add_attribute(hdr, RTA_PRIORITY, chunk, sizeof(request));
-
-	return netlink_send_ack(this, this->socket_rt, hdr);
+	return this->net->get_source_addr(this->net, dest, src);
 }
 
 /**
- * check if an address (chunk) addr is in subnet (net with net_len net bits)
+ * Implementation of kernel_interface_t.get_nexthop
  */
-static bool addr_in_subnet(chunk_t addr, chunk_t net, int net_len)
+static host_t *get_nexthop(private_kernel_interface_t *this, host_t *dest)
 {
-	int bit, byte;
-
-	if (addr.len != net.len)
-	{
-		return FALSE;
-	}
-	/* scan through all bits, beginning in the front */
-	for (byte = 0; byte < addr.len; byte++)
-	{
-		for (bit = 7; bit >= 0; bit--)
-		{
-			/* check if bits are equal (or we reached the end of the net) */
-			if (bit + byte * 8 > net_len)
-			{
-				return TRUE;
-			}
-			if (((1<<bit) & addr.ptr[byte]) != ((1<<bit) & net.ptr[byte]))
-			{
-				return FALSE;
-			}
-		}
-	}
-	return TRUE;
+	return this->net->get_nexthop(this->net, dest);
 }
 
 /**
- * Get a route: If "nexthop", the nexthop is returned. source addr otherwise.
+ * Implementation of kernel_interface_t.get_interface
  */
-static host_t *get_route(private_kernel_interface_t *this, host_t *dest,
-						 bool nexthop)
+static char* get_interface(private_kernel_interface_t *this, host_t *host)
 {
-	unsigned char request[BUFFER_SIZE];
-	struct nlmsghdr *hdr, *out, *current;
-	struct rtmsg *msg;
-	chunk_t chunk;
-	size_t len;
-	int best = -1;
-	host_t *src = NULL, *gtw = NULL;
-	
-	DBG2(DBG_KNL, "getting address to reach %H", dest);
-	
-	memset(&request, 0, sizeof(request));
-
-	hdr = (struct nlmsghdr*)request;
-	hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP | NLM_F_ROOT;
-	hdr->nlmsg_type = RTM_GETROUTE;
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
-
-	msg = (struct rtmsg*)NLMSG_DATA(hdr);
-	msg->rtm_family = dest->get_family(dest);
-	
-	chunk = dest->get_address(dest);
-	add_attribute(hdr, RTA_DST, chunk, sizeof(request));
-			
-	if (netlink_send(this, this->socket_rt, hdr, &out, &len) != SUCCESS)
-	{
-		DBG1(DBG_KNL, "getting address to %H failed", dest);
-		return NULL;
-	}
-	current = out;
-	while (NLMSG_OK(current, len))
-	{
-		switch (current->nlmsg_type)
-		{
-			case NLMSG_DONE:
-				break;
-			case RTM_NEWROUTE:
-			{
-				struct rtattr *rta;
-				size_t rtasize;
-				chunk_t rta_gtw, rta_src, rta_dst;
-				u_int32_t rta_oif = 0;
-				
-				rta_gtw = rta_src = rta_dst = chunk_empty;
-				msg = (struct rtmsg*)(NLMSG_DATA(current));
-				rta = RTM_RTA(msg);
-				rtasize = RTM_PAYLOAD(current);
-				while (RTA_OK(rta, rtasize))
-				{
-					switch (rta->rta_type)
-					{
-						case RTA_PREFSRC:
-							rta_src = chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta));
-							break;
-						case RTA_GATEWAY:
-							rta_gtw = chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta));
-							break;
-						case RTA_DST:
-							rta_dst = chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta));
-							break;
-						case RTA_OIF:
-							if (RTA_PAYLOAD(rta) == sizeof(rta_oif))
-							{
-								rta_oif = *(u_int32_t*)RTA_DATA(rta);
-							}
-							break;
-					}
-					rta = RTA_NEXT(rta, rtasize);
-				}
-				
-				/* apply the route if:
-				 * - it is not from our own ipsec routing table
-				 * - is better than a previous one
-				 * - is the default route or
-				 * - its destination net contains our destination
-				 */
-				if ((this->routing_table == 0 ||msg->rtm_table != this->routing_table)
-					&&  msg->rtm_dst_len > best
-					&& (msg->rtm_dst_len == 0 || /* default route */
-					(rta_dst.ptr && addr_in_subnet(chunk, rta_dst, msg->rtm_dst_len))))
-				{
-					iterator_t *ifaces, *addrs;
-					iface_entry_t *iface;
-					addr_entry_t *addr;
-					
-					best = msg->rtm_dst_len;
-					if (nexthop)
-					{
-						DESTROY_IF(gtw);
-						gtw = host_create_from_chunk(msg->rtm_family, rta_gtw, 0);
-					}
-					else if (rta_src.ptr)
-					{
-						DESTROY_IF(src);
-						src = host_create_from_chunk(msg->rtm_family, rta_src, 0);
-						if (get_vip_refcount(this, src))
-						{	/* skip source address if it is installed by us */
-							DESTROY_IF(src);
-							src = NULL;
-							current = NLMSG_NEXT(current, len);
-							continue;
-						}
-					}
-					else
-					{
-						/* no source addr, get one from the interfaces */
-						ifaces = this->ifaces->create_iterator_locked(
-													this->ifaces, &this->mutex);
-						while (ifaces->iterate(ifaces, (void**)&iface))
-						{
-							if (iface->ifindex == rta_oif)
-							{
-								addrs = iface->addrs->create_iterator(
-															iface->addrs, TRUE);
-								while (addrs->iterate(addrs, (void**)&addr))
-								{
-									chunk_t ip = addr->ip->get_address(addr->ip);
-									if (msg->rtm_dst_len == 0
-									||	addr_in_subnet(ip, rta_dst, msg->rtm_dst_len))
-									{
-										DESTROY_IF(src);
-										src = addr->ip->clone(addr->ip);
-										break;
-									}
-								}
-								addrs->destroy(addrs);
-							}
-						}
-						ifaces->destroy(ifaces);
-					}
-				}
-				/* FALL through */
-			}
-			default:
-				current = NLMSG_NEXT(current, len);
-				continue;
-		}
-		break;
-	}
-	free(out);
-	
-	if (nexthop)
-	{
-		if (gtw)
-		{
-			return gtw;
-		}
-		return dest->clone(dest);
-	}
-	return src;
+	return this->net->get_interface(this->net, host);
 }
 
 /**
- * Implementation of kernel_interface_t.get_source_addr.
+ * Implementation of kernel_interface_t.create_address_enumerator
  */
-static host_t* get_source_addr(private_kernel_interface_t *this, host_t *dest)
+static enumerator_t *create_address_enumerator(private_kernel_interface_t *this,
+		bool include_down_ifaces, bool include_virtual_ips)
 {
-	return get_route(this, dest, FALSE);
+	return this->net->create_address_enumerator(this->net, include_down_ifaces,
+			include_virtual_ips);
 }
 
 /**
- * Implementation of kernel_interface_t.add_ip.
+ * Implementation of kernel_interface_t.add_ip
  */
-static status_t add_ip(private_kernel_interface_t *this, 
-						host_t *virtual_ip, host_t *iface_ip)
+static status_t add_ip(private_kernel_interface_t *this, host_t *virtual_ip,
+				host_t *iface_ip)
 {
-	iface_entry_t *iface;
-	addr_entry_t *addr;
-	iterator_t *addrs, *ifaces;
-	int ifindex;
-
-	DBG2(DBG_KNL, "adding virtual IP %H", virtual_ip);
-	
-	ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
-	while (ifaces->iterate(ifaces, (void**)&iface))
-	{
-		bool iface_found = FALSE;
-	
-		addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
-		while (addrs->iterate(addrs, (void**)&addr))
-		{
-			if (iface_ip->ip_equals(iface_ip, addr->ip))
-			{
-				iface_found = TRUE;
-			}
-			else if (virtual_ip->ip_equals(virtual_ip, addr->ip))
-			{
-				addr->refcount++;
-				DBG2(DBG_KNL, "virtual IP %H already installed on %s",
-					 virtual_ip, iface->ifname);
-				addrs->destroy(addrs);
-				ifaces->destroy(ifaces);
-				return SUCCESS;
-			}
-		}
-		addrs->destroy(addrs);
-		
-		if (iface_found)
-		{
-			ifindex = iface->ifindex;
-			addr = malloc_thing(addr_entry_t);
-			addr->ip = virtual_ip->clone(virtual_ip);
-			addr->refcount = 0;
-			addr->virtual = TRUE;
-			addr->scope = RT_SCOPE_UNIVERSE;
-			iface->addrs->insert_last(iface->addrs, addr);
-			
-			if (manage_ipaddr(this, RTM_NEWADDR, NLM_F_CREATE | NLM_F_EXCL,
-							  ifindex, virtual_ip) == SUCCESS)
-			{
-				while (get_vip_refcount(this, virtual_ip) == 0)
-				{	/* wait until address appears */
-					pthread_cond_wait(&this->cond, &this->mutex);
-				}
-				ifaces->destroy(ifaces);
-				return SUCCESS;
-			}
-			ifaces->destroy(ifaces);
-			DBG1(DBG_KNL, "adding virtual IP %H failed", virtual_ip);
-			return FAILED;
-		}
-	}
-	ifaces->destroy(ifaces);
-	
-	DBG1(DBG_KNL, "interface address %H not found, unable to install"
-		 "virtual IP %H", iface_ip, virtual_ip);
-	return FAILED;
+	return this->net->add_ip(this->net, virtual_ip, iface_ip);
 }
 
 /**
- * Implementation of kernel_interface_t.del_ip.
+ * Implementation of kernel_interface_t.del_ip
  */
 static status_t del_ip(private_kernel_interface_t *this, host_t *virtual_ip)
 {
-	iface_entry_t *iface;
-	addr_entry_t *addr;
-	iterator_t *addrs, *ifaces;
-	status_t status;
-	int ifindex;
-
-	DBG2(DBG_KNL, "deleting virtual IP %H", virtual_ip);
-	
-	ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
-	while (ifaces->iterate(ifaces, (void**)&iface))
-	{
-		addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
-		while (addrs->iterate(addrs, (void**)&addr))
-		{
-			if (virtual_ip->ip_equals(virtual_ip, addr->ip))
-			{
-				ifindex = iface->ifindex;
-				if (addr->refcount == 1)
-				{
-					status = manage_ipaddr(this, RTM_DELADDR, 0,
-									  	   ifindex, virtual_ip);
-					if (status == SUCCESS)
-					{	/* wait until the address is really gone */
-						while (get_vip_refcount(this, virtual_ip) > 0)
-						{
-							pthread_cond_wait(&this->cond, &this->mutex);
-						}
-					}
-					addrs->destroy(addrs);
-					ifaces->destroy(ifaces);
-					return status;
-				}
-				else
-				{
-					addr->refcount--;
-				}
-				DBG2(DBG_KNL, "virtual IP %H used by other SAs, not deleting",
-					 virtual_ip);
-				addrs->destroy(addrs);
-				ifaces->destroy(ifaces);
-				return SUCCESS;
-			}
-		}
-		addrs->destroy(addrs);
-	}
-	ifaces->destroy(ifaces);
-	
-	DBG2(DBG_KNL, "virtual IP %H not cached, unable to delete", virtual_ip);
-	return FAILED;
+	return this->net->del_ip(this->net, virtual_ip);
 }
 
 /**
- * Get an SPI for a specific protocol from the kernel.
+ * Implementation of kernel_interface_t.add_route
  */
-static status_t get_spi_internal(private_kernel_interface_t *this,
-		host_t *src, host_t *dst, u_int8_t proto, u_int32_t min, u_int32_t max,
-		u_int32_t reqid, u_int32_t *spi)
+static status_t add_route(private_kernel_interface_t *this, chunk_t dst_net,
+		u_int8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name)
 {
-	unsigned char request[BUFFER_SIZE];
-	struct nlmsghdr *hdr, *out;
-	struct xfrm_userspi_info *userspi;
-	u_int32_t received_spi = 0;
-	size_t len;
-	
-	memset(&request, 0, sizeof(request));
-	
-	hdr = (struct nlmsghdr*)request;
-	hdr->nlmsg_flags = NLM_F_REQUEST;
-	hdr->nlmsg_type = XFRM_MSG_ALLOCSPI;
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userspi_info));
-
-	userspi = (struct xfrm_userspi_info*)NLMSG_DATA(hdr);
-	host2xfrm(src, &userspi->info.saddr);
-	host2xfrm(dst, &userspi->info.id.daddr);
-	userspi->info.id.proto = proto;
-	userspi->info.mode = TRUE; /* tunnel mode */
-	userspi->info.reqid = reqid;
-	userspi->info.family = src->get_family(src);
-	userspi->min = min;
-	userspi->max = max;
-	
-	if (netlink_send(this, this->socket_xfrm, hdr, &out, &len) == SUCCESS)
-	{
-		hdr = out;
-		while (NLMSG_OK(hdr, len))
-		{
-			switch (hdr->nlmsg_type)
-			{
-				case XFRM_MSG_NEWSA:
-				{
-					struct xfrm_usersa_info* usersa = NLMSG_DATA(hdr);
-					received_spi = usersa->id.spi;
-					break;
-				}
-				case NLMSG_ERROR:
-				{
-					struct nlmsgerr *err = NLMSG_DATA(hdr);
-					
-					DBG1(DBG_KNL, "allocating SPI failed: %s (%d)",
-						 strerror(-err->error), -err->error);
-					break;
-				}
-				default:
-					hdr = NLMSG_NEXT(hdr, len);
-					continue;
-				case NLMSG_DONE:
-					break;
-			}
-			break;
-		}
-		free(out);
-	}
-	
-	if (received_spi == 0)
-	{
-		return FAILED;
-	}
-	
-	*spi = received_spi;
-	return SUCCESS;
+	return this->net->add_route(this->net, dst_net, prefixlen, gateway, src_ip,
+			if_name);
 }
 
 /**
- * Implementation of kernel_interface_t.get_spi.
+ * Implementation of kernel_interface_t.del_route
  */
-static status_t get_spi(private_kernel_interface_t *this, 
-						host_t *src, host_t *dst, 
-						protocol_id_t protocol, u_int32_t reqid,
-						u_int32_t *spi)
+static status_t del_route(private_kernel_interface_t *this, chunk_t dst_net,
+		u_int8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name)
 {
-	DBG2(DBG_KNL, "getting SPI for reqid %d", reqid);
-	
-	if (get_spi_internal(this, src, dst,
-			(protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH,
-			0xc0000000, 0xcFFFFFFF, reqid, spi) != SUCCESS)
-	{
-		DBG1(DBG_KNL, "unable to get SPI for reqid %d", reqid);
-		return FAILED;
-	}
-	
-	DBG2(DBG_KNL, "got SPI 0x%x for reqid %d", *spi, reqid);
-	
-	return SUCCESS;
-}
-
-/**
- * Implementation of kernel_interface_t.get_cpi.
- */
-static status_t get_cpi(private_kernel_interface_t *this, 
-						host_t *src, host_t *dst, 
-						u_int32_t reqid, u_int16_t *cpi)
-{
-	u_int32_t received_spi = 0;
-	DBG2(DBG_KNL, "getting CPI for reqid %d", reqid);
-	
-	if (get_spi_internal(this, src, dst,
-			IPPROTO_COMP, 0x100, 0xEFFF, reqid, &received_spi) != SUCCESS)
-	{
-		DBG1(DBG_KNL, "unable to get CPI for reqid %d", reqid);
-		return FAILED;
-	}
-	
-	*cpi = htons((u_int16_t)ntohl(received_spi));
-	
-	DBG2(DBG_KNL, "got CPI 0x%x for reqid %d", *cpi, reqid);
-	
-	return SUCCESS;
-}
-
-/**
- * Implementation of kernel_interface_t.add_sa.
- */
-static status_t add_sa(private_kernel_interface_t *this,
-					   host_t *src, host_t *dst, u_int32_t spi,
-					   protocol_id_t protocol, u_int32_t reqid,
-					   u_int64_t expire_soft, u_int64_t expire_hard,
-					   u_int16_t enc_alg, u_int16_t enc_size,
-					   u_int16_t int_alg, u_int16_t int_size,
-					   prf_plus_t *prf_plus, mode_t mode,
-					   u_int16_t ipcomp, bool encap,
-					   bool replace)
-{
-	unsigned char request[BUFFER_SIZE];
-	char *alg_name;
-	u_int16_t add_keymat = 32; /* additional 4 octets KEYMAT required for AES-GCM as of RFC4106 8.1. */
-	struct nlmsghdr *hdr;
-	struct xfrm_usersa_info *sa;
-	
-	memset(&request, 0, sizeof(request));
-	
-	DBG2(DBG_KNL, "adding SAD entry with SPI 0x%x and reqid %d", spi, reqid);
-
-	hdr = (struct nlmsghdr*)request;
-	hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
-	hdr->nlmsg_type = replace ? XFRM_MSG_UPDSA : XFRM_MSG_NEWSA;
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
-	
-	sa = (struct xfrm_usersa_info*)NLMSG_DATA(hdr);
-	host2xfrm(src, &sa->saddr);
-	host2xfrm(dst, &sa->id.daddr);
-	sa->id.spi = spi;
-	sa->id.proto = (protocol == PROTO_ESP) ? KERNEL_ESP : (protocol == PROTO_AH) ? KERNEL_AH : protocol;
-	sa->family = src->get_family(src);
-	sa->mode = mode;
-	sa->replay_window = (protocol == IPPROTO_COMP) ? 0 : 32;
-	sa->reqid = reqid;
-	/* we currently do not expire SAs by volume/packet count */
-	sa->lft.soft_byte_limit = XFRM_INF;
-	sa->lft.hard_byte_limit = XFRM_INF;
-	sa->lft.soft_packet_limit = XFRM_INF;
-	sa->lft.hard_packet_limit = XFRM_INF;
-	/* we use lifetimes since added, not since used */
-	sa->lft.soft_add_expires_seconds = expire_soft;
-	sa->lft.hard_add_expires_seconds = expire_hard;
-	sa->lft.soft_use_expires_seconds = 0;
-	sa->lft.hard_use_expires_seconds = 0;
-	
-	struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_info);
-	
-	switch (enc_alg)
-	{
-		case ENCR_UNDEFINED:
-			/* no encryption */
-			break;
-		case ENCR_AES_CCM_ICV8:
-		case ENCR_AES_CCM_ICV12:
-		case ENCR_AES_CCM_ICV16:
-			/* AES-CCM needs only 3 additional octets KEYMAT as of RFC 4309 7.1. */
-			add_keymat = 24;
-			/* fall-through */
-		case ENCR_AES_GCM_ICV8:
-		case ENCR_AES_GCM_ICV12:
-		case ENCR_AES_GCM_ICV16:
-		{
-			u_int16_t icv_size = 0;
-			rthdr->rta_type = XFRMA_ALG_AEAD;
-			alg_name = lookup_algorithm(encryption_algs, enc_alg, &icv_size);
-			if (alg_name == NULL)
-			{
-				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_size);
-			
-			/* additional KEYMAT required */
-			enc_size += add_keymat;
-			
-			rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_aead) + enc_size / 8);
-			hdr->nlmsg_len += rthdr->rta_len;
-			if (hdr->nlmsg_len > sizeof(request))
-			{
-				return FAILED;
-			}
-			
-			struct xfrm_algo_aead* algo = (struct xfrm_algo_aead*)RTA_DATA(rthdr);
-			algo->alg_key_len = enc_size;
-			algo->alg_icv_len = icv_size;
-			strcpy(algo->alg_name, alg_name);
-			prf_plus->get_bytes(prf_plus, enc_size / 8, algo->alg_key);
-			
-			rthdr = XFRM_RTA_NEXT(rthdr);
-			break;
-		}
-		default:
-		{
-			rthdr->rta_type = XFRMA_ALG_CRYPT;
-			alg_name = lookup_algorithm(encryption_algs, enc_alg, &enc_size);
-			if (alg_name == NULL)
-			{
-				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_size);
-			
-			rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + enc_size / 8);
-			hdr->nlmsg_len += rthdr->rta_len;
-			if (hdr->nlmsg_len > sizeof(request))
-			{
-				return FAILED;
-			}
-			
-			struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr);
-			algo->alg_key_len = enc_size;
-			strcpy(algo->alg_name, alg_name);
-			prf_plus->get_bytes(prf_plus, enc_size / 8, algo->alg_key);
-			
-			rthdr = XFRM_RTA_NEXT(rthdr);
-			break;
-		}
-	}
-		
-	if (int_alg  != AUTH_UNDEFINED)
-	{
-		rthdr->rta_type = XFRMA_ALG_AUTH;
-		alg_name = lookup_algorithm(integrity_algs, int_alg, &int_size);
-		if (alg_name == NULL)
-		{
-			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_size);
-		
-		rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + int_size / 8);
-		hdr->nlmsg_len += rthdr->rta_len;
-		if (hdr->nlmsg_len > sizeof(request))
-		{
-			return FAILED;
-		}
-		
-		struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr);
-		algo->alg_key_len = int_size;
-		strcpy(algo->alg_name, alg_name);
-		prf_plus->get_bytes(prf_plus, int_size / 8, algo->alg_key);
-		
-		rthdr = XFRM_RTA_NEXT(rthdr);
-	}
-	
-	if (ipcomp != IPCOMP_NONE)
-	{
-		rthdr->rta_type = XFRMA_ALG_COMP;
-		alg_name = lookup_algorithm(compression_algs, ipcomp, NULL);
-		if (alg_name == NULL)
-		{
-			DBG1(DBG_KNL, "algorithm %N not supported by kernel!", 
-				 ipcomp_transform_names, ipcomp);
-			return FAILED;
-		}
-		DBG2(DBG_KNL, "  using compression algorithm %N",
-			 ipcomp_transform_names, ipcomp);
-		
-		rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo));
-		hdr->nlmsg_len += rthdr->rta_len;
-		if (hdr->nlmsg_len > sizeof(request))
-		{
-			return FAILED;
-		}
-		
-		struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr);
-		algo->alg_key_len = 0;
-		strcpy(algo->alg_name, alg_name);
-		
-		rthdr = XFRM_RTA_NEXT(rthdr);
-	}
-	
-	if (encap)
-	{
-		rthdr->rta_type = XFRMA_ENCAP;
-		rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl));
-
-		hdr->nlmsg_len += rthdr->rta_len;
-		if (hdr->nlmsg_len > sizeof(request))
-		{
-			return FAILED;
-		}
-
-		struct xfrm_encap_tmpl* tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rthdr);
-		tmpl->encap_type = UDP_ENCAP_ESPINUDP;
-		tmpl->encap_sport = htons(src->get_port(src));
-		tmpl->encap_dport = htons(dst->get_port(dst));
-		memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t));
-		/* encap_oa could probably be derived from the 
-		 * traffic selectors [rfc4306, p39]. In the netlink kernel implementation 
-		 * pluto does the same as we do here but it uses encap_oa in the 
-		 * pfkey implementation. BUT as /usr/src/linux/net/key/af_key.c indicates 
-		 * the kernel ignores it anyway
-		 *   -> does that mean that NAT-T encap doesn't work in transport mode?
-		 * No. The reason the kernel ignores NAT-OA is that it recomputes 
-		 * (or, rather, just ignores) the checksum. If packets pass
-		 * the IPsec checks it marks them "checksum ok" so OA isn't needed. */
-		rthdr = XFRM_RTA_NEXT(rthdr);
-	}
-	
-	if (netlink_send_ack(this, this->socket_xfrm, hdr) != SUCCESS)
-	{
-		DBG1(DBG_KNL, "unable to add SAD entry with SPI 0x%x", spi);
-		return FAILED;
-	}
-	return SUCCESS;
+	return this->net->del_route(this->net, dst_net, prefixlen, gateway, src_ip,
+			if_name);
 }
 
-/**
- * Get the replay state (i.e. sequence numbers) of an SA.
- */
-static status_t get_replay_state(private_kernel_interface_t *this,
-						  u_int32_t spi, protocol_id_t protocol, host_t *dst,
-						  struct xfrm_replay_state *replay)
-{
-	unsigned char request[BUFFER_SIZE];
-	struct nlmsghdr *hdr, *out = NULL;
-	struct xfrm_aevent_id *out_aevent = NULL, *aevent_id;
-	size_t len;
-	struct rtattr *rta;
-	size_t rtasize;
-	
-	memset(&request, 0, sizeof(request));
-	
-	DBG2(DBG_KNL, "querying replay state from SAD entry with SPI 0x%x", spi);
-
-	hdr = (struct nlmsghdr*)request;
-	hdr->nlmsg_flags = NLM_F_REQUEST;
-	hdr->nlmsg_type = XFRM_MSG_GETAE;
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
-
-	aevent_id = (struct xfrm_aevent_id*)NLMSG_DATA(hdr);
-	aevent_id->flags = XFRM_AE_RVAL;
-	
-	host2xfrm(dst, &aevent_id->sa_id.daddr);
-	aevent_id->sa_id.spi = spi;
-	aevent_id->sa_id.proto = (protocol == PROTO_ESP) ? KERNEL_ESP : (protocol == PROTO_AH) ? KERNEL_AH : protocol;
-	aevent_id->sa_id.family = dst->get_family(dst);
-	
-	if (netlink_send(this, this->socket_xfrm, hdr, &out, &len) == SUCCESS)
-	{
-		hdr = out;
-		while (NLMSG_OK(hdr, len))
-		{
-			switch (hdr->nlmsg_type)
-			{
-				case XFRM_MSG_NEWAE:
-				{
-					out_aevent = NLMSG_DATA(hdr);
-					break;
-				}
-				case NLMSG_ERROR:
-				{
-					struct nlmsgerr *err = NLMSG_DATA(hdr);
-					DBG1(DBG_KNL, "querying replay state from SAD entry failed: %s (%d)",
-						 strerror(-err->error), -err->error);
-					break;
-				}
-				default:
-					hdr = NLMSG_NEXT(hdr, len);
-					continue;
-				case NLMSG_DONE:
-					break;
-			}
-			break;
-		}
-	}
-	
-	if (out_aevent == NULL)
-	{
-		DBG1(DBG_KNL, "unable to query replay state from SAD entry with SPI 0x%x", spi);
-		free(out);
-		return FAILED;
-	}
-	
-	rta = XFRM_RTA(out, struct xfrm_aevent_id);
-	rtasize = XFRM_PAYLOAD(out, struct xfrm_aevent_id);
-	while(RTA_OK(rta, rtasize))
-	{
-		if (rta->rta_type == XFRMA_REPLAY_VAL)
-		{
-			memcpy(replay, RTA_DATA(rta), rta->rta_len);
-			free(out);
-			return SUCCESS;
-		}
-		rta = RTA_NEXT(rta, rtasize);
-	}
-	
-	DBG1(DBG_KNL, "unable to query replay state from SAD entry with SPI 0x%x", spi);
-	free(out);
-	return FAILED;
-}
 
 /**
- * Implementation of kernel_interface_t.update_sa.
+ * Implementation of kernel_interface_t.add_ipsec_interface.
  */
-static status_t update_sa(private_kernel_interface_t *this,
-						  u_int32_t spi, protocol_id_t protocol,
-						  host_t *src, host_t *dst,
-						  host_t *new_src, host_t *new_dst, bool encap)
+static void add_ipsec_interface(private_kernel_interface_t *this,
+		kernel_ipsec_constructor_t *create)
 {
-	unsigned char request[BUFFER_SIZE], *pos;
-	struct nlmsghdr *hdr, *out = NULL;
-	struct xfrm_usersa_id *sa_id;
-	struct xfrm_usersa_info *out_sa = NULL, *sa;
-	size_t len;
-	struct rtattr *rta;
-	size_t rtasize;
-	struct xfrm_encap_tmpl* tmpl = NULL;
-	bool got_replay_state;
-	struct xfrm_replay_state replay;
-	
-	memset(&request, 0, sizeof(request));
-	
-	DBG2(DBG_KNL, "querying SAD entry with SPI 0x%x for update", spi);
-
-	/* query the exisiting SA first */
-	hdr = (struct nlmsghdr*)request;
-	hdr->nlmsg_flags = NLM_F_REQUEST;
-	hdr->nlmsg_type = XFRM_MSG_GETSA;
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
-
-	sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
-	host2xfrm(dst, &sa_id->daddr);
-	sa_id->spi = spi;
-	sa_id->proto = (protocol == PROTO_ESP) ? KERNEL_ESP : (protocol == PROTO_AH) ? KERNEL_AH : protocol;
-	sa_id->family = dst->get_family(dst);
-	
-	if (netlink_send(this, this->socket_xfrm, hdr, &out, &len) == SUCCESS)
-	{
-		hdr = out;
-		while (NLMSG_OK(hdr, len))
-		{
-			switch (hdr->nlmsg_type)
-			{
-				case XFRM_MSG_NEWSA:
-				{
-					out_sa = NLMSG_DATA(hdr);
-					break;
-				}
-				case NLMSG_ERROR:
-				{
-					struct nlmsgerr *err = NLMSG_DATA(hdr);
-					DBG1(DBG_KNL, "querying SAD entry failed: %s (%d)",
-						 strerror(-err->error), -err->error);
-					break;
-				}
-				default:
-					hdr = NLMSG_NEXT(hdr, len);
-					continue;
-				case NLMSG_DONE:
-					break;
-			}
-			break;
-		}
-	}
-	if (out_sa == NULL)
-	{
-		DBG1(DBG_KNL, "unable to update SAD entry with SPI 0x%x", spi);
-		free(out);
-		return FAILED;
-	}
-	
-	/* try to get the replay state */
-	got_replay_state = (get_replay_state(
-						this, spi, protocol, dst, &replay) == SUCCESS);
-	
-	/* delete the old SA */
-	if (this->public.del_sa(&this->public, dst, spi, protocol) != SUCCESS)
-	{
-		DBG1(DBG_KNL, "unable to delete old SAD entry with SPI 0x%x", spi);
-		free(out);
-		return FAILED;
-	}
-	
-	DBG2(DBG_KNL, "updating SAD entry with SPI 0x%x from %#H..%#H to %#H..%#H",
-		 spi, src, dst, new_src, new_dst);
-	
-	/* copy over the SA from out to request */
-	hdr = (struct nlmsghdr*)request;
-	memcpy(hdr, out, min(out->nlmsg_len, sizeof(request)));
-	hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;	
-	hdr->nlmsg_type = XFRM_MSG_NEWSA;
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
-	sa = NLMSG_DATA(hdr);
-	sa->family = new_dst->get_family(new_dst);
-	
-	if (!src->ip_equals(src, new_src))
-	{
-		host2xfrm(new_src, &sa->saddr);
-	}
-	if (!dst->ip_equals(dst, new_dst))
-	{
-		host2xfrm(new_dst, &sa->id.daddr);
-	}
-	
-	rta = XFRM_RTA(out, struct xfrm_usersa_info);
-	rtasize = XFRM_PAYLOAD(out, struct xfrm_usersa_info);
-	pos = (u_char*)XFRM_RTA(hdr, struct xfrm_usersa_info);
-	while(RTA_OK(rta, rtasize))
-	{
-		/* copy all attributes, but not XFRMA_ENCAP if we are disabling it */
-		if (rta->rta_type != XFRMA_ENCAP || encap)
-		{
-			if (rta->rta_type == XFRMA_ENCAP)
-			{	/* update encap tmpl */
-				tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta);
-				tmpl->encap_sport = ntohs(new_src->get_port(new_src));
-				tmpl->encap_dport = ntohs(new_dst->get_port(new_dst));
-			}	
-			memcpy(pos, rta, rta->rta_len);
-			pos += RTA_ALIGN(rta->rta_len);
-			hdr->nlmsg_len += RTA_ALIGN(rta->rta_len);
-		}
-		rta = RTA_NEXT(rta, rtasize);
-	}
-	
-	rta = (struct rtattr*)pos;
-	if (tmpl == NULL && encap)
-	{	/* add tmpl if we are enabling it */
-		rta->rta_type = XFRMA_ENCAP;
-		rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl));
-		
-		hdr->nlmsg_len += rta->rta_len;
-		if (hdr->nlmsg_len > sizeof(request))
-		{
-			return FAILED;
-		}
-		
-		tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta);
-		tmpl->encap_type = UDP_ENCAP_ESPINUDP;
-		tmpl->encap_sport = ntohs(new_src->get_port(new_src));
-		tmpl->encap_dport = ntohs(new_dst->get_port(new_dst));
-		memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t));
-		
-		rta = XFRM_RTA_NEXT(rta);
-	}
-	
-	if (got_replay_state)
-	{	/* copy the replay data if available */
-		rta->rta_type = XFRMA_REPLAY_VAL;
-		rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_replay_state));
-		
-		hdr->nlmsg_len += rta->rta_len;
-		if (hdr->nlmsg_len > sizeof(request))
-		{
-			return FAILED;
-		}
-		memcpy(RTA_DATA(rta), &replay, sizeof(replay));
-		
-		rta = XFRM_RTA_NEXT(rta);
-	}
-	
-	if (netlink_send_ack(this, this->socket_xfrm, hdr) != SUCCESS)
-	{
-		DBG1(DBG_KNL, "unable to update SAD entry with SPI 0x%x", spi);
-		free(out);
-		return FAILED;
-	}
-	free(out);
-	
-	return SUCCESS;
+	this->mutex->lock(this->mutex);
+	this->ipsec_interfaces->insert_last(this->ipsec_interfaces, create);
+	this->mutex->unlock(this->mutex);
 }
 
 /**
- * Implementation of kernel_interface_t.query_sa.
+ * Implementation of kernel_interface_t.remove_ipsec_interface.
  */
-static status_t query_sa(private_kernel_interface_t *this, host_t *dst,
-						 u_int32_t spi, protocol_id_t protocol,
-						 u_int32_t *use_time)
+static void remove_ipsec_interface(private_kernel_interface_t *this,
+		kernel_ipsec_constructor_t *create)
 {
-	unsigned char request[BUFFER_SIZE];
-	struct nlmsghdr *out = NULL, *hdr;
-	struct xfrm_usersa_id *sa_id;
-	struct xfrm_usersa_info *sa = NULL;
-	size_t len;
-	
-	DBG2(DBG_KNL, "querying SAD entry with SPI 0x%x", spi);
-	memset(&request, 0, sizeof(request));
-	
-	hdr = (struct nlmsghdr*)request;
-	hdr->nlmsg_flags = NLM_F_REQUEST;
-	hdr->nlmsg_type = XFRM_MSG_GETSA;
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
-
-	sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
-	host2xfrm(dst, &sa_id->daddr);
-	sa_id->spi = spi;
-	sa_id->proto = (protocol == PROTO_ESP) ? KERNEL_ESP : (protocol == PROTO_AH) ? KERNEL_AH : protocol;
-	sa_id->family = dst->get_family(dst);
-	
-	if (netlink_send(this, this->socket_xfrm, hdr, &out, &len) == SUCCESS)
-	{
-		hdr = out;
-		while (NLMSG_OK(hdr, len))
-		{
-			switch (hdr->nlmsg_type)
-			{
-				case XFRM_MSG_NEWSA:
-				{
-					sa = NLMSG_DATA(hdr);
-					break;
-				}
-				case NLMSG_ERROR:
-				{
-					struct nlmsgerr *err = NLMSG_DATA(hdr);
-					DBG1(DBG_KNL, "querying SAD entry failed: %s (%d)",
-						 strerror(-err->error), -err->error);
-					break;
-				}
-				default:
-					hdr = NLMSG_NEXT(hdr, len);
-					continue;
-				case NLMSG_DONE:
-					break;
-			}
-			break;
-		}
-	}
-	
-	if (sa == NULL)
-	{
-		DBG1(DBG_KNL, "unable to query SAD entry with SPI 0x%x", spi);
-		free(out);
-		return FAILED;
-	}
-	
-	*use_time = sa->curlft.use_time;
-	free (out);
-	return SUCCESS;
+	this->mutex->lock(this->mutex);
+	this->ipsec_interfaces->remove(this->ipsec_interfaces, create, NULL);
+	this->mutex->unlock(this->mutex);
 }
 
 /**
- * Implementation of kernel_interface_t.del_sa.
+ * Implementation of kernel_interface_t.add_ipsec_interface.
  */
-static status_t del_sa(private_kernel_interface_t *this, host_t *dst,
-					   u_int32_t spi, protocol_id_t protocol)
+static void add_net_interface(private_kernel_interface_t *this,
+		kernel_net_constructor_t *create)
 {
-	unsigned char request[BUFFER_SIZE];
-	struct nlmsghdr *hdr;
-	struct xfrm_usersa_id *sa_id;
-	
-	memset(&request, 0, sizeof(request));
-	
-	DBG2(DBG_KNL, "deleting SAD entry with SPI 0x%x", spi);
-	
-	hdr = (struct nlmsghdr*)request;
-	hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
-	hdr->nlmsg_type = XFRM_MSG_DELSA;
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
-	
-	sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
-	host2xfrm(dst, &sa_id->daddr);
-	sa_id->spi = spi;
-	sa_id->proto = (protocol == PROTO_ESP) ? KERNEL_ESP : (protocol == PROTO_AH) ? KERNEL_AH : protocol;
-	sa_id->family = dst->get_family(dst);
-	
-	if (netlink_send_ack(this, this->socket_xfrm, hdr) != SUCCESS)
-	{
-		DBG1(DBG_KNL, "unable to delete SAD entry with SPI 0x%x", spi);
-		return FAILED;
-	}
-	DBG2(DBG_KNL, "deleted SAD entry with SPI 0x%x", spi);
-	return SUCCESS;
+	this->mutex->lock(this->mutex);
+	this->net_interfaces->insert_last(this->net_interfaces, create);
+	this->mutex->unlock(this->mutex);
 }
 
 /**
- * Implementation of kernel_interface_t.add_policy.
+ * Implementation of kernel_interface_t.remove_ipsec_interface.
  */
-static status_t add_policy(private_kernel_interface_t *this, 
-						   host_t *src, host_t *dst,
-						   traffic_selector_t *src_ts,
-						   traffic_selector_t *dst_ts,
-						   policy_dir_t direction, protocol_id_t protocol,
-						   u_int32_t reqid, bool high_prio, mode_t mode,
-						   u_int16_t ipcomp)
+static void remove_net_interface(private_kernel_interface_t *this,
+		kernel_net_constructor_t *create)
 {
-	iterator_t *iterator;
-	policy_entry_t *current, *policy;
-	bool found = FALSE;
-	unsigned char request[BUFFER_SIZE];
-	struct xfrm_userpolicy_info *policy_info;
-	struct nlmsghdr *hdr;
-	
-	/* create a policy */
-	policy = malloc_thing(policy_entry_t);
-	memset(policy, 0, sizeof(policy_entry_t));
-	policy->sel = ts2selector(src_ts, dst_ts);
-	policy->direction = direction;
-	
-	/* find the policy, which matches EXACTLY */
-	pthread_mutex_lock(&this->mutex);
-	iterator = this->policies->create_iterator(this->policies, TRUE);
-	while (iterator->iterate(iterator, (void**)&current))
-	{
-		if (memcmp(&current->sel, &policy->sel, sizeof(struct xfrm_selector)) == 0 &&
-			policy->direction == current->direction)
-		{
-			/* use existing policy */
-			current->refcount++;
-			DBG2(DBG_KNL, "policy %R===%R already exists, increasing "
-				 "refcount", src_ts, dst_ts);
-			free(policy);
-			policy = current;
-			found = TRUE;
-			break;
-		}
-	}
-	iterator->destroy(iterator);
-	if (!found)
-	{	/* apply the new one, if we have no such policy */
-		this->policies->insert_last(this->policies, policy);
-		policy->refcount = 1;
-	}
-	
-	DBG2(DBG_KNL, "adding policy %R===%R", src_ts, dst_ts);
-	
-	memset(&request, 0, sizeof(request));
-	hdr = (struct nlmsghdr*)request;
-	hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
-	hdr->nlmsg_type = XFRM_MSG_UPDPOLICY;
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info));
-
-	policy_info = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr);
-	policy_info->sel = policy->sel;
-	policy_info->dir = policy->direction;
-	/* calculate priority based on source selector size, small size = high prio */
-	policy_info->priority = high_prio ? PRIO_HIGH : PRIO_LOW;
-	policy_info->priority -= policy->sel.prefixlen_s * 10;
-	policy_info->priority -= policy->sel.proto ? 2 : 0;
-	policy_info->priority -= policy->sel.sport_mask ? 1 : 0;
-	policy_info->action = XFRM_POLICY_ALLOW;
-	policy_info->share = XFRM_SHARE_ANY;
-	pthread_mutex_unlock(&this->mutex);
-	
-	/* policies don't expire */
-	policy_info->lft.soft_byte_limit = XFRM_INF;
-	policy_info->lft.soft_packet_limit = XFRM_INF;
-	policy_info->lft.hard_byte_limit = XFRM_INF;
-	policy_info->lft.hard_packet_limit = XFRM_INF;
-	policy_info->lft.soft_add_expires_seconds = 0;
-	policy_info->lft.hard_add_expires_seconds = 0;
-	policy_info->lft.soft_use_expires_seconds = 0;
-	policy_info->lft.hard_use_expires_seconds = 0;
-	
-	struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_userpolicy_info);
-	rthdr->rta_type = XFRMA_TMPL;
-	rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
-	
-	hdr->nlmsg_len += rthdr->rta_len;
-	if (hdr->nlmsg_len > sizeof(request))
-	{
-		return FAILED;
-	}
-	
-	struct xfrm_user_tmpl *tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rthdr);
-	
-	if (ipcomp != IPCOMP_NONE)
-	{
-		tmpl->reqid = reqid;
-		tmpl->id.proto = IPPROTO_COMP;
-		tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0;
-		tmpl->mode = mode;
-		tmpl->optional = direction != POLICY_OUT;
-		tmpl->family = src->get_family(src);
-		
-		host2xfrm(src, &tmpl->saddr);
-		host2xfrm(dst, &tmpl->id.daddr);
-		
-		/* add an additional xfrm_user_tmpl */
-		rthdr->rta_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
-		hdr->nlmsg_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
-		if (hdr->nlmsg_len > sizeof(request))
-		{
-			return FAILED;
-		}
-		
-		tmpl++;
-	}
-	
-	tmpl->reqid = reqid;
-	tmpl->id.proto = (protocol == PROTO_AH) ? KERNEL_AH : KERNEL_ESP;
-	tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0;
-	tmpl->mode = mode;
-	tmpl->family = src->get_family(src);
-	
-	host2xfrm(src, &tmpl->saddr);
-	host2xfrm(dst, &tmpl->id.daddr);
-	
-	if (netlink_send_ack(this, this->socket_xfrm, hdr) != SUCCESS)
-	{
-		DBG1(DBG_KNL, "unable to add policy %R===%R", src_ts, dst_ts);
-		return FAILED;
-	}
-	
-	/* 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 &&
-		mode != MODE_TRANSPORT && src->get_family(src) != AF_INET6 &&
-		this->install_routes)
-	{
-		policy->route = malloc_thing(route_entry_t);
-		if (get_address_by_ts(this, dst_ts, &policy->route->src_ip) == SUCCESS)
-		{
-			/* get the nexthop to src (src as we are in POLICY_FWD).*/
-			policy->route->gateway = get_route(this, src, TRUE);
-			policy->route->if_index = get_interface_index(this, dst);
-			policy->route->dst_net = chunk_alloc(policy->sel.family == AF_INET ? 4 : 16);
-			memcpy(policy->route->dst_net.ptr, &policy->sel.saddr, policy->route->dst_net.len);
-			policy->route->prefixlen = policy->sel.prefixlen_s;
-			
-			if (manage_srcroute(this, RTM_NEWROUTE, NLM_F_CREATE | NLM_F_EXCL,
-								policy->route) != SUCCESS)
-			{
-				DBG1(DBG_KNL, "unable to install source route for %H",
-					 policy->route->src_ip);
-				route_entry_destroy(policy->route);
-				policy->route = NULL;
-			}
-		}
-		else
-		{
-			free(policy->route);
-			policy->route = NULL;
-		}
-	}
-
-	return SUCCESS;
+	this->mutex->lock(this->mutex);
+	this->net_interfaces->remove(this->net_interfaces, create, NULL);
+	this->mutex->unlock(this->mutex);
 }
 
 /**
- * Implementation of kernel_interface_t.query_policy.
+ * Implementation of kernel_interface_t.create_interfaces.
  */
-static status_t query_policy(private_kernel_interface_t *this,
-							 traffic_selector_t *src_ts, 
-							 traffic_selector_t *dst_ts,
-							 policy_dir_t direction, u_int32_t *use_time)
+static void create_interfaces(private_kernel_interface_t *this)
 {
-	unsigned char request[BUFFER_SIZE];
-	struct nlmsghdr *out = NULL, *hdr;
-	struct xfrm_userpolicy_id *policy_id;
-	struct xfrm_userpolicy_info *policy = NULL;
-	size_t len;
+	kernel_ipsec_constructor_t create_ipsec;
+	kernel_net_constructor_t create_net;
 	
-	memset(&request, 0, sizeof(request));
-	
-	DBG2(DBG_KNL, "querying policy %R===%R", src_ts, dst_ts);
-
-	hdr = (struct nlmsghdr*)request;
-	hdr->nlmsg_flags = NLM_F_REQUEST;
-	hdr->nlmsg_type = XFRM_MSG_GETPOLICY;
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id));
-
-	policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr);
-	policy_id->sel = ts2selector(src_ts, dst_ts);
-	policy_id->dir = direction;
-	
-	if (netlink_send(this, this->socket_xfrm, hdr, &out, &len) == SUCCESS)
+	this->mutex->lock(this->mutex);
+	if (this->ipsec_interfaces->get_first(this->ipsec_interfaces, (void**)&create_ipsec) != SUCCESS)
 	{
-		hdr = out;
-		while (NLMSG_OK(hdr, len))
-		{
-			switch (hdr->nlmsg_type)
-			{
-				case XFRM_MSG_NEWPOLICY:
-				{
-					policy = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr);
-					break;
-				}
-				case NLMSG_ERROR:
-				{
-					struct nlmsgerr *err = NLMSG_DATA(hdr);
-					DBG1(DBG_KNL, "querying policy failed: %s (%d)",
-						 strerror(-err->error), -err->error);
-					break;
-				}
-				default:
-					hdr = NLMSG_NEXT(hdr, len);
-					continue;
-				case NLMSG_DONE:
-					break;
-			}
-			break;
-		}
+		this->mutex->unlock(this->mutex);
+		charon->kill(charon, "no ipsec kernel interface loaded");
 	}
 	
-	if (policy == NULL)
+	if (this->net_interfaces->get_first(this->net_interfaces, (void**)&create_net) != SUCCESS)
 	{
-		DBG2(DBG_KNL, "unable to query policy %R===%R", src_ts, dst_ts);
-		free(out);
-		return FAILED;
+		this->mutex->unlock(this->mutex);
+		charon->kill(charon, "no network kernel interface loaded");
 	}
-	*use_time = (time_t)policy->curlft.use_time;
+	this->mutex->unlock(this->mutex);
 	
-	free(out);
-	return SUCCESS;
-}
-
-/**
- * Implementation of kernel_interface_t.del_policy.
- */
-static status_t del_policy(private_kernel_interface_t *this,
-						   traffic_selector_t *src_ts, 
-						   traffic_selector_t *dst_ts,
-						   policy_dir_t direction)
-{
-	policy_entry_t *current, policy, *to_delete = NULL;
-	route_entry_t *route;
-	unsigned char request[BUFFER_SIZE];
-	struct nlmsghdr *hdr;
-	struct xfrm_userpolicy_id *policy_id;
-	iterator_t *iterator;
-	
-	DBG2(DBG_KNL, "deleting policy %R===%R", src_ts, dst_ts);
-	
-	/* create a policy */
-	memset(&policy, 0, sizeof(policy_entry_t));
-	policy.sel = ts2selector(src_ts, dst_ts);
-	policy.direction = direction;
-	
-	/* find the policy */
-	iterator = this->policies->create_iterator_locked(this->policies, &this->mutex);
-	while (iterator->iterate(iterator, (void**)&current))
-	{
-		if (memcmp(&current->sel, &policy.sel, sizeof(struct xfrm_selector)) == 0 &&
-			policy.direction == current->direction)
-		{
-			to_delete = current;
-			if (--to_delete->refcount > 0)
-			{
-				/* is used by more SAs, keep in kernel */
-				DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed");
-				iterator->destroy(iterator);
-				return SUCCESS;
-			}
-			/* remove if last reference */
-			iterator->remove(iterator);
-			break;
-		}
-	}
-	iterator->destroy(iterator);
-	if (!to_delete)
-	{
-		DBG1(DBG_KNL, "deleting policy %R===%R failed, not found", src_ts, dst_ts);
-		return NOT_FOUND;
-	}
-	
-	memset(&request, 0, sizeof(request));
-	
-	hdr = (struct nlmsghdr*)request;
-	hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
-	hdr->nlmsg_type = XFRM_MSG_DELPOLICY;
-	hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id));
-
-	policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr);
-	policy_id->sel = to_delete->sel;
-	policy_id->dir = direction;
-	
-	route = to_delete->route;
-	free(to_delete);
-	
-	if (netlink_send_ack(this, this->socket_xfrm, hdr) != SUCCESS)
-	{
-		DBG1(DBG_KNL, "unable to delete policy %R===%R", src_ts, dst_ts);
-		return FAILED;
-	}
-
-	if (route)
-	{
-		if (manage_srcroute(this, RTM_DELROUTE, 0, route) != SUCCESS)
-		{
-			DBG1(DBG_KNL, "error uninstalling route installed with "
-				 "policy %R===%R", src_ts, dst_ts);
-		}		
-		route_entry_destroy(route);
-	}
-	return SUCCESS;
+	this->ipsec = create_ipsec();
+	this->net = create_net();
 }
 
 /**
@@ -2875,132 +305,53 @@ static status_t del_policy(private_kernel_interface_t *this,
  */
 static void destroy(private_kernel_interface_t *this)
 {
-	if (this->routing_table)
-	{
-		manage_rule(this, RTM_DELRULE, this->routing_table,
-					this->routing_table_prio);
-	}
-
-	this->job->cancel(this->job);
-	close(this->socket_xfrm_events);
-	close(this->socket_xfrm);
-	close(this->socket_rt_events);
-	close(this->socket_rt);
-	this->policies->destroy(this->policies);
-	this->ifaces->destroy_function(this->ifaces, (void*)iface_entry_destroy);
+	DESTROY_IF(this->ipsec);
+	DESTROY_IF(this->net);
+	this->ipsec_interfaces->destroy(this->ipsec_interfaces);
+	this->net_interfaces->destroy(this->net_interfaces);
+	this->mutex->destroy(this->mutex);
 	free(this);
 }
 
 /*
- * Described in header.
+ * Described in header-file
  */
 kernel_interface_t *kernel_interface_create()
 {
 	private_kernel_interface_t *this = malloc_thing(private_kernel_interface_t);
-	struct sockaddr_nl addr;
 	
-	/* public functions */
 	this->public.get_spi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,protocol_id_t,u_int32_t,u_int32_t*))get_spi;
 	this->public.get_cpi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,u_int32_t,u_int16_t*))get_cpi;
-	this->public.add_sa  = (status_t(*)(kernel_interface_t *,host_t*,host_t*,u_int32_t,protocol_id_t,u_int32_t,u_int64_t,u_int64_t,u_int16_t,u_int16_t,u_int16_t,u_int16_t,prf_plus_t*,mode_t,u_int16_t,bool,bool))add_sa;
+	this->public.add_sa  = (status_t(*)(kernel_interface_t *,host_t*,host_t*,u_int32_t,protocol_id_t,u_int32_t,u_int64_t,u_int64_t,u_int16_t,u_int16_t,u_int16_t,u_int16_t,prf_plus_t*,ipsec_mode_t,u_int16_t,bool,bool))add_sa;
 	this->public.update_sa = (status_t(*)(kernel_interface_t*,u_int32_t,protocol_id_t,host_t*,host_t*,host_t*,host_t*,bool))update_sa;
 	this->public.query_sa = (status_t(*)(kernel_interface_t*,host_t*,u_int32_t,protocol_id_t,u_int32_t*))query_sa;
 	this->public.del_sa = (status_t(*)(kernel_interface_t*,host_t*,u_int32_t,protocol_id_t))del_sa;
-	this->public.add_policy = (status_t(*)(kernel_interface_t*,host_t*,host_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,protocol_id_t,u_int32_t,bool,mode_t,u_int16_t))add_policy;
+	this->public.add_policy = (status_t(*)(kernel_interface_t*,host_t*,host_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,protocol_id_t,u_int32_t,bool,ipsec_mode_t,u_int16_t))add_policy;
 	this->public.query_policy = (status_t(*)(kernel_interface_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,u_int32_t*))query_policy;
 	this->public.del_policy = (status_t(*)(kernel_interface_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t))del_policy;
-	this->public.get_interface = (char*(*)(kernel_interface_t*,host_t*))get_interface_name;
-	this->public.create_address_iterator = (iterator_t*(*)(kernel_interface_t*))create_address_iterator;
-	this->public.get_source_addr = (host_t*(*)(kernel_interface_t*, host_t *dest))get_source_addr;
+	
+	this->public.get_source_addr = (host_t*(*)(kernel_interface_t*, host_t *dest, host_t *src))get_source_addr;
+	this->public.get_nexthop = (host_t*(*)(kernel_interface_t*, host_t *dest))get_nexthop;
+	this->public.get_interface = (char*(*)(kernel_interface_t*,host_t*))get_interface;
+	this->public.create_address_enumerator = (enumerator_t*(*)(kernel_interface_t*,bool,bool))create_address_enumerator;
 	this->public.add_ip = (status_t(*)(kernel_interface_t*,host_t*,host_t*)) add_ip;
 	this->public.del_ip = (status_t(*)(kernel_interface_t*,host_t*)) del_ip;
-	this->public.destroy = (void(*)(kernel_interface_t*)) destroy;
-
-	/* private members */
-	this->policies = linked_list_create();
-	this->ifaces = linked_list_create();
-	this->hiter = NULL;
-	this->seq = 200;
-	pthread_mutex_init(&this->mutex, NULL);
-	pthread_mutex_init(&this->nl_mutex, NULL);
-	pthread_cond_init(&this->cond, NULL);
-	timerclear(&this->last_roam);
-	this->install_routes = lib->settings->get_bool(lib->settings,
-					"charon.install_routes", TRUE);
-	this->routing_table = lib->settings->get_int(lib->settings,
-					"charon.routing_table", IPSEC_ROUTING_TABLE);
-	this->routing_table_prio = lib->settings->get_int(lib->settings,
-					"charon.routing_table_prio", IPSEC_ROUTING_TABLE_PRIO);
-	memset(&addr, 0, sizeof(addr));
-	addr.nl_family = AF_NETLINK;
-	
-	/* create and bind RT socket */
-	this->socket_rt = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
-	if (this->socket_rt <= 0)
-	{
-		charon->kill(charon, "unable to create RT netlink socket");
-	}
-	addr.nl_groups = 0;
-	if (bind(this->socket_rt, (struct sockaddr*)&addr, sizeof(addr)))
-	{
-		charon->kill(charon, "unable to bind RT netlink socket");
-	}
-	
-	/* create and bind RT socket for events (address/interface/route changes) */
-	this->socket_rt_events = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
-	if (this->socket_rt_events <= 0)
-	{
-		charon->kill(charon, "unable to create RT event socket");
-	}
-	addr.nl_groups = RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR | 
-					 RTMGRP_IPV4_ROUTE | RTMGRP_IPV4_ROUTE | RTMGRP_LINK;
-	if (bind(this->socket_rt_events, (struct sockaddr*)&addr, sizeof(addr)))
-	{
-		charon->kill(charon, "unable to bind RT event socket");
-	}
+	this->public.add_route = (status_t(*)(kernel_interface_t*,chunk_t,u_int8_t,host_t*,host_t*,char*)) add_route;
+	this->public.del_route = (status_t(*)(kernel_interface_t*,chunk_t,u_int8_t,host_t*,host_t*,char*)) del_route;
 	
-	/* create and bind XFRM socket */ 
-	this->socket_xfrm = socket(AF_NETLINK, SOCK_RAW, NETLINK_XFRM);
-	if (this->socket_xfrm <= 0)
-	{
-		charon->kill(charon, "unable to create XFRM netlink socket");
-	}
-	addr.nl_groups = 0;
-	if (bind(this->socket_xfrm, (struct sockaddr*)&addr, sizeof(addr)))
-	{
-		charon->kill(charon, "unable to bind XFRM netlink socket");
-	}
+	this->public.add_ipsec_interface = (void(*)(kernel_interface_t*, kernel_ipsec_constructor_t))add_ipsec_interface;
+	this->public.remove_ipsec_interface = (void(*)(kernel_interface_t*, kernel_ipsec_constructor_t))remove_ipsec_interface;
+	this->public.add_net_interface = (void(*)(kernel_interface_t*, kernel_net_constructor_t))add_net_interface;
+	this->public.remove_net_interface = (void(*)(kernel_interface_t*, kernel_net_constructor_t))remove_net_interface;
 	
-	/* create and bind XFRM socket for ACQUIRE & EXPIRE */
-	this->socket_xfrm_events = socket(AF_NETLINK, SOCK_RAW, NETLINK_XFRM);
-	if (this->socket_xfrm_events <= 0)
-	{
-		charon->kill(charon, "unable to create XFRM event socket");
-	}
-	addr.nl_groups = XFRMGRP_ACQUIRE | XFRMGRP_EXPIRE;
-	if (bind(this->socket_xfrm_events, (struct sockaddr*)&addr, sizeof(addr)))
-	{
-		charon->kill(charon, "unable to bind XFRM event socket");
-	}
-	
-	this->job = callback_job_create((callback_job_cb_t)receive_events,
-									this, NULL, NULL);
-	charon->processor->queue_job(charon->processor, (job_t*)this->job);
+	this->public.create_interfaces = (void (*)(kernel_interface_t*))create_interfaces;
+	this->public.destroy = (void (*)(kernel_interface_t*))destroy;
 	
-	if (init_address_list(this) != SUCCESS)
-	{
-		charon->kill(charon, "unable to get interface list");
-	}
-	
-	if (this->routing_table)
-	{
-		if (manage_rule(this, RTM_NEWRULE, this->routing_table,
-						this->routing_table_prio) != SUCCESS)
-		{
-			DBG1(DBG_KNL, "unable to create routing table rule");
-		}
-	}
+	this->ipsec_interfaces = linked_list_create();
+	this->net_interfaces = linked_list_create();
+	this->mutex = mutex_create(MUTEX_RECURSIVE);
+	this->ipsec = NULL;
+	this->net = NULL;
 	
 	return &this->public;
 }
-
diff --git a/src/charon/kernel/kernel_interface.h b/src/charon/kernel/kernel_interface.h
index 49928c74b..b3bf907e5 100644
--- a/src/charon/kernel/kernel_interface.h
+++ b/src/charon/kernel/kernel_interface.h
@@ -15,7 +15,7 @@
  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * for more details.
  *
- * $Id: kernel_interface.h 3920 2008-05-08 16:19:11Z tobias $
+ * $Id: kernel_interface.h 4386 2008-10-08 08:23:46Z martin $
  */
 
 /**
@@ -26,45 +26,37 @@
 #ifndef KERNEL_INTERFACE_H_
 #define KERNEL_INTERFACE_H_
 
-typedef enum policy_dir_t policy_dir_t;
 typedef struct kernel_interface_t kernel_interface_t;
 
 #include <utils/host.h>
 #include <crypto/prf_plus.h>
 #include <encoding/payloads/proposal_substructure.h>
 
+#include <kernel/kernel_ipsec.h>
+#include <kernel/kernel_net.h>
 
 /**
- * Direction of a policy. These are equal to those
- * defined in xfrm.h, but we want to stay implementation
- * neutral here.
+ * Constructor function for ipsec kernel interface
  */
-enum policy_dir_t {
-	/** Policy for inbound traffic */
-	POLICY_IN = 0,
-	/** Policy for outbound traffic */
-	POLICY_OUT = 1,
-	/** Policy for forwarded traffic */
-	POLICY_FWD = 2,
-};
+typedef kernel_ipsec_t* (*kernel_ipsec_constructor_t)(void);
+
+/**
+ * Constructor function for network kernel interface
+ */
+typedef kernel_net_t* (*kernel_net_constructor_t)(void);
 
 /**
- * Interface to the kernel.
+ * Manager and wrapper for different kernel interfaces.
  * 
  * The kernel interface handles the communication with the kernel
- * for SA and policy management. It allows setup of these, and provides 
- * further the handling of kernel events.
- * Policy information are cached in the interface. This is necessary to do
- * reference counting. The Linux kernel does not allow the same policy
- * installed twice, but we need this as CHILD_SA exist multiple times
- * when rekeying. Thats why we do reference counting of policies.
+ * for SA and policy management and interface and IP address management.
  */
 struct kernel_interface_t {
 
 	/**
 	 * Get a SPI from the kernel.
 	 *
-	 * @warning get_spi() implicitely creates an SA with
+	 * @warning get_spi() implicitly creates an SA with
 	 * the allocated SPI, therefore the replace flag
 	 * in add_sa() must be set when installing this SA.
 	 * 
@@ -107,7 +99,7 @@ struct kernel_interface_t {
 	 * @param protocol		protocol for this SA (ESP/AH)
 	 * @param reqid			unique ID for this SA
 	 * @param expire_soft	lifetime in seconds before rekeying
-	 * @param expire_hard	lieftime in seconds before delete
+	 * @param expire_hard	lifetime in seconds before delete
 	 * @param enc_alg		Algorithm to use for encryption (ESP only)
 	 * @param enc_size		key length of encryption algorithm, if dynamic
 	 * @param int_alg		Algorithm to use for integrity protection
@@ -125,7 +117,7 @@ struct kernel_interface_t {
 						u_int64_t expire_soft, u_int64_t expire_hard,
 					    u_int16_t enc_alg, u_int16_t enc_size,
 					    u_int16_t int_alg, u_int16_t int_size,
-						prf_plus_t *prf_plus, mode_t mode,
+						prf_plus_t *prf_plus, ipsec_mode_t mode,
 						u_int16_t ipcomp, bool encap,
 						bool update);
 	
@@ -167,7 +159,7 @@ struct kernel_interface_t {
 						  protocol_id_t protocol, u_int32_t *use_time);
 	
 	/**
-	 * Delete a previusly installed SA from the SAD.
+	 * Delete a previously installed SA from the SAD.
 	 * 
 	 * @param dst			destination address for this SA
 	 * @param spi			SPI allocated by us or remote peer
@@ -189,7 +181,7 @@ struct kernel_interface_t {
 	 * @param dst_ts		traffic selector to match traffic dest
 	 * @param direction		direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
 	 * @param protocol		protocol to use to protect traffic (AH/ESP)
-	 * @param reqid			uniqe ID of an SA to use to enforce policy
+	 * @param reqid			unique ID of an SA to use to enforce policy
 	 * @param high_prio		if TRUE, uses a higher priority than any with FALSE
 	 * @param mode			mode of SA (tunnel, transport)
 	 * @param ipcomp		the IPComp transform used
@@ -200,7 +192,7 @@ struct kernel_interface_t {
 							traffic_selector_t *src_ts,
 							traffic_selector_t *dst_ts,
 							policy_dir_t direction, protocol_id_t protocol,
-							u_int32_t reqid, bool high_prio, mode_t mode,
+							u_int32_t reqid, bool high_prio, ipsec_mode_t mode,
 							u_int16_t ipcomp);
 	
 	/**
@@ -243,11 +235,26 @@ struct kernel_interface_t {
 	 *
 	 * Does a route lookup to get the source address used to reach dest.
 	 * The returned host is allocated and must be destroyed.
+	 * An optional src address can be used to check if a route is available
+	 * for given source to dest.
 	 *
 	 * @param dest			target destination address
+	 * @param src			source address to check, or NULL
 	 * @return				outgoing source address, NULL if unreachable
 	 */
-	host_t* (*get_source_addr)(kernel_interface_t *this, host_t *dest);
+	host_t* (*get_source_addr)(kernel_interface_t *this,
+							   host_t *dest, host_t *src);
+	
+	/**
+	 * Get the next hop for a destination.
+	 *
+	 * Does a route lookup to get the next hop used to reach dest.
+	 * The returned host is allocated and must be destroyed.
+	 *
+	 * @param dest			target destination address
+	 * @return				next hop address, NULL if unreachable
+	 */
+	host_t* (*get_nexthop)(kernel_interface_t *this, host_t *dest);
 	
 	/**
 	 * Get the interface name of a local address.
@@ -258,15 +265,18 @@ struct kernel_interface_t {
 	char* (*get_interface) (kernel_interface_t *this, host_t *host);
 	
 	/**
-	 * Creates an iterator over all local addresses.
-	 *
+	 * Creates an enumerator over all local addresses.
+	 * 
 	 * This function blocks an internal cached address list until the
-	 * iterator gets destroyed.
-	 * These hosts are read-only, do not modify or free.
-	 *
-	 * @return 				iterator over host_t's
+	 * enumerator gets destroyed.
+	 * The hosts are read-only, do not modify of free.
+	 * 
+	 * @param include_down_ifaces	TRUE to enumerate addresses from down interfaces
+	 * @param include_virtual_ips	TRUE to enumerate virtual ip addresses
+	 * @return						enumerator over host_t's
 	 */
-	iterator_t *(*create_address_iterator) (kernel_interface_t *this);
+	enumerator_t *(*create_address_enumerator) (kernel_interface_t *this,
+						bool include_down_ifaces, bool include_virtual_ips);
 	
 	/**
 	 * Add a virtual IP to an interface.
@@ -294,9 +304,73 @@ struct kernel_interface_t {
 	status_t (*del_ip) (kernel_interface_t *this, host_t *virtual_ip);
 	
 	/**
-	 * Destroys a kernel_interface object.
+	 * Add a route.
+	 * 
+	 * @param dst_net		destination net
+	 * @param prefixlen		destination net prefix length
+	 * @param gateway		gateway for this route
+	 * @param src_ip		sourc ip of the route
+	 * @param if_name		name of the interface the route is bound to
+	 * @return				SUCCESS if operation completed
+	 * 						ALREADY_DONE if the route already exists
+	 */
+	status_t (*add_route) (kernel_interface_t *this, chunk_t dst_net, u_int8_t prefixlen,
+								host_t *gateway, host_t *src_ip, char *if_name);
+	
+	/**
+	 * Delete a route.
+	 * 
+	 * @param dst_net		destination net
+	 * @param prefixlen		destination net prefix length
+	 * @param gateway		gateway for this route
+	 * @param src_ip		sourc ip of the route
+	 * @param if_name		name of the interface the route is bound to
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*del_route) (kernel_interface_t *this, chunk_t dst_net, u_int8_t prefixlen,
+								host_t *gateway, host_t *src_ip, char *if_name);
+	
+	/**
+	 * manager methods
+	 */
+	
+	/**
+	 * Register an ipsec kernel interface constructor on the manager.
+	 *
+	 * @param create			constructor to register
+	 */
+	void (*add_ipsec_interface)(kernel_interface_t *this, kernel_ipsec_constructor_t create);
+	
+	/**
+	 * Unregister an ipsec kernel interface constructor.
+	 *
+	 * @param create			constructor to unregister
+	 */
+	void (*remove_ipsec_interface)(kernel_interface_t *this, kernel_ipsec_constructor_t create);
+	
+	/**
+	 * Register a network kernel interface constructor on the manager.
+	 *
+	 * @param create			constructor to register
+	 */
+	void (*add_net_interface)(kernel_interface_t *this, kernel_net_constructor_t create);
+	
+	/**
+	 * Unregister a network kernel interface constructor.
+	 *
+	 * @param create			constructor to unregister
+	 */
+	void (*remove_net_interface)(kernel_interface_t *this, kernel_net_constructor_t create);
+	
+	/**
+	 * Create the kernel interfaces classes.
+	 */
+	void (*create_interfaces)(kernel_interface_t *this);
+	
+	/**
+	 * Destroys a kernel_interface_manager_t object.
 	 */
-	void (*destroy) (kernel_interface_t *kernel_interface);
+	void (*destroy) (kernel_interface_t *this);
 };
 
 /**
@@ -304,4 +378,4 @@ struct kernel_interface_t {
  */
 kernel_interface_t *kernel_interface_create(void);
 
-#endif /*KERNEL_INTERFACE_H_ @} */
+#endif /* KERNEL_INTERFACE_H_ @} */
diff --git a/src/charon/kernel/kernel_ipsec.c b/src/charon/kernel/kernel_ipsec.c
new file mode 100644
index 000000000..bae8ee125
--- /dev/null
+++ b/src/charon/kernel/kernel_ipsec.c
@@ -0,0 +1,26 @@
+/*
+ * 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.
+ *
+ * $Id: kernel_ipsec.c 4358 2008-09-25 13:56:23Z tobias $
+ */
+
+#include "kernel_ipsec.h"
+
+ENUM(ipsec_mode_names, MODE_TRANSPORT, MODE_BEET,
+	"TRANSPORT",
+	"TUNNEL",
+	"2",
+	"3",
+	"BEET",
+);
diff --git a/src/charon/kernel/kernel_ipsec.h b/src/charon/kernel/kernel_ipsec.h
new file mode 100644
index 000000000..67786a74f
--- /dev/null
+++ b/src/charon/kernel/kernel_ipsec.h
@@ -0,0 +1,266 @@
+/*
+ * Copyright (C) 2006-2008 Tobias Brunner
+ * Copyright (C) 2006 Daniel Roethlisberger
+ * Copyright (C) 2005-2006 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * 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.
+ *
+ * $Id: kernel_ipsec.h 4358 2008-09-25 13:56:23Z tobias $
+ */
+
+/**
+ * @defgroup kernel_ipsec kernel_ipsec
+ * @{ @ingroup kernel
+ */
+
+#ifndef KERNEL_IPSEC_H_
+#define KERNEL_IPSEC_H_
+
+typedef enum ipsec_mode_t ipsec_mode_t;
+typedef enum policy_dir_t policy_dir_t;
+typedef struct kernel_ipsec_t kernel_ipsec_t;
+
+#include <utils/host.h>
+#include <crypto/prf_plus.h>
+#include <encoding/payloads/proposal_substructure.h>
+
+/**
+ * Mode of an CHILD_SA.
+ *
+ * These are equal to those defined in XFRM, so don't change.
+ */
+enum ipsec_mode_t {
+	/** transport mode, no inner address */
+	MODE_TRANSPORT = 0,
+	/** tunnel mode, inner and outer addresses */
+	MODE_TUNNEL = 1,
+	/** BEET mode, tunnel mode but fixed, bound inner addresses */
+	MODE_BEET = 4,
+};
+
+/**
+ * enum names for ipsec_mode_t.
+ */
+extern enum_name_t *ipsec_mode_names;
+
+/**
+ * Direction of a policy. These are equal to those
+ * defined in xfrm.h, but we want to stay implementation
+ * neutral here.
+ */
+enum policy_dir_t {
+	/** Policy for inbound traffic */
+	POLICY_IN = 0,
+	/** Policy for outbound traffic */
+	POLICY_OUT = 1,
+	/** Policy for forwarded traffic */
+	POLICY_FWD = 2,
+};
+
+/**
+ * Interface to the ipsec subsystem of the kernel.
+ * 
+ * The kernel ipsec interface handles the communication with the kernel
+ * for SA and policy management. It allows setup of these, and provides 
+ * further the handling of kernel events.
+ * Policy information are cached in the interface. This is necessary to do
+ * reference counting. The Linux kernel does not allow the same policy
+ * installed twice, but we need this as CHILD_SA exist multiple times
+ * when rekeying. Thats why we do reference counting of policies.
+ */
+struct kernel_ipsec_t {
+	
+	/**
+	 * Get a SPI from the kernel.
+	 *
+	 * @warning get_spi() implicitly creates an SA with
+	 * the allocated SPI, therefore the replace flag
+	 * in add_sa() must be set when installing this SA.
+	 * 
+	 * @param src		source address of SA
+	 * @param dst		destination address of SA
+	 * @param protocol	protocol for SA (ESP/AH)
+	 * @param reqid		unique ID for this SA
+	 * @param spi		allocated spi
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*get_spi)(kernel_ipsec_t *this, host_t *src, host_t *dst, 
+						protocol_id_t protocol, u_int32_t reqid, u_int32_t *spi);
+	
+	/**
+	 * Get a Compression Parameter Index (CPI) from the kernel.
+	 * 
+	 * @param src		source address of SA
+	 * @param dst		destination address of SA
+	 * @param reqid		unique ID for the corresponding SA
+	 * @param cpi		allocated cpi
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*get_cpi)(kernel_ipsec_t *this, host_t *src, host_t *dst, 
+						u_int32_t reqid, u_int16_t *cpi);
+	
+	/**
+	 * Add an SA to the SAD.
+	 * 
+	 * add_sa() may update an already allocated
+	 * SPI (via get_spi). In this case, the replace
+	 * flag must be set.
+	 * This function does install a single SA for a
+	 * single protocol in one direction. The kernel-interface
+	 * gets the keys itself from the PRF, as we don't know
+	 * his algorithms and key sizes.
+	 * 
+	 * @param src			source address for this SA
+	 * @param dst			destination address for this SA
+	 * @param spi			SPI allocated by us or remote peer
+	 * @param protocol		protocol for this SA (ESP/AH)
+	 * @param reqid			unique ID for this SA
+	 * @param expire_soft	lifetime in seconds before rekeying
+	 * @param expire_hard	lifetime in seconds before delete
+	 * @param enc_alg		Algorithm to use for encryption (ESP only)
+	 * @param enc_size		key length of encryption algorithm, if dynamic
+	 * @param int_alg		Algorithm to use for integrity protection
+	 * @param int_size		key length of integrity algorithm, if dynamic
+	 * @param prf_plus		PRF to derive keys from
+	 * @param mode			mode of the SA (tunnel, transport)
+	 * @param ipcomp		IPComp transform to use
+	 * @param encap			enable UDP encapsulation for NAT traversal
+	 * @param replace		Should an already installed SA be updated?
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*add_sa) (kernel_ipsec_t *this,
+						host_t *src, host_t *dst, u_int32_t spi,
+						protocol_id_t protocol, u_int32_t reqid,
+						u_int64_t expire_soft, u_int64_t expire_hard,
+					    u_int16_t enc_alg, u_int16_t enc_size,
+					    u_int16_t int_alg, u_int16_t int_size,
+						prf_plus_t *prf_plus, ipsec_mode_t mode,
+						u_int16_t ipcomp, bool encap,
+						bool update);
+	
+	/**
+	 * Update the hosts on an installed SA.
+	 *
+	 * We cannot directly update the destination address as the kernel
+	 * requires the spi, the protocol AND the destination address (and family)
+	 * to identify SAs. Therefore if the destination address changed we
+	 * create a new SA and delete the old one.
+	 *
+	 * @param spi			SPI of the SA
+	 * @param protocol		protocol for this SA (ESP/AH)
+	 * @param src			current source address
+	 * @param dst			current destination address
+	 * @param new_src		new source address
+	 * @param new_dst		new destination address
+	 * @param encap			use UDP encapsulation
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*update_sa)(kernel_ipsec_t *this,
+						  u_int32_t spi, protocol_id_t protocol,
+						  host_t *src, host_t *dst, 
+						  host_t *new_src, host_t *new_dst, bool encap);
+	
+	/**
+	 * Query the use time of an SA.
+	 *
+	 * The use time of an SA is not the time of the last usage, but 
+	 * the time of the first usage of the SA.
+	 * 
+	 * @param dst			destination address for this SA
+	 * @param spi			SPI allocated by us or remote peer
+	 * @param protocol		protocol for this SA (ESP/AH)
+	 * @param use_time		pointer receives the time of this SA's last use
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*query_sa) (kernel_ipsec_t *this, host_t *dst, u_int32_t spi, 
+						  protocol_id_t protocol, u_int32_t *use_time);
+	
+	/**
+	 * Delete a previusly installed SA from the SAD.
+	 * 
+	 * @param dst			destination address for this SA
+	 * @param spi			SPI allocated by us or remote peer
+	 * @param protocol		protocol for this SA (ESP/AH)
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*del_sa) (kernel_ipsec_t *this, host_t *dst, u_int32_t spi,
+						protocol_id_t protocol);
+	
+	/**
+	 * Add a policy to the SPD.
+	 * 
+	 * A policy is always associated to an SA. Traffic which matches a
+	 * policy is handled by the SA with the same reqid.
+	 * 
+	 * @param src			source address of SA
+	 * @param dst			dest address of SA
+	 * @param src_ts		traffic selector to match traffic source
+	 * @param dst_ts		traffic selector to match traffic dest
+	 * @param direction		direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
+	 * @param protocol		protocol to use to protect traffic (AH/ESP)
+	 * @param reqid			unique ID of an SA to use to enforce policy
+	 * @param high_prio		if TRUE, uses a higher priority than any with FALSE
+	 * @param mode			mode of SA (tunnel, transport)
+	 * @param ipcomp		the IPComp transform used
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*add_policy) (kernel_ipsec_t *this,
+							host_t *src, host_t *dst,
+							traffic_selector_t *src_ts,
+							traffic_selector_t *dst_ts,
+							policy_dir_t direction, protocol_id_t protocol,
+							u_int32_t reqid, bool high_prio, ipsec_mode_t mode,
+							u_int16_t ipcomp);
+	
+	/**
+	 * Query the use time of a policy.
+	 *
+	 * The use time of a policy is the time the policy was used
+	 * for the last time.
+	 * 
+	 * @param src_ts		traffic selector to match traffic source
+	 * @param dst_ts		traffic selector to match traffic dest
+	 * @param direction		direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
+	 * @param[out] use_time	the time of this SA's last use
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*query_policy) (kernel_ipsec_t *this,
+							  traffic_selector_t *src_ts, 
+							  traffic_selector_t *dst_ts,
+							  policy_dir_t direction, u_int32_t *use_time);
+	
+	/**
+	 * Remove a policy from the SPD.
+	 *
+	 * The kernel interface implements reference counting for policies.
+	 * If the same policy is installed multiple times (in the case of rekeying),
+	 * the reference counter is increased. del_policy() decreases the ref counter
+	 * and removes the policy only when no more references are available.
+	 *
+	 * @param src_ts		traffic selector to match traffic source
+	 * @param dst_ts		traffic selector to match traffic dest
+	 * @param direction		direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*del_policy) (kernel_ipsec_t *this,
+							traffic_selector_t *src_ts, 
+							traffic_selector_t *dst_ts,
+							policy_dir_t direction);
+	
+	/**
+	 * Destroy the implementation.
+	 */
+	void (*destroy) (kernel_ipsec_t *this);
+};
+
+#endif /* KERNEL_IPSEC_H_ @} */
diff --git a/src/charon/kernel/kernel_net.h b/src/charon/kernel/kernel_net.h
new file mode 100644
index 000000000..80a71ebc6
--- /dev/null
+++ b/src/charon/kernel/kernel_net.h
@@ -0,0 +1,145 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2007 Martin Willi
+ * 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.
+ *
+ * $Id: kernel_net.h 4386 2008-10-08 08:23:46Z martin $
+ */
+
+/**
+ * @defgroup kernel_net kernel_net
+ * @{ @ingroup kernel
+ */
+
+#ifndef KERNEL_NET_H_
+#define KERNEL_NET_H_
+
+typedef struct kernel_net_t kernel_net_t;
+
+#include <utils/enumerator.h>
+#include <utils/host.h>
+
+/**
+ * Interface to the network subsystem of the kernel.
+ * 
+ * The kernel network interface handles the communication with the kernel
+ * for interface and IP address management.
+ */
+struct kernel_net_t {
+
+	/**
+	 * Get our outgoing source address for a destination.
+	 *
+	 * Does a route lookup to get the source address used to reach dest.
+	 * The returned host is allocated and must be destroyed.
+	 * An optional src address can be used to check if a route is available
+	 * for given source to dest.
+	 *
+	 * @param dest			target destination address
+	 * @param src			source address to check, or NULL
+	 * @return				outgoing source address, NULL if unreachable
+	 */
+	host_t* (*get_source_addr)(kernel_net_t *this, host_t *dest, host_t *src);
+	
+	/**
+	 * Get the next hop for a destination.
+	 *
+	 * Does a route lookup to get the next hop used to reach dest.
+	 * The returned host is allocated and must be destroyed.
+	 *
+	 * @param dest			target destination address
+	 * @return				next hop address, NULL if unreachable
+	 */
+	host_t* (*get_nexthop)(kernel_net_t *this, host_t *dest);
+	
+	/**
+	 * Get the interface name of a local address.
+	 *
+	 * @param host			address to get interface name from
+	 * @return 				allocated interface name, or NULL if not found
+	 */
+	char* (*get_interface) (kernel_net_t *this, host_t *host);
+	
+	/**
+	 * Creates an enumerator over all local addresses.
+	 * 
+	 * This function blocks an internal cached address list until the
+	 * enumerator gets destroyed.
+	 * The hosts are read-only, do not modify of free.
+	 * 
+	 * @param include_down_ifaces	TRUE to enumerate addresses from down interfaces
+	 * @param include_virtual_ips	TRUE to enumerate virtual ip addresses
+	 * @return						enumerator over host_t's
+	 */
+	enumerator_t *(*create_address_enumerator) (kernel_net_t *this,
+						bool include_down_ifaces, bool include_virtual_ips);
+	
+	/**
+	 * Add a virtual IP to an interface.
+	 *
+	 * Virtual IPs are attached to an interface. If an IP is added multiple
+	 * times, the IP is refcounted and not removed until del_ip() was called
+	 * as many times as add_ip().
+	 * The virtual IP is attached to the interface where the iface_ip is found.
+	 *
+	 * @param virtual_ip	virtual ip address to assign
+	 * @param iface_ip		IP of an interface to attach virtual IP
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*add_ip) (kernel_net_t *this, host_t *virtual_ip,
+						host_t *iface_ip);
+	
+	/**
+	 * Remove a virtual IP from an interface.
+	 *
+	 * The kernel interface uses refcounting, see add_ip().
+	 *
+	 * @param virtual_ip	virtual ip address to assign
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*del_ip) (kernel_net_t *this, host_t *virtual_ip);
+	
+	/**
+	 * Add a route.
+	 * 
+	 * @param dst_net		destination net
+	 * @param prefixlen		destination net prefix length
+	 * @param gateway		gateway for this route
+	 * @param src_ip		sourc ip of the route
+	 * @param if_name		name of the interface the route is bound to
+	 * @return				SUCCESS if operation completed
+	 * 						ALREADY_DONE if the route already exists
+	 */
+	status_t (*add_route) (kernel_net_t *this, chunk_t dst_net, u_int8_t prefixlen,
+								host_t *gateway, host_t *src_ip, char *if_name);
+	
+	/**
+	 * Delete a route.
+	 * 
+	 * @param dst_net		destination net
+	 * @param prefixlen		destination net prefix length
+	 * @param gateway		gateway for this route
+	 * @param src_ip		sourc ip of the route
+	 * @param if_name		name of the interface the route is bound to
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*del_route) (kernel_net_t *this, chunk_t dst_net, u_int8_t prefixlen,
+								host_t *gateway, host_t *src_ip, char *if_name);
+	
+	/**
+	 * Destroy the implementation.
+	 */
+	void (*destroy) (kernel_net_t *this);
+};
+
+#endif /* KERNEL_NET_H_ @} */