Imported Upstream version 5.4.0

1 files changed, 1085 insertions, 0 deletions

diff --git a/src/libcharon/kernel/kernel_interface.c b/src/libcharon/kernel/kernel_interface.c
new file mode 100644
index 000000000..40c4ee589
--- /dev/null
+++ b/src/libcharon/kernel/kernel_interface.c
@@ -0,0 +1,1085 @@
+/*
+ * Copyright (C) 2008-2015 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/*
+ * Copyright (c) 2012 Nanoteq Pty Ltd
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "kernel_interface.h"
+
+#include <utils/debug.h>
+#include <threading/mutex.h>
+#include <collections/linked_list.h>
+#include <collections/hashtable.h>
+#include <collections/array.h>
+
+typedef struct private_kernel_interface_t private_kernel_interface_t;
+
+typedef struct kernel_algorithm_t kernel_algorithm_t;
+
+/**
+ * Mapping of IKE algorithms to kernel-specific algorithm identifiers
+ */
+struct kernel_algorithm_t {
+
+	/**
+	 * Transform type of the algorithm
+	 */
+	transform_type_t type;
+
+	/**
+	 * Identifier specified in IKE
+	 */
+	u_int16_t ike;
+
+	/**
+	 * Identifier as defined in pfkeyv2.h
+	 */
+	u_int16_t kernel;
+
+	/**
+	 * Name of the algorithm in linux crypto API
+	 */
+	char *name;
+};
+
+/**
+ * Private data of a kernel_interface_t object.
+ */
+struct private_kernel_interface_t {
+
+	/**
+	 * Public part of kernel_interface_t object.
+	 */
+	kernel_interface_t public;
+
+	/**
+	 * Registered IPsec constructor
+	 */
+	kernel_ipsec_constructor_t ipsec_constructor;
+
+	/**
+	 * Registered net constructor
+	 */
+	kernel_net_constructor_t net_constructor;
+
+	/**
+	 * ipsec interface
+	 */
+	kernel_ipsec_t *ipsec;
+
+	/**
+	 * network interface
+	 */
+	kernel_net_t *net;
+
+	/**
+	 * mutex for listeners
+	 */
+	mutex_t *mutex;
+
+	/**
+	 * list of registered listeners
+	 */
+	linked_list_t *listeners;
+
+	/**
+	 * Reqid entries indexed by reqids
+	 */
+	hashtable_t *reqids;
+
+	/**
+	 * Reqid entries indexed by traffic selectors
+	 */
+	hashtable_t *reqids_by_ts;
+
+	/**
+	 * mutex for algorithm mappings
+	 */
+	mutex_t *mutex_algs;
+
+	/**
+	 * List of algorithm mappings (kernel_algorithm_t*)
+	 */
+	linked_list_t *algorithms;
+
+	/**
+	 * List of interface names to include or exclude (char*), NULL if interfaces
+	 * are not filtered
+	 */
+	linked_list_t *ifaces_filter;
+
+	/**
+	 * TRUE to exclude interfaces listed in ifaces_filter, FALSE to consider
+	 * only those listed there
+	 */
+	bool ifaces_exclude;
+};
+
+METHOD(kernel_interface_t, get_features, kernel_feature_t,
+	private_kernel_interface_t *this)
+{
+	kernel_feature_t features = 0;
+
+	if (this->ipsec && this->ipsec->get_features)
+	{
+		features |= this->ipsec->get_features(this->ipsec);
+	}
+	if (this->net && this->net->get_features)
+	{
+		features |= this->net->get_features(this->net);
+	}
+	return features;
+}
+
+METHOD(kernel_interface_t, get_spi, status_t,
+	private_kernel_interface_t *this, host_t *src, host_t *dst,
+	u_int8_t protocol, u_int32_t *spi)
+{
+	if (!this->ipsec)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->ipsec->get_spi(this->ipsec, src, dst, protocol, spi);
+}
+
+METHOD(kernel_interface_t, get_cpi, status_t,
+	private_kernel_interface_t *this, host_t *src, host_t *dst,
+	u_int16_t *cpi)
+{
+	if (!this->ipsec)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->ipsec->get_cpi(this->ipsec, src, dst, cpi);
+}
+
+/**
+ * Reqid mapping entry
+ */
+typedef struct {
+	/** allocated reqid */
+	u_int32_t reqid;
+	/** references to this entry */
+	u_int refs;
+	/** inbound mark used for SA */
+	mark_t mark_in;
+	/** outbound mark used for SA */
+	mark_t mark_out;
+	/** local traffic selectors */
+	array_t *local;
+	/** remote traffic selectors */
+	array_t *remote;
+} reqid_entry_t;
+
+/**
+ * Destroy a reqid mapping entry
+ */
+static void reqid_entry_destroy(reqid_entry_t *entry)
+{
+	array_destroy_offset(entry->local, offsetof(traffic_selector_t, destroy));
+	array_destroy_offset(entry->remote, offsetof(traffic_selector_t, destroy));
+	free(entry);
+}
+
+/**
+ * Hashtable hash function for reqid entries using reqid as key
+ */
+static u_int hash_reqid(reqid_entry_t *entry)
+{
+	return chunk_hash_inc(chunk_from_thing(entry->reqid),
+				chunk_hash_inc(chunk_from_thing(entry->mark_in),
+					chunk_hash(chunk_from_thing(entry->mark_out))));
+}
+
+/**
+ * Hashtable equals function for reqid entries using reqid as key
+ */
+static bool equals_reqid(reqid_entry_t *a, reqid_entry_t *b)
+{
+	return a->reqid == b->reqid &&
+		   a->mark_in.value == b->mark_in.value &&
+		   a->mark_in.mask == b->mark_in.mask &&
+		   a->mark_out.value == b->mark_out.value &&
+		   a->mark_out.mask == b->mark_out.mask;
+}
+
+/**
+ * Hash an array of traffic selectors
+ */
+static u_int hash_ts_array(array_t *array, u_int hash)
+{
+	enumerator_t *enumerator;
+	traffic_selector_t *ts;
+
+	enumerator = array_create_enumerator(array);
+	while (enumerator->enumerate(enumerator, &ts))
+	{
+		hash = ts->hash(ts, hash);
+	}
+	enumerator->destroy(enumerator);
+
+	return hash;
+}
+
+/**
+ * Hashtable hash function for reqid entries using traffic selectors as key
+ */
+static u_int hash_reqid_by_ts(reqid_entry_t *entry)
+{
+	return hash_ts_array(entry->local, hash_ts_array(entry->remote,
+			chunk_hash_inc(chunk_from_thing(entry->mark_in),
+				chunk_hash(chunk_from_thing(entry->mark_out)))));
+}
+
+/**
+ * Compare two array with traffic selectors for equality
+ */
+static bool ts_array_equals(array_t *a, array_t *b)
+{
+	traffic_selector_t *tsa, *tsb;
+	enumerator_t *ae, *be;
+	bool equal = TRUE;
+
+	if (array_count(a) != array_count(b))
+	{
+		return FALSE;
+	}
+
+	ae = array_create_enumerator(a);
+	be = array_create_enumerator(b);
+	while (equal && ae->enumerate(ae, &tsa) && be->enumerate(be, &tsb))
+	{
+		equal = tsa->equals(tsa, tsb);
+	}
+	ae->destroy(ae);
+	be->destroy(be);
+
+	return equal;
+}
+
+/**
+ * Hashtable equals function for reqid entries using traffic selectors as key
+ */
+static bool equals_reqid_by_ts(reqid_entry_t *a, reqid_entry_t *b)
+{
+	return ts_array_equals(a->local, b->local) &&
+		   ts_array_equals(a->remote, b->remote) &&
+		   a->mark_in.value == b->mark_in.value &&
+		   a->mark_in.mask == b->mark_in.mask &&
+		   a->mark_out.value == b->mark_out.value &&
+		   a->mark_out.mask == b->mark_out.mask;
+}
+
+/**
+ * Create an array from copied traffic selector list items
+ */
+static array_t *array_from_ts_list(linked_list_t *list)
+{
+	enumerator_t *enumerator;
+	traffic_selector_t *ts;
+	array_t *array;
+
+	array = array_create(0, 0);
+
+	enumerator = list->create_enumerator(list);
+	while (enumerator->enumerate(enumerator, &ts))
+	{
+		array_insert(array, ARRAY_TAIL, ts->clone(ts));
+	}
+	enumerator->destroy(enumerator);
+
+	return array;
+}
+
+METHOD(kernel_interface_t, alloc_reqid, status_t,
+	private_kernel_interface_t *this,
+	linked_list_t *local_ts, linked_list_t *remote_ts,
+	mark_t mark_in, mark_t mark_out, u_int32_t *reqid)
+{
+	static u_int32_t counter = 0;
+	reqid_entry_t *entry = NULL, *tmpl;
+	status_t status = SUCCESS;
+
+	INIT(tmpl,
+		.local = array_from_ts_list(local_ts),
+		.remote = array_from_ts_list(remote_ts),
+		.mark_in = mark_in,
+		.mark_out = mark_out,
+		.reqid = *reqid,
+	);
+
+	this->mutex->lock(this->mutex);
+	if (tmpl->reqid)
+	{
+		/* search by reqid if given */
+		entry = this->reqids->get(this->reqids, tmpl);
+	}
+	if (entry)
+	{
+		/* we don't require a traffic selector match for explicit reqids,
+		 * as we wan't to reuse a reqid for trap-triggered policies that
+		 * got narrowed during negotiation. */
+		reqid_entry_destroy(tmpl);
+	}
+	else
+	{
+		/* search by traffic selectors */
+		entry = this->reqids_by_ts->get(this->reqids_by_ts, tmpl);
+		if (entry)
+		{
+			reqid_entry_destroy(tmpl);
+		}
+		else
+		{
+			/* none found, create a new entry, allocating a reqid */
+			entry = tmpl;
+			entry->reqid = ++counter;
+			this->reqids_by_ts->put(this->reqids_by_ts, entry, entry);
+			this->reqids->put(this->reqids, entry, entry);
+		}
+		*reqid = entry->reqid;
+	}
+	entry->refs++;
+	this->mutex->unlock(this->mutex);
+
+	return status;
+}
+
+METHOD(kernel_interface_t, release_reqid, status_t,
+	private_kernel_interface_t *this, u_int32_t reqid,
+	mark_t mark_in, mark_t mark_out)
+{
+	reqid_entry_t *entry, tmpl = {
+		.reqid = reqid,
+		.mark_in = mark_in,
+		.mark_out = mark_out,
+	};
+
+	this->mutex->lock(this->mutex);
+	entry = this->reqids->remove(this->reqids, &tmpl);
+	if (entry)
+	{
+		if (--entry->refs == 0)
+		{
+			entry = this->reqids_by_ts->remove(this->reqids_by_ts, entry);
+			if (entry)
+			{
+				reqid_entry_destroy(entry);
+			}
+		}
+		else
+		{
+			this->reqids->put(this->reqids, entry, entry);
+		}
+	}
+	this->mutex->unlock(this->mutex);
+
+	if (entry)
+	{
+		return SUCCESS;
+	}
+	return NOT_FOUND;
+}
+
+METHOD(kernel_interface_t, add_sa, status_t,
+	private_kernel_interface_t *this, host_t *src, host_t *dst,
+	u_int32_t spi, u_int8_t protocol, u_int32_t reqid, mark_t mark,
+	u_int32_t tfc, lifetime_cfg_t *lifetime, u_int16_t enc_alg, chunk_t enc_key,
+	u_int16_t int_alg, chunk_t int_key, ipsec_mode_t mode,
+	u_int16_t ipcomp, u_int16_t cpi, u_int32_t replay_window,
+	bool initiator, bool encap, bool esn, bool inbound, bool update,
+	linked_list_t *src_ts, linked_list_t *dst_ts)
+{
+	if (!this->ipsec)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->ipsec->add_sa(this->ipsec, src, dst, spi, protocol, reqid,
+				mark, tfc, lifetime, enc_alg, enc_key, int_alg, int_key, mode,
+				ipcomp, cpi, replay_window, initiator, encap, esn, inbound,
+				update, src_ts, dst_ts);
+}
+
+METHOD(kernel_interface_t, update_sa, status_t,
+	private_kernel_interface_t *this, u_int32_t spi, u_int8_t protocol,
+	u_int16_t cpi, host_t *src, host_t *dst, host_t *new_src, host_t *new_dst,
+	bool encap, bool new_encap, mark_t mark)
+{
+	if (!this->ipsec)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->ipsec->update_sa(this->ipsec, spi, protocol, cpi, src, dst,
+								  new_src, new_dst, encap, new_encap, mark);
+}
+
+METHOD(kernel_interface_t, query_sa, status_t,
+	private_kernel_interface_t *this, host_t *src, host_t *dst,
+	u_int32_t spi, u_int8_t protocol, mark_t mark,
+	u_int64_t *bytes, u_int64_t *packets, time_t *time)
+{
+	if (!this->ipsec)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->ipsec->query_sa(this->ipsec, src, dst, spi, protocol, mark,
+								 bytes, packets, time);
+}
+
+METHOD(kernel_interface_t, del_sa, status_t,
+	private_kernel_interface_t *this, host_t *src, host_t *dst, u_int32_t spi,
+	u_int8_t protocol, u_int16_t cpi, mark_t mark)
+{
+	if (!this->ipsec)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->ipsec->del_sa(this->ipsec, src, dst, spi, protocol, cpi, mark);
+}
+
+METHOD(kernel_interface_t, flush_sas, status_t,
+	private_kernel_interface_t *this)
+{
+	if (!this->ipsec)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->ipsec->flush_sas(this->ipsec);
+}
+
+METHOD(kernel_interface_t, add_policy, status_t,
+	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, policy_type_t type, ipsec_sa_cfg_t *sa,
+	mark_t mark, policy_priority_t priority)
+{
+	if (!this->ipsec)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->ipsec->add_policy(this->ipsec, src, dst, src_ts, dst_ts,
+								   direction, type, sa, mark, priority);
+}
+
+METHOD(kernel_interface_t, query_policy, status_t,
+	private_kernel_interface_t *this, traffic_selector_t *src_ts,
+	traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark,
+	time_t *use_time)
+{
+	if (!this->ipsec)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->ipsec->query_policy(this->ipsec, src_ts, dst_ts,
+									 direction, mark, use_time);
+}
+
+METHOD(kernel_interface_t, del_policy, status_t,
+	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, policy_type_t type, ipsec_sa_cfg_t *sa,
+	mark_t mark, policy_priority_t priority)
+{
+	if (!this->ipsec)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->ipsec->del_policy(this->ipsec, src, dst, src_ts, dst_ts,
+								   direction, type, sa, mark, priority);
+}
+
+METHOD(kernel_interface_t, flush_policies, status_t,
+	private_kernel_interface_t *this)
+{
+	if (!this->ipsec)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->ipsec->flush_policies(this->ipsec);
+}
+
+METHOD(kernel_interface_t, get_source_addr, host_t*,
+	private_kernel_interface_t *this, host_t *dest, host_t *src)
+{
+	if (!this->net)
+	{
+		return NULL;
+	}
+	return this->net->get_source_addr(this->net, dest, src);
+}
+
+METHOD(kernel_interface_t, get_nexthop, host_t*,
+	private_kernel_interface_t *this, host_t *dest, int prefix, host_t *src)
+{
+	if (!this->net)
+	{
+		return NULL;
+	}
+	return this->net->get_nexthop(this->net, dest, prefix, src);
+}
+
+METHOD(kernel_interface_t, get_interface, bool,
+	private_kernel_interface_t *this, host_t *host, char **name)
+{
+	if (!this->net)
+	{
+		return NULL;
+	}
+	return this->net->get_interface(this->net, host, name);
+}
+
+METHOD(kernel_interface_t, create_address_enumerator, enumerator_t*,
+	private_kernel_interface_t *this, kernel_address_type_t which)
+{
+	if (!this->net)
+	{
+		return enumerator_create_empty();
+	}
+	return this->net->create_address_enumerator(this->net, which);
+}
+
+METHOD(kernel_interface_t, add_ip, status_t,
+	private_kernel_interface_t *this, host_t *virtual_ip, int prefix,
+	char *iface)
+{
+	if (!this->net)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->net->add_ip(this->net, virtual_ip, prefix, iface);
+}
+
+METHOD(kernel_interface_t, del_ip, status_t,
+	private_kernel_interface_t *this, host_t *virtual_ip, int prefix, bool wait)
+{
+	if (!this->net)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->net->del_ip(this->net, virtual_ip, prefix, wait);
+}
+
+METHOD(kernel_interface_t, add_route, status_t,
+	private_kernel_interface_t *this, chunk_t dst_net,
+	u_int8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name)
+{
+	if (!this->net)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->net->add_route(this->net, dst_net, prefixlen, gateway,
+								src_ip, if_name);
+}
+
+METHOD(kernel_interface_t, del_route, status_t,
+	private_kernel_interface_t *this, chunk_t dst_net,
+	u_int8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name)
+{
+	if (!this->net)
+	{
+		return NOT_SUPPORTED;
+	}
+	return this->net->del_route(this->net, dst_net, prefixlen, gateway,
+								src_ip, if_name);
+}
+
+METHOD(kernel_interface_t, bypass_socket, bool,
+	private_kernel_interface_t *this, int fd, int family)
+{
+	if (!this->ipsec)
+	{
+		return FALSE;
+	}
+	return this->ipsec->bypass_socket(this->ipsec, fd, family);
+}
+
+METHOD(kernel_interface_t, enable_udp_decap, bool,
+	private_kernel_interface_t *this, int fd, int family, u_int16_t port)
+{
+	if (!this->ipsec)
+	{
+		return FALSE;
+	}
+	return this->ipsec->enable_udp_decap(this->ipsec, fd, family, port);
+}
+
+METHOD(kernel_interface_t, is_interface_usable, bool,
+	private_kernel_interface_t *this, const char *iface)
+{
+	status_t expected;
+
+	if (!this->ifaces_filter)
+	{
+		return TRUE;
+	}
+	expected = this->ifaces_exclude ? NOT_FOUND : SUCCESS;
+	return this->ifaces_filter->find_first(this->ifaces_filter, (void*)streq,
+										   NULL, iface) == expected;
+}
+
+METHOD(kernel_interface_t, all_interfaces_usable, bool,
+	private_kernel_interface_t *this)
+{
+	return this->ifaces_filter == NULL;
+}
+
+METHOD(kernel_interface_t, get_address_by_ts, status_t,
+	private_kernel_interface_t *this, traffic_selector_t *ts,
+	host_t **ip, bool *vip)
+{
+	enumerator_t *addrs;
+	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);
+
+	/* try virtual IPs only first (on all interfaces) */
+	addrs = create_address_enumerator(this,
+									  ADDR_TYPE_ALL ^ ADDR_TYPE_REGULAR);
+	while (addrs->enumerate(addrs, (void**)&host))
+	{
+		if (ts->includes(ts, host))
+		{
+			found = TRUE;
+			*ip = host->clone(host);
+			if (vip)
+			{
+				*vip = TRUE;
+			}
+			break;
+		}
+	}
+	addrs->destroy(addrs);
+
+	if (!found)
+	{	/* then try the regular addresses (on all interfaces) */
+		addrs = create_address_enumerator(this,
+										  ADDR_TYPE_ALL ^ ADDR_TYPE_VIRTUAL);
+		while (addrs->enumerate(addrs, (void**)&host))
+		{
+			if (ts->includes(ts, host))
+			{
+				found = TRUE;
+				*ip = host->clone(host);
+				if (vip)
+				{
+					*vip = FALSE;
+				}
+				break;
+			}
+		}
+		addrs->destroy(addrs);
+	}
+
+	if (!found)
+	{
+		DBG2(DBG_KNL, "no local address found in traffic selector %R", ts);
+		return FAILED;
+	}
+
+	DBG2(DBG_KNL, "using host %H", *ip);
+	return SUCCESS;
+}
+
+
+METHOD(kernel_interface_t, add_ipsec_interface, bool,
+	private_kernel_interface_t *this, kernel_ipsec_constructor_t constructor)
+{
+	if (!this->ipsec)
+	{
+		this->ipsec_constructor = constructor;
+		this->ipsec = constructor();
+		return this->ipsec != NULL;
+	}
+	return FALSE;
+}
+
+METHOD(kernel_interface_t, remove_ipsec_interface, bool,
+	private_kernel_interface_t *this, kernel_ipsec_constructor_t constructor)
+{
+	if (constructor == this->ipsec_constructor && this->ipsec)
+	{
+		this->ipsec->destroy(this->ipsec);
+		this->ipsec = NULL;
+		return TRUE;
+	}
+	return FALSE;
+}
+
+METHOD(kernel_interface_t, add_net_interface, bool,
+	private_kernel_interface_t *this, kernel_net_constructor_t constructor)
+{
+	if (!this->net)
+	{
+		this->net_constructor = constructor;
+		this->net = constructor();
+		return this->net != NULL;
+	}
+	return FALSE;
+}
+
+METHOD(kernel_interface_t, remove_net_interface, bool,
+	private_kernel_interface_t *this, kernel_net_constructor_t constructor)
+{
+	if (constructor == this->net_constructor && this->net)
+	{
+		this->net->destroy(this->net);
+		this->net = NULL;
+		return TRUE;
+	}
+	return FALSE;
+}
+
+METHOD(kernel_interface_t, add_listener, void,
+	private_kernel_interface_t *this, kernel_listener_t *listener)
+{
+	this->mutex->lock(this->mutex);
+	this->listeners->insert_last(this->listeners, listener);
+	this->mutex->unlock(this->mutex);
+}
+
+METHOD(kernel_interface_t, remove_listener, void,
+	private_kernel_interface_t *this, kernel_listener_t *listener)
+{
+	this->mutex->lock(this->mutex);
+	this->listeners->remove(this->listeners, listener, NULL);
+	this->mutex->unlock(this->mutex);
+}
+
+METHOD(kernel_interface_t, acquire, void,
+	private_kernel_interface_t *this, u_int32_t reqid,
+	traffic_selector_t *src_ts, traffic_selector_t *dst_ts)
+{
+	kernel_listener_t *listener;
+	enumerator_t *enumerator;
+	this->mutex->lock(this->mutex);
+	enumerator = this->listeners->create_enumerator(this->listeners);
+	while (enumerator->enumerate(enumerator, &listener))
+	{
+		if (listener->acquire &&
+			!listener->acquire(listener, reqid, src_ts, dst_ts))
+		{
+			this->listeners->remove_at(this->listeners, enumerator);
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->mutex->unlock(this->mutex);
+}
+
+METHOD(kernel_interface_t, expire, void,
+	private_kernel_interface_t *this, u_int8_t protocol, u_int32_t spi,
+	host_t *dst, bool hard)
+{
+	kernel_listener_t *listener;
+	enumerator_t *enumerator;
+
+	this->mutex->lock(this->mutex);
+	enumerator = this->listeners->create_enumerator(this->listeners);
+	while (enumerator->enumerate(enumerator, &listener))
+	{
+		if (listener->expire &&
+			!listener->expire(listener, protocol, spi, dst, hard))
+		{
+			this->listeners->remove_at(this->listeners, enumerator);
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->mutex->unlock(this->mutex);
+}
+
+METHOD(kernel_interface_t, mapping, void,
+	private_kernel_interface_t *this, u_int8_t protocol, u_int32_t spi,
+	host_t *dst, host_t *remote)
+{
+	kernel_listener_t *listener;
+	enumerator_t *enumerator;
+
+	this->mutex->lock(this->mutex);
+	enumerator = this->listeners->create_enumerator(this->listeners);
+	while (enumerator->enumerate(enumerator, &listener))
+	{
+		if (listener->mapping &&
+			!listener->mapping(listener, protocol, spi, dst, remote))
+		{
+			this->listeners->remove_at(this->listeners, enumerator);
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->mutex->unlock(this->mutex);
+}
+
+METHOD(kernel_interface_t, migrate, void,
+	private_kernel_interface_t *this, u_int32_t reqid,
+	traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
+	policy_dir_t direction, host_t *local, host_t *remote)
+{
+	kernel_listener_t *listener;
+	enumerator_t *enumerator;
+	this->mutex->lock(this->mutex);
+	enumerator = this->listeners->create_enumerator(this->listeners);
+	while (enumerator->enumerate(enumerator, &listener))
+	{
+		if (listener->migrate &&
+			!listener->migrate(listener, reqid, src_ts, dst_ts, direction,
+							   local, remote))
+		{
+			this->listeners->remove_at(this->listeners, enumerator);
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->mutex->unlock(this->mutex);
+}
+
+static bool call_roam(kernel_listener_t *listener, bool *roam)
+{
+	return listener->roam && !listener->roam(listener, *roam);
+}
+
+METHOD(kernel_interface_t, roam, void,
+	private_kernel_interface_t *this, bool address)
+{
+	this->mutex->lock(this->mutex);
+	this->listeners->remove(this->listeners, &address, (void*)call_roam);
+	this->mutex->unlock(this->mutex);
+}
+
+METHOD(kernel_interface_t, tun, void,
+	private_kernel_interface_t *this, tun_device_t *tun, bool created)
+{
+	kernel_listener_t *listener;
+	enumerator_t *enumerator;
+	this->mutex->lock(this->mutex);
+	enumerator = this->listeners->create_enumerator(this->listeners);
+	while (enumerator->enumerate(enumerator, &listener))
+	{
+		if (listener->tun &&
+			!listener->tun(listener, tun, created))
+		{
+			this->listeners->remove_at(this->listeners, enumerator);
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->mutex->unlock(this->mutex);
+}
+
+METHOD(kernel_interface_t, register_algorithm, void,
+	private_kernel_interface_t *this, u_int16_t alg_id, transform_type_t type,
+	u_int16_t kernel_id, char *kernel_name)
+{
+	kernel_algorithm_t *algorithm;
+
+	INIT(algorithm,
+		.type = type,
+		.ike = alg_id,
+		.kernel = kernel_id,
+		.name = strdup(kernel_name),
+	);
+
+	this->mutex_algs->lock(this->mutex_algs);
+	this->algorithms->insert_first(this->algorithms, algorithm);
+	this->mutex_algs->unlock(this->mutex_algs);
+}
+
+METHOD(kernel_interface_t, lookup_algorithm, bool,
+	private_kernel_interface_t *this, u_int16_t alg_id, transform_type_t type,
+	u_int16_t *kernel_id, char **kernel_name)
+{
+	kernel_algorithm_t *algorithm;
+	enumerator_t *enumerator;
+	bool found = FALSE;
+
+	this->mutex_algs->lock(this->mutex_algs);
+	enumerator = this->algorithms->create_enumerator(this->algorithms);
+	while (enumerator->enumerate(enumerator, &algorithm))
+	{
+		if (algorithm->type == type && algorithm->ike == alg_id)
+		{
+			if (kernel_id)
+			{
+				*kernel_id = algorithm->kernel;
+			}
+			if (kernel_name)
+			{
+				*kernel_name = algorithm->name;
+			}
+			found = TRUE;
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->mutex_algs->unlock(this->mutex_algs);
+	return found;
+}
+
+METHOD(kernel_interface_t, destroy, void,
+	private_kernel_interface_t *this)
+{
+	kernel_algorithm_t *algorithm;
+
+	while (this->algorithms->remove_first(this->algorithms,
+										 (void**)&algorithm) == SUCCESS)
+	{
+		free(algorithm->name);
+		free(algorithm);
+	}
+	this->algorithms->destroy(this->algorithms);
+	this->mutex_algs->destroy(this->mutex_algs);
+	DESTROY_IF(this->ipsec);
+	DESTROY_IF(this->net);
+	DESTROY_FUNCTION_IF(this->ifaces_filter, (void*)free);
+	this->reqids->destroy(this->reqids);
+	this->reqids_by_ts->destroy(this->reqids_by_ts);
+	this->listeners->destroy(this->listeners);
+	this->mutex->destroy(this->mutex);
+	free(this);
+}
+
+/*
+ * Described in header-file
+ */
+kernel_interface_t *kernel_interface_create()
+{
+	private_kernel_interface_t *this;
+	char *ifaces;
+
+	INIT(this,
+		.public = {
+			.get_features = _get_features,
+			.get_spi = _get_spi,
+			.get_cpi = _get_cpi,
+			.alloc_reqid = _alloc_reqid,
+			.release_reqid = _release_reqid,
+			.add_sa = _add_sa,
+			.update_sa = _update_sa,
+			.query_sa = _query_sa,
+			.del_sa = _del_sa,
+			.flush_sas = _flush_sas,
+			.add_policy = _add_policy,
+			.query_policy = _query_policy,
+			.del_policy = _del_policy,
+			.flush_policies = _flush_policies,
+			.get_source_addr = _get_source_addr,
+			.get_nexthop = _get_nexthop,
+			.get_interface = _get_interface,
+			.create_address_enumerator = _create_address_enumerator,
+			.add_ip = _add_ip,
+			.del_ip = _del_ip,
+			.add_route = _add_route,
+			.del_route = _del_route,
+			.bypass_socket = _bypass_socket,
+			.enable_udp_decap = _enable_udp_decap,
+
+			.is_interface_usable = _is_interface_usable,
+			.all_interfaces_usable = _all_interfaces_usable,
+			.get_address_by_ts = _get_address_by_ts,
+			.add_ipsec_interface = _add_ipsec_interface,
+			.remove_ipsec_interface = _remove_ipsec_interface,
+			.add_net_interface = _add_net_interface,
+			.remove_net_interface = _remove_net_interface,
+
+			.add_listener = _add_listener,
+			.remove_listener = _remove_listener,
+			.register_algorithm = _register_algorithm,
+			.lookup_algorithm = _lookup_algorithm,
+			.acquire = _acquire,
+			.expire = _expire,
+			.mapping = _mapping,
+			.migrate = _migrate,
+			.roam = _roam,
+			.tun = _tun,
+			.destroy = _destroy,
+		},
+		.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
+		.listeners = linked_list_create(),
+		.mutex_algs = mutex_create(MUTEX_TYPE_DEFAULT),
+		.algorithms = linked_list_create(),
+		.reqids = hashtable_create((hashtable_hash_t)hash_reqid,
+								   (hashtable_equals_t)equals_reqid, 8),
+		.reqids_by_ts = hashtable_create((hashtable_hash_t)hash_reqid_by_ts,
+								   (hashtable_equals_t)equals_reqid_by_ts, 8),
+	);
+
+	ifaces = lib->settings->get_str(lib->settings,
+									"%s.interfaces_use", NULL, lib->ns);
+	if (!ifaces)
+	{
+		this->ifaces_exclude = TRUE;
+		ifaces = lib->settings->get_str(lib->settings,
+									"%s.interfaces_ignore", NULL, lib->ns);
+	}
+	if (ifaces)
+	{
+		enumerator_t *enumerator;
+		char *iface;
+
+		enumerator = enumerator_create_token(ifaces, ",", " ");
+		while (enumerator->enumerate(enumerator, &iface))
+		{
+			if (!this->ifaces_filter)
+			{
+				this->ifaces_filter = linked_list_create();
+			}
+			this->ifaces_filter->insert_last(this->ifaces_filter,
+											 strdup(iface));
+		}
+		enumerator->destroy(enumerator);
+	}
+
+	return &this->public;
+}