1 files changed, 196 insertions, 0 deletions
diff --git a/src/libcharon/kernel/kernel_net.h b/src/libcharon/kernel/kernel_net.h
new file mode 100644
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+++ b/src/libcharon/kernel/kernel_net.h
@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2008-2012 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.
+ */
+
+/**
+ * @defgroup kernel_net kernel_net
+ * @{ @ingroup kernel
+ */
+
+#ifndef KERNEL_NET_H_
+#define KERNEL_NET_H_
+
+typedef struct kernel_net_t kernel_net_t;
+typedef enum kernel_address_type_t kernel_address_type_t;
+
+#include <collections/enumerator.h>
+#include <networking/host.h>
+#include <plugins/plugin.h>
+#include <kernel/kernel_interface.h>
+
+/**
+ * Type of addresses (e.g. when enumerating them)
+ */
+enum kernel_address_type_t {
+	/** normal addresses (on regular, up, non-ignored) interfaces */
+	ADDR_TYPE_REGULAR = (1 << 0),
+	/** addresses on down interfaces */
+	ADDR_TYPE_DOWN =  (1 << 1),
+	/** addresses on ignored interfaces */
+	ADDR_TYPE_IGNORED = (1 << 2),
+	/** addresses on loopback interfaces */
+	ADDR_TYPE_LOOPBACK = (1 << 3),
+	/** virtual IP addresses */
+	ADDR_TYPE_VIRTUAL = (1 << 4),
+	/** to enumerate all available addresses */
+	ADDR_TYPE_ALL = (1 << 5) - 1,
+};
+
+/**
+ * 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 the feature set supported by this kernel backend.
+	 *
+	 * @return				ORed feature-set of backend
+	 */
+	kernel_feature_t (*get_features)(kernel_net_t *this);
+
+	/**
+	 * 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 the 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.
+	 * An optional src address can be used to check if a route is available
+	 * for the given source to dest.
+	 *
+	 * @param dest			target destination address
+	 * @param prefix		prefix length if dest is a subnet, -1 for auto
+	 * @param src			source address to check, or NULL
+	 * @return				next hop address, NULL if unreachable
+	 */
+	host_t* (*get_nexthop)(kernel_net_t *this, host_t *dest, int prefix,
+						   host_t *src);
+
+	/**
+	 * Get the interface name of a local address. Interfaces that are down or
+	 * ignored by config are not considered.
+	 *
+	 * @param host			address to get interface name from
+	 * @param name			allocated interface name (optional)
+	 * @return				TRUE if interface found and usable
+	 */
+	bool (*get_interface) (kernel_net_t *this, host_t *host, char **name);
+
+	/**
+	 * 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 which			a combination of address types to enumerate
+	 * @return				enumerator over host_t's
+	 */
+	enumerator_t *(*create_address_enumerator) (kernel_net_t *this,
+												kernel_address_type_t which);
+
+	/**
+	 * 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().
+	 *
+	 * @param virtual_ip	virtual ip address to assign
+	 * @param prefix		prefix length to install with IP address, -1 for auto
+	 * @param iface			interface to install virtual IP on
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*add_ip) (kernel_net_t *this, host_t *virtual_ip, int prefix,
+						char *iface);
+
+	/**
+	 * Remove a virtual IP from an interface.
+	 *
+	 * The kernel interface uses refcounting, see add_ip().
+	 *
+	 * @param virtual_ip	virtual ip address to remove
+	 * @param prefix		prefix length of the IP to uninstall, -1 for auto
+	 * @param wait			TRUE to wait until IP is gone
+	 * @return				SUCCESS if operation completed
+	 */
+	status_t (*del_ip) (kernel_net_t *this, host_t *virtual_ip, int prefix,
+						bool wait);
+
+	/**
+	 * Add a route.
+	 *
+	 * @param dst_net		destination net
+	 * @param prefixlen		destination net prefix length
+	 * @param gateway		gateway for this route
+	 * @param src_ip		source 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		source 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);
+};
+
+/**
+ * Helper function to (un-)register net kernel interfaces from plugin features.
+ *
+ * This function is a plugin_feature_callback_t and can be used with the
+ * PLUGIN_CALLBACK macro to register an net kernel interface constructor.
+ *
+ * @param plugin		plugin registering the kernel interface
+ * @param feature		associated plugin feature
+ * @param reg			TRUE to register, FALSE to unregister
+ * @param data			data passed to callback, an kernel_net_constructor_t
+ */
+bool kernel_net_register(plugin_t *plugin, plugin_feature_t *feature,
+						 bool reg, void *data);
+
+#endif /** KERNEL_NET_H_ @}*/