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/*
* Copyright (C) 2008-2016 Tobias Brunner
* Copyright (C) 2007 Martin Willi
* HSR 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
* @param[out] iface allocated name of the interface to reach dest, if
* available (optional)
* @return next hop address, NULL if unreachable
*/
host_t* (*get_nexthop)(kernel_net_t *this, host_t *dest, int prefix,
host_t *src, char **iface);
/**
* 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,
uint8_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,
uint8_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_ @}*/
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