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authorRene Mayrhofer <rene@mayrhofer.eu.org>2007-06-03 17:36:35 +0000
committerRene Mayrhofer <rene@mayrhofer.eu.org>2007-06-03 17:36:35 +0000
commit08ee5250bd9c43fda5f24d10b791ca2c4c17fcee (patch)
treed4e2fc7144e288d624555a38955593e1ee066531 /src/charon/threads/kernel_interface.h
parentb0d8ed94fe9e74afb49fdf5f11e4add29879c65c (diff)
downloadvyos-strongswan-08ee5250bd9c43fda5f24d10b791ca2c4c17fcee.tar.gz
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[svn-upgrade] Integrating new upstream version, strongswan (4.1.3)
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-/**
- * @file kernel_interface.h
- *
- * @brief Interface of kernel_interface_t.
- *
- */
-
-/*
- * Copyright (C) 2006 Tobias Brunner, 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.
- */
-
-#ifndef KERNEL_INTERFACE_H_
-#define KERNEL_INTERFACE_H_
-
-typedef struct natt_conf_t natt_conf_t;
-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>
-
-/**
- * Configuration for NAT-T
- */
-struct natt_conf_t {
- /** source port to use for UDP-encapsulated packets */
- u_int16_t sport;
- /** dest port to use for UDP-encapsulated packets */
- u_int16_t dport;
-};
-
-/**
- * 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,
-};
-
-/**
- * @brief Interface to the kernel.
- *
- * 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.
- *
- * @b Constructors:
- * - kernel_interface_create()
- *
- * @ingroup threads
- */
-struct kernel_interface_t {
-
- /**
- * @brief Get a SPI from the kernel.
- *
- * @warning get_spi() implicitely creates an SA with
- * the allocated SPI, therefore the replace flag
- * in add_sa() must be set when installing this SA.
- *
- * @param this calling object
- * @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[out] spi allocated spi
- * @return
- * - SUCCESS
- * - FAILED if kernel comm failed
- */
- status_t (*get_spi)(kernel_interface_t *this, host_t *src, host_t *dst,
- protocol_id_t protocol, u_int32_t reqid, u_int32_t *spi);
-
- /**
- * @brief 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 this calling object
- * @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 lieftime in seconds before delete
- * @param enc_alg Algorithm to use for encryption (ESP only)
- * @param int_alg Algorithm to use for integrity protection
- * @param prf_plus PRF to derive keys from
- * @param natt NAT-T Configuration, or NULL of no NAT-T used
- * @param mode mode of the SA (tunnel, transport)
- * @param replace Should an already installed SA be updated?
- * @return
- * - SUCCESS
- * - FAILED if kernel comm failed
- */
- status_t (*add_sa) (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,
- algorithm_t *enc_alg, algorithm_t *int_alg,
- prf_plus_t *prf_plus, natt_conf_t *natt,
- mode_t mode, bool update);
-
- /**
- * @brief 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 this calling object
- * @param dst destination address for this SA
- * @param spi SPI of the SA
- * @param protocol protocol for this SA (ESP/AH)
- * @param new_src new source address for this SA
- * @param new_dst new destination address for this SA
- * @param src_changes changes in src
- * @param dst_changes changes in dst
- * @return
- * - SUCCESS
- * - FAILED if kernel comm failed
- */
- status_t (*update_sa)(kernel_interface_t *this, host_t *dst, u_int32_t spi,
- protocol_id_t protocol,
- host_t *new_src, host_t *new_dst,
- host_diff_t src_changes, host_diff_t dst_changes);
-
- /**
- * @brief 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 this calling object
- * @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[out] use_time the time of this SA's last use
- * @return
- * - SUCCESS
- * - FAILED if kernel comm failed
- */
- status_t (*query_sa) (kernel_interface_t *this, host_t *dst, u_int32_t spi,
- protocol_id_t protocol, u_int32_t *use_time);
-
- /**
- * @brief Delete a previusly installed SA from the SAD.
- *
- * @param this calling object
- * @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
- * - FAILED if kernel comm failed
- */
- status_t (*del_sa) (kernel_interface_t *this, host_t *dst, u_int32_t spi,
- protocol_id_t protocol);
-
- /**
- * @brief 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.
- * If the update flag is set, the policy is updated with the new
- * src/dst addresses.
- * If the update flag is not set, but a such policy is already in the
- * kernel, the reference count to this policy is increased.
- *
- * @param this calling object
- * @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 uniqe 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 update update an existing policy, if TRUE
- * @return
- * - SUCCESS
- * - FAILED if kernel comm failed
- */
- status_t (*add_policy) (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, bool update);
-
- /**
- * @brief 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 this calling object
- * @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
- * - FAILED if kernel comm failed
- */
- status_t (*query_policy) (kernel_interface_t *this,
- traffic_selector_t *src_ts,
- traffic_selector_t *dst_ts,
- policy_dir_t direction, u_int32_t *use_time);
-
- /**
- * @brief 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 this calling object
- * @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
- * - FAILED if kernel comm failed
- */
- status_t (*del_policy) (kernel_interface_t *this,
- traffic_selector_t *src_ts,
- traffic_selector_t *dst_ts,
- policy_dir_t direction);
-
- /**
- * @brief Get the interface name of a local address.
- *
- * @param this calling object
- * @param host address to get interface name from
- * @return allocated interface name, or NULL if not found
- */
- char* (*get_interface) (kernel_interface_t *this, host_t *host);
-
- /**
- * @brief Creates a list of all local addresses.
- *
- * @param this calling object
- * @return allocated list with host_t objects
- */
- linked_list_t *(*create_address_list) (kernel_interface_t *this);
-
- /**
- * @brief 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 this calling object
- * @param virtual_ip virtual ip address to assign
- * @param iface_ip IP of an interface to attach virtual IP
- * @return
- * - SUCCESS
- * - FAILED if kernel comm failed
- */
- status_t (*add_ip) (kernel_interface_t *this, host_t *virtual_ip,
- host_t *iface_ip);
-
- /**
- * @brief Remove a virtual IP from an interface.
- *
- * The kernel interface uses refcounting, see add_ip().
- *
- * @param this calling object
- * @param virtual_ip virtual ip address to assign
- * @param iface_ip IP of an interface to remove virtual IP from
- * @return
- * - SUCCESS
- * - FAILED if kernel comm failed
- */
- status_t (*del_ip) (kernel_interface_t *this, host_t *virtual_ip,
- host_t *iface_ip);
-
- /**
- * @brief Destroys a kernel_interface object.
- *
- * @param kernel_interface_t calling object
- */
- void (*destroy) (kernel_interface_t *kernel_interface);
-};
-
-/**
- * @brief Creates an object of type kernel_interface_t.
- *
- * @ingroup threads
- */
-kernel_interface_t *kernel_interface_create(void);
-
-#endif /*KERNEL_INTERFACE_H_*/