restructured file layout
new configuration structure: peer_cfg: configuration related to a peer (authenitcation, ...= ike_cfg: config to use for IKE setup (proposals) child_Cfg: config for CHILD_SA (proposals, traffic selectors) a peer_cfg has one ike_cfg and multiple child_cfg's stroke now uses fixed count of threads
This commit is contained in:
Martin Willi
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/**
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* @file kernel_interface.h
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*
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* @brief Interface of kernel_interface_t.
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*
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*/
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/*
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* Copyright (C) 2006 Tobias Brunner, Daniel Roethlisberger
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* Copyright (C) 2005-2006 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#ifndef KERNEL_INTERFACE_H_
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#define KERNEL_INTERFACE_H_
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typedef struct natt_conf_t natt_conf_t;
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typedef enum policy_dir_t policy_dir_t;
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typedef struct kernel_interface_t kernel_interface_t;
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#include <utils/host.h>
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#include <crypto/prf_plus.h>
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#include <encoding/payloads/proposal_substructure.h>
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/**
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* Configuration for NAT-T
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*/
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struct natt_conf_t {
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/** source port to use for UDP-encapsulated packets */
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u_int16_t sport;
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/** dest port to use for UDP-encapsulated packets */
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u_int16_t dport;
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};
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/**
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* Direction of a policy. These are equal to those
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* defined in xfrm.h, but we want to stay implementation
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* neutral here.
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*/
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enum policy_dir_t {
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/** Policy for inbound traffic */
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POLICY_IN = 0,
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/** Policy for outbound traffic */
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POLICY_OUT = 1,
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/** Policy for forwarded traffic */
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POLICY_FWD = 2,
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};
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/**
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* @brief Interface to the kernel.
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*
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* The kernel interface handles the communication with the kernel
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* for SA and policy management. It allows setup of these, and provides
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* further the handling of kernel events.
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* Policy information are cached in the interface. This is necessary to do
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* reference counting. The Linux kernel does not allow the same policy
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* installed twice, but we need this as CHILD_SA exist multiple times
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* when rekeying. Thats why we do reference counting of policies.
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*
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* @b Constructors:
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* - kernel_interface_create()
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*
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* @ingroup threads
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*/
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struct kernel_interface_t {
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/**
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* @brief Get a SPI from the kernel.
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*
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* @warning get_spi() implicitely creates an SA with
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* the allocated SPI, therefore the replace flag
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* in add_sa() must be set when installing this SA.
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*
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* @param this calling object
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* @param src source address of SA
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* @param dst destination address of SA
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* @param protocol protocol for SA (ESP/AH)
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* @param reqid unique ID for this SA
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* @param[out] spi allocated spi
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* @return
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* - SUCCESS
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* - FAILED if kernel comm failed
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*/
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status_t (*get_spi)(kernel_interface_t *this, host_t *src, host_t *dst,
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protocol_id_t protocol, u_int32_t reqid, u_int32_t *spi);
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/**
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* @brief Add an SA to the SAD.
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*
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* add_sa() may update an already allocated
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* SPI (via get_spi). In this case, the replace
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* flag must be set.
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* This function does install a single SA for a
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* single protocol in one direction. The kernel-interface
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* gets the keys itself from the PRF, as we don't know
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* his algorithms and key sizes.
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*
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* @param this calling object
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* @param src source address for this SA
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* @param dst destination address for this SA
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* @param spi SPI allocated by us or remote peer
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* @param protocol protocol for this SA (ESP/AH)
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* @param reqid unique ID for this SA
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* @param expire_soft lifetime in seconds before rekeying
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* @param expire_hard lieftime in seconds before delete
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* @param enc_alg Algorithm to use for encryption (ESP only)
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* @param int_alg Algorithm to use for integrity protection
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* @param prf_plus PRF to derive keys from
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* @param natt NAT-T Configuration, or NULL of no NAT-T used
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* @param mode mode of the SA (tunnel, transport)
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* @param replace Should an already installed SA be updated?
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* @return
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* - SUCCESS
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* - FAILED if kernel comm failed
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*/
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status_t (*add_sa) (kernel_interface_t *this,
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host_t *src, host_t *dst, u_int32_t spi,
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protocol_id_t protocol, u_int32_t reqid,
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u_int64_t expire_soft, u_int64_t expire_hard,
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algorithm_t *enc_alg, algorithm_t *int_alg,
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prf_plus_t *prf_plus, natt_conf_t *natt,
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mode_t mode, bool update);
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/**
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* @brief Update the hosts on an installed SA.
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*
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* We cannot directly update the destination address as the kernel
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* requires the spi, the protocol AND the destination address (and family)
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* to identify SAs. Therefore if the destination address changed we
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* create a new SA and delete the old one.
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*
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* @param this calling object
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* @param dst destination address for this SA
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* @param spi SPI of the SA
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* @param protocol protocol for this SA (ESP/AH)
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* @param new_src new source address for this SA
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* @param new_dst new destination address for this SA
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* @param src_changes changes in src
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* @param dst_changes changes in dst
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* @return
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* - SUCCESS
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* - FAILED if kernel comm failed
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*/
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status_t (*update_sa)(kernel_interface_t *this, host_t *dst, u_int32_t spi,
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protocol_id_t protocol,
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host_t *new_src, host_t *new_dst,
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host_diff_t src_changes, host_diff_t dst_changes);
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/**
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* @brief Query the use time of an SA.
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*
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* The use time of an SA is not the time of the last usage, but
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* the time of the first usage of the SA.
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*
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* @param this calling object
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* @param dst destination address for this SA
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* @param spi SPI allocated by us or remote peer
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* @param protocol protocol for this SA (ESP/AH)
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* @param[out] use_time the time of this SA's last use
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* @return
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* - SUCCESS
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* - FAILED if kernel comm failed
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*/
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status_t (*query_sa) (kernel_interface_t *this, host_t *dst, u_int32_t spi,
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protocol_id_t protocol, u_int32_t *use_time);
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/**
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* @brief Delete a previusly installed SA from the SAD.
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*
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* @param this calling object
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* @param dst destination address for this SA
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* @param spi SPI allocated by us or remote peer
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* @param protocol protocol for this SA (ESP/AH)
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* @return
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* - SUCCESS
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* - FAILED if kernel comm failed
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*/
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status_t (*del_sa) (kernel_interface_t *this, host_t *dst, u_int32_t spi,
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protocol_id_t protocol);
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/**
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* @brief Add a policy to the SPD.
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*
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* A policy is always associated to an SA. Traffic which matches a
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* policy is handled by the SA with the same reqid.
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* If the update flag is set, the policy is updated with the new
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* src/dst addresses.
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* If the update flag is not set, but a such policy is already in the
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* kernel, the reference count to this policy is increased.
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*
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* @param this calling object
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* @param src source address of SA
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* @param dst dest address of SA
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* @param src_ts traffic selector to match traffic source
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* @param dst_ts traffic selector to match traffic dest
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* @param direction direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
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* @param protocol protocol to use to protect traffic (AH/ESP)
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* @param reqid uniqe ID of an SA to use to enforce policy
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* @param high_prio if TRUE, uses a higher priority than any with FALSE
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* @param mode mode of SA (tunnel, transport)
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* @param update update an existing policy, if TRUE
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* @return
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* - SUCCESS
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* - FAILED if kernel comm failed
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*/
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status_t (*add_policy) (kernel_interface_t *this,
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host_t *src, host_t *dst,
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traffic_selector_t *src_ts,
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traffic_selector_t *dst_ts,
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policy_dir_t direction, protocol_id_t protocol,
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u_int32_t reqid, bool high_prio,
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mode_t mode, bool update);
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/**
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* @brief Query the use time of a policy.
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*
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* The use time of a policy is the time the policy was used
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* for the last time.
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*
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* @param this calling object
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* @param src_ts traffic selector to match traffic source
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* @param dst_ts traffic selector to match traffic dest
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* @param direction direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
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* @param[out] use_time the time of this SA's last use
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* @return
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* - SUCCESS
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* - FAILED if kernel comm failed
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*/
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status_t (*query_policy) (kernel_interface_t *this,
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traffic_selector_t *src_ts,
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traffic_selector_t *dst_ts,
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policy_dir_t direction, u_int32_t *use_time);
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/**
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* @brief Remove a policy from the SPD.
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*
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* The kernel interface implements reference counting for policies.
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* If the same policy is installed multiple times (in the case of rekeying),
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* the reference counter is increased. del_policy() decreases the ref counter
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* and removes the policy only when no more references are available.
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*
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* @param this calling object
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* @param src_ts traffic selector to match traffic source
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* @param dst_ts traffic selector to match traffic dest
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* @param direction direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
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* @return
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* - SUCCESS
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* - FAILED if kernel comm failed
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*/
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status_t (*del_policy) (kernel_interface_t *this,
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traffic_selector_t *src_ts,
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traffic_selector_t *dst_ts,
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policy_dir_t direction);
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/**
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* @brief Get the interface name of a local address.
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*
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* @param this calling object
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* @param host address to get interface name from
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* @return allocated interface name, or NULL if not found
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*/
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char* (*get_interface) (kernel_interface_t *this, host_t *host);
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/**
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* @brief Creates a list of all local addresses.
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*
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* @param this calling object
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* @return allocated list with host_t objects
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*/
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linked_list_t *(*create_address_list) (kernel_interface_t *this);
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/**
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* @brief Add a virtual IP to an interface.
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*
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* Virtual IPs are attached to an interface. If an IP is added multiple
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* times, the IP is refcounted and not removed until del_ip() was called
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* as many times as add_ip().
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* The virtual IP is attached to the interface where the iface_ip is found.
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*
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* @param this calling object
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* @param virtual_ip virtual ip address to assign
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* @param iface_ip IP of an interface to attach virtual IP
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* @return
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* - SUCCESS
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* - FAILED if kernel comm failed
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*/
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status_t (*add_ip) (kernel_interface_t *this, host_t *virtual_ip,
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host_t *iface_ip);
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/**
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* @brief Remove a virtual IP from an interface.
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*
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* The kernel interface uses refcounting, see add_ip().
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*
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* @param this calling object
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* @param virtual_ip virtual ip address to assign
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* @param iface_ip IP of an interface to remove virtual IP from
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* @return
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* - SUCCESS
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* - FAILED if kernel comm failed
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*/
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status_t (*del_ip) (kernel_interface_t *this, host_t *virtual_ip,
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host_t *iface_ip);
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/**
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* @brief Destroys a kernel_interface object.
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*
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* @param kernel_interface_t calling object
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*/
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void (*destroy) (kernel_interface_t *kernel_interface);
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};
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/**
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* @brief Creates an object of type kernel_interface_t.
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*
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* @ingroup threads
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*/
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kernel_interface_t *kernel_interface_create(void);
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#endif /*KERNEL_INTERFACE_H_*/
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