256 lines
8.2 KiB
C
256 lines
8.2 KiB
C
/**
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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 Jan Hutter, Martin Willi
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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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#include <linux/xfrm.h>
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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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typedef struct natt_conf_t natt_conf_t;
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/**
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* @brief Configuration for NAT-T
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*/
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struct natt_conf_t {
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u_int16_t sport, dport;
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};
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typedef struct kernel_interface_t kernel_interface_t;
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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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*
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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,
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host_t *src, host_t *dst,
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protocol_id_t protocol,
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u_int32_t reqid,
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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
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* @param natt NAT-T Configuration
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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,
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u_int32_t spi,
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protocol_id_t protocol,
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u_int32_t reqid,
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u_int64_t expire_soft,
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u_int64_t expire_hard,
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algorithm_t *enc_alg,
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algorithm_t *int_alg,
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prf_plus_t *prf_plus,
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natt_conf_t *natt,
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bool replace);
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/**
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* @brief Update the hosts on an installed SA. Encapsulation ports are also updated.
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*
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* @note We cannot directly update the destination address as the kernel requires the spi,
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* the protocol AND the destination address (and family) to identify SAs. Therefore if the
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* destination address changed we 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 src source address for this SA
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* @param dst destination address for this SA
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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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* @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 (*update_sa_hosts)(kernel_interface_t *this,
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host_t *src, host_t *dst,
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host_t *new_src, host_t *new_dst,
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int src_changes, int dst_changes,
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u_int32_t spi, protocol_id_t protocol);
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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,
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host_t *dst,
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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, so
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* traffic applied to a policy. Traffic which
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* matches a policy is handled by the SA with the same
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* reqid.
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*
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* @param this calling object
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* @param me address of local peer
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* @param other address of remote peer
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* @param src src address of traffic this policy applies
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* @param dst dest address of traffic this policy applies
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* @param src_hostbits subnetmask to use for src address
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* @param dst_hostbits subnetmask to use for dst address
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* @param direction direction of traffic, XFRM_POLICY_OUT, XFRM_POLICY_IN, XFRM_POLICY_FWD
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* @param upper_proto upper layer protocol of traffic for this policy (TCP, UDP, ICMP, ...)
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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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* @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 *me, host_t *other,
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host_t *src, host_t *dst,
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u_int8_t src_hostbits, u_int8_t dst_hostbits,
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int direction, int upper_proto,
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protocol_id_t protocol,
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u_int32_t reqid);
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/**
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* @brief Query the use time of a policy
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*
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* @param this calling object
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* @param me address of local peer
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* @param other address of remote peer
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* @param src src address of traffic this policy applies
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* @param dst dest address of traffic this policy applies
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* @param src_hostbits subnetmask to use for src address
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* @param dst_hostbits subnetmask to use for dst address
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* @param direction direction of traffic, XFRM_POLICY_OUT, XFRM_POLICY_IN, XFRM_POLICY_FWD
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* @param upper_proto upper layer protocol of traffic for this policy (TCP, UDP, ICMP, ...)
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* @param use_time the time of this policy'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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host_t *me, host_t *other,
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host_t *src, host_t *dst,
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u_int8_t src_hostbits, u_int8_t dst_hostbits,
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int direction, int upper_proto,
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time_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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* @param this calling object
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* @param me address of local peer
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* @param other address of remote peer
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* @param src src address of traffic this policy applies
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* @param dst dest address of traffic this policy applies
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* @param src_hostbits subnetmask to use for src address
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* @param dst_hostbits subnetmask to use for dst address
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* @param direction direction of traffic, XFRM_POLICY_OUT, XFRM_POLICY_IN, XFRM_POLICY_FWD
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* @param upper_proto upper layer protocol of traffic for this policy (TCP, UDP, ICMP, ...)
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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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host_t *me, host_t *other,
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host_t *src, host_t *dst,
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u_int8_t src_hostbits, u_int8_t dst_hostbits,
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int direction, int upper_proto);
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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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