134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
/**
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* @file child_sa.h
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*
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* @brief Interface of child_sa_t.
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*
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*/
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/*
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* Copyright (C) 2005 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 CHILD_SA_H_
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#define CHILD_SA_H_
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#include <types.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 child_sa_t child_sa_t;
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/**
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* @brief Represents multiple IPsec SAs between two hosts.
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*
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* A child_sa_t contains multiple SAs. SAs for both
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* directions are managed in one child_sa_t object, and
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* if both AH and ESP is set up, both protocols are managed
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* by one child_sa_t. This means we can have two or
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* in the AH+ESP case four IPsec-SAs in one child_sa_t.
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*
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* The procedure for child sa setup is as follows:
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* - A gets SPIs for a proposal via child_sa_t.alloc
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* - A send the updated proposal to B
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* - B selects a suitable proposal
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* - B calls child_sa_t.add to add and update the selected proposal
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* - B sends the updated proposal to A
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* - A calls child_sa_t.update to update the already allocated SPIs with the chosen proposal
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*
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* Once SAs are set up, policies can be added using add_policies.
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*
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*
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* @b Constructors:
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* - child_sa_create()
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*
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* @ingroup sa
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*/
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struct child_sa_t {
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/**
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* @brief Allocate SPIs for a given proposals.
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*
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* Since the kernel manages SPIs for us, we need
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* to allocate them. If the proposal contains more
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* than one protocol, for each protocol an SPI is
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* allocated. SPIs are stored internally and written
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* back to the proposal.
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*
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* @param this calling object
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* @param proposal proposal for which SPIs are allocated
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*/
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status_t (*alloc)(child_sa_t *this, linked_list_t* proposals);
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/**
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* @brief Install the kernel SAs for a proposal.
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*
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* Since the kernel manages SPIs for us, we need
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* to allocate them. If the proposal contains more
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* than one protocol, for each protocol an SPI is
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* allocated. SPIs are stored internally and written
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* back to the proposal.
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*
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* @param this calling object
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* @param proposal proposal for which SPIs are allocated
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* @param prf_plus key material to use for key derivation
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*/
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status_t (*add)(child_sa_t *this, proposal_t *proposal, prf_plus_t *prf_plus);
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/**
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* @brief Install the kernel SAs for a proposal, if SPIs already allocated.
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*
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* This one updates the SAs in the kernel, which are
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* allocated via alloc, with a selected proposals.
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*
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* @param this calling object
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* @param proposal proposal for which SPIs are allocated
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* @param prf_plus key material to use for key derivation
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*/
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status_t (*update)(child_sa_t *this, proposal_t *proposal, prf_plus_t *prf_plus);
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/**
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* @brief Install the policies using some traffic selectors.
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*
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* Spplied lists of traffic_selector_t's specify the policies
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* to use for this child sa.
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*
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* @param this calling object
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* @param my_ts traffic selectors for local site
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* @param other_ts traffic selectors for remote site
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* @return SUCCESS or FAILED
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*/
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status_t (*add_policies) (child_sa_t *this, linked_list_t *my_ts_list, linked_list_t *other_ts_list);
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/**
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* @brief Destroys a child_sa.
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*
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* @param this calling object
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*/
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void (*destroy) (child_sa_t *this);
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};
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/**
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* @brief Constructor to create a new child_sa_t.
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*
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* @param me own address
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* @param other remote address
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* @return child_sa_t object
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*
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* @ingroup sa
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*/
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child_sa_t * child_sa_create(host_t *me, host_t *other);
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#endif /*CHILD_SA_H_*/
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