161 lines
4.7 KiB
C
161 lines
4.7 KiB
C
/**
|
|
* @file child_sa.h
|
|
*
|
|
* @brief Interface of child_sa_t.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2005 Martin Willi
|
|
* 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 CHILD_SA_H_
|
|
#define CHILD_SA_H_
|
|
|
|
#include <types.h>
|
|
#include <crypto/prf_plus.h>
|
|
#include <encoding/payloads/proposal_substructure.h>
|
|
#include <utils/logger.h>
|
|
|
|
typedef struct child_sa_t child_sa_t;
|
|
|
|
/**
|
|
* @brief Represents multiple IPsec SAs between two hosts.
|
|
*
|
|
* A child_sa_t contains multiple SAs. SAs for both
|
|
* directions are managed in one child_sa_t object, and
|
|
* if both AH and ESP is set up, both protocols are managed
|
|
* by one child_sa_t. This means we can have two or
|
|
* in the AH+ESP case four IPsec-SAs in one child_sa_t.
|
|
*
|
|
* The procedure for child sa setup is as follows:
|
|
* - A gets SPIs for a proposal via child_sa_t.alloc
|
|
* - A send the updated proposal to B
|
|
* - B selects a suitable proposal
|
|
* - B calls child_sa_t.add to add and update the selected proposal
|
|
* - B sends the updated proposal to A
|
|
* - A calls child_sa_t.update to update the already allocated SPIs with the chosen proposal
|
|
*
|
|
* Once SAs are set up, policies can be added using add_policies.
|
|
*
|
|
*
|
|
* @b Constructors:
|
|
* - child_sa_create()
|
|
*
|
|
* @ingroup sa
|
|
*/
|
|
struct child_sa_t {
|
|
|
|
/**
|
|
* @brief Get the unique reqid of the CHILD SA.
|
|
*
|
|
* Every CHILD_SA has a unique reqid, which is also
|
|
* stored down in the kernel.
|
|
*
|
|
* @param this calling object
|
|
* @return reqid of the CHILD SA
|
|
*/
|
|
u_int32_t (*get_reqid)(child_sa_t *this);
|
|
|
|
/**
|
|
* @brief Allocate SPIs for a given proposals.
|
|
*
|
|
* Since the kernel manages SPIs for us, we need
|
|
* to allocate them. If the proposal contains more
|
|
* than one protocol, for each protocol an SPI is
|
|
* allocated. SPIs are stored internally and written
|
|
* back to the proposal.
|
|
*
|
|
* @param this calling object
|
|
* @param proposal proposal for which SPIs are allocated
|
|
*/
|
|
status_t (*alloc)(child_sa_t *this, linked_list_t* proposals);
|
|
|
|
/**
|
|
* @brief Install the kernel SAs for a proposal.
|
|
*
|
|
* Since the kernel manages SPIs for us, we need
|
|
* to allocate them. If the proposal contains more
|
|
* than one protocol, for each protocol an SPI is
|
|
* allocated. SPIs are stored internally and written
|
|
* back to the proposal.
|
|
*
|
|
* @param this calling object
|
|
* @param proposal proposal for which SPIs are allocated
|
|
* @param prf_plus key material to use for key derivation
|
|
*/
|
|
status_t (*add)(child_sa_t *this, proposal_t *proposal, prf_plus_t *prf_plus);
|
|
|
|
/**
|
|
* @brief Install the kernel SAs for a proposal, if SPIs already allocated.
|
|
*
|
|
* This one updates the SAs in the kernel, which are
|
|
* allocated via alloc, with a selected proposals.
|
|
*
|
|
* @param this calling object
|
|
* @param proposal proposal for which SPIs are allocated
|
|
* @param prf_plus key material to use for key derivation
|
|
*/
|
|
status_t (*update)(child_sa_t *this, proposal_t *proposal, prf_plus_t *prf_plus);
|
|
|
|
/**
|
|
* @brief Install the policies using some traffic selectors.
|
|
*
|
|
* Supplied lists of traffic_selector_t's specify the policies
|
|
* to use for this child sa.
|
|
*
|
|
* @param this calling object
|
|
* @param my_ts traffic selectors for local site
|
|
* @param other_ts traffic selectors for remote site
|
|
* @return SUCCESS or FAILED
|
|
*/
|
|
status_t (*add_policies) (child_sa_t *this, linked_list_t *my_ts_list, linked_list_t *other_ts_list);
|
|
|
|
/**
|
|
* @brief Log the status of a child_sa to a logger.
|
|
*
|
|
* The status of ESP/AH SAs is logged with the supplied logger in
|
|
* a human readable form.
|
|
* Supplying NULL as logger uses the internal child_sa logger
|
|
* to do the logging. The name is only a log-prefix without further
|
|
* meaning.
|
|
*
|
|
* @param this calling object
|
|
* @param logger logger to use for logging
|
|
* @param name connection name
|
|
*/
|
|
void (*log_status) (child_sa_t *this, logger_t *logger, char *name);
|
|
|
|
/**
|
|
* @brief Destroys a child_sa.
|
|
*
|
|
* @param this calling object
|
|
*/
|
|
void (*destroy) (child_sa_t *this);
|
|
};
|
|
|
|
/**
|
|
* @brief Constructor to create a new child_sa_t.
|
|
*
|
|
* @param me own address
|
|
* @param other remote address
|
|
* @return child_sa_t object
|
|
*
|
|
* @ingroup sa
|
|
*/
|
|
child_sa_t * child_sa_create(host_t *me, host_t *other);
|
|
|
|
#endif /*CHILD_SA_H_*/
|