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/*
* 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.
*
* $Id: delete_payload.c 3589 2008-03-13 14:14:44Z martin $
*/
#include <stddef.h>
#include "delete_payload.h"
typedef struct private_delete_payload_t private_delete_payload_t;
/**
* Private data of an delete_payload_t object.
*
*/
struct private_delete_payload_t {
/**
* Public delete_payload_t interface.
*/
delete_payload_t public;
/**
* Next payload type.
*/
u_int8_t next_payload;
/**
* Critical flag.
*/
bool critical;
/**
* Length of this payload.
*/
u_int16_t payload_length;
/**
* Protocol ID.
*/
u_int8_t protocol_id;
/**
* SPI Size.
*/
u_int8_t spi_size;
/**
* Number of SPI's.
*/
u_int16_t spi_count;
/**
* The contained SPI's.
*/
chunk_t spis;
/**
* List containing u_int32_t spis
*/
linked_list_t *spi_list;
};
/**
* Encoding rules to parse or generate a DELETE payload
*
* The defined offsets are the positions in a object of type
* private_delete_payload_t.
*
*/
encoding_rule_t delete_payload_encodings[] = {
/* 1 Byte next payload type, stored in the field next_payload */
{ U_INT_8, offsetof(private_delete_payload_t, next_payload) },
/* the critical bit */
{ FLAG, offsetof(private_delete_payload_t, critical) },
/* 7 Bit reserved bits, nowhere stored */
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
/* Length of the whole payload*/
{ PAYLOAD_LENGTH, offsetof(private_delete_payload_t, payload_length)},
{ U_INT_8, offsetof(private_delete_payload_t, protocol_id) },
{ U_INT_8, offsetof(private_delete_payload_t, spi_size) },
{ U_INT_16, offsetof(private_delete_payload_t, spi_count) },
/* some delete data bytes, length is defined in PAYLOAD_LENGTH */
{ SPIS, offsetof(private_delete_payload_t, spis) }
};
/*
1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! Next Payload !C! RESERVED ! Payload Length !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! Protocol ID ! SPI Size ! # of SPIs !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! !
~ Security Parameter Index(es) (SPI) ~
! !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/**
* Implementation of payload_t.verify.
*/
static status_t verify(private_delete_payload_t *this)
{
switch (this->protocol_id)
{
case PROTO_AH:
case PROTO_ESP:
if (this->spi_size != 4)
{
return FAILED;
}
break;
case PROTO_IKE:
case 0:
/* IKE deletion has no spi assigned! */
if (this->spi_size != 0)
{
return FAILED;
}
break;
default:
return FAILED;
}
if (this->spis.len != (this->spi_count * this->spi_size))
{
return FAILED;
}
return SUCCESS;
}
/**
* Implementation of delete_payload_t.get_encoding_rules.
*/
static void get_encoding_rules(private_delete_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
{
*rules = delete_payload_encodings;
*rule_count = sizeof(delete_payload_encodings) / sizeof(encoding_rule_t);
}
/**
* Implementation of payload_t.get_type.
*/
static payload_type_t get_payload_type(private_delete_payload_t *this)
{
return DELETE;
}
/**
* Implementation of payload_t.get_next_type.
*/
static payload_type_t get_next_type(private_delete_payload_t *this)
{
return (this->next_payload);
}
/**
* Implementation of payload_t.set_next_type.
*/
static void set_next_type(private_delete_payload_t *this,payload_type_t type)
{
this->next_payload = type;
}
/**
* Implementation of payload_t.get_length.
*/
static size_t get_length(private_delete_payload_t *this)
{
return this->payload_length;
}
/**
* Implementation of delete_payload_t.get_protocol_id.
*/
static protocol_id_t get_protocol_id (private_delete_payload_t *this)
{
return (this->protocol_id);
}
/**
* Implementation of delete_payload_t.add_spi.
*/
static void add_spi(private_delete_payload_t *this, u_int32_t spi)
{
/* only add SPIs if AH|ESP, ignore others */
if (this->protocol_id == PROTO_AH || this->protocol_id == PROTO_ESP)
{
this->spi_count += 1;
this->spis.len += this->spi_size;
this->spis.ptr = realloc(this->spis.ptr, this->spis.len);
*(u_int32_t*)(this->spis.ptr + (this->spis.len / this->spi_size - 1)) = spi;
if (this->spi_list)
{
/* reset SPI iterator list */
this->spi_list->destroy(this->spi_list);
this->spi_list = NULL;
}
}
}
/**
* Implementation of delete_payload_t.create_spi_iterator.
*/
static iterator_t* create_spi_iterator(private_delete_payload_t *this)
{
int i;
if (this->spi_list == NULL)
{
this->spi_list = linked_list_create();
/* only parse SPIs if AH|ESP */
if (this->protocol_id == PROTO_AH || this->protocol_id == PROTO_ESP)
{
for (i = 0; i < this->spi_count; i++)
{
this->spi_list->insert_last(this->spi_list, this->spis.ptr + i *
this->spi_size);
}
}
}
return this->spi_list->create_iterator(this->spi_list, TRUE);
}
/**
* Implementation of payload_t.destroy and delete_payload_t.destroy.
*/
static void destroy(private_delete_payload_t *this)
{
if (this->spis.ptr != NULL)
{
chunk_free(&this->spis);
}
if (this->spi_list)
{
this->spi_list->destroy(this->spi_list);
}
free(this);
}
/*
* Described in header
*/
delete_payload_t *delete_payload_create(protocol_id_t protocol_id)
{
private_delete_payload_t *this = malloc_thing(private_delete_payload_t);
/* interface functions */
this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
this->public.payload_interface.get_encoding_rules = (void (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
this->public.payload_interface.set_next_type = (void (*) (payload_t *,payload_type_t)) set_next_type;
this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_payload_type;
this->public.payload_interface.destroy = (void (*) (payload_t *))destroy;
/* public functions */
this->public.destroy = (void (*) (delete_payload_t *)) destroy;
this->public.get_protocol_id = (protocol_id_t (*) (delete_payload_t *)) get_protocol_id;
this->public.add_spi = (void (*) (delete_payload_t *,u_int32_t))add_spi;
this->public.create_spi_iterator = (iterator_t* (*) (delete_payload_t *)) create_spi_iterator;
/* private variables */
this->critical = FALSE;
this->next_payload = NO_PAYLOAD;
this->payload_length = DELETE_PAYLOAD_HEADER_LENGTH;
this->protocol_id = protocol_id;
this->spi_size = protocol_id == PROTO_AH || protocol_id == PROTO_ESP ? 4 : 0;
this->spi_count = 0;
this->spis = chunk_empty;
this->spi_list = NULL;
return (&this->public);
}
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