2005-12-05 13:43:43 +00:00
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/*
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2006-07-07 08:49:06 +00:00
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* Copyright (C) 2005-2006 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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2005-12-05 13:43:43 +00:00
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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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2006-04-10 08:07:38 +00:00
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#include <stddef.h>
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2005-12-05 13:43:43 +00:00
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2006-04-10 08:07:38 +00:00
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#include "delete_payload.h"
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2005-12-05 13:43:43 +00:00
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typedef struct private_delete_payload_t private_delete_payload_t;
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/**
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* Private data of an delete_payload_t object.
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*
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*/
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struct private_delete_payload_t {
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/**
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* Public delete_payload_t interface.
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*/
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delete_payload_t public;
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/**
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* Next payload type.
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*/
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u_int8_t next_payload;
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/**
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* Critical flag.
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*/
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bool critical;
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/**
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* Length of this payload.
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*/
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u_int16_t payload_length;
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/**
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* Protocol ID.
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*/
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u_int8_t protocol_id;
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/**
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* SPI Size.
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*/
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u_int8_t spi_size;
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/**
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* Number of SPI's.
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*/
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u_int16_t spi_count;
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/**
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* The contained SPI's.
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*/
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chunk_t spis;
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2006-06-09 15:12:43 +00:00
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/**
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* List containing u_int32_t spis
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*/
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linked_list_t *spi_list;
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2005-12-05 13:43:43 +00:00
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};
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/**
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* Encoding rules to parse or generate a DELETE payload
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*
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* The defined offsets are the positions in a object of type
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* private_delete_payload_t.
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*
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*/
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encoding_rule_t delete_payload_encodings[] = {
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/* 1 Byte next payload type, stored in the field next_payload */
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{ U_INT_8, offsetof(private_delete_payload_t, next_payload) },
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/* the critical bit */
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{ FLAG, offsetof(private_delete_payload_t, critical) },
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/* 7 Bit reserved bits, nowhere stored */
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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/* Length of the whole payload*/
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{ PAYLOAD_LENGTH, offsetof(private_delete_payload_t, payload_length)},
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{ U_INT_8, offsetof(private_delete_payload_t, protocol_id) },
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{ U_INT_8, offsetof(private_delete_payload_t, spi_size) },
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{ U_INT_16, offsetof(private_delete_payload_t, spi_count) },
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/* some delete data bytes, length is defined in PAYLOAD_LENGTH */
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{ SPIS, offsetof(private_delete_payload_t, spis) }
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};
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/*
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1 2 3
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! Next Payload !C! RESERVED ! Payload Length !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! Protocol ID ! SPI Size ! # of SPIs !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! !
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~ Security Parameter Index(es) (SPI) ~
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! !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/**
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* Implementation of payload_t.verify.
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*/
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static status_t verify(private_delete_payload_t *this)
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{
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2006-06-09 15:12:43 +00:00
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switch (this->protocol_id)
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2005-12-05 13:43:43 +00:00
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{
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2006-06-09 15:12:43 +00:00
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case PROTO_AH:
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case PROTO_ESP:
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if (this->spi_size != 4)
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{
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return FAILED;
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}
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break;
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case PROTO_IKE:
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case 0:
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/* IKE deletion has no spi assigned! */
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if (this->spi_size != 0)
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{
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return FAILED;
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}
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break;
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default:
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return FAILED;
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2005-12-05 13:43:43 +00:00
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}
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if (this->spis.len != (this->spi_count * this->spi_size))
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{
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return FAILED;
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}
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return SUCCESS;
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}
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/**
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* Implementation of delete_payload_t.get_encoding_rules.
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*/
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static void get_encoding_rules(private_delete_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
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{
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*rules = delete_payload_encodings;
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*rule_count = sizeof(delete_payload_encodings) / sizeof(encoding_rule_t);
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}
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/**
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* Implementation of payload_t.get_type.
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*/
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static payload_type_t get_payload_type(private_delete_payload_t *this)
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{
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return DELETE;
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}
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/**
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* Implementation of payload_t.get_next_type.
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*/
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static payload_type_t get_next_type(private_delete_payload_t *this)
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{
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return (this->next_payload);
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}
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/**
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* Implementation of payload_t.set_next_type.
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*/
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static void set_next_type(private_delete_payload_t *this,payload_type_t type)
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{
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this->next_payload = type;
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}
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/**
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* Implementation of payload_t.get_length.
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*/
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static size_t get_length(private_delete_payload_t *this)
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{
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return this->payload_length;
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}
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/**
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* Implementation of delete_payload_t.get_protocol_id.
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*/
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static protocol_id_t get_protocol_id (private_delete_payload_t *this)
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{
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return (this->protocol_id);
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}
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/**
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2006-06-09 15:12:43 +00:00
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* Implementation of delete_payload_t.add_spi.
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2005-12-05 13:43:43 +00:00
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*/
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2006-06-09 15:12:43 +00:00
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static void add_spi(private_delete_payload_t *this, u_int32_t spi)
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2005-12-05 13:43:43 +00:00
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{
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2006-06-09 15:12:43 +00:00
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/* only add SPIs if AH|ESP, ignore others */
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if (this->protocol_id == PROTO_AH || this->protocol_id == PROTO_ESP)
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2005-12-05 13:43:43 +00:00
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{
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2006-06-09 15:12:43 +00:00
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this->spi_count += 1;
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this->spis.len += this->spi_size;
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this->spis.ptr = realloc(this->spis.ptr, this->spis.len);
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*(u_int32_t*)(this->spis.ptr + (this->spis.len / this->spi_size - 1)) = spi;
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2007-03-19 08:04:37 +00:00
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if (this->spi_list)
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{
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/* reset SPI iterator list */
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this->spi_list->destroy(this->spi_list);
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this->spi_list = NULL;
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}
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2005-12-05 13:43:43 +00:00
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}
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2006-06-09 15:12:43 +00:00
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}
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/**
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* Implementation of delete_payload_t.create_spi_iterator.
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*/
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static iterator_t* create_spi_iterator(private_delete_payload_t *this)
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{
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int i;
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if (this->spi_list == NULL)
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{
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this->spi_list = linked_list_create();
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/* only parse SPIs if AH|ESP */
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if (this->protocol_id == PROTO_AH || this->protocol_id == PROTO_ESP)
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{
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for (i = 0; i < this->spi_count; i++)
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{
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2007-03-19 08:04:37 +00:00
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this->spi_list->insert_last(this->spi_list, this->spis.ptr + i *
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this->spi_size);
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2006-06-09 15:12:43 +00:00
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}
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}
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}
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return this->spi_list->create_iterator(this->spi_list, TRUE);
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2005-12-05 13:43:43 +00:00
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}
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/**
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* Implementation of payload_t.destroy and delete_payload_t.destroy.
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*/
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static void destroy(private_delete_payload_t *this)
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{
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if (this->spis.ptr != NULL)
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{
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2006-06-09 15:12:43 +00:00
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chunk_free(&this->spis);
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}
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if (this->spi_list)
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{
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this->spi_list->destroy(this->spi_list);
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2005-12-05 13:43:43 +00:00
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}
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2006-04-10 08:07:38 +00:00
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free(this);
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2005-12-05 13:43:43 +00:00
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}
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/*
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* Described in header
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*/
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2006-06-09 15:12:43 +00:00
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delete_payload_t *delete_payload_create(protocol_id_t protocol_id)
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2005-12-05 13:43:43 +00:00
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{
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2006-04-10 08:07:38 +00:00
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private_delete_payload_t *this = malloc_thing(private_delete_payload_t);
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2005-12-05 13:43:43 +00:00
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/* interface functions */
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this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
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this->public.payload_interface.get_encoding_rules = (void (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
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this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
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this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
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this->public.payload_interface.set_next_type = (void (*) (payload_t *,payload_type_t)) set_next_type;
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this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_payload_type;
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this->public.payload_interface.destroy = (void (*) (payload_t *))destroy;
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/* public functions */
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this->public.destroy = (void (*) (delete_payload_t *)) destroy;
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this->public.get_protocol_id = (protocol_id_t (*) (delete_payload_t *)) get_protocol_id;
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2006-06-09 15:12:43 +00:00
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this->public.add_spi = (void (*) (delete_payload_t *,u_int32_t))add_spi;
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this->public.create_spi_iterator = (iterator_t* (*) (delete_payload_t *)) create_spi_iterator;
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2005-12-05 13:43:43 +00:00
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/* private variables */
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this->critical = FALSE;
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this->next_payload = NO_PAYLOAD;
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2006-06-09 15:12:43 +00:00
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this->payload_length = DELETE_PAYLOAD_HEADER_LENGTH;
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this->protocol_id = protocol_id;
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this->spi_size = protocol_id == PROTO_AH || protocol_id == PROTO_ESP ? 4 : 0;
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2005-12-05 13:43:43 +00:00
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this->spi_count = 0;
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2006-10-31 12:27:59 +00:00
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this->spis = chunk_empty;
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2006-06-09 15:12:43 +00:00
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this->spi_list = NULL;
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2005-12-05 13:43:43 +00:00
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2006-06-09 15:12:43 +00:00
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return (&this->public);
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2005-12-05 13:43:43 +00:00
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}
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