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/*
* Copyright (C) 2005-2010 Martin Willi
* Copyright (C) 2010 revosec AG
* Copyright (C) 2005 Jan Hutter
* HSR 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.
*/
#include "traffic_selector_substructure.h"
#include <encoding/payloads/encodings.h>
#include <collections/linked_list.h>
typedef struct private_traffic_selector_substructure_t private_traffic_selector_substructure_t;
/**
* Private data of an traffic_selector_substructure_t object.
*/
struct private_traffic_selector_substructure_t {
/**
* Public traffic_selector_substructure_t interface.
*/
traffic_selector_substructure_t public;
/**
* Type of traffic selector.
*/
uint8_t ts_type;
/**
* IP Protocol ID.
*/
uint8_t ip_protocol_id;
/**
* Length of this payload.
*/
uint16_t payload_length;
/**
* Start port number.
*/
uint16_t start_port;
/**
* End port number.
*/
uint16_t end_port;
/**
* Starting address.
*/
chunk_t starting_address;
/**
* Ending address.
*/
chunk_t ending_address;
};
/**
* Encoding rules to parse or generate a TS payload
*
* The defined offsets are the positions in a object of type
* private_traffic_selector_substructure_t.
*/
static encoding_rule_t encodings[] = {
/* 1 Byte next ts type*/
{ TS_TYPE, offsetof(private_traffic_selector_substructure_t, ts_type) },
/* 1 Byte IP protocol id*/
{ U_INT_8, offsetof(private_traffic_selector_substructure_t, ip_protocol_id) },
/* Length of the whole payload*/
{ PAYLOAD_LENGTH,offsetof(private_traffic_selector_substructure_t, payload_length) },
/* 2 Byte start port*/
{ U_INT_16, offsetof(private_traffic_selector_substructure_t, start_port) },
/* 2 Byte end port*/
{ U_INT_16, offsetof(private_traffic_selector_substructure_t, end_port) },
/* starting address is either 4 or 16 byte */
{ ADDRESS, offsetof(private_traffic_selector_substructure_t, starting_address) },
/* ending address is either 4 or 16 byte */
{ ADDRESS, offsetof(private_traffic_selector_substructure_t, ending_address) }
};
/*
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! TS Type !IP Protocol ID*| Selector Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Start Port* | End Port* |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! !
~ Starting Address* ~
! !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! !
~ Ending Address* ~
! !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
METHOD(payload_t, verify, status_t,
private_traffic_selector_substructure_t *this)
{
if (this->start_port > this->end_port)
{
/* OPAQUE ports are the only exception */
if (this->start_port != 0xffff && this->end_port != 0)
{
return FAILED;
}
}
switch (this->ts_type)
{
case TS_IPV4_ADDR_RANGE:
{
if ((this->starting_address.len != 4) ||
(this->ending_address.len != 4))
{
/* ipv4 address must be 4 bytes long */
return FAILED;
}
break;
}
case TS_IPV6_ADDR_RANGE:
{
if ((this->starting_address.len != 16) ||
(this->ending_address.len != 16))
{
/* ipv6 address must be 16 bytes long */
return FAILED;
}
break;
}
default:
{
/* not supported ts type */
return FAILED;
}
}
return SUCCESS;
}
METHOD(payload_t, get_encoding_rules, int,
private_traffic_selector_substructure_t *this, encoding_rule_t **rules)
{
*rules = encodings;
return countof(encodings);
}
METHOD(payload_t, get_header_length, int,
private_traffic_selector_substructure_t *this)
{
return 8;
}
METHOD(payload_t, get_type, payload_type_t,
private_traffic_selector_substructure_t *this)
{
return PLV2_TRAFFIC_SELECTOR_SUBSTRUCTURE;
}
METHOD(payload_t, get_next_type, payload_type_t,
private_traffic_selector_substructure_t *this)
{
return PL_NONE;
}
METHOD(payload_t, set_next_type, void,
private_traffic_selector_substructure_t *this,payload_type_t type)
{
}
METHOD(payload_t, get_length, size_t,
private_traffic_selector_substructure_t *this)
{
return this->payload_length;
}
METHOD(traffic_selector_substructure_t, get_traffic_selector, traffic_selector_t*,
private_traffic_selector_substructure_t *this)
{
return traffic_selector_create_from_bytes(
this->ip_protocol_id, this->ts_type,
this->starting_address, this->start_port,
this->ending_address, this->end_port);
}
METHOD2(payload_t, traffic_selector_substructure_t, destroy, void,
private_traffic_selector_substructure_t *this)
{
free(this->starting_address.ptr);
free(this->ending_address.ptr);
free(this);
}
/*
* Described in header
*/
traffic_selector_substructure_t *traffic_selector_substructure_create()
{
private_traffic_selector_substructure_t *this;
INIT(this,
.public = {
.payload_interface = {
.verify = _verify,
.get_encoding_rules = _get_encoding_rules,
.get_header_length = _get_header_length,
.get_length = _get_length,
.get_next_type = _get_next_type,
.set_next_type = _set_next_type,
.get_type = _get_type,
.destroy = _destroy,
},
.get_traffic_selector = _get_traffic_selector,
.destroy = _destroy,
},
.payload_length = get_header_length(this),
/* must be set to be valid */
.ts_type = TS_IPV4_ADDR_RANGE,
);
return &this->public;
}
/*
* Described in header
*/
traffic_selector_substructure_t *traffic_selector_substructure_create_from_traffic_selector(
traffic_selector_t *ts)
{
private_traffic_selector_substructure_t *this;
this = (private_traffic_selector_substructure_t*)traffic_selector_substructure_create();
this->ts_type = ts->get_type(ts);
this->ip_protocol_id = ts->get_protocol(ts);
this->start_port = ts->get_from_port(ts);
this->end_port = ts->get_to_port(ts);
this->starting_address = chunk_clone(ts->get_from_address(ts));
this->ending_address = chunk_clone(ts->get_to_address(ts));
this->payload_length = get_header_length(this) +
this->ending_address.len + this->starting_address.len;
return &this->public;
}
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