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