277 lines
8.3 KiB
C
277 lines
8.3 KiB
C
/*
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* Copyright (C) 2005-2006 Martin Willi
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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 <utils/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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*/
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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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u_int8_t ts_type;
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/**
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* IP Protocol ID.
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*/
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u_int8_t ip_protocol_id;
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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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* Start port number.
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*/
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u_int16_t start_port;
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/**
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* End port number.
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*/
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u_int16_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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*/
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encoding_rule_t traffic_selector_substructure_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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/**
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* Implementation of payload_t.verify.
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*/
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static status_t verify(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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return FAILED;
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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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/**
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* Implementation of traffic_selector_substructure_t.get_encoding_rules.
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*/
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static void get_encoding_rules(private_traffic_selector_substructure_t *this, encoding_rule_t **rules, size_t *rule_count)
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{
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*rules = traffic_selector_substructure_encodings;
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*rule_count = sizeof(traffic_selector_substructure_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_traffic_selector_substructure_t *this)
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{
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return TRAFFIC_SELECTOR_SUBSTRUCTURE;
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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_traffic_selector_substructure_t *this)
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{
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return 0;
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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_traffic_selector_substructure_t *this,payload_type_t type)
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{
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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_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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/**
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* Implementation of traffic_selector_substructure_t.get_traffic_selector.
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*/
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static traffic_selector_t *get_traffic_selector(private_traffic_selector_substructure_t *this)
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{
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traffic_selector_t *ts;
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ts = traffic_selector_create_from_bytes(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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return ts;
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}
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/**
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* recompute length field of the payload
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*/
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void compute_length(private_traffic_selector_substructure_t *this)
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{
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this->payload_length = TRAFFIC_SELECTOR_HEADER_LENGTH +
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this->ending_address.len + this->starting_address.len;
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}
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/**
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* Implementation of payload_t.destroy and traffic_selector_substructure_t.destroy.
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*/
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static void destroy(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 = malloc_thing(private_traffic_selector_substructure_t);
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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.get_traffic_selector = (traffic_selector_t* (*)(traffic_selector_substructure_t*))get_traffic_selector;
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this->public.destroy = (void (*) (traffic_selector_substructure_t *)) destroy;
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/* private variables */
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this->payload_length = TRAFFIC_SELECTOR_HEADER_LENGTH;
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this->start_port = 0;
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this->end_port = 0;
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this->starting_address = chunk_empty;
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this->ending_address = chunk_empty;
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this->ip_protocol_id = 0;
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/* must be set to be valid */
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this->ts_type = TS_IPV4_ADDR_RANGE;
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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(traffic_selector_t *traffic_selector)
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{
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private_traffic_selector_substructure_t *this = (private_traffic_selector_substructure_t*)traffic_selector_substructure_create();
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this->ts_type = traffic_selector->get_type(traffic_selector);
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this->ip_protocol_id = traffic_selector->get_protocol(traffic_selector);
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this->start_port = traffic_selector->get_from_port(traffic_selector);
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this->end_port = traffic_selector->get_to_port(traffic_selector);
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this->starting_address = chunk_clone(traffic_selector->get_from_address(traffic_selector));
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this->ending_address = chunk_clone(traffic_selector->get_to_address(traffic_selector));
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compute_length(this);
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return &(this->public);
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}
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