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pcep_msg_encoding.h
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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* This file is part of the PCEPlib, a PCEP protocol library.
*
* Copyright (C) 2020 Volta Networks https://voltanet.io/
*
* Author : Brady Johnson <brady@voltanet.io>
*
*/
/*
* Definitions for encoding and decoding PCEP messages, objects, and TLVs.
*/
#ifndef PCEP_ENCODING_H
#define PCEP_ENCODING_H
#include <stdbool.h>
#include "pcep_msg_messages.h"
#include "pcep_msg_objects.h"
#include "pcep_msg_tlvs.h"
#ifdef __cplusplus
extern "C" {
#endif
struct pcep_versioning {
bool draft_ietf_pce_segment_routing_07; /* If false, use draft16 */
/* As more draft versions are incorporated, add appropriate attributes
*/
};
#define MESSAGE_HEADER_LENGTH 4
#define PCEP_MESSAGE_LENGTH 65535
#define OBJECT_HEADER_LENGTH 4
#define OBJECT_RO_SUBOBJ_HEADER_LENGTH 2
#define TLV_HEADER_LENGTH 4
#define LENGTH_1WORD sizeof(uint32_t)
#define LENGTH_2WORDS sizeof(uint32_t) * 2
#define LENGTH_3WORDS sizeof(uint32_t) * 3
#define LENGTH_4WORDS sizeof(uint32_t) * 4
#define LENGTH_5WORDS sizeof(uint32_t) * 5
#define LENGTH_6WORDS sizeof(uint32_t) * 6
#define LENGTH_7WORDS sizeof(uint32_t) * 7
#define LENGTH_8WORDS sizeof(uint32_t) * 8
#define LENGTH_9WORDS sizeof(uint32_t) * 9
#define LENGTH_10WORDS sizeof(uint32_t) * 10
#define LENGTH_11WORDS sizeof(uint32_t) * 11
#define LENGTH_12WORDS sizeof(uint32_t) * 12
#define LENGTH_13WORDS sizeof(uint32_t) * 13
/* When iterating sub-objects or TLVs, limit to 10 in case corrupt data is
* received */
#define MAX_ITERATIONS 10
struct pcep_versioning *create_default_pcep_versioning(void);
void destroy_pcep_versioning(struct pcep_versioning *versioning);
/*
* Message encoding / decoding functions
*/
/* Called before sending messages to encode the message to a byte buffer in
* Network byte order. This function will also encode all the objects and their
* TLVs in the message. The result will be stored in the encoded_message field
* in the pcep_message. Implemented in pcep-messages-encoding.c */
void pcep_encode_message(struct pcep_message *message,
struct pcep_versioning *versioning);
/* Decode the message header and return the message length.
* Returns < 0 for invalid message headers. */
int32_t pcep_decode_validate_msg_header(const uint8_t *msg_buf);
/* Decode the entire message */
struct pcep_message *pcep_decode_message(const uint8_t *message_buffer);
/*
* Object encoding / decoding functions
*/
/* Implemented in pcep-objects-encoding.c
* Encode the object in struct pcep_object_header* into the uint8_t *buf,
* and return the encoded object_length. */
uint16_t pcep_encode_object(struct pcep_object_header *object_hdr,
struct pcep_versioning *versioning, uint8_t *buf);
/* Implemented in pcep-objects-encoding.c
* Decode the object, including the TLVs (if any) and return the object.
* Returns object on success, NULL otherwise. */
struct pcep_object_header *pcep_decode_object(const uint8_t *msg_buf);
/* Internal util functions implemented in pcep-objects-encoding.c */
void encode_ipv6(struct in6_addr *src_ipv6, uint32_t *dst);
void decode_ipv6(const uint32_t *src, struct in6_addr *dst_ipv6);
uint16_t normalize_pcep_tlv_length(uint16_t length);
bool pcep_object_has_tlvs(struct pcep_object_header *object_hdr);
uint16_t pcep_object_get_length_by_hdr(struct pcep_object_header *object_hdr);
uint16_t pcep_object_get_length(enum pcep_object_classes object_class,
enum pcep_object_types object_type);
/*
* TLV encoding / decoding functions
*/
/* Implemented in pcep-tlv-encoding.c
* Encode the tlv in struct pcep_tlv_header* into the uint8_t *buf,
* and return the encoded tlv_length. */
uint16_t pcep_encode_tlv(struct pcep_object_tlv_header *tlv_hdr,
struct pcep_versioning *versioning, uint8_t *buf);
/* Decode the TLV in tlv_buf and return a pointer to the object */
struct pcep_object_tlv_header *pcep_decode_tlv(const uint8_t *tlv_buf);
/*
* utils mainly for testing purposes
*/
bool validate_message_objects(struct pcep_message *msg);
#ifdef __cplusplus
}
#endif
#endif