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acddc0ed | 1 | // SPDX-License-Identifier: LGPL-2.1-or-later |
74971473 JG |
2 | /* |
3 | * This file is part of the PCEPlib, a PCEP protocol library. | |
4 | * | |
5 | * Copyright (C) 2020 Volta Networks https://voltanet.io/ | |
6 | * | |
74971473 JG |
7 | * Author : Brady Johnson <brady@voltanet.io> |
8 | * | |
9 | */ | |
10 | ||
11 | ||
12 | /* | |
13 | * Definitions for encoding and decoding PCEP messages, objects, and TLVs. | |
14 | */ | |
15 | ||
16 | #ifndef PCEP_ENCODING_H | |
17 | #define PCEP_ENCODING_H | |
18 | ||
19 | #include <stdbool.h> | |
20 | ||
21 | #include "pcep_msg_messages.h" | |
22 | #include "pcep_msg_objects.h" | |
23 | #include "pcep_msg_tlvs.h" | |
24 | ||
25 | #ifdef __cplusplus | |
26 | extern "C" { | |
27 | #endif | |
28 | ||
29 | struct pcep_versioning { | |
30 | bool draft_ietf_pce_segment_routing_07; /* If false, use draft16 */ | |
31 | /* As more draft versions are incorporated, add appropriate attributes | |
32 | */ | |
33 | }; | |
34 | ||
35 | #define MESSAGE_HEADER_LENGTH 4 | |
36 | #define PCEP_MESSAGE_LENGTH 65535 | |
37 | #define OBJECT_HEADER_LENGTH 4 | |
38 | #define OBJECT_RO_SUBOBJ_HEADER_LENGTH 2 | |
39 | #define TLV_HEADER_LENGTH 4 | |
40 | #define LENGTH_1WORD sizeof(uint32_t) | |
41 | #define LENGTH_2WORDS sizeof(uint32_t) * 2 | |
42 | #define LENGTH_3WORDS sizeof(uint32_t) * 3 | |
43 | #define LENGTH_4WORDS sizeof(uint32_t) * 4 | |
44 | #define LENGTH_5WORDS sizeof(uint32_t) * 5 | |
45 | #define LENGTH_6WORDS sizeof(uint32_t) * 6 | |
46 | #define LENGTH_7WORDS sizeof(uint32_t) * 7 | |
47 | #define LENGTH_8WORDS sizeof(uint32_t) * 8 | |
48 | #define LENGTH_9WORDS sizeof(uint32_t) * 9 | |
49 | #define LENGTH_10WORDS sizeof(uint32_t) * 10 | |
50 | #define LENGTH_11WORDS sizeof(uint32_t) * 11 | |
51 | #define LENGTH_12WORDS sizeof(uint32_t) * 12 | |
52 | #define LENGTH_13WORDS sizeof(uint32_t) * 13 | |
53 | ||
54 | /* When iterating sub-objects or TLVs, limit to 10 in case corrupt data is | |
55 | * received */ | |
56 | #define MAX_ITERATIONS 10 | |
57 | ||
58 | struct pcep_versioning *create_default_pcep_versioning(void); | |
59 | void destroy_pcep_versioning(struct pcep_versioning *versioning); | |
60 | ||
61 | /* | |
62 | * Message encoding / decoding functions | |
63 | */ | |
64 | ||
65 | /* Called before sending messages to encode the message to a byte buffer in | |
66 | * Network byte order. This function will also encode all the objects and their | |
67 | * TLVs in the message. The result will be stored in the encoded_message field | |
68 | * in the pcep_message. Implemented in pcep-messages-encoding.c */ | |
69 | void pcep_encode_message(struct pcep_message *message, | |
70 | struct pcep_versioning *versioning); | |
71 | ||
72 | /* Decode the message header and return the message length. | |
73 | * Returns < 0 for invalid message headers. */ | |
74 | int32_t pcep_decode_validate_msg_header(const uint8_t *msg_buf); | |
75 | ||
76 | /* Decode the entire message */ | |
77 | struct pcep_message *pcep_decode_message(const uint8_t *message_buffer); | |
78 | ||
79 | ||
80 | /* | |
81 | * Object encoding / decoding functions | |
82 | */ | |
83 | ||
84 | /* Implemented in pcep-objects-encoding.c | |
85 | * Encode the object in struct pcep_object_header* into the uint8_t *buf, | |
86 | * and return the encoded object_length. */ | |
87 | uint16_t pcep_encode_object(struct pcep_object_header *object_hdr, | |
88 | struct pcep_versioning *versioning, uint8_t *buf); | |
89 | ||
90 | /* Implemented in pcep-objects-encoding.c | |
91 | * Decode the object, including the TLVs (if any) and return the object. | |
92 | * Returns object on success, NULL otherwise. */ | |
93 | struct pcep_object_header *pcep_decode_object(const uint8_t *msg_buf); | |
94 | ||
95 | /* Internal util functions implemented in pcep-objects-encoding.c */ | |
96 | void encode_ipv6(struct in6_addr *src_ipv6, uint32_t *dst); | |
97 | void decode_ipv6(const uint32_t *src, struct in6_addr *dst_ipv6); | |
98 | uint16_t normalize_pcep_tlv_length(uint16_t length); | |
99 | bool pcep_object_has_tlvs(struct pcep_object_header *object_hdr); | |
100 | uint16_t pcep_object_get_length_by_hdr(struct pcep_object_header *object_hdr); | |
101 | uint16_t pcep_object_get_length(enum pcep_object_classes object_class, | |
102 | enum pcep_object_types object_type); | |
103 | ||
104 | ||
105 | /* | |
106 | * TLV encoding / decoding functions | |
107 | */ | |
108 | ||
109 | /* Implemented in pcep-tlv-encoding.c | |
110 | * Encode the tlv in struct pcep_tlv_header* into the uint8_t *buf, | |
111 | * and return the encoded tlv_length. */ | |
112 | uint16_t pcep_encode_tlv(struct pcep_object_tlv_header *tlv_hdr, | |
113 | struct pcep_versioning *versioning, uint8_t *buf); | |
114 | ||
115 | /* Decode the TLV in tlv_buf and return a pointer to the object */ | |
116 | struct pcep_object_tlv_header *pcep_decode_tlv(const uint8_t *tlv_buf); | |
117 | ||
118 | ||
119 | /* | |
120 | * utils mainly for testing purposes | |
121 | */ | |
122 | bool validate_message_objects(struct pcep_message *msg); | |
123 | ||
124 | #ifdef __cplusplus | |
125 | } | |
126 | #endif | |
127 | ||
128 | #endif |