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1 | // SPDX-License-Identifier: MIT | |
2 | /* nhrp_protocol.h - NHRP protocol definitions | |
3 | * | |
4 | * Copyright (c) 2007-2012 Timo Teräs <timo.teras@iki.fi> | |
5 | */ | |
6 | ||
7 | #ifndef NHRP_PROTOCOL_H | |
8 | #define NHRP_PROTOCOL_H | |
9 | ||
10 | #include <stdint.h> | |
11 | ||
12 | /* NHRP Ethernet protocol number */ | |
13 | #define ETH_P_NHRP 0x2001 | |
14 | ||
15 | /* NHRP Version */ | |
16 | #define NHRP_VERSION_RFC2332 1 | |
17 | ||
18 | /* NHRP Packet Types */ | |
19 | #define NHRP_PACKET_RESOLUTION_REQUEST 1 | |
20 | #define NHRP_PACKET_RESOLUTION_REPLY 2 | |
21 | #define NHRP_PACKET_REGISTRATION_REQUEST 3 | |
22 | #define NHRP_PACKET_REGISTRATION_REPLY 4 | |
23 | #define NHRP_PACKET_PURGE_REQUEST 5 | |
24 | #define NHRP_PACKET_PURGE_REPLY 6 | |
25 | #define NHRP_PACKET_ERROR_INDICATION 7 | |
26 | #define NHRP_PACKET_TRAFFIC_INDICATION 8 | |
27 | #define NHRP_PACKET_MAX 8 | |
28 | ||
29 | /* NHRP Extension Types */ | |
30 | #define NHRP_EXTENSION_FLAG_COMPULSORY 0x8000 | |
31 | #define NHRP_EXTENSION_END 0 | |
32 | #define NHRP_EXTENSION_PAYLOAD 0 | |
33 | #define NHRP_EXTENSION_RESPONDER_ADDRESS 3 | |
34 | #define NHRP_EXTENSION_FORWARD_TRANSIT_NHS 4 | |
35 | #define NHRP_EXTENSION_REVERSE_TRANSIT_NHS 5 | |
36 | #define NHRP_EXTENSION_AUTHENTICATION 7 | |
37 | #define NHRP_EXTENSION_VENDOR 8 | |
38 | #define NHRP_EXTENSION_NAT_ADDRESS 9 | |
39 | ||
40 | /* NHRP Error Indication Codes */ | |
41 | #define NHRP_ERROR_UNRECOGNIZED_EXTENSION 1 | |
42 | #define NHRP_ERROR_LOOP_DETECTED 2 | |
43 | #define NHRP_ERROR_PROTOCOL_ADDRESS_UNREACHABLE 6 | |
44 | #define NHRP_ERROR_PROTOCOL_ERROR 7 | |
45 | #define NHRP_ERROR_SDU_SIZE_EXCEEDED 8 | |
46 | #define NHRP_ERROR_INVALID_EXTENSION 9 | |
47 | #define NHRP_ERROR_INVALID_RESOLUTION_REPLY 10 | |
48 | #define NHRP_ERROR_AUTHENTICATION_FAILURE 11 | |
49 | #define NHRP_ERROR_HOP_COUNT_EXCEEDED 15 | |
50 | ||
51 | /* NHRP CIE Codes */ | |
52 | #define NHRP_CODE_SUCCESS 0 | |
53 | #define NHRP_CODE_ADMINISTRATIVELY_PROHIBITED 4 | |
54 | #define NHRP_CODE_INSUFFICIENT_RESOURCES 5 | |
55 | #define NHRP_CODE_NO_BINDING_EXISTS 11 | |
56 | #define NHRP_CODE_BINDING_NON_UNIQUE 13 | |
57 | #define NHRP_CODE_UNIQUE_ADDRESS_REGISTERED 14 | |
58 | ||
59 | /* NHRP Flags for Resolution request/reply */ | |
60 | #define NHRP_FLAG_RESOLUTION_SOURCE_IS_ROUTER 0x8000 | |
61 | #define NHRP_FLAG_RESOLUTION_AUTHORATIVE 0x4000 | |
62 | #define NHRP_FLAG_RESOLUTION_DESTINATION_STABLE 0x2000 | |
63 | #define NHRP_FLAG_RESOLUTION_UNIQUE 0x1000 | |
64 | #define NHRP_FLAG_RESOLUTION_SOURCE_STABLE 0x0800 | |
65 | #define NHRP_FLAG_RESOLUTION_NAT 0x0002 | |
66 | ||
67 | /* NHRP Flags for Registration request/reply */ | |
68 | #define NHRP_FLAG_REGISTRATION_UNIQUE 0x8000 | |
69 | #define NHRP_FLAG_REGISTRATION_NAT 0x0002 | |
70 | ||
71 | /* NHRP Flags for Purge request/reply */ | |
72 | #define NHRP_FLAG_PURGE_NO_REPLY 0x8000 | |
73 | ||
74 | /* NHRP Authentication extension types (ala Cisco) */ | |
75 | #define NHRP_AUTHENTICATION_PLAINTEXT 0x00000001 | |
76 | ||
77 | /* NHRP Packet Structures */ | |
78 | struct nhrp_packet_header { | |
79 | /* Fixed header */ | |
80 | uint16_t afnum; | |
81 | uint16_t protocol_type; | |
82 | uint8_t snap[5]; | |
83 | uint8_t hop_count; | |
84 | uint16_t packet_size; | |
85 | uint16_t checksum; | |
86 | uint16_t extension_offset; | |
87 | uint8_t version; | |
88 | uint8_t type; | |
89 | uint8_t src_nbma_address_len; | |
90 | uint8_t src_nbma_subaddress_len; | |
91 | ||
92 | /* Mandatory header */ | |
93 | uint8_t src_protocol_address_len; | |
94 | uint8_t dst_protocol_address_len; | |
95 | uint16_t flags; | |
96 | union { | |
97 | uint32_t request_id; | |
98 | struct { | |
99 | uint16_t code; | |
100 | uint16_t offset; | |
101 | } error; | |
102 | } u; | |
103 | } __attribute__((packed)); | |
104 | ||
105 | struct nhrp_cie_header { | |
106 | uint8_t code; | |
107 | uint8_t prefix_length; | |
108 | uint16_t unused; | |
109 | uint16_t mtu; | |
110 | uint16_t holding_time; | |
111 | uint8_t nbma_address_len; | |
112 | uint8_t nbma_subaddress_len; | |
113 | uint8_t protocol_address_len; | |
114 | uint8_t preference; | |
115 | } __attribute__((packed)); | |
116 | ||
117 | struct nhrp_extension_header { | |
118 | uint16_t type; | |
119 | uint16_t length; | |
120 | } __attribute__((packed)); | |
121 | ||
122 | struct nhrp_cisco_authentication_extension { | |
123 | uint32_t type; | |
124 | uint8_t secret[8]; | |
125 | } __attribute__((packed)); | |
126 | ||
127 | #endif |