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gerrit.opencord.org / quagga / e2a8979f8fa5d08896d2c6af9c74c0859c12cab2 / . / nhrpd / nhrp_protocol.h
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Timo Teräsdafa05e2017-01-19 17:27:01 +0200[diff] [blame]1/* nhrp_protocol.h - NHRP protocol definitions
2 *
3 * Copyright (c) 2007-2012 Timo Teräs <timo.teras@iki.fi>
4 *
5 * This software is licensed under the MIT License.
6 * See MIT-LICENSE.txt for additional details.
7 */
8
9#ifndef NHRP_PROTOCOL_H
10#define NHRP_PROTOCOL_H
11
12#include <stdint.h>
13
14/* NHRP Ethernet protocol number */
15#define ETH_P_NHRP 0x2001
16
17/* NHRP Version */
18#define NHRP_VERSION_RFC2332 1
19
20/* NHRP Packet Types */
21#define NHRP_PACKET_RESOLUTION_REQUEST 1
22#define NHRP_PACKET_RESOLUTION_REPLY 2
23#define NHRP_PACKET_REGISTRATION_REQUEST 3
24#define NHRP_PACKET_REGISTRATION_REPLY 4
25#define NHRP_PACKET_PURGE_REQUEST 5
26#define NHRP_PACKET_PURGE_REPLY 6
27#define NHRP_PACKET_ERROR_INDICATION 7
28#define NHRP_PACKET_TRAFFIC_INDICATION 8
29
30/* NHRP Extension Types */
31#define NHRP_EXTENSION_FLAG_COMPULSORY 0x8000
32#define NHRP_EXTENSION_END 0
33#define NHRP_EXTENSION_PAYLOAD 0
34#define NHRP_EXTENSION_RESPONDER_ADDRESS 3
35#define NHRP_EXTENSION_FORWARD_TRANSIT_NHS 4
36#define NHRP_EXTENSION_REVERSE_TRANSIT_NHS 5
37#define NHRP_EXTENSION_AUTHENTICATION 7
38#define NHRP_EXTENSION_VENDOR 8
39#define NHRP_EXTENSION_NAT_ADDRESS 9
40
41/* NHRP Error Indication Codes */
42#define NHRP_ERROR_UNRECOGNIZED_EXTENSION 1
43#define NHRP_ERROR_LOOP_DETECTED 2
44#define NHRP_ERROR_PROTOCOL_ADDRESS_UNREACHABLE 6
45#define NHRP_ERROR_PROTOCOL_ERROR 7
46#define NHRP_ERROR_SDU_SIZE_EXCEEDED 8
47#define NHRP_ERROR_INVALID_EXTENSION 9
48#define NHRP_ERROR_INVALID_RESOLUTION_REPLY 10
49#define NHRP_ERROR_AUTHENTICATION_FAILURE 11
50#define NHRP_ERROR_HOP_COUNT_EXCEEDED 15
51
52/* NHRP CIE Codes */
53#define NHRP_CODE_SUCCESS 0
54#define NHRP_CODE_ADMINISTRATIVELY_PROHIBITED 4
55#define NHRP_CODE_INSUFFICIENT_RESOURCES 5
56#define NHRP_CODE_NO_BINDING_EXISTS 11
57#define NHRP_CODE_BINDING_NON_UNIQUE 13
58#define NHRP_CODE_UNIQUE_ADDRESS_REGISTERED 14
59
60/* NHRP Flags for Resolution request/reply */
61#define NHRP_FLAG_RESOLUTION_SOURCE_IS_ROUTER 0x8000
62#define NHRP_FLAG_RESOLUTION_AUTHORATIVE 0x4000
63#define NHRP_FLAG_RESOLUTION_DESTINATION_STABLE 0x2000
64#define NHRP_FLAG_RESOLUTION_UNIQUE 0x1000
65#define NHRP_FLAG_RESOLUTION_SOURCE_STABLE 0x0800
66#define NHRP_FLAG_RESOLUTION_NAT 0x0002
67
68/* NHRP Flags for Registration request/reply */
69#define NHRP_FLAG_REGISTRATION_UNIQUE 0x8000
70#define NHRP_FLAG_REGISTRATION_NAT 0x0002
71
72/* NHRP Flags for Purge request/reply */
73#define NHRP_FLAG_PURGE_NO_REPLY 0x8000
74
75/* NHRP Authentication extension types (ala Cisco) */
76#define NHRP_AUTHENTICATION_PLAINTEXT 0x00000001
77
78/* NHRP Packet Structures */
79struct nhrp_packet_header {
80 /* Fixed header */
81 uint16_t afnum;
82 uint16_t protocol_type;
83 uint8_t snap[5];
84 uint8_t hop_count;
85 uint16_t packet_size;
86 uint16_t checksum;
87 uint16_t extension_offset;
88 uint8_t version;
89 uint8_t type;
90 uint8_t src_nbma_address_len;
91 uint8_t src_nbma_subaddress_len;
92
93 /* Mandatory header */
94 uint8_t src_protocol_address_len;
95 uint8_t dst_protocol_address_len;
96 uint16_t flags;
97 union {
98 uint32_t request_id;
99 struct {
100 uint16_t code;
101 uint16_t offset;
102 } error;
103 } u;
104} __attribute__((packed));
105
106struct nhrp_cie_header {
107 uint8_t code;
108 uint8_t prefix_length;
109 uint16_t unused;
110 uint16_t mtu;
111 uint16_t holding_time;
112 uint8_t nbma_address_len;
113 uint8_t nbma_subaddress_len;
114 uint8_t protocol_address_len;
115 uint8_t preference;
116} __attribute__((packed));
117
118struct nhrp_extension_header {
119 uint16_t type;
120 uint16_t length;
121} __attribute__((packed));
122
123struct nhrp_cisco_authentication_extension {
124 uint32_t type;
125 uint8_t secret[8];
126} __attribute__((packed));
127
128#endif