1 /* nhrp_protocol.h - NHRP protocol definitions
3 * Copyright (c) 2007-2012 Timo Teräs <timo.teras@iki.fi>
5 * This software is licensed under the MIT License.
6 * See MIT-LICENSE.txt for additional details.
9 #ifndef NHRP_PROTOCOL_H
10 #define NHRP_PROTOCOL_H
14 /* NHRP Ethernet protocol number */
15 #define ETH_P_NHRP 0x2001
18 #define NHRP_VERSION_RFC2332 1
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 #define NHRP_PACKET_MAX 8
31 /* NHRP Extension Types */
32 #define NHRP_EXTENSION_FLAG_COMPULSORY 0x8000
33 #define NHRP_EXTENSION_END 0
34 #define NHRP_EXTENSION_PAYLOAD 0
35 #define NHRP_EXTENSION_RESPONDER_ADDRESS 3
36 #define NHRP_EXTENSION_FORWARD_TRANSIT_NHS 4
37 #define NHRP_EXTENSION_REVERSE_TRANSIT_NHS 5
38 #define NHRP_EXTENSION_AUTHENTICATION 7
39 #define NHRP_EXTENSION_VENDOR 8
40 #define NHRP_EXTENSION_NAT_ADDRESS 9
42 /* NHRP Error Indication Codes */
43 #define NHRP_ERROR_UNRECOGNIZED_EXTENSION 1
44 #define NHRP_ERROR_LOOP_DETECTED 2
45 #define NHRP_ERROR_PROTOCOL_ADDRESS_UNREACHABLE 6
46 #define NHRP_ERROR_PROTOCOL_ERROR 7
47 #define NHRP_ERROR_SDU_SIZE_EXCEEDED 8
48 #define NHRP_ERROR_INVALID_EXTENSION 9
49 #define NHRP_ERROR_INVALID_RESOLUTION_REPLY 10
50 #define NHRP_ERROR_AUTHENTICATION_FAILURE 11
51 #define NHRP_ERROR_HOP_COUNT_EXCEEDED 15
54 #define NHRP_CODE_SUCCESS 0
55 #define NHRP_CODE_ADMINISTRATIVELY_PROHIBITED 4
56 #define NHRP_CODE_INSUFFICIENT_RESOURCES 5
57 #define NHRP_CODE_NO_BINDING_EXISTS 11
58 #define NHRP_CODE_BINDING_NON_UNIQUE 13
59 #define NHRP_CODE_UNIQUE_ADDRESS_REGISTERED 14
61 /* NHRP Flags for Resolution request/reply */
62 #define NHRP_FLAG_RESOLUTION_SOURCE_IS_ROUTER 0x8000
63 #define NHRP_FLAG_RESOLUTION_AUTHORATIVE 0x4000
64 #define NHRP_FLAG_RESOLUTION_DESTINATION_STABLE 0x2000
65 #define NHRP_FLAG_RESOLUTION_UNIQUE 0x1000
66 #define NHRP_FLAG_RESOLUTION_SOURCE_STABLE 0x0800
67 #define NHRP_FLAG_RESOLUTION_NAT 0x0002
69 /* NHRP Flags for Registration request/reply */
70 #define NHRP_FLAG_REGISTRATION_UNIQUE 0x8000
71 #define NHRP_FLAG_REGISTRATION_NAT 0x0002
73 /* NHRP Flags for Purge request/reply */
74 #define NHRP_FLAG_PURGE_NO_REPLY 0x8000
76 /* NHRP Authentication extension types (ala Cisco) */
77 #define NHRP_AUTHENTICATION_PLAINTEXT 0x00000001
79 /* NHRP Packet Structures */
80 struct nhrp_packet_header
{
83 uint16_t protocol_type
;
88 uint16_t extension_offset
;
91 uint8_t src_nbma_address_len
;
92 uint8_t src_nbma_subaddress_len
;
94 /* Mandatory header */
95 uint8_t src_protocol_address_len
;
96 uint8_t dst_protocol_address_len
;
105 } __attribute__((packed
));
107 struct nhrp_cie_header
{
109 uint8_t prefix_length
;
112 uint16_t holding_time
;
113 uint8_t nbma_address_len
;
114 uint8_t nbma_subaddress_len
;
115 uint8_t protocol_address_len
;
117 } __attribute__((packed
));
119 struct nhrp_extension_header
{
122 } __attribute__((packed
));
124 struct nhrp_cisco_authentication_extension
{
127 } __attribute__((packed
));