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// SPDX-License-Identifier: MIT
/* nhrp_protocol.h - NHRP protocol definitions
*
* Copyright (c) 2007-2012 Timo Teräs <timo.teras@iki.fi>
*/
#ifndef NHRP_PROTOCOL_H
#define NHRP_PROTOCOL_H
#include <stdint.h>
/* NHRP Ethernet protocol number */
#define ETH_P_NHRP 0x2001
/* NHRP Version */
#define NHRP_VERSION_RFC2332 1
/* NHRP Packet Types */
#define NHRP_PACKET_RESOLUTION_REQUEST 1
#define NHRP_PACKET_RESOLUTION_REPLY 2
#define NHRP_PACKET_REGISTRATION_REQUEST 3
#define NHRP_PACKET_REGISTRATION_REPLY 4
#define NHRP_PACKET_PURGE_REQUEST 5
#define NHRP_PACKET_PURGE_REPLY 6
#define NHRP_PACKET_ERROR_INDICATION 7
#define NHRP_PACKET_TRAFFIC_INDICATION 8
#define NHRP_PACKET_MAX 8
/* NHRP Extension Types */
#define NHRP_EXTENSION_FLAG_COMPULSORY 0x8000
#define NHRP_EXTENSION_END 0
#define NHRP_EXTENSION_PAYLOAD 0
#define NHRP_EXTENSION_RESPONDER_ADDRESS 3
#define NHRP_EXTENSION_FORWARD_TRANSIT_NHS 4
#define NHRP_EXTENSION_REVERSE_TRANSIT_NHS 5
#define NHRP_EXTENSION_AUTHENTICATION 7
#define NHRP_EXTENSION_VENDOR 8
#define NHRP_EXTENSION_NAT_ADDRESS 9
/* NHRP Error Indication Codes */
#define NHRP_ERROR_UNRECOGNIZED_EXTENSION 1
#define NHRP_ERROR_LOOP_DETECTED 2
#define NHRP_ERROR_PROTOCOL_ADDRESS_UNREACHABLE 6
#define NHRP_ERROR_PROTOCOL_ERROR 7
#define NHRP_ERROR_SDU_SIZE_EXCEEDED 8
#define NHRP_ERROR_INVALID_EXTENSION 9
#define NHRP_ERROR_INVALID_RESOLUTION_REPLY 10
#define NHRP_ERROR_AUTHENTICATION_FAILURE 11
#define NHRP_ERROR_HOP_COUNT_EXCEEDED 15
/* NHRP CIE Codes */
#define NHRP_CODE_SUCCESS 0
#define NHRP_CODE_ADMINISTRATIVELY_PROHIBITED 4
#define NHRP_CODE_INSUFFICIENT_RESOURCES 5
#define NHRP_CODE_NO_BINDING_EXISTS 11
#define NHRP_CODE_BINDING_NON_UNIQUE 13
#define NHRP_CODE_UNIQUE_ADDRESS_REGISTERED 14
/* NHRP Flags for Resolution request/reply */
#define NHRP_FLAG_RESOLUTION_SOURCE_IS_ROUTER 0x8000
#define NHRP_FLAG_RESOLUTION_AUTHORATIVE 0x4000
#define NHRP_FLAG_RESOLUTION_DESTINATION_STABLE 0x2000
#define NHRP_FLAG_RESOLUTION_UNIQUE 0x1000
#define NHRP_FLAG_RESOLUTION_SOURCE_STABLE 0x0800
#define NHRP_FLAG_RESOLUTION_NAT 0x0002
/* NHRP Flags for Registration request/reply */
#define NHRP_FLAG_REGISTRATION_UNIQUE 0x8000
#define NHRP_FLAG_REGISTRATION_NAT 0x0002
/* NHRP Flags for Purge request/reply */
#define NHRP_FLAG_PURGE_NO_REPLY 0x8000
/* NHRP Authentication extension types (ala Cisco) */
#define NHRP_AUTHENTICATION_PLAINTEXT 0x00000001
/* NHRP Packet Structures */
struct nhrp_packet_header {
/* Fixed header */
uint16_t afnum;
uint16_t protocol_type;
uint8_t snap[5];
uint8_t hop_count;
uint16_t packet_size;
uint16_t checksum;
uint16_t extension_offset;
uint8_t version;
uint8_t type;
uint8_t src_nbma_address_len;
uint8_t src_nbma_subaddress_len;
/* Mandatory header */
uint8_t src_protocol_address_len;
uint8_t dst_protocol_address_len;
uint16_t flags;
union {
uint32_t request_id;
struct {
uint16_t code;
uint16_t offset;
} error;
} u;
} __attribute__((packed));
struct nhrp_cie_header {
uint8_t code;
uint8_t prefix_length;
uint16_t unused;
uint16_t mtu;
uint16_t holding_time;
uint8_t nbma_address_len;
uint8_t nbma_subaddress_len;
uint8_t protocol_address_len;
uint8_t preference;
} __attribute__((packed));
struct nhrp_extension_header {
uint16_t type;
uint16_t length;
} __attribute__((packed));
struct nhrp_cisco_authentication_extension {
uint32_t type;
uint8_t secret[8];
} __attribute__((packed));
#endif
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