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/* nhrp_protocol.h - NHRP protocol definitions
*
* Copyright (c) 2007-2012 Timo Teräs <timo.teras@iki.fi>
*
* This software is licensed under the MIT License.
* See MIT-LICENSE.txt for additional details.
*/
#ifndef NHRP_PROTOCOL_H
#define NHRP_PROTOCOL_H
#include <stdint.h>
#include "afnum.h"
/* 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
/* 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 constant_htons(1)
#define NHRP_ERROR_LOOP_DETECTED constant_htons(2)
#define NHRP_ERROR_PROTOCOL_ADDRESS_UNREACHABLE constant_htons(6)
#define NHRP_ERROR_PROTOCOL_ERROR constant_htons(7)
#define NHRP_ERROR_SDU_SIZE_EXCEEDED constant_htons(8)
#define NHRP_ERROR_INVALID_EXTENSION constant_htons(9)
#define NHRP_ERROR_INVALID_RESOLUTION_REPLY constant_htons(10)
#define NHRP_ERROR_AUTHENTICATION_FAILURE constant_htons(11)
#define NHRP_ERROR_HOP_COUNT_EXCEEDED constant_htons(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 constant_htons(0x8000)
#define NHRP_FLAG_RESOLUTION_AUTHORATIVE constant_htons(0x4000)
#define NHRP_FLAG_RESOLUTION_DESTINATION_STABLE constant_htons(0x2000)
#define NHRP_FLAG_RESOLUTION_UNIQUE constant_htons(0x1000)
#define NHRP_FLAG_RESOLUTION_SOURCE_STABLE constant_htons(0x0800)
#define NHRP_FLAG_RESOLUTION_NAT constant_htons(0x0002)
/* NHRP Flags for Registration request/reply */
#define NHRP_FLAG_REGISTRATION_UNIQUE constant_htons(0x8000)
#define NHRP_FLAG_REGISTRATION_NAT constant_htons(0x0002)
/* NHRP Flags for Purge request/reply */
#define NHRP_FLAG_PURGE_NO_REPLY constant_htons(0x8000)
/* NHRP Authentication extension types (ala Cisco) */
#define NHRP_AUTHENTICATION_PLAINTEXT constant_htonl(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;
};
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;
};
struct nhrp_extension_header {
uint16_t type;
uint16_t length;
};
struct nhrp_cisco_authentication_extension {
uint32_t type;
uint8_t secret[8];
};
#endif
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