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/* $OpenBSD: dhcp.h,v 1.1 2017/03/17 14:45:16 rzalamena Exp $ */
/*
* Copyright (c) 2017 Rafael Zalamena <rzalamena@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _DHCP_H_
#define _DHCP_H_
/* Maximum DHCP packet size. */
#define DHCP_MTU_MAX 1500
/*
* Enterprise numbers can be found at:
* http://www.iana.org/assignments/enterprise-numbers
*/
#define OPENBSD_ENTERPRISENO 30155
#define ENTERPRISENO_LEN sizeof(uint32_t)
/*
* DHCPv6 definitions and structures defined by the protocol
* specification (RFC 3315).
*
* The relay part of DHCPv6 is specified in section 20 of RFC 3315 and
* in the RFC 6221.
*/
/*
* RFC 3315 Section 5.1 Multicast Addresses:
* All_DHCP_Relay_Agents_and_Servers: FF02::1:2
* All_DHCP_Servers: FF05::1:3
*/
#define DHCP6_ADDR_RELAYSERVER "FF02::1:2"
#define DHCP6_ADDR_SERVER "FF05::1:3"
/* DHCPv6 client/server ports */
#define DHCP6_CLIENT_PORT 546
#define DHCP6_CLIENT_PORT_STR "546"
#define DHCP6_SERVER_PORT 547
#define DHCP6_SERVER_PORT_STR "547"
/* DHCPv6 message types. */
#define DHCP6_MT_SOLICIT 1
#define DHCP6_MT_ADVERTISE 2
#define DHCP6_MT_REQUEST 3
#define DHCP6_MT_CONFIRM 4
#define DHCP6_MT_RENEW 5
#define DHCP6_MT_REBIND 6
#define DHCP6_MT_REPLY 7
#define DHCP6_MT_RELEASE 8
#define DHCP6_MT_DECLINE 9
#define DHCP6_MT_RECONFIGURE 10
#define DHCP6_MT_INFORMATIONREQUEST 11
#define DHCP6_MT_RELAYFORW 12
#define DHCP6_MT_RELAYREPL 13
/* Maximum amount of hops limit by default. */
#define DHCP6_HOP_LIMIT 32
/* DHCPv6 option definitions. */
#define DHCP6_OPT_CLIENTID 1
#define DHCP6_OPT_SERVERID 2
/* IANA - Identity Association for Non-temporary Address */
#define DHCP6_OPT_IANA 3
/* IATA - Identity Association for Temporary Address */
#define DHCP6_OPT_IATA 4
/* IA Addr - Identity Association Address */
#define DHCP6_OPT_IAADDR 5
/* ORO - Option Request Option */
#define DHCP6_OPT_ORO 6
#define DHCP6_OPT_PREFERENCE 7
#define DHCP6_OPT_ELAPSED_TIME 8
#define DHCP6_OPT_RELAY_MSG 9
#define DHCP6_OPT_AUTH 11
#define DHCP6_OPT_UNICAST 12
#define DHCP6_OPT_STATUSCODE 13
#define DHCP6_OPT_RAPIDCOMMIT 14
#define DHCP6_OPT_USERCLASS 15
#define DHCP6_OPT_VENDORCLASS 16
#define DHCP6_OPT_VENDOROPTS 17
#define DHCP6_OPT_INTERFACEID 18
#define DHCP6_OPT_RECONFMSG 19
#define DHCP6_OPT_RECONFACCEPT 20
/* Remote-ID is defined at RFC 4649. */
#define DHCP6_OPT_REMOTEID 37
/* DHCP option used in DHCP request/reply/relay packets. */
struct dhcp6_option {
/* DHCP option code. */
uint16_t dso_code;
/* DHCP option payload length. */
uint16_t dso_length;
/* DHCP option data. */
uint8_t dso_data[];
} __packed;
/* Client / Server message format. */
struct dhcp6_packet {
uint8_t ds_msgtype; /* message type */
uint8_t ds_transactionid[3]; /* transaction id */
struct dhcp6_option ds_options[];
} __packed;
/* Relay Agent/Server message format. */
struct dhcp6_relay_packet {
/* Message type: DHCP6_MT_RELAYFORW or DHCP6_MT_RELAYREPL */
uint8_t dsr_msgtype;
/* Number of relay agents that relayed this message. */
uint8_t dsr_hopcount;
/*
* A global or site local address used by the server to Identify
* the client link.
*/
struct in6_addr dsr_linkaddr;
/*
* The address of the client or relay agent from which the relayed
* message was received.
*/
struct in6_addr dsr_peer;
/* Must include a relay message option. */
struct dhcp6_option dsr_options[];
} __packed;
#endif /* _DHCP_H_ */
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