/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Bootstrap Protocol (BOOTP).  RFC 951.
 */
/*
 * HISTORY
 *
 * 14 May 1992 ? at NeXT
 *	Added correct padding to struct nextvend.  This is
 *	needed for the i386 due to alignment differences wrt
 *	the m68k.  Also adjusted the size of the array fields
 *	because the NeXT vendor area was overflowing the bootp
 *	packet.
 */

#define iaddr_t struct in_addr

struct bootp {
	u_char	bp_op;		/* packet opcode type */
#define	BOOTREQUEST	1
#define	BOOTREPLY	2
	u_char	bp_htype;	/* hardware addr type */
	u_char	bp_hlen;	/* hardware addr length */
	u_char	bp_hops;	/* gateway hops */
	u_long	bp_xid;		/* transaction ID */
	u_short	bp_secs;	/* seconds since boot began */	
	u_short	bp_unused;
	iaddr_t	bp_ciaddr;	/* client IP address */
	iaddr_t	bp_yiaddr;	/* 'your' IP address */
	iaddr_t	bp_siaddr;	/* server IP address */
	iaddr_t	bp_giaddr;	/* gateway IP address */
	u_char	bp_chaddr[16];	/* client hardware address */
	u_char	bp_sname[64];	/* server host name */
	u_char	bp_file[128];	/* boot file name */
	u_char	bp_vend[64];	/* vendor-specific area */
};

/*
 * UDP port numbers, server and client.
 */
#define	IPPORT_BOOTPS		67
#define	IPPORT_BOOTPC		68

/*
 * "vendor" data permitted for Stanford boot clients.
 */
struct vend {
	u_char	v_magic[4];	/* magic number */
	u_long	v_flags;	/* flags/opcodes, etc. */
	u_char	v_unused[56];	/* currently unused */
};
#define	VM_STANFORD	"STAN"	/* v_magic for Stanford */

/* v_flags values */
#define	VF_PCBOOT	1	/* an IBMPC or Mac wants environment info */
#define	VF_HELP		2	/* help me, I'm not registered */

#define	NVMAXTEXT	55	/* don't change this, it just fits RFC951 */
struct nextvend {
	u_char nv_magic[4];	/* Magic number for vendor specificity */
	u_char nv_version;	/* NeXT protocol version */
	/*
	 * Round the beginning
	 * of the union to a 16
	 * bit boundary due to
	 * struct/union alignment
	 * on the m68k.
	 */
	unsigned short	:0;	
	union {
		u_char NV0[58];
		struct {
			u_char NV1_opcode;	/* opcode - Version 1 */
			u_char NV1_xid;	/* transcation id */
			u_char NV1_text[NVMAXTEXT];	/* text */
			u_char NV1_null;	/* null terminator */
		} NV1;
	} nv_U;
};
#define	nv_unused	nv_U.NV0
#define	nv_opcode	nv_U.NV1.NV1_opcode
#define	nv_xid		nv_U.NV1.NV1_xid
#define	nv_text		nv_U.NV1.NV1_text
#define nv_null		nv_U.NV1.NV1_null

/* Magic number */
#define VM_NEXT		"NeXT"	/* v_magic for NeXT, Inc. */

/* Opcodes */
#define	BPOP_OK		0
#define BPOP_QUERY	1
#define	BPOP_QUERY_NE	2
#define	BPOP_ERROR	3

struct bootp_packet {
    struct ip bp_ip;
    struct udphdr bp_udp;
    struct bootp bp_bootp;
};

#define	BOOTP_PKTSIZE (sizeof (struct bootp_packet))

/* backoffs must be masks */
#define	BOOTP_MIN_BACKOFF	0x7ff		/* 2.048 sec */
#define	BOOTP_MAX_BACKOFF	0xffff		/* 65.535 sec */
#define	BOOTP_RETRY		6		/* # retries */

