/*

 * Copyright (c) 1982, 1986, 1993

 *	The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *	This product includes software developed by the University of

 *	California, Berkeley and its contributors.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *	@(#)ip.h	8.1 (Berkeley) 6/10/93

 * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp

 */

#ifndef _IP_H_

#define _IP_H_

#ifdef WORDS_BIGENDIAN

# ifndef NTOHL

#  define NTOHL(d)

# endif

# ifndef NTOHS

#  define NTOHS(d)

# endif

# ifndef HTONL

#  define HTONL(d)

# endif

# ifndef HTONS

#  define HTONS(d)

# endif

#else

# ifndef NTOHL

#  define NTOHL(d) ((d) = ntohl((d)))

# endif

# ifndef NTOHS

#  define NTOHS(d) ((d) = ntohs((u_int16_t)(d)))

# endif

# ifndef HTONL

#  define HTONL(d) ((d) = htonl((d)))

# endif

# ifndef HTONS

#  define HTONS(d) ((d) = htons((u_int16_t)(d)))

# endif

#endif

typedef u_int32_t n_long;                 /* long as received from the net */

/*

 * Definitions for internet protocol version 4.

 * Per RFC 791, September 1981.

 */

#define	IPVERSION	4

/*

 * Structure of an internet header, naked of options.

 */

struct ip {

#ifdef WORDS_BIGENDIAN

	u_int ip_v:4,			/* version */

		ip_hl:4;		/* header length */

#else

	u_int ip_hl:4,		/* header length */

		ip_v:4;			/* version */

#endif

	u_int8_t ip_tos;			/* type of service */

	u_int16_t	ip_len;			/* total length */

	u_int16_t	ip_id;			/* identification */

	u_int16_t	ip_off;			/* fragment offset field */

#define	IP_DF 0x4000			/* don't fragment flag */

#define	IP_MF 0x2000			/* more fragments flag */

#define	IP_OFFMASK 0x1fff		/* mask for fragmenting bits */

	u_int8_t ip_ttl;			/* time to live */

	u_int8_t ip_p;			/* protocol */

	u_int16_t	ip_sum;			/* checksum */

	struct	in_addr ip_src,ip_dst;	/* source and dest address */

};

#define	IP_MAXPACKET	65535		/* maximum packet size */

/*

 * Definitions for IP type of service (ip_tos)

 */

#define	IPTOS_LOWDELAY		0x10

#define	IPTOS_THROUGHPUT	0x08

#define	IPTOS_RELIABILITY	0x04

/*

 * Definitions for options.

 */

#define	IPOPT_COPIED(o)		((o)&0x80)

#define	IPOPT_CLASS(o)		((o)&0x60)

#define	IPOPT_NUMBER(o)		((o)&0x1f)

#define	IPOPT_CONTROL		0x00

#define	IPOPT_RESERVED1		0x20

#define	IPOPT_DEBMEAS		0x40

#define	IPOPT_RESERVED2		0x60

#define	IPOPT_EOL		0		/* end of option list */

#define	IPOPT_NOP		1		/* no operation */

#define	IPOPT_RR		7		/* record packet route */

#define	IPOPT_TS		68		/* timestamp */

#define	IPOPT_SECURITY		130		/* provide s,c,h,tcc */

#define	IPOPT_LSRR		131		/* loose source route */

#define	IPOPT_SATID		136		/* satnet id */

#define	IPOPT_SSRR		137		/* strict source route */

/*

 * Offsets to fields in options other than EOL and NOP.

 */

#define	IPOPT_OPTVAL		0		/* option ID */

#define	IPOPT_OLEN		1		/* option length */

#define IPOPT_OFFSET		2		/* offset within option */

#define	IPOPT_MINOFF		4		/* min value of above */

/*

 * Time stamp option structure.

 */

struct	ip_timestamp {

	u_int8_t	ipt_code;		/* IPOPT_TS */

	u_int8_t	ipt_len;		/* size of structure (variable) */

	u_int8_t	ipt_ptr;		/* index of current entry */

#ifdef WORDS_BIGENDIAN

	u_int	ipt_oflw:4,		/* overflow counter */

		ipt_flg:4;		/* flags, see below */

#else

	u_int	ipt_flg:4,		/* flags, see below */

		ipt_oflw:4;		/* overflow counter */

#endif

	union ipt_timestamp {

		n_long	ipt_time[1];

		struct	ipt_ta {

			struct in_addr ipt_addr;

			n_long ipt_time;

		} ipt_ta[1];

	} ipt_timestamp;

};

/* flag bits for ipt_flg */

#define	IPOPT_TS_TSONLY		0		/* timestamps only */

#define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */

#define	IPOPT_TS_PRESPEC	3		/* specified modules only */

/* bits for security (not byte swapped) */

#define	IPOPT_SECUR_UNCLASS	0x0000

#define	IPOPT_SECUR_CONFID	0xf135

#define	IPOPT_SECUR_EFTO	0x789a

#define	IPOPT_SECUR_MMMM	0xbc4d

#define	IPOPT_SECUR_RESTR	0xaf13

#define	IPOPT_SECUR_SECRET	0xd788

#define	IPOPT_SECUR_TOPSECRET	0x6bc5

/*

 * Internet implementation parameters.

 */

#define	MAXTTL		255		/* maximum time to live (seconds) */

#define	IPDEFTTL	64		/* default ttl, from RFC 1340 */

#define	IPFRAGTTL	60		/* time to live for frags, slowhz */

#define	IPTTLDEC	1		/* subtracted when forwarding */

#define	IP_MSS		576		/* default maximum segment size */

#ifdef HAVE_SYS_TYPES32_H  /* Overcome some Solaris 2.x junk */

#include <sys/types32.h>

#else

#if SIZEOF_CHAR_P == 4

typedef caddr_t caddr32_t;

#else

typedef u_int32_t caddr32_t;

#endif

#endif

#if SIZEOF_CHAR_P == 4

typedef struct ipq *ipqp_32;

typedef struct ipasfrag *ipasfragp_32;

#else

typedef caddr32_t ipqp_32;

typedef caddr32_t ipasfragp_32;

#endif

/*

 * Overlay for ip header used by other protocols (tcp, udp).

 */

struct ipovly {

	caddr32_t	ih_next, ih_prev;	/* for protocol sequence q's */

	u_int8_t	ih_x1;			/* (unused) */

	u_int8_t	ih_pr;			/* protocol */

	u_int16_t	ih_len;			/* protocol length */

	struct	in_addr ih_src;		/* source internet address */

	struct	in_addr ih_dst;		/* destination internet address */

};

/*

 * Ip reassembly queue structure.  Each fragment

 * being reassembled is attached to one of these structures.

 * They are timed out after ipq_ttl drops to 0, and may also

 * be reclaimed if memory becomes tight.

 * size 28 bytes

 */

struct ipq {

	ipqp_32 next,prev;	/* to other reass headers */

	u_int8_t	ipq_ttl;		/* time for reass q to live */

	u_int8_t	ipq_p;			/* protocol of this fragment */

	u_int16_t	ipq_id;			/* sequence id for reassembly */

	ipasfragp_32 ipq_next,ipq_prev;

					/* to ip headers of fragments */

	struct	in_addr ipq_src,ipq_dst;

};

/*

 * Ip header, when holding a fragment.

 *

 * Note: ipf_next must be at same offset as ipq_next above

 */

struct	ipasfrag {

#ifdef WORDS_BIGENDIAN

	u_int	ip_v:4,

 		ip_hl:4;

#else

	u_int	ip_hl:4,

		ip_v:4;

#endif

                                        /* BUG : u_int changed to u_int8_t.

                                         * sizeof(u_int)==4 on linux 2.0

					 */

        u_int8_t ipf_mff;		/* XXX overlays ip_tos: use low bit

					 * to avoid destroying tos (PPPDTRuu);

					 * copied from (ip_off&IP_MF) */

	u_int16_t	ip_len;

	u_int16_t	ip_id;

	u_int16_t	ip_off;

	u_int8_t	ip_ttl;

	u_int8_t	ip_p;

	u_int16_t	ip_sum;

	ipasfragp_32 ipf_next;		/* next fragment */

	ipasfragp_32 ipf_prev;		/* previous fragment */

};

/*

 * Structure stored in mbuf in inpcb.ip_options

 * and passed to ip_output when ip options are in use.

 * The actual length of the options (including ipopt_dst)

 * is in m_len.

 */

#define MAX_IPOPTLEN	40

struct ipoption {

	struct	in_addr ipopt_dst;	/* first-hop dst if source routed */

	int8_t	ipopt_list[MAX_IPOPTLEN];	/* options proper */

};

#ifdef LOG_ENABLED

/*

 * Structure attached to inpcb.ip_moptions and

 * passed to ip_output when IP multicast options are in use.

 */

struct	ipstat {

	u_long	ips_total;		/* total packets received */

	u_long	ips_badsum;		/* checksum bad */

	u_long	ips_tooshort;		/* packet too short */

	u_long	ips_toosmall;		/* not enough data */

	u_long	ips_badhlen;		/* ip header length < data size */

	u_long	ips_badlen;		/* ip length < ip header length */

	u_long	ips_fragments;		/* fragments received */

	u_long	ips_fragdropped;	/* frags dropped (dups, out of space) */

	u_long	ips_fragtimeout;	/* fragments timed out */

	u_long	ips_forward;		/* packets forwarded */

	u_long	ips_cantforward;	/* packets rcvd for unreachable dest */

	u_long	ips_redirectsent;	/* packets forwarded on same net */

	u_long	ips_noproto;		/* unknown or unsupported protocol */

	u_long	ips_delivered;		/* datagrams delivered to upper level*/

	u_long	ips_localout;		/* total ip packets generated here */

	u_long	ips_odropped;		/* lost packets due to nobufs, etc. */

	u_long	ips_reassembled;	/* total packets reassembled ok */

	u_long	ips_fragmented;		/* datagrams successfully fragmented */

	u_long	ips_ofragments;		/* output fragments created */

	u_long	ips_cantfrag;		/* don't fragment flag was set, etc. */

	u_long	ips_badoptions;		/* error in option processing */

	u_long	ips_noroute;		/* packets discarded due to no route */

	u_long	ips_badvers;		/* ip version != 4 */

	u_long	ips_rawout;		/* total raw ip packets generated */

	u_long	ips_unaligned;		/* times the ip packet was not aligned */

};

extern struct	ipstat	ipstat;

#endif

extern struct	ipq	ipq;			/* ip reass. queue */

extern u_int16_t	ip_id;				/* ip packet ctr, for ids */

#endif