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/*

 * 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.

 *

 * We declare ip_len and ip_off to be short, rather than u_short

 * pragmatically since otherwise unsigned comparisons can result

 * against negative integers quite easily, and fail in subtle ways.

 */

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 */

        int16_t        ip_len;                        /* total length */

        u_int16_t        ip_id;                        /* identification */

        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 */

        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) */

        int16_t        ip_len;

        u_int16_t        ip_id;

        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 */

};

/*

 * 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;

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

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

extern int        ip_defttl;                        /* default IP ttl */

#endif