LCOM1920-T02G10

/*        $NetBSD: ip.h,v 1.34 2012/11/02 21:07:07 christos Exp $        */

/*

 * 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. 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        8.2 (Berkeley) 6/1/94

 */

#ifndef _NETINET_IP_H_

#define _NETINET_IP_H_

#include <netinet/in_systm.h>        /* for n_time */

/*

 * Definitions for internet protocol version 4.

 * Per RFC 791, September 1981.

 */

#define        IPVERSION        4

/*

 * Structure of an internet header, naked of options.

 */

struct ip {

#if BYTE_ORDER == LITTLE_ENDIAN

        unsigned int ip_hl:4,                /* header length */

                     ip_v:4;                /* version */

#endif

#if BYTE_ORDER == BIG_ENDIAN

        unsigned int ip_v:4,                /* version */

                     ip_hl:4;                /* header length */

#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_RF 0x8000                        /* reserved fragment flag */

#define        IP_EF 0x8000                        /* evil flag, per RFC 3514 */

#define        IP_DF 0x4000                        /* dont 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 */

} __packed;

#define        IP_MAXPACKET        65535                /* maximum packet size */

#define        IP_MINFRAGSIZE        69                /* minumum size that can be fraged */

/*

 * Definitions for IP type of service (ip_tos)

 */

/*

 * Definitions for DiffServ Codepoints as per RFC2474

 */

#define        IPTOS_DSCP_CS0                0x00

#define        IPTOS_DSCP_CS1                0x20

#define        IPTOS_DSCP_AF11                0x28

#define        IPTOS_DSCP_AF12                0x30

#define        IPTOS_DSCP_AF13                0x38

#define        IPTOS_DSCP_CS2                0x40

#define        IPTOS_DSCP_AF21                0x48

#define        IPTOS_DSCP_AF22                0x50

#define        IPTOS_DSCP_AF23                0x58

#define        IPTOS_DSCP_CS3                0x60

#define        IPTOS_DSCP_AF31                0x68

#define        IPTOS_DSCP_AF32                0x70

#define        IPTOS_DSCP_AF33                0x78

#define        IPTOS_DSCP_CS4                0x80

#define        IPTOS_DSCP_AF41                0x88

#define        IPTOS_DSCP_AF42                0x90

#define        IPTOS_DSCP_AF43                0x98

#define        IPTOS_DSCP_CS5                0xa0

#define        IPTOS_DSCP_EF                0xb8

#define        IPTOS_DSCP_CS6                0xc0

#define        IPTOS_DSCP_CS7                0xe0

/*

 * Definitions for DiffServ Class Selector Codepoints

 */

#define        IPTOS_CLASS_CS0                0x00

#define        IPTOS_CLASS_CS1                0x20

#define        IPTOS_CLASS_CS2                0x40

#define        IPTOS_CLASS_CS3                0x60

#define        IPTOS_CLASS_CS4                0x80

#define        IPTOS_CLASS_CS5                0xa0

#define        IPTOS_CLASS_CS6                0xc0

#define        IPTOS_CLASS_CS7                0xe0

#define        IPTOS_CLASS_DEFAULT        IPTOS_CLASS_CS0

#define        IPTOS_CLASS_MASK        0xe0

#define        IPTOS_CLASS(cs)                ((cs) & IPTOS_CLASS_MASK)

#define        IPTOS_DSCP_MASK                0xfc

#define        IPTOS_DSCP(cp)                ((cp) & IPTOS_DSCP_MASK)

/*

 * ECN (Explicit Congestion Notification) codepoints in RFC3168

 * mapped to the lower 2 bits of the TOS field.

 */

#define        IPTOS_ECN_NOTECT        0x00        /* not-ECT */

#define        IPTOS_ECN_ECT1                0x01        /* ECN-capable transport (1) */

#define        IPTOS_ECN_ECT0                0x02        /* ECN-capable transport (0) */

#define        IPTOS_ECN_CE                0x03        /* congestion experienced */

#define        IPTOS_ECN_MASK                0x03        /* ECN field mask */

#define        IPTOS_ECN(cn)                ((cn) & IPTOS_ECN_MASK)

#define        IPTOS_ECN_NOT_ECT        0x00

/*

 * Definitions for IP type of service per RFC1349 (ip_tos)

 * DEPRECATED

 */

#define        IPTOS_LOWDELAY                0x10

#define        IPTOS_THROUGHPUT        0x08

#define        IPTOS_RELIABILITY        0x04

#define        IPTOS_MINCOST                0x02

/* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */

#define        IPTOS_CE                0x01        /* congestion experienced */

#define        IPTOS_ECT                0x02        /* ECN-capable transport */

/*

 * Definitions for IP precedence per RFC1195 (also in ip_tos) (hopefully unused)

 */

#define        IPTOS_PREC_NETCONTROL                0xe0

#define        IPTOS_PREC_INTERNETCONTROL        0xc0

#define        IPTOS_PREC_CRITIC_ECP                0xa0

#define        IPTOS_PREC_FLASHOVERRIDE        0x80

#define        IPTOS_PREC_FLASH                0x60

#define        IPTOS_PREC_IMMEDIATE                0x40

#define        IPTOS_PREC_PRIORITY                0x20

#define        IPTOS_PREC_ROUTINE                0x00

/*

 * 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 */

#if BYTE_ORDER == LITTLE_ENDIAN

        unsigned int ipt_flg:4,                /* flags, see below */

                     ipt_oflw:4;        /* overflow counter */

#endif

#if BYTE_ORDER == BIG_ENDIAN

        unsigned int ipt_oflw:4,        /* overflow counter */

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

#endif

        union ipt_timestamp {

                 n_time        ipt_time[1];

                 struct        ipt_ta {

                        struct in_addr ipt_addr;

                        n_time ipt_time;

                 } ipt_ta[1] __packed;

        } ipt_timestamp __packed;

} __packed;

/* 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 */

/*

 * This is the real IPv4 pseudo header, used for computing the TCP and UDP

 * checksums. For the Internet checksum, struct ipovly can be used instead.

 * For stronger checksums, the real thing must be used.

 */

struct ippseudo {

        struct        in_addr        ippseudo_src;        /* source internet address */

        struct        in_addr        ippseudo_dst;        /* destination internet address */

        u_int8_t        ippseudo_pad;        /* pad, must be zero */

        u_int8_t        ippseudo_p;        /* protocol */

        u_int16_t        ippseudo_len;        /* protocol length */

} __packed;

#endif /* !_NETINET_IP_H_ */