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      1 /* Copyright (C) 1991,92,93,95,96,97,98,99,2000 Free Software Foundation, Inc.
      2    This file is part of the GNU C Library.
      3 
      4    The GNU C Library is free software; you can redistribute it and/or
      5    modify it under the terms of the GNU Lesser General Public
      6    License as published by the Free Software Foundation; either
      7    version 2.1 of the License, or (at your option) any later version.
      8 
      9    The GNU C Library is distributed in the hope that it will be useful,
     10    but WITHOUT ANY WARRANTY; without even the implied warranty of
     11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12    Lesser General Public License for more details.
     13 
     14    You should have received a copy of the GNU Lesser General Public
     15    License along with the GNU C Library; if not, write to the Free
     16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     17    02111-1307 USA.  */
     18 
     19 #ifndef __NETINET_IP_H
     20 #define __NETINET_IP_H 1
     21 
     22 #include <features.h>
     23 #include <sys/types.h>
     24 
     25 #include <netinet/in.h>
     26 
     27 __BEGIN_DECLS
     28 
     29 struct timestamp
     30   {
     31     u_int8_t len;
     32     u_int8_t ptr;
     33 #if __BYTE_ORDER == __LITTLE_ENDIAN
     34     unsigned int flags:4;
     35     unsigned int overflow:4;
     36 #elif __BYTE_ORDER == __BIG_ENDIAN
     37     unsigned int overflow:4;
     38     unsigned int flags:4;
     39 #else
     40 # error	"Please fix <bits/endian.h>"
     41 #endif
     42     u_int32_t data[9];
     43   };
     44 
     45 struct iphdr
     46   {
     47 #if __BYTE_ORDER == __LITTLE_ENDIAN
     48     unsigned int ihl:4;
     49     unsigned int version:4;
     50 #elif __BYTE_ORDER == __BIG_ENDIAN
     51     unsigned int version:4;
     52     unsigned int ihl:4;
     53 #else
     54 # error	"Please fix <bits/endian.h>"
     55 #endif
     56     u_int8_t tos;
     57     u_int16_t tot_len;
     58     u_int16_t id;
     59     u_int16_t frag_off;
     60     u_int8_t ttl;
     61     u_int8_t protocol;
     62     u_int16_t check;
     63     u_int32_t saddr;
     64     u_int32_t daddr;
     65     /*The options start here. */
     66   };
     67 
     68 #ifdef __USE_BSD
     69 /*
     70  * Copyright (c) 1982, 1986, 1993
     71  *	The Regents of the University of California.  All rights reserved.
     72  *
     73  * Redistribution and use in source and binary forms, with or without
     74  * modification, are permitted provided that the following conditions
     75  * are met:
     76  * 1. Redistributions of source code must retain the above copyright
     77  *    notice, this list of conditions and the following disclaimer.
     78  * 2. Redistributions in binary form must reproduce the above copyright
     79  *    notice, this list of conditions and the following disclaimer in the
     80  *    documentation and/or other materials provided with the distribution.
     81  * 4. Neither the name of the University nor the names of its contributors
     82  *    may be used to endorse or promote products derived from this software
     83  *    without specific prior written permission.
     84  *
     85  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     86  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     87  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     88  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     89  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     90  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     91  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     92  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     93  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     94  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     95  * SUCH DAMAGE.
     96  *
     97  *	@(#)ip.h	8.1 (Berkeley) 6/10/93
     98  */
     99 
    100 /*
    101  * Definitions for internet protocol version 4.
    102  * Per RFC 791, September 1981.
    103  */
    104 
    105 /*
    106  * Structure of an internet header, naked of options.
    107  */
    108 struct ip
    109   {
    110 #if __BYTE_ORDER == __LITTLE_ENDIAN
    111     unsigned int ip_hl:4;		/* header length */
    112     unsigned int ip_v:4;		/* version */
    113 #endif
    114 #if __BYTE_ORDER == __BIG_ENDIAN
    115     unsigned int ip_v:4;		/* version */
    116     unsigned int ip_hl:4;		/* header length */
    117 #endif
    118     u_int8_t ip_tos;			/* type of service */
    119     u_short ip_len;			/* total length */
    120     u_short ip_id;			/* identification */
    121     u_short ip_off;			/* fragment offset field */
    122 #define	IP_RF 0x8000			/* reserved fragment flag */
    123 #define	IP_DF 0x4000			/* dont fragment flag */
    124 #define	IP_MF 0x2000			/* more fragments flag */
    125 #define	IP_OFFMASK 0x1fff		/* mask for fragmenting bits */
    126     u_int8_t ip_ttl;			/* time to live */
    127     u_int8_t ip_p;			/* protocol */
    128     u_short ip_sum;			/* checksum */
    129     struct in_addr ip_src, ip_dst;	/* source and dest address */
    130   };
    131 
    132 /*
    133  * Time stamp option structure.
    134  */
    135 struct ip_timestamp
    136   {
    137     u_int8_t ipt_code;			/* IPOPT_TS */
    138     u_int8_t ipt_len;			/* size of structure (variable) */
    139     u_int8_t ipt_ptr;			/* index of current entry */
    140 #if __BYTE_ORDER == __LITTLE_ENDIAN
    141     unsigned int ipt_flg:4;		/* flags, see below */
    142     unsigned int ipt_oflw:4;		/* overflow counter */
    143 #endif
    144 #if __BYTE_ORDER == __BIG_ENDIAN
    145     unsigned int ipt_oflw:4;		/* overflow counter */
    146     unsigned int ipt_flg:4;		/* flags, see below */
    147 #endif
    148     u_int32_t data[9];
    149   };
    150 #endif /* __USE_BSD */
    151 
    152 #define	IPVERSION	4               /* IP version number */
    153 #define	IP_MAXPACKET	65535		/* maximum packet size */
    154 
    155 /*
    156  * Definitions for IP type of service (ip_tos)
    157  */
    158 #define	IPTOS_TOS_MASK		0x1E
    159 #define	IPTOS_TOS(tos)		((tos) & IPTOS_TOS_MASK)
    160 #define	IPTOS_LOWDELAY		0x10
    161 #define	IPTOS_THROUGHPUT	0x08
    162 #define	IPTOS_RELIABILITY	0x04
    163 #define	IPTOS_LOWCOST		0x02
    164 #define	IPTOS_MINCOST		IPTOS_LOWCOST
    165 
    166 /*
    167  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
    168  */
    169 #define	IPTOS_PREC_MASK			0xe0
    170 #define	IPTOS_PREC(tos)                ((tos) & IPTOS_PREC_MASK)
    171 #define	IPTOS_PREC_NETCONTROL		0xe0
    172 #define	IPTOS_PREC_INTERNETCONTROL	0xc0
    173 #define	IPTOS_PREC_CRITIC_ECP		0xa0
    174 #define	IPTOS_PREC_FLASHOVERRIDE	0x80
    175 #define	IPTOS_PREC_FLASH		0x60
    176 #define	IPTOS_PREC_IMMEDIATE		0x40
    177 #define	IPTOS_PREC_PRIORITY		0x20
    178 #define	IPTOS_PREC_ROUTINE		0x00
    179 
    180 /*
    181  * Definitions for options.
    182  */
    183 #define	IPOPT_COPY		0x80
    184 #define	IPOPT_CLASS_MASK	0x60
    185 #define	IPOPT_NUMBER_MASK	0x1f
    186 
    187 #define	IPOPT_COPIED(o)		((o) & IPOPT_COPY)
    188 #define	IPOPT_CLASS(o)		((o) & IPOPT_CLASS_MASK)
    189 #define	IPOPT_NUMBER(o)		((o) & IPOPT_NUMBER_MASK)
    190 
    191 #define	IPOPT_CONTROL		0x00
    192 #define	IPOPT_RESERVED1		0x20
    193 #define	IPOPT_DEBMEAS		0x40
    194 #define	IPOPT_MEASUREMENT       IPOPT_DEBMEAS
    195 #define	IPOPT_RESERVED2		0x60
    196 
    197 #define	IPOPT_EOL		0		/* end of option list */
    198 #define	IPOPT_END		IPOPT_EOL
    199 #define	IPOPT_NOP		1		/* no operation */
    200 #define	IPOPT_NOOP		IPOPT_NOP
    201 
    202 #define	IPOPT_RR		7		/* record packet route */
    203 #define	IPOPT_TS		68		/* timestamp */
    204 #define	IPOPT_TIMESTAMP		IPOPT_TS
    205 #define	IPOPT_SECURITY		130		/* provide s,c,h,tcc */
    206 #define	IPOPT_SEC		IPOPT_SECURITY
    207 #define	IPOPT_LSRR		131		/* loose source route */
    208 #define	IPOPT_SATID		136		/* satnet id */
    209 #define	IPOPT_SID		IPOPT_SATID
    210 #define	IPOPT_SSRR		137		/* strict source route */
    211 #define	IPOPT_RA		148		/* router alert */
    212 
    213 /*
    214  * Offsets to fields in options other than EOL and NOP.
    215  */
    216 #define	IPOPT_OPTVAL		0		/* option ID */
    217 #define	IPOPT_OLEN		1		/* option length */
    218 #define	IPOPT_OFFSET		2		/* offset within option */
    219 #define	IPOPT_MINOFF		4		/* min value of above */
    220 
    221 #define	MAX_IPOPTLEN		40
    222 
    223 /* flag bits for ipt_flg */
    224 #define	IPOPT_TS_TSONLY		0		/* timestamps only */
    225 #define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */
    226 #define	IPOPT_TS_PRESPEC	3		/* specified modules only */
    227 
    228 /* bits for security (not byte swapped) */
    229 #define	IPOPT_SECUR_UNCLASS	0x0000
    230 #define	IPOPT_SECUR_CONFID	0xf135
    231 #define	IPOPT_SECUR_EFTO	0x789a
    232 #define	IPOPT_SECUR_MMMM	0xbc4d
    233 #define	IPOPT_SECUR_RESTR	0xaf13
    234 #define	IPOPT_SECUR_SECRET	0xd788
    235 #define	IPOPT_SECUR_TOPSECRET	0x6bc5
    236 
    237 /*
    238  * Internet implementation parameters.
    239  */
    240 #define	MAXTTL		255		/* maximum time to live (seconds) */
    241 #define	IPDEFTTL	64		/* default ttl, from RFC 1340 */
    242 #define	IPFRAGTTL	60		/* time to live for frags, slowhz */
    243 #define	IPTTLDEC	1		/* subtracted when forwarding */
    244 
    245 #define	IP_MSS		576		/* default maximum segment size */
    246 
    247 __END_DECLS
    248 
    249 #endif /* netinet/ip.h */
    250