includes/netinet/ip.h

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00001 /*      $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $       */
00002 
00003 /*
00004  * Copyright (c) 1982, 1986, 1993
00005  *      The Regents of the University of California.  All rights reserved.
00006  *
00007  * Redistribution and use in source and binary forms, with or without
00008  * modification, are permitted provided that the following conditions
00009  * are met:
00010  * 1. Redistributions of source code must retain the above copyright
00011  *    notice, this list of conditions and the following disclaimer.
00012  * 2. Redistributions in binary form must reproduce the above copyright
00013  *    notice, this list of conditions and the following disclaimer in the
00014  *    documentation and/or other materials provided with the distribution.
00015  * 3. Neither the name of the University nor the names of its contributors
00016  *    may be used to endorse or promote products derived from this software
00017  *    without specific prior written permission.
00018  *
00019  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00020  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00021  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00022  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00023  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00024  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00025  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00026  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00027  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00028  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00029  * SUCH DAMAGE.
00030  *
00031  *      @(#)ip.h        8.1 (Berkeley) 6/10/93
00032  */
00033 
00034 /*
00035  * Definitions for internet protocol version 4.
00036  * Per RFC 791, September 1981.
00037  */
00038 #define IPVERSION       4
00039 
00040 /*
00041  * Structure of an internet header, naked of options.
00042  *
00043  * We declare ip_len and ip_off to be short, rather than u_short
00044  * pragmatically since otherwise unsigned comparisons can result
00045  * against negative integers quite easily, and fail in subtle ways.
00046  */
00047 struct ip {
00048         u_int8_t  ip_fvhl;              /* header length, version */
00049         u_int8_t  ip_tos;               /* type of service */
00050         int16_t   ip_len;               /* total length */
00051         u_int16_t ip_id;                /* identification */
00052         int16_t   ip_off;               /* fragment offset field */
00053 #define IP_DF 0x4000                    /* dont fragment flag */
00054 #define IP_MF 0x2000                    /* more fragments flag */
00055 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
00056         u_int8_t  ip_ttl;               /* time to live */
00057         u_int8_t  ip_p;                 /* protocol */
00058         u_int16_t ip_sum;               /* checksum */
00059         struct    in_addr ip_src, ip_dst; /* source and dest address */
00060 };
00061 
00062 #define IP_V(iph)       ((iph)->ip_fvhl >> 4)
00063 #define IP_HL(iph)      (((iph)->ip_fvhl & 0x0F) << 2)
00064 #define IP_V_SET(iph,x) ((iph)->ip_fvhl = ((iph)->ip_fvhl & 0x0F) | ((x) << 4))
00065 #define IP_HL_SET(iph,x) ((iph)->ip_fvhl = \
00066                           ((iph)->ip_fvhl & 0xF0) | (((x) >> 2) & 0x0F))
00067 
00068 #define IP_MAXPACKET    65535           /* maximum packet size */
00069 
00070 /*
00071  * Definitions for IP type of service (ip_tos)
00072  */
00073 #define IPTOS_LOWDELAY          0x10
00074 #define IPTOS_THROUGHPUT        0x08
00075 #define IPTOS_RELIABILITY       0x04
00076 /*      IPTOS_LOWCOST           0x02 XXX */
00077 
00078 /*
00079  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
00080  */
00081 #define IPTOS_PREC_NETCONTROL           0xe0
00082 #define IPTOS_PREC_INTERNETCONTROL      0xc0
00083 #define IPTOS_PREC_CRITIC_ECP           0xa0
00084 #define IPTOS_PREC_FLASHOVERRIDE        0x80
00085 #define IPTOS_PREC_FLASH                0x60
00086 #define IPTOS_PREC_IMMEDIATE            0x40
00087 #define IPTOS_PREC_PRIORITY             0x20
00088 #define IPTOS_PREC_ROUTINE              0x00
00089 
00090 /*
00091  * Definitions for options.
00092  */
00093 #define IPOPT_COPIED(o)         ((o)&0x80)
00094 #define IPOPT_CLASS(o)          ((o)&0x60)
00095 #define IPOPT_NUMBER(o)         ((o)&0x1f)
00096 
00097 #define IPOPT_CONTROL           0x00
00098 #define IPOPT_RESERVED1         0x20
00099 #define IPOPT_DEBMEAS           0x40
00100 #define IPOPT_RESERVED2         0x60
00101 
00102 #define IPOPT_EOL               0               /* end of option list */
00103 #define IPOPT_NOP               1               /* no operation */
00104 
00105 #define IPOPT_RR                7               /* record packet route */
00106 #define IPOPT_TS                68              /* timestamp */
00107 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
00108 #define IPOPT_LSRR              131             /* loose source route */
00109 #define IPOPT_SATID             136             /* satnet id */
00110 #define IPOPT_SSRR              137             /* strict source route */
00111 
00112 /*
00113  * Offsets to fields in options other than EOL and NOP.
00114  */
00115 #define IPOPT_OPTVAL            0               /* option ID */
00116 #define IPOPT_OLEN              1               /* option length */
00117 #define IPOPT_OFFSET            2               /* offset within option */
00118 #define IPOPT_MINOFF            4               /* min value of above */
00119 
00120 /*
00121  * Time stamp option structure.
00122  */
00123 struct  ip_timestamp {
00124         u_int8_t ipt_code;              /* IPOPT_TS */
00125         u_int8_t ipt_len;               /* size of structure (variable) */
00126         u_int8_t ipt_ptr;               /* index of current entry */
00127         u_int8_t ipt_flg_oflw;          /* flags, see below, overflow counter */
00128         union ipt_timestamp {
00129                  u_int32_t ipt_time[1];
00130                  struct ipt_ta {
00131                         struct in_addr ipt_addr;
00132                         u_int32_t ipt_time;
00133                  } ipt_ta[1];
00134         } ipt_timestamp;
00135 };
00136 
00137 /* flag bits for ipt_flg */
00138 #define IPOPT_TS_TSONLY         0               /* timestamps only */
00139 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
00140 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
00141 
00142 /* bits for security (not byte swapped) */
00143 #define IPOPT_SECUR_UNCLASS     0x0000
00144 #define IPOPT_SECUR_CONFID      0xf135
00145 #define IPOPT_SECUR_EFTO        0x789a
00146 #define IPOPT_SECUR_MMMM        0xbc4d
00147 #define IPOPT_SECUR_RESTR       0xaf13
00148 #define IPOPT_SECUR_SECRET      0xd788
00149 #define IPOPT_SECUR_TOPSECRET   0x6bc5
00150 
00151 /*
00152  * Internet implementation parameters.
00153  */
00154 #define MAXTTL          255             /* maximum time to live (seconds) */
00155 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
00156 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
00157 #define IPTTLDEC        1               /* subtracted when forwarding */
00158 
00159 #define IP_MSS          576             /* default maximum segment size */

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