ip.h

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    1 /*
    2  * Copyright (c) 1982, 1986, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)ip.h        8.2 (Berkeley) 6/1/94
   34  * $FreeBSD$
   35  */
   36 
   37 #ifndef _NETINET_IP_H_
   38 #define _NETINET_IP_H_
   39 
   40 /*
   41  * Definitions for internet protocol version 4.
   42  * Per RFC 791, September 1981.
   43  */
   44 #define IPVERSION       4
   45 
   46 /*
   47  * Structure of an internet header, naked of options.
   48  */
   49 struct ip {
   50 #ifdef _IP_VHL
   51         u_char  ip_vhl;                 /* version << 4 | header length >> 2 */
   52 #else
   53 #if BYTE_ORDER == LITTLE_ENDIAN
   54         u_int   ip_hl:4,                /* header length */
   55                 ip_v:4;                 /* version */
   56 #endif
   57 #if BYTE_ORDER == BIG_ENDIAN
   58         u_int   ip_v:4,                 /* version */
   59                 ip_hl:4;                /* header length */
   60 #endif
   61 #endif /* not _IP_VHL */
   62         u_char  ip_tos;                 /* type of service */
   63         u_short ip_len;                 /* total length */
   64         u_short ip_id;                  /* identification */
   65         u_short ip_off;                 /* fragment offset field */
   66 #define IP_RF 0x8000                    /* reserved fragment flag */
   67 #define IP_DF 0x4000                    /* dont fragment flag */
   68 #define IP_MF 0x2000                    /* more fragments flag */
   69 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
   70         u_char  ip_ttl;                 /* time to live */
   71         u_char  ip_p;                   /* protocol */
   72         u_short ip_sum;                 /* checksum */
   73         struct  in_addr ip_src,ip_dst;  /* source and dest address */
   74 };
   75 
   76 #ifdef _IP_VHL
   77 #define IP_MAKE_VHL(v, hl)      ((v) << 4 | (hl))
   78 #define IP_VHL_HL(vhl)          ((vhl) & 0x0f)
   79 #define IP_VHL_V(vhl)           ((vhl) >> 4)
   80 #define IP_VHL_BORING           0x45
   81 #endif
   82 
   83 #define IP_MAXPACKET    65535           /* maximum packet size */
   84 
   85 /*
   86  * Definitions for IP type of service (ip_tos)
   87  */
   88 #define IPTOS_LOWDELAY          0x10
   89 #define IPTOS_THROUGHPUT        0x08
   90 #define IPTOS_RELIABILITY       0x04
   91 #define IPTOS_MINCOST           0x02
   92 
   93 /*
   94  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
   95  */
   96 #define IPTOS_PREC_NETCONTROL           0xe0
   97 #define IPTOS_PREC_INTERNETCONTROL      0xc0
   98 #define IPTOS_PREC_CRITIC_ECP           0xa0
   99 #define IPTOS_PREC_FLASHOVERRIDE        0x80
  100 #define IPTOS_PREC_FLASH                0x60
  101 #define IPTOS_PREC_IMMEDIATE            0x40
  102 #define IPTOS_PREC_PRIORITY             0x20
  103 #define IPTOS_PREC_ROUTINE              0x00
  104 
  105 /*
  106  * Definitions for options.
  107  */
  108 #define IPOPT_COPIED(o)         ((o)&0x80)
  109 #define IPOPT_CLASS(o)          ((o)&0x60)
  110 #define IPOPT_NUMBER(o)         ((o)&0x1f)
  111 
  112 #define IPOPT_CONTROL           0x00
  113 #define IPOPT_RESERVED1         0x20
  114 #define IPOPT_DEBMEAS           0x40
  115 #define IPOPT_RESERVED2         0x60
  116 
  117 #define IPOPT_EOL               0               /* end of option list */
  118 #define IPOPT_NOP               1               /* no operation */
  119 
  120 #define IPOPT_RR                7               /* record packet route */
  121 #define IPOPT_TS                68              /* timestamp */
  122 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
  123 #define IPOPT_LSRR              131             /* loose source route */
  124 #define IPOPT_SATID             136             /* satnet id */
  125 #define IPOPT_SSRR              137             /* strict source route */
  126 #define IPOPT_RA                148             /* router alert */
  127 
  128 /*
  129  * Offsets to fields in options other than EOL and NOP.
  130  */
  131 #define IPOPT_OPTVAL            0               /* option ID */
  132 #define IPOPT_OLEN              1               /* option length */
  133 #define IPOPT_OFFSET            2               /* offset within option */
  134 #define IPOPT_MINOFF            4               /* min value of above */
  135 
  136 /*
  137  * Time stamp option structure.
  138  */
  139 struct  ip_timestamp {
  140         u_char  ipt_code;               /* IPOPT_TS */
  141         u_char  ipt_len;                /* size of structure (variable) */
  142         u_char  ipt_ptr;                /* index of current entry */
  143 #if BYTE_ORDER == LITTLE_ENDIAN
  144         u_int   ipt_flg:4,              /* flags, see below */
  145                 ipt_oflw:4;             /* overflow counter */
  146 #endif
  147 #if BYTE_ORDER == BIG_ENDIAN
  148         u_int   ipt_oflw:4,             /* overflow counter */
  149                 ipt_flg:4;              /* flags, see below */
  150 #endif
  151         union ipt_timestamp {
  152                 n_long  ipt_time[1];
  153                 struct  ipt_ta {
  154                         struct in_addr ipt_addr;
  155                         n_long ipt_time;
  156                 } ipt_ta[1];
  157         } ipt_timestamp;
  158 };
  159 
  160 /* flag bits for ipt_flg */
  161 #define IPOPT_TS_TSONLY         0               /* timestamps only */
  162 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
  163 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
  164 
  165 /* bits for security (not byte swapped) */
  166 #define IPOPT_SECUR_UNCLASS     0x0000
  167 #define IPOPT_SECUR_CONFID      0xf135
  168 #define IPOPT_SECUR_EFTO        0x789a
  169 #define IPOPT_SECUR_MMMM        0xbc4d
  170 #define IPOPT_SECUR_RESTR       0xaf13
  171 #define IPOPT_SECUR_SECRET      0xd788
  172 #define IPOPT_SECUR_TOPSECRET   0x6bc5
  173 
  174 /*
  175  * Internet implementation parameters.
  176  */
  177 #define MAXTTL          255             /* maximum time to live (seconds) */
  178 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
  179 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
  180 #define IPTTLDEC        1               /* subtracted when forwarding */
  181 
  182 #define IP_MSS          576             /* default maximum segment size */
  183 
  184 #endif

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FreeBSD/Linux Kernel Cross Reference sys/netinet/ip.h

FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip.h