The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/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: releng/5.2/sys/netinet/ip.h 121684 2003-10-29 15:07:04Z ume $
   35  */
   36 
   37 #ifndef _NETINET_IP_H_
   38 #define _NETINET_IP_H_
   39 
   40 #include <sys/cdefs.h>
   41 
   42 /*
   43  * Definitions for internet protocol version 4.
   44  * Per RFC 791, September 1981.
   45  */
   46 #define IPVERSION       4
   47 
   48 /*
   49  * Structure of an internet header, naked of options.
   50  */
   51 struct ip {
   52 #if BYTE_ORDER == LITTLE_ENDIAN
   53         u_int   ip_hl:4,                /* header length */
   54                 ip_v:4;                 /* version */
   55 #endif
   56 #if BYTE_ORDER == BIG_ENDIAN
   57         u_int   ip_v:4,                 /* version */
   58                 ip_hl:4;                /* header length */
   59 #endif
   60         u_char  ip_tos;                 /* type of service */
   61         u_short ip_len;                 /* total length */
   62         u_short ip_id;                  /* identification */
   63         u_short ip_off;                 /* fragment offset field */
   64 #define IP_RF 0x8000                    /* reserved fragment flag */
   65 #define IP_DF 0x4000                    /* dont fragment flag */
   66 #define IP_MF 0x2000                    /* more fragments flag */
   67 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
   68         u_char  ip_ttl;                 /* time to live */
   69         u_char  ip_p;                   /* protocol */
   70         u_short ip_sum;                 /* checksum */
   71         struct  in_addr ip_src,ip_dst;  /* source and dest address */
   72 } __packed;
   73 
   74 #ifdef CTASSERT
   75 CTASSERT(sizeof (struct ip) == 20);
   76 #endif
   77 
   78 #define IP_MAXPACKET    65535           /* maximum packet size */
   79 
   80 /*
   81  * Definitions for IP type of service (ip_tos)
   82  */
   83 #define IPTOS_LOWDELAY          0x10
   84 #define IPTOS_THROUGHPUT        0x08
   85 #define IPTOS_RELIABILITY       0x04
   86 #define IPTOS_MINCOST           0x02
   87 #if 1
   88 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
   89 #define IPTOS_CE                0x01
   90 #define IPTOS_ECT               0x02
   91 #endif
   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  * ECN (Explicit Congestion Notification) codepoints in RFC3168
  107  * mapped to the lower 2 bits of the TOS field.
  108  */
  109 #define IPTOS_ECN_NOTECT        0x00    /* not-ECT */
  110 #define IPTOS_ECN_ECT1          0x01    /* ECN-capable transport (1) */
  111 #define IPTOS_ECN_ECT0          0x02    /* ECN-capable transport (0) */
  112 #define IPTOS_ECN_CE            0x03    /* congestion experienced */
  113 #define IPTOS_ECN_MASK          0x03    /* ECN field mask */
  114 
  115 /*
  116  * Definitions for options.
  117  */
  118 #define IPOPT_COPIED(o)         ((o)&0x80)
  119 #define IPOPT_CLASS(o)          ((o)&0x60)
  120 #define IPOPT_NUMBER(o)         ((o)&0x1f)
  121 
  122 #define IPOPT_CONTROL           0x00
  123 #define IPOPT_RESERVED1         0x20
  124 #define IPOPT_DEBMEAS           0x40
  125 #define IPOPT_RESERVED2         0x60
  126 
  127 #define IPOPT_EOL               0               /* end of option list */
  128 #define IPOPT_NOP               1               /* no operation */
  129 
  130 #define IPOPT_RR                7               /* record packet route */
  131 #define IPOPT_TS                68              /* timestamp */
  132 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
  133 #define IPOPT_LSRR              131             /* loose source route */
  134 #define IPOPT_ESO               133             /* extended security */
  135 #define IPOPT_CIPSO             134             /* commerical security */
  136 #define IPOPT_SATID             136             /* satnet id */
  137 #define IPOPT_SSRR              137             /* strict source route */
  138 #define IPOPT_RA                148             /* router alert */
  139 
  140 /*
  141  * Offsets to fields in options other than EOL and NOP.
  142  */
  143 #define IPOPT_OPTVAL            0               /* option ID */
  144 #define IPOPT_OLEN              1               /* option length */
  145 #define IPOPT_OFFSET            2               /* offset within option */
  146 #define IPOPT_MINOFF            4               /* min value of above */
  147 
  148 /*
  149  * Time stamp option structure.
  150  */
  151 struct  ip_timestamp {
  152         u_char  ipt_code;               /* IPOPT_TS */
  153         u_char  ipt_len;                /* size of structure (variable) */
  154         u_char  ipt_ptr;                /* index of current entry */
  155 #if BYTE_ORDER == LITTLE_ENDIAN
  156         u_int   ipt_flg:4,              /* flags, see below */
  157                 ipt_oflw:4;             /* overflow counter */
  158 #endif
  159 #if BYTE_ORDER == BIG_ENDIAN
  160         u_int   ipt_oflw:4,             /* overflow counter */
  161                 ipt_flg:4;              /* flags, see below */
  162 #endif
  163         union ipt_timestamp {
  164                 n_long  ipt_time[1];
  165                 struct  ipt_ta {
  166                         struct in_addr ipt_addr;
  167                         n_long ipt_time;
  168                 } ipt_ta[1];
  169         } ipt_timestamp;
  170 };
  171 
  172 /* flag bits for ipt_flg */
  173 #define IPOPT_TS_TSONLY         0               /* timestamps only */
  174 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
  175 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
  176 
  177 /* bits for security (not byte swapped) */
  178 #define IPOPT_SECUR_UNCLASS     0x0000
  179 #define IPOPT_SECUR_CONFID      0xf135
  180 #define IPOPT_SECUR_EFTO        0x789a
  181 #define IPOPT_SECUR_MMMM        0xbc4d
  182 #define IPOPT_SECUR_RESTR       0xaf13
  183 #define IPOPT_SECUR_SECRET      0xd788
  184 #define IPOPT_SECUR_TOPSECRET   0x6bc5
  185 
  186 /*
  187  * Internet implementation parameters.
  188  */
  189 #define MAXTTL          255             /* maximum time to live (seconds) */
  190 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
  191 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
  192 #define IPTTLDEC        1               /* subtracted when forwarding */
  193 
  194 #define IP_MSS          576             /* default maximum segment size */
  195 
  196 #endif

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