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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)ip.h        8.2 (Berkeley) 6/1/94
   30  * $FreeBSD: releng/5.4/sys/netinet/ip.h 145335 2005-04-20 19:11:07Z cvs2svn $
   31  */
   32 
   33 #ifndef _NETINET_IP_H_
   34 #define _NETINET_IP_H_
   35 
   36 #include <sys/cdefs.h>
   37 
   38 /*
   39  * Definitions for internet protocol version 4.
   40  * Per RFC 791, September 1981.
   41  */
   42 #define IPVERSION       4
   43 
   44 /*
   45  * Structure of an internet header, naked of options.
   46  */
   47 struct ip {
   48 #if BYTE_ORDER == LITTLE_ENDIAN
   49         u_int   ip_hl:4,                /* header length */
   50                 ip_v:4;                 /* version */
   51 #endif
   52 #if BYTE_ORDER == BIG_ENDIAN
   53         u_int   ip_v:4,                 /* version */
   54                 ip_hl:4;                /* header length */
   55 #endif
   56         u_char  ip_tos;                 /* type of service */
   57         u_short ip_len;                 /* total length */
   58         u_short ip_id;                  /* identification */
   59         u_short ip_off;                 /* fragment offset field */
   60 #define IP_RF 0x8000                    /* reserved fragment flag */
   61 #define IP_DF 0x4000                    /* dont fragment flag */
   62 #define IP_MF 0x2000                    /* more fragments flag */
   63 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
   64         u_char  ip_ttl;                 /* time to live */
   65         u_char  ip_p;                   /* protocol */
   66         u_short ip_sum;                 /* checksum */
   67         struct  in_addr ip_src,ip_dst;  /* source and dest address */
   68 } __packed;
   69 
   70 #ifdef CTASSERT
   71 CTASSERT(sizeof (struct ip) == 20);
   72 #endif
   73 
   74 #define IP_MAXPACKET    65535           /* maximum packet size */
   75 
   76 /*
   77  * Definitions for IP type of service (ip_tos)
   78  */
   79 #define IPTOS_LOWDELAY          0x10
   80 #define IPTOS_THROUGHPUT        0x08
   81 #define IPTOS_RELIABILITY       0x04
   82 #define IPTOS_MINCOST           0x02
   83 #if 1
   84 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
   85 #define IPTOS_CE                0x01
   86 #define IPTOS_ECT               0x02
   87 #endif
   88 
   89 /*
   90  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
   91  */
   92 #define IPTOS_PREC_NETCONTROL           0xe0
   93 #define IPTOS_PREC_INTERNETCONTROL      0xc0
   94 #define IPTOS_PREC_CRITIC_ECP           0xa0
   95 #define IPTOS_PREC_FLASHOVERRIDE        0x80
   96 #define IPTOS_PREC_FLASH                0x60
   97 #define IPTOS_PREC_IMMEDIATE            0x40
   98 #define IPTOS_PREC_PRIORITY             0x20
   99 #define IPTOS_PREC_ROUTINE              0x00
  100 
  101 /*
  102  * ECN (Explicit Congestion Notification) codepoints in RFC3168
  103  * mapped to the lower 2 bits of the TOS field.
  104  */
  105 #define IPTOS_ECN_NOTECT        0x00    /* not-ECT */
  106 #define IPTOS_ECN_ECT1          0x01    /* ECN-capable transport (1) */
  107 #define IPTOS_ECN_ECT0          0x02    /* ECN-capable transport (0) */
  108 #define IPTOS_ECN_CE            0x03    /* congestion experienced */
  109 #define IPTOS_ECN_MASK          0x03    /* ECN field mask */
  110 
  111 /*
  112  * Definitions for options.
  113  */
  114 #define IPOPT_COPIED(o)         ((o)&0x80)
  115 #define IPOPT_CLASS(o)          ((o)&0x60)
  116 #define IPOPT_NUMBER(o)         ((o)&0x1f)
  117 
  118 #define IPOPT_CONTROL           0x00
  119 #define IPOPT_RESERVED1         0x20
  120 #define IPOPT_DEBMEAS           0x40
  121 #define IPOPT_RESERVED2         0x60
  122 
  123 #define IPOPT_EOL               0               /* end of option list */
  124 #define IPOPT_NOP               1               /* no operation */
  125 
  126 #define IPOPT_RR                7               /* record packet route */
  127 #define IPOPT_TS                68              /* timestamp */
  128 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
  129 #define IPOPT_LSRR              131             /* loose source route */
  130 #define IPOPT_ESO               133             /* extended security */
  131 #define IPOPT_CIPSO             134             /* commerical security */
  132 #define IPOPT_SATID             136             /* satnet id */
  133 #define IPOPT_SSRR              137             /* strict source route */
  134 #define IPOPT_RA                148             /* router alert */
  135 
  136 /*
  137  * Offsets to fields in options other than EOL and NOP.
  138  */
  139 #define IPOPT_OPTVAL            0               /* option ID */
  140 #define IPOPT_OLEN              1               /* option length */
  141 #define IPOPT_OFFSET            2               /* offset within option */
  142 #define IPOPT_MINOFF            4               /* min value of above */
  143 
  144 /*
  145  * Time stamp option structure.
  146  */
  147 struct  ip_timestamp {
  148         u_char  ipt_code;               /* IPOPT_TS */
  149         u_char  ipt_len;                /* size of structure (variable) */
  150         u_char  ipt_ptr;                /* index of current entry */
  151 #if BYTE_ORDER == LITTLE_ENDIAN
  152         u_int   ipt_flg:4,              /* flags, see below */
  153                 ipt_oflw:4;             /* overflow counter */
  154 #endif
  155 #if BYTE_ORDER == BIG_ENDIAN
  156         u_int   ipt_oflw:4,             /* overflow counter */
  157                 ipt_flg:4;              /* flags, see below */
  158 #endif
  159         union ipt_timestamp {
  160                 n_long  ipt_time[1];
  161                 struct  ipt_ta {
  162                         struct in_addr ipt_addr;
  163                         n_long ipt_time;
  164                 } ipt_ta[1];
  165         } ipt_timestamp;
  166 };
  167 
  168 /* flag bits for ipt_flg */
  169 #define IPOPT_TS_TSONLY         0               /* timestamps only */
  170 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
  171 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
  172 
  173 /* bits for security (not byte swapped) */
  174 #define IPOPT_SECUR_UNCLASS     0x0000
  175 #define IPOPT_SECUR_CONFID      0xf135
  176 #define IPOPT_SECUR_EFTO        0x789a
  177 #define IPOPT_SECUR_MMMM        0xbc4d
  178 #define IPOPT_SECUR_RESTR       0xaf13
  179 #define IPOPT_SECUR_SECRET      0xd788
  180 #define IPOPT_SECUR_TOPSECRET   0x6bc5
  181 
  182 /*
  183  * Internet implementation parameters.
  184  */
  185 #define MAXTTL          255             /* maximum time to live (seconds) */
  186 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
  187 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
  188 #define IPTTLDEC        1               /* subtracted when forwarding */
  189 
  190 #define IP_MSS          576             /* default maximum segment size */
  191 
  192 /*
  193  * This is the real IPv4 pseudo header, used for computing the TCP and UDP
  194  * checksums. For the Internet checksum, struct ipovly can be used instead.
  195  * For stronger checksums, the real thing must be used.
  196  */
  197 struct ippseudo {
  198         struct  in_addr ippseudo_src;   /* source internet address */
  199         struct  in_addr ippseudo_dst;   /* destination internet address */
  200         u_char          ippseudo_pad;   /* pad, must be zero */
  201         u_char          ippseudo_p;     /* protocol */
  202         u_short         ippseudo_len;   /* protocol length */
  203 };
  204 #endif

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