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  * $FreeBSD$
   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 /* ECN bits proposed by Sally Floyd */
   93 #define IPTOS_CE                0x01    /* congestion experienced */
   94 #define IPTOS_ECT               0x02    /* ECN-capable transport */
   95 
   96 
   97 /*
   98  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
   99  */
  100 #define IPTOS_PREC_NETCONTROL           0xe0
  101 #define IPTOS_PREC_INTERNETCONTROL      0xc0
  102 #define IPTOS_PREC_CRITIC_ECP           0xa0
  103 #define IPTOS_PREC_FLASHOVERRIDE        0x80
  104 #define IPTOS_PREC_FLASH                0x60
  105 #define IPTOS_PREC_IMMEDIATE            0x40
  106 #define IPTOS_PREC_PRIORITY             0x20
  107 #define IPTOS_PREC_ROUTINE              0x00
  108 
  109 /*
  110  * Definitions for options.
  111  */
  112 #define IPOPT_COPIED(o)         ((o)&0x80)
  113 #define IPOPT_CLASS(o)          ((o)&0x60)
  114 #define IPOPT_NUMBER(o)         ((o)&0x1f)
  115 
  116 #define IPOPT_CONTROL           0x00
  117 #define IPOPT_RESERVED1         0x20
  118 #define IPOPT_DEBMEAS           0x40
  119 #define IPOPT_RESERVED2         0x60
  120 
  121 #define IPOPT_EOL               0               /* end of option list */
  122 #define IPOPT_NOP               1               /* no operation */
  123 
  124 #define IPOPT_RR                7               /* record packet route */
  125 #define IPOPT_TS                68              /* timestamp */
  126 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
  127 #define IPOPT_LSRR              131             /* loose source route */
  128 #define IPOPT_SATID             136             /* satnet id */
  129 #define IPOPT_SSRR              137             /* strict source route */
  130 #define IPOPT_RA                148             /* router alert */
  131 
  132 /*
  133  * Offsets to fields in options other than EOL and NOP.
  134  */
  135 #define IPOPT_OPTVAL            0               /* option ID */
  136 #define IPOPT_OLEN              1               /* option length */
  137 #define IPOPT_OFFSET            2               /* offset within option */
  138 #define IPOPT_MINOFF            4               /* min value of above */
  139 
  140 /*
  141  * Time stamp option structure.
  142  */
  143 struct  ip_timestamp {
  144         u_char  ipt_code;               /* IPOPT_TS */
  145         u_char  ipt_len;                /* size of structure (variable) */
  146         u_char  ipt_ptr;                /* index of current entry */
  147 #if BYTE_ORDER == LITTLE_ENDIAN
  148         u_int   ipt_flg:4,              /* flags, see below */
  149                 ipt_oflw:4;             /* overflow counter */
  150 #endif
  151 #if BYTE_ORDER == BIG_ENDIAN
  152         u_int   ipt_oflw:4,             /* overflow counter */
  153                 ipt_flg:4;              /* flags, see below */
  154 #endif
  155         union ipt_timestamp {
  156                 n_long  ipt_time[1];
  157                 struct  ipt_ta {
  158                         struct in_addr ipt_addr;
  159                         n_long ipt_time;
  160                 } ipt_ta[1];
  161         } ipt_timestamp;
  162 };
  163 
  164 /* flag bits for ipt_flg */
  165 #define IPOPT_TS_TSONLY         0               /* timestamps only */
  166 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
  167 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
  168 
  169 /* bits for security (not byte swapped) */
  170 #define IPOPT_SECUR_UNCLASS     0x0000
  171 #define IPOPT_SECUR_CONFID      0xf135
  172 #define IPOPT_SECUR_EFTO        0x789a
  173 #define IPOPT_SECUR_MMMM        0xbc4d
  174 #define IPOPT_SECUR_RESTR       0xaf13
  175 #define IPOPT_SECUR_SECRET      0xd788
  176 #define IPOPT_SECUR_TOPSECRET   0x6bc5
  177 
  178 /*
  179  * Internet implementation parameters.
  180  */
  181 #define MAXTTL          255             /* maximum time to live (seconds) */
  182 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
  183 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
  184 #define IPTTLDEC        1               /* subtracted when forwarding */
  185 
  186 #define IP_MSS          576             /* default maximum segment size */
  187 
  188 /*
  189  * This is the real IPv4 pseudo header, used for computing the TCP and UDP
  190  * checksums. For the Internet checksum, struct ipovly can be used instead.
  191  * For stronger checksums, the real thing must be used.
  192  */
  193 struct ippseudo {
  194         struct  in_addr ippseudo_src;   /* source internet address */
  195         struct  in_addr ippseudo_dst;   /* destination internet address */
  196         u_char          ippseudo_pad;   /* pad, must be zero */
  197         u_char          ippseudo_p;     /* protocol */
  198         u_short         ippseudo_len;   /* protocol length */
  199 };
  200 #endif

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