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 /*      $NetBSD: ip.h,v 1.26 2004/04/25 22:25:03 jonathan Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)ip.h        8.2 (Berkeley) 6/1/94
   32  */
   33 
   34 #ifndef _NETINET_IP_H_
   35 #define _NETINET_IP_H_
   36 
   37 /*
   38  * Definitions for internet protocol version 4.
   39  * Per RFC 791, September 1981.
   40  */
   41 #define IPVERSION       4
   42 
   43 /*
   44  * Structure of an internet header, naked of options.
   45  */
   46 struct ip {
   47 #if BYTE_ORDER == LITTLE_ENDIAN
   48         u_int8_t  ip_hl:4,              /* header length */
   49                   ip_v:4;               /* version */
   50 #endif
   51 #if BYTE_ORDER == BIG_ENDIAN
   52         u_int8_t  ip_v:4,               /* version */
   53                   ip_hl:4;              /* header length */
   54 #endif
   55         u_int8_t  ip_tos;               /* type of service */
   56         u_int16_t ip_len;               /* total length */
   57         u_int16_t ip_id;                /* identification */
   58         u_int16_t ip_off;               /* fragment offset field */
   59 #define IP_RF 0x8000                    /* reserved fragment flag */
   60 #define IP_EF 0x8000                    /* evil flag, per RFC 3514 */
   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_int8_t  ip_ttl;               /* time to live */
   65         u_int8_t  ip_p;                 /* protocol */
   66         u_int16_t ip_sum;               /* checksum */
   67         struct    in_addr ip_src, ip_dst; /* source and dest address */
   68 } __attribute__((__packed__));
   69 
   70 #define IP_MAXPACKET    65535           /* maximum packet size */
   71 
   72 /*
   73  * Definitions for IP type of service (ip_tos)
   74  */
   75 #define IPTOS_LOWDELAY          0x10
   76 #define IPTOS_THROUGHPUT        0x08
   77 #define IPTOS_RELIABILITY       0x04
   78 /*      IPTOS_LOWCOST           0x02 XXX */
   79 #if 1
   80 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
   81 #define IPTOS_CE                0x01    /* congestion experienced */
   82 #define IPTOS_ECT               0x02    /* ECN-capable transport */
   83 #endif
   84 
   85 /*
   86  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
   87  */
   88 #define IPTOS_PREC_NETCONTROL           0xe0
   89 #define IPTOS_PREC_INTERNETCONTROL      0xc0
   90 #define IPTOS_PREC_CRITIC_ECP           0xa0
   91 #define IPTOS_PREC_FLASHOVERRIDE        0x80
   92 #define IPTOS_PREC_FLASH                0x60
   93 #define IPTOS_PREC_IMMEDIATE            0x40
   94 #define IPTOS_PREC_PRIORITY             0x20
   95 #define IPTOS_PREC_ROUTINE              0x00
   96 
   97 /*
   98  * ECN (Explicit Congestion Notification) codepoints in RFC3168
   99  * mapped to the lower 2 bits of the TOS field.
  100  */
  101 #define IPTOS_ECN_NOTECT        0x00    /* not-ECT */
  102 #define IPTOS_ECN_ECT1          0x01    /* ECN-capable transport (1) */
  103 #define IPTOS_ECN_ECT0          0x02    /* ECN-capable transport (0) */
  104 #define IPTOS_ECN_CE            0x03    /* congestion experienced */
  105 #define IPTOS_ECN_MASK          0x03    /* ECN field mask */
  106 
  107 /*
  108  * Definitions for options.
  109  */
  110 #define IPOPT_COPIED(o)         ((o)&0x80)
  111 #define IPOPT_CLASS(o)          ((o)&0x60)
  112 #define IPOPT_NUMBER(o)         ((o)&0x1f)
  113 
  114 #define IPOPT_CONTROL           0x00
  115 #define IPOPT_RESERVED1         0x20
  116 #define IPOPT_DEBMEAS           0x40
  117 #define IPOPT_RESERVED2         0x60
  118 
  119 #define IPOPT_EOL               0               /* end of option list */
  120 #define IPOPT_NOP               1               /* no operation */
  121 
  122 #define IPOPT_RR                7               /* record packet route */
  123 #define IPOPT_TS                68              /* timestamp */
  124 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
  125 #define IPOPT_LSRR              131             /* loose source route */
  126 #define IPOPT_SATID             136             /* satnet id */
  127 #define IPOPT_SSRR              137             /* strict source route */
  128 
  129 /*
  130  * Offsets to fields in options other than EOL and NOP.
  131  */
  132 #define IPOPT_OPTVAL            0               /* option ID */
  133 #define IPOPT_OLEN              1               /* option length */
  134 #define IPOPT_OFFSET            2               /* offset within option */
  135 #define IPOPT_MINOFF            4               /* min value of above */
  136 
  137 /*
  138  * Time stamp option structure.
  139  */
  140 struct  ip_timestamp {
  141         u_int8_t ipt_code;              /* IPOPT_TS */
  142         u_int8_t ipt_len;               /* size of structure (variable) */
  143         u_int8_t ipt_ptr;               /* index of current entry */
  144 #if BYTE_ORDER == LITTLE_ENDIAN
  145         u_int8_t ipt_flg:4,             /* flags, see below */
  146                  ipt_oflw:4;            /* overflow counter */
  147 #endif
  148 #if BYTE_ORDER == BIG_ENDIAN
  149         u_int8_t ipt_oflw:4,            /* overflow counter */
  150                  ipt_flg:4;             /* flags, see below */
  151 #endif
  152         union ipt_timestamp {
  153                  n_time ipt_time[1];
  154                  struct ipt_ta {
  155                         struct in_addr ipt_addr;
  156                         n_time ipt_time;
  157                  } ipt_ta[1] __attribute__((__packed__));
  158         } ipt_timestamp __attribute__((__packed__));
  159 } __attribute__((__packed__));
  160 
  161 /* flag bits for ipt_flg */
  162 #define IPOPT_TS_TSONLY         0               /* timestamps only */
  163 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
  164 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
  165 
  166 /* bits for security (not byte swapped) */
  167 #define IPOPT_SECUR_UNCLASS     0x0000
  168 #define IPOPT_SECUR_CONFID      0xf135
  169 #define IPOPT_SECUR_EFTO        0x789a
  170 #define IPOPT_SECUR_MMMM        0xbc4d
  171 #define IPOPT_SECUR_RESTR       0xaf13
  172 #define IPOPT_SECUR_SECRET      0xd788
  173 #define IPOPT_SECUR_TOPSECRET   0x6bc5
  174 
  175 /*
  176  * Internet implementation parameters.
  177  */
  178 #define MAXTTL          255             /* maximum time to live (seconds) */
  179 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
  180 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
  181 #define IPTTLDEC        1               /* subtracted when forwarding */
  182 
  183 #define IP_MSS          576             /* default maximum segment size */
  184 
  185 /*
  186  * This is the real IPv4 pseudo header, used for computing the TCP and UDP
  187  * checksums. For the Internet checksum, struct ipovly can be used instead.
  188  * For stronger checksums, the real thing must be used.
  189  */
  190 struct ippseudo {
  191         struct  in_addr ippseudo_src;   /* source internet address */
  192         struct  in_addr ippseudo_dst;   /* destination internet address */
  193         u_int8_t        ippseudo_pad;   /* pad, must be zero */
  194         u_int8_t        ippseudo_p;     /* protocol */
  195         u_int16_t       ippseudo_len;   /* protocol length */
  196 } __packed;
  197 #endif /* _NETINET_IP_H_ */

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