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 /*      $OpenBSD: ip.h,v 1.20 2021/12/14 23:47:36 dtucker Exp $ */
    2 /*      $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $       */
    3 
    4 /*
    5  * Copyright (c) 1982, 1986, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)ip.h        8.1 (Berkeley) 6/10/93
   33  */
   34 
   35 #ifndef _NETINET_IP_H_
   36 #define _NETINET_IP_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_int8_t  ip_tos;               /* type of service */
   57         u_int16_t ip_len;               /* total length */
   58         u_int16_t ip_id;                /* identification */
   59         u_int16_t 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_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 };
   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  * Definitions for DiffServ Codepoints as per RFCs 2474, 3246, 4594 & 8622.
   99  * These are the 6 most significant bits as they appear on the wire, so the
  100  * two least significant bits must be zero.
  101  */
  102 #define IPTOS_DSCP_CS0          0x00
  103 #define IPTOS_DSCP_LE           0x04
  104 #define IPTOS_DSCP_CS1          0x20
  105 #define IPTOS_DSCP_AF11         0x28
  106 #define IPTOS_DSCP_AF12         0x30
  107 #define IPTOS_DSCP_AF13         0x38
  108 #define IPTOS_DSCP_CS2          0x40
  109 #define IPTOS_DSCP_AF21         0x48
  110 #define IPTOS_DSCP_AF22         0x50
  111 #define IPTOS_DSCP_AF23         0x58
  112 #define IPTOS_DSCP_CS3          0x60
  113 #define IPTOS_DSCP_AF31         0x68
  114 #define IPTOS_DSCP_AF32         0x70
  115 #define IPTOS_DSCP_AF33         0x78
  116 #define IPTOS_DSCP_CS4          0x80
  117 #define IPTOS_DSCP_AF41         0x88
  118 #define IPTOS_DSCP_AF42         0x90
  119 #define IPTOS_DSCP_AF43         0x98
  120 #define IPTOS_DSCP_CS5          0xa0
  121 #define IPTOS_DSCP_EF           0xb8
  122 #define IPTOS_DSCP_CS6          0xc0
  123 #define IPTOS_DSCP_CS7          0xe0
  124 
  125 /*
  126  * ECN (Explicit Congestion Notification) codepoints in RFC3168
  127  * mapped to the lower 2 bits of the TOS field.
  128  */
  129 #define IPTOS_ECN_NOTECT        0x00    /* not-ECT */
  130 #define IPTOS_ECN_ECT1          0x01    /* ECN-capable transport (1) */
  131 #define IPTOS_ECN_ECT0          0x02    /* ECN-capable transport (0) */
  132 #define IPTOS_ECN_CE            0x03    /* congestion experienced */
  133 #define IPTOS_ECN_MASK          0x03    /* ECN field mask */
  134 
  135 /*
  136  * Definitions for options.
  137  */
  138 #define IPOPT_COPIED(o)         ((o)&0x80)
  139 #define IPOPT_CLASS(o)          ((o)&0x60)
  140 #define IPOPT_NUMBER(o)         ((o)&0x1f)
  141 
  142 #define IPOPT_CONTROL           0x00
  143 #define IPOPT_RESERVED1         0x20
  144 #define IPOPT_DEBMEAS           0x40
  145 #define IPOPT_RESERVED2         0x60
  146 
  147 #define IPOPT_EOL               0               /* end of option list */
  148 #define IPOPT_NOP               1               /* no operation */
  149 
  150 #define IPOPT_RR                7               /* record packet route */
  151 #define IPOPT_TS                68              /* timestamp */
  152 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
  153 #define IPOPT_LSRR              131             /* loose source route */
  154 #define IPOPT_SATID             136             /* satnet id */
  155 #define IPOPT_SSRR              137             /* strict source route */
  156 #define IPOPT_RA                148             /* router alert */
  157 
  158 /*
  159  * Offsets to fields in options other than EOL and NOP.
  160  */
  161 #define IPOPT_OPTVAL            0               /* option ID */
  162 #define IPOPT_OLEN              1               /* option length */
  163 #define IPOPT_OFFSET            2               /* offset within option */
  164 #define IPOPT_MINOFF            4               /* min value of above */
  165 
  166 /*
  167  * Time stamp option structure.
  168  */
  169 struct  ip_timestamp {
  170         u_int8_t ipt_code;              /* IPOPT_TS */
  171         u_int8_t ipt_len;               /* size of structure (variable) */
  172         u_int8_t ipt_ptr;               /* index of current entry */
  173 #if _BYTE_ORDER == _LITTLE_ENDIAN
  174         u_int    ipt_flg:4,             /* flags, see below */
  175                  ipt_oflw:4;            /* overflow counter */
  176 #endif
  177 #if _BYTE_ORDER == _BIG_ENDIAN
  178         u_int    ipt_oflw:4,            /* overflow counter */
  179                  ipt_flg:4;             /* flags, see below */
  180 #endif
  181         union ipt_timestamp {
  182                  u_int32_t ipt_time[1];
  183                  struct ipt_ta {
  184                         struct in_addr ipt_addr;
  185                         u_int32_t ipt_time;
  186                  } ipt_ta[1];
  187         } ipt_timestamp;
  188 };
  189 
  190 /* flag bits for ipt_flg */
  191 #define IPOPT_TS_TSONLY         0               /* timestamps only */
  192 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
  193 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
  194 
  195 /* bits for security (not byte swapped) */
  196 #define IPOPT_SECUR_UNCLASS     0x0000
  197 #define IPOPT_SECUR_CONFID      0xf135
  198 #define IPOPT_SECUR_EFTO        0x789a
  199 #define IPOPT_SECUR_MMMM        0xbc4d
  200 #define IPOPT_SECUR_RESTR       0xaf13
  201 #define IPOPT_SECUR_SECRET      0xd788
  202 #define IPOPT_SECUR_TOPSECRET   0x6bc5
  203 
  204 /*
  205  * Internet implementation parameters.
  206  */
  207 #define MAXTTL          255             /* maximum time to live (seconds) */
  208 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
  209 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
  210 #define IPTTLDEC        1               /* subtracted when forwarding */
  211 
  212 #define IP_MSS          576             /* default maximum segment size */
  213 
  214 #ifdef _KERNEL
  215 
  216 /* Maximum length for IP protocol queues */
  217 #define IPQ_MAXLEN      2048
  218 
  219 /*
  220  * This is the real IPv4 pseudo header, used for computing the TCP and UDP
  221  * checksums. For the Internet checksum, struct ipovly can be used instead.
  222  * For stronger checksums, the real thing must be used.
  223  */
  224 struct ippseudo {
  225         struct    in_addr ippseudo_src; /* source internet address */
  226         struct    in_addr ippseudo_dst; /* destination internet address */
  227         u_int8_t  ippseudo_pad;         /* pad, must be zero */
  228         u_int8_t  ippseudo_p;           /* protocol */
  229         u_int16_t ippseudo_len;         /* protocol length */
  230 };
  231 #endif /* _KERNEL */
  232 
  233 #endif /* _NETINET_IP_H_ */

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