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.
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 4. Neither the name of the University nor the names of its contributors
   15  *    may be used to endorse or promote products derived from this software
   16  *    without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  *      @(#)ip.h        8.2 (Berkeley) 6/1/94
   31  * $FreeBSD$
   32  */
   33 
   34 #ifndef _NETINET_IP_H_
   35 #define _NETINET_IP_H_
   36 
   37 #include <sys/cdefs.h>
   38 
   39 /*
   40  * Definitions for internet protocol version 4.
   41  *
   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 #if BYTE_ORDER == LITTLE_ENDIAN
   51         u_int   ip_hl:4,                /* header length */
   52                 ip_v:4;                 /* version */
   53 #endif
   54 #if BYTE_ORDER == BIG_ENDIAN
   55         u_int   ip_v:4,                 /* version */
   56                 ip_hl:4;                /* header length */
   57 #endif
   58         u_char  ip_tos;                 /* type of service */
   59         u_short ip_len;                 /* total length */
   60         u_short ip_id;                  /* identification */
   61         u_short ip_off;                 /* fragment offset field */
   62 #define IP_RF 0x8000                    /* reserved fragment flag */
   63 #define IP_DF 0x4000                    /* dont fragment flag */
   64 #define IP_MF 0x2000                    /* more fragments flag */
   65 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
   66         u_char  ip_ttl;                 /* time to live */
   67         u_char  ip_p;                   /* protocol */
   68         u_short ip_sum;                 /* checksum */
   69         struct  in_addr ip_src,ip_dst;  /* source and dest address */
   70 } __packed __aligned(4);
   71 
   72 #ifdef CTASSERT
   73 CTASSERT(sizeof (struct ip) == 20);
   74 #endif
   75 
   76 #define IP_MAXPACKET    65535           /* maximum packet size */
   77 
   78 /*
   79  * Definitions for IP type of service (ip_tos).
   80  */
   81 #define IPTOS_LOWDELAY          0x10
   82 #define IPTOS_THROUGHPUT        0x08
   83 #define IPTOS_RELIABILITY       0x04
   84 #define IPTOS_MINCOST           0x02
   85 #if 1
   86 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
   87 #define IPTOS_CE                0x01
   88 #define IPTOS_ECT               0x02
   89 #endif
   90 
   91 /*
   92  * Definitions for IP precedence (also in ip_tos) (hopefully unused).
   93  */
   94 #define IPTOS_PREC_NETCONTROL           0xe0
   95 #define IPTOS_PREC_INTERNETCONTROL      0xc0
   96 #define IPTOS_PREC_CRITIC_ECP           0xa0
   97 #define IPTOS_PREC_FLASHOVERRIDE        0x80
   98 #define IPTOS_PREC_FLASH                0x60
   99 #define IPTOS_PREC_IMMEDIATE            0x40
  100 #define IPTOS_PREC_PRIORITY             0x20
  101 #define IPTOS_PREC_ROUTINE              0x00
  102 
  103 /*
  104  * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the
  105  * lower 2 bits of the TOS field.
  106  */
  107 #define IPTOS_ECN_NOTECT        0x00    /* not-ECT */
  108 #define IPTOS_ECN_ECT1          0x01    /* ECN-capable transport (1) */
  109 #define IPTOS_ECN_ECT0          0x02    /* ECN-capable transport (0) */
  110 #define IPTOS_ECN_CE            0x03    /* congestion experienced */
  111 #define IPTOS_ECN_MASK          0x03    /* ECN field mask */
  112 
  113 /*
  114  * Definitions for options.
  115  */
  116 #define IPOPT_COPIED(o)         ((o)&0x80)
  117 #define IPOPT_CLASS(o)          ((o)&0x60)
  118 #define IPOPT_NUMBER(o)         ((o)&0x1f)
  119 
  120 #define IPOPT_CONTROL           0x00
  121 #define IPOPT_RESERVED1         0x20
  122 #define IPOPT_DEBMEAS           0x40
  123 #define IPOPT_RESERVED2         0x60
  124 
  125 #define IPOPT_EOL               0               /* end of option list */
  126 #define IPOPT_NOP               1               /* no operation */
  127 
  128 #define IPOPT_RR                7               /* record packet route */
  129 #define IPOPT_TS                68              /* timestamp */
  130 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
  131 #define IPOPT_LSRR              131             /* loose source route */
  132 #define IPOPT_ESO               133             /* extended security */
  133 #define IPOPT_CIPSO             134             /* commerical security */
  134 #define IPOPT_SATID             136             /* satnet id */
  135 #define IPOPT_SSRR              137             /* strict source route */
  136 #define IPOPT_RA                148             /* router alert */
  137 
  138 /*
  139  * Offsets to fields in options other than EOL and NOP.
  140  */
  141 #define IPOPT_OPTVAL            0               /* option ID */
  142 #define IPOPT_OLEN              1               /* option length */
  143 #define IPOPT_OFFSET            2               /* offset within option */
  144 #define IPOPT_MINOFF            4               /* min value of above */
  145 
  146 /*
  147  * Time stamp option structure.
  148  */
  149 struct  ip_timestamp {
  150         u_char  ipt_code;               /* IPOPT_TS */
  151         u_char  ipt_len;                /* size of structure (variable) */
  152         u_char  ipt_ptr;                /* index of current entry */
  153 #if BYTE_ORDER == LITTLE_ENDIAN
  154         u_int   ipt_flg:4,              /* flags, see below */
  155                 ipt_oflw:4;             /* overflow counter */
  156 #endif
  157 #if BYTE_ORDER == BIG_ENDIAN
  158         u_int   ipt_oflw:4,             /* overflow counter */
  159                 ipt_flg:4;              /* flags, see below */
  160 #endif
  161         union ipt_timestamp {
  162                 n_long  ipt_time[1];
  163                 struct  ipt_ta {
  164                         struct in_addr ipt_addr;
  165                         n_long ipt_time;
  166                 } ipt_ta[1];
  167         } ipt_timestamp;
  168 };
  169 
  170 /* Flag bits for ipt_flg. */
  171 #define IPOPT_TS_TSONLY         0               /* timestamps only */
  172 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
  173 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
  174 
  175 /* Bits for security (not byte swapped). */
  176 #define IPOPT_SECUR_UNCLASS     0x0000
  177 #define IPOPT_SECUR_CONFID      0xf135
  178 #define IPOPT_SECUR_EFTO        0x789a
  179 #define IPOPT_SECUR_MMMM        0xbc4d
  180 #define IPOPT_SECUR_RESTR       0xaf13
  181 #define IPOPT_SECUR_SECRET      0xd788
  182 #define IPOPT_SECUR_TOPSECRET   0x6bc5
  183 
  184 /*
  185  * Internet implementation parameters.
  186  */
  187 #define MAXTTL          255             /* maximum time to live (seconds) */
  188 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
  189 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
  190 #define IPTTLDEC        1               /* subtracted when forwarding */
  191 #define IP_MSS          576             /* default maximum segment size */
  192 
  193 /*
  194  * This is the real IPv4 pseudo header, used for computing the TCP and UDP
  195  * checksums. For the Internet checksum, struct ipovly can be used instead.
  196  * For stronger checksums, the real thing must be used.
  197  */
  198 struct ippseudo {
  199         struct  in_addr ippseudo_src;   /* source internet address */
  200         struct  in_addr ippseudo_dst;   /* destination internet address */
  201         u_char          ippseudo_pad;   /* pad, must be zero */
  202         u_char          ippseudo_p;     /* protocol */
  203         u_short         ippseudo_len;   /* protocol length */
  204 };
  205 #endif

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