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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.
    6  * 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        8.2 (Berkeley) 6/1/94
   33  * $FreeBSD$
   34  */
   35 
   36 #ifndef _NETINET_IP_H_
   37 #define _NETINET_IP_H_
   38 
   39 #include <sys/cdefs.h>
   40 
   41 /*
   42  * Definitions for internet protocol version 4.
   43  *
   44  * Per RFC 791, September 1981.
   45  */
   46 #define IPVERSION       4
   47 
   48 /*
   49  * Structure of an internet header, naked of options.
   50  */
   51 struct ip {
   52 #if BYTE_ORDER == LITTLE_ENDIAN
   53         u_char  ip_hl:4,                /* header length */
   54                 ip_v:4;                 /* version */
   55 #endif
   56 #if BYTE_ORDER == BIG_ENDIAN
   57         u_char  ip_v:4,                 /* version */
   58                 ip_hl:4;                /* header length */
   59 #endif
   60         u_char  ip_tos;                 /* type of service */
   61         u_short ip_len;                 /* total length */
   62         u_short ip_id;                  /* identification */
   63         u_short ip_off;                 /* fragment offset field */
   64 #define IP_RF 0x8000                    /* reserved fragment flag */
   65 #define IP_DF 0x4000                    /* dont fragment flag */
   66 #define IP_MF 0x2000                    /* more fragments flag */
   67 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
   68         u_char  ip_ttl;                 /* time to live */
   69         u_char  ip_p;                   /* protocol */
   70         u_short ip_sum;                 /* checksum */
   71         struct  in_addr ip_src,ip_dst;  /* source and dest address */
   72 } __packed __aligned(2);
   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 
   84 /*
   85  * Definitions for IP precedence (also in ip_tos) (deprecated).
   86  */
   87 #define IPTOS_PREC_NETCONTROL           IPTOS_DSCP_CS7
   88 #define IPTOS_PREC_INTERNETCONTROL      IPTOS_DSCP_CS6
   89 #define IPTOS_PREC_CRITIC_ECP           IPTOS_DSCP_CS5
   90 #define IPTOS_PREC_FLASHOVERRIDE        IPTOS_DSCP_CS4
   91 #define IPTOS_PREC_FLASH                IPTOS_DSCP_CS3
   92 #define IPTOS_PREC_IMMEDIATE            IPTOS_DSCP_CS2
   93 #define IPTOS_PREC_PRIORITY             IPTOS_DSCP_CS1
   94 #define IPTOS_PREC_ROUTINE              IPTOS_DSCP_CS0
   95 
   96 /*
   97  * Offset of Diffserv decimal value to convert it to tos value .
   98  */
   99 #define IPTOS_DSCP_OFFSET               2
  100 
  101 /*
  102  * Definitions for DiffServ Codepoints as per RFC2474 and RFC5865.
  103  */
  104 #define IPTOS_DSCP_CS0          0x00
  105 #define IPTOS_DSCP_CS1          0x20
  106 #define IPTOS_DSCP_AF11         0x28
  107 #define IPTOS_DSCP_AF12         0x30
  108 #define IPTOS_DSCP_AF13         0x38
  109 #define IPTOS_DSCP_CS2          0x40
  110 #define IPTOS_DSCP_AF21         0x48
  111 #define IPTOS_DSCP_AF22         0x50
  112 #define IPTOS_DSCP_AF23         0x58
  113 #define IPTOS_DSCP_CS3          0x60
  114 #define IPTOS_DSCP_AF31         0x68
  115 #define IPTOS_DSCP_AF32         0x70
  116 #define IPTOS_DSCP_AF33         0x78
  117 #define IPTOS_DSCP_CS4          0x80
  118 #define IPTOS_DSCP_AF41         0x88
  119 #define IPTOS_DSCP_AF42         0x90
  120 #define IPTOS_DSCP_AF43         0x98
  121 #define IPTOS_DSCP_CS5          0xa0
  122 #define IPTOS_DSCP_VA           0xb0
  123 #define IPTOS_DSCP_EF           0xb8
  124 #define IPTOS_DSCP_CS6          0xc0
  125 #define IPTOS_DSCP_CS7          0xe0
  126 
  127 /*
  128  * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the
  129  * lower 2 bits of the TOS field.
  130  */
  131 #define IPTOS_ECN_NOTECT        0x00    /* not-ECT */
  132 #define IPTOS_ECN_ECT1          0x01    /* ECN-capable transport (1) */
  133 #define IPTOS_ECN_ECT0          0x02    /* ECN-capable transport (0) */
  134 #define IPTOS_ECN_CE            0x03    /* congestion experienced */
  135 #define IPTOS_ECN_MASK          0x03    /* ECN field mask */
  136 
  137 /*
  138  * Definitions for options.
  139  */
  140 #define IPOPT_COPIED(o)         ((o)&0x80)
  141 #define IPOPT_CLASS(o)          ((o)&0x60)
  142 #define IPOPT_NUMBER(o)         ((o)&0x1f)
  143 
  144 #define IPOPT_CONTROL           0x00
  145 #define IPOPT_RESERVED1         0x20
  146 #define IPOPT_DEBMEAS           0x40
  147 #define IPOPT_RESERVED2         0x60
  148 
  149 #define IPOPT_EOL               0               /* end of option list */
  150 #define IPOPT_NOP               1               /* no operation */
  151 
  152 #define IPOPT_RR                7               /* record packet route */
  153 #define IPOPT_TS                68              /* timestamp */
  154 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
  155 #define IPOPT_LSRR              131             /* loose source route */
  156 #define IPOPT_ESO               133             /* extended security */
  157 #define IPOPT_CIPSO             134             /* commercial security */
  158 #define IPOPT_SATID             136             /* satnet id */
  159 #define IPOPT_SSRR              137             /* strict source route */
  160 #define IPOPT_RA                148             /* router alert */
  161 
  162 /*
  163  * Offsets to fields in options other than EOL and NOP.
  164  */
  165 #define IPOPT_OPTVAL            0               /* option ID */
  166 #define IPOPT_OLEN              1               /* option length */
  167 #define IPOPT_OFFSET            2               /* offset within option */
  168 #define IPOPT_MINOFF            4               /* min value of above */
  169 
  170 /*
  171  * Time stamp option structure.
  172  */
  173 struct  ip_timestamp {
  174         u_char  ipt_code;               /* IPOPT_TS */
  175         u_char  ipt_len;                /* size of structure (variable) */
  176         u_char  ipt_ptr;                /* index of current entry */
  177 #if BYTE_ORDER == LITTLE_ENDIAN
  178         u_char  ipt_flg:4,              /* flags, see below */
  179                 ipt_oflw:4;             /* overflow counter */
  180 #endif
  181 #if BYTE_ORDER == BIG_ENDIAN
  182         u_char  ipt_oflw:4,             /* overflow counter */
  183                 ipt_flg:4;              /* flags, see below */
  184 #endif
  185         union ipt_timestamp {
  186                 uint32_t        ipt_time[1];    /* network format */
  187                 struct  ipt_ta {
  188                         struct in_addr ipt_addr;
  189                         uint32_t ipt_time;      /* network format */
  190                 } ipt_ta[1];
  191         } ipt_timestamp;
  192 };
  193 
  194 /* Flag bits for ipt_flg. */
  195 #define IPOPT_TS_TSONLY         0               /* timestamps only */
  196 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
  197 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
  198 
  199 /* Bits for security (not byte swapped). */
  200 #define IPOPT_SECUR_UNCLASS     0x0000
  201 #define IPOPT_SECUR_CONFID      0xf135
  202 #define IPOPT_SECUR_EFTO        0x789a
  203 #define IPOPT_SECUR_MMMM        0xbc4d
  204 #define IPOPT_SECUR_RESTR       0xaf13
  205 #define IPOPT_SECUR_SECRET      0xd788
  206 #define IPOPT_SECUR_TOPSECRET   0x6bc5
  207 
  208 /*
  209  * Internet implementation parameters.
  210  */
  211 #define MAXTTL          255             /* maximum time to live (seconds) */
  212 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
  213 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
  214 #define IPTTLDEC        1               /* subtracted when forwarding */
  215 #define IP_MSS          576             /* default maximum segment size */
  216 
  217 /*
  218  * This is the real IPv4 pseudo header, used for computing the TCP and UDP
  219  * checksums. For the Internet checksum, struct ipovly can be used instead.
  220  * For stronger checksums, the real thing must be used.
  221  */
  222 struct ippseudo {
  223         struct  in_addr ippseudo_src;   /* source internet address */
  224         struct  in_addr ippseudo_dst;   /* destination internet address */
  225         u_char          ippseudo_pad;   /* pad, must be zero */
  226         u_char          ippseudo_p;     /* protocol */
  227         u_short         ippseudo_len;   /* protocol length */
  228 };
  229 #endif

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