FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip.h

     /*
      * Copyright (c) 1982, 1986, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)ip.h        8.2 (Berkeley) 6/1/94
     * $FreeBSD: src/sys/netinet/ip.h,v 1.17 1999/12/22 19:13:20 shin Exp $
     */
    
    #ifndef _NETINET_IP_H_
    #define _NETINET_IP_H_
    
    #ifndef _SYS_TYPES_H_
    #include <sys/types.h>
    #endif
    #ifndef _NETINET_IN_H_
    #include <netinet/in.h>
    #endif
    #ifndef _NETINET_IN_SYSTM_H_
    #include <netinet/in_systm.h>
    #endif
    #include <machine/endian.h>
    
    /*
     * Definitions for internet protocol version 4.
     * Per RFC 791, September 1981.
     */
    #define IPVERSION       4
    
    /*
     * Structure of an internet header, naked of options.
     */
    struct ip {
    #ifdef _IP_VHL
            u_char  ip_vhl;                 /* version << 4 | header length >> 2 */
    #elif _BYTE_ORDER == _LITTLE_ENDIAN
            u_int   ip_hl:4,                /* header length */
                    ip_v:4;                 /* version */
    #elif _BYTE_ORDER == _BIG_ENDIAN
            u_int   ip_v:4,                 /* version */
                    ip_hl:4;                /* header length */
    #else
    #error "Byte order not implemented"
    #endif
            u_char  ip_tos;                 /* type of service */
            u_short ip_len;                 /* total length */
            u_short ip_id;                  /* identification */
            u_short ip_off;                 /* fragment offset field */
    #define IP_RF 0x8000                    /* reserved fragment flag */
    #define IP_DF 0x4000                    /* dont fragment flag */
    #define IP_MF 0x2000                    /* more fragments flag */
    #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
            u_char  ip_ttl;                 /* time to live */
            u_char  ip_p;                   /* protocol */
            u_short ip_sum;                 /* checksum */
            struct  in_addr ip_src,ip_dst;  /* source and dest address */
    };
    
    #ifdef _IP_VHL
    #define IP_MAKE_VHL(v, hl)      ((v) << 4 | (hl))
    #define IP_VHL_HL(vhl)          ((vhl) & 0x0f)
    #define IP_VHL_V(vhl)           ((vhl) >> 4)
    #define IP_VHL_BORING           0x45
    #endif
    
    #define IP_MAXPACKET    65535           /* maximum packet size */
    
    /*
     * Definitions for IP type of service (ip_tos)
     */
    #define IPTOS_LOWDELAY          0x10
    #define IPTOS_THROUGHPUT        0x08
   #define IPTOS_RELIABILITY       0x04
   #define IPTOS_MINCOST           0x02
   #if 1
   /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
   #define IPTOS_CE                0x01    /* congestion experienced */
   #define IPTOS_ECT               0x02    /* ECN-capable transport */
   #endif
   
   
   /*
    * Definitions for IP precedence (also in ip_tos) (hopefully unused)
    */
   #define IPTOS_PREC_NETCONTROL           0xe0
   #define IPTOS_PREC_INTERNETCONTROL      0xc0
   #define IPTOS_PREC_CRITIC_ECP           0xa0
   #define IPTOS_PREC_FLASHOVERRIDE        0x80
   #define IPTOS_PREC_FLASH                0x60
   #define IPTOS_PREC_IMMEDIATE            0x40
   #define IPTOS_PREC_PRIORITY             0x20
   #define IPTOS_PREC_ROUTINE              0x00
   
   /*
    * ECN (Explicit Congestion Notification) codepoints in RFC3168
    * mapped to the lower 2 bits of the TOS field.
    */
   #define IPTOS_ECN_NOTECT        0x00    /* not-ECT */
   #define IPTOS_ECN_ECT1          0x01    /* ECN-capable transport (1) */
   #define IPTOS_ECN_ECT0          0x02    /* ECN-capable transport (0) */
   #define IPTOS_ECN_CE            0x03    /* congestion experienced */
   #define IPTOS_ECN_MASK          0x03    /* ECN field mask */
   
   /*
    * Definitions for options.
    */
   #define IPOPT_COPIED(o)         ((o)&0x80)
   #define IPOPT_CLASS(o)          ((o)&0x60)
   #define IPOPT_NUMBER(o)         ((o)&0x1f)
   
   #define IPOPT_CONTROL           0x00
   #define IPOPT_RESERVED1         0x20
   #define IPOPT_DEBMEAS           0x40
   #define IPOPT_RESERVED2         0x60
   
   #define IPOPT_EOL               0               /* end of option list */
   #define IPOPT_NOP               1               /* no operation */
   
   #define IPOPT_RR                7               /* record packet route */
   #define IPOPT_TS                68              /* timestamp */
   #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
   #define IPOPT_LSRR              131             /* loose source route */
   #define IPOPT_SATID             136             /* satnet id */
   #define IPOPT_SSRR              137             /* strict source route */
   #define IPOPT_RA                148             /* router alert */
   
   /*
    * Offsets to fields in options other than EOL and NOP.
    */
   #define IPOPT_OPTVAL            0               /* option ID */
   #define IPOPT_OLEN              1               /* option length */
   #define IPOPT_OFFSET            2               /* offset within option */
   #define IPOPT_MINOFF            4               /* min value of above */
   
   /*
    * Time stamp option structure.
    */
   struct  ip_timestamp {
           u_char  ipt_code;               /* IPOPT_TS */
           u_char  ipt_len;                /* size of structure (variable) */
           u_char  ipt_ptr;                /* index of current entry */
   #if _BYTE_ORDER == _LITTLE_ENDIAN
           u_int   ipt_flg:4,              /* flags, see below */
                   ipt_oflw:4;             /* overflow counter */
   #elif _BYTE_ORDER == _BIG_ENDIAN
           u_int   ipt_oflw:4,             /* overflow counter */
                   ipt_flg:4;              /* flags, see below */
   #else
   #error "Byte order not implemented"
   #endif
           union ipt_timestamp {
                   n_long  ipt_time[1];
                   struct  ipt_ta {
                           struct in_addr ipt_addr;
                           n_long ipt_time;
                   } ipt_ta[1];
           } ipt_timestamp;
   };
   
   /* flag bits for ipt_flg */
   #define IPOPT_TS_TSONLY         0               /* timestamps only */
   #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
   #define IPOPT_TS_PRESPEC        3               /* specified modules only */
   
   /* bits for security (not byte swapped) */
   #define IPOPT_SECUR_UNCLASS     0x0000
   #define IPOPT_SECUR_CONFID      0xf135
   #define IPOPT_SECUR_EFTO        0x789a
   #define IPOPT_SECUR_MMMM        0xbc4d
   #define IPOPT_SECUR_RESTR       0xaf13
   #define IPOPT_SECUR_SECRET      0xd788
   #define IPOPT_SECUR_TOPSECRET   0x6bc5
   
   /*
    * Internet implementation parameters.
    */
   #define MAXTTL          255             /* maximum time to live (seconds) */
   #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
   #define IPFRAGTTL       60              /* time to live for frags, slowhz */
   #define IPTTLDEC        1               /* subtracted when forwarding */
   
   #define IP_MSS          576             /* default maximum segment size */
   
   /*
    * This is the real IPv4 pseudo header, used for computing the TCP and UDP
    * checksums. For the Internet checksum, struct ipovly can be used instead.
    * For stronger checksums, the real thing must be used.
    */
   struct ippseudo {
           struct  in_addr ippseudo_src;   /* source internet address */
           struct  in_addr ippseudo_dst;   /* destination internet address */
           u_int8_t        ippseudo_pad;   /* pad, must be zero */
           u_int8_t        ippseudo_p;     /* protocol */
           u_int16_t       ippseudo_len;   /* protocol length */
   } __packed;
   #endif

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