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Annotation of 43BSDTahoe/sys/netinet/ip.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  *
        !            17:  *     @(#)ip.h        7.7 (Berkeley) 6/29/88
        !            18:  */
        !            19: 
        !            20: /*
        !            21:  * Definitions for internet protocol version 4.
        !            22:  * Per RFC 791, September 1981.
        !            23:  */
        !            24: #define        IPVERSION       4
        !            25: 
        !            26: /*
        !            27:  * Structure of an internet header, naked of options.
        !            28:  *
        !            29:  * We declare ip_len and ip_off to be short, rather than u_short
        !            30:  * pragmatically since otherwise unsigned comparisons can result
        !            31:  * against negative integers quite easily, and fail in subtle ways.
        !            32:  */
        !            33: struct ip {
        !            34: #if BYTE_ORDER == LITTLE_ENDIAN 
        !            35:        u_char  ip_hl:4,                /* header length */
        !            36:                ip_v:4;                 /* version */
        !            37: #endif
        !            38: #if BYTE_ORDER == BIG_ENDIAN 
        !            39:        u_char  ip_v:4,                 /* version */
        !            40:                ip_hl:4;                /* header length */
        !            41: #endif
        !            42:        u_char  ip_tos;                 /* type of service */
        !            43:        short   ip_len;                 /* total length */
        !            44:        u_short ip_id;                  /* identification */
        !            45:        short   ip_off;                 /* fragment offset field */
        !            46: #define        IP_DF 0x4000                    /* dont fragment flag */
        !            47: #define        IP_MF 0x2000                    /* more fragments flag */
        !            48:        u_char  ip_ttl;                 /* time to live */
        !            49:        u_char  ip_p;                   /* protocol */
        !            50:        u_short ip_sum;                 /* checksum */
        !            51:        struct  in_addr ip_src,ip_dst;  /* source and dest address */
        !            52: };
        !            53: 
        !            54: #define        IP_MAXPACKET    65535           /* maximum packet size */
        !            55: 
        !            56: /*
        !            57:  * Definitions for options.
        !            58:  */
        !            59: #define        IPOPT_COPIED(o)         ((o)&0x80)
        !            60: #define        IPOPT_CLASS(o)          ((o)&0x60)
        !            61: #define        IPOPT_NUMBER(o)         ((o)&0x1f)
        !            62: 
        !            63: #define        IPOPT_CONTROL           0x00
        !            64: #define        IPOPT_RESERVED1         0x20
        !            65: #define        IPOPT_DEBMEAS           0x40
        !            66: #define        IPOPT_RESERVED2         0x60
        !            67: 
        !            68: #define        IPOPT_EOL               0               /* end of option list */
        !            69: #define        IPOPT_NOP               1               /* no operation */
        !            70: 
        !            71: #define        IPOPT_RR                7               /* record packet route */
        !            72: #define        IPOPT_TS                68              /* timestamp */
        !            73: #define        IPOPT_SECURITY          130             /* provide s,c,h,tcc */
        !            74: #define        IPOPT_LSRR              131             /* loose source route */
        !            75: #define        IPOPT_SATID             136             /* satnet id */
        !            76: #define        IPOPT_SSRR              137             /* strict source route */
        !            77: 
        !            78: /*
        !            79:  * Offsets to fields in options other than EOL and NOP.
        !            80:  */
        !            81: #define        IPOPT_OPTVAL            0               /* option ID */
        !            82: #define        IPOPT_OLEN              1               /* option length */
        !            83: #define IPOPT_OFFSET           2               /* offset within option */
        !            84: #define        IPOPT_MINOFF            4               /* min value of above */
        !            85: 
        !            86: /*
        !            87:  * Time stamp option structure.
        !            88:  */
        !            89: struct ip_timestamp {
        !            90:        u_char  ipt_code;               /* IPOPT_TS */
        !            91:        u_char  ipt_len;                /* size of structure (variable) */
        !            92:        u_char  ipt_ptr;                /* index of current entry */
        !            93: #if BYTE_ORDER == LITTLE_ENDIAN 
        !            94:        u_char  ipt_flg:4,              /* flags, see below */
        !            95:                ipt_oflw:4;             /* overflow counter */
        !            96: #endif
        !            97: #if BYTE_ORDER == BIG_ENDIAN 
        !            98:        u_char  ipt_oflw:4,             /* overflow counter */
        !            99:                ipt_flg:4;              /* flags, see below */
        !           100: #endif
        !           101:        union ipt_timestamp {
        !           102:                n_long  ipt_time[1];
        !           103:                struct  ipt_ta {
        !           104:                        struct in_addr ipt_addr;
        !           105:                        n_long ipt_time;
        !           106:                } ipt_ta[1];
        !           107:        } ipt_timestamp;
        !           108: };
        !           109: 
        !           110: /* flag bits for ipt_flg */
        !           111: #define        IPOPT_TS_TSONLY         0               /* timestamps only */
        !           112: #define        IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
        !           113: #define        IPOPT_TS_PRESPEC        2               /* specified modules only */
        !           114: 
        !           115: /* bits for security (not byte swapped) */
        !           116: #define        IPOPT_SECUR_UNCLASS     0x0000
        !           117: #define        IPOPT_SECUR_CONFID      0xf135
        !           118: #define        IPOPT_SECUR_EFTO        0x789a
        !           119: #define        IPOPT_SECUR_MMMM        0xbc4d
        !           120: #define        IPOPT_SECUR_RESTR       0xaf13
        !           121: #define        IPOPT_SECUR_SECRET      0xd788
        !           122: #define        IPOPT_SECUR_TOPSECRET   0x6bc5
        !           123: 
        !           124: /*
        !           125:  * Internet implementation parameters.
        !           126:  */
        !           127: #define        MAXTTL          255             /* maximum time to live (seconds) */
        !           128: #define        IPFRAGTTL       60              /* time to live for frags, slowhz */
        !           129: #define        IPTTLDEC        1               /* subtracted when forwarding */
        !           130: 
        !           131: #define        IP_MSS          576             /* default maximum segment size */

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