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Annotation of Net2/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, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)ip.h        7.10 (Berkeley) 6/28/90
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Definitions for internet protocol version 4.
        !            38:  * Per RFC 791, September 1981.
        !            39:  */
        !            40: #define        IPVERSION       4
        !            41: 
        !            42: /*
        !            43:  * Structure of an internet header, naked of options.
        !            44:  *
        !            45:  * We declare ip_len and ip_off to be short, rather than u_short
        !            46:  * pragmatically since otherwise unsigned comparisons can result
        !            47:  * against negative integers quite easily, and fail in subtle ways.
        !            48:  */
        !            49: struct ip {
        !            50: #if BYTE_ORDER == LITTLE_ENDIAN 
        !            51:        u_char  ip_hl:4,                /* header length */
        !            52:                ip_v:4;                 /* version */
        !            53: #endif
        !            54: #if BYTE_ORDER == BIG_ENDIAN 
        !            55:        u_char  ip_v:4,                 /* version */
        !            56:                ip_hl:4;                /* header length */
        !            57: #endif
        !            58:        u_char  ip_tos;                 /* type of service */
        !            59:        short   ip_len;                 /* total length */
        !            60:        u_short ip_id;                  /* identification */
        !            61:        short   ip_off;                 /* fragment offset field */
        !            62: #define        IP_DF 0x4000                    /* dont fragment flag */
        !            63: #define        IP_MF 0x2000                    /* more fragments flag */
        !            64:        u_char  ip_ttl;                 /* time to live */
        !            65:        u_char  ip_p;                   /* protocol */
        !            66:        u_short 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: 
        !            79: /*
        !            80:  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
        !            81:  */
        !            82: #define        IPTOS_PREC_NETCONTROL           0xe0
        !            83: #define        IPTOS_PREC_INTERNETCONTROL      0xc0
        !            84: #define        IPTOS_PREC_CRITIC_ECP           0xa0
        !            85: #define        IPTOS_PREC_FLASHOVERRIDE        0x80
        !            86: #define        IPTOS_PREC_FLASH                0x60
        !            87: #define        IPTOS_PREC_IMMEDIATE            0x40
        !            88: #define        IPTOS_PREC_PRIORITY             0x20
        !            89: #define        IPTOS_PREC_ROUTINE              0x10
        !            90: 
        !            91: /*
        !            92:  * Definitions for options.
        !            93:  */
        !            94: #define        IPOPT_COPIED(o)         ((o)&0x80)
        !            95: #define        IPOPT_CLASS(o)          ((o)&0x60)
        !            96: #define        IPOPT_NUMBER(o)         ((o)&0x1f)
        !            97: 
        !            98: #define        IPOPT_CONTROL           0x00
        !            99: #define        IPOPT_RESERVED1         0x20
        !           100: #define        IPOPT_DEBMEAS           0x40
        !           101: #define        IPOPT_RESERVED2         0x60
        !           102: 
        !           103: #define        IPOPT_EOL               0               /* end of option list */
        !           104: #define        IPOPT_NOP               1               /* no operation */
        !           105: 
        !           106: #define        IPOPT_RR                7               /* record packet route */
        !           107: #define        IPOPT_TS                68              /* timestamp */
        !           108: #define        IPOPT_SECURITY          130             /* provide s,c,h,tcc */
        !           109: #define        IPOPT_LSRR              131             /* loose source route */
        !           110: #define        IPOPT_SATID             136             /* satnet id */
        !           111: #define        IPOPT_SSRR              137             /* strict source route */
        !           112: 
        !           113: /*
        !           114:  * Offsets to fields in options other than EOL and NOP.
        !           115:  */
        !           116: #define        IPOPT_OPTVAL            0               /* option ID */
        !           117: #define        IPOPT_OLEN              1               /* option length */
        !           118: #define IPOPT_OFFSET           2               /* offset within option */
        !           119: #define        IPOPT_MINOFF            4               /* min value of above */
        !           120: 
        !           121: /*
        !           122:  * Time stamp option structure.
        !           123:  */
        !           124: struct ip_timestamp {
        !           125:        u_char  ipt_code;               /* IPOPT_TS */
        !           126:        u_char  ipt_len;                /* size of structure (variable) */
        !           127:        u_char  ipt_ptr;                /* index of current entry */
        !           128: #if BYTE_ORDER == LITTLE_ENDIAN 
        !           129:        u_char  ipt_flg:4,              /* flags, see below */
        !           130:                ipt_oflw:4;             /* overflow counter */
        !           131: #endif
        !           132: #if BYTE_ORDER == BIG_ENDIAN 
        !           133:        u_char  ipt_oflw:4,             /* overflow counter */
        !           134:                ipt_flg:4;              /* flags, see below */
        !           135: #endif
        !           136:        union ipt_timestamp {
        !           137:                n_long  ipt_time[1];
        !           138:                struct  ipt_ta {
        !           139:                        struct in_addr ipt_addr;
        !           140:                        n_long ipt_time;
        !           141:                } ipt_ta[1];
        !           142:        } ipt_timestamp;
        !           143: };
        !           144: 
        !           145: /* flag bits for ipt_flg */
        !           146: #define        IPOPT_TS_TSONLY         0               /* timestamps only */
        !           147: #define        IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
        !           148: #define        IPOPT_TS_PRESPEC        3               /* specified modules only */
        !           149: 
        !           150: /* bits for security (not byte swapped) */
        !           151: #define        IPOPT_SECUR_UNCLASS     0x0000
        !           152: #define        IPOPT_SECUR_CONFID      0xf135
        !           153: #define        IPOPT_SECUR_EFTO        0x789a
        !           154: #define        IPOPT_SECUR_MMMM        0xbc4d
        !           155: #define        IPOPT_SECUR_RESTR       0xaf13
        !           156: #define        IPOPT_SECUR_SECRET      0xd788
        !           157: #define        IPOPT_SECUR_TOPSECRET   0x6bc5
        !           158: 
        !           159: /*
        !           160:  * Internet implementation parameters.
        !           161:  */
        !           162: #define        MAXTTL          255             /* maximum time to live (seconds) */
        !           163: #define        IPFRAGTTL       60              /* time to live for frags, slowhz */
        !           164: #define        IPTTLDEC        1               /* subtracted when forwarding */
        !           165: 
        !           166: #define        IP_MSS          576             /* default maximum segment size */

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