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Annotation of kernel/bsd/netinet/ip.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            26: /*
        !            27:  * Copyright (c) 1982, 1986, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * Redistribution and use in source and binary forms, with or without
        !            31:  * modification, are permitted provided that the following conditions
        !            32:  * are met:
        !            33:  * 1. Redistributions of source code must retain the above copyright
        !            34:  *    notice, this list of conditions and the following disclaimer.
        !            35:  * 2. Redistributions in binary form must reproduce the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer in the
        !            37:  *    documentation and/or other materials provided with the distribution.
        !            38:  * 3. All advertising materials mentioning features or use of this software
        !            39:  *    must display the following acknowledgement:
        !            40:  *     This product includes software developed by the University of
        !            41:  *     California, Berkeley and its contributors.
        !            42:  * 4. Neither the name of the University nor the names of its contributors
        !            43:  *    may be used to endorse or promote products derived from this software
        !            44:  *    without specific prior written permission.
        !            45:  *
        !            46:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            47:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            48:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            49:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            50:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            51:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            52:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            53:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            54:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            55:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            56:  * SUCH DAMAGE.
        !            57:  *
        !            58:  *     @(#)ip.h        8.2 (Berkeley) 6/1/94
        !            59:  */
        !            60: 
        !            61: /*
        !            62:  * Definitions for internet protocol version 4.
        !            63:  * Per RFC 791, September 1981.
        !            64:  */
        !            65: #define        IPVERSION       4
        !            66: 
        !            67: /*
        !            68:  * Structure of an internet header, naked of options.
        !            69:  *
        !            70:  * We declare ip_len and ip_off to be short, rather than u_short
        !            71:  * pragmatically since otherwise unsigned comparisons can result
        !            72:  * against negative integers quite easily, and fail in subtle ways.
        !            73:  */
        !            74: struct ip {
        !            75: #if BYTE_ORDER == LITTLE_ENDIAN
        !            76:        u_char  ip_hl:4,                /* header length */
        !            77:                ip_v:4;                 /* version */
        !            78: #endif
        !            79: #if BYTE_ORDER == BIG_ENDIAN
        !            80:        u_char  ip_v:4,                 /* version */
        !            81:                ip_hl:4;                /* header length */
        !            82: #endif
        !            83:        u_char  ip_tos;                 /* type of service */
        !            84:        short   ip_len;                 /* total length */
        !            85:        u_short ip_id;                  /* identification */
        !            86:        short   ip_off;                 /* fragment offset field */
        !            87: #define        IP_DF 0x4000                    /* dont fragment flag */
        !            88: #define        IP_MF 0x2000                    /* more fragments flag */
        !            89: #define        IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
        !            90:        u_char  ip_ttl;                 /* time to live */
        !            91:        u_char  ip_p;                   /* protocol */
        !            92:        u_short ip_sum;                 /* checksum */
        !            93:        struct  in_addr ip_src,ip_dst;  /* source and dest address */
        !            94: };
        !            95: 
        !            96: #define        IP_MAXPACKET    65535           /* maximum packet size */
        !            97: 
        !            98: /*
        !            99:  * Definitions for IP type of service (ip_tos)
        !           100:  */
        !           101: #define        IPTOS_LOWDELAY          0x10
        !           102: #define        IPTOS_THROUGHPUT        0x08
        !           103: #define        IPTOS_RELIABILITY       0x04
        !           104: 
        !           105: /*
        !           106:  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
        !           107:  */
        !           108: #define        IPTOS_PREC_NETCONTROL           0xe0
        !           109: #define        IPTOS_PREC_INTERNETCONTROL      0xc0
        !           110: #define        IPTOS_PREC_CRITIC_ECP           0xa0
        !           111: #define        IPTOS_PREC_FLASHOVERRIDE        0x80
        !           112: #define        IPTOS_PREC_FLASH                0x60
        !           113: #define        IPTOS_PREC_IMMEDIATE            0x40
        !           114: #define        IPTOS_PREC_PRIORITY             0x20
        !           115: #define        IPTOS_PREC_ROUTINE              0x00
        !           116: 
        !           117: /*
        !           118:  * Definitions for options.
        !           119:  */
        !           120: #define        IPOPT_COPIED(o)         ((o)&0x80)
        !           121: #define        IPOPT_CLASS(o)          ((o)&0x60)
        !           122: #define        IPOPT_NUMBER(o)         ((o)&0x1f)
        !           123: 
        !           124: #define        IPOPT_CONTROL           0x00
        !           125: #define        IPOPT_RESERVED1         0x20
        !           126: #define        IPOPT_DEBMEAS           0x40
        !           127: #define        IPOPT_RESERVED2         0x60
        !           128: 
        !           129: #define        IPOPT_EOL               0               /* end of option list */
        !           130: #define        IPOPT_NOP               1               /* no operation */
        !           131: 
        !           132: #define        IPOPT_RR                7               /* record packet route */
        !           133: #define        IPOPT_TS                68              /* timestamp */
        !           134: #define        IPOPT_SECURITY          130             /* provide s,c,h,tcc */
        !           135: #define        IPOPT_LSRR              131             /* loose source route */
        !           136: #define        IPOPT_SATID             136             /* satnet id */
        !           137: #define        IPOPT_SSRR              137             /* strict source route */
        !           138: 
        !           139: /*
        !           140:  * Offsets to fields in options other than EOL and NOP.
        !           141:  */
        !           142: #define        IPOPT_OPTVAL            0               /* option ID */
        !           143: #define        IPOPT_OLEN              1               /* option length */
        !           144: #define        IPOPT_OFFSET            2               /* offset within option */
        !           145: #define        IPOPT_MINOFF            4               /* min value of above */
        !           146: 
        !           147: /*
        !           148:  * Time stamp option structure.
        !           149:  */
        !           150: struct ip_timestamp {
        !           151:        u_char  ipt_code;               /* IPOPT_TS */
        !           152:        u_char  ipt_len;                /* size of structure (variable) */
        !           153:        u_char  ipt_ptr;                /* index of current entry */
        !           154: #if BYTE_ORDER == LITTLE_ENDIAN
        !           155:        u_char  ipt_flg:4,              /* flags, see below */
        !           156:                ipt_oflw:4;             /* overflow counter */
        !           157: #endif
        !           158: #if BYTE_ORDER == BIG_ENDIAN
        !           159:        u_char  ipt_oflw:4,             /* overflow counter */
        !           160:                ipt_flg:4;              /* flags, see below */
        !           161: #endif
        !           162:        union ipt_timestamp {
        !           163:                n_long  ipt_time[1];
        !           164:                struct  ipt_ta {
        !           165:                        struct in_addr ipt_addr;
        !           166:                        n_long ipt_time;
        !           167:                } ipt_ta[1];
        !           168:        } ipt_timestamp;
        !           169: };
        !           170: 
        !           171: /* flag bits for ipt_flg */
        !           172: #define        IPOPT_TS_TSONLY         0               /* timestamps only */
        !           173: #define        IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
        !           174: #define        IPOPT_TS_PRESPEC        3               /* specified modules only */
        !           175: 
        !           176: /* bits for security (not byte swapped) */
        !           177: #define        IPOPT_SECUR_UNCLASS     0x0000
        !           178: #define        IPOPT_SECUR_CONFID      0xf135
        !           179: #define        IPOPT_SECUR_EFTO        0x789a
        !           180: #define        IPOPT_SECUR_MMMM        0xbc4d
        !           181: #define        IPOPT_SECUR_RESTR       0xaf13
        !           182: #define        IPOPT_SECUR_SECRET      0xd788
        !           183: #define        IPOPT_SECUR_TOPSECRET   0x6bc5
        !           184: 
        !           185: /*
        !           186:  * Internet implementation parameters.
        !           187:  */
        !           188: #define        MAXTTL          255             /* maximum time to live (seconds) */
        !           189: #define        IPDEFTTL        64              /* default ttl, from RFC 1340 */
        !           190: #define        IPFRAGTTL       60              /* time to live for frags, slowhz */
        !           191: #define        IPTTLDEC        1               /* subtracted when forwarding */
        !           192: 
        !           193: #define        IP_MSS          576             /* default maximum segment size */

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