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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1982, 1986, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)ip.h        8.2 (Berkeley) 6/1/94
        !            55:  */
        !            56: 
        !            57: #ifndef _NETINET_IP_H_
        !            58: #define _NETINET_IP_H_
        !            59: 
        !            60: /*
        !            61:  * Definitions for internet protocol version 4.
        !            62:  * Per RFC 791, September 1981.
        !            63:  */
        !            64: #define        IPVERSION       4
        !            65: 
        !            66: /*
        !            67:  * Structure of an internet header, naked of options.
        !            68:  */
        !            69: struct ip {
        !            70: #ifdef _IP_VHL
        !            71:        u_char  ip_vhl;                 /* version << 4 | header length >> 2 */
        !            72: #else
        !            73: #if BYTE_ORDER == LITTLE_ENDIAN
        !            74:        u_int   ip_hl:4,                /* header length */
        !            75:                ip_v:4;                 /* version */
        !            76: #endif
        !            77: #if BYTE_ORDER == BIG_ENDIAN
        !            78:        u_int   ip_v:4,                 /* version */
        !            79:                ip_hl:4;                /* header length */
        !            80: #endif
        !            81: #endif /* not _IP_VHL */
        !            82:        u_char  ip_tos;                 /* type of service */
        !            83:        u_short ip_len;                 /* total length */
        !            84:        u_short ip_id;                  /* identification */
        !            85:        u_short ip_off;                 /* fragment offset field */
        !            86: #define        IP_RF 0x8000                    /* reserved fragment flag */
        !            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: #ifdef _IP_VHL
        !            97: #define        IP_MAKE_VHL(v, hl)      ((v) << 4 | (hl))
        !            98: #define        IP_VHL_HL(vhl)          ((vhl) & 0x0f)
        !            99: #define        IP_VHL_V(vhl)           ((vhl) >> 4)
        !           100: #define        IP_VHL_BORING           0x45
        !           101: #endif
        !           102: 
        !           103: #define        IP_MAXPACKET    65535           /* maximum packet size */
        !           104: 
        !           105: /*
        !           106:  * Definitions for IP type of service (ip_tos)
        !           107:  */
        !           108: #define        IPTOS_LOWDELAY          0x10
        !           109: #define        IPTOS_THROUGHPUT        0x08
        !           110: #define        IPTOS_RELIABILITY       0x04
        !           111: #define        IPTOS_MINCOST           0x02
        !           112: 
        !           113: /*
        !           114:  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
        !           115:  */
        !           116: #define        IPTOS_PREC_NETCONTROL           0xe0
        !           117: #define        IPTOS_PREC_INTERNETCONTROL      0xc0
        !           118: #define        IPTOS_PREC_CRITIC_ECP           0xa0
        !           119: #define        IPTOS_PREC_FLASHOVERRIDE        0x80
        !           120: #define        IPTOS_PREC_FLASH                0x60
        !           121: #define        IPTOS_PREC_IMMEDIATE            0x40
        !           122: #define        IPTOS_PREC_PRIORITY             0x20
        !           123: #define        IPTOS_PREC_ROUTINE              0x00
        !           124: 
        !           125: /*
        !           126:  * Definitions for options.
        !           127:  */
        !           128: #define        IPOPT_COPIED(o)         ((o)&0x80)
        !           129: #define        IPOPT_CLASS(o)          ((o)&0x60)
        !           130: #define        IPOPT_NUMBER(o)         ((o)&0x1f)
        !           131: 
        !           132: #define        IPOPT_CONTROL           0x00
        !           133: #define        IPOPT_RESERVED1         0x20
        !           134: #define        IPOPT_DEBMEAS           0x40
        !           135: #define        IPOPT_RESERVED2         0x60
        !           136: 
        !           137: #define        IPOPT_EOL               0               /* end of option list */
        !           138: #define        IPOPT_NOP               1               /* no operation */
        !           139: 
        !           140: #define        IPOPT_RR                7               /* record packet route */
        !           141: #define        IPOPT_TS                68              /* timestamp */
        !           142: #define        IPOPT_SECURITY          130             /* provide s,c,h,tcc */
        !           143: #define        IPOPT_LSRR              131             /* loose source route */
        !           144: #define        IPOPT_SATID             136             /* satnet id */
        !           145: #define        IPOPT_SSRR              137             /* strict source route */
        !           146: #define        IPOPT_RA                148             /* router alert */
        !           147: 
        !           148: /*
        !           149:  * Offsets to fields in options other than EOL and NOP.
        !           150:  */
        !           151: #define        IPOPT_OPTVAL            0               /* option ID */
        !           152: #define        IPOPT_OLEN              1               /* option length */
        !           153: #define IPOPT_OFFSET           2               /* offset within option */
        !           154: #define        IPOPT_MINOFF            4               /* min value of above */
        !           155: 
        !           156: /*
        !           157:  * Time stamp option structure.
        !           158:  */
        !           159: struct ip_timestamp {
        !           160:        u_char  ipt_code;               /* IPOPT_TS */
        !           161:        u_char  ipt_len;                /* size of structure (variable) */
        !           162:        u_char  ipt_ptr;                /* index of current entry */
        !           163: #if BYTE_ORDER == LITTLE_ENDIAN
        !           164:        u_int   ipt_flg:4,              /* flags, see below */
        !           165:                ipt_oflw:4;             /* overflow counter */
        !           166: #endif
        !           167: #if BYTE_ORDER == BIG_ENDIAN
        !           168:        u_int   ipt_oflw:4,             /* overflow counter */
        !           169:                ipt_flg:4;              /* flags, see below */
        !           170: #endif
        !           171:        union ipt_timestamp {
        !           172:                n_long  ipt_time[1];
        !           173:                struct  ipt_ta {
        !           174:                        struct in_addr ipt_addr;
        !           175:                        n_long ipt_time;
        !           176:                } ipt_ta[1];
        !           177:        } ipt_timestamp;
        !           178: };
        !           179: 
        !           180: /* flag bits for ipt_flg */
        !           181: #define        IPOPT_TS_TSONLY         0               /* timestamps only */
        !           182: #define        IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
        !           183: #define        IPOPT_TS_PRESPEC        3               /* specified modules only */
        !           184: 
        !           185: /* bits for security (not byte swapped) */
        !           186: #define        IPOPT_SECUR_UNCLASS     0x0000
        !           187: #define        IPOPT_SECUR_CONFID      0xf135
        !           188: #define        IPOPT_SECUR_EFTO        0x789a
        !           189: #define        IPOPT_SECUR_MMMM        0xbc4d
        !           190: #define        IPOPT_SECUR_RESTR       0xaf13
        !           191: #define        IPOPT_SECUR_SECRET      0xd788
        !           192: #define        IPOPT_SECUR_TOPSECRET   0x6bc5
        !           193: 
        !           194: /*
        !           195:  * Internet implementation parameters.
        !           196:  */
        !           197: #define        MAXTTL          255             /* maximum time to live (seconds) */
        !           198: #define        IPDEFTTL        64              /* default ttl, from RFC 1340 */
        !           199: #define        IPFRAGTTL       60              /* time to live for frags, slowhz */
        !           200: #define        IPTTLDEC        1               /* subtracted when forwarding */
        !           201: 
        !           202: #define        IP_MSS          576             /* default maximum segment size */
        !           203: 
        !           204: #endif

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