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Annotation of kernel/bsd/netinet/ip_icmp.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_icmp.h   8.1 (Berkeley) 6/10/93
        !            59:  */
        !            60: 
        !            61: /*
        !            62:  * Interface Control Message Protocol Definitions.
        !            63:  * Per RFC 792, September 1981.
        !            64:  */
        !            65: 
        !            66: /*
        !            67:  * Structure of an icmp header.
        !            68:  */
        !            69: struct icmp {
        !            70:        u_char  icmp_type;              /* type of message, see below */
        !            71:        u_char  icmp_code;              /* type sub code */
        !            72:        u_short icmp_cksum;             /* ones complement cksum of struct */
        !            73:        union {
        !            74:                u_char ih_pptr;                 /* ICMP_PARAMPROB */
        !            75:                struct in_addr ih_gwaddr;       /* ICMP_REDIRECT */
        !            76:                struct ih_idseq {
        !            77:                        n_short icd_id;
        !            78:                        n_short icd_seq;
        !            79:                } ih_idseq;
        !            80:                int ih_void;
        !            81: 
        !            82:                /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
        !            83:                struct ih_pmtu {
        !            84:                        n_short ipm_void;    
        !            85:                        n_short ipm_nextmtu;
        !            86:                } ih_pmtu;
        !            87:        } icmp_hun;
        !            88: #define        icmp_pptr       icmp_hun.ih_pptr
        !            89: #define        icmp_gwaddr     icmp_hun.ih_gwaddr
        !            90: #define        icmp_id         icmp_hun.ih_idseq.icd_id
        !            91: #define        icmp_seq        icmp_hun.ih_idseq.icd_seq
        !            92: #define        icmp_void       icmp_hun.ih_void
        !            93: #define        icmp_pmvoid     icmp_hun.ih_pmtu.ipm_void
        !            94: #define        icmp_nextmtu    icmp_hun.ih_pmtu.ipm_nextmtu
        !            95:        union {
        !            96:                struct id_ts {
        !            97:                        n_time its_otime;
        !            98:                        n_time its_rtime;
        !            99:                        n_time its_ttime;
        !           100:                } id_ts;
        !           101:                struct id_ip  {
        !           102:                        struct ip idi_ip;
        !           103:                        /* options and then 64 bits of data */
        !           104:                } id_ip;
        !           105:                u_long  id_mask;
        !           106:                char    id_data[1];
        !           107:        } icmp_dun;
        !           108: #define        icmp_otime      icmp_dun.id_ts.its_otime
        !           109: #define        icmp_rtime      icmp_dun.id_ts.its_rtime
        !           110: #define        icmp_ttime      icmp_dun.id_ts.its_ttime
        !           111: #define        icmp_ip         icmp_dun.id_ip.idi_ip
        !           112: #define        icmp_mask       icmp_dun.id_mask
        !           113: #define        icmp_data       icmp_dun.id_data
        !           114: };
        !           115: 
        !           116: /*
        !           117:  * Lower bounds on packet lengths for various types.
        !           118:  * For the error advice packets must first insure that the
        !           119:  * packet is large enought to contain the returned ip header.
        !           120:  * Only then can we do the check to see if 64 bits of packet
        !           121:  * data have been returned, since we need to check the returned
        !           122:  * ip header length.
        !           123:  */
        !           124: #define        ICMP_MINLEN     8                               /* abs minimum */
        !           125: #define        ICMP_TSLEN      (8 + 3 * sizeof (n_time))       /* timestamp */
        !           126: #define        ICMP_MASKLEN    12                              /* address mask */
        !           127: #define        ICMP_ADVLENMIN  (8 + sizeof (struct ip) + 8)    /* min */
        !           128: #define        ICMP_ADVLEN(p)  (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
        !           129:        /* N.B.: must separately check that ip_hl >= 5 */
        !           130: 
        !           131: /*
        !           132:  * Definition of type and code field values.
        !           133:  */
        !           134: #define        ICMP_ECHOREPLY          0               /* echo reply */
        !           135: #define        ICMP_UNREACH            3               /* dest unreachable, codes: */
        !           136: #define                ICMP_UNREACH_NET        0               /* bad net */
        !           137: #define                ICMP_UNREACH_HOST       1               /* bad host */
        !           138: #define                ICMP_UNREACH_PROTOCOL   2               /* bad protocol */
        !           139: #define                ICMP_UNREACH_PORT       3               /* bad port */
        !           140: #define                ICMP_UNREACH_NEEDFRAG   4               /* IP_DF caused drop */
        !           141: #define                ICMP_UNREACH_SRCFAIL    5               /* src route failed */
        !           142: #define                ICMP_UNREACH_NET_UNKNOWN 6              /* unknown net */
        !           143: #define                ICMP_UNREACH_HOST_UNKNOWN 7             /* unknown host */
        !           144: #define                ICMP_UNREACH_ISOLATED   8               /* src host isolated */
        !           145: #define                ICMP_UNREACH_NET_PROHIB 9               /* prohibited access */
        !           146: #define                ICMP_UNREACH_HOST_PROHIB 10             /* ditto */
        !           147: #define                ICMP_UNREACH_TOSNET     11              /* bad tos for net */
        !           148: #define                ICMP_UNREACH_TOSHOST    12              /* bad tos for host */
        !           149: #define        ICMP_SOURCEQUENCH       4               /* packet lost, slow down */
        !           150: #define        ICMP_REDIRECT           5               /* shorter route, codes: */
        !           151: #define                ICMP_REDIRECT_NET       0               /* for network */
        !           152: #define                ICMP_REDIRECT_HOST      1               /* for host */
        !           153: #define                ICMP_REDIRECT_TOSNET    2               /* for tos and net */
        !           154: #define                ICMP_REDIRECT_TOSHOST   3               /* for tos and host */
        !           155: #define        ICMP_ECHO               8               /* echo service */
        !           156: #define        ICMP_ROUTERADVERT       9               /* router advertisement */
        !           157: #define        ICMP_ROUTERSOLICIT      10              /* router solicitation */
        !           158: #define        ICMP_TIMXCEED           11              /* time exceeded, code: */
        !           159: #define                ICMP_TIMXCEED_INTRANS   0               /* ttl==0 in transit */
        !           160: #define                ICMP_TIMXCEED_REASS     1               /* ttl==0 in reass */
        !           161: #define        ICMP_PARAMPROB          12              /* ip header bad */
        !           162: #define                ICMP_PARAMPROB_OPTABSENT 1              /* req. opt. absent */
        !           163: #define        ICMP_TSTAMP             13              /* timestamp request */
        !           164: #define        ICMP_TSTAMPREPLY        14              /* timestamp reply */
        !           165: #define        ICMP_IREQ               15              /* information request */
        !           166: #define        ICMP_IREQREPLY          16              /* information reply */
        !           167: #define        ICMP_MASKREQ            17              /* address mask request */
        !           168: #define        ICMP_MASKREPLY          18              /* address mask reply */
        !           169: 
        !           170: #define        ICMP_MAXTYPE            18
        !           171: 
        !           172: #define        ICMP_INFOTYPE(type) \
        !           173:        ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
        !           174:        (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
        !           175:        (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
        !           176:        (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
        !           177:        (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
        !           178: 
        !           179: #ifdef _KERNEL
        !           180: void   icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *));
        !           181: void   icmp_input __P((struct mbuf *, int));
        !           182: void   icmp_reflect __P((struct mbuf *));
        !           183: void   icmp_send __P((struct mbuf *, struct mbuf *));
        !           184: int    icmp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
        !           185: #endif
        !           186: 
        !           187: #define ICMP_NETMASK_RETRY_MAX 5               /* Max. retries for getting netmask */

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