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Annotation of 42BSD/sys/netinet/ip_icmp.h, revision 1.1

1.1     ! root        1: /* ip_icmp.h 6.1 83/07/29 */
        !             2: 
        !             3: /*
        !             4:  * Interface Control Message Protocol Definitions.
        !             5:  * Per RFC 792, September 1981.
        !             6:  */
        !             7: 
        !             8: /*
        !             9:  * Structure of an icmp header.
        !            10:  */
        !            11: struct icmp {
        !            12:        u_char  icmp_type;              /* type of message, see below */
        !            13:        u_char  icmp_code;              /* type sub code */
        !            14:        u_short icmp_cksum;             /* ones complement cksum of struct */
        !            15:        union {
        !            16:                u_char ih_pptr;                 /* ICMP_PARAMPROB */
        !            17:                struct in_addr ih_gwaddr;       /* ICMP_REDIRECT */
        !            18:                struct ih_idseq {
        !            19:                        n_short icd_id;
        !            20:                        n_short icd_seq;
        !            21:                } ih_idseq;
        !            22:                int ih_void;
        !            23:        } icmp_hun;
        !            24: #define        icmp_pptr       icmp_hun.ih_pptr
        !            25: #define        icmp_gwaddr     icmp_hun.ih_gwaddr
        !            26: #define        icmp_id         icmp_hun.ih_idseq.icd_id
        !            27: #define        icmp_seq        icmp_hun.ih_idseq.icd_seq
        !            28: #define        icmp_void       icmp_hun.ih_void
        !            29:        union {
        !            30:                struct id_ts {
        !            31:                        n_time its_otime;
        !            32:                        n_time its_rtime;
        !            33:                        n_time its_ttime;
        !            34:                } id_ts;
        !            35:                struct id_ip  {
        !            36:                        struct ip idi_ip;
        !            37:                        /* options and then 64 bits of data */
        !            38:                } id_ip;
        !            39:        } icmp_dun;
        !            40: #define        icmp_otime      icmp_dun.id_ts.its_otime
        !            41: #define        icmp_rtime      icmp_dun.id_ts.its_rtime
        !            42: #define        icmp_ttime      icmp_dun.id_ts.its_ttime
        !            43: #define        icmp_ip         icmp_dun.id_ip.idi_ip
        !            44: };
        !            45: 
        !            46: /*
        !            47:  * Lower bounds on packet lengths for various types.
        !            48:  * For the error advice packets must first insure that the
        !            49:  * packet is large enought to contain the returned ip header.
        !            50:  * Only then can we do the check to see if 64 bits of packet
        !            51:  * data have been returned, since we need to check the returned
        !            52:  * ip header length.
        !            53:  */
        !            54: #define        ICMP_MINLEN     8                               /* abs minimum */
        !            55: #define        ICMP_TSLEN      (8 + 3 * sizeof (n_time))       /* timestamp */
        !            56: #define        ICMP_ADVLENMIN  (8 + sizeof (struct ip) + 8)    /* min */
        !            57: #define        ICMP_ADVLEN(p)  (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
        !            58:        /* N.B.: must separately check that ip_hl >= 5 */
        !            59: 
        !            60: /*
        !            61:  * Definition of type and code field values.
        !            62:  */
        !            63: #define        ICMP_ECHOREPLY          0               /* echo reply */
        !            64: #define        ICMP_UNREACH            3               /* dest unreachable, codes: */
        !            65: #define                ICMP_UNREACH_NET        0               /* bad net */
        !            66: #define                ICMP_UNREACH_HOST       1               /* bad host */
        !            67: #define                ICMP_UNREACH_PROTOCOL   2               /* bad protocol */
        !            68: #define                ICMP_UNREACH_PORT       3               /* bad port */
        !            69: #define                ICMP_UNREACH_NEEDFRAG   4               /* IP_DF caused drop */
        !            70: #define                ICMP_UNREACH_SRCFAIL    5               /* src route failed */
        !            71: #define        ICMP_SOURCEQUENCH       4               /* packet lost, slow down */
        !            72: #define        ICMP_REDIRECT           5               /* shorter route, codes: */
        !            73: #define                ICMP_REDIRECT_NET       0               /* for network */
        !            74: #define                ICMP_REDIRECT_HOST      1               /* for host */
        !            75: #define                ICMP_REDIRECT_TOSNET    2               /* for tos and net */
        !            76: #define                ICMP_REDIRECT_TOSHOST   3               /* for tos and host */
        !            77: #define        ICMP_ECHO               8               /* echo service */
        !            78: #define        ICMP_TIMXCEED           11              /* time exceeded, code: */
        !            79: #define                ICMP_TIMXCEED_INTRANS   0               /* ttl==0 in transit */
        !            80: #define                ICMP_TIMXCEED_REASS     1               /* ttl==0 in reass */
        !            81: #define        ICMP_PARAMPROB          12              /* ip header bad */
        !            82: #define        ICMP_TSTAMP             13              /* timestamp request */
        !            83: #define        ICMP_TSTAMPREPLY        14              /* timestamp reply */
        !            84: #define        ICMP_IREQ               15              /* information request */
        !            85: #define        ICMP_IREQREPLY          16              /* information reply */

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