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Annotation of 42BSD/sys/netinet/ip_icmp.h, revision 1.1.1.1

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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