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Annotation of 43BSD/sys/netinet/ip_icmp.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  *     @(#)ip_icmp.h   7.1 (Berkeley) 6/5/86
                      7:  */
                      8: 
                      9: /*
                     10:  * Interface Control Message Protocol Definitions.
                     11:  * Per RFC 792, September 1981.
                     12:  */
                     13: 
                     14: /*
                     15:  * Structure of an icmp header.
                     16:  */
                     17: struct icmp {
                     18:        u_char  icmp_type;              /* type of message, see below */
                     19:        u_char  icmp_code;              /* type sub code */
                     20:        u_short icmp_cksum;             /* ones complement cksum of struct */
                     21:        union {
                     22:                u_char ih_pptr;                 /* ICMP_PARAMPROB */
                     23:                struct in_addr ih_gwaddr;       /* ICMP_REDIRECT */
                     24:                struct ih_idseq {
                     25:                        n_short icd_id;
                     26:                        n_short icd_seq;
                     27:                } ih_idseq;
                     28:                int ih_void;
                     29:        } icmp_hun;
                     30: #define        icmp_pptr       icmp_hun.ih_pptr
                     31: #define        icmp_gwaddr     icmp_hun.ih_gwaddr
                     32: #define        icmp_id         icmp_hun.ih_idseq.icd_id
                     33: #define        icmp_seq        icmp_hun.ih_idseq.icd_seq
                     34: #define        icmp_void       icmp_hun.ih_void
                     35:        union {
                     36:                struct id_ts {
                     37:                        n_time its_otime;
                     38:                        n_time its_rtime;
                     39:                        n_time its_ttime;
                     40:                } id_ts;
                     41:                struct id_ip  {
                     42:                        struct ip idi_ip;
                     43:                        /* options and then 64 bits of data */
                     44:                } id_ip;
                     45:                u_long  id_mask;
                     46:                char    id_data[1];
                     47:        } icmp_dun;
                     48: #define        icmp_otime      icmp_dun.id_ts.its_otime
                     49: #define        icmp_rtime      icmp_dun.id_ts.its_rtime
                     50: #define        icmp_ttime      icmp_dun.id_ts.its_ttime
                     51: #define        icmp_ip         icmp_dun.id_ip.idi_ip
                     52: #define        icmp_mask       icmp_dun.id_mask
                     53: #define        icmp_data       icmp_dun.id_data
                     54: };
                     55: 
                     56: /*
                     57:  * Lower bounds on packet lengths for various types.
                     58:  * For the error advice packets must first insure that the
                     59:  * packet is large enought to contain the returned ip header.
                     60:  * Only then can we do the check to see if 64 bits of packet
                     61:  * data have been returned, since we need to check the returned
                     62:  * ip header length.
                     63:  */
                     64: #define        ICMP_MINLEN     8                               /* abs minimum */
                     65: #define        ICMP_TSLEN      (8 + 3 * sizeof (n_time))       /* timestamp */
                     66: #define        ICMP_MASKLEN    12                              /* address mask */
                     67: #define        ICMP_ADVLENMIN  (8 + sizeof (struct ip) + 8)    /* min */
                     68: #define        ICMP_ADVLEN(p)  (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
                     69:        /* N.B.: must separately check that ip_hl >= 5 */
                     70: 
                     71: /*
                     72:  * Definition of type and code field values.
                     73:  */
                     74: #define        ICMP_ECHOREPLY          0               /* echo reply */
                     75: #define        ICMP_UNREACH            3               /* dest unreachable, codes: */
                     76: #define                ICMP_UNREACH_NET        0               /* bad net */
                     77: #define                ICMP_UNREACH_HOST       1               /* bad host */
                     78: #define                ICMP_UNREACH_PROTOCOL   2               /* bad protocol */
                     79: #define                ICMP_UNREACH_PORT       3               /* bad port */
                     80: #define                ICMP_UNREACH_NEEDFRAG   4               /* IP_DF caused drop */
                     81: #define                ICMP_UNREACH_SRCFAIL    5               /* src route failed */
                     82: #define        ICMP_SOURCEQUENCH       4               /* packet lost, slow down */
                     83: #define        ICMP_REDIRECT           5               /* shorter route, codes: */
                     84: #define                ICMP_REDIRECT_NET       0               /* for network */
                     85: #define                ICMP_REDIRECT_HOST      1               /* for host */
                     86: #define                ICMP_REDIRECT_TOSNET    2               /* for tos and net */
                     87: #define                ICMP_REDIRECT_TOSHOST   3               /* for tos and host */
                     88: #define        ICMP_ECHO               8               /* echo service */
                     89: #define        ICMP_TIMXCEED           11              /* time exceeded, code: */
                     90: #define                ICMP_TIMXCEED_INTRANS   0               /* ttl==0 in transit */
                     91: #define                ICMP_TIMXCEED_REASS     1               /* ttl==0 in reass */
                     92: #define        ICMP_PARAMPROB          12              /* ip header bad */
                     93: #define        ICMP_TSTAMP             13              /* timestamp request */
                     94: #define        ICMP_TSTAMPREPLY        14              /* timestamp reply */
                     95: #define        ICMP_IREQ               15              /* information request */
                     96: #define        ICMP_IREQREPLY          16              /* information reply */
                     97: #define        ICMP_MASKREQ            17              /* address mask request */
                     98: #define        ICMP_MASKREPLY          18              /* address mask reply */
                     99: 
                    100: #define        ICMP_MAXTYPE            18

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