#ifndef IP_ICMPHEADER

#define IP_ICMPHEADER

struct icmp {
       BYTE icmp_type;
       BYTE icmp_code;
       WORD icmp_cksum;
       WORD icmp_id;
       WORD icmp_seq;
       char icmp_data[1];
};

#define SIZE_ICMP_HDR   8
#define SIZE_TIME_DATA  8

struct ip {
       BYTE    ip_hl:4,                /* header length */
               ip_v:4;                 /* version */
       BYTE    ip_tos;                 /* type of service */
       short   ip_len;                 /* total length */
       u_short ip_id;                  /* identification */
       short   ip_off;                 /* fragment offset field */
       BYTE    ip_ttl;                 /* time to live */
       BYTE    ip_p;                   /* protocol */
       u_short ip_sum;                 /* checksum */
       struct  in_addr ip_src,ip_dst;  /* source and dest address */
};

#define ICMP_ECHOREPLY            0    /* echo reply */
#define ICMP_UNREACH              3    /* dest unreachable, codes: */
#define   ICMP_UNREACH_NET        0    /* bad net */
#define   ICMP_UNREACH_HOST       1    /* bad host */
#define   ICMP_UNREACH_PROTOCOL   2    /* bad protocol */
#define   ICMP_UNREACH_PORT       3    /* bad port */
#define   ICMP_UNREACH_NEEDFRAG   4    /* IP_DF caused drop */
#define   ICMP_UNREACH_SRCFAIL    5    /* src route failed */
#define ICMP_SOURCEQUENCH         4    /* packet lost, slow down */
#define ICMP_REDIRECT             5    /* shorter route, codes: */
#define   ICMP_REDIRECT_NET       0    /* for network */
#define   ICMP_REDIRECT_HOST      1    /* for host */
#define   ICMP_REDIRECT_TOSNET    2    /* for tos and net */
#define   ICMP_REDIRECT_TOSHOST   3    /* for tos and host */
#define ICMP_ECHO                 8    /* echo service */
#define ICMP_TIMXCEED             11   /* time exceeded, code: */
#define   ICMP_TIMXCEED_INTRANS   0    /* ttl==0 in transit */
#define   ICMP_TIMXCEED_REASS     1    /* ttl==0 in reass */
#define ICMP_PARAMPROB            12   /* ip header bad */
#define ICMP_TSTAMP               13   /* timestamp request */
#define ICMP_TSTAMPREPLY          14   /* timestamp reply */
#define ICMP_IREQ                 15   /* information request */
#define ICMP_IREQREPLY            16   /* information reply */
#define ICMP_MASKREQ              17   /* address mask request */
#define ICMP_MASKREPLY            18   /* address mask reply */

#define ICMP_MAXTYPE              18

#define ICMP_MINLEN     8                               /* abs minimum */
#define ICMP_TSLEN      (8 + 3 * sizeof (n_time))       /* timestamp */
#define ICMP_MASKLEN    12                              /* address mask */
#define ICMP_ADVLENMIN  (8 + sizeof (struct ip) + 8)    /* min */
#define ICMP_ADVLEN(p)  (8 + ((p)->icmp_ip.ip_hl << 2) + 8)

#define STNORM          0

/* Definition of the lowest telnet byte following an IAC byte */
#define LOW_TEL_OPT 236

#define TEL_EOF     236
#define SUSP        237
#define ABORT       238

#define SE          240
#define NOP         241
#define DM          242
#define BREAK       243
#define IP          244
#define AO          245
#define AYT         246
#define EC          247
#define EL          248
#define GOAHEAD     249
#define SB          250
#define WILL        251
#define WONT        252
#define DO          253
#define DONT        254
#define IAC         255

#endif