/*      $OpenBSD: igrp.h,v 1.5 2022/12/28 21:30:19 jmc Exp $    */

/* Cisco IGRP definitions */

/* IGRP Header */

struct igrphdr {
#ifdef WORDS_BIGENDIAN
        u_char ig_v:4;          /* protocol version number */
        u_char ig_op:4;         /* opcode */
#else
        u_char ig_op:4;         /* opcode */
        u_char ig_v:4;          /* protocol version number */
#endif
        u_char ig_ed;           /* edition number */
        u_short ig_as;          /* autonomous system number */
        u_short ig_ni;          /* number of subnet in local net */
        u_short ig_ns;          /* number of networks in AS */
        u_short ig_nx;          /* number of networks outside AS */
        u_short ig_sum;         /* checksum of IGRP header & data */
};

#define IGRP_UPDATE     1
#define IGRP_REQUEST    2

/* IGRP routing entry */

struct igrprte {
        u_char igr_net[3];      /* 3 significant octets of IP address */
        u_char igr_dly[3];      /* delay in tens of microseconds */
        u_char igr_bw[3];       /* bandwidth in units of 1 kb/s */
        u_char igr_mtu[2];      /* MTU in octets */
        u_char igr_rel;         /* percent packets successfully tx/rx */
        u_char igr_ld;          /* percent of channel occupied */
        u_char igr_hct;         /* hop count */
};

#define IGRP_RTE_SIZE   14      /* don't believe sizeof ! */