The Tcpdump Group git mirrors - tcpdump/blob - print-igrp.c

   1 /*
   2  * Copyright (c) 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Initial contribution from Francis Dupont (francis.dupont@inria.fr)
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <tcpdump-stdinc.h>
  29
  30 #include <stdio.h>
  31
  32 #include "interface.h"
  33 #include "addrtoname.h"
  34 #include "ip.h"
  35 #include "extract.h"                    /* must come after interface.h */
  36
  37 /* Cisco IGRP definitions */
  38
  39 /* IGRP Header */
  40
  41 struct igrphdr {
  42         u_int8_t ig_vop;        /* protocol version number / opcode */
  43 #define IGRP_V(x)       (((x) & 0xf0) >> 4)
  44 #define IGRP_OP(x)      ((x) & 0x0f)
  45         u_int8_t ig_ed;         /* edition number */
  46         u_int16_t ig_as;        /* autonomous system number */
  47         u_int16_t ig_ni;        /* number of subnet in local net */
  48         u_int16_t ig_ns;        /* number of networks in AS */
  49         u_int16_t ig_nx;        /* number of networks ouside AS */
  50         u_int16_t ig_sum;       /* checksum of IGRP header & data */
  51 };
  52
  53 #define IGRP_UPDATE     1
  54 #define IGRP_REQUEST    2
  55
  56 /* IGRP routing entry */
  57
  58 struct igrprte {
  59         u_int8_t igr_net[3];    /* 3 significant octets of IP address */
  60         u_int8_t igr_dly[3];    /* delay in tens of microseconds */
  61         u_int8_t igr_bw[3];     /* bandwidth in units of 1 kb/s */
  62         u_int8_t igr_mtu[2];    /* MTU in octets */
  63         u_int8_t igr_rel;       /* percent packets successfully tx/rx */
  64         u_int8_t igr_ld;        /* percent of channel occupied */
  65         u_int8_t igr_hct;       /* hop count */
  66 };
  67
  68 #define IGRP_RTE_SIZE   14      /* don't believe sizeof ! */
  69
  70 static void
  71 igrp_entry_print(register struct igrprte *igr, register int is_interior,
  72     register int is_exterior)
  73 {
  74         register u_int delay, bandwidth;
  75         u_int metric, mtu;
  76
  77         if (is_interior)
  78                 printf(" *.%d.%d.%d", igr->igr_net[0],
  79                     igr->igr_net[1], igr->igr_net[2]);
  80         else if (is_exterior)
  81                 printf(" X%d.%d.%d.0", igr->igr_net[0],
  82                     igr->igr_net[1], igr->igr_net[2]);
  83         else
  84                 printf(" %d.%d.%d.0", igr->igr_net[0],
  85                     igr->igr_net[1], igr->igr_net[2]);
  86
  87         delay = EXTRACT_24BITS(igr->igr_dly);
  88         bandwidth = EXTRACT_24BITS(igr->igr_bw);
  89         metric = bandwidth + delay;
  90         if (metric > 0xffffff)
  91                 metric = 0xffffff;
  92         mtu = EXTRACT_16BITS(igr->igr_mtu);
  93
  94         printf(" d=%d b=%d r=%d l=%d M=%d mtu=%d in %d hops",
  95             10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth,
  96             igr->igr_rel, igr->igr_ld, metric,
  97             mtu, igr->igr_hct);
  98 }
  99
 100 static const struct tok op2str[] = {
 101         { IGRP_UPDATE,          "update" },
 102         { IGRP_REQUEST,         "request" },
 103         { 0,                    NULL }
 104 };
 105
 106 void
 107 igrp_print(register const u_char *bp, u_int length, const u_char *bp2 _U_)
 108 {
 109         register struct igrphdr *hdr;
 110         register u_char *cp;
 111         u_int nint, nsys, next;
 112
 113         hdr = (struct igrphdr *)bp;
 114         cp = (u_char *)(hdr + 1);
 115         (void)printf("igrp:");
 116
 117         /* Header */
 118         TCHECK(*hdr);
 119         nint = EXTRACT_16BITS(&hdr->ig_ni);
 120         nsys = EXTRACT_16BITS(&hdr->ig_ns);
 121         next = EXTRACT_16BITS(&hdr->ig_nx);
 122
 123         (void)printf(" %s V%d edit=%d AS=%d (%d/%d/%d)",
 124             tok2str(op2str, "op-#%d", IGRP_OP(hdr->ig_vop)),
 125             IGRP_V(hdr->ig_vop),
 126             hdr->ig_ed,
 127             EXTRACT_16BITS(&hdr->ig_as),
 128             nint,
 129             nsys,
 130             next);
 131
 132         length -= sizeof(*hdr);
 133         while (length >= IGRP_RTE_SIZE) {
 134                 if (nint > 0) {
 135                         TCHECK2(*cp, IGRP_RTE_SIZE);
 136                         igrp_entry_print((struct igrprte *)cp, 1, 0);
 137                         --nint;
 138                 } else if (nsys > 0) {
 139                         TCHECK2(*cp, IGRP_RTE_SIZE);
 140                         igrp_entry_print((struct igrprte *)cp, 0, 0);
 141                         --nsys;
 142                 } else if (next > 0) {
 143                         TCHECK2(*cp, IGRP_RTE_SIZE);
 144                         igrp_entry_print((struct igrprte *)cp, 0, 1);
 145                         --next;
 146                 } else {
 147                         (void)printf(" [extra bytes %d]", length);
 148                         break;
 149                 }
 150                 cp += IGRP_RTE_SIZE;
 151                 length -= IGRP_RTE_SIZE;
 152         }
 153         if (nint == 0 && nsys == 0 && next == 0)
 154                 return;
 155 trunc:
 156         fputs(" [|igrp]", stdout);
 157 }