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 #ifndef lint
  25 static const char rcsid[] _U_ =
  26     "@(#) $Header: /tcpdump/master/tcpdump/print-igrp.c,v 1.21 2005-04-20 21:01:56 guy Exp $ (LBL)";
  27 #endif
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #include <tcpdump-stdinc.h>
  34
  35 #include <stdio.h>
  36
  37 #include "interface.h"
  38 #include "addrtoname.h"
  39 #include "ip.h"
  40 #include "extract.h"                    /* must come after interface.h */
  41
  42 /* Cisco IGRP definitions */
  43
  44 /* IGRP Header */
  45
  46 struct igrphdr {
  47         u_int8_t ig_vop;        /* protocol version number / opcode */
  48 #define IGRP_V(x)       (((x) & 0xf0) >> 4)
  49 #define IGRP_OP(x)      ((x) & 0x0f)
  50         u_int8_t ig_ed;         /* edition number */
  51         u_int16_t ig_as;        /* autonomous system number */
  52         u_int16_t ig_ni;        /* number of subnet in local net */
  53         u_int16_t ig_ns;        /* number of networks in AS */
  54         u_int16_t ig_nx;        /* number of networks ouside AS */
  55         u_int16_t ig_sum;       /* checksum of IGRP header & data */
  56 };
  57
  58 #define IGRP_UPDATE     1
  59 #define IGRP_REQUEST    2
  60
  61 /* IGRP routing entry */
  62
  63 struct igrprte {
  64         u_int8_t igr_net[3];    /* 3 significant octets of IP address */
  65         u_int8_t igr_dly[3];    /* delay in tens of microseconds */
  66         u_int8_t igr_bw[3];     /* bandwidth in units of 1 kb/s */
  67         u_int8_t igr_mtu[2];    /* MTU in octets */
  68         u_int8_t igr_rel;       /* percent packets successfully tx/rx */
  69         u_int8_t igr_ld;        /* percent of channel occupied */
  70         u_int8_t igr_hct;       /* hop count */
  71 };
  72
  73 #define IGRP_RTE_SIZE   14      /* don't believe sizeof ! */
  74
  75 static void
  76 igrp_entry_print(register struct igrprte *igr, register int is_interior,
  77     register int is_exterior)
  78 {
  79         register u_int delay, bandwidth;
  80         u_int metric, mtu;
  81
  82         if (is_interior)
  83                 printf(" *.%d.%d.%d", igr->igr_net[0],
  84                     igr->igr_net[1], igr->igr_net[2]);
  85         else if (is_exterior)
  86                 printf(" X%d.%d.%d.0", igr->igr_net[0],
  87                     igr->igr_net[1], igr->igr_net[2]);
  88         else
  89                 printf(" %d.%d.%d.0", igr->igr_net[0],
  90                     igr->igr_net[1], igr->igr_net[2]);
  91
  92         delay = EXTRACT_24BITS(igr->igr_dly);
  93         bandwidth = EXTRACT_24BITS(igr->igr_bw);
  94         metric = bandwidth + delay;
  95         if (metric > 0xffffff)
  96                 metric = 0xffffff;
  97         mtu = EXTRACT_16BITS(igr->igr_mtu);
  98
  99         printf(" d=%d b=%d r=%d l=%d M=%d mtu=%d in %d hops",
 100             10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth,
 101             igr->igr_rel, igr->igr_ld, metric,
 102             mtu, igr->igr_hct);
 103 }
 104
 105 static const struct tok op2str[] = {
 106         { IGRP_UPDATE,          "update" },
 107         { IGRP_REQUEST,         "request" },
 108         { 0,                    NULL }
 109 };
 110
 111 void
 112 igrp_print(register const u_char *bp, u_int length, const u_char *bp2 _U_)
 113 {
 114         register struct igrphdr *hdr;
 115         register u_char *cp;
 116         u_int nint, nsys, next;
 117
 118         hdr = (struct igrphdr *)bp;
 119         cp = (u_char *)(hdr + 1);
 120         (void)printf("igrp:");
 121
 122         /* Header */
 123         TCHECK(*hdr);
 124         nint = EXTRACT_16BITS(&hdr->ig_ni);
 125         nsys = EXTRACT_16BITS(&hdr->ig_ns);
 126         next = EXTRACT_16BITS(&hdr->ig_nx);
 127
 128         (void)printf(" %s V%d edit=%d AS=%d (%d/%d/%d)",
 129             tok2str(op2str, "op-#%d", IGRP_OP(hdr->ig_vop)),
 130             IGRP_V(hdr->ig_vop),
 131             hdr->ig_ed,
 132             EXTRACT_16BITS(&hdr->ig_as),
 133             nint,
 134             nsys,
 135             next);
 136
 137         length -= sizeof(*hdr);
 138         while (length >= IGRP_RTE_SIZE) {
 139                 if (nint > 0) {
 140                         TCHECK2(*cp, IGRP_RTE_SIZE);
 141                         igrp_entry_print((struct igrprte *)cp, 1, 0);
 142                         --nint;
 143                 } else if (nsys > 0) {
 144                         TCHECK2(*cp, IGRP_RTE_SIZE);
 145                         igrp_entry_print((struct igrprte *)cp, 0, 0);
 146                         --nsys;
 147                 } else if (next > 0) {
 148                         TCHECK2(*cp, IGRP_RTE_SIZE);
 149                         igrp_entry_print((struct igrprte *)cp, 0, 1);
 150                         --next;
 151                 } else {
 152                         (void)printf(" [extra bytes %d]", length);
 153                         break;
 154                 }
 155                 cp += IGRP_RTE_SIZE;
 156                 length -= IGRP_RTE_SIZE;
 157         }
 158         if (nint == 0 && nsys == 0 && next == 0)
 159                 return;
 160 trunc:
 161         fputs(" [|igrp]", stdout);
 162 }