contrib/tcpdump/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 /* \summary: Interior Gateway Routing Protocol (IGRP) printer */
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include <netdissect-stdinc.h>
  31
  32 #include "netdissect.h"
  33 #include "extract.h"
  34
  35 /* Cisco IGRP definitions */
  36
  37 /* IGRP Header */
  38
  39 struct igrphdr {
  40         uint8_t ig_vop; /* protocol version number / opcode */
  41 #define IGRP_V(x)       (((x) & 0xf0) >> 4)
  42 #define IGRP_OP(x)      ((x) & 0x0f)
  43         uint8_t ig_ed;          /* edition number */
  44         uint16_t ig_as; /* autonomous system number */
  45         uint16_t ig_ni; /* number of subnet in local net */
  46         uint16_t ig_ns; /* number of networks in AS */
  47         uint16_t ig_nx; /* number of networks ouside AS */
  48         uint16_t ig_sum;        /* checksum of IGRP header & data */
  49 };
  50
  51 #define IGRP_UPDATE     1
  52 #define IGRP_REQUEST    2
  53
  54 /* IGRP routing entry */
  55
  56 struct igrprte {
  57         uint8_t igr_net[3];     /* 3 significant octets of IP address */
  58         uint8_t igr_dly[3];     /* delay in tens of microseconds */
  59         uint8_t igr_bw[3];      /* bandwidth in units of 1 kb/s */
  60         uint8_t igr_mtu[2];     /* MTU in octets */
  61         uint8_t igr_rel;        /* percent packets successfully tx/rx */
  62         uint8_t igr_ld; /* percent of channel occupied */
  63         uint8_t igr_hct;        /* hop count */
  64 };
  65
  66 #define IGRP_RTE_SIZE   14      /* don't believe sizeof ! */
  67
  68 static void
  69 igrp_entry_print(netdissect_options *ndo, register const struct igrprte *igr,
  70     register int is_interior, register int is_exterior)
  71 {
  72         register u_int delay, bandwidth;
  73         u_int metric, mtu;
  74
  75         if (is_interior)
  76                 ND_PRINT((ndo, " *.%d.%d.%d", igr->igr_net[0],
  77                     igr->igr_net[1], igr->igr_net[2]));
  78         else if (is_exterior)
  79                 ND_PRINT((ndo, " X%d.%d.%d.0", igr->igr_net[0],
  80                     igr->igr_net[1], igr->igr_net[2]));
  81         else
  82                 ND_PRINT((ndo, " %d.%d.%d.0", igr->igr_net[0],
  83                     igr->igr_net[1], igr->igr_net[2]));
  84
  85         delay = EXTRACT_24BITS(igr->igr_dly);
  86         bandwidth = EXTRACT_24BITS(igr->igr_bw);
  87         metric = bandwidth + delay;
  88         if (metric > 0xffffff)
  89                 metric = 0xffffff;
  90         mtu = EXTRACT_16BITS(igr->igr_mtu);
  91
  92         ND_PRINT((ndo, " d=%d b=%d r=%d l=%d M=%d mtu=%d in %d hops",
  93             10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth,
  94             igr->igr_rel, igr->igr_ld, metric,
  95             mtu, igr->igr_hct));
  96 }
  97
  98 static const struct tok op2str[] = {
  99         { IGRP_UPDATE,          "update" },
 100         { IGRP_REQUEST,         "request" },
 101         { 0,                    NULL }
 102 };
 103
 104 void
 105 igrp_print(netdissect_options *ndo, register const u_char *bp, u_int length)
 106 {
 107         register const struct igrphdr *hdr;
 108         register const u_char *cp;
 109         u_int nint, nsys, next;
 110
 111         hdr = (const struct igrphdr *)bp;
 112         cp = (const u_char *)(hdr + 1);
 113         ND_PRINT((ndo, "igrp:"));
 114
 115         /* Header */
 116         ND_TCHECK(*hdr);
 117         nint = EXTRACT_16BITS(&hdr->ig_ni);
 118         nsys = EXTRACT_16BITS(&hdr->ig_ns);
 119         next = EXTRACT_16BITS(&hdr->ig_nx);
 120
 121         ND_PRINT((ndo, " %s V%d edit=%d AS=%d (%d/%d/%d)",
 122             tok2str(op2str, "op-#%d", IGRP_OP(hdr->ig_vop)),
 123             IGRP_V(hdr->ig_vop),
 124             hdr->ig_ed,
 125             EXTRACT_16BITS(&hdr->ig_as),
 126             nint,
 127             nsys,
 128             next));
 129
 130         length -= sizeof(*hdr);
 131         while (length >= IGRP_RTE_SIZE) {
 132                 if (nint > 0) {
 133                         ND_TCHECK2(*cp, IGRP_RTE_SIZE);
 134                         igrp_entry_print(ndo, (const struct igrprte *)cp, 1, 0);
 135                         --nint;
 136                 } else if (nsys > 0) {
 137                         ND_TCHECK2(*cp, IGRP_RTE_SIZE);
 138                         igrp_entry_print(ndo, (const struct igrprte *)cp, 0, 0);
 139                         --nsys;
 140                 } else if (next > 0) {
 141                         ND_TCHECK2(*cp, IGRP_RTE_SIZE);
 142                         igrp_entry_print(ndo, (const struct igrprte *)cp, 0, 1);
 143                         --next;
 144                 } else {
 145                         ND_PRINT((ndo, " [extra bytes %d]", length));
 146                         break;
 147                 }
 148                 cp += IGRP_RTE_SIZE;
 149                 length -= IGRP_RTE_SIZE;
 150         }
 151         if (nint == 0 && nsys == 0 && next == 0)
 152                 return;
 153 trunc:
 154         ND_PRINT((ndo, " [|igrp]"));
 155 }