external/bsd/tcpdump/dist/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 #include <sys/cdefs.h>
  25 #ifndef lint
  26 __RCSID("$NetBSD: print-igrp.c,v 1.5 2014/11/20 03:05:03 christos Exp $");
  27 #endif
  28
  29 #define NETDISSECT_REWORKED
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #include <tcpdump-stdinc.h>
  35
  36 #include "interface.h"
  37 #include "extract.h"                    /* must come after interface.h */
  38
  39 /* Cisco IGRP definitions */
  40
  41 /* IGRP Header */
  42
  43 struct igrphdr {
  44         uint8_t ig_vop; /* protocol version number / opcode */
  45 #define IGRP_V(x)       (((x) & 0xf0) >> 4)
  46 #define IGRP_OP(x)      ((x) & 0x0f)
  47         uint8_t ig_ed;          /* edition number */
  48         uint16_t ig_as; /* autonomous system number */
  49         uint16_t ig_ni; /* number of subnet in local net */
  50         uint16_t ig_ns; /* number of networks in AS */
  51         uint16_t ig_nx; /* number of networks ouside AS */
  52         uint16_t ig_sum;        /* checksum of IGRP header & data */
  53 };
  54
  55 #define IGRP_UPDATE     1
  56 #define IGRP_REQUEST    2
  57
  58 /* IGRP routing entry */
  59
  60 struct igrprte {
  61         uint8_t igr_net[3];     /* 3 significant octets of IP address */
  62         uint8_t igr_dly[3];     /* delay in tens of microseconds */
  63         uint8_t igr_bw[3];      /* bandwidth in units of 1 kb/s */
  64         uint8_t igr_mtu[2];     /* MTU in octets */
  65         uint8_t igr_rel;        /* percent packets successfully tx/rx */
  66         uint8_t igr_ld; /* percent of channel occupied */
  67         uint8_t igr_hct;        /* hop count */
  68 };
  69
  70 #define IGRP_RTE_SIZE   14      /* don't believe sizeof ! */
  71
  72 static void
  73 igrp_entry_print(netdissect_options *ndo, register struct igrprte *igr,
  74     register int is_interior, register int is_exterior)
  75 {
  76         register u_int delay, bandwidth;
  77         u_int metric, mtu;
  78
  79         if (is_interior)
  80                 ND_PRINT((ndo, " *.%d.%d.%d", igr->igr_net[0],
  81                     igr->igr_net[1], igr->igr_net[2]));
  82         else if (is_exterior)
  83                 ND_PRINT((ndo, " X%d.%d.%d.0", igr->igr_net[0],
  84                     igr->igr_net[1], igr->igr_net[2]));
  85         else
  86                 ND_PRINT((ndo, " %d.%d.%d.0", igr->igr_net[0],
  87                     igr->igr_net[1], igr->igr_net[2]));
  88
  89         delay = EXTRACT_24BITS(igr->igr_dly);
  90         bandwidth = EXTRACT_24BITS(igr->igr_bw);
  91         metric = bandwidth + delay;
  92         if (metric > 0xffffff)
  93                 metric = 0xffffff;
  94         mtu = EXTRACT_16BITS(igr->igr_mtu);
  95
  96         ND_PRINT((ndo, " d=%d b=%d r=%d l=%d M=%d mtu=%d in %d hops",
  97             10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth,
  98             igr->igr_rel, igr->igr_ld, metric,
  99             mtu, igr->igr_hct));
 100 }
 101
 102 static const struct tok op2str[] = {
 103         { IGRP_UPDATE,          "update" },
 104         { IGRP_REQUEST,         "request" },
 105         { 0,                    NULL }
 106 };
 107
 108 void
 109 igrp_print(netdissect_options *ndo, register const u_char *bp, u_int length)
 110 {
 111         register struct igrphdr *hdr;
 112         register u_char *cp;
 113         u_int nint, nsys, next;
 114
 115         hdr = (struct igrphdr *)bp;
 116         cp = (u_char *)(hdr + 1);
 117         ND_PRINT((ndo, "igrp:"));
 118
 119         /* Header */
 120         ND_TCHECK(*hdr);
 121         nint = EXTRACT_16BITS(&hdr->ig_ni);
 122         nsys = EXTRACT_16BITS(&hdr->ig_ns);
 123         next = EXTRACT_16BITS(&hdr->ig_nx);
 124
 125         ND_PRINT((ndo, " %s V%d edit=%d AS=%d (%d/%d/%d)",
 126             tok2str(op2str, "op-#%d", IGRP_OP(hdr->ig_vop)),
 127             IGRP_V(hdr->ig_vop),
 128             hdr->ig_ed,
 129             EXTRACT_16BITS(&hdr->ig_as),
 130             nint,
 131             nsys,
 132             next));
 133
 134         length -= sizeof(*hdr);
 135         while (length >= IGRP_RTE_SIZE) {
 136                 if (nint > 0) {
 137                         ND_TCHECK2(*cp, IGRP_RTE_SIZE);
 138                         igrp_entry_print(ndo, (struct igrprte *)cp, 1, 0);
 139                         --nint;
 140                 } else if (nsys > 0) {
 141                         ND_TCHECK2(*cp, IGRP_RTE_SIZE);
 142                         igrp_entry_print(ndo, (struct igrprte *)cp, 0, 0);
 143                         --nsys;
 144                 } else if (next > 0) {
 145                         ND_TCHECK2(*cp, IGRP_RTE_SIZE);
 146                         igrp_entry_print(ndo, (struct igrprte *)cp, 0, 1);
 147                         --next;
 148                 } else {
 149                         ND_PRINT((ndo, " [extra bytes %d]", length));
 150                         break;
 151                 }
 152                 cp += IGRP_RTE_SIZE;
 153                 length -= IGRP_RTE_SIZE;
 154         }
 155         if (nint == 0 && nsys == 0 && next == 0)
 156                 return;
 157 trunc:
 158         ND_PRINT((ndo, " [|igrp]"));
 159 }