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-rw-r--r--print-igrp.c149
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diff --git a/print-igrp.c b/print-igrp.c
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+/*
+ * Copyright (c) 1996, 1997
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Initial contribution from Francis Dupont (francis.dupont@inria.fr)
+ */
+
+/* \summary: Interior Gateway Routing Protocol (IGRP) printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "extract.h"
+
+/* Cisco IGRP definitions */
+
+/* IGRP Header */
+
+struct igrphdr {
+ nd_uint8_t ig_vop; /* protocol version number / opcode */
+#define IGRP_V(x) (((x) & 0xf0) >> 4)
+#define IGRP_OP(x) ((x) & 0x0f)
+ nd_uint8_t ig_ed; /* edition number */
+ nd_uint16_t ig_as; /* autonomous system number */
+ nd_uint16_t ig_ni; /* number of subnet in local net */
+ nd_uint16_t ig_ns; /* number of networks in AS */
+ nd_uint16_t ig_nx; /* number of networks outside AS */
+ nd_uint16_t ig_sum; /* checksum of IGRP header & data */
+};
+
+#define IGRP_UPDATE 1
+#define IGRP_REQUEST 2
+
+/* IGRP routing entry */
+
+struct igrprte {
+ nd_byte igr_net[3]; /* 3 significant octets of IP address */
+ nd_uint24_t igr_dly; /* delay in tens of microseconds */
+ nd_uint24_t igr_bw; /* bandwidth in units of 1 kb/s */
+ nd_uint16_t igr_mtu; /* MTU in octets */
+ nd_uint8_t igr_rel; /* percent packets successfully tx/rx */
+ nd_uint8_t igr_ld; /* percent of channel occupied */
+ nd_uint8_t igr_hct; /* hop count */
+};
+
+#define IGRP_RTE_SIZE 14 /* sizeof() is accurate now */
+
+static void
+igrp_entry_print(netdissect_options *ndo, const struct igrprte *igr)
+{
+ u_int delay, bandwidth;
+ u_int metric, mtu;
+
+ delay = GET_BE_U_3(igr->igr_dly);
+ bandwidth = GET_BE_U_3(igr->igr_bw);
+ metric = ND_MIN(bandwidth + delay, 0xffffff);
+ mtu = GET_BE_U_2(igr->igr_mtu);
+
+ ND_PRINT(" d=%u b=%u r=%u l=%u M=%u mtu=%u in %u hops",
+ 10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth,
+ GET_U_1(igr->igr_rel), GET_U_1(igr->igr_ld), metric,
+ mtu, GET_U_1(igr->igr_hct));
+}
+
+static const struct tok op2str[] = {
+ { IGRP_UPDATE, "update" },
+ { IGRP_REQUEST, "request" },
+ { 0, NULL }
+};
+
+void
+igrp_print(netdissect_options *ndo, const u_char *bp, u_int length)
+{
+ const struct igrphdr *hdr;
+ const u_char *cp;
+ u_int nint, nsys, next;
+ uint16_t cksum;
+
+ ndo->ndo_protocol = "igrp";
+ hdr = (const struct igrphdr *)bp;
+ cp = (const u_char *)(hdr + 1);
+ ND_PRINT("igrp:");
+
+ /* Header */
+ nint = GET_BE_U_2(hdr->ig_ni);
+ nsys = GET_BE_U_2(hdr->ig_ns);
+ next = GET_BE_U_2(hdr->ig_nx);
+
+ ND_PRINT(" %s V%u edit=%u AS=%u (%u/%u/%u)",
+ tok2str(op2str, "op-#%u", IGRP_OP(GET_U_1(hdr->ig_vop))),
+ IGRP_V(GET_U_1(hdr->ig_vop)),
+ GET_U_1(hdr->ig_ed),
+ GET_BE_U_2(hdr->ig_as),
+ nint,
+ nsys,
+ next);
+ cksum = GET_BE_U_2(hdr->ig_sum);
+ if (ndo->ndo_vflag)
+ ND_PRINT(" checksum=0x%04x", cksum);
+
+ length -= sizeof(*hdr);
+ while (length >= IGRP_RTE_SIZE) {
+ const struct igrprte *igr = (const struct igrprte *)cp;
+ uint8_t net0 = GET_U_1(&igr->igr_net[0]);
+ uint8_t net1 = GET_U_1(&igr->igr_net[1]);
+ uint8_t net2 = GET_U_1(&igr->igr_net[2]);
+
+ if (nint > 0) {
+ ND_PRINT(" *.%u.%u.%u", net0, net1, net2);
+ igrp_entry_print(ndo, igr);
+ --nint;
+ } else if (nsys > 0) {
+ ND_PRINT(" %u.%u.%u.0", net0, net1, net2);
+ igrp_entry_print(ndo, igr);
+ --nsys;
+ } else if (next > 0) {
+ ND_PRINT(" X%u.%u.%u.0", net0, net1, net2);
+ igrp_entry_print(ndo, igr);
+ --next;
+ } else {
+ ND_PRINT(" [extra bytes %u]", length);
+ break;
+ }
+ cp += IGRP_RTE_SIZE;
+ length -= IGRP_RTE_SIZE;
+ }
+ if (nint || nsys || next || length)
+ nd_print_invalid(ndo);
+}