diff options
Diffstat (limited to 'print-igrp.c')
| -rw-r--r-- | print-igrp.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/print-igrp.c b/print-igrp.c new file mode 100644 index 0000000..23dc1f5 --- /dev/null +++ b/print-igrp.c @@ -0,0 +1,149 @@ +/* + * 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); +} |