diff options
Diffstat (limited to 'print-igrp.c')
| -rw-r--r-- | print-igrp.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/print-igrp.c b/print-igrp.c new file mode 100644 index 000000000000..b6eaf3120110 --- /dev/null +++ b/print-igrp.c @@ -0,0 +1,155 @@ +/* + * 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 { + uint8_t ig_vop; /* protocol version number / opcode */ +#define IGRP_V(x) (((x) & 0xf0) >> 4) +#define IGRP_OP(x) ((x) & 0x0f) + uint8_t ig_ed; /* edition number */ + uint16_t ig_as; /* autonomous system number */ + uint16_t ig_ni; /* number of subnet in local net */ + uint16_t ig_ns; /* number of networks in AS */ + uint16_t ig_nx; /* number of networks ouside AS */ + uint16_t ig_sum; /* checksum of IGRP header & data */ +}; + +#define IGRP_UPDATE 1 +#define IGRP_REQUEST 2 + +/* IGRP routing entry */ + +struct igrprte { + uint8_t igr_net[3]; /* 3 significant octets of IP address */ + uint8_t igr_dly[3]; /* delay in tens of microseconds */ + uint8_t igr_bw[3]; /* bandwidth in units of 1 kb/s */ + uint8_t igr_mtu[2]; /* MTU in octets */ + uint8_t igr_rel; /* percent packets successfully tx/rx */ + uint8_t igr_ld; /* percent of channel occupied */ + uint8_t igr_hct; /* hop count */ +}; + +#define IGRP_RTE_SIZE 14 /* don't believe sizeof ! */ + +static void +igrp_entry_print(netdissect_options *ndo, register const struct igrprte *igr, + register int is_interior, register int is_exterior) +{ + register u_int delay, bandwidth; + u_int metric, mtu; + + if (is_interior) + ND_PRINT((ndo, " *.%d.%d.%d", igr->igr_net[0], + igr->igr_net[1], igr->igr_net[2])); + else if (is_exterior) + ND_PRINT((ndo, " X%d.%d.%d.0", igr->igr_net[0], + igr->igr_net[1], igr->igr_net[2])); + else + ND_PRINT((ndo, " %d.%d.%d.0", igr->igr_net[0], + igr->igr_net[1], igr->igr_net[2])); + + delay = EXTRACT_24BITS(igr->igr_dly); + bandwidth = EXTRACT_24BITS(igr->igr_bw); + metric = bandwidth + delay; + if (metric > 0xffffff) + metric = 0xffffff; + mtu = EXTRACT_16BITS(igr->igr_mtu); + + ND_PRINT((ndo, " d=%d b=%d r=%d l=%d M=%d mtu=%d in %d hops", + 10 * delay, bandwidth == 0 ? 0 : 10000000 / bandwidth, + igr->igr_rel, igr->igr_ld, metric, + mtu, igr->igr_hct)); +} + +static const struct tok op2str[] = { + { IGRP_UPDATE, "update" }, + { IGRP_REQUEST, "request" }, + { 0, NULL } +}; + +void +igrp_print(netdissect_options *ndo, register const u_char *bp, u_int length) +{ + register const struct igrphdr *hdr; + register const u_char *cp; + u_int nint, nsys, next; + + hdr = (const struct igrphdr *)bp; + cp = (const u_char *)(hdr + 1); + ND_PRINT((ndo, "igrp:")); + + /* Header */ + ND_TCHECK(*hdr); + nint = EXTRACT_16BITS(&hdr->ig_ni); + nsys = EXTRACT_16BITS(&hdr->ig_ns); + next = EXTRACT_16BITS(&hdr->ig_nx); + + ND_PRINT((ndo, " %s V%d edit=%d AS=%d (%d/%d/%d)", + tok2str(op2str, "op-#%d", IGRP_OP(hdr->ig_vop)), + IGRP_V(hdr->ig_vop), + hdr->ig_ed, + EXTRACT_16BITS(&hdr->ig_as), + nint, + nsys, + next)); + + length -= sizeof(*hdr); + while (length >= IGRP_RTE_SIZE) { + if (nint > 0) { + ND_TCHECK2(*cp, IGRP_RTE_SIZE); + igrp_entry_print(ndo, (const struct igrprte *)cp, 1, 0); + --nint; + } else if (nsys > 0) { + ND_TCHECK2(*cp, IGRP_RTE_SIZE); + igrp_entry_print(ndo, (const struct igrprte *)cp, 0, 0); + --nsys; + } else if (next > 0) { + ND_TCHECK2(*cp, IGRP_RTE_SIZE); + igrp_entry_print(ndo, (const struct igrprte *)cp, 0, 1); + --next; + } else { + ND_PRINT((ndo, " [extra bytes %d]", length)); + break; + } + cp += IGRP_RTE_SIZE; + length -= IGRP_RTE_SIZE; + } + if (nint == 0 && nsys == 0 && next == 0) + return; +trunc: + ND_PRINT((ndo, " [|igrp]")); +} |