X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/a11713da52b0a72a1cb17f00fc339d332866e9ca..c39d40a767a1ae36171e5bcbf6f157ff3e80fb6c:/print-igrp.c diff --git a/print-igrp.c b/print-igrp.c index 2580ca5e..0efc78af 100644 --- a/print-igrp.c +++ b/print-igrp.c @@ -21,117 +21,129 @@ * Initial contribution from Francis Dupont (francis.dupont@inria.fr) */ -#ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-igrp.c,v 1.16 2001-06-15 22:17:32 fenner Exp $ (LBL)"; -#endif +/* \summary: Interior Gateway Routing Protocol (IGRP) printer */ #ifdef HAVE_CONFIG_H -#include "config.h" +#include #endif -#include -#include /* concession to AIX */ -#include +#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 ouside AS */ + nd_uint16_t ig_sum; /* checksum of IGRP header & data */ +}; + +#define IGRP_UPDATE 1 +#define IGRP_REQUEST 2 -#include +/* IGRP routing entry */ -#include -#include +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 */ +}; -#include "interface.h" -#include "addrtoname.h" -#include "igrp.h" -#include "ip.h" -#include "extract.h" /* must come after interface.h */ +#define IGRP_RTE_SIZE 14 /* sizeof() is accurate now */ static void -igrp_entry_print(register struct igrprte *igr, register int is_interior, - register int is_exterior) +igrp_entry_print(netdissect_options *ndo, const struct igrprte *igr) { - register u_int delay, bandwidth; + u_int delay, bandwidth; u_int metric, mtu; - if (is_interior) - printf(" *.%d.%d.%d", igr->igr_net[0], - igr->igr_net[1], igr->igr_net[2]); - else if (is_exterior) - printf(" X%d.%d.%d.0", igr->igr_net[0], - igr->igr_net[1], igr->igr_net[2]); - else - printf(" %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); - - printf(" d=%d b=%d r=%d l=%d M=%d mtu=%d in %d hops", + 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, - igr->igr_rel, igr->igr_ld, metric, - mtu, igr->igr_hct); + GET_U_1(igr->igr_rel), GET_U_1(igr->igr_ld), metric, + mtu, GET_U_1(igr->igr_hct)); } -static struct tok op2str[] = { +static const struct tok op2str[] = { { IGRP_UPDATE, "update" }, { IGRP_REQUEST, "request" }, { 0, NULL } }; void -igrp_print(register const u_char *bp, u_int length, register const u_char *bp2) +igrp_print(netdissect_options *ndo, const u_char *bp, u_int length) { - register struct igrphdr *hdr; - register struct ip *ip; - register u_char *cp; + const struct igrphdr *hdr; + const u_char *cp; u_int nint, nsys, next; + uint16_t cksum; - hdr = (struct igrphdr *)bp; - ip = (struct ip *)bp2; - cp = (u_char *)(hdr + 1); - (void)printf("igrp:"); + ndo->ndo_protocol = "igrp"; + hdr = (const struct igrphdr *)bp; + cp = (const u_char *)(hdr + 1); + ND_PRINT("igrp:"); /* Header */ - TCHECK(*hdr); - nint = EXTRACT_16BITS(&hdr->ig_ni); - nsys = EXTRACT_16BITS(&hdr->ig_ns); - next = EXTRACT_16BITS(&hdr->ig_nx); - - (void)printf(" %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 = 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) { - TCHECK2(*cp, IGRP_RTE_SIZE); - igrp_entry_print((struct igrprte *)cp, 1, 0); + ND_PRINT(" *.%u.%u.%u", net0, net1, net2); + igrp_entry_print(ndo, igr); --nint; } else if (nsys > 0) { - TCHECK2(*cp, IGRP_RTE_SIZE); - igrp_entry_print((struct igrprte *)cp, 0, 0); + ND_PRINT(" %u.%u.%u.0", net0, net1, net2); + igrp_entry_print(ndo, igr); --nsys; } else if (next > 0) { - TCHECK2(*cp, IGRP_RTE_SIZE); - igrp_entry_print((struct igrprte *)cp, 0, 1); + ND_PRINT(" X%u.%u.%u.0", net0, net1, net2); + igrp_entry_print(ndo, igr); --next; } else { - (void)printf(" [extra bytes %d]", length); + ND_PRINT(" [extra bytes %u]", length); break; } cp += IGRP_RTE_SIZE; length -= IGRP_RTE_SIZE; } - if (nint == 0 && nsys == 0 && next == 0) - return; -trunc: - fputs(" [|igrp]", stdout); + if (nint || nsys || next || length) + nd_print_invalid(ndo); }