482 lines
17 KiB
C
482 lines
17 KiB
C
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/*
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* Copyright (c) 1998-2004 Hannes Gredler <hannes@tcpdump.org>
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* The TCPDUMP project
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code
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* distributions retain the above copyright notice and this paragraph
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* in its entirety, and (2) distributions including binary code include
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* the above copyright notice and this paragraph in its entirety in
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* the documentation or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
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* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
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* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/tcpdump/print-eigrp.c,v 1.5 2004/05/12 22:22:40 hannes Exp $";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "interface.h"
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#include "extract.h"
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#include "addrtoname.h"
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/*
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* packet format documented at
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* http://www.rhyshaden.com/eigrp.htm
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*/
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struct eigrp_common_header {
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u_int8_t version;
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u_int8_t opcode;
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u_int8_t checksum[2];
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u_int8_t flags[4];
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u_int8_t seq[4];
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u_int8_t ack[4];
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u_int8_t asn[4];
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};
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#define EIGRP_VERSION 2
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#define EIGRP_OPCODE_UPDATE 1
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#define EIGRP_OPCODE_QUERY 3
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#define EIGRP_OPCODE_REPLY 4
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#define EIGRP_OPCODE_HELLO 5
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#define EIGRP_OPCODE_IPXSAP 6
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#define EIGRP_OPCODE_PROBE 7
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static const struct tok eigrp_opcode_values[] = {
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{ EIGRP_OPCODE_UPDATE, "Update" },
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{ EIGRP_OPCODE_QUERY, "Query" },
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{ EIGRP_OPCODE_REPLY, "Reply" },
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{ EIGRP_OPCODE_HELLO, "Hello" },
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{ EIGRP_OPCODE_IPXSAP, "IPX SAP" },
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{ EIGRP_OPCODE_PROBE, "Probe" },
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{ 0, NULL}
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};
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static const struct tok eigrp_common_header_flag_values[] = {
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{ 0x01, "Init" },
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{ 0x02, "Conditionally Received" },
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{ 0, NULL}
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};
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struct eigrp_tlv_header {
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u_int8_t type[2];
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u_int8_t length[2];
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};
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#define EIGRP_TLV_GENERAL_PARM 0x0001
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#define EIGRP_TLV_AUTH 0x0002
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#define EIGRP_TLV_SEQ 0x0003
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#define EIGRP_TLV_SW_VERSION 0x0004
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#define EIGRP_TLV_MCAST_SEQ 0x0005
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#define EIGRP_TLV_IP_INT 0x0102
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#define EIGRP_TLV_IP_EXT 0x0103
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#define EIGRP_TLV_AT_INT 0x0202
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#define EIGRP_TLV_AT_EXT 0x0203
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#define EIGRP_TLV_AT_CABLE_SETUP 0x0204
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#define EIGRP_TLV_IPX_INT 0x0302
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#define EIGRP_TLV_IPX_EXT 0x0303
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static const struct tok eigrp_tlv_values[] = {
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{ EIGRP_TLV_GENERAL_PARM, "General Parameters"},
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{ EIGRP_TLV_AUTH, "Authentication"},
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{ EIGRP_TLV_SEQ, "Sequence"},
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{ EIGRP_TLV_SW_VERSION, "Software Version"},
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{ EIGRP_TLV_MCAST_SEQ, "Next Multicast Sequence"},
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{ EIGRP_TLV_IP_INT, "IP Internal routes"},
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{ EIGRP_TLV_IP_EXT, "IP External routes"},
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{ EIGRP_TLV_AT_INT, "AppleTalk Internal routes"},
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{ EIGRP_TLV_AT_EXT, "AppleTalk External routes"},
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{ EIGRP_TLV_AT_CABLE_SETUP, "AppleTalk Cable setup"},
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{ EIGRP_TLV_IPX_INT, "IPX Internal routes"},
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{ EIGRP_TLV_IPX_EXT, "IPX External routes"},
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{ 0, NULL}
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};
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struct eigrp_tlv_general_parm_t {
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u_int8_t k1;
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u_int8_t k2;
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u_int8_t k3;
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u_int8_t k4;
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u_int8_t k5;
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u_int8_t res;
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u_int8_t holdtime[2];
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};
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struct eigrp_tlv_sw_version_t {
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u_int8_t ios_major;
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u_int8_t ios_minor;
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u_int8_t eigrp_major;
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u_int8_t eigrp_minor;
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};
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struct eigrp_tlv_ip_int_t {
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u_int8_t nexthop[4];
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u_int8_t delay[4];
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u_int8_t bandwidth[4];
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u_int8_t mtu[3];
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u_int8_t hopcount;
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u_int8_t reliability;
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u_int8_t load;
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u_int8_t reserved[2];
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u_int8_t plen;
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u_int8_t destination; /* variable length [1-4] bytes encoding */
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};
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struct eigrp_tlv_ip_ext_t {
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u_int8_t nexthop[4];
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u_int8_t origin_router[4];
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u_int8_t origin_as[4];
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u_int8_t tag[4];
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u_int8_t metric[4];
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u_int8_t reserved[2];
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u_int8_t proto_id;
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u_int8_t flags;
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u_int8_t delay[4];
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u_int8_t bandwidth[4];
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u_int8_t mtu[3];
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u_int8_t hopcount;
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u_int8_t reliability;
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u_int8_t load;
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u_int8_t reserved2[2];
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u_int8_t plen;
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u_int8_t destination; /* variable length [1-4] bytes encoding */
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};
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struct eigrp_tlv_at_cable_setup_t {
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u_int8_t cable_start[2];
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u_int8_t cable_end[2];
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u_int8_t router_id[4];
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};
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struct eigrp_tlv_at_int_t {
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u_int8_t nexthop[4];
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u_int8_t delay[4];
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u_int8_t bandwidth[4];
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u_int8_t mtu[3];
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u_int8_t hopcount;
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u_int8_t reliability;
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u_int8_t load;
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u_int8_t reserved[2];
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u_int8_t cable_start[2];
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u_int8_t cable_end[2];
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};
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struct eigrp_tlv_at_ext_t {
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u_int8_t nexthop[4];
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u_int8_t origin_router[4];
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u_int8_t origin_as[4];
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u_int8_t tag[4];
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u_int8_t proto_id;
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u_int8_t flags;
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u_int8_t metric[2];
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u_int8_t delay[4];
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u_int8_t bandwidth[4];
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u_int8_t mtu[3];
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u_int8_t hopcount;
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u_int8_t reliability;
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u_int8_t load;
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u_int8_t reserved2[2];
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u_int8_t cable_start[2];
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u_int8_t cable_end[2];
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};
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static const struct tok eigrp_ext_proto_id_values[] = {
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{ 0x01, "IGRP" },
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{ 0x02, "EIGRP" },
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{ 0x03, "Static" },
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{ 0x04, "RIP" },
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{ 0x05, "Hello" },
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{ 0x06, "OSPF" },
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{ 0x07, "IS-IS" },
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{ 0x08, "EGP" },
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{ 0x09, "BGP" },
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{ 0x0a, "IDRP" },
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{ 0x0b, "Connected" },
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{ 0, NULL}
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};
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void
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eigrp_print(register const u_char *pptr, register u_int len) {
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const struct eigrp_common_header *eigrp_com_header;
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const struct eigrp_tlv_header *eigrp_tlv_header;
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const u_char *tptr,*tlv_tptr;
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int tlen,eigrp_tlv_len,eigrp_tlv_type,tlv_tlen,byte_length, bit_length;
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u_int8_t prefix[4];
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union {
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const struct eigrp_tlv_general_parm_t *eigrp_tlv_general_parm;
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const struct eigrp_tlv_sw_version_t *eigrp_tlv_sw_version;
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const struct eigrp_tlv_ip_int_t *eigrp_tlv_ip_int;
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const struct eigrp_tlv_ip_ext_t *eigrp_tlv_ip_ext;
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const struct eigrp_tlv_at_cable_setup_t *eigrp_tlv_at_cable_setup;
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const struct eigrp_tlv_at_int_t *eigrp_tlv_at_int;
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const struct eigrp_tlv_at_ext_t *eigrp_tlv_at_ext;
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} tlv_ptr;
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tptr=pptr;
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eigrp_com_header = (const struct eigrp_common_header *)pptr;
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TCHECK(*eigrp_com_header);
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/*
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* Sanity checking of the header.
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*/
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if (eigrp_com_header->version != EIGRP_VERSION) {
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printf("EIGRP version %u packet not supported",eigrp_com_header->version);
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return;
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}
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/* in non-verbose mode just lets print the basic Message Type*/
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if (vflag < 1) {
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printf("EIGRP %s, length: %u",
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tok2str(eigrp_opcode_values, "unknown (%u)",eigrp_com_header->opcode),
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len);
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return;
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}
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/* ok they seem to want to know everything - lets fully decode it */
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tlen=len-sizeof(struct eigrp_common_header);
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/* FIXME print other header info */
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printf("\n\tEIGRP v%u, opcode: %s (%u), chksum: 0x%04x, Flags: [%s]\n\tseq: 0x%08x, ack: 0x%08x, AS: %u, length: %u",
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eigrp_com_header->version,
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tok2str(eigrp_opcode_values, "unknown, type: %u",eigrp_com_header->opcode),
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eigrp_com_header->opcode,
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EXTRACT_16BITS(&eigrp_com_header->checksum),
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tok2str(eigrp_common_header_flag_values,
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"none",
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EXTRACT_32BITS(&eigrp_com_header->flags)),
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EXTRACT_32BITS(&eigrp_com_header->seq),
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EXTRACT_32BITS(&eigrp_com_header->ack),
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EXTRACT_32BITS(&eigrp_com_header->asn),
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tlen);
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tptr+=sizeof(const struct eigrp_common_header);
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while(tlen>0) {
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/* did we capture enough for fully decoding the object header ? */
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if (!TTEST2(*tptr, sizeof(struct eigrp_tlv_header)))
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goto trunc;
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eigrp_tlv_header = (const struct eigrp_tlv_header *)tptr;
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eigrp_tlv_len=EXTRACT_16BITS(&eigrp_tlv_header->length);
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eigrp_tlv_type=EXTRACT_16BITS(&eigrp_tlv_header->type);
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if (eigrp_tlv_len == 0 || eigrp_tlv_len > tlen) {
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print_unknown_data(tptr+sizeof(sizeof(struct eigrp_tlv_header)),"\n\t ",tlen);
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return;
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}
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printf("\n\t %s TLV (0x%04x), length: %u",
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tok2str(eigrp_tlv_values,
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"Unknown",
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eigrp_tlv_type),
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eigrp_tlv_type,
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eigrp_tlv_len);
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tlv_tptr=tptr+sizeof(struct eigrp_tlv_header);
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tlv_tlen=eigrp_tlv_len-sizeof(struct eigrp_tlv_header);
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/* did we capture enough for fully decoding the object ? */
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if (!TTEST2(*tptr, eigrp_tlv_len))
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goto trunc;
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switch(eigrp_tlv_type) {
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case EIGRP_TLV_GENERAL_PARM:
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tlv_ptr.eigrp_tlv_general_parm = (const struct eigrp_tlv_general_parm_t *)tlv_tptr;
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printf("\n\t holdtime: %us, k1 %u, k2 %u, k3 %u, k4 %u, k5 %u",
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EXTRACT_16BITS(tlv_ptr.eigrp_tlv_general_parm->holdtime),
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tlv_ptr.eigrp_tlv_general_parm->k1,
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tlv_ptr.eigrp_tlv_general_parm->k2,
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tlv_ptr.eigrp_tlv_general_parm->k3,
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tlv_ptr.eigrp_tlv_general_parm->k4,
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tlv_ptr.eigrp_tlv_general_parm->k5);
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break;
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case EIGRP_TLV_SW_VERSION:
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tlv_ptr.eigrp_tlv_sw_version = (const struct eigrp_tlv_sw_version_t *)tlv_tptr;
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printf("\n\t IOS version: %u.%u, EIGRP version %u.%u",
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tlv_ptr.eigrp_tlv_sw_version->ios_major,
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tlv_ptr.eigrp_tlv_sw_version->ios_minor,
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tlv_ptr.eigrp_tlv_sw_version->eigrp_major,
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tlv_ptr.eigrp_tlv_sw_version->eigrp_minor);
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break;
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case EIGRP_TLV_IP_INT:
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tlv_ptr.eigrp_tlv_ip_int = (const struct eigrp_tlv_ip_int_t *)tlv_tptr;
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bit_length = tlv_ptr.eigrp_tlv_ip_int->plen;
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if (bit_length < 0 || bit_length > 32) {
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printf("\n\t illegal prefix length %u",bit_length);
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break;
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}
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||
|
|
byte_length = (bit_length + 7) / 8; /* variable length encoding */
|
||
|
|
memset(prefix, 0, 4);
|
||
|
|
memcpy(prefix,&tlv_ptr.eigrp_tlv_ip_int->destination,byte_length);
|
||
|
|
|
||
|
|
printf("\n\t IPv4 prefix: %15s/%u, nexthop: ",
|
||
|
|
ipaddr_string(prefix),
|
||
|
|
bit_length);
|
||
|
|
if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->nexthop) == 0)
|
||
|
|
printf("self");
|
||
|
|
else
|
||
|
|
printf("%s",ipaddr_string(EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->nexthop)));
|
||
|
|
|
||
|
|
printf("\n\t delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
|
||
|
|
(EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->delay)/100),
|
||
|
|
EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->bandwidth),
|
||
|
|
EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_ip_int->mtu),
|
||
|
|
tlv_ptr.eigrp_tlv_ip_int->hopcount,
|
||
|
|
tlv_ptr.eigrp_tlv_ip_int->reliability,
|
||
|
|
tlv_ptr.eigrp_tlv_ip_int->load);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case EIGRP_TLV_IP_EXT:
|
||
|
|
tlv_ptr.eigrp_tlv_ip_ext = (const struct eigrp_tlv_ip_ext_t *)tlv_tptr;
|
||
|
|
|
||
|
|
bit_length = tlv_ptr.eigrp_tlv_ip_ext->plen;
|
||
|
|
if (bit_length < 0 || bit_length > 32) {
|
||
|
|
printf("\n\t illegal prefix length %u",bit_length);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
byte_length = (bit_length + 7) / 8; /* variable length encoding */
|
||
|
|
memset(prefix, 0, 4);
|
||
|
|
memcpy(prefix,&tlv_ptr.eigrp_tlv_ip_ext->destination,byte_length);
|
||
|
|
|
||
|
|
printf("\n\t IPv4 prefix: %15s/%u, nexthop: ",
|
||
|
|
ipaddr_string(prefix),
|
||
|
|
bit_length);
|
||
|
|
if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->nexthop) == 0)
|
||
|
|
printf("self");
|
||
|
|
else
|
||
|
|
printf("%s",ipaddr_string(EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->nexthop)));
|
||
|
|
|
||
|
|
printf("\n\t origin-router %s, origin-as %u, origin-proto %s, flags [0x%02x], tag 0x%08x, metric %u",
|
||
|
|
ipaddr_string(tlv_ptr.eigrp_tlv_ip_ext->origin_router),
|
||
|
|
EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->origin_as),
|
||
|
|
tok2str(eigrp_ext_proto_id_values,"unknown",tlv_ptr.eigrp_tlv_ip_ext->proto_id),
|
||
|
|
tlv_ptr.eigrp_tlv_ip_ext->flags,
|
||
|
|
EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->tag),
|
||
|
|
EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->metric));
|
||
|
|
|
||
|
|
printf("\n\t delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
|
||
|
|
(EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->delay)/100),
|
||
|
|
EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->bandwidth),
|
||
|
|
EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_ip_ext->mtu),
|
||
|
|
tlv_ptr.eigrp_tlv_ip_ext->hopcount,
|
||
|
|
tlv_ptr.eigrp_tlv_ip_ext->reliability,
|
||
|
|
tlv_ptr.eigrp_tlv_ip_ext->load);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case EIGRP_TLV_AT_CABLE_SETUP:
|
||
|
|
tlv_ptr.eigrp_tlv_at_cable_setup = (const struct eigrp_tlv_at_cable_setup_t *)tlv_tptr;
|
||
|
|
|
||
|
|
printf("\n\t Cable-range: %u-%u, Router-ID %u",
|
||
|
|
EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->cable_start),
|
||
|
|
EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->cable_end),
|
||
|
|
EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->router_id));
|
||
|
|
break;
|
||
|
|
|
||
|
|
case EIGRP_TLV_AT_INT:
|
||
|
|
tlv_ptr.eigrp_tlv_at_int = (const struct eigrp_tlv_at_int_t *)tlv_tptr;
|
||
|
|
|
||
|
|
printf("\n\t Cable-Range: %u-%u, nexthop: ",
|
||
|
|
EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->cable_start),
|
||
|
|
EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->cable_end));
|
||
|
|
|
||
|
|
if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop) == 0)
|
||
|
|
printf("self");
|
||
|
|
else
|
||
|
|
printf("%u.%u",
|
||
|
|
EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop),
|
||
|
|
EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop[2]));
|
||
|
|
|
||
|
|
printf("\n\t delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
|
||
|
|
(EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->delay)/100),
|
||
|
|
EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->bandwidth),
|
||
|
|
EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_at_int->mtu),
|
||
|
|
tlv_ptr.eigrp_tlv_at_int->hopcount,
|
||
|
|
tlv_ptr.eigrp_tlv_at_int->reliability,
|
||
|
|
tlv_ptr.eigrp_tlv_at_int->load);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case EIGRP_TLV_AT_EXT:
|
||
|
|
tlv_ptr.eigrp_tlv_at_ext = (const struct eigrp_tlv_at_ext_t *)tlv_tptr;
|
||
|
|
|
||
|
|
printf("\n\t Cable-Range: %u-%u, nexthop: ",
|
||
|
|
EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->cable_start),
|
||
|
|
EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->cable_end));
|
||
|
|
|
||
|
|
if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop) == 0)
|
||
|
|
printf("self");
|
||
|
|
else
|
||
|
|
printf("%u.%u",
|
||
|
|
EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop),
|
||
|
|
EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop[2]));
|
||
|
|
|
||
|
|
printf("\n\t origin-router %u, origin-as %u, origin-proto %s, flags [0x%02x], tag 0x%08x, metric %u",
|
||
|
|
EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->origin_router),
|
||
|
|
EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->origin_as),
|
||
|
|
tok2str(eigrp_ext_proto_id_values,"unknown",tlv_ptr.eigrp_tlv_at_ext->proto_id),
|
||
|
|
tlv_ptr.eigrp_tlv_at_ext->flags,
|
||
|
|
EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->tag),
|
||
|
|
EXTRACT_16BITS(tlv_ptr.eigrp_tlv_at_ext->metric));
|
||
|
|
|
||
|
|
printf("\n\t delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
|
||
|
|
(EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->delay)/100),
|
||
|
|
EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->bandwidth),
|
||
|
|
EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_at_ext->mtu),
|
||
|
|
tlv_ptr.eigrp_tlv_at_ext->hopcount,
|
||
|
|
tlv_ptr.eigrp_tlv_at_ext->reliability,
|
||
|
|
tlv_ptr.eigrp_tlv_at_ext->load);
|
||
|
|
break;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* FIXME those are the defined TLVs that lack a decoder
|
||
|
|
* you are welcome to contribute code ;-)
|
||
|
|
*/
|
||
|
|
|
||
|
|
case EIGRP_TLV_AUTH:
|
||
|
|
case EIGRP_TLV_SEQ:
|
||
|
|
case EIGRP_TLV_MCAST_SEQ:
|
||
|
|
case EIGRP_TLV_IPX_INT:
|
||
|
|
case EIGRP_TLV_IPX_EXT:
|
||
|
|
|
||
|
|
default:
|
||
|
|
if (vflag <= 1)
|
||
|
|
print_unknown_data(tlv_tptr,"\n\t ",tlv_tlen);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
/* do we want to see an additionally hexdump ? */
|
||
|
|
if (vflag > 1)
|
||
|
|
print_unknown_data(tptr+sizeof(sizeof(struct eigrp_tlv_header)),"\n\t ",
|
||
|
|
eigrp_tlv_len-sizeof(struct eigrp_tlv_header));
|
||
|
|
|
||
|
|
tptr+=eigrp_tlv_len;
|
||
|
|
tlen-=eigrp_tlv_len;
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
trunc:
|
||
|
|
printf("\n\t\t packet exceeded snapshot");
|
||
|
|
}
|