681 lines
15 KiB
C
681 lines
15 KiB
C
/*
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* Copyright (c) 1992, 1993, 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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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 distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Original code by Matt Thomas, Digital Equipment Corporation
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*
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* $FreeBSD$
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.16 1999/11/21 09:36:55 fenner Exp $ (LBL)";
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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 <sys/types.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#if __STDC__
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struct mbuf;
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struct rtentry;
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#endif
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#include <net/if.h>
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#include <netinet/in.h>
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#include <net/ethernet.h>
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#include <stdio.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "ethertype.h"
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#include "extract.h"
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#define NLPID_CLNS 129 /* 0x81 */
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#define NLPID_ESIS 130 /* 0x82 */
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#define NLPID_ISIS 131 /* 0x83 */
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#define NLPID_NULLNS 0
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/*
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* IS-IS is defined in ISO 10589. Look there for protocol definitions.
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*/
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#define SYSTEM_ID_LEN sizeof(struct ether_addr)
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#define ISIS_VERSION 1
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#define PDU_TYPE_MASK 0x1F
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#define PRIORITY_MASK 0x7F
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#define L1_LAN_IIH 15
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#define L2_LAN_IIH 16
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#define PTP_IIH 17
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#define L1_LS_PDU 18
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#define L2_LS_PDU 19
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#define L1_COMPLETE_SEQ_PDU 24
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#define L2_COMPLETE_SEQ_PDU 25
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/*
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* A TLV is a tuple of a type, length and a value and is normally used for
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* encoding information in all sorts of places. This is an enumeration of
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* the well known types.
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*/
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#define TLV_AREA_ADDR 1
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#define TLV_IS_REACH 2
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#define TLV_ES_REACH 3
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#define TLV_SUMMARY 5
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#define TLV_ISNEIGH 6
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#define TLV_PADDING 8
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#define TLV_LSP 9
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#define TLV_AUTHENT 10
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#define TLV_IP_REACH 128
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#define TLV_PROTOCOLS 129
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#define TLV_IP_EXTERN 130
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#define TLV_IDRP_INFO 131
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#define TLV_IPADDR 132
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#define TLV_IPAUTH 133
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#define TLV_PTP_ADJ 240
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/*
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* Katz's point to point adjacency TLV uses codes to tell us the state of
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* the remote adjacency. Enumerate them.
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*/
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#define ISIS_PTP_ADJ_UP 0
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#define ISIS_PTP_ADJ_INIT 1
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#define ISIS_PTP_ADJ_DOWN 2
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static int osi_cksum(const u_char *, int, u_char *);
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static void esis_print(const u_char *, u_int);
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static int isis_print(const u_char *, u_int);
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struct isis_ptp_adjancey_values {
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u_char id;
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char *name;
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};
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static struct isis_ptp_adjancey_values isis_ptp_adjancey_values[] = {
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ISIS_PTP_ADJ_UP, "UP",
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ISIS_PTP_ADJ_INIT, "INIT",
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ISIS_PTP_ADJ_DOWN, "DOWN"
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};
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struct isis_common_header {
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u_char nlpid;
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u_char fixed_len;
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u_char version; /* Protocol version? */
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u_char id_length;
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u_char enc_pdu_type; /* 3 MSbs are reserved */
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u_char pkt_version; /* Packet format version? */
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u_char reserved;
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u_char enc_max_area;
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};
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struct isis_header {
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u_char nlpid;
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u_char fixed_len;
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u_char version; /* Protocol version? */
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u_char id_length;
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u_char enc_pdu_type; /* 3 MSbs are reserved */
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u_char pkt_version; /* Packet format version? */
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u_char reserved;
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u_char enc_max_area;
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u_char circuit;
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u_char enc_source_id[SYSTEM_ID_LEN];
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u_char enc_holding_time[2];
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u_char enc_packet_len[2];
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u_char enc_priority;
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u_char enc_lan_id[SYSTEM_ID_LEN+1];
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};
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struct isis_lan_header {
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u_char circuit;
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u_char enc_source_id[SYSTEM_ID_LEN];
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u_char enc_holding_time[2];
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u_char enc_packet_len[2];
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u_char enc_priority;
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u_char enc_lan_id[SYSTEM_ID_LEN+1];
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};
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struct isis_ptp_header {
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u_char circuit;
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u_char enc_source_id[SYSTEM_ID_LEN];
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u_char enc_holding_time[2];
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u_char enc_packet_len[2];
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u_char loc_circuit_id;
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};
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#define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header))
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#define ISIS_HEADER_SIZE (15+(SYSTEM_ID_LEN<<1))
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#define ISIS_PTP_HEADER_SIZE (14+SYSTEM_ID_LEN)
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#define L1_LS_PDU_HEADER_SIZE (21+SYSTEM_ID_LEN)
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#define L2_LS_PDU_HEADER_SIZE L1_LS_PDU_HEADER_SIZE
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#define L1_COMPLETE_SEQ_PDU_HEADER_SIZE 33
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#define L2_COMPLETE_SEQ_PDU_HEADER_SIZE L1_COMPLETE_SEQ_PDU_HEADER_SIZE
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void
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isoclns_print(const u_char *p, u_int length, u_int caplen,
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const u_char *esrc, const u_char *edst)
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{
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u_char pdu_type;
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struct isis_header *header;
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header = (struct isis_header *)p;
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pdu_type = header->enc_pdu_type & PDU_TYPE_MASK;
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if (caplen < 1) {
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printf("[|iso-clns] ");
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if (!eflag)
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printf("%s > %s",
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etheraddr_string(esrc),
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etheraddr_string(edst));
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return;
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}
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switch (*p) {
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case NLPID_CLNS:
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printf("iso clns");
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if (!eflag)
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(void)printf(" %s > %s",
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etheraddr_string(esrc),
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etheraddr_string(edst));
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break;
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case NLPID_ESIS:
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printf("iso esis");
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if (!eflag)
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(void)printf(" %s > %s",
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etheraddr_string(esrc),
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etheraddr_string(edst));
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esis_print(p, length);
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return;
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case NLPID_ISIS:
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printf("iso isis");
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if (!eflag) {
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if(pdu_type != PTP_IIH)
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(void)printf(" %s > %s",
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etheraddr_string(esrc),
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etheraddr_string(edst));
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}
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(void)printf(" len=%d ", length);
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if (!isis_print(p, length))
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default_print_unaligned(p, caplen);
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break;
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case NLPID_NULLNS:
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printf("iso nullns");
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if (!eflag)
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(void)printf(" %s > %s",
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etheraddr_string(esrc),
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etheraddr_string(edst));
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break;
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default:
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printf("iso clns %02x", p[0]);
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if (!eflag)
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(void)printf(" %s > %s",
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etheraddr_string(esrc),
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etheraddr_string(edst));
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(void)printf(" len=%d ", length);
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if (caplen > 1)
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default_print_unaligned(p, caplen);
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break;
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}
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}
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#define ESIS_REDIRECT 6
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#define ESIS_ESH 2
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#define ESIS_ISH 4
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struct esis_hdr {
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u_char version;
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u_char reserved;
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u_char type;
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u_char tmo[2];
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u_char cksum[2];
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};
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static void
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esis_print(const u_char *p, u_int length)
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{
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const u_char *ep;
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int li = p[1];
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const struct esis_hdr *eh = (const struct esis_hdr *) &p[2];
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u_char cksum[2];
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u_char off[2];
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if (length == 2) {
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if (qflag)
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printf(" bad pkt!");
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else
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printf(" no header at all!");
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return;
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}
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ep = p + li;
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if (li > length) {
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if (qflag)
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printf(" bad pkt!");
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else
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printf(" LI(%d) > PDU size (%d)!", li, length);
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return;
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}
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if (li < sizeof(struct esis_hdr) + 2) {
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if (qflag)
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printf(" bad pkt!");
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else {
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printf(" too short for esis header %d:", li);
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while (--length != 0)
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printf("%02X", *p++);
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}
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return;
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}
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switch (eh->type & 0x1f) {
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case ESIS_REDIRECT:
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printf(" redirect");
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break;
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case ESIS_ESH:
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printf(" esh");
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break;
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case ESIS_ISH:
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printf(" ish");
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break;
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default:
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printf(" type %d", eh->type & 0x1f);
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break;
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}
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off[0] = eh->cksum[0];
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off[1] = eh->cksum[1];
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if (vflag && osi_cksum(p, li, off)) {
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printf(" bad cksum (got %02x%02x)",
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eh->cksum[1], eh->cksum[0]);
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default_print(p, length);
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return;
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}
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if (eh->version != 1) {
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printf(" unsupported version %d", eh->version);
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return;
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}
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p += sizeof(*eh) + 2;
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li -= sizeof(*eh) + 2; /* protoid * li */
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switch (eh->type & 0x1f) {
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case ESIS_REDIRECT: {
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const u_char *dst, *snpa, *is;
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dst = p; p += *p + 1;
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if (p > snapend)
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return;
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printf("\n\t\t\t %s", isonsap_string(dst));
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snpa = p; p += *p + 1;
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is = p; p += *p + 1;
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if (p > snapend)
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return;
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if (p > ep) {
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printf(" [bad li]");
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return;
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}
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if (is[0] == 0)
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printf(" > %s", etheraddr_string(&snpa[1]));
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else
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printf(" > %s", isonsap_string(is));
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li = ep - p;
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break;
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}
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#if 0
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case ESIS_ESH:
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printf(" esh");
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break;
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#endif
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case ESIS_ISH: {
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const u_char *is;
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is = p; p += *p + 1;
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if (p > ep) {
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printf(" [bad li]");
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return;
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}
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if (p > snapend)
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return;
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if (!qflag)
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printf("\n\t\t\t %s", isonsap_string(is));
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li = ep - p;
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break;
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}
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default:
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(void)printf(" len=%d", length);
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if (length && p < snapend) {
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length = snapend - p;
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default_print(p, length);
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}
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return;
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}
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if (vflag)
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while (p < ep && li) {
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int op, opli;
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const u_char *q;
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if (snapend - p < 2)
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return;
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if (li < 2) {
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printf(" bad opts/li");
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return;
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}
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op = *p++;
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opli = *p++;
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li -= 2;
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if (opli > li) {
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printf(" opt (%d) too long", op);
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return;
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}
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li -= opli;
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q = p;
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p += opli;
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if (snapend < p)
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return;
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if (op == 198 && opli == 2) {
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printf(" tmo=%d", q[0] * 256 + q[1]);
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continue;
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}
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printf (" %d:<", op);
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while (--opli >= 0)
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printf("%02x", *q++);
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printf (">");
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}
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}
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/*
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* print_nsap
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* Print out an NSAP.
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*/
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void
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print_nsap (register const u_char *cp, register int length)
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{
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int i;
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for (i = 0; i < length; i++) {
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printf("%02x", *cp++);
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if (((i & 1) == 0) && (i + 1 < length)) {
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printf(".");
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}
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}
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}
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/*
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* isis_print
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* Decode IS-IS packets. Return 0 on error.
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*
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* So far, this is only smart enough to print IIH's. Someday...
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*/
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static int
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isis_print (const u_char *p, u_int length)
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{
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struct isis_header *header;
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struct isis_ptp_header *header_ptp;
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u_char pdu_type, max_area, priority, *pptr, type, len, *tptr, tmp, alen;
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u_short packet_len, holding_time;
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int i;
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header_ptp = (struct isis_ptp_header *)header = (struct isis_header *)p;
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printf("\n\t\t\t");
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/*
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* Sanity checking of the header.
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*/
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if (header->nlpid != NLPID_ISIS) {
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printf(" coding error!");
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return(0);
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}
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if (header->version != ISIS_VERSION) {
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printf(" version %d packet not supported", header->version);
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return(0);
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}
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if ((header->id_length != SYSTEM_ID_LEN) && (header->id_length != 0)) {
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printf(" system ID length of %d is not supported",
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header->id_length);
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return(0);
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}
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if ((header->fixed_len != ISIS_HEADER_SIZE) &&
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(header->fixed_len != ISIS_PTP_HEADER_SIZE) &&
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(header->fixed_len != L1_LS_PDU_HEADER_SIZE) &&
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(header-> fixed_len != L1_COMPLETE_SEQ_PDU_HEADER_SIZE) ) {
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printf(" bogus fixed header length",
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header->fixed_len);
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return(0);
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}
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pdu_type = header->enc_pdu_type & PDU_TYPE_MASK;
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if ((pdu_type != L1_LAN_IIH) && (pdu_type != L2_LAN_IIH) &&
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(pdu_type != PTP_IIH) &&
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(pdu_type != L1_COMPLETE_SEQ_PDU) &&
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(pdu_type != L2_COMPLETE_SEQ_PDU) ) {
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printf(" PDU type (%d) not supported", pdu_type);
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return;
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}
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if (header->pkt_version != ISIS_VERSION) {
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printf(" version %d packet not supported", header->pkt_version);
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return;
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}
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max_area = header->enc_max_area;
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switch(max_area) {
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case 0:
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max_area = 3; /* silly shit */
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break;
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case 255:
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printf(" bad packet -- 255 areas");
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return(0);
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default:
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break;
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}
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switch (header->circuit) {
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case 0:
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printf(" PDU with circuit type 0");
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return(0);
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case 1:
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if (pdu_type == L2_LAN_IIH) {
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printf(" L2 IIH on an L1 only circuit");
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return(0);
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}
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break;
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case 2:
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if (pdu_type == L1_LAN_IIH) {
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printf(" L1 IIH on an L2 only circuit");
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return(0);
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}
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break;
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case 3:
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break;
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default:
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printf(" unknown circuit type");
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return(0);
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}
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holding_time = EXTRACT_16BITS(header->enc_holding_time);
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packet_len = EXTRACT_16BITS(header->enc_packet_len);
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if ((packet_len < ISIS_HEADER_SIZE) ||
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(packet_len > length)) {
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printf(" bogus packet length %d, real length %d", packet_len,
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length);
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return(0);
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}
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if(pdu_type != PTP_IIH)
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priority = header->enc_priority & PRIORITY_MASK;
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/*
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* Now print the fixed header.
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*/
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switch (pdu_type) {
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case L1_LAN_IIH:
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printf(" L1 lan iih, ");
|
|
break;
|
|
case L2_LAN_IIH:
|
|
printf(" L2 lan iih, ");
|
|
break;
|
|
case PTP_IIH:
|
|
printf(" PTP iih, ");
|
|
break;
|
|
}
|
|
|
|
printf("circuit ");
|
|
switch (header->circuit) {
|
|
case 1:
|
|
printf("l1 only, ");
|
|
break;
|
|
case 2:
|
|
printf("l2 only, ");
|
|
break;
|
|
case 3:
|
|
printf("l1-l2, ");
|
|
break;
|
|
}
|
|
|
|
printf ("holding time %d ", holding_time);
|
|
printf ("\n\t\t\t source %s, length %d",
|
|
etheraddr_string(header->enc_source_id), packet_len);
|
|
if((pdu_type==L1_LAN_IIH)||(pdu_type==L2_LAN_IIH))
|
|
printf ("\n\t\t\t lan id %s(%d)", etheraddr_string(header->enc_lan_id),
|
|
header->enc_lan_id[SYSTEM_ID_LEN]);
|
|
|
|
/*
|
|
* Now print the TLV's.
|
|
*/
|
|
if(pdu_type==PTP_IIH) {
|
|
packet_len -= ISIS_PTP_HEADER_SIZE;
|
|
pptr = (char *)p + ISIS_PTP_HEADER_SIZE;
|
|
} else {
|
|
packet_len -= ISIS_HEADER_SIZE;
|
|
pptr = (char *)p + ISIS_HEADER_SIZE;
|
|
}
|
|
while (packet_len >= 2) {
|
|
if (pptr >= snapend) {
|
|
printf("\n\t\t\t packet exceeded snapshot");
|
|
return(1);
|
|
}
|
|
type = *pptr++;
|
|
len = *pptr++;
|
|
packet_len -= 2;
|
|
if (len > packet_len) {
|
|
break;
|
|
}
|
|
|
|
switch (type) {
|
|
case TLV_AREA_ADDR:
|
|
printf("\n\t\t\t area addresses");
|
|
tmp = len;
|
|
tptr = pptr;
|
|
alen = *tptr++;
|
|
while (tmp && alen < tmp) {
|
|
printf("\n\t\t\t ");
|
|
print_nsap(tptr, alen);
|
|
printf(" (%d)", alen);
|
|
tptr += alen;
|
|
tmp -= alen + 1;
|
|
alen = *tptr++;
|
|
}
|
|
break;
|
|
case TLV_ISNEIGH:
|
|
printf("\n\t\t\t neighbor addresses");
|
|
tmp = len;
|
|
tptr = pptr;
|
|
while (tmp >= sizeof(struct ether_addr)) {
|
|
printf("\n\t\t\t %s", etheraddr_string(tptr));
|
|
tmp -= sizeof(struct ether_addr);
|
|
tptr += sizeof(struct ether_addr);
|
|
}
|
|
break;
|
|
case TLV_PADDING:
|
|
printf("\n\t\t\t padding for %d bytes", len);
|
|
break;
|
|
case TLV_AUTHENT:
|
|
printf("\n\t\t\t authentication data");
|
|
default_print(pptr, len);
|
|
break;
|
|
case TLV_PTP_ADJ:
|
|
printf("\n\t\t\t PTP adjacency status %s",
|
|
isis_ptp_adjancey_values[*pptr].name);
|
|
break;
|
|
case TLV_PROTOCOLS:
|
|
printf("\n\t\t\t Supports protocols %s", (len>1)? "are":"is");
|
|
for(i=0;i<len;i++)
|
|
printf(" %02X", (u_char)*(pptr+i));
|
|
break;
|
|
case TLV_IPADDR:
|
|
printf("\n\t\t\t IP address: %s", ipaddr_string(pptr));
|
|
break;
|
|
default:
|
|
printf("\n\t\t\t unknown TLV, type %d, length %d", type, len);
|
|
break;
|
|
}
|
|
|
|
pptr += len;
|
|
packet_len -= len;
|
|
}
|
|
|
|
if (packet_len != 0) {
|
|
printf("\n\t\t\t %d straggler bytes", packet_len);
|
|
}
|
|
return(1);
|
|
}
|
|
|
|
/*
|
|
* Verify the checksum. See 8473-1, Appendix C, section C.4.
|
|
*/
|
|
|
|
static int
|
|
osi_cksum(register const u_char *p, register int len, u_char *off)
|
|
{
|
|
int32_t c0 = 0, c1 = 0;
|
|
|
|
if ((off[0] == 0) && (off[1] == 0))
|
|
return 0;
|
|
|
|
off[0] = off[1] = 0;
|
|
while ((int)--len >= 0) {
|
|
c0 += *p++;
|
|
c0 %= 255;
|
|
c1 += c0;
|
|
c1 %= 255;
|
|
}
|
|
return (c0 | c1);
|
|
}
|