681 lines
15 KiB
C
681 lines
15 KiB
C
/* $NetBSD: print-isoclns.c,v 1.2 2001/06/25 19:59:59 itojun Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1992, 1993, 1994, 1995, 1996
|
|
* 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.
|
|
*
|
|
* Original code by Matt Thomas, Digital Equipment Corporation
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
#if 0
|
|
static const char rcsid[] =
|
|
"@(#) Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.22 2000/10/11 04:04:33 guy Exp (LBL)";
|
|
#else
|
|
__RCSID("$NetBSD: print-isoclns.c,v 1.2 2001/06/25 19:59:59 itojun Exp $");
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.h"
|
|
#include "ethertype.h"
|
|
#include "ether.h"
|
|
#include "extract.h"
|
|
|
|
#define NLPID_CLNS 129 /* 0x81 */
|
|
#define NLPID_ESIS 130 /* 0x82 */
|
|
#define NLPID_ISIS 131 /* 0x83 */
|
|
#define NLPID_NULLNS 0
|
|
|
|
|
|
/*
|
|
* IS-IS is defined in ISO 10589. Look there for protocol definitions.
|
|
*/
|
|
|
|
#define SYSTEM_ID_LEN ETHER_ADDR_LEN
|
|
#define ISIS_VERSION 1
|
|
#define PDU_TYPE_MASK 0x1F
|
|
#define PRIORITY_MASK 0x7F
|
|
|
|
#define L1_LAN_IIH 15
|
|
#define L2_LAN_IIH 16
|
|
#define PTP_IIH 17
|
|
#define L1_LS_PDU 18
|
|
#define L2_LS_PDU 19
|
|
#define L1_COMPLETE_SEQ_PDU 24
|
|
#define L2_COMPLETE_SEQ_PDU 25
|
|
|
|
/*
|
|
* A TLV is a tuple of a type, length and a value and is normally used for
|
|
* encoding information in all sorts of places. This is an enumeration of
|
|
* the well known types.
|
|
*/
|
|
|
|
#define TLV_AREA_ADDR 1
|
|
#define TLV_IS_REACH 2
|
|
#define TLV_ES_REACH 3
|
|
#define TLV_SUMMARY 5
|
|
#define TLV_ISNEIGH 6
|
|
#define TLV_PADDING 8
|
|
#define TLV_LSP 9
|
|
#define TLV_AUTHENT 10
|
|
#define TLV_IP_REACH 128
|
|
#define TLV_PROTOCOLS 129
|
|
#define TLV_IP_EXTERN 130
|
|
#define TLV_IDRP_INFO 131
|
|
#define TLV_IPADDR 132
|
|
#define TLV_IPAUTH 133
|
|
#define TLV_PTP_ADJ 240
|
|
|
|
/*
|
|
* Katz's point to point adjacency TLV uses codes to tell us the state of
|
|
* the remote adjacency. Enumerate them.
|
|
*/
|
|
|
|
#define ISIS_PTP_ADJ_UP 0
|
|
#define ISIS_PTP_ADJ_INIT 1
|
|
#define ISIS_PTP_ADJ_DOWN 2
|
|
|
|
static int osi_cksum(const u_char *, int, u_char *);
|
|
static void esis_print(const u_char *, u_int);
|
|
static int isis_print(const u_char *, u_int);
|
|
|
|
|
|
struct isis_ptp_adjancey_values {
|
|
u_char id;
|
|
char *name;
|
|
};
|
|
|
|
static struct isis_ptp_adjancey_values isis_ptp_adjancey_values[] = {
|
|
{ ISIS_PTP_ADJ_UP, "UP" },
|
|
{ ISIS_PTP_ADJ_INIT, "INIT" },
|
|
{ ISIS_PTP_ADJ_DOWN, "DOWN" }
|
|
};
|
|
|
|
struct isis_common_header {
|
|
u_char nlpid;
|
|
u_char fixed_len;
|
|
u_char version; /* Protocol version? */
|
|
u_char id_length;
|
|
u_char enc_pdu_type; /* 3 MSbs are reserved */
|
|
u_char pkt_version; /* Packet format version? */
|
|
u_char reserved;
|
|
u_char enc_max_area;
|
|
};
|
|
|
|
struct isis_header {
|
|
u_char nlpid;
|
|
u_char fixed_len;
|
|
u_char version; /* Protocol version? */
|
|
u_char id_length;
|
|
u_char enc_pdu_type; /* 3 MSbs are reserved */
|
|
u_char pkt_version; /* Packet format version? */
|
|
u_char reserved;
|
|
u_char enc_max_area;
|
|
u_char circuit;
|
|
u_char enc_source_id[SYSTEM_ID_LEN];
|
|
u_char enc_holding_time[2];
|
|
u_char enc_packet_len[2];
|
|
u_char enc_priority;
|
|
u_char enc_lan_id[SYSTEM_ID_LEN+1];
|
|
};
|
|
struct isis_lan_header {
|
|
u_char circuit;
|
|
u_char enc_source_id[SYSTEM_ID_LEN];
|
|
u_char enc_holding_time[2];
|
|
u_char enc_packet_len[2];
|
|
u_char enc_priority;
|
|
u_char enc_lan_id[SYSTEM_ID_LEN+1];
|
|
};
|
|
|
|
struct isis_ptp_header {
|
|
u_char circuit;
|
|
u_char enc_source_id[SYSTEM_ID_LEN];
|
|
u_char enc_holding_time[2];
|
|
u_char enc_packet_len[2];
|
|
u_char loc_circuit_id;
|
|
};
|
|
|
|
#define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header))
|
|
#define ISIS_HEADER_SIZE (15+(SYSTEM_ID_LEN<<1))
|
|
#define ISIS_PTP_HEADER_SIZE (14+SYSTEM_ID_LEN)
|
|
#define L1_LS_PDU_HEADER_SIZE (21+SYSTEM_ID_LEN)
|
|
#define L2_LS_PDU_HEADER_SIZE L1_LS_PDU_HEADER_SIZE
|
|
#define L1_COMPLETE_SEQ_PDU_HEADER_SIZE 33
|
|
#define L2_COMPLETE_SEQ_PDU_HEADER_SIZE L1_COMPLETE_SEQ_PDU_HEADER_SIZE
|
|
|
|
|
|
|
|
void
|
|
isoclns_print(const u_char *p, u_int length, u_int caplen,
|
|
const u_char *esrc, const u_char *edst)
|
|
{
|
|
u_char pdu_type;
|
|
struct isis_header *header;
|
|
|
|
header = (struct isis_header *)p;
|
|
pdu_type = header->enc_pdu_type & PDU_TYPE_MASK;
|
|
|
|
if (caplen < 1) {
|
|
printf("[|iso-clns] ");
|
|
if (!eflag)
|
|
printf("%s > %s",
|
|
etheraddr_string(esrc),
|
|
etheraddr_string(edst));
|
|
return;
|
|
}
|
|
|
|
switch (*p) {
|
|
|
|
case NLPID_CLNS:
|
|
printf("iso clns");
|
|
if (!eflag)
|
|
(void)printf(" %s > %s",
|
|
etheraddr_string(esrc),
|
|
etheraddr_string(edst));
|
|
break;
|
|
|
|
case NLPID_ESIS:
|
|
printf("iso esis");
|
|
if (!eflag)
|
|
(void)printf(" %s > %s",
|
|
etheraddr_string(esrc),
|
|
etheraddr_string(edst));
|
|
esis_print(p, length);
|
|
return;
|
|
|
|
case NLPID_ISIS:
|
|
printf("iso isis");
|
|
if (!eflag) {
|
|
if(pdu_type != PTP_IIH)
|
|
(void)printf(" %s > %s",
|
|
etheraddr_string(esrc),
|
|
etheraddr_string(edst));
|
|
}
|
|
(void)printf(" len=%d ", length);
|
|
if (!isis_print(p, length))
|
|
default_print_unaligned(p, caplen);
|
|
break;
|
|
|
|
case NLPID_NULLNS:
|
|
printf("iso nullns");
|
|
if (!eflag)
|
|
(void)printf(" %s > %s",
|
|
etheraddr_string(esrc),
|
|
etheraddr_string(edst));
|
|
break;
|
|
|
|
default:
|
|
printf("iso clns %02x", p[0]);
|
|
if (!eflag)
|
|
(void)printf(" %s > %s",
|
|
etheraddr_string(esrc),
|
|
etheraddr_string(edst));
|
|
(void)printf(" len=%d ", length);
|
|
if (caplen > 1)
|
|
default_print_unaligned(p, caplen);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#define ESIS_REDIRECT 6
|
|
#define ESIS_ESH 2
|
|
#define ESIS_ISH 4
|
|
|
|
struct esis_hdr {
|
|
u_char version;
|
|
u_char reserved;
|
|
u_char type;
|
|
u_char tmo[2];
|
|
u_char cksum[2];
|
|
};
|
|
|
|
static void
|
|
esis_print(const u_char *p, u_int length)
|
|
{
|
|
const u_char *ep;
|
|
int li = p[1];
|
|
const struct esis_hdr *eh = (const struct esis_hdr *) &p[2];
|
|
u_char off[2];
|
|
|
|
if (length == 2) {
|
|
if (qflag)
|
|
printf(" bad pkt!");
|
|
else
|
|
printf(" no header at all!");
|
|
return;
|
|
}
|
|
ep = p + li;
|
|
if (li > length) {
|
|
if (qflag)
|
|
printf(" bad pkt!");
|
|
else
|
|
printf(" LI(%d) > PDU size (%d)!", li, length);
|
|
return;
|
|
}
|
|
if (li < sizeof(struct esis_hdr) + 2) {
|
|
if (qflag)
|
|
printf(" bad pkt!");
|
|
else {
|
|
printf(" too short for esis header %d:", li);
|
|
while (--length != 0)
|
|
printf("%02X", *p++);
|
|
}
|
|
return;
|
|
}
|
|
switch (eh->type & 0x1f) {
|
|
|
|
case ESIS_REDIRECT:
|
|
printf(" redirect");
|
|
break;
|
|
|
|
case ESIS_ESH:
|
|
printf(" esh");
|
|
break;
|
|
|
|
case ESIS_ISH:
|
|
printf(" ish");
|
|
break;
|
|
|
|
default:
|
|
printf(" type %d", eh->type & 0x1f);
|
|
break;
|
|
}
|
|
off[0] = eh->cksum[0];
|
|
off[1] = eh->cksum[1];
|
|
if (vflag && osi_cksum(p, li, off)) {
|
|
printf(" bad cksum (got %02x%02x)",
|
|
eh->cksum[1], eh->cksum[0]);
|
|
default_print(p, length);
|
|
return;
|
|
}
|
|
if (eh->version != 1) {
|
|
printf(" unsupported version %d", eh->version);
|
|
return;
|
|
}
|
|
p += sizeof(*eh) + 2;
|
|
li -= sizeof(*eh) + 2; /* protoid * li */
|
|
|
|
switch (eh->type & 0x1f) {
|
|
case ESIS_REDIRECT: {
|
|
const u_char *dst, *snpa, *is;
|
|
|
|
dst = p; p += *p + 1;
|
|
if (p > snapend)
|
|
return;
|
|
printf("\n\t\t\t %s", isonsap_string(dst));
|
|
snpa = p; p += *p + 1;
|
|
is = p; p += *p + 1;
|
|
if (p > snapend)
|
|
return;
|
|
if (p > ep) {
|
|
printf(" [bad li]");
|
|
return;
|
|
}
|
|
if (is[0] == 0)
|
|
printf(" > %s", etheraddr_string(&snpa[1]));
|
|
else
|
|
printf(" > %s", isonsap_string(is));
|
|
li = ep - p;
|
|
break;
|
|
}
|
|
#if 0
|
|
case ESIS_ESH:
|
|
printf(" esh");
|
|
break;
|
|
#endif
|
|
case ESIS_ISH: {
|
|
const u_char *is;
|
|
|
|
is = p; p += *p + 1;
|
|
if (p > ep) {
|
|
printf(" [bad li]");
|
|
return;
|
|
}
|
|
if (p > snapend)
|
|
return;
|
|
if (!qflag)
|
|
printf("\n\t\t\t %s", isonsap_string(is));
|
|
li = ep - p;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
(void)printf(" len=%d", length);
|
|
if (length && p < snapend) {
|
|
length = snapend - p;
|
|
default_print(p, length);
|
|
}
|
|
return;
|
|
}
|
|
if (vflag)
|
|
while (p < ep && li) {
|
|
int op, opli;
|
|
const u_char *q;
|
|
|
|
if (snapend - p < 2)
|
|
return;
|
|
if (li < 2) {
|
|
printf(" bad opts/li");
|
|
return;
|
|
}
|
|
op = *p++;
|
|
opli = *p++;
|
|
li -= 2;
|
|
if (opli > li) {
|
|
printf(" opt (%d) too long", op);
|
|
return;
|
|
}
|
|
li -= opli;
|
|
q = p;
|
|
p += opli;
|
|
if (snapend < p)
|
|
return;
|
|
if (op == 198 && opli == 2) {
|
|
printf(" tmo=%d", q[0] * 256 + q[1]);
|
|
continue;
|
|
}
|
|
printf (" %d:<", op);
|
|
while (--opli >= 0)
|
|
printf("%02x", *q++);
|
|
printf (">");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* print_nsap
|
|
* Print out an NSAP.
|
|
*/
|
|
|
|
static void
|
|
print_nsap (register const u_char *cp, register int length)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < length; i++) {
|
|
printf("%02x", *cp++);
|
|
if (((i & 1) == 0) && (i + 1 < length)) {
|
|
printf(".");
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
/*
|
|
* isis_print
|
|
* Decode IS-IS packets. Return 0 on error.
|
|
*
|
|
* So far, this is only smart enough to print IIH's. Someday...
|
|
*/
|
|
|
|
static int
|
|
isis_print (const u_char *p, u_int length)
|
|
{
|
|
struct isis_header *header;
|
|
struct isis_ptp_header *header_ptp;
|
|
u_char pdu_type, max_area, priority, type, len, tmp, alen;
|
|
const u_char *pptr, *tptr;
|
|
u_short packet_len, holding_time;
|
|
int i;
|
|
|
|
header = (struct isis_header *)p;
|
|
header_ptp = (struct isis_ptp_header *)header;
|
|
printf("\n\t\t\t");
|
|
|
|
/*
|
|
* Sanity checking of the header.
|
|
*/
|
|
if (header->nlpid != NLPID_ISIS) {
|
|
printf(" coding error!");
|
|
return(0);
|
|
}
|
|
|
|
if (header->version != ISIS_VERSION) {
|
|
printf(" version %d packet not supported", header->version);
|
|
return(0);
|
|
}
|
|
|
|
if ((header->id_length != SYSTEM_ID_LEN) && (header->id_length != 0)) {
|
|
printf(" system ID length of %d is not supported",
|
|
header->id_length);
|
|
return(0);
|
|
}
|
|
|
|
if ((header->fixed_len != ISIS_HEADER_SIZE) &&
|
|
(header->fixed_len != ISIS_PTP_HEADER_SIZE) &&
|
|
(header->fixed_len != L1_LS_PDU_HEADER_SIZE) &&
|
|
(header-> fixed_len != L1_COMPLETE_SEQ_PDU_HEADER_SIZE) ) {
|
|
printf(" bogus fixed header length %u",
|
|
header->fixed_len);
|
|
return(0);
|
|
}
|
|
|
|
pdu_type = header->enc_pdu_type & PDU_TYPE_MASK;
|
|
if ((pdu_type != L1_LAN_IIH) && (pdu_type != L2_LAN_IIH) &&
|
|
(pdu_type != PTP_IIH) &&
|
|
(pdu_type != L1_COMPLETE_SEQ_PDU) &&
|
|
(pdu_type != L2_COMPLETE_SEQ_PDU) ) {
|
|
printf(" PDU type (%d) not supported", pdu_type);
|
|
return(0);
|
|
}
|
|
|
|
if (header->pkt_version != ISIS_VERSION) {
|
|
printf(" version %d packet not supported", header->pkt_version);
|
|
return(0);
|
|
}
|
|
|
|
max_area = header->enc_max_area;
|
|
switch(max_area) {
|
|
case 0:
|
|
max_area = 3; /* silly shit */
|
|
break;
|
|
case 255:
|
|
printf(" bad packet -- 255 areas");
|
|
return(0);
|
|
default:
|
|
break;
|
|
}
|
|
|
|
switch (header->circuit) {
|
|
case 0:
|
|
printf(" PDU with circuit type 0");
|
|
return(0);
|
|
case 1:
|
|
if (pdu_type == L2_LAN_IIH) {
|
|
printf(" L2 IIH on an L1 only circuit");
|
|
return(0);
|
|
}
|
|
break;
|
|
case 2:
|
|
if (pdu_type == L1_LAN_IIH) {
|
|
printf(" L1 IIH on an L2 only circuit");
|
|
return(0);
|
|
}
|
|
break;
|
|
case 3:
|
|
break;
|
|
default:
|
|
printf(" unknown circuit type");
|
|
return(0);
|
|
}
|
|
|
|
holding_time = EXTRACT_16BITS(header->enc_holding_time);
|
|
|
|
packet_len = EXTRACT_16BITS(header->enc_packet_len);
|
|
if ((packet_len < ISIS_HEADER_SIZE) ||
|
|
(packet_len > length)) {
|
|
printf(" bogus packet length %d, real length %d", packet_len,
|
|
length);
|
|
return(0);
|
|
}
|
|
|
|
if(pdu_type != PTP_IIH)
|
|
priority = header->enc_priority & PRIORITY_MASK;
|
|
|
|
/*
|
|
* Now print the fixed header.
|
|
*/
|
|
switch (pdu_type) {
|
|
case L1_LAN_IIH:
|
|
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 = p + ISIS_PTP_HEADER_SIZE;
|
|
} else {
|
|
packet_len -= ISIS_HEADER_SIZE;
|
|
pptr = 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 >= ETHER_ADDR_LEN) {
|
|
printf("\n\t\t\t %s", etheraddr_string(tptr));
|
|
tmp -= ETHER_ADDR_LEN;
|
|
tptr += ETHER_ADDR_LEN;
|
|
}
|
|
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);
|
|
}
|