print-isoclns.c revision 32149 
1/*
2 * Copyright (c) 1992, 1993, 1994, 1995, 1996
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * Original code by Matt Thomas, Digital Equipment Corporation
22 */
23
24#ifndef lint
25static const char rcsid[] =
26    "@(#) $Header: print-isoclns.c,v 1.14 96/12/10 23:26:56 leres Exp $ (LBL)";
27#endif
28
29#include <sys/types.h>
30#include <sys/time.h>
31#include <sys/socket.h>
32
33#if __STDC__
34struct mbuf;
35struct rtentry;
36#endif
37#include <net/if.h>
38
39#include <netinet/in.h>
40#include <net/ethernet.h>
41
42#include <stdio.h>
43
44#include "interface.h"
45#include "addrtoname.h"
46#include "ethertype.h"
47#include "extract.h"
48
49#define	NLPID_CLNS	129	/* 0x81 */
50#define	NLPID_ESIS	130	/* 0x82 */
51#define	NLPID_ISIS	131	/* 0x83 */
52#define	NLPID_NULLNS	0
53
54
55/*
56 * IS-IS is defined in ISO 10589.  Look there for protocol definitions.
57 */
58
59#define SYSTEM_ID_LEN	sizeof(struct ether_addr)
60#define ISIS_VERSION	1
61#define PDU_TYPE_MASK	0x1F
62#define PRIORITY_MASK	0x7F
63
64#define L1_LAN_IIH	15
65#define L2_LAN_IIH	16
66#define PTP_IIH		17
67#define L1_LS_PDU       18
68#define L2_LS_PDU       19
69#define L1_COMPLETE_SEQ_PDU  24
70#define L2_COMPLETE_SEQ_PDU  25
71
72/*
73 * A TLV is a tuple of a type, length and a value and is normally used for
74 * encoding information in all sorts of places.  This is an enumeration of
75 * the well known types.
76 */
77
78#define TLV_AREA_ADDR   1
79#define TLV_IS_REACH	2
80#define TLV_ES_REACH	3
81#define TLV_SUMMARY	5
82#define TLV_ISNEIGH     6
83#define TLV_PADDING     8
84#define TLV_LSP		9
85#define TLV_AUTHENT     10
86#define TLV_IP_REACH	128
87#define TLV_PROTOCOLS	129
88#define TLV_IP_EXTERN	130
89#define TLV_IDRP_INFO	131
90#define TLV_IPADDR	132
91#define TLV_IPAUTH	133
92#define TLV_PTP_ADJ	240
93
94/*
95 * Katz's point to point adjacency TLV uses codes to tell us the state of
96 * the remote adjacency.  Enumerate them.
97 */
98
99#define ISIS_PTP_ADJ_UP   0
100#define ISIS_PTP_ADJ_INIT 1
101#define ISIS_PTP_ADJ_DOWN 2
102
103static int osi_cksum(const u_char *, int, u_char *);
104static void esis_print(const u_char *, u_int);
105static int isis_print(const u_char *, u_int);
106
107
108struct isis_ptp_adjancey_values {
109	u_char id;
110	char   *name;
111};
112
113static struct isis_ptp_adjancey_values isis_ptp_adjancey_values[] = {
114	ISIS_PTP_ADJ_UP,    "UP",
115	ISIS_PTP_ADJ_INIT,  "INIT",
116        ISIS_PTP_ADJ_DOWN,  "DOWN"
117};
118
119struct isis_common_header {
120    u_char nlpid;
121    u_char fixed_len;
122    u_char version;			/* Protocol version? */
123    u_char id_length;
124    u_char enc_pdu_type;		/* 3 MSbs are reserved */
125    u_char pkt_version;			/* Packet format version? */
126    u_char reserved;
127    u_char enc_max_area;
128};
129
130struct isis_header {
131    u_char nlpid;
132    u_char fixed_len;
133    u_char version;			/* Protocol version? */
134    u_char id_length;
135    u_char enc_pdu_type;		/* 3 MSbs are reserved */
136    u_char pkt_version;			/* Packet format version? */
137    u_char reserved;
138    u_char enc_max_area;
139    u_char circuit;
140    u_char enc_source_id[SYSTEM_ID_LEN];
141    u_char enc_holding_time[2];
142    u_char enc_packet_len[2];
143    u_char enc_priority;
144    u_char enc_lan_id[SYSTEM_ID_LEN+1];
145};
146struct isis_lan_header {
147    u_char circuit;
148    u_char enc_source_id[SYSTEM_ID_LEN];
149    u_char enc_holding_time[2];
150    u_char enc_packet_len[2];
151    u_char enc_priority;
152    u_char enc_lan_id[SYSTEM_ID_LEN+1];
153};
154
155struct isis_ptp_header {
156    u_char circuit;
157    u_char enc_source_id[SYSTEM_ID_LEN];
158    u_char enc_holding_time[2];
159    u_char enc_packet_len[2];
160    u_char loc_circuit_id;
161};
162
163#define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header))
164#define ISIS_HEADER_SIZE (15+(SYSTEM_ID_LEN<<1))
165#define ISIS_PTP_HEADER_SIZE (14+SYSTEM_ID_LEN)
166#define L1_LS_PDU_HEADER_SIZE (21+SYSTEM_ID_LEN)
167#define L2_LS_PDU_HEADER_SIZE L1_LS_PDU_HEADER_SIZE
168#define L1_COMPLETE_SEQ_PDU_HEADER_SIZE 33
169#define L2_COMPLETE_SEQ_PDU_HEADER_SIZE L1_COMPLETE_SEQ_PDU_HEADER_SIZE
170
171
172
173void
174isoclns_print(const u_char *p, u_int length, u_int caplen,
175	      const u_char *esrc, const u_char *edst)
176{
177	u_char pdu_type;
178	struct isis_header *header;
179
180	header = (struct isis_header *)p;
181	pdu_type = header->enc_pdu_type & PDU_TYPE_MASK;
182
183	if (caplen < 1) {
184		printf("[|iso-clns] ");
185		if (!eflag)
186			printf("%s > %s",
187			       etheraddr_string(esrc),
188			       etheraddr_string(edst));
189		return;
190	}
191
192	switch (*p) {
193
194	case NLPID_CLNS:
195		printf("iso clns");
196		if (!eflag)
197			(void)printf(" %s > %s",
198				     etheraddr_string(esrc),
199				     etheraddr_string(edst));
200		break;
201
202	case NLPID_ESIS:
203		printf("iso esis");
204		if (!eflag)
205			(void)printf(" %s > %s",
206				     etheraddr_string(esrc),
207				     etheraddr_string(edst));
208		esis_print(p, length);
209		return;
210
211	case NLPID_ISIS:
212		printf("iso isis");
213		if (!eflag) {
214			if(pdu_type != PTP_IIH)
215				(void)printf(" %s > %s",
216				     etheraddr_string(esrc),
217				     etheraddr_string(edst));
218		}
219		(void)printf(" len=%d ", length);
220		if (!isis_print(p, length))
221		    default_print_unaligned(p, caplen);
222		break;
223
224	case NLPID_NULLNS:
225		printf("iso nullns");
226		if (!eflag)
227			(void)printf(" %s > %s",
228				     etheraddr_string(esrc),
229				     etheraddr_string(edst));
230		break;
231
232	default:
233		printf("iso clns %02x", p[0]);
234		if (!eflag)
235			(void)printf(" %s > %s",
236				     etheraddr_string(esrc),
237				     etheraddr_string(edst));
238		(void)printf(" len=%d ", length);
239		if (caplen > 1)
240			default_print_unaligned(p, caplen);
241		break;
242	}
243}
244
245#define	ESIS_REDIRECT	6
246#define	ESIS_ESH	2
247#define	ESIS_ISH	4
248
249struct esis_hdr {
250	u_char version;
251	u_char reserved;
252	u_char type;
253	u_char tmo[2];
254	u_char cksum[2];
255};
256
257static void
258esis_print(const u_char *p, u_int length)
259{
260	const u_char *ep;
261	int li = p[1];
262	const struct esis_hdr *eh = (const struct esis_hdr *) &p[2];
263	u_char cksum[2];
264	u_char off[2];
265
266	if (length == 2) {
267		if (qflag)
268			printf(" bad pkt!");
269		else
270			printf(" no header at all!");
271		return;
272	}
273	ep = p + li;
274	if (li > length) {
275		if (qflag)
276			printf(" bad pkt!");
277		else
278			printf(" LI(%d) > PDU size (%d)!", li, length);
279		return;
280	}
281	if (li < sizeof(struct esis_hdr) + 2) {
282		if (qflag)
283			printf(" bad pkt!");
284		else {
285			printf(" too short for esis header %d:", li);
286			while (--length >= 0)
287				printf("%02X", *p++);
288		}
289		return;
290	}
291	switch (eh->type & 0x1f) {
292
293	case ESIS_REDIRECT:
294		printf(" redirect");
295		break;
296
297	case ESIS_ESH:
298		printf(" esh");
299		break;
300
301	case ESIS_ISH:
302		printf(" ish");
303		break;
304
305	default:
306		printf(" type %d", eh->type & 0x1f);
307		break;
308	}
309	off[0] = eh->cksum[0];
310	off[1] = eh->cksum[1];
311	if (vflag && osi_cksum(p, li, off)) {
312		printf(" bad cksum (got %02x%02x)",
313		       eh->cksum[1], eh->cksum[0]);
314		default_print(p, length);
315		return;
316	}
317	if (eh->version != 1) {
318		printf(" unsupported version %d", eh->version);
319		return;
320	}
321	p += sizeof(*eh) + 2;
322	li -= sizeof(*eh) + 2;	/* protoid * li */
323
324	switch (eh->type & 0x1f) {
325	case ESIS_REDIRECT: {
326		const u_char *dst, *snpa, *is;
327
328		dst = p; p += *p + 1;
329		if (p > snapend)
330			return;
331		printf("\n\t\t\t %s", isonsap_string(dst));
332		snpa = p; p += *p + 1;
333		is = p;   p += *p + 1;
334		if (p > snapend)
335			return;
336		if (p > ep) {
337			printf(" [bad li]");
338			return;
339		}
340		if (is[0] == 0)
341			printf(" > %s", etheraddr_string(&snpa[1]));
342		else
343			printf(" > %s", isonsap_string(is));
344		li = ep - p;
345		break;
346	}
347#if 0
348	case ESIS_ESH:
349		printf(" esh");
350		break;
351#endif
352	case ESIS_ISH: {
353		const u_char *is;
354
355		is = p; p += *p + 1;
356		if (p > ep) {
357			printf(" [bad li]");
358			return;
359		}
360		if (p > snapend)
361			return;
362		if (!qflag)
363			printf("\n\t\t\t %s", isonsap_string(is));
364		li = ep - p;
365		break;
366	}
367
368	default:
369		(void)printf(" len=%d", length);
370		if (length && p < snapend) {
371			length = snapend - p;
372			default_print(p, length);
373		}
374		return;
375	}
376	if (vflag)
377		while (p < ep && li) {
378			int op, opli;
379			const u_char *q;
380
381			if (snapend - p < 2)
382				return;
383			if (li < 2) {
384				printf(" bad opts/li");
385				return;
386			}
387			op = *p++;
388			opli = *p++;
389			li -= 2;
390			if (opli > li) {
391				printf(" opt (%d) too long", op);
392				return;
393			}
394			li -= opli;
395			q = p;
396			p += opli;
397			if (snapend < p)
398				return;
399			if (op == 198 && opli == 2) {
400				printf(" tmo=%d", q[0] * 256 + q[1]);
401				continue;
402			}
403			printf (" %d:<", op);
404			while (--opli >= 0)
405				printf("%02x", *q++);
406			printf (">");
407		}
408}
409
410/*
411 * print_nsap
412 * Print out an NSAP.
413 */
414
415void
416print_nsap (register const u_char *cp, register int length)
417{
418    int i;
419
420    for (i = 0; i < length; i++) {
421	printf("%02x", *cp++);
422	if (((i & 1) == 0) && (i + 1 < length)) {
423	    printf(".");
424	}
425
426    }
427}
428
429/*
430 * isis_print
431 * Decode IS-IS packets.  Return 0 on error.
432 *
433 * So far, this is only smart enough to print IIH's.  Someday...
434 */
435
436static int
437isis_print (const u_char *p, u_int length)
438{
439    struct isis_header *header;
440    struct isis_ptp_header *header_ptp;
441    u_char pdu_type, max_area, priority, *pptr, type, len, *tptr, tmp, alen;
442    u_short packet_len, holding_time;
443    int i;
444
445    header_ptp = (struct isis_ptp_header *)header = (struct isis_header *)p;
446    printf("\n\t\t\t");
447
448    /*
449     * Sanity checking of the header.
450     */
451    if (header->nlpid != NLPID_ISIS) {
452	printf(" coding error!");
453	return(0);
454    }
455
456    if (header->version != ISIS_VERSION) {
457	printf(" version %d packet not supported", header->version);
458	return(0);
459    }
460
461    if ((header->id_length != SYSTEM_ID_LEN) && (header->id_length != 0)) {
462	printf(" system ID length of %d is not supported",
463	       header->id_length);
464	return(0);
465    }
466
467    if ((header->fixed_len != ISIS_HEADER_SIZE) &&
468	(header->fixed_len != ISIS_PTP_HEADER_SIZE) &&
469	(header->fixed_len != L1_LS_PDU_HEADER_SIZE) &&
470	(header-> fixed_len != L1_COMPLETE_SEQ_PDU_HEADER_SIZE) ) {
471	    printf(" bogus fixed header length",
472		   header->fixed_len);
473	    return(0);
474    }
475
476    pdu_type = header->enc_pdu_type & PDU_TYPE_MASK;
477    if ((pdu_type != L1_LAN_IIH) && (pdu_type != L2_LAN_IIH) &&
478	(pdu_type != PTP_IIH) &&
479	(pdu_type != L1_COMPLETE_SEQ_PDU) &&
480	(pdu_type != L2_COMPLETE_SEQ_PDU) ) {
481	printf(" PDU type (%d) not supported", pdu_type);
482	return;
483    }
484
485    if (header->pkt_version != ISIS_VERSION) {
486	printf(" version %d packet not supported", header->pkt_version);
487	return;
488    }
489
490    max_area = header->enc_max_area;
491    switch(max_area) {
492    case 0:
493	max_area = 3;			/* silly shit */
494	break;
495    case 255:
496	printf(" bad packet -- 255 areas");
497	return(0);
498    default:
499	break;
500    }
501
502    switch (header->circuit) {
503    case 0:
504	printf(" PDU with circuit type 0");
505	return(0);
506    case 1:
507	if (pdu_type == L2_LAN_IIH) {
508	    printf(" L2 IIH on an L1 only circuit");
509	    return(0);
510	}
511	break;
512    case 2:
513	if (pdu_type == L1_LAN_IIH) {
514	    printf(" L1 IIH on an L2 only circuit");
515	    return(0);
516	}
517	break;
518    case 3:
519	break;
520    default:
521	printf(" unknown circuit type");
522	return(0);
523    }
524
525    holding_time = EXTRACT_16BITS(header->enc_holding_time);
526
527    packet_len = EXTRACT_16BITS(header->enc_packet_len);
528    if ((packet_len < ISIS_HEADER_SIZE) ||
529	(packet_len > length)) {
530	printf(" bogus packet length %d, real length %d", packet_len,
531	       length);
532	return(0);
533    }
534
535    if(pdu_type != PTP_IIH)
536	    priority = header->enc_priority & PRIORITY_MASK;
537
538    /*
539     * Now print the fixed header.
540     */
541    switch (pdu_type) {
542    case L1_LAN_IIH:
543	printf(" L1 lan iih, ");
544	break;
545    case L2_LAN_IIH:
546	printf(" L2 lan iih, ");
547	break;
548    case PTP_IIH:
549	printf(" PTP iih, ");
550	break;
551    }
552
553    printf("circuit ");
554    switch (header->circuit) {
555    case 1:
556	printf("l1 only, ");
557	break;
558    case 2:
559	printf("l2 only, ");
560	break;
561    case 3:
562	printf("l1-l2, ");
563	break;
564    }
565
566    printf ("holding time %d ", holding_time);
567    printf ("\n\t\t\t source %s, length %d",
568	    etheraddr_string(header->enc_source_id), packet_len);
569    if((pdu_type==L1_LAN_IIH)||(pdu_type==L2_LAN_IIH))
570	    printf ("\n\t\t\t lan id %s(%d)", etheraddr_string(header->enc_lan_id),
571		    header->enc_lan_id[SYSTEM_ID_LEN]);
572
573    /*
574     * Now print the TLV's.
575     */
576    if(pdu_type==PTP_IIH) {
577	    packet_len -= ISIS_PTP_HEADER_SIZE;
578	    pptr = (char *)p + ISIS_PTP_HEADER_SIZE;
579    } else {
580	    packet_len -= ISIS_HEADER_SIZE;
581	    pptr = (char *)p + ISIS_HEADER_SIZE;
582    }
583    while (packet_len >= 2) {
584	if (pptr >= snapend) {
585	    printf("\n\t\t\t packet exceeded snapshot");
586	    return(1);
587	}
588	type = *pptr++;
589	len = *pptr++;
590	packet_len -= 2;
591	if (len > packet_len) {
592	    break;
593	}
594
595	switch (type) {
596	case TLV_AREA_ADDR:
597	    printf("\n\t\t\t area addresses");
598	    tmp = len;
599	    tptr = pptr;
600	    alen = *tptr++;
601	    while (tmp && alen < tmp) {
602		printf("\n\t\t\t ");
603		print_nsap(tptr, alen);
604		printf(" (%d)", alen);
605		tptr += alen;
606		tmp -= alen + 1;
607		alen = *tptr++;
608	    }
609	    break;
610	case TLV_ISNEIGH:
611	    printf("\n\t\t\t neighbor addresses");
612	    tmp = len;
613	    tptr = pptr;
614	    while (tmp >= sizeof(struct ether_addr)) {
615		printf("\n\t\t\t %s", etheraddr_string(tptr));
616		tmp -= sizeof(struct ether_addr);
617		tptr += sizeof(struct ether_addr);
618	    }
619	    break;
620	case TLV_PADDING:
621	    printf("\n\t\t\t padding for %d bytes", len);
622	    break;
623	case TLV_AUTHENT:
624	    printf("\n\t\t\t authentication data");
625	    default_print(pptr, len);
626	    break;
627	case TLV_PTP_ADJ:
628	    printf("\n\t\t\t PTP adjacency status %s",
629		   isis_ptp_adjancey_values[*pptr].name);
630	    break;
631	case TLV_PROTOCOLS:
632	    printf("\n\t\t\t Supports protocols %s", (len>1)? "are":"is");
633	    for(i=0;i<len;i++)
634		printf(" %02X", (u_char)*(pptr+i));
635	    break;
636	case TLV_IPADDR:
637	    printf("\n\t\t\t IP address: %s", ipaddr_string(pptr));
638	    break;
639	default:
640	    printf("\n\t\t\t unknown TLV, type %d, length %d", type, len);
641	    break;
642	}
643
644	pptr += len;
645	packet_len -= len;
646    }
647
648    if (packet_len != 0) {
649	printf("\n\t\t\t %d straggler bytes", packet_len);
650    }
651    return(1);
652}
653
654/*
655 * Verify the checksum.  See 8473-1, Appendix C, section C.4.
656 */
657
658static int
659osi_cksum(register const u_char *p, register int len, u_char *off)
660{
661	int32_t c0 = 0, c1 = 0;
662
663	if ((off[0] == 0) && (off[1] == 0))
664		return 0;
665
666	while (--len >= 0) {
667		c0 += *p++;
668		c0 %= 255;
669		c1 += c0;
670		c1 %= 255;
671	}
672	return (c0 | c1);
673}
674