print-ether.c revision 236192 
1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
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 * $FreeBSD: stable/9/contrib/tcpdump/print-ether.c 236192 2012-05-28 19:13:21Z delphij $
22 */
23#ifndef lint
24static const char rcsid[] _U_ =
25    "@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.106 2008-02-06 10:47:53 guy Exp $ (LBL)";
26#endif
27
28#define NETDISSECT_REWORKED
29#ifdef HAVE_CONFIG_H
30#include "config.h"
31#endif
32
33#include <tcpdump-stdinc.h>
34
35#include <stdio.h>
36#include <pcap.h>
37
38#include "interface.h"
39#include "extract.h"
40#include "addrtoname.h"
41#include "ethertype.h"
42
43#include "ether.h"
44
45const struct tok ethertype_values[] = {
46    { ETHERTYPE_IP,		"IPv4" },
47    { ETHERTYPE_MPLS,		"MPLS unicast" },
48    { ETHERTYPE_MPLS_MULTI,	"MPLS multicast" },
49    { ETHERTYPE_IPV6,		"IPv6" },
50    { ETHERTYPE_8021Q,		"802.1Q" },
51    { ETHERTYPE_8021Q9100,	"802.1Q-9100" },
52    { ETHERTYPE_8021QinQ,	"802.1Q-QinQ" },
53    { ETHERTYPE_8021Q9200,	"802.1Q-9200" },
54    { ETHERTYPE_VMAN,		"VMAN" },
55    { ETHERTYPE_PUP,            "PUP" },
56    { ETHERTYPE_ARP,            "ARP"},
57    { ETHERTYPE_REVARP,         "Reverse ARP"},
58    { ETHERTYPE_NS,             "NS" },
59    { ETHERTYPE_SPRITE,         "Sprite" },
60    { ETHERTYPE_TRAIL,          "Trail" },
61    { ETHERTYPE_MOPDL,          "MOP DL" },
62    { ETHERTYPE_MOPRC,          "MOP RC" },
63    { ETHERTYPE_DN,             "DN" },
64    { ETHERTYPE_LAT,            "LAT" },
65    { ETHERTYPE_SCA,            "SCA" },
66    { ETHERTYPE_TEB,            "TEB" },
67    { ETHERTYPE_LANBRIDGE,      "Lanbridge" },
68    { ETHERTYPE_DECDNS,         "DEC DNS" },
69    { ETHERTYPE_DECDTS,         "DEC DTS" },
70    { ETHERTYPE_VEXP,           "VEXP" },
71    { ETHERTYPE_VPROD,          "VPROD" },
72    { ETHERTYPE_ATALK,          "Appletalk" },
73    { ETHERTYPE_AARP,           "Appletalk ARP" },
74    { ETHERTYPE_IPX,            "IPX" },
75    { ETHERTYPE_PPP,            "PPP" },
76    { ETHERTYPE_MPCP,           "MPCP" },
77    { ETHERTYPE_SLOW,           "Slow Protocols" },
78    { ETHERTYPE_PPPOED,         "PPPoE D" },
79    { ETHERTYPE_PPPOES,         "PPPoE S" },
80    { ETHERTYPE_EAPOL,          "EAPOL" },
81    { ETHERTYPE_RRCP,           "RRCP" },
82    { ETHERTYPE_JUMBO,          "Jumbo" },
83    { ETHERTYPE_LOOPBACK,       "Loopback" },
84    { ETHERTYPE_ISO,            "OSI" },
85    { ETHERTYPE_GRE_ISO,        "GRE-OSI" },
86    { ETHERTYPE_CFM_OLD,        "CFM (old)" },
87    { ETHERTYPE_CFM,            "CFM" },
88    { ETHERTYPE_LLDP,           "LLDP" },
89    { 0, NULL}
90};
91
92static inline void
93ether_hdr_print(netdissect_options *ndo,
94                const u_char *bp, u_int length)
95{
96	register const struct ether_header *ep;
97	u_int16_t ether_type;
98
99	ep = (const struct ether_header *)bp;
100
101	(void)ND_PRINT((ndo, "%s > %s",
102		     etheraddr_string(ESRC(ep)),
103		     etheraddr_string(EDST(ep))));
104
105	ether_type = EXTRACT_16BITS(&ep->ether_type);
106	if (!ndo->ndo_qflag) {
107	        if (ether_type <= ETHERMTU)
108		          (void)ND_PRINT((ndo, ", 802.3"));
109                else
110		          (void)ND_PRINT((ndo, ", ethertype %s (0x%04x)",
111				       tok2str(ethertype_values,"Unknown", ether_type),
112                                       ether_type));
113        } else {
114                if (ether_type <= ETHERMTU)
115                          (void)ND_PRINT((ndo, ", 802.3"));
116                else
117                          (void)ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type)));
118        }
119
120	(void)ND_PRINT((ndo, ", length %u: ", length));
121}
122
123/*
124 * Print an Ethernet frame.
125 * This might be encapsulated within another frame; we might be passed
126 * a pointer to a function that can print header information for that
127 * frame's protocol, and an argument to pass to that function.
128 */
129void
130ether_print(netdissect_options *ndo,
131            const u_char *p, u_int length, u_int caplen,
132            void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
133{
134	struct ether_header *ep;
135	u_int orig_length;
136	u_short ether_type;
137	u_short extracted_ether_type;
138
139	if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) {
140		ND_PRINT((ndo, "[|ether]"));
141		return;
142	}
143
144	if (ndo->ndo_eflag) {
145		if (print_encap_header != NULL)
146			(*print_encap_header)(ndo, encap_header_arg);
147		ether_hdr_print(ndo, p, length);
148	}
149	orig_length = length;
150
151	length -= ETHER_HDRLEN;
152	caplen -= ETHER_HDRLEN;
153	ep = (struct ether_header *)p;
154	p += ETHER_HDRLEN;
155
156	ether_type = EXTRACT_16BITS(&ep->ether_type);
157
158recurse:
159	/*
160	 * Is it (gag) an 802.3 encapsulation?
161	 */
162	if (ether_type <= ETHERMTU) {
163		/* Try to print the LLC-layer header & higher layers */
164		if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
165		    &extracted_ether_type) == 0) {
166			/* ether_type not known, print raw packet */
167			if (!ndo->ndo_eflag) {
168				if (print_encap_header != NULL)
169					(*print_encap_header)(ndo, encap_header_arg);
170				ether_hdr_print(ndo, (u_char *)ep, orig_length);
171			}
172
173			if (!ndo->ndo_suppress_default_print)
174				ndo->ndo_default_print(ndo, p, caplen);
175		}
176	} else if (ether_type == ETHERTYPE_8021Q  ||
177                ether_type == ETHERTYPE_8021Q9100 ||
178                ether_type == ETHERTYPE_8021Q9200 ||
179                ether_type == ETHERTYPE_8021QinQ) {
180		/*
181		 * Print VLAN information, and then go back and process
182		 * the enclosed type field.
183		 */
184		if (caplen < 4 || length < 4) {
185			ND_PRINT((ndo, "[|vlan]"));
186			return;
187		}
188	        if (ndo->ndo_eflag) {
189	        	u_int16_t tag = EXTRACT_16BITS(p);
190
191			ND_PRINT((ndo, "vlan %u, p %u%s, ",
192			    tag & 0xfff,
193			    tag >> 13,
194			    (tag & 0x1000) ? ", CFI" : ""));
195		}
196
197		ether_type = EXTRACT_16BITS(p + 2);
198		if (ndo->ndo_eflag && ether_type > ETHERMTU)
199			ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)));
200		p += 4;
201		length -= 4;
202		caplen -= 4;
203		goto recurse;
204	} else if (ether_type == ETHERTYPE_JUMBO) {
205		/*
206		 * Alteon jumbo frames.
207		 * See
208		 *
209		 *	http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
210		 *
211		 * which indicates that, following the type field,
212		 * there's an LLC header and payload.
213		 */
214		/* Try to print the LLC-layer header & higher layers */
215		if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
216		    &extracted_ether_type) == 0) {
217			/* ether_type not known, print raw packet */
218			if (!ndo->ndo_eflag) {
219				if (print_encap_header != NULL)
220					(*print_encap_header)(ndo, encap_header_arg);
221				ether_hdr_print(ndo, (u_char *)ep, orig_length);
222			}
223
224			if (!ndo->ndo_suppress_default_print)
225				ndo->ndo_default_print(ndo, p, caplen);
226		}
227	} else {
228		if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
229			/* ether_type not known, print raw packet */
230			if (!ndo->ndo_eflag) {
231				if (print_encap_header != NULL)
232					(*print_encap_header)(ndo, encap_header_arg);
233				ether_hdr_print(ndo, (u_char *)ep, orig_length);
234			}
235
236			if (!ndo->ndo_suppress_default_print)
237				ndo->ndo_default_print(ndo, p, caplen);
238		}
239	}
240}
241
242/*
243 * This is the top level routine of the printer.  'p' points
244 * to the ether header of the packet, 'h->ts' is the timestamp,
245 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
246 * is the number of bytes actually captured.
247 */
248u_int
249ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
250               const u_char *p)
251{
252	ether_print(ndo, p, h->len, h->caplen, NULL, NULL);
253
254	return (ETHER_HDRLEN);
255}
256
257/*
258 * This is the top level routine of the printer.  'p' points
259 * to the ether header of the packet, 'h->ts' is the timestamp,
260 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
261 * is the number of bytes actually captured.
262 *
263 * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
264 * before the Ethernet header.
265 */
266u_int
267netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
268                     const u_char *p)
269{
270	/*
271	 * Fail if we don't have enough data for the Hilscher pseudo-header.
272	 */
273	if (h->len < 4 || h->caplen < 4) {
274		printf("[|netanalyzer]");
275		return (h->caplen);
276	}
277
278	/* Skip the pseudo-header. */
279	ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL);
280
281	return (4 + ETHER_HDRLEN);
282}
283
284/*
285 * This is the top level routine of the printer.  'p' points
286 * to the ether header of the packet, 'h->ts' is the timestamp,
287 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
288 * is the number of bytes actually captured.
289 *
290 * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
291 * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
292 * before the Ethernet header.
293 */
294u_int
295netanalyzer_transparent_if_print(netdissect_options *ndo,
296                                 const struct pcap_pkthdr *h,
297                                 const u_char *p)
298{
299	/*
300	 * Fail if we don't have enough data for the Hilscher pseudo-header,
301	 * preamble, and SOF.
302	 */
303	if (h->len < 12 || h->caplen < 12) {
304		printf("[|netanalyzer-transparent]");
305		return (h->caplen);
306	}
307
308	/* Skip the pseudo-header, preamble, and SOF. */
309	ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL);
310
311	return (12 + ETHER_HDRLEN);
312}
313
314/*
315 * Prints the packet payload, given an Ethernet type code for the payload's
316 * protocol.
317 *
318 * Returns non-zero if it can do so, zero if the ethertype is unknown.
319 */
320
321int
322ethertype_print(netdissect_options *ndo,
323                u_short ether_type, const u_char *p,
324                u_int length, u_int caplen)
325{
326	switch (ether_type) {
327
328	case ETHERTYPE_IP:
329	        ip_print(ndo, p, length);
330		return (1);
331
332#ifdef INET6
333	case ETHERTYPE_IPV6:
334		ip6_print(ndo, p, length);
335		return (1);
336#endif /*INET6*/
337
338	case ETHERTYPE_ARP:
339	case ETHERTYPE_REVARP:
340  	        arp_print(ndo, p, length, caplen);
341		return (1);
342
343	case ETHERTYPE_DN:
344		decnet_print(/*ndo,*/p, length, caplen);
345		return (1);
346
347	case ETHERTYPE_ATALK:
348		if (ndo->ndo_vflag)
349			fputs("et1 ", stdout);
350		atalk_print(/*ndo,*/p, length);
351		return (1);
352
353	case ETHERTYPE_AARP:
354		aarp_print(/*ndo,*/p, length);
355		return (1);
356
357	case ETHERTYPE_IPX:
358		ND_PRINT((ndo, "(NOV-ETHII) "));
359		ipx_print(/*ndo,*/p, length);
360		return (1);
361
362        case ETHERTYPE_ISO:
363                isoclns_print(/*ndo,*/p+1, length-1, length-1);
364                return(1);
365
366	case ETHERTYPE_PPPOED:
367	case ETHERTYPE_PPPOES:
368	case ETHERTYPE_PPPOED2:
369	case ETHERTYPE_PPPOES2:
370		pppoe_print(/*ndo,*/p, length);
371		return (1);
372
373	case ETHERTYPE_EAPOL:
374	        eap_print(ndo, p, length);
375		return (1);
376
377	case ETHERTYPE_RRCP:
378	        rrcp_print(ndo, p - 14 , length + 14);
379		return (1);
380
381	case ETHERTYPE_PPP:
382		if (length) {
383			printf(": ");
384			ppp_print(/*ndo,*/p, length);
385		}
386		return (1);
387
388	case ETHERTYPE_MPCP:
389	        mpcp_print(/*ndo,*/p, length);
390		return (1);
391
392	case ETHERTYPE_SLOW:
393	        slow_print(/*ndo,*/p, length);
394		return (1);
395
396	case ETHERTYPE_CFM:
397	case ETHERTYPE_CFM_OLD:
398	        cfm_print(/*ndo,*/p, length);
399		return (1);
400
401	case ETHERTYPE_LLDP:
402	        lldp_print(/*ndo,*/p, length);
403		return (1);
404
405        case ETHERTYPE_LOOPBACK:
406                return (1);
407
408	case ETHERTYPE_MPLS:
409	case ETHERTYPE_MPLS_MULTI:
410		mpls_print(/*ndo,*/p, length);
411		return (1);
412
413	case ETHERTYPE_LAT:
414	case ETHERTYPE_SCA:
415	case ETHERTYPE_MOPRC:
416	case ETHERTYPE_MOPDL:
417		/* default_print for now */
418	default:
419		return (0);
420	}
421}
422
423
424/*
425 * Local Variables:
426 * c-style: whitesmith
427 * c-basic-offset: 8
428 * End:
429 */
430
431