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#ifndef lint
22static const char rcsid[] _U_ =
23    "@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.106 2008-02-06 10:47:53 guy Exp $ (LBL)";
24#endif
25
26#define NETDISSECT_REWORKED
27#ifdef HAVE_CONFIG_H
28#include "config.h"
29#endif
30
31#include <tcpdump-stdinc.h>
32
33#include <stdio.h>
34#include <pcap.h>
35
36#include "interface.h"
37#include "extract.h"
38#include "addrtoname.h"
39#include "ethertype.h"
40#include "ether.h"
41
42const struct tok ethertype_values[] = {
43    { ETHERTYPE_IP,		"IPv4" },
44    { ETHERTYPE_MPLS,		"MPLS unicast" },
45    { ETHERTYPE_MPLS_MULTI,	"MPLS multicast" },
46    { ETHERTYPE_IPV6,		"IPv6" },
47    { ETHERTYPE_8021Q,		"802.1Q" },
48    { ETHERTYPE_8021Q9100,	"802.1Q-9100" },
49    { ETHERTYPE_8021QinQ,	"802.1Q-QinQ" },
50    { ETHERTYPE_8021Q9200,	"802.1Q-9200" },
51    { ETHERTYPE_VMAN,		"VMAN" },
52    { ETHERTYPE_PUP,            "PUP" },
53    { ETHERTYPE_ARP,            "ARP"},
54    { ETHERTYPE_REVARP,         "Reverse ARP"},
55    { ETHERTYPE_NS,             "NS" },
56    { ETHERTYPE_SPRITE,         "Sprite" },
57    { ETHERTYPE_TRAIL,          "Trail" },
58    { ETHERTYPE_MOPDL,          "MOP DL" },
59    { ETHERTYPE_MOPRC,          "MOP RC" },
60    { ETHERTYPE_DN,             "DN" },
61    { ETHERTYPE_LAT,            "LAT" },
62    { ETHERTYPE_SCA,            "SCA" },
63    { ETHERTYPE_TEB,            "TEB" },
64    { ETHERTYPE_LANBRIDGE,      "Lanbridge" },
65    { ETHERTYPE_DECDNS,         "DEC DNS" },
66    { ETHERTYPE_DECDTS,         "DEC DTS" },
67    { ETHERTYPE_VEXP,           "VEXP" },
68    { ETHERTYPE_VPROD,          "VPROD" },
69    { ETHERTYPE_ATALK,          "Appletalk" },
70    { ETHERTYPE_AARP,           "Appletalk ARP" },
71    { ETHERTYPE_IPX,            "IPX" },
72    { ETHERTYPE_PPP,            "PPP" },
73    { ETHERTYPE_MPCP,           "MPCP" },
74    { ETHERTYPE_SLOW,           "Slow Protocols" },
75    { ETHERTYPE_PPPOED,         "PPPoE D" },
76    { ETHERTYPE_PPPOES,         "PPPoE S" },
77    { ETHERTYPE_EAPOL,          "EAPOL" },
78    { ETHERTYPE_RRCP,           "RRCP" },
79    { ETHERTYPE_JUMBO,          "Jumbo" },
80    { ETHERTYPE_LOOPBACK,       "Loopback" },
81    { ETHERTYPE_ISO,            "OSI" },
82    { ETHERTYPE_GRE_ISO,        "GRE-OSI" },
83    { ETHERTYPE_CFM_OLD,        "CFM (old)" },
84    { ETHERTYPE_CFM,            "CFM" },
85    { ETHERTYPE_LLDP,           "LLDP" },
86    { ETHERTYPE_TIPC,           "TIPC"},
87    { 0, NULL}
88};
89
90static inline void
91ether_hdr_print(netdissect_options *ndo,
92                const u_char *bp, u_int length)
93{
94	register const struct ether_header *ep;
95	u_int16_t ether_type;
96
97	ep = (const struct ether_header *)bp;
98
99	(void)ND_PRINT((ndo, "%s > %s",
100		     etheraddr_string(ESRC(ep)),
101		     etheraddr_string(EDST(ep))));
102
103	ether_type = EXTRACT_16BITS(&ep->ether_type);
104	if (!ndo->ndo_qflag) {
105	        if (ether_type <= ETHERMTU)
106		          (void)ND_PRINT((ndo, ", 802.3"));
107                else
108		          (void)ND_PRINT((ndo, ", ethertype %s (0x%04x)",
109				       tok2str(ethertype_values,"Unknown", ether_type),
110                                       ether_type));
111        } else {
112                if (ether_type <= ETHERMTU)
113                          (void)ND_PRINT((ndo, ", 802.3"));
114                else
115                          (void)ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type)));
116        }
117
118	(void)ND_PRINT((ndo, ", length %u: ", length));
119}
120
121/*
122 * Print an Ethernet frame.
123 * This might be encapsulated within another frame; we might be passed
124 * a pointer to a function that can print header information for that
125 * frame's protocol, and an argument to pass to that function.
126 */
127void
128ether_print(netdissect_options *ndo,
129            const u_char *p, u_int length, u_int caplen,
130            void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
131{
132	struct ether_header *ep;
133	u_int orig_length;
134	u_short ether_type;
135	u_short extracted_ether_type;
136
137	if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) {
138		ND_PRINT((ndo, "[|ether]"));
139		return;
140	}
141
142	if (ndo->ndo_eflag) {
143		if (print_encap_header != NULL)
144			(*print_encap_header)(ndo, encap_header_arg);
145		ether_hdr_print(ndo, p, length);
146	}
147	orig_length = length;
148
149	length -= ETHER_HDRLEN;
150	caplen -= ETHER_HDRLEN;
151	ep = (struct ether_header *)p;
152	p += ETHER_HDRLEN;
153
154	ether_type = EXTRACT_16BITS(&ep->ether_type);
155
156recurse:
157	/*
158	 * Is it (gag) an 802.3 encapsulation?
159	 */
160	if (ether_type <= ETHERMTU) {
161		/* Try to print the LLC-layer header & higher layers */
162		if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
163		    &extracted_ether_type) == 0) {
164			/* ether_type not known, print raw packet */
165			if (!ndo->ndo_eflag) {
166				if (print_encap_header != NULL)
167					(*print_encap_header)(ndo, encap_header_arg);
168				ether_hdr_print(ndo, (u_char *)ep, orig_length);
169			}
170
171			if (!ndo->ndo_suppress_default_print)
172				ndo->ndo_default_print(ndo, p, caplen);
173		}
174	} else if (ether_type == ETHERTYPE_8021Q  ||
175                ether_type == ETHERTYPE_8021Q9100 ||
176                ether_type == ETHERTYPE_8021Q9200 ||
177                ether_type == ETHERTYPE_8021QinQ) {
178		/*
179		 * Print VLAN information, and then go back and process
180		 * the enclosed type field.
181		 */
182		if (caplen < 4 || length < 4) {
183			ND_PRINT((ndo, "[|vlan]"));
184			return;
185		}
186	        if (ndo->ndo_eflag) {
187	        	u_int16_t tag = EXTRACT_16BITS(p);
188
189			ND_PRINT((ndo, "vlan %u, p %u%s, ",
190			    tag & 0xfff,
191			    tag >> 13,
192			    (tag & 0x1000) ? ", CFI" : ""));
193		}
194
195		ether_type = EXTRACT_16BITS(p + 2);
196		if (ndo->ndo_eflag && ether_type > ETHERMTU)
197			ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)));
198		p += 4;
199		length -= 4;
200		caplen -= 4;
201		goto recurse;
202	} else if (ether_type == ETHERTYPE_JUMBO) {
203		/*
204		 * Alteon jumbo frames.
205		 * See
206		 *
207		 *	http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
208		 *
209		 * which indicates that, following the type field,
210		 * there's an LLC header and payload.
211		 */
212		/* Try to print the LLC-layer header & higher layers */
213		if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
214		    &extracted_ether_type) == 0) {
215			/* ether_type not known, print raw packet */
216			if (!ndo->ndo_eflag) {
217				if (print_encap_header != NULL)
218					(*print_encap_header)(ndo, encap_header_arg);
219				ether_hdr_print(ndo, (u_char *)ep, orig_length);
220			}
221
222			if (!ndo->ndo_suppress_default_print)
223				ndo->ndo_default_print(ndo, p, caplen);
224		}
225	} else {
226		if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
227			/* ether_type not known, print raw packet */
228			if (!ndo->ndo_eflag) {
229				if (print_encap_header != NULL)
230					(*print_encap_header)(ndo, encap_header_arg);
231				ether_hdr_print(ndo, (u_char *)ep, orig_length);
232			}
233
234			if (!ndo->ndo_suppress_default_print)
235				ndo->ndo_default_print(ndo, p, caplen);
236		}
237	}
238}
239
240/*
241 * This is the top level routine of the printer.  'p' points
242 * to the ether header of the packet, 'h->ts' is the timestamp,
243 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
244 * is the number of bytes actually captured.
245 */
246u_int
247ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
248               const u_char *p)
249{
250	ether_print(ndo, p, h->len, h->caplen, NULL, NULL);
251
252	return (ETHER_HDRLEN);
253}
254
255/*
256 * This is the top level routine of the printer.  'p' points
257 * to the ether header of the packet, 'h->ts' is the timestamp,
258 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
259 * is the number of bytes actually captured.
260 *
261 * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
262 * before the Ethernet header.
263 */
264u_int
265netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
266                     const u_char *p)
267{
268	/*
269	 * Fail if we don't have enough data for the Hilscher pseudo-header.
270	 */
271	if (h->len < 4 || h->caplen < 4) {
272		printf("[|netanalyzer]");
273		return (h->caplen);
274	}
275
276	/* Skip the pseudo-header. */
277	ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL);
278
279	return (4 + ETHER_HDRLEN);
280}
281
282/*
283 * This is the top level routine of the printer.  'p' points
284 * to the ether header of the packet, 'h->ts' is the timestamp,
285 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
286 * is the number of bytes actually captured.
287 *
288 * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
289 * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
290 * before the Ethernet header.
291 */
292u_int
293netanalyzer_transparent_if_print(netdissect_options *ndo,
294                                 const struct pcap_pkthdr *h,
295                                 const u_char *p)
296{
297	/*
298	 * Fail if we don't have enough data for the Hilscher pseudo-header,
299	 * preamble, and SOF.
300	 */
301	if (h->len < 12 || h->caplen < 12) {
302		printf("[|netanalyzer-transparent]");
303		return (h->caplen);
304	}
305
306	/* Skip the pseudo-header, preamble, and SOF. */
307	ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL);
308
309	return (12 + ETHER_HDRLEN);
310}
311
312/*
313 * Prints the packet payload, given an Ethernet type code for the payload's
314 * protocol.
315 *
316 * Returns non-zero if it can do so, zero if the ethertype is unknown.
317 */
318
319int
320ethertype_print(netdissect_options *ndo,
321                u_short ether_type, const u_char *p,
322                u_int length, u_int caplen)
323{
324	switch (ether_type) {
325
326	case ETHERTYPE_IP:
327	        ip_print(ndo, p, length);
328		return (1);
329
330#ifdef INET6
331	case ETHERTYPE_IPV6:
332		ip6_print(ndo, p, length);
333		return (1);
334#endif /*INET6*/
335
336	case ETHERTYPE_ARP:
337	case ETHERTYPE_REVARP:
338  	        arp_print(ndo, p, length, caplen);
339		return (1);
340
341	case ETHERTYPE_DN:
342		decnet_print(/*ndo,*/p, length, caplen);
343		return (1);
344
345	case ETHERTYPE_ATALK:
346		if (ndo->ndo_vflag)
347			fputs("et1 ", stdout);
348		atalk_print(/*ndo,*/p, length);
349		return (1);
350
351	case ETHERTYPE_AARP:
352		aarp_print(/*ndo,*/p, length);
353		return (1);
354
355	case ETHERTYPE_IPX:
356		ND_PRINT((ndo, "(NOV-ETHII) "));
357		ipx_print(/*ndo,*/p, length);
358		return (1);
359
360        case ETHERTYPE_ISO:
361                isoclns_print(/*ndo,*/p+1, length-1, length-1);
362                return(1);
363
364	case ETHERTYPE_PPPOED:
365	case ETHERTYPE_PPPOES:
366	case ETHERTYPE_PPPOED2:
367	case ETHERTYPE_PPPOES2:
368		pppoe_print(/*ndo,*/p, length);
369		return (1);
370
371	case ETHERTYPE_EAPOL:
372	        eap_print(ndo, p, length);
373		return (1);
374
375	case ETHERTYPE_RRCP:
376	        rrcp_print(ndo, p - 14 , length + 14);
377		return (1);
378
379	case ETHERTYPE_PPP:
380		if (length) {
381			printf(": ");
382			ppp_print(/*ndo,*/p, length);
383		}
384		return (1);
385
386	case ETHERTYPE_MPCP:
387	        mpcp_print(/*ndo,*/p, length);
388		return (1);
389
390	case ETHERTYPE_SLOW:
391	        slow_print(/*ndo,*/p, length);
392		return (1);
393
394	case ETHERTYPE_CFM:
395	case ETHERTYPE_CFM_OLD:
396	        cfm_print(/*ndo,*/p, length);
397		return (1);
398
399	case ETHERTYPE_LLDP:
400	        lldp_print(/*ndo,*/p, length);
401		return (1);
402
403        case ETHERTYPE_LOOPBACK:
404                return (1);
405
406	case ETHERTYPE_MPLS:
407	case ETHERTYPE_MPLS_MULTI:
408		mpls_print(/*ndo,*/p, length);
409		return (1);
410
411	case ETHERTYPE_TIPC:
412		tipc_print(ndo, p, length, caplen);
413		return (1);
414
415	case ETHERTYPE_LAT:
416	case ETHERTYPE_SCA:
417	case ETHERTYPE_MOPRC:
418	case ETHERTYPE_MOPDL:
419		/* default_print for now */
420	default:
421		return (0);
422	}
423}
424
425
426/*
427 * Local Variables:
428 * c-style: whitesmith
429 * c-basic-offset: 8
430 * End:
431 */
432
433