2 * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
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
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.
21 * Code by Matt Thomas, Digital Equipment Corporation
22 * with an awful lot of hacking by Jeffrey Mogul, DECWRL
26 static const char rcsid[] _U_ =
27 "@(#) $Header: /tcpdump/master/tcpdump/print-llc.c,v 1.61.2.4 2005/04/26 07:27:16 guy Exp $";
34 #include <tcpdump-stdinc.h>
39 #include "interface.h"
40 #include "addrtoname.h"
41 #include "extract.h" /* must come after interface.h */
44 #include "ethertype.h"
47 static struct tok llc_values[] = {
48 { LLCSAP_NULL, "Null" },
49 { LLCSAP_GLOBAL, "Global" },
50 { LLCSAP_8021B_I, "802.1B I" },
51 { LLCSAP_8021B_G, "802.1B G" },
53 { LLCSAP_PROWAYNM, "ProWay NM" },
54 { LLCSAP_8021D, "STP" },
55 { LLCSAP_RS511, "RS511" },
56 { LLCSAP_ISO8208, "ISO8208" },
57 { LLCSAP_PROWAY, "ProWay" },
58 { LLCSAP_SNAP, "SNAP" },
59 { LLCSAP_IPX, "IPX" },
60 { LLCSAP_NETBEUI, "NetBeui" },
61 { LLCSAP_ISONS, "OSI" },
65 static struct tok cmd2str[] = {
72 { LLC_SABME, "sabme" },
77 static const struct tok cisco_values[] = {
78 { PID_CISCO_CDP, "CDP" },
82 static const struct tok bridged_values[] = {
83 { PID_RFC2684_ETH_FCS, "Ethernet + FCS" },
84 { PID_RFC2684_ETH_NOFCS, "Ethernet w/o FCS" },
85 { PID_RFC2684_802_4_FCS, "802.4 + FCS" },
86 { PID_RFC2684_802_4_NOFCS, "802.4 w/o FCS" },
87 { PID_RFC2684_802_5_FCS, "Token Ring + FCS" },
88 { PID_RFC2684_802_5_NOFCS, "Token Ring w/o FCS" },
89 { PID_RFC2684_FDDI_FCS, "FDDI + FCS" },
90 { PID_RFC2684_FDDI_NOFCS, "FDDI w/o FCS" },
91 { PID_RFC2684_802_6_FCS, "802.6 + FCS" },
92 { PID_RFC2684_802_6_NOFCS, "802.6 w/o FCS" },
93 { PID_RFC2684_BPDU, "BPDU" },
99 const struct tok *tok;
102 static const struct oui_tok oui_to_tok[] = {
103 { OUI_ENCAP_ETHER, ethertype_values },
104 { OUI_CISCO_90, ethertype_values }, /* uses some Ethertype values */
105 { OUI_APPLETALK, ethertype_values }, /* uses some Ethertype values */
106 { OUI_CISCO, cisco_values },
107 { OUI_RFC2684, bridged_values }, /* bridged, RFC 2427 FR or RFC 2864 ATM */
112 * Returns non-zero IFF it succeeds in printing the header
115 llc_print(const u_char *p, u_int length, u_int caplen,
116 const u_char *esrc, const u_char *edst, u_short *extracted_ethertype)
124 (void)printf("[|llc]");
125 default_print((u_char *)p, caplen);
133 * OK, what type of LLC frame is this? The length
134 * of the control field depends on that - I frames
135 * have a two-byte control field, and U frames have
136 * a one-byte control field.
139 if ((control & LLC_U_FMT) == LLC_U_FMT) {
146 * The control field in I and S frames is
150 (void)printf("[|llc]");
151 default_print((u_char *)p, caplen);
156 * ...and is little-endian.
158 control = EXTRACT_LE_16BITS(p + 2);
162 #if !defined(EMBED) || defined(CONFIG_IPX) || defined(CONFIG_IPX_MODULE)
163 if (ssap == LLCSAP_GLOBAL && dsap == LLCSAP_GLOBAL) {
165 * This is an Ethernet_802.3 IPX frame; it has an
166 * 802.3 header (i.e., an Ethernet header where the
167 * type/length field is <= ETHERMTU, i.e. it's a length
168 * field, not a type field), but has no 802.2 header -
169 * the IPX packet starts right after the Ethernet header,
170 * with a signature of two bytes of 0xFF (which is
173 * (It might also have been an Ethernet_802.3 IPX at
174 * one time, but got bridged onto another network,
175 * such as an 802.11 network; this has appeared in at
176 * least one capture file.)
180 printf("IPX-802.3: ");
182 ipx_print(p, length);
189 printf("LLC, dsap %s (0x%02x), ssap %s (0x%02x), cmd 0x%02x: ",
190 tok2str(llc_values, "Unknown", dsap),
192 tok2str(llc_values, "Unknown", ssap),
196 printf("LLC, dsap %s (0x%02x), ssap %s (0x%02x), cmd 0x%04x: ",
197 tok2str(llc_values, "Unknown", dsap),
199 tok2str(llc_values, "Unknown", ssap),
205 #if !defined(EMBED) || defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
206 if (ssap == LLCSAP_8021D && dsap == LLCSAP_8021D &&
208 stp_print(p+3, length-3);
213 if (ssap == LLCSAP_IP && dsap == LLCSAP_IP &&
215 ip_print(gndo, p+4, length-4);
219 #if !defined(EMBED) || defined(CONFIG_IPX) || defined(CONFIG_IPX_MODULE)
220 if (ssap == LLCSAP_IPX && dsap == LLCSAP_IPX &&
223 * This is an Ethernet_802.2 IPX frame, with an 802.3
224 * header and an 802.2 LLC header with the source and
225 * destination SAPs being the IPX SAP.
227 * Skip DSAP, LSAP, and control field.
229 printf("(NOV-802.2) ");
230 ipx_print(p+3, length-3);
235 #ifdef TCPDUMP_DO_SMB
236 if (ssap == LLCSAP_NETBEUI && dsap == LLCSAP_NETBEUI
237 && (!(control & LLC_S_FMT) || control == LLC_U_FMT)) {
239 * we don't actually have a full netbeui parser yet, but the
240 * smb parser can handle many smb-in-netbeui packets, which
241 * is very useful, so we call that
243 * We don't call it for S frames, however, just I frames
244 * (which are frames that don't have the low-order bit,
245 * LLC_S_FMT, set in the first byte of the control field)
246 * and UI frames (whose control field is just 3, LLC_U_FMT).
250 * Skip the LLC header.
261 netbeui_print(control, p, length);
266 if (ssap == LLCSAP_ISONS && dsap == LLCSAP_ISONS
267 && control == LLC_UI) {
268 isoclns_print(p + 3, length - 3, caplen - 3);
273 if (ssap == LLCSAP_SNAP && dsap == LLCSAP_SNAP
274 && control == LLC_UI) {
276 * XXX - what *is* the right bridge pad value here?
277 * Does anybody ever bridge one form of LAN traffic
278 * over a networking type that uses 802.2 LLC?
280 ret = snap_print(p+3, length-3, caplen-3, extracted_ethertype,
287 if ((ssap & ~LLC_GSAP) == dsap) {
288 if (esrc == NULL || edst == NULL)
289 (void)printf("%s ", llcsap_string(dsap));
291 (void)printf("%s > %s %s ",
292 etheraddr_string(esrc),
293 etheraddr_string(edst),
294 llcsap_string(dsap));
296 if (esrc == NULL || edst == NULL)
297 (void)printf("%s > %s ",
298 llcsap_string(ssap & ~LLC_GSAP),
299 llcsap_string(dsap));
301 (void)printf("%s %s > %s %s ",
302 etheraddr_string(esrc),
303 llcsap_string(ssap & ~LLC_GSAP),
304 etheraddr_string(edst),
305 llcsap_string(dsap));
313 m = tok2str(cmd2str, "%02x", LLC_U_CMD(control));
314 switch ((ssap & LLC_GSAP) | (control & LLC_U_POLL)) {
315 case 0: f = 'C'; break;
316 case LLC_GSAP: f = 'R'; break;
317 case LLC_U_POLL: f = 'P'; break;
318 case LLC_GSAP|LLC_U_POLL: f = 'F'; break;
319 default: f = '?'; break;
322 printf("%s/%c", m, f);
328 if ((control & ~LLC_U_POLL) == LLC_XID) {
329 if (*p == LLC_XID_FI) {
330 printf(": %02x %02x", p[1], p[2]);
339 switch ((ssap & LLC_GSAP) | (control & LLC_IS_POLL)) {
340 case 0: f = 'C'; break;
341 case LLC_GSAP: f = 'R'; break;
342 case LLC_IS_POLL: f = 'P'; break;
343 case LLC_GSAP|LLC_IS_POLL: f = 'F'; break;
344 default: f = '?'; break;
347 if ((control & LLC_S_FMT) == LLC_S_FMT) {
348 static const char *llc_s[] = { "rr", "rej", "rnr", "03" };
349 (void)printf("%s (r=%d,%c)",
350 llc_s[LLC_S_CMD(control)],
354 (void)printf("I (s=%d,r=%d,%c)",
367 snap_print(const u_char *p, u_int length, u_int caplen,
368 u_short *extracted_ethertype, u_int bridge_pad)
375 orgcode = EXTRACT_24BITS(p);
376 et = EXTRACT_16BITS(p + 3);
379 const struct tok *tok = NULL;
380 const struct oui_tok *otp;
382 for (otp = &oui_to_tok[0]; otp->tok != NULL; otp++) {
383 if (otp->oui == orgcode) {
388 (void)printf("oui %s (0x%06x), %s %s (0x%04x): ",
389 tok2str(oui_values, "Unknown", orgcode),
391 (orgcode == 0x000000 ? "ethertype" : "pid"),
392 tok2str(tok, "Unknown", et),
400 case OUI_ENCAP_ETHER:
403 * This is an encapsulated Ethernet packet,
404 * or a packet bridged by some piece of
405 * Cisco hardware; the protocol ID is
406 * an Ethernet protocol type.
408 ret = ether_encap_print(et, p, length, caplen,
409 extracted_ethertype);
414 #if !defined(EMBED) || defined(CONFIG_ATALK) || defined(CONFIG_ATALK_MODULE)
416 if (et == ETHERTYPE_ATALK) {
418 * No, I have no idea why Apple used one
419 * of their own OUIs, rather than
420 * 0x000000, and an Ethernet packet
421 * type, for Appletalk data packets,
422 * but used 0x000000 and an Ethernet
423 * packet type for AARP packets.
425 ret = ether_encap_print(et, p, length, caplen,
426 extracted_ethertype);
435 if (et == PID_CISCO_CDP) {
436 cdp_print(p, length, caplen);
445 case PID_RFC2684_ETH_FCS:
446 case PID_RFC2684_ETH_NOFCS:
448 * XXX - remove the last two bytes for
449 * PID_RFC2684_ETH_FCS?
454 TCHECK2(*p, bridge_pad);
455 caplen -= bridge_pad;
456 length -= bridge_pad;
460 * What remains is an Ethernet packet.
462 ether_print(p, length, caplen);
465 #if !defined(EMBED) || defined(CONFIG_TR) || defined(CONFIG_TR_MODULE)
466 case PID_RFC2684_802_5_FCS:
467 case PID_RFC2684_802_5_NOFCS:
469 * XXX - remove the last two bytes for
470 * PID_RFC2684_ETH_FCS?
473 * Skip the padding, but not the Access
476 TCHECK2(*p, bridge_pad);
477 caplen -= bridge_pad;
478 length -= bridge_pad;
482 * What remains is an 802.5 Token Ring
485 token_print(p, length, caplen);
489 #if !defined(EMBED) || defined(CONFIG_FDDI) || defined(CONFIG_FDDI_MODULE)
490 case PID_RFC2684_FDDI_FCS:
491 case PID_RFC2684_FDDI_NOFCS:
493 * XXX - remove the last two bytes for
494 * PID_RFC2684_ETH_FCS?
499 TCHECK2(*p, bridge_pad + 1);
500 caplen -= bridge_pad + 1;
501 length -= bridge_pad + 1;
505 * What remains is an FDDI packet.
507 fddi_print(p, length, caplen);
511 #if !defined(EMBED) || defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
512 case PID_RFC2684_BPDU:
513 stp_print(p, length);
521 (void)printf("[|snap]");
528 * c-style: whitesmith