bc4198501ab779f24c76efd888fb0767e6712f41
[dragonfly.git] / contrib / tcpdump-3.9 / print-llc.c
1 /*
2  * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
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  * Code by Matt Thomas, Digital Equipment Corporation
22  *      with an awful lot of hacking by Jeffrey Mogul, DECWRL
23  */
24
25 #ifndef lint
26 static const char rcsid[] _U_ =
27     "@(#) $Header: /tcpdump/master/tcpdump/print-llc.c,v 1.61.2.10 2007/02/08 07:07:51 guy Exp $";
28 #endif
29
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33
34 #include <tcpdump-stdinc.h>
35
36 #include <stdio.h>
37 #include <string.h>
38
39 #include "interface.h"
40 #include "addrtoname.h"
41 #include "extract.h"                    /* must come after interface.h */
42
43 #include "llc.h"
44 #include "ethertype.h"
45 #include "oui.h"
46
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" },
52         { LLCSAP_IP,       "IP" },
53         { LLCSAP_SNA,      "SNA" },
54         { LLCSAP_PROWAYNM, "ProWay NM" },
55         { LLCSAP_8021D,    "STP" },
56         { LLCSAP_RS511,    "RS511" },
57         { LLCSAP_ISO8208,  "ISO8208" },
58         { LLCSAP_PROWAY,   "ProWay" },
59         { LLCSAP_SNAP,     "SNAP" },
60         { LLCSAP_IPX,      "IPX" },
61         { LLCSAP_NETBEUI,  "NetBeui" },
62         { LLCSAP_ISONS,    "OSI" },
63         { 0,               NULL },
64 };
65
66 static struct tok llc_cmd_values[] = {
67         { LLC_UI,       "ui" },
68         { LLC_TEST,     "test" },
69         { LLC_XID,      "xid" },
70         { LLC_UA,       "ua" },
71         { LLC_DISC,     "disc" },
72         { LLC_DM,       "dm" },
73         { LLC_SABME,    "sabme" },
74         { LLC_FRMR,     "frmr" },
75         { 0,            NULL }
76 };
77
78 static const struct tok llc_flag_values[] = { 
79         { 0, "Command" },
80         { LLC_GSAP, "Response" },
81         { LLC_U_POLL, "Poll" },
82         { LLC_GSAP|LLC_U_POLL, "Final" },
83         { LLC_IS_POLL, "Poll" },
84         { LLC_GSAP|LLC_IS_POLL, "Final" },
85         { 0, NULL }
86 };
87
88
89 static const struct tok llc_ig_flag_values[] = { 
90         { 0, "Individual" },
91         { LLC_IG, "Group" },
92         { 0, NULL }
93 };
94
95
96 static const struct tok llc_supervisory_values[] = { 
97         { 0, "Receiver Ready" },
98         { 1, "Receiver not Ready" },
99         { 2, "Reject" },
100         { 0,             NULL }
101 };
102
103
104 static const struct tok cisco_values[] = { 
105         { PID_CISCO_CDP, "CDP" },
106         { PID_CISCO_VTP, "VTP" },
107         { PID_CISCO_DTP, "DTP" },
108         { 0,             NULL }
109 };
110
111 static const struct tok bridged_values[] = { 
112         { PID_RFC2684_ETH_FCS,     "Ethernet + FCS" },
113         { PID_RFC2684_ETH_NOFCS,   "Ethernet w/o FCS" },
114         { PID_RFC2684_802_4_FCS,   "802.4 + FCS" },
115         { PID_RFC2684_802_4_NOFCS, "802.4 w/o FCS" },
116         { PID_RFC2684_802_5_FCS,   "Token Ring + FCS" },
117         { PID_RFC2684_802_5_NOFCS, "Token Ring w/o FCS" },
118         { PID_RFC2684_FDDI_FCS,    "FDDI + FCS" },
119         { PID_RFC2684_FDDI_NOFCS,  "FDDI w/o FCS" },
120         { PID_RFC2684_802_6_FCS,   "802.6 + FCS" },
121         { PID_RFC2684_802_6_NOFCS, "802.6 w/o FCS" },
122         { PID_RFC2684_BPDU,        "BPDU" },
123         { 0,                       NULL },
124 };
125
126 static const struct tok null_values[] = { 
127         { 0,             NULL }
128 };
129
130 struct oui_tok {
131         u_int32_t       oui;
132         const struct tok *tok;
133 };
134
135 static const struct oui_tok oui_to_tok[] = {
136         { OUI_ENCAP_ETHER, ethertype_values },
137         { OUI_CISCO_90, ethertype_values },     /* uses some Ethertype values */
138         { OUI_APPLETALK, ethertype_values },    /* uses some Ethertype values */
139         { OUI_CISCO, cisco_values },
140         { OUI_RFC2684, bridged_values },        /* bridged, RFC 2427 FR or RFC 2864 ATM */
141         { 0, NULL }
142 };
143
144 /*
145  * Returns non-zero IFF it succeeds in printing the header
146  */
147 int
148 llc_print(const u_char *p, u_int length, u_int caplen,
149           const u_char *esrc, const u_char *edst, u_short *extracted_ethertype)
150 {
151         u_int8_t dsap_field, dsap, ssap_field, ssap;
152         u_int16_t control;
153         int is_u;
154         register int ret;
155
156         *extracted_ethertype = 0;
157
158         if (caplen < 3) {
159                 (void)printf("[|llc]");
160                 default_print((u_char *)p, caplen);
161                 return(0);
162         }
163
164         dsap_field = *p;
165         ssap_field = *(p + 1);
166
167         /*
168          * OK, what type of LLC frame is this?  The length
169          * of the control field depends on that - I frames
170          * have a two-byte control field, and U frames have
171          * a one-byte control field.
172          */
173         control = *(p + 2);
174         if ((control & LLC_U_FMT) == LLC_U_FMT) {
175                 /*
176                  * U frame.
177                  */
178                 is_u = 1;
179         } else {
180                 /*
181                  * The control field in I and S frames is
182                  * 2 bytes...
183                  */
184                 if (caplen < 4) {
185                         (void)printf("[|llc]");
186                         default_print((u_char *)p, caplen);
187                         return(0);
188                 }
189
190                 /*
191                  * ...and is little-endian.
192                  */
193                 control = EXTRACT_LE_16BITS(p + 2);
194                 is_u = 0;
195         }
196
197         if (ssap_field == LLCSAP_GLOBAL && dsap_field == LLCSAP_GLOBAL) {
198                 /*
199                  * This is an Ethernet_802.3 IPX frame; it has an
200                  * 802.3 header (i.e., an Ethernet header where the
201                  * type/length field is <= ETHERMTU, i.e. it's a length
202                  * field, not a type field), but has no 802.2 header -
203                  * the IPX packet starts right after the Ethernet header,
204                  * with a signature of two bytes of 0xFF (which is
205                  * LLCSAP_GLOBAL).
206                  *
207                  * (It might also have been an Ethernet_802.3 IPX at
208                  * one time, but got bridged onto another network,
209                  * such as an 802.11 network; this has appeared in at
210                  * least one capture file.)
211                  */
212
213             if (eflag)
214                 printf("IPX 802.3: ");
215
216             ipx_print(p, length);
217             return (1);
218         }
219
220         dsap = dsap_field & ~LLC_IG;
221         ssap = ssap_field & ~LLC_GSAP;
222
223         if (eflag) {
224                 printf("LLC, dsap %s (0x%02x) %s, ssap %s (0x%02x) %s",
225                        tok2str(llc_values, "Unknown", dsap),
226                        dsap,
227                        tok2str(llc_ig_flag_values, "Unknown", dsap_field & LLC_IG),
228                        tok2str(llc_values, "Unknown", ssap),
229                        ssap,
230                        tok2str(llc_flag_values, "Unknown", ssap_field & LLC_GSAP));
231
232                 if (is_u) {
233                         printf(", ctrl 0x%02x: ", control);
234                 } else {
235                         printf(", ctrl 0x%04x: ", control);
236                 }
237         }
238
239         if (ssap == LLCSAP_8021D && dsap == LLCSAP_8021D &&
240             control == LLC_UI) {
241                 stp_print(p+3, length-3);
242                 return (1);
243         }
244
245         if (ssap == LLCSAP_IP && dsap == LLCSAP_IP &&
246             control == LLC_UI) {
247                 ip_print(gndo, p+4, length-4);
248                 return (1);
249         }
250
251         if (ssap == LLCSAP_IPX && dsap == LLCSAP_IPX &&
252             control == LLC_UI) {
253                 /*
254                  * This is an Ethernet_802.2 IPX frame, with an 802.3
255                  * header and an 802.2 LLC header with the source and
256                  * destination SAPs being the IPX SAP.
257                  *
258                  * Skip DSAP, LSAP, and control field.
259                  */
260                 if (eflag)
261                         printf("IPX 802.2: ");
262
263                 ipx_print(p+3, length-3);
264                 return (1);
265         }
266
267 #ifdef TCPDUMP_DO_SMB
268         if (ssap == LLCSAP_NETBEUI && dsap == LLCSAP_NETBEUI
269             && (!(control & LLC_S_FMT) || control == LLC_U_FMT)) {
270                 /*
271                  * we don't actually have a full netbeui parser yet, but the
272                  * smb parser can handle many smb-in-netbeui packets, which
273                  * is very useful, so we call that
274                  *
275                  * We don't call it for S frames, however, just I frames
276                  * (which are frames that don't have the low-order bit,
277                  * LLC_S_FMT, set in the first byte of the control field)
278                  * and UI frames (whose control field is just 3, LLC_U_FMT).
279                  */
280
281                 /*
282                  * Skip the LLC header.
283                  */
284                 if (is_u) {
285                         p += 3;
286                         length -= 3;
287                         caplen -= 3;
288                 } else {
289                         p += 4;
290                         length -= 4;
291                         caplen -= 4;
292                 }
293                 netbeui_print(control, p, length);
294                 return (1);
295         }
296 #endif
297         if (ssap == LLCSAP_ISONS && dsap == LLCSAP_ISONS
298             && control == LLC_UI) {
299                 isoclns_print(p + 3, length - 3, caplen - 3);
300                 return (1);
301         }
302
303         if (ssap == LLCSAP_SNAP && dsap == LLCSAP_SNAP
304             && control == LLC_UI) {
305                 /*
306                  * XXX - what *is* the right bridge pad value here?
307                  * Does anybody ever bridge one form of LAN traffic
308                  * over a networking type that uses 802.2 LLC?
309                  */
310                 ret = snap_print(p+3, length-3, caplen-3, extracted_ethertype,
311                     2);
312                 if (ret)
313                         return (ret);
314         }
315
316         if (!eflag) {
317                 if (ssap == dsap) {
318                         if (esrc == NULL || edst == NULL)
319                                 (void)printf("%s ", tok2str(llc_values, "Unknown DSAP 0x%02x", dsap));
320                         else
321                                 (void)printf("%s > %s %s ",
322                                                 etheraddr_string(esrc),
323                                                 etheraddr_string(edst),
324                                                 tok2str(llc_values, "Unknown DSAP 0x%02x", dsap));
325                 } else {
326                         if (esrc == NULL || edst == NULL)
327                                 (void)printf("%s > %s ",
328                                         tok2str(llc_values, "Unknown SSAP 0x%02x", ssap),
329                                         tok2str(llc_values, "Unknown DSAP 0x%02x", dsap));
330                         else
331                                 (void)printf("%s %s > %s %s ",
332                                         etheraddr_string(esrc),
333                                         tok2str(llc_values, "Unknown SSAP 0x%02x", ssap),
334                                         etheraddr_string(edst),
335                                         tok2str(llc_values, "Unknown DSAP 0x%02x", dsap));
336                 }
337         }
338
339         if (is_u) {
340                 printf("Unnumbered, %s, Flags [%s], length %u",
341                        tok2str(llc_cmd_values, "%02x", LLC_U_CMD(control)),
342                        tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_U_POLL)),
343                        length);
344
345                 p += 3;
346                 length -= 3;
347                 caplen -= 3;
348
349                 if ((control & ~LLC_U_POLL) == LLC_XID) {
350                         if (*p == LLC_XID_FI) {
351                                 printf(": %02x %02x", p[1], p[2]);
352                                 p += 3;
353                                 length -= 3;
354                                 caplen -= 3;
355                         }
356                 }
357         } else {
358                 if ((control & LLC_S_FMT) == LLC_S_FMT) {
359                         (void)printf("Supervisory, %s, rcv seq %u, Flags [%s], length %u",
360                                 tok2str(llc_supervisory_values,"?",LLC_S_CMD(control)),
361                                 LLC_IS_NR(control),
362                                 tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_IS_POLL)),
363                                 length);
364                 } else {
365                         (void)printf("Information, send seq %u, rcv seq %u, Flags [%s], length %u",
366                                 LLC_I_NS(control),
367                                 LLC_IS_NR(control),
368                                 tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_IS_POLL)),
369                                 length);
370                 }
371                 p += 4;
372                 length -= 4;
373                 caplen -= 4;
374         }
375         return(1);
376 }
377
378 int
379 snap_print(const u_char *p, u_int length, u_int caplen,
380     u_short *extracted_ethertype, u_int bridge_pad)
381 {
382         u_int32_t orgcode;
383         register u_short et;
384         register int ret;
385
386         TCHECK2(*p, 5);
387         orgcode = EXTRACT_24BITS(p);
388         et = EXTRACT_16BITS(p + 3);
389
390         if (eflag) {
391                 const struct tok *tok = null_values;
392                 const struct oui_tok *otp;
393
394                 for (otp = &oui_to_tok[0]; otp->tok != NULL; otp++) {
395                         if (otp->oui == orgcode) {
396                                 tok = otp->tok;
397                                 break;
398                         }
399                 }
400                 (void)printf("oui %s (0x%06x), %s %s (0x%04x): ",
401                      tok2str(oui_values, "Unknown", orgcode),
402                      orgcode,
403                      (orgcode == 0x000000 ? "ethertype" : "pid"),
404                      tok2str(tok, "Unknown", et),
405                      et);
406         }
407         p += 5;
408         length -= 5;
409         caplen -= 5;
410
411         switch (orgcode) {
412         case OUI_ENCAP_ETHER:
413         case OUI_CISCO_90:
414                 /*
415                  * This is an encapsulated Ethernet packet,
416                  * or a packet bridged by some piece of
417                  * Cisco hardware; the protocol ID is
418                  * an Ethernet protocol type.
419                  */
420                 ret = ether_encap_print(et, p, length, caplen,
421                     extracted_ethertype);
422                 if (ret)
423                         return (ret);
424                 break;
425
426         case OUI_APPLETALK:
427                 if (et == ETHERTYPE_ATALK) {
428                         /*
429                          * No, I have no idea why Apple used one
430                          * of their own OUIs, rather than
431                          * 0x000000, and an Ethernet packet
432                          * type, for Appletalk data packets,
433                          * but used 0x000000 and an Ethernet
434                          * packet type for AARP packets.
435                          */
436                         ret = ether_encap_print(et, p, length, caplen,
437                             extracted_ethertype);
438                         if (ret)
439                                 return (ret);
440                 }
441                 break;
442
443         case OUI_CISCO:
444                 if (et == PID_CISCO_CDP) {
445                         cdp_print(p, length, caplen);
446                         return (1);
447                 }
448                 break;
449
450         case OUI_RFC2684:
451                 switch (et) {
452
453                 case PID_RFC2684_ETH_FCS:
454                 case PID_RFC2684_ETH_NOFCS:
455                         /*
456                          * XXX - remove the last two bytes for
457                          * PID_RFC2684_ETH_FCS?
458                          */
459                         /*
460                          * Skip the padding.
461                          */
462                         TCHECK2(*p, bridge_pad);
463                         caplen -= bridge_pad;
464                         length -= bridge_pad;
465                         p += bridge_pad;
466
467                         /*
468                          * What remains is an Ethernet packet.
469                          */
470                         ether_print(p, length, caplen);
471                         return (1);
472
473                 case PID_RFC2684_802_5_FCS:
474                 case PID_RFC2684_802_5_NOFCS:
475                         /*
476                          * XXX - remove the last two bytes for
477                          * PID_RFC2684_ETH_FCS?
478                          */
479                         /*
480                          * Skip the padding, but not the Access
481                          * Control field.
482                          */
483                         TCHECK2(*p, bridge_pad);
484                         caplen -= bridge_pad;
485                         length -= bridge_pad;
486                         p += bridge_pad;
487
488                         /*
489                          * What remains is an 802.5 Token Ring
490                          * packet.
491                          */
492                         token_print(p, length, caplen);
493                         return (1);
494
495                 case PID_RFC2684_FDDI_FCS:
496                 case PID_RFC2684_FDDI_NOFCS:
497                         /*
498                          * XXX - remove the last two bytes for
499                          * PID_RFC2684_ETH_FCS?
500                          */
501                         /*
502                          * Skip the padding.
503                          */
504                         TCHECK2(*p, bridge_pad + 1);
505                         caplen -= bridge_pad + 1;
506                         length -= bridge_pad + 1;
507                         p += bridge_pad + 1;
508
509                         /*
510                          * What remains is an FDDI packet.
511                          */
512                         fddi_print(p, length, caplen);
513                         return (1);
514
515                 case PID_RFC2684_BPDU:
516                         stp_print(p, length);
517                         return (1);
518                 }
519         }
520         return (0);
521
522 trunc:
523         (void)printf("[|snap]");
524         return (1);
525 }
526
527
528 /*
529  * Local Variables:
530  * c-style: whitesmith
531  * c-basic-offset: 8
532  * End:
533  */