1 /* $NetBSD: pcap-common.c,v 1.4 2015/08/28 11:20:55 joerg Exp $ */
2
3 /*
4 * Copyright (c) 1993, 1994, 1995, 1996, 1997
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that: (1) source code distributions
9 * retain the above copyright notice and this paragraph in its entirety, (2)
10 * distributions including binary code include the above copyright notice and
11 * this paragraph in its entirety in the documentation or other materials
12 * provided with the distribution, and (3) all advertising materials mentioning
13 * features or use of this software display the following acknowledgement:
14 * ``This product includes software developed by the University of California,
15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
16 * the University nor the names of its contributors may be used to endorse
17 * or promote products derived from this software without specific prior
18 * written permission.
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22 *
23 * pcap-common.c - common code for pcap and pcap-ng files
24 */
25
26 #include <sys/cdefs.h>
27 __RCSID("$NetBSD: pcap-common.c,v 1.4 2015/08/28 11:20:55 joerg Exp $");
28
29 #ifdef HAVE_CONFIG_H
30 #include "config.h"
31 #endif
32
33 #ifdef WIN32
34 #include <pcap-stdinc.h>
35 #else /* WIN32 */
36 #if HAVE_INTTYPES_H
37 #include <inttypes.h>
38 #elif HAVE_STDINT_H
39 #include <stdint.h>
40 #endif
41 #ifdef HAVE_SYS_BITYPES_H
42 #include <sys/bitypes.h>
43 #endif
44 #include <sys/types.h>
45 #endif /* WIN32 */
46
47 #include "pcap-int.h"
48 #include "pcap/usb.h"
49 #include "pcap/nflog.h"
50
51 #include "pcap-common.h"
52
53 /*
54 * We don't write DLT_* values to capture files, because they're not the
55 * same on all platforms.
56 *
57 * Unfortunately, the various flavors of BSD have not always used the same
58 * numerical values for the same data types, and various patches to
59 * libpcap for non-BSD OSes have added their own DLT_* codes for link
60 * layer encapsulation types seen on those OSes, and those codes have had,
61 * in some cases, values that were also used, on other platforms, for other
62 * link layer encapsulation types.
63 *
64 * This means that capture files of a type whose numerical DLT_* code
65 * means different things on different BSDs, or with different versions
66 * of libpcap, can't always be read on systems other than those like
67 * the one running on the machine on which the capture was made.
68 *
69 * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes
70 * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_*
71 * codes to DLT_* codes when reading a savefile header.
72 *
73 * For those DLT_* codes that have, as far as we know, the same values on
74 * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as
75 * DLT_xxx; that way, captures of those types can still be read by
76 * versions of libpcap that map LINKTYPE_* values to DLT_* values, and
77 * captures of those types written by versions of libpcap that map DLT_
78 * values to LINKTYPE_ values can still be read by older versions
79 * of libpcap.
80 *
81 * The other LINKTYPE_* codes are given values starting at 100, in the
82 * hopes that no DLT_* code will be given one of those values.
83 *
84 * In order to ensure that a given LINKTYPE_* code's value will refer to
85 * the same encapsulation type on all platforms, you should not allocate
86 * a new LINKTYPE_* value without consulting
87 * "tcpdump-workers@lists.tcpdump.org". The tcpdump developers will
88 * allocate a value for you, and will not subsequently allocate it to
89 * anybody else; that value will be added to the "pcap.h" in the
90 * tcpdump.org Git repository, so that a future libpcap release will
91 * include it.
92 *
93 * You should, if possible, also contribute patches to libpcap and tcpdump
94 * to handle the new encapsulation type, so that they can also be checked
95 * into the tcpdump.org Git repository and so that they will appear in
96 * future libpcap and tcpdump releases.
97 *
98 * Do *NOT* assume that any values after the largest value in this file
99 * are available; you might not have the most up-to-date version of this
100 * file, and new values after that one might have been assigned. Also,
101 * do *NOT* use any values below 100 - those might already have been
102 * taken by one (or more!) organizations.
103 *
104 * Any platform that defines additional DLT_* codes should:
105 *
106 * request a LINKTYPE_* code and value from tcpdump.org,
107 * as per the above;
108 *
109 * add, in their version of libpcap, an entry to map
110 * those DLT_* codes to the corresponding LINKTYPE_*
111 * code;
112 *
113 * redefine, in their "net/bpf.h", any DLT_* values
114 * that collide with the values used by their additional
115 * DLT_* codes, to remove those collisions (but without
116 * making them collide with any of the LINKTYPE_*
117 * values equal to 50 or above; they should also avoid
118 * defining DLT_* values that collide with those
119 * LINKTYPE_* values, either).
120 */
121 #define LINKTYPE_NULL DLT_NULL
122 #define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */
123 #define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */
124 #define LINKTYPE_AX25 DLT_AX25
125 #define LINKTYPE_PRONET DLT_PRONET
126 #define LINKTYPE_CHAOS DLT_CHAOS
127 #define LINKTYPE_IEEE802_5 DLT_IEEE802 /* DLT_IEEE802 is used for 802.5 Token Ring */
128 #define LINKTYPE_ARCNET_BSD DLT_ARCNET /* BSD-style headers */
129 #define LINKTYPE_SLIP DLT_SLIP
130 #define LINKTYPE_PPP DLT_PPP
131 #define LINKTYPE_FDDI DLT_FDDI
132
133 /*
134 * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662
135 * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol
136 * field) at the beginning of the packet.
137 *
138 * This is for use when there is always such a header; the address field
139 * might be 0xff, for regular PPP, or it might be an address field for Cisco
140 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco
141 * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL.
142 *
143 * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that
144 * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL
145 * captures will be written out with a link type that NetBSD's tcpdump
146 * can read.
147 */
148 #define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */
149
150 #define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */
151
152 #define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */
153
154 /*
155 * These correspond to DLT_s that have different values on different
156 * platforms; we map between these values in capture files and
157 * the DLT_ values as returned by pcap_datalink() and passed to
158 * pcap_open_dead().
159 */
160 #define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */
161 #define LINKTYPE_RAW 101 /* raw IP */
162 #define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */
163 #define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */
164
165 /*
166 * Values starting with 104 are used for newly-assigned link-layer
167 * header type values; for those link-layer header types, the DLT_
168 * value returned by pcap_datalink() and passed to pcap_open_dead(),
169 * and the LINKTYPE_ value that appears in capture files, are the
170 * same.
171 *
172 * LINKTYPE_MATCHING_MIN is the lowest such value; LINKTYPE_MATCHING_MAX
173 * is the highest such value.
174 */
175 #define LINKTYPE_MATCHING_MIN 104 /* lowest value in the "matching" range */
176
177 #define LINKTYPE_C_HDLC 104 /* Cisco HDLC */
178 #define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */
179 #define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */
180 #define LINKTYPE_FRELAY 107 /* Frame Relay */
181 #define LINKTYPE_LOOP 108 /* OpenBSD loopback */
182 #define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */
183
184 /*
185 * These three types are reserved for future use.
186 */
187 #define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */
188 #define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */
189 #define LINKTYPE_HDLC 112 /* NetBSD HDLC framing */
190
191 #define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */
192 #define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */
193 #define LINKTYPE_ECONET 115 /* Acorn Econet */
194
195 /*
196 * Reserved for use with OpenBSD ipfilter.
197 */
198 #define LINKTYPE_IPFILTER 116
199
200 #define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */
201 #define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */
202 #define LINKTYPE_IEEE802_11_PRISM 119 /* 802.11 plus Prism II monitor mode radio metadata header */
203 #define LINKTYPE_IEEE802_11_AIRONET 120 /* 802.11 plus FreeBSD Aironet driver radio metadata header */
204
205 /*
206 * Reserved for Siemens HiPath HDLC.
207 */
208 #define LINKTYPE_HHDLC 121
209
210 #define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */
211 #define LINKTYPE_SUNATM 123 /* Solaris+SunATM */
212
213 /*
214 * Reserved as per request from Kent Dahlgren <kent@praesum.com>
215 * for private use.
216 */
217 #define LINKTYPE_RIO 124 /* RapidIO */
218 #define LINKTYPE_PCI_EXP 125 /* PCI Express */
219 #define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */
220
221 #define LINKTYPE_IEEE802_11_RADIOTAP 127 /* 802.11 plus radiotap radio metadata header */
222
223 /*
224 * Reserved for the TZSP encapsulation, as per request from
225 * Chris Waters <chris.waters@networkchemistry.com>
226 * TZSP is a generic encapsulation for any other link type,
227 * which includes a means to include meta-information
228 * with the packet, e.g. signal strength and channel
229 * for 802.11 packets.
230 */
231 #define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */
232
233 #define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */
234
235 /*
236 * Juniper-private data link types, as per request from
237 * Hannes Gredler <hannes@juniper.net>. The corresponding
238 * DLT_s are used for passing on chassis-internal
239 * metainformation such as QOS profiles, etc..
240 */
241 #define LINKTYPE_JUNIPER_MLPPP 130
242 #define LINKTYPE_JUNIPER_MLFR 131
243 #define LINKTYPE_JUNIPER_ES 132
244 #define LINKTYPE_JUNIPER_GGSN 133
245 #define LINKTYPE_JUNIPER_MFR 134
246 #define LINKTYPE_JUNIPER_ATM2 135
247 #define LINKTYPE_JUNIPER_SERVICES 136
248 #define LINKTYPE_JUNIPER_ATM1 137
249
250 #define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */
251
252 #define LINKTYPE_MTP2_WITH_PHDR 139
253 #define LINKTYPE_MTP2 140
254 #define LINKTYPE_MTP3 141
255 #define LINKTYPE_SCCP 142
256
257 #define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */
258
259 #define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */
260
261 /*
262 * Reserved for IBM SP switch and IBM Next Federation switch.
263 */
264 #define LINKTYPE_IBM_SP 145
265 #define LINKTYPE_IBM_SN 146
266
267 /*
268 * Reserved for private use. If you have some link-layer header type
269 * that you want to use within your organization, with the capture files
270 * using that link-layer header type not ever be sent outside your
271 * organization, you can use these values.
272 *
273 * No libpcap release will use these for any purpose, nor will any
274 * tcpdump release use them, either.
275 *
276 * Do *NOT* use these in capture files that you expect anybody not using
277 * your private versions of capture-file-reading tools to read; in
278 * particular, do *NOT* use them in products, otherwise you may find that
279 * people won't be able to use tcpdump, or snort, or Ethereal, or... to
280 * read capture files from your firewall/intrusion detection/traffic
281 * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value,
282 * and you may also find that the developers of those applications will
283 * not accept patches to let them read those files.
284 *
285 * Also, do not use them if somebody might send you a capture using them
286 * for *their* private type and tools using them for *your* private type
287 * would have to read them.
288 *
289 * Instead, in those cases, ask "tcpdump-workers@lists.tcpdump.org" for a
290 * new DLT_ and LINKTYPE_ value, as per the comment in pcap/bpf.h, and use
291 * the type you're given.
292 */
293 #define LINKTYPE_USER0 147
294 #define LINKTYPE_USER1 148
295 #define LINKTYPE_USER2 149
296 #define LINKTYPE_USER3 150
297 #define LINKTYPE_USER4 151
298 #define LINKTYPE_USER5 152
299 #define LINKTYPE_USER6 153
300 #define LINKTYPE_USER7 154
301 #define LINKTYPE_USER8 155
302 #define LINKTYPE_USER9 156
303 #define LINKTYPE_USER10 157
304 #define LINKTYPE_USER11 158
305 #define LINKTYPE_USER12 159
306 #define LINKTYPE_USER13 160
307 #define LINKTYPE_USER14 161
308 #define LINKTYPE_USER15 162
309
310 /*
311 * For future use with 802.11 captures - defined by AbsoluteValue
312 * Systems to store a number of bits of link-layer information
313 * including radio information:
314 *
315 * http://www.shaftnet.org/~pizza/software/capturefrm.txt
316 */
317 #define LINKTYPE_IEEE802_11_AVS 163 /* 802.11 plus AVS radio metadata header */
318
319 /*
320 * Juniper-private data link type, as per request from
321 * Hannes Gredler <hannes@juniper.net>. The corresponding
322 * DLT_s are used for passing on chassis-internal
323 * metainformation such as QOS profiles, etc..
324 */
325 #define LINKTYPE_JUNIPER_MONITOR 164
326
327 /*
328 * BACnet MS/TP frames.
329 */
330 #define LINKTYPE_BACNET_MS_TP 165
331
332 /*
333 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>.
334 *
335 * This is used in some OSes to allow a kernel socket filter to distinguish
336 * between incoming and outgoing packets, on a socket intended to
337 * supply pppd with outgoing packets so it can do dial-on-demand and
338 * hangup-on-lack-of-demand; incoming packets are filtered out so they
339 * don't cause pppd to hold the connection up (you don't want random
340 * input packets such as port scans, packets from old lost connections,
341 * etc. to force the connection to stay up).
342 *
343 * The first byte of the PPP header (0xff03) is modified to accomodate
344 * the direction - 0x00 = IN, 0x01 = OUT.
345 */
346 #define LINKTYPE_PPP_PPPD 166
347
348 /*
349 * Juniper-private data link type, as per request from
350 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used
351 * for passing on chassis-internal metainformation such as
352 * QOS profiles, cookies, etc..
353 */
354 #define LINKTYPE_JUNIPER_PPPOE 167
355 #define LINKTYPE_JUNIPER_PPPOE_ATM 168
356
357 #define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */
358 #define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */
359 #define LINKTYPE_GPF_F 171 /* GPF-T (ITU-T G.7041/Y.1303) */
360
361 /*
362 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line
363 * monitoring equipment.
364 */
365 #define LINKTYPE_GCOM_T1E1 172
366 #define LINKTYPE_GCOM_SERIAL 173
367
368 /*
369 * Juniper-private data link type, as per request from
370 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used
371 * for internal communication to Physical Interface Cards (PIC)
372 */
373 #define LINKTYPE_JUNIPER_PIC_PEER 174
374
375 /*
376 * Link types requested by Gregor Maier <gregor@endace.com> of Endace
377 * Measurement Systems. They add an ERF header (see
378 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of
379 * the link-layer header.
380 */
381 #define LINKTYPE_ERF_ETH 175 /* Ethernet */
382 #define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */
383
384 /*
385 * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD
386 * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header
387 * includes additional information before the LAPD header, so it's
388 * not necessarily a generic LAPD header.
389 */
390 #define LINKTYPE_LINUX_LAPD 177
391
392 /*
393 * Juniper-private data link type, as per request from
394 * Hannes Gredler <hannes@juniper.net>.
395 * The Link Types are used for prepending meta-information
396 * like interface index, interface name
397 * before standard Ethernet, PPP, Frelay & C-HDLC Frames
398 */
399 #define LINKTYPE_JUNIPER_ETHER 178
400 #define LINKTYPE_JUNIPER_PPP 179
401 #define LINKTYPE_JUNIPER_FRELAY 180
402 #define LINKTYPE_JUNIPER_CHDLC 181
403
404 /*
405 * Multi Link Frame Relay (FRF.16)
406 */
407 #define LINKTYPE_MFR 182
408
409 /*
410 * Juniper-private data link type, as per request from
411 * Hannes Gredler <hannes@juniper.net>.
412 * The DLT_ is used for internal communication with a
413 * voice Adapter Card (PIC)
414 */
415 #define LINKTYPE_JUNIPER_VP 183
416
417 /*
418 * Arinc 429 frames.
419 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
420 * Every frame contains a 32bit A429 label.
421 * More documentation on Arinc 429 can be found at
422 * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf
423 */
424 #define LINKTYPE_A429 184
425
426 /*
427 * Arinc 653 Interpartition Communication messages.
428 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
429 * Please refer to the A653-1 standard for more information.
430 */
431 #define LINKTYPE_A653_ICM 185
432
433 /*
434 * USB packets, beginning with a USB setup header; requested by
435 * Paolo Abeni <paolo.abeni@email.it>.
436 */
437 #define LINKTYPE_USB 186
438
439 /*
440 * Bluetooth HCI UART transport layer (part H:4); requested by
441 * Paolo Abeni.
442 */
443 #define LINKTYPE_BLUETOOTH_HCI_H4 187
444
445 /*
446 * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz
447 * <cruz_petagay@bah.com>.
448 */
449 #define LINKTYPE_IEEE802_16_MAC_CPS 188
450
451 /*
452 * USB packets, beginning with a Linux USB header; requested by
453 * Paolo Abeni <paolo.abeni@email.it>.
454 */
455 #define LINKTYPE_USB_LINUX 189
456
457 /*
458 * Controller Area Network (CAN) v. 2.0B packets.
459 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
460 * Used to dump CAN packets coming from a CAN Vector board.
461 * More documentation on the CAN v2.0B frames can be found at
462 * http://www.can-cia.org/downloads/?269
463 */
464 #define LINKTYPE_CAN20B 190
465
466 /*
467 * IEEE 802.15.4, with address fields padded, as is done by Linux
468 * drivers; requested by Juergen Schimmer.
469 */
470 #define LINKTYPE_IEEE802_15_4_LINUX 191
471
472 /*
473 * Per Packet Information encapsulated packets.
474 * LINKTYPE_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
475 */
476 #define LINKTYPE_PPI 192
477
478 /*
479 * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header;
480 * requested by Charles Clancy.
481 */
482 #define LINKTYPE_IEEE802_16_MAC_CPS_RADIO 193
483
484 /*
485 * Juniper-private data link type, as per request from
486 * Hannes Gredler <hannes@juniper.net>.
487 * The DLT_ is used for internal communication with a
488 * integrated service module (ISM).
489 */
490 #define LINKTYPE_JUNIPER_ISM 194
491
492 /*
493 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
494 * nothing); requested by Mikko Saarnivala <mikko.saarnivala@sensinode.com>.
495 */
496 #define LINKTYPE_IEEE802_15_4 195
497
498 /*
499 * Various link-layer types, with a pseudo-header, for SITA
500 * (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com).
501 */
502 #define LINKTYPE_SITA 196
503
504 /*
505 * Various link-layer types, with a pseudo-header, for Endace DAG cards;
506 * encapsulates Endace ERF records. Requested by Stephen Donnelly
507 * <stephen@endace.com>.
508 */
509 #define LINKTYPE_ERF 197
510
511 /*
512 * Special header prepended to Ethernet packets when capturing from a
513 * u10 Networks board. Requested by Phil Mulholland
514 * <phil@u10networks.com>.
515 */
516 #define LINKTYPE_RAIF1 198
517
518 /*
519 * IPMB packet for IPMI, beginning with the I2C slave address, followed
520 * by the netFn and LUN, etc.. Requested by Chanthy Toeung
521 * <chanthy.toeung@ca.kontron.com>.
522 */
523 #define LINKTYPE_IPMB 199
524
525 /*
526 * Juniper-private data link type, as per request from
527 * Hannes Gredler <hannes@juniper.net>.
528 * The DLT_ is used for capturing data on a secure tunnel interface.
529 */
530 #define LINKTYPE_JUNIPER_ST 200
531
532 /*
533 * Bluetooth HCI UART transport layer (part H:4), with pseudo-header
534 * that includes direction information; requested by Paolo Abeni.
535 */
536 #define LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR 201
537
538 /*
539 * AX.25 packet with a 1-byte KISS header; see
540 *
541 * http://www.ax25.net/kiss.htm
542 *
543 * as per Richard Stearn <richard@rns-stearn.demon.co.uk>.
544 */
545 #define LINKTYPE_AX25_KISS 202
546
547 /*
548 * LAPD packets from an ISDN channel, starting with the address field,
549 * with no pseudo-header.
550 * Requested by Varuna De Silva <varunax@gmail.com>.
551 */
552 #define LINKTYPE_LAPD 203
553
554 /*
555 * Variants of various link-layer headers, with a one-byte direction
556 * pseudo-header prepended - zero means "received by this host",
557 * non-zero (any non-zero value) means "sent by this host" - as per
558 * Will Barker <w.barker@zen.co.uk>.
559 */
560 #define LINKTYPE_PPP_WITH_DIR 204 /* PPP */
561 #define LINKTYPE_C_HDLC_WITH_DIR 205 /* Cisco HDLC */
562 #define LINKTYPE_FRELAY_WITH_DIR 206 /* Frame Relay */
563 #define LINKTYPE_LAPB_WITH_DIR 207 /* LAPB */
564
565 /*
566 * 208 is reserved for an as-yet-unspecified proprietary link-layer
567 * type, as requested by Will Barker.
568 */
569
570 /*
571 * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman
572 * <avn@pigeonpoint.com>.
573 */
574 #define LINKTYPE_IPMB_LINUX 209
575
576 /*
577 * FlexRay automotive bus - http://www.flexray.com/ - as requested
578 * by Hannes Kaelber <hannes.kaelber@x2e.de>.
579 */
580 #define LINKTYPE_FLEXRAY 210
581
582 /*
583 * Media Oriented Systems Transport (MOST) bus for multimedia
584 * transport - http://www.mostcooperation.com/ - as requested
585 * by Hannes Kaelber <hannes.kaelber@x2e.de>.
586 */
587 #define LINKTYPE_MOST 211
588
589 /*
590 * Local Interconnect Network (LIN) bus for vehicle networks -
591 * http://www.lin-subbus.org/ - as requested by Hannes Kaelber
592 * <hannes.kaelber@x2e.de>.
593 */
594 #define LINKTYPE_LIN 212
595
596 /*
597 * X2E-private data link type used for serial line capture,
598 * as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
599 */
600 #define LINKTYPE_X2E_SERIAL 213
601
602 /*
603 * X2E-private data link type used for the Xoraya data logger
604 * family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
605 */
606 #define LINKTYPE_X2E_XORAYA 214
607
608 /*
609 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
610 * nothing), but with the PHY-level data for non-ASK PHYs (4 octets
611 * of 0 as preamble, one octet of SFD, one octet of frame length+
612 * reserved bit, and then the MAC-layer data, starting with the
613 * frame control field).
614 *
615 * Requested by Max Filippov <jcmvbkbc@gmail.com>.
616 */
617 #define LINKTYPE_IEEE802_15_4_NONASK_PHY 215
618
619 /*
620 * David Gibson <david@gibson.dropbear.id.au> requested this for
621 * captures from the Linux kernel /dev/input/eventN devices. This
622 * is used to communicate keystrokes and mouse movements from the
623 * Linux kernel to display systems, such as Xorg.
624 */
625 #define LINKTYPE_LINUX_EVDEV 216
626
627 /*
628 * GSM Um and Abis interfaces, preceded by a "gsmtap" header.
629 *
630 * Requested by Harald Welte <laforge@gnumonks.org>.
631 */
632 #define LINKTYPE_GSMTAP_UM 217
633 #define LINKTYPE_GSMTAP_ABIS 218
634
635 /*
636 * MPLS, with an MPLS label as the link-layer header.
637 * Requested by Michele Marchetto <michele@openbsd.org> on behalf
638 * of OpenBSD.
639 */
640 #define LINKTYPE_MPLS 219
641
642 /*
643 * USB packets, beginning with a Linux USB header, with the USB header
644 * padded to 64 bytes; required for memory-mapped access.
645 */
646 #define LINKTYPE_USB_LINUX_MMAPPED 220
647
648 /*
649 * DECT packets, with a pseudo-header; requested by
650 * Matthias Wenzel <tcpdump@mazzoo.de>.
651 */
652 #define LINKTYPE_DECT 221
653
654 /*
655 * From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1@nasa.gov>
656 * Date: Mon, 11 May 2009 11:18:30 -0500
657 *
658 * DLT_AOS. We need it for AOS Space Data Link Protocol.
659 * I have already written dissectors for but need an OK from
660 * legal before I can submit a patch.
661 *
662 */
663 #define LINKTYPE_AOS 222
664
665 /*
666 * Wireless HART (Highway Addressable Remote Transducer)
667 * From the HART Communication Foundation
668 * IES/PAS 62591
669 *
670 * Requested by Sam Roberts <vieuxtech@gmail.com>.
671 */
672 #define LINKTYPE_WIHART 223
673
674 /*
675 * Fibre Channel FC-2 frames, beginning with a Frame_Header.
676 * Requested by Kahou Lei <kahou82@gmail.com>.
677 */
678 #define LINKTYPE_FC_2 224
679
680 /*
681 * Fibre Channel FC-2 frames, beginning with an encoding of the
682 * SOF, and ending with an encoding of the EOF.
683 *
684 * The encodings represent the frame delimiters as 4-byte sequences
685 * representing the corresponding ordered sets, with K28.5
686 * represented as 0xBC, and the D symbols as the corresponding
687 * byte values; for example, SOFi2, which is K28.5 - D21.5 - D1.2 - D21.2,
688 * is represented as 0xBC 0xB5 0x55 0x55.
689 *
690 * Requested by Kahou Lei <kahou82@gmail.com>.
691 */
692 #define LINKTYPE_FC_2_WITH_FRAME_DELIMS 225
693
694 /*
695 * Solaris ipnet pseudo-header; requested by Darren Reed <Darren.Reed@Sun.COM>.
696 *
697 * The pseudo-header starts with a one-byte version number; for version 2,
698 * the pseudo-header is:
699 *
700 * struct dl_ipnetinfo {
701 * u_int8_t dli_version;
702 * u_int8_t dli_family;
703 * u_int16_t dli_htype;
704 * u_int32_t dli_pktlen;
705 * u_int32_t dli_ifindex;
706 * u_int32_t dli_grifindex;
707 * u_int32_t dli_zsrc;
708 * u_int32_t dli_zdst;
709 * };
710 *
711 * dli_version is 2 for the current version of the pseudo-header.
712 *
713 * dli_family is a Solaris address family value, so it's 2 for IPv4
714 * and 26 for IPv6.
715 *
716 * dli_htype is a "hook type" - 0 for incoming packets, 1 for outgoing
717 * packets, and 2 for packets arriving from another zone on the same
718 * machine.
719 *
720 * dli_pktlen is the length of the packet data following the pseudo-header
721 * (so the captured length minus dli_pktlen is the length of the
722 * pseudo-header, assuming the entire pseudo-header was captured).
723 *
724 * dli_ifindex is the interface index of the interface on which the
725 * packet arrived.
726 *
727 * dli_grifindex is the group interface index number (for IPMP interfaces).
728 *
729 * dli_zsrc is the zone identifier for the source of the packet.
730 *
731 * dli_zdst is the zone identifier for the destination of the packet.
732 *
733 * A zone number of 0 is the global zone; a zone number of 0xffffffff
734 * means that the packet arrived from another host on the network, not
735 * from another zone on the same machine.
736 *
737 * An IPv4 or IPv6 datagram follows the pseudo-header; dli_family indicates
738 * which of those it is.
739 */
740 #define LINKTYPE_IPNET 226
741
742 /*
743 * CAN (Controller Area Network) frames, with a pseudo-header as supplied
744 * by Linux SocketCAN. See Documentation/networking/can.txt in the Linux
745 * source.
746 *
747 * Requested by Felix Obenhuber <felix@obenhuber.de>.
748 */
749 #define LINKTYPE_CAN_SOCKETCAN 227
750
751 /*
752 * Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies
753 * whether it's v4 or v6. Requested by Darren Reed <Darren.Reed@Sun.COM>.
754 */
755 #define LINKTYPE_IPV4 228
756 #define LINKTYPE_IPV6 229
757
758 /*
759 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
760 * nothing), and with no FCS at the end of the frame; requested by
761 * Jon Smirl <jonsmirl@gmail.com>.
762 */
763 #define LINKTYPE_IEEE802_15_4_NOFCS 230
764
765 /*
766 * Raw D-Bus:
767 *
768 * http://www.freedesktop.org/wiki/Software/dbus
769 *
770 * messages:
771 *
772 * http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages
773 *
774 * starting with the endianness flag, followed by the message type, etc.,
775 * but without the authentication handshake before the message sequence:
776 *
777 * http://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol
778 *
779 * Requested by Martin Vidner <martin@vidner.net>.
780 */
781 #define LINKTYPE_DBUS 231
782
783 /*
784 * Juniper-private data link type, as per request from
785 * Hannes Gredler <hannes@juniper.net>.
786 */
787 #define LINKTYPE_JUNIPER_VS 232
788 #define LINKTYPE_JUNIPER_SRX_E2E 233
789 #define LINKTYPE_JUNIPER_FIBRECHANNEL 234
790
791 /*
792 * DVB-CI (DVB Common Interface for communication between a PC Card
793 * module and a DVB receiver). See
794 *
795 * http://www.kaiser.cx/pcap-dvbci.html
796 *
797 * for the specification.
798 *
799 * Requested by Martin Kaiser <martin@kaiser.cx>.
800 */
801 #define LINKTYPE_DVB_CI 235
802
803 /*
804 * Variant of 3GPP TS 27.010 multiplexing protocol. Requested
805 * by Hans-Christoph Schemmel <hans-christoph.schemmel@cinterion.com>.
806 */
807 #define LINKTYPE_MUX27010 236
808
809 /*
810 * STANAG 5066 D_PDUs. Requested by M. Baris Demiray
811 * <barisdemiray@gmail.com>.
812 */
813 #define LINKTYPE_STANAG_5066_D_PDU 237
814
815 /*
816 * Juniper-private data link type, as per request from
817 * Hannes Gredler <hannes@juniper.net>.
818 */
819 #define LINKTYPE_JUNIPER_ATM_CEMIC 238
820
821 /*
822 * NetFilter LOG messages
823 * (payload of netlink NFNL_SUBSYS_ULOG/NFULNL_MSG_PACKET packets)
824 *
825 * Requested by Jakub Zawadzki <darkjames-ws@darkjames.pl>
826 */
827 #define LINKTYPE_NFLOG 239
828
829 /*
830 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type
831 * for Ethernet packets with a 4-byte pseudo-header and always
832 * with the payload including the FCS, as supplied by their
833 * netANALYZER hardware and software.
834 *
835 * Requested by Holger P. Frommer <HPfrommer@hilscher.com>
836 */
837 #define LINKTYPE_NETANALYZER 240
838
839 /*
840 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type
841 * for Ethernet packets with a 4-byte pseudo-header and FCS and
842 * 1 byte of SFD, as supplied by their netANALYZER hardware and
843 * software.
844 *
845 * Requested by Holger P. Frommer <HPfrommer@hilscher.com>
846 */
847 #define LINKTYPE_NETANALYZER_TRANSPARENT 241
848
849 /*
850 * IP-over-InfiniBand, as specified by RFC 4391.
851 *
852 * Requested by Petr Sumbera <petr.sumbera@oracle.com>.
853 */
854 #define LINKTYPE_IPOIB 242
855
856 /*
857 * MPEG-2 transport stream (ISO 13818-1/ITU-T H.222.0).
858 *
859 * Requested by Guy Martin <gmsoft@tuxicoman.be>.
860 */
861 #define LINKTYPE_MPEG_2_TS 243
862
863 /*
864 * ng4T GmbH's UMTS Iub/Iur-over-ATM and Iub/Iur-over-IP format as
865 * used by their ng40 protocol tester.
866 *
867 * Requested by Jens Grimmer <jens.grimmer@ng4t.com>.
868 */
869 #define LINKTYPE_NG40 244
870
871 /*
872 * Pseudo-header giving adapter number and flags, followed by an NFC
873 * (Near-Field Communications) Logical Link Control Protocol (LLCP) PDU,
874 * as specified by NFC Forum Logical Link Control Protocol Technical
875 * Specification LLCP 1.1.
876 *
877 * Requested by Mike Wakerly <mikey@google.com>.
878 */
879 #define LINKTYPE_NFC_LLCP 245
880
881 /*
882 * pfsync output; DLT_PFSYNC is 18, which collides with DLT_CIP in
883 * SuSE 6.3, on OpenBSD, NetBSD, DragonFly BSD, and Mac OS X, and
884 * is 121, which collides with DLT_HHDLC, in FreeBSD. We pick a
885 * shiny new link-layer header type value that doesn't collide with
886 * anything, in the hopes that future pfsync savefiles, if any,
887 * won't require special hacks to distinguish from other savefiles.
888 *
889 */
890 #define LINKTYPE_PFSYNC 246
891
892 /*
893 * Raw InfiniBand packets, starting with the Local Routing Header.
894 *
895 * Requested by Oren Kladnitsky <orenk@mellanox.com>.
896 */
897 #define LINKTYPE_INFINIBAND 247
898
899 /*
900 * SCTP, with no lower-level protocols (i.e., no IPv4 or IPv6).
901 *
902 * Requested by Michael Tuexen <Michael.Tuexen@lurchi.franken.de>.
903 */
904 #define LINKTYPE_SCTP 248
905
906 /*
907 * USB packets, beginning with a USBPcap header.
908 *
909 * Requested by Tomasz Mon <desowin@gmail.com>
910 */
911 #define LINKTYPE_USBPCAP 249
912
913 /*
914 * Schweitzer Engineering Laboratories "RTAC" product serial-line
915 * packets.
916 *
917 * Requested by Chris Bontje <chris_bontje@selinc.com>.
918 */
919 #define DLT_RTAC_SERIAL 250
920
921 /*
922 * Bluetooth Low Energy air interface link-layer packets.
923 *
924 * Requested by Mike Kershaw <dragorn@kismetwireless.net>.
925 */
926 #define LINKTYPE_BLUETOOTH_LE_LL 251
927
928 /*
929 * Link-layer header type for upper-protocol layer PDU saves from wireshark.
930 *
931 * the actual contents are determined by two TAGs stored with each
932 * packet:
933 * EXP_PDU_TAG_LINKTYPE the link type (LINKTYPE_ value) of the
934 * original packet.
935 *
936 * EXP_PDU_TAG_PROTO_NAME the name of the wireshark dissector
937 * that can make sense of the data stored.
938 */
939 #define LINKTYPE_WIRESHARK_UPPER_PDU 252
940
941 /*
942 * Link-layer header type for the netlink protocol (nlmon devices).
943 */
944 #define LINKTYPE_NETLINK 253
945
946 /*
947 * Bluetooth Linux Monitor headers for the BlueZ stack.
948 */
949 #define LINKTYPE_BLUETOOTH_LINUX_MONITOR 254
950
951 /*
952 * Bluetooth Basic Rate/Enhanced Data Rate baseband packets, as
953 * captured by Ubertooth.
954 */
955 #define LINKTYPE_BLUETOOTH_BREDR_BB 255
956
957 /*
958 * Bluetooth Low Energy link layer packets, as captured by Ubertooth.
959 */
960 #define LINKTYPE_BLUETOOTH_LE_LL_WITH_PHDR 256
961
962 /*
963 * PROFIBUS data link layer.
964 */
965 #define LINKTYPE_PROFIBUS_DL 257
966
967
968 /*
969 * Apple's DLT_PKTAP headers.
970 *
971 * Sadly, the folks at Apple either had no clue that the DLT_USERn values
972 * are for internal use within an organization and partners only, and
973 * didn't know that the right way to get a link-layer header type is to
974 * ask tcpdump.org for one, or knew and didn't care, so they just
975 * used DLT_USER2, which causes problems for everything except for
976 * their version of tcpdump.
977 *
978 * So I'll just give them one; hopefully this will show up in a
979 * libpcap release in time for them to get this into 10.10 Big Sur
980 * or whatever Mavericks' successor is called. LINKTYPE_PKTAP
981 * will be 258 *even on OS X*; that is *intentional*, so that
982 * PKTAP files look the same on *all* OSes (different OSes can have
983 * different numerical values for a given DLT_, but *MUST NOT* have
984 * different values for what goes in a file, as files can be moved
985 * between OSes!).
986 */
987 #define LINKTYPE_PKTAP 258
988
989 /*
990 * Ethernet packets preceded by a header giving the last 6 octets
991 * of the preamble specified by 802.3-2012 Clause 65, section
992 * 65.1.3.2 "Transmit".
993 */
994 #define LINKTYPE_EPON 259
995
996 /*
997 * IPMI trace packets, as specified by Table 3-20 "Trace Data Block Format"
998 * in the PICMG HPM.2 specification.
999 */
1000 #define LINKTYPE_IPMI_HPM_2 260
1001
1002 /*
1003 * per Joshua Wright <jwright@hasborg.com>, formats for Zwave captures.
1004 */
1005 #define LINKTYPE_ZWAVE_R1_R2 261
1006 #define LINKTYPE_ZWAVE_R3 262
1007
1008 #define LINKTYPE_MATCHING_MAX 262 /* highest value in the "matching" range */
1009
1010 static struct linktype_map {
1011 int dlt;
1012 int linktype;
1013 } map[] = {
1014 /*
1015 * These DLT_* codes have LINKTYPE_* codes with values identical
1016 * to the values of the corresponding DLT_* code.
1017 */
1018 { DLT_NULL, LINKTYPE_NULL },
1019 { DLT_EN10MB, LINKTYPE_ETHERNET },
1020 { DLT_EN3MB, LINKTYPE_EXP_ETHERNET },
1021 { DLT_AX25, LINKTYPE_AX25 },
1022 { DLT_PRONET, LINKTYPE_PRONET },
1023 { DLT_CHAOS, LINKTYPE_CHAOS },
1024 { DLT_IEEE802, LINKTYPE_IEEE802_5 },
1025 { DLT_ARCNET, LINKTYPE_ARCNET_BSD },
1026 { DLT_SLIP, LINKTYPE_SLIP },
1027 { DLT_PPP, LINKTYPE_PPP },
1028 { DLT_FDDI, LINKTYPE_FDDI },
1029 { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL },
1030
1031 /*
1032 * These DLT_* codes have different values on different
1033 * platforms; we map them to LINKTYPE_* codes that
1034 * have values that should never be equal to any DLT_*
1035 * code.
1036 */
1037 #ifdef DLT_FR
1038 /* BSD/OS Frame Relay */
1039 { DLT_FR, LINKTYPE_FRELAY },
1040 #endif
1041
1042 { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 },
1043 { DLT_RAW, LINKTYPE_RAW },
1044 { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS },
1045 { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS },
1046
1047 /* BSD/OS Cisco HDLC */
1048 { DLT_C_HDLC, LINKTYPE_C_HDLC },
1049
1050 /*
1051 * These DLT_* codes are not on all platforms, but, so far,
1052 * there don't appear to be any platforms that define
1053 * other codes with those values; we map them to
1054 * different LINKTYPE_* values anyway, just in case.
1055 */
1056
1057 /* Linux ATM Classical IP */
1058 { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP },
1059
1060 /* NetBSD sync/async serial PPP (or Cisco HDLC) */
1061 { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC },
1062
1063 /* NetBSD PPP over Ethernet */
1064 { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER },
1065
1066 /*
1067 * All LINKTYPE_ values between LINKTYPE_MATCHING_MIN
1068 * and LINKTYPE_MATCHING_MAX are mapped to identical
1069 * DLT_ values.
1070 */
1071
1072 { -1, -1 }
1073 };
1074
1075 int
dlt_to_linktype(int dlt)1076 dlt_to_linktype(int dlt)
1077 {
1078 int i;
1079
1080 /*
1081 * DLTs that, on some platforms, have values in the matching range
1082 * but that *don't* have the same value as the corresponding
1083 * LINKTYPE because, for some reason, not all OSes have the
1084 * same value for that DLT (note that the DLT's value might be
1085 * outside the matching range on some of those OSes).
1086 */
1087 if (dlt == DLT_PFSYNC)
1088 return (LINKTYPE_PFSYNC);
1089 if (dlt == DLT_PKTAP)
1090 return (LINKTYPE_PKTAP);
1091
1092 /*
1093 * For all other values in the matching range, the DLT
1094 * value is the same as the LINKTYPE value.
1095 */
1096 if (dlt >= DLT_MATCHING_MIN && dlt <= DLT_MATCHING_MAX)
1097 return (dlt);
1098
1099 /*
1100 * Map the values outside that range.
1101 */
1102 for (i = 0; map[i].dlt != -1; i++) {
1103 if (map[i].dlt == dlt)
1104 return (map[i].linktype);
1105 }
1106
1107 /*
1108 * If we don't have a mapping for this DLT, return an
1109 * error; that means that this is a value with no corresponding
1110 * LINKTYPE, and we need to assign one.
1111 */
1112 return (-1);
1113 }
1114
1115 int
linktype_to_dlt(int linktype)1116 linktype_to_dlt(int linktype)
1117 {
1118 int i;
1119
1120 /*
1121 * LINKTYPEs in the matching range that *don't*
1122 * have the same value as the corresponding DLTs
1123 * because, for some reason, not all OSes have the
1124 * same value for that DLT.
1125 */
1126 if (linktype == LINKTYPE_PFSYNC)
1127 return (DLT_PFSYNC);
1128 if (linktype == LINKTYPE_PKTAP)
1129 return (DLT_PKTAP);
1130
1131 /*
1132 * For all other values in the matching range, the LINKTYPE
1133 * value is the same as the DLT value.
1134 */
1135 if (linktype >= LINKTYPE_MATCHING_MIN &&
1136 linktype <= LINKTYPE_MATCHING_MAX)
1137 return (linktype);
1138
1139 /*
1140 * Map the values outside that range.
1141 */
1142 for (i = 0; map[i].linktype != -1; i++) {
1143 if (map[i].linktype == linktype)
1144 return (map[i].dlt);
1145 }
1146
1147 /*
1148 * If we don't have an entry for this LINKTYPE, return
1149 * the link type value; it may be a DLT from an older
1150 * version of libpcap.
1151 */
1152 return linktype;
1153 }
1154
1155 /*
1156 * The DLT_USB_LINUX and DLT_USB_LINUX_MMAPPED headers are in host
1157 * byte order when capturing (it's supplied directly from a
1158 * memory-mapped buffer shared by the kernel).
1159 *
1160 * When reading a DLT_USB_LINUX or DLT_USB_LINUX_MMAPPED capture file,
1161 * we need to convert it from the byte order of the host that wrote
1162 * the file to this host's byte order.
1163 */
1164 static void
swap_linux_usb_header(const struct pcap_pkthdr * hdr,u_char * buf,int header_len_64_bytes)1165 swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf,
1166 int header_len_64_bytes)
1167 {
1168 pcap_usb_header_mmapped *uhdr = (pcap_usb_header_mmapped *)buf;
1169 bpf_u_int32 offset = 0;
1170
1171 /*
1172 * "offset" is the offset *past* the field we're swapping;
1173 * we skip the field *before* checking to make sure
1174 * the captured data length includes the entire field.
1175 */
1176
1177 /*
1178 * The URB id is a totally opaque value; do we really need to
1179 * convert it to the reading host's byte order???
1180 */
1181 offset += 8; /* skip past id */
1182 if (hdr->caplen < offset)
1183 return;
1184 uhdr->id = SWAPLL(uhdr->id);
1185
1186 offset += 4; /* skip past various 1-byte fields */
1187
1188 offset += 2; /* skip past bus_id */
1189 if (hdr->caplen < offset)
1190 return;
1191 uhdr->bus_id = SWAPSHORT(uhdr->bus_id);
1192
1193 offset += 2; /* skip past various 1-byte fields */
1194
1195 offset += 8; /* skip past ts_sec */
1196 if (hdr->caplen < offset)
1197 return;
1198 uhdr->ts_sec = SWAPLL(uhdr->ts_sec);
1199
1200 offset += 4; /* skip past ts_usec */
1201 if (hdr->caplen < offset)
1202 return;
1203 uhdr->ts_usec = SWAPLONG(uhdr->ts_usec);
1204
1205 offset += 4; /* skip past status */
1206 if (hdr->caplen < offset)
1207 return;
1208 uhdr->status = SWAPLONG(uhdr->status);
1209
1210 offset += 4; /* skip past urb_len */
1211 if (hdr->caplen < offset)
1212 return;
1213 uhdr->urb_len = SWAPLONG(uhdr->urb_len);
1214
1215 offset += 4; /* skip past data_len */
1216 if (hdr->caplen < offset)
1217 return;
1218 uhdr->data_len = SWAPLONG(uhdr->data_len);
1219
1220 if (uhdr->transfer_type == URB_ISOCHRONOUS) {
1221 offset += 4; /* skip past s.iso.error_count */
1222 if (hdr->caplen < offset)
1223 return;
1224 uhdr->s.iso.error_count = SWAPLONG(uhdr->s.iso.error_count);
1225
1226 offset += 4; /* skip past s.iso.numdesc */
1227 if (hdr->caplen < offset)
1228 return;
1229 uhdr->s.iso.numdesc = SWAPLONG(uhdr->s.iso.numdesc);
1230 } else
1231 offset += 8; /* skip USB setup header */
1232
1233 /*
1234 * With the old header, there are no isochronous descriptors
1235 * after the header.
1236 *
1237 * With the new header, the actual number of descriptors in
1238 * the header is not s.iso.numdesc, it's ndesc - only the
1239 * first N descriptors, for some value of N, are put into
1240 * the header, and ndesc is set to the actual number copied.
1241 * In addition, if s.iso.numdesc is negative, no descriptors
1242 * are captured, and ndesc is set to 0.
1243 */
1244 if (header_len_64_bytes) {
1245 /*
1246 * This is either the "version 1" header, with
1247 * 16 bytes of additional fields at the end, or
1248 * a "version 0" header from a memory-mapped
1249 * capture, with 16 bytes of zeroed-out padding
1250 * at the end. Byte swap them as if this were
1251 * a "version 1" header.
1252 */
1253 offset += 4; /* skip past interval */
1254 if (hdr->caplen < offset)
1255 return;
1256 uhdr->interval = SWAPLONG(uhdr->interval);
1257
1258 offset += 4; /* skip past start_frame */
1259 if (hdr->caplen < offset)
1260 return;
1261 uhdr->start_frame = SWAPLONG(uhdr->start_frame);
1262
1263 offset += 4; /* skip past xfer_flags */
1264 if (hdr->caplen < offset)
1265 return;
1266 uhdr->xfer_flags = SWAPLONG(uhdr->xfer_flags);
1267
1268 offset += 4; /* skip past ndesc */
1269 if (hdr->caplen < offset)
1270 return;
1271 uhdr->ndesc = SWAPLONG(uhdr->ndesc);
1272
1273 if (uhdr->transfer_type == URB_ISOCHRONOUS) {
1274 /* swap the values in struct linux_usb_isodesc */
1275 usb_isodesc *pisodesc;
1276 u_int32_t i;
1277
1278 pisodesc = (usb_isodesc *)(void *)(buf+offset);
1279 for (i = 0; i < uhdr->ndesc; i++) {
1280 offset += 4; /* skip past status */
1281 if (hdr->caplen < offset)
1282 return;
1283 pisodesc->status = SWAPLONG(pisodesc->status);
1284
1285 offset += 4; /* skip past offset */
1286 if (hdr->caplen < offset)
1287 return;
1288 pisodesc->offset = SWAPLONG(pisodesc->offset);
1289
1290 offset += 4; /* skip past len */
1291 if (hdr->caplen < offset)
1292 return;
1293 pisodesc->len = SWAPLONG(pisodesc->len);
1294
1295 offset += 4; /* skip past padding */
1296
1297 pisodesc++;
1298 }
1299 }
1300 }
1301 }
1302
1303 /*
1304 * The DLT_NFLOG "packets" have a mixture of big-endian and host-byte-order
1305 * data. They begin with a fixed-length header with big-endian fields,
1306 * followed by a set of TLVs, where the type and length are in host
1307 * byte order but the values are either big-endian or are a raw byte
1308 * sequence that's the same regardless of the host's byte order.
1309 *
1310 * When reading a DLT_NFLOG capture file, we need to convert the type
1311 * and length values from the byte order of the host that wrote the
1312 * file to the byte order of this host.
1313 */
1314 static void
swap_nflog_header(const struct pcap_pkthdr * hdr,u_char * buf)1315 swap_nflog_header(const struct pcap_pkthdr *hdr, u_char *buf)
1316 {
1317 u_char *p = buf;
1318 nflog_hdr_t *nfhdr = (nflog_hdr_t *)buf;
1319 nflog_tlv_t *tlv;
1320 u_int caplen = hdr->caplen;
1321 u_int length = hdr->len;
1322 u_int16_t size;
1323
1324 if (caplen < (int) sizeof(nflog_hdr_t) || length < (int) sizeof(nflog_hdr_t)) {
1325 /* Not enough data to have any TLVs. */
1326 return;
1327 }
1328
1329 if (nfhdr->nflog_version != 0) {
1330 /* Unknown NFLOG version */
1331 return;
1332 }
1333
1334 length -= sizeof(nflog_hdr_t);
1335 caplen -= sizeof(nflog_hdr_t);
1336 p += sizeof(nflog_hdr_t);
1337
1338 while (caplen >= sizeof(nflog_tlv_t)) {
1339 tlv = (nflog_tlv_t *) p;
1340
1341 /* Swap the type and length. */
1342 tlv->tlv_type = SWAPSHORT(tlv->tlv_type);
1343 tlv->tlv_length = SWAPSHORT(tlv->tlv_length);
1344
1345 /* Get the length of the TLV. */
1346 size = tlv->tlv_length;
1347 if (size % 4 != 0)
1348 size += 4 - size % 4;
1349
1350 /* Is the TLV's length less than the minimum? */
1351 if (size < sizeof(nflog_tlv_t)) {
1352 /* Yes. Give up now. */
1353 return;
1354 }
1355
1356 /* Do we have enough data for the full TLV? */
1357 if (caplen < size || length < size) {
1358 /* No. */
1359 return;
1360 }
1361
1362 /* Skip over the TLV. */
1363 length -= size;
1364 caplen -= size;
1365 p += size;
1366 }
1367 }
1368
1369 void
swap_pseudo_headers(int linktype,struct pcap_pkthdr * hdr,u_char * data)1370 swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr, u_char *data)
1371 {
1372 /*
1373 * Convert pseudo-headers from the byte order of
1374 * the host on which the file was saved to our
1375 * byte order, as necessary.
1376 */
1377 switch (linktype) {
1378
1379 case DLT_USB_LINUX:
1380 swap_linux_usb_header(hdr, data, 0);
1381 break;
1382
1383 case DLT_USB_LINUX_MMAPPED:
1384 swap_linux_usb_header(hdr, data, 1);
1385 break;
1386
1387 case DLT_NFLOG:
1388 swap_nflog_header(hdr, data);
1389 break;
1390 }
1391 }
1392