1 /*
2 * Copyright (c) 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 * pcap-common.c - common code for pcap and pcap-ng files
22 */
23
24 #ifdef HAVE_CONFIG_H
25 #include "config.h"
26 #endif
27
28 #ifdef WIN32
29 #include <pcap-stdinc.h>
30 #else /* WIN32 */
31 #if HAVE_INTTYPES_H
32 #include <inttypes.h>
33 #elif HAVE_STDINT_H
34 #include <stdint.h>
35 #endif
36 #ifdef HAVE_SYS_BITYPES_H
37 #include <sys/bitypes.h>
38 #endif
39 #include <sys/types.h>
40 #endif /* WIN32 */
41
42 #include "pcap-int.h"
43 #include "pcap/usb.h"
44 #include "pcap/nflog.h"
45
46 #include "pcap-common.h"
47
48 /*
49 * We don't write DLT_* values to capture files, because they're not the
50 * same on all platforms.
51 *
52 * Unfortunately, the various flavors of BSD have not always used the same
53 * numerical values for the same data types, and various patches to
54 * libpcap for non-BSD OSes have added their own DLT_* codes for link
55 * layer encapsulation types seen on those OSes, and those codes have had,
56 * in some cases, values that were also used, on other platforms, for other
57 * link layer encapsulation types.
58 *
59 * This means that capture files of a type whose numerical DLT_* code
60 * means different things on different BSDs, or with different versions
61 * of libpcap, can't always be read on systems other than those like
62 * the one running on the machine on which the capture was made.
63 *
64 * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes
65 * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_*
66 * codes to DLT_* codes when reading a savefile header.
67 *
68 * For those DLT_* codes that have, as far as we know, the same values on
69 * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as
70 * DLT_xxx; that way, captures of those types can still be read by
71 * versions of libpcap that map LINKTYPE_* values to DLT_* values, and
72 * captures of those types written by versions of libpcap that map DLT_
73 * values to LINKTYPE_ values can still be read by older versions
74 * of libpcap.
75 *
76 * The other LINKTYPE_* codes are given values starting at 100, in the
77 * hopes that no DLT_* code will be given one of those values.
78 *
79 * In order to ensure that a given LINKTYPE_* code's value will refer to
80 * the same encapsulation type on all platforms, you should not allocate
81 * a new LINKTYPE_* value without consulting
82 * "tcpdump-workers@lists.tcpdump.org". The tcpdump developers will
83 * allocate a value for you, and will not subsequently allocate it to
84 * anybody else; that value will be added to the "pcap.h" in the
85 * tcpdump.org Git repository, so that a future libpcap release will
86 * include it.
87 *
88 * You should, if possible, also contribute patches to libpcap and tcpdump
89 * to handle the new encapsulation type, so that they can also be checked
90 * into the tcpdump.org Git repository and so that they will appear in
91 * future libpcap and tcpdump releases.
92 *
93 * Do *NOT* assume that any values after the largest value in this file
94 * are available; you might not have the most up-to-date version of this
95 * file, and new values after that one might have been assigned. Also,
96 * do *NOT* use any values below 100 - those might already have been
97 * taken by one (or more!) organizations.
98 *
99 * Any platform that defines additional DLT_* codes should:
100 *
101 * request a LINKTYPE_* code and value from tcpdump.org,
102 * as per the above;
103 *
104 * add, in their version of libpcap, an entry to map
105 * those DLT_* codes to the corresponding LINKTYPE_*
106 * code;
107 *
108 * redefine, in their "net/bpf.h", any DLT_* values
109 * that collide with the values used by their additional
110 * DLT_* codes, to remove those collisions (but without
111 * making them collide with any of the LINKTYPE_*
112 * values equal to 50 or above; they should also avoid
113 * defining DLT_* values that collide with those
114 * LINKTYPE_* values, either).
115 */
116 #define LINKTYPE_NULL DLT_NULL
117 #define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */
118 #define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */
119 #define LINKTYPE_AX25 DLT_AX25
120 #define LINKTYPE_PRONET DLT_PRONET
121 #define LINKTYPE_CHAOS DLT_CHAOS
122 #define LINKTYPE_IEEE802_5 DLT_IEEE802 /* DLT_IEEE802 is used for 802.5 Token Ring */
123 #define LINKTYPE_ARCNET_BSD DLT_ARCNET /* BSD-style headers */
124 #define LINKTYPE_SLIP DLT_SLIP
125 #define LINKTYPE_PPP DLT_PPP
126 #define LINKTYPE_FDDI DLT_FDDI
127
128 /*
129 * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662
130 * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol
131 * field) at the beginning of the packet.
132 *
133 * This is for use when there is always such a header; the address field
134 * might be 0xff, for regular PPP, or it might be an address field for Cisco
135 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco
136 * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL.
137 *
138 * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that
139 * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL
140 * captures will be written out with a link type that NetBSD's tcpdump
141 * can read.
142 */
143 #define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */
144
145 #define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */
146
147 #define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */
148
149 /*
150 * These correspond to DLT_s that have different values on different
151 * platforms; we map between these values in capture files and
152 * the DLT_ values as returned by pcap_datalink() and passed to
153 * pcap_open_dead().
154 */
155 #define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */
156 #define LINKTYPE_RAW 101 /* raw IP */
157 #define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */
158 #define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */
159
160 /*
161 * Values starting with 104 are used for newly-assigned link-layer
162 * header type values; for those link-layer header types, the DLT_
163 * value returned by pcap_datalink() and passed to pcap_open_dead(),
164 * and the LINKTYPE_ value that appears in capture files, are the
165 * same.
166 *
167 * LINKTYPE_MATCHING_MIN is the lowest such value; LINKTYPE_MATCHING_MAX
168 * is the highest such value.
169 */
170 #define LINKTYPE_MATCHING_MIN 104 /* lowest value in the "matching" range */
171
172 #define LINKTYPE_C_HDLC 104 /* Cisco HDLC */
173 #define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */
174 #define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */
175 #define LINKTYPE_FRELAY 107 /* Frame Relay */
176 #define LINKTYPE_LOOP 108 /* OpenBSD loopback */
177 #define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */
178
179 /*
180 * These three types are reserved for future use.
181 */
182 #define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */
183 #define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */
184 #define LINKTYPE_HDLC 112 /* NetBSD HDLC framing */
185
186 #define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */
187 #define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */
188 #define LINKTYPE_ECONET 115 /* Acorn Econet */
189
190 /*
191 * Reserved for use with OpenBSD ipfilter.
192 */
193 #define LINKTYPE_IPFILTER 116
194
195 #define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */
196 #define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */
197 #define LINKTYPE_IEEE802_11_PRISM 119 /* 802.11 plus Prism II monitor mode radio metadata header */
198 #define LINKTYPE_IEEE802_11_AIRONET 120 /* 802.11 plus FreeBSD Aironet driver radio metadata header */
199
200 /*
201 * Reserved for Siemens HiPath HDLC.
202 */
203 #define LINKTYPE_HHDLC 121
204
205 #define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */
206 #define LINKTYPE_SUNATM 123 /* Solaris+SunATM */
207
208 /*
209 * Reserved as per request from Kent Dahlgren <kent@praesum.com>
210 * for private use.
211 */
212 #define LINKTYPE_RIO 124 /* RapidIO */
213 #define LINKTYPE_PCI_EXP 125 /* PCI Express */
214 #define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */
215
216 #define LINKTYPE_IEEE802_11_RADIOTAP 127 /* 802.11 plus radiotap radio metadata header */
217
218 /*
219 * Reserved for the TZSP encapsulation, as per request from
220 * Chris Waters <chris.waters@networkchemistry.com>
221 * TZSP is a generic encapsulation for any other link type,
222 * which includes a means to include meta-information
223 * with the packet, e.g. signal strength and channel
224 * for 802.11 packets.
225 */
226 #define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */
227
228 #define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */
229
230 /*
231 * Juniper-private data link types, as per request from
232 * Hannes Gredler <hannes@juniper.net>. The corresponding
233 * DLT_s are used for passing on chassis-internal
234 * metainformation such as QOS profiles, etc..
235 */
236 #define LINKTYPE_JUNIPER_MLPPP 130
237 #define LINKTYPE_JUNIPER_MLFR 131
238 #define LINKTYPE_JUNIPER_ES 132
239 #define LINKTYPE_JUNIPER_GGSN 133
240 #define LINKTYPE_JUNIPER_MFR 134
241 #define LINKTYPE_JUNIPER_ATM2 135
242 #define LINKTYPE_JUNIPER_SERVICES 136
243 #define LINKTYPE_JUNIPER_ATM1 137
244
245 #define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */
246
247 #define LINKTYPE_MTP2_WITH_PHDR 139
248 #define LINKTYPE_MTP2 140
249 #define LINKTYPE_MTP3 141
250 #define LINKTYPE_SCCP 142
251
252 #define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */
253
254 #define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */
255
256 /*
257 * Reserved for IBM SP switch and IBM Next Federation switch.
258 */
259 #define LINKTYPE_IBM_SP 145
260 #define LINKTYPE_IBM_SN 146
261
262 /*
263 * Reserved for private use. If you have some link-layer header type
264 * that you want to use within your organization, with the capture files
265 * using that link-layer header type not ever be sent outside your
266 * organization, you can use these values.
267 *
268 * No libpcap release will use these for any purpose, nor will any
269 * tcpdump release use them, either.
270 *
271 * Do *NOT* use these in capture files that you expect anybody not using
272 * your private versions of capture-file-reading tools to read; in
273 * particular, do *NOT* use them in products, otherwise you may find that
274 * people won't be able to use tcpdump, or snort, or Ethereal, or... to
275 * read capture files from your firewall/intrusion detection/traffic
276 * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value,
277 * and you may also find that the developers of those applications will
278 * not accept patches to let them read those files.
279 *
280 * Also, do not use them if somebody might send you a capture using them
281 * for *their* private type and tools using them for *your* private type
282 * would have to read them.
283 *
284 * Instead, in those cases, ask "tcpdump-workers@lists.tcpdump.org" for a
285 * new DLT_ and LINKTYPE_ value, as per the comment in pcap/bpf.h, and use
286 * the type you're given.
287 */
288 #define LINKTYPE_USER0 147
289 #define LINKTYPE_USER1 148
290 #define LINKTYPE_USER2 149
291 #define LINKTYPE_USER3 150
292 #define LINKTYPE_USER4 151
293 #define LINKTYPE_USER5 152
294 #define LINKTYPE_USER6 153
295 #define LINKTYPE_USER7 154
296 #define LINKTYPE_USER8 155
297 #define LINKTYPE_USER9 156
298 #define LINKTYPE_USER10 157
299 #define LINKTYPE_USER11 158
300 #define LINKTYPE_USER12 159
301 #define LINKTYPE_USER13 160
302 #define LINKTYPE_USER14 161
303 #define LINKTYPE_USER15 162
304
305 /*
306 * For future use with 802.11 captures - defined by AbsoluteValue
307 * Systems to store a number of bits of link-layer information
308 * including radio information:
309 *
310 * http://www.shaftnet.org/~pizza/software/capturefrm.txt
311 */
312 #define LINKTYPE_IEEE802_11_AVS 163 /* 802.11 plus AVS radio metadata header */
313
314 /*
315 * Juniper-private data link type, as per request from
316 * Hannes Gredler <hannes@juniper.net>. The corresponding
317 * DLT_s are used for passing on chassis-internal
318 * metainformation such as QOS profiles, etc..
319 */
320 #define LINKTYPE_JUNIPER_MONITOR 164
321
322 /*
323 * BACnet MS/TP frames.
324 */
325 #define LINKTYPE_BACNET_MS_TP 165
326
327 /*
328 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>.
329 *
330 * This is used in some OSes to allow a kernel socket filter to distinguish
331 * between incoming and outgoing packets, on a socket intended to
332 * supply pppd with outgoing packets so it can do dial-on-demand and
333 * hangup-on-lack-of-demand; incoming packets are filtered out so they
334 * don't cause pppd to hold the connection up (you don't want random
335 * input packets such as port scans, packets from old lost connections,
336 * etc. to force the connection to stay up).
337 *
338 * The first byte of the PPP header (0xff03) is modified to accomodate
339 * the direction - 0x00 = IN, 0x01 = OUT.
340 */
341 #define LINKTYPE_PPP_PPPD 166
342
343 /*
344 * Juniper-private data link type, as per request from
345 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used
346 * for passing on chassis-internal metainformation such as
347 * QOS profiles, cookies, etc..
348 */
349 #define LINKTYPE_JUNIPER_PPPOE 167
350 #define LINKTYPE_JUNIPER_PPPOE_ATM 168
351
352 #define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */
353 #define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */
354 #define LINKTYPE_GPF_F 171 /* GPF-T (ITU-T G.7041/Y.1303) */
355
356 /*
357 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line
358 * monitoring equipment.
359 */
360 #define LINKTYPE_GCOM_T1E1 172
361 #define LINKTYPE_GCOM_SERIAL 173
362
363 /*
364 * Juniper-private data link type, as per request from
365 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used
366 * for internal communication to Physical Interface Cards (PIC)
367 */
368 #define LINKTYPE_JUNIPER_PIC_PEER 174
369
370 /*
371 * Link types requested by Gregor Maier <gregor@endace.com> of Endace
372 * Measurement Systems. They add an ERF header (see
373 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of
374 * the link-layer header.
375 */
376 #define LINKTYPE_ERF_ETH 175 /* Ethernet */
377 #define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */
378
379 /*
380 * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD
381 * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header
382 * includes additional information before the LAPD header, so it's
383 * not necessarily a generic LAPD header.
384 */
385 #define LINKTYPE_LINUX_LAPD 177
386
387 /*
388 * Juniper-private data link type, as per request from
389 * Hannes Gredler <hannes@juniper.net>.
390 * The Link Types are used for prepending meta-information
391 * like interface index, interface name
392 * before standard Ethernet, PPP, Frelay & C-HDLC Frames
393 */
394 #define LINKTYPE_JUNIPER_ETHER 178
395 #define LINKTYPE_JUNIPER_PPP 179
396 #define LINKTYPE_JUNIPER_FRELAY 180
397 #define LINKTYPE_JUNIPER_CHDLC 181
398
399 /*
400 * Multi Link Frame Relay (FRF.16)
401 */
402 #define LINKTYPE_MFR 182
403
404 /*
405 * Juniper-private data link type, as per request from
406 * Hannes Gredler <hannes@juniper.net>.
407 * The DLT_ is used for internal communication with a
408 * voice Adapter Card (PIC)
409 */
410 #define LINKTYPE_JUNIPER_VP 183
411
412 /*
413 * Arinc 429 frames.
414 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
415 * Every frame contains a 32bit A429 label.
416 * More documentation on Arinc 429 can be found at
417 * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf
418 */
419 #define LINKTYPE_A429 184
420
421 /*
422 * Arinc 653 Interpartition Communication messages.
423 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
424 * Please refer to the A653-1 standard for more information.
425 */
426 #define LINKTYPE_A653_ICM 185
427
428 /*
429 * USB packets, beginning with a USB setup header; requested by
430 * Paolo Abeni <paolo.abeni@email.it>.
431 */
432 #define LINKTYPE_USB 186
433
434 /*
435 * Bluetooth HCI UART transport layer (part H:4); requested by
436 * Paolo Abeni.
437 */
438 #define LINKTYPE_BLUETOOTH_HCI_H4 187
439
440 /*
441 * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz
442 * <cruz_petagay@bah.com>.
443 */
444 #define LINKTYPE_IEEE802_16_MAC_CPS 188
445
446 /*
447 * USB packets, beginning with a Linux USB header; requested by
448 * Paolo Abeni <paolo.abeni@email.it>.
449 */
450 #define LINKTYPE_USB_LINUX 189
451
452 /*
453 * Controller Area Network (CAN) v. 2.0B packets.
454 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
455 * Used to dump CAN packets coming from a CAN Vector board.
456 * More documentation on the CAN v2.0B frames can be found at
457 * http://www.can-cia.org/downloads/?269
458 */
459 #define LINKTYPE_CAN20B 190
460
461 /*
462 * IEEE 802.15.4, with address fields padded, as is done by Linux
463 * drivers; requested by Juergen Schimmer.
464 */
465 #define LINKTYPE_IEEE802_15_4_LINUX 191
466
467 /*
468 * Per Packet Information encapsulated packets.
469 * LINKTYPE_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
470 */
471 #define LINKTYPE_PPI 192
472
473 /*
474 * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header;
475 * requested by Charles Clancy.
476 */
477 #define LINKTYPE_IEEE802_16_MAC_CPS_RADIO 193
478
479 /*
480 * Juniper-private data link type, as per request from
481 * Hannes Gredler <hannes@juniper.net>.
482 * The DLT_ is used for internal communication with a
483 * integrated service module (ISM).
484 */
485 #define LINKTYPE_JUNIPER_ISM 194
486
487 /*
488 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
489 * nothing); requested by Mikko Saarnivala <mikko.saarnivala@sensinode.com>.
490 */
491 #define LINKTYPE_IEEE802_15_4 195
492
493 /*
494 * Various link-layer types, with a pseudo-header, for SITA
495 * (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com).
496 */
497 #define LINKTYPE_SITA 196
498
499 /*
500 * Various link-layer types, with a pseudo-header, for Endace DAG cards;
501 * encapsulates Endace ERF records. Requested by Stephen Donnelly
502 * <stephen@endace.com>.
503 */
504 #define LINKTYPE_ERF 197
505
506 /*
507 * Special header prepended to Ethernet packets when capturing from a
508 * u10 Networks board. Requested by Phil Mulholland
509 * <phil@u10networks.com>.
510 */
511 #define LINKTYPE_RAIF1 198
512
513 /*
514 * IPMB packet for IPMI, beginning with the I2C slave address, followed
515 * by the netFn and LUN, etc.. Requested by Chanthy Toeung
516 * <chanthy.toeung@ca.kontron.com>.
517 */
518 #define LINKTYPE_IPMB 199
519
520 /*
521 * Juniper-private data link type, as per request from
522 * Hannes Gredler <hannes@juniper.net>.
523 * The DLT_ is used for capturing data on a secure tunnel interface.
524 */
525 #define LINKTYPE_JUNIPER_ST 200
526
527 /*
528 * Bluetooth HCI UART transport layer (part H:4), with pseudo-header
529 * that includes direction information; requested by Paolo Abeni.
530 */
531 #define LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR 201
532
533 /*
534 * AX.25 packet with a 1-byte KISS header; see
535 *
536 * http://www.ax25.net/kiss.htm
537 *
538 * as per Richard Stearn <richard@rns-stearn.demon.co.uk>.
539 */
540 #define LINKTYPE_AX25_KISS 202
541
542 /*
543 * LAPD packets from an ISDN channel, starting with the address field,
544 * with no pseudo-header.
545 * Requested by Varuna De Silva <varunax@gmail.com>.
546 */
547 #define LINKTYPE_LAPD 203
548
549 /*
550 * Variants of various link-layer headers, with a one-byte direction
551 * pseudo-header prepended - zero means "received by this host",
552 * non-zero (any non-zero value) means "sent by this host" - as per
553 * Will Barker <w.barker@zen.co.uk>.
554 */
555 #define LINKTYPE_PPP_WITH_DIR 204 /* PPP */
556 #define LINKTYPE_C_HDLC_WITH_DIR 205 /* Cisco HDLC */
557 #define LINKTYPE_FRELAY_WITH_DIR 206 /* Frame Relay */
558 #define LINKTYPE_LAPB_WITH_DIR 207 /* LAPB */
559
560 /*
561 * 208 is reserved for an as-yet-unspecified proprietary link-layer
562 * type, as requested by Will Barker.
563 */
564
565 /*
566 * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman
567 * <avn@pigeonpoint.com>.
568 */
569 #define LINKTYPE_IPMB_LINUX 209
570
571 /*
572 * FlexRay automotive bus - http://www.flexray.com/ - as requested
573 * by Hannes Kaelber <hannes.kaelber@x2e.de>.
574 */
575 #define LINKTYPE_FLEXRAY 210
576
577 /*
578 * Media Oriented Systems Transport (MOST) bus for multimedia
579 * transport - http://www.mostcooperation.com/ - as requested
580 * by Hannes Kaelber <hannes.kaelber@x2e.de>.
581 */
582 #define LINKTYPE_MOST 211
583
584 /*
585 * Local Interconnect Network (LIN) bus for vehicle networks -
586 * http://www.lin-subbus.org/ - as requested by Hannes Kaelber
587 * <hannes.kaelber@x2e.de>.
588 */
589 #define LINKTYPE_LIN 212
590
591 /*
592 * X2E-private data link type used for serial line capture,
593 * as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
594 */
595 #define LINKTYPE_X2E_SERIAL 213
596
597 /*
598 * X2E-private data link type used for the Xoraya data logger
599 * family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
600 */
601 #define LINKTYPE_X2E_XORAYA 214
602
603 /*
604 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
605 * nothing), but with the PHY-level data for non-ASK PHYs (4 octets
606 * of 0 as preamble, one octet of SFD, one octet of frame length+
607 * reserved bit, and then the MAC-layer data, starting with the
608 * frame control field).
609 *
610 * Requested by Max Filippov <jcmvbkbc@gmail.com>.
611 */
612 #define LINKTYPE_IEEE802_15_4_NONASK_PHY 215
613
614 /*
615 * David Gibson <david@gibson.dropbear.id.au> requested this for
616 * captures from the Linux kernel /dev/input/eventN devices. This
617 * is used to communicate keystrokes and mouse movements from the
618 * Linux kernel to display systems, such as Xorg.
619 */
620 #define LINKTYPE_LINUX_EVDEV 216
621
622 /*
623 * GSM Um and Abis interfaces, preceded by a "gsmtap" header.
624 *
625 * Requested by Harald Welte <laforge@gnumonks.org>.
626 */
627 #define LINKTYPE_GSMTAP_UM 217
628 #define LINKTYPE_GSMTAP_ABIS 218
629
630 /*
631 * MPLS, with an MPLS label as the link-layer header.
632 * Requested by Michele Marchetto <michele@openbsd.org> on behalf
633 * of OpenBSD.
634 */
635 #define LINKTYPE_MPLS 219
636
637 /*
638 * USB packets, beginning with a Linux USB header, with the USB header
639 * padded to 64 bytes; required for memory-mapped access.
640 */
641 #define LINKTYPE_USB_LINUX_MMAPPED 220
642
643 /*
644 * DECT packets, with a pseudo-header; requested by
645 * Matthias Wenzel <tcpdump@mazzoo.de>.
646 */
647 #define LINKTYPE_DECT 221
648
649 /*
650 * From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1@nasa.gov>
651 * Date: Mon, 11 May 2009 11:18:30 -0500
652 *
653 * DLT_AOS. We need it for AOS Space Data Link Protocol.
654 * I have already written dissectors for but need an OK from
655 * legal before I can submit a patch.
656 *
657 */
658 #define LINKTYPE_AOS 222
659
660 /*
661 * Wireless HART (Highway Addressable Remote Transducer)
662 * From the HART Communication Foundation
663 * IES/PAS 62591
664 *
665 * Requested by Sam Roberts <vieuxtech@gmail.com>.
666 */
667 #define LINKTYPE_WIHART 223
668
669 /*
670 * Fibre Channel FC-2 frames, beginning with a Frame_Header.
671 * Requested by Kahou Lei <kahou82@gmail.com>.
672 */
673 #define LINKTYPE_FC_2 224
674
675 /*
676 * Fibre Channel FC-2 frames, beginning with an encoding of the
677 * SOF, and ending with an encoding of the EOF.
678 *
679 * The encodings represent the frame delimiters as 4-byte sequences
680 * representing the corresponding ordered sets, with K28.5
681 * represented as 0xBC, and the D symbols as the corresponding
682 * byte values; for example, SOFi2, which is K28.5 - D21.5 - D1.2 - D21.2,
683 * is represented as 0xBC 0xB5 0x55 0x55.
684 *
685 * Requested by Kahou Lei <kahou82@gmail.com>.
686 */
687 #define LINKTYPE_FC_2_WITH_FRAME_DELIMS 225
688
689 /*
690 * Solaris ipnet pseudo-header; requested by Darren Reed <Darren.Reed@Sun.COM>.
691 *
692 * The pseudo-header starts with a one-byte version number; for version 2,
693 * the pseudo-header is:
694 *
695 * struct dl_ipnetinfo {
696 * u_int8_t dli_version;
697 * u_int8_t dli_family;
698 * u_int16_t dli_htype;
699 * u_int32_t dli_pktlen;
700 * u_int32_t dli_ifindex;
701 * u_int32_t dli_grifindex;
702 * u_int32_t dli_zsrc;
703 * u_int32_t dli_zdst;
704 * };
705 *
706 * dli_version is 2 for the current version of the pseudo-header.
707 *
708 * dli_family is a Solaris address family value, so it's 2 for IPv4
709 * and 26 for IPv6.
710 *
711 * dli_htype is a "hook type" - 0 for incoming packets, 1 for outgoing
712 * packets, and 2 for packets arriving from another zone on the same
713 * machine.
714 *
715 * dli_pktlen is the length of the packet data following the pseudo-header
716 * (so the captured length minus dli_pktlen is the length of the
717 * pseudo-header, assuming the entire pseudo-header was captured).
718 *
719 * dli_ifindex is the interface index of the interface on which the
720 * packet arrived.
721 *
722 * dli_grifindex is the group interface index number (for IPMP interfaces).
723 *
724 * dli_zsrc is the zone identifier for the source of the packet.
725 *
726 * dli_zdst is the zone identifier for the destination of the packet.
727 *
728 * A zone number of 0 is the global zone; a zone number of 0xffffffff
729 * means that the packet arrived from another host on the network, not
730 * from another zone on the same machine.
731 *
732 * An IPv4 or IPv6 datagram follows the pseudo-header; dli_family indicates
733 * which of those it is.
734 */
735 #define LINKTYPE_IPNET 226
736
737 /*
738 * CAN (Controller Area Network) frames, with a pseudo-header as supplied
739 * by Linux SocketCAN. See Documentation/networking/can.txt in the Linux
740 * source.
741 *
742 * Requested by Felix Obenhuber <felix@obenhuber.de>.
743 */
744 #define LINKTYPE_CAN_SOCKETCAN 227
745
746 /*
747 * Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies
748 * whether it's v4 or v6. Requested by Darren Reed <Darren.Reed@Sun.COM>.
749 */
750 #define LINKTYPE_IPV4 228
751 #define LINKTYPE_IPV6 229
752
753 /*
754 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
755 * nothing), and with no FCS at the end of the frame; requested by
756 * Jon Smirl <jonsmirl@gmail.com>.
757 */
758 #define LINKTYPE_IEEE802_15_4_NOFCS 230
759
760 /*
761 * Raw D-Bus:
762 *
763 * http://www.freedesktop.org/wiki/Software/dbus
764 *
765 * messages:
766 *
767 * http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages
768 *
769 * starting with the endianness flag, followed by the message type, etc.,
770 * but without the authentication handshake before the message sequence:
771 *
772 * http://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol
773 *
774 * Requested by Martin Vidner <martin@vidner.net>.
775 */
776 #define LINKTYPE_DBUS 231
777
778 /*
779 * Juniper-private data link type, as per request from
780 * Hannes Gredler <hannes@juniper.net>.
781 */
782 #define LINKTYPE_JUNIPER_VS 232
783 #define LINKTYPE_JUNIPER_SRX_E2E 233
784 #define LINKTYPE_JUNIPER_FIBRECHANNEL 234
785
786 /*
787 * DVB-CI (DVB Common Interface for communication between a PC Card
788 * module and a DVB receiver). See
789 *
790 * http://www.kaiser.cx/pcap-dvbci.html
791 *
792 * for the specification.
793 *
794 * Requested by Martin Kaiser <martin@kaiser.cx>.
795 */
796 #define LINKTYPE_DVB_CI 235
797
798 /*
799 * Variant of 3GPP TS 27.010 multiplexing protocol. Requested
800 * by Hans-Christoph Schemmel <hans-christoph.schemmel@cinterion.com>.
801 */
802 #define LINKTYPE_MUX27010 236
803
804 /*
805 * STANAG 5066 D_PDUs. Requested by M. Baris Demiray
806 * <barisdemiray@gmail.com>.
807 */
808 #define LINKTYPE_STANAG_5066_D_PDU 237
809
810 /*
811 * Juniper-private data link type, as per request from
812 * Hannes Gredler <hannes@juniper.net>.
813 */
814 #define LINKTYPE_JUNIPER_ATM_CEMIC 238
815
816 /*
817 * NetFilter LOG messages
818 * (payload of netlink NFNL_SUBSYS_ULOG/NFULNL_MSG_PACKET packets)
819 *
820 * Requested by Jakub Zawadzki <darkjames-ws@darkjames.pl>
821 */
822 #define LINKTYPE_NFLOG 239
823
824 /*
825 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type
826 * for Ethernet packets with a 4-byte pseudo-header and always
827 * with the payload including the FCS, as supplied by their
828 * netANALYZER hardware and software.
829 *
830 * Requested by Holger P. Frommer <HPfrommer@hilscher.com>
831 */
832 #define LINKTYPE_NETANALYZER 240
833
834 /*
835 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type
836 * for Ethernet packets with a 4-byte pseudo-header and FCS and
837 * 1 byte of SFD, as supplied by their netANALYZER hardware and
838 * software.
839 *
840 * Requested by Holger P. Frommer <HPfrommer@hilscher.com>
841 */
842 #define LINKTYPE_NETANALYZER_TRANSPARENT 241
843
844 /*
845 * IP-over-InfiniBand, as specified by RFC 4391.
846 *
847 * Requested by Petr Sumbera <petr.sumbera@oracle.com>.
848 */
849 #define LINKTYPE_IPOIB 242
850
851 /*
852 * MPEG-2 transport stream (ISO 13818-1/ITU-T H.222.0).
853 *
854 * Requested by Guy Martin <gmsoft@tuxicoman.be>.
855 */
856 #define LINKTYPE_MPEG_2_TS 243
857
858 /*
859 * ng4T GmbH's UMTS Iub/Iur-over-ATM and Iub/Iur-over-IP format as
860 * used by their ng40 protocol tester.
861 *
862 * Requested by Jens Grimmer <jens.grimmer@ng4t.com>.
863 */
864 #define LINKTYPE_NG40 244
865
866 /*
867 * Pseudo-header giving adapter number and flags, followed by an NFC
868 * (Near-Field Communications) Logical Link Control Protocol (LLCP) PDU,
869 * as specified by NFC Forum Logical Link Control Protocol Technical
870 * Specification LLCP 1.1.
871 *
872 * Requested by Mike Wakerly <mikey@google.com>.
873 */
874 #define LINKTYPE_NFC_LLCP 245
875
876 /*
877 * pfsync output; DLT_PFSYNC is 18, which collides with DLT_CIP in
878 * SuSE 6.3, on OpenBSD, NetBSD, DragonFly BSD, and Mac OS X, and
879 * is 121, which collides with DLT_HHDLC, in FreeBSD. We pick a
880 * shiny new link-layer header type value that doesn't collide with
881 * anything, in the hopes that future pfsync savefiles, if any,
882 * won't require special hacks to distinguish from other savefiles.
883 *
884 */
885 #define LINKTYPE_PFSYNC 246
886
887 /*
888 * Raw InfiniBand packets, starting with the Local Routing Header.
889 *
890 * Requested by Oren Kladnitsky <orenk@mellanox.com>.
891 */
892 #define LINKTYPE_INFINIBAND 247
893
894 /*
895 * SCTP, with no lower-level protocols (i.e., no IPv4 or IPv6).
896 *
897 * Requested by Michael Tuexen <Michael.Tuexen@lurchi.franken.de>.
898 */
899 #define LINKTYPE_SCTP 248
900
901 /*
902 * USB packets, beginning with a USBPcap header.
903 *
904 * Requested by Tomasz Mon <desowin@gmail.com>
905 */
906 #define LINKTYPE_USBPCAP 249
907
908 /*
909 * Schweitzer Engineering Laboratories "RTAC" product serial-line
910 * packets.
911 *
912 * Requested by Chris Bontje <chris_bontje@selinc.com>.
913 */
914 #define DLT_RTAC_SERIAL 250
915
916 /*
917 * Bluetooth Low Energy air interface link-layer packets.
918 *
919 * Requested by Mike Kershaw <dragorn@kismetwireless.net>.
920 */
921 #define LINKTYPE_BLUETOOTH_LE_LL 251
922
923 /*
924 * Link-layer header type for upper-protocol layer PDU saves from wireshark.
925 *
926 * the actual contents are determined by two TAGs stored with each
927 * packet:
928 * EXP_PDU_TAG_LINKTYPE the link type (LINKTYPE_ value) of the
929 * original packet.
930 *
931 * EXP_PDU_TAG_PROTO_NAME the name of the wireshark dissector
932 * that can make sense of the data stored.
933 */
934 #define LINKTYPE_WIRESHARK_UPPER_PDU 252
935
936 #define LINKTYPE_MATCHING_MAX 252 /* highest value in the "matching" range */
937
938 static struct linktype_map {
939 int dlt;
940 int linktype;
941 } map[] = {
942 /*
943 * These DLT_* codes have LINKTYPE_* codes with values identical
944 * to the values of the corresponding DLT_* code.
945 */
946 { DLT_NULL, LINKTYPE_NULL },
947 { DLT_EN10MB, LINKTYPE_ETHERNET },
948 { DLT_EN3MB, LINKTYPE_EXP_ETHERNET },
949 { DLT_AX25, LINKTYPE_AX25 },
950 { DLT_PRONET, LINKTYPE_PRONET },
951 { DLT_CHAOS, LINKTYPE_CHAOS },
952 { DLT_IEEE802, LINKTYPE_IEEE802_5 },
953 { DLT_ARCNET, LINKTYPE_ARCNET_BSD },
954 { DLT_SLIP, LINKTYPE_SLIP },
955 { DLT_PPP, LINKTYPE_PPP },
956 { DLT_FDDI, LINKTYPE_FDDI },
957 { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL },
958
959 /*
960 * These DLT_* codes have different values on different
961 * platforms; we map them to LINKTYPE_* codes that
962 * have values that should never be equal to any DLT_*
963 * code.
964 */
965 #ifdef DLT_FR
966 /* BSD/OS Frame Relay */
967 { DLT_FR, LINKTYPE_FRELAY },
968 #endif
969
970 { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 },
971 { DLT_RAW, LINKTYPE_RAW },
972 { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS },
973 { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS },
974
975 /* BSD/OS Cisco HDLC */
976 { DLT_C_HDLC, LINKTYPE_C_HDLC },
977
978 /*
979 * These DLT_* codes are not on all platforms, but, so far,
980 * there don't appear to be any platforms that define
981 * other codes with those values; we map them to
982 * different LINKTYPE_* values anyway, just in case.
983 */
984
985 /* Linux ATM Classical IP */
986 { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP },
987
988 /* NetBSD sync/async serial PPP (or Cisco HDLC) */
989 { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC },
990
991 /* NetBSD PPP over Ethernet */
992 { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER },
993
994 /*
995 * All LINKTYPE_ values between LINKTYPE_MATCHING_MIN
996 * and LINKTYPE_MATCHING_MAX are mapped to identical
997 * DLT_ values.
998 */
999
1000 { -1, -1 }
1001 };
1002
1003 int
dlt_to_linktype(int dlt)1004 dlt_to_linktype(int dlt)
1005 {
1006 int i;
1007
1008 /*
1009 * Map DLT_PFSYNC, whatever it might be, to LINKTYPE_PFSYNC.
1010 */
1011 if (dlt == DLT_PFSYNC)
1012 return (LINKTYPE_PFSYNC);
1013
1014 /*
1015 * Map the values in the matching range.
1016 */
1017 if (dlt >= DLT_MATCHING_MIN && dlt <= DLT_MATCHING_MAX)
1018 return (dlt);
1019
1020 /*
1021 * Map the values outside that range.
1022 */
1023 for (i = 0; map[i].dlt != -1; i++) {
1024 if (map[i].dlt == dlt)
1025 return (map[i].linktype);
1026 }
1027
1028 /*
1029 * If we don't have a mapping for this DLT_ code, return an
1030 * error; that means that this is a value with no corresponding
1031 * LINKTYPE_ code, and we need to assign one.
1032 */
1033 return (-1);
1034 }
1035
1036 int
linktype_to_dlt(int linktype)1037 linktype_to_dlt(int linktype)
1038 {
1039 int i;
1040
1041 /*
1042 * Map LINKTYPE_PFSYNC to DLT_PFSYNC, whatever it might be.
1043 * LINKTYPE_PFSYNC is in the matching range, to make sure
1044 * it's as safe from reuse as we can arrange, so we do
1045 * this test first.
1046 */
1047 if (linktype == LINKTYPE_PFSYNC)
1048 return (DLT_PFSYNC);
1049
1050 /*
1051 * Map the values in the matching range.
1052 */
1053 if (linktype >= LINKTYPE_MATCHING_MIN &&
1054 linktype <= LINKTYPE_MATCHING_MAX)
1055 return (linktype);
1056
1057 /*
1058 * Map the values outside that range.
1059 */
1060 for (i = 0; map[i].linktype != -1; i++) {
1061 if (map[i].linktype == linktype)
1062 return (map[i].dlt);
1063 }
1064
1065 /*
1066 * If we don't have an entry for this link type, return
1067 * the link type value; it may be a DLT_ value from an
1068 * older version of libpcap.
1069 */
1070 return linktype;
1071 }
1072
1073 /*
1074 * The DLT_USB_LINUX and DLT_USB_LINUX_MMAPPED headers are in host
1075 * byte order when capturing (it's supplied directly from a
1076 * memory-mapped buffer shared by the kernel).
1077 *
1078 * When reading a DLT_USB_LINUX or DLT_USB_LINUX_MMAPPED capture file,
1079 * we need to convert it from the byte order of the host that wrote
1080 * the file to this host's byte order.
1081 */
1082 static void
swap_linux_usb_header(const struct pcap_pkthdr * hdr,u_char * buf,int header_len_64_bytes)1083 swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf,
1084 int header_len_64_bytes)
1085 {
1086 pcap_usb_header_mmapped *uhdr = (pcap_usb_header_mmapped *)buf;
1087 bpf_u_int32 offset = 0;
1088 usb_isodesc *pisodesc;
1089 int32_t numdesc, i;
1090
1091 /*
1092 * "offset" is the offset *past* the field we're swapping;
1093 * we skip the field *before* checking to make sure
1094 * the captured data length includes the entire field.
1095 */
1096
1097 /*
1098 * The URB id is a totally opaque value; do we really need to
1099 * convert it to the reading host's byte order???
1100 */
1101 offset += 8; /* skip past id */
1102 if (hdr->caplen < offset)
1103 return;
1104 uhdr->id = SWAPLL(uhdr->id);
1105
1106 offset += 4; /* skip past various 1-byte fields */
1107
1108 offset += 2; /* skip past bus_id */
1109 if (hdr->caplen < offset)
1110 return;
1111 uhdr->bus_id = SWAPSHORT(uhdr->bus_id);
1112
1113 offset += 2; /* skip past various 1-byte fields */
1114
1115 offset += 8; /* skip past ts_sec */
1116 if (hdr->caplen < offset)
1117 return;
1118 uhdr->ts_sec = SWAPLL(uhdr->ts_sec);
1119
1120 offset += 4; /* skip past ts_usec */
1121 if (hdr->caplen < offset)
1122 return;
1123 uhdr->ts_usec = SWAPLONG(uhdr->ts_usec);
1124
1125 offset += 4; /* skip past status */
1126 if (hdr->caplen < offset)
1127 return;
1128 uhdr->status = SWAPLONG(uhdr->status);
1129
1130 offset += 4; /* skip past urb_len */
1131 if (hdr->caplen < offset)
1132 return;
1133 uhdr->urb_len = SWAPLONG(uhdr->urb_len);
1134
1135 offset += 4; /* skip past data_len */
1136 if (hdr->caplen < offset)
1137 return;
1138 uhdr->data_len = SWAPLONG(uhdr->data_len);
1139
1140 if (uhdr->transfer_type == URB_ISOCHRONOUS) {
1141 offset += 4; /* skip past s.iso.error_count */
1142 if (hdr->caplen < offset)
1143 return;
1144 uhdr->s.iso.error_count = SWAPLONG(uhdr->s.iso.error_count);
1145
1146 offset += 4; /* skip past s.iso.numdesc */
1147 if (hdr->caplen < offset)
1148 return;
1149 uhdr->s.iso.numdesc = SWAPLONG(uhdr->s.iso.numdesc);
1150 } else
1151 offset += 8; /* skip USB setup header */
1152
1153 if (header_len_64_bytes) {
1154 /*
1155 * This is either the "version 1" header, with
1156 * 16 bytes of additional fields at the end, or
1157 * a "version 0" header from a memory-mapped
1158 * capture, with 16 bytes of zeroed-out padding
1159 * at the end. Byte swap them as if this were
1160 * a "version 1" header.
1161 */
1162 offset += 4; /* skip past interval */
1163 if (hdr->caplen < offset)
1164 return;
1165 uhdr->interval = SWAPLONG(uhdr->interval);
1166
1167 offset += 4; /* skip past start_frame */
1168 if (hdr->caplen < offset)
1169 return;
1170 uhdr->start_frame = SWAPLONG(uhdr->start_frame);
1171
1172 offset += 4; /* skip past xfer_flags */
1173 if (hdr->caplen < offset)
1174 return;
1175 uhdr->xfer_flags = SWAPLONG(uhdr->xfer_flags);
1176
1177 offset += 4; /* skip past ndesc */
1178 if (hdr->caplen < offset)
1179 return;
1180 uhdr->ndesc = SWAPLONG(uhdr->ndesc);
1181 }
1182
1183 if (uhdr->transfer_type == URB_ISOCHRONOUS) {
1184 /* swap the values in struct linux_usb_isodesc */
1185 pisodesc = (usb_isodesc *)(void *)(buf+offset);
1186 numdesc = uhdr->s.iso.numdesc;
1187 for (i = 0; i < numdesc; i++) {
1188 offset += 4; /* skip past status */
1189 if (hdr->caplen < offset)
1190 return;
1191 pisodesc->status = SWAPLONG(pisodesc->status);
1192
1193 offset += 4; /* skip past offset */
1194 if (hdr->caplen < offset)
1195 return;
1196 pisodesc->offset = SWAPLONG(pisodesc->offset);
1197
1198 offset += 4; /* skip past len */
1199 if (hdr->caplen < offset)
1200 return;
1201 pisodesc->len = SWAPLONG(pisodesc->len);
1202
1203 offset += 4; /* skip past padding */
1204
1205 pisodesc++;
1206 }
1207 }
1208 }
1209
1210 /*
1211 * The DLT_NFLOG "packets" have a mixture of big-endian and host-byte-order
1212 * data. They begin with a fixed-length header with big-endian fields,
1213 * followed by a set of TLVs, where the type and length are in host
1214 * byte order but the values are either big-endian or are a raw byte
1215 * sequence that's the same regardless of the host's byte order.
1216 *
1217 * When reading a DLT_NFLOG capture file, we need to convert the type
1218 * and length values from the byte order of the host that wrote the
1219 * file to the byte order of this host.
1220 */
1221 static void
swap_nflog_header(const struct pcap_pkthdr * hdr,u_char * buf)1222 swap_nflog_header(const struct pcap_pkthdr *hdr, u_char *buf)
1223 {
1224 u_char *p = buf;
1225 nflog_hdr_t *nfhdr = (nflog_hdr_t *)buf;
1226 nflog_tlv_t *tlv;
1227 u_int caplen = hdr->caplen;
1228 u_int length = hdr->len;
1229 u_int16_t size;
1230
1231 if (caplen < (int) sizeof(nflog_hdr_t) || length < (int) sizeof(nflog_hdr_t)) {
1232 /* Not enough data to have any TLVs. */
1233 return;
1234 }
1235
1236 if (!(nfhdr->nflog_version) == 0) {
1237 /* Unknown NFLOG version */
1238 return;
1239 }
1240
1241 length -= sizeof(nflog_hdr_t);
1242 caplen -= sizeof(nflog_hdr_t);
1243 p += sizeof(nflog_hdr_t);
1244
1245 while (caplen >= sizeof(nflog_tlv_t)) {
1246 tlv = (nflog_tlv_t *) p;
1247
1248 /* Swap the type and length. */
1249 tlv->tlv_type = SWAPSHORT(tlv->tlv_type);
1250 tlv->tlv_length = SWAPSHORT(tlv->tlv_length);
1251
1252 /* Get the length of the TLV. */
1253 size = tlv->tlv_length;
1254 if (size % 4 != 0)
1255 size += 4 - size % 4;
1256
1257 /* Is the TLV's length less than the minimum? */
1258 if (size < sizeof(nflog_tlv_t)) {
1259 /* Yes. Give up now. */
1260 return;
1261 }
1262
1263 /* Do we have enough data for the full TLV? */
1264 if (caplen < size || length < size) {
1265 /* No. */
1266 return;
1267 }
1268
1269 /* Skip over the TLV. */
1270 length -= size;
1271 caplen -= size;
1272 p += size;
1273 }
1274 }
1275
1276 void
swap_pseudo_headers(int linktype,struct pcap_pkthdr * hdr,u_char * data)1277 swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr, u_char *data)
1278 {
1279 /*
1280 * Convert pseudo-headers from the byte order of
1281 * the host on which the file was saved to our
1282 * byte order, as necessary.
1283 */
1284 switch (linktype) {
1285
1286 case DLT_USB_LINUX:
1287 swap_linux_usb_header(hdr, data, 0);
1288 break;
1289
1290 case DLT_USB_LINUX_MMAPPED:
1291 swap_linux_usb_header(hdr, data, 1);
1292 break;
1293
1294 case DLT_NFLOG:
1295 swap_nflog_header(hdr, data);
1296 break;
1297 }
1298 }
1299