xref: /freebsd/sys/net/dlt.h (revision 732a02b4e77866604a120a275c082bb6221bd2ff)
1 /*-
2  * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * This code is derived from the Stanford/CMU enet packet filter,
6  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
7  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
8  * Berkeley Laboratory.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  *
34  *      @(#)bpf.h       7.1 (Berkeley) 5/7/91
35  *
36  * $FreeBSD$
37  */
38 
39 #ifndef _NET_DLT_H_
40 #define _NET_DLT_H_
41 
42 /*
43  * Link-layer header type codes.
44  *
45  * Do *NOT* add new values to this list without asking
46  * "tcpdump-workers@lists.tcpdump.org" for a value.  Otherwise, you run
47  * the risk of using a value that's already being used for some other
48  * purpose, and of having tools that read libpcap-format captures not
49  * being able to handle captures with your new DLT_ value, with no hope
50  * that they will ever be changed to do so (as that would destroy their
51  * ability to read captures using that value for that other purpose).
52  *
53  * See
54  *
55  *	http://www.tcpdump.org/linktypes.html
56  *
57  * for detailed descriptions of some of these link-layer header types.
58  */
59 
60 /*
61  * These are the types that are the same on all platforms, and that
62  * have been defined by <net/bpf.h> for ages.
63  */
64 #define DLT_NULL	0	/* BSD loopback encapsulation */
65 #define DLT_EN10MB	1	/* Ethernet (10Mb) */
66 #define DLT_EN3MB	2	/* Experimental Ethernet (3Mb) */
67 #define DLT_AX25	3	/* Amateur Radio AX.25 */
68 #define DLT_PRONET	4	/* Proteon ProNET Token Ring */
69 #define DLT_CHAOS	5	/* Chaos */
70 #define DLT_IEEE802	6	/* 802.5 Token Ring */
71 #define DLT_ARCNET	7	/* ARCNET, with BSD-style header */
72 #define DLT_SLIP	8	/* Serial Line IP */
73 #define DLT_PPP		9	/* Point-to-point Protocol */
74 #define DLT_FDDI	10	/* FDDI */
75 
76 /*
77  * These are types that are different on some platforms, and that
78  * have been defined by <net/bpf.h> for ages.  We use #ifdefs to
79  * detect the BSDs that define them differently from the traditional
80  * libpcap <net/bpf.h>
81  *
82  * XXX - DLT_ATM_RFC1483 is 13 in BSD/OS, and DLT_RAW is 14 in BSD/OS,
83  * but I don't know what the right #define is for BSD/OS.
84  */
85 #define DLT_ATM_RFC1483	11	/* LLC-encapsulated ATM */
86 
87 #ifdef __OpenBSD__
88 #define DLT_RAW		14	/* raw IP */
89 #else
90 #define DLT_RAW		12	/* raw IP */
91 #endif
92 
93 /*
94  * Given that the only OS that currently generates BSD/OS SLIP or PPP
95  * is, well, BSD/OS, arguably everybody should have chosen its values
96  * for DLT_SLIP_BSDOS and DLT_PPP_BSDOS, which are 15 and 16, but they
97  * didn't.  So it goes.
98  */
99 #if defined(__NetBSD__) || defined(__FreeBSD__)
100 #ifndef DLT_SLIP_BSDOS
101 #define DLT_SLIP_BSDOS	13	/* BSD/OS Serial Line IP */
102 #define DLT_PPP_BSDOS	14	/* BSD/OS Point-to-point Protocol */
103 #endif
104 #else
105 #define DLT_SLIP_BSDOS	15	/* BSD/OS Serial Line IP */
106 #define DLT_PPP_BSDOS	16	/* BSD/OS Point-to-point Protocol */
107 #endif
108 
109 /*
110  * 17 was used for DLT_PFLOG in OpenBSD; it no longer is.
111  *
112  * It was DLT_LANE8023 in SuSE 6.3, so we defined LINKTYPE_PFLOG
113  * as 117 so that pflog captures would use a link-layer header type
114  * value that didn't collide with any other values.  On all
115  * platforms other than OpenBSD, we defined DLT_PFLOG as 117,
116  * and we mapped between LINKTYPE_PFLOG and DLT_PFLOG.
117  *
118  * OpenBSD eventually switched to using 117 for DLT_PFLOG as well.
119  *
120  * Don't use 17 for anything else.
121  */
122 
123 /*
124  * 18 is used for DLT_PFSYNC in OpenBSD, NetBSD, DragonFly BSD and
125  * macOS; don't use it for anything else.  (FreeBSD uses 121, which
126  * collides with DLT_HHDLC, even though it doesn't use 18 for
127  * anything and doesn't appear to have ever used it for anything.)
128  *
129  * We define it as 18 on those platforms; it is, unfortunately, used
130  * for DLT_CIP in Suse 6.3, so we don't define it as DLT_PFSYNC
131  * in general.  As the packet format for it, like that for
132  * DLT_PFLOG, is not only OS-dependent but OS-version-dependent,
133  * we don't support printing it in tcpdump except on OSes that
134  * have the relevant header files, so it's not that useful on
135  * other platforms.
136  */
137 #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || defined(__APPLE__)
138 #define DLT_PFSYNC	18
139 #endif
140 
141 #define DLT_ATM_CLIP	19	/* Linux Classical-IP over ATM */
142 
143 /*
144  * Apparently Redback uses this for its SmartEdge 400/800.  I hope
145  * nobody else decided to use it, too.
146  */
147 #define DLT_REDBACK_SMARTEDGE	32
148 
149 /*
150  * These values are defined by NetBSD; other platforms should refrain from
151  * using them for other purposes, so that NetBSD savefiles with link
152  * types of 50 or 51 can be read as this type on all platforms.
153  */
154 #define DLT_PPP_SERIAL	50	/* PPP over serial with HDLC encapsulation */
155 #define DLT_PPP_ETHER	51	/* PPP over Ethernet */
156 
157 /*
158  * The Axent Raptor firewall - now the Symantec Enterprise Firewall - uses
159  * a link-layer type of 99 for the tcpdump it supplies.  The link-layer
160  * header has 6 bytes of unknown data, something that appears to be an
161  * Ethernet type, and 36 bytes that appear to be 0 in at least one capture
162  * I've seen.
163  */
164 #define DLT_SYMANTEC_FIREWALL	99
165 
166 /*
167  * Values between 100 and 103 are used in capture file headers as
168  * link-layer header type LINKTYPE_ values corresponding to DLT_ types
169  * that differ between platforms; don't use those values for new DLT_
170  * new types.
171  */
172 
173 /*
174  * Values starting with 104 are used for newly-assigned link-layer
175  * header type values; for those link-layer header types, the DLT_
176  * value returned by pcap_datalink() and passed to pcap_open_dead(),
177  * and the LINKTYPE_ value that appears in capture files, are the
178  * same.
179  *
180  * DLT_MATCHING_MIN is the lowest such value; DLT_MATCHING_MAX is
181  * the highest such value.
182  */
183 #define DLT_MATCHING_MIN	104
184 
185 /*
186  * This value was defined by libpcap 0.5; platforms that have defined
187  * it with a different value should define it here with that value -
188  * a link type of 104 in a save file will be mapped to DLT_C_HDLC,
189  * whatever value that happens to be, so programs will correctly
190  * handle files with that link type regardless of the value of
191  * DLT_C_HDLC.
192  *
193  * The name DLT_C_HDLC was used by BSD/OS; we use that name for source
194  * compatibility with programs written for BSD/OS.
195  *
196  * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well,
197  * for source compatibility with programs written for libpcap 0.5.
198  */
199 #define DLT_C_HDLC	104	/* Cisco HDLC */
200 #define DLT_CHDLC	DLT_C_HDLC
201 
202 #define DLT_IEEE802_11	105	/* IEEE 802.11 wireless */
203 
204 /*
205  * 106 is reserved for Linux Classical IP over ATM; it's like DLT_RAW,
206  * except when it isn't.  (I.e., sometimes it's just raw IP, and
207  * sometimes it isn't.)  We currently handle it as DLT_LINUX_SLL,
208  * so that we don't have to worry about the link-layer header.)
209  */
210 
211 /*
212  * Frame Relay; BSD/OS has a DLT_FR with a value of 11, but that collides
213  * with other values.
214  * DLT_FR and DLT_FRELAY packets start with the Q.922 Frame Relay header
215  * (DLCI, etc.).
216  */
217 #define DLT_FRELAY	107
218 
219 /*
220  * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except
221  * that the AF_ type in the link-layer header is in network byte order.
222  *
223  * DLT_LOOP is 12 in OpenBSD, but that's DLT_RAW in other OSes, so
224  * we don't use 12 for it in OSes other than OpenBSD.
225  */
226 #ifdef __OpenBSD__
227 #define DLT_LOOP	12
228 #else
229 #define DLT_LOOP	108
230 #endif
231 
232 /*
233  * Encapsulated packets for IPsec; DLT_ENC is 13 in OpenBSD, but that's
234  * DLT_SLIP_BSDOS in NetBSD, so we don't use 13 for it in OSes other
235  * than OpenBSD.
236  */
237 #ifdef __OpenBSD__
238 #define DLT_ENC		13
239 #else
240 #define DLT_ENC		109
241 #endif
242 
243 /*
244  * Values between 110 and 112 are reserved for use in capture file headers
245  * as link-layer types corresponding to DLT_ types that might differ
246  * between platforms; don't use those values for new DLT_ types
247  * other than the corresponding DLT_ types.
248  */
249 
250 /*
251  * This is for Linux cooked sockets.
252  */
253 #define DLT_LINUX_SLL	113
254 
255 /*
256  * Apple LocalTalk hardware.
257  */
258 #define DLT_LTALK	114
259 
260 /*
261  * Acorn Econet.
262  */
263 #define DLT_ECONET	115
264 
265 /*
266  * Reserved for use with OpenBSD ipfilter.
267  */
268 #define DLT_IPFILTER	116
269 
270 /*
271  * OpenBSD DLT_PFLOG.
272  */
273 #define DLT_PFLOG	117
274 
275 /*
276  * Registered for Cisco-internal use.
277  */
278 #define DLT_CISCO_IOS	118
279 
280 /*
281  * For 802.11 cards using the Prism II chips, with a link-layer
282  * header including Prism monitor mode information plus an 802.11
283  * header.
284  */
285 #define DLT_PRISM_HEADER	119
286 
287 /*
288  * Reserved for Aironet 802.11 cards, with an Aironet link-layer header
289  * (see Doug Ambrisko's FreeBSD patches).
290  */
291 #define DLT_AIRONET_HEADER	120
292 
293 /*
294  * Sigh.
295  *
296  * 121 was reserved for Siemens HiPath HDLC on 2002-01-25, as
297  * requested by Tomas Kukosa.
298  *
299  * On 2004-02-25, a FreeBSD checkin to sys/net/bpf.h was made that
300  * assigned 121 as DLT_PFSYNC.  In current versions, its libpcap
301  * does DLT_ <-> LINKTYPE_ mapping, mapping DLT_PFSYNC to a
302  * LINKTYPE_PFSYNC value of 246, so it should write out DLT_PFSYNC
303  * dump files with 246 as the link-layer header type.  (Earlier
304  * versions might not have done mapping, in which case they would
305  * have written them out with a link-layer header type of 121.)
306  *
307  * OpenBSD, from which pf came, however, uses 18 for DLT_PFSYNC;
308  * its libpcap does no DLT_ <-> LINKTYPE_ mapping, so it would
309  * write out DLT_PFSYNC dump files with use 18 as the link-layer
310  * header type.
311  *
312  * NetBSD, DragonFly BSD, and Darwin also use 18 for DLT_PFSYNC; in
313  * current versions, their libpcaps do DLT_ <-> LINKTYPE_ mapping,
314  * mapping DLT_PFSYNC to a LINKTYPE_PFSYNC value of 246, so they
315  * should write out DLT_PFSYNC dump files with 246 as the link-layer
316  * header type.  (Earlier versions might not have done mapping,
317  * in which case they'd work the same way OpenBSD does, writing
318  * them out with a link-layer header type of 18.)
319  *
320  * We'll define DLT_PFSYNC as:
321  *
322  *    18 on NetBSD, OpenBSD, DragonFly BSD, and Darwin;
323  *
324  *    121 on FreeBSD;
325  *
326  *    246 everywhere else.
327  *
328  * We'll define DLT_HHDLC as 121 on everything except for FreeBSD;
329  * anybody who wants to compile, on FreeBSD, code that uses DLT_HHDLC
330  * is out of luck.
331  *
332  * We'll define LINKTYPE_PFSYNC as 246 on *all* platforms, so that
333  * savefiles written using *this* code won't use 18 or 121 for PFSYNC,
334  * they'll all use 246.
335  *
336  * Code that uses pcap_datalink() to determine the link-layer header
337  * type of a savefile won't, when built and run on FreeBSD, be able
338  * to distinguish between LINKTYPE_PFSYNC and LINKTYPE_HHDLC capture
339  * files, as pcap_datalink() will give 121 for both of them.  Code
340  * that doesn't, such as the code in Wireshark, will be able to
341  * distinguish between them.
342  *
343  * FreeBSD's libpcap won't map a link-layer header type of 18 - i.e.,
344  * DLT_PFSYNC files from OpenBSD and possibly older versions of NetBSD,
345  * DragonFly BSD, and macOS - to DLT_PFSYNC, so code built with FreeBSD's
346  * libpcap won't treat those files as DLT_PFSYNC files.
347  *
348  * Other libpcaps won't map a link-layer header type of 121 to DLT_PFSYNC;
349  * this means they can read DLT_HHDLC files, if any exist, but won't
350  * treat pcap files written by any older versions of FreeBSD libpcap that
351  * didn't map to 246 as DLT_PFSYNC files.
352  */
353 #ifdef __FreeBSD__
354 #define DLT_PFSYNC		121
355 #else
356 #define DLT_HHDLC		121
357 #endif
358 
359 /*
360  * This is for RFC 2625 IP-over-Fibre Channel.
361  *
362  * This is not for use with raw Fibre Channel, where the link-layer
363  * header starts with a Fibre Channel frame header; it's for IP-over-FC,
364  * where the link-layer header starts with an RFC 2625 Network_Header
365  * field.
366  */
367 #define DLT_IP_OVER_FC		122
368 
369 /*
370  * This is for Full Frontal ATM on Solaris with SunATM, with a
371  * pseudo-header followed by an AALn PDU.
372  *
373  * There may be other forms of Full Frontal ATM on other OSes,
374  * with different pseudo-headers.
375  *
376  * If ATM software returns a pseudo-header with VPI/VCI information
377  * (and, ideally, packet type information, e.g. signalling, ILMI,
378  * LANE, LLC-multiplexed traffic, etc.), it should not use
379  * DLT_ATM_RFC1483, but should get a new DLT_ value, so tcpdump
380  * and the like don't have to infer the presence or absence of a
381  * pseudo-header and the form of the pseudo-header.
382  */
383 #define DLT_SUNATM		123	/* Solaris+SunATM */
384 
385 /*
386  * Reserved as per request from Kent Dahlgren <kent@praesum.com>
387  * for private use.
388  */
389 #define DLT_RIO                 124     /* RapidIO */
390 #define DLT_PCI_EXP             125     /* PCI Express */
391 #define DLT_AURORA              126     /* Xilinx Aurora link layer */
392 
393 /*
394  * Header for 802.11 plus a number of bits of link-layer information
395  * including radio information, used by some recent BSD drivers as
396  * well as the madwifi Atheros driver for Linux.
397  */
398 #define DLT_IEEE802_11_RADIO	127	/* 802.11 plus radiotap radio header */
399 
400 /*
401  * Reserved for the TZSP encapsulation, as per request from
402  * Chris Waters <chris.waters@networkchemistry.com>
403  * TZSP is a generic encapsulation for any other link type,
404  * which includes a means to include meta-information
405  * with the packet, e.g. signal strength and channel
406  * for 802.11 packets.
407  */
408 #define DLT_TZSP                128     /* Tazmen Sniffer Protocol */
409 
410 /*
411  * BSD's ARCNET headers have the source host, destination host,
412  * and type at the beginning of the packet; that's what's handed
413  * up to userland via BPF.
414  *
415  * Linux's ARCNET headers, however, have a 2-byte offset field
416  * between the host IDs and the type; that's what's handed up
417  * to userland via PF_PACKET sockets.
418  *
419  * We therefore have to have separate DLT_ values for them.
420  */
421 #define DLT_ARCNET_LINUX	129	/* ARCNET */
422 
423 /*
424  * Juniper-private data link types, as per request from
425  * Hannes Gredler <hannes@juniper.net>.  The DLT_s are used
426  * for passing on chassis-internal metainformation such as
427  * QOS profiles, etc..
428  */
429 #define DLT_JUNIPER_MLPPP       130
430 #define DLT_JUNIPER_MLFR        131
431 #define DLT_JUNIPER_ES          132
432 #define DLT_JUNIPER_GGSN        133
433 #define DLT_JUNIPER_MFR         134
434 #define DLT_JUNIPER_ATM2        135
435 #define DLT_JUNIPER_SERVICES    136
436 #define DLT_JUNIPER_ATM1        137
437 
438 /*
439  * Apple IP-over-IEEE 1394, as per a request from Dieter Siegmund
440  * <dieter@apple.com>.  The header that's presented is an Ethernet-like
441  * header:
442  *
443  *	#define FIREWIRE_EUI64_LEN	8
444  *	struct firewire_header {
445  *		u_char  firewire_dhost[FIREWIRE_EUI64_LEN];
446  *		u_char  firewire_shost[FIREWIRE_EUI64_LEN];
447  *		u_short firewire_type;
448  *	};
449  *
450  * with "firewire_type" being an Ethernet type value, rather than,
451  * for example, raw GASP frames being handed up.
452  */
453 #define DLT_APPLE_IP_OVER_IEEE1394	138
454 
455 /*
456  * Various SS7 encapsulations, as per a request from Jeff Morriss
457  * <jeff.morriss[AT]ulticom.com> and subsequent discussions.
458  */
459 #define DLT_MTP2_WITH_PHDR	139	/* pseudo-header with various info, followed by MTP2 */
460 #define DLT_MTP2		140	/* MTP2, without pseudo-header */
461 #define DLT_MTP3		141	/* MTP3, without pseudo-header or MTP2 */
462 #define DLT_SCCP		142	/* SCCP, without pseudo-header or MTP2 or MTP3 */
463 
464 /*
465  * DOCSIS MAC frames.
466  */
467 #define DLT_DOCSIS		143
468 
469 /*
470  * Linux-IrDA packets. Protocol defined at http://www.irda.org.
471  * Those packets include IrLAP headers and above (IrLMP...), but
472  * don't include Phy framing (SOF/EOF/CRC & byte stuffing), because Phy
473  * framing can be handled by the hardware and depend on the bitrate.
474  * This is exactly the format you would get capturing on a Linux-IrDA
475  * interface (irdaX), but not on a raw serial port.
476  * Note the capture is done in "Linux-cooked" mode, so each packet include
477  * a fake packet header (struct sll_header). This is because IrDA packet
478  * decoding is dependant on the direction of the packet (incomming or
479  * outgoing).
480  * When/if other platform implement IrDA capture, we may revisit the
481  * issue and define a real DLT_IRDA...
482  * Jean II
483  */
484 #define DLT_LINUX_IRDA		144
485 
486 /*
487  * Reserved for IBM SP switch and IBM Next Federation switch.
488  */
489 #define DLT_IBM_SP		145
490 #define DLT_IBM_SN		146
491 
492 /*
493  * Reserved for private use.  If you have some link-layer header type
494  * that you want to use within your organization, with the capture files
495  * using that link-layer header type not ever be sent outside your
496  * organization, you can use these values.
497  *
498  * No libpcap release will use these for any purpose, nor will any
499  * tcpdump release use them, either.
500  *
501  * Do *NOT* use these in capture files that you expect anybody not using
502  * your private versions of capture-file-reading tools to read; in
503  * particular, do *NOT* use them in products, otherwise you may find that
504  * people won't be able to use tcpdump, or snort, or Ethereal, or... to
505  * read capture files from your firewall/intrusion detection/traffic
506  * monitoring/etc. appliance, or whatever product uses that DLT_ value,
507  * and you may also find that the developers of those applications will
508  * not accept patches to let them read those files.
509  *
510  * Also, do not use them if somebody might send you a capture using them
511  * for *their* private type and tools using them for *your* private type
512  * would have to read them.
513  *
514  * Instead, ask "tcpdump-workers@lists.tcpdump.org" for a new DLT_ value,
515  * as per the comment above, and use the type you're given.
516  */
517 #define DLT_USER0		147
518 #define DLT_USER1		148
519 #define DLT_USER2		149
520 #define DLT_USER3		150
521 #define DLT_USER4		151
522 #define DLT_USER5		152
523 #define DLT_USER6		153
524 #define DLT_USER7		154
525 #define DLT_USER8		155
526 #define DLT_USER9		156
527 #define DLT_USER10		157
528 #define DLT_USER11		158
529 #define DLT_USER12		159
530 #define DLT_USER13		160
531 #define DLT_USER14		161
532 #define DLT_USER15		162
533 
534 /*
535  * For future use with 802.11 captures - defined by AbsoluteValue
536  * Systems to store a number of bits of link-layer information
537  * including radio information:
538  *
539  *	http://www.shaftnet.org/~pizza/software/capturefrm.txt
540  *
541  * but it might be used by some non-AVS drivers now or in the
542  * future.
543  */
544 #define DLT_IEEE802_11_RADIO_AVS 163	/* 802.11 plus AVS radio header */
545 
546 /*
547  * Juniper-private data link type, as per request from
548  * Hannes Gredler <hannes@juniper.net>.  The DLT_s are used
549  * for passing on chassis-internal metainformation such as
550  * QOS profiles, etc..
551  */
552 #define DLT_JUNIPER_MONITOR     164
553 
554 /*
555  * BACnet MS/TP frames.
556  */
557 #define DLT_BACNET_MS_TP	165
558 
559 /*
560  * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>.
561  *
562  * This is used in some OSes to allow a kernel socket filter to distinguish
563  * between incoming and outgoing packets, on a socket intended to
564  * supply pppd with outgoing packets so it can do dial-on-demand and
565  * hangup-on-lack-of-demand; incoming packets are filtered out so they
566  * don't cause pppd to hold the connection up (you don't want random
567  * input packets such as port scans, packets from old lost connections,
568  * etc. to force the connection to stay up).
569  *
570  * The first byte of the PPP header (0xff03) is modified to accomodate
571  * the direction - 0x00 = IN, 0x01 = OUT.
572  */
573 #define DLT_PPP_PPPD		166
574 
575 /*
576  * Names for backwards compatibility with older versions of some PPP
577  * software; new software should use DLT_PPP_PPPD.
578  */
579 #define DLT_PPP_WITH_DIRECTION	DLT_PPP_PPPD
580 #define DLT_LINUX_PPP_WITHDIRECTION	DLT_PPP_PPPD
581 
582 /*
583  * Juniper-private data link type, as per request from
584  * Hannes Gredler <hannes@juniper.net>.  The DLT_s are used
585  * for passing on chassis-internal metainformation such as
586  * QOS profiles, cookies, etc..
587  */
588 #define DLT_JUNIPER_PPPOE       167
589 #define DLT_JUNIPER_PPPOE_ATM   168
590 
591 #define DLT_GPRS_LLC		169	/* GPRS LLC */
592 #define DLT_GPF_T		170	/* GPF-T (ITU-T G.7041/Y.1303) */
593 #define DLT_GPF_F		171	/* GPF-F (ITU-T G.7041/Y.1303) */
594 
595 /*
596  * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line
597  * monitoring equipment.
598  */
599 #define DLT_GCOM_T1E1		172
600 #define DLT_GCOM_SERIAL		173
601 
602 /*
603  * Juniper-private data link type, as per request from
604  * Hannes Gredler <hannes@juniper.net>.  The DLT_ is used
605  * for internal communication to Physical Interface Cards (PIC)
606  */
607 #define DLT_JUNIPER_PIC_PEER    174
608 
609 /*
610  * Link types requested by Gregor Maier <gregor@endace.com> of Endace
611  * Measurement Systems.  They add an ERF header (see
612  * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of
613  * the link-layer header.
614  */
615 #define DLT_ERF_ETH		175	/* Ethernet */
616 #define DLT_ERF_POS		176	/* Packet-over-SONET */
617 
618 /*
619  * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD
620  * for vISDN (http://www.orlandi.com/visdn/).  Its link-layer header
621  * includes additional information before the LAPD header, so it's
622  * not necessarily a generic LAPD header.
623  */
624 #define DLT_LINUX_LAPD		177
625 
626 /*
627  * Juniper-private data link type, as per request from
628  * Hannes Gredler <hannes@juniper.net>.
629  * The DLT_ are used for prepending meta-information
630  * like interface index, interface name
631  * before standard Ethernet, PPP, Frelay & C-HDLC Frames
632  */
633 #define DLT_JUNIPER_ETHER       178
634 #define DLT_JUNIPER_PPP         179
635 #define DLT_JUNIPER_FRELAY      180
636 #define DLT_JUNIPER_CHDLC       181
637 
638 /*
639  * Multi Link Frame Relay (FRF.16)
640  */
641 #define DLT_MFR                 182
642 
643 /*
644  * Juniper-private data link type, as per request from
645  * Hannes Gredler <hannes@juniper.net>.
646  * The DLT_ is used for internal communication with a
647  * voice Adapter Card (PIC)
648  */
649 #define DLT_JUNIPER_VP          183
650 
651 /*
652  * Arinc 429 frames.
653  * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
654  * Every frame contains a 32bit A429 label.
655  * More documentation on Arinc 429 can be found at
656  * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf
657  */
658 #define DLT_A429                184
659 
660 /*
661  * Arinc 653 Interpartition Communication messages.
662  * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
663  * Please refer to the A653-1 standard for more information.
664  */
665 #define DLT_A653_ICM            185
666 
667 /*
668  * This used to be "USB packets, beginning with a USB setup header;
669  * requested by Paolo Abeni <paolo.abeni@email.it>."
670  *
671  * However, that header didn't work all that well - it left out some
672  * useful information - and was abandoned in favor of the DLT_USB_LINUX
673  * header.
674  *
675  * This is now used by FreeBSD for its BPF taps for USB; that has its
676  * own headers.  So it is written, so it is done.
677  *
678  * For source-code compatibility, we also define DLT_USB to have this
679  * value.  We do it numerically so that, if code that includes this
680  * file (directly or indirectly) also includes an OS header that also
681  * defines DLT_USB as 186, we don't get a redefinition warning.
682  * (NetBSD 7 does that.)
683  */
684 #define DLT_USB_FREEBSD		186
685 #define DLT_USB			186
686 
687 /*
688  * Bluetooth HCI UART transport layer (part H:4); requested by
689  * Paolo Abeni.
690  */
691 #define DLT_BLUETOOTH_HCI_H4	187
692 
693 /*
694  * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz
695  * <cruz_petagay@bah.com>.
696  */
697 #define DLT_IEEE802_16_MAC_CPS	188
698 
699 /*
700  * USB packets, beginning with a Linux USB header; requested by
701  * Paolo Abeni <paolo.abeni@email.it>.
702  */
703 #define DLT_USB_LINUX		189
704 
705 /*
706  * Controller Area Network (CAN) v. 2.0B packets.
707  * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
708  * Used to dump CAN packets coming from a CAN Vector board.
709  * More documentation on the CAN v2.0B frames can be found at
710  * http://www.can-cia.org/downloads/?269
711  */
712 #define DLT_CAN20B              190
713 
714 /*
715  * IEEE 802.15.4, with address fields padded, as is done by Linux
716  * drivers; requested by Juergen Schimmer.
717  */
718 #define DLT_IEEE802_15_4_LINUX	191
719 
720 /*
721  * Per Packet Information encapsulated packets.
722  * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
723  */
724 #define DLT_PPI			192
725 
726 /*
727  * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header;
728  * requested by Charles Clancy.
729  */
730 #define DLT_IEEE802_16_MAC_CPS_RADIO	193
731 
732 /*
733  * Juniper-private data link type, as per request from
734  * Hannes Gredler <hannes@juniper.net>.
735  * The DLT_ is used for internal communication with a
736  * integrated service module (ISM).
737  */
738 #define DLT_JUNIPER_ISM         194
739 
740 /*
741  * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
742  * nothing); requested by Mikko Saarnivala <mikko.saarnivala@sensinode.com>.
743  * For this one, we expect the FCS to be present at the end of the frame;
744  * if the frame has no FCS, DLT_IEEE802_15_4_NOFCS should be used.
745  */
746 #define DLT_IEEE802_15_4	195
747 
748 /*
749  * Various link-layer types, with a pseudo-header, for SITA
750  * (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com).
751  */
752 #define DLT_SITA		196
753 
754 /*
755  * Various link-layer types, with a pseudo-header, for Endace DAG cards;
756  * encapsulates Endace ERF records.  Requested by Stephen Donnelly
757  * <stephen@endace.com>.
758  */
759 #define DLT_ERF			197
760 
761 /*
762  * Special header prepended to Ethernet packets when capturing from a
763  * u10 Networks board.  Requested by Phil Mulholland
764  * <phil@u10networks.com>.
765  */
766 #define DLT_RAIF1		198
767 
768 /*
769  * IPMB packet for IPMI, beginning with the I2C slave address, followed
770  * by the netFn and LUN, etc..  Requested by Chanthy Toeung
771  * <chanthy.toeung@ca.kontron.com>.
772  *
773  * XXX - this used to be called DLT_IPMB, back when we got the
774  * impression from the email thread requesting it that the packet
775  * had no extra 2-byte header.  We've renamed it; if anybody used
776  * DLT_IPMB and assumed no 2-byte header, this will cause the compile
777  * to fail, at which point we'll have to figure out what to do about
778  * the two header types using the same DLT_/LINKTYPE_ value.  If that
779  * doesn't happen, we'll assume nobody used it and that the redefinition
780  * is safe.
781  */
782 #define DLT_IPMB_KONTRON	199
783 
784 /*
785  * Juniper-private data link type, as per request from
786  * Hannes Gredler <hannes@juniper.net>.
787  * The DLT_ is used for capturing data on a secure tunnel interface.
788  */
789 #define DLT_JUNIPER_ST          200
790 
791 /*
792  * Bluetooth HCI UART transport layer (part H:4), with pseudo-header
793  * that includes direction information; requested by Paolo Abeni.
794  */
795 #define DLT_BLUETOOTH_HCI_H4_WITH_PHDR	201
796 
797 /*
798  * AX.25 packet with a 1-byte KISS header; see
799  *
800  *	http://www.ax25.net/kiss.htm
801  *
802  * as per Richard Stearn <richard@rns-stearn.demon.co.uk>.
803  */
804 #define DLT_AX25_KISS		202
805 
806 /*
807  * LAPD packets from an ISDN channel, starting with the address field,
808  * with no pseudo-header.
809  * Requested by Varuna De Silva <varunax@gmail.com>.
810  */
811 #define DLT_LAPD		203
812 
813 /*
814  * Variants of various link-layer headers, with a one-byte direction
815  * pseudo-header prepended - zero means "received by this host",
816  * non-zero (any non-zero value) means "sent by this host" - as per
817  * Will Barker <w.barker@zen.co.uk>.
818  */
819 #define DLT_PPP_WITH_DIR	204	/* PPP - don't confuse with DLT_PPP_WITH_DIRECTION */
820 #define DLT_C_HDLC_WITH_DIR	205	/* Cisco HDLC */
821 #define DLT_FRELAY_WITH_DIR	206	/* Frame Relay */
822 #define DLT_LAPB_WITH_DIR	207	/* LAPB */
823 
824 /*
825  * 208 is reserved for an as-yet-unspecified proprietary link-layer
826  * type, as requested by Will Barker.
827  */
828 
829 /*
830  * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman
831  * <avn@pigeonpoint.com>.
832  */
833 #define DLT_IPMB_LINUX		209
834 
835 /*
836  * FlexRay automotive bus - http://www.flexray.com/ - as requested
837  * by Hannes Kaelber <hannes.kaelber@x2e.de>.
838  */
839 #define DLT_FLEXRAY		210
840 
841 /*
842  * Media Oriented Systems Transport (MOST) bus for multimedia
843  * transport - http://www.mostcooperation.com/ - as requested
844  * by Hannes Kaelber <hannes.kaelber@x2e.de>.
845  */
846 #define DLT_MOST		211
847 
848 /*
849  * Local Interconnect Network (LIN) bus for vehicle networks -
850  * http://www.lin-subbus.org/ - as requested by Hannes Kaelber
851  * <hannes.kaelber@x2e.de>.
852  */
853 #define DLT_LIN			212
854 
855 /*
856  * X2E-private data link type used for serial line capture,
857  * as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
858  */
859 #define DLT_X2E_SERIAL		213
860 
861 /*
862  * X2E-private data link type used for the Xoraya data logger
863  * family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
864  */
865 #define DLT_X2E_XORAYA		214
866 
867 /*
868  * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
869  * nothing), but with the PHY-level data for non-ASK PHYs (4 octets
870  * of 0 as preamble, one octet of SFD, one octet of frame length+
871  * reserved bit, and then the MAC-layer data, starting with the
872  * frame control field).
873  *
874  * Requested by Max Filippov <jcmvbkbc@gmail.com>.
875  */
876 #define DLT_IEEE802_15_4_NONASK_PHY	215
877 
878 /*
879  * David Gibson <david@gibson.dropbear.id.au> requested this for
880  * captures from the Linux kernel /dev/input/eventN devices. This
881  * is used to communicate keystrokes and mouse movements from the
882  * Linux kernel to display systems, such as Xorg.
883  */
884 #define DLT_LINUX_EVDEV		216
885 
886 /*
887  * GSM Um and Abis interfaces, preceded by a "gsmtap" header.
888  *
889  * Requested by Harald Welte <laforge@gnumonks.org>.
890  */
891 #define DLT_GSMTAP_UM		217
892 #define DLT_GSMTAP_ABIS		218
893 
894 /*
895  * MPLS, with an MPLS label as the link-layer header.
896  * Requested by Michele Marchetto <michele@openbsd.org> on behalf
897  * of OpenBSD.
898  */
899 #define DLT_MPLS		219
900 
901 /*
902  * USB packets, beginning with a Linux USB header, with the USB header
903  * padded to 64 bytes; required for memory-mapped access.
904  */
905 #define DLT_USB_LINUX_MMAPPED	220
906 
907 /*
908  * DECT packets, with a pseudo-header; requested by
909  * Matthias Wenzel <tcpdump@mazzoo.de>.
910  */
911 #define DLT_DECT		221
912 
913 /*
914  * From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1@nasa.gov>
915  * Date: Mon, 11 May 2009 11:18:30 -0500
916  *
917  * DLT_AOS. We need it for AOS Space Data Link Protocol.
918  *   I have already written dissectors for but need an OK from
919  *   legal before I can submit a patch.
920  *
921  */
922 #define DLT_AOS                 222
923 
924 /*
925  * Wireless HART (Highway Addressable Remote Transducer)
926  * From the HART Communication Foundation
927  * IES/PAS 62591
928  *
929  * Requested by Sam Roberts <vieuxtech@gmail.com>.
930  */
931 #define DLT_WIHART		223
932 
933 /*
934  * Fibre Channel FC-2 frames, beginning with a Frame_Header.
935  * Requested by Kahou Lei <kahou82@gmail.com>.
936  */
937 #define DLT_FC_2		224
938 
939 /*
940  * Fibre Channel FC-2 frames, beginning with an encoding of the
941  * SOF, and ending with an encoding of the EOF.
942  *
943  * The encodings represent the frame delimiters as 4-byte sequences
944  * representing the corresponding ordered sets, with K28.5
945  * represented as 0xBC, and the D symbols as the corresponding
946  * byte values; for example, SOFi2, which is K28.5 - D21.5 - D1.2 - D21.2,
947  * is represented as 0xBC 0xB5 0x55 0x55.
948  *
949  * Requested by Kahou Lei <kahou82@gmail.com>.
950  */
951 #define DLT_FC_2_WITH_FRAME_DELIMS	225
952 
953 /*
954  * Solaris ipnet pseudo-header; requested by Darren Reed <Darren.Reed@Sun.COM>.
955  *
956  * The pseudo-header starts with a one-byte version number; for version 2,
957  * the pseudo-header is:
958  *
959  * struct dl_ipnetinfo {
960  *     uint8_t   dli_version;
961  *     uint8_t   dli_family;
962  *     uint16_t  dli_htype;
963  *     uint32_t  dli_pktlen;
964  *     uint32_t  dli_ifindex;
965  *     uint32_t  dli_grifindex;
966  *     uint32_t  dli_zsrc;
967  *     uint32_t  dli_zdst;
968  * };
969  *
970  * dli_version is 2 for the current version of the pseudo-header.
971  *
972  * dli_family is a Solaris address family value, so it's 2 for IPv4
973  * and 26 for IPv6.
974  *
975  * dli_htype is a "hook type" - 0 for incoming packets, 1 for outgoing
976  * packets, and 2 for packets arriving from another zone on the same
977  * machine.
978  *
979  * dli_pktlen is the length of the packet data following the pseudo-header
980  * (so the captured length minus dli_pktlen is the length of the
981  * pseudo-header, assuming the entire pseudo-header was captured).
982  *
983  * dli_ifindex is the interface index of the interface on which the
984  * packet arrived.
985  *
986  * dli_grifindex is the group interface index number (for IPMP interfaces).
987  *
988  * dli_zsrc is the zone identifier for the source of the packet.
989  *
990  * dli_zdst is the zone identifier for the destination of the packet.
991  *
992  * A zone number of 0 is the global zone; a zone number of 0xffffffff
993  * means that the packet arrived from another host on the network, not
994  * from another zone on the same machine.
995  *
996  * An IPv4 or IPv6 datagram follows the pseudo-header; dli_family indicates
997  * which of those it is.
998  */
999 #define DLT_IPNET		226
1000 
1001 /*
1002  * CAN (Controller Area Network) frames, with a pseudo-header as supplied
1003  * by Linux SocketCAN, and with multi-byte numerical fields in that header
1004  * in big-endian byte order.
1005  *
1006  * See Documentation/networking/can.txt in the Linux source.
1007  *
1008  * Requested by Felix Obenhuber <felix@obenhuber.de>.
1009  */
1010 #define DLT_CAN_SOCKETCAN	227
1011 
1012 /*
1013  * Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies
1014  * whether it's v4 or v6.  Requested by Darren Reed <Darren.Reed@Sun.COM>.
1015  */
1016 #define DLT_IPV4		228
1017 #define DLT_IPV6		229
1018 
1019 /*
1020  * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
1021  * nothing), and with no FCS at the end of the frame; requested by
1022  * Jon Smirl <jonsmirl@gmail.com>.
1023  */
1024 #define DLT_IEEE802_15_4_NOFCS	230
1025 
1026 /*
1027  * Raw D-Bus:
1028  *
1029  *	http://www.freedesktop.org/wiki/Software/dbus
1030  *
1031  * messages:
1032  *
1033  *	http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages
1034  *
1035  * starting with the endianness flag, followed by the message type, etc.,
1036  * but without the authentication handshake before the message sequence:
1037  *
1038  *	http://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol
1039  *
1040  * Requested by Martin Vidner <martin@vidner.net>.
1041  */
1042 #define DLT_DBUS		231
1043 
1044 /*
1045  * Juniper-private data link type, as per request from
1046  * Hannes Gredler <hannes@juniper.net>.
1047  */
1048 #define DLT_JUNIPER_VS			232
1049 #define DLT_JUNIPER_SRX_E2E		233
1050 #define DLT_JUNIPER_FIBRECHANNEL	234
1051 
1052 /*
1053  * DVB-CI (DVB Common Interface for communication between a PC Card
1054  * module and a DVB receiver).  See
1055  *
1056  *	http://www.kaiser.cx/pcap-dvbci.html
1057  *
1058  * for the specification.
1059  *
1060  * Requested by Martin Kaiser <martin@kaiser.cx>.
1061  */
1062 #define DLT_DVB_CI		235
1063 
1064 /*
1065  * Variant of 3GPP TS 27.010 multiplexing protocol (similar to, but
1066  * *not* the same as, 27.010).  Requested by Hans-Christoph Schemmel
1067  * <hans-christoph.schemmel@cinterion.com>.
1068  */
1069 #define DLT_MUX27010		236
1070 
1071 /*
1072  * STANAG 5066 D_PDUs.  Requested by M. Baris Demiray
1073  * <barisdemiray@gmail.com>.
1074  */
1075 #define DLT_STANAG_5066_D_PDU	237
1076 
1077 /*
1078  * Juniper-private data link type, as per request from
1079  * Hannes Gredler <hannes@juniper.net>.
1080  */
1081 #define DLT_JUNIPER_ATM_CEMIC	238
1082 
1083 /*
1084  * NetFilter LOG messages
1085  * (payload of netlink NFNL_SUBSYS_ULOG/NFULNL_MSG_PACKET packets)
1086  *
1087  * Requested by Jakub Zawadzki <darkjames-ws@darkjames.pl>
1088  */
1089 #define DLT_NFLOG		239
1090 
1091 /*
1092  * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type
1093  * for Ethernet packets with a 4-byte pseudo-header and always
1094  * with the payload including the FCS, as supplied by their
1095  * netANALYZER hardware and software.
1096  *
1097  * Requested by Holger P. Frommer <HPfrommer@hilscher.com>
1098  */
1099 #define DLT_NETANALYZER		240
1100 
1101 /*
1102  * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type
1103  * for Ethernet packets with a 4-byte pseudo-header and FCS and
1104  * with the Ethernet header preceded by 7 bytes of preamble and
1105  * 1 byte of SFD, as supplied by their netANALYZER hardware and
1106  * software.
1107  *
1108  * Requested by Holger P. Frommer <HPfrommer@hilscher.com>
1109  */
1110 #define DLT_NETANALYZER_TRANSPARENT	241
1111 
1112 /*
1113  * IP-over-InfiniBand, as specified by RFC 4391.
1114  *
1115  * Requested by Petr Sumbera <petr.sumbera@oracle.com>.
1116  */
1117 #define DLT_IPOIB		242
1118 
1119 /*
1120  * MPEG-2 transport stream (ISO 13818-1/ITU-T H.222.0).
1121  *
1122  * Requested by Guy Martin <gmsoft@tuxicoman.be>.
1123  */
1124 #define DLT_MPEG_2_TS		243
1125 
1126 /*
1127  * ng4T GmbH's UMTS Iub/Iur-over-ATM and Iub/Iur-over-IP format as
1128  * used by their ng40 protocol tester.
1129  *
1130  * Requested by Jens Grimmer <jens.grimmer@ng4t.com>.
1131  */
1132 #define DLT_NG40		244
1133 
1134 /*
1135  * Pseudo-header giving adapter number and flags, followed by an NFC
1136  * (Near-Field Communications) Logical Link Control Protocol (LLCP) PDU,
1137  * as specified by NFC Forum Logical Link Control Protocol Technical
1138  * Specification LLCP 1.1.
1139  *
1140  * Requested by Mike Wakerly <mikey@google.com>.
1141  */
1142 #define DLT_NFC_LLCP		245
1143 
1144 /*
1145  * 246 is used as LINKTYPE_PFSYNC; do not use it for any other purpose.
1146  *
1147  * DLT_PFSYNC has different values on different platforms, and all of
1148  * them collide with something used elsewhere.  On platforms that
1149  * don't already define it, define it as 246.
1150  */
1151 #if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__) && !defined(__DragonFly__) && !defined(__APPLE__)
1152 #define DLT_PFSYNC		246
1153 #endif
1154 
1155 /*
1156  * Raw InfiniBand packets, starting with the Local Routing Header.
1157  *
1158  * Requested by Oren Kladnitsky <orenk@mellanox.com>.
1159  */
1160 #define DLT_INFINIBAND		247
1161 
1162 /*
1163  * SCTP, with no lower-level protocols (i.e., no IPv4 or IPv6).
1164  *
1165  * Requested by Michael Tuexen <Michael.Tuexen@lurchi.franken.de>.
1166  */
1167 #define DLT_SCTP		248
1168 
1169 /*
1170  * USB packets, beginning with a USBPcap header.
1171  *
1172  * Requested by Tomasz Mon <desowin@gmail.com>
1173  */
1174 #define DLT_USBPCAP		249
1175 
1176 /*
1177  * Schweitzer Engineering Laboratories "RTAC" product serial-line
1178  * packets.
1179  *
1180  * Requested by Chris Bontje <chris_bontje@selinc.com>.
1181  */
1182 #define DLT_RTAC_SERIAL		250
1183 
1184 /*
1185  * Bluetooth Low Energy air interface link-layer packets.
1186  *
1187  * Requested by Mike Kershaw <dragorn@kismetwireless.net>.
1188  */
1189 #define DLT_BLUETOOTH_LE_LL	251
1190 
1191 /*
1192  * DLT type for upper-protocol layer PDU saves from wireshark.
1193  *
1194  * the actual contents are determined by two TAGs stored with each
1195  * packet:
1196  *   EXP_PDU_TAG_LINKTYPE          the link type (LINKTYPE_ value) of the
1197  *				   original packet.
1198  *
1199  *   EXP_PDU_TAG_PROTO_NAME        the name of the wireshark dissector
1200  * 				   that can make sense of the data stored.
1201  */
1202 #define DLT_WIRESHARK_UPPER_PDU	252
1203 
1204 /*
1205  * DLT type for the netlink protocol (nlmon devices).
1206  */
1207 #define DLT_NETLINK		253
1208 
1209 /*
1210  * Bluetooth Linux Monitor headers for the BlueZ stack.
1211  */
1212 #define DLT_BLUETOOTH_LINUX_MONITOR	254
1213 
1214 /*
1215  * Bluetooth Basic Rate/Enhanced Data Rate baseband packets, as
1216  * captured by Ubertooth.
1217  */
1218 #define DLT_BLUETOOTH_BREDR_BB	255
1219 
1220 /*
1221  * Bluetooth Low Energy link layer packets, as captured by Ubertooth.
1222  */
1223 #define DLT_BLUETOOTH_LE_LL_WITH_PHDR	256
1224 
1225 /*
1226  * PROFIBUS data link layer.
1227  */
1228 #define DLT_PROFIBUS_DL		257
1229 
1230 /*
1231  * Apple's DLT_PKTAP headers.
1232  *
1233  * Sadly, the folks at Apple either had no clue that the DLT_USERn values
1234  * are for internal use within an organization and partners only, and
1235  * didn't know that the right way to get a link-layer header type is to
1236  * ask tcpdump.org for one, or knew and didn't care, so they just
1237  * used DLT_USER2, which causes problems for everything except for
1238  * their version of tcpdump.
1239  *
1240  * So I'll just give them one; hopefully this will show up in a
1241  * libpcap release in time for them to get this into 10.10 Big Sur
1242  * or whatever Mavericks' successor is called.  LINKTYPE_PKTAP
1243  * will be 258 *even on macOS*; that is *intentional*, so that
1244  * PKTAP files look the same on *all* OSes (different OSes can have
1245  * different numerical values for a given DLT_, but *MUST NOT* have
1246  * different values for what goes in a file, as files can be moved
1247  * between OSes!).
1248  *
1249  * When capturing, on a system with a Darwin-based OS, on a device
1250  * that returns 149 (DLT_USER2 and Apple's DLT_PKTAP) with this
1251  * version of libpcap, the DLT_ value for the pcap_t  will be DLT_PKTAP,
1252  * and that will continue to be DLT_USER2 on Darwin-based OSes. That way,
1253  * binary compatibility with Mavericks is preserved for programs using
1254  * this version of libpcap.  This does mean that if you were using
1255  * DLT_USER2 for some capture device on macOS, you can't do so with
1256  * this version of libpcap, just as you can't with Apple's libpcap -
1257  * on macOS, they define DLT_PKTAP to be DLT_USER2, so programs won't
1258  * be able to distinguish between PKTAP and whatever you were using
1259  * DLT_USER2 for.
1260  *
1261  * If the program saves the capture to a file using this version of
1262  * libpcap's pcap_dump code, the LINKTYPE_ value in the file will be
1263  * LINKTYPE_PKTAP, which will be 258, even on Darwin-based OSes.
1264  * That way, the file will *not* be a DLT_USER2 file.  That means
1265  * that the latest version of tcpdump, when built with this version
1266  * of libpcap, and sufficiently recent versions of Wireshark will
1267  * be able to read those files and interpret them correctly; however,
1268  * Apple's version of tcpdump in OS X 10.9 won't be able to handle
1269  * them.  (Hopefully, Apple will pick up this version of libpcap,
1270  * and the corresponding version of tcpdump, so that tcpdump will
1271  * be able to handle the old LINKTYPE_USER2 captures *and* the new
1272  * LINKTYPE_PKTAP captures.)
1273  */
1274 #ifdef __APPLE__
1275 #define DLT_PKTAP	DLT_USER2
1276 #else
1277 #define DLT_PKTAP	258
1278 #endif
1279 
1280 /*
1281  * Ethernet packets preceded by a header giving the last 6 octets
1282  * of the preamble specified by 802.3-2012 Clause 65, section
1283  * 65.1.3.2 "Transmit".
1284  */
1285 #define DLT_EPON	259
1286 
1287 /*
1288  * IPMI trace packets, as specified by Table 3-20 "Trace Data Block Format"
1289  * in the PICMG HPM.2 specification.
1290  */
1291 #define DLT_IPMI_HPM_2	260
1292 
1293 /*
1294  * per  Joshua Wright <jwright@hasborg.com>, formats for Zwave captures.
1295  */
1296 #define DLT_ZWAVE_R1_R2  261
1297 #define DLT_ZWAVE_R3     262
1298 
1299 /*
1300  * per Steve Karg <skarg@users.sourceforge.net>, formats for Wattstopper
1301  * Digital Lighting Management room bus serial protocol captures.
1302  */
1303 #define DLT_WATTSTOPPER_DLM     263
1304 
1305 /*
1306  * ISO 14443 contactless smart card messages.
1307  */
1308 #define DLT_ISO_14443	264
1309 
1310 /*
1311  * Radio data system (RDS) groups.  IEC 62106.
1312  * Per Jonathan Brucker <jonathan.brucke@gmail.com>.
1313  */
1314 #define DLT_RDS		265
1315 
1316 /*
1317  * USB packets, beginning with a Darwin (macOS, etc.) header.
1318  */
1319 #define DLT_USB_DARWIN	266
1320 
1321 /*
1322  * OpenBSD DLT_OPENFLOW.
1323  */
1324 #define DLT_OPENFLOW	267
1325 
1326 /*
1327  * SDLC frames containing SNA PDUs.
1328  */
1329 #define DLT_SDLC	268
1330 
1331 /*
1332  * per "Selvig, Bjorn" <b.selvig@ti.com> used for
1333  * TI protocol sniffer.
1334  */
1335 #define DLT_TI_LLN_SNIFFER	269
1336 
1337 /*
1338  * per: Erik de Jong <erikdejong at gmail.com> for
1339  *   https://github.com/eriknl/LoRaTap/releases/tag/v0.1
1340  */
1341 #define DLT_LORATAP             270
1342 
1343 /*
1344  * per: Stefanha at gmail.com for
1345  *   http://lists.sandelman.ca/pipermail/tcpdump-workers/2017-May/000772.html
1346  * and: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/vsockmon.h
1347  * for: http://qemu-project.org/Features/VirtioVsock
1348  */
1349 #define DLT_VSOCK               271
1350 
1351 /*
1352  * Nordic Semiconductor Bluetooth LE sniffer.
1353  */
1354 #define DLT_NORDIC_BLE		272
1355 
1356 /*
1357  * Excentis DOCSIS 3.1 RF sniffer (XRA-31)
1358  *   per: bruno.verstuyft at excentis.com
1359  *        http://www.xra31.com/xra-header
1360  */
1361 #define DLT_DOCSIS31_XRA31	273
1362 
1363 /*
1364  * mPackets, as specified by IEEE 802.3br Figure 99-4, starting
1365  * with the preamble and always ending with a CRC field.
1366  */
1367 #define DLT_ETHERNET_MPACKET	274
1368 
1369 /*
1370  * DisplayPort AUX channel monitoring data as specified by VESA
1371  * DisplayPort(DP) Standard preceeded by a pseudo-header.
1372  *    per dirk.eibach at gdsys.cc
1373  */
1374 #define DLT_DISPLAYPORT_AUX	275
1375 
1376 /*
1377  * Linux cooked sockets v2.
1378  */
1379 #define DLT_LINUX_SLL2	276
1380 
1381 /*
1382  * In case the code that includes this file (directly or indirectly)
1383  * has also included OS files that happen to define DLT_MATCHING_MAX,
1384  * with a different value (perhaps because that OS hasn't picked up
1385  * the latest version of our DLT definitions), we undefine the
1386  * previous value of DLT_MATCHING_MAX.
1387  */
1388 #ifdef DLT_MATCHING_MAX
1389 #undef DLT_MATCHING_MAX
1390 #endif
1391 #define DLT_MATCHING_MAX	276	/* highest value in the "matching" range */
1392 
1393 /*
1394  * DLT and savefile link type values are split into a class and
1395  * a member of that class.  A class value of 0 indicates a regular
1396  * DLT_/LINKTYPE_ value.
1397  */
1398 #define DLT_CLASS(x)		((x) & 0x03ff0000)
1399 
1400 /*
1401  * NetBSD-specific generic "raw" link type.  The class value indicates
1402  * that this is the generic raw type, and the lower 16 bits are the
1403  * address family we're dealing with.  Those values are NetBSD-specific;
1404  * do not assume that they correspond to AF_ values for your operating
1405  * system.
1406  */
1407 #define	DLT_CLASS_NETBSD_RAWAF	0x02240000
1408 #define	DLT_NETBSD_RAWAF(af)	(DLT_CLASS_NETBSD_RAWAF | (af))
1409 #define	DLT_NETBSD_RAWAF_AF(x)	((x) & 0x0000ffff)
1410 #define	DLT_IS_NETBSD_RAWAF(x)	(DLT_CLASS(x) == DLT_CLASS_NETBSD_RAWAF)
1411 
1412 #endif /* !_NET_DLT_H_ */
1413