1 /* $NetBSD: pcap-common.c,v 1.7 2019/10/01 16:02:12 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions 9 * retain the above copyright notice and this paragraph in its entirety, (2) 10 * distributions including binary code include the above copyright notice and 11 * this paragraph in its entirety in the documentation or other materials 12 * provided with the distribution, and (3) all advertising materials mentioning 13 * features or use of this software display the following acknowledgement: 14 * ``This product includes software developed by the University of California, 15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 16 * the University nor the names of its contributors may be used to endorse 17 * or promote products derived from this software without specific prior 18 * written permission. 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 22 * 23 * pcap-common.c - common code for pcap and pcapng files 24 */ 25 26 #include <sys/cdefs.h> 27 __RCSID("$NetBSD: pcap-common.c,v 1.7 2019/10/01 16:02:12 christos Exp $"); 28 29 #ifdef HAVE_CONFIG_H 30 #include <config.h> 31 #endif 32 33 #include <pcap-types.h> 34 35 #include "pcap-int.h" 36 #include "extract.h" 37 #include "pcap/sll.h" 38 #include "pcap/usb.h" 39 #include "pcap/nflog.h" 40 #include "pcap/can_socketcan.h" 41 42 #include "pcap-common.h" 43 44 /* 45 * We don't write DLT_* values to capture files, because they're not the 46 * same on all platforms. 47 * 48 * Unfortunately, the various flavors of BSD have not always used the same 49 * numerical values for the same data types, and various patches to 50 * libpcap for non-BSD OSes have added their own DLT_* codes for link 51 * layer encapsulation types seen on those OSes, and those codes have had, 52 * in some cases, values that were also used, on other platforms, for other 53 * link layer encapsulation types. 54 * 55 * This means that capture files of a type whose numerical DLT_* code 56 * means different things on different BSDs, or with different versions 57 * of libpcap, can't always be read on systems other than those like 58 * the one running on the machine on which the capture was made. 59 * 60 * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes 61 * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_* 62 * codes to DLT_* codes when reading a savefile header. 63 * 64 * For those DLT_* codes that have, as far as we know, the same values on 65 * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as 66 * DLT_xxx; that way, captures of those types can still be read by 67 * versions of libpcap that map LINKTYPE_* values to DLT_* values, and 68 * captures of those types written by versions of libpcap that map DLT_ 69 * values to LINKTYPE_ values can still be read by older versions 70 * of libpcap. 71 * 72 * The other LINKTYPE_* codes are given values starting at 100, in the 73 * hopes that no DLT_* code will be given one of those values. 74 * 75 * In order to ensure that a given LINKTYPE_* code's value will refer to 76 * the same encapsulation type on all platforms, you should not allocate 77 * a new LINKTYPE_* value without consulting 78 * "tcpdump-workers@lists.tcpdump.org". The tcpdump developers will 79 * allocate a value for you, and will not subsequently allocate it to 80 * anybody else; that value will be added to the "pcap.h" in the 81 * tcpdump.org Git repository, so that a future libpcap release will 82 * include it. 83 * 84 * You should, if possible, also contribute patches to libpcap and tcpdump 85 * to handle the new encapsulation type, so that they can also be checked 86 * into the tcpdump.org Git repository and so that they will appear in 87 * future libpcap and tcpdump releases. 88 * 89 * Do *NOT* assume that any values after the largest value in this file 90 * are available; you might not have the most up-to-date version of this 91 * file, and new values after that one might have been assigned. Also, 92 * do *NOT* use any values below 100 - those might already have been 93 * taken by one (or more!) organizations. 94 * 95 * Any platform that defines additional DLT_* codes should: 96 * 97 * request a LINKTYPE_* code and value from tcpdump.org, 98 * as per the above; 99 * 100 * add, in their version of libpcap, an entry to map 101 * those DLT_* codes to the corresponding LINKTYPE_* 102 * code; 103 * 104 * redefine, in their "net/bpf.h", any DLT_* values 105 * that collide with the values used by their additional 106 * DLT_* codes, to remove those collisions (but without 107 * making them collide with any of the LINKTYPE_* 108 * values equal to 50 or above; they should also avoid 109 * defining DLT_* values that collide with those 110 * LINKTYPE_* values, either). 111 */ 112 #define LINKTYPE_NULL DLT_NULL 113 #define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */ 114 #define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */ 115 #define LINKTYPE_AX25 DLT_AX25 116 #define LINKTYPE_PRONET DLT_PRONET 117 #define LINKTYPE_CHAOS DLT_CHAOS 118 #define LINKTYPE_IEEE802_5 DLT_IEEE802 /* DLT_IEEE802 is used for 802.5 Token Ring */ 119 #define LINKTYPE_ARCNET_BSD DLT_ARCNET /* BSD-style headers */ 120 #define LINKTYPE_SLIP DLT_SLIP 121 #define LINKTYPE_PPP DLT_PPP 122 #define LINKTYPE_FDDI DLT_FDDI 123 124 /* 125 * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662 126 * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol 127 * field) at the beginning of the packet. 128 * 129 * This is for use when there is always such a header; the address field 130 * might be 0xff, for regular PPP, or it might be an address field for Cisco 131 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco 132 * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL. 133 * 134 * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that 135 * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL 136 * captures will be written out with a link type that NetBSD's tcpdump 137 * can read. 138 */ 139 #define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */ 140 141 #define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */ 142 143 #define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */ 144 145 /* 146 * These correspond to DLT_s that have different values on different 147 * platforms; we map between these values in capture files and 148 * the DLT_ values as returned by pcap_datalink() and passed to 149 * pcap_open_dead(). 150 */ 151 #define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */ 152 #define LINKTYPE_RAW 101 /* raw IP */ 153 #define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */ 154 #define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */ 155 156 /* 157 * Values starting with 104 are used for newly-assigned link-layer 158 * header type values; for those link-layer header types, the DLT_ 159 * value returned by pcap_datalink() and passed to pcap_open_dead(), 160 * and the LINKTYPE_ value that appears in capture files, are the 161 * same. 162 * 163 * LINKTYPE_MATCHING_MIN is the lowest such value; LINKTYPE_MATCHING_MAX 164 * is the highest such value. 165 */ 166 #define LINKTYPE_MATCHING_MIN 104 /* lowest value in the "matching" range */ 167 168 #define LINKTYPE_C_HDLC 104 /* Cisco HDLC */ 169 #define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */ 170 #define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */ 171 #define LINKTYPE_FRELAY 107 /* Frame Relay */ 172 #define LINKTYPE_LOOP 108 /* OpenBSD loopback */ 173 #define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */ 174 175 /* 176 * These three types are reserved for future use. 177 */ 178 #define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */ 179 #define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */ 180 #define LINKTYPE_HDLC 112 /* NetBSD HDLC framing */ 181 182 #define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */ 183 #define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */ 184 #define LINKTYPE_ECONET 115 /* Acorn Econet */ 185 186 /* 187 * Reserved for use with OpenBSD ipfilter. 188 */ 189 #define LINKTYPE_IPFILTER 116 190 191 #define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */ 192 #define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */ 193 #define LINKTYPE_IEEE802_11_PRISM 119 /* 802.11 plus Prism II monitor mode radio metadata header */ 194 #define LINKTYPE_IEEE802_11_AIRONET 120 /* 802.11 plus FreeBSD Aironet driver radio metadata header */ 195 196 /* 197 * Reserved for Siemens HiPath HDLC. 198 */ 199 #define LINKTYPE_HHDLC 121 200 201 #define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */ 202 #define LINKTYPE_SUNATM 123 /* Solaris+SunATM */ 203 204 /* 205 * Reserved as per request from Kent Dahlgren <kent@praesum.com> 206 * for private use. 207 */ 208 #define LINKTYPE_RIO 124 /* RapidIO */ 209 #define LINKTYPE_PCI_EXP 125 /* PCI Express */ 210 #define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */ 211 212 #define LINKTYPE_IEEE802_11_RADIOTAP 127 /* 802.11 plus radiotap radio metadata header */ 213 214 /* 215 * Reserved for the TZSP encapsulation, as per request from 216 * Chris Waters <chris.waters@networkchemistry.com> 217 * TZSP is a generic encapsulation for any other link type, 218 * which includes a means to include meta-information 219 * with the packet, e.g. signal strength and channel 220 * for 802.11 packets. 221 */ 222 #define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */ 223 224 #define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */ 225 226 /* 227 * Juniper-private data link types, as per request from 228 * Hannes Gredler <hannes@juniper.net>. The corresponding 229 * DLT_s are used for passing on chassis-internal 230 * metainformation such as QOS profiles, etc.. 231 */ 232 #define LINKTYPE_JUNIPER_MLPPP 130 233 #define LINKTYPE_JUNIPER_MLFR 131 234 #define LINKTYPE_JUNIPER_ES 132 235 #define LINKTYPE_JUNIPER_GGSN 133 236 #define LINKTYPE_JUNIPER_MFR 134 237 #define LINKTYPE_JUNIPER_ATM2 135 238 #define LINKTYPE_JUNIPER_SERVICES 136 239 #define LINKTYPE_JUNIPER_ATM1 137 240 241 #define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */ 242 243 #define LINKTYPE_MTP2_WITH_PHDR 139 244 #define LINKTYPE_MTP2 140 245 #define LINKTYPE_MTP3 141 246 #define LINKTYPE_SCCP 142 247 248 #define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */ 249 250 #define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */ 251 252 /* 253 * Reserved for IBM SP switch and IBM Next Federation switch. 254 */ 255 #define LINKTYPE_IBM_SP 145 256 #define LINKTYPE_IBM_SN 146 257 258 /* 259 * Reserved for private use. If you have some link-layer header type 260 * that you want to use within your organization, with the capture files 261 * using that link-layer header type not ever be sent outside your 262 * organization, you can use these values. 263 * 264 * No libpcap release will use these for any purpose, nor will any 265 * tcpdump release use them, either. 266 * 267 * Do *NOT* use these in capture files that you expect anybody not using 268 * your private versions of capture-file-reading tools to read; in 269 * particular, do *NOT* use them in products, otherwise you may find that 270 * people won't be able to use tcpdump, or snort, or Ethereal, or... to 271 * read capture files from your firewall/intrusion detection/traffic 272 * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value, 273 * and you may also find that the developers of those applications will 274 * not accept patches to let them read those files. 275 * 276 * Also, do not use them if somebody might send you a capture using them 277 * for *their* private type and tools using them for *your* private type 278 * would have to read them. 279 * 280 * Instead, in those cases, ask "tcpdump-workers@lists.tcpdump.org" for a 281 * new DLT_ and LINKTYPE_ value, as per the comment in pcap/bpf.h, and use 282 * the type you're given. 283 */ 284 #define LINKTYPE_USER0 147 285 #define LINKTYPE_USER1 148 286 #define LINKTYPE_USER2 149 287 #define LINKTYPE_USER3 150 288 #define LINKTYPE_USER4 151 289 #define LINKTYPE_USER5 152 290 #define LINKTYPE_USER6 153 291 #define LINKTYPE_USER7 154 292 #define LINKTYPE_USER8 155 293 #define LINKTYPE_USER9 156 294 #define LINKTYPE_USER10 157 295 #define LINKTYPE_USER11 158 296 #define LINKTYPE_USER12 159 297 #define LINKTYPE_USER13 160 298 #define LINKTYPE_USER14 161 299 #define LINKTYPE_USER15 162 300 301 /* 302 * For future use with 802.11 captures - defined by AbsoluteValue 303 * Systems to store a number of bits of link-layer information 304 * including radio information: 305 * 306 * http://www.shaftnet.org/~pizza/software/capturefrm.txt 307 */ 308 #define LINKTYPE_IEEE802_11_AVS 163 /* 802.11 plus AVS radio metadata header */ 309 310 /* 311 * Juniper-private data link type, as per request from 312 * Hannes Gredler <hannes@juniper.net>. The corresponding 313 * DLT_s are used for passing on chassis-internal 314 * metainformation such as QOS profiles, etc.. 315 */ 316 #define LINKTYPE_JUNIPER_MONITOR 164 317 318 /* 319 * BACnet MS/TP frames. 320 */ 321 #define LINKTYPE_BACNET_MS_TP 165 322 323 /* 324 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>. 325 * 326 * This is used in some OSes to allow a kernel socket filter to distinguish 327 * between incoming and outgoing packets, on a socket intended to 328 * supply pppd with outgoing packets so it can do dial-on-demand and 329 * hangup-on-lack-of-demand; incoming packets are filtered out so they 330 * don't cause pppd to hold the connection up (you don't want random 331 * input packets such as port scans, packets from old lost connections, 332 * etc. to force the connection to stay up). 333 * 334 * The first byte of the PPP header (0xff03) is modified to accomodate 335 * the direction - 0x00 = IN, 0x01 = OUT. 336 */ 337 #define LINKTYPE_PPP_PPPD 166 338 339 /* 340 * Juniper-private data link type, as per request from 341 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used 342 * for passing on chassis-internal metainformation such as 343 * QOS profiles, cookies, etc.. 344 */ 345 #define LINKTYPE_JUNIPER_PPPOE 167 346 #define LINKTYPE_JUNIPER_PPPOE_ATM 168 347 348 #define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */ 349 #define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */ 350 #define LINKTYPE_GPF_F 171 /* GPF-F (ITU-T G.7041/Y.1303) */ 351 352 /* 353 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line 354 * monitoring equipment. 355 */ 356 #define LINKTYPE_GCOM_T1E1 172 357 #define LINKTYPE_GCOM_SERIAL 173 358 359 /* 360 * Juniper-private data link type, as per request from 361 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used 362 * for internal communication to Physical Interface Cards (PIC) 363 */ 364 #define LINKTYPE_JUNIPER_PIC_PEER 174 365 366 /* 367 * Link types requested by Gregor Maier <gregor@endace.com> of Endace 368 * Measurement Systems. They add an ERF header (see 369 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of 370 * the link-layer header. 371 */ 372 #define LINKTYPE_ERF_ETH 175 /* Ethernet */ 373 #define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */ 374 375 /* 376 * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD 377 * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header 378 * includes additional information before the LAPD header, so it's 379 * not necessarily a generic LAPD header. 380 */ 381 #define LINKTYPE_LINUX_LAPD 177 382 383 /* 384 * Juniper-private data link type, as per request from 385 * Hannes Gredler <hannes@juniper.net>. 386 * The Link Types are used for prepending meta-information 387 * like interface index, interface name 388 * before standard Ethernet, PPP, Frelay & C-HDLC Frames 389 */ 390 #define LINKTYPE_JUNIPER_ETHER 178 391 #define LINKTYPE_JUNIPER_PPP 179 392 #define LINKTYPE_JUNIPER_FRELAY 180 393 #define LINKTYPE_JUNIPER_CHDLC 181 394 395 /* 396 * Multi Link Frame Relay (FRF.16) 397 */ 398 #define LINKTYPE_MFR 182 399 400 /* 401 * Juniper-private data link type, as per request from 402 * Hannes Gredler <hannes@juniper.net>. 403 * The DLT_ is used for internal communication with a 404 * voice Adapter Card (PIC) 405 */ 406 #define LINKTYPE_JUNIPER_VP 183 407 408 /* 409 * Arinc 429 frames. 410 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 411 * Every frame contains a 32bit A429 label. 412 * More documentation on Arinc 429 can be found at 413 * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf 414 */ 415 #define LINKTYPE_A429 184 416 417 /* 418 * Arinc 653 Interpartition Communication messages. 419 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 420 * Please refer to the A653-1 standard for more information. 421 */ 422 #define LINKTYPE_A653_ICM 185 423 424 /* 425 * This used to be "USB packets, beginning with a USB setup header; 426 * requested by Paolo Abeni <paolo.abeni@email.it>." 427 * 428 * However, that header didn't work all that well - it left out some 429 * useful information - and was abandoned in favor of the DLT_USB_LINUX 430 * header. 431 * 432 * This is now used by FreeBSD for its BPF taps for USB; that has its 433 * own headers. So it is written, so it is done. 434 */ 435 #define LINKTYPE_USB_FREEBSD 186 436 437 /* 438 * Bluetooth HCI UART transport layer (part H:4); requested by 439 * Paolo Abeni. 440 */ 441 #define LINKTYPE_BLUETOOTH_HCI_H4 187 442 443 /* 444 * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz 445 * <cruz_petagay@bah.com>. 446 */ 447 #define LINKTYPE_IEEE802_16_MAC_CPS 188 448 449 /* 450 * USB packets, beginning with a Linux USB header; requested by 451 * Paolo Abeni <paolo.abeni@email.it>. 452 */ 453 #define LINKTYPE_USB_LINUX 189 454 455 /* 456 * Controller Area Network (CAN) v. 2.0B packets. 457 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 458 * Used to dump CAN packets coming from a CAN Vector board. 459 * More documentation on the CAN v2.0B frames can be found at 460 * http://www.can-cia.org/downloads/?269 461 */ 462 #define LINKTYPE_CAN20B 190 463 464 /* 465 * IEEE 802.15.4, with address fields padded, as is done by Linux 466 * drivers; requested by Juergen Schimmer. 467 */ 468 #define LINKTYPE_IEEE802_15_4_LINUX 191 469 470 /* 471 * Per Packet Information encapsulated packets. 472 * LINKTYPE_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 473 */ 474 #define LINKTYPE_PPI 192 475 476 /* 477 * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header; 478 * requested by Charles Clancy. 479 */ 480 #define LINKTYPE_IEEE802_16_MAC_CPS_RADIO 193 481 482 /* 483 * Juniper-private data link type, as per request from 484 * Hannes Gredler <hannes@juniper.net>. 485 * The DLT_ is used for internal communication with a 486 * integrated service module (ISM). 487 */ 488 #define LINKTYPE_JUNIPER_ISM 194 489 490 /* 491 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 492 * nothing), and with the FCS at the end of the frame; requested by 493 * Mikko Saarnivala <mikko.saarnivala@sensinode.com>. 494 * 495 * This should only be used if the FCS is present at the end of the 496 * frame; if the frame has no FCS, DLT_IEEE802_15_4_NOFCS should be 497 * used. 498 */ 499 #define LINKTYPE_IEEE802_15_4_WITHFCS 195 500 501 /* 502 * Various link-layer types, with a pseudo-header, for SITA 503 * (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com). 504 */ 505 #define LINKTYPE_SITA 196 506 507 /* 508 * Various link-layer types, with a pseudo-header, for Endace DAG cards; 509 * encapsulates Endace ERF records. Requested by Stephen Donnelly 510 * <stephen@endace.com>. 511 */ 512 #define LINKTYPE_ERF 197 513 514 /* 515 * Special header prepended to Ethernet packets when capturing from a 516 * u10 Networks board. Requested by Phil Mulholland 517 * <phil@u10networks.com>. 518 */ 519 #define LINKTYPE_RAIF1 198 520 521 /* 522 * IPMB packet for IPMI, beginning with a 2-byte header, followed by 523 * the I2C slave address, followed by the netFn and LUN, etc.. 524 * Requested by Chanthy Toeung <chanthy.toeung@ca.kontron.com>. 525 * 526 * XXX - its DLT_ value used to be called DLT_IPMB, back when we got the 527 * impression from the email thread requesting it that the packet 528 * had no extra 2-byte header. We've renamed it; if anybody used 529 * DLT_IPMB and assumed no 2-byte header, this will cause the compile 530 * to fail, at which point we'll have to figure out what to do about 531 * the two header types using the same DLT_/LINKTYPE_ value. If that 532 * doesn't happen, we'll assume nobody used it and that the redefinition 533 * is safe. 534 */ 535 #define LINKTYPE_IPMB_KONTRON 199 536 537 /* 538 * Juniper-private data link type, as per request from 539 * Hannes Gredler <hannes@juniper.net>. 540 * The DLT_ is used for capturing data on a secure tunnel interface. 541 */ 542 #define LINKTYPE_JUNIPER_ST 200 543 544 /* 545 * Bluetooth HCI UART transport layer (part H:4), with pseudo-header 546 * that includes direction information; requested by Paolo Abeni. 547 */ 548 #define LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR 201 549 550 /* 551 * AX.25 packet with a 1-byte KISS header; see 552 * 553 * http://www.ax25.net/kiss.htm 554 * 555 * as per Richard Stearn <richard@rns-stearn.demon.co.uk>. 556 */ 557 #define LINKTYPE_AX25_KISS 202 558 559 /* 560 * LAPD packets from an ISDN channel, starting with the address field, 561 * with no pseudo-header. 562 * Requested by Varuna De Silva <varunax@gmail.com>. 563 */ 564 #define LINKTYPE_LAPD 203 565 566 567 /* 568 * PPP, with a one-byte direction pseudo-header prepended - zero means 569 * "received by this host", non-zero (any non-zero value) means "sent by 570 * this host" - as per Will Barker <w.barker@zen.co.uk>. 571 */ 572 #define LINKTYPE_PPP_WITH_DIR 204 /* Don't confuse with LINKTYPE_PPP_PPPD */ 573 574 /* 575 * Cisco HDLC, with a one-byte direction pseudo-header prepended - zero 576 * means "received by this host", non-zero (any non-zero value) means 577 * "sent by this host" - as per Will Barker <w.barker@zen.co.uk>. 578 */ 579 #define LINKTYPE_C_HDLC_WITH_DIR 205 /* Cisco HDLC */ 580 581 /* 582 * Frame Relay, with a one-byte direction pseudo-header prepended - zero 583 * means "received by this host" (DCE -> DTE), non-zero (any non-zero 584 * value) means "sent by this host" (DTE -> DCE) - as per Will Barker 585 * <w.barker@zen.co.uk>. 586 */ 587 #define LINKTYPE_FRELAY_WITH_DIR 206 /* Frame Relay */ 588 589 /* 590 * LAPB, with a one-byte direction pseudo-header prepended - zero means 591 * "received by this host" (DCE -> DTE), non-zero (any non-zero value) 592 * means "sent by this host" (DTE -> DCE)- as per Will Barker 593 * <w.barker@zen.co.uk>. 594 */ 595 #define LINKTYPE_LAPB_WITH_DIR 207 /* LAPB */ 596 597 /* 598 * 208 is reserved for an as-yet-unspecified proprietary link-layer 599 * type, as requested by Will Barker. 600 */ 601 602 /* 603 * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman 604 * <avn@pigeonpoint.com>. 605 */ 606 #define LINKTYPE_IPMB_LINUX 209 607 608 /* 609 * FlexRay automotive bus - http://www.flexray.com/ - as requested 610 * by Hannes Kaelber <hannes.kaelber@x2e.de>. 611 */ 612 #define LINKTYPE_FLEXRAY 210 613 614 /* 615 * Media Oriented Systems Transport (MOST) bus for multimedia 616 * transport - http://www.mostcooperation.com/ - as requested 617 * by Hannes Kaelber <hannes.kaelber@x2e.de>. 618 */ 619 #define LINKTYPE_MOST 211 620 621 /* 622 * Local Interconnect Network (LIN) bus for vehicle networks - 623 * http://www.lin-subbus.org/ - as requested by Hannes Kaelber 624 * <hannes.kaelber@x2e.de>. 625 */ 626 #define LINKTYPE_LIN 212 627 628 /* 629 * X2E-private data link type used for serial line capture, 630 * as requested by Hannes Kaelber <hannes.kaelber@x2e.de>. 631 */ 632 #define LINKTYPE_X2E_SERIAL 213 633 634 /* 635 * X2E-private data link type used for the Xoraya data logger 636 * family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>. 637 */ 638 #define LINKTYPE_X2E_XORAYA 214 639 640 /* 641 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 642 * nothing), but with the PHY-level data for non-ASK PHYs (4 octets 643 * of 0 as preamble, one octet of SFD, one octet of frame length+ 644 * reserved bit, and then the MAC-layer data, starting with the 645 * frame control field). 646 * 647 * Requested by Max Filippov <jcmvbkbc@gmail.com>. 648 */ 649 #define LINKTYPE_IEEE802_15_4_NONASK_PHY 215 650 651 /* 652 * David Gibson <david@gibson.dropbear.id.au> requested this for 653 * captures from the Linux kernel /dev/input/eventN devices. This 654 * is used to communicate keystrokes and mouse movements from the 655 * Linux kernel to display systems, such as Xorg. 656 */ 657 #define LINKTYPE_LINUX_EVDEV 216 658 659 /* 660 * GSM Um and Abis interfaces, preceded by a "gsmtap" header. 661 * 662 * Requested by Harald Welte <laforge@gnumonks.org>. 663 */ 664 #define LINKTYPE_GSMTAP_UM 217 665 #define LINKTYPE_GSMTAP_ABIS 218 666 667 /* 668 * MPLS, with an MPLS label as the link-layer header. 669 * Requested by Michele Marchetto <michele@openbsd.org> on behalf 670 * of OpenBSD. 671 */ 672 #define LINKTYPE_MPLS 219 673 674 /* 675 * USB packets, beginning with a Linux USB header, with the USB header 676 * padded to 64 bytes; required for memory-mapped access. 677 */ 678 #define LINKTYPE_USB_LINUX_MMAPPED 220 679 680 /* 681 * DECT packets, with a pseudo-header; requested by 682 * Matthias Wenzel <tcpdump@mazzoo.de>. 683 */ 684 #define LINKTYPE_DECT 221 685 686 /* 687 * From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1@nasa.gov> 688 * Date: Mon, 11 May 2009 11:18:30 -0500 689 * 690 * DLT_AOS. We need it for AOS Space Data Link Protocol. 691 * I have already written dissectors for but need an OK from 692 * legal before I can submit a patch. 693 * 694 */ 695 #define LINKTYPE_AOS 222 696 697 /* 698 * Wireless HART (Highway Addressable Remote Transducer) 699 * From the HART Communication Foundation 700 * IES/PAS 62591 701 * 702 * Requested by Sam Roberts <vieuxtech@gmail.com>. 703 */ 704 #define LINKTYPE_WIHART 223 705 706 /* 707 * Fibre Channel FC-2 frames, beginning with a Frame_Header. 708 * Requested by Kahou Lei <kahou82@gmail.com>. 709 */ 710 #define LINKTYPE_FC_2 224 711 712 /* 713 * Fibre Channel FC-2 frames, beginning with an encoding of the 714 * SOF, and ending with an encoding of the EOF. 715 * 716 * The encodings represent the frame delimiters as 4-byte sequences 717 * representing the corresponding ordered sets, with K28.5 718 * represented as 0xBC, and the D symbols as the corresponding 719 * byte values; for example, SOFi2, which is K28.5 - D21.5 - D1.2 - D21.2, 720 * is represented as 0xBC 0xB5 0x55 0x55. 721 * 722 * Requested by Kahou Lei <kahou82@gmail.com>. 723 */ 724 #define LINKTYPE_FC_2_WITH_FRAME_DELIMS 225 725 726 /* 727 * Solaris ipnet pseudo-header; requested by Darren Reed <Darren.Reed@Sun.COM>. 728 * 729 * The pseudo-header starts with a one-byte version number; for version 2, 730 * the pseudo-header is: 731 * 732 * struct dl_ipnetinfo { 733 * uint8_t dli_version; 734 * uint8_t dli_family; 735 * uint16_t dli_htype; 736 * uint32_t dli_pktlen; 737 * uint32_t dli_ifindex; 738 * uint32_t dli_grifindex; 739 * uint32_t dli_zsrc; 740 * uint32_t dli_zdst; 741 * }; 742 * 743 * dli_version is 2 for the current version of the pseudo-header. 744 * 745 * dli_family is a Solaris address family value, so it's 2 for IPv4 746 * and 26 for IPv6. 747 * 748 * dli_htype is a "hook type" - 0 for incoming packets, 1 for outgoing 749 * packets, and 2 for packets arriving from another zone on the same 750 * machine. 751 * 752 * dli_pktlen is the length of the packet data following the pseudo-header 753 * (so the captured length minus dli_pktlen is the length of the 754 * pseudo-header, assuming the entire pseudo-header was captured). 755 * 756 * dli_ifindex is the interface index of the interface on which the 757 * packet arrived. 758 * 759 * dli_grifindex is the group interface index number (for IPMP interfaces). 760 * 761 * dli_zsrc is the zone identifier for the source of the packet. 762 * 763 * dli_zdst is the zone identifier for the destination of the packet. 764 * 765 * A zone number of 0 is the global zone; a zone number of 0xffffffff 766 * means that the packet arrived from another host on the network, not 767 * from another zone on the same machine. 768 * 769 * An IPv4 or IPv6 datagram follows the pseudo-header; dli_family indicates 770 * which of those it is. 771 */ 772 #define LINKTYPE_IPNET 226 773 774 /* 775 * CAN (Controller Area Network) frames, with a pseudo-header as supplied 776 * by Linux SocketCAN, and with multi-byte numerical fields in that header 777 * in big-endian byte order. 778 * 779 * See Documentation/networking/can.txt in the Linux source. 780 * 781 * Requested by Felix Obenhuber <felix@obenhuber.de>. 782 */ 783 #define LINKTYPE_CAN_SOCKETCAN 227 784 785 /* 786 * Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies 787 * whether it's v4 or v6. Requested by Darren Reed <Darren.Reed@Sun.COM>. 788 */ 789 #define LINKTYPE_IPV4 228 790 #define LINKTYPE_IPV6 229 791 792 /* 793 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 794 * nothing), and with no FCS at the end of the frame; requested by 795 * Jon Smirl <jonsmirl@gmail.com>. 796 */ 797 #define LINKTYPE_IEEE802_15_4_NOFCS 230 798 799 /* 800 * Raw D-Bus: 801 * 802 * http://www.freedesktop.org/wiki/Software/dbus 803 * 804 * messages: 805 * 806 * http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages 807 * 808 * starting with the endianness flag, followed by the message type, etc., 809 * but without the authentication handshake before the message sequence: 810 * 811 * http://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol 812 * 813 * Requested by Martin Vidner <martin@vidner.net>. 814 */ 815 #define LINKTYPE_DBUS 231 816 817 /* 818 * Juniper-private data link type, as per request from 819 * Hannes Gredler <hannes@juniper.net>. 820 */ 821 #define LINKTYPE_JUNIPER_VS 232 822 #define LINKTYPE_JUNIPER_SRX_E2E 233 823 #define LINKTYPE_JUNIPER_FIBRECHANNEL 234 824 825 /* 826 * DVB-CI (DVB Common Interface for communication between a PC Card 827 * module and a DVB receiver). See 828 * 829 * http://www.kaiser.cx/pcap-dvbci.html 830 * 831 * for the specification. 832 * 833 * Requested by Martin Kaiser <martin@kaiser.cx>. 834 */ 835 #define LINKTYPE_DVB_CI 235 836 837 /* 838 * Variant of 3GPP TS 27.010 multiplexing protocol. Requested 839 * by Hans-Christoph Schemmel <hans-christoph.schemmel@cinterion.com>. 840 */ 841 #define LINKTYPE_MUX27010 236 842 843 /* 844 * STANAG 5066 D_PDUs. Requested by M. Baris Demiray 845 * <barisdemiray@gmail.com>. 846 */ 847 #define LINKTYPE_STANAG_5066_D_PDU 237 848 849 /* 850 * Juniper-private data link type, as per request from 851 * Hannes Gredler <hannes@juniper.net>. 852 */ 853 #define LINKTYPE_JUNIPER_ATM_CEMIC 238 854 855 /* 856 * NetFilter LOG messages 857 * (payload of netlink NFNL_SUBSYS_ULOG/NFULNL_MSG_PACKET packets) 858 * 859 * Requested by Jakub Zawadzki <darkjames-ws@darkjames.pl> 860 */ 861 #define LINKTYPE_NFLOG 239 862 863 /* 864 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type 865 * for Ethernet packets with a 4-byte pseudo-header and always 866 * with the payload including the FCS, as supplied by their 867 * netANALYZER hardware and software. 868 * 869 * Requested by Holger P. Frommer <HPfrommer@hilscher.com> 870 */ 871 #define LINKTYPE_NETANALYZER 240 872 873 /* 874 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type 875 * for Ethernet packets with a 4-byte pseudo-header and FCS and 876 * 1 byte of SFD, as supplied by their netANALYZER hardware and 877 * software. 878 * 879 * Requested by Holger P. Frommer <HPfrommer@hilscher.com> 880 */ 881 #define LINKTYPE_NETANALYZER_TRANSPARENT 241 882 883 /* 884 * IP-over-InfiniBand, as specified by RFC 4391. 885 * 886 * Requested by Petr Sumbera <petr.sumbera@oracle.com>. 887 */ 888 #define LINKTYPE_IPOIB 242 889 890 /* 891 * MPEG-2 transport stream (ISO 13818-1/ITU-T H.222.0). 892 * 893 * Requested by Guy Martin <gmsoft@tuxicoman.be>. 894 */ 895 #define LINKTYPE_MPEG_2_TS 243 896 897 /* 898 * ng4T GmbH's UMTS Iub/Iur-over-ATM and Iub/Iur-over-IP format as 899 * used by their ng40 protocol tester. 900 * 901 * Requested by Jens Grimmer <jens.grimmer@ng4t.com>. 902 */ 903 #define LINKTYPE_NG40 244 904 905 /* 906 * Pseudo-header giving adapter number and flags, followed by an NFC 907 * (Near-Field Communications) Logical Link Control Protocol (LLCP) PDU, 908 * as specified by NFC Forum Logical Link Control Protocol Technical 909 * Specification LLCP 1.1. 910 * 911 * Requested by Mike Wakerly <mikey@google.com>. 912 */ 913 #define LINKTYPE_NFC_LLCP 245 914 915 /* 916 * pfsync output; DLT_PFSYNC is 18, which collides with DLT_CIP in 917 * SuSE 6.3, on OpenBSD, NetBSD, DragonFly BSD, and macOS, and 918 * is 121, which collides with DLT_HHDLC, in FreeBSD. We pick a 919 * shiny new link-layer header type value that doesn't collide with 920 * anything, in the hopes that future pfsync savefiles, if any, 921 * won't require special hacks to distinguish from other savefiles. 922 * 923 */ 924 #define LINKTYPE_PFSYNC 246 925 926 /* 927 * Raw InfiniBand packets, starting with the Local Routing Header. 928 * 929 * Requested by Oren Kladnitsky <orenk@mellanox.com>. 930 */ 931 #define LINKTYPE_INFINIBAND 247 932 933 /* 934 * SCTP, with no lower-level protocols (i.e., no IPv4 or IPv6). 935 * 936 * Requested by Michael Tuexen <Michael.Tuexen@lurchi.franken.de>. 937 */ 938 #define LINKTYPE_SCTP 248 939 940 /* 941 * USB packets, beginning with a USBPcap header. 942 * 943 * Requested by Tomasz Mon <desowin@gmail.com> 944 */ 945 #define LINKTYPE_USBPCAP 249 946 947 /* 948 * Schweitzer Engineering Laboratories "RTAC" product serial-line 949 * packets. 950 * 951 * Requested by Chris Bontje <chris_bontje@selinc.com>. 952 */ 953 #define DLT_RTAC_SERIAL 250 954 955 /* 956 * Bluetooth Low Energy air interface link-layer packets. 957 * 958 * Requested by Mike Kershaw <dragorn@kismetwireless.net>. 959 */ 960 #define LINKTYPE_BLUETOOTH_LE_LL 251 961 962 /* 963 * Link-layer header type for upper-protocol layer PDU saves from wireshark. 964 * 965 * the actual contents are determined by two TAGs stored with each 966 * packet: 967 * EXP_PDU_TAG_LINKTYPE the link type (LINKTYPE_ value) of the 968 * original packet. 969 * 970 * EXP_PDU_TAG_PROTO_NAME the name of the wireshark dissector 971 * that can make sense of the data stored. 972 */ 973 #define LINKTYPE_WIRESHARK_UPPER_PDU 252 974 975 /* 976 * Link-layer header type for the netlink protocol (nlmon devices). 977 */ 978 #define LINKTYPE_NETLINK 253 979 980 /* 981 * Bluetooth Linux Monitor headers for the BlueZ stack. 982 */ 983 #define LINKTYPE_BLUETOOTH_LINUX_MONITOR 254 984 985 /* 986 * Bluetooth Basic Rate/Enhanced Data Rate baseband packets, as 987 * captured by Ubertooth. 988 */ 989 #define LINKTYPE_BLUETOOTH_BREDR_BB 255 990 991 /* 992 * Bluetooth Low Energy link layer packets, as captured by Ubertooth. 993 */ 994 #define LINKTYPE_BLUETOOTH_LE_LL_WITH_PHDR 256 995 996 /* 997 * PROFIBUS data link layer. 998 */ 999 #define LINKTYPE_PROFIBUS_DL 257 1000 1001 /* 1002 * Apple's DLT_PKTAP headers. 1003 * 1004 * Sadly, the folks at Apple either had no clue that the DLT_USERn values 1005 * are for internal use within an organization and partners only, and 1006 * didn't know that the right way to get a link-layer header type is to 1007 * ask tcpdump.org for one, or knew and didn't care, so they just 1008 * used DLT_USER2, which causes problems for everything except for 1009 * their version of tcpdump. 1010 * 1011 * So I'll just give them one; hopefully this will show up in a 1012 * libpcap release in time for them to get this into 10.10 Big Sur 1013 * or whatever Mavericks' successor is called. LINKTYPE_PKTAP 1014 * will be 258 *even on macOS*; that is *intentional*, so that 1015 * PKTAP files look the same on *all* OSes (different OSes can have 1016 * different numerical values for a given DLT_, but *MUST NOT* have 1017 * different values for what goes in a file, as files can be moved 1018 * between OSes!). 1019 */ 1020 #define LINKTYPE_PKTAP 258 1021 1022 /* 1023 * Ethernet packets preceded by a header giving the last 6 octets 1024 * of the preamble specified by 802.3-2012 Clause 65, section 1025 * 65.1.3.2 "Transmit". 1026 */ 1027 #define LINKTYPE_EPON 259 1028 1029 /* 1030 * IPMI trace packets, as specified by Table 3-20 "Trace Data Block Format" 1031 * in the PICMG HPM.2 specification. 1032 */ 1033 #define LINKTYPE_IPMI_HPM_2 260 1034 1035 /* 1036 * per Joshua Wright <jwright@hasborg.com>, formats for Zwave captures. 1037 */ 1038 #define LINKTYPE_ZWAVE_R1_R2 261 1039 #define LINKTYPE_ZWAVE_R3 262 1040 1041 /* 1042 * per Steve Karg <skarg@users.sourceforge.net>, formats for Wattstopper 1043 * Digital Lighting Management room bus serial protocol captures. 1044 */ 1045 #define LINKTYPE_WATTSTOPPER_DLM 263 1046 1047 /* 1048 * ISO 14443 contactless smart card messages. 1049 */ 1050 #define LINKTYPE_ISO_14443 264 1051 1052 /* 1053 * Radio data system (RDS) groups. IEC 62106. 1054 * Per Jonathan Brucker <jonathan.brucke@gmail.com>. 1055 */ 1056 #define LINKTYPE_RDS 265 1057 1058 /* 1059 * USB packets, beginning with a Darwin (macOS, etc.) header. 1060 */ 1061 #define LINKTYPE_USB_DARWIN 266 1062 1063 /* 1064 * OpenBSD DLT_OPENFLOW. 1065 */ 1066 #define LINKTYPE_OPENFLOW 267 1067 1068 /* 1069 * SDLC frames containing SNA PDUs. 1070 */ 1071 #define LINKTYPE_SDLC 268 1072 1073 /* 1074 * per "Selvig, Bjorn" <b.selvig@ti.com> used for 1075 * TI protocol sniffer. 1076 */ 1077 #define LINKTYPE_TI_LLN_SNIFFER 269 1078 1079 /* 1080 * per: Erik de Jong <erikdejong at gmail.com> for 1081 * https://github.com/eriknl/LoRaTap/releases/tag/v0.1 1082 */ 1083 #define LINKTYPE_LORATAP 270 1084 1085 /* 1086 * per: Stefanha at gmail.com for 1087 * http://lists.sandelman.ca/pipermail/tcpdump-workers/2017-May/000772.html 1088 * and: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/vsockmon.h 1089 * for: http://qemu-project.org/Features/VirtioVsock 1090 */ 1091 #define LINKTYPE_VSOCK 271 1092 1093 /* 1094 * Nordic Semiconductor Bluetooth LE sniffer. 1095 */ 1096 #define LINKTYPE_NORDIC_BLE 272 1097 1098 /* 1099 * Excentis DOCSIS 3.1 RF sniffer (XRA-31) 1100 * per: bruno.verstuyft at excentis.com 1101 * http://www.xra31.com/xra-header 1102 */ 1103 #define LINKTYPE_DOCSIS31_XRA31 273 1104 1105 /* 1106 * mPackets, as specified by IEEE 802.3br Figure 99-4, starting 1107 * with the preamble and always ending with a CRC field. 1108 */ 1109 #define LINKTYPE_ETHERNET_MPACKET 274 1110 1111 /* 1112 * DisplayPort AUX channel monitoring data as specified by VESA 1113 * DisplayPort(DP) Standard preceeded by a pseudo-header. 1114 * per dirk.eibach at gdsys.cc 1115 */ 1116 #define LINKTYPE_DISPLAYPORT_AUX 275 1117 1118 /* 1119 * Linux cooked sockets v2. 1120 */ 1121 #define LINKTYPE_LINUX_SLL2 276 1122 1123 #define LINKTYPE_MATCHING_MAX 276 /* highest value in the "matching" range */ 1124 1125 /* 1126 * The DLT_ and LINKTYPE_ values in the "matching" range should be the 1127 * same, so DLT_MATCHING_MAX and LINKTYPE_MATCHING_MAX should be the 1128 * same. 1129 */ 1130 #if LINKTYPE_MATCHING_MAX != DLT_MATCHING_MAX 1131 #error The LINKTYPE_ matching range does not match the DLT_ matching range 1132 #endif 1133 1134 static struct linktype_map { 1135 int dlt; 1136 int linktype; 1137 } map[] = { 1138 /* 1139 * These DLT_* codes have LINKTYPE_* codes with values identical 1140 * to the values of the corresponding DLT_* code. 1141 */ 1142 { DLT_NULL, LINKTYPE_NULL }, 1143 { DLT_EN10MB, LINKTYPE_ETHERNET }, 1144 { DLT_EN3MB, LINKTYPE_EXP_ETHERNET }, 1145 { DLT_AX25, LINKTYPE_AX25 }, 1146 { DLT_PRONET, LINKTYPE_PRONET }, 1147 { DLT_CHAOS, LINKTYPE_CHAOS }, 1148 { DLT_IEEE802, LINKTYPE_IEEE802_5 }, 1149 { DLT_ARCNET, LINKTYPE_ARCNET_BSD }, 1150 { DLT_SLIP, LINKTYPE_SLIP }, 1151 { DLT_PPP, LINKTYPE_PPP }, 1152 { DLT_FDDI, LINKTYPE_FDDI }, 1153 { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL }, 1154 1155 /* 1156 * These DLT_* codes have different values on different 1157 * platforms; we map them to LINKTYPE_* codes that 1158 * have values that should never be equal to any DLT_* 1159 * code. 1160 */ 1161 #ifdef DLT_FR 1162 /* BSD/OS Frame Relay */ 1163 { DLT_FR, LINKTYPE_FRELAY }, 1164 #endif 1165 1166 { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 }, 1167 { DLT_RAW, LINKTYPE_RAW }, 1168 { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS }, 1169 { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS }, 1170 1171 /* BSD/OS Cisco HDLC */ 1172 { DLT_C_HDLC, LINKTYPE_C_HDLC }, 1173 1174 /* 1175 * These DLT_* codes are not on all platforms, but, so far, 1176 * there don't appear to be any platforms that define 1177 * other codes with those values; we map them to 1178 * different LINKTYPE_* values anyway, just in case. 1179 */ 1180 1181 /* Linux ATM Classical IP */ 1182 { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP }, 1183 1184 /* NetBSD sync/async serial PPP (or Cisco HDLC) */ 1185 { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC }, 1186 1187 /* NetBSD PPP over Ethernet */ 1188 { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER }, 1189 1190 /* 1191 * All LINKTYPE_ values between LINKTYPE_MATCHING_MIN 1192 * and LINKTYPE_MATCHING_MAX are mapped to identical 1193 * DLT_ values. 1194 */ 1195 1196 { -1, -1 } 1197 }; 1198 1199 int 1200 dlt_to_linktype(int dlt) 1201 { 1202 int i; 1203 1204 /* 1205 * DLTs that, on some platforms, have values in the matching range 1206 * but that *don't* have the same value as the corresponding 1207 * LINKTYPE because, for some reason, not all OSes have the 1208 * same value for that DLT (note that the DLT's value might be 1209 * outside the matching range on some of those OSes). 1210 */ 1211 if (dlt == DLT_PFSYNC) 1212 return (LINKTYPE_PFSYNC); 1213 if (dlt == DLT_PKTAP) 1214 return (LINKTYPE_PKTAP); 1215 1216 /* 1217 * For all other values in the matching range, the DLT 1218 * value is the same as the LINKTYPE value. 1219 */ 1220 if (dlt >= DLT_MATCHING_MIN && dlt <= DLT_MATCHING_MAX) 1221 return (dlt); 1222 1223 /* 1224 * Map the values outside that range. 1225 */ 1226 for (i = 0; map[i].dlt != -1; i++) { 1227 if (map[i].dlt == dlt) 1228 return (map[i].linktype); 1229 } 1230 1231 /* 1232 * If we don't have a mapping for this DLT, return an 1233 * error; that means that this is a value with no corresponding 1234 * LINKTYPE, and we need to assign one. 1235 */ 1236 return (-1); 1237 } 1238 1239 int 1240 linktype_to_dlt(int linktype) 1241 { 1242 int i; 1243 1244 /* 1245 * LINKTYPEs in the matching range that *don't* 1246 * have the same value as the corresponding DLTs 1247 * because, for some reason, not all OSes have the 1248 * same value for that DLT. 1249 */ 1250 if (linktype == LINKTYPE_PFSYNC) 1251 return (DLT_PFSYNC); 1252 if (linktype == LINKTYPE_PKTAP) 1253 return (DLT_PKTAP); 1254 1255 /* 1256 * For all other values in the matching range, the LINKTYPE 1257 * value is the same as the DLT value. 1258 */ 1259 if (linktype >= LINKTYPE_MATCHING_MIN && 1260 linktype <= LINKTYPE_MATCHING_MAX) 1261 return (linktype); 1262 1263 /* 1264 * Map the values outside that range. 1265 */ 1266 for (i = 0; map[i].linktype != -1; i++) { 1267 if (map[i].linktype == linktype) 1268 return (map[i].dlt); 1269 } 1270 1271 /* 1272 * If we don't have an entry for this LINKTYPE, return 1273 * the link type value; it may be a DLT from an older 1274 * version of libpcap. 1275 */ 1276 return linktype; 1277 } 1278 1279 /* 1280 * Return the maximum snapshot length for a given DLT_ value. 1281 * 1282 * For most link-layer types, we use MAXIMUM_SNAPLEN. 1283 * 1284 * For DLT_DBUS, the maximum is 128MiB, as per 1285 * 1286 * https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages 1287 * 1288 * For DLT_USBPCAP, the maximum is 1MiB, as per 1289 * 1290 * https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=15985 1291 */ 1292 u_int 1293 max_snaplen_for_dlt(int dlt) 1294 { 1295 switch (dlt) { 1296 1297 case DLT_DBUS: 1298 return 128*1024*1024; 1299 1300 case DLT_USBPCAP: 1301 return 1024*1024; 1302 1303 default: 1304 return MAXIMUM_SNAPLEN; 1305 } 1306 } 1307 1308 /* 1309 * DLT_LINUX_SLL packets with a protocol type of LINUX_SLL_P_CAN or 1310 * LINUX_SLL_P_CANFD have SocketCAN headers in front of the payload, 1311 * with the CAN ID being in host byte order. 1312 * 1313 * When reading a DLT_LINUX_SLL capture file, we need to check for those 1314 * packets and convert the CAN ID from the byte order of the host that 1315 * wrote the file to this host's byte order. 1316 */ 1317 static void 1318 swap_linux_sll_header(const struct pcap_pkthdr *hdr, u_char *buf) 1319 { 1320 u_int caplen = hdr->caplen; 1321 u_int length = hdr->len; 1322 struct sll_header *shdr = (struct sll_header *)buf; 1323 uint16_t protocol; 1324 pcap_can_socketcan_hdr *chdr; 1325 1326 if (caplen < (u_int) sizeof(struct sll_header) || 1327 length < (u_int) sizeof(struct sll_header)) { 1328 /* Not enough data to have the protocol field */ 1329 return; 1330 } 1331 1332 protocol = EXTRACT_16BITS(&shdr->sll_protocol); 1333 if (protocol != LINUX_SLL_P_CAN && protocol != LINUX_SLL_P_CANFD) 1334 return; 1335 1336 /* 1337 * SocketCAN packet; fix up the packet's header. 1338 */ 1339 chdr = (pcap_can_socketcan_hdr *)(buf + sizeof(struct sll_header)); 1340 if (caplen < (u_int) sizeof(struct sll_header) + sizeof(chdr->can_id) || 1341 length < (u_int) sizeof(struct sll_header) + sizeof(chdr->can_id)) { 1342 /* Not enough data to have the CAN ID */ 1343 return; 1344 } 1345 chdr->can_id = SWAPLONG(chdr->can_id); 1346 } 1347 1348 /* 1349 * The DLT_USB_LINUX and DLT_USB_LINUX_MMAPPED headers are in host 1350 * byte order when capturing (it's supplied directly from a 1351 * memory-mapped buffer shared by the kernel). 1352 * 1353 * When reading a DLT_USB_LINUX or DLT_USB_LINUX_MMAPPED capture file, 1354 * we need to convert it from the byte order of the host that wrote 1355 * the file to this host's byte order. 1356 */ 1357 static void 1358 swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf, 1359 int header_len_64_bytes) 1360 { 1361 pcap_usb_header_mmapped *uhdr = (pcap_usb_header_mmapped *)buf; 1362 bpf_u_int32 offset = 0; 1363 1364 /* 1365 * "offset" is the offset *past* the field we're swapping; 1366 * we skip the field *before* checking to make sure 1367 * the captured data length includes the entire field. 1368 */ 1369 1370 /* 1371 * The URB id is a totally opaque value; do we really need to 1372 * convert it to the reading host's byte order??? 1373 */ 1374 offset += 8; /* skip past id */ 1375 if (hdr->caplen < offset) 1376 return; 1377 uhdr->id = SWAPLL(uhdr->id); 1378 1379 offset += 4; /* skip past various 1-byte fields */ 1380 1381 offset += 2; /* skip past bus_id */ 1382 if (hdr->caplen < offset) 1383 return; 1384 uhdr->bus_id = SWAPSHORT(uhdr->bus_id); 1385 1386 offset += 2; /* skip past various 1-byte fields */ 1387 1388 offset += 8; /* skip past ts_sec */ 1389 if (hdr->caplen < offset) 1390 return; 1391 uhdr->ts_sec = SWAPLL(uhdr->ts_sec); 1392 1393 offset += 4; /* skip past ts_usec */ 1394 if (hdr->caplen < offset) 1395 return; 1396 uhdr->ts_usec = SWAPLONG(uhdr->ts_usec); 1397 1398 offset += 4; /* skip past status */ 1399 if (hdr->caplen < offset) 1400 return; 1401 uhdr->status = SWAPLONG(uhdr->status); 1402 1403 offset += 4; /* skip past urb_len */ 1404 if (hdr->caplen < offset) 1405 return; 1406 uhdr->urb_len = SWAPLONG(uhdr->urb_len); 1407 1408 offset += 4; /* skip past data_len */ 1409 if (hdr->caplen < offset) 1410 return; 1411 uhdr->data_len = SWAPLONG(uhdr->data_len); 1412 1413 if (uhdr->transfer_type == URB_ISOCHRONOUS) { 1414 offset += 4; /* skip past s.iso.error_count */ 1415 if (hdr->caplen < offset) 1416 return; 1417 uhdr->s.iso.error_count = SWAPLONG(uhdr->s.iso.error_count); 1418 1419 offset += 4; /* skip past s.iso.numdesc */ 1420 if (hdr->caplen < offset) 1421 return; 1422 uhdr->s.iso.numdesc = SWAPLONG(uhdr->s.iso.numdesc); 1423 } else 1424 offset += 8; /* skip USB setup header */ 1425 1426 /* 1427 * With the old header, there are no isochronous descriptors 1428 * after the header. 1429 * 1430 * With the new header, the actual number of descriptors in 1431 * the header is not s.iso.numdesc, it's ndesc - only the 1432 * first N descriptors, for some value of N, are put into 1433 * the header, and ndesc is set to the actual number copied. 1434 * In addition, if s.iso.numdesc is negative, no descriptors 1435 * are captured, and ndesc is set to 0. 1436 */ 1437 if (header_len_64_bytes) { 1438 /* 1439 * This is either the "version 1" header, with 1440 * 16 bytes of additional fields at the end, or 1441 * a "version 0" header from a memory-mapped 1442 * capture, with 16 bytes of zeroed-out padding 1443 * at the end. Byte swap them as if this were 1444 * a "version 1" header. 1445 */ 1446 offset += 4; /* skip past interval */ 1447 if (hdr->caplen < offset) 1448 return; 1449 uhdr->interval = SWAPLONG(uhdr->interval); 1450 1451 offset += 4; /* skip past start_frame */ 1452 if (hdr->caplen < offset) 1453 return; 1454 uhdr->start_frame = SWAPLONG(uhdr->start_frame); 1455 1456 offset += 4; /* skip past xfer_flags */ 1457 if (hdr->caplen < offset) 1458 return; 1459 uhdr->xfer_flags = SWAPLONG(uhdr->xfer_flags); 1460 1461 offset += 4; /* skip past ndesc */ 1462 if (hdr->caplen < offset) 1463 return; 1464 uhdr->ndesc = SWAPLONG(uhdr->ndesc); 1465 1466 if (uhdr->transfer_type == URB_ISOCHRONOUS) { 1467 /* swap the values in struct linux_usb_isodesc */ 1468 usb_isodesc *pisodesc; 1469 uint32_t i; 1470 1471 pisodesc = (usb_isodesc *)(void *)(buf+offset); 1472 for (i = 0; i < uhdr->ndesc; i++) { 1473 offset += 4; /* skip past status */ 1474 if (hdr->caplen < offset) 1475 return; 1476 pisodesc->status = SWAPLONG(pisodesc->status); 1477 1478 offset += 4; /* skip past offset */ 1479 if (hdr->caplen < offset) 1480 return; 1481 pisodesc->offset = SWAPLONG(pisodesc->offset); 1482 1483 offset += 4; /* skip past len */ 1484 if (hdr->caplen < offset) 1485 return; 1486 pisodesc->len = SWAPLONG(pisodesc->len); 1487 1488 offset += 4; /* skip past padding */ 1489 1490 pisodesc++; 1491 } 1492 } 1493 } 1494 } 1495 1496 /* 1497 * The DLT_NFLOG "packets" have a mixture of big-endian and host-byte-order 1498 * data. They begin with a fixed-length header with big-endian fields, 1499 * followed by a set of TLVs, where the type and length are in host 1500 * byte order but the values are either big-endian or are a raw byte 1501 * sequence that's the same regardless of the host's byte order. 1502 * 1503 * When reading a DLT_NFLOG capture file, we need to convert the type 1504 * and length values from the byte order of the host that wrote the 1505 * file to the byte order of this host. 1506 */ 1507 static void 1508 swap_nflog_header(const struct pcap_pkthdr *hdr, u_char *buf) 1509 { 1510 u_char *p = buf; 1511 nflog_hdr_t *nfhdr = (nflog_hdr_t *)buf; 1512 nflog_tlv_t *tlv; 1513 u_int caplen = hdr->caplen; 1514 u_int length = hdr->len; 1515 uint16_t size; 1516 1517 if (caplen < (u_int) sizeof(nflog_hdr_t) || 1518 length < (u_int) sizeof(nflog_hdr_t)) { 1519 /* Not enough data to have any TLVs. */ 1520 return; 1521 } 1522 1523 if (nfhdr->nflog_version != 0) { 1524 /* Unknown NFLOG version */ 1525 return; 1526 } 1527 1528 length -= sizeof(nflog_hdr_t); 1529 caplen -= sizeof(nflog_hdr_t); 1530 p += sizeof(nflog_hdr_t); 1531 1532 while (caplen >= sizeof(nflog_tlv_t)) { 1533 tlv = (nflog_tlv_t *) p; 1534 1535 /* Swap the type and length. */ 1536 tlv->tlv_type = SWAPSHORT(tlv->tlv_type); 1537 tlv->tlv_length = SWAPSHORT(tlv->tlv_length); 1538 1539 /* Get the length of the TLV. */ 1540 size = tlv->tlv_length; 1541 if (size % 4 != 0) 1542 size += 4 - size % 4; 1543 1544 /* Is the TLV's length less than the minimum? */ 1545 if (size < sizeof(nflog_tlv_t)) { 1546 /* Yes. Give up now. */ 1547 return; 1548 } 1549 1550 /* Do we have enough data for the full TLV? */ 1551 if (caplen < size || length < size) { 1552 /* No. */ 1553 return; 1554 } 1555 1556 /* Skip over the TLV. */ 1557 length -= size; 1558 caplen -= size; 1559 p += size; 1560 } 1561 } 1562 1563 void 1564 swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr, u_char *data) 1565 { 1566 /* 1567 * Convert pseudo-headers from the byte order of 1568 * the host on which the file was saved to our 1569 * byte order, as necessary. 1570 */ 1571 switch (linktype) { 1572 1573 case DLT_LINUX_SLL: 1574 swap_linux_sll_header(hdr, data); 1575 break; 1576 1577 case DLT_USB_LINUX: 1578 swap_linux_usb_header(hdr, data, 0); 1579 break; 1580 1581 case DLT_USB_LINUX_MMAPPED: 1582 swap_linux_usb_header(hdr, data, 1); 1583 break; 1584 1585 case DLT_NFLOG: 1586 swap_nflog_header(hdr, data); 1587 break; 1588 } 1589 } 1590