1 /* 2 * Copyright (c) 1993, 1994, 1995, 1996, 1997 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 * 21 * pcap-common.c - common code for pcap and pcap-ng files 22 */ 23 24 #ifdef HAVE_CONFIG_H 25 #include "config.h" 26 #endif 27 28 #ifdef _WIN32 29 #include <pcap-stdinc.h> 30 #else /* _WIN32 */ 31 #if HAVE_INTTYPES_H 32 #include <inttypes.h> 33 #elif HAVE_STDINT_H 34 #include <stdint.h> 35 #endif 36 #ifdef HAVE_SYS_BITYPES_H 37 #include <sys/bitypes.h> 38 #endif 39 #include <sys/types.h> 40 #endif /* _WIN32 */ 41 42 #include "pcap-int.h" 43 #include "extract.h" 44 #include "pcap/sll.h" 45 #include "pcap/usb.h" 46 #include "pcap/nflog.h" 47 #include "pcap/can_socketcan.h" 48 49 #include "pcap-common.h" 50 51 /* 52 * We don't write DLT_* values to capture files, because they're not the 53 * same on all platforms. 54 * 55 * Unfortunately, the various flavors of BSD have not always used the same 56 * numerical values for the same data types, and various patches to 57 * libpcap for non-BSD OSes have added their own DLT_* codes for link 58 * layer encapsulation types seen on those OSes, and those codes have had, 59 * in some cases, values that were also used, on other platforms, for other 60 * link layer encapsulation types. 61 * 62 * This means that capture files of a type whose numerical DLT_* code 63 * means different things on different BSDs, or with different versions 64 * of libpcap, can't always be read on systems other than those like 65 * the one running on the machine on which the capture was made. 66 * 67 * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes 68 * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_* 69 * codes to DLT_* codes when reading a savefile header. 70 * 71 * For those DLT_* codes that have, as far as we know, the same values on 72 * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as 73 * DLT_xxx; that way, captures of those types can still be read by 74 * versions of libpcap that map LINKTYPE_* values to DLT_* values, and 75 * captures of those types written by versions of libpcap that map DLT_ 76 * values to LINKTYPE_ values can still be read by older versions 77 * of libpcap. 78 * 79 * The other LINKTYPE_* codes are given values starting at 100, in the 80 * hopes that no DLT_* code will be given one of those values. 81 * 82 * In order to ensure that a given LINKTYPE_* code's value will refer to 83 * the same encapsulation type on all platforms, you should not allocate 84 * a new LINKTYPE_* value without consulting 85 * "tcpdump-workers@lists.tcpdump.org". The tcpdump developers will 86 * allocate a value for you, and will not subsequently allocate it to 87 * anybody else; that value will be added to the "pcap.h" in the 88 * tcpdump.org Git repository, so that a future libpcap release will 89 * include it. 90 * 91 * You should, if possible, also contribute patches to libpcap and tcpdump 92 * to handle the new encapsulation type, so that they can also be checked 93 * into the tcpdump.org Git repository and so that they will appear in 94 * future libpcap and tcpdump releases. 95 * 96 * Do *NOT* assume that any values after the largest value in this file 97 * are available; you might not have the most up-to-date version of this 98 * file, and new values after that one might have been assigned. Also, 99 * do *NOT* use any values below 100 - those might already have been 100 * taken by one (or more!) organizations. 101 * 102 * Any platform that defines additional DLT_* codes should: 103 * 104 * request a LINKTYPE_* code and value from tcpdump.org, 105 * as per the above; 106 * 107 * add, in their version of libpcap, an entry to map 108 * those DLT_* codes to the corresponding LINKTYPE_* 109 * code; 110 * 111 * redefine, in their "net/bpf.h", any DLT_* values 112 * that collide with the values used by their additional 113 * DLT_* codes, to remove those collisions (but without 114 * making them collide with any of the LINKTYPE_* 115 * values equal to 50 or above; they should also avoid 116 * defining DLT_* values that collide with those 117 * LINKTYPE_* values, either). 118 */ 119 #define LINKTYPE_NULL DLT_NULL 120 #define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */ 121 #define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */ 122 #define LINKTYPE_AX25 DLT_AX25 123 #define LINKTYPE_PRONET DLT_PRONET 124 #define LINKTYPE_CHAOS DLT_CHAOS 125 #define LINKTYPE_IEEE802_5 DLT_IEEE802 /* DLT_IEEE802 is used for 802.5 Token Ring */ 126 #define LINKTYPE_ARCNET_BSD DLT_ARCNET /* BSD-style headers */ 127 #define LINKTYPE_SLIP DLT_SLIP 128 #define LINKTYPE_PPP DLT_PPP 129 #define LINKTYPE_FDDI DLT_FDDI 130 131 /* 132 * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662 133 * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol 134 * field) at the beginning of the packet. 135 * 136 * This is for use when there is always such a header; the address field 137 * might be 0xff, for regular PPP, or it might be an address field for Cisco 138 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco 139 * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL. 140 * 141 * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that 142 * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL 143 * captures will be written out with a link type that NetBSD's tcpdump 144 * can read. 145 */ 146 #define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */ 147 148 #define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */ 149 150 #define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */ 151 152 /* 153 * These correspond to DLT_s that have different values on different 154 * platforms; we map between these values in capture files and 155 * the DLT_ values as returned by pcap_datalink() and passed to 156 * pcap_open_dead(). 157 */ 158 #define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */ 159 #define LINKTYPE_RAW 101 /* raw IP */ 160 #define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */ 161 #define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */ 162 163 /* 164 * Values starting with 104 are used for newly-assigned link-layer 165 * header type values; for those link-layer header types, the DLT_ 166 * value returned by pcap_datalink() and passed to pcap_open_dead(), 167 * and the LINKTYPE_ value that appears in capture files, are the 168 * same. 169 * 170 * LINKTYPE_MATCHING_MIN is the lowest such value; LINKTYPE_MATCHING_MAX 171 * is the highest such value. 172 */ 173 #define LINKTYPE_MATCHING_MIN 104 /* lowest value in the "matching" range */ 174 175 #define LINKTYPE_C_HDLC 104 /* Cisco HDLC */ 176 #define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */ 177 #define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */ 178 #define LINKTYPE_FRELAY 107 /* Frame Relay */ 179 #define LINKTYPE_LOOP 108 /* OpenBSD loopback */ 180 #define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */ 181 182 /* 183 * These three types are reserved for future use. 184 */ 185 #define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */ 186 #define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */ 187 #define LINKTYPE_HDLC 112 /* NetBSD HDLC framing */ 188 189 #define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */ 190 #define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */ 191 #define LINKTYPE_ECONET 115 /* Acorn Econet */ 192 193 /* 194 * Reserved for use with OpenBSD ipfilter. 195 */ 196 #define LINKTYPE_IPFILTER 116 197 198 #define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */ 199 #define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */ 200 #define LINKTYPE_IEEE802_11_PRISM 119 /* 802.11 plus Prism II monitor mode radio metadata header */ 201 #define LINKTYPE_IEEE802_11_AIRONET 120 /* 802.11 plus FreeBSD Aironet driver radio metadata header */ 202 203 /* 204 * Reserved for Siemens HiPath HDLC. 205 */ 206 #define LINKTYPE_HHDLC 121 207 208 #define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */ 209 #define LINKTYPE_SUNATM 123 /* Solaris+SunATM */ 210 211 /* 212 * Reserved as per request from Kent Dahlgren <kent@praesum.com> 213 * for private use. 214 */ 215 #define LINKTYPE_RIO 124 /* RapidIO */ 216 #define LINKTYPE_PCI_EXP 125 /* PCI Express */ 217 #define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */ 218 219 #define LINKTYPE_IEEE802_11_RADIOTAP 127 /* 802.11 plus radiotap radio metadata header */ 220 221 /* 222 * Reserved for the TZSP encapsulation, as per request from 223 * Chris Waters <chris.waters@networkchemistry.com> 224 * TZSP is a generic encapsulation for any other link type, 225 * which includes a means to include meta-information 226 * with the packet, e.g. signal strength and channel 227 * for 802.11 packets. 228 */ 229 #define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */ 230 231 #define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */ 232 233 /* 234 * Juniper-private data link types, as per request from 235 * Hannes Gredler <hannes@juniper.net>. The corresponding 236 * DLT_s are used for passing on chassis-internal 237 * metainformation such as QOS profiles, etc.. 238 */ 239 #define LINKTYPE_JUNIPER_MLPPP 130 240 #define LINKTYPE_JUNIPER_MLFR 131 241 #define LINKTYPE_JUNIPER_ES 132 242 #define LINKTYPE_JUNIPER_GGSN 133 243 #define LINKTYPE_JUNIPER_MFR 134 244 #define LINKTYPE_JUNIPER_ATM2 135 245 #define LINKTYPE_JUNIPER_SERVICES 136 246 #define LINKTYPE_JUNIPER_ATM1 137 247 248 #define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */ 249 250 #define LINKTYPE_MTP2_WITH_PHDR 139 251 #define LINKTYPE_MTP2 140 252 #define LINKTYPE_MTP3 141 253 #define LINKTYPE_SCCP 142 254 255 #define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */ 256 257 #define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */ 258 259 /* 260 * Reserved for IBM SP switch and IBM Next Federation switch. 261 */ 262 #define LINKTYPE_IBM_SP 145 263 #define LINKTYPE_IBM_SN 146 264 265 /* 266 * Reserved for private use. If you have some link-layer header type 267 * that you want to use within your organization, with the capture files 268 * using that link-layer header type not ever be sent outside your 269 * organization, you can use these values. 270 * 271 * No libpcap release will use these for any purpose, nor will any 272 * tcpdump release use them, either. 273 * 274 * Do *NOT* use these in capture files that you expect anybody not using 275 * your private versions of capture-file-reading tools to read; in 276 * particular, do *NOT* use them in products, otherwise you may find that 277 * people won't be able to use tcpdump, or snort, or Ethereal, or... to 278 * read capture files from your firewall/intrusion detection/traffic 279 * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value, 280 * and you may also find that the developers of those applications will 281 * not accept patches to let them read those files. 282 * 283 * Also, do not use them if somebody might send you a capture using them 284 * for *their* private type and tools using them for *your* private type 285 * would have to read them. 286 * 287 * Instead, in those cases, ask "tcpdump-workers@lists.tcpdump.org" for a 288 * new DLT_ and LINKTYPE_ value, as per the comment in pcap/bpf.h, and use 289 * the type you're given. 290 */ 291 #define LINKTYPE_USER0 147 292 #define LINKTYPE_USER1 148 293 #define LINKTYPE_USER2 149 294 #define LINKTYPE_USER3 150 295 #define LINKTYPE_USER4 151 296 #define LINKTYPE_USER5 152 297 #define LINKTYPE_USER6 153 298 #define LINKTYPE_USER7 154 299 #define LINKTYPE_USER8 155 300 #define LINKTYPE_USER9 156 301 #define LINKTYPE_USER10 157 302 #define LINKTYPE_USER11 158 303 #define LINKTYPE_USER12 159 304 #define LINKTYPE_USER13 160 305 #define LINKTYPE_USER14 161 306 #define LINKTYPE_USER15 162 307 308 /* 309 * For future use with 802.11 captures - defined by AbsoluteValue 310 * Systems to store a number of bits of link-layer information 311 * including radio information: 312 * 313 * http://www.shaftnet.org/~pizza/software/capturefrm.txt 314 */ 315 #define LINKTYPE_IEEE802_11_AVS 163 /* 802.11 plus AVS radio metadata header */ 316 317 /* 318 * Juniper-private data link type, as per request from 319 * Hannes Gredler <hannes@juniper.net>. The corresponding 320 * DLT_s are used for passing on chassis-internal 321 * metainformation such as QOS profiles, etc.. 322 */ 323 #define LINKTYPE_JUNIPER_MONITOR 164 324 325 /* 326 * BACnet MS/TP frames. 327 */ 328 #define LINKTYPE_BACNET_MS_TP 165 329 330 /* 331 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>. 332 * 333 * This is used in some OSes to allow a kernel socket filter to distinguish 334 * between incoming and outgoing packets, on a socket intended to 335 * supply pppd with outgoing packets so it can do dial-on-demand and 336 * hangup-on-lack-of-demand; incoming packets are filtered out so they 337 * don't cause pppd to hold the connection up (you don't want random 338 * input packets such as port scans, packets from old lost connections, 339 * etc. to force the connection to stay up). 340 * 341 * The first byte of the PPP header (0xff03) is modified to accomodate 342 * the direction - 0x00 = IN, 0x01 = OUT. 343 */ 344 #define LINKTYPE_PPP_PPPD 166 345 346 /* 347 * Juniper-private data link type, as per request from 348 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used 349 * for passing on chassis-internal metainformation such as 350 * QOS profiles, cookies, etc.. 351 */ 352 #define LINKTYPE_JUNIPER_PPPOE 167 353 #define LINKTYPE_JUNIPER_PPPOE_ATM 168 354 355 #define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */ 356 #define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */ 357 #define LINKTYPE_GPF_F 171 /* GPF-F (ITU-T G.7041/Y.1303) */ 358 359 /* 360 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line 361 * monitoring equipment. 362 */ 363 #define LINKTYPE_GCOM_T1E1 172 364 #define LINKTYPE_GCOM_SERIAL 173 365 366 /* 367 * Juniper-private data link type, as per request from 368 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used 369 * for internal communication to Physical Interface Cards (PIC) 370 */ 371 #define LINKTYPE_JUNIPER_PIC_PEER 174 372 373 /* 374 * Link types requested by Gregor Maier <gregor@endace.com> of Endace 375 * Measurement Systems. They add an ERF header (see 376 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of 377 * the link-layer header. 378 */ 379 #define LINKTYPE_ERF_ETH 175 /* Ethernet */ 380 #define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */ 381 382 /* 383 * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD 384 * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header 385 * includes additional information before the LAPD header, so it's 386 * not necessarily a generic LAPD header. 387 */ 388 #define LINKTYPE_LINUX_LAPD 177 389 390 /* 391 * Juniper-private data link type, as per request from 392 * Hannes Gredler <hannes@juniper.net>. 393 * The Link Types are used for prepending meta-information 394 * like interface index, interface name 395 * before standard Ethernet, PPP, Frelay & C-HDLC Frames 396 */ 397 #define LINKTYPE_JUNIPER_ETHER 178 398 #define LINKTYPE_JUNIPER_PPP 179 399 #define LINKTYPE_JUNIPER_FRELAY 180 400 #define LINKTYPE_JUNIPER_CHDLC 181 401 402 /* 403 * Multi Link Frame Relay (FRF.16) 404 */ 405 #define LINKTYPE_MFR 182 406 407 /* 408 * Juniper-private data link type, as per request from 409 * Hannes Gredler <hannes@juniper.net>. 410 * The DLT_ is used for internal communication with a 411 * voice Adapter Card (PIC) 412 */ 413 #define LINKTYPE_JUNIPER_VP 183 414 415 /* 416 * Arinc 429 frames. 417 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 418 * Every frame contains a 32bit A429 label. 419 * More documentation on Arinc 429 can be found at 420 * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf 421 */ 422 #define LINKTYPE_A429 184 423 424 /* 425 * Arinc 653 Interpartition Communication messages. 426 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 427 * Please refer to the A653-1 standard for more information. 428 */ 429 #define LINKTYPE_A653_ICM 185 430 431 /* 432 * This used to be "USB packets, beginning with a USB setup header; 433 * requested by Paolo Abeni <paolo.abeni@email.it>." 434 * 435 * However, that header didn't work all that well - it left out some 436 * useful information - and was abandoned in favor of the DLT_USB_LINUX 437 * header. 438 * 439 * This is now used by FreeBSD for its BPF taps for USB; that has its 440 * own headers. So it is written, so it is done. 441 */ 442 #define LINKTYPE_USB_FREEBSD 186 443 444 /* 445 * Bluetooth HCI UART transport layer (part H:4); requested by 446 * Paolo Abeni. 447 */ 448 #define LINKTYPE_BLUETOOTH_HCI_H4 187 449 450 /* 451 * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz 452 * <cruz_petagay@bah.com>. 453 */ 454 #define LINKTYPE_IEEE802_16_MAC_CPS 188 455 456 /* 457 * USB packets, beginning with a Linux USB header; requested by 458 * Paolo Abeni <paolo.abeni@email.it>. 459 */ 460 #define LINKTYPE_USB_LINUX 189 461 462 /* 463 * Controller Area Network (CAN) v. 2.0B packets. 464 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 465 * Used to dump CAN packets coming from a CAN Vector board. 466 * More documentation on the CAN v2.0B frames can be found at 467 * http://www.can-cia.org/downloads/?269 468 */ 469 #define LINKTYPE_CAN20B 190 470 471 /* 472 * IEEE 802.15.4, with address fields padded, as is done by Linux 473 * drivers; requested by Juergen Schimmer. 474 */ 475 #define LINKTYPE_IEEE802_15_4_LINUX 191 476 477 /* 478 * Per Packet Information encapsulated packets. 479 * LINKTYPE_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 480 */ 481 #define LINKTYPE_PPI 192 482 483 /* 484 * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header; 485 * requested by Charles Clancy. 486 */ 487 #define LINKTYPE_IEEE802_16_MAC_CPS_RADIO 193 488 489 /* 490 * Juniper-private data link type, as per request from 491 * Hannes Gredler <hannes@juniper.net>. 492 * The DLT_ is used for internal communication with a 493 * integrated service module (ISM). 494 */ 495 #define LINKTYPE_JUNIPER_ISM 194 496 497 /* 498 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 499 * nothing); requested by Mikko Saarnivala <mikko.saarnivala@sensinode.com>. 500 */ 501 #define LINKTYPE_IEEE802_15_4 195 502 503 /* 504 * Various link-layer types, with a pseudo-header, for SITA 505 * (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com). 506 */ 507 #define LINKTYPE_SITA 196 508 509 /* 510 * Various link-layer types, with a pseudo-header, for Endace DAG cards; 511 * encapsulates Endace ERF records. Requested by Stephen Donnelly 512 * <stephen@endace.com>. 513 */ 514 #define LINKTYPE_ERF 197 515 516 /* 517 * Special header prepended to Ethernet packets when capturing from a 518 * u10 Networks board. Requested by Phil Mulholland 519 * <phil@u10networks.com>. 520 */ 521 #define LINKTYPE_RAIF1 198 522 523 /* 524 * IPMB packet for IPMI, beginning with the I2C slave address, followed 525 * by the netFn and LUN, etc.. Requested by Chanthy Toeung 526 * <chanthy.toeung@ca.kontron.com>. 527 */ 528 #define LINKTYPE_IPMB 199 529 530 /* 531 * Juniper-private data link type, as per request from 532 * Hannes Gredler <hannes@juniper.net>. 533 * The DLT_ is used for capturing data on a secure tunnel interface. 534 */ 535 #define LINKTYPE_JUNIPER_ST 200 536 537 /* 538 * Bluetooth HCI UART transport layer (part H:4), with pseudo-header 539 * that includes direction information; requested by Paolo Abeni. 540 */ 541 #define LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR 201 542 543 /* 544 * AX.25 packet with a 1-byte KISS header; see 545 * 546 * http://www.ax25.net/kiss.htm 547 * 548 * as per Richard Stearn <richard@rns-stearn.demon.co.uk>. 549 */ 550 #define LINKTYPE_AX25_KISS 202 551 552 /* 553 * LAPD packets from an ISDN channel, starting with the address field, 554 * with no pseudo-header. 555 * Requested by Varuna De Silva <varunax@gmail.com>. 556 */ 557 #define LINKTYPE_LAPD 203 558 559 /* 560 * Variants of various link-layer headers, with a one-byte direction 561 * pseudo-header prepended - zero means "received by this host", 562 * non-zero (any non-zero value) means "sent by this host" - as per 563 * Will Barker <w.barker@zen.co.uk>. 564 */ 565 #define LINKTYPE_PPP_WITH_DIR 204 /* PPP */ 566 #define LINKTYPE_C_HDLC_WITH_DIR 205 /* Cisco HDLC */ 567 #define LINKTYPE_FRELAY_WITH_DIR 206 /* Frame Relay */ 568 #define LINKTYPE_LAPB_WITH_DIR 207 /* LAPB */ 569 570 /* 571 * 208 is reserved for an as-yet-unspecified proprietary link-layer 572 * type, as requested by Will Barker. 573 */ 574 575 /* 576 * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman 577 * <avn@pigeonpoint.com>. 578 */ 579 #define LINKTYPE_IPMB_LINUX 209 580 581 /* 582 * FlexRay automotive bus - http://www.flexray.com/ - as requested 583 * by Hannes Kaelber <hannes.kaelber@x2e.de>. 584 */ 585 #define LINKTYPE_FLEXRAY 210 586 587 /* 588 * Media Oriented Systems Transport (MOST) bus for multimedia 589 * transport - http://www.mostcooperation.com/ - as requested 590 * by Hannes Kaelber <hannes.kaelber@x2e.de>. 591 */ 592 #define LINKTYPE_MOST 211 593 594 /* 595 * Local Interconnect Network (LIN) bus for vehicle networks - 596 * http://www.lin-subbus.org/ - as requested by Hannes Kaelber 597 * <hannes.kaelber@x2e.de>. 598 */ 599 #define LINKTYPE_LIN 212 600 601 /* 602 * X2E-private data link type used for serial line capture, 603 * as requested by Hannes Kaelber <hannes.kaelber@x2e.de>. 604 */ 605 #define LINKTYPE_X2E_SERIAL 213 606 607 /* 608 * X2E-private data link type used for the Xoraya data logger 609 * family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>. 610 */ 611 #define LINKTYPE_X2E_XORAYA 214 612 613 /* 614 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 615 * nothing), but with the PHY-level data for non-ASK PHYs (4 octets 616 * of 0 as preamble, one octet of SFD, one octet of frame length+ 617 * reserved bit, and then the MAC-layer data, starting with the 618 * frame control field). 619 * 620 * Requested by Max Filippov <jcmvbkbc@gmail.com>. 621 */ 622 #define LINKTYPE_IEEE802_15_4_NONASK_PHY 215 623 624 /* 625 * David Gibson <david@gibson.dropbear.id.au> requested this for 626 * captures from the Linux kernel /dev/input/eventN devices. This 627 * is used to communicate keystrokes and mouse movements from the 628 * Linux kernel to display systems, such as Xorg. 629 */ 630 #define LINKTYPE_LINUX_EVDEV 216 631 632 /* 633 * GSM Um and Abis interfaces, preceded by a "gsmtap" header. 634 * 635 * Requested by Harald Welte <laforge@gnumonks.org>. 636 */ 637 #define LINKTYPE_GSMTAP_UM 217 638 #define LINKTYPE_GSMTAP_ABIS 218 639 640 /* 641 * MPLS, with an MPLS label as the link-layer header. 642 * Requested by Michele Marchetto <michele@openbsd.org> on behalf 643 * of OpenBSD. 644 */ 645 #define LINKTYPE_MPLS 219 646 647 /* 648 * USB packets, beginning with a Linux USB header, with the USB header 649 * padded to 64 bytes; required for memory-mapped access. 650 */ 651 #define LINKTYPE_USB_LINUX_MMAPPED 220 652 653 /* 654 * DECT packets, with a pseudo-header; requested by 655 * Matthias Wenzel <tcpdump@mazzoo.de>. 656 */ 657 #define LINKTYPE_DECT 221 658 659 /* 660 * From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1@nasa.gov> 661 * Date: Mon, 11 May 2009 11:18:30 -0500 662 * 663 * DLT_AOS. We need it for AOS Space Data Link Protocol. 664 * I have already written dissectors for but need an OK from 665 * legal before I can submit a patch. 666 * 667 */ 668 #define LINKTYPE_AOS 222 669 670 /* 671 * Wireless HART (Highway Addressable Remote Transducer) 672 * From the HART Communication Foundation 673 * IES/PAS 62591 674 * 675 * Requested by Sam Roberts <vieuxtech@gmail.com>. 676 */ 677 #define LINKTYPE_WIHART 223 678 679 /* 680 * Fibre Channel FC-2 frames, beginning with a Frame_Header. 681 * Requested by Kahou Lei <kahou82@gmail.com>. 682 */ 683 #define LINKTYPE_FC_2 224 684 685 /* 686 * Fibre Channel FC-2 frames, beginning with an encoding of the 687 * SOF, and ending with an encoding of the EOF. 688 * 689 * The encodings represent the frame delimiters as 4-byte sequences 690 * representing the corresponding ordered sets, with K28.5 691 * represented as 0xBC, and the D symbols as the corresponding 692 * byte values; for example, SOFi2, which is K28.5 - D21.5 - D1.2 - D21.2, 693 * is represented as 0xBC 0xB5 0x55 0x55. 694 * 695 * Requested by Kahou Lei <kahou82@gmail.com>. 696 */ 697 #define LINKTYPE_FC_2_WITH_FRAME_DELIMS 225 698 699 /* 700 * Solaris ipnet pseudo-header; requested by Darren Reed <Darren.Reed@Sun.COM>. 701 * 702 * The pseudo-header starts with a one-byte version number; for version 2, 703 * the pseudo-header is: 704 * 705 * struct dl_ipnetinfo { 706 * u_int8_t dli_version; 707 * u_int8_t dli_family; 708 * u_int16_t dli_htype; 709 * u_int32_t dli_pktlen; 710 * u_int32_t dli_ifindex; 711 * u_int32_t dli_grifindex; 712 * u_int32_t dli_zsrc; 713 * u_int32_t dli_zdst; 714 * }; 715 * 716 * dli_version is 2 for the current version of the pseudo-header. 717 * 718 * dli_family is a Solaris address family value, so it's 2 for IPv4 719 * and 26 for IPv6. 720 * 721 * dli_htype is a "hook type" - 0 for incoming packets, 1 for outgoing 722 * packets, and 2 for packets arriving from another zone on the same 723 * machine. 724 * 725 * dli_pktlen is the length of the packet data following the pseudo-header 726 * (so the captured length minus dli_pktlen is the length of the 727 * pseudo-header, assuming the entire pseudo-header was captured). 728 * 729 * dli_ifindex is the interface index of the interface on which the 730 * packet arrived. 731 * 732 * dli_grifindex is the group interface index number (for IPMP interfaces). 733 * 734 * dli_zsrc is the zone identifier for the source of the packet. 735 * 736 * dli_zdst is the zone identifier for the destination of the packet. 737 * 738 * A zone number of 0 is the global zone; a zone number of 0xffffffff 739 * means that the packet arrived from another host on the network, not 740 * from another zone on the same machine. 741 * 742 * An IPv4 or IPv6 datagram follows the pseudo-header; dli_family indicates 743 * which of those it is. 744 */ 745 #define LINKTYPE_IPNET 226 746 747 /* 748 * CAN (Controller Area Network) frames, with a pseudo-header as supplied 749 * by Linux SocketCAN, and with multi-byte numerical fields in that header 750 * in big-endian byte order. 751 * 752 * See Documentation/networking/can.txt in the Linux source. 753 * 754 * Requested by Felix Obenhuber <felix@obenhuber.de>. 755 */ 756 #define LINKTYPE_CAN_SOCKETCAN 227 757 758 /* 759 * Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies 760 * whether it's v4 or v6. Requested by Darren Reed <Darren.Reed@Sun.COM>. 761 */ 762 #define LINKTYPE_IPV4 228 763 #define LINKTYPE_IPV6 229 764 765 /* 766 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 767 * nothing), and with no FCS at the end of the frame; requested by 768 * Jon Smirl <jonsmirl@gmail.com>. 769 */ 770 #define LINKTYPE_IEEE802_15_4_NOFCS 230 771 772 /* 773 * Raw D-Bus: 774 * 775 * http://www.freedesktop.org/wiki/Software/dbus 776 * 777 * messages: 778 * 779 * http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages 780 * 781 * starting with the endianness flag, followed by the message type, etc., 782 * but without the authentication handshake before the message sequence: 783 * 784 * http://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol 785 * 786 * Requested by Martin Vidner <martin@vidner.net>. 787 */ 788 #define LINKTYPE_DBUS 231 789 790 /* 791 * Juniper-private data link type, as per request from 792 * Hannes Gredler <hannes@juniper.net>. 793 */ 794 #define LINKTYPE_JUNIPER_VS 232 795 #define LINKTYPE_JUNIPER_SRX_E2E 233 796 #define LINKTYPE_JUNIPER_FIBRECHANNEL 234 797 798 /* 799 * DVB-CI (DVB Common Interface for communication between a PC Card 800 * module and a DVB receiver). See 801 * 802 * http://www.kaiser.cx/pcap-dvbci.html 803 * 804 * for the specification. 805 * 806 * Requested by Martin Kaiser <martin@kaiser.cx>. 807 */ 808 #define LINKTYPE_DVB_CI 235 809 810 /* 811 * Variant of 3GPP TS 27.010 multiplexing protocol. Requested 812 * by Hans-Christoph Schemmel <hans-christoph.schemmel@cinterion.com>. 813 */ 814 #define LINKTYPE_MUX27010 236 815 816 /* 817 * STANAG 5066 D_PDUs. Requested by M. Baris Demiray 818 * <barisdemiray@gmail.com>. 819 */ 820 #define LINKTYPE_STANAG_5066_D_PDU 237 821 822 /* 823 * Juniper-private data link type, as per request from 824 * Hannes Gredler <hannes@juniper.net>. 825 */ 826 #define LINKTYPE_JUNIPER_ATM_CEMIC 238 827 828 /* 829 * NetFilter LOG messages 830 * (payload of netlink NFNL_SUBSYS_ULOG/NFULNL_MSG_PACKET packets) 831 * 832 * Requested by Jakub Zawadzki <darkjames-ws@darkjames.pl> 833 */ 834 #define LINKTYPE_NFLOG 239 835 836 /* 837 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type 838 * for Ethernet packets with a 4-byte pseudo-header and always 839 * with the payload including the FCS, as supplied by their 840 * netANALYZER hardware and software. 841 * 842 * Requested by Holger P. Frommer <HPfrommer@hilscher.com> 843 */ 844 #define LINKTYPE_NETANALYZER 240 845 846 /* 847 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type 848 * for Ethernet packets with a 4-byte pseudo-header and FCS and 849 * 1 byte of SFD, as supplied by their netANALYZER hardware and 850 * software. 851 * 852 * Requested by Holger P. Frommer <HPfrommer@hilscher.com> 853 */ 854 #define LINKTYPE_NETANALYZER_TRANSPARENT 241 855 856 /* 857 * IP-over-InfiniBand, as specified by RFC 4391. 858 * 859 * Requested by Petr Sumbera <petr.sumbera@oracle.com>. 860 */ 861 #define LINKTYPE_IPOIB 242 862 863 /* 864 * MPEG-2 transport stream (ISO 13818-1/ITU-T H.222.0). 865 * 866 * Requested by Guy Martin <gmsoft@tuxicoman.be>. 867 */ 868 #define LINKTYPE_MPEG_2_TS 243 869 870 /* 871 * ng4T GmbH's UMTS Iub/Iur-over-ATM and Iub/Iur-over-IP format as 872 * used by their ng40 protocol tester. 873 * 874 * Requested by Jens Grimmer <jens.grimmer@ng4t.com>. 875 */ 876 #define LINKTYPE_NG40 244 877 878 /* 879 * Pseudo-header giving adapter number and flags, followed by an NFC 880 * (Near-Field Communications) Logical Link Control Protocol (LLCP) PDU, 881 * as specified by NFC Forum Logical Link Control Protocol Technical 882 * Specification LLCP 1.1. 883 * 884 * Requested by Mike Wakerly <mikey@google.com>. 885 */ 886 #define LINKTYPE_NFC_LLCP 245 887 888 /* 889 * pfsync output; DLT_PFSYNC is 18, which collides with DLT_CIP in 890 * SuSE 6.3, on OpenBSD, NetBSD, DragonFly BSD, and Mac OS X, and 891 * is 121, which collides with DLT_HHDLC, in FreeBSD. We pick a 892 * shiny new link-layer header type value that doesn't collide with 893 * anything, in the hopes that future pfsync savefiles, if any, 894 * won't require special hacks to distinguish from other savefiles. 895 * 896 */ 897 #define LINKTYPE_PFSYNC 246 898 899 /* 900 * Raw InfiniBand packets, starting with the Local Routing Header. 901 * 902 * Requested by Oren Kladnitsky <orenk@mellanox.com>. 903 */ 904 #define LINKTYPE_INFINIBAND 247 905 906 /* 907 * SCTP, with no lower-level protocols (i.e., no IPv4 or IPv6). 908 * 909 * Requested by Michael Tuexen <Michael.Tuexen@lurchi.franken.de>. 910 */ 911 #define LINKTYPE_SCTP 248 912 913 /* 914 * USB packets, beginning with a USBPcap header. 915 * 916 * Requested by Tomasz Mon <desowin@gmail.com> 917 */ 918 #define LINKTYPE_USBPCAP 249 919 920 /* 921 * Schweitzer Engineering Laboratories "RTAC" product serial-line 922 * packets. 923 * 924 * Requested by Chris Bontje <chris_bontje@selinc.com>. 925 */ 926 #define DLT_RTAC_SERIAL 250 927 928 /* 929 * Bluetooth Low Energy air interface link-layer packets. 930 * 931 * Requested by Mike Kershaw <dragorn@kismetwireless.net>. 932 */ 933 #define LINKTYPE_BLUETOOTH_LE_LL 251 934 935 /* 936 * Link-layer header type for upper-protocol layer PDU saves from wireshark. 937 * 938 * the actual contents are determined by two TAGs stored with each 939 * packet: 940 * EXP_PDU_TAG_LINKTYPE the link type (LINKTYPE_ value) of the 941 * original packet. 942 * 943 * EXP_PDU_TAG_PROTO_NAME the name of the wireshark dissector 944 * that can make sense of the data stored. 945 */ 946 #define LINKTYPE_WIRESHARK_UPPER_PDU 252 947 948 /* 949 * Link-layer header type for the netlink protocol (nlmon devices). 950 */ 951 #define LINKTYPE_NETLINK 253 952 953 /* 954 * Bluetooth Linux Monitor headers for the BlueZ stack. 955 */ 956 #define LINKTYPE_BLUETOOTH_LINUX_MONITOR 254 957 958 /* 959 * Bluetooth Basic Rate/Enhanced Data Rate baseband packets, as 960 * captured by Ubertooth. 961 */ 962 #define LINKTYPE_BLUETOOTH_BREDR_BB 255 963 964 /* 965 * Bluetooth Low Energy link layer packets, as captured by Ubertooth. 966 */ 967 #define LINKTYPE_BLUETOOTH_LE_LL_WITH_PHDR 256 968 969 /* 970 * PROFIBUS data link layer. 971 */ 972 #define LINKTYPE_PROFIBUS_DL 257 973 974 /* 975 * Apple's DLT_PKTAP headers. 976 * 977 * Sadly, the folks at Apple either had no clue that the DLT_USERn values 978 * are for internal use within an organization and partners only, and 979 * didn't know that the right way to get a link-layer header type is to 980 * ask tcpdump.org for one, or knew and didn't care, so they just 981 * used DLT_USER2, which causes problems for everything except for 982 * their version of tcpdump. 983 * 984 * So I'll just give them one; hopefully this will show up in a 985 * libpcap release in time for them to get this into 10.10 Big Sur 986 * or whatever Mavericks' successor is called. LINKTYPE_PKTAP 987 * will be 258 *even on OS X*; that is *intentional*, so that 988 * PKTAP files look the same on *all* OSes (different OSes can have 989 * different numerical values for a given DLT_, but *MUST NOT* have 990 * different values for what goes in a file, as files can be moved 991 * between OSes!). 992 */ 993 #define LINKTYPE_PKTAP 258 994 995 /* 996 * Ethernet packets preceded by a header giving the last 6 octets 997 * of the preamble specified by 802.3-2012 Clause 65, section 998 * 65.1.3.2 "Transmit". 999 */ 1000 #define LINKTYPE_EPON 259 1001 1002 /* 1003 * IPMI trace packets, as specified by Table 3-20 "Trace Data Block Format" 1004 * in the PICMG HPM.2 specification. 1005 */ 1006 #define LINKTYPE_IPMI_HPM_2 260 1007 1008 /* 1009 * per Joshua Wright <jwright@hasborg.com>, formats for Zwave captures. 1010 */ 1011 #define LINKTYPE_ZWAVE_R1_R2 261 1012 #define LINKTYPE_ZWAVE_R3 262 1013 1014 /* 1015 * per Steve Karg <skarg@users.sourceforge.net>, formats for Wattstopper 1016 * Digital Lighting Management room bus serial protocol captures. 1017 */ 1018 #define LINKTYPE_WATTSTOPPER_DLM 263 1019 1020 /* 1021 * ISO 14443 contactless smart card messages. 1022 */ 1023 #define LINKTYPE_ISO_14443 264 1024 1025 /* 1026 * Radio data system (RDS) groups. IEC 62106. 1027 * Per Jonathan Brucker <jonathan.brucke@gmail.com>. 1028 */ 1029 #define LINKTYPE_RDS 265 1030 1031 #define LINKTYPE_MATCHING_MAX 265 /* highest value in the "matching" range */ 1032 1033 static struct linktype_map { 1034 int dlt; 1035 int linktype; 1036 } map[] = { 1037 /* 1038 * These DLT_* codes have LINKTYPE_* codes with values identical 1039 * to the values of the corresponding DLT_* code. 1040 */ 1041 { DLT_NULL, LINKTYPE_NULL }, 1042 { DLT_EN10MB, LINKTYPE_ETHERNET }, 1043 { DLT_EN3MB, LINKTYPE_EXP_ETHERNET }, 1044 { DLT_AX25, LINKTYPE_AX25 }, 1045 { DLT_PRONET, LINKTYPE_PRONET }, 1046 { DLT_CHAOS, LINKTYPE_CHAOS }, 1047 { DLT_IEEE802, LINKTYPE_IEEE802_5 }, 1048 { DLT_ARCNET, LINKTYPE_ARCNET_BSD }, 1049 { DLT_SLIP, LINKTYPE_SLIP }, 1050 { DLT_PPP, LINKTYPE_PPP }, 1051 { DLT_FDDI, LINKTYPE_FDDI }, 1052 { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL }, 1053 1054 /* 1055 * These DLT_* codes have different values on different 1056 * platforms; we map them to LINKTYPE_* codes that 1057 * have values that should never be equal to any DLT_* 1058 * code. 1059 */ 1060 #ifdef DLT_FR 1061 /* BSD/OS Frame Relay */ 1062 { DLT_FR, LINKTYPE_FRELAY }, 1063 #endif 1064 1065 { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 }, 1066 { DLT_RAW, LINKTYPE_RAW }, 1067 { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS }, 1068 { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS }, 1069 1070 /* BSD/OS Cisco HDLC */ 1071 { DLT_C_HDLC, LINKTYPE_C_HDLC }, 1072 1073 /* 1074 * These DLT_* codes are not on all platforms, but, so far, 1075 * there don't appear to be any platforms that define 1076 * other codes with those values; we map them to 1077 * different LINKTYPE_* values anyway, just in case. 1078 */ 1079 1080 /* Linux ATM Classical IP */ 1081 { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP }, 1082 1083 /* NetBSD sync/async serial PPP (or Cisco HDLC) */ 1084 { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC }, 1085 1086 /* NetBSD PPP over Ethernet */ 1087 { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER }, 1088 1089 /* 1090 * All LINKTYPE_ values between LINKTYPE_MATCHING_MIN 1091 * and LINKTYPE_MATCHING_MAX are mapped to identical 1092 * DLT_ values. 1093 */ 1094 1095 { -1, -1 } 1096 }; 1097 1098 int 1099 dlt_to_linktype(int dlt) 1100 { 1101 int i; 1102 1103 /* 1104 * DLTs that, on some platforms, have values in the matching range 1105 * but that *don't* have the same value as the corresponding 1106 * LINKTYPE because, for some reason, not all OSes have the 1107 * same value for that DLT (note that the DLT's value might be 1108 * outside the matching range on some of those OSes). 1109 */ 1110 if (dlt == DLT_PFSYNC) 1111 return (LINKTYPE_PFSYNC); 1112 if (dlt == DLT_PKTAP) 1113 return (LINKTYPE_PKTAP); 1114 1115 /* 1116 * For all other values in the matching range, the DLT 1117 * value is the same as the LINKTYPE value. 1118 */ 1119 if (dlt >= DLT_MATCHING_MIN && dlt <= DLT_MATCHING_MAX) 1120 return (dlt); 1121 1122 /* 1123 * Map the values outside that range. 1124 */ 1125 for (i = 0; map[i].dlt != -1; i++) { 1126 if (map[i].dlt == dlt) 1127 return (map[i].linktype); 1128 } 1129 1130 /* 1131 * If we don't have a mapping for this DLT, return an 1132 * error; that means that this is a value with no corresponding 1133 * LINKTYPE, and we need to assign one. 1134 */ 1135 return (-1); 1136 } 1137 1138 int 1139 linktype_to_dlt(int linktype) 1140 { 1141 int i; 1142 1143 /* 1144 * LINKTYPEs in the matching range that *don't* 1145 * have the same value as the corresponding DLTs 1146 * because, for some reason, not all OSes have the 1147 * same value for that DLT. 1148 */ 1149 if (linktype == LINKTYPE_PFSYNC) 1150 return (DLT_PFSYNC); 1151 if (linktype == LINKTYPE_PKTAP) 1152 return (DLT_PKTAP); 1153 1154 /* 1155 * For all other values in the matching range, the LINKTYPE 1156 * value is the same as the DLT value. 1157 */ 1158 if (linktype >= LINKTYPE_MATCHING_MIN && 1159 linktype <= LINKTYPE_MATCHING_MAX) 1160 return (linktype); 1161 1162 /* 1163 * Map the values outside that range. 1164 */ 1165 for (i = 0; map[i].linktype != -1; i++) { 1166 if (map[i].linktype == linktype) 1167 return (map[i].dlt); 1168 } 1169 1170 /* 1171 * If we don't have an entry for this LINKTYPE, return 1172 * the link type value; it may be a DLT from an older 1173 * version of libpcap. 1174 */ 1175 return linktype; 1176 } 1177 1178 #define EXTRACT_ 1179 1180 /* 1181 * DLT_LINUX_SLL packets with a protocol type of LINUX_SLL_P_CAN or 1182 * LINUX_SLL_P_CANFD have SocketCAN headers in front of the payload, 1183 * with the CAN ID being in host byte order. 1184 * 1185 * When reading a DLT_LINUX_SLL capture file, we need to check for those 1186 * packets and convert the CAN ID from the byte order of the host that 1187 * wrote the file to this host's byte order. 1188 */ 1189 static void 1190 swap_linux_sll_header(const struct pcap_pkthdr *hdr, u_char *buf) 1191 { 1192 u_int caplen = hdr->caplen; 1193 u_int length = hdr->len; 1194 struct sll_header *shdr = (struct sll_header *)buf; 1195 u_int16_t protocol; 1196 pcap_can_socketcan_hdr *chdr; 1197 1198 if (caplen < (u_int) sizeof(struct sll_header) || 1199 length < (u_int) sizeof(struct sll_header)) { 1200 /* Not enough data to have the protocol field */ 1201 return; 1202 } 1203 1204 protocol = EXTRACT_16BITS(&shdr->sll_protocol); 1205 if (protocol != LINUX_SLL_P_CAN && protocol != LINUX_SLL_P_CANFD) 1206 return; 1207 1208 /* 1209 * SocketCAN packet; fix up the packet's header. 1210 */ 1211 chdr = (pcap_can_socketcan_hdr *)(buf + sizeof(struct sll_header)); 1212 if (caplen < (u_int) sizeof(struct sll_header) + sizeof(chdr->can_id) || 1213 length < (u_int) sizeof(struct sll_header) + sizeof(chdr->can_id)) { 1214 /* Not enough data to have the CAN ID */ 1215 return; 1216 } 1217 chdr->can_id = SWAPLONG(chdr->can_id); 1218 } 1219 1220 /* 1221 * The DLT_USB_LINUX and DLT_USB_LINUX_MMAPPED headers are in host 1222 * byte order when capturing (it's supplied directly from a 1223 * memory-mapped buffer shared by the kernel). 1224 * 1225 * When reading a DLT_USB_LINUX or DLT_USB_LINUX_MMAPPED capture file, 1226 * we need to convert it from the byte order of the host that wrote 1227 * the file to this host's byte order. 1228 */ 1229 static void 1230 swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf, 1231 int header_len_64_bytes) 1232 { 1233 pcap_usb_header_mmapped *uhdr = (pcap_usb_header_mmapped *)buf; 1234 bpf_u_int32 offset = 0; 1235 1236 /* 1237 * "offset" is the offset *past* the field we're swapping; 1238 * we skip the field *before* checking to make sure 1239 * the captured data length includes the entire field. 1240 */ 1241 1242 /* 1243 * The URB id is a totally opaque value; do we really need to 1244 * convert it to the reading host's byte order??? 1245 */ 1246 offset += 8; /* skip past id */ 1247 if (hdr->caplen < offset) 1248 return; 1249 uhdr->id = SWAPLL(uhdr->id); 1250 1251 offset += 4; /* skip past various 1-byte fields */ 1252 1253 offset += 2; /* skip past bus_id */ 1254 if (hdr->caplen < offset) 1255 return; 1256 uhdr->bus_id = SWAPSHORT(uhdr->bus_id); 1257 1258 offset += 2; /* skip past various 1-byte fields */ 1259 1260 offset += 8; /* skip past ts_sec */ 1261 if (hdr->caplen < offset) 1262 return; 1263 uhdr->ts_sec = SWAPLL(uhdr->ts_sec); 1264 1265 offset += 4; /* skip past ts_usec */ 1266 if (hdr->caplen < offset) 1267 return; 1268 uhdr->ts_usec = SWAPLONG(uhdr->ts_usec); 1269 1270 offset += 4; /* skip past status */ 1271 if (hdr->caplen < offset) 1272 return; 1273 uhdr->status = SWAPLONG(uhdr->status); 1274 1275 offset += 4; /* skip past urb_len */ 1276 if (hdr->caplen < offset) 1277 return; 1278 uhdr->urb_len = SWAPLONG(uhdr->urb_len); 1279 1280 offset += 4; /* skip past data_len */ 1281 if (hdr->caplen < offset) 1282 return; 1283 uhdr->data_len = SWAPLONG(uhdr->data_len); 1284 1285 if (uhdr->transfer_type == URB_ISOCHRONOUS) { 1286 offset += 4; /* skip past s.iso.error_count */ 1287 if (hdr->caplen < offset) 1288 return; 1289 uhdr->s.iso.error_count = SWAPLONG(uhdr->s.iso.error_count); 1290 1291 offset += 4; /* skip past s.iso.numdesc */ 1292 if (hdr->caplen < offset) 1293 return; 1294 uhdr->s.iso.numdesc = SWAPLONG(uhdr->s.iso.numdesc); 1295 } else 1296 offset += 8; /* skip USB setup header */ 1297 1298 /* 1299 * With the old header, there are no isochronous descriptors 1300 * after the header. 1301 * 1302 * With the new header, the actual number of descriptors in 1303 * the header is not s.iso.numdesc, it's ndesc - only the 1304 * first N descriptors, for some value of N, are put into 1305 * the header, and ndesc is set to the actual number copied. 1306 * In addition, if s.iso.numdesc is negative, no descriptors 1307 * are captured, and ndesc is set to 0. 1308 */ 1309 if (header_len_64_bytes) { 1310 /* 1311 * This is either the "version 1" header, with 1312 * 16 bytes of additional fields at the end, or 1313 * a "version 0" header from a memory-mapped 1314 * capture, with 16 bytes of zeroed-out padding 1315 * at the end. Byte swap them as if this were 1316 * a "version 1" header. 1317 */ 1318 offset += 4; /* skip past interval */ 1319 if (hdr->caplen < offset) 1320 return; 1321 uhdr->interval = SWAPLONG(uhdr->interval); 1322 1323 offset += 4; /* skip past start_frame */ 1324 if (hdr->caplen < offset) 1325 return; 1326 uhdr->start_frame = SWAPLONG(uhdr->start_frame); 1327 1328 offset += 4; /* skip past xfer_flags */ 1329 if (hdr->caplen < offset) 1330 return; 1331 uhdr->xfer_flags = SWAPLONG(uhdr->xfer_flags); 1332 1333 offset += 4; /* skip past ndesc */ 1334 if (hdr->caplen < offset) 1335 return; 1336 uhdr->ndesc = SWAPLONG(uhdr->ndesc); 1337 1338 if (uhdr->transfer_type == URB_ISOCHRONOUS) { 1339 /* swap the values in struct linux_usb_isodesc */ 1340 usb_isodesc *pisodesc; 1341 u_int32_t i; 1342 1343 pisodesc = (usb_isodesc *)(void *)(buf+offset); 1344 for (i = 0; i < uhdr->ndesc; i++) { 1345 offset += 4; /* skip past status */ 1346 if (hdr->caplen < offset) 1347 return; 1348 pisodesc->status = SWAPLONG(pisodesc->status); 1349 1350 offset += 4; /* skip past offset */ 1351 if (hdr->caplen < offset) 1352 return; 1353 pisodesc->offset = SWAPLONG(pisodesc->offset); 1354 1355 offset += 4; /* skip past len */ 1356 if (hdr->caplen < offset) 1357 return; 1358 pisodesc->len = SWAPLONG(pisodesc->len); 1359 1360 offset += 4; /* skip past padding */ 1361 1362 pisodesc++; 1363 } 1364 } 1365 } 1366 } 1367 1368 /* 1369 * The DLT_NFLOG "packets" have a mixture of big-endian and host-byte-order 1370 * data. They begin with a fixed-length header with big-endian fields, 1371 * followed by a set of TLVs, where the type and length are in host 1372 * byte order but the values are either big-endian or are a raw byte 1373 * sequence that's the same regardless of the host's byte order. 1374 * 1375 * When reading a DLT_NFLOG capture file, we need to convert the type 1376 * and length values from the byte order of the host that wrote the 1377 * file to the byte order of this host. 1378 */ 1379 static void 1380 swap_nflog_header(const struct pcap_pkthdr *hdr, u_char *buf) 1381 { 1382 u_char *p = buf; 1383 nflog_hdr_t *nfhdr = (nflog_hdr_t *)buf; 1384 nflog_tlv_t *tlv; 1385 u_int caplen = hdr->caplen; 1386 u_int length = hdr->len; 1387 u_int16_t size; 1388 1389 if (caplen < (u_int) sizeof(nflog_hdr_t) || 1390 length < (u_int) sizeof(nflog_hdr_t)) { 1391 /* Not enough data to have any TLVs. */ 1392 return; 1393 } 1394 1395 if (nfhdr->nflog_version != 0) { 1396 /* Unknown NFLOG version */ 1397 return; 1398 } 1399 1400 length -= sizeof(nflog_hdr_t); 1401 caplen -= sizeof(nflog_hdr_t); 1402 p += sizeof(nflog_hdr_t); 1403 1404 while (caplen >= sizeof(nflog_tlv_t)) { 1405 tlv = (nflog_tlv_t *) p; 1406 1407 /* Swap the type and length. */ 1408 tlv->tlv_type = SWAPSHORT(tlv->tlv_type); 1409 tlv->tlv_length = SWAPSHORT(tlv->tlv_length); 1410 1411 /* Get the length of the TLV. */ 1412 size = tlv->tlv_length; 1413 if (size % 4 != 0) 1414 size += 4 - size % 4; 1415 1416 /* Is the TLV's length less than the minimum? */ 1417 if (size < sizeof(nflog_tlv_t)) { 1418 /* Yes. Give up now. */ 1419 return; 1420 } 1421 1422 /* Do we have enough data for the full TLV? */ 1423 if (caplen < size || length < size) { 1424 /* No. */ 1425 return; 1426 } 1427 1428 /* Skip over the TLV. */ 1429 length -= size; 1430 caplen -= size; 1431 p += size; 1432 } 1433 } 1434 1435 void 1436 swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr, u_char *data) 1437 { 1438 /* 1439 * Convert pseudo-headers from the byte order of 1440 * the host on which the file was saved to our 1441 * byte order, as necessary. 1442 */ 1443 switch (linktype) { 1444 1445 case DLT_LINUX_SLL: 1446 swap_linux_sll_header(hdr, data); 1447 break; 1448 1449 case DLT_USB_LINUX: 1450 swap_linux_usb_header(hdr, data, 0); 1451 break; 1452 1453 case DLT_USB_LINUX_MMAPPED: 1454 swap_linux_usb_header(hdr, data, 1); 1455 break; 1456 1457 case DLT_NFLOG: 1458 swap_nflog_header(hdr, data); 1459 break; 1460 } 1461 } 1462