/* $NetBSD: pcap-common.c,v 1.9 2024/09/02 15:33:37 christos Exp $ */ /* * Copyright (c) 1993, 1994, 1995, 1996, 1997 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * pcap-common.c - common code for pcap and pcapng files */ #include __RCSID("$NetBSD: pcap-common.c,v 1.9 2024/09/02 15:33:37 christos Exp $"); #include #include #include "pcap-int.h" #include "pcap-common.h" /* * We don't write DLT_* values to capture files, because they're not the * same on all platforms. * * Unfortunately, the various flavors of BSD have not always used the same * numerical values for the same data types, and various patches to * libpcap for non-BSD OSes have added their own DLT_* codes for link * layer encapsulation types seen on those OSes, and those codes have had, * in some cases, values that were also used, on other platforms, for other * link layer encapsulation types. * * This means that capture files of a type whose numerical DLT_* code * means different things on different BSDs, or with different versions * of libpcap, can't always be read on systems other than those like * the one running on the machine on which the capture was made. * * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_* * codes to DLT_* codes when reading a savefile header. * * For those DLT_* codes that have, as far as we know, the same values on * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as * DLT_xxx; that way, captures of those types can still be read by * versions of libpcap that map LINKTYPE_* values to DLT_* values, and * captures of those types written by versions of libpcap that map DLT_ * values to LINKTYPE_ values can still be read by older versions * of libpcap. * * The other LINKTYPE_* codes are given values starting at 100, in the * hopes that no DLT_* code will be given one of those values. * * In order to ensure that a given LINKTYPE_* code's value will refer to * the same encapsulation type on all platforms, you should not allocate * a new LINKTYPE_* value without consulting * "tcpdump-workers@lists.tcpdump.org". The tcpdump developers will * allocate a value for you, and will not subsequently allocate it to * anybody else; that value will be added to the "pcap.h" in the * tcpdump.org Git repository, so that a future libpcap release will * include it. * * You should, if possible, also contribute patches to libpcap and tcpdump * to handle the new encapsulation type, so that they can also be checked * into the tcpdump.org Git repository and so that they will appear in * future libpcap and tcpdump releases. * * Do *NOT* assume that any values after the largest value in this file * are available; you might not have the most up-to-date version of this * file, and new values after that one might have been assigned. Also, * do *NOT* use any values below 100 - those might already have been * taken by one (or more!) organizations. * * Any platform that defines additional DLT_* codes should: * * request a LINKTYPE_* code and value from tcpdump.org, * as per the above; * * add, in their version of libpcap, an entry to map * those DLT_* codes to the corresponding LINKTYPE_* * code; * * redefine, in their "net/bpf.h", any DLT_* values * that collide with the values used by their additional * DLT_* codes, to remove those collisions (but without * making them collide with any of the LINKTYPE_* * values equal to 50 or above; they should also avoid * defining DLT_* values that collide with those * LINKTYPE_* values, either). */ /* * These values the DLT_ values for which are the same on all platforms, * and that have been defined by for ages. * * For those, the LINKTYPE_ values are equal to the DLT_ values. * * LINKTYPE_LOW_MATCHING_MIN is the lowest such value; * LINKTYPE_LOW_MATCHING_MAX is the highest such value. */ #define LINKTYPE_LOW_MATCHING_MIN 0 /* lowest value in this "matching" range */ #define LINKTYPE_NULL DLT_NULL #define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */ #define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */ #define LINKTYPE_AX25 DLT_AX25 #define LINKTYPE_PRONET DLT_PRONET #define LINKTYPE_CHAOS DLT_CHAOS #define LINKTYPE_IEEE802_5 DLT_IEEE802 /* DLT_IEEE802 is used for 802.5 Token Ring */ #define LINKTYPE_ARCNET_BSD DLT_ARCNET /* BSD-style headers */ #define LINKTYPE_SLIP DLT_SLIP #define LINKTYPE_PPP DLT_PPP #define LINKTYPE_FDDI DLT_FDDI #define LINKTYPE_LOW_MATCHING_MAX LINKTYPE_FDDI /* highest value in this "matching" range */ /* * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662 * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol * field) at the beginning of the packet. * * This is for use when there is always such a header; the address field * might be 0xff, for regular PPP, or it might be an address field for Cisco * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL. * * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL * captures will be written out with a link type that NetBSD's tcpdump * can read. */ #define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */ #define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */ #define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */ /* * These correspond to DLT_s that have different values on different * platforms; we map between these values in capture files and * the DLT_ values as returned by pcap_datalink() and passed to * pcap_open_dead(). */ #define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */ #define LINKTYPE_RAW 101 /* raw IP */ #define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */ #define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */ /* * Values starting with 104 are used for newly-assigned link-layer * header type values; for those link-layer header types, the DLT_ * value returned by pcap_datalink() and passed to pcap_open_dead(), * and the LINKTYPE_ value that appears in capture files, are the * same. * * LINKTYPE_HIGH_MATCHING_MIN is the lowest such value; * LINKTYPE_HIGH_MATCHING_MAX is the highest such value. */ #define LINKTYPE_HIGH_MATCHING_MIN 104 /* lowest value in the "matching" range */ #define LINKTYPE_C_HDLC 104 /* Cisco HDLC */ #define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */ #define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */ #define LINKTYPE_FRELAY 107 /* Frame Relay */ #define LINKTYPE_LOOP 108 /* OpenBSD loopback */ #define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */ /* * These two types are reserved for future use. */ #define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */ #define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */ /* * Used for NetBSD DLT_HDLC; from looking at the one driver in NetBSD * that uses it, it's Cisco HDLC, so it's the same as DLT_C_HDLC/ * LINKTYPE_C_HDLC, but we define a separate value to avoid some * compatibility issues with programs on NetBSD. * * All code should treat LINKTYPE_NETBSD_HDLC and LINKTYPE_C_HDLC the same. */ #define LINKTYPE_NETBSD_HDLC 112 /* NetBSD HDLC framing */ #define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */ #define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */ #define LINKTYPE_ECONET 115 /* Acorn Econet */ /* * Reserved for use with OpenBSD ipfilter. */ #define LINKTYPE_IPFILTER 116 #define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */ #define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */ #define LINKTYPE_IEEE802_11_PRISM 119 /* 802.11 plus Prism II monitor mode radio metadata header */ #define LINKTYPE_IEEE802_11_AIRONET 120 /* 802.11 plus FreeBSD Aironet driver radio metadata header */ /* * Reserved for Siemens HiPath HDLC. */ #define LINKTYPE_HHDLC 121 #define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */ #define LINKTYPE_SUNATM 123 /* Solaris+SunATM */ /* * Reserved as per request from Kent Dahlgren * for private use. */ #define LINKTYPE_RIO 124 /* RapidIO */ #define LINKTYPE_PCI_EXP 125 /* PCI Express */ #define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */ #define LINKTYPE_IEEE802_11_RADIOTAP 127 /* 802.11 plus radiotap radio metadata header */ /* * Reserved for the TZSP encapsulation, as per request from * Chris Waters * TZSP is a generic encapsulation for any other link type, * which includes a means to include meta-information * with the packet, e.g. signal strength and channel * for 802.11 packets. */ #define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */ #define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */ /* * Juniper-private data link types, as per request from * Hannes Gredler . The corresponding * DLT_s are used for passing on chassis-internal * metainformation such as QOS profiles, etc.. */ #define LINKTYPE_JUNIPER_MLPPP 130 #define LINKTYPE_JUNIPER_MLFR 131 #define LINKTYPE_JUNIPER_ES 132 #define LINKTYPE_JUNIPER_GGSN 133 #define LINKTYPE_JUNIPER_MFR 134 #define LINKTYPE_JUNIPER_ATM2 135 #define LINKTYPE_JUNIPER_SERVICES 136 #define LINKTYPE_JUNIPER_ATM1 137 #define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */ #define LINKTYPE_MTP2_WITH_PHDR 139 #define LINKTYPE_MTP2 140 #define LINKTYPE_MTP3 141 #define LINKTYPE_SCCP 142 #define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */ #define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */ /* * Reserved for IBM SP switch and IBM Next Federation switch. */ #define LINKTYPE_IBM_SP 145 #define LINKTYPE_IBM_SN 146 /* * Reserved for private use. If you have some link-layer header type * that you want to use within your organization, with the capture files * using that link-layer header type not ever be sent outside your * organization, you can use these values. * * No libpcap release will use these for any purpose, nor will any * tcpdump release use them, either. * * Do *NOT* use these in capture files that you expect anybody not using * your private versions of capture-file-reading tools to read; in * particular, do *NOT* use them in products, otherwise you may find that * people won't be able to use tcpdump, or snort, or Ethereal, or... to * read capture files from your firewall/intrusion detection/traffic * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value, * and you may also find that the developers of those applications will * not accept patches to let them read those files. * * Also, do not use them if somebody might send you a capture using them * for *their* private type and tools using them for *your* private type * would have to read them. * * Instead, in those cases, ask "tcpdump-workers@lists.tcpdump.org" for a * new DLT_ and LINKTYPE_ value, as per the comment in pcap/bpf.h, and use * the type you're given. */ #define LINKTYPE_USER0 147 #define LINKTYPE_USER1 148 #define LINKTYPE_USER2 149 #define LINKTYPE_USER3 150 #define LINKTYPE_USER4 151 #define LINKTYPE_USER5 152 #define LINKTYPE_USER6 153 #define LINKTYPE_USER7 154 #define LINKTYPE_USER8 155 #define LINKTYPE_USER9 156 #define LINKTYPE_USER10 157 #define LINKTYPE_USER11 158 #define LINKTYPE_USER12 159 #define LINKTYPE_USER13 160 #define LINKTYPE_USER14 161 #define LINKTYPE_USER15 162 /* * For future use with 802.11 captures - defined by AbsoluteValue * Systems to store a number of bits of link-layer information * including radio information: * * http://www.shaftnet.org/~pizza/software/capturefrm.txt */ #define LINKTYPE_IEEE802_11_AVS 163 /* 802.11 plus AVS radio metadata header */ /* * Juniper-private data link type, as per request from * Hannes Gredler . The corresponding * DLT_s are used for passing on chassis-internal * metainformation such as QOS profiles, etc.. */ #define LINKTYPE_JUNIPER_MONITOR 164 /* * BACnet MS/TP frames. */ #define LINKTYPE_BACNET_MS_TP 165 /* * Another PPP variant as per request from Karsten Keil . * * This is used in some OSes to allow a kernel socket filter to distinguish * between incoming and outgoing packets, on a socket intended to * supply pppd with outgoing packets so it can do dial-on-demand and * hangup-on-lack-of-demand; incoming packets are filtered out so they * don't cause pppd to hold the connection up (you don't want random * input packets such as port scans, packets from old lost connections, * etc. to force the connection to stay up). * * The first byte of the PPP header (0xff03) is modified to accommodate * the direction - 0x00 = IN, 0x01 = OUT. */ #define LINKTYPE_PPP_PPPD 166 /* * Juniper-private data link type, as per request from * Hannes Gredler . The DLT_s are used * for passing on chassis-internal metainformation such as * QOS profiles, cookies, etc.. */ #define LINKTYPE_JUNIPER_PPPOE 167 #define LINKTYPE_JUNIPER_PPPOE_ATM 168 #define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */ #define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */ #define LINKTYPE_GPF_F 171 /* GPF-F (ITU-T G.7041/Y.1303) */ /* * Requested by Oolan Zimmer for use in Gcom's T1/E1 line * monitoring equipment. */ #define LINKTYPE_GCOM_T1E1 172 #define LINKTYPE_GCOM_SERIAL 173 /* * Juniper-private data link type, as per request from * Hannes Gredler . The DLT_ is used * for internal communication to Physical Interface Cards (PIC) */ #define LINKTYPE_JUNIPER_PIC_PEER 174 /* * Link types requested by Gregor Maier of Endace * Measurement Systems. They add an ERF header (see * https://www.endace.com/support/EndaceRecordFormat.pdf) in front of * the link-layer header. */ #define LINKTYPE_ERF_ETH 175 /* Ethernet */ #define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */ /* * Requested by Daniele Orlandi for raw LAPD * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header * includes additional information before the LAPD header, so it's * not necessarily a generic LAPD header. */ #define LINKTYPE_LINUX_LAPD 177 /* * Juniper-private data link type, as per request from * Hannes Gredler . * The Link Types are used for prepending meta-information * like interface index, interface name * before standard Ethernet, PPP, Frelay & C-HDLC Frames */ #define LINKTYPE_JUNIPER_ETHER 178 #define LINKTYPE_JUNIPER_PPP 179 #define LINKTYPE_JUNIPER_FRELAY 180 #define LINKTYPE_JUNIPER_CHDLC 181 /* * Multi Link Frame Relay (FRF.16) */ #define LINKTYPE_MFR 182 /* * Juniper-private data link type, as per request from * Hannes Gredler . * The DLT_ is used for internal communication with a * voice Adapter Card (PIC) */ #define LINKTYPE_JUNIPER_VP 183 /* * Arinc 429 frames. * DLT_ requested by Gianluca Varenni . * Every frame contains a 32bit A429 label. * More documentation on Arinc 429 can be found at * https://web.archive.org/web/20040616233302/https://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf */ #define LINKTYPE_A429 184 /* * Arinc 653 Interpartition Communication messages. * DLT_ requested by Gianluca Varenni . * Please refer to the A653-1 standard for more information. */ #define LINKTYPE_A653_ICM 185 /* * This used to be "USB packets, beginning with a USB setup header; * requested by Paolo Abeni ." * * However, that header didn't work all that well - it left out some * useful information - and was abandoned in favor of the DLT_USB_LINUX * header. * * This is now used by FreeBSD for its BPF taps for USB; that has its * own headers. So it is written, so it is done. */ #define LINKTYPE_USB_FREEBSD 186 /* * Bluetooth HCI UART transport layer (part H:4); requested by * Paolo Abeni. */ #define LINKTYPE_BLUETOOTH_HCI_H4 187 /* * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz * . */ #define LINKTYPE_IEEE802_16_MAC_CPS 188 /* * USB packets, beginning with a Linux USB header; requested by * Paolo Abeni . */ #define LINKTYPE_USB_LINUX 189 /* * Controller Area Network (CAN) v. 2.0B packets. * DLT_ requested by Gianluca Varenni . * Used to dump CAN packets coming from a CAN Vector board. * More documentation on the CAN v2.0B frames can be found at * http://www.can-cia.org/downloads/?269 */ #define LINKTYPE_CAN20B 190 /* * IEEE 802.15.4, with address fields padded, as is done by Linux * drivers; requested by Juergen Schimmer. */ #define LINKTYPE_IEEE802_15_4_LINUX 191 /* * Per Packet Information encapsulated packets. * LINKTYPE_ requested by Gianluca Varenni . */ #define LINKTYPE_PPI 192 /* * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header; * requested by Charles Clancy. */ #define LINKTYPE_IEEE802_16_MAC_CPS_RADIO 193 /* * Juniper-private data link type, as per request from * Hannes Gredler . * The DLT_ is used for internal communication with a * integrated service module (ISM). */ #define LINKTYPE_JUNIPER_ISM 194 /* * IEEE 802.15.4, exactly as it appears in the spec (no padding, no * nothing), and with the FCS at the end of the frame; requested by * Mikko Saarnivala . * * This should only be used if the FCS is present at the end of the * frame; if the frame has no FCS, DLT_IEEE802_15_4_NOFCS should be * used. */ #define LINKTYPE_IEEE802_15_4_WITHFCS 195 /* * Various link-layer types, with a pseudo-header, for SITA * (https://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com). */ #define LINKTYPE_SITA 196 /* * Various link-layer types, with a pseudo-header, for Endace DAG cards; * encapsulates Endace ERF records. Requested by Stephen Donnelly * . */ #define LINKTYPE_ERF 197 /* * Special header prepended to Ethernet packets when capturing from a * u10 Networks board. Requested by Phil Mulholland * . */ #define LINKTYPE_RAIF1 198 /* * IPMB packet for IPMI, beginning with a 2-byte header, followed by * the I2C slave address, followed by the netFn and LUN, etc.. * Requested by Chanthy Toeung . * * XXX - its DLT_ value used to be called DLT_IPMB, back when we got the * impression from the email thread requesting it that the packet * had no extra 2-byte header. We've renamed it; if anybody used * DLT_IPMB and assumed no 2-byte header, this will cause the compile * to fail, at which point we'll have to figure out what to do about * the two header types using the same DLT_/LINKTYPE_ value. If that * doesn't happen, we'll assume nobody used it and that the redefinition * is safe. */ #define LINKTYPE_IPMB_KONTRON 199 /* * Juniper-private data link type, as per request from * Hannes Gredler . * The DLT_ is used for capturing data on a secure tunnel interface. */ #define LINKTYPE_JUNIPER_ST 200 /* * Bluetooth HCI UART transport layer (part H:4), with pseudo-header * that includes direction information; requested by Paolo Abeni. */ #define LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR 201 /* * AX.25 packet with a 1-byte KISS header; see * * http://www.ax25.net/kiss.htm * * as per Richard Stearn . */ #define LINKTYPE_AX25_KISS 202 /* * LAPD packets from an ISDN channel, starting with the address field, * with no pseudo-header. * Requested by Varuna De Silva . */ #define LINKTYPE_LAPD 203 /* * PPP, with a one-byte direction pseudo-header prepended - zero means * "received by this host", non-zero (any non-zero value) means "sent by * this host" - as per Will Barker . */ #define LINKTYPE_PPP_WITH_DIR 204 /* Don't confuse with LINKTYPE_PPP_PPPD */ /* * Cisco HDLC, with a one-byte direction pseudo-header prepended - zero * means "received by this host", non-zero (any non-zero value) means * "sent by this host" - as per Will Barker . */ #define LINKTYPE_C_HDLC_WITH_DIR 205 /* Cisco HDLC */ /* * Frame Relay, with a one-byte direction pseudo-header prepended - zero * means "received by this host" (DCE -> DTE), non-zero (any non-zero * value) means "sent by this host" (DTE -> DCE) - as per Will Barker * . */ #define LINKTYPE_FRELAY_WITH_DIR 206 /* Frame Relay */ /* * LAPB, with a one-byte direction pseudo-header prepended - zero means * "received by this host" (DCE -> DTE), non-zero (any non-zero value) * means "sent by this host" (DTE -> DCE)- as per Will Barker * . */ #define LINKTYPE_LAPB_WITH_DIR 207 /* LAPB */ /* * 208 is reserved for an as-yet-unspecified proprietary link-layer * type, as requested by Will Barker. */ /* * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman * . */ #define LINKTYPE_IPMB_LINUX 209 /* * FlexRay automotive bus - http://www.flexray.com/ - as requested * by Hannes Kaelber . */ #define LINKTYPE_FLEXRAY 210 /* * Media Oriented Systems Transport (MOST) bus for multimedia * transport - https://www.mostcooperation.com/ - as requested * by Hannes Kaelber . */ #define LINKTYPE_MOST 211 /* * Local Interconnect Network (LIN) bus for vehicle networks - * http://www.lin-subbus.org/ - as requested by Hannes Kaelber * . */ #define LINKTYPE_LIN 212 /* * X2E-private data link type used for serial line capture, * as requested by Hannes Kaelber . */ #define LINKTYPE_X2E_SERIAL 213 /* * X2E-private data link type used for the Xoraya data logger * family, as requested by Hannes Kaelber . */ #define LINKTYPE_X2E_XORAYA 214 /* * IEEE 802.15.4, exactly as it appears in the spec (no padding, no * nothing), but with the PHY-level data for non-ASK PHYs (4 octets * of 0 as preamble, one octet of SFD, one octet of frame length+ * reserved bit, and then the MAC-layer data, starting with the * frame control field). * * Requested by Max Filippov . */ #define LINKTYPE_IEEE802_15_4_NONASK_PHY 215 /* * David Gibson requested this for * captures from the Linux kernel /dev/input/eventN devices. This * is used to communicate keystrokes and mouse movements from the * Linux kernel to display systems, such as Xorg. */ #define LINKTYPE_LINUX_EVDEV 216 /* * GSM Um and Abis interfaces, preceded by a "gsmtap" header. * * Requested by Harald Welte . */ #define LINKTYPE_GSMTAP_UM 217 #define LINKTYPE_GSMTAP_ABIS 218 /* * MPLS, with an MPLS label as the link-layer header. * Requested by Michele Marchetto on behalf * of OpenBSD. */ #define LINKTYPE_MPLS 219 /* * USB packets, beginning with a Linux USB header, with the USB header * padded to 64 bytes; required for memory-mapped access. */ #define LINKTYPE_USB_LINUX_MMAPPED 220 /* * DECT packets, with a pseudo-header; requested by * Matthias Wenzel . */ #define LINKTYPE_DECT 221 /* * From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" * Date: Mon, 11 May 2009 11:18:30 -0500 * * DLT_AOS. We need it for AOS Space Data Link Protocol. * I have already written dissectors for but need an OK from * legal before I can submit a patch. * */ #define LINKTYPE_AOS 222 /* * WirelessHART (Highway Addressable Remote Transducer) * From the HART Communication Foundation * IEC/PAS 62591 * * Requested by Sam Roberts . */ #define LINKTYPE_WIHART 223 /* * Fibre Channel FC-2 frames, beginning with a Frame_Header. * Requested by Kahou Lei . */ #define LINKTYPE_FC_2 224 /* * Fibre Channel FC-2 frames, beginning with an encoding of the * SOF, and ending with an encoding of the EOF. * * The encodings represent the frame delimiters as 4-byte sequences * representing the corresponding ordered sets, with K28.5 * represented as 0xBC, and the D symbols as the corresponding * byte values; for example, SOFi2, which is K28.5 - D21.5 - D1.2 - D21.2, * is represented as 0xBC 0xB5 0x55 0x55. * * Requested by Kahou Lei . */ #define LINKTYPE_FC_2_WITH_FRAME_DELIMS 225 /* * Solaris ipnet pseudo-header; requested by Darren Reed . * * The pseudo-header starts with a one-byte version number; for version 2, * the pseudo-header is: * * struct dl_ipnetinfo { * uint8_t dli_version; * uint8_t dli_family; * uint16_t dli_htype; * uint32_t dli_pktlen; * uint32_t dli_ifindex; * uint32_t dli_grifindex; * uint32_t dli_zsrc; * uint32_t dli_zdst; * }; * * dli_version is 2 for the current version of the pseudo-header. * * dli_family is a Solaris address family value, so it's 2 for IPv4 * and 26 for IPv6. * * dli_htype is a "hook type" - 0 for incoming packets, 1 for outgoing * packets, and 2 for packets arriving from another zone on the same * machine. * * dli_pktlen is the length of the packet data following the pseudo-header * (so the captured length minus dli_pktlen is the length of the * pseudo-header, assuming the entire pseudo-header was captured). * * dli_ifindex is the interface index of the interface on which the * packet arrived. * * dli_grifindex is the group interface index number (for IPMP interfaces). * * dli_zsrc is the zone identifier for the source of the packet. * * dli_zdst is the zone identifier for the destination of the packet. * * A zone number of 0 is the global zone; a zone number of 0xffffffff * means that the packet arrived from another host on the network, not * from another zone on the same machine. * * An IPv4 or IPv6 datagram follows the pseudo-header; dli_family indicates * which of those it is. */ #define LINKTYPE_IPNET 226 /* * CAN (Controller Area Network) frames, with a pseudo-header as supplied * by Linux SocketCAN, and with multi-byte numerical fields in that header * in big-endian byte order. * * See Documentation/networking/can.txt in the Linux source. * * Requested by Felix Obenhuber . */ #define LINKTYPE_CAN_SOCKETCAN 227 /* * Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies * whether it's v4 or v6. Requested by Darren Reed . */ #define LINKTYPE_IPV4 228 #define LINKTYPE_IPV6 229 /* * IEEE 802.15.4, exactly as it appears in the spec (no padding, no * nothing), and with no FCS at the end of the frame; requested by * Jon Smirl . */ #define LINKTYPE_IEEE802_15_4_NOFCS 230 /* * Raw D-Bus: * * https://www.freedesktop.org/wiki/Software/dbus * * messages: * * https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages * * starting with the endianness flag, followed by the message type, etc., * but without the authentication handshake before the message sequence: * * https://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol * * Requested by Martin Vidner . */ #define LINKTYPE_DBUS 231 /* * Juniper-private data link type, as per request from * Hannes Gredler . */ #define LINKTYPE_JUNIPER_VS 232 #define LINKTYPE_JUNIPER_SRX_E2E 233 #define LINKTYPE_JUNIPER_FIBRECHANNEL 234 /* * DVB-CI (DVB Common Interface for communication between a PC Card * module and a DVB receiver). See * * https://www.kaiser.cx/pcap-dvbci.html * * for the specification. * * Requested by Martin Kaiser . */ #define LINKTYPE_DVB_CI 235 /* * Variant of 3GPP TS 27.010 multiplexing protocol. Requested * by Hans-Christoph Schemmel . */ #define LINKTYPE_MUX27010 236 /* * STANAG 5066 D_PDUs. Requested by M. Baris Demiray * . */ #define LINKTYPE_STANAG_5066_D_PDU 237 /* * Juniper-private data link type, as per request from * Hannes Gredler . */ #define LINKTYPE_JUNIPER_ATM_CEMIC 238 /* * NetFilter LOG messages * (payload of netlink NFNL_SUBSYS_ULOG/NFULNL_MSG_PACKET packets) * * Requested by Jakub Zawadzki */ #define LINKTYPE_NFLOG 239 /* * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type * for Ethernet packets with a 4-byte pseudo-header and always * with the payload including the FCS, as supplied by their * netANALYZER hardware and software. * * Requested by Holger P. Frommer */ #define LINKTYPE_NETANALYZER 240 /* * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type * for Ethernet packets with a 4-byte pseudo-header and FCS and * 1 byte of SFD, as supplied by their netANALYZER hardware and * software. * * Requested by Holger P. Frommer */ #define LINKTYPE_NETANALYZER_TRANSPARENT 241 /* * IP-over-InfiniBand, as specified by RFC 4391. * * Requested by Petr Sumbera . */ #define LINKTYPE_IPOIB 242 /* * MPEG-2 transport stream (ISO 13818-1/ITU-T H.222.0). * * Requested by Guy Martin . */ #define LINKTYPE_MPEG_2_TS 243 /* * ng4T GmbH's UMTS Iub/Iur-over-ATM and Iub/Iur-over-IP format as * used by their ng40 protocol tester. * * Requested by Jens Grimmer . */ #define LINKTYPE_NG40 244 /* * Pseudo-header giving adapter number and flags, followed by an NFC * (Near-Field Communications) Logical Link Control Protocol (LLCP) PDU, * as specified by NFC Forum Logical Link Control Protocol Technical * Specification LLCP 1.1. * * Requested by Mike Wakerly . */ #define LINKTYPE_NFC_LLCP 245 /* * pfsync output; DLT_PFSYNC is 18, which collides with DLT_CIP in * SuSE 6.3, on OpenBSD, NetBSD, DragonFly BSD, and macOS, and * is 121, which collides with DLT_HHDLC, in FreeBSD. We pick a * shiny new link-layer header type value that doesn't collide with * anything, in the hopes that future pfsync savefiles, if any, * won't require special hacks to distinguish from other savefiles. */ #define LINKTYPE_PFSYNC 246 /* * Raw InfiniBand packets, starting with the Local Routing Header. * * Requested by Oren Kladnitsky . */ #define LINKTYPE_INFINIBAND 247 /* * SCTP, with no lower-level protocols (i.e., no IPv4 or IPv6). * * Requested by Michael Tuexen . */ #define LINKTYPE_SCTP 248 /* * USB packets, beginning with a USBPcap header. * * Requested by Tomasz Mon */ #define LINKTYPE_USBPCAP 249 /* * Schweitzer Engineering Laboratories "RTAC" product serial-line * packets. * * Requested by Chris Bontje . */ #define LINKTYPE_RTAC_SERIAL 250 /* * Bluetooth Low Energy air interface link-layer packets. * * Requested by Mike Kershaw . */ #define LINKTYPE_BLUETOOTH_LE_LL 251 /* * Link-layer header type for upper-protocol layer PDU saves from wireshark. * * the actual contents are determined by two TAGs, one or more of * which is stored with each packet: * * EXP_PDU_TAG_DISSECTOR_NAME the name of the Wireshark dissector * that can make sense of the data stored. * * EXP_PDU_TAG_HEUR_DISSECTOR_NAME the name of the Wireshark heuristic * dissector that can make sense of the * data stored. */ #define LINKTYPE_WIRESHARK_UPPER_PDU 252 /* * Link-layer header type for the netlink protocol (nlmon devices). */ #define LINKTYPE_NETLINK 253 /* * Bluetooth Linux Monitor headers for the BlueZ stack. */ #define LINKTYPE_BLUETOOTH_LINUX_MONITOR 254 /* * Bluetooth Basic Rate/Enhanced Data Rate baseband packets, as * captured by Ubertooth. */ #define LINKTYPE_BLUETOOTH_BREDR_BB 255 /* * Bluetooth Low Energy link layer packets, as captured by Ubertooth. */ #define LINKTYPE_BLUETOOTH_LE_LL_WITH_PHDR 256 /* * PROFIBUS data link layer. */ #define LINKTYPE_PROFIBUS_DL 257 /* * Apple's DLT_PKTAP headers. * * Sadly, the folks at Apple either had no clue that the DLT_USERn values * are for internal use within an organization and partners only, and * didn't know that the right way to get a link-layer header type is to * ask tcpdump.org for one, or knew and didn't care, so they just * used DLT_USER2, which causes problems for everything except for * their version of tcpdump. * * So I'll just give them one; hopefully this will show up in a * libpcap release in time for them to get this into 10.10 Big Sur * or whatever Mavericks' successor is called. LINKTYPE_PKTAP * will be 258 *even on macOS*; that is *intentional*, so that * PKTAP files look the same on *all* OSes (different OSes can have * different numerical values for a given DLT_, but *MUST NOT* have * different values for what goes in a file, as files can be moved * between OSes!). */ #define LINKTYPE_PKTAP 258 /* * Ethernet packets preceded by a header giving the last 6 octets * of the preamble specified by 802.3-2012 Clause 65, section * 65.1.3.2 "Transmit". */ #define LINKTYPE_EPON 259 /* * IPMI trace packets, as specified by Table 3-20 "Trace Data Block Format" * in the PICMG HPM.2 specification. */ #define LINKTYPE_IPMI_HPM_2 260 /* * per Joshua Wright , formats for Zwave captures. */ #define LINKTYPE_ZWAVE_R1_R2 261 #define LINKTYPE_ZWAVE_R3 262 /* * per Steve Karg , formats for Wattstopper * Digital Lighting Management room bus serial protocol captures. */ #define LINKTYPE_WATTSTOPPER_DLM 263 /* * ISO 14443 contactless smart card messages. */ #define LINKTYPE_ISO_14443 264 /* * Radio data system (RDS) groups. IEC 62106. * Per Jonathan Brucker . */ #define LINKTYPE_RDS 265 /* * USB packets, beginning with a Darwin (macOS, etc.) header. */ #define LINKTYPE_USB_DARWIN 266 /* * OpenBSD DLT_OPENFLOW. */ #define LINKTYPE_OPENFLOW 267 /* * SDLC frames containing SNA PDUs. */ #define LINKTYPE_SDLC 268 /* * per "Selvig, Bjorn" used for * TI protocol sniffer. */ #define LINKTYPE_TI_LLN_SNIFFER 269 /* * per: Erik de Jong for * https://github.com/eriknl/LoRaTap/releases/tag/v0.1 */ #define LINKTYPE_LORATAP 270 /* * per: Stefanha at gmail.com for * https://lists.sandelman.ca/pipermail/tcpdump-workers/2017-May/000772.html * and: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/vsockmon.h * for: https://qemu-project.org/Features/VirtioVsock */ #define LINKTYPE_VSOCK 271 /* * Nordic Semiconductor Bluetooth LE sniffer. */ #define LINKTYPE_NORDIC_BLE 272 /* * Excentis DOCSIS 3.1 RF sniffer (XRA-31) * per: bruno.verstuyft at excentis.com * https://www.xra31.com/xra-header */ #define LINKTYPE_DOCSIS31_XRA31 273 /* * mPackets, as specified by IEEE 802.3br Figure 99-4, starting * with the preamble and always ending with a CRC field. */ #define LINKTYPE_ETHERNET_MPACKET 274 /* * DisplayPort AUX channel monitoring data as specified by VESA * DisplayPort(DP) Standard preceded by a pseudo-header. * per dirk.eibach at gdsys.cc */ #define LINKTYPE_DISPLAYPORT_AUX 275 /* * Linux cooked sockets v2. */ #define LINKTYPE_LINUX_SLL2 276 /* * Sercos Monitor, per Manuel Jacob */ #define LINKTYPE_SERCOS_MONITOR 277 /* * OpenVizsla http://openvizsla.org is open source USB analyzer hardware. * It consists of FPGA with attached USB phy and FTDI chip for streaming * the data to the host PC. * * Current OpenVizsla data encapsulation format is described here: * https://github.com/matwey/libopenvizsla/wiki/OpenVizsla-protocol-description * */ #define LINKTYPE_OPENVIZSLA 278 /* * The Elektrobit High Speed Capture and Replay (EBHSCR) protocol is produced * by a PCIe Card for interfacing high speed automotive interfaces. * * The specification for this frame format can be found at: * https://www.elektrobit.com/ebhscr * * for Guenter.Ebermann at elektrobit.com * */ #define LINKTYPE_EBHSCR 279 /* * The https://fd.io vpp graph dispatch tracer produces pcap trace files * in the format documented here: * https://fdio-vpp.readthedocs.io/en/latest/gettingstarted/developers/vnet.html#graph-dispatcher-pcap-tracing */ #define LINKTYPE_VPP_DISPATCH 280 /* * Broadcom Ethernet switches (ROBO switch) 4 bytes proprietary tagging format. */ #define LINKTYPE_DSA_TAG_BRCM 281 #define LINKTYPE_DSA_TAG_BRCM_PREPEND 282 /* * IEEE 802.15.4 with pseudo-header and optional meta-data TLVs, PHY payload * exactly as it appears in the spec (no padding, no nothing), and FCS if * specified by FCS Type TLV; requested by James Ko . * Specification at https://github.com/jkcko/ieee802.15.4-tap */ #define LINKTYPE_IEEE802_15_4_TAP 283 /* * Marvell (Ethertype) Distributed Switch Architecture proprietary tagging format. */ #define LINKTYPE_DSA_TAG_DSA 284 #define LINKTYPE_DSA_TAG_EDSA 285 /* * Payload of lawful intercept packets using the ELEE protocol; * https://socket.hr/draft-dfranusic-opsawg-elee-00.xml * https://xml2rfc.tools.ietf.org/cgi-bin/xml2rfc.cgi?url=https://socket.hr/draft-dfranusic-opsawg-elee-00.xml&modeAsFormat=html/ascii */ #define LINKTYPE_ELEE 286 /* * Serial frames transmitted between a host and a Z-Wave chip. */ #define LINKTYPE_Z_WAVE_SERIAL 287 /* * USB 2.0, 1.1, and 1.0 packets as transmitted over the cable. */ #define LINKTYPE_USB_2_0 288 /* * ATSC Link-Layer Protocol (A/330) packets. */ #define LINKTYPE_ATSC_ALP 289 #define LINKTYPE_HIGH_MATCHING_MAX 289 /* highest value in the "matching" range */ /* * The DLT_ and LINKTYPE_ values in the "matching" range should be the * same, so DLT_HIGH_MATCHING_MAX and LINKTYPE_HIGH_MATCHING_MAX should be the * same. */ #if LINKTYPE_HIGH_MATCHING_MAX != DLT_HIGH_MATCHING_MAX #error The LINKTYPE_ high matching range does not match the DLT_ matching range #endif /* * Map a DLT_* code to the corresponding LINKTYPE_* code. * Used to generate link-layer types written to savefiles. */ int dlt_to_linktype(int dlt) { /* * All values in the low matching range were handed out before * assigning DLT_* codes became a free-for-all, so they're the * same on all platforms, and thus are given LINKTYPE_* codes * with the same numerical values as the corresponding DLT_* * code. */ if (dlt >= DLT_LOW_MATCHING_MIN && dlt <= DLT_LOW_MATCHING_MAX) return (dlt); #if DLT_PFSYNC != LINKTYPE_PFSYNC /* * DLT_PFSYNC has a code on several platforms that's in the * non-matching range, a code on FreeBSD that's in the high * matching range and that's *not* equal to LINKTYPE_PFSYNC, * and has a code on the rmaining platforms that's equal * to LINKTYPE_PFSYNC, which is in the high matching range. * * Map it to LINKTYPE_PFSYNC if it's not equal to LINKTYPE_PFSYNC. */ if (dlt == DLT_PFSYNC) return (LINKTYPE_PFSYNC); #endif /* * DLT_PKTAP is defined as DLT_USER2 - which is in the high * matching range - on Darwin because Apple used DLT_USER2 * on systems that users ran, not just as an internal thing. * * We map it to LINKTYPE_PKTAP if it's not equal to LINKTYPE_PKTAP * so that DLT_PKTAP captures from Apple machines can be read by * software that either doesn't handle DLT_USER2 or that handles it * as something other than Apple PKTAP. */ #if DLT_PKTAP != LINKTYPE_PKTAP if (dlt == DLT_PKTAP) return (LINKTYPE_PKTAP); #endif /* * For all other DLT_* codes in the high matching range, the DLT * code value is the same as the LINKTYPE_* code value. */ if (dlt >= DLT_HIGH_MATCHING_MIN && dlt <= DLT_HIGH_MATCHING_MAX) return (dlt); /* * These DLT_* codes have different values on different * platforms, so we assigned them LINKTYPE_* codes just * below the lower bound of the high matchig range; * those values should never be equal to any DLT_* * code, so that should avoid collisions. * * That way, for example, "raw IP" packets will have * LINKTYPE_RAW as the code in all savefiles for * which the code that writes them maps to that * value, regardless of the platform on which they * were written, so they should be readable on all * platforms without having to determine on which * platform they were written. * * We map the DLT_* codes on this platform, whatever * it might be, to the corresponding LINKTYPE_* codes. */ if (dlt == DLT_ATM_RFC1483) return (LINKTYPE_ATM_RFC1483); if (dlt == DLT_RAW) return (LINKTYPE_RAW); if (dlt == DLT_SLIP_BSDOS) return (LINKTYPE_SLIP_BSDOS); if (dlt == DLT_PPP_BSDOS) return (LINKTYPE_PPP_BSDOS); /* * These DLT_* codes were originally defined on some platform, * and weren't defined on other platforms. * * At least some of them have values, on at least one platform, * that collide with other DLT_* codes on other platforms, e.g. * DLT_LOOP, so we don't just define them, on all platforms, * as having the same value as on the original platform. * * Therefore, we assigned new LINKTYPE_* codes to them, and, * on the platforms where they weren't originally defined, * define the DLT_* codes to have the same value as the * corresponding LINKTYPE_* codes. * * This means that, for capture files with the original * platform's DLT_* code rather than the LINKTYPE_* code * as a link-layer type, we will recognize those types * on that platform, but not on other platforms. */ #ifdef DLT_FR /* BSD/OS Frame Relay */ if (dlt == DLT_FR) return (LINKTYPE_FRELAY); #endif #if DLT_HDLC != LINKTYPE_NETBSD_HDLC /* NetBSD HDLC */ if (dlt == DLT_HDLC) return (LINKTYPE_NETBSD_HDLC); #endif #if DLT_C_HDLC != LINKTYPE_C_HDLC /* BSD/OS Cisco HDLC */ if (dlt == DLT_C_HDLC) return (LINKTYPE_C_HDLC); #endif #if DLT_LOOP != LINKTYPE_LOOP /* OpenBSD DLT_LOOP */ if (dlt == DLT_LOOP) return (LINKTYPE_LOOP); #endif #if DLT_ENC != LINKTYPE_ENC /* OpenBSD DLT_ENC */ if (dlt == DLT_ENC) return (LINKTYPE_ENC); #endif /* * These DLT_* codes are not on all platforms, but, so far, * there don't appear to be any platforms that define * other codes with those values; we map them to * different LINKTYPE_* codes anyway, just in case. */ /* Linux ATM Classical IP */ if (dlt == DLT_ATM_CLIP) return (LINKTYPE_ATM_CLIP); /* * A few other values, defined on some platforms, not in * either matching range, but not colliding with anything * else, so they're given the same LINKTYPE_* code as * their DLT_* code. */ if (dlt == DLT_REDBACK_SMARTEDGE || dlt == DLT_PPP_SERIAL || dlt == DLT_PPP_ETHER || dlt == DLT_SYMANTEC_FIREWALL) return (dlt); /* * If we don't have a mapping for this DLT_* code, return an * error; that means that this is a DLT_* value with no * corresponding LINKTYPE_ value, and we need to assign one. */ return (-1); } /* * Map a LINKTYPE_* code to the corresponding DLT_* code. * Used to translate link-layer types in savefiles to the * DLT_* codes to provide to callers of libpcap. */ int linktype_to_dlt(int linktype) { /* * All values in the low matching range were handed out before * assigning DLT_* codes became a free-for-all, so they're the * same on all platforms, and are thus used as the LINKTYPE_* * codes in capture files. */ if (linktype >= LINKTYPE_LOW_MATCHING_MIN && linktype <= LINKTYPE_LOW_MATCHING_MAX) return (linktype); #if LINKTYPE_PFSYNC != DLT_PFSYNC /* * DLT_PFSYNC has a code on several platforms that's in the * non-matching range, a code on FreeBSD that's in the high * matching range and that's *not* equal to LINKTYPE_PFSYNC, * and has a code on the rmaining platforms that's equal * to LINKTYPE_PFSYNC, which is in the high matching range. * * Map LINKTYPE_PFSYNC to whatever DLT_PFSYNC is on this * platform, if the two aren't equal. */ if (linktype == LINKTYPE_PFSYNC) return (DLT_PFSYNC); #endif /* * DLT_PKTAP is defined as DLT_USER2 - which is in the high * matching range - on Darwin because Apple used DLT_USER2 * on systems that users ran, not just as an internal thing. * * We map LINKTYPE_PKTAP to the platform's DLT_PKTAP for * the benefit of software that's expecting DLT_PKTAP * (even if that's DLT_USER2) for an Apple PKTAP capture. * * (Yes, this is an annoyance if you want to read a * LINKTYPE_USER2 packet as something other than DLT_PKTAP * on a Darwin-based OS, as, on that OS, DLT_PKTAP and DLT_USER2 * are the same. Feel free to complain to Apple about this.) */ #if LINKTYPE_PKTAP != DLT_PKTAP if (linktype == LINKTYPE_PKTAP) return (DLT_PKTAP); #endif /* * These DLT_* codes have different values on different * platforms, so we assigned them LINKTYPE_* codes just * below the lower bound of the high matchig range; * those values should never be equal to any DLT_* * code, so that should avoid collisions. * * That way, for example, "raw IP" packets will have * LINKTYPE_RAW as the code in all savefiles for * which the code that writes them maps to that * value, regardless of the platform on which they * were written, so they should be readable on all * platforms without having to determine on which * platform they were written. * * We map the LINKTYPE_* codes to the corresponding * DLT_* code on this platform. */ if (linktype == LINKTYPE_ATM_RFC1483) return (DLT_ATM_RFC1483); if (linktype == LINKTYPE_RAW) return (DLT_RAW); if (linktype == LINKTYPE_SLIP_BSDOS) return (DLT_SLIP_BSDOS); if (linktype == LINKTYPE_PPP_BSDOS) return (DLT_PPP_BSDOS); /* * These DLT_* codes were originally defined on some platform, * and weren't defined on other platforms. * * At least some of them have values, on at least one platform, * that collide with other DLT_* codes on other platforms, e.g. * DLT_LOOP, so we don't just define them, on all platforms, * as having the same value as on the original platform. * * Therefore, we assigned new LINKTYPE_* codes to them, and, * on the platforms where they weren't originally defined, * define the DLT_* codes to have the same value as the * corresponding LINKTYPE_* codes. * * This means that, for capture files with the original * platform's DLT_* code rather than the LINKTYPE_* code * as a link-layer type, we will recognize those types * on that platform, but not on other platforms. * * We map the LINKTYPE_* codes to the corresponding * DLT_* code on platforms where the two codes differ.. */ #ifdef DLT_FR /* BSD/OS Frame Relay */ if (linktype == LINKTYPE_FRELAY) return (DLT_FR); #endif #if LINKTYPE_NETBSD_HDLC != DLT_HDLC /* NetBSD HDLC */ if (linktype == LINKTYPE_NETBSD_HDLC) return (DLT_HDLC); #endif #if LINKTYPE_C_HDLC != DLT_C_HDLC /* BSD/OS Cisco HDLC */ if (linktype == LINKTYPE_C_HDLC) return (DLT_C_HDLC); #endif #if LINKTYPE_LOOP != DLT_LOOP /* OpenBSD DLT_LOOP */ if (linktype == LINKTYPE_LOOP) return (DLT_LOOP); #endif #if LINKTYPE_ENC != DLT_ENC /* OpenBSD DLT_ENC */ if (linktype == LINKTYPE_ENC) return (DLT_ENC); #endif /* * These DLT_* codes are not on all platforms, but, so far, * there don't appear to be any platforms that define * other codes with those values; we map them to * different LINKTYPE_* values anyway, just in case. * * LINKTYPE_ATM_CLIP is a special case. DLT_ATM_CLIP is * not on all platforms, but, so far, there don't appear * to be any platforms that define it as anything other * than 19; we define LINKTYPE_ATM_CLIP as something * other than 19, just in case. That value is in the * high matching range, so we have to check for it. */ /* Linux ATM Classical IP */ if (linktype == LINKTYPE_ATM_CLIP) return (DLT_ATM_CLIP); /* * For all other values, return the linktype code as the * DLT_* code. * * If the code is in the high matching range, the * DLT_* code is the same as the LINKTYPE_* code. * * If the code is greater than the maximum value in * the high matching range, it may be a value from * a newer version of libpcap; we provide it in case * the program' capable of handling it. * * If the code is less than the minimum value in the * high matching range, it might be from a capture * written by code that doesn't map non-matching range * DLT_* codes to the appropriate LINKTYPE_* code, so * we'll just pass it through, so that *if it was written * on this platform* it will be interpreted correctly. * (We don't know whether it was written on this platform, * but at least this way there's *some* chance that it * can be read.) */ return linktype; } /* * Return the maximum snapshot length for a given DLT_ value. * * For most link-layer types, we use MAXIMUM_SNAPLEN. * * For DLT_DBUS, the maximum is 128MiB, as per * * https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages * * For DLT_EBHSCR, the maximum is 8MiB, as per * * https://www.elektrobit.com/ebhscr * * For DLT_USBPCAP, the maximum is 1MiB, as per * * https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=15985 */ u_int max_snaplen_for_dlt(int dlt) { switch (dlt) { case DLT_DBUS: return 128*1024*1024; case DLT_EBHSCR: return 8*1024*1024; case DLT_USBPCAP: return 1024*1024; default: return MAXIMUM_SNAPLEN; } }