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wireshark/wiretap/pcap-common.c

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/* pcap-common.c
* Code common to pcap and pcapng file formats
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
*
* File format support for pcapng file format
* Copyright (c) 2007 by Ulf Lamping <ulf.lamping@web.de>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "wtap-int.h"
#include "file_wrappers.h"
#include "atm.h"
#include "erf_record.h"
#include "pcap-encap.h"
#include "pcap-common.h"
/*
* On some systems, the FDDI MAC addresses are bit-swapped.
*
* XXX - what we *really* need to know is whether the addresses are
* bit-swapped *in a particular capture*, which depends on the system
* on which it was captured, not on the system that's reading it.
* Unfortunately, we can't determine that.
*/
#if !defined(ultrix) && !defined(__alpha) && !defined(__bsdi__)
#define BIT_SWAPPED_MAC_ADDRS
#endif
/*
* Map link-layer header types (LINKTYPE_ values) to Wiretap encapsulations.
*
* Either LBL NRG wasn't an adequate central registry (e.g., because of
* the slow rate of releases from them), or nobody bothered using them
* as a central registry, as many different groups have patched libpcap
* (and BPF, on the BSDs) to add new encapsulation types, and have ended
* up using the same DLT_ values for different encapsulation types.
*
* The Tcpdump Group now maintains the list of link-layer header types;
* they introduced a separate namespace of LINKTYPE_ values for the
* values to be used in capture files, and have libpcap map between
* those values in capture file headers and the DLT_ values that the
* pcap_datalink() and pcap_open_dead() APIs use. See
* https://www.tcpdump.org/linktypes.html for a list of LINKTYPE_ values.
*
* In most cases, the corresponding LINKTYPE_ and DLT_ values are the
* same. In the cases where the same link-layer header type was given
* different values in different OSes, a new LINKTYPE_ value was defined,
* different from all of the existing DLT_ values.
*
* This table maps LINKTYPE_ values to the corresponding Wiretap
* encapsulation. For cases where multiple DLT_ values were in use,
* it also checks what <pcap.h> defineds to determine how to interpret
* them, so that if a file was written by a version of libpcap prior
* to the introduction of the LINKTYPE_ values, and has a DLT_ value
* from the OS on which it was written rather than a LINKTYPE_ value
* as its linktype value in the file header, we map the numerical
* DLT_ value, as interpreted by the libpcap with which we're building
* Wireshark/Wiretap interprets them (which, if it doesn't support
* them at all, means we don't support them either - any capture files
* using them are foreign, and we don't hazard a guess as to which
* platform they came from; we could, I guess, choose the most likely
* platform), to the corresponding Wiretap encapsulation.
*
* Note: if you need a new encapsulation type for libpcap files, do
* *N*O*T* use *ANY* of the values listed here! I.e., do *NOT*
* add a new encapsulation type by changing an existing entry;
* leave the existing entries alone.
*
* Instead, send mail to tcpdump-workers@lists.tcpdump.org, asking for
* a new LINKTYPE_/DLT_ value, and specifying the purpose of the new
* value. When you get the new LINKTYPE_/DLT_ value, use that numerical
* value in the "linktype_value" field of "pcap_to_wtap_map[]".
*/
static const struct {
int linktype_value;
int wtap_encap_value;
} pcap_to_wtap_map[] = {
/*
* These are the values that are almost certainly the same
* in all libpcaps (I've yet to find one where the values
* in question are used for some purpose other than the
* one below, but...), and thus assigned as LINKTYPE_ values,
* and that Wiretap and Wireshark currently support.
*/
{ 0, WTAP_ENCAP_NULL }, /* null encapsulation */
{ 1, WTAP_ENCAP_ETHERNET },
{ 2, WTAP_ENCAP_3MB_ETHERNET },
{ 3, WTAP_ENCAP_AX25 },
{ 6, WTAP_ENCAP_TOKEN_RING }, /* IEEE 802 Networks - assume token ring */
{ 7, WTAP_ENCAP_ARCNET },
{ 8, WTAP_ENCAP_SLIP },
{ 9, WTAP_ENCAP_PPP },
#ifdef BIT_SWAPPED_MAC_ADDRS
{ 10, WTAP_ENCAP_FDDI_BITSWAPPED },
#else
{ 10, WTAP_ENCAP_FDDI },
#endif
{ 32, WTAP_ENCAP_REDBACK },
/*
* 50 is DLT_PPP_SERIAL in NetBSD; it appears that DLT_PPP
* on BSD (at least according to standard tcpdump) has, as
* the first octet, an indication of whether the packet was
* transmitted or received (rather than having the standard
* PPP address value of 0xff), but that DLT_PPP_SERIAL puts
* a real live PPP header there, or perhaps a Cisco PPP header
* as per section 4.3.1 of RFC 1547 (implementations of this
* exist in various BSDs in "sys/net/if_spppsubr.c", and
* I think also exist either in standard Linux or in
* various Linux patches; the implementations show how to handle
* Cisco keepalive packets).
*
* However, I don't see any obvious place in FreeBSD "if_ppp.c"
* where anything other than the standard PPP header would be
* passed up. I see some stuff that sets the first octet
* to 0 for incoming and 1 for outgoing packets before applying
* a BPF filter to see whether to drop packets whose protocol
* field has the 0x8000 bit set, i.e. network control protocols -
* those are handed up to userland - but that code puts the
* address field back before passing the packet up.
*
* I also don't see anything immediately obvious that munges
* the address field for sync PPP, either.
*
* Wireshark currently assumes that if the first octet of a
* PPP frame is 0xFF, it's the address field and is followed
* by a control field and a 2-byte protocol, otherwise the
* address and control fields are absent and the frame begins
* with a protocol field. If we ever see a BSD/OS PPP
* capture, we'll have to handle it differently, and we may
* have to handle standard BSD captures differently if, in fact,
* they don't have 0xff 0x03 as the first two bytes - but, as per
* the two paragraphs preceding this, it's not clear that
* the address field *is* munged into an incoming/outgoing
* field when the packet is handed to the BPF device.
*
* For now, we just map DLT_PPP_SERIAL to WTAP_ENCAP_PPP, as
* we treat WTAP_ENCAP_PPP packets as if those beginning with
* 0xff have the standard RFC 1662 "PPP in HDLC-like Framing"
* 0xff 0x03 address/control header, and DLT_PPP_SERIAL frames
* appear to contain that unless they're Cisco frames (if we
* ever see a capture with them, we'd need to implement the
* RFC 1547 stuff, and the keepalive protocol stuff).
*
* We may have to distinguish between "PPP where if it doesn't
* begin with 0xff there's no HDLC encapsulation and the frame
* begins with the protocol field" (which is how we handle
* WTAP_ENCAP_PPP now) and "PPP where there's either HDLC
* encapsulation or Cisco PPP" (which is what DLT_PPP_SERIAL
* is) at some point.
*
* XXX - NetBSD has DLT_HDLC, which appears to be used for
* Cisco HDLC. Ideally, they should use DLT_PPP_SERIAL
* only for real live HDLC-encapsulated PPP, not for Cisco
* HDLC.
*/
{ 50, WTAP_ENCAP_PPP },
/*
* Used by NetBSD and OpenBSD pppoe(4).
*/
{ 51, WTAP_ENCAP_PPP_ETHER },
/*
* Apparently used by the Axent Raptor firewall (now Symantec
* Enterprise Firewall).
* Thanks, Axent, for not reserving that type with tcpdump.org
* and not telling anybody about it.
*/
{ 99, WTAP_ENCAP_SYMANTEC },
/*
* These are the values that libpcap 0.5 and later use in
* capture file headers, in an attempt to work around the
* confusion decried above, and that Wiretap and Wireshark
* currently support. I.e., they're the LINKTYPE_ values
* for RFC 1483 ATM and "raw IP", respectively, not the
* DLT_ values for them on all platforms.
*/
{ 100, WTAP_ENCAP_ATM_RFC1483 },
{ 101, WTAP_ENCAP_RAW_IP },
#if 0
/*
* More values used by libpcap 0.5 as DLT_ values and used by the
* current CVS version of libpcap in capture file headers.
* They are not yet handled in Wireshark.
* If we get a capture that contains them, we'll implement them.
*/
{ 102, WTAP_ENCAP_SLIP_BSDOS },
{ 103, WTAP_ENCAP_PPP_BSDOS },
#endif
/*
* These ones are handled in Wireshark, though.
*/
{ 104, WTAP_ENCAP_CHDLC }, /* Cisco HDLC */
{ 105, WTAP_ENCAP_IEEE_802_11 }, /* IEEE 802.11 */
{ 106, WTAP_ENCAP_LINUX_ATM_CLIP },
{ 107, WTAP_ENCAP_FRELAY }, /* Frame Relay */
{ 108, WTAP_ENCAP_LOOP }, /* OpenBSD loopback */
{ 109, WTAP_ENCAP_ENC }, /* OpenBSD IPSEC enc */
#if 0
{ 110, WTAP_ENCAP_LANE_802_3 },/* ATM LANE 802.3 */
{ 111, WTAP_ENCAP_HIPPI }, /* NetBSD HIPPI */
#endif
{ 112, WTAP_ENCAP_CHDLC }, /* NetBSD HDLC framing */
/*
* Linux "cooked mode" captures, used by the current CVS version
* of libpcap
* OR
* it could be a packet in Cisco's ERSPAN encapsulation which uses
* this number as well (why can't people stick to protocols when it
* comes to allocating/using DLT types).
*/
{ 113, WTAP_ENCAP_SLL }, /* Linux cooked capture v1 */
{ 114, WTAP_ENCAP_LOCALTALK }, /* Localtalk */
/*
* The tcpdump.org version of libpcap uses 117, rather than 17,
* for OpenBSD packet filter logging, so as to avoid conflicting
* with DLT_LANE8023 in SuSE 6.3 libpcap.
*/
{ 117, WTAP_ENCAP_PFLOG },
{ 118, WTAP_ENCAP_CISCO_IOS },
{ 119, WTAP_ENCAP_IEEE_802_11_PRISM }, /* 802.11 plus Prism monitor mode radio header */
{ 121, WTAP_ENCAP_HHDLC }, /* HiPath HDLC */
{ 122, WTAP_ENCAP_IP_OVER_FC }, /* RFC 2625 IP-over-FC */
{ 123, WTAP_ENCAP_ATM_PDUS }, /* SunATM */
{ 127, WTAP_ENCAP_IEEE_802_11_RADIOTAP }, /* 802.11 plus radiotap radio header */
{ 128, WTAP_ENCAP_TZSP }, /* Tazmen Sniffer Protocol */
{ 129, WTAP_ENCAP_ARCNET_LINUX },
{ 130, WTAP_ENCAP_JUNIPER_MLPPP }, /* Juniper MLPPP on ML-, LS-, AS- PICs */
{ 131, WTAP_ENCAP_JUNIPER_MLFR }, /* Juniper MLFR (FRF.15) on ML-, LS-, AS- PICs */
{ 133, WTAP_ENCAP_JUNIPER_GGSN},
/*
* Values 132 and 134 not listed here are reserved for use
* in Juniper hardware.
*/
{ 135, WTAP_ENCAP_JUNIPER_ATM2 }, /* various encapsulations captured on the ATM2 PIC */
{ 136, WTAP_ENCAP_JUNIPER_SVCS }, /* various encapsulations captured on the services PIC */
{ 137, WTAP_ENCAP_JUNIPER_ATM1 }, /* various encapsulations captured on the ATM1 PIC */
{ 138, WTAP_ENCAP_APPLE_IP_OVER_IEEE1394 },
/* Apple IP-over-IEEE 1394 */
{ 139, WTAP_ENCAP_MTP2_WITH_PHDR },
{ 140, WTAP_ENCAP_MTP2 },
{ 141, WTAP_ENCAP_MTP3 },
{ 142, WTAP_ENCAP_SCCP },
{ 143, WTAP_ENCAP_DOCSIS },
{ 144, WTAP_ENCAP_IRDA }, /* IrDA capture */
/* Reserved for private use. */
{ 147, WTAP_ENCAP_USER0 },
{ 148, WTAP_ENCAP_USER1 },
{ 149, WTAP_ENCAP_USER2 },
{ 150, WTAP_ENCAP_USER3 },
{ 151, WTAP_ENCAP_USER4 },
{ 152, WTAP_ENCAP_USER5 },
{ 153, WTAP_ENCAP_USER6 },
{ 154, WTAP_ENCAP_USER7 },
{ 155, WTAP_ENCAP_USER8 },
{ 156, WTAP_ENCAP_USER9 },
{ 157, WTAP_ENCAP_USER10 },
{ 158, WTAP_ENCAP_USER11 },
{ 159, WTAP_ENCAP_USER12 },
{ 160, WTAP_ENCAP_USER13 },
{ 161, WTAP_ENCAP_USER14 },
{ 162, WTAP_ENCAP_USER15 },
{ 163, WTAP_ENCAP_IEEE_802_11_AVS }, /* 802.11 plus AVS radio header */
/*
* 164 is reserved for Juniper-private chassis-internal
* meta-information such as QoS profiles, etc..
*/
{ 165, WTAP_ENCAP_BACNET_MS_TP },
/*
* 166 is reserved for a PPP variant in which the first byte
* of the 0xff03 header, the 0xff, is replaced by a direction
* byte. I don't know whether any captures look like that,
* but it is used for some Linux IP filtering (ipfilter?).
*/
/* Ethernet PPPoE frames captured on a service PIC */
{ 167, WTAP_ENCAP_JUNIPER_PPPOE },
/*
* 168 is reserved for more Juniper private-chassis-
* internal meta-information.
*/
{ 169, WTAP_ENCAP_GPRS_LLC },
/* ITU-T G.7041/Y.1303 Generic Framing Procedure. */
{ 170, WTAP_ENCAP_GFP_T },
{ 171, WTAP_ENCAP_GFP_F },
/* Registered by Gcom, Inc. */
{ 172, WTAP_ENCAP_GCOM_TIE1 },
{ 173, WTAP_ENCAP_GCOM_SERIAL },
{ 177, WTAP_ENCAP_LINUX_LAPD },
/* Ethernet frames prepended with meta-information */
{ 178, WTAP_ENCAP_JUNIPER_ETHER },
/* PPP frames prepended with meta-information */
{ 179, WTAP_ENCAP_JUNIPER_PPP },
/* Frame-Relay frames prepended with meta-information */
{ 180, WTAP_ENCAP_JUNIPER_FRELAY },
/* C-HDLC frames prepended with meta-information */
{ 181, WTAP_ENCAP_JUNIPER_CHDLC },
/* VOIP Frames prepended with meta-information */
{ 183, WTAP_ENCAP_JUNIPER_VP },
/* Virtual Network Frames prepended with meta-information */
{ 184, WTAP_ENCAP_JUNIPER_VN },
/* USB packets from FreeBSD's USB BPF tap */
{ 186, WTAP_ENCAP_USB_FREEBSD },
/* Bluetooth HCI UART transport (part H:4) frames, like hcidump */
{ 187, WTAP_ENCAP_BLUETOOTH_H4 },
/* IEEE 802.16 MAC Common Part Sublayer */
{ 188, WTAP_ENCAP_IEEE802_16_MAC_CPS },
/* USB packets with Linux-specified header */
{ 189, WTAP_ENCAP_USB_LINUX },
/* CAN 2.0b frame */
{ 190, WTAP_ENCAP_CAN20B },
/* Per-Packet Information header */
{ 192, WTAP_ENCAP_PPI },
/* IEEE 802.15.4 Wireless PAN */
{ 195, WTAP_ENCAP_IEEE802_15_4 },
/* SITA File Encapsulation */
{ 196, WTAP_ENCAP_SITA },
/* Endace Record File Encapsulation */
{ 197, WTAP_ENCAP_ERF },
/* IPMB/I2C with Kontron pseudo-header */
{ 199, WTAP_ENCAP_IPMB_KONTRON },
/* Juniper-private data link type, used for capturing data on a secure tunnel interface. */
{ 200, WTAP_ENCAP_JUNIPER_ST },
/* Bluetooth HCI UART transport (part H:4) frames, like hcidump */
{ 201, WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR },
/* AX.25 packet with a 1-byte KISS header */
{ 202, WTAP_ENCAP_AX25_KISS },
/* LAPD frame */
{ 203, WTAP_ENCAP_LAPD },
/* PPP with pseudoheader */
{ 204, WTAP_ENCAP_PPP_WITH_PHDR },
/* IPMB/I2C with a Linux-specific header (defined by Pigeon Point Systems) */
{ 209, WTAP_ENCAP_I2C_LINUX },
/* FlexRay frame */
{ 210, WTAP_ENCAP_FLEXRAY },
/* MOST frame */
{ 211, WTAP_ENCAP_MOST },
/* LIN frame */
{ 212, WTAP_ENCAP_LIN },
/* X2E Xoraya serial frame */
{ 213, WTAP_ENCAP_X2E_SERIAL },
/* X2E Xoraya frame */
{ 214, WTAP_ENCAP_X2E_XORAYA },
/* IEEE 802.15.4 Wireless PAN non-ASK PHY */
{ 215, WTAP_ENCAP_IEEE802_15_4_NONASK_PHY },
/* USB packets with padded Linux-specified header */
{ 220, WTAP_ENCAP_USB_LINUX_MMAPPED },
/* Fibre Channel FC-2 frame */
{ 224, WTAP_ENCAP_FIBRE_CHANNEL_FC2 },
/* Fibre Channel FC-2 frame with Delimiter */
{ 225, WTAP_ENCAP_FIBRE_CHANNEL_FC2_WITH_FRAME_DELIMS },
/* Solaris IPNET */
{ 226, WTAP_ENCAP_IPNET },
/* SocketCAN frame */
{ 227, WTAP_ENCAP_SOCKETCAN },
/* Raw IPv4 */
{ 228, WTAP_ENCAP_RAW_IP4 },
/* Raw IPv6 */
{ 229, WTAP_ENCAP_RAW_IP6 },
/* IEEE 802.15.4 Wireless PAN no fcs */
{ 230, WTAP_ENCAP_IEEE802_15_4_NOFCS },
/* D-BUS */
{ 231, WTAP_ENCAP_DBUS },
/* DVB-CI (Common Interface) */
{ 235, WTAP_ENCAP_DVBCI },
/* MUX27010 */
{ 236, WTAP_ENCAP_MUX27010 },
/* STANAG 5066 - DTS(Data Transfer Sublayer) PDU */
{ 237, WTAP_ENCAP_STANAG_5066_D_PDU },
/* NFLOG */
{ 239, WTAP_ENCAP_NFLOG },
/* netANALYZER pseudo-header followed by Ethernet with CRC */
{ 240, WTAP_ENCAP_NETANALYZER },
/* netANALYZER pseudo-header in transparent mode */
{ 241, WTAP_ENCAP_NETANALYZER_TRANSPARENT },
/* IP-over-Infiniband, as specified by RFC 4391 section 6 */
{ 242, WTAP_ENCAP_IP_OVER_IB_PCAP },
/* ISO/IEC 13818-1 MPEG2-TS packets */
{ 243, WTAP_ENCAP_MPEG_2_TS },
/* NFC LLCP */
{ 245, WTAP_ENCAP_NFC_LLCP },
/* SCTP */
{ 248, WTAP_ENCAP_SCTP},
/* USBPcap */
{ 249, WTAP_ENCAP_USBPCAP},
/* RTAC SERIAL */
{ 250, WTAP_ENCAP_RTAC_SERIAL},
/* Bluetooth Low Energy Link Layer */
{ 251, WTAP_ENCAP_BLUETOOTH_LE_LL},
/* Wireshark Upper PDU export */
{ 252, WTAP_ENCAP_WIRESHARK_UPPER_PDU},
/* Netlink Protocol (nlmon devices) */
{ 253, WTAP_ENCAP_NETLINK },
/* Bluetooth Linux Monitor */
{ 254, WTAP_ENCAP_BLUETOOTH_LINUX_MONITOR },
/* Bluetooth BR/EDR Baseband RF captures */
{ 255, WTAP_ENCAP_BLUETOOTH_BREDR_BB },
/* Bluetooth Low Energy Link Layer RF captures */
{ 256, WTAP_ENCAP_BLUETOOTH_LE_LL_WITH_PHDR },
/* Apple PKTAP */
{ 258, WTAP_ENCAP_PKTAP },
/* Ethernet Passive Optical Network */
{ 259, WTAP_ENCAP_EPON },
/* IPMI Trace Data Collection */
{ 260, WTAP_ENCAP_IPMI_TRACE },
/* ISO 14443 contactless smartcard standards */
{ 264, WTAP_ENCAP_ISO14443 },
/* USB packets from Darwin (macOS, iOS) BPF tap */
{ 266, WTAP_ENCAP_USB_DARWIN },
/* IBM SDLC frames containing SNA PDUs */
{ 268, WTAP_ENCAP_SDLC },
/* LoRaTap */
{ 270, WTAP_ENCAP_LORATAP },
/* Linux vsock */
{ 271, WTAP_ENCAP_VSOCK },
/* Nordic BLE Sniffer */
{ 272, WTAP_ENCAP_NORDIC_BLE },
/* DOCSIS31 XRA31 Sniffer */
{ 273, WTAP_ENCAP_DOCSIS31_XRA31 },
/* mPackets as specified by 802.3br */
{ 274, WTAP_ENCAP_ETHERNET_MPACKET },
/* DisplayPort AUX channel monitor */
{ 275, WTAP_ENCAP_DPAUXMON },
/* Linux cooked capture v2 */
{ 276, WTAP_ENCAP_SLL2 },
/* Elektrobit High Speed Capture and Replay */
{ 279, WTAP_ENCAP_EBHSCR },
/* VPP dispatch trace */
{ 280, WTAP_ENCAP_VPP },
/* IEEE 802.15.4 TAP */
{ 283, WTAP_ENCAP_IEEE802_15_4_TAP },
/* Z-Wave Serial API */
{ 287, WTAP_ENCAP_ZWAVE_SERIAL },
/* USB 2.0/1.1/1.0 packets as transmitted over the cable */
{ 288, WTAP_ENCAP_USB_2_0 },
/* windows ETL*/
{ 290, WTAP_ENCAP_ETL},
/*
* To repeat:
*
* If you need a new encapsulation type for pcap and pcapng files,
* do *N*O*T* use *ANY* of the values listed here! I.e., do *NOT*
* add a new encapsulation type by changing an existing entry;
* leave the existing entries alone.
*
* Instead, send mail to tcpdump-workers@lists.tcpdump.org, asking
* for a new DLT_ value, and specifying the purpose of the new value.
* When you get the new DLT_ value, use that numerical value in
* the "linktype_value" field of "pcap_to_wtap_map[]".
*/
/*
* The following are entries for libpcap type values that have
* different meanings on different OSes. I.e., these are DLT_
* values that are different on different OSes, and that have
* a separate LINKTYPE_ value assigned to them.
*
* We put these *after* the entries for the LINKTYPE_ values for
* those Wiretap encapsulation types, so that, when writing a
* pcap or pcapng file, Wireshark writes the LINKTYPE_ value,
* not the OS's DLT_ value, as the file's link-layer header type
* for pcap or the interface's link-layer header type.
*/
/*
* 11 is DLT_ATM_RFC1483 on most platforms; the only version of
* libpcap I've seen that define anything other than DLT_ATM_RFC1483
* as 11 is the BSD/OS one, which defines DLT_FR as 11. We handle
* it as Frame Relay on BSD/OS and LLC-encapsulated ATM on all other
* platforms.
*/
#if defined(__bsdi__) /* BSD/OS */
{ 11, WTAP_ENCAP_FRELAY },
#else
{ 11, WTAP_ENCAP_ATM_RFC1483 },
#endif
/*
* 12 is DLT_RAW on most platforms, but it's DLT_C_HDLC on
* BSD/OS, and DLT_LOOP on OpenBSD.
*
* We don't yet handle DLT_C_HDLC, but we can handle DLT_LOOP
* (it's just like DLT_NULL, only with the AF_ value in network
* rather than host byte order - Wireshark figures out the
* byte order from the data, so we don't care what byte order
* it's in), so, on OpenBSD, interpret 12 as WTAP_ENCAP_LOOP,
* otherwise, if we're not on BSD/OS, interpret it as
* WTAP_ENCAP_RAW_IP.
*/
#if defined(__OpenBSD__)
{ 12, WTAP_ENCAP_LOOP },
#elif defined(__bsdi__) /* BSD/OS */
/*
* Put entry for Cisco HDLC here.
* XXX - is this just WTAP_ENCAP_CHDLC, i.e. does the frame
* start with a 4-byte Cisco HDLC header?
*/
#else
{ 12, WTAP_ENCAP_RAW_IP },
#endif
/*
* 13 is DLT_SLIP_BSDOS on FreeBSD and NetBSD, but those OSes
* don't actually generate it. I infer that BSD/OS translates
* DLT_SLIP from the kernel BPF code to DLT_SLIP_BSDOS in
* libpcap, as the BSD/OS link-layer header is different;
* however, in BSD/OS, DLT_SLIP_BSDOS is 15.
*
* From this, I infer that there's no point in handling 13
* as DLT_SLIP_BSDOS.
*
* 13 is DLT_ATM_RFC1483 on BSD/OS.
*
* 13 is DLT_ENC in OpenBSD, which is, I suspect, some kind
* of decrypted IPsec traffic.
*
* We treat 13 as WTAP_ENCAP_ENC on all systems except those
* that define DLT_ATM_RFC1483 as 13 - presumably only
* BSD/OS does so - so that, on BSD/OS systems, we still
* treat 13 as WTAP_ENCAP_ATM_RFC1483, but, on all other
* systems, we can read OpenBSD DLT_ENC captures.
*/
#if defined(__bsdi__) /* BSD/OS */
{ 13, WTAP_ENCAP_ATM_RFC1483 },
#else
{ 13, WTAP_ENCAP_ENC },
#endif
/*
* 14 is DLT_PPP_BSDOS on FreeBSD and NetBSD, but those OSes
* don't actually generate it. I infer that BSD/OS translates
* DLT_PPP from the kernel BPF code to DLT_PPP_BSDOS in
* libpcap, as the BSD/OS link-layer header is different;
* however, in BSD/OS, DLT_PPP_BSDOS is 16.
*
* From this, I infer that there's no point in handling 14
* as DLT_PPP_BSDOS.
*
* 14 is DLT_RAW on BSD/OS and OpenBSD.
*/
{ 14, WTAP_ENCAP_RAW_IP },
/*
* 15 is:
*
* DLT_SLIP_BSDOS on BSD/OS;
*
* DLT_HIPPI on NetBSD;
*
* DLT_LANE8023 with Alexey Kuznetzov's patches for
* Linux libpcap;
*
* DLT_I4L_RAWIP with the ISDN4Linux patches for libpcap
* (and on SuSE 6.3);
*
* but we don't currently handle any of those.
*/
/*
* 16 is:
*
* DLT_PPP_BSDOS on BSD/OS;
*
* DLT_HDLC on NetBSD (Cisco HDLC);
*
* DLT_CIP with Alexey Kuznetzov's patches for
* Linux libpcap - this is WTAP_ENCAP_LINUX_ATM_CLIP;
*
* DLT_I4L_IP with the ISDN4Linux patches for libpcap
* (and on SuSE 6.3).
*/
#if defined(__NetBSD__)
{ 16, WTAP_ENCAP_CHDLC },
#elif !defined(__bsdi__)
/*
* If you care about the two different Linux interpretations
* of 16, fix it yourself.
*/
{ 16, WTAP_ENCAP_LINUX_ATM_CLIP },
#endif
/*
* 17 is DLT_LANE8023 in SuSE 6.3 libpcap; we don't currently
* handle it.
* It is also used as the PF (Packet Filter) logging format beginning
* with OpenBSD 3.0; we use 17 for PF logs on OpenBSD and don't
* use it otherwise.
*/
#if defined(__OpenBSD__)
{ 17, WTAP_ENCAP_OLD_PFLOG },
#endif
/*
* 18 is DLT_CIP in SuSE 6.3 libpcap; if it's the same as the
* DLT_CIP of 16 that the Alexey Kuznetzov patches for
* libpcap/tcpdump define, it's WTAP_ENCAP_LINUX_ATM_CLIP.
* I've not found any version of libpcap that uses it for any
* other purpose - hopefully nobody will do so in the future.
*/
{ 18, WTAP_ENCAP_LINUX_ATM_CLIP },
/*
* 19 is DLT_ATM_CLIP in the libpcap/tcpdump patches in the
* recent versions I've seen of the Linux ATM distribution;
* I've not yet found any version of libpcap file that uses it
* for any other purpose - hopefully nobody will do so in
* the future.
*/
{ 19, WTAP_ENCAP_LINUX_ATM_CLIP },
/*
* To repeat:
*
* If you need a new encapsulation type for pcap and pcapng files,
* do *N*O*T* use *ANY* of the values listed here! I.e., do *NOT*
* add a new encapsulation type by changing an existing entry;
* leave the existing entries alone.
*
* Instead, send mail to tcpdump-workers@lists.tcpdump.org, asking
* for a new DLT_ value, and specifying the purpose of the new value.
* When you get the new DLT_ value, use that numerical value in
* the "linktype_value" field of "pcap_to_wtap_map[]".
*/
};
#define NUM_PCAP_ENCAPS (sizeof pcap_to_wtap_map / sizeof pcap_to_wtap_map[0])
int
wtap_pcap_encap_to_wtap_encap(int encap)
{
unsigned int i;
for (i = 0; i < NUM_PCAP_ENCAPS; i++) {
if (pcap_to_wtap_map[i].linktype_value == encap)
return pcap_to_wtap_map[i].wtap_encap_value;
}
return WTAP_ENCAP_UNKNOWN;
}
int
wtap_wtap_encap_to_pcap_encap(int encap)
{
unsigned int i;
switch (encap) {
case WTAP_ENCAP_FDDI:
case WTAP_ENCAP_FDDI_BITSWAPPED:
/*
* Special-case WTAP_ENCAP_FDDI and
* WTAP_ENCAP_FDDI_BITSWAPPED; both of them get mapped
* to DLT_FDDI (even though that may mean that the bit
* order in the FDDI MAC addresses is wrong; so it goes
* - libpcap format doesn't record the byte order,
* so that's not fixable).
*
* The pcap_to_wtap_map[] table will only have an
* entry for one of the above, which is why we have
* to special-case them.
*/
return 10; /* that's DLT_FDDI */
case WTAP_ENCAP_NETTL_FDDI:
/*
* This will discard the nettl information, as that's
* in the pseudo-header.
*
* XXX - what about Ethernet and Token Ring?
*/
return 10; /* that's DLT_FDDI */
case WTAP_ENCAP_FRELAY_WITH_PHDR:
/*
* This will discard the pseudo-header information.
*/
return 107;
case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
/*
* Map this to DLT_IEEE802_11, for now, even though
* that means the radio information will be lost.
* We should try to map those values to radiotap
* values and write this out as a radiotap file,
* if possible.
*/
return 105;
}
for (i = 0; i < NUM_PCAP_ENCAPS; i++) {
if (pcap_to_wtap_map[i].wtap_encap_value == encap)
return pcap_to_wtap_map[i].linktype_value;
}
return -1;
}
/*
* For most encapsulations, we use WTAP_MAX_PACKET_SIZE_STANDARD, as
* that should be enough for most link-layer types, and shouldn't be
* too big.
*
* For some link-layer types, we use larger types, because, for each
* of them, the maximum packet size is larger than the standard
* maximum, and is bigger than we'd want for all link-layer types - files
* with that snapshot length might cause some programs reading them to
* allocate a huge and wasteful buffer and, at least on 32-bit platforms,
* run the risk of running out of memory.
*/
guint
wtap_max_snaplen_for_encap(int wtap_encap)
{
switch (wtap_encap) {
case WTAP_ENCAP_DBUS:
return WTAP_MAX_PACKET_SIZE_DBUS;
case WTAP_ENCAP_EBHSCR:
return WTAP_MAX_PACKET_SIZE_EBHSCR;
case WTAP_ENCAP_USBPCAP:
return WTAP_MAX_PACKET_SIZE_USBPCAP;
default:
return WTAP_MAX_PACKET_SIZE_STANDARD;
}
}
/*
* Various pseudo-headers that appear at the beginning of packet data.
*
* We represent them as sets of offsets, as they might not be aligned on
* an appropriate structure boundary in the buffer, and as that makes them
* independent of the way the compiler might align fields.
*/
/*
* The link-layer header on Nokia IPSO ATM packets.
*/
#define NOKIAATM_FLAGS 0 /* destination - 1 byte */
#define NOKIAATM_VPI 1 /* VPI - 1 byte */
#define NOKIAATM_VCI 2 /* VCI - 2 bytes */
#define NOKIAATM_LEN 4 /* length of the header */
static int
pcap_read_nokiaatm_pseudoheader(FILE_T fh,
union wtap_pseudo_header *pseudo_header, guint packet_size,
int *err, gchar **err_info)
{
guint8 atm_phdr[NOKIAATM_LEN];
guint8 vpi;
guint16 vci;
if (packet_size < NOKIAATM_LEN) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: Nokia IPSO ATM file has a %u-byte packet, too small to have even an ATM pseudo-header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, atm_phdr, NOKIAATM_LEN, err, err_info))
return -1;
vpi = atm_phdr[NOKIAATM_VPI];
vci = pntoh16(&atm_phdr[NOKIAATM_VCI]);
pseudo_header->atm.vpi = vpi;
pseudo_header->atm.vci = vci;
pseudo_header->atm.channel = (atm_phdr[NOKIAATM_FLAGS] & 0x80) ? 0 : 1;
/* We don't have this information */
pseudo_header->atm.flags = 0;
pseudo_header->atm.cells = 0;
pseudo_header->atm.aal5t_u2u = 0;
pseudo_header->atm.aal5t_len = 0;
pseudo_header->atm.aal5t_chksum = 0;
return NOKIAATM_LEN;
}
/*
* The link-layer header on SunATM packets.
*/
#define SUNATM_FLAGS 0 /* destination and traffic type - 1 byte */
#define SUNATM_VPI 1 /* VPI - 1 byte */
#define SUNATM_VCI 2 /* VCI - 2 bytes */
#define SUNATM_LEN 4 /* length of the header */
static int
pcap_read_sunatm_pseudoheader(FILE_T fh,
union wtap_pseudo_header *pseudo_header, guint packet_size,
int *err, gchar **err_info)
{
guint8 atm_phdr[SUNATM_LEN];
guint8 vpi;
guint16 vci;
if (packet_size < SUNATM_LEN) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: SunATM file has a %u-byte packet, too small to have even an ATM pseudo-header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, atm_phdr, SUNATM_LEN, err, err_info))
return -1;
vpi = atm_phdr[SUNATM_VPI];
vci = pntoh16(&atm_phdr[SUNATM_VCI]);
switch (atm_phdr[SUNATM_FLAGS] & 0x0F) {
case 0x01: /* LANE */
pseudo_header->atm.aal = AAL_5;
pseudo_header->atm.type = TRAF_LANE;
break;
case 0x02: /* RFC 1483 LLC multiplexed traffic */
pseudo_header->atm.aal = AAL_5;
pseudo_header->atm.type = TRAF_LLCMX;
break;
case 0x05: /* ILMI */
pseudo_header->atm.aal = AAL_5;
pseudo_header->atm.type = TRAF_ILMI;
break;
case 0x06: /* Q.2931 */
pseudo_header->atm.aal = AAL_SIGNALLING;
pseudo_header->atm.type = TRAF_UNKNOWN;
break;
case 0x03: /* MARS (RFC 2022) */
pseudo_header->atm.aal = AAL_5;
pseudo_header->atm.type = TRAF_UNKNOWN;
break;
case 0x04: /* IFMP (Ipsilon Flow Management Protocol; see RFC 1954) */
pseudo_header->atm.aal = AAL_5;
pseudo_header->atm.type = TRAF_UNKNOWN; /* XXX - TRAF_IPSILON? */
break;
default:
/*
* Assume it's AAL5, unless it's VPI 0 and VCI 5, in which
* case assume it's AAL_SIGNALLING; we know nothing more
* about it.
*
* XXX - is this necessary? Or are we guaranteed that
* all signalling traffic has a type of 0x06?
*
* XXX - is this guaranteed to be AAL5? Or, if the type is
* 0x00 ("raw"), might it be non-AAL5 traffic?
*/
if (vpi == 0 && vci == 5)
pseudo_header->atm.aal = AAL_SIGNALLING;
else
pseudo_header->atm.aal = AAL_5;
pseudo_header->atm.type = TRAF_UNKNOWN;
break;
}
pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
pseudo_header->atm.vpi = vpi;
pseudo_header->atm.vci = vci;
pseudo_header->atm.channel = (atm_phdr[SUNATM_FLAGS] & 0x80) ? 0 : 1;
/* We don't have this information */
pseudo_header->atm.flags = 0;
pseudo_header->atm.cells = 0;
pseudo_header->atm.aal5t_u2u = 0;
pseudo_header->atm.aal5t_len = 0;
pseudo_header->atm.aal5t_chksum = 0;
return SUNATM_LEN;
}
static gboolean
pcap_write_sunatm_pseudoheader(wtap_dumper *wdh,
const union wtap_pseudo_header *pseudo_header, int *err)
{
guint8 atm_hdr[SUNATM_LEN];
/*
* Write the ATM header.
*/
atm_hdr[SUNATM_FLAGS] =
(pseudo_header->atm.channel == 0) ? 0x80 : 0x00;
switch (pseudo_header->atm.aal) {
case AAL_SIGNALLING:
/* Q.2931 */
atm_hdr[SUNATM_FLAGS] |= 0x06;
break;
case AAL_5:
switch (pseudo_header->atm.type) {
case TRAF_LANE:
/* LANE */
atm_hdr[SUNATM_FLAGS] |= 0x01;
break;
case TRAF_LLCMX:
/* RFC 1483 LLC multiplexed traffic */
atm_hdr[SUNATM_FLAGS] |= 0x02;
break;
case TRAF_ILMI:
/* ILMI */
atm_hdr[SUNATM_FLAGS] |= 0x05;
break;
}
break;
}
atm_hdr[SUNATM_VPI] = (guint8)pseudo_header->atm.vpi;
phtons(&atm_hdr[SUNATM_VCI], pseudo_header->atm.vci);
if (!wtap_dump_file_write(wdh, atm_hdr, sizeof(atm_hdr), err))
return FALSE;
wdh->bytes_dumped += sizeof(atm_hdr);
return TRUE;
}
/*
* The fake link-layer header of IrDA packets as introduced by Jean Tourrilhes
* to libpcap.
*/
#define IRDA_SLL_PKTTYPE_OFFSET 0 /* packet type - 2 bytes */
/* 12 unused bytes */
#define IRDA_SLL_PROTOCOL_OFFSET 14 /* protocol, should be ETH_P_LAPD - 2 bytes */
#define IRDA_SLL_LEN 16 /* length of the header */
static int
pcap_read_irda_pseudoheader(FILE_T fh, union wtap_pseudo_header *pseudo_header,
guint packet_size, int *err, gchar **err_info)
{
guint8 irda_phdr[IRDA_SLL_LEN];
if (packet_size < IRDA_SLL_LEN) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: IrDA file has a %u-byte packet, too small to have even an IrDA pseudo-header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, irda_phdr, IRDA_SLL_LEN, err, err_info))
return -1;
if (pntoh16(&irda_phdr[IRDA_SLL_PROTOCOL_OFFSET]) != 0x0017) {
*err = WTAP_ERR_BAD_FILE;
if (err_info != NULL)
*err_info = g_strdup("pcap/pcapng: IrDA capture has a packet with an invalid sll_protocol field");
return -1;
}
pseudo_header->irda.pkttype = pntoh16(&irda_phdr[IRDA_SLL_PKTTYPE_OFFSET]);
return IRDA_SLL_LEN;
}
static gboolean
pcap_write_irda_pseudoheader(wtap_dumper *wdh,
const union wtap_pseudo_header *pseudo_header, int *err)
{
guint8 irda_hdr[IRDA_SLL_LEN];
/*
* Write the IrDA header.
*/
memset(irda_hdr, 0, sizeof(irda_hdr));
phtons(&irda_hdr[IRDA_SLL_PKTTYPE_OFFSET], pseudo_header->irda.pkttype);
phtons(&irda_hdr[IRDA_SLL_PROTOCOL_OFFSET], 0x0017);
if (!wtap_dump_file_write(wdh, irda_hdr, sizeof(irda_hdr), err))
return FALSE;
wdh->bytes_dumped += sizeof(irda_hdr);
return TRUE;
}
/*
* A header containing additional MTP information.
*/
#define MTP2_SENT_OFFSET 0 /* 1 byte */
#define MTP2_ANNEX_A_USED_OFFSET 1 /* 1 byte */
#define MTP2_LINK_NUMBER_OFFSET 2 /* 2 bytes */
#define MTP2_HDR_LEN 4 /* length of the header */
static int
pcap_read_mtp2_pseudoheader(FILE_T fh, union wtap_pseudo_header *pseudo_header,
guint packet_size, int *err, gchar **err_info)
{
guint8 mtp2_hdr[MTP2_HDR_LEN];
if (packet_size < MTP2_HDR_LEN) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: MTP2 file has a %u-byte packet, too small to have even an MTP2 pseudo-header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, mtp2_hdr, MTP2_HDR_LEN, err, err_info))
return -1;
pseudo_header->mtp2.sent = mtp2_hdr[MTP2_SENT_OFFSET];
pseudo_header->mtp2.annex_a_used = mtp2_hdr[MTP2_ANNEX_A_USED_OFFSET];
pseudo_header->mtp2.link_number = pntoh16(&mtp2_hdr[MTP2_LINK_NUMBER_OFFSET]);
return MTP2_HDR_LEN;
}
static gboolean
pcap_write_mtp2_pseudoheader(wtap_dumper *wdh,
const union wtap_pseudo_header *pseudo_header, int *err)
{
guint8 mtp2_hdr[MTP2_HDR_LEN];
/*
* Write the MTP2 header.
*/
memset(&mtp2_hdr, 0, sizeof(mtp2_hdr));
mtp2_hdr[MTP2_SENT_OFFSET] = pseudo_header->mtp2.sent;
mtp2_hdr[MTP2_ANNEX_A_USED_OFFSET] = pseudo_header->mtp2.annex_a_used;
phtons(&mtp2_hdr[MTP2_LINK_NUMBER_OFFSET],
pseudo_header->mtp2.link_number);
if (!wtap_dump_file_write(wdh, mtp2_hdr, sizeof(mtp2_hdr), err))
return FALSE;
wdh->bytes_dumped += sizeof(mtp2_hdr);
return TRUE;
}
/*
* The fake link-layer header of LAPD packets.
*/
#ifndef ETH_P_LAPD
#define ETH_P_LAPD 0x0030
#endif
#define LAPD_SLL_PKTTYPE_OFFSET 0 /* packet type - 2 bytes */
#define LAPD_SLL_HATYPE_OFFSET 2 /* hardware address type - 2 bytes */
#define LAPD_SLL_HALEN_OFFSET 4 /* hardware address length - 2 bytes */
#define LAPD_SLL_ADDR_OFFSET 6 /* address - 8 bytes */
#define LAPD_SLL_PROTOCOL_OFFSET 14 /* protocol, should be ETH_P_LAPD - 2 bytes */
#define LAPD_SLL_LEN 16 /* length of the header */
static int
pcap_read_lapd_pseudoheader(FILE_T fh, union wtap_pseudo_header *pseudo_header,
guint packet_size, int *err, gchar **err_info)
{
guint8 lapd_phdr[LAPD_SLL_LEN];
if (packet_size < LAPD_SLL_LEN) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: LAPD file has a %u-byte packet, too small to have even a LAPD pseudo-header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, lapd_phdr, LAPD_SLL_LEN, err, err_info))
return -1;
if (pntoh16(&lapd_phdr[LAPD_SLL_PROTOCOL_OFFSET]) != ETH_P_LAPD) {
*err = WTAP_ERR_BAD_FILE;
if (err_info != NULL)
*err_info = g_strdup("pcap/pcapng: LAPD capture has a packet with an invalid sll_protocol field");
return -1;
}
pseudo_header->lapd.pkttype = pntoh16(&lapd_phdr[LAPD_SLL_PKTTYPE_OFFSET]);
pseudo_header->lapd.we_network = !!lapd_phdr[LAPD_SLL_ADDR_OFFSET+0];
return LAPD_SLL_LEN;
}
static gboolean
pcap_write_lapd_pseudoheader(wtap_dumper *wdh,
const union wtap_pseudo_header *pseudo_header, int *err)
{
guint8 lapd_hdr[LAPD_SLL_LEN];
/*
* Write the LAPD header.
*/
memset(&lapd_hdr, 0, sizeof(lapd_hdr));
phtons(&lapd_hdr[LAPD_SLL_PKTTYPE_OFFSET], pseudo_header->lapd.pkttype);
phtons(&lapd_hdr[LAPD_SLL_PROTOCOL_OFFSET], ETH_P_LAPD);
lapd_hdr[LAPD_SLL_ADDR_OFFSET + 0] =
pseudo_header->lapd.we_network?0x01:0x00;
if (!wtap_dump_file_write(wdh, lapd_hdr, sizeof(lapd_hdr), err))
return FALSE;
wdh->bytes_dumped += sizeof(lapd_hdr);
return TRUE;
}
/*
* A header containing additional SITA WAN information.
*/
#define SITA_FLAGS_OFFSET 0 /* 1 byte */
#define SITA_SIGNALS_OFFSET 1 /* 1 byte */
#define SITA_ERRORS1_OFFSET 2 /* 1 byte */
#define SITA_ERRORS2_OFFSET 3 /* 1 byte */
#define SITA_PROTO_OFFSET 4 /* 1 byte */
#define SITA_HDR_LEN 5 /* length of the header */
static int
pcap_read_sita_pseudoheader(FILE_T fh, union wtap_pseudo_header *pseudo_header,
guint packet_size, int *err, gchar **err_info)
{
guint8 sita_phdr[SITA_HDR_LEN];
if (packet_size < SITA_HDR_LEN) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: SITA file has a %u-byte packet, too small to have even a SITA pseudo-header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, sita_phdr, SITA_HDR_LEN, err, err_info))
return -1;
pseudo_header->sita.sita_flags = sita_phdr[SITA_FLAGS_OFFSET];
pseudo_header->sita.sita_signals = sita_phdr[SITA_SIGNALS_OFFSET];
pseudo_header->sita.sita_errors1 = sita_phdr[SITA_ERRORS1_OFFSET];
pseudo_header->sita.sita_errors2 = sita_phdr[SITA_ERRORS2_OFFSET];
pseudo_header->sita.sita_proto = sita_phdr[SITA_PROTO_OFFSET];
return SITA_HDR_LEN;
}
static gboolean
pcap_write_sita_pseudoheader(wtap_dumper *wdh,
const union wtap_pseudo_header *pseudo_header, int *err)
{
guint8 sita_hdr[SITA_HDR_LEN];
/*
* Write the SITA header.
*/
memset(&sita_hdr, 0, sizeof(sita_hdr));
sita_hdr[SITA_FLAGS_OFFSET] = pseudo_header->sita.sita_flags;
sita_hdr[SITA_SIGNALS_OFFSET] = pseudo_header->sita.sita_signals;
sita_hdr[SITA_ERRORS1_OFFSET] = pseudo_header->sita.sita_errors1;
sita_hdr[SITA_ERRORS2_OFFSET] = pseudo_header->sita.sita_errors2;
sita_hdr[SITA_PROTO_OFFSET] = pseudo_header->sita.sita_proto;
if (!wtap_dump_file_write(wdh, sita_hdr, sizeof(sita_hdr), err))
return FALSE;
wdh->bytes_dumped += sizeof(sita_hdr);
return TRUE;
}
/*
* Pseudo-header at the beginning of DLT_BLUETOOTH_HCI_H4_WITH_PHDR frames.
* Values in network byte order.
*/
struct pcap_bt_phdr {
guint32 direction; /* Bit 0 hold the frame direction. */
};
#define LIBPCAP_BT_PHDR_SENT 0
#define LIBPCAP_BT_PHDR_RECV 1
static int
pcap_read_bt_pseudoheader(FILE_T fh, union wtap_pseudo_header *pseudo_header,
guint packet_size, int *err, gchar **err_info)
{
struct pcap_bt_phdr phdr;
if (packet_size < sizeof (struct pcap_bt_phdr)) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: Bluetooth file has a %u-byte packet, too small to have even a pseudo-header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, &phdr, sizeof (struct pcap_bt_phdr),
err, err_info))
return -1;
pseudo_header->p2p.sent = ((g_ntohl(phdr.direction) & LIBPCAP_BT_PHDR_RECV) == 0)? TRUE: FALSE;
return (int)sizeof (struct pcap_bt_phdr);
}
static gboolean
pcap_write_bt_pseudoheader(wtap_dumper *wdh,
const union wtap_pseudo_header *pseudo_header, int *err)
{
guint32 direction;
struct pcap_bt_phdr bt_hdr;
direction = pseudo_header->p2p.sent ? LIBPCAP_BT_PHDR_SENT : LIBPCAP_BT_PHDR_RECV;
bt_hdr.direction = GUINT32_TO_BE(direction);
if (!wtap_dump_file_write(wdh, &bt_hdr, sizeof bt_hdr, err))
return FALSE;
wdh->bytes_dumped += sizeof bt_hdr;
return TRUE;
}
/*
* Pseudo-header at the beginning of DLT_BLUETOOTH_LINUX_MONITOR frames.
* Values in network byte order.
*/
struct pcap_bt_monitor_phdr {
guint16 adapter_id;
guint16 opcode;
};
static int
pcap_read_bt_monitor_pseudoheader(FILE_T fh,
union wtap_pseudo_header *pseudo_header, guint packet_size,
int *err, gchar **err_info)
{
struct pcap_bt_monitor_phdr phdr;
if (packet_size < sizeof (struct pcap_bt_monitor_phdr)) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: Bluetooth monitor file has a %u-byte packet, too small to have even a pseudo-header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, &phdr, sizeof (struct pcap_bt_monitor_phdr),
err, err_info))
return -1;
pseudo_header->btmon.adapter_id = g_ntohs(phdr.adapter_id);
pseudo_header->btmon.opcode = g_ntohs(phdr.opcode);
return (int)sizeof (struct pcap_bt_monitor_phdr);
}
static gboolean
pcap_write_bt_monitor_pseudoheader(wtap_dumper *wdh,
const union wtap_pseudo_header *pseudo_header, int *err)
{
struct pcap_bt_monitor_phdr bt_monitor_hdr;
bt_monitor_hdr.adapter_id = GUINT16_TO_BE(pseudo_header->btmon.adapter_id);
bt_monitor_hdr.opcode = GUINT16_TO_BE(pseudo_header->btmon.opcode);
if (!wtap_dump_file_write(wdh, &bt_monitor_hdr, sizeof bt_monitor_hdr, err))
return FALSE;
wdh->bytes_dumped += sizeof bt_monitor_hdr;
return TRUE;
}
/*
* The NFC LLCP per-packet header.
*/
#define LLCP_ADAPTER_OFFSET 0
#define LLCP_FLAGS_OFFSET 1
#define LLCP_HEADER_LEN 2
static int
pcap_read_llcp_pseudoheader(FILE_T fh,
union wtap_pseudo_header *pseudo_header, guint packet_size,
int *err, gchar **err_info)
{
guint8 phdr[LLCP_HEADER_LEN];
if (packet_size < LLCP_HEADER_LEN) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: NFC LLCP file has a %u-byte packet, too small to have even a pseudo-header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, phdr, LLCP_HEADER_LEN, err, err_info))
return -1;
pseudo_header->llcp.adapter = phdr[LLCP_ADAPTER_OFFSET];
pseudo_header->llcp.flags = phdr[LLCP_FLAGS_OFFSET];
return LLCP_HEADER_LEN;
}
static gboolean
pcap_write_llcp_pseudoheader(wtap_dumper *wdh,
const union wtap_pseudo_header *pseudo_header, int *err)
{
guint8 phdr[LLCP_HEADER_LEN];
phdr[LLCP_ADAPTER_OFFSET] = pseudo_header->llcp.adapter;
phdr[LLCP_FLAGS_OFFSET] = pseudo_header->llcp.flags;
if (!wtap_dump_file_write(wdh, &phdr, sizeof phdr, err))
return FALSE;
wdh->bytes_dumped += sizeof phdr;
return TRUE;
}
/*
* Pseudo-header at the beginning of DLT_PPP_WITH_DIR frames.
*/
struct pcap_ppp_phdr {
guint8 direction;
};
/*
* Pseudo-header at the beginning of DLT_PPP_WITH_DIR frames.
*/
static int
pcap_read_ppp_pseudoheader(FILE_T fh, union wtap_pseudo_header *pseudo_header,
guint packet_size, int *err, gchar **err_info)
{
struct pcap_ppp_phdr phdr;
if (packet_size < sizeof (struct pcap_ppp_phdr)) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: PPP file has a %u-byte packet, too small to have even a pseudo-header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, &phdr, sizeof (struct pcap_ppp_phdr),
err, err_info))
return -1;
/* Any non-zero value means "sent" */
pseudo_header->p2p.sent = (phdr.direction != 0) ? TRUE: FALSE;
return (int)sizeof (struct pcap_ppp_phdr);
}
static gboolean
pcap_write_ppp_pseudoheader(wtap_dumper *wdh,
const union wtap_pseudo_header *pseudo_header, int *err)
{
struct pcap_ppp_phdr ppp_hdr;
/* Any non-zero value means "sent" */
ppp_hdr.direction = (pseudo_header->p2p.sent ? 1 : 0);
if (!wtap_dump_file_write(wdh, &ppp_hdr, sizeof ppp_hdr, err))
return FALSE;
wdh->bytes_dumped += sizeof ppp_hdr;
return TRUE;
}
static int
pcap_read_erf_pseudoheader(FILE_T fh, wtap_rec *rec,
union wtap_pseudo_header *pseudo_header, guint packet_size,
int *err, gchar **err_info)
{
guint8 erf_hdr[sizeof(struct erf_phdr)];
guint8 erf_subhdr[sizeof(union erf_subhdr)];
int phdr_len;
if (packet_size < sizeof(struct erf_phdr)) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: ERF file has a %u-byte packet, too small to have even an ERF pseudo-header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, erf_hdr, sizeof(struct erf_phdr), err, err_info))
return -1;
phdr_len = (int)sizeof(struct erf_phdr);
pseudo_header->erf.phdr.ts = pletoh64(&erf_hdr[0]); /* timestamp */
pseudo_header->erf.phdr.type = erf_hdr[8];
pseudo_header->erf.phdr.flags = erf_hdr[9];
pseudo_header->erf.phdr.rlen = pntoh16(&erf_hdr[10]);
pseudo_header->erf.phdr.lctr = pntoh16(&erf_hdr[12]);
pseudo_header->erf.phdr.wlen = pntoh16(&erf_hdr[14]);
/* The high 32 bits of the timestamp contain the integer number of seconds
* while the lower 32 bits contain the binary fraction of the second.
* This allows an ultimate resolution of 1/(2^32) seconds, or approximately 233 picoseconds */
if (rec) {
guint64 ts = pseudo_header->erf.phdr.ts;
rec->ts.secs = (guint32) (ts >> 32);
ts = ((ts & 0xffffffff) * 1000 * 1000 * 1000);
ts += (ts & 0x80000000) << 1; /* rounding */
rec->ts.nsecs = ((guint32) (ts >> 32));
if (rec->ts.nsecs >= 1000000000) {
rec->ts.nsecs -= 1000000000;
rec->ts.secs += 1;
}
}
/*
* If the type of record given in the pseudo header indicates
* the presence of an extension header, then read all the
* extension headers.
*/
if (pseudo_header->erf.phdr.type & 0x80) {
int i = 0, max = sizeof(pseudo_header->erf.ehdr_list)/sizeof(struct erf_ehdr);
guint8 erf_exhdr[8];
guint8 type;
do {
if (phdr_len > INT_MAX - 8) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: ERF file has a packet larger than %d bytes",
INT_MAX);
return -1;
}
if (packet_size < (guint)phdr_len + 8) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: ERF file has a %u-byte packet, too small to include the extension headers",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, erf_exhdr, 8, err, err_info))
return -1;
type = erf_exhdr[0];
if (i < max) {
guint64 erf_exhdr_sw;
erf_exhdr_sw = pntoh64(erf_exhdr);
memcpy(&pseudo_header->erf.ehdr_list[i].ehdr, &erf_exhdr_sw, sizeof(erf_exhdr_sw));
}
phdr_len += 8;
i++;
} while (type & 0x80);
}
/* check the optional subheader */
switch (pseudo_header->erf.phdr.type & 0x7F) {
case ERF_TYPE_MC_HDLC:
case ERF_TYPE_MC_RAW:
case ERF_TYPE_MC_ATM:
case ERF_TYPE_MC_RAW_CHANNEL:
case ERF_TYPE_MC_AAL5:
case ERF_TYPE_MC_AAL2:
case ERF_TYPE_COLOR_MC_HDLC_POS:
/* Extract the Multi Channel header to include it in the pseudo header part */
if (phdr_len > INT_MAX - (int)sizeof(erf_mc_header_t)) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: ERF file has a packet larger than %d bytes",
INT_MAX);
return -1;
}
if (packet_size < (guint)(phdr_len + (int)sizeof(erf_mc_header_t))) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: ERF file has a %u-byte packet, too small to include the Multi Channel header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, erf_subhdr, sizeof(erf_mc_header_t), err, err_info))
return -1;
pseudo_header->erf.subhdr.mc_hdr = pntoh32(&erf_subhdr[0]);
phdr_len += sizeof(erf_mc_header_t);
break;
case ERF_TYPE_AAL2:
/* Extract the AAL2 header to include it in the pseudo header part */
if (phdr_len > INT_MAX - (int)sizeof(erf_aal2_header_t)) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: ERF file has a packet larger than %d bytes",
INT_MAX);
return -1;
}
if (packet_size < (guint)(phdr_len + (int)sizeof(erf_aal2_header_t))) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: ERF file has a %u-byte packet, too small to include the AAL2 header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, erf_subhdr, sizeof(erf_aal2_header_t), err, err_info))
return -1;
pseudo_header->erf.subhdr.aal2_hdr = pntoh32(&erf_subhdr[0]);
phdr_len += sizeof(erf_aal2_header_t);
break;
case ERF_TYPE_ETH:
case ERF_TYPE_COLOR_ETH:
case ERF_TYPE_DSM_COLOR_ETH:
case ERF_TYPE_COLOR_HASH_ETH:
/* Extract the Ethernet additional header to include it in the pseudo header part */
if (phdr_len > INT_MAX - (int)sizeof(erf_eth_header_t)) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: ERF file has a packet larger than %d bytes",
INT_MAX);
return -1;
}
if (packet_size < (guint)(phdr_len + (int)sizeof(erf_eth_header_t))) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: ERF file has a %u-byte packet, too small to include the Ethernet additional header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, erf_subhdr, sizeof(erf_eth_header_t), err, err_info))
return -1;
memcpy(&pseudo_header->erf.subhdr.eth_hdr, erf_subhdr, sizeof pseudo_header->erf.subhdr.eth_hdr);
phdr_len += sizeof(erf_eth_header_t);
break;
default:
/* No optional pseudo header for this ERF type */
break;
}
return phdr_len;
}
static gboolean
pcap_write_erf_pseudoheader(wtap_dumper *wdh,
const union wtap_pseudo_header *pseudo_header, int *err)
{
guint8 erf_hdr[sizeof(struct erf_phdr)];
guint8 erf_subhdr[sizeof(union erf_subhdr)];
/*
* Write the ERF header.
*/
memset(&erf_hdr, 0, sizeof(erf_hdr));
phtolell(&erf_hdr[0], pseudo_header->erf.phdr.ts);
erf_hdr[8] = pseudo_header->erf.phdr.type;
erf_hdr[9] = pseudo_header->erf.phdr.flags;
/*
* Recalculate rlen as padding (and maybe extension headers)
* have been stripped from caplen.
*
* XXX: Since we don't have rec->rec_header.packet_header.caplen
* here, assume caplen was calculated correctly and
* recalculate from wlen.
*/
phtons(&erf_hdr[10],
MIN(pseudo_header->erf.phdr.rlen, pseudo_header->erf.phdr.wlen + pcap_get_phdr_size(WTAP_ENCAP_ERF, pseudo_header)));
phtons(&erf_hdr[12], pseudo_header->erf.phdr.lctr);
phtons(&erf_hdr[14], pseudo_header->erf.phdr.wlen);
if (!wtap_dump_file_write(wdh, erf_hdr, sizeof(struct erf_phdr), err))
return FALSE;
wdh->bytes_dumped += sizeof(struct erf_phdr);
/*
* Now write out the extension headers.
*/
if (pseudo_header->erf.phdr.type & 0x80) {
int i = 0, max = sizeof(pseudo_header->erf.ehdr_list)/sizeof(struct erf_ehdr);
guint8 erf_exhdr[8];
guint8 type;
do {
phtonll(erf_exhdr, pseudo_header->erf.ehdr_list[i].ehdr);
type = erf_exhdr[0];
/* Clear more extension headers bit if > 8 */
if(i == max-1)
erf_exhdr[0] = erf_exhdr[0] & 0x7F;
if (!wtap_dump_file_write(wdh, erf_exhdr, 8, err))
return FALSE;
wdh->bytes_dumped += 8;
i++;
} while (type & 0x80 && i < max);
}
/*
* Now write out the subheader, if any
*/
switch (pseudo_header->erf.phdr.type & 0x7F) {
case ERF_TYPE_MC_HDLC:
case ERF_TYPE_MC_RAW:
case ERF_TYPE_MC_ATM:
case ERF_TYPE_MC_RAW_CHANNEL:
case ERF_TYPE_MC_AAL5:
case ERF_TYPE_MC_AAL2:
case ERF_TYPE_COLOR_MC_HDLC_POS:
phtonl(&erf_subhdr[0], pseudo_header->erf.subhdr.mc_hdr);
if (!wtap_dump_file_write(wdh, erf_subhdr,
sizeof(struct erf_mc_hdr), err))
return FALSE;
wdh->bytes_dumped += sizeof(struct erf_mc_hdr);;
break;
case ERF_TYPE_AAL2:
phtonl(&erf_subhdr[0], pseudo_header->erf.subhdr.aal2_hdr);
if (!wtap_dump_file_write(wdh, erf_subhdr,
sizeof(struct erf_aal2_hdr), err))
return FALSE;
wdh->bytes_dumped += sizeof(struct erf_aal2_hdr);;
break;
case ERF_TYPE_ETH:
case ERF_TYPE_COLOR_ETH:
case ERF_TYPE_DSM_COLOR_ETH:
case ERF_TYPE_COLOR_HASH_ETH:
memcpy(&erf_subhdr[0], &pseudo_header->erf.subhdr.eth_hdr, sizeof pseudo_header->erf.subhdr.eth_hdr);
if (!wtap_dump_file_write(wdh, erf_subhdr,
sizeof(struct erf_eth_hdr), err))
return FALSE;
wdh->bytes_dumped += sizeof(struct erf_eth_hdr);
break;
default:
break;
}
return TRUE;
}
/*
* I2C-with=Linux-pseudoheader link-layer on-disk format, as defined by
* Pigeon Point Systems.
*/
struct i2c_linux_file_hdr {
guint8 bus;
guint8 flags[4];
};
static int
pcap_read_i2c_linux_pseudoheader(FILE_T fh, union wtap_pseudo_header *pseudo_header,
guint packet_size, int *err, gchar **err_info)
{
struct i2c_linux_file_hdr i2c_linux_hdr;
if (packet_size < sizeof (struct i2c_linux_file_hdr)) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcap/pcapng: I2C file has a %u-byte packet, too small to have even a I2C pseudo-header",
packet_size);
return -1;
}
if (!wtap_read_bytes(fh, &i2c_linux_hdr, sizeof (i2c_linux_hdr), err, err_info))
return -1;
pseudo_header->i2c.is_event = i2c_linux_hdr.bus & 0x80 ? 1 : 0;
pseudo_header->i2c.bus = i2c_linux_hdr.bus & 0x7f;
pseudo_header->i2c.flags = pntoh32(&i2c_linux_hdr.flags);
return (int)sizeof (struct i2c_linux_file_hdr);
}
static gboolean
pcap_write_i2c_linux_pseudoheader(wtap_dumper *wdh,
const union wtap_pseudo_header *pseudo_header, int *err)
{
struct i2c_linux_file_hdr i2c_linux_hdr;
/*
* Write the I2C Linux-specific pseudo-header.
*/
memset(&i2c_linux_hdr, 0, sizeof(i2c_linux_hdr));
i2c_linux_hdr.bus = pseudo_header->i2c.bus |
(pseudo_header->i2c.is_event ? 0x80 : 0x00);
phtonl((guint8 *)&i2c_linux_hdr.flags, pseudo_header->i2c.flags);
if (!wtap_dump_file_write(wdh, &i2c_linux_hdr, sizeof(i2c_linux_hdr), err))
return FALSE;
wdh->bytes_dumped += sizeof(i2c_linux_hdr);
return TRUE;
}
/*
* The link-layer header on Nokia IPSO packets.
*/
#define NOKIA_LEN 4 /* length of the header */
static gboolean
pcap_read_nokia_pseudoheader(FILE_T fh,
union wtap_pseudo_header *pseudo_header, int *err, gchar **err_info)
{
guint8 phdr[NOKIA_LEN];
/* backtrack to read the 4 mysterious bytes that aren't considered
* part of the packet size
*/
if (file_seek(fh, -NOKIA_LEN, SEEK_CUR, err) == -1)
{
*err = file_error(fh, err_info);
if (*err == 0)
*err = WTAP_ERR_SHORT_READ;
return FALSE;
}
if (!wtap_read_bytes(fh, phdr, NOKIA_LEN, err, err_info))
return FALSE;
memcpy(pseudo_header->nokia.stuff, phdr, NOKIA_LEN);
return TRUE;
}
/*
* When not using the memory-mapped interface to capture USB events,
* code that reads those events can use the MON_IOCX_GET ioctl to
* read a 48-byte header consisting of a "struct linux_usb_phdr", as
* defined below, followed immediately by one of:
*
* 8 bytes of a "struct usb_device_setup_hdr", if "setup_flag"
* in the preceding "struct linux_usb_phdr" is 0;
*
* in Linux 2.6.30 or later, 8 bytes of a "struct iso_rec", if
* this is an isochronous transfer;
*
* 8 bytes of junk, otherwise.
*
* In Linux 2.6.31 and later, it can also use the MON_IOCX_GETX ioctl
* to read a 64-byte header; that header consists of the 48 bytes
* above, followed immediately by 16 bytes of a "struct linux_usb_phdr_ext",
* as defined below.
*
* In Linux 2.6.21 and later, there's a memory-mapped interface to
* capture USB events. In that interface, the events in the memory-mapped
* buffer have a 64-byte header, followed immediately by the data.
* In Linux 2.6.21 through 2.6.30.x, the 64-byte header is the 48-byte
* header described above, followed by 16 bytes of zeroes; in Linux
* 2.6.31 and later, the 64-byte header is the 64-byte header described
* above.
*
* See linux/Documentation/usb/usbmon.txt and libpcap/pcap/usb.h for details.
*
* With WTAP_ENCAP_USB_LINUX, packets have the 48-byte header; with
* WTAP_ENCAP_USB_LINUX_MMAPPED, they have the 64-byte header. There
* is no indication of whether the header has the "struct iso_rec", or
* whether the last 16 bytes of a 64-byte header are all zeros or are
* a "struct linux_usb_phdr_ext".
*/
/*
* URB transfer_type values
*/
#define URB_ISOCHRONOUS 0x0
#define URB_INTERRUPT 0x1
#define URB_CONTROL 0x2
#define URB_BULK 0x3
/*
* Information from the URB for Isochronous transfers.
*
* This structure is 8 bytes long.
*/
struct iso_rec {
gint32 error_count;
gint32 numdesc;
};
/*
* Header prepended by Linux kernel to each USB event.
*
* (Setup flag is '-', 'D', 'Z', or 0. Data flag is '<', '>', 'Z', or 0.)
*
* The values are in *host* byte order.
*/
struct linux_usb_phdr {
guint64 id; /* urb id, to link submission and completion events */
guint8 event_type; /* Submit ('S'), Completed ('C'), Error ('E') */
guint8 transfer_type; /* ISO (0), Intr, Control, Bulk (3) */
guint8 endpoint_number; /* Endpoint number (0-15) and transfer direction */
guint8 device_address; /* 0-127 */
guint16 bus_id;
gint8 setup_flag; /* 0, if the urb setup header is meaningful */
gint8 data_flag; /* 0, if urb data is present */
gint64 ts_sec;
gint32 ts_usec;
gint32 status;
guint32 urb_len; /* whole len of urb this event refers to */
guint32 data_len; /* amount of urb data really present in this event */
/*
* Packet-type-dependent data.
* USB setup information of setup_flag is true.
* Otherwise, some isochronous transfer information.
*/
union {
guint8 data[8];
struct iso_rec iso;
} s;
/*
* This data is provided by Linux 2.6.31 and later kernels.
*
* For WTAP_ENCAP_USB_LINUX, it's not in the pseudo-header, so
* the pseudo-header is always 48 bytes long, including the
* packet-type-dependent data.
*
* For WTAP_ENCAP_USB_LINUX_MMAPPED, the pseudo-header is always
* 64 bytes long, with the packet-type-dependent data preceding
* these last 16 bytes. In pre-2.6.31 kernels, it's zero padding;
* in 2.6.31 and later, it's the following data.
*/
gint32 interval; /* only for Interrupt and Isochronous events */
gint32 start_frame; /* for Isochronous */
guint32 xfer_flags; /* copy of URB's transfer_flags */
guint32 ndesc; /* actual number of isochronous descriptors */
};
struct linux_usb_isodesc {
gint32 iso_status;
guint32 iso_off;
guint32 iso_len;
guint32 _pad;
};
/*
* USB setup header as defined in USB specification
* See usb_20.pdf, Chapter 9.3 'USB Device Requests' for details.
* https://www.usb.org/document-library/usb-20-specification
*
* This structure is 8 bytes long.
*/
struct usb_device_setup_hdr {
gint8 bmRequestType;
guint8 bRequest;
guint16 wValue;
guint16 wIndex;
guint16 wLength;
};
/*
* Offset of the *end* of a field within a particular structure.
*/
#define END_OFFSETOF(basep, fieldp) \
(((char *)(void *)(fieldp)) - ((char *)(void *)(basep)) + \
sizeof(*fieldp))
/*
* Is that offset within the bounds of the packet?
*/
#define WITHIN_PACKET(basep, fieldp) \
(packet_size >= END_OFFSETOF((basep), (fieldp)))
#define CHECK_AND_SWAP16(fieldp) \
{ \
if (!WITHIN_PACKET(usb_phdr, fieldp)) \
return; \
PBSWAP16((guint8 *)fieldp); \
}
#define CHECK_AND_SWAP32(fieldp) \
{ \
if (!WITHIN_PACKET(usb_phdr, fieldp)) \
return; \
PBSWAP32((guint8 *)fieldp); \
}
#define CHECK_AND_SWAP64(fieldp) \
{ \
if (!WITHIN_PACKET(usb_phdr, fieldp)) \
return; \
PBSWAP64((guint8 *)fieldp); \
}
struct can_socketcan_hdr {
guint32 can_id; /* CAN ID and flags */
guint8 payload_length; /* Frame payload length */
guint8 padding;
guint8 reserved1;
guint8 reserved2;
};
/*
* The fake link-layer header of Linux cooked packets.
*/
#define LINUX_SLL_PROTOCOL_OFFSET 14 /* protocol */
#define LINUX_SLL_LEN 16 /* length of the header */
/*
* The protocols we have to check for.
*/
#define LINUX_SLL_P_CAN 0x000C /* Controller Area Network */
#define LINUX_SLL_P_CANFD 0x000D /* Controller Area Network flexible data rate */
static void
pcap_byteswap_linux_sll_pseudoheader(wtap_rec *rec, guint8 *pd)
{
guint packet_size;
guint16 protocol;
struct can_socketcan_hdr *can_socketcan_phdr;
/*
* Minimum of captured and actual length (just in case the
* actual length < the captured length, which Should Never
* Happen).
*/
packet_size = rec->rec_header.packet_header.caplen;
if (packet_size > rec->rec_header.packet_header.len)
packet_size = rec->rec_header.packet_header.len;
if (packet_size < LINUX_SLL_LEN) {
/* Not enough data to have the protocol */
return;
}
protocol = pntoh16(&pd[LINUX_SLL_PROTOCOL_OFFSET]);
if (protocol != LINUX_SLL_P_CAN && protocol != LINUX_SLL_P_CANFD) {
/* Not a CAN packet; nothing to fix */
return;
}
/*
* Greasy hack, but we never directly dereference any of
* the fields in *can_socketcan_phdr, we just get offsets
* of and addresses of its members and byte-swap it with a
* byte-at-a-time macro, so it's alignment-safe.
*/
can_socketcan_phdr = (struct can_socketcan_hdr *)(void *)(pd + LINUX_SLL_LEN);
if (packet_size < LINUX_SLL_LEN + sizeof(can_socketcan_phdr->can_id)) {
/* Not enough data to have the full CAN ID */
return;
}
PBSWAP32((guint8 *)&can_socketcan_phdr->can_id);
}
static void
pcap_byteswap_linux_usb_pseudoheader(wtap_rec *rec, guint8 *pd,
gboolean header_len_64_bytes)
{
guint packet_size;
struct linux_usb_phdr *usb_phdr;
struct linux_usb_isodesc *pisodesc;
gint32 iso_numdesc, i;
/*
* Minimum of captured and actual length (just in case the
* actual length < the captured length, which Should Never
* Happen).
*/
packet_size = rec->rec_header.packet_header.caplen;
if (packet_size > rec->rec_header.packet_header.len)
packet_size = rec->rec_header.packet_header.len;
/*
* Greasy hack, but we never directly dereference any of
* the fields in *usb_phdr, we just get offsets of and
* addresses of its members and byte-swap it with a
* byte-at-a-time macro, so it's alignment-safe.
*/
usb_phdr = (struct linux_usb_phdr *)(void *)pd;
CHECK_AND_SWAP64(&usb_phdr->id);
CHECK_AND_SWAP16(&usb_phdr->bus_id);
CHECK_AND_SWAP64(&usb_phdr->ts_sec);
CHECK_AND_SWAP32(&usb_phdr->ts_usec);
CHECK_AND_SWAP32(&usb_phdr->status);
CHECK_AND_SWAP32(&usb_phdr->urb_len);
CHECK_AND_SWAP32(&usb_phdr->data_len);
if (usb_phdr->transfer_type == URB_ISOCHRONOUS) {
CHECK_AND_SWAP32(&usb_phdr->s.iso.error_count);
CHECK_AND_SWAP32(&usb_phdr->s.iso.numdesc);
}
if (header_len_64_bytes) {
/*
* This is either the "version 1" header, with
* 16 bytes of additional fields at the end, or
* a "version 0" header from a memory-mapped
* capture, with 16 bytes of zeroed-out padding
* at the end. Byte swap them as if this were
* a "version 1" header.
*
* Yes, the first argument to END_OFFSETOF() should
* be usb_phdr, not usb_phdr_ext; we want the offset of
* the additional fields from the beginning of
* the packet.
*/
CHECK_AND_SWAP32(&usb_phdr->interval);
CHECK_AND_SWAP32(&usb_phdr->start_frame);
CHECK_AND_SWAP32(&usb_phdr->xfer_flags);
CHECK_AND_SWAP32(&usb_phdr->ndesc);
}
if (usb_phdr->transfer_type == URB_ISOCHRONOUS) {
/* swap the values in struct linux_usb_isodesc */
/*
* See previous "Greasy hack" comment.
*/
if (header_len_64_bytes) {
pisodesc = (struct linux_usb_isodesc*)(void *)(pd + 64);
} else {
pisodesc = (struct linux_usb_isodesc*)(void *)(pd + 48);
}
iso_numdesc = usb_phdr->s.iso.numdesc;
for (i = 0; i < iso_numdesc; i++) {
CHECK_AND_SWAP32(&pisodesc->iso_status);
CHECK_AND_SWAP32(&pisodesc->iso_off);
CHECK_AND_SWAP32(&pisodesc->iso_len);
CHECK_AND_SWAP32(&pisodesc->_pad);
pisodesc++;
}
}
}
struct nflog_hdr {
guint8 nflog_family; /* address family */
guint8 nflog_version; /* version */
guint16 nflog_rid; /* resource ID */
};
struct nflog_tlv {
guint16 tlv_length; /* tlv length */
guint16 tlv_type; /* tlv type */
/* value follows this */
};
static void
pcap_byteswap_nflog_pseudoheader(wtap_rec *rec, guint8 *pd)
{
guint packet_size;
guint8 *p;
struct nflog_hdr *nfhdr;
struct nflog_tlv *tlv;
guint size;
/*
* Minimum of captured and actual length (just in case the
* actual length < the captured length, which Should Never
* Happen).
*/
packet_size = rec->rec_header.packet_header.caplen;
if (packet_size > rec->rec_header.packet_header.len)
packet_size = rec->rec_header.packet_header.len;
if (packet_size < sizeof(struct nflog_hdr)) {
/* Not enough data to have any TLVs. */
return;
}
p = pd;
nfhdr = (struct nflog_hdr *)pd;
if (nfhdr->nflog_version != 0) {
/* Unknown NFLOG version */
return;
}
packet_size -= (guint)sizeof(struct nflog_hdr);
p += sizeof(struct nflog_hdr);
while (packet_size >= sizeof(struct nflog_tlv)) {
tlv = (struct nflog_tlv *) p;
/* Swap the type and length. */
PBSWAP16((guint8 *)&tlv->tlv_type);
PBSWAP16((guint8 *)&tlv->tlv_length);
/* Get the length of the TLV. */
size = tlv->tlv_length;
if (size % 4 != 0)
size += 4 - size % 4;
/* Is the TLV's length less than the minimum? */
if (size < sizeof(struct nflog_tlv)) {
/* Yes. Give up now. */
return;
}
/* Do we have enough data for the full TLV? */
if (packet_size < size) {
/* No. */
return;
}
/* Skip over the TLV. */
packet_size -= size;
p += size;
}
}
int
pcap_process_pseudo_header(FILE_T fh, int file_type, int wtap_encap,
guint packet_size, wtap_rec *rec, int *err, gchar **err_info)
{
int phdr_len = 0;
switch (wtap_encap) {
case WTAP_ENCAP_ATM_PDUS:
if (file_type == WTAP_FILE_TYPE_SUBTYPE_PCAP_NOKIA) {
/*
* Nokia IPSO ATM.
*/
phdr_len = pcap_read_nokiaatm_pseudoheader(fh,
&rec->rec_header.packet_header.pseudo_header,
packet_size, err, err_info);
if (phdr_len == -1)
return -1; /* Read error */
} else {
/*
* SunATM.
*/
phdr_len = pcap_read_sunatm_pseudoheader(fh,
&rec->rec_header.packet_header.pseudo_header,
packet_size, err, err_info);
if (phdr_len == -1)
return -1; /* Read error */
}
break;
case WTAP_ENCAP_ETHERNET:
if (file_type == WTAP_FILE_TYPE_SUBTYPE_PCAP_NOKIA) {
/*
* Nokia IPSO. Pseudo header has already been read, but it's not considered
* part of the packet size, so reread it to store the data for later (when saving)
*/
if (!pcap_read_nokia_pseudoheader(fh, &rec->rec_header.packet_header.pseudo_header, err, err_info))
return -1; /* Read error */
}
/*
* We don't know whether there's an FCS in this frame or not.
*/
rec->rec_header.packet_header.pseudo_header.eth.fcs_len = -1;
break;
case WTAP_ENCAP_IEEE_802_11:
case WTAP_ENCAP_IEEE_802_11_PRISM:
case WTAP_ENCAP_IEEE_802_11_RADIOTAP:
case WTAP_ENCAP_IEEE_802_11_AVS:
/*
* We don't know whether there's an FCS in this frame or not,
* at least in pcap files. For radiotap, that's indicated in
* the radiotap header.
*
* XXX - in pcapng, there *could* be a packet option
* indicating the FCS length.
*/
memset(&rec->rec_header.packet_header.pseudo_header.ieee_802_11, 0, sizeof(rec->rec_header.packet_header.pseudo_header.ieee_802_11));
rec->rec_header.packet_header.pseudo_header.ieee_802_11.fcs_len = -1;
rec->rec_header.packet_header.pseudo_header.ieee_802_11.decrypted = FALSE;
rec->rec_header.packet_header.pseudo_header.ieee_802_11.datapad = FALSE;
break;
case WTAP_ENCAP_IRDA:
phdr_len = pcap_read_irda_pseudoheader(fh,
&rec->rec_header.packet_header.pseudo_header,
packet_size, err, err_info);
if (phdr_len == -1)
return -1; /* Read error */
break;
case WTAP_ENCAP_MTP2_WITH_PHDR:
phdr_len = pcap_read_mtp2_pseudoheader(fh,
&rec->rec_header.packet_header.pseudo_header,
packet_size, err, err_info);
if (phdr_len == -1)
return -1; /* Read error */
break;
case WTAP_ENCAP_LINUX_LAPD:
phdr_len = pcap_read_lapd_pseudoheader(fh,
&rec->rec_header.packet_header.pseudo_header,
packet_size, err, err_info);
if (phdr_len == -1)
return -1; /* Read error */
break;
case WTAP_ENCAP_SITA:
phdr_len = pcap_read_sita_pseudoheader(fh,
&rec->rec_header.packet_header.pseudo_header,
packet_size, err, err_info);
if (phdr_len == -1)
return -1; /* Read error */
break;
case WTAP_ENCAP_BLUETOOTH_H4:
/* We don't have pseudoheader, so just pretend we received everything. */
rec->rec_header.packet_header.pseudo_header.p2p.sent = FALSE;
break;
case WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR:
phdr_len = pcap_read_bt_pseudoheader(fh,
&rec->rec_header.packet_header.pseudo_header,
packet_size, err, err_info);
if (phdr_len == -1)
return -1; /* Read error */
break;
case WTAP_ENCAP_BLUETOOTH_LINUX_MONITOR:
phdr_len = pcap_read_bt_monitor_pseudoheader(fh,
&rec->rec_header.packet_header.pseudo_header,
packet_size, err, err_info);
if (phdr_len == -1)
return -1; /* Read error */
break;
case WTAP_ENCAP_NFC_LLCP:
phdr_len = pcap_read_llcp_pseudoheader(fh,
&rec->rec_header.packet_header.pseudo_header,
packet_size, err, err_info);
if (phdr_len == -1)
return -1; /* Read error */
break;
case WTAP_ENCAP_PPP_WITH_PHDR:
phdr_len = pcap_read_ppp_pseudoheader(fh,
&rec->rec_header.packet_header.pseudo_header,
packet_size, err, err_info);
if (phdr_len == -1)
return -1; /* Read error */
break;
case WTAP_ENCAP_ERF:
phdr_len = pcap_read_erf_pseudoheader(fh, rec,
&rec->rec_header.packet_header.pseudo_header,
packet_size, err, err_info);
if (phdr_len == -1)
return -1; /* Read error */
break;
case WTAP_ENCAP_I2C_LINUX:
phdr_len = pcap_read_i2c_linux_pseudoheader(fh,
&rec->rec_header.packet_header.pseudo_header,
packet_size, err, err_info);
if (phdr_len == -1)
return -1; /* Read error */
break;
}
return phdr_len;
}
void
pcap_read_post_process(int file_type, int wtap_encap,
wtap_rec *rec, guint8 *pd, gboolean bytes_swapped, int fcs_len)
{
switch (wtap_encap) {
case WTAP_ENCAP_ATM_PDUS:
if (file_type == WTAP_FILE_TYPE_SUBTYPE_PCAP_NOKIA) {
/*
* Nokia IPSO ATM.
*
* Guess the traffic type based on the packet
* contents.
*/
atm_guess_traffic_type(rec, pd);
} else {
/*
* SunATM.
*
* If this is ATM LANE traffic, try to guess what
* type of LANE traffic it is based on the packet
* contents.
*/
if (rec->rec_header.packet_header.pseudo_header.atm.type == TRAF_LANE)
atm_guess_lane_type(rec, pd);
}
break;
case WTAP_ENCAP_ETHERNET:
rec->rec_header.packet_header.pseudo_header.eth.fcs_len = fcs_len;
break;
case WTAP_ENCAP_SLL:
if (bytes_swapped)
pcap_byteswap_linux_sll_pseudoheader(rec, pd);
break;
case WTAP_ENCAP_USB_LINUX:
if (bytes_swapped)
pcap_byteswap_linux_usb_pseudoheader(rec, pd, FALSE);
break;
case WTAP_ENCAP_USB_LINUX_MMAPPED:
if (bytes_swapped)
pcap_byteswap_linux_usb_pseudoheader(rec, pd, TRUE);
break;
case WTAP_ENCAP_NETANALYZER:
/*
* Not strictly necessary, as the netANALYZER
* dissector calls the "Ethernet with FCS"
* dissector, but we might as well set it.
*/
rec->rec_header.packet_header.pseudo_header.eth.fcs_len = 4;
break;
case WTAP_ENCAP_NFLOG:
if (bytes_swapped)
pcap_byteswap_nflog_pseudoheader(rec, pd);
break;
case WTAP_ENCAP_ERF:
/*
* Update packet size to account for ERF padding and snapping.
* Captured length is minimum of wlen and previously calculated
* caplen (which would have included padding but not phdr).
*/
rec->rec_header.packet_header.len = rec->rec_header.packet_header.pseudo_header.erf.phdr.wlen;
rec->rec_header.packet_header.caplen = MIN(rec->rec_header.packet_header.len, rec->rec_header.packet_header.caplen);
break;
default:
break;
}
}
gboolean
wtap_encap_requires_phdr(int wtap_encap)
{
switch (wtap_encap) {
case WTAP_ENCAP_ATM_PDUS:
case WTAP_ENCAP_IRDA:
case WTAP_ENCAP_MTP2_WITH_PHDR:
case WTAP_ENCAP_LINUX_LAPD:
case WTAP_ENCAP_SITA:
case WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR:
case WTAP_ENCAP_BLUETOOTH_LINUX_MONITOR:
case WTAP_ENCAP_NFC_LLCP:
case WTAP_ENCAP_PPP_WITH_PHDR:
case WTAP_ENCAP_ERF:
case WTAP_ENCAP_I2C_LINUX:
return TRUE;
}
return FALSE;
}
int
pcap_get_phdr_size(int encap, const union wtap_pseudo_header *pseudo_header)
{
int hdrsize;
switch (encap) {
case WTAP_ENCAP_ATM_PDUS:
hdrsize = SUNATM_LEN;
break;
case WTAP_ENCAP_IRDA:
hdrsize = IRDA_SLL_LEN;
break;
case WTAP_ENCAP_MTP2_WITH_PHDR:
hdrsize = MTP2_HDR_LEN;
break;
case WTAP_ENCAP_LINUX_LAPD:
hdrsize = LAPD_SLL_LEN;
break;
case WTAP_ENCAP_SITA:
hdrsize = SITA_HDR_LEN;
break;
case WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR:
hdrsize = (int)sizeof (struct pcap_bt_phdr);
break;
case WTAP_ENCAP_BLUETOOTH_LINUX_MONITOR:
hdrsize = (int)sizeof (struct pcap_bt_monitor_phdr);
break;
case WTAP_ENCAP_NFC_LLCP:
hdrsize = LLCP_HEADER_LEN;
break;
case WTAP_ENCAP_PPP_WITH_PHDR:
hdrsize = (int)sizeof (struct pcap_ppp_phdr);
break;
case WTAP_ENCAP_ERF:
hdrsize = (int)sizeof (struct erf_phdr);
/*
* If the type of record given in the pseudo header
* indicates the presence of an extension header, then
* add in the lengths of the extension headers.
*/
if (pseudo_header->erf.phdr.type & 0x80) {
int i = 0, max = sizeof(pseudo_header->erf.ehdr_list)/sizeof(struct erf_ehdr);
guint8 erf_exhdr[8];
guint8 type;
do {
phtonll(erf_exhdr, pseudo_header->erf.ehdr_list[i].ehdr);
type = erf_exhdr[0];
hdrsize += 8;
i++;
} while (type & 0x80 && i < max);
}
/*
* Now add in the length of the subheader, if any.
*/
switch (pseudo_header->erf.phdr.type & 0x7F) {
case ERF_TYPE_MC_HDLC:
case ERF_TYPE_MC_RAW:
case ERF_TYPE_MC_ATM:
case ERF_TYPE_MC_RAW_CHANNEL:
case ERF_TYPE_MC_AAL5:
case ERF_TYPE_MC_AAL2:
case ERF_TYPE_COLOR_MC_HDLC_POS:
hdrsize += (int)sizeof(struct erf_mc_hdr);
break;
case ERF_TYPE_AAL2:
hdrsize += (int)sizeof(struct erf_aal2_hdr);
break;
case ERF_TYPE_ETH:
case ERF_TYPE_COLOR_ETH:
case ERF_TYPE_DSM_COLOR_ETH:
case ERF_TYPE_COLOR_HASH_ETH:
hdrsize += (int)sizeof(struct erf_eth_hdr);
break;
default:
break;
}
break;
case WTAP_ENCAP_I2C_LINUX:
hdrsize = (int)sizeof (struct i2c_linux_file_hdr);
break;
default:
hdrsize = 0;
break;
}
return hdrsize;
}
gboolean
pcap_write_phdr(wtap_dumper *wdh, int encap, const union wtap_pseudo_header *pseudo_header,
int *err)
{
switch (encap) {
case WTAP_ENCAP_ATM_PDUS:
if (!pcap_write_sunatm_pseudoheader(wdh, pseudo_header, err))
return FALSE;
break;
case WTAP_ENCAP_IRDA:
if (!pcap_write_irda_pseudoheader(wdh, pseudo_header, err))
return FALSE;
break;
case WTAP_ENCAP_MTP2_WITH_PHDR:
if (!pcap_write_mtp2_pseudoheader(wdh, pseudo_header, err))
return FALSE;
break;
case WTAP_ENCAP_LINUX_LAPD:
if (!pcap_write_lapd_pseudoheader(wdh, pseudo_header, err))
return FALSE;
break;
case WTAP_ENCAP_SITA:
if (!pcap_write_sita_pseudoheader(wdh, pseudo_header, err))
return FALSE;
break;
case WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR:
if (!pcap_write_bt_pseudoheader(wdh, pseudo_header, err))
return FALSE;
break;
case WTAP_ENCAP_BLUETOOTH_LINUX_MONITOR:
if (!pcap_write_bt_monitor_pseudoheader(wdh, pseudo_header, err))
return FALSE;
break;
case WTAP_ENCAP_NFC_LLCP:
if (!pcap_write_llcp_pseudoheader(wdh, pseudo_header, err))
return FALSE;
break;
case WTAP_ENCAP_PPP_WITH_PHDR:
if (!pcap_write_ppp_pseudoheader(wdh, pseudo_header, err))
return FALSE;
break;
case WTAP_ENCAP_ERF:
if (!pcap_write_erf_pseudoheader(wdh, pseudo_header, err))
return FALSE;
break;
case WTAP_ENCAP_I2C_LINUX:
if (!pcap_write_i2c_linux_pseudoheader(wdh, pseudo_header, err))
return FALSE;
break;
}
return TRUE;
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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