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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
| commit | e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc (patch) | |
| tree | 68cb5ef9081156392f1dd62a00c6ccc1451b93df /wiretap/pcap-common.c | |
| parent | Initial commit. (diff) | |
| download | wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.tar.xz wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.zip | |
Adding upstream version 4.2.2.upstream/4.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'wiretap/pcap-common.c')
| -rw-r--r-- | wiretap/pcap-common.c | 2852 |
1 files changed, 2852 insertions, 0 deletions
diff --git a/wiretap/pcap-common.c b/wiretap/pcap-common.c new file mode 100644 index 00000000..3a607940 --- /dev/null +++ b/wiretap/pcap-common.c @@ -0,0 +1,2852 @@ +/* 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 "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 }, + + /* nRF Sniffer for Bluetooth LE */ + { 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 }, + + /* ATSC Link-Layer Protocol (A/330) packets */ + { 289, WTAP_ENCAP_ATSC_ALP }, + + /* Event Tracing for Windows records */ + { 290, WTAP_ENCAP_ETW }, + + /* Serial NCP (Network Co-Processor) protocol for Zigbee stack ZBOSS */ + { 292, WTAP_ENCAP_ZBNCP }, + + /* USB 2.0/1.1/1.0 packets captured on Low/Full/High speed link */ + { 293, WTAP_ENCAP_USB_2_0_LOW_SPEED }, + { 294, WTAP_ENCAP_USB_2_0_FULL_SPEED }, + { 295, WTAP_ENCAP_USB_2_0_HIGH_SPEED }, + + /* Auerswald log file captured from any supported Auerswald device */ + { 296, WTAP_ENCAP_AUERSWALD_LOG }, + + /* Silicon Labs debug channel */ + { 298, WTAP_ENCAP_SILABS_DEBUG_CHANNEL }, + + /* Ultra-wideband (UWB) controller interface protocol (UCI) */ + { 299, WTAP_ENCAP_FIRA_UCI }, + + /* MDB (Multi-Drop Bus) */ + { 300, WTAP_ENCAP_MDB }, + + /* + * 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: + case WTAP_ENCAP_USB_LINUX: + case WTAP_ENCAP_USB_LINUX_MMAPPED: + case WTAP_ENCAP_USB_DARWIN: + case WTAP_ENCAP_USB_FREEBSD: + 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 = ws_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 = ws_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; + 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 = ws_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; + 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 = ws_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; + 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 = ws_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; + 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 = ws_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; + 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 = ws_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; + 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 = ws_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; + 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 = ws_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; + 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 = ws_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; + 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 = ws_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 = (time_t) (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; + } + + /* + * This time stamp came from the ERF header, not from the + * pcap packet header or pcapng block header, so its + * precision is that of ERF time stamps, not the pcap + * file's time stamp or the pcapng interface's time + * stamp. + */ + rec->tsprec = WTAP_TSPREC_NSEC; + } + + /* + * 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 = ws_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 = ws_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 = ws_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 = ws_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 = ws_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 = ws_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 = ws_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 = ws_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; + + /* + * 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; + 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; + 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; + 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; + 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 = ws_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; + 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 */ +}; + +/* + * event_type values + */ +#define URB_SUBMIT 'S' +#define URB_COMPLETE 'C' +#define URB_ERROR 'E' + +/* + * URB transfer_type values + */ +#define URB_ISOCHRONOUS 0x0 +#define URB_INTERRUPT 0x1 +#define URB_CONTROL 0x2 +#define URB_BULK 0x3 +#define URB_UNKNOWN 0xFF + +#define URB_TRANSFER_IN 0x80 /* to host */ + +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; +}; + +/* + * CAN fake link-layer headers in Linux cooked packets. + */ +#define LINUX_SLL_PROTOCOL_OFFSET 14 /* protocol */ +#define LINUX_SLL_LEN 16 /* length of the header */ + +#define LINUX_SLL2_PROTOCOL_OFFSET 0 /* protocol */ +#define LINUX_SLL2_LEN 20 /* 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_sll2_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_SLL2_LEN) { + /* Not enough data to have the protocol */ + return; + } + + protocol = pntoh16(&pd[LINUX_SLL2_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_SLL2_LEN); + + if (packet_size < LINUX_SLL2_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; + } +} + +/* + * pflog headers, at least as they exist now. + */ +#define PFLOG_IFNAMSIZ 16 +#define PFLOG_RULESET_NAME_SIZE 16 + +struct pfloghdr { + guint8 length; + guint8 af; + guint8 action; + guint8 reason; + char ifname[PFLOG_IFNAMSIZ]; + char ruleset[PFLOG_RULESET_NAME_SIZE]; + guint32 rulenr; + guint32 subrulenr; + guint32 uid; + gint32 pid; + guint32 rule_uid; + gint32 rule_pid; + guint8 dir; + /* More follows, depending on the header length */ +}; + +static void +pcap_byteswap_pflog_pseudoheader(wtap_rec *rec, guint8 *pd) +{ + guint packet_size; + struct pfloghdr *pflhdr; + + /* + * 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 pfloghdr)) { + /* Not enough data to have the UID and PID fields */ + return; + } + + pflhdr = (struct pfloghdr *)pd; + if (pflhdr->length < (guint) (offsetof(struct pfloghdr, rule_pid) + sizeof pflhdr->rule_pid)) { + /* Header doesn't include the UID and PID fields */ + return; + } + PBSWAP32((guint8 *)&pflhdr->uid); + PBSWAP32((guint8 *)&pflhdr->pid); + PBSWAP32((guint8 *)&pflhdr->rule_uid); + PBSWAP32((guint8 *)&pflhdr->rule_pid); +} + +int +pcap_process_pseudo_header(FILE_T fh, gboolean is_nokia, 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 (is_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 (is_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; +} + +/* + * Compute, from the data provided by the Linux USB memory-mapped capture + * mechanism, the amount of packet data that would have been provided + * had the capture mechanism not chopped off any data at the end, if, in + * fact, it did so. + * + * Set the "unsliced length" field of the packet header to that value. + */ +static void +fix_linux_usb_mmapped_length(wtap_rec *rec, const u_char *bp) +{ + const struct linux_usb_phdr *hdr; + u_int bytes_left; + + /* + * All callers of this routine must ensure that pkth->caplen is + * >= sizeof (struct linux_usb_phdr). + */ + bytes_left = rec->rec_header.packet_header.caplen; + bytes_left -= sizeof (struct linux_usb_phdr); + + hdr = (const struct linux_usb_phdr *) bp; + if (!hdr->data_flag && hdr->transfer_type == URB_ISOCHRONOUS && + hdr->event_type == URB_COMPLETE && + (hdr->endpoint_number & URB_TRANSFER_IN) && + rec->rec_header.packet_header.len == sizeof(struct linux_usb_phdr) + + (hdr->ndesc * sizeof (struct linux_usb_isodesc)) + hdr->urb_len) { + struct linux_usb_isodesc *descs; + u_int pre_truncation_data_len, pre_truncation_len; + + descs = (struct linux_usb_isodesc *) (bp + sizeof(struct linux_usb_phdr)); + + /* + * We have data (yes, data_flag is 0 if we *do* have data), + * and this is a "this is complete" incoming isochronous + * transfer event, and the length was calculated based + * on the URB length. + * + * That's not correct, because the data isn't contiguous, + * and the isochronous descriptos show how it's scattered. + * + * Find the end of the last chunk of data in the buffer + * referred to by the isochronous descriptors; that indicates + * how far into the buffer the data would have gone. + * + * Make sure we don't run past the end of the captured data + * while processing the isochronous descriptors. + */ + pre_truncation_data_len = 0; + for (guint32 desc = 0; + desc < hdr->ndesc && bytes_left >= sizeof (struct linux_usb_isodesc); + desc++, bytes_left -= sizeof (struct linux_usb_isodesc)) { + u_int desc_end; + + if (descs[desc].iso_len != 0) { + desc_end = descs[desc].iso_off + descs[desc].iso_len; + if (desc_end > pre_truncation_data_len) + pre_truncation_data_len = desc_end; + } + } + + /* + * Now calculate the total length based on that data + * length. + */ + pre_truncation_len = sizeof(struct linux_usb_phdr) + + (hdr->ndesc * sizeof (struct linux_usb_isodesc)) + + pre_truncation_data_len; + + /* + * If that's greater than or equal to the captured length, + * use that as the length. + */ + if (pre_truncation_len >= rec->rec_header.packet_header.caplen) + rec->rec_header.packet_header.len = pre_truncation_len; + + /* + * If the captured length is greater than the length, + * use the captured length. + * + * For completion events for incoming isochronous transfers, + * it's based on data_len, which is calculated the same way + * we calculated pre_truncation_data_len above, except that + * it has access to all the isochronous descriptors, not + * just the ones that the kernel were able to provide us or, + * for a capture file, that weren't sliced off by a snapshot + * length. + * + * However, it might have been reduced by the USB capture + * mechanism arbitrarily limiting the amount of data it + * provides to userland, or by the libpcap capture code + * limiting it to being no more than the snapshot, so + * we don't want to just use it all the time; we only + * do so to try to get a better estimate of the actual + * length - and to make sure the on-the-network length + * is always >= the captured length. + */ + if (rec->rec_header.packet_header.caplen > rec->rec_header.packet_header.len) + rec->rec_header.packet_header.len = rec->rec_header.packet_header.caplen; + } +} + +static void +pcap_fixup_len(wtap_rec *rec, const guint8 *pd) +{ + struct linux_usb_phdr *usb_phdr; + + /* + * 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; + + if (rec->rec_header.packet_header.caplen >= + sizeof (struct linux_usb_phdr)) { + /* + * In older versions of libpcap, in memory-mapped captures, + * the "on-the-bus length" for completion events for + * incoming isochronous transfers was miscalculated; it + * needed to be calculated based on the* offsets and lengths + * in the descriptors, not on the raw URB length, but it + * wasn't. + * + * If this packet contains transferred data (yes, data_flag + * is 0 if we *do* have data), and the total on-the-network + * length is equal to the value calculated from the raw URB + * length, then it might be one of those transfers. + * + * We only do this if we have the full USB pseudo-header. + */ + if (!usb_phdr->data_flag && + rec->rec_header.packet_header.len == sizeof (struct linux_usb_phdr) + + (usb_phdr->ndesc * sizeof (struct linux_usb_isodesc)) + usb_phdr->urb_len) { + /* + * It might need fixing; fix it if it's a completion + * event for an incoming isochronous transfer. + */ + fix_linux_usb_mmapped_length(rec, pd); + } + } +} + +void +pcap_read_post_process(gboolean is_nokia, int wtap_encap, + wtap_rec *rec, guint8 *pd, gboolean bytes_swapped, int fcs_len) +{ + switch (wtap_encap) { + + case WTAP_ENCAP_ATM_PDUS: + if (is_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: + /* + * The FCS length is supposed to be in bits. + * If it's < 8, assume it's in bytes; otherwise, + * convert it to bytes. + */ + if (fcs_len < 8) + rec->rec_header.packet_header.pseudo_header.eth.fcs_len = fcs_len; + else + rec->rec_header.packet_header.pseudo_header.eth.fcs_len = fcs_len/8; + break; + + case WTAP_ENCAP_SLL: + if (bytes_swapped) + pcap_byteswap_linux_sll_pseudoheader(rec, pd); + break; + + case WTAP_ENCAP_SLL2: + if (bytes_swapped) + pcap_byteswap_linux_sll2_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); + + /* + * Fix up the on-the-network length if necessary. + */ + pcap_fixup_len(rec, pd); + 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; + + case WTAP_ENCAP_PFLOG: + if (bytes_swapped) + pcap_byteswap_pflog_pseudoheader(rec, pd); + 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: + */ |