/* pcap-common.c * Code common to pcap and pcapng file formats * * Wiretap Library * Copyright (c) 1998 by Gilbert Ramirez * * File format support for pcapng file format * Copyright (c) 2007 by Ulf Lamping * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "config.h" #include "pcap-common.h" #include #include #include "wtap-int.h" #include "file_wrappers.h" #include "atm.h" #include "erf_record.h" #include "pcap-encap.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 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 }, /* 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 }, /* DECT_NR (DECT-2020 New Radio (NR) MAC layer) */ { 301, WTAP_ENCAP_DECT_NR }, /* * 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 array_length(pcap_to_wtap_map) 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. */ unsigned 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, unsigned packet_size, int *err, char **err_info) { uint8_t atm_phdr[NOKIAATM_LEN]; uint8_t vpi; uint16_t 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, unsigned packet_size, int *err, char **err_info) { uint8_t atm_phdr[SUNATM_LEN]; uint8_t vpi; uint16_t 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 bool pcap_write_sunatm_pseudoheader(wtap_dumper *wdh, const union wtap_pseudo_header *pseudo_header, int *err) { uint8_t 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] = (uint8_t)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, unsigned packet_size, int *err, char **err_info) { uint8_t 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 bool pcap_write_irda_pseudoheader(wtap_dumper *wdh, const union wtap_pseudo_header *pseudo_header, int *err) { uint8_t 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, unsigned packet_size, int *err, char **err_info) { uint8_t 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 bool pcap_write_mtp2_pseudoheader(wtap_dumper *wdh, const union wtap_pseudo_header *pseudo_header, int *err) { uint8_t 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, unsigned packet_size, int *err, char **err_info) { uint8_t 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 bool pcap_write_lapd_pseudoheader(wtap_dumper *wdh, const union wtap_pseudo_header *pseudo_header, int *err) { uint8_t 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, unsigned packet_size, int *err, char **err_info) { uint8_t 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 bool pcap_write_sita_pseudoheader(wtap_dumper *wdh, const union wtap_pseudo_header *pseudo_header, int *err) { uint8_t 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 { uint32_t 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, unsigned packet_size, int *err, char **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 bool pcap_write_bt_pseudoheader(wtap_dumper *wdh, const union wtap_pseudo_header *pseudo_header, int *err) { uint32_t 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 { uint16_t adapter_id; uint16_t opcode; }; static int pcap_read_bt_monitor_pseudoheader(FILE_T fh, union wtap_pseudo_header *pseudo_header, unsigned packet_size, int *err, char **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 bool 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, unsigned packet_size, int *err, char **err_info) { uint8_t 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 bool pcap_write_llcp_pseudoheader(wtap_dumper *wdh, const union wtap_pseudo_header *pseudo_header, int *err) { uint8_t 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 { uint8_t 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, unsigned packet_size, int *err, char **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 bool 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, unsigned packet_size, int *err, char **err_info) { uint8_t erf_hdr[sizeof(struct erf_phdr)]; uint8_t 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) { uint64_t 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 = ((uint32_t) (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 = array_length(pseudo_header->erf.ehdr_list); uint8_t erf_exhdr[8]; uint8_t 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 < (unsigned)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) { uint64_t 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 < (unsigned)(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 < (unsigned)(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 < (unsigned)(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 bool pcap_write_erf_pseudoheader(wtap_dumper *wdh, const union wtap_pseudo_header *pseudo_header, int *err) { uint8_t erf_hdr[sizeof(struct erf_phdr)]; uint8_t 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 = array_length(pseudo_header->erf.ehdr_list); uint8_t erf_exhdr[8]; uint8_t 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 { uint8_t bus; uint8_t flags[4]; }; static int pcap_read_i2c_linux_pseudoheader(FILE_T fh, union wtap_pseudo_header *pseudo_header, unsigned packet_size, int *err, char **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 bool 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((uint8_t *)&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 bool pcap_read_nokia_pseudoheader(FILE_T fh, union wtap_pseudo_header *pseudo_header, int *err, char **err_info) { uint8_t 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 { int32_t error_count; int32_t 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 { uint64_t id; /* urb id, to link submission and completion events */ uint8_t event_type; /* Submit ('S'), Completed ('C'), Error ('E') */ uint8_t transfer_type; /* ISO (0), Intr, Control, Bulk (3) */ uint8_t endpoint_number; /* Endpoint number (0-15) and transfer direction */ uint8_t device_address; /* 0-127 */ uint16_t bus_id; int8_t setup_flag; /* 0, if the urb setup header is meaningful */ int8_t data_flag; /* 0, if urb data is present */ int64_t ts_sec; int32_t ts_usec; int32_t status; uint32_t urb_len; /* whole len of urb this event refers to */ uint32_t 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 { uint8_t 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. */ int32_t interval; /* only for Interrupt and Isochronous events */ int32_t start_frame; /* for Isochronous */ uint32_t xfer_flags; /* copy of URB's transfer_flags */ uint32_t 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 { int32_t iso_status; uint32_t iso_off; uint32_t iso_len; uint32_t _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 { int8_t bmRequestType; uint8_t bRequest; uint16_t wValue; uint16_t wIndex; uint16_t 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((uint8_t *)fieldp); \ } #define CHECK_AND_SWAP32(fieldp) \ { \ if (!WITHIN_PACKET(usb_phdr, fieldp)) \ return; \ PBSWAP32((uint8_t *)fieldp); \ } #define CHECK_AND_SWAP64(fieldp) \ { \ if (!WITHIN_PACKET(usb_phdr, fieldp)) \ return; \ PBSWAP64((uint8_t *)fieldp); \ } /* * Offset and length of the CAN ID field in the CAN classic/CAN FD * SocketCAN header. */ #define CAN_CANFD_CAN_ID_OFFSET 0 #define CAN_CANFD_CAN_ID_LEN 4 /* * Offsets and lengths of fields in the CAN XL SocketCAN header. */ #define CANXL_PRIORITY_VCID_OFFSET 0 #define CANXL_PRIORITY_VCID_LEN 4 #define CANXL_FLAGS_OFFSET (CANXL_PRIORITY_VCID_OFFSET + CANXL_PRIORITY_VCID_LEN) #define CANXL_FLAGS_LEN 1 #define CANXL_SDU_TYPE_OFFSET (CANXL_FLAGS_OFFSET + CANXL_FLAGS_LEN) #define CANXL_SDU_TYPE_LEN 1 #define CANXL_PAYLOAD_LENGTH_OFFSET (CANXL_SDU_TYPE_OFFSET + CANXL_SDU_TYPE_LEN) #define CANXL_PAYLOAD_LENGTH_LEN 2 #define CANXL_ACCEPTANCE_FIELD_OFFSET (CANXL_PAYLOAD_LENGTH_OFFSET + CANXL_PAYLOAD_LENGTH_LEN) #define CANXL_ACCEPTANCE_FIELD_LEN 4 /* * 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 classic */ #define LINUX_SLL_P_CANFD 0x000D /* Controller Area Network flexible data rate */ #define LINUX_SLL_P_CANXL 0x000E /* Controller Area Network extended length */ static void pcap_byteswap_can_socketcan_pseudoheader(unsigned packet_size, uint16_t protocol, uint8_t *pd) { switch (protocol) { case LINUX_SLL_P_CAN: case LINUX_SLL_P_CANFD: /* * CAN classic or CAN FD; byte-swap the ID/flags field * into our host byte order. * * Make sure we have the entire field. */ if (packet_size < (CAN_CANFD_CAN_ID_OFFSET + CAN_CANFD_CAN_ID_LEN)) { /* Not enough data to have the full CAN ID */ return; } PBSWAP32(&pd[CAN_CANFD_CAN_ID_OFFSET]); break; case LINUX_SLL_P_CANXL: /* * CAN classic or CAN FD; byte-swap the priority-and-VCID * field, the payload length, ad the acceptance field * into our host byte order. */ if (packet_size < (CANXL_PRIORITY_VCID_OFFSET + CANXL_PRIORITY_VCID_LEN)) { /* Not enough data to have the full priority/VCID field */ return; } PBSWAP32(&pd[CANXL_PRIORITY_VCID_OFFSET]); if (packet_size < (CANXL_PAYLOAD_LENGTH_OFFSET + CANXL_PAYLOAD_LENGTH_LEN)) { /* Not enough data to have the full payload length field */ return; } PBSWAP16(&pd[CANXL_PAYLOAD_LENGTH_OFFSET]); if (packet_size < (CANXL_ACCEPTANCE_FIELD_OFFSET + CANXL_ACCEPTANCE_FIELD_LEN)) { /* Not enough data to have the full payload length field */ return; } PBSWAP32(&pd[CANXL_ACCEPTANCE_FIELD_OFFSET]); break; default: /* Not a CAN packet; nothing to fix */ return; } } static void pcap_byteswap_linux_sll_pseudoheader(wtap_rec *rec, uint8_t *pd) { unsigned packet_size; uint16_t protocol; /* * 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; } /* * Byte-swap the SocketCAN pseudoheader, if we have one. */ protocol = pntoh16(&pd[LINUX_SLL_PROTOCOL_OFFSET]); pcap_byteswap_can_socketcan_pseudoheader(packet_size - LINUX_SLL_LEN, protocol, pd + LINUX_SLL_LEN); } static void pcap_byteswap_linux_sll2_pseudoheader(wtap_rec *rec, uint8_t *pd) { unsigned packet_size; uint16_t protocol; /* * 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; } /* * Byte-swap the SocketCAN pseudoheader, if we have one. */ protocol = pntoh16(&pd[LINUX_SLL2_PROTOCOL_OFFSET]); pcap_byteswap_can_socketcan_pseudoheader(packet_size - LINUX_SLL2_LEN, protocol, pd + LINUX_SLL2_LEN); } static void pcap_byteswap_linux_usb_pseudoheader(wtap_rec *rec, uint8_t *pd, bool header_len_64_bytes) { unsigned packet_size; struct linux_usb_phdr *usb_phdr; struct linux_usb_isodesc *pisodesc; int32_t 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 { uint8_t nflog_family; /* address family */ uint8_t nflog_version; /* version */ uint16_t nflog_rid; /* resource ID */ }; struct nflog_tlv { uint16_t tlv_length; /* tlv length */ uint16_t tlv_type; /* tlv type */ /* value follows this */ }; static void pcap_byteswap_nflog_pseudoheader(wtap_rec *rec, uint8_t *pd) { unsigned packet_size; uint8_t *p; struct nflog_hdr *nfhdr; struct nflog_tlv *tlv; unsigned 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 -= (unsigned)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((uint8_t *)&tlv->tlv_type); PBSWAP16((uint8_t *)&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 { uint8_t length; uint8_t af; uint8_t action; uint8_t reason; char ifname[PFLOG_IFNAMSIZ]; char ruleset[PFLOG_RULESET_NAME_SIZE]; uint32_t rulenr; uint32_t subrulenr; uint32_t uid; int32_t pid; uint32_t rule_uid; int32_t rule_pid; uint8_t dir; /* More follows, depending on the header length */ }; static void pcap_byteswap_pflog_pseudoheader(wtap_rec *rec, uint8_t *pd) { unsigned 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 < (unsigned) (offsetof(struct pfloghdr, rule_pid) + sizeof pflhdr->rule_pid)) { /* Header doesn't include the UID and PID fields */ return; } PBSWAP32((uint8_t *)&pflhdr->uid); PBSWAP32((uint8_t *)&pflhdr->pid); PBSWAP32((uint8_t *)&pflhdr->rule_uid); PBSWAP32((uint8_t *)&pflhdr->rule_pid); } int pcap_process_pseudo_header(FILE_T fh, bool is_nokia, int wtap_encap, unsigned packet_size, wtap_rec *rec, int *err, char **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 (uint32_t 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 uint8_t *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(bool is_nokia, int wtap_encap, wtap_rec *rec, uint8_t *pd, bool 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; } } bool 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 = array_length(pseudo_header->erf.ehdr_list); uint8_t erf_exhdr[8]; uint8_t 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; } bool 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: */