#include "config.h"
#endif
-#ifdef WIN32
+#ifdef _WIN32
#include <pcap-stdinc.h>
-#else /* WIN32 */
+#else /* _WIN32 */
#if HAVE_INTTYPES_H
#include <inttypes.h>
#elif HAVE_STDINT_H
#include <sys/bitypes.h>
#endif
#include <sys/types.h>
-#endif /* WIN32 */
+#endif /* _WIN32 */
#include "pcap-int.h"
#include "pcap/usb.h"
+#include "pcap/nflog.h"
#include "pcap-common.h"
#define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */
#define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */
-#define LINKTYPE_GPF_F 171 /* GPF-T (ITU-T G.7041/Y.1303) */
+#define LINKTYPE_GPF_F 171 /* GPF-F (ITU-T G.7041/Y.1303) */
/*
/*
* Juniper-private data link type, as per request from
* The Link Types are used for prepending meta-information
* like interface index, interface name
* before standard Ethernet, PPP, Frelay & C-HDLC Frames
/*
* Juniper-private data link type, as per request from
* The DLT_ is used for internal communication with a
* voice Adapter Card (PIC)
*/
#define LINKTYPE_A653_ICM 185
/*
- * USB packets, beginning with a USB setup header; requested by
+ * This used to be "USB packets, beginning with a USB setup header;
+ *
+ * However, that header didn't work all that well - it left out some
+ * useful information - and was abandoned in favor of the DLT_USB_LINUX
+ * header.
+ *
+ * This is now used by FreeBSD for its BPF taps for USB; that has its
+ * own headers. So it is written, so it is done.
*/
-#define LINKTYPE_USB 186
+#define LINKTYPE_USB_FREEBSD 186
/*
* Bluetooth HCI UART transport layer (part H:4); requested by
/*
* Juniper-private data link type, as per request from
* The DLT_ is used for internal communication with a
* integrated service module (ISM).
*/
/*
* Juniper-private data link type, as per request from
* The DLT_ is used for capturing data on a secure tunnel interface.
*/
#define LINKTYPE_JUNIPER_ST 200
*/
#define LINKTYPE_IEEE802_15_4_NONASK_PHY 215
-/*
+/*
* captures from the Linux kernel /dev/input/eventN devices. This
* is used to communicate keystrokes and mouse movements from the
- * Linux kernel to display systems, such as Xorg.
+ * Linux kernel to display systems, such as Xorg.
*/
#define LINKTYPE_LINUX_EVDEV 216
/*
* Juniper-private data link type, as per request from
*/
#define LINKTYPE_JUNIPER_VS 232
#define LINKTYPE_JUNIPER_SRX_E2E 233
/*
* Juniper-private data link type, as per request from
*/
#define LINKTYPE_JUNIPER_ATM_CEMIC 238
/*
- * NetFilter LOG messages
+ * NetFilter LOG messages
* (payload of netlink NFNL_SUBSYS_ULOG/NFULNL_MSG_PACKET packets)
*
*/
#define LINKTYPE_SCTP 248
-#define LINKTYPE_MATCHING_MAX 248 /* highest value in the "matching" range */
+/*
+ * USB packets, beginning with a USBPcap header.
+ *
+ */
+#define LINKTYPE_USBPCAP 249
+
+/*
+ * Schweitzer Engineering Laboratories "RTAC" product serial-line
+ * packets.
+ *
+ */
+#define DLT_RTAC_SERIAL 250
+
+/*
+ * Bluetooth Low Energy air interface link-layer packets.
+ *
+ */
+#define LINKTYPE_BLUETOOTH_LE_LL 251
+
+/*
+ * Link-layer header type for upper-protocol layer PDU saves from wireshark.
+ *
+ * the actual contents are determined by two TAGs stored with each
+ * packet:
+ * EXP_PDU_TAG_LINKTYPE the link type (LINKTYPE_ value) of the
+ * original packet.
+ *
+ * EXP_PDU_TAG_PROTO_NAME the name of the wireshark dissector
+ * that can make sense of the data stored.
+ */
+#define LINKTYPE_WIRESHARK_UPPER_PDU 252
+
+/*
+ * Link-layer header type for the netlink protocol (nlmon devices).
+ */
+#define LINKTYPE_NETLINK 253
+
+/*
+ * Bluetooth Linux Monitor headers for the BlueZ stack.
+ */
+#define LINKTYPE_BLUETOOTH_LINUX_MONITOR 254
+
+/*
+ * Bluetooth Basic Rate/Enhanced Data Rate baseband packets, as
+ * captured by Ubertooth.
+ */
+#define LINKTYPE_BLUETOOTH_BREDR_BB 255
+
+/*
+ * Bluetooth Low Energy link layer packets, as captured by Ubertooth.
+ */
+#define LINKTYPE_BLUETOOTH_LE_LL_WITH_PHDR 256
+
+/*
+ * PROFIBUS data link layer.
+ */
+#define LINKTYPE_PROFIBUS_DL 257
+
+/*
+ * Apple's DLT_PKTAP headers.
+ *
+ * Sadly, the folks at Apple either had no clue that the DLT_USERn values
+ * are for internal use within an organization and partners only, and
+ * didn't know that the right way to get a link-layer header type is to
+ * ask tcpdump.org for one, or knew and didn't care, so they just
+ * used DLT_USER2, which causes problems for everything except for
+ * their version of tcpdump.
+ *
+ * So I'll just give them one; hopefully this will show up in a
+ * libpcap release in time for them to get this into 10.10 Big Sur
+ * or whatever Mavericks' successor is called. LINKTYPE_PKTAP
+ * will be 258 *even on OS X*; that is *intentional*, so that
+ * PKTAP files look the same on *all* OSes (different OSes can have
+ * different numerical values for a given DLT_, but *MUST NOT* have
+ * different values for what goes in a file, as files can be moved
+ * between OSes!).
+ */
+#define LINKTYPE_PKTAP 258
+
+/*
+ * Ethernet packets preceded by a header giving the last 6 octets
+ * of the preamble specified by 802.3-2012 Clause 65, section
+ * 65.1.3.2 "Transmit".
+ */
+#define LINKTYPE_EPON 259
+
+/*
+ * IPMI trace packets, as specified by Table 3-20 "Trace Data Block Format"
+ * in the PICMG HPM.2 specification.
+ */
+#define LINKTYPE_IPMI_HPM_2 260
+
+/*
+ */
+#define LINKTYPE_ZWAVE_R1_R2 261
+#define LINKTYPE_ZWAVE_R3 262
+
+/*
+ * Digital Lighting Management room bus serial protocol captures.
+ */
+#define LINKTYPE_WATTSTOPPER_DLM 263
+
+/*
+ * ISO 14443 contactless smart card messages.
+ */
+#define LINKTYPE_ISO_14443 264
+
+#define LINKTYPE_MATCHING_MAX 264 /* highest value in the "matching" range */
static struct linktype_map {
int dlt;
int i;
/*
- * Map DLT_PFSYNC, whatever it might be, to LINKTYPE_PFSYNC.
+ * DLTs that, on some platforms, have values in the matching range
+ * but that *don't* have the same value as the corresponding
+ * LINKTYPE because, for some reason, not all OSes have the
+ * same value for that DLT (note that the DLT's value might be
+ * outside the matching range on some of those OSes).
*/
if (dlt == DLT_PFSYNC)
return (LINKTYPE_PFSYNC);
+ if (dlt == DLT_PKTAP)
+ return (LINKTYPE_PKTAP);
/*
- * Map the values in the matching range.
+ * For all other values in the matching range, the DLT
+ * value is the same as the LINKTYPE value.
*/
if (dlt >= DLT_MATCHING_MIN && dlt <= DLT_MATCHING_MAX)
return (dlt);
}
/*
- * If we don't have a mapping for this DLT_ code, return an
+ * If we don't have a mapping for this DLT, return an
* error; that means that this is a value with no corresponding
- * LINKTYPE_ code, and we need to assign one.
+ * LINKTYPE, and we need to assign one.
*/
return (-1);
}
int i;
/*
- * Map LINKTYPE_PFSYNC to DLT_PFSYNC, whatever it might be.
- * LINKTYPE_PFSYNC is in the matching range, to make sure
- * it's as safe from reuse as we can arrange, so we do
- * this test first.
+ * LINKTYPEs in the matching range that *don't*
+ * have the same value as the corresponding DLTs
+ * because, for some reason, not all OSes have the
+ * same value for that DLT.
*/
if (linktype == LINKTYPE_PFSYNC)
return (DLT_PFSYNC);
+ if (linktype == LINKTYPE_PKTAP)
+ return (DLT_PKTAP);
/*
- * Map the values in the matching range.
+ * For all other values in the matching range, the LINKTYPE
+ * value is the same as the DLT value.
*/
if (linktype >= LINKTYPE_MATCHING_MIN &&
linktype <= LINKTYPE_MATCHING_MAX)
}
/*
- * If we don't have an entry for this link type, return
- * the link type value; it may be a DLT_ value from an
- * older version of libpcap.
+ * If we don't have an entry for this LINKTYPE, return
+ * the link type value; it may be a DLT from an older
+ * version of libpcap.
*/
return linktype;
}
* memory-mapped buffer shared by the kernel).
*
* When reading a DLT_USB_LINUX or DLT_USB_LINUX_MMAPPED capture file,
- * we need to convert it from the capturing host's byte order to
- * the reading host's byte order.
+ * we need to convert it from the byte order of the host that wrote
+ * the file to this host's byte order.
*/
-void
+static void
swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf,
int header_len_64_bytes)
{
pcap_usb_header_mmapped *uhdr = (pcap_usb_header_mmapped *)buf;
bpf_u_int32 offset = 0;
- usb_isodesc *pisodesc;
- int32_t numdesc, i;
/*
* "offset" is the offset *past* the field we're swapping;
*/
/*
- * The URB id is a totally opaque value; do we really need to
+ * The URB id is a totally opaque value; do we really need to
* convert it to the reading host's byte order???
*/
offset += 8; /* skip past id */
} else
offset += 8; /* skip USB setup header */
+ /*
+ * With the old header, there are no isochronous descriptors
+ * after the header.
+ *
+ * With the new header, the actual number of descriptors in
+ * the header is not s.iso.numdesc, it's ndesc - only the
+ * first N descriptors, for some value of N, are put into
+ * the header, and ndesc is set to the actual number copied.
+ * In addition, if s.iso.numdesc is negative, no descriptors
+ * are captured, and ndesc is set to 0.
+ */
if (header_len_64_bytes) {
/*
* This is either the "version 1" header, with
if (hdr->caplen < offset)
return;
uhdr->ndesc = SWAPLONG(uhdr->ndesc);
- }
- if (uhdr->transfer_type == URB_ISOCHRONOUS) {
- /* swap the values in struct linux_usb_isodesc */
- pisodesc = (usb_isodesc *)(void *)(buf+offset);
- numdesc = uhdr->s.iso.numdesc;
- for (i = 0; i < numdesc; i++) {
- offset += 4; /* skip past status */
- if (hdr->caplen < offset)
- return;
- pisodesc->status = SWAPLONG(pisodesc->status);
-
- offset += 4; /* skip past offset */
- if (hdr->caplen < offset)
- return;
- pisodesc->offset = SWAPLONG(pisodesc->offset);
-
- offset += 4; /* skip past len */
- if (hdr->caplen < offset)
- return;
- pisodesc->len = SWAPLONG(pisodesc->len);
-
- offset += 4; /* skip past padding */
-
- pisodesc++;
+ if (uhdr->transfer_type == URB_ISOCHRONOUS) {
+ /* swap the values in struct linux_usb_isodesc */
+ usb_isodesc *pisodesc;
+ u_int32_t i;
+
+ pisodesc = (usb_isodesc *)(void *)(buf+offset);
+ for (i = 0; i < uhdr->ndesc; i++) {
+ offset += 4; /* skip past status */
+ if (hdr->caplen < offset)
+ return;
+ pisodesc->status = SWAPLONG(pisodesc->status);
+
+ offset += 4; /* skip past offset */
+ if (hdr->caplen < offset)
+ return;
+ pisodesc->offset = SWAPLONG(pisodesc->offset);
+
+ offset += 4; /* skip past len */
+ if (hdr->caplen < offset)
+ return;
+ pisodesc->len = SWAPLONG(pisodesc->len);
+
+ offset += 4; /* skip past padding */
+
+ pisodesc++;
+ }
}
}
}
+
+/*
+ * The DLT_NFLOG "packets" have a mixture of big-endian and host-byte-order
+ * data. They begin with a fixed-length header with big-endian fields,
+ * followed by a set of TLVs, where the type and length are in host
+ * byte order but the values are either big-endian or are a raw byte
+ * sequence that's the same regardless of the host's byte order.
+ *
+ * When reading a DLT_NFLOG capture file, we need to convert the type
+ * and length values from the byte order of the host that wrote the
+ * file to the byte order of this host.
+ */
+static void
+swap_nflog_header(const struct pcap_pkthdr *hdr, u_char *buf)
+{
+ u_char *p = buf;
+ nflog_hdr_t *nfhdr = (nflog_hdr_t *)buf;
+ nflog_tlv_t *tlv;
+ u_int caplen = hdr->caplen;
+ u_int length = hdr->len;
+ u_int16_t size;
+
+ if (caplen < (int) sizeof(nflog_hdr_t) || length < (int) sizeof(nflog_hdr_t)) {
+ /* Not enough data to have any TLVs. */
+ return;
+ }
+
+ if (nfhdr->nflog_version != 0) {
+ /* Unknown NFLOG version */
+ return;
+ }
+
+ length -= sizeof(nflog_hdr_t);
+ caplen -= sizeof(nflog_hdr_t);
+ p += sizeof(nflog_hdr_t);
+
+ while (caplen >= sizeof(nflog_tlv_t)) {
+ tlv = (nflog_tlv_t *) p;
+
+ /* Swap the type and length. */
+ tlv->tlv_type = SWAPSHORT(tlv->tlv_type);
+ tlv->tlv_length = SWAPSHORT(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(nflog_tlv_t)) {
+ /* Yes. Give up now. */
+ return;
+ }
+
+ /* Do we have enough data for the full TLV? */
+ if (caplen < size || length < size) {
+ /* No. */
+ return;
+ }
+
+ /* Skip over the TLV. */
+ length -= size;
+ caplen -= size;
+ p += size;
+ }
+}
+
+void
+swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr, u_char *data)
+{
+ /*
+ * Convert pseudo-headers from the byte order of
+ * the host on which the file was saved to our
+ * byte order, as necessary.
+ */
+ switch (linktype) {
+
+ case DLT_USB_LINUX:
+ swap_linux_usb_header(hdr, data, 0);
+ break;
+
+ case DLT_USB_LINUX_MMAPPED:
+ swap_linux_usb_header(hdr, data, 1);
+ break;
+
+ case DLT_NFLOG:
+ swap_nflog_header(hdr, data);
+ break;
+ }
+}
projects / libpcap / blobdiff