Byte-swap the extra fields in the "version 1" USB monitor header.
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f9c2f9a852
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ecd955e0df
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@ -1123,9 +1123,10 @@ linktype_to_dlt(int linktype)
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* the reading host's byte order.
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*/
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void
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swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf)
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swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf,
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int header_len_64_bytes)
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{
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pcap_usb_header *uhdr = (pcap_usb_header *)buf;
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pcap_usb_header_mmapped *uhdr = (pcap_usb_header_mmapped *)buf;
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/*
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* The URB id is a totally opaque value; do we really need to
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@ -1152,4 +1153,27 @@ swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf)
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if (hdr->caplen < 40)
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return;
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uhdr->data_len = SWAPLONG(uhdr->data_len);
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if (header_len_64_bytes) {
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/*
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* This is either the "version 1" header, with
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* 16 bytes of additional fields at the end, or
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* a "version 0" header from a memory-mapped
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* capture, with 16 bytes of zeroed-out padding
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* at the end. Byte swap them as if this were
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* a "version 1" header.
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*/
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if (hdr->caplen < 52)
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return;
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uhdr->interval = SWAPLONG(uhdr->interval);
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if (hdr->caplen < 56)
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return;
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uhdr->start_frame = SWAPLONG(uhdr->start_frame);
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if (hdr->caplen < 60)
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return;
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uhdr->xfer_flags = SWAPLONG(uhdr->xfer_flags);
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if (hdr->caplen < 64)
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return;
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uhdr->ndesc = SWAPLONG(uhdr->ndesc);
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}
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}
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@ -21,4 +21,5 @@ extern int dlt_to_linktype(int dlt);
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extern int linktype_to_dlt(int linktype);
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extern void swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf);
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extern void swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf,
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int header_len_64_bytes);
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41
pcap/usb.h
41
pcap/usb.h
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@ -54,7 +54,7 @@
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/*
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* USB setup header as defined in USB specification.
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* Appears at the front of each packet in DLT_USB captures.
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* Appears at the front of each Control S-type packet in DLT_USB captures.
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*/
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typedef struct _usb_setup {
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u_int8_t bmRequestType;
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@ -64,6 +64,13 @@ typedef struct _usb_setup {
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u_int16_t wLength;
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} pcap_usb_setup;
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/*
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* Information from the URB for Isochronous transfers.
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*/
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typedef struct _iso_rec {
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int32_t error_count;
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int32_t numdesc;
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} iso_rec;
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/*
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* Header prepended by linux kernel to each event.
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@ -87,8 +94,11 @@ typedef struct _usb_header {
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} pcap_usb_header;
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/*
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* Header prepended by linux kernel to each event, plus padding in the
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* internal buffer.
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* Header prepended by linux kernel to each event for the 2.6.31
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* and later kernels; for the 2.6.21 through 2.6.30 kernels, the
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* "iso_rec" information, and the fields starting with "interval"
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* are zeroed-out padding fields.
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*
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* Appears at the front of each packet in DLT_USB_LINUX_MMAPPED captures.
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*/
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typedef struct _usb_header_mmapped {
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@ -105,8 +115,29 @@ typedef struct _usb_header_mmapped {
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int32_t status;
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u_int32_t urb_len;
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u_int32_t data_len; /* amount of urb data really present in this event*/
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pcap_usb_setup setup;
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u_int8_t padding[16];
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union {
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pcap_usb_setup setup;
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iso_rec iso;
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} s;
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int32_t interval; /* for Interrupt and Isochronous events */
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int32_t start_frame; /* for Isochronous events */
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u_int32_t xfer_flags; /* copy of URB's transfer flags */
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u_int32_t ndesc; /* number of isochronous descriptors */
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} pcap_usb_header_mmapped;
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/*
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* Isochronous descriptors; for isochronous transfers there might be
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* one or more of these at the beginning of the packet data. The
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* number of descriptors is given by the "ndesc" field in the header;
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* as indicated, in older kernels that don't put the descriptors at
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* the beginning of the packet, that field is zeroed out, so that field
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* can be trusted even in captures from older kernels.
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*/
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typedef struct _usb_isodesc {
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int32_t status;
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u_int32_t offset;
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u_int32_t len;
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u_int8_t pad[4];
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} usb_isodesc;
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#endif
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@ -1100,8 +1100,11 @@ found:
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switch (p->linktype) {
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case DLT_USB_LINUX:
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swap_linux_usb_header(hdr, *data, 0);
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break;
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case DLT_USB_LINUX_MMAPPED:
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swap_linux_usb_header(hdr, *data);
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swap_linux_usb_header(hdr, *data, 1);
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break;
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}
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}
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@ -422,8 +422,11 @@ pcap_next_packet(pcap_t *p, struct pcap_pkthdr *hdr, u_char **data)
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switch (p->linktype) {
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case DLT_USB_LINUX:
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swap_linux_usb_header(hdr, *data, 0);
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break;
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case DLT_USB_LINUX_MMAPPED:
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swap_linux_usb_header(hdr, *data);
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swap_linux_usb_header(hdr, *data, 1);
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break;
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}
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}
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