USB: usbmon: Add binary API v1
This patch adds an extension to the binary API so it reaches parity with existing text API (so-called "1u"). The extension delivers additional data, such as ISO descriptors and the interrupt interval. Signed-Off-By: Pete Zaitcev <zaitcev@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Pete Zaitcev
Greg Kroah-Hartman
parent
1ded7ea47b
commit
471c604daf
2 changed files with 136 additions and 33 deletions
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@ -229,16 +229,26 @@ struct usbmon_packet {
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int status; /* 28: */
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unsigned int length; /* 32: Length of data (submitted or actual) */
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unsigned int len_cap; /* 36: Delivered length */
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unsigned char setup[8]; /* 40: Only for Control 'S' */
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}; /* 48 bytes total */
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union { /* 40: */
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unsigned char setup[SETUP_LEN]; /* Only for Control S-type */
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struct iso_rec { /* Only for ISO */
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int error_count;
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int numdesc;
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} iso;
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} s;
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int interval; /* 48: Only for Interrupt and ISO */
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int start_frame; /* 52: For ISO */
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unsigned int xfer_flags; /* 56: copy of URB's transfer_flags */
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unsigned int ndesc; /* 60: Actual number of ISO descriptors */
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}; /* 64 total length */
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These events can be received from a character device by reading with read(2),
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with an ioctl(2), or by accessing the buffer with mmap.
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with an ioctl(2), or by accessing the buffer with mmap. However, read(2)
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only returns first 48 bytes for compatibility reasons.
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The character device is usually called /dev/usbmonN, where N is the USB bus
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number. Number zero (/dev/usbmon0) is special and means "all buses".
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However, this feature is not implemented yet. Note that specific naming
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policy is set by your Linux distribution.
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Note that specific naming policy is set by your Linux distribution.
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If you create /dev/usbmon0 by hand, make sure that it is owned by root
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and has mode 0600. Otherwise, unpriviledged users will be able to snoop
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@ -279,9 +289,10 @@ size is out of [unspecified] bounds for this kernel, the call fails with
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This call returns the current size of the buffer in bytes.
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MON_IOCX_GET, defined as _IOW(MON_IOC_MAGIC, 6, struct mon_get_arg)
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MON_IOCX_GETX, defined as _IOW(MON_IOC_MAGIC, 10, struct mon_get_arg)
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This call waits for events to arrive if none were in the kernel buffer,
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then returns the first event. Its argument is a pointer to the following
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These calls wait for events to arrive if none were in the kernel buffer,
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then return the first event. The argument is a pointer to the following
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structure:
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struct mon_get_arg {
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@ -294,6 +305,8 @@ Before the call, hdr, data, and alloc should be filled. Upon return, the area
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pointed by hdr contains the next event structure, and the data buffer contains
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the data, if any. The event is removed from the kernel buffer.
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The MON_IOCX_GET copies 48 bytes, MON_IOCX_GETX copies 64 bytes.
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MON_IOCX_MFETCH, defined as _IOWR(MON_IOC_MAGIC, 7, struct mon_mfetch_arg)
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This ioctl is primarily used when the application accesses the buffer
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@ -37,10 +37,13 @@
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#define MON_IOCX_GET _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get)
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#define MON_IOCX_MFETCH _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch)
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#define MON_IOCH_MFLUSH _IO(MON_IOC_MAGIC, 8)
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/* #9 was MON_IOCT_SETAPI */
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#define MON_IOCX_GETX _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get)
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#ifdef CONFIG_COMPAT
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#define MON_IOCX_GET32 _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get32)
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#define MON_IOCX_MFETCH32 _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch32)
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#define MON_IOCX_GETX32 _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get32)
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#endif
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/*
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@ -92,7 +95,29 @@ struct mon_bin_hdr {
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int status;
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unsigned int len_urb; /* Length of data (submitted or actual) */
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unsigned int len_cap; /* Delivered length */
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unsigned char setup[SETUP_LEN]; /* Only for Control S-type */
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union {
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unsigned char setup[SETUP_LEN]; /* Only for Control S-type */
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struct iso_rec {
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int error_count;
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int numdesc;
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} iso;
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} s;
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int interval;
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int start_frame;
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unsigned int xfer_flags;
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unsigned int ndesc; /* Actual number of ISO descriptors */
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};
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/*
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* ISO vector, packed into the head of data stream.
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* This has to take 16 bytes to make sure that the end of buffer
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* wrap is not happening in the middle of a descriptor.
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*/
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struct mon_bin_isodesc {
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int iso_status;
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unsigned int iso_off;
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unsigned int iso_len;
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u32 _pad;
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};
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/* per file statistic */
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@ -102,7 +127,7 @@ struct mon_bin_stats {
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};
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struct mon_bin_get {
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struct mon_bin_hdr __user *hdr; /* Only 48 bytes, not 64. */
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struct mon_bin_hdr __user *hdr; /* Can be 48 bytes or 64. */
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void __user *data;
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size_t alloc; /* Length of data (can be zero) */
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};
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@ -131,6 +156,11 @@ struct mon_bin_mfetch32 {
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#define PKT_ALIGN 64
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#define PKT_SIZE 64
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#define PKT_SZ_API0 48 /* API 0 (2.6.20) size */
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#define PKT_SZ_API1 64 /* API 1 size: extra fields */
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#define ISODESC_MAX 128 /* Same number as usbfs allows, 2048 bytes. */
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/* max number of USB bus supported */
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#define MON_BIN_MAX_MINOR 128
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@ -360,12 +390,8 @@ static inline char mon_bin_get_setup(unsigned char *setupb,
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const struct urb *urb, char ev_type)
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{
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if (!usb_endpoint_xfer_control(&urb->ep->desc) || ev_type != 'S')
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return '-';
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if (urb->setup_packet == NULL)
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return 'Z';
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memcpy(setupb, urb->setup_packet, SETUP_LEN);
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return 0;
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}
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@ -387,6 +413,26 @@ static char mon_bin_get_data(const struct mon_reader_bin *rp,
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return 0;
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}
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static void mon_bin_get_isodesc(const struct mon_reader_bin *rp,
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unsigned int offset, struct urb *urb, char ev_type, unsigned int ndesc)
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{
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struct mon_bin_isodesc *dp;
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struct usb_iso_packet_descriptor *fp;
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fp = urb->iso_frame_desc;
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while (ndesc-- != 0) {
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dp = (struct mon_bin_isodesc *)
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(rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE);
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dp->iso_status = fp->status;
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dp->iso_off = fp->offset;
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dp->iso_len = (ev_type == 'S') ? fp->length : fp->actual_length;
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dp->_pad = 0;
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if ((offset += sizeof(struct mon_bin_isodesc)) >= rp->b_size)
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offset = 0;
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fp++;
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}
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}
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static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb,
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char ev_type, int status)
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{
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@ -396,6 +442,7 @@ static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb,
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unsigned int urb_length;
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unsigned int offset;
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unsigned int length;
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unsigned int ndesc, lendesc;
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unsigned char dir;
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struct mon_bin_hdr *ep;
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char data_tag = 0;
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@ -407,6 +454,19 @@ static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb,
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/*
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* Find the maximum allowable length, then allocate space.
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*/
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if (usb_endpoint_xfer_isoc(epd)) {
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if (urb->number_of_packets < 0) {
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ndesc = 0;
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} else if (urb->number_of_packets >= ISODESC_MAX) {
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ndesc = ISODESC_MAX;
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} else {
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ndesc = urb->number_of_packets;
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}
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} else {
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ndesc = 0;
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}
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lendesc = ndesc*sizeof(struct mon_bin_isodesc);
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urb_length = (ev_type == 'S') ?
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urb->transfer_buffer_length : urb->actual_length;
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length = urb_length;
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@ -429,10 +489,12 @@ static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb,
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dir = 0;
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}
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if (rp->mmap_active)
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offset = mon_buff_area_alloc_contiguous(rp, length + PKT_SIZE);
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else
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offset = mon_buff_area_alloc(rp, length + PKT_SIZE);
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if (rp->mmap_active) {
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offset = mon_buff_area_alloc_contiguous(rp,
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length + PKT_SIZE + lendesc);
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} else {
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offset = mon_buff_area_alloc(rp, length + PKT_SIZE + lendesc);
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}
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if (offset == ~0) {
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rp->cnt_lost++;
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spin_unlock_irqrestore(&rp->b_lock, flags);
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@ -456,9 +518,31 @@ static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb,
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ep->ts_usec = ts.tv_usec;
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ep->status = status;
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ep->len_urb = urb_length;
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ep->len_cap = length;
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ep->len_cap = length + lendesc;
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ep->xfer_flags = urb->transfer_flags;
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if (usb_endpoint_xfer_int(epd)) {
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ep->interval = urb->interval;
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} else if (usb_endpoint_xfer_isoc(epd)) {
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ep->interval = urb->interval;
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ep->start_frame = urb->start_frame;
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ep->s.iso.error_count = urb->error_count;
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ep->s.iso.numdesc = urb->number_of_packets;
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}
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if (usb_endpoint_xfer_control(epd) && ev_type == 'S') {
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ep->flag_setup = mon_bin_get_setup(ep->s.setup, urb, ev_type);
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} else {
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ep->flag_setup = '-';
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}
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if (ndesc != 0) {
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ep->ndesc = ndesc;
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mon_bin_get_isodesc(rp, offset, urb, ev_type, ndesc);
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if ((offset += lendesc) >= rp->b_size)
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offset -= rp->b_size;
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}
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ep->flag_setup = mon_bin_get_setup(ep->setup, urb, ev_type);
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if (length != 0) {
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ep->flag_data = mon_bin_get_data(rp, offset, urb, length);
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if (ep->flag_data != 0) { /* Yes, it's 0x00, not '0' */
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@ -592,7 +676,8 @@ static int mon_bin_open(struct inode *inode, struct file *file)
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* Returns zero or error.
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*/
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static int mon_bin_get_event(struct file *file, struct mon_reader_bin *rp,
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struct mon_bin_hdr __user *hdr, void __user *data, unsigned int nbytes)
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struct mon_bin_hdr __user *hdr, unsigned int hdrbytes,
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void __user *data, unsigned int nbytes)
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{
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unsigned long flags;
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struct mon_bin_hdr *ep;
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@ -609,7 +694,7 @@ static int mon_bin_get_event(struct file *file, struct mon_reader_bin *rp,
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ep = MON_OFF2HDR(rp, rp->b_out);
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if (copy_to_user(hdr, ep, sizeof(struct mon_bin_hdr))) {
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if (copy_to_user(hdr, ep, hdrbytes)) {
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mutex_unlock(&rp->fetch_lock);
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return -EFAULT;
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}
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@ -657,6 +742,7 @@ static ssize_t mon_bin_read(struct file *file, char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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struct mon_reader_bin *rp = file->private_data;
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unsigned int hdrbytes = PKT_SZ_API0;
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unsigned long flags;
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struct mon_bin_hdr *ep;
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unsigned int offset;
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@ -674,8 +760,8 @@ static ssize_t mon_bin_read(struct file *file, char __user *buf,
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ep = MON_OFF2HDR(rp, rp->b_out);
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if (rp->b_read < sizeof(struct mon_bin_hdr)) {
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step_len = min(nbytes, sizeof(struct mon_bin_hdr) - rp->b_read);
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if (rp->b_read < hdrbytes) {
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step_len = min(nbytes, (size_t)(hdrbytes - rp->b_read));
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ptr = ((char *)ep) + rp->b_read;
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if (step_len && copy_to_user(buf, ptr, step_len)) {
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mutex_unlock(&rp->fetch_lock);
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@ -687,13 +773,13 @@ static ssize_t mon_bin_read(struct file *file, char __user *buf,
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done += step_len;
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}
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if (rp->b_read >= sizeof(struct mon_bin_hdr)) {
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if (rp->b_read >= hdrbytes) {
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step_len = ep->len_cap;
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step_len -= rp->b_read - sizeof(struct mon_bin_hdr);
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step_len -= rp->b_read - hdrbytes;
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if (step_len > nbytes)
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step_len = nbytes;
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offset = rp->b_out + PKT_SIZE;
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offset += rp->b_read - sizeof(struct mon_bin_hdr);
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offset += rp->b_read - hdrbytes;
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if (offset >= rp->b_size)
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offset -= rp->b_size;
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if (copy_from_buf(rp, offset, buf, step_len)) {
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@ -709,7 +795,7 @@ static ssize_t mon_bin_read(struct file *file, char __user *buf,
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/*
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* Check if whole packet was read, and if so, jump to the next one.
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*/
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if (rp->b_read >= sizeof(struct mon_bin_hdr) + ep->len_cap) {
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if (rp->b_read >= hdrbytes + ep->len_cap) {
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spin_lock_irqsave(&rp->b_lock, flags);
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mon_buff_area_free(rp, PKT_SIZE + ep->len_cap);
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spin_unlock_irqrestore(&rp->b_lock, flags);
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@ -908,6 +994,7 @@ static int mon_bin_ioctl(struct inode *inode, struct file *file,
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break;
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case MON_IOCX_GET:
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case MON_IOCX_GETX:
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{
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struct mon_bin_get getb;
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@ -917,8 +1004,9 @@ static int mon_bin_ioctl(struct inode *inode, struct file *file,
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if (getb.alloc > 0x10000000) /* Want to cast to u32 */
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return -EINVAL;
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ret = mon_bin_get_event(file, rp,
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getb.hdr, getb.data, (unsigned int)getb.alloc);
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ret = mon_bin_get_event(file, rp, getb.hdr,
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(cmd == MON_IOCX_GET)? PKT_SZ_API0: PKT_SZ_API1,
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getb.data, (unsigned int)getb.alloc);
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}
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break;
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@ -984,16 +1072,18 @@ static long mon_bin_compat_ioctl(struct file *file,
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switch (cmd) {
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case MON_IOCX_GET32: {
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case MON_IOCX_GET32:
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case MON_IOCX_GETX32:
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{
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struct mon_bin_get32 getb;
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if (copy_from_user(&getb, (void __user *)arg,
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sizeof(struct mon_bin_get32)))
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return -EFAULT;
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ret = mon_bin_get_event(file, rp,
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compat_ptr(getb.hdr32), compat_ptr(getb.data32),
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getb.alloc32);
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ret = mon_bin_get_event(file, rp, compat_ptr(getb.hdr32),
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(cmd == MON_IOCX_GET32)? PKT_SZ_API0: PKT_SZ_API1,
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compat_ptr(getb.data32), getb.alloc32);
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if (ret < 0)
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return ret;
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}
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