On Wed, Dec 01, 2010 at 06:58:18PM -0500, Jung-uk Kim wrote:
> On Tuesday 30 November 2010 10:51 pm, Weongyo Jeong wrote:
> > Author: weongyo
> > Date: Wed Dec 1 03:51:06 2010
> > New Revision: 216091
> > URL: http://svn.freebsd.org/changeset/base/216091
> >
> > Log:
> > Explicitly UP and DOWN the usbus interfaces (IFT_USB) when it's
> > attached or detached. Normally it should be changed through user
> > land ioctl(2) system calls but it looks there's no apps for USB and
> > no need.
> >
> > With this patch, libpcap would detect the usbus interfaces
> > correctly and tcpdump(1) could dump the USB packets into PCAP
> > format with -w option. However it couldn't print the output to
> > console because there's no printer-routine at tcpdump(1).
>
> I have written a very hackish USB packet printer for tcpdump based on
> Linux version.
>
> http://people.freebsd.org/~jkim/tcpdump-usb.diff
Looks good to me.
> Note we can only print headers as Linux version does.
>
> Are you planning on adopting DLT_USB_LINUX or DLT_USB_LINUX_MMAPPED or
> applying for our own DLT, BTW?
Frankly speaking, not sure yet. As you know, DLT_USB_LINUX and
DLT_USB_LINUX_MMAPPED types are very specific only for Linux and each
types has different structure size (48 bytes and 64 bytes). IMHO linux
thought their own format only instead of thinking/defining a generic
format.
I think we have some cases we could select as follows:
1) Define a generic USB packet header form and make a consensus with
linux guys then uses DLT_USB type.
2) Define DLT_USB_BSD and write our own code.
3) Changes `struct usbpf_pkthdr' to be compatible with linux format
though it's expected to have some wasted variables (e.g. time
stamp).
regards,
Weongyo Jeong
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