Re: Legacy configuration for NCM/RNDIS does not work for Win >= 10

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On Fri, 2023-03-10 at 13:27 +0100, Joakim Tjernlund wrote:
> On Fri, 2023-03-10 at 10:55 +0100, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
> > On Fri, Mar 10, 2023 at 09:44:26AM +0000, Joakim Tjernlund wrote:
> > > The old RNDIS/NCM configs does not work against modern Windows. I wonder if there
> > > should/could be updated to working state ?
> > 
> > Please never use RNDIS on modern systems unless you fully trust the
> > "other side" of the connection as it is not a secure protocol by any
> > means.
> 
> Yes, we will move to NCM (new in >= Windows 10)
> 
> > 
> > NCM should "just work" instead.  What exactly is failing, and what
> > specifically do you mean by "modern Windows"?
> 
> NCM does not just work on Windows >= 10 it needs configfs settings:
> 
> NCM snipped:
> 	echo 1       > os_desc/use
> 	echo 0xbc    > os_desc/b_vendor_code
> 	echo MSFT100 > os_desc/qw_sign
> 
> 	mkdir functions/ncm.usb0
> 	mkdir -p functions/ncm.usb0/os_desc/interface.ncm
>     #Set compatible id so that Windows 10 can match this function to
>     # NCM driver more easily.
> 	echo WINNCM   > functions/ncm.usb0/os_desc/interface.ncm/compatible_id
> 
> 	mkdir -p configs/c.1
> 	mkdir -p configs/c.1/strings/0x409
> 	echo "conf1" > configs/c.1/strings/0x409/configuration
> 	ln -s functions/ncm.usb0 configs/c.1
> 	if [ ! -L os_desc/c.1 ]
> 	then
> 		 ln -s configs/c.1 os_desc
> 	fi
> 
> New RNDIS in Windows >= 10
> 	echo 1       > os_desc/use
> 	echo 0xbc    > os_desc/b_vendor_code
> 	echo MSFT100 > os_desc/qw_sign
> 
> 	mkdir functions/rndis.usb0
> 	mkdir -p functions/rndis.usb0/os_desc/interface.rndis
> 
> 	#Set compatible / sub-compatible id's so that Windows can match this
>     # function to RNDIS6 driver more easily.
> 	echo RNDIS   > functions/rndis.usb0/os_desc/interface.rndis/compatible_id
> 	echo 5162001 > functions/rndis.usb0/os_desc/interface.rndis/sub_compatible_id
> 
> 	mkdir -p configs/c.1
> 	mkdir -p configs/c.1/strings/0x409
> 	echo "conf1" > configs/c.1/strings/0x409/configuration
> 	ln -s functions/rndis.usb0 configs/c.1
> 	if [ ! -L os_desc/c.1 ]
> 	then
> 	 	ln -s configs/c.1 os_desc


Did this make any sense to you ? The old legacy/builtin configs does not do any of this.

 Jocke




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