From: Stefan Sperling <stsp@stsp.name>
Subject: Re: if_urndis: match USB RNDIS (ef/04/01) [Mudi 7 router]
To: Nick H <nickcph@gmail.com>
Cc: tech@openbsd.org
Date: Fri, 16 Oct 2026 11:47:52 +0200

On Thu, Oct 15, 2026 at 06:53:03PM +0100, Nick H wrote:
> I can connect from my OpenBSD laptop to a new Mudi 7 travel router
> using its wired ethernet port and wireless mode, but not via urndis
> using the USB-C cable. The device showed in dmesg as:
> 
> ugen2 at uhub1 port 4 "GL.iNet Mudi 7 (GL-E5800)" rev 3.20/5.15 addr 5
> 
> I looked at the USB descriptors for the device, it had a class of
> "ef", a subclass of "04", and a protocol of "01" which was not being
> matched and falling back to ugen.
> 
> Below are patches for /usr/src/sys/dev/usb/usb.h and
> /usr/src/sys/dev/usb/if_urndis.c to match the additional subclass and
> protocol, similar to what currently exists in NetBSD. After patching,
> rebuilding the kernel, and rebooting, dmesg shows:
> 
> urndis0 at uhub1 port 4 configuration 1 interface 0 "GL.iNet Mudi 7
> (GL-E5800)" rev 3.20/5.15 addr 5
> urndis0: using RNDIS over Ethernet, address 7c:84:c1:xx:xx:xx
> ugen2 at uhub1 port 4 configuration 1 "GL.iNet Mudi 7 (GL-E5800)" rev
> 3.20/5.15 addr 5
> 
> Adding "dhcp" to /etc/hostname.urndis0 and running sh /etc/netstart
> urndis0, the interface receives an address allocated by the Mudi and I
> can successfully connect to its upstream networks. Tested on a
> Thinkpad X1 Carbon Gen 6 running OpenBSD-CURRENT with Mudi 7 router
> (firmware 4.10.0, September 2026) set to USB Tethering mode.
> 
> v/r
> Nick

Committed, thank you!