netdev - [PATCH 0/2 ] cdc_ncm: Handle multicast Ethernet traffic

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Date:   Sat, 30 Jun 2018 13:21:13 +0200
From:   Miguel Rodríguez Pérez <miguel@....uvigo.gal>
To:     linux-usb@...r.kernel.org
Cc:     netdev@...r.kernel.org
Subject: [PATCH 0/2 ] cdc_ncm: Handle multicast Ethernet traffic

Sending again, as the previous try had the wrong subjects. Sorry about that.

Dell D6000 dock (and I guess other docks too) exposes a CDC_NCM device
for Ethernet traffic. However, multicast Ethernet traffic is not
processed making IPv6 not functional. Other services, like mDNS used for
LAN service discovery are also hindered.

The actual reason is that CDC_NCM driver was not processing requests to
filter (admit) multicast traffic. I provide two patches to the linux
kernel that admit all Ethernet multicast traffic whenever a multicast
group is being joined.

The solution is not optimal, as it makes the system receive more traffic
than that strictly needed, but otherwise this only happens when the
computer is connected to a dock and thus is running on AC power. I
believe it is not worth the hassle to join only the requested groups.
This is the same that is done in the CDN_ETHER driver.

Best regards,

-- 
Miguel Rodríguez Pérez
Laboratorio de Redes
EE Telecomunicación – Universidade de Vigo