Bug#965074: cdc_ncm: ethernet multicast traffic is filtered out

[wxcafe <wxcafe@wxcafe.net>]

Package: linux-image-amd64
Version: 4.19+105+deb10u4
Severity: important
Tags: ipv6

Hey,

linux's cdc_ncm driver has a bug with multicast ethernet traffic, which breaks
mDNS and ipv6, among other things. Miguel Rodríguez Pérez (miguel@det.uvigo.gal)
wrote patches fixing that two years ago, but they never got merged even though
as far as I can tell he fixed all the problems mentionned.
(https://patchwork.kernel.org/project/linux-usb/list/?submitter=181339&state=%2A&archive=both)

I tried rebasing them on current mainline (5.7.8/5.8.0-rc5) and submit them but
have been met with a lot of trouble with my formatting, and also don't want to
use my real name (see https://marc.info/?l=linux-netdev&m=159467301013480&w=2 https://marc.info/?t=159477625000002&r=1&w=2 https://marc.info/?t=159477644000003&r=1&w=2 https://marc.info/?t=159477680800001&r=1&w=2 https://marc.info/?t=159477644200002&r=1&w=2 https://marc.info/?t=159477662400001&r=1&w=2 etc)

As far as I know nothing should pose any problem with merging these, all the
objections mentionned in the thread are resolved (as far as I can tell, I'm not
a kernel dev), they build correctly on mainline, and work well.

Cheers.

-- System Information:
Debian Release: 10.4
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.5.0-0.bpo.2-amd64 (SMP w/4 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages linux-image-amd64 depends on:
ii  linux-image-4.19.0-9-amd64  4.19.118-2

linux-image-amd64 recommends no packages.

linux-image-amd64 suggests no packages.

-- no debconf information