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Bug#1024328: IPv6 connectivity broken with 6.0.x. RAs seem to be dropped for the CDC_NCM interface

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Control: tags -1 + upstream patch

Hi there,

El 17/11/22 a las 17:08, Santiago R.R. escribió:
> Package: src:linux
> Version: 6.0.8-1
> Severity: important
> Tags: ipv6
> Control: Found -1 6.1~rc3-1~exp1
> 
> Dear linux maintainers,
> 
> The related machine to this bug is connected to the network via a Dell
> D6000 USB-C docking station. Since a recent linux-image-amd64 update, it
> cannot reach external networks on IPv6. It is able to autoconfigure an
> IPv6 address, but it doesn't get any answer to the router sollicitations
> messages, so it is not able to configure any default route.
> 
> A WiFi interface successfully configures its ip6 route, running on the
> same kernel.
> 
> The problem didn't exist on 5.x, since 5.9 (when IP6 multicast support
> for cdc_ncm was fixed). I've just checked with
> linux-image-5.10.0-12-amd64.
> And the problem is also present in linux-image-6.1.0-0-amd64 6.1~rc3-1~exp1.
> 
> Concerned devices is:
> 
>   *-network
>        description: Ethernet interface
>        physical id: 14
>        bus info: usb@2:1.1
>        logical name: enxabcdef123456
>        serial: ab:cd:ef:12:34:56
>        size: 100Mbit/s
>        capabilities: ethernet physical
>        configuration: autonegotiation=off broadcast=yes driver=cdc_ncm driverversion=6.0.0-4-amd64 duplex=half firmware=CDC NCM (SEND ZLP) ip=x.x.x.x link=yes multicast=yes port=twisted pair speed=100Mbit/s
> 
[snip]

I've tested the attached patch against debian/6.1_rc5-1_exp1, and IPv6
connectivity is restored in my machine on the DisplayLink-based Dell
D6000 dock.

For convenience, I've created a MR:
https://salsa.debian.org/kernel-team/linux/-/merge_requests/588

Cheers,

 -- Santiago

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Bug#1024328: IPv6 connectivity broken with 6.0.x. RAs seem to be dropped for the CDC_NCM interface "Santiago R.R." <santiagorr@riseup.net> - 2022-11-17 17:10 +0100
  Bug#1024328: IPv6 connectivity broken with 6.0.x. RAs seem to be dropped for the CDC_NCM interface Santiago Ruano Rincón <santiagorr@riseup.net> - 2022-11-21 15:30 +0100
  Bug#1024328: closed by Debian FTP Masters <ftpmaster@ftp-master.debian.org> (reply to Salvatore Bonaccorso <carnil@debian.org>) (Bug#1024328: fixed in linux 6.0.10-1) "Santiago R.R." <santiagorr@riseup.net> - 2022-11-28 09:50 +0100

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