netdev - Re: [PATCH ipsec-next v2] xfrm: fix bug with DSCP copy to v6 from v4 tunnel

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Message-ID: <m2sffw17ti.fsf@ja.int.chopps.org>
Date:   Fri, 27 Jan 2023 07:22:40 -0500
From:   Christian Hopps <chopps@...pps.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Christian Hopps <chopps@...pps.org>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        "David S. Miller" <davem@...emloft.net>, devel@...ux-ipsec.org,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        chopps@...n.net
Subject: Re: [PATCH ipsec-next v2] xfrm: fix bug with DSCP copy to v6 from
 v4 tunnel


Herbert Xu <herbert@...dor.apana.org.au> writes:

> On Thu, Jan 26, 2023 at 11:33:50AM -0500, Christian Hopps wrote:
>> When copying the DSCP bits for decap-dscp into IPv6 don't assume the
>> outer encap is always IPv6. Instead, as with the inner IPv4 case, copy
>> the DSCP bits from the correctly saved "tos" value in the control block.
>>
>> Fixes: 227620e29509 ("[IPSEC]: Separate inner/outer mode processing on input")
>
> Please fix this Fixes header as that commit did not introduce
> this bug.

This was a suggested add from Eyal that I was initially hesitant to add. He justified it b/c this commit purported to add support for mixed versions and this is a bug in that new functionality. It is useful to have that tracked which is why I added it. Is there a better way to track that?

Thanks,
Chris.