netdev - Re: [RFC PATCH net-next 2/3] netfilter: nft_fib: Mask upper DSCP bits before FIB lookup

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Message-ID: <ZqOhXSYp6yHlcNmy@debian>
Date: Fri, 26 Jul 2024 15:15:09 +0200
From: Guillaume Nault <gnault@...hat.com>
To: Ido Schimmel <idosch@...dia.com>
Cc: netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
	edumazet@...gle.com, dsahern@...nel.org, pablo@...filter.org,
	kadlec@...filter.org, fw@...len.de
Subject: Re: [RFC PATCH net-next 2/3] netfilter: nft_fib: Mask upper DSCP
 bits before FIB lookup

On Thu, Jul 25, 2024 at 04:17:28PM +0300, Ido Schimmel wrote:
> As part of its functionality, the nftables FIB expression module
> performs a FIB lookup, but unlike other users of the FIB lookup API, it
> does so without masking the upper DSCP bits. In particular, this differs
> from the equivalent iptables match ("rpfilter") that does mask the upper
> DSCP bits before the FIB lookup.
> 
> Align the module to other users of the FIB lookup API and mask the upper
> DSCP bits using IPTOS_RT_MASK before the lookup.

If Florian and Pablo are okay with this change and the long term plan
to allow full DSCP match, then I'm all for it.

Reviewed-by: Guillaume Nault <gnault@...hat.com>