netdev - Re: [BUG / question] in routing rules, some options (e.g. ipproto, sport) cause rules to be ignored in presence of packet marks

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Date:   Fri, 9 Apr 2021 14:11:34 +0200
From:   Michal Soltys <msoltyspl@...dex.pl>
To:     Ido Schimmel <idosch@...sch.org>
Cc:     Linux Netdev List <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>
Subject: Re: [BUG / question] in routing rules, some options (e.g. ipproto,
 sport) cause rules to be ignored in presence of packet marks

On 3/29/21 10:52 PM, Ido Schimmel wrote:
> 
> ip_route_me_harder() does not set source / destination port in the
> flow key, so it explains why fib rules that use them are not hit after
> mangling the packet. These keys were added in 4.17, but I
> don't think this use case every worked. You have a different experience?
> 

So all the more recent additions to routing rules - src port, dst port, 
uid range and ipproto - are not functioning correctly with the second 
routing check.

Are there plans to eventually fix that ?

While I just adjusted/rearranged my stuff to not rely on those, it 
should probably be at least documented otherwise (presumably in ip-rule 
manpage and perhaps in `ip rule help` as well).