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

Michal Soltys [off-list ref] wrote:

On 3/29/21 10:52 PM, Ido Schimmel wrote:

quoted

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).

Fixing this would be better. As Ido implies it should be enough to fully
populate the flow keys in ip(6)_route_me_harder.