On Fri, Mar 26, 2021 at 01:00:52PM +0100, Marcel Krüger wrote:

Hi,

is there any way to identify in a filter the interface the route was learned from? So basically an attribute which relates to "from" like ifname and ifindex relate to "gw"? This would be particularly useful when "from" is a link lcal address and therefore might not be enough to identify the source.

If this doesn't exists, is there another way to enforce that the "gw" is always on the same interface the route was learned on whithout .. If not, would a patch implementing such an route attribute have a chance of being merged?

Hi Iface associated with 'from' is not stored internally. Check like 'gw = from' work also for link local address, because link-local next_hop is resolved only on the same iface, but that is more strict check that you wanted. We currently do not support iface as a value for regular attributes ('ifname' itself is an exception and only a temporary solution), but we have some pending patches that redesign route attributes. -- Elen sila lumenn' omentielvo Ondrej 'Santiago' Zajicek (email: santiago@crfreenet.org) OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net) "To err is human -- to blame it on a computer is even more so."