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Date: Mon, 2 Sep 2019 15:07:31 -0700 From: Dave Taht <dave.taht@...il.com> To: Linux Kernel Network Developers <netdev@...r.kernel.org> Subject: how to search for the best route from userspace in netlink? Windows has the "RtmGetMostSpecificDestination" call: https://docs.microsoft.com/en-us/windows/win32/rras/search-for-the-best-route In particular, I wanted to search for the best route, AND pick up the PMTU from that (if it existed) for older UDP applications like dnssec[1] and newer ones like QUIC[2]. The alternatives, which basically include probing perpetually and/or picking really low values, seem increasingly less than optimal. Put in a wrapper around bpf[3]'s lpm calls? Create a new netlink message? [1] https://github.com/dns-violations/dnsflagday/issues/125 [2] https://tools.ietf.org/html/draft-ietf-quic-transport-22#section-14.1 [3] https://github.com/torvalds/linux/blob/master/kernel/bpf/lpm_trie.c#L164 -- Dave Täht CTO, TekLibre, LLC http://www.teklibre.com Tel: 1-831-205-9740
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