netdev - Re: how to search for the best route from userspace in netlink?

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Date:   Mon, 2 Sep 2019 21:13:40 -0600
From:   David Ahern <dsahern@...il.com>
To:     Dave Taht <dave.taht@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: how to search for the best route from userspace in netlink?

On 9/2/19 4:07 PM, Dave Taht wrote:
> 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].

RTM_GETROUTE with data for the route lookup. See iproute2 code as an
example.