Date: Sat, 4 Dec 2021 18:42:56 +0000 From: "Alexander V. Chernikov" <melifaro@ipfw.ru> To: Neel Chauhan <nc@FreeBSD.org> Cc: freebsd-net@freebsd.org Subject: Re: Porting OpenBSD MPLS to FreeBSD Message-ID: <3A76E553-BB42-4C38-A589-872BBB64301F@ipfw.ru> In-Reply-To: <7de5f4bf0fdec027b5ae5d844a7cb0f5@FreeBSD.org> References: <7de5f4bf0fdec027b5ae5d844a7cb0f5@FreeBSD.org>
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> On 19 Nov 2021, at 19:17, Neel Chauhan <nc@FreeBSD.org> wrote: >=20 > Hi freebsd-net@, >=20 > Long time no see. I've gotten a (Ports) commit bit since then. >=20 > I haven't been very active in TCP/IP hacking as of late, as more = recently I've been more focused on GNOME packages and some GPU drivers. >=20 > Going back, I'm thinking about porting OpenBSD's MPLS to FreeBSD. >=20 > I have a two questions: >=20 > * Is porting OpenBSD MPLS to FreeBSD feasible, or are we better off = doing a from-scratch implementation based on netgraph? It depends. MPLS implementaiton can be splitted into multiple logical = parts - dataplane (input, control, output, forward) and control plane = (programming ip routes+mpls and mpls-only fowarding state). Some parts = of the former can indeed be imported from OpenBSD. However, most of the = control plane part have to be written from scratch. Finally, it may be = desired to maintain an programming interface close to the one already = implemented in major routing SW (frr, bird) - I guess that would be = simpler to achieve with native, non-netgraph implementation. >=20 > * Would some of the other committers here be willing to mentor/help me = if needed? I=E2=80=99d love to. Most of my the routing-related stack changes = (modular lookup framework, nexthops, rtsock cleanups) were done to = enable efficient kernel-based MPLS implementation. >=20 > Unlike my old IPFW patches which got nowhere (plus I no longer use = IPFW), I feel this is more something that could be useful when running = FreeBSD as a router, but hasn't really been done. >=20 > -Neel (nc@) >=20
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