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Message-Id: <20230227074104.42153-1-josef@miegl.cz> Date: Mon, 27 Feb 2023 08:41:03 +0100 From: Josef Miegl <josef@...gl.cz> To: unlisted-recipients:; (no To-header on input) Cc: Josef Miegl <josef@...gl.cz>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH v2 0/1] net: geneve: accept every ethertype The Geneve encapsulation, as defined in RFC 8926, has a Protocol Type field, which states the Ethertype of the payload appearing after the Geneve header. Commit 435fe1c0c1f7 ("net: geneve: support IPv4/IPv6 as inner protocol") introduced a new IFLA_GENEVE_INNER_PROTO_INHERIT flag that allowed the use of other Ethertypes than Ethernet. However, for a reason not known to me, it imposed a restriction that prohibits receiving payloads other than IPv4, IPv6 and Ethernet. This patch removes this restriction, making it possible to receive any Ethertype as a payload, if the IFLA_GENEVE_INNER_PROTO_INHERIT flag is set. This is especially useful if one wants to encapsulate MPLS, because with this patch the control-plane traffic (IP, LLC) and the data-plane traffic (MPLS) can be encapsulated without an Ethernet frame, making lightweight overlay networks a possibility. Changes in v2: - added a cover letter - lines no longer exceed 80 columns Josef Miegl (1): net: geneve: accept every ethertype drivers/net/geneve.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-) -- 2.37.1
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