linux-kernel - [PATCH v2 0/1] net: geneve: accept every ethertype

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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