From:   Josef Miegl <josef@miegl.cz>
Cc:     Josef Miegl <josef@miegl.cz>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v2 0/1] net: geneve: accept every ethertype
Date:   Mon, 27 Feb 2023 08:41:03 +0100
Message-Id: <20230227074104.42153-1-josef@miegl.cz>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
To:     unlisted-recipients:; (no To-header on input)
Precedence: bulk

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