linux-kernel - [PATCH net-next 0/7] net: consolidate IPv4 route lookup for UDP tunnels

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Message-Id: <20231009082059.2500217-1-b.galvani@gmail.com>
Date:   Mon,  9 Oct 2023 10:20:52 +0200
From:   Beniamino Galvani <b.galvani@...il.com>
To:     netdev@...r.kernel.org
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        David Ahern <dsahern@...nel.org>,
        Guillaume Nault <gnault@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 0/7] net: consolidate IPv4 route lookup for UDP tunnels

At the moment different UDP tunnels rely on different functions for
IPv4 route lookup, and those functions all implement the same
logic. Only bareudp uses the generic ip_route_output_tunnel(), while
geneve and vxlan basically duplicate it slightly differently.

This series first extends the generic lookup function so that it is
suitable for all UDP tunnel implementations. Then, bareudp, geneve and
vxlan are adapted to use them.

This results in code with less duplication and hopefully better
maintainability.

After this series is merged, IPv6 will be converted in a similar way.

Beniamino Galvani (7):
  ipv4: rename and move ip_route_output_tunnel()
  ipv4: remove "proto" argument from udp_tunnel_dst_lookup()
  ipv4: add new arguments to udp_tunnel_dst_lookup()
  ipv4: use tunnel flow flags for tunnel route lookups
  geneve: add dsfield helper function
  geneve: use generic function for tunnel IPv4 route lookup
  vxlan: use generic function for tunnel IPv4 route lookup

 drivers/net/bareudp.c          |  11 ++--
 drivers/net/geneve.c           | 111 +++++++++++++--------------------
 drivers/net/vxlan/vxlan_core.c | 103 +++++++++++-------------------
 include/net/route.h            |   6 --
 include/net/udp_tunnel.h       |   8 +++
 net/ipv4/route.c               |  48 --------------
 net/ipv4/udp_tunnel_core.c     |  49 +++++++++++++++
 7 files changed, 141 insertions(+), 195 deletions(-)

-- 
2.40.1