[net-next,v17,00/25] Introducing OpenVPN Data Channel Offload

Message

Antonio Quartulli Jan. 10, 2025, 10:26 p.m. UTC

Notable changes since v16:
* fixed usage of netdev tracker by removing dev_tracker member from
  ovpn_priv and adding it to ovpn_peer and ovpn_socket as those are the
  objects really holding a ref to the netdev
* switched ovpn_get_dev_from_attrs() to GFP_ATOMIC to prevent sleep under
  rcu_read_lock
* allocated netdevice_tracker in ovpn_nl_pre_doit() [stored in
  user_ptr[1]] to keep track of the netdev reference held during netlink
  handler calls
* moved whole socket detaching routine to worker. This way the code is
  allowed to sleep and in turn it can be executed under lock_sock. This
  lock allows us to happily coordinate concurrent attach/detach calls.
  (note: lock is acquired everytime the refcnt for the socket is
  decremented, because this guarantees us that setting the refcnt to 0
  and detaching the socket will happen atomically)
* dropped kref_put_sock()/refcount handler as it's not required anymore,
  thanks to the point above
* re-arranged ovpn_socket_new() in order to simplify error path by first
  allocating the new ovpn_sock and then attaching

Please note that some patches were already reviewed/tested by a few
people. iThese patches have retained the tags as they have hardly been
touched.

The latest code can also be found at:

https://github.com/OpenVPN/linux-kernel-ovpn

Thanks a lot!
Best Regards,

Antonio Quartulli
OpenVPN Inc.

---
Antonio Quartulli (25):
      net: introduce OpenVPN Data Channel Offload (ovpn)
      ovpn: add basic netlink support
      ovpn: add basic interface creation/destruction/management routines
      ovpn: keep carrier always on for MP interfaces
      ovpn: introduce the ovpn_peer object
      ovpn: introduce the ovpn_socket object
      ovpn: implement basic TX path (UDP)
      ovpn: implement basic RX path (UDP)
      ovpn: implement packet processing
      ovpn: store tunnel and transport statistics
      ipv6: export inet6_stream_ops via EXPORT_SYMBOL_GPL
      ovpn: implement TCP transport
      skb: implement skb_send_sock_locked_with_flags()
      ovpn: add support for MSG_NOSIGNAL in tcp_sendmsg
      ovpn: implement multi-peer support
      ovpn: implement peer lookup logic
      ovpn: implement keepalive mechanism
      ovpn: add support for updating local UDP endpoint
      ovpn: add support for peer floating
      ovpn: implement peer add/get/dump/delete via netlink
      ovpn: implement key add/get/del/swap via netlink
      ovpn: kill key and notify userspace in case of IV exhaustion
      ovpn: notify userspace when a peer is deleted
      ovpn: add basic ethtool support
      testing/selftests: add test tool and scripts for ovpn module

 Documentation/netlink/specs/ovpn.yaml              |  372 +++
 Documentation/netlink/specs/rt_link.yaml           |   16 +
 MAINTAINERS                                        |   11 +
 drivers/net/Kconfig                                |   15 +
 drivers/net/Makefile                               |    1 +
 drivers/net/ovpn/Makefile                          |   22 +
 drivers/net/ovpn/bind.c                            |   55 +
 drivers/net/ovpn/bind.h                            |  101 +
 drivers/net/ovpn/crypto.c                          |  211 ++
 drivers/net/ovpn/crypto.h                          |  145 ++
 drivers/net/ovpn/crypto_aead.c                     |  382 ++++
 drivers/net/ovpn/crypto_aead.h                     |   33 +
 drivers/net/ovpn/io.c                              |  446 ++++
 drivers/net/ovpn/io.h                              |   34 +
 drivers/net/ovpn/main.c                            |  350 +++
 drivers/net/ovpn/main.h                            |   14 +
 drivers/net/ovpn/netlink-gen.c                     |  213 ++
 drivers/net/ovpn/netlink-gen.h                     |   41 +
 drivers/net/ovpn/netlink.c                         | 1183 ++++++++++
 drivers/net/ovpn/netlink.h                         |   18 +
 drivers/net/ovpn/ovpnstruct.h                      |   54 +
 drivers/net/ovpn/peer.c                            | 1269 +++++++++++
 drivers/net/ovpn/peer.h                            |  164 ++
 drivers/net/ovpn/pktid.c                           |  129 ++
 drivers/net/ovpn/pktid.h                           |   87 +
 drivers/net/ovpn/proto.h                           |  118 +
 drivers/net/ovpn/skb.h                             |   60 +
 drivers/net/ovpn/socket.c                          |  204 ++
 drivers/net/ovpn/socket.h                          |   49 +
 drivers/net/ovpn/stats.c                           |   21 +
 drivers/net/ovpn/stats.h                           |   47 +
 drivers/net/ovpn/tcp.c                             |  565 +++++
 drivers/net/ovpn/tcp.h                             |   33 +
 drivers/net/ovpn/udp.c                             |  421 ++++
 drivers/net/ovpn/udp.h                             |   22 +
 include/linux/skbuff.h                             |    2 +
 include/uapi/linux/if_link.h                       |   15 +
 include/uapi/linux/ovpn.h                          |  111 +
 include/uapi/linux/udp.h                           |    1 +
 net/core/skbuff.c                                  |   18 +-
 net/ipv6/af_inet6.c                                |    1 +
 tools/testing/selftests/Makefile                   |    1 +
 tools/testing/selftests/net/ovpn/.gitignore        |    2 +
 tools/testing/selftests/net/ovpn/Makefile          |   17 +
 tools/testing/selftests/net/ovpn/config            |   10 +
 tools/testing/selftests/net/ovpn/data64.key        |    5 +
 tools/testing/selftests/net/ovpn/ovpn-cli.c        | 2366 ++++++++++++++++++++
 tools/testing/selftests/net/ovpn/tcp_peers.txt     |    5 +
 .../testing/selftests/net/ovpn/test-chachapoly.sh  |    9 +
 tools/testing/selftests/net/ovpn/test-float.sh     |    9 +
 tools/testing/selftests/net/ovpn/test-tcp.sh       |    9 +
 tools/testing/selftests/net/ovpn/test.sh           |  185 ++
 tools/testing/selftests/net/ovpn/udp_peers.txt     |    5 +
 53 files changed, 9672 insertions(+), 5 deletions(-)
---
base-commit: 7b24f164cf005b9649138ef6de94aaac49c9f3d1
change-id: 20241002-b4-ovpn-eeee35c694a2

Best regards,