[RFC,v4,00/11] qapi: net: add unix socket type support to netdev backend

Message

Laurent Vivier June 23, 2022, 3:53 p.m. UTC

"-netdev socket" only supports inet sockets.

It's not a complex task to add support for unix sockets, but
the socket netdev parameters are not defined to manage well unix
socket parameters.

As discussed in:

  "socket.c added support for unix domain socket datagram transport"
  https://lore.kernel.org/qemu-devel/[e-mail]/

This series adds support of unix socket type using SocketAddress QAPI structure.

Two new netdev backends, "stream" and "dgram" are added, that are barely a copy of "socket"
backend but they use the SocketAddress QAPI to provide socket parameters.
And then they also implement unix sockets (TCP and UDP).

Some examples of CLI syntax:

  for TCP:

  -netdev stream,id=socket0,addr.type=inet,addr.host=localhost,addr.port=1234
  -netdev stream,id=socket0,server=off,addr.type=inet,addr.host=localhost,addr.port=1234

  -netdev dgram,id=socket0,\
          local.type=inet,local.host=localhost,local.port=1234,\
          remote.type=inet,remote.host=localhost,remote.port=1235

  for UNIX:

  -netdev stream,id=socket0,addr.type=unix,addr.path=/tmp/qemu0
  -netdev stream,id=socket0,server=off,addr.type=unix,addr.path=/tmp/qemu0

  -netdev dgram,id=socket0,\
          local.type=unix,local.path=/tmp/qemu0,\
          remote.type=unix,remote.path=/tmp/qemu1

  for FD:

  -netdev stream,id=socket0,addr.type=fd,addr.str=4
  -netdev stream,id=socket0,server=off,addr.type=fd,addr.str=5

  -netdev dgram,id=socket0,local.type=fd,addr.str=4

v4:
  - net_client_parse() fails with exit() rather than with return.
  - keep "{ 'name': 'vmnet-host', 'if': 'CONFIG_VMNET' }" on its
    own line in qapi/net.json
  - add a comment in qapi/net.json about parameters usage
  - move netdev_is_modern() check to qemu_init()
  - in netdev_is_modern(), check for JSON and use qemu_opts_do_parse()
    to parse parameters and detect type value.
  - add a blank line after copyright comment

v3:
  - remove support of "-net" for dgram and stream. They are only
    supported with "-netdev" option.
  - use &error_fatal directly in net_client_inits()
  - update qemu-options.hx
  - move to QIO for stream socket

v2:
  - use "stream" and "dgram" rather than "socket-ng,mode=stream"
    and ""socket-ng,mode=dgram"
  - extract code to bypass qemu_opts_parse_noisily() to
    a new patch
  - do not ignore EINVAL (Stefano)
  - fix "-net" option

CC: Ralph Schmieder <[e-mail]>
CC: Stefano Brivio <[e-mail]>
CC: Daniel P. Berrangé <[e-mail]>
CC: Markus Armbruster <[e-mail]>

Laurent Vivier (10):
  net: introduce convert_host_port()
  net: remove the @errp argument of net_client_inits()
  qapi: net: introduce a way to bypass qemu_opts_parse_noisily()
  qapi: net: add stream and dgram netdevs
  net: stream: add unix socket
  net: dgram: make dgram_dst generic
  net: dgram: move mcast specific code from net_socket_fd_init_dgram()
  net: dgram: add unix socket
  qemu-sockets: introduce socket_uri()
  net: stream: move to QIO

Stefano Brivio (1):
  net: stream: Don't ignore EINVAL on netdev socket connection

 hmp-commands.hx        |   2 +-
 include/net/net.h      |   6 +-
 include/qemu/sockets.h |   4 +-
 monitor/hmp-cmds.c     |  23 +-
 net/clients.h          |   6 +
 net/dgram.c            | 707 +++++++++++++++++++++++++++++++++++++++++
 net/hub.c              |   2 +
 net/meson.build        |   2 +
 net/net.c              | 170 +++++++---
 net/stream.c           | 372 ++++++++++++++++++++++
 qapi/net.json          |  44 ++-
 qemu-options.hx        |  12 +
 softmmu/vl.c           |  16 +-
 util/qemu-sockets.c    |  20 ++
 14 files changed, 1304 insertions(+), 82 deletions(-)
 create mode 100644 net/dgram.c
 create mode 100644 net/stream.c