Laurent Vivier <lviv...@redhat.com> writes:
> Copied from socket netdev file and modified to use SocketAddress
> to be able to introduce new features like unix socket.
>
> "udp" and "mcast" are squashed into dgram netdev, multicast is detected
> according to the IP address type.
> "listen" and "connect" modes are managed by stream netdev. An optional
> parameter "server" defines the mode (server by default)
>
> The two new types need to be parsed the modern way with -netdev, because
> with the traditional way, the "type" field of netdev structure collides with
> the "type" field of SocketAddress and prevents the correct evaluation of the
> command line option. Moreover the traditional way doesn't allow to use
> the same type (SocketAddress) several times with the -netdev option
> (needed to specify "local" and "remote" addresses).
>
> The previous commit paved the way for parsing the modern way, but
> omitted one detail: how to pick modern vs. traditional, in
> netdev_is_modern().
>
> We want to pick based on the value of parameter "type". But how to
> extract it from the option argument?
>
> Parsing the option argument, either the modern or the traditional way,
> extracts it for us, but only if parsing succeeds.
>
> If parsing fails, there is no good option. No matter which parser we
> pick, it'll be the wrong one for some arguments, and the error
> reporting will be confusing.
>
> Fortunately, the traditional parser accepts *anything* when called in
> a certain way. This maximizes our chance to extract the value of
> "type", and in turn minimizes the risk of confusing error reporting.
>
> Signed-off-by: Laurent Vivier <lviv...@redhat.com>
> Reviewed-by: Stefano Brivio <sbri...@redhat.com>
> ---
> hmp-commands.hx | 2 +-
> net/clients.h | 6 +
> net/dgram.c | 542 ++++++++++++++++++++++++++++++++++++++++++++++++
> net/hub.c | 2 +
> net/meson.build | 2 +
> net/net.c | 30 ++-
> net/stream.c | 423 +++++++++++++++++++++++++++++++++++++
> qapi/net.json | 63 +++++-
> qemu-options.hx | 12 ++
> 9 files changed, 1078 insertions(+), 4 deletions(-)
> create mode 100644 net/dgram.c
> create mode 100644 net/stream.c
>
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index 8ab8000acd9e..da40a7eb04ed 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -1276,7 +1276,7 @@ ERST
> {
> .name = "netdev_add",
> .args_type = "netdev:O",
> - .params = "[user|tap|socket|vde|bridge|hubport|netmap|vhost-user"
> + .params =
> "[user|tap|socket|stream|dgram|vde|bridge|hubport|netmap|vhost-user"
> #ifdef CONFIG_VMNET
> "|vmnet-host|vmnet-shared|vmnet-bridged"
> #endif
> diff --git a/net/clients.h b/net/clients.h
[...]
> diff --git a/qapi/net.json b/qapi/net.json
> index dd088c09c509..e02e8001a000 100644
> --- a/qapi/net.json
> +++ b/qapi/net.json
> @@ -7,6 +7,7 @@
> ##
>
> { 'include': 'common.json' }
> +{ 'include': 'sockets.json' }
>
> ##
> # @set_link:
> @@ -573,6 +574,61 @@
> '*isolated': 'bool' },
> 'if': 'CONFIG_VMNET' }
>
> +##
> +# @NetdevStreamOptions:
> +#
> +# Configuration info for stream socket netdev
> +#
> +# @addr: socket address to listen on (server=true)
> +# or connect to (server=false)
> +# @server: create server socket (default: true)
> +#
> +# Only SocketAddress types 'inet' and 'fd' are supported.
> +#
> +# Since: 7.1
> +##
> +{ 'struct': 'NetdevStreamOptions',
> + 'data': {
> + 'addr': 'SocketAddress',
> + '*server': 'bool' } }
> +
> +##
> +# @NetdevDgramOptions:
> +#
> +# Configuration info for datagram socket netdev.
> +#
> +# @remote: remote address
> +# @local: local address
> +#
> +# Only SocketAddress types 'inet' and 'fd' are supported.
> +#
> +# The code checks there is at least one of these options and reports an error
> +# if not.
Can we drop this sentence?
> If remote address is present and it's a multicast address, local
> +# address is optional. Otherwise local address is required and remote address
> +# is optional.
> +#
> +# .. table:: Valid parameters combination table
> +# :widths: auto
> +#
> +# ============= ======== =====
> +# remote local okay?
> +# ============= ======== =====
> +# absent absent no
> +# absent not fd no
> +# absent fd yes
> +# multicast absent yes
> +# multicast present yes
> +# not multicast absent no
> +# not multicast present yes
> +# ============= ======== =====
> +#
> +# Since: 7.1
> +##
My networking fu is not strong enough to suggest further improvements.
So let's go with what we have here.
> +{ 'struct': 'NetdevDgramOptions',
> + 'data': {
> + '*local': 'SocketAddress',
> + '*remote': 'SocketAddress' } }
> +
> ##
> # @NetClientDriver:
> #
> @@ -586,8 +642,9 @@
> # @vmnet-bridged since 7.1
> ##
> { 'enum': 'NetClientDriver',
> - 'data': [ 'none', 'nic', 'user', 'tap', 'l2tpv3', 'socket', 'vde',
> - 'bridge', 'hubport', 'netmap', 'vhost-user', 'vhost-vdpa',
> + 'data': [ 'none', 'nic', 'user', 'tap', 'l2tpv3', 'socket', 'stream',
> + 'dgram', 'vde', 'bridge', 'hubport', 'netmap', 'vhost-user',
> + 'vhost-vdpa',
> { 'name': 'vmnet-host', 'if': 'CONFIG_VMNET' },
> { 'name': 'vmnet-shared', 'if': 'CONFIG_VMNET' },
> { 'name': 'vmnet-bridged', 'if': 'CONFIG_VMNET' }] }
> @@ -617,6 +674,8 @@
> 'tap': 'NetdevTapOptions',
> 'l2tpv3': 'NetdevL2TPv3Options',
> 'socket': 'NetdevSocketOptions',
> + 'stream': 'NetdevStreamOptions',
> + 'dgram': 'NetdevDgramOptions',
> 'vde': 'NetdevVdeOptions',
> 'bridge': 'NetdevBridgeOptions',
> 'hubport': 'NetdevHubPortOptions',
> diff --git a/qemu-options.hx b/qemu-options.hx
> index d8b5ce5b4354..8c765f345da8 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -2734,6 +2734,18 @@ DEF("netdev", HAS_ARG, QEMU_OPTION_netdev,
> "-netdev socket,id=str[,fd=h][,udp=host:port][,localaddr=host:port]\n"
> " configure a network backend to connect to another
> network\n"
> " using an UDP tunnel\n"
> + "-netdev
> stream,id=str[,server=on|off],addr.type=inet,addr.host=host,addr.port=port\n"
> + "-netdev stream,id=str[,server=on|off],addr.type=fd,addr.str=h\n"
Not this patch's fault: using String for SocketAddress member @fd was a
mistake, because the resulting UI is bad: addr.str tells me nothing.
str.name would have been better. Commit 5be8c759f0 "qapi: add socket
address types" (v1.3.0).
Commit 1723d6b1cf "sockets: allow SocketAddress 'fd' to reference
numeric file descriptors" (v2.12.0) made it worse: it overloaded the
name so that decimal means numeric file descriptor. It should be an
alternate of string file descriptor name and int file descriptor number.
Except keyval_parse() killed that use of alternates (commit c0644771eb
"qapi: Reject alternates that can't work with keyval_parse()",
v2.10.0-rc0). Sigh, too complicated to have nice things.
Back to this patch. "addr.str=h" could perhaps be improved to
"=fd-name-or-number" or "=file-descriptor". Even "=fd" would be better,
I think.
> + " configure a network backend to connect to another
> network\n"
> + " using a socket connection in stream mode.\n"
> + "-netdev
> dgram,id=str,remote.type=inet,remote.host=maddr,remote.port=port[,local.type=inet,local.host=addr]\n"
> + "-netdev
> dgram,id=str,remote.type=inet,remote.host=maddr,remote.port=port[,local.type=fd,local.str=h]\n"
> + " configure a network backend to connect to a multicast
> maddr and port\n"
> + " use ``local.host=addr`` to specify the host address to
> send packets from\n"
> + "-netdev
> dgram,id=str,local.type=inet,local.host=addr,local.port=port[,remote.type=inet,remote.host=addr,remote.port=port]\n"
> + "-netdev dgram,id=str,local.type=fd,local.str=h\n"
> + " configure a network backend to connect to another
> network\n"
> + " using an UDP tunnel\n"
I should probably try to match these cases to the table in the QAPI
schema doc comment. But that would be like, uh, work.
> #ifdef CONFIG_VDE
> "-netdev
> vde,id=str[,sock=socketpath][,port=n][,group=groupname][,mode=octalmode]\n"
> " configure a network backend to connect to port 'n' of a
> vde switch\n"
QAPI schema
Acked-by: Markus Armbruster <arm...@redhat.com>
