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passt/contrib/libvirt/0001-conf-Introduce-support-for-UNIX-domain-socket-as-qem.patch
Stefano Brivio 27050b094f libvirt, qemu: Move patches to new directory, contrib 
I'm about to add a new adaptation carrying out-of-tree patches
for a Kata Containers PoC -- move the existing out-of-tree patches
to their own directory to keep things easy to find in the main one.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2022-01-28 18:51:50 +01:00

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From 7afbbab2ccada16c87e1095e85184bb21c028012 Mon Sep 17 00:00:00 2001
Message-Id: <7afbbab2ccada16c87e1095e85184bb21c028012.1619091487.git.sbrivio@redhat.com>
From: Stefano Brivio <sbrivio@redhat.com>
Date: Wed, 21 Apr 2021 19:29:31 +0200
Subject: [PATCH] conf: Introduce support for UNIX domain socket as qemu netdev
back-end
Since qemu [TODO], named UNIX domain sockets can be used instead of
TCP to establish a virtual network between VMs.
The obvious difference compared with TCP is that we need pass a path
instead of address and port.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
---
SPDX-FileCopyrightText: 2020-2021 Red Hat GmbH <sbrivio@redhat.com>
SPDX-License-Identifier: AGPL-3.0-or-later
docs/formatdomain.rst | 41 +++++++++++++++++++------
docs/schemas/domaincommon.rng | 50 +++++++++++++++++++++++-------
src/conf/domain_conf.c | 58 +++++++++++++++++++++++++++--------
src/conf/domain_conf.h | 13 +++++---
src/qemu/qemu_command.c | 46 ++++++++++++++++++---------
src/qemu/qemu_hotplug.c | 8 +++--
6 files changed, 160 insertions(+), 56 deletions(-)
diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst
index 1b9b2216111c..87c3c956fa23 100644
--- a/docs/formatdomain.rst
+++ b/docs/formatdomain.rst
@@ -5010,18 +5010,20 @@ must be from the multicast address block.
</devices>
...
-:anchor:`<a id="elementsNICSTCP"/>`
+:anchor:`<a id="elementsNICSStream"/>`
-TCP tunnel
-^^^^^^^^^^
+TCP or UNIX domain socket tunnel
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+A stream-oriented client/server architecture provides a virtual network. One VM
+provides the server end of the network, all other VMS are configured as clients.
+All network traffic is routed between the VMs via the server. This mode is also
+available to unprivileged users. There is no default DNS or DHCP support and no
+outgoing network access. To provide outgoing network access, one of the VMs
+should have a 2nd NIC which is connected to one of the first 4 network types and
+do the appropriate routing.
-A TCP client/server architecture provides a virtual network. One VM provides the
-server end of the network, all other VMS are configured as clients. All network
-traffic is routed between the VMs via the server. This mode is also available to
-unprivileged users. There is no default DNS or DHCP support and no outgoing
-network access. To provide outgoing network access, one of the VMs should have a
-2nd NIC which is connected to one of the first 4 network types and do the
-appropriate routing.
+TCP endpoints can be specified as follows:
::
@@ -5039,6 +5041,25 @@ appropriate routing.
</devices>
...
+Named UNIX domain sockets can be specified as follows:
+:since:`Since 7.3.0, qemu`
+
+::
+
+ ...
+ <devices>
+ <interface type='server'>
+ <mac address='52:54:00:22:c9:42'/>
+ <source path='/tmp/qemu.socket'/>
+ </interface>
+ ...
+ <interface type='client'>
+ <mac address='52:54:00:8b:c9:51'/>
+ <source path='/tmp/qemu.socket'/>
+ </interface>
+ </devices>
+ ...
+
:anchor:`<a id="elementsNICSUDP"/>`
UDP unicast tunnel
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index a2e5c50c1d77..7c0a90ba199b 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -3161,10 +3161,7 @@
</group>
<group>
<attribute name="type">
- <choice>
- <value>mcast</value>
- <value>client</value>
- </choice>
+ <value>mcast</value>
</attribute>
<interleave>
<element name="source">
@@ -3179,6 +3176,30 @@
<ref name="interface-options"/>
</interleave>
</group>
+ <group>
+ <attribute name="type">
+ <value>client</value>
+ </attribute>
+ <interleave>
+ <element name="source">
+ <choice>
+ <group>
+ <attribute name="address">
+ <ref name="ipv4Addr"/>
+ </attribute>
+ <attribute name="port">
+ <ref name="PortNumber"/>
+ </attribute>
+ </group>
+ <attribute name="path">
+ <ref name="absFilePath"/>
+ </attribute>
+ </choice>
+ <empty/>
+ </element>
+ <ref name="interface-options"/>
+ </interleave>
+ </group>
<group>
<attribute name="type">
<value>udp</value>
@@ -3210,14 +3231,21 @@
</attribute>
<interleave>
<element name="source">
- <optional>
- <attribute name="address">
- <ref name="ipv4Addr"/>
+ <choice>
+ <group>
+ <optional>
+ <attribute name="address">
+ <ref name="ipv4Addr"/>
+ </attribute>
+ </optional>
+ <attribute name="port">
+ <ref name="PortNumber"/>
+ </attribute>
+ </group>
+ <attribute name="path">
+ <ref name="absFilePath"/>
</attribute>
- </optional>
- <attribute name="port">
- <ref name="PortNumber"/>
- </attribute>
+ </choice>
<empty/>
</element>
<ref name="interface-options"/>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index f8a462fb3b99..8c6a5d4f974e 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -2562,8 +2562,9 @@ virDomainNetDefFree(virDomainNetDef *def)
case VIR_DOMAIN_NET_TYPE_CLIENT:
case VIR_DOMAIN_NET_TYPE_MCAST:
case VIR_DOMAIN_NET_TYPE_UDP:
- g_free(def->data.socket.address);
- g_free(def->data.socket.localaddr);
+ g_free(def->data.socket.net.address);
+ g_free(def->data.socket.net.localaddr);
+ g_free(def->data.socket.path);
break;
case VIR_DOMAIN_NET_TYPE_NETWORK:
@@ -10555,6 +10556,7 @@ virDomainNetDefParseXML(virDomainXMLOption *xmlopt,
g_autofree char *downscript = NULL;
g_autofree char *address = NULL;
g_autofree char *port = NULL;
+ g_autofree char *path = NULL;
g_autofree char *localaddr = NULL;
g_autofree char *localport = NULL;
g_autofree char *model = NULL;
@@ -10699,7 +10701,7 @@ virDomainNetDefParseXML(virDomainXMLOption *xmlopt,
" <interface type='%s'>"), type);
goto error;
}
- } else if (!address &&
+ } else if (!address && !path &&
(def->type == VIR_DOMAIN_NET_TYPE_SERVER ||
def->type == VIR_DOMAIN_NET_TYPE_CLIENT ||
def->type == VIR_DOMAIN_NET_TYPE_MCAST ||
@@ -10707,6 +10709,7 @@ virDomainNetDefParseXML(virDomainXMLOption *xmlopt,
virXMLNodeNameEqual(cur, "source")) {
address = virXMLPropString(cur, "address");
port = virXMLPropString(cur, "port");
+ path = virXMLPropString(cur, "path");
if (!localaddr && def->type == VIR_DOMAIN_NET_TYPE_UDP) {
xmlNodePtr tmpnode = ctxt->node;
ctxt->node = cur;
@@ -10950,6 +10953,27 @@ virDomainNetDefParseXML(virDomainXMLOption *xmlopt,
case VIR_DOMAIN_NET_TYPE_CLIENT:
case VIR_DOMAIN_NET_TYPE_SERVER:
+ if (path != NULL) {
+ if (port != NULL || address != NULL ||
+ localport != NULL || localaddr != NULL) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("<source> 'path' attribute "
+ "for socket interface cannot be specified "
+ "together with other attributes"));
+ goto error;
+ }
+ def->data.socket.path = g_steal_pointer(&path);
+ break;
+ }
+
+ if (port == NULL) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Neither <source> 'port' nor 'path' attribute "
+ "specified with socket interface"));
+ goto error;
+ }
+
+ G_GNUC_FALLTHROUGH;
case VIR_DOMAIN_NET_TYPE_MCAST:
case VIR_DOMAIN_NET_TYPE_UDP:
if (port == NULL) {
@@ -10958,7 +10982,7 @@ virDomainNetDefParseXML(virDomainXMLOption *xmlopt,
"specified with socket interface"));
goto error;
}
- if (virStrToLong_i(port, NULL, 10, &def->data.socket.port) < 0) {
+ if (virStrToLong_i(port, NULL, 10, &def->data.socket.net.port) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Cannot parse <source> 'port' attribute "
"with socket interface"));
@@ -10975,7 +10999,7 @@ virDomainNetDefParseXML(virDomainXMLOption *xmlopt,
goto error;
}
} else {
- def->data.socket.address = g_steal_pointer(&address);
+ def->data.socket.net.address = g_steal_pointer(&address);
}
if (def->type != VIR_DOMAIN_NET_TYPE_UDP)
@@ -10987,7 +11011,8 @@ virDomainNetDefParseXML(virDomainXMLOption *xmlopt,
"specified with socket interface"));
goto error;
}
- if (virStrToLong_i(localport, NULL, 10, &def->data.socket.localport) < 0) {
+ if (virStrToLong_i(localport, NULL, 10,
+ &def->data.socket.net.localport) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Cannot parse <local> 'port' attribute "
"with socket interface"));
@@ -11000,7 +11025,7 @@ virDomainNetDefParseXML(virDomainXMLOption *xmlopt,
"specified with socket interface"));
goto error;
} else {
- def->data.socket.localaddr = g_steal_pointer(&localaddr);
+ def->data.socket.net.localaddr = g_steal_pointer(&localaddr);
}
break;
@@ -25940,15 +25965,22 @@ virDomainNetDefFormat(virBuffer *buf,
case VIR_DOMAIN_NET_TYPE_SERVER:
case VIR_DOMAIN_NET_TYPE_CLIENT:
+ if (def->data.socket.path) {
+ virBufferAsprintf(buf, "<source path='%s'",
+ def->data.socket.path);
+ sourceLines++;
+ break;
+ }
+ G_GNUC_FALLTHROUGH;
case VIR_DOMAIN_NET_TYPE_MCAST:
case VIR_DOMAIN_NET_TYPE_UDP:
- if (def->data.socket.address) {
+ if (def->data.socket.net.address) {
virBufferAsprintf(buf, "<source address='%s' port='%d'",
- def->data.socket.address,
- def->data.socket.port);
+ def->data.socket.net.address,
+ def->data.socket.net.port);
} else {
virBufferAsprintf(buf, "<source port='%d'",
- def->data.socket.port);
+ def->data.socket.net.port);
}
sourceLines++;
@@ -25960,8 +25992,8 @@ virDomainNetDefFormat(virBuffer *buf,
virBufferAdjustIndent(buf, 2);
virBufferAsprintf(buf, "<local address='%s' port='%d'/>\n",
- def->data.socket.localaddr,
- def->data.socket.localport);
+ def->data.socket.net.localaddr,
+ def->data.socket.net.localport);
virBufferAdjustIndent(buf, -2);
break;
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 7688f17b18cd..054b08330c8c 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1055,11 +1055,14 @@ struct _virDomainNetDef {
virDomainNetTeamingInfo *teaming;
union {
virDomainChrSourceDef *vhostuser;
- struct {
- char *address;
- int port;
- char *localaddr;
- int localport;
+ union {
+ struct {
+ char *address;
+ int port;
+ char *localaddr;
+ int localport;
+ } net;
+ char *path;
} socket; /* any of NET_CLIENT or NET_SERVER or NET_MCAST */
struct {
char *name;
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 2ceff155124e..dbef58f37879 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3713,37 +3713,55 @@ qemuBuildHostNetStr(virDomainNetDef *net,
break;
case VIR_DOMAIN_NET_TYPE_CLIENT:
- if (virJSONValueObjectCreate(&netprops, "s:type", "socket", NULL) < 0 ||
- virJSONValueObjectAppendStringPrintf(netprops, "connect", "%s:%d",
- net->data.socket.address,
- net->data.socket.port) < 0)
+ if (virJSONValueObjectCreate(&netprops, "s:type", "socket", NULL) < 0)
+ return NULL;
+
+ if (net->data.socket.path != NULL) {
+ if (virJSONValueObjectAppendStringPrintf(netprops, "connect", "%s",
+ net->data.socket.path) < 0)
+ return NULL;
+ break;
+ }
+
+ if (virJSONValueObjectAppendStringPrintf(netprops, "connect", "%s:%d",
+ net->data.socket.net.address,
+ net->data.socket.net.port) < 0)
return NULL;
break;
case VIR_DOMAIN_NET_TYPE_SERVER:
- if (virJSONValueObjectCreate(&netprops, "s:type", "socket", NULL) < 0 ||
- virJSONValueObjectAppendStringPrintf(netprops, "listen", "%s:%d",
- NULLSTR_EMPTY(net->data.socket.address),
- net->data.socket.port) < 0)
+ if (virJSONValueObjectCreate(&netprops, "s:type", "socket", NULL) < 0)
+ return NULL;
+
+ if (net->data.socket.path != NULL) {
+ if (virJSONValueObjectAppendStringPrintf(netprops, "listen", "%s",
+ net->data.socket.path) < 0)
+ return NULL;
+ break;
+ }
+
+ if (virJSONValueObjectAppendStringPrintf(netprops, "listen", "%s:%d",
+ NULLSTR_EMPTY(net->data.socket.net.address),
+ net->data.socket.net.port) < 0)
return NULL;
break;
case VIR_DOMAIN_NET_TYPE_MCAST:
if (virJSONValueObjectCreate(&netprops, "s:type", "socket", NULL) < 0 ||
virJSONValueObjectAppendStringPrintf(netprops, "mcast", "%s:%d",
- net->data.socket.address,
- net->data.socket.port) < 0)
+ net->data.socket.net.address,
+ net->data.socket.net.port) < 0)
return NULL;
break;
case VIR_DOMAIN_NET_TYPE_UDP:
if (virJSONValueObjectCreate(&netprops, "s:type", "socket", NULL) < 0 ||
virJSONValueObjectAppendStringPrintf(netprops, "udp", "%s:%d",
- net->data.socket.address,
- net->data.socket.port) < 0 ||
+ net->data.socket.net.address,
+ net->data.socket.net.port) < 0 ||
virJSONValueObjectAppendStringPrintf(netprops, "localaddr", "%s:%d",
- net->data.socket.localaddr,
- net->data.socket.localport) < 0)
+ net->data.socket.net.localaddr,
+ net->data.socket.net.localport) < 0)
return NULL;
break;
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 4344edc75b80..69ef7abd0ee2 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -3741,9 +3741,11 @@ qemuDomainChangeNet(virQEMUDriver *driver,
case VIR_DOMAIN_NET_TYPE_CLIENT:
case VIR_DOMAIN_NET_TYPE_MCAST:
case VIR_DOMAIN_NET_TYPE_UDP:
- if (STRNEQ_NULLABLE(olddev->data.socket.address,
- newdev->data.socket.address) ||
- olddev->data.socket.port != newdev->data.socket.port) {
+ if (STRNEQ_NULLABLE(olddev->data.socket.path,
+ newdev->data.socket.path) ||
+ STRNEQ_NULLABLE(olddev->data.socket.net.address,
+ newdev->data.socket.net.address) ||
+ olddev->data.socket.net.port != newdev->data.socket.net.port) {
needReconnect = true;
}
break;
--
2.29.2
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