[libvirt] [PATCH 1/3] bridge_driver: Return the live state info of a given virtual network
Lin Ma
lma at suse.com
Mon Feb 2 14:08:21 UTC 2015
It constructs a temporary static config of the network, Obtains all of
attached interfaces information through netcf, Then removes the config.
Signed-off-by: Lin Ma <lma at suse.com>
---
include/libvirt/libvirt-network.h | 1 +
src/Makefile.am | 3 +
src/network/bridge_driver.c | 141 ++++++++++++++++++++++++++++++++++-
src/network/bridge_driver_platform.h | 7 ++
tests/Makefile.am | 4 +
5 files changed, 155 insertions(+), 1 deletion(-)
diff --git a/include/libvirt/libvirt-network.h b/include/libvirt/libvirt-network.h
index 308f27f..9b09546 100644
--- a/include/libvirt/libvirt-network.h
+++ b/include/libvirt/libvirt-network.h
@@ -30,6 +30,7 @@
typedef enum {
VIR_NETWORK_XML_INACTIVE = (1 << 0), /* dump inactive network information */
+ VIR_NETWORK_XML_IFACE_ATTACHED = (1 << 1), /* dump current live state */
} virNetworkXMLFlags;
/**
diff --git a/src/Makefile.am b/src/Makefile.am
index b41c6d4..d22ae7e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1412,6 +1412,9 @@ if WITH_NETWORK
noinst_LTLIBRARIES += libvirt_driver_network_impl.la
libvirt_driver_network_la_SOURCES =
libvirt_driver_network_la_LIBADD = libvirt_driver_network_impl.la
+if WITH_NETCF
+libvirt_driver_network_la_LIBADD += $(NETCF_LIBS)
+endif WITH_NETCF
if WITH_DRIVER_MODULES
mod_LTLIBRARIES += libvirt_driver_network.la
libvirt_driver_network_la_LIBADD += ../gnulib/lib/libgnu.la \
diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index c56e8f2..1e49e2e 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -3333,8 +3333,17 @@ static char *networkGetXMLDesc(virNetworkPtr net,
virNetworkObjPtr network;
virNetworkDefPtr def;
char *ret = NULL;
+#ifdef WITH_NETCF
+ struct netcf_if *iface = NULL;
+ char *bridge = NULL;
+ char *if_xml_tmp = NULL;
+ xmlDocPtr xml = NULL;
+ xmlXPathContextPtr ctxt = NULL;
+ xmlXPathObjectPtr obj = NULL;
+#endif
- virCheckFlags(VIR_NETWORK_XML_INACTIVE, NULL);
+ virCheckFlags(VIR_NETWORK_XML_INACTIVE |
+ VIR_NETWORK_XML_IFACE_ATTACHED, NULL);
if (!(network = networkObjFromNetwork(net)))
return ret;
@@ -3342,6 +3351,135 @@ static char *networkGetXMLDesc(virNetworkPtr net,
if (virNetworkGetXMLDescEnsureACL(net->conn, network->def) < 0)
goto cleanup;
+#ifdef WITH_NETCF
+ if ((flags & VIR_NETWORK_XML_INACTIVE) && network->newDef) {
+ def = network->newDef;
+ ret = virNetworkDefFormat(def, flags);
+ }
+ else if (flags & VIR_NETWORK_XML_IFACE_ATTACHED) {
+ if (!(network->def->bridge)) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("network '%s' does not have a bridge name."),
+ network->def->name);
+ goto cleanup;
+ }
+ ignore_value(VIR_STRDUP(bridge, network->def->bridge));
+
+ if (virAsprintf(&if_xml_tmp,
+ "<interface type='bridge' name='%s'>"
+ "<start mode='none'/><bridge/></interface>",
+ bridge) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("failed to generate temp xml for network"));
+ goto cleanup;
+ }
+
+ if (ncf_init(&driver->netcf, NULL) != 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("failed to init netcf"));
+ goto cleanup;
+ }
+
+ // create a temp bridge configuration file
+ iface = ncf_define(driver->netcf, if_xml_tmp);
+ if (!iface) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("failed to define the temp bridge %s"), bridge);
+ ncf_close(driver->netcf);
+ goto cleanup;
+ }
+
+ ret = ncf_if_xml_state(iface);
+ if (!ret) {
+ virReportError(VIR_ERR_XML_ERROR, "%s",
+ _("could not get bridge XML description"));
+ ncf_if_free(iface);
+ ncf_close(driver->netcf);
+ goto cleanup;
+ }
+
+ // remove the temp bridge configuration file
+ if (ncf_if_undefine(iface) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("failed to undefine the temp bridge %s"), bridge);
+ ncf_if_free(iface);
+ ncf_close(driver->netcf);
+ ret = NULL;
+ goto cleanup;
+ }
+ ncf_if_free(iface);
+ ncf_close(driver->netcf);
+
+ // remove the dummp tap interface section from the result
+ if (network->def->mac_specified) {
+ char *macTapIfName = networkBridgeDummyNicName(network->def->bridge);
+ if (macTapIfName) {
+ char mac[VIR_MAC_STRING_BUFLEN];
+ xmlNodePtr cur = NULL, matchNode = NULL;
+ xmlChar *br_xml = NULL;
+ int br_xml_size;
+ char buf[64];
+ size_t i;
+ int diff_mac;
+ virMacAddrFormat(&network->def->mac, mac);
+ snprintf(buf, sizeof(buf), "./bridge/interface[@name='%s']",
+ macTapIfName);
+ if (!(xml = virXMLParseStringCtxt(ret,
+ _("(bridge interface "
+ "definition)"), &ctxt))) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ ("Failed to parse network configuration"));
+ VIR_FREE(macTapIfName);
+ ret = NULL;
+ goto cleanup;
+ }
+ obj = xmlXPathEval(BAD_CAST buf, ctxt);
+ if (obj == NULL || obj->type != XPATH_NODESET ||
+ obj->nodesetval == NULL || obj->nodesetval->nodeNr == 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("No interface found whose name is %s"),
+ macTapIfName);
+ VIR_FREE(macTapIfName);
+ ret = NULL;
+ goto cleanup;
+ }
+ VIR_FREE(macTapIfName);
+ for (i = 0; i < obj->nodesetval->nodeNr; i++) {
+ cur = obj->nodesetval->nodeTab[i]->children;
+ while (cur != NULL) {
+ if (cur->type == XML_ELEMENT_NODE &&
+ xmlStrEqual(cur->name, BAD_CAST "mac")) {
+ char *tmp_mac = virXMLPropString(cur, "address");
+ diff_mac = virMacAddrCompare(tmp_mac, mac);
+ VIR_FREE(tmp_mac);
+ if (!diff_mac) {
+ matchNode = obj->nodesetval->nodeTab[i];
+ xmlUnlinkNode(matchNode);
+ break;
+ }
+ }
+ cur = cur->next;
+ }
+ }
+ xmlDocDumpMemory(xml, &br_xml, &br_xml_size);
+ ret = (char *)br_xml;
+ }
+ }
+ }
+ else {
+ def = network->def;
+ ret = virNetworkDefFormat(def, flags);
+ }
+
+ cleanup:
+ xmlXPathFreeObject(obj);
+ xmlXPathFreeContext(ctxt);
+ xmlFreeDoc(xml);
+ VIR_FREE(if_xml_tmp);
+ VIR_FREE(bridge);
+ if (network)
+ virNetworkObjUnlock(network);
+#else
if ((flags & VIR_NETWORK_XML_INACTIVE) && network->newDef)
def = network->newDef;
else
@@ -3352,6 +3490,7 @@ static char *networkGetXMLDesc(virNetworkPtr net,
cleanup:
if (network)
virNetworkObjUnlock(network);
+#endif
return ret;
}
diff --git a/src/network/bridge_driver_platform.h b/src/network/bridge_driver_platform.h
index 1e8264a..43ea1c3 100644
--- a/src/network/bridge_driver_platform.h
+++ b/src/network/bridge_driver_platform.h
@@ -24,6 +24,9 @@
#ifndef __VIR_BRIDGE_DRIVER_PLATFORM_H__
# define __VIR_BRIDGE_DRIVER_PLATFORM_H__
+#ifdef WITH_NETCF
+# include <netcf.h>
+#endif
# include "internal.h"
# include "virthread.h"
# include "virdnsmasq.h"
@@ -34,6 +37,10 @@
struct _virNetworkDriverState {
virMutex lock;
+#ifdef WITH_NETCF
+ struct netcf *netcf;
+#endif
+
virNetworkObjList networks;
char *networkConfigDir;
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 938270c..0662337 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -67,6 +67,10 @@ LDADDS = \
$(GNULIB_LIBS) \
../src/libvirt.la
+if WITH_NETCF
+LDADDS += $(NETCF_LIBS)
+endif WITH_NETCF
+
EXTRA_DIST = \
bhyvexml2argvdata \
bhyvexml2xmloutdata \
--
1.8.4
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