10:12 a.m.
When we parse <mac address="00:00:00:00:00:00"/> we keep that in memory
and pass it down to the hypervisor. However, that MAC address is not
strictly valid as it is not marked as locally administered (bit 0x02)
but it is not even globally unique. It is also used for loopback device
on Linux, for example. And QEMU sees such MAC address just as "not
specified" and generates a new one that libvirt does not even know
about. So to make the overall experience better we now generate it if
the supplied one is all clear.
Resolves: https://issues.redhat.com/browse/RHEL-974
Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com>
---
src/conf/domain_conf.c | 2 +-
src/util/virmacaddr.c | 5 +++++
src/util/virmacaddr.h | 1 +
.../network-interface-mac-clear.xml | 21 +++++++++++++++++++
.../network-interface-mac-clear.xml | 21 +++++++++++++++++++
tests/genericxml2xmltest.c | 4 +++-
6 files changed, 52 insertions(+), 2 deletions(-)
create mode 100644 tests/genericxml2xmlindata/network-interface-mac-clear.xml
create mode 100644 tests/genericxml2xmloutdata/network-interface-mac-clear.xml
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index bb4f1fdb948d..652bd09b21b8 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -9675,7 +9675,7 @@ virDomainNetDefParseXML(virDomainXMLOption *xmlopt,
return NULL;
}
- if (!macaddr) {
+ if (!macaddr || virMacAddrIsAllClear(&def->mac)) {
virDomainNetGenerateMAC(xmlopt, &def->mac);
def->mac_generated = true;
}
diff --git a/src/util/virmacaddr.c b/src/util/virmacaddr.c
index 073f298b5b66..e06bb200fc68 100644
--- a/src/util/virmacaddr.c
+++ b/src/util/virmacaddr.c
@@ -246,6 +246,11 @@ virMacAddrIsBroadcastRaw(const unsigned char s[VIR_MAC_BUFLEN])
return memcmp(virMacAddrBroadcastAddrRaw, s, sizeof(*s)) == 0;
}
+bool virMacAddrIsAllClear(const virMacAddr *addr)
+{
+ return !virMacAddrCmpRaw(addr, (const unsigned char[VIR_MAC_BUFLEN]){0});
+}
+
void
virMacAddrFree(virMacAddr *addr)
{
diff --git a/src/util/virmacaddr.h b/src/util/virmacaddr.h
index f32b58805a61..7b9eb7443bd1 100644
--- a/src/util/virmacaddr.h
+++ b/src/util/virmacaddr.h
@@ -58,6 +58,7 @@ int virMacAddrParseHex(const char* str,
bool virMacAddrIsUnicast(const virMacAddr *addr);
bool virMacAddrIsMulticast(const virMacAddr *addr);
bool virMacAddrIsBroadcastRaw(const unsigned char s[VIR_MAC_BUFLEN]);
+bool virMacAddrIsAllClear(const virMacAddr *addr);
void virMacAddrFree(virMacAddr *addr);
G_DEFINE_AUTOPTR_CLEANUP_FUNC(virMacAddr, virMacAddrFree);
diff --git a/tests/genericxml2xmlindata/network-interface-mac-clear.xml
b/tests/genericxml2xmlindata/network-interface-mac-clear.xml
new file mode 100644
index 000000000000..41beda8a79bb
--- /dev/null
+++ b/tests/genericxml2xmlindata/network-interface-mac-clear.xml
@@ -0,0 +1,21 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='x86_64' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <interface type='bridge'>
+ <mac address='00:00:00:00:00:00'/>
+ <source bridge='br0'/>
+ </interface>
+ </devices>
+</domain>
diff --git a/tests/genericxml2xmloutdata/network-interface-mac-clear.xml
b/tests/genericxml2xmloutdata/network-interface-mac-clear.xml
new file mode 100644
index 000000000000..a7935fa9f4de
--- /dev/null
+++ b/tests/genericxml2xmloutdata/network-interface-mac-clear.xml
@@ -0,0 +1,21 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='x86_64' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <interface type='bridge'>
+ <mac address='52:54:00:00:00:00'/>
+ <source bridge='br0'/>
+ </interface>
+ </devices>
+</domain>
diff --git a/tests/genericxml2xmltest.c b/tests/genericxml2xmltest.c
index 3501eadf5597..bf160b7e0bef 100644
--- a/tests/genericxml2xmltest.c
+++ b/tests/genericxml2xmltest.c
@@ -187,6 +187,7 @@ mymain(void)
DO_TEST("cpu-cache-disable");
DO_TEST("network-interface-mac-check");
+ DO_TEST_DIFFERENT("network-interface-mac-clear");
DO_TEST_DIFFERENT("chardev-tcp");
DO_TEST_FAIL_ACTIVE("chardev-tcp-missing-host");
@@ -255,4 +256,5 @@ mymain(void)
return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
-VIR_TEST_MAIN(mymain)
+VIR_TEST_MAIN_PRELOAD(mymain,
+ VIR_TEST_MOCK("virrandom"))
--
2.42.0