virmacaddr: Track if MAC address is autogenerated

It will come handy to know if the MAC address was generated (e.g.
during XML parse) or if it was parsed since provided by user in
the XML.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NErik Skultety <eskultet@redhat.com>

src/util/virmacaddr.c

@@ -107,6 +107,7 @@ void
 virMacAddrSet(virMacAddrPtr dst, const virMacAddr *src)
 {
     memcpy(dst, src, sizeof(*src));
+    dst->generated = false;
 }
 
 /**
@@ -120,6 +121,7 @@ void
 virMacAddrSetRaw(virMacAddrPtr dst, const unsigned char src[VIR_MAC_BUFLEN])
 {
     memcpy(dst->addr, src, VIR_MAC_BUFLEN);
+    dst->generated = false;
 }
 
 /**
@@ -149,6 +151,7 @@ virMacAddrParse(const char* str, virMacAddrPtr addr)
 {
     size_t i;
 
+    addr->generated = false;
     errno = 0;
     for (i = 0; i < VIR_MAC_BUFLEN; i++) {
         char *end_ptr;
@@ -217,6 +220,7 @@ virMacAddrParseHex(const char *str, virMacAddrPtr addr)
         str[VIR_MAC_HEXLEN])
         return -1;
 
+    addr->generated = false;
     for (i = 0; i < VIR_MAC_BUFLEN; i++)
         addr->addr[i] = (virHexToBin(str[2 * i]) << 4 |
                          virHexToBin(str[2 * i + 1]));
@@ -232,6 +236,7 @@ void virMacAddrGenerate(const unsigned char prefix[VIR_MAC_PREFIX_BUFLEN],
     addr->addr[3] = virRandomBits(8);
     addr->addr[4] = virRandomBits(8);
     addr->addr[5] = virRandomBits(8);
+    addr->generated = true;
 }
 
 /* The low order bit of the first byte is the "multicast" bit. */

src/util/virmacaddr.h

@@ -36,6 +36,8 @@ typedef virMacAddr *virMacAddrPtr;
 
 struct _virMacAddr {
     unsigned char addr[VIR_MAC_BUFLEN];
+    bool generated; /* True if MAC address was autogenerated,
+                       false otherwise. */
 };
 
 int virMacAddrCompare(const char *mac1, const char *mac2);

tests/bhyveargv2xmlmock.c

@@ -16,6 +16,7 @@ virMacAddrGenerate(const unsigned char prefix[VIR_MAC_PREFIX_BUFLEN],
     addr->addr[3] = 0;
     addr->addr[4] = 0;
     addr->addr[5] = 0;
+    addr->generated = true;
 }
 
 int

tests/bhyvexml2argvmock.c

@@ -17,6 +17,7 @@ void virMacAddrGenerate(const unsigned char prefix[VIR_MAC_PREFIX_BUFLEN],
     addr->addr[3] = 0;
     addr->addr[4] = 0;
     addr->addr[5] = 0;
+    addr->generated = true;
 }
 
 int virNetDevTapCreateInBridgePort(const char *brname ATTRIBUTE_UNUSED,