File kvm-qemu-preXX-report-default-mac-used.patch of Package kvm.import4640
Index: qemu-kvm-0.14.0.rc0/net.c
===================================================================
--- qemu-kvm-0.14.0.rc0.orig/net.c
+++ qemu-kvm-0.14.0.rc0/net.c
@@ -173,6 +173,27 @@ void qemu_format_nic_info_str(VLANClient
macaddr[3], macaddr[4], macaddr[5]);
}
+static void default_mac_check(void)
+{
+ static const MACAddr def_mac = { .a = { 0x52,0x54,0x00,0x12,0x34,0x56 } };
+ static int warned = 0;
+ int i;
+
+ for (i = 0; i < MAX_NICS; i++)
+ {
+ if (!nd_table[i].used)
+ continue;
+ if (memcmp(nd_table[i].macaddr, def_mac.a, 5))
+ continue;
+ if (nd_table[i].macaddr[5] >= 0x56 &&
+ nd_table[i].macaddr[5] < 0x56 + MAX_NICS && !warned) {
+ warned = 1;
+ fprintf(stderr, "Warning: default mac address being used, creating "
+ "potential for address conflict\n");
+ }
+ }
+}
+
void qemu_macaddr_default_if_unset(MACAddr *macaddr)
{
static int index = 0;
@@ -1413,6 +1434,7 @@ int net_init_clients(void)
if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
return -1;
}
+ default_mac_check();
return 0;
}