[Qemu-devel] [PATCH 23/37] qemu-bridge-helper: force usage of a very high MAC address for the bridge

[Michael Roth]

From: Paolo Bonzini <address@hidden>

Linux uses the lowest enslaved MAC address as the MAC address of
the bridge.  Set MAC address to a high value so that it does not
affect the MAC address of the bridge.

Changing the MAC address of the bridge could cause a few seconds
of network downtime.

Cc: address@hidden
Signed-off-by: Paolo Bonzini <address@hidden>
Message-id: address@hidden
Signed-off-by: Anthony Liguori <address@hidden>
(cherry picked from commit 226ecabfbd410c7b2041385ea4b6f083a09ce8a2)

Signed-off-by: Michael Roth <address@hidden>
---
 qemu-bridge-helper.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/qemu-bridge-helper.c b/qemu-bridge-helper.c
index 287bfd5..6a0974e 100644
--- a/qemu-bridge-helper.c
+++ b/qemu-bridge-helper.c
@@ -367,6 +367,24 @@ int main(int argc, char **argv)
         goto cleanup;
     }
 
+    /* Linux uses the lowest enslaved MAC address as the MAC address of
+     * the bridge.  Set MAC address to a high value so that it doesn't
+     * affect the MAC address of the bridge.
+     */
+    if (ioctl(ctlfd, SIOCGIFHWADDR, &ifr) < 0) {
+        fprintf(stderr, "failed to get MAC address of device `%s': %s\n",
+                iface, strerror(errno));
+        ret = EXIT_FAILURE;
+        goto cleanup;
+    }
+    ifr.ifr_hwaddr.sa_data[0] = 0xFE;
+    if (ioctl(ctlfd, SIOCSIFHWADDR, &ifr) < 0) {
+        fprintf(stderr, "failed to set MAC address of device `%s': %s\n",
+                iface, strerror(errno));
+        ret = EXIT_FAILURE;
+        goto cleanup;
+    }
+
     /* add the interface to the bridge */
     prep_ifreq(&ifr, bridge);
     ifindex = if_nametoindex(iface);
-- 
1.7.9.5