aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorPaolo Bonzini <pbonzini@redhat.com>2013-03-22 17:57:48 +0100
committerAnthony Liguori <aliguori@us.ibm.com>2013-03-28 12:58:52 -0500
commit226ecabfbd410c7b2041385ea4b6f083a09ce8a2 (patch)
tree8ed5260ca789521d3118554261cc8efdaf338e87
parent2900af5969c8d54d48872cd707a4a0e71e6fa57e (diff)
qemu-bridge-helper: force usage of a very high MAC address for the bridge
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: qemu-stable@nongnu.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 1363971468-21154-1-git-send-email-pbonzini@redhat.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
-rw-r--r--qemu-bridge-helper.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/qemu-bridge-helper.c b/qemu-bridge-helper.c
index 287bfd5e38..6a0974eb48 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);