Commit 226ecabf authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Anthony Liguori

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: default avatarPaolo Bonzini <pbonzini@redhat.com>
Message-id: 1363971468-21154-1-git-send-email-pbonzini@redhat.com
Signed-off-by: default avatarAnthony Liguori <aliguori@us.ibm.com>
parent 2900af59
......@@ -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);
......
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