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qemu-bridge-helper: force usage of a very high MAC address for the bridge

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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>
This commit is contained in:
Paolo Bonzini 2013-03-22 17:57:48 +01:00 committed by Anthony Liguori
parent 2900af5969
commit 226ecabfbd
1 changed files with 18 additions and 0 deletions
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18
qemu-bridge-helper.c
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@ -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);