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