From ccc66f603d5fac8748d2271d051bbd1c42eeb682 Mon Sep 17 00:00:00 2001
From: Beniamino Galvani <bgalvani@redhat.com>
Date: Sat, 6 Mar 2021 11:35:12 +0100
Subject: [PATCH] bond: restore MAC on release only when there is a cloned MAC
address
Currently we unconditionally reset the MAC to the previous value after
releasing ports. This has some disadvantages:
- by default, after the last port is removed the bond will have one
of the previous port's address, which could conflict with the port;
- in some cases, changing the bond MAC is not possible. For example
when the bond is active-backup and has fail_over_mac=1|2. In such
case the netlink call succeeds, but the address doesn't
change; then NM would keep waiting for some time.
Don't try to restore the MAC unless the bond connection has a cloned
MAC set.
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/775
(cherry picked from commit 190fd9aa9f3fbf5705c2b80b9fc64c89d22b7593)
(cherry picked from commit 4c1e60549a5be170185a77439379cc170d6b3631)
---
src/core/devices/nm-device-bond.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/src/core/devices/nm-device-bond.c b/src/core/devices/nm-device-bond.c
index 5814aef451..247ce41c07 100644
--- a/src/core/devices/nm-device-bond.c
+++ b/src/core/devices/nm-device-bond.c
@@ -444,9 +444,10 @@ release_slave(NMDevice *device, NMDevice *slave, gboolean configure)
_LOGD(LOGD_BOND, "bond slave %s is already released", nm_device_get_ip_iface(slave));
if (configure) {
- /* When the last slave is released the bond MAC will be set to a random
- * value by kernel; remember the current one and restore it afterwards.
- */
+ NMConnection * applied;
+ NMSettingWired *s_wired;
+ const char * cloned_mac;
+
address = g_strdup(nm_device_get_hw_address(device));
if (ifindex_slave > 0) {
@@ -461,9 +462,16 @@ release_slave(NMDevice *device, NMDevice *slave, gboolean configure)
}
}
- nm_platform_process_events(nm_device_get_platform(device));
- if (nm_device_update_hw_address(device))
- nm_device_hw_addr_set(device, address, "restore", FALSE);
+ if ((applied = nm_device_get_applied_connection(device))
+ && ((s_wired = nm_connection_get_setting_wired(applied)))
+ && ((cloned_mac = nm_setting_wired_get_cloned_mac_address(s_wired)))) {
+ /* When the last slave is released the bond MAC will be set to a random
+ * value by kernel; if we have set a cloned-mac-address, we need to
+ * restore it to the previous value. */
+ nm_platform_process_events(nm_device_get_platform(device));
+ if (nm_device_update_hw_address(device))
+ nm_device_hw_addr_set(device, address, "restore", FALSE);
+ }
/* Kernel bonding code "closes" the slave when releasing it, (which clears
* IFF_UP), so we must bring it back up here to ensure carrier changes and
--
2.29.2