File NM-restore-MAC-on-release-only-when-cloned.patch of Package NetworkManager.19171

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File NM-restore-MAC-on-release-only-when-cloned.patch of Package NetworkManager.19171

From 190fd9aa9f3fbf5705c2b80b9fc64c89d22b7593 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
---
 src/devices/nm-device-bond.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

Index: NetworkManager-1.22.16/src/devices/nm-device-bond.c
===================================================================
--- NetworkManager-1.22.16.orig/src/devices/nm-device-bond.c
+++ NetworkManager-1.22.16/src/devices/nm-device-bond.c
@@ -413,6 +413,10 @@ release_slave (NMDevice *device,
 		/* 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) {
@@ -429,9 +433,16 @@ release_slave (NMDevice *device,
 			}
 		}
 
-		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

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File NM-restore-MAC-on-release-only-when-cloned.patch of Package NetworkManager.19171

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