device: merge branch 'th/device-ip-config-on-link-up-rh1309899'

https://bugzilla.redhat.com/show_bug.cgi?id=1309899

src/devices/nm-device.c

@@ -397,6 +397,9 @@ static gboolean nm_device_set_ip6_config (NMDevice *self,
                                           gboolean commit,
                                           gboolean routes_full_sync,
                                           NMDeviceStateReason *reason);
+static gboolean ip6_config_merge_and_apply (NMDevice *self,
+                                            gboolean commit,
+                                            NMDeviceStateReason *out_reason);
 
 static void nm_device_master_add_slave (NMDevice *self, NMDevice *slave, gboolean configure);
 static void nm_device_slave_notify_enslave (NMDevice *self, gboolean success);
@@ -1561,6 +1564,7 @@ device_link_changed (NMDevice *self)
 	NMPlatformLink info;
 	const NMPlatformLink *pllink;
 	int ifindex;
+	gboolean was_up;
 
 	priv->device_link_changed_id = 0;
 
@@ -1633,6 +1637,7 @@ device_link_changed (NMDevice *self)
 	if (ip_ifname_changed)
 		nm_device_update_dynamic_ip_setup (self);
 
+	was_up = priv->up;
 	priv->up = NM_FLAGS_HAS (info.n_ifi_flags, IFF_UP);
 
 	if (   info.initialized
@@ -1665,6 +1670,20 @@ device_link_changed (NMDevice *self)
 	set_unmanaged_external_down (self, FALSE);
 
 	device_recheck_slave_status (self, &info);
+
+	if (priv->up && !was_up) {
+		/* the link was down and just came up. That happens for example, while changing MTU.
+		 * We must restore IP configuration. */
+		if (priv->ip4_state == IP_DONE) {
+			if (!ip4_config_merge_and_apply (self, NULL, TRUE, NULL))
+				_LOGW (LOGD_IP4, "failed applying IP4 config after link comes up again");
+		}
+		if (priv->ip6_state == IP_DONE) {
+			if (!ip6_config_merge_and_apply (self, TRUE, NULL))
+				_LOGW (LOGD_IP6, "failed applying IP6 config after link comes up again");
+		}
+	}
+
 	return G_SOURCE_REMOVE;
 }
 
@@ -8063,6 +8082,9 @@ nm_device_set_ip4_config (NMDevice *self,
 
 	g_return_val_if_fail (NM_IS_DEVICE (self), FALSE);
 
+	_LOGD (LOGD_IP4, "ip4-config: update (commit=%d, routes-full-sync=%d, new-config=%p)",
+	       commit, routes_full_sync, new_config);
+
 	priv = NM_DEVICE_GET_PRIVATE (self);
 	ip_ifindex = nm_device_get_ip_ifindex (self);
 
@@ -8096,7 +8118,7 @@ nm_device_set_ip4_config (NMDevice *self,
 			 * this causes a re-read and reset. This should only happen for relevant changes */
 			nm_ip4_config_replace (old_config, new_config, &has_changes);
 			if (has_changes) {
-				_LOGD (LOGD_IP4, "update IP4Config instance (%s)",
+				_LOGD (LOGD_IP4, "ip4-config: update IP4Config instance (%s)",
 				       nm_exported_object_get_path (NM_EXPORTED_OBJECT (old_config)));
 			}
 		} else {
@@ -8106,13 +8128,13 @@ nm_device_set_ip4_config (NMDevice *self,
 			if (success && !nm_exported_object_is_exported (NM_EXPORTED_OBJECT (new_config)))
 				nm_exported_object_export (NM_EXPORTED_OBJECT (new_config));
 
-			_LOGD (LOGD_IP4, "set IP4Config instance (%s)",
+			_LOGD (LOGD_IP4, "ip4-config: set IP4Config instance (%s)",
 			       nm_exported_object_get_path (NM_EXPORTED_OBJECT (new_config)));
 		}
 	} else if (old_config) {
 		has_changes = TRUE;
 		priv->ip4_config = NULL;
-		_LOGD (LOGD_IP4, "clear IP4Config instance (%s)",
+		_LOGD (LOGD_IP4, "ip4-config: clear IP4Config instance (%s)",
 		       nm_exported_object_get_path (NM_EXPORTED_OBJECT (old_config)));
 		/* Device config is invalid if combined config is invalid */
 		g_clear_object (&priv->dev_ip4_config);
@@ -8231,6 +8253,9 @@ nm_device_set_ip6_config (NMDevice *self,
 
 	g_return_val_if_fail (NM_IS_DEVICE (self), FALSE);
 
+	_LOGD (LOGD_IP6, "ip6-config: update (commit=%d, routes-full-sync=%d, new-config=%p)",
+	       commit, routes_full_sync, new_config);
+
 	priv = NM_DEVICE_GET_PRIVATE (self);
 	ip_ifindex = nm_device_get_ip_ifindex (self);
 
@@ -8258,7 +8283,7 @@ nm_device_set_ip6_config (NMDevice *self,
 			 * this causes a re-read and reset. This should only happen for relevant changes */
 			nm_ip6_config_replace (old_config, new_config, &has_changes);
 			if (has_changes) {
-				_LOGD (LOGD_IP6, "update IP6Config instance (%s)",
+				_LOGD (LOGD_IP6, "ip6-config: update IP6Config instance (%s)",
 				       nm_exported_object_get_path (NM_EXPORTED_OBJECT (old_config)));
 			}
 		} else {
@@ -8268,13 +8293,13 @@ nm_device_set_ip6_config (NMDevice *self,
 			if (success && !nm_exported_object_is_exported (NM_EXPORTED_OBJECT (new_config)))
 				nm_exported_object_export (NM_EXPORTED_OBJECT (new_config));
 
-			_LOGD (LOGD_IP6, "set IP6Config instance (%s)",
+			_LOGD (LOGD_IP6, "ip6-config: set IP6Config instance (%s)",
 			       nm_exported_object_get_path (NM_EXPORTED_OBJECT (new_config)));
 		}
 	} else if (old_config) {
 		has_changes = TRUE;
 		priv->ip6_config = NULL;
-		_LOGD (LOGD_IP6, "clear IP6Config instance (%s)",
+		_LOGD (LOGD_IP6, "ip6-config: clear IP6Config instance (%s)",
 		       nm_exported_object_get_path (NM_EXPORTED_OBJECT (old_config)));
 	}
 

src/platform/nm-linux-platform.c

@@ -3301,9 +3301,14 @@ cache_pre_hook (NMPCache *cache, const NMPObject *old, const NMPObject *new, NMP
 			if (   ops_type == NMP_CACHE_OPS_UPDATED
 			    && old && new /* <-- nonsensical, make coverity happy */
 			    && old->_link.netlink.is_in_netlink
-			    && NM_FLAGS_HAS (old->link.n_ifi_flags, IFF_LOWER_UP)
 			    && new->_link.netlink.is_in_netlink
-			    && !NM_FLAGS_HAS (new->link.n_ifi_flags, IFF_LOWER_UP)) {
+			    && (   (   NM_FLAGS_HAS (old->link.n_ifi_flags, IFF_UP)
+			            && !NM_FLAGS_HAS (new->link.n_ifi_flags, IFF_UP))
+			        || (   NM_FLAGS_HAS (old->link.n_ifi_flags, IFF_LOWER_UP)
+			            && !NM_FLAGS_HAS (new->link.n_ifi_flags, IFF_LOWER_UP)))) {
+				/* FIXME: I suspect that IFF_LOWER_UP must not be considered, and I
+				 * think kernel does send RTM_DELROUTE events for IPv6 routes, so
+				 * we might not need to refresh IPv6 routes. */
 				delayed_action_schedule (platform,
 				                         DELAYED_ACTION_TYPE_REFRESH_ALL_IP4_ROUTES |
 				                         DELAYED_ACTION_TYPE_REFRESH_ALL_IP6_ROUTES,