core: support renaming of NMDevice (changes of ifname)

https://bugzilla.gnome.org/show_bug.cgi?id=726177
https://bugzilla.redhat.com/show_bug.cgi?id=907836

Signed-off-by: Thomas Haller <thaller@redhat.com>

src/devices/nm-device-private.h

@@ -79,6 +79,7 @@ void nm_device_set_dhcp_timeout (NMDevice *device, guint32 timeout);
 void nm_device_set_dhcp_anycast_address (NMDevice *device, guint8 *addr);
 
 gboolean nm_device_dhcp4_renew (NMDevice *device, gboolean release);
+gboolean nm_device_dhcp6_renew (NMDevice *device, gboolean release);
 
 void nm_device_recheck_available_connections (NMDevice *device);
 

src/devices/nm-device.c

@@ -339,6 +339,7 @@ static gboolean spec_match_list (NMDevice *device, const GSList *specs);
 static void _clear_available_connections (NMDevice *device, gboolean do_signal);
 
 static void dhcp4_cleanup (NMDevice *self, gboolean stop, gboolean release);
+static void dhcp6_cleanup (NMDevice *self, gboolean stop, gboolean release);
 
 static const char *reason_to_string (NMDeviceStateReason reason);
 
@@ -1121,10 +1122,11 @@ link_changed_cb (NMPlatform *platform, int ifindex, NMPlatformLink *info, NMPlat
 {
 	NMDeviceClass *klass = NM_DEVICE_GET_CLASS (device);
 	NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE (device);
+	int my_ifindex = nm_device_get_ifindex (device);
+	gboolean change_ip_ifname = FALSE;
 
 	/* Ignore other devices. */
-	if (ifindex != nm_device_get_ifindex (device))
+	if (ifindex == my_ifindex) {
-		return;
 
 		/* We don't filter by 'reason' because we are interested in *all* link
 		 * changes. For example a call to nm_platform_link_set_up() may result
@@ -1145,8 +1147,71 @@ link_changed_cb (NMPlatform *platform, int ifindex, NMPlatformLink *info, NMPlat
 			g_object_notify (G_OBJECT (device), NM_DEVICE_MTU);
 		}
 
+		if (info->name[0] && strcmp (priv->iface, info->name) != 0) {
+			nm_log_info (LOGD_DEVICE, "(%s): interface index %d renamed iface from '%s' to '%s'",
+			                          priv->iface, my_ifindex, priv->iface, info->name);
+			g_free (priv->iface);
+			priv->iface = g_strdup (info->name);
+
+			change_ip_ifname = !priv->ip_iface;
+			if (change_ip_ifname)
+				g_hash_table_remove_all (priv->ip6_saved_properties);
+
+			g_object_notify (G_OBJECT (device), NM_DEVICE_IFACE);
+			if (change_ip_ifname)
+				g_object_notify (G_OBJECT (device), NM_DEVICE_IP_IFACE);
+
+			/* Re-match available connections against the new interface name */
+			nm_device_recheck_available_connections (device);
+
+			/* Let any connections that use the new interface name have a chance
+			 * to auto-activate on the device.
+			 */
+			nm_device_emit_recheck_auto_activate (device);
+		}
+
 		if (klass->link_changed)
 			klass->link_changed (device, info);
+
+	} else if (priv->ip_iface && ifindex == nm_device_get_ip_ifindex (device)) {
+		if (info->name[0] && strcmp (priv->ip_iface, info->name)) {
+			nm_log_info (LOGD_DEVICE, "(%s): interface index %d renamed ip_iface (%d) from '%s' to '%s'",
+			                          priv->iface, my_ifindex, nm_device_get_ip_ifindex (device),
+			                          priv->ip_iface, info->name);
+			g_free (priv->ip_iface);
+			priv->ip_iface = g_strdup (info->name);
+
+			g_hash_table_remove_all (priv->ip6_saved_properties);
+
+			g_object_notify (G_OBJECT (device), NM_DEVICE_IP_IFACE);
+			change_ip_ifname = TRUE;
+		}
+	}
+
+	if (change_ip_ifname) {
+		if (priv->dhcp4_client) {
+			if (!nm_device_dhcp4_renew (device, FALSE)) {
+				nm_device_state_changed (device,
+				                         NM_DEVICE_STATE_FAILED,
+				                         NM_DEVICE_STATE_REASON_DHCP_FAILED);
+				return;
+			}
+		}
+		if (priv->dhcp6_client) {
+			if (!nm_device_dhcp6_renew (device, FALSE)) {
+				nm_device_state_changed (device,
+				                         NM_DEVICE_STATE_FAILED,
+				                         NM_DEVICE_STATE_REASON_DHCP_FAILED);
+				return;
+			}
+		}
+		if (priv->rdisc) {
+			/* FIXME: todo */
+		}
+		if (priv->dnsmasq_manager) {
+			/* FIXME: todo */
+		}
+	}
 }
 
 static void
@@ -3167,6 +3232,31 @@ dhcp6_start (NMDevice *self,
 	return ret;
 }
 
+gboolean
+nm_device_dhcp6_renew (NMDevice *self, gboolean release)
+{
+	NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE (self);
+	NMActStageReturn ret;
+	NMDeviceStateReason reason;
+	NMConnection *connection;
+
+	g_return_val_if_fail (priv->dhcp6_client != NULL, FALSE);
+
+	nm_log_info (LOGD_DHCP6, "(%s): DHCPv6 lease renewal requested",
+	             nm_device_get_iface (self));
+
+	/* Terminate old DHCP instance and release the old lease */
+	dhcp6_cleanup (self, TRUE, release);
+
+	connection = nm_device_get_connection (self);
+	g_assert (connection);
+
+	/* Start DHCP again on the interface */
+	ret = dhcp6_start (self, connection, priv->dhcp6_mode, &reason);
+
+	return (ret != NM_ACT_STAGE_RETURN_FAILURE);
+}
+
 /******************************************/
 
 static gboolean