Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/net/batman-adv/distributed-arp-table.h b/net/batman-adv/distributed-arp-table.h
index a045960..67c7729 100644
--- a/net/batman-adv/distributed-arp-table.h
+++ b/net/batman-adv/distributed-arp-table.h
@@ -1,19 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (C) 2011-2018  B.A.T.M.A.N. contributors:
+/* Copyright (C) 2011-2019  B.A.T.M.A.N. contributors:
  *
  * Antonio Quartulli
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
 #ifndef _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_
@@ -23,15 +11,14 @@
 
 #include <linux/compiler.h>
 #include <linux/netdevice.h>
+#include <linux/netlink.h>
+#include <linux/seq_file.h>
+#include <linux/skbuff.h>
 #include <linux/types.h>
 #include <uapi/linux/batadv_packet.h>
 
 #include "originator.h"
 
-struct netlink_callback;
-struct seq_file;
-struct sk_buff;
-
 #ifdef CONFIG_BATMAN_ADV_DAT
 
 /* BATADV_DAT_ADDR_MAX - maximum address value in the DHT space */
@@ -46,6 +33,12 @@
 					 struct sk_buff *skb);
 bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
 					 struct sk_buff *skb, int hdr_size);
+void batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv,
+					struct sk_buff *skb,
+					__be16 proto,
+					unsigned short vid);
+void batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv,
+					struct sk_buff *skb, int hdr_size);
 bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
 				      struct batadv_forw_packet *forw_packet);
 
@@ -140,6 +133,19 @@
 	return false;
 }
 
+static inline void
+batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv,
+				   struct sk_buff *skb, __be16 proto,
+				   unsigned short vid)
+{
+}
+
+static inline void
+batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv,
+				   struct sk_buff *skb, int hdr_size)
+{
+}
+
 static inline bool
 batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
 				 struct batadv_forw_packet *forw_packet)