/* SPDX-License-Identifier: GPL-2.0 */

  /* Copyright (C) 2011-2018  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_
  #define _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_

  #include "main.h"
  
  #include <linux/compiler.h>
  #include <linux/netdevice.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 */

  #define BATADV_DAT_ADDR_MAX ((batadv_dat_addr_t)~(batadv_dat_addr_t)0)

  void batadv_dat_status_update(struct net_device *net_dev);

  bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
  					   struct sk_buff *skb);
  bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
  					   struct sk_buff *skb, int hdr_size);
  void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
  					 struct sk_buff *skb);
  bool batadv_dat_snoop_incoming_arp_reply(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);

  /**

   * batadv_dat_init_orig_node_addr() - assign a DAT address to the orig_node

   * @orig_node: the node to assign the DAT address to
   */
  static inline void
  batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
  {

  	u32 addr;

  
  	addr = batadv_choose_orig(orig_node->orig, BATADV_DAT_ADDR_MAX);
  	orig_node->dat_addr = (batadv_dat_addr_t)addr;
  }
  
  /**

   * batadv_dat_init_own_addr() - assign a DAT address to the node itself

   * @bat_priv: the bat priv with all the soft interface information
   * @primary_if: a pointer to the primary interface
   */
  static inline void
  batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
  			 struct batadv_hard_iface *primary_if)
  {

  	u32 addr;

  
  	addr = batadv_choose_orig(primary_if->net_dev->dev_addr,
  				  BATADV_DAT_ADDR_MAX);
  
  	bat_priv->dat.addr = (batadv_dat_addr_t)addr;
  }

  int batadv_dat_init(struct batadv_priv *bat_priv);
  void batadv_dat_free(struct batadv_priv *bat_priv);
  int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset);

  int batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb);

  /**

   * batadv_dat_inc_counter() - increment the correct DAT packet counter

   * @bat_priv: the bat priv with all the soft interface information
   * @subtype: the 4addr subtype of the packet to be counted
   *
   * Updates the ethtool statistics for the received packet if it is a DAT subtype
   */
  static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,

  					  u8 subtype)

  {
  	switch (subtype) {
  	case BATADV_P_DAT_DHT_GET:
  		batadv_inc_counter(bat_priv,
  				   BATADV_CNT_DAT_GET_RX);
  		break;
  	case BATADV_P_DAT_DHT_PUT:
  		batadv_inc_counter(bat_priv,
  				   BATADV_CNT_DAT_PUT_RX);
  		break;
  	}
  }

  #else

  static inline void batadv_dat_status_update(struct net_device *net_dev)
  {
  }

  static inline bool
  batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
  				      struct sk_buff *skb)
  {
  	return false;
  }
  
  static inline bool
  batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
  				      struct sk_buff *skb, int hdr_size)
  {
  	return false;
  }
  
  static inline bool
  batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
  				    struct sk_buff *skb)
  {
  	return false;
  }
  
  static inline bool
  batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
  				    struct sk_buff *skb, int hdr_size)
  {
  	return false;
  }
  
  static inline bool
  batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
  				 struct batadv_forw_packet *forw_packet)
  {
  	return false;
  }
  
  static inline void
  batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
  {
  }
  
  static inline void batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
  					    struct batadv_hard_iface *iface)
  {
  }
  
  static inline void batadv_arp_change_timeout(struct net_device *soft_iface,
  					     const char *name)
  {
  }
  
  static inline int batadv_dat_init(struct batadv_priv *bat_priv)
  {
  	return 0;
  }
  
  static inline void batadv_dat_free(struct batadv_priv *bat_priv)
  {
  }

  static inline int
  batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb)
  {
  	return -EOPNOTSUPP;
  }

  static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,

  					  u8 subtype)

  {
  }

  #endif /* CONFIG_BATMAN_ADV_DAT */

  #endif /* _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_ */