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

  #ifndef _NET_DN_ROUTE_H
  #define _NET_DN_ROUTE_H
  
  /******************************************************************************
      (c) 1995-1998 E.M. Serrat		emserrat@geocities.com
      

  *******************************************************************************/

  struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
  int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *,
  			 struct sock *sk, int flags);
  int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
  void dn_rt_cache_flush(int delay);

  int dn_route_rcv(struct sk_buff *skb, struct net_device *dev,
  		 struct packet_type *pt, struct net_device *orig_dev);

  
  /* Masks for flags field */
  #define DN_RT_F_PID 0x07 /* Mask for packet type                      */
  #define DN_RT_F_PF  0x80 /* Padding Follows                           */
  #define DN_RT_F_VER 0x40 /* Version =0 discard packet if ==1          */
  #define DN_RT_F_IE  0x20 /* Intra Ethernet, Reserved in short pkt     */
  #define DN_RT_F_RTS 0x10 /* Packet is being returned to sender        */
  #define DN_RT_F_RQR 0x08 /* Return packet to sender upon non-delivery */
  
  /* Mask for types of routing packets */
  #define DN_RT_PKT_MSK   0x06
  /* Types of routing packets */
  #define DN_RT_PKT_SHORT 0x02 /* Short routing packet */
  #define DN_RT_PKT_LONG  0x06 /* Long routing packet  */
  
  /* Mask for control/routing selection */
  #define DN_RT_PKT_CNTL  0x01 /* Set to 1 if a control packet  */
  /* Types of control packets */
  #define DN_RT_CNTL_MSK  0x0f /* Mask for control packets      */
  #define DN_RT_PKT_INIT  0x01 /* Initialisation packet         */
  #define DN_RT_PKT_VERI  0x03 /* Verification Message          */
  #define DN_RT_PKT_HELO  0x05 /* Hello and Test Message        */
  #define DN_RT_PKT_L1RT  0x07 /* Level 1 Routing Message       */
  #define DN_RT_PKT_L2RT  0x09 /* Level 2 Routing Message       */
  #define DN_RT_PKT_ERTH  0x0b /* Ethernet Router Hello         */
  #define DN_RT_PKT_EEDH  0x0d /* Ethernet EndNode Hello        */
  
  /* Values for info field in hello message */
  #define DN_RT_INFO_TYPE 0x03 /* Type mask                     */
  #define DN_RT_INFO_L1RT 0x02 /* L1 Router                     */
  #define DN_RT_INFO_L2RT 0x01 /* L2 Router                     */
  #define DN_RT_INFO_ENDN 0x03 /* EndNode                       */
  #define DN_RT_INFO_VERI 0x04 /* Verification Reqd.            */
  #define DN_RT_INFO_RJCT 0x08 /* Reject Flag, Reserved         */
  #define DN_RT_INFO_VFLD 0x10 /* Verification Failed, Reserved */
  #define DN_RT_INFO_NOML 0x20 /* No Multicast traffic accepted */
  #define DN_RT_INFO_BLKR 0x40 /* Blocking Requested            */
  
  /*
   * The fl structure is what we used to look up the route.
   * The rt_saddr & rt_daddr entries are the same as key.saddr & key.daddr
   * except for local input routes, where the rt_saddr = fl.fld_dst and
   * rt_daddr = fl.fld_src to allow the route to be used for returning
   * packets to the originating host.
   */
  struct dn_route {

  	struct dst_entry dst;

  	struct dn_route __rcu *dn_next;

  	struct neighbour *n;

  	struct flowidn fld;

  	__le16 rt_saddr;
  	__le16 rt_daddr;
  	__le16 rt_gateway;
  	__le16 rt_local_src;	/* Source used for forwarding packets */
  	__le16 rt_src_map;
  	__le16 rt_dst_map;

  	unsigned int rt_flags;
  	unsigned int rt_type;

  };

  static inline bool dn_is_input_route(struct dn_route *rt)
  {

  	return rt->fld.flowidn_iif != 0;

  }
  
  static inline bool dn_is_output_route(struct dn_route *rt)
  {

  	return rt->fld.flowidn_iif == 0;

  }

  void dn_route_init(void);
  void dn_route_cleanup(void);

  
  #include <net/sock.h>
  #include <linux/if_arp.h>
  
  static inline void dn_rt_send(struct sk_buff *skb)
  {
  	dev_queue_xmit(skb);
  }
  
  static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst, char *src)
  {
  	struct net_device *dev = skb->dev;
  
  	if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
  		dst = NULL;

  	if (dev_hard_header(skb, dev, ETH_P_DNA_RT, dst, src, skb->len) >= 0)

  		dn_rt_send(skb);
  	else
  		kfree_skb(skb);
  }
  
  #endif /* _NET_DN_ROUTE_H */