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

  #ifndef _NET_DN_FIB_H
  #define _NET_DN_FIB_H

  #include <linux/netlink.h>

  #include <linux/refcount.h>

  
  extern const struct nla_policy rtm_dn_policy[];

  
  struct dn_fib_res {

  	struct fib_rule *r;

  	struct dn_fib_info *fi;
  	unsigned char prefixlen;
  	unsigned char nh_sel;
  	unsigned char type;
  	unsigned char scope;
  };
  
  struct dn_fib_nh {
  	struct net_device	*nh_dev;

  	unsigned int		nh_flags;

  	unsigned char		nh_scope;
  	int			nh_weight;
  	int			nh_power;
  	int			nh_oif;

  	__le16			nh_gw;

  };
  
  struct dn_fib_info {
  	struct dn_fib_info	*fib_next;
  	struct dn_fib_info	*fib_prev;
  	int 			fib_treeref;

  	refcount_t		fib_clntref;

  	int			fib_dead;

  	unsigned int		fib_flags;

  	int			fib_protocol;

  	__le16			fib_prefsrc;

  	__u32			fib_priority;
  	__u32			fib_metrics[RTAX_MAX];

  	int			fib_nhs;
  	int			fib_power;
  	struct dn_fib_nh	fib_nh[0];
  #define dn_fib_dev		fib_nh[0].nh_dev
  };
  
  
  #define DN_FIB_RES_RESET(res)	((res).nh_sel = 0)
  #define DN_FIB_RES_NH(res)	((res).fi->fib_nh[(res).nh_sel])
  
  #define DN_FIB_RES_PREFSRC(res)	((res).fi->fib_prefsrc ? : __dn_fib_res_prefsrc(&res))
  #define DN_FIB_RES_GW(res)	(DN_FIB_RES_NH(res).nh_gw)
  #define DN_FIB_RES_DEV(res)	(DN_FIB_RES_NH(res).nh_dev)
  #define DN_FIB_RES_OIF(res)	(DN_FIB_RES_NH(res).nh_oif)
  
  typedef struct {

  	__le16	datum;

  } dn_fib_key_t;
  
  typedef struct {

  	__le16	datum;

  } dn_fib_hash_t;
  
  typedef struct {

  	__u16	datum;

  } dn_fib_idx_t;
  
  struct dn_fib_node {
  	struct dn_fib_node *fn_next;
  	struct dn_fib_info *fn_info;
  #define DN_FIB_INFO(f) ((f)->fn_info)
  	dn_fib_key_t	fn_key;
  	u8		fn_type;
  	u8		fn_scope;
  	u8		fn_state;
  };
  
  
  struct dn_fib_table {

  	struct hlist_node hlist;

  	u32 n;

  
  	int (*insert)(struct dn_fib_table *t, struct rtmsg *r, 

  			struct nlattr *attrs[], struct nlmsghdr *n,

  			struct netlink_skb_parms *req);
  	int (*delete)(struct dn_fib_table *t, struct rtmsg *r,

  			struct nlattr *attrs[], struct nlmsghdr *n,

  			struct netlink_skb_parms *req);

  	int (*lookup)(struct dn_fib_table *t, const struct flowidn *fld,

  			struct dn_fib_res *res);
  	int (*flush)(struct dn_fib_table *t);
  	int (*dump)(struct dn_fib_table *t, struct sk_buff *skb, struct netlink_callback *cb);
  
  	unsigned char data[0];
  };
  
  #ifdef CONFIG_DECNET_ROUTER
  /*
   * dn_fib.c
   */

  void dn_fib_init(void);
  void dn_fib_cleanup(void);
  
  int dn_fib_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
  struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r,
  				       struct nlattr *attrs[],
  				       const struct nlmsghdr *nlh, int *errp);
  int dn_fib_semantic_match(int type, struct dn_fib_info *fi,
  			  const struct flowidn *fld, struct dn_fib_res *res);
  void dn_fib_release_info(struct dn_fib_info *fi);
  void dn_fib_flush(void);
  void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res);

  
  /*
   * dn_tables.c
   */

  struct dn_fib_table *dn_fib_get_table(u32 n, int creat);
  struct dn_fib_table *dn_fib_empty_table(void);
  void dn_fib_table_init(void);
  void dn_fib_table_cleanup(void);

  
  /*
   * dn_rules.c
   */

  void dn_fib_rules_init(void);
  void dn_fib_rules_cleanup(void);
  unsigned int dnet_addr_type(__le16 addr);
  int dn_fib_lookup(struct flowidn *fld, struct dn_fib_res *res);

  int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb);

  void dn_fib_free_info(struct dn_fib_info *fi);

  
  static inline void dn_fib_info_put(struct dn_fib_info *fi)
  {

  	if (refcount_dec_and_test(&fi->fib_clntref))

  		dn_fib_free_info(fi);
  }
  
  static inline void dn_fib_res_put(struct dn_fib_res *res)
  {
  	if (res->fi)
  		dn_fib_info_put(res->fi);
  	if (res->r)

  		fib_rule_put(res->r);

  }

  #else /* Endnode */
  
  #define dn_fib_init()  do { } while(0)
  #define dn_fib_cleanup() do { } while(0)
  
  #define dn_fib_lookup(fl, res) (-ESRCH)
  #define dn_fib_info_put(fi) do { } while(0)
  #define dn_fib_select_multipath(fl, res) do { } while(0)
  #define dn_fib_rules_policy(saddr,res,flags) (0)
  #define dn_fib_res_put(res) do { } while(0)
  
  #endif /* CONFIG_DECNET_ROUTER */

  static inline __le16 dnet_make_mask(int n)

  {

  	if (n)
  		return cpu_to_le16(~((1 << (16 - n)) - 1));
  	return cpu_to_le16(0);

  }
  
  #endif /* _NET_DN_FIB_H */