#ifndef __NET_FRAG_H__
  #define __NET_FRAG_H__

  struct netns_frags {

  	int			nqueues;

  	atomic_t		mem;

  	struct list_head	lru_list;

  
  	/* sysctls */
  	int			timeout;

  	int			high_thresh;
  	int			low_thresh;

  };

  struct inet_frag_queue {
  	struct hlist_node	list;

  	struct netns_frags	*net;

  	struct list_head	lru_list;   /* lru list member */
  	spinlock_t		lock;
  	atomic_t		refcnt;
  	struct timer_list	timer;      /* when will this queue expire? */
  	struct sk_buff		*fragments; /* list of received fragments */

  	struct sk_buff		*fragments_tail;

  	ktime_t			stamp;
  	int			len;        /* total length of orig datagram */
  	int			meat;
  	__u8			last_in;    /* first/last segment arrived? */

  #define INET_FRAG_COMPLETE	4
  #define INET_FRAG_FIRST_IN	2
  #define INET_FRAG_LAST_IN	1

  };

  #define INETFRAGS_HASHSZ		64
  
  struct inet_frags {

  	struct hlist_head	hash[INETFRAGS_HASHSZ];
  	rwlock_t		lock;
  	u32			rnd;

  	int			qsize;

  	int			secret_interval;

  	struct timer_list	secret_timer;

  
  	unsigned int		(*hashfn)(struct inet_frag_queue *);

  	void			(*constructor)(struct inet_frag_queue *q,
  						void *arg);

  	void			(*destructor)(struct inet_frag_queue *);
  	void			(*skb_free)(struct sk_buff *);

  	int			(*match)(struct inet_frag_queue *q,
  						void *arg);

  	void			(*frag_expire)(unsigned long data);

  };
  
  void inet_frags_init(struct inet_frags *);
  void inet_frags_fini(struct inet_frags *);

  void inet_frags_init_net(struct netns_frags *nf);

  void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f);

  void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);

  void inet_frag_destroy(struct inet_frag_queue *q,
  				struct inet_frags *f, int *work);

  int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f);

  struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,

  		struct inet_frags *f, void *key, unsigned int hash)
  	__releases(&f->lock);

  static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
  {
  	if (atomic_dec_and_test(&q->refcnt))
  		inet_frag_destroy(q, f, NULL);
  }

  #endif