[linux-block.git] / include / net / inet_frag.h

#ifndef __NET_FRAG_H__
#define __NET_FRAG_H__

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

#define COMPLETE		4
#define FIRST_IN		2
#define LAST_IN			1
};

#define INETFRAGS_HASHSZ		64

struct inet_frags_ctl {
	int high_thresh;
	int low_thresh;
	int timeout;
	int secret_interval;
};

struct inet_frags {
	struct list_head	lru_list;
	struct hlist_head	hash[INETFRAGS_HASHSZ];
	rwlock_t		lock;
	u32			rnd;
	int			nqueues;
	int			qsize;
	atomic_t		mem;
	struct timer_list	secret_timer;
	struct inet_frags_ctl	*ctl;

	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			(*equal)(struct inet_frag_queue *q1,
					 struct inet_frag_queue *q2);
	void			(*frag_expire)(unsigned long data);
};

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

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 inet_frags *f);
struct inet_frag_queue *inet_frag_create(struct inet_frags *f,
		void *create_arg, unsigned int hash);

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
Commit	Line	Data
5ab11c98 PE	1	#ifndef __NET_FRAG_H__
	2	#define __NET_FRAG_H__
	3
	4	struct inet_frag_queue {
	5	struct hlist_node list;
	6	struct list_head lru_list; /* lru list member */
	7	spinlock_t lock;
	8	atomic_t refcnt;
	9	struct timer_list timer; /* when will this queue expire? */
	10	struct sk_buff fragments; / list of received fragments */
	11	ktime_t stamp;
	12	int len; /* total length of orig datagram */
	13	int meat;
	14	__u8 last_in; /* first/last segment arrived? */
	15
	16	#define COMPLETE 4
	17	#define FIRST_IN 2
	18	#define LAST_IN 1
	19	};
	20
7eb95156 PE	21	#define INETFRAGS_HASHSZ 64
7eb95156 PE	22
04128f23 PE	23	struct inet_frags_ctl {
	24	int high_thresh;
	25	int low_thresh;
	26	int timeout;
	27	int secret_interval;
	28	};
	29
7eb95156 PE	30	struct inet_frags {
	31	struct list_head lru_list;
	32	struct hlist_head hash[INETFRAGS_HASHSZ];
	33	rwlock_t lock;
	34	u32 rnd;
	35	int nqueues;
1e4b8287	36	int qsize;
7eb95156 PE	37	atomic_t mem;
7eb95156 PE	38	struct timer_list secret_timer;
04128f23	39	struct inet_frags_ctl *ctl;
321a3a99 PE	40
321a3a99 PE	41	unsigned int (hashfn)(struct inet_frag_queue );
c6fda282 PE	42	void (constructor)(struct inet_frag_queue q,
c6fda282 PE	43	void *arg);
1e4b8287 PE	44	void (destructor)(struct inet_frag_queue );
1e4b8287 PE	45	void (skb_free)(struct sk_buff );
2588fe1d PE	46	int (equal)(struct inet_frag_queue q1,
2588fe1d PE	47	struct inet_frag_queue *q2);
e521db9d	48	void (*frag_expire)(unsigned long data);
7eb95156 PE	49	};
	50
	51	void inet_frags_init(struct inet_frags *);
	52	void inet_frags_fini(struct inet_frags *);
	53
277e650d	54	void inet_frag_kill(struct inet_frag_queue q, struct inet_frags f);
1e4b8287 PE	55	void inet_frag_destroy(struct inet_frag_queue *q,
1e4b8287 PE	56	struct inet_frags f, int work);
8e7999c4	57	int inet_frag_evictor(struct inet_frags *f);
c6fda282 PE	58	struct inet_frag_queue inet_frag_create(struct inet_frags f,
c6fda282 PE	59	void *create_arg, unsigned int hash);
277e650d	60
762cc408 PE	61	static inline void inet_frag_put(struct inet_frag_queue q, struct inet_frags f)
	62	{
	63	if (atomic_dec_and_test(&q->refcnt))
	64	inet_frag_destroy(q, f, NULL);
	65	}
	66
5ab11c98	67	#endif