[mirror_ubuntu-zesty-kernel.git] / include / net / inet_frag.h

#ifndef __NET_FRAG_H__
#define __NET_FRAG_H__

struct netns_frags {
	int			nqueues;
	atomic_t		mem;
};

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 */
	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			qsize;
	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			(*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_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);

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
ac18e750	4	struct netns_frags {
e5a2bb84	5	int nqueues;
6ddc0822	6	atomic_t mem;
ac18e750 PE	7	};
ac18e750 PE	8
5ab11c98 PE	9	struct inet_frag_queue {
5ab11c98 PE	10	struct hlist_node list;
ac18e750	11	struct netns_frags *net;
5ab11c98 PE	12	struct list_head lru_list; /* lru list member */
	13	spinlock_t lock;
	14	atomic_t refcnt;
	15	struct timer_list timer; /* when will this queue expire? */
	16	struct sk_buff fragments; / list of received fragments */
	17	ktime_t stamp;
	18	int len; /* total length of orig datagram */
	19	int meat;
	20	__u8 last_in; /* first/last segment arrived? */
	21
	22	#define COMPLETE 4
	23	#define FIRST_IN 2
	24	#define LAST_IN 1
	25	};
	26
7eb95156 PE	27	#define INETFRAGS_HASHSZ 64
7eb95156 PE	28
04128f23 PE	29	struct inet_frags_ctl {
	30	int high_thresh;
	31	int low_thresh;
	32	int timeout;
	33	int secret_interval;
	34	};
	35
7eb95156 PE	36	struct inet_frags {
	37	struct list_head lru_list;
	38	struct hlist_head hash[INETFRAGS_HASHSZ];
	39	rwlock_t lock;
	40	u32 rnd;
1e4b8287	41	int qsize;
7eb95156	42	struct timer_list secret_timer;
04128f23	43	struct inet_frags_ctl *ctl;
321a3a99 PE	44
321a3a99 PE	45	unsigned int (hashfn)(struct inet_frag_queue );
c6fda282 PE	46	void (constructor)(struct inet_frag_queue q,
c6fda282 PE	47	void *arg);
1e4b8287 PE	48	void (destructor)(struct inet_frag_queue );
1e4b8287 PE	49	void (skb_free)(struct sk_buff );
abd6523d PE	50	int (match)(struct inet_frag_queue q,
abd6523d PE	51	void *arg);
e521db9d	52	void (*frag_expire)(unsigned long data);
7eb95156 PE	53	};
	54
	55	void inet_frags_init(struct inet_frags *);
	56	void inet_frags_fini(struct inet_frags *);
	57
e5a2bb84 PE	58	void inet_frags_init_net(struct netns_frags *nf);
e5a2bb84 PE	59
277e650d	60	void inet_frag_kill(struct inet_frag_queue q, struct inet_frags f);
1e4b8287 PE	61	void inet_frag_destroy(struct inet_frag_queue *q,
1e4b8287 PE	62	struct inet_frags f, int work);
6ddc0822	63	int inet_frag_evictor(struct netns_frags nf, struct inet_frags f);
ac18e750 PE	64	struct inet_frag_queue inet_frag_find(struct netns_frags nf,
ac18e750 PE	65	struct inet_frags f, void key, unsigned int hash);
277e650d	66
762cc408 PE	67	static inline void inet_frag_put(struct inet_frag_queue q, struct inet_frags f)
	68	{
	69	if (atomic_dec_and_test(&q->refcnt))
	70	inet_frag_destroy(q, f, NULL);
	71	}
	72
5ab11c98	73	#endif