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

#ifndef __NET_FRAG_H__
#define __NET_FRAG_H__

struct netns_frags {
	int			nqueues;
	atomic_t		mem;

	/* sysctls */
	int			timeout;
};

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 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;
b2fd5321 PE	7
	8	/* sysctls */
	9	int timeout;
ac18e750 PE	10	};
ac18e750 PE	11
5ab11c98 PE	12	struct inet_frag_queue {
5ab11c98 PE	13	struct hlist_node list;
ac18e750	14	struct netns_frags *net;
5ab11c98 PE	15	struct list_head lru_list; /* lru list member */
	16	spinlock_t lock;
	17	atomic_t refcnt;
	18	struct timer_list timer; /* when will this queue expire? */
	19	struct sk_buff fragments; / list of received fragments */
	20	ktime_t stamp;
	21	int len; /* total length of orig datagram */
	22	int meat;
	23	__u8 last_in; /* first/last segment arrived? */
	24
	25	#define COMPLETE 4
	26	#define FIRST_IN 2
	27	#define LAST_IN 1
	28	};
	29
7eb95156 PE	30	#define INETFRAGS_HASHSZ 64
7eb95156 PE	31
04128f23 PE	32	struct inet_frags_ctl {
	33	int high_thresh;
	34	int low_thresh;
04128f23 PE	35	int secret_interval;
	36	};
	37
7eb95156 PE	38	struct inet_frags {
	39	struct list_head lru_list;
	40	struct hlist_head hash[INETFRAGS_HASHSZ];
	41	rwlock_t lock;
	42	u32 rnd;
1e4b8287	43	int qsize;
7eb95156	44	struct timer_list secret_timer;
04128f23	45	struct inet_frags_ctl *ctl;
321a3a99 PE	46
321a3a99 PE	47	unsigned int (hashfn)(struct inet_frag_queue );
c6fda282 PE	48	void (constructor)(struct inet_frag_queue q,
c6fda282 PE	49	void *arg);
1e4b8287 PE	50	void (destructor)(struct inet_frag_queue );
1e4b8287 PE	51	void (skb_free)(struct sk_buff );
abd6523d PE	52	int (match)(struct inet_frag_queue q,
abd6523d PE	53	void *arg);
e521db9d	54	void (*frag_expire)(unsigned long data);
7eb95156 PE	55	};
	56
	57	void inet_frags_init(struct inet_frags *);
	58	void inet_frags_fini(struct inet_frags *);
	59
e5a2bb84 PE	60	void inet_frags_init_net(struct netns_frags *nf);
e5a2bb84 PE	61
277e650d	62	void inet_frag_kill(struct inet_frag_queue q, struct inet_frags f);
1e4b8287 PE	63	void inet_frag_destroy(struct inet_frag_queue *q,
1e4b8287 PE	64	struct inet_frags f, int work);
6ddc0822	65	int inet_frag_evictor(struct netns_frags nf, struct inet_frags f);
ac18e750 PE	66	struct inet_frag_queue inet_frag_find(struct netns_frags nf,
ac18e750 PE	67	struct inet_frags f, void key, unsigned int hash);
277e650d	68
762cc408 PE	69	static inline void inet_frag_put(struct inet_frag_queue q, struct inet_frags f)
	70	{
	71	if (atomic_dec_and_test(&q->refcnt))
	72	inet_frag_destroy(q, f, NULL);
	73	}
	74
5ab11c98	75	#endif