[deliverable/linux.git] / include / net / inet_frag.h

#ifndef __NET_FRAG_H__
#define __NET_FRAG_H__

struct netns_frags {
	int			nqueues;
	struct list_head	lru_list;

	/* Its important for performance to keep lru_list and mem on
	 * separate cachelines
	 */
	atomic_t		mem ____cacheline_aligned_in_smp;
	/* sysctls */
	int			timeout;
	int			high_thresh;
	int			low_thresh;
};

struct inet_frag_queue {
	spinlock_t		lock;
	struct timer_list	timer;      /* when will this queue expire? */
	struct list_head	lru_list;   /* lru list member */
	struct hlist_node	list;
	atomic_t		refcnt;
	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

	u16			max_size;

	struct netns_frags	*net;
};

#define INETFRAGS_HASHSZ		64

struct inet_frags {
	struct hlist_head	hash[INETFRAGS_HASHSZ];
	/* This rwlock is a global lock (seperate per IPv4, IPv6 and
	 * netfilter). Important to keep this on a seperate cacheline.
	 */
	rwlock_t		lock ____cacheline_aligned_in_smp;
	int			secret_interval;
	struct timer_list	secret_timer;
	u32			rnd;
	int			qsize;

	unsigned int		(*hashfn)(struct inet_frag_queue *);
	bool			(*match)(struct inet_frag_queue *q, void *arg);
	void			(*constructor)(struct inet_frag_queue *q,
						void *arg);
	void			(*destructor)(struct inet_frag_queue *);
	void			(*skb_free)(struct sk_buff *);
	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, bool force);
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);
}

/* Memory Tracking Functions. */

static inline int frag_mem_limit(struct netns_frags *nf)
{
	return atomic_read(&nf->mem);
}

static inline void sub_frag_mem_limit(struct inet_frag_queue *q, int i)
{
	atomic_sub(i, &q->net->mem);
}

static inline void add_frag_mem_limit(struct inet_frag_queue *q, int i)
{
	atomic_add(i, &q->net->mem);
}

static inline void init_frag_mem_limit(struct netns_frags *nf)
{
	atomic_set(&nf->mem, 0);
}

static inline int sum_frag_mem_limit(struct netns_frags *nf)
{
	return atomic_read(&nf->mem);
}

#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;
3140c25c	6	struct list_head lru_list;
b2fd5321	7
cd39a789 JDB	8	/* Its important for performance to keep lru_list and mem on
	9	* separate cachelines
	10	*/
	11	atomic_t mem ____cacheline_aligned_in_smp;
b2fd5321 PE	12	/* sysctls */
b2fd5321 PE	13	int timeout;
e31e0bdc PE	14	int high_thresh;
e31e0bdc PE	15	int low_thresh;
ac18e750 PE	16	};
ac18e750 PE	17
5ab11c98	18	struct inet_frag_queue {
5ab11c98	19	spinlock_t lock;
5ab11c98	20	struct timer_list timer; /* when will this queue expire? */
6e34a8b3 JDB	21	struct list_head lru_list; /* lru list member */
	22	struct hlist_node list;
	23	atomic_t refcnt;
5ab11c98	24	struct sk_buff fragments; / list of received fragments */
d6bebca9	25	struct sk_buff *fragments_tail;
5ab11c98 PE	26	ktime_t stamp;
	27	int len; /* total length of orig datagram */
	28	int meat;
	29	__u8 last_in; /* first/last segment arrived? */
	30
bc578a54 JP	31	#define INET_FRAG_COMPLETE 4
	32	#define INET_FRAG_FIRST_IN 2
	33	#define INET_FRAG_LAST_IN 1
5f2d04f1 PM	34
5f2d04f1 PM	35	u16 max_size;
6e34a8b3 JDB	36
6e34a8b3 JDB	37	struct netns_frags *net;
5ab11c98 PE	38	};
5ab11c98 PE	39
7eb95156 PE	40	#define INETFRAGS_HASHSZ 64
	41
	42	struct inet_frags {
7eb95156	43	struct hlist_head hash[INETFRAGS_HASHSZ];
5f8e1e8b JDB	44	/* This rwlock is a global lock (seperate per IPv4, IPv6 and
	45	* netfilter). Important to keep this on a seperate cacheline.
	46	*/
	47	rwlock_t lock ____cacheline_aligned_in_smp;
3b4bc4a2	48	int secret_interval;
7eb95156	49	struct timer_list secret_timer;
5f8e1e8b JDB	50	u32 rnd;
5f8e1e8b JDB	51	int qsize;
321a3a99 PE	52
321a3a99 PE	53	unsigned int (hashfn)(struct inet_frag_queue );
5f8e1e8b	54	bool (match)(struct inet_frag_queue q, void *arg);
c6fda282 PE	55	void (constructor)(struct inet_frag_queue q,
c6fda282 PE	56	void *arg);
1e4b8287 PE	57	void (destructor)(struct inet_frag_queue );
1e4b8287 PE	58	void (skb_free)(struct sk_buff );
e521db9d	59	void (*frag_expire)(unsigned long data);
7eb95156 PE	60	};
	61
	62	void inet_frags_init(struct inet_frags *);
	63	void inet_frags_fini(struct inet_frags *);
	64
e5a2bb84	65	void inet_frags_init_net(struct netns_frags *nf);
81566e83	66	void inet_frags_exit_net(struct netns_frags nf, struct inet_frags f);
e5a2bb84	67
277e650d	68	void inet_frag_kill(struct inet_frag_queue q, struct inet_frags f);
1e4b8287 PE	69	void inet_frag_destroy(struct inet_frag_queue *q,
1e4b8287 PE	70	struct inet_frags f, int work);
6b102865	71	int inet_frag_evictor(struct netns_frags nf, struct inet_frags f, bool force);
ac18e750	72	struct inet_frag_queue inet_frag_find(struct netns_frags nf,
56bca31f HE	73	struct inet_frags f, void key, unsigned int hash)
56bca31f HE	74	__releases(&f->lock);
277e650d	75
762cc408 PE	76	static inline void inet_frag_put(struct inet_frag_queue q, struct inet_frags f)
	77	{
	78	if (atomic_dec_and_test(&q->refcnt))
	79	inet_frag_destroy(q, f, NULL);
	80	}
	81
d433673e JDB	82	/* Memory Tracking Functions. */
	83
	84	static inline int frag_mem_limit(struct netns_frags *nf)
	85	{
	86	return atomic_read(&nf->mem);
	87	}
	88
	89	static inline void sub_frag_mem_limit(struct inet_frag_queue *q, int i)
	90	{
	91	atomic_sub(i, &q->net->mem);
	92	}
	93
	94	static inline void add_frag_mem_limit(struct inet_frag_queue *q, int i)
	95	{
	96	atomic_add(i, &q->net->mem);
	97	}
	98
	99	static inline void init_frag_mem_limit(struct netns_frags *nf)
	100	{
	101	atomic_set(&nf->mem, 0);
	102	}
	103
	104	static inline int sum_frag_mem_limit(struct netns_frags *nf)
	105	{
	106	return atomic_read(&nf->mem);
	107	}
	108
5ab11c98	109	#endif