Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6
[linux-2.6] / include / net / inet_frag.h
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
21 #define INETFRAGS_HASHSZ                64
22
23 struct inet_frags_ctl {
24         int high_thresh;
25         int low_thresh;
26         int timeout;
27         int secret_interval;
28 };
29
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;
36         int                     qsize;
37         atomic_t                mem;
38         struct timer_list       secret_timer;
39         struct inet_frags_ctl   *ctl;
40
41         unsigned int            (*hashfn)(struct inet_frag_queue *);
42         void                    (*constructor)(struct inet_frag_queue *q,
43                                                 void *arg);
44         void                    (*destructor)(struct inet_frag_queue *);
45         void                    (*skb_free)(struct sk_buff *);
46         int                     (*match)(struct inet_frag_queue *q,
47                                                 void *arg);
48         void                    (*frag_expire)(unsigned long data);
49 };
50
51 void inet_frags_init(struct inet_frags *);
52 void inet_frags_fini(struct inet_frags *);
53
54 void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
55 void inet_frag_destroy(struct inet_frag_queue *q,
56                                 struct inet_frags *f, int *work);
57 int inet_frag_evictor(struct inet_frags *f);
58 struct inet_frag_queue *inet_frag_find(struct inet_frags *f, void *key,
59                 unsigned int hash);
60
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
67 #endif