Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / include / net / inet_frag.h
1 #ifndef __NET_FRAG_H__
2 #define __NET_FRAG_H__
3
4 struct netns_frags {
5         int                     nqueues;
6         atomic_t                mem;
7         struct list_head        lru_list;
8
9         /* sysctls */
10         int                     timeout;
11         int                     high_thresh;
12         int                     low_thresh;
13 };
14
15 struct inet_frag_queue {
16         struct hlist_node       list;
17         struct netns_frags      *net;
18         struct list_head        lru_list;   /* lru list member */
19         spinlock_t              lock;
20         atomic_t                refcnt;
21         struct timer_list       timer;      /* when will this queue expire? */
22         struct sk_buff          *fragments; /* list of received fragments */
23         ktime_t                 stamp;
24         int                     len;        /* total length of orig datagram */
25         int                     meat;
26         __u8                    last_in;    /* first/last segment arrived? */
27
28 #define INET_FRAG_COMPLETE      4
29 #define INET_FRAG_FIRST_IN      2
30 #define INET_FRAG_LAST_IN       1
31 };
32
33 #define INETFRAGS_HASHSZ                64
34
35 struct inet_frags {
36         struct hlist_head       hash[INETFRAGS_HASHSZ];
37         rwlock_t                lock;
38         u32                     rnd;
39         int                     qsize;
40         int                     secret_interval;
41         struct timer_list       secret_timer;
42
43         unsigned int            (*hashfn)(struct inet_frag_queue *);
44         void                    (*constructor)(struct inet_frag_queue *q,
45                                                 void *arg);
46         void                    (*destructor)(struct inet_frag_queue *);
47         void                    (*skb_free)(struct sk_buff *);
48         int                     (*match)(struct inet_frag_queue *q,
49                                                 void *arg);
50         void                    (*frag_expire)(unsigned long data);
51 };
52
53 void inet_frags_init(struct inet_frags *);
54 void inet_frags_fini(struct inet_frags *);
55
56 void inet_frags_init_net(struct netns_frags *nf);
57 void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f);
58
59 void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
60 void inet_frag_destroy(struct inet_frag_queue *q,
61                                 struct inet_frags *f, int *work);
62 int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f);
63 struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
64                 struct inet_frags *f, void *key, unsigned int hash)
65         __releases(&f->lock);
66
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
73 #endif