[NETNS][FRAGS]: Make the mem counter per-namespace.
[linux-2.6] / 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 };
8
9 struct inet_frag_queue {
10         struct hlist_node       list;
11         struct netns_frags      *net;
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
27 #define INETFRAGS_HASHSZ                64
28
29 struct inet_frags_ctl {
30         int high_thresh;
31         int low_thresh;
32         int timeout;
33         int secret_interval;
34 };
35
36 struct inet_frags {
37         struct list_head        lru_list;
38         struct hlist_head       hash[INETFRAGS_HASHSZ];
39         rwlock_t                lock;
40         u32                     rnd;
41         int                     qsize;
42         struct timer_list       secret_timer;
43         struct inet_frags_ctl   *ctl;
44
45         unsigned int            (*hashfn)(struct inet_frag_queue *);
46         void                    (*constructor)(struct inet_frag_queue *q,
47                                                 void *arg);
48         void                    (*destructor)(struct inet_frag_queue *);
49         void                    (*skb_free)(struct sk_buff *);
50         int                     (*match)(struct inet_frag_queue *q,
51                                                 void *arg);
52         void                    (*frag_expire)(unsigned long data);
53 };
54
55 void inet_frags_init(struct inet_frags *);
56 void inet_frags_fini(struct inet_frags *);
57
58 void inet_frags_init_net(struct netns_frags *nf);
59
60 void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
61 void inet_frag_destroy(struct inet_frag_queue *q,
62                                 struct inet_frags *f, int *work);
63 int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f);
64 struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
65                 struct inet_frags *f, void *key, unsigned int hash);
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