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 struct sk_buff *fragments_tail;
24 ktime_t stamp;
25 int len; /* total length of orig datagram */
26 int meat;
27 __u8 last_in; /* first/last segment arrived? */
28
29 #define INET_FRAG_COMPLETE 4
30 #define INET_FRAG_FIRST_IN 2
31 #define INET_FRAG_LAST_IN 1
32 };
33
34 #define INETFRAGS_HASHSZ 64
35
36 /* averaged:
37 * max_depth = default ipfrag_high_thresh / INETFRAGS_HASHSZ /
38 * rounded up (SKB_TRUELEN(0) + sizeof(struct ipq or
39 * struct frag_queue))
40 */
41 #define INETFRAGS_MAXDEPTH 128
42
43 struct inet_frags {
44 struct hlist_head hash[INETFRAGS_HASHSZ];
45 rwlock_t lock;
46 u32 rnd;
47 int qsize;
48 int secret_interval;
49 struct timer_list secret_timer;
50
51 unsigned int (*hashfn)(struct inet_frag_queue *);
52 void (*constructor)(struct inet_frag_queue *q,
53 void *arg);
54 void (*destructor)(struct inet_frag_queue *);
55 void (*skb_free)(struct sk_buff *);
56 int (*match)(struct inet_frag_queue *q,
57 void *arg);
58 void (*frag_expire)(unsigned long data);
59 };
60
61 void inet_frags_init(struct inet_frags *);
62 void inet_frags_fini(struct inet_frags *);
63
64 void inet_frags_init_net(struct netns_frags *nf);
65 void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f);
66
67 void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
68 void inet_frag_destroy(struct inet_frag_queue *q,
69 struct inet_frags *f, int *work);
70 int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f);
71 struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
72 struct inet_frags *f, void *key, unsigned int hash)
73 __releases(&f->lock);
74 void inet_frag_maybe_warn_overflow(struct inet_frag_queue *q,
75 const char *prefix);
76
inet_frag_put(struct inet_frag_queue * q,struct inet_frags * f)77 static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
78 {
79 if (atomic_dec_and_test(&q->refcnt))
80 inet_frag_destroy(q, f, NULL);
81 }
82
83 #endif
84