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   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                     (*equal)(struct inet_frag_queue *q1,
  47                                          struct inet_frag_queue *q2);
  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_create(struct inet_frags *f,
  59                 void *create_arg, 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