include/net/inet_frag.h

   1 #ifndef __NET_FRAG_H__
   2 #define __NET_FRAG_H__
   3
   4 struct netns_frags {
   5 };
   6
   7 struct inet_frag_queue {
   8         struct hlist_node       list;
   9         struct netns_frags      *net;
  10         struct list_head        lru_list;   /* lru list member */
  11         spinlock_t              lock;
  12         atomic_t                refcnt;
  13         struct timer_list       timer;      /* when will this queue expire? */
  14         struct sk_buff          *fragments; /* list of received fragments */
  15         ktime_t                 stamp;
  16         int                     len;        /* total length of orig datagram */
  17         int                     meat;
  18         __u8                    last_in;    /* first/last segment arrived? */
  19
  20 #define COMPLETE                4
  21 #define FIRST_IN                2
  22 #define LAST_IN                 1
  23 };
  24
  25 #define INETFRAGS_HASHSZ                64
  26
  27 struct inet_frags_ctl {
  28         int high_thresh;
  29         int low_thresh;
  30         int timeout;
  31         int secret_interval;
  32 };
  33
  34 struct inet_frags {
  35         struct list_head        lru_list;
  36         struct hlist_head       hash[INETFRAGS_HASHSZ];
  37         rwlock_t                lock;
  38         u32                     rnd;
  39         int                     nqueues;
  40         int                     qsize;
  41         atomic_t                mem;
  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_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
  59 void inet_frag_destroy(struct inet_frag_queue *q,
  60                                 struct inet_frags *f, int *work);
  61 int inet_frag_evictor(struct inet_frags *f);
  62 struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
  63                 struct inet_frags *f, void *key, unsigned int hash);
  64
  65 static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
  66 {
  67         if (atomic_dec_and_test(&q->refcnt))
  68                 inet_frag_destroy(q, f, NULL);
  69 }
  70
  71 #endif