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