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   1 #ifndef __NET_FRAG_H__
   2 #define __NET_FRAG_H__
   3
   4 struct netns_frags {
   5         int                     nqueues;
   6         atomic_t                mem;
   7
   8         /* sysctls */
   9         int                     timeout;
  10         int                     high_thresh;
  11         int                     low_thresh;
  12 };
  13
  14 struct inet_frag_queue {
  15         struct hlist_node       list;
  16         struct netns_frags      *net;
  17         struct list_head        lru_list;   /* lru list member */
  18         spinlock_t              lock;
  19         atomic_t                refcnt;
  20         struct timer_list       timer;      /* when will this queue expire? */
  21         struct sk_buff          *fragments; /* list of received fragments */
  22         ktime_t                 stamp;
  23         int                     len;        /* total length of orig datagram */
  24         int                     meat;
  25         __u8                    last_in;    /* first/last segment arrived? */
  26
  27 #define COMPLETE                4
  28 #define FIRST_IN                2
  29 #define LAST_IN                 1
  30 };
  31
  32 #define INETFRAGS_HASHSZ                64
  33
  34 struct inet_frags_ctl {
  35         int secret_interval;
  36 };
  37
  38 struct inet_frags {
  39         struct list_head        lru_list;
  40         struct hlist_head       hash[INETFRAGS_HASHSZ];
  41         rwlock_t                lock;
  42         u32                     rnd;
  43         int                     qsize;
  44         struct timer_list       secret_timer;
  45         struct inet_frags_ctl   *ctl;
  46
  47         unsigned int            (*hashfn)(struct inet_frag_queue *);
  48         void                    (*constructor)(struct inet_frag_queue *q,
  49                                                 void *arg);
  50         void                    (*destructor)(struct inet_frag_queue *);
  51         void                    (*skb_free)(struct sk_buff *);
  52         int                     (*match)(struct inet_frag_queue *q,
  53                                                 void *arg);
  54         void                    (*frag_expire)(unsigned long data);
  55 };
  56
  57 void inet_frags_init(struct inet_frags *);
  58 void inet_frags_fini(struct inet_frags *);
  59
  60 void inet_frags_init_net(struct netns_frags *nf);
  61
  62 void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
  63 void inet_frag_destroy(struct inet_frag_queue *q,
  64                                 struct inet_frags *f, int *work);
  65 int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f);
  66 struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
  67                 struct inet_frags *f, void *key, unsigned int hash);
  68
  69 static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
  70 {
  71         if (atomic_dec_and_test(&q->refcnt))
  72                 inet_frag_destroy(q, f, NULL);
  73 }
  74
  75 #endif