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         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         u16                     max_size;
  34 };
  35
  36 #define INETFRAGS_HASHSZ                64
  37
  38 struct inet_frags {
  39         struct hlist_head       hash[INETFRAGS_HASHSZ];
  40         rwlock_t                lock;
  41         u32                     rnd;
  42         int                     qsize;
  43         int                     secret_interval;
  44         struct timer_list       secret_timer;
  45
  46         unsigned int            (*hashfn)(struct inet_frag_queue *);
  47         void                    (*constructor)(struct inet_frag_queue *q,
  48                                                 void *arg);
  49         void                    (*destructor)(struct inet_frag_queue *);
  50         void                    (*skb_free)(struct sk_buff *);
  51         bool                    (*match)(struct inet_frag_queue *q, 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 void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f);
  60
  61 void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
  62 void inet_frag_destroy(struct inet_frag_queue *q,
  63                                 struct inet_frags *f, int *work);
  64 int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f, bool force);
  65 struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
  66                 struct inet_frags *f, void *key, unsigned int hash)
  67         __releases(&f->lock);
  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