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 (*match)(struct inet_frag_queue *q, 47 void *arg); 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_find(struct inet_frags *f, void *key, 59 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 68