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 ktime_t stamp; 24 int len; /* total length of orig datagram */ 25 int meat; 26 __u8 last_in; /* first/last segment arrived? */ 27 28 #define INET_FRAG_COMPLETE 4 29 #define INET_FRAG_FIRST_IN 2 30 #define INET_FRAG_LAST_IN 1 31 }; 32 33 #define INETFRAGS_HASHSZ 64 34 35 struct inet_frags { 36 struct hlist_head hash[INETFRAGS_HASHSZ]; 37 rwlock_t lock; 38 u32 rnd; 39 int qsize; 40 int secret_interval; 41 struct timer_list secret_timer; 42 43 unsigned int (*hashfn)(struct inet_frag_queue *); 44 void (*constructor)(struct inet_frag_queue *q, 45 void *arg); 46 void (*destructor)(struct inet_frag_queue *); 47 void (*skb_free)(struct sk_buff *); 48 int (*match)(struct inet_frag_queue *q, 49 void *arg); 50 void (*frag_expire)(unsigned long data); 51 }; 52 53 void inet_frags_init(struct inet_frags *); 54 void inet_frags_fini(struct inet_frags *); 55 56 void inet_frags_init_net(struct netns_frags *nf); 57 void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f); 58 59 void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f); 60 void inet_frag_destroy(struct inet_frag_queue *q, 61 struct inet_frags *f, int *work); 62 int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f); 63 struct inet_frag_queue *inet_frag_find(struct netns_frags *nf, 64 struct inet_frags *f, void *key, unsigned int hash) 65 __releases(&f->lock); 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 74