1#ifndef __NET_FRAG_H__ 2#define __NET_FRAG_H__ 3 4struct 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 15struct 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 34#define INETFRAGS_HASHSZ 64 35 36struct inet_frags { 37 struct hlist_head hash[INETFRAGS_HASHSZ]; 38 rwlock_t lock; 39 u32 rnd; 40 int qsize; 41 int secret_interval; 42 struct timer_list secret_timer; 43 44 unsigned int (*hashfn)(struct inet_frag_queue *); 45 void (*constructor)(struct inet_frag_queue *q, 46 void *arg); 47 void (*destructor)(struct inet_frag_queue *); 48 void (*skb_free)(struct sk_buff *); 49 int (*match)(struct inet_frag_queue *q, 50 void *arg); 51 void (*frag_expire)(unsigned long data); 52}; 53 54void inet_frags_init(struct inet_frags *); 55void inet_frags_fini(struct inet_frags *); 56 57void inet_frags_init_net(struct netns_frags *nf); 58void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f); 59 60void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f); 61void inet_frag_destroy(struct inet_frag_queue *q, 62 struct inet_frags *f, int *work); 63int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f); 64struct inet_frag_queue *inet_frag_find(struct netns_frags *nf, 65 struct inet_frags *f, void *key, unsigned int hash) 66 __releases(&f->lock); 67 68static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f) 69{ 70 if (atomic_dec_and_test(&q->refcnt)) 71 inet_frag_destroy(q, f, NULL); 72} 73 74#endif 75