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 76