2588fe1d78
This routine checks for the existence of a given entry in the hash table and inserts the new one if needed. The ->equal callback is used to compare two frag_queue-s together, but this one is temporary and will be removed later. The netfilter code and the ipv6 one use the same routine to compare frags. The inet_frag_intern() always returns non-NULL pointer, so convert the inet_frag_queue into protocol specific one (with the container_of) without any checks. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
#ifndef __NET_FRAG_H__
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#define __NET_FRAG_H__
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struct inet_frag_queue {
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struct hlist_node list;
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struct list_head lru_list; /* lru list member */
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spinlock_t lock;
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atomic_t refcnt;
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struct timer_list timer; /* when will this queue expire? */
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struct sk_buff *fragments; /* list of received fragments */
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ktime_t stamp;
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int len; /* total length of orig datagram */
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int meat;
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__u8 last_in; /* first/last segment arrived? */
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#define COMPLETE 4
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#define FIRST_IN 2
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#define LAST_IN 1
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};
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#define INETFRAGS_HASHSZ 64
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struct inet_frags_ctl {
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int high_thresh;
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int low_thresh;
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int timeout;
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int secret_interval;
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};
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struct inet_frags {
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struct list_head lru_list;
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struct hlist_head hash[INETFRAGS_HASHSZ];
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rwlock_t lock;
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u32 rnd;
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int nqueues;
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int qsize;
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atomic_t mem;
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struct timer_list secret_timer;
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struct inet_frags_ctl *ctl;
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unsigned int (*hashfn)(struct inet_frag_queue *);
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void (*destructor)(struct inet_frag_queue *);
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void (*skb_free)(struct sk_buff *);
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int (*equal)(struct inet_frag_queue *q1,
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struct inet_frag_queue *q2);
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};
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void inet_frags_init(struct inet_frags *);
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void inet_frags_fini(struct inet_frags *);
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void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
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void inet_frag_destroy(struct inet_frag_queue *q,
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struct inet_frags *f, int *work);
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int inet_frag_evictor(struct inet_frags *f);
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struct inet_frag_queue *inet_frag_intern(struct inet_frag_queue *q,
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struct inet_frags *f, unsigned int hash);
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static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
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{
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if (atomic_dec_and_test(&q->refcnt))
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inet_frag_destroy(q, f, NULL);
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}
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#endif
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