root/include/net/inet_frag.h

INCLUDED FROM

DEFINITIONS

1. inet_frag_put

#ifndef __NET_FRAG_H__
#define __NET_FRAG_H__

struct netns_frags {
        int                     nqueues;
        atomic_t                mem;
        struct list_head        lru_list;

        /* sysctls */
        int                     timeout;
        int                     high_thresh;
        int                     low_thresh;
};

struct inet_frag_queue {
        struct hlist_node       list;
        struct netns_frags      *net;
        struct list_head        lru_list;   /* lru list member */
        spinlock_t              lock;
        atomic_t                refcnt;
        struct timer_list       timer;      /* when will this queue expire? */
        struct sk_buff          *fragments; /* list of received fragments */
        ktime_t                 stamp;
        int                     len;        /* total length of orig datagram */
        int                     meat;
        __u8                    last_in;    /* first/last segment arrived? */

#define INET_FRAG_COMPLETE      4
#define INET_FRAG_FIRST_IN      2
#define INET_FRAG_LAST_IN       1
};

#define INETFRAGS_HASHSZ                64

struct inet_frags {
        struct hlist_head       hash[INETFRAGS_HASHSZ];
        rwlock_t                lock;
        u32                     rnd;
        int                     qsize;
        int                     secret_interval;
        struct timer_list       secret_timer;

        unsigned int            (*hashfn)(struct inet_frag_queue *);
        void                    (*constructor)(struct inet_frag_queue *q,
                                                void *arg);
        void                    (*destructor)(struct inet_frag_queue *);
        void                    (*skb_free)(struct sk_buff *);
        int                     (*match)(struct inet_frag_queue *q,
                                                void *arg);
        void                    (*frag_expire)(unsigned long data);
};

void inet_frags_init(struct inet_frags *);
void inet_frags_fini(struct inet_frags *);

void inet_frags_init_net(struct netns_frags *nf);
void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f);

void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
void inet_frag_destroy(struct inet_frag_queue *q,
                                struct inet_frags *f, int *work);
int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f);
struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
                struct inet_frags *f, void *key, unsigned int hash);

static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
{
        if (atomic_dec_and_test(&q->refcnt))
                inet_frag_destroy(q, f, NULL);
}

#endif