inet_frag.h

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#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 */
    struct sk_buff      *fragments_tail;
    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

    u16         max_size;
};

#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 *);
    bool            (*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, bool force);
struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
        struct inet_frags *f, void *key, unsigned int hash)
    __releases(&f->lock);

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