root/include/net/netfilter/nf_conntrack_timeout.h

DEFINITIONS

1. nf_ct_timeout_find
2. nf_ct_timeout_ext_add
3. nf_ct_timeout_lookup
4. nf_conntrack_timeout_init
5. nf_conntrack_timeout_fini

#ifndef _NF_CONNTRACK_TIMEOUT_H
#define _NF_CONNTRACK_TIMEOUT_H

#include <net/net_namespace.h>
#include <linux/netfilter/nf_conntrack_common.h>
#include <linux/netfilter/nf_conntrack_tuple_common.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_extend.h>

#define CTNL_TIMEOUT_NAME_MAX   32

struct ctnl_timeout {
        struct list_head        head;
        struct rcu_head         rcu_head;
        atomic_t                refcnt;
        char                    name[CTNL_TIMEOUT_NAME_MAX];
        __u16                   l3num;
        struct nf_conntrack_l4proto *l4proto;
        char                    data[0];
};

struct nf_conn_timeout {
        struct ctnl_timeout     *timeout;
};

#define NF_CT_TIMEOUT_EXT_DATA(__t) (unsigned int *) &((__t)->timeout->data)

static inline
struct nf_conn_timeout *nf_ct_timeout_find(const struct nf_conn *ct)
{
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
        return nf_ct_ext_find(ct, NF_CT_EXT_TIMEOUT);
#else
        return NULL;
#endif
}

static inline
struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
                                              struct ctnl_timeout *timeout,
                                              gfp_t gfp)
{
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
        struct nf_conn_timeout *timeout_ext;

        timeout_ext = nf_ct_ext_add(ct, NF_CT_EXT_TIMEOUT, gfp);
        if (timeout_ext == NULL)
                return NULL;

        timeout_ext->timeout = timeout;

        return timeout_ext;
#else
        return NULL;
#endif
};

static inline unsigned int *
nf_ct_timeout_lookup(struct net *net, struct nf_conn *ct,
                     struct nf_conntrack_l4proto *l4proto)
{
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
        struct nf_conn_timeout *timeout_ext;
        unsigned int *timeouts;

        timeout_ext = nf_ct_timeout_find(ct);
        if (timeout_ext)
                timeouts = NF_CT_TIMEOUT_EXT_DATA(timeout_ext);
        else
                timeouts = l4proto->get_timeouts(net);

        return timeouts;
#else
        return l4proto->get_timeouts(net);
#endif
}

#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
int nf_conntrack_timeout_init(void);
void nf_conntrack_timeout_fini(void);
#else
static inline int nf_conntrack_timeout_init(void)
{
        return 0;
}

static inline void nf_conntrack_timeout_fini(void)
{
        return;
}
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */

#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
extern struct ctnl_timeout *(*nf_ct_timeout_find_get_hook)(const char *name);
extern void (*nf_ct_timeout_put_hook)(struct ctnl_timeout *timeout);
#endif

#endif /* _NF_CONNTRACK_TIMEOUT_H */