nf_conntrack_timeout.h

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#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
extern int nf_conntrack_timeout_init(struct net *net);
extern void nf_conntrack_timeout_fini(struct net *net);
#else
static inline int nf_conntrack_timeout_init(struct net *net)
{
        return 0;
}

static inline void nf_conntrack_timeout_fini(struct net *net)
{
        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 */