root/include/linux/netfilter/ipset/ip_set_timeout.h

INCLUDED FROM

DEFINITIONS

1. ip_set_timeout_uget
2. ip_set_timeout_test
3. ip_set_timeout_expired
4. ip_set_timeout_set
5. ip_set_timeout_get

#ifndef _IP_SET_TIMEOUT_H
#define _IP_SET_TIMEOUT_H

/* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifdef __KERNEL__

/* How often should the gc be run by default */
#define IPSET_GC_TIME                   (3 * 60)

/* Timeout period depending on the timeout value of the given set */
#define IPSET_GC_PERIOD(timeout) \
        ((timeout/3) ? min_t(u32, (timeout)/3, IPSET_GC_TIME) : 1)

/* Entry is set with no timeout value */
#define IPSET_ELEM_PERMANENT    0

/* Set is defined with timeout support: timeout value may be 0 */
#define IPSET_NO_TIMEOUT        UINT_MAX

#define ip_set_adt_opt_timeout(opt, set)        \
((opt)->ext.timeout != IPSET_NO_TIMEOUT ? (opt)->ext.timeout : (set)->timeout)

static inline unsigned int
ip_set_timeout_uget(struct nlattr *tb)
{
        unsigned int timeout = ip_set_get_h32(tb);

        /* Normalize to fit into jiffies */
        if (timeout > UINT_MAX/MSEC_PER_SEC)
                timeout = UINT_MAX/MSEC_PER_SEC;

        /* Userspace supplied TIMEOUT parameter: adjust crazy size */
        return timeout == IPSET_NO_TIMEOUT ? IPSET_NO_TIMEOUT - 1 : timeout;
}

static inline bool
ip_set_timeout_test(unsigned long timeout)
{
        return timeout == IPSET_ELEM_PERMANENT ||
               time_is_after_jiffies(timeout);
}

static inline bool
ip_set_timeout_expired(unsigned long *timeout)
{
        return *timeout != IPSET_ELEM_PERMANENT &&
               time_is_before_jiffies(*timeout);
}

static inline void
ip_set_timeout_set(unsigned long *timeout, u32 t)
{
        if (!t) {
                *timeout = IPSET_ELEM_PERMANENT;
                return;
        }

        *timeout = msecs_to_jiffies(t * 1000) + jiffies;
        if (*timeout == IPSET_ELEM_PERMANENT)
                /* Bingo! :-) */
                (*timeout)--;
}

static inline u32
ip_set_timeout_get(unsigned long *timeout)
{
        return *timeout == IPSET_ELEM_PERMANENT ? 0 :
                jiffies_to_msecs(*timeout - jiffies)/1000;
}

#endif  /* __KERNEL__ */
#endif /* _IP_SET_TIMEOUT_H */