include/linux/netfilter/ipset/ip_set_timeout.h

   1 #ifndef _IP_SET_TIMEOUT_H
   2 #define _IP_SET_TIMEOUT_H
   3
   4 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #ifdef __KERNEL__
  12
  13 /* How often should the gc be run by default */
  14 #define IPSET_GC_TIME                   (3 * 60)
  15
  16 /* Timeout period depending on the timeout value of the given set */
  17 #define IPSET_GC_PERIOD(timeout) \
  18         ((timeout/3) ? min_t(u32, (timeout)/3, IPSET_GC_TIME) : 1)
  19
  20 /* Entry is set with no timeout value */
  21 #define IPSET_ELEM_PERMANENT    0
  22
  23 /* Set is defined with timeout support: timeout value may be 0 */
  24 #define IPSET_NO_TIMEOUT        UINT_MAX
  25
  26 #define ip_set_adt_opt_timeout(opt, set)        \
  27 ((opt)->ext.timeout != IPSET_NO_TIMEOUT ? (opt)->ext.timeout : (set)->timeout)
  28
  29 static inline unsigned int
  30 ip_set_timeout_uget(struct nlattr *tb)
  31 {
  32         unsigned int timeout = ip_set_get_h32(tb);
  33
  34         /* Normalize to fit into jiffies */
  35         if (timeout > UINT_MAX/MSEC_PER_SEC)
  36                 timeout = UINT_MAX/MSEC_PER_SEC;
  37
  38         /* Userspace supplied TIMEOUT parameter: adjust crazy size */
  39         return timeout == IPSET_NO_TIMEOUT ? IPSET_NO_TIMEOUT - 1 : timeout;
  40 }
  41
  42 static inline bool
  43 ip_set_timeout_test(unsigned long timeout)
  44 {
  45         return timeout == IPSET_ELEM_PERMANENT ||
  46                time_is_after_jiffies(timeout);
  47 }
  48
  49 static inline bool
  50 ip_set_timeout_expired(unsigned long *timeout)
  51 {
  52         return *timeout != IPSET_ELEM_PERMANENT &&
  53                time_is_before_jiffies(*timeout);
  54 }
  55
  56 static inline void
  57 ip_set_timeout_set(unsigned long *timeout, u32 t)
  58 {
  59         if (!t) {
  60                 *timeout = IPSET_ELEM_PERMANENT;
  61                 return;
  62         }
  63
  64         *timeout = msecs_to_jiffies(t * 1000) + jiffies;
  65         if (*timeout == IPSET_ELEM_PERMANENT)
  66                 /* Bingo! :-) */
  67                 (*timeout)--;
  68 }
  69
  70 static inline u32
  71 ip_set_timeout_get(unsigned long *timeout)
  72 {
  73         return *timeout == IPSET_ELEM_PERMANENT ? 0 :
  74                 jiffies_to_msecs(*timeout - jiffies)/1000;
  75 }
  76
  77 #endif  /* __KERNEL__ */
  78 #endif /* _IP_SET_TIMEOUT_H */