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
ip_set_timeout_uget(struct nlattr * tb)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
ip_set_timeout_test(unsigned long timeout)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
ip_set_timeout_expired(unsigned long * timeout)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
ip_set_timeout_set(unsigned long * timeout,u32 t)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
ip_set_timeout_get(unsigned long * timeout)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 */
79