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 /* Max timeout value, see msecs_to_jiffies() in jiffies.h */ 27 #define IPSET_MAX_TIMEOUT (UINT_MAX >> 1)/MSEC_PER_SEC 28 29 #define ip_set_adt_opt_timeout(opt, set) \ 30 ((opt)->ext.timeout != IPSET_NO_TIMEOUT ? (opt)->ext.timeout : (set)->timeout) 31 32 static inline unsigned int ip_set_timeout_uget(struct nlattr * tb)33ip_set_timeout_uget(struct nlattr *tb) 34 { 35 unsigned int timeout = ip_set_get_h32(tb); 36 37 /* Normalize to fit into jiffies */ 38 if (timeout > IPSET_MAX_TIMEOUT) 39 timeout = IPSET_MAX_TIMEOUT; 40 41 return timeout; 42 } 43 44 static inline bool ip_set_timeout_expired(const unsigned long * t)45ip_set_timeout_expired(const unsigned long *t) 46 { 47 return *t != IPSET_ELEM_PERMANENT && time_is_before_jiffies(*t); 48 } 49 50 static inline void ip_set_timeout_set(unsigned long * timeout,u32 value)51ip_set_timeout_set(unsigned long *timeout, u32 value) 52 { 53 unsigned long t; 54 55 if (!value) { 56 *timeout = IPSET_ELEM_PERMANENT; 57 return; 58 } 59 60 t = msecs_to_jiffies(value * MSEC_PER_SEC) + jiffies; 61 if (t == IPSET_ELEM_PERMANENT) 62 /* Bingo! :-) */ 63 t--; 64 *timeout = t; 65 } 66 67 static inline u32 ip_set_timeout_get(const unsigned long * timeout)68ip_set_timeout_get(const unsigned long *timeout) 69 { 70 u32 t; 71 72 if (*timeout == IPSET_ELEM_PERMANENT) 73 return 0; 74 75 t = jiffies_to_msecs(*timeout - jiffies)/MSEC_PER_SEC; 76 /* Zero value in userspace means no timeout */ 77 return t == 0 ? 1 : t; 78 } 79 80 #endif /* __KERNEL__ */ 81 #endif /* _IP_SET_TIMEOUT_H */ 82
