netfilter: ipset: bitmap:ip set type support

[karo-tx-linux.git] / include / linux / netfilter / ipset / ip_set_timeout.h

diff --git a/include/linux/netfilter/ipset/ip_set_timeout.h b/include/linux/netfilter/ipset/ip_set_timeout.h
new file mode 100644 (file)
index 0000000..9f30c5f
--- /dev/null
+++ b/include/linux/netfilter/ipset/ip_set_timeout.h
@@ -0,0 +1,127 @@
+#ifndef _IP_SET_TIMEOUT_H
+#define _IP_SET_TIMEOUT_H
+
+/* Copyright (C) 2003-2011 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)
+
+/* Set is defined without timeout support: timeout value may be 0 */
+#define IPSET_NO_TIMEOUT       UINT_MAX
+
+#define with_timeout(timeout)  ((timeout) != IPSET_NO_TIMEOUT)
+
+static inline unsigned int
+ip_set_timeout_uget(struct nlattr *tb)
+{
+       unsigned int timeout = ip_set_get_h32(tb);
+
+       /* Userspace supplied TIMEOUT parameter: adjust crazy size */
+       return timeout == IPSET_NO_TIMEOUT ? IPSET_NO_TIMEOUT - 1 : timeout;
+}
+
+#ifdef IP_SET_BITMAP_TIMEOUT
+
+/* Bitmap specific timeout constants and macros for the entries */
+
+/* Bitmap entry is unset */
+#define IPSET_ELEM_UNSET       0
+/* Bitmap entry is set with no timeout value */
+#define IPSET_ELEM_PERMANENT   (UINT_MAX/2)
+
+static inline bool
+ip_set_timeout_test(unsigned long timeout)
+{
+       return timeout != IPSET_ELEM_UNSET &&
+              (timeout == IPSET_ELEM_PERMANENT ||
+               time_after(timeout, jiffies));
+}
+
+static inline bool
+ip_set_timeout_expired(unsigned long timeout)
+{
+       return timeout != IPSET_ELEM_UNSET &&
+              timeout != IPSET_ELEM_PERMANENT &&
+              time_before(timeout, jiffies);
+}
+
+static inline unsigned long
+ip_set_timeout_set(u32 timeout)
+{
+       unsigned long t;
+
+       if (!timeout)
+               return IPSET_ELEM_PERMANENT;
+
+       t = timeout * HZ + jiffies;
+       if (t == IPSET_ELEM_UNSET || t == IPSET_ELEM_PERMANENT)
+               /* Bingo! */
+               t++;
+
+       return t;
+}
+
+static inline u32
+ip_set_timeout_get(unsigned long timeout)
+{
+       return timeout == IPSET_ELEM_PERMANENT ? 0 : (timeout - jiffies)/HZ;
+}
+
+#else
+
+/* Hash specific timeout constants and macros for the entries */
+
+/* Hash entry is set with no timeout value */
+#define IPSET_ELEM_PERMANENT   0
+
+static inline bool
+ip_set_timeout_test(unsigned long timeout)
+{
+       return timeout == IPSET_ELEM_PERMANENT ||
+              time_after(timeout, jiffies);
+}
+
+static inline bool
+ip_set_timeout_expired(unsigned long timeout)
+{
+       return timeout != IPSET_ELEM_PERMANENT &&
+              time_before(timeout, jiffies);
+}
+
+static inline unsigned long
+ip_set_timeout_set(u32 timeout)
+{
+       unsigned long t;
+
+       if (!timeout)
+               return IPSET_ELEM_PERMANENT;
+
+       t = timeout * HZ + jiffies;
+       if (t == IPSET_ELEM_PERMANENT)
+               /* Bingo! :-) */
+               t++;
+
+       return t;
+}
+
+static inline u32
+ip_set_timeout_get(unsigned long timeout)
+{
+       return timeout == IPSET_ELEM_PERMANENT ? 0 : (timeout - jiffies)/HZ;
+}
+#endif /* ! IP_SET_BITMAP_TIMEOUT */
+
+#endif /* __KERNEL__ */
+
+#endif /* _IP_SET_TIMEOUT_H */