MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
-MODULE_DESCRIPTION("xtables statistical match module");
+MODULE_DESCRIPTION("Xtables: statistics-based matching (\"Nth\", random)");
MODULE_ALIAS("ipt_statistic");
MODULE_ALIAS("ip6t_statistic");
static DEFINE_SPINLOCK(nth_lock);
-static int
-match(const struct sk_buff *skb,
- const struct net_device *in, const struct net_device *out,
- const struct xt_match *match, const void *matchinfo,
- int offset, unsigned int protoff, int *hotdrop)
+static bool
+statistic_mt(const struct sk_buff *skb, const struct net_device *in,
+ const struct net_device *out, const struct xt_match *match,
+ const void *matchinfo, int offset, unsigned int protoff,
+ bool *hotdrop)
{
struct xt_statistic_info *info = (struct xt_statistic_info *)matchinfo;
- int ret = info->flags & XT_STATISTIC_INVERT ? 1 : 0;
+ bool ret = info->flags & XT_STATISTIC_INVERT;
switch (info->mode) {
case XT_STATISTIC_MODE_RANDOM:
if ((net_random() & 0x7FFFFFFF) < info->u.random.probability)
- ret ^= 1;
+ ret = !ret;
break;
case XT_STATISTIC_MODE_NTH:
info = info->master;
spin_lock_bh(&nth_lock);
if (info->u.nth.count++ == info->u.nth.every) {
info->u.nth.count = 0;
- ret ^= 1;
+ ret = !ret;
}
spin_unlock_bh(&nth_lock);
break;
return ret;
}
-static int
-checkentry(const char *tablename, const void *entry,
- const struct xt_match *match, void *matchinfo,
- unsigned int matchsize, unsigned int hook_mask)
+static bool
+statistic_mt_check(const char *tablename, const void *entry,
+ const struct xt_match *match, void *matchinfo,
+ unsigned int hook_mask)
{
- struct xt_statistic_info *info = (struct xt_statistic_info *)matchinfo;
+ struct xt_statistic_info *info = matchinfo;
if (info->mode > XT_STATISTIC_MODE_MAX ||
info->flags & ~XT_STATISTIC_MASK)
- return 0;
+ return false;
info->master = info;
- return 1;
+ return true;
}
-static struct xt_match statistic_match = {
- .name = "statistic",
- .match = match,
- .matchsize = sizeof(struct xt_statistic_info),
- .checkentry = checkentry,
- .family = AF_INET,
- .me = THIS_MODULE,
-};
-
-static struct xt_match statistic_match6 = {
- .name = "statistic",
- .match = match,
- .matchsize = sizeof(struct xt_statistic_info),
- .checkentry = checkentry,
- .family = AF_INET6,
- .me = THIS_MODULE,
+static struct xt_match statistic_mt_reg[] __read_mostly = {
+ {
+ .name = "statistic",
+ .family = AF_INET,
+ .checkentry = statistic_mt_check,
+ .match = statistic_mt,
+ .matchsize = sizeof(struct xt_statistic_info),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "statistic",
+ .family = AF_INET6,
+ .checkentry = statistic_mt_check,
+ .match = statistic_mt,
+ .matchsize = sizeof(struct xt_statistic_info),
+ .me = THIS_MODULE,
+ },
};
-static int __init xt_statistic_init(void)
+static int __init statistic_mt_init(void)
{
- int ret;
-
- ret = xt_register_match(&statistic_match);
- if (ret)
- goto err1;
-
- ret = xt_register_match(&statistic_match6);
- if (ret)
- goto err2;
- return ret;
-err2:
- xt_unregister_match(&statistic_match);
-err1:
- return ret;
+ return xt_register_matches(statistic_mt_reg,
+ ARRAY_SIZE(statistic_mt_reg));
}
-static void __exit xt_statistic_fini(void)
+static void __exit statistic_mt_exit(void)
{
- xt_unregister_match(&statistic_match6);
- xt_unregister_match(&statistic_match);
+ xt_unregister_matches(statistic_mt_reg,
+ ARRAY_SIZE(statistic_mt_reg));
}
-module_init(xt_statistic_init);
-module_exit(xt_statistic_fini);
+module_init(statistic_mt_init);
+module_exit(statistic_mt_exit);