-/* Kernel module to control the rate
- *
- * 2 September 1999: Changed from the target RATE to the match
- * `limit', removed logging. Did I mention that
- * Alexey is a fucking genius?
- * Rusty Russell (rusty@rustcorp.com.au). */
-
-/* (C) 1999 Jérôme de Vivie <devivie@info.enserb.u-bordeaux.fr>
- * (C) 1999 Hervé Eychenne <eychenne@info.enserb.u-bordeaux.fr>
+/* (C) 1999 Jérôme de Vivie <devivie@info.enserb.u-bordeaux.fr>
+ * (C) 1999 Hervé Eychenne <eychenne@info.enserb.u-bordeaux.fr>
*
* 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
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Herve Eychenne <rv@wallfire.org>");
-MODULE_DESCRIPTION("iptables rate limit match");
+MODULE_DESCRIPTION("Xtables: rate-limit match");
MODULE_ALIAS("ipt_limit");
MODULE_ALIAS("ip6t_limit");
#define CREDITS_PER_JIFFY POW2_BELOW32(MAX_CPJ)
-static int
-ipt_limit_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
+limit_mt(const struct sk_buff *skb, const struct xt_match_param *par)
{
- struct xt_rateinfo *r = ((struct xt_rateinfo *)matchinfo)->master;
+ struct xt_rateinfo *r =
+ ((const struct xt_rateinfo *)par->matchinfo)->master;
unsigned long now = jiffies;
spin_lock_bh(&limit_lock);
/* We're not limited. */
r->credit -= r->cost;
spin_unlock_bh(&limit_lock);
- return 1;
+ return true;
}
- spin_unlock_bh(&limit_lock);
- return 0;
+ spin_unlock_bh(&limit_lock);
+ return false;
}
/* Precision saver. */
return (user * HZ * CREDITS_PER_JIFFY) / XT_LIMIT_SCALE;
}
-static int
-ipt_limit_checkentry(const char *tablename,
- const void *inf,
- const struct xt_match *match,
- void *matchinfo,
- unsigned int hook_mask)
+static bool limit_mt_check(const struct xt_mtchk_param *par)
{
- struct xt_rateinfo *r = matchinfo;
+ struct xt_rateinfo *r = par->matchinfo;
/* Check for overflow. */
if (r->burst == 0
|| user2credits(r->avg * r->burst) < user2credits(r->avg)) {
printk("Overflow in xt_limit, try lower: %u/%u\n",
r->avg, r->burst);
- return 0;
+ return false;
}
/* For SMP, we only want to use one set of counters. */
r->credit_cap = user2credits(r->avg * r->burst); /* Credits full. */
r->cost = user2credits(r->avg);
}
- return 1;
+ return true;
}
-static struct xt_match xt_limit_match[] = {
- {
- .name = "limit",
- .family = AF_INET,
- .checkentry = ipt_limit_checkentry,
- .match = ipt_limit_match,
- .matchsize = sizeof(struct xt_rateinfo),
- .me = THIS_MODULE,
- },
- {
- .name = "limit",
- .family = AF_INET6,
- .checkentry = ipt_limit_checkentry,
- .match = ipt_limit_match,
- .matchsize = sizeof(struct xt_rateinfo),
- .me = THIS_MODULE,
- },
+#ifdef CONFIG_COMPAT
+struct compat_xt_rateinfo {
+ u_int32_t avg;
+ u_int32_t burst;
+
+ compat_ulong_t prev;
+ u_int32_t credit;
+ u_int32_t credit_cap, cost;
+
+ u_int32_t master;
+};
+
+/* To keep the full "prev" timestamp, the upper 32 bits are stored in the
+ * master pointer, which does not need to be preserved. */
+static void limit_mt_compat_from_user(void *dst, void *src)
+{
+ const struct compat_xt_rateinfo *cm = src;
+ struct xt_rateinfo m = {
+ .avg = cm->avg,
+ .burst = cm->burst,
+ .prev = cm->prev | (unsigned long)cm->master << 32,
+ .credit = cm->credit,
+ .credit_cap = cm->credit_cap,
+ .cost = cm->cost,
+ };
+ memcpy(dst, &m, sizeof(m));
+}
+
+static int limit_mt_compat_to_user(void __user *dst, void *src)
+{
+ const struct xt_rateinfo *m = src;
+ struct compat_xt_rateinfo cm = {
+ .avg = m->avg,
+ .burst = m->burst,
+ .prev = m->prev,
+ .credit = m->credit,
+ .credit_cap = m->credit_cap,
+ .cost = m->cost,
+ .master = m->prev >> 32,
+ };
+ return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0;
+}
+#endif /* CONFIG_COMPAT */
+
+static struct xt_match limit_mt_reg __read_mostly = {
+ .name = "limit",
+ .revision = 0,
+ .family = NFPROTO_UNSPEC,
+ .match = limit_mt,
+ .checkentry = limit_mt_check,
+ .matchsize = sizeof(struct xt_rateinfo),
+#ifdef CONFIG_COMPAT
+ .compatsize = sizeof(struct compat_xt_rateinfo),
+ .compat_from_user = limit_mt_compat_from_user,
+ .compat_to_user = limit_mt_compat_to_user,
+#endif
+ .me = THIS_MODULE,
};
-static int __init xt_limit_init(void)
+static int __init limit_mt_init(void)
{
- return xt_register_matches(xt_limit_match, ARRAY_SIZE(xt_limit_match));
+ return xt_register_match(&limit_mt_reg);
}
-static void __exit xt_limit_fini(void)
+static void __exit limit_mt_exit(void)
{
- xt_unregister_matches(xt_limit_match, ARRAY_SIZE(xt_limit_match));
+ xt_unregister_match(&limit_mt_reg);
}
-module_init(xt_limit_init);
-module_exit(xt_limit_fini);
+module_init(limit_mt_init);
+module_exit(limit_mt_exit);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff