[NETFILTER]: x_tables: add RATEEST target

Add new rate estimator target (using gen_estimator). In combination with
the rateest match (next patch) this can be used for load-based multipath
routing.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 204 insertions, 0 deletions

diff --git a/net/netfilter/xt_RATEEST.c b/net/netfilter/xt_RATEEST.c
new file mode 100644
index 00000000000..c0088839fde
--- /dev/null
+++ b/net/netfilter/xt_RATEEST.c
@@ -0,0 +1,204 @@
+/*
+ * (C) 2007 Patrick McHardy <kaber@trash.net>
+ *
+ * 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.
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/gen_stats.h>
+#include <linux/jhash.h>
+#include <linux/rtnetlink.h>
+#include <linux/random.h>
+#include <net/gen_stats.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_RATEEST.h>
+#include <net/netfilter/xt_rateest.h>
+
+static DEFINE_MUTEX(xt_rateest_mutex);
+
+#define RATEEST_HSIZE	16
+static struct hlist_head rateest_hash[RATEEST_HSIZE] __read_mostly;
+static unsigned int jhash_rnd __read_mostly;
+
+static unsigned int xt_rateest_hash(const char *name)
+{
+	return jhash(name, FIELD_SIZEOF(struct xt_rateest, name), jhash_rnd) &
+	       (RATEEST_HSIZE - 1);
+}
+
+static void xt_rateest_hash_insert(struct xt_rateest *est)
+{
+	unsigned int h;
+
+	h = xt_rateest_hash(est->name);
+	hlist_add_head(&est->list, &rateest_hash[h]);
+}
+
+struct xt_rateest *xt_rateest_lookup(const char *name)
+{
+	struct xt_rateest *est;
+	struct hlist_node *n;
+	unsigned int h;
+
+	h = xt_rateest_hash(name);
+	mutex_lock(&xt_rateest_mutex);
+	hlist_for_each_entry(est, n, &rateest_hash[h], list) {
+		if (strcmp(est->name, name) == 0) {
+			est->refcnt++;
+			mutex_unlock(&xt_rateest_mutex);
+			return est;
+		}
+	}
+	mutex_unlock(&xt_rateest_mutex);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(xt_rateest_lookup);
+
+void xt_rateest_put(struct xt_rateest *est)
+{
+	mutex_lock(&xt_rateest_mutex);
+	if (--est->refcnt == 0) {
+		hlist_del(&est->list);
+		gen_kill_estimator(&est->bstats, &est->rstats);
+		kfree(est);
+	}
+	mutex_unlock(&xt_rateest_mutex);
+}
+EXPORT_SYMBOL_GPL(xt_rateest_put);
+
+static unsigned int
+xt_rateest_tg(struct sk_buff *skb,
+	      const struct net_device *in,
+	      const struct net_device *out,
+	      unsigned int hooknum,
+	      const struct xt_target *target,
+	      const void *targinfo)
+{
+	const struct xt_rateest_target_info *info = targinfo;
+	struct gnet_stats_basic *stats = &info->est->bstats;
+
+	spin_lock_bh(&info->est->lock);
+	stats->bytes += skb->len;
+	stats->packets++;
+	spin_unlock_bh(&info->est->lock);
+
+	return XT_CONTINUE;
+}
+
+static bool
+xt_rateest_tg_checkentry(const char *tablename,
+			 const void *entry,
+			 const struct xt_target *target,
+			 void *targinfo,
+			 unsigned int hook_mask)
+{
+	struct xt_rateest_target_info *info = (void *)targinfo;
+	struct xt_rateest *est;
+	struct {
+		struct rtattr		opt;
+		struct gnet_estimator	est;
+	} cfg;
+
+	est = xt_rateest_lookup(info->name);
+	if (est) {
+		/*
+		 * If estimator parameters are specified, they must match the
+		 * existing estimator.
+		 */
+		if ((!info->interval && !info->ewma_log) ||
+		    (info->interval != est->params.interval ||
+		     info->ewma_log != est->params.ewma_log)) {
+			xt_rateest_put(est);
+			return false;
+		}
+		info->est = est;
+		return true;
+	}
+
+	est = kzalloc(sizeof(*est), GFP_KERNEL);
+	if (!est)
+		goto err1;
+
+	strlcpy(est->name, info->name, sizeof(est->name));
+	spin_lock_init(&est->lock);
+	est->refcnt		= 1;
+	est->params.interval	= info->interval;
+	est->params.ewma_log	= info->ewma_log;
+
+	cfg.opt.rta_len		= RTA_LENGTH(sizeof(cfg.est));
+	cfg.opt.rta_type	= TCA_STATS_RATE_EST;
+	cfg.est.interval	= info->interval;
+	cfg.est.ewma_log	= info->ewma_log;
+
+	if (gen_new_estimator(&est->bstats, &est->rstats, &est->lock,
+			      &cfg.opt) < 0)
+		goto err2;
+
+	info->est = est;
+	xt_rateest_hash_insert(est);
+
+	return true;
+
+err2:
+	kfree(est);
+err1:
+	return false;
+}
+
+static void xt_rateest_tg_destroy(const struct xt_target *target,
+				  void *targinfo)
+{
+	struct xt_rateest_target_info *info = targinfo;
+
+	xt_rateest_put(info->est);
+}
+
+static struct xt_target xt_rateest_target[] __read_mostly = {
+	{
+		.family		= AF_INET,
+		.name		= "RATEEST",
+		.target		= xt_rateest_tg,
+		.checkentry	= xt_rateest_tg_checkentry,
+		.destroy	= xt_rateest_tg_destroy,
+		.targetsize	= sizeof(struct xt_rateest_target_info),
+		.me		= THIS_MODULE,
+	},
+	{
+		.family		= AF_INET6,
+		.name		= "RATEEST",
+		.target		= xt_rateest_tg,
+		.checkentry	= xt_rateest_tg_checkentry,
+		.destroy	= xt_rateest_tg_destroy,
+		.targetsize	= sizeof(struct xt_rateest_target_info),
+		.me		= THIS_MODULE,
+	},
+};
+
+static int __init xt_rateest_tg_init(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(rateest_hash); i++)
+		INIT_HLIST_HEAD(&rateest_hash[i]);
+
+	get_random_bytes(&jhash_rnd, sizeof(jhash_rnd));
+	return xt_register_targets(xt_rateest_target,
+				   ARRAY_SIZE(xt_rateest_target));
+}
+
+static void __exit xt_rateest_tg_fini(void)
+{
+	xt_unregister_targets(xt_rateest_target, ARRAY_SIZE(xt_rateest_target));
+}
+
+
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("xtables rate estimator");
+MODULE_ALIAS("ipt_RATEEST");
+MODULE_ALIAS("ip6t_RATEEST");
+module_init(xt_rateest_tg_init);
+module_exit(xt_rateest_tg_fini);