1 files changed, 113 insertions, 0 deletions
diff --git a/net/netfilter/nft_counter.c b/net/netfilter/nft_counter.c
new file mode 100644
index 000000000000..c89ee486ce54
--- /dev/null
+++ b/net/netfilter/nft_counter.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2008-2009 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.
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/seqlock.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+
+struct nft_counter {
+	seqlock_t	lock;
+	u64		bytes;
+	u64		packets;
+};
+
+static void nft_counter_eval(const struct nft_expr *expr,
+			     struct nft_data data[NFT_REG_MAX + 1],
+			     const struct nft_pktinfo *pkt)
+{
+	struct nft_counter *priv = nft_expr_priv(expr);
+
+	write_seqlock_bh(&priv->lock);
+	priv->bytes += pkt->skb->len;
+	priv->packets++;
+	write_sequnlock_bh(&priv->lock);
+}
+
+static int nft_counter_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+	struct nft_counter *priv = nft_expr_priv(expr);
+	unsigned int seq;
+	u64 bytes;
+	u64 packets;
+
+	do {
+		seq = read_seqbegin(&priv->lock);
+		bytes	= priv->bytes;
+		packets	= priv->packets;
+	} while (read_seqretry(&priv->lock, seq));
+
+	if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(bytes)))
+		goto nla_put_failure;
+	if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(packets)))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
+	[NFTA_COUNTER_PACKETS]	= { .type = NLA_U64 },
+	[NFTA_COUNTER_BYTES]	= { .type = NLA_U64 },
+};
+
+static int nft_counter_init(const struct nft_ctx *ctx,
+			    const struct nft_expr *expr,
+			    const struct nlattr * const tb[])
+{
+	struct nft_counter *priv = nft_expr_priv(expr);
+
+	if (tb[NFTA_COUNTER_PACKETS])
+	        priv->packets = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
+	if (tb[NFTA_COUNTER_BYTES])
+		priv->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
+
+	seqlock_init(&priv->lock);
+	return 0;
+}
+
+static struct nft_expr_type nft_counter_type;
+static const struct nft_expr_ops nft_counter_ops = {
+	.type		= &nft_counter_type,
+	.size		= NFT_EXPR_SIZE(sizeof(struct nft_counter)),
+	.eval		= nft_counter_eval,
+	.init		= nft_counter_init,
+	.dump		= nft_counter_dump,
+};
+
+static struct nft_expr_type nft_counter_type __read_mostly = {
+	.name		= "counter",
+	.ops		= &nft_counter_ops,
+	.policy		= nft_counter_policy,
+	.maxattr	= NFTA_COUNTER_MAX,
+	.owner		= THIS_MODULE,
+};
+
+static int __init nft_counter_module_init(void)
+{
+	return nft_register_expr(&nft_counter_type);
+}
+
+static void __exit nft_counter_module_exit(void)
+{
+	nft_unregister_expr(&nft_counter_type);
+}
+
+module_init(nft_counter_module_init);
+module_exit(nft_counter_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_ALIAS_NFT_EXPR("counter");