[linux-2.6-block.git] / net / netfilter / nft_counter.c

/*
 * 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_regs *regs,
			     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,
	.flags		= NFT_EXPR_STATEFUL,
	.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");
Commit	Line	Data
96518518	1	/*
ef1f7df9	2	* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
96518518 PM	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* Development of this code funded by Astaro AG (http://www.astaro.com/)
	9	*/
	10
	11	#include <linux/kernel.h>
	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/seqlock.h>
	15	#include <linux/netlink.h>
	16	#include <linux/netfilter.h>
	17	#include <linux/netfilter/nf_tables.h>
	18	#include <net/netfilter/nf_tables.h>
	19
	20	struct nft_counter {
	21	seqlock_t lock;
	22	u64 bytes;
	23	u64 packets;
	24	};
	25
	26	static void nft_counter_eval(const struct nft_expr *expr,
a55e22e9	27	struct nft_regs *regs,
96518518 PM	28	const struct nft_pktinfo *pkt)
	29	{
	30	struct nft_counter *priv = nft_expr_priv(expr);
	31
	32	write_seqlock_bh(&priv->lock);
	33	priv->bytes += pkt->skb->len;
	34	priv->packets++;
	35	write_sequnlock_bh(&priv->lock);
	36	}
	37
	38	static int nft_counter_dump(struct sk_buff skb, const struct nft_expr expr)
	39	{
	40	struct nft_counter *priv = nft_expr_priv(expr);
	41	unsigned int seq;
	42	u64 bytes;
	43	u64 packets;
	44
	45	do {
	46	seq = read_seqbegin(&priv->lock);
	47	bytes = priv->bytes;
	48	packets = priv->packets;
	49	} while (read_seqretry(&priv->lock, seq));
	50
	51	if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(bytes)))
	52	goto nla_put_failure;
	53	if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(packets)))
	54	goto nla_put_failure;
	55	return 0;
	56
	57	nla_put_failure:
	58	return -1;
	59	}
	60
	61	static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
	62	[NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
	63	[NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
	64	};
	65
	66	static int nft_counter_init(const struct nft_ctx *ctx,
	67	const struct nft_expr *expr,
	68	const struct nlattr * const tb[])
	69	{
	70	struct nft_counter *priv = nft_expr_priv(expr);
	71
	72	if (tb[NFTA_COUNTER_PACKETS])
	73	priv->packets = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
	74	if (tb[NFTA_COUNTER_BYTES])
	75	priv->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
	76
	77	seqlock_init(&priv->lock);
	78	return 0;
	79	}
	80
ef1f7df9 PM	81	static struct nft_expr_type nft_counter_type;
	82	static const struct nft_expr_ops nft_counter_ops = {
	83	.type = &nft_counter_type,
96518518	84	.size = NFT_EXPR_SIZE(sizeof(struct nft_counter)),
96518518 PM	85	.eval = nft_counter_eval,
	86	.init = nft_counter_init,
	87	.dump = nft_counter_dump,
	88	};
	89
ef1f7df9 PM	90	static struct nft_expr_type nft_counter_type __read_mostly = {
	91	.name = "counter",
	92	.ops = &nft_counter_ops,
	93	.policy = nft_counter_policy,
	94	.maxattr = NFTA_COUNTER_MAX,
151d799a	95	.flags = NFT_EXPR_STATEFUL,
ef1f7df9 PM	96	.owner = THIS_MODULE,
	97	};
	98
96518518 PM	99	static int __init nft_counter_module_init(void)
96518518 PM	100	{
ef1f7df9	101	return nft_register_expr(&nft_counter_type);
96518518 PM	102	}
	103
	104	static void __exit nft_counter_module_exit(void)
	105	{
ef1f7df9	106	nft_unregister_expr(&nft_counter_type);
96518518 PM	107	}
	108
	109	module_init(nft_counter_module_init);
	110	module_exit(nft_counter_module_exit);
	111
	112	MODULE_LICENSE("GPL");
	113	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	114	MODULE_ALIAS_NFT_EXPR("counter");