[mirror_ubuntu-bionic-kernel.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 {
	u64		bytes;
	u64		packets;
};

struct nft_counter_percpu {
	struct nft_counter	counter;
	struct u64_stats_sync	syncp;
};

struct nft_counter_percpu_priv {
	struct nft_counter_percpu __percpu *counter;
};

static void nft_counter_eval(const struct nft_expr *expr,
			     struct nft_regs *regs,
			     const struct nft_pktinfo *pkt)
{
	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
	struct nft_counter_percpu *this_cpu;

	local_bh_disable();
	this_cpu = this_cpu_ptr(priv->counter);
	u64_stats_update_begin(&this_cpu->syncp);
	this_cpu->counter.bytes += pkt->skb->len;
	this_cpu->counter.packets++;
	u64_stats_update_end(&this_cpu->syncp);
	local_bh_enable();
}

static int nft_counter_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
	struct nft_counter_percpu *cpu_stats;
	struct nft_counter total;
	u64 bytes, packets;
	unsigned int seq;
	int cpu;

	memset(&total, 0, sizeof(total));
	for_each_possible_cpu(cpu) {
		cpu_stats = per_cpu_ptr(priv->counter, cpu);
		do {
			seq	= u64_stats_fetch_begin_irq(&cpu_stats->syncp);
			bytes	= cpu_stats->counter.bytes;
			packets	= cpu_stats->counter.packets;
		} while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));

		total.packets += packets;
		total.bytes += bytes;
	}

	if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)) ||
	    nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.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_percpu_priv *priv = nft_expr_priv(expr);
	struct nft_counter_percpu __percpu *cpu_stats;
	struct nft_counter_percpu *this_cpu;

	cpu_stats = netdev_alloc_pcpu_stats(struct nft_counter_percpu);
	if (cpu_stats == NULL)
		return ENOMEM;

	preempt_disable();
	this_cpu = this_cpu_ptr(cpu_stats);
	if (tb[NFTA_COUNTER_PACKETS]) {
	        this_cpu->counter.packets =
			be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
	}
	if (tb[NFTA_COUNTER_BYTES]) {
		this_cpu->counter.bytes =
			be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
	}
	preempt_enable();
	priv->counter = cpu_stats;
	return 0;
}

static void nft_counter_destroy(const struct nft_ctx *ctx,
				const struct nft_expr *expr)
{
	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);

	free_percpu(priv->counter);
}

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_percpu_priv)),
	.eval		= nft_counter_eval,
	.init		= nft_counter_init,
	.destroy	= nft_counter_destroy,
	.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 {
96518518 PM	21	u64 bytes;
	22	u64 packets;
	23	};
	24
0c45e769 PNA	25	struct nft_counter_percpu {
	26	struct nft_counter counter;
	27	struct u64_stats_sync syncp;
	28	};
	29
	30	struct nft_counter_percpu_priv {
	31	struct nft_counter_percpu __percpu *counter;
	32	};
	33
96518518	34	static void nft_counter_eval(const struct nft_expr *expr,
a55e22e9	35	struct nft_regs *regs,
96518518 PM	36	const struct nft_pktinfo *pkt)
96518518 PM	37	{
0c45e769 PNA	38	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
	39	struct nft_counter_percpu *this_cpu;
	40
	41	local_bh_disable();
	42	this_cpu = this_cpu_ptr(priv->counter);
	43	u64_stats_update_begin(&this_cpu->syncp);
	44	this_cpu->counter.bytes += pkt->skb->len;
	45	this_cpu->counter.packets++;
	46	u64_stats_update_end(&this_cpu->syncp);
	47	local_bh_enable();
96518518 PM	48	}
	49
	50	static int nft_counter_dump(struct sk_buff skb, const struct nft_expr expr)
	51	{
0c45e769 PNA	52	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
	53	struct nft_counter_percpu *cpu_stats;
	54	struct nft_counter total;
	55	u64 bytes, packets;
96518518	56	unsigned int seq;
0c45e769 PNA	57	int cpu;
	58
	59	memset(&total, 0, sizeof(total));
	60	for_each_possible_cpu(cpu) {
	61	cpu_stats = per_cpu_ptr(priv->counter, cpu);
	62	do {
	63	seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
	64	bytes = cpu_stats->counter.bytes;
	65	packets = cpu_stats->counter.packets;
	66	} while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
	67
	68	total.packets += packets;
	69	total.bytes += bytes;
	70	}
	71
	72	if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)) \|\|
	73	nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.packets)))
96518518 PM	74	goto nla_put_failure;
	75	return 0;
	76
	77	nla_put_failure:
	78	return -1;
	79	}
	80
	81	static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
	82	[NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
	83	[NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
	84	};
	85
	86	static int nft_counter_init(const struct nft_ctx *ctx,
	87	const struct nft_expr *expr,
	88	const struct nlattr * const tb[])
	89	{
0c45e769 PNA	90	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
	91	struct nft_counter_percpu __percpu *cpu_stats;
	92	struct nft_counter_percpu *this_cpu;
	93
	94	cpu_stats = netdev_alloc_pcpu_stats(struct nft_counter_percpu);
	95	if (cpu_stats == NULL)
	96	return ENOMEM;
	97
	98	preempt_disable();
	99	this_cpu = this_cpu_ptr(cpu_stats);
	100	if (tb[NFTA_COUNTER_PACKETS]) {
	101	this_cpu->counter.packets =
	102	be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
	103	}
	104	if (tb[NFTA_COUNTER_BYTES]) {
	105	this_cpu->counter.bytes =
	106	be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
	107	}
	108	preempt_enable();
	109	priv->counter = cpu_stats;
	110	return 0;
	111	}
96518518	112
0c45e769 PNA	113	static void nft_counter_destroy(const struct nft_ctx *ctx,
	114	const struct nft_expr *expr)
	115	{
	116	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
96518518	117
0c45e769	118	free_percpu(priv->counter);
96518518 PM	119	}
96518518 PM	120
ef1f7df9 PM	121	static struct nft_expr_type nft_counter_type;
	122	static const struct nft_expr_ops nft_counter_ops = {
	123	.type = &nft_counter_type,
0c45e769	124	.size = NFT_EXPR_SIZE(sizeof(struct nft_counter_percpu_priv)),
96518518 PM	125	.eval = nft_counter_eval,
96518518 PM	126	.init = nft_counter_init,
0c45e769	127	.destroy = nft_counter_destroy,
96518518 PM	128	.dump = nft_counter_dump,
	129	};
	130
ef1f7df9 PM	131	static struct nft_expr_type nft_counter_type __read_mostly = {
	132	.name = "counter",
	133	.ops = &nft_counter_ops,
	134	.policy = nft_counter_policy,
	135	.maxattr = NFTA_COUNTER_MAX,
151d799a	136	.flags = NFT_EXPR_STATEFUL,
ef1f7df9 PM	137	.owner = THIS_MODULE,
	138	};
	139
96518518 PM	140	static int __init nft_counter_module_init(void)
96518518 PM	141	{
ef1f7df9	142	return nft_register_expr(&nft_counter_type);
96518518 PM	143	}
	144
	145	static void __exit nft_counter_module_exit(void)
	146	{
ef1f7df9	147	nft_unregister_expr(&nft_counter_type);
96518518 PM	148	}
	149
	150	module_init(nft_counter_module_init);
	151	module_exit(nft_counter_module_exit);
	152
	153	MODULE_LICENSE("GPL");
	154	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	155	MODULE_ALIAS_NFT_EXPR("counter");