[linux.git] / net / netfilter / nft_counter.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2008-2009 Patrick McHardy <[email protected]>
 *
 * 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>
#include <net/netfilter/nf_tables_offload.h>

struct nft_counter {
	s64		bytes;
	s64		packets;
};

struct nft_counter_percpu_priv {
	struct nft_counter __percpu *counter;
};

static DEFINE_PER_CPU(seqcount_t, nft_counter_seq);

static inline void nft_counter_do_eval(struct nft_counter_percpu_priv *priv,
				       struct nft_regs *regs,
				       const struct nft_pktinfo *pkt)
{
	struct nft_counter *this_cpu;
	seqcount_t *myseq;

	local_bh_disable();
	this_cpu = this_cpu_ptr(priv->counter);
	myseq = this_cpu_ptr(&nft_counter_seq);

	write_seqcount_begin(myseq);

	this_cpu->bytes += pkt->skb->len;
	this_cpu->packets++;

	write_seqcount_end(myseq);
	local_bh_enable();
}

static inline void nft_counter_obj_eval(struct nft_object *obj,
					struct nft_regs *regs,
					const struct nft_pktinfo *pkt)
{
	struct nft_counter_percpu_priv *priv = nft_obj_data(obj);

	nft_counter_do_eval(priv, regs, pkt);
}

static int nft_counter_do_init(const struct nlattr * const tb[],
			       struct nft_counter_percpu_priv *priv)
{
	struct nft_counter __percpu *cpu_stats;
	struct nft_counter *this_cpu;

	cpu_stats = alloc_percpu(struct nft_counter);
	if (cpu_stats == NULL)
		return -ENOMEM;

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

static int nft_counter_obj_init(const struct nft_ctx *ctx,
				const struct nlattr * const tb[],
				struct nft_object *obj)
{
	struct nft_counter_percpu_priv *priv = nft_obj_data(obj);

	return nft_counter_do_init(tb, priv);
}

static void nft_counter_do_destroy(struct nft_counter_percpu_priv *priv)
{
	free_percpu(priv->counter);
}

static void nft_counter_obj_destroy(const struct nft_ctx *ctx,
				    struct nft_object *obj)
{
	struct nft_counter_percpu_priv *priv = nft_obj_data(obj);

	nft_counter_do_destroy(priv);
}

static void nft_counter_reset(struct nft_counter_percpu_priv *priv,
			      struct nft_counter *total)
{
	struct nft_counter *this_cpu;

	local_bh_disable();
	this_cpu = this_cpu_ptr(priv->counter);
	this_cpu->packets -= total->packets;
	this_cpu->bytes -= total->bytes;
	local_bh_enable();
}

static void nft_counter_fetch(struct nft_counter_percpu_priv *priv,
			      struct nft_counter *total)
{
	struct nft_counter *this_cpu;
	const seqcount_t *myseq;
	u64 bytes, packets;
	unsigned int seq;
	int cpu;

	memset(total, 0, sizeof(*total));
	for_each_possible_cpu(cpu) {
		myseq = per_cpu_ptr(&nft_counter_seq, cpu);
		this_cpu = per_cpu_ptr(priv->counter, cpu);
		do {
			seq	= read_seqcount_begin(myseq);
			bytes	= this_cpu->bytes;
			packets	= this_cpu->packets;
		} while (read_seqcount_retry(myseq, seq));

		total->bytes	+= bytes;
		total->packets	+= packets;
	}
}

static int nft_counter_do_dump(struct sk_buff *skb,
			       struct nft_counter_percpu_priv *priv,
			       bool reset)
{
	struct nft_counter total;

	nft_counter_fetch(priv, &total);

	if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
			 NFTA_COUNTER_PAD) ||
	    nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.packets),
			 NFTA_COUNTER_PAD))
		goto nla_put_failure;

	if (reset)
		nft_counter_reset(priv, &total);

	return 0;

nla_put_failure:
	return -1;
}

static int nft_counter_obj_dump(struct sk_buff *skb,
				struct nft_object *obj, bool reset)
{
	struct nft_counter_percpu_priv *priv = nft_obj_data(obj);

	return nft_counter_do_dump(skb, priv, reset);
}

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 struct nft_object_type nft_counter_obj_type;
static const struct nft_object_ops nft_counter_obj_ops = {
	.type		= &nft_counter_obj_type,
	.size		= sizeof(struct nft_counter_percpu_priv),
	.eval		= nft_counter_obj_eval,
	.init		= nft_counter_obj_init,
	.destroy	= nft_counter_obj_destroy,
	.dump		= nft_counter_obj_dump,
};

static struct nft_object_type nft_counter_obj_type __read_mostly = {
	.type		= NFT_OBJECT_COUNTER,
	.ops		= &nft_counter_obj_ops,
	.maxattr	= NFTA_COUNTER_MAX,
	.policy		= nft_counter_policy,
	.owner		= THIS_MODULE,
};

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);

	nft_counter_do_eval(priv, regs, pkt);
}

static int nft_counter_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);

	return nft_counter_do_dump(skb, priv, false);
}

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);

	return nft_counter_do_init(tb, priv);
}

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);

	nft_counter_do_destroy(priv);
}

static int nft_counter_clone(struct nft_expr *dst, const struct nft_expr *src)
{
	struct nft_counter_percpu_priv *priv = nft_expr_priv(src);
	struct nft_counter_percpu_priv *priv_clone = nft_expr_priv(dst);
	struct nft_counter __percpu *cpu_stats;
	struct nft_counter *this_cpu;
	struct nft_counter total;

	nft_counter_fetch(priv, &total);

	cpu_stats = alloc_percpu_gfp(struct nft_counter, GFP_ATOMIC);
	if (cpu_stats == NULL)
		return -ENOMEM;

	preempt_disable();
	this_cpu = this_cpu_ptr(cpu_stats);
	this_cpu->packets = total.packets;
	this_cpu->bytes = total.bytes;
	preempt_enable();

	priv_clone->counter = cpu_stats;
	return 0;
}

static int nft_counter_offload(struct nft_offload_ctx *ctx,
			       struct nft_flow_rule *flow,
			       const struct nft_expr *expr)
{
	/* No specific offload action is needed, but report success. */
	return 0;
}

static void nft_counter_offload_stats(struct nft_expr *expr,
				      const struct flow_stats *stats)
{
	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
	struct nft_counter *this_cpu;
	seqcount_t *myseq;

	preempt_disable();
	this_cpu = this_cpu_ptr(priv->counter);
	myseq = this_cpu_ptr(&nft_counter_seq);

	write_seqcount_begin(myseq);
	this_cpu->packets += stats->pkts;
	this_cpu->bytes += stats->bytes;
	write_seqcount_end(myseq);
	preempt_enable();
}

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,
	.destroy_clone	= nft_counter_destroy,
	.dump		= nft_counter_dump,
	.clone		= nft_counter_clone,
	.offload	= nft_counter_offload,
	.offload_stats	= nft_counter_offload_stats,
};

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)
{
	int cpu, err;

	for_each_possible_cpu(cpu)
		seqcount_init(per_cpu_ptr(&nft_counter_seq, cpu));

	err = nft_register_obj(&nft_counter_obj_type);
	if (err < 0)
		return err;

	err = nft_register_expr(&nft_counter_type);
	if (err < 0)
		goto err1;

	return 0;
err1:
	nft_unregister_obj(&nft_counter_obj_type);
	return err;
}

static void __exit nft_counter_module_exit(void)
{
	nft_unregister_expr(&nft_counter_type);
	nft_unregister_obj(&nft_counter_obj_type);
}

module_init(nft_counter_module_init);
module_exit(nft_counter_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <[email protected]>");
MODULE_ALIAS_NFT_EXPR("counter");
MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_COUNTER);
MODULE_DESCRIPTION("nftables counter rule support");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
96518518	2	/*
ef1f7df9	3	* Copyright (c) 2008-2009 Patrick McHardy <[email protected]>
96518518	4	*
96518518 PM	5	* Development of this code funded by Astaro AG (http://www.astaro.com/)
	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/init.h>
	10	#include <linux/module.h>
	11	#include <linux/seqlock.h>
	12	#include <linux/netlink.h>
	13	#include <linux/netfilter.h>
	14	#include <linux/netfilter/nf_tables.h>
	15	#include <net/netfilter/nf_tables.h>
b72920f6	16	#include <net/netfilter/nf_tables_offload.h>
96518518 PM	17
96518518 PM	18	struct nft_counter {
d84701ec PN	19	s64 bytes;
d84701ec PN	20	s64 packets;
0c45e769 PNA	21	};
	22
	23	struct nft_counter_percpu_priv {
d84701ec	24	struct nft_counter __percpu *counter;
0c45e769 PNA	25	};
0c45e769 PNA	26
d84701ec PN	27	static DEFINE_PER_CPU(seqcount_t, nft_counter_seq);
d84701ec PN	28
b1ce0ced PNA	29	static inline void nft_counter_do_eval(struct nft_counter_percpu_priv *priv,
	30	struct nft_regs *regs,
	31	const struct nft_pktinfo *pkt)
96518518	32	{
d84701ec PN	33	struct nft_counter *this_cpu;
d84701ec PN	34	seqcount_t *myseq;
0c45e769 PNA	35
	36	local_bh_disable();
	37	this_cpu = this_cpu_ptr(priv->counter);
d84701ec PN	38	myseq = this_cpu_ptr(&nft_counter_seq);
	39
	40	write_seqcount_begin(myseq);
	41
	42	this_cpu->bytes += pkt->skb->len;
	43	this_cpu->packets++;
	44
	45	write_seqcount_end(myseq);
0c45e769	46	local_bh_enable();
96518518 PM	47	}
96518518 PM	48
b1ce0ced PNA	49	static inline void nft_counter_obj_eval(struct nft_object *obj,
	50	struct nft_regs *regs,
	51	const struct nft_pktinfo *pkt)
	52	{
	53	struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
	54
	55	nft_counter_do_eval(priv, regs, pkt);
	56	}
	57
	58	static int nft_counter_do_init(const struct nlattr * const tb[],
	59	struct nft_counter_percpu_priv *priv)
	60	{
d84701ec PN	61	struct nft_counter __percpu *cpu_stats;
d84701ec PN	62	struct nft_counter *this_cpu;
b1ce0ced	63
d84701ec	64	cpu_stats = alloc_percpu(struct nft_counter);
b1ce0ced PNA	65	if (cpu_stats == NULL)
	66	return -ENOMEM;
	67
	68	preempt_disable();
	69	this_cpu = this_cpu_ptr(cpu_stats);
	70	if (tb[NFTA_COUNTER_PACKETS]) {
d84701ec	71	this_cpu->packets =
b1ce0ced PNA	72	be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
	73	}
	74	if (tb[NFTA_COUNTER_BYTES]) {
d84701ec	75	this_cpu->bytes =
b1ce0ced PNA	76	be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
	77	}
	78	preempt_enable();
	79	priv->counter = cpu_stats;
	80	return 0;
	81	}
	82
84fba055 FW	83	static int nft_counter_obj_init(const struct nft_ctx *ctx,
84fba055 FW	84	const struct nlattr * const tb[],
b1ce0ced PNA	85	struct nft_object *obj)
	86	{
	87	struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
	88
	89	return nft_counter_do_init(tb, priv);
	90	}
	91
	92	static void nft_counter_do_destroy(struct nft_counter_percpu_priv *priv)
	93	{
	94	free_percpu(priv->counter);
	95	}
	96
00bfb320 PNA	97	static void nft_counter_obj_destroy(const struct nft_ctx *ctx,
00bfb320 PNA	98	struct nft_object *obj)
b1ce0ced PNA	99	{
	100	struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
	101
	102	nft_counter_do_destroy(priv);
	103	}
	104
dd03b1ad	105	static void nft_counter_reset(struct nft_counter_percpu_priv *priv,
086f3321	106	struct nft_counter *total)
96518518	107	{
d84701ec	108	struct nft_counter *this_cpu;
0c45e769	109
d84701ec PN	110	local_bh_disable();
	111	this_cpu = this_cpu_ptr(priv->counter);
	112	this_cpu->packets -= total->packets;
	113	this_cpu->bytes -= total->bytes;
	114	local_bh_enable();
43da04a5 PNA	115	}
43da04a5 PNA	116
d84701ec	117	static void nft_counter_fetch(struct nft_counter_percpu_priv *priv,
43da04a5 PNA	118	struct nft_counter *total)
43da04a5 PNA	119	{
d84701ec PN	120	struct nft_counter *this_cpu;
d84701ec PN	121	const seqcount_t *myseq;
43da04a5 PNA	122	u64 bytes, packets;
	123	unsigned int seq;
	124	int cpu;
	125
	126	memset(total, 0, sizeof(*total));
	127	for_each_possible_cpu(cpu) {
d84701ec PN	128	myseq = per_cpu_ptr(&nft_counter_seq, cpu);
d84701ec PN	129	this_cpu = per_cpu_ptr(priv->counter, cpu);
43da04a5	130	do {
d84701ec PN	131	seq = read_seqcount_begin(myseq);
	132	bytes = this_cpu->bytes;
	133	packets = this_cpu->packets;
	134	} while (read_seqcount_retry(myseq, seq));
43da04a5	135
d84701ec PN	136	total->bytes += bytes;
d84701ec PN	137	total->packets += packets;
43da04a5 PNA	138	}
	139	}
	140
b1ce0ced	141	static int nft_counter_do_dump(struct sk_buff *skb,
d84701ec	142	struct nft_counter_percpu_priv *priv,
43da04a5	143	bool reset)
086f3321	144	{
086f3321 PNA	145	struct nft_counter total;
086f3321 PNA	146
d84701ec	147	nft_counter_fetch(priv, &total);
0c45e769	148
b46f6ded ND	149	if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
	150	NFTA_COUNTER_PAD) \|\|
	151	nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.packets),
	152	NFTA_COUNTER_PAD))
96518518	153	goto nla_put_failure;
d84701ec PN	154
	155	if (reset)
	156	nft_counter_reset(priv, &total);
	157
96518518 PM	158	return 0;
	159
	160	nla_put_failure:
	161	return -1;
	162	}
	163
b1ce0ced	164	static int nft_counter_obj_dump(struct sk_buff *skb,
43da04a5	165	struct nft_object *obj, bool reset)
b1ce0ced	166	{
43da04a5	167	struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
b1ce0ced	168
43da04a5	169	return nft_counter_do_dump(skb, priv, reset);
b1ce0ced PNA	170	}
b1ce0ced PNA	171
96518518 PM	172	static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
	173	[NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
	174	[NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
	175	};
	176
dfc46034 PBG	177	static struct nft_object_type nft_counter_obj_type;
	178	static const struct nft_object_ops nft_counter_obj_ops = {
	179	.type = &nft_counter_obj_type,
b1ce0ced	180	.size = sizeof(struct nft_counter_percpu_priv),
b1ce0ced PNA	181	.eval = nft_counter_obj_eval,
	182	.init = nft_counter_obj_init,
	183	.destroy = nft_counter_obj_destroy,
	184	.dump = nft_counter_obj_dump,
dfc46034 PBG	185	};
	186
	187	static struct nft_object_type nft_counter_obj_type __read_mostly = {
	188	.type = NFT_OBJECT_COUNTER,
	189	.ops = &nft_counter_obj_ops,
	190	.maxattr = NFTA_COUNTER_MAX,
	191	.policy = nft_counter_policy,
b1ce0ced PNA	192	.owner = THIS_MODULE,
	193	};
	194
	195	static void nft_counter_eval(const struct nft_expr *expr,
	196	struct nft_regs *regs,
	197	const struct nft_pktinfo *pkt)
	198	{
	199	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
	200
	201	nft_counter_do_eval(priv, regs, pkt);
	202	}
	203
	204	static int nft_counter_dump(struct sk_buff skb, const struct nft_expr expr)
	205	{
d84701ec	206	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
b1ce0ced	207
43da04a5	208	return nft_counter_do_dump(skb, priv, false);
b1ce0ced PNA	209	}
b1ce0ced PNA	210
96518518 PM	211	static int nft_counter_init(const struct nft_ctx *ctx,
	212	const struct nft_expr *expr,
	213	const struct nlattr * const tb[])
	214	{
0c45e769	215	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
0c45e769	216
b1ce0ced	217	return nft_counter_do_init(tb, priv);
0c45e769	218	}
96518518	219
0c45e769 PNA	220	static void nft_counter_destroy(const struct nft_ctx *ctx,
	221	const struct nft_expr *expr)
	222	{
	223	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
96518518	224
b1ce0ced	225	nft_counter_do_destroy(priv);
96518518 PM	226	}
96518518 PM	227
086f3321 PNA	228	static int nft_counter_clone(struct nft_expr dst, const struct nft_expr src)
	229	{
	230	struct nft_counter_percpu_priv *priv = nft_expr_priv(src);
	231	struct nft_counter_percpu_priv *priv_clone = nft_expr_priv(dst);
d84701ec PN	232	struct nft_counter __percpu *cpu_stats;
d84701ec PN	233	struct nft_counter *this_cpu;
086f3321 PNA	234	struct nft_counter total;
086f3321 PNA	235
d84701ec	236	nft_counter_fetch(priv, &total);
086f3321	237
d84701ec	238	cpu_stats = alloc_percpu_gfp(struct nft_counter, GFP_ATOMIC);
086f3321	239	if (cpu_stats == NULL)
5cc6ce9f	240	return -ENOMEM;
086f3321 PNA	241
	242	preempt_disable();
	243	this_cpu = this_cpu_ptr(cpu_stats);
d84701ec PN	244	this_cpu->packets = total.packets;
d84701ec PN	245	this_cpu->bytes = total.bytes;
086f3321 PNA	246	preempt_enable();
	247
	248	priv_clone->counter = cpu_stats;
	249	return 0;
	250	}
	251
b72920f6 PNA	252	static int nft_counter_offload(struct nft_offload_ctx *ctx,
	253	struct nft_flow_rule *flow,
	254	const struct nft_expr *expr)
	255	{
	256	/* No specific offload action is needed, but report success. */
	257	return 0;
	258	}
	259
	260	static void nft_counter_offload_stats(struct nft_expr *expr,
	261	const struct flow_stats *stats)
	262	{
	263	struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
	264	struct nft_counter *this_cpu;
	265	seqcount_t *myseq;
	266
	267	preempt_disable();
	268	this_cpu = this_cpu_ptr(priv->counter);
	269	myseq = this_cpu_ptr(&nft_counter_seq);
	270
	271	write_seqcount_begin(myseq);
	272	this_cpu->packets += stats->pkts;
	273	this_cpu->bytes += stats->bytes;
	274	write_seqcount_end(myseq);
	275	preempt_enable();
	276	}
	277
ef1f7df9 PM	278	static struct nft_expr_type nft_counter_type;
	279	static const struct nft_expr_ops nft_counter_ops = {
	280	.type = &nft_counter_type,
0c45e769	281	.size = NFT_EXPR_SIZE(sizeof(struct nft_counter_percpu_priv)),
96518518 PM	282	.eval = nft_counter_eval,
96518518 PM	283	.init = nft_counter_init,
0c45e769	284	.destroy = nft_counter_destroy,
371ebcbb	285	.destroy_clone = nft_counter_destroy,
96518518	286	.dump = nft_counter_dump,
086f3321	287	.clone = nft_counter_clone,
b72920f6 PNA	288	.offload = nft_counter_offload,
b72920f6 PNA	289	.offload_stats = nft_counter_offload_stats,
96518518 PM	290	};
96518518 PM	291
ef1f7df9 PM	292	static struct nft_expr_type nft_counter_type __read_mostly = {
	293	.name = "counter",
	294	.ops = &nft_counter_ops,
	295	.policy = nft_counter_policy,
	296	.maxattr = NFTA_COUNTER_MAX,
151d799a	297	.flags = NFT_EXPR_STATEFUL,
ef1f7df9 PM	298	.owner = THIS_MODULE,
	299	};
	300
96518518 PM	301	static int __init nft_counter_module_init(void)
96518518 PM	302	{
d84701ec PN	303	int cpu, err;
	304
	305	for_each_possible_cpu(cpu)
	306	seqcount_init(per_cpu_ptr(&nft_counter_seq, cpu));
b1ce0ced	307
dfc46034	308	err = nft_register_obj(&nft_counter_obj_type);
b1ce0ced PNA	309	if (err < 0)
	310	return err;
	311
	312	err = nft_register_expr(&nft_counter_type);
	313	if (err < 0)
	314	goto err1;
	315
	316	return 0;
	317	err1:
dfc46034	318	nft_unregister_obj(&nft_counter_obj_type);
b1ce0ced	319	return err;
96518518 PM	320	}
	321
	322	static void __exit nft_counter_module_exit(void)
	323	{
ef1f7df9	324	nft_unregister_expr(&nft_counter_type);
dfc46034	325	nft_unregister_obj(&nft_counter_obj_type);
96518518 PM	326	}
	327
	328	module_init(nft_counter_module_init);
	329	module_exit(nft_counter_module_exit);
	330
	331	MODULE_LICENSE("GPL");
	332	MODULE_AUTHOR("Patrick McHardy <[email protected]>");
	333	MODULE_ALIAS_NFT_EXPR("counter");
b1ce0ced	334	MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_COUNTER);
4cacc395	335	MODULE_DESCRIPTION("nftables counter rule support");