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

/* iptables module for using new netfilter netlink queue
 *
 * (C) 2005 by Harald Welte <laforge@netfilter.org>
 *
 * 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.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/skbuff.h>

#include <linux/netfilter.h>
#include <linux/netfilter_arp.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_NFQUEUE.h>

#include <net/netfilter/nf_queue.h>

MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_DESCRIPTION("Xtables: packet forwarding to netlink");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_NFQUEUE");
MODULE_ALIAS("ip6t_NFQUEUE");
MODULE_ALIAS("arpt_NFQUEUE");

static u32 jhash_initval __read_mostly;

static unsigned int
nfqueue_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct xt_NFQ_info *tinfo = par->targinfo;

	return NF_QUEUE_NR(tinfo->queuenum);
}

static unsigned int
nfqueue_tg_v1(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct xt_NFQ_info_v1 *info = par->targinfo;
	u32 queue = info->queuenum;

	if (info->queues_total > 1) {
		queue = nfqueue_hash(skb, queue, info->queues_total,
				     xt_family(par), jhash_initval);
	}
	return NF_QUEUE_NR(queue);
}

static unsigned int
nfqueue_tg_v2(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct xt_NFQ_info_v2 *info = par->targinfo;
	unsigned int ret = nfqueue_tg_v1(skb, par);

	if (info->bypass)
		ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
	return ret;
}

static int nfqueue_tg_check(const struct xt_tgchk_param *par)
{
	const struct xt_NFQ_info_v3 *info = par->targinfo;
	u32 maxid;

	init_hashrandom(&jhash_initval);

	if (info->queues_total == 0) {
		pr_info_ratelimited("number of total queues is 0\n");
		return -EINVAL;
	}
	maxid = info->queues_total - 1 + info->queuenum;
	if (maxid > 0xffff) {
		pr_info_ratelimited("number of queues (%u) out of range (got %u)\n",
				    info->queues_total, maxid);
		return -ERANGE;
	}
	if (par->target->revision == 2 && info->flags > 1)
		return -EINVAL;
	if (par->target->revision == 3 && info->flags & ~NFQ_FLAG_MASK)
		return -EINVAL;

	return 0;
}

static unsigned int
nfqueue_tg_v3(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct xt_NFQ_info_v3 *info = par->targinfo;
	u32 queue = info->queuenum;
	int ret;

	if (info->queues_total > 1) {
		if (info->flags & NFQ_FLAG_CPU_FANOUT) {
			int cpu = smp_processor_id();

			queue = info->queuenum + cpu % info->queues_total;
		} else {
			queue = nfqueue_hash(skb, queue, info->queues_total,
					     xt_family(par), jhash_initval);
		}
	}

	ret = NF_QUEUE_NR(queue);
	if (info->flags & NFQ_FLAG_BYPASS)
		ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;

	return ret;
}

static struct xt_target nfqueue_tg_reg[] __read_mostly = {
	{
		.name		= "NFQUEUE",
		.family		= NFPROTO_UNSPEC,
		.target		= nfqueue_tg,
		.targetsize	= sizeof(struct xt_NFQ_info),
		.me		= THIS_MODULE,
	},
	{
		.name		= "NFQUEUE",
		.revision	= 1,
		.family		= NFPROTO_UNSPEC,
		.checkentry	= nfqueue_tg_check,
		.target		= nfqueue_tg_v1,
		.targetsize	= sizeof(struct xt_NFQ_info_v1),
		.me		= THIS_MODULE,
	},
	{
		.name		= "NFQUEUE",
		.revision	= 2,
		.family		= NFPROTO_UNSPEC,
		.checkentry	= nfqueue_tg_check,
		.target		= nfqueue_tg_v2,
		.targetsize	= sizeof(struct xt_NFQ_info_v2),
		.me		= THIS_MODULE,
	},
	{
		.name		= "NFQUEUE",
		.revision	= 3,
		.family		= NFPROTO_UNSPEC,
		.checkentry	= nfqueue_tg_check,
		.target		= nfqueue_tg_v3,
		.targetsize	= sizeof(struct xt_NFQ_info_v3),
		.me		= THIS_MODULE,
	},
};

static int __init nfqueue_tg_init(void)
{
	return xt_register_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
}

static void __exit nfqueue_tg_exit(void)
{
	xt_unregister_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
}

module_init(nfqueue_tg_init);
module_exit(nfqueue_tg_exit);
Commit	Line	Data
2e4e6a17 HW	1	/* iptables module for using new netfilter netlink queue
	2	*
	3	* (C) 2005 by Harald Welte <laforge@netfilter.org>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
601e68e1	6	* it under the terms of the GNU General Public License version 2 as
2e4e6a17	7	* published by the Free Software Foundation.
601e68e1	8	*
2e4e6a17 HW	9	*/
2e4e6a17 HW	10
e016c5e4 FW	11	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
e016c5e4 FW	12
2e4e6a17 HW	13	#include <linux/module.h>
	14	#include <linux/skbuff.h>
	15
	16	#include <linux/netfilter.h>
	17	#include <linux/netfilter_arp.h>
	18	#include <linux/netfilter/x_tables.h>
	19	#include <linux/netfilter/xt_NFQUEUE.h>
	20
97a2d41c EL	21	#include <net/netfilter/nf_queue.h>
97a2d41c EL	22
2e4e6a17	23	MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
2ae15b64	24	MODULE_DESCRIPTION("Xtables: packet forwarding to netlink");
2e4e6a17 HW	25	MODULE_LICENSE("GPL");
	26	MODULE_ALIAS("ipt_NFQUEUE");
	27	MODULE_ALIAS("ip6t_NFQUEUE");
	28	MODULE_ALIAS("arpt_NFQUEUE");
	29
10662aa3 FW	30	static u32 jhash_initval __read_mostly;
10662aa3 FW	31
2e4e6a17	32	static unsigned int
4b560b44	33	nfqueue_tg(struct sk_buff skb, const struct xt_action_param par)
2e4e6a17	34	{
7eb35586	35	const struct xt_NFQ_info *tinfo = par->targinfo;
2e4e6a17 HW	36
	37	return NF_QUEUE_NR(tinfo->queuenum);
	38	}
	39
5c33448c	40	static unsigned int
	41	nfqueue_tg_v1(struct sk_buff skb, const struct xt_action_param par)
	42	{
	43	const struct xt_NFQ_info_v1 *info = par->targinfo;
	44	u32 queue = info->queuenum;
	45
97a2d41c EL	46	if (info->queues_total > 1) {
97a2d41c EL	47	queue = nfqueue_hash(skb, queue, info->queues_total,
613dbd95	48	xt_family(par), jhash_initval);
97a2d41c	49	}
10662aa3 FW	50	return NF_QUEUE_NR(queue);
10662aa3 FW	51	}
10662aa3	52
94b27cc3 FW	53	static unsigned int
94b27cc3 FW	54	nfqueue_tg_v2(struct sk_buff skb, const struct xt_action_param par)
10662aa3	55	{
94b27cc3 FW	56	const struct xt_NFQ_info_v2 *info = par->targinfo;
	57	unsigned int ret = nfqueue_tg_v1(skb, par);
	58
	59	if (info->bypass)
	60	ret \|= NF_VERDICT_FLAG_QUEUE_BYPASS;
	61	return ret;
	62	}
	63
	64	static int nfqueue_tg_check(const struct xt_tgchk_param *par)
	65	{
8746ddcf	66	const struct xt_NFQ_info_v3 *info = par->targinfo;
10662aa3 FW	67	u32 maxid;
10662aa3 FW	68
97a2d41c EL	69	init_hashrandom(&jhash_initval);
97a2d41c EL	70
10662aa3	71	if (info->queues_total == 0) {
e016c5e4	72	pr_info_ratelimited("number of total queues is 0\n");
d6b00a53	73	return -EINVAL;
10662aa3 FW	74	}
	75	maxid = info->queues_total - 1 + info->queuenum;
	76	if (maxid > 0xffff) {
e016c5e4 FW	77	pr_info_ratelimited("number of queues (%u) out of range (got %u)\n",
e016c5e4 FW	78	info->queues_total, maxid);
4a5a5c73	79	return -ERANGE;
10662aa3	80	}
8746ddcf	81	if (par->target->revision == 2 && info->flags > 1)
	82	return -EINVAL;
	83	if (par->target->revision == 3 && info->flags & ~NFQ_FLAG_MASK)
94b27cc3	84	return -EINVAL;
8746ddcf	85
d6b00a53	86	return 0;
10662aa3 FW	87	}
10662aa3 FW	88
8746ddcf	89	static unsigned int
	90	nfqueue_tg_v3(struct sk_buff skb, const struct xt_action_param par)
	91	{
	92	const struct xt_NFQ_info_v3 *info = par->targinfo;
	93	u32 queue = info->queuenum;
d9547773	94	int ret;
8746ddcf	95
	96	if (info->queues_total > 1) {
	97	if (info->flags & NFQ_FLAG_CPU_FANOUT) {
	98	int cpu = smp_processor_id();
	99
	100	queue = info->queuenum + cpu % info->queues_total;
97a2d41c EL	101	} else {
97a2d41c EL	102	queue = nfqueue_hash(skb, queue, info->queues_total,
613dbd95	103	xt_family(par), jhash_initval);
97a2d41c	104	}
8746ddcf	105	}
5c33448c	106
d9547773 HE	107	ret = NF_QUEUE_NR(queue);
	108	if (info->flags & NFQ_FLAG_BYPASS)
	109	ret \|= NF_VERDICT_FLAG_QUEUE_BYPASS;
	110
	111	return ret;
8746ddcf	112	}
8746ddcf	113
d3c5ee6d	114	static struct xt_target nfqueue_tg_reg[] __read_mostly = {
4470bbc7 PM	115	{
4470bbc7 PM	116	.name = "NFQUEUE",
61f5abca	117	.family = NFPROTO_UNSPEC,
d3c5ee6d	118	.target = nfqueue_tg,
4470bbc7 PM	119	.targetsize = sizeof(struct xt_NFQ_info),
	120	.me = THIS_MODULE,
	121	},
10662aa3 FW	122	{
	123	.name = "NFQUEUE",
	124	.revision = 1,
f76a47c8	125	.family = NFPROTO_UNSPEC,
94b27cc3	126	.checkentry = nfqueue_tg_check,
f76a47c8	127	.target = nfqueue_tg_v1,
10662aa3 FW	128	.targetsize = sizeof(struct xt_NFQ_info_v1),
	129	.me = THIS_MODULE,
	130	},
94b27cc3 FW	131	{
	132	.name = "NFQUEUE",
	133	.revision = 2,
	134	.family = NFPROTO_UNSPEC,
	135	.checkentry = nfqueue_tg_check,
	136	.target = nfqueue_tg_v2,
	137	.targetsize = sizeof(struct xt_NFQ_info_v2),
	138	.me = THIS_MODULE,
	139	},
8746ddcf	140	{
	141	.name = "NFQUEUE",
	142	.revision = 3,
	143	.family = NFPROTO_UNSPEC,
	144	.checkentry = nfqueue_tg_check,
	145	.target = nfqueue_tg_v3,
	146	.targetsize = sizeof(struct xt_NFQ_info_v3),
	147	.me = THIS_MODULE,
	148	},
2e4e6a17 HW	149	};
2e4e6a17 HW	150
d3c5ee6d	151	static int __init nfqueue_tg_init(void)
2e4e6a17	152	{
d3c5ee6d	153	return xt_register_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
2e4e6a17 HW	154	}
2e4e6a17 HW	155
d3c5ee6d	156	static void __exit nfqueue_tg_exit(void)
2e4e6a17	157	{
d3c5ee6d	158	xt_unregister_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
2e4e6a17 HW	159	}
2e4e6a17 HW	160
d3c5ee6d JE	161	module_init(nfqueue_tg_init);
d3c5ee6d JE	162	module_exit(nfqueue_tg_exit);