[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.
 *
 */

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