[net-next-2.6.git] / net / ipv4 / netfilter / ipt_REJECT.c

/*
 * This is a module which is used for rejecting packets.
 * Added support for customized reject packets (Jozsef Kadlecsik).
 * Added support for ICMP type-3-code-13 (Maciej Soltysiak). [RFC 1812]
 */

/* (C) 1999-2001 Paul `Rusty' Russell
 * (C) 2002-2004 Netfilter Core Team <coreteam@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/config.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/icmp.h>
#include <net/icmp.h>
#include <net/ip.h>
#include <net/tcp.h>
#include <net/route.h>
#include <net/dst.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_REJECT.h>
#ifdef CONFIG_BRIDGE_NETFILTER
#include <linux/netfilter_bridge.h>
#endif

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("iptables REJECT target module");

#if 0
#define DEBUGP printk
#else
#define DEBUGP(format, args...)
#endif

static inline struct rtable *route_reverse(struct sk_buff *skb, 
					   struct tcphdr *tcph, int hook)
{
	struct iphdr *iph = skb->nh.iph;
	struct dst_entry *odst;
	struct flowi fl = {};
	struct rtable *rt;

	/* We don't require ip forwarding to be enabled to be able to
	 * send a RST reply for bridged traffic. */
	if (hook != NF_IP_FORWARD
#ifdef CONFIG_BRIDGE_NETFILTER
	    || (skb->nf_bridge && skb->nf_bridge->mask & BRNF_BRIDGED)
#endif
	   ) {
		fl.nl_u.ip4_u.daddr = iph->saddr;
		if (hook == NF_IP_LOCAL_IN)
			fl.nl_u.ip4_u.saddr = iph->daddr;
		fl.nl_u.ip4_u.tos = RT_TOS(iph->tos);

		if (ip_route_output_key(&rt, &fl) != 0)
			return NULL;
	} else {
		/* non-local src, find valid iif to satisfy
		 * rp-filter when calling ip_route_input. */
		fl.nl_u.ip4_u.daddr = iph->daddr;
		if (ip_route_output_key(&rt, &fl) != 0)
			return NULL;

		odst = skb->dst;
		if (ip_route_input(skb, iph->saddr, iph->daddr,
		                   RT_TOS(iph->tos), rt->u.dst.dev) != 0) {
			dst_release(&rt->u.dst);
			return NULL;
		}
		dst_release(&rt->u.dst);
		rt = (struct rtable *)skb->dst;
		skb->dst = odst;

		fl.nl_u.ip4_u.daddr = iph->saddr;
		fl.nl_u.ip4_u.saddr = iph->daddr;
		fl.nl_u.ip4_u.tos = RT_TOS(iph->tos);
	}

	if (rt->u.dst.error) {
		dst_release(&rt->u.dst);
		return NULL;
	}

	fl.proto = IPPROTO_TCP;
	fl.fl_ip_sport = tcph->dest;
	fl.fl_ip_dport = tcph->source;

	xfrm_lookup((struct dst_entry **)&rt, &fl, NULL, 0);

	return rt;
}

/* Send RST reply */
static void send_reset(struct sk_buff *oldskb, int hook)
{
	struct sk_buff *nskb;
	struct iphdr *iph = oldskb->nh.iph;
	struct tcphdr _otcph, *oth, *tcph;
	struct rtable *rt;
	u_int16_t tmp_port;
	u_int32_t tmp_addr;
	unsigned int tcplen;
	int needs_ack;
	int hh_len;

	/* IP header checks: fragment. */
	if (oldskb->nh.iph->frag_off & htons(IP_OFFSET))
		return;

	oth = skb_header_pointer(oldskb, oldskb->nh.iph->ihl * 4,
				 sizeof(_otcph), &_otcph);
	if (oth == NULL)
 		return;

	/* No RST for RST. */
	if (oth->rst)
		return;

	/* Check checksum */
	tcplen = oldskb->len - iph->ihl * 4;
	if (((hook != NF_IP_LOCAL_IN && oldskb->ip_summed != CHECKSUM_HW) ||
	     (hook == NF_IP_LOCAL_IN &&
	      oldskb->ip_summed != CHECKSUM_UNNECESSARY)) &&
	    csum_tcpudp_magic(iph->saddr, iph->daddr, tcplen, IPPROTO_TCP,
	                      oldskb->ip_summed == CHECKSUM_HW ? oldskb->csum :
	                      skb_checksum(oldskb, iph->ihl * 4, tcplen, 0)))
		return;

	if ((rt = route_reverse(oldskb, oth, hook)) == NULL)
		return;

	hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);

	/* We need a linear, writeable skb.  We also need to expand
	   headroom in case hh_len of incoming interface < hh_len of
	   outgoing interface */
	nskb = skb_copy_expand(oldskb, hh_len, skb_tailroom(oldskb),
			       GFP_ATOMIC);
	if (!nskb) {
		dst_release(&rt->u.dst);
		return;
	}

	dst_release(nskb->dst);
	nskb->dst = &rt->u.dst;

	/* This packet will not be the same as the other: clear nf fields */
	nf_reset(nskb);
	nskb->nfmark = 0;

	tcph = (struct tcphdr *)((u_int32_t*)nskb->nh.iph + nskb->nh.iph->ihl);

	/* Swap source and dest */
	tmp_addr = nskb->nh.iph->saddr;
	nskb->nh.iph->saddr = nskb->nh.iph->daddr;
	nskb->nh.iph->daddr = tmp_addr;
	tmp_port = tcph->source;
	tcph->source = tcph->dest;
	tcph->dest = tmp_port;

	/* Truncate to length (no data) */
	tcph->doff = sizeof(struct tcphdr)/4;
	skb_trim(nskb, nskb->nh.iph->ihl*4 + sizeof(struct tcphdr));
	nskb->nh.iph->tot_len = htons(nskb->len);

	if (tcph->ack) {
		needs_ack = 0;
		tcph->seq = oth->ack_seq;
		tcph->ack_seq = 0;
	} else {
		needs_ack = 1;
		tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin
				      + oldskb->len - oldskb->nh.iph->ihl*4
				      - (oth->doff<<2));
		tcph->seq = 0;
	}

	/* Reset flags */
	((u_int8_t *)tcph)[13] = 0;
	tcph->rst = 1;
	tcph->ack = needs_ack;

	tcph->window = 0;
	tcph->urg_ptr = 0;

	/* Adjust TCP checksum */
	tcph->check = 0;
	tcph->check = tcp_v4_check(tcph, sizeof(struct tcphdr),
				   nskb->nh.iph->saddr,
				   nskb->nh.iph->daddr,
				   csum_partial((char *)tcph,
						sizeof(struct tcphdr), 0));

	/* Adjust IP TTL, DF */
	nskb->nh.iph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT);
	/* Set DF, id = 0 */
	nskb->nh.iph->frag_off = htons(IP_DF);
	nskb->nh.iph->id = 0;

	/* Adjust IP checksum */
	nskb->nh.iph->check = 0;
	nskb->nh.iph->check = ip_fast_csum((unsigned char *)nskb->nh.iph, 
					   nskb->nh.iph->ihl);

	/* "Never happens" */
	if (nskb->len > dst_mtu(nskb->dst))
		goto free_nskb;

	nf_ct_attach(nskb, oldskb);

	NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, nskb, NULL, nskb->dst->dev,
		dst_output);
	return;

 free_nskb:
	kfree_skb(nskb);
}

static inline void send_unreach(struct sk_buff *skb_in, int code)
{
	icmp_send(skb_in, ICMP_DEST_UNREACH, code, 0);
}	

static unsigned int reject(struct sk_buff **pskb,
			   const struct net_device *in,
			   const struct net_device *out,
			   unsigned int hooknum,
			   const struct xt_target *target,
			   const void *targinfo,
			   void *userinfo)
{
	const struct ipt_reject_info *reject = targinfo;

	/* Our naive response construction doesn't deal with IP
           options, and probably shouldn't try. */
	if ((*pskb)->nh.iph->ihl<<2 != sizeof(struct iphdr))
		return NF_DROP;

	/* WARNING: This code causes reentry within iptables.
	   This means that the iptables jump stack is now crap.  We
	   must return an absolute verdict. --RR */
    	switch (reject->with) {
    	case IPT_ICMP_NET_UNREACHABLE:
    		send_unreach(*pskb, ICMP_NET_UNREACH);
    		break;
    	case IPT_ICMP_HOST_UNREACHABLE:
    		send_unreach(*pskb, ICMP_HOST_UNREACH);
    		break;
    	case IPT_ICMP_PROT_UNREACHABLE:
    		send_unreach(*pskb, ICMP_PROT_UNREACH);
    		break;
    	case IPT_ICMP_PORT_UNREACHABLE:
    		send_unreach(*pskb, ICMP_PORT_UNREACH);
    		break;
    	case IPT_ICMP_NET_PROHIBITED:
    		send_unreach(*pskb, ICMP_NET_ANO);
    		break;
	case IPT_ICMP_HOST_PROHIBITED:
    		send_unreach(*pskb, ICMP_HOST_ANO);
    		break;
    	case IPT_ICMP_ADMIN_PROHIBITED:
		send_unreach(*pskb, ICMP_PKT_FILTERED);
		break;
	case IPT_TCP_RESET:
		send_reset(*pskb, hooknum);
	case IPT_ICMP_ECHOREPLY:
		/* Doesn't happen. */
		break;
	}

	return NF_DROP;
}

static int check(const char *tablename,
		 const void *e_void,
		 const struct xt_target *target,
		 void *targinfo,
		 unsigned int targinfosize,
		 unsigned int hook_mask)
{
 	const struct ipt_reject_info *rejinfo = targinfo;
	const struct ipt_entry *e = e_void;

	if (rejinfo->with == IPT_ICMP_ECHOREPLY) {
		printk("REJECT: ECHOREPLY no longer supported.\n");
		return 0;
	} else if (rejinfo->with == IPT_TCP_RESET) {
		/* Must specify that it's a TCP packet */
		if (e->ip.proto != IPPROTO_TCP
		    || (e->ip.invflags & IPT_INV_PROTO)) {
			DEBUGP("REJECT: TCP_RESET invalid for non-tcp\n");
			return 0;
		}
	}
	return 1;
}

static struct ipt_target ipt_reject_reg = {
	.name		= "REJECT",
	.target		= reject,
	.targetsize	= sizeof(struct ipt_reject_info),
	.table		= "filter",
	.hooks		= (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) |
			  (1 << NF_IP_LOCAL_OUT),
	.checkentry	= check,
	.me		= THIS_MODULE,
};

static int __init init(void)
{
	return ipt_register_target(&ipt_reject_reg);
}

static void __exit fini(void)
{
	ipt_unregister_target(&ipt_reject_reg);
}

module_init(init);
module_exit(fini);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This is a module which is used for rejecting packets.
	3	* Added support for customized reject packets (Jozsef Kadlecsik).
	4	* Added support for ICMP type-3-code-13 (Maciej Soltysiak). [RFC 1812]
	5	*/
	6
	7	/* (C) 1999-2001 Paul `Rusty' Russell
	8	* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*/
	14
	15	#include <linux/config.h>
	16	#include <linux/module.h>
	17	#include <linux/skbuff.h>
	18	#include <linux/ip.h>
	19	#include <linux/udp.h>
	20	#include <linux/icmp.h>
	21	#include <net/icmp.h>
	22	#include <net/ip.h>
	23	#include <net/tcp.h>
	24	#include <net/route.h>
	25	#include <net/dst.h>
	26	#include <linux/netfilter_ipv4/ip_tables.h>
	27	#include <linux/netfilter_ipv4/ipt_REJECT.h>
	28	#ifdef CONFIG_BRIDGE_NETFILTER
	29	#include <linux/netfilter_bridge.h>
	30	#endif
	31
	32	MODULE_LICENSE("GPL");
	33	MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
	34	MODULE_DESCRIPTION("iptables REJECT target module");
	35
	36	#if 0
	37	#define DEBUGP printk
	38	#else
	39	#define DEBUGP(format, args...)
	40	#endif
	41
	42	static inline struct rtable route_reverse(struct sk_buff skb,
	43	struct tcphdr *tcph, int hook)
	44	{
	45	struct iphdr *iph = skb->nh.iph;
	46	struct dst_entry *odst;
	47	struct flowi fl = {};
	48	struct rtable *rt;
	49
	50	/* We don't require ip forwarding to be enabled to be able to
	51	* send a RST reply for bridged traffic. */
	52	if (hook != NF_IP_FORWARD
	53	#ifdef CONFIG_BRIDGE_NETFILTER
	54	\|\| (skb->nf_bridge && skb->nf_bridge->mask & BRNF_BRIDGED)
	55	#endif
	56	) {
	57	fl.nl_u.ip4_u.daddr = iph->saddr;
	58	if (hook == NF_IP_LOCAL_IN)
	59	fl.nl_u.ip4_u.saddr = iph->daddr;
	60	fl.nl_u.ip4_u.tos = RT_TOS(iph->tos);
	61
	62	if (ip_route_output_key(&rt, &fl) != 0)
	63	return NULL;
	64	} else {
65	/* non-local src, find valid iif to satisfy
66	* rp-filter when calling ip_route_input. */
67	fl.nl_u.ip4_u.daddr = iph->daddr;
68	if (ip_route_output_key(&rt, &fl) != 0)
69	return NULL;
70
71	odst = skb->dst;
72	if (ip_route_input(skb, iph->saddr, iph->daddr,
73	RT_TOS(iph->tos), rt->u.dst.dev) != 0) {
74	dst_release(&rt->u.dst);
75	return NULL;
76	}
77	dst_release(&rt->u.dst);
78	rt = (struct rtable *)skb->dst;
79	skb->dst = odst;
80
81	fl.nl_u.ip4_u.daddr = iph->saddr;
82	fl.nl_u.ip4_u.saddr = iph->daddr;
83	fl.nl_u.ip4_u.tos = RT_TOS(iph->tos);
84	}
85
86	if (rt->u.dst.error) {
87	dst_release(&rt->u.dst);
88	return NULL;
89	}
90
91	fl.proto = IPPROTO_TCP;
92	fl.fl_ip_sport = tcph->dest;
93	fl.fl_ip_dport = tcph->source;
94
e104411b	95	xfrm_lookup((struct dst_entry **)&rt, &fl, NULL, 0);
1da177e4 LT	96
	97	return rt;
	98	}
	99
	100	/* Send RST reply */
	101	static void send_reset(struct sk_buff *oldskb, int hook)
	102	{
	103	struct sk_buff *nskb;
6150bacf	104	struct iphdr *iph = oldskb->nh.iph;
1da177e4 LT	105	struct tcphdr _otcph, oth, tcph;
	106	struct rtable *rt;
	107	u_int16_t tmp_port;
	108	u_int32_t tmp_addr;
6150bacf	109	unsigned int tcplen;
1da177e4 LT	110	int needs_ack;
	111	int hh_len;
	112
	113	/* IP header checks: fragment. */
	114	if (oldskb->nh.iph->frag_off & htons(IP_OFFSET))
	115	return;
	116
	117	oth = skb_header_pointer(oldskb, oldskb->nh.iph->ihl * 4,
	118	sizeof(_otcph), &_otcph);
	119	if (oth == NULL)
	120	return;
	121
	122	/* No RST for RST. */
	123	if (oth->rst)
	124	return;
	125
6150bacf PM	126	/* Check checksum */
	127	tcplen = oldskb->len - iph->ihl * 4;
	128	if (((hook != NF_IP_LOCAL_IN && oldskb->ip_summed != CHECKSUM_HW) \|\|
	129	(hook == NF_IP_LOCAL_IN &&
	130	oldskb->ip_summed != CHECKSUM_UNNECESSARY)) &&
	131	csum_tcpudp_magic(iph->saddr, iph->daddr, tcplen, IPPROTO_TCP,
	132	oldskb->ip_summed == CHECKSUM_HW ? oldskb->csum :
	133	skb_checksum(oldskb, iph->ihl * 4, tcplen, 0)))
	134	return;
	135
1da177e4 LT	136	if ((rt = route_reverse(oldskb, oth, hook)) == NULL)
	137	return;
	138
	139	hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
	140
	141	/* We need a linear, writeable skb. We also need to expand
	142	headroom in case hh_len of incoming interface < hh_len of
	143	outgoing interface */
	144	nskb = skb_copy_expand(oldskb, hh_len, skb_tailroom(oldskb),
	145	GFP_ATOMIC);
	146	if (!nskb) {
	147	dst_release(&rt->u.dst);
	148	return;
	149	}
	150
	151	dst_release(nskb->dst);
	152	nskb->dst = &rt->u.dst;
	153
	154	/* This packet will not be the same as the other: clear nf fields */
	155	nf_reset(nskb);
1da177e4	156	nskb->nfmark = 0;
1da177e4 LT	157
	158	tcph = (struct tcphdr )((u_int32_t)nskb->nh.iph + nskb->nh.iph->ihl);
	159
	160	/* Swap source and dest */
	161	tmp_addr = nskb->nh.iph->saddr;
	162	nskb->nh.iph->saddr = nskb->nh.iph->daddr;
	163	nskb->nh.iph->daddr = tmp_addr;
	164	tmp_port = tcph->source;
	165	tcph->source = tcph->dest;
	166	tcph->dest = tmp_port;
	167
	168	/* Truncate to length (no data) */
	169	tcph->doff = sizeof(struct tcphdr)/4;
	170	skb_trim(nskb, nskb->nh.iph->ihl*4 + sizeof(struct tcphdr));
	171	nskb->nh.iph->tot_len = htons(nskb->len);
	172
	173	if (tcph->ack) {
	174	needs_ack = 0;
	175	tcph->seq = oth->ack_seq;
	176	tcph->ack_seq = 0;
	177	} else {
	178	needs_ack = 1;
	179	tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin
	180	+ oldskb->len - oldskb->nh.iph->ihl*4
	181	- (oth->doff<<2));
	182	tcph->seq = 0;
	183	}
	184
	185	/* Reset flags */
	186	((u_int8_t *)tcph)[13] = 0;
	187	tcph->rst = 1;
	188	tcph->ack = needs_ack;
	189
	190	tcph->window = 0;
	191	tcph->urg_ptr = 0;
	192
	193	/* Adjust TCP checksum */
	194	tcph->check = 0;
	195	tcph->check = tcp_v4_check(tcph, sizeof(struct tcphdr),
	196	nskb->nh.iph->saddr,
	197	nskb->nh.iph->daddr,
	198	csum_partial((char *)tcph,
	199	sizeof(struct tcphdr), 0));
	200
	201	/* Adjust IP TTL, DF */
e8eaedf2	202	nskb->nh.iph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT);
1da177e4 LT	203	/* Set DF, id = 0 */
	204	nskb->nh.iph->frag_off = htons(IP_DF);
	205	nskb->nh.iph->id = 0;
	206
	207	/* Adjust IP checksum */
	208	nskb->nh.iph->check = 0;
	209	nskb->nh.iph->check = ip_fast_csum((unsigned char *)nskb->nh.iph,
	210	nskb->nh.iph->ihl);
	211
	212	/* "Never happens" */
	213	if (nskb->len > dst_mtu(nskb->dst))
	214	goto free_nskb;
	215
	216	nf_ct_attach(nskb, oldskb);
	217
	218	NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, nskb, NULL, nskb->dst->dev,
	219	dst_output);
	220	return;
	221
	222	free_nskb:
	223	kfree_skb(nskb);
	224	}
	225
	226	static inline void send_unreach(struct sk_buff *skb_in, int code)
	227	{
	228	icmp_send(skb_in, ICMP_DEST_UNREACH, code, 0);
	229	}
	230
	231	static unsigned int reject(struct sk_buff **pskb,
	232	const struct net_device *in,
	233	const struct net_device *out,
	234	unsigned int hooknum,
c4986734	235	const struct xt_target *target,
1da177e4 LT	236	const void *targinfo,
	237	void *userinfo)
	238	{
	239	const struct ipt_reject_info *reject = targinfo;
	240
	241	/* Our naive response construction doesn't deal with IP
	242	options, and probably shouldn't try. */
	243	if ((*pskb)->nh.iph->ihl<<2 != sizeof(struct iphdr))
	244	return NF_DROP;
	245
	246	/* WARNING: This code causes reentry within iptables.
	247	This means that the iptables jump stack is now crap. We
	248	must return an absolute verdict. --RR */
	249	switch (reject->with) {
	250	case IPT_ICMP_NET_UNREACHABLE:
	251	send_unreach(*pskb, ICMP_NET_UNREACH);
	252	break;
	253	case IPT_ICMP_HOST_UNREACHABLE:
	254	send_unreach(*pskb, ICMP_HOST_UNREACH);
	255	break;
	256	case IPT_ICMP_PROT_UNREACHABLE:
	257	send_unreach(*pskb, ICMP_PROT_UNREACH);
	258	break;
	259	case IPT_ICMP_PORT_UNREACHABLE:
	260	send_unreach(*pskb, ICMP_PORT_UNREACH);
	261	break;
	262	case IPT_ICMP_NET_PROHIBITED:
	263	send_unreach(*pskb, ICMP_NET_ANO);
	264	break;
	265	case IPT_ICMP_HOST_PROHIBITED:
	266	send_unreach(*pskb, ICMP_HOST_ANO);
	267	break;
	268	case IPT_ICMP_ADMIN_PROHIBITED:
	269	send_unreach(*pskb, ICMP_PKT_FILTERED);
	270	break;
	271	case IPT_TCP_RESET:
	272	send_reset(*pskb, hooknum);
	273	case IPT_ICMP_ECHOREPLY:
	274	/* Doesn't happen. */
	275	break;
	276	}
	277
	278	return NF_DROP;
	279	}
	280
	281	static int check(const char *tablename,
2e4e6a17	282	const void *e_void,
c4986734	283	const struct xt_target *target,
1da177e4 LT	284	void *targinfo,
	285	unsigned int targinfosize,
	286	unsigned int hook_mask)
	287	{
	288	const struct ipt_reject_info *rejinfo = targinfo;
2e4e6a17	289	const struct ipt_entry *e = e_void;
1da177e4	290
1da177e4 LT	291	if (rejinfo->with == IPT_ICMP_ECHOREPLY) {
	292	printk("REJECT: ECHOREPLY no longer supported.\n");
	293	return 0;
	294	} else if (rejinfo->with == IPT_TCP_RESET) {
	295	/* Must specify that it's a TCP packet */
	296	if (e->ip.proto != IPPROTO_TCP
	297	\|\| (e->ip.invflags & IPT_INV_PROTO)) {
	298	DEBUGP("REJECT: TCP_RESET invalid for non-tcp\n");
	299	return 0;
	300	}
	301	}
1da177e4 LT	302	return 1;
	303	}
	304
	305	static struct ipt_target ipt_reject_reg = {
	306	.name = "REJECT",
	307	.target = reject,
1d5cd909 PM	308	.targetsize = sizeof(struct ipt_reject_info),
	309	.table = "filter",
	310	.hooks = (1 << NF_IP_LOCAL_IN) \| (1 << NF_IP_FORWARD) \|
	311	(1 << NF_IP_LOCAL_OUT),
1da177e4 LT	312	.checkentry = check,
	313	.me = THIS_MODULE,
	314	};
	315
	316	static int __init init(void)
	317	{
	318	return ipt_register_target(&ipt_reject_reg);
	319	}
	320
	321	static void __exit fini(void)
	322	{
	323	ipt_unregister_target(&ipt_reject_reg);
	324	}
	325
	326	module_init(init);
	327	module_exit(fini);