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

/* (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/types.h>
#include <linux/timer.h>
#include <linux/netfilter.h>
#include <linux/in.h>
#include <linux/icmp.h>
#include <linux/seq_file.h>
#include <linux/skbuff.h>
#include <net/ip.h>
#include <net/checksum.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv4/ip_conntrack.h>
#include <linux/netfilter_ipv4/ip_conntrack_core.h>
#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>

unsigned int ip_ct_icmp_timeout __read_mostly = 30*HZ;

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

static int icmp_pkt_to_tuple(const struct sk_buff *skb,
			     unsigned int dataoff,
			     struct ip_conntrack_tuple *tuple)
{
	struct icmphdr _hdr, *hp;

	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	if (hp == NULL)
		return 0;

	tuple->dst.u.icmp.type = hp->type;
	tuple->src.u.icmp.id = hp->un.echo.id;
	tuple->dst.u.icmp.code = hp->code;

	return 1;
}

/* Add 1; spaces filled with 0. */
static const u_int8_t invmap[] = {
	[ICMP_ECHO] = ICMP_ECHOREPLY + 1,
	[ICMP_ECHOREPLY] = ICMP_ECHO + 1,
	[ICMP_TIMESTAMP] = ICMP_TIMESTAMPREPLY + 1,
	[ICMP_TIMESTAMPREPLY] = ICMP_TIMESTAMP + 1,
	[ICMP_INFO_REQUEST] = ICMP_INFO_REPLY + 1,
	[ICMP_INFO_REPLY] = ICMP_INFO_REQUEST + 1,
	[ICMP_ADDRESS] = ICMP_ADDRESSREPLY + 1,
	[ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1
};

static int icmp_invert_tuple(struct ip_conntrack_tuple *tuple,
			     const struct ip_conntrack_tuple *orig)
{
	if (orig->dst.u.icmp.type >= sizeof(invmap)
	    || !invmap[orig->dst.u.icmp.type])
		return 0;

	tuple->src.u.icmp.id = orig->src.u.icmp.id;
	tuple->dst.u.icmp.type = invmap[orig->dst.u.icmp.type] - 1;
	tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
	return 1;
}

/* Print out the per-protocol part of the tuple. */
static int icmp_print_tuple(struct seq_file *s,
			    const struct ip_conntrack_tuple *tuple)
{
	return seq_printf(s, "type=%u code=%u id=%u ",
			  tuple->dst.u.icmp.type,
			  tuple->dst.u.icmp.code,
			  ntohs(tuple->src.u.icmp.id));
}

/* Print out the private part of the conntrack. */
static int icmp_print_conntrack(struct seq_file *s,
				const struct ip_conntrack *conntrack)
{
	return 0;
}

/* Returns verdict for packet, or -1 for invalid. */
static int icmp_packet(struct ip_conntrack *ct,
		       const struct sk_buff *skb,
		       enum ip_conntrack_info ctinfo)
{
	/* Try to delete connection immediately after all replies:
	   won't actually vanish as we still have skb, and del_timer
	   means this will only run once even if count hits zero twice
	   (theoretically possible with SMP) */
	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
		if (atomic_dec_and_test(&ct->proto.icmp.count)
		    && del_timer(&ct->timeout))
			ct->timeout.function((unsigned long)ct);
	} else {
		atomic_inc(&ct->proto.icmp.count);
		ip_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
		ip_ct_refresh_acct(ct, ctinfo, skb, ip_ct_icmp_timeout);
	}

	return NF_ACCEPT;
}

/* Called when a new connection for this protocol found. */
static int icmp_new(struct ip_conntrack *conntrack,
		    const struct sk_buff *skb)
{
	static const u_int8_t valid_new[] = {
		[ICMP_ECHO] = 1,
		[ICMP_TIMESTAMP] = 1,
		[ICMP_INFO_REQUEST] = 1,
		[ICMP_ADDRESS] = 1
	};

	if (conntrack->tuplehash[0].tuple.dst.u.icmp.type >= sizeof(valid_new)
	    || !valid_new[conntrack->tuplehash[0].tuple.dst.u.icmp.type]) {
		/* Can't create a new ICMP `conn' with this. */
		DEBUGP("icmp: can't create new conn with type %u\n",
		       conntrack->tuplehash[0].tuple.dst.u.icmp.type);
		DUMP_TUPLE(&conntrack->tuplehash[0].tuple);
		return 0;
	}
	atomic_set(&conntrack->proto.icmp.count, 0);
	return 1;
}

static int
icmp_error_message(struct sk_buff *skb,
		   enum ip_conntrack_info *ctinfo,
		   unsigned int hooknum)
{
	struct ip_conntrack_tuple innertuple, origtuple;
	struct {
		struct icmphdr icmp;
		struct iphdr ip;
	} _in, *inside;
	struct ip_conntrack_protocol *innerproto;
	struct ip_conntrack_tuple_hash *h;
	int dataoff;

	IP_NF_ASSERT(skb->nfct == NULL);

	/* Not enough header? */
	inside = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_in), &_in);
	if (inside == NULL)
		return -NF_ACCEPT;

	/* Ignore ICMP's containing fragments (shouldn't happen) */
	if (inside->ip.frag_off & htons(IP_OFFSET)) {
		DEBUGP("icmp_error_track: fragment of proto %u\n",
		       inside->ip.protocol);
		return -NF_ACCEPT;
	}

	innerproto = ip_conntrack_proto_find_get(inside->ip.protocol);
	dataoff = skb->nh.iph->ihl*4 + sizeof(inside->icmp) + inside->ip.ihl*4;
	/* Are they talking about one of our connections? */
	if (!ip_ct_get_tuple(&inside->ip, skb, dataoff, &origtuple, innerproto)) {
		DEBUGP("icmp_error: ! get_tuple p=%u", inside->ip.protocol);
		ip_conntrack_proto_put(innerproto);
		return -NF_ACCEPT;
	}

	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	   been preserved inside the ICMP. */
	if (!ip_ct_invert_tuple(&innertuple, &origtuple, innerproto)) {
		DEBUGP("icmp_error_track: Can't invert tuple\n");
		ip_conntrack_proto_put(innerproto);
		return -NF_ACCEPT;
	}
	ip_conntrack_proto_put(innerproto);

	*ctinfo = IP_CT_RELATED;

	h = ip_conntrack_find_get(&innertuple, NULL);
	if (!h) {
		/* Locally generated ICMPs will match inverted if they
		   haven't been SNAT'ed yet */
		/* FIXME: NAT code has to handle half-done double NAT --RR */
		if (hooknum == NF_IP_LOCAL_OUT)
			h = ip_conntrack_find_get(&origtuple, NULL);

		if (!h) {
			DEBUGP("icmp_error_track: no match\n");
			return -NF_ACCEPT;
		}
		/* Reverse direction from that found */
		if (DIRECTION(h) != IP_CT_DIR_REPLY)
			*ctinfo += IP_CT_IS_REPLY;
	} else {
		if (DIRECTION(h) == IP_CT_DIR_REPLY)
			*ctinfo += IP_CT_IS_REPLY;
	}

	/* Update skb to refer to this connection */
	skb->nfct = &tuplehash_to_ctrack(h)->ct_general;
	skb->nfctinfo = *ctinfo;
	return -NF_ACCEPT;
}

/* Small and modified version of icmp_rcv */
static int
icmp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
	   unsigned int hooknum)
{
	struct icmphdr _ih, *icmph;

	/* Not enough header? */
	icmph = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_ih), &_ih);
	if (icmph == NULL) {
		if (LOG_INVALID(IPPROTO_ICMP))
			nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
				      "ip_ct_icmp: short packet ");
		return -NF_ACCEPT;
	}

	/* See ip_conntrack_proto_tcp.c */
	if (ip_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
	    nf_ip_checksum(skb, hooknum, skb->nh.iph->ihl * 4, 0)) {
		if (LOG_INVALID(IPPROTO_ICMP))
			nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
				      "ip_ct_icmp: bad ICMP checksum ");
		return -NF_ACCEPT;
	}

	/*
	 *	18 is the highest 'known' ICMP type. Anything else is a mystery
	 *
	 *	RFC 1122: 3.2.2  Unknown ICMP messages types MUST be silently
	 *		  discarded.
	 */
	if (icmph->type > NR_ICMP_TYPES) {
		if (LOG_INVALID(IPPROTO_ICMP))
			nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
				      "ip_ct_icmp: invalid ICMP type ");
		return -NF_ACCEPT;
	}

	/* Need to track icmp error message? */
	if (icmph->type != ICMP_DEST_UNREACH
	    && icmph->type != ICMP_SOURCE_QUENCH
	    && icmph->type != ICMP_TIME_EXCEEDED
	    && icmph->type != ICMP_PARAMETERPROB
	    && icmph->type != ICMP_REDIRECT)
		return NF_ACCEPT;

	return icmp_error_message(skb, ctinfo, hooknum);
}

#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
    defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
static int icmp_tuple_to_nfattr(struct sk_buff *skb,
				const struct ip_conntrack_tuple *t)
{
	NFA_PUT(skb, CTA_PROTO_ICMP_ID, sizeof(__be16),
		&t->src.u.icmp.id);
	NFA_PUT(skb, CTA_PROTO_ICMP_TYPE, sizeof(u_int8_t),
		&t->dst.u.icmp.type);
	NFA_PUT(skb, CTA_PROTO_ICMP_CODE, sizeof(u_int8_t),
		&t->dst.u.icmp.code);

	return 0;

nfattr_failure:
	return -1;
}

static int icmp_nfattr_to_tuple(struct nfattr *tb[],
				struct ip_conntrack_tuple *tuple)
{
	if (!tb[CTA_PROTO_ICMP_TYPE-1]
	    || !tb[CTA_PROTO_ICMP_CODE-1]
	    || !tb[CTA_PROTO_ICMP_ID-1])
		return -EINVAL;

	tuple->dst.u.icmp.type =
			*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMP_TYPE-1]);
	tuple->dst.u.icmp.code =
			*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMP_CODE-1]);
	tuple->src.u.icmp.id =
			*(__be16 *)NFA_DATA(tb[CTA_PROTO_ICMP_ID-1]);

	if (tuple->dst.u.icmp.type >= sizeof(invmap)
	    || !invmap[tuple->dst.u.icmp.type])
		return -EINVAL;

	return 0;
}
#endif

struct ip_conntrack_protocol ip_conntrack_protocol_icmp =
{
	.proto 			= IPPROTO_ICMP,
	.name 			= "icmp",
	.pkt_to_tuple		= icmp_pkt_to_tuple,
	.invert_tuple		= icmp_invert_tuple,
	.print_tuple		= icmp_print_tuple,
	.print_conntrack	= icmp_print_conntrack,
	.packet			= icmp_packet,
	.new			= icmp_new,
	.error			= icmp_error,
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
    defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
	.tuple_to_nfattr	= icmp_tuple_to_nfattr,
	.nfattr_to_tuple	= icmp_nfattr_to_tuple,
#endif
};
Commit	Line	Data
1da177e4 LT	1	/* (C) 1999-2001 Paul `Rusty' Russell
	2	* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
	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
	9	#include <linux/types.h>
1da177e4 LT	10	#include <linux/timer.h>
	11	#include <linux/netfilter.h>
	12	#include <linux/in.h>
	13	#include <linux/icmp.h>
	14	#include <linux/seq_file.h>
fb286bb2	15	#include <linux/skbuff.h>
1da177e4 LT	16	#include <net/ip.h>
1da177e4 LT	17	#include <net/checksum.h>
1da177e4 LT	18	#include <linux/netfilter_ipv4.h>
	19	#include <linux/netfilter_ipv4/ip_conntrack.h>
	20	#include <linux/netfilter_ipv4/ip_conntrack_core.h>
	21	#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
	22
94aec08e	23	unsigned int ip_ct_icmp_timeout __read_mostly = 30*HZ;
1da177e4 LT	24
	25	#if 0
	26	#define DEBUGP printk
	27	#else
	28	#define DEBUGP(format, args...)
	29	#endif
	30
	31	static int icmp_pkt_to_tuple(const struct sk_buff *skb,
	32	unsigned int dataoff,
	33	struct ip_conntrack_tuple *tuple)
	34	{
	35	struct icmphdr _hdr, *hp;
	36
	37	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	38	if (hp == NULL)
	39	return 0;
	40
	41	tuple->dst.u.icmp.type = hp->type;
	42	tuple->src.u.icmp.id = hp->un.echo.id;
	43	tuple->dst.u.icmp.code = hp->code;
	44
	45	return 1;
	46	}
	47
90c4656e YK	48	/* Add 1; spaces filled with 0. */
	49	static const u_int8_t invmap[] = {
	50	[ICMP_ECHO] = ICMP_ECHOREPLY + 1,
	51	[ICMP_ECHOREPLY] = ICMP_ECHO + 1,
	52	[ICMP_TIMESTAMP] = ICMP_TIMESTAMPREPLY + 1,
	53	[ICMP_TIMESTAMPREPLY] = ICMP_TIMESTAMP + 1,
	54	[ICMP_INFO_REQUEST] = ICMP_INFO_REPLY + 1,
	55	[ICMP_INFO_REPLY] = ICMP_INFO_REQUEST + 1,
	56	[ICMP_ADDRESS] = ICMP_ADDRESSREPLY + 1,
	57	[ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1
	58	};
	59
1da177e4 LT	60	static int icmp_invert_tuple(struct ip_conntrack_tuple *tuple,
	61	const struct ip_conntrack_tuple *orig)
	62	{
1da177e4 LT	63	if (orig->dst.u.icmp.type >= sizeof(invmap)
	64	\|\| !invmap[orig->dst.u.icmp.type])
	65	return 0;
	66
	67	tuple->src.u.icmp.id = orig->src.u.icmp.id;
	68	tuple->dst.u.icmp.type = invmap[orig->dst.u.icmp.type] - 1;
	69	tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
	70	return 1;
	71	}
	72
	73	/* Print out the per-protocol part of the tuple. */
	74	static int icmp_print_tuple(struct seq_file *s,
	75	const struct ip_conntrack_tuple *tuple)
	76	{
	77	return seq_printf(s, "type=%u code=%u id=%u ",
	78	tuple->dst.u.icmp.type,
	79	tuple->dst.u.icmp.code,
	80	ntohs(tuple->src.u.icmp.id));
	81	}
	82
	83	/* Print out the private part of the conntrack. */
	84	static int icmp_print_conntrack(struct seq_file *s,
	85	const struct ip_conntrack *conntrack)
	86	{
	87	return 0;
	88	}
	89
	90	/* Returns verdict for packet, or -1 for invalid. */
	91	static int icmp_packet(struct ip_conntrack *ct,
	92	const struct sk_buff *skb,
	93	enum ip_conntrack_info ctinfo)
	94	{
	95	/* Try to delete connection immediately after all replies:
e905a9ed YH	96	won't actually vanish as we still have skb, and del_timer
	97	means this will only run once even if count hits zero twice
	98	(theoretically possible with SMP) */
1da177e4 LT	99	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
	100	if (atomic_dec_and_test(&ct->proto.icmp.count)
	101	&& del_timer(&ct->timeout))
	102	ct->timeout.function((unsigned long)ct);
	103	} else {
	104	atomic_inc(&ct->proto.icmp.count);
ac3247ba	105	ip_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
1da177e4 LT	106	ip_ct_refresh_acct(ct, ctinfo, skb, ip_ct_icmp_timeout);
	107	}
	108
	109	return NF_ACCEPT;
	110	}
	111
	112	/* Called when a new connection for this protocol found. */
	113	static int icmp_new(struct ip_conntrack *conntrack,
	114	const struct sk_buff *skb)
	115	{
e905a9ed	116	static const u_int8_t valid_new[] = {
90c4656e YK	117	[ICMP_ECHO] = 1,
	118	[ICMP_TIMESTAMP] = 1,
	119	[ICMP_INFO_REQUEST] = 1,
e905a9ed	120	[ICMP_ADDRESS] = 1
90c4656e YK	121	};
90c4656e YK	122
1da177e4 LT	123	if (conntrack->tuplehash[0].tuple.dst.u.icmp.type >= sizeof(valid_new)
	124	\|\| !valid_new[conntrack->tuplehash[0].tuple.dst.u.icmp.type]) {
	125	/* Can't create a new ICMP `conn' with this. */
	126	DEBUGP("icmp: can't create new conn with type %u\n",
	127	conntrack->tuplehash[0].tuple.dst.u.icmp.type);
	128	DUMP_TUPLE(&conntrack->tuplehash[0].tuple);
	129	return 0;
	130	}
	131	atomic_set(&conntrack->proto.icmp.count, 0);
	132	return 1;
	133	}
	134
	135	static int
	136	icmp_error_message(struct sk_buff *skb,
	137	enum ip_conntrack_info *ctinfo,
	138	unsigned int hooknum)
	139	{
	140	struct ip_conntrack_tuple innertuple, origtuple;
	141	struct {
	142	struct icmphdr icmp;
	143	struct iphdr ip;
	144	} _in, *inside;
	145	struct ip_conntrack_protocol *innerproto;
	146	struct ip_conntrack_tuple_hash *h;
	147	int dataoff;
	148
	149	IP_NF_ASSERT(skb->nfct == NULL);
	150
	151	/* Not enough header? */
	152	inside = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_in), &_in);
	153	if (inside == NULL)
d63a9281	154	return -NF_ACCEPT;
1da177e4 LT	155
	156	/* Ignore ICMP's containing fragments (shouldn't happen) */
	157	if (inside->ip.frag_off & htons(IP_OFFSET)) {
	158	DEBUGP("icmp_error_track: fragment of proto %u\n",
	159	inside->ip.protocol);
d63a9281	160	return -NF_ACCEPT;
1da177e4 LT	161	}
1da177e4 LT	162
080774a2	163	innerproto = ip_conntrack_proto_find_get(inside->ip.protocol);
1da177e4 LT	164	dataoff = skb->nh.iph->ihl4 + sizeof(inside->icmp) + inside->ip.ihl4;
	165	/* Are they talking about one of our connections? */
	166	if (!ip_ct_get_tuple(&inside->ip, skb, dataoff, &origtuple, innerproto)) {
	167	DEBUGP("icmp_error: ! get_tuple p=%u", inside->ip.protocol);
080774a2	168	ip_conntrack_proto_put(innerproto);
d63a9281	169	return -NF_ACCEPT;
1da177e4 LT	170	}
	171
	172	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	173	been preserved inside the ICMP. */
	174	if (!ip_ct_invert_tuple(&innertuple, &origtuple, innerproto)) {
	175	DEBUGP("icmp_error_track: Can't invert tuple\n");
080774a2	176	ip_conntrack_proto_put(innerproto);
d63a9281	177	return -NF_ACCEPT;
1da177e4	178	}
080774a2	179	ip_conntrack_proto_put(innerproto);
1da177e4 LT	180
	181	*ctinfo = IP_CT_RELATED;
	182
	183	h = ip_conntrack_find_get(&innertuple, NULL);
	184	if (!h) {
	185	/* Locally generated ICMPs will match inverted if they
	186	haven't been SNAT'ed yet */
	187	/* FIXME: NAT code has to handle half-done double NAT --RR */
	188	if (hooknum == NF_IP_LOCAL_OUT)
	189	h = ip_conntrack_find_get(&origtuple, NULL);
	190
	191	if (!h) {
	192	DEBUGP("icmp_error_track: no match\n");
d63a9281	193	return -NF_ACCEPT;
1da177e4 LT	194	}
	195	/* Reverse direction from that found */
	196	if (DIRECTION(h) != IP_CT_DIR_REPLY)
	197	*ctinfo += IP_CT_IS_REPLY;
	198	} else {
	199	if (DIRECTION(h) == IP_CT_DIR_REPLY)
	200	*ctinfo += IP_CT_IS_REPLY;
	201	}
	202
	203	/* Update skb to refer to this connection */
	204	skb->nfct = &tuplehash_to_ctrack(h)->ct_general;
	205	skb->nfctinfo = *ctinfo;
	206	return -NF_ACCEPT;
	207	}
	208
	209	/* Small and modified version of icmp_rcv */
	210	static int
	211	icmp_error(struct sk_buff skb, enum ip_conntrack_info ctinfo,
	212	unsigned int hooknum)
	213	{
	214	struct icmphdr _ih, *icmph;
	215
	216	/* Not enough header? */
	217	icmph = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_ih), &_ih);
	218	if (icmph == NULL) {
	219	if (LOG_INVALID(IPPROTO_ICMP))
608c8e4f	220	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
1da177e4 LT	221	"ip_ct_icmp: short packet ");
	222	return -NF_ACCEPT;
	223	}
	224
	225	/* See ip_conntrack_proto_tcp.c */
39a27a35	226	if (ip_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
96f6bf82 PM	227	nf_ip_checksum(skb, hooknum, skb->nh.iph->ihl * 4, 0)) {
	228	if (LOG_INVALID(IPPROTO_ICMP))
	229	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	230	"ip_ct_icmp: bad ICMP checksum ");
	231	return -NF_ACCEPT;
1da177e4 LT	232	}
1da177e4 LT	233
1da177e4 LT	234	/*
	235	* 18 is the highest 'known' ICMP type. Anything else is a mystery
	236	*
	237	* RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
	238	* discarded.
	239	*/
	240	if (icmph->type > NR_ICMP_TYPES) {
	241	if (LOG_INVALID(IPPROTO_ICMP))
608c8e4f	242	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
1da177e4 LT	243	"ip_ct_icmp: invalid ICMP type ");
	244	return -NF_ACCEPT;
	245	}
	246
	247	/* Need to track icmp error message? */
	248	if (icmph->type != ICMP_DEST_UNREACH
	249	&& icmph->type != ICMP_SOURCE_QUENCH
	250	&& icmph->type != ICMP_TIME_EXCEEDED
	251	&& icmph->type != ICMP_PARAMETERPROB
	252	&& icmph->type != ICMP_REDIRECT)
	253	return NF_ACCEPT;
	254
	255	return icmp_error_message(skb, ctinfo, hooknum);
	256	}
	257
080774a2 HW	258	#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) \|\| \
	259	defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
	260	static int icmp_tuple_to_nfattr(struct sk_buff *skb,
	261	const struct ip_conntrack_tuple *t)
	262	{
cdcb71bf	263	NFA_PUT(skb, CTA_PROTO_ICMP_ID, sizeof(__be16),
080774a2 HW	264	&t->src.u.icmp.id);
	265	NFA_PUT(skb, CTA_PROTO_ICMP_TYPE, sizeof(u_int8_t),
	266	&t->dst.u.icmp.type);
	267	NFA_PUT(skb, CTA_PROTO_ICMP_CODE, sizeof(u_int8_t),
	268	&t->dst.u.icmp.code);
	269
080774a2 HW	270	return 0;
	271
	272	nfattr_failure:
	273	return -1;
	274	}
	275
	276	static int icmp_nfattr_to_tuple(struct nfattr *tb[],
	277	struct ip_conntrack_tuple *tuple)
	278	{
	279	if (!tb[CTA_PROTO_ICMP_TYPE-1]
439a9994 KPO	280	\|\| !tb[CTA_PROTO_ICMP_CODE-1]
439a9994 KPO	281	\|\| !tb[CTA_PROTO_ICMP_ID-1])
90c4656e	282	return -EINVAL;
080774a2	283
e905a9ed	284	tuple->dst.u.icmp.type =
080774a2 HW	285	(u_int8_t )NFA_DATA(tb[CTA_PROTO_ICMP_TYPE-1]);
	286	tuple->dst.u.icmp.code =
	287	(u_int8_t )NFA_DATA(tb[CTA_PROTO_ICMP_CODE-1]);
	288	tuple->src.u.icmp.id =
cdcb71bf	289	(__be16 )NFA_DATA(tb[CTA_PROTO_ICMP_ID-1]);
080774a2	290
90c4656e YK	291	if (tuple->dst.u.icmp.type >= sizeof(invmap)
	292	\|\| !invmap[tuple->dst.u.icmp.type])
	293	return -EINVAL;
	294
080774a2 HW	295	return 0;
	296	}
	297	#endif
	298
1da177e4 LT	299	struct ip_conntrack_protocol ip_conntrack_protocol_icmp =
	300	{
	301	.proto = IPPROTO_ICMP,
	302	.name = "icmp",
	303	.pkt_to_tuple = icmp_pkt_to_tuple,
	304	.invert_tuple = icmp_invert_tuple,
	305	.print_tuple = icmp_print_tuple,
	306	.print_conntrack = icmp_print_conntrack,
	307	.packet = icmp_packet,
	308	.new = icmp_new,
	309	.error = icmp_error,
080774a2 HW	310	#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) \|\| \
	311	defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
	312	.tuple_to_nfattr = icmp_tuple_to_nfattr,
	313	.nfattr_to_tuple = icmp_nfattr_to_tuple,
	314	#endif
1da177e4	315	};