[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/sched.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>
	10	#include <linux/sched.h>
	11	#include <linux/timer.h>
	12	#include <linux/netfilter.h>
	13	#include <linux/in.h>
	14	#include <linux/icmp.h>
	15	#include <linux/seq_file.h>
fb286bb2	16	#include <linux/skbuff.h>
1da177e4 LT	17	#include <net/ip.h>
1da177e4 LT	18	#include <net/checksum.h>
1da177e4 LT	19	#include <linux/netfilter_ipv4.h>
	20	#include <linux/netfilter_ipv4/ip_conntrack.h>
	21	#include <linux/netfilter_ipv4/ip_conntrack_core.h>
	22	#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
	23
94aec08e	24	unsigned int ip_ct_icmp_timeout __read_mostly = 30*HZ;
1da177e4 LT	25
	26	#if 0
	27	#define DEBUGP printk
	28	#else
	29	#define DEBUGP(format, args...)
	30	#endif
	31
	32	static int icmp_pkt_to_tuple(const struct sk_buff *skb,
	33	unsigned int dataoff,
	34	struct ip_conntrack_tuple *tuple)
	35	{
	36	struct icmphdr _hdr, *hp;
	37
	38	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	39	if (hp == NULL)
	40	return 0;
	41
	42	tuple->dst.u.icmp.type = hp->type;
	43	tuple->src.u.icmp.id = hp->un.echo.id;
	44	tuple->dst.u.icmp.code = hp->code;
	45
	46	return 1;
	47	}
	48
90c4656e YK	49	/* Add 1; spaces filled with 0. */
	50	static const u_int8_t invmap[] = {
	51	[ICMP_ECHO] = ICMP_ECHOREPLY + 1,
	52	[ICMP_ECHOREPLY] = ICMP_ECHO + 1,
	53	[ICMP_TIMESTAMP] = ICMP_TIMESTAMPREPLY + 1,
	54	[ICMP_TIMESTAMPREPLY] = ICMP_TIMESTAMP + 1,
	55	[ICMP_INFO_REQUEST] = ICMP_INFO_REPLY + 1,
	56	[ICMP_INFO_REPLY] = ICMP_INFO_REQUEST + 1,
	57	[ICMP_ADDRESS] = ICMP_ADDRESSREPLY + 1,
	58	[ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1
	59	};
	60
1da177e4 LT	61	static int icmp_invert_tuple(struct ip_conntrack_tuple *tuple,
	62	const struct ip_conntrack_tuple *orig)
	63	{
1da177e4 LT	64	if (orig->dst.u.icmp.type >= sizeof(invmap)
	65	\|\| !invmap[orig->dst.u.icmp.type])
	66	return 0;
	67
	68	tuple->src.u.icmp.id = orig->src.u.icmp.id;
	69	tuple->dst.u.icmp.type = invmap[orig->dst.u.icmp.type] - 1;
	70	tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
	71	return 1;
	72	}
	73
	74	/* Print out the per-protocol part of the tuple. */
	75	static int icmp_print_tuple(struct seq_file *s,
	76	const struct ip_conntrack_tuple *tuple)
	77	{
	78	return seq_printf(s, "type=%u code=%u id=%u ",
	79	tuple->dst.u.icmp.type,
	80	tuple->dst.u.icmp.code,
	81	ntohs(tuple->src.u.icmp.id));
	82	}
	83
	84	/* Print out the private part of the conntrack. */
	85	static int icmp_print_conntrack(struct seq_file *s,
	86	const struct ip_conntrack *conntrack)
	87	{
	88	return 0;
	89	}
	90
	91	/* Returns verdict for packet, or -1 for invalid. */
	92	static int icmp_packet(struct ip_conntrack *ct,
	93	const struct sk_buff *skb,
	94	enum ip_conntrack_info ctinfo)
	95	{
	96	/* Try to delete connection immediately after all replies:
e905a9ed YH	97	won't actually vanish as we still have skb, and del_timer
	98	means this will only run once even if count hits zero twice
	99	(theoretically possible with SMP) */
1da177e4 LT	100	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
	101	if (atomic_dec_and_test(&ct->proto.icmp.count)
	102	&& del_timer(&ct->timeout))
	103	ct->timeout.function((unsigned long)ct);
	104	} else {
	105	atomic_inc(&ct->proto.icmp.count);
ac3247ba	106	ip_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
1da177e4 LT	107	ip_ct_refresh_acct(ct, ctinfo, skb, ip_ct_icmp_timeout);
	108	}
	109
	110	return NF_ACCEPT;
	111	}
	112
	113	/* Called when a new connection for this protocol found. */
	114	static int icmp_new(struct ip_conntrack *conntrack,
	115	const struct sk_buff *skb)
	116	{
e905a9ed	117	static const u_int8_t valid_new[] = {
90c4656e YK	118	[ICMP_ECHO] = 1,
	119	[ICMP_TIMESTAMP] = 1,
	120	[ICMP_INFO_REQUEST] = 1,
e905a9ed	121	[ICMP_ADDRESS] = 1
90c4656e YK	122	};
90c4656e YK	123
1da177e4 LT	124	if (conntrack->tuplehash[0].tuple.dst.u.icmp.type >= sizeof(valid_new)
	125	\|\| !valid_new[conntrack->tuplehash[0].tuple.dst.u.icmp.type]) {
	126	/* Can't create a new ICMP `conn' with this. */
	127	DEBUGP("icmp: can't create new conn with type %u\n",
	128	conntrack->tuplehash[0].tuple.dst.u.icmp.type);
	129	DUMP_TUPLE(&conntrack->tuplehash[0].tuple);
	130	return 0;
	131	}
	132	atomic_set(&conntrack->proto.icmp.count, 0);
	133	return 1;
	134	}
	135
	136	static int
	137	icmp_error_message(struct sk_buff *skb,
	138	enum ip_conntrack_info *ctinfo,
	139	unsigned int hooknum)
	140	{
	141	struct ip_conntrack_tuple innertuple, origtuple;
	142	struct {
	143	struct icmphdr icmp;
	144	struct iphdr ip;
	145	} _in, *inside;
	146	struct ip_conntrack_protocol *innerproto;
	147	struct ip_conntrack_tuple_hash *h;
	148	int dataoff;
	149
	150	IP_NF_ASSERT(skb->nfct == NULL);
	151
	152	/* Not enough header? */
	153	inside = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_in), &_in);
	154	if (inside == NULL)
d63a9281	155	return -NF_ACCEPT;
1da177e4 LT	156
	157	/* Ignore ICMP's containing fragments (shouldn't happen) */
	158	if (inside->ip.frag_off & htons(IP_OFFSET)) {
	159	DEBUGP("icmp_error_track: fragment of proto %u\n",
	160	inside->ip.protocol);
d63a9281	161	return -NF_ACCEPT;
1da177e4 LT	162	}
1da177e4 LT	163
080774a2	164	innerproto = ip_conntrack_proto_find_get(inside->ip.protocol);
1da177e4 LT	165	dataoff = skb->nh.iph->ihl4 + sizeof(inside->icmp) + inside->ip.ihl4;
	166	/* Are they talking about one of our connections? */
	167	if (!ip_ct_get_tuple(&inside->ip, skb, dataoff, &origtuple, innerproto)) {
	168	DEBUGP("icmp_error: ! get_tuple p=%u", inside->ip.protocol);
080774a2	169	ip_conntrack_proto_put(innerproto);
d63a9281	170	return -NF_ACCEPT;
1da177e4 LT	171	}
	172
	173	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	174	been preserved inside the ICMP. */
	175	if (!ip_ct_invert_tuple(&innertuple, &origtuple, innerproto)) {
	176	DEBUGP("icmp_error_track: Can't invert tuple\n");
080774a2	177	ip_conntrack_proto_put(innerproto);
d63a9281	178	return -NF_ACCEPT;
1da177e4	179	}
080774a2	180	ip_conntrack_proto_put(innerproto);
1da177e4 LT	181
	182	*ctinfo = IP_CT_RELATED;
	183
	184	h = ip_conntrack_find_get(&innertuple, NULL);
	185	if (!h) {
	186	/* Locally generated ICMPs will match inverted if they
	187	haven't been SNAT'ed yet */
	188	/* FIXME: NAT code has to handle half-done double NAT --RR */
	189	if (hooknum == NF_IP_LOCAL_OUT)
	190	h = ip_conntrack_find_get(&origtuple, NULL);
	191
	192	if (!h) {
	193	DEBUGP("icmp_error_track: no match\n");
d63a9281	194	return -NF_ACCEPT;
1da177e4 LT	195	}
	196	/* Reverse direction from that found */
	197	if (DIRECTION(h) != IP_CT_DIR_REPLY)
	198	*ctinfo += IP_CT_IS_REPLY;
	199	} else {
	200	if (DIRECTION(h) == IP_CT_DIR_REPLY)
	201	*ctinfo += IP_CT_IS_REPLY;
	202	}
	203
	204	/* Update skb to refer to this connection */
	205	skb->nfct = &tuplehash_to_ctrack(h)->ct_general;
	206	skb->nfctinfo = *ctinfo;
	207	return -NF_ACCEPT;
	208	}
	209
	210	/* Small and modified version of icmp_rcv */
	211	static int
	212	icmp_error(struct sk_buff skb, enum ip_conntrack_info ctinfo,
	213	unsigned int hooknum)
	214	{
	215	struct icmphdr _ih, *icmph;
	216
	217	/* Not enough header? */
	218	icmph = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_ih), &_ih);
	219	if (icmph == NULL) {
	220	if (LOG_INVALID(IPPROTO_ICMP))
608c8e4f	221	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
1da177e4 LT	222	"ip_ct_icmp: short packet ");
	223	return -NF_ACCEPT;
	224	}
	225
	226	/* See ip_conntrack_proto_tcp.c */
39a27a35	227	if (ip_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
96f6bf82 PM	228	nf_ip_checksum(skb, hooknum, skb->nh.iph->ihl * 4, 0)) {
	229	if (LOG_INVALID(IPPROTO_ICMP))
	230	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	231	"ip_ct_icmp: bad ICMP checksum ");
	232	return -NF_ACCEPT;
1da177e4 LT	233	}
1da177e4 LT	234
1da177e4 LT	235	/*
	236	* 18 is the highest 'known' ICMP type. Anything else is a mystery
	237	*
	238	* RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
	239	* discarded.
	240	*/
	241	if (icmph->type > NR_ICMP_TYPES) {
	242	if (LOG_INVALID(IPPROTO_ICMP))
608c8e4f	243	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
1da177e4 LT	244	"ip_ct_icmp: invalid ICMP type ");
	245	return -NF_ACCEPT;
	246	}
	247
	248	/* Need to track icmp error message? */
	249	if (icmph->type != ICMP_DEST_UNREACH
	250	&& icmph->type != ICMP_SOURCE_QUENCH
	251	&& icmph->type != ICMP_TIME_EXCEEDED
	252	&& icmph->type != ICMP_PARAMETERPROB
	253	&& icmph->type != ICMP_REDIRECT)
	254	return NF_ACCEPT;
	255
	256	return icmp_error_message(skb, ctinfo, hooknum);
	257	}
	258
080774a2 HW	259	#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) \|\| \
	260	defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
	261	static int icmp_tuple_to_nfattr(struct sk_buff *skb,
	262	const struct ip_conntrack_tuple *t)
	263	{
cdcb71bf	264	NFA_PUT(skb, CTA_PROTO_ICMP_ID, sizeof(__be16),
080774a2 HW	265	&t->src.u.icmp.id);
	266	NFA_PUT(skb, CTA_PROTO_ICMP_TYPE, sizeof(u_int8_t),
	267	&t->dst.u.icmp.type);
	268	NFA_PUT(skb, CTA_PROTO_ICMP_CODE, sizeof(u_int8_t),
	269	&t->dst.u.icmp.code);
	270
080774a2 HW	271	return 0;
	272
	273	nfattr_failure:
	274	return -1;
	275	}
	276
	277	static int icmp_nfattr_to_tuple(struct nfattr *tb[],
	278	struct ip_conntrack_tuple *tuple)
	279	{
	280	if (!tb[CTA_PROTO_ICMP_TYPE-1]
439a9994 KPO	281	\|\| !tb[CTA_PROTO_ICMP_CODE-1]
439a9994 KPO	282	\|\| !tb[CTA_PROTO_ICMP_ID-1])
90c4656e	283	return -EINVAL;
080774a2	284
e905a9ed	285	tuple->dst.u.icmp.type =
080774a2 HW	286	(u_int8_t )NFA_DATA(tb[CTA_PROTO_ICMP_TYPE-1]);
	287	tuple->dst.u.icmp.code =
	288	(u_int8_t )NFA_DATA(tb[CTA_PROTO_ICMP_CODE-1]);
	289	tuple->src.u.icmp.id =
cdcb71bf	290	(__be16 )NFA_DATA(tb[CTA_PROTO_ICMP_ID-1]);
080774a2	291
90c4656e YK	292	if (tuple->dst.u.icmp.type >= sizeof(invmap)
	293	\|\| !invmap[tuple->dst.u.icmp.type])
	294	return -EINVAL;
	295
080774a2 HW	296	return 0;
	297	}
	298	#endif
	299
1da177e4 LT	300	struct ip_conntrack_protocol ip_conntrack_protocol_icmp =
	301	{
	302	.proto = IPPROTO_ICMP,
	303	.name = "icmp",
	304	.pkt_to_tuple = icmp_pkt_to_tuple,
	305	.invert_tuple = icmp_invert_tuple,
	306	.print_tuple = icmp_print_tuple,
	307	.print_conntrack = icmp_print_conntrack,
	308	.packet = icmp_packet,
	309	.new = icmp_new,
	310	.error = icmp_error,
080774a2 HW	311	#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) \|\| \
	312	defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
	313	.tuple_to_nfattr = icmp_tuple_to_nfattr,
	314	.nfattr_to_tuple = icmp_nfattr_to_tuple,
	315	#endif
1da177e4	316	};