[deliverable/linux.git] / net / ipv4 / netfilter / nf_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 <net/ip.h>
#include <net/checksum.h>
#include <linux/netfilter_ipv4.h>
#include <net/netfilter/nf_conntrack_tuple.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_core.h>

static unsigned long nf_ct_icmp_timeout __read_mostly = 30*HZ;

static int icmp_pkt_to_tuple(const struct sk_buff *skb,
			     unsigned int dataoff,
			     struct nf_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 nf_conntrack_tuple *tuple,
			     const struct nf_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 nf_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 nf_conn *conntrack)
{
	return 0;
}

/* Returns verdict for packet, or -1 for invalid. */
static int icmp_packet(struct nf_conn *ct,
		       const struct sk_buff *skb,
		       unsigned int dataoff,
		       enum ip_conntrack_info ctinfo,
		       int pf,
		       unsigned int hooknum)
{
	/* 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);
		nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
		nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmp_timeout);
	}

	return NF_ACCEPT;
}

/* Called when a new connection for this protocol found. */
static int icmp_new(struct nf_conn *conntrack,
		    const struct sk_buff *skb, unsigned int dataoff)
{
	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. */
		pr_debug("icmp: can't create new conn with type %u\n",
			 conntrack->tuplehash[0].tuple.dst.u.icmp.type);
		NF_CT_DUMP_TUPLE(&conntrack->tuplehash[0].tuple);
		return 0;
	}
	atomic_set(&conntrack->proto.icmp.count, 0);
	return 1;
}

extern struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4;
/* Returns conntrack if it dealt with ICMP, and filled in skb fields */
static int
icmp_error_message(struct sk_buff *skb,
		 enum ip_conntrack_info *ctinfo,
		 unsigned int hooknum)
{
	struct nf_conntrack_tuple innertuple, origtuple;
	struct nf_conntrack_l4proto *innerproto;
	struct nf_conntrack_tuple_hash *h;

	NF_CT_ASSERT(skb->nfct == NULL);

	/* Are they talking about one of our connections? */
	if (!nf_ct_get_tuplepr(skb,
			       skb_network_offset(skb) + ip_hdrlen(skb)
						       + sizeof(struct icmphdr),
			       PF_INET, &origtuple)) {
		pr_debug("icmp_error_message: failed to get tuple\n");
		return -NF_ACCEPT;
	}

	/* rcu_read_lock()ed by nf_hook_slow */
	innerproto = __nf_ct_l4proto_find(PF_INET, origtuple.dst.protonum);

	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	   been preserved inside the ICMP. */
	if (!nf_ct_invert_tuple(&innertuple, &origtuple,
				&nf_conntrack_l3proto_ipv4, innerproto)) {
		pr_debug("icmp_error_message: no match\n");
		return -NF_ACCEPT;
	}

	*ctinfo = IP_CT_RELATED;

	h = nf_conntrack_find_get(&innertuple);
	if (!h) {
		pr_debug("icmp_error_message: no match\n");
		return -NF_ACCEPT;
	}

	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
		*ctinfo += IP_CT_IS_REPLY;

	/* Update skb to refer to this connection */
	skb->nfct = &nf_ct_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, unsigned int dataoff,
	   enum ip_conntrack_info *ctinfo, int pf, unsigned int hooknum)
{
	struct icmphdr _ih, *icmph;

	/* Not enough header? */
	icmph = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_ih), &_ih);
	if (icmph == NULL) {
		if (LOG_INVALID(IPPROTO_ICMP))
			nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
				      "nf_ct_icmp: short packet ");
		return -NF_ACCEPT;
	}

	/* See ip_conntrack_proto_tcp.c */
	if (nf_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
	    nf_ip_checksum(skb, hooknum, dataoff, 0)) {
		if (LOG_INVALID(IPPROTO_ICMP))
			nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
				      "nf_ct_icmp: bad HW 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,
				      "nf_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_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)

#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>

static int icmp_tuple_to_nfattr(struct sk_buff *skb,
				const struct nf_conntrack_tuple *t)
{
	NLA_PUT(skb, CTA_PROTO_ICMP_ID, sizeof(u_int16_t),
		&t->src.u.icmp.id);
	NLA_PUT(skb, CTA_PROTO_ICMP_TYPE, sizeof(u_int8_t),
		&t->dst.u.icmp.type);
	NLA_PUT(skb, CTA_PROTO_ICMP_CODE, sizeof(u_int8_t),
		&t->dst.u.icmp.code);

	return 0;

nla_put_failure:
	return -1;
}

static const size_t cta_min_proto[CTA_PROTO_MAX+1] = {
	[CTA_PROTO_ICMP_TYPE]	= sizeof(u_int8_t),
	[CTA_PROTO_ICMP_CODE]	= sizeof(u_int8_t),
	[CTA_PROTO_ICMP_ID]	= sizeof(u_int16_t)
};

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

	if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
		return -EINVAL;

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

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

	return 0;
}
#endif

#ifdef CONFIG_SYSCTL
static struct ctl_table_header *icmp_sysctl_header;
static struct ctl_table icmp_sysctl_table[] = {
	{
		.ctl_name	= NET_NF_CONNTRACK_ICMP_TIMEOUT,
		.procname	= "nf_conntrack_icmp_timeout",
		.data		= &nf_ct_icmp_timeout,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.ctl_name = 0
	}
};
#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
static struct ctl_table icmp_compat_sysctl_table[] = {
	{
		.ctl_name	= NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT,
		.procname	= "ip_conntrack_icmp_timeout",
		.data		= &nf_ct_icmp_timeout,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.ctl_name = 0
	}
};
#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
#endif /* CONFIG_SYSCTL */

struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp __read_mostly =
{
	.l3proto		= PF_INET,
	.l4proto		= 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,
	.destroy		= NULL,
	.me			= NULL,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
	.tuple_to_nfattr	= icmp_tuple_to_nfattr,
	.nfattr_to_tuple	= icmp_nfattr_to_tuple,
#endif
#ifdef CONFIG_SYSCTL
	.ctl_table_header	= &icmp_sysctl_header,
	.ctl_table		= icmp_sysctl_table,
#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	.ctl_compat_table	= icmp_compat_sysctl_table,
#endif
#endif
};
Commit	Line	Data
9fb9cbb1 YK	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.
9fb9cbb1 YK	7	*/
	8
	9	#include <linux/types.h>
9fb9cbb1 YK	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>
	15	#include <net/ip.h>
	16	#include <net/checksum.h>
	17	#include <linux/netfilter_ipv4.h>
	18	#include <net/netfilter/nf_conntrack_tuple.h>
605dcad6	19	#include <net/netfilter/nf_conntrack_l4proto.h>
9fb9cbb1 YK	20	#include <net/netfilter/nf_conntrack_core.h>
9fb9cbb1 YK	21
933a41e7	22	static unsigned long nf_ct_icmp_timeout __read_mostly = 30*HZ;
9fb9cbb1	23
9fb9cbb1 YK	24	static int icmp_pkt_to_tuple(const struct sk_buff *skb,
	25	unsigned int dataoff,
	26	struct nf_conntrack_tuple *tuple)
	27	{
	28	struct icmphdr _hdr, *hp;
	29
	30	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	31	if (hp == NULL)
	32	return 0;
	33
	34	tuple->dst.u.icmp.type = hp->type;
	35	tuple->src.u.icmp.id = hp->un.echo.id;
	36	tuple->dst.u.icmp.code = hp->code;
	37
	38	return 1;
	39	}
	40
c1d10adb PNA	41	/* Add 1; spaces filled with 0. */
	42	static const u_int8_t invmap[] = {
	43	[ICMP_ECHO] = ICMP_ECHOREPLY + 1,
	44	[ICMP_ECHOREPLY] = ICMP_ECHO + 1,
	45	[ICMP_TIMESTAMP] = ICMP_TIMESTAMPREPLY + 1,
	46	[ICMP_TIMESTAMPREPLY] = ICMP_TIMESTAMP + 1,
	47	[ICMP_INFO_REQUEST] = ICMP_INFO_REPLY + 1,
	48	[ICMP_INFO_REPLY] = ICMP_INFO_REQUEST + 1,
	49	[ICMP_ADDRESS] = ICMP_ADDRESSREPLY + 1,
	50	[ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1
	51	};
	52
9fb9cbb1 YK	53	static int icmp_invert_tuple(struct nf_conntrack_tuple *tuple,
	54	const struct nf_conntrack_tuple *orig)
	55	{
9fb9cbb1 YK	56	if (orig->dst.u.icmp.type >= sizeof(invmap)
	57	\|\| !invmap[orig->dst.u.icmp.type])
	58	return 0;
	59
	60	tuple->src.u.icmp.id = orig->src.u.icmp.id;
	61	tuple->dst.u.icmp.type = invmap[orig->dst.u.icmp.type] - 1;
	62	tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
	63	return 1;
	64	}
	65
	66	/* Print out the per-protocol part of the tuple. */
	67	static int icmp_print_tuple(struct seq_file *s,
	68	const struct nf_conntrack_tuple *tuple)
	69	{
	70	return seq_printf(s, "type=%u code=%u id=%u ",
	71	tuple->dst.u.icmp.type,
	72	tuple->dst.u.icmp.code,
	73	ntohs(tuple->src.u.icmp.id));
	74	}
	75
	76	/* Print out the private part of the conntrack. */
	77	static int icmp_print_conntrack(struct seq_file *s,
	78	const struct nf_conn *conntrack)
	79	{
	80	return 0;
	81	}
	82
	83	/* Returns verdict for packet, or -1 for invalid. */
	84	static int icmp_packet(struct nf_conn *ct,
	85	const struct sk_buff *skb,
	86	unsigned int dataoff,
	87	enum ip_conntrack_info ctinfo,
	88	int pf,
	89	unsigned int hooknum)
	90	{
	91	/* Try to delete connection immediately after all replies:
e905a9ed YH	92	won't actually vanish as we still have skb, and del_timer
	93	means this will only run once even if count hits zero twice
	94	(theoretically possible with SMP) */
9fb9cbb1 YK	95	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
	96	if (atomic_dec_and_test(&ct->proto.icmp.count)
	97	&& del_timer(&ct->timeout))
	98	ct->timeout.function((unsigned long)ct);
	99	} else {
	100	atomic_inc(&ct->proto.icmp.count);
	101	nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
	102	nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmp_timeout);
	103	}
	104
	105	return NF_ACCEPT;
	106	}
	107
	108	/* Called when a new connection for this protocol found. */
	109	static int icmp_new(struct nf_conn *conntrack,
	110	const struct sk_buff *skb, unsigned int dataoff)
	111	{
c1d10adb PNA	112	static const u_int8_t valid_new[] = {
	113	[ICMP_ECHO] = 1,
	114	[ICMP_TIMESTAMP] = 1,
	115	[ICMP_INFO_REQUEST] = 1,
	116	[ICMP_ADDRESS] = 1
	117	};
9fb9cbb1 YK	118
	119	if (conntrack->tuplehash[0].tuple.dst.u.icmp.type >= sizeof(valid_new)
	120	\|\| !valid_new[conntrack->tuplehash[0].tuple.dst.u.icmp.type]) {
	121	/* Can't create a new ICMP `conn' with this. */
0d53778e PM	122	pr_debug("icmp: can't create new conn with type %u\n",
0d53778e PM	123	conntrack->tuplehash[0].tuple.dst.u.icmp.type);
9fb9cbb1 YK	124	NF_CT_DUMP_TUPLE(&conntrack->tuplehash[0].tuple);
	125	return 0;
	126	}
	127	atomic_set(&conntrack->proto.icmp.count, 0);
	128	return 1;
	129	}
	130
	131	extern struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4;
	132	/* Returns conntrack if it dealt with ICMP, and filled in skb fields */
	133	static int
	134	icmp_error_message(struct sk_buff *skb,
e905a9ed YH	135	enum ip_conntrack_info *ctinfo,
e905a9ed YH	136	unsigned int hooknum)
9fb9cbb1 YK	137	{
9fb9cbb1 YK	138	struct nf_conntrack_tuple innertuple, origtuple;
605dcad6	139	struct nf_conntrack_l4proto *innerproto;
9fb9cbb1	140	struct nf_conntrack_tuple_hash *h;
9fb9cbb1 YK	141
	142	NF_CT_ASSERT(skb->nfct == NULL);
	143
e2a3123f YK	144	/* Are they talking about one of our connections? */
	145	if (!nf_ct_get_tuplepr(skb,
	146	skb_network_offset(skb) + ip_hdrlen(skb)
	147	+ sizeof(struct icmphdr),
	148	PF_INET, &origtuple)) {
	149	pr_debug("icmp_error_message: failed to get tuple\n");
9fb9cbb1 YK	150	return -NF_ACCEPT;
	151	}
	152
923f4902	153	/* rcu_read_lock()ed by nf_hook_slow */
e2a3123f	154	innerproto = __nf_ct_l4proto_find(PF_INET, origtuple.dst.protonum);
9fb9cbb1	155
e905a9ed YH	156	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	157	been preserved inside the ICMP. */
	158	if (!nf_ct_invert_tuple(&innertuple, &origtuple,
9fb9cbb1	159	&nf_conntrack_l3proto_ipv4, innerproto)) {
0d53778e	160	pr_debug("icmp_error_message: no match\n");
9fb9cbb1 YK	161	return -NF_ACCEPT;
	162	}
	163
	164	*ctinfo = IP_CT_RELATED;
	165
330f7db5	166	h = nf_conntrack_find_get(&innertuple);
9fb9cbb1	167	if (!h) {
130e7a83 YK	168	pr_debug("icmp_error_message: no match\n");
130e7a83 YK	169	return -NF_ACCEPT;
9fb9cbb1 YK	170	}
9fb9cbb1 YK	171
130e7a83 YK	172	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
	173	*ctinfo += IP_CT_IS_REPLY;
	174
e905a9ed YH	175	/* Update skb to refer to this connection */
	176	skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
	177	skb->nfctinfo = *ctinfo;
	178	return -NF_ACCEPT;
9fb9cbb1 YK	179	}
	180
	181	/* Small and modified version of icmp_rcv */
	182	static int
	183	icmp_error(struct sk_buff *skb, unsigned int dataoff,
	184	enum ip_conntrack_info *ctinfo, int pf, unsigned int hooknum)
	185	{
	186	struct icmphdr _ih, *icmph;
	187
	188	/* Not enough header? */
c9bdd4b5	189	icmph = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_ih), &_ih);
9fb9cbb1 YK	190	if (icmph == NULL) {
	191	if (LOG_INVALID(IPPROTO_ICMP))
	192	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	193	"nf_ct_icmp: short packet ");
	194	return -NF_ACCEPT;
	195	}
	196
	197	/* See ip_conntrack_proto_tcp.c */
39a27a35	198	if (nf_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
96f6bf82	199	nf_ip_checksum(skb, hooknum, dataoff, 0)) {
9fb9cbb1 YK	200	if (LOG_INVALID(IPPROTO_ICMP))
	201	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	202	"nf_ct_icmp: bad HW ICMP checksum ");
	203	return -NF_ACCEPT;
9fb9cbb1 YK	204	}
9fb9cbb1 YK	205
9fb9cbb1 YK	206	/*
	207	* 18 is the highest 'known' ICMP type. Anything else is a mystery
	208	*
	209	* RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
	210	* discarded.
	211	*/
	212	if (icmph->type > NR_ICMP_TYPES) {
	213	if (LOG_INVALID(IPPROTO_ICMP))
	214	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	215	"nf_ct_icmp: invalid ICMP type ");
	216	return -NF_ACCEPT;
	217	}
	218
	219	/* Need to track icmp error message? */
	220	if (icmph->type != ICMP_DEST_UNREACH
	221	&& icmph->type != ICMP_SOURCE_QUENCH
	222	&& icmph->type != ICMP_TIME_EXCEEDED
	223	&& icmph->type != ICMP_PARAMETERPROB
	224	&& icmph->type != ICMP_REDIRECT)
	225	return NF_ACCEPT;
	226
	227	return icmp_error_message(skb, ctinfo, hooknum);
	228	}
	229
e281db5c	230	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
c1d10adb PNA	231
	232	#include <linux/netfilter/nfnetlink.h>
	233	#include <linux/netfilter/nfnetlink_conntrack.h>
	234
	235	static int icmp_tuple_to_nfattr(struct sk_buff *skb,
	236	const struct nf_conntrack_tuple *t)
	237	{
df6fb868	238	NLA_PUT(skb, CTA_PROTO_ICMP_ID, sizeof(u_int16_t),
c1d10adb	239	&t->src.u.icmp.id);
df6fb868	240	NLA_PUT(skb, CTA_PROTO_ICMP_TYPE, sizeof(u_int8_t),
c1d10adb	241	&t->dst.u.icmp.type);
df6fb868	242	NLA_PUT(skb, CTA_PROTO_ICMP_CODE, sizeof(u_int8_t),
c1d10adb PNA	243	&t->dst.u.icmp.code);
	244
	245	return 0;
	246
df6fb868	247	nla_put_failure:
c1d10adb PNA	248	return -1;
	249	}
	250
df6fb868 PM	251	static const size_t cta_min_proto[CTA_PROTO_MAX+1] = {
	252	[CTA_PROTO_ICMP_TYPE] = sizeof(u_int8_t),
	253	[CTA_PROTO_ICMP_CODE] = sizeof(u_int8_t),
	254	[CTA_PROTO_ICMP_ID] = sizeof(u_int16_t)
c1d10adb PNA	255	};
c1d10adb PNA	256
df6fb868	257	static int icmp_nfattr_to_tuple(struct nlattr *tb[],
c1d10adb PNA	258	struct nf_conntrack_tuple *tuple)
c1d10adb PNA	259	{
df6fb868 PM	260	if (!tb[CTA_PROTO_ICMP_TYPE]
	261	\|\| !tb[CTA_PROTO_ICMP_CODE]
	262	\|\| !tb[CTA_PROTO_ICMP_ID])
c1d10adb PNA	263	return -EINVAL;
	264
	265	if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
	266	return -EINVAL;
	267
e905a9ed	268	tuple->dst.u.icmp.type =
df6fb868	269	(u_int8_t )nla_data(tb[CTA_PROTO_ICMP_TYPE]);
c1d10adb	270	tuple->dst.u.icmp.code =
df6fb868	271	(u_int8_t )nla_data(tb[CTA_PROTO_ICMP_CODE]);
c1d10adb	272	tuple->src.u.icmp.id =
df6fb868	273	(__be16 )nla_data(tb[CTA_PROTO_ICMP_ID]);
c1d10adb PNA	274
	275	if (tuple->dst.u.icmp.type >= sizeof(invmap)
	276	\|\| !invmap[tuple->dst.u.icmp.type])
	277	return -EINVAL;
	278
	279	return 0;
	280	}
	281	#endif
	282
933a41e7 PM	283	#ifdef CONFIG_SYSCTL
	284	static struct ctl_table_header *icmp_sysctl_header;
	285	static struct ctl_table icmp_sysctl_table[] = {
	286	{
	287	.ctl_name = NET_NF_CONNTRACK_ICMP_TIMEOUT,
	288	.procname = "nf_conntrack_icmp_timeout",
	289	.data = &nf_ct_icmp_timeout,
	290	.maxlen = sizeof(unsigned int),
	291	.mode = 0644,
	292	.proc_handler = &proc_dointvec_jiffies,
	293	},
e905a9ed	294	{
933a41e7 PM	295	.ctl_name = 0
	296	}
	297	};
a999e683 PM	298	#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	299	static struct ctl_table icmp_compat_sysctl_table[] = {
	300	{
	301	.ctl_name = NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT,
	302	.procname = "ip_conntrack_icmp_timeout",
	303	.data = &nf_ct_icmp_timeout,
	304	.maxlen = sizeof(unsigned int),
	305	.mode = 0644,
	306	.proc_handler = &proc_dointvec_jiffies,
	307	},
e905a9ed	308	{
a999e683 PM	309	.ctl_name = 0
	310	}
	311	};
	312	#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
933a41e7 PM	313	#endif /* CONFIG_SYSCTL */
933a41e7 PM	314
61075af5	315	struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp __read_mostly =
9fb9cbb1	316	{
9fb9cbb1	317	.l3proto = PF_INET,
605dcad6	318	.l4proto = IPPROTO_ICMP,
9fb9cbb1 YK	319	.name = "icmp",
	320	.pkt_to_tuple = icmp_pkt_to_tuple,
	321	.invert_tuple = icmp_invert_tuple,
	322	.print_tuple = icmp_print_tuple,
	323	.print_conntrack = icmp_print_conntrack,
	324	.packet = icmp_packet,
	325	.new = icmp_new,
	326	.error = icmp_error,
	327	.destroy = NULL,
c1d10adb	328	.me = NULL,
e281db5c	329	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
c1d10adb PNA	330	.tuple_to_nfattr = icmp_tuple_to_nfattr,
	331	.nfattr_to_tuple = icmp_nfattr_to_tuple,
	332	#endif
933a41e7 PM	333	#ifdef CONFIG_SYSCTL
	334	.ctl_table_header = &icmp_sysctl_header,
	335	.ctl_table = icmp_sysctl_table,
a999e683 PM	336	#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	337	.ctl_compat_table = icmp_compat_sysctl_table,
	338	#endif
933a41e7	339	#endif
9fb9cbb1	340	};