[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>
#include <net/netfilter/nf_log.h>

static unsigned long nf_ct_icmp_timeout __read_mostly = 30*HZ;

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

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

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

	return true;
}

/* 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 bool 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 false;

	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 true;
}

/* 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));
}

/* 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 bool icmp_new(struct nf_conn *ct, 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 (ct->tuplehash[0].tuple.dst.u.icmp.type >= sizeof(valid_new)
	    || !valid_new[ct->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",
			 ct->tuplehash[0].tuple.dst.u.icmp.type);
		nf_ct_dump_tuple_ip(&ct->tuplehash[0].tuple);
		return false;
	}
	atomic_set(&ct->proto.icmp.count, 0);
	return true;
}

/* 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;
	const struct nf_conntrack_l4proto *innerproto;
	const 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)
{
	const struct icmphdr *icmph;
	struct icmphdr _ih;

	/* 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_INET_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_nlattr(struct sk_buff *skb,
				const struct nf_conntrack_tuple *t)
{
	NLA_PUT_BE16(skb, CTA_PROTO_ICMP_ID, t->src.u.icmp.id);
	NLA_PUT_U8(skb, CTA_PROTO_ICMP_TYPE, t->dst.u.icmp.type);
	NLA_PUT_U8(skb, CTA_PROTO_ICMP_CODE, t->dst.u.icmp.code);

	return 0;

nla_put_failure:
	return -1;
}

static const struct nla_policy icmp_nla_policy[CTA_PROTO_MAX+1] = {
	[CTA_PROTO_ICMP_TYPE]	= { .type = NLA_U8 },
	[CTA_PROTO_ICMP_CODE]	= { .type = NLA_U8 },
	[CTA_PROTO_ICMP_ID]	= { .type = NLA_U16 },
};

static int icmp_nlattr_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;

	tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMP_TYPE]);
	tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMP_CODE]);
	tuple->src.u.icmp.id = nla_get_be16(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[] = {
	{
		.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[] = {
	{
		.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,
	.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_nlattr	= icmp_tuple_to_nlattr,
	.nlattr_to_tuple	= icmp_nlattr_to_tuple,
	.nla_policy		= icmp_nla_policy,
#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	20	#include <net/netfilter/nf_conntrack_core.h>
f01ffbd6	21	#include <net/netfilter/nf_log.h>
9fb9cbb1	22
933a41e7	23	static unsigned long nf_ct_icmp_timeout __read_mostly = 30*HZ;
9fb9cbb1	24
09f263cd JE	25	static bool icmp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
09f263cd JE	26	struct nf_conntrack_tuple *tuple)
9fb9cbb1	27	{
7cc3864d JE	28	const struct icmphdr *hp;
7cc3864d JE	29	struct icmphdr _hdr;
9fb9cbb1 YK	30
	31	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	32	if (hp == NULL)
09f263cd	33	return false;
9fb9cbb1 YK	34
	35	tuple->dst.u.icmp.type = hp->type;
	36	tuple->src.u.icmp.id = hp->un.echo.id;
	37	tuple->dst.u.icmp.code = hp->code;
	38
09f263cd	39	return true;
9fb9cbb1 YK	40	}
9fb9cbb1 YK	41
c1d10adb PNA	42	/* Add 1; spaces filled with 0. */
	43	static const u_int8_t invmap[] = {
	44	[ICMP_ECHO] = ICMP_ECHOREPLY + 1,
	45	[ICMP_ECHOREPLY] = ICMP_ECHO + 1,
	46	[ICMP_TIMESTAMP] = ICMP_TIMESTAMPREPLY + 1,
	47	[ICMP_TIMESTAMPREPLY] = ICMP_TIMESTAMP + 1,
	48	[ICMP_INFO_REQUEST] = ICMP_INFO_REPLY + 1,
	49	[ICMP_INFO_REPLY] = ICMP_INFO_REQUEST + 1,
	50	[ICMP_ADDRESS] = ICMP_ADDRESSREPLY + 1,
	51	[ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1
	52	};
	53
09f263cd JE	54	static bool icmp_invert_tuple(struct nf_conntrack_tuple *tuple,
09f263cd JE	55	const struct nf_conntrack_tuple *orig)
9fb9cbb1	56	{
9fb9cbb1 YK	57	if (orig->dst.u.icmp.type >= sizeof(invmap)
9fb9cbb1 YK	58	\|\| !invmap[orig->dst.u.icmp.type])
09f263cd	59	return false;
9fb9cbb1 YK	60
	61	tuple->src.u.icmp.id = orig->src.u.icmp.id;
	62	tuple->dst.u.icmp.type = invmap[orig->dst.u.icmp.type] - 1;
	63	tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
09f263cd	64	return true;
9fb9cbb1 YK	65	}
	66
	67	/* Print out the per-protocol part of the tuple. */
	68	static int icmp_print_tuple(struct seq_file *s,
	69	const struct nf_conntrack_tuple *tuple)
	70	{
	71	return seq_printf(s, "type=%u code=%u id=%u ",
	72	tuple->dst.u.icmp.type,
	73	tuple->dst.u.icmp.code,
	74	ntohs(tuple->src.u.icmp.id));
	75	}
	76
9fb9cbb1 YK	77	/* Returns verdict for packet, or -1 for invalid. */
	78	static int icmp_packet(struct nf_conn *ct,
	79	const struct sk_buff *skb,
	80	unsigned int dataoff,
	81	enum ip_conntrack_info ctinfo,
	82	int pf,
	83	unsigned int hooknum)
	84	{
	85	/* Try to delete connection immediately after all replies:
e905a9ed YH	86	won't actually vanish as we still have skb, and del_timer
	87	means this will only run once even if count hits zero twice
	88	(theoretically possible with SMP) */
9fb9cbb1 YK	89	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
	90	if (atomic_dec_and_test(&ct->proto.icmp.count)
	91	&& del_timer(&ct->timeout))
	92	ct->timeout.function((unsigned long)ct);
	93	} else {
	94	atomic_inc(&ct->proto.icmp.count);
	95	nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
	96	nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmp_timeout);
	97	}
	98
	99	return NF_ACCEPT;
	100	}
	101
	102	/* Called when a new connection for this protocol found. */
09f263cd JE	103	static bool icmp_new(struct nf_conn ct, const struct sk_buff skb,
09f263cd JE	104	unsigned int dataoff)
9fb9cbb1	105	{
c1d10adb PNA	106	static const u_int8_t valid_new[] = {
	107	[ICMP_ECHO] = 1,
	108	[ICMP_TIMESTAMP] = 1,
	109	[ICMP_INFO_REQUEST] = 1,
	110	[ICMP_ADDRESS] = 1
	111	};
9fb9cbb1	112
c88130bc PM	113	if (ct->tuplehash[0].tuple.dst.u.icmp.type >= sizeof(valid_new)
c88130bc PM	114	\|\| !valid_new[ct->tuplehash[0].tuple.dst.u.icmp.type]) {
9fb9cbb1	115	/* Can't create a new ICMP `conn' with this. */
0d53778e	116	pr_debug("icmp: can't create new conn with type %u\n",
c88130bc	117	ct->tuplehash[0].tuple.dst.u.icmp.type);
3c9fba65	118	nf_ct_dump_tuple_ip(&ct->tuplehash[0].tuple);
09f263cd	119	return false;
9fb9cbb1	120	}
c88130bc	121	atomic_set(&ct->proto.icmp.count, 0);
09f263cd	122	return true;
9fb9cbb1 YK	123	}
9fb9cbb1 YK	124
9fb9cbb1 YK	125	/* Returns conntrack if it dealt with ICMP, and filled in skb fields */
	126	static int
	127	icmp_error_message(struct sk_buff *skb,
e905a9ed YH	128	enum ip_conntrack_info *ctinfo,
e905a9ed YH	129	unsigned int hooknum)
9fb9cbb1 YK	130	{
9fb9cbb1 YK	131	struct nf_conntrack_tuple innertuple, origtuple;
7cc3864d JE	132	const struct nf_conntrack_l4proto *innerproto;
7cc3864d JE	133	const struct nf_conntrack_tuple_hash *h;
9fb9cbb1 YK	134
	135	NF_CT_ASSERT(skb->nfct == NULL);
	136
e2a3123f YK	137	/* Are they talking about one of our connections? */
	138	if (!nf_ct_get_tuplepr(skb,
	139	skb_network_offset(skb) + ip_hdrlen(skb)
	140	+ sizeof(struct icmphdr),
	141	PF_INET, &origtuple)) {
	142	pr_debug("icmp_error_message: failed to get tuple\n");
9fb9cbb1 YK	143	return -NF_ACCEPT;
	144	}
	145
923f4902	146	/* rcu_read_lock()ed by nf_hook_slow */
e2a3123f	147	innerproto = __nf_ct_l4proto_find(PF_INET, origtuple.dst.protonum);
9fb9cbb1	148
e905a9ed YH	149	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	150	been preserved inside the ICMP. */
	151	if (!nf_ct_invert_tuple(&innertuple, &origtuple,
9fb9cbb1	152	&nf_conntrack_l3proto_ipv4, innerproto)) {
0d53778e	153	pr_debug("icmp_error_message: no match\n");
9fb9cbb1 YK	154	return -NF_ACCEPT;
	155	}
	156
	157	*ctinfo = IP_CT_RELATED;
	158
330f7db5	159	h = nf_conntrack_find_get(&innertuple);
9fb9cbb1	160	if (!h) {
130e7a83 YK	161	pr_debug("icmp_error_message: no match\n");
130e7a83 YK	162	return -NF_ACCEPT;
9fb9cbb1 YK	163	}
9fb9cbb1 YK	164
130e7a83 YK	165	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
	166	*ctinfo += IP_CT_IS_REPLY;
	167
e905a9ed YH	168	/* Update skb to refer to this connection */
	169	skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
	170	skb->nfctinfo = *ctinfo;
	171	return -NF_ACCEPT;
9fb9cbb1 YK	172	}
	173
	174	/* Small and modified version of icmp_rcv */
	175	static int
	176	icmp_error(struct sk_buff *skb, unsigned int dataoff,
	177	enum ip_conntrack_info *ctinfo, int pf, unsigned int hooknum)
	178	{
7cc3864d JE	179	const struct icmphdr *icmph;
7cc3864d JE	180	struct icmphdr _ih;
9fb9cbb1 YK	181
9fb9cbb1 YK	182	/* Not enough header? */
c9bdd4b5	183	icmph = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_ih), &_ih);
9fb9cbb1 YK	184	if (icmph == NULL) {
	185	if (LOG_INVALID(IPPROTO_ICMP))
	186	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	187	"nf_ct_icmp: short packet ");
	188	return -NF_ACCEPT;
	189	}
	190
	191	/* See ip_conntrack_proto_tcp.c */
6e23ae2a	192	if (nf_conntrack_checksum && hooknum == NF_INET_PRE_ROUTING &&
96f6bf82	193	nf_ip_checksum(skb, hooknum, dataoff, 0)) {
9fb9cbb1 YK	194	if (LOG_INVALID(IPPROTO_ICMP))
	195	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	196	"nf_ct_icmp: bad HW ICMP checksum ");
	197	return -NF_ACCEPT;
9fb9cbb1 YK	198	}
9fb9cbb1 YK	199
9fb9cbb1 YK	200	/*
	201	* 18 is the highest 'known' ICMP type. Anything else is a mystery
	202	*
	203	* RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
	204	* discarded.
	205	*/
	206	if (icmph->type > NR_ICMP_TYPES) {
	207	if (LOG_INVALID(IPPROTO_ICMP))
	208	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	209	"nf_ct_icmp: invalid ICMP type ");
	210	return -NF_ACCEPT;
	211	}
	212
	213	/* Need to track icmp error message? */
	214	if (icmph->type != ICMP_DEST_UNREACH
	215	&& icmph->type != ICMP_SOURCE_QUENCH
	216	&& icmph->type != ICMP_TIME_EXCEEDED
	217	&& icmph->type != ICMP_PARAMETERPROB
	218	&& icmph->type != ICMP_REDIRECT)
	219	return NF_ACCEPT;
	220
	221	return icmp_error_message(skb, ctinfo, hooknum);
	222	}
	223
e281db5c	224	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
c1d10adb PNA	225
	226	#include <linux/netfilter/nfnetlink.h>
	227	#include <linux/netfilter/nfnetlink_conntrack.h>
	228
fdf70832	229	static int icmp_tuple_to_nlattr(struct sk_buff *skb,
c1d10adb PNA	230	const struct nf_conntrack_tuple *t)
c1d10adb PNA	231	{
77236b6e PM	232	NLA_PUT_BE16(skb, CTA_PROTO_ICMP_ID, t->src.u.icmp.id);
	233	NLA_PUT_U8(skb, CTA_PROTO_ICMP_TYPE, t->dst.u.icmp.type);
	234	NLA_PUT_U8(skb, CTA_PROTO_ICMP_CODE, t->dst.u.icmp.code);
c1d10adb PNA	235
	236	return 0;
	237
df6fb868	238	nla_put_failure:
c1d10adb PNA	239	return -1;
	240	}
	241
f73e924c PM	242	static const struct nla_policy icmp_nla_policy[CTA_PROTO_MAX+1] = {
	243	[CTA_PROTO_ICMP_TYPE] = { .type = NLA_U8 },
	244	[CTA_PROTO_ICMP_CODE] = { .type = NLA_U8 },
	245	[CTA_PROTO_ICMP_ID] = { .type = NLA_U16 },
c1d10adb PNA	246	};
c1d10adb PNA	247
fdf70832	248	static int icmp_nlattr_to_tuple(struct nlattr *tb[],
c1d10adb PNA	249	struct nf_conntrack_tuple *tuple)
c1d10adb PNA	250	{
df6fb868 PM	251	if (!tb[CTA_PROTO_ICMP_TYPE]
	252	\|\| !tb[CTA_PROTO_ICMP_CODE]
	253	\|\| !tb[CTA_PROTO_ICMP_ID])
c1d10adb PNA	254	return -EINVAL;
c1d10adb PNA	255
77236b6e PM	256	tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMP_TYPE]);
	257	tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMP_CODE]);
	258	tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMP_ID]);
c1d10adb PNA	259
	260	if (tuple->dst.u.icmp.type >= sizeof(invmap)
	261	\|\| !invmap[tuple->dst.u.icmp.type])
	262	return -EINVAL;
	263
	264	return 0;
	265	}
	266	#endif
	267
933a41e7 PM	268	#ifdef CONFIG_SYSCTL
	269	static struct ctl_table_header *icmp_sysctl_header;
	270	static struct ctl_table icmp_sysctl_table[] = {
	271	{
933a41e7 PM	272	.procname = "nf_conntrack_icmp_timeout",
	273	.data = &nf_ct_icmp_timeout,
	274	.maxlen = sizeof(unsigned int),
	275	.mode = 0644,
	276	.proc_handler = &proc_dointvec_jiffies,
	277	},
e905a9ed	278	{
933a41e7 PM	279	.ctl_name = 0
	280	}
	281	};
a999e683 PM	282	#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	283	static struct ctl_table icmp_compat_sysctl_table[] = {
	284	{
a999e683 PM	285	.procname = "ip_conntrack_icmp_timeout",
	286	.data = &nf_ct_icmp_timeout,
	287	.maxlen = sizeof(unsigned int),
	288	.mode = 0644,
	289	.proc_handler = &proc_dointvec_jiffies,
	290	},
e905a9ed	291	{
a999e683 PM	292	.ctl_name = 0
	293	}
	294	};
	295	#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
933a41e7 PM	296	#endif /* CONFIG_SYSCTL */
933a41e7 PM	297
61075af5	298	struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp __read_mostly =
9fb9cbb1	299	{
9fb9cbb1	300	.l3proto = PF_INET,
605dcad6	301	.l4proto = IPPROTO_ICMP,
9fb9cbb1 YK	302	.name = "icmp",
	303	.pkt_to_tuple = icmp_pkt_to_tuple,
	304	.invert_tuple = icmp_invert_tuple,
	305	.print_tuple = icmp_print_tuple,
9fb9cbb1 YK	306	.packet = icmp_packet,
	307	.new = icmp_new,
	308	.error = icmp_error,
	309	.destroy = NULL,
c1d10adb	310	.me = NULL,
e281db5c	311	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
fdf70832 PM	312	.tuple_to_nlattr = icmp_tuple_to_nlattr,
fdf70832 PM	313	.nlattr_to_tuple = icmp_nlattr_to_tuple,
f73e924c	314	.nla_policy = icmp_nla_policy,
c1d10adb	315	#endif
933a41e7 PM	316	#ifdef CONFIG_SYSCTL
	317	.ctl_table_header = &icmp_sysctl_header,
	318	.ctl_table = icmp_sysctl_table,
a999e683 PM	319	#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	320	.ctl_compat_table = icmp_compat_sysctl_table,
	321	#endif
933a41e7	322	#endif
9fb9cbb1	323	};