[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 int 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 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));
}

/* 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 *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(&ct->tuplehash[0].tuple);
		return 0;
	}
	atomic_set(&ct->proto.icmp.count, 0);
	return 1;
}

/* 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
9fb9cbb1 YK	25	static int icmp_pkt_to_tuple(const struct sk_buff *skb,
	26	unsigned int dataoff,
	27	struct nf_conntrack_tuple *tuple)
	28	{
7cc3864d JE	29	const struct icmphdr *hp;
7cc3864d JE	30	struct icmphdr _hdr;
9fb9cbb1 YK	31
	32	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	33	if (hp == NULL)
	34	return 0;
	35
	36	tuple->dst.u.icmp.type = hp->type;
	37	tuple->src.u.icmp.id = hp->un.echo.id;
	38	tuple->dst.u.icmp.code = hp->code;
	39
	40	return 1;
	41	}
	42
c1d10adb PNA	43	/* Add 1; spaces filled with 0. */
	44	static const u_int8_t invmap[] = {
	45	[ICMP_ECHO] = ICMP_ECHOREPLY + 1,
	46	[ICMP_ECHOREPLY] = ICMP_ECHO + 1,
	47	[ICMP_TIMESTAMP] = ICMP_TIMESTAMPREPLY + 1,
	48	[ICMP_TIMESTAMPREPLY] = ICMP_TIMESTAMP + 1,
	49	[ICMP_INFO_REQUEST] = ICMP_INFO_REPLY + 1,
	50	[ICMP_INFO_REPLY] = ICMP_INFO_REQUEST + 1,
	51	[ICMP_ADDRESS] = ICMP_ADDRESSREPLY + 1,
	52	[ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1
	53	};
	54
9fb9cbb1 YK	55	static int icmp_invert_tuple(struct nf_conntrack_tuple *tuple,
	56	const struct nf_conntrack_tuple *orig)
	57	{
9fb9cbb1 YK	58	if (orig->dst.u.icmp.type >= sizeof(invmap)
	59	\|\| !invmap[orig->dst.u.icmp.type])
	60	return 0;
	61
	62	tuple->src.u.icmp.id = orig->src.u.icmp.id;
	63	tuple->dst.u.icmp.type = invmap[orig->dst.u.icmp.type] - 1;
	64	tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
	65	return 1;
	66	}
	67
	68	/* Print out the per-protocol part of the tuple. */
	69	static int icmp_print_tuple(struct seq_file *s,
	70	const struct nf_conntrack_tuple *tuple)
	71	{
	72	return seq_printf(s, "type=%u code=%u id=%u ",
	73	tuple->dst.u.icmp.type,
	74	tuple->dst.u.icmp.code,
	75	ntohs(tuple->src.u.icmp.id));
	76	}
	77
9fb9cbb1 YK	78	/* Returns verdict for packet, or -1 for invalid. */
	79	static int icmp_packet(struct nf_conn *ct,
	80	const struct sk_buff *skb,
	81	unsigned int dataoff,
	82	enum ip_conntrack_info ctinfo,
	83	int pf,
	84	unsigned int hooknum)
	85	{
	86	/* Try to delete connection immediately after all replies:
e905a9ed YH	87	won't actually vanish as we still have skb, and del_timer
	88	means this will only run once even if count hits zero twice
	89	(theoretically possible with SMP) */
9fb9cbb1 YK	90	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
	91	if (atomic_dec_and_test(&ct->proto.icmp.count)
	92	&& del_timer(&ct->timeout))
	93	ct->timeout.function((unsigned long)ct);
	94	} else {
	95	atomic_inc(&ct->proto.icmp.count);
	96	nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
	97	nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmp_timeout);
	98	}
	99
	100	return NF_ACCEPT;
	101	}
	102
	103	/* Called when a new connection for this protocol found. */
c88130bc	104	static int icmp_new(struct nf_conn *ct,
9fb9cbb1 YK	105	const struct sk_buff *skb, unsigned int dataoff)
9fb9cbb1 YK	106	{
c1d10adb PNA	107	static const u_int8_t valid_new[] = {
	108	[ICMP_ECHO] = 1,
	109	[ICMP_TIMESTAMP] = 1,
	110	[ICMP_INFO_REQUEST] = 1,
	111	[ICMP_ADDRESS] = 1
	112	};
9fb9cbb1	113
c88130bc PM	114	if (ct->tuplehash[0].tuple.dst.u.icmp.type >= sizeof(valid_new)
c88130bc PM	115	\|\| !valid_new[ct->tuplehash[0].tuple.dst.u.icmp.type]) {
9fb9cbb1	116	/* Can't create a new ICMP `conn' with this. */
0d53778e	117	pr_debug("icmp: can't create new conn with type %u\n",
c88130bc PM	118	ct->tuplehash[0].tuple.dst.u.icmp.type);
c88130bc PM	119	NF_CT_DUMP_TUPLE(&ct->tuplehash[0].tuple);
9fb9cbb1 YK	120	return 0;
9fb9cbb1 YK	121	}
c88130bc	122	atomic_set(&ct->proto.icmp.count, 0);
9fb9cbb1 YK	123	return 1;
	124	}
	125
9fb9cbb1 YK	126	/* Returns conntrack if it dealt with ICMP, and filled in skb fields */
	127	static int
	128	icmp_error_message(struct sk_buff *skb,
e905a9ed YH	129	enum ip_conntrack_info *ctinfo,
e905a9ed YH	130	unsigned int hooknum)
9fb9cbb1 YK	131	{
9fb9cbb1 YK	132	struct nf_conntrack_tuple innertuple, origtuple;
7cc3864d JE	133	const struct nf_conntrack_l4proto *innerproto;
7cc3864d JE	134	const struct nf_conntrack_tuple_hash *h;
9fb9cbb1 YK	135
	136	NF_CT_ASSERT(skb->nfct == NULL);
	137
e2a3123f YK	138	/* Are they talking about one of our connections? */
	139	if (!nf_ct_get_tuplepr(skb,
	140	skb_network_offset(skb) + ip_hdrlen(skb)
	141	+ sizeof(struct icmphdr),
	142	PF_INET, &origtuple)) {
	143	pr_debug("icmp_error_message: failed to get tuple\n");
9fb9cbb1 YK	144	return -NF_ACCEPT;
	145	}
	146
923f4902	147	/* rcu_read_lock()ed by nf_hook_slow */
e2a3123f	148	innerproto = __nf_ct_l4proto_find(PF_INET, origtuple.dst.protonum);
9fb9cbb1	149
e905a9ed YH	150	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	151	been preserved inside the ICMP. */
	152	if (!nf_ct_invert_tuple(&innertuple, &origtuple,
9fb9cbb1	153	&nf_conntrack_l3proto_ipv4, innerproto)) {
0d53778e	154	pr_debug("icmp_error_message: no match\n");
9fb9cbb1 YK	155	return -NF_ACCEPT;
	156	}
	157
	158	*ctinfo = IP_CT_RELATED;
	159
330f7db5	160	h = nf_conntrack_find_get(&innertuple);
9fb9cbb1	161	if (!h) {
130e7a83 YK	162	pr_debug("icmp_error_message: no match\n");
130e7a83 YK	163	return -NF_ACCEPT;
9fb9cbb1 YK	164	}
9fb9cbb1 YK	165
130e7a83 YK	166	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
	167	*ctinfo += IP_CT_IS_REPLY;
	168
e905a9ed YH	169	/* Update skb to refer to this connection */
	170	skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
	171	skb->nfctinfo = *ctinfo;
	172	return -NF_ACCEPT;
9fb9cbb1 YK	173	}
	174
	175	/* Small and modified version of icmp_rcv */
	176	static int
	177	icmp_error(struct sk_buff *skb, unsigned int dataoff,
	178	enum ip_conntrack_info *ctinfo, int pf, unsigned int hooknum)
	179	{
7cc3864d JE	180	const struct icmphdr *icmph;
7cc3864d JE	181	struct icmphdr _ih;
9fb9cbb1 YK	182
9fb9cbb1 YK	183	/* Not enough header? */
c9bdd4b5	184	icmph = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_ih), &_ih);
9fb9cbb1 YK	185	if (icmph == NULL) {
	186	if (LOG_INVALID(IPPROTO_ICMP))
	187	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	188	"nf_ct_icmp: short packet ");
	189	return -NF_ACCEPT;
	190	}
	191
	192	/* See ip_conntrack_proto_tcp.c */
6e23ae2a	193	if (nf_conntrack_checksum && hooknum == NF_INET_PRE_ROUTING &&
96f6bf82	194	nf_ip_checksum(skb, hooknum, dataoff, 0)) {
9fb9cbb1 YK	195	if (LOG_INVALID(IPPROTO_ICMP))
	196	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	197	"nf_ct_icmp: bad HW ICMP checksum ");
	198	return -NF_ACCEPT;
9fb9cbb1 YK	199	}
9fb9cbb1 YK	200
9fb9cbb1 YK	201	/*
	202	* 18 is the highest 'known' ICMP type. Anything else is a mystery
	203	*
	204	* RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
	205	* discarded.
	206	*/
	207	if (icmph->type > NR_ICMP_TYPES) {
	208	if (LOG_INVALID(IPPROTO_ICMP))
	209	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	210	"nf_ct_icmp: invalid ICMP type ");
	211	return -NF_ACCEPT;
	212	}
	213
	214	/* Need to track icmp error message? */
	215	if (icmph->type != ICMP_DEST_UNREACH
	216	&& icmph->type != ICMP_SOURCE_QUENCH
	217	&& icmph->type != ICMP_TIME_EXCEEDED
	218	&& icmph->type != ICMP_PARAMETERPROB
	219	&& icmph->type != ICMP_REDIRECT)
	220	return NF_ACCEPT;
	221
	222	return icmp_error_message(skb, ctinfo, hooknum);
	223	}
	224
e281db5c	225	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
c1d10adb PNA	226
	227	#include <linux/netfilter/nfnetlink.h>
	228	#include <linux/netfilter/nfnetlink_conntrack.h>
	229
fdf70832	230	static int icmp_tuple_to_nlattr(struct sk_buff *skb,
c1d10adb PNA	231	const struct nf_conntrack_tuple *t)
c1d10adb PNA	232	{
77236b6e PM	233	NLA_PUT_BE16(skb, CTA_PROTO_ICMP_ID, t->src.u.icmp.id);
	234	NLA_PUT_U8(skb, CTA_PROTO_ICMP_TYPE, t->dst.u.icmp.type);
	235	NLA_PUT_U8(skb, CTA_PROTO_ICMP_CODE, t->dst.u.icmp.code);
c1d10adb PNA	236
	237	return 0;
	238
df6fb868	239	nla_put_failure:
c1d10adb PNA	240	return -1;
	241	}
	242
f73e924c PM	243	static const struct nla_policy icmp_nla_policy[CTA_PROTO_MAX+1] = {
	244	[CTA_PROTO_ICMP_TYPE] = { .type = NLA_U8 },
	245	[CTA_PROTO_ICMP_CODE] = { .type = NLA_U8 },
	246	[CTA_PROTO_ICMP_ID] = { .type = NLA_U16 },
c1d10adb PNA	247	};
c1d10adb PNA	248
fdf70832	249	static int icmp_nlattr_to_tuple(struct nlattr *tb[],
c1d10adb PNA	250	struct nf_conntrack_tuple *tuple)
c1d10adb PNA	251	{
df6fb868 PM	252	if (!tb[CTA_PROTO_ICMP_TYPE]
	253	\|\| !tb[CTA_PROTO_ICMP_CODE]
	254	\|\| !tb[CTA_PROTO_ICMP_ID])
c1d10adb PNA	255	return -EINVAL;
c1d10adb PNA	256
77236b6e PM	257	tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMP_TYPE]);
	258	tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMP_CODE]);
	259	tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMP_ID]);
c1d10adb PNA	260
	261	if (tuple->dst.u.icmp.type >= sizeof(invmap)
	262	\|\| !invmap[tuple->dst.u.icmp.type])
	263	return -EINVAL;
	264
	265	return 0;
	266	}
	267	#endif
	268
933a41e7 PM	269	#ifdef CONFIG_SYSCTL
	270	static struct ctl_table_header *icmp_sysctl_header;
	271	static struct ctl_table icmp_sysctl_table[] = {
	272	{
933a41e7 PM	273	.procname = "nf_conntrack_icmp_timeout",
	274	.data = &nf_ct_icmp_timeout,
	275	.maxlen = sizeof(unsigned int),
	276	.mode = 0644,
	277	.proc_handler = &proc_dointvec_jiffies,
	278	},
e905a9ed	279	{
933a41e7 PM	280	.ctl_name = 0
	281	}
	282	};
a999e683 PM	283	#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	284	static struct ctl_table icmp_compat_sysctl_table[] = {
	285	{
a999e683 PM	286	.procname = "ip_conntrack_icmp_timeout",
	287	.data = &nf_ct_icmp_timeout,
	288	.maxlen = sizeof(unsigned int),
	289	.mode = 0644,
	290	.proc_handler = &proc_dointvec_jiffies,
	291	},
e905a9ed	292	{
a999e683 PM	293	.ctl_name = 0
	294	}
	295	};
	296	#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
933a41e7 PM	297	#endif /* CONFIG_SYSCTL */
933a41e7 PM	298
61075af5	299	struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp __read_mostly =
9fb9cbb1	300	{
9fb9cbb1	301	.l3proto = PF_INET,
605dcad6	302	.l4proto = IPPROTO_ICMP,
9fb9cbb1 YK	303	.name = "icmp",
	304	.pkt_to_tuple = icmp_pkt_to_tuple,
	305	.invert_tuple = icmp_invert_tuple,
	306	.print_tuple = icmp_print_tuple,
9fb9cbb1 YK	307	.packet = icmp_packet,
	308	.new = icmp_new,
	309	.error = icmp_error,
	310	.destroy = NULL,
c1d10adb	311	.me = NULL,
e281db5c	312	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
fdf70832 PM	313	.tuple_to_nlattr = icmp_tuple_to_nlattr,
fdf70832 PM	314	.nlattr_to_tuple = icmp_nlattr_to_tuple,
f73e924c	315	.nla_policy = icmp_nla_policy,
c1d10adb	316	#endif
933a41e7 PM	317	#ifdef CONFIG_SYSCTL
	318	.ctl_table_header = &icmp_sysctl_header,
	319	.ctl_table = icmp_sysctl_table,
a999e683 PM	320	#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	321	.ctl_compat_table = icmp_compat_sysctl_table,
	322	#endif
933a41e7	323	#endif
9fb9cbb1	324	};