[mirror_ubuntu-disco-kernel.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;
}

/* 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_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(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 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 =
			*(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[] = {
	{
		.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,
	.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_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 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
9fb9cbb1 YK	131	/* Returns conntrack if it dealt with ICMP, and filled in skb fields */
	132	static int
	133	icmp_error_message(struct sk_buff *skb,
e905a9ed YH	134	enum ip_conntrack_info *ctinfo,
e905a9ed YH	135	unsigned int hooknum)
9fb9cbb1 YK	136	{
9fb9cbb1 YK	137	struct nf_conntrack_tuple innertuple, origtuple;
605dcad6	138	struct nf_conntrack_l4proto *innerproto;
9fb9cbb1	139	struct nf_conntrack_tuple_hash *h;
9fb9cbb1 YK	140
	141	NF_CT_ASSERT(skb->nfct == NULL);
	142
e2a3123f YK	143	/* Are they talking about one of our connections? */
	144	if (!nf_ct_get_tuplepr(skb,
	145	skb_network_offset(skb) + ip_hdrlen(skb)
	146	+ sizeof(struct icmphdr),
	147	PF_INET, &origtuple)) {
	148	pr_debug("icmp_error_message: failed to get tuple\n");
9fb9cbb1 YK	149	return -NF_ACCEPT;
	150	}
	151
923f4902	152	/* rcu_read_lock()ed by nf_hook_slow */
e2a3123f	153	innerproto = __nf_ct_l4proto_find(PF_INET, origtuple.dst.protonum);
9fb9cbb1	154
e905a9ed YH	155	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	156	been preserved inside the ICMP. */
	157	if (!nf_ct_invert_tuple(&innertuple, &origtuple,
9fb9cbb1	158	&nf_conntrack_l3proto_ipv4, innerproto)) {
0d53778e	159	pr_debug("icmp_error_message: no match\n");
9fb9cbb1 YK	160	return -NF_ACCEPT;
	161	}
	162
	163	*ctinfo = IP_CT_RELATED;
	164
330f7db5	165	h = nf_conntrack_find_get(&innertuple);
9fb9cbb1	166	if (!h) {
130e7a83 YK	167	pr_debug("icmp_error_message: no match\n");
130e7a83 YK	168	return -NF_ACCEPT;
9fb9cbb1 YK	169	}
9fb9cbb1 YK	170
130e7a83 YK	171	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
	172	*ctinfo += IP_CT_IS_REPLY;
	173
e905a9ed YH	174	/* Update skb to refer to this connection */
	175	skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
	176	skb->nfctinfo = *ctinfo;
	177	return -NF_ACCEPT;
9fb9cbb1 YK	178	}
	179
	180	/* Small and modified version of icmp_rcv */
	181	static int
	182	icmp_error(struct sk_buff *skb, unsigned int dataoff,
	183	enum ip_conntrack_info *ctinfo, int pf, unsigned int hooknum)
	184	{
	185	struct icmphdr _ih, *icmph;
	186
	187	/* Not enough header? */
c9bdd4b5	188	icmph = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_ih), &_ih);
9fb9cbb1 YK	189	if (icmph == NULL) {
	190	if (LOG_INVALID(IPPROTO_ICMP))
	191	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	192	"nf_ct_icmp: short packet ");
	193	return -NF_ACCEPT;
	194	}
	195
	196	/* See ip_conntrack_proto_tcp.c */
6e23ae2a	197	if (nf_conntrack_checksum && hooknum == NF_INET_PRE_ROUTING &&
96f6bf82	198	nf_ip_checksum(skb, hooknum, dataoff, 0)) {
9fb9cbb1 YK	199	if (LOG_INVALID(IPPROTO_ICMP))
	200	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	201	"nf_ct_icmp: bad HW ICMP checksum ");
	202	return -NF_ACCEPT;
9fb9cbb1 YK	203	}
9fb9cbb1 YK	204
9fb9cbb1 YK	205	/*
	206	* 18 is the highest 'known' ICMP type. Anything else is a mystery
	207	*
	208	* RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
	209	* discarded.
	210	*/
	211	if (icmph->type > NR_ICMP_TYPES) {
	212	if (LOG_INVALID(IPPROTO_ICMP))
	213	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	214	"nf_ct_icmp: invalid ICMP type ");
	215	return -NF_ACCEPT;
	216	}
	217
	218	/* Need to track icmp error message? */
	219	if (icmph->type != ICMP_DEST_UNREACH
	220	&& icmph->type != ICMP_SOURCE_QUENCH
	221	&& icmph->type != ICMP_TIME_EXCEEDED
	222	&& icmph->type != ICMP_PARAMETERPROB
	223	&& icmph->type != ICMP_REDIRECT)
	224	return NF_ACCEPT;
	225
	226	return icmp_error_message(skb, ctinfo, hooknum);
	227	}
	228
e281db5c	229	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
c1d10adb PNA	230
	231	#include <linux/netfilter/nfnetlink.h>
	232	#include <linux/netfilter/nfnetlink_conntrack.h>
	233
fdf70832	234	static int icmp_tuple_to_nlattr(struct sk_buff *skb,
c1d10adb PNA	235	const struct nf_conntrack_tuple *t)
c1d10adb PNA	236	{
df6fb868	237	NLA_PUT(skb, CTA_PROTO_ICMP_ID, sizeof(u_int16_t),
c1d10adb	238	&t->src.u.icmp.id);
df6fb868	239	NLA_PUT(skb, CTA_PROTO_ICMP_TYPE, sizeof(u_int8_t),
c1d10adb	240	&t->dst.u.icmp.type);
df6fb868	241	NLA_PUT(skb, CTA_PROTO_ICMP_CODE, sizeof(u_int8_t),
c1d10adb PNA	242	&t->dst.u.icmp.code);
	243
	244	return 0;
	245
df6fb868	246	nla_put_failure:
c1d10adb PNA	247	return -1;
	248	}
	249
f73e924c PM	250	static const struct nla_policy icmp_nla_policy[CTA_PROTO_MAX+1] = {
	251	[CTA_PROTO_ICMP_TYPE] = { .type = NLA_U8 },
	252	[CTA_PROTO_ICMP_CODE] = { .type = NLA_U8 },
	253	[CTA_PROTO_ICMP_ID] = { .type = NLA_U16 },
c1d10adb PNA	254	};
c1d10adb PNA	255
fdf70832	256	static int icmp_nlattr_to_tuple(struct nlattr *tb[],
c1d10adb PNA	257	struct nf_conntrack_tuple *tuple)
c1d10adb PNA	258	{
df6fb868 PM	259	if (!tb[CTA_PROTO_ICMP_TYPE]
	260	\|\| !tb[CTA_PROTO_ICMP_CODE]
	261	\|\| !tb[CTA_PROTO_ICMP_ID])
c1d10adb PNA	262	return -EINVAL;
c1d10adb PNA	263
e905a9ed	264	tuple->dst.u.icmp.type =
df6fb868	265	(u_int8_t )nla_data(tb[CTA_PROTO_ICMP_TYPE]);
c1d10adb	266	tuple->dst.u.icmp.code =
df6fb868	267	(u_int8_t )nla_data(tb[CTA_PROTO_ICMP_CODE]);
c1d10adb	268	tuple->src.u.icmp.id =
df6fb868	269	(__be16 )nla_data(tb[CTA_PROTO_ICMP_ID]);
c1d10adb PNA	270
	271	if (tuple->dst.u.icmp.type >= sizeof(invmap)
	272	\|\| !invmap[tuple->dst.u.icmp.type])
	273	return -EINVAL;
	274
	275	return 0;
	276	}
	277	#endif
	278
933a41e7 PM	279	#ifdef CONFIG_SYSCTL
	280	static struct ctl_table_header *icmp_sysctl_header;
	281	static struct ctl_table icmp_sysctl_table[] = {
	282	{
933a41e7 PM	283	.procname = "nf_conntrack_icmp_timeout",
	284	.data = &nf_ct_icmp_timeout,
	285	.maxlen = sizeof(unsigned int),
	286	.mode = 0644,
	287	.proc_handler = &proc_dointvec_jiffies,
	288	},
e905a9ed	289	{
933a41e7 PM	290	.ctl_name = 0
	291	}
	292	};
a999e683 PM	293	#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	294	static struct ctl_table icmp_compat_sysctl_table[] = {
	295	{
a999e683 PM	296	.procname = "ip_conntrack_icmp_timeout",
	297	.data = &nf_ct_icmp_timeout,
	298	.maxlen = sizeof(unsigned int),
	299	.mode = 0644,
	300	.proc_handler = &proc_dointvec_jiffies,
	301	},
e905a9ed	302	{
a999e683 PM	303	.ctl_name = 0
	304	}
	305	};
	306	#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
933a41e7 PM	307	#endif /* CONFIG_SYSCTL */
933a41e7 PM	308
61075af5	309	struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp __read_mostly =
9fb9cbb1	310	{
9fb9cbb1	311	.l3proto = PF_INET,
605dcad6	312	.l4proto = IPPROTO_ICMP,
9fb9cbb1 YK	313	.name = "icmp",
	314	.pkt_to_tuple = icmp_pkt_to_tuple,
	315	.invert_tuple = icmp_invert_tuple,
	316	.print_tuple = icmp_print_tuple,
	317	.print_conntrack = icmp_print_conntrack,
	318	.packet = icmp_packet,
	319	.new = icmp_new,
	320	.error = icmp_error,
	321	.destroy = NULL,
c1d10adb	322	.me = NULL,
e281db5c	323	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
fdf70832 PM	324	.tuple_to_nlattr = icmp_tuple_to_nlattr,
fdf70832 PM	325	.nlattr_to_tuple = icmp_nlattr_to_tuple,
f73e924c	326	.nla_policy = icmp_nla_policy,
c1d10adb	327	#endif
933a41e7 PM	328	#ifdef CONFIG_SYSCTL
	329	.ctl_table_header = &icmp_sysctl_header,
	330	.ctl_table = icmp_sysctl_table,
a999e683 PM	331	#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	332	.ctl_compat_table = icmp_compat_sysctl_table,
	333	#endif
933a41e7	334	#endif
9fb9cbb1	335	};