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

static unsigned int 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,
		       u_int8_t pf,
		       unsigned int hooknum)
{
	/* Do not immediately delete the connection after the first
	   successful reply to avoid excessive conntrackd traffic
	   and also to handle correctly ICMP echo reply duplicates. */
	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;
	}
	return true;
}

/* Returns conntrack if it dealt with ICMP, and filled in skb fields */
static int
icmp_error_message(struct net *net, struct nf_conn *tmpl, 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;
	u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE;

	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(net, zone, &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 net *net, struct nf_conn *tmpl,
	   struct sk_buff *skb, unsigned int dataoff,
	   enum ip_conntrack_info *ctinfo, u_int8_t 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(net, 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 (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
	    nf_ip_checksum(skb, hooknum, dataoff, 0)) {
		if (LOG_INVALID(net, 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(net, 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(net, tmpl, 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;
}

static int icmp_nlattr_tuple_size(void)
{
	return nla_policy_len(icmp_nla_policy, CTA_PROTO_MAX + 1);
}
#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,
	},
	{ }
};
#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,
	},
	{ }
};
#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_tuple_size	= icmp_nlattr_tuple_size,
	.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>
5d0aa2cc	21	#include <net/netfilter/nf_conntrack_zones.h>
f01ffbd6	22	#include <net/netfilter/nf_log.h>
9fb9cbb1	23
71320afc	24	static unsigned int nf_ct_icmp_timeout __read_mostly = 30*HZ;
9fb9cbb1	25
09f263cd JE	26	static bool icmp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
09f263cd JE	27	struct nf_conntrack_tuple *tuple)
9fb9cbb1	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)
09f263cd	34	return false;
9fb9cbb1 YK	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
09f263cd	40	return true;
9fb9cbb1 YK	41	}
9fb9cbb1 YK	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
09f263cd JE	55	static bool icmp_invert_tuple(struct nf_conntrack_tuple *tuple,
09f263cd JE	56	const struct nf_conntrack_tuple *orig)
9fb9cbb1	57	{
3666ed1c JP	58	if (orig->dst.u.icmp.type >= sizeof(invmap) \|\|
3666ed1c JP	59	!invmap[orig->dst.u.icmp.type])
09f263cd	60	return false;
9fb9cbb1 YK	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;
09f263cd	65	return true;
9fb9cbb1 YK	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,
76108cea	83	u_int8_t pf,
9fb9cbb1 YK	84	unsigned int hooknum)
9fb9cbb1 YK	85	{
f87fb666 JK	86	/* Do not immediately delete the connection after the first
	87	successful reply to avoid excessive conntrackd traffic
	88	and also to handle correctly ICMP echo reply duplicates. */
	89	nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmp_timeout);
9fb9cbb1 YK	90
	91	return NF_ACCEPT;
	92	}
	93
	94	/* Called when a new connection for this protocol found. */
09f263cd JE	95	static bool icmp_new(struct nf_conn ct, const struct sk_buff skb,
09f263cd JE	96	unsigned int dataoff)
9fb9cbb1	97	{
c1d10adb PNA	98	static const u_int8_t valid_new[] = {
	99	[ICMP_ECHO] = 1,
	100	[ICMP_TIMESTAMP] = 1,
	101	[ICMP_INFO_REQUEST] = 1,
	102	[ICMP_ADDRESS] = 1
	103	};
9fb9cbb1	104
3666ed1c JP	105	if (ct->tuplehash[0].tuple.dst.u.icmp.type >= sizeof(valid_new) \|\|
3666ed1c JP	106	!valid_new[ct->tuplehash[0].tuple.dst.u.icmp.type]) {
9fb9cbb1	107	/* Can't create a new ICMP `conn' with this. */
0d53778e	108	pr_debug("icmp: can't create new conn with type %u\n",
c88130bc	109	ct->tuplehash[0].tuple.dst.u.icmp.type);
3c9fba65	110	nf_ct_dump_tuple_ip(&ct->tuplehash[0].tuple);
09f263cd	111	return false;
9fb9cbb1	112	}
09f263cd	113	return true;
9fb9cbb1 YK	114	}
9fb9cbb1 YK	115
9fb9cbb1 YK	116	/* Returns conntrack if it dealt with ICMP, and filled in skb fields */
9fb9cbb1 YK	117	static int
5d0aa2cc	118	icmp_error_message(struct net net, struct nf_conn tmpl, struct sk_buff *skb,
e905a9ed YH	119	enum ip_conntrack_info *ctinfo,
e905a9ed YH	120	unsigned int hooknum)
9fb9cbb1 YK	121	{
9fb9cbb1 YK	122	struct nf_conntrack_tuple innertuple, origtuple;
7cc3864d JE	123	const struct nf_conntrack_l4proto *innerproto;
7cc3864d JE	124	const struct nf_conntrack_tuple_hash *h;
5d0aa2cc	125	u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE;
9fb9cbb1 YK	126
	127	NF_CT_ASSERT(skb->nfct == NULL);
	128
e2a3123f YK	129	/* Are they talking about one of our connections? */
	130	if (!nf_ct_get_tuplepr(skb,
	131	skb_network_offset(skb) + ip_hdrlen(skb)
	132	+ sizeof(struct icmphdr),
	133	PF_INET, &origtuple)) {
	134	pr_debug("icmp_error_message: failed to get tuple\n");
9fb9cbb1 YK	135	return -NF_ACCEPT;
	136	}
	137
923f4902	138	/* rcu_read_lock()ed by nf_hook_slow */
e2a3123f	139	innerproto = __nf_ct_l4proto_find(PF_INET, origtuple.dst.protonum);
9fb9cbb1	140
e905a9ed YH	141	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	142	been preserved inside the ICMP. */
	143	if (!nf_ct_invert_tuple(&innertuple, &origtuple,
9fb9cbb1	144	&nf_conntrack_l3proto_ipv4, innerproto)) {
0d53778e	145	pr_debug("icmp_error_message: no match\n");
9fb9cbb1 YK	146	return -NF_ACCEPT;
	147	}
	148
	149	*ctinfo = IP_CT_RELATED;
	150
5d0aa2cc	151	h = nf_conntrack_find_get(net, zone, &innertuple);
9fb9cbb1	152	if (!h) {
130e7a83 YK	153	pr_debug("icmp_error_message: no match\n");
130e7a83 YK	154	return -NF_ACCEPT;
9fb9cbb1 YK	155	}
9fb9cbb1 YK	156
130e7a83 YK	157	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
	158	*ctinfo += IP_CT_IS_REPLY;
	159
e905a9ed YH	160	/* Update skb to refer to this connection */
	161	skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
	162	skb->nfctinfo = *ctinfo;
	163	return -NF_ACCEPT;
9fb9cbb1 YK	164	}
	165
	166	/* Small and modified version of icmp_rcv */
	167	static int
8fea97ec PM	168	icmp_error(struct net net, struct nf_conn tmpl,
8fea97ec PM	169	struct sk_buff *skb, unsigned int dataoff,
76108cea	170	enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum)
9fb9cbb1	171	{
7cc3864d JE	172	const struct icmphdr *icmph;
7cc3864d JE	173	struct icmphdr _ih;
9fb9cbb1 YK	174
9fb9cbb1 YK	175	/* Not enough header? */
c9bdd4b5	176	icmph = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_ih), &_ih);
9fb9cbb1	177	if (icmph == NULL) {
c2a2c7e0	178	if (LOG_INVALID(net, IPPROTO_ICMP))
9fb9cbb1 YK	179	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	180	"nf_ct_icmp: short packet ");
	181	return -NF_ACCEPT;
	182	}
	183
	184	/* See ip_conntrack_proto_tcp.c */
c04d0552	185	if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
96f6bf82	186	nf_ip_checksum(skb, hooknum, dataoff, 0)) {
c2a2c7e0	187	if (LOG_INVALID(net, IPPROTO_ICMP))
9fb9cbb1 YK	188	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	189	"nf_ct_icmp: bad HW ICMP checksum ");
	190	return -NF_ACCEPT;
9fb9cbb1 YK	191	}
9fb9cbb1 YK	192
9fb9cbb1 YK	193	/*
	194	* 18 is the highest 'known' ICMP type. Anything else is a mystery
	195	*
	196	* RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
	197	* discarded.
	198	*/
	199	if (icmph->type > NR_ICMP_TYPES) {
c2a2c7e0	200	if (LOG_INVALID(net, IPPROTO_ICMP))
9fb9cbb1 YK	201	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
	202	"nf_ct_icmp: invalid ICMP type ");
	203	return -NF_ACCEPT;
	204	}
	205
	206	/* Need to track icmp error message? */
3666ed1c JP	207	if (icmph->type != ICMP_DEST_UNREACH &&
	208	icmph->type != ICMP_SOURCE_QUENCH &&
	209	icmph->type != ICMP_TIME_EXCEEDED &&
	210	icmph->type != ICMP_PARAMETERPROB &&
	211	icmph->type != ICMP_REDIRECT)
9fb9cbb1 YK	212	return NF_ACCEPT;
9fb9cbb1 YK	213
5d0aa2cc	214	return icmp_error_message(net, tmpl, skb, ctinfo, hooknum);
9fb9cbb1 YK	215	}
9fb9cbb1 YK	216
e281db5c	217	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
c1d10adb PNA	218
	219	#include <linux/netfilter/nfnetlink.h>
	220	#include <linux/netfilter/nfnetlink_conntrack.h>
	221
fdf70832	222	static int icmp_tuple_to_nlattr(struct sk_buff *skb,
c1d10adb PNA	223	const struct nf_conntrack_tuple *t)
c1d10adb PNA	224	{
77236b6e PM	225	NLA_PUT_BE16(skb, CTA_PROTO_ICMP_ID, t->src.u.icmp.id);
	226	NLA_PUT_U8(skb, CTA_PROTO_ICMP_TYPE, t->dst.u.icmp.type);
	227	NLA_PUT_U8(skb, CTA_PROTO_ICMP_CODE, t->dst.u.icmp.code);
c1d10adb PNA	228
	229	return 0;
	230
df6fb868	231	nla_put_failure:
c1d10adb PNA	232	return -1;
	233	}
	234
f73e924c PM	235	static const struct nla_policy icmp_nla_policy[CTA_PROTO_MAX+1] = {
	236	[CTA_PROTO_ICMP_TYPE] = { .type = NLA_U8 },
	237	[CTA_PROTO_ICMP_CODE] = { .type = NLA_U8 },
	238	[CTA_PROTO_ICMP_ID] = { .type = NLA_U16 },
c1d10adb PNA	239	};
c1d10adb PNA	240
fdf70832	241	static int icmp_nlattr_to_tuple(struct nlattr *tb[],
c1d10adb PNA	242	struct nf_conntrack_tuple *tuple)
c1d10adb PNA	243	{
3666ed1c JP	244	if (!tb[CTA_PROTO_ICMP_TYPE] \|\|
	245	!tb[CTA_PROTO_ICMP_CODE] \|\|
	246	!tb[CTA_PROTO_ICMP_ID])
c1d10adb PNA	247	return -EINVAL;
c1d10adb PNA	248
77236b6e PM	249	tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMP_TYPE]);
	250	tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMP_CODE]);
	251	tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMP_ID]);
c1d10adb	252
3666ed1c JP	253	if (tuple->dst.u.icmp.type >= sizeof(invmap) \|\|
3666ed1c JP	254	!invmap[tuple->dst.u.icmp.type])
c1d10adb PNA	255	return -EINVAL;
	256
	257	return 0;
	258	}
a400c30e HE	259
	260	static int icmp_nlattr_tuple_size(void)
	261	{
	262	return nla_policy_len(icmp_nla_policy, CTA_PROTO_MAX + 1);
	263	}
c1d10adb PNA	264	#endif
c1d10adb PNA	265
933a41e7 PM	266	#ifdef CONFIG_SYSCTL
	267	static struct ctl_table_header *icmp_sysctl_header;
	268	static struct ctl_table icmp_sysctl_table[] = {
	269	{
933a41e7 PM	270	.procname = "nf_conntrack_icmp_timeout",
	271	.data = &nf_ct_icmp_timeout,
	272	.maxlen = sizeof(unsigned int),
	273	.mode = 0644,
6d9f239a	274	.proc_handler = proc_dointvec_jiffies,
933a41e7	275	},
f8572d8f	276	{ }
933a41e7	277	};
a999e683 PM	278	#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	279	static struct ctl_table icmp_compat_sysctl_table[] = {
	280	{
a999e683 PM	281	.procname = "ip_conntrack_icmp_timeout",
	282	.data = &nf_ct_icmp_timeout,
	283	.maxlen = sizeof(unsigned int),
	284	.mode = 0644,
6d9f239a	285	.proc_handler = proc_dointvec_jiffies,
a999e683	286	},
f8572d8f	287	{ }
a999e683 PM	288	};
a999e683 PM	289	#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
933a41e7 PM	290	#endif /* CONFIG_SYSCTL */
933a41e7 PM	291
61075af5	292	struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp __read_mostly =
9fb9cbb1	293	{
9fb9cbb1	294	.l3proto = PF_INET,
605dcad6	295	.l4proto = IPPROTO_ICMP,
9fb9cbb1 YK	296	.name = "icmp",
	297	.pkt_to_tuple = icmp_pkt_to_tuple,
	298	.invert_tuple = icmp_invert_tuple,
	299	.print_tuple = icmp_print_tuple,
9fb9cbb1 YK	300	.packet = icmp_packet,
	301	.new = icmp_new,
	302	.error = icmp_error,
	303	.destroy = NULL,
c1d10adb	304	.me = NULL,
e281db5c	305	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
fdf70832	306	.tuple_to_nlattr = icmp_tuple_to_nlattr,
a400c30e	307	.nlattr_tuple_size = icmp_nlattr_tuple_size,
fdf70832	308	.nlattr_to_tuple = icmp_nlattr_to_tuple,
f73e924c	309	.nla_policy = icmp_nla_policy,
c1d10adb	310	#endif
933a41e7 PM	311	#ifdef CONFIG_SYSCTL
	312	.ctl_table_header = &icmp_sysctl_header,
	313	.ctl_table = icmp_sysctl_table,
a999e683 PM	314	#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	315	.ctl_compat_table = icmp_compat_sysctl_table,
	316	#endif
933a41e7	317	#endif
9fb9cbb1	318	};