[deliverable/linux.git] / net / ipv4 / netfilter / ip_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/sched.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.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv4/ip_conntrack.h>
#include <linux/netfilter_ipv4/ip_conntrack_core.h>
#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>

unsigned long ip_ct_icmp_timeout = 30*HZ;

#if 0
#define DEBUGP printk
#else
#define DEBUGP(format, args...)
#endif

static int icmp_pkt_to_tuple(const struct sk_buff *skb,
			     unsigned int dataoff,
			     struct ip_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;
}

static int icmp_invert_tuple(struct ip_conntrack_tuple *tuple,
			     const struct ip_conntrack_tuple *orig)
{
	/* Add 1; spaces filled with 0. */
	static 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};

	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 ip_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 ip_conntrack *conntrack)
{
	return 0;
}

/* Returns verdict for packet, or -1 for invalid. */
static int icmp_packet(struct ip_conntrack *ct,
		       const struct sk_buff *skb,
		       enum ip_conntrack_info ctinfo)
{
	/* 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);
		ip_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
		ip_ct_refresh_acct(ct, ctinfo, skb, ip_ct_icmp_timeout);
	}

	return NF_ACCEPT;
}

static u_int8_t valid_new[] = { 
	[ICMP_ECHO] = 1,
	[ICMP_TIMESTAMP] = 1,
	[ICMP_INFO_REQUEST] = 1,
	[ICMP_ADDRESS] = 1 
};

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

static int
icmp_error_message(struct sk_buff *skb,
		   enum ip_conntrack_info *ctinfo,
		   unsigned int hooknum)
{
	struct ip_conntrack_tuple innertuple, origtuple;
	struct {
		struct icmphdr icmp;
		struct iphdr ip;
	} _in, *inside;
	struct ip_conntrack_protocol *innerproto;
	struct ip_conntrack_tuple_hash *h;
	int dataoff;

	IP_NF_ASSERT(skb->nfct == NULL);

	/* Not enough header? */
	inside = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_in), &_in);
	if (inside == NULL)
		return NF_ACCEPT;

	/* Ignore ICMP's containing fragments (shouldn't happen) */
	if (inside->ip.frag_off & htons(IP_OFFSET)) {
		DEBUGP("icmp_error_track: fragment of proto %u\n",
		       inside->ip.protocol);
		return NF_ACCEPT;
	}

	innerproto = ip_conntrack_proto_find_get(inside->ip.protocol);
	dataoff = skb->nh.iph->ihl*4 + sizeof(inside->icmp) + inside->ip.ihl*4;
	/* Are they talking about one of our connections? */
	if (!ip_ct_get_tuple(&inside->ip, skb, dataoff, &origtuple, innerproto)) {
		DEBUGP("icmp_error: ! get_tuple p=%u", inside->ip.protocol);
		ip_conntrack_proto_put(innerproto);
		return NF_ACCEPT;
	}

	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	   been preserved inside the ICMP. */
	if (!ip_ct_invert_tuple(&innertuple, &origtuple, innerproto)) {
		DEBUGP("icmp_error_track: Can't invert tuple\n");
		ip_conntrack_proto_put(innerproto);
		return NF_ACCEPT;
	}
	ip_conntrack_proto_put(innerproto);

	*ctinfo = IP_CT_RELATED;

	h = ip_conntrack_find_get(&innertuple, NULL);
	if (!h) {
		/* Locally generated ICMPs will match inverted if they
		   haven't been SNAT'ed yet */
		/* FIXME: NAT code has to handle half-done double NAT --RR */
		if (hooknum == NF_IP_LOCAL_OUT)
			h = ip_conntrack_find_get(&origtuple, NULL);

		if (!h) {
			DEBUGP("icmp_error_track: no match\n");
			return NF_ACCEPT;
		}
		/* Reverse direction from that found */
		if (DIRECTION(h) != IP_CT_DIR_REPLY)
			*ctinfo += IP_CT_IS_REPLY;
	} else {
		if (DIRECTION(h) == IP_CT_DIR_REPLY)
			*ctinfo += IP_CT_IS_REPLY;
	}

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

	/* Not enough header? */
	icmph = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_ih), &_ih);
	if (icmph == NULL) {
		if (LOG_INVALID(IPPROTO_ICMP))
			nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
				      "ip_ct_icmp: short packet ");
		return -NF_ACCEPT;
	}

	/* See ip_conntrack_proto_tcp.c */
	if (hooknum != NF_IP_PRE_ROUTING)
		goto checksum_skipped;

	switch (skb->ip_summed) {
	case CHECKSUM_HW:
		if (!(u16)csum_fold(skb->csum)) 
			break;
		if (LOG_INVALID(IPPROTO_ICMP))
			nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
				      "ip_ct_icmp: bad HW ICMP checksum ");
		return -NF_ACCEPT;
	case CHECKSUM_NONE:
		if ((u16)csum_fold(skb_checksum(skb, 0, skb->len, 0))) {
			if (LOG_INVALID(IPPROTO_ICMP))
				nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
					      "ip_ct_icmp: bad ICMP checksum ");
			return -NF_ACCEPT;
		}
	default:
		break;
	}

checksum_skipped:
	/*
	 *	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,
				      "ip_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_IP_NF_CONNTRACK_NETLINK) || \
    defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
static int icmp_tuple_to_nfattr(struct sk_buff *skb,
				const struct ip_conntrack_tuple *t)
{
	NFA_PUT(skb, CTA_PROTO_ICMP_ID, sizeof(u_int16_t),
		&t->src.u.icmp.id);
	NFA_PUT(skb, CTA_PROTO_ICMP_TYPE, sizeof(u_int8_t),
		&t->dst.u.icmp.type);
	NFA_PUT(skb, CTA_PROTO_ICMP_CODE, sizeof(u_int8_t),
		&t->dst.u.icmp.code);

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

	return 0;

nfattr_failure:
	return -1;
}

static int icmp_nfattr_to_tuple(struct nfattr *tb[],
				struct ip_conntrack_tuple *tuple)
{
	if (!tb[CTA_PROTO_ICMP_TYPE-1]
	    || !tb[CTA_PROTO_ICMP_CODE-1]
	    || !tb[CTA_PROTO_ICMP_ID-1])
		return -1;

	tuple->dst.u.icmp.type = 
			*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMP_TYPE-1]);
	tuple->dst.u.icmp.code =
			*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMP_CODE-1]);
	tuple->src.u.icmp.id =
			*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMP_ID-1]);

	return 0;
}
#endif

struct ip_conntrack_protocol ip_conntrack_protocol_icmp =
{
	.proto 			= 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,
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
    defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
	.tuple_to_nfattr	= icmp_tuple_to_nfattr,
	.nfattr_to_tuple	= icmp_nfattr_to_tuple,
#endif
};
Commit	Line	Data
1da177e4 LT	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.
	7	*/
	8
	9	#include <linux/types.h>
	10	#include <linux/sched.h>
	11	#include <linux/timer.h>
	12	#include <linux/netfilter.h>
	13	#include <linux/in.h>
	14	#include <linux/icmp.h>
	15	#include <linux/seq_file.h>
	16	#include <net/ip.h>
	17	#include <net/checksum.h>
	18	#include <linux/netfilter.h>
	19	#include <linux/netfilter_ipv4.h>
	20	#include <linux/netfilter_ipv4/ip_conntrack.h>
	21	#include <linux/netfilter_ipv4/ip_conntrack_core.h>
	22	#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
	23
	24	unsigned long ip_ct_icmp_timeout = 30*HZ;
	25
	26	#if 0
	27	#define DEBUGP printk
	28	#else
	29	#define DEBUGP(format, args...)
	30	#endif
	31
	32	static int icmp_pkt_to_tuple(const struct sk_buff *skb,
	33	unsigned int dataoff,
	34	struct ip_conntrack_tuple *tuple)
	35	{
	36	struct icmphdr _hdr, *hp;
	37
	38	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	39	if (hp == NULL)
	40	return 0;
	41
	42	tuple->dst.u.icmp.type = hp->type;
	43	tuple->src.u.icmp.id = hp->un.echo.id;
	44	tuple->dst.u.icmp.code = hp->code;
	45
	46	return 1;
	47	}
	48
	49	static int icmp_invert_tuple(struct ip_conntrack_tuple *tuple,
	50	const struct ip_conntrack_tuple *orig)
	51	{
	52	/* Add 1; spaces filled with 0. */
	53	static u_int8_t invmap[]
	54	= { [ICMP_ECHO] = ICMP_ECHOREPLY + 1,
	55	[ICMP_ECHOREPLY] = ICMP_ECHO + 1,
	56	[ICMP_TIMESTAMP] = ICMP_TIMESTAMPREPLY + 1,
	57	[ICMP_TIMESTAMPREPLY] = ICMP_TIMESTAMP + 1,
	58	[ICMP_INFO_REQUEST] = ICMP_INFO_REPLY + 1,
	59	[ICMP_INFO_REPLY] = ICMP_INFO_REQUEST + 1,
	60	[ICMP_ADDRESS] = ICMP_ADDRESSREPLY + 1,
	61	[ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1};
	62
	63	if (orig->dst.u.icmp.type >= sizeof(invmap)
	64	\|\| !invmap[orig->dst.u.icmp.type])
65	return 0;
66
67	tuple->src.u.icmp.id = orig->src.u.icmp.id;
68	tuple->dst.u.icmp.type = invmap[orig->dst.u.icmp.type] - 1;
69	tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
70	return 1;
71	}
72
73	/* Print out the per-protocol part of the tuple. */
74	static int icmp_print_tuple(struct seq_file *s,
75	const struct ip_conntrack_tuple *tuple)
76	{
77	return seq_printf(s, "type=%u code=%u id=%u ",
78	tuple->dst.u.icmp.type,
79	tuple->dst.u.icmp.code,
80	ntohs(tuple->src.u.icmp.id));
81	}
82
83	/* Print out the private part of the conntrack. */
84	static int icmp_print_conntrack(struct seq_file *s,
85	const struct ip_conntrack *conntrack)
86	{
87	return 0;
88	}
89
90	/* Returns verdict for packet, or -1 for invalid. */
91	static int icmp_packet(struct ip_conntrack *ct,
92	const struct sk_buff *skb,
93	enum ip_conntrack_info ctinfo)
94	{
95	/* Try to delete connection immediately after all replies:
96	won't actually vanish as we still have skb, and del_timer
97	means this will only run once even if count hits zero twice
98	(theoretically possible with SMP) */
99	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
100	if (atomic_dec_and_test(&ct->proto.icmp.count)
101	&& del_timer(&ct->timeout))
102	ct->timeout.function((unsigned long)ct);
103	} else {
104	atomic_inc(&ct->proto.icmp.count);
ac3247ba	105	ip_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
1da177e4 LT	106	ip_ct_refresh_acct(ct, ctinfo, skb, ip_ct_icmp_timeout);
	107	}
	108
	109	return NF_ACCEPT;
	110	}
	111
080774a2 HW	112	static u_int8_t valid_new[] = {
	113	[ICMP_ECHO] = 1,
	114	[ICMP_TIMESTAMP] = 1,
	115	[ICMP_INFO_REQUEST] = 1,
	116	[ICMP_ADDRESS] = 1
	117	};
	118
1da177e4 LT	119	/* Called when a new connection for this protocol found. */
	120	static int icmp_new(struct ip_conntrack *conntrack,
	121	const struct sk_buff *skb)
	122	{
1da177e4 LT	123	if (conntrack->tuplehash[0].tuple.dst.u.icmp.type >= sizeof(valid_new)
	124	\|\| !valid_new[conntrack->tuplehash[0].tuple.dst.u.icmp.type]) {
	125	/* Can't create a new ICMP `conn' with this. */
	126	DEBUGP("icmp: can't create new conn with type %u\n",
	127	conntrack->tuplehash[0].tuple.dst.u.icmp.type);
	128	DUMP_TUPLE(&conntrack->tuplehash[0].tuple);
	129	return 0;
	130	}
	131	atomic_set(&conntrack->proto.icmp.count, 0);
	132	return 1;
	133	}
	134
	135	static int
	136	icmp_error_message(struct sk_buff *skb,
	137	enum ip_conntrack_info *ctinfo,
	138	unsigned int hooknum)
	139	{
	140	struct ip_conntrack_tuple innertuple, origtuple;
	141	struct {
	142	struct icmphdr icmp;
	143	struct iphdr ip;
	144	} _in, *inside;
	145	struct ip_conntrack_protocol *innerproto;
	146	struct ip_conntrack_tuple_hash *h;
	147	int dataoff;
	148
	149	IP_NF_ASSERT(skb->nfct == NULL);
	150
	151	/* Not enough header? */
	152	inside = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_in), &_in);
	153	if (inside == NULL)
	154	return NF_ACCEPT;
	155
	156	/* Ignore ICMP's containing fragments (shouldn't happen) */
	157	if (inside->ip.frag_off & htons(IP_OFFSET)) {
	158	DEBUGP("icmp_error_track: fragment of proto %u\n",
	159	inside->ip.protocol);
	160	return NF_ACCEPT;
	161	}
	162
080774a2	163	innerproto = ip_conntrack_proto_find_get(inside->ip.protocol);
1da177e4 LT	164	dataoff = skb->nh.iph->ihl4 + sizeof(inside->icmp) + inside->ip.ihl4;
	165	/* Are they talking about one of our connections? */
	166	if (!ip_ct_get_tuple(&inside->ip, skb, dataoff, &origtuple, innerproto)) {
	167	DEBUGP("icmp_error: ! get_tuple p=%u", inside->ip.protocol);
080774a2	168	ip_conntrack_proto_put(innerproto);
1da177e4 LT	169	return NF_ACCEPT;
	170	}
	171
	172	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	173	been preserved inside the ICMP. */
	174	if (!ip_ct_invert_tuple(&innertuple, &origtuple, innerproto)) {
	175	DEBUGP("icmp_error_track: Can't invert tuple\n");
080774a2	176	ip_conntrack_proto_put(innerproto);
1da177e4 LT	177	return NF_ACCEPT;
1da177e4 LT	178	}
080774a2	179	ip_conntrack_proto_put(innerproto);
1da177e4 LT	180
	181	*ctinfo = IP_CT_RELATED;
	182
	183	h = ip_conntrack_find_get(&innertuple, NULL);
	184	if (!h) {
	185	/* Locally generated ICMPs will match inverted if they
	186	haven't been SNAT'ed yet */
	187	/* FIXME: NAT code has to handle half-done double NAT --RR */
	188	if (hooknum == NF_IP_LOCAL_OUT)
	189	h = ip_conntrack_find_get(&origtuple, NULL);
	190
	191	if (!h) {
	192	DEBUGP("icmp_error_track: no match\n");
	193	return NF_ACCEPT;
	194	}
	195	/* Reverse direction from that found */
	196	if (DIRECTION(h) != IP_CT_DIR_REPLY)
	197	*ctinfo += IP_CT_IS_REPLY;
	198	} else {
	199	if (DIRECTION(h) == IP_CT_DIR_REPLY)
	200	*ctinfo += IP_CT_IS_REPLY;
	201	}
	202
	203	/* Update skb to refer to this connection */
	204	skb->nfct = &tuplehash_to_ctrack(h)->ct_general;
	205	skb->nfctinfo = *ctinfo;
	206	return -NF_ACCEPT;
	207	}
	208
	209	/* Small and modified version of icmp_rcv */
	210	static int
	211	icmp_error(struct sk_buff skb, enum ip_conntrack_info ctinfo,
	212	unsigned int hooknum)
	213	{
	214	struct icmphdr _ih, *icmph;
	215
	216	/* Not enough header? */
	217	icmph = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_ih), &_ih);
	218	if (icmph == NULL) {
	219	if (LOG_INVALID(IPPROTO_ICMP))
608c8e4f	220	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
1da177e4 LT	221	"ip_ct_icmp: short packet ");
	222	return -NF_ACCEPT;
	223	}
	224
	225	/* See ip_conntrack_proto_tcp.c */
	226	if (hooknum != NF_IP_PRE_ROUTING)
	227	goto checksum_skipped;
	228
	229	switch (skb->ip_summed) {
	230	case CHECKSUM_HW:
	231	if (!(u16)csum_fold(skb->csum))
	232	break;
	233	if (LOG_INVALID(IPPROTO_ICMP))
608c8e4f	234	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
1da177e4 LT	235	"ip_ct_icmp: bad HW ICMP checksum ");
	236	return -NF_ACCEPT;
	237	case CHECKSUM_NONE:
	238	if ((u16)csum_fold(skb_checksum(skb, 0, skb->len, 0))) {
	239	if (LOG_INVALID(IPPROTO_ICMP))
608c8e4f	240	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
1da177e4 LT	241	"ip_ct_icmp: bad ICMP checksum ");
	242	return -NF_ACCEPT;
	243	}
	244	default:
	245	break;
	246	}
	247
	248	checksum_skipped:
	249	/*
	250	* 18 is the highest 'known' ICMP type. Anything else is a mystery
	251	*
	252	* RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
	253	* discarded.
	254	*/
	255	if (icmph->type > NR_ICMP_TYPES) {
	256	if (LOG_INVALID(IPPROTO_ICMP))
608c8e4f	257	nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
1da177e4 LT	258	"ip_ct_icmp: invalid ICMP type ");
	259	return -NF_ACCEPT;
	260	}
	261
	262	/* Need to track icmp error message? */
	263	if (icmph->type != ICMP_DEST_UNREACH
	264	&& icmph->type != ICMP_SOURCE_QUENCH
	265	&& icmph->type != ICMP_TIME_EXCEEDED
	266	&& icmph->type != ICMP_PARAMETERPROB
	267	&& icmph->type != ICMP_REDIRECT)
	268	return NF_ACCEPT;
	269
	270	return icmp_error_message(skb, ctinfo, hooknum);
	271	}
	272
080774a2 HW	273	#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) \|\| \
	274	defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
	275	static int icmp_tuple_to_nfattr(struct sk_buff *skb,
	276	const struct ip_conntrack_tuple *t)
	277	{
	278	NFA_PUT(skb, CTA_PROTO_ICMP_ID, sizeof(u_int16_t),
	279	&t->src.u.icmp.id);
	280	NFA_PUT(skb, CTA_PROTO_ICMP_TYPE, sizeof(u_int8_t),
	281	&t->dst.u.icmp.type);
	282	NFA_PUT(skb, CTA_PROTO_ICMP_CODE, sizeof(u_int8_t),
	283	&t->dst.u.icmp.code);
	284
	285	if (t->dst.u.icmp.type >= sizeof(valid_new)
	286	\|\| !valid_new[t->dst.u.icmp.type])
	287	return -EINVAL;
	288
	289	return 0;
	290
	291	nfattr_failure:
	292	return -1;
	293	}
	294
	295	static int icmp_nfattr_to_tuple(struct nfattr *tb[],
	296	struct ip_conntrack_tuple *tuple)
	297	{
	298	if (!tb[CTA_PROTO_ICMP_TYPE-1]
	299	\|\| !tb[CTA_PROTO_ICMP_CODE-1]
	300	\|\| !tb[CTA_PROTO_ICMP_ID-1])
	301	return -1;
	302
	303	tuple->dst.u.icmp.type =
	304	(u_int8_t )NFA_DATA(tb[CTA_PROTO_ICMP_TYPE-1]);
	305	tuple->dst.u.icmp.code =
	306	(u_int8_t )NFA_DATA(tb[CTA_PROTO_ICMP_CODE-1]);
	307	tuple->src.u.icmp.id =
	308	(u_int8_t )NFA_DATA(tb[CTA_PROTO_ICMP_ID-1]);
	309
	310	return 0;
	311	}
	312	#endif
	313
1da177e4 LT	314	struct ip_conntrack_protocol ip_conntrack_protocol_icmp =
	315	{
	316	.proto = IPPROTO_ICMP,
	317	.name = "icmp",
	318	.pkt_to_tuple = icmp_pkt_to_tuple,
	319	.invert_tuple = icmp_invert_tuple,
	320	.print_tuple = icmp_print_tuple,
	321	.print_conntrack = icmp_print_conntrack,
	322	.packet = icmp_packet,
	323	.new = icmp_new,
	324	.error = icmp_error,
080774a2 HW	325	#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) \|\| \
	326	defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
	327	.tuple_to_nfattr = icmp_tuple_to_nfattr,
	328	.nfattr_to_tuple = icmp_nfattr_to_tuple,
	329	#endif
1da177e4	330	};