[deliverable/linux.git] / net / ipv6 / netfilter / nf_conntrack_proto_icmpv6.c

/*
 * Copyright (C)2003,2004 USAGI/WIDE Project
 *
 * 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.
 *
 * Author:
 *	Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
 */

#include <linux/types.h>
#include <linux/timer.h>
#include <linux/module.h>
#include <linux/netfilter.h>
#include <linux/in6.h>
#include <linux/icmpv6.h>
#include <linux/ipv6.h>
#include <net/ipv6.h>
#include <net/ip6_checksum.h>
#include <linux/seq_file.h>
#include <linux/netfilter_ipv6.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/ipv6/nf_conntrack_icmpv6.h>

static unsigned long nf_ct_icmpv6_timeout __read_mostly = 30*HZ;

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

static int icmpv6_pkt_to_tuple(const struct sk_buff *skb,
			       unsigned int dataoff,
			       struct nf_conntrack_tuple *tuple)
{
	struct icmp6hdr _hdr, *hp;

	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	if (hp == NULL)
		return 0;
	tuple->dst.u.icmp.type = hp->icmp6_type;
	tuple->src.u.icmp.id = hp->icmp6_identifier;
	tuple->dst.u.icmp.code = hp->icmp6_code;

	return 1;
}

/* Add 1; spaces filled with 0. */
static u_int8_t invmap[] = {
	[ICMPV6_ECHO_REQUEST - 128]	= ICMPV6_ECHO_REPLY + 1,
	[ICMPV6_ECHO_REPLY - 128]	= ICMPV6_ECHO_REQUEST + 1,
	[ICMPV6_NI_QUERY - 128]		= ICMPV6_NI_QUERY + 1,
	[ICMPV6_NI_REPLY - 128]		= ICMPV6_NI_REPLY +1
};

static int icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
			       const struct nf_conntrack_tuple *orig)
{
	int type = orig->dst.u.icmp.type - 128;
	if (type < 0 || type >= sizeof(invmap) || !invmap[type])
		return 0;

	tuple->src.u.icmp.id   = orig->src.u.icmp.id;
	tuple->dst.u.icmp.type = invmap[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 icmpv6_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 icmpv6_print_conntrack(struct seq_file *s,
				  const struct nf_conn *conntrack)
{
	return 0;
}

/* Returns verdict for packet, or -1 for invalid. */
static int icmpv6_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_icmpv6_timeout);
	}

	return NF_ACCEPT;
}

/* Called when a new connection for this protocol found. */
static int icmpv6_new(struct nf_conn *conntrack,
		      const struct sk_buff *skb,
		      unsigned int dataoff)
{
	static u_int8_t valid_new[] = {
		[ICMPV6_ECHO_REQUEST - 128] = 1,
		[ICMPV6_NI_QUERY - 128] = 1
	};
	int type = conntrack->tuplehash[0].tuple.dst.u.icmp.type - 128;

	if (type < 0 || type >= sizeof(valid_new) || !valid_new[type]) {
		/* Can't create a new ICMPv6 `conn' with this. */
		DEBUGP("icmpv6: can't create new conn with type %u\n",
		       type + 128);
		NF_CT_DUMP_TUPLE(&conntrack->tuplehash[0].tuple);
		return 0;
	}
	atomic_set(&conntrack->proto.icmp.count, 0);
	return 1;
}

static int
icmpv6_error_message(struct sk_buff *skb,
		     unsigned int icmp6off,
		     enum ip_conntrack_info *ctinfo,
		     unsigned int hooknum)
{
	struct nf_conntrack_tuple intuple, origtuple;
	struct nf_conntrack_tuple_hash *h;
	struct icmp6hdr _hdr, *hp;
	unsigned int inip6off;
	struct nf_conntrack_l4proto *inproto;
	u_int8_t inprotonum;
	unsigned int inprotoff;

	NF_CT_ASSERT(skb->nfct == NULL);

	hp = skb_header_pointer(skb, icmp6off, sizeof(_hdr), &_hdr);
	if (hp == NULL) {
		DEBUGP("icmpv6_error: Can't get ICMPv6 hdr.\n");
		return -NF_ACCEPT;
	}

	inip6off = icmp6off + sizeof(_hdr);
	if (skb_copy_bits(skb, inip6off+offsetof(struct ipv6hdr, nexthdr),
			  &inprotonum, sizeof(inprotonum)) != 0) {
		DEBUGP("icmpv6_error: Can't get nexthdr in inner IPv6 header.\n");
		return -NF_ACCEPT;
	}
	inprotoff = nf_ct_ipv6_skip_exthdr(skb,
					   inip6off + sizeof(struct ipv6hdr),
					   &inprotonum,
					   skb->len - inip6off
						    - sizeof(struct ipv6hdr));

	if ((inprotoff > skb->len) || (inprotonum == NEXTHDR_FRAGMENT)) {
		DEBUGP("icmpv6_error: Can't get protocol header in ICMPv6 payload.\n");
		return -NF_ACCEPT;
	}

	/* rcu_read_lock()ed by nf_hook_slow */
	inproto = __nf_ct_l4proto_find(PF_INET6, inprotonum);

	/* Are they talking about one of our connections? */
	if (!nf_ct_get_tuple(skb, inip6off, inprotoff, PF_INET6, inprotonum,
			     &origtuple, &nf_conntrack_l3proto_ipv6, inproto)) {
		DEBUGP("icmpv6_error: Can't get tuple\n");
		return -NF_ACCEPT;
	}

	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	   been preserved inside the ICMP. */
	if (!nf_ct_invert_tuple(&intuple, &origtuple,
				&nf_conntrack_l3proto_ipv6, inproto)) {
		DEBUGP("icmpv6_error: Can't invert tuple\n");
		return -NF_ACCEPT;
	}

	*ctinfo = IP_CT_RELATED;

	h = nf_conntrack_find_get(&intuple, NULL);
	if (!h) {
		DEBUGP("icmpv6_error: no match\n");
		return -NF_ACCEPT;
	} else {
		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;
}

static int
icmpv6_error(struct sk_buff *skb, unsigned int dataoff,
	     enum ip_conntrack_info *ctinfo, int pf, unsigned int hooknum)
{
	struct icmp6hdr _ih, *icmp6h;

	icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
	if (icmp6h == NULL) {
		if (LOG_INVALID(IPPROTO_ICMPV6))
		nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
			      "nf_ct_icmpv6: short packet ");
		return -NF_ACCEPT;
	}

	if (nf_conntrack_checksum && hooknum == NF_IP6_PRE_ROUTING &&
	    nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
		nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
			      "nf_ct_icmpv6: ICMPv6 checksum failed\n");
		return -NF_ACCEPT;
	}

	/* is not error message ? */
	if (icmp6h->icmp6_type >= 128)
		return NF_ACCEPT;

	return icmpv6_error_message(skb, dataoff, 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 icmpv6_tuple_to_nfattr(struct sk_buff *skb,
				  const struct nf_conntrack_tuple *t)
{
	NFA_PUT(skb, CTA_PROTO_ICMPV6_ID, sizeof(u_int16_t),
		&t->src.u.icmp.id);
	NFA_PUT(skb, CTA_PROTO_ICMPV6_TYPE, sizeof(u_int8_t),
		&t->dst.u.icmp.type);
	NFA_PUT(skb, CTA_PROTO_ICMPV6_CODE, sizeof(u_int8_t),
		&t->dst.u.icmp.code);

	return 0;

nfattr_failure:
	return -1;
}

static const size_t cta_min_proto[CTA_PROTO_MAX] = {
	[CTA_PROTO_ICMPV6_TYPE-1] = sizeof(u_int8_t),
	[CTA_PROTO_ICMPV6_CODE-1] = sizeof(u_int8_t),
	[CTA_PROTO_ICMPV6_ID-1]   = sizeof(u_int16_t)
};

static int icmpv6_nfattr_to_tuple(struct nfattr *tb[],
				struct nf_conntrack_tuple *tuple)
{
	if (!tb[CTA_PROTO_ICMPV6_TYPE-1]
	    || !tb[CTA_PROTO_ICMPV6_CODE-1]
	    || !tb[CTA_PROTO_ICMPV6_ID-1])
		return -EINVAL;

	if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
		return -EINVAL;

	tuple->dst.u.icmp.type =
			*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMPV6_TYPE-1]);
	tuple->dst.u.icmp.code =
			*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMPV6_CODE-1]);
	tuple->src.u.icmp.id =
			*(__be16 *)NFA_DATA(tb[CTA_PROTO_ICMPV6_ID-1]);

	if (tuple->dst.u.icmp.type < 128
	    || tuple->dst.u.icmp.type - 128 >= sizeof(invmap)
	    || !invmap[tuple->dst.u.icmp.type - 128])
		return -EINVAL;

	return 0;
}
#endif

#ifdef CONFIG_SYSCTL
static struct ctl_table_header *icmpv6_sysctl_header;
static struct ctl_table icmpv6_sysctl_table[] = {
	{
		.ctl_name	= NET_NF_CONNTRACK_ICMPV6_TIMEOUT,
		.procname	= "nf_conntrack_icmpv6_timeout",
		.data		= &nf_ct_icmpv6_timeout,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.ctl_name	= 0
	}
};
#endif /* CONFIG_SYSCTL */

struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 =
{
	.l3proto		= PF_INET6,
	.l4proto		= IPPROTO_ICMPV6,
	.name			= "icmpv6",
	.pkt_to_tuple		= icmpv6_pkt_to_tuple,
	.invert_tuple		= icmpv6_invert_tuple,
	.print_tuple		= icmpv6_print_tuple,
	.print_conntrack	= icmpv6_print_conntrack,
	.packet			= icmpv6_packet,
	.new			= icmpv6_new,
	.error			= icmpv6_error,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
	.tuple_to_nfattr	= icmpv6_tuple_to_nfattr,
	.nfattr_to_tuple	= icmpv6_nfattr_to_tuple,
#endif
#ifdef CONFIG_SYSCTL
	.ctl_table_header	= &icmpv6_sysctl_header,
	.ctl_table		= icmpv6_sysctl_table,
#endif
};

EXPORT_SYMBOL(nf_conntrack_l4proto_icmpv6);
Commit	Line	Data
9fb9cbb1 YK	1	/*
	2	* Copyright (C)2003,2004 USAGI/WIDE Project
	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	* Author:
	9	* Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
9fb9cbb1 YK	10	*/
	11
	12	#include <linux/types.h>
9fb9cbb1 YK	13	#include <linux/timer.h>
	14	#include <linux/module.h>
	15	#include <linux/netfilter.h>
	16	#include <linux/in6.h>
	17	#include <linux/icmpv6.h>
	18	#include <linux/ipv6.h>
	19	#include <net/ipv6.h>
	20	#include <net/ip6_checksum.h>
	21	#include <linux/seq_file.h>
	22	#include <linux/netfilter_ipv6.h>
	23	#include <net/netfilter/nf_conntrack_tuple.h>
605dcad6	24	#include <net/netfilter/nf_conntrack_l4proto.h>
9fb9cbb1 YK	25	#include <net/netfilter/nf_conntrack_core.h>
	26	#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
	27
933a41e7	28	static unsigned long nf_ct_icmpv6_timeout __read_mostly = 30*HZ;
9fb9cbb1 YK	29
	30	#if 0
	31	#define DEBUGP printk
	32	#else
	33	#define DEBUGP(format, args...)
	34	#endif
	35
	36	static int icmpv6_pkt_to_tuple(const struct sk_buff *skb,
	37	unsigned int dataoff,
	38	struct nf_conntrack_tuple *tuple)
	39	{
	40	struct icmp6hdr _hdr, *hp;
	41
	42	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	43	if (hp == NULL)
	44	return 0;
	45	tuple->dst.u.icmp.type = hp->icmp6_type;
	46	tuple->src.u.icmp.id = hp->icmp6_identifier;
	47	tuple->dst.u.icmp.code = hp->icmp6_code;
	48
	49	return 1;
	50	}
	51
c1d10adb PNA	52	/* Add 1; spaces filled with 0. */
	53	static u_int8_t invmap[] = {
	54	[ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1,
	55	[ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1,
	56	[ICMPV6_NI_QUERY - 128] = ICMPV6_NI_QUERY + 1,
	57	[ICMPV6_NI_REPLY - 128] = ICMPV6_NI_REPLY +1
	58	};
	59
9fb9cbb1 YK	60	static int icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
	61	const struct nf_conntrack_tuple *orig)
	62	{
f16c9107 YK	63	int type = orig->dst.u.icmp.type - 128;
f16c9107 YK	64	if (type < 0 \|\| type >= sizeof(invmap) \|\| !invmap[type])
9fb9cbb1 YK	65	return 0;
	66
	67	tuple->src.u.icmp.id = orig->src.u.icmp.id;
	68	tuple->dst.u.icmp.type = invmap[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 icmpv6_print_tuple(struct seq_file *s,
	75	const struct nf_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 icmpv6_print_conntrack(struct seq_file *s,
	85	const struct nf_conn *conntrack)
	86	{
	87	return 0;
	88	}
	89
	90	/* Returns verdict for packet, or -1 for invalid. */
	91	static int icmpv6_packet(struct nf_conn *ct,
	92	const struct sk_buff *skb,
	93	unsigned int dataoff,
	94	enum ip_conntrack_info ctinfo,
	95	int pf,
	96	unsigned int hooknum)
	97	{
	98	/* Try to delete connection immediately after all replies:
1ab1457c YH	99	won't actually vanish as we still have skb, and del_timer
	100	means this will only run once even if count hits zero twice
	101	(theoretically possible with SMP) */
9fb9cbb1 YK	102	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
	103	if (atomic_dec_and_test(&ct->proto.icmp.count)
	104	&& del_timer(&ct->timeout))
	105	ct->timeout.function((unsigned long)ct);
	106	} else {
	107	atomic_inc(&ct->proto.icmp.count);
	108	nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
	109	nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmpv6_timeout);
	110	}
	111
	112	return NF_ACCEPT;
	113	}
	114
	115	/* Called when a new connection for this protocol found. */
	116	static int icmpv6_new(struct nf_conn *conntrack,
	117	const struct sk_buff *skb,
	118	unsigned int dataoff)
	119	{
	120	static u_int8_t valid_new[] = {
	121	[ICMPV6_ECHO_REQUEST - 128] = 1,
	122	[ICMPV6_NI_QUERY - 128] = 1
	123	};
f16c9107	124	int type = conntrack->tuplehash[0].tuple.dst.u.icmp.type - 128;
9fb9cbb1	125
f16c9107	126	if (type < 0 \|\| type >= sizeof(valid_new) \|\| !valid_new[type]) {
9fb9cbb1	127	/* Can't create a new ICMPv6 `conn' with this. */
f16c9107 YK	128	DEBUGP("icmpv6: can't create new conn with type %u\n",
f16c9107 YK	129	type + 128);
9fb9cbb1 YK	130	NF_CT_DUMP_TUPLE(&conntrack->tuplehash[0].tuple);
	131	return 0;
	132	}
	133	atomic_set(&conntrack->proto.icmp.count, 0);
	134	return 1;
	135	}
	136
9fb9cbb1 YK	137	static int
	138	icmpv6_error_message(struct sk_buff *skb,
	139	unsigned int icmp6off,
	140	enum ip_conntrack_info *ctinfo,
	141	unsigned int hooknum)
	142	{
	143	struct nf_conntrack_tuple intuple, origtuple;
	144	struct nf_conntrack_tuple_hash *h;
	145	struct icmp6hdr _hdr, *hp;
	146	unsigned int inip6off;
605dcad6	147	struct nf_conntrack_l4proto *inproto;
9fb9cbb1 YK	148	u_int8_t inprotonum;
	149	unsigned int inprotoff;
	150
	151	NF_CT_ASSERT(skb->nfct == NULL);
	152
	153	hp = skb_header_pointer(skb, icmp6off, sizeof(_hdr), &_hdr);
	154	if (hp == NULL) {
	155	DEBUGP("icmpv6_error: Can't get ICMPv6 hdr.\n");
	156	return -NF_ACCEPT;
	157	}
	158
	159	inip6off = icmp6off + sizeof(_hdr);
	160	if (skb_copy_bits(skb, inip6off+offsetof(struct ipv6hdr, nexthdr),
	161	&inprotonum, sizeof(inprotonum)) != 0) {
	162	DEBUGP("icmpv6_error: Can't get nexthdr in inner IPv6 header.\n");
	163	return -NF_ACCEPT;
	164	}
	165	inprotoff = nf_ct_ipv6_skip_exthdr(skb,
	166	inip6off + sizeof(struct ipv6hdr),
	167	&inprotonum,
	168	skb->len - inip6off
	169	- sizeof(struct ipv6hdr));
	170
75202e76	171	if ((inprotoff > skb->len) \|\| (inprotonum == NEXTHDR_FRAGMENT)) {
9fb9cbb1 YK	172	DEBUGP("icmpv6_error: Can't get protocol header in ICMPv6 payload.\n");
	173	return -NF_ACCEPT;
	174	}
	175
923f4902	176	/* rcu_read_lock()ed by nf_hook_slow */
605dcad6	177	inproto = __nf_ct_l4proto_find(PF_INET6, inprotonum);
9fb9cbb1 YK	178
	179	/* Are they talking about one of our connections? */
	180	if (!nf_ct_get_tuple(skb, inip6off, inprotoff, PF_INET6, inprotonum,
	181	&origtuple, &nf_conntrack_l3proto_ipv6, inproto)) {
	182	DEBUGP("icmpv6_error: Can't get tuple\n");
	183	return -NF_ACCEPT;
	184	}
	185
	186	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	187	been preserved inside the ICMP. */
	188	if (!nf_ct_invert_tuple(&intuple, &origtuple,
	189	&nf_conntrack_l3proto_ipv6, inproto)) {
	190	DEBUGP("icmpv6_error: Can't invert tuple\n");
	191	return -NF_ACCEPT;
	192	}
	193
	194	*ctinfo = IP_CT_RELATED;
	195
	196	h = nf_conntrack_find_get(&intuple, NULL);
	197	if (!h) {
	198	DEBUGP("icmpv6_error: no match\n");
	199	return -NF_ACCEPT;
	200	} else {
	201	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
	202	*ctinfo += IP_CT_IS_REPLY;
	203	}
	204
	205	/* Update skb to refer to this connection */
	206	skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
	207	skb->nfctinfo = *ctinfo;
	208	return -NF_ACCEPT;
	209	}
	210
	211	static int
	212	icmpv6_error(struct sk_buff *skb, unsigned int dataoff,
	213	enum ip_conntrack_info *ctinfo, int pf, unsigned int hooknum)
	214	{
	215	struct icmp6hdr _ih, *icmp6h;
	216
	217	icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
	218	if (icmp6h == NULL) {
	219	if (LOG_INVALID(IPPROTO_ICMPV6))
	220	nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
	221	"nf_ct_icmpv6: short packet ");
	222	return -NF_ACCEPT;
	223	}
	224
39a27a35	225	if (nf_conntrack_checksum && hooknum == NF_IP6_PRE_ROUTING &&
96f6bf82	226	nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
9fb9cbb1 YK	227	nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
	228	"nf_ct_icmpv6: ICMPv6 checksum failed\n");
	229	return -NF_ACCEPT;
	230	}
	231
9fb9cbb1 YK	232	/* is not error message ? */
	233	if (icmp6h->icmp6_type >= 128)
	234	return NF_ACCEPT;
	235
	236	return icmpv6_error_message(skb, dataoff, ctinfo, hooknum);
	237	}
	238
e281db5c	239	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
c1d10adb PNA	240
	241	#include <linux/netfilter/nfnetlink.h>
	242	#include <linux/netfilter/nfnetlink_conntrack.h>
	243	static int icmpv6_tuple_to_nfattr(struct sk_buff *skb,
	244	const struct nf_conntrack_tuple *t)
	245	{
	246	NFA_PUT(skb, CTA_PROTO_ICMPV6_ID, sizeof(u_int16_t),
	247	&t->src.u.icmp.id);
	248	NFA_PUT(skb, CTA_PROTO_ICMPV6_TYPE, sizeof(u_int8_t),
	249	&t->dst.u.icmp.type);
	250	NFA_PUT(skb, CTA_PROTO_ICMPV6_CODE, sizeof(u_int8_t),
	251	&t->dst.u.icmp.code);
	252
	253	return 0;
	254
	255	nfattr_failure:
	256	return -1;
	257	}
	258
	259	static const size_t cta_min_proto[CTA_PROTO_MAX] = {
	260	[CTA_PROTO_ICMPV6_TYPE-1] = sizeof(u_int8_t),
	261	[CTA_PROTO_ICMPV6_CODE-1] = sizeof(u_int8_t),
	262	[CTA_PROTO_ICMPV6_ID-1] = sizeof(u_int16_t)
	263	};
	264
	265	static int icmpv6_nfattr_to_tuple(struct nfattr *tb[],
	266	struct nf_conntrack_tuple *tuple)
	267	{
	268	if (!tb[CTA_PROTO_ICMPV6_TYPE-1]
	269	\|\| !tb[CTA_PROTO_ICMPV6_CODE-1]
	270	\|\| !tb[CTA_PROTO_ICMPV6_ID-1])
	271	return -EINVAL;
	272
	273	if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
	274	return -EINVAL;
	275
	276	tuple->dst.u.icmp.type =
	277	(u_int8_t )NFA_DATA(tb[CTA_PROTO_ICMPV6_TYPE-1]);
	278	tuple->dst.u.icmp.code =
	279	(u_int8_t )NFA_DATA(tb[CTA_PROTO_ICMPV6_CODE-1]);
	280	tuple->src.u.icmp.id =
bff9a89b	281	(__be16 )NFA_DATA(tb[CTA_PROTO_ICMPV6_ID-1]);
c1d10adb PNA	282
	283	if (tuple->dst.u.icmp.type < 128
	284	\|\| tuple->dst.u.icmp.type - 128 >= sizeof(invmap)
	285	\|\| !invmap[tuple->dst.u.icmp.type - 128])
	286	return -EINVAL;
	287
	288	return 0;
	289	}
	290	#endif
	291
933a41e7 PM	292	#ifdef CONFIG_SYSCTL
	293	static struct ctl_table_header *icmpv6_sysctl_header;
	294	static struct ctl_table icmpv6_sysctl_table[] = {
	295	{
	296	.ctl_name = NET_NF_CONNTRACK_ICMPV6_TIMEOUT,
	297	.procname = "nf_conntrack_icmpv6_timeout",
	298	.data = &nf_ct_icmpv6_timeout,
	299	.maxlen = sizeof(unsigned int),
	300	.mode = 0644,
	301	.proc_handler = &proc_dointvec_jiffies,
	302	},
	303	{
	304	.ctl_name = 0
	305	}
	306	};
	307	#endif /* CONFIG_SYSCTL */
	308
605dcad6	309	struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 =
9fb9cbb1 YK	310	{
9fb9cbb1 YK	311	.l3proto = PF_INET6,
605dcad6	312	.l4proto = IPPROTO_ICMPV6,
9fb9cbb1 YK	313	.name = "icmpv6",
	314	.pkt_to_tuple = icmpv6_pkt_to_tuple,
	315	.invert_tuple = icmpv6_invert_tuple,
	316	.print_tuple = icmpv6_print_tuple,
	317	.print_conntrack = icmpv6_print_conntrack,
	318	.packet = icmpv6_packet,
	319	.new = icmpv6_new,
	320	.error = icmpv6_error,
e281db5c	321	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
c1d10adb PNA	322	.tuple_to_nfattr = icmpv6_tuple_to_nfattr,
	323	.nfattr_to_tuple = icmpv6_nfattr_to_tuple,
	324	#endif
933a41e7 PM	325	#ifdef CONFIG_SYSCTL
	326	.ctl_table_header = &icmpv6_sysctl_header,
	327	.ctl_table = icmpv6_sysctl_table,
	328	#endif
9fb9cbb1 YK	329	};
9fb9cbb1 YK	330
605dcad6	331	EXPORT_SYMBOL(nf_conntrack_l4proto_icmpv6);