[thirdparty/kernel/stable.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>
#include <net/netfilter/nf_log.h>

static unsigned int nf_ct_icmpv6_timeout __read_mostly = 30*HZ;

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

	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	if (hp == NULL)
		return false;
	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 true;
}

/* Add 1; spaces filled with 0. */
static const 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_REPLY + 1,
	[ICMPV6_NI_REPLY - 128]		= ICMPV6_NI_QUERY +1
};

static const u_int8_t noct_valid_new[] = {
	[ICMPV6_MGM_QUERY - 130] = 1,
	[ICMPV6_MGM_REPORT -130] = 1,
	[ICMPV6_MGM_REDUCTION - 130] = 1,
	[NDISC_ROUTER_SOLICITATION - 130] = 1,
	[NDISC_ROUTER_ADVERTISEMENT - 130] = 1,
	[NDISC_NEIGHBOUR_SOLICITATION - 130] = 1,
	[NDISC_NEIGHBOUR_ADVERTISEMENT - 130] = 1,
	[ICMPV6_MLD2_REPORT - 130] = 1
};

static bool 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 false;

	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 true;
}

/* 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));
}

/* 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,
		       u_int8_t 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))
			nf_ct_kill_acct(ct, ctinfo, skb);
	} else {
		atomic_inc(&ct->proto.icmp.count);
		nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, ct);
		nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmpv6_timeout);
	}

	return NF_ACCEPT;
}

/* Called when a new connection for this protocol found. */
static bool icmpv6_new(struct nf_conn *ct, const struct sk_buff *skb,
		       unsigned int dataoff)
{
	static const u_int8_t valid_new[] = {
		[ICMPV6_ECHO_REQUEST - 128] = 1,
		[ICMPV6_NI_QUERY - 128] = 1
	};
	int type = ct->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. */
		pr_debug("icmpv6: can't create new conn with type %u\n",
			 type + 128);
		nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple);
		if (LOG_INVALID(nf_ct_net(ct), IPPROTO_ICMPV6))
			nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
				      "nf_ct_icmpv6: invalid new with type %d ",
				      type + 128);
		return false;
	}
	atomic_set(&ct->proto.icmp.count, 0);
	return true;
}

static int
icmpv6_error_message(struct net *net,
		     struct sk_buff *skb,
		     unsigned int icmp6off,
		     enum ip_conntrack_info *ctinfo,
		     unsigned int hooknum)
{
	struct nf_conntrack_tuple intuple, origtuple;
	const struct nf_conntrack_tuple_hash *h;
	const struct nf_conntrack_l4proto *inproto;

	NF_CT_ASSERT(skb->nfct == NULL);

	/* Are they talking about one of our connections? */
	if (!nf_ct_get_tuplepr(skb,
			       skb_network_offset(skb)
				+ sizeof(struct ipv6hdr)
				+ sizeof(struct icmp6hdr),
			       PF_INET6, &origtuple)) {
		pr_debug("icmpv6_error: Can't get tuple\n");
		return -NF_ACCEPT;
	}

	/* rcu_read_lock()ed by nf_hook_slow */
	inproto = __nf_ct_l4proto_find(PF_INET6, origtuple.dst.protonum);

	/* 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)) {
		pr_debug("icmpv6_error: Can't invert tuple\n");
		return -NF_ACCEPT;
	}

	*ctinfo = IP_CT_RELATED;

	h = nf_conntrack_find_get(net, &intuple);
	if (!h) {
		pr_debug("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 net *net, struct sk_buff *skb, unsigned int dataoff,
	     enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum)
{
	const struct icmp6hdr *icmp6h;
	struct icmp6hdr _ih;
	int type;

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

	if (net->ct.sysctl_checksum && hooknum == NF_INET_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;
	}

	type = icmp6h->icmp6_type - 130;
	if (type >= 0 && type < sizeof(noct_valid_new) &&
	    noct_valid_new[type]) {
		skb->nfct = &nf_conntrack_untracked.ct_general;
		skb->nfctinfo = IP_CT_NEW;
		nf_conntrack_get(skb->nfct);
		return NF_ACCEPT;
	}

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

	return icmpv6_error_message(net, 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_nlattr(struct sk_buff *skb,
				  const struct nf_conntrack_tuple *t)
{
	NLA_PUT_BE16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id);
	NLA_PUT_U8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type);
	NLA_PUT_U8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code);

	return 0;

nla_put_failure:
	return -1;
}

static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = {
	[CTA_PROTO_ICMPV6_TYPE]	= { .type = NLA_U8 },
	[CTA_PROTO_ICMPV6_CODE]	= { .type = NLA_U8 },
	[CTA_PROTO_ICMPV6_ID]	= { .type = NLA_U16 },
};

static int icmpv6_nlattr_to_tuple(struct nlattr *tb[],
				struct nf_conntrack_tuple *tuple)
{
	if (!tb[CTA_PROTO_ICMPV6_TYPE]
	    || !tb[CTA_PROTO_ICMPV6_CODE]
	    || !tb[CTA_PROTO_ICMPV6_ID])
		return -EINVAL;

	tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]);
	tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]);
	tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]);

	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[] = {
	{
		.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 __read_mostly =
{
	.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,
	.packet			= icmpv6_packet,
	.new			= icmpv6_new,
	.error			= icmpv6_error,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
	.tuple_to_nlattr	= icmpv6_tuple_to_nlattr,
	.nlattr_to_tuple	= icmpv6_nlattr_to_tuple,
	.nla_policy		= icmpv6_nla_policy,
#endif
#ifdef CONFIG_SYSCTL
	.ctl_table_header	= &icmpv6_sysctl_header,
	.ctl_table		= icmpv6_sysctl_table,
#endif
};
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>
9fb9cbb1 YK	26	#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
f01ffbd6	27	#include <net/netfilter/nf_log.h>
9fb9cbb1	28
71320afc	29	static unsigned int nf_ct_icmpv6_timeout __read_mostly = 30*HZ;
9fb9cbb1	30
09f263cd JE	31	static bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
	32	unsigned int dataoff,
	33	struct nf_conntrack_tuple *tuple)
9fb9cbb1	34	{
7cc3864d JE	35	const struct icmp6hdr *hp;
7cc3864d JE	36	struct icmp6hdr _hdr;
9fb9cbb1 YK	37
	38	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	39	if (hp == NULL)
09f263cd	40	return false;
9fb9cbb1 YK	41	tuple->dst.u.icmp.type = hp->icmp6_type;
	42	tuple->src.u.icmp.id = hp->icmp6_identifier;
	43	tuple->dst.u.icmp.code = hp->icmp6_code;
	44
09f263cd	45	return true;
9fb9cbb1 YK	46	}
9fb9cbb1 YK	47
c1d10adb	48	/* Add 1; spaces filled with 0. */
7cc3864d	49	static const u_int8_t invmap[] = {
c1d10adb PNA	50	[ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1,
c1d10adb PNA	51	[ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1,
a51f42f3 EL	52	[ICMPV6_NI_QUERY - 128] = ICMPV6_NI_REPLY + 1,
a51f42f3 EL	53	[ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY +1
c1d10adb PNA	54	};
c1d10adb PNA	55
3f900713 EL	56	static const u_int8_t noct_valid_new[] = {
	57	[ICMPV6_MGM_QUERY - 130] = 1,
	58	[ICMPV6_MGM_REPORT -130] = 1,
	59	[ICMPV6_MGM_REDUCTION - 130] = 1,
	60	[NDISC_ROUTER_SOLICITATION - 130] = 1,
	61	[NDISC_ROUTER_ADVERTISEMENT - 130] = 1,
	62	[NDISC_NEIGHBOUR_SOLICITATION - 130] = 1,
	63	[NDISC_NEIGHBOUR_ADVERTISEMENT - 130] = 1,
	64	[ICMPV6_MLD2_REPORT - 130] = 1
	65	};
	66
09f263cd JE	67	static bool icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
09f263cd JE	68	const struct nf_conntrack_tuple *orig)
9fb9cbb1	69	{
f16c9107 YK	70	int type = orig->dst.u.icmp.type - 128;
f16c9107 YK	71	if (type < 0 \|\| type >= sizeof(invmap) \|\| !invmap[type])
09f263cd	72	return false;
9fb9cbb1 YK	73
	74	tuple->src.u.icmp.id = orig->src.u.icmp.id;
	75	tuple->dst.u.icmp.type = invmap[type] - 1;
	76	tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
09f263cd	77	return true;
9fb9cbb1 YK	78	}
	79
	80	/* Print out the per-protocol part of the tuple. */
	81	static int icmpv6_print_tuple(struct seq_file *s,
	82	const struct nf_conntrack_tuple *tuple)
	83	{
	84	return seq_printf(s, "type=%u code=%u id=%u ",
	85	tuple->dst.u.icmp.type,
	86	tuple->dst.u.icmp.code,
	87	ntohs(tuple->src.u.icmp.id));
	88	}
	89
9fb9cbb1 YK	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,
76108cea	95	u_int8_t pf,
9fb9cbb1 YK	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	102	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
51091764	103	if (atomic_dec_and_test(&ct->proto.icmp.count))
718d4ad9	104	nf_ct_kill_acct(ct, ctinfo, skb);
9fb9cbb1 YK	105	} else {
9fb9cbb1 YK	106	atomic_inc(&ct->proto.icmp.count);
a71996fc	107	nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, ct);
9fb9cbb1 YK	108	nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmpv6_timeout);
	109	}
	110
	111	return NF_ACCEPT;
	112	}
	113
	114	/* Called when a new connection for this protocol found. */
09f263cd JE	115	static bool icmpv6_new(struct nf_conn ct, const struct sk_buff skb,
09f263cd JE	116	unsigned int dataoff)
9fb9cbb1	117	{
7cc3864d	118	static const u_int8_t valid_new[] = {
9fb9cbb1 YK	119	[ICMPV6_ECHO_REQUEST - 128] = 1,
	120	[ICMPV6_NI_QUERY - 128] = 1
	121	};
c88130bc	122	int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128;
9fb9cbb1	123
f16c9107	124	if (type < 0 \|\| type >= sizeof(valid_new) \|\| !valid_new[type]) {
9fb9cbb1	125	/* Can't create a new ICMPv6 `conn' with this. */
0d53778e PM	126	pr_debug("icmpv6: can't create new conn with type %u\n",
0d53778e PM	127	type + 128);
3c9fba65	128	nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple);
55df4ac0 EL	129	if (LOG_INVALID(nf_ct_net(ct), IPPROTO_ICMPV6))
	130	nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
	131	"nf_ct_icmpv6: invalid new with type %d ",
	132	type + 128);
09f263cd	133	return false;
9fb9cbb1	134	}
c88130bc	135	atomic_set(&ct->proto.icmp.count, 0);
09f263cd	136	return true;
9fb9cbb1 YK	137	}
9fb9cbb1 YK	138
9fb9cbb1	139	static int
74c51a14 AD	140	icmpv6_error_message(struct net *net,
74c51a14 AD	141	struct sk_buff *skb,
9fb9cbb1 YK	142	unsigned int icmp6off,
	143	enum ip_conntrack_info *ctinfo,
	144	unsigned int hooknum)
	145	{
	146	struct nf_conntrack_tuple intuple, origtuple;
7cc3864d JE	147	const struct nf_conntrack_tuple_hash *h;
7cc3864d JE	148	const struct nf_conntrack_l4proto *inproto;
9fb9cbb1 YK	149
	150	NF_CT_ASSERT(skb->nfct == NULL);
	151
9fb9cbb1	152	/* Are they talking about one of our connections? */
e2a3123f YK	153	if (!nf_ct_get_tuplepr(skb,
	154	skb_network_offset(skb)
	155	+ sizeof(struct ipv6hdr)
	156	+ sizeof(struct icmp6hdr),
	157	PF_INET6, &origtuple)) {
0d53778e	158	pr_debug("icmpv6_error: Can't get tuple\n");
9fb9cbb1 YK	159	return -NF_ACCEPT;
	160	}
	161
e2a3123f YK	162	/* rcu_read_lock()ed by nf_hook_slow */
	163	inproto = __nf_ct_l4proto_find(PF_INET6, origtuple.dst.protonum);
	164
9fb9cbb1 YK	165	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	166	been preserved inside the ICMP. */
	167	if (!nf_ct_invert_tuple(&intuple, &origtuple,
	168	&nf_conntrack_l3proto_ipv6, inproto)) {
0d53778e	169	pr_debug("icmpv6_error: Can't invert tuple\n");
9fb9cbb1 YK	170	return -NF_ACCEPT;
	171	}
	172
	173	*ctinfo = IP_CT_RELATED;
	174
74c51a14	175	h = nf_conntrack_find_get(net, &intuple);
9fb9cbb1	176	if (!h) {
0d53778e	177	pr_debug("icmpv6_error: no match\n");
9fb9cbb1 YK	178	return -NF_ACCEPT;
	179	} else {
	180	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
	181	*ctinfo += IP_CT_IS_REPLY;
	182	}
	183
	184	/* Update skb to refer to this connection */
	185	skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
	186	skb->nfctinfo = *ctinfo;
	187	return -NF_ACCEPT;
	188	}
	189
	190	static int
74c51a14	191	icmpv6_error(struct net net, struct sk_buff skb, unsigned int dataoff,
76108cea	192	enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum)
9fb9cbb1	193	{
7cc3864d JE	194	const struct icmp6hdr *icmp6h;
7cc3864d JE	195	struct icmp6hdr _ih;
3f900713	196	int type;
9fb9cbb1 YK	197
	198	icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
	199	if (icmp6h == NULL) {
c2a2c7e0	200	if (LOG_INVALID(net, IPPROTO_ICMPV6))
9fb9cbb1 YK	201	nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
	202	"nf_ct_icmpv6: short packet ");
	203	return -NF_ACCEPT;
	204	}
	205
c04d0552	206	if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
96f6bf82	207	nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
9fb9cbb1 YK	208	nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
	209	"nf_ct_icmpv6: ICMPv6 checksum failed\n");
	210	return -NF_ACCEPT;
	211	}
	212
3f900713 EL	213	type = icmp6h->icmp6_type - 130;
	214	if (type >= 0 && type < sizeof(noct_valid_new) &&
	215	noct_valid_new[type]) {
	216	skb->nfct = &nf_conntrack_untracked.ct_general;
	217	skb->nfctinfo = IP_CT_NEW;
	218	nf_conntrack_get(skb->nfct);
	219	return NF_ACCEPT;
	220	}
	221
9fb9cbb1 YK	222	/* is not error message ? */
	223	if (icmp6h->icmp6_type >= 128)
	224	return NF_ACCEPT;
	225
74c51a14	226	return icmpv6_error_message(net, skb, dataoff, ctinfo, hooknum);
9fb9cbb1 YK	227	}
9fb9cbb1 YK	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>
fdf70832	233	static int icmpv6_tuple_to_nlattr(struct sk_buff *skb,
c1d10adb PNA	234	const struct nf_conntrack_tuple *t)
c1d10adb PNA	235	{
77236b6e PM	236	NLA_PUT_BE16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id);
	237	NLA_PUT_U8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type);
	238	NLA_PUT_U8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code);
c1d10adb PNA	239
	240	return 0;
	241
df6fb868	242	nla_put_failure:
c1d10adb PNA	243	return -1;
	244	}
	245
f73e924c PM	246	static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = {
	247	[CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 },
	248	[CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 },
	249	[CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 },
c1d10adb PNA	250	};
c1d10adb PNA	251
fdf70832	252	static int icmpv6_nlattr_to_tuple(struct nlattr *tb[],
c1d10adb PNA	253	struct nf_conntrack_tuple *tuple)
c1d10adb PNA	254	{
df6fb868 PM	255	if (!tb[CTA_PROTO_ICMPV6_TYPE]
	256	\|\| !tb[CTA_PROTO_ICMPV6_CODE]
	257	\|\| !tb[CTA_PROTO_ICMPV6_ID])
c1d10adb PNA	258	return -EINVAL;
c1d10adb PNA	259
77236b6e PM	260	tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]);
	261	tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]);
	262	tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]);
c1d10adb PNA	263
	264	if (tuple->dst.u.icmp.type < 128
	265	\|\| tuple->dst.u.icmp.type - 128 >= sizeof(invmap)
	266	\|\| !invmap[tuple->dst.u.icmp.type - 128])
	267	return -EINVAL;
	268
	269	return 0;
	270	}
	271	#endif
	272
933a41e7 PM	273	#ifdef CONFIG_SYSCTL
	274	static struct ctl_table_header *icmpv6_sysctl_header;
	275	static struct ctl_table icmpv6_sysctl_table[] = {
	276	{
933a41e7 PM	277	.procname = "nf_conntrack_icmpv6_timeout",
	278	.data = &nf_ct_icmpv6_timeout,
	279	.maxlen = sizeof(unsigned int),
	280	.mode = 0644,
6d9f239a	281	.proc_handler = proc_dointvec_jiffies,
933a41e7 PM	282	},
	283	{
	284	.ctl_name = 0
	285	}
	286	};
	287	#endif /* CONFIG_SYSCTL */
	288
61075af5	289	struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly =
9fb9cbb1 YK	290	{
9fb9cbb1 YK	291	.l3proto = PF_INET6,
605dcad6	292	.l4proto = IPPROTO_ICMPV6,
9fb9cbb1 YK	293	.name = "icmpv6",
	294	.pkt_to_tuple = icmpv6_pkt_to_tuple,
	295	.invert_tuple = icmpv6_invert_tuple,
	296	.print_tuple = icmpv6_print_tuple,
9fb9cbb1 YK	297	.packet = icmpv6_packet,
	298	.new = icmpv6_new,
	299	.error = icmpv6_error,
e281db5c	300	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
fdf70832 PM	301	.tuple_to_nlattr = icmpv6_tuple_to_nlattr,
fdf70832 PM	302	.nlattr_to_tuple = icmpv6_nlattr_to_tuple,
f73e924c	303	.nla_policy = icmpv6_nla_policy,
c1d10adb	304	#endif
933a41e7 PM	305	#ifdef CONFIG_SYSCTL
	306	.ctl_table_header = &icmpv6_sysctl_header,
	307	.ctl_table = icmpv6_sysctl_table,
	308	#endif
9fb9cbb1	309	};