[net-next-2.6.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)
{
	/* 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_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;
	}
	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 nf_conn *tmpl,
	     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)) {
		if (LOG_INVALID(net, IPPROTO_ICMPV6))
			nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
				      "nf_ct_icmpv6: ICMPv6 checksum failed ");
		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;
}

static int icmpv6_nlattr_tuple_size(void)
{
	return nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1);
}
#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,
	},
	{ }
};
#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_tuple_size	= icmpv6_nlattr_tuple_size,
	.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)
9fb9cbb1 YK	97	{
f87fb666 JK	98	/* Do not immediately delete the connection after the first
	99	successful reply to avoid excessive conntrackd traffic
	100	and also to handle correctly ICMP echo reply duplicates. */
	101	nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmpv6_timeout);
9fb9cbb1 YK	102
	103	return NF_ACCEPT;
	104	}
	105
	106	/* Called when a new connection for this protocol found. */
09f263cd JE	107	static bool icmpv6_new(struct nf_conn ct, const struct sk_buff skb,
09f263cd JE	108	unsigned int dataoff)
9fb9cbb1	109	{
7cc3864d	110	static const u_int8_t valid_new[] = {
9fb9cbb1 YK	111	[ICMPV6_ECHO_REQUEST - 128] = 1,
	112	[ICMPV6_NI_QUERY - 128] = 1
	113	};
c88130bc	114	int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128;
9fb9cbb1	115
f16c9107	116	if (type < 0 \|\| type >= sizeof(valid_new) \|\| !valid_new[type]) {
9fb9cbb1	117	/* Can't create a new ICMPv6 `conn' with this. */
0d53778e PM	118	pr_debug("icmpv6: can't create new conn with type %u\n",
0d53778e PM	119	type + 128);
3c9fba65	120	nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple);
55df4ac0 EL	121	if (LOG_INVALID(nf_ct_net(ct), IPPROTO_ICMPV6))
	122	nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
	123	"nf_ct_icmpv6: invalid new with type %d ",
	124	type + 128);
09f263cd	125	return false;
9fb9cbb1	126	}
09f263cd	127	return true;
9fb9cbb1 YK	128	}
9fb9cbb1 YK	129
9fb9cbb1	130	static int
74c51a14 AD	131	icmpv6_error_message(struct net *net,
74c51a14 AD	132	struct sk_buff *skb,
9fb9cbb1 YK	133	unsigned int icmp6off,
	134	enum ip_conntrack_info *ctinfo,
	135	unsigned int hooknum)
	136	{
	137	struct nf_conntrack_tuple intuple, origtuple;
7cc3864d JE	138	const struct nf_conntrack_tuple_hash *h;
7cc3864d JE	139	const struct nf_conntrack_l4proto *inproto;
9fb9cbb1 YK	140
	141	NF_CT_ASSERT(skb->nfct == NULL);
	142
9fb9cbb1	143	/* Are they talking about one of our connections? */
e2a3123f YK	144	if (!nf_ct_get_tuplepr(skb,
	145	skb_network_offset(skb)
	146	+ sizeof(struct ipv6hdr)
	147	+ sizeof(struct icmp6hdr),
	148	PF_INET6, &origtuple)) {
0d53778e	149	pr_debug("icmpv6_error: Can't get tuple\n");
9fb9cbb1 YK	150	return -NF_ACCEPT;
	151	}
	152
e2a3123f YK	153	/* rcu_read_lock()ed by nf_hook_slow */
	154	inproto = __nf_ct_l4proto_find(PF_INET6, origtuple.dst.protonum);
	155
9fb9cbb1 YK	156	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	157	been preserved inside the ICMP. */
	158	if (!nf_ct_invert_tuple(&intuple, &origtuple,
	159	&nf_conntrack_l3proto_ipv6, inproto)) {
0d53778e	160	pr_debug("icmpv6_error: Can't invert tuple\n");
9fb9cbb1 YK	161	return -NF_ACCEPT;
	162	}
	163
	164	*ctinfo = IP_CT_RELATED;
	165
74c51a14	166	h = nf_conntrack_find_get(net, &intuple);
9fb9cbb1	167	if (!h) {
0d53778e	168	pr_debug("icmpv6_error: no match\n");
9fb9cbb1 YK	169	return -NF_ACCEPT;
	170	} else {
	171	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
	172	*ctinfo += IP_CT_IS_REPLY;
	173	}
	174
	175	/* Update skb to refer to this connection */
	176	skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
	177	skb->nfctinfo = *ctinfo;
	178	return -NF_ACCEPT;
	179	}
	180
	181	static int
8fea97ec PM	182	icmpv6_error(struct net net, struct nf_conn tmpl,
8fea97ec PM	183	struct sk_buff *skb, unsigned int dataoff,
76108cea	184	enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum)
9fb9cbb1	185	{
7cc3864d JE	186	const struct icmp6hdr *icmp6h;
7cc3864d JE	187	struct icmp6hdr _ih;
3f900713	188	int type;
9fb9cbb1 YK	189
	190	icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
	191	if (icmp6h == NULL) {
c2a2c7e0	192	if (LOG_INVALID(net, IPPROTO_ICMPV6))
9fb9cbb1 YK	193	nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
	194	"nf_ct_icmpv6: short packet ");
	195	return -NF_ACCEPT;
	196	}
	197
c04d0552	198	if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
96f6bf82	199	nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
4aa3b2ee EL	200	if (LOG_INVALID(net, IPPROTO_ICMPV6))
	201	nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
	202	"nf_ct_icmpv6: ICMPv6 checksum failed ");
9fb9cbb1 YK	203	return -NF_ACCEPT;
	204	}
	205
3f900713 EL	206	type = icmp6h->icmp6_type - 130;
	207	if (type >= 0 && type < sizeof(noct_valid_new) &&
	208	noct_valid_new[type]) {
	209	skb->nfct = &nf_conntrack_untracked.ct_general;
	210	skb->nfctinfo = IP_CT_NEW;
	211	nf_conntrack_get(skb->nfct);
	212	return NF_ACCEPT;
	213	}
	214
9fb9cbb1 YK	215	/* is not error message ? */
	216	if (icmp6h->icmp6_type >= 128)
	217	return NF_ACCEPT;
	218
74c51a14	219	return icmpv6_error_message(net, skb, dataoff, ctinfo, hooknum);
9fb9cbb1 YK	220	}
9fb9cbb1 YK	221
e281db5c	222	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
c1d10adb PNA	223
	224	#include <linux/netfilter/nfnetlink.h>
	225	#include <linux/netfilter/nfnetlink_conntrack.h>
fdf70832	226	static int icmpv6_tuple_to_nlattr(struct sk_buff *skb,
c1d10adb PNA	227	const struct nf_conntrack_tuple *t)
c1d10adb PNA	228	{
77236b6e PM	229	NLA_PUT_BE16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id);
	230	NLA_PUT_U8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type);
	231	NLA_PUT_U8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code);
c1d10adb PNA	232
	233	return 0;
	234
df6fb868	235	nla_put_failure:
c1d10adb PNA	236	return -1;
	237	}
	238
f73e924c PM	239	static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = {
	240	[CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 },
	241	[CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 },
	242	[CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 },
c1d10adb PNA	243	};
c1d10adb PNA	244
fdf70832	245	static int icmpv6_nlattr_to_tuple(struct nlattr *tb[],
c1d10adb PNA	246	struct nf_conntrack_tuple *tuple)
c1d10adb PNA	247	{
3666ed1c JP	248	if (!tb[CTA_PROTO_ICMPV6_TYPE] \|\|
	249	!tb[CTA_PROTO_ICMPV6_CODE] \|\|
	250	!tb[CTA_PROTO_ICMPV6_ID])
c1d10adb PNA	251	return -EINVAL;
c1d10adb PNA	252
77236b6e PM	253	tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]);
	254	tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]);
	255	tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]);
c1d10adb	256
3666ed1c JP	257	if (tuple->dst.u.icmp.type < 128 \|\|
	258	tuple->dst.u.icmp.type - 128 >= sizeof(invmap) \|\|
	259	!invmap[tuple->dst.u.icmp.type - 128])
c1d10adb PNA	260	return -EINVAL;
	261
	262	return 0;
	263	}
a400c30e HE	264
	265	static int icmpv6_nlattr_tuple_size(void)
	266	{
	267	return nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1);
	268	}
c1d10adb PNA	269	#endif
c1d10adb PNA	270
933a41e7 PM	271	#ifdef CONFIG_SYSCTL
	272	static struct ctl_table_header *icmpv6_sysctl_header;
	273	static struct ctl_table icmpv6_sysctl_table[] = {
	274	{
933a41e7 PM	275	.procname = "nf_conntrack_icmpv6_timeout",
	276	.data = &nf_ct_icmpv6_timeout,
	277	.maxlen = sizeof(unsigned int),
	278	.mode = 0644,
6d9f239a	279	.proc_handler = proc_dointvec_jiffies,
933a41e7	280	},
f8572d8f	281	{ }
933a41e7 PM	282	};
	283	#endif /* CONFIG_SYSCTL */
	284
61075af5	285	struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly =
9fb9cbb1 YK	286	{
9fb9cbb1 YK	287	.l3proto = PF_INET6,
605dcad6	288	.l4proto = IPPROTO_ICMPV6,
9fb9cbb1 YK	289	.name = "icmpv6",
	290	.pkt_to_tuple = icmpv6_pkt_to_tuple,
	291	.invert_tuple = icmpv6_invert_tuple,
	292	.print_tuple = icmpv6_print_tuple,
9fb9cbb1 YK	293	.packet = icmpv6_packet,
	294	.new = icmpv6_new,
	295	.error = icmpv6_error,
e281db5c	296	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
fdf70832	297	.tuple_to_nlattr = icmpv6_tuple_to_nlattr,
a400c30e	298	.nlattr_tuple_size = icmpv6_nlattr_tuple_size,
fdf70832	299	.nlattr_to_tuple = icmpv6_nlattr_to_tuple,
f73e924c	300	.nla_policy = icmpv6_nla_policy,
c1d10adb	301	#endif
933a41e7 PM	302	#ifdef CONFIG_SYSCTL
	303	.ctl_table_header = &icmpv6_sysctl_header,
	304	.ctl_table = icmpv6_sysctl_table,
	305	#endif
9fb9cbb1	306	};