[mirror_ubuntu-hirsute-kernel.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/nf_conntrack_zones.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 inline struct nf_icmp_net *icmpv6_pernet(struct net *net)
{
	return &net->ct.nf_ct_proto.icmpv6;
}

static bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
				unsigned int dataoff,
				struct net *net,
				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;
}

static unsigned int *icmpv6_get_timeouts(struct net *net)
{
	return &icmpv6_pernet(net)->timeout;
}

/* 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 *timeout)
{
	/* 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, *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, unsigned int *timeouts)
{
	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);
		return false;
	}
	return true;
}

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

	WARN_ON(skb_nfct(skb));

	/* 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, net, &origtuple)) {
		pr_debug("icmpv6_error: Can't get tuple\n");
		return -NF_ACCEPT;
	}

	/* rcu_read_lock()ed by nf_hook_thresh */
	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, nf_ct_zone_tmpl(tmpl, skb, &tmp),
				  &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 */
	nf_ct_set(skb, nf_ct_tuplehash_to_ctrack(h), ctinfo);
	return NF_ACCEPT;
}

static void icmpv6_error_log(const struct sk_buff *skb, struct net *net,
			     u8 pf, const char *msg)
{
	nf_l4proto_log_invalid(skb, net, pf, IPPROTO_ICMPV6, "%s", msg);
}

static int
icmpv6_error(struct net *net, struct nf_conn *tmpl,
	     struct sk_buff *skb, unsigned int dataoff,
	     u8 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) {
		icmpv6_error_log(skb, net, pf, "short packet");
		return -NF_ACCEPT;
	}

	if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
	    nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
		icmpv6_error_log(skb, net, pf, "ICMPv6 checksum failed");
		return -NF_ACCEPT;
	}

	type = icmp6h->icmp6_type - 130;
	if (type >= 0 && type < sizeof(noct_valid_new) &&
	    noct_valid_new[type]) {
		nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
		return NF_ACCEPT;
	}

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

	return icmpv6_error_message(net, tmpl, skb, dataoff);
}

#if IS_ENABLED(CONFIG_NF_CT_NETLINK)

#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)
{
	if (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))
		goto nla_put_failure;
	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

#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)

#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_cttimeout.h>

static int icmpv6_timeout_nlattr_to_obj(struct nlattr *tb[],
					struct net *net, void *data)
{
	unsigned int *timeout = data;
	struct nf_icmp_net *in = icmpv6_pernet(net);

	if (tb[CTA_TIMEOUT_ICMPV6_TIMEOUT]) {
		*timeout =
		    ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMPV6_TIMEOUT])) * HZ;
	} else {
		/* Set default ICMPv6 timeout. */
		*timeout = in->timeout;
	}
	return 0;
}

static int
icmpv6_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
{
	const unsigned int *timeout = data;

	if (nla_put_be32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ)))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -ENOSPC;
}

static const struct nla_policy
icmpv6_timeout_nla_policy[CTA_TIMEOUT_ICMPV6_MAX+1] = {
	[CTA_TIMEOUT_ICMPV6_TIMEOUT]	= { .type = NLA_U32 },
};
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */

#ifdef CONFIG_SYSCTL
static struct ctl_table icmpv6_sysctl_table[] = {
	{
		.procname	= "nf_conntrack_icmpv6_timeout",
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_jiffies,
	},
	{ }
};
#endif /* CONFIG_SYSCTL */

static int icmpv6_kmemdup_sysctl_table(struct nf_proto_net *pn,
				       struct nf_icmp_net *in)
{
#ifdef CONFIG_SYSCTL
	pn->ctl_table = kmemdup(icmpv6_sysctl_table,
				sizeof(icmpv6_sysctl_table),
				GFP_KERNEL);
	if (!pn->ctl_table)
		return -ENOMEM;

	pn->ctl_table[0].data = &in->timeout;
#endif
	return 0;
}

static int icmpv6_init_net(struct net *net, u_int16_t proto)
{
	struct nf_icmp_net *in = icmpv6_pernet(net);
	struct nf_proto_net *pn = &in->pn;

	in->timeout = nf_ct_icmpv6_timeout;

	return icmpv6_kmemdup_sysctl_table(pn, in);
}

static struct nf_proto_net *icmpv6_get_net_proto(struct net *net)
{
	return &net->ct.nf_ct_proto.icmpv6.pn;
}

struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly =
{
	.l3proto		= PF_INET6,
	.l4proto		= IPPROTO_ICMPV6,
	.pkt_to_tuple		= icmpv6_pkt_to_tuple,
	.invert_tuple		= icmpv6_invert_tuple,
	.packet			= icmpv6_packet,
	.get_timeouts		= icmpv6_get_timeouts,
	.new			= icmpv6_new,
	.error			= icmpv6_error,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
	.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
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
	.ctnl_timeout		= {
		.nlattr_to_obj	= icmpv6_timeout_nlattr_to_obj,
		.obj_to_nlattr	= icmpv6_timeout_obj_to_nlattr,
		.nlattr_max	= CTA_TIMEOUT_ICMP_MAX,
		.obj_size	= sizeof(unsigned int),
		.nla_policy	= icmpv6_timeout_nla_policy,
	},
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
	.init_net		= icmpv6_init_net,
	.get_net_proto		= icmpv6_get_net_proto,
};
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	25	#include <net/netfilter/nf_conntrack_core.h>
5d0aa2cc	26	#include <net/netfilter/nf_conntrack_zones.h>
9fb9cbb1	27	#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
f01ffbd6	28	#include <net/netfilter/nf_log.h>
9fb9cbb1	29
71320afc	30	static unsigned int nf_ct_icmpv6_timeout __read_mostly = 30*HZ;
9fb9cbb1	31
7080ba09 G	32	static inline struct nf_icmp_net icmpv6_pernet(struct net net)
	33	{
	34	return &net->ct.nf_ct_proto.icmpv6;
	35	}
	36
09f263cd JE	37	static bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
09f263cd JE	38	unsigned int dataoff,
a31f1adc	39	struct net *net,
09f263cd	40	struct nf_conntrack_tuple *tuple)
9fb9cbb1	41	{
7cc3864d JE	42	const struct icmp6hdr *hp;
7cc3864d JE	43	struct icmp6hdr _hdr;
9fb9cbb1 YK	44
	45	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	46	if (hp == NULL)
09f263cd	47	return false;
9fb9cbb1 YK	48	tuple->dst.u.icmp.type = hp->icmp6_type;
	49	tuple->src.u.icmp.id = hp->icmp6_identifier;
	50	tuple->dst.u.icmp.code = hp->icmp6_code;
	51
09f263cd	52	return true;
9fb9cbb1 YK	53	}
9fb9cbb1 YK	54
c1d10adb	55	/* Add 1; spaces filled with 0. */
7cc3864d	56	static const u_int8_t invmap[] = {
c1d10adb PNA	57	[ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1,
c1d10adb PNA	58	[ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1,
a51f42f3	59	[ICMPV6_NI_QUERY - 128] = ICMPV6_NI_REPLY + 1,
f9527ea9	60	[ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY + 1
c1d10adb PNA	61	};
c1d10adb PNA	62
3f900713 EL	63	static const u_int8_t noct_valid_new[] = {
3f900713 EL	64	[ICMPV6_MGM_QUERY - 130] = 1,
f9527ea9	65	[ICMPV6_MGM_REPORT - 130] = 1,
3f900713 EL	66	[ICMPV6_MGM_REDUCTION - 130] = 1,
	67	[NDISC_ROUTER_SOLICITATION - 130] = 1,
	68	[NDISC_ROUTER_ADVERTISEMENT - 130] = 1,
	69	[NDISC_NEIGHBOUR_SOLICITATION - 130] = 1,
	70	[NDISC_NEIGHBOUR_ADVERTISEMENT - 130] = 1,
	71	[ICMPV6_MLD2_REPORT - 130] = 1
	72	};
	73
09f263cd JE	74	static bool icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
09f263cd JE	75	const struct nf_conntrack_tuple *orig)
9fb9cbb1	76	{
f16c9107 YK	77	int type = orig->dst.u.icmp.type - 128;
f16c9107 YK	78	if (type < 0 \|\| type >= sizeof(invmap) \|\| !invmap[type])
09f263cd	79	return false;
9fb9cbb1 YK	80
	81	tuple->src.u.icmp.id = orig->src.u.icmp.id;
	82	tuple->dst.u.icmp.type = invmap[type] - 1;
	83	tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
09f263cd	84	return true;
9fb9cbb1 YK	85	}
9fb9cbb1 YK	86
2c8503f5 PNA	87	static unsigned int icmpv6_get_timeouts(struct net net)
2c8503f5 PNA	88	{
7080ba09	89	return &icmpv6_pernet(net)->timeout;
2c8503f5 PNA	90	}
2c8503f5 PNA	91
9fb9cbb1 YK	92	/* Returns verdict for packet, or -1 for invalid. */
	93	static int icmpv6_packet(struct nf_conn *ct,
	94	const struct sk_buff *skb,
	95	unsigned int dataoff,
	96	enum ip_conntrack_info ctinfo,
76108cea	97	u_int8_t pf,
2c8503f5	98	unsigned int *timeout)
9fb9cbb1	99	{
f87fb666 JK	100	/* Do not immediately delete the connection after the first
	101	successful reply to avoid excessive conntrackd traffic
	102	and also to handle correctly ICMP echo reply duplicates. */
2c8503f5	103	nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
9fb9cbb1 YK	104
	105	return NF_ACCEPT;
	106	}
	107
	108	/* Called when a new connection for this protocol found. */
09f263cd	109	static bool icmpv6_new(struct nf_conn ct, const struct sk_buff skb,
2c8503f5	110	unsigned int dataoff, unsigned int *timeouts)
9fb9cbb1	111	{
7cc3864d	112	static const u_int8_t valid_new[] = {
9fb9cbb1 YK	113	[ICMPV6_ECHO_REQUEST - 128] = 1,
	114	[ICMPV6_NI_QUERY - 128] = 1
	115	};
c88130bc	116	int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128;
9fb9cbb1	117
f16c9107	118	if (type < 0 \|\| type >= sizeof(valid_new) \|\| !valid_new[type]) {
9fb9cbb1	119	/* Can't create a new ICMPv6 `conn' with this. */
0d53778e PM	120	pr_debug("icmpv6: can't create new conn with type %u\n",
0d53778e PM	121	type + 128);
3c9fba65	122	nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple);
09f263cd	123	return false;
9fb9cbb1	124	}
09f263cd	125	return true;
9fb9cbb1 YK	126	}
9fb9cbb1 YK	127
9fb9cbb1	128	static int
5d0aa2cc	129	icmpv6_error_message(struct net net, struct nf_conn tmpl,
74c51a14	130	struct sk_buff *skb,
d1c1e39d	131	unsigned int icmp6off)
9fb9cbb1 YK	132	{
9fb9cbb1 YK	133	struct nf_conntrack_tuple intuple, origtuple;
7cc3864d JE	134	const struct nf_conntrack_tuple_hash *h;
7cc3864d JE	135	const struct nf_conntrack_l4proto *inproto;
11df4b76	136	enum ip_conntrack_info ctinfo;
5e8018fc	137	struct nf_conntrack_zone tmp;
9fb9cbb1	138
44d6e2f2	139	WARN_ON(skb_nfct(skb));
9fb9cbb1	140
9fb9cbb1	141	/* Are they talking about one of our connections? */
e2a3123f YK	142	if (!nf_ct_get_tuplepr(skb,
	143	skb_network_offset(skb)
	144	+ sizeof(struct ipv6hdr)
	145	+ sizeof(struct icmp6hdr),
a31f1adc	146	PF_INET6, net, &origtuple)) {
0d53778e	147	pr_debug("icmpv6_error: Can't get tuple\n");
9fb9cbb1 YK	148	return -NF_ACCEPT;
	149	}
	150
e2361cb9	151	/* rcu_read_lock()ed by nf_hook_thresh */
e2a3123f YK	152	inproto = __nf_ct_l4proto_find(PF_INET6, origtuple.dst.protonum);
e2a3123f YK	153
9fb9cbb1 YK	154	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	155	been preserved inside the ICMP. */
	156	if (!nf_ct_invert_tuple(&intuple, &origtuple,
	157	&nf_conntrack_l3proto_ipv6, inproto)) {
0d53778e	158	pr_debug("icmpv6_error: Can't invert tuple\n");
9fb9cbb1 YK	159	return -NF_ACCEPT;
	160	}
	161
11df4b76	162	ctinfo = IP_CT_RELATED;
9fb9cbb1	163
5e8018fc DB	164	h = nf_conntrack_find_get(net, nf_ct_zone_tmpl(tmpl, skb, &tmp),
5e8018fc DB	165	&intuple);
9fb9cbb1	166	if (!h) {
0d53778e	167	pr_debug("icmpv6_error: no match\n");
9fb9cbb1 YK	168	return -NF_ACCEPT;
	169	} else {
	170	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
11df4b76	171	ctinfo += IP_CT_IS_REPLY;
9fb9cbb1 YK	172	}
	173
	174	/* Update skb to refer to this connection */
c74454fa	175	nf_ct_set(skb, nf_ct_tuplehash_to_ctrack(h), ctinfo);
88ed01d1	176	return NF_ACCEPT;
9fb9cbb1 YK	177	}
9fb9cbb1 YK	178
c4f3db15 FW	179	static void icmpv6_error_log(const struct sk_buff skb, struct net net,
	180	u8 pf, const char *msg)
	181	{
	182	nf_l4proto_log_invalid(skb, net, pf, IPPROTO_ICMPV6, "%s", msg);
	183	}
	184
9fb9cbb1	185	static int
8fea97ec PM	186	icmpv6_error(struct net net, struct nf_conn tmpl,
8fea97ec PM	187	struct sk_buff *skb, unsigned int dataoff,
11df4b76	188	u8 pf, unsigned int hooknum)
9fb9cbb1	189	{
7cc3864d JE	190	const struct icmp6hdr *icmp6h;
7cc3864d JE	191	struct icmp6hdr _ih;
3f900713	192	int type;
9fb9cbb1 YK	193
	194	icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
	195	if (icmp6h == NULL) {
c4f3db15	196	icmpv6_error_log(skb, net, pf, "short packet");
9fb9cbb1 YK	197	return -NF_ACCEPT;
	198	}
	199
c04d0552	200	if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
96f6bf82	201	nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
c4f3db15	202	icmpv6_error_log(skb, net, pf, "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]) {
cc41c84b	209	nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
3f900713 EL	210	return NF_ACCEPT;
	211	}
	212
9fb9cbb1 YK	213	/* is not error message ? */
	214	if (icmp6h->icmp6_type >= 128)
	215	return NF_ACCEPT;
	216
d1c1e39d	217	return icmpv6_error_message(net, tmpl, skb, dataoff);
9fb9cbb1 YK	218	}
9fb9cbb1 YK	219
07a93626	220	#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
c1d10adb PNA	221
	222	#include <linux/netfilter/nfnetlink.h>
	223	#include <linux/netfilter/nfnetlink_conntrack.h>
fdf70832	224	static int icmpv6_tuple_to_nlattr(struct sk_buff *skb,
c1d10adb PNA	225	const struct nf_conntrack_tuple *t)
c1d10adb PNA	226	{
e549a6b3 DM	227	if (nla_put_be16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id) \|\|
	228	nla_put_u8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type) \|\|
	229	nla_put_u8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code))
	230	goto nla_put_failure;
c1d10adb PNA	231	return 0;
c1d10adb PNA	232
df6fb868	233	nla_put_failure:
c1d10adb PNA	234	return -1;
	235	}
	236
f73e924c PM	237	static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = {
	238	[CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 },
	239	[CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 },
	240	[CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 },
c1d10adb PNA	241	};
c1d10adb PNA	242
fdf70832	243	static int icmpv6_nlattr_to_tuple(struct nlattr *tb[],
c1d10adb PNA	244	struct nf_conntrack_tuple *tuple)
c1d10adb PNA	245	{
3666ed1c JP	246	if (!tb[CTA_PROTO_ICMPV6_TYPE] \|\|
	247	!tb[CTA_PROTO_ICMPV6_CODE] \|\|
	248	!tb[CTA_PROTO_ICMPV6_ID])
c1d10adb PNA	249	return -EINVAL;
c1d10adb PNA	250
77236b6e PM	251	tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]);
	252	tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]);
	253	tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]);
c1d10adb	254
3666ed1c JP	255	if (tuple->dst.u.icmp.type < 128 \|\|
	256	tuple->dst.u.icmp.type - 128 >= sizeof(invmap) \|\|
	257	!invmap[tuple->dst.u.icmp.type - 128])
c1d10adb PNA	258	return -EINVAL;
	259
	260	return 0;
	261	}
a400c30e HE	262
	263	static int icmpv6_nlattr_tuple_size(void)
	264	{
	265	return nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1);
	266	}
c1d10adb PNA	267	#endif
c1d10adb PNA	268
50978462 PNA	269	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
	270
	271	#include <linux/netfilter/nfnetlink.h>
	272	#include <linux/netfilter/nfnetlink_cttimeout.h>
	273
8264deb8 G	274	static int icmpv6_timeout_nlattr_to_obj(struct nlattr *tb[],
8264deb8 G	275	struct net net, void data)
50978462 PNA	276	{
50978462 PNA	277	unsigned int *timeout = data;
8264deb8	278	struct nf_icmp_net *in = icmpv6_pernet(net);
50978462 PNA	279
	280	if (tb[CTA_TIMEOUT_ICMPV6_TIMEOUT]) {
	281	*timeout =
	282	ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMPV6_TIMEOUT])) * HZ;
	283	} else {
	284	/* Set default ICMPv6 timeout. */
8264deb8	285	*timeout = in->timeout;
50978462 PNA	286	}
	287	return 0;
	288	}
	289
	290	static int
	291	icmpv6_timeout_obj_to_nlattr(struct sk_buff skb, const void data)
	292	{
	293	const unsigned int *timeout = data;
	294
e549a6b3 DM	295	if (nla_put_be32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ)))
e549a6b3 DM	296	goto nla_put_failure;
50978462 PNA	297	return 0;
	298
	299	nla_put_failure:
	300	return -ENOSPC;
	301	}
	302
	303	static const struct nla_policy
	304	icmpv6_timeout_nla_policy[CTA_TIMEOUT_ICMPV6_MAX+1] = {
	305	[CTA_TIMEOUT_ICMPV6_TIMEOUT] = { .type = NLA_U32 },
	306	};
	307	#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
	308
933a41e7	309	#ifdef CONFIG_SYSCTL
933a41e7 PM	310	static struct ctl_table icmpv6_sysctl_table[] = {
933a41e7 PM	311	{
933a41e7	312	.procname = "nf_conntrack_icmpv6_timeout",
933a41e7 PM	313	.maxlen = sizeof(unsigned int),
933a41e7 PM	314	.mode = 0644,
6d9f239a	315	.proc_handler = proc_dointvec_jiffies,
933a41e7	316	},
f8572d8f	317	{ }
933a41e7 PM	318	};
	319	#endif /* CONFIG_SYSCTL */
	320
8fc02781 G	321	static int icmpv6_kmemdup_sysctl_table(struct nf_proto_net *pn,
8fc02781 G	322	struct nf_icmp_net *in)
7080ba09	323	{
7080ba09 G	324	#ifdef CONFIG_SYSCTL
	325	pn->ctl_table = kmemdup(icmpv6_sysctl_table,
	326	sizeof(icmpv6_sysctl_table),
	327	GFP_KERNEL);
	328	if (!pn->ctl_table)
	329	return -ENOMEM;
8fc02781	330
7080ba09 G	331	pn->ctl_table[0].data = &in->timeout;
	332	#endif
	333	return 0;
	334	}
	335
8fc02781 G	336	static int icmpv6_init_net(struct net *net, u_int16_t proto)
	337	{
	338	struct nf_icmp_net *in = icmpv6_pernet(net);
	339	struct nf_proto_net *pn = &in->pn;
	340
	341	in->timeout = nf_ct_icmpv6_timeout;
	342
	343	return icmpv6_kmemdup_sysctl_table(pn, in);
	344	}
	345
08911475 PNA	346	static struct nf_proto_net icmpv6_get_net_proto(struct net net)
	347	{
	348	return &net->ct.nf_ct_proto.icmpv6.pn;
	349	}
	350
61075af5	351	struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly =
9fb9cbb1 YK	352	{
9fb9cbb1 YK	353	.l3proto = PF_INET6,
605dcad6	354	.l4proto = IPPROTO_ICMPV6,
9fb9cbb1 YK	355	.pkt_to_tuple = icmpv6_pkt_to_tuple,
9fb9cbb1 YK	356	.invert_tuple = icmpv6_invert_tuple,
9fb9cbb1	357	.packet = icmpv6_packet,
2c8503f5	358	.get_timeouts = icmpv6_get_timeouts,
9fb9cbb1 YK	359	.new = icmpv6_new,
9fb9cbb1 YK	360	.error = icmpv6_error,
07a93626	361	#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
fdf70832	362	.tuple_to_nlattr = icmpv6_tuple_to_nlattr,
a400c30e	363	.nlattr_tuple_size = icmpv6_nlattr_tuple_size,
fdf70832	364	.nlattr_to_tuple = icmpv6_nlattr_to_tuple,
f73e924c	365	.nla_policy = icmpv6_nla_policy,
c1d10adb	366	#endif
50978462 PNA	367	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
	368	.ctnl_timeout = {
	369	.nlattr_to_obj = icmpv6_timeout_nlattr_to_obj,
	370	.obj_to_nlattr = icmpv6_timeout_obj_to_nlattr,
	371	.nlattr_max = CTA_TIMEOUT_ICMP_MAX,
	372	.obj_size = sizeof(unsigned int),
	373	.nla_policy = icmpv6_timeout_nla_policy,
	374	},
	375	#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
7080ba09	376	.init_net = icmpv6_init_net,
08911475	377	.get_net_proto = icmpv6_get_net_proto,
9fb9cbb1	378	};