[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/nf_conntrack_zones.h>
#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
#include <net/netfilter/nf_log.h>

static const unsigned int nf_ct_icmpv6_timeout = 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,
		       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, 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 unsigned int icmpv6_nlattr_tuple_size(void)
{
	static unsigned int size __read_mostly;

	if (!size)
		size = nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1);

	return size;
}
#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;
}

const struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 =
{
	.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
2c9e8637	30	static const unsigned int nf_ct_icmpv6_timeout = 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,
2c8503f5	97	unsigned int *timeout)
9fb9cbb1	98	{
f87fb666 JK	99	/* Do not immediately delete the connection after the first
	100	successful reply to avoid excessive conntrackd traffic
	101	and also to handle correctly ICMP echo reply duplicates. */
2c8503f5	102	nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
9fb9cbb1 YK	103
	104	return NF_ACCEPT;
	105	}
	106
	107	/* Called when a new connection for this protocol found. */
09f263cd	108	static bool icmpv6_new(struct nf_conn ct, const struct sk_buff skb,
2c8503f5	109	unsigned int dataoff, unsigned int *timeouts)
9fb9cbb1	110	{
7cc3864d	111	static const u_int8_t valid_new[] = {
9fb9cbb1 YK	112	[ICMPV6_ECHO_REQUEST - 128] = 1,
	113	[ICMPV6_NI_QUERY - 128] = 1
	114	};
c88130bc	115	int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128;
9fb9cbb1	116
f16c9107	117	if (type < 0 \|\| type >= sizeof(valid_new) \|\| !valid_new[type]) {
9fb9cbb1	118	/* Can't create a new ICMPv6 `conn' with this. */
0d53778e PM	119	pr_debug("icmpv6: can't create new conn with type %u\n",
0d53778e PM	120	type + 128);
3c9fba65	121	nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple);
09f263cd	122	return false;
9fb9cbb1	123	}
09f263cd	124	return true;
9fb9cbb1 YK	125	}
9fb9cbb1 YK	126
9fb9cbb1	127	static int
5d0aa2cc	128	icmpv6_error_message(struct net net, struct nf_conn tmpl,
74c51a14	129	struct sk_buff *skb,
d1c1e39d	130	unsigned int icmp6off)
9fb9cbb1 YK	131	{
9fb9cbb1 YK	132	struct nf_conntrack_tuple intuple, origtuple;
7cc3864d JE	133	const struct nf_conntrack_tuple_hash *h;
7cc3864d JE	134	const struct nf_conntrack_l4proto *inproto;
11df4b76	135	enum ip_conntrack_info ctinfo;
5e8018fc	136	struct nf_conntrack_zone tmp;
9fb9cbb1	137
44d6e2f2	138	WARN_ON(skb_nfct(skb));
9fb9cbb1	139
9fb9cbb1	140	/* Are they talking about one of our connections? */
e2a3123f YK	141	if (!nf_ct_get_tuplepr(skb,
	142	skb_network_offset(skb)
	143	+ sizeof(struct ipv6hdr)
	144	+ sizeof(struct icmp6hdr),
a31f1adc	145	PF_INET6, net, &origtuple)) {
0d53778e	146	pr_debug("icmpv6_error: Can't get tuple\n");
9fb9cbb1 YK	147	return -NF_ACCEPT;
	148	}
	149
e2361cb9	150	/* rcu_read_lock()ed by nf_hook_thresh */
e2a3123f YK	151	inproto = __nf_ct_l4proto_find(PF_INET6, origtuple.dst.protonum);
e2a3123f YK	152
9fb9cbb1 YK	153	/* Ordinarily, we'd expect the inverted tupleproto, but it's
9fb9cbb1 YK	154	been preserved inside the ICMP. */
d1b6fe94	155	if (!nf_ct_invert_tuple(&intuple, &origtuple, inproto)) {
0d53778e	156	pr_debug("icmpv6_error: Can't invert tuple\n");
9fb9cbb1 YK	157	return -NF_ACCEPT;
	158	}
	159
11df4b76	160	ctinfo = IP_CT_RELATED;
9fb9cbb1	161
5e8018fc DB	162	h = nf_conntrack_find_get(net, nf_ct_zone_tmpl(tmpl, skb, &tmp),
5e8018fc DB	163	&intuple);
9fb9cbb1	164	if (!h) {
0d53778e	165	pr_debug("icmpv6_error: no match\n");
9fb9cbb1 YK	166	return -NF_ACCEPT;
	167	} else {
	168	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
11df4b76	169	ctinfo += IP_CT_IS_REPLY;
9fb9cbb1 YK	170	}
	171
	172	/* Update skb to refer to this connection */
c74454fa	173	nf_ct_set(skb, nf_ct_tuplehash_to_ctrack(h), ctinfo);
88ed01d1	174	return NF_ACCEPT;
9fb9cbb1 YK	175	}
9fb9cbb1 YK	176
c4f3db15 FW	177	static void icmpv6_error_log(const struct sk_buff skb, struct net net,
	178	u8 pf, const char *msg)
	179	{
	180	nf_l4proto_log_invalid(skb, net, pf, IPPROTO_ICMPV6, "%s", msg);
	181	}
	182
9fb9cbb1	183	static int
8fea97ec PM	184	icmpv6_error(struct net net, struct nf_conn tmpl,
8fea97ec PM	185	struct sk_buff *skb, unsigned int dataoff,
11df4b76	186	u8 pf, unsigned int hooknum)
9fb9cbb1	187	{
7cc3864d JE	188	const struct icmp6hdr *icmp6h;
7cc3864d JE	189	struct icmp6hdr _ih;
3f900713	190	int type;
9fb9cbb1 YK	191
	192	icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
	193	if (icmp6h == NULL) {
c4f3db15	194	icmpv6_error_log(skb, net, pf, "short packet");
9fb9cbb1 YK	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)) {
c4f3db15	200	icmpv6_error_log(skb, net, pf, "ICMPv6 checksum failed");
9fb9cbb1 YK	201	return -NF_ACCEPT;
	202	}
	203
3f900713 EL	204	type = icmp6h->icmp6_type - 130;
	205	if (type >= 0 && type < sizeof(noct_valid_new) &&
	206	noct_valid_new[type]) {
cc41c84b	207	nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
3f900713 EL	208	return NF_ACCEPT;
	209	}
	210
9fb9cbb1 YK	211	/* is not error message ? */
	212	if (icmp6h->icmp6_type >= 128)
	213	return NF_ACCEPT;
	214
d1c1e39d	215	return icmpv6_error_message(net, tmpl, skb, dataoff);
9fb9cbb1 YK	216	}
9fb9cbb1 YK	217
07a93626	218	#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
c1d10adb PNA	219
	220	#include <linux/netfilter/nfnetlink.h>
	221	#include <linux/netfilter/nfnetlink_conntrack.h>
fdf70832	222	static int icmpv6_tuple_to_nlattr(struct sk_buff *skb,
c1d10adb PNA	223	const struct nf_conntrack_tuple *t)
c1d10adb PNA	224	{
e549a6b3 DM	225	if (nla_put_be16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id) \|\|
	226	nla_put_u8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type) \|\|
	227	nla_put_u8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code))
	228	goto nla_put_failure;
c1d10adb PNA	229	return 0;
c1d10adb PNA	230
df6fb868	231	nla_put_failure:
c1d10adb PNA	232	return -1;
	233	}
	234
f73e924c PM	235	static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = {
	236	[CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 },
	237	[CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 },
	238	[CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 },
c1d10adb PNA	239	};
c1d10adb PNA	240
fdf70832	241	static int icmpv6_nlattr_to_tuple(struct nlattr *tb[],
c1d10adb PNA	242	struct nf_conntrack_tuple *tuple)
c1d10adb PNA	243	{
3666ed1c JP	244	if (!tb[CTA_PROTO_ICMPV6_TYPE] \|\|
	245	!tb[CTA_PROTO_ICMPV6_CODE] \|\|
	246	!tb[CTA_PROTO_ICMPV6_ID])
c1d10adb PNA	247	return -EINVAL;
c1d10adb PNA	248
77236b6e PM	249	tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]);
	250	tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]);
	251	tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]);
c1d10adb	252
3666ed1c JP	253	if (tuple->dst.u.icmp.type < 128 \|\|
	254	tuple->dst.u.icmp.type - 128 >= sizeof(invmap) \|\|
	255	!invmap[tuple->dst.u.icmp.type - 128])
c1d10adb PNA	256	return -EINVAL;
	257
	258	return 0;
	259	}
a400c30e	260
5caaed15	261	static unsigned int icmpv6_nlattr_tuple_size(void)
a400c30e	262	{
5caaed15 FW	263	static unsigned int size __read_mostly;
	264
	265	if (!size)
	266	size = nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1);
	267
	268	return size;
a400c30e	269	}
c1d10adb PNA	270	#endif
c1d10adb PNA	271
50978462 PNA	272	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
	273
	274	#include <linux/netfilter/nfnetlink.h>
	275	#include <linux/netfilter/nfnetlink_cttimeout.h>
	276
8264deb8 G	277	static int icmpv6_timeout_nlattr_to_obj(struct nlattr *tb[],
8264deb8 G	278	struct net net, void data)
50978462 PNA	279	{
50978462 PNA	280	unsigned int *timeout = data;
8264deb8	281	struct nf_icmp_net *in = icmpv6_pernet(net);
50978462 PNA	282
	283	if (tb[CTA_TIMEOUT_ICMPV6_TIMEOUT]) {
	284	*timeout =
	285	ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMPV6_TIMEOUT])) * HZ;
	286	} else {
	287	/* Set default ICMPv6 timeout. */
8264deb8	288	*timeout = in->timeout;
50978462 PNA	289	}
	290	return 0;
	291	}
	292
	293	static int
	294	icmpv6_timeout_obj_to_nlattr(struct sk_buff skb, const void data)
	295	{
	296	const unsigned int *timeout = data;
	297
e549a6b3 DM	298	if (nla_put_be32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ)))
e549a6b3 DM	299	goto nla_put_failure;
50978462 PNA	300	return 0;
	301
	302	nla_put_failure:
	303	return -ENOSPC;
	304	}
	305
	306	static const struct nla_policy
	307	icmpv6_timeout_nla_policy[CTA_TIMEOUT_ICMPV6_MAX+1] = {
	308	[CTA_TIMEOUT_ICMPV6_TIMEOUT] = { .type = NLA_U32 },
	309	};
	310	#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
	311
933a41e7	312	#ifdef CONFIG_SYSCTL
933a41e7 PM	313	static struct ctl_table icmpv6_sysctl_table[] = {
933a41e7 PM	314	{
933a41e7	315	.procname = "nf_conntrack_icmpv6_timeout",
933a41e7 PM	316	.maxlen = sizeof(unsigned int),
933a41e7 PM	317	.mode = 0644,
6d9f239a	318	.proc_handler = proc_dointvec_jiffies,
933a41e7	319	},
f8572d8f	320	{ }
933a41e7 PM	321	};
	322	#endif /* CONFIG_SYSCTL */
	323
8fc02781 G	324	static int icmpv6_kmemdup_sysctl_table(struct nf_proto_net *pn,
8fc02781 G	325	struct nf_icmp_net *in)
7080ba09	326	{
7080ba09 G	327	#ifdef CONFIG_SYSCTL
	328	pn->ctl_table = kmemdup(icmpv6_sysctl_table,
	329	sizeof(icmpv6_sysctl_table),
	330	GFP_KERNEL);
	331	if (!pn->ctl_table)
	332	return -ENOMEM;
8fc02781	333
7080ba09 G	334	pn->ctl_table[0].data = &in->timeout;
	335	#endif
	336	return 0;
	337	}
	338
8fc02781 G	339	static int icmpv6_init_net(struct net *net, u_int16_t proto)
	340	{
	341	struct nf_icmp_net *in = icmpv6_pernet(net);
	342	struct nf_proto_net *pn = &in->pn;
	343
	344	in->timeout = nf_ct_icmpv6_timeout;
	345
	346	return icmpv6_kmemdup_sysctl_table(pn, in);
	347	}
	348
08911475 PNA	349	static struct nf_proto_net icmpv6_get_net_proto(struct net net)
	350	{
	351	return &net->ct.nf_ct_proto.icmpv6.pn;
	352	}
	353
9dae47ab	354	const struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 =
9fb9cbb1 YK	355	{
9fb9cbb1 YK	356	.l3proto = PF_INET6,
605dcad6	357	.l4proto = IPPROTO_ICMPV6,
9fb9cbb1 YK	358	.pkt_to_tuple = icmpv6_pkt_to_tuple,
9fb9cbb1 YK	359	.invert_tuple = icmpv6_invert_tuple,
9fb9cbb1	360	.packet = icmpv6_packet,
2c8503f5	361	.get_timeouts = icmpv6_get_timeouts,
9fb9cbb1 YK	362	.new = icmpv6_new,
9fb9cbb1 YK	363	.error = icmpv6_error,
07a93626	364	#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
fdf70832	365	.tuple_to_nlattr = icmpv6_tuple_to_nlattr,
a400c30e	366	.nlattr_tuple_size = icmpv6_nlattr_tuple_size,
fdf70832	367	.nlattr_to_tuple = icmpv6_nlattr_to_tuple,
f73e924c	368	.nla_policy = icmpv6_nla_policy,
c1d10adb	369	#endif
50978462 PNA	370	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
	371	.ctnl_timeout = {
	372	.nlattr_to_obj = icmpv6_timeout_nlattr_to_obj,
	373	.obj_to_nlattr = icmpv6_timeout_obj_to_nlattr,
	374	.nlattr_max = CTA_TIMEOUT_ICMP_MAX,
	375	.obj_size = sizeof(unsigned int),
	376	.nla_policy = icmpv6_timeout_nla_policy,
	377	},
	378	#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
7080ba09	379	.init_net = icmpv6_init_net,
08911475	380	.get_net_proto = icmpv6_get_net_proto,
9fb9cbb1	381	};