[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 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 void icmpv6_print_tuple(struct seq_file *s,
			      const struct nf_conntrack_tuple *tuple)
{
	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));
}

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 hooknum,
		       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);
		if (LOG_INVALID(nf_ct_net(ct), IPPROTO_ICMPV6))
			nf_log_packet(nf_ct_net(ct), 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 nf_conn *tmpl,
		     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;
	struct nf_conntrack_zone tmp;

	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, 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 */
	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(net, 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(net, 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_ct_untracked_get()->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, tmpl, skb, dataoff, ctinfo, hooknum);
}

#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,
	.name			= "icmpv6",
	.pkt_to_tuple		= icmpv6_pkt_to_tuple,
	.invert_tuple		= icmpv6_invert_tuple,
	.print_tuple		= icmpv6_print_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,
	38	unsigned int dataoff,
	39	struct nf_conntrack_tuple *tuple)
9fb9cbb1	40	{
7cc3864d JE	41	const struct icmp6hdr *hp;
7cc3864d JE	42	struct icmp6hdr _hdr;
9fb9cbb1 YK	43
	44	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
	45	if (hp == NULL)
09f263cd	46	return false;
9fb9cbb1 YK	47	tuple->dst.u.icmp.type = hp->icmp6_type;
	48	tuple->src.u.icmp.id = hp->icmp6_identifier;
	49	tuple->dst.u.icmp.code = hp->icmp6_code;
	50
09f263cd	51	return true;
9fb9cbb1 YK	52	}
9fb9cbb1 YK	53
c1d10adb	54	/* Add 1; spaces filled with 0. */
7cc3864d	55	static const u_int8_t invmap[] = {
c1d10adb PNA	56	[ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1,
c1d10adb PNA	57	[ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1,
a51f42f3 EL	58	[ICMPV6_NI_QUERY - 128] = ICMPV6_NI_REPLY + 1,
a51f42f3 EL	59	[ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY +1
c1d10adb PNA	60	};
c1d10adb PNA	61
3f900713 EL	62	static const u_int8_t noct_valid_new[] = {
	63	[ICMPV6_MGM_QUERY - 130] = 1,
	64	[ICMPV6_MGM_REPORT -130] = 1,
	65	[ICMPV6_MGM_REDUCTION - 130] = 1,
	66	[NDISC_ROUTER_SOLICITATION - 130] = 1,
	67	[NDISC_ROUTER_ADVERTISEMENT - 130] = 1,
	68	[NDISC_NEIGHBOUR_SOLICITATION - 130] = 1,
	69	[NDISC_NEIGHBOUR_ADVERTISEMENT - 130] = 1,
	70	[ICMPV6_MLD2_REPORT - 130] = 1
	71	};
	72
09f263cd JE	73	static bool icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
09f263cd JE	74	const struct nf_conntrack_tuple *orig)
9fb9cbb1	75	{
f16c9107 YK	76	int type = orig->dst.u.icmp.type - 128;
f16c9107 YK	77	if (type < 0 \|\| type >= sizeof(invmap) \|\| !invmap[type])
09f263cd	78	return false;
9fb9cbb1 YK	79
	80	tuple->src.u.icmp.id = orig->src.u.icmp.id;
	81	tuple->dst.u.icmp.type = invmap[type] - 1;
	82	tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
09f263cd	83	return true;
9fb9cbb1 YK	84	}
	85
	86	/* Print out the per-protocol part of the tuple. */
824f1fbe	87	static void icmpv6_print_tuple(struct seq_file *s,
9fb9cbb1 YK	88	const struct nf_conntrack_tuple *tuple)
9fb9cbb1 YK	89	{
824f1fbe JP	90	seq_printf(s, "type=%u code=%u id=%u ",
	91	tuple->dst.u.icmp.type,
	92	tuple->dst.u.icmp.code,
	93	ntohs(tuple->src.u.icmp.id));
9fb9cbb1 YK	94	}
9fb9cbb1 YK	95
2c8503f5 PNA	96	static unsigned int icmpv6_get_timeouts(struct net net)
2c8503f5 PNA	97	{
7080ba09	98	return &icmpv6_pernet(net)->timeout;
2c8503f5 PNA	99	}
2c8503f5 PNA	100
9fb9cbb1 YK	101	/* Returns verdict for packet, or -1 for invalid. */
	102	static int icmpv6_packet(struct nf_conn *ct,
	103	const struct sk_buff *skb,
	104	unsigned int dataoff,
	105	enum ip_conntrack_info ctinfo,
76108cea	106	u_int8_t pf,
2c8503f5 PNA	107	unsigned int hooknum,
2c8503f5 PNA	108	unsigned int *timeout)
9fb9cbb1	109	{
f87fb666 JK	110	/* Do not immediately delete the connection after the first
	111	successful reply to avoid excessive conntrackd traffic
	112	and also to handle correctly ICMP echo reply duplicates. */
2c8503f5	113	nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
9fb9cbb1 YK	114
	115	return NF_ACCEPT;
	116	}
	117
	118	/* Called when a new connection for this protocol found. */
09f263cd	119	static bool icmpv6_new(struct nf_conn ct, const struct sk_buff skb,
2c8503f5	120	unsigned int dataoff, unsigned int *timeouts)
9fb9cbb1	121	{
7cc3864d	122	static const u_int8_t valid_new[] = {
9fb9cbb1 YK	123	[ICMPV6_ECHO_REQUEST - 128] = 1,
	124	[ICMPV6_NI_QUERY - 128] = 1
	125	};
c88130bc	126	int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128;
9fb9cbb1	127
f16c9107	128	if (type < 0 \|\| type >= sizeof(valid_new) \|\| !valid_new[type]) {
9fb9cbb1	129	/* Can't create a new ICMPv6 `conn' with this. */
0d53778e PM	130	pr_debug("icmpv6: can't create new conn with type %u\n",
0d53778e PM	131	type + 128);
3c9fba65	132	nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple);
55df4ac0	133	if (LOG_INVALID(nf_ct_net(ct), IPPROTO_ICMPV6))
30e0c6a6 G	134	nf_log_packet(nf_ct_net(ct), PF_INET6, 0, skb, NULL,
30e0c6a6 G	135	NULL, NULL,
55df4ac0 EL	136	"nf_ct_icmpv6: invalid new with type %d ",
55df4ac0 EL	137	type + 128);
09f263cd	138	return false;
9fb9cbb1	139	}
09f263cd	140	return true;
9fb9cbb1 YK	141	}
9fb9cbb1 YK	142
9fb9cbb1	143	static int
5d0aa2cc	144	icmpv6_error_message(struct net net, struct nf_conn tmpl,
74c51a14	145	struct sk_buff *skb,
9fb9cbb1 YK	146	unsigned int icmp6off,
	147	enum ip_conntrack_info *ctinfo,
	148	unsigned int hooknum)
	149	{
	150	struct nf_conntrack_tuple intuple, origtuple;
7cc3864d JE	151	const struct nf_conntrack_tuple_hash *h;
7cc3864d JE	152	const struct nf_conntrack_l4proto *inproto;
5e8018fc	153	struct nf_conntrack_zone tmp;
9fb9cbb1 YK	154
	155	NF_CT_ASSERT(skb->nfct == NULL);
	156
9fb9cbb1	157	/* Are they talking about one of our connections? */
e2a3123f YK	158	if (!nf_ct_get_tuplepr(skb,
	159	skb_network_offset(skb)
	160	+ sizeof(struct ipv6hdr)
	161	+ sizeof(struct icmp6hdr),
	162	PF_INET6, &origtuple)) {
0d53778e	163	pr_debug("icmpv6_error: Can't get tuple\n");
9fb9cbb1 YK	164	return -NF_ACCEPT;
	165	}
	166
e2a3123f YK	167	/* rcu_read_lock()ed by nf_hook_slow */
	168	inproto = __nf_ct_l4proto_find(PF_INET6, origtuple.dst.protonum);
	169
9fb9cbb1 YK	170	/* Ordinarily, we'd expect the inverted tupleproto, but it's
	171	been preserved inside the ICMP. */
	172	if (!nf_ct_invert_tuple(&intuple, &origtuple,
	173	&nf_conntrack_l3proto_ipv6, inproto)) {
0d53778e	174	pr_debug("icmpv6_error: Can't invert tuple\n");
9fb9cbb1 YK	175	return -NF_ACCEPT;
	176	}
	177
	178	*ctinfo = IP_CT_RELATED;
	179
5e8018fc DB	180	h = nf_conntrack_find_get(net, nf_ct_zone_tmpl(tmpl, skb, &tmp),
5e8018fc DB	181	&intuple);
9fb9cbb1	182	if (!h) {
0d53778e	183	pr_debug("icmpv6_error: no match\n");
9fb9cbb1 YK	184	return -NF_ACCEPT;
	185	} else {
	186	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
	187	*ctinfo += IP_CT_IS_REPLY;
	188	}
	189
	190	/* Update skb to refer to this connection */
	191	skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
	192	skb->nfctinfo = *ctinfo;
88ed01d1	193	return NF_ACCEPT;
9fb9cbb1 YK	194	}
	195
	196	static int
8fea97ec PM	197	icmpv6_error(struct net net, struct nf_conn tmpl,
8fea97ec PM	198	struct sk_buff *skb, unsigned int dataoff,
76108cea	199	enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum)
9fb9cbb1	200	{
7cc3864d JE	201	const struct icmp6hdr *icmp6h;
7cc3864d JE	202	struct icmp6hdr _ih;
3f900713	203	int type;
9fb9cbb1 YK	204
	205	icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
	206	if (icmp6h == NULL) {
c2a2c7e0	207	if (LOG_INVALID(net, IPPROTO_ICMPV6))
30e0c6a6	208	nf_log_packet(net, PF_INET6, 0, skb, NULL, NULL, NULL,
9fb9cbb1 YK	209	"nf_ct_icmpv6: short packet ");
	210	return -NF_ACCEPT;
	211	}
	212
c04d0552	213	if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
96f6bf82	214	nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
4aa3b2ee	215	if (LOG_INVALID(net, IPPROTO_ICMPV6))
30e0c6a6	216	nf_log_packet(net, PF_INET6, 0, skb, NULL, NULL, NULL,
4aa3b2ee	217	"nf_ct_icmpv6: ICMPv6 checksum failed ");
9fb9cbb1 YK	218	return -NF_ACCEPT;
	219	}
	220
3f900713 EL	221	type = icmp6h->icmp6_type - 130;
	222	if (type >= 0 && type < sizeof(noct_valid_new) &&
	223	noct_valid_new[type]) {
5bfddbd4	224	skb->nfct = &nf_ct_untracked_get()->ct_general;
3f900713 EL	225	skb->nfctinfo = IP_CT_NEW;
	226	nf_conntrack_get(skb->nfct);
	227	return NF_ACCEPT;
	228	}
	229
9fb9cbb1 YK	230	/* is not error message ? */
	231	if (icmp6h->icmp6_type >= 128)
	232	return NF_ACCEPT;
	233
5d0aa2cc	234	return icmpv6_error_message(net, tmpl, skb, dataoff, ctinfo, hooknum);
9fb9cbb1 YK	235	}
9fb9cbb1 YK	236
07a93626	237	#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
c1d10adb PNA	238
	239	#include <linux/netfilter/nfnetlink.h>
	240	#include <linux/netfilter/nfnetlink_conntrack.h>
fdf70832	241	static int icmpv6_tuple_to_nlattr(struct sk_buff *skb,
c1d10adb PNA	242	const struct nf_conntrack_tuple *t)
c1d10adb PNA	243	{
e549a6b3 DM	244	if (nla_put_be16(skb, CTA_PROTO_ICMPV6_ID, t->src.u.icmp.id) \|\|
	245	nla_put_u8(skb, CTA_PROTO_ICMPV6_TYPE, t->dst.u.icmp.type) \|\|
	246	nla_put_u8(skb, CTA_PROTO_ICMPV6_CODE, t->dst.u.icmp.code))
	247	goto nla_put_failure;
c1d10adb PNA	248	return 0;
c1d10adb PNA	249
df6fb868	250	nla_put_failure:
c1d10adb PNA	251	return -1;
	252	}
	253
f73e924c PM	254	static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = {
	255	[CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 },
	256	[CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 },
	257	[CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 },
c1d10adb PNA	258	};
c1d10adb PNA	259
fdf70832	260	static int icmpv6_nlattr_to_tuple(struct nlattr *tb[],
c1d10adb PNA	261	struct nf_conntrack_tuple *tuple)
c1d10adb PNA	262	{
3666ed1c JP	263	if (!tb[CTA_PROTO_ICMPV6_TYPE] \|\|
	264	!tb[CTA_PROTO_ICMPV6_CODE] \|\|
	265	!tb[CTA_PROTO_ICMPV6_ID])
c1d10adb PNA	266	return -EINVAL;
c1d10adb PNA	267
77236b6e PM	268	tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]);
	269	tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]);
	270	tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]);
c1d10adb	271
3666ed1c JP	272	if (tuple->dst.u.icmp.type < 128 \|\|
	273	tuple->dst.u.icmp.type - 128 >= sizeof(invmap) \|\|
	274	!invmap[tuple->dst.u.icmp.type - 128])
c1d10adb PNA	275	return -EINVAL;
	276
	277	return 0;
	278	}
a400c30e HE	279
	280	static int icmpv6_nlattr_tuple_size(void)
	281	{
	282	return nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1);
	283	}
c1d10adb PNA	284	#endif
c1d10adb PNA	285
50978462 PNA	286	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
	287
	288	#include <linux/netfilter/nfnetlink.h>
	289	#include <linux/netfilter/nfnetlink_cttimeout.h>
	290
8264deb8 G	291	static int icmpv6_timeout_nlattr_to_obj(struct nlattr *tb[],
8264deb8 G	292	struct net net, void data)
50978462 PNA	293	{
50978462 PNA	294	unsigned int *timeout = data;
8264deb8	295	struct nf_icmp_net *in = icmpv6_pernet(net);
50978462 PNA	296
	297	if (tb[CTA_TIMEOUT_ICMPV6_TIMEOUT]) {
	298	*timeout =
	299	ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMPV6_TIMEOUT])) * HZ;
	300	} else {
	301	/* Set default ICMPv6 timeout. */
8264deb8	302	*timeout = in->timeout;
50978462 PNA	303	}
	304	return 0;
	305	}
	306
	307	static int
	308	icmpv6_timeout_obj_to_nlattr(struct sk_buff skb, const void data)
	309	{
	310	const unsigned int *timeout = data;
	311
e549a6b3 DM	312	if (nla_put_be32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ)))
e549a6b3 DM	313	goto nla_put_failure;
50978462 PNA	314	return 0;
	315
	316	nla_put_failure:
	317	return -ENOSPC;
	318	}
	319
	320	static const struct nla_policy
	321	icmpv6_timeout_nla_policy[CTA_TIMEOUT_ICMPV6_MAX+1] = {
	322	[CTA_TIMEOUT_ICMPV6_TIMEOUT] = { .type = NLA_U32 },
	323	};
	324	#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
	325
933a41e7	326	#ifdef CONFIG_SYSCTL
933a41e7 PM	327	static struct ctl_table icmpv6_sysctl_table[] = {
933a41e7 PM	328	{
933a41e7	329	.procname = "nf_conntrack_icmpv6_timeout",
933a41e7 PM	330	.maxlen = sizeof(unsigned int),
933a41e7 PM	331	.mode = 0644,
6d9f239a	332	.proc_handler = proc_dointvec_jiffies,
933a41e7	333	},
f8572d8f	334	{ }
933a41e7 PM	335	};
	336	#endif /* CONFIG_SYSCTL */
	337
8fc02781 G	338	static int icmpv6_kmemdup_sysctl_table(struct nf_proto_net *pn,
8fc02781 G	339	struct nf_icmp_net *in)
7080ba09	340	{
7080ba09 G	341	#ifdef CONFIG_SYSCTL
	342	pn->ctl_table = kmemdup(icmpv6_sysctl_table,
	343	sizeof(icmpv6_sysctl_table),
	344	GFP_KERNEL);
	345	if (!pn->ctl_table)
	346	return -ENOMEM;
8fc02781	347
7080ba09 G	348	pn->ctl_table[0].data = &in->timeout;
	349	#endif
	350	return 0;
	351	}
	352
8fc02781 G	353	static int icmpv6_init_net(struct net *net, u_int16_t proto)
	354	{
	355	struct nf_icmp_net *in = icmpv6_pernet(net);
	356	struct nf_proto_net *pn = &in->pn;
	357
	358	in->timeout = nf_ct_icmpv6_timeout;
	359
	360	return icmpv6_kmemdup_sysctl_table(pn, in);
	361	}
	362
08911475 PNA	363	static struct nf_proto_net icmpv6_get_net_proto(struct net net)
	364	{
	365	return &net->ct.nf_ct_proto.icmpv6.pn;
	366	}
	367
61075af5	368	struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly =
9fb9cbb1 YK	369	{
9fb9cbb1 YK	370	.l3proto = PF_INET6,
605dcad6	371	.l4proto = IPPROTO_ICMPV6,
9fb9cbb1 YK	372	.name = "icmpv6",
	373	.pkt_to_tuple = icmpv6_pkt_to_tuple,
	374	.invert_tuple = icmpv6_invert_tuple,
	375	.print_tuple = icmpv6_print_tuple,
9fb9cbb1	376	.packet = icmpv6_packet,
2c8503f5	377	.get_timeouts = icmpv6_get_timeouts,
9fb9cbb1 YK	378	.new = icmpv6_new,
9fb9cbb1 YK	379	.error = icmpv6_error,
07a93626	380	#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
fdf70832	381	.tuple_to_nlattr = icmpv6_tuple_to_nlattr,
a400c30e	382	.nlattr_tuple_size = icmpv6_nlattr_tuple_size,
fdf70832	383	.nlattr_to_tuple = icmpv6_nlattr_to_tuple,
f73e924c	384	.nla_policy = icmpv6_nla_policy,
c1d10adb	385	#endif
50978462 PNA	386	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
	387	.ctnl_timeout = {
	388	.nlattr_to_obj = icmpv6_timeout_nlattr_to_obj,
	389	.obj_to_nlattr = icmpv6_timeout_obj_to_nlattr,
	390	.nlattr_max = CTA_TIMEOUT_ICMP_MAX,
	391	.obj_size = sizeof(unsigned int),
	392	.nla_policy = icmpv6_timeout_nla_policy,
	393	},
	394	#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
7080ba09	395	.init_net = icmpv6_init_net,
08911475	396	.get_net_proto = icmpv6_get_net_proto,
9fb9cbb1	397	};