[mirror_ubuntu-artful-kernel.git] / net / ipv6 / netfilter / nf_conntrack_l3proto_ipv6.c

/*
 * Copyright (C)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/ipv6.h>
#include <linux/in6.h>
#include <linux/netfilter.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/icmp.h>
#include <net/ipv6.h>
#include <net/inet_frag.h>

#include <linux/netfilter_bridge.h>
#include <linux/netfilter_ipv6.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
#include <net/netfilter/nf_log.h>

static bool ipv6_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff,
			      struct nf_conntrack_tuple *tuple)
{
	const u_int32_t *ap;
	u_int32_t _addrs[8];

	ap = skb_header_pointer(skb, nhoff + offsetof(struct ipv6hdr, saddr),
				sizeof(_addrs), _addrs);
	if (ap == NULL)
		return false;

	memcpy(tuple->src.u3.ip6, ap, sizeof(tuple->src.u3.ip6));
	memcpy(tuple->dst.u3.ip6, ap + 4, sizeof(tuple->dst.u3.ip6));

	return true;
}

static bool ipv6_invert_tuple(struct nf_conntrack_tuple *tuple,
			      const struct nf_conntrack_tuple *orig)
{
	memcpy(tuple->src.u3.ip6, orig->dst.u3.ip6, sizeof(tuple->src.u3.ip6));
	memcpy(tuple->dst.u3.ip6, orig->src.u3.ip6, sizeof(tuple->dst.u3.ip6));

	return true;
}

static int ipv6_print_tuple(struct seq_file *s,
			    const struct nf_conntrack_tuple *tuple)
{
	return seq_printf(s, "src=%pI6 dst=%pI6 ",
			  tuple->src.u3.ip6, tuple->dst.u3.ip6);
}

/*
 * Based on ipv6_skip_exthdr() in net/ipv6/exthdr.c
 *
 * This function parses (probably truncated) exthdr set "hdr"
 * of length "len". "nexthdrp" initially points to some place,
 * where type of the first header can be found.
 *
 * It skips all well-known exthdrs, and returns pointer to the start
 * of unparsable area i.e. the first header with unknown type.
 * if success, *nexthdr is updated by type/protocol of this header.
 *
 * NOTES: - it may return pointer pointing beyond end of packet,
 *          if the last recognized header is truncated in the middle.
 *        - if packet is truncated, so that all parsed headers are skipped,
 *          it returns -1.
 *        - if packet is fragmented, return pointer of the fragment header.
 *        - ESP is unparsable for now and considered like
 *          normal payload protocol.
 *        - Note also special handling of AUTH header. Thanks to IPsec wizards.
 */

static int nf_ct_ipv6_skip_exthdr(const struct sk_buff *skb, int start,
				  u8 *nexthdrp, int len)
{
	u8 nexthdr = *nexthdrp;

	while (ipv6_ext_hdr(nexthdr)) {
		struct ipv6_opt_hdr hdr;
		int hdrlen;

		if (len < (int)sizeof(struct ipv6_opt_hdr))
			return -1;
		if (nexthdr == NEXTHDR_NONE)
			break;
		if (nexthdr == NEXTHDR_FRAGMENT)
			break;
		if (skb_copy_bits(skb, start, &hdr, sizeof(hdr)))
			BUG();
		if (nexthdr == NEXTHDR_AUTH)
			hdrlen = (hdr.hdrlen+2)<<2;
		else
			hdrlen = ipv6_optlen(&hdr);

		nexthdr = hdr.nexthdr;
		len -= hdrlen;
		start += hdrlen;
	}

	*nexthdrp = nexthdr;
	return start;
}

static int ipv6_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
			    unsigned int *dataoff, u_int8_t *protonum)
{
	unsigned int extoff = nhoff + sizeof(struct ipv6hdr);
	unsigned char pnum;
	int protoff;

	if (skb_copy_bits(skb, nhoff + offsetof(struct ipv6hdr, nexthdr),
			  &pnum, sizeof(pnum)) != 0) {
		pr_debug("ip6_conntrack_core: can't get nexthdr\n");
		return -NF_ACCEPT;
	}
	protoff = nf_ct_ipv6_skip_exthdr(skb, extoff, &pnum, skb->len - extoff);
	/*
	 * (protoff == skb->len) mean that the packet doesn't have no data
	 * except of IPv6 & ext headers. but it's tracked anyway. - YK
	 */
	if ((protoff < 0) || (protoff > skb->len)) {
		pr_debug("ip6_conntrack_core: can't find proto in pkt\n");
		return -NF_ACCEPT;
	}

	*dataoff = protoff;
	*protonum = pnum;
	return NF_ACCEPT;
}

static unsigned int ipv6_confirm(unsigned int hooknum,
				 struct sk_buff *skb,
				 const struct net_device *in,
				 const struct net_device *out,
				 int (*okfn)(struct sk_buff *))
{
	struct nf_conn *ct;
	const struct nf_conn_help *help;
	const struct nf_conntrack_helper *helper;
	enum ip_conntrack_info ctinfo;
	unsigned int ret, protoff;
	unsigned int extoff = (u8 *)(ipv6_hdr(skb) + 1) - skb->data;
	unsigned char pnum = ipv6_hdr(skb)->nexthdr;


	/* This is where we call the helper: as the packet goes out. */
	ct = nf_ct_get(skb, &ctinfo);
	if (!ct || ctinfo == IP_CT_RELATED_REPLY)
		goto out;

	help = nfct_help(ct);
	if (!help)
		goto out;
	/* rcu_read_lock()ed by nf_hook_slow */
	helper = rcu_dereference(help->helper);
	if (!helper)
		goto out;

	protoff = nf_ct_ipv6_skip_exthdr(skb, extoff, &pnum,
					 skb->len - extoff);
	if (protoff > skb->len || pnum == NEXTHDR_FRAGMENT) {
		pr_debug("proto header not found\n");
		return NF_ACCEPT;
	}

	ret = helper->help(skb, protoff, ct, ctinfo);
	if (ret != NF_ACCEPT) {
		nf_log_packet(NFPROTO_IPV6, hooknum, skb, in, out, NULL,
			      "nf_ct_%s: dropping packet", helper->name);
		return ret;
	}
out:
	/* We've seen it coming out the other side: confirm it */
	return nf_conntrack_confirm(skb);
}

static unsigned int __ipv6_conntrack_in(struct net *net,
					unsigned int hooknum,
					struct sk_buff *skb,
					int (*okfn)(struct sk_buff *))
{
	struct sk_buff *reasm = skb->nfct_reasm;

	/* This packet is fragmented and has reassembled packet. */
	if (reasm) {
		/* Reassembled packet isn't parsed yet ? */
		if (!reasm->nfct) {
			unsigned int ret;

			ret = nf_conntrack_in(net, PF_INET6, hooknum, reasm);
			if (ret != NF_ACCEPT)
				return ret;
		}
		nf_conntrack_get(reasm->nfct);
		skb->nfct = reasm->nfct;
		skb->nfctinfo = reasm->nfctinfo;
		return NF_ACCEPT;
	}

	return nf_conntrack_in(net, PF_INET6, hooknum, skb);
}

static unsigned int ipv6_conntrack_in(unsigned int hooknum,
				      struct sk_buff *skb,
				      const struct net_device *in,
				      const struct net_device *out,
				      int (*okfn)(struct sk_buff *))
{
	return __ipv6_conntrack_in(dev_net(in), hooknum, skb, okfn);
}

static unsigned int ipv6_conntrack_local(unsigned int hooknum,
					 struct sk_buff *skb,
					 const struct net_device *in,
					 const struct net_device *out,
					 int (*okfn)(struct sk_buff *))
{
	/* root is playing with raw sockets. */
	if (skb->len < sizeof(struct ipv6hdr)) {
		net_notice_ratelimited("ipv6_conntrack_local: packet too short\n");
		return NF_ACCEPT;
	}
	return __ipv6_conntrack_in(dev_net(out), hooknum, skb, okfn);
}

static struct nf_hook_ops ipv6_conntrack_ops[] __read_mostly = {
	{
		.hook		= ipv6_conntrack_in,
		.owner		= THIS_MODULE,
		.pf		= NFPROTO_IPV6,
		.hooknum	= NF_INET_PRE_ROUTING,
		.priority	= NF_IP6_PRI_CONNTRACK,
	},
	{
		.hook		= ipv6_conntrack_local,
		.owner		= THIS_MODULE,
		.pf		= NFPROTO_IPV6,
		.hooknum	= NF_INET_LOCAL_OUT,
		.priority	= NF_IP6_PRI_CONNTRACK,
	},
	{
		.hook		= ipv6_confirm,
		.owner		= THIS_MODULE,
		.pf		= NFPROTO_IPV6,
		.hooknum	= NF_INET_POST_ROUTING,
		.priority	= NF_IP6_PRI_LAST,
	},
	{
		.hook		= ipv6_confirm,
		.owner		= THIS_MODULE,
		.pf		= NFPROTO_IPV6,
		.hooknum	= NF_INET_LOCAL_IN,
		.priority	= NF_IP6_PRI_LAST-1,
	},
};

#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 ipv6_tuple_to_nlattr(struct sk_buff *skb,
				const struct nf_conntrack_tuple *tuple)
{
	if (nla_put(skb, CTA_IP_V6_SRC, sizeof(u_int32_t) * 4,
		    &tuple->src.u3.ip6) ||
	    nla_put(skb, CTA_IP_V6_DST, sizeof(u_int32_t) * 4,
		    &tuple->dst.u3.ip6))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -1;
}

static const struct nla_policy ipv6_nla_policy[CTA_IP_MAX+1] = {
	[CTA_IP_V6_SRC]	= { .len = sizeof(u_int32_t)*4 },
	[CTA_IP_V6_DST]	= { .len = sizeof(u_int32_t)*4 },
};

static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
				struct nf_conntrack_tuple *t)
{
	if (!tb[CTA_IP_V6_SRC] || !tb[CTA_IP_V6_DST])
		return -EINVAL;

	memcpy(&t->src.u3.ip6, nla_data(tb[CTA_IP_V6_SRC]),
	       sizeof(u_int32_t) * 4);
	memcpy(&t->dst.u3.ip6, nla_data(tb[CTA_IP_V6_DST]),
	       sizeof(u_int32_t) * 4);

	return 0;
}

static int ipv6_nlattr_tuple_size(void)
{
	return nla_policy_len(ipv6_nla_policy, CTA_IP_MAX + 1);
}
#endif

struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6 __read_mostly = {
	.l3proto		= PF_INET6,
	.name			= "ipv6",
	.pkt_to_tuple		= ipv6_pkt_to_tuple,
	.invert_tuple		= ipv6_invert_tuple,
	.print_tuple		= ipv6_print_tuple,
	.get_l4proto		= ipv6_get_l4proto,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
	.tuple_to_nlattr	= ipv6_tuple_to_nlattr,
	.nlattr_tuple_size	= ipv6_nlattr_tuple_size,
	.nlattr_to_tuple	= ipv6_nlattr_to_tuple,
	.nla_policy		= ipv6_nla_policy,
#endif
	.me			= THIS_MODULE,
};

MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET6));
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Yasuyuki KOZAKAI @USAGI <yasuyuki.kozakai@toshiba.co.jp>");

static int __init nf_conntrack_l3proto_ipv6_init(void)
{
	int ret = 0;

	need_conntrack();
	nf_defrag_ipv6_enable();

	ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_tcp6);
	if (ret < 0) {
		pr_err("nf_conntrack_ipv6: can't register tcp.\n");
		return ret;
	}

	ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_udp6);
	if (ret < 0) {
		pr_err("nf_conntrack_ipv6: can't register udp.\n");
		goto cleanup_tcp;
	}

	ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_icmpv6);
	if (ret < 0) {
		pr_err("nf_conntrack_ipv6: can't register icmpv6.\n");
		goto cleanup_udp;
	}

	ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv6);
	if (ret < 0) {
		pr_err("nf_conntrack_ipv6: can't register ipv6\n");
		goto cleanup_icmpv6;
	}

	ret = nf_register_hooks(ipv6_conntrack_ops,
				ARRAY_SIZE(ipv6_conntrack_ops));
	if (ret < 0) {
		pr_err("nf_conntrack_ipv6: can't register pre-routing defrag "
		       "hook.\n");
		goto cleanup_ipv6;
	}
	return ret;

 cleanup_ipv6:
	nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv6);
 cleanup_icmpv6:
	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmpv6);
 cleanup_udp:
	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udp6);
 cleanup_tcp:
	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_tcp6);
	return ret;
}

static void __exit nf_conntrack_l3proto_ipv6_fini(void)
{
	synchronize_net();
	nf_unregister_hooks(ipv6_conntrack_ops, ARRAY_SIZE(ipv6_conntrack_ops));
	nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv6);
	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmpv6);
	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udp6);
	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_tcp6);
}

module_init(nf_conntrack_l3proto_ipv6_init);
module_exit(nf_conntrack_l3proto_ipv6_fini);
Commit	Line	Data
9fb9cbb1 YK	1	/*
	2	* Copyright (C)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	*/
9fb9cbb1 YK	11
9fb9cbb1 YK	12	#include <linux/types.h>
	13	#include <linux/ipv6.h>
	14	#include <linux/in6.h>
	15	#include <linux/netfilter.h>
	16	#include <linux/module.h>
	17	#include <linux/skbuff.h>
	18	#include <linux/icmp.h>
9fb9cbb1	19	#include <net/ipv6.h>
04128f23	20	#include <net/inet_frag.h>
9fb9cbb1	21
8fa9ff68	22	#include <linux/netfilter_bridge.h>
9fb9cbb1 YK	23	#include <linux/netfilter_ipv6.h>
	24	#include <net/netfilter/nf_conntrack.h>
	25	#include <net/netfilter/nf_conntrack_helper.h>
605dcad6	26	#include <net/netfilter/nf_conntrack_l4proto.h>
9fb9cbb1 YK	27	#include <net/netfilter/nf_conntrack_l3proto.h>
9fb9cbb1 YK	28	#include <net/netfilter/nf_conntrack_core.h>
5d0aa2cc	29	#include <net/netfilter/nf_conntrack_zones.h>
9d2493f8	30	#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
e97c3e27	31	#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
74f7a655	32	#include <net/netfilter/nf_log.h>
9fb9cbb1	33
8ce8439a JE	34	static bool ipv6_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff,
8ce8439a JE	35	struct nf_conntrack_tuple *tuple)
9fb9cbb1	36	{
32948588 JE	37	const u_int32_t *ap;
32948588 JE	38	u_int32_t _addrs[8];
9fb9cbb1 YK	39
	40	ap = skb_header_pointer(skb, nhoff + offsetof(struct ipv6hdr, saddr),
	41	sizeof(_addrs), _addrs);
	42	if (ap == NULL)
8ce8439a	43	return false;
9fb9cbb1 YK	44
	45	memcpy(tuple->src.u3.ip6, ap, sizeof(tuple->src.u3.ip6));
	46	memcpy(tuple->dst.u3.ip6, ap + 4, sizeof(tuple->dst.u3.ip6));
	47
8ce8439a	48	return true;
9fb9cbb1 YK	49	}
9fb9cbb1 YK	50
8ce8439a JE	51	static bool ipv6_invert_tuple(struct nf_conntrack_tuple *tuple,
8ce8439a JE	52	const struct nf_conntrack_tuple *orig)
9fb9cbb1 YK	53	{
	54	memcpy(tuple->src.u3.ip6, orig->dst.u3.ip6, sizeof(tuple->src.u3.ip6));
	55	memcpy(tuple->dst.u3.ip6, orig->src.u3.ip6, sizeof(tuple->dst.u3.ip6));
	56
8ce8439a	57	return true;
9fb9cbb1 YK	58	}
	59
	60	static int ipv6_print_tuple(struct seq_file *s,
	61	const struct nf_conntrack_tuple *tuple)
	62	{
5b095d98	63	return seq_printf(s, "src=%pI6 dst=%pI6 ",
0c6ce78a	64	tuple->src.u3.ip6, tuple->dst.u3.ip6);
9fb9cbb1 YK	65	}
9fb9cbb1 YK	66
9fb9cbb1 YK	67	/*
	68	* Based on ipv6_skip_exthdr() in net/ipv6/exthdr.c
	69	*
	70	* This function parses (probably truncated) exthdr set "hdr"
	71	* of length "len". "nexthdrp" initially points to some place,
	72	* where type of the first header can be found.
	73	*
	74	* It skips all well-known exthdrs, and returns pointer to the start
	75	* of unparsable area i.e. the first header with unknown type.
	76	* if success, *nexthdr is updated by type/protocol of this header.
	77	*
	78	* NOTES: - it may return pointer pointing beyond end of packet,
	79	* if the last recognized header is truncated in the middle.
	80	* - if packet is truncated, so that all parsed headers are skipped,
	81	* it returns -1.
	82	* - if packet is fragmented, return pointer of the fragment header.
	83	* - ESP is unparsable for now and considered like
	84	* normal payload protocol.
	85	* - Note also special handling of AUTH header. Thanks to IPsec wizards.
	86	*/
	87
1a3a206f AB	88	static int nf_ct_ipv6_skip_exthdr(const struct sk_buff *skb, int start,
1a3a206f AB	89	u8 *nexthdrp, int len)
9fb9cbb1 YK	90	{
	91	u8 nexthdr = *nexthdrp;
	92
	93	while (ipv6_ext_hdr(nexthdr)) {
	94	struct ipv6_opt_hdr hdr;
	95	int hdrlen;
	96
	97	if (len < (int)sizeof(struct ipv6_opt_hdr))
	98	return -1;
	99	if (nexthdr == NEXTHDR_NONE)
	100	break;
	101	if (nexthdr == NEXTHDR_FRAGMENT)
	102	break;
	103	if (skb_copy_bits(skb, start, &hdr, sizeof(hdr)))
	104	BUG();
	105	if (nexthdr == NEXTHDR_AUTH)
	106	hdrlen = (hdr.hdrlen+2)<<2;
	107	else
	108	hdrlen = ipv6_optlen(&hdr);
	109
	110	nexthdr = hdr.nexthdr;
	111	len -= hdrlen;
	112	start += hdrlen;
	113	}
	114
	115	*nexthdrp = nexthdr;
	116	return start;
	117	}
	118
ffc30690 YK	119	static int ipv6_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
ffc30690 YK	120	unsigned int dataoff, u_int8_t protonum)
9fb9cbb1	121	{
ffc30690 YK	122	unsigned int extoff = nhoff + sizeof(struct ipv6hdr);
	123	unsigned char pnum;
	124	int protoff;
	125
	126	if (skb_copy_bits(skb, nhoff + offsetof(struct ipv6hdr, nexthdr),
	127	&pnum, sizeof(pnum)) != 0) {
	128	pr_debug("ip6_conntrack_core: can't get nexthdr\n");
	129	return -NF_ACCEPT;
	130	}
	131	protoff = nf_ct_ipv6_skip_exthdr(skb, extoff, &pnum, skb->len - extoff);
9fb9cbb1	132	/*
ffc30690	133	* (protoff == skb->len) mean that the packet doesn't have no data
9fb9cbb1 YK	134	* except of IPv6 & ext headers. but it's tracked anyway. - YK
9fb9cbb1 YK	135	*/
ffc30690	136	if ((protoff < 0) \|\| (protoff > skb->len)) {
0d53778e	137	pr_debug("ip6_conntrack_core: can't find proto in pkt\n");
9fb9cbb1 YK	138	return -NF_ACCEPT;
	139	}
	140
	141	*dataoff = protoff;
	142	*protonum = pnum;
	143	return NF_ACCEPT;
	144	}
	145
9fb9cbb1	146	static unsigned int ipv6_confirm(unsigned int hooknum,
3db05fea	147	struct sk_buff *skb,
9fb9cbb1 YK	148	const struct net_device *in,
	149	const struct net_device *out,
	150	int (okfn)(struct sk_buff ))
	151	{
	152	struct nf_conn *ct;
32948588 JE	153	const struct nf_conn_help *help;
32948588 JE	154	const struct nf_conntrack_helper *helper;
9fb9cbb1	155	enum ip_conntrack_info ctinfo;
dc808fe2	156	unsigned int ret, protoff;
3db05fea HX	157	unsigned int extoff = (u8 *)(ipv6_hdr(skb) + 1) - skb->data;
3db05fea HX	158	unsigned char pnum = ipv6_hdr(skb)->nexthdr;
dc808fe2	159
9fb9cbb1 YK	160
9fb9cbb1 YK	161	/* This is where we call the helper: as the packet goes out. */
3db05fea	162	ct = nf_ct_get(skb, &ctinfo);
fb048833	163	if (!ct \|\| ctinfo == IP_CT_RELATED_REPLY)
dc808fe2 HW	164	goto out;
	165
	166	help = nfct_help(ct);
3c158f7f PM	167	if (!help)
	168	goto out;
	169	/* rcu_read_lock()ed by nf_hook_slow */
	170	helper = rcu_dereference(help->helper);
	171	if (!helper)
dc808fe2 HW	172	goto out;
dc808fe2 HW	173
3db05fea HX	174	protoff = nf_ct_ipv6_skip_exthdr(skb, extoff, &pnum,
	175	skb->len - extoff);
	176	if (protoff > skb->len \|\| pnum == NEXTHDR_FRAGMENT) {
0d53778e	177	pr_debug("proto header not found\n");
dc808fe2	178	return NF_ACCEPT;
9fb9cbb1 YK	179	}
9fb9cbb1 YK	180
3db05fea	181	ret = helper->help(skb, protoff, ct, ctinfo);
74f7a655 PM	182	if (ret != NF_ACCEPT) {
	183	nf_log_packet(NFPROTO_IPV6, hooknum, skb, in, out, NULL,
	184	"nf_ct_%s: dropping packet", helper->name);
dc808fe2	185	return ret;
74f7a655	186	}
dc808fe2	187	out:
9fb9cbb1	188	/* We've seen it coming out the other side: confirm it */
3db05fea	189	return nf_conntrack_confirm(skb);
9fb9cbb1 YK	190	}
9fb9cbb1 YK	191
a702a65f AD	192	static unsigned int __ipv6_conntrack_in(struct net *net,
	193	unsigned int hooknum,
	194	struct sk_buff *skb,
	195	int (okfn)(struct sk_buff ))
9fb9cbb1	196	{
3db05fea	197	struct sk_buff *reasm = skb->nfct_reasm;
9fb9cbb1 YK	198
	199	/* This packet is fragmented and has reassembled packet. */
	200	if (reasm) {
	201	/* Reassembled packet isn't parsed yet ? */
	202	if (!reasm->nfct) {
	203	unsigned int ret;
	204
a702a65f	205	ret = nf_conntrack_in(net, PF_INET6, hooknum, reasm);
9fb9cbb1 YK	206	if (ret != NF_ACCEPT)
	207	return ret;
	208	}
	209	nf_conntrack_get(reasm->nfct);
3db05fea HX	210	skb->nfct = reasm->nfct;
3db05fea HX	211	skb->nfctinfo = reasm->nfctinfo;
9fb9cbb1 YK	212	return NF_ACCEPT;
	213	}
	214
a702a65f AD	215	return nf_conntrack_in(net, PF_INET6, hooknum, skb);
	216	}
	217
	218	static unsigned int ipv6_conntrack_in(unsigned int hooknum,
	219	struct sk_buff *skb,
	220	const struct net_device *in,
	221	const struct net_device *out,
	222	int (okfn)(struct sk_buff ))
	223	{
	224	return __ipv6_conntrack_in(dev_net(in), hooknum, skb, okfn);
9fb9cbb1 YK	225	}
	226
	227	static unsigned int ipv6_conntrack_local(unsigned int hooknum,
3db05fea	228	struct sk_buff *skb,
9fb9cbb1 YK	229	const struct net_device *in,
	230	const struct net_device *out,
	231	int (okfn)(struct sk_buff ))
	232	{
	233	/* root is playing with raw sockets. */
3db05fea	234	if (skb->len < sizeof(struct ipv6hdr)) {
e87cc472	235	net_notice_ratelimited("ipv6_conntrack_local: packet too short\n");
9fb9cbb1 YK	236	return NF_ACCEPT;
9fb9cbb1 YK	237	}
a702a65f	238	return __ipv6_conntrack_in(dev_net(out), hooknum, skb, okfn);
9fb9cbb1 YK	239	}
9fb9cbb1 YK	240
1999414a	241	static struct nf_hook_ops ipv6_conntrack_ops[] __read_mostly = {
964ddaa1 PM	242	{
	243	.hook = ipv6_conntrack_in,
	244	.owner = THIS_MODULE,
57750a22	245	.pf = NFPROTO_IPV6,
6e23ae2a	246	.hooknum = NF_INET_PRE_ROUTING,
964ddaa1 PM	247	.priority = NF_IP6_PRI_CONNTRACK,
	248	},
	249	{
	250	.hook = ipv6_conntrack_local,
	251	.owner = THIS_MODULE,
57750a22	252	.pf = NFPROTO_IPV6,
6e23ae2a	253	.hooknum = NF_INET_LOCAL_OUT,
964ddaa1 PM	254	.priority = NF_IP6_PRI_CONNTRACK,
964ddaa1 PM	255	},
964ddaa1 PM	256	{
	257	.hook = ipv6_confirm,
	258	.owner = THIS_MODULE,
57750a22	259	.pf = NFPROTO_IPV6,
6e23ae2a	260	.hooknum = NF_INET_POST_ROUTING,
964ddaa1 PM	261	.priority = NF_IP6_PRI_LAST,
	262	},
	263	{
	264	.hook = ipv6_confirm,
	265	.owner = THIS_MODULE,
57750a22	266	.pf = NFPROTO_IPV6,
6e23ae2a	267	.hooknum = NF_INET_LOCAL_IN,
964ddaa1 PM	268	.priority = NF_IP6_PRI_LAST-1,
964ddaa1 PM	269	},
9fb9cbb1 YK	270	};
9fb9cbb1 YK	271
e281db5c	272	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
c1d10adb PNA	273
	274	#include <linux/netfilter/nfnetlink.h>
	275	#include <linux/netfilter/nfnetlink_conntrack.h>
	276
fdf70832	277	static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
c1d10adb PNA	278	const struct nf_conntrack_tuple *tuple)
c1d10adb PNA	279	{
e549a6b3 DM	280	if (nla_put(skb, CTA_IP_V6_SRC, sizeof(u_int32_t) * 4,
	281	&tuple->src.u3.ip6) \|\|
	282	nla_put(skb, CTA_IP_V6_DST, sizeof(u_int32_t) * 4,
	283	&tuple->dst.u3.ip6))
	284	goto nla_put_failure;
c1d10adb PNA	285	return 0;
c1d10adb PNA	286
df6fb868	287	nla_put_failure:
c1d10adb PNA	288	return -1;
	289	}
	290
f73e924c PM	291	static const struct nla_policy ipv6_nla_policy[CTA_IP_MAX+1] = {
	292	[CTA_IP_V6_SRC] = { .len = sizeof(u_int32_t)*4 },
	293	[CTA_IP_V6_DST] = { .len = sizeof(u_int32_t)*4 },
c1d10adb PNA	294	};
c1d10adb PNA	295
fdf70832	296	static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
c1d10adb PNA	297	struct nf_conntrack_tuple *t)
c1d10adb PNA	298	{
df6fb868	299	if (!tb[CTA_IP_V6_SRC] \|\| !tb[CTA_IP_V6_DST])
c1d10adb PNA	300	return -EINVAL;
c1d10adb PNA	301
df6fb868	302	memcpy(&t->src.u3.ip6, nla_data(tb[CTA_IP_V6_SRC]),
c1d10adb	303	sizeof(u_int32_t) * 4);
df6fb868	304	memcpy(&t->dst.u3.ip6, nla_data(tb[CTA_IP_V6_DST]),
c1d10adb PNA	305	sizeof(u_int32_t) * 4);
	306
	307	return 0;
	308	}
a400c30e HE	309
	310	static int ipv6_nlattr_tuple_size(void)
	311	{
	312	return nla_policy_len(ipv6_nla_policy, CTA_IP_MAX + 1);
	313	}
c1d10adb PNA	314	#endif
c1d10adb PNA	315
61075af5	316	struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6 __read_mostly = {
9fb9cbb1 YK	317	.l3proto = PF_INET6,
	318	.name = "ipv6",
	319	.pkt_to_tuple = ipv6_pkt_to_tuple,
	320	.invert_tuple = ipv6_invert_tuple,
	321	.print_tuple = ipv6_print_tuple,
ffc30690	322	.get_l4proto = ipv6_get_l4proto,
e281db5c	323	#if defined(CONFIG_NF_CT_NETLINK) \|\| defined(CONFIG_NF_CT_NETLINK_MODULE)
fdf70832	324	.tuple_to_nlattr = ipv6_tuple_to_nlattr,
a400c30e	325	.nlattr_tuple_size = ipv6_nlattr_tuple_size,
fdf70832	326	.nlattr_to_tuple = ipv6_nlattr_to_tuple,
f73e924c	327	.nla_policy = ipv6_nla_policy,
c1d10adb	328	#endif
9fb9cbb1 YK	329	.me = THIS_MODULE,
	330	};
	331
32292a7f PM	332	MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET6));
	333	MODULE_LICENSE("GPL");
	334	MODULE_AUTHOR("Yasuyuki KOZAKAI @USAGI <yasuyuki.kozakai@toshiba.co.jp>");
	335
	336	static int __init nf_conntrack_l3proto_ipv6_init(void)
9fb9cbb1 YK	337	{
	338	int ret = 0;
	339
32292a7f	340	need_conntrack();
e97c3e27	341	nf_defrag_ipv6_enable();
9fb9cbb1	342
605dcad6	343	ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_tcp6);
9fb9cbb1	344	if (ret < 0) {
654d0fbd	345	pr_err("nf_conntrack_ipv6: can't register tcp.\n");
e97c3e27	346	return ret;
9fb9cbb1 YK	347	}
9fb9cbb1 YK	348
605dcad6	349	ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_udp6);
9fb9cbb1	350	if (ret < 0) {
654d0fbd	351	pr_err("nf_conntrack_ipv6: can't register udp.\n");
9fb9cbb1 YK	352	goto cleanup_tcp;
	353	}
	354
605dcad6	355	ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_icmpv6);
9fb9cbb1	356	if (ret < 0) {
654d0fbd	357	pr_err("nf_conntrack_ipv6: can't register icmpv6.\n");
9fb9cbb1 YK	358	goto cleanup_udp;
	359	}
	360
	361	ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv6);
	362	if (ret < 0) {
654d0fbd	363	pr_err("nf_conntrack_ipv6: can't register ipv6\n");
9fb9cbb1 YK	364	goto cleanup_icmpv6;
	365	}
	366
964ddaa1 PM	367	ret = nf_register_hooks(ipv6_conntrack_ops,
964ddaa1 PM	368	ARRAY_SIZE(ipv6_conntrack_ops));
9fb9cbb1	369	if (ret < 0) {
654d0fbd	370	pr_err("nf_conntrack_ipv6: can't register pre-routing defrag "
9fb9cbb1 YK	371	"hook.\n");
	372	goto cleanup_ipv6;
	373	}
9fb9cbb1 YK	374	return ret;
9fb9cbb1 YK	375
9fb9cbb1 YK	376	cleanup_ipv6:
	377	nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv6);
	378	cleanup_icmpv6:
605dcad6	379	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmpv6);
9fb9cbb1	380	cleanup_udp:
605dcad6	381	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udp6);
9fb9cbb1	382	cleanup_tcp:
605dcad6	383	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_tcp6);
9fb9cbb1 YK	384	return ret;
	385	}
	386
65b4b4e8	387	static void __exit nf_conntrack_l3proto_ipv6_fini(void)
9fb9cbb1	388	{
32292a7f	389	synchronize_net();
32292a7f PM	390	nf_unregister_hooks(ipv6_conntrack_ops, ARRAY_SIZE(ipv6_conntrack_ops));
32292a7f PM	391	nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv6);
605dcad6 MJ	392	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmpv6);
	393	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udp6);
	394	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_tcp6);
9fb9cbb1 YK	395	}
9fb9cbb1 YK	396
65b4b4e8 AM	397	module_init(nf_conntrack_l3proto_ipv6_init);
65b4b4e8 AM	398	module_exit(nf_conntrack_l3proto_ipv6_fini);