[deliverable/linux.git] / net / ipv6 / xfrm6_tunnel.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 as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Authors	Mitsuru KANDA  <mk@linux-ipv6.org>
 * 		YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
 *
 * Based on net/ipv4/xfrm4_tunnel.c
 *
 */
#include <linux/module.h>
#include <linux/xfrm.h>
#include <linux/rculist.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/ipv6.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/mutex.h>

/*
 * xfrm_tunnel_spi things are for allocating unique id ("spi")
 * per xfrm_address_t.
 */
struct xfrm6_tunnel_spi {
	struct hlist_node	list_byaddr;
	struct hlist_node	list_byspi;
	xfrm_address_t		addr;
	u32			spi;
	atomic_t		refcnt;
	struct rcu_head		rcu_head;
};

static DEFINE_SPINLOCK(xfrm6_tunnel_spi_lock);

static u32 xfrm6_tunnel_spi;

#define XFRM6_TUNNEL_SPI_MIN	1
#define XFRM6_TUNNEL_SPI_MAX	0xffffffff

static struct kmem_cache *xfrm6_tunnel_spi_kmem __read_mostly;

#define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
#define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256

static struct hlist_head xfrm6_tunnel_spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
static struct hlist_head xfrm6_tunnel_spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];

static inline unsigned xfrm6_tunnel_spi_hash_byaddr(xfrm_address_t *addr)
{
	unsigned h;

	h = (__force u32)(addr->a6[0] ^ addr->a6[1] ^ addr->a6[2] ^ addr->a6[3]);
	h ^= h >> 16;
	h ^= h >> 8;
	h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;

	return h;
}

static inline unsigned xfrm6_tunnel_spi_hash_byspi(u32 spi)
{
	return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
}


static int xfrm6_tunnel_spi_init(void)
{
	int i;

	xfrm6_tunnel_spi = 0;
	xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi",
						  sizeof(struct xfrm6_tunnel_spi),
						  0, SLAB_HWCACHE_ALIGN,
						  NULL);
	if (!xfrm6_tunnel_spi_kmem)
		return -ENOMEM;

	for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
		INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byaddr[i]);
	for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
		INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byspi[i]);
	return 0;
}

static void xfrm6_tunnel_spi_fini(void)
{
	int i;

	for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++) {
		if (!hlist_empty(&xfrm6_tunnel_spi_byaddr[i]))
			return;
	}
	for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++) {
		if (!hlist_empty(&xfrm6_tunnel_spi_byspi[i]))
			return;
	}
	rcu_barrier();
	kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
	xfrm6_tunnel_spi_kmem = NULL;
}

static struct xfrm6_tunnel_spi *__xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr)
{
	struct xfrm6_tunnel_spi *x6spi;
	struct hlist_node *pos;

	hlist_for_each_entry_rcu(x6spi, pos,
			     &xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
			     list_byaddr) {
		if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0)
			return x6spi;
	}

	return NULL;
}

__be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr)
{
	struct xfrm6_tunnel_spi *x6spi;
	u32 spi;

	rcu_read_lock_bh();
	x6spi = __xfrm6_tunnel_spi_lookup(saddr);
	spi = x6spi ? x6spi->spi : 0;
	rcu_read_unlock_bh();
	return htonl(spi);
}

EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);

static int __xfrm6_tunnel_spi_check(u32 spi)
{
	struct xfrm6_tunnel_spi *x6spi;
	int index = xfrm6_tunnel_spi_hash_byspi(spi);
	struct hlist_node *pos;

	hlist_for_each_entry(x6spi, pos,
			     &xfrm6_tunnel_spi_byspi[index],
			     list_byspi) {
		if (x6spi->spi == spi)
			return -1;
	}
	return index;
}

static u32 __xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
{
	u32 spi;
	struct xfrm6_tunnel_spi *x6spi;
	int index;

	if (xfrm6_tunnel_spi < XFRM6_TUNNEL_SPI_MIN ||
	    xfrm6_tunnel_spi >= XFRM6_TUNNEL_SPI_MAX)
		xfrm6_tunnel_spi = XFRM6_TUNNEL_SPI_MIN;
	else
		xfrm6_tunnel_spi++;

	for (spi = xfrm6_tunnel_spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
		index = __xfrm6_tunnel_spi_check(spi);
		if (index >= 0)
			goto alloc_spi;
	}
	for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tunnel_spi; spi++) {
		index = __xfrm6_tunnel_spi_check(spi);
		if (index >= 0)
			goto alloc_spi;
	}
	spi = 0;
	goto out;
alloc_spi:
	xfrm6_tunnel_spi = spi;
	x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, GFP_ATOMIC);
	if (!x6spi)
		goto out;

	INIT_RCU_HEAD(&x6spi->rcu_head);
	memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
	x6spi->spi = spi;
	atomic_set(&x6spi->refcnt, 1);

	hlist_add_head_rcu(&x6spi->list_byspi, &xfrm6_tunnel_spi_byspi[index]);

	index = xfrm6_tunnel_spi_hash_byaddr(saddr);
	hlist_add_head_rcu(&x6spi->list_byaddr, &xfrm6_tunnel_spi_byaddr[index]);
out:
	return spi;
}

__be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
{
	struct xfrm6_tunnel_spi *x6spi;
	u32 spi;

	spin_lock_bh(&xfrm6_tunnel_spi_lock);
	x6spi = __xfrm6_tunnel_spi_lookup(saddr);
	if (x6spi) {
		atomic_inc(&x6spi->refcnt);
		spi = x6spi->spi;
	} else
		spi = __xfrm6_tunnel_alloc_spi(saddr);
	spin_unlock_bh(&xfrm6_tunnel_spi_lock);

	return htonl(spi);
}

EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);

static void x6spi_destroy_rcu(struct rcu_head *head)
{
	kmem_cache_free(xfrm6_tunnel_spi_kmem,
			container_of(head, struct xfrm6_tunnel_spi, rcu_head));
}

void xfrm6_tunnel_free_spi(xfrm_address_t *saddr)
{
	struct xfrm6_tunnel_spi *x6spi;
	struct hlist_node *pos, *n;

	spin_lock_bh(&xfrm6_tunnel_spi_lock);

	hlist_for_each_entry_safe(x6spi, pos, n,
				  &xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
				  list_byaddr)
	{
		if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0) {
			if (atomic_dec_and_test(&x6spi->refcnt)) {
				hlist_del_rcu(&x6spi->list_byaddr);
				hlist_del_rcu(&x6spi->list_byspi);
				call_rcu(&x6spi->rcu_head, x6spi_destroy_rcu);
				break;
			}
		}
	}
	spin_unlock_bh(&xfrm6_tunnel_spi_lock);
}

EXPORT_SYMBOL(xfrm6_tunnel_free_spi);

static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
{
	skb_push(skb, -skb_network_offset(skb));
	return 0;
}

static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
{
	return skb_network_header(skb)[IP6CB(skb)->nhoff];
}

static int xfrm6_tunnel_rcv(struct sk_buff *skb)
{
	struct ipv6hdr *iph = ipv6_hdr(skb);
	__be32 spi;

	spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&iph->saddr);
	return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi) > 0 ? : 0;
}

static int xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
			    u8 type, u8 code, int offset, __be32 info)
{
	/* xfrm6_tunnel native err handling */
	switch (type) {
	case ICMPV6_DEST_UNREACH:
		switch (code) {
		case ICMPV6_NOROUTE:
		case ICMPV6_ADM_PROHIBITED:
		case ICMPV6_NOT_NEIGHBOUR:
		case ICMPV6_ADDR_UNREACH:
		case ICMPV6_PORT_UNREACH:
		default:
			break;
		}
		break;
	case ICMPV6_PKT_TOOBIG:
		break;
	case ICMPV6_TIME_EXCEED:
		switch (code) {
		case ICMPV6_EXC_HOPLIMIT:
			break;
		case ICMPV6_EXC_FRAGTIME:
		default:
			break;
		}
		break;
	case ICMPV6_PARAMPROB:
		switch (code) {
		case ICMPV6_HDR_FIELD: break;
		case ICMPV6_UNK_NEXTHDR: break;
		case ICMPV6_UNK_OPTION: break;
		}
		break;
	default:
		break;
	}

	return 0;
}

static int xfrm6_tunnel_init_state(struct xfrm_state *x)
{
	if (x->props.mode != XFRM_MODE_TUNNEL)
		return -EINVAL;

	if (x->encap)
		return -EINVAL;

	x->props.header_len = sizeof(struct ipv6hdr);

	return 0;
}

static void xfrm6_tunnel_destroy(struct xfrm_state *x)
{
	xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
}

static const struct xfrm_type xfrm6_tunnel_type = {
	.description	= "IP6IP6",
	.owner          = THIS_MODULE,
	.proto		= IPPROTO_IPV6,
	.init_state	= xfrm6_tunnel_init_state,
	.destructor	= xfrm6_tunnel_destroy,
	.input		= xfrm6_tunnel_input,
	.output		= xfrm6_tunnel_output,
};

static struct xfrm6_tunnel xfrm6_tunnel_handler = {
	.handler	= xfrm6_tunnel_rcv,
	.err_handler	= xfrm6_tunnel_err,
	.priority	= 2,
};

static struct xfrm6_tunnel xfrm46_tunnel_handler = {
	.handler	= xfrm6_tunnel_rcv,
	.err_handler	= xfrm6_tunnel_err,
	.priority	= 2,
};

static int __init xfrm6_tunnel_init(void)
{
	if (xfrm_register_type(&xfrm6_tunnel_type, AF_INET6) < 0)
		goto err;
	if (xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6))
		goto unreg;
	if (xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET))
		goto dereg6;
	if (xfrm6_tunnel_spi_init() < 0)
		goto dereg46;
	return 0;

dereg46:
	xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
dereg6:
	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
unreg:
	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
err:
	return -EAGAIN;
}

static void __exit xfrm6_tunnel_fini(void)
{
	xfrm6_tunnel_spi_fini();
	xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
}

module_init(xfrm6_tunnel_init);
module_exit(xfrm6_tunnel_fini);
MODULE_LICENSE("GPL");
MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_IPV6);
Commit	Line	Data
1da177e4 LT	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 as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
1ab1457c	8	*
1da177e4 LT	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1ab1457c	13	*
1da177e4 LT	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	17	*
	18	* Authors Mitsuru KANDA <mk@linux-ipv6.org>
	19	* YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
	20	*
	21	* Based on net/ipv4/xfrm4_tunnel.c
	22	*
	23	*/
1da177e4 LT	24	#include <linux/module.h>
1da177e4 LT	25	#include <linux/xfrm.h>
91cc3bb0	26	#include <linux/rculist.h>
1da177e4 LT	27	#include <net/ip.h>
	28	#include <net/xfrm.h>
	29	#include <net/ipv6.h>
1da177e4 LT	30	#include <linux/ipv6.h>
1da177e4 LT	31	#include <linux/icmpv6.h>
4a3e2f71	32	#include <linux/mutex.h>
1da177e4	33
1da177e4	34	/*
1ab1457c	35	* xfrm_tunnel_spi things are for allocating unique id ("spi")
1da177e4 LT	36	* per xfrm_address_t.
	37	*/
	38	struct xfrm6_tunnel_spi {
91cc3bb0 ED	39	struct hlist_node list_byaddr;
	40	struct hlist_node list_byspi;
	41	xfrm_address_t addr;
	42	u32 spi;
	43	atomic_t refcnt;
	44	struct rcu_head rcu_head;
1da177e4 LT	45	};
1da177e4 LT	46
91cc3bb0	47	static DEFINE_SPINLOCK(xfrm6_tunnel_spi_lock);
1da177e4 LT	48
	49	static u32 xfrm6_tunnel_spi;
	50
	51	#define XFRM6_TUNNEL_SPI_MIN 1
	52	#define XFRM6_TUNNEL_SPI_MAX 0xffffffff
	53
e18b890b	54	static struct kmem_cache *xfrm6_tunnel_spi_kmem __read_mostly;
1da177e4 LT	55
	56	#define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
	57	#define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
	58
	59	static struct hlist_head xfrm6_tunnel_spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
	60	static struct hlist_head xfrm6_tunnel_spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];
	61
b6f99a21	62	static inline unsigned xfrm6_tunnel_spi_hash_byaddr(xfrm_address_t *addr)
1da177e4 LT	63	{
	64	unsigned h;
	65
8c689a6e	66	h = (__force u32)(addr->a6[0] ^ addr->a6[1] ^ addr->a6[2] ^ addr->a6[3]);
1da177e4 LT	67	h ^= h >> 16;
	68	h ^= h >> 8;
	69	h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;
	70
1da177e4 LT	71	return h;
	72	}
	73
b6f99a21	74	static inline unsigned xfrm6_tunnel_spi_hash_byspi(u32 spi)
1da177e4 LT	75	{
	76	return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
	77	}
	78
	79
	80	static int xfrm6_tunnel_spi_init(void)
	81	{
	82	int i;
	83
1da177e4 LT	84	xfrm6_tunnel_spi = 0;
	85	xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi",
	86	sizeof(struct xfrm6_tunnel_spi),
	87	0, SLAB_HWCACHE_ALIGN,
20c2df83	88	NULL);
a922ba55	89	if (!xfrm6_tunnel_spi_kmem)
1da177e4	90	return -ENOMEM;
1da177e4 LT	91
	92	for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
	93	INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byaddr[i]);
	94	for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
	95	INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byspi[i]);
	96	return 0;
	97	}
	98
	99	static void xfrm6_tunnel_spi_fini(void)
	100	{
	101	int i;
	102
1da177e4 LT	103	for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++) {
1da177e4 LT	104	if (!hlist_empty(&xfrm6_tunnel_spi_byaddr[i]))
a922ba55	105	return;
1da177e4 LT	106	}
	107	for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++) {
	108	if (!hlist_empty(&xfrm6_tunnel_spi_byspi[i]))
a922ba55	109	return;
1da177e4	110	}
91cc3bb0	111	rcu_barrier();
1da177e4 LT	112	kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
1da177e4 LT	113	xfrm6_tunnel_spi_kmem = NULL;
1da177e4 LT	114	}
	115
	116	static struct xfrm6_tunnel_spi __xfrm6_tunnel_spi_lookup(xfrm_address_t saddr)
	117	{
	118	struct xfrm6_tunnel_spi *x6spi;
	119	struct hlist_node *pos;
	120
91cc3bb0	121	hlist_for_each_entry_rcu(x6spi, pos,
1da177e4 LT	122	&xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
1da177e4 LT	123	list_byaddr) {
a922ba55	124	if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0)
1da177e4	125	return x6spi;
1da177e4 LT	126	}
1da177e4 LT	127
1da177e4 LT	128	return NULL;
	129	}
	130
8c689a6e	131	__be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr)
1da177e4 LT	132	{
	133	struct xfrm6_tunnel_spi *x6spi;
	134	u32 spi;
	135
91cc3bb0	136	rcu_read_lock_bh();
1da177e4 LT	137	x6spi = __xfrm6_tunnel_spi_lookup(saddr);
1da177e4 LT	138	spi = x6spi ? x6spi->spi : 0;
91cc3bb0	139	rcu_read_unlock_bh();
5b122545	140	return htonl(spi);
1da177e4 LT	141	}
	142
	143	EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
	144
df8ea19b YH	145	static int __xfrm6_tunnel_spi_check(u32 spi)
	146	{
	147	struct xfrm6_tunnel_spi *x6spi;
	148	int index = xfrm6_tunnel_spi_hash_byspi(spi);
	149	struct hlist_node *pos;
	150
	151	hlist_for_each_entry(x6spi, pos,
	152	&xfrm6_tunnel_spi_byspi[index],
	153	list_byspi) {
	154	if (x6spi->spi == spi)
	155	return -1;
	156	}
	157	return index;
	158	}
	159
1da177e4 LT	160	static u32 __xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
	161	{
	162	u32 spi;
	163	struct xfrm6_tunnel_spi *x6spi;
df8ea19b	164	int index;
1da177e4	165
1da177e4 LT	166	if (xfrm6_tunnel_spi < XFRM6_TUNNEL_SPI_MIN \|\|
	167	xfrm6_tunnel_spi >= XFRM6_TUNNEL_SPI_MAX)
	168	xfrm6_tunnel_spi = XFRM6_TUNNEL_SPI_MIN;
	169	else
	170	xfrm6_tunnel_spi++;
	171
	172	for (spi = xfrm6_tunnel_spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
df8ea19b YH	173	index = __xfrm6_tunnel_spi_check(spi);
	174	if (index >= 0)
	175	goto alloc_spi;
1da177e4 LT	176	}
1da177e4 LT	177	for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tunnel_spi; spi++) {
df8ea19b YH	178	index = __xfrm6_tunnel_spi_check(spi);
	179	if (index >= 0)
	180	goto alloc_spi;
1da177e4 LT	181	}
	182	spi = 0;
	183	goto out;
	184	alloc_spi:
df8ea19b	185	xfrm6_tunnel_spi = spi;
54e6ecb2	186	x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, GFP_ATOMIC);
a922ba55	187	if (!x6spi)
1da177e4	188	goto out;
a922ba55	189
91cc3bb0	190	INIT_RCU_HEAD(&x6spi->rcu_head);
1da177e4 LT	191	memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
	192	x6spi->spi = spi;
	193	atomic_set(&x6spi->refcnt, 1);
	194
91cc3bb0	195	hlist_add_head_rcu(&x6spi->list_byspi, &xfrm6_tunnel_spi_byspi[index]);
1da177e4 LT	196
1da177e4 LT	197	index = xfrm6_tunnel_spi_hash_byaddr(saddr);
91cc3bb0	198	hlist_add_head_rcu(&x6spi->list_byaddr, &xfrm6_tunnel_spi_byaddr[index]);
1da177e4	199	out:
1da177e4 LT	200	return spi;
	201	}
	202
8c689a6e	203	__be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
1da177e4 LT	204	{
	205	struct xfrm6_tunnel_spi *x6spi;
	206	u32 spi;
	207
91cc3bb0	208	spin_lock_bh(&xfrm6_tunnel_spi_lock);
1da177e4 LT	209	x6spi = __xfrm6_tunnel_spi_lookup(saddr);
	210	if (x6spi) {
	211	atomic_inc(&x6spi->refcnt);
	212	spi = x6spi->spi;
	213	} else
	214	spi = __xfrm6_tunnel_alloc_spi(saddr);
91cc3bb0	215	spin_unlock_bh(&xfrm6_tunnel_spi_lock);
1da177e4	216
5b122545	217	return htonl(spi);
1da177e4 LT	218	}
	219
	220	EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);
	221
91cc3bb0 ED	222	static void x6spi_destroy_rcu(struct rcu_head *head)
	223	{
	224	kmem_cache_free(xfrm6_tunnel_spi_kmem,
	225	container_of(head, struct xfrm6_tunnel_spi, rcu_head));
	226	}
	227
1da177e4 LT	228	void xfrm6_tunnel_free_spi(xfrm_address_t *saddr)
	229	{
	230	struct xfrm6_tunnel_spi *x6spi;
	231	struct hlist_node pos, n;
	232
91cc3bb0	233	spin_lock_bh(&xfrm6_tunnel_spi_lock);
1da177e4	234
1ab1457c	235	hlist_for_each_entry_safe(x6spi, pos, n,
1da177e4 LT	236	&xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
	237	list_byaddr)
	238	{
	239	if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0) {
1da177e4	240	if (atomic_dec_and_test(&x6spi->refcnt)) {
91cc3bb0 ED	241	hlist_del_rcu(&x6spi->list_byaddr);
	242	hlist_del_rcu(&x6spi->list_byspi);
	243	call_rcu(&x6spi->rcu_head, x6spi_destroy_rcu);
1da177e4 LT	244	break;
	245	}
	246	}
	247	}
91cc3bb0	248	spin_unlock_bh(&xfrm6_tunnel_spi_lock);
1da177e4 LT	249	}
	250
	251	EXPORT_SYMBOL(xfrm6_tunnel_free_spi);
	252
	253	static int xfrm6_tunnel_output(struct xfrm_state x, struct sk_buff skb)
	254	{
7b277b1a	255	skb_push(skb, -skb_network_offset(skb));
1da177e4 LT	256	return 0;
	257	}
	258
e695633e	259	static int xfrm6_tunnel_input(struct xfrm_state x, struct sk_buff skb)
1da177e4	260	{
04663d0b	261	return skb_network_header(skb)[IP6CB(skb)->nhoff];
1da177e4 LT	262	}
1da177e4 LT	263
d2acc347	264	static int xfrm6_tunnel_rcv(struct sk_buff *skb)
1da177e4	265	{
0660e03f	266	struct ipv6hdr *iph = ipv6_hdr(skb);
a252cc23	267	__be32 spi;
1da177e4	268
1da177e4	269	spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&iph->saddr);
33b5ecb8	270	return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi) > 0 ? : 0;
1da177e4 LT	271	}
1da177e4 LT	272
d2acc347	273	static int xfrm6_tunnel_err(struct sk_buff skb, struct inet6_skb_parm opt,
d5fdd6ba	274	u8 type, u8 code, int offset, __be32 info)
1da177e4	275	{
1da177e4 LT	276	/* xfrm6_tunnel native err handling */
1da177e4 LT	277	switch (type) {
1ab1457c	278	case ICMPV6_DEST_UNREACH:
1da177e4	279	switch (code) {
1ab1457c	280	case ICMPV6_NOROUTE:
1da177e4 LT	281	case ICMPV6_ADM_PROHIBITED:
	282	case ICMPV6_NOT_NEIGHBOUR:
	283	case ICMPV6_ADDR_UNREACH:
	284	case ICMPV6_PORT_UNREACH:
	285	default:
1da177e4 LT	286	break;
	287	}
	288	break;
	289	case ICMPV6_PKT_TOOBIG:
1da177e4 LT	290	break;
	291	case ICMPV6_TIME_EXCEED:
	292	switch (code) {
	293	case ICMPV6_EXC_HOPLIMIT:
1da177e4 LT	294	break;
1da177e4 LT	295	case ICMPV6_EXC_FRAGTIME:
1ab1457c	296	default:
1da177e4 LT	297	break;
	298	}
	299	break;
	300	case ICMPV6_PARAMPROB:
	301	switch (code) {
	302	case ICMPV6_HDR_FIELD: break;
	303	case ICMPV6_UNK_NEXTHDR: break;
	304	case ICMPV6_UNK_OPTION: break;
	305	}
	306	break;
	307	default:
	308	break;
	309	}
d2acc347 HX	310
d2acc347 HX	311	return 0;
1da177e4 LT	312	}
1da177e4 LT	313
72cb6962	314	static int xfrm6_tunnel_init_state(struct xfrm_state *x)
1da177e4	315	{
7e49e6de	316	if (x->props.mode != XFRM_MODE_TUNNEL)
1da177e4 LT	317	return -EINVAL;
	318
	319	if (x->encap)
	320	return -EINVAL;
	321
	322	x->props.header_len = sizeof(struct ipv6hdr);
	323
	324	return 0;
	325	}
	326
	327	static void xfrm6_tunnel_destroy(struct xfrm_state *x)
	328	{
	329	xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
	330	}
	331
533cb5b0	332	static const struct xfrm_type xfrm6_tunnel_type = {
1da177e4 LT	333	.description = "IP6IP6",
	334	.owner = THIS_MODULE,
	335	.proto = IPPROTO_IPV6,
	336	.init_state = xfrm6_tunnel_init_state,
	337	.destructor = xfrm6_tunnel_destroy,
	338	.input = xfrm6_tunnel_input,
	339	.output = xfrm6_tunnel_output,
	340	};
	341
d2acc347	342	static struct xfrm6_tunnel xfrm6_tunnel_handler = {
1da177e4	343	.handler = xfrm6_tunnel_rcv,
d2acc347 HX	344	.err_handler = xfrm6_tunnel_err,
d2acc347 HX	345	.priority = 2,
1da177e4 LT	346	};
1da177e4 LT	347
73d605d1 KM	348	static struct xfrm6_tunnel xfrm46_tunnel_handler = {
	349	.handler = xfrm6_tunnel_rcv,
	350	.err_handler = xfrm6_tunnel_err,
	351	.priority = 2,
	352	};
	353
1da177e4 LT	354	static int __init xfrm6_tunnel_init(void)
1da177e4 LT	355	{
a922ba55	356	if (xfrm_register_type(&xfrm6_tunnel_type, AF_INET6) < 0)
5ce1bbb9 IJ	357	goto err;
	358	if (xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6))
	359	goto unreg;
	360	if (xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET))
	361	goto dereg6;
	362	if (xfrm6_tunnel_spi_init() < 0)
	363	goto dereg46;
1da177e4	364	return 0;
5ce1bbb9 IJ	365
	366	dereg46:
	367	xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
	368	dereg6:
	369	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
	370	unreg:
	371	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
	372	err:
	373	return -EAGAIN;
1da177e4 LT	374	}
	375
	376	static void __exit xfrm6_tunnel_fini(void)
	377	{
1da177e4	378	xfrm6_tunnel_spi_fini();
73d605d1 KM	379	xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
73d605d1 KM	380	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
a922ba55	381	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
1da177e4 LT	382	}
	383
	384	module_init(xfrm6_tunnel_init);
	385	module_exit(xfrm6_tunnel_fini);
	386	MODULE_LICENSE("GPL");
d3d6dd3a	387	MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_IPV6);