[net-next-2.6.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/list.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;
};

static DEFINE_RWLOCK(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;
	}
	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(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;

	read_lock_bh(&xfrm6_tunnel_spi_lock);
	x6spi = __xfrm6_tunnel_spi_lookup(saddr);
	spi = x6spi ? x6spi->spi : 0;
	read_unlock_bh(&xfrm6_tunnel_spi_lock);
	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;

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

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

	index = xfrm6_tunnel_spi_hash_byaddr(saddr);
	hlist_add_head(&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;

	write_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);
	write_unlock_bh(&xfrm6_tunnel_spi_lock);

	return htonl(spi);
}

EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);

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

	write_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(&x6spi->list_byaddr);
				hlist_del(&x6spi->list_byspi);
				kmem_cache_free(xfrm6_tunnel_spi_kmem, x6spi);
				break;
			}
		}
	}
	write_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,
			    int type, int 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)
		return -EAGAIN;

	if (xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6)) {
		xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
		return -EAGAIN;
	}
	if (xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET)) {
		xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
		xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
		return -EAGAIN;
	}
	if (xfrm6_tunnel_spi_init() < 0) {
		xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
		xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
		xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
		return -EAGAIN;
	}
	return 0;
}

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>
	25	#include <linux/xfrm.h>
	26	#include <linux/list.h>
	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 {
	39	struct hlist_node list_byaddr;
	40	struct hlist_node list_byspi;
	41	xfrm_address_t addr;
	42	u32 spi;
	43	atomic_t refcnt;
1da177e4 LT	44	};
1da177e4 LT	45
1da177e4 LT	46	static DEFINE_RWLOCK(xfrm6_tunnel_spi_lock);
	47
	48	static u32 xfrm6_tunnel_spi;
	49
	50	#define XFRM6_TUNNEL_SPI_MIN 1
	51	#define XFRM6_TUNNEL_SPI_MAX 0xffffffff
	52
e18b890b	53	static struct kmem_cache *xfrm6_tunnel_spi_kmem __read_mostly;
1da177e4 LT	54
	55	#define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
	56	#define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
	57
	58	static struct hlist_head xfrm6_tunnel_spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
	59	static struct hlist_head xfrm6_tunnel_spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];
	60
b6f99a21	61	static inline unsigned xfrm6_tunnel_spi_hash_byaddr(xfrm_address_t *addr)
1da177e4 LT	62	{
	63	unsigned h;
	64
8c689a6e	65	h = (__force u32)(addr->a6[0] ^ addr->a6[1] ^ addr->a6[2] ^ addr->a6[3]);
1da177e4 LT	66	h ^= h >> 16;
	67	h ^= h >> 8;
	68	h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;
	69
1da177e4 LT	70	return h;
	71	}
	72
b6f99a21	73	static inline unsigned xfrm6_tunnel_spi_hash_byspi(u32 spi)
1da177e4 LT	74	{
	75	return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
	76	}
	77
	78
	79	static int xfrm6_tunnel_spi_init(void)
	80	{
	81	int i;
	82
1da177e4 LT	83	xfrm6_tunnel_spi = 0;
	84	xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi",
	85	sizeof(struct xfrm6_tunnel_spi),
	86	0, SLAB_HWCACHE_ALIGN,
20c2df83	87	NULL);
a922ba55	88	if (!xfrm6_tunnel_spi_kmem)
1da177e4	89	return -ENOMEM;
1da177e4 LT	90
	91	for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
	92	INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byaddr[i]);
	93	for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
	94	INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byspi[i]);
	95	return 0;
	96	}
	97
	98	static void xfrm6_tunnel_spi_fini(void)
	99	{
	100	int i;
	101
1da177e4 LT	102	for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++) {
1da177e4 LT	103	if (!hlist_empty(&xfrm6_tunnel_spi_byaddr[i]))
a922ba55	104	return;
1da177e4 LT	105	}
	106	for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++) {
	107	if (!hlist_empty(&xfrm6_tunnel_spi_byspi[i]))
a922ba55	108	return;
1da177e4 LT	109	}
	110	kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
	111	xfrm6_tunnel_spi_kmem = NULL;
1da177e4 LT	112	}
	113
	114	static struct xfrm6_tunnel_spi __xfrm6_tunnel_spi_lookup(xfrm_address_t saddr)
	115	{
	116	struct xfrm6_tunnel_spi *x6spi;
	117	struct hlist_node *pos;
	118
1da177e4 LT	119	hlist_for_each_entry(x6spi, pos,
	120	&xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
	121	list_byaddr) {
a922ba55	122	if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0)
1da177e4	123	return x6spi;
1da177e4 LT	124	}
1da177e4 LT	125
1da177e4 LT	126	return NULL;
	127	}
	128
8c689a6e	129	__be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr)
1da177e4 LT	130	{
	131	struct xfrm6_tunnel_spi *x6spi;
	132	u32 spi;
	133
1da177e4 LT	134	read_lock_bh(&xfrm6_tunnel_spi_lock);
	135	x6spi = __xfrm6_tunnel_spi_lookup(saddr);
	136	spi = x6spi ? x6spi->spi : 0;
	137	read_unlock_bh(&xfrm6_tunnel_spi_lock);
5b122545	138	return htonl(spi);
1da177e4 LT	139	}
	140
	141	EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
	142
df8ea19b YH	143	static int __xfrm6_tunnel_spi_check(u32 spi)
	144	{
	145	struct xfrm6_tunnel_spi *x6spi;
	146	int index = xfrm6_tunnel_spi_hash_byspi(spi);
	147	struct hlist_node *pos;
	148
	149	hlist_for_each_entry(x6spi, pos,
	150	&xfrm6_tunnel_spi_byspi[index],
	151	list_byspi) {
	152	if (x6spi->spi == spi)
	153	return -1;
	154	}
	155	return index;
	156	}
	157
1da177e4 LT	158	static u32 __xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
	159	{
	160	u32 spi;
	161	struct xfrm6_tunnel_spi *x6spi;
df8ea19b	162	int index;
1da177e4	163
1da177e4 LT	164	if (xfrm6_tunnel_spi < XFRM6_TUNNEL_SPI_MIN \|\|
	165	xfrm6_tunnel_spi >= XFRM6_TUNNEL_SPI_MAX)
	166	xfrm6_tunnel_spi = XFRM6_TUNNEL_SPI_MIN;
	167	else
	168	xfrm6_tunnel_spi++;
	169
	170	for (spi = xfrm6_tunnel_spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
df8ea19b YH	171	index = __xfrm6_tunnel_spi_check(spi);
	172	if (index >= 0)
	173	goto alloc_spi;
1da177e4 LT	174	}
1da177e4 LT	175	for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tunnel_spi; spi++) {
df8ea19b YH	176	index = __xfrm6_tunnel_spi_check(spi);
	177	if (index >= 0)
	178	goto alloc_spi;
1da177e4 LT	179	}
	180	spi = 0;
	181	goto out;
	182	alloc_spi:
df8ea19b	183	xfrm6_tunnel_spi = spi;
54e6ecb2	184	x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, GFP_ATOMIC);
a922ba55	185	if (!x6spi)
1da177e4	186	goto out;
a922ba55	187
1da177e4 LT	188	memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
	189	x6spi->spi = spi;
	190	atomic_set(&x6spi->refcnt, 1);
	191
	192	hlist_add_head(&x6spi->list_byspi, &xfrm6_tunnel_spi_byspi[index]);
	193
	194	index = xfrm6_tunnel_spi_hash_byaddr(saddr);
	195	hlist_add_head(&x6spi->list_byaddr, &xfrm6_tunnel_spi_byaddr[index]);
1da177e4	196	out:
1da177e4 LT	197	return spi;
	198	}
	199
8c689a6e	200	__be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
1da177e4 LT	201	{
	202	struct xfrm6_tunnel_spi *x6spi;
	203	u32 spi;
	204
1da177e4 LT	205	write_lock_bh(&xfrm6_tunnel_spi_lock);
	206	x6spi = __xfrm6_tunnel_spi_lookup(saddr);
	207	if (x6spi) {
	208	atomic_inc(&x6spi->refcnt);
	209	spi = x6spi->spi;
	210	} else
	211	spi = __xfrm6_tunnel_alloc_spi(saddr);
	212	write_unlock_bh(&xfrm6_tunnel_spi_lock);
	213
5b122545	214	return htonl(spi);
1da177e4 LT	215	}
	216
	217	EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);
	218
	219	void xfrm6_tunnel_free_spi(xfrm_address_t *saddr)
	220	{
	221	struct xfrm6_tunnel_spi *x6spi;
	222	struct hlist_node pos, n;
	223
1da177e4 LT	224	write_lock_bh(&xfrm6_tunnel_spi_lock);
1da177e4 LT	225
1ab1457c	226	hlist_for_each_entry_safe(x6spi, pos, n,
1da177e4 LT	227	&xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
	228	list_byaddr)
	229	{
	230	if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0) {
1da177e4 LT	231	if (atomic_dec_and_test(&x6spi->refcnt)) {
	232	hlist_del(&x6spi->list_byaddr);
	233	hlist_del(&x6spi->list_byspi);
	234	kmem_cache_free(xfrm6_tunnel_spi_kmem, x6spi);
	235	break;
	236	}
	237	}
	238	}
	239	write_unlock_bh(&xfrm6_tunnel_spi_lock);
	240	}
	241
	242	EXPORT_SYMBOL(xfrm6_tunnel_free_spi);
	243
	244	static int xfrm6_tunnel_output(struct xfrm_state x, struct sk_buff skb)
	245	{
7b277b1a	246	skb_push(skb, -skb_network_offset(skb));
1da177e4 LT	247	return 0;
	248	}
	249
e695633e	250	static int xfrm6_tunnel_input(struct xfrm_state x, struct sk_buff skb)
1da177e4	251	{
04663d0b	252	return skb_network_header(skb)[IP6CB(skb)->nhoff];
1da177e4 LT	253	}
1da177e4 LT	254
d2acc347	255	static int xfrm6_tunnel_rcv(struct sk_buff *skb)
1da177e4	256	{
0660e03f	257	struct ipv6hdr *iph = ipv6_hdr(skb);
a252cc23	258	__be32 spi;
1da177e4	259
1da177e4	260	spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&iph->saddr);
33b5ecb8	261	return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi) > 0 ? : 0;
1da177e4 LT	262	}
1da177e4 LT	263
d2acc347	264	static int xfrm6_tunnel_err(struct sk_buff skb, struct inet6_skb_parm opt,
04ce6909	265	int type, int code, int offset, __be32 info)
1da177e4	266	{
1da177e4 LT	267	/* xfrm6_tunnel native err handling */
1da177e4 LT	268	switch (type) {
1ab1457c	269	case ICMPV6_DEST_UNREACH:
1da177e4	270	switch (code) {
1ab1457c	271	case ICMPV6_NOROUTE:
1da177e4 LT	272	case ICMPV6_ADM_PROHIBITED:
	273	case ICMPV6_NOT_NEIGHBOUR:
	274	case ICMPV6_ADDR_UNREACH:
	275	case ICMPV6_PORT_UNREACH:
	276	default:
1da177e4 LT	277	break;
	278	}
	279	break;
	280	case ICMPV6_PKT_TOOBIG:
1da177e4 LT	281	break;
	282	case ICMPV6_TIME_EXCEED:
	283	switch (code) {
	284	case ICMPV6_EXC_HOPLIMIT:
1da177e4 LT	285	break;
1da177e4 LT	286	case ICMPV6_EXC_FRAGTIME:
1ab1457c	287	default:
1da177e4 LT	288	break;
	289	}
	290	break;
	291	case ICMPV6_PARAMPROB:
	292	switch (code) {
	293	case ICMPV6_HDR_FIELD: break;
	294	case ICMPV6_UNK_NEXTHDR: break;
	295	case ICMPV6_UNK_OPTION: break;
	296	}
	297	break;
	298	default:
	299	break;
	300	}
d2acc347 HX	301
d2acc347 HX	302	return 0;
1da177e4 LT	303	}
1da177e4 LT	304
72cb6962	305	static int xfrm6_tunnel_init_state(struct xfrm_state *x)
1da177e4	306	{
7e49e6de	307	if (x->props.mode != XFRM_MODE_TUNNEL)
1da177e4 LT	308	return -EINVAL;
	309
	310	if (x->encap)
	311	return -EINVAL;
	312
	313	x->props.header_len = sizeof(struct ipv6hdr);
	314
	315	return 0;
	316	}
	317
	318	static void xfrm6_tunnel_destroy(struct xfrm_state *x)
	319	{
	320	xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
	321	}
	322
533cb5b0	323	static const struct xfrm_type xfrm6_tunnel_type = {
1da177e4 LT	324	.description = "IP6IP6",
	325	.owner = THIS_MODULE,
	326	.proto = IPPROTO_IPV6,
	327	.init_state = xfrm6_tunnel_init_state,
	328	.destructor = xfrm6_tunnel_destroy,
	329	.input = xfrm6_tunnel_input,
	330	.output = xfrm6_tunnel_output,
	331	};
	332
d2acc347	333	static struct xfrm6_tunnel xfrm6_tunnel_handler = {
1da177e4	334	.handler = xfrm6_tunnel_rcv,
d2acc347 HX	335	.err_handler = xfrm6_tunnel_err,
d2acc347 HX	336	.priority = 2,
1da177e4 LT	337	};
1da177e4 LT	338
73d605d1 KM	339	static struct xfrm6_tunnel xfrm46_tunnel_handler = {
	340	.handler = xfrm6_tunnel_rcv,
	341	.err_handler = xfrm6_tunnel_err,
	342	.priority = 2,
	343	};
	344
1da177e4 LT	345	static int __init xfrm6_tunnel_init(void)
1da177e4 LT	346	{
a922ba55	347	if (xfrm_register_type(&xfrm6_tunnel_type, AF_INET6) < 0)
1da177e4	348	return -EAGAIN;
a922ba55	349
73d605d1 KM	350	if (xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6)) {
	351	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
	352	return -EAGAIN;
	353	}
	354	if (xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET)) {
	355	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
1da177e4 LT	356	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
	357	return -EAGAIN;
	358	}
	359	if (xfrm6_tunnel_spi_init() < 0) {
73d605d1 KM	360	xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
73d605d1 KM	361	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
1da177e4 LT	362	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
	363	return -EAGAIN;
	364	}
	365	return 0;
	366	}
	367
	368	static void __exit xfrm6_tunnel_fini(void)
	369	{
1da177e4	370	xfrm6_tunnel_spi_fini();
73d605d1 KM	371	xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
73d605d1 KM	372	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
a922ba55	373	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
1da177e4 LT	374	}
	375
	376	module_init(xfrm6_tunnel_init);
	377	module_exit(xfrm6_tunnel_fini);
	378	MODULE_LICENSE("GPL");
d3d6dd3a	379	MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_IPV6);