[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  <[email protected]>
 * 		YOSHIFUJI Hideaki <[email protected]>
 *
 * 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 kmem_cache_t *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 unsigned inline xfrm6_tunnel_spi_hash_byaddr(xfrm_address_t *addr)
{
	unsigned h;

	h = 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 unsigned inline 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, 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;
}

u32 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 spi;
}

EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);

static u32 __xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
{
	u32 spi;
	struct xfrm6_tunnel_spi *x6spi;
	struct hlist_node *pos;
	unsigned 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_hash_byspi(spi);
		hlist_for_each_entry(x6spi, pos, 
				     &xfrm6_tunnel_spi_byspi[index], 
				     list_byspi) {
			if (x6spi->spi == spi)
				goto try_next_1;
		}
		xfrm6_tunnel_spi = spi;
		goto alloc_spi;
try_next_1:;
	}
	for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tunnel_spi; spi++) {
		index = xfrm6_tunnel_spi_hash_byspi(spi);
		hlist_for_each_entry(x6spi, pos, 
				     &xfrm6_tunnel_spi_byspi[index], 
				     list_byspi) {
			if (x6spi->spi == spi)
				goto try_next_2;
		}
		xfrm6_tunnel_spi = spi;
		goto alloc_spi;
try_next_2:;
	}
	spi = 0;
	goto out;
alloc_spi:
	x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, SLAB_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;
}

u32 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 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)
{
	struct ipv6hdr *top_iph;

	top_iph = (struct ipv6hdr *)skb->data;
	top_iph->payload_len = htons(skb->len - sizeof(struct ipv6hdr));

	return 0;
}

static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
{
	return 0;
}

static int xfrm6_tunnel_rcv(struct sk_buff *skb)
{
	struct ipv6hdr *iph = skb->nh.ipv6h;
	__be32 spi;

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

static int xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
			    int type, int code, int offset, __u32 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 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 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)) {
		xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
		return -EAGAIN;
	}
	if (xfrm6_tunnel_spi_init() < 0) {
		xfrm6_tunnel_deregister(&xfrm6_tunnel_handler);
		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(&xfrm6_tunnel_handler);
	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
}

module_init(xfrm6_tunnel_init);
module_exit(xfrm6_tunnel_fini);
MODULE_LICENSE("GPL");
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.
	8	*
	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.
	13	*
	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 <[email protected]>
	19	* YOSHIFUJI Hideaki <[email protected]>
	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 LT	34	/*
	35	* xfrm_tunnel_spi things are for allocating unique id ("spi")
	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
ba89966c	53	static kmem_cache_t *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
1da177e4 LT	61	static unsigned inline xfrm6_tunnel_spi_hash_byaddr(xfrm_address_t *addr)
	62	{
	63	unsigned h;
	64
1da177e4 LT	65	h = addr->a6[0] ^ addr->a6[1] ^ addr->a6[2] ^ addr->a6[3];
	66	h ^= h >> 16;
	67	h ^= h >> 8;
	68	h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;
	69
1da177e4 LT	70	return h;
	71	}
	72
	73	static unsigned inline xfrm6_tunnel_spi_hash_byspi(u32 spi)
	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,
	87	NULL, 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
	129	u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr)
	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);
	138	return spi;
	139	}
	140
	141	EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
	142
	143	static u32 __xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
	144	{
	145	u32 spi;
	146	struct xfrm6_tunnel_spi *x6spi;
	147	struct hlist_node *pos;
	148	unsigned index;
	149
1da177e4 LT	150	if (xfrm6_tunnel_spi < XFRM6_TUNNEL_SPI_MIN \|\|
	151	xfrm6_tunnel_spi >= XFRM6_TUNNEL_SPI_MAX)
	152	xfrm6_tunnel_spi = XFRM6_TUNNEL_SPI_MIN;
	153	else
	154	xfrm6_tunnel_spi++;
	155
	156	for (spi = xfrm6_tunnel_spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
	157	index = xfrm6_tunnel_spi_hash_byspi(spi);
	158	hlist_for_each_entry(x6spi, pos,
	159	&xfrm6_tunnel_spi_byspi[index],
	160	list_byspi) {
	161	if (x6spi->spi == spi)
	162	goto try_next_1;
	163	}
	164	xfrm6_tunnel_spi = spi;
	165	goto alloc_spi;
	166	try_next_1:;
	167	}
	168	for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tunnel_spi; spi++) {
	169	index = xfrm6_tunnel_spi_hash_byspi(spi);
	170	hlist_for_each_entry(x6spi, pos,
	171	&xfrm6_tunnel_spi_byspi[index],
	172	list_byspi) {
	173	if (x6spi->spi == spi)
	174	goto try_next_2;
	175	}
	176	xfrm6_tunnel_spi = spi;
	177	goto alloc_spi;
	178	try_next_2:;
	179	}
	180	spi = 0;
	181	goto out;
	182	alloc_spi:
1da177e4	183	x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, SLAB_ATOMIC);
a922ba55	184	if (!x6spi)
1da177e4	185	goto out;
a922ba55	186
1da177e4 LT	187	memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
	188	x6spi->spi = spi;
	189	atomic_set(&x6spi->refcnt, 1);
	190
	191	hlist_add_head(&x6spi->list_byspi, &xfrm6_tunnel_spi_byspi[index]);
	192
	193	index = xfrm6_tunnel_spi_hash_byaddr(saddr);
	194	hlist_add_head(&x6spi->list_byaddr, &xfrm6_tunnel_spi_byaddr[index]);
1da177e4	195	out:
1da177e4 LT	196	return spi;
	197	}
	198
	199	u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
	200	{
	201	struct xfrm6_tunnel_spi *x6spi;
	202	u32 spi;
	203
1da177e4 LT	204	write_lock_bh(&xfrm6_tunnel_spi_lock);
	205	x6spi = __xfrm6_tunnel_spi_lookup(saddr);
	206	if (x6spi) {
	207	atomic_inc(&x6spi->refcnt);
	208	spi = x6spi->spi;
	209	} else
	210	spi = __xfrm6_tunnel_alloc_spi(saddr);
	211	write_unlock_bh(&xfrm6_tunnel_spi_lock);
	212
1da177e4 LT	213	return spi;
	214	}
	215
	216	EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);
	217
	218	void xfrm6_tunnel_free_spi(xfrm_address_t *saddr)
	219	{
	220	struct xfrm6_tunnel_spi *x6spi;
	221	struct hlist_node pos, n;
	222
1da177e4 LT	223	write_lock_bh(&xfrm6_tunnel_spi_lock);
	224
	225	hlist_for_each_entry_safe(x6spi, pos, n,
	226	&xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
	227	list_byaddr)
	228	{
	229	if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0) {
1da177e4 LT	230	if (atomic_dec_and_test(&x6spi->refcnt)) {
	231	hlist_del(&x6spi->list_byaddr);
	232	hlist_del(&x6spi->list_byspi);
	233	kmem_cache_free(xfrm6_tunnel_spi_kmem, x6spi);
	234	break;
	235	}
	236	}
	237	}
	238	write_unlock_bh(&xfrm6_tunnel_spi_lock);
	239	}
	240
	241	EXPORT_SYMBOL(xfrm6_tunnel_free_spi);
	242
	243	static int xfrm6_tunnel_output(struct xfrm_state x, struct sk_buff skb)
	244	{
	245	struct ipv6hdr *top_iph;
	246
	247	top_iph = (struct ipv6hdr *)skb->data;
	248	top_iph->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
	249
	250	return 0;
	251	}
	252
e695633e	253	static int xfrm6_tunnel_input(struct xfrm_state x, struct sk_buff skb)
1da177e4 LT	254	{
	255	return 0;
	256	}
	257
d2acc347	258	static int xfrm6_tunnel_rcv(struct sk_buff *skb)
1da177e4	259	{
1da177e4	260	struct ipv6hdr *iph = skb->nh.ipv6h;
a252cc23	261	__be32 spi;
1da177e4	262
1da177e4	263	spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&iph->saddr);
d2acc347	264	return xfrm6_rcv_spi(skb, spi);
1da177e4 LT	265	}
1da177e4 LT	266
d2acc347 HX	267	static int xfrm6_tunnel_err(struct sk_buff skb, struct inet6_skb_parm opt,
d2acc347 HX	268	int type, int code, int offset, __u32 info)
1da177e4	269	{
1da177e4 LT	270	/* xfrm6_tunnel native err handling */
	271	switch (type) {
	272	case ICMPV6_DEST_UNREACH:
	273	switch (code) {
	274	case ICMPV6_NOROUTE:
	275	case ICMPV6_ADM_PROHIBITED:
	276	case ICMPV6_NOT_NEIGHBOUR:
	277	case ICMPV6_ADDR_UNREACH:
	278	case ICMPV6_PORT_UNREACH:
	279	default:
1da177e4 LT	280	break;
	281	}
	282	break;
	283	case ICMPV6_PKT_TOOBIG:
1da177e4 LT	284	break;
	285	case ICMPV6_TIME_EXCEED:
	286	switch (code) {
	287	case ICMPV6_EXC_HOPLIMIT:
1da177e4 LT	288	break;
	289	case ICMPV6_EXC_FRAGTIME:
	290	default:
	291	break;
	292	}
	293	break;
	294	case ICMPV6_PARAMPROB:
	295	switch (code) {
	296	case ICMPV6_HDR_FIELD: break;
	297	case ICMPV6_UNK_NEXTHDR: break;
	298	case ICMPV6_UNK_OPTION: break;
	299	}
	300	break;
	301	default:
	302	break;
	303	}
d2acc347 HX	304
d2acc347 HX	305	return 0;
1da177e4 LT	306	}
1da177e4 LT	307
72cb6962	308	static int xfrm6_tunnel_init_state(struct xfrm_state *x)
1da177e4	309	{
7e49e6de	310	if (x->props.mode != XFRM_MODE_TUNNEL)
1da177e4 LT	311	return -EINVAL;
	312
	313	if (x->encap)
	314	return -EINVAL;
	315
	316	x->props.header_len = sizeof(struct ipv6hdr);
	317
	318	return 0;
	319	}
	320
	321	static void xfrm6_tunnel_destroy(struct xfrm_state *x)
	322	{
	323	xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
	324	}
	325
	326	static struct xfrm_type xfrm6_tunnel_type = {
	327	.description = "IP6IP6",
	328	.owner = THIS_MODULE,
	329	.proto = IPPROTO_IPV6,
	330	.init_state = xfrm6_tunnel_init_state,
	331	.destructor = xfrm6_tunnel_destroy,
	332	.input = xfrm6_tunnel_input,
	333	.output = xfrm6_tunnel_output,
	334	};
	335
d2acc347	336	static struct xfrm6_tunnel xfrm6_tunnel_handler = {
1da177e4	337	.handler = xfrm6_tunnel_rcv,
d2acc347 HX	338	.err_handler = xfrm6_tunnel_err,
d2acc347 HX	339	.priority = 2,
1da177e4 LT	340	};
	341
	342	static int __init xfrm6_tunnel_init(void)
	343	{
a922ba55	344	if (xfrm_register_type(&xfrm6_tunnel_type, AF_INET6) < 0)
1da177e4	345	return -EAGAIN;
a922ba55	346
d2acc347	347	if (xfrm6_tunnel_register(&xfrm6_tunnel_handler)) {
1da177e4 LT	348	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
	349	return -EAGAIN;
	350	}
	351	if (xfrm6_tunnel_spi_init() < 0) {
d2acc347	352	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler);
1da177e4 LT	353	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
	354	return -EAGAIN;
	355	}
	356	return 0;
	357	}
	358
	359	static void __exit xfrm6_tunnel_fini(void)
	360	{
1da177e4	361	xfrm6_tunnel_spi_fini();
a922ba55 DM	362	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler);
a922ba55 DM	363	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
1da177e4 LT	364	}
	365
	366	module_init(xfrm6_tunnel_init);
	367	module_exit(xfrm6_tunnel_fini);
	368	MODULE_LICENSE("GPL");