[mirror_ubuntu-jammy-kernel.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>
#include <net/netns/generic.h>

#define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
#define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256

#define XFRM6_TUNNEL_SPI_MIN	1
#define XFRM6_TUNNEL_SPI_MAX	0xffffffff

struct xfrm6_tunnel_net {
	struct hlist_head spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
	struct hlist_head spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];
	u32 spi;
};

static int xfrm6_tunnel_net_id __read_mostly;
static inline struct xfrm6_tunnel_net *xfrm6_tunnel_pernet(struct net *net)
{
	return net_generic(net, xfrm6_tunnel_net_id);
}

/*
 * 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 struct kmem_cache *xfrm6_tunnel_spi_kmem __read_mostly;

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 struct xfrm6_tunnel_spi *__xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr)
{
	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
	struct xfrm6_tunnel_spi *x6spi;
	struct hlist_node *pos;

	hlist_for_each_entry_rcu(x6spi, pos,
			     &xfrm6_tn->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(struct net *net, xfrm_address_t *saddr)
{
	struct xfrm6_tunnel_spi *x6spi;
	u32 spi;

	rcu_read_lock_bh();
	x6spi = __xfrm6_tunnel_spi_lookup(net, 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(struct net *net, u32 spi)
{
	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
	struct xfrm6_tunnel_spi *x6spi;
	int index = xfrm6_tunnel_spi_hash_byspi(spi);
	struct hlist_node *pos;

	hlist_for_each_entry(x6spi, pos,
			     &xfrm6_tn->spi_byspi[index],
			     list_byspi) {
		if (x6spi->spi == spi)
			return -1;
	}
	return index;
}

static u32 __xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr)
{
	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
	u32 spi;
	struct xfrm6_tunnel_spi *x6spi;
	int index;

	if (xfrm6_tn->spi < XFRM6_TUNNEL_SPI_MIN ||
	    xfrm6_tn->spi >= XFRM6_TUNNEL_SPI_MAX)
		xfrm6_tn->spi = XFRM6_TUNNEL_SPI_MIN;
	else
		xfrm6_tn->spi++;

	for (spi = xfrm6_tn->spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
		index = __xfrm6_tunnel_spi_check(net, spi);
		if (index >= 0)
			goto alloc_spi;
	}
	for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tn->spi; spi++) {
		index = __xfrm6_tunnel_spi_check(net, spi);
		if (index >= 0)
			goto alloc_spi;
	}
	spi = 0;
	goto out;
alloc_spi:
	xfrm6_tn->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_rcu(&x6spi->list_byspi, &xfrm6_tn->spi_byspi[index]);

	index = xfrm6_tunnel_spi_hash_byaddr(saddr);
	hlist_add_head_rcu(&x6spi->list_byaddr, &xfrm6_tn->spi_byaddr[index]);
out:
	return spi;
}

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

	spin_lock_bh(&xfrm6_tunnel_spi_lock);
	x6spi = __xfrm6_tunnel_spi_lookup(net, saddr);
	if (x6spi) {
		atomic_inc(&x6spi->refcnt);
		spi = x6spi->spi;
	} else
		spi = __xfrm6_tunnel_alloc_spi(net, 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(struct net *net, xfrm_address_t *saddr)
{
	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
	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_tn->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 net *net = dev_net(skb->dev);
	struct ipv6hdr *iph = ipv6_hdr(skb);
	__be32 spi;

	spi = xfrm6_tunnel_spi_lookup(net, (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)
{
	struct net *net = xs_net(x);

	xfrm6_tunnel_free_spi(net, (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 __net_init xfrm6_tunnel_net_init(struct net *net)
{
	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
	unsigned int i;

	for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
		INIT_HLIST_HEAD(&xfrm6_tn->spi_byaddr[i]);
	for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
		INIT_HLIST_HEAD(&xfrm6_tn->spi_byspi[i]);
	xfrm6_tn->spi = 0;

	return 0;
}

static void __net_exit xfrm6_tunnel_net_exit(struct net *net)
{
}

static struct pernet_operations xfrm6_tunnel_net_ops = {
	.init	= xfrm6_tunnel_net_init,
	.exit	= xfrm6_tunnel_net_exit,
	.id	= &xfrm6_tunnel_net_id,
	.size	= sizeof(struct xfrm6_tunnel_net),
};

static int __init xfrm6_tunnel_init(void)
{
	int rv;

	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;
	rv = register_pernet_subsys(&xfrm6_tunnel_net_ops);
	if (rv < 0)
		goto out_pernet;
	rv = xfrm_register_type(&xfrm6_tunnel_type, AF_INET6);
	if (rv < 0)
		goto out_type;
	rv = xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6);
	if (rv < 0)
		goto out_xfrm6;
	rv = xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET);
	if (rv < 0)
		goto out_xfrm46;
	return 0;

out_xfrm46:
	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
out_xfrm6:
	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
out_type:
	unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
out_pernet:
	kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
	return rv;
}

static void __exit xfrm6_tunnel_fini(void)
{
	xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
	unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
	kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
}

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>
a1664773 AD	33	#include <net/netns/generic.h>
	34
	35	#define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
	36	#define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
	37
	38	#define XFRM6_TUNNEL_SPI_MIN 1
	39	#define XFRM6_TUNNEL_SPI_MAX 0xffffffff
	40
	41	struct xfrm6_tunnel_net {
	42	struct hlist_head spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
	43	struct hlist_head spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];
	44	u32 spi;
	45	};
	46
	47	static int xfrm6_tunnel_net_id __read_mostly;
	48	static inline struct xfrm6_tunnel_net xfrm6_tunnel_pernet(struct net net)
	49	{
	50	return net_generic(net, xfrm6_tunnel_net_id);
	51	}
1da177e4	52
1da177e4	53	/*
1ab1457c	54	* xfrm_tunnel_spi things are for allocating unique id ("spi")
1da177e4 LT	55	* per xfrm_address_t.
	56	*/
	57	struct xfrm6_tunnel_spi {
91cc3bb0 ED	58	struct hlist_node list_byaddr;
	59	struct hlist_node list_byspi;
	60	xfrm_address_t addr;
	61	u32 spi;
	62	atomic_t refcnt;
	63	struct rcu_head rcu_head;
1da177e4 LT	64	};
1da177e4 LT	65
91cc3bb0	66	static DEFINE_SPINLOCK(xfrm6_tunnel_spi_lock);
1da177e4	67
e18b890b	68	static struct kmem_cache *xfrm6_tunnel_spi_kmem __read_mostly;
1da177e4	69
b6f99a21	70	static inline unsigned xfrm6_tunnel_spi_hash_byaddr(xfrm_address_t *addr)
1da177e4 LT	71	{
	72	unsigned h;
	73
8c689a6e	74	h = (__force u32)(addr->a6[0] ^ addr->a6[1] ^ addr->a6[2] ^ addr->a6[3]);
1da177e4 LT	75	h ^= h >> 16;
	76	h ^= h >> 8;
	77	h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;
	78
1da177e4 LT	79	return h;
	80	}
	81
b6f99a21	82	static inline unsigned xfrm6_tunnel_spi_hash_byspi(u32 spi)
1da177e4 LT	83	{
	84	return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
	85	}
	86
a1664773	87	static struct xfrm6_tunnel_spi __xfrm6_tunnel_spi_lookup(struct net net, xfrm_address_t *saddr)
1da177e4	88	{
a1664773	89	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
1da177e4 LT	90	struct xfrm6_tunnel_spi *x6spi;
	91	struct hlist_node *pos;
	92
91cc3bb0	93	hlist_for_each_entry_rcu(x6spi, pos,
a1664773	94	&xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
1da177e4	95	list_byaddr) {
a922ba55	96	if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0)
1da177e4	97	return x6spi;
1da177e4 LT	98	}
1da177e4 LT	99
1da177e4 LT	100	return NULL;
	101	}
	102
a1664773	103	__be32 xfrm6_tunnel_spi_lookup(struct net net, xfrm_address_t saddr)
1da177e4 LT	104	{
	105	struct xfrm6_tunnel_spi *x6spi;
	106	u32 spi;
	107
91cc3bb0	108	rcu_read_lock_bh();
a1664773	109	x6spi = __xfrm6_tunnel_spi_lookup(net, saddr);
1da177e4	110	spi = x6spi ? x6spi->spi : 0;
91cc3bb0	111	rcu_read_unlock_bh();
5b122545	112	return htonl(spi);
1da177e4 LT	113	}
	114
	115	EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
	116
a1664773	117	static int __xfrm6_tunnel_spi_check(struct net *net, u32 spi)
df8ea19b	118	{
a1664773	119	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
df8ea19b YH	120	struct xfrm6_tunnel_spi *x6spi;
	121	int index = xfrm6_tunnel_spi_hash_byspi(spi);
	122	struct hlist_node *pos;
	123
	124	hlist_for_each_entry(x6spi, pos,
a1664773	125	&xfrm6_tn->spi_byspi[index],
df8ea19b YH	126	list_byspi) {
	127	if (x6spi->spi == spi)
	128	return -1;
	129	}
	130	return index;
	131	}
	132
a1664773	133	static u32 __xfrm6_tunnel_alloc_spi(struct net net, xfrm_address_t saddr)
1da177e4	134	{
a1664773	135	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
1da177e4 LT	136	u32 spi;
1da177e4 LT	137	struct xfrm6_tunnel_spi *x6spi;
df8ea19b	138	int index;
1da177e4	139
a1664773 AD	140	if (xfrm6_tn->spi < XFRM6_TUNNEL_SPI_MIN \|\|
	141	xfrm6_tn->spi >= XFRM6_TUNNEL_SPI_MAX)
	142	xfrm6_tn->spi = XFRM6_TUNNEL_SPI_MIN;
1da177e4	143	else
a1664773	144	xfrm6_tn->spi++;
1da177e4	145
a1664773 AD	146	for (spi = xfrm6_tn->spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
a1664773 AD	147	index = __xfrm6_tunnel_spi_check(net, spi);
df8ea19b YH	148	if (index >= 0)
df8ea19b YH	149	goto alloc_spi;
1da177e4	150	}
a1664773 AD	151	for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tn->spi; spi++) {
a1664773 AD	152	index = __xfrm6_tunnel_spi_check(net, spi);
df8ea19b YH	153	if (index >= 0)
df8ea19b YH	154	goto alloc_spi;
1da177e4 LT	155	}
	156	spi = 0;
	157	goto out;
	158	alloc_spi:
a1664773	159	xfrm6_tn->spi = spi;
54e6ecb2	160	x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, GFP_ATOMIC);
a922ba55	161	if (!x6spi)
1da177e4	162	goto out;
a922ba55	163
1da177e4 LT	164	memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
	165	x6spi->spi = spi;
	166	atomic_set(&x6spi->refcnt, 1);
	167
a1664773	168	hlist_add_head_rcu(&x6spi->list_byspi, &xfrm6_tn->spi_byspi[index]);
1da177e4 LT	169
1da177e4 LT	170	index = xfrm6_tunnel_spi_hash_byaddr(saddr);
a1664773	171	hlist_add_head_rcu(&x6spi->list_byaddr, &xfrm6_tn->spi_byaddr[index]);
1da177e4	172	out:
1da177e4 LT	173	return spi;
	174	}
	175
a1664773	176	__be32 xfrm6_tunnel_alloc_spi(struct net net, xfrm_address_t saddr)
1da177e4 LT	177	{
	178	struct xfrm6_tunnel_spi *x6spi;
	179	u32 spi;
	180
91cc3bb0	181	spin_lock_bh(&xfrm6_tunnel_spi_lock);
a1664773	182	x6spi = __xfrm6_tunnel_spi_lookup(net, saddr);
1da177e4 LT	183	if (x6spi) {
	184	atomic_inc(&x6spi->refcnt);
	185	spi = x6spi->spi;
	186	} else
a1664773	187	spi = __xfrm6_tunnel_alloc_spi(net, saddr);
91cc3bb0	188	spin_unlock_bh(&xfrm6_tunnel_spi_lock);
1da177e4	189
5b122545	190	return htonl(spi);
1da177e4 LT	191	}
	192
	193	EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);
	194
91cc3bb0 ED	195	static void x6spi_destroy_rcu(struct rcu_head *head)
	196	{
	197	kmem_cache_free(xfrm6_tunnel_spi_kmem,
	198	container_of(head, struct xfrm6_tunnel_spi, rcu_head));
	199	}
	200
a1664773	201	void xfrm6_tunnel_free_spi(struct net net, xfrm_address_t saddr)
1da177e4	202	{
a1664773	203	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
1da177e4 LT	204	struct xfrm6_tunnel_spi *x6spi;
	205	struct hlist_node pos, n;
	206
91cc3bb0	207	spin_lock_bh(&xfrm6_tunnel_spi_lock);
1da177e4	208
1ab1457c	209	hlist_for_each_entry_safe(x6spi, pos, n,
a1664773	210	&xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
1da177e4 LT	211	list_byaddr)
	212	{
	213	if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0) {
1da177e4	214	if (atomic_dec_and_test(&x6spi->refcnt)) {
91cc3bb0 ED	215	hlist_del_rcu(&x6spi->list_byaddr);
	216	hlist_del_rcu(&x6spi->list_byspi);
	217	call_rcu(&x6spi->rcu_head, x6spi_destroy_rcu);
1da177e4 LT	218	break;
	219	}
	220	}
	221	}
91cc3bb0	222	spin_unlock_bh(&xfrm6_tunnel_spi_lock);
1da177e4 LT	223	}
	224
	225	EXPORT_SYMBOL(xfrm6_tunnel_free_spi);
	226
	227	static int xfrm6_tunnel_output(struct xfrm_state x, struct sk_buff skb)
	228	{
7b277b1a	229	skb_push(skb, -skb_network_offset(skb));
1da177e4 LT	230	return 0;
	231	}
	232
e695633e	233	static int xfrm6_tunnel_input(struct xfrm_state x, struct sk_buff skb)
1da177e4	234	{
04663d0b	235	return skb_network_header(skb)[IP6CB(skb)->nhoff];
1da177e4 LT	236	}
1da177e4 LT	237
d2acc347	238	static int xfrm6_tunnel_rcv(struct sk_buff *skb)
1da177e4	239	{
a1664773	240	struct net *net = dev_net(skb->dev);
0660e03f	241	struct ipv6hdr *iph = ipv6_hdr(skb);
a252cc23	242	__be32 spi;
1da177e4	243
a1664773	244	spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&iph->saddr);
33b5ecb8	245	return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi) > 0 ? : 0;
1da177e4 LT	246	}
1da177e4 LT	247
d2acc347	248	static int xfrm6_tunnel_err(struct sk_buff skb, struct inet6_skb_parm opt,
d5fdd6ba	249	u8 type, u8 code, int offset, __be32 info)
1da177e4	250	{
1da177e4 LT	251	/* xfrm6_tunnel native err handling */
1da177e4 LT	252	switch (type) {
1ab1457c	253	case ICMPV6_DEST_UNREACH:
1da177e4	254	switch (code) {
1ab1457c	255	case ICMPV6_NOROUTE:
1da177e4 LT	256	case ICMPV6_ADM_PROHIBITED:
	257	case ICMPV6_NOT_NEIGHBOUR:
	258	case ICMPV6_ADDR_UNREACH:
	259	case ICMPV6_PORT_UNREACH:
	260	default:
1da177e4 LT	261	break;
	262	}
	263	break;
	264	case ICMPV6_PKT_TOOBIG:
1da177e4 LT	265	break;
	266	case ICMPV6_TIME_EXCEED:
	267	switch (code) {
	268	case ICMPV6_EXC_HOPLIMIT:
1da177e4 LT	269	break;
1da177e4 LT	270	case ICMPV6_EXC_FRAGTIME:
1ab1457c	271	default:
1da177e4 LT	272	break;
	273	}
	274	break;
	275	case ICMPV6_PARAMPROB:
	276	switch (code) {
	277	case ICMPV6_HDR_FIELD: break;
	278	case ICMPV6_UNK_NEXTHDR: break;
	279	case ICMPV6_UNK_OPTION: break;
	280	}
	281	break;
	282	default:
	283	break;
	284	}
d2acc347 HX	285
d2acc347 HX	286	return 0;
1da177e4 LT	287	}
1da177e4 LT	288
72cb6962	289	static int xfrm6_tunnel_init_state(struct xfrm_state *x)
1da177e4	290	{
7e49e6de	291	if (x->props.mode != XFRM_MODE_TUNNEL)
1da177e4 LT	292	return -EINVAL;
	293
	294	if (x->encap)
	295	return -EINVAL;
	296
	297	x->props.header_len = sizeof(struct ipv6hdr);
	298
	299	return 0;
	300	}
	301
	302	static void xfrm6_tunnel_destroy(struct xfrm_state *x)
	303	{
a1664773 AD	304	struct net *net = xs_net(x);
	305
	306	xfrm6_tunnel_free_spi(net, (xfrm_address_t *)&x->props.saddr);
1da177e4 LT	307	}
1da177e4 LT	308
533cb5b0	309	static const struct xfrm_type xfrm6_tunnel_type = {
1da177e4 LT	310	.description = "IP6IP6",
	311	.owner = THIS_MODULE,
	312	.proto = IPPROTO_IPV6,
	313	.init_state = xfrm6_tunnel_init_state,
	314	.destructor = xfrm6_tunnel_destroy,
	315	.input = xfrm6_tunnel_input,
	316	.output = xfrm6_tunnel_output,
	317	};
	318
d2acc347	319	static struct xfrm6_tunnel xfrm6_tunnel_handler = {
1da177e4	320	.handler = xfrm6_tunnel_rcv,
d2acc347 HX	321	.err_handler = xfrm6_tunnel_err,
d2acc347 HX	322	.priority = 2,
1da177e4 LT	323	};
1da177e4 LT	324
73d605d1 KM	325	static struct xfrm6_tunnel xfrm46_tunnel_handler = {
	326	.handler = xfrm6_tunnel_rcv,
	327	.err_handler = xfrm6_tunnel_err,
	328	.priority = 2,
	329	};
	330
a1664773 AD	331	static int __net_init xfrm6_tunnel_net_init(struct net *net)
	332	{
	333	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
	334	unsigned int i;
	335
	336	for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
	337	INIT_HLIST_HEAD(&xfrm6_tn->spi_byaddr[i]);
	338	for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
	339	INIT_HLIST_HEAD(&xfrm6_tn->spi_byspi[i]);
	340	xfrm6_tn->spi = 0;
	341
	342	return 0;
	343	}
	344
	345	static void __net_exit xfrm6_tunnel_net_exit(struct net *net)
	346	{
	347	}
	348
	349	static struct pernet_operations xfrm6_tunnel_net_ops = {
	350	.init = xfrm6_tunnel_net_init,
	351	.exit = xfrm6_tunnel_net_exit,
	352	.id = &xfrm6_tunnel_net_id,
	353	.size = sizeof(struct xfrm6_tunnel_net),
	354	};
	355
1da177e4 LT	356	static int __init xfrm6_tunnel_init(void)
1da177e4 LT	357	{
e924960d AD	358	int rv;
e924960d AD	359
d5aa407f AD	360	xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi",
	361	sizeof(struct xfrm6_tunnel_spi),
	362	0, SLAB_HWCACHE_ALIGN,
	363	NULL);
	364	if (!xfrm6_tunnel_spi_kmem)
	365	return -ENOMEM;
	366	rv = register_pernet_subsys(&xfrm6_tunnel_net_ops);
	367	if (rv < 0)
	368	goto out_pernet;
e924960d AD	369	rv = xfrm_register_type(&xfrm6_tunnel_type, AF_INET6);
e924960d AD	370	if (rv < 0)
d5aa407f	371	goto out_type;
e924960d AD	372	rv = xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6);
e924960d AD	373	if (rv < 0)
d5aa407f	374	goto out_xfrm6;
e924960d AD	375	rv = xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET);
e924960d AD	376	if (rv < 0)
d5aa407f	377	goto out_xfrm46;
1da177e4	378	return 0;
5ce1bbb9	379
d5aa407f	380	out_xfrm46:
5ce1bbb9	381	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
d5aa407f	382	out_xfrm6:
5ce1bbb9	383	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
d5aa407f AD	384	out_type:
	385	unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
	386	out_pernet:
	387	kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
e924960d	388	return rv;
1da177e4 LT	389	}
	390
	391	static void __exit xfrm6_tunnel_fini(void)
	392	{
73d605d1 KM	393	xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
73d605d1 KM	394	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
a922ba55	395	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
d5aa407f AD	396	unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
d5aa407f AD	397	kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
1da177e4 LT	398	}
	399
	400	module_init(xfrm6_tunnel_init);
	401	module_exit(xfrm6_tunnel_fini);
	402	MODULE_LICENSE("GPL");
d3d6dd3a	403	MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_IPV6);