[mirror_ubuntu-zesty-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/slab.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 int xfrm6_tunnel_spi_hash_byaddr(const xfrm_address_t *addr)
{
	unsigned int h;

	h = ipv6_addr_hash((const struct in6_addr *)addr);
	h ^= h >> 16;
	h ^= h >> 8;
	h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;

	return h;
}

static inline unsigned int 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, const xfrm_address_t *saddr)
{
	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
	struct xfrm6_tunnel_spi *x6spi;

	hlist_for_each_entry_rcu(x6spi,
			     &xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
			     list_byaddr) {
		if (xfrm6_addr_equal(&x6spi->addr, saddr))
			return x6spi;
	}

	return NULL;
}

__be32 xfrm6_tunnel_spi_lookup(struct net *net, const 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);

	hlist_for_each_entry(x6spi,
			     &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));
}

static 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 *n;

	spin_lock_bh(&xfrm6_tunnel_spi_lock);

	hlist_for_each_entry_safe(x6spi, n,
				  &xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
				  list_byaddr)
	{
		if (xfrm6_addr_equal(&x6spi->addr, saddr)) {
			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);
}

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);
	const struct ipv6hdr *iph = ipv6_hdr(skb);
	__be32 spi;

	spi = xfrm6_tunnel_spi_lookup(net, (const xfrm_address_t *)&iph->saddr);
	return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi);
}

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 __read_mostly = {
	.handler	= xfrm6_tunnel_rcv,
	.err_handler	= xfrm6_tunnel_err,
	.priority	= 2,
};

static struct xfrm6_tunnel xfrm46_tunnel_handler __read_mostly = {
	.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>
5a0e3ad6	26	#include <linux/slab.h>
91cc3bb0	27	#include <linux/rculist.h>
1da177e4 LT	28	#include <net/ip.h>
	29	#include <net/xfrm.h>
	30	#include <net/ipv6.h>
1da177e4 LT	31	#include <linux/ipv6.h>
1da177e4 LT	32	#include <linux/icmpv6.h>
4a3e2f71	33	#include <linux/mutex.h>
a1664773 AD	34	#include <net/netns/generic.h>
	35
	36	#define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
	37	#define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
	38
	39	#define XFRM6_TUNNEL_SPI_MIN 1
	40	#define XFRM6_TUNNEL_SPI_MAX 0xffffffff
	41
	42	struct xfrm6_tunnel_net {
	43	struct hlist_head spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
	44	struct hlist_head spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];
	45	u32 spi;
	46	};
	47
	48	static int xfrm6_tunnel_net_id __read_mostly;
	49	static inline struct xfrm6_tunnel_net xfrm6_tunnel_pernet(struct net net)
	50	{
	51	return net_generic(net, xfrm6_tunnel_net_id);
	52	}
1da177e4	53
1da177e4	54	/*
1ab1457c	55	* xfrm_tunnel_spi things are for allocating unique id ("spi")
1da177e4 LT	56	* per xfrm_address_t.
	57	*/
	58	struct xfrm6_tunnel_spi {
91cc3bb0 ED	59	struct hlist_node list_byaddr;
	60	struct hlist_node list_byspi;
	61	xfrm_address_t addr;
	62	u32 spi;
	63	atomic_t refcnt;
	64	struct rcu_head rcu_head;
1da177e4 LT	65	};
1da177e4 LT	66
91cc3bb0	67	static DEFINE_SPINLOCK(xfrm6_tunnel_spi_lock);
1da177e4	68
e18b890b	69	static struct kmem_cache *xfrm6_tunnel_spi_kmem __read_mostly;
1da177e4	70
95c96174	71	static inline unsigned int xfrm6_tunnel_spi_hash_byaddr(const xfrm_address_t *addr)
1da177e4	72	{
95c96174	73	unsigned int h;
1da177e4	74
2b464f61	75	h = ipv6_addr_hash((const struct in6_addr *)addr);
1da177e4 LT	76	h ^= h >> 16;
	77	h ^= h >> 8;
	78	h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;
	79
1da177e4 LT	80	return h;
	81	}
	82
95c96174	83	static inline unsigned int xfrm6_tunnel_spi_hash_byspi(u32 spi)
1da177e4 LT	84	{
	85	return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
	86	}
	87
b71d1d42	88	static struct xfrm6_tunnel_spi __xfrm6_tunnel_spi_lookup(struct net net, const xfrm_address_t *saddr)
1da177e4	89	{
a1664773	90	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
1da177e4	91	struct xfrm6_tunnel_spi *x6spi;
1da177e4	92
b67bfe0d	93	hlist_for_each_entry_rcu(x6spi,
a1664773	94	&xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
1da177e4	95	list_byaddr) {
ff88b30c	96	if (xfrm6_addr_equal(&x6spi->addr, saddr))
1da177e4	97	return x6spi;
1da177e4 LT	98	}
1da177e4 LT	99
1da177e4 LT	100	return NULL;
	101	}
	102
b71d1d42	103	__be32 xfrm6_tunnel_spi_lookup(struct net net, const 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;
df8ea19b YH	121	int index = xfrm6_tunnel_spi_hash_byspi(spi);
df8ea19b	122
b67bfe0d	123	hlist_for_each_entry(x6spi,
a1664773	124	&xfrm6_tn->spi_byspi[index],
df8ea19b YH	125	list_byspi) {
	126	if (x6spi->spi == spi)
	127	return -1;
	128	}
	129	return index;
	130	}
	131
a1664773	132	static u32 __xfrm6_tunnel_alloc_spi(struct net net, xfrm_address_t saddr)
1da177e4	133	{
a1664773	134	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
1da177e4 LT	135	u32 spi;
1da177e4 LT	136	struct xfrm6_tunnel_spi *x6spi;
df8ea19b	137	int index;
1da177e4	138
a1664773 AD	139	if (xfrm6_tn->spi < XFRM6_TUNNEL_SPI_MIN \|\|
	140	xfrm6_tn->spi >= XFRM6_TUNNEL_SPI_MAX)
	141	xfrm6_tn->spi = XFRM6_TUNNEL_SPI_MIN;
1da177e4	142	else
a1664773	143	xfrm6_tn->spi++;
1da177e4	144
a1664773 AD	145	for (spi = xfrm6_tn->spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
a1664773 AD	146	index = __xfrm6_tunnel_spi_check(net, spi);
df8ea19b YH	147	if (index >= 0)
df8ea19b YH	148	goto alloc_spi;
1da177e4	149	}
a1664773 AD	150	for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tn->spi; spi++) {
a1664773 AD	151	index = __xfrm6_tunnel_spi_check(net, spi);
df8ea19b YH	152	if (index >= 0)
df8ea19b YH	153	goto alloc_spi;
1da177e4 LT	154	}
	155	spi = 0;
	156	goto out;
	157	alloc_spi:
a1664773	158	xfrm6_tn->spi = spi;
54e6ecb2	159	x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, GFP_ATOMIC);
a922ba55	160	if (!x6spi)
1da177e4	161	goto out;
a922ba55	162
1da177e4 LT	163	memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
	164	x6spi->spi = spi;
	165	atomic_set(&x6spi->refcnt, 1);
	166
a1664773	167	hlist_add_head_rcu(&x6spi->list_byspi, &xfrm6_tn->spi_byspi[index]);
1da177e4 LT	168
1da177e4 LT	169	index = xfrm6_tunnel_spi_hash_byaddr(saddr);
a1664773	170	hlist_add_head_rcu(&x6spi->list_byaddr, &xfrm6_tn->spi_byaddr[index]);
1da177e4	171	out:
1da177e4 LT	172	return spi;
	173	}
	174
a1664773	175	__be32 xfrm6_tunnel_alloc_spi(struct net net, xfrm_address_t saddr)
1da177e4 LT	176	{
	177	struct xfrm6_tunnel_spi *x6spi;
	178	u32 spi;
	179
91cc3bb0	180	spin_lock_bh(&xfrm6_tunnel_spi_lock);
a1664773	181	x6spi = __xfrm6_tunnel_spi_lookup(net, saddr);
1da177e4 LT	182	if (x6spi) {
	183	atomic_inc(&x6spi->refcnt);
	184	spi = x6spi->spi;
	185	} else
a1664773	186	spi = __xfrm6_tunnel_alloc_spi(net, saddr);
91cc3bb0	187	spin_unlock_bh(&xfrm6_tunnel_spi_lock);
1da177e4	188
5b122545	189	return htonl(spi);
1da177e4 LT	190	}
	191
	192	EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);
	193
91cc3bb0 ED	194	static void x6spi_destroy_rcu(struct rcu_head *head)
	195	{
	196	kmem_cache_free(xfrm6_tunnel_spi_kmem,
	197	container_of(head, struct xfrm6_tunnel_spi, rcu_head));
	198	}
	199
6f747aca	200	static void xfrm6_tunnel_free_spi(struct net net, xfrm_address_t saddr)
1da177e4	201	{
a1664773	202	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
1da177e4	203	struct xfrm6_tunnel_spi *x6spi;
b67bfe0d	204	struct hlist_node *n;
1da177e4	205
91cc3bb0	206	spin_lock_bh(&xfrm6_tunnel_spi_lock);
1da177e4	207
b67bfe0d	208	hlist_for_each_entry_safe(x6spi, n,
a1664773	209	&xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
1da177e4 LT	210	list_byaddr)
1da177e4 LT	211	{
ff88b30c	212	if (xfrm6_addr_equal(&x6spi->addr, saddr)) {
1da177e4	213	if (atomic_dec_and_test(&x6spi->refcnt)) {
91cc3bb0 ED	214	hlist_del_rcu(&x6spi->list_byaddr);
	215	hlist_del_rcu(&x6spi->list_byspi);
	216	call_rcu(&x6spi->rcu_head, x6spi_destroy_rcu);
1da177e4 LT	217	break;
	218	}
	219	}
	220	}
91cc3bb0	221	spin_unlock_bh(&xfrm6_tunnel_spi_lock);
1da177e4 LT	222	}
1da177e4 LT	223
1da177e4 LT	224	static int xfrm6_tunnel_output(struct xfrm_state x, struct sk_buff skb)
1da177e4 LT	225	{
7b277b1a	226	skb_push(skb, -skb_network_offset(skb));
1da177e4 LT	227	return 0;
	228	}
	229
e695633e	230	static int xfrm6_tunnel_input(struct xfrm_state x, struct sk_buff skb)
1da177e4	231	{
04663d0b	232	return skb_network_header(skb)[IP6CB(skb)->nhoff];
1da177e4 LT	233	}
1da177e4 LT	234
d2acc347	235	static int xfrm6_tunnel_rcv(struct sk_buff *skb)
1da177e4	236	{
a1664773	237	struct net *net = dev_net(skb->dev);
b71d1d42	238	const struct ipv6hdr *iph = ipv6_hdr(skb);
a252cc23	239	__be32 spi;
1da177e4	240
b71d1d42	241	spi = xfrm6_tunnel_spi_lookup(net, (const xfrm_address_t *)&iph->saddr);
6ac3f664	242	return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi);
1da177e4 LT	243	}
1da177e4 LT	244
d2acc347	245	static int xfrm6_tunnel_err(struct sk_buff skb, struct inet6_skb_parm opt,
d5fdd6ba	246	u8 type, u8 code, int offset, __be32 info)
1da177e4	247	{
1da177e4 LT	248	/* xfrm6_tunnel native err handling */
1da177e4 LT	249	switch (type) {
1ab1457c	250	case ICMPV6_DEST_UNREACH:
1da177e4	251	switch (code) {
1ab1457c	252	case ICMPV6_NOROUTE:
1da177e4 LT	253	case ICMPV6_ADM_PROHIBITED:
	254	case ICMPV6_NOT_NEIGHBOUR:
	255	case ICMPV6_ADDR_UNREACH:
	256	case ICMPV6_PORT_UNREACH:
	257	default:
1da177e4 LT	258	break;
	259	}
	260	break;
	261	case ICMPV6_PKT_TOOBIG:
1da177e4 LT	262	break;
	263	case ICMPV6_TIME_EXCEED:
	264	switch (code) {
	265	case ICMPV6_EXC_HOPLIMIT:
1da177e4 LT	266	break;
1da177e4 LT	267	case ICMPV6_EXC_FRAGTIME:
1ab1457c	268	default:
1da177e4 LT	269	break;
	270	}
	271	break;
	272	case ICMPV6_PARAMPROB:
	273	switch (code) {
	274	case ICMPV6_HDR_FIELD: break;
	275	case ICMPV6_UNK_NEXTHDR: break;
	276	case ICMPV6_UNK_OPTION: break;
	277	}
	278	break;
	279	default:
	280	break;
	281	}
d2acc347 HX	282
d2acc347 HX	283	return 0;
1da177e4 LT	284	}
1da177e4 LT	285
72cb6962	286	static int xfrm6_tunnel_init_state(struct xfrm_state *x)
1da177e4	287	{
7e49e6de	288	if (x->props.mode != XFRM_MODE_TUNNEL)
1da177e4 LT	289	return -EINVAL;
	290
	291	if (x->encap)
	292	return -EINVAL;
	293
	294	x->props.header_len = sizeof(struct ipv6hdr);
	295
	296	return 0;
	297	}
	298
	299	static void xfrm6_tunnel_destroy(struct xfrm_state *x)
	300	{
a1664773 AD	301	struct net *net = xs_net(x);
	302
	303	xfrm6_tunnel_free_spi(net, (xfrm_address_t *)&x->props.saddr);
1da177e4 LT	304	}
1da177e4 LT	305
533cb5b0	306	static const struct xfrm_type xfrm6_tunnel_type = {
1da177e4 LT	307	.description = "IP6IP6",
	308	.owner = THIS_MODULE,
	309	.proto = IPPROTO_IPV6,
	310	.init_state = xfrm6_tunnel_init_state,
	311	.destructor = xfrm6_tunnel_destroy,
	312	.input = xfrm6_tunnel_input,
	313	.output = xfrm6_tunnel_output,
	314	};
	315
3ff2cfa5	316	static struct xfrm6_tunnel xfrm6_tunnel_handler __read_mostly = {
1da177e4	317	.handler = xfrm6_tunnel_rcv,
d2acc347 HX	318	.err_handler = xfrm6_tunnel_err,
d2acc347 HX	319	.priority = 2,
1da177e4 LT	320	};
1da177e4 LT	321
3ff2cfa5	322	static struct xfrm6_tunnel xfrm46_tunnel_handler __read_mostly = {
73d605d1 KM	323	.handler = xfrm6_tunnel_rcv,
	324	.err_handler = xfrm6_tunnel_err,
	325	.priority = 2,
	326	};
	327
a1664773 AD	328	static int __net_init xfrm6_tunnel_net_init(struct net *net)
	329	{
	330	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
	331	unsigned int i;
	332
	333	for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
	334	INIT_HLIST_HEAD(&xfrm6_tn->spi_byaddr[i]);
	335	for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
	336	INIT_HLIST_HEAD(&xfrm6_tn->spi_byspi[i]);
	337	xfrm6_tn->spi = 0;
	338
	339	return 0;
	340	}
	341
	342	static void __net_exit xfrm6_tunnel_net_exit(struct net *net)
	343	{
	344	}
	345
	346	static struct pernet_operations xfrm6_tunnel_net_ops = {
	347	.init = xfrm6_tunnel_net_init,
	348	.exit = xfrm6_tunnel_net_exit,
	349	.id = &xfrm6_tunnel_net_id,
	350	.size = sizeof(struct xfrm6_tunnel_net),
	351	};
	352
1da177e4 LT	353	static int __init xfrm6_tunnel_init(void)
1da177e4 LT	354	{
e924960d AD	355	int rv;
e924960d AD	356
d5aa407f AD	357	xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi",
	358	sizeof(struct xfrm6_tunnel_spi),
	359	0, SLAB_HWCACHE_ALIGN,
	360	NULL);
	361	if (!xfrm6_tunnel_spi_kmem)
	362	return -ENOMEM;
	363	rv = register_pernet_subsys(&xfrm6_tunnel_net_ops);
	364	if (rv < 0)
	365	goto out_pernet;
e924960d AD	366	rv = xfrm_register_type(&xfrm6_tunnel_type, AF_INET6);
e924960d AD	367	if (rv < 0)
d5aa407f	368	goto out_type;
e924960d AD	369	rv = xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6);
e924960d AD	370	if (rv < 0)
d5aa407f	371	goto out_xfrm6;
e924960d AD	372	rv = xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET);
e924960d AD	373	if (rv < 0)
d5aa407f	374	goto out_xfrm46;
1da177e4	375	return 0;
5ce1bbb9	376
d5aa407f	377	out_xfrm46:
5ce1bbb9	378	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
d5aa407f	379	out_xfrm6:
5ce1bbb9	380	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
d5aa407f AD	381	out_type:
	382	unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
	383	out_pernet:
	384	kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
e924960d	385	return rv;
1da177e4 LT	386	}
	387
	388	static void __exit xfrm6_tunnel_fini(void)
	389	{
73d605d1 KM	390	xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
73d605d1 KM	391	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
a922ba55	392	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
d5aa407f AD	393	unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
d5aa407f AD	394	kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
1da177e4 LT	395	}
	396
	397	module_init(xfrm6_tunnel_init);
	398	module_exit(xfrm6_tunnel_fini);
	399	MODULE_LICENSE("GPL");
d3d6dd3a	400	MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_IPV6);