2 * Copyright (C)2003,2004 USAGI/WIDE Project
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.
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.
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
18 * Authors Mitsuru KANDA <mk@linux-ipv6.org>
19 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
21 * Based on net/ipv4/xfrm4_tunnel.c
24 #include <linux/module.h>
25 #include <linux/xfrm.h>
26 #include <linux/rculist.h>
30 #include <linux/ipv6.h>
31 #include <linux/icmpv6.h>
32 #include <linux/mutex.h>
33 #include <net/netns/generic.h>
35 #define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
36 #define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
38 #define XFRM6_TUNNEL_SPI_MIN 1
39 #define XFRM6_TUNNEL_SPI_MAX 0xffffffff
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
];
47 static int xfrm6_tunnel_net_id __read_mostly
;
48 static inline struct xfrm6_tunnel_net
*xfrm6_tunnel_pernet(struct net
*net
)
50 return net_generic(net
, xfrm6_tunnel_net_id
);
54 * xfrm_tunnel_spi things are for allocating unique id ("spi")
57 struct xfrm6_tunnel_spi
{
58 struct hlist_node list_byaddr
;
59 struct hlist_node list_byspi
;
63 struct rcu_head rcu_head
;
66 static DEFINE_SPINLOCK(xfrm6_tunnel_spi_lock
);
68 static struct kmem_cache
*xfrm6_tunnel_spi_kmem __read_mostly
;
70 static inline unsigned xfrm6_tunnel_spi_hash_byaddr(xfrm_address_t
*addr
)
74 h
= (__force u32
)(addr
->a6
[0] ^ addr
->a6
[1] ^ addr
->a6
[2] ^ addr
->a6
[3]);
77 h
&= XFRM6_TUNNEL_SPI_BYADDR_HSIZE
- 1;
82 static inline unsigned xfrm6_tunnel_spi_hash_byspi(u32 spi
)
84 return spi
% XFRM6_TUNNEL_SPI_BYSPI_HSIZE
;
87 static struct xfrm6_tunnel_spi
*__xfrm6_tunnel_spi_lookup(struct net
*net
, xfrm_address_t
*saddr
)
89 struct xfrm6_tunnel_net
*xfrm6_tn
= xfrm6_tunnel_pernet(net
);
90 struct xfrm6_tunnel_spi
*x6spi
;
91 struct hlist_node
*pos
;
93 hlist_for_each_entry_rcu(x6spi
, pos
,
94 &xfrm6_tn
->spi_byaddr
[xfrm6_tunnel_spi_hash_byaddr(saddr
)],
96 if (memcmp(&x6spi
->addr
, saddr
, sizeof(x6spi
->addr
)) == 0)
103 __be32
xfrm6_tunnel_spi_lookup(struct net
*net
, xfrm_address_t
*saddr
)
105 struct xfrm6_tunnel_spi
*x6spi
;
109 x6spi
= __xfrm6_tunnel_spi_lookup(net
, saddr
);
110 spi
= x6spi
? x6spi
->spi
: 0;
111 rcu_read_unlock_bh();
115 EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup
);
117 static int __xfrm6_tunnel_spi_check(struct net
*net
, u32 spi
)
119 struct xfrm6_tunnel_net
*xfrm6_tn
= xfrm6_tunnel_pernet(net
);
120 struct xfrm6_tunnel_spi
*x6spi
;
121 int index
= xfrm6_tunnel_spi_hash_byspi(spi
);
122 struct hlist_node
*pos
;
124 hlist_for_each_entry(x6spi
, pos
,
125 &xfrm6_tn
->spi_byspi
[index
],
127 if (x6spi
->spi
== spi
)
133 static u32
__xfrm6_tunnel_alloc_spi(struct net
*net
, xfrm_address_t
*saddr
)
135 struct xfrm6_tunnel_net
*xfrm6_tn
= xfrm6_tunnel_pernet(net
);
137 struct xfrm6_tunnel_spi
*x6spi
;
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
;
146 for (spi
= xfrm6_tn
->spi
; spi
<= XFRM6_TUNNEL_SPI_MAX
; spi
++) {
147 index
= __xfrm6_tunnel_spi_check(net
, spi
);
151 for (spi
= XFRM6_TUNNEL_SPI_MIN
; spi
< xfrm6_tn
->spi
; spi
++) {
152 index
= __xfrm6_tunnel_spi_check(net
, spi
);
160 x6spi
= kmem_cache_alloc(xfrm6_tunnel_spi_kmem
, GFP_ATOMIC
);
164 memcpy(&x6spi
->addr
, saddr
, sizeof(x6spi
->addr
));
166 atomic_set(&x6spi
->refcnt
, 1);
168 hlist_add_head_rcu(&x6spi
->list_byspi
, &xfrm6_tn
->spi_byspi
[index
]);
170 index
= xfrm6_tunnel_spi_hash_byaddr(saddr
);
171 hlist_add_head_rcu(&x6spi
->list_byaddr
, &xfrm6_tn
->spi_byaddr
[index
]);
176 __be32
xfrm6_tunnel_alloc_spi(struct net
*net
, xfrm_address_t
*saddr
)
178 struct xfrm6_tunnel_spi
*x6spi
;
181 spin_lock_bh(&xfrm6_tunnel_spi_lock
);
182 x6spi
= __xfrm6_tunnel_spi_lookup(net
, saddr
);
184 atomic_inc(&x6spi
->refcnt
);
187 spi
= __xfrm6_tunnel_alloc_spi(net
, saddr
);
188 spin_unlock_bh(&xfrm6_tunnel_spi_lock
);
193 EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi
);
195 static void x6spi_destroy_rcu(struct rcu_head
*head
)
197 kmem_cache_free(xfrm6_tunnel_spi_kmem
,
198 container_of(head
, struct xfrm6_tunnel_spi
, rcu_head
));
201 void xfrm6_tunnel_free_spi(struct net
*net
, xfrm_address_t
*saddr
)
203 struct xfrm6_tunnel_net
*xfrm6_tn
= xfrm6_tunnel_pernet(net
);
204 struct xfrm6_tunnel_spi
*x6spi
;
205 struct hlist_node
*pos
, *n
;
207 spin_lock_bh(&xfrm6_tunnel_spi_lock
);
209 hlist_for_each_entry_safe(x6spi
, pos
, n
,
210 &xfrm6_tn
->spi_byaddr
[xfrm6_tunnel_spi_hash_byaddr(saddr
)],
213 if (memcmp(&x6spi
->addr
, saddr
, sizeof(x6spi
->addr
)) == 0) {
214 if (atomic_dec_and_test(&x6spi
->refcnt
)) {
215 hlist_del_rcu(&x6spi
->list_byaddr
);
216 hlist_del_rcu(&x6spi
->list_byspi
);
217 call_rcu(&x6spi
->rcu_head
, x6spi_destroy_rcu
);
222 spin_unlock_bh(&xfrm6_tunnel_spi_lock
);
225 EXPORT_SYMBOL(xfrm6_tunnel_free_spi
);
227 static int xfrm6_tunnel_output(struct xfrm_state
*x
, struct sk_buff
*skb
)
229 skb_push(skb
, -skb_network_offset(skb
));
233 static int xfrm6_tunnel_input(struct xfrm_state
*x
, struct sk_buff
*skb
)
235 return skb_network_header(skb
)[IP6CB(skb
)->nhoff
];
238 static int xfrm6_tunnel_rcv(struct sk_buff
*skb
)
240 struct net
*net
= dev_net(skb
->dev
);
241 struct ipv6hdr
*iph
= ipv6_hdr(skb
);
244 spi
= xfrm6_tunnel_spi_lookup(net
, (xfrm_address_t
*)&iph
->saddr
);
245 return xfrm6_rcv_spi(skb
, IPPROTO_IPV6
, spi
) > 0 ? : 0;
248 static int xfrm6_tunnel_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
249 u8 type
, u8 code
, int offset
, __be32 info
)
251 /* xfrm6_tunnel native err handling */
253 case ICMPV6_DEST_UNREACH
:
256 case ICMPV6_ADM_PROHIBITED
:
257 case ICMPV6_NOT_NEIGHBOUR
:
258 case ICMPV6_ADDR_UNREACH
:
259 case ICMPV6_PORT_UNREACH
:
264 case ICMPV6_PKT_TOOBIG
:
266 case ICMPV6_TIME_EXCEED
:
268 case ICMPV6_EXC_HOPLIMIT
:
270 case ICMPV6_EXC_FRAGTIME
:
275 case ICMPV6_PARAMPROB
:
277 case ICMPV6_HDR_FIELD
: break;
278 case ICMPV6_UNK_NEXTHDR
: break;
279 case ICMPV6_UNK_OPTION
: break;
289 static int xfrm6_tunnel_init_state(struct xfrm_state
*x
)
291 if (x
->props
.mode
!= XFRM_MODE_TUNNEL
)
297 x
->props
.header_len
= sizeof(struct ipv6hdr
);
302 static void xfrm6_tunnel_destroy(struct xfrm_state
*x
)
304 struct net
*net
= xs_net(x
);
306 xfrm6_tunnel_free_spi(net
, (xfrm_address_t
*)&x
->props
.saddr
);
309 static const struct xfrm_type xfrm6_tunnel_type
= {
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
,
319 static struct xfrm6_tunnel xfrm6_tunnel_handler
= {
320 .handler
= xfrm6_tunnel_rcv
,
321 .err_handler
= xfrm6_tunnel_err
,
325 static struct xfrm6_tunnel xfrm46_tunnel_handler
= {
326 .handler
= xfrm6_tunnel_rcv
,
327 .err_handler
= xfrm6_tunnel_err
,
331 static int __net_init
xfrm6_tunnel_net_init(struct net
*net
)
333 struct xfrm6_tunnel_net
*xfrm6_tn
= xfrm6_tunnel_pernet(net
);
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
]);
345 static void __net_exit
xfrm6_tunnel_net_exit(struct net
*net
)
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
),
356 static int __init
xfrm6_tunnel_init(void)
360 xfrm6_tunnel_spi_kmem
= kmem_cache_create("xfrm6_tunnel_spi",
361 sizeof(struct xfrm6_tunnel_spi
),
362 0, SLAB_HWCACHE_ALIGN
,
364 if (!xfrm6_tunnel_spi_kmem
)
366 rv
= register_pernet_subsys(&xfrm6_tunnel_net_ops
);
369 rv
= xfrm_register_type(&xfrm6_tunnel_type
, AF_INET6
);
372 rv
= xfrm6_tunnel_register(&xfrm6_tunnel_handler
, AF_INET6
);
375 rv
= xfrm6_tunnel_register(&xfrm46_tunnel_handler
, AF_INET
);
381 xfrm6_tunnel_deregister(&xfrm6_tunnel_handler
, AF_INET6
);
383 xfrm_unregister_type(&xfrm6_tunnel_type
, AF_INET6
);
385 unregister_pernet_subsys(&xfrm6_tunnel_net_ops
);
387 kmem_cache_destroy(xfrm6_tunnel_spi_kmem
);
391 static void __exit
xfrm6_tunnel_fini(void)
393 xfrm6_tunnel_deregister(&xfrm46_tunnel_handler
, AF_INET
);
394 xfrm6_tunnel_deregister(&xfrm6_tunnel_handler
, AF_INET6
);
395 xfrm_unregister_type(&xfrm6_tunnel_type
, AF_INET6
);
396 unregister_pernet_subsys(&xfrm6_tunnel_net_ops
);
397 kmem_cache_destroy(xfrm6_tunnel_spi_kmem
);
400 module_init(xfrm6_tunnel_init
);
401 module_exit(xfrm6_tunnel_fini
);
402 MODULE_LICENSE("GPL");
403 MODULE_ALIAS_XFRM_TYPE(AF_INET6
, XFRM_PROTO_IPV6
);