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/slab.h>
27 #include <linux/rculist.h>
31 #include <linux/ipv6.h>
32 #include <linux/icmpv6.h>
33 #include <linux/mutex.h>
34 #include <net/netns/generic.h>
36 #define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
37 #define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
39 #define XFRM6_TUNNEL_SPI_MIN 1
40 #define XFRM6_TUNNEL_SPI_MAX 0xffffffff
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
];
48 static int xfrm6_tunnel_net_id __read_mostly
;
49 static inline struct xfrm6_tunnel_net
*xfrm6_tunnel_pernet(struct net
*net
)
51 return net_generic(net
, xfrm6_tunnel_net_id
);
55 * xfrm_tunnel_spi things are for allocating unique id ("spi")
58 struct xfrm6_tunnel_spi
{
59 struct hlist_node list_byaddr
;
60 struct hlist_node list_byspi
;
64 struct rcu_head rcu_head
;
67 static DEFINE_SPINLOCK(xfrm6_tunnel_spi_lock
);
69 static struct kmem_cache
*xfrm6_tunnel_spi_kmem __read_mostly
;
71 static inline unsigned xfrm6_tunnel_spi_hash_byaddr(const xfrm_address_t
*addr
)
75 h
= (__force u32
)(addr
->a6
[0] ^ addr
->a6
[1] ^ addr
->a6
[2] ^ addr
->a6
[3]);
78 h
&= XFRM6_TUNNEL_SPI_BYADDR_HSIZE
- 1;
83 static inline unsigned xfrm6_tunnel_spi_hash_byspi(u32 spi
)
85 return spi
% XFRM6_TUNNEL_SPI_BYSPI_HSIZE
;
88 static struct xfrm6_tunnel_spi
*__xfrm6_tunnel_spi_lookup(struct net
*net
, const xfrm_address_t
*saddr
)
90 struct xfrm6_tunnel_net
*xfrm6_tn
= xfrm6_tunnel_pernet(net
);
91 struct xfrm6_tunnel_spi
*x6spi
;
92 struct hlist_node
*pos
;
94 hlist_for_each_entry_rcu(x6spi
, pos
,
95 &xfrm6_tn
->spi_byaddr
[xfrm6_tunnel_spi_hash_byaddr(saddr
)],
97 if (memcmp(&x6spi
->addr
, saddr
, sizeof(x6spi
->addr
)) == 0)
104 __be32
xfrm6_tunnel_spi_lookup(struct net
*net
, const xfrm_address_t
*saddr
)
106 struct xfrm6_tunnel_spi
*x6spi
;
110 x6spi
= __xfrm6_tunnel_spi_lookup(net
, saddr
);
111 spi
= x6spi
? x6spi
->spi
: 0;
112 rcu_read_unlock_bh();
116 EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup
);
118 static int __xfrm6_tunnel_spi_check(struct net
*net
, u32 spi
)
120 struct xfrm6_tunnel_net
*xfrm6_tn
= xfrm6_tunnel_pernet(net
);
121 struct xfrm6_tunnel_spi
*x6spi
;
122 int index
= xfrm6_tunnel_spi_hash_byspi(spi
);
123 struct hlist_node
*pos
;
125 hlist_for_each_entry(x6spi
, pos
,
126 &xfrm6_tn
->spi_byspi
[index
],
128 if (x6spi
->spi
== spi
)
134 static u32
__xfrm6_tunnel_alloc_spi(struct net
*net
, xfrm_address_t
*saddr
)
136 struct xfrm6_tunnel_net
*xfrm6_tn
= xfrm6_tunnel_pernet(net
);
138 struct xfrm6_tunnel_spi
*x6spi
;
141 if (xfrm6_tn
->spi
< XFRM6_TUNNEL_SPI_MIN
||
142 xfrm6_tn
->spi
>= XFRM6_TUNNEL_SPI_MAX
)
143 xfrm6_tn
->spi
= XFRM6_TUNNEL_SPI_MIN
;
147 for (spi
= xfrm6_tn
->spi
; spi
<= XFRM6_TUNNEL_SPI_MAX
; spi
++) {
148 index
= __xfrm6_tunnel_spi_check(net
, spi
);
152 for (spi
= XFRM6_TUNNEL_SPI_MIN
; spi
< xfrm6_tn
->spi
; spi
++) {
153 index
= __xfrm6_tunnel_spi_check(net
, spi
);
161 x6spi
= kmem_cache_alloc(xfrm6_tunnel_spi_kmem
, GFP_ATOMIC
);
165 memcpy(&x6spi
->addr
, saddr
, sizeof(x6spi
->addr
));
167 atomic_set(&x6spi
->refcnt
, 1);
169 hlist_add_head_rcu(&x6spi
->list_byspi
, &xfrm6_tn
->spi_byspi
[index
]);
171 index
= xfrm6_tunnel_spi_hash_byaddr(saddr
);
172 hlist_add_head_rcu(&x6spi
->list_byaddr
, &xfrm6_tn
->spi_byaddr
[index
]);
177 __be32
xfrm6_tunnel_alloc_spi(struct net
*net
, xfrm_address_t
*saddr
)
179 struct xfrm6_tunnel_spi
*x6spi
;
182 spin_lock_bh(&xfrm6_tunnel_spi_lock
);
183 x6spi
= __xfrm6_tunnel_spi_lookup(net
, saddr
);
185 atomic_inc(&x6spi
->refcnt
);
188 spi
= __xfrm6_tunnel_alloc_spi(net
, saddr
);
189 spin_unlock_bh(&xfrm6_tunnel_spi_lock
);
194 EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi
);
196 static void x6spi_destroy_rcu(struct rcu_head
*head
)
198 kmem_cache_free(xfrm6_tunnel_spi_kmem
,
199 container_of(head
, struct xfrm6_tunnel_spi
, rcu_head
));
202 static void xfrm6_tunnel_free_spi(struct net
*net
, xfrm_address_t
*saddr
)
204 struct xfrm6_tunnel_net
*xfrm6_tn
= xfrm6_tunnel_pernet(net
);
205 struct xfrm6_tunnel_spi
*x6spi
;
206 struct hlist_node
*pos
, *n
;
208 spin_lock_bh(&xfrm6_tunnel_spi_lock
);
210 hlist_for_each_entry_safe(x6spi
, pos
, n
,
211 &xfrm6_tn
->spi_byaddr
[xfrm6_tunnel_spi_hash_byaddr(saddr
)],
214 if (memcmp(&x6spi
->addr
, saddr
, sizeof(x6spi
->addr
)) == 0) {
215 if (atomic_dec_and_test(&x6spi
->refcnt
)) {
216 hlist_del_rcu(&x6spi
->list_byaddr
);
217 hlist_del_rcu(&x6spi
->list_byspi
);
218 call_rcu(&x6spi
->rcu_head
, x6spi_destroy_rcu
);
223 spin_unlock_bh(&xfrm6_tunnel_spi_lock
);
226 static int xfrm6_tunnel_output(struct xfrm_state
*x
, struct sk_buff
*skb
)
228 skb_push(skb
, -skb_network_offset(skb
));
232 static int xfrm6_tunnel_input(struct xfrm_state
*x
, struct sk_buff
*skb
)
234 return skb_network_header(skb
)[IP6CB(skb
)->nhoff
];
237 static int xfrm6_tunnel_rcv(struct sk_buff
*skb
)
239 struct net
*net
= dev_net(skb
->dev
);
240 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
243 spi
= xfrm6_tunnel_spi_lookup(net
, (const xfrm_address_t
*)&iph
->saddr
);
244 return xfrm6_rcv_spi(skb
, IPPROTO_IPV6
, spi
);
247 static int xfrm6_tunnel_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
248 u8 type
, u8 code
, int offset
, __be32 info
)
250 /* xfrm6_tunnel native err handling */
252 case ICMPV6_DEST_UNREACH
:
255 case ICMPV6_ADM_PROHIBITED
:
256 case ICMPV6_NOT_NEIGHBOUR
:
257 case ICMPV6_ADDR_UNREACH
:
258 case ICMPV6_PORT_UNREACH
:
263 case ICMPV6_PKT_TOOBIG
:
265 case ICMPV6_TIME_EXCEED
:
267 case ICMPV6_EXC_HOPLIMIT
:
269 case ICMPV6_EXC_FRAGTIME
:
274 case ICMPV6_PARAMPROB
:
276 case ICMPV6_HDR_FIELD
: break;
277 case ICMPV6_UNK_NEXTHDR
: break;
278 case ICMPV6_UNK_OPTION
: break;
288 static int xfrm6_tunnel_init_state(struct xfrm_state
*x
)
290 if (x
->props
.mode
!= XFRM_MODE_TUNNEL
)
296 x
->props
.header_len
= sizeof(struct ipv6hdr
);
301 static void xfrm6_tunnel_destroy(struct xfrm_state
*x
)
303 struct net
*net
= xs_net(x
);
305 xfrm6_tunnel_free_spi(net
, (xfrm_address_t
*)&x
->props
.saddr
);
308 static const struct xfrm_type xfrm6_tunnel_type
= {
309 .description
= "IP6IP6",
310 .owner
= THIS_MODULE
,
311 .proto
= IPPROTO_IPV6
,
312 .init_state
= xfrm6_tunnel_init_state
,
313 .destructor
= xfrm6_tunnel_destroy
,
314 .input
= xfrm6_tunnel_input
,
315 .output
= xfrm6_tunnel_output
,
318 static struct xfrm6_tunnel xfrm6_tunnel_handler __read_mostly
= {
319 .handler
= xfrm6_tunnel_rcv
,
320 .err_handler
= xfrm6_tunnel_err
,
324 static struct xfrm6_tunnel xfrm46_tunnel_handler __read_mostly
= {
325 .handler
= xfrm6_tunnel_rcv
,
326 .err_handler
= xfrm6_tunnel_err
,
330 static int __net_init
xfrm6_tunnel_net_init(struct net
*net
)
332 struct xfrm6_tunnel_net
*xfrm6_tn
= xfrm6_tunnel_pernet(net
);
335 for (i
= 0; i
< XFRM6_TUNNEL_SPI_BYADDR_HSIZE
; i
++)
336 INIT_HLIST_HEAD(&xfrm6_tn
->spi_byaddr
[i
]);
337 for (i
= 0; i
< XFRM6_TUNNEL_SPI_BYSPI_HSIZE
; i
++)
338 INIT_HLIST_HEAD(&xfrm6_tn
->spi_byspi
[i
]);
344 static void __net_exit
xfrm6_tunnel_net_exit(struct net
*net
)
348 static struct pernet_operations xfrm6_tunnel_net_ops
= {
349 .init
= xfrm6_tunnel_net_init
,
350 .exit
= xfrm6_tunnel_net_exit
,
351 .id
= &xfrm6_tunnel_net_id
,
352 .size
= sizeof(struct xfrm6_tunnel_net
),
355 static int __init
xfrm6_tunnel_init(void)
359 xfrm6_tunnel_spi_kmem
= kmem_cache_create("xfrm6_tunnel_spi",
360 sizeof(struct xfrm6_tunnel_spi
),
361 0, SLAB_HWCACHE_ALIGN
,
363 if (!xfrm6_tunnel_spi_kmem
)
365 rv
= register_pernet_subsys(&xfrm6_tunnel_net_ops
);
368 rv
= xfrm_register_type(&xfrm6_tunnel_type
, AF_INET6
);
371 rv
= xfrm6_tunnel_register(&xfrm6_tunnel_handler
, AF_INET6
);
374 rv
= xfrm6_tunnel_register(&xfrm46_tunnel_handler
, AF_INET
);
380 xfrm6_tunnel_deregister(&xfrm6_tunnel_handler
, AF_INET6
);
382 xfrm_unregister_type(&xfrm6_tunnel_type
, AF_INET6
);
384 unregister_pernet_subsys(&xfrm6_tunnel_net_ops
);
386 kmem_cache_destroy(xfrm6_tunnel_spi_kmem
);
390 static void __exit
xfrm6_tunnel_fini(void)
392 xfrm6_tunnel_deregister(&xfrm46_tunnel_handler
, AF_INET
);
393 xfrm6_tunnel_deregister(&xfrm6_tunnel_handler
, AF_INET6
);
394 xfrm_unregister_type(&xfrm6_tunnel_type
, AF_INET6
);
395 unregister_pernet_subsys(&xfrm6_tunnel_net_ops
);
396 kmem_cache_destroy(xfrm6_tunnel_spi_kmem
);
399 module_init(xfrm6_tunnel_init
);
400 module_exit(xfrm6_tunnel_fini
);
401 MODULE_LICENSE("GPL");
402 MODULE_ALIAS_XFRM_TYPE(AF_INET6
, XFRM_PROTO_IPV6
);