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);