blob: fae90ff310875eac20da4de63c56469ce53237eb [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09008 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * 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.
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090013 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/module.h>
25#include <linux/xfrm.h>
26#include <linux/list.h>
27#include <net/ip.h>
28#include <net/xfrm.h>
29#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/ipv6.h>
31#include <linux/icmpv6.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080032#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Linus Torvalds1da177e2005-04-16 15:20:36 -070034/*
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090035 * xfrm_tunnel_spi things are for allocating unique id ("spi")
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 * per xfrm_address_t.
37 */
38struct xfrm6_tunnel_spi {
39 struct hlist_node list_byaddr;
40 struct hlist_node list_byspi;
41 xfrm_address_t addr;
42 u32 spi;
43 atomic_t refcnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044};
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046static DEFINE_RWLOCK(xfrm6_tunnel_spi_lock);
47
48static u32 xfrm6_tunnel_spi;
49
50#define XFRM6_TUNNEL_SPI_MIN 1
51#define XFRM6_TUNNEL_SPI_MAX 0xffffffff
52
Christoph Lametere18b8902006-12-06 20:33:20 -080053static struct kmem_cache *xfrm6_tunnel_spi_kmem __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55#define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
56#define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
57
58static struct hlist_head xfrm6_tunnel_spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
59static struct hlist_head xfrm6_tunnel_spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];
60
Dave Jonesb6f99a22007-03-22 12:27:49 -070061static inline unsigned xfrm6_tunnel_spi_hash_byaddr(xfrm_address_t *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
63 unsigned h;
64
Al Viro8c689a62006-11-08 00:20:21 -080065 h = (__force u32)(addr->a6[0] ^ addr->a6[1] ^ addr->a6[2] ^ addr->a6[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 h ^= h >> 16;
67 h ^= h >> 8;
68 h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 return h;
71}
72
Dave Jonesb6f99a22007-03-22 12:27:49 -070073static inline unsigned xfrm6_tunnel_spi_hash_byspi(u32 spi)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074{
75 return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
76}
77
78
79static int xfrm6_tunnel_spi_init(void)
80{
81 int i;
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 xfrm6_tunnel_spi = 0;
84 xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi",
85 sizeof(struct xfrm6_tunnel_spi),
86 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +090087 NULL);
David S. Millera922ba52006-07-24 13:49:06 -070088 if (!xfrm6_tunnel_spi_kmem)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91 for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
92 INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byaddr[i]);
93 for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
94 INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byspi[i]);
95 return 0;
96}
97
98static void xfrm6_tunnel_spi_fini(void)
99{
100 int i;
101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++) {
103 if (!hlist_empty(&xfrm6_tunnel_spi_byaddr[i]))
David S. Millera922ba52006-07-24 13:49:06 -0700104 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 }
106 for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++) {
107 if (!hlist_empty(&xfrm6_tunnel_spi_byspi[i]))
David S. Millera922ba52006-07-24 13:49:06 -0700108 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 }
110 kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
111 xfrm6_tunnel_spi_kmem = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
113
114static struct xfrm6_tunnel_spi *__xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr)
115{
116 struct xfrm6_tunnel_spi *x6spi;
117 struct hlist_node *pos;
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 hlist_for_each_entry(x6spi, pos,
120 &xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
121 list_byaddr) {
David S. Millera922ba52006-07-24 13:49:06 -0700122 if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 return x6spi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 }
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 return NULL;
127}
128
Al Viro8c689a62006-11-08 00:20:21 -0800129__be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
131 struct xfrm6_tunnel_spi *x6spi;
132 u32 spi;
133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 read_lock_bh(&xfrm6_tunnel_spi_lock);
135 x6spi = __xfrm6_tunnel_spi_lookup(saddr);
136 spi = x6spi ? x6spi->spi : 0;
137 read_unlock_bh(&xfrm6_tunnel_spi_lock);
Al Viro5b122542006-11-01 15:28:58 -0800138 return htonl(spi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139}
140
141EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
142
143static u32 __xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
144{
145 u32 spi;
146 struct xfrm6_tunnel_spi *x6spi;
147 struct hlist_node *pos;
148 unsigned index;
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 if (xfrm6_tunnel_spi < XFRM6_TUNNEL_SPI_MIN ||
151 xfrm6_tunnel_spi >= XFRM6_TUNNEL_SPI_MAX)
152 xfrm6_tunnel_spi = XFRM6_TUNNEL_SPI_MIN;
153 else
154 xfrm6_tunnel_spi++;
155
156 for (spi = xfrm6_tunnel_spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
157 index = xfrm6_tunnel_spi_hash_byspi(spi);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900158 hlist_for_each_entry(x6spi, pos,
159 &xfrm6_tunnel_spi_byspi[index],
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 list_byspi) {
161 if (x6spi->spi == spi)
162 goto try_next_1;
163 }
164 xfrm6_tunnel_spi = spi;
165 goto alloc_spi;
166try_next_1:;
167 }
168 for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tunnel_spi; spi++) {
169 index = xfrm6_tunnel_spi_hash_byspi(spi);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900170 hlist_for_each_entry(x6spi, pos,
171 &xfrm6_tunnel_spi_byspi[index],
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 list_byspi) {
173 if (x6spi->spi == spi)
174 goto try_next_2;
175 }
176 xfrm6_tunnel_spi = spi;
177 goto alloc_spi;
178try_next_2:;
179 }
180 spi = 0;
181 goto out;
182alloc_spi:
Christoph Lameter54e6ecb2006-12-06 20:33:16 -0800183 x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, GFP_ATOMIC);
David S. Millera922ba52006-07-24 13:49:06 -0700184 if (!x6spi)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 goto out;
David S. Millera922ba52006-07-24 13:49:06 -0700186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
188 x6spi->spi = spi;
189 atomic_set(&x6spi->refcnt, 1);
190
191 hlist_add_head(&x6spi->list_byspi, &xfrm6_tunnel_spi_byspi[index]);
192
193 index = xfrm6_tunnel_spi_hash_byaddr(saddr);
194 hlist_add_head(&x6spi->list_byaddr, &xfrm6_tunnel_spi_byaddr[index]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 return spi;
197}
198
Al Viro8c689a62006-11-08 00:20:21 -0800199__be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200{
201 struct xfrm6_tunnel_spi *x6spi;
202 u32 spi;
203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 write_lock_bh(&xfrm6_tunnel_spi_lock);
205 x6spi = __xfrm6_tunnel_spi_lookup(saddr);
206 if (x6spi) {
207 atomic_inc(&x6spi->refcnt);
208 spi = x6spi->spi;
209 } else
210 spi = __xfrm6_tunnel_alloc_spi(saddr);
211 write_unlock_bh(&xfrm6_tunnel_spi_lock);
212
Al Viro5b122542006-11-01 15:28:58 -0800213 return htonl(spi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214}
215
216EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);
217
218void xfrm6_tunnel_free_spi(xfrm_address_t *saddr)
219{
220 struct xfrm6_tunnel_spi *x6spi;
221 struct hlist_node *pos, *n;
222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 write_lock_bh(&xfrm6_tunnel_spi_lock);
224
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900225 hlist_for_each_entry_safe(x6spi, pos, n,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 &xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
227 list_byaddr)
228 {
229 if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 if (atomic_dec_and_test(&x6spi->refcnt)) {
231 hlist_del(&x6spi->list_byaddr);
232 hlist_del(&x6spi->list_byspi);
233 kmem_cache_free(xfrm6_tunnel_spi_kmem, x6spi);
234 break;
235 }
236 }
237 }
238 write_unlock_bh(&xfrm6_tunnel_spi_lock);
239}
240
241EXPORT_SYMBOL(xfrm6_tunnel_free_spi);
242
243static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
244{
Herbert Xu7b277b12007-10-10 15:44:06 -0700245 skb_push(skb, -skb_network_offset(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 return 0;
247}
248
Herbert Xue6956332006-04-01 00:52:46 -0800249static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250{
Herbert Xu04663d02007-10-17 21:28:06 -0700251 return skb_network_header(skb)[IP6CB(skb)->nhoff];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252}
253
Herbert Xud2acc342006-03-28 01:12:13 -0800254static int xfrm6_tunnel_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700256 struct ipv6hdr *iph = ipv6_hdr(skb);
Al Viroa252cc22006-09-27 18:48:18 -0700257 __be32 spi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&iph->saddr);
Herbert Xu33b5ecb2007-10-17 21:29:25 -0700260 return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi) > 0 ? : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261}
262
Herbert Xud2acc342006-03-28 01:12:13 -0800263static int xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Al Viro04ce6902006-11-08 00:21:01 -0800264 int type, int code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 /* xfrm6_tunnel native err handling */
267 switch (type) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900268 case ICMPV6_DEST_UNREACH:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 switch (code) {
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900270 case ICMPV6_NOROUTE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 case ICMPV6_ADM_PROHIBITED:
272 case ICMPV6_NOT_NEIGHBOUR:
273 case ICMPV6_ADDR_UNREACH:
274 case ICMPV6_PORT_UNREACH:
275 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 break;
277 }
278 break;
279 case ICMPV6_PKT_TOOBIG:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 break;
281 case ICMPV6_TIME_EXCEED:
282 switch (code) {
283 case ICMPV6_EXC_HOPLIMIT:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 break;
285 case ICMPV6_EXC_FRAGTIME:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900286 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 break;
288 }
289 break;
290 case ICMPV6_PARAMPROB:
291 switch (code) {
292 case ICMPV6_HDR_FIELD: break;
293 case ICMPV6_UNK_NEXTHDR: break;
294 case ICMPV6_UNK_OPTION: break;
295 }
296 break;
297 default:
298 break;
299 }
Herbert Xud2acc342006-03-28 01:12:13 -0800300
301 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302}
303
Herbert Xu72cb6962005-06-20 13:18:08 -0700304static int xfrm6_tunnel_init_state(struct xfrm_state *x)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305{
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -0700306 if (x->props.mode != XFRM_MODE_TUNNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 return -EINVAL;
308
309 if (x->encap)
310 return -EINVAL;
311
312 x->props.header_len = sizeof(struct ipv6hdr);
313
314 return 0;
315}
316
317static void xfrm6_tunnel_destroy(struct xfrm_state *x)
318{
319 xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
320}
321
322static struct xfrm_type xfrm6_tunnel_type = {
323 .description = "IP6IP6",
324 .owner = THIS_MODULE,
325 .proto = IPPROTO_IPV6,
326 .init_state = xfrm6_tunnel_init_state,
327 .destructor = xfrm6_tunnel_destroy,
328 .input = xfrm6_tunnel_input,
329 .output = xfrm6_tunnel_output,
330};
331
Herbert Xud2acc342006-03-28 01:12:13 -0800332static struct xfrm6_tunnel xfrm6_tunnel_handler = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 .handler = xfrm6_tunnel_rcv,
Herbert Xud2acc342006-03-28 01:12:13 -0800334 .err_handler = xfrm6_tunnel_err,
335 .priority = 2,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336};
337
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800338static struct xfrm6_tunnel xfrm46_tunnel_handler = {
339 .handler = xfrm6_tunnel_rcv,
340 .err_handler = xfrm6_tunnel_err,
341 .priority = 2,
342};
343
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344static int __init xfrm6_tunnel_init(void)
345{
David S. Millera922ba52006-07-24 13:49:06 -0700346 if (xfrm_register_type(&xfrm6_tunnel_type, AF_INET6) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 return -EAGAIN;
David S. Millera922ba52006-07-24 13:49:06 -0700348
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800349 if (xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6)) {
350 xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
351 return -EAGAIN;
352 }
353 if (xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET)) {
354 xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
356 return -EAGAIN;
357 }
358 if (xfrm6_tunnel_spi_init() < 0) {
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800359 xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
360 xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
362 return -EAGAIN;
363 }
364 return 0;
365}
366
367static void __exit xfrm6_tunnel_fini(void)
368{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 xfrm6_tunnel_spi_fini();
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800370 xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
371 xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
David S. Millera922ba52006-07-24 13:49:06 -0700372 xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373}
374
375module_init(xfrm6_tunnel_init);
376module_exit(xfrm6_tunnel_fini);
377MODULE_LICENSE("GPL");
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -0700378MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_IPV6);