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.
8 *
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.
13 *
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 */
24 #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>
30 #include <linux/ipv6.h>
31 #include <linux/icmpv6.h>
32 #include <linux/mutex.h>
33
34 /*
35 * xfrm_tunnel_spi things are for allocating unique id ("spi")
36 * per xfrm_address_t.
37 */
38 struct 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;
44 };
45
46 static DEFINE_RWLOCK(xfrm6_tunnel_spi_lock);
47
48 static u32 xfrm6_tunnel_spi;
49
50 #define XFRM6_TUNNEL_SPI_MIN 1
51 #define XFRM6_TUNNEL_SPI_MAX 0xffffffff
52
53 static struct kmem_cache *xfrm6_tunnel_spi_kmem __read_mostly;
54
55 #define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
56 #define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
57
58 static struct hlist_head xfrm6_tunnel_spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
59 static struct hlist_head xfrm6_tunnel_spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];
60
61 static inline unsigned xfrm6_tunnel_spi_hash_byaddr(xfrm_address_t *addr)
62 {
63 unsigned h;
64
65 h = (__force u32)(addr->a6[0] ^ addr->a6[1] ^ addr->a6[2] ^ addr->a6[3]);
66 h ^= h >> 16;
67 h ^= h >> 8;
68 h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;
69
70 return h;
71 }
72
73 static inline unsigned xfrm6_tunnel_spi_hash_byspi(u32 spi)
74 {
75 return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
76 }
77
78
79 static int xfrm6_tunnel_spi_init(void)
80 {
81 int i;
82
83 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,
87 NULL);
88 if (!xfrm6_tunnel_spi_kmem)
89 return -ENOMEM;
90
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
98 static void xfrm6_tunnel_spi_fini(void)
99 {
100 int i;
101
102 for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++) {
103 if (!hlist_empty(&xfrm6_tunnel_spi_byaddr[i]))
104 return;
105 }
106 for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++) {
107 if (!hlist_empty(&xfrm6_tunnel_spi_byspi[i]))
108 return;
109 }
110 kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
111 xfrm6_tunnel_spi_kmem = NULL;
112 }
113
114 static 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
119 hlist_for_each_entry(x6spi, pos,
120 &xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
121 list_byaddr) {
122 if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0)
123 return x6spi;
124 }
125
126 return NULL;
127 }
128
129 __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr)
130 {
131 struct xfrm6_tunnel_spi *x6spi;
132 u32 spi;
133
134 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);
138 return htonl(spi);
139 }
140
141 EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
142
143 static 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
150 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);
158 hlist_for_each_entry(x6spi, pos,
159 &xfrm6_tunnel_spi_byspi[index],
160 list_byspi) {
161 if (x6spi->spi == spi)
162 goto try_next_1;
163 }
164 xfrm6_tunnel_spi = spi;
165 goto alloc_spi;
166 try_next_1:;
167 }
168 for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tunnel_spi; spi++) {
169 index = xfrm6_tunnel_spi_hash_byspi(spi);
170 hlist_for_each_entry(x6spi, pos,
171 &xfrm6_tunnel_spi_byspi[index],
172 list_byspi) {
173 if (x6spi->spi == spi)
174 goto try_next_2;
175 }
176 xfrm6_tunnel_spi = spi;
177 goto alloc_spi;
178 try_next_2:;
179 }
180 spi = 0;
181 goto out;
182 alloc_spi:
183 x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, GFP_ATOMIC);
184 if (!x6spi)
185 goto out;
186
187 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]);
195 out:
196 return spi;
197 }
198
199 __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr)
200 {
201 struct xfrm6_tunnel_spi *x6spi;
202 u32 spi;
203
204 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
213 return htonl(spi);
214 }
215
216 EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);
217
218 void xfrm6_tunnel_free_spi(xfrm_address_t *saddr)
219 {
220 struct xfrm6_tunnel_spi *x6spi;
221 struct hlist_node *pos, *n;
222
223 write_lock_bh(&xfrm6_tunnel_spi_lock);
224
225 hlist_for_each_entry_safe(x6spi, pos, n,
226 &xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
227 list_byaddr)
228 {
229 if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0) {
230 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
241 EXPORT_SYMBOL(xfrm6_tunnel_free_spi);
242
243 static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
244 {
245 skb_push(skb, -skb_network_offset(skb));
246 return 0;
247 }
248
249 static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
250 {
251 return skb_network_header(skb)[IP6CB(skb)->nhoff];
252 }
253
254 static int xfrm6_tunnel_rcv(struct sk_buff *skb)
255 {
256 struct ipv6hdr *iph = ipv6_hdr(skb);
257 __be32 spi;
258
259 spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&iph->saddr);
260 return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi) > 0 ? : 0;
261 }
262
263 static int xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
264 int type, int code, int offset, __be32 info)
265 {
266 /* xfrm6_tunnel native err handling */
267 switch (type) {
268 case ICMPV6_DEST_UNREACH:
269 switch (code) {
270 case ICMPV6_NOROUTE:
271 case ICMPV6_ADM_PROHIBITED:
272 case ICMPV6_NOT_NEIGHBOUR:
273 case ICMPV6_ADDR_UNREACH:
274 case ICMPV6_PORT_UNREACH:
275 default:
276 break;
277 }
278 break;
279 case ICMPV6_PKT_TOOBIG:
280 break;
281 case ICMPV6_TIME_EXCEED:
282 switch (code) {
283 case ICMPV6_EXC_HOPLIMIT:
284 break;
285 case ICMPV6_EXC_FRAGTIME:
286 default:
287 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 }
300
301 return 0;
302 }
303
304 static int xfrm6_tunnel_init_state(struct xfrm_state *x)
305 {
306 if (x->props.mode != XFRM_MODE_TUNNEL)
307 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
317 static void xfrm6_tunnel_destroy(struct xfrm_state *x)
318 {
319 xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
320 }
321
322 static const 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
332 static struct xfrm6_tunnel xfrm6_tunnel_handler = {
333 .handler = xfrm6_tunnel_rcv,
334 .err_handler = xfrm6_tunnel_err,
335 .priority = 2,
336 };
337
338 static struct xfrm6_tunnel xfrm46_tunnel_handler = {
339 .handler = xfrm6_tunnel_rcv,
340 .err_handler = xfrm6_tunnel_err,
341 .priority = 2,
342 };
343
344 static int __init xfrm6_tunnel_init(void)
345 {
346 if (xfrm_register_type(&xfrm6_tunnel_type, AF_INET6) < 0)
347 return -EAGAIN;
348
349 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);
355 xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
356 return -EAGAIN;
357 }
358 if (xfrm6_tunnel_spi_init() < 0) {
359 xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
360 xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
361 xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
362 return -EAGAIN;
363 }
364 return 0;
365 }
366
367 static void __exit xfrm6_tunnel_fini(void)
368 {
369 xfrm6_tunnel_spi_fini();
370 xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
371 xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
372 xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
373 }
374
375 module_init(xfrm6_tunnel_init);
376 module_exit(xfrm6_tunnel_fini);
377 MODULE_LICENSE("GPL");
378 MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_IPV6);
379
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