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1da177e4 LT |
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/config.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/xfrm.h> | |
27 | #include <linux/list.h> | |
28 | #include <net/ip.h> | |
29 | #include <net/xfrm.h> | |
30 | #include <net/ipv6.h> | |
31 | #include <net/protocol.h> | |
32 | #include <linux/ipv6.h> | |
33 | #include <linux/icmpv6.h> | |
34 | ||
35 | #ifdef CONFIG_IPV6_XFRM6_TUNNEL_DEBUG | |
36 | # define X6TDEBUG 3 | |
37 | #else | |
38 | # define X6TDEBUG 1 | |
39 | #endif | |
40 | ||
41 | #define X6TPRINTK(fmt, args...) printk(fmt, ## args) | |
42 | #define X6TNOPRINTK(fmt, args...) do { ; } while(0) | |
43 | ||
44 | #if X6TDEBUG >= 1 | |
45 | # define X6TPRINTK1 X6TPRINTK | |
46 | #else | |
47 | # define X6TPRINTK1 X6TNOPRINTK | |
48 | #endif | |
49 | ||
50 | #if X6TDEBUG >= 3 | |
51 | # define X6TPRINTK3 X6TPRINTK | |
52 | #else | |
53 | # define X6TPRINTK3 X6TNOPRINTK | |
54 | #endif | |
55 | ||
56 | /* | |
57 | * xfrm_tunnel_spi things are for allocating unique id ("spi") | |
58 | * per xfrm_address_t. | |
59 | */ | |
60 | struct xfrm6_tunnel_spi { | |
61 | struct hlist_node list_byaddr; | |
62 | struct hlist_node list_byspi; | |
63 | xfrm_address_t addr; | |
64 | u32 spi; | |
65 | atomic_t refcnt; | |
66 | #ifdef XFRM6_TUNNEL_SPI_MAGIC | |
67 | u32 magic; | |
68 | #endif | |
69 | }; | |
70 | ||
71 | #ifdef CONFIG_IPV6_XFRM6_TUNNEL_DEBUG | |
72 | # define XFRM6_TUNNEL_SPI_MAGIC 0xdeadbeef | |
73 | #endif | |
74 | ||
75 | static DEFINE_RWLOCK(xfrm6_tunnel_spi_lock); | |
76 | ||
77 | static u32 xfrm6_tunnel_spi; | |
78 | ||
79 | #define XFRM6_TUNNEL_SPI_MIN 1 | |
80 | #define XFRM6_TUNNEL_SPI_MAX 0xffffffff | |
81 | ||
ba89966c | 82 | static kmem_cache_t *xfrm6_tunnel_spi_kmem __read_mostly; |
1da177e4 LT |
83 | |
84 | #define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256 | |
85 | #define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256 | |
86 | ||
87 | static struct hlist_head xfrm6_tunnel_spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE]; | |
88 | static struct hlist_head xfrm6_tunnel_spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE]; | |
89 | ||
90 | #ifdef XFRM6_TUNNEL_SPI_MAGIC | |
91 | static int x6spi_check_magic(const struct xfrm6_tunnel_spi *x6spi, | |
92 | const char *name) | |
93 | { | |
94 | if (unlikely(x6spi->magic != XFRM6_TUNNEL_SPI_MAGIC)) { | |
95 | X6TPRINTK3(KERN_DEBUG "%s(): x6spi object " | |
96 | "at %p has corrupted magic %08x " | |
97 | "(should be %08x)\n", | |
98 | name, x6spi, x6spi->magic, XFRM6_TUNNEL_SPI_MAGIC); | |
99 | return -1; | |
100 | } | |
101 | return 0; | |
102 | } | |
103 | #else | |
104 | static int inline x6spi_check_magic(const struct xfrm6_tunnel_spi *x6spi, | |
105 | const char *name) | |
106 | { | |
107 | return 0; | |
108 | } | |
109 | #endif | |
110 | ||
111 | #define X6SPI_CHECK_MAGIC(x6spi) x6spi_check_magic((x6spi), __FUNCTION__) | |
112 | ||
113 | ||
114 | static unsigned inline xfrm6_tunnel_spi_hash_byaddr(xfrm_address_t *addr) | |
115 | { | |
116 | unsigned h; | |
117 | ||
118 | X6TPRINTK3(KERN_DEBUG "%s(addr=%p)\n", __FUNCTION__, addr); | |
119 | ||
120 | h = addr->a6[0] ^ addr->a6[1] ^ addr->a6[2] ^ addr->a6[3]; | |
121 | h ^= h >> 16; | |
122 | h ^= h >> 8; | |
123 | h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1; | |
124 | ||
125 | X6TPRINTK3(KERN_DEBUG "%s() = %u\n", __FUNCTION__, h); | |
126 | ||
127 | return h; | |
128 | } | |
129 | ||
130 | static unsigned inline xfrm6_tunnel_spi_hash_byspi(u32 spi) | |
131 | { | |
132 | return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE; | |
133 | } | |
134 | ||
135 | ||
136 | static int xfrm6_tunnel_spi_init(void) | |
137 | { | |
138 | int i; | |
139 | ||
140 | X6TPRINTK3(KERN_DEBUG "%s()\n", __FUNCTION__); | |
141 | ||
142 | xfrm6_tunnel_spi = 0; | |
143 | xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi", | |
144 | sizeof(struct xfrm6_tunnel_spi), | |
145 | 0, SLAB_HWCACHE_ALIGN, | |
146 | NULL, NULL); | |
147 | if (!xfrm6_tunnel_spi_kmem) { | |
148 | X6TPRINTK1(KERN_ERR | |
149 | "%s(): failed to allocate xfrm6_tunnel_spi_kmem\n", | |
150 | __FUNCTION__); | |
151 | return -ENOMEM; | |
152 | } | |
153 | ||
154 | for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++) | |
155 | INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byaddr[i]); | |
156 | for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++) | |
157 | INIT_HLIST_HEAD(&xfrm6_tunnel_spi_byspi[i]); | |
158 | return 0; | |
159 | } | |
160 | ||
161 | static void xfrm6_tunnel_spi_fini(void) | |
162 | { | |
163 | int i; | |
164 | ||
165 | X6TPRINTK3(KERN_DEBUG "%s()\n", __FUNCTION__); | |
166 | ||
167 | for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++) { | |
168 | if (!hlist_empty(&xfrm6_tunnel_spi_byaddr[i])) | |
169 | goto err; | |
170 | } | |
171 | for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++) { | |
172 | if (!hlist_empty(&xfrm6_tunnel_spi_byspi[i])) | |
173 | goto err; | |
174 | } | |
175 | kmem_cache_destroy(xfrm6_tunnel_spi_kmem); | |
176 | xfrm6_tunnel_spi_kmem = NULL; | |
177 | return; | |
178 | err: | |
179 | X6TPRINTK1(KERN_ERR "%s(): table is not empty\n", __FUNCTION__); | |
180 | return; | |
181 | } | |
182 | ||
183 | static struct xfrm6_tunnel_spi *__xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr) | |
184 | { | |
185 | struct xfrm6_tunnel_spi *x6spi; | |
186 | struct hlist_node *pos; | |
187 | ||
188 | X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr); | |
189 | ||
190 | hlist_for_each_entry(x6spi, pos, | |
191 | &xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)], | |
192 | list_byaddr) { | |
193 | if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0) { | |
194 | X6SPI_CHECK_MAGIC(x6spi); | |
195 | X6TPRINTK3(KERN_DEBUG "%s() = %p(%u)\n", __FUNCTION__, x6spi, x6spi->spi); | |
196 | return x6spi; | |
197 | } | |
198 | } | |
199 | ||
200 | X6TPRINTK3(KERN_DEBUG "%s() = NULL(0)\n", __FUNCTION__); | |
201 | return NULL; | |
202 | } | |
203 | ||
204 | u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr) | |
205 | { | |
206 | struct xfrm6_tunnel_spi *x6spi; | |
207 | u32 spi; | |
208 | ||
209 | X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr); | |
210 | ||
211 | read_lock_bh(&xfrm6_tunnel_spi_lock); | |
212 | x6spi = __xfrm6_tunnel_spi_lookup(saddr); | |
213 | spi = x6spi ? x6spi->spi : 0; | |
214 | read_unlock_bh(&xfrm6_tunnel_spi_lock); | |
215 | return spi; | |
216 | } | |
217 | ||
218 | EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup); | |
219 | ||
220 | static u32 __xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr) | |
221 | { | |
222 | u32 spi; | |
223 | struct xfrm6_tunnel_spi *x6spi; | |
224 | struct hlist_node *pos; | |
225 | unsigned index; | |
226 | ||
227 | X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr); | |
228 | ||
229 | if (xfrm6_tunnel_spi < XFRM6_TUNNEL_SPI_MIN || | |
230 | xfrm6_tunnel_spi >= XFRM6_TUNNEL_SPI_MAX) | |
231 | xfrm6_tunnel_spi = XFRM6_TUNNEL_SPI_MIN; | |
232 | else | |
233 | xfrm6_tunnel_spi++; | |
234 | ||
235 | for (spi = xfrm6_tunnel_spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) { | |
236 | index = xfrm6_tunnel_spi_hash_byspi(spi); | |
237 | hlist_for_each_entry(x6spi, pos, | |
238 | &xfrm6_tunnel_spi_byspi[index], | |
239 | list_byspi) { | |
240 | if (x6spi->spi == spi) | |
241 | goto try_next_1; | |
242 | } | |
243 | xfrm6_tunnel_spi = spi; | |
244 | goto alloc_spi; | |
245 | try_next_1:; | |
246 | } | |
247 | for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tunnel_spi; spi++) { | |
248 | index = xfrm6_tunnel_spi_hash_byspi(spi); | |
249 | hlist_for_each_entry(x6spi, pos, | |
250 | &xfrm6_tunnel_spi_byspi[index], | |
251 | list_byspi) { | |
252 | if (x6spi->spi == spi) | |
253 | goto try_next_2; | |
254 | } | |
255 | xfrm6_tunnel_spi = spi; | |
256 | goto alloc_spi; | |
257 | try_next_2:; | |
258 | } | |
259 | spi = 0; | |
260 | goto out; | |
261 | alloc_spi: | |
262 | X6TPRINTK3(KERN_DEBUG "%s(): allocate new spi for " | |
263 | "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
264 | __FUNCTION__, | |
265 | NIP6(*(struct in6_addr *)saddr)); | |
266 | x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, SLAB_ATOMIC); | |
267 | if (!x6spi) { | |
268 | X6TPRINTK1(KERN_ERR "%s(): kmem_cache_alloc() failed\n", | |
269 | __FUNCTION__); | |
270 | goto out; | |
271 | } | |
272 | #ifdef XFRM6_TUNNEL_SPI_MAGIC | |
273 | x6spi->magic = XFRM6_TUNNEL_SPI_MAGIC; | |
274 | #endif | |
275 | memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr)); | |
276 | x6spi->spi = spi; | |
277 | atomic_set(&x6spi->refcnt, 1); | |
278 | ||
279 | hlist_add_head(&x6spi->list_byspi, &xfrm6_tunnel_spi_byspi[index]); | |
280 | ||
281 | index = xfrm6_tunnel_spi_hash_byaddr(saddr); | |
282 | hlist_add_head(&x6spi->list_byaddr, &xfrm6_tunnel_spi_byaddr[index]); | |
283 | X6SPI_CHECK_MAGIC(x6spi); | |
284 | out: | |
285 | X6TPRINTK3(KERN_DEBUG "%s() = %u\n", __FUNCTION__, spi); | |
286 | return spi; | |
287 | } | |
288 | ||
289 | u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr) | |
290 | { | |
291 | struct xfrm6_tunnel_spi *x6spi; | |
292 | u32 spi; | |
293 | ||
294 | X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr); | |
295 | ||
296 | write_lock_bh(&xfrm6_tunnel_spi_lock); | |
297 | x6spi = __xfrm6_tunnel_spi_lookup(saddr); | |
298 | if (x6spi) { | |
299 | atomic_inc(&x6spi->refcnt); | |
300 | spi = x6spi->spi; | |
301 | } else | |
302 | spi = __xfrm6_tunnel_alloc_spi(saddr); | |
303 | write_unlock_bh(&xfrm6_tunnel_spi_lock); | |
304 | ||
305 | X6TPRINTK3(KERN_DEBUG "%s() = %u\n", __FUNCTION__, spi); | |
306 | ||
307 | return spi; | |
308 | } | |
309 | ||
310 | EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi); | |
311 | ||
312 | void xfrm6_tunnel_free_spi(xfrm_address_t *saddr) | |
313 | { | |
314 | struct xfrm6_tunnel_spi *x6spi; | |
315 | struct hlist_node *pos, *n; | |
316 | ||
317 | X6TPRINTK3(KERN_DEBUG "%s(saddr=%p)\n", __FUNCTION__, saddr); | |
318 | ||
319 | write_lock_bh(&xfrm6_tunnel_spi_lock); | |
320 | ||
321 | hlist_for_each_entry_safe(x6spi, pos, n, | |
322 | &xfrm6_tunnel_spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)], | |
323 | list_byaddr) | |
324 | { | |
325 | if (memcmp(&x6spi->addr, saddr, sizeof(x6spi->addr)) == 0) { | |
326 | X6TPRINTK3(KERN_DEBUG "%s(): x6spi object " | |
327 | "for %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x " | |
328 | "found at %p\n", | |
329 | __FUNCTION__, | |
330 | NIP6(*(struct in6_addr *)saddr), | |
331 | x6spi); | |
332 | X6SPI_CHECK_MAGIC(x6spi); | |
333 | if (atomic_dec_and_test(&x6spi->refcnt)) { | |
334 | hlist_del(&x6spi->list_byaddr); | |
335 | hlist_del(&x6spi->list_byspi); | |
336 | kmem_cache_free(xfrm6_tunnel_spi_kmem, x6spi); | |
337 | break; | |
338 | } | |
339 | } | |
340 | } | |
341 | write_unlock_bh(&xfrm6_tunnel_spi_lock); | |
342 | } | |
343 | ||
344 | EXPORT_SYMBOL(xfrm6_tunnel_free_spi); | |
345 | ||
346 | static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb) | |
347 | { | |
348 | struct ipv6hdr *top_iph; | |
349 | ||
350 | top_iph = (struct ipv6hdr *)skb->data; | |
351 | top_iph->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
356 | static int xfrm6_tunnel_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb) | |
357 | { | |
358 | return 0; | |
359 | } | |
360 | ||
361 | static struct xfrm6_tunnel *xfrm6_tunnel_handler; | |
362 | static DECLARE_MUTEX(xfrm6_tunnel_sem); | |
363 | ||
364 | int xfrm6_tunnel_register(struct xfrm6_tunnel *handler) | |
365 | { | |
366 | int ret; | |
367 | ||
368 | down(&xfrm6_tunnel_sem); | |
369 | ret = 0; | |
370 | if (xfrm6_tunnel_handler != NULL) | |
371 | ret = -EINVAL; | |
372 | if (!ret) | |
373 | xfrm6_tunnel_handler = handler; | |
374 | up(&xfrm6_tunnel_sem); | |
375 | ||
376 | return ret; | |
377 | } | |
378 | ||
379 | EXPORT_SYMBOL(xfrm6_tunnel_register); | |
380 | ||
381 | int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler) | |
382 | { | |
383 | int ret; | |
384 | ||
385 | down(&xfrm6_tunnel_sem); | |
386 | ret = 0; | |
387 | if (xfrm6_tunnel_handler != handler) | |
388 | ret = -EINVAL; | |
389 | if (!ret) | |
390 | xfrm6_tunnel_handler = NULL; | |
391 | up(&xfrm6_tunnel_sem); | |
392 | ||
393 | synchronize_net(); | |
394 | ||
395 | return ret; | |
396 | } | |
397 | ||
398 | EXPORT_SYMBOL(xfrm6_tunnel_deregister); | |
399 | ||
400 | static int xfrm6_tunnel_rcv(struct sk_buff **pskb, unsigned int *nhoffp) | |
401 | { | |
402 | struct sk_buff *skb = *pskb; | |
403 | struct xfrm6_tunnel *handler = xfrm6_tunnel_handler; | |
404 | struct ipv6hdr *iph = skb->nh.ipv6h; | |
405 | u32 spi; | |
406 | ||
407 | /* device-like_ip6ip6_handler() */ | |
408 | if (handler && handler->handler(pskb, nhoffp) == 0) | |
409 | return 0; | |
410 | ||
411 | spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&iph->saddr); | |
412 | return xfrm6_rcv_spi(pskb, nhoffp, spi); | |
413 | } | |
414 | ||
415 | static void xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
416 | int type, int code, int offset, __u32 info) | |
417 | { | |
418 | struct xfrm6_tunnel *handler = xfrm6_tunnel_handler; | |
419 | ||
420 | /* call here first for device-like ip6ip6 err handling */ | |
421 | if (handler) { | |
422 | handler->err_handler(skb, opt, type, code, offset, info); | |
423 | return; | |
424 | } | |
425 | ||
426 | /* xfrm6_tunnel native err handling */ | |
427 | switch (type) { | |
428 | case ICMPV6_DEST_UNREACH: | |
429 | switch (code) { | |
430 | case ICMPV6_NOROUTE: | |
431 | case ICMPV6_ADM_PROHIBITED: | |
432 | case ICMPV6_NOT_NEIGHBOUR: | |
433 | case ICMPV6_ADDR_UNREACH: | |
434 | case ICMPV6_PORT_UNREACH: | |
435 | default: | |
436 | X6TPRINTK3(KERN_DEBUG | |
437 | "xfrm6_tunnel: Destination Unreach.\n"); | |
438 | break; | |
439 | } | |
440 | break; | |
441 | case ICMPV6_PKT_TOOBIG: | |
442 | X6TPRINTK3(KERN_DEBUG | |
443 | "xfrm6_tunnel: Packet Too Big.\n"); | |
444 | break; | |
445 | case ICMPV6_TIME_EXCEED: | |
446 | switch (code) { | |
447 | case ICMPV6_EXC_HOPLIMIT: | |
448 | X6TPRINTK3(KERN_DEBUG | |
449 | "xfrm6_tunnel: Too small Hoplimit.\n"); | |
450 | break; | |
451 | case ICMPV6_EXC_FRAGTIME: | |
452 | default: | |
453 | break; | |
454 | } | |
455 | break; | |
456 | case ICMPV6_PARAMPROB: | |
457 | switch (code) { | |
458 | case ICMPV6_HDR_FIELD: break; | |
459 | case ICMPV6_UNK_NEXTHDR: break; | |
460 | case ICMPV6_UNK_OPTION: break; | |
461 | } | |
462 | break; | |
463 | default: | |
464 | break; | |
465 | } | |
466 | return; | |
467 | } | |
468 | ||
72cb6962 | 469 | static int xfrm6_tunnel_init_state(struct xfrm_state *x) |
1da177e4 LT |
470 | { |
471 | if (!x->props.mode) | |
472 | return -EINVAL; | |
473 | ||
474 | if (x->encap) | |
475 | return -EINVAL; | |
476 | ||
477 | x->props.header_len = sizeof(struct ipv6hdr); | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
482 | static void xfrm6_tunnel_destroy(struct xfrm_state *x) | |
483 | { | |
484 | xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr); | |
485 | } | |
486 | ||
487 | static struct xfrm_type xfrm6_tunnel_type = { | |
488 | .description = "IP6IP6", | |
489 | .owner = THIS_MODULE, | |
490 | .proto = IPPROTO_IPV6, | |
491 | .init_state = xfrm6_tunnel_init_state, | |
492 | .destructor = xfrm6_tunnel_destroy, | |
493 | .input = xfrm6_tunnel_input, | |
494 | .output = xfrm6_tunnel_output, | |
495 | }; | |
496 | ||
497 | static struct inet6_protocol xfrm6_tunnel_protocol = { | |
498 | .handler = xfrm6_tunnel_rcv, | |
499 | .err_handler = xfrm6_tunnel_err, | |
500 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
501 | }; | |
502 | ||
503 | static int __init xfrm6_tunnel_init(void) | |
504 | { | |
505 | X6TPRINTK3(KERN_DEBUG "%s()\n", __FUNCTION__); | |
506 | ||
507 | if (xfrm_register_type(&xfrm6_tunnel_type, AF_INET6) < 0) { | |
508 | X6TPRINTK1(KERN_ERR | |
509 | "xfrm6_tunnel init: can't add xfrm type\n"); | |
510 | return -EAGAIN; | |
511 | } | |
512 | if (inet6_add_protocol(&xfrm6_tunnel_protocol, IPPROTO_IPV6) < 0) { | |
513 | X6TPRINTK1(KERN_ERR | |
514 | "xfrm6_tunnel init(): can't add protocol\n"); | |
515 | xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6); | |
516 | return -EAGAIN; | |
517 | } | |
518 | if (xfrm6_tunnel_spi_init() < 0) { | |
519 | X6TPRINTK1(KERN_ERR | |
520 | "xfrm6_tunnel init: failed to initialize spi\n"); | |
521 | inet6_del_protocol(&xfrm6_tunnel_protocol, IPPROTO_IPV6); | |
522 | xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6); | |
523 | return -EAGAIN; | |
524 | } | |
525 | return 0; | |
526 | } | |
527 | ||
528 | static void __exit xfrm6_tunnel_fini(void) | |
529 | { | |
530 | X6TPRINTK3(KERN_DEBUG "%s()\n", __FUNCTION__); | |
531 | ||
532 | xfrm6_tunnel_spi_fini(); | |
533 | if (inet6_del_protocol(&xfrm6_tunnel_protocol, IPPROTO_IPV6) < 0) | |
534 | X6TPRINTK1(KERN_ERR | |
535 | "xfrm6_tunnel close: can't remove protocol\n"); | |
536 | if (xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6) < 0) | |
537 | X6TPRINTK1(KERN_ERR | |
538 | "xfrm6_tunnel close: can't remove xfrm type\n"); | |
539 | } | |
540 | ||
541 | module_init(xfrm6_tunnel_init); | |
542 | module_exit(xfrm6_tunnel_fini); | |
543 | MODULE_LICENSE("GPL"); |