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1da177e4 LT |
1 | /* |
2 | * Copyright (C)2002 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 | |
19 | * | |
20 | * Mitsuru KANDA @USAGI : IPv6 Support | |
21 | * Kazunori MIYAZAWA @USAGI : | |
22 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
23 | * | |
24 | * This file is derived from net/ipv4/ah.c. | |
25 | */ | |
26 | ||
1da177e4 LT |
27 | #include <linux/module.h> |
28 | #include <net/ip.h> | |
29 | #include <net/ah.h> | |
30 | #include <linux/crypto.h> | |
31 | #include <linux/pfkeyv2.h> | |
32 | #include <linux/string.h> | |
33 | #include <net/icmp.h> | |
34 | #include <net/ipv6.h> | |
14c85021 | 35 | #include <net/protocol.h> |
1da177e4 LT |
36 | #include <net/xfrm.h> |
37 | #include <asm/scatterlist.h> | |
38 | ||
39 | static int zero_out_mutable_opts(struct ipv6_opt_hdr *opthdr) | |
40 | { | |
41 | u8 *opt = (u8 *)opthdr; | |
42 | int len = ipv6_optlen(opthdr); | |
43 | int off = 0; | |
44 | int optlen = 0; | |
45 | ||
46 | off += 2; | |
47 | len -= 2; | |
48 | ||
49 | while (len > 0) { | |
50 | ||
51 | switch (opt[off]) { | |
52 | ||
53 | case IPV6_TLV_PAD0: | |
54 | optlen = 1; | |
55 | break; | |
56 | default: | |
57 | if (len < 2) | |
58 | goto bad; | |
59 | optlen = opt[off+1]+2; | |
60 | if (len < optlen) | |
61 | goto bad; | |
62 | if (opt[off] & 0x20) | |
63 | memset(&opt[off+2], 0, opt[off+1]); | |
64 | break; | |
65 | } | |
66 | ||
67 | off += optlen; | |
68 | len -= optlen; | |
69 | } | |
70 | if (len == 0) | |
71 | return 1; | |
72 | ||
73 | bad: | |
74 | return 0; | |
75 | } | |
76 | ||
27637df9 MN |
77 | #ifdef CONFIG_IPV6_MIP6 |
78 | /** | |
79 | * ipv6_rearrange_destopt - rearrange IPv6 destination options header | |
80 | * @iph: IPv6 header | |
81 | * @destopt: destionation options header | |
82 | */ | |
83 | static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) | |
84 | { | |
85 | u8 *opt = (u8 *)destopt; | |
86 | int len = ipv6_optlen(destopt); | |
87 | int off = 0; | |
88 | int optlen = 0; | |
89 | ||
90 | off += 2; | |
91 | len -= 2; | |
92 | ||
93 | while (len > 0) { | |
94 | ||
95 | switch (opt[off]) { | |
96 | ||
97 | case IPV6_TLV_PAD0: | |
98 | optlen = 1; | |
99 | break; | |
100 | default: | |
101 | if (len < 2) | |
102 | goto bad; | |
103 | optlen = opt[off+1]+2; | |
104 | if (len < optlen) | |
105 | goto bad; | |
106 | ||
107 | /* Rearrange the source address in @iph and the | |
108 | * addresses in home address option for final source. | |
109 | * See 11.3.2 of RFC 3775 for details. | |
110 | */ | |
111 | if (opt[off] == IPV6_TLV_HAO) { | |
112 | struct in6_addr final_addr; | |
113 | struct ipv6_destopt_hao *hao; | |
114 | ||
115 | hao = (struct ipv6_destopt_hao *)&opt[off]; | |
116 | if (hao->length != sizeof(hao->addr)) { | |
117 | if (net_ratelimit()) | |
118 | printk(KERN_WARNING "destopt hao: invalid header length: %u\n", hao->length); | |
119 | goto bad; | |
120 | } | |
121 | ipv6_addr_copy(&final_addr, &hao->addr); | |
122 | ipv6_addr_copy(&hao->addr, &iph->saddr); | |
123 | ipv6_addr_copy(&iph->saddr, &final_addr); | |
124 | } | |
125 | break; | |
126 | } | |
127 | ||
128 | off += optlen; | |
129 | len -= optlen; | |
130 | } | |
131 | if (len == 0) | |
132 | return; | |
133 | ||
134 | bad: | |
135 | return; | |
136 | } | |
137 | #endif | |
138 | ||
1da177e4 LT |
139 | /** |
140 | * ipv6_rearrange_rthdr - rearrange IPv6 routing header | |
141 | * @iph: IPv6 header | |
142 | * @rthdr: routing header | |
143 | * | |
144 | * Rearrange the destination address in @iph and the addresses in @rthdr | |
145 | * so that they appear in the order they will at the final destination. | |
146 | * See Appendix A2 of RFC 2402 for details. | |
147 | */ | |
148 | static void ipv6_rearrange_rthdr(struct ipv6hdr *iph, struct ipv6_rt_hdr *rthdr) | |
149 | { | |
150 | int segments, segments_left; | |
151 | struct in6_addr *addrs; | |
152 | struct in6_addr final_addr; | |
153 | ||
154 | segments_left = rthdr->segments_left; | |
155 | if (segments_left == 0) | |
156 | return; | |
157 | rthdr->segments_left = 0; | |
158 | ||
159 | /* The value of rthdr->hdrlen has been verified either by the system | |
160 | * call if it is locally generated, or by ipv6_rthdr_rcv() for incoming | |
161 | * packets. So we can assume that it is even and that segments is | |
162 | * greater than or equal to segments_left. | |
163 | * | |
164 | * For the same reason we can assume that this option is of type 0. | |
165 | */ | |
166 | segments = rthdr->hdrlen >> 1; | |
167 | ||
168 | addrs = ((struct rt0_hdr *)rthdr)->addr; | |
169 | ipv6_addr_copy(&final_addr, addrs + segments - 1); | |
170 | ||
171 | addrs += segments - segments_left; | |
172 | memmove(addrs + 1, addrs, (segments_left - 1) * sizeof(*addrs)); | |
173 | ||
174 | ipv6_addr_copy(addrs, &iph->daddr); | |
175 | ipv6_addr_copy(&iph->daddr, &final_addr); | |
176 | } | |
177 | ||
27637df9 MN |
178 | #ifdef CONFIG_IPV6_MIP6 |
179 | static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir) | |
180 | #else | |
1da177e4 | 181 | static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len) |
27637df9 | 182 | #endif |
1da177e4 LT |
183 | { |
184 | union { | |
185 | struct ipv6hdr *iph; | |
186 | struct ipv6_opt_hdr *opth; | |
187 | struct ipv6_rt_hdr *rth; | |
188 | char *raw; | |
189 | } exthdr = { .iph = iph }; | |
190 | char *end = exthdr.raw + len; | |
191 | int nexthdr = iph->nexthdr; | |
192 | ||
193 | exthdr.iph++; | |
194 | ||
195 | while (exthdr.raw < end) { | |
196 | switch (nexthdr) { | |
27637df9 MN |
197 | #ifdef CONFIG_IPV6_MIP6 |
198 | case NEXTHDR_HOP: | |
199 | if (!zero_out_mutable_opts(exthdr.opth)) { | |
200 | LIMIT_NETDEBUG( | |
201 | KERN_WARNING "overrun %sopts\n", | |
202 | nexthdr == NEXTHDR_HOP ? | |
203 | "hop" : "dest"); | |
204 | return -EINVAL; | |
205 | } | |
206 | break; | |
207 | case NEXTHDR_DEST: | |
208 | if (dir == XFRM_POLICY_OUT) | |
209 | ipv6_rearrange_destopt(iph, exthdr.opth); | |
210 | if (!zero_out_mutable_opts(exthdr.opth)) { | |
211 | LIMIT_NETDEBUG( | |
212 | KERN_WARNING "overrun %sopts\n", | |
213 | nexthdr == NEXTHDR_HOP ? | |
214 | "hop" : "dest"); | |
215 | return -EINVAL; | |
216 | } | |
217 | break; | |
218 | #else | |
1da177e4 LT |
219 | case NEXTHDR_HOP: |
220 | case NEXTHDR_DEST: | |
221 | if (!zero_out_mutable_opts(exthdr.opth)) { | |
64ce2073 | 222 | LIMIT_NETDEBUG( |
1da177e4 LT |
223 | KERN_WARNING "overrun %sopts\n", |
224 | nexthdr == NEXTHDR_HOP ? | |
64ce2073 | 225 | "hop" : "dest"); |
1da177e4 LT |
226 | return -EINVAL; |
227 | } | |
228 | break; | |
27637df9 | 229 | #endif |
1da177e4 LT |
230 | |
231 | case NEXTHDR_ROUTING: | |
232 | ipv6_rearrange_rthdr(iph, exthdr.rth); | |
233 | break; | |
234 | ||
235 | default : | |
236 | return 0; | |
237 | } | |
238 | ||
239 | nexthdr = exthdr.opth->nexthdr; | |
240 | exthdr.raw += ipv6_optlen(exthdr.opth); | |
241 | } | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | static int ah6_output(struct xfrm_state *x, struct sk_buff *skb) | |
247 | { | |
248 | int err; | |
249 | int extlen; | |
250 | struct ipv6hdr *top_iph; | |
251 | struct ip_auth_hdr *ah; | |
252 | struct ah_data *ahp; | |
253 | u8 nexthdr; | |
254 | char tmp_base[8]; | |
255 | struct { | |
27637df9 MN |
256 | #ifdef CONFIG_IPV6_MIP6 |
257 | struct in6_addr saddr; | |
258 | #endif | |
1da177e4 LT |
259 | struct in6_addr daddr; |
260 | char hdrs[0]; | |
261 | } *tmp_ext; | |
262 | ||
263 | top_iph = (struct ipv6hdr *)skb->data; | |
264 | top_iph->payload_len = htons(skb->len - sizeof(*top_iph)); | |
265 | ||
266 | nexthdr = *skb->nh.raw; | |
267 | *skb->nh.raw = IPPROTO_AH; | |
268 | ||
269 | /* When there are no extension headers, we only need to save the first | |
270 | * 8 bytes of the base IP header. | |
271 | */ | |
272 | memcpy(tmp_base, top_iph, sizeof(tmp_base)); | |
273 | ||
274 | tmp_ext = NULL; | |
275 | extlen = skb->h.raw - (unsigned char *)(top_iph + 1); | |
276 | if (extlen) { | |
277 | extlen += sizeof(*tmp_ext); | |
278 | tmp_ext = kmalloc(extlen, GFP_ATOMIC); | |
279 | if (!tmp_ext) { | |
280 | err = -ENOMEM; | |
281 | goto error; | |
282 | } | |
27637df9 MN |
283 | #ifdef CONFIG_IPV6_MIP6 |
284 | memcpy(tmp_ext, &top_iph->saddr, extlen); | |
285 | err = ipv6_clear_mutable_options(top_iph, | |
286 | extlen - sizeof(*tmp_ext) + | |
287 | sizeof(*top_iph), | |
288 | XFRM_POLICY_OUT); | |
289 | #else | |
1da177e4 LT |
290 | memcpy(tmp_ext, &top_iph->daddr, extlen); |
291 | err = ipv6_clear_mutable_options(top_iph, | |
292 | extlen - sizeof(*tmp_ext) + | |
293 | sizeof(*top_iph)); | |
27637df9 | 294 | #endif |
1da177e4 LT |
295 | if (err) |
296 | goto error_free_iph; | |
297 | } | |
298 | ||
299 | ah = (struct ip_auth_hdr *)skb->h.raw; | |
300 | ah->nexthdr = nexthdr; | |
301 | ||
302 | top_iph->priority = 0; | |
303 | top_iph->flow_lbl[0] = 0; | |
304 | top_iph->flow_lbl[1] = 0; | |
305 | top_iph->flow_lbl[2] = 0; | |
306 | top_iph->hop_limit = 0; | |
307 | ||
308 | ahp = x->data; | |
309 | ah->hdrlen = (XFRM_ALIGN8(sizeof(struct ipv6_auth_hdr) + | |
310 | ahp->icv_trunc_len) >> 2) - 2; | |
311 | ||
312 | ah->reserved = 0; | |
313 | ah->spi = x->id.spi; | |
314 | ah->seq_no = htonl(++x->replay.oseq); | |
9500e8a8 | 315 | xfrm_aevent_doreplay(x); |
07d4ee58 HX |
316 | err = ah_mac_digest(ahp, skb, ah->auth_data); |
317 | if (err) | |
318 | goto error_free_iph; | |
319 | memcpy(ah->auth_data, ahp->work_icv, ahp->icv_trunc_len); | |
1da177e4 LT |
320 | |
321 | err = 0; | |
322 | ||
323 | memcpy(top_iph, tmp_base, sizeof(tmp_base)); | |
324 | if (tmp_ext) { | |
27637df9 MN |
325 | #ifdef CONFIG_IPV6_MIP6 |
326 | memcpy(&top_iph->saddr, tmp_ext, extlen); | |
327 | #else | |
1da177e4 | 328 | memcpy(&top_iph->daddr, tmp_ext, extlen); |
27637df9 | 329 | #endif |
1da177e4 LT |
330 | error_free_iph: |
331 | kfree(tmp_ext); | |
332 | } | |
333 | ||
334 | error: | |
335 | return err; | |
336 | } | |
337 | ||
e695633e | 338 | static int ah6_input(struct xfrm_state *x, struct sk_buff *skb) |
1da177e4 LT |
339 | { |
340 | /* | |
341 | * Before process AH | |
342 | * [IPv6][Ext1][Ext2][AH][Dest][Payload] | |
343 | * |<-------------->| hdr_len | |
344 | * | |
345 | * To erase AH: | |
346 | * Keeping copy of cleared headers. After AH processing, | |
347 | * Moving the pointer of skb->nh.raw by using skb_pull as long as AH | |
348 | * header length. Then copy back the copy as long as hdr_len | |
349 | * If destination header following AH exists, copy it into after [Ext2]. | |
350 | * | |
351 | * |<>|[IPv6][Ext1][Ext2][Dest][Payload] | |
352 | * There is offset of AH before IPv6 header after the process. | |
353 | */ | |
354 | ||
355 | struct ipv6_auth_hdr *ah; | |
356 | struct ah_data *ahp; | |
357 | unsigned char *tmp_hdr = NULL; | |
358 | u16 hdr_len; | |
359 | u16 ah_hlen; | |
360 | int nexthdr; | |
07d4ee58 | 361 | int err = -EINVAL; |
1da177e4 LT |
362 | |
363 | if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr))) | |
364 | goto out; | |
365 | ||
366 | /* We are going to _remove_ AH header to keep sockets happy, | |
367 | * so... Later this can change. */ | |
368 | if (skb_cloned(skb) && | |
369 | pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) | |
370 | goto out; | |
371 | ||
372 | hdr_len = skb->data - skb->nh.raw; | |
373 | ah = (struct ipv6_auth_hdr*)skb->data; | |
374 | ahp = x->data; | |
375 | nexthdr = ah->nexthdr; | |
376 | ah_hlen = (ah->hdrlen + 2) << 2; | |
377 | ||
378 | if (ah_hlen != XFRM_ALIGN8(sizeof(struct ipv6_auth_hdr) + ahp->icv_full_len) && | |
379 | ah_hlen != XFRM_ALIGN8(sizeof(struct ipv6_auth_hdr) + ahp->icv_trunc_len)) | |
380 | goto out; | |
381 | ||
382 | if (!pskb_may_pull(skb, ah_hlen)) | |
383 | goto out; | |
384 | ||
385 | tmp_hdr = kmalloc(hdr_len, GFP_ATOMIC); | |
386 | if (!tmp_hdr) | |
387 | goto out; | |
388 | memcpy(tmp_hdr, skb->nh.raw, hdr_len); | |
27637df9 MN |
389 | #ifdef CONFIG_IPV6_MIP6 |
390 | if (ipv6_clear_mutable_options(skb->nh.ipv6h, hdr_len, XFRM_POLICY_IN)) | |
391 | goto free_out; | |
392 | #else | |
1da177e4 | 393 | if (ipv6_clear_mutable_options(skb->nh.ipv6h, hdr_len)) |
f8dc01f5 | 394 | goto free_out; |
27637df9 | 395 | #endif |
1da177e4 LT |
396 | skb->nh.ipv6h->priority = 0; |
397 | skb->nh.ipv6h->flow_lbl[0] = 0; | |
398 | skb->nh.ipv6h->flow_lbl[1] = 0; | |
399 | skb->nh.ipv6h->flow_lbl[2] = 0; | |
400 | skb->nh.ipv6h->hop_limit = 0; | |
401 | ||
402 | { | |
403 | u8 auth_data[MAX_AH_AUTH_LEN]; | |
404 | ||
405 | memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len); | |
406 | memset(ah->auth_data, 0, ahp->icv_trunc_len); | |
31a4ab93 | 407 | skb_push(skb, hdr_len); |
07d4ee58 HX |
408 | err = ah_mac_digest(ahp, skb, ah->auth_data); |
409 | if (err) | |
410 | goto free_out; | |
411 | err = -EINVAL; | |
412 | if (memcmp(ahp->work_icv, auth_data, ahp->icv_trunc_len)) { | |
64ce2073 | 413 | LIMIT_NETDEBUG(KERN_WARNING "ipsec ah authentication error\n"); |
1da177e4 LT |
414 | x->stats.integrity_failed++; |
415 | goto free_out; | |
416 | } | |
417 | } | |
418 | ||
31a4ab93 HX |
419 | skb->h.raw = memcpy(skb->nh.raw += ah_hlen, tmp_hdr, hdr_len); |
420 | __skb_pull(skb, ah_hlen + hdr_len); | |
1da177e4 LT |
421 | |
422 | kfree(tmp_hdr); | |
423 | ||
424 | return nexthdr; | |
425 | ||
426 | free_out: | |
427 | kfree(tmp_hdr); | |
428 | out: | |
07d4ee58 | 429 | return err; |
1da177e4 LT |
430 | } |
431 | ||
432 | static void ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
433 | int type, int code, int offset, __u32 info) | |
434 | { | |
435 | struct ipv6hdr *iph = (struct ipv6hdr*)skb->data; | |
436 | struct ip_auth_hdr *ah = (struct ip_auth_hdr*)(skb->data+offset); | |
437 | struct xfrm_state *x; | |
438 | ||
439 | if (type != ICMPV6_DEST_UNREACH && | |
440 | type != ICMPV6_PKT_TOOBIG) | |
441 | return; | |
442 | ||
443 | x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET6); | |
444 | if (!x) | |
445 | return; | |
446 | ||
46b86a2d | 447 | NETDEBUG(KERN_DEBUG "pmtu discovery on SA AH/%08x/" NIP6_FMT "\n", |
64ce2073 | 448 | ntohl(ah->spi), NIP6(iph->daddr)); |
1da177e4 LT |
449 | |
450 | xfrm_state_put(x); | |
451 | } | |
452 | ||
72cb6962 | 453 | static int ah6_init_state(struct xfrm_state *x) |
1da177e4 LT |
454 | { |
455 | struct ah_data *ahp = NULL; | |
456 | struct xfrm_algo_desc *aalg_desc; | |
07d4ee58 | 457 | struct crypto_hash *tfm; |
1da177e4 LT |
458 | |
459 | if (!x->aalg) | |
460 | goto error; | |
461 | ||
462 | /* null auth can use a zero length key */ | |
463 | if (x->aalg->alg_key_len > 512) | |
464 | goto error; | |
465 | ||
466 | if (x->encap) | |
467 | goto error; | |
468 | ||
0c600eda | 469 | ahp = kzalloc(sizeof(*ahp), GFP_KERNEL); |
1da177e4 LT |
470 | if (ahp == NULL) |
471 | return -ENOMEM; | |
472 | ||
1da177e4 LT |
473 | ahp->key = x->aalg->alg_key; |
474 | ahp->key_len = (x->aalg->alg_key_len+7)/8; | |
07d4ee58 HX |
475 | tfm = crypto_alloc_hash(x->aalg->alg_name, 0, CRYPTO_ALG_ASYNC); |
476 | if (IS_ERR(tfm)) | |
477 | goto error; | |
478 | ||
479 | ahp->tfm = tfm; | |
480 | if (crypto_hash_setkey(tfm, ahp->key, ahp->key_len)) | |
1da177e4 | 481 | goto error; |
1da177e4 LT |
482 | |
483 | /* | |
484 | * Lookup the algorithm description maintained by xfrm_algo, | |
485 | * verify crypto transform properties, and store information | |
486 | * we need for AH processing. This lookup cannot fail here | |
07d4ee58 | 487 | * after a successful crypto_alloc_hash(). |
1da177e4 LT |
488 | */ |
489 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); | |
490 | BUG_ON(!aalg_desc); | |
491 | ||
492 | if (aalg_desc->uinfo.auth.icv_fullbits/8 != | |
07d4ee58 | 493 | crypto_hash_digestsize(tfm)) { |
1da177e4 | 494 | printk(KERN_INFO "AH: %s digestsize %u != %hu\n", |
07d4ee58 | 495 | x->aalg->alg_name, crypto_hash_digestsize(tfm), |
1da177e4 LT |
496 | aalg_desc->uinfo.auth.icv_fullbits/8); |
497 | goto error; | |
498 | } | |
499 | ||
500 | ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8; | |
501 | ahp->icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8; | |
502 | ||
503 | BUG_ON(ahp->icv_trunc_len > MAX_AH_AUTH_LEN); | |
504 | ||
505 | ahp->work_icv = kmalloc(ahp->icv_full_len, GFP_KERNEL); | |
506 | if (!ahp->work_icv) | |
507 | goto error; | |
508 | ||
509 | x->props.header_len = XFRM_ALIGN8(sizeof(struct ipv6_auth_hdr) + ahp->icv_trunc_len); | |
7e49e6de | 510 | if (x->props.mode == XFRM_MODE_TUNNEL) |
1da177e4 LT |
511 | x->props.header_len += sizeof(struct ipv6hdr); |
512 | x->data = ahp; | |
513 | ||
514 | return 0; | |
515 | ||
516 | error: | |
517 | if (ahp) { | |
573dbd95 | 518 | kfree(ahp->work_icv); |
07d4ee58 | 519 | crypto_free_hash(ahp->tfm); |
1da177e4 LT |
520 | kfree(ahp); |
521 | } | |
522 | return -EINVAL; | |
523 | } | |
524 | ||
525 | static void ah6_destroy(struct xfrm_state *x) | |
526 | { | |
527 | struct ah_data *ahp = x->data; | |
528 | ||
529 | if (!ahp) | |
530 | return; | |
531 | ||
573dbd95 JJ |
532 | kfree(ahp->work_icv); |
533 | ahp->work_icv = NULL; | |
07d4ee58 | 534 | crypto_free_hash(ahp->tfm); |
573dbd95 | 535 | ahp->tfm = NULL; |
1da177e4 LT |
536 | kfree(ahp); |
537 | } | |
538 | ||
539 | static struct xfrm_type ah6_type = | |
540 | { | |
541 | .description = "AH6", | |
542 | .owner = THIS_MODULE, | |
543 | .proto = IPPROTO_AH, | |
544 | .init_state = ah6_init_state, | |
545 | .destructor = ah6_destroy, | |
546 | .input = ah6_input, | |
aee5adb4 MN |
547 | .output = ah6_output, |
548 | .hdr_offset = xfrm6_find_1stfragopt, | |
1da177e4 LT |
549 | }; |
550 | ||
551 | static struct inet6_protocol ah6_protocol = { | |
552 | .handler = xfrm6_rcv, | |
553 | .err_handler = ah6_err, | |
554 | .flags = INET6_PROTO_NOPOLICY, | |
555 | }; | |
556 | ||
557 | static int __init ah6_init(void) | |
558 | { | |
559 | if (xfrm_register_type(&ah6_type, AF_INET6) < 0) { | |
560 | printk(KERN_INFO "ipv6 ah init: can't add xfrm type\n"); | |
561 | return -EAGAIN; | |
562 | } | |
563 | ||
564 | if (inet6_add_protocol(&ah6_protocol, IPPROTO_AH) < 0) { | |
565 | printk(KERN_INFO "ipv6 ah init: can't add protocol\n"); | |
566 | xfrm_unregister_type(&ah6_type, AF_INET6); | |
567 | return -EAGAIN; | |
568 | } | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
573 | static void __exit ah6_fini(void) | |
574 | { | |
575 | if (inet6_del_protocol(&ah6_protocol, IPPROTO_AH) < 0) | |
576 | printk(KERN_INFO "ipv6 ah close: can't remove protocol\n"); | |
577 | ||
578 | if (xfrm_unregister_type(&ah6_type, AF_INET6) < 0) | |
579 | printk(KERN_INFO "ipv6 ah close: can't remove xfrm type\n"); | |
580 | ||
581 | } | |
582 | ||
583 | module_init(ah6_init); | |
584 | module_exit(ah6_fini); | |
585 | ||
586 | MODULE_LICENSE("GPL"); |