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Merge branch 'fix/hda' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
[linux/fpc-iii.git] / net / ipv6 / ah6.c
blobc2f300c314be8f37699d220fbb6ab5e62039990a
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
27 #include <crypto/hash.h>
28 #include <linux/module.h>
29 #include <net/ip.h>
30 #include <net/ah.h>
31 #include <linux/crypto.h>
32 #include <linux/pfkeyv2.h>
33 #include <linux/string.h>
34 #include <linux/scatterlist.h>
35 #include <net/icmp.h>
36 #include <net/ipv6.h>
37 #include <net/protocol.h>
38 #include <net/xfrm.h>
39
40 #define IPV6HDR_BASELEN 8
41
42 struct tmp_ext {
43 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
44 struct in6_addr saddr;
45 #endif
46 struct in6_addr daddr;
47 char hdrs[0];
48 };
49
50 struct ah_skb_cb {
51 struct xfrm_skb_cb xfrm;
52 void *tmp;
53 };
54
55 #define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0]))
56
57 static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags,
58 unsigned int size)
59 {
60 unsigned int len;
61
62 len = size + crypto_ahash_digestsize(ahash) +
63 (crypto_ahash_alignmask(ahash) &
64 ~(crypto_tfm_ctx_alignment() - 1));
65
66 len = ALIGN(len, crypto_tfm_ctx_alignment());
67
68 len += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash);
69 len = ALIGN(len, __alignof__(struct scatterlist));
70
71 len += sizeof(struct scatterlist) * nfrags;
72
73 return kmalloc(len, GFP_ATOMIC);
74 }
75
76 static inline struct tmp_ext *ah_tmp_ext(void *base)
77 {
78 return base + IPV6HDR_BASELEN;
79 }
80
81 static inline u8 *ah_tmp_auth(u8 *tmp, unsigned int offset)
82 {
83 return tmp + offset;
84 }
85
86 static inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp,
87 unsigned int offset)
88 {
89 return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1);
90 }
91
92 static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash,
93 u8 *icv)
94 {
95 struct ahash_request *req;
96
97 req = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash),
98 crypto_tfm_ctx_alignment());
99
100 ahash_request_set_tfm(req, ahash);
101
102 return req;
103 }
104
105 static inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash,
106 struct ahash_request *req)
107 {
108 return (void *)ALIGN((unsigned long)(req + 1) +
109 crypto_ahash_reqsize(ahash),
110 __alignof__(struct scatterlist));
111 }
112
113 static int zero_out_mutable_opts(struct ipv6_opt_hdr *opthdr)
114 {
115 u8 *opt = (u8 *)opthdr;
116 int len = ipv6_optlen(opthdr);
117 int off = 0;
118 int optlen = 0;
119
120 off += 2;
121 len -= 2;
122
123 while (len > 0) {
124
125 switch (opt[off]) {
126
127 case IPV6_TLV_PAD0:
128 optlen = 1;
129 break;
130 default:
131 if (len < 2)
132 goto bad;
133 optlen = opt[off+1]+2;
134 if (len < optlen)
135 goto bad;
136 if (opt[off] & 0x20)
137 memset(&opt[off+2], 0, opt[off+1]);
138 break;
139 }
140
141 off += optlen;
142 len -= optlen;
143 }
144 if (len == 0)
145 return 1;
146
147 bad:
148 return 0;
149 }
150
151 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
152 /**
153 * ipv6_rearrange_destopt - rearrange IPv6 destination options header
154 * @iph: IPv6 header
155 * @destopt: destionation options header
156 */
157 static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt)
158 {
159 u8 *opt = (u8 *)destopt;
160 int len = ipv6_optlen(destopt);
161 int off = 0;
162 int optlen = 0;
163
164 off += 2;
165 len -= 2;
166
167 while (len > 0) {
168
169 switch (opt[off]) {
170
171 case IPV6_TLV_PAD0:
172 optlen = 1;
173 break;
174 default:
175 if (len < 2)
176 goto bad;
177 optlen = opt[off+1]+2;
178 if (len < optlen)
179 goto bad;
180
181 /* Rearrange the source address in @iph and the
182 * addresses in home address option for final source.
183 * See 11.3.2 of RFC 3775 for details.
184 */
185 if (opt[off] == IPV6_TLV_HAO) {
186 struct in6_addr final_addr;
187 struct ipv6_destopt_hao *hao;
188
189 hao = (struct ipv6_destopt_hao *)&opt[off];
190 if (hao->length != sizeof(hao->addr)) {
191 if (net_ratelimit())
192 printk(KERN_WARNING "destopt hao: invalid header length: %u\n", hao->length);
193 goto bad;
194 }
195 ipv6_addr_copy(&final_addr, &hao->addr);
196 ipv6_addr_copy(&hao->addr, &iph->saddr);
197 ipv6_addr_copy(&iph->saddr, &final_addr);
198 }
199 break;
200 }
201
202 off += optlen;
203 len -= optlen;
204 }
205 /* Note: ok if len == 0 */
206 bad:
207 return;
208 }
209 #else
210 static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) {}
211 #endif
212
213 /**
214 * ipv6_rearrange_rthdr - rearrange IPv6 routing header
215 * @iph: IPv6 header
216 * @rthdr: routing header
217 *
218 * Rearrange the destination address in @iph and the addresses in @rthdr
219 * so that they appear in the order they will at the final destination.
220 * See Appendix A2 of RFC 2402 for details.
221 */
222 static void ipv6_rearrange_rthdr(struct ipv6hdr *iph, struct ipv6_rt_hdr *rthdr)
223 {
224 int segments, segments_left;
225 struct in6_addr *addrs;
226 struct in6_addr final_addr;
227
228 segments_left = rthdr->segments_left;
229 if (segments_left == 0)
230 return;
231 rthdr->segments_left = 0;
232
233 /* The value of rthdr->hdrlen has been verified either by the system
234 * call if it is locally generated, or by ipv6_rthdr_rcv() for incoming
235 * packets. So we can assume that it is even and that segments is
236 * greater than or equal to segments_left.
237 *
238 * For the same reason we can assume that this option is of type 0.
239 */
240 segments = rthdr->hdrlen >> 1;
241
242 addrs = ((struct rt0_hdr *)rthdr)->addr;
243 ipv6_addr_copy(&final_addr, addrs + segments - 1);
244
245 addrs += segments - segments_left;
246 memmove(addrs + 1, addrs, (segments_left - 1) * sizeof(*addrs));
247
248 ipv6_addr_copy(addrs, &iph->daddr);
249 ipv6_addr_copy(&iph->daddr, &final_addr);
250 }
251
252 static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir)
253 {
254 union {
255 struct ipv6hdr *iph;
256 struct ipv6_opt_hdr *opth;
257 struct ipv6_rt_hdr *rth;
258 char *raw;
259 } exthdr = { .iph = iph };
260 char *end = exthdr.raw + len;
261 int nexthdr = iph->nexthdr;
262
263 exthdr.iph++;
264
265 while (exthdr.raw < end) {
266 switch (nexthdr) {
267 case NEXTHDR_DEST:
268 if (dir == XFRM_POLICY_OUT)
269 ipv6_rearrange_destopt(iph, exthdr.opth);
270 case NEXTHDR_HOP:
271 if (!zero_out_mutable_opts(exthdr.opth)) {
272 LIMIT_NETDEBUG(
273 KERN_WARNING "overrun %sopts\n",
274 nexthdr == NEXTHDR_HOP ?
275 "hop" : "dest");
276 return -EINVAL;
277 }
278 break;
279
280 case NEXTHDR_ROUTING:
281 ipv6_rearrange_rthdr(iph, exthdr.rth);
282 break;
283
284 default :
285 return 0;
286 }
287
288 nexthdr = exthdr.opth->nexthdr;
289 exthdr.raw += ipv6_optlen(exthdr.opth);
290 }
291
292 return 0;
293 }
294
295 static void ah6_output_done(struct crypto_async_request *base, int err)
296 {
297 int extlen;
298 u8 *iph_base;
299 u8 *icv;
300 struct sk_buff *skb = base->data;
301 struct xfrm_state *x = skb_dst(skb)->xfrm;
302 struct ah_data *ahp = x->data;
303 struct ipv6hdr *top_iph = ipv6_hdr(skb);
304 struct ip_auth_hdr *ah = ip_auth_hdr(skb);
305 struct tmp_ext *iph_ext;
306
307 extlen = skb_network_header_len(skb) - sizeof(struct ipv6hdr);
308 if (extlen)
309 extlen += sizeof(*iph_ext);
310
311 iph_base = AH_SKB_CB(skb)->tmp;
312 iph_ext = ah_tmp_ext(iph_base);
313 icv = ah_tmp_icv(ahp->ahash, iph_ext, extlen);
314
315 memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
316 memcpy(top_iph, iph_base, IPV6HDR_BASELEN);
317
318 if (extlen) {
319 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
320 memcpy(&top_iph->saddr, iph_ext, extlen);
321 #else
322 memcpy(&top_iph->daddr, iph_ext, extlen);
323 #endif
324 }
325
326 err = ah->nexthdr;
327
328 kfree(AH_SKB_CB(skb)->tmp);
329 xfrm_output_resume(skb, err);
330 }
331
332 static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
333 {
334 int err;
335 int nfrags;
336 int extlen;
337 u8 *iph_base;
338 u8 *icv;
339 u8 nexthdr;
340 struct sk_buff *trailer;
341 struct crypto_ahash *ahash;
342 struct ahash_request *req;
343 struct scatterlist *sg;
344 struct ipv6hdr *top_iph;
345 struct ip_auth_hdr *ah;
346 struct ah_data *ahp;
347 struct tmp_ext *iph_ext;
348
349 ahp = x->data;
350 ahash = ahp->ahash;
351
352 if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
353 goto out;
354 nfrags = err;
355
356 skb_push(skb, -skb_network_offset(skb));
357 extlen = skb_network_header_len(skb) - sizeof(struct ipv6hdr);
358 if (extlen)
359 extlen += sizeof(*iph_ext);
360
361 err = -ENOMEM;
362 iph_base = ah_alloc_tmp(ahash, nfrags, IPV6HDR_BASELEN + extlen);
363 if (!iph_base)
364 goto out;
365
366 iph_ext = ah_tmp_ext(iph_base);
367 icv = ah_tmp_icv(ahash, iph_ext, extlen);
368 req = ah_tmp_req(ahash, icv);
369 sg = ah_req_sg(ahash, req);
370
371 ah = ip_auth_hdr(skb);
372 memset(ah->auth_data, 0, ahp->icv_trunc_len);
373
374 top_iph = ipv6_hdr(skb);
375 top_iph->payload_len = htons(skb->len - sizeof(*top_iph));
376
377 nexthdr = *skb_mac_header(skb);
378 *skb_mac_header(skb) = IPPROTO_AH;
379
380 /* When there are no extension headers, we only need to save the first
381 * 8 bytes of the base IP header.
382 */
383 memcpy(iph_base, top_iph, IPV6HDR_BASELEN);
384
385 if (extlen) {
386 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
387 memcpy(iph_ext, &top_iph->saddr, extlen);
388 #else
389 memcpy(iph_ext, &top_iph->daddr, extlen);
390 #endif
391 err = ipv6_clear_mutable_options(top_iph,
392 extlen - sizeof(*iph_ext) +
393 sizeof(*top_iph),
394 XFRM_POLICY_OUT);
395 if (err)
396 goto out_free;
397 }
398
399 ah->nexthdr = nexthdr;
400
401 top_iph->priority = 0;
402 top_iph->flow_lbl[0] = 0;
403 top_iph->flow_lbl[1] = 0;
404 top_iph->flow_lbl[2] = 0;
405 top_iph->hop_limit = 0;
406
407 ah->hdrlen = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
408
409 ah->reserved = 0;
410 ah->spi = x->id.spi;
411 ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output);
412
413 sg_init_table(sg, nfrags);
414 skb_to_sgvec(skb, sg, 0, skb->len);
415
416 ahash_request_set_crypt(req, sg, icv, skb->len);
417 ahash_request_set_callback(req, 0, ah6_output_done, skb);
418
419 AH_SKB_CB(skb)->tmp = iph_base;
420
421 err = crypto_ahash_digest(req);
422 if (err) {
423 if (err == -EINPROGRESS)
424 goto out;
425
426 if (err == -EBUSY)
427 err = NET_XMIT_DROP;
428 goto out_free;
429 }
430
431 memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
432 memcpy(top_iph, iph_base, IPV6HDR_BASELEN);
433
434 if (extlen) {
435 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
436 memcpy(&top_iph->saddr, iph_ext, extlen);
437 #else
438 memcpy(&top_iph->daddr, iph_ext, extlen);
439 #endif
440 }
441
442 out_free:
443 kfree(iph_base);
444 out:
445 return err;
446 }
447
448 static void ah6_input_done(struct crypto_async_request *base, int err)
449 {
450 u8 *auth_data;
451 u8 *icv;
452 u8 *work_iph;
453 struct sk_buff *skb = base->data;
454 struct xfrm_state *x = xfrm_input_state(skb);
455 struct ah_data *ahp = x->data;
456 struct ip_auth_hdr *ah = ip_auth_hdr(skb);
457 int hdr_len = skb_network_header_len(skb);
458 int ah_hlen = (ah->hdrlen + 2) << 2;
459
460 work_iph = AH_SKB_CB(skb)->tmp;
461 auth_data = ah_tmp_auth(work_iph, hdr_len);
462 icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);
463
464 err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG: 0;
465 if (err)
466 goto out;
467
468 skb->network_header += ah_hlen;
469 memcpy(skb_network_header(skb), work_iph, hdr_len);
470 __skb_pull(skb, ah_hlen + hdr_len);
471 skb_set_transport_header(skb, -hdr_len);
472
473 err = ah->nexthdr;
474 out:
475 kfree(AH_SKB_CB(skb)->tmp);
476 xfrm_input_resume(skb, err);
477 }
478
479
480
481 static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
482 {
483 /*
484 * Before process AH
485 * [IPv6][Ext1][Ext2][AH][Dest][Payload]
486 * |<-------------->| hdr_len
487 *
488 * To erase AH:
489 * Keeping copy of cleared headers. After AH processing,
490 * Moving the pointer of skb->network_header by using skb_pull as long
491 * as AH header length. Then copy back the copy as long as hdr_len
492 * If destination header following AH exists, copy it into after [Ext2].
493 *
494 * |<>|[IPv6][Ext1][Ext2][Dest][Payload]
495 * There is offset of AH before IPv6 header after the process.
496 */
497
498 u8 *auth_data;
499 u8 *icv;
500 u8 *work_iph;
501 struct sk_buff *trailer;
502 struct crypto_ahash *ahash;
503 struct ahash_request *req;
504 struct scatterlist *sg;
505 struct ip_auth_hdr *ah;
506 struct ipv6hdr *ip6h;
507 struct ah_data *ahp;
508 u16 hdr_len;
509 u16 ah_hlen;
510 int nexthdr;
511 int nfrags;
512 int err = -ENOMEM;
513
514 if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr)))
515 goto out;
516
517 /* We are going to _remove_ AH header to keep sockets happy,
518 * so... Later this can change. */
519 if (skb_cloned(skb) &&
520 pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
521 goto out;
522
523 skb->ip_summed = CHECKSUM_NONE;
524
525 hdr_len = skb_network_header_len(skb);
526 ah = (struct ip_auth_hdr *)skb->data;
527 ahp = x->data;
528 ahash = ahp->ahash;
529
530 nexthdr = ah->nexthdr;
531 ah_hlen = (ah->hdrlen + 2) << 2;
532
533 if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) &&
534 ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len))
535 goto out;
536
537 if (!pskb_may_pull(skb, ah_hlen))
538 goto out;
539
540 ip6h = ipv6_hdr(skb);
541
542 skb_push(skb, hdr_len);
543
544 if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
545 goto out;
546 nfrags = err;
547
548 work_iph = ah_alloc_tmp(ahash, nfrags, hdr_len + ahp->icv_trunc_len);
549 if (!work_iph)
550 goto out;
551
552 auth_data = ah_tmp_auth(work_iph, hdr_len);
553 icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len);
554 req = ah_tmp_req(ahash, icv);
555 sg = ah_req_sg(ahash, req);
556
557 memcpy(work_iph, ip6h, hdr_len);
558 memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
559 memset(ah->auth_data, 0, ahp->icv_trunc_len);
560
561 if (ipv6_clear_mutable_options(ip6h, hdr_len, XFRM_POLICY_IN))
562 goto out_free;
563
564 ip6h->priority = 0;
565 ip6h->flow_lbl[0] = 0;
566 ip6h->flow_lbl[1] = 0;
567 ip6h->flow_lbl[2] = 0;
568 ip6h->hop_limit = 0;
569
570 sg_init_table(sg, nfrags);
571 skb_to_sgvec(skb, sg, 0, skb->len);
572
573 ahash_request_set_crypt(req, sg, icv, skb->len);
574 ahash_request_set_callback(req, 0, ah6_input_done, skb);
575
576 AH_SKB_CB(skb)->tmp = work_iph;
577
578 err = crypto_ahash_digest(req);
579 if (err) {
580 if (err == -EINPROGRESS)
581 goto out;
582
583 if (err == -EBUSY)
584 err = NET_XMIT_DROP;
585 goto out_free;
586 }
587
588 err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG: 0;
589 if (err)
590 goto out_free;
591
592 skb->network_header += ah_hlen;
593 memcpy(skb_network_header(skb), work_iph, hdr_len);
594 skb->transport_header = skb->network_header;
595 __skb_pull(skb, ah_hlen + hdr_len);
596
597 err = nexthdr;
598
599 out_free:
600 kfree(work_iph);
601 out:
602 return err;
603 }
604
605 static void ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
606 u8 type, u8 code, int offset, __be32 info)
607 {
608 struct net *net = dev_net(skb->dev);
609 struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
610 struct ip_auth_hdr *ah = (struct ip_auth_hdr*)(skb->data+offset);
611 struct xfrm_state *x;
612
613 if (type != ICMPV6_DEST_UNREACH &&
614 type != ICMPV6_PKT_TOOBIG)
615 return;
616
617 x = xfrm_state_lookup(net, (xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET6);
618 if (!x)
619 return;
620
621 NETDEBUG(KERN_DEBUG "pmtu discovery on SA AH/%08x/%pI6\n",
622 ntohl(ah->spi), &iph->daddr);
623
624 xfrm_state_put(x);
625 }
626
627 static int ah6_init_state(struct xfrm_state *x)
628 {
629 struct ah_data *ahp = NULL;
630 struct xfrm_algo_desc *aalg_desc;
631 struct crypto_ahash *ahash;
632
633 if (!x->aalg)
634 goto error;
635
636 if (x->encap)
637 goto error;
638
639 ahp = kzalloc(sizeof(*ahp), GFP_KERNEL);
640 if (ahp == NULL)
641 return -ENOMEM;
642
643 ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0);
644 if (IS_ERR(ahash))
645 goto error;
646
647 ahp->ahash = ahash;
648 if (crypto_ahash_setkey(ahash, x->aalg->alg_key,
649 (x->aalg->alg_key_len + 7) / 8))
650 goto error;
651
652 /*
653 * Lookup the algorithm description maintained by xfrm_algo,
654 * verify crypto transform properties, and store information
655 * we need for AH processing. This lookup cannot fail here
656 * after a successful crypto_alloc_hash().
657 */
658 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
659 BUG_ON(!aalg_desc);
660
661 if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
662 crypto_ahash_digestsize(ahash)) {
663 printk(KERN_INFO "AH: %s digestsize %u != %hu\n",
664 x->aalg->alg_name, crypto_ahash_digestsize(ahash),
665 aalg_desc->uinfo.auth.icv_fullbits/8);
666 goto error;
667 }
668
669 ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
670 ahp->icv_trunc_len = x->aalg->alg_trunc_len/8;
671
672 BUG_ON(ahp->icv_trunc_len > MAX_AH_AUTH_LEN);
673
674 x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +
675 ahp->icv_trunc_len);
676 switch (x->props.mode) {
677 case XFRM_MODE_BEET:
678 case XFRM_MODE_TRANSPORT:
679 break;
680 case XFRM_MODE_TUNNEL:
681 x->props.header_len += sizeof(struct ipv6hdr);
682 break;
683 default:
684 goto error;
685 }
686 x->data = ahp;
687
688 return 0;
689
690 error:
691 if (ahp) {
692 crypto_free_ahash(ahp->ahash);
693 kfree(ahp);
694 }
695 return -EINVAL;
696 }
697
698 static void ah6_destroy(struct xfrm_state *x)
699 {
700 struct ah_data *ahp = x->data;
701
702 if (!ahp)
703 return;
704
705 crypto_free_ahash(ahp->ahash);
706 kfree(ahp);
707 }
708
709 static const struct xfrm_type ah6_type =
710 {
711 .description = "AH6",
712 .owner = THIS_MODULE,
713 .proto = IPPROTO_AH,
714 .flags = XFRM_TYPE_REPLAY_PROT,
715 .init_state = ah6_init_state,
716 .destructor = ah6_destroy,
717 .input = ah6_input,
718 .output = ah6_output,
719 .hdr_offset = xfrm6_find_1stfragopt,
720 };
721
722 static const struct inet6_protocol ah6_protocol = {
723 .handler = xfrm6_rcv,
724 .err_handler = ah6_err,
725 .flags = INET6_PROTO_NOPOLICY,
726 };
727
728 static int __init ah6_init(void)
729 {
730 if (xfrm_register_type(&ah6_type, AF_INET6) < 0) {
731 printk(KERN_INFO "ipv6 ah init: can't add xfrm type\n");
732 return -EAGAIN;
733 }
734
735 if (inet6_add_protocol(&ah6_protocol, IPPROTO_AH) < 0) {
736 printk(KERN_INFO "ipv6 ah init: can't add protocol\n");
737 xfrm_unregister_type(&ah6_type, AF_INET6);
738 return -EAGAIN;
739 }
740
741 return 0;
742 }
743
744 static void __exit ah6_fini(void)
745 {
746 if (inet6_del_protocol(&ah6_protocol, IPPROTO_AH) < 0)
747 printk(KERN_INFO "ipv6 ah close: can't remove protocol\n");
748
749 if (xfrm_unregister_type(&ah6_type, AF_INET6) < 0)
750 printk(KERN_INFO "ipv6 ah close: can't remove xfrm type\n");
751
752 }
753
754 module_init(ah6_init);
755 module_exit(ah6_fini);
756
757 MODULE_LICENSE("GPL");
758 MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_AH);
Linux with added FPC-III support