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ARM: imx_v6_v7_defconfig: Enable staging video4linux drivers
[linux/fpc-iii.git] / net / ipv6 / esp6.c
blob9ed35473dcb53bd6ae52f8f86e1558410bbcd7b6
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, see <http://www.gnu.org/licenses/>.
16 *
17 * Authors
18 *
19 * Mitsuru KANDA @USAGI : IPv6 Support
20 * Kazunori MIYAZAWA @USAGI :
21 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
22 *
23 * This file is derived from net/ipv4/esp.c
24 */
25
26 #define pr_fmt(fmt) "IPv6: " fmt
27
28 #include <crypto/aead.h>
29 #include <crypto/authenc.h>
30 #include <linux/err.h>
31 #include <linux/module.h>
32 #include <net/ip.h>
33 #include <net/xfrm.h>
34 #include <net/esp.h>
35 #include <linux/scatterlist.h>
36 #include <linux/kernel.h>
37 #include <linux/pfkeyv2.h>
38 #include <linux/random.h>
39 #include <linux/slab.h>
40 #include <linux/spinlock.h>
41 #include <net/ip6_route.h>
42 #include <net/icmp.h>
43 #include <net/ipv6.h>
44 #include <net/protocol.h>
45 #include <linux/icmpv6.h>
46
47 #include <linux/highmem.h>
48
49 struct esp_skb_cb {
50 struct xfrm_skb_cb xfrm;
51 void *tmp;
52 };
53
54 #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
55
56 static u32 esp6_get_mtu(struct xfrm_state *x, int mtu);
57
58 /*
59 * Allocate an AEAD request structure with extra space for SG and IV.
60 *
61 * For alignment considerations the upper 32 bits of the sequence number are
62 * placed at the front, if present. Followed by the IV, the request and finally
63 * the SG list.
64 *
65 * TODO: Use spare space in skb for this where possible.
66 */
67 static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqihlen)
68 {
69 unsigned int len;
70
71 len = seqihlen;
72
73 len += crypto_aead_ivsize(aead);
74
75 if (len) {
76 len += crypto_aead_alignmask(aead) &
77 ~(crypto_tfm_ctx_alignment() - 1);
78 len = ALIGN(len, crypto_tfm_ctx_alignment());
79 }
80
81 len += sizeof(struct aead_request) + crypto_aead_reqsize(aead);
82 len = ALIGN(len, __alignof__(struct scatterlist));
83
84 len += sizeof(struct scatterlist) * nfrags;
85
86 return kmalloc(len, GFP_ATOMIC);
87 }
88
89 static inline __be32 *esp_tmp_seqhi(void *tmp)
90 {
91 return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32));
92 }
93
94 static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen)
95 {
96 return crypto_aead_ivsize(aead) ?
97 PTR_ALIGN((u8 *)tmp + seqhilen,
98 crypto_aead_alignmask(aead) + 1) : tmp + seqhilen;
99 }
100
101 static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
102 {
103 struct aead_request *req;
104
105 req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
106 crypto_tfm_ctx_alignment());
107 aead_request_set_tfm(req, aead);
108 return req;
109 }
110
111 static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
112 struct aead_request *req)
113 {
114 return (void *)ALIGN((unsigned long)(req + 1) +
115 crypto_aead_reqsize(aead),
116 __alignof__(struct scatterlist));
117 }
118
119 static void esp_ssg_unref(struct xfrm_state *x, void *tmp)
120 {
121 struct crypto_aead *aead = x->data;
122 int seqhilen = 0;
123 u8 *iv;
124 struct aead_request *req;
125 struct scatterlist *sg;
126
127 if (x->props.flags & XFRM_STATE_ESN)
128 seqhilen += sizeof(__be32);
129
130 iv = esp_tmp_iv(aead, tmp, seqhilen);
131 req = esp_tmp_req(aead, iv);
132
133 /* Unref skb_frag_pages in the src scatterlist if necessary.
134 * Skip the first sg which comes from skb->data.
135 */
136 if (req->src != req->dst)
137 for (sg = sg_next(req->src); sg; sg = sg_next(sg))
138 put_page(sg_page(sg));
139 }
140
141 static void esp_output_done(struct crypto_async_request *base, int err)
142 {
143 struct sk_buff *skb = base->data;
144 void *tmp;
145 struct dst_entry *dst = skb_dst(skb);
146 struct xfrm_state *x = dst->xfrm;
147
148 tmp = ESP_SKB_CB(skb)->tmp;
149 esp_ssg_unref(x, tmp);
150 kfree(tmp);
151 xfrm_output_resume(skb, err);
152 }
153
154 /* Move ESP header back into place. */
155 static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
156 {
157 struct ip_esp_hdr *esph = (void *)(skb->data + offset);
158 void *tmp = ESP_SKB_CB(skb)->tmp;
159 __be32 *seqhi = esp_tmp_seqhi(tmp);
160
161 esph->seq_no = esph->spi;
162 esph->spi = *seqhi;
163 }
164
165 static void esp_output_restore_header(struct sk_buff *skb)
166 {
167 esp_restore_header(skb, skb_transport_offset(skb) - sizeof(__be32));
168 }
169
170 static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb,
171 struct xfrm_state *x,
172 struct ip_esp_hdr *esph,
173 __be32 *seqhi)
174 {
175 /* For ESN we move the header forward by 4 bytes to
176 * accomodate the high bits. We will move it back after
177 * encryption.
178 */
179 if ((x->props.flags & XFRM_STATE_ESN)) {
180 struct xfrm_offload *xo = xfrm_offload(skb);
181
182 esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
183 *seqhi = esph->spi;
184 if (xo)
185 esph->seq_no = htonl(xo->seq.hi);
186 else
187 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
188 }
189
190 esph->spi = x->id.spi;
191
192 return esph;
193 }
194
195 static void esp_output_done_esn(struct crypto_async_request *base, int err)
196 {
197 struct sk_buff *skb = base->data;
198
199 esp_output_restore_header(skb);
200 esp_output_done(base, err);
201 }
202
203 static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
204 {
205 /* Fill padding... */
206 if (tfclen) {
207 memset(tail, 0, tfclen);
208 tail += tfclen;
209 }
210 do {
211 int i;
212 for (i = 0; i < plen - 2; i++)
213 tail[i] = i + 1;
214 } while (0);
215 tail[plen - 2] = plen - 2;
216 tail[plen - 1] = proto;
217 }
218
219 int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
220 {
221 u8 *tail;
222 u8 *vaddr;
223 int nfrags;
224 struct page *page;
225 struct sk_buff *trailer;
226 int tailen = esp->tailen;
227
228 if (!skb_cloned(skb)) {
229 if (tailen <= skb_availroom(skb)) {
230 nfrags = 1;
231 trailer = skb;
232 tail = skb_tail_pointer(trailer);
233
234 goto skip_cow;
235 } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
236 && !skb_has_frag_list(skb)) {
237 int allocsize;
238 struct sock *sk = skb->sk;
239 struct page_frag *pfrag = &x->xfrag;
240
241 esp->inplace = false;
242
243 allocsize = ALIGN(tailen, L1_CACHE_BYTES);
244
245 spin_lock_bh(&x->lock);
246
247 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
248 spin_unlock_bh(&x->lock);
249 goto cow;
250 }
251
252 page = pfrag->page;
253 get_page(page);
254
255 vaddr = kmap_atomic(page);
256
257 tail = vaddr + pfrag->offset;
258
259 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
260
261 kunmap_atomic(vaddr);
262
263 spin_unlock_bh(&x->lock);
264
265 nfrags = skb_shinfo(skb)->nr_frags;
266
267 __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
268 tailen);
269 skb_shinfo(skb)->nr_frags = ++nfrags;
270
271 pfrag->offset = pfrag->offset + allocsize;
272 nfrags++;
273
274 skb->len += tailen;
275 skb->data_len += tailen;
276 skb->truesize += tailen;
277 if (sk)
278 refcount_add(tailen, &sk->sk_wmem_alloc);
279
280 goto out;
281 }
282 }
283
284 cow:
285 nfrags = skb_cow_data(skb, tailen, &trailer);
286 if (nfrags < 0)
287 goto out;
288 tail = skb_tail_pointer(trailer);
289
290 skip_cow:
291 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
292 pskb_put(skb, trailer, tailen);
293
294 out:
295 return nfrags;
296 }
297 EXPORT_SYMBOL_GPL(esp6_output_head);
298
299 int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
300 {
301 u8 *iv;
302 int alen;
303 void *tmp;
304 int ivlen;
305 int assoclen;
306 int seqhilen;
307 __be32 *seqhi;
308 struct page *page;
309 struct ip_esp_hdr *esph;
310 struct aead_request *req;
311 struct crypto_aead *aead;
312 struct scatterlist *sg, *dsg;
313 int err = -ENOMEM;
314
315 assoclen = sizeof(struct ip_esp_hdr);
316 seqhilen = 0;
317
318 if (x->props.flags & XFRM_STATE_ESN) {
319 seqhilen += sizeof(__be32);
320 assoclen += sizeof(__be32);
321 }
322
323 aead = x->data;
324 alen = crypto_aead_authsize(aead);
325 ivlen = crypto_aead_ivsize(aead);
326
327 tmp = esp_alloc_tmp(aead, esp->nfrags + 2, seqhilen);
328 if (!tmp)
329 goto error;
330
331 seqhi = esp_tmp_seqhi(tmp);
332 iv = esp_tmp_iv(aead, tmp, seqhilen);
333 req = esp_tmp_req(aead, iv);
334 sg = esp_req_sg(aead, req);
335
336 if (esp->inplace)
337 dsg = sg;
338 else
339 dsg = &sg[esp->nfrags];
340
341 esph = esp_output_set_esn(skb, x, ip_esp_hdr(skb), seqhi);
342
343 sg_init_table(sg, esp->nfrags);
344 err = skb_to_sgvec(skb, sg,
345 (unsigned char *)esph - skb->data,
346 assoclen + ivlen + esp->clen + alen);
347 if (unlikely(err < 0))
348 goto error;
349
350 if (!esp->inplace) {
351 int allocsize;
352 struct page_frag *pfrag = &x->xfrag;
353
354 allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
355
356 spin_lock_bh(&x->lock);
357 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
358 spin_unlock_bh(&x->lock);
359 goto error;
360 }
361
362 skb_shinfo(skb)->nr_frags = 1;
363
364 page = pfrag->page;
365 get_page(page);
366 /* replace page frags in skb with new page */
367 __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
368 pfrag->offset = pfrag->offset + allocsize;
369 spin_unlock_bh(&x->lock);
370
371 sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
372 err = skb_to_sgvec(skb, dsg,
373 (unsigned char *)esph - skb->data,
374 assoclen + ivlen + esp->clen + alen);
375 if (unlikely(err < 0))
376 goto error;
377 }
378
379 if ((x->props.flags & XFRM_STATE_ESN))
380 aead_request_set_callback(req, 0, esp_output_done_esn, skb);
381 else
382 aead_request_set_callback(req, 0, esp_output_done, skb);
383
384 aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
385 aead_request_set_ad(req, assoclen);
386
387 memset(iv, 0, ivlen);
388 memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
389 min(ivlen, 8));
390
391 ESP_SKB_CB(skb)->tmp = tmp;
392 err = crypto_aead_encrypt(req);
393
394 switch (err) {
395 case -EINPROGRESS:
396 goto error;
397
398 case -EBUSY:
399 err = NET_XMIT_DROP;
400 break;
401
402 case 0:
403 if ((x->props.flags & XFRM_STATE_ESN))
404 esp_output_restore_header(skb);
405 }
406
407 if (sg != dsg)
408 esp_ssg_unref(x, tmp);
409 kfree(tmp);
410
411 error:
412 return err;
413 }
414 EXPORT_SYMBOL_GPL(esp6_output_tail);
415
416 static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
417 {
418 int alen;
419 int blksize;
420 struct ip_esp_hdr *esph;
421 struct crypto_aead *aead;
422 struct esp_info esp;
423
424 esp.inplace = true;
425
426 esp.proto = *skb_mac_header(skb);
427 *skb_mac_header(skb) = IPPROTO_ESP;
428
429 /* skb is pure payload to encrypt */
430
431 aead = x->data;
432 alen = crypto_aead_authsize(aead);
433
434 esp.tfclen = 0;
435 if (x->tfcpad) {
436 struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
437 u32 padto;
438
439 padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached));
440 if (skb->len < padto)
441 esp.tfclen = padto - skb->len;
442 }
443 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
444 esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
445 esp.plen = esp.clen - skb->len - esp.tfclen;
446 esp.tailen = esp.tfclen + esp.plen + alen;
447
448 esp.nfrags = esp6_output_head(x, skb, &esp);
449 if (esp.nfrags < 0)
450 return esp.nfrags;
451
452 esph = ip_esp_hdr(skb);
453 esph->spi = x->id.spi;
454
455 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
456 esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
457 ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
458
459 skb_push(skb, -skb_network_offset(skb));
460
461 return esp6_output_tail(x, skb, &esp);
462 }
463
464 int esp6_input_done2(struct sk_buff *skb, int err)
465 {
466 struct xfrm_state *x = xfrm_input_state(skb);
467 struct xfrm_offload *xo = xfrm_offload(skb);
468 struct crypto_aead *aead = x->data;
469 int alen = crypto_aead_authsize(aead);
470 int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
471 int elen = skb->len - hlen;
472 int hdr_len = skb_network_header_len(skb);
473 int padlen;
474 u8 nexthdr[2];
475
476 if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
477 kfree(ESP_SKB_CB(skb)->tmp);
478
479 if (unlikely(err))
480 goto out;
481
482 if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
483 BUG();
484
485 err = -EINVAL;
486 padlen = nexthdr[0];
487 if (padlen + 2 + alen >= elen) {
488 net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
489 padlen + 2, elen - alen);
490 goto out;
491 }
492
493 /* ... check padding bits here. Silly. :-) */
494
495 pskb_trim(skb, skb->len - alen - padlen - 2);
496 __skb_pull(skb, hlen);
497 if (x->props.mode == XFRM_MODE_TUNNEL)
498 skb_reset_transport_header(skb);
499 else
500 skb_set_transport_header(skb, -hdr_len);
501
502 err = nexthdr[1];
503
504 /* RFC4303: Drop dummy packets without any error */
505 if (err == IPPROTO_NONE)
506 err = -EINVAL;
507
508 out:
509 return err;
510 }
511 EXPORT_SYMBOL_GPL(esp6_input_done2);
512
513 static void esp_input_done(struct crypto_async_request *base, int err)
514 {
515 struct sk_buff *skb = base->data;
516
517 xfrm_input_resume(skb, esp6_input_done2(skb, err));
518 }
519
520 static void esp_input_restore_header(struct sk_buff *skb)
521 {
522 esp_restore_header(skb, 0);
523 __skb_pull(skb, 4);
524 }
525
526 static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
527 {
528 struct xfrm_state *x = xfrm_input_state(skb);
529 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)skb->data;
530
531 /* For ESN we move the header forward by 4 bytes to
532 * accomodate the high bits. We will move it back after
533 * decryption.
534 */
535 if ((x->props.flags & XFRM_STATE_ESN)) {
536 esph = skb_push(skb, 4);
537 *seqhi = esph->spi;
538 esph->spi = esph->seq_no;
539 esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
540 }
541 }
542
543 static void esp_input_done_esn(struct crypto_async_request *base, int err)
544 {
545 struct sk_buff *skb = base->data;
546
547 esp_input_restore_header(skb);
548 esp_input_done(base, err);
549 }
550
551 static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
552 {
553 struct ip_esp_hdr *esph;
554 struct crypto_aead *aead = x->data;
555 struct aead_request *req;
556 struct sk_buff *trailer;
557 int ivlen = crypto_aead_ivsize(aead);
558 int elen = skb->len - sizeof(*esph) - ivlen;
559 int nfrags;
560 int assoclen;
561 int seqhilen;
562 int ret = 0;
563 void *tmp;
564 __be32 *seqhi;
565 u8 *iv;
566 struct scatterlist *sg;
567
568 if (!pskb_may_pull(skb, sizeof(*esph) + ivlen)) {
569 ret = -EINVAL;
570 goto out;
571 }
572
573 if (elen <= 0) {
574 ret = -EINVAL;
575 goto out;
576 }
577
578 assoclen = sizeof(*esph);
579 seqhilen = 0;
580
581 if (x->props.flags & XFRM_STATE_ESN) {
582 seqhilen += sizeof(__be32);
583 assoclen += seqhilen;
584 }
585
586 if (!skb_cloned(skb)) {
587 if (!skb_is_nonlinear(skb)) {
588 nfrags = 1;
589
590 goto skip_cow;
591 } else if (!skb_has_frag_list(skb)) {
592 nfrags = skb_shinfo(skb)->nr_frags;
593 nfrags++;
594
595 goto skip_cow;
596 }
597 }
598
599 nfrags = skb_cow_data(skb, 0, &trailer);
600 if (nfrags < 0) {
601 ret = -EINVAL;
602 goto out;
603 }
604
605 skip_cow:
606 ret = -ENOMEM;
607 tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
608 if (!tmp)
609 goto out;
610
611 ESP_SKB_CB(skb)->tmp = tmp;
612 seqhi = esp_tmp_seqhi(tmp);
613 iv = esp_tmp_iv(aead, tmp, seqhilen);
614 req = esp_tmp_req(aead, iv);
615 sg = esp_req_sg(aead, req);
616
617 esp_input_set_header(skb, seqhi);
618
619 sg_init_table(sg, nfrags);
620 ret = skb_to_sgvec(skb, sg, 0, skb->len);
621 if (unlikely(ret < 0))
622 goto out;
623
624 skb->ip_summed = CHECKSUM_NONE;
625
626 if ((x->props.flags & XFRM_STATE_ESN))
627 aead_request_set_callback(req, 0, esp_input_done_esn, skb);
628 else
629 aead_request_set_callback(req, 0, esp_input_done, skb);
630
631 aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
632 aead_request_set_ad(req, assoclen);
633
634 ret = crypto_aead_decrypt(req);
635 if (ret == -EINPROGRESS)
636 goto out;
637
638 if ((x->props.flags & XFRM_STATE_ESN))
639 esp_input_restore_header(skb);
640
641 ret = esp6_input_done2(skb, ret);
642
643 out:
644 return ret;
645 }
646
647 static u32 esp6_get_mtu(struct xfrm_state *x, int mtu)
648 {
649 struct crypto_aead *aead = x->data;
650 u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
651 unsigned int net_adj;
652
653 if (x->props.mode != XFRM_MODE_TUNNEL)
654 net_adj = sizeof(struct ipv6hdr);
655 else
656 net_adj = 0;
657
658 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
659 net_adj) & ~(blksize - 1)) + net_adj - 2;
660 }
661
662 static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
663 u8 type, u8 code, int offset, __be32 info)
664 {
665 struct net *net = dev_net(skb->dev);
666 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
667 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
668 struct xfrm_state *x;
669
670 if (type != ICMPV6_PKT_TOOBIG &&
671 type != NDISC_REDIRECT)
672 return 0;
673
674 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
675 esph->spi, IPPROTO_ESP, AF_INET6);
676 if (!x)
677 return 0;
678
679 if (type == NDISC_REDIRECT)
680 ip6_redirect(skb, net, skb->dev->ifindex, 0,
681 sock_net_uid(net, NULL));
682 else
683 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
684 xfrm_state_put(x);
685
686 return 0;
687 }
688
689 static void esp6_destroy(struct xfrm_state *x)
690 {
691 struct crypto_aead *aead = x->data;
692
693 if (!aead)
694 return;
695
696 crypto_free_aead(aead);
697 }
698
699 static int esp_init_aead(struct xfrm_state *x)
700 {
701 char aead_name[CRYPTO_MAX_ALG_NAME];
702 struct crypto_aead *aead;
703 int err;
704 u32 mask = 0;
705
706 err = -ENAMETOOLONG;
707 if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
708 x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
709 goto error;
710
711 if (x->xso.offload_handle)
712 mask |= CRYPTO_ALG_ASYNC;
713
714 aead = crypto_alloc_aead(aead_name, 0, mask);
715 err = PTR_ERR(aead);
716 if (IS_ERR(aead))
717 goto error;
718
719 x->data = aead;
720
721 err = crypto_aead_setkey(aead, x->aead->alg_key,
722 (x->aead->alg_key_len + 7) / 8);
723 if (err)
724 goto error;
725
726 err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
727 if (err)
728 goto error;
729
730 error:
731 return err;
732 }
733
734 static int esp_init_authenc(struct xfrm_state *x)
735 {
736 struct crypto_aead *aead;
737 struct crypto_authenc_key_param *param;
738 struct rtattr *rta;
739 char *key;
740 char *p;
741 char authenc_name[CRYPTO_MAX_ALG_NAME];
742 unsigned int keylen;
743 int err;
744 u32 mask = 0;
745
746 err = -EINVAL;
747 if (!x->ealg)
748 goto error;
749
750 err = -ENAMETOOLONG;
751
752 if ((x->props.flags & XFRM_STATE_ESN)) {
753 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
754 "%s%sauthencesn(%s,%s)%s",
755 x->geniv ?: "", x->geniv ? "(" : "",
756 x->aalg ? x->aalg->alg_name : "digest_null",
757 x->ealg->alg_name,
758 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
759 goto error;
760 } else {
761 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
762 "%s%sauthenc(%s,%s)%s",
763 x->geniv ?: "", x->geniv ? "(" : "",
764 x->aalg ? x->aalg->alg_name : "digest_null",
765 x->ealg->alg_name,
766 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
767 goto error;
768 }
769
770 if (x->xso.offload_handle)
771 mask |= CRYPTO_ALG_ASYNC;
772
773 aead = crypto_alloc_aead(authenc_name, 0, mask);
774 err = PTR_ERR(aead);
775 if (IS_ERR(aead))
776 goto error;
777
778 x->data = aead;
779
780 keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
781 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
782 err = -ENOMEM;
783 key = kmalloc(keylen, GFP_KERNEL);
784 if (!key)
785 goto error;
786
787 p = key;
788 rta = (void *)p;
789 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
790 rta->rta_len = RTA_LENGTH(sizeof(*param));
791 param = RTA_DATA(rta);
792 p += RTA_SPACE(sizeof(*param));
793
794 if (x->aalg) {
795 struct xfrm_algo_desc *aalg_desc;
796
797 memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
798 p += (x->aalg->alg_key_len + 7) / 8;
799
800 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
801 BUG_ON(!aalg_desc);
802
803 err = -EINVAL;
804 if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
805 crypto_aead_authsize(aead)) {
806 pr_info("ESP: %s digestsize %u != %hu\n",
807 x->aalg->alg_name,
808 crypto_aead_authsize(aead),
809 aalg_desc->uinfo.auth.icv_fullbits / 8);
810 goto free_key;
811 }
812
813 err = crypto_aead_setauthsize(
814 aead, x->aalg->alg_trunc_len / 8);
815 if (err)
816 goto free_key;
817 }
818
819 param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
820 memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
821
822 err = crypto_aead_setkey(aead, key, keylen);
823
824 free_key:
825 kfree(key);
826
827 error:
828 return err;
829 }
830
831 static int esp6_init_state(struct xfrm_state *x)
832 {
833 struct crypto_aead *aead;
834 u32 align;
835 int err;
836
837 if (x->encap)
838 return -EINVAL;
839
840 x->data = NULL;
841
842 if (x->aead)
843 err = esp_init_aead(x);
844 else
845 err = esp_init_authenc(x);
846
847 if (err)
848 goto error;
849
850 aead = x->data;
851
852 x->props.header_len = sizeof(struct ip_esp_hdr) +
853 crypto_aead_ivsize(aead);
854 switch (x->props.mode) {
855 case XFRM_MODE_BEET:
856 if (x->sel.family != AF_INET6)
857 x->props.header_len += IPV4_BEET_PHMAXLEN +
858 (sizeof(struct ipv6hdr) - sizeof(struct iphdr));
859 break;
860 case XFRM_MODE_TRANSPORT:
861 break;
862 case XFRM_MODE_TUNNEL:
863 x->props.header_len += sizeof(struct ipv6hdr);
864 break;
865 default:
866 goto error;
867 }
868
869 align = ALIGN(crypto_aead_blocksize(aead), 4);
870 x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
871
872 error:
873 return err;
874 }
875
876 static int esp6_rcv_cb(struct sk_buff *skb, int err)
877 {
878 return 0;
879 }
880
881 static const struct xfrm_type esp6_type = {
882 .description = "ESP6",
883 .owner = THIS_MODULE,
884 .proto = IPPROTO_ESP,
885 .flags = XFRM_TYPE_REPLAY_PROT,
886 .init_state = esp6_init_state,
887 .destructor = esp6_destroy,
888 .get_mtu = esp6_get_mtu,
889 .input = esp6_input,
890 .output = esp6_output,
891 .hdr_offset = xfrm6_find_1stfragopt,
892 };
893
894 static struct xfrm6_protocol esp6_protocol = {
895 .handler = xfrm6_rcv,
896 .cb_handler = esp6_rcv_cb,
897 .err_handler = esp6_err,
898 .priority = 0,
899 };
900
901 static int __init esp6_init(void)
902 {
903 if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
904 pr_info("%s: can't add xfrm type\n", __func__);
905 return -EAGAIN;
906 }
907 if (xfrm6_protocol_register(&esp6_protocol, IPPROTO_ESP) < 0) {
908 pr_info("%s: can't add protocol\n", __func__);
909 xfrm_unregister_type(&esp6_type, AF_INET6);
910 return -EAGAIN;
911 }
912
913 return 0;
914 }
915
916 static void __exit esp6_fini(void)
917 {
918 if (xfrm6_protocol_deregister(&esp6_protocol, IPPROTO_ESP) < 0)
919 pr_info("%s: can't remove protocol\n", __func__);
920 if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0)
921 pr_info("%s: can't remove xfrm type\n", __func__);
922 }
923
924 module_init(esp6_init);
925 module_exit(esp6_fini);
926
927 MODULE_LICENSE("GPL");
928 MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);
Linux with added FPC-III support