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bus: mhi: core: Fix some error return code
[linux/fpc-iii.git] / net / ipv6 / esp6.c
blob11143d039f16d0e29124a63f58638756508dbc8d
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C)2002 USAGI/WIDE Project
4 *
5 * Authors
6 *
7 * Mitsuru KANDA @USAGI : IPv6 Support
8 * Kazunori MIYAZAWA @USAGI :
9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 *
11 * This file is derived from net/ipv4/esp.c
12 */
13
14 #define pr_fmt(fmt) "IPv6: " fmt
15
16 #include <crypto/aead.h>
17 #include <crypto/authenc.h>
18 #include <linux/err.h>
19 #include <linux/module.h>
20 #include <net/ip.h>
21 #include <net/xfrm.h>
22 #include <net/esp.h>
23 #include <linux/scatterlist.h>
24 #include <linux/kernel.h>
25 #include <linux/pfkeyv2.h>
26 #include <linux/random.h>
27 #include <linux/slab.h>
28 #include <linux/spinlock.h>
29 #include <net/ip6_route.h>
30 #include <net/icmp.h>
31 #include <net/ipv6.h>
32 #include <net/protocol.h>
33 #include <linux/icmpv6.h>
34
35 #include <linux/highmem.h>
36
37 struct esp_skb_cb {
38 struct xfrm_skb_cb xfrm;
39 void *tmp;
40 };
41
42 #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
43
44 /*
45 * Allocate an AEAD request structure with extra space for SG and IV.
46 *
47 * For alignment considerations the upper 32 bits of the sequence number are
48 * placed at the front, if present. Followed by the IV, the request and finally
49 * the SG list.
50 *
51 * TODO: Use spare space in skb for this where possible.
52 */
53 static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqihlen)
54 {
55 unsigned int len;
56
57 len = seqihlen;
58
59 len += crypto_aead_ivsize(aead);
60
61 if (len) {
62 len += crypto_aead_alignmask(aead) &
63 ~(crypto_tfm_ctx_alignment() - 1);
64 len = ALIGN(len, crypto_tfm_ctx_alignment());
65 }
66
67 len += sizeof(struct aead_request) + crypto_aead_reqsize(aead);
68 len = ALIGN(len, __alignof__(struct scatterlist));
69
70 len += sizeof(struct scatterlist) * nfrags;
71
72 return kmalloc(len, GFP_ATOMIC);
73 }
74
75 static inline __be32 *esp_tmp_seqhi(void *tmp)
76 {
77 return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32));
78 }
79
80 static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen)
81 {
82 return crypto_aead_ivsize(aead) ?
83 PTR_ALIGN((u8 *)tmp + seqhilen,
84 crypto_aead_alignmask(aead) + 1) : tmp + seqhilen;
85 }
86
87 static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
88 {
89 struct aead_request *req;
90
91 req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
92 crypto_tfm_ctx_alignment());
93 aead_request_set_tfm(req, aead);
94 return req;
95 }
96
97 static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
98 struct aead_request *req)
99 {
100 return (void *)ALIGN((unsigned long)(req + 1) +
101 crypto_aead_reqsize(aead),
102 __alignof__(struct scatterlist));
103 }
104
105 static void esp_ssg_unref(struct xfrm_state *x, void *tmp)
106 {
107 struct crypto_aead *aead = x->data;
108 int seqhilen = 0;
109 u8 *iv;
110 struct aead_request *req;
111 struct scatterlist *sg;
112
113 if (x->props.flags & XFRM_STATE_ESN)
114 seqhilen += sizeof(__be32);
115
116 iv = esp_tmp_iv(aead, tmp, seqhilen);
117 req = esp_tmp_req(aead, iv);
118
119 /* Unref skb_frag_pages in the src scatterlist if necessary.
120 * Skip the first sg which comes from skb->data.
121 */
122 if (req->src != req->dst)
123 for (sg = sg_next(req->src); sg; sg = sg_next(sg))
124 put_page(sg_page(sg));
125 }
126
127 static void esp_output_done(struct crypto_async_request *base, int err)
128 {
129 struct sk_buff *skb = base->data;
130 struct xfrm_offload *xo = xfrm_offload(skb);
131 void *tmp;
132 struct xfrm_state *x;
133
134 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
135 struct sec_path *sp = skb_sec_path(skb);
136
137 x = sp->xvec[sp->len - 1];
138 } else {
139 x = skb_dst(skb)->xfrm;
140 }
141
142 tmp = ESP_SKB_CB(skb)->tmp;
143 esp_ssg_unref(x, tmp);
144 kfree(tmp);
145
146 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
147 if (err) {
148 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
149 kfree_skb(skb);
150 return;
151 }
152
153 skb_push(skb, skb->data - skb_mac_header(skb));
154 secpath_reset(skb);
155 xfrm_dev_resume(skb);
156 } else {
157 xfrm_output_resume(skb, err);
158 }
159 }
160
161 /* Move ESP header back into place. */
162 static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
163 {
164 struct ip_esp_hdr *esph = (void *)(skb->data + offset);
165 void *tmp = ESP_SKB_CB(skb)->tmp;
166 __be32 *seqhi = esp_tmp_seqhi(tmp);
167
168 esph->seq_no = esph->spi;
169 esph->spi = *seqhi;
170 }
171
172 static void esp_output_restore_header(struct sk_buff *skb)
173 {
174 esp_restore_header(skb, skb_transport_offset(skb) - sizeof(__be32));
175 }
176
177 static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb,
178 struct xfrm_state *x,
179 struct ip_esp_hdr *esph,
180 __be32 *seqhi)
181 {
182 /* For ESN we move the header forward by 4 bytes to
183 * accomodate the high bits. We will move it back after
184 * encryption.
185 */
186 if ((x->props.flags & XFRM_STATE_ESN)) {
187 struct xfrm_offload *xo = xfrm_offload(skb);
188
189 esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
190 *seqhi = esph->spi;
191 if (xo)
192 esph->seq_no = htonl(xo->seq.hi);
193 else
194 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
195 }
196
197 esph->spi = x->id.spi;
198
199 return esph;
200 }
201
202 static void esp_output_done_esn(struct crypto_async_request *base, int err)
203 {
204 struct sk_buff *skb = base->data;
205
206 esp_output_restore_header(skb);
207 esp_output_done(base, err);
208 }
209
210 int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
211 {
212 u8 *tail;
213 u8 *vaddr;
214 int nfrags;
215 struct page *page;
216 struct sk_buff *trailer;
217 int tailen = esp->tailen;
218
219 if (!skb_cloned(skb)) {
220 if (tailen <= skb_tailroom(skb)) {
221 nfrags = 1;
222 trailer = skb;
223 tail = skb_tail_pointer(trailer);
224
225 goto skip_cow;
226 } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
227 && !skb_has_frag_list(skb)) {
228 int allocsize;
229 struct sock *sk = skb->sk;
230 struct page_frag *pfrag = &x->xfrag;
231
232 esp->inplace = false;
233
234 allocsize = ALIGN(tailen, L1_CACHE_BYTES);
235
236 spin_lock_bh(&x->lock);
237
238 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
239 spin_unlock_bh(&x->lock);
240 goto cow;
241 }
242
243 page = pfrag->page;
244 get_page(page);
245
246 vaddr = kmap_atomic(page);
247
248 tail = vaddr + pfrag->offset;
249
250 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
251
252 kunmap_atomic(vaddr);
253
254 nfrags = skb_shinfo(skb)->nr_frags;
255
256 __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
257 tailen);
258 skb_shinfo(skb)->nr_frags = ++nfrags;
259
260 pfrag->offset = pfrag->offset + allocsize;
261
262 spin_unlock_bh(&x->lock);
263
264 nfrags++;
265
266 skb->len += tailen;
267 skb->data_len += tailen;
268 skb->truesize += tailen;
269 if (sk && sk_fullsock(sk))
270 refcount_add(tailen, &sk->sk_wmem_alloc);
271
272 goto out;
273 }
274 }
275
276 cow:
277 nfrags = skb_cow_data(skb, tailen, &trailer);
278 if (nfrags < 0)
279 goto out;
280 tail = skb_tail_pointer(trailer);
281
282 skip_cow:
283 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
284 pskb_put(skb, trailer, tailen);
285
286 out:
287 return nfrags;
288 }
289 EXPORT_SYMBOL_GPL(esp6_output_head);
290
291 int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
292 {
293 u8 *iv;
294 int alen;
295 void *tmp;
296 int ivlen;
297 int assoclen;
298 int seqhilen;
299 __be32 *seqhi;
300 struct page *page;
301 struct ip_esp_hdr *esph;
302 struct aead_request *req;
303 struct crypto_aead *aead;
304 struct scatterlist *sg, *dsg;
305 int err = -ENOMEM;
306
307 assoclen = sizeof(struct ip_esp_hdr);
308 seqhilen = 0;
309
310 if (x->props.flags & XFRM_STATE_ESN) {
311 seqhilen += sizeof(__be32);
312 assoclen += sizeof(__be32);
313 }
314
315 aead = x->data;
316 alen = crypto_aead_authsize(aead);
317 ivlen = crypto_aead_ivsize(aead);
318
319 tmp = esp_alloc_tmp(aead, esp->nfrags + 2, seqhilen);
320 if (!tmp)
321 goto error;
322
323 seqhi = esp_tmp_seqhi(tmp);
324 iv = esp_tmp_iv(aead, tmp, seqhilen);
325 req = esp_tmp_req(aead, iv);
326 sg = esp_req_sg(aead, req);
327
328 if (esp->inplace)
329 dsg = sg;
330 else
331 dsg = &sg[esp->nfrags];
332
333 esph = esp_output_set_esn(skb, x, ip_esp_hdr(skb), seqhi);
334
335 sg_init_table(sg, esp->nfrags);
336 err = skb_to_sgvec(skb, sg,
337 (unsigned char *)esph - skb->data,
338 assoclen + ivlen + esp->clen + alen);
339 if (unlikely(err < 0))
340 goto error_free;
341
342 if (!esp->inplace) {
343 int allocsize;
344 struct page_frag *pfrag = &x->xfrag;
345
346 allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
347
348 spin_lock_bh(&x->lock);
349 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
350 spin_unlock_bh(&x->lock);
351 goto error_free;
352 }
353
354 skb_shinfo(skb)->nr_frags = 1;
355
356 page = pfrag->page;
357 get_page(page);
358 /* replace page frags in skb with new page */
359 __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
360 pfrag->offset = pfrag->offset + allocsize;
361 spin_unlock_bh(&x->lock);
362
363 sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
364 err = skb_to_sgvec(skb, dsg,
365 (unsigned char *)esph - skb->data,
366 assoclen + ivlen + esp->clen + alen);
367 if (unlikely(err < 0))
368 goto error_free;
369 }
370
371 if ((x->props.flags & XFRM_STATE_ESN))
372 aead_request_set_callback(req, 0, esp_output_done_esn, skb);
373 else
374 aead_request_set_callback(req, 0, esp_output_done, skb);
375
376 aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
377 aead_request_set_ad(req, assoclen);
378
379 memset(iv, 0, ivlen);
380 memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
381 min(ivlen, 8));
382
383 ESP_SKB_CB(skb)->tmp = tmp;
384 err = crypto_aead_encrypt(req);
385
386 switch (err) {
387 case -EINPROGRESS:
388 goto error;
389
390 case -ENOSPC:
391 err = NET_XMIT_DROP;
392 break;
393
394 case 0:
395 if ((x->props.flags & XFRM_STATE_ESN))
396 esp_output_restore_header(skb);
397 }
398
399 if (sg != dsg)
400 esp_ssg_unref(x, tmp);
401
402 error_free:
403 kfree(tmp);
404 error:
405 return err;
406 }
407 EXPORT_SYMBOL_GPL(esp6_output_tail);
408
409 static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
410 {
411 int alen;
412 int blksize;
413 struct ip_esp_hdr *esph;
414 struct crypto_aead *aead;
415 struct esp_info esp;
416
417 esp.inplace = true;
418
419 esp.proto = *skb_mac_header(skb);
420 *skb_mac_header(skb) = IPPROTO_ESP;
421
422 /* skb is pure payload to encrypt */
423
424 aead = x->data;
425 alen = crypto_aead_authsize(aead);
426
427 esp.tfclen = 0;
428 if (x->tfcpad) {
429 struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
430 u32 padto;
431
432 padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached));
433 if (skb->len < padto)
434 esp.tfclen = padto - skb->len;
435 }
436 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
437 esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
438 esp.plen = esp.clen - skb->len - esp.tfclen;
439 esp.tailen = esp.tfclen + esp.plen + alen;
440
441 esp.nfrags = esp6_output_head(x, skb, &esp);
442 if (esp.nfrags < 0)
443 return esp.nfrags;
444
445 esph = ip_esp_hdr(skb);
446 esph->spi = x->id.spi;
447
448 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
449 esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
450 ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
451
452 skb_push(skb, -skb_network_offset(skb));
453
454 return esp6_output_tail(x, skb, &esp);
455 }
456
457 static inline int esp_remove_trailer(struct sk_buff *skb)
458 {
459 struct xfrm_state *x = xfrm_input_state(skb);
460 struct xfrm_offload *xo = xfrm_offload(skb);
461 struct crypto_aead *aead = x->data;
462 int alen, hlen, elen;
463 int padlen, trimlen;
464 __wsum csumdiff;
465 u8 nexthdr[2];
466 int ret;
467
468 alen = crypto_aead_authsize(aead);
469 hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
470 elen = skb->len - hlen;
471
472 if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) {
473 ret = xo->proto;
474 goto out;
475 }
476
477 ret = skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2);
478 BUG_ON(ret);
479
480 ret = -EINVAL;
481 padlen = nexthdr[0];
482 if (padlen + 2 + alen >= elen) {
483 net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
484 padlen + 2, elen - alen);
485 goto out;
486 }
487
488 trimlen = alen + padlen + 2;
489 if (skb->ip_summed == CHECKSUM_COMPLETE) {
490 csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
491 skb->csum = csum_block_sub(skb->csum, csumdiff,
492 skb->len - trimlen);
493 }
494 pskb_trim(skb, skb->len - trimlen);
495
496 ret = nexthdr[1];
497
498 out:
499 return ret;
500 }
501
502 int esp6_input_done2(struct sk_buff *skb, int err)
503 {
504 struct xfrm_state *x = xfrm_input_state(skb);
505 struct xfrm_offload *xo = xfrm_offload(skb);
506 struct crypto_aead *aead = x->data;
507 int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
508 int hdr_len = skb_network_header_len(skb);
509
510 if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
511 kfree(ESP_SKB_CB(skb)->tmp);
512
513 if (unlikely(err))
514 goto out;
515
516 err = esp_remove_trailer(skb);
517 if (unlikely(err < 0))
518 goto out;
519
520 skb_postpull_rcsum(skb, skb_network_header(skb),
521 skb_network_header_len(skb));
522 skb_pull_rcsum(skb, hlen);
523 if (x->props.mode == XFRM_MODE_TUNNEL)
524 skb_reset_transport_header(skb);
525 else
526 skb_set_transport_header(skb, -hdr_len);
527
528 /* RFC4303: Drop dummy packets without any error */
529 if (err == IPPROTO_NONE)
530 err = -EINVAL;
531
532 out:
533 return err;
534 }
535 EXPORT_SYMBOL_GPL(esp6_input_done2);
536
537 static void esp_input_done(struct crypto_async_request *base, int err)
538 {
539 struct sk_buff *skb = base->data;
540
541 xfrm_input_resume(skb, esp6_input_done2(skb, err));
542 }
543
544 static void esp_input_restore_header(struct sk_buff *skb)
545 {
546 esp_restore_header(skb, 0);
547 __skb_pull(skb, 4);
548 }
549
550 static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
551 {
552 struct xfrm_state *x = xfrm_input_state(skb);
553
554 /* For ESN we move the header forward by 4 bytes to
555 * accomodate the high bits. We will move it back after
556 * decryption.
557 */
558 if ((x->props.flags & XFRM_STATE_ESN)) {
559 struct ip_esp_hdr *esph = skb_push(skb, 4);
560
561 *seqhi = esph->spi;
562 esph->spi = esph->seq_no;
563 esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
564 }
565 }
566
567 static void esp_input_done_esn(struct crypto_async_request *base, int err)
568 {
569 struct sk_buff *skb = base->data;
570
571 esp_input_restore_header(skb);
572 esp_input_done(base, err);
573 }
574
575 static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
576 {
577 struct crypto_aead *aead = x->data;
578 struct aead_request *req;
579 struct sk_buff *trailer;
580 int ivlen = crypto_aead_ivsize(aead);
581 int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen;
582 int nfrags;
583 int assoclen;
584 int seqhilen;
585 int ret = 0;
586 void *tmp;
587 __be32 *seqhi;
588 u8 *iv;
589 struct scatterlist *sg;
590
591 if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + ivlen)) {
592 ret = -EINVAL;
593 goto out;
594 }
595
596 if (elen <= 0) {
597 ret = -EINVAL;
598 goto out;
599 }
600
601 assoclen = sizeof(struct ip_esp_hdr);
602 seqhilen = 0;
603
604 if (x->props.flags & XFRM_STATE_ESN) {
605 seqhilen += sizeof(__be32);
606 assoclen += seqhilen;
607 }
608
609 if (!skb_cloned(skb)) {
610 if (!skb_is_nonlinear(skb)) {
611 nfrags = 1;
612
613 goto skip_cow;
614 } else if (!skb_has_frag_list(skb)) {
615 nfrags = skb_shinfo(skb)->nr_frags;
616 nfrags++;
617
618 goto skip_cow;
619 }
620 }
621
622 nfrags = skb_cow_data(skb, 0, &trailer);
623 if (nfrags < 0) {
624 ret = -EINVAL;
625 goto out;
626 }
627
628 skip_cow:
629 ret = -ENOMEM;
630 tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
631 if (!tmp)
632 goto out;
633
634 ESP_SKB_CB(skb)->tmp = tmp;
635 seqhi = esp_tmp_seqhi(tmp);
636 iv = esp_tmp_iv(aead, tmp, seqhilen);
637 req = esp_tmp_req(aead, iv);
638 sg = esp_req_sg(aead, req);
639
640 esp_input_set_header(skb, seqhi);
641
642 sg_init_table(sg, nfrags);
643 ret = skb_to_sgvec(skb, sg, 0, skb->len);
644 if (unlikely(ret < 0)) {
645 kfree(tmp);
646 goto out;
647 }
648
649 skb->ip_summed = CHECKSUM_NONE;
650
651 if ((x->props.flags & XFRM_STATE_ESN))
652 aead_request_set_callback(req, 0, esp_input_done_esn, skb);
653 else
654 aead_request_set_callback(req, 0, esp_input_done, skb);
655
656 aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
657 aead_request_set_ad(req, assoclen);
658
659 ret = crypto_aead_decrypt(req);
660 if (ret == -EINPROGRESS)
661 goto out;
662
663 if ((x->props.flags & XFRM_STATE_ESN))
664 esp_input_restore_header(skb);
665
666 ret = esp6_input_done2(skb, ret);
667
668 out:
669 return ret;
670 }
671
672 static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
673 u8 type, u8 code, int offset, __be32 info)
674 {
675 struct net *net = dev_net(skb->dev);
676 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
677 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
678 struct xfrm_state *x;
679
680 if (type != ICMPV6_PKT_TOOBIG &&
681 type != NDISC_REDIRECT)
682 return 0;
683
684 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
685 esph->spi, IPPROTO_ESP, AF_INET6);
686 if (!x)
687 return 0;
688
689 if (type == NDISC_REDIRECT)
690 ip6_redirect(skb, net, skb->dev->ifindex, 0,
691 sock_net_uid(net, NULL));
692 else
693 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
694 xfrm_state_put(x);
695
696 return 0;
697 }
698
699 static void esp6_destroy(struct xfrm_state *x)
700 {
701 struct crypto_aead *aead = x->data;
702
703 if (!aead)
704 return;
705
706 crypto_free_aead(aead);
707 }
708
709 static int esp_init_aead(struct xfrm_state *x)
710 {
711 char aead_name[CRYPTO_MAX_ALG_NAME];
712 struct crypto_aead *aead;
713 int err;
714
715 err = -ENAMETOOLONG;
716 if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
717 x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
718 goto error;
719
720 aead = crypto_alloc_aead(aead_name, 0, 0);
721 err = PTR_ERR(aead);
722 if (IS_ERR(aead))
723 goto error;
724
725 x->data = aead;
726
727 err = crypto_aead_setkey(aead, x->aead->alg_key,
728 (x->aead->alg_key_len + 7) / 8);
729 if (err)
730 goto error;
731
732 err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
733 if (err)
734 goto error;
735
736 error:
737 return err;
738 }
739
740 static int esp_init_authenc(struct xfrm_state *x)
741 {
742 struct crypto_aead *aead;
743 struct crypto_authenc_key_param *param;
744 struct rtattr *rta;
745 char *key;
746 char *p;
747 char authenc_name[CRYPTO_MAX_ALG_NAME];
748 unsigned int keylen;
749 int err;
750
751 err = -EINVAL;
752 if (!x->ealg)
753 goto error;
754
755 err = -ENAMETOOLONG;
756
757 if ((x->props.flags & XFRM_STATE_ESN)) {
758 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
759 "%s%sauthencesn(%s,%s)%s",
760 x->geniv ?: "", x->geniv ? "(" : "",
761 x->aalg ? x->aalg->alg_name : "digest_null",
762 x->ealg->alg_name,
763 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
764 goto error;
765 } else {
766 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
767 "%s%sauthenc(%s,%s)%s",
768 x->geniv ?: "", x->geniv ? "(" : "",
769 x->aalg ? x->aalg->alg_name : "digest_null",
770 x->ealg->alg_name,
771 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
772 goto error;
773 }
774
775 aead = crypto_alloc_aead(authenc_name, 0, 0);
776 err = PTR_ERR(aead);
777 if (IS_ERR(aead))
778 goto error;
779
780 x->data = aead;
781
782 keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
783 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
784 err = -ENOMEM;
785 key = kmalloc(keylen, GFP_KERNEL);
786 if (!key)
787 goto error;
788
789 p = key;
790 rta = (void *)p;
791 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
792 rta->rta_len = RTA_LENGTH(sizeof(*param));
793 param = RTA_DATA(rta);
794 p += RTA_SPACE(sizeof(*param));
795
796 if (x->aalg) {
797 struct xfrm_algo_desc *aalg_desc;
798
799 memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
800 p += (x->aalg->alg_key_len + 7) / 8;
801
802 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
803 BUG_ON(!aalg_desc);
804
805 err = -EINVAL;
806 if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
807 crypto_aead_authsize(aead)) {
808 pr_info("ESP: %s digestsize %u != %hu\n",
809 x->aalg->alg_name,
810 crypto_aead_authsize(aead),
811 aalg_desc->uinfo.auth.icv_fullbits / 8);
812 goto free_key;
813 }
814
815 err = crypto_aead_setauthsize(
816 aead, x->aalg->alg_trunc_len / 8);
817 if (err)
818 goto free_key;
819 }
820
821 param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
822 memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
823
824 err = crypto_aead_setkey(aead, key, keylen);
825
826 free_key:
827 kfree(key);
828
829 error:
830 return err;
831 }
832
833 static int esp6_init_state(struct xfrm_state *x)
834 {
835 struct crypto_aead *aead;
836 u32 align;
837 int err;
838
839 if (x->encap)
840 return -EINVAL;
841
842 x->data = NULL;
843
844 if (x->aead)
845 err = esp_init_aead(x);
846 else
847 err = esp_init_authenc(x);
848
849 if (err)
850 goto error;
851
852 aead = x->data;
853
854 x->props.header_len = sizeof(struct ip_esp_hdr) +
855 crypto_aead_ivsize(aead);
856 switch (x->props.mode) {
857 case XFRM_MODE_BEET:
858 if (x->sel.family != AF_INET6)
859 x->props.header_len += IPV4_BEET_PHMAXLEN +
860 (sizeof(struct ipv6hdr) - sizeof(struct iphdr));
861 break;
862 default:
863 case XFRM_MODE_TRANSPORT:
864 break;
865 case XFRM_MODE_TUNNEL:
866 x->props.header_len += sizeof(struct ipv6hdr);
867 break;
868 }
869
870 align = ALIGN(crypto_aead_blocksize(aead), 4);
871 x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
872
873 error:
874 return err;
875 }
876
877 static int esp6_rcv_cb(struct sk_buff *skb, int err)
878 {
879 return 0;
880 }
881
882 static const struct xfrm_type esp6_type = {
883 .description = "ESP6",
884 .owner = THIS_MODULE,
885 .proto = IPPROTO_ESP,
886 .flags = XFRM_TYPE_REPLAY_PROT,
887 .init_state = esp6_init_state,
888 .destructor = esp6_destroy,
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 xfrm_unregister_type(&esp6_type, AF_INET6);
921 }
922
923 module_init(esp6_init);
924 module_exit(esp6_fini);
925
926 MODULE_LICENSE("GPL");
927 MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);
Linux with added FPC-III support