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Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...
[linux/fpc-iii.git] / net / tls / tls_sw.c
blob73d19210dd497193ff545ee15305113e6090f731
1 /*
2 * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
3 * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
4 * Copyright (c) 2016-2017, Lance Chao <lancerchao@fb.com>. All rights reserved.
5 * Copyright (c) 2016, Fridolin Pokorny <fridolin.pokorny@gmail.com>. All rights reserved.
6 * Copyright (c) 2016, Nikos Mavrogiannopoulos <nmav@gnutls.org>. All rights reserved.
7 *
8 * This software is available to you under a choice of one of two
9 * licenses. You may choose to be licensed under the terms of the GNU
10 * General Public License (GPL) Version 2, available from the file
11 * COPYING in the main directory of this source tree, or the
12 * OpenIB.org BSD license below:
13 *
14 * Redistribution and use in source and binary forms, with or
15 * without modification, are permitted provided that the following
16 * conditions are met:
17 *
18 * - Redistributions of source code must retain the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer.
21 *
22 * - Redistributions in binary form must reproduce the above
23 * copyright notice, this list of conditions and the following
24 * disclaimer in the documentation and/or other materials
25 * provided with the distribution.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 * SOFTWARE.
35 */
36
37 #include <linux/module.h>
38 #include <crypto/aead.h>
39
40 #include <net/tls.h>
41
42 static void trim_sg(struct sock *sk, struct scatterlist *sg,
43 int *sg_num_elem, unsigned int *sg_size, int target_size)
44 {
45 int i = *sg_num_elem - 1;
46 int trim = *sg_size - target_size;
47
48 if (trim <= 0) {
49 WARN_ON(trim < 0);
50 return;
51 }
52
53 *sg_size = target_size;
54 while (trim >= sg[i].length) {
55 trim -= sg[i].length;
56 sk_mem_uncharge(sk, sg[i].length);
57 put_page(sg_page(&sg[i]));
58 i--;
59
60 if (i < 0)
61 goto out;
62 }
63
64 sg[i].length -= trim;
65 sk_mem_uncharge(sk, trim);
66
67 out:
68 *sg_num_elem = i + 1;
69 }
70
71 static void trim_both_sgl(struct sock *sk, int target_size)
72 {
73 struct tls_context *tls_ctx = tls_get_ctx(sk);
74 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
75
76 trim_sg(sk, ctx->sg_plaintext_data,
77 &ctx->sg_plaintext_num_elem,
78 &ctx->sg_plaintext_size,
79 target_size);
80
81 if (target_size > 0)
82 target_size += tls_ctx->overhead_size;
83
84 trim_sg(sk, ctx->sg_encrypted_data,
85 &ctx->sg_encrypted_num_elem,
86 &ctx->sg_encrypted_size,
87 target_size);
88 }
89
90 static int alloc_sg(struct sock *sk, int len, struct scatterlist *sg,
91 int *sg_num_elem, unsigned int *sg_size,
92 int first_coalesce)
93 {
94 struct page_frag *pfrag;
95 unsigned int size = *sg_size;
96 int num_elem = *sg_num_elem, use = 0, rc = 0;
97 struct scatterlist *sge;
98 unsigned int orig_offset;
99
100 len -= size;
101 pfrag = sk_page_frag(sk);
102
103 while (len > 0) {
104 if (!sk_page_frag_refill(sk, pfrag)) {
105 rc = -ENOMEM;
106 goto out;
107 }
108
109 use = min_t(int, len, pfrag->size - pfrag->offset);
110
111 if (!sk_wmem_schedule(sk, use)) {
112 rc = -ENOMEM;
113 goto out;
114 }
115
116 sk_mem_charge(sk, use);
117 size += use;
118 orig_offset = pfrag->offset;
119 pfrag->offset += use;
120
121 sge = sg + num_elem - 1;
122 if (num_elem > first_coalesce && sg_page(sg) == pfrag->page &&
123 sg->offset + sg->length == orig_offset) {
124 sg->length += use;
125 } else {
126 sge++;
127 sg_unmark_end(sge);
128 sg_set_page(sge, pfrag->page, use, orig_offset);
129 get_page(pfrag->page);
130 ++num_elem;
131 if (num_elem == MAX_SKB_FRAGS) {
132 rc = -ENOSPC;
133 break;
134 }
135 }
136
137 len -= use;
138 }
139 goto out;
140
141 out:
142 *sg_size = size;
143 *sg_num_elem = num_elem;
144 return rc;
145 }
146
147 static int alloc_encrypted_sg(struct sock *sk, int len)
148 {
149 struct tls_context *tls_ctx = tls_get_ctx(sk);
150 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
151 int rc = 0;
152
153 rc = alloc_sg(sk, len, ctx->sg_encrypted_data,
154 &ctx->sg_encrypted_num_elem, &ctx->sg_encrypted_size, 0);
155
156 return rc;
157 }
158
159 static int alloc_plaintext_sg(struct sock *sk, int len)
160 {
161 struct tls_context *tls_ctx = tls_get_ctx(sk);
162 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
163 int rc = 0;
164
165 rc = alloc_sg(sk, len, ctx->sg_plaintext_data,
166 &ctx->sg_plaintext_num_elem, &ctx->sg_plaintext_size,
167 tls_ctx->pending_open_record_frags);
168
169 return rc;
170 }
171
172 static void free_sg(struct sock *sk, struct scatterlist *sg,
173 int *sg_num_elem, unsigned int *sg_size)
174 {
175 int i, n = *sg_num_elem;
176
177 for (i = 0; i < n; ++i) {
178 sk_mem_uncharge(sk, sg[i].length);
179 put_page(sg_page(&sg[i]));
180 }
181 *sg_num_elem = 0;
182 *sg_size = 0;
183 }
184
185 static void tls_free_both_sg(struct sock *sk)
186 {
187 struct tls_context *tls_ctx = tls_get_ctx(sk);
188 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
189
190 free_sg(sk, ctx->sg_encrypted_data, &ctx->sg_encrypted_num_elem,
191 &ctx->sg_encrypted_size);
192
193 free_sg(sk, ctx->sg_plaintext_data, &ctx->sg_plaintext_num_elem,
194 &ctx->sg_plaintext_size);
195 }
196
197 static int tls_do_encryption(struct tls_context *tls_ctx,
198 struct tls_sw_context *ctx, size_t data_len,
199 gfp_t flags)
200 {
201 unsigned int req_size = sizeof(struct aead_request) +
202 crypto_aead_reqsize(ctx->aead_send);
203 struct aead_request *aead_req;
204 int rc;
205
206 aead_req = kzalloc(req_size, flags);
207 if (!aead_req)
208 return -ENOMEM;
209
210 ctx->sg_encrypted_data[0].offset += tls_ctx->prepend_size;
211 ctx->sg_encrypted_data[0].length -= tls_ctx->prepend_size;
212
213 aead_request_set_tfm(aead_req, ctx->aead_send);
214 aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE);
215 aead_request_set_crypt(aead_req, ctx->sg_aead_in, ctx->sg_aead_out,
216 data_len, tls_ctx->iv);
217 rc = crypto_aead_encrypt(aead_req);
218
219 ctx->sg_encrypted_data[0].offset -= tls_ctx->prepend_size;
220 ctx->sg_encrypted_data[0].length += tls_ctx->prepend_size;
221
222 kfree(aead_req);
223 return rc;
224 }
225
226 static int tls_push_record(struct sock *sk, int flags,
227 unsigned char record_type)
228 {
229 struct tls_context *tls_ctx = tls_get_ctx(sk);
230 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
231 int rc;
232
233 sg_mark_end(ctx->sg_plaintext_data + ctx->sg_plaintext_num_elem - 1);
234 sg_mark_end(ctx->sg_encrypted_data + ctx->sg_encrypted_num_elem - 1);
235
236 tls_make_aad(ctx->aad_space, ctx->sg_plaintext_size,
237 tls_ctx->rec_seq, tls_ctx->rec_seq_size,
238 record_type);
239
240 tls_fill_prepend(tls_ctx,
241 page_address(sg_page(&ctx->sg_encrypted_data[0])) +
242 ctx->sg_encrypted_data[0].offset,
243 ctx->sg_plaintext_size, record_type);
244
245 tls_ctx->pending_open_record_frags = 0;
246 set_bit(TLS_PENDING_CLOSED_RECORD, &tls_ctx->flags);
247
248 rc = tls_do_encryption(tls_ctx, ctx, ctx->sg_plaintext_size,
249 sk->sk_allocation);
250 if (rc < 0) {
251 /* If we are called from write_space and
252 * we fail, we need to set this SOCK_NOSPACE
253 * to trigger another write_space in the future.
254 */
255 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
256 return rc;
257 }
258
259 free_sg(sk, ctx->sg_plaintext_data, &ctx->sg_plaintext_num_elem,
260 &ctx->sg_plaintext_size);
261
262 ctx->sg_encrypted_num_elem = 0;
263 ctx->sg_encrypted_size = 0;
264
265 /* Only pass through MSG_DONTWAIT and MSG_NOSIGNAL flags */
266 rc = tls_push_sg(sk, tls_ctx, ctx->sg_encrypted_data, 0, flags);
267 if (rc < 0 && rc != -EAGAIN)
268 tls_err_abort(sk);
269
270 tls_advance_record_sn(sk, tls_ctx);
271 return rc;
272 }
273
274 static int tls_sw_push_pending_record(struct sock *sk, int flags)
275 {
276 return tls_push_record(sk, flags, TLS_RECORD_TYPE_DATA);
277 }
278
279 static int zerocopy_from_iter(struct sock *sk, struct iov_iter *from,
280 int length)
281 {
282 struct tls_context *tls_ctx = tls_get_ctx(sk);
283 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
284 struct page *pages[MAX_SKB_FRAGS];
285
286 size_t offset;
287 ssize_t copied, use;
288 int i = 0;
289 unsigned int size = ctx->sg_plaintext_size;
290 int num_elem = ctx->sg_plaintext_num_elem;
291 int rc = 0;
292 int maxpages;
293
294 while (length > 0) {
295 i = 0;
296 maxpages = ARRAY_SIZE(ctx->sg_plaintext_data) - num_elem;
297 if (maxpages == 0) {
298 rc = -EFAULT;
299 goto out;
300 }
301 copied = iov_iter_get_pages(from, pages,
302 length,
303 maxpages, &offset);
304 if (copied <= 0) {
305 rc = -EFAULT;
306 goto out;
307 }
308
309 iov_iter_advance(from, copied);
310
311 length -= copied;
312 size += copied;
313 while (copied) {
314 use = min_t(int, copied, PAGE_SIZE - offset);
315
316 sg_set_page(&ctx->sg_plaintext_data[num_elem],
317 pages[i], use, offset);
318 sg_unmark_end(&ctx->sg_plaintext_data[num_elem]);
319 sk_mem_charge(sk, use);
320
321 offset = 0;
322 copied -= use;
323
324 ++i;
325 ++num_elem;
326 }
327 }
328
329 out:
330 ctx->sg_plaintext_size = size;
331 ctx->sg_plaintext_num_elem = num_elem;
332 return rc;
333 }
334
335 static int memcopy_from_iter(struct sock *sk, struct iov_iter *from,
336 int bytes)
337 {
338 struct tls_context *tls_ctx = tls_get_ctx(sk);
339 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
340 struct scatterlist *sg = ctx->sg_plaintext_data;
341 int copy, i, rc = 0;
342
343 for (i = tls_ctx->pending_open_record_frags;
344 i < ctx->sg_plaintext_num_elem; ++i) {
345 copy = sg[i].length;
346 if (copy_from_iter(
347 page_address(sg_page(&sg[i])) + sg[i].offset,
348 copy, from) != copy) {
349 rc = -EFAULT;
350 goto out;
351 }
352 bytes -= copy;
353
354 ++tls_ctx->pending_open_record_frags;
355
356 if (!bytes)
357 break;
358 }
359
360 out:
361 return rc;
362 }
363
364 int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
365 {
366 struct tls_context *tls_ctx = tls_get_ctx(sk);
367 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
368 int ret = 0;
369 int required_size;
370 long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
371 bool eor = !(msg->msg_flags & MSG_MORE);
372 size_t try_to_copy, copied = 0;
373 unsigned char record_type = TLS_RECORD_TYPE_DATA;
374 int record_room;
375 bool full_record;
376 int orig_size;
377
378 if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL))
379 return -ENOTSUPP;
380
381 lock_sock(sk);
382
383 if (tls_complete_pending_work(sk, tls_ctx, msg->msg_flags, &timeo))
384 goto send_end;
385
386 if (unlikely(msg->msg_controllen)) {
387 ret = tls_proccess_cmsg(sk, msg, &record_type);
388 if (ret)
389 goto send_end;
390 }
391
392 while (msg_data_left(msg)) {
393 if (sk->sk_err) {
394 ret = sk->sk_err;
395 goto send_end;
396 }
397
398 orig_size = ctx->sg_plaintext_size;
399 full_record = false;
400 try_to_copy = msg_data_left(msg);
401 record_room = TLS_MAX_PAYLOAD_SIZE - ctx->sg_plaintext_size;
402 if (try_to_copy >= record_room) {
403 try_to_copy = record_room;
404 full_record = true;
405 }
406
407 required_size = ctx->sg_plaintext_size + try_to_copy +
408 tls_ctx->overhead_size;
409
410 if (!sk_stream_memory_free(sk))
411 goto wait_for_sndbuf;
412 alloc_encrypted:
413 ret = alloc_encrypted_sg(sk, required_size);
414 if (ret) {
415 if (ret != -ENOSPC)
416 goto wait_for_memory;
417
418 /* Adjust try_to_copy according to the amount that was
419 * actually allocated. The difference is due
420 * to max sg elements limit
421 */
422 try_to_copy -= required_size - ctx->sg_encrypted_size;
423 full_record = true;
424 }
425
426 if (full_record || eor) {
427 ret = zerocopy_from_iter(sk, &msg->msg_iter,
428 try_to_copy);
429 if (ret)
430 goto fallback_to_reg_send;
431
432 copied += try_to_copy;
433 ret = tls_push_record(sk, msg->msg_flags, record_type);
434 if (!ret)
435 continue;
436 if (ret == -EAGAIN)
437 goto send_end;
438
439 copied -= try_to_copy;
440 fallback_to_reg_send:
441 iov_iter_revert(&msg->msg_iter,
442 ctx->sg_plaintext_size - orig_size);
443 trim_sg(sk, ctx->sg_plaintext_data,
444 &ctx->sg_plaintext_num_elem,
445 &ctx->sg_plaintext_size,
446 orig_size);
447 }
448
449 required_size = ctx->sg_plaintext_size + try_to_copy;
450 alloc_plaintext:
451 ret = alloc_plaintext_sg(sk, required_size);
452 if (ret) {
453 if (ret != -ENOSPC)
454 goto wait_for_memory;
455
456 /* Adjust try_to_copy according to the amount that was
457 * actually allocated. The difference is due
458 * to max sg elements limit
459 */
460 try_to_copy -= required_size - ctx->sg_plaintext_size;
461 full_record = true;
462
463 trim_sg(sk, ctx->sg_encrypted_data,
464 &ctx->sg_encrypted_num_elem,
465 &ctx->sg_encrypted_size,
466 ctx->sg_plaintext_size +
467 tls_ctx->overhead_size);
468 }
469
470 ret = memcopy_from_iter(sk, &msg->msg_iter, try_to_copy);
471 if (ret)
472 goto trim_sgl;
473
474 copied += try_to_copy;
475 if (full_record || eor) {
476 push_record:
477 ret = tls_push_record(sk, msg->msg_flags, record_type);
478 if (ret) {
479 if (ret == -ENOMEM)
480 goto wait_for_memory;
481
482 goto send_end;
483 }
484 }
485
486 continue;
487
488 wait_for_sndbuf:
489 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
490 wait_for_memory:
491 ret = sk_stream_wait_memory(sk, &timeo);
492 if (ret) {
493 trim_sgl:
494 trim_both_sgl(sk, orig_size);
495 goto send_end;
496 }
497
498 if (tls_is_pending_closed_record(tls_ctx))
499 goto push_record;
500
501 if (ctx->sg_encrypted_size < required_size)
502 goto alloc_encrypted;
503
504 goto alloc_plaintext;
505 }
506
507 send_end:
508 ret = sk_stream_error(sk, msg->msg_flags, ret);
509
510 release_sock(sk);
511 return copied ? copied : ret;
512 }
513
514 int tls_sw_sendpage(struct sock *sk, struct page *page,
515 int offset, size_t size, int flags)
516 {
517 struct tls_context *tls_ctx = tls_get_ctx(sk);
518 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
519 int ret = 0;
520 long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
521 bool eor;
522 size_t orig_size = size;
523 unsigned char record_type = TLS_RECORD_TYPE_DATA;
524 struct scatterlist *sg;
525 bool full_record;
526 int record_room;
527
528 if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
529 MSG_SENDPAGE_NOTLAST))
530 return -ENOTSUPP;
531
532 /* No MSG_EOR from splice, only look at MSG_MORE */
533 eor = !(flags & (MSG_MORE | MSG_SENDPAGE_NOTLAST));
534
535 lock_sock(sk);
536
537 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
538
539 if (tls_complete_pending_work(sk, tls_ctx, flags, &timeo))
540 goto sendpage_end;
541
542 /* Call the sk_stream functions to manage the sndbuf mem. */
543 while (size > 0) {
544 size_t copy, required_size;
545
546 if (sk->sk_err) {
547 ret = sk->sk_err;
548 goto sendpage_end;
549 }
550
551 full_record = false;
552 record_room = TLS_MAX_PAYLOAD_SIZE - ctx->sg_plaintext_size;
553 copy = size;
554 if (copy >= record_room) {
555 copy = record_room;
556 full_record = true;
557 }
558 required_size = ctx->sg_plaintext_size + copy +
559 tls_ctx->overhead_size;
560
561 if (!sk_stream_memory_free(sk))
562 goto wait_for_sndbuf;
563 alloc_payload:
564 ret = alloc_encrypted_sg(sk, required_size);
565 if (ret) {
566 if (ret != -ENOSPC)
567 goto wait_for_memory;
568
569 /* Adjust copy according to the amount that was
570 * actually allocated. The difference is due
571 * to max sg elements limit
572 */
573 copy -= required_size - ctx->sg_plaintext_size;
574 full_record = true;
575 }
576
577 get_page(page);
578 sg = ctx->sg_plaintext_data + ctx->sg_plaintext_num_elem;
579 sg_set_page(sg, page, copy, offset);
580 ctx->sg_plaintext_num_elem++;
581
582 sk_mem_charge(sk, copy);
583 offset += copy;
584 size -= copy;
585 ctx->sg_plaintext_size += copy;
586 tls_ctx->pending_open_record_frags = ctx->sg_plaintext_num_elem;
587
588 if (full_record || eor ||
589 ctx->sg_plaintext_num_elem ==
590 ARRAY_SIZE(ctx->sg_plaintext_data)) {
591 push_record:
592 ret = tls_push_record(sk, flags, record_type);
593 if (ret) {
594 if (ret == -ENOMEM)
595 goto wait_for_memory;
596
597 goto sendpage_end;
598 }
599 }
600 continue;
601 wait_for_sndbuf:
602 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
603 wait_for_memory:
604 ret = sk_stream_wait_memory(sk, &timeo);
605 if (ret) {
606 trim_both_sgl(sk, ctx->sg_plaintext_size);
607 goto sendpage_end;
608 }
609
610 if (tls_is_pending_closed_record(tls_ctx))
611 goto push_record;
612
613 goto alloc_payload;
614 }
615
616 sendpage_end:
617 if (orig_size > size)
618 ret = orig_size - size;
619 else
620 ret = sk_stream_error(sk, flags, ret);
621
622 release_sock(sk);
623 return ret;
624 }
625
626 void tls_sw_free_tx_resources(struct sock *sk)
627 {
628 struct tls_context *tls_ctx = tls_get_ctx(sk);
629 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
630
631 if (ctx->aead_send)
632 crypto_free_aead(ctx->aead_send);
633
634 tls_free_both_sg(sk);
635
636 kfree(ctx);
637 kfree(tls_ctx);
638 }
639
640 int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx)
641 {
642 char keyval[TLS_CIPHER_AES_GCM_128_KEY_SIZE];
643 struct tls_crypto_info *crypto_info;
644 struct tls12_crypto_info_aes_gcm_128 *gcm_128_info;
645 struct tls_sw_context *sw_ctx;
646 u16 nonce_size, tag_size, iv_size, rec_seq_size;
647 char *iv, *rec_seq;
648 int rc = 0;
649
650 if (!ctx) {
651 rc = -EINVAL;
652 goto out;
653 }
654
655 if (ctx->priv_ctx) {
656 rc = -EEXIST;
657 goto out;
658 }
659
660 sw_ctx = kzalloc(sizeof(*sw_ctx), GFP_KERNEL);
661 if (!sw_ctx) {
662 rc = -ENOMEM;
663 goto out;
664 }
665
666 ctx->priv_ctx = (struct tls_offload_context *)sw_ctx;
667
668 crypto_info = &ctx->crypto_send;
669 switch (crypto_info->cipher_type) {
670 case TLS_CIPHER_AES_GCM_128: {
671 nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
672 tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE;
673 iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
674 iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv;
675 rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE;
676 rec_seq =
677 ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq;
678 gcm_128_info =
679 (struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
680 break;
681 }
682 default:
683 rc = -EINVAL;
684 goto out;
685 }
686
687 ctx->prepend_size = TLS_HEADER_SIZE + nonce_size;
688 ctx->tag_size = tag_size;
689 ctx->overhead_size = ctx->prepend_size + ctx->tag_size;
690 ctx->iv_size = iv_size;
691 ctx->iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
692 GFP_KERNEL);
693 if (!ctx->iv) {
694 rc = -ENOMEM;
695 goto out;
696 }
697 memcpy(ctx->iv, gcm_128_info->salt, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
698 memcpy(ctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size);
699 ctx->rec_seq_size = rec_seq_size;
700 ctx->rec_seq = kmalloc(rec_seq_size, GFP_KERNEL);
701 if (!ctx->rec_seq) {
702 rc = -ENOMEM;
703 goto free_iv;
704 }
705 memcpy(ctx->rec_seq, rec_seq, rec_seq_size);
706
707 sg_init_table(sw_ctx->sg_encrypted_data,
708 ARRAY_SIZE(sw_ctx->sg_encrypted_data));
709 sg_init_table(sw_ctx->sg_plaintext_data,
710 ARRAY_SIZE(sw_ctx->sg_plaintext_data));
711
712 sg_init_table(sw_ctx->sg_aead_in, 2);
713 sg_set_buf(&sw_ctx->sg_aead_in[0], sw_ctx->aad_space,
714 sizeof(sw_ctx->aad_space));
715 sg_unmark_end(&sw_ctx->sg_aead_in[1]);
716 sg_chain(sw_ctx->sg_aead_in, 2, sw_ctx->sg_plaintext_data);
717 sg_init_table(sw_ctx->sg_aead_out, 2);
718 sg_set_buf(&sw_ctx->sg_aead_out[0], sw_ctx->aad_space,
719 sizeof(sw_ctx->aad_space));
720 sg_unmark_end(&sw_ctx->sg_aead_out[1]);
721 sg_chain(sw_ctx->sg_aead_out, 2, sw_ctx->sg_encrypted_data);
722
723 if (!sw_ctx->aead_send) {
724 sw_ctx->aead_send = crypto_alloc_aead("gcm(aes)", 0, 0);
725 if (IS_ERR(sw_ctx->aead_send)) {
726 rc = PTR_ERR(sw_ctx->aead_send);
727 sw_ctx->aead_send = NULL;
728 goto free_rec_seq;
729 }
730 }
731
732 ctx->push_pending_record = tls_sw_push_pending_record;
733
734 memcpy(keyval, gcm_128_info->key, TLS_CIPHER_AES_GCM_128_KEY_SIZE);
735
736 rc = crypto_aead_setkey(sw_ctx->aead_send, keyval,
737 TLS_CIPHER_AES_GCM_128_KEY_SIZE);
738 if (rc)
739 goto free_aead;
740
741 rc = crypto_aead_setauthsize(sw_ctx->aead_send, ctx->tag_size);
742 if (!rc)
743 goto out;
744
745 free_aead:
746 crypto_free_aead(sw_ctx->aead_send);
747 sw_ctx->aead_send = NULL;
748 free_rec_seq:
749 kfree(ctx->rec_seq);
750 ctx->rec_seq = NULL;
751 free_iv:
752 kfree(ctx->iv);
753 ctx->iv = NULL;
754 out:
755 return rc;
756 }
Linux with added FPC-III support