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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/sched/signal.h>
38#include <linux/module.h>
39#include <crypto/aead.h>
40
41#include <net/strparser.h>
42#include <net/tls.h>
43
44#define MAX_IV_SIZE TLS_CIPHER_AES_GCM_128_IV_SIZE
45
46static int tls_do_decryption(struct sock *sk,
47 struct scatterlist *sgin,
48 struct scatterlist *sgout,
49 char *iv_recv,
50 size_t data_len,
51 struct sk_buff *skb,
52 gfp_t flags)
53{
54 struct tls_context *tls_ctx = tls_get_ctx(sk);
55 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
56 struct strp_msg *rxm = strp_msg(skb);
57 struct aead_request *aead_req;
58
59 int ret;
60 unsigned int req_size = sizeof(struct aead_request) +
61 crypto_aead_reqsize(ctx->aead_recv);
62
63 aead_req = kzalloc(req_size, flags);
64 if (!aead_req)
65 return -ENOMEM;
66
67 aead_request_set_tfm(aead_req, ctx->aead_recv);
68 aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE);
69 aead_request_set_crypt(aead_req, sgin, sgout,
70 data_len + tls_ctx->rx.tag_size,
71 (u8 *)iv_recv);
72 aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
73 crypto_req_done, &ctx->async_wait);
74
75 ret = crypto_wait_req(crypto_aead_decrypt(aead_req), &ctx->async_wait);
76
77 if (ret < 0)
78 goto out;
79
80 rxm->offset += tls_ctx->rx.prepend_size;
81 rxm->full_len -= tls_ctx->rx.overhead_size;
82 tls_advance_record_sn(sk, &tls_ctx->rx);
83
84 ctx->decrypted = true;
85
86 ctx->saved_data_ready(sk);
87
88out:
89 kfree(aead_req);
90 return ret;
91}
92
93static void trim_sg(struct sock *sk, struct scatterlist *sg,
94 int *sg_num_elem, unsigned int *sg_size, int target_size)
95{
96 int i = *sg_num_elem - 1;
97 int trim = *sg_size - target_size;
98
99 if (trim <= 0) {
100 WARN_ON(trim < 0);
101 return;
102 }
103
104 *sg_size = target_size;
105 while (trim >= sg[i].length) {
106 trim -= sg[i].length;
107 sk_mem_uncharge(sk, sg[i].length);
108 put_page(sg_page(&sg[i]));
109 i--;
110
111 if (i < 0)
112 goto out;
113 }
114
115 sg[i].length -= trim;
116 sk_mem_uncharge(sk, trim);
117
118out:
119 *sg_num_elem = i + 1;
120}
121
122static void trim_both_sgl(struct sock *sk, int target_size)
123{
124 struct tls_context *tls_ctx = tls_get_ctx(sk);
125 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
126
127 trim_sg(sk, ctx->sg_plaintext_data,
128 &ctx->sg_plaintext_num_elem,
129 &ctx->sg_plaintext_size,
130 target_size);
131
132 if (target_size > 0)
133 target_size += tls_ctx->tx.overhead_size;
134
135 trim_sg(sk, ctx->sg_encrypted_data,
136 &ctx->sg_encrypted_num_elem,
137 &ctx->sg_encrypted_size,
138 target_size);
139}
140
141static int alloc_encrypted_sg(struct sock *sk, int len)
142{
143 struct tls_context *tls_ctx = tls_get_ctx(sk);
144 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
145 int rc = 0;
146
147 rc = sk_alloc_sg(sk, len,
148 ctx->sg_encrypted_data, 0,
149 &ctx->sg_encrypted_num_elem,
150 &ctx->sg_encrypted_size, 0);
151
152 return rc;
153}
154
155static int alloc_plaintext_sg(struct sock *sk, int len)
156{
157 struct tls_context *tls_ctx = tls_get_ctx(sk);
158 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
159 int rc = 0;
160
161 rc = sk_alloc_sg(sk, len, ctx->sg_plaintext_data, 0,
162 &ctx->sg_plaintext_num_elem, &ctx->sg_plaintext_size,
163 tls_ctx->pending_open_record_frags);
164
165 return rc;
166}
167
168static void free_sg(struct sock *sk, struct scatterlist *sg,
169 int *sg_num_elem, unsigned int *sg_size)
170{
171 int i, n = *sg_num_elem;
172
173 for (i = 0; i < n; ++i) {
174 sk_mem_uncharge(sk, sg[i].length);
175 put_page(sg_page(&sg[i]));
176 }
177 *sg_num_elem = 0;
178 *sg_size = 0;
179}
180
181static void tls_free_both_sg(struct sock *sk)
182{
183 struct tls_context *tls_ctx = tls_get_ctx(sk);
184 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
185
186 free_sg(sk, ctx->sg_encrypted_data, &ctx->sg_encrypted_num_elem,
187 &ctx->sg_encrypted_size);
188
189 free_sg(sk, ctx->sg_plaintext_data, &ctx->sg_plaintext_num_elem,
190 &ctx->sg_plaintext_size);
191}
192
193static int tls_do_encryption(struct tls_context *tls_ctx,
194 struct tls_sw_context *ctx, size_t data_len,
195 gfp_t flags)
196{
197 unsigned int req_size = sizeof(struct aead_request) +
198 crypto_aead_reqsize(ctx->aead_send);
199 struct aead_request *aead_req;
200 int rc;
201
202 aead_req = kzalloc(req_size, flags);
203 if (!aead_req)
204 return -ENOMEM;
205
206 ctx->sg_encrypted_data[0].offset += tls_ctx->tx.prepend_size;
207 ctx->sg_encrypted_data[0].length -= tls_ctx->tx.prepend_size;
208
209 aead_request_set_tfm(aead_req, ctx->aead_send);
210 aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE);
211 aead_request_set_crypt(aead_req, ctx->sg_aead_in, ctx->sg_aead_out,
212 data_len, tls_ctx->tx.iv);
213
214 aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
215 crypto_req_done, &ctx->async_wait);
216
217 rc = crypto_wait_req(crypto_aead_encrypt(aead_req), &ctx->async_wait);
218
219 ctx->sg_encrypted_data[0].offset -= tls_ctx->tx.prepend_size;
220 ctx->sg_encrypted_data[0].length += tls_ctx->tx.prepend_size;
221
222 kfree(aead_req);
223 return rc;
224}
225
226static 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->tx.rec_seq, tls_ctx->tx.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, EBADMSG);
269
270 tls_advance_record_sn(sk, &tls_ctx->tx);
271 return rc;
272}
273
274static 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
279static int zerocopy_from_iter(struct sock *sk, struct iov_iter *from,
280 int length, int *pages_used,
281 unsigned int *size_used,
282 struct scatterlist *to, int to_max_pages,
283 bool charge)
284{
285 struct page *pages[MAX_SKB_FRAGS];
286
287 size_t offset;
288 ssize_t copied, use;
289 int i = 0;
290 unsigned int size = *size_used;
291 int num_elem = *pages_used;
292 int rc = 0;
293 int maxpages;
294
295 while (length > 0) {
296 i = 0;
297 maxpages = to_max_pages - num_elem;
298 if (maxpages == 0) {
299 rc = -EFAULT;
300 goto out;
301 }
302 copied = iov_iter_get_pages(from, pages,
303 length,
304 maxpages, &offset);
305 if (copied <= 0) {
306 rc = -EFAULT;
307 goto out;
308 }
309
310 iov_iter_advance(from, copied);
311
312 length -= copied;
313 size += copied;
314 while (copied) {
315 use = min_t(int, copied, PAGE_SIZE - offset);
316
317 sg_set_page(&to[num_elem],
318 pages[i], use, offset);
319 sg_unmark_end(&to[num_elem]);
320 if (charge)
321 sk_mem_charge(sk, use);
322
323 offset = 0;
324 copied -= use;
325
326 ++i;
327 ++num_elem;
328 }
329 }
330
331out:
332 *size_used = size;
333 *pages_used = num_elem;
334
335 return rc;
336}
337
338static int memcopy_from_iter(struct sock *sk, struct iov_iter *from,
339 int bytes)
340{
341 struct tls_context *tls_ctx = tls_get_ctx(sk);
342 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
343 struct scatterlist *sg = ctx->sg_plaintext_data;
344 int copy, i, rc = 0;
345
346 for (i = tls_ctx->pending_open_record_frags;
347 i < ctx->sg_plaintext_num_elem; ++i) {
348 copy = sg[i].length;
349 if (copy_from_iter(
350 page_address(sg_page(&sg[i])) + sg[i].offset,
351 copy, from) != copy) {
352 rc = -EFAULT;
353 goto out;
354 }
355 bytes -= copy;
356
357 ++tls_ctx->pending_open_record_frags;
358
359 if (!bytes)
360 break;
361 }
362
363out:
364 return rc;
365}
366
367int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
368{
369 struct tls_context *tls_ctx = tls_get_ctx(sk);
370 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
371 int ret = 0;
372 int required_size;
373 long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
374 bool eor = !(msg->msg_flags & MSG_MORE);
375 size_t try_to_copy, copied = 0;
376 unsigned char record_type = TLS_RECORD_TYPE_DATA;
377 int record_room;
378 bool full_record;
379 int orig_size;
380
381 if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL))
382 return -ENOTSUPP;
383
384 lock_sock(sk);
385
386 if (tls_complete_pending_work(sk, tls_ctx, msg->msg_flags, &timeo))
387 goto send_end;
388
389 if (unlikely(msg->msg_controllen)) {
390 ret = tls_proccess_cmsg(sk, msg, &record_type);
391 if (ret)
392 goto send_end;
393 }
394
395 while (msg_data_left(msg)) {
396 if (sk->sk_err) {
397 ret = -sk->sk_err;
398 goto send_end;
399 }
400
401 orig_size = ctx->sg_plaintext_size;
402 full_record = false;
403 try_to_copy = msg_data_left(msg);
404 record_room = TLS_MAX_PAYLOAD_SIZE - ctx->sg_plaintext_size;
405 if (try_to_copy >= record_room) {
406 try_to_copy = record_room;
407 full_record = true;
408 }
409
410 required_size = ctx->sg_plaintext_size + try_to_copy +
411 tls_ctx->tx.overhead_size;
412
413 if (!sk_stream_memory_free(sk))
414 goto wait_for_sndbuf;
415alloc_encrypted:
416 ret = alloc_encrypted_sg(sk, required_size);
417 if (ret) {
418 if (ret != -ENOSPC)
419 goto wait_for_memory;
420
421 /* Adjust try_to_copy according to the amount that was
422 * actually allocated. The difference is due
423 * to max sg elements limit
424 */
425 try_to_copy -= required_size - ctx->sg_encrypted_size;
426 full_record = true;
427 }
428
429 if (full_record || eor) {
430 ret = zerocopy_from_iter(sk, &msg->msg_iter,
431 try_to_copy, &ctx->sg_plaintext_num_elem,
432 &ctx->sg_plaintext_size,
433 ctx->sg_plaintext_data,
434 ARRAY_SIZE(ctx->sg_plaintext_data),
435 true);
436 if (ret)
437 goto fallback_to_reg_send;
438
439 copied += try_to_copy;
440 ret = tls_push_record(sk, msg->msg_flags, record_type);
441 if (!ret)
442 continue;
443 if (ret == -EAGAIN)
444 goto send_end;
445
446 copied -= try_to_copy;
447fallback_to_reg_send:
448 iov_iter_revert(&msg->msg_iter,
449 ctx->sg_plaintext_size - orig_size);
450 trim_sg(sk, ctx->sg_plaintext_data,
451 &ctx->sg_plaintext_num_elem,
452 &ctx->sg_plaintext_size,
453 orig_size);
454 }
455
456 required_size = ctx->sg_plaintext_size + try_to_copy;
457alloc_plaintext:
458 ret = alloc_plaintext_sg(sk, required_size);
459 if (ret) {
460 if (ret != -ENOSPC)
461 goto wait_for_memory;
462
463 /* Adjust try_to_copy according to the amount that was
464 * actually allocated. The difference is due
465 * to max sg elements limit
466 */
467 try_to_copy -= required_size - ctx->sg_plaintext_size;
468 full_record = true;
469
470 trim_sg(sk, ctx->sg_encrypted_data,
471 &ctx->sg_encrypted_num_elem,
472 &ctx->sg_encrypted_size,
473 ctx->sg_plaintext_size +
474 tls_ctx->tx.overhead_size);
475 }
476
477 ret = memcopy_from_iter(sk, &msg->msg_iter, try_to_copy);
478 if (ret)
479 goto trim_sgl;
480
481 copied += try_to_copy;
482 if (full_record || eor) {
483push_record:
484 ret = tls_push_record(sk, msg->msg_flags, record_type);
485 if (ret) {
486 if (ret == -ENOMEM)
487 goto wait_for_memory;
488
489 goto send_end;
490 }
491 }
492
493 continue;
494
495wait_for_sndbuf:
496 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
497wait_for_memory:
498 ret = sk_stream_wait_memory(sk, &timeo);
499 if (ret) {
500trim_sgl:
501 trim_both_sgl(sk, orig_size);
502 goto send_end;
503 }
504
505 if (tls_is_pending_closed_record(tls_ctx))
506 goto push_record;
507
508 if (ctx->sg_encrypted_size < required_size)
509 goto alloc_encrypted;
510
511 goto alloc_plaintext;
512 }
513
514send_end:
515 ret = sk_stream_error(sk, msg->msg_flags, ret);
516
517 release_sock(sk);
518 return copied ? copied : ret;
519}
520
521int tls_sw_sendpage(struct sock *sk, struct page *page,
522 int offset, size_t size, int flags)
523{
524 struct tls_context *tls_ctx = tls_get_ctx(sk);
525 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
526 int ret = 0;
527 long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
528 bool eor;
529 size_t orig_size = size;
530 unsigned char record_type = TLS_RECORD_TYPE_DATA;
531 struct scatterlist *sg;
532 bool full_record;
533 int record_room;
534
535 if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
536 MSG_SENDPAGE_NOTLAST))
537 return -ENOTSUPP;
538
539 /* No MSG_EOR from splice, only look at MSG_MORE */
540 eor = !(flags & (MSG_MORE | MSG_SENDPAGE_NOTLAST));
541
542 lock_sock(sk);
543
544 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
545
546 if (tls_complete_pending_work(sk, tls_ctx, flags, &timeo))
547 goto sendpage_end;
548
549 /* Call the sk_stream functions to manage the sndbuf mem. */
550 while (size > 0) {
551 size_t copy, required_size;
552
553 if (sk->sk_err) {
554 ret = -sk->sk_err;
555 goto sendpage_end;
556 }
557
558 full_record = false;
559 record_room = TLS_MAX_PAYLOAD_SIZE - ctx->sg_plaintext_size;
560 copy = size;
561 if (copy >= record_room) {
562 copy = record_room;
563 full_record = true;
564 }
565 required_size = ctx->sg_plaintext_size + copy +
566 tls_ctx->tx.overhead_size;
567
568 if (!sk_stream_memory_free(sk))
569 goto wait_for_sndbuf;
570alloc_payload:
571 ret = alloc_encrypted_sg(sk, required_size);
572 if (ret) {
573 if (ret != -ENOSPC)
574 goto wait_for_memory;
575
576 /* Adjust copy according to the amount that was
577 * actually allocated. The difference is due
578 * to max sg elements limit
579 */
580 copy -= required_size - ctx->sg_plaintext_size;
581 full_record = true;
582 }
583
584 get_page(page);
585 sg = ctx->sg_plaintext_data + ctx->sg_plaintext_num_elem;
586 sg_set_page(sg, page, copy, offset);
587 sg_unmark_end(sg);
588
589 ctx->sg_plaintext_num_elem++;
590
591 sk_mem_charge(sk, copy);
592 offset += copy;
593 size -= copy;
594 ctx->sg_plaintext_size += copy;
595 tls_ctx->pending_open_record_frags = ctx->sg_plaintext_num_elem;
596
597 if (full_record || eor ||
598 ctx->sg_plaintext_num_elem ==
599 ARRAY_SIZE(ctx->sg_plaintext_data)) {
600push_record:
601 ret = tls_push_record(sk, flags, record_type);
602 if (ret) {
603 if (ret == -ENOMEM)
604 goto wait_for_memory;
605
606 goto sendpage_end;
607 }
608 }
609 continue;
610wait_for_sndbuf:
611 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
612wait_for_memory:
613 ret = sk_stream_wait_memory(sk, &timeo);
614 if (ret) {
615 trim_both_sgl(sk, ctx->sg_plaintext_size);
616 goto sendpage_end;
617 }
618
619 if (tls_is_pending_closed_record(tls_ctx))
620 goto push_record;
621
622 goto alloc_payload;
623 }
624
625sendpage_end:
626 if (orig_size > size)
627 ret = orig_size - size;
628 else
629 ret = sk_stream_error(sk, flags, ret);
630
631 release_sock(sk);
632 return ret;
633}
634
635static struct sk_buff *tls_wait_data(struct sock *sk, int flags,
636 long timeo, int *err)
637{
638 struct tls_context *tls_ctx = tls_get_ctx(sk);
639 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
640 struct sk_buff *skb;
641 DEFINE_WAIT_FUNC(wait, woken_wake_function);
642
643 while (!(skb = ctx->recv_pkt)) {
644 if (sk->sk_err) {
645 *err = sock_error(sk);
646 return NULL;
647 }
648
649 if (sock_flag(sk, SOCK_DONE))
650 return NULL;
651
652 if ((flags & MSG_DONTWAIT) || !timeo) {
653 *err = -EAGAIN;
654 return NULL;
655 }
656
657 add_wait_queue(sk_sleep(sk), &wait);
658 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
659 sk_wait_event(sk, &timeo, ctx->recv_pkt != skb, &wait);
660 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
661 remove_wait_queue(sk_sleep(sk), &wait);
662
663 /* Handle signals */
664 if (signal_pending(current)) {
665 *err = sock_intr_errno(timeo);
666 return NULL;
667 }
668 }
669
670 return skb;
671}
672
673static int decrypt_skb(struct sock *sk, struct sk_buff *skb,
674 struct scatterlist *sgout)
675{
676 struct tls_context *tls_ctx = tls_get_ctx(sk);
677 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
678 char iv[TLS_CIPHER_AES_GCM_128_SALT_SIZE + MAX_IV_SIZE];
679 struct scatterlist sgin_arr[MAX_SKB_FRAGS + 2];
680 struct scatterlist *sgin = &sgin_arr[0];
681 struct strp_msg *rxm = strp_msg(skb);
682 int ret, nsg = ARRAY_SIZE(sgin_arr);
683 struct sk_buff *unused;
684
685 ret = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
686 iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
687 tls_ctx->rx.iv_size);
688 if (ret < 0)
689 return ret;
690
691 memcpy(iv, tls_ctx->rx.iv, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
692 if (!sgout) {
693 nsg = skb_cow_data(skb, 0, &unused) + 1;
694 sgin = kmalloc_array(nsg, sizeof(*sgin), sk->sk_allocation);
695 if (!sgout)
696 sgout = sgin;
697 }
698
699 sg_init_table(sgin, nsg);
700 sg_set_buf(&sgin[0], ctx->rx_aad_ciphertext, TLS_AAD_SPACE_SIZE);
701
702 nsg = skb_to_sgvec(skb, &sgin[1],
703 rxm->offset + tls_ctx->rx.prepend_size,
704 rxm->full_len - tls_ctx->rx.prepend_size);
705
706 tls_make_aad(ctx->rx_aad_ciphertext,
707 rxm->full_len - tls_ctx->rx.overhead_size,
708 tls_ctx->rx.rec_seq,
709 tls_ctx->rx.rec_seq_size,
710 ctx->control);
711
712 ret = tls_do_decryption(sk, sgin, sgout, iv,
713 rxm->full_len - tls_ctx->rx.overhead_size,
714 skb, sk->sk_allocation);
715
716 if (sgin != &sgin_arr[0])
717 kfree(sgin);
718
719 return ret;
720}
721
722static bool tls_sw_advance_skb(struct sock *sk, struct sk_buff *skb,
723 unsigned int len)
724{
725 struct tls_context *tls_ctx = tls_get_ctx(sk);
726 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
727 struct strp_msg *rxm = strp_msg(skb);
728
729 if (len < rxm->full_len) {
730 rxm->offset += len;
731 rxm->full_len -= len;
732
733 return false;
734 }
735
736 /* Finished with message */
737 ctx->recv_pkt = NULL;
738 kfree_skb(skb);
739 strp_unpause(&ctx->strp);
740
741 return true;
742}
743
744int tls_sw_recvmsg(struct sock *sk,
745 struct msghdr *msg,
746 size_t len,
747 int nonblock,
748 int flags,
749 int *addr_len)
750{
751 struct tls_context *tls_ctx = tls_get_ctx(sk);
752 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
753 unsigned char control;
754 struct strp_msg *rxm;
755 struct sk_buff *skb;
756 ssize_t copied = 0;
757 bool cmsg = false;
758 int err = 0;
759 long timeo;
760
761 flags |= nonblock;
762
763 if (unlikely(flags & MSG_ERRQUEUE))
764 return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR);
765
766 lock_sock(sk);
767
768 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
769 do {
770 bool zc = false;
771 int chunk = 0;
772
773 skb = tls_wait_data(sk, flags, timeo, &err);
774 if (!skb)
775 goto recv_end;
776
777 rxm = strp_msg(skb);
778 if (!cmsg) {
779 int cerr;
780
781 cerr = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE,
782 sizeof(ctx->control), &ctx->control);
783 cmsg = true;
784 control = ctx->control;
785 if (ctx->control != TLS_RECORD_TYPE_DATA) {
786 if (cerr || msg->msg_flags & MSG_CTRUNC) {
787 err = -EIO;
788 goto recv_end;
789 }
790 }
791 } else if (control != ctx->control) {
792 goto recv_end;
793 }
794
795 if (!ctx->decrypted) {
796 int page_count;
797 int to_copy;
798
799 page_count = iov_iter_npages(&msg->msg_iter,
800 MAX_SKB_FRAGS);
801 to_copy = rxm->full_len - tls_ctx->rx.overhead_size;
802 if (to_copy <= len && page_count < MAX_SKB_FRAGS &&
803 likely(!(flags & MSG_PEEK))) {
804 struct scatterlist sgin[MAX_SKB_FRAGS + 1];
805 int pages = 0;
806
807 zc = true;
808 sg_init_table(sgin, MAX_SKB_FRAGS + 1);
809 sg_set_buf(&sgin[0], ctx->rx_aad_plaintext,
810 TLS_AAD_SPACE_SIZE);
811
812 err = zerocopy_from_iter(sk, &msg->msg_iter,
813 to_copy, &pages,
814 &chunk, &sgin[1],
815 MAX_SKB_FRAGS, false);
816 if (err < 0)
817 goto fallback_to_reg_recv;
818
819 err = decrypt_skb(sk, skb, sgin);
820 for (; pages > 0; pages--)
821 put_page(sg_page(&sgin[pages]));
822 if (err < 0) {
823 tls_err_abort(sk, EBADMSG);
824 goto recv_end;
825 }
826 } else {
827fallback_to_reg_recv:
828 err = decrypt_skb(sk, skb, NULL);
829 if (err < 0) {
830 tls_err_abort(sk, EBADMSG);
831 goto recv_end;
832 }
833 }
834 ctx->decrypted = true;
835 }
836
837 if (!zc) {
838 chunk = min_t(unsigned int, rxm->full_len, len);
839 err = skb_copy_datagram_msg(skb, rxm->offset, msg,
840 chunk);
841 if (err < 0)
842 goto recv_end;
843 }
844
845 copied += chunk;
846 len -= chunk;
847 if (likely(!(flags & MSG_PEEK))) {
848 u8 control = ctx->control;
849
850 if (tls_sw_advance_skb(sk, skb, chunk)) {
851 /* Return full control message to
852 * userspace before trying to parse
853 * another message type
854 */
855 msg->msg_flags |= MSG_EOR;
856 if (control != TLS_RECORD_TYPE_DATA)
857 goto recv_end;
858 }
859 }
860 } while (len);
861
862recv_end:
863 release_sock(sk);
864 return copied ? : err;
865}
866
867ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
868 struct pipe_inode_info *pipe,
869 size_t len, unsigned int flags)
870{
871 struct tls_context *tls_ctx = tls_get_ctx(sock->sk);
872 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
873 struct strp_msg *rxm = NULL;
874 struct sock *sk = sock->sk;
875 struct sk_buff *skb;
876 ssize_t copied = 0;
877 int err = 0;
878 long timeo;
879 int chunk;
880
881 lock_sock(sk);
882
883 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
884
885 skb = tls_wait_data(sk, flags, timeo, &err);
886 if (!skb)
887 goto splice_read_end;
888
889 /* splice does not support reading control messages */
890 if (ctx->control != TLS_RECORD_TYPE_DATA) {
891 err = -ENOTSUPP;
892 goto splice_read_end;
893 }
894
895 if (!ctx->decrypted) {
896 err = decrypt_skb(sk, skb, NULL);
897
898 if (err < 0) {
899 tls_err_abort(sk, EBADMSG);
900 goto splice_read_end;
901 }
902 ctx->decrypted = true;
903 }
904 rxm = strp_msg(skb);
905
906 chunk = min_t(unsigned int, rxm->full_len, len);
907 copied = skb_splice_bits(skb, sk, rxm->offset, pipe, chunk, flags);
908 if (copied < 0)
909 goto splice_read_end;
910
911 if (likely(!(flags & MSG_PEEK)))
912 tls_sw_advance_skb(sk, skb, copied);
913
914splice_read_end:
915 release_sock(sk);
916 return copied ? : err;
917}
918
919unsigned int tls_sw_poll(struct file *file, struct socket *sock,
920 struct poll_table_struct *wait)
921{
922 unsigned int ret;
923 struct sock *sk = sock->sk;
924 struct tls_context *tls_ctx = tls_get_ctx(sk);
925 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
926
927 /* Grab POLLOUT and POLLHUP from the underlying socket */
928 ret = ctx->sk_poll(file, sock, wait);
929
930 /* Clear POLLIN bits, and set based on recv_pkt */
931 ret &= ~(POLLIN | POLLRDNORM);
932 if (ctx->recv_pkt)
933 ret |= POLLIN | POLLRDNORM;
934
935 return ret;
936}
937
938static int tls_read_size(struct strparser *strp, struct sk_buff *skb)
939{
940 struct tls_context *tls_ctx = tls_get_ctx(strp->sk);
941 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
942 char header[tls_ctx->rx.prepend_size];
943 struct strp_msg *rxm = strp_msg(skb);
944 size_t cipher_overhead;
945 size_t data_len = 0;
946 int ret;
947
948 /* Verify that we have a full TLS header, or wait for more data */
949 if (rxm->offset + tls_ctx->rx.prepend_size > skb->len)
950 return 0;
951
952 /* Linearize header to local buffer */
953 ret = skb_copy_bits(skb, rxm->offset, header, tls_ctx->rx.prepend_size);
954
955 if (ret < 0)
956 goto read_failure;
957
958 ctx->control = header[0];
959
960 data_len = ((header[4] & 0xFF) | (header[3] << 8));
961
962 cipher_overhead = tls_ctx->rx.tag_size + tls_ctx->rx.iv_size;
963
964 if (data_len > TLS_MAX_PAYLOAD_SIZE + cipher_overhead) {
965 ret = -EMSGSIZE;
966 goto read_failure;
967 }
968 if (data_len < cipher_overhead) {
969 ret = -EBADMSG;
970 goto read_failure;
971 }
972
973 if (header[1] != TLS_VERSION_MINOR(tls_ctx->crypto_recv.version) ||
974 header[2] != TLS_VERSION_MAJOR(tls_ctx->crypto_recv.version)) {
975 ret = -EINVAL;
976 goto read_failure;
977 }
978
979 return data_len + TLS_HEADER_SIZE;
980
981read_failure:
982 tls_err_abort(strp->sk, ret);
983
984 return ret;
985}
986
987static void tls_queue(struct strparser *strp, struct sk_buff *skb)
988{
989 struct tls_context *tls_ctx = tls_get_ctx(strp->sk);
990 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
991 struct strp_msg *rxm;
992
993 rxm = strp_msg(skb);
994
995 ctx->decrypted = false;
996
997 ctx->recv_pkt = skb;
998 strp_pause(strp);
999
1000 strp->sk->sk_state_change(strp->sk);
1001}
1002
1003static void tls_data_ready(struct sock *sk)
1004{
1005 struct tls_context *tls_ctx = tls_get_ctx(sk);
1006 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
1007
1008 strp_data_ready(&ctx->strp);
1009}
1010
1011void tls_sw_free_resources(struct sock *sk)
1012{
1013 struct tls_context *tls_ctx = tls_get_ctx(sk);
1014 struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
1015
1016 if (ctx->aead_send)
1017 crypto_free_aead(ctx->aead_send);
1018 if (ctx->aead_recv) {
1019 if (ctx->recv_pkt) {
1020 kfree_skb(ctx->recv_pkt);
1021 ctx->recv_pkt = NULL;
1022 }
1023 crypto_free_aead(ctx->aead_recv);
1024 strp_stop(&ctx->strp);
1025 write_lock_bh(&sk->sk_callback_lock);
1026 sk->sk_data_ready = ctx->saved_data_ready;
1027 write_unlock_bh(&sk->sk_callback_lock);
1028 release_sock(sk);
1029 strp_done(&ctx->strp);
1030 lock_sock(sk);
1031 }
1032
1033 tls_free_both_sg(sk);
1034
1035 kfree(ctx);
1036 kfree(tls_ctx);
1037}
1038
1039int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
1040{
1041 char keyval[TLS_CIPHER_AES_GCM_128_KEY_SIZE];
1042 struct tls_crypto_info *crypto_info;
1043 struct tls12_crypto_info_aes_gcm_128 *gcm_128_info;
1044 struct tls_sw_context *sw_ctx;
1045 struct cipher_context *cctx;
1046 struct crypto_aead **aead;
1047 struct strp_callbacks cb;
1048 u16 nonce_size, tag_size, iv_size, rec_seq_size;
1049 char *iv, *rec_seq;
1050 int rc = 0;
1051
1052 if (!ctx) {
1053 rc = -EINVAL;
1054 goto out;
1055 }
1056
1057 if (!ctx->priv_ctx) {
1058 sw_ctx = kzalloc(sizeof(*sw_ctx), GFP_KERNEL);
1059 if (!sw_ctx) {
1060 rc = -ENOMEM;
1061 goto out;
1062 }
1063 crypto_init_wait(&sw_ctx->async_wait);
1064 } else {
1065 sw_ctx = ctx->priv_ctx;
1066 }
1067
1068 ctx->priv_ctx = (struct tls_offload_context *)sw_ctx;
1069
1070 if (tx) {
1071 crypto_info = &ctx->crypto_send;
1072 cctx = &ctx->tx;
1073 aead = &sw_ctx->aead_send;
1074 } else {
1075 crypto_info = &ctx->crypto_recv;
1076 cctx = &ctx->rx;
1077 aead = &sw_ctx->aead_recv;
1078 }
1079
1080 switch (crypto_info->cipher_type) {
1081 case TLS_CIPHER_AES_GCM_128: {
1082 nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
1083 tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE;
1084 iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
1085 iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv;
1086 rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE;
1087 rec_seq =
1088 ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq;
1089 gcm_128_info =
1090 (struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
1091 break;
1092 }
1093 default:
1094 rc = -EINVAL;
1095 goto free_priv;
1096 }
1097
1098 /* Sanity-check the IV size for stack allocations. */
1099 if (iv_size > MAX_IV_SIZE) {
1100 rc = -EINVAL;
1101 goto free_priv;
1102 }
1103
1104 cctx->prepend_size = TLS_HEADER_SIZE + nonce_size;
1105 cctx->tag_size = tag_size;
1106 cctx->overhead_size = cctx->prepend_size + cctx->tag_size;
1107 cctx->iv_size = iv_size;
1108 cctx->iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
1109 GFP_KERNEL);
1110 if (!cctx->iv) {
1111 rc = -ENOMEM;
1112 goto free_priv;
1113 }
1114 memcpy(cctx->iv, gcm_128_info->salt, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
1115 memcpy(cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size);
1116 cctx->rec_seq_size = rec_seq_size;
1117 cctx->rec_seq = kmalloc(rec_seq_size, GFP_KERNEL);
1118 if (!cctx->rec_seq) {
1119 rc = -ENOMEM;
1120 goto free_iv;
1121 }
1122 memcpy(cctx->rec_seq, rec_seq, rec_seq_size);
1123
1124 if (tx) {
1125 sg_init_table(sw_ctx->sg_encrypted_data,
1126 ARRAY_SIZE(sw_ctx->sg_encrypted_data));
1127 sg_init_table(sw_ctx->sg_plaintext_data,
1128 ARRAY_SIZE(sw_ctx->sg_plaintext_data));
1129
1130 sg_init_table(sw_ctx->sg_aead_in, 2);
1131 sg_set_buf(&sw_ctx->sg_aead_in[0], sw_ctx->aad_space,
1132 sizeof(sw_ctx->aad_space));
1133 sg_unmark_end(&sw_ctx->sg_aead_in[1]);
1134 sg_chain(sw_ctx->sg_aead_in, 2, sw_ctx->sg_plaintext_data);
1135 sg_init_table(sw_ctx->sg_aead_out, 2);
1136 sg_set_buf(&sw_ctx->sg_aead_out[0], sw_ctx->aad_space,
1137 sizeof(sw_ctx->aad_space));
1138 sg_unmark_end(&sw_ctx->sg_aead_out[1]);
1139 sg_chain(sw_ctx->sg_aead_out, 2, sw_ctx->sg_encrypted_data);
1140 }
1141
1142 if (!*aead) {
1143 *aead = crypto_alloc_aead("gcm(aes)", 0, 0);
1144 if (IS_ERR(*aead)) {
1145 rc = PTR_ERR(*aead);
1146 *aead = NULL;
1147 goto free_rec_seq;
1148 }
1149 }
1150
1151 ctx->push_pending_record = tls_sw_push_pending_record;
1152
1153 memcpy(keyval, gcm_128_info->key, TLS_CIPHER_AES_GCM_128_KEY_SIZE);
1154
1155 rc = crypto_aead_setkey(*aead, keyval,
1156 TLS_CIPHER_AES_GCM_128_KEY_SIZE);
1157 if (rc)
1158 goto free_aead;
1159
1160 rc = crypto_aead_setauthsize(*aead, cctx->tag_size);
1161 if (rc)
1162 goto free_aead;
1163
1164 if (!tx) {
1165 /* Set up strparser */
1166 memset(&cb, 0, sizeof(cb));
1167 cb.rcv_msg = tls_queue;
1168 cb.parse_msg = tls_read_size;
1169
1170 strp_init(&sw_ctx->strp, sk, &cb);
1171
1172 write_lock_bh(&sk->sk_callback_lock);
1173 sw_ctx->saved_data_ready = sk->sk_data_ready;
1174 sk->sk_data_ready = tls_data_ready;
1175 write_unlock_bh(&sk->sk_callback_lock);
1176
1177 sw_ctx->sk_poll = sk->sk_socket->ops->poll;
1178
1179 strp_check_rcv(&sw_ctx->strp);
1180 }
1181
1182 goto out;
1183
1184free_aead:
1185 crypto_free_aead(*aead);
1186 *aead = NULL;
1187free_rec_seq:
1188 kfree(cctx->rec_seq);
1189 cctx->rec_seq = NULL;
1190free_iv:
1191 kfree(ctx->tx.iv);
1192 ctx->tx.iv = NULL;
1193free_priv:
1194 kfree(ctx->priv_ctx);
1195 ctx->priv_ctx = NULL;
1196out:
1197 return rc;
1198}