aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/net/tls/tls_main.c
blob: 6bc2879ba637bf4c4c2d7338fd217810b2bb8485 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
/*
 * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
 * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/module.h>

#include <net/tcp.h>
#include <net/inet_common.h>
#include <linux/highmem.h>
#include <linux/netdevice.h>
#include <linux/sched/signal.h>
#include <linux/inetdevice.h>
#include <linux/inet_diag.h>

#include <net/snmp.h>
#include <net/tls.h>
#include <net/tls_toe.h>

MODULE_AUTHOR("Mellanox Technologies");
MODULE_DESCRIPTION("Transport Layer Security Support");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS_TCP_ULP("tls");

enum {
	TLSV4,
	TLSV6,
	TLS_NUM_PROTS,
};

static const struct proto *saved_tcpv6_prot;
static DEFINE_MUTEX(tcpv6_prot_mutex);
static const struct proto *saved_tcpv4_prot;
static DEFINE_MUTEX(tcpv4_prot_mutex);
static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
static struct proto_ops tls_proto_ops[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
			 const struct proto *base);

void update_sk_prot(struct sock *sk, struct tls_context *ctx)
{
	int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;

	WRITE_ONCE(sk->sk_prot,
		   &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]);
	WRITE_ONCE(sk->sk_socket->ops,
		   &tls_proto_ops[ip_ver][ctx->tx_conf][ctx->rx_conf]);
}

int wait_on_pending_writer(struct sock *sk, long *timeo)
{
	int rc = 0;
	DEFINE_WAIT_FUNC(wait, woken_wake_function);

	add_wait_queue(sk_sleep(sk), &wait);
	while (1) {
		if (!*timeo) {
			rc = -EAGAIN;
			break;
		}

		if (signal_pending(current)) {
			rc = sock_intr_errno(*timeo);
			break;
		}

		if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
			break;
	}
	remove_wait_queue(sk_sleep(sk), &wait);
	return rc;
}

int tls_push_sg(struct sock *sk,
		struct tls_context *ctx,
		struct scatterlist *sg,
		u16 first_offset,
		int flags)
{
	int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
	int ret = 0;
	struct page *p;
	size_t size;
	int offset = first_offset;

	size = sg->length - offset;
	offset += sg->offset;

	ctx->in_tcp_sendpages = true;
	while (1) {
		if (sg_is_last(sg))
			sendpage_flags = flags;

		/* is sending application-limited? */
		tcp_rate_check_app_limited(sk);
		p = sg_page(sg);
retry:
		ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);

		if (ret != size) {
			if (ret > 0) {
				offset += ret;
				size -= ret;
				goto retry;
			}

			offset -= sg->offset;
			ctx->partially_sent_offset = offset;
			ctx->partially_sent_record = (void *)sg;
			ctx->in_tcp_sendpages = false;
			return ret;
		}

		put_page(p);
		sk_mem_uncharge(sk, sg->length);
		sg = sg_next(sg);
		if (!sg)
			break;

		offset = sg->offset;
		size = sg->length;
	}

	ctx->in_tcp_sendpages = false;

	return 0;
}

static int tls_handle_open_record(struct sock *sk, int flags)
{
	struct tls_context *ctx = tls_get_ctx(sk);

	if (tls_is_pending_open_record(ctx))
		return ctx->push_pending_record(sk, flags);

	return 0;
}

int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
		      unsigned char *record_type)
{
	struct cmsghdr *cmsg;
	int rc = -EINVAL;

	for_each_cmsghdr(cmsg, msg) {
		if (!CMSG_OK(msg, cmsg))
			return -EINVAL;
		if (cmsg->cmsg_level != SOL_TLS)
			continue;

		switch (cmsg->cmsg_type) {
		case TLS_SET_RECORD_TYPE:
			if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
				return -EINVAL;

			if (msg->msg_flags & MSG_MORE)
				return -EINVAL;

			rc = tls_handle_open_record(sk, msg->msg_flags);
			if (rc)
				return rc;

			*record_type = *(unsigned char *)CMSG_DATA(cmsg);
			rc = 0;
			break;
		default:
			return -EINVAL;
		}
	}

	return rc;
}

int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
			    int flags)
{
	struct scatterlist *sg;
	u16 offset;

	sg = ctx->partially_sent_record;
	offset = ctx->partially_sent_offset;

	ctx->partially_sent_record = NULL;
	return tls_push_sg(sk, ctx, sg, offset, flags);
}

void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
{
	struct scatterlist *sg;

	for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
		put_page(sg_page(sg));
		sk_mem_uncharge(sk, sg->length);
	}
	ctx->partially_sent_record = NULL;
}

static void tls_write_space(struct sock *sk)
{
	struct tls_context *ctx = tls_get_ctx(sk);

	/* If in_tcp_sendpages call lower protocol write space handler
	 * to ensure we wake up any waiting operations there. For example
	 * if do_tcp_sendpages where to call sk_wait_event.
	 */
	if (ctx->in_tcp_sendpages) {
		ctx->sk_write_space(sk);
		return;
	}

#ifdef CONFIG_TLS_DEVICE
	if (ctx->tx_conf == TLS_HW)
		tls_device_write_space(sk, ctx);
	else
#endif
		tls_sw_write_space(sk, ctx);

	ctx->sk_write_space(sk);
}

/**
 * tls_ctx_free() - free TLS ULP context
 * @sk:  socket to with @ctx is attached
 * @ctx: TLS context structure
 *
 * Free TLS context. If @sk is %NULL caller guarantees that the socket
 * to which @ctx was attached has no outstanding references.
 */
void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
{
	if (!ctx)
		return;

	memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
	memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
	mutex_destroy(&ctx->tx_lock);

	if (sk)
		kfree_rcu(ctx, rcu);
	else
		kfree(ctx);
}

static void tls_sk_proto_cleanup(struct sock *sk,
				 struct tls_context *ctx, long timeo)
{
	if (unlikely(sk->sk_write_pending) &&
	    !wait_on_pending_writer(sk, &timeo))
		tls_handle_open_record(sk, 0);

	/* We need these for tls_sw_fallback handling of other packets */
	if (ctx->tx_conf == TLS_SW) {
		kfree(ctx->tx.rec_seq);
		kfree(ctx->tx.iv);
		tls_sw_release_resources_tx(sk);
		TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
	} else if (ctx->tx_conf == TLS_HW) {
		tls_device_free_resources_tx(sk);
		TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
	}

	if (ctx->rx_conf == TLS_SW) {
		tls_sw_release_resources_rx(sk);
		TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
	} else if (ctx->rx_conf == TLS_HW) {
		tls_device_offload_cleanup_rx(sk);
		TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
	}
}

static void tls_sk_proto_close(struct sock *sk, long timeout)
{
	struct inet_connection_sock *icsk = inet_csk(sk);
	struct tls_context *ctx = tls_get_ctx(sk);
	long timeo = sock_sndtimeo(sk, 0);
	bool free_ctx;

	if (ctx->tx_conf == TLS_SW)
		tls_sw_cancel_work_tx(ctx);

	lock_sock(sk);
	free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;

	if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
		tls_sk_proto_cleanup(sk, ctx, timeo);

	write_lock_bh(&sk->sk_callback_lock);
	if (free_ctx)
		rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
	WRITE_ONCE(sk->sk_prot, ctx->sk_proto);
	if (sk->sk_write_space == tls_write_space)
		sk->sk_write_space = ctx->sk_write_space;
	write_unlock_bh(&sk->sk_callback_lock);
	release_sock(sk);
	if (ctx->tx_conf == TLS_SW)
		tls_sw_free_ctx_tx(ctx);
	if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
		tls_sw_strparser_done(ctx);
	if (ctx->rx_conf == TLS_SW)
		tls_sw_free_ctx_rx(ctx);
	ctx->sk_proto->close(sk, timeout);

	if (free_ctx)
		tls_ctx_free(sk, ctx);
}

static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
				  int __user *optlen, int tx)
{
	int rc = 0;
	struct tls_context *ctx = tls_get_ctx(sk);
	struct tls_crypto_info *crypto_info;
	struct cipher_context *cctx;
	int len;

	if (get_user(len, optlen))
		return -EFAULT;

	if (!optval || (len < sizeof(*crypto_info))) {
		rc = -EINVAL;
		goto out;
	}

	if (!ctx) {
		rc = -EBUSY;
		goto out;
	}

	/* get user crypto info */
	if (tx) {
		crypto_info = &ctx->crypto_send.info;
		cctx = &ctx->tx;
	} else {
		crypto_info = &ctx->crypto_recv.info;
		cctx = &ctx->rx;
	}

	if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
		rc = -EBUSY;
		goto out;
	}

	if (len == sizeof(*crypto_info)) {
		if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
			rc = -EFAULT;
		goto out;
	}

	switch (crypto_info->cipher_type) {
	case TLS_CIPHER_AES_GCM_128: {
		struct tls12_crypto_info_aes_gcm_128 *
		  crypto_info_aes_gcm_128 =
		  container_of(crypto_info,
			       struct tls12_crypto_info_aes_gcm_128,
			       info);

		if (len != sizeof(*crypto_info_aes_gcm_128)) {
			rc = -EINVAL;
			goto out;
		}
		lock_sock(sk);
		memcpy(crypto_info_aes_gcm_128->iv,
		       cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
		       TLS_CIPHER_AES_GCM_128_IV_SIZE);
		memcpy(crypto_info_aes_gcm_128->rec_seq, cctx->rec_seq,
		       TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
		release_sock(sk);
		if (copy_to_user(optval,
				 crypto_info_aes_gcm_128,
				 sizeof(*crypto_info_aes_gcm_128)))
			rc = -EFAULT;
		break;
	}
	case TLS_CIPHER_AES_GCM_256: {
		struct tls12_crypto_info_aes_gcm_256 *
		  crypto_info_aes_gcm_256 =
		  container_of(crypto_info,
			       struct tls12_crypto_info_aes_gcm_256,
			       info);

		if (len != sizeof(*crypto_info_aes_gcm_256)) {
			rc = -EINVAL;
			goto out;
		}
		lock_sock(sk);
		memcpy(crypto_info_aes_gcm_256->iv,
		       cctx->iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
		       TLS_CIPHER_AES_GCM_256_IV_SIZE);
		memcpy(crypto_info_aes_gcm_256->rec_seq, cctx->rec_seq,
		       TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
		release_sock(sk);
		if (copy_to_user(optval,
				 crypto_info_aes_gcm_256,
				 sizeof(*crypto_info_aes_gcm_256)))
			rc = -EFAULT;
		break;
	}
	case TLS_CIPHER_AES_CCM_128: {
		struct tls12_crypto_info_aes_ccm_128 *aes_ccm_128 =
			container_of(crypto_info,
				struct tls12_crypto_info_aes_ccm_128, info);

		if (len != sizeof(*aes_ccm_128)) {
			rc = -EINVAL;
			goto out;
		}
		lock_sock(sk);
		memcpy(aes_ccm_128->iv,
		       cctx->iv + TLS_CIPHER_AES_CCM_128_SALT_SIZE,
		       TLS_CIPHER_AES_CCM_128_IV_SIZE);
		memcpy(aes_ccm_128->rec_seq, cctx->rec_seq,
		       TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE);
		release_sock(sk);
		if (copy_to_user(optval, aes_ccm_128, sizeof(*aes_ccm_128)))
			rc = -EFAULT;
		break;
	}
	case TLS_CIPHER_CHACHA20_POLY1305: {
		struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305 =
			container_of(crypto_info,
				struct tls12_crypto_info_chacha20_poly1305,
				info);

		if (len != sizeof(*chacha20_poly1305)) {
			rc = -EINVAL;
			goto out;
		}
		lock_sock(sk);
		memcpy(chacha20_poly1305->iv,
		       cctx->iv + TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE,
		       TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);
		memcpy(chacha20_poly1305->rec_seq, cctx->rec_seq,
		       TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE);
		release_sock(sk);
		if (copy_to_user(optval, chacha20_poly1305,
				sizeof(*chacha20_poly1305)))
			rc = -EFAULT;
		break;
	}
	case TLS_CIPHER_SM4_GCM: {
		struct tls12_crypto_info_sm4_gcm *sm4_gcm_info =
			container_of(crypto_info,
				struct tls12_crypto_info_sm4_gcm, info);

		if (len != sizeof(*sm4_gcm_info)) {
			rc = -EINVAL;
			goto out;
		}
		lock_sock(sk);
		memcpy(sm4_gcm_info->iv,
		       cctx->iv + TLS_CIPHER_SM4_GCM_SALT_SIZE,
		       TLS_CIPHER_SM4_GCM_IV_SIZE);
		memcpy(sm4_gcm_info->rec_seq, cctx->rec_seq,
		       TLS_CIPHER_SM4_GCM_REC_SEQ_SIZE);
		release_sock(sk);
		if (copy_to_user(optval, sm4_gcm_info, sizeof(*sm4_gcm_info)))
			rc = -EFAULT;
		break;
	}
	case TLS_CIPHER_SM4_CCM: {
		struct tls12_crypto_info_sm4_ccm *sm4_ccm_info =
			container_of(crypto_info,
				struct tls12_crypto_info_sm4_ccm, info);

		if (len != sizeof(*sm4_ccm_info)) {
			rc = -EINVAL;
			goto out;
		}
		lock_sock(sk);
		memcpy(sm4_ccm_info->iv,
		       cctx->iv + TLS_CIPHER_SM4_CCM_SALT_SIZE,
		       TLS_CIPHER_SM4_CCM_IV_SIZE);
		memcpy(sm4_ccm_info->rec_seq, cctx->rec_seq,
		       TLS_CIPHER_SM4_CCM_REC_SEQ_SIZE);
		release_sock(sk);
		if (copy_to_user(optval, sm4_ccm_info, sizeof(*sm4_ccm_info)))
			rc = -EFAULT;
		break;
	}
	default:
		rc = -EINVAL;
	}

out:
	return rc;
}

static int do_tls_getsockopt(struct sock *sk, int optname,
			     char __user *optval, int __user *optlen)
{
	int rc = 0;

	switch (optname) {
	case TLS_TX:
	case TLS_RX:
		rc = do_tls_getsockopt_conf(sk, optval, optlen,
					    optname == TLS_TX);
		break;
	default:
		rc = -ENOPROTOOPT;
		break;
	}
	return rc;
}

static int tls_getsockopt(struct sock *sk, int level, int optname,
			  char __user *optval, int __user *optlen)
{
	struct tls_context *ctx = tls_get_ctx(sk);

	if (level != SOL_TLS)
		return ctx->sk_proto->getsockopt(sk, level,
						 optname, optval, optlen);

	return do_tls_getsockopt(sk, optname, optval, optlen);
}

static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
				  unsigned int optlen, int tx)
{
	struct tls_crypto_info *crypto_info;
	struct tls_crypto_info *alt_crypto_info;
	struct tls_context *ctx = tls_get_ctx(sk);
	size_t optsize;
	int rc = 0;
	int conf;

	if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info))) {
		rc = -EINVAL;
		goto out;
	}

	if (tx) {
		crypto_info = &ctx->crypto_send.info;
		alt_crypto_info = &ctx->crypto_recv.info;
	} else {
		crypto_info = &ctx->crypto_recv.info;
		alt_crypto_info = &ctx->crypto_send.info;
	}

	/* Currently we don't support set crypto info more than one time */
	if (TLS_CRYPTO_INFO_READY(crypto_info)) {
		rc = -EBUSY;
		goto out;
	}

	rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
	if (rc) {
		rc = -EFAULT;
		goto err_crypto_info;
	}

	/* check version */
	if (crypto_info->version != TLS_1_2_VERSION &&
	    crypto_info->version != TLS_1_3_VERSION) {
		rc = -EINVAL;
		goto err_crypto_info;
	}

	/* Ensure that TLS version and ciphers are same in both directions */
	if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
		if (alt_crypto_info->version != crypto_info->version ||
		    alt_crypto_info->cipher_type != crypto_info->cipher_type) {
			rc = -EINVAL;
			goto err_crypto_info;
		}
	}

	switch (crypto_info->cipher_type) {
	case TLS_CIPHER_AES_GCM_128:
		optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
		break;
	case TLS_CIPHER_AES_GCM_256: {
		optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
		break;
	}
	case TLS_CIPHER_AES_CCM_128:
		optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
		break;
	case TLS_CIPHER_CHACHA20_POLY1305:
		optsize = sizeof(struct tls12_crypto_info_chacha20_poly1305);
		break;
	case TLS_CIPHER_SM4_GCM:
		optsize = sizeof(struct tls12_crypto_info_sm4_gcm);
		break;
	case TLS_CIPHER_SM4_CCM:
		optsize = sizeof(struct tls12_crypto_info_sm4_ccm);
		break;
	default:
		rc = -EINVAL;
		goto err_crypto_info;
	}

	if (optlen != optsize) {
		rc = -EINVAL;
		goto err_crypto_info;
	}

	rc = copy_from_sockptr_offset(crypto_info + 1, optval,
				      sizeof(*crypto_info),
				      optlen - sizeof(*crypto_info));
	if (rc) {
		rc = -EFAULT;
		goto err_crypto_info;
	}

	if (tx) {
		rc = tls_set_device_offload(sk, ctx);
		conf = TLS_HW;
		if (!rc) {
			TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
			TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
		} else {
			rc = tls_set_sw_offload(sk, ctx, 1);
			if (rc)
				goto err_crypto_info;
			TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
			TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
			conf = TLS_SW;
		}
	} else {
		rc = tls_set_device_offload_rx(sk, ctx);
		conf = TLS_HW;
		if (!rc) {
			TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
			TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
		} else {
			rc = tls_set_sw_offload(sk, ctx, 0);
			if (rc)
				goto err_crypto_info;
			TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
			TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
			conf = TLS_SW;
		}
		tls_sw_strparser_arm(sk, ctx);
	}

	if (tx)
		ctx->tx_conf = conf;
	else
		ctx->rx_conf = conf;
	update_sk_prot(sk, ctx);
	if (tx) {
		ctx->sk_write_space = sk->sk_write_space;
		sk->sk_write_space = tls_write_space;
	}
	goto out;

err_crypto_info:
	memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
out:
	return rc;
}

static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
			     unsigned int optlen)
{
	int rc = 0;

	switch (optname) {
	case TLS_TX:
	case TLS_RX:
		lock_sock(sk);
		rc = do_tls_setsockopt_conf(sk, optval, optlen,
					    optname == TLS_TX);
		release_sock(sk);
		break;
	default:
		rc = -ENOPROTOOPT;
		break;
	}
	return rc;
}

static int tls_setsockopt(struct sock *sk, int level, int optname,
			  sockptr_t optval, unsigned int optlen)
{
	struct tls_context *ctx = tls_get_ctx(sk);

	if (level != SOL_TLS)
		return ctx->sk_proto->setsockopt(sk, level, optname, optval,
						 optlen);

	return do_tls_setsockopt(sk, optname, optval, optlen);
}

struct tls_context *tls_ctx_create(struct sock *sk)
{
	struct inet_connection_sock *icsk = inet_csk(sk);
	struct tls_context *ctx;

	ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
	if (!ctx)
		return NULL;

	mutex_init(&ctx->tx_lock);
	rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
	ctx->sk_proto = READ_ONCE(sk->sk_prot);
	ctx->sk = sk;
	return ctx;
}

static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
			    const struct proto_ops *base)
{
	ops[TLS_BASE][TLS_BASE] = *base;

	ops[TLS_SW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
	ops[TLS_SW  ][TLS_BASE].sendpage_locked	= tls_sw_sendpage_locked;

	ops[TLS_BASE][TLS_SW  ] = ops[TLS_BASE][TLS_BASE];
	ops[TLS_BASE][TLS_SW  ].splice_read	= tls_sw_splice_read;

	ops[TLS_SW  ][TLS_SW  ] = ops[TLS_SW  ][TLS_BASE];
	ops[TLS_SW  ][TLS_SW  ].splice_read	= tls_sw_splice_read;

#ifdef CONFIG_TLS_DEVICE
	ops[TLS_HW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
	ops[TLS_HW  ][TLS_BASE].sendpage_locked	= NULL;

	ops[TLS_HW  ][TLS_SW  ] = ops[TLS_BASE][TLS_SW  ];
	ops[TLS_HW  ][TLS_SW  ].sendpage_locked	= NULL;

	ops[TLS_BASE][TLS_HW  ] = ops[TLS_BASE][TLS_SW  ];

	ops[TLS_SW  ][TLS_HW  ] = ops[TLS_SW  ][TLS_SW  ];

	ops[TLS_HW  ][TLS_HW  ] = ops[TLS_HW  ][TLS_SW  ];
	ops[TLS_HW  ][TLS_HW  ].sendpage_locked	= NULL;
#endif
#ifdef CONFIG_TLS_TOE
	ops[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
#endif
}

static void tls_build_proto(struct sock *sk)
{
	int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
	struct proto *prot = READ_ONCE(sk->sk_prot);

	/* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
	if (ip_ver == TLSV6 &&
	    unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
		mutex_lock(&tcpv6_prot_mutex);
		if (likely(prot != saved_tcpv6_prot)) {
			build_protos(tls_prots[TLSV6], prot);
			build_proto_ops(tls_proto_ops[TLSV6],
					sk->sk_socket->ops);
			smp_store_release(&saved_tcpv6_prot, prot);
		}
		mutex_unlock(&tcpv6_prot_mutex);
	}

	if (ip_ver == TLSV4 &&
	    unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
		mutex_lock(&tcpv4_prot_mutex);
		if (likely(prot != saved_tcpv4_prot)) {
			build_protos(tls_prots[TLSV4], prot);
			build_proto_ops(tls_proto_ops[TLSV4],
					sk->sk_socket->ops);
			smp_store_release(&saved_tcpv4_prot, prot);
		}
		mutex_unlock(&tcpv4_prot_mutex);
	}
}

static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
			 const struct proto *base)
{
	prot[TLS_BASE][TLS_BASE] = *base;
	prot[TLS_BASE][TLS_BASE].setsockopt	= tls_setsockopt;
	prot[TLS_BASE][TLS_BASE].getsockopt	= tls_getsockopt;
	prot[TLS_BASE][TLS_BASE].close		= tls_sk_proto_close;

	prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
	prot[TLS_SW][TLS_BASE].sendmsg		= tls_sw_sendmsg;
	prot[TLS_SW][TLS_BASE].sendpage		= tls_sw_sendpage;

	prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
	prot[TLS_BASE][TLS_SW].recvmsg		  = tls_sw_recvmsg;
	prot[TLS_BASE][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
	prot[TLS_BASE][TLS_SW].close		  = tls_sk_proto_close;

	prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
	prot[TLS_SW][TLS_SW].recvmsg		= tls_sw_recvmsg;
	prot[TLS_SW][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
	prot[TLS_SW][TLS_SW].close		= tls_sk_proto_close;

#ifdef CONFIG_TLS_DEVICE
	prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
	prot[TLS_HW][TLS_BASE].sendmsg		= tls_device_sendmsg;
	prot[TLS_HW][TLS_BASE].sendpage		= tls_device_sendpage;

	prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
	prot[TLS_HW][TLS_SW].sendmsg		= tls_device_sendmsg;
	prot[TLS_HW][TLS_SW].sendpage		= tls_device_sendpage;

	prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];

	prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];

	prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
#endif
#ifdef CONFIG_TLS_TOE
	prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
	prot[TLS_HW_RECORD][TLS_HW_RECORD].hash		= tls_toe_hash;
	prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash	= tls_toe_unhash;
#endif
}

static int tls_init(struct sock *sk)
{
	struct tls_context *ctx;
	int rc = 0;

	tls_build_proto(sk);

#ifdef CONFIG_TLS_TOE
	if (tls_toe_bypass(sk))
		return 0;
#endif

	/* The TLS ulp is currently supported only for TCP sockets
	 * in ESTABLISHED state.
	 * Supporting sockets in LISTEN state will require us
	 * to modify the accept implementation to clone rather then
	 * share the ulp context.
	 */
	if (sk->sk_state != TCP_ESTABLISHED)
		return -ENOTCONN;

	/* allocate tls context */
	write_lock_bh(&sk->sk_callback_lock);
	ctx = tls_ctx_create(sk);
	if (!ctx) {
		rc = -ENOMEM;
		goto out;
	}

	ctx->tx_conf = TLS_BASE;
	ctx->rx_conf = TLS_BASE;
	update_sk_prot(sk, ctx);
out:
	write_unlock_bh(&sk->sk_callback_lock);
	return rc;
}

static void tls_update(struct sock *sk, struct proto *p,
		       void (*write_space)(struct sock *sk))
{
	struct tls_context *ctx;

	ctx = tls_get_ctx(sk);
	if (likely(ctx)) {
		ctx->sk_write_space = write_space;
		ctx->sk_proto = p;
	} else {
		/* Pairs with lockless read in sk_clone_lock(). */
		WRITE_ONCE(sk->sk_prot, p);
		sk->sk_write_space = write_space;
	}
}

static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
{
	u16 version, cipher_type;
	struct tls_context *ctx;
	struct nlattr *start;
	int err;

	start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
	if (!start)
		return -EMSGSIZE;

	rcu_read_lock();
	ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
	if (!ctx) {
		err = 0;
		goto nla_failure;
	}
	version = ctx->prot_info.version;
	if (version) {
		err = nla_put_u16(skb, TLS_INFO_VERSION, version);
		if (err)
			goto nla_failure;
	}
	cipher_type = ctx->prot_info.cipher_type;
	if (cipher_type) {
		err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
		if (err)
			goto nla_failure;
	}
	err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
	if (err)
		goto nla_failure;

	err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
	if (err)
		goto nla_failure;

	rcu_read_unlock();
	nla_nest_end(skb, start);
	return 0;

nla_failure:
	rcu_read_unlock();
	nla_nest_cancel(skb, start);
	return err;
}

static size_t tls_get_info_size(const struct sock *sk)
{
	size_t size = 0;

	size += nla_total_size(0) +		/* INET_ULP_INFO_TLS */
		nla_total_size(sizeof(u16)) +	/* TLS_INFO_VERSION */
		nla_total_size(sizeof(u16)) +	/* TLS_INFO_CIPHER */
		nla_total_size(sizeof(u16)) +	/* TLS_INFO_RXCONF */
		nla_total_size(sizeof(u16)) +	/* TLS_INFO_TXCONF */
		0;

	return size;
}

static int __net_init tls_init_net(struct net *net)
{
	int err;

	net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
	if (!net->mib.tls_statistics)
		return -ENOMEM;

	err = tls_proc_init(net);
	if (err)
		goto err_free_stats;

	return 0;
err_free_stats:
	free_percpu(net->mib.tls_statistics);
	return err;
}

static void __net_exit tls_exit_net(struct net *net)
{
	tls_proc_fini(net);
	free_percpu(net->mib.tls_statistics);
}

static struct pernet_operations tls_proc_ops = {
	.init = tls_init_net,
	.exit = tls_exit_net,
};

static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
	.name			= "tls",
	.owner			= THIS_MODULE,
	.init			= tls_init,
	.update			= tls_update,
	.get_info		= tls_get_info,
	.get_info_size		= tls_get_info_size,
};

static int __init tls_register(void)
{
	int err;

	err = register_pernet_subsys(&tls_proc_ops);
	if (err)
		return err;

	tls_device_init();
	tcp_register_ulp(&tcp_tls_ulp_ops);

	return 0;
}

static void __exit tls_unregister(void)
{
	tcp_unregister_ulp(&tcp_tls_ulp_ops);
	tls_device_cleanup();
	unregister_pernet_subsys(&tls_proc_ops);
}

module_init(tls_register);
module_exit(tls_unregister);