tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include <linux/module.h>
35
36#include <net/tcp.h>
37#include <net/inet_common.h>
38#include <linux/highmem.h>
39#include <linux/netdevice.h>
40#include <linux/sched/signal.h>
41#include <linux/inetdevice.h>
42#include <linux/inet_diag.h>
43
44#include <net/snmp.h>
45#include <net/tls.h>
46#include <net/tls_toe.h>
47
48MODULE_AUTHOR("Mellanox Technologies");
49MODULE_DESCRIPTION("Transport Layer Security Support");
50MODULE_LICENSE("Dual BSD/GPL");
51MODULE_ALIAS_TCP_ULP("tls");
52
53enum {
54 TLSV4,
55 TLSV6,
56 TLS_NUM_PROTS,
57};
58
59static const struct proto *saved_tcpv6_prot;
60static DEFINE_MUTEX(tcpv6_prot_mutex);
61static const struct proto *saved_tcpv4_prot;
62static DEFINE_MUTEX(tcpv4_prot_mutex);
63static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
64static struct proto_ops tls_sw_proto_ops;
65static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
66 const struct proto *base);
67
68void update_sk_prot(struct sock *sk, struct tls_context *ctx)
69{
70 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
71
72 WRITE_ONCE(sk->sk_prot,
73 &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]);
74}
75
76int wait_on_pending_writer(struct sock *sk, long *timeo)
77{
78 int rc = 0;
79 DEFINE_WAIT_FUNC(wait, woken_wake_function);
80
81 add_wait_queue(sk_sleep(sk), &wait);
82 while (1) {
83 if (!*timeo) {
84 rc = -EAGAIN;
85 break;
86 }
87
88 if (signal_pending(current)) {
89 rc = sock_intr_errno(*timeo);
90 break;
91 }
92
93 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
94 break;
95 }
96 remove_wait_queue(sk_sleep(sk), &wait);
97 return rc;
98}
99
100int tls_push_sg(struct sock *sk,
101 struct tls_context *ctx,
102 struct scatterlist *sg,
103 u16 first_offset,
104 int flags)
105{
106 int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
107 int ret = 0;
108 struct page *p;
109 size_t size;
110 int offset = first_offset;
111
112 size = sg->length - offset;
113 offset += sg->offset;
114
115 ctx->in_tcp_sendpages = true;
116 while (1) {
117 if (sg_is_last(sg))
118 sendpage_flags = flags;
119
120 /* is sending application-limited? */
121 tcp_rate_check_app_limited(sk);
122 p = sg_page(sg);
123retry:
124 ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);
125
126 if (ret != size) {
127 if (ret > 0) {
128 offset += ret;
129 size -= ret;
130 goto retry;
131 }
132
133 offset -= sg->offset;
134 ctx->partially_sent_offset = offset;
135 ctx->partially_sent_record = (void *)sg;
136 ctx->in_tcp_sendpages = false;
137 return ret;
138 }
139
140 put_page(p);
141 sk_mem_uncharge(sk, sg->length);
142 sg = sg_next(sg);
143 if (!sg)
144 break;
145
146 offset = sg->offset;
147 size = sg->length;
148 }
149
150 ctx->in_tcp_sendpages = false;
151
152 return 0;
153}
154
155static int tls_handle_open_record(struct sock *sk, int flags)
156{
157 struct tls_context *ctx = tls_get_ctx(sk);
158
159 if (tls_is_pending_open_record(ctx))
160 return ctx->push_pending_record(sk, flags);
161
162 return 0;
163}
164
165int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
166 unsigned char *record_type)
167{
168 struct cmsghdr *cmsg;
169 int rc = -EINVAL;
170
171 for_each_cmsghdr(cmsg, msg) {
172 if (!CMSG_OK(msg, cmsg))
173 return -EINVAL;
174 if (cmsg->cmsg_level != SOL_TLS)
175 continue;
176
177 switch (cmsg->cmsg_type) {
178 case TLS_SET_RECORD_TYPE:
179 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
180 return -EINVAL;
181
182 if (msg->msg_flags & MSG_MORE)
183 return -EINVAL;
184
185 rc = tls_handle_open_record(sk, msg->msg_flags);
186 if (rc)
187 return rc;
188
189 *record_type = *(unsigned char *)CMSG_DATA(cmsg);
190 rc = 0;
191 break;
192 default:
193 return -EINVAL;
194 }
195 }
196
197 return rc;
198}
199
200int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
201 int flags)
202{
203 struct scatterlist *sg;
204 u16 offset;
205
206 sg = ctx->partially_sent_record;
207 offset = ctx->partially_sent_offset;
208
209 ctx->partially_sent_record = NULL;
210 return tls_push_sg(sk, ctx, sg, offset, flags);
211}
212
213void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
214{
215 struct scatterlist *sg;
216
217 for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
218 put_page(sg_page(sg));
219 sk_mem_uncharge(sk, sg->length);
220 }
221 ctx->partially_sent_record = NULL;
222}
223
224static void tls_write_space(struct sock *sk)
225{
226 struct tls_context *ctx = tls_get_ctx(sk);
227
228 /* If in_tcp_sendpages call lower protocol write space handler
229 * to ensure we wake up any waiting operations there. For example
230 * if do_tcp_sendpages where to call sk_wait_event.
231 */
232 if (ctx->in_tcp_sendpages) {
233 ctx->sk_write_space(sk);
234 return;
235 }
236
237#ifdef CONFIG_TLS_DEVICE
238 if (ctx->tx_conf == TLS_HW)
239 tls_device_write_space(sk, ctx);
240 else
241#endif
242 tls_sw_write_space(sk, ctx);
243
244 ctx->sk_write_space(sk);
245}
246
247/**
248 * tls_ctx_free() - free TLS ULP context
249 * @sk: socket to with @ctx is attached
250 * @ctx: TLS context structure
251 *
252 * Free TLS context. If @sk is %NULL caller guarantees that the socket
253 * to which @ctx was attached has no outstanding references.
254 */
255void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
256{
257 if (!ctx)
258 return;
259
260 memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
261 memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
262 mutex_destroy(&ctx->tx_lock);
263
264 if (sk)
265 kfree_rcu(ctx, rcu);
266 else
267 kfree(ctx);
268}
269
270static void tls_sk_proto_cleanup(struct sock *sk,
271 struct tls_context *ctx, long timeo)
272{
273 if (unlikely(sk->sk_write_pending) &&
274 !wait_on_pending_writer(sk, &timeo))
275 tls_handle_open_record(sk, 0);
276
277 /* We need these for tls_sw_fallback handling of other packets */
278 if (ctx->tx_conf == TLS_SW) {
279 kfree(ctx->tx.rec_seq);
280 kfree(ctx->tx.iv);
281 tls_sw_release_resources_tx(sk);
282 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
283 } else if (ctx->tx_conf == TLS_HW) {
284 tls_device_free_resources_tx(sk);
285 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
286 }
287
288 if (ctx->rx_conf == TLS_SW) {
289 tls_sw_release_resources_rx(sk);
290 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
291 } else if (ctx->rx_conf == TLS_HW) {
292 tls_device_offload_cleanup_rx(sk);
293 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
294 }
295}
296
297static void tls_sk_proto_close(struct sock *sk, long timeout)
298{
299 struct inet_connection_sock *icsk = inet_csk(sk);
300 struct tls_context *ctx = tls_get_ctx(sk);
301 long timeo = sock_sndtimeo(sk, 0);
302 bool free_ctx;
303
304 if (ctx->tx_conf == TLS_SW)
305 tls_sw_cancel_work_tx(ctx);
306
307 lock_sock(sk);
308 free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
309
310 if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
311 tls_sk_proto_cleanup(sk, ctx, timeo);
312
313 write_lock_bh(&sk->sk_callback_lock);
314 if (free_ctx)
315 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
316 WRITE_ONCE(sk->sk_prot, ctx->sk_proto);
317 if (sk->sk_write_space == tls_write_space)
318 sk->sk_write_space = ctx->sk_write_space;
319 write_unlock_bh(&sk->sk_callback_lock);
320 release_sock(sk);
321 if (ctx->tx_conf == TLS_SW)
322 tls_sw_free_ctx_tx(ctx);
323 if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
324 tls_sw_strparser_done(ctx);
325 if (ctx->rx_conf == TLS_SW)
326 tls_sw_free_ctx_rx(ctx);
327 ctx->sk_proto->close(sk, timeout);
328
329 if (free_ctx)
330 tls_ctx_free(sk, ctx);
331}
332
333static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
334 int __user *optlen, int tx)
335{
336 int rc = 0;
337 struct tls_context *ctx = tls_get_ctx(sk);
338 struct tls_crypto_info *crypto_info;
339 struct cipher_context *cctx;
340 int len;
341
342 if (get_user(len, optlen))
343 return -EFAULT;
344
345 if (!optval || (len < sizeof(*crypto_info))) {
346 rc = -EINVAL;
347 goto out;
348 }
349
350 if (!ctx) {
351 rc = -EBUSY;
352 goto out;
353 }
354
355 /* get user crypto info */
356 if (tx) {
357 crypto_info = &ctx->crypto_send.info;
358 cctx = &ctx->tx;
359 } else {
360 crypto_info = &ctx->crypto_recv.info;
361 cctx = &ctx->rx;
362 }
363
364 if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
365 rc = -EBUSY;
366 goto out;
367 }
368
369 if (len == sizeof(*crypto_info)) {
370 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
371 rc = -EFAULT;
372 goto out;
373 }
374
375 switch (crypto_info->cipher_type) {
376 case TLS_CIPHER_AES_GCM_128: {
377 struct tls12_crypto_info_aes_gcm_128 *
378 crypto_info_aes_gcm_128 =
379 container_of(crypto_info,
380 struct tls12_crypto_info_aes_gcm_128,
381 info);
382
383 if (len != sizeof(*crypto_info_aes_gcm_128)) {
384 rc = -EINVAL;
385 goto out;
386 }
387 lock_sock(sk);
388 memcpy(crypto_info_aes_gcm_128->iv,
389 cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
390 TLS_CIPHER_AES_GCM_128_IV_SIZE);
391 memcpy(crypto_info_aes_gcm_128->rec_seq, cctx->rec_seq,
392 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
393 release_sock(sk);
394 if (copy_to_user(optval,
395 crypto_info_aes_gcm_128,
396 sizeof(*crypto_info_aes_gcm_128)))
397 rc = -EFAULT;
398 break;
399 }
400 case TLS_CIPHER_AES_GCM_256: {
401 struct tls12_crypto_info_aes_gcm_256 *
402 crypto_info_aes_gcm_256 =
403 container_of(crypto_info,
404 struct tls12_crypto_info_aes_gcm_256,
405 info);
406
407 if (len != sizeof(*crypto_info_aes_gcm_256)) {
408 rc = -EINVAL;
409 goto out;
410 }
411 lock_sock(sk);
412 memcpy(crypto_info_aes_gcm_256->iv,
413 cctx->iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
414 TLS_CIPHER_AES_GCM_256_IV_SIZE);
415 memcpy(crypto_info_aes_gcm_256->rec_seq, cctx->rec_seq,
416 TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
417 release_sock(sk);
418 if (copy_to_user(optval,
419 crypto_info_aes_gcm_256,
420 sizeof(*crypto_info_aes_gcm_256)))
421 rc = -EFAULT;
422 break;
423 }
424 case TLS_CIPHER_AES_CCM_128: {
425 struct tls12_crypto_info_aes_ccm_128 *aes_ccm_128 =
426 container_of(crypto_info,
427 struct tls12_crypto_info_aes_ccm_128, info);
428
429 if (len != sizeof(*aes_ccm_128)) {
430 rc = -EINVAL;
431 goto out;
432 }
433 lock_sock(sk);
434 memcpy(aes_ccm_128->iv,
435 cctx->iv + TLS_CIPHER_AES_CCM_128_SALT_SIZE,
436 TLS_CIPHER_AES_CCM_128_IV_SIZE);
437 memcpy(aes_ccm_128->rec_seq, cctx->rec_seq,
438 TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE);
439 release_sock(sk);
440 if (copy_to_user(optval, aes_ccm_128, sizeof(*aes_ccm_128)))
441 rc = -EFAULT;
442 break;
443 }
444 case TLS_CIPHER_CHACHA20_POLY1305: {
445 struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305 =
446 container_of(crypto_info,
447 struct tls12_crypto_info_chacha20_poly1305,
448 info);
449
450 if (len != sizeof(*chacha20_poly1305)) {
451 rc = -EINVAL;
452 goto out;
453 }
454 lock_sock(sk);
455 memcpy(chacha20_poly1305->iv,
456 cctx->iv + TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE,
457 TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);
458 memcpy(chacha20_poly1305->rec_seq, cctx->rec_seq,
459 TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE);
460 release_sock(sk);
461 if (copy_to_user(optval, chacha20_poly1305,
462 sizeof(*chacha20_poly1305)))
463 rc = -EFAULT;
464 break;
465 }
466 case TLS_CIPHER_SM4_GCM: {
467 struct tls12_crypto_info_sm4_gcm *sm4_gcm_info =
468 container_of(crypto_info,
469 struct tls12_crypto_info_sm4_gcm, info);
470
471 if (len != sizeof(*sm4_gcm_info)) {
472 rc = -EINVAL;
473 goto out;
474 }
475 lock_sock(sk);
476 memcpy(sm4_gcm_info->iv,
477 cctx->iv + TLS_CIPHER_SM4_GCM_SALT_SIZE,
478 TLS_CIPHER_SM4_GCM_IV_SIZE);
479 memcpy(sm4_gcm_info->rec_seq, cctx->rec_seq,
480 TLS_CIPHER_SM4_GCM_REC_SEQ_SIZE);
481 release_sock(sk);
482 if (copy_to_user(optval, sm4_gcm_info, sizeof(*sm4_gcm_info)))
483 rc = -EFAULT;
484 break;
485 }
486 case TLS_CIPHER_SM4_CCM: {
487 struct tls12_crypto_info_sm4_ccm *sm4_ccm_info =
488 container_of(crypto_info,
489 struct tls12_crypto_info_sm4_ccm, info);
490
491 if (len != sizeof(*sm4_ccm_info)) {
492 rc = -EINVAL;
493 goto out;
494 }
495 lock_sock(sk);
496 memcpy(sm4_ccm_info->iv,
497 cctx->iv + TLS_CIPHER_SM4_CCM_SALT_SIZE,
498 TLS_CIPHER_SM4_CCM_IV_SIZE);
499 memcpy(sm4_ccm_info->rec_seq, cctx->rec_seq,
500 TLS_CIPHER_SM4_CCM_REC_SEQ_SIZE);
501 release_sock(sk);
502 if (copy_to_user(optval, sm4_ccm_info, sizeof(*sm4_ccm_info)))
503 rc = -EFAULT;
504 break;
505 }
506 default:
507 rc = -EINVAL;
508 }
509
510out:
511 return rc;
512}
513
514static int do_tls_getsockopt(struct sock *sk, int optname,
515 char __user *optval, int __user *optlen)
516{
517 int rc = 0;
518
519 switch (optname) {
520 case TLS_TX:
521 case TLS_RX:
522 rc = do_tls_getsockopt_conf(sk, optval, optlen,
523 optname == TLS_TX);
524 break;
525 default:
526 rc = -ENOPROTOOPT;
527 break;
528 }
529 return rc;
530}
531
532static int tls_getsockopt(struct sock *sk, int level, int optname,
533 char __user *optval, int __user *optlen)
534{
535 struct tls_context *ctx = tls_get_ctx(sk);
536
537 if (level != SOL_TLS)
538 return ctx->sk_proto->getsockopt(sk, level,
539 optname, optval, optlen);
540
541 return do_tls_getsockopt(sk, optname, optval, optlen);
542}
543
544static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
545 unsigned int optlen, int tx)
546{
547 struct tls_crypto_info *crypto_info;
548 struct tls_crypto_info *alt_crypto_info;
549 struct tls_context *ctx = tls_get_ctx(sk);
550 size_t optsize;
551 int rc = 0;
552 int conf;
553
554 if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info))) {
555 rc = -EINVAL;
556 goto out;
557 }
558
559 if (tx) {
560 crypto_info = &ctx->crypto_send.info;
561 alt_crypto_info = &ctx->crypto_recv.info;
562 } else {
563 crypto_info = &ctx->crypto_recv.info;
564 alt_crypto_info = &ctx->crypto_send.info;
565 }
566
567 /* Currently we don't support set crypto info more than one time */
568 if (TLS_CRYPTO_INFO_READY(crypto_info)) {
569 rc = -EBUSY;
570 goto out;
571 }
572
573 rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
574 if (rc) {
575 rc = -EFAULT;
576 goto err_crypto_info;
577 }
578
579 /* check version */
580 if (crypto_info->version != TLS_1_2_VERSION &&
581 crypto_info->version != TLS_1_3_VERSION) {
582 rc = -EINVAL;
583 goto err_crypto_info;
584 }
585
586 /* Ensure that TLS version and ciphers are same in both directions */
587 if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
588 if (alt_crypto_info->version != crypto_info->version ||
589 alt_crypto_info->cipher_type != crypto_info->cipher_type) {
590 rc = -EINVAL;
591 goto err_crypto_info;
592 }
593 }
594
595 switch (crypto_info->cipher_type) {
596 case TLS_CIPHER_AES_GCM_128:
597 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
598 break;
599 case TLS_CIPHER_AES_GCM_256: {
600 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
601 break;
602 }
603 case TLS_CIPHER_AES_CCM_128:
604 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
605 break;
606 case TLS_CIPHER_CHACHA20_POLY1305:
607 optsize = sizeof(struct tls12_crypto_info_chacha20_poly1305);
608 break;
609 case TLS_CIPHER_SM4_GCM:
610 optsize = sizeof(struct tls12_crypto_info_sm4_gcm);
611 break;
612 case TLS_CIPHER_SM4_CCM:
613 optsize = sizeof(struct tls12_crypto_info_sm4_ccm);
614 break;
615 default:
616 rc = -EINVAL;
617 goto err_crypto_info;
618 }
619
620 if (optlen != optsize) {
621 rc = -EINVAL;
622 goto err_crypto_info;
623 }
624
625 rc = copy_from_sockptr_offset(crypto_info + 1, optval,
626 sizeof(*crypto_info),
627 optlen - sizeof(*crypto_info));
628 if (rc) {
629 rc = -EFAULT;
630 goto err_crypto_info;
631 }
632
633 if (tx) {
634 rc = tls_set_device_offload(sk, ctx);
635 conf = TLS_HW;
636 if (!rc) {
637 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
638 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
639 } else {
640 rc = tls_set_sw_offload(sk, ctx, 1);
641 if (rc)
642 goto err_crypto_info;
643 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
644 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
645 conf = TLS_SW;
646 }
647 } else {
648 rc = tls_set_device_offload_rx(sk, ctx);
649 conf = TLS_HW;
650 if (!rc) {
651 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
652 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
653 } else {
654 rc = tls_set_sw_offload(sk, ctx, 0);
655 if (rc)
656 goto err_crypto_info;
657 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
658 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
659 conf = TLS_SW;
660 }
661 tls_sw_strparser_arm(sk, ctx);
662 }
663
664 if (tx)
665 ctx->tx_conf = conf;
666 else
667 ctx->rx_conf = conf;
668 update_sk_prot(sk, ctx);
669 if (tx) {
670 ctx->sk_write_space = sk->sk_write_space;
671 sk->sk_write_space = tls_write_space;
672 } else {
673 sk->sk_socket->ops = &tls_sw_proto_ops;
674 }
675 goto out;
676
677err_crypto_info:
678 memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
679out:
680 return rc;
681}
682
683static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
684 unsigned int optlen)
685{
686 int rc = 0;
687
688 switch (optname) {
689 case TLS_TX:
690 case TLS_RX:
691 lock_sock(sk);
692 rc = do_tls_setsockopt_conf(sk, optval, optlen,
693 optname == TLS_TX);
694 release_sock(sk);
695 break;
696 default:
697 rc = -ENOPROTOOPT;
698 break;
699 }
700 return rc;
701}
702
703static int tls_setsockopt(struct sock *sk, int level, int optname,
704 sockptr_t optval, unsigned int optlen)
705{
706 struct tls_context *ctx = tls_get_ctx(sk);
707
708 if (level != SOL_TLS)
709 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
710 optlen);
711
712 return do_tls_setsockopt(sk, optname, optval, optlen);
713}
714
715struct tls_context *tls_ctx_create(struct sock *sk)
716{
717 struct inet_connection_sock *icsk = inet_csk(sk);
718 struct tls_context *ctx;
719
720 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
721 if (!ctx)
722 return NULL;
723
724 mutex_init(&ctx->tx_lock);
725 rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
726 ctx->sk_proto = READ_ONCE(sk->sk_prot);
727 ctx->sk = sk;
728 return ctx;
729}
730
731static void tls_build_proto(struct sock *sk)
732{
733 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
734 struct proto *prot = READ_ONCE(sk->sk_prot);
735
736 /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
737 if (ip_ver == TLSV6 &&
738 unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
739 mutex_lock(&tcpv6_prot_mutex);
740 if (likely(prot != saved_tcpv6_prot)) {
741 build_protos(tls_prots[TLSV6], prot);
742 smp_store_release(&saved_tcpv6_prot, prot);
743 }
744 mutex_unlock(&tcpv6_prot_mutex);
745 }
746
747 if (ip_ver == TLSV4 &&
748 unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
749 mutex_lock(&tcpv4_prot_mutex);
750 if (likely(prot != saved_tcpv4_prot)) {
751 build_protos(tls_prots[TLSV4], prot);
752 smp_store_release(&saved_tcpv4_prot, prot);
753 }
754 mutex_unlock(&tcpv4_prot_mutex);
755 }
756}
757
758static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
759 const struct proto *base)
760{
761 prot[TLS_BASE][TLS_BASE] = *base;
762 prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt;
763 prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt;
764 prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close;
765
766 prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
767 prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg;
768 prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage;
769
770 prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
771 prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg;
772 prot[TLS_BASE][TLS_SW].sock_is_readable = tls_sw_sock_is_readable;
773 prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close;
774
775 prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
776 prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg;
777 prot[TLS_SW][TLS_SW].sock_is_readable = tls_sw_sock_is_readable;
778 prot[TLS_SW][TLS_SW].close = tls_sk_proto_close;
779
780#ifdef CONFIG_TLS_DEVICE
781 prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
782 prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg;
783 prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage;
784
785 prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
786 prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg;
787 prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage;
788
789 prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
790
791 prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
792
793 prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
794#endif
795#ifdef CONFIG_TLS_TOE
796 prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
797 prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_toe_hash;
798 prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_toe_unhash;
799#endif
800}
801
802static int tls_init(struct sock *sk)
803{
804 struct tls_context *ctx;
805 int rc = 0;
806
807 tls_build_proto(sk);
808
809#ifdef CONFIG_TLS_TOE
810 if (tls_toe_bypass(sk))
811 return 0;
812#endif
813
814 /* The TLS ulp is currently supported only for TCP sockets
815 * in ESTABLISHED state.
816 * Supporting sockets in LISTEN state will require us
817 * to modify the accept implementation to clone rather then
818 * share the ulp context.
819 */
820 if (sk->sk_state != TCP_ESTABLISHED)
821 return -ENOTCONN;
822
823 /* allocate tls context */
824 write_lock_bh(&sk->sk_callback_lock);
825 ctx = tls_ctx_create(sk);
826 if (!ctx) {
827 rc = -ENOMEM;
828 goto out;
829 }
830
831 ctx->tx_conf = TLS_BASE;
832 ctx->rx_conf = TLS_BASE;
833 update_sk_prot(sk, ctx);
834out:
835 write_unlock_bh(&sk->sk_callback_lock);
836 return rc;
837}
838
839static void tls_update(struct sock *sk, struct proto *p,
840 void (*write_space)(struct sock *sk))
841{
842 struct tls_context *ctx;
843
844 ctx = tls_get_ctx(sk);
845 if (likely(ctx)) {
846 ctx->sk_write_space = write_space;
847 ctx->sk_proto = p;
848 } else {
849 /* Pairs with lockless read in sk_clone_lock(). */
850 WRITE_ONCE(sk->sk_prot, p);
851 sk->sk_write_space = write_space;
852 }
853}
854
855static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
856{
857 u16 version, cipher_type;
858 struct tls_context *ctx;
859 struct nlattr *start;
860 int err;
861
862 start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
863 if (!start)
864 return -EMSGSIZE;
865
866 rcu_read_lock();
867 ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
868 if (!ctx) {
869 err = 0;
870 goto nla_failure;
871 }
872 version = ctx->prot_info.version;
873 if (version) {
874 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
875 if (err)
876 goto nla_failure;
877 }
878 cipher_type = ctx->prot_info.cipher_type;
879 if (cipher_type) {
880 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
881 if (err)
882 goto nla_failure;
883 }
884 err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
885 if (err)
886 goto nla_failure;
887
888 err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
889 if (err)
890 goto nla_failure;
891
892 rcu_read_unlock();
893 nla_nest_end(skb, start);
894 return 0;
895
896nla_failure:
897 rcu_read_unlock();
898 nla_nest_cancel(skb, start);
899 return err;
900}
901
902static size_t tls_get_info_size(const struct sock *sk)
903{
904 size_t size = 0;
905
906 size += nla_total_size(0) + /* INET_ULP_INFO_TLS */
907 nla_total_size(sizeof(u16)) + /* TLS_INFO_VERSION */
908 nla_total_size(sizeof(u16)) + /* TLS_INFO_CIPHER */
909 nla_total_size(sizeof(u16)) + /* TLS_INFO_RXCONF */
910 nla_total_size(sizeof(u16)) + /* TLS_INFO_TXCONF */
911 0;
912
913 return size;
914}
915
916static int __net_init tls_init_net(struct net *net)
917{
918 int err;
919
920 net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
921 if (!net->mib.tls_statistics)
922 return -ENOMEM;
923
924 err = tls_proc_init(net);
925 if (err)
926 goto err_free_stats;
927
928 return 0;
929err_free_stats:
930 free_percpu(net->mib.tls_statistics);
931 return err;
932}
933
934static void __net_exit tls_exit_net(struct net *net)
935{
936 tls_proc_fini(net);
937 free_percpu(net->mib.tls_statistics);
938}
939
940static struct pernet_operations tls_proc_ops = {
941 .init = tls_init_net,
942 .exit = tls_exit_net,
943};
944
945static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
946 .name = "tls",
947 .owner = THIS_MODULE,
948 .init = tls_init,
949 .update = tls_update,
950 .get_info = tls_get_info,
951 .get_info_size = tls_get_info_size,
952};
953
954static int __init tls_register(void)
955{
956 int err;
957
958 err = register_pernet_subsys(&tls_proc_ops);
959 if (err)
960 return err;
961
962 tls_sw_proto_ops = inet_stream_ops;
963 tls_sw_proto_ops.splice_read = tls_sw_splice_read;
964 tls_sw_proto_ops.sendpage_locked = tls_sw_sendpage_locked;
965
966 tls_device_init();
967 tcp_register_ulp(&tcp_tls_ulp_ops);
968
969 return 0;
970}
971
972static void __exit tls_unregister(void)
973{
974 tcp_unregister_ulp(&tcp_tls_ulp_ops);
975 tls_device_cleanup();
976 unregister_pernet_subsys(&tls_proc_ops);
977}
978
979module_init(tls_register);
980module_exit(tls_unregister);