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
48#include "tls.h"
49
50MODULE_AUTHOR("Mellanox Technologies");
51MODULE_DESCRIPTION("Transport Layer Security Support");
52MODULE_LICENSE("Dual BSD/GPL");
53MODULE_ALIAS_TCP_ULP("tls");
54
55enum {
56 TLSV4,
57 TLSV6,
58 TLS_NUM_PROTS,
59};
60
61#define CHECK_CIPHER_DESC(cipher,ci) \
62 static_assert(cipher ## _IV_SIZE <= TLS_MAX_IV_SIZE); \
63 static_assert(cipher ## _SALT_SIZE <= TLS_MAX_SALT_SIZE); \
64 static_assert(cipher ## _REC_SEQ_SIZE <= TLS_MAX_REC_SEQ_SIZE); \
65 static_assert(cipher ## _TAG_SIZE == TLS_TAG_SIZE); \
66 static_assert(sizeof_field(struct ci, iv) == cipher ## _IV_SIZE); \
67 static_assert(sizeof_field(struct ci, key) == cipher ## _KEY_SIZE); \
68 static_assert(sizeof_field(struct ci, salt) == cipher ## _SALT_SIZE); \
69 static_assert(sizeof_field(struct ci, rec_seq) == cipher ## _REC_SEQ_SIZE);
70
71#define __CIPHER_DESC(ci) \
72 .iv_offset = offsetof(struct ci, iv), \
73 .key_offset = offsetof(struct ci, key), \
74 .salt_offset = offsetof(struct ci, salt), \
75 .rec_seq_offset = offsetof(struct ci, rec_seq), \
76 .crypto_info = sizeof(struct ci)
77
78#define CIPHER_DESC(cipher,ci,algname,_offloadable) [cipher - TLS_CIPHER_MIN] = { \
79 .nonce = cipher ## _IV_SIZE, \
80 .iv = cipher ## _IV_SIZE, \
81 .key = cipher ## _KEY_SIZE, \
82 .salt = cipher ## _SALT_SIZE, \
83 .tag = cipher ## _TAG_SIZE, \
84 .rec_seq = cipher ## _REC_SEQ_SIZE, \
85 .cipher_name = algname, \
86 .offloadable = _offloadable, \
87 __CIPHER_DESC(ci), \
88}
89
90#define CIPHER_DESC_NONCE0(cipher,ci,algname,_offloadable) [cipher - TLS_CIPHER_MIN] = { \
91 .nonce = 0, \
92 .iv = cipher ## _IV_SIZE, \
93 .key = cipher ## _KEY_SIZE, \
94 .salt = cipher ## _SALT_SIZE, \
95 .tag = cipher ## _TAG_SIZE, \
96 .rec_seq = cipher ## _REC_SEQ_SIZE, \
97 .cipher_name = algname, \
98 .offloadable = _offloadable, \
99 __CIPHER_DESC(ci), \
100}
101
102const struct tls_cipher_desc tls_cipher_desc[TLS_CIPHER_MAX + 1 - TLS_CIPHER_MIN] = {
103 CIPHER_DESC(TLS_CIPHER_AES_GCM_128, tls12_crypto_info_aes_gcm_128, "gcm(aes)", true),
104 CIPHER_DESC(TLS_CIPHER_AES_GCM_256, tls12_crypto_info_aes_gcm_256, "gcm(aes)", true),
105 CIPHER_DESC(TLS_CIPHER_AES_CCM_128, tls12_crypto_info_aes_ccm_128, "ccm(aes)", false),
106 CIPHER_DESC_NONCE0(TLS_CIPHER_CHACHA20_POLY1305, tls12_crypto_info_chacha20_poly1305, "rfc7539(chacha20,poly1305)", false),
107 CIPHER_DESC(TLS_CIPHER_SM4_GCM, tls12_crypto_info_sm4_gcm, "gcm(sm4)", false),
108 CIPHER_DESC(TLS_CIPHER_SM4_CCM, tls12_crypto_info_sm4_ccm, "ccm(sm4)", false),
109 CIPHER_DESC(TLS_CIPHER_ARIA_GCM_128, tls12_crypto_info_aria_gcm_128, "gcm(aria)", false),
110 CIPHER_DESC(TLS_CIPHER_ARIA_GCM_256, tls12_crypto_info_aria_gcm_256, "gcm(aria)", false),
111};
112
113CHECK_CIPHER_DESC(TLS_CIPHER_AES_GCM_128, tls12_crypto_info_aes_gcm_128);
114CHECK_CIPHER_DESC(TLS_CIPHER_AES_GCM_256, tls12_crypto_info_aes_gcm_256);
115CHECK_CIPHER_DESC(TLS_CIPHER_AES_CCM_128, tls12_crypto_info_aes_ccm_128);
116CHECK_CIPHER_DESC(TLS_CIPHER_CHACHA20_POLY1305, tls12_crypto_info_chacha20_poly1305);
117CHECK_CIPHER_DESC(TLS_CIPHER_SM4_GCM, tls12_crypto_info_sm4_gcm);
118CHECK_CIPHER_DESC(TLS_CIPHER_SM4_CCM, tls12_crypto_info_sm4_ccm);
119CHECK_CIPHER_DESC(TLS_CIPHER_ARIA_GCM_128, tls12_crypto_info_aria_gcm_128);
120CHECK_CIPHER_DESC(TLS_CIPHER_ARIA_GCM_256, tls12_crypto_info_aria_gcm_256);
121
122static const struct proto *saved_tcpv6_prot;
123static DEFINE_MUTEX(tcpv6_prot_mutex);
124static const struct proto *saved_tcpv4_prot;
125static DEFINE_MUTEX(tcpv4_prot_mutex);
126static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
127static struct proto_ops tls_proto_ops[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
128static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
129 const struct proto *base);
130
131void update_sk_prot(struct sock *sk, struct tls_context *ctx)
132{
133 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
134
135 WRITE_ONCE(sk->sk_prot,
136 &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]);
137 WRITE_ONCE(sk->sk_socket->ops,
138 &tls_proto_ops[ip_ver][ctx->tx_conf][ctx->rx_conf]);
139}
140
141int wait_on_pending_writer(struct sock *sk, long *timeo)
142{
143 DEFINE_WAIT_FUNC(wait, woken_wake_function);
144 int ret, rc = 0;
145
146 add_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait);
147 while (1) {
148 if (!*timeo) {
149 rc = -EAGAIN;
150 break;
151 }
152
153 if (signal_pending(current)) {
154 rc = sock_intr_errno(timeo: *timeo);
155 break;
156 }
157
158 ret = sk_wait_event(sk, timeo,
159 !READ_ONCE(sk->sk_write_pending), &wait);
160 if (ret) {
161 if (ret < 0)
162 rc = ret;
163 break;
164 }
165 }
166 remove_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait);
167 return rc;
168}
169
170int tls_push_sg(struct sock *sk,
171 struct tls_context *ctx,
172 struct scatterlist *sg,
173 u16 first_offset,
174 int flags)
175{
176 struct bio_vec bvec;
177 struct msghdr msg = {
178 .msg_flags = MSG_SPLICE_PAGES | flags,
179 };
180 int ret = 0;
181 struct page *p;
182 size_t size;
183 int offset = first_offset;
184
185 size = sg->length - offset;
186 offset += sg->offset;
187
188 ctx->splicing_pages = true;
189 while (1) {
190 /* is sending application-limited? */
191 tcp_rate_check_app_limited(sk);
192 p = sg_page(sg);
193retry:
194 bvec_set_page(bv: &bvec, page: p, len: size, offset);
195 iov_iter_bvec(i: &msg.msg_iter, ITER_SOURCE, bvec: &bvec, nr_segs: 1, count: size);
196
197 ret = tcp_sendmsg_locked(sk, msg: &msg, size);
198
199 if (ret != size) {
200 if (ret > 0) {
201 offset += ret;
202 size -= ret;
203 goto retry;
204 }
205
206 offset -= sg->offset;
207 ctx->partially_sent_offset = offset;
208 ctx->partially_sent_record = (void *)sg;
209 ctx->splicing_pages = false;
210 return ret;
211 }
212
213 put_page(page: p);
214 sk_mem_uncharge(sk, size: sg->length);
215 sg = sg_next(sg);
216 if (!sg)
217 break;
218
219 offset = sg->offset;
220 size = sg->length;
221 }
222
223 ctx->splicing_pages = false;
224
225 return 0;
226}
227
228static int tls_handle_open_record(struct sock *sk, int flags)
229{
230 struct tls_context *ctx = tls_get_ctx(sk);
231
232 if (tls_is_pending_open_record(tls_ctx: ctx))
233 return ctx->push_pending_record(sk, flags);
234
235 return 0;
236}
237
238int tls_process_cmsg(struct sock *sk, struct msghdr *msg,
239 unsigned char *record_type)
240{
241 struct cmsghdr *cmsg;
242 int rc = -EINVAL;
243
244 for_each_cmsghdr(cmsg, msg) {
245 if (!CMSG_OK(msg, cmsg))
246 return -EINVAL;
247 if (cmsg->cmsg_level != SOL_TLS)
248 continue;
249
250 switch (cmsg->cmsg_type) {
251 case TLS_SET_RECORD_TYPE:
252 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
253 return -EINVAL;
254
255 if (msg->msg_flags & MSG_MORE)
256 return -EINVAL;
257
258 *record_type = *(unsigned char *)CMSG_DATA(cmsg);
259
260 rc = tls_handle_open_record(sk, flags: msg->msg_flags);
261 break;
262 default:
263 return -EINVAL;
264 }
265 }
266
267 return rc;
268}
269
270int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
271 int flags)
272{
273 struct scatterlist *sg;
274 u16 offset;
275
276 sg = ctx->partially_sent_record;
277 offset = ctx->partially_sent_offset;
278
279 ctx->partially_sent_record = NULL;
280 return tls_push_sg(sk, ctx, sg, first_offset: offset, flags);
281}
282
283void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
284{
285 struct scatterlist *sg;
286
287 for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
288 put_page(page: sg_page(sg));
289 sk_mem_uncharge(sk, size: sg->length);
290 }
291 ctx->partially_sent_record = NULL;
292}
293
294static void tls_write_space(struct sock *sk)
295{
296 struct tls_context *ctx = tls_get_ctx(sk);
297
298 /* If splicing_pages call lower protocol write space handler
299 * to ensure we wake up any waiting operations there. For example
300 * if splicing pages where to call sk_wait_event.
301 */
302 if (ctx->splicing_pages) {
303 ctx->sk_write_space(sk);
304 return;
305 }
306
307#ifdef CONFIG_TLS_DEVICE
308 if (ctx->tx_conf == TLS_HW)
309 tls_device_write_space(sk, ctx);
310 else
311#endif
312 tls_sw_write_space(sk, ctx);
313
314 ctx->sk_write_space(sk);
315}
316
317/**
318 * tls_ctx_free() - free TLS ULP context
319 * @sk: socket to with @ctx is attached
320 * @ctx: TLS context structure
321 *
322 * Free TLS context. If @sk is %NULL caller guarantees that the socket
323 * to which @ctx was attached has no outstanding references.
324 */
325void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
326{
327 if (!ctx)
328 return;
329
330 memzero_explicit(s: &ctx->crypto_send, count: sizeof(ctx->crypto_send));
331 memzero_explicit(s: &ctx->crypto_recv, count: sizeof(ctx->crypto_recv));
332 mutex_destroy(lock: &ctx->tx_lock);
333
334 if (sk)
335 kfree_rcu(ctx, rcu);
336 else
337 kfree(objp: ctx);
338}
339
340static void tls_sk_proto_cleanup(struct sock *sk,
341 struct tls_context *ctx, long timeo)
342{
343 if (unlikely(sk->sk_write_pending) &&
344 !wait_on_pending_writer(sk, timeo: &timeo))
345 tls_handle_open_record(sk, flags: 0);
346
347 /* We need these for tls_sw_fallback handling of other packets */
348 if (ctx->tx_conf == TLS_SW) {
349 tls_sw_release_resources_tx(sk);
350 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
351 } else if (ctx->tx_conf == TLS_HW) {
352 tls_device_free_resources_tx(sk);
353 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
354 }
355
356 if (ctx->rx_conf == TLS_SW) {
357 tls_sw_release_resources_rx(sk);
358 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
359 } else if (ctx->rx_conf == TLS_HW) {
360 tls_device_offload_cleanup_rx(sk);
361 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
362 }
363}
364
365static void tls_sk_proto_close(struct sock *sk, long timeout)
366{
367 struct inet_connection_sock *icsk = inet_csk(sk);
368 struct tls_context *ctx = tls_get_ctx(sk);
369 long timeo = sock_sndtimeo(sk, noblock: 0);
370 bool free_ctx;
371
372 if (ctx->tx_conf == TLS_SW)
373 tls_sw_cancel_work_tx(tls_ctx: ctx);
374
375 lock_sock(sk);
376 free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
377
378 if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
379 tls_sk_proto_cleanup(sk, ctx, timeo);
380
381 write_lock_bh(&sk->sk_callback_lock);
382 if (free_ctx)
383 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
384 WRITE_ONCE(sk->sk_prot, ctx->sk_proto);
385 if (sk->sk_write_space == tls_write_space)
386 sk->sk_write_space = ctx->sk_write_space;
387 write_unlock_bh(&sk->sk_callback_lock);
388 release_sock(sk);
389 if (ctx->tx_conf == TLS_SW)
390 tls_sw_free_ctx_tx(tls_ctx: ctx);
391 if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
392 tls_sw_strparser_done(tls_ctx: ctx);
393 if (ctx->rx_conf == TLS_SW)
394 tls_sw_free_ctx_rx(tls_ctx: ctx);
395 ctx->sk_proto->close(sk, timeout);
396
397 if (free_ctx)
398 tls_ctx_free(sk, ctx);
399}
400
401static __poll_t tls_sk_poll(struct file *file, struct socket *sock,
402 struct poll_table_struct *wait)
403{
404 struct tls_sw_context_rx *ctx;
405 struct tls_context *tls_ctx;
406 struct sock *sk = sock->sk;
407 struct sk_psock *psock;
408 __poll_t mask = 0;
409 u8 shutdown;
410 int state;
411
412 mask = tcp_poll(file, sock, wait);
413
414 state = inet_sk_state_load(sk);
415 shutdown = READ_ONCE(sk->sk_shutdown);
416 if (unlikely(state != TCP_ESTABLISHED || shutdown & RCV_SHUTDOWN))
417 return mask;
418
419 tls_ctx = tls_get_ctx(sk);
420 ctx = tls_sw_ctx_rx(tls_ctx);
421 psock = sk_psock_get(sk);
422
423 if ((skb_queue_empty_lockless(list: &ctx->rx_list) &&
424 !tls_strp_msg_ready(ctx) &&
425 sk_psock_queue_empty(psock)) ||
426 READ_ONCE(ctx->key_update_pending))
427 mask &= ~(EPOLLIN | EPOLLRDNORM);
428
429 if (psock)
430 sk_psock_put(sk, psock);
431
432 return mask;
433}
434
435static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
436 int __user *optlen, int tx)
437{
438 int rc = 0;
439 const struct tls_cipher_desc *cipher_desc;
440 struct tls_context *ctx = tls_get_ctx(sk);
441 struct tls_crypto_info *crypto_info;
442 struct cipher_context *cctx;
443 int len;
444
445 if (get_user(len, optlen))
446 return -EFAULT;
447
448 if (!optval || (len < sizeof(*crypto_info))) {
449 rc = -EINVAL;
450 goto out;
451 }
452
453 if (!ctx) {
454 rc = -EBUSY;
455 goto out;
456 }
457
458 /* get user crypto info */
459 if (tx) {
460 crypto_info = &ctx->crypto_send.info;
461 cctx = &ctx->tx;
462 } else {
463 crypto_info = &ctx->crypto_recv.info;
464 cctx = &ctx->rx;
465 }
466
467 if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
468 rc = -EBUSY;
469 goto out;
470 }
471
472 if (len == sizeof(*crypto_info)) {
473 if (copy_to_user(to: optval, from: crypto_info, n: sizeof(*crypto_info)))
474 rc = -EFAULT;
475 goto out;
476 }
477
478 cipher_desc = get_cipher_desc(cipher_type: crypto_info->cipher_type);
479 if (!cipher_desc || len != cipher_desc->crypto_info) {
480 rc = -EINVAL;
481 goto out;
482 }
483
484 memcpy(crypto_info_iv(crypto_info, cipher_desc),
485 cctx->iv + cipher_desc->salt, cipher_desc->iv);
486 memcpy(crypto_info_rec_seq(crypto_info, cipher_desc),
487 cctx->rec_seq, cipher_desc->rec_seq);
488
489 if (copy_to_user(to: optval, from: crypto_info, n: cipher_desc->crypto_info))
490 rc = -EFAULT;
491
492out:
493 return rc;
494}
495
496static int do_tls_getsockopt_tx_zc(struct sock *sk, char __user *optval,
497 int __user *optlen)
498{
499 struct tls_context *ctx = tls_get_ctx(sk);
500 unsigned int value;
501 int len;
502
503 if (get_user(len, optlen))
504 return -EFAULT;
505
506 if (len != sizeof(value))
507 return -EINVAL;
508
509 value = ctx->zerocopy_sendfile;
510 if (copy_to_user(to: optval, from: &value, n: sizeof(value)))
511 return -EFAULT;
512
513 return 0;
514}
515
516static int do_tls_getsockopt_no_pad(struct sock *sk, char __user *optval,
517 int __user *optlen)
518{
519 struct tls_context *ctx = tls_get_ctx(sk);
520 int value, len;
521
522 if (ctx->prot_info.version != TLS_1_3_VERSION)
523 return -EINVAL;
524
525 if (get_user(len, optlen))
526 return -EFAULT;
527 if (len < sizeof(value))
528 return -EINVAL;
529
530 value = -EINVAL;
531 if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
532 value = ctx->rx_no_pad;
533 if (value < 0)
534 return value;
535
536 if (put_user(sizeof(value), optlen))
537 return -EFAULT;
538 if (copy_to_user(to: optval, from: &value, n: sizeof(value)))
539 return -EFAULT;
540
541 return 0;
542}
543
544static int do_tls_getsockopt_tx_payload_len(struct sock *sk, char __user *optval,
545 int __user *optlen)
546{
547 struct tls_context *ctx = tls_get_ctx(sk);
548 u16 payload_len = ctx->tx_max_payload_len;
549 int len;
550
551 if (get_user(len, optlen))
552 return -EFAULT;
553
554 if (len < sizeof(payload_len))
555 return -EINVAL;
556
557 if (put_user(sizeof(payload_len), optlen))
558 return -EFAULT;
559
560 if (copy_to_user(to: optval, from: &payload_len, n: sizeof(payload_len)))
561 return -EFAULT;
562
563 return 0;
564}
565
566static int do_tls_getsockopt(struct sock *sk, int optname,
567 char __user *optval, int __user *optlen)
568{
569 int rc = 0;
570
571 lock_sock(sk);
572
573 switch (optname) {
574 case TLS_TX:
575 case TLS_RX:
576 rc = do_tls_getsockopt_conf(sk, optval, optlen,
577 tx: optname == TLS_TX);
578 break;
579 case TLS_TX_ZEROCOPY_RO:
580 rc = do_tls_getsockopt_tx_zc(sk, optval, optlen);
581 break;
582 case TLS_RX_EXPECT_NO_PAD:
583 rc = do_tls_getsockopt_no_pad(sk, optval, optlen);
584 break;
585 case TLS_TX_MAX_PAYLOAD_LEN:
586 rc = do_tls_getsockopt_tx_payload_len(sk, optval, optlen);
587 break;
588 default:
589 rc = -ENOPROTOOPT;
590 break;
591 }
592
593 release_sock(sk);
594
595 return rc;
596}
597
598static int tls_getsockopt(struct sock *sk, int level, int optname,
599 char __user *optval, int __user *optlen)
600{
601 struct tls_context *ctx = tls_get_ctx(sk);
602
603 if (level != SOL_TLS)
604 return ctx->sk_proto->getsockopt(sk, level,
605 optname, optval, optlen);
606
607 return do_tls_getsockopt(sk, optname, optval, optlen);
608}
609
610static int validate_crypto_info(const struct tls_crypto_info *crypto_info,
611 const struct tls_crypto_info *alt_crypto_info)
612{
613 if (crypto_info->version != TLS_1_2_VERSION &&
614 crypto_info->version != TLS_1_3_VERSION)
615 return -EINVAL;
616
617 switch (crypto_info->cipher_type) {
618 case TLS_CIPHER_ARIA_GCM_128:
619 case TLS_CIPHER_ARIA_GCM_256:
620 if (crypto_info->version != TLS_1_2_VERSION)
621 return -EINVAL;
622 break;
623 }
624
625 /* Ensure that TLS version and ciphers are same in both directions */
626 if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
627 if (alt_crypto_info->version != crypto_info->version ||
628 alt_crypto_info->cipher_type != crypto_info->cipher_type)
629 return -EINVAL;
630 }
631
632 return 0;
633}
634
635static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
636 unsigned int optlen, int tx)
637{
638 struct tls_crypto_info *crypto_info, *alt_crypto_info;
639 struct tls_crypto_info *old_crypto_info = NULL;
640 struct tls_context *ctx = tls_get_ctx(sk);
641 const struct tls_cipher_desc *cipher_desc;
642 union tls_crypto_context *crypto_ctx;
643 union tls_crypto_context tmp = {};
644 bool update = false;
645 int rc = 0;
646 int conf;
647
648 if (sockptr_is_null(sockptr: optval) || (optlen < sizeof(*crypto_info)))
649 return -EINVAL;
650
651 if (tx) {
652 crypto_ctx = &ctx->crypto_send;
653 alt_crypto_info = &ctx->crypto_recv.info;
654 } else {
655 crypto_ctx = &ctx->crypto_recv;
656 alt_crypto_info = &ctx->crypto_send.info;
657 }
658
659 crypto_info = &crypto_ctx->info;
660
661 if (TLS_CRYPTO_INFO_READY(crypto_info)) {
662 /* Currently we only support setting crypto info more
663 * than one time for TLS 1.3
664 */
665 if (crypto_info->version != TLS_1_3_VERSION) {
666 TLS_INC_STATS(sock_net(sk), tx ? LINUX_MIB_TLSTXREKEYERROR
667 : LINUX_MIB_TLSRXREKEYERROR);
668 return -EBUSY;
669 }
670
671 update = true;
672 old_crypto_info = crypto_info;
673 crypto_info = &tmp.info;
674 crypto_ctx = &tmp;
675 }
676
677 rc = copy_from_sockptr(dst: crypto_info, src: optval, size: sizeof(*crypto_info));
678 if (rc) {
679 rc = -EFAULT;
680 goto err_crypto_info;
681 }
682
683 if (update) {
684 /* Ensure that TLS version and ciphers are not modified */
685 if (crypto_info->version != old_crypto_info->version ||
686 crypto_info->cipher_type != old_crypto_info->cipher_type)
687 rc = -EINVAL;
688 } else {
689 rc = validate_crypto_info(crypto_info, alt_crypto_info);
690 }
691 if (rc)
692 goto err_crypto_info;
693
694 cipher_desc = get_cipher_desc(cipher_type: crypto_info->cipher_type);
695 if (!cipher_desc) {
696 rc = -EINVAL;
697 goto err_crypto_info;
698 }
699
700 if (optlen != cipher_desc->crypto_info) {
701 rc = -EINVAL;
702 goto err_crypto_info;
703 }
704
705 rc = copy_from_sockptr_offset(dst: crypto_info + 1, src: optval,
706 offset: sizeof(*crypto_info),
707 size: optlen - sizeof(*crypto_info));
708 if (rc) {
709 rc = -EFAULT;
710 goto err_crypto_info;
711 }
712
713 if (tx) {
714 rc = tls_set_device_offload(sk);
715 conf = TLS_HW;
716 if (!rc) {
717 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
718 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
719 } else {
720 rc = tls_set_sw_offload(sk, tx: 1,
721 new_crypto_info: update ? crypto_info : NULL);
722 if (rc)
723 goto err_crypto_info;
724
725 if (update) {
726 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXREKEYOK);
727 } else {
728 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
729 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
730 }
731 conf = TLS_SW;
732 }
733 } else {
734 rc = tls_set_device_offload_rx(sk, ctx);
735 conf = TLS_HW;
736 if (!rc) {
737 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
738 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
739 } else {
740 rc = tls_set_sw_offload(sk, tx: 0,
741 new_crypto_info: update ? crypto_info : NULL);
742 if (rc)
743 goto err_crypto_info;
744
745 if (update) {
746 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXREKEYOK);
747 } else {
748 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
749 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
750 }
751 conf = TLS_SW;
752 }
753 if (!update)
754 tls_sw_strparser_arm(sk, ctx);
755 }
756
757 if (tx)
758 ctx->tx_conf = conf;
759 else
760 ctx->rx_conf = conf;
761 update_sk_prot(sk, ctx);
762
763 if (update)
764 return 0;
765
766 if (tx) {
767 ctx->sk_write_space = sk->sk_write_space;
768 sk->sk_write_space = tls_write_space;
769 } else {
770 struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(tls_ctx: ctx);
771
772 tls_strp_check_rcv(strp: &rx_ctx->strp);
773 }
774 return 0;
775
776err_crypto_info:
777 if (update) {
778 TLS_INC_STATS(sock_net(sk), tx ? LINUX_MIB_TLSTXREKEYERROR
779 : LINUX_MIB_TLSRXREKEYERROR);
780 }
781 memzero_explicit(s: crypto_ctx, count: sizeof(*crypto_ctx));
782 return rc;
783}
784
785static int do_tls_setsockopt_tx_zc(struct sock *sk, sockptr_t optval,
786 unsigned int optlen)
787{
788 struct tls_context *ctx = tls_get_ctx(sk);
789 unsigned int value;
790
791 if (sockptr_is_null(sockptr: optval) || optlen != sizeof(value))
792 return -EINVAL;
793
794 if (copy_from_sockptr(dst: &value, src: optval, size: sizeof(value)))
795 return -EFAULT;
796
797 if (value > 1)
798 return -EINVAL;
799
800 ctx->zerocopy_sendfile = value;
801
802 return 0;
803}
804
805static int do_tls_setsockopt_no_pad(struct sock *sk, sockptr_t optval,
806 unsigned int optlen)
807{
808 struct tls_context *ctx = tls_get_ctx(sk);
809 u32 val;
810 int rc;
811
812 if (ctx->prot_info.version != TLS_1_3_VERSION ||
813 sockptr_is_null(sockptr: optval) || optlen < sizeof(val))
814 return -EINVAL;
815
816 rc = copy_from_sockptr(dst: &val, src: optval, size: sizeof(val));
817 if (rc)
818 return -EFAULT;
819 if (val > 1)
820 return -EINVAL;
821 rc = check_zeroed_sockptr(src: optval, offset: sizeof(val), size: optlen - sizeof(val));
822 if (rc < 1)
823 return rc == 0 ? -EINVAL : rc;
824
825 lock_sock(sk);
826 rc = -EINVAL;
827 if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) {
828 ctx->rx_no_pad = val;
829 tls_update_rx_zc_capable(tls_ctx: ctx);
830 rc = 0;
831 }
832 release_sock(sk);
833
834 return rc;
835}
836
837static int do_tls_setsockopt_tx_payload_len(struct sock *sk, sockptr_t optval,
838 unsigned int optlen)
839{
840 struct tls_context *ctx = tls_get_ctx(sk);
841 struct tls_sw_context_tx *sw_ctx = tls_sw_ctx_tx(tls_ctx: ctx);
842 u16 value;
843 bool tls_13 = ctx->prot_info.version == TLS_1_3_VERSION;
844
845 if (sw_ctx && sw_ctx->open_rec)
846 return -EBUSY;
847
848 if (sockptr_is_null(sockptr: optval) || optlen != sizeof(value))
849 return -EINVAL;
850
851 if (copy_from_sockptr(dst: &value, src: optval, size: sizeof(value)))
852 return -EFAULT;
853
854 if (value < TLS_MIN_RECORD_SIZE_LIM - (tls_13 ? 1 : 0) ||
855 value > TLS_MAX_PAYLOAD_SIZE)
856 return -EINVAL;
857
858 ctx->tx_max_payload_len = value;
859
860 return 0;
861}
862
863static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
864 unsigned int optlen)
865{
866 int rc = 0;
867
868 switch (optname) {
869 case TLS_TX:
870 case TLS_RX:
871 lock_sock(sk);
872 rc = do_tls_setsockopt_conf(sk, optval, optlen,
873 tx: optname == TLS_TX);
874 release_sock(sk);
875 break;
876 case TLS_TX_ZEROCOPY_RO:
877 lock_sock(sk);
878 rc = do_tls_setsockopt_tx_zc(sk, optval, optlen);
879 release_sock(sk);
880 break;
881 case TLS_RX_EXPECT_NO_PAD:
882 rc = do_tls_setsockopt_no_pad(sk, optval, optlen);
883 break;
884 case TLS_TX_MAX_PAYLOAD_LEN:
885 lock_sock(sk);
886 rc = do_tls_setsockopt_tx_payload_len(sk, optval, optlen);
887 release_sock(sk);
888 break;
889 default:
890 rc = -ENOPROTOOPT;
891 break;
892 }
893 return rc;
894}
895
896static int tls_setsockopt(struct sock *sk, int level, int optname,
897 sockptr_t optval, unsigned int optlen)
898{
899 struct tls_context *ctx = tls_get_ctx(sk);
900
901 if (level != SOL_TLS)
902 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
903 optlen);
904
905 return do_tls_setsockopt(sk, optname, optval, optlen);
906}
907
908static int tls_disconnect(struct sock *sk, int flags)
909{
910 return -EOPNOTSUPP;
911}
912
913struct tls_context *tls_ctx_create(struct sock *sk)
914{
915 struct inet_connection_sock *icsk = inet_csk(sk);
916 struct tls_context *ctx;
917
918 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
919 if (!ctx)
920 return NULL;
921
922 mutex_init(&ctx->tx_lock);
923 ctx->sk_proto = READ_ONCE(sk->sk_prot);
924 ctx->sk = sk;
925 /* Release semantic of rcu_assign_pointer() ensures that
926 * ctx->sk_proto is visible before changing sk->sk_prot in
927 * update_sk_prot(), and prevents reading uninitialized value in
928 * tls_{getsockopt, setsockopt}. Note that we do not need a
929 * read barrier in tls_{getsockopt,setsockopt} as there is an
930 * address dependency between sk->sk_proto->{getsockopt,setsockopt}
931 * and ctx->sk_proto.
932 */
933 rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
934 return ctx;
935}
936
937static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
938 const struct proto_ops *base)
939{
940 ops[TLS_BASE][TLS_BASE] = *base;
941
942 ops[TLS_SW ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
943 ops[TLS_SW ][TLS_BASE].splice_eof = tls_sw_splice_eof;
944
945 ops[TLS_BASE][TLS_SW ] = ops[TLS_BASE][TLS_BASE];
946 ops[TLS_BASE][TLS_SW ].splice_read = tls_sw_splice_read;
947 ops[TLS_BASE][TLS_SW ].poll = tls_sk_poll;
948 ops[TLS_BASE][TLS_SW ].read_sock = tls_sw_read_sock;
949
950 ops[TLS_SW ][TLS_SW ] = ops[TLS_SW ][TLS_BASE];
951 ops[TLS_SW ][TLS_SW ].splice_read = tls_sw_splice_read;
952 ops[TLS_SW ][TLS_SW ].poll = tls_sk_poll;
953 ops[TLS_SW ][TLS_SW ].read_sock = tls_sw_read_sock;
954
955#ifdef CONFIG_TLS_DEVICE
956 ops[TLS_HW ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
957
958 ops[TLS_HW ][TLS_SW ] = ops[TLS_BASE][TLS_SW ];
959
960 ops[TLS_BASE][TLS_HW ] = ops[TLS_BASE][TLS_SW ];
961
962 ops[TLS_SW ][TLS_HW ] = ops[TLS_SW ][TLS_SW ];
963
964 ops[TLS_HW ][TLS_HW ] = ops[TLS_HW ][TLS_SW ];
965#endif
966#ifdef CONFIG_TLS_TOE
967 ops[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
968#endif
969}
970
971static void tls_build_proto(struct sock *sk)
972{
973 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
974 struct proto *prot = READ_ONCE(sk->sk_prot);
975
976 /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
977 if (ip_ver == TLSV6 &&
978 unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
979 mutex_lock(&tcpv6_prot_mutex);
980 if (likely(prot != saved_tcpv6_prot)) {
981 build_protos(prot: tls_prots[TLSV6], base: prot);
982 build_proto_ops(ops: tls_proto_ops[TLSV6],
983 base: sk->sk_socket->ops);
984 smp_store_release(&saved_tcpv6_prot, prot);
985 }
986 mutex_unlock(lock: &tcpv6_prot_mutex);
987 }
988
989 if (ip_ver == TLSV4 &&
990 unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
991 mutex_lock(&tcpv4_prot_mutex);
992 if (likely(prot != saved_tcpv4_prot)) {
993 build_protos(prot: tls_prots[TLSV4], base: prot);
994 build_proto_ops(ops: tls_proto_ops[TLSV4],
995 base: sk->sk_socket->ops);
996 smp_store_release(&saved_tcpv4_prot, prot);
997 }
998 mutex_unlock(lock: &tcpv4_prot_mutex);
999 }
1000}
1001
1002static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
1003 const struct proto *base)
1004{
1005 prot[TLS_BASE][TLS_BASE] = *base;
1006 prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt;
1007 prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt;
1008 prot[TLS_BASE][TLS_BASE].disconnect = tls_disconnect;
1009 prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close;
1010
1011 prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
1012 prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg;
1013 prot[TLS_SW][TLS_BASE].splice_eof = tls_sw_splice_eof;
1014
1015 prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
1016 prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg;
1017 prot[TLS_BASE][TLS_SW].sock_is_readable = tls_sw_sock_is_readable;
1018 prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close;
1019
1020 prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
1021 prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg;
1022 prot[TLS_SW][TLS_SW].sock_is_readable = tls_sw_sock_is_readable;
1023 prot[TLS_SW][TLS_SW].close = tls_sk_proto_close;
1024
1025#ifdef CONFIG_TLS_DEVICE
1026 prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
1027 prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg;
1028 prot[TLS_HW][TLS_BASE].splice_eof = tls_device_splice_eof;
1029
1030 prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
1031 prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg;
1032 prot[TLS_HW][TLS_SW].splice_eof = tls_device_splice_eof;
1033
1034 prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
1035
1036 prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
1037
1038 prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
1039#endif
1040#ifdef CONFIG_TLS_TOE
1041 prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
1042 prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_toe_hash;
1043 prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_toe_unhash;
1044#endif
1045}
1046
1047static int tls_init(struct sock *sk)
1048{
1049 struct tls_context *ctx;
1050 int rc = 0;
1051
1052 tls_build_proto(sk);
1053
1054#ifdef CONFIG_TLS_TOE
1055 if (tls_toe_bypass(sk))
1056 return 0;
1057#endif
1058
1059 /* The TLS ulp is currently supported only for TCP sockets
1060 * in ESTABLISHED state.
1061 * Supporting sockets in LISTEN state will require us
1062 * to modify the accept implementation to clone rather then
1063 * share the ulp context.
1064 */
1065 if (sk->sk_state != TCP_ESTABLISHED)
1066 return -ENOTCONN;
1067
1068 /* allocate tls context */
1069 write_lock_bh(&sk->sk_callback_lock);
1070 ctx = tls_ctx_create(sk);
1071 if (!ctx) {
1072 rc = -ENOMEM;
1073 goto out;
1074 }
1075
1076 ctx->tx_conf = TLS_BASE;
1077 ctx->rx_conf = TLS_BASE;
1078 ctx->tx_max_payload_len = TLS_MAX_PAYLOAD_SIZE;
1079 update_sk_prot(sk, ctx);
1080out:
1081 write_unlock_bh(&sk->sk_callback_lock);
1082 return rc;
1083}
1084
1085static void tls_update(struct sock *sk, struct proto *p,
1086 void (*write_space)(struct sock *sk))
1087{
1088 struct tls_context *ctx;
1089
1090 WARN_ON_ONCE(sk->sk_prot == p);
1091
1092 ctx = tls_get_ctx(sk);
1093 if (likely(ctx)) {
1094 ctx->sk_write_space = write_space;
1095 ctx->sk_proto = p;
1096 } else {
1097 /* Pairs with lockless read in sk_clone_lock(). */
1098 WRITE_ONCE(sk->sk_prot, p);
1099 sk->sk_write_space = write_space;
1100 }
1101}
1102
1103static u16 tls_user_config(struct tls_context *ctx, bool tx)
1104{
1105 u16 config = tx ? ctx->tx_conf : ctx->rx_conf;
1106
1107 switch (config) {
1108 case TLS_BASE:
1109 return TLS_CONF_BASE;
1110 case TLS_SW:
1111 return TLS_CONF_SW;
1112 case TLS_HW:
1113 return TLS_CONF_HW;
1114 case TLS_HW_RECORD:
1115 return TLS_CONF_HW_RECORD;
1116 }
1117 return 0;
1118}
1119
1120static int tls_get_info(struct sock *sk, struct sk_buff *skb, bool net_admin)
1121{
1122 u16 version, cipher_type;
1123 struct tls_context *ctx;
1124 struct nlattr *start;
1125 int err;
1126
1127 start = nla_nest_start_noflag(skb, attrtype: INET_ULP_INFO_TLS);
1128 if (!start)
1129 return -EMSGSIZE;
1130
1131 rcu_read_lock();
1132 ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
1133 if (!ctx) {
1134 err = 0;
1135 goto nla_failure;
1136 }
1137 version = ctx->prot_info.version;
1138 if (version) {
1139 err = nla_put_u16(skb, attrtype: TLS_INFO_VERSION, value: version);
1140 if (err)
1141 goto nla_failure;
1142 }
1143 cipher_type = ctx->prot_info.cipher_type;
1144 if (cipher_type) {
1145 err = nla_put_u16(skb, attrtype: TLS_INFO_CIPHER, value: cipher_type);
1146 if (err)
1147 goto nla_failure;
1148 }
1149 err = nla_put_u16(skb, attrtype: TLS_INFO_TXCONF, value: tls_user_config(ctx, tx: true));
1150 if (err)
1151 goto nla_failure;
1152
1153 err = nla_put_u16(skb, attrtype: TLS_INFO_RXCONF, value: tls_user_config(ctx, tx: false));
1154 if (err)
1155 goto nla_failure;
1156
1157 if (ctx->tx_conf == TLS_HW && ctx->zerocopy_sendfile) {
1158 err = nla_put_flag(skb, attrtype: TLS_INFO_ZC_RO_TX);
1159 if (err)
1160 goto nla_failure;
1161 }
1162 if (ctx->rx_no_pad) {
1163 err = nla_put_flag(skb, attrtype: TLS_INFO_RX_NO_PAD);
1164 if (err)
1165 goto nla_failure;
1166 }
1167
1168 err = nla_put_u16(skb, attrtype: TLS_INFO_TX_MAX_PAYLOAD_LEN,
1169 value: ctx->tx_max_payload_len);
1170
1171 if (err)
1172 goto nla_failure;
1173
1174 rcu_read_unlock();
1175 nla_nest_end(skb, start);
1176 return 0;
1177
1178nla_failure:
1179 rcu_read_unlock();
1180 nla_nest_cancel(skb, start);
1181 return err;
1182}
1183
1184static size_t tls_get_info_size(const struct sock *sk, bool net_admin)
1185{
1186 size_t size = 0;
1187
1188 size += nla_total_size(payload: 0) + /* INET_ULP_INFO_TLS */
1189 nla_total_size(payload: sizeof(u16)) + /* TLS_INFO_VERSION */
1190 nla_total_size(payload: sizeof(u16)) + /* TLS_INFO_CIPHER */
1191 nla_total_size(payload: sizeof(u16)) + /* TLS_INFO_RXCONF */
1192 nla_total_size(payload: sizeof(u16)) + /* TLS_INFO_TXCONF */
1193 nla_total_size(payload: 0) + /* TLS_INFO_ZC_RO_TX */
1194 nla_total_size(payload: 0) + /* TLS_INFO_RX_NO_PAD */
1195 nla_total_size(payload: sizeof(u16)) + /* TLS_INFO_TX_MAX_PAYLOAD_LEN */
1196 0;
1197
1198 return size;
1199}
1200
1201static int __net_init tls_init_net(struct net *net)
1202{
1203 int err;
1204
1205 net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
1206 if (!net->mib.tls_statistics)
1207 return -ENOMEM;
1208
1209 err = tls_proc_init(net);
1210 if (err)
1211 goto err_free_stats;
1212
1213 return 0;
1214err_free_stats:
1215 free_percpu(pdata: net->mib.tls_statistics);
1216 return err;
1217}
1218
1219static void __net_exit tls_exit_net(struct net *net)
1220{
1221 tls_proc_fini(net);
1222 free_percpu(pdata: net->mib.tls_statistics);
1223}
1224
1225static struct pernet_operations tls_proc_ops = {
1226 .init = tls_init_net,
1227 .exit = tls_exit_net,
1228};
1229
1230static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
1231 .name = "tls",
1232 .owner = THIS_MODULE,
1233 .init = tls_init,
1234 .update = tls_update,
1235 .get_info = tls_get_info,
1236 .get_info_size = tls_get_info_size,
1237};
1238
1239static int __init tls_register(void)
1240{
1241 int err;
1242
1243 err = register_pernet_subsys(&tls_proc_ops);
1244 if (err)
1245 return err;
1246
1247 err = tls_strp_dev_init();
1248 if (err)
1249 goto err_pernet;
1250
1251 err = tls_device_init();
1252 if (err)
1253 goto err_strp;
1254
1255 tcp_register_ulp(type: &tcp_tls_ulp_ops);
1256
1257 return 0;
1258err_strp:
1259 tls_strp_dev_exit();
1260err_pernet:
1261 unregister_pernet_subsys(&tls_proc_ops);
1262 return err;
1263}
1264
1265static void __exit tls_unregister(void)
1266{
1267 tcp_unregister_ulp(type: &tcp_tls_ulp_ops);
1268 tls_strp_dev_exit();
1269 tls_device_cleanup();
1270 unregister_pernet_subsys(&tls_proc_ops);
1271}
1272
1273module_init(tls_register);
1274module_exit(tls_unregister);
1275

source code of linux/net/tls/tls_main.c