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netfilter: Avoid assigning 'const' pointer to non-const pointer
[linux-block.git] / net / tls / tls_main.c
CommitLineData
3c4d7559
DW		 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>
dd0bed16 41#include <linux/inetdevice.h>
26811cc9 42#include <linux/inet_diag.h>
3c4d7559 43
d26b698d 44#include <net/snmp.h>
3c4d7559 45#include <net/tls.h>
25a3cd81 46#include <net/tls_toe.h>
3c4d7559
DW		 47
48MODULE_AUTHOR("Mellanox Technologies");
49MODULE_DESCRIPTION("Transport Layer Security Support");
50MODULE_LICENSE("Dual BSD/GPL");
037b0b86 51MODULE_ALIAS_TCP_ULP("tls");
3c4d7559 52
c113187d
BP		 53enum {
54 TLSV4,
55 TLSV6,
56 TLS_NUM_PROTS,
57};
6d88207f 58
c113187d
BP		 59static struct proto *saved_tcpv6_prot;
60static DEFINE_MUTEX(tcpv6_prot_mutex);
28cb6f1e
JF		 61static struct proto *saved_tcpv4_prot;
62static DEFINE_MUTEX(tcpv4_prot_mutex);
f66de3ee 63static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
c46234eb 64static struct proto_ops tls_sw_proto_ops;
63a6b3fe 65static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
f13fe3e6 66 const struct proto *base);
6d88207f 67
08700dab 68void update_sk_prot(struct sock *sk, struct tls_context *ctx)
6d88207f 69{
c113187d
BP		 70 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
71
d5bee737
JS		 72 WRITE_ONCE(sk->sk_prot,
73 &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]);
6d88207f 74}
3c4d7559
DW		 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
c212d2c7 115 ctx->in_tcp_sendpages = true;
3c4d7559
DW		 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;
080324c3 136 ctx->in_tcp_sendpages = false;
3c4d7559
DW		 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
c212d2c7 150 ctx->in_tcp_sendpages = false;
3c4d7559
DW		 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
a42055e8
VG		 200int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
201 int flags)
3c4d7559
DW		 202{
203 struct scatterlist *sg;
204 u16 offset;
205
3c4d7559
DW		 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
c5daa6cc 213void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
35b71a34
JK		 214{
215 struct scatterlist *sg;
216
c5daa6cc 217 for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
35b71a34
JK		 218 put_page(sg_page(sg));
219 sk_mem_uncharge(sk, sg->length);
35b71a34
JK		 220 }
221 ctx->partially_sent_record = NULL;
35b71a34
JK		 222}
223
3c4d7559
DW		 224static void tls_write_space(struct sock *sk)
225{
226 struct tls_context *ctx = tls_get_ctx(sk);
227
67db7cd2
JF		 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);
c212d2c7 234 return;
67db7cd2 235 }
c212d2c7 236
7463d3a2
BP		 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);
4504ab0e
VG		 243
244 ctx->sk_write_space(sk);
3c4d7559
DW		 245}
246
15a7dea7
JK		 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)
86029d10
SD		 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));
79ffe608 262 mutex_destroy(&ctx->tx_lock);
15a7dea7
JK		 263
264 if (sk)
265 kfree_rcu(ctx, rcu);
266 else
267 kfree(ctx);
86029d10
SD		 268}
269
313ab004
JF		 270static void tls_sk_proto_cleanup(struct sock *sk,
271 struct tls_context *ctx, long timeo)
3c4d7559 272{
9354544c
DM		 273 if (unlikely(sk->sk_write_pending) &&
274 !wait_on_pending_writer(sk, &timeo))
3c4d7559
DW		 275 tls_handle_open_record(sk, 0);
276
f66de3ee
BP		 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);
313ab004 281 tls_sw_release_resources_tx(sk);
b32fd3cc 282 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
35b71a34
JK		 283 } else if (ctx->tx_conf == TLS_HW) {
284 tls_device_free_resources_tx(sk);
b32fd3cc 285 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
f66de3ee 286 }
3c4d7559 287
b32fd3cc 288 if (ctx->rx_conf == TLS_SW) {
313ab004 289 tls_sw_release_resources_rx(sk);
b32fd3cc
JK		 290 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
291 } else if (ctx->rx_conf == TLS_HW) {
4799ac81 292 tls_device_offload_cleanup_rx(sk);
b32fd3cc
JK		 293 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
294 }
313ab004
JF		 295}
296
297static void tls_sk_proto_close(struct sock *sk, long timeout)
298{
95fa1454 299 struct inet_connection_sock *icsk = inet_csk(sk);
313ab004
JF		 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;
313ab004
JF		 309
310 if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
311 tls_sk_proto_cleanup(sk, ctx, timeo);
e8f69799 312
95fa1454
JF		 313 write_lock_bh(&sk->sk_callback_lock);
314 if (free_ctx)
15a7dea7 315 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
d5bee737 316 WRITE_ONCE(sk->sk_prot, ctx->sk_proto);
d85f0177
JF		 317 if (sk->sk_write_space == tls_write_space)
318 sk->sk_write_space = ctx->sk_write_space;
95fa1454 319 write_unlock_bh(&sk->sk_callback_lock);
3c4d7559 320 release_sock(sk);
313ab004
JF		 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);
be7bbea1 327 ctx->sk_proto->close(sk, timeout);
313ab004 328
98f0a395 329 if (free_ctx)
15a7dea7 330 tls_ctx_free(sk, ctx);
3c4d7559
DW		 331}
332
333static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
334 int __user *optlen)
335{
336 int rc = 0;
337 struct tls_context *ctx = tls_get_ctx(sk);
338 struct tls_crypto_info *crypto_info;
339 int len;
340
341 if (get_user(len, optlen))
342 return -EFAULT;
343
344 if (!optval || (len < sizeof(*crypto_info))) {
345 rc = -EINVAL;
346 goto out;
347 }
348
349 if (!ctx) {
350 rc = -EBUSY;
351 goto out;
352 }
353
354 /* get user crypto info */
86029d10 355 crypto_info = &ctx->crypto_send.info;
3c4d7559
DW		 356
357 if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
358 rc = -EBUSY;
359 goto out;
360 }
361
5a3b886c 362 if (len == sizeof(*crypto_info)) {
ac55cd61
DC		 363 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
364 rc = -EFAULT;
3c4d7559
DW		 365 goto out;
366 }
367
368 switch (crypto_info->cipher_type) {
369 case TLS_CIPHER_AES_GCM_128: {
370 struct tls12_crypto_info_aes_gcm_128 *
371 crypto_info_aes_gcm_128 =
372 container_of(crypto_info,
373 struct tls12_crypto_info_aes_gcm_128,
374 info);
375
376 if (len != sizeof(*crypto_info_aes_gcm_128)) {
377 rc = -EINVAL;
378 goto out;
379 }
380 lock_sock(sk);
a1dfa681 381 memcpy(crypto_info_aes_gcm_128->iv,
dbe42559 382 ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
3c4d7559 383 TLS_CIPHER_AES_GCM_128_IV_SIZE);
dbe42559 384 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
c410c196 385 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
3c4d7559 386 release_sock(sk);
ac55cd61
DC		 387 if (copy_to_user(optval,
388 crypto_info_aes_gcm_128,
389 sizeof(*crypto_info_aes_gcm_128)))
390 rc = -EFAULT;
3c4d7559
DW		 391 break;
392 }
fb99bce7
DW		 393 case TLS_CIPHER_AES_GCM_256: {
394 struct tls12_crypto_info_aes_gcm_256 *
395 crypto_info_aes_gcm_256 =
396 container_of(crypto_info,
397 struct tls12_crypto_info_aes_gcm_256,
398 info);
399
400 if (len != sizeof(*crypto_info_aes_gcm_256)) {
401 rc = -EINVAL;
402 goto out;
403 }
404 lock_sock(sk);
405 memcpy(crypto_info_aes_gcm_256->iv,
406 ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
407 TLS_CIPHER_AES_GCM_256_IV_SIZE);
408 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq,
409 TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
410 release_sock(sk);
411 if (copy_to_user(optval,
412 crypto_info_aes_gcm_256,
413 sizeof(*crypto_info_aes_gcm_256)))
414 rc = -EFAULT;
415 break;
416 }
3c4d7559
DW		 417 default:
418 rc = -EINVAL;
419 }
420
421out:
422 return rc;
423}
424
425static int do_tls_getsockopt(struct sock *sk, int optname,
426 char __user *optval, int __user *optlen)
427{
428 int rc = 0;
429
430 switch (optname) {
431 case TLS_TX:
432 rc = do_tls_getsockopt_tx(sk, optval, optlen);
433 break;
434 default:
435 rc = -ENOPROTOOPT;
436 break;
437 }
438 return rc;
439}
440
441static int tls_getsockopt(struct sock *sk, int level, int optname,
442 char __user *optval, int __user *optlen)
443{
444 struct tls_context *ctx = tls_get_ctx(sk);
445
446 if (level != SOL_TLS)
be7bbea1
JK		 447 return ctx->sk_proto->getsockopt(sk, level,
448 optname, optval, optlen);
3c4d7559
DW		 449
450 return do_tls_getsockopt(sk, optname, optval, optlen);
451}
452
c46234eb
DW		 453static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
454 unsigned int optlen, int tx)
3c4d7559 455{
196c31b4 456 struct tls_crypto_info *crypto_info;
4509de14 457 struct tls_crypto_info *alt_crypto_info;
3c4d7559 458 struct tls_context *ctx = tls_get_ctx(sk);
fb99bce7 459 size_t optsize;
3c4d7559 460 int rc = 0;
58371585 461 int conf;
3c4d7559
DW		 462
463 if (!optval || (optlen < sizeof(*crypto_info))) {
464 rc = -EINVAL;
465 goto out;
466 }
467
4509de14 468 if (tx) {
86029d10 469 crypto_info = &ctx->crypto_send.info;
4509de14
VG		 470 alt_crypto_info = &ctx->crypto_recv.info;
471 } else {
86029d10 472 crypto_info = &ctx->crypto_recv.info;
4509de14
VG		 473 alt_crypto_info = &ctx->crypto_send.info;
474 }
c46234eb 475
196c31b4 476 /* Currently we don't support set crypto info more than one time */
877d17c7
SD		 477 if (TLS_CRYPTO_INFO_READY(crypto_info)) {
478 rc = -EBUSY;
196c31b4 479 goto out;
877d17c7 480 }
196c31b4
IL		 481
482 rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
3c4d7559
DW		 483 if (rc) {
484 rc = -EFAULT;
257082e6 485 goto err_crypto_info;
3c4d7559
DW		 486 }
487
488 /* check version */
130b392c
DW		 489 if (crypto_info->version != TLS_1_2_VERSION &&
490 crypto_info->version != TLS_1_3_VERSION) {
4a5cdc60 491 rc = -EINVAL;
196c31b4 492 goto err_crypto_info;
3c4d7559
DW		 493 }
494
4509de14
VG		 495 /* Ensure that TLS version and ciphers are same in both directions */
496 if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
497 if (alt_crypto_info->version != crypto_info->version ||
498 alt_crypto_info->cipher_type != crypto_info->cipher_type) {
499 rc = -EINVAL;
500 goto err_crypto_info;
501 }
502 }
503
196c31b4 504 switch (crypto_info->cipher_type) {
fb99bce7 505 case TLS_CIPHER_AES_GCM_128:
f295b3ae
VG		 506 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
507 break;
fb99bce7 508 case TLS_CIPHER_AES_GCM_256: {
f295b3ae 509 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
3c4d7559
DW		 510 break;
511 }
f295b3ae
VG		 512 case TLS_CIPHER_AES_CCM_128:
513 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
514 break;
3c4d7559
DW		 515 default:
516 rc = -EINVAL;
6db959c8 517 goto err_crypto_info;
3c4d7559
DW		 518 }
519
f295b3ae
VG		 520 if (optlen != optsize) {
521 rc = -EINVAL;
522 goto err_crypto_info;
523 }
524
525 rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
526 optlen - sizeof(*crypto_info));
527 if (rc) {
528 rc = -EFAULT;
529 goto err_crypto_info;
530 }
531
c46234eb 532 if (tx) {
e8f69799
IL		 533 rc = tls_set_device_offload(sk, ctx);
534 conf = TLS_HW;
b32fd3cc
JK		 535 if (!rc) {
536 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
537 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
538 } else {
e8f69799 539 rc = tls_set_sw_offload(sk, ctx, 1);
318892ac
JK		 540 if (rc)
541 goto err_crypto_info;
b32fd3cc
JK		 542 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
543 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
e8f69799
IL		 544 conf = TLS_SW;
545 }
c46234eb 546 } else {
4799ac81
BP		 547 rc = tls_set_device_offload_rx(sk, ctx);
548 conf = TLS_HW;
b32fd3cc
JK		 549 if (!rc) {
550 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
551 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
552 } else {
4799ac81 553 rc = tls_set_sw_offload(sk, ctx, 0);
318892ac
JK		 554 if (rc)
555 goto err_crypto_info;
b32fd3cc
JK		 556 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
557 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
4799ac81
BP		 558 conf = TLS_SW;
559 }
313ab004 560 tls_sw_strparser_arm(sk, ctx);
c46234eb
DW		 561 }
562
f66de3ee
BP		 563 if (tx)
564 ctx->tx_conf = conf;
565 else
566 ctx->rx_conf = conf;
6d88207f 567 update_sk_prot(sk, ctx);
c46234eb
DW		 568 if (tx) {
569 ctx->sk_write_space = sk->sk_write_space;
570 sk->sk_write_space = tls_write_space;
571 } else {
572 sk->sk_socket->ops = &tls_sw_proto_ops;
573 }
3c4d7559
DW		 574 goto out;
575
576err_crypto_info:
c844eb46 577 memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
3c4d7559
DW		 578out:
579 return rc;
580}
581
582static int do_tls_setsockopt(struct sock *sk, int optname,
583 char __user *optval, unsigned int optlen)
584{
585 int rc = 0;
586
587 switch (optname) {
588 case TLS_TX:
c46234eb 589 case TLS_RX:
3c4d7559 590 lock_sock(sk);
c46234eb
DW		 591 rc = do_tls_setsockopt_conf(sk, optval, optlen,
592 optname == TLS_TX);
3c4d7559
DW		 593 release_sock(sk);
594 break;
595 default:
596 rc = -ENOPROTOOPT;
597 break;
598 }
599 return rc;
600}
601
602static int tls_setsockopt(struct sock *sk, int level, int optname,
603 char __user *optval, unsigned int optlen)
604{
605 struct tls_context *ctx = tls_get_ctx(sk);
606
607 if (level != SOL_TLS)
be7bbea1
JK		 608 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
609 optlen);
3c4d7559
DW		 610
611 return do_tls_setsockopt(sk, optname, optval, optlen);
612}
613
08700dab 614struct tls_context *tls_ctx_create(struct sock *sk)
dd0bed16
AG		 615{
616 struct inet_connection_sock *icsk = inet_csk(sk);
617 struct tls_context *ctx;
618
c6ec179a 619 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
dd0bed16
AG		 620 if (!ctx)
621 return NULL;
622
79ffe608 623 mutex_init(&ctx->tx_lock);
15a7dea7 624 rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
d5bee737 625 ctx->sk_proto = READ_ONCE(sk->sk_prot);
dd0bed16
AG		 626 return ctx;
627}
628
63a6b3fe
AG		 629static void tls_build_proto(struct sock *sk)
630{
631 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
d5bee737 632 const struct proto *prot = READ_ONCE(sk->sk_prot);
63a6b3fe
AG		 633
634 /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
635 if (ip_ver == TLSV6 &&
5bb4c45d 636 unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
63a6b3fe 637 mutex_lock(&tcpv6_prot_mutex);
5bb4c45d
JS		 638 if (likely(prot != saved_tcpv6_prot)) {
639 build_protos(tls_prots[TLSV6], prot);
640 smp_store_release(&saved_tcpv6_prot, prot);
63a6b3fe
AG		 641 }
642 mutex_unlock(&tcpv6_prot_mutex);
643 }
644
645 if (ip_ver == TLSV4 &&
5bb4c45d 646 unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
63a6b3fe 647 mutex_lock(&tcpv4_prot_mutex);
5bb4c45d
JS		 648 if (likely(prot != saved_tcpv4_prot)) {
649 build_protos(tls_prots[TLSV4], prot);
650 smp_store_release(&saved_tcpv4_prot, prot);
63a6b3fe
AG		 651 }
652 mutex_unlock(&tcpv4_prot_mutex);
653 }
654}
655
f66de3ee 656static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
f13fe3e6 657 const struct proto *base)
c113187d 658{
f66de3ee
BP		 659 prot[TLS_BASE][TLS_BASE] = *base;
660 prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt;
661 prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt;
662 prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close;
663
664 prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
665 prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg;
666 prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage;
667
668 prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
924ad65e
JF		 669 prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg;
670 prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read;
671 prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close;
f66de3ee
BP		 672
673 prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
924ad65e
JF		 674 prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg;
675 prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read;
676 prot[TLS_SW][TLS_SW].close = tls_sk_proto_close;
f66de3ee 677
e8f69799
IL		 678#ifdef CONFIG_TLS_DEVICE
679 prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
680 prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg;
681 prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage;
682
683 prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
684 prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg;
685 prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage;
4799ac81
BP		 686
687 prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
688
689 prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
690
691 prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
e8f69799 692#endif
53b4414a 693#ifdef CONFIG_TLS_TOE
f66de3ee 694 prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
0eb8745e
JK		 695 prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_toe_hash;
696 prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_toe_unhash;
53b4414a 697#endif
c113187d
BP		 698}
699
3c4d7559
DW		 700static int tls_init(struct sock *sk)
701{
3c4d7559
DW		 702 struct tls_context *ctx;
703 int rc = 0;
704
16bed0e6
JK		 705 tls_build_proto(sk);
706
53b4414a 707#ifdef CONFIG_TLS_TOE
0eb8745e 708 if (tls_toe_bypass(sk))
95fa1454 709 return 0;
53b4414a 710#endif
dd0bed16 711
d91c3e17
IL		 712 /* The TLS ulp is currently supported only for TCP sockets
713 * in ESTABLISHED state.
714 * Supporting sockets in LISTEN state will require us
715 * to modify the accept implementation to clone rather then
716 * share the ulp context.
717 */
718 if (sk->sk_state != TCP_ESTABLISHED)
4a5cdc60 719 return -ENOTCONN;
d91c3e17 720
3c4d7559 721 /* allocate tls context */
95fa1454 722 write_lock_bh(&sk->sk_callback_lock);
08700dab 723 ctx = tls_ctx_create(sk);
3c4d7559
DW		 724 if (!ctx) {
725 rc = -ENOMEM;
726 goto out;
727 }
6d88207f 728
f66de3ee
BP		 729 ctx->tx_conf = TLS_BASE;
730 ctx->rx_conf = TLS_BASE;
6d88207f 731 update_sk_prot(sk, ctx);
3c4d7559 732out:
95fa1454 733 write_unlock_bh(&sk->sk_callback_lock);
3c4d7559
DW		 734 return rc;
735}
736
33bfe20d
JF		 737static void tls_update(struct sock *sk, struct proto *p,
738 void (*write_space)(struct sock *sk))
95fa1454
JF		 739{
740 struct tls_context *ctx;
741
742 ctx = tls_get_ctx(sk);
33bfe20d
JF		 743 if (likely(ctx)) {
744 ctx->sk_write_space = write_space;
95fa1454 745 ctx->sk_proto = p;
33bfe20d 746 } else {
b8e202d1
JS		 747 /* Pairs with lockless read in sk_clone_lock(). */
748 WRITE_ONCE(sk->sk_prot, p);
33bfe20d
JF		 749 sk->sk_write_space = write_space;
750 }
95fa1454
JF		 751}
752
26811cc9
DC		 753static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
754{
755 u16 version, cipher_type;
756 struct tls_context *ctx;
757 struct nlattr *start;
758 int err;
759
760 start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
761 if (!start)
762 return -EMSGSIZE;
763
764 rcu_read_lock();
765 ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
766 if (!ctx) {
767 err = 0;
768 goto nla_failure;
769 }
770 version = ctx->prot_info.version;
771 if (version) {
772 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
773 if (err)
774 goto nla_failure;
775 }
776 cipher_type = ctx->prot_info.cipher_type;
777 if (cipher_type) {
778 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
779 if (err)
780 goto nla_failure;
781 }
782 err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
783 if (err)
784 goto nla_failure;
785
786 err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
787 if (err)
788 goto nla_failure;
789
790 rcu_read_unlock();
791 nla_nest_end(skb, start);
792 return 0;
793
794nla_failure:
795 rcu_read_unlock();
796 nla_nest_cancel(skb, start);
797 return err;
798}
799
800static size_t tls_get_info_size(const struct sock *sk)
801{
802 size_t size = 0;
803
804 size += nla_total_size(0) + /* INET_ULP_INFO_TLS */
805 nla_total_size(sizeof(u16)) + /* TLS_INFO_VERSION */
806 nla_total_size(sizeof(u16)) + /* TLS_INFO_CIPHER */
807 nla_total_size(sizeof(u16)) + /* TLS_INFO_RXCONF */
808 nla_total_size(sizeof(u16)) + /* TLS_INFO_TXCONF */
809 0;
810
811 return size;
812}
813
d26b698d
JK		 814static int __net_init tls_init_net(struct net *net)
815{
816 int err;
817
818 net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
819 if (!net->mib.tls_statistics)
820 return -ENOMEM;
821
822 err = tls_proc_init(net);
823 if (err)
824 goto err_free_stats;
825
826 return 0;
827err_free_stats:
828 free_percpu(net->mib.tls_statistics);
829 return err;
830}
831
832static void __net_exit tls_exit_net(struct net *net)
833{
834 tls_proc_fini(net);
835 free_percpu(net->mib.tls_statistics);
836}
837
838static struct pernet_operations tls_proc_ops = {
839 .init = tls_init_net,
840 .exit = tls_exit_net,
841};
842
3c4d7559
DW		 843static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
844 .name = "tls",
845 .owner = THIS_MODULE,
846 .init = tls_init,
95fa1454 847 .update = tls_update,
26811cc9
DC		 848 .get_info = tls_get_info,
849 .get_info_size = tls_get_info_size,
3c4d7559
DW		 850};
851
852static int __init tls_register(void)
853{
d26b698d
JK		 854 int err;
855
856 err = register_pernet_subsys(&tls_proc_ops);
857 if (err)
858 return err;
859
c46234eb 860 tls_sw_proto_ops = inet_stream_ops;
c46234eb 861 tls_sw_proto_ops.splice_read = tls_sw_splice_read;
d4ffb02d 862 tls_sw_proto_ops.sendpage_locked = tls_sw_sendpage_locked,
c46234eb 863
e8f69799 864 tls_device_init();
3c4d7559
DW		 865 tcp_register_ulp(&tcp_tls_ulp_ops);
866
867 return 0;
868}
869
870static void __exit tls_unregister(void)
871{
872 tcp_unregister_ulp(&tcp_tls_ulp_ops);
e8f69799 873 tls_device_cleanup();
d26b698d 874 unregister_pernet_subsys(&tls_proc_ops);
3c4d7559
DW		 875}
876
877module_init(tls_register);
878module_exit(tls_unregister);
Linux 6.x block layer and io_uring tree(s)