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Merge tag 'md/4.19-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md
[linux-2.6/btrfs-unstable.git] / net / tls / tls_device.c
blob292742e50bfa4b3a540cbaa3eb2b07400e7141be
1 /* Copyright (c) 2018, Mellanox Technologies All rights reserved.
2 *
3 * This software is available to you under a choice of one of two
4 * licenses. You may choose to be licensed under the terms of the GNU
5 * General Public License (GPL) Version 2, available from the file
6 * COPYING in the main directory of this source tree, or the
7 * OpenIB.org BSD license below:
8 *
9 * Redistribution and use in source and binary forms, with or
10 * without modification, are permitted provided that the following
11 * conditions are met:
12 *
13 * - Redistributions of source code must retain the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer.
16 *
17 * - Redistributions in binary form must reproduce the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer in the documentation and/or other materials
20 * provided with the distribution.
21 *
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
26 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
27 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
28 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
29 * SOFTWARE.
30 */
31
32 #include <crypto/aead.h>
33 #include <linux/highmem.h>
34 #include <linux/module.h>
35 #include <linux/netdevice.h>
36 #include <net/dst.h>
37 #include <net/inet_connection_sock.h>
38 #include <net/tcp.h>
39 #include <net/tls.h>
40
41 /* device_offload_lock is used to synchronize tls_dev_add
42 * against NETDEV_DOWN notifications.
43 */
44 static DECLARE_RWSEM(device_offload_lock);
45
46 static void tls_device_gc_task(struct work_struct *work);
47
48 static DECLARE_WORK(tls_device_gc_work, tls_device_gc_task);
49 static LIST_HEAD(tls_device_gc_list);
50 static LIST_HEAD(tls_device_list);
51 static DEFINE_SPINLOCK(tls_device_lock);
52
53 static void tls_device_free_ctx(struct tls_context *ctx)
54 {
55 if (ctx->tx_conf == TLS_HW)
56 kfree(tls_offload_ctx_tx(ctx));
57
58 if (ctx->rx_conf == TLS_HW)
59 kfree(tls_offload_ctx_rx(ctx));
60
61 kfree(ctx);
62 }
63
64 static void tls_device_gc_task(struct work_struct *work)
65 {
66 struct tls_context *ctx, *tmp;
67 unsigned long flags;
68 LIST_HEAD(gc_list);
69
70 spin_lock_irqsave(&tls_device_lock, flags);
71 list_splice_init(&tls_device_gc_list, &gc_list);
72 spin_unlock_irqrestore(&tls_device_lock, flags);
73
74 list_for_each_entry_safe(ctx, tmp, &gc_list, list) {
75 struct net_device *netdev = ctx->netdev;
76
77 if (netdev && ctx->tx_conf == TLS_HW) {
78 netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
79 TLS_OFFLOAD_CTX_DIR_TX);
80 dev_put(netdev);
81 ctx->netdev = NULL;
82 }
83
84 list_del(&ctx->list);
85 tls_device_free_ctx(ctx);
86 }
87 }
88
89 static void tls_device_attach(struct tls_context *ctx, struct sock *sk,
90 struct net_device *netdev)
91 {
92 if (sk->sk_destruct != tls_device_sk_destruct) {
93 refcount_set(&ctx->refcount, 1);
94 dev_hold(netdev);
95 ctx->netdev = netdev;
96 spin_lock_irq(&tls_device_lock);
97 list_add_tail(&ctx->list, &tls_device_list);
98 spin_unlock_irq(&tls_device_lock);
99
100 ctx->sk_destruct = sk->sk_destruct;
101 sk->sk_destruct = tls_device_sk_destruct;
102 }
103 }
104
105 static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
106 {
107 unsigned long flags;
108
109 spin_lock_irqsave(&tls_device_lock, flags);
110 list_move_tail(&ctx->list, &tls_device_gc_list);
111
112 /* schedule_work inside the spinlock
113 * to make sure tls_device_down waits for that work.
114 */
115 schedule_work(&tls_device_gc_work);
116
117 spin_unlock_irqrestore(&tls_device_lock, flags);
118 }
119
120 /* We assume that the socket is already connected */
121 static struct net_device *get_netdev_for_sock(struct sock *sk)
122 {
123 struct dst_entry *dst = sk_dst_get(sk);
124 struct net_device *netdev = NULL;
125
126 if (likely(dst)) {
127 netdev = dst->dev;
128 dev_hold(netdev);
129 }
130
131 dst_release(dst);
132
133 return netdev;
134 }
135
136 static void destroy_record(struct tls_record_info *record)
137 {
138 int nr_frags = record->num_frags;
139 skb_frag_t *frag;
140
141 while (nr_frags-- > 0) {
142 frag = &record->frags[nr_frags];
143 __skb_frag_unref(frag);
144 }
145 kfree(record);
146 }
147
148 static void delete_all_records(struct tls_offload_context_tx *offload_ctx)
149 {
150 struct tls_record_info *info, *temp;
151
152 list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) {
153 list_del(&info->list);
154 destroy_record(info);
155 }
156
157 offload_ctx->retransmit_hint = NULL;
158 }
159
160 static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq)
161 {
162 struct tls_context *tls_ctx = tls_get_ctx(sk);
163 struct tls_record_info *info, *temp;
164 struct tls_offload_context_tx *ctx;
165 u64 deleted_records = 0;
166 unsigned long flags;
167
168 if (!tls_ctx)
169 return;
170
171 ctx = tls_offload_ctx_tx(tls_ctx);
172
173 spin_lock_irqsave(&ctx->lock, flags);
174 info = ctx->retransmit_hint;
175 if (info && !before(acked_seq, info->end_seq)) {
176 ctx->retransmit_hint = NULL;
177 list_del(&info->list);
178 destroy_record(info);
179 deleted_records++;
180 }
181
182 list_for_each_entry_safe(info, temp, &ctx->records_list, list) {
183 if (before(acked_seq, info->end_seq))
184 break;
185 list_del(&info->list);
186
187 destroy_record(info);
188 deleted_records++;
189 }
190
191 ctx->unacked_record_sn += deleted_records;
192 spin_unlock_irqrestore(&ctx->lock, flags);
193 }
194
195 /* At this point, there should be no references on this
196 * socket and no in-flight SKBs associated with this
197 * socket, so it is safe to free all the resources.
198 */
199 void tls_device_sk_destruct(struct sock *sk)
200 {
201 struct tls_context *tls_ctx = tls_get_ctx(sk);
202 struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
203
204 tls_ctx->sk_destruct(sk);
205
206 if (tls_ctx->tx_conf == TLS_HW) {
207 if (ctx->open_record)
208 destroy_record(ctx->open_record);
209 delete_all_records(ctx);
210 crypto_free_aead(ctx->aead_send);
211 clean_acked_data_disable(inet_csk(sk));
212 }
213
214 if (refcount_dec_and_test(&tls_ctx->refcount))
215 tls_device_queue_ctx_destruction(tls_ctx);
216 }
217 EXPORT_SYMBOL(tls_device_sk_destruct);
218
219 static void tls_append_frag(struct tls_record_info *record,
220 struct page_frag *pfrag,
221 int size)
222 {
223 skb_frag_t *frag;
224
225 frag = &record->frags[record->num_frags - 1];
226 if (frag->page.p == pfrag->page &&
227 frag->page_offset + frag->size == pfrag->offset) {
228 frag->size += size;
229 } else {
230 ++frag;
231 frag->page.p = pfrag->page;
232 frag->page_offset = pfrag->offset;
233 frag->size = size;
234 ++record->num_frags;
235 get_page(pfrag->page);
236 }
237
238 pfrag->offset += size;
239 record->len += size;
240 }
241
242 static int tls_push_record(struct sock *sk,
243 struct tls_context *ctx,
244 struct tls_offload_context_tx *offload_ctx,
245 struct tls_record_info *record,
246 struct page_frag *pfrag,
247 int flags,
248 unsigned char record_type)
249 {
250 struct tcp_sock *tp = tcp_sk(sk);
251 struct page_frag dummy_tag_frag;
252 skb_frag_t *frag;
253 int i;
254
255 /* fill prepend */
256 frag = &record->frags[0];
257 tls_fill_prepend(ctx,
258 skb_frag_address(frag),
259 record->len - ctx->tx.prepend_size,
260 record_type);
261
262 /* HW doesn't care about the data in the tag, because it fills it. */
263 dummy_tag_frag.page = skb_frag_page(frag);
264 dummy_tag_frag.offset = 0;
265
266 tls_append_frag(record, &dummy_tag_frag, ctx->tx.tag_size);
267 record->end_seq = tp->write_seq + record->len;
268 spin_lock_irq(&offload_ctx->lock);
269 list_add_tail(&record->list, &offload_ctx->records_list);
270 spin_unlock_irq(&offload_ctx->lock);
271 offload_ctx->open_record = NULL;
272 set_bit(TLS_PENDING_CLOSED_RECORD, &ctx->flags);
273 tls_advance_record_sn(sk, &ctx->tx);
274
275 for (i = 0; i < record->num_frags; i++) {
276 frag = &record->frags[i];
277 sg_unmark_end(&offload_ctx->sg_tx_data[i]);
278 sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag),
279 frag->size, frag->page_offset);
280 sk_mem_charge(sk, frag->size);
281 get_page(skb_frag_page(frag));
282 }
283 sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]);
284
285 /* all ready, send */
286 return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags);
287 }
288
289 static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx,
290 struct page_frag *pfrag,
291 size_t prepend_size)
292 {
293 struct tls_record_info *record;
294 skb_frag_t *frag;
295
296 record = kmalloc(sizeof(*record), GFP_KERNEL);
297 if (!record)
298 return -ENOMEM;
299
300 frag = &record->frags[0];
301 __skb_frag_set_page(frag, pfrag->page);
302 frag->page_offset = pfrag->offset;
303 skb_frag_size_set(frag, prepend_size);
304
305 get_page(pfrag->page);
306 pfrag->offset += prepend_size;
307
308 record->num_frags = 1;
309 record->len = prepend_size;
310 offload_ctx->open_record = record;
311 return 0;
312 }
313
314 static int tls_do_allocation(struct sock *sk,
315 struct tls_offload_context_tx *offload_ctx,
316 struct page_frag *pfrag,
317 size_t prepend_size)
318 {
319 int ret;
320
321 if (!offload_ctx->open_record) {
322 if (unlikely(!skb_page_frag_refill(prepend_size, pfrag,
323 sk->sk_allocation))) {
324 sk->sk_prot->enter_memory_pressure(sk);
325 sk_stream_moderate_sndbuf(sk);
326 return -ENOMEM;
327 }
328
329 ret = tls_create_new_record(offload_ctx, pfrag, prepend_size);
330 if (ret)
331 return ret;
332
333 if (pfrag->size > pfrag->offset)
334 return 0;
335 }
336
337 if (!sk_page_frag_refill(sk, pfrag))
338 return -ENOMEM;
339
340 return 0;
341 }
342
343 static int tls_push_data(struct sock *sk,
344 struct iov_iter *msg_iter,
345 size_t size, int flags,
346 unsigned char record_type)
347 {
348 struct tls_context *tls_ctx = tls_get_ctx(sk);
349 struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
350 int tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST;
351 int more = flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE);
352 struct tls_record_info *record = ctx->open_record;
353 struct page_frag *pfrag;
354 size_t orig_size = size;
355 u32 max_open_record_len;
356 int copy, rc = 0;
357 bool done = false;
358 long timeo;
359
360 if (flags &
361 ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST))
362 return -ENOTSUPP;
363
364 if (sk->sk_err)
365 return -sk->sk_err;
366
367 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
368 rc = tls_complete_pending_work(sk, tls_ctx, flags, &timeo);
369 if (rc < 0)
370 return rc;
371
372 pfrag = sk_page_frag(sk);
373
374 /* TLS_HEADER_SIZE is not counted as part of the TLS record, and
375 * we need to leave room for an authentication tag.
376 */
377 max_open_record_len = TLS_MAX_PAYLOAD_SIZE +
378 tls_ctx->tx.prepend_size;
379 do {
380 rc = tls_do_allocation(sk, ctx, pfrag,
381 tls_ctx->tx.prepend_size);
382 if (rc) {
383 rc = sk_stream_wait_memory(sk, &timeo);
384 if (!rc)
385 continue;
386
387 record = ctx->open_record;
388 if (!record)
389 break;
390 handle_error:
391 if (record_type != TLS_RECORD_TYPE_DATA) {
392 /* avoid sending partial
393 * record with type !=
394 * application_data
395 */
396 size = orig_size;
397 destroy_record(record);
398 ctx->open_record = NULL;
399 } else if (record->len > tls_ctx->tx.prepend_size) {
400 goto last_record;
401 }
402
403 break;
404 }
405
406 record = ctx->open_record;
407 copy = min_t(size_t, size, (pfrag->size - pfrag->offset));
408 copy = min_t(size_t, copy, (max_open_record_len - record->len));
409
410 if (copy_from_iter_nocache(page_address(pfrag->page) +
411 pfrag->offset,
412 copy, msg_iter) != copy) {
413 rc = -EFAULT;
414 goto handle_error;
415 }
416 tls_append_frag(record, pfrag, copy);
417
418 size -= copy;
419 if (!size) {
420 last_record:
421 tls_push_record_flags = flags;
422 if (more) {
423 tls_ctx->pending_open_record_frags =
424 record->num_frags;
425 break;
426 }
427
428 done = true;
429 }
430
431 if (done || record->len >= max_open_record_len ||
432 (record->num_frags >= MAX_SKB_FRAGS - 1)) {
433 rc = tls_push_record(sk,
434 tls_ctx,
435 ctx,
436 record,
437 pfrag,
438 tls_push_record_flags,
439 record_type);
440 if (rc < 0)
441 break;
442 }
443 } while (!done);
444
445 if (orig_size - size > 0)
446 rc = orig_size - size;
447
448 return rc;
449 }
450
451 int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
452 {
453 unsigned char record_type = TLS_RECORD_TYPE_DATA;
454 int rc;
455
456 lock_sock(sk);
457
458 if (unlikely(msg->msg_controllen)) {
459 rc = tls_proccess_cmsg(sk, msg, &record_type);
460 if (rc)
461 goto out;
462 }
463
464 rc = tls_push_data(sk, &msg->msg_iter, size,
465 msg->msg_flags, record_type);
466
467 out:
468 release_sock(sk);
469 return rc;
470 }
471
472 int tls_device_sendpage(struct sock *sk, struct page *page,
473 int offset, size_t size, int flags)
474 {
475 struct iov_iter msg_iter;
476 char *kaddr = kmap(page);
477 struct kvec iov;
478 int rc;
479
480 if (flags & MSG_SENDPAGE_NOTLAST)
481 flags |= MSG_MORE;
482
483 lock_sock(sk);
484
485 if (flags & MSG_OOB) {
486 rc = -ENOTSUPP;
487 goto out;
488 }
489
490 iov.iov_base = kaddr + offset;
491 iov.iov_len = size;
492 iov_iter_kvec(&msg_iter, WRITE | ITER_KVEC, &iov, 1, size);
493 rc = tls_push_data(sk, &msg_iter, size,
494 flags, TLS_RECORD_TYPE_DATA);
495 kunmap(page);
496
497 out:
498 release_sock(sk);
499 return rc;
500 }
501
502 struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
503 u32 seq, u64 *p_record_sn)
504 {
505 u64 record_sn = context->hint_record_sn;
506 struct tls_record_info *info;
507
508 info = context->retransmit_hint;
509 if (!info ||
510 before(seq, info->end_seq - info->len)) {
511 /* if retransmit_hint is irrelevant start
512 * from the beggining of the list
513 */
514 info = list_first_entry(&context->records_list,
515 struct tls_record_info, list);
516 record_sn = context->unacked_record_sn;
517 }
518
519 list_for_each_entry_from(info, &context->records_list, list) {
520 if (before(seq, info->end_seq)) {
521 if (!context->retransmit_hint ||
522 after(info->end_seq,
523 context->retransmit_hint->end_seq)) {
524 context->hint_record_sn = record_sn;
525 context->retransmit_hint = info;
526 }
527 *p_record_sn = record_sn;
528 return info;
529 }
530 record_sn++;
531 }
532
533 return NULL;
534 }
535 EXPORT_SYMBOL(tls_get_record);
536
537 static int tls_device_push_pending_record(struct sock *sk, int flags)
538 {
539 struct iov_iter msg_iter;
540
541 iov_iter_kvec(&msg_iter, WRITE | ITER_KVEC, NULL, 0, 0);
542 return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA);
543 }
544
545 void handle_device_resync(struct sock *sk, u32 seq, u64 rcd_sn)
546 {
547 struct tls_context *tls_ctx = tls_get_ctx(sk);
548 struct net_device *netdev = tls_ctx->netdev;
549 struct tls_offload_context_rx *rx_ctx;
550 u32 is_req_pending;
551 s64 resync_req;
552 u32 req_seq;
553
554 if (tls_ctx->rx_conf != TLS_HW)
555 return;
556
557 rx_ctx = tls_offload_ctx_rx(tls_ctx);
558 resync_req = atomic64_read(&rx_ctx->resync_req);
559 req_seq = ntohl(resync_req >> 32) - ((u32)TLS_HEADER_SIZE - 1);
560 is_req_pending = resync_req;
561
562 if (unlikely(is_req_pending) && req_seq == seq &&
563 atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0))
564 netdev->tlsdev_ops->tls_dev_resync_rx(netdev, sk,
565 seq + TLS_HEADER_SIZE - 1,
566 rcd_sn);
567 }
568
569 static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb)
570 {
571 struct strp_msg *rxm = strp_msg(skb);
572 int err = 0, offset = rxm->offset, copy, nsg;
573 struct sk_buff *skb_iter, *unused;
574 struct scatterlist sg[1];
575 char *orig_buf, *buf;
576
577 orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE +
578 TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation);
579 if (!orig_buf)
580 return -ENOMEM;
581 buf = orig_buf;
582
583 nsg = skb_cow_data(skb, 0, &unused);
584 if (unlikely(nsg < 0)) {
585 err = nsg;
586 goto free_buf;
587 }
588
589 sg_init_table(sg, 1);
590 sg_set_buf(&sg[0], buf,
591 rxm->full_len + TLS_HEADER_SIZE +
592 TLS_CIPHER_AES_GCM_128_IV_SIZE);
593 skb_copy_bits(skb, offset, buf,
594 TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE);
595
596 /* We are interested only in the decrypted data not the auth */
597 err = decrypt_skb(sk, skb, sg);
598 if (err != -EBADMSG)
599 goto free_buf;
600 else
601 err = 0;
602
603 copy = min_t(int, skb_pagelen(skb) - offset,
604 rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE);
605
606 if (skb->decrypted)
607 skb_store_bits(skb, offset, buf, copy);
608
609 offset += copy;
610 buf += copy;
611
612 skb_walk_frags(skb, skb_iter) {
613 copy = min_t(int, skb_iter->len,
614 rxm->full_len - offset + rxm->offset -
615 TLS_CIPHER_AES_GCM_128_TAG_SIZE);
616
617 if (skb_iter->decrypted)
618 skb_store_bits(skb_iter, offset, buf, copy);
619
620 offset += copy;
621 buf += copy;
622 }
623
624 free_buf:
625 kfree(orig_buf);
626 return err;
627 }
628
629 int tls_device_decrypted(struct sock *sk, struct sk_buff *skb)
630 {
631 struct tls_context *tls_ctx = tls_get_ctx(sk);
632 struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx);
633 int is_decrypted = skb->decrypted;
634 int is_encrypted = !is_decrypted;
635 struct sk_buff *skb_iter;
636
637 /* Skip if it is already decrypted */
638 if (ctx->sw.decrypted)
639 return 0;
640
641 /* Check if all the data is decrypted already */
642 skb_walk_frags(skb, skb_iter) {
643 is_decrypted &= skb_iter->decrypted;
644 is_encrypted &= !skb_iter->decrypted;
645 }
646
647 ctx->sw.decrypted |= is_decrypted;
648
649 /* Return immedeatly if the record is either entirely plaintext or
650 * entirely ciphertext. Otherwise handle reencrypt partially decrypted
651 * record.
652 */
653 return (is_encrypted || is_decrypted) ? 0 :
654 tls_device_reencrypt(sk, skb);
655 }
656
657 int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
658 {
659 u16 nonce_size, tag_size, iv_size, rec_seq_size;
660 struct tls_record_info *start_marker_record;
661 struct tls_offload_context_tx *offload_ctx;
662 struct tls_crypto_info *crypto_info;
663 struct net_device *netdev;
664 char *iv, *rec_seq;
665 struct sk_buff *skb;
666 int rc = -EINVAL;
667 __be64 rcd_sn;
668
669 if (!ctx)
670 goto out;
671
672 if (ctx->priv_ctx_tx) {
673 rc = -EEXIST;
674 goto out;
675 }
676
677 start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL);
678 if (!start_marker_record) {
679 rc = -ENOMEM;
680 goto out;
681 }
682
683 offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL);
684 if (!offload_ctx) {
685 rc = -ENOMEM;
686 goto free_marker_record;
687 }
688
689 crypto_info = &ctx->crypto_send;
690 switch (crypto_info->cipher_type) {
691 case TLS_CIPHER_AES_GCM_128:
692 nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
693 tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE;
694 iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
695 iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv;
696 rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE;
697 rec_seq =
698 ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq;
699 break;
700 default:
701 rc = -EINVAL;
702 goto free_offload_ctx;
703 }
704
705 ctx->tx.prepend_size = TLS_HEADER_SIZE + nonce_size;
706 ctx->tx.tag_size = tag_size;
707 ctx->tx.overhead_size = ctx->tx.prepend_size + ctx->tx.tag_size;
708 ctx->tx.iv_size = iv_size;
709 ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
710 GFP_KERNEL);
711 if (!ctx->tx.iv) {
712 rc = -ENOMEM;
713 goto free_offload_ctx;
714 }
715
716 memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size);
717
718 ctx->tx.rec_seq_size = rec_seq_size;
719 ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL);
720 if (!ctx->tx.rec_seq) {
721 rc = -ENOMEM;
722 goto free_iv;
723 }
724
725 rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info);
726 if (rc)
727 goto free_rec_seq;
728
729 /* start at rec_seq - 1 to account for the start marker record */
730 memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn));
731 offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1;
732
733 start_marker_record->end_seq = tcp_sk(sk)->write_seq;
734 start_marker_record->len = 0;
735 start_marker_record->num_frags = 0;
736
737 INIT_LIST_HEAD(&offload_ctx->records_list);
738 list_add_tail(&start_marker_record->list, &offload_ctx->records_list);
739 spin_lock_init(&offload_ctx->lock);
740 sg_init_table(offload_ctx->sg_tx_data,
741 ARRAY_SIZE(offload_ctx->sg_tx_data));
742
743 clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked);
744 ctx->push_pending_record = tls_device_push_pending_record;
745
746 /* TLS offload is greatly simplified if we don't send
747 * SKBs where only part of the payload needs to be encrypted.
748 * So mark the last skb in the write queue as end of record.
749 */
750 skb = tcp_write_queue_tail(sk);
751 if (skb)
752 TCP_SKB_CB(skb)->eor = 1;
753
754 /* We support starting offload on multiple sockets
755 * concurrently, so we only need a read lock here.
756 * This lock must precede get_netdev_for_sock to prevent races between
757 * NETDEV_DOWN and setsockopt.
758 */
759 down_read(&device_offload_lock);
760 netdev = get_netdev_for_sock(sk);
761 if (!netdev) {
762 pr_err_ratelimited("%s: netdev not found\n", __func__);
763 rc = -EINVAL;
764 goto release_lock;
765 }
766
767 if (!(netdev->features & NETIF_F_HW_TLS_TX)) {
768 rc = -ENOTSUPP;
769 goto release_netdev;
770 }
771
772 /* Avoid offloading if the device is down
773 * We don't want to offload new flows after
774 * the NETDEV_DOWN event
775 */
776 if (!(netdev->flags & IFF_UP)) {
777 rc = -EINVAL;
778 goto release_netdev;
779 }
780
781 ctx->priv_ctx_tx = offload_ctx;
782 rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX,
783 &ctx->crypto_send,
784 tcp_sk(sk)->write_seq);
785 if (rc)
786 goto release_netdev;
787
788 tls_device_attach(ctx, sk, netdev);
789
790 /* following this assignment tls_is_sk_tx_device_offloaded
791 * will return true and the context might be accessed
792 * by the netdev's xmit function.
793 */
794 smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb);
795 dev_put(netdev);
796 up_read(&device_offload_lock);
797 goto out;
798
799 release_netdev:
800 dev_put(netdev);
801 release_lock:
802 up_read(&device_offload_lock);
803 clean_acked_data_disable(inet_csk(sk));
804 crypto_free_aead(offload_ctx->aead_send);
805 free_rec_seq:
806 kfree(ctx->tx.rec_seq);
807 free_iv:
808 kfree(ctx->tx.iv);
809 free_offload_ctx:
810 kfree(offload_ctx);
811 ctx->priv_ctx_tx = NULL;
812 free_marker_record:
813 kfree(start_marker_record);
814 out:
815 return rc;
816 }
817
818 int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
819 {
820 struct tls_offload_context_rx *context;
821 struct net_device *netdev;
822 int rc = 0;
823
824 /* We support starting offload on multiple sockets
825 * concurrently, so we only need a read lock here.
826 * This lock must precede get_netdev_for_sock to prevent races between
827 * NETDEV_DOWN and setsockopt.
828 */
829 down_read(&device_offload_lock);
830 netdev = get_netdev_for_sock(sk);
831 if (!netdev) {
832 pr_err_ratelimited("%s: netdev not found\n", __func__);
833 rc = -EINVAL;
834 goto release_lock;
835 }
836
837 if (!(netdev->features & NETIF_F_HW_TLS_RX)) {
838 pr_err_ratelimited("%s: netdev %s with no TLS offload\n",
839 __func__, netdev->name);
840 rc = -ENOTSUPP;
841 goto release_netdev;
842 }
843
844 /* Avoid offloading if the device is down
845 * We don't want to offload new flows after
846 * the NETDEV_DOWN event
847 */
848 if (!(netdev->flags & IFF_UP)) {
849 rc = -EINVAL;
850 goto release_netdev;
851 }
852
853 context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL);
854 if (!context) {
855 rc = -ENOMEM;
856 goto release_netdev;
857 }
858
859 ctx->priv_ctx_rx = context;
860 rc = tls_set_sw_offload(sk, ctx, 0);
861 if (rc)
862 goto release_ctx;
863
864 rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX,
865 &ctx->crypto_recv,
866 tcp_sk(sk)->copied_seq);
867 if (rc) {
868 pr_err_ratelimited("%s: The netdev has refused to offload this socket\n",
869 __func__);
870 goto free_sw_resources;
871 }
872
873 tls_device_attach(ctx, sk, netdev);
874 goto release_netdev;
875
876 free_sw_resources:
877 tls_sw_free_resources_rx(sk);
878 release_ctx:
879 ctx->priv_ctx_rx = NULL;
880 release_netdev:
881 dev_put(netdev);
882 release_lock:
883 up_read(&device_offload_lock);
884 return rc;
885 }
886
887 void tls_device_offload_cleanup_rx(struct sock *sk)
888 {
889 struct tls_context *tls_ctx = tls_get_ctx(sk);
890 struct net_device *netdev;
891
892 down_read(&device_offload_lock);
893 netdev = tls_ctx->netdev;
894 if (!netdev)
895 goto out;
896
897 if (!(netdev->features & NETIF_F_HW_TLS_RX)) {
898 pr_err_ratelimited("%s: device is missing NETIF_F_HW_TLS_RX cap\n",
899 __func__);
900 goto out;
901 }
902
903 netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx,
904 TLS_OFFLOAD_CTX_DIR_RX);
905
906 if (tls_ctx->tx_conf != TLS_HW) {
907 dev_put(netdev);
908 tls_ctx->netdev = NULL;
909 }
910 out:
911 up_read(&device_offload_lock);
912 kfree(tls_ctx->rx.rec_seq);
913 kfree(tls_ctx->rx.iv);
914 tls_sw_release_resources_rx(sk);
915 }
916
917 static int tls_device_down(struct net_device *netdev)
918 {
919 struct tls_context *ctx, *tmp;
920 unsigned long flags;
921 LIST_HEAD(list);
922
923 /* Request a write lock to block new offload attempts */
924 down_write(&device_offload_lock);
925
926 spin_lock_irqsave(&tls_device_lock, flags);
927 list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) {
928 if (ctx->netdev != netdev ||
929 !refcount_inc_not_zero(&ctx->refcount))
930 continue;
931
932 list_move(&ctx->list, &list);
933 }
934 spin_unlock_irqrestore(&tls_device_lock, flags);
935
936 list_for_each_entry_safe(ctx, tmp, &list, list) {
937 if (ctx->tx_conf == TLS_HW)
938 netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
939 TLS_OFFLOAD_CTX_DIR_TX);
940 if (ctx->rx_conf == TLS_HW)
941 netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
942 TLS_OFFLOAD_CTX_DIR_RX);
943 ctx->netdev = NULL;
944 dev_put(netdev);
945 list_del_init(&ctx->list);
946
947 if (refcount_dec_and_test(&ctx->refcount))
948 tls_device_free_ctx(ctx);
949 }
950
951 up_write(&device_offload_lock);
952
953 flush_work(&tls_device_gc_work);
954
955 return NOTIFY_DONE;
956 }
957
958 static int tls_dev_event(struct notifier_block *this, unsigned long event,
959 void *ptr)
960 {
961 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
962
963 if (!(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX)))
964 return NOTIFY_DONE;
965
966 switch (event) {
967 case NETDEV_REGISTER:
968 case NETDEV_FEAT_CHANGE:
969 if ((dev->features & NETIF_F_HW_TLS_RX) &&
970 !dev->tlsdev_ops->tls_dev_resync_rx)
971 return NOTIFY_BAD;
972
973 if (dev->tlsdev_ops &&
974 dev->tlsdev_ops->tls_dev_add &&
975 dev->tlsdev_ops->tls_dev_del)
976 return NOTIFY_DONE;
977 else
978 return NOTIFY_BAD;
979 case NETDEV_DOWN:
980 return tls_device_down(dev);
981 }
982 return NOTIFY_DONE;
983 }
984
985 static struct notifier_block tls_dev_notifier = {
986 .notifier_call = tls_dev_event,
987 };
988
989 void __init tls_device_init(void)
990 {
991 register_netdevice_notifier(&tls_dev_notifier);
992 }
993
994 void __exit tls_device_cleanup(void)
995 {
996 unregister_netdevice_notifier(&tls_dev_notifier);
997 flush_work(&tls_device_gc_work);
998 }
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