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 #include "trace.h"
42
43 /* device_offload_lock is used to synchronize tls_dev_add
44 * against NETDEV_DOWN notifications.
45 */
46 static DECLARE_RWSEM(device_offload_lock);
47
48 static void tls_device_gc_task(struct work_struct *work);
49
50 static DECLARE_WORK(tls_device_gc_work, tls_device_gc_task);
51 static LIST_HEAD(tls_device_gc_list);
52 static LIST_HEAD(tls_device_list);
53 static DEFINE_SPINLOCK(tls_device_lock);
54
tls_device_free_ctx(struct tls_context * ctx)55 static void tls_device_free_ctx(struct tls_context *ctx)
56 {
57 if (ctx->tx_conf == TLS_HW) {
58 kfree(tls_offload_ctx_tx(ctx));
59 kfree(ctx->tx.rec_seq);
60 kfree(ctx->tx.iv);
61 }
62
63 if (ctx->rx_conf == TLS_HW)
64 kfree(tls_offload_ctx_rx(ctx));
65
66 tls_ctx_free(NULL, ctx);
67 }
68
tls_device_gc_task(struct work_struct * work)69 static void tls_device_gc_task(struct work_struct *work)
70 {
71 struct tls_context *ctx, *tmp;
72 unsigned long flags;
73 LIST_HEAD(gc_list);
74
75 spin_lock_irqsave(&tls_device_lock, flags);
76 list_splice_init(&tls_device_gc_list, &gc_list);
77 spin_unlock_irqrestore(&tls_device_lock, flags);
78
79 list_for_each_entry_safe(ctx, tmp, &gc_list, list) {
80 struct net_device *netdev = ctx->netdev;
81
82 if (netdev && ctx->tx_conf == TLS_HW) {
83 netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
84 TLS_OFFLOAD_CTX_DIR_TX);
85 dev_put(netdev);
86 ctx->netdev = NULL;
87 }
88
89 list_del(&ctx->list);
90 tls_device_free_ctx(ctx);
91 }
92 }
93
tls_device_queue_ctx_destruction(struct tls_context * ctx)94 static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
95 {
96 unsigned long flags;
97
98 spin_lock_irqsave(&tls_device_lock, flags);
99 list_move_tail(&ctx->list, &tls_device_gc_list);
100
101 /* schedule_work inside the spinlock
102 * to make sure tls_device_down waits for that work.
103 */
104 schedule_work(&tls_device_gc_work);
105
106 spin_unlock_irqrestore(&tls_device_lock, flags);
107 }
108
109 /* We assume that the socket is already connected */
get_netdev_for_sock(struct sock * sk)110 static struct net_device *get_netdev_for_sock(struct sock *sk)
111 {
112 struct dst_entry *dst = sk_dst_get(sk);
113 struct net_device *netdev = NULL;
114
115 if (likely(dst)) {
116 netdev = dst->dev;
117 dev_hold(netdev);
118 }
119
120 dst_release(dst);
121
122 return netdev;
123 }
124
destroy_record(struct tls_record_info * record)125 static void destroy_record(struct tls_record_info *record)
126 {
127 int i;
128
129 for (i = 0; i < record->num_frags; i++)
130 __skb_frag_unref(&record->frags[i]);
131 kfree(record);
132 }
133
delete_all_records(struct tls_offload_context_tx * offload_ctx)134 static void delete_all_records(struct tls_offload_context_tx *offload_ctx)
135 {
136 struct tls_record_info *info, *temp;
137
138 list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) {
139 list_del(&info->list);
140 destroy_record(info);
141 }
142
143 offload_ctx->retransmit_hint = NULL;
144 }
145
tls_icsk_clean_acked(struct sock * sk,u32 acked_seq)146 static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq)
147 {
148 struct tls_context *tls_ctx = tls_get_ctx(sk);
149 struct tls_record_info *info, *temp;
150 struct tls_offload_context_tx *ctx;
151 u64 deleted_records = 0;
152 unsigned long flags;
153
154 if (!tls_ctx)
155 return;
156
157 ctx = tls_offload_ctx_tx(tls_ctx);
158
159 spin_lock_irqsave(&ctx->lock, flags);
160 info = ctx->retransmit_hint;
161 if (info && !before(acked_seq, info->end_seq))
162 ctx->retransmit_hint = NULL;
163
164 list_for_each_entry_safe(info, temp, &ctx->records_list, list) {
165 if (before(acked_seq, info->end_seq))
166 break;
167 list_del(&info->list);
168
169 destroy_record(info);
170 deleted_records++;
171 }
172
173 ctx->unacked_record_sn += deleted_records;
174 spin_unlock_irqrestore(&ctx->lock, flags);
175 }
176
177 /* At this point, there should be no references on this
178 * socket and no in-flight SKBs associated with this
179 * socket, so it is safe to free all the resources.
180 */
tls_device_sk_destruct(struct sock * sk)181 void tls_device_sk_destruct(struct sock *sk)
182 {
183 struct tls_context *tls_ctx = tls_get_ctx(sk);
184 struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
185
186 tls_ctx->sk_destruct(sk);
187
188 if (tls_ctx->tx_conf == TLS_HW) {
189 if (ctx->open_record)
190 destroy_record(ctx->open_record);
191 delete_all_records(ctx);
192 crypto_free_aead(ctx->aead_send);
193 clean_acked_data_disable(inet_csk(sk));
194 }
195
196 if (refcount_dec_and_test(&tls_ctx->refcount))
197 tls_device_queue_ctx_destruction(tls_ctx);
198 }
199 EXPORT_SYMBOL_GPL(tls_device_sk_destruct);
200
tls_device_free_resources_tx(struct sock * sk)201 void tls_device_free_resources_tx(struct sock *sk)
202 {
203 struct tls_context *tls_ctx = tls_get_ctx(sk);
204
205 tls_free_partial_record(sk, tls_ctx);
206 }
207
tls_offload_tx_resync_request(struct sock * sk,u32 got_seq,u32 exp_seq)208 void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq)
209 {
210 struct tls_context *tls_ctx = tls_get_ctx(sk);
211
212 trace_tls_device_tx_resync_req(sk, got_seq, exp_seq);
213 WARN_ON(test_and_set_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags));
214 }
215 EXPORT_SYMBOL_GPL(tls_offload_tx_resync_request);
216
tls_device_resync_tx(struct sock * sk,struct tls_context * tls_ctx,u32 seq)217 static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx,
218 u32 seq)
219 {
220 struct net_device *netdev;
221 struct sk_buff *skb;
222 int err = 0;
223 u8 *rcd_sn;
224
225 skb = tcp_write_queue_tail(sk);
226 if (skb)
227 TCP_SKB_CB(skb)->eor = 1;
228
229 rcd_sn = tls_ctx->tx.rec_seq;
230
231 trace_tls_device_tx_resync_send(sk, seq, rcd_sn);
232 down_read(&device_offload_lock);
233 netdev = tls_ctx->netdev;
234 if (netdev)
235 err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq,
236 rcd_sn,
237 TLS_OFFLOAD_CTX_DIR_TX);
238 up_read(&device_offload_lock);
239 if (err)
240 return;
241
242 clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags);
243 }
244
tls_append_frag(struct tls_record_info * record,struct page_frag * pfrag,int size)245 static void tls_append_frag(struct tls_record_info *record,
246 struct page_frag *pfrag,
247 int size)
248 {
249 skb_frag_t *frag;
250
251 frag = &record->frags[record->num_frags - 1];
252 if (skb_frag_page(frag) == pfrag->page &&
253 skb_frag_off(frag) + skb_frag_size(frag) == pfrag->offset) {
254 skb_frag_size_add(frag, size);
255 } else {
256 ++frag;
257 __skb_frag_set_page(frag, pfrag->page);
258 skb_frag_off_set(frag, pfrag->offset);
259 skb_frag_size_set(frag, size);
260 ++record->num_frags;
261 get_page(pfrag->page);
262 }
263
264 pfrag->offset += size;
265 record->len += size;
266 }
267
tls_push_record(struct sock * sk,struct tls_context * ctx,struct tls_offload_context_tx * offload_ctx,struct tls_record_info * record,int flags)268 static int tls_push_record(struct sock *sk,
269 struct tls_context *ctx,
270 struct tls_offload_context_tx *offload_ctx,
271 struct tls_record_info *record,
272 int flags)
273 {
274 struct tls_prot_info *prot = &ctx->prot_info;
275 struct tcp_sock *tp = tcp_sk(sk);
276 skb_frag_t *frag;
277 int i;
278
279 record->end_seq = tp->write_seq + record->len;
280 list_add_tail_rcu(&record->list, &offload_ctx->records_list);
281 offload_ctx->open_record = NULL;
282
283 if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags))
284 tls_device_resync_tx(sk, ctx, tp->write_seq);
285
286 tls_advance_record_sn(sk, prot, &ctx->tx);
287
288 for (i = 0; i < record->num_frags; i++) {
289 frag = &record->frags[i];
290 sg_unmark_end(&offload_ctx->sg_tx_data[i]);
291 sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag),
292 skb_frag_size(frag), skb_frag_off(frag));
293 sk_mem_charge(sk, skb_frag_size(frag));
294 get_page(skb_frag_page(frag));
295 }
296 sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]);
297
298 /* all ready, send */
299 return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags);
300 }
301
tls_device_record_close(struct sock * sk,struct tls_context * ctx,struct tls_record_info * record,struct page_frag * pfrag,unsigned char record_type)302 static int tls_device_record_close(struct sock *sk,
303 struct tls_context *ctx,
304 struct tls_record_info *record,
305 struct page_frag *pfrag,
306 unsigned char record_type)
307 {
308 struct tls_prot_info *prot = &ctx->prot_info;
309 int ret;
310
311 /* append tag
312 * device will fill in the tag, we just need to append a placeholder
313 * use socket memory to improve coalescing (re-using a single buffer
314 * increases frag count)
315 * if we can't allocate memory now, steal some back from data
316 */
317 if (likely(skb_page_frag_refill(prot->tag_size, pfrag,
318 sk->sk_allocation))) {
319 ret = 0;
320 tls_append_frag(record, pfrag, prot->tag_size);
321 } else {
322 ret = prot->tag_size;
323 if (record->len <= prot->overhead_size)
324 return -ENOMEM;
325 }
326
327 /* fill prepend */
328 tls_fill_prepend(ctx, skb_frag_address(&record->frags[0]),
329 record->len - prot->overhead_size,
330 record_type, prot->version);
331 return ret;
332 }
333
tls_create_new_record(struct tls_offload_context_tx * offload_ctx,struct page_frag * pfrag,size_t prepend_size)334 static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx,
335 struct page_frag *pfrag,
336 size_t prepend_size)
337 {
338 struct tls_record_info *record;
339 skb_frag_t *frag;
340
341 record = kmalloc(sizeof(*record), GFP_KERNEL);
342 if (!record)
343 return -ENOMEM;
344
345 frag = &record->frags[0];
346 __skb_frag_set_page(frag, pfrag->page);
347 skb_frag_off_set(frag, pfrag->offset);
348 skb_frag_size_set(frag, prepend_size);
349
350 get_page(pfrag->page);
351 pfrag->offset += prepend_size;
352
353 record->num_frags = 1;
354 record->len = prepend_size;
355 offload_ctx->open_record = record;
356 return 0;
357 }
358
tls_do_allocation(struct sock * sk,struct tls_offload_context_tx * offload_ctx,struct page_frag * pfrag,size_t prepend_size)359 static int tls_do_allocation(struct sock *sk,
360 struct tls_offload_context_tx *offload_ctx,
361 struct page_frag *pfrag,
362 size_t prepend_size)
363 {
364 int ret;
365
366 if (!offload_ctx->open_record) {
367 if (unlikely(!skb_page_frag_refill(prepend_size, pfrag,
368 sk->sk_allocation))) {
369 READ_ONCE(sk->sk_prot)->enter_memory_pressure(sk);
370 sk_stream_moderate_sndbuf(sk);
371 return -ENOMEM;
372 }
373
374 ret = tls_create_new_record(offload_ctx, pfrag, prepend_size);
375 if (ret)
376 return ret;
377
378 if (pfrag->size > pfrag->offset)
379 return 0;
380 }
381
382 if (!sk_page_frag_refill(sk, pfrag))
383 return -ENOMEM;
384
385 return 0;
386 }
387
tls_device_copy_data(void * addr,size_t bytes,struct iov_iter * i)388 static int tls_device_copy_data(void *addr, size_t bytes, struct iov_iter *i)
389 {
390 size_t pre_copy, nocache;
391
392 pre_copy = ~((unsigned long)addr - 1) & (SMP_CACHE_BYTES - 1);
393 if (pre_copy) {
394 pre_copy = min(pre_copy, bytes);
395 if (copy_from_iter(addr, pre_copy, i) != pre_copy)
396 return -EFAULT;
397 bytes -= pre_copy;
398 addr += pre_copy;
399 }
400
401 nocache = round_down(bytes, SMP_CACHE_BYTES);
402 if (copy_from_iter_nocache(addr, nocache, i) != nocache)
403 return -EFAULT;
404 bytes -= nocache;
405 addr += nocache;
406
407 if (bytes && copy_from_iter(addr, bytes, i) != bytes)
408 return -EFAULT;
409
410 return 0;
411 }
412
tls_push_data(struct sock * sk,struct iov_iter * msg_iter,size_t size,int flags,unsigned char record_type)413 static int tls_push_data(struct sock *sk,
414 struct iov_iter *msg_iter,
415 size_t size, int flags,
416 unsigned char record_type)
417 {
418 struct tls_context *tls_ctx = tls_get_ctx(sk);
419 struct tls_prot_info *prot = &tls_ctx->prot_info;
420 struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
421 struct tls_record_info *record = ctx->open_record;
422 int tls_push_record_flags;
423 struct page_frag *pfrag;
424 size_t orig_size = size;
425 u32 max_open_record_len;
426 bool more = false;
427 bool done = false;
428 int copy, rc = 0;
429 long timeo;
430
431 if (flags &
432 ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST))
433 return -EOPNOTSUPP;
434
435 if (unlikely(sk->sk_err))
436 return -sk->sk_err;
437
438 flags |= MSG_SENDPAGE_DECRYPTED;
439 tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST;
440
441 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
442 if (tls_is_partially_sent_record(tls_ctx)) {
443 rc = tls_push_partial_record(sk, tls_ctx, flags);
444 if (rc < 0)
445 return rc;
446 }
447
448 pfrag = sk_page_frag(sk);
449
450 /* TLS_HEADER_SIZE is not counted as part of the TLS record, and
451 * we need to leave room for an authentication tag.
452 */
453 max_open_record_len = TLS_MAX_PAYLOAD_SIZE +
454 prot->prepend_size;
455 do {
456 rc = tls_do_allocation(sk, ctx, pfrag, prot->prepend_size);
457 if (unlikely(rc)) {
458 rc = sk_stream_wait_memory(sk, &timeo);
459 if (!rc)
460 continue;
461
462 record = ctx->open_record;
463 if (!record)
464 break;
465 handle_error:
466 if (record_type != TLS_RECORD_TYPE_DATA) {
467 /* avoid sending partial
468 * record with type !=
469 * application_data
470 */
471 size = orig_size;
472 destroy_record(record);
473 ctx->open_record = NULL;
474 } else if (record->len > prot->prepend_size) {
475 goto last_record;
476 }
477
478 break;
479 }
480
481 record = ctx->open_record;
482 copy = min_t(size_t, size, (pfrag->size - pfrag->offset));
483 copy = min_t(size_t, copy, (max_open_record_len - record->len));
484
485 rc = tls_device_copy_data(page_address(pfrag->page) +
486 pfrag->offset, copy, msg_iter);
487 if (rc)
488 goto handle_error;
489 tls_append_frag(record, pfrag, copy);
490
491 size -= copy;
492 if (!size) {
493 last_record:
494 tls_push_record_flags = flags;
495 if (flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE)) {
496 more = true;
497 break;
498 }
499
500 done = true;
501 }
502
503 if (done || record->len >= max_open_record_len ||
504 (record->num_frags >= MAX_SKB_FRAGS - 1)) {
505 rc = tls_device_record_close(sk, tls_ctx, record,
506 pfrag, record_type);
507 if (rc) {
508 if (rc > 0) {
509 size += rc;
510 } else {
511 size = orig_size;
512 destroy_record(record);
513 ctx->open_record = NULL;
514 break;
515 }
516 }
517
518 rc = tls_push_record(sk,
519 tls_ctx,
520 ctx,
521 record,
522 tls_push_record_flags);
523 if (rc < 0)
524 break;
525 }
526 } while (!done);
527
528 tls_ctx->pending_open_record_frags = more;
529
530 if (orig_size - size > 0)
531 rc = orig_size - size;
532
533 return rc;
534 }
535
tls_device_sendmsg(struct sock * sk,struct msghdr * msg,size_t size)536 int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
537 {
538 unsigned char record_type = TLS_RECORD_TYPE_DATA;
539 struct tls_context *tls_ctx = tls_get_ctx(sk);
540 int rc;
541
542 mutex_lock(&tls_ctx->tx_lock);
543 lock_sock(sk);
544
545 if (unlikely(msg->msg_controllen)) {
546 rc = tls_proccess_cmsg(sk, msg, &record_type);
547 if (rc)
548 goto out;
549 }
550
551 rc = tls_push_data(sk, &msg->msg_iter, size,
552 msg->msg_flags, record_type);
553
554 out:
555 release_sock(sk);
556 mutex_unlock(&tls_ctx->tx_lock);
557 return rc;
558 }
559
tls_device_sendpage(struct sock * sk,struct page * page,int offset,size_t size,int flags)560 int tls_device_sendpage(struct sock *sk, struct page *page,
561 int offset, size_t size, int flags)
562 {
563 struct tls_context *tls_ctx = tls_get_ctx(sk);
564 struct iov_iter msg_iter;
565 char *kaddr;
566 struct kvec iov;
567 int rc;
568
569 if (flags & MSG_SENDPAGE_NOTLAST)
570 flags |= MSG_MORE;
571
572 mutex_lock(&tls_ctx->tx_lock);
573 lock_sock(sk);
574
575 if (flags & MSG_OOB) {
576 rc = -EOPNOTSUPP;
577 goto out;
578 }
579
580 kaddr = kmap(page);
581 iov.iov_base = kaddr + offset;
582 iov.iov_len = size;
583 iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size);
584 rc = tls_push_data(sk, &msg_iter, size,
585 flags, TLS_RECORD_TYPE_DATA);
586 kunmap(page);
587
588 out:
589 release_sock(sk);
590 mutex_unlock(&tls_ctx->tx_lock);
591 return rc;
592 }
593
tls_get_record(struct tls_offload_context_tx * context,u32 seq,u64 * p_record_sn)594 struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
595 u32 seq, u64 *p_record_sn)
596 {
597 u64 record_sn = context->hint_record_sn;
598 struct tls_record_info *info, *last;
599
600 info = context->retransmit_hint;
601 if (!info ||
602 before(seq, info->end_seq - info->len)) {
603 /* if retransmit_hint is irrelevant start
604 * from the beggining of the list
605 */
606 info = list_first_entry_or_null(&context->records_list,
607 struct tls_record_info, list);
608 if (!info)
609 return NULL;
610 /* send the start_marker record if seq number is before the
611 * tls offload start marker sequence number. This record is
612 * required to handle TCP packets which are before TLS offload
613 * started.
614 * And if it's not start marker, look if this seq number
615 * belongs to the list.
616 */
617 if (likely(!tls_record_is_start_marker(info))) {
618 /* we have the first record, get the last record to see
619 * if this seq number belongs to the list.
620 */
621 last = list_last_entry(&context->records_list,
622 struct tls_record_info, list);
623
624 if (!between(seq, tls_record_start_seq(info),
625 last->end_seq))
626 return NULL;
627 }
628 record_sn = context->unacked_record_sn;
629 }
630
631 /* We just need the _rcu for the READ_ONCE() */
632 rcu_read_lock();
633 list_for_each_entry_from_rcu(info, &context->records_list, list) {
634 if (before(seq, info->end_seq)) {
635 if (!context->retransmit_hint ||
636 after(info->end_seq,
637 context->retransmit_hint->end_seq)) {
638 context->hint_record_sn = record_sn;
639 context->retransmit_hint = info;
640 }
641 *p_record_sn = record_sn;
642 goto exit_rcu_unlock;
643 }
644 record_sn++;
645 }
646 info = NULL;
647
648 exit_rcu_unlock:
649 rcu_read_unlock();
650 return info;
651 }
652 EXPORT_SYMBOL(tls_get_record);
653
tls_device_push_pending_record(struct sock * sk,int flags)654 static int tls_device_push_pending_record(struct sock *sk, int flags)
655 {
656 struct iov_iter msg_iter;
657
658 iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0);
659 return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA);
660 }
661
tls_device_write_space(struct sock * sk,struct tls_context * ctx)662 void tls_device_write_space(struct sock *sk, struct tls_context *ctx)
663 {
664 if (tls_is_partially_sent_record(ctx)) {
665 gfp_t sk_allocation = sk->sk_allocation;
666
667 WARN_ON_ONCE(sk->sk_write_pending);
668
669 sk->sk_allocation = GFP_ATOMIC;
670 tls_push_partial_record(sk, ctx,
671 MSG_DONTWAIT | MSG_NOSIGNAL |
672 MSG_SENDPAGE_DECRYPTED);
673 sk->sk_allocation = sk_allocation;
674 }
675 }
676
tls_device_resync_rx(struct tls_context * tls_ctx,struct sock * sk,u32 seq,u8 * rcd_sn)677 static void tls_device_resync_rx(struct tls_context *tls_ctx,
678 struct sock *sk, u32 seq, u8 *rcd_sn)
679 {
680 struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);
681 struct net_device *netdev;
682
683 if (WARN_ON(test_and_set_bit(TLS_RX_SYNC_RUNNING, &tls_ctx->flags)))
684 return;
685
686 trace_tls_device_rx_resync_send(sk, seq, rcd_sn, rx_ctx->resync_type);
687 netdev = READ_ONCE(tls_ctx->netdev);
688 if (netdev)
689 netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn,
690 TLS_OFFLOAD_CTX_DIR_RX);
691 clear_bit_unlock(TLS_RX_SYNC_RUNNING, &tls_ctx->flags);
692 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICERESYNC);
693 }
694
695 static bool
tls_device_rx_resync_async(struct tls_offload_resync_async * resync_async,s64 resync_req,u32 * seq,u16 * rcd_delta)696 tls_device_rx_resync_async(struct tls_offload_resync_async *resync_async,
697 s64 resync_req, u32 *seq, u16 *rcd_delta)
698 {
699 u32 is_async = resync_req & RESYNC_REQ_ASYNC;
700 u32 req_seq = resync_req >> 32;
701 u32 req_end = req_seq + ((resync_req >> 16) & 0xffff);
702 u16 i;
703
704 *rcd_delta = 0;
705
706 if (is_async) {
707 /* shouldn't get to wraparound:
708 * too long in async stage, something bad happened
709 */
710 if (WARN_ON_ONCE(resync_async->rcd_delta == USHRT_MAX))
711 return false;
712
713 /* asynchronous stage: log all headers seq such that
714 * req_seq <= seq <= end_seq, and wait for real resync request
715 */
716 if (before(*seq, req_seq))
717 return false;
718 if (!after(*seq, req_end) &&
719 resync_async->loglen < TLS_DEVICE_RESYNC_ASYNC_LOGMAX)
720 resync_async->log[resync_async->loglen++] = *seq;
721
722 resync_async->rcd_delta++;
723
724 return false;
725 }
726
727 /* synchronous stage: check against the logged entries and
728 * proceed to check the next entries if no match was found
729 */
730 for (i = 0; i < resync_async->loglen; i++)
731 if (req_seq == resync_async->log[i] &&
732 atomic64_try_cmpxchg(&resync_async->req, &resync_req, 0)) {
733 *rcd_delta = resync_async->rcd_delta - i;
734 *seq = req_seq;
735 resync_async->loglen = 0;
736 resync_async->rcd_delta = 0;
737 return true;
738 }
739
740 resync_async->loglen = 0;
741 resync_async->rcd_delta = 0;
742
743 if (req_seq == *seq &&
744 atomic64_try_cmpxchg(&resync_async->req,
745 &resync_req, 0))
746 return true;
747
748 return false;
749 }
750
tls_device_rx_resync_new_rec(struct sock * sk,u32 rcd_len,u32 seq)751 void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq)
752 {
753 struct tls_context *tls_ctx = tls_get_ctx(sk);
754 struct tls_offload_context_rx *rx_ctx;
755 u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE];
756 u32 sock_data, is_req_pending;
757 struct tls_prot_info *prot;
758 s64 resync_req;
759 u16 rcd_delta;
760 u32 req_seq;
761
762 if (tls_ctx->rx_conf != TLS_HW)
763 return;
764
765 prot = &tls_ctx->prot_info;
766 rx_ctx = tls_offload_ctx_rx(tls_ctx);
767 memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size);
768
769 switch (rx_ctx->resync_type) {
770 case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ:
771 resync_req = atomic64_read(&rx_ctx->resync_req);
772 req_seq = resync_req >> 32;
773 seq += TLS_HEADER_SIZE - 1;
774 is_req_pending = resync_req;
775
776 if (likely(!is_req_pending) || req_seq != seq ||
777 !atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0))
778 return;
779 break;
780 case TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT:
781 if (likely(!rx_ctx->resync_nh_do_now))
782 return;
783
784 /* head of next rec is already in, note that the sock_inq will
785 * include the currently parsed message when called from parser
786 */
787 sock_data = tcp_inq(sk);
788 if (sock_data > rcd_len) {
789 trace_tls_device_rx_resync_nh_delay(sk, sock_data,
790 rcd_len);
791 return;
792 }
793
794 rx_ctx->resync_nh_do_now = 0;
795 seq += rcd_len;
796 tls_bigint_increment(rcd_sn, prot->rec_seq_size);
797 break;
798 case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ_ASYNC:
799 resync_req = atomic64_read(&rx_ctx->resync_async->req);
800 is_req_pending = resync_req;
801 if (likely(!is_req_pending))
802 return;
803
804 if (!tls_device_rx_resync_async(rx_ctx->resync_async,
805 resync_req, &seq, &rcd_delta))
806 return;
807 tls_bigint_subtract(rcd_sn, rcd_delta);
808 break;
809 }
810
811 tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn);
812 }
813
tls_device_core_ctrl_rx_resync(struct tls_context * tls_ctx,struct tls_offload_context_rx * ctx,struct sock * sk,struct sk_buff * skb)814 static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx,
815 struct tls_offload_context_rx *ctx,
816 struct sock *sk, struct sk_buff *skb)
817 {
818 struct strp_msg *rxm;
819
820 /* device will request resyncs by itself based on stream scan */
821 if (ctx->resync_type != TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT)
822 return;
823 /* already scheduled */
824 if (ctx->resync_nh_do_now)
825 return;
826 /* seen decrypted fragments since last fully-failed record */
827 if (ctx->resync_nh_reset) {
828 ctx->resync_nh_reset = 0;
829 ctx->resync_nh.decrypted_failed = 1;
830 ctx->resync_nh.decrypted_tgt = TLS_DEVICE_RESYNC_NH_START_IVAL;
831 return;
832 }
833
834 if (++ctx->resync_nh.decrypted_failed <= ctx->resync_nh.decrypted_tgt)
835 return;
836
837 /* doing resync, bump the next target in case it fails */
838 if (ctx->resync_nh.decrypted_tgt < TLS_DEVICE_RESYNC_NH_MAX_IVAL)
839 ctx->resync_nh.decrypted_tgt *= 2;
840 else
841 ctx->resync_nh.decrypted_tgt += TLS_DEVICE_RESYNC_NH_MAX_IVAL;
842
843 rxm = strp_msg(skb);
844
845 /* head of next rec is already in, parser will sync for us */
846 if (tcp_inq(sk) > rxm->full_len) {
847 trace_tls_device_rx_resync_nh_schedule(sk);
848 ctx->resync_nh_do_now = 1;
849 } else {
850 struct tls_prot_info *prot = &tls_ctx->prot_info;
851 u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE];
852
853 memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size);
854 tls_bigint_increment(rcd_sn, prot->rec_seq_size);
855
856 tls_device_resync_rx(tls_ctx, sk, tcp_sk(sk)->copied_seq,
857 rcd_sn);
858 }
859 }
860
tls_device_reencrypt(struct sock * sk,struct sk_buff * skb)861 static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb)
862 {
863 struct strp_msg *rxm = strp_msg(skb);
864 int err = 0, offset = rxm->offset, copy, nsg, data_len, pos;
865 struct sk_buff *skb_iter, *unused;
866 struct scatterlist sg[1];
867 char *orig_buf, *buf;
868
869 orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE +
870 TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation);
871 if (!orig_buf)
872 return -ENOMEM;
873 buf = orig_buf;
874
875 nsg = skb_cow_data(skb, 0, &unused);
876 if (unlikely(nsg < 0)) {
877 err = nsg;
878 goto free_buf;
879 }
880
881 sg_init_table(sg, 1);
882 sg_set_buf(&sg[0], buf,
883 rxm->full_len + TLS_HEADER_SIZE +
884 TLS_CIPHER_AES_GCM_128_IV_SIZE);
885 err = skb_copy_bits(skb, offset, buf,
886 TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE);
887 if (err)
888 goto free_buf;
889
890 /* We are interested only in the decrypted data not the auth */
891 err = decrypt_skb(sk, skb, sg);
892 if (err != -EBADMSG)
893 goto free_buf;
894 else
895 err = 0;
896
897 data_len = rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE;
898
899 if (skb_pagelen(skb) > offset) {
900 copy = min_t(int, skb_pagelen(skb) - offset, data_len);
901
902 if (skb->decrypted) {
903 err = skb_store_bits(skb, offset, buf, copy);
904 if (err)
905 goto free_buf;
906 }
907
908 offset += copy;
909 buf += copy;
910 }
911
912 pos = skb_pagelen(skb);
913 skb_walk_frags(skb, skb_iter) {
914 int frag_pos;
915
916 /* Practically all frags must belong to msg if reencrypt
917 * is needed with current strparser and coalescing logic,
918 * but strparser may "get optimized", so let's be safe.
919 */
920 if (pos + skb_iter->len <= offset)
921 goto done_with_frag;
922 if (pos >= data_len + rxm->offset)
923 break;
924
925 frag_pos = offset - pos;
926 copy = min_t(int, skb_iter->len - frag_pos,
927 data_len + rxm->offset - offset);
928
929 if (skb_iter->decrypted) {
930 err = skb_store_bits(skb_iter, frag_pos, buf, copy);
931 if (err)
932 goto free_buf;
933 }
934
935 offset += copy;
936 buf += copy;
937 done_with_frag:
938 pos += skb_iter->len;
939 }
940
941 free_buf:
942 kfree(orig_buf);
943 return err;
944 }
945
tls_device_decrypted(struct sock * sk,struct tls_context * tls_ctx,struct sk_buff * skb,struct strp_msg * rxm)946 int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx,
947 struct sk_buff *skb, struct strp_msg *rxm)
948 {
949 struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx);
950 int is_decrypted = skb->decrypted;
951 int is_encrypted = !is_decrypted;
952 struct sk_buff *skb_iter;
953
954 /* Check if all the data is decrypted already */
955 skb_walk_frags(skb, skb_iter) {
956 is_decrypted &= skb_iter->decrypted;
957 is_encrypted &= !skb_iter->decrypted;
958 }
959
960 trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len,
961 tls_ctx->rx.rec_seq, rxm->full_len,
962 is_encrypted, is_decrypted);
963
964 ctx->sw.decrypted |= is_decrypted;
965
966 /* Return immediately if the record is either entirely plaintext or
967 * entirely ciphertext. Otherwise handle reencrypt partially decrypted
968 * record.
969 */
970 if (is_decrypted) {
971 ctx->resync_nh_reset = 1;
972 return 0;
973 }
974 if (is_encrypted) {
975 tls_device_core_ctrl_rx_resync(tls_ctx, ctx, sk, skb);
976 return 0;
977 }
978
979 ctx->resync_nh_reset = 1;
980 return tls_device_reencrypt(sk, skb);
981 }
982
tls_device_attach(struct tls_context * ctx,struct sock * sk,struct net_device * netdev)983 static void tls_device_attach(struct tls_context *ctx, struct sock *sk,
984 struct net_device *netdev)
985 {
986 if (sk->sk_destruct != tls_device_sk_destruct) {
987 refcount_set(&ctx->refcount, 1);
988 dev_hold(netdev);
989 ctx->netdev = netdev;
990 spin_lock_irq(&tls_device_lock);
991 list_add_tail(&ctx->list, &tls_device_list);
992 spin_unlock_irq(&tls_device_lock);
993
994 ctx->sk_destruct = sk->sk_destruct;
995 smp_store_release(&sk->sk_destruct, tls_device_sk_destruct);
996 }
997 }
998
tls_set_device_offload(struct sock * sk,struct tls_context * ctx)999 int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
1000 {
1001 u16 nonce_size, tag_size, iv_size, rec_seq_size;
1002 struct tls_context *tls_ctx = tls_get_ctx(sk);
1003 struct tls_prot_info *prot = &tls_ctx->prot_info;
1004 struct tls_record_info *start_marker_record;
1005 struct tls_offload_context_tx *offload_ctx;
1006 struct tls_crypto_info *crypto_info;
1007 struct net_device *netdev;
1008 char *iv, *rec_seq;
1009 struct sk_buff *skb;
1010 __be64 rcd_sn;
1011 int rc;
1012
1013 if (!ctx)
1014 return -EINVAL;
1015
1016 if (ctx->priv_ctx_tx)
1017 return -EEXIST;
1018
1019 start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL);
1020 if (!start_marker_record)
1021 return -ENOMEM;
1022
1023 offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL);
1024 if (!offload_ctx) {
1025 rc = -ENOMEM;
1026 goto free_marker_record;
1027 }
1028
1029 crypto_info = &ctx->crypto_send.info;
1030 if (crypto_info->version != TLS_1_2_VERSION) {
1031 rc = -EOPNOTSUPP;
1032 goto free_offload_ctx;
1033 }
1034
1035 switch (crypto_info->cipher_type) {
1036 case TLS_CIPHER_AES_GCM_128:
1037 nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
1038 tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE;
1039 iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
1040 iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv;
1041 rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE;
1042 rec_seq =
1043 ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq;
1044 break;
1045 default:
1046 rc = -EINVAL;
1047 goto free_offload_ctx;
1048 }
1049
1050 /* Sanity-check the rec_seq_size for stack allocations */
1051 if (rec_seq_size > TLS_MAX_REC_SEQ_SIZE) {
1052 rc = -EINVAL;
1053 goto free_offload_ctx;
1054 }
1055
1056 prot->version = crypto_info->version;
1057 prot->cipher_type = crypto_info->cipher_type;
1058 prot->prepend_size = TLS_HEADER_SIZE + nonce_size;
1059 prot->tag_size = tag_size;
1060 prot->overhead_size = prot->prepend_size + prot->tag_size;
1061 prot->iv_size = iv_size;
1062 ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
1063 GFP_KERNEL);
1064 if (!ctx->tx.iv) {
1065 rc = -ENOMEM;
1066 goto free_offload_ctx;
1067 }
1068
1069 memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size);
1070
1071 prot->rec_seq_size = rec_seq_size;
1072 ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL);
1073 if (!ctx->tx.rec_seq) {
1074 rc = -ENOMEM;
1075 goto free_iv;
1076 }
1077
1078 rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info);
1079 if (rc)
1080 goto free_rec_seq;
1081
1082 /* start at rec_seq - 1 to account for the start marker record */
1083 memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn));
1084 offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1;
1085
1086 start_marker_record->end_seq = tcp_sk(sk)->write_seq;
1087 start_marker_record->len = 0;
1088 start_marker_record->num_frags = 0;
1089
1090 INIT_LIST_HEAD(&offload_ctx->records_list);
1091 list_add_tail(&start_marker_record->list, &offload_ctx->records_list);
1092 spin_lock_init(&offload_ctx->lock);
1093 sg_init_table(offload_ctx->sg_tx_data,
1094 ARRAY_SIZE(offload_ctx->sg_tx_data));
1095
1096 clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked);
1097 ctx->push_pending_record = tls_device_push_pending_record;
1098
1099 /* TLS offload is greatly simplified if we don't send
1100 * SKBs where only part of the payload needs to be encrypted.
1101 * So mark the last skb in the write queue as end of record.
1102 */
1103 skb = tcp_write_queue_tail(sk);
1104 if (skb)
1105 TCP_SKB_CB(skb)->eor = 1;
1106
1107 netdev = get_netdev_for_sock(sk);
1108 if (!netdev) {
1109 pr_err_ratelimited("%s: netdev not found\n", __func__);
1110 rc = -EINVAL;
1111 goto disable_cad;
1112 }
1113
1114 if (!(netdev->features & NETIF_F_HW_TLS_TX)) {
1115 rc = -EOPNOTSUPP;
1116 goto release_netdev;
1117 }
1118
1119 /* Avoid offloading if the device is down
1120 * We don't want to offload new flows after
1121 * the NETDEV_DOWN event
1122 *
1123 * device_offload_lock is taken in tls_devices's NETDEV_DOWN
1124 * handler thus protecting from the device going down before
1125 * ctx was added to tls_device_list.
1126 */
1127 down_read(&device_offload_lock);
1128 if (!(netdev->flags & IFF_UP)) {
1129 rc = -EINVAL;
1130 goto release_lock;
1131 }
1132
1133 ctx->priv_ctx_tx = offload_ctx;
1134 rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX,
1135 &ctx->crypto_send.info,
1136 tcp_sk(sk)->write_seq);
1137 trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_TX,
1138 tcp_sk(sk)->write_seq, rec_seq, rc);
1139 if (rc)
1140 goto release_lock;
1141
1142 tls_device_attach(ctx, sk, netdev);
1143 up_read(&device_offload_lock);
1144
1145 /* following this assignment tls_is_sk_tx_device_offloaded
1146 * will return true and the context might be accessed
1147 * by the netdev's xmit function.
1148 */
1149 smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb);
1150 dev_put(netdev);
1151
1152 return 0;
1153
1154 release_lock:
1155 up_read(&device_offload_lock);
1156 release_netdev:
1157 dev_put(netdev);
1158 disable_cad:
1159 clean_acked_data_disable(inet_csk(sk));
1160 crypto_free_aead(offload_ctx->aead_send);
1161 free_rec_seq:
1162 kfree(ctx->tx.rec_seq);
1163 free_iv:
1164 kfree(ctx->tx.iv);
1165 free_offload_ctx:
1166 kfree(offload_ctx);
1167 ctx->priv_ctx_tx = NULL;
1168 free_marker_record:
1169 kfree(start_marker_record);
1170 return rc;
1171 }
1172
tls_set_device_offload_rx(struct sock * sk,struct tls_context * ctx)1173 int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
1174 {
1175 struct tls12_crypto_info_aes_gcm_128 *info;
1176 struct tls_offload_context_rx *context;
1177 struct net_device *netdev;
1178 int rc = 0;
1179
1180 if (ctx->crypto_recv.info.version != TLS_1_2_VERSION)
1181 return -EOPNOTSUPP;
1182
1183 netdev = get_netdev_for_sock(sk);
1184 if (!netdev) {
1185 pr_err_ratelimited("%s: netdev not found\n", __func__);
1186 return -EINVAL;
1187 }
1188
1189 if (!(netdev->features & NETIF_F_HW_TLS_RX)) {
1190 rc = -EOPNOTSUPP;
1191 goto release_netdev;
1192 }
1193
1194 /* Avoid offloading if the device is down
1195 * We don't want to offload new flows after
1196 * the NETDEV_DOWN event
1197 *
1198 * device_offload_lock is taken in tls_devices's NETDEV_DOWN
1199 * handler thus protecting from the device going down before
1200 * ctx was added to tls_device_list.
1201 */
1202 down_read(&device_offload_lock);
1203 if (!(netdev->flags & IFF_UP)) {
1204 rc = -EINVAL;
1205 goto release_lock;
1206 }
1207
1208 context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL);
1209 if (!context) {
1210 rc = -ENOMEM;
1211 goto release_lock;
1212 }
1213 context->resync_nh_reset = 1;
1214
1215 ctx->priv_ctx_rx = context;
1216 rc = tls_set_sw_offload(sk, ctx, 0);
1217 if (rc)
1218 goto release_ctx;
1219
1220 rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX,
1221 &ctx->crypto_recv.info,
1222 tcp_sk(sk)->copied_seq);
1223 info = (void *)&ctx->crypto_recv.info;
1224 trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_RX,
1225 tcp_sk(sk)->copied_seq, info->rec_seq, rc);
1226 if (rc)
1227 goto free_sw_resources;
1228
1229 tls_device_attach(ctx, sk, netdev);
1230 up_read(&device_offload_lock);
1231
1232 dev_put(netdev);
1233
1234 return 0;
1235
1236 free_sw_resources:
1237 up_read(&device_offload_lock);
1238 tls_sw_free_resources_rx(sk);
1239 down_read(&device_offload_lock);
1240 release_ctx:
1241 ctx->priv_ctx_rx = NULL;
1242 release_lock:
1243 up_read(&device_offload_lock);
1244 release_netdev:
1245 dev_put(netdev);
1246 return rc;
1247 }
1248
tls_device_offload_cleanup_rx(struct sock * sk)1249 void tls_device_offload_cleanup_rx(struct sock *sk)
1250 {
1251 struct tls_context *tls_ctx = tls_get_ctx(sk);
1252 struct net_device *netdev;
1253
1254 down_read(&device_offload_lock);
1255 netdev = tls_ctx->netdev;
1256 if (!netdev)
1257 goto out;
1258
1259 netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx,
1260 TLS_OFFLOAD_CTX_DIR_RX);
1261
1262 if (tls_ctx->tx_conf != TLS_HW) {
1263 dev_put(netdev);
1264 tls_ctx->netdev = NULL;
1265 } else {
1266 set_bit(TLS_RX_DEV_CLOSED, &tls_ctx->flags);
1267 }
1268 out:
1269 up_read(&device_offload_lock);
1270 tls_sw_release_resources_rx(sk);
1271 }
1272
tls_device_down(struct net_device * netdev)1273 static int tls_device_down(struct net_device *netdev)
1274 {
1275 struct tls_context *ctx, *tmp;
1276 unsigned long flags;
1277 LIST_HEAD(list);
1278
1279 /* Request a write lock to block new offload attempts */
1280 down_write(&device_offload_lock);
1281
1282 spin_lock_irqsave(&tls_device_lock, flags);
1283 list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) {
1284 if (ctx->netdev != netdev ||
1285 !refcount_inc_not_zero(&ctx->refcount))
1286 continue;
1287
1288 list_move(&ctx->list, &list);
1289 }
1290 spin_unlock_irqrestore(&tls_device_lock, flags);
1291
1292 list_for_each_entry_safe(ctx, tmp, &list, list) {
1293 if (ctx->tx_conf == TLS_HW)
1294 netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
1295 TLS_OFFLOAD_CTX_DIR_TX);
1296 if (ctx->rx_conf == TLS_HW &&
1297 !test_bit(TLS_RX_DEV_CLOSED, &ctx->flags))
1298 netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
1299 TLS_OFFLOAD_CTX_DIR_RX);
1300 WRITE_ONCE(ctx->netdev, NULL);
1301 smp_mb__before_atomic(); /* pairs with test_and_set_bit() */
1302 while (test_bit(TLS_RX_SYNC_RUNNING, &ctx->flags))
1303 usleep_range(10, 200);
1304 dev_put(netdev);
1305 list_del_init(&ctx->list);
1306
1307 if (refcount_dec_and_test(&ctx->refcount))
1308 tls_device_free_ctx(ctx);
1309 }
1310
1311 up_write(&device_offload_lock);
1312
1313 flush_work(&tls_device_gc_work);
1314
1315 return NOTIFY_DONE;
1316 }
1317
tls_dev_event(struct notifier_block * this,unsigned long event,void * ptr)1318 static int tls_dev_event(struct notifier_block *this, unsigned long event,
1319 void *ptr)
1320 {
1321 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1322
1323 if (!dev->tlsdev_ops &&
1324 !(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX)))
1325 return NOTIFY_DONE;
1326
1327 switch (event) {
1328 case NETDEV_REGISTER:
1329 case NETDEV_FEAT_CHANGE:
1330 if ((dev->features & NETIF_F_HW_TLS_RX) &&
1331 !dev->tlsdev_ops->tls_dev_resync)
1332 return NOTIFY_BAD;
1333
1334 if (dev->tlsdev_ops &&
1335 dev->tlsdev_ops->tls_dev_add &&
1336 dev->tlsdev_ops->tls_dev_del)
1337 return NOTIFY_DONE;
1338 else
1339 return NOTIFY_BAD;
1340 case NETDEV_DOWN:
1341 return tls_device_down(dev);
1342 }
1343 return NOTIFY_DONE;
1344 }
1345
1346 static struct notifier_block tls_dev_notifier = {
1347 .notifier_call = tls_dev_event,
1348 };
1349
tls_device_init(void)1350 void __init tls_device_init(void)
1351 {
1352 register_netdevice_notifier(&tls_dev_notifier);
1353 }
1354
tls_device_cleanup(void)1355 void __exit tls_device_cleanup(void)
1356 {
1357 unregister_netdevice_notifier(&tls_dev_notifier);
1358 flush_work(&tls_device_gc_work);
1359 clean_acked_data_flush();
1360 }
1361
