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e8f69799 IL |
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 | { | |
5a03bc73 | 55 | if (ctx->tx_conf == TLS_HW) { |
4799ac81 | 56 | kfree(tls_offload_ctx_tx(ctx)); |
5a03bc73 JK |
57 | kfree(ctx->tx.rec_seq); |
58 | kfree(ctx->tx.iv); | |
59 | } | |
4799ac81 BP |
60 | |
61 | if (ctx->rx_conf == TLS_HW) | |
62 | kfree(tls_offload_ctx_rx(ctx)); | |
e8f69799 | 63 | |
acd3e96d | 64 | tls_ctx_free(ctx); |
e8f69799 IL |
65 | } |
66 | ||
67 | static void tls_device_gc_task(struct work_struct *work) | |
68 | { | |
69 | struct tls_context *ctx, *tmp; | |
70 | unsigned long flags; | |
71 | LIST_HEAD(gc_list); | |
72 | ||
73 | spin_lock_irqsave(&tls_device_lock, flags); | |
74 | list_splice_init(&tls_device_gc_list, &gc_list); | |
75 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
76 | ||
77 | list_for_each_entry_safe(ctx, tmp, &gc_list, list) { | |
78 | struct net_device *netdev = ctx->netdev; | |
79 | ||
4799ac81 | 80 | if (netdev && ctx->tx_conf == TLS_HW) { |
e8f69799 IL |
81 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, |
82 | TLS_OFFLOAD_CTX_DIR_TX); | |
83 | dev_put(netdev); | |
4799ac81 | 84 | ctx->netdev = NULL; |
e8f69799 IL |
85 | } |
86 | ||
87 | list_del(&ctx->list); | |
88 | tls_device_free_ctx(ctx); | |
89 | } | |
90 | } | |
91 | ||
92 | static void tls_device_queue_ctx_destruction(struct tls_context *ctx) | |
93 | { | |
94 | unsigned long flags; | |
95 | ||
96 | spin_lock_irqsave(&tls_device_lock, flags); | |
97 | list_move_tail(&ctx->list, &tls_device_gc_list); | |
98 | ||
99 | /* schedule_work inside the spinlock | |
100 | * to make sure tls_device_down waits for that work. | |
101 | */ | |
102 | schedule_work(&tls_device_gc_work); | |
103 | ||
104 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
105 | } | |
106 | ||
107 | /* We assume that the socket is already connected */ | |
108 | static struct net_device *get_netdev_for_sock(struct sock *sk) | |
109 | { | |
110 | struct dst_entry *dst = sk_dst_get(sk); | |
111 | struct net_device *netdev = NULL; | |
112 | ||
113 | if (likely(dst)) { | |
114 | netdev = dst->dev; | |
115 | dev_hold(netdev); | |
116 | } | |
117 | ||
118 | dst_release(dst); | |
119 | ||
120 | return netdev; | |
121 | } | |
122 | ||
123 | static void destroy_record(struct tls_record_info *record) | |
124 | { | |
125 | int nr_frags = record->num_frags; | |
126 | skb_frag_t *frag; | |
127 | ||
128 | while (nr_frags-- > 0) { | |
129 | frag = &record->frags[nr_frags]; | |
130 | __skb_frag_unref(frag); | |
131 | } | |
132 | kfree(record); | |
133 | } | |
134 | ||
d80a1b9d | 135 | static void delete_all_records(struct tls_offload_context_tx *offload_ctx) |
e8f69799 IL |
136 | { |
137 | struct tls_record_info *info, *temp; | |
138 | ||
139 | list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) { | |
140 | list_del(&info->list); | |
141 | destroy_record(info); | |
142 | } | |
143 | ||
144 | offload_ctx->retransmit_hint = NULL; | |
145 | } | |
146 | ||
147 | static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq) | |
148 | { | |
149 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
150 | struct tls_record_info *info, *temp; | |
d80a1b9d | 151 | struct tls_offload_context_tx *ctx; |
e8f69799 IL |
152 | u64 deleted_records = 0; |
153 | unsigned long flags; | |
154 | ||
155 | if (!tls_ctx) | |
156 | return; | |
157 | ||
d80a1b9d | 158 | ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 IL |
159 | |
160 | spin_lock_irqsave(&ctx->lock, flags); | |
161 | info = ctx->retransmit_hint; | |
162 | if (info && !before(acked_seq, info->end_seq)) { | |
163 | ctx->retransmit_hint = NULL; | |
164 | list_del(&info->list); | |
165 | destroy_record(info); | |
166 | deleted_records++; | |
167 | } | |
168 | ||
169 | list_for_each_entry_safe(info, temp, &ctx->records_list, list) { | |
170 | if (before(acked_seq, info->end_seq)) | |
171 | break; | |
172 | list_del(&info->list); | |
173 | ||
174 | destroy_record(info); | |
175 | deleted_records++; | |
176 | } | |
177 | ||
178 | ctx->unacked_record_sn += deleted_records; | |
179 | spin_unlock_irqrestore(&ctx->lock, flags); | |
180 | } | |
181 | ||
182 | /* At this point, there should be no references on this | |
183 | * socket and no in-flight SKBs associated with this | |
184 | * socket, so it is safe to free all the resources. | |
185 | */ | |
9e995797 | 186 | static void tls_device_sk_destruct(struct sock *sk) |
e8f69799 IL |
187 | { |
188 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
d80a1b9d | 189 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 | 190 | |
4799ac81 | 191 | tls_ctx->sk_destruct(sk); |
e8f69799 | 192 | |
4799ac81 BP |
193 | if (tls_ctx->tx_conf == TLS_HW) { |
194 | if (ctx->open_record) | |
195 | destroy_record(ctx->open_record); | |
196 | delete_all_records(ctx); | |
197 | crypto_free_aead(ctx->aead_send); | |
198 | clean_acked_data_disable(inet_csk(sk)); | |
199 | } | |
e8f69799 IL |
200 | |
201 | if (refcount_dec_and_test(&tls_ctx->refcount)) | |
202 | tls_device_queue_ctx_destruction(tls_ctx); | |
203 | } | |
e8f69799 | 204 | |
35b71a34 JK |
205 | void tls_device_free_resources_tx(struct sock *sk) |
206 | { | |
207 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
208 | ||
209 | tls_free_partial_record(sk, tls_ctx); | |
210 | } | |
211 | ||
50180074 JK |
212 | static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx, |
213 | u32 seq) | |
214 | { | |
215 | struct net_device *netdev; | |
216 | struct sk_buff *skb; | |
b5d9a834 | 217 | int err = 0; |
50180074 JK |
218 | u8 *rcd_sn; |
219 | ||
220 | skb = tcp_write_queue_tail(sk); | |
221 | if (skb) | |
222 | TCP_SKB_CB(skb)->eor = 1; | |
223 | ||
224 | rcd_sn = tls_ctx->tx.rec_seq; | |
225 | ||
226 | down_read(&device_offload_lock); | |
227 | netdev = tls_ctx->netdev; | |
228 | if (netdev) | |
b5d9a834 DM |
229 | err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, |
230 | rcd_sn, | |
231 | TLS_OFFLOAD_CTX_DIR_TX); | |
50180074 | 232 | up_read(&device_offload_lock); |
b5d9a834 DM |
233 | if (err) |
234 | return; | |
50180074 JK |
235 | |
236 | clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags); | |
237 | } | |
238 | ||
e8f69799 IL |
239 | static void tls_append_frag(struct tls_record_info *record, |
240 | struct page_frag *pfrag, | |
241 | int size) | |
242 | { | |
243 | skb_frag_t *frag; | |
244 | ||
245 | frag = &record->frags[record->num_frags - 1]; | |
246 | if (frag->page.p == pfrag->page && | |
247 | frag->page_offset + frag->size == pfrag->offset) { | |
248 | frag->size += size; | |
249 | } else { | |
250 | ++frag; | |
251 | frag->page.p = pfrag->page; | |
252 | frag->page_offset = pfrag->offset; | |
253 | frag->size = size; | |
254 | ++record->num_frags; | |
255 | get_page(pfrag->page); | |
256 | } | |
257 | ||
258 | pfrag->offset += size; | |
259 | record->len += size; | |
260 | } | |
261 | ||
262 | static int tls_push_record(struct sock *sk, | |
263 | struct tls_context *ctx, | |
d80a1b9d | 264 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
265 | struct tls_record_info *record, |
266 | struct page_frag *pfrag, | |
267 | int flags, | |
268 | unsigned char record_type) | |
269 | { | |
4509de14 | 270 | struct tls_prot_info *prot = &ctx->prot_info; |
e8f69799 IL |
271 | struct tcp_sock *tp = tcp_sk(sk); |
272 | struct page_frag dummy_tag_frag; | |
273 | skb_frag_t *frag; | |
274 | int i; | |
275 | ||
276 | /* fill prepend */ | |
277 | frag = &record->frags[0]; | |
278 | tls_fill_prepend(ctx, | |
279 | skb_frag_address(frag), | |
4509de14 | 280 | record->len - prot->prepend_size, |
130b392c | 281 | record_type, |
9cd81988 | 282 | prot->version); |
e8f69799 IL |
283 | |
284 | /* HW doesn't care about the data in the tag, because it fills it. */ | |
285 | dummy_tag_frag.page = skb_frag_page(frag); | |
286 | dummy_tag_frag.offset = 0; | |
287 | ||
4509de14 | 288 | tls_append_frag(record, &dummy_tag_frag, prot->tag_size); |
e8f69799 IL |
289 | record->end_seq = tp->write_seq + record->len; |
290 | spin_lock_irq(&offload_ctx->lock); | |
291 | list_add_tail(&record->list, &offload_ctx->records_list); | |
292 | spin_unlock_irq(&offload_ctx->lock); | |
293 | offload_ctx->open_record = NULL; | |
50180074 JK |
294 | |
295 | if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags)) | |
296 | tls_device_resync_tx(sk, ctx, tp->write_seq); | |
297 | ||
fb0f886f | 298 | tls_advance_record_sn(sk, prot, &ctx->tx); |
e8f69799 IL |
299 | |
300 | for (i = 0; i < record->num_frags; i++) { | |
301 | frag = &record->frags[i]; | |
302 | sg_unmark_end(&offload_ctx->sg_tx_data[i]); | |
303 | sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag), | |
304 | frag->size, frag->page_offset); | |
305 | sk_mem_charge(sk, frag->size); | |
306 | get_page(skb_frag_page(frag)); | |
307 | } | |
308 | sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]); | |
309 | ||
310 | /* all ready, send */ | |
311 | return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags); | |
312 | } | |
313 | ||
d80a1b9d | 314 | static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
315 | struct page_frag *pfrag, |
316 | size_t prepend_size) | |
317 | { | |
318 | struct tls_record_info *record; | |
319 | skb_frag_t *frag; | |
320 | ||
321 | record = kmalloc(sizeof(*record), GFP_KERNEL); | |
322 | if (!record) | |
323 | return -ENOMEM; | |
324 | ||
325 | frag = &record->frags[0]; | |
326 | __skb_frag_set_page(frag, pfrag->page); | |
327 | frag->page_offset = pfrag->offset; | |
328 | skb_frag_size_set(frag, prepend_size); | |
329 | ||
330 | get_page(pfrag->page); | |
331 | pfrag->offset += prepend_size; | |
332 | ||
333 | record->num_frags = 1; | |
334 | record->len = prepend_size; | |
335 | offload_ctx->open_record = record; | |
336 | return 0; | |
337 | } | |
338 | ||
339 | static int tls_do_allocation(struct sock *sk, | |
d80a1b9d | 340 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
341 | struct page_frag *pfrag, |
342 | size_t prepend_size) | |
343 | { | |
344 | int ret; | |
345 | ||
346 | if (!offload_ctx->open_record) { | |
347 | if (unlikely(!skb_page_frag_refill(prepend_size, pfrag, | |
348 | sk->sk_allocation))) { | |
349 | sk->sk_prot->enter_memory_pressure(sk); | |
350 | sk_stream_moderate_sndbuf(sk); | |
351 | return -ENOMEM; | |
352 | } | |
353 | ||
354 | ret = tls_create_new_record(offload_ctx, pfrag, prepend_size); | |
355 | if (ret) | |
356 | return ret; | |
357 | ||
358 | if (pfrag->size > pfrag->offset) | |
359 | return 0; | |
360 | } | |
361 | ||
362 | if (!sk_page_frag_refill(sk, pfrag)) | |
363 | return -ENOMEM; | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | static int tls_push_data(struct sock *sk, | |
369 | struct iov_iter *msg_iter, | |
370 | size_t size, int flags, | |
371 | unsigned char record_type) | |
372 | { | |
373 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 374 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
d80a1b9d | 375 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 IL |
376 | int tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST; |
377 | int more = flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE); | |
378 | struct tls_record_info *record = ctx->open_record; | |
379 | struct page_frag *pfrag; | |
380 | size_t orig_size = size; | |
381 | u32 max_open_record_len; | |
382 | int copy, rc = 0; | |
383 | bool done = false; | |
384 | long timeo; | |
385 | ||
386 | if (flags & | |
387 | ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST)) | |
388 | return -ENOTSUPP; | |
389 | ||
390 | if (sk->sk_err) | |
391 | return -sk->sk_err; | |
392 | ||
393 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); | |
94850257 BP |
394 | if (tls_is_partially_sent_record(tls_ctx)) { |
395 | rc = tls_push_partial_record(sk, tls_ctx, flags); | |
396 | if (rc < 0) | |
397 | return rc; | |
398 | } | |
e8f69799 IL |
399 | |
400 | pfrag = sk_page_frag(sk); | |
401 | ||
402 | /* TLS_HEADER_SIZE is not counted as part of the TLS record, and | |
403 | * we need to leave room for an authentication tag. | |
404 | */ | |
405 | max_open_record_len = TLS_MAX_PAYLOAD_SIZE + | |
4509de14 | 406 | prot->prepend_size; |
e8f69799 IL |
407 | do { |
408 | rc = tls_do_allocation(sk, ctx, pfrag, | |
4509de14 | 409 | prot->prepend_size); |
e8f69799 IL |
410 | if (rc) { |
411 | rc = sk_stream_wait_memory(sk, &timeo); | |
412 | if (!rc) | |
413 | continue; | |
414 | ||
415 | record = ctx->open_record; | |
416 | if (!record) | |
417 | break; | |
418 | handle_error: | |
419 | if (record_type != TLS_RECORD_TYPE_DATA) { | |
420 | /* avoid sending partial | |
421 | * record with type != | |
422 | * application_data | |
423 | */ | |
424 | size = orig_size; | |
425 | destroy_record(record); | |
426 | ctx->open_record = NULL; | |
4509de14 | 427 | } else if (record->len > prot->prepend_size) { |
e8f69799 IL |
428 | goto last_record; |
429 | } | |
430 | ||
431 | break; | |
432 | } | |
433 | ||
434 | record = ctx->open_record; | |
435 | copy = min_t(size_t, size, (pfrag->size - pfrag->offset)); | |
436 | copy = min_t(size_t, copy, (max_open_record_len - record->len)); | |
437 | ||
438 | if (copy_from_iter_nocache(page_address(pfrag->page) + | |
439 | pfrag->offset, | |
440 | copy, msg_iter) != copy) { | |
441 | rc = -EFAULT; | |
442 | goto handle_error; | |
443 | } | |
444 | tls_append_frag(record, pfrag, copy); | |
445 | ||
446 | size -= copy; | |
447 | if (!size) { | |
448 | last_record: | |
449 | tls_push_record_flags = flags; | |
450 | if (more) { | |
451 | tls_ctx->pending_open_record_frags = | |
d829e9c4 | 452 | !!record->num_frags; |
e8f69799 IL |
453 | break; |
454 | } | |
455 | ||
456 | done = true; | |
457 | } | |
458 | ||
459 | if (done || record->len >= max_open_record_len || | |
460 | (record->num_frags >= MAX_SKB_FRAGS - 1)) { | |
461 | rc = tls_push_record(sk, | |
462 | tls_ctx, | |
463 | ctx, | |
464 | record, | |
465 | pfrag, | |
466 | tls_push_record_flags, | |
467 | record_type); | |
468 | if (rc < 0) | |
469 | break; | |
470 | } | |
471 | } while (!done); | |
472 | ||
473 | if (orig_size - size > 0) | |
474 | rc = orig_size - size; | |
475 | ||
476 | return rc; | |
477 | } | |
478 | ||
479 | int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
480 | { | |
481 | unsigned char record_type = TLS_RECORD_TYPE_DATA; | |
482 | int rc; | |
483 | ||
484 | lock_sock(sk); | |
485 | ||
486 | if (unlikely(msg->msg_controllen)) { | |
487 | rc = tls_proccess_cmsg(sk, msg, &record_type); | |
488 | if (rc) | |
489 | goto out; | |
490 | } | |
491 | ||
492 | rc = tls_push_data(sk, &msg->msg_iter, size, | |
493 | msg->msg_flags, record_type); | |
494 | ||
495 | out: | |
496 | release_sock(sk); | |
497 | return rc; | |
498 | } | |
499 | ||
500 | int tls_device_sendpage(struct sock *sk, struct page *page, | |
501 | int offset, size_t size, int flags) | |
502 | { | |
503 | struct iov_iter msg_iter; | |
504 | char *kaddr = kmap(page); | |
505 | struct kvec iov; | |
506 | int rc; | |
507 | ||
508 | if (flags & MSG_SENDPAGE_NOTLAST) | |
509 | flags |= MSG_MORE; | |
510 | ||
511 | lock_sock(sk); | |
512 | ||
513 | if (flags & MSG_OOB) { | |
514 | rc = -ENOTSUPP; | |
515 | goto out; | |
516 | } | |
517 | ||
518 | iov.iov_base = kaddr + offset; | |
519 | iov.iov_len = size; | |
aa563d7b | 520 | iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size); |
e8f69799 IL |
521 | rc = tls_push_data(sk, &msg_iter, size, |
522 | flags, TLS_RECORD_TYPE_DATA); | |
523 | kunmap(page); | |
524 | ||
525 | out: | |
526 | release_sock(sk); | |
527 | return rc; | |
528 | } | |
529 | ||
d80a1b9d | 530 | struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context, |
e8f69799 IL |
531 | u32 seq, u64 *p_record_sn) |
532 | { | |
533 | u64 record_sn = context->hint_record_sn; | |
534 | struct tls_record_info *info; | |
535 | ||
536 | info = context->retransmit_hint; | |
537 | if (!info || | |
538 | before(seq, info->end_seq - info->len)) { | |
539 | /* if retransmit_hint is irrelevant start | |
540 | * from the beggining of the list | |
541 | */ | |
542 | info = list_first_entry(&context->records_list, | |
543 | struct tls_record_info, list); | |
544 | record_sn = context->unacked_record_sn; | |
545 | } | |
546 | ||
547 | list_for_each_entry_from(info, &context->records_list, list) { | |
548 | if (before(seq, info->end_seq)) { | |
549 | if (!context->retransmit_hint || | |
550 | after(info->end_seq, | |
551 | context->retransmit_hint->end_seq)) { | |
552 | context->hint_record_sn = record_sn; | |
553 | context->retransmit_hint = info; | |
554 | } | |
555 | *p_record_sn = record_sn; | |
556 | return info; | |
557 | } | |
558 | record_sn++; | |
559 | } | |
560 | ||
561 | return NULL; | |
562 | } | |
563 | EXPORT_SYMBOL(tls_get_record); | |
564 | ||
565 | static int tls_device_push_pending_record(struct sock *sk, int flags) | |
566 | { | |
567 | struct iov_iter msg_iter; | |
568 | ||
aa563d7b | 569 | iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0); |
e8f69799 IL |
570 | return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA); |
571 | } | |
572 | ||
7463d3a2 BP |
573 | void tls_device_write_space(struct sock *sk, struct tls_context *ctx) |
574 | { | |
7463d3a2 BP |
575 | if (!sk->sk_write_pending && tls_is_partially_sent_record(ctx)) { |
576 | gfp_t sk_allocation = sk->sk_allocation; | |
577 | ||
578 | sk->sk_allocation = GFP_ATOMIC; | |
88c80bee | 579 | tls_push_partial_record(sk, ctx, MSG_DONTWAIT | MSG_NOSIGNAL); |
7463d3a2 BP |
580 | sk->sk_allocation = sk_allocation; |
581 | } | |
7463d3a2 BP |
582 | } |
583 | ||
e52972c1 | 584 | static void tls_device_resync_rx(struct tls_context *tls_ctx, |
89fec474 | 585 | struct sock *sk, u32 seq, u8 *rcd_sn) |
e52972c1 JK |
586 | { |
587 | struct net_device *netdev; | |
588 | ||
589 | if (WARN_ON(test_and_set_bit(TLS_RX_SYNC_RUNNING, &tls_ctx->flags))) | |
590 | return; | |
591 | netdev = READ_ONCE(tls_ctx->netdev); | |
592 | if (netdev) | |
eeb2efaf JK |
593 | netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn, |
594 | TLS_OFFLOAD_CTX_DIR_RX); | |
e52972c1 JK |
595 | clear_bit_unlock(TLS_RX_SYNC_RUNNING, &tls_ctx->flags); |
596 | } | |
597 | ||
f953d33b | 598 | void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) |
4799ac81 BP |
599 | { |
600 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4799ac81 | 601 | struct tls_offload_context_rx *rx_ctx; |
f953d33b JK |
602 | u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; |
603 | struct tls_prot_info *prot; | |
4799ac81 BP |
604 | u32 is_req_pending; |
605 | s64 resync_req; | |
606 | u32 req_seq; | |
607 | ||
608 | if (tls_ctx->rx_conf != TLS_HW) | |
609 | return; | |
610 | ||
f953d33b | 611 | prot = &tls_ctx->prot_info; |
4799ac81 | 612 | rx_ctx = tls_offload_ctx_rx(tls_ctx); |
f953d33b JK |
613 | memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); |
614 | ||
615 | switch (rx_ctx->resync_type) { | |
616 | case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ: | |
617 | resync_req = atomic64_read(&rx_ctx->resync_req); | |
618 | req_seq = resync_req >> 32; | |
619 | seq += TLS_HEADER_SIZE - 1; | |
620 | is_req_pending = resync_req; | |
621 | ||
622 | if (likely(!is_req_pending) || req_seq != seq || | |
623 | !atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0)) | |
624 | return; | |
625 | break; | |
626 | case TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT: | |
627 | if (likely(!rx_ctx->resync_nh_do_now)) | |
628 | return; | |
629 | ||
630 | /* head of next rec is already in, note that the sock_inq will | |
631 | * include the currently parsed message when called from parser | |
632 | */ | |
633 | if (tcp_inq(sk) > rcd_len) | |
634 | return; | |
635 | ||
636 | rx_ctx->resync_nh_do_now = 0; | |
637 | seq += rcd_len; | |
638 | tls_bigint_increment(rcd_sn, prot->rec_seq_size); | |
639 | break; | |
640 | } | |
641 | ||
642 | tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn); | |
643 | } | |
644 | ||
645 | static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx, | |
646 | struct tls_offload_context_rx *ctx, | |
647 | struct sock *sk, struct sk_buff *skb) | |
648 | { | |
649 | struct strp_msg *rxm; | |
650 | ||
651 | /* device will request resyncs by itself based on stream scan */ | |
652 | if (ctx->resync_type != TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT) | |
653 | return; | |
654 | /* already scheduled */ | |
655 | if (ctx->resync_nh_do_now) | |
656 | return; | |
657 | /* seen decrypted fragments since last fully-failed record */ | |
658 | if (ctx->resync_nh_reset) { | |
659 | ctx->resync_nh_reset = 0; | |
660 | ctx->resync_nh.decrypted_failed = 1; | |
661 | ctx->resync_nh.decrypted_tgt = TLS_DEVICE_RESYNC_NH_START_IVAL; | |
662 | return; | |
663 | } | |
664 | ||
665 | if (++ctx->resync_nh.decrypted_failed <= ctx->resync_nh.decrypted_tgt) | |
666 | return; | |
667 | ||
668 | /* doing resync, bump the next target in case it fails */ | |
669 | if (ctx->resync_nh.decrypted_tgt < TLS_DEVICE_RESYNC_NH_MAX_IVAL) | |
670 | ctx->resync_nh.decrypted_tgt *= 2; | |
671 | else | |
672 | ctx->resync_nh.decrypted_tgt += TLS_DEVICE_RESYNC_NH_MAX_IVAL; | |
673 | ||
674 | rxm = strp_msg(skb); | |
675 | ||
676 | /* head of next rec is already in, parser will sync for us */ | |
677 | if (tcp_inq(sk) > rxm->full_len) { | |
678 | ctx->resync_nh_do_now = 1; | |
679 | } else { | |
680 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
681 | u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; | |
682 | ||
683 | memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); | |
684 | tls_bigint_increment(rcd_sn, prot->rec_seq_size); | |
685 | ||
686 | tls_device_resync_rx(tls_ctx, sk, tcp_sk(sk)->copied_seq, | |
687 | rcd_sn); | |
688 | } | |
4799ac81 BP |
689 | } |
690 | ||
691 | static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb) | |
692 | { | |
693 | struct strp_msg *rxm = strp_msg(skb); | |
eb3d38d5 | 694 | int err = 0, offset = rxm->offset, copy, nsg, data_len, pos; |
4799ac81 BP |
695 | struct sk_buff *skb_iter, *unused; |
696 | struct scatterlist sg[1]; | |
697 | char *orig_buf, *buf; | |
698 | ||
699 | orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE + | |
700 | TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation); | |
701 | if (!orig_buf) | |
702 | return -ENOMEM; | |
703 | buf = orig_buf; | |
704 | ||
705 | nsg = skb_cow_data(skb, 0, &unused); | |
706 | if (unlikely(nsg < 0)) { | |
707 | err = nsg; | |
708 | goto free_buf; | |
709 | } | |
710 | ||
711 | sg_init_table(sg, 1); | |
712 | sg_set_buf(&sg[0], buf, | |
713 | rxm->full_len + TLS_HEADER_SIZE + | |
714 | TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
aeb11ff0 JK |
715 | err = skb_copy_bits(skb, offset, buf, |
716 | TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
717 | if (err) | |
718 | goto free_buf; | |
4799ac81 BP |
719 | |
720 | /* We are interested only in the decrypted data not the auth */ | |
721 | err = decrypt_skb(sk, skb, sg); | |
722 | if (err != -EBADMSG) | |
723 | goto free_buf; | |
724 | else | |
725 | err = 0; | |
726 | ||
eb3d38d5 | 727 | data_len = rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE; |
4799ac81 | 728 | |
97e1caa5 | 729 | if (skb_pagelen(skb) > offset) { |
eb3d38d5 | 730 | copy = min_t(int, skb_pagelen(skb) - offset, data_len); |
4799ac81 | 731 | |
aeb11ff0 JK |
732 | if (skb->decrypted) { |
733 | err = skb_store_bits(skb, offset, buf, copy); | |
734 | if (err) | |
735 | goto free_buf; | |
736 | } | |
4799ac81 | 737 | |
97e1caa5 JK |
738 | offset += copy; |
739 | buf += copy; | |
740 | } | |
4799ac81 | 741 | |
eb3d38d5 | 742 | pos = skb_pagelen(skb); |
4799ac81 | 743 | skb_walk_frags(skb, skb_iter) { |
eb3d38d5 JK |
744 | int frag_pos; |
745 | ||
746 | /* Practically all frags must belong to msg if reencrypt | |
747 | * is needed with current strparser and coalescing logic, | |
748 | * but strparser may "get optimized", so let's be safe. | |
749 | */ | |
750 | if (pos + skb_iter->len <= offset) | |
751 | goto done_with_frag; | |
752 | if (pos >= data_len + rxm->offset) | |
753 | break; | |
754 | ||
755 | frag_pos = offset - pos; | |
756 | copy = min_t(int, skb_iter->len - frag_pos, | |
757 | data_len + rxm->offset - offset); | |
4799ac81 | 758 | |
aeb11ff0 JK |
759 | if (skb_iter->decrypted) { |
760 | err = skb_store_bits(skb_iter, frag_pos, buf, copy); | |
761 | if (err) | |
762 | goto free_buf; | |
763 | } | |
4799ac81 BP |
764 | |
765 | offset += copy; | |
766 | buf += copy; | |
eb3d38d5 JK |
767 | done_with_frag: |
768 | pos += skb_iter->len; | |
4799ac81 BP |
769 | } |
770 | ||
771 | free_buf: | |
772 | kfree(orig_buf); | |
773 | return err; | |
774 | } | |
775 | ||
776 | int tls_device_decrypted(struct sock *sk, struct sk_buff *skb) | |
777 | { | |
778 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
779 | struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx); | |
780 | int is_decrypted = skb->decrypted; | |
781 | int is_encrypted = !is_decrypted; | |
782 | struct sk_buff *skb_iter; | |
783 | ||
4799ac81 BP |
784 | /* Check if all the data is decrypted already */ |
785 | skb_walk_frags(skb, skb_iter) { | |
786 | is_decrypted &= skb_iter->decrypted; | |
787 | is_encrypted &= !skb_iter->decrypted; | |
788 | } | |
789 | ||
790 | ctx->sw.decrypted |= is_decrypted; | |
791 | ||
f953d33b | 792 | /* Return immediately if the record is either entirely plaintext or |
4799ac81 BP |
793 | * entirely ciphertext. Otherwise handle reencrypt partially decrypted |
794 | * record. | |
795 | */ | |
f953d33b JK |
796 | if (is_decrypted) { |
797 | ctx->resync_nh_reset = 1; | |
798 | return 0; | |
799 | } | |
800 | if (is_encrypted) { | |
801 | tls_device_core_ctrl_rx_resync(tls_ctx, ctx, sk, skb); | |
802 | return 0; | |
803 | } | |
804 | ||
805 | ctx->resync_nh_reset = 1; | |
806 | return tls_device_reencrypt(sk, skb); | |
4799ac81 BP |
807 | } |
808 | ||
9e995797 JK |
809 | static void tls_device_attach(struct tls_context *ctx, struct sock *sk, |
810 | struct net_device *netdev) | |
811 | { | |
812 | if (sk->sk_destruct != tls_device_sk_destruct) { | |
813 | refcount_set(&ctx->refcount, 1); | |
814 | dev_hold(netdev); | |
815 | ctx->netdev = netdev; | |
816 | spin_lock_irq(&tls_device_lock); | |
817 | list_add_tail(&ctx->list, &tls_device_list); | |
818 | spin_unlock_irq(&tls_device_lock); | |
819 | ||
820 | ctx->sk_destruct = sk->sk_destruct; | |
821 | sk->sk_destruct = tls_device_sk_destruct; | |
822 | } | |
823 | } | |
824 | ||
e8f69799 IL |
825 | int tls_set_device_offload(struct sock *sk, struct tls_context *ctx) |
826 | { | |
827 | u16 nonce_size, tag_size, iv_size, rec_seq_size; | |
4509de14 VG |
828 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
829 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
e8f69799 | 830 | struct tls_record_info *start_marker_record; |
d80a1b9d | 831 | struct tls_offload_context_tx *offload_ctx; |
e8f69799 IL |
832 | struct tls_crypto_info *crypto_info; |
833 | struct net_device *netdev; | |
834 | char *iv, *rec_seq; | |
835 | struct sk_buff *skb; | |
836 | int rc = -EINVAL; | |
837 | __be64 rcd_sn; | |
838 | ||
839 | if (!ctx) | |
840 | goto out; | |
841 | ||
842 | if (ctx->priv_ctx_tx) { | |
843 | rc = -EEXIST; | |
844 | goto out; | |
845 | } | |
846 | ||
847 | start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL); | |
848 | if (!start_marker_record) { | |
849 | rc = -ENOMEM; | |
850 | goto out; | |
851 | } | |
852 | ||
d80a1b9d | 853 | offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL); |
e8f69799 IL |
854 | if (!offload_ctx) { |
855 | rc = -ENOMEM; | |
856 | goto free_marker_record; | |
857 | } | |
858 | ||
86029d10 | 859 | crypto_info = &ctx->crypto_send.info; |
618bac45 JK |
860 | if (crypto_info->version != TLS_1_2_VERSION) { |
861 | rc = -EOPNOTSUPP; | |
862 | goto free_offload_ctx; | |
863 | } | |
864 | ||
e8f69799 IL |
865 | switch (crypto_info->cipher_type) { |
866 | case TLS_CIPHER_AES_GCM_128: | |
867 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
868 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
869 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
870 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; | |
871 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; | |
872 | rec_seq = | |
873 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; | |
874 | break; | |
875 | default: | |
876 | rc = -EINVAL; | |
877 | goto free_offload_ctx; | |
878 | } | |
879 | ||
89fec474 JK |
880 | /* Sanity-check the rec_seq_size for stack allocations */ |
881 | if (rec_seq_size > TLS_MAX_REC_SEQ_SIZE) { | |
882 | rc = -EINVAL; | |
883 | goto free_offload_ctx; | |
884 | } | |
885 | ||
ab232e61 JK |
886 | prot->version = crypto_info->version; |
887 | prot->cipher_type = crypto_info->cipher_type; | |
4509de14 VG |
888 | prot->prepend_size = TLS_HEADER_SIZE + nonce_size; |
889 | prot->tag_size = tag_size; | |
890 | prot->overhead_size = prot->prepend_size + prot->tag_size; | |
891 | prot->iv_size = iv_size; | |
e8f69799 IL |
892 | ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
893 | GFP_KERNEL); | |
894 | if (!ctx->tx.iv) { | |
895 | rc = -ENOMEM; | |
896 | goto free_offload_ctx; | |
897 | } | |
898 | ||
899 | memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size); | |
900 | ||
4509de14 | 901 | prot->rec_seq_size = rec_seq_size; |
969d5090 | 902 | ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); |
e8f69799 IL |
903 | if (!ctx->tx.rec_seq) { |
904 | rc = -ENOMEM; | |
905 | goto free_iv; | |
906 | } | |
e8f69799 IL |
907 | |
908 | rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info); | |
909 | if (rc) | |
910 | goto free_rec_seq; | |
911 | ||
912 | /* start at rec_seq - 1 to account for the start marker record */ | |
913 | memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn)); | |
914 | offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1; | |
915 | ||
916 | start_marker_record->end_seq = tcp_sk(sk)->write_seq; | |
917 | start_marker_record->len = 0; | |
918 | start_marker_record->num_frags = 0; | |
919 | ||
920 | INIT_LIST_HEAD(&offload_ctx->records_list); | |
921 | list_add_tail(&start_marker_record->list, &offload_ctx->records_list); | |
922 | spin_lock_init(&offload_ctx->lock); | |
895262d8 BP |
923 | sg_init_table(offload_ctx->sg_tx_data, |
924 | ARRAY_SIZE(offload_ctx->sg_tx_data)); | |
e8f69799 IL |
925 | |
926 | clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked); | |
927 | ctx->push_pending_record = tls_device_push_pending_record; | |
e8f69799 IL |
928 | |
929 | /* TLS offload is greatly simplified if we don't send | |
930 | * SKBs where only part of the payload needs to be encrypted. | |
931 | * So mark the last skb in the write queue as end of record. | |
932 | */ | |
933 | skb = tcp_write_queue_tail(sk); | |
934 | if (skb) | |
935 | TCP_SKB_CB(skb)->eor = 1; | |
936 | ||
e8f69799 IL |
937 | /* We support starting offload on multiple sockets |
938 | * concurrently, so we only need a read lock here. | |
939 | * This lock must precede get_netdev_for_sock to prevent races between | |
940 | * NETDEV_DOWN and setsockopt. | |
941 | */ | |
942 | down_read(&device_offload_lock); | |
943 | netdev = get_netdev_for_sock(sk); | |
944 | if (!netdev) { | |
945 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
946 | rc = -EINVAL; | |
947 | goto release_lock; | |
948 | } | |
949 | ||
950 | if (!(netdev->features & NETIF_F_HW_TLS_TX)) { | |
951 | rc = -ENOTSUPP; | |
952 | goto release_netdev; | |
953 | } | |
954 | ||
955 | /* Avoid offloading if the device is down | |
956 | * We don't want to offload new flows after | |
957 | * the NETDEV_DOWN event | |
958 | */ | |
959 | if (!(netdev->flags & IFF_UP)) { | |
960 | rc = -EINVAL; | |
961 | goto release_netdev; | |
962 | } | |
963 | ||
964 | ctx->priv_ctx_tx = offload_ctx; | |
965 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX, | |
86029d10 | 966 | &ctx->crypto_send.info, |
e8f69799 IL |
967 | tcp_sk(sk)->write_seq); |
968 | if (rc) | |
969 | goto release_netdev; | |
970 | ||
4799ac81 | 971 | tls_device_attach(ctx, sk, netdev); |
e8f69799 | 972 | |
e8f69799 IL |
973 | /* following this assignment tls_is_sk_tx_device_offloaded |
974 | * will return true and the context might be accessed | |
975 | * by the netdev's xmit function. | |
976 | */ | |
4799ac81 BP |
977 | smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb); |
978 | dev_put(netdev); | |
e8f69799 IL |
979 | up_read(&device_offload_lock); |
980 | goto out; | |
981 | ||
982 | release_netdev: | |
983 | dev_put(netdev); | |
984 | release_lock: | |
985 | up_read(&device_offload_lock); | |
986 | clean_acked_data_disable(inet_csk(sk)); | |
987 | crypto_free_aead(offload_ctx->aead_send); | |
988 | free_rec_seq: | |
989 | kfree(ctx->tx.rec_seq); | |
990 | free_iv: | |
991 | kfree(ctx->tx.iv); | |
992 | free_offload_ctx: | |
993 | kfree(offload_ctx); | |
994 | ctx->priv_ctx_tx = NULL; | |
995 | free_marker_record: | |
996 | kfree(start_marker_record); | |
997 | out: | |
998 | return rc; | |
999 | } | |
1000 | ||
4799ac81 BP |
1001 | int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx) |
1002 | { | |
1003 | struct tls_offload_context_rx *context; | |
1004 | struct net_device *netdev; | |
1005 | int rc = 0; | |
1006 | ||
618bac45 JK |
1007 | if (ctx->crypto_recv.info.version != TLS_1_2_VERSION) |
1008 | return -EOPNOTSUPP; | |
1009 | ||
4799ac81 BP |
1010 | /* We support starting offload on multiple sockets |
1011 | * concurrently, so we only need a read lock here. | |
1012 | * This lock must precede get_netdev_for_sock to prevent races between | |
1013 | * NETDEV_DOWN and setsockopt. | |
1014 | */ | |
1015 | down_read(&device_offload_lock); | |
1016 | netdev = get_netdev_for_sock(sk); | |
1017 | if (!netdev) { | |
1018 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
1019 | rc = -EINVAL; | |
1020 | goto release_lock; | |
1021 | } | |
1022 | ||
1023 | if (!(netdev->features & NETIF_F_HW_TLS_RX)) { | |
4799ac81 BP |
1024 | rc = -ENOTSUPP; |
1025 | goto release_netdev; | |
1026 | } | |
1027 | ||
1028 | /* Avoid offloading if the device is down | |
1029 | * We don't want to offload new flows after | |
1030 | * the NETDEV_DOWN event | |
1031 | */ | |
1032 | if (!(netdev->flags & IFF_UP)) { | |
1033 | rc = -EINVAL; | |
1034 | goto release_netdev; | |
1035 | } | |
1036 | ||
1037 | context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL); | |
1038 | if (!context) { | |
1039 | rc = -ENOMEM; | |
1040 | goto release_netdev; | |
1041 | } | |
f953d33b | 1042 | context->resync_nh_reset = 1; |
4799ac81 BP |
1043 | |
1044 | ctx->priv_ctx_rx = context; | |
1045 | rc = tls_set_sw_offload(sk, ctx, 0); | |
1046 | if (rc) | |
1047 | goto release_ctx; | |
1048 | ||
1049 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX, | |
86029d10 | 1050 | &ctx->crypto_recv.info, |
4799ac81 | 1051 | tcp_sk(sk)->copied_seq); |
e49d268d | 1052 | if (rc) |
4799ac81 | 1053 | goto free_sw_resources; |
4799ac81 BP |
1054 | |
1055 | tls_device_attach(ctx, sk, netdev); | |
1056 | goto release_netdev; | |
1057 | ||
1058 | free_sw_resources: | |
62ef81d5 | 1059 | up_read(&device_offload_lock); |
4799ac81 | 1060 | tls_sw_free_resources_rx(sk); |
62ef81d5 | 1061 | down_read(&device_offload_lock); |
4799ac81 BP |
1062 | release_ctx: |
1063 | ctx->priv_ctx_rx = NULL; | |
1064 | release_netdev: | |
1065 | dev_put(netdev); | |
1066 | release_lock: | |
1067 | up_read(&device_offload_lock); | |
1068 | return rc; | |
1069 | } | |
1070 | ||
1071 | void tls_device_offload_cleanup_rx(struct sock *sk) | |
1072 | { | |
1073 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1074 | struct net_device *netdev; | |
1075 | ||
1076 | down_read(&device_offload_lock); | |
1077 | netdev = tls_ctx->netdev; | |
1078 | if (!netdev) | |
1079 | goto out; | |
1080 | ||
4799ac81 BP |
1081 | netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx, |
1082 | TLS_OFFLOAD_CTX_DIR_RX); | |
1083 | ||
1084 | if (tls_ctx->tx_conf != TLS_HW) { | |
1085 | dev_put(netdev); | |
1086 | tls_ctx->netdev = NULL; | |
1087 | } | |
1088 | out: | |
1089 | up_read(&device_offload_lock); | |
4799ac81 BP |
1090 | tls_sw_release_resources_rx(sk); |
1091 | } | |
1092 | ||
e8f69799 IL |
1093 | static int tls_device_down(struct net_device *netdev) |
1094 | { | |
1095 | struct tls_context *ctx, *tmp; | |
1096 | unsigned long flags; | |
1097 | LIST_HEAD(list); | |
1098 | ||
1099 | /* Request a write lock to block new offload attempts */ | |
1100 | down_write(&device_offload_lock); | |
1101 | ||
1102 | spin_lock_irqsave(&tls_device_lock, flags); | |
1103 | list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) { | |
1104 | if (ctx->netdev != netdev || | |
1105 | !refcount_inc_not_zero(&ctx->refcount)) | |
1106 | continue; | |
1107 | ||
1108 | list_move(&ctx->list, &list); | |
1109 | } | |
1110 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
1111 | ||
1112 | list_for_each_entry_safe(ctx, tmp, &list, list) { | |
4799ac81 BP |
1113 | if (ctx->tx_conf == TLS_HW) |
1114 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
1115 | TLS_OFFLOAD_CTX_DIR_TX); | |
1116 | if (ctx->rx_conf == TLS_HW) | |
1117 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
1118 | TLS_OFFLOAD_CTX_DIR_RX); | |
e52972c1 JK |
1119 | WRITE_ONCE(ctx->netdev, NULL); |
1120 | smp_mb__before_atomic(); /* pairs with test_and_set_bit() */ | |
1121 | while (test_bit(TLS_RX_SYNC_RUNNING, &ctx->flags)) | |
1122 | usleep_range(10, 200); | |
e8f69799 IL |
1123 | dev_put(netdev); |
1124 | list_del_init(&ctx->list); | |
1125 | ||
1126 | if (refcount_dec_and_test(&ctx->refcount)) | |
1127 | tls_device_free_ctx(ctx); | |
1128 | } | |
1129 | ||
1130 | up_write(&device_offload_lock); | |
1131 | ||
1132 | flush_work(&tls_device_gc_work); | |
1133 | ||
1134 | return NOTIFY_DONE; | |
1135 | } | |
1136 | ||
1137 | static int tls_dev_event(struct notifier_block *this, unsigned long event, | |
1138 | void *ptr) | |
1139 | { | |
1140 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1141 | ||
c3f4a6c3 JK |
1142 | if (!dev->tlsdev_ops && |
1143 | !(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX))) | |
e8f69799 IL |
1144 | return NOTIFY_DONE; |
1145 | ||
1146 | switch (event) { | |
1147 | case NETDEV_REGISTER: | |
1148 | case NETDEV_FEAT_CHANGE: | |
4799ac81 | 1149 | if ((dev->features & NETIF_F_HW_TLS_RX) && |
eeb2efaf | 1150 | !dev->tlsdev_ops->tls_dev_resync) |
4799ac81 BP |
1151 | return NOTIFY_BAD; |
1152 | ||
e8f69799 IL |
1153 | if (dev->tlsdev_ops && |
1154 | dev->tlsdev_ops->tls_dev_add && | |
1155 | dev->tlsdev_ops->tls_dev_del) | |
1156 | return NOTIFY_DONE; | |
1157 | else | |
1158 | return NOTIFY_BAD; | |
1159 | case NETDEV_DOWN: | |
1160 | return tls_device_down(dev); | |
1161 | } | |
1162 | return NOTIFY_DONE; | |
1163 | } | |
1164 | ||
1165 | static struct notifier_block tls_dev_notifier = { | |
1166 | .notifier_call = tls_dev_event, | |
1167 | }; | |
1168 | ||
1169 | void __init tls_device_init(void) | |
1170 | { | |
1171 | register_netdevice_notifier(&tls_dev_notifier); | |
1172 | } | |
1173 | ||
1174 | void __exit tls_device_cleanup(void) | |
1175 | { | |
1176 | unregister_netdevice_notifier(&tls_dev_notifier); | |
1177 | flush_work(&tls_device_gc_work); | |
494bc1d2 | 1178 | clean_acked_data_flush(); |
e8f69799 | 1179 | } |