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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 | |
e8f69799 IL |
64 | kfree(ctx); |
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 | ||
e8f69799 IL |
212 | static void tls_append_frag(struct tls_record_info *record, |
213 | struct page_frag *pfrag, | |
214 | int size) | |
215 | { | |
216 | skb_frag_t *frag; | |
217 | ||
218 | frag = &record->frags[record->num_frags - 1]; | |
219 | if (frag->page.p == pfrag->page && | |
220 | frag->page_offset + frag->size == pfrag->offset) { | |
221 | frag->size += size; | |
222 | } else { | |
223 | ++frag; | |
224 | frag->page.p = pfrag->page; | |
225 | frag->page_offset = pfrag->offset; | |
226 | frag->size = size; | |
227 | ++record->num_frags; | |
228 | get_page(pfrag->page); | |
229 | } | |
230 | ||
231 | pfrag->offset += size; | |
232 | record->len += size; | |
233 | } | |
234 | ||
235 | static int tls_push_record(struct sock *sk, | |
236 | struct tls_context *ctx, | |
d80a1b9d | 237 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
238 | struct tls_record_info *record, |
239 | struct page_frag *pfrag, | |
240 | int flags, | |
241 | unsigned char record_type) | |
242 | { | |
4509de14 | 243 | struct tls_prot_info *prot = &ctx->prot_info; |
e8f69799 IL |
244 | struct tcp_sock *tp = tcp_sk(sk); |
245 | struct page_frag dummy_tag_frag; | |
246 | skb_frag_t *frag; | |
247 | int i; | |
248 | ||
249 | /* fill prepend */ | |
250 | frag = &record->frags[0]; | |
251 | tls_fill_prepend(ctx, | |
252 | skb_frag_address(frag), | |
4509de14 | 253 | record->len - prot->prepend_size, |
130b392c DW |
254 | record_type, |
255 | ctx->crypto_send.info.version); | |
e8f69799 IL |
256 | |
257 | /* HW doesn't care about the data in the tag, because it fills it. */ | |
258 | dummy_tag_frag.page = skb_frag_page(frag); | |
259 | dummy_tag_frag.offset = 0; | |
260 | ||
4509de14 | 261 | tls_append_frag(record, &dummy_tag_frag, prot->tag_size); |
e8f69799 IL |
262 | record->end_seq = tp->write_seq + record->len; |
263 | spin_lock_irq(&offload_ctx->lock); | |
264 | list_add_tail(&record->list, &offload_ctx->records_list); | |
265 | spin_unlock_irq(&offload_ctx->lock); | |
266 | offload_ctx->open_record = NULL; | |
130b392c | 267 | tls_advance_record_sn(sk, &ctx->tx, ctx->crypto_send.info.version); |
e8f69799 IL |
268 | |
269 | for (i = 0; i < record->num_frags; i++) { | |
270 | frag = &record->frags[i]; | |
271 | sg_unmark_end(&offload_ctx->sg_tx_data[i]); | |
272 | sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag), | |
273 | frag->size, frag->page_offset); | |
274 | sk_mem_charge(sk, frag->size); | |
275 | get_page(skb_frag_page(frag)); | |
276 | } | |
277 | sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]); | |
278 | ||
279 | /* all ready, send */ | |
280 | return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags); | |
281 | } | |
282 | ||
d80a1b9d | 283 | static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
284 | struct page_frag *pfrag, |
285 | size_t prepend_size) | |
286 | { | |
287 | struct tls_record_info *record; | |
288 | skb_frag_t *frag; | |
289 | ||
290 | record = kmalloc(sizeof(*record), GFP_KERNEL); | |
291 | if (!record) | |
292 | return -ENOMEM; | |
293 | ||
294 | frag = &record->frags[0]; | |
295 | __skb_frag_set_page(frag, pfrag->page); | |
296 | frag->page_offset = pfrag->offset; | |
297 | skb_frag_size_set(frag, prepend_size); | |
298 | ||
299 | get_page(pfrag->page); | |
300 | pfrag->offset += prepend_size; | |
301 | ||
302 | record->num_frags = 1; | |
303 | record->len = prepend_size; | |
304 | offload_ctx->open_record = record; | |
305 | return 0; | |
306 | } | |
307 | ||
308 | static int tls_do_allocation(struct sock *sk, | |
d80a1b9d | 309 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
310 | struct page_frag *pfrag, |
311 | size_t prepend_size) | |
312 | { | |
313 | int ret; | |
314 | ||
315 | if (!offload_ctx->open_record) { | |
316 | if (unlikely(!skb_page_frag_refill(prepend_size, pfrag, | |
317 | sk->sk_allocation))) { | |
318 | sk->sk_prot->enter_memory_pressure(sk); | |
319 | sk_stream_moderate_sndbuf(sk); | |
320 | return -ENOMEM; | |
321 | } | |
322 | ||
323 | ret = tls_create_new_record(offload_ctx, pfrag, prepend_size); | |
324 | if (ret) | |
325 | return ret; | |
326 | ||
327 | if (pfrag->size > pfrag->offset) | |
328 | return 0; | |
329 | } | |
330 | ||
331 | if (!sk_page_frag_refill(sk, pfrag)) | |
332 | return -ENOMEM; | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static int tls_push_data(struct sock *sk, | |
338 | struct iov_iter *msg_iter, | |
339 | size_t size, int flags, | |
340 | unsigned char record_type) | |
341 | { | |
342 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 343 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
d80a1b9d | 344 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 IL |
345 | int tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST; |
346 | int more = flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE); | |
347 | struct tls_record_info *record = ctx->open_record; | |
348 | struct page_frag *pfrag; | |
349 | size_t orig_size = size; | |
350 | u32 max_open_record_len; | |
351 | int copy, rc = 0; | |
352 | bool done = false; | |
353 | long timeo; | |
354 | ||
355 | if (flags & | |
356 | ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST)) | |
357 | return -ENOTSUPP; | |
358 | ||
359 | if (sk->sk_err) | |
360 | return -sk->sk_err; | |
361 | ||
362 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); | |
94850257 BP |
363 | if (tls_is_partially_sent_record(tls_ctx)) { |
364 | rc = tls_push_partial_record(sk, tls_ctx, flags); | |
365 | if (rc < 0) | |
366 | return rc; | |
367 | } | |
e8f69799 IL |
368 | |
369 | pfrag = sk_page_frag(sk); | |
370 | ||
371 | /* TLS_HEADER_SIZE is not counted as part of the TLS record, and | |
372 | * we need to leave room for an authentication tag. | |
373 | */ | |
374 | max_open_record_len = TLS_MAX_PAYLOAD_SIZE + | |
4509de14 | 375 | prot->prepend_size; |
e8f69799 IL |
376 | do { |
377 | rc = tls_do_allocation(sk, ctx, pfrag, | |
4509de14 | 378 | prot->prepend_size); |
e8f69799 IL |
379 | if (rc) { |
380 | rc = sk_stream_wait_memory(sk, &timeo); | |
381 | if (!rc) | |
382 | continue; | |
383 | ||
384 | record = ctx->open_record; | |
385 | if (!record) | |
386 | break; | |
387 | handle_error: | |
388 | if (record_type != TLS_RECORD_TYPE_DATA) { | |
389 | /* avoid sending partial | |
390 | * record with type != | |
391 | * application_data | |
392 | */ | |
393 | size = orig_size; | |
394 | destroy_record(record); | |
395 | ctx->open_record = NULL; | |
4509de14 | 396 | } else if (record->len > prot->prepend_size) { |
e8f69799 IL |
397 | goto last_record; |
398 | } | |
399 | ||
400 | break; | |
401 | } | |
402 | ||
403 | record = ctx->open_record; | |
404 | copy = min_t(size_t, size, (pfrag->size - pfrag->offset)); | |
405 | copy = min_t(size_t, copy, (max_open_record_len - record->len)); | |
406 | ||
407 | if (copy_from_iter_nocache(page_address(pfrag->page) + | |
408 | pfrag->offset, | |
409 | copy, msg_iter) != copy) { | |
410 | rc = -EFAULT; | |
411 | goto handle_error; | |
412 | } | |
413 | tls_append_frag(record, pfrag, copy); | |
414 | ||
415 | size -= copy; | |
416 | if (!size) { | |
417 | last_record: | |
418 | tls_push_record_flags = flags; | |
419 | if (more) { | |
420 | tls_ctx->pending_open_record_frags = | |
d829e9c4 | 421 | !!record->num_frags; |
e8f69799 IL |
422 | break; |
423 | } | |
424 | ||
425 | done = true; | |
426 | } | |
427 | ||
428 | if (done || record->len >= max_open_record_len || | |
429 | (record->num_frags >= MAX_SKB_FRAGS - 1)) { | |
430 | rc = tls_push_record(sk, | |
431 | tls_ctx, | |
432 | ctx, | |
433 | record, | |
434 | pfrag, | |
435 | tls_push_record_flags, | |
436 | record_type); | |
437 | if (rc < 0) | |
438 | break; | |
439 | } | |
440 | } while (!done); | |
441 | ||
442 | if (orig_size - size > 0) | |
443 | rc = orig_size - size; | |
444 | ||
445 | return rc; | |
446 | } | |
447 | ||
448 | int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
449 | { | |
450 | unsigned char record_type = TLS_RECORD_TYPE_DATA; | |
451 | int rc; | |
452 | ||
453 | lock_sock(sk); | |
454 | ||
455 | if (unlikely(msg->msg_controllen)) { | |
456 | rc = tls_proccess_cmsg(sk, msg, &record_type); | |
457 | if (rc) | |
458 | goto out; | |
459 | } | |
460 | ||
461 | rc = tls_push_data(sk, &msg->msg_iter, size, | |
462 | msg->msg_flags, record_type); | |
463 | ||
464 | out: | |
465 | release_sock(sk); | |
466 | return rc; | |
467 | } | |
468 | ||
469 | int tls_device_sendpage(struct sock *sk, struct page *page, | |
470 | int offset, size_t size, int flags) | |
471 | { | |
472 | struct iov_iter msg_iter; | |
473 | char *kaddr = kmap(page); | |
474 | struct kvec iov; | |
475 | int rc; | |
476 | ||
477 | if (flags & MSG_SENDPAGE_NOTLAST) | |
478 | flags |= MSG_MORE; | |
479 | ||
480 | lock_sock(sk); | |
481 | ||
482 | if (flags & MSG_OOB) { | |
483 | rc = -ENOTSUPP; | |
484 | goto out; | |
485 | } | |
486 | ||
487 | iov.iov_base = kaddr + offset; | |
488 | iov.iov_len = size; | |
aa563d7b | 489 | iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size); |
e8f69799 IL |
490 | rc = tls_push_data(sk, &msg_iter, size, |
491 | flags, TLS_RECORD_TYPE_DATA); | |
492 | kunmap(page); | |
493 | ||
494 | out: | |
495 | release_sock(sk); | |
496 | return rc; | |
497 | } | |
498 | ||
d80a1b9d | 499 | struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context, |
e8f69799 IL |
500 | u32 seq, u64 *p_record_sn) |
501 | { | |
502 | u64 record_sn = context->hint_record_sn; | |
503 | struct tls_record_info *info; | |
504 | ||
505 | info = context->retransmit_hint; | |
506 | if (!info || | |
507 | before(seq, info->end_seq - info->len)) { | |
508 | /* if retransmit_hint is irrelevant start | |
509 | * from the beggining of the list | |
510 | */ | |
511 | info = list_first_entry(&context->records_list, | |
512 | struct tls_record_info, list); | |
513 | record_sn = context->unacked_record_sn; | |
514 | } | |
515 | ||
516 | list_for_each_entry_from(info, &context->records_list, list) { | |
517 | if (before(seq, info->end_seq)) { | |
518 | if (!context->retransmit_hint || | |
519 | after(info->end_seq, | |
520 | context->retransmit_hint->end_seq)) { | |
521 | context->hint_record_sn = record_sn; | |
522 | context->retransmit_hint = info; | |
523 | } | |
524 | *p_record_sn = record_sn; | |
525 | return info; | |
526 | } | |
527 | record_sn++; | |
528 | } | |
529 | ||
530 | return NULL; | |
531 | } | |
532 | EXPORT_SYMBOL(tls_get_record); | |
533 | ||
534 | static int tls_device_push_pending_record(struct sock *sk, int flags) | |
535 | { | |
536 | struct iov_iter msg_iter; | |
537 | ||
aa563d7b | 538 | iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0); |
e8f69799 IL |
539 | return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA); |
540 | } | |
541 | ||
7463d3a2 BP |
542 | void tls_device_write_space(struct sock *sk, struct tls_context *ctx) |
543 | { | |
7463d3a2 BP |
544 | if (!sk->sk_write_pending && tls_is_partially_sent_record(ctx)) { |
545 | gfp_t sk_allocation = sk->sk_allocation; | |
546 | ||
547 | sk->sk_allocation = GFP_ATOMIC; | |
88c80bee | 548 | tls_push_partial_record(sk, ctx, MSG_DONTWAIT | MSG_NOSIGNAL); |
7463d3a2 BP |
549 | sk->sk_allocation = sk_allocation; |
550 | } | |
7463d3a2 BP |
551 | } |
552 | ||
4799ac81 BP |
553 | void handle_device_resync(struct sock *sk, u32 seq, u64 rcd_sn) |
554 | { | |
555 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
556 | struct net_device *netdev = tls_ctx->netdev; | |
557 | struct tls_offload_context_rx *rx_ctx; | |
558 | u32 is_req_pending; | |
559 | s64 resync_req; | |
560 | u32 req_seq; | |
561 | ||
562 | if (tls_ctx->rx_conf != TLS_HW) | |
563 | return; | |
564 | ||
565 | rx_ctx = tls_offload_ctx_rx(tls_ctx); | |
566 | resync_req = atomic64_read(&rx_ctx->resync_req); | |
63a1c95f | 567 | req_seq = (resync_req >> 32) - ((u32)TLS_HEADER_SIZE - 1); |
4799ac81 BP |
568 | is_req_pending = resync_req; |
569 | ||
570 | if (unlikely(is_req_pending) && req_seq == seq && | |
571 | atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0)) | |
572 | netdev->tlsdev_ops->tls_dev_resync_rx(netdev, sk, | |
573 | seq + TLS_HEADER_SIZE - 1, | |
574 | rcd_sn); | |
575 | } | |
576 | ||
577 | static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb) | |
578 | { | |
579 | struct strp_msg *rxm = strp_msg(skb); | |
eb3d38d5 | 580 | int err = 0, offset = rxm->offset, copy, nsg, data_len, pos; |
4799ac81 BP |
581 | struct sk_buff *skb_iter, *unused; |
582 | struct scatterlist sg[1]; | |
583 | char *orig_buf, *buf; | |
584 | ||
585 | orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE + | |
586 | TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation); | |
587 | if (!orig_buf) | |
588 | return -ENOMEM; | |
589 | buf = orig_buf; | |
590 | ||
591 | nsg = skb_cow_data(skb, 0, &unused); | |
592 | if (unlikely(nsg < 0)) { | |
593 | err = nsg; | |
594 | goto free_buf; | |
595 | } | |
596 | ||
597 | sg_init_table(sg, 1); | |
598 | sg_set_buf(&sg[0], buf, | |
599 | rxm->full_len + TLS_HEADER_SIZE + | |
600 | TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
601 | skb_copy_bits(skb, offset, buf, | |
602 | TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
603 | ||
604 | /* We are interested only in the decrypted data not the auth */ | |
605 | err = decrypt_skb(sk, skb, sg); | |
606 | if (err != -EBADMSG) | |
607 | goto free_buf; | |
608 | else | |
609 | err = 0; | |
610 | ||
eb3d38d5 | 611 | data_len = rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE; |
4799ac81 | 612 | |
97e1caa5 | 613 | if (skb_pagelen(skb) > offset) { |
eb3d38d5 | 614 | copy = min_t(int, skb_pagelen(skb) - offset, data_len); |
4799ac81 | 615 | |
97e1caa5 JK |
616 | if (skb->decrypted) |
617 | skb_store_bits(skb, offset, buf, copy); | |
4799ac81 | 618 | |
97e1caa5 JK |
619 | offset += copy; |
620 | buf += copy; | |
621 | } | |
4799ac81 | 622 | |
eb3d38d5 | 623 | pos = skb_pagelen(skb); |
4799ac81 | 624 | skb_walk_frags(skb, skb_iter) { |
eb3d38d5 JK |
625 | int frag_pos; |
626 | ||
627 | /* Practically all frags must belong to msg if reencrypt | |
628 | * is needed with current strparser and coalescing logic, | |
629 | * but strparser may "get optimized", so let's be safe. | |
630 | */ | |
631 | if (pos + skb_iter->len <= offset) | |
632 | goto done_with_frag; | |
633 | if (pos >= data_len + rxm->offset) | |
634 | break; | |
635 | ||
636 | frag_pos = offset - pos; | |
637 | copy = min_t(int, skb_iter->len - frag_pos, | |
638 | data_len + rxm->offset - offset); | |
4799ac81 BP |
639 | |
640 | if (skb_iter->decrypted) | |
eb3d38d5 | 641 | skb_store_bits(skb_iter, frag_pos, buf, copy); |
4799ac81 BP |
642 | |
643 | offset += copy; | |
644 | buf += copy; | |
eb3d38d5 JK |
645 | done_with_frag: |
646 | pos += skb_iter->len; | |
4799ac81 BP |
647 | } |
648 | ||
649 | free_buf: | |
650 | kfree(orig_buf); | |
651 | return err; | |
652 | } | |
653 | ||
654 | int tls_device_decrypted(struct sock *sk, struct sk_buff *skb) | |
655 | { | |
656 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
657 | struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx); | |
658 | int is_decrypted = skb->decrypted; | |
659 | int is_encrypted = !is_decrypted; | |
660 | struct sk_buff *skb_iter; | |
661 | ||
662 | /* Skip if it is already decrypted */ | |
663 | if (ctx->sw.decrypted) | |
664 | return 0; | |
665 | ||
666 | /* Check if all the data is decrypted already */ | |
667 | skb_walk_frags(skb, skb_iter) { | |
668 | is_decrypted &= skb_iter->decrypted; | |
669 | is_encrypted &= !skb_iter->decrypted; | |
670 | } | |
671 | ||
672 | ctx->sw.decrypted |= is_decrypted; | |
673 | ||
674 | /* Return immedeatly if the record is either entirely plaintext or | |
675 | * entirely ciphertext. Otherwise handle reencrypt partially decrypted | |
676 | * record. | |
677 | */ | |
678 | return (is_encrypted || is_decrypted) ? 0 : | |
679 | tls_device_reencrypt(sk, skb); | |
680 | } | |
681 | ||
9e995797 JK |
682 | static void tls_device_attach(struct tls_context *ctx, struct sock *sk, |
683 | struct net_device *netdev) | |
684 | { | |
685 | if (sk->sk_destruct != tls_device_sk_destruct) { | |
686 | refcount_set(&ctx->refcount, 1); | |
687 | dev_hold(netdev); | |
688 | ctx->netdev = netdev; | |
689 | spin_lock_irq(&tls_device_lock); | |
690 | list_add_tail(&ctx->list, &tls_device_list); | |
691 | spin_unlock_irq(&tls_device_lock); | |
692 | ||
693 | ctx->sk_destruct = sk->sk_destruct; | |
694 | sk->sk_destruct = tls_device_sk_destruct; | |
695 | } | |
696 | } | |
697 | ||
e8f69799 IL |
698 | int tls_set_device_offload(struct sock *sk, struct tls_context *ctx) |
699 | { | |
700 | u16 nonce_size, tag_size, iv_size, rec_seq_size; | |
4509de14 VG |
701 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
702 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
e8f69799 | 703 | struct tls_record_info *start_marker_record; |
d80a1b9d | 704 | struct tls_offload_context_tx *offload_ctx; |
e8f69799 IL |
705 | struct tls_crypto_info *crypto_info; |
706 | struct net_device *netdev; | |
707 | char *iv, *rec_seq; | |
708 | struct sk_buff *skb; | |
709 | int rc = -EINVAL; | |
710 | __be64 rcd_sn; | |
711 | ||
712 | if (!ctx) | |
713 | goto out; | |
714 | ||
715 | if (ctx->priv_ctx_tx) { | |
716 | rc = -EEXIST; | |
717 | goto out; | |
718 | } | |
719 | ||
720 | start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL); | |
721 | if (!start_marker_record) { | |
722 | rc = -ENOMEM; | |
723 | goto out; | |
724 | } | |
725 | ||
d80a1b9d | 726 | offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL); |
e8f69799 IL |
727 | if (!offload_ctx) { |
728 | rc = -ENOMEM; | |
729 | goto free_marker_record; | |
730 | } | |
731 | ||
86029d10 | 732 | crypto_info = &ctx->crypto_send.info; |
e8f69799 IL |
733 | switch (crypto_info->cipher_type) { |
734 | case TLS_CIPHER_AES_GCM_128: | |
735 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
736 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
737 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
738 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; | |
739 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; | |
740 | rec_seq = | |
741 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; | |
742 | break; | |
743 | default: | |
744 | rc = -EINVAL; | |
745 | goto free_offload_ctx; | |
746 | } | |
747 | ||
4509de14 VG |
748 | prot->prepend_size = TLS_HEADER_SIZE + nonce_size; |
749 | prot->tag_size = tag_size; | |
750 | prot->overhead_size = prot->prepend_size + prot->tag_size; | |
751 | prot->iv_size = iv_size; | |
e8f69799 IL |
752 | ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
753 | GFP_KERNEL); | |
754 | if (!ctx->tx.iv) { | |
755 | rc = -ENOMEM; | |
756 | goto free_offload_ctx; | |
757 | } | |
758 | ||
759 | memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size); | |
760 | ||
4509de14 | 761 | prot->rec_seq_size = rec_seq_size; |
969d5090 | 762 | ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); |
e8f69799 IL |
763 | if (!ctx->tx.rec_seq) { |
764 | rc = -ENOMEM; | |
765 | goto free_iv; | |
766 | } | |
e8f69799 IL |
767 | |
768 | rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info); | |
769 | if (rc) | |
770 | goto free_rec_seq; | |
771 | ||
772 | /* start at rec_seq - 1 to account for the start marker record */ | |
773 | memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn)); | |
774 | offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1; | |
775 | ||
776 | start_marker_record->end_seq = tcp_sk(sk)->write_seq; | |
777 | start_marker_record->len = 0; | |
778 | start_marker_record->num_frags = 0; | |
779 | ||
780 | INIT_LIST_HEAD(&offload_ctx->records_list); | |
781 | list_add_tail(&start_marker_record->list, &offload_ctx->records_list); | |
782 | spin_lock_init(&offload_ctx->lock); | |
895262d8 BP |
783 | sg_init_table(offload_ctx->sg_tx_data, |
784 | ARRAY_SIZE(offload_ctx->sg_tx_data)); | |
e8f69799 IL |
785 | |
786 | clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked); | |
787 | ctx->push_pending_record = tls_device_push_pending_record; | |
e8f69799 IL |
788 | |
789 | /* TLS offload is greatly simplified if we don't send | |
790 | * SKBs where only part of the payload needs to be encrypted. | |
791 | * So mark the last skb in the write queue as end of record. | |
792 | */ | |
793 | skb = tcp_write_queue_tail(sk); | |
794 | if (skb) | |
795 | TCP_SKB_CB(skb)->eor = 1; | |
796 | ||
e8f69799 IL |
797 | /* We support starting offload on multiple sockets |
798 | * concurrently, so we only need a read lock here. | |
799 | * This lock must precede get_netdev_for_sock to prevent races between | |
800 | * NETDEV_DOWN and setsockopt. | |
801 | */ | |
802 | down_read(&device_offload_lock); | |
803 | netdev = get_netdev_for_sock(sk); | |
804 | if (!netdev) { | |
805 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
806 | rc = -EINVAL; | |
807 | goto release_lock; | |
808 | } | |
809 | ||
810 | if (!(netdev->features & NETIF_F_HW_TLS_TX)) { | |
811 | rc = -ENOTSUPP; | |
812 | goto release_netdev; | |
813 | } | |
814 | ||
815 | /* Avoid offloading if the device is down | |
816 | * We don't want to offload new flows after | |
817 | * the NETDEV_DOWN event | |
818 | */ | |
819 | if (!(netdev->flags & IFF_UP)) { | |
820 | rc = -EINVAL; | |
821 | goto release_netdev; | |
822 | } | |
823 | ||
824 | ctx->priv_ctx_tx = offload_ctx; | |
825 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX, | |
86029d10 | 826 | &ctx->crypto_send.info, |
e8f69799 IL |
827 | tcp_sk(sk)->write_seq); |
828 | if (rc) | |
829 | goto release_netdev; | |
830 | ||
4799ac81 | 831 | tls_device_attach(ctx, sk, netdev); |
e8f69799 | 832 | |
e8f69799 IL |
833 | /* following this assignment tls_is_sk_tx_device_offloaded |
834 | * will return true and the context might be accessed | |
835 | * by the netdev's xmit function. | |
836 | */ | |
4799ac81 BP |
837 | smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb); |
838 | dev_put(netdev); | |
e8f69799 IL |
839 | up_read(&device_offload_lock); |
840 | goto out; | |
841 | ||
842 | release_netdev: | |
843 | dev_put(netdev); | |
844 | release_lock: | |
845 | up_read(&device_offload_lock); | |
846 | clean_acked_data_disable(inet_csk(sk)); | |
847 | crypto_free_aead(offload_ctx->aead_send); | |
848 | free_rec_seq: | |
849 | kfree(ctx->tx.rec_seq); | |
850 | free_iv: | |
851 | kfree(ctx->tx.iv); | |
852 | free_offload_ctx: | |
853 | kfree(offload_ctx); | |
854 | ctx->priv_ctx_tx = NULL; | |
855 | free_marker_record: | |
856 | kfree(start_marker_record); | |
857 | out: | |
858 | return rc; | |
859 | } | |
860 | ||
4799ac81 BP |
861 | int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx) |
862 | { | |
863 | struct tls_offload_context_rx *context; | |
864 | struct net_device *netdev; | |
865 | int rc = 0; | |
866 | ||
867 | /* We support starting offload on multiple sockets | |
868 | * concurrently, so we only need a read lock here. | |
869 | * This lock must precede get_netdev_for_sock to prevent races between | |
870 | * NETDEV_DOWN and setsockopt. | |
871 | */ | |
872 | down_read(&device_offload_lock); | |
873 | netdev = get_netdev_for_sock(sk); | |
874 | if (!netdev) { | |
875 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
876 | rc = -EINVAL; | |
877 | goto release_lock; | |
878 | } | |
879 | ||
880 | if (!(netdev->features & NETIF_F_HW_TLS_RX)) { | |
4799ac81 BP |
881 | rc = -ENOTSUPP; |
882 | goto release_netdev; | |
883 | } | |
884 | ||
885 | /* Avoid offloading if the device is down | |
886 | * We don't want to offload new flows after | |
887 | * the NETDEV_DOWN event | |
888 | */ | |
889 | if (!(netdev->flags & IFF_UP)) { | |
890 | rc = -EINVAL; | |
891 | goto release_netdev; | |
892 | } | |
893 | ||
894 | context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL); | |
895 | if (!context) { | |
896 | rc = -ENOMEM; | |
897 | goto release_netdev; | |
898 | } | |
899 | ||
900 | ctx->priv_ctx_rx = context; | |
901 | rc = tls_set_sw_offload(sk, ctx, 0); | |
902 | if (rc) | |
903 | goto release_ctx; | |
904 | ||
905 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX, | |
86029d10 | 906 | &ctx->crypto_recv.info, |
4799ac81 | 907 | tcp_sk(sk)->copied_seq); |
e49d268d | 908 | if (rc) |
4799ac81 | 909 | goto free_sw_resources; |
4799ac81 BP |
910 | |
911 | tls_device_attach(ctx, sk, netdev); | |
912 | goto release_netdev; | |
913 | ||
914 | free_sw_resources: | |
62ef81d5 | 915 | up_read(&device_offload_lock); |
4799ac81 | 916 | tls_sw_free_resources_rx(sk); |
62ef81d5 | 917 | down_read(&device_offload_lock); |
4799ac81 BP |
918 | release_ctx: |
919 | ctx->priv_ctx_rx = NULL; | |
920 | release_netdev: | |
921 | dev_put(netdev); | |
922 | release_lock: | |
923 | up_read(&device_offload_lock); | |
924 | return rc; | |
925 | } | |
926 | ||
927 | void tls_device_offload_cleanup_rx(struct sock *sk) | |
928 | { | |
929 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
930 | struct net_device *netdev; | |
931 | ||
932 | down_read(&device_offload_lock); | |
933 | netdev = tls_ctx->netdev; | |
934 | if (!netdev) | |
935 | goto out; | |
936 | ||
937 | if (!(netdev->features & NETIF_F_HW_TLS_RX)) { | |
938 | pr_err_ratelimited("%s: device is missing NETIF_F_HW_TLS_RX cap\n", | |
939 | __func__); | |
940 | goto out; | |
941 | } | |
942 | ||
943 | netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx, | |
944 | TLS_OFFLOAD_CTX_DIR_RX); | |
945 | ||
946 | if (tls_ctx->tx_conf != TLS_HW) { | |
947 | dev_put(netdev); | |
948 | tls_ctx->netdev = NULL; | |
949 | } | |
950 | out: | |
951 | up_read(&device_offload_lock); | |
4799ac81 BP |
952 | tls_sw_release_resources_rx(sk); |
953 | } | |
954 | ||
e8f69799 IL |
955 | static int tls_device_down(struct net_device *netdev) |
956 | { | |
957 | struct tls_context *ctx, *tmp; | |
958 | unsigned long flags; | |
959 | LIST_HEAD(list); | |
960 | ||
961 | /* Request a write lock to block new offload attempts */ | |
962 | down_write(&device_offload_lock); | |
963 | ||
964 | spin_lock_irqsave(&tls_device_lock, flags); | |
965 | list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) { | |
966 | if (ctx->netdev != netdev || | |
967 | !refcount_inc_not_zero(&ctx->refcount)) | |
968 | continue; | |
969 | ||
970 | list_move(&ctx->list, &list); | |
971 | } | |
972 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
973 | ||
974 | list_for_each_entry_safe(ctx, tmp, &list, list) { | |
4799ac81 BP |
975 | if (ctx->tx_conf == TLS_HW) |
976 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
977 | TLS_OFFLOAD_CTX_DIR_TX); | |
978 | if (ctx->rx_conf == TLS_HW) | |
979 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
980 | TLS_OFFLOAD_CTX_DIR_RX); | |
e8f69799 IL |
981 | ctx->netdev = NULL; |
982 | dev_put(netdev); | |
983 | list_del_init(&ctx->list); | |
984 | ||
985 | if (refcount_dec_and_test(&ctx->refcount)) | |
986 | tls_device_free_ctx(ctx); | |
987 | } | |
988 | ||
989 | up_write(&device_offload_lock); | |
990 | ||
991 | flush_work(&tls_device_gc_work); | |
992 | ||
993 | return NOTIFY_DONE; | |
994 | } | |
995 | ||
996 | static int tls_dev_event(struct notifier_block *this, unsigned long event, | |
997 | void *ptr) | |
998 | { | |
999 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1000 | ||
4799ac81 | 1001 | if (!(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX))) |
e8f69799 IL |
1002 | return NOTIFY_DONE; |
1003 | ||
1004 | switch (event) { | |
1005 | case NETDEV_REGISTER: | |
1006 | case NETDEV_FEAT_CHANGE: | |
4799ac81 BP |
1007 | if ((dev->features & NETIF_F_HW_TLS_RX) && |
1008 | !dev->tlsdev_ops->tls_dev_resync_rx) | |
1009 | return NOTIFY_BAD; | |
1010 | ||
e8f69799 IL |
1011 | if (dev->tlsdev_ops && |
1012 | dev->tlsdev_ops->tls_dev_add && | |
1013 | dev->tlsdev_ops->tls_dev_del) | |
1014 | return NOTIFY_DONE; | |
1015 | else | |
1016 | return NOTIFY_BAD; | |
1017 | case NETDEV_DOWN: | |
1018 | return tls_device_down(dev); | |
1019 | } | |
1020 | return NOTIFY_DONE; | |
1021 | } | |
1022 | ||
1023 | static struct notifier_block tls_dev_notifier = { | |
1024 | .notifier_call = tls_dev_event, | |
1025 | }; | |
1026 | ||
1027 | void __init tls_device_init(void) | |
1028 | { | |
1029 | register_netdevice_notifier(&tls_dev_notifier); | |
1030 | } | |
1031 | ||
1032 | void __exit tls_device_cleanup(void) | |
1033 | { | |
1034 | unregister_netdevice_notifier(&tls_dev_notifier); | |
1035 | flush_work(&tls_device_gc_work); | |
494bc1d2 | 1036 | clean_acked_data_flush(); |
e8f69799 | 1037 | } |