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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 | ||
4799ac81 BP |
92 | static void tls_device_attach(struct tls_context *ctx, struct sock *sk, |
93 | struct net_device *netdev) | |
94 | { | |
95 | if (sk->sk_destruct != tls_device_sk_destruct) { | |
96 | refcount_set(&ctx->refcount, 1); | |
97 | dev_hold(netdev); | |
98 | ctx->netdev = netdev; | |
99 | spin_lock_irq(&tls_device_lock); | |
100 | list_add_tail(&ctx->list, &tls_device_list); | |
101 | spin_unlock_irq(&tls_device_lock); | |
102 | ||
103 | ctx->sk_destruct = sk->sk_destruct; | |
104 | sk->sk_destruct = tls_device_sk_destruct; | |
105 | } | |
106 | } | |
107 | ||
e8f69799 IL |
108 | static void tls_device_queue_ctx_destruction(struct tls_context *ctx) |
109 | { | |
110 | unsigned long flags; | |
111 | ||
112 | spin_lock_irqsave(&tls_device_lock, flags); | |
113 | list_move_tail(&ctx->list, &tls_device_gc_list); | |
114 | ||
115 | /* schedule_work inside the spinlock | |
116 | * to make sure tls_device_down waits for that work. | |
117 | */ | |
118 | schedule_work(&tls_device_gc_work); | |
119 | ||
120 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
121 | } | |
122 | ||
123 | /* We assume that the socket is already connected */ | |
124 | static struct net_device *get_netdev_for_sock(struct sock *sk) | |
125 | { | |
126 | struct dst_entry *dst = sk_dst_get(sk); | |
127 | struct net_device *netdev = NULL; | |
128 | ||
129 | if (likely(dst)) { | |
130 | netdev = dst->dev; | |
131 | dev_hold(netdev); | |
132 | } | |
133 | ||
134 | dst_release(dst); | |
135 | ||
136 | return netdev; | |
137 | } | |
138 | ||
139 | static void destroy_record(struct tls_record_info *record) | |
140 | { | |
141 | int nr_frags = record->num_frags; | |
142 | skb_frag_t *frag; | |
143 | ||
144 | while (nr_frags-- > 0) { | |
145 | frag = &record->frags[nr_frags]; | |
146 | __skb_frag_unref(frag); | |
147 | } | |
148 | kfree(record); | |
149 | } | |
150 | ||
d80a1b9d | 151 | static void delete_all_records(struct tls_offload_context_tx *offload_ctx) |
e8f69799 IL |
152 | { |
153 | struct tls_record_info *info, *temp; | |
154 | ||
155 | list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) { | |
156 | list_del(&info->list); | |
157 | destroy_record(info); | |
158 | } | |
159 | ||
160 | offload_ctx->retransmit_hint = NULL; | |
161 | } | |
162 | ||
163 | static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq) | |
164 | { | |
165 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
166 | struct tls_record_info *info, *temp; | |
d80a1b9d | 167 | struct tls_offload_context_tx *ctx; |
e8f69799 IL |
168 | u64 deleted_records = 0; |
169 | unsigned long flags; | |
170 | ||
171 | if (!tls_ctx) | |
172 | return; | |
173 | ||
d80a1b9d | 174 | ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 IL |
175 | |
176 | spin_lock_irqsave(&ctx->lock, flags); | |
177 | info = ctx->retransmit_hint; | |
178 | if (info && !before(acked_seq, info->end_seq)) { | |
179 | ctx->retransmit_hint = NULL; | |
180 | list_del(&info->list); | |
181 | destroy_record(info); | |
182 | deleted_records++; | |
183 | } | |
184 | ||
185 | list_for_each_entry_safe(info, temp, &ctx->records_list, list) { | |
186 | if (before(acked_seq, info->end_seq)) | |
187 | break; | |
188 | list_del(&info->list); | |
189 | ||
190 | destroy_record(info); | |
191 | deleted_records++; | |
192 | } | |
193 | ||
194 | ctx->unacked_record_sn += deleted_records; | |
195 | spin_unlock_irqrestore(&ctx->lock, flags); | |
196 | } | |
197 | ||
198 | /* At this point, there should be no references on this | |
199 | * socket and no in-flight SKBs associated with this | |
200 | * socket, so it is safe to free all the resources. | |
201 | */ | |
202 | void tls_device_sk_destruct(struct sock *sk) | |
203 | { | |
204 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
d80a1b9d | 205 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 | 206 | |
4799ac81 | 207 | tls_ctx->sk_destruct(sk); |
e8f69799 | 208 | |
4799ac81 BP |
209 | if (tls_ctx->tx_conf == TLS_HW) { |
210 | if (ctx->open_record) | |
211 | destroy_record(ctx->open_record); | |
212 | delete_all_records(ctx); | |
213 | crypto_free_aead(ctx->aead_send); | |
214 | clean_acked_data_disable(inet_csk(sk)); | |
215 | } | |
e8f69799 IL |
216 | |
217 | if (refcount_dec_and_test(&tls_ctx->refcount)) | |
218 | tls_device_queue_ctx_destruction(tls_ctx); | |
219 | } | |
220 | EXPORT_SYMBOL(tls_device_sk_destruct); | |
221 | ||
222 | static void tls_append_frag(struct tls_record_info *record, | |
223 | struct page_frag *pfrag, | |
224 | int size) | |
225 | { | |
226 | skb_frag_t *frag; | |
227 | ||
228 | frag = &record->frags[record->num_frags - 1]; | |
229 | if (frag->page.p == pfrag->page && | |
230 | frag->page_offset + frag->size == pfrag->offset) { | |
231 | frag->size += size; | |
232 | } else { | |
233 | ++frag; | |
234 | frag->page.p = pfrag->page; | |
235 | frag->page_offset = pfrag->offset; | |
236 | frag->size = size; | |
237 | ++record->num_frags; | |
238 | get_page(pfrag->page); | |
239 | } | |
240 | ||
241 | pfrag->offset += size; | |
242 | record->len += size; | |
243 | } | |
244 | ||
245 | static int tls_push_record(struct sock *sk, | |
246 | struct tls_context *ctx, | |
d80a1b9d | 247 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
248 | struct tls_record_info *record, |
249 | struct page_frag *pfrag, | |
250 | int flags, | |
251 | unsigned char record_type) | |
252 | { | |
4509de14 | 253 | struct tls_prot_info *prot = &ctx->prot_info; |
e8f69799 IL |
254 | struct tcp_sock *tp = tcp_sk(sk); |
255 | struct page_frag dummy_tag_frag; | |
256 | skb_frag_t *frag; | |
257 | int i; | |
258 | ||
259 | /* fill prepend */ | |
260 | frag = &record->frags[0]; | |
261 | tls_fill_prepend(ctx, | |
262 | skb_frag_address(frag), | |
4509de14 | 263 | record->len - prot->prepend_size, |
130b392c DW |
264 | record_type, |
265 | ctx->crypto_send.info.version); | |
e8f69799 IL |
266 | |
267 | /* HW doesn't care about the data in the tag, because it fills it. */ | |
268 | dummy_tag_frag.page = skb_frag_page(frag); | |
269 | dummy_tag_frag.offset = 0; | |
270 | ||
4509de14 | 271 | tls_append_frag(record, &dummy_tag_frag, prot->tag_size); |
e8f69799 IL |
272 | record->end_seq = tp->write_seq + record->len; |
273 | spin_lock_irq(&offload_ctx->lock); | |
274 | list_add_tail(&record->list, &offload_ctx->records_list); | |
275 | spin_unlock_irq(&offload_ctx->lock); | |
276 | offload_ctx->open_record = NULL; | |
130b392c | 277 | tls_advance_record_sn(sk, &ctx->tx, ctx->crypto_send.info.version); |
e8f69799 IL |
278 | |
279 | for (i = 0; i < record->num_frags; i++) { | |
280 | frag = &record->frags[i]; | |
281 | sg_unmark_end(&offload_ctx->sg_tx_data[i]); | |
282 | sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag), | |
283 | frag->size, frag->page_offset); | |
284 | sk_mem_charge(sk, frag->size); | |
285 | get_page(skb_frag_page(frag)); | |
286 | } | |
287 | sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]); | |
288 | ||
289 | /* all ready, send */ | |
290 | return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags); | |
291 | } | |
292 | ||
d80a1b9d | 293 | static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
294 | struct page_frag *pfrag, |
295 | size_t prepend_size) | |
296 | { | |
297 | struct tls_record_info *record; | |
298 | skb_frag_t *frag; | |
299 | ||
300 | record = kmalloc(sizeof(*record), GFP_KERNEL); | |
301 | if (!record) | |
302 | return -ENOMEM; | |
303 | ||
304 | frag = &record->frags[0]; | |
305 | __skb_frag_set_page(frag, pfrag->page); | |
306 | frag->page_offset = pfrag->offset; | |
307 | skb_frag_size_set(frag, prepend_size); | |
308 | ||
309 | get_page(pfrag->page); | |
310 | pfrag->offset += prepend_size; | |
311 | ||
312 | record->num_frags = 1; | |
313 | record->len = prepend_size; | |
314 | offload_ctx->open_record = record; | |
315 | return 0; | |
316 | } | |
317 | ||
318 | static int tls_do_allocation(struct sock *sk, | |
d80a1b9d | 319 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
320 | struct page_frag *pfrag, |
321 | size_t prepend_size) | |
322 | { | |
323 | int ret; | |
324 | ||
325 | if (!offload_ctx->open_record) { | |
326 | if (unlikely(!skb_page_frag_refill(prepend_size, pfrag, | |
327 | sk->sk_allocation))) { | |
328 | sk->sk_prot->enter_memory_pressure(sk); | |
329 | sk_stream_moderate_sndbuf(sk); | |
330 | return -ENOMEM; | |
331 | } | |
332 | ||
333 | ret = tls_create_new_record(offload_ctx, pfrag, prepend_size); | |
334 | if (ret) | |
335 | return ret; | |
336 | ||
337 | if (pfrag->size > pfrag->offset) | |
338 | return 0; | |
339 | } | |
340 | ||
341 | if (!sk_page_frag_refill(sk, pfrag)) | |
342 | return -ENOMEM; | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | static int tls_push_data(struct sock *sk, | |
348 | struct iov_iter *msg_iter, | |
349 | size_t size, int flags, | |
350 | unsigned char record_type) | |
351 | { | |
352 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 353 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
d80a1b9d | 354 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 IL |
355 | int tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST; |
356 | int more = flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE); | |
357 | struct tls_record_info *record = ctx->open_record; | |
358 | struct page_frag *pfrag; | |
359 | size_t orig_size = size; | |
360 | u32 max_open_record_len; | |
361 | int copy, rc = 0; | |
362 | bool done = false; | |
363 | long timeo; | |
364 | ||
365 | if (flags & | |
366 | ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST)) | |
367 | return -ENOTSUPP; | |
368 | ||
369 | if (sk->sk_err) | |
370 | return -sk->sk_err; | |
371 | ||
372 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); | |
94850257 BP |
373 | if (tls_is_partially_sent_record(tls_ctx)) { |
374 | rc = tls_push_partial_record(sk, tls_ctx, flags); | |
375 | if (rc < 0) | |
376 | return rc; | |
377 | } | |
e8f69799 IL |
378 | |
379 | pfrag = sk_page_frag(sk); | |
380 | ||
381 | /* TLS_HEADER_SIZE is not counted as part of the TLS record, and | |
382 | * we need to leave room for an authentication tag. | |
383 | */ | |
384 | max_open_record_len = TLS_MAX_PAYLOAD_SIZE + | |
4509de14 | 385 | prot->prepend_size; |
e8f69799 IL |
386 | do { |
387 | rc = tls_do_allocation(sk, ctx, pfrag, | |
4509de14 | 388 | prot->prepend_size); |
e8f69799 IL |
389 | if (rc) { |
390 | rc = sk_stream_wait_memory(sk, &timeo); | |
391 | if (!rc) | |
392 | continue; | |
393 | ||
394 | record = ctx->open_record; | |
395 | if (!record) | |
396 | break; | |
397 | handle_error: | |
398 | if (record_type != TLS_RECORD_TYPE_DATA) { | |
399 | /* avoid sending partial | |
400 | * record with type != | |
401 | * application_data | |
402 | */ | |
403 | size = orig_size; | |
404 | destroy_record(record); | |
405 | ctx->open_record = NULL; | |
4509de14 | 406 | } else if (record->len > prot->prepend_size) { |
e8f69799 IL |
407 | goto last_record; |
408 | } | |
409 | ||
410 | break; | |
411 | } | |
412 | ||
413 | record = ctx->open_record; | |
414 | copy = min_t(size_t, size, (pfrag->size - pfrag->offset)); | |
415 | copy = min_t(size_t, copy, (max_open_record_len - record->len)); | |
416 | ||
417 | if (copy_from_iter_nocache(page_address(pfrag->page) + | |
418 | pfrag->offset, | |
419 | copy, msg_iter) != copy) { | |
420 | rc = -EFAULT; | |
421 | goto handle_error; | |
422 | } | |
423 | tls_append_frag(record, pfrag, copy); | |
424 | ||
425 | size -= copy; | |
426 | if (!size) { | |
427 | last_record: | |
428 | tls_push_record_flags = flags; | |
429 | if (more) { | |
430 | tls_ctx->pending_open_record_frags = | |
d829e9c4 | 431 | !!record->num_frags; |
e8f69799 IL |
432 | break; |
433 | } | |
434 | ||
435 | done = true; | |
436 | } | |
437 | ||
438 | if (done || record->len >= max_open_record_len || | |
439 | (record->num_frags >= MAX_SKB_FRAGS - 1)) { | |
440 | rc = tls_push_record(sk, | |
441 | tls_ctx, | |
442 | ctx, | |
443 | record, | |
444 | pfrag, | |
445 | tls_push_record_flags, | |
446 | record_type); | |
447 | if (rc < 0) | |
448 | break; | |
449 | } | |
450 | } while (!done); | |
451 | ||
452 | if (orig_size - size > 0) | |
453 | rc = orig_size - size; | |
454 | ||
455 | return rc; | |
456 | } | |
457 | ||
458 | int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
459 | { | |
460 | unsigned char record_type = TLS_RECORD_TYPE_DATA; | |
461 | int rc; | |
462 | ||
463 | lock_sock(sk); | |
464 | ||
465 | if (unlikely(msg->msg_controllen)) { | |
466 | rc = tls_proccess_cmsg(sk, msg, &record_type); | |
467 | if (rc) | |
468 | goto out; | |
469 | } | |
470 | ||
471 | rc = tls_push_data(sk, &msg->msg_iter, size, | |
472 | msg->msg_flags, record_type); | |
473 | ||
474 | out: | |
475 | release_sock(sk); | |
476 | return rc; | |
477 | } | |
478 | ||
479 | int tls_device_sendpage(struct sock *sk, struct page *page, | |
480 | int offset, size_t size, int flags) | |
481 | { | |
482 | struct iov_iter msg_iter; | |
483 | char *kaddr = kmap(page); | |
484 | struct kvec iov; | |
485 | int rc; | |
486 | ||
487 | if (flags & MSG_SENDPAGE_NOTLAST) | |
488 | flags |= MSG_MORE; | |
489 | ||
490 | lock_sock(sk); | |
491 | ||
492 | if (flags & MSG_OOB) { | |
493 | rc = -ENOTSUPP; | |
494 | goto out; | |
495 | } | |
496 | ||
497 | iov.iov_base = kaddr + offset; | |
498 | iov.iov_len = size; | |
aa563d7b | 499 | iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size); |
e8f69799 IL |
500 | rc = tls_push_data(sk, &msg_iter, size, |
501 | flags, TLS_RECORD_TYPE_DATA); | |
502 | kunmap(page); | |
503 | ||
504 | out: | |
505 | release_sock(sk); | |
506 | return rc; | |
507 | } | |
508 | ||
d80a1b9d | 509 | struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context, |
e8f69799 IL |
510 | u32 seq, u64 *p_record_sn) |
511 | { | |
512 | u64 record_sn = context->hint_record_sn; | |
513 | struct tls_record_info *info; | |
514 | ||
515 | info = context->retransmit_hint; | |
516 | if (!info || | |
517 | before(seq, info->end_seq - info->len)) { | |
518 | /* if retransmit_hint is irrelevant start | |
519 | * from the beggining of the list | |
520 | */ | |
521 | info = list_first_entry(&context->records_list, | |
522 | struct tls_record_info, list); | |
523 | record_sn = context->unacked_record_sn; | |
524 | } | |
525 | ||
526 | list_for_each_entry_from(info, &context->records_list, list) { | |
527 | if (before(seq, info->end_seq)) { | |
528 | if (!context->retransmit_hint || | |
529 | after(info->end_seq, | |
530 | context->retransmit_hint->end_seq)) { | |
531 | context->hint_record_sn = record_sn; | |
532 | context->retransmit_hint = info; | |
533 | } | |
534 | *p_record_sn = record_sn; | |
535 | return info; | |
536 | } | |
537 | record_sn++; | |
538 | } | |
539 | ||
540 | return NULL; | |
541 | } | |
542 | EXPORT_SYMBOL(tls_get_record); | |
543 | ||
544 | static int tls_device_push_pending_record(struct sock *sk, int flags) | |
545 | { | |
546 | struct iov_iter msg_iter; | |
547 | ||
aa563d7b | 548 | iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0); |
e8f69799 IL |
549 | return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA); |
550 | } | |
551 | ||
7463d3a2 BP |
552 | void tls_device_write_space(struct sock *sk, struct tls_context *ctx) |
553 | { | |
554 | int rc = 0; | |
555 | ||
556 | if (!sk->sk_write_pending && tls_is_partially_sent_record(ctx)) { | |
557 | gfp_t sk_allocation = sk->sk_allocation; | |
558 | ||
559 | sk->sk_allocation = GFP_ATOMIC; | |
560 | rc = tls_push_partial_record(sk, ctx, | |
561 | MSG_DONTWAIT | MSG_NOSIGNAL); | |
562 | sk->sk_allocation = sk_allocation; | |
563 | } | |
7463d3a2 BP |
564 | } |
565 | ||
4799ac81 BP |
566 | void handle_device_resync(struct sock *sk, u32 seq, u64 rcd_sn) |
567 | { | |
568 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
569 | struct net_device *netdev = tls_ctx->netdev; | |
570 | struct tls_offload_context_rx *rx_ctx; | |
571 | u32 is_req_pending; | |
572 | s64 resync_req; | |
573 | u32 req_seq; | |
574 | ||
575 | if (tls_ctx->rx_conf != TLS_HW) | |
576 | return; | |
577 | ||
578 | rx_ctx = tls_offload_ctx_rx(tls_ctx); | |
579 | resync_req = atomic64_read(&rx_ctx->resync_req); | |
580 | req_seq = ntohl(resync_req >> 32) - ((u32)TLS_HEADER_SIZE - 1); | |
581 | is_req_pending = resync_req; | |
582 | ||
583 | if (unlikely(is_req_pending) && req_seq == seq && | |
584 | atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0)) | |
585 | netdev->tlsdev_ops->tls_dev_resync_rx(netdev, sk, | |
586 | seq + TLS_HEADER_SIZE - 1, | |
587 | rcd_sn); | |
588 | } | |
589 | ||
590 | static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb) | |
591 | { | |
592 | struct strp_msg *rxm = strp_msg(skb); | |
593 | int err = 0, offset = rxm->offset, copy, nsg; | |
594 | struct sk_buff *skb_iter, *unused; | |
595 | struct scatterlist sg[1]; | |
596 | char *orig_buf, *buf; | |
597 | ||
598 | orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE + | |
599 | TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation); | |
600 | if (!orig_buf) | |
601 | return -ENOMEM; | |
602 | buf = orig_buf; | |
603 | ||
604 | nsg = skb_cow_data(skb, 0, &unused); | |
605 | if (unlikely(nsg < 0)) { | |
606 | err = nsg; | |
607 | goto free_buf; | |
608 | } | |
609 | ||
610 | sg_init_table(sg, 1); | |
611 | sg_set_buf(&sg[0], buf, | |
612 | rxm->full_len + TLS_HEADER_SIZE + | |
613 | TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
614 | skb_copy_bits(skb, offset, buf, | |
615 | TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
616 | ||
617 | /* We are interested only in the decrypted data not the auth */ | |
618 | err = decrypt_skb(sk, skb, sg); | |
619 | if (err != -EBADMSG) | |
620 | goto free_buf; | |
621 | else | |
622 | err = 0; | |
623 | ||
624 | copy = min_t(int, skb_pagelen(skb) - offset, | |
625 | rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE); | |
626 | ||
627 | if (skb->decrypted) | |
628 | skb_store_bits(skb, offset, buf, copy); | |
629 | ||
630 | offset += copy; | |
631 | buf += copy; | |
632 | ||
633 | skb_walk_frags(skb, skb_iter) { | |
634 | copy = min_t(int, skb_iter->len, | |
635 | rxm->full_len - offset + rxm->offset - | |
636 | TLS_CIPHER_AES_GCM_128_TAG_SIZE); | |
637 | ||
638 | if (skb_iter->decrypted) | |
eecd6857 | 639 | skb_store_bits(skb_iter, offset, buf, copy); |
4799ac81 BP |
640 | |
641 | offset += copy; | |
642 | buf += copy; | |
643 | } | |
644 | ||
645 | free_buf: | |
646 | kfree(orig_buf); | |
647 | return err; | |
648 | } | |
649 | ||
650 | int tls_device_decrypted(struct sock *sk, struct sk_buff *skb) | |
651 | { | |
652 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
653 | struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx); | |
654 | int is_decrypted = skb->decrypted; | |
655 | int is_encrypted = !is_decrypted; | |
656 | struct sk_buff *skb_iter; | |
657 | ||
658 | /* Skip if it is already decrypted */ | |
659 | if (ctx->sw.decrypted) | |
660 | return 0; | |
661 | ||
662 | /* Check if all the data is decrypted already */ | |
663 | skb_walk_frags(skb, skb_iter) { | |
664 | is_decrypted &= skb_iter->decrypted; | |
665 | is_encrypted &= !skb_iter->decrypted; | |
666 | } | |
667 | ||
668 | ctx->sw.decrypted |= is_decrypted; | |
669 | ||
670 | /* Return immedeatly if the record is either entirely plaintext or | |
671 | * entirely ciphertext. Otherwise handle reencrypt partially decrypted | |
672 | * record. | |
673 | */ | |
674 | return (is_encrypted || is_decrypted) ? 0 : | |
675 | tls_device_reencrypt(sk, skb); | |
676 | } | |
677 | ||
e8f69799 IL |
678 | int tls_set_device_offload(struct sock *sk, struct tls_context *ctx) |
679 | { | |
680 | u16 nonce_size, tag_size, iv_size, rec_seq_size; | |
4509de14 VG |
681 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
682 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
e8f69799 | 683 | struct tls_record_info *start_marker_record; |
d80a1b9d | 684 | struct tls_offload_context_tx *offload_ctx; |
e8f69799 IL |
685 | struct tls_crypto_info *crypto_info; |
686 | struct net_device *netdev; | |
687 | char *iv, *rec_seq; | |
688 | struct sk_buff *skb; | |
689 | int rc = -EINVAL; | |
690 | __be64 rcd_sn; | |
691 | ||
692 | if (!ctx) | |
693 | goto out; | |
694 | ||
695 | if (ctx->priv_ctx_tx) { | |
696 | rc = -EEXIST; | |
697 | goto out; | |
698 | } | |
699 | ||
700 | start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL); | |
701 | if (!start_marker_record) { | |
702 | rc = -ENOMEM; | |
703 | goto out; | |
704 | } | |
705 | ||
d80a1b9d | 706 | offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL); |
e8f69799 IL |
707 | if (!offload_ctx) { |
708 | rc = -ENOMEM; | |
709 | goto free_marker_record; | |
710 | } | |
711 | ||
86029d10 | 712 | crypto_info = &ctx->crypto_send.info; |
e8f69799 IL |
713 | switch (crypto_info->cipher_type) { |
714 | case TLS_CIPHER_AES_GCM_128: | |
715 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
716 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
717 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
718 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; | |
719 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; | |
720 | rec_seq = | |
721 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; | |
722 | break; | |
723 | default: | |
724 | rc = -EINVAL; | |
725 | goto free_offload_ctx; | |
726 | } | |
727 | ||
4509de14 VG |
728 | prot->prepend_size = TLS_HEADER_SIZE + nonce_size; |
729 | prot->tag_size = tag_size; | |
730 | prot->overhead_size = prot->prepend_size + prot->tag_size; | |
731 | prot->iv_size = iv_size; | |
e8f69799 IL |
732 | ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
733 | GFP_KERNEL); | |
734 | if (!ctx->tx.iv) { | |
735 | rc = -ENOMEM; | |
736 | goto free_offload_ctx; | |
737 | } | |
738 | ||
739 | memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size); | |
740 | ||
4509de14 | 741 | prot->rec_seq_size = rec_seq_size; |
969d5090 | 742 | ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); |
e8f69799 IL |
743 | if (!ctx->tx.rec_seq) { |
744 | rc = -ENOMEM; | |
745 | goto free_iv; | |
746 | } | |
e8f69799 IL |
747 | |
748 | rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info); | |
749 | if (rc) | |
750 | goto free_rec_seq; | |
751 | ||
752 | /* start at rec_seq - 1 to account for the start marker record */ | |
753 | memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn)); | |
754 | offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1; | |
755 | ||
756 | start_marker_record->end_seq = tcp_sk(sk)->write_seq; | |
757 | start_marker_record->len = 0; | |
758 | start_marker_record->num_frags = 0; | |
759 | ||
760 | INIT_LIST_HEAD(&offload_ctx->records_list); | |
761 | list_add_tail(&start_marker_record->list, &offload_ctx->records_list); | |
762 | spin_lock_init(&offload_ctx->lock); | |
895262d8 BP |
763 | sg_init_table(offload_ctx->sg_tx_data, |
764 | ARRAY_SIZE(offload_ctx->sg_tx_data)); | |
e8f69799 IL |
765 | |
766 | clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked); | |
767 | ctx->push_pending_record = tls_device_push_pending_record; | |
e8f69799 IL |
768 | |
769 | /* TLS offload is greatly simplified if we don't send | |
770 | * SKBs where only part of the payload needs to be encrypted. | |
771 | * So mark the last skb in the write queue as end of record. | |
772 | */ | |
773 | skb = tcp_write_queue_tail(sk); | |
774 | if (skb) | |
775 | TCP_SKB_CB(skb)->eor = 1; | |
776 | ||
e8f69799 IL |
777 | /* We support starting offload on multiple sockets |
778 | * concurrently, so we only need a read lock here. | |
779 | * This lock must precede get_netdev_for_sock to prevent races between | |
780 | * NETDEV_DOWN and setsockopt. | |
781 | */ | |
782 | down_read(&device_offload_lock); | |
783 | netdev = get_netdev_for_sock(sk); | |
784 | if (!netdev) { | |
785 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
786 | rc = -EINVAL; | |
787 | goto release_lock; | |
788 | } | |
789 | ||
790 | if (!(netdev->features & NETIF_F_HW_TLS_TX)) { | |
791 | rc = -ENOTSUPP; | |
792 | goto release_netdev; | |
793 | } | |
794 | ||
795 | /* Avoid offloading if the device is down | |
796 | * We don't want to offload new flows after | |
797 | * the NETDEV_DOWN event | |
798 | */ | |
799 | if (!(netdev->flags & IFF_UP)) { | |
800 | rc = -EINVAL; | |
801 | goto release_netdev; | |
802 | } | |
803 | ||
804 | ctx->priv_ctx_tx = offload_ctx; | |
805 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX, | |
86029d10 | 806 | &ctx->crypto_send.info, |
e8f69799 IL |
807 | tcp_sk(sk)->write_seq); |
808 | if (rc) | |
809 | goto release_netdev; | |
810 | ||
4799ac81 | 811 | tls_device_attach(ctx, sk, netdev); |
e8f69799 | 812 | |
e8f69799 IL |
813 | /* following this assignment tls_is_sk_tx_device_offloaded |
814 | * will return true and the context might be accessed | |
815 | * by the netdev's xmit function. | |
816 | */ | |
4799ac81 BP |
817 | smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb); |
818 | dev_put(netdev); | |
e8f69799 IL |
819 | up_read(&device_offload_lock); |
820 | goto out; | |
821 | ||
822 | release_netdev: | |
823 | dev_put(netdev); | |
824 | release_lock: | |
825 | up_read(&device_offload_lock); | |
826 | clean_acked_data_disable(inet_csk(sk)); | |
827 | crypto_free_aead(offload_ctx->aead_send); | |
828 | free_rec_seq: | |
829 | kfree(ctx->tx.rec_seq); | |
830 | free_iv: | |
831 | kfree(ctx->tx.iv); | |
832 | free_offload_ctx: | |
833 | kfree(offload_ctx); | |
834 | ctx->priv_ctx_tx = NULL; | |
835 | free_marker_record: | |
836 | kfree(start_marker_record); | |
837 | out: | |
838 | return rc; | |
839 | } | |
840 | ||
4799ac81 BP |
841 | int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx) |
842 | { | |
843 | struct tls_offload_context_rx *context; | |
844 | struct net_device *netdev; | |
845 | int rc = 0; | |
846 | ||
847 | /* We support starting offload on multiple sockets | |
848 | * concurrently, so we only need a read lock here. | |
849 | * This lock must precede get_netdev_for_sock to prevent races between | |
850 | * NETDEV_DOWN and setsockopt. | |
851 | */ | |
852 | down_read(&device_offload_lock); | |
853 | netdev = get_netdev_for_sock(sk); | |
854 | if (!netdev) { | |
855 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
856 | rc = -EINVAL; | |
857 | goto release_lock; | |
858 | } | |
859 | ||
860 | if (!(netdev->features & NETIF_F_HW_TLS_RX)) { | |
861 | pr_err_ratelimited("%s: netdev %s with no TLS offload\n", | |
862 | __func__, netdev->name); | |
863 | rc = -ENOTSUPP; | |
864 | goto release_netdev; | |
865 | } | |
866 | ||
867 | /* Avoid offloading if the device is down | |
868 | * We don't want to offload new flows after | |
869 | * the NETDEV_DOWN event | |
870 | */ | |
871 | if (!(netdev->flags & IFF_UP)) { | |
872 | rc = -EINVAL; | |
873 | goto release_netdev; | |
874 | } | |
875 | ||
876 | context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL); | |
877 | if (!context) { | |
878 | rc = -ENOMEM; | |
879 | goto release_netdev; | |
880 | } | |
881 | ||
882 | ctx->priv_ctx_rx = context; | |
883 | rc = tls_set_sw_offload(sk, ctx, 0); | |
884 | if (rc) | |
885 | goto release_ctx; | |
886 | ||
887 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX, | |
86029d10 | 888 | &ctx->crypto_recv.info, |
4799ac81 BP |
889 | tcp_sk(sk)->copied_seq); |
890 | if (rc) { | |
891 | pr_err_ratelimited("%s: The netdev has refused to offload this socket\n", | |
892 | __func__); | |
893 | goto free_sw_resources; | |
894 | } | |
895 | ||
896 | tls_device_attach(ctx, sk, netdev); | |
897 | goto release_netdev; | |
898 | ||
899 | free_sw_resources: | |
900 | tls_sw_free_resources_rx(sk); | |
901 | release_ctx: | |
902 | ctx->priv_ctx_rx = NULL; | |
903 | release_netdev: | |
904 | dev_put(netdev); | |
905 | release_lock: | |
906 | up_read(&device_offload_lock); | |
907 | return rc; | |
908 | } | |
909 | ||
910 | void tls_device_offload_cleanup_rx(struct sock *sk) | |
911 | { | |
912 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
913 | struct net_device *netdev; | |
914 | ||
915 | down_read(&device_offload_lock); | |
916 | netdev = tls_ctx->netdev; | |
917 | if (!netdev) | |
918 | goto out; | |
919 | ||
920 | if (!(netdev->features & NETIF_F_HW_TLS_RX)) { | |
921 | pr_err_ratelimited("%s: device is missing NETIF_F_HW_TLS_RX cap\n", | |
922 | __func__); | |
923 | goto out; | |
924 | } | |
925 | ||
926 | netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx, | |
927 | TLS_OFFLOAD_CTX_DIR_RX); | |
928 | ||
929 | if (tls_ctx->tx_conf != TLS_HW) { | |
930 | dev_put(netdev); | |
931 | tls_ctx->netdev = NULL; | |
932 | } | |
933 | out: | |
934 | up_read(&device_offload_lock); | |
935 | kfree(tls_ctx->rx.rec_seq); | |
936 | kfree(tls_ctx->rx.iv); | |
937 | tls_sw_release_resources_rx(sk); | |
938 | } | |
939 | ||
e8f69799 IL |
940 | static int tls_device_down(struct net_device *netdev) |
941 | { | |
942 | struct tls_context *ctx, *tmp; | |
943 | unsigned long flags; | |
944 | LIST_HEAD(list); | |
945 | ||
946 | /* Request a write lock to block new offload attempts */ | |
947 | down_write(&device_offload_lock); | |
948 | ||
949 | spin_lock_irqsave(&tls_device_lock, flags); | |
950 | list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) { | |
951 | if (ctx->netdev != netdev || | |
952 | !refcount_inc_not_zero(&ctx->refcount)) | |
953 | continue; | |
954 | ||
955 | list_move(&ctx->list, &list); | |
956 | } | |
957 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
958 | ||
959 | list_for_each_entry_safe(ctx, tmp, &list, list) { | |
4799ac81 BP |
960 | if (ctx->tx_conf == TLS_HW) |
961 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
962 | TLS_OFFLOAD_CTX_DIR_TX); | |
963 | if (ctx->rx_conf == TLS_HW) | |
964 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
965 | TLS_OFFLOAD_CTX_DIR_RX); | |
e8f69799 IL |
966 | ctx->netdev = NULL; |
967 | dev_put(netdev); | |
968 | list_del_init(&ctx->list); | |
969 | ||
970 | if (refcount_dec_and_test(&ctx->refcount)) | |
971 | tls_device_free_ctx(ctx); | |
972 | } | |
973 | ||
974 | up_write(&device_offload_lock); | |
975 | ||
976 | flush_work(&tls_device_gc_work); | |
977 | ||
978 | return NOTIFY_DONE; | |
979 | } | |
980 | ||
981 | static int tls_dev_event(struct notifier_block *this, unsigned long event, | |
982 | void *ptr) | |
983 | { | |
984 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
985 | ||
4799ac81 | 986 | if (!(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX))) |
e8f69799 IL |
987 | return NOTIFY_DONE; |
988 | ||
989 | switch (event) { | |
990 | case NETDEV_REGISTER: | |
991 | case NETDEV_FEAT_CHANGE: | |
4799ac81 BP |
992 | if ((dev->features & NETIF_F_HW_TLS_RX) && |
993 | !dev->tlsdev_ops->tls_dev_resync_rx) | |
994 | return NOTIFY_BAD; | |
995 | ||
e8f69799 IL |
996 | if (dev->tlsdev_ops && |
997 | dev->tlsdev_ops->tls_dev_add && | |
998 | dev->tlsdev_ops->tls_dev_del) | |
999 | return NOTIFY_DONE; | |
1000 | else | |
1001 | return NOTIFY_BAD; | |
1002 | case NETDEV_DOWN: | |
1003 | return tls_device_down(dev); | |
1004 | } | |
1005 | return NOTIFY_DONE; | |
1006 | } | |
1007 | ||
1008 | static struct notifier_block tls_dev_notifier = { | |
1009 | .notifier_call = tls_dev_event, | |
1010 | }; | |
1011 | ||
1012 | void __init tls_device_init(void) | |
1013 | { | |
1014 | register_netdevice_notifier(&tls_dev_notifier); | |
1015 | } | |
1016 | ||
1017 | void __exit tls_device_cleanup(void) | |
1018 | { | |
1019 | unregister_netdevice_notifier(&tls_dev_notifier); | |
1020 | flush_work(&tls_device_gc_work); | |
1021 | } |