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1 | /* Copyright (c) 2018, Mellanox Technologies All rights reserved. | |
2 | * | |
3 | * This software is available to you under a choice of one of two | |
4 | * licenses. You may choose to be licensed under the terms of the GNU | |
5 | * General Public License (GPL) Version 2, available from the file | |
6 | * COPYING in the main directory of this source tree, or the | |
7 | * OpenIB.org BSD license below: | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or | |
10 | * without modification, are permitted provided that the following | |
11 | * conditions are met: | |
12 | * | |
13 | * - Redistributions of source code must retain the above | |
14 | * copyright notice, this list of conditions and the following | |
15 | * disclaimer. | |
16 | * | |
17 | * - Redistributions in binary form must reproduce the above | |
18 | * copyright notice, this list of conditions and the following | |
19 | * disclaimer in the documentation and/or other materials | |
20 | * provided with the distribution. | |
21 | * | |
22 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
23 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
24 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
25 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
26 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
27 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
28 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
29 | * SOFTWARE. | |
30 | */ | |
31 | ||
32 | #include <crypto/aead.h> | |
33 | #include <linux/highmem.h> | |
34 | #include <linux/module.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <net/dst.h> | |
37 | #include <net/inet_connection_sock.h> | |
38 | #include <net/tcp.h> | |
39 | #include <net/tls.h> | |
40 | ||
41 | /* device_offload_lock is used to synchronize tls_dev_add | |
42 | * against NETDEV_DOWN notifications. | |
43 | */ | |
44 | static DECLARE_RWSEM(device_offload_lock); | |
45 | ||
46 | static void tls_device_gc_task(struct work_struct *work); | |
47 | ||
48 | static DECLARE_WORK(tls_device_gc_work, tls_device_gc_task); | |
49 | static LIST_HEAD(tls_device_gc_list); | |
50 | static LIST_HEAD(tls_device_list); | |
51 | static DEFINE_SPINLOCK(tls_device_lock); | |
52 | ||
53 | static void tls_device_free_ctx(struct tls_context *ctx) | |
54 | { | |
55 | if (ctx->tx_conf == TLS_HW) { | |
56 | kfree(tls_offload_ctx_tx(ctx)); | |
57 | kfree(ctx->tx.rec_seq); | |
58 | kfree(ctx->tx.iv); | |
59 | } | |
60 | ||
61 | if (ctx->rx_conf == TLS_HW) | |
62 | kfree(tls_offload_ctx_rx(ctx)); | |
63 | ||
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 | ||
80 | if (netdev && ctx->tx_conf == TLS_HW) { | |
81 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
82 | TLS_OFFLOAD_CTX_DIR_TX); | |
83 | dev_put(netdev); | |
84 | ctx->netdev = NULL; | |
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 | ||
135 | static void delete_all_records(struct tls_offload_context_tx *offload_ctx) | |
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; | |
151 | struct tls_offload_context_tx *ctx; | |
152 | u64 deleted_records = 0; | |
153 | unsigned long flags; | |
154 | ||
155 | if (!tls_ctx) | |
156 | return; | |
157 | ||
158 | ctx = tls_offload_ctx_tx(tls_ctx); | |
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 | */ | |
186 | static void tls_device_sk_destruct(struct sock *sk) | |
187 | { | |
188 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
189 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); | |
190 | ||
191 | tls_ctx->sk_destruct(sk); | |
192 | ||
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 | } | |
200 | ||
201 | if (refcount_dec_and_test(&tls_ctx->refcount)) | |
202 | tls_device_queue_ctx_destruction(tls_ctx); | |
203 | } | |
204 | ||
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 | ||
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, | |
237 | struct tls_offload_context_tx *offload_ctx, | |
238 | struct tls_record_info *record, | |
239 | struct page_frag *pfrag, | |
240 | int flags, | |
241 | unsigned char record_type) | |
242 | { | |
243 | struct tls_prot_info *prot = &ctx->prot_info; | |
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), | |
253 | record->len - prot->prepend_size, | |
254 | record_type, | |
255 | ctx->crypto_send.info.version); | |
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 | ||
261 | tls_append_frag(record, &dummy_tag_frag, prot->tag_size); | |
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; | |
267 | tls_advance_record_sn(sk, &ctx->tx, ctx->crypto_send.info.version); | |
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 | ||
283 | static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx, | |
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, | |
309 | struct tls_offload_context_tx *offload_ctx, | |
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); | |
343 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
344 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); | |
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); | |
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 | } | |
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 + | |
375 | prot->prepend_size; | |
376 | do { | |
377 | rc = tls_do_allocation(sk, ctx, pfrag, | |
378 | prot->prepend_size); | |
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; | |
396 | } else if (record->len > prot->prepend_size) { | |
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 = | |
421 | !!record->num_frags; | |
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; | |
489 | iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size); | |
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 | ||
499 | struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context, | |
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 | ||
538 | iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0); | |
539 | return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA); | |
540 | } | |
541 | ||
542 | void tls_device_write_space(struct sock *sk, struct tls_context *ctx) | |
543 | { | |
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; | |
548 | tls_push_partial_record(sk, ctx, MSG_DONTWAIT | MSG_NOSIGNAL); | |
549 | sk->sk_allocation = sk_allocation; | |
550 | } | |
551 | } | |
552 | ||
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 tls_offload_context_rx *rx_ctx; | |
557 | struct net_device *netdev; | |
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); | |
567 | req_seq = (resync_req >> 32) - ((u32)TLS_HEADER_SIZE - 1); | |
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 | seq += TLS_HEADER_SIZE - 1; | |
573 | down_read(&device_offload_lock); | |
574 | netdev = tls_ctx->netdev; | |
575 | if (netdev) | |
576 | netdev->tlsdev_ops->tls_dev_resync_rx(netdev, sk, seq, | |
577 | rcd_sn); | |
578 | up_read(&device_offload_lock); | |
579 | } | |
580 | } | |
581 | ||
582 | static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb) | |
583 | { | |
584 | struct strp_msg *rxm = strp_msg(skb); | |
585 | int err = 0, offset = rxm->offset, copy, nsg, data_len, pos; | |
586 | struct sk_buff *skb_iter, *unused; | |
587 | struct scatterlist sg[1]; | |
588 | char *orig_buf, *buf; | |
589 | ||
590 | orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE + | |
591 | TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation); | |
592 | if (!orig_buf) | |
593 | return -ENOMEM; | |
594 | buf = orig_buf; | |
595 | ||
596 | nsg = skb_cow_data(skb, 0, &unused); | |
597 | if (unlikely(nsg < 0)) { | |
598 | err = nsg; | |
599 | goto free_buf; | |
600 | } | |
601 | ||
602 | sg_init_table(sg, 1); | |
603 | sg_set_buf(&sg[0], buf, | |
604 | rxm->full_len + TLS_HEADER_SIZE + | |
605 | TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
606 | skb_copy_bits(skb, offset, buf, | |
607 | TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
608 | ||
609 | /* We are interested only in the decrypted data not the auth */ | |
610 | err = decrypt_skb(sk, skb, sg); | |
611 | if (err != -EBADMSG) | |
612 | goto free_buf; | |
613 | else | |
614 | err = 0; | |
615 | ||
616 | data_len = rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
617 | ||
618 | if (skb_pagelen(skb) > offset) { | |
619 | copy = min_t(int, skb_pagelen(skb) - offset, data_len); | |
620 | ||
621 | if (skb->decrypted) | |
622 | skb_store_bits(skb, offset, buf, copy); | |
623 | ||
624 | offset += copy; | |
625 | buf += copy; | |
626 | } | |
627 | ||
628 | pos = skb_pagelen(skb); | |
629 | skb_walk_frags(skb, skb_iter) { | |
630 | int frag_pos; | |
631 | ||
632 | /* Practically all frags must belong to msg if reencrypt | |
633 | * is needed with current strparser and coalescing logic, | |
634 | * but strparser may "get optimized", so let's be safe. | |
635 | */ | |
636 | if (pos + skb_iter->len <= offset) | |
637 | goto done_with_frag; | |
638 | if (pos >= data_len + rxm->offset) | |
639 | break; | |
640 | ||
641 | frag_pos = offset - pos; | |
642 | copy = min_t(int, skb_iter->len - frag_pos, | |
643 | data_len + rxm->offset - offset); | |
644 | ||
645 | if (skb_iter->decrypted) | |
646 | skb_store_bits(skb_iter, frag_pos, buf, copy); | |
647 | ||
648 | offset += copy; | |
649 | buf += copy; | |
650 | done_with_frag: | |
651 | pos += skb_iter->len; | |
652 | } | |
653 | ||
654 | free_buf: | |
655 | kfree(orig_buf); | |
656 | return err; | |
657 | } | |
658 | ||
659 | int tls_device_decrypted(struct sock *sk, struct sk_buff *skb) | |
660 | { | |
661 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
662 | struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx); | |
663 | int is_decrypted = skb->decrypted; | |
664 | int is_encrypted = !is_decrypted; | |
665 | struct sk_buff *skb_iter; | |
666 | ||
667 | /* Skip if it is already decrypted */ | |
668 | if (ctx->sw.decrypted) | |
669 | return 0; | |
670 | ||
671 | /* Check if all the data is decrypted already */ | |
672 | skb_walk_frags(skb, skb_iter) { | |
673 | is_decrypted &= skb_iter->decrypted; | |
674 | is_encrypted &= !skb_iter->decrypted; | |
675 | } | |
676 | ||
677 | ctx->sw.decrypted |= is_decrypted; | |
678 | ||
679 | /* Return immedeatly if the record is either entirely plaintext or | |
680 | * entirely ciphertext. Otherwise handle reencrypt partially decrypted | |
681 | * record. | |
682 | */ | |
683 | return (is_encrypted || is_decrypted) ? 0 : | |
684 | tls_device_reencrypt(sk, skb); | |
685 | } | |
686 | ||
687 | static void tls_device_attach(struct tls_context *ctx, struct sock *sk, | |
688 | struct net_device *netdev) | |
689 | { | |
690 | if (sk->sk_destruct != tls_device_sk_destruct) { | |
691 | refcount_set(&ctx->refcount, 1); | |
692 | dev_hold(netdev); | |
693 | ctx->netdev = netdev; | |
694 | spin_lock_irq(&tls_device_lock); | |
695 | list_add_tail(&ctx->list, &tls_device_list); | |
696 | spin_unlock_irq(&tls_device_lock); | |
697 | ||
698 | ctx->sk_destruct = sk->sk_destruct; | |
699 | sk->sk_destruct = tls_device_sk_destruct; | |
700 | } | |
701 | } | |
702 | ||
703 | int tls_set_device_offload(struct sock *sk, struct tls_context *ctx) | |
704 | { | |
705 | u16 nonce_size, tag_size, iv_size, rec_seq_size; | |
706 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
707 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
708 | struct tls_record_info *start_marker_record; | |
709 | struct tls_offload_context_tx *offload_ctx; | |
710 | struct tls_crypto_info *crypto_info; | |
711 | struct net_device *netdev; | |
712 | char *iv, *rec_seq; | |
713 | struct sk_buff *skb; | |
714 | int rc = -EINVAL; | |
715 | __be64 rcd_sn; | |
716 | ||
717 | if (!ctx) | |
718 | goto out; | |
719 | ||
720 | if (ctx->priv_ctx_tx) { | |
721 | rc = -EEXIST; | |
722 | goto out; | |
723 | } | |
724 | ||
725 | start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL); | |
726 | if (!start_marker_record) { | |
727 | rc = -ENOMEM; | |
728 | goto out; | |
729 | } | |
730 | ||
731 | offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL); | |
732 | if (!offload_ctx) { | |
733 | rc = -ENOMEM; | |
734 | goto free_marker_record; | |
735 | } | |
736 | ||
737 | crypto_info = &ctx->crypto_send.info; | |
738 | switch (crypto_info->cipher_type) { | |
739 | case TLS_CIPHER_AES_GCM_128: | |
740 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
741 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
742 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
743 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; | |
744 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; | |
745 | rec_seq = | |
746 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; | |
747 | break; | |
748 | default: | |
749 | rc = -EINVAL; | |
750 | goto free_offload_ctx; | |
751 | } | |
752 | ||
753 | prot->prepend_size = TLS_HEADER_SIZE + nonce_size; | |
754 | prot->tag_size = tag_size; | |
755 | prot->overhead_size = prot->prepend_size + prot->tag_size; | |
756 | prot->iv_size = iv_size; | |
757 | ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE, | |
758 | GFP_KERNEL); | |
759 | if (!ctx->tx.iv) { | |
760 | rc = -ENOMEM; | |
761 | goto free_offload_ctx; | |
762 | } | |
763 | ||
764 | memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size); | |
765 | ||
766 | prot->rec_seq_size = rec_seq_size; | |
767 | ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); | |
768 | if (!ctx->tx.rec_seq) { | |
769 | rc = -ENOMEM; | |
770 | goto free_iv; | |
771 | } | |
772 | ||
773 | rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info); | |
774 | if (rc) | |
775 | goto free_rec_seq; | |
776 | ||
777 | /* start at rec_seq - 1 to account for the start marker record */ | |
778 | memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn)); | |
779 | offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1; | |
780 | ||
781 | start_marker_record->end_seq = tcp_sk(sk)->write_seq; | |
782 | start_marker_record->len = 0; | |
783 | start_marker_record->num_frags = 0; | |
784 | ||
785 | INIT_LIST_HEAD(&offload_ctx->records_list); | |
786 | list_add_tail(&start_marker_record->list, &offload_ctx->records_list); | |
787 | spin_lock_init(&offload_ctx->lock); | |
788 | sg_init_table(offload_ctx->sg_tx_data, | |
789 | ARRAY_SIZE(offload_ctx->sg_tx_data)); | |
790 | ||
791 | clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked); | |
792 | ctx->push_pending_record = tls_device_push_pending_record; | |
793 | ||
794 | /* TLS offload is greatly simplified if we don't send | |
795 | * SKBs where only part of the payload needs to be encrypted. | |
796 | * So mark the last skb in the write queue as end of record. | |
797 | */ | |
798 | skb = tcp_write_queue_tail(sk); | |
799 | if (skb) | |
800 | TCP_SKB_CB(skb)->eor = 1; | |
801 | ||
802 | /* We support starting offload on multiple sockets | |
803 | * concurrently, so we only need a read lock here. | |
804 | * This lock must precede get_netdev_for_sock to prevent races between | |
805 | * NETDEV_DOWN and setsockopt. | |
806 | */ | |
807 | down_read(&device_offload_lock); | |
808 | netdev = get_netdev_for_sock(sk); | |
809 | if (!netdev) { | |
810 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
811 | rc = -EINVAL; | |
812 | goto release_lock; | |
813 | } | |
814 | ||
815 | if (!(netdev->features & NETIF_F_HW_TLS_TX)) { | |
816 | rc = -ENOTSUPP; | |
817 | goto release_netdev; | |
818 | } | |
819 | ||
820 | /* Avoid offloading if the device is down | |
821 | * We don't want to offload new flows after | |
822 | * the NETDEV_DOWN event | |
823 | */ | |
824 | if (!(netdev->flags & IFF_UP)) { | |
825 | rc = -EINVAL; | |
826 | goto release_netdev; | |
827 | } | |
828 | ||
829 | ctx->priv_ctx_tx = offload_ctx; | |
830 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX, | |
831 | &ctx->crypto_send.info, | |
832 | tcp_sk(sk)->write_seq); | |
833 | if (rc) | |
834 | goto release_netdev; | |
835 | ||
836 | tls_device_attach(ctx, sk, netdev); | |
837 | ||
838 | /* following this assignment tls_is_sk_tx_device_offloaded | |
839 | * will return true and the context might be accessed | |
840 | * by the netdev's xmit function. | |
841 | */ | |
842 | smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb); | |
843 | dev_put(netdev); | |
844 | up_read(&device_offload_lock); | |
845 | goto out; | |
846 | ||
847 | release_netdev: | |
848 | dev_put(netdev); | |
849 | release_lock: | |
850 | up_read(&device_offload_lock); | |
851 | clean_acked_data_disable(inet_csk(sk)); | |
852 | crypto_free_aead(offload_ctx->aead_send); | |
853 | free_rec_seq: | |
854 | kfree(ctx->tx.rec_seq); | |
855 | free_iv: | |
856 | kfree(ctx->tx.iv); | |
857 | free_offload_ctx: | |
858 | kfree(offload_ctx); | |
859 | ctx->priv_ctx_tx = NULL; | |
860 | free_marker_record: | |
861 | kfree(start_marker_record); | |
862 | out: | |
863 | return rc; | |
864 | } | |
865 | ||
866 | int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx) | |
867 | { | |
868 | struct tls_offload_context_rx *context; | |
869 | struct net_device *netdev; | |
870 | int rc = 0; | |
871 | ||
872 | /* We support starting offload on multiple sockets | |
873 | * concurrently, so we only need a read lock here. | |
874 | * This lock must precede get_netdev_for_sock to prevent races between | |
875 | * NETDEV_DOWN and setsockopt. | |
876 | */ | |
877 | down_read(&device_offload_lock); | |
878 | netdev = get_netdev_for_sock(sk); | |
879 | if (!netdev) { | |
880 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
881 | rc = -EINVAL; | |
882 | goto release_lock; | |
883 | } | |
884 | ||
885 | if (!(netdev->features & NETIF_F_HW_TLS_RX)) { | |
886 | rc = -ENOTSUPP; | |
887 | goto release_netdev; | |
888 | } | |
889 | ||
890 | /* Avoid offloading if the device is down | |
891 | * We don't want to offload new flows after | |
892 | * the NETDEV_DOWN event | |
893 | */ | |
894 | if (!(netdev->flags & IFF_UP)) { | |
895 | rc = -EINVAL; | |
896 | goto release_netdev; | |
897 | } | |
898 | ||
899 | context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL); | |
900 | if (!context) { | |
901 | rc = -ENOMEM; | |
902 | goto release_netdev; | |
903 | } | |
904 | ||
905 | ctx->priv_ctx_rx = context; | |
906 | rc = tls_set_sw_offload(sk, ctx, 0); | |
907 | if (rc) | |
908 | goto release_ctx; | |
909 | ||
910 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX, | |
911 | &ctx->crypto_recv.info, | |
912 | tcp_sk(sk)->copied_seq); | |
913 | if (rc) | |
914 | goto free_sw_resources; | |
915 | ||
916 | tls_device_attach(ctx, sk, netdev); | |
917 | goto release_netdev; | |
918 | ||
919 | free_sw_resources: | |
920 | up_read(&device_offload_lock); | |
921 | tls_sw_free_resources_rx(sk); | |
922 | down_read(&device_offload_lock); | |
923 | release_ctx: | |
924 | ctx->priv_ctx_rx = NULL; | |
925 | release_netdev: | |
926 | dev_put(netdev); | |
927 | release_lock: | |
928 | up_read(&device_offload_lock); | |
929 | return rc; | |
930 | } | |
931 | ||
932 | void tls_device_offload_cleanup_rx(struct sock *sk) | |
933 | { | |
934 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
935 | struct net_device *netdev; | |
936 | ||
937 | down_read(&device_offload_lock); | |
938 | netdev = tls_ctx->netdev; | |
939 | if (!netdev) | |
940 | goto out; | |
941 | ||
942 | netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx, | |
943 | TLS_OFFLOAD_CTX_DIR_RX); | |
944 | ||
945 | if (tls_ctx->tx_conf != TLS_HW) { | |
946 | dev_put(netdev); | |
947 | tls_ctx->netdev = NULL; | |
948 | } | |
949 | out: | |
950 | up_read(&device_offload_lock); | |
951 | tls_sw_release_resources_rx(sk); | |
952 | } | |
953 | ||
954 | static int tls_device_down(struct net_device *netdev) | |
955 | { | |
956 | struct tls_context *ctx, *tmp; | |
957 | unsigned long flags; | |
958 | LIST_HEAD(list); | |
959 | ||
960 | /* Request a write lock to block new offload attempts */ | |
961 | down_write(&device_offload_lock); | |
962 | ||
963 | spin_lock_irqsave(&tls_device_lock, flags); | |
964 | list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) { | |
965 | if (ctx->netdev != netdev || | |
966 | !refcount_inc_not_zero(&ctx->refcount)) | |
967 | continue; | |
968 | ||
969 | list_move(&ctx->list, &list); | |
970 | } | |
971 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
972 | ||
973 | list_for_each_entry_safe(ctx, tmp, &list, list) { | |
974 | if (ctx->tx_conf == TLS_HW) | |
975 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
976 | TLS_OFFLOAD_CTX_DIR_TX); | |
977 | if (ctx->rx_conf == TLS_HW) | |
978 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
979 | TLS_OFFLOAD_CTX_DIR_RX); | |
980 | ctx->netdev = NULL; | |
981 | dev_put(netdev); | |
982 | list_del_init(&ctx->list); | |
983 | ||
984 | if (refcount_dec_and_test(&ctx->refcount)) | |
985 | tls_device_free_ctx(ctx); | |
986 | } | |
987 | ||
988 | up_write(&device_offload_lock); | |
989 | ||
990 | flush_work(&tls_device_gc_work); | |
991 | ||
992 | return NOTIFY_DONE; | |
993 | } | |
994 | ||
995 | static int tls_dev_event(struct notifier_block *this, unsigned long event, | |
996 | void *ptr) | |
997 | { | |
998 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
999 | ||
1000 | if (!dev->tlsdev_ops && | |
1001 | !(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX))) | |
1002 | return NOTIFY_DONE; | |
1003 | ||
1004 | switch (event) { | |
1005 | case NETDEV_REGISTER: | |
1006 | case NETDEV_FEAT_CHANGE: | |
1007 | if ((dev->features & NETIF_F_HW_TLS_RX) && | |
1008 | !dev->tlsdev_ops->tls_dev_resync_rx) | |
1009 | return NOTIFY_BAD; | |
1010 | ||
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); | |
1036 | clean_acked_data_flush(); | |
1037 | } |