Commit | Line | Data |
---|---|---|
3c4d7559 DW |
1 | /* |
2 | * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved. | |
3 | * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved. | |
4 | * Copyright (c) 2016-2017, Lance Chao <lancerchao@fb.com>. All rights reserved. | |
5 | * Copyright (c) 2016, Fridolin Pokorny <fridolin.pokorny@gmail.com>. All rights reserved. | |
6 | * Copyright (c) 2016, Nikos Mavrogiannopoulos <nmav@gnutls.org>. All rights reserved. | |
7 | * | |
8 | * This software is available to you under a choice of one of two | |
9 | * licenses. You may choose to be licensed under the terms of the GNU | |
10 | * General Public License (GPL) Version 2, available from the file | |
11 | * COPYING in the main directory of this source tree, or the | |
12 | * OpenIB.org BSD license below: | |
13 | * | |
14 | * Redistribution and use in source and binary forms, with or | |
15 | * without modification, are permitted provided that the following | |
16 | * conditions are met: | |
17 | * | |
18 | * - Redistributions of source code must retain the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer. | |
21 | * | |
22 | * - Redistributions in binary form must reproduce the above | |
23 | * copyright notice, this list of conditions and the following | |
24 | * disclaimer in the documentation and/or other materials | |
25 | * provided with the distribution. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
28 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
29 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
30 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
31 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
32 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
33 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
34 | * SOFTWARE. | |
35 | */ | |
36 | ||
c46234eb | 37 | #include <linux/sched/signal.h> |
3c4d7559 DW |
38 | #include <linux/module.h> |
39 | #include <crypto/aead.h> | |
40 | ||
c46234eb | 41 | #include <net/strparser.h> |
3c4d7559 DW |
42 | #include <net/tls.h> |
43 | ||
b16520f7 KC |
44 | #define MAX_IV_SIZE TLS_CIPHER_AES_GCM_128_IV_SIZE |
45 | ||
c46234eb DW |
46 | static int tls_do_decryption(struct sock *sk, |
47 | struct scatterlist *sgin, | |
48 | struct scatterlist *sgout, | |
49 | char *iv_recv, | |
50 | size_t data_len, | |
51 | struct sk_buff *skb, | |
52 | gfp_t flags) | |
53 | { | |
54 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
55 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
56 | struct strp_msg *rxm = strp_msg(skb); | |
57 | struct aead_request *aead_req; | |
58 | ||
59 | int ret; | |
60 | unsigned int req_size = sizeof(struct aead_request) + | |
61 | crypto_aead_reqsize(ctx->aead_recv); | |
62 | ||
63 | aead_req = kzalloc(req_size, flags); | |
64 | if (!aead_req) | |
65 | return -ENOMEM; | |
66 | ||
67 | aead_request_set_tfm(aead_req, ctx->aead_recv); | |
68 | aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE); | |
69 | aead_request_set_crypt(aead_req, sgin, sgout, | |
70 | data_len + tls_ctx->rx.tag_size, | |
71 | (u8 *)iv_recv); | |
72 | aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG, | |
73 | crypto_req_done, &ctx->async_wait); | |
74 | ||
75 | ret = crypto_wait_req(crypto_aead_decrypt(aead_req), &ctx->async_wait); | |
76 | ||
77 | if (ret < 0) | |
78 | goto out; | |
79 | ||
80 | rxm->offset += tls_ctx->rx.prepend_size; | |
81 | rxm->full_len -= tls_ctx->rx.overhead_size; | |
82 | tls_advance_record_sn(sk, &tls_ctx->rx); | |
83 | ||
84 | ctx->decrypted = true; | |
85 | ||
86 | ctx->saved_data_ready(sk); | |
87 | ||
88 | out: | |
89 | kfree(aead_req); | |
90 | return ret; | |
91 | } | |
92 | ||
3c4d7559 DW |
93 | static void trim_sg(struct sock *sk, struct scatterlist *sg, |
94 | int *sg_num_elem, unsigned int *sg_size, int target_size) | |
95 | { | |
96 | int i = *sg_num_elem - 1; | |
97 | int trim = *sg_size - target_size; | |
98 | ||
99 | if (trim <= 0) { | |
100 | WARN_ON(trim < 0); | |
101 | return; | |
102 | } | |
103 | ||
104 | *sg_size = target_size; | |
105 | while (trim >= sg[i].length) { | |
106 | trim -= sg[i].length; | |
107 | sk_mem_uncharge(sk, sg[i].length); | |
108 | put_page(sg_page(&sg[i])); | |
109 | i--; | |
110 | ||
111 | if (i < 0) | |
112 | goto out; | |
113 | } | |
114 | ||
115 | sg[i].length -= trim; | |
116 | sk_mem_uncharge(sk, trim); | |
117 | ||
118 | out: | |
119 | *sg_num_elem = i + 1; | |
120 | } | |
121 | ||
122 | static void trim_both_sgl(struct sock *sk, int target_size) | |
123 | { | |
124 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
125 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
126 | ||
127 | trim_sg(sk, ctx->sg_plaintext_data, | |
128 | &ctx->sg_plaintext_num_elem, | |
129 | &ctx->sg_plaintext_size, | |
130 | target_size); | |
131 | ||
132 | if (target_size > 0) | |
dbe42559 | 133 | target_size += tls_ctx->tx.overhead_size; |
3c4d7559 DW |
134 | |
135 | trim_sg(sk, ctx->sg_encrypted_data, | |
136 | &ctx->sg_encrypted_num_elem, | |
137 | &ctx->sg_encrypted_size, | |
138 | target_size); | |
139 | } | |
140 | ||
3c4d7559 DW |
141 | static int alloc_encrypted_sg(struct sock *sk, int len) |
142 | { | |
143 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
144 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
145 | int rc = 0; | |
146 | ||
2c3682f0 | 147 | rc = sk_alloc_sg(sk, len, |
8c05dbf0 | 148 | ctx->sg_encrypted_data, 0, |
2c3682f0 JF |
149 | &ctx->sg_encrypted_num_elem, |
150 | &ctx->sg_encrypted_size, 0); | |
3c4d7559 DW |
151 | |
152 | return rc; | |
153 | } | |
154 | ||
155 | static int alloc_plaintext_sg(struct sock *sk, int len) | |
156 | { | |
157 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
158 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
159 | int rc = 0; | |
160 | ||
8c05dbf0 | 161 | rc = sk_alloc_sg(sk, len, ctx->sg_plaintext_data, 0, |
2c3682f0 JF |
162 | &ctx->sg_plaintext_num_elem, &ctx->sg_plaintext_size, |
163 | tls_ctx->pending_open_record_frags); | |
3c4d7559 DW |
164 | |
165 | return rc; | |
166 | } | |
167 | ||
168 | static void free_sg(struct sock *sk, struct scatterlist *sg, | |
169 | int *sg_num_elem, unsigned int *sg_size) | |
170 | { | |
171 | int i, n = *sg_num_elem; | |
172 | ||
173 | for (i = 0; i < n; ++i) { | |
174 | sk_mem_uncharge(sk, sg[i].length); | |
175 | put_page(sg_page(&sg[i])); | |
176 | } | |
177 | *sg_num_elem = 0; | |
178 | *sg_size = 0; | |
179 | } | |
180 | ||
181 | static void tls_free_both_sg(struct sock *sk) | |
182 | { | |
183 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
184 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
185 | ||
186 | free_sg(sk, ctx->sg_encrypted_data, &ctx->sg_encrypted_num_elem, | |
187 | &ctx->sg_encrypted_size); | |
188 | ||
189 | free_sg(sk, ctx->sg_plaintext_data, &ctx->sg_plaintext_num_elem, | |
190 | &ctx->sg_plaintext_size); | |
191 | } | |
192 | ||
193 | static int tls_do_encryption(struct tls_context *tls_ctx, | |
194 | struct tls_sw_context *ctx, size_t data_len, | |
195 | gfp_t flags) | |
196 | { | |
197 | unsigned int req_size = sizeof(struct aead_request) + | |
198 | crypto_aead_reqsize(ctx->aead_send); | |
199 | struct aead_request *aead_req; | |
200 | int rc; | |
201 | ||
61ef6da6 | 202 | aead_req = kzalloc(req_size, flags); |
3c4d7559 DW |
203 | if (!aead_req) |
204 | return -ENOMEM; | |
205 | ||
dbe42559 DW |
206 | ctx->sg_encrypted_data[0].offset += tls_ctx->tx.prepend_size; |
207 | ctx->sg_encrypted_data[0].length -= tls_ctx->tx.prepend_size; | |
3c4d7559 DW |
208 | |
209 | aead_request_set_tfm(aead_req, ctx->aead_send); | |
210 | aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE); | |
211 | aead_request_set_crypt(aead_req, ctx->sg_aead_in, ctx->sg_aead_out, | |
dbe42559 | 212 | data_len, tls_ctx->tx.iv); |
a54667f6 VG |
213 | |
214 | aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG, | |
215 | crypto_req_done, &ctx->async_wait); | |
216 | ||
217 | rc = crypto_wait_req(crypto_aead_encrypt(aead_req), &ctx->async_wait); | |
3c4d7559 | 218 | |
dbe42559 DW |
219 | ctx->sg_encrypted_data[0].offset -= tls_ctx->tx.prepend_size; |
220 | ctx->sg_encrypted_data[0].length += tls_ctx->tx.prepend_size; | |
3c4d7559 DW |
221 | |
222 | kfree(aead_req); | |
223 | return rc; | |
224 | } | |
225 | ||
226 | static int tls_push_record(struct sock *sk, int flags, | |
227 | unsigned char record_type) | |
228 | { | |
229 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
230 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
231 | int rc; | |
232 | ||
233 | sg_mark_end(ctx->sg_plaintext_data + ctx->sg_plaintext_num_elem - 1); | |
234 | sg_mark_end(ctx->sg_encrypted_data + ctx->sg_encrypted_num_elem - 1); | |
235 | ||
213ef6e7 | 236 | tls_make_aad(ctx->aad_space, ctx->sg_plaintext_size, |
dbe42559 | 237 | tls_ctx->tx.rec_seq, tls_ctx->tx.rec_seq_size, |
3c4d7559 DW |
238 | record_type); |
239 | ||
240 | tls_fill_prepend(tls_ctx, | |
241 | page_address(sg_page(&ctx->sg_encrypted_data[0])) + | |
242 | ctx->sg_encrypted_data[0].offset, | |
243 | ctx->sg_plaintext_size, record_type); | |
244 | ||
245 | tls_ctx->pending_open_record_frags = 0; | |
246 | set_bit(TLS_PENDING_CLOSED_RECORD, &tls_ctx->flags); | |
247 | ||
248 | rc = tls_do_encryption(tls_ctx, ctx, ctx->sg_plaintext_size, | |
249 | sk->sk_allocation); | |
250 | if (rc < 0) { | |
251 | /* If we are called from write_space and | |
252 | * we fail, we need to set this SOCK_NOSPACE | |
253 | * to trigger another write_space in the future. | |
254 | */ | |
255 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
256 | return rc; | |
257 | } | |
258 | ||
259 | free_sg(sk, ctx->sg_plaintext_data, &ctx->sg_plaintext_num_elem, | |
260 | &ctx->sg_plaintext_size); | |
261 | ||
262 | ctx->sg_encrypted_num_elem = 0; | |
263 | ctx->sg_encrypted_size = 0; | |
264 | ||
265 | /* Only pass through MSG_DONTWAIT and MSG_NOSIGNAL flags */ | |
266 | rc = tls_push_sg(sk, tls_ctx, ctx->sg_encrypted_data, 0, flags); | |
267 | if (rc < 0 && rc != -EAGAIN) | |
f4a8e43f | 268 | tls_err_abort(sk, EBADMSG); |
3c4d7559 | 269 | |
dbe42559 | 270 | tls_advance_record_sn(sk, &tls_ctx->tx); |
3c4d7559 DW |
271 | return rc; |
272 | } | |
273 | ||
274 | static int tls_sw_push_pending_record(struct sock *sk, int flags) | |
275 | { | |
276 | return tls_push_record(sk, flags, TLS_RECORD_TYPE_DATA); | |
277 | } | |
278 | ||
279 | static int zerocopy_from_iter(struct sock *sk, struct iov_iter *from, | |
69ca9293 DW |
280 | int length, int *pages_used, |
281 | unsigned int *size_used, | |
282 | struct scatterlist *to, int to_max_pages, | |
283 | bool charge) | |
3c4d7559 | 284 | { |
3c4d7559 DW |
285 | struct page *pages[MAX_SKB_FRAGS]; |
286 | ||
287 | size_t offset; | |
288 | ssize_t copied, use; | |
289 | int i = 0; | |
69ca9293 DW |
290 | unsigned int size = *size_used; |
291 | int num_elem = *pages_used; | |
3c4d7559 DW |
292 | int rc = 0; |
293 | int maxpages; | |
294 | ||
295 | while (length > 0) { | |
296 | i = 0; | |
69ca9293 | 297 | maxpages = to_max_pages - num_elem; |
3c4d7559 DW |
298 | if (maxpages == 0) { |
299 | rc = -EFAULT; | |
300 | goto out; | |
301 | } | |
302 | copied = iov_iter_get_pages(from, pages, | |
303 | length, | |
304 | maxpages, &offset); | |
305 | if (copied <= 0) { | |
306 | rc = -EFAULT; | |
307 | goto out; | |
308 | } | |
309 | ||
310 | iov_iter_advance(from, copied); | |
311 | ||
312 | length -= copied; | |
313 | size += copied; | |
314 | while (copied) { | |
315 | use = min_t(int, copied, PAGE_SIZE - offset); | |
316 | ||
69ca9293 | 317 | sg_set_page(&to[num_elem], |
3c4d7559 | 318 | pages[i], use, offset); |
69ca9293 DW |
319 | sg_unmark_end(&to[num_elem]); |
320 | if (charge) | |
321 | sk_mem_charge(sk, use); | |
3c4d7559 DW |
322 | |
323 | offset = 0; | |
324 | copied -= use; | |
325 | ||
326 | ++i; | |
327 | ++num_elem; | |
328 | } | |
329 | } | |
330 | ||
331 | out: | |
69ca9293 DW |
332 | *size_used = size; |
333 | *pages_used = num_elem; | |
334 | ||
3c4d7559 DW |
335 | return rc; |
336 | } | |
337 | ||
338 | static int memcopy_from_iter(struct sock *sk, struct iov_iter *from, | |
339 | int bytes) | |
340 | { | |
341 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
342 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
343 | struct scatterlist *sg = ctx->sg_plaintext_data; | |
344 | int copy, i, rc = 0; | |
345 | ||
346 | for (i = tls_ctx->pending_open_record_frags; | |
347 | i < ctx->sg_plaintext_num_elem; ++i) { | |
348 | copy = sg[i].length; | |
349 | if (copy_from_iter( | |
350 | page_address(sg_page(&sg[i])) + sg[i].offset, | |
351 | copy, from) != copy) { | |
352 | rc = -EFAULT; | |
353 | goto out; | |
354 | } | |
355 | bytes -= copy; | |
356 | ||
357 | ++tls_ctx->pending_open_record_frags; | |
358 | ||
359 | if (!bytes) | |
360 | break; | |
361 | } | |
362 | ||
363 | out: | |
364 | return rc; | |
365 | } | |
366 | ||
367 | int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
368 | { | |
369 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
370 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
371 | int ret = 0; | |
372 | int required_size; | |
373 | long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
374 | bool eor = !(msg->msg_flags & MSG_MORE); | |
375 | size_t try_to_copy, copied = 0; | |
376 | unsigned char record_type = TLS_RECORD_TYPE_DATA; | |
377 | int record_room; | |
378 | bool full_record; | |
379 | int orig_size; | |
380 | ||
381 | if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL)) | |
382 | return -ENOTSUPP; | |
383 | ||
384 | lock_sock(sk); | |
385 | ||
386 | if (tls_complete_pending_work(sk, tls_ctx, msg->msg_flags, &timeo)) | |
387 | goto send_end; | |
388 | ||
389 | if (unlikely(msg->msg_controllen)) { | |
390 | ret = tls_proccess_cmsg(sk, msg, &record_type); | |
391 | if (ret) | |
392 | goto send_end; | |
393 | } | |
394 | ||
395 | while (msg_data_left(msg)) { | |
396 | if (sk->sk_err) { | |
30be8f8d | 397 | ret = -sk->sk_err; |
3c4d7559 DW |
398 | goto send_end; |
399 | } | |
400 | ||
401 | orig_size = ctx->sg_plaintext_size; | |
402 | full_record = false; | |
403 | try_to_copy = msg_data_left(msg); | |
404 | record_room = TLS_MAX_PAYLOAD_SIZE - ctx->sg_plaintext_size; | |
405 | if (try_to_copy >= record_room) { | |
406 | try_to_copy = record_room; | |
407 | full_record = true; | |
408 | } | |
409 | ||
410 | required_size = ctx->sg_plaintext_size + try_to_copy + | |
dbe42559 | 411 | tls_ctx->tx.overhead_size; |
3c4d7559 DW |
412 | |
413 | if (!sk_stream_memory_free(sk)) | |
414 | goto wait_for_sndbuf; | |
415 | alloc_encrypted: | |
416 | ret = alloc_encrypted_sg(sk, required_size); | |
417 | if (ret) { | |
418 | if (ret != -ENOSPC) | |
419 | goto wait_for_memory; | |
420 | ||
421 | /* Adjust try_to_copy according to the amount that was | |
422 | * actually allocated. The difference is due | |
423 | * to max sg elements limit | |
424 | */ | |
425 | try_to_copy -= required_size - ctx->sg_encrypted_size; | |
426 | full_record = true; | |
427 | } | |
428 | ||
429 | if (full_record || eor) { | |
430 | ret = zerocopy_from_iter(sk, &msg->msg_iter, | |
69ca9293 DW |
431 | try_to_copy, &ctx->sg_plaintext_num_elem, |
432 | &ctx->sg_plaintext_size, | |
433 | ctx->sg_plaintext_data, | |
434 | ARRAY_SIZE(ctx->sg_plaintext_data), | |
435 | true); | |
3c4d7559 DW |
436 | if (ret) |
437 | goto fallback_to_reg_send; | |
438 | ||
439 | copied += try_to_copy; | |
440 | ret = tls_push_record(sk, msg->msg_flags, record_type); | |
441 | if (!ret) | |
442 | continue; | |
443 | if (ret == -EAGAIN) | |
444 | goto send_end; | |
445 | ||
446 | copied -= try_to_copy; | |
447 | fallback_to_reg_send: | |
448 | iov_iter_revert(&msg->msg_iter, | |
449 | ctx->sg_plaintext_size - orig_size); | |
450 | trim_sg(sk, ctx->sg_plaintext_data, | |
451 | &ctx->sg_plaintext_num_elem, | |
452 | &ctx->sg_plaintext_size, | |
453 | orig_size); | |
454 | } | |
455 | ||
456 | required_size = ctx->sg_plaintext_size + try_to_copy; | |
457 | alloc_plaintext: | |
458 | ret = alloc_plaintext_sg(sk, required_size); | |
459 | if (ret) { | |
460 | if (ret != -ENOSPC) | |
461 | goto wait_for_memory; | |
462 | ||
463 | /* Adjust try_to_copy according to the amount that was | |
464 | * actually allocated. The difference is due | |
465 | * to max sg elements limit | |
466 | */ | |
467 | try_to_copy -= required_size - ctx->sg_plaintext_size; | |
468 | full_record = true; | |
469 | ||
470 | trim_sg(sk, ctx->sg_encrypted_data, | |
471 | &ctx->sg_encrypted_num_elem, | |
472 | &ctx->sg_encrypted_size, | |
473 | ctx->sg_plaintext_size + | |
dbe42559 | 474 | tls_ctx->tx.overhead_size); |
3c4d7559 DW |
475 | } |
476 | ||
477 | ret = memcopy_from_iter(sk, &msg->msg_iter, try_to_copy); | |
478 | if (ret) | |
479 | goto trim_sgl; | |
480 | ||
481 | copied += try_to_copy; | |
482 | if (full_record || eor) { | |
483 | push_record: | |
484 | ret = tls_push_record(sk, msg->msg_flags, record_type); | |
485 | if (ret) { | |
486 | if (ret == -ENOMEM) | |
487 | goto wait_for_memory; | |
488 | ||
489 | goto send_end; | |
490 | } | |
491 | } | |
492 | ||
493 | continue; | |
494 | ||
495 | wait_for_sndbuf: | |
496 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
497 | wait_for_memory: | |
498 | ret = sk_stream_wait_memory(sk, &timeo); | |
499 | if (ret) { | |
500 | trim_sgl: | |
501 | trim_both_sgl(sk, orig_size); | |
502 | goto send_end; | |
503 | } | |
504 | ||
505 | if (tls_is_pending_closed_record(tls_ctx)) | |
506 | goto push_record; | |
507 | ||
508 | if (ctx->sg_encrypted_size < required_size) | |
509 | goto alloc_encrypted; | |
510 | ||
511 | goto alloc_plaintext; | |
512 | } | |
513 | ||
514 | send_end: | |
515 | ret = sk_stream_error(sk, msg->msg_flags, ret); | |
516 | ||
517 | release_sock(sk); | |
518 | return copied ? copied : ret; | |
519 | } | |
520 | ||
521 | int tls_sw_sendpage(struct sock *sk, struct page *page, | |
522 | int offset, size_t size, int flags) | |
523 | { | |
524 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
525 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
526 | int ret = 0; | |
527 | long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); | |
528 | bool eor; | |
529 | size_t orig_size = size; | |
530 | unsigned char record_type = TLS_RECORD_TYPE_DATA; | |
531 | struct scatterlist *sg; | |
532 | bool full_record; | |
533 | int record_room; | |
534 | ||
535 | if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | | |
536 | MSG_SENDPAGE_NOTLAST)) | |
537 | return -ENOTSUPP; | |
538 | ||
539 | /* No MSG_EOR from splice, only look at MSG_MORE */ | |
540 | eor = !(flags & (MSG_MORE | MSG_SENDPAGE_NOTLAST)); | |
541 | ||
542 | lock_sock(sk); | |
543 | ||
544 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
545 | ||
546 | if (tls_complete_pending_work(sk, tls_ctx, flags, &timeo)) | |
547 | goto sendpage_end; | |
548 | ||
549 | /* Call the sk_stream functions to manage the sndbuf mem. */ | |
550 | while (size > 0) { | |
551 | size_t copy, required_size; | |
552 | ||
553 | if (sk->sk_err) { | |
30be8f8d | 554 | ret = -sk->sk_err; |
3c4d7559 DW |
555 | goto sendpage_end; |
556 | } | |
557 | ||
558 | full_record = false; | |
559 | record_room = TLS_MAX_PAYLOAD_SIZE - ctx->sg_plaintext_size; | |
560 | copy = size; | |
561 | if (copy >= record_room) { | |
562 | copy = record_room; | |
563 | full_record = true; | |
564 | } | |
565 | required_size = ctx->sg_plaintext_size + copy + | |
dbe42559 | 566 | tls_ctx->tx.overhead_size; |
3c4d7559 DW |
567 | |
568 | if (!sk_stream_memory_free(sk)) | |
569 | goto wait_for_sndbuf; | |
570 | alloc_payload: | |
571 | ret = alloc_encrypted_sg(sk, required_size); | |
572 | if (ret) { | |
573 | if (ret != -ENOSPC) | |
574 | goto wait_for_memory; | |
575 | ||
576 | /* Adjust copy according to the amount that was | |
577 | * actually allocated. The difference is due | |
578 | * to max sg elements limit | |
579 | */ | |
580 | copy -= required_size - ctx->sg_plaintext_size; | |
581 | full_record = true; | |
582 | } | |
583 | ||
584 | get_page(page); | |
585 | sg = ctx->sg_plaintext_data + ctx->sg_plaintext_num_elem; | |
586 | sg_set_page(sg, page, copy, offset); | |
7a8c4dd9 DW |
587 | sg_unmark_end(sg); |
588 | ||
3c4d7559 DW |
589 | ctx->sg_plaintext_num_elem++; |
590 | ||
591 | sk_mem_charge(sk, copy); | |
592 | offset += copy; | |
593 | size -= copy; | |
594 | ctx->sg_plaintext_size += copy; | |
595 | tls_ctx->pending_open_record_frags = ctx->sg_plaintext_num_elem; | |
596 | ||
597 | if (full_record || eor || | |
598 | ctx->sg_plaintext_num_elem == | |
599 | ARRAY_SIZE(ctx->sg_plaintext_data)) { | |
600 | push_record: | |
601 | ret = tls_push_record(sk, flags, record_type); | |
602 | if (ret) { | |
603 | if (ret == -ENOMEM) | |
604 | goto wait_for_memory; | |
605 | ||
606 | goto sendpage_end; | |
607 | } | |
608 | } | |
609 | continue; | |
610 | wait_for_sndbuf: | |
611 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
612 | wait_for_memory: | |
613 | ret = sk_stream_wait_memory(sk, &timeo); | |
614 | if (ret) { | |
615 | trim_both_sgl(sk, ctx->sg_plaintext_size); | |
616 | goto sendpage_end; | |
617 | } | |
618 | ||
619 | if (tls_is_pending_closed_record(tls_ctx)) | |
620 | goto push_record; | |
621 | ||
622 | goto alloc_payload; | |
623 | } | |
624 | ||
625 | sendpage_end: | |
626 | if (orig_size > size) | |
627 | ret = orig_size - size; | |
628 | else | |
629 | ret = sk_stream_error(sk, flags, ret); | |
630 | ||
631 | release_sock(sk); | |
632 | return ret; | |
633 | } | |
634 | ||
c46234eb DW |
635 | static struct sk_buff *tls_wait_data(struct sock *sk, int flags, |
636 | long timeo, int *err) | |
637 | { | |
638 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
639 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
640 | struct sk_buff *skb; | |
641 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
642 | ||
643 | while (!(skb = ctx->recv_pkt)) { | |
644 | if (sk->sk_err) { | |
645 | *err = sock_error(sk); | |
646 | return NULL; | |
647 | } | |
648 | ||
649 | if (sock_flag(sk, SOCK_DONE)) | |
650 | return NULL; | |
651 | ||
652 | if ((flags & MSG_DONTWAIT) || !timeo) { | |
653 | *err = -EAGAIN; | |
654 | return NULL; | |
655 | } | |
656 | ||
657 | add_wait_queue(sk_sleep(sk), &wait); | |
658 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
659 | sk_wait_event(sk, &timeo, ctx->recv_pkt != skb, &wait); | |
660 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
661 | remove_wait_queue(sk_sleep(sk), &wait); | |
662 | ||
663 | /* Handle signals */ | |
664 | if (signal_pending(current)) { | |
665 | *err = sock_intr_errno(timeo); | |
666 | return NULL; | |
667 | } | |
668 | } | |
669 | ||
670 | return skb; | |
671 | } | |
672 | ||
673 | static int decrypt_skb(struct sock *sk, struct sk_buff *skb, | |
674 | struct scatterlist *sgout) | |
675 | { | |
676 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
677 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
b16520f7 | 678 | char iv[TLS_CIPHER_AES_GCM_128_SALT_SIZE + MAX_IV_SIZE]; |
c46234eb DW |
679 | struct scatterlist sgin_arr[MAX_SKB_FRAGS + 2]; |
680 | struct scatterlist *sgin = &sgin_arr[0]; | |
681 | struct strp_msg *rxm = strp_msg(skb); | |
682 | int ret, nsg = ARRAY_SIZE(sgin_arr); | |
683 | char aad_recv[TLS_AAD_SPACE_SIZE]; | |
684 | struct sk_buff *unused; | |
685 | ||
686 | ret = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE, | |
687 | iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, | |
688 | tls_ctx->rx.iv_size); | |
689 | if (ret < 0) | |
690 | return ret; | |
691 | ||
692 | memcpy(iv, tls_ctx->rx.iv, TLS_CIPHER_AES_GCM_128_SALT_SIZE); | |
693 | if (!sgout) { | |
694 | nsg = skb_cow_data(skb, 0, &unused) + 1; | |
695 | sgin = kmalloc_array(nsg, sizeof(*sgin), sk->sk_allocation); | |
95ad7544 | 696 | sgout = sgin; |
c46234eb DW |
697 | } |
698 | ||
699 | sg_init_table(sgin, nsg); | |
700 | sg_set_buf(&sgin[0], aad_recv, sizeof(aad_recv)); | |
701 | ||
702 | nsg = skb_to_sgvec(skb, &sgin[1], | |
703 | rxm->offset + tls_ctx->rx.prepend_size, | |
704 | rxm->full_len - tls_ctx->rx.prepend_size); | |
705 | ||
706 | tls_make_aad(aad_recv, | |
707 | rxm->full_len - tls_ctx->rx.overhead_size, | |
708 | tls_ctx->rx.rec_seq, | |
709 | tls_ctx->rx.rec_seq_size, | |
710 | ctx->control); | |
711 | ||
712 | ret = tls_do_decryption(sk, sgin, sgout, iv, | |
713 | rxm->full_len - tls_ctx->rx.overhead_size, | |
714 | skb, sk->sk_allocation); | |
715 | ||
716 | if (sgin != &sgin_arr[0]) | |
717 | kfree(sgin); | |
718 | ||
719 | return ret; | |
720 | } | |
721 | ||
722 | static bool tls_sw_advance_skb(struct sock *sk, struct sk_buff *skb, | |
723 | unsigned int len) | |
724 | { | |
725 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
726 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
727 | struct strp_msg *rxm = strp_msg(skb); | |
728 | ||
729 | if (len < rxm->full_len) { | |
730 | rxm->offset += len; | |
731 | rxm->full_len -= len; | |
732 | ||
733 | return false; | |
734 | } | |
735 | ||
736 | /* Finished with message */ | |
737 | ctx->recv_pkt = NULL; | |
738 | kfree_skb(skb); | |
739 | strp_unpause(&ctx->strp); | |
740 | ||
741 | return true; | |
742 | } | |
743 | ||
744 | int tls_sw_recvmsg(struct sock *sk, | |
745 | struct msghdr *msg, | |
746 | size_t len, | |
747 | int nonblock, | |
748 | int flags, | |
749 | int *addr_len) | |
750 | { | |
751 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
752 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
753 | unsigned char control; | |
754 | struct strp_msg *rxm; | |
755 | struct sk_buff *skb; | |
756 | ssize_t copied = 0; | |
757 | bool cmsg = false; | |
758 | int err = 0; | |
759 | long timeo; | |
760 | ||
761 | flags |= nonblock; | |
762 | ||
763 | if (unlikely(flags & MSG_ERRQUEUE)) | |
764 | return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR); | |
765 | ||
766 | lock_sock(sk); | |
767 | ||
768 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
769 | do { | |
770 | bool zc = false; | |
771 | int chunk = 0; | |
772 | ||
773 | skb = tls_wait_data(sk, flags, timeo, &err); | |
774 | if (!skb) | |
775 | goto recv_end; | |
776 | ||
777 | rxm = strp_msg(skb); | |
778 | if (!cmsg) { | |
779 | int cerr; | |
780 | ||
781 | cerr = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE, | |
782 | sizeof(ctx->control), &ctx->control); | |
783 | cmsg = true; | |
784 | control = ctx->control; | |
785 | if (ctx->control != TLS_RECORD_TYPE_DATA) { | |
786 | if (cerr || msg->msg_flags & MSG_CTRUNC) { | |
787 | err = -EIO; | |
788 | goto recv_end; | |
789 | } | |
790 | } | |
791 | } else if (control != ctx->control) { | |
792 | goto recv_end; | |
793 | } | |
794 | ||
795 | if (!ctx->decrypted) { | |
796 | int page_count; | |
797 | int to_copy; | |
798 | ||
799 | page_count = iov_iter_npages(&msg->msg_iter, | |
800 | MAX_SKB_FRAGS); | |
801 | to_copy = rxm->full_len - tls_ctx->rx.overhead_size; | |
802 | if (to_copy <= len && page_count < MAX_SKB_FRAGS && | |
803 | likely(!(flags & MSG_PEEK))) { | |
804 | struct scatterlist sgin[MAX_SKB_FRAGS + 1]; | |
805 | char unused[21]; | |
806 | int pages = 0; | |
807 | ||
808 | zc = true; | |
809 | sg_init_table(sgin, MAX_SKB_FRAGS + 1); | |
810 | sg_set_buf(&sgin[0], unused, 13); | |
811 | ||
812 | err = zerocopy_from_iter(sk, &msg->msg_iter, | |
813 | to_copy, &pages, | |
814 | &chunk, &sgin[1], | |
815 | MAX_SKB_FRAGS, false); | |
816 | if (err < 0) | |
817 | goto fallback_to_reg_recv; | |
818 | ||
819 | err = decrypt_skb(sk, skb, sgin); | |
820 | for (; pages > 0; pages--) | |
821 | put_page(sg_page(&sgin[pages])); | |
822 | if (err < 0) { | |
823 | tls_err_abort(sk, EBADMSG); | |
824 | goto recv_end; | |
825 | } | |
826 | } else { | |
827 | fallback_to_reg_recv: | |
828 | err = decrypt_skb(sk, skb, NULL); | |
829 | if (err < 0) { | |
830 | tls_err_abort(sk, EBADMSG); | |
831 | goto recv_end; | |
832 | } | |
833 | } | |
834 | ctx->decrypted = true; | |
835 | } | |
836 | ||
837 | if (!zc) { | |
838 | chunk = min_t(unsigned int, rxm->full_len, len); | |
839 | err = skb_copy_datagram_msg(skb, rxm->offset, msg, | |
840 | chunk); | |
841 | if (err < 0) | |
842 | goto recv_end; | |
843 | } | |
844 | ||
845 | copied += chunk; | |
846 | len -= chunk; | |
847 | if (likely(!(flags & MSG_PEEK))) { | |
848 | u8 control = ctx->control; | |
849 | ||
850 | if (tls_sw_advance_skb(sk, skb, chunk)) { | |
851 | /* Return full control message to | |
852 | * userspace before trying to parse | |
853 | * another message type | |
854 | */ | |
855 | msg->msg_flags |= MSG_EOR; | |
856 | if (control != TLS_RECORD_TYPE_DATA) | |
857 | goto recv_end; | |
858 | } | |
859 | } | |
860 | } while (len); | |
861 | ||
862 | recv_end: | |
863 | release_sock(sk); | |
864 | return copied ? : err; | |
865 | } | |
866 | ||
867 | ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos, | |
868 | struct pipe_inode_info *pipe, | |
869 | size_t len, unsigned int flags) | |
870 | { | |
871 | struct tls_context *tls_ctx = tls_get_ctx(sock->sk); | |
872 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
873 | struct strp_msg *rxm = NULL; | |
874 | struct sock *sk = sock->sk; | |
875 | struct sk_buff *skb; | |
876 | ssize_t copied = 0; | |
877 | int err = 0; | |
878 | long timeo; | |
879 | int chunk; | |
880 | ||
881 | lock_sock(sk); | |
882 | ||
883 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
884 | ||
885 | skb = tls_wait_data(sk, flags, timeo, &err); | |
886 | if (!skb) | |
887 | goto splice_read_end; | |
888 | ||
889 | /* splice does not support reading control messages */ | |
890 | if (ctx->control != TLS_RECORD_TYPE_DATA) { | |
891 | err = -ENOTSUPP; | |
892 | goto splice_read_end; | |
893 | } | |
894 | ||
895 | if (!ctx->decrypted) { | |
896 | err = decrypt_skb(sk, skb, NULL); | |
897 | ||
898 | if (err < 0) { | |
899 | tls_err_abort(sk, EBADMSG); | |
900 | goto splice_read_end; | |
901 | } | |
902 | ctx->decrypted = true; | |
903 | } | |
904 | rxm = strp_msg(skb); | |
905 | ||
906 | chunk = min_t(unsigned int, rxm->full_len, len); | |
907 | copied = skb_splice_bits(skb, sk, rxm->offset, pipe, chunk, flags); | |
908 | if (copied < 0) | |
909 | goto splice_read_end; | |
910 | ||
911 | if (likely(!(flags & MSG_PEEK))) | |
912 | tls_sw_advance_skb(sk, skb, copied); | |
913 | ||
914 | splice_read_end: | |
915 | release_sock(sk); | |
916 | return copied ? : err; | |
917 | } | |
918 | ||
919 | unsigned int tls_sw_poll(struct file *file, struct socket *sock, | |
920 | struct poll_table_struct *wait) | |
921 | { | |
922 | unsigned int ret; | |
923 | struct sock *sk = sock->sk; | |
924 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
925 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
926 | ||
927 | /* Grab POLLOUT and POLLHUP from the underlying socket */ | |
928 | ret = ctx->sk_poll(file, sock, wait); | |
929 | ||
930 | /* Clear POLLIN bits, and set based on recv_pkt */ | |
931 | ret &= ~(POLLIN | POLLRDNORM); | |
932 | if (ctx->recv_pkt) | |
933 | ret |= POLLIN | POLLRDNORM; | |
934 | ||
935 | return ret; | |
936 | } | |
937 | ||
938 | static int tls_read_size(struct strparser *strp, struct sk_buff *skb) | |
939 | { | |
940 | struct tls_context *tls_ctx = tls_get_ctx(strp->sk); | |
941 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
942 | char header[tls_ctx->rx.prepend_size]; | |
943 | struct strp_msg *rxm = strp_msg(skb); | |
944 | size_t cipher_overhead; | |
945 | size_t data_len = 0; | |
946 | int ret; | |
947 | ||
948 | /* Verify that we have a full TLS header, or wait for more data */ | |
949 | if (rxm->offset + tls_ctx->rx.prepend_size > skb->len) | |
950 | return 0; | |
951 | ||
952 | /* Linearize header to local buffer */ | |
953 | ret = skb_copy_bits(skb, rxm->offset, header, tls_ctx->rx.prepend_size); | |
954 | ||
955 | if (ret < 0) | |
956 | goto read_failure; | |
957 | ||
958 | ctx->control = header[0]; | |
959 | ||
960 | data_len = ((header[4] & 0xFF) | (header[3] << 8)); | |
961 | ||
962 | cipher_overhead = tls_ctx->rx.tag_size + tls_ctx->rx.iv_size; | |
963 | ||
964 | if (data_len > TLS_MAX_PAYLOAD_SIZE + cipher_overhead) { | |
965 | ret = -EMSGSIZE; | |
966 | goto read_failure; | |
967 | } | |
968 | if (data_len < cipher_overhead) { | |
969 | ret = -EBADMSG; | |
970 | goto read_failure; | |
971 | } | |
972 | ||
973 | if (header[1] != TLS_VERSION_MINOR(tls_ctx->crypto_recv.version) || | |
974 | header[2] != TLS_VERSION_MAJOR(tls_ctx->crypto_recv.version)) { | |
975 | ret = -EINVAL; | |
976 | goto read_failure; | |
977 | } | |
978 | ||
979 | return data_len + TLS_HEADER_SIZE; | |
980 | ||
981 | read_failure: | |
982 | tls_err_abort(strp->sk, ret); | |
983 | ||
984 | return ret; | |
985 | } | |
986 | ||
987 | static void tls_queue(struct strparser *strp, struct sk_buff *skb) | |
988 | { | |
989 | struct tls_context *tls_ctx = tls_get_ctx(strp->sk); | |
990 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
991 | struct strp_msg *rxm; | |
992 | ||
993 | rxm = strp_msg(skb); | |
994 | ||
995 | ctx->decrypted = false; | |
996 | ||
997 | ctx->recv_pkt = skb; | |
998 | strp_pause(strp); | |
999 | ||
1000 | strp->sk->sk_state_change(strp->sk); | |
1001 | } | |
1002 | ||
1003 | static void tls_data_ready(struct sock *sk) | |
1004 | { | |
1005 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1006 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
1007 | ||
1008 | strp_data_ready(&ctx->strp); | |
1009 | } | |
1010 | ||
1011 | void tls_sw_free_resources(struct sock *sk) | |
3c4d7559 DW |
1012 | { |
1013 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1014 | struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); | |
1015 | ||
1016 | if (ctx->aead_send) | |
1017 | crypto_free_aead(ctx->aead_send); | |
c46234eb DW |
1018 | if (ctx->aead_recv) { |
1019 | if (ctx->recv_pkt) { | |
1020 | kfree_skb(ctx->recv_pkt); | |
1021 | ctx->recv_pkt = NULL; | |
1022 | } | |
1023 | crypto_free_aead(ctx->aead_recv); | |
1024 | strp_stop(&ctx->strp); | |
1025 | write_lock_bh(&sk->sk_callback_lock); | |
1026 | sk->sk_data_ready = ctx->saved_data_ready; | |
1027 | write_unlock_bh(&sk->sk_callback_lock); | |
1028 | release_sock(sk); | |
1029 | strp_done(&ctx->strp); | |
1030 | lock_sock(sk); | |
1031 | } | |
3c4d7559 DW |
1032 | |
1033 | tls_free_both_sg(sk); | |
1034 | ||
1035 | kfree(ctx); | |
ff45d820 | 1036 | kfree(tls_ctx); |
3c4d7559 DW |
1037 | } |
1038 | ||
c46234eb | 1039 | int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx) |
3c4d7559 DW |
1040 | { |
1041 | char keyval[TLS_CIPHER_AES_GCM_128_KEY_SIZE]; | |
1042 | struct tls_crypto_info *crypto_info; | |
1043 | struct tls12_crypto_info_aes_gcm_128 *gcm_128_info; | |
1044 | struct tls_sw_context *sw_ctx; | |
c46234eb DW |
1045 | struct cipher_context *cctx; |
1046 | struct crypto_aead **aead; | |
1047 | struct strp_callbacks cb; | |
3c4d7559 DW |
1048 | u16 nonce_size, tag_size, iv_size, rec_seq_size; |
1049 | char *iv, *rec_seq; | |
1050 | int rc = 0; | |
1051 | ||
1052 | if (!ctx) { | |
1053 | rc = -EINVAL; | |
1054 | goto out; | |
1055 | } | |
1056 | ||
c46234eb DW |
1057 | if (!ctx->priv_ctx) { |
1058 | sw_ctx = kzalloc(sizeof(*sw_ctx), GFP_KERNEL); | |
1059 | if (!sw_ctx) { | |
1060 | rc = -ENOMEM; | |
1061 | goto out; | |
1062 | } | |
1063 | crypto_init_wait(&sw_ctx->async_wait); | |
1064 | } else { | |
1065 | sw_ctx = ctx->priv_ctx; | |
3c4d7559 DW |
1066 | } |
1067 | ||
1068 | ctx->priv_ctx = (struct tls_offload_context *)sw_ctx; | |
3c4d7559 | 1069 | |
c46234eb DW |
1070 | if (tx) { |
1071 | crypto_info = &ctx->crypto_send; | |
1072 | cctx = &ctx->tx; | |
1073 | aead = &sw_ctx->aead_send; | |
1074 | } else { | |
1075 | crypto_info = &ctx->crypto_recv; | |
1076 | cctx = &ctx->rx; | |
1077 | aead = &sw_ctx->aead_recv; | |
1078 | } | |
1079 | ||
3c4d7559 DW |
1080 | switch (crypto_info->cipher_type) { |
1081 | case TLS_CIPHER_AES_GCM_128: { | |
1082 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
1083 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
1084 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
1085 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; | |
1086 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; | |
1087 | rec_seq = | |
1088 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; | |
1089 | gcm_128_info = | |
1090 | (struct tls12_crypto_info_aes_gcm_128 *)crypto_info; | |
1091 | break; | |
1092 | } | |
1093 | default: | |
1094 | rc = -EINVAL; | |
cf6d43ef | 1095 | goto free_priv; |
3c4d7559 DW |
1096 | } |
1097 | ||
b16520f7 KC |
1098 | /* Sanity-check the IV size for stack allocations. */ |
1099 | if (iv_size > MAX_IV_SIZE) { | |
1100 | rc = -EINVAL; | |
1101 | goto free_priv; | |
1102 | } | |
1103 | ||
c46234eb DW |
1104 | cctx->prepend_size = TLS_HEADER_SIZE + nonce_size; |
1105 | cctx->tag_size = tag_size; | |
1106 | cctx->overhead_size = cctx->prepend_size + cctx->tag_size; | |
1107 | cctx->iv_size = iv_size; | |
1108 | cctx->iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE, | |
1109 | GFP_KERNEL); | |
1110 | if (!cctx->iv) { | |
3c4d7559 | 1111 | rc = -ENOMEM; |
cf6d43ef | 1112 | goto free_priv; |
3c4d7559 | 1113 | } |
c46234eb DW |
1114 | memcpy(cctx->iv, gcm_128_info->salt, TLS_CIPHER_AES_GCM_128_SALT_SIZE); |
1115 | memcpy(cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size); | |
1116 | cctx->rec_seq_size = rec_seq_size; | |
1117 | cctx->rec_seq = kmalloc(rec_seq_size, GFP_KERNEL); | |
1118 | if (!cctx->rec_seq) { | |
3c4d7559 DW |
1119 | rc = -ENOMEM; |
1120 | goto free_iv; | |
1121 | } | |
c46234eb DW |
1122 | memcpy(cctx->rec_seq, rec_seq, rec_seq_size); |
1123 | ||
1124 | if (tx) { | |
1125 | sg_init_table(sw_ctx->sg_encrypted_data, | |
1126 | ARRAY_SIZE(sw_ctx->sg_encrypted_data)); | |
1127 | sg_init_table(sw_ctx->sg_plaintext_data, | |
1128 | ARRAY_SIZE(sw_ctx->sg_plaintext_data)); | |
1129 | ||
1130 | sg_init_table(sw_ctx->sg_aead_in, 2); | |
1131 | sg_set_buf(&sw_ctx->sg_aead_in[0], sw_ctx->aad_space, | |
1132 | sizeof(sw_ctx->aad_space)); | |
1133 | sg_unmark_end(&sw_ctx->sg_aead_in[1]); | |
1134 | sg_chain(sw_ctx->sg_aead_in, 2, sw_ctx->sg_plaintext_data); | |
1135 | sg_init_table(sw_ctx->sg_aead_out, 2); | |
1136 | sg_set_buf(&sw_ctx->sg_aead_out[0], sw_ctx->aad_space, | |
1137 | sizeof(sw_ctx->aad_space)); | |
1138 | sg_unmark_end(&sw_ctx->sg_aead_out[1]); | |
1139 | sg_chain(sw_ctx->sg_aead_out, 2, sw_ctx->sg_encrypted_data); | |
1140 | } | |
1141 | ||
1142 | if (!*aead) { | |
1143 | *aead = crypto_alloc_aead("gcm(aes)", 0, 0); | |
1144 | if (IS_ERR(*aead)) { | |
1145 | rc = PTR_ERR(*aead); | |
1146 | *aead = NULL; | |
3c4d7559 DW |
1147 | goto free_rec_seq; |
1148 | } | |
1149 | } | |
1150 | ||
1151 | ctx->push_pending_record = tls_sw_push_pending_record; | |
1152 | ||
1153 | memcpy(keyval, gcm_128_info->key, TLS_CIPHER_AES_GCM_128_KEY_SIZE); | |
1154 | ||
c46234eb | 1155 | rc = crypto_aead_setkey(*aead, keyval, |
3c4d7559 DW |
1156 | TLS_CIPHER_AES_GCM_128_KEY_SIZE); |
1157 | if (rc) | |
1158 | goto free_aead; | |
1159 | ||
c46234eb DW |
1160 | rc = crypto_aead_setauthsize(*aead, cctx->tag_size); |
1161 | if (rc) | |
1162 | goto free_aead; | |
1163 | ||
1164 | if (!tx) { | |
1165 | /* Set up strparser */ | |
1166 | memset(&cb, 0, sizeof(cb)); | |
1167 | cb.rcv_msg = tls_queue; | |
1168 | cb.parse_msg = tls_read_size; | |
1169 | ||
1170 | strp_init(&sw_ctx->strp, sk, &cb); | |
1171 | ||
1172 | write_lock_bh(&sk->sk_callback_lock); | |
1173 | sw_ctx->saved_data_ready = sk->sk_data_ready; | |
1174 | sk->sk_data_ready = tls_data_ready; | |
1175 | write_unlock_bh(&sk->sk_callback_lock); | |
1176 | ||
1177 | sw_ctx->sk_poll = sk->sk_socket->ops->poll; | |
1178 | ||
1179 | strp_check_rcv(&sw_ctx->strp); | |
1180 | } | |
1181 | ||
1182 | goto out; | |
3c4d7559 DW |
1183 | |
1184 | free_aead: | |
c46234eb DW |
1185 | crypto_free_aead(*aead); |
1186 | *aead = NULL; | |
3c4d7559 | 1187 | free_rec_seq: |
c46234eb DW |
1188 | kfree(cctx->rec_seq); |
1189 | cctx->rec_seq = NULL; | |
3c4d7559 | 1190 | free_iv: |
dbe42559 DW |
1191 | kfree(ctx->tx.iv); |
1192 | ctx->tx.iv = NULL; | |
cf6d43ef SD |
1193 | free_priv: |
1194 | kfree(ctx->priv_ctx); | |
1195 | ctx->priv_ctx = NULL; | |
3c4d7559 DW |
1196 | out: |
1197 | return rc; | |
1198 | } |