]>
Commit | Line | Data |
---|---|---|
78368575 DB |
1 | /* |
2 | * QEMU block full disk encryption | |
3 | * | |
4 | * Copyright (c) 2015-2016 Red Hat, Inc. | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include "qemu/osdep.h" | |
22 | ||
23 | #include "block/block_int.h" | |
24 | #include "sysemu/block-backend.h" | |
25 | #include "crypto/block.h" | |
26 | #include "qapi/opts-visitor.h" | |
9af23989 | 27 | #include "qapi/qapi-visit-crypto.h" |
452fcdbc | 28 | #include "qapi/qmp/qdict.h" |
306a06e5 | 29 | #include "qapi/qobject-input-visitor.h" |
78368575 | 30 | #include "qapi/error.h" |
922a01a0 | 31 | #include "qemu/option.h" |
306a06e5 | 32 | #include "block/crypto.h" |
78368575 DB |
33 | |
34 | typedef struct BlockCrypto BlockCrypto; | |
35 | ||
36 | struct BlockCrypto { | |
37 | QCryptoBlock *block; | |
38 | }; | |
39 | ||
40 | ||
41 | static int block_crypto_probe_generic(QCryptoBlockFormat format, | |
42 | const uint8_t *buf, | |
43 | int buf_size, | |
44 | const char *filename) | |
45 | { | |
46 | if (qcrypto_block_has_format(format, buf, buf_size)) { | |
47 | return 100; | |
48 | } else { | |
49 | return 0; | |
50 | } | |
51 | } | |
52 | ||
53 | ||
54 | static ssize_t block_crypto_read_func(QCryptoBlock *block, | |
55 | size_t offset, | |
56 | uint8_t *buf, | |
57 | size_t buflen, | |
e4a3507e | 58 | void *opaque, |
37509233 | 59 | Error **errp) |
78368575 DB |
60 | { |
61 | BlockDriverState *bs = opaque; | |
62 | ssize_t ret; | |
63 | ||
cf2ab8fc | 64 | ret = bdrv_pread(bs->file, offset, buf, buflen); |
78368575 DB |
65 | if (ret < 0) { |
66 | error_setg_errno(errp, -ret, "Could not read encryption header"); | |
67 | return ret; | |
68 | } | |
69 | return ret; | |
70 | } | |
71 | ||
72 | ||
73 | struct BlockCryptoCreateData { | |
74 | const char *filename; | |
75 | QemuOpts *opts; | |
76 | BlockBackend *blk; | |
77 | uint64_t size; | |
78 | }; | |
79 | ||
80 | ||
81 | static ssize_t block_crypto_write_func(QCryptoBlock *block, | |
82 | size_t offset, | |
83 | const uint8_t *buf, | |
84 | size_t buflen, | |
e4a3507e | 85 | void *opaque, |
37509233 | 86 | Error **errp) |
78368575 DB |
87 | { |
88 | struct BlockCryptoCreateData *data = opaque; | |
89 | ssize_t ret; | |
90 | ||
8341f00d | 91 | ret = blk_pwrite(data->blk, offset, buf, buflen, 0); |
78368575 DB |
92 | if (ret < 0) { |
93 | error_setg_errno(errp, -ret, "Could not write encryption header"); | |
94 | return ret; | |
95 | } | |
96 | return ret; | |
97 | } | |
98 | ||
99 | ||
100 | static ssize_t block_crypto_init_func(QCryptoBlock *block, | |
101 | size_t headerlen, | |
e4a3507e | 102 | void *opaque, |
37509233 | 103 | Error **errp) |
78368575 DB |
104 | { |
105 | struct BlockCryptoCreateData *data = opaque; | |
106 | int ret; | |
107 | ||
108 | /* User provided size should reflect amount of space made | |
109 | * available to the guest, so we must take account of that | |
110 | * which will be used by the crypto header | |
111 | */ | |
112 | data->size += headerlen; | |
113 | ||
114 | qemu_opt_set_number(data->opts, BLOCK_OPT_SIZE, data->size, &error_abort); | |
115 | ret = bdrv_create_file(data->filename, data->opts, errp); | |
116 | if (ret < 0) { | |
117 | return -1; | |
118 | } | |
119 | ||
120 | data->blk = blk_new_open(data->filename, NULL, NULL, | |
72e775c7 | 121 | BDRV_O_RDWR | BDRV_O_PROTOCOL, errp); |
78368575 DB |
122 | if (!data->blk) { |
123 | return -1; | |
124 | } | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | ||
130 | static QemuOptsList block_crypto_runtime_opts_luks = { | |
131 | .name = "crypto", | |
132 | .head = QTAILQ_HEAD_INITIALIZER(block_crypto_runtime_opts_luks.head), | |
133 | .desc = { | |
4a47f854 | 134 | BLOCK_CRYPTO_OPT_DEF_LUKS_KEY_SECRET(""), |
78368575 DB |
135 | { /* end of list */ } |
136 | }, | |
137 | }; | |
138 | ||
139 | ||
140 | static QemuOptsList block_crypto_create_opts_luks = { | |
141 | .name = "crypto", | |
142 | .head = QTAILQ_HEAD_INITIALIZER(block_crypto_create_opts_luks.head), | |
143 | .desc = { | |
144 | { | |
145 | .name = BLOCK_OPT_SIZE, | |
146 | .type = QEMU_OPT_SIZE, | |
147 | .help = "Virtual disk size" | |
148 | }, | |
4a47f854 DB |
149 | BLOCK_CRYPTO_OPT_DEF_LUKS_KEY_SECRET(""), |
150 | BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_ALG(""), | |
151 | BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_MODE(""), | |
152 | BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_ALG(""), | |
153 | BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_HASH_ALG(""), | |
154 | BLOCK_CRYPTO_OPT_DEF_LUKS_HASH_ALG(""), | |
155 | BLOCK_CRYPTO_OPT_DEF_LUKS_ITER_TIME(""), | |
78368575 DB |
156 | { /* end of list */ } |
157 | }, | |
158 | }; | |
159 | ||
160 | ||
306a06e5 | 161 | QCryptoBlockOpenOptions * |
78368575 | 162 | block_crypto_open_opts_init(QCryptoBlockFormat format, |
306a06e5 | 163 | QDict *opts, |
78368575 DB |
164 | Error **errp) |
165 | { | |
09204eac | 166 | Visitor *v; |
78368575 DB |
167 | QCryptoBlockOpenOptions *ret = NULL; |
168 | Error *local_err = NULL; | |
169 | ||
170 | ret = g_new0(QCryptoBlockOpenOptions, 1); | |
171 | ret->format = format; | |
172 | ||
306a06e5 | 173 | v = qobject_input_visitor_new_keyval(QOBJECT(opts)); |
78368575 | 174 | |
09204eac | 175 | visit_start_struct(v, NULL, NULL, 0, &local_err); |
78368575 DB |
176 | if (local_err) { |
177 | goto out; | |
178 | } | |
179 | ||
180 | switch (format) { | |
181 | case Q_CRYPTO_BLOCK_FORMAT_LUKS: | |
182 | visit_type_QCryptoBlockOptionsLUKS_members( | |
09204eac | 183 | v, &ret->u.luks, &local_err); |
78368575 DB |
184 | break; |
185 | ||
d85f4222 DB |
186 | case Q_CRYPTO_BLOCK_FORMAT_QCOW: |
187 | visit_type_QCryptoBlockOptionsQCow_members( | |
188 | v, &ret->u.qcow, &local_err); | |
189 | break; | |
190 | ||
78368575 DB |
191 | default: |
192 | error_setg(&local_err, "Unsupported block format %d", format); | |
193 | break; | |
194 | } | |
15c2f669 | 195 | if (!local_err) { |
09204eac | 196 | visit_check_struct(v, &local_err); |
15c2f669 | 197 | } |
78368575 | 198 | |
09204eac | 199 | visit_end_struct(v, NULL); |
78368575 DB |
200 | |
201 | out: | |
202 | if (local_err) { | |
203 | error_propagate(errp, local_err); | |
204 | qapi_free_QCryptoBlockOpenOptions(ret); | |
205 | ret = NULL; | |
206 | } | |
09204eac | 207 | visit_free(v); |
78368575 DB |
208 | return ret; |
209 | } | |
210 | ||
211 | ||
306a06e5 | 212 | QCryptoBlockCreateOptions * |
78368575 | 213 | block_crypto_create_opts_init(QCryptoBlockFormat format, |
306a06e5 | 214 | QDict *opts, |
78368575 DB |
215 | Error **errp) |
216 | { | |
09204eac | 217 | Visitor *v; |
78368575 DB |
218 | QCryptoBlockCreateOptions *ret = NULL; |
219 | Error *local_err = NULL; | |
220 | ||
221 | ret = g_new0(QCryptoBlockCreateOptions, 1); | |
222 | ret->format = format; | |
223 | ||
306a06e5 | 224 | v = qobject_input_visitor_new_keyval(QOBJECT(opts)); |
78368575 | 225 | |
09204eac | 226 | visit_start_struct(v, NULL, NULL, 0, &local_err); |
78368575 DB |
227 | if (local_err) { |
228 | goto out; | |
229 | } | |
230 | ||
231 | switch (format) { | |
232 | case Q_CRYPTO_BLOCK_FORMAT_LUKS: | |
233 | visit_type_QCryptoBlockCreateOptionsLUKS_members( | |
09204eac | 234 | v, &ret->u.luks, &local_err); |
78368575 DB |
235 | break; |
236 | ||
d85f4222 DB |
237 | case Q_CRYPTO_BLOCK_FORMAT_QCOW: |
238 | visit_type_QCryptoBlockOptionsQCow_members( | |
239 | v, &ret->u.qcow, &local_err); | |
240 | break; | |
241 | ||
78368575 DB |
242 | default: |
243 | error_setg(&local_err, "Unsupported block format %d", format); | |
244 | break; | |
245 | } | |
15c2f669 | 246 | if (!local_err) { |
09204eac | 247 | visit_check_struct(v, &local_err); |
15c2f669 | 248 | } |
78368575 | 249 | |
09204eac | 250 | visit_end_struct(v, NULL); |
78368575 DB |
251 | |
252 | out: | |
253 | if (local_err) { | |
254 | error_propagate(errp, local_err); | |
255 | qapi_free_QCryptoBlockCreateOptions(ret); | |
256 | ret = NULL; | |
257 | } | |
09204eac | 258 | visit_free(v); |
78368575 DB |
259 | return ret; |
260 | } | |
261 | ||
262 | ||
263 | static int block_crypto_open_generic(QCryptoBlockFormat format, | |
264 | QemuOptsList *opts_spec, | |
265 | BlockDriverState *bs, | |
266 | QDict *options, | |
267 | int flags, | |
268 | Error **errp) | |
269 | { | |
270 | BlockCrypto *crypto = bs->opaque; | |
271 | QemuOpts *opts = NULL; | |
272 | Error *local_err = NULL; | |
273 | int ret = -EINVAL; | |
274 | QCryptoBlockOpenOptions *open_opts = NULL; | |
275 | unsigned int cflags = 0; | |
306a06e5 | 276 | QDict *cryptoopts = NULL; |
78368575 | 277 | |
4e4bf5c4 KW |
278 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, |
279 | false, errp); | |
280 | if (!bs->file) { | |
281 | return -EINVAL; | |
282 | } | |
283 | ||
d67a6b09 DB |
284 | bs->supported_write_flags = BDRV_REQ_FUA & |
285 | bs->file->bs->supported_write_flags; | |
286 | ||
78368575 DB |
287 | opts = qemu_opts_create(opts_spec, NULL, 0, &error_abort); |
288 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
289 | if (local_err) { | |
290 | error_propagate(errp, local_err); | |
291 | goto cleanup; | |
292 | } | |
293 | ||
306a06e5 DB |
294 | cryptoopts = qemu_opts_to_qdict(opts, NULL); |
295 | ||
296 | open_opts = block_crypto_open_opts_init(format, cryptoopts, errp); | |
78368575 DB |
297 | if (!open_opts) { |
298 | goto cleanup; | |
299 | } | |
300 | ||
301 | if (flags & BDRV_O_NO_IO) { | |
302 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; | |
303 | } | |
1cd9a787 | 304 | crypto->block = qcrypto_block_open(open_opts, NULL, |
78368575 DB |
305 | block_crypto_read_func, |
306 | bs, | |
307 | cflags, | |
308 | errp); | |
309 | ||
310 | if (!crypto->block) { | |
311 | ret = -EIO; | |
312 | goto cleanup; | |
313 | } | |
314 | ||
54115412 | 315 | bs->encrypted = true; |
78368575 DB |
316 | |
317 | ret = 0; | |
318 | cleanup: | |
306a06e5 | 319 | QDECREF(cryptoopts); |
78368575 DB |
320 | qapi_free_QCryptoBlockOpenOptions(open_opts); |
321 | return ret; | |
322 | } | |
323 | ||
324 | ||
325 | static int block_crypto_create_generic(QCryptoBlockFormat format, | |
326 | const char *filename, | |
327 | QemuOpts *opts, | |
328 | Error **errp) | |
329 | { | |
330 | int ret = -EINVAL; | |
331 | QCryptoBlockCreateOptions *create_opts = NULL; | |
332 | QCryptoBlock *crypto = NULL; | |
333 | struct BlockCryptoCreateData data = { | |
334 | .size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), | |
335 | BDRV_SECTOR_SIZE), | |
336 | .opts = opts, | |
337 | .filename = filename, | |
338 | }; | |
306a06e5 DB |
339 | QDict *cryptoopts; |
340 | ||
341 | cryptoopts = qemu_opts_to_qdict(opts, NULL); | |
78368575 | 342 | |
306a06e5 | 343 | create_opts = block_crypto_create_opts_init(format, cryptoopts, errp); |
78368575 DB |
344 | if (!create_opts) { |
345 | return -1; | |
346 | } | |
347 | ||
1cd9a787 | 348 | crypto = qcrypto_block_create(create_opts, NULL, |
78368575 DB |
349 | block_crypto_init_func, |
350 | block_crypto_write_func, | |
351 | &data, | |
352 | errp); | |
353 | ||
354 | if (!crypto) { | |
355 | ret = -EIO; | |
356 | goto cleanup; | |
357 | } | |
358 | ||
359 | ret = 0; | |
360 | cleanup: | |
306a06e5 | 361 | QDECREF(cryptoopts); |
78368575 DB |
362 | qcrypto_block_free(crypto); |
363 | blk_unref(data.blk); | |
364 | qapi_free_QCryptoBlockCreateOptions(create_opts); | |
365 | return ret; | |
366 | } | |
367 | ||
4bff28b8 | 368 | static int block_crypto_truncate(BlockDriverState *bs, int64_t offset, |
8243ccb7 | 369 | PreallocMode prealloc, Error **errp) |
78368575 DB |
370 | { |
371 | BlockCrypto *crypto = bs->opaque; | |
31376555 | 372 | uint64_t payload_offset = |
78368575 | 373 | qcrypto_block_get_payload_offset(crypto->block); |
31376555 | 374 | assert(payload_offset < (INT64_MAX - offset)); |
78368575 DB |
375 | |
376 | offset += payload_offset; | |
377 | ||
7ea37c30 | 378 | return bdrv_truncate(bs->file, offset, prealloc, errp); |
78368575 DB |
379 | } |
380 | ||
381 | static void block_crypto_close(BlockDriverState *bs) | |
382 | { | |
383 | BlockCrypto *crypto = bs->opaque; | |
384 | qcrypto_block_free(crypto->block); | |
385 | } | |
386 | ||
f87e08f9 DB |
387 | static int block_crypto_reopen_prepare(BDRVReopenState *state, |
388 | BlockReopenQueue *queue, Error **errp) | |
389 | { | |
390 | /* nothing needs checking */ | |
391 | return 0; | |
392 | } | |
78368575 | 393 | |
161253e2 DB |
394 | /* |
395 | * 1 MB bounce buffer gives good performance / memory tradeoff | |
396 | * when using cache=none|directsync. | |
397 | */ | |
398 | #define BLOCK_CRYPTO_MAX_IO_SIZE (1024 * 1024) | |
78368575 DB |
399 | |
400 | static coroutine_fn int | |
a73466fb DB |
401 | block_crypto_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, |
402 | QEMUIOVector *qiov, int flags) | |
78368575 DB |
403 | { |
404 | BlockCrypto *crypto = bs->opaque; | |
a73466fb | 405 | uint64_t cur_bytes; /* number of bytes in current iteration */ |
78368575 DB |
406 | uint64_t bytes_done = 0; |
407 | uint8_t *cipher_data = NULL; | |
408 | QEMUIOVector hd_qiov; | |
409 | int ret = 0; | |
a73466fb DB |
410 | uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block); |
411 | uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block); | |
a73466fb DB |
412 | |
413 | assert(!flags); | |
414 | assert(payload_offset < INT64_MAX); | |
415 | assert(QEMU_IS_ALIGNED(offset, sector_size)); | |
416 | assert(QEMU_IS_ALIGNED(bytes, sector_size)); | |
78368575 DB |
417 | |
418 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
419 | ||
161253e2 DB |
420 | /* Bounce buffer because we don't wish to expose cipher text |
421 | * in qiov which points to guest memory. | |
78368575 DB |
422 | */ |
423 | cipher_data = | |
161253e2 | 424 | qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_IO_SIZE, |
78368575 DB |
425 | qiov->size)); |
426 | if (cipher_data == NULL) { | |
427 | ret = -ENOMEM; | |
428 | goto cleanup; | |
429 | } | |
430 | ||
a73466fb DB |
431 | while (bytes) { |
432 | cur_bytes = MIN(bytes, BLOCK_CRYPTO_MAX_IO_SIZE); | |
78368575 DB |
433 | |
434 | qemu_iovec_reset(&hd_qiov); | |
a73466fb | 435 | qemu_iovec_add(&hd_qiov, cipher_data, cur_bytes); |
78368575 | 436 | |
a73466fb DB |
437 | ret = bdrv_co_preadv(bs->file, payload_offset + offset + bytes_done, |
438 | cur_bytes, &hd_qiov, 0); | |
78368575 DB |
439 | if (ret < 0) { |
440 | goto cleanup; | |
441 | } | |
442 | ||
4609742a DB |
443 | if (qcrypto_block_decrypt(crypto->block, offset + bytes_done, |
444 | cipher_data, cur_bytes, NULL) < 0) { | |
78368575 DB |
445 | ret = -EIO; |
446 | goto cleanup; | |
447 | } | |
448 | ||
a73466fb | 449 | qemu_iovec_from_buf(qiov, bytes_done, cipher_data, cur_bytes); |
78368575 | 450 | |
a73466fb DB |
451 | bytes -= cur_bytes; |
452 | bytes_done += cur_bytes; | |
78368575 DB |
453 | } |
454 | ||
455 | cleanup: | |
456 | qemu_iovec_destroy(&hd_qiov); | |
457 | qemu_vfree(cipher_data); | |
458 | ||
459 | return ret; | |
460 | } | |
461 | ||
462 | ||
463 | static coroutine_fn int | |
a73466fb DB |
464 | block_crypto_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, |
465 | QEMUIOVector *qiov, int flags) | |
78368575 DB |
466 | { |
467 | BlockCrypto *crypto = bs->opaque; | |
a73466fb | 468 | uint64_t cur_bytes; /* number of bytes in current iteration */ |
78368575 DB |
469 | uint64_t bytes_done = 0; |
470 | uint8_t *cipher_data = NULL; | |
471 | QEMUIOVector hd_qiov; | |
472 | int ret = 0; | |
a73466fb DB |
473 | uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block); |
474 | uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block); | |
a73466fb | 475 | |
d67a6b09 | 476 | assert(!(flags & ~BDRV_REQ_FUA)); |
a73466fb DB |
477 | assert(payload_offset < INT64_MAX); |
478 | assert(QEMU_IS_ALIGNED(offset, sector_size)); | |
479 | assert(QEMU_IS_ALIGNED(bytes, sector_size)); | |
78368575 DB |
480 | |
481 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
482 | ||
161253e2 DB |
483 | /* Bounce buffer because we're not permitted to touch |
484 | * contents of qiov - it points to guest memory. | |
78368575 DB |
485 | */ |
486 | cipher_data = | |
161253e2 | 487 | qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_IO_SIZE, |
78368575 DB |
488 | qiov->size)); |
489 | if (cipher_data == NULL) { | |
490 | ret = -ENOMEM; | |
491 | goto cleanup; | |
492 | } | |
493 | ||
a73466fb DB |
494 | while (bytes) { |
495 | cur_bytes = MIN(bytes, BLOCK_CRYPTO_MAX_IO_SIZE); | |
78368575 | 496 | |
a73466fb | 497 | qemu_iovec_to_buf(qiov, bytes_done, cipher_data, cur_bytes); |
78368575 | 498 | |
4609742a DB |
499 | if (qcrypto_block_encrypt(crypto->block, offset + bytes_done, |
500 | cipher_data, cur_bytes, NULL) < 0) { | |
78368575 DB |
501 | ret = -EIO; |
502 | goto cleanup; | |
503 | } | |
504 | ||
505 | qemu_iovec_reset(&hd_qiov); | |
a73466fb | 506 | qemu_iovec_add(&hd_qiov, cipher_data, cur_bytes); |
78368575 | 507 | |
a73466fb | 508 | ret = bdrv_co_pwritev(bs->file, payload_offset + offset + bytes_done, |
d67a6b09 | 509 | cur_bytes, &hd_qiov, flags); |
78368575 DB |
510 | if (ret < 0) { |
511 | goto cleanup; | |
512 | } | |
513 | ||
a73466fb DB |
514 | bytes -= cur_bytes; |
515 | bytes_done += cur_bytes; | |
78368575 DB |
516 | } |
517 | ||
518 | cleanup: | |
519 | qemu_iovec_destroy(&hd_qiov); | |
520 | qemu_vfree(cipher_data); | |
521 | ||
522 | return ret; | |
523 | } | |
524 | ||
a73466fb DB |
525 | static void block_crypto_refresh_limits(BlockDriverState *bs, Error **errp) |
526 | { | |
527 | BlockCrypto *crypto = bs->opaque; | |
528 | uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block); | |
529 | bs->bl.request_alignment = sector_size; /* No sub-sector I/O */ | |
530 | } | |
531 | ||
78368575 DB |
532 | |
533 | static int64_t block_crypto_getlength(BlockDriverState *bs) | |
534 | { | |
535 | BlockCrypto *crypto = bs->opaque; | |
536 | int64_t len = bdrv_getlength(bs->file->bs); | |
537 | ||
31376555 DB |
538 | uint64_t offset = qcrypto_block_get_payload_offset(crypto->block); |
539 | assert(offset < INT64_MAX); | |
540 | assert(offset < len); | |
78368575 DB |
541 | |
542 | len -= offset; | |
543 | ||
544 | return len; | |
545 | } | |
546 | ||
547 | ||
548 | static int block_crypto_probe_luks(const uint8_t *buf, | |
549 | int buf_size, | |
550 | const char *filename) { | |
551 | return block_crypto_probe_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS, | |
552 | buf, buf_size, filename); | |
553 | } | |
554 | ||
555 | static int block_crypto_open_luks(BlockDriverState *bs, | |
556 | QDict *options, | |
557 | int flags, | |
558 | Error **errp) | |
559 | { | |
560 | return block_crypto_open_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS, | |
561 | &block_crypto_runtime_opts_luks, | |
562 | bs, options, flags, errp); | |
563 | } | |
564 | ||
efc75e2a SH |
565 | static int coroutine_fn block_crypto_co_create_opts_luks(const char *filename, |
566 | QemuOpts *opts, | |
567 | Error **errp) | |
78368575 DB |
568 | { |
569 | return block_crypto_create_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS, | |
570 | filename, opts, errp); | |
571 | } | |
572 | ||
c7c4cf49 DB |
573 | static int block_crypto_get_info_luks(BlockDriverState *bs, |
574 | BlockDriverInfo *bdi) | |
575 | { | |
576 | BlockDriverInfo subbdi; | |
577 | int ret; | |
578 | ||
579 | ret = bdrv_get_info(bs->file->bs, &subbdi); | |
580 | if (ret != 0) { | |
581 | return ret; | |
582 | } | |
583 | ||
584 | bdi->unallocated_blocks_are_zero = false; | |
c7c4cf49 DB |
585 | bdi->cluster_size = subbdi.cluster_size; |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
590 | static ImageInfoSpecific * | |
591 | block_crypto_get_specific_info_luks(BlockDriverState *bs) | |
592 | { | |
593 | BlockCrypto *crypto = bs->opaque; | |
594 | ImageInfoSpecific *spec_info; | |
595 | QCryptoBlockInfo *info; | |
596 | ||
597 | info = qcrypto_block_get_info(crypto->block, NULL); | |
598 | if (!info) { | |
599 | return NULL; | |
600 | } | |
601 | if (info->format != Q_CRYPTO_BLOCK_FORMAT_LUKS) { | |
602 | qapi_free_QCryptoBlockInfo(info); | |
603 | return NULL; | |
604 | } | |
605 | ||
606 | spec_info = g_new(ImageInfoSpecific, 1); | |
607 | spec_info->type = IMAGE_INFO_SPECIFIC_KIND_LUKS; | |
608 | spec_info->u.luks.data = g_new(QCryptoBlockInfoLUKS, 1); | |
609 | *spec_info->u.luks.data = info->u.luks; | |
610 | ||
611 | /* Blank out pointers we've just stolen to avoid double free */ | |
612 | memset(&info->u.luks, 0, sizeof(info->u.luks)); | |
613 | ||
614 | qapi_free_QCryptoBlockInfo(info); | |
615 | ||
616 | return spec_info; | |
617 | } | |
618 | ||
78368575 DB |
619 | BlockDriver bdrv_crypto_luks = { |
620 | .format_name = "luks", | |
621 | .instance_size = sizeof(BlockCrypto), | |
622 | .bdrv_probe = block_crypto_probe_luks, | |
623 | .bdrv_open = block_crypto_open_luks, | |
624 | .bdrv_close = block_crypto_close, | |
862f215f | 625 | .bdrv_child_perm = bdrv_format_default_perms, |
efc75e2a | 626 | .bdrv_co_create_opts = block_crypto_co_create_opts_luks, |
78368575 DB |
627 | .bdrv_truncate = block_crypto_truncate, |
628 | .create_opts = &block_crypto_create_opts_luks, | |
629 | ||
f87e08f9 | 630 | .bdrv_reopen_prepare = block_crypto_reopen_prepare, |
a73466fb DB |
631 | .bdrv_refresh_limits = block_crypto_refresh_limits, |
632 | .bdrv_co_preadv = block_crypto_co_preadv, | |
633 | .bdrv_co_pwritev = block_crypto_co_pwritev, | |
78368575 | 634 | .bdrv_getlength = block_crypto_getlength, |
c7c4cf49 DB |
635 | .bdrv_get_info = block_crypto_get_info_luks, |
636 | .bdrv_get_specific_info = block_crypto_get_specific_info_luks, | |
78368575 DB |
637 | }; |
638 | ||
639 | static void block_crypto_init(void) | |
640 | { | |
641 | bdrv_register(&bdrv_crypto_luks); | |
642 | } | |
643 | ||
644 | block_init(block_crypto_init); |