AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 1 | /* |
| 2 | * DM request based crypto driver |
| 3 | * |
| 4 | * Copyright (c) 2014-2017, The Linux Foundation. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 and |
| 8 | * only version 2 as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/completion.h> |
| 17 | #include <linux/err.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/bio.h> |
| 22 | #include <linux/blkdev.h> |
| 23 | #include <linux/mempool.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/crypto.h> |
| 26 | #include <linux/qcrypto.h> |
| 27 | #include <linux/workqueue.h> |
| 28 | #include <linux/backing-dev.h> |
| 29 | #include <linux/atomic.h> |
| 30 | #include <linux/scatterlist.h> |
| 31 | #include <linux/device-mapper.h> |
| 32 | #include <linux/printk.h> |
| 33 | |
| 34 | #include <asm/page.h> |
| 35 | #include <asm/unaligned.h> |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 36 | #include <crypto/skcipher.h> |
| 37 | #include <crypto/internal/skcipher.h> |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 38 | #include <crypto/scatterwalk.h> |
| 39 | #include <crypto/hash.h> |
| 40 | #include <crypto/md5.h> |
| 41 | #include <crypto/algapi.h> |
| 42 | #include <crypto/ice.h> |
| 43 | |
| 44 | #define DM_MSG_PREFIX "req-crypt" |
| 45 | |
| 46 | #define MAX_SG_LIST 1024 |
| 47 | #define REQ_DM_512_KB (512*1024) |
| 48 | #define MAX_ENCRYPTION_BUFFERS 1 |
| 49 | #define MIN_IOS 256 |
| 50 | #define MIN_POOL_PAGES 32 |
| 51 | #define KEY_SIZE_XTS 32 |
| 52 | #define AES_XTS_IV_LEN 16 |
| 53 | #define MAX_MSM_ICE_KEY_LUT_SIZE 32 |
| 54 | #define SECTOR_SIZE 512 |
| 55 | #define MIN_CRYPTO_TRANSFER_SIZE (4 * 1024) |
| 56 | |
| 57 | #define DM_REQ_CRYPT_ERROR -1 |
| 58 | #define DM_REQ_CRYPT_ERROR_AFTER_PAGE_MALLOC -2 |
| 59 | |
| 60 | /* |
| 61 | * ENCRYPTION_MODE_CRYPTO means dm-req-crypt would invoke crypto operations |
| 62 | * for all of the requests. Crypto operations are performed by crypto engine |
| 63 | * plugged with Linux Kernel Crypto APIs |
| 64 | */ |
| 65 | #define DM_REQ_CRYPT_ENCRYPTION_MODE_CRYPTO 0 |
| 66 | /* |
| 67 | * ENCRYPTION_MODE_TRANSPARENT means dm-req-crypt would not invoke crypto |
| 68 | * operations for any of the requests. Data would be encrypted or decrypted |
| 69 | * using Inline Crypto Engine(ICE) embedded in storage hardware |
| 70 | */ |
| 71 | #define DM_REQ_CRYPT_ENCRYPTION_MODE_TRANSPARENT 1 |
| 72 | |
| 73 | #define DM_REQ_CRYPT_QUEUE_SIZE 256 |
| 74 | |
| 75 | struct req_crypt_result { |
| 76 | struct completion completion; |
| 77 | int err; |
| 78 | }; |
| 79 | |
| 80 | #define FDE_KEY_ID 0 |
| 81 | #define PFE_KEY_ID 1 |
| 82 | |
| 83 | static struct dm_dev *dev; |
| 84 | static struct kmem_cache *_req_crypt_io_pool; |
| 85 | static struct kmem_cache *_req_dm_scatterlist_pool; |
| 86 | static sector_t start_sector_orig; |
| 87 | static struct workqueue_struct *req_crypt_queue; |
| 88 | static struct workqueue_struct *req_crypt_split_io_queue; |
| 89 | static mempool_t *req_io_pool; |
| 90 | static mempool_t *req_page_pool; |
| 91 | static mempool_t *req_scatterlist_pool; |
| 92 | static bool is_fde_enabled; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 93 | static struct crypto_skcipher *tfm; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 94 | static unsigned int encryption_mode; |
| 95 | static struct ice_crypto_setting *ice_settings; |
| 96 | |
| 97 | unsigned int num_engines; |
| 98 | unsigned int num_engines_fde, fde_cursor; |
| 99 | unsigned int num_engines_pfe, pfe_cursor; |
| 100 | struct crypto_engine_entry *fde_eng, *pfe_eng; |
| 101 | DEFINE_MUTEX(engine_list_mutex); |
| 102 | |
| 103 | struct req_dm_crypt_io { |
| 104 | struct ice_crypto_setting ice_settings; |
| 105 | struct work_struct work; |
| 106 | struct request *cloned_request; |
| 107 | int error; |
| 108 | atomic_t pending; |
| 109 | struct timespec start_time; |
| 110 | bool should_encrypt; |
| 111 | bool should_decrypt; |
| 112 | u32 key_id; |
| 113 | }; |
| 114 | |
| 115 | struct req_dm_split_req_io { |
| 116 | struct work_struct work; |
| 117 | struct scatterlist *req_split_sg_read; |
| 118 | struct req_crypt_result result; |
| 119 | struct crypto_engine_entry *engine; |
| 120 | u8 IV[AES_XTS_IV_LEN]; |
| 121 | int size; |
| 122 | struct request *clone; |
| 123 | }; |
| 124 | |
| 125 | #ifdef CONFIG_FIPS_ENABLE |
| 126 | static struct qcrypto_func_set dm_qcrypto_func; |
| 127 | #else |
| 128 | static struct qcrypto_func_set dm_qcrypto_func = { |
| 129 | qcrypto_cipher_set_device_hw, |
| 130 | qcrypto_cipher_set_flag, |
| 131 | qcrypto_get_num_engines, |
| 132 | qcrypto_get_engine_list |
| 133 | }; |
| 134 | #endif |
| 135 | static void req_crypt_cipher_complete |
| 136 | (struct crypto_async_request *req, int err); |
| 137 | static void req_cryptd_split_req_queue_cb |
| 138 | (struct work_struct *work); |
| 139 | static void req_cryptd_split_req_queue |
| 140 | (struct req_dm_split_req_io *io); |
| 141 | static void req_crypt_split_io_complete |
| 142 | (struct req_crypt_result *res, int err); |
| 143 | |
| 144 | static bool req_crypt_should_encrypt(struct req_dm_crypt_io *req) |
| 145 | { |
| 146 | int ret = 0; |
| 147 | bool should_encrypt = false; |
| 148 | struct bio *bio = NULL; |
| 149 | bool is_encrypted = false; |
| 150 | bool is_inplace = false; |
| 151 | |
| 152 | if (!req || !req->cloned_request || !req->cloned_request->bio) |
| 153 | return false; |
| 154 | |
| 155 | if (encryption_mode == DM_REQ_CRYPT_ENCRYPTION_MODE_TRANSPARENT) |
| 156 | return false; |
| 157 | bio = req->cloned_request->bio; |
| 158 | |
| 159 | /* req->key_id = key_id; @todo support more than 1 pfe key */ |
| 160 | if ((ret == 0) && (is_encrypted || is_inplace)) { |
| 161 | should_encrypt = true; |
| 162 | req->key_id = PFE_KEY_ID; |
| 163 | } else if (is_fde_enabled) { |
| 164 | should_encrypt = true; |
| 165 | req->key_id = FDE_KEY_ID; |
| 166 | } |
| 167 | |
| 168 | return should_encrypt; |
| 169 | } |
| 170 | |
| 171 | static bool req_crypt_should_deccrypt(struct req_dm_crypt_io *req) |
| 172 | { |
| 173 | int ret = 0; |
| 174 | bool should_deccrypt = false; |
| 175 | struct bio *bio = NULL; |
| 176 | bool is_encrypted = false; |
| 177 | bool is_inplace = false; |
| 178 | |
| 179 | if (!req || !req->cloned_request || !req->cloned_request->bio) |
| 180 | return false; |
| 181 | if (encryption_mode == DM_REQ_CRYPT_ENCRYPTION_MODE_TRANSPARENT) |
| 182 | return false; |
| 183 | |
| 184 | bio = req->cloned_request->bio; |
| 185 | |
| 186 | /* req->key_id = key_id; @todo support more than 1 pfe key */ |
| 187 | if ((ret == 0) && (is_encrypted && !is_inplace)) { |
| 188 | should_deccrypt = true; |
| 189 | req->key_id = PFE_KEY_ID; |
| 190 | } else if (is_fde_enabled) { |
| 191 | should_deccrypt = true; |
| 192 | req->key_id = FDE_KEY_ID; |
| 193 | } |
| 194 | |
| 195 | return should_deccrypt; |
| 196 | } |
| 197 | |
| 198 | static void req_crypt_inc_pending(struct req_dm_crypt_io *io) |
| 199 | { |
| 200 | atomic_inc(&io->pending); |
| 201 | } |
| 202 | |
| 203 | static void req_crypt_dec_pending_encrypt(struct req_dm_crypt_io *io) |
| 204 | { |
| 205 | int error = 0; |
| 206 | struct request *clone = NULL; |
| 207 | |
| 208 | if (io) { |
| 209 | error = io->error; |
| 210 | if (io->cloned_request) { |
| 211 | clone = io->cloned_request; |
| 212 | } else { |
| 213 | DMERR("%s io->cloned_request is NULL\n", |
| 214 | __func__); |
| 215 | /* |
| 216 | * If Clone is NULL we cannot do anything, |
| 217 | * this should never happen |
| 218 | */ |
| 219 | WARN_ON(1); |
| 220 | } |
| 221 | } else { |
| 222 | DMERR("%s io is NULL\n", __func__); |
| 223 | /* |
| 224 | * If Clone is NULL we cannot do anything, |
| 225 | * this should never happen |
| 226 | */ |
| 227 | WARN_ON(1); |
| 228 | } |
| 229 | |
| 230 | atomic_dec(&io->pending); |
| 231 | |
| 232 | if (error < 0) { |
| 233 | dm_kill_unmapped_request(clone, error); |
| 234 | mempool_free(io, req_io_pool); |
| 235 | } else |
| 236 | dm_dispatch_request(clone); |
| 237 | } |
| 238 | |
| 239 | static void req_crypt_dec_pending_decrypt(struct req_dm_crypt_io *io) |
| 240 | { |
| 241 | int error = 0; |
| 242 | struct request *clone = NULL; |
| 243 | |
| 244 | if (io) { |
| 245 | error = io->error; |
| 246 | if (io->cloned_request) { |
| 247 | clone = io->cloned_request; |
| 248 | } else { |
| 249 | DMERR("%s io->cloned_request is NULL\n", |
| 250 | __func__); |
| 251 | /* |
| 252 | * If Clone is NULL we cannot do anything, |
| 253 | * this should never happen |
| 254 | */ |
| 255 | WARN_ON(1); |
| 256 | } |
| 257 | } else { |
| 258 | DMERR("%s io is NULL\n", |
| 259 | __func__); |
| 260 | /* |
| 261 | * If Clone is NULL we cannot do anything, |
| 262 | * this should never happen |
| 263 | */ |
| 264 | WARN_ON(1); |
| 265 | } |
| 266 | |
| 267 | /* Should never get here if io or Clone is NULL */ |
| 268 | dm_end_request(clone, error); |
| 269 | atomic_dec(&io->pending); |
| 270 | mempool_free(io, req_io_pool); |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * The callback that will be called by the worker queue to perform Decryption |
| 275 | * for reads and use the dm function to complete the bios and requests. |
| 276 | */ |
| 277 | static void req_cryptd_crypt_read_convert(struct req_dm_crypt_io *io) |
| 278 | { |
| 279 | struct request *clone = NULL; |
| 280 | int error = DM_REQ_CRYPT_ERROR; |
| 281 | int total_sg_len = 0, total_bytes_in_req = 0, temp_size = 0, i = 0; |
| 282 | struct scatterlist *sg = NULL; |
| 283 | struct scatterlist *req_sg_read = NULL; |
| 284 | |
| 285 | unsigned int engine_list_total = 0; |
| 286 | struct crypto_engine_entry *curr_engine_list = NULL; |
| 287 | bool split_transfers = 0; |
| 288 | sector_t tempiv; |
| 289 | struct req_dm_split_req_io *split_io = NULL; |
| 290 | |
| 291 | if (io) { |
| 292 | error = io->error; |
| 293 | if (io->cloned_request) { |
| 294 | clone = io->cloned_request; |
| 295 | } else { |
| 296 | DMERR("%s io->cloned_request is NULL\n", |
| 297 | __func__); |
| 298 | error = DM_REQ_CRYPT_ERROR; |
| 299 | goto submit_request; |
| 300 | } |
| 301 | } else { |
| 302 | DMERR("%s io is NULL\n", |
| 303 | __func__); |
| 304 | error = DM_REQ_CRYPT_ERROR; |
| 305 | goto submit_request; |
| 306 | } |
| 307 | |
| 308 | req_crypt_inc_pending(io); |
| 309 | |
| 310 | mutex_lock(&engine_list_mutex); |
| 311 | |
| 312 | engine_list_total = (io->key_id == FDE_KEY_ID ? num_engines_fde : |
| 313 | (io->key_id == PFE_KEY_ID ? |
| 314 | num_engines_pfe : 0)); |
| 315 | |
| 316 | curr_engine_list = (io->key_id == FDE_KEY_ID ? fde_eng : |
| 317 | (io->key_id == PFE_KEY_ID ? |
| 318 | pfe_eng : NULL)); |
| 319 | |
| 320 | mutex_unlock(&engine_list_mutex); |
| 321 | |
| 322 | req_sg_read = (struct scatterlist *)mempool_alloc(req_scatterlist_pool, |
| 323 | GFP_KERNEL); |
| 324 | if (!req_sg_read) { |
| 325 | DMERR("%s req_sg_read allocation failed\n", |
| 326 | __func__); |
| 327 | error = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 328 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 329 | } |
| 330 | memset(req_sg_read, 0, sizeof(struct scatterlist) * MAX_SG_LIST); |
| 331 | |
| 332 | total_sg_len = blk_rq_map_sg_no_cluster(clone->q, clone, req_sg_read); |
| 333 | if ((total_sg_len <= 0) || (total_sg_len > MAX_SG_LIST)) { |
| 334 | DMERR("%s Request Error%d", __func__, total_sg_len); |
| 335 | error = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 336 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 337 | } |
| 338 | |
| 339 | total_bytes_in_req = clone->__data_len; |
| 340 | if (total_bytes_in_req > REQ_DM_512_KB) { |
| 341 | DMERR("%s total_bytes_in_req > 512 MB %d", |
| 342 | __func__, total_bytes_in_req); |
| 343 | error = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 344 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | |
| 348 | if ((clone->__data_len >= (MIN_CRYPTO_TRANSFER_SIZE * |
| 349 | engine_list_total)) |
| 350 | && (engine_list_total > 1)) |
| 351 | split_transfers = 1; |
| 352 | |
| 353 | if (split_transfers) { |
| 354 | split_io = kzalloc(sizeof(struct req_dm_split_req_io) |
| 355 | * engine_list_total, GFP_KERNEL); |
| 356 | if (!split_io) { |
| 357 | DMERR("%s split_io allocation failed\n", __func__); |
| 358 | error = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 359 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 360 | } |
| 361 | |
| 362 | split_io[0].req_split_sg_read = sg = req_sg_read; |
| 363 | split_io[engine_list_total - 1].size = total_bytes_in_req; |
| 364 | for (i = 0; i < (engine_list_total); i++) { |
| 365 | while ((sg) && i < (engine_list_total - 1)) { |
| 366 | split_io[i].size += sg->length; |
| 367 | split_io[engine_list_total - 1].size -= |
| 368 | sg->length; |
| 369 | if (split_io[i].size >= |
| 370 | (total_bytes_in_req / |
| 371 | engine_list_total)) { |
| 372 | split_io[i + 1].req_split_sg_read = |
| 373 | sg_next(sg); |
| 374 | sg_mark_end(sg); |
| 375 | break; |
| 376 | } |
| 377 | sg = sg_next(sg); |
| 378 | } |
| 379 | split_io[i].engine = &curr_engine_list[i]; |
| 380 | init_completion(&split_io[i].result.completion); |
| 381 | memset(&split_io[i].IV, 0, AES_XTS_IV_LEN); |
| 382 | tempiv = clone->__sector + (temp_size / SECTOR_SIZE); |
| 383 | memcpy(&split_io[i].IV, &tempiv, sizeof(sector_t)); |
| 384 | temp_size += split_io[i].size; |
| 385 | split_io[i].clone = clone; |
| 386 | req_cryptd_split_req_queue(&split_io[i]); |
| 387 | } |
| 388 | } else { |
| 389 | split_io = kzalloc(sizeof(struct req_dm_split_req_io), |
| 390 | GFP_KERNEL); |
| 391 | if (!split_io) { |
| 392 | DMERR("%s split_io allocation failed\n", __func__); |
| 393 | error = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 394 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 395 | } |
| 396 | split_io->engine = &curr_engine_list[0]; |
| 397 | init_completion(&split_io->result.completion); |
| 398 | memcpy(split_io->IV, &clone->__sector, sizeof(sector_t)); |
| 399 | split_io->req_split_sg_read = req_sg_read; |
| 400 | split_io->size = total_bytes_in_req; |
| 401 | split_io->clone = clone; |
| 402 | req_cryptd_split_req_queue(split_io); |
| 403 | } |
| 404 | |
| 405 | if (!split_transfers) { |
| 406 | wait_for_completion_interruptible(&split_io->result.completion); |
| 407 | if (split_io->result.err) { |
| 408 | DMERR("%s error = %d for request\n", |
| 409 | __func__, split_io->result.err); |
| 410 | error = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 411 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 412 | } |
| 413 | } else { |
| 414 | for (i = 0; i < (engine_list_total); i++) { |
| 415 | wait_for_completion_interruptible( |
| 416 | &split_io[i].result.completion); |
| 417 | if (split_io[i].result.err) { |
| 418 | DMERR("%s error = %d for %dst request\n", |
| 419 | __func__, split_io[i].result.err, i); |
| 420 | error = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 421 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 422 | } |
| 423 | } |
| 424 | } |
| 425 | error = 0; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 426 | skcipher_req_alloc_failure: |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 427 | |
| 428 | mempool_free(req_sg_read, req_scatterlist_pool); |
| 429 | kfree(split_io); |
| 430 | submit_request: |
| 431 | if (io) |
| 432 | io->error = error; |
| 433 | req_crypt_dec_pending_decrypt(io); |
| 434 | } |
| 435 | |
| 436 | /* |
| 437 | * This callback is called by the worker queue to perform non-decrypt reads |
| 438 | * and use the dm function to complete the bios and requests. |
| 439 | */ |
| 440 | static void req_cryptd_crypt_read_plain(struct req_dm_crypt_io *io) |
| 441 | { |
| 442 | struct request *clone = NULL; |
| 443 | int error = 0; |
| 444 | |
| 445 | if (!io || !io->cloned_request) { |
| 446 | DMERR("%s io is invalid\n", __func__); |
| 447 | WARN_ON(1); /* should not happen */ |
| 448 | } |
| 449 | |
| 450 | clone = io->cloned_request; |
| 451 | |
| 452 | dm_end_request(clone, error); |
| 453 | mempool_free(io, req_io_pool); |
| 454 | } |
| 455 | |
| 456 | /* |
| 457 | * The callback that will be called by the worker queue to perform Encryption |
| 458 | * for writes and submit the request using the elevelator. |
| 459 | */ |
| 460 | static void req_cryptd_crypt_write_convert(struct req_dm_crypt_io *io) |
| 461 | { |
| 462 | struct request *clone = NULL; |
| 463 | struct bio *bio_src = NULL; |
| 464 | unsigned int total_sg_len_req_in = 0, total_sg_len_req_out = 0, |
| 465 | total_bytes_in_req = 0, error = DM_MAPIO_REMAPPED, rc = 0; |
| 466 | struct req_iterator iter; |
| 467 | struct req_iterator iter1; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 468 | struct skcipher_request *req = NULL; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 469 | struct req_crypt_result result; |
| 470 | struct bio_vec bvec; |
| 471 | struct scatterlist *req_sg_in = NULL; |
| 472 | struct scatterlist *req_sg_out = NULL; |
| 473 | int copy_bio_sector_to_req = 0; |
| 474 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
| 475 | struct page *page = NULL; |
| 476 | u8 IV[AES_XTS_IV_LEN]; |
| 477 | int remaining_size = 0, err = 0; |
| 478 | struct crypto_engine_entry engine; |
| 479 | unsigned int engine_list_total = 0; |
| 480 | struct crypto_engine_entry *curr_engine_list = NULL; |
| 481 | unsigned int *engine_cursor = NULL; |
| 482 | |
| 483 | |
| 484 | if (io) { |
| 485 | if (io->cloned_request) { |
| 486 | clone = io->cloned_request; |
| 487 | } else { |
| 488 | DMERR("%s io->cloned_request is NULL\n", |
| 489 | __func__); |
| 490 | error = DM_REQ_CRYPT_ERROR; |
| 491 | goto submit_request; |
| 492 | } |
| 493 | } else { |
| 494 | DMERR("%s io is NULL\n", |
| 495 | __func__); |
| 496 | error = DM_REQ_CRYPT_ERROR; |
| 497 | goto submit_request; |
| 498 | } |
| 499 | |
| 500 | req_crypt_inc_pending(io); |
| 501 | |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 502 | req = skcipher_request_alloc(tfm, GFP_KERNEL); |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 503 | if (!req) { |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 504 | DMERR("%s skcipher request allocation failed\n", |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 505 | __func__); |
| 506 | error = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 507 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 508 | } |
| 509 | |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 510 | skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 511 | req_crypt_cipher_complete, &result); |
| 512 | |
| 513 | mutex_lock(&engine_list_mutex); |
| 514 | engine_list_total = (io->key_id == FDE_KEY_ID ? num_engines_fde : |
| 515 | (io->key_id == PFE_KEY_ID ? |
| 516 | num_engines_pfe : 0)); |
| 517 | |
| 518 | curr_engine_list = (io->key_id == FDE_KEY_ID ? fde_eng : |
| 519 | (io->key_id == PFE_KEY_ID ? |
| 520 | pfe_eng : NULL)); |
| 521 | |
| 522 | engine_cursor = (io->key_id == FDE_KEY_ID ? &fde_cursor : |
| 523 | (io->key_id == PFE_KEY_ID ? &pfe_cursor |
| 524 | : NULL)); |
| 525 | if ((engine_list_total < 1) || (curr_engine_list == NULL) || |
| 526 | (engine_cursor == NULL)) { |
| 527 | DMERR("%s Unknown Key ID!\n", __func__); |
| 528 | error = DM_REQ_CRYPT_ERROR; |
| 529 | mutex_unlock(&engine_list_mutex); |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 530 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 531 | } |
| 532 | |
| 533 | engine = curr_engine_list[*engine_cursor]; |
| 534 | (*engine_cursor)++; |
| 535 | (*engine_cursor) %= engine_list_total; |
| 536 | |
| 537 | err = (dm_qcrypto_func.cipher_set)(req, engine.ce_device, |
| 538 | engine.hw_instance); |
| 539 | if (err) { |
| 540 | DMERR("%s qcrypto_cipher_set_device_hw failed with err %d\n", |
| 541 | __func__, err); |
| 542 | mutex_unlock(&engine_list_mutex); |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 543 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 544 | } |
| 545 | mutex_unlock(&engine_list_mutex); |
| 546 | |
| 547 | init_completion(&result.completion); |
| 548 | |
| 549 | (dm_qcrypto_func.cipher_flag)(req, |
| 550 | QCRYPTO_CTX_USE_PIPE_KEY | QCRYPTO_CTX_XTS_DU_SIZE_512B); |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 551 | crypto_skcipher_clear_flags(tfm, ~0); |
| 552 | crypto_skcipher_setkey(tfm, NULL, KEY_SIZE_XTS); |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 553 | |
| 554 | req_sg_in = (struct scatterlist *)mempool_alloc(req_scatterlist_pool, |
| 555 | GFP_KERNEL); |
| 556 | if (!req_sg_in) { |
| 557 | DMERR("%s req_sg_in allocation failed\n", |
| 558 | __func__); |
| 559 | error = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 560 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 561 | } |
| 562 | memset(req_sg_in, 0, sizeof(struct scatterlist) * MAX_SG_LIST); |
| 563 | |
| 564 | req_sg_out = (struct scatterlist *)mempool_alloc(req_scatterlist_pool, |
| 565 | GFP_KERNEL); |
| 566 | if (!req_sg_out) { |
| 567 | DMERR("%s req_sg_out allocation failed\n", |
| 568 | __func__); |
| 569 | error = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 570 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 571 | } |
| 572 | memset(req_sg_out, 0, sizeof(struct scatterlist) * MAX_SG_LIST); |
| 573 | |
| 574 | total_sg_len_req_in = blk_rq_map_sg(clone->q, clone, req_sg_in); |
| 575 | if ((total_sg_len_req_in <= 0) || |
| 576 | (total_sg_len_req_in > MAX_SG_LIST)) { |
| 577 | DMERR("%s Request Error%d", __func__, total_sg_len_req_in); |
| 578 | error = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 579 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | total_bytes_in_req = clone->__data_len; |
| 583 | if (total_bytes_in_req > REQ_DM_512_KB) { |
| 584 | DMERR("%s total_bytes_in_req > 512 MB %d", |
| 585 | __func__, total_bytes_in_req); |
| 586 | error = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 587 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | rq_for_each_segment(bvec, clone, iter) { |
| 591 | if (bvec.bv_len > remaining_size) { |
| 592 | page = NULL; |
| 593 | while (page == NULL) { |
| 594 | page = mempool_alloc(req_page_pool, gfp_mask); |
| 595 | if (!page) { |
| 596 | DMERR("%s Crypt page alloc failed", |
| 597 | __func__); |
| 598 | congestion_wait(BLK_RW_ASYNC, HZ/100); |
| 599 | } |
| 600 | } |
| 601 | |
| 602 | bvec.bv_page = page; |
| 603 | bvec.bv_offset = 0; |
| 604 | remaining_size = PAGE_SIZE - bvec.bv_len; |
| 605 | if (remaining_size < 0) |
| 606 | WARN_ON(1); |
| 607 | } else { |
| 608 | bvec.bv_page = page; |
| 609 | bvec.bv_offset = PAGE_SIZE - remaining_size; |
| 610 | remaining_size = remaining_size - bvec.bv_len; |
| 611 | } |
| 612 | } |
| 613 | |
| 614 | total_sg_len_req_out = blk_rq_map_sg(clone->q, clone, req_sg_out); |
| 615 | if ((total_sg_len_req_out <= 0) || |
| 616 | (total_sg_len_req_out > MAX_SG_LIST)) { |
| 617 | DMERR("%s Request Error %d", __func__, total_sg_len_req_out); |
| 618 | error = DM_REQ_CRYPT_ERROR_AFTER_PAGE_MALLOC; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 619 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 620 | } |
| 621 | |
| 622 | memset(IV, 0, AES_XTS_IV_LEN); |
| 623 | memcpy(IV, &clone->__sector, sizeof(sector_t)); |
| 624 | |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 625 | skcipher_request_set_crypt(req, req_sg_in, req_sg_out, |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 626 | total_bytes_in_req, (void *) IV); |
| 627 | |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 628 | rc = crypto_skcipher_encrypt(req); |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 629 | |
| 630 | switch (rc) { |
| 631 | case 0: |
| 632 | break; |
| 633 | |
| 634 | case -EBUSY: |
| 635 | /* |
| 636 | * Lets make this synchronous request by waiting on |
| 637 | * in progress as well |
| 638 | */ |
| 639 | case -EINPROGRESS: |
| 640 | wait_for_completion_interruptible(&result.completion); |
| 641 | if (result.err) { |
| 642 | DMERR("%s error = %d encrypting the request\n", |
| 643 | __func__, result.err); |
| 644 | error = DM_REQ_CRYPT_ERROR_AFTER_PAGE_MALLOC; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 645 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 646 | } |
| 647 | break; |
| 648 | |
| 649 | default: |
| 650 | error = DM_REQ_CRYPT_ERROR_AFTER_PAGE_MALLOC; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 651 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 652 | } |
| 653 | |
| 654 | __rq_for_each_bio(bio_src, clone) { |
| 655 | if (copy_bio_sector_to_req == 0) |
| 656 | copy_bio_sector_to_req++; |
| 657 | blk_queue_bounce(clone->q, &bio_src); |
| 658 | } |
| 659 | |
| 660 | /* |
| 661 | * Recalculate the phy_segments as we allocate new pages |
| 662 | * This is used by storage driver to fill the sg list. |
| 663 | */ |
| 664 | blk_recalc_rq_segments(clone); |
| 665 | |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 666 | skcipher_req_alloc_failure: |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 667 | if (req) |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 668 | skcipher_request_free(req); |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 669 | |
| 670 | if (error == DM_REQ_CRYPT_ERROR_AFTER_PAGE_MALLOC) { |
| 671 | rq_for_each_segment(bvec, clone, iter1) { |
| 672 | if (bvec.bv_offset == 0) { |
| 673 | mempool_free(bvec.bv_page, req_page_pool); |
| 674 | bvec.bv_page = NULL; |
| 675 | } else |
| 676 | bvec.bv_page = NULL; |
| 677 | } |
| 678 | } |
| 679 | |
| 680 | mempool_free(req_sg_in, req_scatterlist_pool); |
| 681 | mempool_free(req_sg_out, req_scatterlist_pool); |
| 682 | submit_request: |
| 683 | if (io) |
| 684 | io->error = error; |
| 685 | req_crypt_dec_pending_encrypt(io); |
| 686 | } |
| 687 | |
| 688 | /* |
| 689 | * This callback is called by the worker queue to perform non-encrypted writes |
| 690 | * and submit the request using the elevelator. |
| 691 | */ |
| 692 | static void req_cryptd_crypt_write_plain(struct req_dm_crypt_io *io) |
| 693 | { |
| 694 | struct request *clone = NULL; |
| 695 | |
| 696 | if (!io || !io->cloned_request) { |
| 697 | DMERR("%s io is invalid\n", __func__); |
| 698 | WARN_ON(1); /* should not happen */ |
| 699 | } |
| 700 | |
| 701 | clone = io->cloned_request; |
| 702 | io->error = 0; |
| 703 | dm_dispatch_request(clone); |
| 704 | } |
| 705 | |
| 706 | /* Queue callback function that will get triggered */ |
| 707 | static void req_cryptd_crypt(struct work_struct *work) |
| 708 | { |
| 709 | struct req_dm_crypt_io *io = |
| 710 | container_of(work, struct req_dm_crypt_io, work); |
| 711 | |
| 712 | if (rq_data_dir(io->cloned_request) == WRITE) { |
| 713 | if (io->should_encrypt) |
| 714 | req_cryptd_crypt_write_convert(io); |
| 715 | else |
| 716 | req_cryptd_crypt_write_plain(io); |
| 717 | } else if (rq_data_dir(io->cloned_request) == READ) { |
| 718 | if (io->should_decrypt) |
| 719 | req_cryptd_crypt_read_convert(io); |
| 720 | else |
| 721 | req_cryptd_crypt_read_plain(io); |
| 722 | } else { |
| 723 | DMERR("%s received non-write request for Clone 0x%p\n", |
| 724 | __func__, io->cloned_request); |
| 725 | } |
| 726 | } |
| 727 | |
| 728 | static void req_cryptd_split_req_queue_cb(struct work_struct *work) |
| 729 | { |
| 730 | struct req_dm_split_req_io *io = |
| 731 | container_of(work, struct req_dm_split_req_io, work); |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 732 | struct skcipher_request *req = NULL; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 733 | struct req_crypt_result result; |
| 734 | int err = 0; |
| 735 | struct crypto_engine_entry *engine = NULL; |
| 736 | |
| 737 | if ((!io) || (!io->req_split_sg_read) || (!io->engine)) { |
| 738 | DMERR("%s Input invalid\n", |
| 739 | __func__); |
| 740 | err = DM_REQ_CRYPT_ERROR; |
| 741 | /* If io is not populated this should not be called */ |
| 742 | WARN_ON(1); |
| 743 | } |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 744 | req = skcipher_request_alloc(tfm, GFP_KERNEL); |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 745 | if (!req) { |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 746 | DMERR("%s skcipher request allocation failed\n", __func__); |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 747 | err = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 748 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 749 | } |
| 750 | |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 751 | skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 752 | req_crypt_cipher_complete, &result); |
| 753 | |
| 754 | engine = io->engine; |
| 755 | |
| 756 | err = (dm_qcrypto_func.cipher_set)(req, engine->ce_device, |
| 757 | engine->hw_instance); |
| 758 | if (err) { |
| 759 | DMERR("%s qcrypto_cipher_set_device_hw failed with err %d\n", |
| 760 | __func__, err); |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 761 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 762 | } |
| 763 | init_completion(&result.completion); |
| 764 | (dm_qcrypto_func.cipher_flag)(req, |
| 765 | QCRYPTO_CTX_USE_PIPE_KEY | QCRYPTO_CTX_XTS_DU_SIZE_512B); |
| 766 | |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 767 | crypto_skcipher_clear_flags(tfm, ~0); |
| 768 | crypto_skcipher_setkey(tfm, NULL, KEY_SIZE_XTS); |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 769 | |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 770 | skcipher_request_set_crypt(req, io->req_split_sg_read, |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 771 | io->req_split_sg_read, io->size, (void *) io->IV); |
| 772 | |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 773 | err = crypto_skcipher_decrypt(req); |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 774 | switch (err) { |
| 775 | case 0: |
| 776 | break; |
| 777 | |
| 778 | case -EBUSY: |
| 779 | /* |
| 780 | * Lets make this synchronous request by waiting on |
| 781 | * in progress as well |
| 782 | */ |
| 783 | case -EINPROGRESS: |
| 784 | wait_for_completion_io(&result.completion); |
| 785 | if (result.err) { |
| 786 | DMERR("%s error = %d encrypting the request\n", |
| 787 | __func__, result.err); |
| 788 | err = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 789 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 790 | } |
| 791 | break; |
| 792 | |
| 793 | default: |
| 794 | err = DM_REQ_CRYPT_ERROR; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 795 | goto skcipher_req_alloc_failure; |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 796 | } |
| 797 | err = 0; |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 798 | skcipher_req_alloc_failure: |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 799 | if (req) |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 800 | skcipher_request_free(req); |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 801 | |
| 802 | req_crypt_split_io_complete(&io->result, err); |
| 803 | } |
| 804 | |
| 805 | static void req_cryptd_split_req_queue(struct req_dm_split_req_io *io) |
| 806 | { |
| 807 | INIT_WORK(&io->work, req_cryptd_split_req_queue_cb); |
| 808 | queue_work(req_crypt_split_io_queue, &io->work); |
| 809 | } |
| 810 | |
| 811 | static void req_cryptd_queue_crypt(struct req_dm_crypt_io *io) |
| 812 | { |
| 813 | INIT_WORK(&io->work, req_cryptd_crypt); |
| 814 | queue_work(req_crypt_queue, &io->work); |
| 815 | } |
| 816 | |
| 817 | /* |
| 818 | * Cipher complete callback, this is triggered by the Linux crypto api once |
| 819 | * the operation is done. This signals the waiting thread that the crypto |
| 820 | * operation is complete. |
| 821 | */ |
| 822 | static void req_crypt_cipher_complete(struct crypto_async_request *req, int err) |
| 823 | { |
| 824 | struct req_crypt_result *res = req->data; |
| 825 | |
| 826 | if (err == -EINPROGRESS) |
| 827 | return; |
| 828 | |
| 829 | res->err = err; |
| 830 | complete(&res->completion); |
| 831 | } |
| 832 | |
| 833 | static void req_crypt_split_io_complete(struct req_crypt_result *res, int err) |
| 834 | { |
| 835 | if (err == -EINPROGRESS) |
| 836 | return; |
| 837 | |
| 838 | res->err = err; |
| 839 | complete(&res->completion); |
| 840 | } |
| 841 | /* |
| 842 | * If bio->bi_dev is a partition, remap the location |
| 843 | */ |
| 844 | static inline void req_crypt_blk_partition_remap(struct bio *bio) |
| 845 | { |
| 846 | struct block_device *bdev = bio->bi_bdev; |
| 847 | |
| 848 | if (bio_sectors(bio) && bdev != bdev->bd_contains) { |
| 849 | struct hd_struct *p = bdev->bd_part; |
| 850 | /* |
| 851 | * Check for integer overflow, should never happen. |
| 852 | */ |
| 853 | if (p->start_sect > (UINT_MAX - bio->bi_iter.bi_sector)) |
| 854 | WARN_ON(1); |
| 855 | |
| 856 | bio->bi_iter.bi_sector += p->start_sect; |
| 857 | bio->bi_bdev = bdev->bd_contains; |
| 858 | } |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * The endio function is called from ksoftirqd context (atomic). |
| 863 | * For write operations the new pages created form the mempool |
| 864 | * is freed and returned. * For read operations, decryption is |
| 865 | * required, since this is called in a atomic * context, the |
| 866 | * request is sent to a worker queue to complete decryptiona and |
| 867 | * free the request once done. |
| 868 | */ |
| 869 | static int req_crypt_endio(struct dm_target *ti, struct request *clone, |
| 870 | int error, union map_info *map_context) |
| 871 | { |
| 872 | int err = 0; |
| 873 | struct req_iterator iter1; |
| 874 | struct bio_vec bvec; |
| 875 | struct req_dm_crypt_io *req_io = map_context->ptr; |
| 876 | |
| 877 | /* If it is for ICE, free up req_io and return */ |
| 878 | if (encryption_mode == DM_REQ_CRYPT_ENCRYPTION_MODE_TRANSPARENT) { |
| 879 | mempool_free(req_io, req_io_pool); |
| 880 | err = error; |
| 881 | goto submit_request; |
| 882 | } |
| 883 | |
| 884 | if (rq_data_dir(clone) == WRITE) { |
| 885 | rq_for_each_segment(bvec, clone, iter1) { |
| 886 | if (req_io->should_encrypt && bvec.bv_offset == 0) { |
| 887 | mempool_free(bvec.bv_page, req_page_pool); |
| 888 | bvec.bv_page = NULL; |
| 889 | } else |
| 890 | bvec.bv_page = NULL; |
| 891 | } |
| 892 | mempool_free(req_io, req_io_pool); |
| 893 | goto submit_request; |
| 894 | } else if (rq_data_dir(clone) == READ) { |
| 895 | req_io->error = error; |
| 896 | req_cryptd_queue_crypt(req_io); |
| 897 | err = DM_ENDIO_INCOMPLETE; |
| 898 | goto submit_request; |
| 899 | } |
| 900 | |
| 901 | submit_request: |
| 902 | return err; |
| 903 | } |
| 904 | |
| 905 | /* |
| 906 | * This function is called with interrupts disabled |
| 907 | * The function remaps the clone for the underlying device. |
| 908 | * If it is a write request, it calls into the worker queue to |
| 909 | * encrypt the data |
| 910 | * and submit the request directly using the elevator |
| 911 | * For a read request no pre-processing is required the request |
| 912 | * is returned to dm once mapping is done |
| 913 | */ |
| 914 | static int req_crypt_map(struct dm_target *ti, struct request *clone, |
| 915 | union map_info *map_context) |
| 916 | { |
| 917 | struct req_dm_crypt_io *req_io = NULL; |
| 918 | int error = DM_REQ_CRYPT_ERROR, copy_bio_sector_to_req = 0; |
| 919 | struct bio *bio_src = NULL; |
| 920 | gfp_t gfp_flag = GFP_KERNEL; |
| 921 | |
| 922 | if (in_interrupt() || irqs_disabled()) |
| 923 | gfp_flag = GFP_NOWAIT; |
| 924 | |
| 925 | req_io = mempool_alloc(req_io_pool, gfp_flag); |
| 926 | if (!req_io) { |
| 927 | WARN_ON(1); |
| 928 | error = DM_REQ_CRYPT_ERROR; |
| 929 | goto submit_request; |
| 930 | } |
| 931 | |
| 932 | /* Save the clone in the req_io, the callback to the worker |
| 933 | * queue will get the req_io |
| 934 | */ |
| 935 | req_io->cloned_request = clone; |
| 936 | map_context->ptr = req_io; |
| 937 | atomic_set(&req_io->pending, 0); |
| 938 | |
| 939 | if (rq_data_dir(clone) == WRITE) |
| 940 | req_io->should_encrypt = req_crypt_should_encrypt(req_io); |
| 941 | if (rq_data_dir(clone) == READ) |
| 942 | req_io->should_decrypt = req_crypt_should_deccrypt(req_io); |
| 943 | |
| 944 | /* Get the queue of the underlying original device */ |
| 945 | clone->q = bdev_get_queue(dev->bdev); |
| 946 | clone->rq_disk = dev->bdev->bd_disk; |
| 947 | |
| 948 | __rq_for_each_bio(bio_src, clone) { |
| 949 | bio_src->bi_bdev = dev->bdev; |
| 950 | /* Currently the way req-dm works is that once the underlying |
| 951 | * device driver completes the request by calling into the |
| 952 | * block layer. The block layer completes the bios (clones) and |
| 953 | * then the cloned request. This is undesirable for req-dm-crypt |
| 954 | * hence added a flag BIO_DONTFREE, this flag will ensure that |
| 955 | * blk layer does not complete the cloned bios before completing |
| 956 | * the request. When the crypt endio is called, post-processing |
| 957 | * is done and then the dm layer will complete the bios (clones) |
| 958 | * and free them. |
| 959 | */ |
| 960 | if (encryption_mode == DM_REQ_CRYPT_ENCRYPTION_MODE_TRANSPARENT) |
| 961 | bio_src->bi_flags |= 1 << BIO_INLINECRYPT; |
| 962 | else |
| 963 | bio_src->bi_flags |= 1 << BIO_DONTFREE; |
| 964 | |
| 965 | /* |
| 966 | * If this device has partitions, remap block n |
| 967 | * of partition p to block n+start(p) of the disk. |
| 968 | */ |
| 969 | req_crypt_blk_partition_remap(bio_src); |
| 970 | if (copy_bio_sector_to_req == 0) { |
| 971 | clone->__sector = bio_src->bi_iter.bi_sector; |
| 972 | copy_bio_sector_to_req++; |
| 973 | } |
| 974 | blk_queue_bounce(clone->q, &bio_src); |
| 975 | } |
| 976 | |
| 977 | if (encryption_mode == DM_REQ_CRYPT_ENCRYPTION_MODE_TRANSPARENT) { |
| 978 | /* Set all crypto parameters for inline crypto engine */ |
| 979 | memcpy(&req_io->ice_settings, ice_settings, |
| 980 | sizeof(struct ice_crypto_setting)); |
| 981 | } else { |
| 982 | /* ICE checks for key_index which could be >= 0. If a chip has |
| 983 | * both ICE and GPCE and wanted to use GPCE, there could be |
| 984 | * issue. Storage driver send all requests to ICE driver. If |
| 985 | * it sees key_index as 0, it would assume it is for ICE while |
| 986 | * it is not. Hence set invalid key index by default. |
| 987 | */ |
| 988 | req_io->ice_settings.key_index = -1; |
| 989 | |
| 990 | } |
| 991 | |
| 992 | if (rq_data_dir(clone) == READ || |
| 993 | encryption_mode == DM_REQ_CRYPT_ENCRYPTION_MODE_TRANSPARENT) { |
| 994 | error = DM_MAPIO_REMAPPED; |
| 995 | goto submit_request; |
| 996 | } else if (rq_data_dir(clone) == WRITE) { |
| 997 | req_cryptd_queue_crypt(req_io); |
| 998 | error = DM_MAPIO_SUBMITTED; |
| 999 | goto submit_request; |
| 1000 | } |
| 1001 | |
| 1002 | submit_request: |
| 1003 | return error; |
| 1004 | |
| 1005 | } |
| 1006 | |
| 1007 | static void deconfigure_qcrypto(void) |
| 1008 | { |
| 1009 | mempool_destroy(req_page_pool); |
| 1010 | req_page_pool = NULL; |
| 1011 | |
| 1012 | mempool_destroy(req_scatterlist_pool); |
| 1013 | req_scatterlist_pool = NULL; |
| 1014 | |
| 1015 | if (req_crypt_split_io_queue) { |
| 1016 | destroy_workqueue(req_crypt_split_io_queue); |
| 1017 | req_crypt_split_io_queue = NULL; |
| 1018 | } |
| 1019 | if (req_crypt_queue) { |
| 1020 | destroy_workqueue(req_crypt_queue); |
| 1021 | req_crypt_queue = NULL; |
| 1022 | } |
| 1023 | |
| 1024 | kmem_cache_destroy(_req_dm_scatterlist_pool); |
| 1025 | |
| 1026 | mutex_lock(&engine_list_mutex); |
| 1027 | kfree(pfe_eng); |
| 1028 | pfe_eng = NULL; |
| 1029 | kfree(fde_eng); |
| 1030 | fde_eng = NULL; |
| 1031 | mutex_unlock(&engine_list_mutex); |
| 1032 | |
| 1033 | if (tfm) { |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 1034 | crypto_free_skcipher(tfm); |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 1035 | tfm = NULL; |
| 1036 | } |
| 1037 | } |
| 1038 | |
| 1039 | static void req_crypt_dtr(struct dm_target *ti) |
| 1040 | { |
| 1041 | DMDEBUG("dm-req-crypt Destructor.\n"); |
| 1042 | |
| 1043 | mempool_destroy(req_io_pool); |
| 1044 | req_io_pool = NULL; |
| 1045 | |
| 1046 | if (encryption_mode == DM_REQ_CRYPT_ENCRYPTION_MODE_TRANSPARENT) { |
| 1047 | kfree(ice_settings); |
| 1048 | ice_settings = NULL; |
| 1049 | } else { |
| 1050 | deconfigure_qcrypto(); |
| 1051 | } |
| 1052 | |
| 1053 | kmem_cache_destroy(_req_crypt_io_pool); |
| 1054 | |
| 1055 | if (dev) { |
| 1056 | dm_put_device(ti, dev); |
| 1057 | dev = NULL; |
| 1058 | } |
| 1059 | } |
| 1060 | |
| 1061 | static int configure_qcrypto(void) |
| 1062 | { |
| 1063 | struct crypto_engine_entry *eng_list = NULL; |
| 1064 | struct block_device *bdev = NULL; |
| 1065 | int err = DM_REQ_CRYPT_ERROR, i; |
| 1066 | struct request_queue *q = NULL; |
| 1067 | |
| 1068 | bdev = dev->bdev; |
| 1069 | q = bdev_get_queue(bdev); |
| 1070 | blk_queue_max_hw_sectors(q, DM_REQ_CRYPT_QUEUE_SIZE); |
| 1071 | |
| 1072 | /* Allocate the crypto alloc blk cipher and keep the handle */ |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 1073 | tfm = crypto_alloc_skcipher("qcom-xts(aes)", 0, 0); |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 1074 | if (IS_ERR(tfm)) { |
AnilKumar Chimata | ddc4812 | 2017-06-23 03:12:57 -0700 | [diff] [blame^] | 1075 | DMERR("%s skcipher tfm allocation failed : error\n", |
AnilKumar Chimata | 7214d7e | 2017-06-23 03:09:59 -0700 | [diff] [blame] | 1076 | __func__); |
| 1077 | tfm = NULL; |
| 1078 | goto exit_err; |
| 1079 | } |
| 1080 | |
| 1081 | num_engines_fde = num_engines_pfe = 0; |
| 1082 | |
| 1083 | mutex_lock(&engine_list_mutex); |
| 1084 | num_engines = (dm_qcrypto_func.get_num_engines)(); |
| 1085 | if (!num_engines) { |
| 1086 | DMERR(KERN_INFO "%s qcrypto_get_num_engines failed\n", |
| 1087 | __func__); |
| 1088 | err = DM_REQ_CRYPT_ERROR; |
| 1089 | mutex_unlock(&engine_list_mutex); |
| 1090 | goto exit_err; |
| 1091 | } |
| 1092 | |
| 1093 | eng_list = kcalloc(num_engines, sizeof(*eng_list), GFP_KERNEL); |
| 1094 | if (eng_list == NULL) { |
| 1095 | DMERR("%s engine list allocation failed\n", __func__); |
| 1096 | err = DM_REQ_CRYPT_ERROR; |
| 1097 | mutex_unlock(&engine_list_mutex); |
| 1098 | goto exit_err; |
| 1099 | } |
| 1100 | |
| 1101 | (dm_qcrypto_func.get_engine_list)(num_engines, eng_list); |
| 1102 | |
| 1103 | for (i = 0; i < num_engines; i++) { |
| 1104 | if (eng_list[i].ce_device == FDE_KEY_ID) |
| 1105 | num_engines_fde++; |
| 1106 | if (eng_list[i].ce_device == PFE_KEY_ID) |
| 1107 | num_engines_pfe++; |
| 1108 | } |
| 1109 | |
| 1110 | fde_eng = kcalloc(num_engines_fde, sizeof(*fde_eng), GFP_KERNEL); |
| 1111 | if (fde_eng == NULL) { |
| 1112 | DMERR("%s fde engine list allocation failed\n", __func__); |
| 1113 | mutex_unlock(&engine_list_mutex); |
| 1114 | goto exit_err; |
| 1115 | } |
| 1116 | |
| 1117 | pfe_eng = kcalloc(num_engines_pfe, sizeof(*pfe_eng), GFP_KERNEL); |
| 1118 | if (pfe_eng == NULL) { |
| 1119 | DMERR("%s pfe engine list allocation failed\n", __func__); |
| 1120 | mutex_unlock(&engine_list_mutex); |
| 1121 | goto exit_err; |
| 1122 | } |
| 1123 | |
| 1124 | fde_cursor = 0; |
| 1125 | pfe_cursor = 0; |
| 1126 | |
| 1127 | for (i = 0; i < num_engines; i++) { |
| 1128 | if (eng_list[i].ce_device == FDE_KEY_ID) |
| 1129 | fde_eng[fde_cursor++] = eng_list[i]; |
| 1130 | if (eng_list[i].ce_device == PFE_KEY_ID) |
| 1131 | pfe_eng[pfe_cursor++] = eng_list[i]; |
| 1132 | } |
| 1133 | |
| 1134 | fde_cursor = 0; |
| 1135 | pfe_cursor = 0; |
| 1136 | mutex_unlock(&engine_list_mutex); |
| 1137 | |
| 1138 | _req_dm_scatterlist_pool = kmem_cache_create("req_dm_scatterlist", |
| 1139 | sizeof(struct scatterlist) * MAX_SG_LIST, |
| 1140 | __alignof__(struct scatterlist), 0, NULL); |
| 1141 | if (!_req_dm_scatterlist_pool) |
| 1142 | goto exit_err; |
| 1143 | |
| 1144 | req_crypt_queue = alloc_workqueue("req_cryptd", |
| 1145 | WQ_UNBOUND | |
| 1146 | WQ_CPU_INTENSIVE | |
| 1147 | WQ_MEM_RECLAIM, |
| 1148 | 0); |
| 1149 | if (!req_crypt_queue) { |
| 1150 | DMERR("%s req_crypt_queue not allocated\n", __func__); |
| 1151 | goto exit_err; |
| 1152 | } |
| 1153 | |
| 1154 | req_crypt_split_io_queue = alloc_workqueue("req_crypt_split", |
| 1155 | WQ_UNBOUND | |
| 1156 | WQ_CPU_INTENSIVE | |
| 1157 | WQ_MEM_RECLAIM, |
| 1158 | 0); |
| 1159 | if (!req_crypt_split_io_queue) { |
| 1160 | DMERR("%s req_crypt_split_io_queue not allocated\n", __func__); |
| 1161 | goto exit_err; |
| 1162 | } |
| 1163 | req_scatterlist_pool = mempool_create_slab_pool(MIN_IOS, |
| 1164 | _req_dm_scatterlist_pool); |
| 1165 | if (!req_scatterlist_pool) { |
| 1166 | DMERR("%s req_scatterlist_pool is not allocated\n", __func__); |
| 1167 | err = -ENOMEM; |
| 1168 | goto exit_err; |
| 1169 | } |
| 1170 | |
| 1171 | req_page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
| 1172 | if (!req_page_pool) { |
| 1173 | DMERR("%s req_page_pool not allocated\n", __func__); |
| 1174 | goto exit_err; |
| 1175 | } |
| 1176 | |
| 1177 | err = 0; |
| 1178 | |
| 1179 | exit_err: |
| 1180 | kfree(eng_list); |
| 1181 | return err; |
| 1182 | } |
| 1183 | |
| 1184 | /* |
| 1185 | * Construct an encryption mapping: |
| 1186 | * <cipher> <key> <iv_offset> <dev_path> <start> |
| 1187 | */ |
| 1188 | static int req_crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) |
| 1189 | { |
| 1190 | int err = DM_REQ_CRYPT_ERROR; |
| 1191 | unsigned long long tmpll; |
| 1192 | char dummy; |
| 1193 | int ret; |
| 1194 | |
| 1195 | DMDEBUG("dm-req-crypt Constructor.\n"); |
| 1196 | |
| 1197 | if (argc < 5) { |
| 1198 | DMERR(" %s Not enough args\n", __func__); |
| 1199 | err = DM_REQ_CRYPT_ERROR; |
| 1200 | goto ctr_exit; |
| 1201 | } |
| 1202 | |
| 1203 | if (argv[3]) { |
| 1204 | if (dm_get_device(ti, argv[3], |
| 1205 | dm_table_get_mode(ti->table), &dev)) { |
| 1206 | DMERR(" %s Device Lookup failed\n", __func__); |
| 1207 | err = DM_REQ_CRYPT_ERROR; |
| 1208 | goto ctr_exit; |
| 1209 | } |
| 1210 | } else { |
| 1211 | DMERR(" %s Arg[3] invalid\n", __func__); |
| 1212 | err = DM_REQ_CRYPT_ERROR; |
| 1213 | goto ctr_exit; |
| 1214 | } |
| 1215 | |
| 1216 | if (argv[4]) { |
| 1217 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
| 1218 | DMERR("%s Invalid device sector\n", __func__); |
| 1219 | err = DM_REQ_CRYPT_ERROR; |
| 1220 | goto ctr_exit; |
| 1221 | } |
| 1222 | } else { |
| 1223 | DMERR(" %s Arg[4] invalid\n", __func__); |
| 1224 | err = DM_REQ_CRYPT_ERROR; |
| 1225 | goto ctr_exit; |
| 1226 | } |
| 1227 | start_sector_orig = tmpll; |
| 1228 | |
| 1229 | /* Allow backward compatible */ |
| 1230 | if (argc >= 6) { |
| 1231 | if (argv[5]) { |
| 1232 | if (!strcmp(argv[5], "fde_enabled")) |
| 1233 | is_fde_enabled = true; |
| 1234 | else |
| 1235 | is_fde_enabled = false; |
| 1236 | } else { |
| 1237 | DMERR(" %s Arg[5] invalid\n", __func__); |
| 1238 | err = DM_REQ_CRYPT_ERROR; |
| 1239 | goto ctr_exit; |
| 1240 | } |
| 1241 | } else { |
| 1242 | DMERR(" %s Arg[5] missing, set FDE enabled.\n", __func__); |
| 1243 | is_fde_enabled = true; /* backward compatible */ |
| 1244 | } |
| 1245 | |
| 1246 | _req_crypt_io_pool = KMEM_CACHE(req_dm_crypt_io, 0); |
| 1247 | if (!_req_crypt_io_pool) { |
| 1248 | err = DM_REQ_CRYPT_ERROR; |
| 1249 | goto ctr_exit; |
| 1250 | } |
| 1251 | |
| 1252 | encryption_mode = DM_REQ_CRYPT_ENCRYPTION_MODE_CRYPTO; |
| 1253 | if (argc >= 7 && argv[6]) { |
| 1254 | if (!strcmp(argv[6], "ice")) |
| 1255 | encryption_mode = |
| 1256 | DM_REQ_CRYPT_ENCRYPTION_MODE_TRANSPARENT; |
| 1257 | } |
| 1258 | |
| 1259 | if (encryption_mode == DM_REQ_CRYPT_ENCRYPTION_MODE_TRANSPARENT) { |
| 1260 | /* configure ICE settings */ |
| 1261 | ice_settings = |
| 1262 | kzalloc(sizeof(struct ice_crypto_setting), GFP_KERNEL); |
| 1263 | if (!ice_settings) { |
| 1264 | err = -ENOMEM; |
| 1265 | goto ctr_exit; |
| 1266 | } |
| 1267 | ice_settings->key_size = ICE_CRYPTO_KEY_SIZE_128; |
| 1268 | ice_settings->algo_mode = ICE_CRYPTO_ALGO_MODE_AES_XTS; |
| 1269 | ice_settings->key_mode = ICE_CRYPTO_USE_LUT_SW_KEY; |
| 1270 | if (kstrtou16(argv[1], 0, &ice_settings->key_index) || |
| 1271 | ice_settings->key_index < 0 || |
| 1272 | ice_settings->key_index > MAX_MSM_ICE_KEY_LUT_SIZE) { |
| 1273 | DMERR("%s Err: key index %d received for ICE\n", |
| 1274 | __func__, ice_settings->key_index); |
| 1275 | err = DM_REQ_CRYPT_ERROR; |
| 1276 | goto ctr_exit; |
| 1277 | } |
| 1278 | } else { |
| 1279 | ret = configure_qcrypto(); |
| 1280 | if (ret) { |
| 1281 | DMERR("%s failed to configure qcrypto\n", __func__); |
| 1282 | err = ret; |
| 1283 | goto ctr_exit; |
| 1284 | } |
| 1285 | } |
| 1286 | |
| 1287 | req_io_pool = mempool_create_slab_pool(MIN_IOS, _req_crypt_io_pool); |
| 1288 | if (!req_io_pool) { |
| 1289 | DMERR("%s req_io_pool not allocated\n", __func__); |
| 1290 | err = -ENOMEM; |
| 1291 | goto ctr_exit; |
| 1292 | } |
| 1293 | |
| 1294 | /* |
| 1295 | * If underlying device supports flush/discard, mapped target |
| 1296 | * should also allow it |
| 1297 | */ |
| 1298 | ti->num_flush_bios = 1; |
| 1299 | ti->num_discard_bios = 1; |
| 1300 | |
| 1301 | err = 0; |
| 1302 | DMINFO("%s: Mapping block_device %s to dm-req-crypt ok!\n", |
| 1303 | __func__, argv[3]); |
| 1304 | ctr_exit: |
| 1305 | if (err) |
| 1306 | req_crypt_dtr(ti); |
| 1307 | |
| 1308 | return err; |
| 1309 | } |
| 1310 | |
| 1311 | static int req_crypt_iterate_devices(struct dm_target *ti, |
| 1312 | iterate_devices_callout_fn fn, void *data) |
| 1313 | { |
| 1314 | return fn(ti, dev, start_sector_orig, ti->len, data); |
| 1315 | } |
| 1316 | void set_qcrypto_func_dm(void *dev, |
| 1317 | void *flag, |
| 1318 | void *engines, |
| 1319 | void *engine_list) |
| 1320 | { |
| 1321 | dm_qcrypto_func.cipher_set = dev; |
| 1322 | dm_qcrypto_func.cipher_flag = flag; |
| 1323 | dm_qcrypto_func.get_num_engines = engines; |
| 1324 | dm_qcrypto_func.get_engine_list = engine_list; |
| 1325 | } |
| 1326 | EXPORT_SYMBOL(set_qcrypto_func_dm); |
| 1327 | |
| 1328 | static struct target_type req_crypt_target = { |
| 1329 | .name = "req-crypt", |
| 1330 | .version = {1, 0, 0}, |
| 1331 | .module = THIS_MODULE, |
| 1332 | .ctr = req_crypt_ctr, |
| 1333 | .dtr = req_crypt_dtr, |
| 1334 | .map_rq = req_crypt_map, |
| 1335 | .rq_end_io = req_crypt_endio, |
| 1336 | .iterate_devices = req_crypt_iterate_devices, |
| 1337 | }; |
| 1338 | |
| 1339 | static int __init req_dm_crypt_init(void) |
| 1340 | { |
| 1341 | int r; |
| 1342 | |
| 1343 | |
| 1344 | r = dm_register_target(&req_crypt_target); |
| 1345 | if (r < 0) { |
| 1346 | DMERR("register failed %d", r); |
| 1347 | return r; |
| 1348 | } |
| 1349 | |
| 1350 | DMINFO("dm-req-crypt successfully initalized.\n"); |
| 1351 | |
| 1352 | return r; |
| 1353 | } |
| 1354 | |
| 1355 | static void __exit req_dm_crypt_exit(void) |
| 1356 | { |
| 1357 | dm_unregister_target(&req_crypt_target); |
| 1358 | } |
| 1359 | |
| 1360 | module_init(req_dm_crypt_init); |
| 1361 | module_exit(req_dm_crypt_exit); |
| 1362 | |
| 1363 | MODULE_DESCRIPTION(DM_NAME " target for request based transparent encryption / decryption"); |
| 1364 | MODULE_LICENSE("GPL v2"); |