1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved. 4 */ 5 6 #include <linux/device.h> 7 #include <linux/interrupt.h> 8 #include <linux/moduleparam.h> 9 #include <linux/types.h> 10 #include <crypto/aes.h> 11 #include <crypto/internal/des.h> 12 #include <crypto/internal/skcipher.h> 13 14 #include "cipher.h" 15 16 static unsigned int aes_sw_max_len = CONFIG_CRYPTO_DEV_QCE_SW_MAX_LEN; 17 module_param(aes_sw_max_len, uint, 0644); 18 MODULE_PARM_DESC(aes_sw_max_len, 19 "Only use hardware for AES requests larger than this " 20 "[0=always use hardware; anything <16 breaks AES-GCM; default=" 21 __stringify(CONFIG_CRYPTO_DEV_QCE_SW_MAX_LEN)"]"); 22 23 static LIST_HEAD(skcipher_algs); 24 25 static void qce_skcipher_done(void *data) 26 { 27 struct crypto_async_request *async_req = data; 28 struct skcipher_request *req = skcipher_request_cast(async_req); 29 struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req); 30 struct qce_alg_template *tmpl = to_cipher_tmpl(crypto_skcipher_reqtfm(req)); 31 struct qce_device *qce = tmpl->qce; 32 struct qce_result_dump *result_buf = qce->dma.result_buf; 33 enum dma_data_direction dir_src, dir_dst; 34 u32 status; 35 int error; 36 bool diff_dst; 37 38 diff_dst = (req->src != req->dst) ? true : false; 39 dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL; 40 dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL; 41 42 error = qce_dma_terminate_all(&qce->dma); 43 if (error) 44 dev_dbg(qce->dev, "skcipher dma termination error (%d)\n", 45 error); 46 47 if (diff_dst) 48 dma_unmap_sg(qce->dev, rctx->src_sg, rctx->src_nents, dir_src); 49 dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst); 50 51 sg_free_table(&rctx->dst_tbl); 52 53 error = qce_check_status(qce, &status); 54 if (error < 0) 55 dev_dbg(qce->dev, "skcipher operation error (%x)\n", status); 56 57 memcpy(rctx->iv, result_buf->encr_cntr_iv, rctx->ivsize); 58 qce->async_req_done(tmpl->qce, error); 59 } 60 61 static int 62 qce_skcipher_async_req_handle(struct crypto_async_request *async_req) 63 { 64 struct skcipher_request *req = skcipher_request_cast(async_req); 65 struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req); 66 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); 67 struct qce_alg_template *tmpl = to_cipher_tmpl(crypto_skcipher_reqtfm(req)); 68 struct qce_device *qce = tmpl->qce; 69 enum dma_data_direction dir_src, dir_dst; 70 struct scatterlist *sg; 71 bool diff_dst; 72 gfp_t gfp; 73 int ret; 74 75 rctx->iv = req->iv; 76 rctx->ivsize = crypto_skcipher_ivsize(skcipher); 77 rctx->cryptlen = req->cryptlen; 78 79 diff_dst = (req->src != req->dst) ? true : false; 80 dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL; 81 dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL; 82 83 rctx->src_nents = sg_nents_for_len(req->src, req->cryptlen); 84 if (diff_dst) 85 rctx->dst_nents = sg_nents_for_len(req->dst, req->cryptlen); 86 else 87 rctx->dst_nents = rctx->src_nents; 88 if (rctx->src_nents < 0) { 89 dev_err(qce->dev, "Invalid numbers of src SG.\n"); 90 return rctx->src_nents; 91 } 92 if (rctx->dst_nents < 0) { 93 dev_err(qce->dev, "Invalid numbers of dst SG.\n"); 94 return -rctx->dst_nents; 95 } 96 97 rctx->dst_nents += 1; 98 99 gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? 100 GFP_KERNEL : GFP_ATOMIC; 101 102 ret = sg_alloc_table(&rctx->dst_tbl, rctx->dst_nents, gfp); 103 if (ret) 104 return ret; 105 106 sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ); 107 108 sg = qce_sgtable_add(&rctx->dst_tbl, req->dst, req->cryptlen); 109 if (IS_ERR(sg)) { 110 ret = PTR_ERR(sg); 111 goto error_free; 112 } 113 114 sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg, 115 QCE_RESULT_BUF_SZ); 116 if (IS_ERR(sg)) { 117 ret = PTR_ERR(sg); 118 goto error_free; 119 } 120 121 sg_mark_end(sg); 122 rctx->dst_sg = rctx->dst_tbl.sgl; 123 124 ret = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst); 125 if (ret < 0) 126 goto error_free; 127 128 if (diff_dst) { 129 ret = dma_map_sg(qce->dev, req->src, rctx->src_nents, dir_src); 130 if (ret < 0) 131 goto error_unmap_dst; 132 rctx->src_sg = req->src; 133 } else { 134 rctx->src_sg = rctx->dst_sg; 135 } 136 137 ret = qce_dma_prep_sgs(&qce->dma, rctx->src_sg, rctx->src_nents, 138 rctx->dst_sg, rctx->dst_nents, 139 qce_skcipher_done, async_req); 140 if (ret) 141 goto error_unmap_src; 142 143 qce_dma_issue_pending(&qce->dma); 144 145 ret = qce_start(async_req, tmpl->crypto_alg_type, req->cryptlen, 0); 146 if (ret) 147 goto error_terminate; 148 149 return 0; 150 151 error_terminate: 152 qce_dma_terminate_all(&qce->dma); 153 error_unmap_src: 154 if (diff_dst) 155 dma_unmap_sg(qce->dev, req->src, rctx->src_nents, dir_src); 156 error_unmap_dst: 157 dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst); 158 error_free: 159 sg_free_table(&rctx->dst_tbl); 160 return ret; 161 } 162 163 static int qce_skcipher_setkey(struct crypto_skcipher *ablk, const u8 *key, 164 unsigned int keylen) 165 { 166 struct crypto_tfm *tfm = crypto_skcipher_tfm(ablk); 167 struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm); 168 unsigned long flags = to_cipher_tmpl(ablk)->alg_flags; 169 int ret; 170 171 if (!key || !keylen) 172 return -EINVAL; 173 174 switch (IS_XTS(flags) ? keylen >> 1 : keylen) { 175 case AES_KEYSIZE_128: 176 case AES_KEYSIZE_256: 177 memcpy(ctx->enc_key, key, keylen); 178 break; 179 } 180 181 ret = crypto_sync_skcipher_setkey(ctx->fallback, key, keylen); 182 if (!ret) 183 ctx->enc_keylen = keylen; 184 return ret; 185 } 186 187 static int qce_des_setkey(struct crypto_skcipher *ablk, const u8 *key, 188 unsigned int keylen) 189 { 190 struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(ablk); 191 int err; 192 193 err = verify_skcipher_des_key(ablk, key); 194 if (err) 195 return err; 196 197 ctx->enc_keylen = keylen; 198 memcpy(ctx->enc_key, key, keylen); 199 return 0; 200 } 201 202 static int qce_des3_setkey(struct crypto_skcipher *ablk, const u8 *key, 203 unsigned int keylen) 204 { 205 struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(ablk); 206 int err; 207 208 err = verify_skcipher_des3_key(ablk, key); 209 if (err) 210 return err; 211 212 ctx->enc_keylen = keylen; 213 memcpy(ctx->enc_key, key, keylen); 214 return 0; 215 } 216 217 static int qce_skcipher_crypt(struct skcipher_request *req, int encrypt) 218 { 219 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 220 struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm); 221 struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req); 222 struct qce_alg_template *tmpl = to_cipher_tmpl(tfm); 223 int keylen; 224 int ret; 225 226 rctx->flags = tmpl->alg_flags; 227 rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT; 228 keylen = IS_XTS(rctx->flags) ? ctx->enc_keylen >> 1 : ctx->enc_keylen; 229 230 /* qce is hanging when AES-XTS request len > QCE_SECTOR_SIZE and 231 * is not a multiple of it; pass such requests to the fallback 232 */ 233 if (IS_AES(rctx->flags) && 234 (((keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_256) || 235 req->cryptlen <= aes_sw_max_len) || 236 (IS_XTS(rctx->flags) && req->cryptlen > QCE_SECTOR_SIZE && 237 req->cryptlen % QCE_SECTOR_SIZE))) { 238 SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); 239 240 skcipher_request_set_sync_tfm(subreq, ctx->fallback); 241 skcipher_request_set_callback(subreq, req->base.flags, 242 NULL, NULL); 243 skcipher_request_set_crypt(subreq, req->src, req->dst, 244 req->cryptlen, req->iv); 245 ret = encrypt ? crypto_skcipher_encrypt(subreq) : 246 crypto_skcipher_decrypt(subreq); 247 skcipher_request_zero(subreq); 248 return ret; 249 } 250 251 return tmpl->qce->async_req_enqueue(tmpl->qce, &req->base); 252 } 253 254 static int qce_skcipher_encrypt(struct skcipher_request *req) 255 { 256 return qce_skcipher_crypt(req, 1); 257 } 258 259 static int qce_skcipher_decrypt(struct skcipher_request *req) 260 { 261 return qce_skcipher_crypt(req, 0); 262 } 263 264 static int qce_skcipher_init(struct crypto_skcipher *tfm) 265 { 266 struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm); 267 268 memset(ctx, 0, sizeof(*ctx)); 269 crypto_skcipher_set_reqsize(tfm, sizeof(struct qce_cipher_reqctx)); 270 return 0; 271 } 272 273 static int qce_skcipher_init_fallback(struct crypto_skcipher *tfm) 274 { 275 struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm); 276 277 qce_skcipher_init(tfm); 278 ctx->fallback = crypto_alloc_sync_skcipher(crypto_tfm_alg_name(&tfm->base), 279 0, CRYPTO_ALG_NEED_FALLBACK); 280 return PTR_ERR_OR_ZERO(ctx->fallback); 281 } 282 283 static void qce_skcipher_exit(struct crypto_skcipher *tfm) 284 { 285 struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm); 286 287 crypto_free_sync_skcipher(ctx->fallback); 288 } 289 290 struct qce_skcipher_def { 291 unsigned long flags; 292 const char *name; 293 const char *drv_name; 294 unsigned int blocksize; 295 unsigned int chunksize; 296 unsigned int ivsize; 297 unsigned int min_keysize; 298 unsigned int max_keysize; 299 }; 300 301 static const struct qce_skcipher_def skcipher_def[] = { 302 { 303 .flags = QCE_ALG_AES | QCE_MODE_ECB, 304 .name = "ecb(aes)", 305 .drv_name = "ecb-aes-qce", 306 .blocksize = AES_BLOCK_SIZE, 307 .ivsize = AES_BLOCK_SIZE, 308 .min_keysize = AES_MIN_KEY_SIZE, 309 .max_keysize = AES_MAX_KEY_SIZE, 310 }, 311 { 312 .flags = QCE_ALG_AES | QCE_MODE_CBC, 313 .name = "cbc(aes)", 314 .drv_name = "cbc-aes-qce", 315 .blocksize = AES_BLOCK_SIZE, 316 .ivsize = AES_BLOCK_SIZE, 317 .min_keysize = AES_MIN_KEY_SIZE, 318 .max_keysize = AES_MAX_KEY_SIZE, 319 }, 320 { 321 .flags = QCE_ALG_AES | QCE_MODE_CTR, 322 .name = "ctr(aes)", 323 .drv_name = "ctr-aes-qce", 324 .blocksize = 1, 325 .chunksize = AES_BLOCK_SIZE, 326 .ivsize = AES_BLOCK_SIZE, 327 .min_keysize = AES_MIN_KEY_SIZE, 328 .max_keysize = AES_MAX_KEY_SIZE, 329 }, 330 { 331 .flags = QCE_ALG_AES | QCE_MODE_XTS, 332 .name = "xts(aes)", 333 .drv_name = "xts-aes-qce", 334 .blocksize = AES_BLOCK_SIZE, 335 .ivsize = AES_BLOCK_SIZE, 336 .min_keysize = AES_MIN_KEY_SIZE * 2, 337 .max_keysize = AES_MAX_KEY_SIZE * 2, 338 }, 339 { 340 .flags = QCE_ALG_DES | QCE_MODE_ECB, 341 .name = "ecb(des)", 342 .drv_name = "ecb-des-qce", 343 .blocksize = DES_BLOCK_SIZE, 344 .ivsize = 0, 345 .min_keysize = DES_KEY_SIZE, 346 .max_keysize = DES_KEY_SIZE, 347 }, 348 { 349 .flags = QCE_ALG_DES | QCE_MODE_CBC, 350 .name = "cbc(des)", 351 .drv_name = "cbc-des-qce", 352 .blocksize = DES_BLOCK_SIZE, 353 .ivsize = DES_BLOCK_SIZE, 354 .min_keysize = DES_KEY_SIZE, 355 .max_keysize = DES_KEY_SIZE, 356 }, 357 { 358 .flags = QCE_ALG_3DES | QCE_MODE_ECB, 359 .name = "ecb(des3_ede)", 360 .drv_name = "ecb-3des-qce", 361 .blocksize = DES3_EDE_BLOCK_SIZE, 362 .ivsize = 0, 363 .min_keysize = DES3_EDE_KEY_SIZE, 364 .max_keysize = DES3_EDE_KEY_SIZE, 365 }, 366 { 367 .flags = QCE_ALG_3DES | QCE_MODE_CBC, 368 .name = "cbc(des3_ede)", 369 .drv_name = "cbc-3des-qce", 370 .blocksize = DES3_EDE_BLOCK_SIZE, 371 .ivsize = DES3_EDE_BLOCK_SIZE, 372 .min_keysize = DES3_EDE_KEY_SIZE, 373 .max_keysize = DES3_EDE_KEY_SIZE, 374 }, 375 }; 376 377 static int qce_skcipher_register_one(const struct qce_skcipher_def *def, 378 struct qce_device *qce) 379 { 380 struct qce_alg_template *tmpl; 381 struct skcipher_alg *alg; 382 int ret; 383 384 tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL); 385 if (!tmpl) 386 return -ENOMEM; 387 388 alg = &tmpl->alg.skcipher; 389 390 snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); 391 snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", 392 def->drv_name); 393 394 alg->base.cra_blocksize = def->blocksize; 395 alg->chunksize = def->chunksize; 396 alg->ivsize = def->ivsize; 397 alg->min_keysize = def->min_keysize; 398 alg->max_keysize = def->max_keysize; 399 alg->setkey = IS_3DES(def->flags) ? qce_des3_setkey : 400 IS_DES(def->flags) ? qce_des_setkey : 401 qce_skcipher_setkey; 402 alg->encrypt = qce_skcipher_encrypt; 403 alg->decrypt = qce_skcipher_decrypt; 404 405 alg->base.cra_priority = 300; 406 alg->base.cra_flags = CRYPTO_ALG_ASYNC | 407 CRYPTO_ALG_KERN_DRIVER_ONLY; 408 alg->base.cra_ctxsize = sizeof(struct qce_cipher_ctx); 409 alg->base.cra_alignmask = 0; 410 alg->base.cra_module = THIS_MODULE; 411 412 if (IS_AES(def->flags)) { 413 alg->base.cra_flags |= CRYPTO_ALG_NEED_FALLBACK; 414 alg->init = qce_skcipher_init_fallback; 415 alg->exit = qce_skcipher_exit; 416 } else { 417 alg->init = qce_skcipher_init; 418 } 419 420 INIT_LIST_HEAD(&tmpl->entry); 421 tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_SKCIPHER; 422 tmpl->alg_flags = def->flags; 423 tmpl->qce = qce; 424 425 ret = crypto_register_skcipher(alg); 426 if (ret) { 427 kfree(tmpl); 428 dev_err(qce->dev, "%s registration failed\n", alg->base.cra_name); 429 return ret; 430 } 431 432 list_add_tail(&tmpl->entry, &skcipher_algs); 433 dev_dbg(qce->dev, "%s is registered\n", alg->base.cra_name); 434 return 0; 435 } 436 437 static void qce_skcipher_unregister(struct qce_device *qce) 438 { 439 struct qce_alg_template *tmpl, *n; 440 441 list_for_each_entry_safe(tmpl, n, &skcipher_algs, entry) { 442 crypto_unregister_skcipher(&tmpl->alg.skcipher); 443 list_del(&tmpl->entry); 444 kfree(tmpl); 445 } 446 } 447 448 static int qce_skcipher_register(struct qce_device *qce) 449 { 450 int ret, i; 451 452 for (i = 0; i < ARRAY_SIZE(skcipher_def); i++) { 453 ret = qce_skcipher_register_one(&skcipher_def[i], qce); 454 if (ret) 455 goto err; 456 } 457 458 return 0; 459 err: 460 qce_skcipher_unregister(qce); 461 return ret; 462 } 463 464 const struct qce_algo_ops skcipher_ops = { 465 .type = CRYPTO_ALG_TYPE_SKCIPHER, 466 .register_algs = qce_skcipher_register, 467 .unregister_algs = qce_skcipher_unregister, 468 .async_req_handle = qce_skcipher_async_req_handle, 469 }; 470