1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * pcrypt - Parallel crypto wrapper. 4 * 5 * Copyright (C) 2009 secunet Security Networks AG 6 * Copyright (C) 2009 Steffen Klassert <[email protected]> 7 */ 8 9 #include <crypto/algapi.h> 10 #include <crypto/internal/aead.h> 11 #include <linux/atomic.h> 12 #include <linux/err.h> 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/slab.h> 16 #include <linux/notifier.h> 17 #include <linux/kobject.h> 18 #include <linux/cpu.h> 19 #include <crypto/pcrypt.h> 20 21 static struct padata_instance *pencrypt; 22 static struct padata_instance *pdecrypt; 23 static struct kset *pcrypt_kset; 24 25 struct pcrypt_instance_ctx { 26 struct crypto_aead_spawn spawn; 27 struct padata_shell *psenc; 28 struct padata_shell *psdec; 29 atomic_t tfm_count; 30 }; 31 32 struct pcrypt_aead_ctx { 33 struct crypto_aead *child; 34 unsigned int cb_cpu; 35 }; 36 37 static inline struct pcrypt_instance_ctx *pcrypt_tfm_ictx( 38 struct crypto_aead *tfm) 39 { 40 return aead_instance_ctx(aead_alg_instance(tfm)); 41 } 42 43 static int pcrypt_aead_setkey(struct crypto_aead *parent, 44 const u8 *key, unsigned int keylen) 45 { 46 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent); 47 48 return crypto_aead_setkey(ctx->child, key, keylen); 49 } 50 51 static int pcrypt_aead_setauthsize(struct crypto_aead *parent, 52 unsigned int authsize) 53 { 54 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent); 55 56 return crypto_aead_setauthsize(ctx->child, authsize); 57 } 58 59 static void pcrypt_aead_serial(struct padata_priv *padata) 60 { 61 struct pcrypt_request *preq = pcrypt_padata_request(padata); 62 struct aead_request *req = pcrypt_request_ctx(preq); 63 64 aead_request_complete(req->base.data, padata->info); 65 } 66 67 static void pcrypt_aead_done(struct crypto_async_request *areq, int err) 68 { 69 struct aead_request *req = areq->data; 70 struct pcrypt_request *preq = aead_request_ctx(req); 71 struct padata_priv *padata = pcrypt_request_padata(preq); 72 73 padata->info = err; 74 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; 75 76 padata_do_serial(padata); 77 } 78 79 static void pcrypt_aead_enc(struct padata_priv *padata) 80 { 81 struct pcrypt_request *preq = pcrypt_padata_request(padata); 82 struct aead_request *req = pcrypt_request_ctx(preq); 83 84 padata->info = crypto_aead_encrypt(req); 85 86 if (padata->info == -EINPROGRESS) 87 return; 88 89 padata_do_serial(padata); 90 } 91 92 static int pcrypt_aead_encrypt(struct aead_request *req) 93 { 94 int err; 95 struct pcrypt_request *preq = aead_request_ctx(req); 96 struct aead_request *creq = pcrypt_request_ctx(preq); 97 struct padata_priv *padata = pcrypt_request_padata(preq); 98 struct crypto_aead *aead = crypto_aead_reqtfm(req); 99 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead); 100 u32 flags = aead_request_flags(req); 101 struct pcrypt_instance_ctx *ictx; 102 103 ictx = pcrypt_tfm_ictx(aead); 104 105 memset(padata, 0, sizeof(struct padata_priv)); 106 107 padata->parallel = pcrypt_aead_enc; 108 padata->serial = pcrypt_aead_serial; 109 110 aead_request_set_tfm(creq, ctx->child); 111 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, 112 pcrypt_aead_done, req); 113 aead_request_set_crypt(creq, req->src, req->dst, 114 req->cryptlen, req->iv); 115 aead_request_set_ad(creq, req->assoclen); 116 117 err = padata_do_parallel(ictx->psenc, padata, &ctx->cb_cpu); 118 if (!err) 119 return -EINPROGRESS; 120 121 return err; 122 } 123 124 static void pcrypt_aead_dec(struct padata_priv *padata) 125 { 126 struct pcrypt_request *preq = pcrypt_padata_request(padata); 127 struct aead_request *req = pcrypt_request_ctx(preq); 128 129 padata->info = crypto_aead_decrypt(req); 130 131 if (padata->info == -EINPROGRESS) 132 return; 133 134 padata_do_serial(padata); 135 } 136 137 static int pcrypt_aead_decrypt(struct aead_request *req) 138 { 139 int err; 140 struct pcrypt_request *preq = aead_request_ctx(req); 141 struct aead_request *creq = pcrypt_request_ctx(preq); 142 struct padata_priv *padata = pcrypt_request_padata(preq); 143 struct crypto_aead *aead = crypto_aead_reqtfm(req); 144 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead); 145 u32 flags = aead_request_flags(req); 146 struct pcrypt_instance_ctx *ictx; 147 148 ictx = pcrypt_tfm_ictx(aead); 149 150 memset(padata, 0, sizeof(struct padata_priv)); 151 152 padata->parallel = pcrypt_aead_dec; 153 padata->serial = pcrypt_aead_serial; 154 155 aead_request_set_tfm(creq, ctx->child); 156 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, 157 pcrypt_aead_done, req); 158 aead_request_set_crypt(creq, req->src, req->dst, 159 req->cryptlen, req->iv); 160 aead_request_set_ad(creq, req->assoclen); 161 162 err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu); 163 if (!err) 164 return -EINPROGRESS; 165 166 return err; 167 } 168 169 static int pcrypt_aead_init_tfm(struct crypto_aead *tfm) 170 { 171 int cpu, cpu_index; 172 struct aead_instance *inst = aead_alg_instance(tfm); 173 struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst); 174 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm); 175 struct crypto_aead *cipher; 176 177 cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) % 178 cpumask_weight(cpu_online_mask); 179 180 ctx->cb_cpu = cpumask_first(cpu_online_mask); 181 for (cpu = 0; cpu < cpu_index; cpu++) 182 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask); 183 184 cipher = crypto_spawn_aead(&ictx->spawn); 185 186 if (IS_ERR(cipher)) 187 return PTR_ERR(cipher); 188 189 ctx->child = cipher; 190 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) + 191 sizeof(struct aead_request) + 192 crypto_aead_reqsize(cipher)); 193 194 return 0; 195 } 196 197 static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm) 198 { 199 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm); 200 201 crypto_free_aead(ctx->child); 202 } 203 204 static void pcrypt_free(struct aead_instance *inst) 205 { 206 struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst); 207 208 crypto_drop_aead(&ctx->spawn); 209 padata_free_shell(ctx->psdec); 210 padata_free_shell(ctx->psenc); 211 kfree(inst); 212 } 213 214 static int pcrypt_init_instance(struct crypto_instance *inst, 215 struct crypto_alg *alg) 216 { 217 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, 218 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 219 return -ENAMETOOLONG; 220 221 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); 222 223 inst->alg.cra_priority = alg->cra_priority + 100; 224 inst->alg.cra_blocksize = alg->cra_blocksize; 225 inst->alg.cra_alignmask = alg->cra_alignmask; 226 227 return 0; 228 } 229 230 static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb, 231 u32 type, u32 mask) 232 { 233 struct pcrypt_instance_ctx *ctx; 234 struct crypto_attr_type *algt; 235 struct aead_instance *inst; 236 struct aead_alg *alg; 237 const char *name; 238 int err; 239 240 algt = crypto_get_attr_type(tb); 241 if (IS_ERR(algt)) 242 return PTR_ERR(algt); 243 244 name = crypto_attr_alg_name(tb[1]); 245 if (IS_ERR(name)) 246 return PTR_ERR(name); 247 248 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); 249 if (!inst) 250 return -ENOMEM; 251 252 err = -ENOMEM; 253 254 ctx = aead_instance_ctx(inst); 255 ctx->psenc = padata_alloc_shell(pencrypt); 256 if (!ctx->psenc) 257 goto out_free_inst; 258 259 ctx->psdec = padata_alloc_shell(pdecrypt); 260 if (!ctx->psdec) 261 goto out_free_psenc; 262 263 crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst)); 264 265 err = crypto_grab_aead(&ctx->spawn, name, 0, 0); 266 if (err) 267 goto out_free_psdec; 268 269 alg = crypto_spawn_aead_alg(&ctx->spawn); 270 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base); 271 if (err) 272 goto out_drop_aead; 273 274 inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC; 275 276 inst->alg.ivsize = crypto_aead_alg_ivsize(alg); 277 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); 278 279 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx); 280 281 inst->alg.init = pcrypt_aead_init_tfm; 282 inst->alg.exit = pcrypt_aead_exit_tfm; 283 284 inst->alg.setkey = pcrypt_aead_setkey; 285 inst->alg.setauthsize = pcrypt_aead_setauthsize; 286 inst->alg.encrypt = pcrypt_aead_encrypt; 287 inst->alg.decrypt = pcrypt_aead_decrypt; 288 289 inst->free = pcrypt_free; 290 291 err = aead_register_instance(tmpl, inst); 292 if (err) 293 goto out_drop_aead; 294 295 out: 296 return err; 297 298 out_drop_aead: 299 crypto_drop_aead(&ctx->spawn); 300 out_free_psdec: 301 padata_free_shell(ctx->psdec); 302 out_free_psenc: 303 padata_free_shell(ctx->psenc); 304 out_free_inst: 305 kfree(inst); 306 goto out; 307 } 308 309 static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb) 310 { 311 struct crypto_attr_type *algt; 312 313 algt = crypto_get_attr_type(tb); 314 if (IS_ERR(algt)) 315 return PTR_ERR(algt); 316 317 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) { 318 case CRYPTO_ALG_TYPE_AEAD: 319 return pcrypt_create_aead(tmpl, tb, algt->type, algt->mask); 320 } 321 322 return -EINVAL; 323 } 324 325 static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name) 326 { 327 int ret; 328 329 pinst->kobj.kset = pcrypt_kset; 330 ret = kobject_add(&pinst->kobj, NULL, "%s", name); 331 if (!ret) 332 kobject_uevent(&pinst->kobj, KOBJ_ADD); 333 334 return ret; 335 } 336 337 static int pcrypt_init_padata(struct padata_instance **pinst, const char *name) 338 { 339 int ret = -ENOMEM; 340 341 *pinst = padata_alloc_possible(name); 342 if (!*pinst) 343 return ret; 344 345 ret = pcrypt_sysfs_add(*pinst, name); 346 if (ret) 347 padata_free(*pinst); 348 349 return ret; 350 } 351 352 static void pcrypt_fini_padata(struct padata_instance *pinst) 353 { 354 padata_stop(pinst); 355 padata_free(pinst); 356 } 357 358 static struct crypto_template pcrypt_tmpl = { 359 .name = "pcrypt", 360 .create = pcrypt_create, 361 .module = THIS_MODULE, 362 }; 363 364 static int __init pcrypt_init(void) 365 { 366 int err = -ENOMEM; 367 368 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj); 369 if (!pcrypt_kset) 370 goto err; 371 372 err = pcrypt_init_padata(&pencrypt, "pencrypt"); 373 if (err) 374 goto err_unreg_kset; 375 376 err = pcrypt_init_padata(&pdecrypt, "pdecrypt"); 377 if (err) 378 goto err_deinit_pencrypt; 379 380 padata_start(pencrypt); 381 padata_start(pdecrypt); 382 383 return crypto_register_template(&pcrypt_tmpl); 384 385 err_deinit_pencrypt: 386 pcrypt_fini_padata(pencrypt); 387 err_unreg_kset: 388 kset_unregister(pcrypt_kset); 389 err: 390 return err; 391 } 392 393 static void __exit pcrypt_exit(void) 394 { 395 crypto_unregister_template(&pcrypt_tmpl); 396 397 pcrypt_fini_padata(pencrypt); 398 pcrypt_fini_padata(pdecrypt); 399 400 kset_unregister(pcrypt_kset); 401 } 402 403 subsys_initcall(pcrypt_init); 404 module_exit(pcrypt_exit); 405 406 MODULE_LICENSE("GPL"); 407 MODULE_AUTHOR("Steffen Klassert <[email protected]>"); 408 MODULE_DESCRIPTION("Parallel crypto wrapper"); 409 MODULE_ALIAS_CRYPTO("pcrypt"); 410