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