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(void *data, int err) 67 { 68 struct aead_request *req = data; 69 struct pcrypt_request *preq = aead_request_ctx(req); 70 struct padata_priv *padata = pcrypt_request_padata(preq); 71 72 if (err == -EINPROGRESS) 73 return; 74 75 padata->info = err; 76 77 padata_do_serial(padata); 78 } 79 80 static void pcrypt_aead_enc(struct padata_priv *padata) 81 { 82 struct pcrypt_request *preq = pcrypt_padata_request(padata); 83 struct aead_request *req = pcrypt_request_ctx(preq); 84 int ret; 85 86 ret = crypto_aead_encrypt(req); 87 88 if (ret == -EINPROGRESS || ret == -EBUSY) 89 return; 90 91 padata->info = ret; 92 padata_do_serial(padata); 93 } 94 95 static int pcrypt_aead_encrypt(struct aead_request *req) 96 { 97 int err; 98 struct pcrypt_request *preq = aead_request_ctx(req); 99 struct aead_request *creq = pcrypt_request_ctx(preq); 100 struct padata_priv *padata = pcrypt_request_padata(preq); 101 struct crypto_aead *aead = crypto_aead_reqtfm(req); 102 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead); 103 u32 flags = aead_request_flags(req); 104 struct pcrypt_instance_ctx *ictx; 105 106 ictx = pcrypt_tfm_ictx(aead); 107 108 memset(padata, 0, sizeof(struct padata_priv)); 109 110 padata->parallel = pcrypt_aead_enc; 111 padata->serial = pcrypt_aead_serial; 112 113 aead_request_set_tfm(creq, ctx->child); 114 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, 115 pcrypt_aead_done, req); 116 aead_request_set_crypt(creq, req->src, req->dst, 117 req->cryptlen, req->iv); 118 aead_request_set_ad(creq, req->assoclen); 119 120 err = padata_do_parallel(ictx->psenc, padata, &ctx->cb_cpu); 121 if (!err) 122 return -EINPROGRESS; 123 if (err == -EBUSY) { 124 /* try non-parallel mode */ 125 aead_request_set_callback(creq, flags, req->base.complete, 126 req->base.data); 127 return crypto_aead_encrypt(creq); 128 } 129 130 return err; 131 } 132 133 static void pcrypt_aead_dec(struct padata_priv *padata) 134 { 135 struct pcrypt_request *preq = pcrypt_padata_request(padata); 136 struct aead_request *req = pcrypt_request_ctx(preq); 137 int ret; 138 139 ret = crypto_aead_decrypt(req); 140 141 if (ret == -EINPROGRESS || ret == -EBUSY) 142 return; 143 144 padata->info = ret; 145 padata_do_serial(padata); 146 } 147 148 static int pcrypt_aead_decrypt(struct aead_request *req) 149 { 150 int err; 151 struct pcrypt_request *preq = aead_request_ctx(req); 152 struct aead_request *creq = pcrypt_request_ctx(preq); 153 struct padata_priv *padata = pcrypt_request_padata(preq); 154 struct crypto_aead *aead = crypto_aead_reqtfm(req); 155 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead); 156 u32 flags = aead_request_flags(req); 157 struct pcrypt_instance_ctx *ictx; 158 159 ictx = pcrypt_tfm_ictx(aead); 160 161 memset(padata, 0, sizeof(struct padata_priv)); 162 163 padata->parallel = pcrypt_aead_dec; 164 padata->serial = pcrypt_aead_serial; 165 166 aead_request_set_tfm(creq, ctx->child); 167 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, 168 pcrypt_aead_done, req); 169 aead_request_set_crypt(creq, req->src, req->dst, 170 req->cryptlen, req->iv); 171 aead_request_set_ad(creq, req->assoclen); 172 173 err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu); 174 if (!err) 175 return -EINPROGRESS; 176 if (err == -EBUSY) { 177 /* try non-parallel mode */ 178 aead_request_set_callback(creq, flags, req->base.complete, 179 req->base.data); 180 return crypto_aead_decrypt(creq); 181 } 182 183 return err; 184 } 185 186 static int pcrypt_aead_init_tfm(struct crypto_aead *tfm) 187 { 188 int cpu_index; 189 struct aead_instance *inst = aead_alg_instance(tfm); 190 struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst); 191 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm); 192 struct crypto_aead *cipher; 193 194 cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) % 195 cpumask_weight(cpu_online_mask); 196 197 ctx->cb_cpu = cpumask_nth(cpu_index, cpu_online_mask); 198 cipher = crypto_spawn_aead(&ictx->spawn); 199 200 if (IS_ERR(cipher)) 201 return PTR_ERR(cipher); 202 203 ctx->child = cipher; 204 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) + 205 sizeof(struct aead_request) + 206 crypto_aead_reqsize(cipher)); 207 208 return 0; 209 } 210 211 static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm) 212 { 213 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm); 214 215 crypto_free_aead(ctx->child); 216 } 217 218 static void pcrypt_free(struct aead_instance *inst) 219 { 220 struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst); 221 222 crypto_drop_aead(&ctx->spawn); 223 padata_free_shell(ctx->psdec); 224 padata_free_shell(ctx->psenc); 225 kfree(inst); 226 } 227 228 static int pcrypt_init_instance(struct crypto_instance *inst, 229 struct crypto_alg *alg) 230 { 231 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, 232 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 233 return -ENAMETOOLONG; 234 235 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); 236 237 inst->alg.cra_priority = alg->cra_priority + 100; 238 inst->alg.cra_blocksize = alg->cra_blocksize; 239 inst->alg.cra_alignmask = alg->cra_alignmask; 240 241 return 0; 242 } 243 244 static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb, 245 struct crypto_attr_type *algt) 246 { 247 struct pcrypt_instance_ctx *ctx; 248 struct aead_instance *inst; 249 struct aead_alg *alg; 250 u32 mask = crypto_algt_inherited_mask(algt); 251 int err; 252 253 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); 254 if (!inst) 255 return -ENOMEM; 256 257 err = -ENOMEM; 258 259 ctx = aead_instance_ctx(inst); 260 ctx->psenc = padata_alloc_shell(pencrypt); 261 if (!ctx->psenc) 262 goto err_free_inst; 263 264 ctx->psdec = padata_alloc_shell(pdecrypt); 265 if (!ctx->psdec) 266 goto err_free_inst; 267 268 err = crypto_grab_aead(&ctx->spawn, aead_crypto_instance(inst), 269 crypto_attr_alg_name(tb[1]), 0, mask); 270 if (err) 271 goto err_free_inst; 272 273 alg = crypto_spawn_aead_alg(&ctx->spawn); 274 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base); 275 if (err) 276 goto err_free_inst; 277 278 inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC; 279 280 inst->alg.ivsize = crypto_aead_alg_ivsize(alg); 281 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); 282 283 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx); 284 285 inst->alg.init = pcrypt_aead_init_tfm; 286 inst->alg.exit = pcrypt_aead_exit_tfm; 287 288 inst->alg.setkey = pcrypt_aead_setkey; 289 inst->alg.setauthsize = pcrypt_aead_setauthsize; 290 inst->alg.encrypt = pcrypt_aead_encrypt; 291 inst->alg.decrypt = pcrypt_aead_decrypt; 292 293 inst->free = pcrypt_free; 294 295 err = aead_register_instance(tmpl, inst); 296 if (err) { 297 err_free_inst: 298 pcrypt_free(inst); 299 } 300 return err; 301 } 302 303 static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb) 304 { 305 struct crypto_attr_type *algt; 306 307 algt = crypto_get_attr_type(tb); 308 if (IS_ERR(algt)) 309 return PTR_ERR(algt); 310 311 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) { 312 case CRYPTO_ALG_TYPE_AEAD: 313 return pcrypt_create_aead(tmpl, tb, algt); 314 } 315 316 return -EINVAL; 317 } 318 319 static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name) 320 { 321 int ret; 322 323 pinst->kobj.kset = pcrypt_kset; 324 ret = kobject_add(&pinst->kobj, NULL, "%s", name); 325 if (!ret) 326 kobject_uevent(&pinst->kobj, KOBJ_ADD); 327 328 return ret; 329 } 330 331 static int pcrypt_init_padata(struct padata_instance **pinst, const char *name) 332 { 333 int ret = -ENOMEM; 334 335 *pinst = padata_alloc(name); 336 if (!*pinst) 337 return ret; 338 339 ret = pcrypt_sysfs_add(*pinst, name); 340 if (ret) 341 padata_free(*pinst); 342 343 return ret; 344 } 345 346 static struct crypto_template pcrypt_tmpl = { 347 .name = "pcrypt", 348 .create = pcrypt_create, 349 .module = THIS_MODULE, 350 }; 351 352 static int __init pcrypt_init(void) 353 { 354 int err = -ENOMEM; 355 356 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj); 357 if (!pcrypt_kset) 358 goto err; 359 360 err = pcrypt_init_padata(&pencrypt, "pencrypt"); 361 if (err) 362 goto err_unreg_kset; 363 364 err = pcrypt_init_padata(&pdecrypt, "pdecrypt"); 365 if (err) 366 goto err_deinit_pencrypt; 367 368 return crypto_register_template(&pcrypt_tmpl); 369 370 err_deinit_pencrypt: 371 padata_free(pencrypt); 372 err_unreg_kset: 373 kset_unregister(pcrypt_kset); 374 err: 375 return err; 376 } 377 378 static void __exit pcrypt_exit(void) 379 { 380 crypto_unregister_template(&pcrypt_tmpl); 381 382 padata_free(pencrypt); 383 padata_free(pdecrypt); 384 385 kset_unregister(pcrypt_kset); 386 } 387 388 module_init(pcrypt_init); 389 module_exit(pcrypt_exit); 390 391 MODULE_LICENSE("GPL"); 392 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); 393 MODULE_DESCRIPTION("Parallel crypto wrapper"); 394 MODULE_ALIAS_CRYPTO("pcrypt"); 395