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