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