crypto/pcrypt.c

   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         const char *name;
 236         int err;
 237
 238         algt = crypto_get_attr_type(tb);
 239         if (IS_ERR(algt))
 240                 return PTR_ERR(algt);
 241
 242         name = crypto_attr_alg_name(tb[1]);
 243         if (IS_ERR(name))
 244                 return PTR_ERR(name);
 245
 246         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 247         if (!inst)
 248                 return -ENOMEM;
 249
 250         err = -ENOMEM;
 251
 252         ctx = aead_instance_ctx(inst);
 253         ctx->psenc = padata_alloc_shell(pencrypt);
 254         if (!ctx->psenc)
 255                 goto out_free_inst;
 256
 257         ctx->psdec = padata_alloc_shell(pdecrypt);
 258         if (!ctx->psdec)
 259                 goto out_free_psenc;
 260
 261         err = crypto_grab_aead(&ctx->spawn, aead_crypto_instance(inst),
 262                                name, 0, 0);
 263         if (err)
 264                 goto out_free_psdec;
 265
 266         alg = crypto_spawn_aead_alg(&ctx->spawn);
 267         err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
 268         if (err)
 269                 goto out_drop_aead;
 270
 271         inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC;
 272
 273         inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
 274         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
 275
 276         inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
 277
 278         inst->alg.init = pcrypt_aead_init_tfm;
 279         inst->alg.exit = pcrypt_aead_exit_tfm;
 280
 281         inst->alg.setkey = pcrypt_aead_setkey;
 282         inst->alg.setauthsize = pcrypt_aead_setauthsize;
 283         inst->alg.encrypt = pcrypt_aead_encrypt;
 284         inst->alg.decrypt = pcrypt_aead_decrypt;
 285
 286         inst->free = pcrypt_free;
 287
 288         err = aead_register_instance(tmpl, inst);
 289         if (err)
 290                 goto out_drop_aead;
 291
 292 out:
 293         return err;
 294
 295 out_drop_aead:
 296         crypto_drop_aead(&ctx->spawn);
 297 out_free_psdec:
 298         padata_free_shell(ctx->psdec);
 299 out_free_psenc:
 300         padata_free_shell(ctx->psenc);
 301 out_free_inst:
 302         kfree(inst);
 303         goto out;
 304 }
 305
 306 static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
 307 {
 308         struct crypto_attr_type *algt;
 309
 310         algt = crypto_get_attr_type(tb);
 311         if (IS_ERR(algt))
 312                 return PTR_ERR(algt);
 313
 314         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 315         case CRYPTO_ALG_TYPE_AEAD:
 316                 return pcrypt_create_aead(tmpl, tb, algt->type, algt->mask);
 317         }
 318
 319         return -EINVAL;
 320 }
 321
 322 static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
 323 {
 324         int ret;
 325
 326         pinst->kobj.kset = pcrypt_kset;
 327         ret = kobject_add(&pinst->kobj, NULL, "%s", name);
 328         if (!ret)
 329                 kobject_uevent(&pinst->kobj, KOBJ_ADD);
 330
 331         return ret;
 332 }
 333
 334 static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)
 335 {
 336         int ret = -ENOMEM;
 337
 338         *pinst = padata_alloc_possible(name);
 339         if (!*pinst)
 340                 return ret;
 341
 342         ret = pcrypt_sysfs_add(*pinst, name);
 343         if (ret)
 344                 padata_free(*pinst);
 345
 346         return ret;
 347 }
 348
 349 static void pcrypt_fini_padata(struct padata_instance *pinst)
 350 {
 351         padata_stop(pinst);
 352         padata_free(pinst);
 353 }
 354
 355 static struct crypto_template pcrypt_tmpl = {
 356         .name = "pcrypt",
 357         .create = pcrypt_create,
 358         .module = THIS_MODULE,
 359 };
 360
 361 static int __init pcrypt_init(void)
 362 {
 363         int err = -ENOMEM;
 364
 365         pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
 366         if (!pcrypt_kset)
 367                 goto err;
 368
 369         err = pcrypt_init_padata(&pencrypt, "pencrypt");
 370         if (err)
 371                 goto err_unreg_kset;
 372
 373         err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
 374         if (err)
 375                 goto err_deinit_pencrypt;
 376
 377         padata_start(pencrypt);
 378         padata_start(pdecrypt);
 379
 380         return crypto_register_template(&pcrypt_tmpl);
 381
 382 err_deinit_pencrypt:
 383         pcrypt_fini_padata(pencrypt);
 384 err_unreg_kset:
 385         kset_unregister(pcrypt_kset);
 386 err:
 387         return err;
 388 }
 389
 390 static void __exit pcrypt_exit(void)
 391 {
 392         crypto_unregister_template(&pcrypt_tmpl);
 393
 394         pcrypt_fini_padata(pencrypt);
 395         pcrypt_fini_padata(pdecrypt);
 396
 397         kset_unregister(pcrypt_kset);
 398 }
 399
 400 subsys_initcall(pcrypt_init);
 401 module_exit(pcrypt_exit);
 402
 403 MODULE_LICENSE("GPL");
 404 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
 405 MODULE_DESCRIPTION("Parallel crypto wrapper");
 406 MODULE_ALIAS_CRYPTO("pcrypt");