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(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                 /* try non-parallel mode */
 122                 return crypto_aead_encrypt(creq);
 123         }
 124
 125         return err;
 126 }
 127
 128 static void pcrypt_aead_dec(struct padata_priv *padata)
 129 {
 130         struct pcrypt_request *preq = pcrypt_padata_request(padata);
 131         struct aead_request *req = pcrypt_request_ctx(preq);
 132         int ret;
 133
 134         ret = crypto_aead_decrypt(req);
 135
 136         if (ret == -EINPROGRESS)
 137                 return;
 138
 139         padata->info = ret;
 140         padata_do_serial(padata);
 141 }
 142
 143 static int pcrypt_aead_decrypt(struct aead_request *req)
 144 {
 145         int err;
 146         struct pcrypt_request *preq = aead_request_ctx(req);
 147         struct aead_request *creq = pcrypt_request_ctx(preq);
 148         struct padata_priv *padata = pcrypt_request_padata(preq);
 149         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 150         struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
 151         u32 flags = aead_request_flags(req);
 152         struct pcrypt_instance_ctx *ictx;
 153
 154         ictx = pcrypt_tfm_ictx(aead);
 155
 156         memset(padata, 0, sizeof(struct padata_priv));
 157
 158         padata->parallel = pcrypt_aead_dec;
 159         padata->serial = pcrypt_aead_serial;
 160
 161         aead_request_set_tfm(creq, ctx->child);
 162         aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
 163                                   pcrypt_aead_done, req);
 164         aead_request_set_crypt(creq, req->src, req->dst,
 165                                req->cryptlen, req->iv);
 166         aead_request_set_ad(creq, req->assoclen);
 167
 168         err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu);
 169         if (!err)
 170                 return -EINPROGRESS;
 171         if (err == -EBUSY) {
 172                 /* try non-parallel mode */
 173                 return crypto_aead_decrypt(creq);
 174         }
 175
 176         return err;
 177 }
 178
 179 static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
 180 {
 181         int cpu, cpu_index;
 182         struct aead_instance *inst = aead_alg_instance(tfm);
 183         struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
 184         struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
 185         struct crypto_aead *cipher;
 186
 187         cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
 188                     cpumask_weight(cpu_online_mask);
 189
 190         ctx->cb_cpu = cpumask_first(cpu_online_mask);
 191         for (cpu = 0; cpu < cpu_index; cpu++)
 192                 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
 193
 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 subsys_initcall(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");