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                 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");