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