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/notifier.h>
  17 #include <linux/kobject.h>
  18 #include <linux/cpu.h>
  19 #include <crypto/pcrypt.h>
  20
  21 static struct padata_instance *pencrypt;
  22 static struct padata_instance *pdecrypt;
  23 static struct kset           *pcrypt_kset;
  24
  25 struct pcrypt_instance_ctx {
  26         struct crypto_aead_spawn spawn;
  27         atomic_t tfm_count;
  28 };
  29
  30 struct pcrypt_aead_ctx {
  31         struct crypto_aead *child;
  32         unsigned int cb_cpu;
  33 };
  34
  35 static int pcrypt_aead_setkey(struct crypto_aead *parent,
  36                               const u8 *key, unsigned int keylen)
  37 {
  38         struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
  39
  40         return crypto_aead_setkey(ctx->child, key, keylen);
  41 }
  42
  43 static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
  44                                    unsigned int authsize)
  45 {
  46         struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
  47
  48         return crypto_aead_setauthsize(ctx->child, authsize);
  49 }
  50
  51 static void pcrypt_aead_serial(struct padata_priv *padata)
  52 {
  53         struct pcrypt_request *preq = pcrypt_padata_request(padata);
  54         struct aead_request *req = pcrypt_request_ctx(preq);
  55
  56         aead_request_complete(req->base.data, padata->info);
  57 }
  58
  59 static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
  60 {
  61         struct aead_request *req = areq->data;
  62         struct pcrypt_request *preq = aead_request_ctx(req);
  63         struct padata_priv *padata = pcrypt_request_padata(preq);
  64
  65         padata->info = err;
  66         req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
  67
  68         padata_do_serial(padata);
  69 }
  70
  71 static void pcrypt_aead_enc(struct padata_priv *padata)
  72 {
  73         struct pcrypt_request *preq = pcrypt_padata_request(padata);
  74         struct aead_request *req = pcrypt_request_ctx(preq);
  75
  76         padata->info = crypto_aead_encrypt(req);
  77
  78         if (padata->info == -EINPROGRESS)
  79                 return;
  80
  81         padata_do_serial(padata);
  82 }
  83
  84 static int pcrypt_aead_encrypt(struct aead_request *req)
  85 {
  86         int err;
  87         struct pcrypt_request *preq = aead_request_ctx(req);
  88         struct aead_request *creq = pcrypt_request_ctx(preq);
  89         struct padata_priv *padata = pcrypt_request_padata(preq);
  90         struct crypto_aead *aead = crypto_aead_reqtfm(req);
  91         struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
  92         u32 flags = aead_request_flags(req);
  93
  94         memset(padata, 0, sizeof(struct padata_priv));
  95
  96         padata->parallel = pcrypt_aead_enc;
  97         padata->serial = pcrypt_aead_serial;
  98
  99         aead_request_set_tfm(creq, ctx->child);
 100         aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
 101                                   pcrypt_aead_done, req);
 102         aead_request_set_crypt(creq, req->src, req->dst,
 103                                req->cryptlen, req->iv);
 104         aead_request_set_ad(creq, req->assoclen);
 105
 106         err = padata_do_parallel(pencrypt, padata, &ctx->cb_cpu);
 107         if (!err)
 108                 return -EINPROGRESS;
 109
 110         return err;
 111 }
 112
 113 static void pcrypt_aead_dec(struct padata_priv *padata)
 114 {
 115         struct pcrypt_request *preq = pcrypt_padata_request(padata);
 116         struct aead_request *req = pcrypt_request_ctx(preq);
 117
 118         padata->info = crypto_aead_decrypt(req);
 119
 120         if (padata->info == -EINPROGRESS)
 121                 return;
 122
 123         padata_do_serial(padata);
 124 }
 125
 126 static int pcrypt_aead_decrypt(struct aead_request *req)
 127 {
 128         int err;
 129         struct pcrypt_request *preq = aead_request_ctx(req);
 130         struct aead_request *creq = pcrypt_request_ctx(preq);
 131         struct padata_priv *padata = pcrypt_request_padata(preq);
 132         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 133         struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
 134         u32 flags = aead_request_flags(req);
 135
 136         memset(padata, 0, sizeof(struct padata_priv));
 137
 138         padata->parallel = pcrypt_aead_dec;
 139         padata->serial = pcrypt_aead_serial;
 140
 141         aead_request_set_tfm(creq, ctx->child);
 142         aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
 143                                   pcrypt_aead_done, req);
 144         aead_request_set_crypt(creq, req->src, req->dst,
 145                                req->cryptlen, req->iv);
 146         aead_request_set_ad(creq, req->assoclen);
 147
 148         err = padata_do_parallel(pdecrypt, padata, &ctx->cb_cpu);
 149         if (!err)
 150                 return -EINPROGRESS;
 151
 152         return err;
 153 }
 154
 155 static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
 156 {
 157         int cpu, cpu_index;
 158         struct aead_instance *inst = aead_alg_instance(tfm);
 159         struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
 160         struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
 161         struct crypto_aead *cipher;
 162
 163         cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
 164                     cpumask_weight(cpu_online_mask);
 165
 166         ctx->cb_cpu = cpumask_first(cpu_online_mask);
 167         for (cpu = 0; cpu < cpu_index; cpu++)
 168                 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
 169
 170         cipher = crypto_spawn_aead(&ictx->spawn);
 171
 172         if (IS_ERR(cipher))
 173                 return PTR_ERR(cipher);
 174
 175         ctx->child = cipher;
 176         crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
 177                                      sizeof(struct aead_request) +
 178                                      crypto_aead_reqsize(cipher));
 179
 180         return 0;
 181 }
 182
 183 static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
 184 {
 185         struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
 186
 187         crypto_free_aead(ctx->child);
 188 }
 189
 190 static void pcrypt_free(struct aead_instance *inst)
 191 {
 192         struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);
 193
 194         crypto_drop_aead(&ctx->spawn);
 195         kfree(inst);
 196 }
 197
 198 static int pcrypt_init_instance(struct crypto_instance *inst,
 199                                 struct crypto_alg *alg)
 200 {
 201         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 202                      "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 203                 return -ENAMETOOLONG;
 204
 205         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 206
 207         inst->alg.cra_priority = alg->cra_priority + 100;
 208         inst->alg.cra_blocksize = alg->cra_blocksize;
 209         inst->alg.cra_alignmask = alg->cra_alignmask;
 210
 211         return 0;
 212 }
 213
 214 static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
 215                               u32 type, u32 mask)
 216 {
 217         struct pcrypt_instance_ctx *ctx;
 218         struct crypto_attr_type *algt;
 219         struct aead_instance *inst;
 220         struct aead_alg *alg;
 221         const char *name;
 222         int err;
 223
 224         algt = crypto_get_attr_type(tb);
 225         if (IS_ERR(algt))
 226                 return PTR_ERR(algt);
 227
 228         name = crypto_attr_alg_name(tb[1]);
 229         if (IS_ERR(name))
 230                 return PTR_ERR(name);
 231
 232         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 233         if (!inst)
 234                 return -ENOMEM;
 235
 236         ctx = aead_instance_ctx(inst);
 237         crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst));
 238
 239         err = crypto_grab_aead(&ctx->spawn, name, 0, 0);
 240         if (err)
 241                 goto out_free_inst;
 242
 243         alg = crypto_spawn_aead_alg(&ctx->spawn);
 244         err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
 245         if (err)
 246                 goto out_drop_aead;
 247
 248         inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC;
 249
 250         inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
 251         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
 252
 253         inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
 254
 255         inst->alg.init = pcrypt_aead_init_tfm;
 256         inst->alg.exit = pcrypt_aead_exit_tfm;
 257
 258         inst->alg.setkey = pcrypt_aead_setkey;
 259         inst->alg.setauthsize = pcrypt_aead_setauthsize;
 260         inst->alg.encrypt = pcrypt_aead_encrypt;
 261         inst->alg.decrypt = pcrypt_aead_decrypt;
 262
 263         inst->free = pcrypt_free;
 264
 265         err = aead_register_instance(tmpl, inst);
 266         if (err)
 267                 goto out_drop_aead;
 268
 269 out:
 270         return err;
 271
 272 out_drop_aead:
 273         crypto_drop_aead(&ctx->spawn);
 274 out_free_inst:
 275         kfree(inst);
 276         goto out;
 277 }
 278
 279 static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
 280 {
 281         struct crypto_attr_type *algt;
 282
 283         algt = crypto_get_attr_type(tb);
 284         if (IS_ERR(algt))
 285                 return PTR_ERR(algt);
 286
 287         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 288         case CRYPTO_ALG_TYPE_AEAD:
 289                 return pcrypt_create_aead(tmpl, tb, algt->type, algt->mask);
 290         }
 291
 292         return -EINVAL;
 293 }
 294
 295 static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
 296 {
 297         int ret;
 298
 299         pinst->kobj.kset = pcrypt_kset;
 300         ret = kobject_add(&pinst->kobj, NULL, "%s", name);
 301         if (!ret)
 302                 kobject_uevent(&pinst->kobj, KOBJ_ADD);
 303
 304         return ret;
 305 }
 306
 307 static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)
 308 {
 309         int ret = -ENOMEM;
 310
 311         *pinst = padata_alloc_possible(name);
 312         if (!*pinst)
 313                 return ret;
 314
 315         ret = pcrypt_sysfs_add(*pinst, name);
 316         if (ret)
 317                 padata_free(*pinst);
 318
 319         return ret;
 320 }
 321
 322 static void pcrypt_fini_padata(struct padata_instance *pinst)
 323 {
 324         padata_stop(pinst);
 325         padata_free(pinst);
 326 }
 327
 328 static struct crypto_template pcrypt_tmpl = {
 329         .name = "pcrypt",
 330         .create = pcrypt_create,
 331         .module = THIS_MODULE,
 332 };
 333
 334 static int __init pcrypt_init(void)
 335 {
 336         int err = -ENOMEM;
 337
 338         pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
 339         if (!pcrypt_kset)
 340                 goto err;
 341
 342         err = pcrypt_init_padata(&pencrypt, "pencrypt");
 343         if (err)
 344                 goto err_unreg_kset;
 345
 346         err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
 347         if (err)
 348                 goto err_deinit_pencrypt;
 349
 350         padata_start(pencrypt);
 351         padata_start(pdecrypt);
 352
 353         return crypto_register_template(&pcrypt_tmpl);
 354
 355 err_deinit_pencrypt:
 356         pcrypt_fini_padata(pencrypt);
 357 err_unreg_kset:
 358         kset_unregister(pcrypt_kset);
 359 err:
 360         return err;
 361 }
 362
 363 static void __exit pcrypt_exit(void)
 364 {
 365         pcrypt_fini_padata(pencrypt);
 366         pcrypt_fini_padata(pdecrypt);
 367
 368         kset_unregister(pcrypt_kset);
 369         crypto_unregister_template(&pcrypt_tmpl);
 370 }
 371
 372 subsys_initcall(pcrypt_init);
 373 module_exit(pcrypt_exit);
 374
 375 MODULE_LICENSE("GPL");
 376 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
 377 MODULE_DESCRIPTION("Parallel crypto wrapper");
 378 MODULE_ALIAS_CRYPTO("pcrypt");