2 * pcrypt - Parallel crypto wrapper.
4 * Copyright (C) 2009 secunet Security Networks AG
5 * Copyright (C) 2009 Steffen Klassert <steffen.klassert@secunet.com>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
21 #include <crypto/algapi.h>
22 #include <crypto/internal/aead.h>
23 #include <linux/atomic.h>
24 #include <linux/err.h>
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/notifier.h>
29 #include <linux/kobject.h>
30 #include <linux/cpu.h>
31 #include <crypto/pcrypt.h>
33 struct padata_pcrypt {
34 struct padata_instance *pinst;
35 struct workqueue_struct *wq;
38 * Cpumask for callback CPUs. It should be
39 * equal to serial cpumask of corresponding padata instance,
40 * so it is updated when padata notifies us about serial
43 * cb_cpumask is protected by RCU. This fact prevents us from
44 * using cpumask_var_t directly because the actual type of
45 * cpumsak_var_t depends on kernel configuration(particularly on
46 * CONFIG_CPUMASK_OFFSTACK macro). Depending on the configuration
47 * cpumask_var_t may be either a pointer to the struct cpumask
48 * or a variable allocated on the stack. Thus we can not safely use
49 * cpumask_var_t with RCU operations such as rcu_assign_pointer or
50 * rcu_dereference. So cpumask_var_t is wrapped with struct
51 * pcrypt_cpumask which makes possible to use it with RCU.
53 struct pcrypt_cpumask {
56 struct notifier_block nblock;
59 static struct padata_pcrypt pencrypt;
60 static struct padata_pcrypt pdecrypt;
61 static struct kset *pcrypt_kset;
63 struct pcrypt_instance_ctx {
64 struct crypto_aead_spawn spawn;
68 struct pcrypt_aead_ctx {
69 struct crypto_aead *child;
73 static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,
74 struct padata_pcrypt *pcrypt)
76 unsigned int cpu_index, cpu, i;
77 struct pcrypt_cpumask *cpumask;
82 cpumask = rcu_dereference_bh(pcrypt->cb_cpumask);
83 if (cpumask_test_cpu(cpu, cpumask->mask))
86 if (!cpumask_weight(cpumask->mask))
89 cpu_index = cpu % cpumask_weight(cpumask->mask);
91 cpu = cpumask_first(cpumask->mask);
92 for (i = 0; i < cpu_index; i++)
93 cpu = cpumask_next(cpu, cpumask->mask);
99 return padata_do_parallel(pcrypt->pinst, padata, cpu);
102 static int pcrypt_aead_setkey(struct crypto_aead *parent,
103 const u8 *key, unsigned int keylen)
105 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
107 return crypto_aead_setkey(ctx->child, key, keylen);
110 static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
111 unsigned int authsize)
113 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
115 return crypto_aead_setauthsize(ctx->child, authsize);
118 static void pcrypt_aead_serial(struct padata_priv *padata)
120 struct pcrypt_request *preq = pcrypt_padata_request(padata);
121 struct aead_request *req = pcrypt_request_ctx(preq);
123 aead_request_complete(req->base.data, padata->info);
126 static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
128 struct aead_request *req = areq->data;
129 struct pcrypt_request *preq = aead_request_ctx(req);
130 struct padata_priv *padata = pcrypt_request_padata(preq);
134 padata_do_serial(padata);
137 static void pcrypt_aead_enc(struct padata_priv *padata)
139 struct pcrypt_request *preq = pcrypt_padata_request(padata);
140 struct aead_request *req = pcrypt_request_ctx(preq);
142 padata->info = crypto_aead_encrypt(req);
144 if (padata->info == -EINPROGRESS)
147 padata_do_serial(padata);
150 static int pcrypt_aead_encrypt(struct aead_request *req)
153 struct pcrypt_request *preq = aead_request_ctx(req);
154 struct aead_request *creq = pcrypt_request_ctx(preq);
155 struct padata_priv *padata = pcrypt_request_padata(preq);
156 struct crypto_aead *aead = crypto_aead_reqtfm(req);
157 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
158 u32 flags = aead_request_flags(req);
160 memset(padata, 0, sizeof(struct padata_priv));
162 padata->parallel = pcrypt_aead_enc;
163 padata->serial = pcrypt_aead_serial;
165 aead_request_set_tfm(creq, ctx->child);
166 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
167 pcrypt_aead_done, req);
168 aead_request_set_crypt(creq, req->src, req->dst,
169 req->cryptlen, req->iv);
170 aead_request_set_ad(creq, req->assoclen);
172 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt);
179 static void pcrypt_aead_dec(struct padata_priv *padata)
181 struct pcrypt_request *preq = pcrypt_padata_request(padata);
182 struct aead_request *req = pcrypt_request_ctx(preq);
184 padata->info = crypto_aead_decrypt(req);
186 if (padata->info == -EINPROGRESS)
189 padata_do_serial(padata);
192 static int pcrypt_aead_decrypt(struct aead_request *req)
195 struct pcrypt_request *preq = aead_request_ctx(req);
196 struct aead_request *creq = pcrypt_request_ctx(preq);
197 struct padata_priv *padata = pcrypt_request_padata(preq);
198 struct crypto_aead *aead = crypto_aead_reqtfm(req);
199 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
200 u32 flags = aead_request_flags(req);
202 memset(padata, 0, sizeof(struct padata_priv));
204 padata->parallel = pcrypt_aead_dec;
205 padata->serial = pcrypt_aead_serial;
207 aead_request_set_tfm(creq, ctx->child);
208 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
209 pcrypt_aead_done, req);
210 aead_request_set_crypt(creq, req->src, req->dst,
211 req->cryptlen, req->iv);
212 aead_request_set_ad(creq, req->assoclen);
214 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pdecrypt);
221 static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
224 struct aead_instance *inst = aead_alg_instance(tfm);
225 struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
226 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
227 struct crypto_aead *cipher;
229 cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
230 cpumask_weight(cpu_online_mask);
232 ctx->cb_cpu = cpumask_first(cpu_online_mask);
233 for (cpu = 0; cpu < cpu_index; cpu++)
234 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
236 cipher = crypto_spawn_aead(&ictx->spawn);
239 return PTR_ERR(cipher);
242 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
243 sizeof(struct aead_request) +
244 crypto_aead_reqsize(cipher));
249 static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
251 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
253 crypto_free_aead(ctx->child);
256 static void pcrypt_free(struct aead_instance *inst)
258 struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);
260 crypto_drop_aead(&ctx->spawn);
264 static int pcrypt_init_instance(struct crypto_instance *inst,
265 struct crypto_alg *alg)
267 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
268 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
269 return -ENAMETOOLONG;
271 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
273 inst->alg.cra_priority = alg->cra_priority + 100;
274 inst->alg.cra_blocksize = alg->cra_blocksize;
275 inst->alg.cra_alignmask = alg->cra_alignmask;
280 static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
283 struct pcrypt_instance_ctx *ctx;
284 struct crypto_attr_type *algt;
285 struct aead_instance *inst;
286 struct aead_alg *alg;
290 algt = crypto_get_attr_type(tb);
292 return PTR_ERR(algt);
294 name = crypto_attr_alg_name(tb[1]);
296 return PTR_ERR(name);
298 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
302 ctx = aead_instance_ctx(inst);
303 crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst));
305 err = crypto_grab_aead(&ctx->spawn, name, 0, 0);
309 alg = crypto_spawn_aead_alg(&ctx->spawn);
310 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
314 inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC;
316 inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
317 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
319 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
321 inst->alg.init = pcrypt_aead_init_tfm;
322 inst->alg.exit = pcrypt_aead_exit_tfm;
324 inst->alg.setkey = pcrypt_aead_setkey;
325 inst->alg.setauthsize = pcrypt_aead_setauthsize;
326 inst->alg.encrypt = pcrypt_aead_encrypt;
327 inst->alg.decrypt = pcrypt_aead_decrypt;
329 inst->free = pcrypt_free;
331 err = aead_register_instance(tmpl, inst);
339 crypto_drop_aead(&ctx->spawn);
345 static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
347 struct crypto_attr_type *algt;
349 algt = crypto_get_attr_type(tb);
351 return PTR_ERR(algt);
353 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
354 case CRYPTO_ALG_TYPE_AEAD:
355 return pcrypt_create_aead(tmpl, tb, algt->type, algt->mask);
361 static int pcrypt_cpumask_change_notify(struct notifier_block *self,
362 unsigned long val, void *data)
364 struct padata_pcrypt *pcrypt;
365 struct pcrypt_cpumask *new_mask, *old_mask;
366 struct padata_cpumask *cpumask = (struct padata_cpumask *)data;
368 if (!(val & PADATA_CPU_SERIAL))
371 pcrypt = container_of(self, struct padata_pcrypt, nblock);
372 new_mask = kmalloc(sizeof(*new_mask), GFP_KERNEL);
375 if (!alloc_cpumask_var(&new_mask->mask, GFP_KERNEL)) {
380 old_mask = pcrypt->cb_cpumask;
382 cpumask_copy(new_mask->mask, cpumask->cbcpu);
383 rcu_assign_pointer(pcrypt->cb_cpumask, new_mask);
384 synchronize_rcu_bh();
386 free_cpumask_var(old_mask->mask);
391 static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
395 pinst->kobj.kset = pcrypt_kset;
396 ret = kobject_add(&pinst->kobj, NULL, "%s", name);
398 kobject_uevent(&pinst->kobj, KOBJ_ADD);
403 static int pcrypt_init_padata(struct padata_pcrypt *pcrypt,
407 struct pcrypt_cpumask *mask;
411 pcrypt->wq = alloc_workqueue("%s", WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE,
416 pcrypt->pinst = padata_alloc_possible(pcrypt->wq);
418 goto err_destroy_workqueue;
420 mask = kmalloc(sizeof(*mask), GFP_KERNEL);
422 goto err_free_padata;
423 if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) {
425 goto err_free_padata;
428 cpumask_and(mask->mask, cpu_possible_mask, cpu_online_mask);
429 rcu_assign_pointer(pcrypt->cb_cpumask, mask);
431 pcrypt->nblock.notifier_call = pcrypt_cpumask_change_notify;
432 ret = padata_register_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
434 goto err_free_cpumask;
436 ret = pcrypt_sysfs_add(pcrypt->pinst, name);
438 goto err_unregister_notifier;
444 err_unregister_notifier:
445 padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
447 free_cpumask_var(mask->mask);
450 padata_free(pcrypt->pinst);
451 err_destroy_workqueue:
452 destroy_workqueue(pcrypt->wq);
459 static void pcrypt_fini_padata(struct padata_pcrypt *pcrypt)
461 free_cpumask_var(pcrypt->cb_cpumask->mask);
462 kfree(pcrypt->cb_cpumask);
464 padata_stop(pcrypt->pinst);
465 padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
466 destroy_workqueue(pcrypt->wq);
467 padata_free(pcrypt->pinst);
470 static struct crypto_template pcrypt_tmpl = {
472 .create = pcrypt_create,
473 .module = THIS_MODULE,
476 static int __init pcrypt_init(void)
480 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
484 err = pcrypt_init_padata(&pencrypt, "pencrypt");
488 err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
490 goto err_deinit_pencrypt;
492 padata_start(pencrypt.pinst);
493 padata_start(pdecrypt.pinst);
495 return crypto_register_template(&pcrypt_tmpl);
498 pcrypt_fini_padata(&pencrypt);
500 kset_unregister(pcrypt_kset);
505 static void __exit pcrypt_exit(void)
507 crypto_unregister_template(&pcrypt_tmpl);
509 pcrypt_fini_padata(&pencrypt);
510 pcrypt_fini_padata(&pdecrypt);
512 kset_unregister(pcrypt_kset);
515 module_init(pcrypt_init);
516 module_exit(pcrypt_exit);
518 MODULE_LICENSE("GPL");
519 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
520 MODULE_DESCRIPTION("Parallel crypto wrapper");
521 MODULE_ALIAS_CRYPTO("pcrypt");