1 /*
2 * pcrypt - Parallel crypto wrapper.
3 *
4 * Copyright (C) 2009 secunet Security Networks AG
5 * Copyright (C) 2009 Steffen Klassert <steffen.klassert@secunet.com>
6 *
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.
10 *
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
14 * more details.
15 *
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.
19 */
20
21 #include <crypto/algapi.h>
22 #include <crypto/internal/aead.h>
23 #include <linux/err.h>
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/slab.h>
27 #include <linux/notifier.h>
28 #include <linux/kobject.h>
29 #include <linux/cpu.h>
30 #include <crypto/pcrypt.h>
31
32 struct padata_pcrypt {
33 struct padata_instance *pinst;
34 struct workqueue_struct *wq;
35
36 /*
37 * Cpumask for callback CPUs. It should be
38 * equal to serial cpumask of corresponding padata instance,
39 * so it is updated when padata notifies us about serial
40 * cpumask change.
41 *
42 * cb_cpumask is protected by RCU. This fact prevents us from
43 * using cpumask_var_t directly because the actual type of
44 * cpumsak_var_t depends on kernel configuration(particularly on
45 * CONFIG_CPUMASK_OFFSTACK macro). Depending on the configuration
46 * cpumask_var_t may be either a pointer to the struct cpumask
47 * or a variable allocated on the stack. Thus we can not safely use
48 * cpumask_var_t with RCU operations such as rcu_assign_pointer or
49 * rcu_dereference. So cpumask_var_t is wrapped with struct
50 * pcrypt_cpumask which makes possible to use it with RCU.
51 */
52 struct pcrypt_cpumask {
53 cpumask_var_t mask;
54 } *cb_cpumask;
55 struct notifier_block nblock;
56 };
57
58 static struct padata_pcrypt pencrypt;
59 static struct padata_pcrypt pdecrypt;
60 static struct kset *pcrypt_kset;
61
62 struct pcrypt_instance_ctx {
63 struct crypto_spawn spawn;
64 unsigned int tfm_count;
65 };
66
67 struct pcrypt_aead_ctx {
68 struct crypto_aead *child;
69 unsigned int cb_cpu;
70 };
71
pcrypt_do_parallel(struct padata_priv * padata,unsigned int * cb_cpu,struct padata_pcrypt * pcrypt)72 static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,
73 struct padata_pcrypt *pcrypt)
74 {
75 unsigned int cpu_index, cpu, i;
76 struct pcrypt_cpumask *cpumask;
77
78 cpu = *cb_cpu;
79
80 rcu_read_lock_bh();
81 cpumask = rcu_dereference(pcrypt->cb_cpumask);
82 if (cpumask_test_cpu(cpu, cpumask->mask))
83 goto out;
84
85 if (!cpumask_weight(cpumask->mask))
86 goto out;
87
88 cpu_index = cpu % cpumask_weight(cpumask->mask);
89
90 cpu = cpumask_first(cpumask->mask);
91 for (i = 0; i < cpu_index; i++)
92 cpu = cpumask_next(cpu, cpumask->mask);
93
94 *cb_cpu = cpu;
95
96 out:
97 rcu_read_unlock_bh();
98 return padata_do_parallel(pcrypt->pinst, padata, cpu);
99 }
100
pcrypt_aead_setkey(struct crypto_aead * parent,const u8 * key,unsigned int keylen)101 static int pcrypt_aead_setkey(struct crypto_aead *parent,
102 const u8 *key, unsigned int keylen)
103 {
104 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
105
106 return crypto_aead_setkey(ctx->child, key, keylen);
107 }
108
pcrypt_aead_setauthsize(struct crypto_aead * parent,unsigned int authsize)109 static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
110 unsigned int authsize)
111 {
112 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
113
114 return crypto_aead_setauthsize(ctx->child, authsize);
115 }
116
pcrypt_aead_serial(struct padata_priv * padata)117 static void pcrypt_aead_serial(struct padata_priv *padata)
118 {
119 struct pcrypt_request *preq = pcrypt_padata_request(padata);
120 struct aead_request *req = pcrypt_request_ctx(preq);
121
122 aead_request_complete(req->base.data, padata->info);
123 }
124
pcrypt_aead_giv_serial(struct padata_priv * padata)125 static void pcrypt_aead_giv_serial(struct padata_priv *padata)
126 {
127 struct pcrypt_request *preq = pcrypt_padata_request(padata);
128 struct aead_givcrypt_request *req = pcrypt_request_ctx(preq);
129
130 aead_request_complete(req->areq.base.data, padata->info);
131 }
132
pcrypt_aead_done(struct crypto_async_request * areq,int err)133 static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
134 {
135 struct aead_request *req = areq->data;
136 struct pcrypt_request *preq = aead_request_ctx(req);
137 struct padata_priv *padata = pcrypt_request_padata(preq);
138
139 padata->info = err;
140 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
141
142 padata_do_serial(padata);
143 }
144
pcrypt_aead_enc(struct padata_priv * padata)145 static void pcrypt_aead_enc(struct padata_priv *padata)
146 {
147 struct pcrypt_request *preq = pcrypt_padata_request(padata);
148 struct aead_request *req = pcrypt_request_ctx(preq);
149
150 padata->info = crypto_aead_encrypt(req);
151
152 if (padata->info == -EINPROGRESS)
153 return;
154
155 padata_do_serial(padata);
156 }
157
pcrypt_aead_encrypt(struct aead_request * req)158 static int pcrypt_aead_encrypt(struct aead_request *req)
159 {
160 int err;
161 struct pcrypt_request *preq = aead_request_ctx(req);
162 struct aead_request *creq = pcrypt_request_ctx(preq);
163 struct padata_priv *padata = pcrypt_request_padata(preq);
164 struct crypto_aead *aead = crypto_aead_reqtfm(req);
165 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
166 u32 flags = aead_request_flags(req);
167
168 memset(padata, 0, sizeof(struct padata_priv));
169
170 padata->parallel = pcrypt_aead_enc;
171 padata->serial = pcrypt_aead_serial;
172
173 aead_request_set_tfm(creq, ctx->child);
174 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
175 pcrypt_aead_done, req);
176 aead_request_set_crypt(creq, req->src, req->dst,
177 req->cryptlen, req->iv);
178 aead_request_set_assoc(creq, req->assoc, req->assoclen);
179
180 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt);
181 if (!err)
182 return -EINPROGRESS;
183
184 return err;
185 }
186
pcrypt_aead_dec(struct padata_priv * padata)187 static void pcrypt_aead_dec(struct padata_priv *padata)
188 {
189 struct pcrypt_request *preq = pcrypt_padata_request(padata);
190 struct aead_request *req = pcrypt_request_ctx(preq);
191
192 padata->info = crypto_aead_decrypt(req);
193
194 if (padata->info == -EINPROGRESS)
195 return;
196
197 padata_do_serial(padata);
198 }
199
pcrypt_aead_decrypt(struct aead_request * req)200 static int pcrypt_aead_decrypt(struct aead_request *req)
201 {
202 int err;
203 struct pcrypt_request *preq = aead_request_ctx(req);
204 struct aead_request *creq = pcrypt_request_ctx(preq);
205 struct padata_priv *padata = pcrypt_request_padata(preq);
206 struct crypto_aead *aead = crypto_aead_reqtfm(req);
207 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
208 u32 flags = aead_request_flags(req);
209
210 memset(padata, 0, sizeof(struct padata_priv));
211
212 padata->parallel = pcrypt_aead_dec;
213 padata->serial = pcrypt_aead_serial;
214
215 aead_request_set_tfm(creq, ctx->child);
216 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
217 pcrypt_aead_done, req);
218 aead_request_set_crypt(creq, req->src, req->dst,
219 req->cryptlen, req->iv);
220 aead_request_set_assoc(creq, req->assoc, req->assoclen);
221
222 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pdecrypt);
223 if (!err)
224 return -EINPROGRESS;
225
226 return err;
227 }
228
pcrypt_aead_givenc(struct padata_priv * padata)229 static void pcrypt_aead_givenc(struct padata_priv *padata)
230 {
231 struct pcrypt_request *preq = pcrypt_padata_request(padata);
232 struct aead_givcrypt_request *req = pcrypt_request_ctx(preq);
233
234 padata->info = crypto_aead_givencrypt(req);
235
236 if (padata->info == -EINPROGRESS)
237 return;
238
239 padata_do_serial(padata);
240 }
241
pcrypt_aead_givencrypt(struct aead_givcrypt_request * req)242 static int pcrypt_aead_givencrypt(struct aead_givcrypt_request *req)
243 {
244 int err;
245 struct aead_request *areq = &req->areq;
246 struct pcrypt_request *preq = aead_request_ctx(areq);
247 struct aead_givcrypt_request *creq = pcrypt_request_ctx(preq);
248 struct padata_priv *padata = pcrypt_request_padata(preq);
249 struct crypto_aead *aead = aead_givcrypt_reqtfm(req);
250 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
251 u32 flags = aead_request_flags(areq);
252
253 memset(padata, 0, sizeof(struct padata_priv));
254
255 padata->parallel = pcrypt_aead_givenc;
256 padata->serial = pcrypt_aead_giv_serial;
257
258 aead_givcrypt_set_tfm(creq, ctx->child);
259 aead_givcrypt_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
260 pcrypt_aead_done, areq);
261 aead_givcrypt_set_crypt(creq, areq->src, areq->dst,
262 areq->cryptlen, areq->iv);
263 aead_givcrypt_set_assoc(creq, areq->assoc, areq->assoclen);
264 aead_givcrypt_set_giv(creq, req->giv, req->seq);
265
266 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt);
267 if (!err)
268 return -EINPROGRESS;
269
270 return err;
271 }
272
pcrypt_aead_init_tfm(struct crypto_tfm * tfm)273 static int pcrypt_aead_init_tfm(struct crypto_tfm *tfm)
274 {
275 int cpu, cpu_index;
276 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
277 struct pcrypt_instance_ctx *ictx = crypto_instance_ctx(inst);
278 struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm);
279 struct crypto_aead *cipher;
280
281 ictx->tfm_count++;
282
283 cpu_index = ictx->tfm_count % cpumask_weight(cpu_online_mask);
284
285 ctx->cb_cpu = cpumask_first(cpu_online_mask);
286 for (cpu = 0; cpu < cpu_index; cpu++)
287 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
288
289 cipher = crypto_spawn_aead(crypto_instance_ctx(inst));
290
291 if (IS_ERR(cipher))
292 return PTR_ERR(cipher);
293
294 ctx->child = cipher;
295 tfm->crt_aead.reqsize = sizeof(struct pcrypt_request)
296 + sizeof(struct aead_givcrypt_request)
297 + crypto_aead_reqsize(cipher);
298
299 return 0;
300 }
301
pcrypt_aead_exit_tfm(struct crypto_tfm * tfm)302 static void pcrypt_aead_exit_tfm(struct crypto_tfm *tfm)
303 {
304 struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm);
305
306 crypto_free_aead(ctx->child);
307 }
308
pcrypt_alloc_instance(struct crypto_alg * alg)309 static struct crypto_instance *pcrypt_alloc_instance(struct crypto_alg *alg)
310 {
311 struct crypto_instance *inst;
312 struct pcrypt_instance_ctx *ctx;
313 int err;
314
315 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
316 if (!inst) {
317 inst = ERR_PTR(-ENOMEM);
318 goto out;
319 }
320
321 err = -ENAMETOOLONG;
322 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
323 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
324 goto out_free_inst;
325
326 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
327
328 ctx = crypto_instance_ctx(inst);
329 err = crypto_init_spawn(&ctx->spawn, alg, inst,
330 CRYPTO_ALG_TYPE_MASK);
331 if (err)
332 goto out_free_inst;
333
334 inst->alg.cra_priority = alg->cra_priority + 100;
335 inst->alg.cra_blocksize = alg->cra_blocksize;
336 inst->alg.cra_alignmask = alg->cra_alignmask;
337
338 out:
339 return inst;
340
341 out_free_inst:
342 kfree(inst);
343 inst = ERR_PTR(err);
344 goto out;
345 }
346
pcrypt_alloc_aead(struct rtattr ** tb,u32 type,u32 mask)347 static struct crypto_instance *pcrypt_alloc_aead(struct rtattr **tb,
348 u32 type, u32 mask)
349 {
350 struct crypto_instance *inst;
351 struct crypto_alg *alg;
352
353 alg = crypto_get_attr_alg(tb, type, (mask & CRYPTO_ALG_TYPE_MASK));
354 if (IS_ERR(alg))
355 return ERR_CAST(alg);
356
357 inst = pcrypt_alloc_instance(alg);
358 if (IS_ERR(inst))
359 goto out_put_alg;
360
361 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
362 inst->alg.cra_type = &crypto_aead_type;
363
364 inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
365 inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
366 inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
367
368 inst->alg.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
369
370 inst->alg.cra_init = pcrypt_aead_init_tfm;
371 inst->alg.cra_exit = pcrypt_aead_exit_tfm;
372
373 inst->alg.cra_aead.setkey = pcrypt_aead_setkey;
374 inst->alg.cra_aead.setauthsize = pcrypt_aead_setauthsize;
375 inst->alg.cra_aead.encrypt = pcrypt_aead_encrypt;
376 inst->alg.cra_aead.decrypt = pcrypt_aead_decrypt;
377 inst->alg.cra_aead.givencrypt = pcrypt_aead_givencrypt;
378
379 out_put_alg:
380 crypto_mod_put(alg);
381 return inst;
382 }
383
pcrypt_alloc(struct rtattr ** tb)384 static struct crypto_instance *pcrypt_alloc(struct rtattr **tb)
385 {
386 struct crypto_attr_type *algt;
387
388 algt = crypto_get_attr_type(tb);
389 if (IS_ERR(algt))
390 return ERR_CAST(algt);
391
392 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
393 case CRYPTO_ALG_TYPE_AEAD:
394 return pcrypt_alloc_aead(tb, algt->type, algt->mask);
395 }
396
397 return ERR_PTR(-EINVAL);
398 }
399
pcrypt_free(struct crypto_instance * inst)400 static void pcrypt_free(struct crypto_instance *inst)
401 {
402 struct pcrypt_instance_ctx *ctx = crypto_instance_ctx(inst);
403
404 crypto_drop_spawn(&ctx->spawn);
405 kfree(inst);
406 }
407
pcrypt_cpumask_change_notify(struct notifier_block * self,unsigned long val,void * data)408 static int pcrypt_cpumask_change_notify(struct notifier_block *self,
409 unsigned long val, void *data)
410 {
411 struct padata_pcrypt *pcrypt;
412 struct pcrypt_cpumask *new_mask, *old_mask;
413 struct padata_cpumask *cpumask = (struct padata_cpumask *)data;
414
415 if (!(val & PADATA_CPU_SERIAL))
416 return 0;
417
418 pcrypt = container_of(self, struct padata_pcrypt, nblock);
419 new_mask = kmalloc(sizeof(*new_mask), GFP_KERNEL);
420 if (!new_mask)
421 return -ENOMEM;
422 if (!alloc_cpumask_var(&new_mask->mask, GFP_KERNEL)) {
423 kfree(new_mask);
424 return -ENOMEM;
425 }
426
427 old_mask = pcrypt->cb_cpumask;
428
429 cpumask_copy(new_mask->mask, cpumask->cbcpu);
430 rcu_assign_pointer(pcrypt->cb_cpumask, new_mask);
431 synchronize_rcu_bh();
432
433 free_cpumask_var(old_mask->mask);
434 kfree(old_mask);
435 return 0;
436 }
437
pcrypt_sysfs_add(struct padata_instance * pinst,const char * name)438 static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
439 {
440 int ret;
441
442 pinst->kobj.kset = pcrypt_kset;
443 ret = kobject_add(&pinst->kobj, NULL, name);
444 if (!ret)
445 kobject_uevent(&pinst->kobj, KOBJ_ADD);
446
447 return ret;
448 }
449
pcrypt_init_padata(struct padata_pcrypt * pcrypt,const char * name)450 static int pcrypt_init_padata(struct padata_pcrypt *pcrypt,
451 const char *name)
452 {
453 int ret = -ENOMEM;
454 struct pcrypt_cpumask *mask;
455
456 get_online_cpus();
457
458 pcrypt->wq = alloc_workqueue(name,
459 WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE, 1);
460 if (!pcrypt->wq)
461 goto err;
462
463 pcrypt->pinst = padata_alloc_possible(pcrypt->wq);
464 if (!pcrypt->pinst)
465 goto err_destroy_workqueue;
466
467 mask = kmalloc(sizeof(*mask), GFP_KERNEL);
468 if (!mask)
469 goto err_free_padata;
470 if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) {
471 kfree(mask);
472 goto err_free_padata;
473 }
474
475 cpumask_and(mask->mask, cpu_possible_mask, cpu_online_mask);
476 rcu_assign_pointer(pcrypt->cb_cpumask, mask);
477
478 pcrypt->nblock.notifier_call = pcrypt_cpumask_change_notify;
479 ret = padata_register_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
480 if (ret)
481 goto err_free_cpumask;
482
483 ret = pcrypt_sysfs_add(pcrypt->pinst, name);
484 if (ret)
485 goto err_unregister_notifier;
486
487 put_online_cpus();
488
489 return ret;
490
491 err_unregister_notifier:
492 padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
493 err_free_cpumask:
494 free_cpumask_var(mask->mask);
495 kfree(mask);
496 err_free_padata:
497 padata_free(pcrypt->pinst);
498 err_destroy_workqueue:
499 destroy_workqueue(pcrypt->wq);
500 err:
501 put_online_cpus();
502
503 return ret;
504 }
505
pcrypt_fini_padata(struct padata_pcrypt * pcrypt)506 static void pcrypt_fini_padata(struct padata_pcrypt *pcrypt)
507 {
508 free_cpumask_var(pcrypt->cb_cpumask->mask);
509 kfree(pcrypt->cb_cpumask);
510
511 padata_stop(pcrypt->pinst);
512 padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
513 destroy_workqueue(pcrypt->wq);
514 padata_free(pcrypt->pinst);
515 }
516
517 static struct crypto_template pcrypt_tmpl = {
518 .name = "pcrypt",
519 .alloc = pcrypt_alloc,
520 .free = pcrypt_free,
521 .module = THIS_MODULE,
522 };
523
pcrypt_init(void)524 static int __init pcrypt_init(void)
525 {
526 int err = -ENOMEM;
527
528 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
529 if (!pcrypt_kset)
530 goto err;
531
532 err = pcrypt_init_padata(&pencrypt, "pencrypt");
533 if (err)
534 goto err_unreg_kset;
535
536 err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
537 if (err)
538 goto err_deinit_pencrypt;
539
540 padata_start(pencrypt.pinst);
541 padata_start(pdecrypt.pinst);
542
543 return crypto_register_template(&pcrypt_tmpl);
544
545 err_deinit_pencrypt:
546 pcrypt_fini_padata(&pencrypt);
547 err_unreg_kset:
548 kset_unregister(pcrypt_kset);
549 err:
550 return err;
551 }
552
pcrypt_exit(void)553 static void __exit pcrypt_exit(void)
554 {
555 pcrypt_fini_padata(&pencrypt);
556 pcrypt_fini_padata(&pdecrypt);
557
558 kset_unregister(pcrypt_kset);
559 crypto_unregister_template(&pcrypt_tmpl);
560 }
561
562 module_init(pcrypt_init);
563 module_exit(pcrypt_exit);
564
565 MODULE_LICENSE("GPL");
566 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
567 MODULE_DESCRIPTION("Parallel crypto wrapper");
568