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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/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>
32
33 struct padata_pcrypt {
34 struct padata_instance *pinst;
35 struct workqueue_struct *wq;
36
37 /*
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
41 * cpumask change.
42 *
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.
52 */
53 struct pcrypt_cpumask {
54 cpumask_var_t mask;
55 } *cb_cpumask;
56 struct notifier_block nblock;
57 };
58
59 static struct padata_pcrypt pencrypt;
60 static struct padata_pcrypt pdecrypt;
61 static struct kset *pcrypt_kset;
62
63 struct pcrypt_instance_ctx {
64 struct crypto_aead_spawn spawn;
65 atomic_t tfm_count;
66 };
67
68 struct pcrypt_aead_ctx {
69 struct crypto_aead *child;
70 unsigned int cb_cpu;
71 };
72
73 static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,
74 struct padata_pcrypt *pcrypt)
75 {
76 unsigned int cpu_index, cpu, i;
77 struct pcrypt_cpumask *cpumask;
78
79 cpu = *cb_cpu;
80
81 rcu_read_lock_bh();
82 cpumask = rcu_dereference_bh(pcrypt->cb_cpumask);
83 if (cpumask_test_cpu(cpu, cpumask->mask))
84 goto out;
85
86 if (!cpumask_weight(cpumask->mask))
87 goto out;
88
89 cpu_index = cpu % cpumask_weight(cpumask->mask);
90
91 cpu = cpumask_first(cpumask->mask);
92 for (i = 0; i < cpu_index; i++)
93 cpu = cpumask_next(cpu, cpumask->mask);
94
95 *cb_cpu = cpu;
96
97 out:
98 rcu_read_unlock_bh();
99 return padata_do_parallel(pcrypt->pinst, padata, cpu);
100 }
101
102 static int pcrypt_aead_setkey(struct crypto_aead *parent,
103 const u8 *key, unsigned int keylen)
104 {
105 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
106
107 return crypto_aead_setkey(ctx->child, key, keylen);
108 }
109
110 static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
111 unsigned int authsize)
112 {
113 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
114
115 return crypto_aead_setauthsize(ctx->child, authsize);
116 }
117
118 static void pcrypt_aead_serial(struct padata_priv *padata)
119 {
120 struct pcrypt_request *preq = pcrypt_padata_request(padata);
121 struct aead_request *req = pcrypt_request_ctx(preq);
122
123 aead_request_complete(req->base.data, padata->info);
124 }
125
126 static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
127 {
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);
131
132 padata->info = err;
133 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
134
135 padata_do_serial(padata);
136 }
137
138 static void pcrypt_aead_enc(struct padata_priv *padata)
139 {
140 struct pcrypt_request *preq = pcrypt_padata_request(padata);
141 struct aead_request *req = pcrypt_request_ctx(preq);
142
143 padata->info = crypto_aead_encrypt(req);
144
145 if (padata->info == -EINPROGRESS)
146 return;
147
148 padata_do_serial(padata);
149 }
150
151 static int pcrypt_aead_encrypt(struct aead_request *req)
152 {
153 int err;
154 struct pcrypt_request *preq = aead_request_ctx(req);
155 struct aead_request *creq = pcrypt_request_ctx(preq);
156 struct padata_priv *padata = pcrypt_request_padata(preq);
157 struct crypto_aead *aead = crypto_aead_reqtfm(req);
158 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
159 u32 flags = aead_request_flags(req);
160
161 memset(padata, 0, sizeof(struct padata_priv));
162
163 padata->parallel = pcrypt_aead_enc;
164 padata->serial = pcrypt_aead_serial;
165
166 aead_request_set_tfm(creq, ctx->child);
167 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
168 pcrypt_aead_done, req);
169 aead_request_set_crypt(creq, req->src, req->dst,
170 req->cryptlen, req->iv);
171 aead_request_set_ad(creq, req->assoclen);
172
173 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt);
174 if (!err)
175 return -EINPROGRESS;
176
177 return err;
178 }
179
180 static void pcrypt_aead_dec(struct padata_priv *padata)
181 {
182 struct pcrypt_request *preq = pcrypt_padata_request(padata);
183 struct aead_request *req = pcrypt_request_ctx(preq);
184
185 padata->info = crypto_aead_decrypt(req);
186
187 if (padata->info == -EINPROGRESS)
188 return;
189
190 padata_do_serial(padata);
191 }
192
193 static int pcrypt_aead_decrypt(struct aead_request *req)
194 {
195 int err;
196 struct pcrypt_request *preq = aead_request_ctx(req);
197 struct aead_request *creq = pcrypt_request_ctx(preq);
198 struct padata_priv *padata = pcrypt_request_padata(preq);
199 struct crypto_aead *aead = crypto_aead_reqtfm(req);
200 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
201 u32 flags = aead_request_flags(req);
202
203 memset(padata, 0, sizeof(struct padata_priv));
204
205 padata->parallel = pcrypt_aead_dec;
206 padata->serial = pcrypt_aead_serial;
207
208 aead_request_set_tfm(creq, ctx->child);
209 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
210 pcrypt_aead_done, req);
211 aead_request_set_crypt(creq, req->src, req->dst,
212 req->cryptlen, req->iv);
213 aead_request_set_ad(creq, req->assoclen);
214
215 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pdecrypt);
216 if (!err)
217 return -EINPROGRESS;
218
219 return err;
220 }
221
222 static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
223 {
224 int cpu, cpu_index;
225 struct aead_instance *inst = aead_alg_instance(tfm);
226 struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
227 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
228 struct crypto_aead *cipher;
229
230 cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
231 cpumask_weight(cpu_online_mask);
232
233 ctx->cb_cpu = cpumask_first(cpu_online_mask);
234 for (cpu = 0; cpu < cpu_index; cpu++)
235 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
236
237 cipher = crypto_spawn_aead(&ictx->spawn);
238
239 if (IS_ERR(cipher))
240 return PTR_ERR(cipher);
241
242 ctx->child = cipher;
243 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
244 sizeof(struct aead_request) +
245 crypto_aead_reqsize(cipher));
246
247 return 0;
248 }
249
250 static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
251 {
252 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
253
254 crypto_free_aead(ctx->child);
255 }
256
257 static int pcrypt_init_instance(struct crypto_instance *inst,
258 struct crypto_alg *alg)
259 {
260 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
261 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
262 return -ENAMETOOLONG;
263
264 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
265
266 inst->alg.cra_priority = alg->cra_priority + 100;
267 inst->alg.cra_blocksize = alg->cra_blocksize;
268 inst->alg.cra_alignmask = alg->cra_alignmask;
269
270 return 0;
271 }
272
273 static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
274 u32 type, u32 mask)
275 {
276 struct pcrypt_instance_ctx *ctx;
277 struct aead_instance *inst;
278 struct aead_alg *alg;
279 const char *name;
280 int err;
281
282 name = crypto_attr_alg_name(tb[1]);
283 if (IS_ERR(name))
284 return PTR_ERR(name);
285
286 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
287 if (!inst)
288 return -ENOMEM;
289
290 ctx = aead_instance_ctx(inst);
291 crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst));
292
293 err = crypto_grab_aead(&ctx->spawn, name, 0, 0);
294 if (err)
295 goto out_free_inst;
296
297 alg = crypto_spawn_aead_alg(&ctx->spawn);
298 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
299 if (err)
300 goto out_drop_aead;
301
302 inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
303 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
304
305 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
306
307 inst->alg.init = pcrypt_aead_init_tfm;
308 inst->alg.exit = pcrypt_aead_exit_tfm;
309
310 inst->alg.setkey = pcrypt_aead_setkey;
311 inst->alg.setauthsize = pcrypt_aead_setauthsize;
312 inst->alg.encrypt = pcrypt_aead_encrypt;
313 inst->alg.decrypt = pcrypt_aead_decrypt;
314
315 err = aead_register_instance(tmpl, inst);
316 if (err)
317 goto out_drop_aead;
318
319 out:
320 return err;
321
322 out_drop_aead:
323 crypto_drop_aead(&ctx->spawn);
324 out_free_inst:
325 kfree(inst);
326 goto out;
327 }
328
329 static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
330 {
331 struct crypto_attr_type *algt;
332
333 algt = crypto_get_attr_type(tb);
334 if (IS_ERR(algt))
335 return PTR_ERR(algt);
336
337 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
338 case CRYPTO_ALG_TYPE_AEAD:
339 return pcrypt_create_aead(tmpl, tb, algt->type, algt->mask);
340 }
341
342 return -EINVAL;
343 }
344
345 static void pcrypt_free(struct crypto_instance *inst)
346 {
347 struct pcrypt_instance_ctx *ctx = crypto_instance_ctx(inst);
348
349 crypto_drop_aead(&ctx->spawn);
350 kfree(inst);
351 }
352
353 static int pcrypt_cpumask_change_notify(struct notifier_block *self,
354 unsigned long val, void *data)
355 {
356 struct padata_pcrypt *pcrypt;
357 struct pcrypt_cpumask *new_mask, *old_mask;
358 struct padata_cpumask *cpumask = (struct padata_cpumask *)data;
359
360 if (!(val & PADATA_CPU_SERIAL))
361 return 0;
362
363 pcrypt = container_of(self, struct padata_pcrypt, nblock);
364 new_mask = kmalloc(sizeof(*new_mask), GFP_KERNEL);
365 if (!new_mask)
366 return -ENOMEM;
367 if (!alloc_cpumask_var(&new_mask->mask, GFP_KERNEL)) {
368 kfree(new_mask);
369 return -ENOMEM;
370 }
371
372 old_mask = pcrypt->cb_cpumask;
373
374 cpumask_copy(new_mask->mask, cpumask->cbcpu);
375 rcu_assign_pointer(pcrypt->cb_cpumask, new_mask);
376 synchronize_rcu_bh();
377
378 free_cpumask_var(old_mask->mask);
379 kfree(old_mask);
380 return 0;
381 }
382
383 static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
384 {
385 int ret;
386
387 pinst->kobj.kset = pcrypt_kset;
388 ret = kobject_add(&pinst->kobj, NULL, name);
389 if (!ret)
390 kobject_uevent(&pinst->kobj, KOBJ_ADD);
391
392 return ret;
393 }
394
395 static int pcrypt_init_padata(struct padata_pcrypt *pcrypt,
396 const char *name)
397 {
398 int ret = -ENOMEM;
399 struct pcrypt_cpumask *mask;
400
401 get_online_cpus();
402
403 pcrypt->wq = alloc_workqueue("%s", WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE,
404 1, name);
405 if (!pcrypt->wq)
406 goto err;
407
408 pcrypt->pinst = padata_alloc_possible(pcrypt->wq);
409 if (!pcrypt->pinst)
410 goto err_destroy_workqueue;
411
412 mask = kmalloc(sizeof(*mask), GFP_KERNEL);
413 if (!mask)
414 goto err_free_padata;
415 if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) {
416 kfree(mask);
417 goto err_free_padata;
418 }
419
420 cpumask_and(mask->mask, cpu_possible_mask, cpu_online_mask);
421 rcu_assign_pointer(pcrypt->cb_cpumask, mask);
422
423 pcrypt->nblock.notifier_call = pcrypt_cpumask_change_notify;
424 ret = padata_register_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
425 if (ret)
426 goto err_free_cpumask;
427
428 ret = pcrypt_sysfs_add(pcrypt->pinst, name);
429 if (ret)
430 goto err_unregister_notifier;
431
432 put_online_cpus();
433
434 return ret;
435
436 err_unregister_notifier:
437 padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
438 err_free_cpumask:
439 free_cpumask_var(mask->mask);
440 kfree(mask);
441 err_free_padata:
442 padata_free(pcrypt->pinst);
443 err_destroy_workqueue:
444 destroy_workqueue(pcrypt->wq);
445 err:
446 put_online_cpus();
447
448 return ret;
449 }
450
451 static void pcrypt_fini_padata(struct padata_pcrypt *pcrypt)
452 {
453 free_cpumask_var(pcrypt->cb_cpumask->mask);
454 kfree(pcrypt->cb_cpumask);
455
456 padata_stop(pcrypt->pinst);
457 padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
458 destroy_workqueue(pcrypt->wq);
459 padata_free(pcrypt->pinst);
460 }
461
462 static struct crypto_template pcrypt_tmpl = {
463 .name = "pcrypt",
464 .create = pcrypt_create,
465 .free = pcrypt_free,
466 .module = THIS_MODULE,
467 };
468
469 static int __init pcrypt_init(void)
470 {
471 int err = -ENOMEM;
472
473 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
474 if (!pcrypt_kset)
475 goto err;
476
477 err = pcrypt_init_padata(&pencrypt, "pencrypt");
478 if (err)
479 goto err_unreg_kset;
480
481 err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
482 if (err)
483 goto err_deinit_pencrypt;
484
485 padata_start(pencrypt.pinst);
486 padata_start(pdecrypt.pinst);
487
488 return crypto_register_template(&pcrypt_tmpl);
489
490 err_deinit_pencrypt:
491 pcrypt_fini_padata(&pencrypt);
492 err_unreg_kset:
493 kset_unregister(pcrypt_kset);
494 err:
495 return err;
496 }
497
498 static void __exit pcrypt_exit(void)
499 {
500 pcrypt_fini_padata(&pencrypt);
501 pcrypt_fini_padata(&pdecrypt);
502
503 kset_unregister(pcrypt_kset);
504 crypto_unregister_template(&pcrypt_tmpl);
505 }
506
507 module_init(pcrypt_init);
508 module_exit(pcrypt_exit);
509
510 MODULE_LICENSE("GPL");
511 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
512 MODULE_DESCRIPTION("Parallel crypto wrapper");
513 MODULE_ALIAS_CRYPTO("pcrypt");