xref: /linux/crypto/pcrypt.c (revision 5499b45190237ca90dd2ac86395cf464fe1f4cc7)
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 <crypto/pcrypt.h>
28 
29 static struct padata_instance *pcrypt_enc_padata;
30 static struct padata_instance *pcrypt_dec_padata;
31 static struct workqueue_struct *encwq;
32 static struct workqueue_struct *decwq;
33 
34 struct pcrypt_instance_ctx {
35 	struct crypto_spawn spawn;
36 	unsigned int tfm_count;
37 };
38 
39 struct pcrypt_aead_ctx {
40 	struct crypto_aead *child;
41 	unsigned int cb_cpu;
42 };
43 
44 static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,
45 			      struct padata_instance *pinst)
46 {
47 	unsigned int cpu_index, cpu, i;
48 
49 	cpu = *cb_cpu;
50 
51 	if (cpumask_test_cpu(cpu, cpu_active_mask))
52 			goto out;
53 
54 	cpu_index = cpu % cpumask_weight(cpu_active_mask);
55 
56 	cpu = cpumask_first(cpu_active_mask);
57 	for (i = 0; i < cpu_index; i++)
58 		cpu = cpumask_next(cpu, cpu_active_mask);
59 
60 	*cb_cpu = cpu;
61 
62 out:
63 	return padata_do_parallel(pinst, padata, cpu);
64 }
65 
66 static int pcrypt_aead_setkey(struct crypto_aead *parent,
67 			      const u8 *key, unsigned int keylen)
68 {
69 	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
70 
71 	return crypto_aead_setkey(ctx->child, key, keylen);
72 }
73 
74 static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
75 				   unsigned int authsize)
76 {
77 	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
78 
79 	return crypto_aead_setauthsize(ctx->child, authsize);
80 }
81 
82 static void pcrypt_aead_serial(struct padata_priv *padata)
83 {
84 	struct pcrypt_request *preq = pcrypt_padata_request(padata);
85 	struct aead_request *req = pcrypt_request_ctx(preq);
86 
87 	aead_request_complete(req->base.data, padata->info);
88 }
89 
90 static void pcrypt_aead_giv_serial(struct padata_priv *padata)
91 {
92 	struct pcrypt_request *preq = pcrypt_padata_request(padata);
93 	struct aead_givcrypt_request *req = pcrypt_request_ctx(preq);
94 
95 	aead_request_complete(req->areq.base.data, padata->info);
96 }
97 
98 static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
99 {
100 	struct aead_request *req = areq->data;
101 	struct pcrypt_request *preq = aead_request_ctx(req);
102 	struct padata_priv *padata = pcrypt_request_padata(preq);
103 
104 	padata->info = err;
105 	req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
106 
107 	padata_do_serial(padata);
108 }
109 
110 static void pcrypt_aead_enc(struct padata_priv *padata)
111 {
112 	struct pcrypt_request *preq = pcrypt_padata_request(padata);
113 	struct aead_request *req = pcrypt_request_ctx(preq);
114 
115 	padata->info = crypto_aead_encrypt(req);
116 
117 	if (padata->info == -EINPROGRESS)
118 		return;
119 
120 	padata_do_serial(padata);
121 }
122 
123 static int pcrypt_aead_encrypt(struct aead_request *req)
124 {
125 	int err;
126 	struct pcrypt_request *preq = aead_request_ctx(req);
127 	struct aead_request *creq = pcrypt_request_ctx(preq);
128 	struct padata_priv *padata = pcrypt_request_padata(preq);
129 	struct crypto_aead *aead = crypto_aead_reqtfm(req);
130 	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
131 	u32 flags = aead_request_flags(req);
132 
133 	memset(padata, 0, sizeof(struct padata_priv));
134 
135 	padata->parallel = pcrypt_aead_enc;
136 	padata->serial = pcrypt_aead_serial;
137 
138 	aead_request_set_tfm(creq, ctx->child);
139 	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
140 				  pcrypt_aead_done, req);
141 	aead_request_set_crypt(creq, req->src, req->dst,
142 			       req->cryptlen, req->iv);
143 	aead_request_set_assoc(creq, req->assoc, req->assoclen);
144 
145 	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);
146 	if (err)
147 		return err;
148 	else
149 		err = crypto_aead_encrypt(creq);
150 
151 	return err;
152 }
153 
154 static void pcrypt_aead_dec(struct padata_priv *padata)
155 {
156 	struct pcrypt_request *preq = pcrypt_padata_request(padata);
157 	struct aead_request *req = pcrypt_request_ctx(preq);
158 
159 	padata->info = crypto_aead_decrypt(req);
160 
161 	if (padata->info == -EINPROGRESS)
162 		return;
163 
164 	padata_do_serial(padata);
165 }
166 
167 static int pcrypt_aead_decrypt(struct aead_request *req)
168 {
169 	int err;
170 	struct pcrypt_request *preq = aead_request_ctx(req);
171 	struct aead_request *creq = pcrypt_request_ctx(preq);
172 	struct padata_priv *padata = pcrypt_request_padata(preq);
173 	struct crypto_aead *aead = crypto_aead_reqtfm(req);
174 	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
175 	u32 flags = aead_request_flags(req);
176 
177 	memset(padata, 0, sizeof(struct padata_priv));
178 
179 	padata->parallel = pcrypt_aead_dec;
180 	padata->serial = pcrypt_aead_serial;
181 
182 	aead_request_set_tfm(creq, ctx->child);
183 	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
184 				  pcrypt_aead_done, req);
185 	aead_request_set_crypt(creq, req->src, req->dst,
186 			       req->cryptlen, req->iv);
187 	aead_request_set_assoc(creq, req->assoc, req->assoclen);
188 
189 	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_dec_padata);
190 	if (err)
191 		return err;
192 	else
193 		err = crypto_aead_decrypt(creq);
194 
195 	return err;
196 }
197 
198 static void pcrypt_aead_givenc(struct padata_priv *padata)
199 {
200 	struct pcrypt_request *preq = pcrypt_padata_request(padata);
201 	struct aead_givcrypt_request *req = pcrypt_request_ctx(preq);
202 
203 	padata->info = crypto_aead_givencrypt(req);
204 
205 	if (padata->info == -EINPROGRESS)
206 		return;
207 
208 	padata_do_serial(padata);
209 }
210 
211 static int pcrypt_aead_givencrypt(struct aead_givcrypt_request *req)
212 {
213 	int err;
214 	struct aead_request *areq = &req->areq;
215 	struct pcrypt_request *preq = aead_request_ctx(areq);
216 	struct aead_givcrypt_request *creq = pcrypt_request_ctx(preq);
217 	struct padata_priv *padata = pcrypt_request_padata(preq);
218 	struct crypto_aead *aead = aead_givcrypt_reqtfm(req);
219 	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
220 	u32 flags = aead_request_flags(areq);
221 
222 	memset(padata, 0, sizeof(struct padata_priv));
223 
224 	padata->parallel = pcrypt_aead_givenc;
225 	padata->serial = pcrypt_aead_giv_serial;
226 
227 	aead_givcrypt_set_tfm(creq, ctx->child);
228 	aead_givcrypt_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
229 				   pcrypt_aead_done, areq);
230 	aead_givcrypt_set_crypt(creq, areq->src, areq->dst,
231 				areq->cryptlen, areq->iv);
232 	aead_givcrypt_set_assoc(creq, areq->assoc, areq->assoclen);
233 	aead_givcrypt_set_giv(creq, req->giv, req->seq);
234 
235 	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);
236 	if (err)
237 		return err;
238 	else
239 		err = crypto_aead_givencrypt(creq);
240 
241 	return err;
242 }
243 
244 static int pcrypt_aead_init_tfm(struct crypto_tfm *tfm)
245 {
246 	int cpu, cpu_index;
247 	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
248 	struct pcrypt_instance_ctx *ictx = crypto_instance_ctx(inst);
249 	struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm);
250 	struct crypto_aead *cipher;
251 
252 	ictx->tfm_count++;
253 
254 	cpu_index = ictx->tfm_count % cpumask_weight(cpu_active_mask);
255 
256 	ctx->cb_cpu = cpumask_first(cpu_active_mask);
257 	for (cpu = 0; cpu < cpu_index; cpu++)
258 		ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_active_mask);
259 
260 	cipher = crypto_spawn_aead(crypto_instance_ctx(inst));
261 
262 	if (IS_ERR(cipher))
263 		return PTR_ERR(cipher);
264 
265 	ctx->child = cipher;
266 	tfm->crt_aead.reqsize = sizeof(struct pcrypt_request)
267 		+ sizeof(struct aead_givcrypt_request)
268 		+ crypto_aead_reqsize(cipher);
269 
270 	return 0;
271 }
272 
273 static void pcrypt_aead_exit_tfm(struct crypto_tfm *tfm)
274 {
275 	struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm);
276 
277 	crypto_free_aead(ctx->child);
278 }
279 
280 static struct crypto_instance *pcrypt_alloc_instance(struct crypto_alg *alg)
281 {
282 	struct crypto_instance *inst;
283 	struct pcrypt_instance_ctx *ctx;
284 	int err;
285 
286 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
287 	if (!inst) {
288 		inst = ERR_PTR(-ENOMEM);
289 		goto out;
290 	}
291 
292 	err = -ENAMETOOLONG;
293 	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
294 		     "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
295 		goto out_free_inst;
296 
297 	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
298 
299 	ctx = crypto_instance_ctx(inst);
300 	err = crypto_init_spawn(&ctx->spawn, alg, inst,
301 				CRYPTO_ALG_TYPE_MASK);
302 	if (err)
303 		goto out_free_inst;
304 
305 	inst->alg.cra_priority = alg->cra_priority + 100;
306 	inst->alg.cra_blocksize = alg->cra_blocksize;
307 	inst->alg.cra_alignmask = alg->cra_alignmask;
308 
309 out:
310 	return inst;
311 
312 out_free_inst:
313 	kfree(inst);
314 	inst = ERR_PTR(err);
315 	goto out;
316 }
317 
318 static struct crypto_instance *pcrypt_alloc_aead(struct rtattr **tb)
319 {
320 	struct crypto_instance *inst;
321 	struct crypto_alg *alg;
322 	struct crypto_attr_type *algt;
323 
324 	algt = crypto_get_attr_type(tb);
325 
326 	alg = crypto_get_attr_alg(tb, algt->type,
327 				  (algt->mask & CRYPTO_ALG_TYPE_MASK));
328 	if (IS_ERR(alg))
329 		return ERR_CAST(alg);
330 
331 	inst = pcrypt_alloc_instance(alg);
332 	if (IS_ERR(inst))
333 		goto out_put_alg;
334 
335 	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
336 	inst->alg.cra_type = &crypto_aead_type;
337 
338 	inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
339 	inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
340 	inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
341 
342 	inst->alg.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
343 
344 	inst->alg.cra_init = pcrypt_aead_init_tfm;
345 	inst->alg.cra_exit = pcrypt_aead_exit_tfm;
346 
347 	inst->alg.cra_aead.setkey = pcrypt_aead_setkey;
348 	inst->alg.cra_aead.setauthsize = pcrypt_aead_setauthsize;
349 	inst->alg.cra_aead.encrypt = pcrypt_aead_encrypt;
350 	inst->alg.cra_aead.decrypt = pcrypt_aead_decrypt;
351 	inst->alg.cra_aead.givencrypt = pcrypt_aead_givencrypt;
352 
353 out_put_alg:
354 	crypto_mod_put(alg);
355 	return inst;
356 }
357 
358 static struct crypto_instance *pcrypt_alloc(struct rtattr **tb)
359 {
360 	struct crypto_attr_type *algt;
361 
362 	algt = crypto_get_attr_type(tb);
363 	if (IS_ERR(algt))
364 		return ERR_CAST(algt);
365 
366 	switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
367 	case CRYPTO_ALG_TYPE_AEAD:
368 		return pcrypt_alloc_aead(tb);
369 	}
370 
371 	return ERR_PTR(-EINVAL);
372 }
373 
374 static void pcrypt_free(struct crypto_instance *inst)
375 {
376 	struct pcrypt_instance_ctx *ctx = crypto_instance_ctx(inst);
377 
378 	crypto_drop_spawn(&ctx->spawn);
379 	kfree(inst);
380 }
381 
382 static struct crypto_template pcrypt_tmpl = {
383 	.name = "pcrypt",
384 	.alloc = pcrypt_alloc,
385 	.free = pcrypt_free,
386 	.module = THIS_MODULE,
387 };
388 
389 static int __init pcrypt_init(void)
390 {
391 	encwq = create_workqueue("pencrypt");
392 	if (!encwq)
393 		goto err;
394 
395 	decwq = create_workqueue("pdecrypt");
396 	if (!decwq)
397 		goto err_destroy_encwq;
398 
399 
400 	pcrypt_enc_padata = padata_alloc(cpu_possible_mask, encwq);
401 	if (!pcrypt_enc_padata)
402 		goto err_destroy_decwq;
403 
404 	pcrypt_dec_padata = padata_alloc(cpu_possible_mask, decwq);
405 	if (!pcrypt_dec_padata)
406 		goto err_free_padata;
407 
408 	padata_start(pcrypt_enc_padata);
409 	padata_start(pcrypt_dec_padata);
410 
411 	return crypto_register_template(&pcrypt_tmpl);
412 
413 err_free_padata:
414 	padata_free(pcrypt_enc_padata);
415 
416 err_destroy_decwq:
417 	destroy_workqueue(decwq);
418 
419 err_destroy_encwq:
420 	destroy_workqueue(encwq);
421 
422 err:
423 	return -ENOMEM;
424 }
425 
426 static void __exit pcrypt_exit(void)
427 {
428 	padata_stop(pcrypt_enc_padata);
429 	padata_stop(pcrypt_dec_padata);
430 
431 	destroy_workqueue(encwq);
432 	destroy_workqueue(decwq);
433 
434 	padata_free(pcrypt_enc_padata);
435 	padata_free(pcrypt_dec_padata);
436 
437 	crypto_unregister_template(&pcrypt_tmpl);
438 }
439 
440 module_init(pcrypt_init);
441 module_exit(pcrypt_exit);
442 
443 MODULE_LICENSE("GPL");
444 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
445 MODULE_DESCRIPTION("Parallel crypto wrapper");
446