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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/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 |
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