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/err.h>
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/slab.h>
27 #include <crypto/pcrypt.h>
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;
34 struct pcrypt_instance_ctx {
35 struct crypto_spawn spawn;
36 unsigned int tfm_count;
39 struct pcrypt_aead_ctx {
40 struct crypto_aead *child;
44 static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,
45 struct padata_instance *pinst)
47 unsigned int cpu_index, cpu, i;
51 if (cpumask_test_cpu(cpu, cpu_active_mask))
54 cpu_index = cpu % cpumask_weight(cpu_active_mask);
56 cpu = cpumask_first(cpu_active_mask);
57 for (i = 0; i < cpu_index; i++)
58 cpu = cpumask_next(cpu, cpu_active_mask);
63 return padata_do_parallel(pinst, padata, cpu);
66 static int pcrypt_aead_setkey(struct crypto_aead *parent,
67 const u8 *key, unsigned int keylen)
69 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
71 return crypto_aead_setkey(ctx->child, key, keylen);
74 static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
75 unsigned int authsize)
77 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
79 return crypto_aead_setauthsize(ctx->child, authsize);
82 static void pcrypt_aead_serial(struct padata_priv *padata)
84 struct pcrypt_request *preq = pcrypt_padata_request(padata);
85 struct aead_request *req = pcrypt_request_ctx(preq);
87 aead_request_complete(req->base.data, padata->info);
90 static void pcrypt_aead_giv_serial(struct padata_priv *padata)
92 struct pcrypt_request *preq = pcrypt_padata_request(padata);
93 struct aead_givcrypt_request *req = pcrypt_request_ctx(preq);
95 aead_request_complete(req->areq.base.data, padata->info);
98 static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
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);
105 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
107 padata_do_serial(padata);
110 static void pcrypt_aead_enc(struct padata_priv *padata)
112 struct pcrypt_request *preq = pcrypt_padata_request(padata);
113 struct aead_request *req = pcrypt_request_ctx(preq);
115 padata->info = crypto_aead_encrypt(req);
117 if (padata->info == -EINPROGRESS)
120 padata_do_serial(padata);
123 static int pcrypt_aead_encrypt(struct aead_request *req)
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);
133 memset(padata, 0, sizeof(struct padata_priv));
135 padata->parallel = pcrypt_aead_enc;
136 padata->serial = pcrypt_aead_serial;
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);
145 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);
149 err = crypto_aead_encrypt(creq);
154 static void pcrypt_aead_dec(struct padata_priv *padata)
156 struct pcrypt_request *preq = pcrypt_padata_request(padata);
157 struct aead_request *req = pcrypt_request_ctx(preq);
159 padata->info = crypto_aead_decrypt(req);
161 if (padata->info == -EINPROGRESS)
164 padata_do_serial(padata);
167 static int pcrypt_aead_decrypt(struct aead_request *req)
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);
177 memset(padata, 0, sizeof(struct padata_priv));
179 padata->parallel = pcrypt_aead_dec;
180 padata->serial = pcrypt_aead_serial;
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);
189 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_dec_padata);
193 err = crypto_aead_decrypt(creq);
198 static void pcrypt_aead_givenc(struct padata_priv *padata)
200 struct pcrypt_request *preq = pcrypt_padata_request(padata);
201 struct aead_givcrypt_request *req = pcrypt_request_ctx(preq);
203 padata->info = crypto_aead_givencrypt(req);
205 if (padata->info == -EINPROGRESS)
208 padata_do_serial(padata);
211 static int pcrypt_aead_givencrypt(struct aead_givcrypt_request *req)
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);
222 memset(padata, 0, sizeof(struct padata_priv));
224 padata->parallel = pcrypt_aead_givenc;
225 padata->serial = pcrypt_aead_giv_serial;
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);
235 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);
239 err = crypto_aead_givencrypt(creq);
244 static int pcrypt_aead_init_tfm(struct crypto_tfm *tfm)
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;
254 cpu_index = ictx->tfm_count % cpumask_weight(cpu_active_mask);
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);
260 cipher = crypto_spawn_aead(crypto_instance_ctx(inst));
263 return PTR_ERR(cipher);
266 tfm->crt_aead.reqsize = sizeof(struct pcrypt_request)
267 + sizeof(struct aead_givcrypt_request)
268 + crypto_aead_reqsize(cipher);
273 static void pcrypt_aead_exit_tfm(struct crypto_tfm *tfm)
275 struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm);
277 crypto_free_aead(ctx->child);
280 static struct crypto_instance *pcrypt_alloc_instance(struct crypto_alg *alg)
282 struct crypto_instance *inst;
283 struct pcrypt_instance_ctx *ctx;
286 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
288 inst = ERR_PTR(-ENOMEM);
293 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
294 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
297 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
299 ctx = crypto_instance_ctx(inst);
300 err = crypto_init_spawn(&ctx->spawn, alg, inst,
301 CRYPTO_ALG_TYPE_MASK);
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;
318 static struct crypto_instance *pcrypt_alloc_aead(struct rtattr **tb)
320 struct crypto_instance *inst;
321 struct crypto_alg *alg;
322 struct crypto_attr_type *algt;
324 algt = crypto_get_attr_type(tb);
326 alg = crypto_get_attr_alg(tb, algt->type,
327 (algt->mask & CRYPTO_ALG_TYPE_MASK));
329 return ERR_CAST(alg);
331 inst = pcrypt_alloc_instance(alg);
335 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
336 inst->alg.cra_type = &crypto_aead_type;
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;
342 inst->alg.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
344 inst->alg.cra_init = pcrypt_aead_init_tfm;
345 inst->alg.cra_exit = pcrypt_aead_exit_tfm;
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;
358 static struct crypto_instance *pcrypt_alloc(struct rtattr **tb)
360 struct crypto_attr_type *algt;
362 algt = crypto_get_attr_type(tb);
364 return ERR_CAST(algt);
366 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
367 case CRYPTO_ALG_TYPE_AEAD:
368 return pcrypt_alloc_aead(tb);
371 return ERR_PTR(-EINVAL);
374 static void pcrypt_free(struct crypto_instance *inst)
376 struct pcrypt_instance_ctx *ctx = crypto_instance_ctx(inst);
378 crypto_drop_spawn(&ctx->spawn);
382 static struct crypto_template pcrypt_tmpl = {
384 .alloc = pcrypt_alloc,
386 .module = THIS_MODULE,
389 static int __init pcrypt_init(void)
391 encwq = create_workqueue("pencrypt");
395 decwq = create_workqueue("pdecrypt");
397 goto err_destroy_encwq;
400 pcrypt_enc_padata = padata_alloc(cpu_possible_mask, encwq);
401 if (!pcrypt_enc_padata)
402 goto err_destroy_decwq;
404 pcrypt_dec_padata = padata_alloc(cpu_possible_mask, decwq);
405 if (!pcrypt_dec_padata)
406 goto err_free_padata;
408 padata_start(pcrypt_enc_padata);
409 padata_start(pcrypt_dec_padata);
411 return crypto_register_template(&pcrypt_tmpl);
414 padata_free(pcrypt_enc_padata);
417 destroy_workqueue(decwq);
420 destroy_workqueue(encwq);
426 static void __exit pcrypt_exit(void)
428 padata_stop(pcrypt_enc_padata);
429 padata_stop(pcrypt_dec_padata);
431 destroy_workqueue(encwq);
432 destroy_workqueue(decwq);
434 padata_free(pcrypt_enc_padata);
435 padata_free(pcrypt_dec_padata);
437 crypto_unregister_template(&pcrypt_tmpl);
440 module_init(pcrypt_init);
441 module_exit(pcrypt_exit);
443 MODULE_LICENSE("GPL");
444 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
445 MODULE_DESCRIPTION("Parallel crypto wrapper");