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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
29static struct padata_instance *pcrypt_enc_padata;
30static struct padata_instance *pcrypt_dec_padata;
31static struct workqueue_struct *encwq;
32static struct workqueue_struct *decwq;
33
34struct pcrypt_instance_ctx {
35 struct crypto_spawn spawn;
36 unsigned int tfm_count;
37};
38
39struct pcrypt_aead_ctx {
40 struct crypto_aead *child;
41 unsigned int cb_cpu;
42};
43
44static 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
62out:
63 return padata_do_parallel(pinst, padata, cpu);
64}
65
66static 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
74static 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
82static 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
90static 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
98static 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
110static 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
123static 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
154static 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
167static 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
198static 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
211static 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
244static 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
273static 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
280static 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
309out:
310 return inst;
311
312out_free_inst:
313 kfree(inst);
314 inst = ERR_PTR(err);
315 goto out;
316}
317
318static struct crypto_instance *pcrypt_alloc_aead(struct rtattr **tb,
319 u32 type, u32 mask)
320{
321 struct crypto_instance *inst;
322 struct crypto_alg *alg;
323
324 alg = crypto_get_attr_alg(tb, type, (mask & CRYPTO_ALG_TYPE_MASK));
325 if (IS_ERR(alg))
326 return ERR_CAST(alg);
327
328 inst = pcrypt_alloc_instance(alg);
329 if (IS_ERR(inst))
330 goto out_put_alg;
331
332 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
333 inst->alg.cra_type = &crypto_aead_type;
334
335 inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
336 inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
337 inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
338
339 inst->alg.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
340
341 inst->alg.cra_init = pcrypt_aead_init_tfm;
342 inst->alg.cra_exit = pcrypt_aead_exit_tfm;
343
344 inst->alg.cra_aead.setkey = pcrypt_aead_setkey;
345 inst->alg.cra_aead.setauthsize = pcrypt_aead_setauthsize;
346 inst->alg.cra_aead.encrypt = pcrypt_aead_encrypt;
347 inst->alg.cra_aead.decrypt = pcrypt_aead_decrypt;
348 inst->alg.cra_aead.givencrypt = pcrypt_aead_givencrypt;
349
350out_put_alg:
351 crypto_mod_put(alg);
352 return inst;
353}
354
355static struct crypto_instance *pcrypt_alloc(struct rtattr **tb)
356{
357 struct crypto_attr_type *algt;
358
359 algt = crypto_get_attr_type(tb);
360 if (IS_ERR(algt))
361 return ERR_CAST(algt);
362
363 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
364 case CRYPTO_ALG_TYPE_AEAD:
365 return pcrypt_alloc_aead(tb, algt->type, algt->mask);
366 }
367
368 return ERR_PTR(-EINVAL);
369}
370
371static void pcrypt_free(struct crypto_instance *inst)
372{
373 struct pcrypt_instance_ctx *ctx = crypto_instance_ctx(inst);
374
375 crypto_drop_spawn(&ctx->spawn);
376 kfree(inst);
377}
378
379static struct crypto_template pcrypt_tmpl = {
380 .name = "pcrypt",
381 .alloc = pcrypt_alloc,
382 .free = pcrypt_free,
383 .module = THIS_MODULE,
384};
385
386static int __init pcrypt_init(void)
387{
388 encwq = create_workqueue("pencrypt");
389 if (!encwq)
390 goto err;
391
392 decwq = create_workqueue("pdecrypt");
393 if (!decwq)
394 goto err_destroy_encwq;
395
396
397 pcrypt_enc_padata = padata_alloc(cpu_possible_mask, encwq);
398 if (!pcrypt_enc_padata)
399 goto err_destroy_decwq;
400
401 pcrypt_dec_padata = padata_alloc(cpu_possible_mask, decwq);
402 if (!pcrypt_dec_padata)
403 goto err_free_padata;
404
405 padata_start(pcrypt_enc_padata);
406 padata_start(pcrypt_dec_padata);
407
408 return crypto_register_template(&pcrypt_tmpl);
409
410err_free_padata:
411 padata_free(pcrypt_enc_padata);
412
413err_destroy_decwq:
414 destroy_workqueue(decwq);
415
416err_destroy_encwq:
417 destroy_workqueue(encwq);
418
419err:
420 return -ENOMEM;
421}
422
423static void __exit pcrypt_exit(void)
424{
425 padata_stop(pcrypt_enc_padata);
426 padata_stop(pcrypt_dec_padata);
427
428 destroy_workqueue(encwq);
429 destroy_workqueue(decwq);
430
431 padata_free(pcrypt_enc_padata);
432 padata_free(pcrypt_dec_padata);
433
434 crypto_unregister_template(&pcrypt_tmpl);
435}
436
437module_init(pcrypt_init);
438module_exit(pcrypt_exit);
439
440MODULE_LICENSE("GPL");
441MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
442MODULE_DESCRIPTION("Parallel crypto wrapper");
443
