pcrypt.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * pcrypt - Parallel crypto wrapper.
  4 *
  5 * Copyright (C) 2009 secunet Security Networks AG
  6 * Copyright (C) 2009 Steffen Klassert <steffen.klassert@secunet.com>
  7 */
  8
  9#include <crypto/algapi.h>
 10#include <crypto/internal/aead.h>
 11#include <linux/atomic.h>
 12#include <linux/err.h>
 13#include <linux/init.h>
 14#include <linux/module.h>
 15#include <linux/slab.h>
 16#include <linux/kobject.h>
 17#include <linux/cpu.h>
 18#include <crypto/pcrypt.h>
 19
 20static struct padata_instance *pencrypt;
 21static struct padata_instance *pdecrypt;
 22static struct kset           *pcrypt_kset;
 23
 24struct pcrypt_instance_ctx {
 25	struct crypto_aead_spawn spawn;
 26	struct padata_shell *psenc;
 27	struct padata_shell *psdec;
 28	atomic_t tfm_count;
 29};
 30
 31struct pcrypt_aead_ctx {
 32	struct crypto_aead *child;
 33	unsigned int cb_cpu;
 34};
 35
 36static inline struct pcrypt_instance_ctx *pcrypt_tfm_ictx(
 37	struct crypto_aead *tfm)
 38{
 39	return aead_instance_ctx(aead_alg_instance(tfm));
 40}
 41
 42static int pcrypt_aead_setkey(struct crypto_aead *parent,
 43			      const u8 *key, unsigned int keylen)
 44{
 45	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
 46
 47	return crypto_aead_setkey(ctx->child, key, keylen);
 48}
 49
 50static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
 51				   unsigned int authsize)
 52{
 53	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
 54
 55	return crypto_aead_setauthsize(ctx->child, authsize);
 56}
 57
 58static void pcrypt_aead_serial(struct padata_priv *padata)
 59{
 60	struct pcrypt_request *preq = pcrypt_padata_request(padata);
 61	struct aead_request *req = pcrypt_request_ctx(preq);
 62
 63	aead_request_complete(req->base.data, padata->info);
 64}
 65
 66static void pcrypt_aead_done(void *data, int err)
 67{
 68	struct aead_request *req = data;
 69	struct pcrypt_request *preq = aead_request_ctx(req);
 70	struct padata_priv *padata = pcrypt_request_padata(preq);
 71
 72	padata->info = err;
 73
 74	padata_do_serial(padata);
 75}
 76
 77static void pcrypt_aead_enc(struct padata_priv *padata)
 78{
 79	struct pcrypt_request *preq = pcrypt_padata_request(padata);
 80	struct aead_request *req = pcrypt_request_ctx(preq);
 81	int ret;
 82
 83	ret = crypto_aead_encrypt(req);
 84
 85	if (ret == -EINPROGRESS)
 86		return;
 87
 88	padata->info = ret;
 89	padata_do_serial(padata);
 90}
 91
 92static int pcrypt_aead_encrypt(struct aead_request *req)
 93{
 94	int err;
 95	struct pcrypt_request *preq = aead_request_ctx(req);
 96	struct aead_request *creq = pcrypt_request_ctx(preq);
 97	struct padata_priv *padata = pcrypt_request_padata(preq);
 98	struct crypto_aead *aead = crypto_aead_reqtfm(req);
 99	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
100	u32 flags = aead_request_flags(req);
101	struct pcrypt_instance_ctx *ictx;
102
103	ictx = pcrypt_tfm_ictx(aead);
104
105	memset(padata, 0, sizeof(struct padata_priv));
106
107	padata->parallel = pcrypt_aead_enc;
108	padata->serial = pcrypt_aead_serial;
109
110	aead_request_set_tfm(creq, ctx->child);
111	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
112				  pcrypt_aead_done, req);
113	aead_request_set_crypt(creq, req->src, req->dst,
114			       req->cryptlen, req->iv);
115	aead_request_set_ad(creq, req->assoclen);
116
117	err = padata_do_parallel(ictx->psenc, padata, &ctx->cb_cpu);
118	if (!err)
119		return -EINPROGRESS;
120	if (err == -EBUSY) {
121		/* try non-parallel mode */
122		return crypto_aead_encrypt(creq);
123	}
124
125	return err;
126}
127
128static void pcrypt_aead_dec(struct padata_priv *padata)
129{
130	struct pcrypt_request *preq = pcrypt_padata_request(padata);
131	struct aead_request *req = pcrypt_request_ctx(preq);
132	int ret;
133
134	ret = crypto_aead_decrypt(req);
135
136	if (ret == -EINPROGRESS)
137		return;
138
139	padata->info = ret;
140	padata_do_serial(padata);
141}
142
143static int pcrypt_aead_decrypt(struct aead_request *req)
144{
145	int err;
146	struct pcrypt_request *preq = aead_request_ctx(req);
147	struct aead_request *creq = pcrypt_request_ctx(preq);
148	struct padata_priv *padata = pcrypt_request_padata(preq);
149	struct crypto_aead *aead = crypto_aead_reqtfm(req);
150	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
151	u32 flags = aead_request_flags(req);
152	struct pcrypt_instance_ctx *ictx;
153
154	ictx = pcrypt_tfm_ictx(aead);
155
156	memset(padata, 0, sizeof(struct padata_priv));
157
158	padata->parallel = pcrypt_aead_dec;
159	padata->serial = pcrypt_aead_serial;
160
161	aead_request_set_tfm(creq, ctx->child);
162	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
163				  pcrypt_aead_done, req);
164	aead_request_set_crypt(creq, req->src, req->dst,
165			       req->cryptlen, req->iv);
166	aead_request_set_ad(creq, req->assoclen);
167
168	err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu);
169	if (!err)
170		return -EINPROGRESS;
171	if (err == -EBUSY) {
172		/* try non-parallel mode */
173		return crypto_aead_decrypt(creq);
174	}
175
176	return err;
177}
178
179static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
180{
181	int cpu_index;
182	struct aead_instance *inst = aead_alg_instance(tfm);
183	struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
184	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
185	struct crypto_aead *cipher;
186
187	cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
188		    cpumask_weight(cpu_online_mask);
189
190	ctx->cb_cpu = cpumask_nth(cpu_index, cpu_online_mask);
191	cipher = crypto_spawn_aead(&ictx->spawn);
192
193	if (IS_ERR(cipher))
194		return PTR_ERR(cipher);
195
196	ctx->child = cipher;
197	crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
198				     sizeof(struct aead_request) +
199				     crypto_aead_reqsize(cipher));
200
201	return 0;
202}
203
204static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
205{
206	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
207
208	crypto_free_aead(ctx->child);
209}
210
211static void pcrypt_free(struct aead_instance *inst)
212{
213	struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);
214
215	crypto_drop_aead(&ctx->spawn);
216	padata_free_shell(ctx->psdec);
217	padata_free_shell(ctx->psenc);
218	kfree(inst);
219}
220
221static int pcrypt_init_instance(struct crypto_instance *inst,
222				struct crypto_alg *alg)
223{
224	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
225		     "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
226		return -ENAMETOOLONG;
227
228	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
229
230	inst->alg.cra_priority = alg->cra_priority + 100;
231	inst->alg.cra_blocksize = alg->cra_blocksize;
232	inst->alg.cra_alignmask = alg->cra_alignmask;
233
234	return 0;
235}
236
237static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
238			      struct crypto_attr_type *algt)
239{
240	struct pcrypt_instance_ctx *ctx;
241	struct aead_instance *inst;
242	struct aead_alg *alg;
243	u32 mask = crypto_algt_inherited_mask(algt);
244	int err;
245
246	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
247	if (!inst)
248		return -ENOMEM;
249
250	err = -ENOMEM;
251
252	ctx = aead_instance_ctx(inst);
253	ctx->psenc = padata_alloc_shell(pencrypt);
254	if (!ctx->psenc)
255		goto err_free_inst;
256
257	ctx->psdec = padata_alloc_shell(pdecrypt);
258	if (!ctx->psdec)
259		goto err_free_inst;
260
261	err = crypto_grab_aead(&ctx->spawn, aead_crypto_instance(inst),
262			       crypto_attr_alg_name(tb[1]), 0, mask);
263	if (err)
264		goto err_free_inst;
265
266	alg = crypto_spawn_aead_alg(&ctx->spawn);
267	err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
268	if (err)
269		goto err_free_inst;
270
271	inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC;
272
273	inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
274	inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
275
276	inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
277
278	inst->alg.init = pcrypt_aead_init_tfm;
279	inst->alg.exit = pcrypt_aead_exit_tfm;
280
281	inst->alg.setkey = pcrypt_aead_setkey;
282	inst->alg.setauthsize = pcrypt_aead_setauthsize;
283	inst->alg.encrypt = pcrypt_aead_encrypt;
284	inst->alg.decrypt = pcrypt_aead_decrypt;
285
286	inst->free = pcrypt_free;
287
288	err = aead_register_instance(tmpl, inst);
289	if (err) {
290err_free_inst:
291		pcrypt_free(inst);
292	}
293	return err;
294}
295
296static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
297{
298	struct crypto_attr_type *algt;
299
300	algt = crypto_get_attr_type(tb);
301	if (IS_ERR(algt))
302		return PTR_ERR(algt);
303
304	switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
305	case CRYPTO_ALG_TYPE_AEAD:
306		return pcrypt_create_aead(tmpl, tb, algt);
307	}
308
309	return -EINVAL;
310}
311
312static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
313{
314	int ret;
315
316	pinst->kobj.kset = pcrypt_kset;
317	ret = kobject_add(&pinst->kobj, NULL, "%s", name);
318	if (!ret)
319		kobject_uevent(&pinst->kobj, KOBJ_ADD);
320
321	return ret;
322}
323
324static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)
325{
326	int ret = -ENOMEM;
327
328	*pinst = padata_alloc(name);
329	if (!*pinst)
330		return ret;
331
332	ret = pcrypt_sysfs_add(*pinst, name);
333	if (ret)
334		padata_free(*pinst);
335
336	return ret;
337}
338
339static struct crypto_template pcrypt_tmpl = {
340	.name = "pcrypt",
341	.create = pcrypt_create,
342	.module = THIS_MODULE,
343};
344
345static int __init pcrypt_init(void)
346{
347	int err = -ENOMEM;
348
349	pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
350	if (!pcrypt_kset)
351		goto err;
352
353	err = pcrypt_init_padata(&pencrypt, "pencrypt");
354	if (err)
355		goto err_unreg_kset;
356
357	err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
358	if (err)
359		goto err_deinit_pencrypt;
360
361	return crypto_register_template(&pcrypt_tmpl);
362
363err_deinit_pencrypt:
364	padata_free(pencrypt);
365err_unreg_kset:
366	kset_unregister(pcrypt_kset);
367err:
368	return err;
369}
370
371static void __exit pcrypt_exit(void)
372{
373	crypto_unregister_template(&pcrypt_tmpl);
374
375	padata_free(pencrypt);
376	padata_free(pdecrypt);
377
378	kset_unregister(pcrypt_kset);
379}
380
381module_init(pcrypt_init);
382module_exit(pcrypt_exit);
383
384MODULE_LICENSE("GPL");
385MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
386MODULE_DESCRIPTION("Parallel crypto wrapper");
387MODULE_ALIAS_CRYPTO("pcrypt");