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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 <[email protected]>
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 if (err == -EINPROGRESS)
73 return;
74
75 padata->info = err;
76
77 padata_do_serial(padata);
78}
79
80static void pcrypt_aead_enc(struct padata_priv *padata)
81{
82 struct pcrypt_request *preq = pcrypt_padata_request(padata);
83 struct aead_request *req = pcrypt_request_ctx(preq);
84 int ret;
85
86 ret = crypto_aead_encrypt(req);
87
88 if (ret == -EINPROGRESS || ret == -EBUSY)
89 return;
90
91 padata->info = ret;
92 padata_do_serial(padata);
93}
94
95static int pcrypt_aead_encrypt(struct aead_request *req)
96{
97 int err;
98 struct pcrypt_request *preq = aead_request_ctx(req);
99 struct aead_request *creq = pcrypt_request_ctx(preq);
100 struct padata_priv *padata = pcrypt_request_padata(preq);
101 struct crypto_aead *aead = crypto_aead_reqtfm(req);
102 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
103 u32 flags = aead_request_flags(req);
104 struct pcrypt_instance_ctx *ictx;
105
106 ictx = pcrypt_tfm_ictx(aead);
107
108 memset(padata, 0, sizeof(struct padata_priv));
109
110 padata->parallel = pcrypt_aead_enc;
111 padata->serial = pcrypt_aead_serial;
112
113 aead_request_set_tfm(creq, ctx->child);
114 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
115 pcrypt_aead_done, req);
116 aead_request_set_crypt(creq, req->src, req->dst,
117 req->cryptlen, req->iv);
118 aead_request_set_ad(creq, req->assoclen);
119
120 err = padata_do_parallel(ictx->psenc, padata, &ctx->cb_cpu);
121 if (!err)
122 return -EINPROGRESS;
123 if (err == -EBUSY) {
124 /* try non-parallel mode */
125 aead_request_set_callback(creq, flags, req->base.complete,
126 req->base.data);
127 return crypto_aead_encrypt(creq);
128 }
129
130 return err;
131}
132
133static void pcrypt_aead_dec(struct padata_priv *padata)
134{
135 struct pcrypt_request *preq = pcrypt_padata_request(padata);
136 struct aead_request *req = pcrypt_request_ctx(preq);
137 int ret;
138
139 ret = crypto_aead_decrypt(req);
140
141 if (ret == -EINPROGRESS || ret == -EBUSY)
142 return;
143
144 padata->info = ret;
145 padata_do_serial(padata);
146}
147
148static int pcrypt_aead_decrypt(struct aead_request *req)
149{
150 int err;
151 struct pcrypt_request *preq = aead_request_ctx(req);
152 struct aead_request *creq = pcrypt_request_ctx(preq);
153 struct padata_priv *padata = pcrypt_request_padata(preq);
154 struct crypto_aead *aead = crypto_aead_reqtfm(req);
155 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
156 u32 flags = aead_request_flags(req);
157 struct pcrypt_instance_ctx *ictx;
158
159 ictx = pcrypt_tfm_ictx(aead);
160
161 memset(padata, 0, sizeof(struct padata_priv));
162
163 padata->parallel = pcrypt_aead_dec;
164 padata->serial = pcrypt_aead_serial;
165
166 aead_request_set_tfm(creq, ctx->child);
167 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
168 pcrypt_aead_done, req);
169 aead_request_set_crypt(creq, req->src, req->dst,
170 req->cryptlen, req->iv);
171 aead_request_set_ad(creq, req->assoclen);
172
173 err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu);
174 if (!err)
175 return -EINPROGRESS;
176 if (err == -EBUSY) {
177 /* try non-parallel mode */
178 aead_request_set_callback(creq, flags, req->base.complete,
179 req->base.data);
180 return crypto_aead_decrypt(creq);
181 }
182
183 return err;
184}
185
186static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
187{
188 int cpu_index;
189 struct aead_instance *inst = aead_alg_instance(tfm);
190 struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
191 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
192 struct crypto_aead *cipher;
193
194 cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
195 cpumask_weight(cpu_online_mask);
196
197 ctx->cb_cpu = cpumask_nth(cpu_index, cpu_online_mask);
198 cipher = crypto_spawn_aead(&ictx->spawn);
199
200 if (IS_ERR(cipher))
201 return PTR_ERR(cipher);
202
203 ctx->child = cipher;
204 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
205 sizeof(struct aead_request) +
206 crypto_aead_reqsize(cipher));
207
208 return 0;
209}
210
211static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
212{
213 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
214
215 crypto_free_aead(ctx->child);
216}
217
218static void pcrypt_free(struct aead_instance *inst)
219{
220 struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);
221
222 crypto_drop_aead(&ctx->spawn);
223 padata_free_shell(ctx->psdec);
224 padata_free_shell(ctx->psenc);
225 kfree(inst);
226}
227
228static int pcrypt_init_instance(struct crypto_instance *inst,
229 struct crypto_alg *alg)
230{
231 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
232 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
233 return -ENAMETOOLONG;
234
235 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
236
237 inst->alg.cra_priority = alg->cra_priority + 100;
238 inst->alg.cra_blocksize = alg->cra_blocksize;
239 inst->alg.cra_alignmask = alg->cra_alignmask;
240
241 return 0;
242}
243
244static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
245 struct crypto_attr_type *algt)
246{
247 struct pcrypt_instance_ctx *ctx;
248 struct aead_instance *inst;
249 struct aead_alg *alg;
250 u32 mask = crypto_algt_inherited_mask(algt);
251 int err;
252
253 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
254 if (!inst)
255 return -ENOMEM;
256
257 err = -ENOMEM;
258
259 ctx = aead_instance_ctx(inst);
260 ctx->psenc = padata_alloc_shell(pencrypt);
261 if (!ctx->psenc)
262 goto err_free_inst;
263
264 ctx->psdec = padata_alloc_shell(pdecrypt);
265 if (!ctx->psdec)
266 goto err_free_inst;
267
268 err = crypto_grab_aead(&ctx->spawn, aead_crypto_instance(inst),
269 crypto_attr_alg_name(tb[1]), 0, mask);
270 if (err)
271 goto err_free_inst;
272
273 alg = crypto_spawn_aead_alg(&ctx->spawn);
274 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
275 if (err)
276 goto err_free_inst;
277
278 inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC;
279
280 inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
281 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
282
283 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
284
285 inst->alg.init = pcrypt_aead_init_tfm;
286 inst->alg.exit = pcrypt_aead_exit_tfm;
287
288 inst->alg.setkey = pcrypt_aead_setkey;
289 inst->alg.setauthsize = pcrypt_aead_setauthsize;
290 inst->alg.encrypt = pcrypt_aead_encrypt;
291 inst->alg.decrypt = pcrypt_aead_decrypt;
292
293 inst->free = pcrypt_free;
294
295 err = aead_register_instance(tmpl, inst);
296 if (err) {
297err_free_inst:
298 pcrypt_free(inst);
299 }
300 return err;
301}
302
303static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
304{
305 struct crypto_attr_type *algt;
306
307 algt = crypto_get_attr_type(tb);
308 if (IS_ERR(algt))
309 return PTR_ERR(algt);
310
311 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
312 case CRYPTO_ALG_TYPE_AEAD:
313 return pcrypt_create_aead(tmpl, tb, algt);
314 }
315
316 return -EINVAL;
317}
318
319static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
320{
321 int ret;
322
323 pinst->kobj.kset = pcrypt_kset;
324 ret = kobject_add(&pinst->kobj, NULL, "%s", name);
325 if (!ret)
326 kobject_uevent(&pinst->kobj, KOBJ_ADD);
327
328 return ret;
329}
330
331static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)
332{
333 int ret = -ENOMEM;
334
335 *pinst = padata_alloc(name);
336 if (!*pinst)
337 return ret;
338
339 ret = pcrypt_sysfs_add(*pinst, name);
340 if (ret)
341 padata_free(*pinst);
342
343 return ret;
344}
345
346static struct crypto_template pcrypt_tmpl = {
347 .name = "pcrypt",
348 .create = pcrypt_create,
349 .module = THIS_MODULE,
350};
351
352static int __init pcrypt_init(void)
353{
354 int err = -ENOMEM;
355
356 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
357 if (!pcrypt_kset)
358 goto err;
359
360 err = pcrypt_init_padata(&pencrypt, "pencrypt");
361 if (err)
362 goto err_unreg_kset;
363
364 err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
365 if (err)
366 goto err_deinit_pencrypt;
367
368 return crypto_register_template(&pcrypt_tmpl);
369
370err_deinit_pencrypt:
371 padata_free(pencrypt);
372err_unreg_kset:
373 kset_unregister(pcrypt_kset);
374err:
375 return err;
376}
377
378static void __exit pcrypt_exit(void)
379{
380 crypto_unregister_template(&pcrypt_tmpl);
381
382 padata_free(pencrypt);
383 padata_free(pdecrypt);
384
385 kset_unregister(pcrypt_kset);
386}
387
388module_init(pcrypt_init);
389module_exit(pcrypt_exit);
390
391MODULE_LICENSE("GPL");
392MODULE_AUTHOR("Steffen Klassert <[email protected]>");
393MODULE_DESCRIPTION("Parallel crypto wrapper");
394MODULE_ALIAS_CRYPTO("pcrypt");