Loading...
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, 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_first(cpu_online_mask);
191 for (cpu = 0; cpu < cpu_index; cpu++)
192 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
193
194 cipher = crypto_spawn_aead(&ictx->spawn);
195
196 if (IS_ERR(cipher))
197 return PTR_ERR(cipher);
198
199 ctx->child = cipher;
200 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
201 sizeof(struct aead_request) +
202 crypto_aead_reqsize(cipher));
203
204 return 0;
205}
206
207static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
208{
209 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
210
211 crypto_free_aead(ctx->child);
212}
213
214static void pcrypt_free(struct aead_instance *inst)
215{
216 struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);
217
218 crypto_drop_aead(&ctx->spawn);
219 padata_free_shell(ctx->psdec);
220 padata_free_shell(ctx->psenc);
221 kfree(inst);
222}
223
224static int pcrypt_init_instance(struct crypto_instance *inst,
225 struct crypto_alg *alg)
226{
227 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
228 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
229 return -ENAMETOOLONG;
230
231 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
232
233 inst->alg.cra_priority = alg->cra_priority + 100;
234 inst->alg.cra_blocksize = alg->cra_blocksize;
235 inst->alg.cra_alignmask = alg->cra_alignmask;
236
237 return 0;
238}
239
240static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
241 struct crypto_attr_type *algt)
242{
243 struct pcrypt_instance_ctx *ctx;
244 struct aead_instance *inst;
245 struct aead_alg *alg;
246 u32 mask = crypto_algt_inherited_mask(algt);
247 int err;
248
249 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
250 if (!inst)
251 return -ENOMEM;
252
253 err = -ENOMEM;
254
255 ctx = aead_instance_ctx(inst);
256 ctx->psenc = padata_alloc_shell(pencrypt);
257 if (!ctx->psenc)
258 goto err_free_inst;
259
260 ctx->psdec = padata_alloc_shell(pdecrypt);
261 if (!ctx->psdec)
262 goto err_free_inst;
263
264 err = crypto_grab_aead(&ctx->spawn, aead_crypto_instance(inst),
265 crypto_attr_alg_name(tb[1]), 0, mask);
266 if (err)
267 goto err_free_inst;
268
269 alg = crypto_spawn_aead_alg(&ctx->spawn);
270 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
271 if (err)
272 goto err_free_inst;
273
274 inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC;
275
276 inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
277 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
278
279 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
280
281 inst->alg.init = pcrypt_aead_init_tfm;
282 inst->alg.exit = pcrypt_aead_exit_tfm;
283
284 inst->alg.setkey = pcrypt_aead_setkey;
285 inst->alg.setauthsize = pcrypt_aead_setauthsize;
286 inst->alg.encrypt = pcrypt_aead_encrypt;
287 inst->alg.decrypt = pcrypt_aead_decrypt;
288
289 inst->free = pcrypt_free;
290
291 err = aead_register_instance(tmpl, inst);
292 if (err) {
293err_free_inst:
294 pcrypt_free(inst);
295 }
296 return err;
297}
298
299static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
300{
301 struct crypto_attr_type *algt;
302
303 algt = crypto_get_attr_type(tb);
304 if (IS_ERR(algt))
305 return PTR_ERR(algt);
306
307 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
308 case CRYPTO_ALG_TYPE_AEAD:
309 return pcrypt_create_aead(tmpl, tb, algt);
310 }
311
312 return -EINVAL;
313}
314
315static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
316{
317 int ret;
318
319 pinst->kobj.kset = pcrypt_kset;
320 ret = kobject_add(&pinst->kobj, NULL, "%s", name);
321 if (!ret)
322 kobject_uevent(&pinst->kobj, KOBJ_ADD);
323
324 return ret;
325}
326
327static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)
328{
329 int ret = -ENOMEM;
330
331 *pinst = padata_alloc(name);
332 if (!*pinst)
333 return ret;
334
335 ret = pcrypt_sysfs_add(*pinst, name);
336 if (ret)
337 padata_free(*pinst);
338
339 return ret;
340}
341
342static struct crypto_template pcrypt_tmpl = {
343 .name = "pcrypt",
344 .create = pcrypt_create,
345 .module = THIS_MODULE,
346};
347
348static int __init pcrypt_init(void)
349{
350 int err = -ENOMEM;
351
352 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
353 if (!pcrypt_kset)
354 goto err;
355
356 err = pcrypt_init_padata(&pencrypt, "pencrypt");
357 if (err)
358 goto err_unreg_kset;
359
360 err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
361 if (err)
362 goto err_deinit_pencrypt;
363
364 return crypto_register_template(&pcrypt_tmpl);
365
366err_deinit_pencrypt:
367 padata_free(pencrypt);
368err_unreg_kset:
369 kset_unregister(pcrypt_kset);
370err:
371 return err;
372}
373
374static void __exit pcrypt_exit(void)
375{
376 crypto_unregister_template(&pcrypt_tmpl);
377
378 padata_free(pencrypt);
379 padata_free(pdecrypt);
380
381 kset_unregister(pcrypt_kset);
382}
383
384subsys_initcall(pcrypt_init);
385module_exit(pcrypt_exit);
386
387MODULE_LICENSE("GPL");
388MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
389MODULE_DESCRIPTION("Parallel crypto wrapper");
390MODULE_ALIAS_CRYPTO("pcrypt");
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/atomic.h>
24#include <linux/err.h>
25#include <linux/init.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/notifier.h>
29#include <linux/kobject.h>
30#include <linux/cpu.h>
31#include <crypto/pcrypt.h>
32
33struct padata_pcrypt {
34 struct padata_instance *pinst;
35 struct workqueue_struct *wq;
36
37 /*
38 * Cpumask for callback CPUs. It should be
39 * equal to serial cpumask of corresponding padata instance,
40 * so it is updated when padata notifies us about serial
41 * cpumask change.
42 *
43 * cb_cpumask is protected by RCU. This fact prevents us from
44 * using cpumask_var_t directly because the actual type of
45 * cpumsak_var_t depends on kernel configuration(particularly on
46 * CONFIG_CPUMASK_OFFSTACK macro). Depending on the configuration
47 * cpumask_var_t may be either a pointer to the struct cpumask
48 * or a variable allocated on the stack. Thus we can not safely use
49 * cpumask_var_t with RCU operations such as rcu_assign_pointer or
50 * rcu_dereference. So cpumask_var_t is wrapped with struct
51 * pcrypt_cpumask which makes possible to use it with RCU.
52 */
53 struct pcrypt_cpumask {
54 cpumask_var_t mask;
55 } *cb_cpumask;
56 struct notifier_block nblock;
57};
58
59static struct padata_pcrypt pencrypt;
60static struct padata_pcrypt pdecrypt;
61static struct kset *pcrypt_kset;
62
63struct pcrypt_instance_ctx {
64 struct crypto_aead_spawn spawn;
65 atomic_t tfm_count;
66};
67
68struct pcrypt_aead_ctx {
69 struct crypto_aead *child;
70 unsigned int cb_cpu;
71};
72
73static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,
74 struct padata_pcrypt *pcrypt)
75{
76 unsigned int cpu_index, cpu, i;
77 struct pcrypt_cpumask *cpumask;
78
79 cpu = *cb_cpu;
80
81 rcu_read_lock_bh();
82 cpumask = rcu_dereference_bh(pcrypt->cb_cpumask);
83 if (cpumask_test_cpu(cpu, cpumask->mask))
84 goto out;
85
86 if (!cpumask_weight(cpumask->mask))
87 goto out;
88
89 cpu_index = cpu % cpumask_weight(cpumask->mask);
90
91 cpu = cpumask_first(cpumask->mask);
92 for (i = 0; i < cpu_index; i++)
93 cpu = cpumask_next(cpu, cpumask->mask);
94
95 *cb_cpu = cpu;
96
97out:
98 rcu_read_unlock_bh();
99 return padata_do_parallel(pcrypt->pinst, padata, cpu);
100}
101
102static int pcrypt_aead_setkey(struct crypto_aead *parent,
103 const u8 *key, unsigned int keylen)
104{
105 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
106
107 return crypto_aead_setkey(ctx->child, key, keylen);
108}
109
110static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
111 unsigned int authsize)
112{
113 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
114
115 return crypto_aead_setauthsize(ctx->child, authsize);
116}
117
118static void pcrypt_aead_serial(struct padata_priv *padata)
119{
120 struct pcrypt_request *preq = pcrypt_padata_request(padata);
121 struct aead_request *req = pcrypt_request_ctx(preq);
122
123 aead_request_complete(req->base.data, padata->info);
124}
125
126static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
127{
128 struct aead_request *req = areq->data;
129 struct pcrypt_request *preq = aead_request_ctx(req);
130 struct padata_priv *padata = pcrypt_request_padata(preq);
131
132 padata->info = err;
133 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
134
135 padata_do_serial(padata);
136}
137
138static void pcrypt_aead_enc(struct padata_priv *padata)
139{
140 struct pcrypt_request *preq = pcrypt_padata_request(padata);
141 struct aead_request *req = pcrypt_request_ctx(preq);
142
143 padata->info = crypto_aead_encrypt(req);
144
145 if (padata->info == -EINPROGRESS)
146 return;
147
148 padata_do_serial(padata);
149}
150
151static int pcrypt_aead_encrypt(struct aead_request *req)
152{
153 int err;
154 struct pcrypt_request *preq = aead_request_ctx(req);
155 struct aead_request *creq = pcrypt_request_ctx(preq);
156 struct padata_priv *padata = pcrypt_request_padata(preq);
157 struct crypto_aead *aead = crypto_aead_reqtfm(req);
158 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
159 u32 flags = aead_request_flags(req);
160
161 memset(padata, 0, sizeof(struct padata_priv));
162
163 padata->parallel = pcrypt_aead_enc;
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 = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt);
174 if (!err)
175 return -EINPROGRESS;
176
177 return err;
178}
179
180static void pcrypt_aead_dec(struct padata_priv *padata)
181{
182 struct pcrypt_request *preq = pcrypt_padata_request(padata);
183 struct aead_request *req = pcrypt_request_ctx(preq);
184
185 padata->info = crypto_aead_decrypt(req);
186
187 if (padata->info == -EINPROGRESS)
188 return;
189
190 padata_do_serial(padata);
191}
192
193static int pcrypt_aead_decrypt(struct aead_request *req)
194{
195 int err;
196 struct pcrypt_request *preq = aead_request_ctx(req);
197 struct aead_request *creq = pcrypt_request_ctx(preq);
198 struct padata_priv *padata = pcrypt_request_padata(preq);
199 struct crypto_aead *aead = crypto_aead_reqtfm(req);
200 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
201 u32 flags = aead_request_flags(req);
202
203 memset(padata, 0, sizeof(struct padata_priv));
204
205 padata->parallel = pcrypt_aead_dec;
206 padata->serial = pcrypt_aead_serial;
207
208 aead_request_set_tfm(creq, ctx->child);
209 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
210 pcrypt_aead_done, req);
211 aead_request_set_crypt(creq, req->src, req->dst,
212 req->cryptlen, req->iv);
213 aead_request_set_ad(creq, req->assoclen);
214
215 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pdecrypt);
216 if (!err)
217 return -EINPROGRESS;
218
219 return err;
220}
221
222static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
223{
224 int cpu, cpu_index;
225 struct aead_instance *inst = aead_alg_instance(tfm);
226 struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
227 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
228 struct crypto_aead *cipher;
229
230 cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
231 cpumask_weight(cpu_online_mask);
232
233 ctx->cb_cpu = cpumask_first(cpu_online_mask);
234 for (cpu = 0; cpu < cpu_index; cpu++)
235 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
236
237 cipher = crypto_spawn_aead(&ictx->spawn);
238
239 if (IS_ERR(cipher))
240 return PTR_ERR(cipher);
241
242 ctx->child = cipher;
243 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
244 sizeof(struct aead_request) +
245 crypto_aead_reqsize(cipher));
246
247 return 0;
248}
249
250static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
251{
252 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
253
254 crypto_free_aead(ctx->child);
255}
256
257static int pcrypt_init_instance(struct crypto_instance *inst,
258 struct crypto_alg *alg)
259{
260 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
261 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
262 return -ENAMETOOLONG;
263
264 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
265
266 inst->alg.cra_priority = alg->cra_priority + 100;
267 inst->alg.cra_blocksize = alg->cra_blocksize;
268 inst->alg.cra_alignmask = alg->cra_alignmask;
269
270 return 0;
271}
272
273static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
274 u32 type, u32 mask)
275{
276 struct pcrypt_instance_ctx *ctx;
277 struct crypto_attr_type *algt;
278 struct aead_instance *inst;
279 struct aead_alg *alg;
280 const char *name;
281 int err;
282
283 algt = crypto_get_attr_type(tb);
284 if (IS_ERR(algt))
285 return PTR_ERR(algt);
286
287 name = crypto_attr_alg_name(tb[1]);
288 if (IS_ERR(name))
289 return PTR_ERR(name);
290
291 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
292 if (!inst)
293 return -ENOMEM;
294
295 ctx = aead_instance_ctx(inst);
296 crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst));
297
298 err = crypto_grab_aead(&ctx->spawn, name, 0, 0);
299 if (err)
300 goto out_free_inst;
301
302 alg = crypto_spawn_aead_alg(&ctx->spawn);
303 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
304 if (err)
305 goto out_drop_aead;
306
307 inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC;
308
309 inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
310 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
311
312 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
313
314 inst->alg.init = pcrypt_aead_init_tfm;
315 inst->alg.exit = pcrypt_aead_exit_tfm;
316
317 inst->alg.setkey = pcrypt_aead_setkey;
318 inst->alg.setauthsize = pcrypt_aead_setauthsize;
319 inst->alg.encrypt = pcrypt_aead_encrypt;
320 inst->alg.decrypt = pcrypt_aead_decrypt;
321
322 err = aead_register_instance(tmpl, inst);
323 if (err)
324 goto out_drop_aead;
325
326out:
327 return err;
328
329out_drop_aead:
330 crypto_drop_aead(&ctx->spawn);
331out_free_inst:
332 kfree(inst);
333 goto out;
334}
335
336static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
337{
338 struct crypto_attr_type *algt;
339
340 algt = crypto_get_attr_type(tb);
341 if (IS_ERR(algt))
342 return PTR_ERR(algt);
343
344 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
345 case CRYPTO_ALG_TYPE_AEAD:
346 return pcrypt_create_aead(tmpl, tb, algt->type, algt->mask);
347 }
348
349 return -EINVAL;
350}
351
352static void pcrypt_free(struct crypto_instance *inst)
353{
354 struct pcrypt_instance_ctx *ctx = crypto_instance_ctx(inst);
355
356 crypto_drop_aead(&ctx->spawn);
357 kfree(inst);
358}
359
360static int pcrypt_cpumask_change_notify(struct notifier_block *self,
361 unsigned long val, void *data)
362{
363 struct padata_pcrypt *pcrypt;
364 struct pcrypt_cpumask *new_mask, *old_mask;
365 struct padata_cpumask *cpumask = (struct padata_cpumask *)data;
366
367 if (!(val & PADATA_CPU_SERIAL))
368 return 0;
369
370 pcrypt = container_of(self, struct padata_pcrypt, nblock);
371 new_mask = kmalloc(sizeof(*new_mask), GFP_KERNEL);
372 if (!new_mask)
373 return -ENOMEM;
374 if (!alloc_cpumask_var(&new_mask->mask, GFP_KERNEL)) {
375 kfree(new_mask);
376 return -ENOMEM;
377 }
378
379 old_mask = pcrypt->cb_cpumask;
380
381 cpumask_copy(new_mask->mask, cpumask->cbcpu);
382 rcu_assign_pointer(pcrypt->cb_cpumask, new_mask);
383 synchronize_rcu_bh();
384
385 free_cpumask_var(old_mask->mask);
386 kfree(old_mask);
387 return 0;
388}
389
390static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
391{
392 int ret;
393
394 pinst->kobj.kset = pcrypt_kset;
395 ret = kobject_add(&pinst->kobj, NULL, name);
396 if (!ret)
397 kobject_uevent(&pinst->kobj, KOBJ_ADD);
398
399 return ret;
400}
401
402static int pcrypt_init_padata(struct padata_pcrypt *pcrypt,
403 const char *name)
404{
405 int ret = -ENOMEM;
406 struct pcrypt_cpumask *mask;
407
408 get_online_cpus();
409
410 pcrypt->wq = alloc_workqueue("%s", WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE,
411 1, name);
412 if (!pcrypt->wq)
413 goto err;
414
415 pcrypt->pinst = padata_alloc_possible(pcrypt->wq);
416 if (!pcrypt->pinst)
417 goto err_destroy_workqueue;
418
419 mask = kmalloc(sizeof(*mask), GFP_KERNEL);
420 if (!mask)
421 goto err_free_padata;
422 if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) {
423 kfree(mask);
424 goto err_free_padata;
425 }
426
427 cpumask_and(mask->mask, cpu_possible_mask, cpu_online_mask);
428 rcu_assign_pointer(pcrypt->cb_cpumask, mask);
429
430 pcrypt->nblock.notifier_call = pcrypt_cpumask_change_notify;
431 ret = padata_register_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
432 if (ret)
433 goto err_free_cpumask;
434
435 ret = pcrypt_sysfs_add(pcrypt->pinst, name);
436 if (ret)
437 goto err_unregister_notifier;
438
439 put_online_cpus();
440
441 return ret;
442
443err_unregister_notifier:
444 padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
445err_free_cpumask:
446 free_cpumask_var(mask->mask);
447 kfree(mask);
448err_free_padata:
449 padata_free(pcrypt->pinst);
450err_destroy_workqueue:
451 destroy_workqueue(pcrypt->wq);
452err:
453 put_online_cpus();
454
455 return ret;
456}
457
458static void pcrypt_fini_padata(struct padata_pcrypt *pcrypt)
459{
460 free_cpumask_var(pcrypt->cb_cpumask->mask);
461 kfree(pcrypt->cb_cpumask);
462
463 padata_stop(pcrypt->pinst);
464 padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
465 destroy_workqueue(pcrypt->wq);
466 padata_free(pcrypt->pinst);
467}
468
469static struct crypto_template pcrypt_tmpl = {
470 .name = "pcrypt",
471 .create = pcrypt_create,
472 .free = pcrypt_free,
473 .module = THIS_MODULE,
474};
475
476static int __init pcrypt_init(void)
477{
478 int err = -ENOMEM;
479
480 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
481 if (!pcrypt_kset)
482 goto err;
483
484 err = pcrypt_init_padata(&pencrypt, "pencrypt");
485 if (err)
486 goto err_unreg_kset;
487
488 err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
489 if (err)
490 goto err_deinit_pencrypt;
491
492 padata_start(pencrypt.pinst);
493 padata_start(pdecrypt.pinst);
494
495 return crypto_register_template(&pcrypt_tmpl);
496
497err_deinit_pencrypt:
498 pcrypt_fini_padata(&pencrypt);
499err_unreg_kset:
500 kset_unregister(pcrypt_kset);
501err:
502 return err;
503}
504
505static void __exit pcrypt_exit(void)
506{
507 pcrypt_fini_padata(&pencrypt);
508 pcrypt_fini_padata(&pdecrypt);
509
510 kset_unregister(pcrypt_kset);
511 crypto_unregister_template(&pcrypt_tmpl);
512}
513
514module_init(pcrypt_init);
515module_exit(pcrypt_exit);
516
517MODULE_LICENSE("GPL");
518MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
519MODULE_DESCRIPTION("Parallel crypto wrapper");
520MODULE_ALIAS_CRYPTO("pcrypt");