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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 <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/notifier.h> | |
17 | #include <linux/kobject.h> | |
18 | #include <linux/cpu.h> | |
19 | #include <crypto/pcrypt.h> | |
20 | ||
21 | static struct padata_instance *pencrypt; | |
22 | static struct padata_instance *pdecrypt; | |
23 | static struct kset *pcrypt_kset; | |
24 | ||
25 | struct pcrypt_instance_ctx { | |
26 | struct crypto_aead_spawn spawn; | |
27 | struct padata_shell *psenc; | |
28 | struct padata_shell *psdec; | |
29 | atomic_t tfm_count; | |
30 | }; | |
31 | ||
32 | struct pcrypt_aead_ctx { | |
33 | struct crypto_aead *child; | |
34 | unsigned int cb_cpu; | |
35 | }; | |
36 | ||
37 | static inline struct pcrypt_instance_ctx *pcrypt_tfm_ictx( | |
38 | struct crypto_aead *tfm) | |
39 | { | |
40 | return aead_instance_ctx(aead_alg_instance(tfm)); | |
41 | } | |
42 | ||
43 | static int pcrypt_aead_setkey(struct crypto_aead *parent, | |
44 | const u8 *key, unsigned int keylen) | |
45 | { | |
46 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent); | |
47 | ||
48 | return crypto_aead_setkey(ctx->child, key, keylen); | |
49 | } | |
50 | ||
51 | static int pcrypt_aead_setauthsize(struct crypto_aead *parent, | |
52 | unsigned int authsize) | |
53 | { | |
54 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent); | |
55 | ||
56 | return crypto_aead_setauthsize(ctx->child, authsize); | |
57 | } | |
58 | ||
59 | static void pcrypt_aead_serial(struct padata_priv *padata) | |
60 | { | |
61 | struct pcrypt_request *preq = pcrypt_padata_request(padata); | |
62 | struct aead_request *req = pcrypt_request_ctx(preq); | |
63 | ||
64 | aead_request_complete(req->base.data, padata->info); | |
65 | } | |
66 | ||
67 | static void pcrypt_aead_done(struct crypto_async_request *areq, int err) | |
68 | { | |
69 | struct aead_request *req = areq->data; | |
70 | struct pcrypt_request *preq = aead_request_ctx(req); | |
71 | struct padata_priv *padata = pcrypt_request_padata(preq); | |
72 | ||
73 | padata->info = err; | |
74 | ||
75 | padata_do_serial(padata); | |
76 | } | |
77 | ||
78 | static void pcrypt_aead_enc(struct padata_priv *padata) | |
79 | { | |
80 | struct pcrypt_request *preq = pcrypt_padata_request(padata); | |
81 | struct aead_request *req = pcrypt_request_ctx(preq); | |
82 | int ret; | |
83 | ||
84 | ret = crypto_aead_encrypt(req); | |
85 | ||
86 | if (ret == -EINPROGRESS) | |
87 | return; | |
88 | ||
89 | padata->info = ret; | |
90 | padata_do_serial(padata); | |
91 | } | |
92 | ||
93 | static int pcrypt_aead_encrypt(struct aead_request *req) | |
94 | { | |
95 | int err; | |
96 | struct pcrypt_request *preq = aead_request_ctx(req); | |
97 | struct aead_request *creq = pcrypt_request_ctx(preq); | |
98 | struct padata_priv *padata = pcrypt_request_padata(preq); | |
99 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
100 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead); | |
101 | u32 flags = aead_request_flags(req); | |
102 | struct pcrypt_instance_ctx *ictx; | |
103 | ||
104 | ictx = pcrypt_tfm_ictx(aead); | |
105 | ||
106 | memset(padata, 0, sizeof(struct padata_priv)); | |
107 | ||
108 | padata->parallel = pcrypt_aead_enc; | |
109 | padata->serial = pcrypt_aead_serial; | |
110 | ||
111 | aead_request_set_tfm(creq, ctx->child); | |
112 | aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, | |
113 | pcrypt_aead_done, req); | |
114 | aead_request_set_crypt(creq, req->src, req->dst, | |
115 | req->cryptlen, req->iv); | |
116 | aead_request_set_ad(creq, req->assoclen); | |
117 | ||
118 | err = padata_do_parallel(ictx->psenc, padata, &ctx->cb_cpu); | |
119 | if (!err) | |
120 | return -EINPROGRESS; | |
121 | ||
122 | return err; | |
123 | } | |
124 | ||
125 | static void pcrypt_aead_dec(struct padata_priv *padata) | |
126 | { | |
127 | struct pcrypt_request *preq = pcrypt_padata_request(padata); | |
128 | struct aead_request *req = pcrypt_request_ctx(preq); | |
129 | int ret; | |
130 | ||
131 | ret = crypto_aead_decrypt(req); | |
132 | ||
133 | if (ret == -EINPROGRESS) | |
134 | return; | |
135 | ||
136 | padata->info = ret; | |
137 | padata_do_serial(padata); | |
138 | } | |
139 | ||
140 | static int pcrypt_aead_decrypt(struct aead_request *req) | |
141 | { | |
142 | int err; | |
143 | struct pcrypt_request *preq = aead_request_ctx(req); | |
144 | struct aead_request *creq = pcrypt_request_ctx(preq); | |
145 | struct padata_priv *padata = pcrypt_request_padata(preq); | |
146 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
147 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead); | |
148 | u32 flags = aead_request_flags(req); | |
149 | struct pcrypt_instance_ctx *ictx; | |
150 | ||
151 | ictx = pcrypt_tfm_ictx(aead); | |
152 | ||
153 | memset(padata, 0, sizeof(struct padata_priv)); | |
154 | ||
155 | padata->parallel = pcrypt_aead_dec; | |
156 | padata->serial = pcrypt_aead_serial; | |
157 | ||
158 | aead_request_set_tfm(creq, ctx->child); | |
159 | aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, | |
160 | pcrypt_aead_done, req); | |
161 | aead_request_set_crypt(creq, req->src, req->dst, | |
162 | req->cryptlen, req->iv); | |
163 | aead_request_set_ad(creq, req->assoclen); | |
164 | ||
165 | err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu); | |
166 | if (!err) | |
167 | return -EINPROGRESS; | |
168 | ||
169 | return err; | |
170 | } | |
171 | ||
172 | static int pcrypt_aead_init_tfm(struct crypto_aead *tfm) | |
173 | { | |
174 | int cpu, cpu_index; | |
175 | struct aead_instance *inst = aead_alg_instance(tfm); | |
176 | struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst); | |
177 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm); | |
178 | struct crypto_aead *cipher; | |
179 | ||
180 | cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) % | |
181 | cpumask_weight(cpu_online_mask); | |
182 | ||
183 | ctx->cb_cpu = cpumask_first(cpu_online_mask); | |
184 | for (cpu = 0; cpu < cpu_index; cpu++) | |
185 | ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask); | |
186 | ||
187 | cipher = crypto_spawn_aead(&ictx->spawn); | |
188 | ||
189 | if (IS_ERR(cipher)) | |
190 | return PTR_ERR(cipher); | |
191 | ||
192 | ctx->child = cipher; | |
193 | crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) + | |
194 | sizeof(struct aead_request) + | |
195 | crypto_aead_reqsize(cipher)); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm) | |
201 | { | |
202 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm); | |
203 | ||
204 | crypto_free_aead(ctx->child); | |
205 | } | |
206 | ||
207 | static void pcrypt_free(struct aead_instance *inst) | |
208 | { | |
209 | struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst); | |
210 | ||
211 | crypto_drop_aead(&ctx->spawn); | |
212 | padata_free_shell(ctx->psdec); | |
213 | padata_free_shell(ctx->psenc); | |
214 | kfree(inst); | |
215 | } | |
216 | ||
217 | static int pcrypt_init_instance(struct crypto_instance *inst, | |
218 | struct crypto_alg *alg) | |
219 | { | |
220 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
221 | "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
222 | return -ENAMETOOLONG; | |
223 | ||
224 | memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); | |
225 | ||
226 | inst->alg.cra_priority = alg->cra_priority + 100; | |
227 | inst->alg.cra_blocksize = alg->cra_blocksize; | |
228 | inst->alg.cra_alignmask = alg->cra_alignmask; | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb, | |
234 | u32 type, u32 mask) | |
235 | { | |
236 | struct pcrypt_instance_ctx *ctx; | |
237 | struct crypto_attr_type *algt; | |
238 | struct aead_instance *inst; | |
239 | struct aead_alg *alg; | |
240 | const char *name; | |
241 | int err; | |
242 | ||
243 | algt = crypto_get_attr_type(tb); | |
244 | if (IS_ERR(algt)) | |
245 | return PTR_ERR(algt); | |
246 | ||
247 | name = crypto_attr_alg_name(tb[1]); | |
248 | if (IS_ERR(name)) | |
249 | return PTR_ERR(name); | |
250 | ||
251 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); | |
252 | if (!inst) | |
253 | return -ENOMEM; | |
254 | ||
255 | err = -ENOMEM; | |
256 | ||
257 | ctx = aead_instance_ctx(inst); | |
258 | ctx->psenc = padata_alloc_shell(pencrypt); | |
259 | if (!ctx->psenc) | |
260 | goto out_free_inst; | |
261 | ||
262 | ctx->psdec = padata_alloc_shell(pdecrypt); | |
263 | if (!ctx->psdec) | |
264 | goto out_free_psenc; | |
265 | ||
266 | crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst)); | |
267 | ||
268 | err = crypto_grab_aead(&ctx->spawn, name, 0, 0); | |
269 | if (err) | |
270 | goto out_free_psdec; | |
271 | ||
272 | alg = crypto_spawn_aead_alg(&ctx->spawn); | |
273 | err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base); | |
274 | if (err) | |
275 | goto out_drop_aead; | |
276 | ||
277 | inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC; | |
278 | ||
279 | inst->alg.ivsize = crypto_aead_alg_ivsize(alg); | |
280 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); | |
281 | ||
282 | inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx); | |
283 | ||
284 | inst->alg.init = pcrypt_aead_init_tfm; | |
285 | inst->alg.exit = pcrypt_aead_exit_tfm; | |
286 | ||
287 | inst->alg.setkey = pcrypt_aead_setkey; | |
288 | inst->alg.setauthsize = pcrypt_aead_setauthsize; | |
289 | inst->alg.encrypt = pcrypt_aead_encrypt; | |
290 | inst->alg.decrypt = pcrypt_aead_decrypt; | |
291 | ||
292 | inst->free = pcrypt_free; | |
293 | ||
294 | err = aead_register_instance(tmpl, inst); | |
295 | if (err) | |
296 | goto out_drop_aead; | |
297 | ||
298 | out: | |
299 | return err; | |
300 | ||
301 | out_drop_aead: | |
302 | crypto_drop_aead(&ctx->spawn); | |
303 | out_free_psdec: | |
304 | padata_free_shell(ctx->psdec); | |
305 | out_free_psenc: | |
306 | padata_free_shell(ctx->psenc); | |
307 | out_free_inst: | |
308 | kfree(inst); | |
309 | goto out; | |
310 | } | |
311 | ||
312 | static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb) | |
313 | { | |
314 | struct crypto_attr_type *algt; | |
315 | ||
316 | algt = crypto_get_attr_type(tb); | |
317 | if (IS_ERR(algt)) | |
318 | return PTR_ERR(algt); | |
319 | ||
320 | switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) { | |
321 | case CRYPTO_ALG_TYPE_AEAD: | |
322 | return pcrypt_create_aead(tmpl, tb, algt->type, algt->mask); | |
323 | } | |
324 | ||
325 | return -EINVAL; | |
326 | } | |
327 | ||
328 | static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name) | |
329 | { | |
330 | int ret; | |
331 | ||
332 | pinst->kobj.kset = pcrypt_kset; | |
333 | ret = kobject_add(&pinst->kobj, NULL, "%s", name); | |
334 | if (!ret) | |
335 | kobject_uevent(&pinst->kobj, KOBJ_ADD); | |
336 | ||
337 | return ret; | |
338 | } | |
339 | ||
340 | static int pcrypt_init_padata(struct padata_instance **pinst, const char *name) | |
341 | { | |
342 | int ret = -ENOMEM; | |
343 | ||
344 | *pinst = padata_alloc_possible(name); | |
345 | if (!*pinst) | |
346 | return ret; | |
347 | ||
348 | ret = pcrypt_sysfs_add(*pinst, name); | |
349 | if (ret) | |
350 | padata_free(*pinst); | |
351 | ||
352 | return ret; | |
353 | } | |
354 | ||
355 | static void pcrypt_fini_padata(struct padata_instance *pinst) | |
356 | { | |
357 | padata_stop(pinst); | |
358 | padata_free(pinst); | |
359 | } | |
360 | ||
361 | static struct crypto_template pcrypt_tmpl = { | |
362 | .name = "pcrypt", | |
363 | .create = pcrypt_create, | |
364 | .module = THIS_MODULE, | |
365 | }; | |
366 | ||
367 | static int __init pcrypt_init(void) | |
368 | { | |
369 | int err = -ENOMEM; | |
370 | ||
371 | pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj); | |
372 | if (!pcrypt_kset) | |
373 | goto err; | |
374 | ||
375 | err = pcrypt_init_padata(&pencrypt, "pencrypt"); | |
376 | if (err) | |
377 | goto err_unreg_kset; | |
378 | ||
379 | err = pcrypt_init_padata(&pdecrypt, "pdecrypt"); | |
380 | if (err) | |
381 | goto err_deinit_pencrypt; | |
382 | ||
383 | padata_start(pencrypt); | |
384 | padata_start(pdecrypt); | |
385 | ||
386 | return crypto_register_template(&pcrypt_tmpl); | |
387 | ||
388 | err_deinit_pencrypt: | |
389 | pcrypt_fini_padata(pencrypt); | |
390 | err_unreg_kset: | |
391 | kset_unregister(pcrypt_kset); | |
392 | err: | |
393 | return err; | |
394 | } | |
395 | ||
396 | static void __exit pcrypt_exit(void) | |
397 | { | |
398 | crypto_unregister_template(&pcrypt_tmpl); | |
399 | ||
400 | pcrypt_fini_padata(pencrypt); | |
401 | pcrypt_fini_padata(pdecrypt); | |
402 | ||
403 | kset_unregister(pcrypt_kset); | |
404 | } | |
405 | ||
406 | subsys_initcall(pcrypt_init); | |
407 | module_exit(pcrypt_exit); | |
408 | ||
409 | MODULE_LICENSE("GPL"); | |
410 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); | |
411 | MODULE_DESCRIPTION("Parallel crypto wrapper"); | |
412 | MODULE_ALIAS_CRYPTO("pcrypt"); |