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
20 static struct padata_instance *pencrypt;
21 static struct padata_instance *pdecrypt;
22 static struct kset *pcrypt_kset;
23
24 struct 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
31 struct pcrypt_aead_ctx {
32 struct crypto_aead *child;
33 unsigned int cb_cpu;
34 };
35
pcrypt_tfm_ictx(struct crypto_aead * tfm)36 static 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
pcrypt_aead_setkey(struct crypto_aead * parent,const u8 * key,unsigned int keylen)42 static 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
pcrypt_aead_setauthsize(struct crypto_aead * parent,unsigned int authsize)50 static 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
pcrypt_aead_serial(struct padata_priv * padata)58 static 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
pcrypt_aead_done(void * data,int err)66 static 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
pcrypt_aead_enc(struct padata_priv * padata)77 static 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
pcrypt_aead_encrypt(struct aead_request * req)92 static 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
121 return err;
122 }
123
pcrypt_aead_dec(struct padata_priv * padata)124 static void pcrypt_aead_dec(struct padata_priv *padata)
125 {
126 struct pcrypt_request *preq = pcrypt_padata_request(padata);
127 struct aead_request *req = pcrypt_request_ctx(preq);
128 int ret;
129
130 ret = crypto_aead_decrypt(req);
131
132 if (ret == -EINPROGRESS)
133 return;
134
135 padata->info = ret;
136 padata_do_serial(padata);
137 }
138
pcrypt_aead_decrypt(struct aead_request * req)139 static int pcrypt_aead_decrypt(struct aead_request *req)
140 {
141 int err;
142 struct pcrypt_request *preq = aead_request_ctx(req);
143 struct aead_request *creq = pcrypt_request_ctx(preq);
144 struct padata_priv *padata = pcrypt_request_padata(preq);
145 struct crypto_aead *aead = crypto_aead_reqtfm(req);
146 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
147 u32 flags = aead_request_flags(req);
148 struct pcrypt_instance_ctx *ictx;
149
150 ictx = pcrypt_tfm_ictx(aead);
151
152 memset(padata, 0, sizeof(struct padata_priv));
153
154 padata->parallel = pcrypt_aead_dec;
155 padata->serial = pcrypt_aead_serial;
156
157 aead_request_set_tfm(creq, ctx->child);
158 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
159 pcrypt_aead_done, req);
160 aead_request_set_crypt(creq, req->src, req->dst,
161 req->cryptlen, req->iv);
162 aead_request_set_ad(creq, req->assoclen);
163
164 err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu);
165 if (!err)
166 return -EINPROGRESS;
167
168 return err;
169 }
170
pcrypt_aead_init_tfm(struct crypto_aead * tfm)171 static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
172 {
173 int cpu, cpu_index;
174 struct aead_instance *inst = aead_alg_instance(tfm);
175 struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
176 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
177 struct crypto_aead *cipher;
178
179 cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
180 cpumask_weight(cpu_online_mask);
181
182 ctx->cb_cpu = cpumask_first(cpu_online_mask);
183 for (cpu = 0; cpu < cpu_index; cpu++)
184 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
185
186 cipher = crypto_spawn_aead(&ictx->spawn);
187
188 if (IS_ERR(cipher))
189 return PTR_ERR(cipher);
190
191 ctx->child = cipher;
192 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
193 sizeof(struct aead_request) +
194 crypto_aead_reqsize(cipher));
195
196 return 0;
197 }
198
pcrypt_aead_exit_tfm(struct crypto_aead * tfm)199 static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
200 {
201 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
202
203 crypto_free_aead(ctx->child);
204 }
205
pcrypt_free(struct aead_instance * inst)206 static void pcrypt_free(struct aead_instance *inst)
207 {
208 struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);
209
210 crypto_drop_aead(&ctx->spawn);
211 padata_free_shell(ctx->psdec);
212 padata_free_shell(ctx->psenc);
213 kfree(inst);
214 }
215
pcrypt_init_instance(struct crypto_instance * inst,struct crypto_alg * alg)216 static int pcrypt_init_instance(struct crypto_instance *inst,
217 struct crypto_alg *alg)
218 {
219 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
220 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
221 return -ENAMETOOLONG;
222
223 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
224
225 inst->alg.cra_priority = alg->cra_priority + 100;
226 inst->alg.cra_blocksize = alg->cra_blocksize;
227 inst->alg.cra_alignmask = alg->cra_alignmask;
228
229 return 0;
230 }
231
pcrypt_create_aead(struct crypto_template * tmpl,struct rtattr ** tb,struct crypto_attr_type * algt)232 static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
233 struct crypto_attr_type *algt)
234 {
235 struct pcrypt_instance_ctx *ctx;
236 struct aead_instance *inst;
237 struct aead_alg *alg;
238 u32 mask = crypto_algt_inherited_mask(algt);
239 int err;
240
241 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
242 if (!inst)
243 return -ENOMEM;
244
245 err = -ENOMEM;
246
247 ctx = aead_instance_ctx(inst);
248 ctx->psenc = padata_alloc_shell(pencrypt);
249 if (!ctx->psenc)
250 goto err_free_inst;
251
252 ctx->psdec = padata_alloc_shell(pdecrypt);
253 if (!ctx->psdec)
254 goto err_free_inst;
255
256 err = crypto_grab_aead(&ctx->spawn, aead_crypto_instance(inst),
257 crypto_attr_alg_name(tb[1]), 0, mask);
258 if (err)
259 goto err_free_inst;
260
261 alg = crypto_spawn_aead_alg(&ctx->spawn);
262 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
263 if (err)
264 goto err_free_inst;
265
266 inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC;
267
268 inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
269 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
270
271 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
272
273 inst->alg.init = pcrypt_aead_init_tfm;
274 inst->alg.exit = pcrypt_aead_exit_tfm;
275
276 inst->alg.setkey = pcrypt_aead_setkey;
277 inst->alg.setauthsize = pcrypt_aead_setauthsize;
278 inst->alg.encrypt = pcrypt_aead_encrypt;
279 inst->alg.decrypt = pcrypt_aead_decrypt;
280
281 inst->free = pcrypt_free;
282
283 err = aead_register_instance(tmpl, inst);
284 if (err) {
285 err_free_inst:
286 pcrypt_free(inst);
287 }
288 return err;
289 }
290
pcrypt_create(struct crypto_template * tmpl,struct rtattr ** tb)291 static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
292 {
293 struct crypto_attr_type *algt;
294
295 algt = crypto_get_attr_type(tb);
296 if (IS_ERR(algt))
297 return PTR_ERR(algt);
298
299 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
300 case CRYPTO_ALG_TYPE_AEAD:
301 return pcrypt_create_aead(tmpl, tb, algt);
302 }
303
304 return -EINVAL;
305 }
306
pcrypt_sysfs_add(struct padata_instance * pinst,const char * name)307 static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
308 {
309 int ret;
310
311 pinst->kobj.kset = pcrypt_kset;
312 ret = kobject_add(&pinst->kobj, NULL, "%s", name);
313 if (!ret)
314 kobject_uevent(&pinst->kobj, KOBJ_ADD);
315
316 return ret;
317 }
318
pcrypt_init_padata(struct padata_instance ** pinst,const char * name)319 static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)
320 {
321 int ret = -ENOMEM;
322
323 *pinst = padata_alloc(name);
324 if (!*pinst)
325 return ret;
326
327 ret = pcrypt_sysfs_add(*pinst, name);
328 if (ret)
329 padata_free(*pinst);
330
331 return ret;
332 }
333
334 static struct crypto_template pcrypt_tmpl = {
335 .name = "pcrypt",
336 .create = pcrypt_create,
337 .module = THIS_MODULE,
338 };
339
pcrypt_init(void)340 static int __init pcrypt_init(void)
341 {
342 int err = -ENOMEM;
343
344 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
345 if (!pcrypt_kset)
346 goto err;
347
348 err = pcrypt_init_padata(&pencrypt, "pencrypt");
349 if (err)
350 goto err_unreg_kset;
351
352 err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
353 if (err)
354 goto err_deinit_pencrypt;
355
356 return crypto_register_template(&pcrypt_tmpl);
357
358 err_deinit_pencrypt:
359 padata_free(pencrypt);
360 err_unreg_kset:
361 kset_unregister(pcrypt_kset);
362 err:
363 return err;
364 }
365
pcrypt_exit(void)366 static void __exit pcrypt_exit(void)
367 {
368 crypto_unregister_template(&pcrypt_tmpl);
369
370 padata_free(pencrypt);
371 padata_free(pdecrypt);
372
373 kset_unregister(pcrypt_kset);
374 }
375
376 subsys_initcall(pcrypt_init);
377 module_exit(pcrypt_exit);
378
379 MODULE_LICENSE("GPL");
380 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
381 MODULE_DESCRIPTION("Parallel crypto wrapper");
382 MODULE_ALIAS_CRYPTO("pcrypt");
383
