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