1 // SPDX-License-Identifier: GPL-2.0-only
3 * pcrypt - Parallel crypto wrapper.
5 * Copyright (C) 2009 secunet Security Networks AG
6 * Copyright (C) 2009 Steffen Klassert <steffen.klassert@secunet.com>
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>
21 struct padata_pcrypt {
22 struct padata_instance *pinst;
25 * Cpumask for callback CPUs. It should be
26 * equal to serial cpumask of corresponding padata instance,
27 * so it is updated when padata notifies us about serial
30 * cb_cpumask is protected by RCU. This fact prevents us from
31 * using cpumask_var_t directly because the actual type of
32 * cpumsak_var_t depends on kernel configuration(particularly on
33 * CONFIG_CPUMASK_OFFSTACK macro). Depending on the configuration
34 * cpumask_var_t may be either a pointer to the struct cpumask
35 * or a variable allocated on the stack. Thus we can not safely use
36 * cpumask_var_t with RCU operations such as rcu_assign_pointer or
37 * rcu_dereference. So cpumask_var_t is wrapped with struct
38 * pcrypt_cpumask which makes possible to use it with RCU.
40 struct pcrypt_cpumask {
43 struct notifier_block nblock;
46 static struct padata_pcrypt pencrypt;
47 static struct padata_pcrypt pdecrypt;
48 static struct kset *pcrypt_kset;
50 struct pcrypt_instance_ctx {
51 struct crypto_aead_spawn spawn;
55 struct pcrypt_aead_ctx {
56 struct crypto_aead *child;
60 static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,
61 struct padata_pcrypt *pcrypt)
63 unsigned int cpu_index, cpu, i;
64 struct pcrypt_cpumask *cpumask;
69 cpumask = rcu_dereference_bh(pcrypt->cb_cpumask);
70 if (cpumask_test_cpu(cpu, cpumask->mask))
73 if (!cpumask_weight(cpumask->mask))
76 cpu_index = cpu % cpumask_weight(cpumask->mask);
78 cpu = cpumask_first(cpumask->mask);
79 for (i = 0; i < cpu_index; i++)
80 cpu = cpumask_next(cpu, cpumask->mask);
86 return padata_do_parallel(pcrypt->pinst, padata, cpu);
89 static int pcrypt_aead_setkey(struct crypto_aead *parent,
90 const u8 *key, unsigned int keylen)
92 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
94 return crypto_aead_setkey(ctx->child, key, keylen);
97 static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
98 unsigned int authsize)
100 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
102 return crypto_aead_setauthsize(ctx->child, authsize);
105 static void pcrypt_aead_serial(struct padata_priv *padata)
107 struct pcrypt_request *preq = pcrypt_padata_request(padata);
108 struct aead_request *req = pcrypt_request_ctx(preq);
110 aead_request_complete(req->base.data, padata->info);
113 static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
115 struct aead_request *req = areq->data;
116 struct pcrypt_request *preq = aead_request_ctx(req);
117 struct padata_priv *padata = pcrypt_request_padata(preq);
120 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
122 padata_do_serial(padata);
125 static void pcrypt_aead_enc(struct padata_priv *padata)
127 struct pcrypt_request *preq = pcrypt_padata_request(padata);
128 struct aead_request *req = pcrypt_request_ctx(preq);
130 padata->info = crypto_aead_encrypt(req);
132 if (padata->info == -EINPROGRESS)
135 padata_do_serial(padata);
138 static int pcrypt_aead_encrypt(struct aead_request *req)
141 struct pcrypt_request *preq = aead_request_ctx(req);
142 struct aead_request *creq = pcrypt_request_ctx(preq);
143 struct padata_priv *padata = pcrypt_request_padata(preq);
144 struct crypto_aead *aead = crypto_aead_reqtfm(req);
145 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
146 u32 flags = aead_request_flags(req);
148 memset(padata, 0, sizeof(struct padata_priv));
150 padata->parallel = pcrypt_aead_enc;
151 padata->serial = pcrypt_aead_serial;
153 aead_request_set_tfm(creq, ctx->child);
154 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
155 pcrypt_aead_done, req);
156 aead_request_set_crypt(creq, req->src, req->dst,
157 req->cryptlen, req->iv);
158 aead_request_set_ad(creq, req->assoclen);
160 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt);
167 static void pcrypt_aead_dec(struct padata_priv *padata)
169 struct pcrypt_request *preq = pcrypt_padata_request(padata);
170 struct aead_request *req = pcrypt_request_ctx(preq);
172 padata->info = crypto_aead_decrypt(req);
174 if (padata->info == -EINPROGRESS)
177 padata_do_serial(padata);
180 static int pcrypt_aead_decrypt(struct aead_request *req)
183 struct pcrypt_request *preq = aead_request_ctx(req);
184 struct aead_request *creq = pcrypt_request_ctx(preq);
185 struct padata_priv *padata = pcrypt_request_padata(preq);
186 struct crypto_aead *aead = crypto_aead_reqtfm(req);
187 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
188 u32 flags = aead_request_flags(req);
190 memset(padata, 0, sizeof(struct padata_priv));
192 padata->parallel = pcrypt_aead_dec;
193 padata->serial = pcrypt_aead_serial;
195 aead_request_set_tfm(creq, ctx->child);
196 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
197 pcrypt_aead_done, req);
198 aead_request_set_crypt(creq, req->src, req->dst,
199 req->cryptlen, req->iv);
200 aead_request_set_ad(creq, req->assoclen);
202 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pdecrypt);
209 static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
212 struct aead_instance *inst = aead_alg_instance(tfm);
213 struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
214 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
215 struct crypto_aead *cipher;
217 cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
218 cpumask_weight(cpu_online_mask);
220 ctx->cb_cpu = cpumask_first(cpu_online_mask);
221 for (cpu = 0; cpu < cpu_index; cpu++)
222 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
224 cipher = crypto_spawn_aead(&ictx->spawn);
227 return PTR_ERR(cipher);
230 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
231 sizeof(struct aead_request) +
232 crypto_aead_reqsize(cipher));
237 static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
239 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
241 crypto_free_aead(ctx->child);
244 static void pcrypt_free(struct aead_instance *inst)
246 struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);
248 crypto_drop_aead(&ctx->spawn);
252 static int pcrypt_init_instance(struct crypto_instance *inst,
253 struct crypto_alg *alg)
255 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
256 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
257 return -ENAMETOOLONG;
259 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
261 inst->alg.cra_priority = alg->cra_priority + 100;
262 inst->alg.cra_blocksize = alg->cra_blocksize;
263 inst->alg.cra_alignmask = alg->cra_alignmask;
268 static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
271 struct pcrypt_instance_ctx *ctx;
272 struct crypto_attr_type *algt;
273 struct aead_instance *inst;
274 struct aead_alg *alg;
278 algt = crypto_get_attr_type(tb);
280 return PTR_ERR(algt);
282 name = crypto_attr_alg_name(tb[1]);
284 return PTR_ERR(name);
286 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
290 ctx = aead_instance_ctx(inst);
291 crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst));
293 err = crypto_grab_aead(&ctx->spawn, name, 0, 0);
297 alg = crypto_spawn_aead_alg(&ctx->spawn);
298 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
302 inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC;
304 inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
305 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
307 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
309 inst->alg.init = pcrypt_aead_init_tfm;
310 inst->alg.exit = pcrypt_aead_exit_tfm;
312 inst->alg.setkey = pcrypt_aead_setkey;
313 inst->alg.setauthsize = pcrypt_aead_setauthsize;
314 inst->alg.encrypt = pcrypt_aead_encrypt;
315 inst->alg.decrypt = pcrypt_aead_decrypt;
317 inst->free = pcrypt_free;
319 err = aead_register_instance(tmpl, inst);
327 crypto_drop_aead(&ctx->spawn);
333 static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
335 struct crypto_attr_type *algt;
337 algt = crypto_get_attr_type(tb);
339 return PTR_ERR(algt);
341 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
342 case CRYPTO_ALG_TYPE_AEAD:
343 return pcrypt_create_aead(tmpl, tb, algt->type, algt->mask);
349 static int pcrypt_cpumask_change_notify(struct notifier_block *self,
350 unsigned long val, void *data)
352 struct padata_pcrypt *pcrypt;
353 struct pcrypt_cpumask *new_mask, *old_mask;
354 struct padata_cpumask *cpumask = (struct padata_cpumask *)data;
356 if (!(val & PADATA_CPU_SERIAL))
359 pcrypt = container_of(self, struct padata_pcrypt, nblock);
360 new_mask = kmalloc(sizeof(*new_mask), GFP_KERNEL);
363 if (!alloc_cpumask_var(&new_mask->mask, GFP_KERNEL)) {
368 old_mask = pcrypt->cb_cpumask;
370 cpumask_copy(new_mask->mask, cpumask->cbcpu);
371 rcu_assign_pointer(pcrypt->cb_cpumask, new_mask);
374 free_cpumask_var(old_mask->mask);
379 static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
383 pinst->kobj.kset = pcrypt_kset;
384 ret = kobject_add(&pinst->kobj, NULL, "%s", name);
386 kobject_uevent(&pinst->kobj, KOBJ_ADD);
391 static int pcrypt_init_padata(struct padata_pcrypt *pcrypt,
395 struct pcrypt_cpumask *mask;
399 pcrypt->pinst = padata_alloc_possible(name);
403 mask = kmalloc(sizeof(*mask), GFP_KERNEL);
405 goto err_free_padata;
406 if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) {
408 goto err_free_padata;
411 cpumask_and(mask->mask, cpu_possible_mask, cpu_online_mask);
412 rcu_assign_pointer(pcrypt->cb_cpumask, mask);
414 pcrypt->nblock.notifier_call = pcrypt_cpumask_change_notify;
415 ret = padata_register_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
417 goto err_free_cpumask;
419 ret = pcrypt_sysfs_add(pcrypt->pinst, name);
421 goto err_unregister_notifier;
427 err_unregister_notifier:
428 padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
430 free_cpumask_var(mask->mask);
433 padata_free(pcrypt->pinst);
440 static void pcrypt_fini_padata(struct padata_pcrypt *pcrypt)
442 free_cpumask_var(pcrypt->cb_cpumask->mask);
443 kfree(pcrypt->cb_cpumask);
445 padata_stop(pcrypt->pinst);
446 padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
447 padata_free(pcrypt->pinst);
450 static struct crypto_template pcrypt_tmpl = {
452 .create = pcrypt_create,
453 .module = THIS_MODULE,
456 static int __init pcrypt_init(void)
460 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
464 err = pcrypt_init_padata(&pencrypt, "pencrypt");
468 err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
470 goto err_deinit_pencrypt;
472 padata_start(pencrypt.pinst);
473 padata_start(pdecrypt.pinst);
475 return crypto_register_template(&pcrypt_tmpl);
478 pcrypt_fini_padata(&pencrypt);
480 kset_unregister(pcrypt_kset);
485 static void __exit pcrypt_exit(void)
487 pcrypt_fini_padata(&pencrypt);
488 pcrypt_fini_padata(&pdecrypt);
490 kset_unregister(pcrypt_kset);
491 crypto_unregister_template(&pcrypt_tmpl);
494 subsys_initcall(pcrypt_init);
495 module_exit(pcrypt_exit);
497 MODULE_LICENSE("GPL");
498 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
499 MODULE_DESCRIPTION("Parallel crypto wrapper");
500 MODULE_ALIAS_CRYPTO("pcrypt");