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 static struct padata_instance *pencrypt;
22 static struct padata_instance *pdecrypt;
23 static struct kset *pcrypt_kset;
25 struct pcrypt_instance_ctx {
26 struct crypto_aead_spawn spawn;
30 struct pcrypt_aead_ctx {
31 struct crypto_aead *child;
35 static int pcrypt_aead_setkey(struct crypto_aead *parent,
36 const u8 *key, unsigned int keylen)
38 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
40 return crypto_aead_setkey(ctx->child, key, keylen);
43 static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
44 unsigned int authsize)
46 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
48 return crypto_aead_setauthsize(ctx->child, authsize);
51 static void pcrypt_aead_serial(struct padata_priv *padata)
53 struct pcrypt_request *preq = pcrypt_padata_request(padata);
54 struct aead_request *req = pcrypt_request_ctx(preq);
56 aead_request_complete(req->base.data, padata->info);
59 static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
61 struct aead_request *req = areq->data;
62 struct pcrypt_request *preq = aead_request_ctx(req);
63 struct padata_priv *padata = pcrypt_request_padata(preq);
66 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
68 padata_do_serial(padata);
71 static void pcrypt_aead_enc(struct padata_priv *padata)
73 struct pcrypt_request *preq = pcrypt_padata_request(padata);
74 struct aead_request *req = pcrypt_request_ctx(preq);
76 padata->info = crypto_aead_encrypt(req);
78 if (padata->info == -EINPROGRESS)
81 padata_do_serial(padata);
84 static int pcrypt_aead_encrypt(struct aead_request *req)
87 struct pcrypt_request *preq = aead_request_ctx(req);
88 struct aead_request *creq = pcrypt_request_ctx(preq);
89 struct padata_priv *padata = pcrypt_request_padata(preq);
90 struct crypto_aead *aead = crypto_aead_reqtfm(req);
91 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
92 u32 flags = aead_request_flags(req);
94 memset(padata, 0, sizeof(struct padata_priv));
96 padata->parallel = pcrypt_aead_enc;
97 padata->serial = pcrypt_aead_serial;
99 aead_request_set_tfm(creq, ctx->child);
100 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
101 pcrypt_aead_done, req);
102 aead_request_set_crypt(creq, req->src, req->dst,
103 req->cryptlen, req->iv);
104 aead_request_set_ad(creq, req->assoclen);
106 err = padata_do_parallel(pencrypt, padata, &ctx->cb_cpu);
113 static void pcrypt_aead_dec(struct padata_priv *padata)
115 struct pcrypt_request *preq = pcrypt_padata_request(padata);
116 struct aead_request *req = pcrypt_request_ctx(preq);
118 padata->info = crypto_aead_decrypt(req);
120 if (padata->info == -EINPROGRESS)
123 padata_do_serial(padata);
126 static int pcrypt_aead_decrypt(struct aead_request *req)
129 struct pcrypt_request *preq = aead_request_ctx(req);
130 struct aead_request *creq = pcrypt_request_ctx(preq);
131 struct padata_priv *padata = pcrypt_request_padata(preq);
132 struct crypto_aead *aead = crypto_aead_reqtfm(req);
133 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
134 u32 flags = aead_request_flags(req);
136 memset(padata, 0, sizeof(struct padata_priv));
138 padata->parallel = pcrypt_aead_dec;
139 padata->serial = pcrypt_aead_serial;
141 aead_request_set_tfm(creq, ctx->child);
142 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
143 pcrypt_aead_done, req);
144 aead_request_set_crypt(creq, req->src, req->dst,
145 req->cryptlen, req->iv);
146 aead_request_set_ad(creq, req->assoclen);
148 err = padata_do_parallel(pdecrypt, padata, &ctx->cb_cpu);
155 static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
158 struct aead_instance *inst = aead_alg_instance(tfm);
159 struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
160 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
161 struct crypto_aead *cipher;
163 cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
164 cpumask_weight(cpu_online_mask);
166 ctx->cb_cpu = cpumask_first(cpu_online_mask);
167 for (cpu = 0; cpu < cpu_index; cpu++)
168 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
170 cipher = crypto_spawn_aead(&ictx->spawn);
173 return PTR_ERR(cipher);
176 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
177 sizeof(struct aead_request) +
178 crypto_aead_reqsize(cipher));
183 static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
185 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
187 crypto_free_aead(ctx->child);
190 static void pcrypt_free(struct aead_instance *inst)
192 struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);
194 crypto_drop_aead(&ctx->spawn);
198 static int pcrypt_init_instance(struct crypto_instance *inst,
199 struct crypto_alg *alg)
201 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
202 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
203 return -ENAMETOOLONG;
205 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
207 inst->alg.cra_priority = alg->cra_priority + 100;
208 inst->alg.cra_blocksize = alg->cra_blocksize;
209 inst->alg.cra_alignmask = alg->cra_alignmask;
214 static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
217 struct pcrypt_instance_ctx *ctx;
218 struct crypto_attr_type *algt;
219 struct aead_instance *inst;
220 struct aead_alg *alg;
224 algt = crypto_get_attr_type(tb);
226 return PTR_ERR(algt);
228 name = crypto_attr_alg_name(tb[1]);
230 return PTR_ERR(name);
232 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
236 ctx = aead_instance_ctx(inst);
237 crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst));
239 err = crypto_grab_aead(&ctx->spawn, name, 0, 0);
243 alg = crypto_spawn_aead_alg(&ctx->spawn);
244 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
248 inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC;
250 inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
251 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
253 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
255 inst->alg.init = pcrypt_aead_init_tfm;
256 inst->alg.exit = pcrypt_aead_exit_tfm;
258 inst->alg.setkey = pcrypt_aead_setkey;
259 inst->alg.setauthsize = pcrypt_aead_setauthsize;
260 inst->alg.encrypt = pcrypt_aead_encrypt;
261 inst->alg.decrypt = pcrypt_aead_decrypt;
263 inst->free = pcrypt_free;
265 err = aead_register_instance(tmpl, inst);
273 crypto_drop_aead(&ctx->spawn);
279 static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
281 struct crypto_attr_type *algt;
283 algt = crypto_get_attr_type(tb);
285 return PTR_ERR(algt);
287 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
288 case CRYPTO_ALG_TYPE_AEAD:
289 return pcrypt_create_aead(tmpl, tb, algt->type, algt->mask);
295 static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
299 pinst->kobj.kset = pcrypt_kset;
300 ret = kobject_add(&pinst->kobj, NULL, "%s", name);
302 kobject_uevent(&pinst->kobj, KOBJ_ADD);
307 static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)
311 *pinst = padata_alloc_possible(name);
315 ret = pcrypt_sysfs_add(*pinst, name);
322 static void pcrypt_fini_padata(struct padata_instance *pinst)
328 static struct crypto_template pcrypt_tmpl = {
330 .create = pcrypt_create,
331 .module = THIS_MODULE,
334 static int __init pcrypt_init(void)
338 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
342 err = pcrypt_init_padata(&pencrypt, "pencrypt");
346 err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
348 goto err_deinit_pencrypt;
350 padata_start(pencrypt);
351 padata_start(pdecrypt);
353 return crypto_register_template(&pcrypt_tmpl);
356 pcrypt_fini_padata(pencrypt);
358 kset_unregister(pcrypt_kset);
363 static void __exit pcrypt_exit(void)
365 pcrypt_fini_padata(pencrypt);
366 pcrypt_fini_padata(pdecrypt);
368 kset_unregister(pcrypt_kset);
369 crypto_unregister_template(&pcrypt_tmpl);
372 subsys_initcall(pcrypt_init);
373 module_exit(pcrypt_exit);
375 MODULE_LICENSE("GPL");
376 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
377 MODULE_DESCRIPTION("Parallel crypto wrapper");
378 MODULE_ALIAS_CRYPTO("pcrypt");