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;
27 struct padata_shell *psenc;
28 struct padata_shell *psdec;
32 struct pcrypt_aead_ctx {
33 struct crypto_aead *child;
37 static inline struct pcrypt_instance_ctx *pcrypt_tfm_ictx(
38 struct crypto_aead *tfm)
40 return aead_instance_ctx(aead_alg_instance(tfm));
43 static int pcrypt_aead_setkey(struct crypto_aead *parent,
44 const u8 *key, unsigned int keylen)
46 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
48 return crypto_aead_setkey(ctx->child, key, keylen);
51 static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
52 unsigned int authsize)
54 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
56 return crypto_aead_setauthsize(ctx->child, authsize);
59 static void pcrypt_aead_serial(struct padata_priv *padata)
61 struct pcrypt_request *preq = pcrypt_padata_request(padata);
62 struct aead_request *req = pcrypt_request_ctx(preq);
64 aead_request_complete(req->base.data, padata->info);
67 static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
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);
75 padata_do_serial(padata);
78 static void pcrypt_aead_enc(struct padata_priv *padata)
80 struct pcrypt_request *preq = pcrypt_padata_request(padata);
81 struct aead_request *req = pcrypt_request_ctx(preq);
84 ret = crypto_aead_encrypt(req);
86 if (ret == -EINPROGRESS)
90 padata_do_serial(padata);
93 static int pcrypt_aead_encrypt(struct aead_request *req)
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;
104 ictx = pcrypt_tfm_ictx(aead);
106 memset(padata, 0, sizeof(struct padata_priv));
108 padata->parallel = pcrypt_aead_enc;
109 padata->serial = pcrypt_aead_serial;
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);
118 err = padata_do_parallel(ictx->psenc, padata, &ctx->cb_cpu);
125 static void pcrypt_aead_dec(struct padata_priv *padata)
127 struct pcrypt_request *preq = pcrypt_padata_request(padata);
128 struct aead_request *req = pcrypt_request_ctx(preq);
131 ret = crypto_aead_decrypt(req);
133 if (ret == -EINPROGRESS)
137 padata_do_serial(padata);
140 static int pcrypt_aead_decrypt(struct aead_request *req)
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;
151 ictx = pcrypt_tfm_ictx(aead);
153 memset(padata, 0, sizeof(struct padata_priv));
155 padata->parallel = pcrypt_aead_dec;
156 padata->serial = pcrypt_aead_serial;
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);
165 err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu);
172 static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
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;
180 cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
181 cpumask_weight(cpu_online_mask);
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);
187 cipher = crypto_spawn_aead(&ictx->spawn);
190 return PTR_ERR(cipher);
193 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
194 sizeof(struct aead_request) +
195 crypto_aead_reqsize(cipher));
200 static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
202 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
204 crypto_free_aead(ctx->child);
207 static void pcrypt_free(struct aead_instance *inst)
209 struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);
211 crypto_drop_aead(&ctx->spawn);
212 padata_free_shell(ctx->psdec);
213 padata_free_shell(ctx->psenc);
217 static int pcrypt_init_instance(struct crypto_instance *inst,
218 struct crypto_alg *alg)
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;
224 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
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;
233 static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
236 struct pcrypt_instance_ctx *ctx;
237 struct crypto_attr_type *algt;
238 struct aead_instance *inst;
239 struct aead_alg *alg;
243 algt = crypto_get_attr_type(tb);
245 return PTR_ERR(algt);
247 name = crypto_attr_alg_name(tb[1]);
249 return PTR_ERR(name);
251 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
257 ctx = aead_instance_ctx(inst);
258 ctx->psenc = padata_alloc_shell(pencrypt);
262 ctx->psdec = padata_alloc_shell(pdecrypt);
266 crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst));
268 err = crypto_grab_aead(&ctx->spawn, name, 0, 0);
272 alg = crypto_spawn_aead_alg(&ctx->spawn);
273 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
277 inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC;
279 inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
280 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
282 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
284 inst->alg.init = pcrypt_aead_init_tfm;
285 inst->alg.exit = pcrypt_aead_exit_tfm;
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;
292 inst->free = pcrypt_free;
294 err = aead_register_instance(tmpl, inst);
302 crypto_drop_aead(&ctx->spawn);
304 padata_free_shell(ctx->psdec);
306 padata_free_shell(ctx->psenc);
312 static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
314 struct crypto_attr_type *algt;
316 algt = crypto_get_attr_type(tb);
318 return PTR_ERR(algt);
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);
328 static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
332 pinst->kobj.kset = pcrypt_kset;
333 ret = kobject_add(&pinst->kobj, NULL, "%s", name);
335 kobject_uevent(&pinst->kobj, KOBJ_ADD);
340 static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)
344 *pinst = padata_alloc_possible(name);
348 ret = pcrypt_sysfs_add(*pinst, name);
355 static void pcrypt_fini_padata(struct padata_instance *pinst)
361 static struct crypto_template pcrypt_tmpl = {
363 .create = pcrypt_create,
364 .module = THIS_MODULE,
367 static int __init pcrypt_init(void)
371 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
375 err = pcrypt_init_padata(&pencrypt, "pencrypt");
379 err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
381 goto err_deinit_pencrypt;
383 padata_start(pencrypt);
384 padata_start(pdecrypt);
386 return crypto_register_template(&pcrypt_tmpl);
389 pcrypt_fini_padata(pencrypt);
391 kset_unregister(pcrypt_kset);
396 static void __exit pcrypt_exit(void)
398 crypto_unregister_template(&pcrypt_tmpl);
400 pcrypt_fini_padata(pencrypt);
401 pcrypt_fini_padata(pdecrypt);
403 kset_unregister(pcrypt_kset);
406 subsys_initcall(pcrypt_init);
407 module_exit(pcrypt_exit);
409 MODULE_LICENSE("GPL");
410 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
411 MODULE_DESCRIPTION("Parallel crypto wrapper");
412 MODULE_ALIAS_CRYPTO("pcrypt");