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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * pcrypt - Parallel crypto wrapper.4 *5 * Copyright (C) 2009 secunet Security Networks AG6 * 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 20static struct padata_instance *pencrypt;21static struct padata_instance *pdecrypt;22static struct kset           *pcrypt_kset;23 24struct 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 31struct pcrypt_aead_ctx {32	struct crypto_aead *child;33	unsigned int cb_cpu;34};35 36static 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 42static 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 50static 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 58static 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 66static 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 77static 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 92static 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	if (err == -EBUSY)121		return -EAGAIN;122 123	return err;124}125 126static void pcrypt_aead_dec(struct padata_priv *padata)127{128	struct pcrypt_request *preq = pcrypt_padata_request(padata);129	struct aead_request *req = pcrypt_request_ctx(preq);130	int ret;131 132	ret = crypto_aead_decrypt(req);133 134	if (ret == -EINPROGRESS)135		return;136 137	padata->info = ret;138	padata_do_serial(padata);139}140 141static int pcrypt_aead_decrypt(struct aead_request *req)142{143	int err;144	struct pcrypt_request *preq = aead_request_ctx(req);145	struct aead_request *creq = pcrypt_request_ctx(preq);146	struct padata_priv *padata = pcrypt_request_padata(preq);147	struct crypto_aead *aead = crypto_aead_reqtfm(req);148	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);149	u32 flags = aead_request_flags(req);150	struct pcrypt_instance_ctx *ictx;151 152	ictx = pcrypt_tfm_ictx(aead);153 154	memset(padata, 0, sizeof(struct padata_priv));155 156	padata->parallel = pcrypt_aead_dec;157	padata->serial = pcrypt_aead_serial;158 159	aead_request_set_tfm(creq, ctx->child);160	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,161				  pcrypt_aead_done, req);162	aead_request_set_crypt(creq, req->src, req->dst,163			       req->cryptlen, req->iv);164	aead_request_set_ad(creq, req->assoclen);165 166	err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu);167	if (!err)168		return -EINPROGRESS;169	if (err == -EBUSY)170		return -EAGAIN;171 172	return err;173}174 175static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)176{177	int cpu, cpu_index;178	struct aead_instance *inst = aead_alg_instance(tfm);179	struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);180	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);181	struct crypto_aead *cipher;182 183	cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %184		    cpumask_weight(cpu_online_mask);185 186	ctx->cb_cpu = cpumask_first(cpu_online_mask);187	for (cpu = 0; cpu < cpu_index; cpu++)188		ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);189 190	cipher = crypto_spawn_aead(&ictx->spawn);191 192	if (IS_ERR(cipher))193		return PTR_ERR(cipher);194 195	ctx->child = cipher;196	crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +197				     sizeof(struct aead_request) +198				     crypto_aead_reqsize(cipher));199 200	return 0;201}202 203static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)204{205	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);206 207	crypto_free_aead(ctx->child);208}209 210static void pcrypt_free(struct aead_instance *inst)211{212	struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);213 214	crypto_drop_aead(&ctx->spawn);215	padata_free_shell(ctx->psdec);216	padata_free_shell(ctx->psenc);217	kfree(inst);218}219 220static int pcrypt_init_instance(struct crypto_instance *inst,221				struct crypto_alg *alg)222{223	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,224		     "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)225		return -ENAMETOOLONG;226 227	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);228 229	inst->alg.cra_priority = alg->cra_priority + 100;230	inst->alg.cra_blocksize = alg->cra_blocksize;231	inst->alg.cra_alignmask = alg->cra_alignmask;232 233	return 0;234}235 236static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,237			      struct crypto_attr_type *algt)238{239	struct pcrypt_instance_ctx *ctx;240	struct aead_instance *inst;241	struct aead_alg *alg;242	u32 mask = crypto_algt_inherited_mask(algt);243	int err;244 245	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);246	if (!inst)247		return -ENOMEM;248 249	err = -ENOMEM;250 251	ctx = aead_instance_ctx(inst);252	ctx->psenc = padata_alloc_shell(pencrypt);253	if (!ctx->psenc)254		goto err_free_inst;255 256	ctx->psdec = padata_alloc_shell(pdecrypt);257	if (!ctx->psdec)258		goto err_free_inst;259 260	err = crypto_grab_aead(&ctx->spawn, aead_crypto_instance(inst),261			       crypto_attr_alg_name(tb[1]), 0, mask);262	if (err)263		goto err_free_inst;264 265	alg = crypto_spawn_aead_alg(&ctx->spawn);266	err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);267	if (err)268		goto err_free_inst;269 270	inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC;271 272	inst->alg.ivsize = crypto_aead_alg_ivsize(alg);273	inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);274 275	inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);276 277	inst->alg.init = pcrypt_aead_init_tfm;278	inst->alg.exit = pcrypt_aead_exit_tfm;279 280	inst->alg.setkey = pcrypt_aead_setkey;281	inst->alg.setauthsize = pcrypt_aead_setauthsize;282	inst->alg.encrypt = pcrypt_aead_encrypt;283	inst->alg.decrypt = pcrypt_aead_decrypt;284 285	inst->free = pcrypt_free;286 287	err = aead_register_instance(tmpl, inst);288	if (err) {289err_free_inst:290		pcrypt_free(inst);291	}292	return err;293}294 295static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)296{297	struct crypto_attr_type *algt;298 299	algt = crypto_get_attr_type(tb);300	if (IS_ERR(algt))301		return PTR_ERR(algt);302 303	switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {304	case CRYPTO_ALG_TYPE_AEAD:305		return pcrypt_create_aead(tmpl, tb, algt);306	}307 308	return -EINVAL;309}310 311static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)312{313	int ret;314 315	pinst->kobj.kset = pcrypt_kset;316	ret = kobject_add(&pinst->kobj, NULL, "%s", name);317	if (!ret)318		kobject_uevent(&pinst->kobj, KOBJ_ADD);319 320	return ret;321}322 323static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)324{325	int ret = -ENOMEM;326 327	*pinst = padata_alloc(name);328	if (!*pinst)329		return ret;330 331	ret = pcrypt_sysfs_add(*pinst, name);332	if (ret)333		padata_free(*pinst);334 335	return ret;336}337 338static struct crypto_template pcrypt_tmpl = {339	.name = "pcrypt",340	.create = pcrypt_create,341	.module = THIS_MODULE,342};343 344static int __init pcrypt_init(void)345{346	int err = -ENOMEM;347 348	pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);349	if (!pcrypt_kset)350		goto err;351 352	err = pcrypt_init_padata(&pencrypt, "pencrypt");353	if (err)354		goto err_unreg_kset;355 356	err = pcrypt_init_padata(&pdecrypt, "pdecrypt");357	if (err)358		goto err_deinit_pencrypt;359 360	return crypto_register_template(&pcrypt_tmpl);361 362err_deinit_pencrypt:363	padata_free(pencrypt);364err_unreg_kset:365	kset_unregister(pcrypt_kset);366err:367	return err;368}369 370static void __exit pcrypt_exit(void)371{372	crypto_unregister_template(&pcrypt_tmpl);373 374	padata_free(pencrypt);375	padata_free(pdecrypt);376 377	kset_unregister(pcrypt_kset);378}379 380subsys_initcall(pcrypt_init);381module_exit(pcrypt_exit);382 383MODULE_LICENSE("GPL");384MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");385MODULE_DESCRIPTION("Parallel crypto wrapper");386MODULE_ALIAS_CRYPTO("pcrypt");387