[mirror_ubuntu-hirsute-kernel.git] / crypto / pcrypt.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * pcrypt - Parallel crypto wrapper.
 *
 * Copyright (C) 2009 secunet Security Networks AG
 * Copyright (C) 2009 Steffen Klassert <steffen.klassert@secunet.com>
 */

#include <crypto/algapi.h>
#include <crypto/internal/aead.h>
#include <linux/atomic.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/notifier.h>
#include <linux/kobject.h>
#include <linux/cpu.h>
#include <crypto/pcrypt.h>

struct padata_pcrypt {
	struct padata_instance *pinst;

	/*
	 * Cpumask for callback CPUs. It should be
	 * equal to serial cpumask of corresponding padata instance,
	 * so it is updated when padata notifies us about serial
	 * cpumask change.
	 *
	 * cb_cpumask is protected by RCU. This fact prevents us from
	 * using cpumask_var_t directly because the actual type of
	 * cpumsak_var_t depends on kernel configuration(particularly on
	 * CONFIG_CPUMASK_OFFSTACK macro). Depending on the configuration
	 * cpumask_var_t may be either a pointer to the struct cpumask
	 * or a variable allocated on the stack. Thus we can not safely use
	 * cpumask_var_t with RCU operations such as rcu_assign_pointer or
	 * rcu_dereference. So cpumask_var_t is wrapped with struct
	 * pcrypt_cpumask which makes possible to use it with RCU.
	 */
	struct pcrypt_cpumask {
		cpumask_var_t mask;
	} *cb_cpumask;
	struct notifier_block nblock;
};

static struct padata_pcrypt pencrypt;
static struct padata_pcrypt pdecrypt;
static struct kset           *pcrypt_kset;

struct pcrypt_instance_ctx {
	struct crypto_aead_spawn spawn;
	atomic_t tfm_count;
};

struct pcrypt_aead_ctx {
	struct crypto_aead *child;
	unsigned int cb_cpu;
};

static int pcrypt_aead_setkey(struct crypto_aead *parent,
			      const u8 *key, unsigned int keylen)
{
	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);

	return crypto_aead_setkey(ctx->child, key, keylen);
}

static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
				   unsigned int authsize)
{
	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);

	return crypto_aead_setauthsize(ctx->child, authsize);
}

static void pcrypt_aead_serial(struct padata_priv *padata)
{
	struct pcrypt_request *preq = pcrypt_padata_request(padata);
	struct aead_request *req = pcrypt_request_ctx(preq);

	aead_request_complete(req->base.data, padata->info);
}

static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
{
	struct aead_request *req = areq->data;
	struct pcrypt_request *preq = aead_request_ctx(req);
	struct padata_priv *padata = pcrypt_request_padata(preq);

	padata->info = err;
	req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

	padata_do_serial(padata);
}

static void pcrypt_aead_enc(struct padata_priv *padata)
{
	struct pcrypt_request *preq = pcrypt_padata_request(padata);
	struct aead_request *req = pcrypt_request_ctx(preq);

	padata->info = crypto_aead_encrypt(req);

	if (padata->info == -EINPROGRESS)
		return;

	padata_do_serial(padata);
}

static int pcrypt_aead_encrypt(struct aead_request *req)
{
	int err;
	struct pcrypt_request *preq = aead_request_ctx(req);
	struct aead_request *creq = pcrypt_request_ctx(preq);
	struct padata_priv *padata = pcrypt_request_padata(preq);
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
	u32 flags = aead_request_flags(req);

	memset(padata, 0, sizeof(struct padata_priv));

	padata->parallel = pcrypt_aead_enc;
	padata->serial = pcrypt_aead_serial;

	aead_request_set_tfm(creq, ctx->child);
	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
				  pcrypt_aead_done, req);
	aead_request_set_crypt(creq, req->src, req->dst,
			       req->cryptlen, req->iv);
	aead_request_set_ad(creq, req->assoclen);

	err = padata_do_parallel(pencrypt.pinst, padata, &ctx->cb_cpu);
	if (!err)
		return -EINPROGRESS;

	return err;
}

static void pcrypt_aead_dec(struct padata_priv *padata)
{
	struct pcrypt_request *preq = pcrypt_padata_request(padata);
	struct aead_request *req = pcrypt_request_ctx(preq);

	padata->info = crypto_aead_decrypt(req);

	if (padata->info == -EINPROGRESS)
		return;

	padata_do_serial(padata);
}

static int pcrypt_aead_decrypt(struct aead_request *req)
{
	int err;
	struct pcrypt_request *preq = aead_request_ctx(req);
	struct aead_request *creq = pcrypt_request_ctx(preq);
	struct padata_priv *padata = pcrypt_request_padata(preq);
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
	u32 flags = aead_request_flags(req);

	memset(padata, 0, sizeof(struct padata_priv));

	padata->parallel = pcrypt_aead_dec;
	padata->serial = pcrypt_aead_serial;

	aead_request_set_tfm(creq, ctx->child);
	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
				  pcrypt_aead_done, req);
	aead_request_set_crypt(creq, req->src, req->dst,
			       req->cryptlen, req->iv);
	aead_request_set_ad(creq, req->assoclen);

	err = padata_do_parallel(pdecrypt.pinst, padata, &ctx->cb_cpu);
	if (!err)
		return -EINPROGRESS;

	return err;
}

static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
{
	int cpu, cpu_index;
	struct aead_instance *inst = aead_alg_instance(tfm);
	struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
	struct crypto_aead *cipher;

	cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
		    cpumask_weight(cpu_online_mask);

	ctx->cb_cpu = cpumask_first(cpu_online_mask);
	for (cpu = 0; cpu < cpu_index; cpu++)
		ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);

	cipher = crypto_spawn_aead(&ictx->spawn);

	if (IS_ERR(cipher))
		return PTR_ERR(cipher);

	ctx->child = cipher;
	crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
				     sizeof(struct aead_request) +
				     crypto_aead_reqsize(cipher));

	return 0;
}

static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
{
	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);

	crypto_free_aead(ctx->child);
}

static void pcrypt_free(struct aead_instance *inst)
{
	struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);

	crypto_drop_aead(&ctx->spawn);
	kfree(inst);
}

static int pcrypt_init_instance(struct crypto_instance *inst,
				struct crypto_alg *alg)
{
	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
		     "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
		return -ENAMETOOLONG;

	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);

	inst->alg.cra_priority = alg->cra_priority + 100;
	inst->alg.cra_blocksize = alg->cra_blocksize;
	inst->alg.cra_alignmask = alg->cra_alignmask;

	return 0;
}

static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
			      u32 type, u32 mask)
{
	struct pcrypt_instance_ctx *ctx;
	struct crypto_attr_type *algt;
	struct aead_instance *inst;
	struct aead_alg *alg;
	const char *name;
	int err;

	algt = crypto_get_attr_type(tb);
	if (IS_ERR(algt))
		return PTR_ERR(algt);

	name = crypto_attr_alg_name(tb[1]);
	if (IS_ERR(name))
		return PTR_ERR(name);

	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
	if (!inst)
		return -ENOMEM;

	ctx = aead_instance_ctx(inst);
	crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst));

	err = crypto_grab_aead(&ctx->spawn, name, 0, 0);
	if (err)
		goto out_free_inst;

	alg = crypto_spawn_aead_alg(&ctx->spawn);
	err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
	if (err)
		goto out_drop_aead;

	inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC;

	inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
	inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);

	inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);

	inst->alg.init = pcrypt_aead_init_tfm;
	inst->alg.exit = pcrypt_aead_exit_tfm;

	inst->alg.setkey = pcrypt_aead_setkey;
	inst->alg.setauthsize = pcrypt_aead_setauthsize;
	inst->alg.encrypt = pcrypt_aead_encrypt;
	inst->alg.decrypt = pcrypt_aead_decrypt;

	inst->free = pcrypt_free;

	err = aead_register_instance(tmpl, inst);
	if (err)
		goto out_drop_aead;

out:
	return err;

out_drop_aead:
	crypto_drop_aead(&ctx->spawn);
out_free_inst:
	kfree(inst);
	goto out;
}

static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
{
	struct crypto_attr_type *algt;

	algt = crypto_get_attr_type(tb);
	if (IS_ERR(algt))
		return PTR_ERR(algt);

	switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
	case CRYPTO_ALG_TYPE_AEAD:
		return pcrypt_create_aead(tmpl, tb, algt->type, algt->mask);
	}

	return -EINVAL;
}

static int pcrypt_cpumask_change_notify(struct notifier_block *self,
					unsigned long val, void *data)
{
	struct padata_pcrypt *pcrypt;
	struct pcrypt_cpumask *new_mask, *old_mask;
	struct padata_cpumask *cpumask = (struct padata_cpumask *)data;

	if (!(val & PADATA_CPU_SERIAL))
		return 0;

	pcrypt = container_of(self, struct padata_pcrypt, nblock);
	new_mask = kmalloc(sizeof(*new_mask), GFP_KERNEL);
	if (!new_mask)
		return -ENOMEM;
	if (!alloc_cpumask_var(&new_mask->mask, GFP_KERNEL)) {
		kfree(new_mask);
		return -ENOMEM;
	}

	old_mask = pcrypt->cb_cpumask;

	cpumask_copy(new_mask->mask, cpumask->cbcpu);
	rcu_assign_pointer(pcrypt->cb_cpumask, new_mask);
	synchronize_rcu();

	free_cpumask_var(old_mask->mask);
	kfree(old_mask);
	return 0;
}

static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
{
	int ret;

	pinst->kobj.kset = pcrypt_kset;
	ret = kobject_add(&pinst->kobj, NULL, "%s", name);
	if (!ret)
		kobject_uevent(&pinst->kobj, KOBJ_ADD);

	return ret;
}

static int pcrypt_init_padata(struct padata_pcrypt *pcrypt,
			      const char *name)
{
	int ret = -ENOMEM;
	struct pcrypt_cpumask *mask;

	get_online_cpus();

	pcrypt->pinst = padata_alloc_possible(name);
	if (!pcrypt->pinst)
		goto err;

	mask = kmalloc(sizeof(*mask), GFP_KERNEL);
	if (!mask)
		goto err_free_padata;
	if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) {
		kfree(mask);
		goto err_free_padata;
	}

	cpumask_and(mask->mask, cpu_possible_mask, cpu_online_mask);
	rcu_assign_pointer(pcrypt->cb_cpumask, mask);

	pcrypt->nblock.notifier_call = pcrypt_cpumask_change_notify;
	ret = padata_register_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
	if (ret)
		goto err_free_cpumask;

	ret = pcrypt_sysfs_add(pcrypt->pinst, name);
	if (ret)
		goto err_unregister_notifier;

	put_online_cpus();

	return ret;

err_unregister_notifier:
	padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
err_free_cpumask:
	free_cpumask_var(mask->mask);
	kfree(mask);
err_free_padata:
	padata_free(pcrypt->pinst);
err:
	put_online_cpus();

	return ret;
}

static void pcrypt_fini_padata(struct padata_pcrypt *pcrypt)
{
	free_cpumask_var(pcrypt->cb_cpumask->mask);
	kfree(pcrypt->cb_cpumask);

	padata_stop(pcrypt->pinst);
	padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
	padata_free(pcrypt->pinst);
}

static struct crypto_template pcrypt_tmpl = {
	.name = "pcrypt",
	.create = pcrypt_create,
	.module = THIS_MODULE,
};

static int __init pcrypt_init(void)
{
	int err = -ENOMEM;

	pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
	if (!pcrypt_kset)
		goto err;

	err = pcrypt_init_padata(&pencrypt, "pencrypt");
	if (err)
		goto err_unreg_kset;

	err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
	if (err)
		goto err_deinit_pencrypt;

	padata_start(pencrypt.pinst);
	padata_start(pdecrypt.pinst);

	return crypto_register_template(&pcrypt_tmpl);

err_deinit_pencrypt:
	pcrypt_fini_padata(&pencrypt);
err_unreg_kset:
	kset_unregister(pcrypt_kset);
err:
	return err;
}

static void __exit pcrypt_exit(void)
{
	pcrypt_fini_padata(&pencrypt);
	pcrypt_fini_padata(&pdecrypt);

	kset_unregister(pcrypt_kset);
	crypto_unregister_template(&pcrypt_tmpl);
}

subsys_initcall(pcrypt_init);
module_exit(pcrypt_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
MODULE_DESCRIPTION("Parallel crypto wrapper");
MODULE_ALIAS_CRYPTO("pcrypt");
Commit	Line	Data
a61127c2	1	// SPDX-License-Identifier: GPL-2.0-only
5068c7a8 SK	2	/*
	3	* pcrypt - Parallel crypto wrapper.
	4	*
	5	* Copyright (C) 2009 secunet Security Networks AG
	6	* Copyright (C) 2009 Steffen Klassert <steffen.klassert@secunet.com>
5068c7a8 SK	7	*/
	8
	9	#include <crypto/algapi.h>
	10	#include <crypto/internal/aead.h>
a5a22e57	11	#include <linux/atomic.h>
5068c7a8 SK	12	#include <linux/err.h>
	13	#include <linux/init.h>
	14	#include <linux/module.h>
	15	#include <linux/slab.h>
e15bacbe	16	#include <linux/notifier.h>
a3fb1e33	17	#include <linux/kobject.h>
d3f64e46	18	#include <linux/cpu.h>
5068c7a8 SK	19	#include <crypto/pcrypt.h>
5068c7a8 SK	20
c57e842e	21	struct padata_pcrypt {
e15bacbe	22	struct padata_instance *pinst;
e15bacbe DK	23
	24	/*
	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
	28	* cpumask change.
	29	*
	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.
	39	*/
	40	struct pcrypt_cpumask {
	41	cpumask_var_t mask;
	42	} *cb_cpumask;
	43	struct notifier_block nblock;
	44	};
	45
c57e842e SK	46	static struct padata_pcrypt pencrypt;
c57e842e SK	47	static struct padata_pcrypt pdecrypt;
a3fb1e33	48	static struct kset *pcrypt_kset;
5068c7a8 SK	49
5068c7a8 SK	50	struct pcrypt_instance_ctx {
66d948e7	51	struct crypto_aead_spawn spawn;
a5a22e57	52	atomic_t tfm_count;
5068c7a8 SK	53	};
	54
	55	struct pcrypt_aead_ctx {
	56	struct crypto_aead *child;
	57	unsigned int cb_cpu;
	58	};
	59
5068c7a8 SK	60	static int pcrypt_aead_setkey(struct crypto_aead *parent,
	61	const u8 *key, unsigned int keylen)
	62	{
	63	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
	64
	65	return crypto_aead_setkey(ctx->child, key, keylen);
	66	}
	67
	68	static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
	69	unsigned int authsize)
	70	{
	71	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
	72
	73	return crypto_aead_setauthsize(ctx->child, authsize);
	74	}
	75
	76	static void pcrypt_aead_serial(struct padata_priv *padata)
	77	{
	78	struct pcrypt_request *preq = pcrypt_padata_request(padata);
	79	struct aead_request *req = pcrypt_request_ctx(preq);
	80
	81	aead_request_complete(req->base.data, padata->info);
	82	}
	83
5068c7a8 SK	84	static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
	85	{
	86	struct aead_request *req = areq->data;
	87	struct pcrypt_request *preq = aead_request_ctx(req);
	88	struct padata_priv *padata = pcrypt_request_padata(preq);
	89
	90	padata->info = err;
	91	req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	92
	93	padata_do_serial(padata);
	94	}
	95
	96	static void pcrypt_aead_enc(struct padata_priv *padata)
	97	{
	98	struct pcrypt_request *preq = pcrypt_padata_request(padata);
	99	struct aead_request *req = pcrypt_request_ctx(preq);
	100
	101	padata->info = crypto_aead_encrypt(req);
	102
5a1436be	103	if (padata->info == -EINPROGRESS)
5068c7a8 SK	104	return;
	105
	106	padata_do_serial(padata);
	107	}
	108
	109	static int pcrypt_aead_encrypt(struct aead_request *req)
	110	{
	111	int err;
	112	struct pcrypt_request *preq = aead_request_ctx(req);
	113	struct aead_request *creq = pcrypt_request_ctx(preq);
	114	struct padata_priv *padata = pcrypt_request_padata(preq);
	115	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	116	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
	117	u32 flags = aead_request_flags(req);
	118
	119	memset(padata, 0, sizeof(struct padata_priv));
	120
	121	padata->parallel = pcrypt_aead_enc;
	122	padata->serial = pcrypt_aead_serial;
	123
	124	aead_request_set_tfm(creq, ctx->child);
	125	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
	126	pcrypt_aead_done, req);
	127	aead_request_set_crypt(creq, req->src, req->dst,
	128	req->cryptlen, req->iv);
0496f560	129	aead_request_set_ad(creq, req->assoclen);
5068c7a8	130
e6ce0e08	131	err = padata_do_parallel(pencrypt.pinst, padata, &ctx->cb_cpu);
83f619f3 SK	132	if (!err)
83f619f3 SK	133	return -EINPROGRESS;
5068c7a8 SK	134
	135	return err;
	136	}
	137
	138	static void pcrypt_aead_dec(struct padata_priv *padata)
	139	{
	140	struct pcrypt_request *preq = pcrypt_padata_request(padata);
	141	struct aead_request *req = pcrypt_request_ctx(preq);
	142
	143	padata->info = crypto_aead_decrypt(req);
	144
5a1436be	145	if (padata->info == -EINPROGRESS)
5068c7a8 SK	146	return;
	147
	148	padata_do_serial(padata);
	149	}
	150
	151	static int pcrypt_aead_decrypt(struct aead_request *req)
	152	{
	153	int err;
	154	struct pcrypt_request *preq = aead_request_ctx(req);
	155	struct aead_request *creq = pcrypt_request_ctx(preq);
	156	struct padata_priv *padata = pcrypt_request_padata(preq);
	157	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	158	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
	159	u32 flags = aead_request_flags(req);
	160
	161	memset(padata, 0, sizeof(struct padata_priv));
	162
	163	padata->parallel = pcrypt_aead_dec;
	164	padata->serial = pcrypt_aead_serial;
	165
	166	aead_request_set_tfm(creq, ctx->child);
	167	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
	168	pcrypt_aead_done, req);
	169	aead_request_set_crypt(creq, req->src, req->dst,
	170	req->cryptlen, req->iv);
0496f560	171	aead_request_set_ad(creq, req->assoclen);
5068c7a8	172
e6ce0e08	173	err = padata_do_parallel(pdecrypt.pinst, padata, &ctx->cb_cpu);
83f619f3 SK	174	if (!err)
83f619f3 SK	175	return -EINPROGRESS;
5068c7a8 SK	176
	177	return err;
	178	}
	179
0496f560	180	static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
5068c7a8 SK	181	{
5068c7a8 SK	182	int cpu, cpu_index;
0496f560 HX	183	struct aead_instance *inst = aead_alg_instance(tfm);
	184	struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
	185	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
5068c7a8 SK	186	struct crypto_aead *cipher;
5068c7a8 SK	187
a5a22e57 HX	188	cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
a5a22e57 HX	189	cpumask_weight(cpu_online_mask);
5068c7a8	190
fbf0ca1b	191	ctx->cb_cpu = cpumask_first(cpu_online_mask);
5068c7a8	192	for (cpu = 0; cpu < cpu_index; cpu++)
fbf0ca1b	193	ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
5068c7a8	194
0496f560	195	cipher = crypto_spawn_aead(&ictx->spawn);
5068c7a8 SK	196
	197	if (IS_ERR(cipher))
	198	return PTR_ERR(cipher);
	199
	200	ctx->child = cipher;
0496f560 HX	201	crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
	202	sizeof(struct aead_request) +
	203	crypto_aead_reqsize(cipher));
5068c7a8 SK	204
	205	return 0;
	206	}
	207
0496f560	208	static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
5068c7a8	209	{
0496f560	210	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
5068c7a8 SK	211
	212	crypto_free_aead(ctx->child);
	213	}
	214
d76c6810 EB	215	static void pcrypt_free(struct aead_instance *inst)
	216	{
	217	struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);
	218
	219	crypto_drop_aead(&ctx->spawn);
	220	kfree(inst);
	221	}
	222
66d948e7 HX	223	static int pcrypt_init_instance(struct crypto_instance *inst,
66d948e7 HX	224	struct crypto_alg *alg)
5068c7a8	225	{
5068c7a8 SK	226	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
5068c7a8 SK	227	"pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
66d948e7	228	return -ENAMETOOLONG;
5068c7a8 SK	229
	230	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
	231
5068c7a8 SK	232	inst->alg.cra_priority = alg->cra_priority + 100;
	233	inst->alg.cra_blocksize = alg->cra_blocksize;
	234	inst->alg.cra_alignmask = alg->cra_alignmask;
	235
66d948e7	236	return 0;
5068c7a8 SK	237	}
5068c7a8 SK	238
0496f560 HX	239	static int pcrypt_create_aead(struct crypto_template tmpl, struct rtattr *tb,
0496f560 HX	240	u32 type, u32 mask)
5068c7a8	241	{
66d948e7	242	struct pcrypt_instance_ctx *ctx;
846f97df	243	struct crypto_attr_type *algt;
0496f560 HX	244	struct aead_instance *inst;
0496f560 HX	245	struct aead_alg *alg;
66d948e7 HX	246	const char *name;
	247	int err;
	248
846f97df HX	249	algt = crypto_get_attr_type(tb);
	250	if (IS_ERR(algt))
	251	return PTR_ERR(algt);
	252
66d948e7 HX	253	name = crypto_attr_alg_name(tb[1]);
66d948e7 HX	254	if (IS_ERR(name))
0496f560	255	return PTR_ERR(name);
66d948e7 HX	256
	257	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
	258	if (!inst)
0496f560	259	return -ENOMEM;
66d948e7	260
0496f560 HX	261	ctx = aead_instance_ctx(inst);
0496f560 HX	262	crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst));
5068c7a8	263
5e4b8c1f	264	err = crypto_grab_aead(&ctx->spawn, name, 0, 0);
66d948e7 HX	265	if (err)
66d948e7 HX	266	goto out_free_inst;
5068c7a8	267
0496f560 HX	268	alg = crypto_spawn_aead_alg(&ctx->spawn);
0496f560 HX	269	err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
66d948e7 HX	270	if (err)
66d948e7 HX	271	goto out_drop_aead;
5068c7a8	272
846f97df	273	inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC;
846f97df	274
0496f560 HX	275	inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
0496f560 HX	276	inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
5068c7a8	277
0496f560	278	inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
5068c7a8	279
0496f560 HX	280	inst->alg.init = pcrypt_aead_init_tfm;
0496f560 HX	281	inst->alg.exit = pcrypt_aead_exit_tfm;
5068c7a8	282
0496f560 HX	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;
5068c7a8	287
d76c6810 EB	288	inst->free = pcrypt_free;
d76c6810 EB	289
0496f560 HX	290	err = aead_register_instance(tmpl, inst);
	291	if (err)
	292	goto out_drop_aead;
5068c7a8	293
66d948e7	294	out:
0496f560	295	return err;
66d948e7 HX	296
	297	out_drop_aead:
	298	crypto_drop_aead(&ctx->spawn);
	299	out_free_inst:
	300	kfree(inst);
66d948e7	301	goto out;
5068c7a8 SK	302	}
5068c7a8 SK	303
0496f560	304	static int pcrypt_create(struct crypto_template tmpl, struct rtattr *tb)
5068c7a8 SK	305	{
	306	struct crypto_attr_type *algt;
	307
	308	algt = crypto_get_attr_type(tb);
	309	if (IS_ERR(algt))
0496f560	310	return PTR_ERR(algt);
5068c7a8 SK	311
	312	switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
	313	case CRYPTO_ALG_TYPE_AEAD:
0496f560	314	return pcrypt_create_aead(tmpl, tb, algt->type, algt->mask);
5068c7a8 SK	315	}
5068c7a8 SK	316
0496f560	317	return -EINVAL;
5068c7a8 SK	318	}
5068c7a8 SK	319
e15bacbe DK	320	static int pcrypt_cpumask_change_notify(struct notifier_block *self,
	321	unsigned long val, void *data)
	322	{
c57e842e	323	struct padata_pcrypt *pcrypt;
e15bacbe	324	struct pcrypt_cpumask new_mask, old_mask;
d3f64e46	325	struct padata_cpumask cpumask = (struct padata_cpumask )data;
e15bacbe DK	326
	327	if (!(val & PADATA_CPU_SERIAL))
	328	return 0;
	329
c57e842e	330	pcrypt = container_of(self, struct padata_pcrypt, nblock);
e15bacbe DK	331	new_mask = kmalloc(sizeof(*new_mask), GFP_KERNEL);
	332	if (!new_mask)
	333	return -ENOMEM;
	334	if (!alloc_cpumask_var(&new_mask->mask, GFP_KERNEL)) {
	335	kfree(new_mask);
	336	return -ENOMEM;
	337	}
	338
	339	old_mask = pcrypt->cb_cpumask;
	340
d3f64e46	341	cpumask_copy(new_mask->mask, cpumask->cbcpu);
e15bacbe	342	rcu_assign_pointer(pcrypt->cb_cpumask, new_mask);
a0076e17	343	synchronize_rcu();
e15bacbe DK	344
	345	free_cpumask_var(old_mask->mask);
	346	kfree(old_mask);
	347	return 0;
	348	}
	349
a3fb1e33 DK	350	static int pcrypt_sysfs_add(struct padata_instance pinst, const char name)
	351	{
	352	int ret;
	353
	354	pinst->kobj.kset = pcrypt_kset;
b1e3874c	355	ret = kobject_add(&pinst->kobj, NULL, "%s", name);
a3fb1e33 DK	356	if (!ret)
	357	kobject_uevent(&pinst->kobj, KOBJ_ADD);
	358
	359	return ret;
	360	}
	361
c57e842e SK	362	static int pcrypt_init_padata(struct padata_pcrypt *pcrypt,
c57e842e SK	363	const char *name)
e15bacbe DK	364	{
	365	int ret = -ENOMEM;
	366	struct pcrypt_cpumask *mask;
	367
d3f64e46 SK	368	get_online_cpus();
d3f64e46 SK	369
b128a304	370	pcrypt->pinst = padata_alloc_possible(name);
e15bacbe	371	if (!pcrypt->pinst)
b128a304	372	goto err;
e15bacbe DK	373
	374	mask = kmalloc(sizeof(*mask), GFP_KERNEL);
	375	if (!mask)
	376	goto err_free_padata;
	377	if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) {
	378	kfree(mask);
	379	goto err_free_padata;
	380	}
	381
fbf0ca1b	382	cpumask_and(mask->mask, cpu_possible_mask, cpu_online_mask);
e15bacbe DK	383	rcu_assign_pointer(pcrypt->cb_cpumask, mask);
	384
	385	pcrypt->nblock.notifier_call = pcrypt_cpumask_change_notify;
	386	ret = padata_register_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
	387	if (ret)
	388	goto err_free_cpumask;
	389
a3fb1e33 DK	390	ret = pcrypt_sysfs_add(pcrypt->pinst, name);
	391	if (ret)
	392	goto err_unregister_notifier;
	393
d3f64e46 SK	394	put_online_cpus();
d3f64e46 SK	395
e15bacbe	396	return ret;
d3f64e46	397
a3fb1e33 DK	398	err_unregister_notifier:
a3fb1e33 DK	399	padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
e15bacbe DK	400	err_free_cpumask:
	401	free_cpumask_var(mask->mask);
	402	kfree(mask);
	403	err_free_padata:
	404	padata_free(pcrypt->pinst);
e15bacbe	405	err:
d3f64e46 SK	406	put_online_cpus();
d3f64e46 SK	407
e15bacbe DK	408	return ret;
	409	}
	410
c57e842e	411	static void pcrypt_fini_padata(struct padata_pcrypt *pcrypt)
e15bacbe DK	412	{
	413	free_cpumask_var(pcrypt->cb_cpumask->mask);
	414	kfree(pcrypt->cb_cpumask);
	415
	416	padata_stop(pcrypt->pinst);
	417	padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
e15bacbe DK	418	padata_free(pcrypt->pinst);
	419	}
	420
5068c7a8 SK	421	static struct crypto_template pcrypt_tmpl = {
5068c7a8 SK	422	.name = "pcrypt",
0496f560	423	.create = pcrypt_create,
5068c7a8 SK	424	.module = THIS_MODULE,
	425	};
	426
	427	static int __init pcrypt_init(void)
	428	{
a3fb1e33 DK	429	int err = -ENOMEM;
	430
	431	pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
	432	if (!pcrypt_kset)
	433	goto err;
5068c7a8	434
c57e842e	435	err = pcrypt_init_padata(&pencrypt, "pencrypt");
4c879170	436	if (err)
a3fb1e33	437	goto err_unreg_kset;
4c879170	438
c57e842e	439	err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
4c879170	440	if (err)
e15bacbe	441	goto err_deinit_pencrypt;
4c879170	442
e15bacbe DK	443	padata_start(pencrypt.pinst);
e15bacbe DK	444	padata_start(pdecrypt.pinst);
5068c7a8	445
e15bacbe	446	return crypto_register_template(&pcrypt_tmpl);
5068c7a8	447
e15bacbe	448	err_deinit_pencrypt:
c57e842e	449	pcrypt_fini_padata(&pencrypt);
a3fb1e33 DK	450	err_unreg_kset:
a3fb1e33 DK	451	kset_unregister(pcrypt_kset);
5068c7a8	452	err:
4c879170	453	return err;
5068c7a8 SK	454	}
	455
	456	static void __exit pcrypt_exit(void)
	457	{
c57e842e SK	458	pcrypt_fini_padata(&pencrypt);
c57e842e SK	459	pcrypt_fini_padata(&pdecrypt);
5068c7a8	460
a3fb1e33	461	kset_unregister(pcrypt_kset);
5068c7a8 SK	462	crypto_unregister_template(&pcrypt_tmpl);
	463	}
	464
c4741b23	465	subsys_initcall(pcrypt_init);
5068c7a8 SK	466	module_exit(pcrypt_exit);
	467
	468	MODULE_LICENSE("GPL");
	469	MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
	470	MODULE_DESCRIPTION("Parallel crypto wrapper");
4943ba16	471	MODULE_ALIAS_CRYPTO("pcrypt");