[GitHub/mt8127/android_kernel_alcatel_ttab.git] / crypto / algapi.c

/*
 * Cryptographic API for algorithms (i.e., low-level API).
 *
 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <linux/err.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
#include <linux/string.h>

#include "internal.h"

static LIST_HEAD(crypto_template_list);

void crypto_larval_error(const char *name, u32 type, u32 mask)
{
	struct crypto_alg *alg;

	down_read(&crypto_alg_sem);
	alg = __crypto_alg_lookup(name, type, mask);
	up_read(&crypto_alg_sem);

	if (alg) {
		if (crypto_is_larval(alg)) {
			struct crypto_larval *larval = (void *)alg;
			complete(&larval->completion);
		}
		crypto_mod_put(alg);
	}
}
EXPORT_SYMBOL_GPL(crypto_larval_error);

static inline int crypto_set_driver_name(struct crypto_alg *alg)
{
	static const char suffix[] = "-generic";
	char *driver_name = alg->cra_driver_name;
	int len;

	if (*driver_name)
		return 0;

	len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
	if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
		return -ENAMETOOLONG;

	memcpy(driver_name + len, suffix, sizeof(suffix));
	return 0;
}

static int crypto_check_alg(struct crypto_alg *alg)
{
	if (alg->cra_alignmask & (alg->cra_alignmask + 1))
		return -EINVAL;

	if (alg->cra_alignmask & alg->cra_blocksize)
		return -EINVAL;

	if (alg->cra_blocksize > PAGE_SIZE / 8)
		return -EINVAL;

	if (alg->cra_priority < 0)
		return -EINVAL;

	return crypto_set_driver_name(alg);
}

static void crypto_destroy_instance(struct crypto_alg *alg)
{
	struct crypto_instance *inst = (void *)alg;
	struct crypto_template *tmpl = inst->tmpl;

	tmpl->free(inst);
	crypto_tmpl_put(tmpl);
}

static void crypto_remove_spawns(struct list_head *spawns,
				 struct list_head *list)
{
	struct crypto_spawn *spawn, *n;

	list_for_each_entry_safe(spawn, n, spawns, list) {
		struct crypto_instance *inst = spawn->inst;
		struct crypto_template *tmpl = inst->tmpl;

		list_del_init(&spawn->list);
		spawn->alg = NULL;

		if (crypto_is_dead(&inst->alg))
			continue;

		inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
		if (!tmpl || !crypto_tmpl_get(tmpl))
			continue;

		crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
		list_move(&inst->alg.cra_list, list);
		hlist_del(&inst->list);
		inst->alg.cra_destroy = crypto_destroy_instance;

		if (!list_empty(&inst->alg.cra_users)) {
			if (&n->list == spawns)
				n = list_entry(inst->alg.cra_users.next,
					       typeof(*n), list);
			__list_splice(&inst->alg.cra_users, spawns->prev);
		}
	}
}

static int __crypto_register_alg(struct crypto_alg *alg,
				 struct list_head *list)
{
	struct crypto_alg *q;
	int ret = -EAGAIN;

	if (crypto_is_dead(alg))
		goto out;

	INIT_LIST_HEAD(&alg->cra_users);

	ret = -EEXIST;

	atomic_set(&alg->cra_refcnt, 1);
	list_for_each_entry(q, &crypto_alg_list, cra_list) {
		if (q == alg)
			goto out;

		if (crypto_is_moribund(q))
			continue;

		if (crypto_is_larval(q)) {
			struct crypto_larval *larval = (void *)q;

			if (strcmp(alg->cra_name, q->cra_name) &&
			    strcmp(alg->cra_driver_name, q->cra_name))
				continue;

			if (larval->adult)
				continue;
			if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
				continue;
			if (!crypto_mod_get(alg))
				continue;

			larval->adult = alg;
			complete(&larval->completion);
			continue;
		}

		if (strcmp(alg->cra_name, q->cra_name))
			continue;

		if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
		    q->cra_priority > alg->cra_priority)
			continue;

		crypto_remove_spawns(&q->cra_users, list);
	}
	
	list_add(&alg->cra_list, &crypto_alg_list);

	crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg);
	ret = 0;

out:	
	return ret;
}

static void crypto_remove_final(struct list_head *list)
{
	struct crypto_alg *alg;
	struct crypto_alg *n;

	list_for_each_entry_safe(alg, n, list, cra_list) {
		list_del_init(&alg->cra_list);
		crypto_alg_put(alg);
	}
}

int crypto_register_alg(struct crypto_alg *alg)
{
	LIST_HEAD(list);
	int err;

	err = crypto_check_alg(alg);
	if (err)
		return err;

	down_write(&crypto_alg_sem);
	err = __crypto_register_alg(alg, &list);
	up_write(&crypto_alg_sem);

	crypto_remove_final(&list);
	return err;
}
EXPORT_SYMBOL_GPL(crypto_register_alg);

static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
{
	if (unlikely(list_empty(&alg->cra_list)))
		return -ENOENT;

	alg->cra_flags |= CRYPTO_ALG_DEAD;

	crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
	list_del_init(&alg->cra_list);
	crypto_remove_spawns(&alg->cra_users, list);

	return 0;
}

int crypto_unregister_alg(struct crypto_alg *alg)
{
	int ret;
	LIST_HEAD(list);
	
	down_write(&crypto_alg_sem);
	ret = crypto_remove_alg(alg, &list);
	up_write(&crypto_alg_sem);

	if (ret)
		return ret;

	BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
	if (alg->cra_destroy)
		alg->cra_destroy(alg);

	crypto_remove_final(&list);
	return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_alg);

int crypto_register_template(struct crypto_template *tmpl)
{
	struct crypto_template *q;
	int err = -EEXIST;

	down_write(&crypto_alg_sem);

	list_for_each_entry(q, &crypto_template_list, list) {
		if (q == tmpl)
			goto out;
	}

	list_add(&tmpl->list, &crypto_template_list);
	crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
	err = 0;
out:
	up_write(&crypto_alg_sem);
	return err;
}
EXPORT_SYMBOL_GPL(crypto_register_template);

void crypto_unregister_template(struct crypto_template *tmpl)
{
	struct crypto_instance *inst;
	struct hlist_node *p, *n;
	struct hlist_head *list;
	LIST_HEAD(users);

	down_write(&crypto_alg_sem);

	BUG_ON(list_empty(&tmpl->list));
	list_del_init(&tmpl->list);

	list = &tmpl->instances;
	hlist_for_each_entry(inst, p, list, list) {
		int err = crypto_remove_alg(&inst->alg, &users);
		BUG_ON(err);
	}

	crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);

	up_write(&crypto_alg_sem);

	hlist_for_each_entry_safe(inst, p, n, list, list) {
		BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
		tmpl->free(inst);
	}
	crypto_remove_final(&users);
}
EXPORT_SYMBOL_GPL(crypto_unregister_template);

static struct crypto_template *__crypto_lookup_template(const char *name)
{
	struct crypto_template *q, *tmpl = NULL;

	down_read(&crypto_alg_sem);
	list_for_each_entry(q, &crypto_template_list, list) {
		if (strcmp(q->name, name))
			continue;
		if (unlikely(!crypto_tmpl_get(q)))
			continue;

		tmpl = q;
		break;
	}
	up_read(&crypto_alg_sem);

	return tmpl;
}

struct crypto_template *crypto_lookup_template(const char *name)
{
	return try_then_request_module(__crypto_lookup_template(name), name);
}
EXPORT_SYMBOL_GPL(crypto_lookup_template);

int crypto_register_instance(struct crypto_template *tmpl,
			     struct crypto_instance *inst)
{
	LIST_HEAD(list);
	int err = -EINVAL;

	if (inst->alg.cra_destroy)
		goto err;

	err = crypto_check_alg(&inst->alg);
	if (err)
		goto err;

	inst->alg.cra_module = tmpl->module;

	down_write(&crypto_alg_sem);

	err = __crypto_register_alg(&inst->alg, &list);
	if (err)
		goto unlock;

	hlist_add_head(&inst->list, &tmpl->instances);
	inst->tmpl = tmpl;

unlock:
	up_write(&crypto_alg_sem);

	crypto_remove_final(&list);

err:
	return err;
}
EXPORT_SYMBOL_GPL(crypto_register_instance);

int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
		      struct crypto_instance *inst)
{
	int err = -EAGAIN;

	spawn->inst = inst;

	down_write(&crypto_alg_sem);
	if (!crypto_is_moribund(alg)) {
		list_add(&spawn->list, &alg->cra_users);
		spawn->alg = alg;
		err = 0;
	}
	up_write(&crypto_alg_sem);

	return err;
}
EXPORT_SYMBOL_GPL(crypto_init_spawn);

void crypto_drop_spawn(struct crypto_spawn *spawn)
{
	down_write(&crypto_alg_sem);
	list_del(&spawn->list);
	up_write(&crypto_alg_sem);
}
EXPORT_SYMBOL_GPL(crypto_drop_spawn);

struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
				    u32 mask)
{
	struct crypto_alg *alg;
	struct crypto_alg *alg2;
	struct crypto_tfm *tfm;

	down_read(&crypto_alg_sem);
	alg = spawn->alg;
	alg2 = alg;
	if (alg2)
		alg2 = crypto_mod_get(alg2);
	up_read(&crypto_alg_sem);

	if (!alg2) {
		if (alg)
			crypto_shoot_alg(alg);
		return ERR_PTR(-EAGAIN);
	}

	tfm = ERR_PTR(-EINVAL);
	if (unlikely((alg->cra_flags ^ type) & mask))
		goto out_put_alg;

	tfm = __crypto_alloc_tfm(alg, type, mask);
	if (IS_ERR(tfm))
		goto out_put_alg;

	return tfm;

out_put_alg:
	crypto_mod_put(alg);
	return tfm;
}
EXPORT_SYMBOL_GPL(crypto_spawn_tfm);

int crypto_register_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&crypto_chain, nb);
}
EXPORT_SYMBOL_GPL(crypto_register_notifier);

int crypto_unregister_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_unregister(&crypto_chain, nb);
}
EXPORT_SYMBOL_GPL(crypto_unregister_notifier);

struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
{
	struct rtattr *rta = tb[CRYPTOA_TYPE - 1];
	struct crypto_attr_type *algt;

	if (!rta)
		return ERR_PTR(-ENOENT);
	if (RTA_PAYLOAD(rta) < sizeof(*algt))
		return ERR_PTR(-EINVAL);

	algt = RTA_DATA(rta);

	return algt;
}
EXPORT_SYMBOL_GPL(crypto_get_attr_type);

int crypto_check_attr_type(struct rtattr **tb, u32 type)
{
	struct crypto_attr_type *algt;

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

	if ((algt->type ^ type) & algt->mask)
		return -EINVAL;

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_check_attr_type);

struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb, u32 type, u32 mask)
{
	struct rtattr *rta = tb[CRYPTOA_ALG - 1];
	struct crypto_attr_alg *alga;

	if (!rta)
		return ERR_PTR(-ENOENT);
	if (RTA_PAYLOAD(rta) < sizeof(*alga))
		return ERR_PTR(-EINVAL);

	alga = RTA_DATA(rta);
	alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;

	return crypto_alg_mod_lookup(alga->name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_get_attr_alg);

struct crypto_instance *crypto_alloc_instance(const char *name,
					      struct crypto_alg *alg)
{
	struct crypto_instance *inst;
	struct crypto_spawn *spawn;
	int err;

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

	err = -ENAMETOOLONG;
	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
		     alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
		goto err_free_inst;

	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
		     name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
		goto err_free_inst;

	spawn = crypto_instance_ctx(inst);
	err = crypto_init_spawn(spawn, alg, inst);

	if (err)
		goto err_free_inst;

	return inst;

err_free_inst:
	kfree(inst);
	return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(crypto_alloc_instance);

void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
{
	INIT_LIST_HEAD(&queue->list);
	queue->backlog = &queue->list;
	queue->qlen = 0;
	queue->max_qlen = max_qlen;
}
EXPORT_SYMBOL_GPL(crypto_init_queue);

int crypto_enqueue_request(struct crypto_queue *queue,
			   struct crypto_async_request *request)
{
	int err = -EINPROGRESS;

	if (unlikely(queue->qlen >= queue->max_qlen)) {
		err = -EBUSY;
		if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
			goto out;
		if (queue->backlog == &queue->list)
			queue->backlog = &request->list;
	}

	queue->qlen++;
	list_add_tail(&request->list, &queue->list);

out:
	return err;
}
EXPORT_SYMBOL_GPL(crypto_enqueue_request);

struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
{
	struct list_head *request;

	if (unlikely(!queue->qlen))
		return NULL;

	queue->qlen--;

	if (queue->backlog != &queue->list)
		queue->backlog = queue->backlog->next;

	request = queue->list.next;
	list_del(request);

	return list_entry(request, struct crypto_async_request, list);
}
EXPORT_SYMBOL_GPL(crypto_dequeue_request);

int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
{
	struct crypto_async_request *req;

	list_for_each_entry(req, &queue->list, list) {
		if (req->tfm == tfm)
			return 1;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);

static int __init crypto_algapi_init(void)
{
	crypto_init_proc();
	return 0;
}

static void __exit crypto_algapi_exit(void)
{
	crypto_exit_proc();
}

module_init(crypto_algapi_init);
module_exit(crypto_algapi_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Cryptographic algorithms API");
Commit	Line	Data
cce9e06d HX	1	/*
	2	* Cryptographic API for algorithms (i.e., low-level API).
	3	*
	4	* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the Free
	8	* Software Foundation; either version 2 of the License, or (at your option)
	9	* any later version.
	10	*
	11	*/
	12
6bfd4809	13	#include <linux/err.h>
cce9e06d HX	14	#include <linux/errno.h>
	15	#include <linux/init.h>
	16	#include <linux/kernel.h>
4cc7720c	17	#include <linux/list.h>
cce9e06d	18	#include <linux/module.h>
7fed0bf2	19	#include <linux/rtnetlink.h>
cce9e06d HX	20	#include <linux/string.h>
	21
	22	#include "internal.h"
	23
4cc7720c HX	24	static LIST_HEAD(crypto_template_list);
4cc7720c HX	25
492e2b63	26	void crypto_larval_error(const char *name, u32 type, u32 mask)
2825982d HX	27	{
	28	struct crypto_alg *alg;
	29
	30	down_read(&crypto_alg_sem);
492e2b63	31	alg = __crypto_alg_lookup(name, type, mask);
2825982d HX	32	up_read(&crypto_alg_sem);
	33
	34	if (alg) {
	35	if (crypto_is_larval(alg)) {
	36	struct crypto_larval larval = (void )alg;
	37	complete(&larval->completion);
	38	}
	39	crypto_mod_put(alg);
	40	}
	41	}
	42	EXPORT_SYMBOL_GPL(crypto_larval_error);
	43
cce9e06d HX	44	static inline int crypto_set_driver_name(struct crypto_alg *alg)
	45	{
	46	static const char suffix[] = "-generic";
	47	char *driver_name = alg->cra_driver_name;
	48	int len;
	49
	50	if (*driver_name)
	51	return 0;
	52
	53	len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
	54	if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
	55	return -ENAMETOOLONG;
	56
	57	memcpy(driver_name + len, suffix, sizeof(suffix));
	58	return 0;
	59	}
	60
4cc7720c	61	static int crypto_check_alg(struct crypto_alg *alg)
cce9e06d	62	{
cce9e06d HX	63	if (alg->cra_alignmask & (alg->cra_alignmask + 1))
	64	return -EINVAL;
	65
	66	if (alg->cra_alignmask & alg->cra_blocksize)
	67	return -EINVAL;
	68
	69	if (alg->cra_blocksize > PAGE_SIZE / 8)
	70	return -EINVAL;
	71
	72	if (alg->cra_priority < 0)
	73	return -EINVAL;
cce9e06d	74
4cc7720c HX	75	return crypto_set_driver_name(alg);
	76	}
	77
6bfd4809 HX	78	static void crypto_destroy_instance(struct crypto_alg *alg)
	79	{
	80	struct crypto_instance inst = (void )alg;
	81	struct crypto_template *tmpl = inst->tmpl;
	82
	83	tmpl->free(inst);
	84	crypto_tmpl_put(tmpl);
	85	}
	86
	87	static void crypto_remove_spawns(struct list_head *spawns,
	88	struct list_head *list)
	89	{
	90	struct crypto_spawn spawn, n;
	91
	92	list_for_each_entry_safe(spawn, n, spawns, list) {
	93	struct crypto_instance *inst = spawn->inst;
	94	struct crypto_template *tmpl = inst->tmpl;
	95
	96	list_del_init(&spawn->list);
	97	spawn->alg = NULL;
	98
	99	if (crypto_is_dead(&inst->alg))
	100	continue;
	101
	102	inst->alg.cra_flags \|= CRYPTO_ALG_DEAD;
	103	if (!tmpl \|\| !crypto_tmpl_get(tmpl))
	104	continue;
	105
	106	crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
	107	list_move(&inst->alg.cra_list, list);
	108	hlist_del(&inst->list);
	109	inst->alg.cra_destroy = crypto_destroy_instance;
	110
	111	if (!list_empty(&inst->alg.cra_users)) {
	112	if (&n->list == spawns)
	113	n = list_entry(inst->alg.cra_users.next,
	114	typeof(*n), list);
	115	__list_splice(&inst->alg.cra_users, spawns->prev);
	116	}
	117	}
	118	}
	119
	120	static int __crypto_register_alg(struct crypto_alg *alg,
	121	struct list_head *list)
4cc7720c HX	122	{
4cc7720c HX	123	struct crypto_alg *q;
6bfd4809 HX	124	int ret = -EAGAIN;
	125
	126	if (crypto_is_dead(alg))
	127	goto out;
	128
	129	INIT_LIST_HEAD(&alg->cra_users);
	130
	131	ret = -EEXIST;
4cc7720c	132
2825982d	133	atomic_set(&alg->cra_refcnt, 1);
cce9e06d	134	list_for_each_entry(q, &crypto_alg_list, cra_list) {
4cc7720c	135	if (q == alg)
cce9e06d	136	goto out;
6bfd4809 HX	137
	138	if (crypto_is_moribund(q))
	139	continue;
	140
	141	if (crypto_is_larval(q)) {
2825982d HX	142	struct crypto_larval larval = (void )q;
2825982d HX	143
6bfd4809 HX	144	if (strcmp(alg->cra_name, q->cra_name) &&
	145	strcmp(alg->cra_driver_name, q->cra_name))
	146	continue;
	147
	148	if (larval->adult)
	149	continue;
492e2b63 HX	150	if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
492e2b63 HX	151	continue;
2825982d HX	152	if (!crypto_mod_get(alg))
2825982d HX	153	continue;
6bfd4809	154
2825982d HX	155	larval->adult = alg;
2825982d HX	156	complete(&larval->completion);
6bfd4809	157	continue;
2825982d	158	}
6bfd4809 HX	159
	160	if (strcmp(alg->cra_name, q->cra_name))
	161	continue;
	162
	163	if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
	164	q->cra_priority > alg->cra_priority)
	165	continue;
	166
	167	crypto_remove_spawns(&q->cra_users, list);
cce9e06d HX	168	}
	169
	170	list_add(&alg->cra_list, &crypto_alg_list);
2825982d HX	171
2825982d HX	172	crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg);
4cc7720c	173	ret = 0;
2825982d	174
cce9e06d	175	out:
cce9e06d HX	176	return ret;
cce9e06d HX	177	}
4cc7720c	178
6bfd4809 HX	179	static void crypto_remove_final(struct list_head *list)
	180	{
	181	struct crypto_alg *alg;
	182	struct crypto_alg *n;
	183
	184	list_for_each_entry_safe(alg, n, list, cra_list) {
	185	list_del_init(&alg->cra_list);
	186	crypto_alg_put(alg);
	187	}
	188	}
	189
4cc7720c HX	190	int crypto_register_alg(struct crypto_alg *alg)
4cc7720c HX	191	{
6bfd4809	192	LIST_HEAD(list);
4cc7720c HX	193	int err;
	194
	195	err = crypto_check_alg(alg);
	196	if (err)
	197	return err;
	198
	199	down_write(&crypto_alg_sem);
6bfd4809	200	err = __crypto_register_alg(alg, &list);
4cc7720c HX	201	up_write(&crypto_alg_sem);
4cc7720c HX	202
6bfd4809	203	crypto_remove_final(&list);
4cc7720c HX	204	return err;
4cc7720c HX	205	}
cce9e06d HX	206	EXPORT_SYMBOL_GPL(crypto_register_alg);
cce9e06d HX	207
6bfd4809 HX	208	static int crypto_remove_alg(struct crypto_alg alg, struct list_head list)
	209	{
	210	if (unlikely(list_empty(&alg->cra_list)))
	211	return -ENOENT;
	212
	213	alg->cra_flags \|= CRYPTO_ALG_DEAD;
	214
	215	crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
	216	list_del_init(&alg->cra_list);
	217	crypto_remove_spawns(&alg->cra_users, list);
	218
	219	return 0;
	220	}
	221
cce9e06d HX	222	int crypto_unregister_alg(struct crypto_alg *alg)
cce9e06d HX	223	{
6bfd4809 HX	224	int ret;
6bfd4809 HX	225	LIST_HEAD(list);
cce9e06d HX	226
cce9e06d HX	227	down_write(&crypto_alg_sem);
6bfd4809	228	ret = crypto_remove_alg(alg, &list);
cce9e06d HX	229	up_write(&crypto_alg_sem);
	230
	231	if (ret)
	232	return ret;
	233
	234	BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
	235	if (alg->cra_destroy)
	236	alg->cra_destroy(alg);
	237
6bfd4809	238	crypto_remove_final(&list);
cce9e06d HX	239	return 0;
	240	}
	241	EXPORT_SYMBOL_GPL(crypto_unregister_alg);
	242
4cc7720c HX	243	int crypto_register_template(struct crypto_template *tmpl)
	244	{
	245	struct crypto_template *q;
	246	int err = -EEXIST;
	247
	248	down_write(&crypto_alg_sem);
	249
	250	list_for_each_entry(q, &crypto_template_list, list) {
	251	if (q == tmpl)
	252	goto out;
	253	}
	254
	255	list_add(&tmpl->list, &crypto_template_list);
2825982d	256	crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
4cc7720c HX	257	err = 0;
	258	out:
	259	up_write(&crypto_alg_sem);
	260	return err;
	261	}
	262	EXPORT_SYMBOL_GPL(crypto_register_template);
	263
	264	void crypto_unregister_template(struct crypto_template *tmpl)
	265	{
	266	struct crypto_instance *inst;
	267	struct hlist_node p, n;
	268	struct hlist_head *list;
6bfd4809	269	LIST_HEAD(users);
4cc7720c HX	270
	271	down_write(&crypto_alg_sem);
	272
	273	BUG_ON(list_empty(&tmpl->list));
	274	list_del_init(&tmpl->list);
	275
	276	list = &tmpl->instances;
	277	hlist_for_each_entry(inst, p, list, list) {
6bfd4809 HX	278	int err = crypto_remove_alg(&inst->alg, &users);
6bfd4809 HX	279	BUG_ON(err);
4cc7720c HX	280	}
4cc7720c HX	281
2825982d HX	282	crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
2825982d HX	283
4cc7720c HX	284	up_write(&crypto_alg_sem);
	285
	286	hlist_for_each_entry_safe(inst, p, n, list, list) {
	287	BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
	288	tmpl->free(inst);
	289	}
6bfd4809	290	crypto_remove_final(&users);
4cc7720c HX	291	}
	292	EXPORT_SYMBOL_GPL(crypto_unregister_template);
	293
	294	static struct crypto_template __crypto_lookup_template(const char name)
	295	{
	296	struct crypto_template q, tmpl = NULL;
	297
	298	down_read(&crypto_alg_sem);
	299	list_for_each_entry(q, &crypto_template_list, list) {
	300	if (strcmp(q->name, name))
	301	continue;
	302	if (unlikely(!crypto_tmpl_get(q)))
	303	continue;
	304
	305	tmpl = q;
	306	break;
	307	}
	308	up_read(&crypto_alg_sem);
	309
	310	return tmpl;
	311	}
	312
	313	struct crypto_template crypto_lookup_template(const char name)
	314	{
	315	return try_then_request_module(__crypto_lookup_template(name), name);
	316	}
	317	EXPORT_SYMBOL_GPL(crypto_lookup_template);
	318
	319	int crypto_register_instance(struct crypto_template *tmpl,
	320	struct crypto_instance *inst)
	321	{
6bfd4809	322	LIST_HEAD(list);
4cc7720c HX	323	int err = -EINVAL;
	324
	325	if (inst->alg.cra_destroy)
	326	goto err;
	327
	328	err = crypto_check_alg(&inst->alg);
	329	if (err)
	330	goto err;
	331
	332	inst->alg.cra_module = tmpl->module;
	333
	334	down_write(&crypto_alg_sem);
	335
6bfd4809	336	err = __crypto_register_alg(&inst->alg, &list);
4cc7720c HX	337	if (err)
	338	goto unlock;
	339
	340	hlist_add_head(&inst->list, &tmpl->instances);
	341	inst->tmpl = tmpl;
	342
	343	unlock:
	344	up_write(&crypto_alg_sem);
	345
6bfd4809 HX	346	crypto_remove_final(&list);
6bfd4809 HX	347
4cc7720c HX	348	err:
	349	return err;
	350	}
	351	EXPORT_SYMBOL_GPL(crypto_register_instance);
	352
6bfd4809 HX	353	int crypto_init_spawn(struct crypto_spawn spawn, struct crypto_alg alg,
	354	struct crypto_instance *inst)
	355	{
	356	int err = -EAGAIN;
	357
	358	spawn->inst = inst;
	359
	360	down_write(&crypto_alg_sem);
	361	if (!crypto_is_moribund(alg)) {
	362	list_add(&spawn->list, &alg->cra_users);
	363	spawn->alg = alg;
	364	err = 0;
	365	}
	366	up_write(&crypto_alg_sem);
	367
	368	return err;
	369	}
	370	EXPORT_SYMBOL_GPL(crypto_init_spawn);
	371
	372	void crypto_drop_spawn(struct crypto_spawn *spawn)
	373	{
	374	down_write(&crypto_alg_sem);
	375	list_del(&spawn->list);
	376	up_write(&crypto_alg_sem);
	377	}
	378	EXPORT_SYMBOL_GPL(crypto_drop_spawn);
	379
2e306ee0 HX	380	struct crypto_tfm crypto_spawn_tfm(struct crypto_spawn spawn, u32 type,
2e306ee0 HX	381	u32 mask)
6bfd4809 HX	382	{
	383	struct crypto_alg *alg;
	384	struct crypto_alg *alg2;
	385	struct crypto_tfm *tfm;
	386
	387	down_read(&crypto_alg_sem);
	388	alg = spawn->alg;
	389	alg2 = alg;
	390	if (alg2)
	391	alg2 = crypto_mod_get(alg2);
	392	up_read(&crypto_alg_sem);
	393
	394	if (!alg2) {
	395	if (alg)
	396	crypto_shoot_alg(alg);
	397	return ERR_PTR(-EAGAIN);
	398	}
	399
2e306ee0 HX	400	tfm = ERR_PTR(-EINVAL);
	401	if (unlikely((alg->cra_flags ^ type) & mask))
	402	goto out_put_alg;
	403
27d2a330	404	tfm = __crypto_alloc_tfm(alg, type, mask);
6bfd4809	405	if (IS_ERR(tfm))
2e306ee0 HX	406	goto out_put_alg;
	407
	408	return tfm;
6bfd4809	409
2e306ee0 HX	410	out_put_alg:
2e306ee0 HX	411	crypto_mod_put(alg);
6bfd4809 HX	412	return tfm;
	413	}
	414	EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
	415
2825982d HX	416	int crypto_register_notifier(struct notifier_block *nb)
	417	{
	418	return blocking_notifier_chain_register(&crypto_chain, nb);
	419	}
	420	EXPORT_SYMBOL_GPL(crypto_register_notifier);
	421
	422	int crypto_unregister_notifier(struct notifier_block *nb)
	423	{
	424	return blocking_notifier_chain_unregister(&crypto_chain, nb);
	425	}
	426	EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
	427
ebc610e5	428	struct crypto_attr_type crypto_get_attr_type(struct rtattr *tb)
7fed0bf2	429	{
ebc610e5 HX	430	struct rtattr *rta = tb[CRYPTOA_TYPE - 1];
	431	struct crypto_attr_type *algt;
	432
	433	if (!rta)
	434	return ERR_PTR(-ENOENT);
	435	if (RTA_PAYLOAD(rta) < sizeof(*algt))
	436	return ERR_PTR(-EINVAL);
	437
	438	algt = RTA_DATA(rta);
	439
	440	return algt;
	441	}
	442	EXPORT_SYMBOL_GPL(crypto_get_attr_type);
	443
	444	int crypto_check_attr_type(struct rtattr **tb, u32 type)
	445	{
	446	struct crypto_attr_type *algt;
	447
	448	algt = crypto_get_attr_type(tb);
	449	if (IS_ERR(algt))
	450	return PTR_ERR(algt);
	451
	452	if ((algt->type ^ type) & algt->mask)
	453	return -EINVAL;
	454
	455	return 0;
	456	}
	457	EXPORT_SYMBOL_GPL(crypto_check_attr_type);
	458
	459	struct crypto_alg crypto_get_attr_alg(struct rtattr *tb, u32 type, u32 mask)
	460	{
	461	struct rtattr *rta = tb[CRYPTOA_ALG - 1];
7fed0bf2 HX	462	struct crypto_attr_alg *alga;
7fed0bf2 HX	463
ebc610e5 HX	464	if (!rta)
	465	return ERR_PTR(-ENOENT);
	466	if (RTA_PAYLOAD(rta) < sizeof(*alga))
7fed0bf2 HX	467	return ERR_PTR(-EINVAL);
	468
	469	alga = RTA_DATA(rta);
	470	alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
	471
	472	return crypto_alg_mod_lookup(alga->name, type, mask);
	473	}
	474	EXPORT_SYMBOL_GPL(crypto_get_attr_alg);
	475
	476	struct crypto_instance crypto_alloc_instance(const char name,
	477	struct crypto_alg *alg)
	478	{
	479	struct crypto_instance *inst;
	480	struct crypto_spawn *spawn;
	481	int err;
	482
	483	inst = kzalloc(sizeof(inst) + sizeof(spawn), GFP_KERNEL);
	484	if (!inst)
	485	return ERR_PTR(-ENOMEM);
	486
	487	err = -ENAMETOOLONG;
	488	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
	489	alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
	490	goto err_free_inst;
	491
	492	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
	493	name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
	494	goto err_free_inst;
	495
	496	spawn = crypto_instance_ctx(inst);
	497	err = crypto_init_spawn(spawn, alg, inst);
	498
	499	if (err)
	500	goto err_free_inst;
	501
	502	return inst;
	503
	504	err_free_inst:
	505	kfree(inst);
	506	return ERR_PTR(err);
	507	}
	508	EXPORT_SYMBOL_GPL(crypto_alloc_instance);
	509
b5b7f088 HX	510	void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
	511	{
	512	INIT_LIST_HEAD(&queue->list);
	513	queue->backlog = &queue->list;
	514	queue->qlen = 0;
	515	queue->max_qlen = max_qlen;
	516	}
	517	EXPORT_SYMBOL_GPL(crypto_init_queue);
	518
	519	int crypto_enqueue_request(struct crypto_queue *queue,
	520	struct crypto_async_request *request)
	521	{
	522	int err = -EINPROGRESS;
	523
	524	if (unlikely(queue->qlen >= queue->max_qlen)) {
	525	err = -EBUSY;
	526	if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
	527	goto out;
	528	if (queue->backlog == &queue->list)
	529	queue->backlog = &request->list;
	530	}
	531
	532	queue->qlen++;
	533	list_add_tail(&request->list, &queue->list);
	534
	535	out:
	536	return err;
	537	}
	538	EXPORT_SYMBOL_GPL(crypto_enqueue_request);
	539
	540	struct crypto_async_request crypto_dequeue_request(struct crypto_queue queue)
	541	{
	542	struct list_head *request;
	543
	544	if (unlikely(!queue->qlen))
	545	return NULL;
	546
	547	queue->qlen--;
	548
	549	if (queue->backlog != &queue->list)
	550	queue->backlog = queue->backlog->next;
	551
	552	request = queue->list.next;
	553	list_del(request);
	554
	555	return list_entry(request, struct crypto_async_request, list);
	556	}
	557	EXPORT_SYMBOL_GPL(crypto_dequeue_request);
	558
	559	int crypto_tfm_in_queue(struct crypto_queue queue, struct crypto_tfm tfm)
	560	{
	561	struct crypto_async_request *req;
	562
	563	list_for_each_entry(req, &queue->list, list) {
	564	if (req->tfm == tfm)
	565	return 1;
	566	}
	567
	568	return 0;
	569	}
	570	EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
	571
cce9e06d HX	572	static int __init crypto_algapi_init(void)
	573	{
	574	crypto_init_proc();
	575	return 0;
	576	}
	577
	578	static void __exit crypto_algapi_exit(void)
	579	{
	580	crypto_exit_proc();
	581	}
	582
	583	module_init(crypto_algapi_init);
	584	module_exit(crypto_algapi_exit);
	585
	586	MODULE_LICENSE("GPL");
	587	MODULE_DESCRIPTION("Cryptographic algorithms API");