[mirror_ubuntu-bionic-kernel.git] / crypto / api.c

/*
 * Scatterlist Cryptographic API.
 *
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
 * and Nettle, by Niels Möller.
 *
 * 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/kernel.h>
#include <linux/kmod.h>
#include <linux/module.h>
#include <linux/param.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "internal.h"

LIST_HEAD(crypto_alg_list);
EXPORT_SYMBOL_GPL(crypto_alg_list);
DECLARE_RWSEM(crypto_alg_sem);
EXPORT_SYMBOL_GPL(crypto_alg_sem);

BLOCKING_NOTIFIER_HEAD(crypto_chain);
EXPORT_SYMBOL_GPL(crypto_chain);

static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg);

struct crypto_alg *crypto_mod_get(struct crypto_alg *alg)
{
	return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
}
EXPORT_SYMBOL_GPL(crypto_mod_get);

void crypto_mod_put(struct crypto_alg *alg)
{
	struct module *module = alg->cra_module;

	crypto_alg_put(alg);
	module_put(module);
}
EXPORT_SYMBOL_GPL(crypto_mod_put);

static inline int crypto_is_test_larval(struct crypto_larval *larval)
{
	return larval->alg.cra_driver_name[0];
}

static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type,
					      u32 mask)
{
	struct crypto_alg *q, *alg = NULL;
	int best = -2;

	list_for_each_entry(q, &crypto_alg_list, cra_list) {
		int exact, fuzzy;

		if (crypto_is_moribund(q))
			continue;

		if ((q->cra_flags ^ type) & mask)
			continue;

		if (crypto_is_larval(q) &&
		    !crypto_is_test_larval((struct crypto_larval *)q) &&
		    ((struct crypto_larval *)q)->mask != mask)
			continue;

		exact = !strcmp(q->cra_driver_name, name);
		fuzzy = !strcmp(q->cra_name, name);
		if (!exact && !(fuzzy && q->cra_priority > best))
			continue;

		if (unlikely(!crypto_mod_get(q)))
			continue;

		best = q->cra_priority;
		if (alg)
			crypto_mod_put(alg);
		alg = q;

		if (exact)
			break;
	}

	return alg;
}

static void crypto_larval_destroy(struct crypto_alg *alg)
{
	struct crypto_larval *larval = (void *)alg;

	BUG_ON(!crypto_is_larval(alg));
	if (larval->adult)
		crypto_mod_put(larval->adult);
	kfree(larval);
}

struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask)
{
	struct crypto_larval *larval;

	larval = kzalloc(sizeof(*larval), GFP_KERNEL);
	if (!larval)
		return ERR_PTR(-ENOMEM);

	larval->mask = mask;
	larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type;
	larval->alg.cra_priority = -1;
	larval->alg.cra_destroy = crypto_larval_destroy;

	strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
	init_completion(&larval->completion);

	return larval;
}
EXPORT_SYMBOL_GPL(crypto_larval_alloc);

static struct crypto_alg *crypto_larval_add(const char *name, u32 type,
					    u32 mask)
{
	struct crypto_alg *alg;
	struct crypto_larval *larval;

	larval = crypto_larval_alloc(name, type, mask);
	if (IS_ERR(larval))
		return ERR_CAST(larval);

	atomic_set(&larval->alg.cra_refcnt, 2);

	down_write(&crypto_alg_sem);
	alg = __crypto_alg_lookup(name, type, mask);
	if (!alg) {
		alg = &larval->alg;
		list_add(&alg->cra_list, &crypto_alg_list);
	}
	up_write(&crypto_alg_sem);

	if (alg != &larval->alg) {
		kfree(larval);
		if (crypto_is_larval(alg))
			alg = crypto_larval_wait(alg);
	}

	return alg;
}

void crypto_larval_kill(struct crypto_alg *alg)
{
	struct crypto_larval *larval = (void *)alg;

	down_write(&crypto_alg_sem);
	list_del(&alg->cra_list);
	up_write(&crypto_alg_sem);
	complete_all(&larval->completion);
	crypto_alg_put(alg);
}
EXPORT_SYMBOL_GPL(crypto_larval_kill);

static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
{
	struct crypto_larval *larval = (void *)alg;
	long timeout;

	timeout = wait_for_completion_interruptible_timeout(
		&larval->completion, 60 * HZ);

	alg = larval->adult;
	if (timeout < 0)
		alg = ERR_PTR(-EINTR);
	else if (!timeout)
		alg = ERR_PTR(-ETIMEDOUT);
	else if (!alg)
		alg = ERR_PTR(-ENOENT);
	else if (crypto_is_test_larval(larval) &&
		 !(alg->cra_flags & CRYPTO_ALG_TESTED))
		alg = ERR_PTR(-EAGAIN);
	else if (!crypto_mod_get(alg))
		alg = ERR_PTR(-EAGAIN);
	crypto_mod_put(&larval->alg);

	return alg;
}

struct crypto_alg *crypto_alg_lookup(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);

	return alg;
}
EXPORT_SYMBOL_GPL(crypto_alg_lookup);

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

	if (!name)
		return ERR_PTR(-ENOENT);

	mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
	type &= mask;

	alg = crypto_alg_lookup(name, type, mask);
	if (!alg) {
		request_module("%s", name);

		if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
		      CRYPTO_ALG_NEED_FALLBACK))
			request_module("%s-all", name);

		alg = crypto_alg_lookup(name, type, mask);
	}

	if (alg)
		return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;

	return crypto_larval_add(name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_larval_lookup);

int crypto_probing_notify(unsigned long val, void *v)
{
	int ok;

	ok = blocking_notifier_call_chain(&crypto_chain, val, v);
	if (ok == NOTIFY_DONE) {
		request_module("cryptomgr");
		ok = blocking_notifier_call_chain(&crypto_chain, val, v);
	}

	return ok;
}
EXPORT_SYMBOL_GPL(crypto_probing_notify);

struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
{
	struct crypto_alg *alg;
	struct crypto_alg *larval;
	int ok;

	if (!((type | mask) & CRYPTO_ALG_TESTED)) {
		type |= CRYPTO_ALG_TESTED;
		mask |= CRYPTO_ALG_TESTED;
	}

	larval = crypto_larval_lookup(name, type, mask);
	if (IS_ERR(larval) || !crypto_is_larval(larval))
		return larval;

	ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);

	if (ok == NOTIFY_STOP)
		alg = crypto_larval_wait(larval);
	else {
		crypto_mod_put(larval);
		alg = ERR_PTR(-ENOENT);
	}
	crypto_larval_kill(larval);
	return alg;
}
EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);

static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
	const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;

	if (type_obj)
		return type_obj->init(tfm, type, mask);

	switch (crypto_tfm_alg_type(tfm)) {
	case CRYPTO_ALG_TYPE_CIPHER:
		return crypto_init_cipher_ops(tfm);

	case CRYPTO_ALG_TYPE_COMPRESS:
		return crypto_init_compress_ops(tfm);

	default:
		break;
	}

	BUG();
	return -EINVAL;
}

static void crypto_exit_ops(struct crypto_tfm *tfm)
{
	const struct crypto_type *type = tfm->__crt_alg->cra_type;

	if (type) {
		if (tfm->exit)
			tfm->exit(tfm);
		return;
	}

	switch (crypto_tfm_alg_type(tfm)) {
	case CRYPTO_ALG_TYPE_CIPHER:
		crypto_exit_cipher_ops(tfm);
		break;

	case CRYPTO_ALG_TYPE_COMPRESS:
		crypto_exit_compress_ops(tfm);
		break;

	default:
		BUG();
	}
}

static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
{
	const struct crypto_type *type_obj = alg->cra_type;
	unsigned int len;

	len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
	if (type_obj)
		return len + type_obj->ctxsize(alg, type, mask);

	switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
	default:
		BUG();

	case CRYPTO_ALG_TYPE_CIPHER:
		len += crypto_cipher_ctxsize(alg);
		break;

	case CRYPTO_ALG_TYPE_COMPRESS:
		len += crypto_compress_ctxsize(alg);
		break;
	}

	return len;
}

void crypto_shoot_alg(struct crypto_alg *alg)
{
	down_write(&crypto_alg_sem);
	alg->cra_flags |= CRYPTO_ALG_DYING;
	up_write(&crypto_alg_sem);
}
EXPORT_SYMBOL_GPL(crypto_shoot_alg);

struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
				      u32 mask)
{
	struct crypto_tfm *tfm = NULL;
	unsigned int tfm_size;
	int err = -ENOMEM;

	tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
	tfm = kzalloc(tfm_size, GFP_KERNEL);
	if (tfm == NULL)
		goto out_err;

	tfm->__crt_alg = alg;

	err = crypto_init_ops(tfm, type, mask);
	if (err)
		goto out_free_tfm;

	if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
		goto cra_init_failed;

	goto out;

cra_init_failed:
	crypto_exit_ops(tfm);
out_free_tfm:
	if (err == -EAGAIN)
		crypto_shoot_alg(alg);
	kfree(tfm);
out_err:
	tfm = ERR_PTR(err);
out:
	return tfm;
}
EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);

/*
 *	crypto_alloc_base - Locate algorithm and allocate transform
 *	@alg_name: Name of algorithm
 *	@type: Type of algorithm
 *	@mask: Mask for type comparison
 *
 *	This function should not be used by new algorithm types.
 *	Please use crypto_alloc_tfm instead.
 *
 *	crypto_alloc_base() will first attempt to locate an already loaded
 *	algorithm.  If that fails and the kernel supports dynamically loadable
 *	modules, it will then attempt to load a module of the same name or
 *	alias.  If that fails it will send a query to any loaded crypto manager
 *	to construct an algorithm on the fly.  A refcount is grabbed on the
 *	algorithm which is then associated with the new transform.
 *
 *	The returned transform is of a non-determinate type.  Most people
 *	should use one of the more specific allocation functions such as
 *	crypto_alloc_blkcipher.
 *
 *	In case of error the return value is an error pointer.
 */
struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
{
	struct crypto_tfm *tfm;
	int err;

	for (;;) {
		struct crypto_alg *alg;

		alg = crypto_alg_mod_lookup(alg_name, type, mask);
		if (IS_ERR(alg)) {
			err = PTR_ERR(alg);
			goto err;
		}

		tfm = __crypto_alloc_tfm(alg, type, mask);
		if (!IS_ERR(tfm))
			return tfm;

		crypto_mod_put(alg);
		err = PTR_ERR(tfm);

err:
		if (err != -EAGAIN)
			break;
		if (signal_pending(current)) {
			err = -EINTR;
			break;
		}
	}

	return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(crypto_alloc_base);

void *crypto_create_tfm(struct crypto_alg *alg,
			const struct crypto_type *frontend)
{
	char *mem;
	struct crypto_tfm *tfm = NULL;
	unsigned int tfmsize;
	unsigned int total;
	int err = -ENOMEM;

	tfmsize = frontend->tfmsize;
	total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);

	mem = kzalloc(total, GFP_KERNEL);
	if (mem == NULL)
		goto out_err;

	tfm = (struct crypto_tfm *)(mem + tfmsize);
	tfm->__crt_alg = alg;

	err = frontend->init_tfm(tfm);
	if (err)
		goto out_free_tfm;

	if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
		goto cra_init_failed;

	goto out;

cra_init_failed:
	crypto_exit_ops(tfm);
out_free_tfm:
	if (err == -EAGAIN)
		crypto_shoot_alg(alg);
	kfree(mem);
out_err:
	mem = ERR_PTR(err);
out:
	return mem;
}
EXPORT_SYMBOL_GPL(crypto_create_tfm);

struct crypto_alg *crypto_find_alg(const char *alg_name,
				   const struct crypto_type *frontend,
				   u32 type, u32 mask)
{
	struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask) =
		crypto_alg_mod_lookup;

	if (frontend) {
		type &= frontend->maskclear;
		mask &= frontend->maskclear;
		type |= frontend->type;
		mask |= frontend->maskset;

		if (frontend->lookup)
			lookup = frontend->lookup;
	}

	return lookup(alg_name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_find_alg);

/*
 *	crypto_alloc_tfm - Locate algorithm and allocate transform
 *	@alg_name: Name of algorithm
 *	@frontend: Frontend algorithm type
 *	@type: Type of algorithm
 *	@mask: Mask for type comparison
 *
 *	crypto_alloc_tfm() will first attempt to locate an already loaded
 *	algorithm.  If that fails and the kernel supports dynamically loadable
 *	modules, it will then attempt to load a module of the same name or
 *	alias.  If that fails it will send a query to any loaded crypto manager
 *	to construct an algorithm on the fly.  A refcount is grabbed on the
 *	algorithm which is then associated with the new transform.
 *
 *	The returned transform is of a non-determinate type.  Most people
 *	should use one of the more specific allocation functions such as
 *	crypto_alloc_blkcipher.
 *
 *	In case of error the return value is an error pointer.
 */
void *crypto_alloc_tfm(const char *alg_name,
		       const struct crypto_type *frontend, u32 type, u32 mask)
{
	void *tfm;
	int err;

	for (;;) {
		struct crypto_alg *alg;

		alg = crypto_find_alg(alg_name, frontend, type, mask);
		if (IS_ERR(alg)) {
			err = PTR_ERR(alg);
			goto err;
		}

		tfm = crypto_create_tfm(alg, frontend);
		if (!IS_ERR(tfm))
			return tfm;

		crypto_mod_put(alg);
		err = PTR_ERR(tfm);

err:
		if (err != -EAGAIN)
			break;
		if (signal_pending(current)) {
			err = -EINTR;
			break;
		}
	}

	return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(crypto_alloc_tfm);

/*
 *	crypto_destroy_tfm - Free crypto transform
 *	@mem: Start of tfm slab
 *	@tfm: Transform to free
 *
 *	This function frees up the transform and any associated resources,
 *	then drops the refcount on the associated algorithm.
 */
void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
{
	struct crypto_alg *alg;

	if (unlikely(!mem))
		return;

	alg = tfm->__crt_alg;

	if (!tfm->exit && alg->cra_exit)
		alg->cra_exit(tfm);
	crypto_exit_ops(tfm);
	crypto_mod_put(alg);
	kzfree(mem);
}
EXPORT_SYMBOL_GPL(crypto_destroy_tfm);

int crypto_has_alg(const char *name, u32 type, u32 mask)
{
	int ret = 0;
	struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);

	if (!IS_ERR(alg)) {
		crypto_mod_put(alg);
		ret = 1;
	}

	return ret;
}
EXPORT_SYMBOL_GPL(crypto_has_alg);

MODULE_DESCRIPTION("Cryptographic core API");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Scatterlist Cryptographic API.
	3	*
	4	* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
	5	* Copyright (c) 2002 David S. Miller (davem@redhat.com)
5cb1454b	6	* Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
1da177e4 LT	7	*
1da177e4 LT	8	* Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
991d1740	9	* and Nettle, by Niels Möller.
1da177e4 LT	10	*
	11	* This program is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the Free
3d01a33b	13	* Software Foundation; either version 2 of the License, or (at your option)
1da177e4 LT	14	* any later version.
	15	*
	16	*/
a61cc448	17
6bfd4809	18	#include <linux/err.h>
1da177e4	19	#include <linux/errno.h>
5cb1454b	20	#include <linux/kernel.h>
176c3652	21	#include <linux/kmod.h>
2b8c19db	22	#include <linux/module.h>
2825982d	23	#include <linux/param.h>
6bfd4809	24	#include <linux/sched.h>
1da177e4	25	#include <linux/slab.h>
5cb1454b	26	#include <linux/string.h>
1da177e4 LT	27	#include "internal.h"
	28
	29	LIST_HEAD(crypto_alg_list);
cce9e06d	30	EXPORT_SYMBOL_GPL(crypto_alg_list);
1da177e4	31	DECLARE_RWSEM(crypto_alg_sem);
cce9e06d	32	EXPORT_SYMBOL_GPL(crypto_alg_sem);
1da177e4	33
2825982d HX	34	BLOCKING_NOTIFIER_HEAD(crypto_chain);
	35	EXPORT_SYMBOL_GPL(crypto_chain);
	36
77dbd7a9 HX	37	static struct crypto_alg crypto_larval_wait(struct crypto_alg alg);
77dbd7a9 HX	38
2825982d	39	struct crypto_alg crypto_mod_get(struct crypto_alg alg)
6521f302 HX	40	{
6521f302 HX	41	return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
1da177e4	42	}
2825982d	43	EXPORT_SYMBOL_GPL(crypto_mod_get);
1da177e4	44
2825982d	45	void crypto_mod_put(struct crypto_alg *alg)
1da177e4	46	{
da7cd59a HX	47	struct module *module = alg->cra_module;
da7cd59a HX	48
6521f302	49	crypto_alg_put(alg);
da7cd59a	50	module_put(module);
1da177e4	51	}
2825982d	52	EXPORT_SYMBOL_GPL(crypto_mod_put);
1da177e4	53
73d3864a HX	54	static inline int crypto_is_test_larval(struct crypto_larval *larval)
	55	{
	56	return larval->alg.cra_driver_name[0];
	57	}
	58
c51b6c81 HX	59	static struct crypto_alg __crypto_alg_lookup(const char name, u32 type,
c51b6c81 HX	60	u32 mask)
1da177e4 LT	61	{
1da177e4 LT	62	struct crypto_alg q, alg = NULL;
2825982d	63	int best = -2;
1da177e4	64
1da177e4	65	list_for_each_entry(q, &crypto_alg_list, cra_list) {
5cb1454b HX	66	int exact, fuzzy;
5cb1454b HX	67
6bfd4809 HX	68	if (crypto_is_moribund(q))
	69	continue;
	70
492e2b63 HX	71	if ((q->cra_flags ^ type) & mask)
	72	continue;
	73
	74	if (crypto_is_larval(q) &&
73d3864a	75	!crypto_is_test_larval((struct crypto_larval *)q) &&
492e2b63 HX	76	((struct crypto_larval *)q)->mask != mask)
	77	continue;
	78
5cb1454b HX	79	exact = !strcmp(q->cra_driver_name, name);
	80	fuzzy = !strcmp(q->cra_name, name);
	81	if (!exact && !(fuzzy && q->cra_priority > best))
	82	continue;
	83
72fa4919	84	if (unlikely(!crypto_mod_get(q)))
5cb1454b HX	85	continue;
	86
	87	best = q->cra_priority;
	88	if (alg)
72fa4919	89	crypto_mod_put(alg);
5cb1454b HX	90	alg = q;
	91
	92	if (exact)
1da177e4	93	break;
1da177e4	94	}
2825982d HX	95
	96	return alg;
	97	}
2825982d HX	98
	99	static void crypto_larval_destroy(struct crypto_alg *alg)
	100	{
	101	struct crypto_larval larval = (void )alg;
	102
	103	BUG_ON(!crypto_is_larval(alg));
	104	if (larval->adult)
	105	crypto_mod_put(larval->adult);
	106	kfree(larval);
	107	}
	108
73d3864a	109	struct crypto_larval crypto_larval_alloc(const char name, u32 type, u32 mask)
2825982d	110	{
2825982d HX	111	struct crypto_larval *larval;
	112
	113	larval = kzalloc(sizeof(*larval), GFP_KERNEL);
	114	if (!larval)
6bfd4809	115	return ERR_PTR(-ENOMEM);
2825982d	116
492e2b63 HX	117	larval->mask = mask;
492e2b63 HX	118	larval->alg.cra_flags = CRYPTO_ALG_LARVAL \| type;
2825982d HX	119	larval->alg.cra_priority = -1;
	120	larval->alg.cra_destroy = crypto_larval_destroy;
	121
2825982d HX	122	strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
	123	init_completion(&larval->completion);
	124
73d3864a HX	125	return larval;
	126	}
	127	EXPORT_SYMBOL_GPL(crypto_larval_alloc);
	128
	129	static struct crypto_alg crypto_larval_add(const char name, u32 type,
	130	u32 mask)
	131	{
	132	struct crypto_alg *alg;
	133	struct crypto_larval *larval;
	134
	135	larval = crypto_larval_alloc(name, type, mask);
	136	if (IS_ERR(larval))
	137	return ERR_CAST(larval);
	138
	139	atomic_set(&larval->alg.cra_refcnt, 2);
	140
2825982d	141	down_write(&crypto_alg_sem);
492e2b63	142	alg = __crypto_alg_lookup(name, type, mask);
2825982d HX	143	if (!alg) {
	144	alg = &larval->alg;
	145	list_add(&alg->cra_list, &crypto_alg_list);
	146	}
	147	up_write(&crypto_alg_sem);
	148
77dbd7a9	149	if (alg != &larval->alg) {
2825982d	150	kfree(larval);
77dbd7a9 HX	151	if (crypto_is_larval(alg))
	152	alg = crypto_larval_wait(alg);
	153	}
2825982d HX	154
	155	return alg;
	156	}
	157
b9c55aa4	158	void crypto_larval_kill(struct crypto_alg *alg)
2825982d HX	159	{
	160	struct crypto_larval larval = (void )alg;
	161
	162	down_write(&crypto_alg_sem);
	163	list_del(&alg->cra_list);
	164	up_write(&crypto_alg_sem);
fe3c5206	165	complete_all(&larval->completion);
2825982d HX	166	crypto_alg_put(alg);
2825982d HX	167	}
b9c55aa4	168	EXPORT_SYMBOL_GPL(crypto_larval_kill);
2825982d HX	169
	170	static struct crypto_alg crypto_larval_wait(struct crypto_alg alg)
	171	{
	172	struct crypto_larval larval = (void )alg;
73d3864a HX	173	long timeout;
	174
	175	timeout = wait_for_completion_interruptible_timeout(
	176	&larval->completion, 60 * HZ);
2825982d	177
2825982d	178	alg = larval->adult;
73d3864a HX	179	if (timeout < 0)
	180	alg = ERR_PTR(-EINTR);
	181	else if (!timeout)
	182	alg = ERR_PTR(-ETIMEDOUT);
	183	else if (!alg)
6bfd4809	184	alg = ERR_PTR(-ENOENT);
73d3864a HX	185	else if (crypto_is_test_larval(larval) &&
	186	!(alg->cra_flags & CRYPTO_ALG_TESTED))
	187	alg = ERR_PTR(-EAGAIN);
	188	else if (!crypto_mod_get(alg))
	189	alg = ERR_PTR(-EAGAIN);
2825982d HX	190	crypto_mod_put(&larval->alg);
	191
	192	return alg;
	193	}
	194
c51b6c81	195	struct crypto_alg crypto_alg_lookup(const char name, u32 type, u32 mask)
2825982d HX	196	{
	197	struct crypto_alg *alg;
	198
2825982d	199	down_read(&crypto_alg_sem);
492e2b63	200	alg = __crypto_alg_lookup(name, type, mask);
1da177e4	201	up_read(&crypto_alg_sem);
2825982d	202
1da177e4 LT	203	return alg;
1da177e4 LT	204	}
c51b6c81	205	EXPORT_SYMBOL_GPL(crypto_alg_lookup);
1da177e4	206
b9c55aa4	207	struct crypto_alg crypto_larval_lookup(const char name, u32 type, u32 mask)
176c3652	208	{
2825982d	209	struct crypto_alg *alg;
2825982d	210
6bfd4809 HX	211	if (!name)
	212	return ERR_PTR(-ENOENT);
	213
	214	mask &= ~(CRYPTO_ALG_LARVAL \| CRYPTO_ALG_DEAD);
492e2b63 HX	215	type &= mask;
492e2b63 HX	216
a760a665 HX	217	alg = crypto_alg_lookup(name, type, mask);
a760a665 HX	218	if (!alg) {
aa07a699	219	request_module("%s", name);
a760a665	220
37fc334c	221	if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
aa07a699 AR	222	CRYPTO_ALG_NEED_FALLBACK))
aa07a699 AR	223	request_module("%s-all", name);
a760a665 HX	224
	225	alg = crypto_alg_lookup(name, type, mask);
	226	}
	227
2825982d HX	228	if (alg)
	229	return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;
	230
73d3864a	231	return crypto_larval_add(name, type, mask);
b9c55aa4 HX	232	}
	233	EXPORT_SYMBOL_GPL(crypto_larval_lookup);
	234
73d3864a HX	235	int crypto_probing_notify(unsigned long val, void *v)
	236	{
	237	int ok;
	238
	239	ok = blocking_notifier_call_chain(&crypto_chain, val, v);
	240	if (ok == NOTIFY_DONE) {
	241	request_module("cryptomgr");
	242	ok = blocking_notifier_call_chain(&crypto_chain, val, v);
	243	}
	244
	245	return ok;
	246	}
	247	EXPORT_SYMBOL_GPL(crypto_probing_notify);
	248
b9c55aa4 HX	249	struct crypto_alg crypto_alg_mod_lookup(const char name, u32 type, u32 mask)
	250	{
	251	struct crypto_alg *alg;
	252	struct crypto_alg *larval;
	253	int ok;
	254
ff753308	255	if (!((type \| mask) & CRYPTO_ALG_TESTED)) {
73d3864a HX	256	type \|= CRYPTO_ALG_TESTED;
	257	mask \|= CRYPTO_ALG_TESTED;
	258	}
	259
b9c55aa4	260	larval = crypto_larval_lookup(name, type, mask);
6bfd4809	261	if (IS_ERR(larval) \|\| !crypto_is_larval(larval))
2825982d HX	262	return larval;
2825982d HX	263
73d3864a	264	ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);
2b8c19db HX	265
2b8c19db HX	266	if (ok == NOTIFY_STOP)
2825982d HX	267	alg = crypto_larval_wait(larval);
	268	else {
	269	crypto_mod_put(larval);
6bfd4809	270	alg = ERR_PTR(-ENOENT);
2825982d HX	271	}
	272	crypto_larval_kill(larval);
	273	return alg;
176c3652	274	}
492e2b63	275	EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);
176c3652	276
27d2a330	277	static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
1da177e4	278	{
27d2a330	279	const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;
e853c3cf	280
27d2a330 HX	281	if (type_obj)
27d2a330 HX	282	return type_obj->init(tfm, type, mask);
e853c3cf	283
1da177e4 LT	284	switch (crypto_tfm_alg_type(tfm)) {
	285	case CRYPTO_ALG_TYPE_CIPHER:
	286	return crypto_init_cipher_ops(tfm);
004a403c	287
1da177e4 LT	288	case CRYPTO_ALG_TYPE_COMPRESS:
1da177e4 LT	289	return crypto_init_compress_ops(tfm);
3d01a33b	290
1da177e4 LT	291	default:
	292	break;
	293	}
3d01a33b	294
1da177e4 LT	295	BUG();
	296	return -EINVAL;
	297	}
	298
	299	static void crypto_exit_ops(struct crypto_tfm *tfm)
	300	{
e853c3cf HX	301	const struct crypto_type *type = tfm->__crt_alg->cra_type;
	302
	303	if (type) {
4a779486 HX	304	if (tfm->exit)
4a779486 HX	305	tfm->exit(tfm);
e853c3cf HX	306	return;
	307	}
	308
1da177e4 LT	309	switch (crypto_tfm_alg_type(tfm)) {
	310	case CRYPTO_ALG_TYPE_CIPHER:
	311	crypto_exit_cipher_ops(tfm);
	312	break;
6941c3a0	313
1da177e4 LT	314	case CRYPTO_ALG_TYPE_COMPRESS:
	315	crypto_exit_compress_ops(tfm);
	316	break;
3d01a33b	317
1da177e4 LT	318	default:
1da177e4 LT	319	BUG();
1da177e4 LT	320	}
	321	}
	322
27d2a330	323	static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
fbdae9f3	324	{
27d2a330	325	const struct crypto_type *type_obj = alg->cra_type;
fbdae9f3 HX	326	unsigned int len;
fbdae9f3 HX	327
e853c3cf	328	len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
27d2a330 HX	329	if (type_obj)
27d2a330 HX	330	return len + type_obj->ctxsize(alg, type, mask);
e853c3cf	331
fbdae9f3 HX	332	switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
	333	default:
	334	BUG();
	335
	336	case CRYPTO_ALG_TYPE_CIPHER:
f1ddcaf3	337	len += crypto_cipher_ctxsize(alg);
fbdae9f3	338	break;
6941c3a0	339
fbdae9f3	340	case CRYPTO_ALG_TYPE_COMPRESS:
f1ddcaf3	341	len += crypto_compress_ctxsize(alg);
fbdae9f3 HX	342	break;
	343	}
	344
e853c3cf	345	return len;
fbdae9f3 HX	346	}
fbdae9f3 HX	347
6bfd4809 HX	348	void crypto_shoot_alg(struct crypto_alg *alg)
	349	{
	350	down_write(&crypto_alg_sem);
	351	alg->cra_flags \|= CRYPTO_ALG_DYING;
	352	up_write(&crypto_alg_sem);
	353	}
	354	EXPORT_SYMBOL_GPL(crypto_shoot_alg);
	355
27d2a330 HX	356	struct crypto_tfm __crypto_alloc_tfm(struct crypto_alg alg, u32 type,
27d2a330 HX	357	u32 mask)
1da177e4 LT	358	{
1da177e4 LT	359	struct crypto_tfm *tfm = NULL;
fbdae9f3	360	unsigned int tfm_size;
6bfd4809	361	int err = -ENOMEM;
fbdae9f3	362
27d2a330	363	tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
bbeb563f	364	tfm = kzalloc(tfm_size, GFP_KERNEL);
1da177e4	365	if (tfm == NULL)
9765d262	366	goto out_err;
1da177e4	367
1da177e4	368	tfm->__crt_alg = alg;
6bfd4809	369
27d2a330	370	err = crypto_init_ops(tfm, type, mask);
6bfd4809	371	if (err)
1da177e4	372	goto out_free_tfm;
c7fc0599	373
4a779486	374	if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
c7fc0599	375	goto cra_init_failed;
1da177e4 LT	376
	377	goto out;
	378
c7fc0599 HX	379	cra_init_failed:
c7fc0599 HX	380	crypto_exit_ops(tfm);
1da177e4	381	out_free_tfm:
4a779486 HX	382	if (err == -EAGAIN)
4a779486 HX	383	crypto_shoot_alg(alg);
1da177e4	384	kfree(tfm);
9765d262	385	out_err:
6bfd4809	386	tfm = ERR_PTR(err);
1da177e4 LT	387	out:
	388	return tfm;
	389	}
6bfd4809 HX	390	EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
6bfd4809 HX	391
6d7d684d HX	392	/*
	393	* crypto_alloc_base - Locate algorithm and allocate transform
	394	* @alg_name: Name of algorithm
	395	* @type: Type of algorithm
	396	* @mask: Mask for type comparison
	397	*
7b0bac64	398	* This function should not be used by new algorithm types.
fd1a1900	399	* Please use crypto_alloc_tfm instead.
7b0bac64	400	*
6d7d684d HX	401	* crypto_alloc_base() will first attempt to locate an already loaded
	402	* algorithm. If that fails and the kernel supports dynamically loadable
	403	* modules, it will then attempt to load a module of the same name or
	404	* alias. If that fails it will send a query to any loaded crypto manager
	405	* to construct an algorithm on the fly. A refcount is grabbed on the
	406	* algorithm which is then associated with the new transform.
	407	*
	408	* The returned transform is of a non-determinate type. Most people
	409	* should use one of the more specific allocation functions such as
	410	* crypto_alloc_blkcipher.
	411	*
	412	* In case of error the return value is an error pointer.
	413	*/
	414	struct crypto_tfm crypto_alloc_base(const char alg_name, u32 type, u32 mask)
	415	{
	416	struct crypto_tfm *tfm;
	417	int err;
	418
	419	for (;;) {
	420	struct crypto_alg *alg;
	421
	422	alg = crypto_alg_mod_lookup(alg_name, type, mask);
9765d262 AM	423	if (IS_ERR(alg)) {
9765d262 AM	424	err = PTR_ERR(alg);
6d7d684d	425	goto err;
9765d262	426	}
6d7d684d	427
27d2a330	428	tfm = __crypto_alloc_tfm(alg, type, mask);
6d7d684d	429	if (!IS_ERR(tfm))
9765d262	430	return tfm;
6d7d684d HX	431
	432	crypto_mod_put(alg);
	433	err = PTR_ERR(tfm);
	434
	435	err:
	436	if (err != -EAGAIN)
	437	break;
	438	if (signal_pending(current)) {
	439	err = -EINTR;
	440	break;
	441	}
9765d262	442	}
6d7d684d	443
9765d262	444	return ERR_PTR(err);
6d7d684d HX	445	}
6d7d684d HX	446	EXPORT_SYMBOL_GPL(crypto_alloc_base);
7b0bac64	447
3f683d61 HX	448	void crypto_create_tfm(struct crypto_alg alg,
3f683d61 HX	449	const struct crypto_type *frontend)
7b0bac64 HX	450	{
	451	char *mem;
	452	struct crypto_tfm *tfm = NULL;
	453	unsigned int tfmsize;
	454	unsigned int total;
	455	int err = -ENOMEM;
	456
	457	tfmsize = frontend->tfmsize;
2ca33da1	458	total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);
7b0bac64 HX	459
	460	mem = kzalloc(total, GFP_KERNEL);
	461	if (mem == NULL)
	462	goto out_err;
	463
	464	tfm = (struct crypto_tfm *)(mem + tfmsize);
	465	tfm->__crt_alg = alg;
	466
2ca33da1	467	err = frontend->init_tfm(tfm);
7b0bac64 HX	468	if (err)
	469	goto out_free_tfm;
	470
	471	if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
	472	goto cra_init_failed;
	473
	474	goto out;
	475
	476	cra_init_failed:
	477	crypto_exit_ops(tfm);
	478	out_free_tfm:
	479	if (err == -EAGAIN)
	480	crypto_shoot_alg(alg);
	481	kfree(mem);
	482	out_err:
3f683d61	483	mem = ERR_PTR(err);
7b0bac64	484	out:
3f683d61	485	return mem;
7b0bac64 HX	486	}
	487	EXPORT_SYMBOL_GPL(crypto_create_tfm);
	488
d06854f0 HX	489	struct crypto_alg crypto_find_alg(const char alg_name,
	490	const struct crypto_type *frontend,
	491	u32 type, u32 mask)
	492	{
	493	struct crypto_alg (lookup)(const char *name, u32 type, u32 mask) =
	494	crypto_alg_mod_lookup;
	495
	496	if (frontend) {
	497	type &= frontend->maskclear;
	498	mask &= frontend->maskclear;
	499	type \|= frontend->type;
	500	mask \|= frontend->maskset;
	501
	502	if (frontend->lookup)
	503	lookup = frontend->lookup;
	504	}
	505
	506	return lookup(alg_name, type, mask);
	507	}
	508	EXPORT_SYMBOL_GPL(crypto_find_alg);
	509
7b0bac64 HX	510	/*
	511	* crypto_alloc_tfm - Locate algorithm and allocate transform
	512	* @alg_name: Name of algorithm
	513	* @frontend: Frontend algorithm type
	514	* @type: Type of algorithm
	515	* @mask: Mask for type comparison
	516	*
	517	* crypto_alloc_tfm() will first attempt to locate an already loaded
	518	* algorithm. If that fails and the kernel supports dynamically loadable
	519	* modules, it will then attempt to load a module of the same name or
	520	* alias. If that fails it will send a query to any loaded crypto manager
	521	* to construct an algorithm on the fly. A refcount is grabbed on the
	522	* algorithm which is then associated with the new transform.
	523	*
	524	* The returned transform is of a non-determinate type. Most people
	525	* should use one of the more specific allocation functions such as
	526	* crypto_alloc_blkcipher.
	527	*
	528	* In case of error the return value is an error pointer.
	529	*/
3f683d61 HX	530	void crypto_alloc_tfm(const char alg_name,
3f683d61 HX	531	const struct crypto_type *frontend, u32 type, u32 mask)
7b0bac64	532	{
3f683d61	533	void *tfm;
7b0bac64 HX	534	int err;
7b0bac64 HX	535
7b0bac64 HX	536	for (;;) {
	537	struct crypto_alg *alg;
	538
d06854f0	539	alg = crypto_find_alg(alg_name, frontend, type, mask);
7b0bac64 HX	540	if (IS_ERR(alg)) {
	541	err = PTR_ERR(alg);
	542	goto err;
	543	}
	544
	545	tfm = crypto_create_tfm(alg, frontend);
	546	if (!IS_ERR(tfm))
	547	return tfm;
	548
	549	crypto_mod_put(alg);
	550	err = PTR_ERR(tfm);
	551
	552	err:
	553	if (err != -EAGAIN)
	554	break;
	555	if (signal_pending(current)) {
	556	err = -EINTR;
	557	break;
	558	}
	559	}
	560
	561	return ERR_PTR(err);
	562	}
	563	EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
7b2cd92a	564
6d7d684d	565	/*
7b2cd92a HX	566	* crypto_destroy_tfm - Free crypto transform
7b2cd92a HX	567	* @mem: Start of tfm slab
6d7d684d HX	568	* @tfm: Transform to free
6d7d684d HX	569	*
7b2cd92a	570	* This function frees up the transform and any associated resources,
6d7d684d HX	571	* then drops the refcount on the associated algorithm.
6d7d684d HX	572	*/
7b2cd92a	573	void crypto_destroy_tfm(void mem, struct crypto_tfm tfm)
1da177e4	574	{
a61cc448	575	struct crypto_alg *alg;
a61cc448	576
7b2cd92a	577	if (unlikely(!mem))
a61cc448 JJ	578	return;
	579
	580	alg = tfm->__crt_alg;
1da177e4	581
4a779486	582	if (!tfm->exit && alg->cra_exit)
c7fc0599	583	alg->cra_exit(tfm);
1da177e4	584	crypto_exit_ops(tfm);
72fa4919	585	crypto_mod_put(alg);
811d8f06	586	kzfree(mem);
1da177e4	587	}
7b2cd92a	588	EXPORT_SYMBOL_GPL(crypto_destroy_tfm);
fce32d70 HX	589
	590	int crypto_has_alg(const char *name, u32 type, u32 mask)
	591	{
	592	int ret = 0;
	593	struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);
3d01a33b	594
fce32d70 HX	595	if (!IS_ERR(alg)) {
	596	crypto_mod_put(alg);
	597	ret = 1;
	598	}
3d01a33b	599
fce32d70 HX	600	return ret;
	601	}
	602	EXPORT_SYMBOL_GPL(crypto_has_alg);
c3715cb9 SS	603
	604	MODULE_DESCRIPTION("Cryptographic core API");
	605	MODULE_LICENSE("GPL");