linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * af_alg: User-space algorithm interface

 *

 * This file provides the user-space API for algorithms.

 *

 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>

 */

​

#include <linux/atomic.h>

#include <crypto/if_alg.h>

#include <linux/crypto.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/list.h>

#include <linux/module.h>

#include <linux/net.h>

#include <linux/rwsem.h>

#include <linux/sched/signal.h>

#include <linux/security.h>

​

struct alg_type_list {

    const struct af_alg_type *type;

    struct list_head list;

};

​

static atomic_long_t alg_memory_allocated;

​

static struct proto alg_proto = {

    .name           = "ALG",

    .owner          = THIS_MODULE,

    .memory_allocated   = &alg_memory_allocated,

    .obj_size       = sizeof(struct alg_sock),

};

​

static LIST_HEAD(alg_types);

static DECLARE_RWSEM(alg_types_sem);

​

static const struct af_alg_type *alg_get_type(const char *name)

{

    const struct af_alg_type *type = ERR_PTR(-ENOENT);

    struct alg_type_list *node;

​

    down_read(&alg_types_sem);

    list_for_each_entry(node, &alg_types, list) {

        if (strcmp(node->type->name, name))

            continue;

​

        if (try_module_get(node->type->owner))

            type = node->type;

        break;

    }

    up_read(&alg_types_sem);

​

    return type;

}

​

int af_alg_register_type(const struct af_alg_type *type)

{

    struct alg_type_list *node;

    int err = -EEXIST;

​

    down_write(&alg_types_sem);