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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2019 Samsung Electronics Co., Ltd.
*/
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include "glob.h"
#include "crypto_ctx.h"
struct crypto_ctx_list {
spinlock_t ctx_lock;
int avail_ctx;
struct list_head idle_ctx;
wait_queue_head_t ctx_wait;
};
static struct crypto_ctx_list ctx_list;
static inline void free_aead(struct crypto_aead *aead)
{
if (aead)
crypto_free_aead(aead);
}
static struct crypto_aead *alloc_aead(int id)
{
struct crypto_aead *tfm = NULL;
switch (id) {
case CRYPTO_AEAD_AES_GCM:
tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
break;
case CRYPTO_AEAD_AES_CCM:
tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
break;
default:
pr_err("Does not support encrypt ahead(id : %d)\n", id);
return NULL;
}
if (IS_ERR(tfm)) {
pr_err("Failed to alloc encrypt aead : %ld\n", PTR_ERR(tfm));
return NULL;
}
return tfm;
}
static void ctx_free(struct ksmbd_crypto_ctx *ctx)
{
int i;
for (i = 0; i < CRYPTO_AEAD_MAX; i++)
free_aead(ctx->ccmaes[i]);
kfree(ctx);
}
static struct ksmbd_crypto_ctx *ksmbd_find_crypto_ctx(void)
{
struct ksmbd_crypto_ctx *ctx;
while (1) {
spin_lock(&ctx_list.ctx_lock);
if (!list_empty(&ctx_list.idle_ctx)) {
ctx = list_entry(ctx_list.idle_ctx.next,
struct ksmbd_crypto_ctx,
list);
list_del(&ctx->list);
spin_unlock(&ctx_list.ctx_lock);
return ctx;
}
if (ctx_list.avail_ctx > num_online_cpus()) {
spin_unlock(&ctx_list.ctx_lock);
wait_event(ctx_list.ctx_wait,
!list_empty(&ctx_list.idle_ctx));
continue;
}
ctx_list.avail_ctx++;
spin_unlock(&ctx_list.ctx_lock);
ctx = kzalloc_obj(struct ksmbd_crypto_ctx, KSMBD_DEFAULT_GFP);
if (!ctx) {
spin_lock(&ctx_list.ctx_lock);
ctx_list.avail_ctx--;
spin_unlock(&ctx_list.ctx_lock);
wait_event(ctx_list.ctx_wait,
!list_empty(&ctx_list.idle_ctx));
continue;
}
break;
}
return ctx;
}
void ksmbd_release_crypto_ctx(struct ksmbd_crypto_ctx *ctx)
{
if (!ctx)
return;
spin_lock(&ctx_list.ctx_lock);
if (ctx_list.avail_ctx <= num_online_cpus()) {
list_add(&ctx->list, &ctx_list.idle_ctx);
spin_unlock(&ctx_list.ctx_lock);
wake_up(&ctx_list.ctx_wait);
return;
}
ctx_list.avail_ctx--;
spin_unlock(&ctx_list.ctx_lock);
ctx_free(ctx);
}
static struct ksmbd_crypto_ctx *____crypto_aead_ctx_find(int id)
{
struct ksmbd_crypto_ctx *ctx;
if (id >= CRYPTO_AEAD_MAX)
return NULL;
ctx = ksmbd_find_crypto_ctx();
if (ctx->ccmaes[id])
return ctx;
ctx->ccmaes[id] = alloc_aead(id);
if (ctx->ccmaes[id])
return ctx;
ksmbd_release_crypto_ctx(ctx);
return NULL;
}
struct ksmbd_crypto_ctx *ksmbd_crypto_ctx_find_gcm(void)
{
return ____crypto_aead_ctx_find(CRYPTO_AEAD_AES_GCM);
}
struct ksmbd_crypto_ctx *ksmbd_crypto_ctx_find_ccm(void)
{
return ____crypto_aead_ctx_find(CRYPTO_AEAD_AES_CCM);
}
void ksmbd_crypto_destroy(void)
{
struct ksmbd_crypto_ctx *ctx;
while (!list_empty(&ctx_list.idle_ctx)) {
ctx = list_entry(ctx_list.idle_ctx.next,
struct ksmbd_crypto_ctx,
list);
list_del(&ctx->list);
ctx_free(ctx);
}
}
int ksmbd_crypto_create(void)
{
struct ksmbd_crypto_ctx *ctx;
spin_lock_init(&ctx_list.ctx_lock);
INIT_LIST_HEAD(&ctx_list.idle_ctx);
init_waitqueue_head(&ctx_list.ctx_wait);
ctx_list.avail_ctx = 1;
ctx = kzalloc_obj(struct ksmbd_crypto_ctx, KSMBD_DEFAULT_GFP);
if (!ctx)
return -ENOMEM;
list_add(&ctx->list, &ctx_list.idle_ctx);
return 0;
}
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