Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 675 insertions, 0 deletions

diff --git a/crypto/mcryptd.c b/crypto/mcryptd.c
new file mode 100644
index 000000000..f14152147
--- /dev/null
+++ b/crypto/mcryptd.c
@@ -0,0 +1,675 @@
+/*
+ * Software multibuffer async crypto daemon.
+ *
+ * Copyright (c) 2014 Tim Chen <tim.c.chen@linux.intel.com>
+ *
+ * Adapted from crypto daemon.
+ *
+ * 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 <crypto/algapi.h>
+#include <crypto/internal/hash.h>
+#include <crypto/internal/aead.h>
+#include <crypto/mcryptd.h>
+#include <crypto/crypto_wq.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/scatterlist.h>
+#include <linux/sched.h>
+#include <linux/sched/stat.h>
+#include <linux/slab.h>
+
+#define MCRYPTD_MAX_CPU_QLEN 100
+#define MCRYPTD_BATCH 9
+
+static void *mcryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
+				   unsigned int tail);
+
+struct mcryptd_flush_list {
+	struct list_head list;
+	struct mutex lock;
+};
+
+static struct mcryptd_flush_list __percpu *mcryptd_flist;
+
+struct hashd_instance_ctx {
+	struct crypto_ahash_spawn spawn;
+	struct mcryptd_queue *queue;
+};
+
+static void mcryptd_queue_worker(struct work_struct *work);
+
+void mcryptd_arm_flusher(struct mcryptd_alg_cstate *cstate, unsigned long delay)
+{
+	struct mcryptd_flush_list *flist;
+
+	if (!cstate->flusher_engaged) {
+		/* put the flusher on the flush list */
+		flist = per_cpu_ptr(mcryptd_flist, smp_processor_id());
+		mutex_lock(&flist->lock);
+		list_add_tail(&cstate->flush_list, &flist->list);
+		cstate->flusher_engaged = true;
+		cstate->next_flush = jiffies + delay;
+		queue_delayed_work_on(smp_processor_id(), kcrypto_wq,
+			&cstate->flush, delay);
+		mutex_unlock(&flist->lock);
+	}
+}
+EXPORT_SYMBOL(mcryptd_arm_flusher);
+
+static int mcryptd_init_queue(struct mcryptd_queue *queue,
+			     unsigned int max_cpu_qlen)
+{
+	int cpu;
+	struct mcryptd_cpu_queue *cpu_queue;
+
+	queue->cpu_queue = alloc_percpu(struct mcryptd_cpu_queue);
+	pr_debug("mqueue:%p mcryptd_cpu_queue %p\n", queue, queue->cpu_queue);
+	if (!queue->cpu_queue)
+		return -ENOMEM;
+	for_each_possible_cpu(cpu) {
+		cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
+		pr_debug("cpu_queue #%d %p\n", cpu, queue->cpu_queue);
+		crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
+		INIT_WORK(&cpu_queue->work, mcryptd_queue_worker);
+		spin_lock_init(&cpu_queue->q_lock);
+	}
+	return 0;
+}
+
+static void mcryptd_fini_queue(struct mcryptd_queue *queue)
+{
+	int cpu;
+	struct mcryptd_cpu_queue *cpu_queue;
+
+	for_each_possible_cpu(cpu) {
+		cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
+		BUG_ON(cpu_queue->queue.qlen);
+	}
+	free_percpu(queue->cpu_queue);
+}
+
+static int mcryptd_enqueue_request(struct mcryptd_queue *queue,
+				  struct crypto_async_request *request,
+				  struct mcryptd_hash_request_ctx *rctx)
+{
+	int cpu, err;
+	struct mcryptd_cpu_queue *cpu_queue;
+
+	cpu_queue = raw_cpu_ptr(queue->cpu_queue);
+	spin_lock(&cpu_queue->q_lock);
+	cpu = smp_processor_id();
+	rctx->tag.cpu = smp_processor_id();
+
+	err = crypto_enqueue_request(&cpu_queue->queue, request);
+	pr_debug("enqueue request: cpu %d cpu_queue %p request %p\n",
+		 cpu, cpu_queue, request);
+	spin_unlock(&cpu_queue->q_lock);
+	queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
+
+	return err;
+}
+
+/*
+ * Try to opportunisticlly flush the partially completed jobs if
+ * crypto daemon is the only task running.
+ */
+static void mcryptd_opportunistic_flush(void)
+{
+	struct mcryptd_flush_list *flist;
+	struct mcryptd_alg_cstate *cstate;
+
+	flist = per_cpu_ptr(mcryptd_flist, smp_processor_id());
+	while (single_task_running()) {
+		mutex_lock(&flist->lock);
+		cstate = list_first_entry_or_null(&flist->list,
+				struct mcryptd_alg_cstate, flush_list);
+		if (!cstate || !cstate->flusher_engaged) {
+			mutex_unlock(&flist->lock);
+			return;
+		}
+		list_del(&cstate->flush_list);
+		cstate->flusher_engaged = false;
+		mutex_unlock(&flist->lock);
+		cstate->alg_state->flusher(cstate);
+	}
+}
+
+/*
+ * Called in workqueue context, do one real cryption work (via
+ * req->complete) and reschedule itself if there are more work to
+ * do.
+ */
+static void mcryptd_queue_worker(struct work_struct *work)
+{
+	struct mcryptd_cpu_queue *cpu_queue;
+	struct crypto_async_request *req, *backlog;
+	int i;
+
+	/*
+	 * Need to loop through more than once for multi-buffer to
+	 * be effective.
+	 */
+
+	cpu_queue = container_of(work, struct mcryptd_cpu_queue, work);
+	i = 0;
+	while (i < MCRYPTD_BATCH || single_task_running()) {
+
+		spin_lock_bh(&cpu_queue->q_lock);
+		backlog = crypto_get_backlog(&cpu_queue->queue);
+		req = crypto_dequeue_request(&cpu_queue->queue);
+		spin_unlock_bh(&cpu_queue->q_lock);
+
+		if (!req) {
+			mcryptd_opportunistic_flush();
+			return;
+		}
+
+		if (backlog)
+			backlog->complete(backlog, -EINPROGRESS);
+		req->complete(req, 0);
+		if (!cpu_queue->queue.qlen)
+			return;
+		++i;
+	}
+	if (cpu_queue->queue.qlen)
+		queue_work_on(smp_processor_id(), kcrypto_wq, &cpu_queue->work);
+}
+
+void mcryptd_flusher(struct work_struct *__work)
+{
+	struct	mcryptd_alg_cstate	*alg_cpu_state;
+	struct	mcryptd_alg_state	*alg_state;
+	struct	mcryptd_flush_list	*flist;
+	int	cpu;
+
+	cpu = smp_processor_id();
+	alg_cpu_state = container_of(to_delayed_work(__work),
+				     struct mcryptd_alg_cstate, flush);
+	alg_state = alg_cpu_state->alg_state;
+	if (alg_cpu_state->cpu != cpu)
+		pr_debug("mcryptd error: work on cpu %d, should be cpu %d\n",
+				cpu, alg_cpu_state->cpu);
+
+	if (alg_cpu_state->flusher_engaged) {
+		flist = per_cpu_ptr(mcryptd_flist, cpu);
+		mutex_lock(&flist->lock);
+		list_del(&alg_cpu_state->flush_list);
+		alg_cpu_state->flusher_engaged = false;
+		mutex_unlock(&flist->lock);
+		alg_state->flusher(alg_cpu_state);
+	}
+}
+EXPORT_SYMBOL_GPL(mcryptd_flusher);
+
+static inline struct mcryptd_queue *mcryptd_get_queue(struct crypto_tfm *tfm)
+{
+	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
+	struct mcryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
+
+	return ictx->queue;
+}
+
+static void *mcryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
+				   unsigned int tail)
+{
+	char *p;
+	struct crypto_instance *inst;
+	int err;
+
+	p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
+	if (!p)
+		return ERR_PTR(-ENOMEM);
+
+	inst = (void *)(p + head);
+
+	err = -ENAMETOOLONG;
+	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+		    "mcryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
+		goto out_free_inst;
+
+	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
+
+	inst->alg.cra_priority = alg->cra_priority + 50;
+	inst->alg.cra_blocksize = alg->cra_blocksize;
+	inst->alg.cra_alignmask = alg->cra_alignmask;
+
+out:
+	return p;
+
+out_free_inst:
+	kfree(p);
+	p = ERR_PTR(err);
+	goto out;
+}
+
+static inline bool mcryptd_check_internal(struct rtattr **tb, u32 *type,
+					  u32 *mask)
+{
+	struct crypto_attr_type *algt;
+
+	algt = crypto_get_attr_type(tb);
+	if (IS_ERR(algt))
+		return false;
+
+	*type |= algt->type & CRYPTO_ALG_INTERNAL;
+	*mask |= algt->mask & CRYPTO_ALG_INTERNAL;
+
+	if (*type & *mask & CRYPTO_ALG_INTERNAL)
+		return true;
+	else
+		return false;
+}
+
+static int mcryptd_hash_init_tfm(struct crypto_tfm *tfm)
+{
+	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
+	struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
+	struct crypto_ahash_spawn *spawn = &ictx->spawn;
+	struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
+	struct crypto_ahash *hash;
+
+	hash = crypto_spawn_ahash(spawn);
+	if (IS_ERR(hash))
+		return PTR_ERR(hash);
+
+	ctx->child = hash;
+	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
+				 sizeof(struct mcryptd_hash_request_ctx) +
+				 crypto_ahash_reqsize(hash));
+	return 0;
+}
+
+static void mcryptd_hash_exit_tfm(struct crypto_tfm *tfm)
+{
+	struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	crypto_free_ahash(ctx->child);
+}
+
+static int mcryptd_hash_setkey(struct crypto_ahash *parent,
+				   const u8 *key, unsigned int keylen)
+{
+	struct mcryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
+	struct crypto_ahash *child = ctx->child;
+	int err;
+
+	crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+	crypto_ahash_set_flags(child, crypto_ahash_get_flags(parent) &
+				      CRYPTO_TFM_REQ_MASK);
+	err = crypto_ahash_setkey(child, key, keylen);
+	crypto_ahash_set_flags(parent, crypto_ahash_get_flags(child) &
+				       CRYPTO_TFM_RES_MASK);
+	return err;
+}
+
+static int mcryptd_hash_enqueue(struct ahash_request *req,
+				crypto_completion_t complete)
+{
+	int ret;
+
+	struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct mcryptd_queue *queue =
+		mcryptd_get_queue(crypto_ahash_tfm(tfm));
+
+	rctx->complete = req->base.complete;
+	req->base.complete = complete;
+
+	ret = mcryptd_enqueue_request(queue, &req->base, rctx);
+
+	return ret;
+}
+
+static void mcryptd_hash_init(struct crypto_async_request *req_async, int err)
+{
+	struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
+	struct crypto_ahash *child = ctx->child;
+	struct ahash_request *req = ahash_request_cast(req_async);
+	struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+	struct ahash_request *desc = &rctx->areq;
+
+	if (unlikely(err == -EINPROGRESS))
+		goto out;
+
+	ahash_request_set_tfm(desc, child);
+	ahash_request_set_callback(desc, CRYPTO_TFM_REQ_MAY_SLEEP,
+						rctx->complete, req_async);
+
+	rctx->out = req->result;
+	err = crypto_ahash_init(desc);
+
+out:
+	local_bh_disable();
+	rctx->complete(&req->base, err);
+	local_bh_enable();
+}
+
+static int mcryptd_hash_init_enqueue(struct ahash_request *req)
+{
+	return mcryptd_hash_enqueue(req, mcryptd_hash_init);
+}
+
+static void mcryptd_hash_update(struct crypto_async_request *req_async, int err)
+{
+	struct ahash_request *req = ahash_request_cast(req_async);
+	struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+
+	if (unlikely(err == -EINPROGRESS))
+		goto out;
+
+	rctx->out = req->result;
+	err = crypto_ahash_update(&rctx->areq);
+	if (err) {
+		req->base.complete = rctx->complete;
+		goto out;
+	}
+
+	return;
+out:
+	local_bh_disable();
+	rctx->complete(&req->base, err);
+	local_bh_enable();
+}
+
+static int mcryptd_hash_update_enqueue(struct ahash_request *req)
+{
+	return mcryptd_hash_enqueue(req, mcryptd_hash_update);
+}
+
+static void mcryptd_hash_final(struct crypto_async_request *req_async, int err)
+{
+	struct ahash_request *req = ahash_request_cast(req_async);
+	struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+
+	if (unlikely(err == -EINPROGRESS))
+		goto out;
+
+	rctx->out = req->result;
+	err = crypto_ahash_final(&rctx->areq);
+	if (err) {
+		req->base.complete = rctx->complete;
+		goto out;
+	}
+
+	return;
+out:
+	local_bh_disable();
+	rctx->complete(&req->base, err);
+	local_bh_enable();
+}
+
+static int mcryptd_hash_final_enqueue(struct ahash_request *req)
+{
+	return mcryptd_hash_enqueue(req, mcryptd_hash_final);
+}
+
+static void mcryptd_hash_finup(struct crypto_async_request *req_async, int err)
+{
+	struct ahash_request *req = ahash_request_cast(req_async);
+	struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+
+	if (unlikely(err == -EINPROGRESS))
+		goto out;
+	rctx->out = req->result;
+	err = crypto_ahash_finup(&rctx->areq);
+
+	if (err) {
+		req->base.complete = rctx->complete;
+		goto out;
+	}
+
+	return;
+out:
+	local_bh_disable();
+	rctx->complete(&req->base, err);
+	local_bh_enable();
+}
+
+static int mcryptd_hash_finup_enqueue(struct ahash_request *req)
+{
+	return mcryptd_hash_enqueue(req, mcryptd_hash_finup);
+}
+
+static void mcryptd_hash_digest(struct crypto_async_request *req_async, int err)
+{
+	struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
+	struct crypto_ahash *child = ctx->child;
+	struct ahash_request *req = ahash_request_cast(req_async);
+	struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+	struct ahash_request *desc = &rctx->areq;
+
+	if (unlikely(err == -EINPROGRESS))
+		goto out;
+
+	ahash_request_set_tfm(desc, child);
+	ahash_request_set_callback(desc, CRYPTO_TFM_REQ_MAY_SLEEP,
+						rctx->complete, req_async);
+
+	rctx->out = req->result;
+	err = crypto_ahash_init(desc) ?: crypto_ahash_finup(desc);
+
+out:
+	local_bh_disable();
+	rctx->complete(&req->base, err);
+	local_bh_enable();
+}
+
+static int mcryptd_hash_digest_enqueue(struct ahash_request *req)
+{
+	return mcryptd_hash_enqueue(req, mcryptd_hash_digest);
+}
+
+static int mcryptd_hash_export(struct ahash_request *req, void *out)
+{
+	struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+
+	return crypto_ahash_export(&rctx->areq, out);
+}
+
+static int mcryptd_hash_import(struct ahash_request *req, const void *in)
+{
+	struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+
+	return crypto_ahash_import(&rctx->areq, in);
+}
+
+static int mcryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
+			      struct mcryptd_queue *queue)
+{
+	struct hashd_instance_ctx *ctx;
+	struct ahash_instance *inst;
+	struct hash_alg_common *halg;
+	struct crypto_alg *alg;
+	u32 type = 0;
+	u32 mask = 0;
+	int err;
+
+	if (!mcryptd_check_internal(tb, &type, &mask))
+		return -EINVAL;
+
+	halg = ahash_attr_alg(tb[1], type, mask);
+	if (IS_ERR(halg))
+		return PTR_ERR(halg);
+
+	alg = &halg->base;
+	pr_debug("crypto: mcryptd hash alg: %s\n", alg->cra_name);
+	inst = mcryptd_alloc_instance(alg, ahash_instance_headroom(),
+					sizeof(*ctx));
+	err = PTR_ERR(inst);
+	if (IS_ERR(inst))
+		goto out_put_alg;
+
+	ctx = ahash_instance_ctx(inst);
+	ctx->queue = queue;
+
+	err = crypto_init_ahash_spawn(&ctx->spawn, halg,
+				      ahash_crypto_instance(inst));
+	if (err)
+		goto out_free_inst;
+
+	inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC |
+		(alg->cra_flags & (CRYPTO_ALG_INTERNAL |
+				   CRYPTO_ALG_OPTIONAL_KEY));
+
+	inst->alg.halg.digestsize = halg->digestsize;
+	inst->alg.halg.statesize = halg->statesize;
+	inst->alg.halg.base.cra_ctxsize = sizeof(struct mcryptd_hash_ctx);
+
+	inst->alg.halg.base.cra_init = mcryptd_hash_init_tfm;
+	inst->alg.halg.base.cra_exit = mcryptd_hash_exit_tfm;
+
+	inst->alg.init   = mcryptd_hash_init_enqueue;
+	inst->alg.update = mcryptd_hash_update_enqueue;
+	inst->alg.final  = mcryptd_hash_final_enqueue;
+	inst->alg.finup  = mcryptd_hash_finup_enqueue;
+	inst->alg.export = mcryptd_hash_export;
+	inst->alg.import = mcryptd_hash_import;
+	if (crypto_hash_alg_has_setkey(halg))
+		inst->alg.setkey = mcryptd_hash_setkey;
+	inst->alg.digest = mcryptd_hash_digest_enqueue;
+
+	err = ahash_register_instance(tmpl, inst);
+	if (err) {
+		crypto_drop_ahash(&ctx->spawn);
+out_free_inst:
+		kfree(inst);
+	}
+
+out_put_alg:
+	crypto_mod_put(alg);
+	return err;
+}
+
+static struct mcryptd_queue mqueue;
+
+static int mcryptd_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_DIGEST:
+		return mcryptd_create_hash(tmpl, tb, &mqueue);
+	break;
+	}
+
+	return -EINVAL;
+}
+
+static void mcryptd_free(struct crypto_instance *inst)
+{
+	struct mcryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
+	struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
+
+	switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
+	case CRYPTO_ALG_TYPE_AHASH:
+		crypto_drop_ahash(&hctx->spawn);
+		kfree(ahash_instance(inst));
+		return;
+	default:
+		crypto_drop_spawn(&ctx->spawn);
+		kfree(inst);
+	}
+}
+
+static struct crypto_template mcryptd_tmpl = {
+	.name = "mcryptd",
+	.create = mcryptd_create,
+	.free = mcryptd_free,
+	.module = THIS_MODULE,
+};
+
+struct mcryptd_ahash *mcryptd_alloc_ahash(const char *alg_name,
+					u32 type, u32 mask)
+{
+	char mcryptd_alg_name[CRYPTO_MAX_ALG_NAME];
+	struct crypto_ahash *tfm;
+
+	if (snprintf(mcryptd_alg_name, CRYPTO_MAX_ALG_NAME,
+		     "mcryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
+		return ERR_PTR(-EINVAL);
+	tfm = crypto_alloc_ahash(mcryptd_alg_name, type, mask);
+	if (IS_ERR(tfm))
+		return ERR_CAST(tfm);
+	if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
+		crypto_free_ahash(tfm);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return __mcryptd_ahash_cast(tfm);
+}
+EXPORT_SYMBOL_GPL(mcryptd_alloc_ahash);
+
+struct crypto_ahash *mcryptd_ahash_child(struct mcryptd_ahash *tfm)
+{
+	struct mcryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
+
+	return ctx->child;
+}
+EXPORT_SYMBOL_GPL(mcryptd_ahash_child);
+
+struct ahash_request *mcryptd_ahash_desc(struct ahash_request *req)
+{
+	struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+	return &rctx->areq;
+}
+EXPORT_SYMBOL_GPL(mcryptd_ahash_desc);
+
+void mcryptd_free_ahash(struct mcryptd_ahash *tfm)
+{
+	crypto_free_ahash(&tfm->base);
+}
+EXPORT_SYMBOL_GPL(mcryptd_free_ahash);
+
+static int __init mcryptd_init(void)
+{
+	int err, cpu;
+	struct mcryptd_flush_list *flist;
+
+	mcryptd_flist = alloc_percpu(struct mcryptd_flush_list);
+	for_each_possible_cpu(cpu) {
+		flist = per_cpu_ptr(mcryptd_flist, cpu);
+		INIT_LIST_HEAD(&flist->list);
+		mutex_init(&flist->lock);
+	}
+
+	err = mcryptd_init_queue(&mqueue, MCRYPTD_MAX_CPU_QLEN);
+	if (err) {
+		free_percpu(mcryptd_flist);
+		return err;
+	}
+
+	err = crypto_register_template(&mcryptd_tmpl);
+	if (err) {
+		mcryptd_fini_queue(&mqueue);
+		free_percpu(mcryptd_flist);
+	}
+
+	return err;
+}
+
+static void __exit mcryptd_exit(void)
+{
+	mcryptd_fini_queue(&mqueue);
+	crypto_unregister_template(&mcryptd_tmpl);
+	free_percpu(mcryptd_flist);
+}
+
+subsys_initcall(mcryptd_init);
+module_exit(mcryptd_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Software async multibuffer crypto daemon");
+MODULE_ALIAS_CRYPTO("mcryptd");