[CRYPTO] cryptd: Add software async crypto daemon
This patch adds the cryptd module which is a template that takes a synchronous software crypto algorithm and converts it to an asynchronous one by executing it in a kernel thread. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
parent
a73e69965f
commit
124b53d020
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@ -175,6 +175,15 @@ config CRYPTO_LRW
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The first 128, 192 or 256 bits in the key are used for AES and the
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rest is used to tie each cipher block to its logical position.
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config CRYPTO_CRYPTD
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tristate "Software async crypto daemon"
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select CRYPTO_ABLKCIPHER
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select CRYPTO_MANAGER
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help
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This is a generic software asynchronous crypto daemon that
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converts an arbitrary synchronous software crypto algorithm
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into an asynchronous algorithm that executes in a kernel thread.
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config CRYPTO_DES
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tristate "DES and Triple DES EDE cipher algorithms"
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select CRYPTO_ALGAPI
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@ -30,6 +30,7 @@ obj-$(CONFIG_CRYPTO_ECB) += ecb.o
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obj-$(CONFIG_CRYPTO_CBC) += cbc.o
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obj-$(CONFIG_CRYPTO_PCBC) += pcbc.o
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obj-$(CONFIG_CRYPTO_LRW) += lrw.o
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obj-$(CONFIG_CRYPTO_CRYPTD) += cryptd.o
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obj-$(CONFIG_CRYPTO_DES) += des.o
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obj-$(CONFIG_CRYPTO_FCRYPT) += fcrypt.o
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obj-$(CONFIG_CRYPTO_BLOWFISH) += blowfish.o
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@ -0,0 +1,375 @@
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/*
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* Software async crypto daemon.
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*
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/algapi.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/scatterlist.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#define CRYPTD_MAX_QLEN 100
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struct cryptd_state {
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spinlock_t lock;
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struct mutex mutex;
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struct crypto_queue queue;
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struct task_struct *task;
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};
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struct cryptd_instance_ctx {
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struct crypto_spawn spawn;
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struct cryptd_state *state;
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};
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struct cryptd_blkcipher_ctx {
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struct crypto_blkcipher *child;
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};
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struct cryptd_blkcipher_request_ctx {
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crypto_completion_t complete;
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};
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static inline struct cryptd_state *cryptd_get_state(struct crypto_tfm *tfm)
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{
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struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
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struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
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return ictx->state;
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}
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static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
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const u8 *key, unsigned int keylen)
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{
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struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
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struct crypto_blkcipher *child = ctx->child;
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int err;
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crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_blkcipher_setkey(child, key, keylen);
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crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
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CRYPTO_TFM_RES_MASK);
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return err;
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}
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static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
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struct crypto_blkcipher *child,
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int err,
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int (*crypt)(struct blkcipher_desc *desc,
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struct scatterlist *dst,
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struct scatterlist *src,
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unsigned int len))
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{
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struct cryptd_blkcipher_request_ctx *rctx;
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struct blkcipher_desc desc;
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rctx = ablkcipher_request_ctx(req);
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if (unlikely(err == -EINPROGRESS)) {
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rctx->complete(&req->base, err);
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return;
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}
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desc.tfm = child;
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desc.info = req->info;
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desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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err = crypt(&desc, req->dst, req->src, req->nbytes);
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req->base.complete = rctx->complete;
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local_bh_disable();
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req->base.complete(&req->base, err);
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local_bh_enable();
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}
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static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
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{
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struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
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struct crypto_blkcipher *child = ctx->child;
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cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
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crypto_blkcipher_crt(child)->encrypt);
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}
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static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
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{
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struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
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struct crypto_blkcipher *child = ctx->child;
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cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
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crypto_blkcipher_crt(child)->decrypt);
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}
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static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
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crypto_completion_t complete)
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{
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struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
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struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
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struct cryptd_state *state =
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cryptd_get_state(crypto_ablkcipher_tfm(tfm));
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int err;
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rctx->complete = req->base.complete;
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req->base.complete = complete;
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spin_lock_bh(&state->lock);
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err = ablkcipher_enqueue_request(crypto_ablkcipher_alg(tfm), req);
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spin_unlock_bh(&state->lock);
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wake_up_process(state->task);
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return err;
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}
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static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
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{
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return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
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}
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static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
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{
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return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
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}
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static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
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struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
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struct crypto_spawn *spawn = &ictx->spawn;
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struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_blkcipher *cipher;
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cipher = crypto_spawn_blkcipher(spawn);
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if (IS_ERR(cipher))
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return PTR_ERR(cipher);
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ctx->child = cipher;
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tfm->crt_ablkcipher.reqsize =
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sizeof(struct cryptd_blkcipher_request_ctx);
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return 0;
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}
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static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
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{
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struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
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struct cryptd_state *state = cryptd_get_state(tfm);
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int active;
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mutex_lock(&state->mutex);
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active = ablkcipher_tfm_in_queue(__crypto_ablkcipher_cast(tfm));
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mutex_unlock(&state->mutex);
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BUG_ON(active);
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crypto_free_blkcipher(ctx->child);
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}
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static struct crypto_instance *cryptd_alloc_instance(struct crypto_alg *alg,
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struct cryptd_state *state)
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{
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struct crypto_instance *inst;
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struct cryptd_instance_ctx *ctx;
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int err;
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inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
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if (IS_ERR(inst))
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goto out;
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err = -ENAMETOOLONG;
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if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
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"cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
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goto out_free_inst;
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ctx = crypto_instance_ctx(inst);
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err = crypto_init_spawn(&ctx->spawn, alg, inst,
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CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
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if (err)
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goto out_free_inst;
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ctx->state = state;
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memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
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inst->alg.cra_priority = alg->cra_priority + 50;
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inst->alg.cra_blocksize = alg->cra_blocksize;
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inst->alg.cra_alignmask = alg->cra_alignmask;
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out:
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return inst;
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out_free_inst:
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kfree(inst);
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inst = ERR_PTR(err);
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goto out;
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}
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static struct crypto_instance *cryptd_alloc_blkcipher(
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struct rtattr **tb, struct cryptd_state *state)
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{
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struct crypto_instance *inst;
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struct crypto_alg *alg;
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alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
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CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
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if (IS_ERR(alg))
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return ERR_PTR(PTR_ERR(alg));
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inst = cryptd_alloc_instance(alg, state);
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if (IS_ERR(inst))
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goto out_put_alg;
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inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_ASYNC;
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inst->alg.cra_type = &crypto_ablkcipher_type;
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inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
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inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
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inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
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inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
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inst->alg.cra_init = cryptd_blkcipher_init_tfm;
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inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
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inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
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inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
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inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
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inst->alg.cra_ablkcipher.queue = &state->queue;
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out_put_alg:
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crypto_mod_put(alg);
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return inst;
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}
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static struct cryptd_state state;
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static struct crypto_instance *cryptd_alloc(struct rtattr **tb)
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{
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struct crypto_attr_type *algt;
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algt = crypto_get_attr_type(tb);
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if (IS_ERR(algt))
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return ERR_PTR(PTR_ERR(algt));
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switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
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case CRYPTO_ALG_TYPE_BLKCIPHER:
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return cryptd_alloc_blkcipher(tb, &state);
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}
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return ERR_PTR(-EINVAL);
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}
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static void cryptd_free(struct crypto_instance *inst)
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{
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struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
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crypto_drop_spawn(&ctx->spawn);
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kfree(inst);
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}
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static struct crypto_template cryptd_tmpl = {
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.name = "cryptd",
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.alloc = cryptd_alloc,
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.free = cryptd_free,
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.module = THIS_MODULE,
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};
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static inline int cryptd_create_thread(struct cryptd_state *state,
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int (*fn)(void *data), const char *name)
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{
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spin_lock_init(&state->lock);
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mutex_init(&state->mutex);
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crypto_init_queue(&state->queue, CRYPTD_MAX_QLEN);
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state->task = kthread_create(fn, state, name);
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if (IS_ERR(state->task))
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return PTR_ERR(state->task);
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return 0;
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}
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static inline void cryptd_stop_thread(struct cryptd_state *state)
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{
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BUG_ON(state->queue.qlen);
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kthread_stop(state->task);
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}
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static int cryptd_thread(void *data)
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{
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struct cryptd_state *state = data;
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int stop;
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do {
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struct crypto_async_request *req, *backlog;
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mutex_lock(&state->mutex);
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__set_current_state(TASK_INTERRUPTIBLE);
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spin_lock_bh(&state->lock);
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backlog = crypto_get_backlog(&state->queue);
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req = crypto_dequeue_request(&state->queue);
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spin_unlock_bh(&state->lock);
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stop = kthread_should_stop();
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if (stop || req) {
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__set_current_state(TASK_RUNNING);
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if (req) {
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if (backlog)
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backlog->complete(backlog,
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-EINPROGRESS);
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req->complete(req, 0);
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}
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}
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mutex_unlock(&state->mutex);
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schedule();
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} while (!stop);
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return 0;
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}
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static int __init cryptd_init(void)
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{
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int err;
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err = cryptd_create_thread(&state, cryptd_thread, "cryptd");
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if (err)
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return err;
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err = crypto_register_template(&cryptd_tmpl);
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if (err)
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kthread_stop(state.task);
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return err;
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}
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static void __exit cryptd_exit(void)
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{
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cryptd_stop_thread(&state);
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crypto_unregister_template(&cryptd_tmpl);
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}
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module_init(cryptd_init);
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module_exit(cryptd_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Software async crypto daemon");
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@ -138,6 +138,12 @@ static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
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return (void *)ALIGN(addr, align);
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}
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static inline struct crypto_instance *crypto_tfm_alg_instance(
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struct crypto_tfm *tfm)
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{
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return container_of(tfm->__crt_alg, struct crypto_instance, alg);
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}
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static inline void *crypto_instance_ctx(struct crypto_instance *inst)
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{
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return inst->__ctx;
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@ -154,6 +160,15 @@ static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
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return crypto_tfm_ctx(&tfm->base);
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}
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static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
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struct crypto_spawn *spawn)
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{
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u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
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u32 mask = CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC;
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return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
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}
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static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
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{
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return crypto_tfm_ctx(&tfm->base);
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