/* * pcrypt - Parallel crypto wrapper. * * Copyright (C) 2009 secunet Security Networks AG * Copyright (C) 2009 Steffen Klassert <steffen.klassert@secunet.com> * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. */ #include <crypto/algapi.h>#include <crypto/internal/aead.h>#include <linux/err.h>#include <linux/init.h>#include <linux/module.h>#include <linux/slab.h>#include <crypto/pcrypt.h> static struct padata_instance *pcrypt_enc_padata;static struct padata_instance *pcrypt_dec_padata;static struct workqueue_struct *encwq;static struct workqueue_struct *decwq; struct pcrypt_instance_ctx {	struct crypto_spawn spawn;	unsigned int tfm_count;}; struct pcrypt_aead_ctx {	struct crypto_aead *child;	unsigned int cb_cpu;}; static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,			      struct padata_instance *pinst){	unsigned int cpu_index, cpu, i; 	cpu = *cb_cpu; 	if (cpumask_test_cpu(cpu, cpu_active_mask))			goto out; 	cpu_index = cpu % cpumask_weight(cpu_active_mask); 	cpu = cpumask_first(cpu_active_mask);	for (i = 0; i < cpu_index; i++)		cpu = cpumask_next(cpu, cpu_active_mask); 	*cb_cpu = cpu; out:	return padata_do_parallel(pinst, padata, cpu);} static int pcrypt_aead_setkey(struct crypto_aead *parent,			      const u8 *key, unsigned int keylen){	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent); 	return crypto_aead_setkey(ctx->child, key, keylen);} static int pcrypt_aead_setauthsize(struct crypto_aead *parent,				   unsigned int authsize){	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent); 	return crypto_aead_setauthsize(ctx->child, authsize);} static void pcrypt_aead_serial(struct padata_priv *padata){	struct pcrypt_request *preq = pcrypt_padata_request(padata);	struct aead_request *req = pcrypt_request_ctx(preq); 	aead_request_complete(req->base.data, padata->info);} static void pcrypt_aead_giv_serial(struct padata_priv *padata){	struct pcrypt_request *preq = pcrypt_padata_request(padata);	struct aead_givcrypt_request *req = pcrypt_request_ctx(preq); 	aead_request_complete(req->areq.base.data, padata->info);} static void pcrypt_aead_done(struct crypto_async_request *areq, int err){	struct aead_request *req = areq->data;	struct pcrypt_request *preq = aead_request_ctx(req);	struct padata_priv *padata = pcrypt_request_padata(preq); 	padata->info = err;	req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; 	padata_do_serial(padata);} static void pcrypt_aead_enc(struct padata_priv *padata){	struct pcrypt_request *preq = pcrypt_padata_request(padata);	struct aead_request *req = pcrypt_request_ctx(preq); 	padata->info = crypto_aead_encrypt(req); 	if (padata->info == -EINPROGRESS)		return; 	padata_do_serial(padata);} static int pcrypt_aead_encrypt(struct aead_request *req){	int err;	struct pcrypt_request *preq = aead_request_ctx(req);	struct aead_request *creq = pcrypt_request_ctx(preq);	struct padata_priv *padata = pcrypt_request_padata(preq);	struct crypto_aead *aead = crypto_aead_reqtfm(req);	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);	u32 flags = aead_request_flags(req); 	memset(padata, 0, sizeof(struct padata_priv)); 	padata->parallel = pcrypt_aead_enc;	padata->serial = pcrypt_aead_serial; 	aead_request_set_tfm(creq, ctx->child);	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,				  pcrypt_aead_done, req);	aead_request_set_crypt(creq, req->src, req->dst,			       req->cryptlen, req->iv);	aead_request_set_assoc(creq, req->assoc, req->assoclen); 	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);	if (err)		return err;	else		err = crypto_aead_encrypt(creq); 	return err;} static void pcrypt_aead_dec(struct padata_priv *padata){	struct pcrypt_request *preq = pcrypt_padata_request(padata);	struct aead_request *req = pcrypt_request_ctx(preq); 	padata->info = crypto_aead_decrypt(req); 	if (padata->info == -EINPROGRESS)		return; 	padata_do_serial(padata);} static int pcrypt_aead_decrypt(struct aead_request *req){	int err;	struct pcrypt_request *preq = aead_request_ctx(req);	struct aead_request *creq = pcrypt_request_ctx(preq);	struct padata_priv *padata = pcrypt_request_padata(preq);	struct crypto_aead *aead = crypto_aead_reqtfm(req);	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);	u32 flags = aead_request_flags(req); 	memset(padata, 0, sizeof(struct padata_priv)); 	padata->parallel = pcrypt_aead_dec;	padata->serial = pcrypt_aead_serial; 	aead_request_set_tfm(creq, ctx->child);	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,				  pcrypt_aead_done, req);	aead_request_set_crypt(creq, req->src, req->dst,			       req->cryptlen, req->iv);	aead_request_set_assoc(creq, req->assoc, req->assoclen); 	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_dec_padata);	if (err)		return err;	else		err = crypto_aead_decrypt(creq); 	return err;} static void pcrypt_aead_givenc(struct padata_priv *padata){	struct pcrypt_request *preq = pcrypt_padata_request(padata);	struct aead_givcrypt_request *req = pcrypt_request_ctx(preq); 	padata->info = crypto_aead_givencrypt(req); 	if (padata->info == -EINPROGRESS)		return; 	padata_do_serial(padata);} static int pcrypt_aead_givencrypt(struct aead_givcrypt_request *req){	int err;	struct aead_request *areq = &req->areq;	struct pcrypt_request *preq = aead_request_ctx(areq);	struct aead_givcrypt_request *creq = pcrypt_request_ctx(preq);	struct padata_priv *padata = pcrypt_request_padata(preq);	struct crypto_aead *aead = aead_givcrypt_reqtfm(req);	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);	u32 flags = aead_request_flags(areq); 	memset(padata, 0, sizeof(struct padata_priv)); 	padata->parallel = pcrypt_aead_givenc;	padata->serial = pcrypt_aead_giv_serial; 	aead_givcrypt_set_tfm(creq, ctx->child);	aead_givcrypt_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,				   pcrypt_aead_done, areq);	aead_givcrypt_set_crypt(creq, areq->src, areq->dst,				areq->cryptlen, areq->iv);	aead_givcrypt_set_assoc(creq, areq->assoc, areq->assoclen);	aead_givcrypt_set_giv(creq, req->giv, req->seq); 	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);	if (err)		return err;	else		err = crypto_aead_givencrypt(creq); 	return err;} static int pcrypt_aead_init_tfm(struct crypto_tfm *tfm){	int cpu, cpu_index;	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);	struct pcrypt_instance_ctx *ictx = crypto_instance_ctx(inst);	struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm);	struct crypto_aead *cipher; 	ictx->tfm_count++; 	cpu_index = ictx->tfm_count % cpumask_weight(cpu_active_mask); 	ctx->cb_cpu = cpumask_first(cpu_active_mask);	for (cpu = 0; cpu < cpu_index; cpu++)		ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_active_mask); 	cipher = crypto_spawn_aead(crypto_instance_ctx(inst)); 	if (IS_ERR(cipher))		return PTR_ERR(cipher); 	ctx->child = cipher;	tfm->crt_aead.reqsize = sizeof(struct pcrypt_request)		+ sizeof(struct aead_givcrypt_request)		+ crypto_aead_reqsize(cipher); 	return 0;} static void pcrypt_aead_exit_tfm(struct crypto_tfm *tfm){	struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm); 	crypto_free_aead(ctx->child);} static struct crypto_instance *pcrypt_alloc_instance(struct crypto_alg *alg){	struct crypto_instance *inst;	struct pcrypt_instance_ctx *ctx;	int err; 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);	if (!inst) {		inst = ERR_PTR(-ENOMEM);		goto out;	} 	err = -ENAMETOOLONG;	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,		     "pcrypt(%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); 	ctx = crypto_instance_ctx(inst);	err = crypto_init_spawn(&ctx->spawn, alg, inst,				CRYPTO_ALG_TYPE_MASK);	if (err)		goto out_free_inst; 	inst->alg.cra_priority = alg->cra_priority + 100;	inst->alg.cra_blocksize = alg->cra_blocksize;	inst->alg.cra_alignmask = alg->cra_alignmask; out:	return inst; out_free_inst:	kfree(inst);	inst = ERR_PTR(err);	goto out;} static struct crypto_instance *pcrypt_alloc_aead(struct rtattr **tb,						 u32 type, u32 mask){	struct crypto_instance *inst;	struct crypto_alg *alg; 	alg = crypto_get_attr_alg(tb, type, (mask & CRYPTO_ALG_TYPE_MASK));	if (IS_ERR(alg))		return ERR_CAST(alg); 	inst = pcrypt_alloc_instance(alg);	if (IS_ERR(inst))		goto out_put_alg; 	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;	inst->alg.cra_type = &crypto_aead_type; 	inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;	inst->alg.cra_aead.geniv = alg->cra_aead.geniv;	inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize; 	inst->alg.cra_ctxsize = sizeof(struct pcrypt_aead_ctx); 	inst->alg.cra_init = pcrypt_aead_init_tfm;	inst->alg.cra_exit = pcrypt_aead_exit_tfm; 	inst->alg.cra_aead.setkey = pcrypt_aead_setkey;	inst->alg.cra_aead.setauthsize = pcrypt_aead_setauthsize;	inst->alg.cra_aead.encrypt = pcrypt_aead_encrypt;	inst->alg.cra_aead.decrypt = pcrypt_aead_decrypt;	inst->alg.cra_aead.givencrypt = pcrypt_aead_givencrypt; out_put_alg:	crypto_mod_put(alg);	return inst;} static struct crypto_instance *pcrypt_alloc(struct rtattr **tb){	struct crypto_attr_type *algt; 	algt = crypto_get_attr_type(tb);	if (IS_ERR(algt))		return ERR_CAST(algt); 	switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {	case CRYPTO_ALG_TYPE_AEAD:		return pcrypt_alloc_aead(tb, algt->type, algt->mask);	} 	return ERR_PTR(-EINVAL);} static void pcrypt_free(struct crypto_instance *inst){	struct pcrypt_instance_ctx *ctx = crypto_instance_ctx(inst); 	crypto_drop_spawn(&ctx->spawn);	kfree(inst);} static struct crypto_template pcrypt_tmpl = {	.name = "pcrypt",	.alloc = pcrypt_alloc,	.free = pcrypt_free,	.module = THIS_MODULE,}; static int __init pcrypt_init(void){	encwq = create_workqueue("pencrypt");	if (!encwq)		goto err; 	decwq = create_workqueue("pdecrypt");	if (!decwq)		goto err_destroy_encwq;  	pcrypt_enc_padata = padata_alloc(cpu_possible_mask, encwq);	if (!pcrypt_enc_padata)		goto err_destroy_decwq; 	pcrypt_dec_padata = padata_alloc(cpu_possible_mask, decwq);	if (!pcrypt_dec_padata)		goto err_free_padata; 	padata_start(pcrypt_enc_padata);	padata_start(pcrypt_dec_padata); 	return crypto_register_template(&pcrypt_tmpl); err_free_padata:	padata_free(pcrypt_enc_padata); err_destroy_decwq:	destroy_workqueue(decwq); err_destroy_encwq:	destroy_workqueue(encwq); err:	return -ENOMEM;} static void __exit pcrypt_exit(void){	padata_stop(pcrypt_enc_padata);	padata_stop(pcrypt_dec_padata); 	destroy_workqueue(encwq);	destroy_workqueue(decwq); 	padata_free(pcrypt_enc_padata);	padata_free(pcrypt_dec_padata); 	crypto_unregister_template(&pcrypt_tmpl);} module_init(pcrypt_init);module_exit(pcrypt_exit); MODULE_LICENSE("GPL");MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");MODULE_DESCRIPTION("Parallel crypto wrapper");