// SPDX-License-Identifier: GPL-2.0-or-later/* * Shared crypto simd helpers * * Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi> * Copyright (c) 2016 Herbert Xu <herbert@gondor.apana.org.au> * Copyright (c) 2019 Google LLC * * Based on aesni-intel_glue.c by: *  Copyright (C) 2008, Intel Corp. *    Author: Huang Ying <ying.huang@intel.com> */ /* * Shared crypto SIMD helpers.  These functions dynamically create and register * an AEAD algorithm that wraps another, internal algorithm.  The wrapper * ensures that the internal algorithm is only executed in a context where SIMD * instructions are usable, i.e. where may_use_simd() returns true.  If SIMD is * already usable, the wrapper directly calls the internal algorithm.  Otherwise * it defers execution to a workqueue via cryptd. * * This is an alternative to the internal algorithm implementing a fallback for * the !may_use_simd() case itself. * * Note that the wrapper algorithm is asynchronous, i.e. it has the * CRYPTO_ALG_ASYNC flag set.  Therefore it won't be found by users who * explicitly allocate a synchronous algorithm. */ #include <crypto/cryptd.h>#include <crypto/internal/aead.h>#include <crypto/internal/simd.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/preempt.h>#include <asm/simd.h> struct simd_aead_alg {	const char *ialg_name;	struct aead_alg alg;}; struct simd_aead_ctx {	struct cryptd_aead *cryptd_tfm;}; static int simd_aead_setkey(struct crypto_aead *tfm, const u8 *key,				unsigned int key_len){	struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);	struct crypto_aead *child = &ctx->cryptd_tfm->base; 	crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);	crypto_aead_set_flags(child, crypto_aead_get_flags(tfm) &				     CRYPTO_TFM_REQ_MASK);	return crypto_aead_setkey(child, key, key_len);} static int simd_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize){	struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);	struct crypto_aead *child = &ctx->cryptd_tfm->base; 	return crypto_aead_setauthsize(child, authsize);} static int simd_aead_encrypt(struct aead_request *req){	struct crypto_aead *tfm = crypto_aead_reqtfm(req);	struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);	struct aead_request *subreq;	struct crypto_aead *child; 	subreq = aead_request_ctx(req);	*subreq = *req; 	if (!crypto_simd_usable() ||	    (in_atomic() && cryptd_aead_queued(ctx->cryptd_tfm)))		child = &ctx->cryptd_tfm->base;	else		child = cryptd_aead_child(ctx->cryptd_tfm); 	aead_request_set_tfm(subreq, child); 	return crypto_aead_encrypt(subreq);} static int simd_aead_decrypt(struct aead_request *req){	struct crypto_aead *tfm = crypto_aead_reqtfm(req);	struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);	struct aead_request *subreq;	struct crypto_aead *child; 	subreq = aead_request_ctx(req);	*subreq = *req; 	if (!crypto_simd_usable() ||	    (in_atomic() && cryptd_aead_queued(ctx->cryptd_tfm)))		child = &ctx->cryptd_tfm->base;	else		child = cryptd_aead_child(ctx->cryptd_tfm); 	aead_request_set_tfm(subreq, child); 	return crypto_aead_decrypt(subreq);} static void simd_aead_exit(struct crypto_aead *tfm){	struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm); 	cryptd_free_aead(ctx->cryptd_tfm);} static int simd_aead_init(struct crypto_aead *tfm){	struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);	struct cryptd_aead *cryptd_tfm;	struct simd_aead_alg *salg;	struct aead_alg *alg;	unsigned reqsize; 	alg = crypto_aead_alg(tfm);	salg = container_of(alg, struct simd_aead_alg, alg); 	cryptd_tfm = cryptd_alloc_aead(salg->ialg_name, CRYPTO_ALG_INTERNAL,				       CRYPTO_ALG_INTERNAL);	if (IS_ERR(cryptd_tfm))		return PTR_ERR(cryptd_tfm); 	ctx->cryptd_tfm = cryptd_tfm; 	reqsize = max(crypto_aead_reqsize(cryptd_aead_child(cryptd_tfm)),		      crypto_aead_reqsize(&cryptd_tfm->base));	reqsize += sizeof(struct aead_request); 	crypto_aead_set_reqsize(tfm, reqsize); 	return 0;} static struct simd_aead_alg *simd_aead_create_compat(struct aead_alg *ialg,						     const char *algname,						     const char *drvname,						     const char *basename){	struct simd_aead_alg *salg;	struct aead_alg *alg;	int err; 	salg = kzalloc_obj(*salg);	if (!salg) {		salg = ERR_PTR(-ENOMEM);		goto out;	} 	salg->ialg_name = basename;	alg = &salg->alg; 	err = -ENAMETOOLONG;	if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=	    CRYPTO_MAX_ALG_NAME)		goto out_free_salg; 	if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",		     drvname) >= CRYPTO_MAX_ALG_NAME)		goto out_free_salg; 	alg->base.cra_flags = CRYPTO_ALG_ASYNC |		(ialg->base.cra_flags & CRYPTO_ALG_INHERITED_FLAGS);	alg->base.cra_priority = ialg->base.cra_priority;	alg->base.cra_blocksize = ialg->base.cra_blocksize;	alg->base.cra_alignmask = ialg->base.cra_alignmask;	alg->base.cra_module = ialg->base.cra_module;	alg->base.cra_ctxsize = sizeof(struct simd_aead_ctx); 	alg->ivsize = ialg->ivsize;	alg->maxauthsize = ialg->maxauthsize;	alg->chunksize = ialg->chunksize; 	alg->init = simd_aead_init;	alg->exit = simd_aead_exit; 	alg->setkey = simd_aead_setkey;	alg->setauthsize = simd_aead_setauthsize;	alg->encrypt = simd_aead_encrypt;	alg->decrypt = simd_aead_decrypt; 	err = crypto_register_aead(alg);	if (err)		goto out_free_salg; out:	return salg; out_free_salg:	kfree(salg);	salg = ERR_PTR(err);	goto out;} static void simd_aead_free(struct simd_aead_alg *salg){	crypto_unregister_aead(&salg->alg);	kfree(salg);} int simd_register_aeads_compat(struct aead_alg *algs, int count,			       struct simd_aead_alg **simd_algs){	int err;	int i;	const char *algname;	const char *drvname;	const char *basename;	struct simd_aead_alg *simd; 	for (i = 0; i < count; i++) {		if (WARN_ON(strncmp(algs[i].base.cra_name, "__", 2) ||			    strncmp(algs[i].base.cra_driver_name, "__", 2)))			return -EINVAL;	} 	err = crypto_register_aeads(algs, count);	if (err)		return err; 	for (i = 0; i < count; i++) {		algname = algs[i].base.cra_name + 2;		drvname = algs[i].base.cra_driver_name + 2;		basename = algs[i].base.cra_driver_name;		simd = simd_aead_create_compat(algs + i, algname, drvname, basename);		err = PTR_ERR(simd);		if (IS_ERR(simd))			goto err_unregister;		simd_algs[i] = simd;	}	return 0; err_unregister:	simd_unregister_aeads(algs, count, simd_algs);	return err;}EXPORT_SYMBOL_GPL(simd_register_aeads_compat); void simd_unregister_aeads(struct aead_alg *algs, int count,			   struct simd_aead_alg **simd_algs){	int i; 	crypto_unregister_aeads(algs, count); 	for (i = 0; i < count; i++) {		if (simd_algs[i]) {			simd_aead_free(simd_algs[i]);			simd_algs[i] = NULL;		}	}}EXPORT_SYMBOL_GPL(simd_unregister_aeads); MODULE_DESCRIPTION("Shared crypto SIMD helpers");MODULE_LICENSE("GPL");