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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * pcrypt - Parallel crypto wrapper.
- *
- * Copyright (C) 2009 secunet Security Networks AG
- * Copyright (C) 2009 Steffen Klassert <[email protected]>
- */
- #include <crypto/algapi.h>
- #include <crypto/internal/aead.h>
- #include <linux/atomic.h>
- #include <linux/err.h>
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/slab.h>
- #include <linux/kobject.h>
- #include <linux/cpu.h>
- #include <crypto/pcrypt.h>
- static struct padata_instance *pencrypt;
- static struct padata_instance *pdecrypt;
- static struct kset *pcrypt_kset;
- struct pcrypt_instance_ctx {
- struct crypto_aead_spawn spawn;
- struct padata_shell *psenc;
- struct padata_shell *psdec;
- atomic_t tfm_count;
- };
- struct pcrypt_aead_ctx {
- struct crypto_aead *child;
- unsigned int cb_cpu;
- };
- static inline struct pcrypt_instance_ctx *pcrypt_tfm_ictx(
- struct crypto_aead *tfm)
- {
- return aead_instance_ctx(aead_alg_instance(tfm));
- }
- 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_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;
- 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);
- int ret;
- ret = crypto_aead_encrypt(req);
- if (ret == -EINPROGRESS)
- return;
- padata->info = ret;
- 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);
- struct pcrypt_instance_ctx *ictx;
- ictx = pcrypt_tfm_ictx(aead);
- 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_ad(creq, req->assoclen);
- err = padata_do_parallel(ictx->psenc, padata, &ctx->cb_cpu);
- if (!err)
- return -EINPROGRESS;
- if (err == -EBUSY)
- return -EAGAIN;
- 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);
- int ret;
- ret = crypto_aead_decrypt(req);
- if (ret == -EINPROGRESS)
- return;
- padata->info = ret;
- 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);
- struct pcrypt_instance_ctx *ictx;
- ictx = pcrypt_tfm_ictx(aead);
- 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_ad(creq, req->assoclen);
- err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu);
- if (!err)
- return -EINPROGRESS;
- if (err == -EBUSY)
- return -EAGAIN;
- return err;
- }
- static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
- {
- int cpu, cpu_index;
- struct aead_instance *inst = aead_alg_instance(tfm);
- struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
- struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
- struct crypto_aead *cipher;
- cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
- cpumask_weight(cpu_online_mask);
- ctx->cb_cpu = cpumask_first(cpu_online_mask);
- for (cpu = 0; cpu < cpu_index; cpu++)
- ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
- cipher = crypto_spawn_aead(&ictx->spawn);
- if (IS_ERR(cipher))
- return PTR_ERR(cipher);
- ctx->child = cipher;
- crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
- sizeof(struct aead_request) +
- crypto_aead_reqsize(cipher));
- return 0;
- }
- static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
- {
- struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
- crypto_free_aead(ctx->child);
- }
- static void pcrypt_free(struct aead_instance *inst)
- {
- struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);
- crypto_drop_aead(&ctx->spawn);
- padata_free_shell(ctx->psdec);
- padata_free_shell(ctx->psenc);
- kfree(inst);
- }
- static int pcrypt_init_instance(struct crypto_instance *inst,
- struct crypto_alg *alg)
- {
- if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
- "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
- return -ENAMETOOLONG;
- memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
- inst->alg.cra_priority = alg->cra_priority + 100;
- inst->alg.cra_blocksize = alg->cra_blocksize;
- inst->alg.cra_alignmask = alg->cra_alignmask;
- return 0;
- }
- static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
- struct crypto_attr_type *algt)
- {
- struct pcrypt_instance_ctx *ctx;
- struct aead_instance *inst;
- struct aead_alg *alg;
- u32 mask = crypto_algt_inherited_mask(algt);
- int err;
- inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
- if (!inst)
- return -ENOMEM;
- err = -ENOMEM;
- ctx = aead_instance_ctx(inst);
- ctx->psenc = padata_alloc_shell(pencrypt);
- if (!ctx->psenc)
- goto err_free_inst;
- ctx->psdec = padata_alloc_shell(pdecrypt);
- if (!ctx->psdec)
- goto err_free_inst;
- err = crypto_grab_aead(&ctx->spawn, aead_crypto_instance(inst),
- crypto_attr_alg_name(tb[1]), 0, mask);
- if (err)
- goto err_free_inst;
- alg = crypto_spawn_aead_alg(&ctx->spawn);
- err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
- if (err)
- goto err_free_inst;
- inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC;
- inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
- inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
- inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
- inst->alg.init = pcrypt_aead_init_tfm;
- inst->alg.exit = pcrypt_aead_exit_tfm;
- inst->alg.setkey = pcrypt_aead_setkey;
- inst->alg.setauthsize = pcrypt_aead_setauthsize;
- inst->alg.encrypt = pcrypt_aead_encrypt;
- inst->alg.decrypt = pcrypt_aead_decrypt;
- inst->free = pcrypt_free;
- err = aead_register_instance(tmpl, inst);
- if (err) {
- err_free_inst:
- pcrypt_free(inst);
- }
- return err;
- }
- static int pcrypt_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_AEAD:
- return pcrypt_create_aead(tmpl, tb, algt);
- }
- return -EINVAL;
- }
- static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
- {
- int ret;
- pinst->kobj.kset = pcrypt_kset;
- ret = kobject_add(&pinst->kobj, NULL, "%s", name);
- if (!ret)
- kobject_uevent(&pinst->kobj, KOBJ_ADD);
- return ret;
- }
- static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)
- {
- int ret = -ENOMEM;
- *pinst = padata_alloc(name);
- if (!*pinst)
- return ret;
- ret = pcrypt_sysfs_add(*pinst, name);
- if (ret)
- padata_free(*pinst);
- return ret;
- }
- static struct crypto_template pcrypt_tmpl = {
- .name = "pcrypt",
- .create = pcrypt_create,
- .module = THIS_MODULE,
- };
- static int __init pcrypt_init(void)
- {
- int err = -ENOMEM;
- pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
- if (!pcrypt_kset)
- goto err;
- err = pcrypt_init_padata(&pencrypt, "pencrypt");
- if (err)
- goto err_unreg_kset;
- err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
- if (err)
- goto err_deinit_pencrypt;
- return crypto_register_template(&pcrypt_tmpl);
- err_deinit_pencrypt:
- padata_free(pencrypt);
- err_unreg_kset:
- kset_unregister(pcrypt_kset);
- err:
- return err;
- }
- static void __exit pcrypt_exit(void)
- {
- crypto_unregister_template(&pcrypt_tmpl);
- padata_free(pencrypt);
- padata_free(pdecrypt);
- kset_unregister(pcrypt_kset);
- }
- subsys_initcall(pcrypt_init);
- module_exit(pcrypt_exit);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Steffen Klassert <[email protected]>");
- MODULE_DESCRIPTION("Parallel crypto wrapper");
- MODULE_ALIAS_CRYPTO("pcrypt");
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