| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * pcrypt - Parallel crypto wrapper. |
| * |
| * Copyright (C) 2009 secunet Security Networks AG |
| * Copyright (C) 2009 Steffen Klassert <steffen.klassert@secunet.com> |
| */ |
| |
| #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/notifier.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; |
| |
| 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; |
| |
| 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, |
| u32 type, u32 mask) |
| { |
| struct pcrypt_instance_ctx *ctx; |
| struct crypto_attr_type *algt; |
| struct aead_instance *inst; |
| struct aead_alg *alg; |
| const char *name; |
| int err; |
| |
| algt = crypto_get_attr_type(tb); |
| if (IS_ERR(algt)) |
| return PTR_ERR(algt); |
| |
| name = crypto_attr_alg_name(tb[1]); |
| if (IS_ERR(name)) |
| return PTR_ERR(name); |
| |
| 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 out_free_inst; |
| |
| ctx->psdec = padata_alloc_shell(pdecrypt); |
| if (!ctx->psdec) |
| goto out_free_psenc; |
| |
| crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst)); |
| |
| err = crypto_grab_aead(&ctx->spawn, name, 0, 0); |
| if (err) |
| goto out_free_psdec; |
| |
| alg = crypto_spawn_aead_alg(&ctx->spawn); |
| err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base); |
| if (err) |
| goto out_drop_aead; |
| |
| 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) |
| goto out_drop_aead; |
| |
| out: |
| return err; |
| |
| out_drop_aead: |
| crypto_drop_aead(&ctx->spawn); |
| out_free_psdec: |
| padata_free_shell(ctx->psdec); |
| out_free_psenc: |
| padata_free_shell(ctx->psenc); |
| out_free_inst: |
| kfree(inst); |
| goto out; |
| } |
| |
| 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->type, algt->mask); |
| } |
| |
| 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_possible(name); |
| if (!*pinst) |
| return ret; |
| |
| ret = pcrypt_sysfs_add(*pinst, name); |
| if (ret) |
| padata_free(*pinst); |
| |
| return ret; |
| } |
| |
| static void pcrypt_fini_padata(struct padata_instance *pinst) |
| { |
| padata_stop(pinst); |
| padata_free(pinst); |
| } |
| |
| 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; |
| |
| padata_start(pencrypt); |
| padata_start(pdecrypt); |
| |
| return crypto_register_template(&pcrypt_tmpl); |
| |
| err_deinit_pencrypt: |
| pcrypt_fini_padata(pencrypt); |
| err_unreg_kset: |
| kset_unregister(pcrypt_kset); |
| err: |
| return err; |
| } |
| |
| static void __exit pcrypt_exit(void) |
| { |
| crypto_unregister_template(&pcrypt_tmpl); |
| |
| pcrypt_fini_padata(pencrypt); |
| pcrypt_fini_padata(pdecrypt); |
| |
| kset_unregister(pcrypt_kset); |
| } |
| |
| subsys_initcall(pcrypt_init); |
| module_exit(pcrypt_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); |
| MODULE_DESCRIPTION("Parallel crypto wrapper"); |
| MODULE_ALIAS_CRYPTO("pcrypt"); |