| /* |
| * 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 <linux/notifier.h> |
| #include <crypto/pcrypt.h> |
| |
| struct pcrypt_instance { |
| struct padata_instance *pinst; |
| struct workqueue_struct *wq; |
| |
| /* |
| * Cpumask for callback CPUs. It should be |
| * equal to serial cpumask of corresponding padata instance, |
| * so it is updated when padata notifies us about serial |
| * cpumask change. |
| * |
| * cb_cpumask is protected by RCU. This fact prevents us from |
| * using cpumask_var_t directly because the actual type of |
| * cpumsak_var_t depends on kernel configuration(particularly on |
| * CONFIG_CPUMASK_OFFSTACK macro). Depending on the configuration |
| * cpumask_var_t may be either a pointer to the struct cpumask |
| * or a variable allocated on the stack. Thus we can not safely use |
| * cpumask_var_t with RCU operations such as rcu_assign_pointer or |
| * rcu_dereference. So cpumask_var_t is wrapped with struct |
| * pcrypt_cpumask which makes possible to use it with RCU. |
| */ |
| struct pcrypt_cpumask { |
| cpumask_var_t mask; |
| } *cb_cpumask; |
| struct notifier_block nblock; |
| }; |
| |
| static struct pcrypt_instance pencrypt; |
| static struct pcrypt_instance pdecrypt; |
| |
| |
| 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 pcrypt_instance *pcrypt) |
| { |
| unsigned int cpu_index, cpu, i; |
| struct pcrypt_cpumask *cpumask; |
| |
| cpu = *cb_cpu; |
| |
| rcu_read_lock_bh(); |
| cpumask = rcu_dereference(pcrypt->cb_cpumask); |
| if (cpumask_test_cpu(cpu, cpumask->mask)) |
| goto out; |
| |
| cpu_index = cpu % cpumask_weight(cpumask->mask); |
| |
| cpu = cpumask_first(cpumask->mask); |
| for (i = 0; i < cpu_index; i++) |
| cpu = cpumask_next(cpu, cpumask->mask); |
| |
| *cb_cpu = cpu; |
| |
| out: |
| rcu_read_unlock_bh(); |
| return padata_do_parallel(pcrypt->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, &pencrypt); |
| 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); |
| |
| 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, &pdecrypt); |
| if (!err) |
| return -EINPROGRESS; |
| |
| 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, &pencrypt); |
| if (!err) |
| return -EINPROGRESS; |
| |
| 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 int pcrypt_cpumask_change_notify(struct notifier_block *self, |
| unsigned long val, void *data) |
| { |
| struct pcrypt_instance *pcrypt; |
| struct pcrypt_cpumask *new_mask, *old_mask; |
| |
| if (!(val & PADATA_CPU_SERIAL)) |
| return 0; |
| |
| pcrypt = container_of(self, struct pcrypt_instance, nblock); |
| new_mask = kmalloc(sizeof(*new_mask), GFP_KERNEL); |
| if (!new_mask) |
| return -ENOMEM; |
| if (!alloc_cpumask_var(&new_mask->mask, GFP_KERNEL)) { |
| kfree(new_mask); |
| return -ENOMEM; |
| } |
| |
| old_mask = pcrypt->cb_cpumask; |
| |
| padata_get_cpumask(pcrypt->pinst, PADATA_CPU_SERIAL, new_mask->mask); |
| rcu_assign_pointer(pcrypt->cb_cpumask, new_mask); |
| synchronize_rcu_bh(); |
| |
| free_cpumask_var(old_mask->mask); |
| kfree(old_mask); |
| return 0; |
| } |
| |
| static int __pcrypt_init_instance(struct pcrypt_instance *pcrypt, |
| const char *name) |
| { |
| int ret = -ENOMEM; |
| struct pcrypt_cpumask *mask; |
| |
| pcrypt->wq = create_workqueue(name); |
| if (!pcrypt->wq) |
| goto err; |
| |
| pcrypt->pinst = padata_alloc(pcrypt->wq); |
| if (!pcrypt->pinst) |
| goto err_destroy_workqueue; |
| |
| mask = kmalloc(sizeof(*mask), GFP_KERNEL); |
| if (!mask) |
| goto err_free_padata; |
| if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) { |
| kfree(mask); |
| goto err_free_padata; |
| } |
| |
| padata_get_cpumask(pcrypt->pinst, PADATA_CPU_SERIAL, mask->mask); |
| rcu_assign_pointer(pcrypt->cb_cpumask, mask); |
| |
| pcrypt->nblock.notifier_call = pcrypt_cpumask_change_notify; |
| ret = padata_register_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock); |
| if (ret) |
| goto err_free_cpumask; |
| |
| return ret; |
| err_free_cpumask: |
| free_cpumask_var(mask->mask); |
| kfree(mask); |
| err_free_padata: |
| padata_free(pcrypt->pinst); |
| err_destroy_workqueue: |
| destroy_workqueue(pcrypt->wq); |
| err: |
| return ret; |
| } |
| |
| static void __pcrypt_deinit_instance(struct pcrypt_instance *pcrypt) |
| { |
| free_cpumask_var(pcrypt->cb_cpumask->mask); |
| kfree(pcrypt->cb_cpumask); |
| |
| padata_stop(pcrypt->pinst); |
| padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock); |
| destroy_workqueue(pcrypt->wq); |
| padata_free(pcrypt->pinst); |
| } |
| |
| static struct crypto_template pcrypt_tmpl = { |
| .name = "pcrypt", |
| .alloc = pcrypt_alloc, |
| .free = pcrypt_free, |
| .module = THIS_MODULE, |
| }; |
| |
| static int __init pcrypt_init(void) |
| { |
| int err; |
| |
| err = __pcrypt_init_instance(&pencrypt, "pencrypt"); |
| if (err) |
| goto err; |
| |
| err = __pcrypt_init_instance(&pdecrypt, "pdecrypt"); |
| if (err) |
| goto err_deinit_pencrypt; |
| |
| padata_start(pencrypt.pinst); |
| padata_start(pdecrypt.pinst); |
| |
| return crypto_register_template(&pcrypt_tmpl); |
| |
| err_deinit_pencrypt: |
| __pcrypt_deinit_instance(&pencrypt); |
| err: |
| return err; |
| } |
| |
| static void __exit pcrypt_exit(void) |
| { |
| __pcrypt_deinit_instance(&pencrypt); |
| __pcrypt_deinit_instance(&pdecrypt); |
| |
| 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"); |