From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/crypto/pcrypt.c | 243 ++++++++++--------------------------------------
1 files changed, 50 insertions(+), 193 deletions(-)
diff --git a/kernel/crypto/pcrypt.c b/kernel/crypto/pcrypt.c
index 62e1183..9d10b84 100644
--- a/kernel/crypto/pcrypt.c
+++ b/kernel/crypto/pcrypt.c
@@ -1,21 +1,9 @@
+// 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>
- *
- * 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>
@@ -25,43 +13,18 @@
#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>
-struct padata_pcrypt {
- 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 padata_pcrypt pencrypt;
-static struct padata_pcrypt pdecrypt;
+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;
};
@@ -70,33 +33,10 @@
unsigned int cb_cpu;
};
-static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,
- struct padata_pcrypt *pcrypt)
+static inline struct pcrypt_instance_ctx *pcrypt_tfm_ictx(
+ struct crypto_aead *tfm)
{
- unsigned int cpu_index, cpu, i;
- struct pcrypt_cpumask *cpumask;
-
- cpu = *cb_cpu;
-
- rcu_read_lock_bh();
- cpumask = rcu_dereference_bh(pcrypt->cb_cpumask);
- if (cpumask_test_cpu(cpu, cpumask->mask))
- goto out;
-
- if (!cpumask_weight(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);
+ return aead_instance_ctx(aead_alg_instance(tfm));
}
static int pcrypt_aead_setkey(struct crypto_aead *parent,
@@ -158,6 +98,9 @@
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));
@@ -171,7 +114,7 @@
req->cryptlen, req->iv);
aead_request_set_ad(creq, req->assoclen);
- err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt);
+ err = padata_do_parallel(ictx->psenc, padata, &ctx->cb_cpu);
if (!err)
return -EINPROGRESS;
@@ -202,6 +145,9 @@
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));
@@ -215,7 +161,7 @@
req->cryptlen, req->iv);
aead_request_set_ad(creq, req->assoclen);
- err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pdecrypt);
+ err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu);
if (!err)
return -EINPROGRESS;
@@ -262,6 +208,8 @@
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);
}
@@ -282,40 +230,40 @@
}
static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
- u32 type, u32 mask)
+ struct crypto_attr_type *algt)
{
struct pcrypt_instance_ctx *ctx;
- struct crypto_attr_type *algt;
struct aead_instance *inst;
struct aead_alg *alg;
- const char *name;
+ u32 mask = crypto_algt_inherited_mask(algt);
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;
- ctx = aead_instance_ctx(inst);
- crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst));
+ err = -ENOMEM;
- err = crypto_grab_aead(&ctx->spawn, name, 0, 0);
+ 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 out_free_inst;
+ goto err_free_inst;
alg = crypto_spawn_aead_alg(&ctx->spawn);
err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
if (err)
- goto out_drop_aead;
+ goto err_free_inst;
- inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC;
+ inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC;
inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
@@ -333,17 +281,11 @@
inst->free = pcrypt_free;
err = aead_register_instance(tmpl, inst);
- if (err)
- goto out_drop_aead;
-
-out:
+ if (err) {
+err_free_inst:
+ pcrypt_free(inst);
+ }
return err;
-
-out_drop_aead:
- crypto_drop_aead(&ctx->spawn);
-out_free_inst:
- kfree(inst);
- goto out;
}
static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
@@ -356,40 +298,10 @@
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 pcrypt_create_aead(tmpl, tb, algt);
}
return -EINVAL;
-}
-
-static int pcrypt_cpumask_change_notify(struct notifier_block *self,
- unsigned long val, void *data)
-{
- struct padata_pcrypt *pcrypt;
- struct pcrypt_cpumask *new_mask, *old_mask;
- struct padata_cpumask *cpumask = (struct padata_cpumask *)data;
-
- if (!(val & PADATA_CPU_SERIAL))
- return 0;
-
- pcrypt = container_of(self, struct padata_pcrypt, 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;
-
- cpumask_copy(new_mask->mask, cpumask->cbcpu);
- 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_sysfs_add(struct padata_instance *pinst, const char *name)
@@ -404,71 +316,19 @@
return ret;
}
-static int pcrypt_init_padata(struct padata_pcrypt *pcrypt,
- const char *name)
+static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)
{
int ret = -ENOMEM;
- struct pcrypt_cpumask *mask;
- get_online_cpus();
+ *pinst = padata_alloc(name);
+ if (!*pinst)
+ return ret;
- pcrypt->wq = alloc_workqueue("%s", WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE,
- 1, name);
- if (!pcrypt->wq)
- goto err;
-
- pcrypt->pinst = padata_alloc_possible(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;
- }
-
- cpumask_and(mask->mask, cpu_possible_mask, cpu_online_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);
+ ret = pcrypt_sysfs_add(*pinst, name);
if (ret)
- goto err_free_cpumask;
-
- ret = pcrypt_sysfs_add(pcrypt->pinst, name);
- if (ret)
- goto err_unregister_notifier;
-
- put_online_cpus();
+ padata_free(*pinst);
return ret;
-
-err_unregister_notifier:
- padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
-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:
- put_online_cpus();
-
- return ret;
-}
-
-static void pcrypt_fini_padata(struct padata_pcrypt *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 = {
@@ -493,13 +353,10 @@
if (err)
goto err_deinit_pencrypt;
- padata_start(pencrypt.pinst);
- padata_start(pdecrypt.pinst);
-
return crypto_register_template(&pcrypt_tmpl);
err_deinit_pencrypt:
- pcrypt_fini_padata(&pencrypt);
+ padata_free(pencrypt);
err_unreg_kset:
kset_unregister(pcrypt_kset);
err:
@@ -510,13 +367,13 @@
{
crypto_unregister_template(&pcrypt_tmpl);
- pcrypt_fini_padata(&pencrypt);
- pcrypt_fini_padata(&pdecrypt);
+ padata_free(pencrypt);
+ padata_free(pdecrypt);
kset_unregister(pcrypt_kset);
}
-module_init(pcrypt_init);
+subsys_initcall(pcrypt_init);
module_exit(pcrypt_exit);
MODULE_LICENSE("GPL");
--
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