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tag: v3.1-rc1
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/*
* Create default crypto algorithm instances.
*
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/

#include <crypto/internal/aead.h>
#include <linux/ctype.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/rtnetlink.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>

#include "internal.h"

struct cryptomgr_param {
struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];

struct {
struct rtattr attr;
struct crypto_attr_type data;
} type;

union {
struct rtattr attr;
struct {
struct rtattr attr;
struct crypto_attr_alg data;
} alg;
struct {
struct rtattr attr;
struct crypto_attr_u32 data;
} nu32;
} attrs[CRYPTO_MAX_ATTRS];

char larval[CRYPTO_MAX_ALG_NAME];
char template[CRYPTO_MAX_ALG_NAME];

u32 otype;
u32 omask;
};

struct crypto_test_param {
char driver[CRYPTO_MAX_ALG_NAME];
char alg[CRYPTO_MAX_ALG_NAME];
u32 type;
};

static int cryptomgr_probe(void *data)
{
struct cryptomgr_param *param = data;
struct crypto_template *tmpl;
struct crypto_instance *inst;
int err;

tmpl = crypto_lookup_template(param->template);
if (!tmpl)
goto err;

do {
if (tmpl->create) {
err = tmpl->create(tmpl, param->tb);
continue;
}

inst = tmpl->alloc(param->tb);
if (IS_ERR(inst))
err = PTR_ERR(inst);
else if ((err = crypto_register_instance(tmpl, inst)))
tmpl->free(inst);
} while (err == -EAGAIN && !signal_pending(current));

crypto_tmpl_put(tmpl);

if (err)
goto err;

out:
kfree(param);
module_put_and_exit(0);

err:
crypto_larval_error(param->larval, param->otype, param->omask);
goto out;
}

static int cryptomgr_schedule_probe(struct crypto_larval *larval)
{
struct task_struct *thread;
struct cryptomgr_param *param;
const char *name = larval->alg.cra_name;
const char *p;
unsigned int len;
int i;

if (!try_module_get(THIS_MODULE))
goto err;

param = kzalloc(sizeof(*param), GFP_KERNEL);
if (!param)
goto err_put_module;

for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
;

len = p - name;
if (!len || *p != '(')
goto err_free_param;

memcpy(param->template, name, len);

i = 0;
for (;;) {
int notnum = 0;

name = ++p;
len = 0;

for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
notnum |= !isdigit(*p);

if (*p == '(') {
int recursion = 0;

for (;;) {
if (!*++p)
goto err_free_param;
if (*p == '(')
recursion++;
else if (*p == ')' && !recursion--)
break;
}

notnum = 1;
p++;
}

len = p - name;
if (!len)
goto err_free_param;

if (notnum) {
param->attrs[i].alg.attr.rta_len =
sizeof(param->attrs[i].alg);
param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
memcpy(param->attrs[i].alg.data.name, name, len);
} else {
param->attrs[i].nu32.attr.rta_len =
sizeof(param->attrs[i].nu32);
param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
param->attrs[i].nu32.data.num =
simple_strtol(name, NULL, 0);
}

param->tb[i + 1] = &param->attrs[i].attr;
i++;

if (i >= CRYPTO_MAX_ATTRS)
goto err_free_param;

if (*p == ')')
break;

if (*p != ',')
goto err_free_param;
}

if (!i)
goto err_free_param;

param->tb[i + 1] = NULL;

param->type.attr.rta_len = sizeof(param->type);
param->type.attr.rta_type = CRYPTOA_TYPE;
param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
param->tb[0] = &param->type.attr;

param->otype = larval->alg.cra_flags;
param->omask = larval->mask;

memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);

thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
if (IS_ERR(thread))
goto err_free_param;

return NOTIFY_STOP;

err_free_param:
kfree(param);
err_put_module:
module_put(THIS_MODULE);
err:
return NOTIFY_OK;
}

static int cryptomgr_test(void *data)
{
struct crypto_test_param *param = data;
u32 type = param->type;
int err = 0;

#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
goto skiptest;
#endif

if (type & CRYPTO_ALG_TESTED)
goto skiptest;

err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);

skiptest:
crypto_alg_tested(param->driver, err);

kfree(param);
module_put_and_exit(0);
}

static int cryptomgr_schedule_test(struct crypto_alg *alg)
{
struct task_struct *thread;
struct crypto_test_param *param;
u32 type;

if (!try_module_get(THIS_MODULE))
goto err;

param = kzalloc(sizeof(*param), GFP_KERNEL);
if (!param)
goto err_put_module;

memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
memcpy(param->alg, alg->cra_name, sizeof(param->alg));
type = alg->cra_flags;

/* This piece of crap needs to disappear into per-type test hooks. */
if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) &&
((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
alg->cra_ablkcipher.ivsize)) ||
(!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) &&
alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize))
type |= CRYPTO_ALG_TESTED;

param->type = type;

thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
if (IS_ERR(thread))
goto err_free_param;

return NOTIFY_STOP;

err_free_param:
kfree(param);
err_put_module:
module_put(THIS_MODULE);
err:
return NOTIFY_OK;
}

static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
void *data)
{
switch (msg) {
case CRYPTO_MSG_ALG_REQUEST:
return cryptomgr_schedule_probe(data);
case CRYPTO_MSG_ALG_REGISTER:
return cryptomgr_schedule_test(data);
}

return NOTIFY_DONE;
}

static struct notifier_block cryptomgr_notifier = {
.notifier_call = cryptomgr_notify,
};

static int __init cryptomgr_init(void)
{
return crypto_register_notifier(&cryptomgr_notifier);
}

static void __exit cryptomgr_exit(void)
{
int err = crypto_unregister_notifier(&cryptomgr_notifier);
BUG_ON(err);
}

subsys_initcall(cryptomgr_init);
module_exit(cryptomgr_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Crypto Algorithm Manager");
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