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[CRYPTO] api: Added spawns

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Spawns lock a specific crypto algorithm in place.  They can then be used
with crypto_spawn_tfm to allocate a tfm for that algorithm.  When the base
algorithm of a spawn is deregistered, all its spawns will be automatically
removed.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2006-09-21 11:39:29 +10:00
parent 492e2b63eb
commit 6bfd48096f
6 changed files with 280 additions and 53 deletions
Download patch file Download diff file Expand all files Collapse all files

95
crypto/api.c
View file

@ -15,11 +15,13 @@
*
*/
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/module.h>
#include <linux/param.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "internal.h"
@ -38,12 +40,6 @@ static inline struct crypto_alg *crypto_alg_get(struct crypto_alg *alg)
return alg;
}
static inline void crypto_alg_put(struct crypto_alg *alg)
{
if (atomic_dec_and_test(&alg->cra_refcnt) && alg->cra_destroy)
alg->cra_destroy(alg);
}
struct crypto_alg *crypto_mod_get(struct crypto_alg *alg)
{
return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
@ -65,6 +61,9 @@ struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask)
list_for_each_entry(q, &crypto_alg_list, cra_list) {
int exact, fuzzy;
if (crypto_is_moribund(q))
continue;
if ((q->cra_flags ^ type) & mask)
continue;
@ -111,7 +110,7 @@ static struct crypto_alg *crypto_larval_alloc(const char *name, u32 type,
larval = kzalloc(sizeof(*larval), GFP_KERNEL);
if (!larval)
return NULL;
return ERR_PTR(-ENOMEM);
larval->mask = mask;
larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type;
@ -153,8 +152,11 @@ static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
wait_for_completion_interruptible_timeout(&larval->completion, 60 * HZ);
alg = larval->adult;
if (alg && !crypto_mod_get(alg))
alg = NULL;
if (alg) {
if (!crypto_mod_get(alg))
alg = ERR_PTR(-EAGAIN);
} else
alg = ERR_PTR(-ENOENT);
crypto_mod_put(&larval->alg);
return alg;
@ -165,9 +167,6 @@ static struct crypto_alg *crypto_alg_lookup(const char *name, u32 type,
{
struct crypto_alg *alg;
if (!name)
return NULL;
down_read(&crypto_alg_sem);
alg = __crypto_alg_lookup(name, type, mask);
up_read(&crypto_alg_sem);
@ -181,7 +180,10 @@ struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
struct crypto_alg *larval;
int ok;
mask &= ~CRYPTO_ALG_LARVAL;
if (!name)
return ERR_PTR(-ENOENT);
mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
type &= mask;
alg = try_then_request_module(crypto_alg_lookup(name, type, mask),
@ -190,7 +192,7 @@ struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;
larval = crypto_larval_alloc(name, type, mask);
if (!larval || !crypto_is_larval(larval))
if (IS_ERR(larval) || !crypto_is_larval(larval))
return larval;
ok = crypto_notify(CRYPTO_MSG_ALG_REQUEST, larval);
@ -203,7 +205,7 @@ struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
alg = crypto_larval_wait(larval);
else {
crypto_mod_put(larval);
alg = NULL;
alg = ERR_PTR(-ENOENT);
}
crypto_larval_kill(larval);
return alg;
@ -298,31 +300,40 @@ static unsigned int crypto_ctxsize(struct crypto_alg *alg, int flags)
return len + (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
}
struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags)
void crypto_shoot_alg(struct crypto_alg *alg)
{
down_write(&crypto_alg_sem);
alg->cra_flags |= CRYPTO_ALG_DYING;
up_write(&crypto_alg_sem);
}
EXPORT_SYMBOL_GPL(crypto_shoot_alg);
struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 flags)
{
struct crypto_tfm *tfm = NULL;
struct crypto_alg *alg;
unsigned int tfm_size;
alg = crypto_alg_mod_lookup(name, 0, 0);
if (alg == NULL)
goto out;
int err = -ENOMEM;
tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, flags);
tfm = kzalloc(tfm_size, GFP_KERNEL);
if (tfm == NULL)
goto out_put;
goto out;
tfm->__crt_alg = alg;
if (crypto_init_flags(tfm, flags))
err = crypto_init_flags(tfm, flags);
if (err)
goto out_free_tfm;
if (crypto_init_ops(tfm))
err = crypto_init_ops(tfm);
if (err)
goto out_free_tfm;
if (alg->cra_init && alg->cra_init(tfm))
if (alg->cra_init && (err = alg->cra_init(tfm))) {
if (err == -EAGAIN)
crypto_shoot_alg(alg);
goto cra_init_failed;
}
goto out;
@ -330,12 +341,36 @@ cra_init_failed:
crypto_exit_ops(tfm);
out_free_tfm:
kfree(tfm);
tfm = NULL;
out_put:
crypto_mod_put(alg);
tfm = ERR_PTR(err);
out:
return tfm;
}
EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags)
{
struct crypto_tfm *tfm = NULL;
int err;
do {
struct crypto_alg *alg;
alg = crypto_alg_mod_lookup(name, 0, 0);
err = PTR_ERR(alg);
if (IS_ERR(alg))
continue;
tfm = __crypto_alloc_tfm(alg, flags);
err = 0;
if (IS_ERR(tfm)) {
crypto_mod_put(alg);
err = PTR_ERR(tfm);
tfm = NULL;
}
} while (err == -EAGAIN && !signal_pending(current));
return tfm;
}
void crypto_free_tfm(struct crypto_tfm *tfm)
{
@ -361,7 +396,7 @@ int crypto_alg_available(const char *name, u32 flags)
int ret = 0;
struct crypto_alg *alg = crypto_alg_mod_lookup(name, 0, 0);
if (alg) {
if (!IS_ERR(alg)) {
crypto_mod_put(alg);
ret = 1;
}