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[CRYPTO] api: Added event notification

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This patch adds a notifier chain for algorithm/template registration events.
This will be used to register compound algorithms such as cbc(aes).  In
future this will also be passed onto user-space through netlink.

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 2006-08-06 21:23:26 +10:00
parent 4cc7720cd1
commit 2825982d9d
4 changed files with 199 additions and 14 deletions
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50
crypto/algapi.c
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@ -21,6 +21,24 @@
static LIST_HEAD(crypto_template_list);
void crypto_larval_error(const char *name)
{
struct crypto_alg *alg;
down_read(&crypto_alg_sem);
alg = __crypto_alg_lookup(name);
up_read(&crypto_alg_sem);
if (alg) {
if (crypto_is_larval(alg)) {
struct crypto_larval *larval = (void *)alg;
complete(&larval->completion);
}
crypto_mod_put(alg);
}
}
EXPORT_SYMBOL_GPL(crypto_larval_error);
static inline int crypto_set_driver_name(struct crypto_alg *alg)
{
static const char suffix[] = "-generic";
@ -60,14 +78,27 @@ static int __crypto_register_alg(struct crypto_alg *alg)
struct crypto_alg *q;
int ret = -EEXIST;
atomic_set(&alg->cra_refcnt, 1);
list_for_each_entry(q, &crypto_alg_list, cra_list) {
if (q == alg)
goto out;
if (crypto_is_larval(q) &&
(!strcmp(alg->cra_name, q->cra_name) ||
!strcmp(alg->cra_driver_name, q->cra_name))) {
struct crypto_larval *larval = (void *)q;
if (!crypto_mod_get(alg))
continue;
larval->adult = alg;
complete(&larval->completion);
}
}
list_add(&alg->cra_list, &crypto_alg_list);
atomic_set(&alg->cra_refcnt, 1);
crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg);
ret = 0;
out:
return ret;
}
@ -97,6 +128,7 @@ int crypto_unregister_alg(struct crypto_alg *alg)
list_del_init(&alg->cra_list);
ret = 0;
}
crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
up_write(&crypto_alg_sem);
if (ret)
@ -123,6 +155,7 @@ int crypto_register_template(struct crypto_template *tmpl)
}
list_add(&tmpl->list, &crypto_template_list);
crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
err = 0;
out:
up_write(&crypto_alg_sem);
@ -145,8 +178,11 @@ void crypto_unregister_template(struct crypto_template *tmpl)
hlist_for_each_entry(inst, p, list, list) {
BUG_ON(list_empty(&inst->alg.cra_list));
list_del_init(&inst->alg.cra_list);
crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
}
crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
up_write(&crypto_alg_sem);
hlist_for_each_entry_safe(inst, p, n, list, list) {
@ -212,6 +248,18 @@ err:
}
EXPORT_SYMBOL_GPL(crypto_register_instance);
int crypto_register_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&crypto_chain, nb);
}
EXPORT_SYMBOL_GPL(crypto_register_notifier);
int crypto_unregister_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&crypto_chain, nb);
}
EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
static int __init crypto_algapi_init(void)
{
crypto_init_proc();