[CRYPTO] api: Added event notification
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>
diff --git a/crypto/algapi.c b/crypto/algapi.c
index 232b37d..f0df85f 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -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 @@
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 @@
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 @@
}
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 @@
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 @@
}
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();