This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / crypto / cryptomgr.c

diff --git a/crypto/cryptomgr.c b/crypto/cryptomgr.c
new file mode 100644 (file)
index 0000000..2ebffb8
--- /dev/null
+++ b/crypto/cryptomgr.c
@@ -0,0 +1,157 @@
+/*
+ * 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 <linux/crypto.h>
+#include <linux/ctype.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/rtnetlink.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/workqueue.h>
+
+#include "internal.h"
+
+struct cryptomgr_param {
+       struct work_struct work;
+
+       struct {
+               struct rtattr attr;
+               struct crypto_attr_alg data;
+       } alg;
+
+       struct {
+               u32 type;
+               u32 mask;
+               char name[CRYPTO_MAX_ALG_NAME];
+       } larval;
+
+       char template[CRYPTO_MAX_ALG_NAME];
+};
+
+static void cryptomgr_probe(struct work_struct *work)
+{
+       struct cryptomgr_param *param =
+               container_of(work, struct cryptomgr_param, work);
+       struct crypto_template *tmpl;
+       struct crypto_instance *inst;
+       int err;
+
+       tmpl = crypto_lookup_template(param->template);
+       if (!tmpl)
+               goto err;
+
+       do {
+               inst = tmpl->alloc(&param->alg, sizeof(param->alg));
+               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);
+       return;
+
+err:
+       crypto_larval_error(param->larval.name, param->larval.type,
+                           param->larval.mask);
+       goto out;
+}
+
+static int cryptomgr_schedule_probe(struct crypto_larval *larval)
+{
+       struct cryptomgr_param *param;
+       const char *name = larval->alg.cra_name;
+       const char *p;
+       unsigned int len;
+
+       param = kmalloc(sizeof(*param), GFP_KERNEL);
+       if (!param)
+               goto err;
+
+       for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
+               ;
+
+       len = p - name;
+       if (!len || *p != '(')
+               goto err_free_param;
+
+       memcpy(param->template, name, len);
+       param->template[len] = 0;
+
+       name = p + 1;
+       for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
+               ;
+
+       len = p - name;
+       if (!len || *p != ')' || p[1])
+               goto err_free_param;
+
+       param->alg.attr.rta_len = sizeof(param->alg);
+       param->alg.attr.rta_type = CRYPTOA_ALG;
+       memcpy(param->alg.data.name, name, len);
+       param->alg.data.name[len] = 0;
+
+       memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
+       param->larval.type = larval->alg.cra_flags;
+       param->larval.mask = larval->mask;
+
+       INIT_WORK(&param->work, cryptomgr_probe);
+       schedule_work(&param->work);
+
+       return NOTIFY_STOP;
+
+err_free_param:
+       kfree(param);
+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);
+       }
+
+       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);
+}
+
+module_init(cryptomgr_init);
+module_exit(cryptomgr_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Crypto Algorithm Manager");