diff options
Diffstat (limited to 'crypto/cryptomgr.c')
| -rw-r--r-- | crypto/cryptomgr.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/crypto/cryptomgr.c b/crypto/cryptomgr.c new file mode 100644 index 00000000000..9b5b1560106 --- /dev/null +++ b/crypto/cryptomgr.c @@ -0,0 +1,156 @@ +/* + * 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(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 { + inst = tmpl->alloc(¶m->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(¶m->work, cryptomgr_probe, param); + schedule_work(¶m->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"); |