158 lines
3.3 KiB
C
158 lines
3.3 KiB
C
/*
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* Create default crypto algorithm instances.
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*
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/crypto.h>
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#include <linux/ctype.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/rtnetlink.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/workqueue.h>
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#include "internal.h"
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struct cryptomgr_param {
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struct work_struct work;
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struct {
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struct rtattr attr;
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struct crypto_attr_alg data;
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} alg;
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struct {
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u32 type;
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u32 mask;
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char name[CRYPTO_MAX_ALG_NAME];
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} larval;
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char template[CRYPTO_MAX_ALG_NAME];
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};
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static void cryptomgr_probe(struct work_struct *work)
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{
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struct cryptomgr_param *param =
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container_of(work, struct cryptomgr_param, work);
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struct crypto_template *tmpl;
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struct crypto_instance *inst;
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int err;
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tmpl = crypto_lookup_template(param->template);
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if (!tmpl)
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goto err;
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do {
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inst = tmpl->alloc(¶m->alg, sizeof(param->alg));
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if (IS_ERR(inst))
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err = PTR_ERR(inst);
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else if ((err = crypto_register_instance(tmpl, inst)))
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tmpl->free(inst);
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} while (err == -EAGAIN && !signal_pending(current));
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crypto_tmpl_put(tmpl);
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if (err)
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goto err;
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out:
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kfree(param);
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return;
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err:
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crypto_larval_error(param->larval.name, param->larval.type,
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param->larval.mask);
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goto out;
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}
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static int cryptomgr_schedule_probe(struct crypto_larval *larval)
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{
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struct cryptomgr_param *param;
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const char *name = larval->alg.cra_name;
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const char *p;
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unsigned int len;
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param = kmalloc(sizeof(*param), GFP_KERNEL);
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if (!param)
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goto err;
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for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
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;
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len = p - name;
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if (!len || *p != '(')
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goto err_free_param;
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memcpy(param->template, name, len);
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param->template[len] = 0;
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name = p + 1;
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for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
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;
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len = p - name;
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if (!len || *p != ')' || p[1])
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goto err_free_param;
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param->alg.attr.rta_len = sizeof(param->alg);
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param->alg.attr.rta_type = CRYPTOA_ALG;
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memcpy(param->alg.data.name, name, len);
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param->alg.data.name[len] = 0;
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memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
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param->larval.type = larval->alg.cra_flags;
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param->larval.mask = larval->mask;
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INIT_WORK(¶m->work, cryptomgr_probe);
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schedule_work(¶m->work);
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return NOTIFY_STOP;
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err_free_param:
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kfree(param);
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err:
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return NOTIFY_OK;
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}
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static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
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void *data)
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{
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switch (msg) {
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case CRYPTO_MSG_ALG_REQUEST:
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return cryptomgr_schedule_probe(data);
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block cryptomgr_notifier = {
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.notifier_call = cryptomgr_notify,
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};
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static int __init cryptomgr_init(void)
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{
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return crypto_register_notifier(&cryptomgr_notifier);
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}
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static void __exit cryptomgr_exit(void)
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{
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int err = crypto_unregister_notifier(&cryptomgr_notifier);
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BUG_ON(err);
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}
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module_init(cryptomgr_init);
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module_exit(cryptomgr_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Crypto Algorithm Manager");
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