/* * 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");