65f27f3844
Pass the work_struct pointer to the work function rather than context data. The work function can use container_of() to work out the data. For the cases where the container of the work_struct may go away the moment the pending bit is cleared, it is made possible to defer the release of the structure by deferring the clearing of the pending bit. To make this work, an extra flag is introduced into the management side of the work_struct. This governs auto-release of the structure upon execution. Ordinarily, the work queue executor would release the work_struct for further scheduling or deallocation by clearing the pending bit prior to jumping to the work function. This means that, unless the driver makes some guarantee itself that the work_struct won't go away, the work function may not access anything else in the work_struct or its container lest they be deallocated.. This is a problem if the auxiliary data is taken away (as done by the last patch). However, if the pending bit is *not* cleared before jumping to the work function, then the work function *may* access the work_struct and its container with no problems. But then the work function must itself release the work_struct by calling work_release(). In most cases, automatic release is fine, so this is the default. Special initiators exist for the non-auto-release case (ending in _NAR). Signed-Off-By: David Howells <dhowells@redhat.com>
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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